diff --git a/automotive/vehicle/2.0/default/impl/vhal_v2_0/DefaultConfig.h b/automotive/vehicle/2.0/default/impl/vhal_v2_0/DefaultConfig.h
index 80a1831..5ecce46 100644
--- a/automotive/vehicle/2.0/default/impl/vhal_v2_0/DefaultConfig.h
+++ b/automotive/vehicle/2.0/default/impl/vhal_v2_0/DefaultConfig.h
@@ -417,7 +417,7 @@
                          .minSampleRate = 1.0f,
                          .maxSampleRate = 2.0f,
                  },
-         .initialValue = {.floatValues = {100.0f}}},  // units in meters
+         .initialValue = {.floatValues = {50000.0f}}},  // units in meters
 
         {.config =
                  {
diff --git a/camera/provider/2.4/vts/functional/VtsHalCameraProviderV2_4TargetTest.cpp b/camera/provider/2.4/vts/functional/VtsHalCameraProviderV2_4TargetTest.cpp
index aa5c48f..f1f0f18 100644
--- a/camera/provider/2.4/vts/functional/VtsHalCameraProviderV2_4TargetTest.cpp
+++ b/camera/provider/2.4/vts/functional/VtsHalCameraProviderV2_4TargetTest.cpp
@@ -1209,7 +1209,12 @@
             return notify;
         }
 
-        if (physicalCameraMetadata.size() != request->expectedPhysicalResults.size()) {
+        // Physical device results are only expected in the last/final
+        // partial result notification.
+        bool expectPhysicalResults = !(request->usePartialResult &&
+                (results.partialResult < request->numPartialResults));
+        if (expectPhysicalResults &&
+                (physicalCameraMetadata.size() != request->expectedPhysicalResults.size())) {
             ALOGE("%s: Frame %d: Returned physical metadata count %zu "
                     "must be equal to expected count %zu", __func__, frameNumber,
                     physicalCameraMetadata.size(), request->expectedPhysicalResults.size());
diff --git a/compatibility_matrices/compatibility_matrix.current.xml b/compatibility_matrices/compatibility_matrix.current.xml
index 57f390c..ff925d9 100644
--- a/compatibility_matrices/compatibility_matrix.current.xml
+++ b/compatibility_matrices/compatibility_matrix.current.xml
@@ -521,7 +521,7 @@
     </hal>
     <hal format="hidl" optional="true">
         <name>android.hardware.usb.gadget</name>
-        <version>1.0-1</version>
+        <version>1.0-2</version>
         <interface>
             <name>IUsbGadget</name>
             <instance>default</instance>
@@ -534,6 +534,13 @@
             <instance>default</instance>
         </interface>
     </hal>
+    <hal format="aidl" optional="true">
+        <name>android.hardware.vibrator</name>
+        <interface>
+            <name>IVibratorManager</name>
+            <instance>default</instance>
+        </interface>
+    </hal>
     <hal format="hidl" optional="true">
         <name>android.hardware.vr</name>
         <version>1.0</version>
diff --git a/gnss/1.1/default/GnssDebug.cpp b/gnss/1.1/default/GnssDebug.cpp
index 252f4e6..39efcd2 100644
--- a/gnss/1.1/default/GnssDebug.cpp
+++ b/gnss/1.1/default/GnssDebug.cpp
@@ -37,8 +37,8 @@
             .latitudeDegrees = gMockLatitudeDegrees,
             .longitudeDegrees = gMockLongitudeDegrees,
             .altitudeMeters = gMockAltitudeMeters,
-            .speedMetersPerSec = kMockSpeedMetersPerSec,
-            .bearingDegrees = kMockBearingDegrees,
+            .speedMetersPerSec = gMockSpeedMetersPerSec,
+            .bearingDegrees = gMockBearingDegrees,
             .horizontalAccuracyMeters = kMockHorizontalAccuracyMeters,
             .verticalAccuracyMeters = kMockVerticalAccuracyMeters,
             .speedAccuracyMetersPerSecond = kMockSpeedAccuracyMetersPerSecond,
diff --git a/gnss/aidl/TEST_MAPPING b/gnss/aidl/TEST_MAPPING
new file mode 100644
index 0000000..c21c3e4
--- /dev/null
+++ b/gnss/aidl/TEST_MAPPING
@@ -0,0 +1,7 @@
+{
+  "presubmit": [
+    {
+      "name": "VtsHalGnssTargetTest"
+    }
+  ]
+}
diff --git a/gnss/aidl/vts/gnss_hal_test_cases.cpp b/gnss/aidl/vts/gnss_hal_test_cases.cpp
index 2b8a447..d621053 100644
--- a/gnss/aidl/vts/gnss_hal_test_cases.cpp
+++ b/gnss/aidl/vts/gnss_hal_test_cases.cpp
@@ -46,7 +46,7 @@
     ASSERT_TRUE(iGnssPsds != nullptr);
 
     status = iGnssPsds->injectPsdsData(PsdsType::LONG_TERM, std::vector<uint8_t>());
-    ASSERT_TRUE(status.isOk());
+    ASSERT_FALSE(status.isOk());
 }
 
 /*
diff --git a/gnss/common/utils/default/MockLocation.cpp b/gnss/common/utils/default/MockLocation.cpp
index 2d8e7c5..c90075f 100644
--- a/gnss/common/utils/default/MockLocation.cpp
+++ b/gnss/common/utils/default/MockLocation.cpp
@@ -21,5 +21,7 @@
 float gMockLatitudeDegrees{37.4219999};
 float gMockLongitudeDegrees{-122.0840575};
 float gMockAltitudeMeters{1.60062531};
+float gMockBearingDegrees{0};
+float gMockSpeedMetersPerSec{0};
 
 }  // namespace android::hardware::gnss::common
diff --git a/gnss/common/utils/default/Utils.cpp b/gnss/common/utils/default/Utils.cpp
index fa83634..d336f1b 100644
--- a/gnss/common/utils/default/Utils.cpp
+++ b/gnss/common/utils/default/Utils.cpp
@@ -145,8 +145,8 @@
             .latitudeDegrees = gMockLatitudeDegrees,
             .longitudeDegrees = gMockLongitudeDegrees,
             .altitudeMeters = gMockAltitudeMeters,
-            .speedMetersPerSec = kMockSpeedMetersPerSec,
-            .bearingDegrees = kMockBearingDegrees,
+            .speedMetersPerSec = gMockSpeedMetersPerSec,
+            .bearingDegrees = gMockBearingDegrees,
             .horizontalAccuracyMeters = kMockHorizontalAccuracyMeters,
             .verticalAccuracyMeters = kMockVerticalAccuracyMeters,
             .speedAccuracyMetersPerSecond = kMockSpeedAccuracyMetersPerSecond,
diff --git a/gnss/common/utils/default/include/Constants.h b/gnss/common/utils/default/include/Constants.h
index ad4e0eb..a290ed2 100644
--- a/gnss/common/utils/default/include/Constants.h
+++ b/gnss/common/utils/default/include/Constants.h
@@ -24,8 +24,6 @@
 namespace gnss {
 namespace common {
 
-const float kMockSpeedMetersPerSec = 0;
-const float kMockBearingDegrees = 0;
 const float kMockHorizontalAccuracyMeters = 5;
 const float kMockVerticalAccuracyMeters = 5;
 const float kMockSpeedAccuracyMetersPerSecond = 1;
diff --git a/gnss/common/utils/default/include/MockLocation.h b/gnss/common/utils/default/include/MockLocation.h
index cd8cb5d..0bfdd1a 100644
--- a/gnss/common/utils/default/include/MockLocation.h
+++ b/gnss/common/utils/default/include/MockLocation.h
@@ -27,6 +27,8 @@
 extern float gMockLatitudeDegrees;
 extern float gMockLongitudeDegrees;
 extern float gMockAltitudeMeters;
+extern float gMockBearingDegrees;
+extern float gMockSpeedMetersPerSec;
 
 }  // namespace common
 }  // namespace gnss
diff --git a/gnss/common/utils/default/include/v2_1/GnssTemplate.h b/gnss/common/utils/default/include/v2_1/GnssTemplate.h
index cbf3933..4d1baa7 100644
--- a/gnss/common/utils/default/include/v2_1/GnssTemplate.h
+++ b/gnss/common/utils/default/include/v2_1/GnssTemplate.h
@@ -651,6 +651,8 @@
     auto lat = gMockLatitudeDegrees;
     auto lon = gMockLongitudeDegrees;
     auto ele = gMockAltitudeMeters;
+    auto bea = gMockBearingDegrees;
+    auto spd = gMockSpeedMetersPerSec;
 
     for (size_t i = 1; i < options.size(); ++i) {
         std::string option = options[i];
@@ -663,6 +665,12 @@
         } else if (option.rfind("ele=", 0) == 0) {
             option = option.substr(4);
             ele = stof(option);
+        } else if (option.rfind("bea=", 0) == 0) {
+            option = option.substr(4);
+            bea = stof(option);
+        } else if (option.rfind("spd=", 0) == 0) {
+            option = option.substr(4);
+            spd = stof(option);
         } else {
             dprintf(fd->data[0], "unsupported location argument: %s\n", option.c_str());
         }
@@ -671,9 +679,12 @@
     gMockLatitudeDegrees = lat;
     gMockLongitudeDegrees = lon;
     gMockAltitudeMeters = ele;
+    gMockBearingDegrees = bea;
+    gMockSpeedMetersPerSec = spd;
 
-    dprintf(fd->data[0], "mock location updated to lat=%f lon=%f ele=%f\n", gMockLatitudeDegrees,
-            gMockLongitudeDegrees, gMockAltitudeMeters);
+    dprintf(fd->data[0], "mock location updated to lat=%f lon=%f ele=%f bea=%f spd=%f\n",
+            gMockLatitudeDegrees, gMockLongitudeDegrees, gMockAltitudeMeters, gMockBearingDegrees,
+            gMockSpeedMetersPerSec);
 
     return Void();
 }
@@ -682,7 +693,7 @@
 Return<void> GnssTemplate<T_IGnss>::help(const hidl_handle& fd) {
     dprintf(fd->data[0],
             "invalid option for Gnss HAL; valid options are:\n"
-            "location lat=.. lon=.. ele=..\n");
+            "location [lat=..] [lon=..] [ele=..] [bea=..] [spd=..]\n");
     return Void();
 }
 
diff --git a/gnss/common/utils/default/v2_1/GnssDebug.cpp b/gnss/common/utils/default/v2_1/GnssDebug.cpp
index d78b0b6..537a90c 100644
--- a/gnss/common/utils/default/v2_1/GnssDebug.cpp
+++ b/gnss/common/utils/default/v2_1/GnssDebug.cpp
@@ -33,8 +33,8 @@
             .latitudeDegrees = gMockLatitudeDegrees,
             .longitudeDegrees = gMockLongitudeDegrees,
             .altitudeMeters = gMockAltitudeMeters,
-            .speedMetersPerSec = kMockSpeedMetersPerSec,
-            .bearingDegrees = kMockBearingDegrees,
+            .speedMetersPerSec = gMockSpeedMetersPerSec,
+            .bearingDegrees = gMockBearingDegrees,
             .horizontalAccuracyMeters = kMockHorizontalAccuracyMeters,
             .verticalAccuracyMeters = kMockVerticalAccuracyMeters,
             .speedAccuracyMetersPerSecond = kMockSpeedAccuracyMetersPerSecond,
diff --git a/neuralnetworks/1.0/utils/Android.bp b/neuralnetworks/1.0/utils/Android.bp
index 57a052f..4d61fc0 100644
--- a/neuralnetworks/1.0/utils/Android.bp
+++ b/neuralnetworks/1.0/utils/Android.bp
@@ -20,6 +20,7 @@
     srcs: ["src/*"],
     local_include_dirs: ["include/nnapi/hal/1.0/"],
     export_include_dirs: ["include"],
+    cflags: ["-Wthread-safety"],
     static_libs: [
         "neuralnetworks_types",
         "neuralnetworks_utils_hal_common",
diff --git a/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/Callbacks.h b/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/Callbacks.h
new file mode 100644
index 0000000..65b75e5
--- /dev/null
+++ b/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/Callbacks.h
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_0_UTILS_CALLBACKS_H
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_0_UTILS_CALLBACKS_H
+
+#include <android/hardware/neuralnetworks/1.0/IExecutionCallback.h>
+#include <android/hardware/neuralnetworks/1.0/IPreparedModelCallback.h>
+#include <android/hardware/neuralnetworks/1.0/types.h>
+#include <nnapi/IPreparedModel.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/CommonUtils.h>
+#include <nnapi/hal/ProtectCallback.h>
+#include <nnapi/hal/TransferValue.h>
+
+namespace android::hardware::neuralnetworks::V1_0::utils {
+
+class PreparedModelCallback final : public IPreparedModelCallback,
+                                    public hal::utils::IProtectedCallback {
+  public:
+    using Data = nn::GeneralResult<nn::SharedPreparedModel>;
+
+    Return<void> notify(ErrorStatus status, const sp<IPreparedModel>& preparedModel) override;
+
+    void notifyAsDeadObject() override;
+
+    Data get();
+
+  private:
+    void notifyInternal(Data result);
+
+    hal::utils::TransferValue<Data> mData;
+};
+
+class ExecutionCallback final : public IExecutionCallback, public hal::utils::IProtectedCallback {
+  public:
+    using Data = nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>>;
+
+    Return<void> notify(ErrorStatus status) override;
+
+    void notifyAsDeadObject() override;
+
+    Data get();
+
+  private:
+    void notifyInternal(Data result);
+
+    hal::utils::TransferValue<Data> mData;
+};
+
+}  // namespace android::hardware::neuralnetworks::V1_0::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_0_UTILS_CALLBACKS_H
diff --git a/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/Conversions.h b/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/Conversions.h
index 8ad98cb..fb77cb2 100644
--- a/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/Conversions.h
+++ b/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/Conversions.h
@@ -24,42 +24,44 @@
 
 namespace android::nn {
 
-Result<OperandType> convert(const hal::V1_0::OperandType& operandType);
-Result<OperationType> convert(const hal::V1_0::OperationType& operationType);
-Result<Operand::LifeTime> convert(const hal::V1_0::OperandLifeTime& lifetime);
-Result<DeviceStatus> convert(const hal::V1_0::DeviceStatus& deviceStatus);
-Result<Capabilities::PerformanceInfo> convert(const hal::V1_0::PerformanceInfo& performanceInfo);
-Result<Capabilities> convert(const hal::V1_0::Capabilities& capabilities);
-Result<DataLocation> convert(const hal::V1_0::DataLocation& location);
-Result<Operand> convert(const hal::V1_0::Operand& operand);
-Result<Operation> convert(const hal::V1_0::Operation& operation);
-Result<Model::OperandValues> convert(const hardware::hidl_vec<uint8_t>& operandValues);
-Result<Memory> convert(const hardware::hidl_memory& memory);
-Result<Model> convert(const hal::V1_0::Model& model);
-Result<Request::Argument> convert(const hal::V1_0::RequestArgument& requestArgument);
-Result<Request> convert(const hal::V1_0::Request& request);
-Result<ErrorStatus> convert(const hal::V1_0::ErrorStatus& status);
+GeneralResult<OperandType> convert(const hal::V1_0::OperandType& operandType);
+GeneralResult<OperationType> convert(const hal::V1_0::OperationType& operationType);
+GeneralResult<Operand::LifeTime> convert(const hal::V1_0::OperandLifeTime& lifetime);
+GeneralResult<DeviceStatus> convert(const hal::V1_0::DeviceStatus& deviceStatus);
+GeneralResult<Capabilities::PerformanceInfo> convert(
+        const hal::V1_0::PerformanceInfo& performanceInfo);
+GeneralResult<Capabilities> convert(const hal::V1_0::Capabilities& capabilities);
+GeneralResult<DataLocation> convert(const hal::V1_0::DataLocation& location);
+GeneralResult<Operand> convert(const hal::V1_0::Operand& operand);
+GeneralResult<Operation> convert(const hal::V1_0::Operation& operation);
+GeneralResult<Model::OperandValues> convert(const hardware::hidl_vec<uint8_t>& operandValues);
+GeneralResult<Memory> convert(const hardware::hidl_memory& memory);
+GeneralResult<Model> convert(const hal::V1_0::Model& model);
+GeneralResult<Request::Argument> convert(const hal::V1_0::RequestArgument& requestArgument);
+GeneralResult<Request> convert(const hal::V1_0::Request& request);
+GeneralResult<ErrorStatus> convert(const hal::V1_0::ErrorStatus& status);
 
 }  // namespace android::nn
 
 namespace android::hardware::neuralnetworks::V1_0::utils {
 
-nn::Result<OperandType> convert(const nn::OperandType& operandType);
-nn::Result<OperationType> convert(const nn::OperationType& operationType);
-nn::Result<OperandLifeTime> convert(const nn::Operand::LifeTime& lifetime);
-nn::Result<DeviceStatus> convert(const nn::DeviceStatus& deviceStatus);
-nn::Result<PerformanceInfo> convert(const nn::Capabilities::PerformanceInfo& performanceInfo);
-nn::Result<Capabilities> convert(const nn::Capabilities& capabilities);
-nn::Result<DataLocation> convert(const nn::DataLocation& location);
-nn::Result<Operand> convert(const nn::Operand& operand);
-nn::Result<Operation> convert(const nn::Operation& operation);
-nn::Result<hidl_vec<uint8_t>> convert(const nn::Model::OperandValues& operandValues);
-nn::Result<hidl_memory> convert(const nn::Memory& memory);
-nn::Result<Model> convert(const nn::Model& model);
-nn::Result<RequestArgument> convert(const nn::Request::Argument& requestArgument);
-nn::Result<hidl_memory> convert(const nn::Request::MemoryPool& memoryPool);
-nn::Result<Request> convert(const nn::Request& request);
-nn::Result<ErrorStatus> convert(const nn::ErrorStatus& status);
+nn::GeneralResult<OperandType> convert(const nn::OperandType& operandType);
+nn::GeneralResult<OperationType> convert(const nn::OperationType& operationType);
+nn::GeneralResult<OperandLifeTime> convert(const nn::Operand::LifeTime& lifetime);
+nn::GeneralResult<DeviceStatus> convert(const nn::DeviceStatus& deviceStatus);
+nn::GeneralResult<PerformanceInfo> convert(
+        const nn::Capabilities::PerformanceInfo& performanceInfo);
+nn::GeneralResult<Capabilities> convert(const nn::Capabilities& capabilities);
+nn::GeneralResult<DataLocation> convert(const nn::DataLocation& location);
+nn::GeneralResult<Operand> convert(const nn::Operand& operand);
+nn::GeneralResult<Operation> convert(const nn::Operation& operation);
+nn::GeneralResult<hidl_vec<uint8_t>> convert(const nn::Model::OperandValues& operandValues);
+nn::GeneralResult<hidl_memory> convert(const nn::Memory& memory);
+nn::GeneralResult<Model> convert(const nn::Model& model);
+nn::GeneralResult<RequestArgument> convert(const nn::Request::Argument& requestArgument);
+nn::GeneralResult<hidl_memory> convert(const nn::Request::MemoryPool& memoryPool);
+nn::GeneralResult<Request> convert(const nn::Request& request);
+nn::GeneralResult<ErrorStatus> convert(const nn::ErrorStatus& status);
 
 }  // namespace android::hardware::neuralnetworks::V1_0::utils
 
diff --git a/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/Device.h b/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/Device.h
new file mode 100644
index 0000000..4403a57
--- /dev/null
+++ b/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/Device.h
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_0_UTILS_DEVICE_H
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_0_UTILS_DEVICE_H
+
+#include <android/hardware/neuralnetworks/1.0/IDevice.h>
+#include <nnapi/IBuffer.h>
+#include <nnapi/IDevice.h>
+#include <nnapi/OperandTypes.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/CommonUtils.h>
+#include <nnapi/hal/ProtectCallback.h>
+
+#include <functional>
+#include <memory>
+#include <optional>
+#include <string>
+#include <vector>
+
+namespace android::hardware::neuralnetworks::V1_0::utils {
+
+class Device final : public nn::IDevice {
+    struct PrivateConstructorTag {};
+
+  public:
+    static nn::GeneralResult<std::shared_ptr<const Device>> create(std::string name,
+                                                                   sp<V1_0::IDevice> device);
+
+    Device(PrivateConstructorTag tag, std::string name, nn::Capabilities capabilities,
+           sp<V1_0::IDevice> device, hal::utils::DeathHandler deathHandler);
+
+    const std::string& getName() const override;
+    const std::string& getVersionString() const override;
+    nn::Version getFeatureLevel() const override;
+    nn::DeviceType getType() const override;
+    const std::vector<nn::Extension>& getSupportedExtensions() const override;
+    const nn::Capabilities& getCapabilities() const override;
+    std::pair<uint32_t, uint32_t> getNumberOfCacheFilesNeeded() const override;
+
+    nn::GeneralResult<void> wait() const override;
+
+    nn::GeneralResult<std::vector<bool>> getSupportedOperations(
+            const nn::Model& model) const override;
+
+    nn::GeneralResult<nn::SharedPreparedModel> prepareModel(
+            const nn::Model& model, nn::ExecutionPreference preference, nn::Priority priority,
+            nn::OptionalTimePoint deadline, const std::vector<nn::NativeHandle>& modelCache,
+            const std::vector<nn::NativeHandle>& dataCache,
+            const nn::CacheToken& token) const override;
+
+    nn::GeneralResult<nn::SharedPreparedModel> prepareModelFromCache(
+            nn::OptionalTimePoint deadline, const std::vector<nn::NativeHandle>& modelCache,
+            const std::vector<nn::NativeHandle>& dataCache,
+            const nn::CacheToken& token) const override;
+
+    nn::GeneralResult<nn::SharedBuffer> allocate(
+            const nn::BufferDesc& desc, const std::vector<nn::SharedPreparedModel>& preparedModels,
+            const std::vector<nn::BufferRole>& inputRoles,
+            const std::vector<nn::BufferRole>& outputRoles) const override;
+
+  private:
+    const std::string kName;
+    const std::string kVersionString = "UNKNOWN";
+    const std::vector<nn::Extension> kExtensions;
+    const nn::Capabilities kCapabilities;
+    const sp<V1_0::IDevice> kDevice;
+    const hal::utils::DeathHandler kDeathHandler;
+};
+
+}  // namespace android::hardware::neuralnetworks::V1_0::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_0_UTILS_DEVICE_H
diff --git a/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/PreparedModel.h b/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/PreparedModel.h
new file mode 100644
index 0000000..31f366d
--- /dev/null
+++ b/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/PreparedModel.h
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_0_UTILS_PREPARED_MODEL_H
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_0_UTILS_PREPARED_MODEL_H
+
+#include <android/hardware/neuralnetworks/1.0/IPreparedModel.h>
+#include <nnapi/IPreparedModel.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/CommonUtils.h>
+#include <nnapi/hal/ProtectCallback.h>
+
+#include <memory>
+#include <tuple>
+#include <utility>
+#include <vector>
+
+namespace android::hardware::neuralnetworks::V1_0::utils {
+
+class PreparedModel final : public nn::IPreparedModel {
+    struct PrivateConstructorTag {};
+
+  public:
+    static nn::GeneralResult<std::shared_ptr<const PreparedModel>> create(
+            sp<V1_0::IPreparedModel> preparedModel);
+
+    PreparedModel(PrivateConstructorTag tag, sp<V1_0::IPreparedModel> preparedModel,
+                  hal::utils::DeathHandler deathHandler);
+
+    nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>> execute(
+            const nn::Request& request, nn::MeasureTiming measure,
+            const nn::OptionalTimePoint& deadline,
+            const nn::OptionalTimeoutDuration& loopTimeoutDuration) const override;
+
+    nn::GeneralResult<std::pair<nn::SyncFence, nn::ExecuteFencedInfoCallback>> executeFenced(
+            const nn::Request& request, const std::vector<nn::SyncFence>& waitFor,
+            nn::MeasureTiming measure, const nn::OptionalTimePoint& deadline,
+            const nn::OptionalTimeoutDuration& loopTimeoutDuration,
+            const nn::OptionalTimeoutDuration& timeoutDurationAfterFence) const override;
+
+    std::any getUnderlyingResource() const override;
+
+  private:
+    const sp<V1_0::IPreparedModel> kPreparedModel;
+    const hal::utils::DeathHandler kDeathHandler;
+};
+
+}  // namespace android::hardware::neuralnetworks::V1_0::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_0_UTILS_PREPARED_MODEL_H
diff --git a/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/Service.h b/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/Service.h
new file mode 100644
index 0000000..11fbb9e
--- /dev/null
+++ b/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/Service.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_0_UTILS_SERVICE_H
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_0_UTILS_SERVICE_H
+
+#include <nnapi/IDevice.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <string>
+
+namespace android::hardware::neuralnetworks::V1_0::utils {
+
+nn::GeneralResult<nn::SharedDevice> getDevice(const std::string& name);
+
+}  // namespace android::hardware::neuralnetworks::V1_0::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_0_UTILS_SERVICE_H
diff --git a/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/Utils.h b/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/Utils.h
index ec8da06..baa2b95 100644
--- a/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/Utils.h
+++ b/neuralnetworks/1.0/utils/include/nnapi/hal/1.0/Utils.h
@@ -22,6 +22,7 @@
 #include <android-base/logging.h>
 #include <android/hardware/neuralnetworks/1.0/types.h>
 #include <nnapi/Result.h>
+#include <nnapi/TypeUtils.h>
 #include <nnapi/Types.h>
 #include <nnapi/Validation.h>
 
@@ -31,10 +32,14 @@
 
 template <typename Type>
 nn::Result<void> validate(const Type& halObject) {
-    const auto canonical = NN_TRY(nn::convert(halObject));
-    const auto version = NN_TRY(nn::validate(canonical));
+    const auto maybeCanonical = nn::convert(halObject);
+    if (!maybeCanonical.has_value()) {
+        return nn::error() << maybeCanonical.error().message;
+    }
+    const auto version = NN_TRY(nn::validate(maybeCanonical.value()));
     if (version > utils::kVersion) {
-        return NN_ERROR() << "";
+        return NN_ERROR() << "Insufficient version: " << version << " vs required "
+                          << utils::kVersion;
     }
     return {};
 }
@@ -51,9 +56,14 @@
 template <typename Type>
 decltype(nn::convert(std::declval<Type>())) validatedConvertToCanonical(const Type& halObject) {
     auto canonical = NN_TRY(nn::convert(halObject));
-    const auto version = NN_TRY(nn::validate(canonical));
+    const auto maybeVersion = nn::validate(canonical);
+    if (!maybeVersion.has_value()) {
+        return nn::error() << maybeVersion.error();
+    }
+    const auto version = maybeVersion.value();
     if (version > utils::kVersion) {
-        return NN_ERROR() << "";
+        return NN_ERROR() << "Insufficient version: " << version << " vs required "
+                          << utils::kVersion;
     }
     return canonical;
 }
diff --git a/neuralnetworks/1.0/utils/src/Callbacks.cpp b/neuralnetworks/1.0/utils/src/Callbacks.cpp
new file mode 100644
index 0000000..f286bcc
--- /dev/null
+++ b/neuralnetworks/1.0/utils/src/Callbacks.cpp
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "Callbacks.h"
+
+#include "Conversions.h"
+#include "PreparedModel.h"
+#include "Utils.h"
+
+#include <android/hardware/neuralnetworks/1.0/IExecutionCallback.h>
+#include <android/hardware/neuralnetworks/1.0/IPreparedModelCallback.h>
+#include <android/hardware/neuralnetworks/1.0/types.h>
+#include <nnapi/IPreparedModel.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/CommonUtils.h>
+#include <nnapi/hal/ProtectCallback.h>
+#include <nnapi/hal/TransferValue.h>
+
+#include <utility>
+
+namespace android::hardware::neuralnetworks::V1_0::utils {
+namespace {
+
+nn::GeneralResult<nn::SharedPreparedModel> convertPreparedModel(
+        const sp<IPreparedModel>& preparedModel) {
+    return NN_TRY(utils::PreparedModel::create(preparedModel));
+}
+
+}  // namespace
+
+Return<void> PreparedModelCallback::notify(ErrorStatus status,
+                                           const sp<IPreparedModel>& preparedModel) {
+    if (status != ErrorStatus::NONE) {
+        const auto canonical =
+                validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+        notifyInternal(NN_ERROR(canonical) << "preparedModel failed with " << toString(status));
+    } else if (preparedModel == nullptr) {
+        notifyInternal(NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+                       << "Returned preparedModel is nullptr");
+    } else {
+        notifyInternal(convertPreparedModel(preparedModel));
+    }
+    return Void();
+}
+
+void PreparedModelCallback::notifyAsDeadObject() {
+    notifyInternal(NN_ERROR(nn::ErrorStatus::DEAD_OBJECT) << "Dead object");
+}
+
+PreparedModelCallback::Data PreparedModelCallback::get() {
+    return mData.take();
+}
+
+void PreparedModelCallback::notifyInternal(PreparedModelCallback::Data result) {
+    mData.put(std::move(result));
+}
+
+// ExecutionCallback methods begin here
+
+Return<void> ExecutionCallback::notify(ErrorStatus status) {
+    if (status != ErrorStatus::NONE) {
+        const auto canonical =
+                validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+        notifyInternal(NN_ERROR(canonical) << "execute failed with " << toString(status));
+    } else {
+        notifyInternal({});
+    }
+    return Void();
+}
+
+void ExecutionCallback::notifyAsDeadObject() {
+    notifyInternal(NN_ERROR(nn::ErrorStatus::DEAD_OBJECT) << "Dead object");
+}
+
+ExecutionCallback::Data ExecutionCallback::get() {
+    return mData.take();
+}
+
+void ExecutionCallback::notifyInternal(ExecutionCallback::Data result) {
+    mData.put(std::move(result));
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_0::utils
diff --git a/neuralnetworks/1.0/utils/src/Conversions.cpp b/neuralnetworks/1.0/utils/src/Conversions.cpp
index 4a58f3b..f301065 100644
--- a/neuralnetworks/1.0/utils/src/Conversions.cpp
+++ b/neuralnetworks/1.0/utils/src/Conversions.cpp
@@ -52,7 +52,7 @@
 using ConvertOutput = std::decay_t<decltype(convert(std::declval<Input>()).value())>;
 
 template <typename Type>
-Result<std::vector<ConvertOutput<Type>>> convert(const hidl_vec<Type>& arguments) {
+GeneralResult<std::vector<ConvertOutput<Type>>> convert(const hidl_vec<Type>& arguments) {
     std::vector<ConvertOutput<Type>> canonical;
     canonical.reserve(arguments.size());
     for (const auto& argument : arguments) {
@@ -63,30 +63,31 @@
 
 }  // anonymous namespace
 
-Result<OperandType> convert(const hal::V1_0::OperandType& operandType) {
+GeneralResult<OperandType> convert(const hal::V1_0::OperandType& operandType) {
     return static_cast<OperandType>(operandType);
 }
 
-Result<OperationType> convert(const hal::V1_0::OperationType& operationType) {
+GeneralResult<OperationType> convert(const hal::V1_0::OperationType& operationType) {
     return static_cast<OperationType>(operationType);
 }
 
-Result<Operand::LifeTime> convert(const hal::V1_0::OperandLifeTime& lifetime) {
+GeneralResult<Operand::LifeTime> convert(const hal::V1_0::OperandLifeTime& lifetime) {
     return static_cast<Operand::LifeTime>(lifetime);
 }
 
-Result<DeviceStatus> convert(const hal::V1_0::DeviceStatus& deviceStatus) {
+GeneralResult<DeviceStatus> convert(const hal::V1_0::DeviceStatus& deviceStatus) {
     return static_cast<DeviceStatus>(deviceStatus);
 }
 
-Result<Capabilities::PerformanceInfo> convert(const hal::V1_0::PerformanceInfo& performanceInfo) {
+GeneralResult<Capabilities::PerformanceInfo> convert(
+        const hal::V1_0::PerformanceInfo& performanceInfo) {
     return Capabilities::PerformanceInfo{
             .execTime = performanceInfo.execTime,
             .powerUsage = performanceInfo.powerUsage,
     };
 }
 
-Result<Capabilities> convert(const hal::V1_0::Capabilities& capabilities) {
+GeneralResult<Capabilities> convert(const hal::V1_0::Capabilities& capabilities) {
     const auto quantized8Performance = NN_TRY(convert(capabilities.quantized8Performance));
     const auto float32Performance = NN_TRY(convert(capabilities.float32Performance));
 
@@ -100,7 +101,7 @@
     };
 }
 
-Result<DataLocation> convert(const hal::V1_0::DataLocation& location) {
+GeneralResult<DataLocation> convert(const hal::V1_0::DataLocation& location) {
     return DataLocation{
             .poolIndex = location.poolIndex,
             .offset = location.offset,
@@ -108,7 +109,7 @@
     };
 }
 
-Result<Operand> convert(const hal::V1_0::Operand& operand) {
+GeneralResult<Operand> convert(const hal::V1_0::Operand& operand) {
     return Operand{
             .type = NN_TRY(convert(operand.type)),
             .dimensions = operand.dimensions,
@@ -119,7 +120,7 @@
     };
 }
 
-Result<Operation> convert(const hal::V1_0::Operation& operation) {
+GeneralResult<Operation> convert(const hal::V1_0::Operation& operation) {
     return Operation{
             .type = NN_TRY(convert(operation.type)),
             .inputs = operation.inputs,
@@ -127,15 +128,15 @@
     };
 }
 
-Result<Model::OperandValues> convert(const hidl_vec<uint8_t>& operandValues) {
+GeneralResult<Model::OperandValues> convert(const hidl_vec<uint8_t>& operandValues) {
     return Model::OperandValues(operandValues.data(), operandValues.size());
 }
 
-Result<Memory> convert(const hidl_memory& memory) {
+GeneralResult<Memory> convert(const hidl_memory& memory) {
     return createSharedMemoryFromHidlMemory(memory);
 }
 
-Result<Model> convert(const hal::V1_0::Model& model) {
+GeneralResult<Model> convert(const hal::V1_0::Model& model) {
     auto operations = NN_TRY(convert(model.operations));
 
     // Verify number of consumers.
@@ -144,9 +145,9 @@
     CHECK(model.operands.size() == numberOfConsumers.size());
     for (size_t i = 0; i < model.operands.size(); ++i) {
         if (model.operands[i].numberOfConsumers != numberOfConsumers[i]) {
-            return NN_ERROR() << "Invalid numberOfConsumers for operand " << i << ", expected "
-                              << numberOfConsumers[i] << " but found "
-                              << model.operands[i].numberOfConsumers;
+            return NN_ERROR(ErrorStatus::GENERAL_FAILURE)
+                   << "Invalid numberOfConsumers for operand " << i << ", expected "
+                   << numberOfConsumers[i] << " but found " << model.operands[i].numberOfConsumers;
         }
     }
 
@@ -164,7 +165,7 @@
     };
 }
 
-Result<Request::Argument> convert(const hal::V1_0::RequestArgument& argument) {
+GeneralResult<Request::Argument> convert(const hal::V1_0::RequestArgument& argument) {
     const auto lifetime = argument.hasNoValue ? Request::Argument::LifeTime::NO_VALUE
                                               : Request::Argument::LifeTime::POOL;
     return Request::Argument{
@@ -174,7 +175,7 @@
     };
 }
 
-Result<Request> convert(const hal::V1_0::Request& request) {
+GeneralResult<Request> convert(const hal::V1_0::Request& request) {
     auto memories = NN_TRY(convert(request.pools));
     std::vector<Request::MemoryPool> pools;
     pools.reserve(memories.size());
@@ -187,7 +188,7 @@
     };
 }
 
-Result<ErrorStatus> convert(const hal::V1_0::ErrorStatus& status) {
+GeneralResult<ErrorStatus> convert(const hal::V1_0::ErrorStatus& status) {
     switch (status) {
         case hal::V1_0::ErrorStatus::NONE:
         case hal::V1_0::ErrorStatus::DEVICE_UNAVAILABLE:
@@ -196,7 +197,8 @@
         case hal::V1_0::ErrorStatus::INVALID_ARGUMENT:
             return static_cast<ErrorStatus>(status);
     }
-    return NN_ERROR() << "Invalid ErrorStatus " << underlyingType(status);
+    return NN_ERROR(ErrorStatus::GENERAL_FAILURE)
+           << "Invalid ErrorStatus " << underlyingType(status);
 }
 
 }  // namespace android::nn
@@ -208,7 +210,7 @@
 using ConvertOutput = std::decay_t<decltype(convert(std::declval<Input>()).value())>;
 
 template <typename Type>
-nn::Result<hidl_vec<ConvertOutput<Type>>> convert(const std::vector<Type>& arguments) {
+nn::GeneralResult<hidl_vec<ConvertOutput<Type>>> convert(const std::vector<Type>& arguments) {
     hidl_vec<ConvertOutput<Type>> halObject(arguments.size());
     for (size_t i = 0; i < arguments.size(); ++i) {
         halObject[i] = NN_TRY(utils::convert(arguments[i]));
@@ -218,33 +220,35 @@
 
 }  // anonymous namespace
 
-nn::Result<OperandType> convert(const nn::OperandType& operandType) {
+nn::GeneralResult<OperandType> convert(const nn::OperandType& operandType) {
     return static_cast<OperandType>(operandType);
 }
 
-nn::Result<OperationType> convert(const nn::OperationType& operationType) {
+nn::GeneralResult<OperationType> convert(const nn::OperationType& operationType) {
     return static_cast<OperationType>(operationType);
 }
 
-nn::Result<OperandLifeTime> convert(const nn::Operand::LifeTime& lifetime) {
+nn::GeneralResult<OperandLifeTime> convert(const nn::Operand::LifeTime& lifetime) {
     if (lifetime == nn::Operand::LifeTime::POINTER) {
-        return NN_ERROR() << "Model cannot be converted because it contains pointer-based memory";
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "Model cannot be converted because it contains pointer-based memory";
     }
     return static_cast<OperandLifeTime>(lifetime);
 }
 
-nn::Result<DeviceStatus> convert(const nn::DeviceStatus& deviceStatus) {
+nn::GeneralResult<DeviceStatus> convert(const nn::DeviceStatus& deviceStatus) {
     return static_cast<DeviceStatus>(deviceStatus);
 }
 
-nn::Result<PerformanceInfo> convert(const nn::Capabilities::PerformanceInfo& performanceInfo) {
+nn::GeneralResult<PerformanceInfo> convert(
+        const nn::Capabilities::PerformanceInfo& performanceInfo) {
     return PerformanceInfo{
             .execTime = performanceInfo.execTime,
             .powerUsage = performanceInfo.powerUsage,
     };
 }
 
-nn::Result<Capabilities> convert(const nn::Capabilities& capabilities) {
+nn::GeneralResult<Capabilities> convert(const nn::Capabilities& capabilities) {
     return Capabilities{
             .float32Performance = NN_TRY(convert(
                     capabilities.operandPerformance.lookup(nn::OperandType::TENSOR_FLOAT32))),
@@ -253,7 +257,7 @@
     };
 }
 
-nn::Result<DataLocation> convert(const nn::DataLocation& location) {
+nn::GeneralResult<DataLocation> convert(const nn::DataLocation& location) {
     return DataLocation{
             .poolIndex = location.poolIndex,
             .offset = location.offset,
@@ -261,7 +265,7 @@
     };
 }
 
-nn::Result<Operand> convert(const nn::Operand& operand) {
+nn::GeneralResult<Operand> convert(const nn::Operand& operand) {
     return Operand{
             .type = NN_TRY(convert(operand.type)),
             .dimensions = operand.dimensions,
@@ -273,7 +277,7 @@
     };
 }
 
-nn::Result<Operation> convert(const nn::Operation& operation) {
+nn::GeneralResult<Operation> convert(const nn::Operation& operation) {
     return Operation{
             .type = NN_TRY(convert(operation.type)),
             .inputs = operation.inputs,
@@ -281,20 +285,21 @@
     };
 }
 
-nn::Result<hidl_vec<uint8_t>> convert(const nn::Model::OperandValues& operandValues) {
+nn::GeneralResult<hidl_vec<uint8_t>> convert(const nn::Model::OperandValues& operandValues) {
     return hidl_vec<uint8_t>(operandValues.data(), operandValues.data() + operandValues.size());
 }
 
-nn::Result<hidl_memory> convert(const nn::Memory& memory) {
+nn::GeneralResult<hidl_memory> convert(const nn::Memory& memory) {
     const auto hidlMemory = hidl_memory(memory.name, memory.handle->handle(), memory.size);
     // Copy memory to force the native_handle_t to be copied.
     auto copiedMemory = hidlMemory;
     return copiedMemory;
 }
 
-nn::Result<Model> convert(const nn::Model& model) {
+nn::GeneralResult<Model> convert(const nn::Model& model) {
     if (!hal::utils::hasNoPointerData(model)) {
-        return NN_ERROR() << "Mdoel cannot be converted because it contains pointer-based memory";
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "Mdoel cannot be converted because it contains pointer-based memory";
     }
 
     auto operands = NN_TRY(convert(model.main.operands));
@@ -317,9 +322,10 @@
     };
 }
 
-nn::Result<RequestArgument> convert(const nn::Request::Argument& requestArgument) {
+nn::GeneralResult<RequestArgument> convert(const nn::Request::Argument& requestArgument) {
     if (requestArgument.lifetime == nn::Request::Argument::LifeTime::POINTER) {
-        return NN_ERROR() << "Request cannot be converted because it contains pointer-based memory";
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "Request cannot be converted because it contains pointer-based memory";
     }
     const bool hasNoValue = requestArgument.lifetime == nn::Request::Argument::LifeTime::NO_VALUE;
     return RequestArgument{
@@ -329,13 +335,14 @@
     };
 }
 
-nn::Result<hidl_memory> convert(const nn::Request::MemoryPool& memoryPool) {
+nn::GeneralResult<hidl_memory> convert(const nn::Request::MemoryPool& memoryPool) {
     return convert(std::get<nn::Memory>(memoryPool));
 }
 
-nn::Result<Request> convert(const nn::Request& request) {
+nn::GeneralResult<Request> convert(const nn::Request& request) {
     if (!hal::utils::hasNoPointerData(request)) {
-        return NN_ERROR() << "Request cannot be converted because it contains pointer-based memory";
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "Request cannot be converted because it contains pointer-based memory";
     }
 
     return Request{
@@ -345,7 +352,7 @@
     };
 }
 
-nn::Result<ErrorStatus> convert(const nn::ErrorStatus& status) {
+nn::GeneralResult<ErrorStatus> convert(const nn::ErrorStatus& status) {
     switch (status) {
         case nn::ErrorStatus::NONE:
         case nn::ErrorStatus::DEVICE_UNAVAILABLE:
diff --git a/neuralnetworks/1.0/utils/src/Device.cpp b/neuralnetworks/1.0/utils/src/Device.cpp
new file mode 100644
index 0000000..8292f17
--- /dev/null
+++ b/neuralnetworks/1.0/utils/src/Device.cpp
@@ -0,0 +1,199 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "Device.h"
+
+#include "Callbacks.h"
+#include "Conversions.h"
+#include "Utils.h"
+
+#include <android/hardware/neuralnetworks/1.0/IDevice.h>
+#include <android/hardware/neuralnetworks/1.0/types.h>
+#include <nnapi/IBuffer.h>
+#include <nnapi/IDevice.h>
+#include <nnapi/IPreparedModel.h>
+#include <nnapi/OperandTypes.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/CommonUtils.h>
+#include <nnapi/hal/HandleError.h>
+#include <nnapi/hal/ProtectCallback.h>
+
+#include <functional>
+#include <memory>
+#include <optional>
+#include <string>
+#include <vector>
+
+namespace android::hardware::neuralnetworks::V1_0::utils {
+namespace {
+
+nn::GeneralResult<nn::Capabilities> initCapabilities(V1_0::IDevice* device) {
+    CHECK(device != nullptr);
+
+    nn::GeneralResult<nn::Capabilities> result = NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+                                                 << "uninitialized";
+    const auto cb = [&result](ErrorStatus status, const Capabilities& capabilities) {
+        if (status != ErrorStatus::NONE) {
+            const auto canonical =
+                    validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+            result = NN_ERROR(canonical) << "getCapabilities failed with " << toString(status);
+        } else {
+            result = validatedConvertToCanonical(capabilities);
+        }
+    };
+
+    const auto ret = device->getCapabilities(cb);
+    NN_TRY(hal::utils::handleTransportError(ret));
+
+    return result;
+}
+
+}  // namespace
+
+nn::GeneralResult<std::shared_ptr<const Device>> Device::create(std::string name,
+                                                                sp<V1_0::IDevice> device) {
+    if (name.empty()) {
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "V1_0::utils::Device::create must have non-empty name";
+    }
+    if (device == nullptr) {
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "V1_0::utils::Device::create must have non-null device";
+    }
+
+    auto capabilities = NN_TRY(initCapabilities(device.get()));
+
+    auto deathHandler = NN_TRY(hal::utils::DeathHandler::create(device));
+    return std::make_shared<const Device>(PrivateConstructorTag{}, std::move(name),
+                                          std::move(capabilities), std::move(device),
+                                          std::move(deathHandler));
+}
+
+Device::Device(PrivateConstructorTag /*tag*/, std::string name, nn::Capabilities capabilities,
+               sp<V1_0::IDevice> device, hal::utils::DeathHandler deathHandler)
+    : kName(std::move(name)),
+      kCapabilities(std::move(capabilities)),
+      kDevice(std::move(device)),
+      kDeathHandler(std::move(deathHandler)) {}
+
+const std::string& Device::getName() const {
+    return kName;
+}
+
+const std::string& Device::getVersionString() const {
+    return kVersionString;
+}
+
+nn::Version Device::getFeatureLevel() const {
+    return nn::Version::ANDROID_OC_MR1;
+}
+
+nn::DeviceType Device::getType() const {
+    return nn::DeviceType::OTHER;
+}
+
+const std::vector<nn::Extension>& Device::getSupportedExtensions() const {
+    return kExtensions;
+}
+
+const nn::Capabilities& Device::getCapabilities() const {
+    return kCapabilities;
+}
+
+std::pair<uint32_t, uint32_t> Device::getNumberOfCacheFilesNeeded() const {
+    return std::make_pair(/*numModelCache=*/0, /*numDataCache=*/0);
+}
+
+nn::GeneralResult<void> Device::wait() const {
+    const auto ret = kDevice->ping();
+    return hal::utils::handleTransportError(ret);
+}
+
+nn::GeneralResult<std::vector<bool>> Device::getSupportedOperations(const nn::Model& model) const {
+    // Ensure that model is ready for IPC.
+    std::optional<nn::Model> maybeModelInShared;
+    const nn::Model& modelInShared =
+            NN_TRY(hal::utils::flushDataFromPointerToShared(&model, &maybeModelInShared));
+
+    const auto hidlModel = NN_TRY(convert(modelInShared));
+
+    nn::GeneralResult<std::vector<bool>> result = NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+                                                  << "uninitialized";
+    auto cb = [&result, &model](ErrorStatus status, const hidl_vec<bool>& supportedOperations) {
+        if (status != ErrorStatus::NONE) {
+            const auto canonical =
+                    validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+            result = NN_ERROR(canonical)
+                     << "getSupportedOperations failed with " << toString(status);
+        } else if (supportedOperations.size() != model.main.operations.size()) {
+            result = NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+                     << "getSupportedOperations returned vector of size "
+                     << supportedOperations.size() << " but expected "
+                     << model.main.operations.size();
+        } else {
+            result = supportedOperations;
+        }
+    };
+
+    const auto ret = kDevice->getSupportedOperations(hidlModel, cb);
+    NN_TRY(hal::utils::handleTransportError(ret));
+
+    return result;
+}
+
+nn::GeneralResult<nn::SharedPreparedModel> Device::prepareModel(
+        const nn::Model& model, nn::ExecutionPreference /*preference*/, nn::Priority /*priority*/,
+        nn::OptionalTimePoint /*deadline*/, const std::vector<nn::NativeHandle>& /*modelCache*/,
+        const std::vector<nn::NativeHandle>& /*dataCache*/, const nn::CacheToken& /*token*/) const {
+    // Ensure that model is ready for IPC.
+    std::optional<nn::Model> maybeModelInShared;
+    const nn::Model& modelInShared =
+            NN_TRY(hal::utils::flushDataFromPointerToShared(&model, &maybeModelInShared));
+
+    const auto hidlModel = NN_TRY(convert(modelInShared));
+
+    const auto cb = sp<PreparedModelCallback>::make();
+    const auto scoped = kDeathHandler.protectCallback(cb.get());
+
+    const auto ret = kDevice->prepareModel(hidlModel, cb);
+    const auto status = NN_TRY(hal::utils::handleTransportError(ret));
+    if (status != ErrorStatus::NONE) {
+        const auto canonical =
+                validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+        return NN_ERROR(canonical) << "prepareModel failed with " << toString(status);
+    }
+
+    return cb->get();
+}
+
+nn::GeneralResult<nn::SharedPreparedModel> Device::prepareModelFromCache(
+        nn::OptionalTimePoint /*deadline*/, const std::vector<nn::NativeHandle>& /*modelCache*/,
+        const std::vector<nn::NativeHandle>& /*dataCache*/, const nn::CacheToken& /*token*/) const {
+    return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+           << "IDevice::prepareModelFromCache not supported on 1.0 HAL service";
+}
+
+nn::GeneralResult<nn::SharedBuffer> Device::allocate(
+        const nn::BufferDesc& /*desc*/,
+        const std::vector<nn::SharedPreparedModel>& /*preparedModels*/,
+        const std::vector<nn::BufferRole>& /*inputRoles*/,
+        const std::vector<nn::BufferRole>& /*outputRoles*/) const {
+    return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+           << "IDevice::allocate not supported on 1.0 HAL service";
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_0::utils
diff --git a/neuralnetworks/1.0/utils/src/PreparedModel.cpp b/neuralnetworks/1.0/utils/src/PreparedModel.cpp
new file mode 100644
index 0000000..11ccbe3
--- /dev/null
+++ b/neuralnetworks/1.0/utils/src/PreparedModel.cpp
@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "PreparedModel.h"
+
+#include "Callbacks.h"
+#include "Conversions.h"
+#include "Utils.h"
+
+#include <android/hardware/neuralnetworks/1.0/IPreparedModel.h>
+#include <android/hardware/neuralnetworks/1.0/types.h>
+#include <nnapi/IPreparedModel.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/CommonUtils.h>
+#include <nnapi/hal/HandleError.h>
+#include <nnapi/hal/ProtectCallback.h>
+
+#include <memory>
+#include <tuple>
+#include <utility>
+#include <vector>
+
+namespace android::hardware::neuralnetworks::V1_0::utils {
+
+nn::GeneralResult<std::shared_ptr<const PreparedModel>> PreparedModel::create(
+        sp<V1_0::IPreparedModel> preparedModel) {
+    if (preparedModel == nullptr) {
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "V1_0::utils::PreparedModel::create must have non-null preparedModel";
+    }
+
+    auto deathHandler = NN_TRY(hal::utils::DeathHandler::create(preparedModel));
+    return std::make_shared<const PreparedModel>(PrivateConstructorTag{}, std::move(preparedModel),
+                                                 std::move(deathHandler));
+}
+
+PreparedModel::PreparedModel(PrivateConstructorTag /*tag*/, sp<V1_0::IPreparedModel> preparedModel,
+                             hal::utils::DeathHandler deathHandler)
+    : kPreparedModel(std::move(preparedModel)), kDeathHandler(std::move(deathHandler)) {}
+
+nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>> PreparedModel::execute(
+        const nn::Request& request, nn::MeasureTiming /*measure*/,
+        const nn::OptionalTimePoint& /*deadline*/,
+        const nn::OptionalTimeoutDuration& /*loopTimeoutDuration*/) const {
+    // Ensure that request is ready for IPC.
+    std::optional<nn::Request> maybeRequestInShared;
+    const nn::Request& requestInShared = NN_TRY(hal::utils::makeExecutionFailure(
+            hal::utils::flushDataFromPointerToShared(&request, &maybeRequestInShared)));
+
+    const auto hidlRequest = NN_TRY(hal::utils::makeExecutionFailure(convert(requestInShared)));
+
+    const auto cb = sp<ExecutionCallback>::make();
+    const auto scoped = kDeathHandler.protectCallback(cb.get());
+
+    const auto ret = kPreparedModel->execute(hidlRequest, cb);
+    const auto status =
+            NN_TRY(hal::utils::makeExecutionFailure(hal::utils::handleTransportError(ret)));
+    if (status != ErrorStatus::NONE) {
+        const auto canonical =
+                validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+        return NN_ERROR(canonical) << "execute failed with " << toString(status);
+    }
+
+    auto result = NN_TRY(cb->get());
+    NN_TRY(hal::utils::makeExecutionFailure(
+            hal::utils::unflushDataFromSharedToPointer(request, maybeRequestInShared)));
+
+    return result;
+}
+
+nn::GeneralResult<std::pair<nn::SyncFence, nn::ExecuteFencedInfoCallback>>
+PreparedModel::executeFenced(
+        const nn::Request& /*request*/, const std::vector<nn::SyncFence>& /*waitFor*/,
+        nn::MeasureTiming /*measure*/, const nn::OptionalTimePoint& /*deadline*/,
+        const nn::OptionalTimeoutDuration& /*loopTimeoutDuration*/,
+        const nn::OptionalTimeoutDuration& /*timeoutDurationAfterFence*/) const {
+    return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+           << "IPreparedModel::executeFenced is not supported on 1.0 HAL service";
+}
+
+std::any PreparedModel::getUnderlyingResource() const {
+    sp<V1_0::IPreparedModel> resource = kPreparedModel;
+    return resource;
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_0::utils
diff --git a/neuralnetworks/1.0/utils/src/Service.cpp b/neuralnetworks/1.0/utils/src/Service.cpp
new file mode 100644
index 0000000..ec28b1d
--- /dev/null
+++ b/neuralnetworks/1.0/utils/src/Service.cpp
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "Service.h"
+
+#include <nnapi/IDevice.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/ResilientDevice.h>
+#include <string>
+#include "Device.h"
+
+namespace android::hardware::neuralnetworks::V1_0::utils {
+
+nn::GeneralResult<nn::SharedDevice> getDevice(const std::string& name) {
+    hal::utils::ResilientDevice::Factory makeDevice =
+            [name](bool blocking) -> nn::GeneralResult<nn::SharedDevice> {
+        auto service = blocking ? IDevice::getService(name) : IDevice::tryGetService(name);
+        if (service == nullptr) {
+            return NN_ERROR() << (blocking ? "getService" : "tryGetService") << " returned nullptr";
+        }
+        return Device::create(name, std::move(service));
+    };
+
+    return hal::utils::ResilientDevice::create(std::move(makeDevice));
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_0::utils
diff --git a/neuralnetworks/1.1/utils/Android.bp b/neuralnetworks/1.1/utils/Android.bp
index 85a32c5..909575b 100644
--- a/neuralnetworks/1.1/utils/Android.bp
+++ b/neuralnetworks/1.1/utils/Android.bp
@@ -20,6 +20,7 @@
     srcs: ["src/*"],
     local_include_dirs: ["include/nnapi/hal/1.1/"],
     export_include_dirs: ["include"],
+    cflags: ["-Wthread-safety"],
     static_libs: [
         "neuralnetworks_types",
         "neuralnetworks_utils_hal_common",
diff --git a/neuralnetworks/1.1/utils/include/nnapi/hal/1.1/Conversions.h b/neuralnetworks/1.1/utils/include/nnapi/hal/1.1/Conversions.h
index d0c5397..16ddd53 100644
--- a/neuralnetworks/1.1/utils/include/nnapi/hal/1.1/Conversions.h
+++ b/neuralnetworks/1.1/utils/include/nnapi/hal/1.1/Conversions.h
@@ -24,21 +24,22 @@
 
 namespace android::nn {
 
-Result<OperationType> convert(const hal::V1_1::OperationType& operationType);
-Result<Capabilities> convert(const hal::V1_1::Capabilities& capabilities);
-Result<Operation> convert(const hal::V1_1::Operation& operation);
-Result<Model> convert(const hal::V1_1::Model& model);
-Result<ExecutionPreference> convert(const hal::V1_1::ExecutionPreference& executionPreference);
+GeneralResult<OperationType> convert(const hal::V1_1::OperationType& operationType);
+GeneralResult<Capabilities> convert(const hal::V1_1::Capabilities& capabilities);
+GeneralResult<Operation> convert(const hal::V1_1::Operation& operation);
+GeneralResult<Model> convert(const hal::V1_1::Model& model);
+GeneralResult<ExecutionPreference> convert(
+        const hal::V1_1::ExecutionPreference& executionPreference);
 
 }  // namespace android::nn
 
 namespace android::hardware::neuralnetworks::V1_1::utils {
 
-nn::Result<OperationType> convert(const nn::OperationType& operationType);
-nn::Result<Capabilities> convert(const nn::Capabilities& capabilities);
-nn::Result<Operation> convert(const nn::Operation& operation);
-nn::Result<Model> convert(const nn::Model& model);
-nn::Result<ExecutionPreference> convert(const nn::ExecutionPreference& executionPreference);
+nn::GeneralResult<OperationType> convert(const nn::OperationType& operationType);
+nn::GeneralResult<Capabilities> convert(const nn::Capabilities& capabilities);
+nn::GeneralResult<Operation> convert(const nn::Operation& operation);
+nn::GeneralResult<Model> convert(const nn::Model& model);
+nn::GeneralResult<ExecutionPreference> convert(const nn::ExecutionPreference& executionPreference);
 
 }  // namespace android::hardware::neuralnetworks::V1_1::utils
 
diff --git a/neuralnetworks/1.1/utils/include/nnapi/hal/1.1/Device.h b/neuralnetworks/1.1/utils/include/nnapi/hal/1.1/Device.h
new file mode 100644
index 0000000..f55ac6c
--- /dev/null
+++ b/neuralnetworks/1.1/utils/include/nnapi/hal/1.1/Device.h
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_1_UTILS_DEVICE_H
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_1_UTILS_DEVICE_H
+
+#include <android/hardware/neuralnetworks/1.1/IDevice.h>
+#include <nnapi/IBuffer.h>
+#include <nnapi/IDevice.h>
+#include <nnapi/OperandTypes.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/CommonUtils.h>
+#include <nnapi/hal/ProtectCallback.h>
+
+#include <functional>
+#include <memory>
+#include <optional>
+#include <string>
+#include <vector>
+
+namespace android::hardware::neuralnetworks::V1_1::utils {
+
+class Device final : public nn::IDevice {
+    struct PrivateConstructorTag {};
+
+  public:
+    static nn::GeneralResult<std::shared_ptr<const Device>> create(std::string name,
+                                                                   sp<V1_1::IDevice> device);
+
+    Device(PrivateConstructorTag tag, std::string name, nn::Capabilities capabilities,
+           sp<V1_1::IDevice> device, hal::utils::DeathHandler deathHandler);
+
+    const std::string& getName() const override;
+    const std::string& getVersionString() const override;
+    nn::Version getFeatureLevel() const override;
+    nn::DeviceType getType() const override;
+    const std::vector<nn::Extension>& getSupportedExtensions() const override;
+    const nn::Capabilities& getCapabilities() const override;
+    std::pair<uint32_t, uint32_t> getNumberOfCacheFilesNeeded() const override;
+
+    nn::GeneralResult<void> wait() const override;
+
+    nn::GeneralResult<std::vector<bool>> getSupportedOperations(
+            const nn::Model& model) const override;
+
+    nn::GeneralResult<nn::SharedPreparedModel> prepareModel(
+            const nn::Model& model, nn::ExecutionPreference preference, nn::Priority priority,
+            nn::OptionalTimePoint deadline, const std::vector<nn::NativeHandle>& modelCache,
+            const std::vector<nn::NativeHandle>& dataCache,
+            const nn::CacheToken& token) const override;
+
+    nn::GeneralResult<nn::SharedPreparedModel> prepareModelFromCache(
+            nn::OptionalTimePoint deadline, const std::vector<nn::NativeHandle>& modelCache,
+            const std::vector<nn::NativeHandle>& dataCache,
+            const nn::CacheToken& token) const override;
+
+    nn::GeneralResult<nn::SharedBuffer> allocate(
+            const nn::BufferDesc& desc, const std::vector<nn::SharedPreparedModel>& preparedModels,
+            const std::vector<nn::BufferRole>& inputRoles,
+            const std::vector<nn::BufferRole>& outputRoles) const override;
+
+  private:
+    const std::string kName;
+    const std::string kVersionString = "UNKNOWN";
+    const std::vector<nn::Extension> kExtensions;
+    const nn::Capabilities kCapabilities;
+    const sp<V1_1::IDevice> kDevice;
+    const hal::utils::DeathHandler kDeathHandler;
+};
+
+}  // namespace android::hardware::neuralnetworks::V1_1::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_1_UTILS_DEVICE_H
diff --git a/neuralnetworks/1.1/utils/include/nnapi/hal/1.1/Service.h b/neuralnetworks/1.1/utils/include/nnapi/hal/1.1/Service.h
new file mode 100644
index 0000000..a3ad3cf
--- /dev/null
+++ b/neuralnetworks/1.1/utils/include/nnapi/hal/1.1/Service.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_1_UTILS_SERVICE_H
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_1_UTILS_SERVICE_H
+
+#include <nnapi/IDevice.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <string>
+
+namespace android::hardware::neuralnetworks::V1_1::utils {
+
+nn::GeneralResult<nn::SharedDevice> getDevice(const std::string& name);
+
+}  // namespace android::hardware::neuralnetworks::V1_1::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_1_UTILS_SERVICE_H
diff --git a/neuralnetworks/1.1/utils/include/nnapi/hal/1.1/Utils.h b/neuralnetworks/1.1/utils/include/nnapi/hal/1.1/Utils.h
index 6f9aa60..0fee628 100644
--- a/neuralnetworks/1.1/utils/include/nnapi/hal/1.1/Utils.h
+++ b/neuralnetworks/1.1/utils/include/nnapi/hal/1.1/Utils.h
@@ -22,6 +22,7 @@
 #include <android-base/logging.h>
 #include <android/hardware/neuralnetworks/1.1/types.h>
 #include <nnapi/Result.h>
+#include <nnapi/TypeUtils.h>
 #include <nnapi/Types.h>
 #include <nnapi/Validation.h>
 #include <nnapi/hal/1.0/Conversions.h>
@@ -33,10 +34,14 @@
 
 template <typename Type>
 nn::Result<void> validate(const Type& halObject) {
-    const auto canonical = NN_TRY(nn::convert(halObject));
-    const auto version = NN_TRY(nn::validate(canonical));
+    const auto maybeCanonical = nn::convert(halObject);
+    if (!maybeCanonical.has_value()) {
+        return nn::error() << maybeCanonical.error().message;
+    }
+    const auto version = NN_TRY(nn::validate(maybeCanonical.value()));
     if (version > utils::kVersion) {
-        return NN_ERROR() << "";
+        return NN_ERROR() << "Insufficient version: " << version << " vs required "
+                          << utils::kVersion;
     }
     return {};
 }
@@ -53,9 +58,14 @@
 template <typename Type>
 decltype(nn::convert(std::declval<Type>())) validatedConvertToCanonical(const Type& halObject) {
     auto canonical = NN_TRY(nn::convert(halObject));
-    const auto version = NN_TRY(nn::validate(canonical));
+    const auto maybeVersion = nn::validate(canonical);
+    if (!maybeVersion.has_value()) {
+        return nn::error() << maybeVersion.error();
+    }
+    const auto version = maybeVersion.value();
     if (version > utils::kVersion) {
-        return NN_ERROR() << "";
+        return NN_ERROR() << "Insufficient version: " << version << " vs required "
+                          << utils::kVersion;
     }
     return canonical;
 }
diff --git a/neuralnetworks/1.1/utils/src/Conversions.cpp b/neuralnetworks/1.1/utils/src/Conversions.cpp
index 7fee16b..ffe0752 100644
--- a/neuralnetworks/1.1/utils/src/Conversions.cpp
+++ b/neuralnetworks/1.1/utils/src/Conversions.cpp
@@ -42,7 +42,7 @@
 using convertOutput = std::decay_t<decltype(convert(std::declval<Input>()).value())>;
 
 template <typename Type>
-Result<std::vector<convertOutput<Type>>> convert(const hidl_vec<Type>& arguments) {
+GeneralResult<std::vector<convertOutput<Type>>> convert(const hidl_vec<Type>& arguments) {
     std::vector<convertOutput<Type>> canonical;
     canonical.reserve(arguments.size());
     for (const auto& argument : arguments) {
@@ -53,11 +53,11 @@
 
 }  // anonymous namespace
 
-Result<OperationType> convert(const hal::V1_1::OperationType& operationType) {
+GeneralResult<OperationType> convert(const hal::V1_1::OperationType& operationType) {
     return static_cast<OperationType>(operationType);
 }
 
-Result<Capabilities> convert(const hal::V1_1::Capabilities& capabilities) {
+GeneralResult<Capabilities> convert(const hal::V1_1::Capabilities& capabilities) {
     const auto quantized8Performance = NN_TRY(convert(capabilities.quantized8Performance));
     const auto float32Performance = NN_TRY(convert(capabilities.float32Performance));
     const auto relaxedFloat32toFloat16Performance =
@@ -73,7 +73,7 @@
     };
 }
 
-Result<Operation> convert(const hal::V1_1::Operation& operation) {
+GeneralResult<Operation> convert(const hal::V1_1::Operation& operation) {
     return Operation{
             .type = NN_TRY(convert(operation.type)),
             .inputs = operation.inputs,
@@ -81,7 +81,7 @@
     };
 }
 
-Result<Model> convert(const hal::V1_1::Model& model) {
+GeneralResult<Model> convert(const hal::V1_1::Model& model) {
     auto operations = NN_TRY(convert(model.operations));
 
     // Verify number of consumers.
@@ -90,9 +90,9 @@
     CHECK(model.operands.size() == numberOfConsumers.size());
     for (size_t i = 0; i < model.operands.size(); ++i) {
         if (model.operands[i].numberOfConsumers != numberOfConsumers[i]) {
-            return NN_ERROR() << "Invalid numberOfConsumers for operand " << i << ", expected "
-                              << numberOfConsumers[i] << " but found "
-                              << model.operands[i].numberOfConsumers;
+            return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+                   << "Invalid numberOfConsumers for operand " << i << ", expected "
+                   << numberOfConsumers[i] << " but found " << model.operands[i].numberOfConsumers;
         }
     }
 
@@ -111,7 +111,8 @@
     };
 }
 
-Result<ExecutionPreference> convert(const hal::V1_1::ExecutionPreference& executionPreference) {
+GeneralResult<ExecutionPreference> convert(
+        const hal::V1_1::ExecutionPreference& executionPreference) {
     return static_cast<ExecutionPreference>(executionPreference);
 }
 
@@ -122,20 +123,20 @@
 
 using utils::convert;
 
-nn::Result<V1_0::PerformanceInfo> convert(
+nn::GeneralResult<V1_0::PerformanceInfo> convert(
         const nn::Capabilities::PerformanceInfo& performanceInfo) {
     return V1_0::utils::convert(performanceInfo);
 }
 
-nn::Result<V1_0::Operand> convert(const nn::Operand& operand) {
+nn::GeneralResult<V1_0::Operand> convert(const nn::Operand& operand) {
     return V1_0::utils::convert(operand);
 }
 
-nn::Result<hidl_vec<uint8_t>> convert(const nn::Model::OperandValues& operandValues) {
+nn::GeneralResult<hidl_vec<uint8_t>> convert(const nn::Model::OperandValues& operandValues) {
     return V1_0::utils::convert(operandValues);
 }
 
-nn::Result<hidl_memory> convert(const nn::Memory& memory) {
+nn::GeneralResult<hidl_memory> convert(const nn::Memory& memory) {
     return V1_0::utils::convert(memory);
 }
 
@@ -143,7 +144,7 @@
 using convertOutput = std::decay_t<decltype(convert(std::declval<Input>()).value())>;
 
 template <typename Type>
-nn::Result<hidl_vec<convertOutput<Type>>> convert(const std::vector<Type>& arguments) {
+nn::GeneralResult<hidl_vec<convertOutput<Type>>> convert(const std::vector<Type>& arguments) {
     hidl_vec<convertOutput<Type>> halObject(arguments.size());
     for (size_t i = 0; i < arguments.size(); ++i) {
         halObject[i] = NN_TRY(convert(arguments[i]));
@@ -153,11 +154,11 @@
 
 }  // anonymous namespace
 
-nn::Result<OperationType> convert(const nn::OperationType& operationType) {
+nn::GeneralResult<OperationType> convert(const nn::OperationType& operationType) {
     return static_cast<OperationType>(operationType);
 }
 
-nn::Result<Capabilities> convert(const nn::Capabilities& capabilities) {
+nn::GeneralResult<Capabilities> convert(const nn::Capabilities& capabilities) {
     return Capabilities{
             .float32Performance = NN_TRY(convert(
                     capabilities.operandPerformance.lookup(nn::OperandType::TENSOR_FLOAT32))),
@@ -168,7 +169,7 @@
     };
 }
 
-nn::Result<Operation> convert(const nn::Operation& operation) {
+nn::GeneralResult<Operation> convert(const nn::Operation& operation) {
     return Operation{
             .type = NN_TRY(convert(operation.type)),
             .inputs = operation.inputs,
@@ -176,9 +177,10 @@
     };
 }
 
-nn::Result<Model> convert(const nn::Model& model) {
+nn::GeneralResult<Model> convert(const nn::Model& model) {
     if (!hal::utils::hasNoPointerData(model)) {
-        return NN_ERROR() << "Mdoel cannot be converted because it contains pointer-based memory";
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "Mdoel cannot be converted because it contains pointer-based memory";
     }
 
     auto operands = NN_TRY(convert(model.main.operands));
@@ -202,7 +204,7 @@
     };
 }
 
-nn::Result<ExecutionPreference> convert(const nn::ExecutionPreference& executionPreference) {
+nn::GeneralResult<ExecutionPreference> convert(const nn::ExecutionPreference& executionPreference) {
     return static_cast<ExecutionPreference>(executionPreference);
 }
 
diff --git a/neuralnetworks/1.1/utils/src/Device.cpp b/neuralnetworks/1.1/utils/src/Device.cpp
new file mode 100644
index 0000000..03b0d6e
--- /dev/null
+++ b/neuralnetworks/1.1/utils/src/Device.cpp
@@ -0,0 +1,202 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "Device.h"
+
+#include "Conversions.h"
+#include "Utils.h"
+
+#include <android/hardware/neuralnetworks/1.0/types.h>
+#include <android/hardware/neuralnetworks/1.1/IDevice.h>
+#include <android/hardware/neuralnetworks/1.1/types.h>
+#include <nnapi/IBuffer.h>
+#include <nnapi/IDevice.h>
+#include <nnapi/IPreparedModel.h>
+#include <nnapi/OperandTypes.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/1.0/Callbacks.h>
+#include <nnapi/hal/CommonUtils.h>
+#include <nnapi/hal/HandleError.h>
+#include <nnapi/hal/ProtectCallback.h>
+
+#include <functional>
+#include <memory>
+#include <optional>
+#include <string>
+#include <vector>
+
+namespace android::hardware::neuralnetworks::V1_1::utils {
+namespace {
+
+nn::GeneralResult<nn::Capabilities> initCapabilities(V1_1::IDevice* device) {
+    CHECK(device != nullptr);
+
+    nn::GeneralResult<nn::Capabilities> result = NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+                                                 << "uninitialized";
+    const auto cb = [&result](V1_0::ErrorStatus status, const Capabilities& capabilities) {
+        if (status != V1_0::ErrorStatus::NONE) {
+            const auto canonical =
+                    validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+            result = NN_ERROR(canonical) << "getCapabilities_1_1 failed with " << toString(status);
+        } else {
+            result = validatedConvertToCanonical(capabilities);
+        }
+    };
+
+    const auto ret = device->getCapabilities_1_1(cb);
+    NN_TRY(hal::utils::handleTransportError(ret));
+
+    return result;
+}
+
+}  // namespace
+
+nn::GeneralResult<std::shared_ptr<const Device>> Device::create(std::string name,
+                                                                sp<V1_1::IDevice> device) {
+    if (name.empty()) {
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "V1_1::utils::Device::create must have non-empty name";
+    }
+    if (device == nullptr) {
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "V1_1::utils::Device::create must have non-null device";
+    }
+
+    auto capabilities = NN_TRY(initCapabilities(device.get()));
+
+    auto deathHandler = NN_TRY(hal::utils::DeathHandler::create(device));
+    return std::make_shared<const Device>(PrivateConstructorTag{}, std::move(name),
+                                          std::move(capabilities), std::move(device),
+                                          std::move(deathHandler));
+}
+
+Device::Device(PrivateConstructorTag /*tag*/, std::string name, nn::Capabilities capabilities,
+               sp<V1_1::IDevice> device, hal::utils::DeathHandler deathHandler)
+    : kName(std::move(name)),
+      kCapabilities(std::move(capabilities)),
+      kDevice(std::move(device)),
+      kDeathHandler(std::move(deathHandler)) {}
+
+const std::string& Device::getName() const {
+    return kName;
+}
+
+const std::string& Device::getVersionString() const {
+    return kVersionString;
+}
+
+nn::Version Device::getFeatureLevel() const {
+    return nn::Version::ANDROID_P;
+}
+
+nn::DeviceType Device::getType() const {
+    return nn::DeviceType::UNKNOWN;
+}
+
+const std::vector<nn::Extension>& Device::getSupportedExtensions() const {
+    return kExtensions;
+}
+
+const nn::Capabilities& Device::getCapabilities() const {
+    return kCapabilities;
+}
+
+std::pair<uint32_t, uint32_t> Device::getNumberOfCacheFilesNeeded() const {
+    return std::make_pair(/*numModelCache=*/0, /*numDataCache=*/0);
+}
+
+nn::GeneralResult<void> Device::wait() const {
+    const auto ret = kDevice->ping();
+    return hal::utils::handleTransportError(ret);
+}
+
+nn::GeneralResult<std::vector<bool>> Device::getSupportedOperations(const nn::Model& model) const {
+    // Ensure that model is ready for IPC.
+    std::optional<nn::Model> maybeModelInShared;
+    const nn::Model& modelInShared =
+            NN_TRY(hal::utils::flushDataFromPointerToShared(&model, &maybeModelInShared));
+
+    const auto hidlModel = NN_TRY(convert(modelInShared));
+
+    nn::GeneralResult<std::vector<bool>> result = NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+                                                  << "uninitialized";
+    auto cb = [&result, &model](V1_0::ErrorStatus status,
+                                const hidl_vec<bool>& supportedOperations) {
+        if (status != V1_0::ErrorStatus::NONE) {
+            const auto canonical =
+                    validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+            result = NN_ERROR(canonical)
+                     << "getSupportedOperations_1_1 failed with " << toString(status);
+        } else if (supportedOperations.size() != model.main.operations.size()) {
+            result = NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+                     << "getSupportedOperations_1_1 returned vector of size "
+                     << supportedOperations.size() << " but expected "
+                     << model.main.operations.size();
+        } else {
+            result = supportedOperations;
+        }
+    };
+
+    const auto ret = kDevice->getSupportedOperations_1_1(hidlModel, cb);
+    NN_TRY(hal::utils::handleTransportError(ret));
+
+    return result;
+}
+
+nn::GeneralResult<nn::SharedPreparedModel> Device::prepareModel(
+        const nn::Model& model, nn::ExecutionPreference preference, nn::Priority /*priority*/,
+        nn::OptionalTimePoint /*deadline*/, const std::vector<nn::NativeHandle>& /*modelCache*/,
+        const std::vector<nn::NativeHandle>& /*dataCache*/, const nn::CacheToken& /*token*/) const {
+    // Ensure that model is ready for IPC.
+    std::optional<nn::Model> maybeModelInShared;
+    const nn::Model& modelInShared =
+            NN_TRY(hal::utils::flushDataFromPointerToShared(&model, &maybeModelInShared));
+
+    const auto hidlModel = NN_TRY(convert(modelInShared));
+    const auto hidlPreference = NN_TRY(convert(preference));
+
+    const auto cb = sp<V1_0::utils::PreparedModelCallback>::make();
+    const auto scoped = kDeathHandler.protectCallback(cb.get());
+
+    const auto ret = kDevice->prepareModel_1_1(hidlModel, hidlPreference, cb);
+    const auto status = NN_TRY(hal::utils::handleTransportError(ret));
+    if (status != V1_0::ErrorStatus::NONE) {
+        const auto canonical =
+                validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+        return NN_ERROR(canonical) << "prepareModel failed with " << toString(status);
+    }
+
+    return cb->get();
+}
+
+nn::GeneralResult<nn::SharedPreparedModel> Device::prepareModelFromCache(
+        nn::OptionalTimePoint /*deadline*/, const std::vector<nn::NativeHandle>& /*modelCache*/,
+        const std::vector<nn::NativeHandle>& /*dataCache*/, const nn::CacheToken& /*token*/) const {
+    return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+           << "IDevice::prepareModelFromCache not supported on 1.1 HAL service";
+}
+
+nn::GeneralResult<nn::SharedBuffer> Device::allocate(
+        const nn::BufferDesc& /*desc*/,
+        const std::vector<nn::SharedPreparedModel>& /*preparedModels*/,
+        const std::vector<nn::BufferRole>& /*inputRoles*/,
+        const std::vector<nn::BufferRole>& /*outputRoles*/) const {
+    return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+           << "IDevice::allocate not supported on 1.1 HAL service";
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_1::utils
diff --git a/neuralnetworks/1.1/utils/src/Service.cpp b/neuralnetworks/1.1/utils/src/Service.cpp
new file mode 100644
index 0000000..e2d3240
--- /dev/null
+++ b/neuralnetworks/1.1/utils/src/Service.cpp
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "Service.h"
+
+#include <nnapi/IDevice.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/ResilientDevice.h>
+#include <string>
+#include "Device.h"
+
+namespace android::hardware::neuralnetworks::V1_1::utils {
+
+nn::GeneralResult<nn::SharedDevice> getDevice(const std::string& name) {
+    hal::utils::ResilientDevice::Factory makeDevice =
+            [name](bool blocking) -> nn::GeneralResult<nn::SharedDevice> {
+        auto service = blocking ? IDevice::getService(name) : IDevice::tryGetService(name);
+        if (service == nullptr) {
+            return NN_ERROR() << (blocking ? "getService" : "tryGetService") << " returned nullptr";
+        }
+        return Device::create(name, std::move(service));
+    };
+
+    return hal::utils::ResilientDevice::create(std::move(makeDevice));
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_1::utils
diff --git a/neuralnetworks/1.2/utils/Android.bp b/neuralnetworks/1.2/utils/Android.bp
index a1dd3d0..22e8659 100644
--- a/neuralnetworks/1.2/utils/Android.bp
+++ b/neuralnetworks/1.2/utils/Android.bp
@@ -20,6 +20,7 @@
     srcs: ["src/*"],
     local_include_dirs: ["include/nnapi/hal/1.2/"],
     export_include_dirs: ["include"],
+    cflags: ["-Wthread-safety"],
     static_libs: [
         "neuralnetworks_types",
         "neuralnetworks_utils_hal_common",
diff --git a/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/Callbacks.h b/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/Callbacks.h
new file mode 100644
index 0000000..bc7d92a
--- /dev/null
+++ b/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/Callbacks.h
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_2_UTILS_CALLBACKS_H
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_2_UTILS_CALLBACKS_H
+
+#include <android/hardware/neuralnetworks/1.0/IExecutionCallback.h>
+#include <android/hardware/neuralnetworks/1.0/IPreparedModelCallback.h>
+#include <android/hardware/neuralnetworks/1.0/types.h>
+#include <android/hardware/neuralnetworks/1.2/IExecutionCallback.h>
+#include <android/hardware/neuralnetworks/1.2/IPreparedModelCallback.h>
+#include <android/hardware/neuralnetworks/1.2/types.h>
+#include <nnapi/IPreparedModel.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/1.0/Callbacks.h>
+#include <nnapi/hal/CommonUtils.h>
+#include <nnapi/hal/ProtectCallback.h>
+#include <nnapi/hal/TransferValue.h>
+
+namespace android::hardware::neuralnetworks::V1_2::utils {
+
+class PreparedModelCallback final : public IPreparedModelCallback,
+                                    public hal::utils::IProtectedCallback {
+  public:
+    using Data = nn::GeneralResult<nn::SharedPreparedModel>;
+
+    Return<void> notify(V1_0::ErrorStatus status,
+                        const sp<V1_0::IPreparedModel>& preparedModel) override;
+    Return<void> notify_1_2(V1_0::ErrorStatus status,
+                            const sp<IPreparedModel>& preparedModel) override;
+
+    void notifyAsDeadObject() override;
+
+    Data get();
+
+  private:
+    void notifyInternal(Data result);
+
+    hal::utils::TransferValue<Data> mData;
+};
+
+class ExecutionCallback final : public IExecutionCallback, public hal::utils::IProtectedCallback {
+  public:
+    using Data = nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>>;
+
+    Return<void> notify(V1_0::ErrorStatus status) override;
+    Return<void> notify_1_2(V1_0::ErrorStatus status, const hidl_vec<OutputShape>& outputShapes,
+                            const Timing& timing) override;
+
+    void notifyAsDeadObject() override;
+
+    Data get();
+
+  private:
+    void notifyInternal(Data result);
+
+    hal::utils::TransferValue<Data> mData;
+};
+
+}  // namespace android::hardware::neuralnetworks::V1_2::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_2_UTILS_CALLBACKS_H
diff --git a/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/Conversions.h b/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/Conversions.h
index 81bf792..e6de011 100644
--- a/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/Conversions.h
+++ b/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/Conversions.h
@@ -24,62 +24,64 @@
 
 namespace android::nn {
 
-Result<OperandType> convert(const hal::V1_2::OperandType& operandType);
-Result<OperationType> convert(const hal::V1_2::OperationType& operationType);
-Result<DeviceType> convert(const hal::V1_2::DeviceType& deviceType);
-Result<Capabilities> convert(const hal::V1_2::Capabilities& capabilities);
-Result<Capabilities::OperandPerformance> convert(
+GeneralResult<OperandType> convert(const hal::V1_2::OperandType& operandType);
+GeneralResult<OperationType> convert(const hal::V1_2::OperationType& operationType);
+GeneralResult<DeviceType> convert(const hal::V1_2::DeviceType& deviceType);
+GeneralResult<Capabilities> convert(const hal::V1_2::Capabilities& capabilities);
+GeneralResult<Capabilities::OperandPerformance> convert(
         const hal::V1_2::Capabilities::OperandPerformance& operandPerformance);
-Result<Operation> convert(const hal::V1_2::Operation& operation);
-Result<Operand::SymmPerChannelQuantParams> convert(
+GeneralResult<Operation> convert(const hal::V1_2::Operation& operation);
+GeneralResult<Operand::SymmPerChannelQuantParams> convert(
         const hal::V1_2::SymmPerChannelQuantParams& symmPerChannelQuantParams);
-Result<Operand> convert(const hal::V1_2::Operand& operand);
-Result<Operand::ExtraParams> convert(const hal::V1_2::Operand::ExtraParams& extraParams);
-Result<Model> convert(const hal::V1_2::Model& model);
-Result<Model::ExtensionNameAndPrefix> convert(
+GeneralResult<Operand> convert(const hal::V1_2::Operand& operand);
+GeneralResult<Operand::ExtraParams> convert(const hal::V1_2::Operand::ExtraParams& extraParams);
+GeneralResult<Model> convert(const hal::V1_2::Model& model);
+GeneralResult<Model::ExtensionNameAndPrefix> convert(
         const hal::V1_2::Model::ExtensionNameAndPrefix& extensionNameAndPrefix);
-Result<OutputShape> convert(const hal::V1_2::OutputShape& outputShape);
-Result<MeasureTiming> convert(const hal::V1_2::MeasureTiming& measureTiming);
-Result<Timing> convert(const hal::V1_2::Timing& timing);
-Result<Extension> convert(const hal::V1_2::Extension& extension);
-Result<Extension::OperandTypeInformation> convert(
+GeneralResult<OutputShape> convert(const hal::V1_2::OutputShape& outputShape);
+GeneralResult<MeasureTiming> convert(const hal::V1_2::MeasureTiming& measureTiming);
+GeneralResult<Timing> convert(const hal::V1_2::Timing& timing);
+GeneralResult<Extension> convert(const hal::V1_2::Extension& extension);
+GeneralResult<Extension::OperandTypeInformation> convert(
         const hal::V1_2::Extension::OperandTypeInformation& operandTypeInformation);
-Result<NativeHandle> convert(const hardware::hidl_handle& handle);
+GeneralResult<NativeHandle> convert(const hardware::hidl_handle& handle);
 
-Result<std::vector<Extension>> convert(const hardware::hidl_vec<hal::V1_2::Extension>& extensions);
-Result<std::vector<NativeHandle>> convert(const hardware::hidl_vec<hardware::hidl_handle>& handles);
-Result<std::vector<OutputShape>> convert(
+GeneralResult<std::vector<Extension>> convert(
+        const hardware::hidl_vec<hal::V1_2::Extension>& extensions);
+GeneralResult<std::vector<NativeHandle>> convert(
+        const hardware::hidl_vec<hardware::hidl_handle>& handles);
+GeneralResult<std::vector<OutputShape>> convert(
         const hardware::hidl_vec<hal::V1_2::OutputShape>& outputShapes);
 
 }  // namespace android::nn
 
 namespace android::hardware::neuralnetworks::V1_2::utils {
 
-nn::Result<OperandType> convert(const nn::OperandType& operandType);
-nn::Result<OperationType> convert(const nn::OperationType& operationType);
-nn::Result<DeviceType> convert(const nn::DeviceType& deviceType);
-nn::Result<Capabilities> convert(const nn::Capabilities& capabilities);
-nn::Result<Capabilities::OperandPerformance> convert(
+nn::GeneralResult<OperandType> convert(const nn::OperandType& operandType);
+nn::GeneralResult<OperationType> convert(const nn::OperationType& operationType);
+nn::GeneralResult<DeviceType> convert(const nn::DeviceType& deviceType);
+nn::GeneralResult<Capabilities> convert(const nn::Capabilities& capabilities);
+nn::GeneralResult<Capabilities::OperandPerformance> convert(
         const nn::Capabilities::OperandPerformance& operandPerformance);
-nn::Result<Operation> convert(const nn::Operation& operation);
-nn::Result<SymmPerChannelQuantParams> convert(
+nn::GeneralResult<Operation> convert(const nn::Operation& operation);
+nn::GeneralResult<SymmPerChannelQuantParams> convert(
         const nn::Operand::SymmPerChannelQuantParams& symmPerChannelQuantParams);
-nn::Result<Operand> convert(const nn::Operand& operand);
-nn::Result<Operand::ExtraParams> convert(const nn::Operand::ExtraParams& extraParams);
-nn::Result<Model> convert(const nn::Model& model);
-nn::Result<Model::ExtensionNameAndPrefix> convert(
+nn::GeneralResult<Operand> convert(const nn::Operand& operand);
+nn::GeneralResult<Operand::ExtraParams> convert(const nn::Operand::ExtraParams& extraParams);
+nn::GeneralResult<Model> convert(const nn::Model& model);
+nn::GeneralResult<Model::ExtensionNameAndPrefix> convert(
         const nn::Model::ExtensionNameAndPrefix& extensionNameAndPrefix);
-nn::Result<OutputShape> convert(const nn::OutputShape& outputShape);
-nn::Result<MeasureTiming> convert(const nn::MeasureTiming& measureTiming);
-nn::Result<Timing> convert(const nn::Timing& timing);
-nn::Result<Extension> convert(const nn::Extension& extension);
-nn::Result<Extension::OperandTypeInformation> convert(
+nn::GeneralResult<OutputShape> convert(const nn::OutputShape& outputShape);
+nn::GeneralResult<MeasureTiming> convert(const nn::MeasureTiming& measureTiming);
+nn::GeneralResult<Timing> convert(const nn::Timing& timing);
+nn::GeneralResult<Extension> convert(const nn::Extension& extension);
+nn::GeneralResult<Extension::OperandTypeInformation> convert(
         const nn::Extension::OperandTypeInformation& operandTypeInformation);
-nn::Result<hidl_handle> convert(const nn::NativeHandle& handle);
+nn::GeneralResult<hidl_handle> convert(const nn::NativeHandle& handle);
 
-nn::Result<hidl_vec<Extension>> convert(const std::vector<nn::Extension>& extensions);
-nn::Result<hidl_vec<hidl_handle>> convert(const std::vector<nn::NativeHandle>& handles);
-nn::Result<hidl_vec<OutputShape>> convert(const std::vector<nn::OutputShape>& outputShapes);
+nn::GeneralResult<hidl_vec<Extension>> convert(const std::vector<nn::Extension>& extensions);
+nn::GeneralResult<hidl_vec<hidl_handle>> convert(const std::vector<nn::NativeHandle>& handles);
+nn::GeneralResult<hidl_vec<OutputShape>> convert(const std::vector<nn::OutputShape>& outputShapes);
 
 }  // namespace android::hardware::neuralnetworks::V1_2::utils
 
diff --git a/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/Device.h b/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/Device.h
new file mode 100644
index 0000000..eb317b1
--- /dev/null
+++ b/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/Device.h
@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_2_UTILS_DEVICE_H
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_2_UTILS_DEVICE_H
+
+#include <android/hardware/neuralnetworks/1.2/IDevice.h>
+#include <nnapi/IBuffer.h>
+#include <nnapi/IDevice.h>
+#include <nnapi/OperandTypes.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/CommonUtils.h>
+#include <nnapi/hal/ProtectCallback.h>
+
+#include <functional>
+#include <memory>
+#include <optional>
+#include <string>
+#include <vector>
+
+namespace android::hardware::neuralnetworks::V1_2::utils {
+
+nn::GeneralResult<std::string> initVersionString(V1_2::IDevice* device);
+nn::GeneralResult<nn::DeviceType> initDeviceType(V1_2::IDevice* device);
+nn::GeneralResult<std::vector<nn::Extension>> initExtensions(V1_2::IDevice* device);
+nn::GeneralResult<nn::Capabilities> initCapabilities(V1_2::IDevice* device);
+nn::GeneralResult<std::pair<uint32_t, uint32_t>> initNumberOfCacheFilesNeeded(
+        V1_2::IDevice* device);
+
+class Device final : public nn::IDevice {
+    struct PrivateConstructorTag {};
+
+  public:
+    static nn::GeneralResult<std::shared_ptr<const Device>> create(std::string name,
+                                                                   sp<V1_2::IDevice> device);
+
+    Device(PrivateConstructorTag tag, std::string name, std::string versionString,
+           nn::DeviceType deviceType, std::vector<nn::Extension> extensions,
+           nn::Capabilities capabilities, std::pair<uint32_t, uint32_t> numberOfCacheFilesNeeded,
+           sp<V1_2::IDevice> device, hal::utils::DeathHandler deathHandler);
+
+    const std::string& getName() const override;
+    const std::string& getVersionString() const override;
+    nn::Version getFeatureLevel() const override;
+    nn::DeviceType getType() const override;
+    const std::vector<nn::Extension>& getSupportedExtensions() const override;
+    const nn::Capabilities& getCapabilities() const override;
+    std::pair<uint32_t, uint32_t> getNumberOfCacheFilesNeeded() const override;
+
+    nn::GeneralResult<void> wait() const override;
+
+    nn::GeneralResult<std::vector<bool>> getSupportedOperations(
+            const nn::Model& model) const override;
+
+    nn::GeneralResult<nn::SharedPreparedModel> prepareModel(
+            const nn::Model& model, nn::ExecutionPreference preference, nn::Priority priority,
+            nn::OptionalTimePoint deadline, const std::vector<nn::NativeHandle>& modelCache,
+            const std::vector<nn::NativeHandle>& dataCache,
+            const nn::CacheToken& token) const override;
+
+    nn::GeneralResult<nn::SharedPreparedModel> prepareModelFromCache(
+            nn::OptionalTimePoint deadline, const std::vector<nn::NativeHandle>& modelCache,
+            const std::vector<nn::NativeHandle>& dataCache,
+            const nn::CacheToken& token) const override;
+
+    nn::GeneralResult<nn::SharedBuffer> allocate(
+            const nn::BufferDesc& desc, const std::vector<nn::SharedPreparedModel>& preparedModels,
+            const std::vector<nn::BufferRole>& inputRoles,
+            const std::vector<nn::BufferRole>& outputRoles) const override;
+
+  private:
+    const std::string kName;
+    const std::string kVersionString;
+    const nn::DeviceType kDeviceType;
+    const std::vector<nn::Extension> kExtensions;
+    const nn::Capabilities kCapabilities;
+    const std::pair<uint32_t, uint32_t> kNumberOfCacheFilesNeeded;
+    const sp<V1_2::IDevice> kDevice;
+    const hal::utils::DeathHandler kDeathHandler;
+};
+
+}  // namespace android::hardware::neuralnetworks::V1_2::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_2_UTILS_DEVICE_H
diff --git a/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/PreparedModel.h b/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/PreparedModel.h
new file mode 100644
index 0000000..65e1e8a
--- /dev/null
+++ b/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/PreparedModel.h
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_2_UTILS_PREPARED_MODEL_H
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_2_UTILS_PREPARED_MODEL_H
+
+#include <android/hardware/neuralnetworks/1.2/IPreparedModel.h>
+#include <android/hardware/neuralnetworks/1.2/types.h>
+#include <nnapi/IPreparedModel.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/CommonUtils.h>
+#include <nnapi/hal/ProtectCallback.h>
+
+#include <memory>
+#include <tuple>
+#include <utility>
+#include <vector>
+
+namespace android::hardware::neuralnetworks::V1_2::utils {
+
+class PreparedModel final : public nn::IPreparedModel {
+    struct PrivateConstructorTag {};
+
+  public:
+    static nn::GeneralResult<std::shared_ptr<const PreparedModel>> create(
+            sp<V1_2::IPreparedModel> preparedModel);
+
+    PreparedModel(PrivateConstructorTag tag, sp<V1_2::IPreparedModel> preparedModel,
+                  hal::utils::DeathHandler deathHandler);
+
+    nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>> execute(
+            const nn::Request& request, nn::MeasureTiming measure,
+            const nn::OptionalTimePoint& deadline,
+            const nn::OptionalTimeoutDuration& loopTimeoutDuration) const override;
+
+    nn::GeneralResult<std::pair<nn::SyncFence, nn::ExecuteFencedInfoCallback>> executeFenced(
+            const nn::Request& request, const std::vector<nn::SyncFence>& waitFor,
+            nn::MeasureTiming measure, const nn::OptionalTimePoint& deadline,
+            const nn::OptionalTimeoutDuration& loopTimeoutDuration,
+            const nn::OptionalTimeoutDuration& timeoutDurationAfterFence) const override;
+
+    std::any getUnderlyingResource() const override;
+
+  private:
+    nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>> executeSynchronously(
+            const V1_0::Request& request, MeasureTiming measure) const;
+    nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>> executeAsynchronously(
+            const V1_0::Request& request, MeasureTiming measure) const;
+
+    const sp<V1_2::IPreparedModel> kPreparedModel;
+    const hal::utils::DeathHandler kDeathHandler;
+};
+
+}  // namespace android::hardware::neuralnetworks::V1_2::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_2_UTILS_PREPARED_MODEL_H
diff --git a/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/Service.h b/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/Service.h
new file mode 100644
index 0000000..44f004f
--- /dev/null
+++ b/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/Service.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_2_UTILS_SERVICE_H
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_2_UTILS_SERVICE_H
+
+#include <nnapi/IDevice.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <string>
+
+namespace android::hardware::neuralnetworks::V1_2::utils {
+
+nn::GeneralResult<nn::SharedDevice> getDevice(const std::string& name);
+
+}  // namespace android::hardware::neuralnetworks::V1_2::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_2_UTILS_SERVICE_H
diff --git a/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/Utils.h b/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/Utils.h
index b1c2f1a..a9a6bae 100644
--- a/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/Utils.h
+++ b/neuralnetworks/1.2/utils/include/nnapi/hal/1.2/Utils.h
@@ -22,6 +22,7 @@
 #include <android-base/logging.h>
 #include <android/hardware/neuralnetworks/1.2/types.h>
 #include <nnapi/Result.h>
+#include <nnapi/TypeUtils.h>
 #include <nnapi/Types.h>
 #include <nnapi/Validation.h>
 #include <nnapi/hal/1.0/Conversions.h>
@@ -38,10 +39,14 @@
 
 template <typename Type>
 nn::Result<void> validate(const Type& halObject) {
-    const auto canonical = NN_TRY(nn::convert(halObject));
-    const auto version = NN_TRY(nn::validate(canonical));
+    const auto maybeCanonical = nn::convert(halObject);
+    if (!maybeCanonical.has_value()) {
+        return nn::error() << maybeCanonical.error().message;
+    }
+    const auto version = NN_TRY(nn::validate(maybeCanonical.value()));
     if (version > utils::kVersion) {
-        return NN_ERROR() << "";
+        return NN_ERROR() << "Insufficient version: " << version << " vs required "
+                          << utils::kVersion;
     }
     return {};
 }
@@ -58,9 +63,14 @@
 template <typename Type>
 decltype(nn::convert(std::declval<Type>())) validatedConvertToCanonical(const Type& halObject) {
     auto canonical = NN_TRY(nn::convert(halObject));
-    const auto version = NN_TRY(nn::validate(canonical));
+    const auto maybeVersion = nn::validate(canonical);
+    if (!maybeVersion.has_value()) {
+        return nn::error() << maybeVersion.error();
+    }
+    const auto version = maybeVersion.value();
     if (version > utils::kVersion) {
-        return NN_ERROR() << "";
+        return NN_ERROR() << "Insufficient version: " << version << " vs required "
+                          << utils::kVersion;
     }
     return canonical;
 }
diff --git a/neuralnetworks/1.2/utils/src/Callbacks.cpp b/neuralnetworks/1.2/utils/src/Callbacks.cpp
new file mode 100644
index 0000000..cb739f0
--- /dev/null
+++ b/neuralnetworks/1.2/utils/src/Callbacks.cpp
@@ -0,0 +1,147 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "Callbacks.h"
+
+#include "Conversions.h"
+#include "PreparedModel.h"
+#include "Utils.h"
+
+#include <android/hardware/neuralnetworks/1.0/types.h>
+#include <android/hardware/neuralnetworks/1.2/IExecutionCallback.h>
+#include <android/hardware/neuralnetworks/1.2/IPreparedModelCallback.h>
+#include <android/hardware/neuralnetworks/1.2/types.h>
+#include <nnapi/IPreparedModel.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/1.0/Conversions.h>
+#include <nnapi/hal/1.0/PreparedModel.h>
+#include <nnapi/hal/CommonUtils.h>
+#include <nnapi/hal/HandleError.h>
+#include <nnapi/hal/ProtectCallback.h>
+#include <nnapi/hal/TransferValue.h>
+
+#include <utility>
+
+namespace android::hardware::neuralnetworks::V1_2::utils {
+namespace {
+
+nn::GeneralResult<nn::SharedPreparedModel> convertPreparedModel(
+        const sp<V1_0::IPreparedModel>& preparedModel) {
+    return NN_TRY(V1_0::utils::PreparedModel::create(preparedModel));
+}
+
+nn::GeneralResult<nn::SharedPreparedModel> convertPreparedModel(
+        const sp<IPreparedModel>& preparedModel) {
+    return NN_TRY(utils::PreparedModel::create(preparedModel));
+}
+
+nn::GeneralResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>>
+convertExecutionGeneralResultsHelper(const hidl_vec<OutputShape>& outputShapes,
+                                     const Timing& timing) {
+    return std::make_pair(NN_TRY(validatedConvertToCanonical(outputShapes)),
+                          NN_TRY(validatedConvertToCanonical(timing)));
+}
+
+nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>>
+convertExecutionGeneralResults(const hidl_vec<OutputShape>& outputShapes, const Timing& timing) {
+    return hal::utils::makeExecutionFailure(
+            convertExecutionGeneralResultsHelper(outputShapes, timing));
+}
+
+}  // namespace
+
+Return<void> PreparedModelCallback::notify(V1_0::ErrorStatus status,
+                                           const sp<V1_0::IPreparedModel>& preparedModel) {
+    if (status != V1_0::ErrorStatus::NONE) {
+        const auto canonical =
+                validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+        notifyInternal(NN_ERROR(canonical) << "preparedModel failed with " << toString(status));
+    } else if (preparedModel == nullptr) {
+        notifyInternal(NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+                       << "Returned preparedModel is nullptr");
+    } else {
+        notifyInternal(convertPreparedModel(preparedModel));
+    }
+    return Void();
+}
+
+Return<void> PreparedModelCallback::notify_1_2(V1_0::ErrorStatus status,
+                                               const sp<IPreparedModel>& preparedModel) {
+    if (status != V1_0::ErrorStatus::NONE) {
+        const auto canonical =
+                validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+        notifyInternal(NN_ERROR(canonical) << "preparedModel failed with " << toString(status));
+    } else if (preparedModel == nullptr) {
+        notifyInternal(NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+                       << "Returned preparedModel is nullptr");
+    } else {
+        notifyInternal(convertPreparedModel(preparedModel));
+    }
+    return Void();
+}
+
+void PreparedModelCallback::notifyAsDeadObject() {
+    notifyInternal(NN_ERROR(nn::ErrorStatus::DEAD_OBJECT) << "Dead object");
+}
+
+PreparedModelCallback::Data PreparedModelCallback::get() {
+    return mData.take();
+}
+
+void PreparedModelCallback::notifyInternal(PreparedModelCallback::Data result) {
+    mData.put(std::move(result));
+}
+
+// ExecutionCallback methods begin here
+
+Return<void> ExecutionCallback::notify(V1_0::ErrorStatus status) {
+    if (status != V1_0::ErrorStatus::NONE) {
+        const auto canonical =
+                validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+        notifyInternal(NN_ERROR(canonical) << "execute failed with " << toString(status));
+    } else {
+        notifyInternal({});
+    }
+    return Void();
+}
+
+Return<void> ExecutionCallback::notify_1_2(V1_0::ErrorStatus status,
+                                           const hidl_vec<OutputShape>& outputShapes,
+                                           const Timing& timing) {
+    if (status != V1_0::ErrorStatus::NONE) {
+        const auto canonical =
+                validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+        notifyInternal(NN_ERROR(canonical) << "execute failed with " << toString(status));
+    } else {
+        notifyInternal(convertExecutionGeneralResults(outputShapes, timing));
+    }
+    return Void();
+}
+
+void ExecutionCallback::notifyAsDeadObject() {
+    notifyInternal(NN_ERROR(nn::ErrorStatus::DEAD_OBJECT) << "Dead object");
+}
+
+ExecutionCallback::Data ExecutionCallback::get() {
+    return mData.take();
+}
+
+void ExecutionCallback::notifyInternal(ExecutionCallback::Data result) {
+    mData.put(std::move(result));
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_2::utils
diff --git a/neuralnetworks/1.2/utils/src/Conversions.cpp b/neuralnetworks/1.2/utils/src/Conversions.cpp
index fed314b..378719a 100644
--- a/neuralnetworks/1.2/utils/src/Conversions.cpp
+++ b/neuralnetworks/1.2/utils/src/Conversions.cpp
@@ -26,6 +26,7 @@
 #include <nnapi/Types.h>
 #include <nnapi/hal/1.0/Conversions.h>
 #include <nnapi/hal/CommonUtils.h>
+#include <nnapi/hal/HandleError.h>
 
 #include <algorithm>
 #include <functional>
@@ -78,7 +79,7 @@
 using ConvertOutput = std::decay_t<decltype(convert(std::declval<Input>()).value())>;
 
 template <typename Type>
-Result<std::vector<ConvertOutput<Type>>> convertVec(const hidl_vec<Type>& arguments) {
+GeneralResult<std::vector<ConvertOutput<Type>>> convertVec(const hidl_vec<Type>& arguments) {
     std::vector<ConvertOutput<Type>> canonical;
     canonical.reserve(arguments.size());
     for (const auto& argument : arguments) {
@@ -88,25 +89,25 @@
 }
 
 template <typename Type>
-Result<std::vector<ConvertOutput<Type>>> convert(const hidl_vec<Type>& arguments) {
+GeneralResult<std::vector<ConvertOutput<Type>>> convert(const hidl_vec<Type>& arguments) {
     return convertVec(arguments);
 }
 
 }  // anonymous namespace
 
-Result<OperandType> convert(const hal::V1_2::OperandType& operandType) {
+GeneralResult<OperandType> convert(const hal::V1_2::OperandType& operandType) {
     return static_cast<OperandType>(operandType);
 }
 
-Result<OperationType> convert(const hal::V1_2::OperationType& operationType) {
+GeneralResult<OperationType> convert(const hal::V1_2::OperationType& operationType) {
     return static_cast<OperationType>(operationType);
 }
 
-Result<DeviceType> convert(const hal::V1_2::DeviceType& deviceType) {
+GeneralResult<DeviceType> convert(const hal::V1_2::DeviceType& deviceType) {
     return static_cast<DeviceType>(deviceType);
 }
 
-Result<Capabilities> convert(const hal::V1_2::Capabilities& capabilities) {
+GeneralResult<Capabilities> convert(const hal::V1_2::Capabilities& capabilities) {
     const bool validOperandTypes = std::all_of(
             capabilities.operandPerformance.begin(), capabilities.operandPerformance.end(),
             [](const hal::V1_2::Capabilities::OperandPerformance& operandPerformance) {
@@ -114,7 +115,7 @@
                 return !maybeType.has_value() ? false : validOperandType(maybeType.value());
             });
     if (!validOperandTypes) {
-        return NN_ERROR()
+        return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
                << "Invalid OperandType when converting OperandPerformance in Capabilities";
     }
 
@@ -124,8 +125,9 @@
             NN_TRY(convert(capabilities.relaxedFloat32toFloat16PerformanceTensor));
     auto operandPerformance = NN_TRY(convert(capabilities.operandPerformance));
 
-    auto table =
-            NN_TRY(Capabilities::OperandPerformanceTable::create(std::move(operandPerformance)));
+    auto table = NN_TRY(hal::utils::makeGeneralFailure(
+            Capabilities::OperandPerformanceTable::create(std::move(operandPerformance)),
+            nn::ErrorStatus::GENERAL_FAILURE));
 
     return Capabilities{
             .relaxedFloat32toFloat16PerformanceScalar = relaxedFloat32toFloat16PerformanceScalar,
@@ -134,7 +136,7 @@
     };
 }
 
-Result<Capabilities::OperandPerformance> convert(
+GeneralResult<Capabilities::OperandPerformance> convert(
         const hal::V1_2::Capabilities::OperandPerformance& operandPerformance) {
     return Capabilities::OperandPerformance{
             .type = NN_TRY(convert(operandPerformance.type)),
@@ -142,7 +144,7 @@
     };
 }
 
-Result<Operation> convert(const hal::V1_2::Operation& operation) {
+GeneralResult<Operation> convert(const hal::V1_2::Operation& operation) {
     return Operation{
             .type = NN_TRY(convert(operation.type)),
             .inputs = operation.inputs,
@@ -150,7 +152,7 @@
     };
 }
 
-Result<Operand::SymmPerChannelQuantParams> convert(
+GeneralResult<Operand::SymmPerChannelQuantParams> convert(
         const hal::V1_2::SymmPerChannelQuantParams& symmPerChannelQuantParams) {
     return Operand::SymmPerChannelQuantParams{
             .scales = symmPerChannelQuantParams.scales,
@@ -158,7 +160,7 @@
     };
 }
 
-Result<Operand> convert(const hal::V1_2::Operand& operand) {
+GeneralResult<Operand> convert(const hal::V1_2::Operand& operand) {
     return Operand{
             .type = NN_TRY(convert(operand.type)),
             .dimensions = operand.dimensions,
@@ -170,7 +172,7 @@
     };
 }
 
-Result<Operand::ExtraParams> convert(const hal::V1_2::Operand::ExtraParams& extraParams) {
+GeneralResult<Operand::ExtraParams> convert(const hal::V1_2::Operand::ExtraParams& extraParams) {
     using Discriminator = hal::V1_2::Operand::ExtraParams::hidl_discriminator;
     switch (extraParams.getDiscriminator()) {
         case Discriminator::none:
@@ -180,11 +182,12 @@
         case Discriminator::extension:
             return extraParams.extension();
     }
-    return NN_ERROR() << "Unrecognized Operand::ExtraParams discriminator: "
-                      << underlyingType(extraParams.getDiscriminator());
+    return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+           << "Unrecognized Operand::ExtraParams discriminator: "
+           << underlyingType(extraParams.getDiscriminator());
 }
 
-Result<Model> convert(const hal::V1_2::Model& model) {
+GeneralResult<Model> convert(const hal::V1_2::Model& model) {
     auto operations = NN_TRY(convert(model.operations));
 
     // Verify number of consumers.
@@ -193,9 +196,9 @@
     CHECK(model.operands.size() == numberOfConsumers.size());
     for (size_t i = 0; i < model.operands.size(); ++i) {
         if (model.operands[i].numberOfConsumers != numberOfConsumers[i]) {
-            return NN_ERROR() << "Invalid numberOfConsumers for operand " << i << ", expected "
-                              << numberOfConsumers[i] << " but found "
-                              << model.operands[i].numberOfConsumers;
+            return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+                   << "Invalid numberOfConsumers for operand " << i << ", expected "
+                   << numberOfConsumers[i] << " but found " << model.operands[i].numberOfConsumers;
         }
     }
 
@@ -215,7 +218,7 @@
     };
 }
 
-Result<Model::ExtensionNameAndPrefix> convert(
+GeneralResult<Model::ExtensionNameAndPrefix> convert(
         const hal::V1_2::Model::ExtensionNameAndPrefix& extensionNameAndPrefix) {
     return Model::ExtensionNameAndPrefix{
             .name = extensionNameAndPrefix.name,
@@ -223,29 +226,29 @@
     };
 }
 
-Result<OutputShape> convert(const hal::V1_2::OutputShape& outputShape) {
+GeneralResult<OutputShape> convert(const hal::V1_2::OutputShape& outputShape) {
     return OutputShape{
             .dimensions = outputShape.dimensions,
             .isSufficient = outputShape.isSufficient,
     };
 }
 
-Result<MeasureTiming> convert(const hal::V1_2::MeasureTiming& measureTiming) {
+GeneralResult<MeasureTiming> convert(const hal::V1_2::MeasureTiming& measureTiming) {
     return static_cast<MeasureTiming>(measureTiming);
 }
 
-Result<Timing> convert(const hal::V1_2::Timing& timing) {
+GeneralResult<Timing> convert(const hal::V1_2::Timing& timing) {
     return Timing{.timeOnDevice = timing.timeOnDevice, .timeInDriver = timing.timeInDriver};
 }
 
-Result<Extension> convert(const hal::V1_2::Extension& extension) {
+GeneralResult<Extension> convert(const hal::V1_2::Extension& extension) {
     return Extension{
             .name = extension.name,
             .operandTypes = NN_TRY(convert(extension.operandTypes)),
     };
 }
 
-Result<Extension::OperandTypeInformation> convert(
+GeneralResult<Extension::OperandTypeInformation> convert(
         const hal::V1_2::Extension::OperandTypeInformation& operandTypeInformation) {
     return Extension::OperandTypeInformation{
             .type = operandTypeInformation.type,
@@ -254,20 +257,21 @@
     };
 }
 
-Result<NativeHandle> convert(const hidl_handle& handle) {
+GeneralResult<NativeHandle> convert(const hidl_handle& handle) {
     auto* cloned = native_handle_clone(handle.getNativeHandle());
     return ::android::NativeHandle::create(cloned, /*ownsHandle=*/true);
 }
 
-Result<std::vector<Extension>> convert(const hidl_vec<hal::V1_2::Extension>& extensions) {
+GeneralResult<std::vector<Extension>> convert(const hidl_vec<hal::V1_2::Extension>& extensions) {
     return convertVec(extensions);
 }
 
-Result<std::vector<NativeHandle>> convert(const hidl_vec<hidl_handle>& handles) {
+GeneralResult<std::vector<NativeHandle>> convert(const hidl_vec<hidl_handle>& handles) {
     return convertVec(handles);
 }
 
-Result<std::vector<OutputShape>> convert(const hidl_vec<hal::V1_2::OutputShape>& outputShapes) {
+GeneralResult<std::vector<OutputShape>> convert(
+        const hidl_vec<hal::V1_2::OutputShape>& outputShapes) {
     return convertVec(outputShapes);
 }
 
@@ -278,24 +282,24 @@
 
 using utils::convert;
 
-nn::Result<V1_0::OperandLifeTime> convert(const nn::Operand::LifeTime& lifetime) {
+nn::GeneralResult<V1_0::OperandLifeTime> convert(const nn::Operand::LifeTime& lifetime) {
     return V1_0::utils::convert(lifetime);
 }
 
-nn::Result<V1_0::PerformanceInfo> convert(
+nn::GeneralResult<V1_0::PerformanceInfo> convert(
         const nn::Capabilities::PerformanceInfo& performanceInfo) {
     return V1_0::utils::convert(performanceInfo);
 }
 
-nn::Result<V1_0::DataLocation> convert(const nn::DataLocation& location) {
+nn::GeneralResult<V1_0::DataLocation> convert(const nn::DataLocation& location) {
     return V1_0::utils::convert(location);
 }
 
-nn::Result<hidl_vec<uint8_t>> convert(const nn::Model::OperandValues& operandValues) {
+nn::GeneralResult<hidl_vec<uint8_t>> convert(const nn::Model::OperandValues& operandValues) {
     return V1_0::utils::convert(operandValues);
 }
 
-nn::Result<hidl_memory> convert(const nn::Memory& memory) {
+nn::GeneralResult<hidl_memory> convert(const nn::Memory& memory) {
     return V1_0::utils::convert(memory);
 }
 
@@ -303,7 +307,7 @@
 using ConvertOutput = std::decay_t<decltype(convert(std::declval<Input>()).value())>;
 
 template <typename Type>
-nn::Result<hidl_vec<ConvertOutput<Type>>> convertVec(const std::vector<Type>& arguments) {
+nn::GeneralResult<hidl_vec<ConvertOutput<Type>>> convertVec(const std::vector<Type>& arguments) {
     hidl_vec<ConvertOutput<Type>> halObject(arguments.size());
     for (size_t i = 0; i < arguments.size(); ++i) {
         halObject[i] = NN_TRY(convert(arguments[i]));
@@ -312,22 +316,23 @@
 }
 
 template <typename Type>
-nn::Result<hidl_vec<ConvertOutput<Type>>> convert(const std::vector<Type>& arguments) {
+nn::GeneralResult<hidl_vec<ConvertOutput<Type>>> convert(const std::vector<Type>& arguments) {
     return convertVec(arguments);
 }
 
-nn::Result<Operand::ExtraParams> makeExtraParams(nn::Operand::NoParams /*noParams*/) {
+nn::GeneralResult<Operand::ExtraParams> makeExtraParams(nn::Operand::NoParams /*noParams*/) {
     return Operand::ExtraParams{};
 }
 
-nn::Result<Operand::ExtraParams> makeExtraParams(
+nn::GeneralResult<Operand::ExtraParams> makeExtraParams(
         const nn::Operand::SymmPerChannelQuantParams& channelQuant) {
     Operand::ExtraParams ret;
     ret.channelQuant(NN_TRY(convert(channelQuant)));
     return ret;
 }
 
-nn::Result<Operand::ExtraParams> makeExtraParams(const nn::Operand::ExtensionParams& extension) {
+nn::GeneralResult<Operand::ExtraParams> makeExtraParams(
+        const nn::Operand::ExtensionParams& extension) {
     Operand::ExtraParams ret;
     ret.extension(extension);
     return ret;
@@ -335,28 +340,29 @@
 
 }  // anonymous namespace
 
-nn::Result<OperandType> convert(const nn::OperandType& operandType) {
+nn::GeneralResult<OperandType> convert(const nn::OperandType& operandType) {
     return static_cast<OperandType>(operandType);
 }
 
-nn::Result<OperationType> convert(const nn::OperationType& operationType) {
+nn::GeneralResult<OperationType> convert(const nn::OperationType& operationType) {
     return static_cast<OperationType>(operationType);
 }
 
-nn::Result<DeviceType> convert(const nn::DeviceType& deviceType) {
+nn::GeneralResult<DeviceType> convert(const nn::DeviceType& deviceType) {
     switch (deviceType) {
         case nn::DeviceType::UNKNOWN:
-            return NN_ERROR() << "Invalid DeviceType UNKNOWN";
+            return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE) << "Invalid DeviceType UNKNOWN";
         case nn::DeviceType::OTHER:
         case nn::DeviceType::CPU:
         case nn::DeviceType::GPU:
         case nn::DeviceType::ACCELERATOR:
             return static_cast<DeviceType>(deviceType);
     }
-    return NN_ERROR() << "Invalid DeviceType " << underlyingType(deviceType);
+    return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+           << "Invalid DeviceType " << underlyingType(deviceType);
 }
 
-nn::Result<Capabilities> convert(const nn::Capabilities& capabilities) {
+nn::GeneralResult<Capabilities> convert(const nn::Capabilities& capabilities) {
     std::vector<nn::Capabilities::OperandPerformance> operandPerformance;
     operandPerformance.reserve(capabilities.operandPerformance.asVector().size());
     std::copy_if(capabilities.operandPerformance.asVector().begin(),
@@ -375,7 +381,7 @@
     };
 }
 
-nn::Result<Capabilities::OperandPerformance> convert(
+nn::GeneralResult<Capabilities::OperandPerformance> convert(
         const nn::Capabilities::OperandPerformance& operandPerformance) {
     return Capabilities::OperandPerformance{
             .type = NN_TRY(convert(operandPerformance.type)),
@@ -383,7 +389,7 @@
     };
 }
 
-nn::Result<Operation> convert(const nn::Operation& operation) {
+nn::GeneralResult<Operation> convert(const nn::Operation& operation) {
     return Operation{
             .type = NN_TRY(convert(operation.type)),
             .inputs = operation.inputs,
@@ -391,7 +397,7 @@
     };
 }
 
-nn::Result<SymmPerChannelQuantParams> convert(
+nn::GeneralResult<SymmPerChannelQuantParams> convert(
         const nn::Operand::SymmPerChannelQuantParams& symmPerChannelQuantParams) {
     return SymmPerChannelQuantParams{
             .scales = symmPerChannelQuantParams.scales,
@@ -399,7 +405,7 @@
     };
 }
 
-nn::Result<Operand> convert(const nn::Operand& operand) {
+nn::GeneralResult<Operand> convert(const nn::Operand& operand) {
     return Operand{
             .type = NN_TRY(convert(operand.type)),
             .dimensions = operand.dimensions,
@@ -412,13 +418,14 @@
     };
 }
 
-nn::Result<Operand::ExtraParams> convert(const nn::Operand::ExtraParams& extraParams) {
+nn::GeneralResult<Operand::ExtraParams> convert(const nn::Operand::ExtraParams& extraParams) {
     return std::visit([](const auto& x) { return makeExtraParams(x); }, extraParams);
 }
 
-nn::Result<Model> convert(const nn::Model& model) {
+nn::GeneralResult<Model> convert(const nn::Model& model) {
     if (!hal::utils::hasNoPointerData(model)) {
-        return NN_ERROR() << "Model cannot be converted because it contains pointer-based memory";
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "Model cannot be converted because it contains pointer-based memory";
     }
 
     auto operands = NN_TRY(convert(model.main.operands));
@@ -443,7 +450,7 @@
     };
 }
 
-nn::Result<Model::ExtensionNameAndPrefix> convert(
+nn::GeneralResult<Model::ExtensionNameAndPrefix> convert(
         const nn::Model::ExtensionNameAndPrefix& extensionNameAndPrefix) {
     return Model::ExtensionNameAndPrefix{
             .name = extensionNameAndPrefix.name,
@@ -451,27 +458,27 @@
     };
 }
 
-nn::Result<OutputShape> convert(const nn::OutputShape& outputShape) {
+nn::GeneralResult<OutputShape> convert(const nn::OutputShape& outputShape) {
     return OutputShape{.dimensions = outputShape.dimensions,
                        .isSufficient = outputShape.isSufficient};
 }
 
-nn::Result<MeasureTiming> convert(const nn::MeasureTiming& measureTiming) {
+nn::GeneralResult<MeasureTiming> convert(const nn::MeasureTiming& measureTiming) {
     return static_cast<MeasureTiming>(measureTiming);
 }
 
-nn::Result<Timing> convert(const nn::Timing& timing) {
+nn::GeneralResult<Timing> convert(const nn::Timing& timing) {
     return Timing{.timeOnDevice = timing.timeOnDevice, .timeInDriver = timing.timeInDriver};
 }
 
-nn::Result<Extension> convert(const nn::Extension& extension) {
+nn::GeneralResult<Extension> convert(const nn::Extension& extension) {
     return Extension{
             .name = extension.name,
             .operandTypes = NN_TRY(convert(extension.operandTypes)),
     };
 }
 
-nn::Result<Extension::OperandTypeInformation> convert(
+nn::GeneralResult<Extension::OperandTypeInformation> convert(
         const nn::Extension::OperandTypeInformation& operandTypeInformation) {
     return Extension::OperandTypeInformation{
             .type = operandTypeInformation.type,
@@ -480,22 +487,22 @@
     };
 }
 
-nn::Result<hidl_handle> convert(const nn::NativeHandle& handle) {
+nn::GeneralResult<hidl_handle> convert(const nn::NativeHandle& handle) {
     const auto hidlHandle = hidl_handle(handle->handle());
     // Copy memory to force the native_handle_t to be copied.
     auto copiedHandle = hidlHandle;
     return copiedHandle;
 }
 
-nn::Result<hidl_vec<Extension>> convert(const std::vector<nn::Extension>& extensions) {
+nn::GeneralResult<hidl_vec<Extension>> convert(const std::vector<nn::Extension>& extensions) {
     return convertVec(extensions);
 }
 
-nn::Result<hidl_vec<hidl_handle>> convert(const std::vector<nn::NativeHandle>& handles) {
+nn::GeneralResult<hidl_vec<hidl_handle>> convert(const std::vector<nn::NativeHandle>& handles) {
     return convertVec(handles);
 }
 
-nn::Result<hidl_vec<OutputShape>> convert(const std::vector<nn::OutputShape>& outputShapes) {
+nn::GeneralResult<hidl_vec<OutputShape>> convert(const std::vector<nn::OutputShape>& outputShapes) {
     return convertVec(outputShapes);
 }
 
diff --git a/neuralnetworks/1.2/utils/src/Device.cpp b/neuralnetworks/1.2/utils/src/Device.cpp
new file mode 100644
index 0000000..ca236f1
--- /dev/null
+++ b/neuralnetworks/1.2/utils/src/Device.cpp
@@ -0,0 +1,318 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "Device.h"
+
+#include "Callbacks.h"
+#include "Conversions.h"
+#include "Utils.h"
+
+#include <android/hardware/neuralnetworks/1.0/types.h>
+#include <android/hardware/neuralnetworks/1.1/types.h>
+#include <android/hardware/neuralnetworks/1.2/IDevice.h>
+#include <android/hardware/neuralnetworks/1.2/types.h>
+#include <nnapi/IBuffer.h>
+#include <nnapi/IDevice.h>
+#include <nnapi/IPreparedModel.h>
+#include <nnapi/OperandTypes.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/1.1/Conversions.h>
+#include <nnapi/hal/CommonUtils.h>
+#include <nnapi/hal/HandleError.h>
+#include <nnapi/hal/ProtectCallback.h>
+
+#include <functional>
+#include <memory>
+#include <optional>
+#include <string>
+#include <vector>
+
+namespace android::hardware::neuralnetworks::V1_2::utils {
+
+nn::GeneralResult<std::string> initVersionString(V1_2::IDevice* device) {
+    CHECK(device != nullptr);
+
+    nn::GeneralResult<std::string> result = NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+                                            << "uninitialized";
+    const auto cb = [&result](V1_0::ErrorStatus status, const hidl_string& versionString) {
+        if (status != V1_0::ErrorStatus::NONE) {
+            const auto canonical =
+                    validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+            result = NN_ERROR(canonical) << "getVersionString failed with " << toString(status);
+        } else {
+            result = versionString;
+        }
+    };
+
+    const auto ret = device->getVersionString(cb);
+    NN_TRY(hal::utils::handleTransportError(ret));
+
+    return result;
+}
+
+nn::GeneralResult<nn::DeviceType> initDeviceType(V1_2::IDevice* device) {
+    CHECK(device != nullptr);
+
+    nn::GeneralResult<nn::DeviceType> result = NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+                                               << "uninitialized";
+    const auto cb = [&result](V1_0::ErrorStatus status, DeviceType deviceType) {
+        if (status != V1_0::ErrorStatus::NONE) {
+            const auto canonical =
+                    validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+            result = NN_ERROR(canonical) << "getDeviceType failed with " << toString(status);
+        } else {
+            result = nn::convert(deviceType);
+        }
+    };
+
+    const auto ret = device->getType(cb);
+    NN_TRY(hal::utils::handleTransportError(ret));
+
+    return result;
+}
+
+nn::GeneralResult<std::vector<nn::Extension>> initExtensions(V1_2::IDevice* device) {
+    CHECK(device != nullptr);
+
+    nn::GeneralResult<std::vector<nn::Extension>> result =
+            NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE) << "uninitialized";
+    const auto cb = [&result](V1_0::ErrorStatus status, const hidl_vec<Extension>& extensions) {
+        if (status != V1_0::ErrorStatus::NONE) {
+            const auto canonical =
+                    validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+            result = NN_ERROR(canonical) << "getExtensions failed with " << toString(status);
+        } else {
+            result = nn::convert(extensions);
+        }
+    };
+
+    const auto ret = device->getSupportedExtensions(cb);
+    NN_TRY(hal::utils::handleTransportError(ret));
+
+    return result;
+}
+
+nn::GeneralResult<nn::Capabilities> initCapabilities(V1_2::IDevice* device) {
+    CHECK(device != nullptr);
+
+    nn::GeneralResult<nn::Capabilities> result = NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+                                                 << "uninitialized";
+    const auto cb = [&result](V1_0::ErrorStatus status, const Capabilities& capabilities) {
+        if (status != V1_0::ErrorStatus::NONE) {
+            const auto canonical =
+                    validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+            result = NN_ERROR(canonical) << "getCapabilities_1_2 failed with " << toString(status);
+        } else {
+            result = validatedConvertToCanonical(capabilities);
+        }
+    };
+
+    const auto ret = device->getCapabilities_1_2(cb);
+    NN_TRY(hal::utils::handleTransportError(ret));
+
+    return result;
+}
+
+nn::GeneralResult<std::pair<uint32_t, uint32_t>> initNumberOfCacheFilesNeeded(
+        V1_2::IDevice* device) {
+    CHECK(device != nullptr);
+
+    nn::GeneralResult<std::pair<uint32_t, uint32_t>> result =
+            NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE) << "uninitialized";
+    const auto cb = [&result](V1_0::ErrorStatus status, uint32_t numModelCache,
+                              uint32_t numDataCache) {
+        if (status != V1_0::ErrorStatus::NONE) {
+            const auto canonical =
+                    validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+            result = NN_ERROR(canonical)
+                     << "getNumberOfCacheFilesNeeded failed with " << toString(status);
+        } else {
+            result = std::make_pair(numModelCache, numDataCache);
+        }
+    };
+
+    const auto ret = device->getNumberOfCacheFilesNeeded(cb);
+    NN_TRY(hal::utils::handleTransportError(ret));
+
+    return result;
+}
+
+nn::GeneralResult<std::shared_ptr<const Device>> Device::create(std::string name,
+                                                                sp<V1_2::IDevice> device) {
+    if (name.empty()) {
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "V1_2::utils::Device::create must have non-empty name";
+    }
+    if (device == nullptr) {
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "V1_2::utils::Device::create must have non-null device";
+    }
+
+    auto versionString = NN_TRY(initVersionString(device.get()));
+    const auto deviceType = NN_TRY(initDeviceType(device.get()));
+    auto extensions = NN_TRY(initExtensions(device.get()));
+    auto capabilities = NN_TRY(initCapabilities(device.get()));
+    const auto numberOfCacheFilesNeeded = NN_TRY(initNumberOfCacheFilesNeeded(device.get()));
+
+    auto deathHandler = NN_TRY(hal::utils::DeathHandler::create(device));
+    return std::make_shared<const Device>(
+            PrivateConstructorTag{}, std::move(name), std::move(versionString), deviceType,
+            std::move(extensions), std::move(capabilities), numberOfCacheFilesNeeded,
+            std::move(device), std::move(deathHandler));
+}
+
+Device::Device(PrivateConstructorTag /*tag*/, std::string name, std::string versionString,
+               nn::DeviceType deviceType, std::vector<nn::Extension> extensions,
+               nn::Capabilities capabilities,
+               std::pair<uint32_t, uint32_t> numberOfCacheFilesNeeded, sp<V1_2::IDevice> device,
+               hal::utils::DeathHandler deathHandler)
+    : kName(std::move(name)),
+      kVersionString(std::move(versionString)),
+      kDeviceType(deviceType),
+      kExtensions(std::move(extensions)),
+      kCapabilities(std::move(capabilities)),
+      kNumberOfCacheFilesNeeded(numberOfCacheFilesNeeded),
+      kDevice(std::move(device)),
+      kDeathHandler(std::move(deathHandler)) {}
+
+const std::string& Device::getName() const {
+    return kName;
+}
+
+const std::string& Device::getVersionString() const {
+    return kVersionString;
+}
+
+nn::Version Device::getFeatureLevel() const {
+    return nn::Version::ANDROID_Q;
+}
+
+nn::DeviceType Device::getType() const {
+    return kDeviceType;
+}
+
+const std::vector<nn::Extension>& Device::getSupportedExtensions() const {
+    return kExtensions;
+}
+
+const nn::Capabilities& Device::getCapabilities() const {
+    return kCapabilities;
+}
+
+std::pair<uint32_t, uint32_t> Device::getNumberOfCacheFilesNeeded() const {
+    return kNumberOfCacheFilesNeeded;
+}
+
+nn::GeneralResult<void> Device::wait() const {
+    const auto ret = kDevice->ping();
+    return hal::utils::handleTransportError(ret);
+}
+
+nn::GeneralResult<std::vector<bool>> Device::getSupportedOperations(const nn::Model& model) const {
+    // Ensure that model is ready for IPC.
+    std::optional<nn::Model> maybeModelInShared;
+    const nn::Model& modelInShared =
+            NN_TRY(hal::utils::flushDataFromPointerToShared(&model, &maybeModelInShared));
+
+    const auto hidlModel = NN_TRY(convert(modelInShared));
+
+    nn::GeneralResult<std::vector<bool>> result = NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+                                                  << "uninitialized";
+    auto cb = [&result, &model](V1_0::ErrorStatus status,
+                                const hidl_vec<bool>& supportedOperations) {
+        if (status != V1_0::ErrorStatus::NONE) {
+            const auto canonical =
+                    validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+            result = NN_ERROR(canonical)
+                     << "getSupportedOperations_1_2 failed with " << toString(status);
+        } else if (supportedOperations.size() != model.main.operations.size()) {
+            result = NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+                     << "getSupportedOperations_1_2 returned vector of size "
+                     << supportedOperations.size() << " but expected "
+                     << model.main.operations.size();
+        } else {
+            result = supportedOperations;
+        }
+    };
+
+    const auto ret = kDevice->getSupportedOperations_1_2(hidlModel, cb);
+    NN_TRY(hal::utils::handleTransportError(ret));
+
+    return result;
+}
+
+nn::GeneralResult<nn::SharedPreparedModel> Device::prepareModel(
+        const nn::Model& model, nn::ExecutionPreference preference, nn::Priority /*priority*/,
+        nn::OptionalTimePoint /*deadline*/, const std::vector<nn::NativeHandle>& modelCache,
+        const std::vector<nn::NativeHandle>& dataCache, const nn::CacheToken& token) const {
+    // Ensure that model is ready for IPC.
+    std::optional<nn::Model> maybeModelInShared;
+    const nn::Model& modelInShared =
+            NN_TRY(hal::utils::flushDataFromPointerToShared(&model, &maybeModelInShared));
+
+    const auto hidlModel = NN_TRY(convert(modelInShared));
+    const auto hidlPreference = NN_TRY(V1_1::utils::convert(preference));
+    const auto hidlModelCache = NN_TRY(convert(modelCache));
+    const auto hidlDataCache = NN_TRY(convert(dataCache));
+    const auto hidlToken = token;
+
+    const auto cb = sp<PreparedModelCallback>::make();
+    const auto scoped = kDeathHandler.protectCallback(cb.get());
+
+    const auto ret = kDevice->prepareModel_1_2(hidlModel, hidlPreference, hidlModelCache,
+                                               hidlDataCache, hidlToken, cb);
+    const auto status = NN_TRY(hal::utils::handleTransportError(ret));
+    if (status != V1_0::ErrorStatus::NONE) {
+        const auto canonical =
+                validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+        return NN_ERROR(canonical) << "prepareModel_1_2 failed with " << toString(status);
+    }
+
+    return cb->get();
+}
+
+nn::GeneralResult<nn::SharedPreparedModel> Device::prepareModelFromCache(
+        nn::OptionalTimePoint /*deadline*/, const std::vector<nn::NativeHandle>& modelCache,
+        const std::vector<nn::NativeHandle>& dataCache, const nn::CacheToken& token) const {
+    const auto hidlModelCache = NN_TRY(convert(modelCache));
+    const auto hidlDataCache = NN_TRY(convert(dataCache));
+    const auto hidlToken = token;
+
+    const auto cb = sp<PreparedModelCallback>::make();
+    const auto scoped = kDeathHandler.protectCallback(cb.get());
+
+    const auto ret = kDevice->prepareModelFromCache(hidlModelCache, hidlDataCache, hidlToken, cb);
+    const auto status = NN_TRY(hal::utils::handleTransportError(ret));
+    if (status != V1_0::ErrorStatus::NONE) {
+        const auto canonical =
+                validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+        return NN_ERROR(canonical) << "prepareModelFromCache failed with " << toString(status);
+    }
+
+    return cb->get();
+}
+
+nn::GeneralResult<nn::SharedBuffer> Device::allocate(
+        const nn::BufferDesc& /*desc*/,
+        const std::vector<nn::SharedPreparedModel>& /*preparedModels*/,
+        const std::vector<nn::BufferRole>& /*inputRoles*/,
+        const std::vector<nn::BufferRole>& /*outputRoles*/) const {
+    return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+           << "IDevice::allocate not supported on 1.2 HAL service";
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_2::utils
diff --git a/neuralnetworks/1.2/utils/src/PreparedModel.cpp b/neuralnetworks/1.2/utils/src/PreparedModel.cpp
new file mode 100644
index 0000000..ff9db21
--- /dev/null
+++ b/neuralnetworks/1.2/utils/src/PreparedModel.cpp
@@ -0,0 +1,161 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "PreparedModel.h"
+
+#include "Callbacks.h"
+#include "Conversions.h"
+#include "Utils.h"
+
+#include <android/hardware/neuralnetworks/1.0/types.h>
+#include <android/hardware/neuralnetworks/1.1/types.h>
+#include <android/hardware/neuralnetworks/1.2/IPreparedModel.h>
+#include <android/hardware/neuralnetworks/1.2/types.h>
+#include <nnapi/IPreparedModel.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/1.0/Conversions.h>
+#include <nnapi/hal/CommonUtils.h>
+#include <nnapi/hal/HandleError.h>
+#include <nnapi/hal/ProtectCallback.h>
+
+#include <memory>
+#include <tuple>
+#include <utility>
+#include <vector>
+
+namespace android::hardware::neuralnetworks::V1_2::utils {
+namespace {
+
+nn::GeneralResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>>
+convertExecutionResultsHelper(const hidl_vec<OutputShape>& outputShapes, const Timing& timing) {
+    return std::make_pair(NN_TRY(validatedConvertToCanonical(outputShapes)),
+                          NN_TRY(validatedConvertToCanonical(timing)));
+}
+
+nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>> convertExecutionResults(
+        const hidl_vec<OutputShape>& outputShapes, const Timing& timing) {
+    return hal::utils::makeExecutionFailure(convertExecutionResultsHelper(outputShapes, timing));
+}
+
+}  // namespace
+
+nn::GeneralResult<std::shared_ptr<const PreparedModel>> PreparedModel::create(
+        sp<V1_2::IPreparedModel> preparedModel) {
+    if (preparedModel == nullptr) {
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "V1_2::utils::PreparedModel::create must have non-null preparedModel";
+    }
+
+    auto deathHandler = NN_TRY(hal::utils::DeathHandler::create(preparedModel));
+    return std::make_shared<const PreparedModel>(PrivateConstructorTag{}, std::move(preparedModel),
+                                                 std::move(deathHandler));
+}
+
+PreparedModel::PreparedModel(PrivateConstructorTag /*tag*/, sp<V1_2::IPreparedModel> preparedModel,
+                             hal::utils::DeathHandler deathHandler)
+    : kPreparedModel(std::move(preparedModel)), kDeathHandler(std::move(deathHandler)) {}
+
+nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>>
+PreparedModel::executeSynchronously(const V1_0::Request& request, MeasureTiming measure) const {
+    nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>> result =
+            NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE) << "uninitialized";
+    const auto cb = [&result](V1_0::ErrorStatus status, const hidl_vec<OutputShape>& outputShapes,
+                              const Timing& timing) {
+        if (status != V1_0::ErrorStatus::NONE) {
+            const auto canonical =
+                    validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+            result = NN_ERROR(canonical) << "executeSynchronously failed with " << toString(status);
+        } else {
+            result = convertExecutionResults(outputShapes, timing);
+        }
+    };
+
+    const auto ret = kPreparedModel->executeSynchronously(request, measure, cb);
+    NN_TRY(hal::utils::makeExecutionFailure(hal::utils::handleTransportError(ret)));
+
+    return result;
+}
+
+nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>>
+PreparedModel::executeAsynchronously(const V1_0::Request& request, MeasureTiming measure) const {
+    const auto cb = sp<ExecutionCallback>::make();
+    const auto scoped = kDeathHandler.protectCallback(cb.get());
+
+    const auto ret = kPreparedModel->execute_1_2(request, measure, cb);
+    const auto status =
+            NN_TRY(hal::utils::makeExecutionFailure(hal::utils::handleTransportError(ret)));
+    if (status != V1_0::ErrorStatus::NONE) {
+        const auto canonical =
+                validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+        return NN_ERROR(canonical) << "execute failed with " << toString(status);
+    }
+
+    return cb->get();
+}
+
+nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>> PreparedModel::execute(
+        const nn::Request& request, nn::MeasureTiming measure,
+        const nn::OptionalTimePoint& /*deadline*/,
+        const nn::OptionalTimeoutDuration& /*loopTimeoutDuration*/) const {
+    // Ensure that request is ready for IPC.
+    std::optional<nn::Request> maybeRequestInShared;
+    const nn::Request& requestInShared = NN_TRY(hal::utils::makeExecutionFailure(
+            hal::utils::flushDataFromPointerToShared(&request, &maybeRequestInShared)));
+
+    const auto hidlRequest =
+            NN_TRY(hal::utils::makeExecutionFailure(V1_0::utils::convert(requestInShared)));
+    const auto hidlMeasure = NN_TRY(hal::utils::makeExecutionFailure(convert(measure)));
+
+    nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>> result =
+            NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE) << "uninitialized";
+    const bool preferSynchronous = true;
+
+    // Execute synchronously if allowed.
+    if (preferSynchronous) {
+        result = executeSynchronously(hidlRequest, hidlMeasure);
+    }
+
+    // Run asymchronous execution if execution has not already completed.
+    if (!result.has_value()) {
+        result = executeAsynchronously(hidlRequest, hidlMeasure);
+    }
+
+    // Flush output buffers if suxcessful execution.
+    if (result.has_value()) {
+        NN_TRY(hal::utils::makeExecutionFailure(
+                hal::utils::unflushDataFromSharedToPointer(request, maybeRequestInShared)));
+    }
+
+    return result;
+}
+
+nn::GeneralResult<std::pair<nn::SyncFence, nn::ExecuteFencedInfoCallback>>
+PreparedModel::executeFenced(
+        const nn::Request& /*request*/, const std::vector<nn::SyncFence>& /*waitFor*/,
+        nn::MeasureTiming /*measure*/, const nn::OptionalTimePoint& /*deadline*/,
+        const nn::OptionalTimeoutDuration& /*loopTimeoutDuration*/,
+        const nn::OptionalTimeoutDuration& /*timeoutDurationAfterFence*/) const {
+    return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+           << "IPreparedModel::executeFenced is not supported on 1.2 HAL service";
+}
+
+std::any PreparedModel::getUnderlyingResource() const {
+    sp<V1_0::IPreparedModel> resource = kPreparedModel;
+    return resource;
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_2::utils
diff --git a/neuralnetworks/1.2/utils/src/Service.cpp b/neuralnetworks/1.2/utils/src/Service.cpp
new file mode 100644
index 0000000..110188f
--- /dev/null
+++ b/neuralnetworks/1.2/utils/src/Service.cpp
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "Service.h"
+
+#include <nnapi/IDevice.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/ResilientDevice.h>
+#include <string>
+#include "Device.h"
+
+namespace android::hardware::neuralnetworks::V1_2::utils {
+
+nn::GeneralResult<nn::SharedDevice> getDevice(const std::string& name) {
+    hal::utils::ResilientDevice::Factory makeDevice =
+            [name](bool blocking) -> nn::GeneralResult<nn::SharedDevice> {
+        auto service = blocking ? IDevice::getService(name) : IDevice::tryGetService(name);
+        if (service == nullptr) {
+            return NN_ERROR() << (blocking ? "getService" : "tryGetService") << " returned nullptr";
+        }
+        return Device::create(name, std::move(service));
+    };
+
+    return hal::utils::ResilientDevice::create(std::move(makeDevice));
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_2::utils
diff --git a/neuralnetworks/1.3/utils/Android.bp b/neuralnetworks/1.3/utils/Android.bp
index 279b250..d5d897d 100644
--- a/neuralnetworks/1.3/utils/Android.bp
+++ b/neuralnetworks/1.3/utils/Android.bp
@@ -20,6 +20,7 @@
     srcs: ["src/*"],
     local_include_dirs: ["include/nnapi/hal/1.3/"],
     export_include_dirs: ["include"],
+    cflags: ["-Wthread-safety"],
     static_libs: [
         "neuralnetworks_types",
         "neuralnetworks_utils_hal_common",
diff --git a/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/Buffer.h b/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/Buffer.h
new file mode 100644
index 0000000..637179d
--- /dev/null
+++ b/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/Buffer.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_BUFFER_H
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_BUFFER_H
+
+#include <android/hardware/neuralnetworks/1.3/IBuffer.h>
+#include <android/hardware/neuralnetworks/1.3/types.h>
+#include <nnapi/IBuffer.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <memory>
+
+namespace android::hardware::neuralnetworks::V1_3::utils {
+
+class Buffer final : public nn::IBuffer {
+    struct PrivateConstructorTag {};
+
+  public:
+    static nn::GeneralResult<std::shared_ptr<const Buffer>> create(
+            sp<V1_3::IBuffer> buffer, nn::Request::MemoryDomainToken token);
+
+    Buffer(PrivateConstructorTag tag, sp<V1_3::IBuffer> buffer,
+           nn::Request::MemoryDomainToken token);
+
+    nn::Request::MemoryDomainToken getToken() const override;
+
+    nn::GeneralResult<void> copyTo(const nn::Memory& dst) const override;
+    nn::GeneralResult<void> copyFrom(const nn::Memory& src,
+                                     const nn::Dimensions& dimensions) const override;
+
+  private:
+    const sp<V1_3::IBuffer> kBuffer;
+    const nn::Request::MemoryDomainToken kToken;
+};
+
+}  // namespace android::hardware::neuralnetworks::V1_3::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_BUFFER_H
diff --git a/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/Callbacks.h b/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/Callbacks.h
new file mode 100644
index 0000000..d46b111
--- /dev/null
+++ b/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/Callbacks.h
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_CALLBACKS_H
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_CALLBACKS_H
+
+#include <android/hardware/neuralnetworks/1.0/IExecutionCallback.h>
+#include <android/hardware/neuralnetworks/1.0/IPreparedModelCallback.h>
+#include <android/hardware/neuralnetworks/1.0/types.h>
+#include <android/hardware/neuralnetworks/1.2/IExecutionCallback.h>
+#include <android/hardware/neuralnetworks/1.2/IPreparedModelCallback.h>
+#include <android/hardware/neuralnetworks/1.2/types.h>
+#include <android/hardware/neuralnetworks/1.3/IExecutionCallback.h>
+#include <android/hardware/neuralnetworks/1.3/IPreparedModelCallback.h>
+#include <android/hardware/neuralnetworks/1.3/types.h>
+#include <nnapi/IPreparedModel.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/1.0/Callbacks.h>
+#include <nnapi/hal/CommonUtils.h>
+#include <nnapi/hal/ProtectCallback.h>
+#include <nnapi/hal/TransferValue.h>
+
+namespace android::hardware::neuralnetworks::V1_3::utils {
+
+class PreparedModelCallback final : public IPreparedModelCallback,
+                                    public hal::utils::IProtectedCallback {
+  public:
+    using Data = nn::GeneralResult<nn::SharedPreparedModel>;
+
+    Return<void> notify(V1_0::ErrorStatus status,
+                        const sp<V1_0::IPreparedModel>& preparedModel) override;
+    Return<void> notify_1_2(V1_0::ErrorStatus status,
+                            const sp<V1_2::IPreparedModel>& preparedModel) override;
+    Return<void> notify_1_3(ErrorStatus status, const sp<IPreparedModel>& preparedModel) override;
+
+    void notifyAsDeadObject() override;
+
+    Data get();
+
+  private:
+    void notifyInternal(Data result);
+
+    hal::utils::TransferValue<Data> mData;
+};
+
+class ExecutionCallback final : public IExecutionCallback, public hal::utils::IProtectedCallback {
+  public:
+    using Data = nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>>;
+
+    Return<void> notify(V1_0::ErrorStatus status) override;
+    Return<void> notify_1_2(V1_0::ErrorStatus status,
+                            const hidl_vec<V1_2::OutputShape>& outputShapes,
+                            const V1_2::Timing& timing) override;
+    Return<void> notify_1_3(ErrorStatus status, const hidl_vec<V1_2::OutputShape>& outputShapes,
+                            const V1_2::Timing& timing) override;
+
+    void notifyAsDeadObject() override;
+
+    Data get();
+
+  private:
+    void notifyInternal(Data result);
+
+    hal::utils::TransferValue<Data> mData;
+};
+
+}  // namespace android::hardware::neuralnetworks::V1_3::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_CALLBACKS_H
diff --git a/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/Conversions.h b/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/Conversions.h
index 43987a9..64aa96e 100644
--- a/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/Conversions.h
+++ b/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/Conversions.h
@@ -25,54 +25,54 @@
 
 namespace android::nn {
 
-Result<OperandType> convert(const hal::V1_3::OperandType& operandType);
-Result<OperationType> convert(const hal::V1_3::OperationType& operationType);
-Result<Priority> convert(const hal::V1_3::Priority& priority);
-Result<Capabilities> convert(const hal::V1_3::Capabilities& capabilities);
-Result<Capabilities::OperandPerformance> convert(
+GeneralResult<OperandType> convert(const hal::V1_3::OperandType& operandType);
+GeneralResult<OperationType> convert(const hal::V1_3::OperationType& operationType);
+GeneralResult<Priority> convert(const hal::V1_3::Priority& priority);
+GeneralResult<Capabilities> convert(const hal::V1_3::Capabilities& capabilities);
+GeneralResult<Capabilities::OperandPerformance> convert(
         const hal::V1_3::Capabilities::OperandPerformance& operandPerformance);
-Result<Operation> convert(const hal::V1_3::Operation& operation);
-Result<Operand::LifeTime> convert(const hal::V1_3::OperandLifeTime& operandLifeTime);
-Result<Operand> convert(const hal::V1_3::Operand& operand);
-Result<Model> convert(const hal::V1_3::Model& model);
-Result<Model::Subgraph> convert(const hal::V1_3::Subgraph& subgraph);
-Result<BufferDesc> convert(const hal::V1_3::BufferDesc& bufferDesc);
-Result<BufferRole> convert(const hal::V1_3::BufferRole& bufferRole);
-Result<Request> convert(const hal::V1_3::Request& request);
-Result<Request::MemoryPool> convert(const hal::V1_3::Request::MemoryPool& memoryPool);
-Result<OptionalTimePoint> convert(const hal::V1_3::OptionalTimePoint& optionalTimePoint);
-Result<OptionalTimeoutDuration> convert(
+GeneralResult<Operation> convert(const hal::V1_3::Operation& operation);
+GeneralResult<Operand::LifeTime> convert(const hal::V1_3::OperandLifeTime& operandLifeTime);
+GeneralResult<Operand> convert(const hal::V1_3::Operand& operand);
+GeneralResult<Model> convert(const hal::V1_3::Model& model);
+GeneralResult<Model::Subgraph> convert(const hal::V1_3::Subgraph& subgraph);
+GeneralResult<BufferDesc> convert(const hal::V1_3::BufferDesc& bufferDesc);
+GeneralResult<BufferRole> convert(const hal::V1_3::BufferRole& bufferRole);
+GeneralResult<Request> convert(const hal::V1_3::Request& request);
+GeneralResult<Request::MemoryPool> convert(const hal::V1_3::Request::MemoryPool& memoryPool);
+GeneralResult<OptionalTimePoint> convert(const hal::V1_3::OptionalTimePoint& optionalTimePoint);
+GeneralResult<OptionalTimeoutDuration> convert(
         const hal::V1_3::OptionalTimeoutDuration& optionalTimeoutDuration);
-Result<ErrorStatus> convert(const hal::V1_3::ErrorStatus& errorStatus);
+GeneralResult<ErrorStatus> convert(const hal::V1_3::ErrorStatus& errorStatus);
 
-Result<std::vector<BufferRole>> convert(
+GeneralResult<std::vector<BufferRole>> convert(
         const hardware::hidl_vec<hal::V1_3::BufferRole>& bufferRoles);
 
 }  // namespace android::nn
 
 namespace android::hardware::neuralnetworks::V1_3::utils {
 
-nn::Result<OperandType> convert(const nn::OperandType& operandType);
-nn::Result<OperationType> convert(const nn::OperationType& operationType);
-nn::Result<Priority> convert(const nn::Priority& priority);
-nn::Result<Capabilities> convert(const nn::Capabilities& capabilities);
-nn::Result<Capabilities::OperandPerformance> convert(
+nn::GeneralResult<OperandType> convert(const nn::OperandType& operandType);
+nn::GeneralResult<OperationType> convert(const nn::OperationType& operationType);
+nn::GeneralResult<Priority> convert(const nn::Priority& priority);
+nn::GeneralResult<Capabilities> convert(const nn::Capabilities& capabilities);
+nn::GeneralResult<Capabilities::OperandPerformance> convert(
         const nn::Capabilities::OperandPerformance& operandPerformance);
-nn::Result<Operation> convert(const nn::Operation& operation);
-nn::Result<OperandLifeTime> convert(const nn::Operand::LifeTime& operandLifeTime);
-nn::Result<Operand> convert(const nn::Operand& operand);
-nn::Result<Model> convert(const nn::Model& model);
-nn::Result<Subgraph> convert(const nn::Model::Subgraph& subgraph);
-nn::Result<BufferDesc> convert(const nn::BufferDesc& bufferDesc);
-nn::Result<BufferRole> convert(const nn::BufferRole& bufferRole);
-nn::Result<Request> convert(const nn::Request& request);
-nn::Result<Request::MemoryPool> convert(const nn::Request::MemoryPool& memoryPool);
-nn::Result<OptionalTimePoint> convert(const nn::OptionalTimePoint& optionalTimePoint);
-nn::Result<OptionalTimeoutDuration> convert(
+nn::GeneralResult<Operation> convert(const nn::Operation& operation);
+nn::GeneralResult<OperandLifeTime> convert(const nn::Operand::LifeTime& operandLifeTime);
+nn::GeneralResult<Operand> convert(const nn::Operand& operand);
+nn::GeneralResult<Model> convert(const nn::Model& model);
+nn::GeneralResult<Subgraph> convert(const nn::Model::Subgraph& subgraph);
+nn::GeneralResult<BufferDesc> convert(const nn::BufferDesc& bufferDesc);
+nn::GeneralResult<BufferRole> convert(const nn::BufferRole& bufferRole);
+nn::GeneralResult<Request> convert(const nn::Request& request);
+nn::GeneralResult<Request::MemoryPool> convert(const nn::Request::MemoryPool& memoryPool);
+nn::GeneralResult<OptionalTimePoint> convert(const nn::OptionalTimePoint& optionalTimePoint);
+nn::GeneralResult<OptionalTimeoutDuration> convert(
         const nn::OptionalTimeoutDuration& optionalTimeoutDuration);
-nn::Result<ErrorStatus> convert(const nn::ErrorStatus& errorStatus);
+nn::GeneralResult<ErrorStatus> convert(const nn::ErrorStatus& errorStatus);
 
-nn::Result<hidl_vec<BufferRole>> convert(const std::vector<nn::BufferRole>& bufferRoles);
+nn::GeneralResult<hidl_vec<BufferRole>> convert(const std::vector<nn::BufferRole>& bufferRoles);
 
 }  // namespace android::hardware::neuralnetworks::V1_3::utils
 
diff --git a/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/Device.h b/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/Device.h
new file mode 100644
index 0000000..2f6c46a
--- /dev/null
+++ b/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/Device.h
@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_DEVICE_H
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_DEVICE_H
+
+#include <android/hardware/neuralnetworks/1.3/IDevice.h>
+#include <nnapi/IBuffer.h>
+#include <nnapi/IDevice.h>
+#include <nnapi/OperandTypes.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/CommonUtils.h>
+#include <nnapi/hal/ProtectCallback.h>
+
+#include <functional>
+#include <memory>
+#include <optional>
+#include <string>
+#include <vector>
+
+namespace android::hardware::neuralnetworks::V1_3::utils {
+
+class Device final : public nn::IDevice {
+    struct PrivateConstructorTag {};
+
+  public:
+    static nn::GeneralResult<std::shared_ptr<const Device>> create(std::string name,
+                                                                   sp<V1_3::IDevice> device);
+
+    Device(PrivateConstructorTag tag, std::string name, std::string versionString,
+           nn::DeviceType deviceType, std::vector<nn::Extension> extensions,
+           nn::Capabilities capabilities, std::pair<uint32_t, uint32_t> numberOfCacheFilesNeeded,
+           sp<V1_3::IDevice> device, hal::utils::DeathHandler deathHandler);
+
+    const std::string& getName() const override;
+    const std::string& getVersionString() const override;
+    nn::Version getFeatureLevel() const override;
+    nn::DeviceType getType() const override;
+    const std::vector<nn::Extension>& getSupportedExtensions() const override;
+    const nn::Capabilities& getCapabilities() const override;
+    std::pair<uint32_t, uint32_t> getNumberOfCacheFilesNeeded() const override;
+
+    nn::GeneralResult<void> wait() const override;
+
+    nn::GeneralResult<std::vector<bool>> getSupportedOperations(
+            const nn::Model& model) const override;
+
+    nn::GeneralResult<nn::SharedPreparedModel> prepareModel(
+            const nn::Model& model, nn::ExecutionPreference preference, nn::Priority priority,
+            nn::OptionalTimePoint deadline, const std::vector<nn::NativeHandle>& modelCache,
+            const std::vector<nn::NativeHandle>& dataCache,
+            const nn::CacheToken& token) const override;
+
+    nn::GeneralResult<nn::SharedPreparedModel> prepareModelFromCache(
+            nn::OptionalTimePoint deadline, const std::vector<nn::NativeHandle>& modelCache,
+            const std::vector<nn::NativeHandle>& dataCache,
+            const nn::CacheToken& token) const override;
+
+    nn::GeneralResult<nn::SharedBuffer> allocate(
+            const nn::BufferDesc& desc, const std::vector<nn::SharedPreparedModel>& preparedModels,
+            const std::vector<nn::BufferRole>& inputRoles,
+            const std::vector<nn::BufferRole>& outputRoles) const override;
+
+  private:
+    const std::string kName;
+    const std::string kVersionString;
+    const nn::DeviceType kDeviceType;
+    const std::vector<nn::Extension> kExtensions;
+    const nn::Capabilities kCapabilities;
+    const std::pair<uint32_t, uint32_t> kNumberOfCacheFilesNeeded;
+    const sp<V1_3::IDevice> kDevice;
+    const hal::utils::DeathHandler kDeathHandler;
+};
+
+}  // namespace android::hardware::neuralnetworks::V1_3::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_DEVICE_H
diff --git a/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/PreparedModel.h b/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/PreparedModel.h
new file mode 100644
index 0000000..e0d69dd
--- /dev/null
+++ b/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/PreparedModel.h
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_PREPARED_MODEL_H
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_PREPARED_MODEL_H
+
+#include <android/hardware/neuralnetworks/1.3/IPreparedModel.h>
+#include <nnapi/IPreparedModel.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/CommonUtils.h>
+#include <nnapi/hal/ProtectCallback.h>
+
+#include <memory>
+#include <tuple>
+#include <utility>
+#include <vector>
+
+namespace android::hardware::neuralnetworks::V1_3::utils {
+
+class PreparedModel final : public nn::IPreparedModel {
+    struct PrivateConstructorTag {};
+
+  public:
+    static nn::GeneralResult<std::shared_ptr<const PreparedModel>> create(
+            sp<V1_3::IPreparedModel> preparedModel);
+
+    PreparedModel(PrivateConstructorTag tag, sp<V1_3::IPreparedModel> preparedModel,
+                  hal::utils::DeathHandler deathHandler);
+
+    nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>> execute(
+            const nn::Request& request, nn::MeasureTiming measure,
+            const nn::OptionalTimePoint& deadline,
+            const nn::OptionalTimeoutDuration& loopTimeoutDuration) const override;
+
+    nn::GeneralResult<std::pair<nn::SyncFence, nn::ExecuteFencedInfoCallback>> executeFenced(
+            const nn::Request& request, const std::vector<nn::SyncFence>& waitFor,
+            nn::MeasureTiming measure, const nn::OptionalTimePoint& deadline,
+            const nn::OptionalTimeoutDuration& loopTimeoutDuration,
+            const nn::OptionalTimeoutDuration& timeoutDurationAfterFence) const override;
+
+    std::any getUnderlyingResource() const override;
+
+  private:
+    nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>> executeSynchronously(
+            const Request& request, V1_2::MeasureTiming measure, const OptionalTimePoint& deadline,
+            const OptionalTimeoutDuration& loopTimeoutDuration) const;
+    nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>> executeAsynchronously(
+            const Request& request, V1_2::MeasureTiming measure, const OptionalTimePoint& deadline,
+            const OptionalTimeoutDuration& loopTimeoutDuration) const;
+
+    const sp<V1_3::IPreparedModel> kPreparedModel;
+    const hal::utils::DeathHandler kDeathHandler;
+};
+
+}  // namespace android::hardware::neuralnetworks::V1_3::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_PREPARED_MODEL_H
diff --git a/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/Service.h b/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/Service.h
new file mode 100644
index 0000000..2bc3257
--- /dev/null
+++ b/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/Service.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_SERVICE_H
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_SERVICE_H
+
+#include <nnapi/IDevice.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <string>
+
+namespace android::hardware::neuralnetworks::V1_3::utils {
+
+nn::GeneralResult<nn::SharedDevice> getDevice(const std::string& name);
+
+}  // namespace android::hardware::neuralnetworks::V1_3::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_1_3_UTILS_SERVICE_H
diff --git a/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/Utils.h b/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/Utils.h
index f8c975d..e61859d 100644
--- a/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/Utils.h
+++ b/neuralnetworks/1.3/utils/include/nnapi/hal/1.3/Utils.h
@@ -22,6 +22,7 @@
 #include <android-base/logging.h>
 #include <android/hardware/neuralnetworks/1.3/types.h>
 #include <nnapi/Result.h>
+#include <nnapi/TypeUtils.h>
 #include <nnapi/Types.h>
 #include <nnapi/Validation.h>
 #include <nnapi/hal/1.0/Conversions.h>
@@ -35,10 +36,14 @@
 
 template <typename Type>
 nn::Result<void> validate(const Type& halObject) {
-    const auto canonical = NN_TRY(nn::convert(halObject));
-    const auto version = NN_TRY(nn::validate(canonical));
+    const auto maybeCanonical = nn::convert(halObject);
+    if (!maybeCanonical.has_value()) {
+        return nn::error() << maybeCanonical.error().message;
+    }
+    const auto version = NN_TRY(nn::validate(maybeCanonical.value()));
     if (version > utils::kVersion) {
-        return NN_ERROR() << "";
+        return NN_ERROR() << "Insufficient version: " << version << " vs required "
+                          << utils::kVersion;
     }
     return {};
 }
@@ -55,9 +60,14 @@
 template <typename Type>
 decltype(nn::convert(std::declval<Type>())) validatedConvertToCanonical(const Type& halObject) {
     auto canonical = NN_TRY(nn::convert(halObject));
-    const auto version = NN_TRY(nn::validate(canonical));
+    const auto maybeVersion = nn::validate(canonical);
+    if (!maybeVersion.has_value()) {
+        return nn::error() << maybeVersion.error();
+    }
+    const auto version = maybeVersion.value();
     if (version > utils::kVersion) {
-        return NN_ERROR() << "";
+        return NN_ERROR() << "Insufficient version: " << version << " vs required "
+                          << utils::kVersion;
     }
     return canonical;
 }
diff --git a/neuralnetworks/1.3/utils/src/Buffer.cpp b/neuralnetworks/1.3/utils/src/Buffer.cpp
new file mode 100644
index 0000000..f3fe9b5
--- /dev/null
+++ b/neuralnetworks/1.3/utils/src/Buffer.cpp
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "Buffer.h"
+
+#include <android/hardware/neuralnetworks/1.0/types.h>
+#include <android/hardware/neuralnetworks/1.1/types.h>
+#include <android/hardware/neuralnetworks/1.2/types.h>
+#include <android/hardware/neuralnetworks/1.3/IBuffer.h>
+#include <android/hardware/neuralnetworks/1.3/types.h>
+#include <nnapi/IPreparedModel.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/1.0/Conversions.h>
+#include <nnapi/hal/HandleError.h>
+
+#include "Conversions.h"
+#include "Utils.h"
+
+#include <memory>
+#include <utility>
+
+namespace android::hardware::neuralnetworks::V1_3::utils {
+
+nn::GeneralResult<std::shared_ptr<const Buffer>> Buffer::create(
+        sp<V1_3::IBuffer> buffer, nn::Request::MemoryDomainToken token) {
+    if (buffer == nullptr) {
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "V1_3::utils::Buffer::create must have non-null buffer";
+    }
+    if (token == static_cast<nn::Request::MemoryDomainToken>(0)) {
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "V1_3::utils::Buffer::create must have non-zero token";
+    }
+
+    return std::make_shared<const Buffer>(PrivateConstructorTag{}, std::move(buffer), token);
+}
+
+Buffer::Buffer(PrivateConstructorTag /*tag*/, sp<V1_3::IBuffer> buffer,
+               nn::Request::MemoryDomainToken token)
+    : kBuffer(std::move(buffer)), kToken(token) {
+    CHECK(kBuffer != nullptr);
+    CHECK(kToken != static_cast<nn::Request::MemoryDomainToken>(0));
+}
+
+nn::Request::MemoryDomainToken Buffer::getToken() const {
+    return kToken;
+}
+
+nn::GeneralResult<void> Buffer::copyTo(const nn::Memory& dst) const {
+    const auto hidlDst = NN_TRY(V1_0::utils::convert(dst));
+
+    const auto ret = kBuffer->copyTo(hidlDst);
+    const auto status = NN_TRY(hal::utils::handleTransportError(ret));
+    if (status != ErrorStatus::NONE) {
+        const auto canonical =
+                validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+        return NN_ERROR(canonical) << "IBuffer::copyTo failed with " << toString(status);
+    }
+
+    return {};
+}
+
+nn::GeneralResult<void> Buffer::copyFrom(const nn::Memory& src,
+                                         const nn::Dimensions& dimensions) const {
+    const auto hidlSrc = NN_TRY(V1_0::utils::convert(src));
+    const auto hidlDimensions = hidl_vec<uint32_t>(dimensions);
+
+    const auto ret = kBuffer->copyFrom(hidlSrc, hidlDimensions);
+    const auto status = NN_TRY(hal::utils::handleTransportError(ret));
+    if (status != ErrorStatus::NONE) {
+        const auto canonical =
+                validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+        return NN_ERROR(canonical) << "IBuffer::copyFrom failed with " << toString(status);
+    }
+
+    return {};
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_3::utils
diff --git a/neuralnetworks/1.3/utils/src/Callbacks.cpp b/neuralnetworks/1.3/utils/src/Callbacks.cpp
new file mode 100644
index 0000000..ff81275
--- /dev/null
+++ b/neuralnetworks/1.3/utils/src/Callbacks.cpp
@@ -0,0 +1,184 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "Callbacks.h"
+
+#include "Conversions.h"
+#include "PreparedModel.h"
+#include "Utils.h"
+
+#include <android/hardware/neuralnetworks/1.0/types.h>
+#include <android/hardware/neuralnetworks/1.2/types.h>
+#include <android/hardware/neuralnetworks/1.3/IExecutionCallback.h>
+#include <android/hardware/neuralnetworks/1.3/IPreparedModelCallback.h>
+#include <android/hardware/neuralnetworks/1.3/types.h>
+#include <nnapi/IPreparedModel.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/1.0/Conversions.h>
+#include <nnapi/hal/1.0/PreparedModel.h>
+#include <nnapi/hal/1.2/Conversions.h>
+#include <nnapi/hal/1.2/PreparedModel.h>
+#include <nnapi/hal/CommonUtils.h>
+#include <nnapi/hal/HandleError.h>
+#include <nnapi/hal/ProtectCallback.h>
+#include <nnapi/hal/TransferValue.h>
+
+#include <utility>
+
+namespace android::hardware::neuralnetworks::V1_3::utils {
+namespace {
+
+nn::GeneralResult<nn::SharedPreparedModel> convertPreparedModel(
+        const sp<V1_0::IPreparedModel>& preparedModel) {
+    return NN_TRY(V1_0::utils::PreparedModel::create(preparedModel));
+}
+
+nn::GeneralResult<nn::SharedPreparedModel> convertPreparedModel(
+        const sp<V1_2::IPreparedModel>& preparedModel) {
+    return NN_TRY(V1_2::utils::PreparedModel::create(preparedModel));
+}
+
+nn::GeneralResult<nn::SharedPreparedModel> convertPreparedModel(
+        const sp<IPreparedModel>& preparedModel) {
+    return NN_TRY(utils::PreparedModel::create(preparedModel));
+}
+
+nn::GeneralResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>>
+convertExecutionGeneralResultsHelper(const hidl_vec<V1_2::OutputShape>& outputShapes,
+                                     const V1_2::Timing& timing) {
+    return std::make_pair(NN_TRY(validatedConvertToCanonical(outputShapes)),
+                          NN_TRY(validatedConvertToCanonical(timing)));
+}
+
+nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>>
+convertExecutionGeneralResults(const hidl_vec<V1_2::OutputShape>& outputShapes,
+                               const V1_2::Timing& timing) {
+    return hal::utils::makeExecutionFailure(
+            convertExecutionGeneralResultsHelper(outputShapes, timing));
+}
+
+}  // namespace
+
+Return<void> PreparedModelCallback::notify(V1_0::ErrorStatus status,
+                                           const sp<V1_0::IPreparedModel>& preparedModel) {
+    if (status != V1_0::ErrorStatus::NONE) {
+        const auto canonical =
+                validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+        notifyInternal(NN_ERROR(canonical) << "preparedModel failed with " << toString(status));
+    } else if (preparedModel == nullptr) {
+        notifyInternal(NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+                       << "Returned preparedModel is nullptr");
+    } else {
+        notifyInternal(convertPreparedModel(preparedModel));
+    }
+    return Void();
+}
+
+Return<void> PreparedModelCallback::notify_1_2(V1_0::ErrorStatus status,
+                                               const sp<V1_2::IPreparedModel>& preparedModel) {
+    if (status != V1_0::ErrorStatus::NONE) {
+        const auto canonical =
+                validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+        notifyInternal(NN_ERROR(canonical) << "preparedModel failed with " << toString(status));
+    } else if (preparedModel == nullptr) {
+        notifyInternal(NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+                       << "Returned preparedModel is nullptr");
+    } else {
+        notifyInternal(convertPreparedModel(preparedModel));
+    }
+    return Void();
+}
+
+Return<void> PreparedModelCallback::notify_1_3(ErrorStatus status,
+                                               const sp<IPreparedModel>& preparedModel) {
+    if (status != ErrorStatus::NONE) {
+        const auto canonical =
+                validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+        notifyInternal(NN_ERROR(canonical) << "preparedModel failed with " << toString(status));
+    } else if (preparedModel == nullptr) {
+        notifyInternal(NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+                       << "Returned preparedModel is nullptr");
+    } else {
+        notifyInternal(convertPreparedModel(preparedModel));
+    }
+    return Void();
+}
+
+void PreparedModelCallback::notifyAsDeadObject() {
+    notifyInternal(NN_ERROR(nn::ErrorStatus::DEAD_OBJECT) << "Dead object");
+}
+
+PreparedModelCallback::Data PreparedModelCallback::get() {
+    return mData.take();
+}
+
+void PreparedModelCallback::notifyInternal(PreparedModelCallback::Data result) {
+    mData.put(std::move(result));
+}
+
+// ExecutionCallback methods begin here
+
+Return<void> ExecutionCallback::notify(V1_0::ErrorStatus status) {
+    if (status != V1_0::ErrorStatus::NONE) {
+        const auto canonical =
+                validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+        notifyInternal(NN_ERROR(canonical) << "execute failed with " << toString(status));
+    } else {
+        notifyInternal({});
+    }
+    return Void();
+}
+
+Return<void> ExecutionCallback::notify_1_2(V1_0::ErrorStatus status,
+                                           const hidl_vec<V1_2::OutputShape>& outputShapes,
+                                           const V1_2::Timing& timing) {
+    if (status != V1_0::ErrorStatus::NONE) {
+        const auto canonical =
+                validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+        notifyInternal(NN_ERROR(canonical) << "execute failed with " << toString(status));
+    } else {
+        notifyInternal(convertExecutionGeneralResults(outputShapes, timing));
+    }
+    return Void();
+}
+
+Return<void> ExecutionCallback::notify_1_3(ErrorStatus status,
+                                           const hidl_vec<V1_2::OutputShape>& outputShapes,
+                                           const V1_2::Timing& timing) {
+    if (status != ErrorStatus::NONE) {
+        const auto canonical =
+                validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+        notifyInternal(NN_ERROR(canonical) << "execute failed with " << toString(status));
+    } else {
+        notifyInternal(convertExecutionGeneralResults(outputShapes, timing));
+    }
+    return Void();
+}
+
+void ExecutionCallback::notifyAsDeadObject() {
+    notifyInternal(NN_ERROR(nn::ErrorStatus::DEAD_OBJECT) << "Dead object");
+}
+
+ExecutionCallback::Data ExecutionCallback::get() {
+    return mData.take();
+}
+
+void ExecutionCallback::notifyInternal(ExecutionCallback::Data result) {
+    mData.put(std::move(result));
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_3::utils
diff --git a/neuralnetworks/1.3/utils/src/Conversions.cpp b/neuralnetworks/1.3/utils/src/Conversions.cpp
index 4c54e3b..0dc0785 100644
--- a/neuralnetworks/1.3/utils/src/Conversions.cpp
+++ b/neuralnetworks/1.3/utils/src/Conversions.cpp
@@ -27,6 +27,7 @@
 #include <nnapi/hal/1.0/Conversions.h>
 #include <nnapi/hal/1.2/Conversions.h>
 #include <nnapi/hal/CommonUtils.h>
+#include <nnapi/hal/HandleError.h>
 
 #include <algorithm>
 #include <chrono>
@@ -79,7 +80,7 @@
 using ConvertOutput = std::decay_t<decltype(convert(std::declval<Input>()).value())>;
 
 template <typename Type>
-Result<std::vector<ConvertOutput<Type>>> convertVec(const hidl_vec<Type>& arguments) {
+GeneralResult<std::vector<ConvertOutput<Type>>> convertVec(const hidl_vec<Type>& arguments) {
     std::vector<ConvertOutput<Type>> canonical;
     canonical.reserve(arguments.size());
     for (const auto& argument : arguments) {
@@ -89,25 +90,25 @@
 }
 
 template <typename Type>
-Result<std::vector<ConvertOutput<Type>>> convert(const hidl_vec<Type>& arguments) {
+GeneralResult<std::vector<ConvertOutput<Type>>> convert(const hidl_vec<Type>& arguments) {
     return convertVec(arguments);
 }
 
 }  // anonymous namespace
 
-Result<OperandType> convert(const hal::V1_3::OperandType& operandType) {
+GeneralResult<OperandType> convert(const hal::V1_3::OperandType& operandType) {
     return static_cast<OperandType>(operandType);
 }
 
-Result<OperationType> convert(const hal::V1_3::OperationType& operationType) {
+GeneralResult<OperationType> convert(const hal::V1_3::OperationType& operationType) {
     return static_cast<OperationType>(operationType);
 }
 
-Result<Priority> convert(const hal::V1_3::Priority& priority) {
+GeneralResult<Priority> convert(const hal::V1_3::Priority& priority) {
     return static_cast<Priority>(priority);
 }
 
-Result<Capabilities> convert(const hal::V1_3::Capabilities& capabilities) {
+GeneralResult<Capabilities> convert(const hal::V1_3::Capabilities& capabilities) {
     const bool validOperandTypes = std::all_of(
             capabilities.operandPerformance.begin(), capabilities.operandPerformance.end(),
             [](const hal::V1_3::Capabilities::OperandPerformance& operandPerformance) {
@@ -115,13 +116,14 @@
                 return !maybeType.has_value() ? false : validOperandType(maybeType.value());
             });
     if (!validOperandTypes) {
-        return NN_ERROR()
+        return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
                << "Invalid OperandType when converting OperandPerformance in Capabilities";
     }
 
     auto operandPerformance = NN_TRY(convert(capabilities.operandPerformance));
-    auto table =
-            NN_TRY(Capabilities::OperandPerformanceTable::create(std::move(operandPerformance)));
+    auto table = NN_TRY(hal::utils::makeGeneralFailure(
+            Capabilities::OperandPerformanceTable::create(std::move(operandPerformance)),
+            nn::ErrorStatus::GENERAL_FAILURE));
 
     return Capabilities{
             .relaxedFloat32toFloat16PerformanceScalar =
@@ -134,7 +136,7 @@
     };
 }
 
-Result<Capabilities::OperandPerformance> convert(
+GeneralResult<Capabilities::OperandPerformance> convert(
         const hal::V1_3::Capabilities::OperandPerformance& operandPerformance) {
     return Capabilities::OperandPerformance{
             .type = NN_TRY(convert(operandPerformance.type)),
@@ -142,7 +144,7 @@
     };
 }
 
-Result<Operation> convert(const hal::V1_3::Operation& operation) {
+GeneralResult<Operation> convert(const hal::V1_3::Operation& operation) {
     return Operation{
             .type = NN_TRY(convert(operation.type)),
             .inputs = operation.inputs,
@@ -150,11 +152,11 @@
     };
 }
 
-Result<Operand::LifeTime> convert(const hal::V1_3::OperandLifeTime& operandLifeTime) {
+GeneralResult<Operand::LifeTime> convert(const hal::V1_3::OperandLifeTime& operandLifeTime) {
     return static_cast<Operand::LifeTime>(operandLifeTime);
 }
 
-Result<Operand> convert(const hal::V1_3::Operand& operand) {
+GeneralResult<Operand> convert(const hal::V1_3::Operand& operand) {
     return Operand{
             .type = NN_TRY(convert(operand.type)),
             .dimensions = operand.dimensions,
@@ -166,7 +168,7 @@
     };
 }
 
-Result<Model> convert(const hal::V1_3::Model& model) {
+GeneralResult<Model> convert(const hal::V1_3::Model& model) {
     return Model{
             .main = NN_TRY(convert(model.main)),
             .referenced = NN_TRY(convert(model.referenced)),
@@ -177,7 +179,7 @@
     };
 }
 
-Result<Model::Subgraph> convert(const hal::V1_3::Subgraph& subgraph) {
+GeneralResult<Model::Subgraph> convert(const hal::V1_3::Subgraph& subgraph) {
     auto operations = NN_TRY(convert(subgraph.operations));
 
     // Verify number of consumers.
@@ -186,9 +188,10 @@
     CHECK(subgraph.operands.size() == numberOfConsumers.size());
     for (size_t i = 0; i < subgraph.operands.size(); ++i) {
         if (subgraph.operands[i].numberOfConsumers != numberOfConsumers[i]) {
-            return NN_ERROR() << "Invalid numberOfConsumers for operand " << i << ", expected "
-                              << numberOfConsumers[i] << " but found "
-                              << subgraph.operands[i].numberOfConsumers;
+            return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+                   << "Invalid numberOfConsumers for operand " << i << ", expected "
+                   << numberOfConsumers[i] << " but found "
+                   << subgraph.operands[i].numberOfConsumers;
         }
     }
 
@@ -200,11 +203,11 @@
     };
 }
 
-Result<BufferDesc> convert(const hal::V1_3::BufferDesc& bufferDesc) {
+GeneralResult<BufferDesc> convert(const hal::V1_3::BufferDesc& bufferDesc) {
     return BufferDesc{.dimensions = bufferDesc.dimensions};
 }
 
-Result<BufferRole> convert(const hal::V1_3::BufferRole& bufferRole) {
+GeneralResult<BufferRole> convert(const hal::V1_3::BufferRole& bufferRole) {
     return BufferRole{
             .modelIndex = bufferRole.modelIndex,
             .ioIndex = bufferRole.ioIndex,
@@ -212,7 +215,7 @@
     };
 }
 
-Result<Request> convert(const hal::V1_3::Request& request) {
+GeneralResult<Request> convert(const hal::V1_3::Request& request) {
     return Request{
             .inputs = NN_TRY(convert(request.inputs)),
             .outputs = NN_TRY(convert(request.outputs)),
@@ -220,7 +223,7 @@
     };
 }
 
-Result<Request::MemoryPool> convert(const hal::V1_3::Request::MemoryPool& memoryPool) {
+GeneralResult<Request::MemoryPool> convert(const hal::V1_3::Request::MemoryPool& memoryPool) {
     using Discriminator = hal::V1_3::Request::MemoryPool::hidl_discriminator;
     switch (memoryPool.getDiscriminator()) {
         case Discriminator::hidlMemory:
@@ -228,15 +231,16 @@
         case Discriminator::token:
             return static_cast<Request::MemoryDomainToken>(memoryPool.token());
     }
-    return NN_ERROR() << "Invalid Request::MemoryPool discriminator "
-                      << underlyingType(memoryPool.getDiscriminator());
+    return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+           << "Invalid Request::MemoryPool discriminator "
+           << underlyingType(memoryPool.getDiscriminator());
 }
 
-Result<OptionalTimePoint> convert(const hal::V1_3::OptionalTimePoint& optionalTimePoint) {
+GeneralResult<OptionalTimePoint> convert(const hal::V1_3::OptionalTimePoint& optionalTimePoint) {
     constexpr auto kTimePointMaxCount = TimePoint::max().time_since_epoch().count();
-    const auto makeTimePoint = [](uint64_t count) -> Result<OptionalTimePoint> {
+    const auto makeTimePoint = [](uint64_t count) -> GeneralResult<OptionalTimePoint> {
         if (count > kTimePointMaxCount) {
-            return NN_ERROR()
+            return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
                    << "Unable to convert OptionalTimePoint because the count exceeds the max";
         }
         const auto nanoseconds = std::chrono::nanoseconds{count};
@@ -250,16 +254,17 @@
         case Discriminator::nanosecondsSinceEpoch:
             return makeTimePoint(optionalTimePoint.nanosecondsSinceEpoch());
     }
-    return NN_ERROR() << "Invalid OptionalTimePoint discriminator "
-                      << underlyingType(optionalTimePoint.getDiscriminator());
+    return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+           << "Invalid OptionalTimePoint discriminator "
+           << underlyingType(optionalTimePoint.getDiscriminator());
 }
 
-Result<OptionalTimeoutDuration> convert(
+GeneralResult<OptionalTimeoutDuration> convert(
         const hal::V1_3::OptionalTimeoutDuration& optionalTimeoutDuration) {
     constexpr auto kTimeoutDurationMaxCount = TimeoutDuration::max().count();
-    const auto makeTimeoutDuration = [](uint64_t count) -> Result<OptionalTimeoutDuration> {
+    const auto makeTimeoutDuration = [](uint64_t count) -> GeneralResult<OptionalTimeoutDuration> {
         if (count > kTimeoutDurationMaxCount) {
-            return NN_ERROR()
+            return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
                    << "Unable to convert OptionalTimeoutDuration because the count exceeds the max";
         }
         return TimeoutDuration{count};
@@ -272,11 +277,12 @@
         case Discriminator::nanoseconds:
             return makeTimeoutDuration(optionalTimeoutDuration.nanoseconds());
     }
-    return NN_ERROR() << "Invalid OptionalTimeoutDuration discriminator "
-                      << underlyingType(optionalTimeoutDuration.getDiscriminator());
+    return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+           << "Invalid OptionalTimeoutDuration discriminator "
+           << underlyingType(optionalTimeoutDuration.getDiscriminator());
 }
 
-Result<ErrorStatus> convert(const hal::V1_3::ErrorStatus& status) {
+GeneralResult<ErrorStatus> convert(const hal::V1_3::ErrorStatus& status) {
     switch (status) {
         case hal::V1_3::ErrorStatus::NONE:
         case hal::V1_3::ErrorStatus::DEVICE_UNAVAILABLE:
@@ -289,10 +295,11 @@
         case hal::V1_3::ErrorStatus::RESOURCE_EXHAUSTED_PERSISTENT:
             return static_cast<ErrorStatus>(status);
     }
-    return NN_ERROR() << "Invalid ErrorStatus " << underlyingType(status);
+    return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+           << "Invalid ErrorStatus " << underlyingType(status);
 }
 
-Result<std::vector<BufferRole>> convert(
+GeneralResult<std::vector<BufferRole>> convert(
         const hardware::hidl_vec<hal::V1_3::BufferRole>& bufferRoles) {
     return convertVec(bufferRoles);
 }
@@ -304,32 +311,32 @@
 
 using utils::convert;
 
-nn::Result<V1_0::PerformanceInfo> convert(
+nn::GeneralResult<V1_0::PerformanceInfo> convert(
         const nn::Capabilities::PerformanceInfo& performanceInfo) {
     return V1_0::utils::convert(performanceInfo);
 }
 
-nn::Result<V1_0::DataLocation> convert(const nn::DataLocation& dataLocation) {
+nn::GeneralResult<V1_0::DataLocation> convert(const nn::DataLocation& dataLocation) {
     return V1_0::utils::convert(dataLocation);
 }
 
-nn::Result<hidl_vec<uint8_t>> convert(const nn::Model::OperandValues& operandValues) {
+nn::GeneralResult<hidl_vec<uint8_t>> convert(const nn::Model::OperandValues& operandValues) {
     return V1_0::utils::convert(operandValues);
 }
 
-nn::Result<hidl_memory> convert(const nn::Memory& memory) {
+nn::GeneralResult<hidl_memory> convert(const nn::Memory& memory) {
     return V1_0::utils::convert(memory);
 }
 
-nn::Result<V1_0::RequestArgument> convert(const nn::Request::Argument& argument) {
+nn::GeneralResult<V1_0::RequestArgument> convert(const nn::Request::Argument& argument) {
     return V1_0::utils::convert(argument);
 }
 
-nn::Result<V1_2::Operand::ExtraParams> convert(const nn::Operand::ExtraParams& extraParams) {
+nn::GeneralResult<V1_2::Operand::ExtraParams> convert(const nn::Operand::ExtraParams& extraParams) {
     return V1_2::utils::convert(extraParams);
 }
 
-nn::Result<V1_2::Model::ExtensionNameAndPrefix> convert(
+nn::GeneralResult<V1_2::Model::ExtensionNameAndPrefix> convert(
         const nn::Model::ExtensionNameAndPrefix& extensionNameAndPrefix) {
     return V1_2::utils::convert(extensionNameAndPrefix);
 }
@@ -338,7 +345,7 @@
 using ConvertOutput = std::decay_t<decltype(convert(std::declval<Input>()).value())>;
 
 template <typename Type>
-nn::Result<hidl_vec<ConvertOutput<Type>>> convertVec(const std::vector<Type>& arguments) {
+nn::GeneralResult<hidl_vec<ConvertOutput<Type>>> convertVec(const std::vector<Type>& arguments) {
     hidl_vec<ConvertOutput<Type>> halObject(arguments.size());
     for (size_t i = 0; i < arguments.size(); ++i) {
         halObject[i] = NN_TRY(convert(arguments[i]));
@@ -347,42 +354,41 @@
 }
 
 template <typename Type>
-nn::Result<hidl_vec<ConvertOutput<Type>>> convert(const std::vector<Type>& arguments) {
+nn::GeneralResult<hidl_vec<ConvertOutput<Type>>> convert(const std::vector<Type>& arguments) {
     return convertVec(arguments);
 }
 
-nn::Result<Request::MemoryPool> makeMemoryPool(const nn::Memory& memory) {
+nn::GeneralResult<Request::MemoryPool> makeMemoryPool(const nn::Memory& memory) {
     Request::MemoryPool ret;
     ret.hidlMemory(NN_TRY(convert(memory)));
     return ret;
 }
 
-nn::Result<Request::MemoryPool> makeMemoryPool(const nn::Request::MemoryDomainToken& token) {
+nn::GeneralResult<Request::MemoryPool> makeMemoryPool(const nn::Request::MemoryDomainToken& token) {
     Request::MemoryPool ret;
     ret.token(underlyingType(token));
     return ret;
 }
 
-nn::Result<Request::MemoryPool> makeMemoryPool(
-        const std::shared_ptr<const nn::IBuffer>& /*buffer*/) {
-    return NN_ERROR() << "Unable to make memory pool from IBuffer";
+nn::GeneralResult<Request::MemoryPool> makeMemoryPool(const nn::SharedBuffer& /*buffer*/) {
+    return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE) << "Unable to make memory pool from IBuffer";
 }
 
 }  // anonymous namespace
 
-nn::Result<OperandType> convert(const nn::OperandType& operandType) {
+nn::GeneralResult<OperandType> convert(const nn::OperandType& operandType) {
     return static_cast<OperandType>(operandType);
 }
 
-nn::Result<OperationType> convert(const nn::OperationType& operationType) {
+nn::GeneralResult<OperationType> convert(const nn::OperationType& operationType) {
     return static_cast<OperationType>(operationType);
 }
 
-nn::Result<Priority> convert(const nn::Priority& priority) {
+nn::GeneralResult<Priority> convert(const nn::Priority& priority) {
     return static_cast<Priority>(priority);
 }
 
-nn::Result<Capabilities> convert(const nn::Capabilities& capabilities) {
+nn::GeneralResult<Capabilities> convert(const nn::Capabilities& capabilities) {
     std::vector<nn::Capabilities::OperandPerformance> operandPerformance;
     operandPerformance.reserve(capabilities.operandPerformance.asVector().size());
     std::copy_if(capabilities.operandPerformance.asVector().begin(),
@@ -403,7 +409,7 @@
     };
 }
 
-nn::Result<Capabilities::OperandPerformance> convert(
+nn::GeneralResult<Capabilities::OperandPerformance> convert(
         const nn::Capabilities::OperandPerformance& operandPerformance) {
     return Capabilities::OperandPerformance{
             .type = NN_TRY(convert(operandPerformance.type)),
@@ -411,7 +417,7 @@
     };
 }
 
-nn::Result<Operation> convert(const nn::Operation& operation) {
+nn::GeneralResult<Operation> convert(const nn::Operation& operation) {
     return Operation{
             .type = NN_TRY(convert(operation.type)),
             .inputs = operation.inputs,
@@ -419,14 +425,15 @@
     };
 }
 
-nn::Result<OperandLifeTime> convert(const nn::Operand::LifeTime& operandLifeTime) {
+nn::GeneralResult<OperandLifeTime> convert(const nn::Operand::LifeTime& operandLifeTime) {
     if (operandLifeTime == nn::Operand::LifeTime::POINTER) {
-        return NN_ERROR() << "Model cannot be converted because it contains pointer-based memory";
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "Model cannot be converted because it contains pointer-based memory";
     }
     return static_cast<OperandLifeTime>(operandLifeTime);
 }
 
-nn::Result<Operand> convert(const nn::Operand& operand) {
+nn::GeneralResult<Operand> convert(const nn::Operand& operand) {
     return Operand{
             .type = NN_TRY(convert(operand.type)),
             .dimensions = operand.dimensions,
@@ -439,9 +446,10 @@
     };
 }
 
-nn::Result<Model> convert(const nn::Model& model) {
+nn::GeneralResult<Model> convert(const nn::Model& model) {
     if (!hal::utils::hasNoPointerData(model)) {
-        return NN_ERROR() << "Model cannot be converted because it contains pointer-based memory";
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "Model cannot be converted because it contains pointer-based memory";
     }
 
     return Model{
@@ -454,7 +462,7 @@
     };
 }
 
-nn::Result<Subgraph> convert(const nn::Model::Subgraph& subgraph) {
+nn::GeneralResult<Subgraph> convert(const nn::Model::Subgraph& subgraph) {
     auto operands = NN_TRY(convert(subgraph.operands));
 
     // Update number of consumers.
@@ -473,11 +481,11 @@
     };
 }
 
-nn::Result<BufferDesc> convert(const nn::BufferDesc& bufferDesc) {
+nn::GeneralResult<BufferDesc> convert(const nn::BufferDesc& bufferDesc) {
     return BufferDesc{.dimensions = bufferDesc.dimensions};
 }
 
-nn::Result<BufferRole> convert(const nn::BufferRole& bufferRole) {
+nn::GeneralResult<BufferRole> convert(const nn::BufferRole& bufferRole) {
     return BufferRole{
             .modelIndex = bufferRole.modelIndex,
             .ioIndex = bufferRole.ioIndex,
@@ -485,9 +493,10 @@
     };
 }
 
-nn::Result<Request> convert(const nn::Request& request) {
+nn::GeneralResult<Request> convert(const nn::Request& request) {
     if (!hal::utils::hasNoPointerData(request)) {
-        return NN_ERROR() << "Request cannot be converted because it contains pointer-based memory";
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "Request cannot be converted because it contains pointer-based memory";
     }
 
     return Request{
@@ -497,30 +506,31 @@
     };
 }
 
-nn::Result<Request::MemoryPool> convert(const nn::Request::MemoryPool& memoryPool) {
+nn::GeneralResult<Request::MemoryPool> convert(const nn::Request::MemoryPool& memoryPool) {
     return std::visit([](const auto& o) { return makeMemoryPool(o); }, memoryPool);
 }
 
-nn::Result<OptionalTimePoint> convert(const nn::OptionalTimePoint& optionalTimePoint) {
+nn::GeneralResult<OptionalTimePoint> convert(const nn::OptionalTimePoint& optionalTimePoint) {
     OptionalTimePoint ret;
     if (optionalTimePoint.has_value()) {
         const auto count = optionalTimePoint.value().time_since_epoch().count();
         if (count < 0) {
-            return NN_ERROR() << "Unable to convert OptionalTimePoint because time since epoch "
-                                 "count is negative";
+            return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+                   << "Unable to convert OptionalTimePoint because time since epoch count is "
+                      "negative";
         }
         ret.nanosecondsSinceEpoch(count);
     }
     return ret;
 }
 
-nn::Result<OptionalTimeoutDuration> convert(
+nn::GeneralResult<OptionalTimeoutDuration> convert(
         const nn::OptionalTimeoutDuration& optionalTimeoutDuration) {
     OptionalTimeoutDuration ret;
     if (optionalTimeoutDuration.has_value()) {
         const auto count = optionalTimeoutDuration.value().count();
         if (count < 0) {
-            return NN_ERROR()
+            return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
                    << "Unable to convert OptionalTimeoutDuration because count is negative";
         }
         ret.nanoseconds(count);
@@ -528,7 +538,7 @@
     return ret;
 }
 
-nn::Result<ErrorStatus> convert(const nn::ErrorStatus& errorStatus) {
+nn::GeneralResult<ErrorStatus> convert(const nn::ErrorStatus& errorStatus) {
     switch (errorStatus) {
         case nn::ErrorStatus::NONE:
         case nn::ErrorStatus::DEVICE_UNAVAILABLE:
@@ -545,7 +555,7 @@
     }
 }
 
-nn::Result<hidl_vec<BufferRole>> convert(const std::vector<nn::BufferRole>& bufferRoles) {
+nn::GeneralResult<hidl_vec<BufferRole>> convert(const std::vector<nn::BufferRole>& bufferRoles) {
     return convertVec(bufferRoles);
 }
 
diff --git a/neuralnetworks/1.3/utils/src/Device.cpp b/neuralnetworks/1.3/utils/src/Device.cpp
new file mode 100644
index 0000000..c215f39
--- /dev/null
+++ b/neuralnetworks/1.3/utils/src/Device.cpp
@@ -0,0 +1,269 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "Device.h"
+
+#include "Buffer.h"
+#include "Callbacks.h"
+#include "Conversions.h"
+#include "PreparedModel.h"
+#include "Utils.h"
+
+#include <android/hardware/neuralnetworks/1.0/types.h>
+#include <android/hardware/neuralnetworks/1.1/types.h>
+#include <android/hardware/neuralnetworks/1.2/types.h>
+#include <android/hardware/neuralnetworks/1.3/IDevice.h>
+#include <android/hardware/neuralnetworks/1.3/types.h>
+#include <nnapi/IBuffer.h>
+#include <nnapi/IDevice.h>
+#include <nnapi/IPreparedModel.h>
+#include <nnapi/OperandTypes.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/1.1/Conversions.h>
+#include <nnapi/hal/1.2/Conversions.h>
+#include <nnapi/hal/1.2/Device.h>
+#include <nnapi/hal/CommonUtils.h>
+#include <nnapi/hal/HandleError.h>
+#include <nnapi/hal/ProtectCallback.h>
+
+#include <any>
+#include <functional>
+#include <memory>
+#include <optional>
+#include <string>
+#include <vector>
+
+namespace android::hardware::neuralnetworks::V1_3::utils {
+namespace {
+
+nn::GeneralResult<hidl_vec<sp<IPreparedModel>>> convert(
+        const std::vector<nn::SharedPreparedModel>& preparedModels) {
+    hidl_vec<sp<IPreparedModel>> hidlPreparedModels(preparedModels.size());
+    for (size_t i = 0; i < preparedModels.size(); ++i) {
+        std::any underlyingResource = preparedModels[i]->getUnderlyingResource();
+        if (const auto* hidlPreparedModel =
+                    std::any_cast<sp<IPreparedModel>>(&underlyingResource)) {
+            hidlPreparedModels[i] = *hidlPreparedModel;
+        } else {
+            return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+                   << "Unable to convert from nn::IPreparedModel to V1_3::IPreparedModel";
+        }
+    }
+    return hidlPreparedModels;
+}
+
+nn::GeneralResult<nn::SharedBuffer> convert(
+        nn::GeneralResult<std::shared_ptr<const Buffer>> result) {
+    return NN_TRY(std::move(result));
+}
+
+}  // namespace
+
+nn::GeneralResult<std::shared_ptr<const Device>> Device::create(std::string name,
+                                                                sp<V1_3::IDevice> device) {
+    if (name.empty()) {
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "V1_3::utils::Device::create must have non-empty name";
+    }
+    if (device == nullptr) {
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "V1_3::utils::Device::create must have non-null device";
+    }
+
+    auto versionString = NN_TRY(V1_2::utils::initVersionString(device.get()));
+    const auto deviceType = NN_TRY(V1_2::utils::initDeviceType(device.get()));
+    auto extensions = NN_TRY(V1_2::utils::initExtensions(device.get()));
+    auto capabilities = NN_TRY(V1_2::utils::initCapabilities(device.get()));
+    const auto numberOfCacheFilesNeeded =
+            NN_TRY(V1_2::utils::initNumberOfCacheFilesNeeded(device.get()));
+
+    auto deathHandler = NN_TRY(hal::utils::DeathHandler::create(device));
+    return std::make_shared<const Device>(
+            PrivateConstructorTag{}, std::move(name), std::move(versionString), deviceType,
+            std::move(extensions), std::move(capabilities), numberOfCacheFilesNeeded,
+            std::move(device), std::move(deathHandler));
+}
+
+Device::Device(PrivateConstructorTag /*tag*/, std::string name, std::string versionString,
+               nn::DeviceType deviceType, std::vector<nn::Extension> extensions,
+               nn::Capabilities capabilities,
+               std::pair<uint32_t, uint32_t> numberOfCacheFilesNeeded, sp<V1_3::IDevice> device,
+               hal::utils::DeathHandler deathHandler)
+    : kName(std::move(name)),
+      kVersionString(std::move(versionString)),
+      kDeviceType(deviceType),
+      kExtensions(std::move(extensions)),
+      kCapabilities(std::move(capabilities)),
+      kNumberOfCacheFilesNeeded(numberOfCacheFilesNeeded),
+      kDevice(std::move(device)),
+      kDeathHandler(std::move(deathHandler)) {}
+
+const std::string& Device::getName() const {
+    return kName;
+}
+
+const std::string& Device::getVersionString() const {
+    return kVersionString;
+}
+
+nn::Version Device::getFeatureLevel() const {
+    return nn::Version::ANDROID_R;
+}
+
+nn::DeviceType Device::getType() const {
+    return kDeviceType;
+}
+
+const std::vector<nn::Extension>& Device::getSupportedExtensions() const {
+    return kExtensions;
+}
+
+const nn::Capabilities& Device::getCapabilities() const {
+    return kCapabilities;
+}
+
+std::pair<uint32_t, uint32_t> Device::getNumberOfCacheFilesNeeded() const {
+    return kNumberOfCacheFilesNeeded;
+}
+
+nn::GeneralResult<void> Device::wait() const {
+    const auto ret = kDevice->ping();
+    return hal::utils::handleTransportError(ret);
+}
+
+nn::GeneralResult<std::vector<bool>> Device::getSupportedOperations(const nn::Model& model) const {
+    // Ensure that model is ready for IPC.
+    std::optional<nn::Model> maybeModelInShared;
+    const nn::Model& modelInShared =
+            NN_TRY(hal::utils::flushDataFromPointerToShared(&model, &maybeModelInShared));
+
+    const auto hidlModel = NN_TRY(convert(modelInShared));
+
+    nn::GeneralResult<std::vector<bool>> result = NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+                                                  << "uninitialized";
+    auto cb = [&result, &model](ErrorStatus status, const hidl_vec<bool>& supportedOperations) {
+        if (status != ErrorStatus::NONE) {
+            const auto canonical =
+                    validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+            result = NN_ERROR(canonical)
+                     << "IDevice::getSupportedOperations_1_3 failed with " << toString(status);
+        } else if (supportedOperations.size() != model.main.operations.size()) {
+            result = NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+                     << "IDevice::getSupportedOperations_1_3 returned vector of size "
+                     << supportedOperations.size() << " but expected "
+                     << model.main.operations.size();
+        } else {
+            result = supportedOperations;
+        }
+    };
+
+    const auto ret = kDevice->getSupportedOperations_1_3(hidlModel, cb);
+    NN_TRY(hal::utils::handleTransportError(ret));
+
+    return result;
+}
+
+nn::GeneralResult<nn::SharedPreparedModel> Device::prepareModel(
+        const nn::Model& model, nn::ExecutionPreference preference, nn::Priority priority,
+        nn::OptionalTimePoint deadline, const std::vector<nn::NativeHandle>& modelCache,
+        const std::vector<nn::NativeHandle>& dataCache, const nn::CacheToken& token) const {
+    // Ensure that model is ready for IPC.
+    std::optional<nn::Model> maybeModelInShared;
+    const nn::Model& modelInShared =
+            NN_TRY(hal::utils::flushDataFromPointerToShared(&model, &maybeModelInShared));
+
+    const auto hidlModel = NN_TRY(convert(modelInShared));
+    const auto hidlPreference = NN_TRY(V1_1::utils::convert(preference));
+    const auto hidlPriority = NN_TRY(convert(priority));
+    const auto hidlDeadline = NN_TRY(convert(deadline));
+    const auto hidlModelCache = NN_TRY(V1_2::utils::convert(modelCache));
+    const auto hidlDataCache = NN_TRY(V1_2::utils::convert(dataCache));
+    const auto hidlToken = token;
+
+    const auto cb = sp<PreparedModelCallback>::make();
+    const auto scoped = kDeathHandler.protectCallback(cb.get());
+
+    const auto ret =
+            kDevice->prepareModel_1_3(hidlModel, hidlPreference, hidlPriority, hidlDeadline,
+                                      hidlModelCache, hidlDataCache, hidlToken, cb);
+    const auto status = NN_TRY(hal::utils::handleTransportError(ret));
+    if (status != ErrorStatus::NONE) {
+        const auto canonical =
+                validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+        return NN_ERROR(canonical) << "prepareModel_1_3 failed with " << toString(status);
+    }
+
+    return cb->get();
+}
+
+nn::GeneralResult<nn::SharedPreparedModel> Device::prepareModelFromCache(
+        nn::OptionalTimePoint deadline, const std::vector<nn::NativeHandle>& modelCache,
+        const std::vector<nn::NativeHandle>& dataCache, const nn::CacheToken& token) const {
+    const auto hidlDeadline = NN_TRY(convert(deadline));
+    const auto hidlModelCache = NN_TRY(V1_2::utils::convert(modelCache));
+    const auto hidlDataCache = NN_TRY(V1_2::utils::convert(dataCache));
+    const auto hidlToken = token;
+
+    const auto cb = sp<PreparedModelCallback>::make();
+    const auto scoped = kDeathHandler.protectCallback(cb.get());
+
+    const auto ret = kDevice->prepareModelFromCache_1_3(hidlDeadline, hidlModelCache, hidlDataCache,
+                                                        hidlToken, cb);
+    const auto status = NN_TRY(hal::utils::handleTransportError(ret));
+    if (status != ErrorStatus::NONE) {
+        const auto canonical =
+                validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+        return NN_ERROR(canonical) << "prepareModelFromCache_1_3 failed with " << toString(status);
+    }
+
+    return cb->get();
+}
+
+nn::GeneralResult<nn::SharedBuffer> Device::allocate(
+        const nn::BufferDesc& desc, const std::vector<nn::SharedPreparedModel>& preparedModels,
+        const std::vector<nn::BufferRole>& inputRoles,
+        const std::vector<nn::BufferRole>& outputRoles) const {
+    const auto hidlDesc = NN_TRY(convert(desc));
+    const auto hidlPreparedModels = NN_TRY(convert(preparedModels));
+    const auto hidlInputRoles = NN_TRY(convert(inputRoles));
+    const auto hidlOutputRoles = NN_TRY(convert(outputRoles));
+
+    nn::GeneralResult<nn::SharedBuffer> result = NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+                                                 << "uninitialized";
+    auto cb = [&result](ErrorStatus status, const sp<IBuffer>& buffer, uint32_t token) {
+        if (status != ErrorStatus::NONE) {
+            const auto canonical =
+                    validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+            result = NN_ERROR(canonical) << "IDevice::allocate failed with " << toString(status);
+        } else if (buffer == nullptr) {
+            result = NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE) << "Returned buffer is nullptr";
+        } else if (token == 0) {
+            result = NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE) << "Returned token is invalid (0)";
+        } else {
+            result = convert(
+                    Buffer::create(buffer, static_cast<nn::Request::MemoryDomainToken>(token)));
+        }
+    };
+
+    const auto ret =
+            kDevice->allocate(hidlDesc, hidlPreparedModels, hidlInputRoles, hidlOutputRoles, cb);
+    NN_TRY(hal::utils::handleTransportError(ret));
+
+    return result;
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_3::utils
diff --git a/neuralnetworks/1.3/utils/src/PreparedModel.cpp b/neuralnetworks/1.3/utils/src/PreparedModel.cpp
new file mode 100644
index 0000000..df9b280
--- /dev/null
+++ b/neuralnetworks/1.3/utils/src/PreparedModel.cpp
@@ -0,0 +1,267 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "PreparedModel.h"
+
+#include "Callbacks.h"
+#include "Conversions.h"
+#include "Utils.h"
+
+#include <android/hardware/neuralnetworks/1.0/types.h>
+#include <android/hardware/neuralnetworks/1.1/types.h>
+#include <android/hardware/neuralnetworks/1.2/types.h>
+#include <android/hardware/neuralnetworks/1.3/IPreparedModel.h>
+#include <android/hardware/neuralnetworks/1.3/types.h>
+#include <nnapi/IPreparedModel.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/1.2/Conversions.h>
+#include <nnapi/hal/CommonUtils.h>
+#include <nnapi/hal/HandleError.h>
+#include <nnapi/hal/ProtectCallback.h>
+
+#include <memory>
+#include <tuple>
+#include <utility>
+#include <vector>
+
+namespace android::hardware::neuralnetworks::V1_3::utils {
+namespace {
+
+nn::GeneralResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>>
+convertExecutionResultsHelper(const hidl_vec<V1_2::OutputShape>& outputShapes,
+                              const V1_2::Timing& timing) {
+    return std::make_pair(NN_TRY(validatedConvertToCanonical(outputShapes)),
+                          NN_TRY(validatedConvertToCanonical(timing)));
+}
+
+nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>> convertExecutionResults(
+        const hidl_vec<V1_2::OutputShape>& outputShapes, const V1_2::Timing& timing) {
+    return hal::utils::makeExecutionFailure(convertExecutionResultsHelper(outputShapes, timing));
+}
+
+nn::GeneralResult<hidl_vec<hidl_handle>> convertSyncFences(
+        const std::vector<nn::SyncFence>& syncFences) {
+    hidl_vec<hidl_handle> handles(syncFences.size());
+    for (size_t i = 0; i < syncFences.size(); ++i) {
+        handles[i] = NN_TRY(V1_2::utils::convert(syncFences[i].getHandle()));
+    }
+    return handles;
+}
+
+nn::GeneralResult<std::pair<nn::Timing, nn::Timing>> convertFencedExecutionCallbackResults(
+        const V1_2::Timing& timingLaunched, const V1_2::Timing& timingFenced) {
+    return std::make_pair(NN_TRY(validatedConvertToCanonical(timingLaunched)),
+                          NN_TRY(validatedConvertToCanonical(timingFenced)));
+}
+
+nn::GeneralResult<std::pair<nn::SyncFence, nn::ExecuteFencedInfoCallback>>
+convertExecuteFencedResults(const hidl_handle& syncFence,
+                            const sp<IFencedExecutionCallback>& callback) {
+    auto resultSyncFence = nn::SyncFence::createAsSignaled();
+    if (syncFence.getNativeHandle() != nullptr) {
+        auto nativeHandle = NN_TRY(validatedConvertToCanonical(syncFence));
+        resultSyncFence = NN_TRY(hal::utils::makeGeneralFailure(
+                nn::SyncFence::create(std::move(nativeHandle)), nn::ErrorStatus::GENERAL_FAILURE));
+    }
+
+    if (callback == nullptr) {
+        return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE) << "callback is null";
+    }
+
+    // Create callback which can be used to retrieve the execution error status and timings.
+    nn::ExecuteFencedInfoCallback resultCallback =
+            [callback]() -> nn::GeneralResult<std::pair<nn::Timing, nn::Timing>> {
+        nn::GeneralResult<std::pair<nn::Timing, nn::Timing>> result =
+                NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE) << "uninitialized";
+        auto cb = [&result](ErrorStatus status, const V1_2::Timing& timingLaunched,
+                            const V1_2::Timing& timingFenced) {
+            if (status != ErrorStatus::NONE) {
+                const auto canonical = validatedConvertToCanonical(status).value_or(
+                        nn::ErrorStatus::GENERAL_FAILURE);
+                result = NN_ERROR(canonical) << "getExecutionInfo failed with " << toString(status);
+            } else {
+                result = convertFencedExecutionCallbackResults(timingLaunched, timingFenced);
+            }
+        };
+
+        const auto ret = callback->getExecutionInfo(cb);
+        NN_TRY(hal::utils::handleTransportError(ret));
+
+        return result;
+    };
+
+    return std::make_pair(std::move(resultSyncFence), std::move(resultCallback));
+}
+
+}  // namespace
+
+nn::GeneralResult<std::shared_ptr<const PreparedModel>> PreparedModel::create(
+        sp<V1_3::IPreparedModel> preparedModel) {
+    if (preparedModel == nullptr) {
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "V1_3::utils::PreparedModel::create must have non-null preparedModel";
+    }
+
+    auto deathHandler = NN_TRY(hal::utils::DeathHandler::create(preparedModel));
+    return std::make_shared<const PreparedModel>(PrivateConstructorTag{}, std::move(preparedModel),
+                                                 std::move(deathHandler));
+}
+
+PreparedModel::PreparedModel(PrivateConstructorTag /*tag*/, sp<V1_3::IPreparedModel> preparedModel,
+                             hal::utils::DeathHandler deathHandler)
+    : kPreparedModel(std::move(preparedModel)), kDeathHandler(std::move(deathHandler)) {}
+
+nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>>
+PreparedModel::executeSynchronously(const Request& request, V1_2::MeasureTiming measure,
+                                    const OptionalTimePoint& deadline,
+                                    const OptionalTimeoutDuration& loopTimeoutDuration) const {
+    nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>> result =
+            NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE) << "uninitialized";
+    const auto cb = [&result](ErrorStatus status, const hidl_vec<V1_2::OutputShape>& outputShapes,
+                              const V1_2::Timing& timing) {
+        if (status != ErrorStatus::NONE) {
+            const auto canonical =
+                    validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+            result = NN_ERROR(canonical) << "executeSynchronously failed with " << toString(status);
+        } else {
+            result = convertExecutionResults(outputShapes, timing);
+        }
+    };
+
+    const auto ret = kPreparedModel->executeSynchronously_1_3(request, measure, deadline,
+                                                              loopTimeoutDuration, cb);
+    NN_TRY(hal::utils::makeExecutionFailure(hal::utils::handleTransportError(ret)));
+
+    return result;
+}
+
+nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>>
+PreparedModel::executeAsynchronously(const Request& request, V1_2::MeasureTiming measure,
+                                     const OptionalTimePoint& deadline,
+                                     const OptionalTimeoutDuration& loopTimeoutDuration) const {
+    const auto cb = sp<ExecutionCallback>::make();
+    const auto scoped = kDeathHandler.protectCallback(cb.get());
+
+    const auto ret =
+            kPreparedModel->execute_1_3(request, measure, deadline, loopTimeoutDuration, cb);
+    const auto status =
+            NN_TRY(hal::utils::makeExecutionFailure(hal::utils::handleTransportError(ret)));
+    if (status != ErrorStatus::NONE) {
+        const auto canonical =
+                validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+        return NN_ERROR(canonical) << "executeAsynchronously failed with " << toString(status);
+    }
+
+    return cb->get();
+}
+
+nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>> PreparedModel::execute(
+        const nn::Request& request, nn::MeasureTiming measure,
+        const nn::OptionalTimePoint& deadline,
+        const nn::OptionalTimeoutDuration& loopTimeoutDuration) const {
+    // Ensure that request is ready for IPC.
+    std::optional<nn::Request> maybeRequestInShared;
+    const nn::Request& requestInShared = NN_TRY(hal::utils::makeExecutionFailure(
+            hal::utils::flushDataFromPointerToShared(&request, &maybeRequestInShared)));
+
+    const auto hidlRequest = NN_TRY(hal::utils::makeExecutionFailure(convert(requestInShared)));
+    const auto hidlMeasure =
+            NN_TRY(hal::utils::makeExecutionFailure(V1_2::utils::convert(measure)));
+    const auto hidlDeadline = NN_TRY(hal::utils::makeExecutionFailure(convert(deadline)));
+    const auto hidlLoopTimeoutDuration =
+            NN_TRY(hal::utils::makeExecutionFailure(convert(loopTimeoutDuration)));
+
+    nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>> result =
+            NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE) << "uninitialized";
+    const bool preferSynchronous = true;
+
+    // Execute synchronously if allowed.
+    if (preferSynchronous) {
+        result = executeSynchronously(hidlRequest, hidlMeasure, hidlDeadline,
+                                      hidlLoopTimeoutDuration);
+    }
+
+    // Run asymchronous execution if execution has not already completed.
+    if (!result.has_value()) {
+        result = executeAsynchronously(hidlRequest, hidlMeasure, hidlDeadline,
+                                       hidlLoopTimeoutDuration);
+    }
+
+    // Flush output buffers if suxcessful execution.
+    if (result.has_value()) {
+        NN_TRY(hal::utils::makeExecutionFailure(
+                hal::utils::unflushDataFromSharedToPointer(request, maybeRequestInShared)));
+    }
+
+    return result;
+}
+
+nn::GeneralResult<std::pair<nn::SyncFence, nn::ExecuteFencedInfoCallback>>
+PreparedModel::executeFenced(const nn::Request& request, const std::vector<nn::SyncFence>& waitFor,
+                             nn::MeasureTiming measure, const nn::OptionalTimePoint& deadline,
+                             const nn::OptionalTimeoutDuration& loopTimeoutDuration,
+                             const nn::OptionalTimeoutDuration& timeoutDurationAfterFence) const {
+    // Ensure that request is ready for IPC.
+    std::optional<nn::Request> maybeRequestInShared;
+    const nn::Request& requestInShared =
+            NN_TRY(hal::utils::flushDataFromPointerToShared(&request, &maybeRequestInShared));
+
+    const auto hidlRequest = NN_TRY(convert(requestInShared));
+    const auto hidlWaitFor = NN_TRY(convertSyncFences(waitFor));
+    const auto hidlMeasure = NN_TRY(V1_2::utils::convert(measure));
+    const auto hidlDeadline = NN_TRY(convert(deadline));
+    const auto hidlLoopTimeoutDuration = NN_TRY(convert(loopTimeoutDuration));
+    const auto hidlTimeoutDurationAfterFence = NN_TRY(convert(timeoutDurationAfterFence));
+
+    nn::GeneralResult<std::pair<nn::SyncFence, nn::ExecuteFencedInfoCallback>> result =
+            NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE) << "uninitialized";
+    auto cb = [&result](ErrorStatus status, const hidl_handle& syncFence,
+                        const sp<IFencedExecutionCallback>& callback) {
+        if (status != ErrorStatus::NONE) {
+            const auto canonical =
+                    validatedConvertToCanonical(status).value_or(nn::ErrorStatus::GENERAL_FAILURE);
+            result = NN_ERROR(canonical) << "executeFenced failed with " << toString(status);
+        } else {
+            result = convertExecuteFencedResults(syncFence, callback);
+        }
+    };
+
+    const auto ret = kPreparedModel->executeFenced(hidlRequest, hidlWaitFor, hidlMeasure,
+                                                   hidlDeadline, hidlLoopTimeoutDuration,
+                                                   hidlTimeoutDurationAfterFence, cb);
+    NN_TRY(hal::utils::handleTransportError(ret));
+    auto [syncFence, callback] = NN_TRY(std::move(result));
+
+    // If executeFenced required the request memory to be moved into shared memory, block here until
+    // the fenced execution has completed and flush the memory back.
+    if (maybeRequestInShared.has_value()) {
+        const auto state = syncFence.syncWait({});
+        if (state != nn::SyncFence::FenceState::SIGNALED) {
+            return NN_ERROR() << "syncWait failed with " << state;
+        }
+        NN_TRY(hal::utils::unflushDataFromSharedToPointer(request, maybeRequestInShared));
+    }
+
+    return std::make_pair(std::move(syncFence), std::move(callback));
+}
+
+std::any PreparedModel::getUnderlyingResource() const {
+    sp<V1_3::IPreparedModel> resource = kPreparedModel;
+    return resource;
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_3::utils
diff --git a/neuralnetworks/1.3/utils/src/Service.cpp b/neuralnetworks/1.3/utils/src/Service.cpp
new file mode 100644
index 0000000..62887fb
--- /dev/null
+++ b/neuralnetworks/1.3/utils/src/Service.cpp
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "Service.h"
+
+#include <nnapi/IDevice.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/ResilientDevice.h>
+#include <string>
+#include "Device.h"
+
+namespace android::hardware::neuralnetworks::V1_3::utils {
+
+nn::GeneralResult<nn::SharedDevice> getDevice(const std::string& name) {
+    hal::utils::ResilientDevice::Factory makeDevice =
+            [name](bool blocking) -> nn::GeneralResult<nn::SharedDevice> {
+        auto service = blocking ? IDevice::getService(name) : IDevice::tryGetService(name);
+        if (service == nullptr) {
+            return NN_ERROR() << (blocking ? "getService" : "tryGetService") << " returned nullptr";
+        }
+        return Device::create(name, std::move(service));
+    };
+
+    return hal::utils::ResilientDevice::create(std::move(makeDevice));
+}
+
+}  // namespace android::hardware::neuralnetworks::V1_3::utils
diff --git a/neuralnetworks/utils/common/Android.bp b/neuralnetworks/utils/common/Android.bp
index b61dc97..21562cf 100644
--- a/neuralnetworks/utils/common/Android.bp
+++ b/neuralnetworks/utils/common/Android.bp
@@ -20,6 +20,7 @@
     srcs: ["src/*"],
     local_include_dirs: ["include/nnapi/hal"],
     export_include_dirs: ["include"],
+    cflags: ["-Wthread-safety"],
     static_libs: [
         "neuralnetworks_types",
     ],
diff --git a/neuralnetworks/utils/common/include/nnapi/hal/CommonUtils.h b/neuralnetworks/utils/common/include/nnapi/hal/CommonUtils.h
index 8c01368..254a3d4 100644
--- a/neuralnetworks/utils/common/include/nnapi/hal/CommonUtils.h
+++ b/neuralnetworks/utils/common/include/nnapi/hal/CommonUtils.h
@@ -19,6 +19,7 @@
 
 #include <nnapi/Result.h>
 #include <nnapi/Types.h>
+#include <functional>
 #include <vector>
 
 // Shorthand
@@ -42,14 +43,16 @@
 bool hasNoPointerData(const nn::Request& request);
 
 // Relocate pointer-based data to shared memory.
-nn::Result<nn::Model> flushDataFromPointerToShared(const nn::Model& model);
-nn::Result<nn::Request> flushDataFromPointerToShared(const nn::Request& request);
+nn::GeneralResult<std::reference_wrapper<const nn::Model>> flushDataFromPointerToShared(
+        const nn::Model* model, std::optional<nn::Model>* maybeModelInSharedOut);
+nn::GeneralResult<std::reference_wrapper<const nn::Request>> flushDataFromPointerToShared(
+        const nn::Request* request, std::optional<nn::Request>* maybeRequestInSharedOut);
 
 // Undoes `flushDataFromPointerToShared` on a Request object. More specifically,
 // `unflushDataFromSharedToPointer` copies the output shared memory data from the transformed
 // Request object back to the output pointer-based memory in the original Request object.
-nn::Result<void> unflushDataFromSharedToPointer(const nn::Request& request,
-                                                const nn::Request& requestInShared);
+nn::GeneralResult<void> unflushDataFromSharedToPointer(
+        const nn::Request& request, const std::optional<nn::Request>& maybeRequestInShared);
 
 std::vector<uint32_t> countNumberOfConsumers(size_t numberOfOperands,
                                              const std::vector<nn::Operation>& operations);
diff --git a/neuralnetworks/utils/common/include/nnapi/hal/HandleError.h b/neuralnetworks/utils/common/include/nnapi/hal/HandleError.h
new file mode 100644
index 0000000..e4046b5
--- /dev/null
+++ b/neuralnetworks/utils/common/include/nnapi/hal/HandleError.h
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <android/hidl/base/1.0/IBase.h>
+#include <hidl/HidlSupport.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+
+namespace android::hardware::neuralnetworks::utils {
+
+template <typename Type>
+nn::GeneralResult<Type> handleTransportError(const hardware::Return<Type>& ret) {
+    if (ret.isDeadObject()) {
+        return NN_ERROR(nn::ErrorStatus::DEAD_OBJECT)
+               << "Return<>::isDeadObject returned true: " << ret.description();
+    }
+    if (!ret.isOk()) {
+        return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+               << "Return<>::isOk returned false: " << ret.description();
+    }
+    return ret;
+}
+
+template <>
+inline nn::GeneralResult<void> handleTransportError(const hardware::Return<void>& ret) {
+    if (ret.isDeadObject()) {
+        return NN_ERROR(nn::ErrorStatus::DEAD_OBJECT)
+               << "Return<>::isDeadObject returned true: " << ret.description();
+    }
+    if (!ret.isOk()) {
+        return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE)
+               << "Return<>::isOk returned false: " << ret.description();
+    }
+    return {};
+}
+
+template <typename Type>
+nn::GeneralResult<Type> makeGeneralFailure(nn::Result<Type> result, nn::ErrorStatus status) {
+    if (!result.has_value()) {
+        return nn::error(status) << std::move(result).error();
+    }
+    return std::move(result).value();
+}
+
+template <>
+inline nn::GeneralResult<void> makeGeneralFailure(nn::Result<void> result, nn::ErrorStatus status) {
+    if (!result.has_value()) {
+        return nn::error(status) << std::move(result).error();
+    }
+    return {};
+}
+
+template <typename Type>
+nn::ExecutionResult<Type> makeExecutionFailure(nn::Result<Type> result, nn::ErrorStatus status) {
+    if (!result.has_value()) {
+        return nn::error(status) << std::move(result).error();
+    }
+    return std::move(result).value();
+}
+
+template <>
+inline nn::ExecutionResult<void> makeExecutionFailure(nn::Result<void> result,
+                                                      nn::ErrorStatus status) {
+    if (!result.has_value()) {
+        return nn::error(status) << std::move(result).error();
+    }
+    return {};
+}
+
+template <typename Type>
+nn::ExecutionResult<Type> makeExecutionFailure(nn::GeneralResult<Type> result) {
+    if (!result.has_value()) {
+        const auto [message, status] = std::move(result).error();
+        return nn::error(status) << message;
+    }
+    return std::move(result).value();
+}
+
+template <>
+inline nn::ExecutionResult<void> makeExecutionFailure(nn::GeneralResult<void> result) {
+    if (!result.has_value()) {
+        const auto [message, status] = std::move(result).error();
+        return nn::error(status) << message;
+    }
+    return {};
+}
+
+}  // namespace android::hardware::neuralnetworks::utils
\ No newline at end of file
diff --git a/neuralnetworks/utils/common/include/nnapi/hal/ProtectCallback.h b/neuralnetworks/utils/common/include/nnapi/hal/ProtectCallback.h
new file mode 100644
index 0000000..85bd613
--- /dev/null
+++ b/neuralnetworks/utils/common/include/nnapi/hal/ProtectCallback.h
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_PROTECT_CALLBACK_H
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_PROTECT_CALLBACK_H
+
+#include <android-base/scopeguard.h>
+#include <android-base/thread_annotations.h>
+#include <android/hidl/base/1.0/IBase.h>
+#include <hidl/HidlSupport.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+
+#include <functional>
+#include <mutex>
+#include <vector>
+
+namespace android::hardware::neuralnetworks::utils {
+
+class IProtectedCallback {
+  public:
+    /**
+     * Marks this object as a dead object.
+     */
+    virtual void notifyAsDeadObject() = 0;
+
+    // Public virtual destructor to allow objects to be stored (and destroyed) as smart pointers.
+    // E.g., std::unique_ptr<IProtectedCallback>.
+    virtual ~IProtectedCallback() = default;
+
+  protected:
+    // Protect the non-destructor special member functions to prevent object slicing.
+    IProtectedCallback() = default;
+    IProtectedCallback(const IProtectedCallback&) = default;
+    IProtectedCallback(IProtectedCallback&&) noexcept = default;
+    IProtectedCallback& operator=(const IProtectedCallback&) = default;
+    IProtectedCallback& operator=(IProtectedCallback&&) noexcept = default;
+};
+
+// Thread safe class
+class DeathRecipient final : public hidl_death_recipient {
+  public:
+    void serviceDied(uint64_t /*cookie*/, const wp<hidl::base::V1_0::IBase>& /*who*/) override;
+    // Precondition: `killable` must be non-null.
+    void add(IProtectedCallback* killable) const;
+    // Precondition: `killable` must be non-null.
+    void remove(IProtectedCallback* killable) const;
+
+  private:
+    mutable std::mutex mMutex;
+    mutable std::vector<IProtectedCallback*> mObjects GUARDED_BY(mMutex);
+};
+
+class DeathHandler final {
+  public:
+    static nn::GeneralResult<DeathHandler> create(sp<hidl::base::V1_0::IBase> object);
+
+    DeathHandler(const DeathHandler&) = delete;
+    DeathHandler(DeathHandler&&) noexcept = default;
+    DeathHandler& operator=(const DeathHandler&) = delete;
+    DeathHandler& operator=(DeathHandler&&) noexcept = delete;
+    ~DeathHandler();
+
+    using Cleanup = std::function<void()>;
+    // Precondition: `killable` must be non-null.
+    [[nodiscard]] base::ScopeGuard<Cleanup> protectCallback(IProtectedCallback* killable) const;
+
+  private:
+    DeathHandler(sp<hidl::base::V1_0::IBase> object, sp<DeathRecipient> deathRecipient);
+
+    sp<hidl::base::V1_0::IBase> kObject;
+    sp<DeathRecipient> kDeathRecipient;
+};
+
+}  // namespace android::hardware::neuralnetworks::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_PROTECT_CALLBACK_H
diff --git a/neuralnetworks/utils/common/include/nnapi/hal/ResilientBuffer.h b/neuralnetworks/utils/common/include/nnapi/hal/ResilientBuffer.h
new file mode 100644
index 0000000..996ec1e
--- /dev/null
+++ b/neuralnetworks/utils/common/include/nnapi/hal/ResilientBuffer.h
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_RESILIENT_BUFFER_H
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_RESILIENT_BUFFER_H
+
+#include <android-base/thread_annotations.h>
+#include <nnapi/IBuffer.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+
+#include <functional>
+#include <memory>
+#include <mutex>
+#include <utility>
+#include <vector>
+
+namespace android::hardware::neuralnetworks::utils {
+
+class ResilientBuffer final : public nn::IBuffer {
+    struct PrivateConstructorTag {};
+
+  public:
+    using Factory = std::function<nn::GeneralResult<nn::SharedBuffer>(bool blocking)>;
+
+    static nn::GeneralResult<std::shared_ptr<const ResilientBuffer>> create(Factory makeBuffer);
+
+    explicit ResilientBuffer(PrivateConstructorTag tag, Factory makeBuffer,
+                             nn::SharedBuffer buffer);
+
+    nn::SharedBuffer getBuffer() const;
+    nn::SharedBuffer recover(const nn::IBuffer* failingBuffer, bool blocking) const;
+
+    nn::Request::MemoryDomainToken getToken() const override;
+
+    nn::GeneralResult<void> copyTo(const nn::Memory& dst) const override;
+
+    nn::GeneralResult<void> copyFrom(const nn::Memory& src,
+                                     const nn::Dimensions& dimensions) const override;
+
+  private:
+    const Factory kMakeBuffer;
+    mutable std::mutex mMutex;
+    mutable nn::SharedBuffer mBuffer GUARDED_BY(mMutex);
+};
+
+}  // namespace android::hardware::neuralnetworks::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_RESILIENT_BUFFER_H
diff --git a/neuralnetworks/utils/common/include/nnapi/hal/ResilientDevice.h b/neuralnetworks/utils/common/include/nnapi/hal/ResilientDevice.h
new file mode 100644
index 0000000..4f1afb9
--- /dev/null
+++ b/neuralnetworks/utils/common/include/nnapi/hal/ResilientDevice.h
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_RESILIENT_DEVICE_H
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_RESILIENT_DEVICE_H
+
+#include <android-base/thread_annotations.h>
+#include <nnapi/IBuffer.h>
+#include <nnapi/IDevice.h>
+#include <nnapi/IPreparedModel.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+
+#include <functional>
+#include <memory>
+#include <mutex>
+#include <string>
+#include <vector>
+
+namespace android::hardware::neuralnetworks::utils {
+
+class ResilientDevice final : public nn::IDevice,
+                              public std::enable_shared_from_this<ResilientDevice> {
+    struct PrivateConstructorTag {};
+
+  public:
+    using Factory = std::function<nn::GeneralResult<nn::SharedDevice>(bool blocking)>;
+
+    static nn::GeneralResult<std::shared_ptr<const ResilientDevice>> create(Factory makeDevice);
+
+    explicit ResilientDevice(PrivateConstructorTag tag, Factory makeDevice, std::string name,
+                             std::string versionString, std::vector<nn::Extension> extensions,
+                             nn::Capabilities capabilities, nn::SharedDevice device);
+
+    nn::SharedDevice getDevice() const;
+    nn::SharedDevice recover(const nn::IDevice* failingDevice, bool blocking) const;
+
+    const std::string& getName() const override;
+    const std::string& getVersionString() const override;
+    nn::Version getFeatureLevel() const override;
+    nn::DeviceType getType() const override;
+    const std::vector<nn::Extension>& getSupportedExtensions() const override;
+    const nn::Capabilities& getCapabilities() const override;
+    std::pair<uint32_t, uint32_t> getNumberOfCacheFilesNeeded() const override;
+
+    nn::GeneralResult<void> wait() const override;
+
+    nn::GeneralResult<std::vector<bool>> getSupportedOperations(
+            const nn::Model& model) const override;
+
+    nn::GeneralResult<nn::SharedPreparedModel> prepareModel(
+            const nn::Model& model, nn::ExecutionPreference preference, nn::Priority priority,
+            nn::OptionalTimePoint deadline, const std::vector<nn::NativeHandle>& modelCache,
+            const std::vector<nn::NativeHandle>& dataCache,
+            const nn::CacheToken& token) const override;
+
+    nn::GeneralResult<nn::SharedPreparedModel> prepareModelFromCache(
+            nn::OptionalTimePoint deadline, const std::vector<nn::NativeHandle>& modelCache,
+            const std::vector<nn::NativeHandle>& dataCache,
+            const nn::CacheToken& token) const override;
+
+    nn::GeneralResult<nn::SharedBuffer> allocate(
+            const nn::BufferDesc& desc, const std::vector<nn::SharedPreparedModel>& preparedModels,
+            const std::vector<nn::BufferRole>& inputRoles,
+            const std::vector<nn::BufferRole>& outputRoles) const override;
+
+  private:
+    nn::GeneralResult<nn::SharedPreparedModel> prepareModelInternal(
+            bool blocking, const nn::Model& model, nn::ExecutionPreference preference,
+            nn::Priority priority, nn::OptionalTimePoint deadline,
+            const std::vector<nn::NativeHandle>& modelCache,
+            const std::vector<nn::NativeHandle>& dataCache, const nn::CacheToken& token) const;
+    nn::GeneralResult<nn::SharedPreparedModel> prepareModelFromCacheInternal(
+            bool blocking, nn::OptionalTimePoint deadline,
+            const std::vector<nn::NativeHandle>& modelCache,
+            const std::vector<nn::NativeHandle>& dataCache, const nn::CacheToken& token) const;
+    nn::GeneralResult<nn::SharedBuffer> allocateInternal(
+            bool blocking, const nn::BufferDesc& desc,
+            const std::vector<nn::SharedPreparedModel>& preparedModels,
+            const std::vector<nn::BufferRole>& inputRoles,
+            const std::vector<nn::BufferRole>& outputRoles) const;
+
+    const Factory kMakeDevice;
+    const std::string kName;
+    const std::string kVersionString;
+    const std::vector<nn::Extension> kExtensions;
+    const nn::Capabilities kCapabilities;
+    mutable std::mutex mMutex;
+    mutable nn::SharedDevice mDevice GUARDED_BY(mMutex);
+};
+
+}  // namespace android::hardware::neuralnetworks::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_RESILIENT_DEVICE_H
diff --git a/neuralnetworks/utils/common/include/nnapi/hal/ResilientPreparedModel.h b/neuralnetworks/utils/common/include/nnapi/hal/ResilientPreparedModel.h
new file mode 100644
index 0000000..c2940d1
--- /dev/null
+++ b/neuralnetworks/utils/common/include/nnapi/hal/ResilientPreparedModel.h
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_RESILIENT_PREPARED_MODEL_H
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_RESILIENT_PREPARED_MODEL_H
+
+#include <android-base/thread_annotations.h>
+#include <nnapi/IPreparedModel.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+
+#include <functional>
+#include <memory>
+#include <mutex>
+#include <utility>
+#include <vector>
+
+namespace android::hardware::neuralnetworks::utils {
+
+class ResilientPreparedModel final : public nn::IPreparedModel {
+    struct PrivateConstructorTag {};
+
+  public:
+    using Factory = std::function<nn::GeneralResult<nn::SharedPreparedModel>(bool blocking)>;
+
+    static nn::GeneralResult<std::shared_ptr<const ResilientPreparedModel>> create(
+            Factory makePreparedModel);
+
+    explicit ResilientPreparedModel(PrivateConstructorTag tag, Factory makePreparedModel,
+                                    nn::SharedPreparedModel preparedModel);
+
+    nn::SharedPreparedModel getPreparedModel() const;
+    nn::SharedPreparedModel recover(const nn::IPreparedModel* failingPreparedModel,
+                                    bool blocking) const;
+
+    nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>> execute(
+            const nn::Request& request, nn::MeasureTiming measure,
+            const nn::OptionalTimePoint& deadline,
+            const nn::OptionalTimeoutDuration& loopTimeoutDuration) const override;
+
+    nn::GeneralResult<std::pair<nn::SyncFence, nn::ExecuteFencedInfoCallback>> executeFenced(
+            const nn::Request& request, const std::vector<nn::SyncFence>& waitFor,
+            nn::MeasureTiming measure, const nn::OptionalTimePoint& deadline,
+            const nn::OptionalTimeoutDuration& loopTimeoutDuration,
+            const nn::OptionalTimeoutDuration& timeoutDurationAfterFence) const override;
+
+    std::any getUnderlyingResource() const override;
+
+  private:
+    const Factory kMakePreparedModel;
+    mutable std::mutex mMutex;
+    mutable nn::SharedPreparedModel mPreparedModel GUARDED_BY(mMutex);
+};
+
+}  // namespace android::hardware::neuralnetworks::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_RESILIENT_PREPARED_MODEL_H
diff --git a/neuralnetworks/utils/common/include/nnapi/hal/TransferValue.h b/neuralnetworks/utils/common/include/nnapi/hal/TransferValue.h
new file mode 100644
index 0000000..7103c6b
--- /dev/null
+++ b/neuralnetworks/utils/common/include/nnapi/hal/TransferValue.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_TRANSFER_VALUE_H
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_TRANSFER_VALUE_H
+
+#include <android-base/thread_annotations.h>
+
+#include <condition_variable>
+#include <mutex>
+#include <optional>
+
+namespace android::hardware::neuralnetworks::utils {
+
+// This class is thread safe.
+template <typename Type>
+class TransferValue final {
+  public:
+    void put(Type object) const;
+    [[nodiscard]] Type take() const;
+
+  private:
+    mutable std::mutex mMutex;
+    mutable std::condition_variable mCondition;
+    mutable std::optional<Type> mObject GUARDED_BY(mMutex);
+};
+
+// template implementation
+
+template <typename Type>
+void TransferValue<Type>::put(Type object) const {
+    {
+        std::lock_guard guard(mMutex);
+        // Immediately return if value already exists.
+        if (mObject.has_value()) return;
+        mObject.emplace(std::move(object));
+    }
+    mCondition.notify_all();
+}
+
+template <typename Type>
+Type TransferValue<Type>::take() const {
+    std::unique_lock lock(mMutex);
+    base::ScopedLockAssertion lockAssertion(mMutex);
+    mCondition.wait(lock, [this]() REQUIRES(mMutex) { return mObject.has_value(); });
+    std::optional<Type> object;
+    std::swap(object, mObject);
+    return std::move(object).value();
+}
+
+}  // namespace android::hardware::neuralnetworks::utils
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_TRANSFER_VALUE_H
diff --git a/neuralnetworks/utils/common/src/CommonUtils.cpp b/neuralnetworks/utils/common/src/CommonUtils.cpp
index 667189b..2565972 100644
--- a/neuralnetworks/utils/common/src/CommonUtils.cpp
+++ b/neuralnetworks/utils/common/src/CommonUtils.cpp
@@ -16,6 +16,8 @@
 
 #include "CommonUtils.h"
 
+#include "HandleError.h"
+
 #include <android-base/logging.h>
 #include <nnapi/Result.h>
 #include <nnapi/SharedMemory.h>
@@ -25,6 +27,7 @@
 
 #include <algorithm>
 #include <any>
+#include <functional>
 #include <optional>
 #include <variant>
 #include <vector>
@@ -111,8 +114,18 @@
     return hasNoPointerData(request.inputs) && hasNoPointerData(request.outputs);
 }
 
-nn::Result<nn::Model> flushDataFromPointerToShared(const nn::Model& model) {
-    auto modelInShared = model;
+nn::GeneralResult<std::reference_wrapper<const nn::Model>> flushDataFromPointerToShared(
+        const nn::Model* model, std::optional<nn::Model>* maybeModelInSharedOut) {
+    CHECK(model != nullptr);
+    CHECK(maybeModelInSharedOut != nullptr);
+
+    if (hasNoPointerData(*model)) {
+        return *model;
+    }
+
+    // Make a copy of the model in order to make modifications. The modified model is returned to
+    // the caller through `maybeModelInSharedOut` if the function succeeds.
+    nn::Model modelInShared = *model;
 
     nn::ConstantMemoryBuilder memoryBuilder(modelInShared.pools.size());
     copyPointersToSharedMemory(&modelInShared.main, &memoryBuilder);
@@ -126,11 +139,22 @@
         modelInShared.pools.push_back(std::move(memory));
     }
 
-    return modelInShared;
+    *maybeModelInSharedOut = modelInShared;
+    return **maybeModelInSharedOut;
 }
 
-nn::Result<nn::Request> flushDataFromPointerToShared(const nn::Request& request) {
-    auto requestInShared = request;
+nn::GeneralResult<std::reference_wrapper<const nn::Request>> flushDataFromPointerToShared(
+        const nn::Request* request, std::optional<nn::Request>* maybeRequestInSharedOut) {
+    CHECK(request != nullptr);
+    CHECK(maybeRequestInSharedOut != nullptr);
+
+    if (hasNoPointerData(*request)) {
+        return *request;
+    }
+
+    // Make a copy of the request in order to make modifications. The modified request is returned
+    // to the caller through `maybeRequestInSharedOut` if the function succeeds.
+    nn::Request requestInShared = *request;
 
     // Change input pointers to shared memory.
     nn::ConstantMemoryBuilder inputBuilder(requestInShared.pools.size());
@@ -171,15 +195,17 @@
         requestInShared.pools.push_back(std::move(memory));
     }
 
-    return requestInShared;
+    *maybeRequestInSharedOut = requestInShared;
+    return **maybeRequestInSharedOut;
 }
 
-nn::Result<void> unflushDataFromSharedToPointer(const nn::Request& request,
-                                                const nn::Request& requestInShared) {
-    if (requestInShared.pools.empty() ||
-        !std::holds_alternative<nn::Memory>(requestInShared.pools.back())) {
+nn::GeneralResult<void> unflushDataFromSharedToPointer(
+        const nn::Request& request, const std::optional<nn::Request>& maybeRequestInShared) {
+    if (!maybeRequestInShared.has_value() || maybeRequestInShared->pools.empty() ||
+        !std::holds_alternative<nn::Memory>(maybeRequestInShared->pools.back())) {
         return {};
     }
+    const auto& requestInShared = *maybeRequestInShared;
 
     // Map the memory.
     const auto& outputMemory = std::get<nn::Memory>(requestInShared.pools.back());
diff --git a/neuralnetworks/utils/common/src/ProtectCallback.cpp b/neuralnetworks/utils/common/src/ProtectCallback.cpp
new file mode 100644
index 0000000..1d9a307
--- /dev/null
+++ b/neuralnetworks/utils/common/src/ProtectCallback.cpp
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "ProtectCallback.h"
+
+#include <android-base/logging.h>
+#include <android-base/scopeguard.h>
+#include <android-base/thread_annotations.h>
+#include <android/hidl/base/1.0/IBase.h>
+#include <hidl/HidlSupport.h>
+#include <nnapi/Result.h>
+#include <nnapi/hal/HandleError.h>
+
+#include <algorithm>
+#include <functional>
+#include <mutex>
+#include <vector>
+
+namespace android::hardware::neuralnetworks::utils {
+
+void DeathRecipient::serviceDied(uint64_t /*cookie*/, const wp<hidl::base::V1_0::IBase>& /*who*/) {
+    std::lock_guard guard(mMutex);
+    std::for_each(mObjects.begin(), mObjects.end(),
+                  [](IProtectedCallback* killable) { killable->notifyAsDeadObject(); });
+}
+
+void DeathRecipient::add(IProtectedCallback* killable) const {
+    CHECK(killable != nullptr);
+    std::lock_guard guard(mMutex);
+    mObjects.push_back(killable);
+}
+
+void DeathRecipient::remove(IProtectedCallback* killable) const {
+    CHECK(killable != nullptr);
+    std::lock_guard guard(mMutex);
+    const auto removedIter = std::remove(mObjects.begin(), mObjects.end(), killable);
+    mObjects.erase(removedIter);
+}
+
+nn::GeneralResult<DeathHandler> DeathHandler::create(sp<hidl::base::V1_0::IBase> object) {
+    if (object == nullptr) {
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "utils::DeathHandler::create must have non-null object";
+    }
+    auto deathRecipient = sp<DeathRecipient>::make();
+
+    const auto ret = object->linkToDeath(deathRecipient, /*cookie=*/0);
+    const bool success = NN_TRY(handleTransportError(ret));
+    if (!success) {
+        return NN_ERROR(nn::ErrorStatus::GENERAL_FAILURE) << "IBase::linkToDeath returned false";
+    }
+
+    return DeathHandler(std::move(object), std::move(deathRecipient));
+}
+
+DeathHandler::DeathHandler(sp<hidl::base::V1_0::IBase> object, sp<DeathRecipient> deathRecipient)
+    : kObject(std::move(object)), kDeathRecipient(std::move(deathRecipient)) {
+    CHECK(kObject != nullptr);
+    CHECK(kDeathRecipient != nullptr);
+}
+
+DeathHandler::~DeathHandler() {
+    if (kObject != nullptr && kDeathRecipient != nullptr) {
+        const auto ret = kObject->unlinkToDeath(kDeathRecipient);
+        const auto maybeSuccess = handleTransportError(ret);
+        if (!maybeSuccess.has_value()) {
+            LOG(ERROR) << maybeSuccess.error().message;
+        } else if (!maybeSuccess.value()) {
+            LOG(ERROR) << "IBase::linkToDeath returned false";
+        }
+    }
+}
+
+[[nodiscard]] base::ScopeGuard<DeathHandler::Cleanup> DeathHandler::protectCallback(
+        IProtectedCallback* killable) const {
+    CHECK(killable != nullptr);
+    kDeathRecipient->add(killable);
+    return base::make_scope_guard(
+            [deathRecipient = kDeathRecipient, killable] { deathRecipient->remove(killable); });
+}
+
+}  // namespace android::hardware::neuralnetworks::utils
diff --git a/neuralnetworks/utils/common/src/ResilientBuffer.cpp b/neuralnetworks/utils/common/src/ResilientBuffer.cpp
new file mode 100644
index 0000000..984295b
--- /dev/null
+++ b/neuralnetworks/utils/common/src/ResilientBuffer.cpp
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "ResilientBuffer.h"
+
+#include <android-base/logging.h>
+#include <android-base/thread_annotations.h>
+#include <nnapi/IBuffer.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+
+#include <functional>
+#include <memory>
+#include <mutex>
+#include <utility>
+#include <vector>
+
+namespace android::hardware::neuralnetworks::utils {
+
+nn::GeneralResult<std::shared_ptr<const ResilientBuffer>> ResilientBuffer::create(
+        Factory makeBuffer) {
+    if (makeBuffer == nullptr) {
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "utils::ResilientBuffer::create must have non-empty makeBuffer";
+    }
+    auto buffer = NN_TRY(makeBuffer(/*blocking=*/true));
+    CHECK(buffer != nullptr);
+    return std::make_shared<const ResilientBuffer>(PrivateConstructorTag{}, std::move(makeBuffer),
+                                                   std::move(buffer));
+}
+
+ResilientBuffer::ResilientBuffer(PrivateConstructorTag /*tag*/, Factory makeBuffer,
+                                 nn::SharedBuffer buffer)
+    : kMakeBuffer(std::move(makeBuffer)), mBuffer(std::move(buffer)) {
+    CHECK(kMakeBuffer != nullptr);
+    CHECK(mBuffer != nullptr);
+}
+
+nn::SharedBuffer ResilientBuffer::getBuffer() const {
+    std::lock_guard guard(mMutex);
+    return mBuffer;
+}
+nn::SharedBuffer ResilientBuffer::recover(const nn::IBuffer* /*failingBuffer*/,
+                                          bool /*blocking*/) const {
+    std::lock_guard guard(mMutex);
+    return mBuffer;
+}
+
+nn::Request::MemoryDomainToken ResilientBuffer::getToken() const {
+    return getBuffer()->getToken();
+}
+
+nn::GeneralResult<void> ResilientBuffer::copyTo(const nn::Memory& dst) const {
+    return getBuffer()->copyTo(dst);
+}
+
+nn::GeneralResult<void> ResilientBuffer::copyFrom(const nn::Memory& src,
+                                                  const nn::Dimensions& dimensions) const {
+    return getBuffer()->copyFrom(src, dimensions);
+}
+
+}  // namespace android::hardware::neuralnetworks::utils
diff --git a/neuralnetworks/utils/common/src/ResilientDevice.cpp b/neuralnetworks/utils/common/src/ResilientDevice.cpp
new file mode 100644
index 0000000..95662d9
--- /dev/null
+++ b/neuralnetworks/utils/common/src/ResilientDevice.cpp
@@ -0,0 +1,236 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "ResilientDevice.h"
+
+#include "ResilientBuffer.h"
+#include "ResilientPreparedModel.h"
+
+#include <android-base/logging.h>
+#include <nnapi/IBuffer.h>
+#include <nnapi/IDevice.h>
+#include <nnapi/IPreparedModel.h>
+#include <nnapi/Result.h>
+#include <nnapi/TypeUtils.h>
+#include <nnapi/Types.h>
+
+#include <algorithm>
+#include <memory>
+#include <string>
+#include <vector>
+
+namespace android::hardware::neuralnetworks::utils {
+namespace {
+
+template <typename FnType>
+auto protect(const ResilientDevice& resilientDevice, const FnType& fn, bool blocking)
+        -> decltype(fn(*resilientDevice.getDevice())) {
+    auto device = resilientDevice.getDevice();
+    auto result = fn(*device);
+
+    // Immediately return if device is not dead.
+    if (result.has_value() || result.error().code != nn::ErrorStatus::DEAD_OBJECT) {
+        return result;
+    }
+
+    device = resilientDevice.recover(device.get(), blocking);
+    return fn(*device);
+}
+
+}  // namespace
+
+nn::GeneralResult<std::shared_ptr<const ResilientDevice>> ResilientDevice::create(
+        Factory makeDevice) {
+    if (makeDevice == nullptr) {
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "utils::ResilientDevice::create must have non-empty makeDevice";
+    }
+    auto device = NN_TRY(makeDevice(/*blocking=*/true));
+    CHECK(device != nullptr);
+
+    auto name = device->getName();
+    auto versionString = device->getVersionString();
+    auto extensions = device->getSupportedExtensions();
+    auto capabilities = device->getCapabilities();
+
+    return std::make_shared<ResilientDevice>(PrivateConstructorTag{}, std::move(makeDevice),
+                                             std::move(name), std::move(versionString),
+                                             std::move(extensions), std::move(capabilities),
+                                             std::move(device));
+}
+
+ResilientDevice::ResilientDevice(PrivateConstructorTag /*tag*/, Factory makeDevice,
+                                 std::string name, std::string versionString,
+                                 std::vector<nn::Extension> extensions,
+                                 nn::Capabilities capabilities, nn::SharedDevice device)
+    : kMakeDevice(std::move(makeDevice)),
+      kName(std::move(name)),
+      kVersionString(std::move(versionString)),
+      kExtensions(std::move(extensions)),
+      kCapabilities(std::move(capabilities)),
+      mDevice(std::move(device)) {
+    CHECK(kMakeDevice != nullptr);
+    CHECK(mDevice != nullptr);
+}
+
+nn::SharedDevice ResilientDevice::getDevice() const {
+    std::lock_guard guard(mMutex);
+    return mDevice;
+}
+
+nn::SharedDevice ResilientDevice::recover(const nn::IDevice* failingDevice, bool blocking) const {
+    std::lock_guard guard(mMutex);
+
+    // Another caller updated the failing device.
+    if (mDevice.get() != failingDevice) {
+        return mDevice;
+    }
+
+    auto maybeDevice = kMakeDevice(blocking);
+    if (!maybeDevice.has_value()) {
+        const auto& [message, code] = maybeDevice.error();
+        LOG(ERROR) << "Failed to recover dead device with error " << code << ": " << message;
+        return mDevice;
+    }
+    auto device = std::move(maybeDevice).value();
+
+    // TODO(b/173081926): Instead of CHECKing to ensure the cache has not been changed, return an
+    // invalid/"null" IDevice object that always fails.
+    CHECK_EQ(kName, device->getName());
+    CHECK_EQ(kVersionString, device->getVersionString());
+    CHECK(kExtensions == device->getSupportedExtensions());
+    CHECK_EQ(kCapabilities, device->getCapabilities());
+
+    mDevice = std::move(device);
+    return mDevice;
+}
+
+const std::string& ResilientDevice::getName() const {
+    return kName;
+}
+
+const std::string& ResilientDevice::getVersionString() const {
+    return kVersionString;
+}
+
+nn::Version ResilientDevice::getFeatureLevel() const {
+    return getDevice()->getFeatureLevel();
+}
+
+nn::DeviceType ResilientDevice::getType() const {
+    return getDevice()->getType();
+}
+
+const std::vector<nn::Extension>& ResilientDevice::getSupportedExtensions() const {
+    return kExtensions;
+}
+
+const nn::Capabilities& ResilientDevice::getCapabilities() const {
+    return kCapabilities;
+}
+
+std::pair<uint32_t, uint32_t> ResilientDevice::getNumberOfCacheFilesNeeded() const {
+    return getDevice()->getNumberOfCacheFilesNeeded();
+}
+
+nn::GeneralResult<void> ResilientDevice::wait() const {
+    const auto fn = [](const nn::IDevice& device) { return device.wait(); };
+    return protect(*this, fn, /*blocking=*/true);
+}
+
+nn::GeneralResult<std::vector<bool>> ResilientDevice::getSupportedOperations(
+        const nn::Model& model) const {
+    const auto fn = [&model](const nn::IDevice& device) {
+        return device.getSupportedOperations(model);
+    };
+    return protect(*this, fn, /*blocking=*/false);
+}
+
+nn::GeneralResult<nn::SharedPreparedModel> ResilientDevice::prepareModel(
+        const nn::Model& model, nn::ExecutionPreference preference, nn::Priority priority,
+        nn::OptionalTimePoint deadline, const std::vector<nn::NativeHandle>& modelCache,
+        const std::vector<nn::NativeHandle>& dataCache, const nn::CacheToken& token) const {
+    auto self = shared_from_this();
+    ResilientPreparedModel::Factory makePreparedModel =
+            [device = std::move(self), model, preference, priority, deadline, modelCache, dataCache,
+             token](bool blocking) -> nn::GeneralResult<nn::SharedPreparedModel> {
+        return device->prepareModelInternal(blocking, model, preference, priority, deadline,
+                                            modelCache, dataCache, token);
+    };
+    return ResilientPreparedModel::create(std::move(makePreparedModel));
+}
+
+nn::GeneralResult<nn::SharedPreparedModel> ResilientDevice::prepareModelFromCache(
+        nn::OptionalTimePoint deadline, const std::vector<nn::NativeHandle>& modelCache,
+        const std::vector<nn::NativeHandle>& dataCache, const nn::CacheToken& token) const {
+    auto self = shared_from_this();
+    ResilientPreparedModel::Factory makePreparedModel =
+            [device = std::move(self), deadline, modelCache, dataCache,
+             token](bool blocking) -> nn::GeneralResult<nn::SharedPreparedModel> {
+        return device->prepareModelFromCacheInternal(blocking, deadline, modelCache, dataCache,
+                                                     token);
+    };
+    return ResilientPreparedModel::create(std::move(makePreparedModel));
+}
+
+nn::GeneralResult<nn::SharedBuffer> ResilientDevice::allocate(
+        const nn::BufferDesc& desc, const std::vector<nn::SharedPreparedModel>& preparedModels,
+        const std::vector<nn::BufferRole>& inputRoles,
+        const std::vector<nn::BufferRole>& outputRoles) const {
+    auto self = shared_from_this();
+    ResilientBuffer::Factory makeBuffer =
+            [device = std::move(self), desc, preparedModels, inputRoles,
+             outputRoles](bool blocking) -> nn::GeneralResult<nn::SharedBuffer> {
+        return device->allocateInternal(blocking, desc, preparedModels, inputRoles, outputRoles);
+    };
+    return ResilientBuffer::create(std::move(makeBuffer));
+}
+
+nn::GeneralResult<nn::SharedPreparedModel> ResilientDevice::prepareModelInternal(
+        bool blocking, const nn::Model& model, nn::ExecutionPreference preference,
+        nn::Priority priority, nn::OptionalTimePoint deadline,
+        const std::vector<nn::NativeHandle>& modelCache,
+        const std::vector<nn::NativeHandle>& dataCache, const nn::CacheToken& token) const {
+    const auto fn = [&model, preference, priority, deadline, &modelCache, &dataCache,
+                     token](const nn::IDevice& device) {
+        return device.prepareModel(model, preference, priority, deadline, modelCache, dataCache,
+                                   token);
+    };
+    return protect(*this, fn, blocking);
+}
+
+nn::GeneralResult<nn::SharedPreparedModel> ResilientDevice::prepareModelFromCacheInternal(
+        bool blocking, nn::OptionalTimePoint deadline,
+        const std::vector<nn::NativeHandle>& modelCache,
+        const std::vector<nn::NativeHandle>& dataCache, const nn::CacheToken& token) const {
+    const auto fn = [deadline, &modelCache, &dataCache, token](const nn::IDevice& device) {
+        return device.prepareModelFromCache(deadline, modelCache, dataCache, token);
+    };
+    return protect(*this, fn, blocking);
+}
+
+nn::GeneralResult<nn::SharedBuffer> ResilientDevice::allocateInternal(
+        bool blocking, const nn::BufferDesc& desc,
+        const std::vector<nn::SharedPreparedModel>& preparedModels,
+        const std::vector<nn::BufferRole>& inputRoles,
+        const std::vector<nn::BufferRole>& outputRoles) const {
+    const auto fn = [&desc, &preparedModels, &inputRoles, &outputRoles](const nn::IDevice& device) {
+        return device.allocate(desc, preparedModels, inputRoles, outputRoles);
+    };
+    return protect(*this, fn, blocking);
+}
+
+}  // namespace android::hardware::neuralnetworks::utils
diff --git a/neuralnetworks/utils/common/src/ResilientPreparedModel.cpp b/neuralnetworks/utils/common/src/ResilientPreparedModel.cpp
new file mode 100644
index 0000000..1c9ecba
--- /dev/null
+++ b/neuralnetworks/utils/common/src/ResilientPreparedModel.cpp
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "ResilientPreparedModel.h"
+
+#include <android-base/logging.h>
+#include <android-base/thread_annotations.h>
+#include <nnapi/IPreparedModel.h>
+#include <nnapi/Result.h>
+#include <nnapi/Types.h>
+
+#include <functional>
+#include <memory>
+#include <mutex>
+#include <utility>
+#include <vector>
+
+namespace android::hardware::neuralnetworks::utils {
+
+nn::GeneralResult<std::shared_ptr<const ResilientPreparedModel>> ResilientPreparedModel::create(
+        Factory makePreparedModel) {
+    if (makePreparedModel == nullptr) {
+        return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
+               << "utils::ResilientPreparedModel::create must have non-empty makePreparedModel";
+    }
+    auto preparedModel = NN_TRY(makePreparedModel(/*blocking=*/true));
+    CHECK(preparedModel != nullptr);
+    return std::make_shared<ResilientPreparedModel>(
+            PrivateConstructorTag{}, std::move(makePreparedModel), std::move(preparedModel));
+}
+
+ResilientPreparedModel::ResilientPreparedModel(PrivateConstructorTag /*tag*/,
+                                               Factory makePreparedModel,
+                                               nn::SharedPreparedModel preparedModel)
+    : kMakePreparedModel(std::move(makePreparedModel)), mPreparedModel(std::move(preparedModel)) {
+    CHECK(kMakePreparedModel != nullptr);
+    CHECK(mPreparedModel != nullptr);
+}
+
+nn::SharedPreparedModel ResilientPreparedModel::getPreparedModel() const {
+    std::lock_guard guard(mMutex);
+    return mPreparedModel;
+}
+
+nn::SharedPreparedModel ResilientPreparedModel::recover(
+        const nn::IPreparedModel* /*failingPreparedModel*/, bool /*blocking*/) const {
+    std::lock_guard guard(mMutex);
+    return mPreparedModel;
+}
+
+nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>>
+ResilientPreparedModel::execute(const nn::Request& request, nn::MeasureTiming measure,
+                                const nn::OptionalTimePoint& deadline,
+                                const nn::OptionalTimeoutDuration& loopTimeoutDuration) const {
+    return getPreparedModel()->execute(request, measure, deadline, loopTimeoutDuration);
+}
+
+nn::GeneralResult<std::pair<nn::SyncFence, nn::ExecuteFencedInfoCallback>>
+ResilientPreparedModel::executeFenced(
+        const nn::Request& request, const std::vector<nn::SyncFence>& waitFor,
+        nn::MeasureTiming measure, const nn::OptionalTimePoint& deadline,
+        const nn::OptionalTimeoutDuration& loopTimeoutDuration,
+        const nn::OptionalTimeoutDuration& timeoutDurationAfterFence) const {
+    return getPreparedModel()->executeFenced(request, waitFor, measure, deadline,
+                                             loopTimeoutDuration, timeoutDurationAfterFence);
+}
+
+std::any ResilientPreparedModel::getUnderlyingResource() const {
+    return getPreparedModel()->getUnderlyingResource();
+}
+
+}  // namespace android::hardware::neuralnetworks::utils
diff --git a/neuralnetworks/utils/service/Android.bp b/neuralnetworks/utils/service/Android.bp
new file mode 100644
index 0000000..87d27c7
--- /dev/null
+++ b/neuralnetworks/utils/service/Android.bp
@@ -0,0 +1,36 @@
+//
+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+cc_library_static {
+    name: "neuralnetworks_utils_hal_service",
+    defaults: ["neuralnetworks_utils_defaults"],
+    srcs: ["src/*"],
+    local_include_dirs: ["include/nnapi/hal"],
+    export_include_dirs: ["include"],
+    static_libs: [
+        "neuralnetworks_types",
+        "neuralnetworks_utils_hal_1_0",
+        "neuralnetworks_utils_hal_1_1",
+        "neuralnetworks_utils_hal_1_2",
+        "neuralnetworks_utils_hal_1_3",
+    ],
+    shared_libs: [
+        "android.hardware.neuralnetworks@1.0",
+        "android.hardware.neuralnetworks@1.1",
+        "android.hardware.neuralnetworks@1.2",
+        "android.hardware.neuralnetworks@1.3",
+    ],
+}
diff --git a/neuralnetworks/utils/service/include/nnapi/hal/Service.h b/neuralnetworks/utils/service/include/nnapi/hal/Service.h
new file mode 100644
index 0000000..e339627
--- /dev/null
+++ b/neuralnetworks/utils/service/include/nnapi/hal/Service.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_SERVICE_H
+#define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_SERVICE_H
+
+#include <nnapi/IDevice.h>
+#include <nnapi/Types.h>
+#include <memory>
+#include <vector>
+
+namespace android::nn::hal {
+
+std::vector<nn::SharedDevice> getDevices();
+
+}  // namespace android::nn::hal
+
+#endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_SERVICE_H
diff --git a/neuralnetworks/utils/service/src/Service.cpp b/neuralnetworks/utils/service/src/Service.cpp
new file mode 100644
index 0000000..a59549d
--- /dev/null
+++ b/neuralnetworks/utils/service/src/Service.cpp
@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "Service.h"
+
+#include <android-base/logging.h>
+#include <android/hardware/neuralnetworks/1.0/IDevice.h>
+#include <android/hardware/neuralnetworks/1.1/IDevice.h>
+#include <android/hardware/neuralnetworks/1.2/IDevice.h>
+#include <android/hardware/neuralnetworks/1.3/IDevice.h>
+#include <android/hidl/manager/1.2/IServiceManager.h>
+#include <hidl/ServiceManagement.h>
+#include <nnapi/IDevice.h>
+#include <nnapi/Result.h>
+#include <nnapi/TypeUtils.h>
+#include <nnapi/Types.h>
+#include <nnapi/hal/1.0/Service.h>
+#include <nnapi/hal/1.1/Service.h>
+#include <nnapi/hal/1.2/Service.h>
+#include <nnapi/hal/1.3/Service.h>
+
+#include <functional>
+#include <memory>
+#include <string>
+#include <type_traits>
+#include <unordered_set>
+#include <vector>
+
+namespace android::hardware::neuralnetworks::service {
+namespace {
+
+using getDeviceFn = std::add_pointer_t<nn::GeneralResult<nn::SharedDevice>(const std::string&)>;
+
+void getDevicesForVersion(const std::string& descriptor, getDeviceFn getDevice,
+                          std::vector<nn::SharedDevice>* devices,
+                          std::unordered_set<std::string>* registeredDevices) {
+    CHECK(devices != nullptr);
+    CHECK(registeredDevices != nullptr);
+
+    const auto names = getAllHalInstanceNames(descriptor);
+    for (const auto& name : names) {
+        if (const auto [it, unregistered] = registeredDevices->insert(name); unregistered) {
+            auto maybeDevice = getDevice(name);
+            if (maybeDevice.has_value()) {
+                auto device = std::move(maybeDevice).value();
+                CHECK(device != nullptr);
+                devices->push_back(std::move(device));
+            } else {
+                LOG(ERROR) << "getDevice(" << name << ") failed with " << maybeDevice.error().code
+                           << ": " << maybeDevice.error().message;
+            }
+        }
+    }
+}
+
+std::vector<nn::SharedDevice> getDevices() {
+    std::vector<nn::SharedDevice> devices;
+    std::unordered_set<std::string> registeredDevices;
+
+    getDevicesForVersion(V1_3::IDevice::descriptor, &V1_3::utils::getDevice, &devices,
+                         &registeredDevices);
+    getDevicesForVersion(V1_2::IDevice::descriptor, &V1_2::utils::getDevice, &devices,
+                         &registeredDevices);
+    getDevicesForVersion(V1_1::IDevice::descriptor, &V1_1::utils::getDevice, &devices,
+                         &registeredDevices);
+    getDevicesForVersion(V1_0::IDevice::descriptor, &V1_0::utils::getDevice, &devices,
+                         &registeredDevices);
+
+    return devices;
+}
+
+}  // namespace
+}  // namespace android::hardware::neuralnetworks::service
+
+namespace android::nn::hal {
+
+std::vector<nn::SharedDevice> getDevices() {
+    return hardware::neuralnetworks::service::getDevices();
+}
+
+}  // namespace android::nn::hal
diff --git a/sensors/common/default/2.X/Sensor.cpp b/sensors/common/default/2.X/Sensor.cpp
index 1841dff..870980f 100644
--- a/sensors/common/default/2.X/Sensor.cpp
+++ b/sensors/common/default/2.X/Sensor.cpp
@@ -57,11 +57,11 @@
     return mSensorInfo;
 }
 
-void Sensor::batch(int32_t samplingPeriodNs) {
-    if (samplingPeriodNs < mSensorInfo.minDelay * 1000) {
-        samplingPeriodNs = mSensorInfo.minDelay * 1000;
-    } else if (samplingPeriodNs > mSensorInfo.maxDelay * 1000) {
-        samplingPeriodNs = mSensorInfo.maxDelay * 1000;
+void Sensor::batch(int64_t samplingPeriodNs) {
+    if (samplingPeriodNs < mSensorInfo.minDelay * 1000ll) {
+        samplingPeriodNs = mSensorInfo.minDelay * 1000ll;
+    } else if (samplingPeriodNs > mSensorInfo.maxDelay * 1000ll) {
+        samplingPeriodNs = mSensorInfo.maxDelay * 1000ll;
     }
 
     if (mSamplingPeriodNs != samplingPeriodNs) {
@@ -133,6 +133,11 @@
 }
 
 std::vector<Event> Sensor::readEvents() {
+    // For an accelerometer sensor type, default the z-direction
+    // value to -9.8
+    float zValue = (mSensorInfo.type == SensorType::ACCELEROMETER)
+        ? -9.8 : 0.0;
+
     std::vector<Event> events;
     Event event;
     event.sensorHandle = mSensorInfo.sensorHandle;
@@ -140,7 +145,7 @@
     event.timestamp = ::android::elapsedRealtimeNano();
     event.u.vec3.x = 0;
     event.u.vec3.y = 0;
-    event.u.vec3.z = 0;
+    event.u.vec3.z = zValue;
     event.u.vec3.status = SensorStatus::ACCURACY_HIGH;
     events.push_back(event);
     return events;
@@ -330,25 +335,6 @@
     mSensorInfo.flags = static_cast<uint32_t>(SensorFlagBits::ON_CHANGE_MODE);
 };
 
-DeviceTempSensor::DeviceTempSensor(int32_t sensorHandle, ISensorsEventCallback* callback)
-    : OnChangeSensor(callback) {
-    mSensorInfo.sensorHandle = sensorHandle;
-    mSensorInfo.name = "Device Temp Sensor";
-    mSensorInfo.vendor = "Vendor String";
-    mSensorInfo.version = 1;
-    mSensorInfo.type = SensorType::TEMPERATURE;
-    mSensorInfo.typeAsString = "";
-    mSensorInfo.maxRange = 80.0f;
-    mSensorInfo.resolution = 0.01f;
-    mSensorInfo.power = 0.001f;
-    mSensorInfo.minDelay = 40 * 1000;  // microseconds
-    mSensorInfo.maxDelay = kDefaultMaxDelayUs;
-    mSensorInfo.fifoReservedEventCount = 0;
-    mSensorInfo.fifoMaxEventCount = 0;
-    mSensorInfo.requiredPermission = "";
-    mSensorInfo.flags = static_cast<uint32_t>(SensorFlagBits::ON_CHANGE_MODE);
-}
-
 RelativeHumiditySensor::RelativeHumiditySensor(int32_t sensorHandle,
                                                ISensorsEventCallback* callback)
     : OnChangeSensor(callback) {
diff --git a/sensors/common/default/2.X/Sensor.h b/sensors/common/default/2.X/Sensor.h
index 2f8a143..a792797 100644
--- a/sensors/common/default/2.X/Sensor.h
+++ b/sensors/common/default/2.X/Sensor.h
@@ -32,7 +32,7 @@
 namespace V2_X {
 namespace implementation {
 
-static constexpr float kDefaultMaxDelayUs = 10 * 1000 * 1000;
+static constexpr int32_t kDefaultMaxDelayUs = 10 * 1000 * 1000;
 
 class ISensorsEventCallback {
   public:
@@ -54,7 +54,7 @@
     virtual ~Sensor();
 
     const SensorInfo& getSensorInfo() const;
-    void batch(int32_t samplingPeriodNs);
+    void batch(int64_t samplingPeriodNs);
     virtual void activate(bool enable);
     Result flush();
 
@@ -113,11 +113,6 @@
     AmbientTempSensor(int32_t sensorHandle, ISensorsEventCallback* callback);
 };
 
-class DeviceTempSensor : public OnChangeSensor {
-  public:
-    DeviceTempSensor(int32_t sensorHandle, ISensorsEventCallback* callback);
-};
-
 class PressureSensor : public Sensor {
   public:
     PressureSensor(int32_t sensorHandle, ISensorsEventCallback* callback);
diff --git a/sensors/common/default/2.X/Sensors.h b/sensors/common/default/2.X/Sensors.h
index ee8240d..8969c0f 100644
--- a/sensors/common/default/2.X/Sensors.h
+++ b/sensors/common/default/2.X/Sensors.h
@@ -64,7 +64,6 @@
         AddSensor<AccelSensor>();
         AddSensor<GyroSensor>();
         AddSensor<AmbientTempSensor>();
-        AddSensor<DeviceTempSensor>();
         AddSensor<PressureSensor>();
         AddSensor<MagnetometerSensor>();
         AddSensor<LightSensor>();
diff --git a/sensors/common/default/2.X/multihal/tests/fake_subhal/Sensor.cpp b/sensors/common/default/2.X/multihal/tests/fake_subhal/Sensor.cpp
index 1efd971..69debb6 100644
--- a/sensors/common/default/2.X/multihal/tests/fake_subhal/Sensor.cpp
+++ b/sensors/common/default/2.X/multihal/tests/fake_subhal/Sensor.cpp
@@ -71,9 +71,10 @@
     return mSensorInfo;
 }
 
-void Sensor::batch(int32_t samplingPeriodNs) {
-    samplingPeriodNs =
-            std::clamp(samplingPeriodNs, mSensorInfo.minDelay * 1000, mSensorInfo.maxDelay * 1000);
+void Sensor::batch(int64_t samplingPeriodNs) {
+    samplingPeriodNs = std::clamp(samplingPeriodNs,
+                                  static_cast<int64_t>(mSensorInfo.minDelay) * 1000,
+                                  static_cast<int64_t>(mSensorInfo.maxDelay) * 1000);
 
     if (mSamplingPeriodNs != samplingPeriodNs) {
         mSamplingPeriodNs = samplingPeriodNs;
@@ -323,17 +324,6 @@
     mSensorInfo.minDelay = 40 * 1000;  // microseconds
 }
 
-DeviceTempSensor::DeviceTempSensor(int32_t sensorHandle, ISensorsEventCallback* callback)
-    : ContinuousSensor(sensorHandle, callback) {
-    mSensorInfo.name = "Device Temp Sensor";
-    mSensorInfo.type = SensorType::TEMPERATURE;
-    mSensorInfo.typeAsString = SENSOR_STRING_TYPE_TEMPERATURE;
-    mSensorInfo.maxRange = 80.0f;
-    mSensorInfo.resolution = 0.01f;
-    mSensorInfo.power = 0.001f;
-    mSensorInfo.minDelay = 40 * 1000;  // microseconds
-}
-
 RelativeHumiditySensor::RelativeHumiditySensor(int32_t sensorHandle,
                                                ISensorsEventCallback* callback)
     : OnChangeSensor(sensorHandle, callback) {
diff --git a/sensors/common/default/2.X/multihal/tests/fake_subhal/Sensor.h b/sensors/common/default/2.X/multihal/tests/fake_subhal/Sensor.h
index 5cf9f83..08c8647 100644
--- a/sensors/common/default/2.X/multihal/tests/fake_subhal/Sensor.h
+++ b/sensors/common/default/2.X/multihal/tests/fake_subhal/Sensor.h
@@ -49,7 +49,7 @@
     virtual ~Sensor();
 
     const SensorInfo& getSensorInfo() const;
-    void batch(int32_t samplingPeriodNs);
+    void batch(int64_t samplingPeriodNs);
     virtual void activate(bool enable);
     Result flush();
 
@@ -114,11 +114,6 @@
     std::vector<Event> readEvents() override;
 };
 
-class DeviceTempSensor : public ContinuousSensor {
-  public:
-    DeviceTempSensor(int32_t sensorHandle, ISensorsEventCallback* callback);
-};
-
 class PressureSensor : public ContinuousSensor {
   public:
     PressureSensor(int32_t sensorHandle, ISensorsEventCallback* callback);
diff --git a/sensors/common/default/2.X/multihal/tests/fake_subhal/SensorsSubHal.h b/sensors/common/default/2.X/multihal/tests/fake_subhal/SensorsSubHal.h
index 1a78e84..353563c 100644
--- a/sensors/common/default/2.X/multihal/tests/fake_subhal/SensorsSubHal.h
+++ b/sensors/common/default/2.X/multihal/tests/fake_subhal/SensorsSubHal.h
@@ -206,7 +206,6 @@
         ISensorsSubHalBase::AddSensor<GyroSensor>();
         ISensorsSubHalBase::AddSensor<MagnetometerSensor>();
         ISensorsSubHalBase::AddSensor<PressureSensor>();
-        ISensorsSubHalBase::AddSensor<DeviceTempSensor>();
     }
 };
 
@@ -231,7 +230,6 @@
         ISensorsSubHalBase::AddSensor<GyroSensor>();
         ISensorsSubHalBase::AddSensor<MagnetometerSensor>();
         ISensorsSubHalBase::AddSensor<PressureSensor>();
-        ISensorsSubHalBase::AddSensor<DeviceTempSensor>();
         ISensorsSubHalBase::AddSensor<AmbientTempSensor>();
         ISensorsSubHalBase::AddSensor<LightSensor>();
         ISensorsSubHalBase::AddSensor<ProximitySensor>();
diff --git a/sensors/common/vts/2_X/VtsHalSensorsV2_XTargetTest.h b/sensors/common/vts/2_X/VtsHalSensorsV2_XTargetTest.h
index e674ddb..f857827 100644
--- a/sensors/common/vts/2_X/VtsHalSensorsV2_XTargetTest.h
+++ b/sensors/common/vts/2_X/VtsHalSensorsV2_XTargetTest.h
@@ -845,7 +845,11 @@
         std::shared_ptr<SensorsTestSharedMemory<SensorTypeVersion, EventType>> mem,
         int32_t* directChannelHandle, bool supportsSharedMemType, bool supportsAnyDirectChannel) {
     char* buffer = mem->getBuffer();
-    memset(buffer, 0xff, mem->getSize());
+    size_t size = mem->getSize();
+
+    if (supportsSharedMemType) {
+        memset(buffer, 0xff, size);
+    }
 
     registerDirectChannel(mem->getSharedMemInfo(), [&](Result result, int32_t channelHandle) {
         if (supportsSharedMemType) {
diff --git a/sensors/common/vts/utils/include/sensors-vts-utils/SensorsHidlTestBase.h b/sensors/common/vts/utils/include/sensors-vts-utils/SensorsHidlTestBase.h
index 03bec87..a8e1996 100644
--- a/sensors/common/vts/utils/include/sensors-vts-utils/SensorsHidlTestBase.h
+++ b/sensors/common/vts/utils/include/sensors-vts-utils/SensorsHidlTestBase.h
@@ -109,7 +109,6 @@
         case SensorTypeT::MAGNETIC_FIELD:
         case SensorTypeT::ORIENTATION:
         case SensorTypeT::PRESSURE:
-        case SensorTypeT::TEMPERATURE:
         case SensorTypeT::GRAVITY:
         case SensorTypeT::LINEAR_ACCELERATION:
         case SensorTypeT::ROTATION_VECTOR:
@@ -145,6 +144,10 @@
         case SensorTypeT::DYNAMIC_SENSOR_META:
             return SensorFlagBits::SPECIAL_REPORTING_MODE;
 
+        case SensorTypeT::TEMPERATURE:
+            ALOGW("Device temperature sensor is deprecated, ignoring for test");
+            return (SensorFlagBits)-1;
+
         default:
             ALOGW("Type %d is not implemented in expectedReportModeForType", (int)type);
             return (SensorFlagBits)-1;
@@ -334,7 +337,7 @@
         usleep(500000);  // sleep 0.5 sec to wait for change rate to happen
         events1 = collectEvents(collectionTimeoutUs, minNEvent, getEnvironment());
 
-        // second collection, without stop sensor
+        // second collection, without stopping the sensor
         ASSERT_EQ(batch(handle, secondCollectionPeriod, batchingPeriodInNs), Result::OK);
 
         usleep(500000);  // sleep 0.5 sec to wait for change rate to happen
diff --git a/tests/extension/vibrator/aidl/default/Android.bp b/tests/extension/vibrator/aidl/default/Android.bp
index ed40d25..80f7727 100644
--- a/tests/extension/vibrator/aidl/default/Android.bp
+++ b/tests/extension/vibrator/aidl/default/Android.bp
@@ -19,7 +19,7 @@
     shared_libs: [
         "libbase",
         "libbinder_ndk",
-        "android.hardware.vibrator-ndk_platform",
-        "android.hardware.tests.extension.vibrator-ndk_platform",
+        "android.hardware.vibrator-unstable-ndk_platform",
+        "android.hardware.tests.extension.vibrator-unstable-ndk_platform",
     ],
 }
diff --git a/usb/gadget/1.2/Android.bp b/usb/gadget/1.2/Android.bp
new file mode 100644
index 0000000..386f00f
--- /dev/null
+++ b/usb/gadget/1.2/Android.bp
@@ -0,0 +1,17 @@
+// This file is autogenerated by hidl-gen -Landroidbp.
+
+hidl_interface {
+    name: "android.hardware.usb.gadget@1.2",
+    root: "android.hardware",
+    srcs: [
+        "types.hal",
+        "IUsbGadget.hal",
+        "IUsbGadgetCallback.hal",
+    ],
+    interfaces: [
+        "android.hardware.usb.gadget@1.0",
+        "android.hardware.usb.gadget@1.1",
+        "android.hidl.base@1.0",
+    ],
+    gen_java: true,
+}
diff --git a/usb/gadget/1.2/IUsbGadget.hal b/usb/gadget/1.2/IUsbGadget.hal
new file mode 100644
index 0000000..5c6e930
--- /dev/null
+++ b/usb/gadget/1.2/IUsbGadget.hal
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.usb.gadget@1.2;
+
+import IUsbGadgetCallback;
+import android.hardware.usb.gadget@1.1::IUsbGadget;
+
+interface IUsbGadget extends @1.1::IUsbGadget {
+    /**
+     * The function is used to query current USB speed.
+     *
+     * @param callback IUsbGadgetCallback::getUsbSpeedCb used to propagate
+     *                 current USB speed.
+     */
+    oneway getUsbSpeed(IUsbGadgetCallback callback);
+};
diff --git a/usb/gadget/1.2/IUsbGadgetCallback.hal b/usb/gadget/1.2/IUsbGadgetCallback.hal
new file mode 100644
index 0000000..4170573
--- /dev/null
+++ b/usb/gadget/1.2/IUsbGadgetCallback.hal
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.usb.gadget@1.2;
+
+import UsbSpeed;
+import android.hardware.usb.gadget@1.0::IUsbGadgetCallback;
+
+interface IUsbGadgetCallback extends @1.0::IUsbGadgetCallback {
+    /**
+     * Used to convey the current USB speed to the caller.
+     * Must be called either when USB state changes due to USB enumeration or
+     * when caller requested for USB speed through getUsbSpeed.
+     *
+     * @param speed USB Speed defined by UsbSpeed showed current USB
+     *              connection speed.
+     */
+    oneway getUsbSpeedCb(UsbSpeed speed);
+};
+
diff --git a/usb/gadget/1.2/default/Android.bp b/usb/gadget/1.2/default/Android.bp
new file mode 100644
index 0000000..9c73a59
--- /dev/null
+++ b/usb/gadget/1.2/default/Android.bp
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+cc_binary {
+    name: "android.hardware.usb.gadget@1.2-service",
+    defaults: ["hidl_defaults"],
+    relative_install_path: "hw",
+    init_rc: ["android.hardware.usb.gadget@1.2-service.rc"],
+    vintf_fragments: ["android.hardware.usb.gadget@1.2-service.xml"],
+    vendor: true,
+    srcs: [
+        "service.cpp",
+        "UsbGadget.cpp",
+    ],
+    shared_libs: [
+        "android.hardware.usb.gadget@1.0",
+        "android.hardware.usb.gadget@1.1",
+        "android.hardware.usb.gadget@1.2",
+        "libbase",
+        "libcutils",
+        "libhardware",
+        "libhidlbase",
+        "liblog",
+        "libutils",
+    ],
+    static_libs: ["libusbconfigfs-2"],
+}
diff --git a/usb/gadget/1.2/default/UsbGadget.cpp b/usb/gadget/1.2/default/UsbGadget.cpp
new file mode 100644
index 0000000..8dd229e
--- /dev/null
+++ b/usb/gadget/1.2/default/UsbGadget.cpp
@@ -0,0 +1,286 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "android.hardware.usb.gadget@1.2-service"
+
+#include "UsbGadget.h"
+#include <dirent.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <sys/inotify.h>
+#include <sys/mount.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+namespace android {
+namespace hardware {
+namespace usb {
+namespace gadget {
+namespace V1_2 {
+namespace implementation {
+
+UsbGadget::UsbGadget() {
+    if (access(OS_DESC_PATH, R_OK) != 0) {
+        ALOGE("configfs setup not done yet");
+        abort();
+    }
+}
+
+void currentFunctionsAppliedCallback(bool functionsApplied, void* payload) {
+    UsbGadget* gadget = (UsbGadget*)payload;
+    gadget->mCurrentUsbFunctionsApplied = functionsApplied;
+}
+
+Return<void> UsbGadget::getCurrentUsbFunctions(const sp<V1_0::IUsbGadgetCallback>& callback) {
+    Return<void> ret = callback->getCurrentUsbFunctionsCb(
+            mCurrentUsbFunctions, mCurrentUsbFunctionsApplied ? Status::FUNCTIONS_APPLIED
+                                                              : Status::FUNCTIONS_NOT_APPLIED);
+    if (!ret.isOk()) ALOGE("Call to getCurrentUsbFunctionsCb failed %s", ret.description().c_str());
+
+    return Void();
+}
+
+Return<void> UsbGadget::getUsbSpeed(const sp<V1_2::IUsbGadgetCallback>& callback) {
+    std::string current_speed;
+    if (ReadFileToString(SPEED_PATH, &current_speed)) {
+        current_speed = Trim(current_speed);
+        ALOGI("current USB speed is %s", current_speed.c_str());
+        if (current_speed == "low-speed")
+            mUsbSpeed = UsbSpeed::LOWSPEED;
+        else if (current_speed == "full-speed")
+            mUsbSpeed = UsbSpeed::FULLSPEED;
+        else if (current_speed == "high-speed")
+            mUsbSpeed = UsbSpeed::HIGHSPEED;
+        else if (current_speed == "super-speed")
+            mUsbSpeed = UsbSpeed::SUPERSPEED;
+        else if (current_speed == "super-speed-plus")
+            mUsbSpeed = UsbSpeed::SUPERSPEED_10Gb;
+        else if (current_speed == "UNKNOWN")
+            mUsbSpeed = UsbSpeed::UNKNOWN;
+        else {
+            /**
+             * This part is used for USB4 or reserved speed.
+             *
+             * If reserved speed is detected, it needs to convert to other speeds.
+             * For example:
+             * If the bandwidth of new speed is 7G, adding new if
+             * statement and set mUsbSpeed to SUPERSPEED.
+             * If the bandwidth of new speed is 80G, adding new if
+             * statement and set mUsbSpeed to USB4_GEN3_40Gb.
+             */
+            mUsbSpeed = UsbSpeed::RESERVED_SPEED;
+        }
+    } else {
+        ALOGE("Fail to read current speed");
+        mUsbSpeed = UsbSpeed::UNKNOWN;
+    }
+
+    if (callback) {
+        Return<void> ret = callback->getUsbSpeedCb(mUsbSpeed);
+
+        if (!ret.isOk()) ALOGE("Call to getUsbSpeedCb failed %s", ret.description().c_str());
+    }
+
+    return Void();
+}
+
+V1_0::Status UsbGadget::tearDownGadget() {
+    if (resetGadget() != V1_0::Status::SUCCESS) return V1_0::Status::ERROR;
+
+    if (monitorFfs.isMonitorRunning()) {
+        monitorFfs.reset();
+    } else {
+        ALOGI("mMonitor not running");
+    }
+    return V1_0::Status::SUCCESS;
+}
+
+Return<Status> UsbGadget::reset() {
+    if (!WriteStringToFile("none", PULLUP_PATH)) {
+        ALOGI("Gadget cannot be pulled down");
+        return Status::ERROR;
+    }
+
+    usleep(kDisconnectWaitUs);
+
+    if (!WriteStringToFile(kGadgetName, PULLUP_PATH)) {
+        ALOGI("Gadget cannot be pulled up");
+        return Status::ERROR;
+    }
+
+    return Status::SUCCESS;
+}
+
+static V1_0::Status validateAndSetVidPid(uint64_t functions) {
+    V1_0::Status ret = V1_0::Status::SUCCESS;
+
+    switch (functions) {
+        case static_cast<uint64_t>(V1_2::GadgetFunction::MTP):
+            ret = setVidPid("0x18d1", "0x4ee1");
+            break;
+        case V1_2::GadgetFunction::ADB | V1_2::GadgetFunction::MTP:
+            ret = setVidPid("0x18d1", "0x4ee2");
+            break;
+        case static_cast<uint64_t>(V1_2::GadgetFunction::RNDIS):
+            ret = setVidPid("0x18d1", "0x4ee3");
+            break;
+        case V1_2::GadgetFunction::ADB | V1_2::GadgetFunction::RNDIS:
+            ret = setVidPid("0x18d1", "0x4ee4");
+            break;
+        case static_cast<uint64_t>(V1_2::GadgetFunction::PTP):
+            ret = setVidPid("0x18d1", "0x4ee5");
+            break;
+        case V1_2::GadgetFunction::ADB | V1_2::GadgetFunction::PTP:
+            ret = setVidPid("0x18d1", "0x4ee6");
+            break;
+        case static_cast<uint64_t>(V1_2::GadgetFunction::ADB):
+            ret = setVidPid("0x18d1", "0x4ee7");
+            break;
+        case static_cast<uint64_t>(V1_2::GadgetFunction::MIDI):
+            ret = setVidPid("0x18d1", "0x4ee8");
+            break;
+        case V1_2::GadgetFunction::ADB | V1_2::GadgetFunction::MIDI:
+            ret = setVidPid("0x18d1", "0x4ee9");
+            break;
+        case static_cast<uint64_t>(V1_2::GadgetFunction::NCM):
+            ret = setVidPid("0x18d1", "0x4eeb");
+            break;
+        case V1_2::GadgetFunction::ADB | V1_2::GadgetFunction::NCM:
+            ret = setVidPid("0x18d1", "0x4eec");
+            break;
+        case static_cast<uint64_t>(V1_2::GadgetFunction::ACCESSORY):
+            ret = setVidPid("0x18d1", "0x2d00");
+            break;
+        case V1_2::GadgetFunction::ADB | V1_2::GadgetFunction::ACCESSORY:
+            ret = setVidPid("0x18d1", "0x2d01");
+            break;
+        case static_cast<uint64_t>(V1_2::GadgetFunction::AUDIO_SOURCE):
+            ret = setVidPid("0x18d1", "0x2d02");
+            break;
+        case V1_2::GadgetFunction::ADB | V1_2::GadgetFunction::AUDIO_SOURCE:
+            ret = setVidPid("0x18d1", "0x2d03");
+            break;
+        case V1_2::GadgetFunction::ACCESSORY | V1_2::GadgetFunction::AUDIO_SOURCE:
+            ret = setVidPid("0x18d1", "0x2d04");
+            break;
+        case V1_2::GadgetFunction::ADB | V1_2::GadgetFunction::ACCESSORY |
+                V1_2::GadgetFunction::AUDIO_SOURCE:
+            ret = setVidPid("0x18d1", "0x2d05");
+            break;
+        default:
+            ALOGE("Combination not supported");
+            ret = V1_0::Status::CONFIGURATION_NOT_SUPPORTED;
+    }
+    return ret;
+}
+
+V1_0::Status UsbGadget::setupFunctions(uint64_t functions,
+                                       const sp<V1_0::IUsbGadgetCallback>& callback,
+                                       uint64_t timeout) {
+    bool ffsEnabled = false;
+    int i = 0;
+
+    if (addGenericAndroidFunctions(&monitorFfs, functions, &ffsEnabled, &i) !=
+        V1_0::Status::SUCCESS)
+        return V1_0::Status::ERROR;
+
+    if ((functions & V1_2::GadgetFunction::ADB) != 0) {
+        ffsEnabled = true;
+        if (addAdb(&monitorFfs, &i) != V1_0::Status::SUCCESS) return V1_0::Status::ERROR;
+    }
+
+    // Pull up the gadget right away when there are no ffs functions.
+    if (!ffsEnabled) {
+        if (!WriteStringToFile(kGadgetName, PULLUP_PATH)) return V1_0::Status::ERROR;
+        mCurrentUsbFunctionsApplied = true;
+        if (callback) callback->setCurrentUsbFunctionsCb(functions, V1_0::Status::SUCCESS);
+        return V1_0::Status::SUCCESS;
+    }
+
+    monitorFfs.registerFunctionsAppliedCallback(&currentFunctionsAppliedCallback, this);
+    // Monitors the ffs paths to pull up the gadget when descriptors are written.
+    // Also takes of the pulling up the gadget again if the userspace process
+    // dies and restarts.
+    monitorFfs.startMonitor();
+
+    if (kDebug) ALOGI("Mainthread in Cv");
+
+    if (callback) {
+        bool pullup = monitorFfs.waitForPullUp(timeout);
+        Return<void> ret = callback->setCurrentUsbFunctionsCb(
+                functions, pullup ? V1_0::Status::SUCCESS : V1_0::Status::ERROR);
+        if (!ret.isOk()) ALOGE("setCurrentUsbFunctionsCb error %s", ret.description().c_str());
+    }
+
+    return V1_0::Status::SUCCESS;
+}
+
+Return<void> UsbGadget::setCurrentUsbFunctions(uint64_t functions,
+                                               const sp<V1_0::IUsbGadgetCallback>& callback,
+                                               uint64_t timeout) {
+    std::unique_lock<std::mutex> lk(mLockSetCurrentFunction);
+
+    mCurrentUsbFunctions = functions;
+    mCurrentUsbFunctionsApplied = false;
+
+    // Unlink the gadget and stop the monitor if running.
+    V1_0::Status status = tearDownGadget();
+    if (status != V1_0::Status::SUCCESS) {
+        goto error;
+    }
+
+    ALOGI("Returned from tearDown gadget");
+
+    // Leave the gadget pulled down to give time for the host to sense disconnect.
+    usleep(kDisconnectWaitUs);
+
+    if (functions == static_cast<uint64_t>(V1_2::GadgetFunction::NONE)) {
+        if (callback == NULL) return Void();
+        Return<void> ret = callback->setCurrentUsbFunctionsCb(functions, V1_0::Status::SUCCESS);
+        if (!ret.isOk())
+            ALOGE("Error while calling setCurrentUsbFunctionsCb %s", ret.description().c_str());
+        return Void();
+    }
+
+    status = validateAndSetVidPid(functions);
+
+    if (status != V1_0::Status::SUCCESS) {
+        goto error;
+    }
+
+    status = setupFunctions(functions, callback, timeout);
+    if (status != V1_0::Status::SUCCESS) {
+        goto error;
+    }
+
+    ALOGI("Usb Gadget setcurrent functions called successfully");
+    return Void();
+
+error:
+    ALOGI("Usb Gadget setcurrent functions failed");
+    if (callback == NULL) return Void();
+    Return<void> ret = callback->setCurrentUsbFunctionsCb(functions, status);
+    if (!ret.isOk())
+        ALOGE("Error while calling setCurrentUsbFunctionsCb %s", ret.description().c_str());
+    return Void();
+}
+}  // namespace implementation
+}  // namespace V1_2
+}  // namespace gadget
+}  // namespace usb
+}  // namespace hardware
+}  // namespace android
diff --git a/usb/gadget/1.2/default/UsbGadget.h b/usb/gadget/1.2/default/UsbGadget.h
new file mode 100644
index 0000000..12ad8ee
--- /dev/null
+++ b/usb/gadget/1.2/default/UsbGadget.h
@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HARDWARE_USB_GADGET_V1_2_USBGADGET_H
+#define ANDROID_HARDWARE_USB_GADGET_V1_2_USBGADGET_H
+
+#include <UsbGadgetCommon.h>
+#include <android-base/file.h>
+#include <android-base/properties.h>
+#include <android-base/strings.h>
+#include <android-base/unique_fd.h>
+#include <android/hardware/usb/gadget/1.2/IUsbGadget.h>
+#include <android/hardware/usb/gadget/1.2/types.h>
+#include <hidl/MQDescriptor.h>
+#include <hidl/Status.h>
+#include <sys/epoll.h>
+#include <sys/eventfd.h>
+#include <utils/Log.h>
+#include <chrono>
+#include <condition_variable>
+#include <mutex>
+#include <string>
+#include <thread>
+
+namespace android {
+namespace hardware {
+namespace usb {
+namespace gadget {
+namespace V1_2 {
+namespace implementation {
+
+using ::android::sp;
+using ::android::base::GetProperty;
+using ::android::base::ReadFileToString;
+using ::android::base::SetProperty;
+using ::android::base::Trim;
+using ::android::base::unique_fd;
+using ::android::base::WriteStringToFile;
+using ::android::hardware::hidl_array;
+using ::android::hardware::hidl_memory;
+using ::android::hardware::hidl_string;
+using ::android::hardware::hidl_vec;
+using ::android::hardware::Return;
+using ::android::hardware::Void;
+using ::android::hardware::usb::gadget::addAdb;
+using ::android::hardware::usb::gadget::addEpollFd;
+using ::android::hardware::usb::gadget::getVendorFunctions;
+using ::android::hardware::usb::gadget::kDebug;
+using ::android::hardware::usb::gadget::kDisconnectWaitUs;
+using ::android::hardware::usb::gadget::linkFunction;
+using ::android::hardware::usb::gadget::MonitorFfs;
+using ::android::hardware::usb::gadget::resetGadget;
+using ::android::hardware::usb::gadget::setVidPid;
+using ::android::hardware::usb::gadget::unlinkFunctions;
+using ::std::string;
+
+constexpr char kGadgetName[] = "11110000.usb";
+static MonitorFfs monitorFfs(kGadgetName);
+
+#define UDC_PATH "/sys/class/udc/11110000.usb/"
+#define SPEED_PATH UDC_PATH "current_speed"
+
+struct UsbGadget : public IUsbGadget {
+    UsbGadget();
+
+    // Makes sure that only one request is processed at a time.
+    std::mutex mLockSetCurrentFunction;
+    uint64_t mCurrentUsbFunctions;
+    bool mCurrentUsbFunctionsApplied;
+    UsbSpeed mUsbSpeed;
+
+    Return<void> setCurrentUsbFunctions(uint64_t functions,
+                                        const sp<V1_0::IUsbGadgetCallback>& callback,
+                                        uint64_t timeout) override;
+
+    Return<void> getCurrentUsbFunctions(const sp<V1_0::IUsbGadgetCallback>& callback) override;
+
+    Return<Status> reset() override;
+
+    Return<void> getUsbSpeed(const sp<V1_2::IUsbGadgetCallback>& callback) override;
+
+  private:
+    V1_0::Status tearDownGadget();
+    V1_0::Status setupFunctions(uint64_t functions, const sp<V1_0::IUsbGadgetCallback>& callback,
+                                uint64_t timeout);
+};
+
+}  // namespace implementation
+}  // namespace V1_2
+}  // namespace gadget
+}  // namespace usb
+}  // namespace hardware
+}  // namespace android
+
+#endif  // ANDROID_HARDWARE_USB_V1_2_USBGADGET_H
diff --git a/usb/gadget/1.2/default/android.hardware.usb.gadget@1.2-service.rc b/usb/gadget/1.2/default/android.hardware.usb.gadget@1.2-service.rc
new file mode 100644
index 0000000..650b085
--- /dev/null
+++ b/usb/gadget/1.2/default/android.hardware.usb.gadget@1.2-service.rc
@@ -0,0 +1,7 @@
+service vendor.usb-gadget-hal-1-2 /vendor/bin/hw/android.hardware.usb.gadget@1.2-service
+    interface android.hardware.usb.gadget@1.0::IUsbGadget default
+    interface android.hardware.usb.gadget@1.1::IUsbGadget default
+    interface android.hardware.usb.gadget@1.2::IUsbGadget default
+    class hal
+    user system
+    group system shell mtp
diff --git a/usb/gadget/1.2/default/android.hardware.usb.gadget@1.2-service.xml b/usb/gadget/1.2/default/android.hardware.usb.gadget@1.2-service.xml
new file mode 100644
index 0000000..8557f6f
--- /dev/null
+++ b/usb/gadget/1.2/default/android.hardware.usb.gadget@1.2-service.xml
@@ -0,0 +1,11 @@
+<manifest version="1.0" type="device">
+    <hal format="hidl">
+        <name>android.hardware.usb.gadget</name>
+        <transport>hwbinder</transport>
+        <version>1.2</version>
+        <interface>
+            <name>IUsbGadget</name>
+            <instance>default</instance>
+        </interface>
+    </hal>
+</manifest>
diff --git a/usb/gadget/1.2/default/lib/Android.bp b/usb/gadget/1.2/default/lib/Android.bp
new file mode 100644
index 0000000..727de13
--- /dev/null
+++ b/usb/gadget/1.2/default/lib/Android.bp
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+cc_library_static {
+    name: "libusbconfigfs-2",
+    vendor_available: true,
+    export_include_dirs: ["include"],
+
+    srcs: [
+        "UsbGadgetUtils.cpp",
+        "MonitorFfs.cpp",
+    ],
+
+    cflags: [
+        "-Wall",
+        "-Werror",
+    ],
+
+    shared_libs: [
+        "android.hardware.usb.gadget@1.0",
+        "android.hardware.usb.gadget@1.1",
+        "android.hardware.usb.gadget@1.2",
+        "libbase",
+        "libcutils",
+        "libhidlbase",
+        "libutils",
+    ],
+}
diff --git a/usb/gadget/1.2/default/lib/MonitorFfs.cpp b/usb/gadget/1.2/default/lib/MonitorFfs.cpp
new file mode 100644
index 0000000..0cdf038
--- /dev/null
+++ b/usb/gadget/1.2/default/lib/MonitorFfs.cpp
@@ -0,0 +1,269 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "libusbconfigfs"
+
+#include "include/UsbGadgetCommon.h"
+
+namespace android {
+namespace hardware {
+namespace usb {
+namespace gadget {
+
+static volatile bool gadgetPullup;
+
+MonitorFfs::MonitorFfs(const char* const gadget)
+    : mWatchFd(),
+      mEndpointList(),
+      mLock(),
+      mCv(),
+      mLockFd(),
+      mCurrentUsbFunctionsApplied(false),
+      mMonitor(),
+      mCallback(NULL),
+      mPayload(NULL),
+      mGadgetName(gadget),
+      mMonitorRunning(false) {
+    unique_fd eventFd(eventfd(0, 0));
+    if (eventFd == -1) {
+        ALOGE("mEventFd failed to create %d", errno);
+        abort();
+    }
+
+    unique_fd epollFd(epoll_create(2));
+    if (epollFd == -1) {
+        ALOGE("mEpollFd failed to create %d", errno);
+        abort();
+    }
+
+    unique_fd inotifyFd(inotify_init());
+    if (inotifyFd < 0) {
+        ALOGE("inotify init failed");
+        abort();
+    }
+
+    if (addEpollFd(epollFd, inotifyFd) == -1) abort();
+
+    if (addEpollFd(epollFd, eventFd) == -1) abort();
+
+    mEpollFd = move(epollFd);
+    mInotifyFd = move(inotifyFd);
+    mEventFd = move(eventFd);
+    gadgetPullup = false;
+}
+
+static void displayInotifyEvent(struct inotify_event* i) {
+    ALOGE("    wd =%2d; ", i->wd);
+    if (i->cookie > 0) ALOGE("cookie =%4d; ", i->cookie);
+
+    ALOGE("mask = ");
+    if (i->mask & IN_ACCESS) ALOGE("IN_ACCESS ");
+    if (i->mask & IN_ATTRIB) ALOGE("IN_ATTRIB ");
+    if (i->mask & IN_CLOSE_NOWRITE) ALOGE("IN_CLOSE_NOWRITE ");
+    if (i->mask & IN_CLOSE_WRITE) ALOGE("IN_CLOSE_WRITE ");
+    if (i->mask & IN_CREATE) ALOGE("IN_CREATE ");
+    if (i->mask & IN_DELETE) ALOGE("IN_DELETE ");
+    if (i->mask & IN_DELETE_SELF) ALOGE("IN_DELETE_SELF ");
+    if (i->mask & IN_IGNORED) ALOGE("IN_IGNORED ");
+    if (i->mask & IN_ISDIR) ALOGE("IN_ISDIR ");
+    if (i->mask & IN_MODIFY) ALOGE("IN_MODIFY ");
+    if (i->mask & IN_MOVE_SELF) ALOGE("IN_MOVE_SELF ");
+    if (i->mask & IN_MOVED_FROM) ALOGE("IN_MOVED_FROM ");
+    if (i->mask & IN_MOVED_TO) ALOGE("IN_MOVED_TO ");
+    if (i->mask & IN_OPEN) ALOGE("IN_OPEN ");
+    if (i->mask & IN_Q_OVERFLOW) ALOGE("IN_Q_OVERFLOW ");
+    if (i->mask & IN_UNMOUNT) ALOGE("IN_UNMOUNT ");
+    ALOGE("\n");
+
+    if (i->len > 0) ALOGE("        name = %s\n", i->name);
+}
+
+void* MonitorFfs::startMonitorFd(void* param) {
+    MonitorFfs* monitorFfs = (MonitorFfs*)param;
+    char buf[kBufferSize];
+    bool writeUdc = true, stopMonitor = false;
+    struct epoll_event events[kEpollEvents];
+    steady_clock::time_point disconnect;
+
+    bool descriptorWritten = true;
+    for (int i = 0; i < static_cast<int>(monitorFfs->mEndpointList.size()); i++) {
+        if (access(monitorFfs->mEndpointList.at(i).c_str(), R_OK)) {
+            descriptorWritten = false;
+            break;
+        }
+    }
+
+    // notify here if the endpoints are already present.
+    if (descriptorWritten) {
+        usleep(kPullUpDelay);
+        if (!!WriteStringToFile(monitorFfs->mGadgetName, PULLUP_PATH)) {
+            lock_guard<mutex> lock(monitorFfs->mLock);
+            monitorFfs->mCurrentUsbFunctionsApplied = true;
+            monitorFfs->mCallback(monitorFfs->mCurrentUsbFunctionsApplied, monitorFfs->mPayload);
+            gadgetPullup = true;
+            writeUdc = false;
+            ALOGI("GADGET pulled up");
+            monitorFfs->mCv.notify_all();
+        }
+    }
+
+    while (!stopMonitor) {
+        int nrEvents = epoll_wait(monitorFfs->mEpollFd, events, kEpollEvents, -1);
+
+        if (nrEvents <= 0) {
+            ALOGE("epoll wait did not return descriptor number");
+            continue;
+        }
+
+        for (int i = 0; i < nrEvents; i++) {
+            ALOGI("event=%u on fd=%d\n", events[i].events, events[i].data.fd);
+
+            if (events[i].data.fd == monitorFfs->mInotifyFd) {
+                // Process all of the events in buffer returned by read().
+                int numRead = read(monitorFfs->mInotifyFd, buf, kBufferSize);
+                for (char* p = buf; p < buf + numRead;) {
+                    struct inotify_event* event = (struct inotify_event*)p;
+                    if (kDebug) displayInotifyEvent(event);
+
+                    p += sizeof(struct inotify_event) + event->len;
+
+                    bool descriptorPresent = true;
+                    for (int j = 0; j < static_cast<int>(monitorFfs->mEndpointList.size()); j++) {
+                        if (access(monitorFfs->mEndpointList.at(j).c_str(), R_OK)) {
+                            if (kDebug) ALOGI("%s absent", monitorFfs->mEndpointList.at(j).c_str());
+                            descriptorPresent = false;
+                            break;
+                        }
+                    }
+
+                    if (!descriptorPresent && !writeUdc) {
+                        if (kDebug) ALOGI("endpoints not up");
+                        writeUdc = true;
+                        disconnect = std::chrono::steady_clock::now();
+                    } else if (descriptorPresent && writeUdc) {
+                        steady_clock::time_point temp = steady_clock::now();
+
+                        if (std::chrono::duration_cast<microseconds>(temp - disconnect).count() <
+                            kPullUpDelay)
+                            usleep(kPullUpDelay);
+
+                        if (!!WriteStringToFile(monitorFfs->mGadgetName, PULLUP_PATH)) {
+                            lock_guard<mutex> lock(monitorFfs->mLock);
+                            monitorFfs->mCurrentUsbFunctionsApplied = true;
+                            monitorFfs->mCallback(monitorFfs->mCurrentUsbFunctionsApplied,
+                                                  monitorFfs->mPayload);
+                            ALOGI("GADGET pulled up");
+                            writeUdc = false;
+                            gadgetPullup = true;
+                            // notify the main thread to signal userspace.
+                            monitorFfs->mCv.notify_all();
+                        }
+                    }
+                }
+            } else {
+                uint64_t flag;
+                read(monitorFfs->mEventFd, &flag, sizeof(flag));
+                if (flag == 100) {
+                    stopMonitor = true;
+                    break;
+                }
+            }
+        }
+    }
+    return NULL;
+}
+
+void MonitorFfs::reset() {
+    lock_guard<mutex> lock(mLockFd);
+    uint64_t flag = 100;
+    unsigned long ret;
+
+    if (mMonitorRunning) {
+        // Stop the monitor thread by writing into signal fd.
+        ret = TEMP_FAILURE_RETRY(write(mEventFd, &flag, sizeof(flag)));
+        if (ret < 0) ALOGE("Error writing eventfd errno=%d", errno);
+
+        ALOGI("mMonitor signalled to exit");
+        mMonitor->join();
+        ALOGI("mMonitor destroyed");
+        mMonitorRunning = false;
+    }
+
+    for (std::vector<int>::size_type i = 0; i != mWatchFd.size(); i++)
+        inotify_rm_watch(mInotifyFd, mWatchFd[i]);
+
+    mEndpointList.clear();
+    gadgetPullup = false;
+    mCallback = NULL;
+    mPayload = NULL;
+}
+
+bool MonitorFfs::startMonitor() {
+    mMonitor = unique_ptr<thread>(new thread(this->startMonitorFd, this));
+    mMonitorRunning = true;
+    return true;
+}
+
+bool MonitorFfs::isMonitorRunning() {
+    return mMonitorRunning;
+}
+
+bool MonitorFfs::waitForPullUp(int timeout_ms) {
+    std::unique_lock<std::mutex> lk(mLock);
+
+    if (gadgetPullup) return true;
+
+    if (mCv.wait_for(lk, timeout_ms * 1ms, [] { return gadgetPullup; })) {
+        ALOGI("monitorFfs signalled true");
+        return true;
+    } else {
+        ALOGI("monitorFfs signalled error");
+        // continue monitoring as the descriptors might be written at a later
+        // point.
+        return false;
+    }
+}
+
+bool MonitorFfs::addInotifyFd(string fd) {
+    lock_guard<mutex> lock(mLockFd);
+    int wfd;
+
+    wfd = inotify_add_watch(mInotifyFd, fd.c_str(), IN_ALL_EVENTS);
+    if (wfd == -1)
+        return false;
+    else
+        mWatchFd.push_back(wfd);
+
+    return true;
+}
+
+void MonitorFfs::addEndPoint(string ep) {
+    lock_guard<mutex> lock(mLockFd);
+
+    mEndpointList.push_back(ep);
+}
+
+void MonitorFfs::registerFunctionsAppliedCallback(void (*callback)(bool functionsApplied,
+                                                                   void* payload),
+                                                  void* payload) {
+    mCallback = callback;
+    mPayload = payload;
+}
+
+}  // namespace gadget
+}  // namespace usb
+}  // namespace hardware
+}  // namespace android
diff --git a/usb/gadget/1.2/default/lib/UsbGadgetUtils.cpp b/usb/gadget/1.2/default/lib/UsbGadgetUtils.cpp
new file mode 100644
index 0000000..8986556
--- /dev/null
+++ b/usb/gadget/1.2/default/lib/UsbGadgetUtils.cpp
@@ -0,0 +1,205 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "libusbconfigfs"
+
+#include "include/UsbGadgetCommon.h"
+
+namespace android {
+namespace hardware {
+namespace usb {
+namespace gadget {
+
+int unlinkFunctions(const char* path) {
+    DIR* config = opendir(path);
+    struct dirent* function;
+    char filepath[kMaxFilePathLength];
+    int ret = 0;
+
+    if (config == NULL) return -1;
+
+    // d_type does not seems to be supported in /config
+    // so filtering by name.
+    while (((function = readdir(config)) != NULL)) {
+        if ((strstr(function->d_name, FUNCTION_NAME) == NULL)) continue;
+        // build the path for each file in the folder.
+        sprintf(filepath, "%s/%s", path, function->d_name);
+        ret = remove(filepath);
+        if (ret) {
+            ALOGE("Unable  remove file %s errno:%d", filepath, errno);
+            break;
+        }
+    }
+
+    closedir(config);
+    return ret;
+}
+
+int addEpollFd(const unique_fd& epfd, const unique_fd& fd) {
+    struct epoll_event event;
+    int ret;
+
+    event.data.fd = fd;
+    event.events = EPOLLIN;
+
+    ret = epoll_ctl(epfd, EPOLL_CTL_ADD, fd, &event);
+    if (ret) ALOGE("epoll_ctl error %d", errno);
+
+    return ret;
+}
+
+int linkFunction(const char* function, int index) {
+    char functionPath[kMaxFilePathLength];
+    char link[kMaxFilePathLength];
+
+    sprintf(functionPath, "%s%s", FUNCTIONS_PATH, function);
+    sprintf(link, "%s%d", FUNCTION_PATH, index);
+    if (symlink(functionPath, link)) {
+        ALOGE("Cannot create symlink %s -> %s errno:%d", link, functionPath, errno);
+        return -1;
+    }
+    return 0;
+}
+
+Status setVidPid(const char* vid, const char* pid) {
+    if (!WriteStringToFile(vid, VENDOR_ID_PATH)) return Status::ERROR;
+
+    if (!WriteStringToFile(pid, PRODUCT_ID_PATH)) return Status::ERROR;
+
+    return Status::SUCCESS;
+}
+
+std::string getVendorFunctions() {
+    if (GetProperty(kBuildType, "") == "user") return "user";
+
+    std::string bootMode = GetProperty(PERSISTENT_BOOT_MODE, "");
+    std::string persistVendorFunctions = GetProperty(kPersistentVendorConfig, "");
+    std::string vendorFunctions = GetProperty(kVendorConfig, "");
+    std::string ret = "";
+
+    if (vendorFunctions != "") {
+        ret = vendorFunctions;
+    } else if (bootMode == "usbradio" || bootMode == "factory" || bootMode == "ffbm-00" ||
+               bootMode == "ffbm-01") {
+        if (persistVendorFunctions != "")
+            ret = persistVendorFunctions;
+        else
+            ret = "diag";
+        // vendor.usb.config will reflect the current configured functions
+        SetProperty(kVendorConfig, ret);
+    }
+
+    return ret;
+}
+
+Status resetGadget() {
+    ALOGI("setCurrentUsbFunctions None");
+
+    if (!WriteStringToFile("none", PULLUP_PATH)) ALOGI("Gadget cannot be pulled down");
+
+    if (!WriteStringToFile("0", DEVICE_CLASS_PATH)) return Status::ERROR;
+
+    if (!WriteStringToFile("0", DEVICE_SUB_CLASS_PATH)) return Status::ERROR;
+
+    if (!WriteStringToFile("0", DEVICE_PROTOCOL_PATH)) return Status::ERROR;
+
+    if (!WriteStringToFile("0", DESC_USE_PATH)) return Status::ERROR;
+
+    if (unlinkFunctions(CONFIG_PATH)) return Status::ERROR;
+
+    return Status::SUCCESS;
+}
+
+Status addGenericAndroidFunctions(MonitorFfs* monitorFfs, uint64_t functions, bool* ffsEnabled,
+                                  int* functionCount) {
+    if (((functions & GadgetFunction::MTP) != 0)) {
+        *ffsEnabled = true;
+        ALOGI("setCurrentUsbFunctions mtp");
+        if (!WriteStringToFile("1", DESC_USE_PATH)) return Status::ERROR;
+
+        if (!monitorFfs->addInotifyFd("/dev/usb-ffs/mtp/")) return Status::ERROR;
+
+        if (linkFunction("ffs.mtp", (*functionCount)++)) return Status::ERROR;
+
+        // Add endpoints to be monitored.
+        monitorFfs->addEndPoint("/dev/usb-ffs/mtp/ep1");
+        monitorFfs->addEndPoint("/dev/usb-ffs/mtp/ep2");
+        monitorFfs->addEndPoint("/dev/usb-ffs/mtp/ep3");
+    } else if (((functions & GadgetFunction::PTP) != 0)) {
+        *ffsEnabled = true;
+        ALOGI("setCurrentUsbFunctions ptp");
+        if (!WriteStringToFile("1", DESC_USE_PATH)) return Status::ERROR;
+
+        if (!monitorFfs->addInotifyFd("/dev/usb-ffs/ptp/")) return Status::ERROR;
+
+        if (linkFunction("ffs.ptp", (*functionCount)++)) return Status::ERROR;
+
+        // Add endpoints to be monitored.
+        monitorFfs->addEndPoint("/dev/usb-ffs/ptp/ep1");
+        monitorFfs->addEndPoint("/dev/usb-ffs/ptp/ep2");
+        monitorFfs->addEndPoint("/dev/usb-ffs/ptp/ep3");
+    }
+
+    if ((functions & GadgetFunction::MIDI) != 0) {
+        ALOGI("setCurrentUsbFunctions MIDI");
+        if (linkFunction("midi.gs5", (*functionCount)++)) return Status::ERROR;
+    }
+
+    if ((functions & GadgetFunction::ACCESSORY) != 0) {
+        ALOGI("setCurrentUsbFunctions Accessory");
+        if (linkFunction("accessory.gs2", (*functionCount)++)) return Status::ERROR;
+    }
+
+    if ((functions & GadgetFunction::AUDIO_SOURCE) != 0) {
+        ALOGI("setCurrentUsbFunctions Audio Source");
+        if (linkFunction("audio_source.gs3", (*functionCount)++)) return Status::ERROR;
+    }
+
+    if ((functions & GadgetFunction::RNDIS) != 0) {
+        ALOGI("setCurrentUsbFunctions rndis");
+        if (linkFunction("gsi.rndis", (*functionCount)++)) return Status::ERROR;
+        std::string rndisFunction = GetProperty(kVendorRndisConfig, "");
+        if (rndisFunction != "") {
+            if (linkFunction(rndisFunction.c_str(), (*functionCount)++)) return Status::ERROR;
+        } else {
+            // link gsi.rndis for older pixel projects
+            if (linkFunction("gsi.rndis", (*functionCount)++)) return Status::ERROR;
+        }
+    }
+
+    if ((functions & GadgetFunction::NCM) != 0) {
+        ALOGI("setCurrentUsbFunctions ncm");
+        if (linkFunction("ncm.gs6", (*functionCount)++)) return Status::ERROR;
+    }
+
+    return Status::SUCCESS;
+}
+
+Status addAdb(MonitorFfs* monitorFfs, int* functionCount) {
+    ALOGI("setCurrentUsbFunctions Adb");
+    if (!monitorFfs->addInotifyFd("/dev/usb-ffs/adb/")) return Status::ERROR;
+
+    if (linkFunction("ffs.adb", (*functionCount)++)) return Status::ERROR;
+    monitorFfs->addEndPoint("/dev/usb-ffs/adb/ep1");
+    monitorFfs->addEndPoint("/dev/usb-ffs/adb/ep2");
+    ALOGI("Service started");
+    return Status::SUCCESS;
+}
+
+}  // namespace gadget
+}  // namespace usb
+}  // namespace hardware
+}  // namespace android
diff --git a/usb/gadget/1.2/default/lib/include/UsbGadgetCommon.h b/usb/gadget/1.2/default/lib/include/UsbGadgetCommon.h
new file mode 100644
index 0000000..18b8101
--- /dev/null
+++ b/usb/gadget/1.2/default/lib/include/UsbGadgetCommon.h
@@ -0,0 +1,179 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef HARDWARE_USB_USBGADGETCOMMON_H
+#define HARDWARE_USB_USBGADGETCOMMON_H
+
+#include <android-base/file.h>
+#include <android-base/properties.h>
+#include <android-base/unique_fd.h>
+
+#include <android/hardware/usb/gadget/1.2/IUsbGadget.h>
+#include <android/hardware/usb/gadget/1.2/types.h>
+
+#include <dirent.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <sys/epoll.h>
+#include <sys/eventfd.h>
+#include <sys/inotify.h>
+#include <sys/mount.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <utils/Log.h>
+#include <chrono>
+#include <condition_variable>
+#include <mutex>
+#include <string>
+#include <thread>
+
+namespace android {
+namespace hardware {
+namespace usb {
+namespace gadget {
+
+constexpr int kBufferSize = 512;
+constexpr int kMaxFilePathLength = 256;
+constexpr int kEpollEvents = 10;
+constexpr bool kDebug = false;
+constexpr int kDisconnectWaitUs = 100000;
+constexpr int kPullUpDelay = 500000;
+constexpr int kShutdownMonitor = 100;
+
+constexpr char kBuildType[] = "ro.build.type";
+constexpr char kPersistentVendorConfig[] = "persist.vendor.usb.usbradio.config";
+constexpr char kVendorConfig[] = "vendor.usb.config";
+constexpr char kVendorRndisConfig[] = "vendor.usb.rndis.config";
+
+#define GADGET_PATH "/config/usb_gadget/g1/"
+#define PULLUP_PATH GADGET_PATH "UDC"
+#define PERSISTENT_BOOT_MODE "ro.bootmode"
+#define VENDOR_ID_PATH GADGET_PATH "idVendor"
+#define PRODUCT_ID_PATH GADGET_PATH "idProduct"
+#define DEVICE_CLASS_PATH GADGET_PATH "bDeviceClass"
+#define DEVICE_SUB_CLASS_PATH GADGET_PATH "bDeviceSubClass"
+#define DEVICE_PROTOCOL_PATH GADGET_PATH "bDeviceProtocol"
+#define DESC_USE_PATH GADGET_PATH "os_desc/use"
+#define OS_DESC_PATH GADGET_PATH "os_desc/b.1"
+#define CONFIG_PATH GADGET_PATH "configs/b.1/"
+#define FUNCTIONS_PATH GADGET_PATH "functions/"
+#define FUNCTION_NAME "function"
+#define FUNCTION_PATH CONFIG_PATH FUNCTION_NAME
+#define RNDIS_PATH FUNCTIONS_PATH "gsi.rndis"
+
+using ::android::base::GetProperty;
+using ::android::base::SetProperty;
+using ::android::base::unique_fd;
+using ::android::base::WriteStringToFile;
+using ::android::hardware::usb::gadget::V1_0::Status;
+using ::android::hardware::usb::gadget::V1_2::GadgetFunction;
+
+using ::std::lock_guard;
+using ::std::move;
+using ::std::mutex;
+using ::std::string;
+using ::std::thread;
+using ::std::unique_ptr;
+using ::std::vector;
+using ::std::chrono::microseconds;
+using ::std::chrono::steady_clock;
+using ::std::literals::chrono_literals::operator""ms;
+
+// MonitorFfs automously manages gadget pullup by monitoring
+// the ep file status. Restarts the usb gadget when the ep
+// owner restarts.
+class MonitorFfs {
+  private:
+    // Monitors the endpoints Inotify events.
+    unique_fd mInotifyFd;
+    // Control pipe for shutting down the mMonitor thread.
+    // mMonitor exits when SHUTDOWN_MONITOR is written into
+    // mEventFd/
+    unique_fd mEventFd;
+    // Pools on mInotifyFd and mEventFd.
+    unique_fd mEpollFd;
+    vector<int> mWatchFd;
+
+    // Maintains the list of Endpoints.
+    vector<string> mEndpointList;
+    // protects the CV.
+    std::mutex mLock;
+    std::condition_variable mCv;
+    // protects mInotifyFd, mEpollFd.
+    std::mutex mLockFd;
+
+    // Flag to maintain the current status of gadget pullup.
+    bool mCurrentUsbFunctionsApplied;
+
+    // Thread object that executes the ep monitoring logic.
+    unique_ptr<thread> mMonitor;
+    // Callback to be invoked when gadget is pulled up.
+    void (*mCallback)(bool functionsApplied, void* payload);
+    void* mPayload;
+    // Name of the USB gadget. Used for pullup.
+    const char* const mGadgetName;
+    // Monitor State
+    bool mMonitorRunning;
+
+  public:
+    MonitorFfs(const char* const gadget);
+    // Inits all the UniqueFds.
+    void reset();
+    // Starts monitoring endpoints and pullup the gadget when
+    // the descriptors are written.
+    bool startMonitor();
+    // Waits for timeout_ms for gadget pull up to happen.
+    // Returns immediately if the gadget is already pulled up.
+    bool waitForPullUp(int timeout_ms);
+    // Adds the given fd to the watch list.
+    bool addInotifyFd(string fd);
+    // Adds the given endpoint to the watch list.
+    void addEndPoint(string ep);
+    // Registers the async callback from the caller to notify the caller
+    // when the gadget pull up happens.
+    void registerFunctionsAppliedCallback(void (*callback)(bool functionsApplied, void*(payload)),
+                                          void* payload);
+    bool isMonitorRunning();
+    // Ep monitoring and the gadget pull up logic.
+    static void* startMonitorFd(void* param);
+};
+
+//**************** Helper functions ************************//
+
+// Adds the given fd to the epollfd(epfd).
+int addEpollFd(const unique_fd& epfd, const unique_fd& fd);
+// Removes all the usb functions link in the specified path.
+int unlinkFunctions(const char* path);
+// Craetes a configfs link for the function.
+int linkFunction(const char* function, int index);
+// Sets the USB VID and PID.
+Status setVidPid(const char* vid, const char* pid);
+// Extracts vendor functions from the vendor init properties.
+std::string getVendorFunctions();
+// Adds Adb to the usb configuration.
+Status addAdb(MonitorFfs* monitorFfs, int* functionCount);
+// Adds all applicable generic android usb functions other than ADB.
+Status addGenericAndroidFunctions(MonitorFfs* monitorFfs, uint64_t functions, bool* ffsEnabled,
+                                  int* functionCount);
+// Pulls down USB gadget.
+Status resetGadget();
+
+}  // namespace gadget
+}  // namespace usb
+}  // namespace hardware
+}  // namespace android
+#endif
diff --git a/usb/gadget/1.2/default/service.cpp b/usb/gadget/1.2/default/service.cpp
new file mode 100644
index 0000000..80c56a6
--- /dev/null
+++ b/usb/gadget/1.2/default/service.cpp
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "android.hardware.usb.gadget@1.2-service"
+
+#include <hidl/HidlTransportSupport.h>
+#include "UsbGadget.h"
+
+using android::sp;
+
+// libhwbinder:
+using android::hardware::configureRpcThreadpool;
+using android::hardware::joinRpcThreadpool;
+
+// Generated HIDL files
+using android::hardware::usb::gadget::V1_2::IUsbGadget;
+using android::hardware::usb::gadget::V1_2::implementation::UsbGadget;
+
+using android::OK;
+using android::status_t;
+
+int main() {
+    configureRpcThreadpool(1, true /*callerWillJoin*/);
+
+    android::sp<IUsbGadget> service = new UsbGadget();
+
+    status_t status = service->registerAsService();
+
+    if (status != OK) {
+        ALOGE("Cannot register USB Gadget HAL service");
+        return 1;
+    }
+
+    ALOGI("USB Gadget HAL Ready.");
+    joinRpcThreadpool();
+    // Under noraml cases, execution will not reach this line.
+    ALOGI("USB Gadget HAL failed to join thread pool.");
+    return 1;
+}
diff --git a/usb/gadget/1.2/types.hal b/usb/gadget/1.2/types.hal
new file mode 100644
index 0000000..a5c079d
--- /dev/null
+++ b/usb/gadget/1.2/types.hal
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.usb.gadget@1.2;
+
+import android.hardware.usb.gadget@1.0::GadgetFunction;
+
+enum GadgetFunction : @1.0::GadgetFunction {
+    /**
+     * NCM - NCM function.
+     */
+    NCM = 1 << 10,
+};
+
+enum UsbSpeed : uint32_t {
+    /**
+     * UNKNOWN - Not Connected or Unsupported Speed
+     */
+    UNKNOWN = -1,
+
+    /**
+     * USB Low Speed
+     */
+    LOWSPEED = 0,
+
+    /**
+     * USB Full Speed
+     */
+    FULLSPEED = 1,
+
+    /**
+     * USB High Speed
+     */
+    HIGHSPEED = 2,
+
+    /**
+     * USB Super Speed
+     */
+    SUPERSPEED = 3,
+
+    /**
+     * USB Super Speed 10Gbps
+     */
+    SUPERSPEED_10Gb = 4,
+
+    /**
+     * USB Super Speed 20Gbps
+     */
+    SUPERSPEED_20Gb = 5,
+
+    /**
+     * USB4 Gen2 x 1 (10Gbps)
+     */
+    USB4_GEN2_10Gb = 6,
+
+    /**
+     * USB4 Gen2 x 2 (20Gbps)
+     */
+    USB4_GEN2_20Gb = 7,
+
+    /**
+     * USB4 Gen3 x 1 (20Gbps)
+     */
+    USB4_GEN3_20Gb = 8,
+
+    /**
+     * USB4 Gen3 x 2 (40Gbps)
+     */
+    USB4_GEN3_40Gb = 9,
+
+    /**
+     * This is a suggestion if needed.
+     *
+     * Reserved Speed -- It is a newer speed after USB4 v1.0 announcement.
+     * If this speed is detected, the HAL implementation should convert current
+     * speed to above speeds which is lower and the closest.
+     */
+    RESERVED_SPEED = 64,
+};
diff --git a/vibrator/aidl/TEST_MAPPING b/vibrator/aidl/TEST_MAPPING
index 5ae32e7..2414b84 100644
--- a/vibrator/aidl/TEST_MAPPING
+++ b/vibrator/aidl/TEST_MAPPING
@@ -2,6 +2,9 @@
   "presubmit": [
     {
       "name": "VtsHalVibratorTargetTest"
+    },
+    {
+      "name": "VtsHalVibratorManagerTargetTest"
     }
   ]
 }
diff --git a/vibrator/aidl/aidl_api/android.hardware.vibrator/current/android/hardware/vibrator/IVibratorManager.aidl b/vibrator/aidl/aidl_api/android.hardware.vibrator/current/android/hardware/vibrator/IVibratorManager.aidl
new file mode 100644
index 0000000..99cd448
--- /dev/null
+++ b/vibrator/aidl/aidl_api/android.hardware.vibrator/current/android/hardware/vibrator/IVibratorManager.aidl
@@ -0,0 +1,35 @@
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
+// edit this file. It looks like you are doing that because you have modified
+// an AIDL interface in a backward-incompatible way, e.g., deleting a function
+// from an interface or a field from a parcelable and it broke the build. That
+// breakage is intended.
+//
+// You must not make a backward incompatible changes to the AIDL files built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.hardware.vibrator;
+@VintfStability
+interface IVibratorManager {
+  int getCapabilities();
+  int[] getVibratorIds();
+  android.hardware.vibrator.IVibrator getVibrator(in int vibratorId);
+  void prepareSynced(in int[] vibratorIds);
+  void triggerSynced(in android.hardware.vibrator.IVibratorCallback callback);
+  void cancelSynced();
+  const int CAP_SYNC = 1;
+  const int CAP_PREPARE_ON = 2;
+  const int CAP_PREPARE_PERFORM = 4;
+  const int CAP_PREPARE_COMPOSE = 8;
+  const int CAP_MIXED_TRIGGER_ON = 16;
+  const int CAP_MIXED_TRIGGER_PERFORM = 32;
+  const int CAP_MIXED_TRIGGER_COMPOSE = 64;
+  const int CAP_TRIGGER_CALLBACK = 128;
+}
diff --git a/vibrator/aidl/android/hardware/vibrator/IVibratorManager.aidl b/vibrator/aidl/android/hardware/vibrator/IVibratorManager.aidl
new file mode 100644
index 0000000..eb5e9cc
--- /dev/null
+++ b/vibrator/aidl/android/hardware/vibrator/IVibratorManager.aidl
@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.vibrator;
+
+import android.hardware.vibrator.IVibrator;
+import android.hardware.vibrator.IVibratorCallback;
+
+@VintfStability
+interface IVibratorManager {
+    /**
+     * Whether prepare/trigger synced are supported.
+     */
+    const int CAP_SYNC = 1 << 0;
+    /**
+     * Whether IVibrator 'on' can be used with 'prepareSynced' function.
+     */
+    const int CAP_PREPARE_ON = 1 << 1;
+    /**
+     * Whether IVibrator 'perform' can be used with 'prepareSynced' function.
+     */
+    const int CAP_PREPARE_PERFORM = 1 << 2;
+    /**
+     * Whether IVibrator 'compose' can be used with 'prepareSynced' function.
+     */
+    const int CAP_PREPARE_COMPOSE = 1 << 3;
+    /**
+     * Whether IVibrator 'on' can be triggered with other functions in sync with 'triggerSynced'.
+     */
+    const int CAP_MIXED_TRIGGER_ON = 1 << 4;
+    /**
+     * Whether IVibrator 'perform' can be triggered with other functions in sync with 'triggerSynced'.
+     */
+    const int CAP_MIXED_TRIGGER_PERFORM = 1 << 5;
+    /**
+     * Whether IVibrator 'compose' can be triggered with other functions in sync with 'triggerSynced'.
+     */
+    const int CAP_MIXED_TRIGGER_COMPOSE = 1 << 6;
+    /**
+     * Whether on w/ IVibratorCallback can be used w/ 'trigerSynced' function.
+     */
+    const int CAP_TRIGGER_CALLBACK = 1 << 7;
+
+    /**
+     * Determine capabilities of the vibrator manager HAL (CAP_* mask)
+     */
+    int getCapabilities();
+
+    /**
+     * List the id of available vibrators. This result should be static and not change.
+     */
+    int[] getVibratorIds();
+
+    /**
+     * Return an available vibrator identified with given id.
+     */
+    IVibrator getVibrator(in int vibratorId);
+
+    /**
+     * Start preparation for a synced vibration
+     *
+     * This function must only be called after the previous synced vibration was triggered or
+     * canceled (through cancelSynced()).
+     *
+     * Doing this operation while any of the specified vibrators is already on is undefined behavior.
+     * Clients should explicitly call off in each vibrator.
+     *
+     * @param vibratorIds ids of the vibrators to play vibrations in sync.
+     */
+    void prepareSynced(in int[] vibratorIds);
+
+    /**
+     * Trigger a prepared synced vibration
+     *
+     * Trigger a previously-started preparation for synced vibration, if any.
+     * A callback is only expected to be supported when getCapabilities CAP_TRIGGER_CALLBACK
+     * is specified.
+     *
+     * @param callback A callback used to inform Frameworks of state change, if supported.
+     */
+    void triggerSynced(in IVibratorCallback callback);
+
+    /**
+     * Cancel preparation of synced vibration
+     *
+     * Cancel a previously-started preparation for synced vibration, if any.
+     */
+    void cancelSynced();
+}
diff --git a/vibrator/aidl/default/Android.bp b/vibrator/aidl/default/Android.bp
index 9e6d9cf..f9d45bb 100644
--- a/vibrator/aidl/default/Android.bp
+++ b/vibrator/aidl/default/Android.bp
@@ -4,10 +4,13 @@
     shared_libs: [
         "libbase",
         "libbinder_ndk",
-        "android.hardware.vibrator-ndk_platform",
+        "android.hardware.vibrator-unstable-ndk_platform",
     ],
     export_include_dirs: ["include"],
-    srcs: ["Vibrator.cpp"],
+    srcs: [
+        "Vibrator.cpp",
+        "VibratorManager.cpp",
+    ],
     visibility: [
         ":__subpackages__",
         "//hardware/interfaces/tests/extension/vibrator:__subpackages__",
@@ -23,7 +26,7 @@
     shared_libs: [
         "libbase",
         "libbinder_ndk",
-        "android.hardware.vibrator-ndk_platform",
+        "android.hardware.vibrator-unstable-ndk_platform",
     ],
     static_libs: [
         "libvibratorexampleimpl",
diff --git a/vibrator/aidl/default/VibratorManager.cpp b/vibrator/aidl/default/VibratorManager.cpp
new file mode 100644
index 0000000..7cf9e6a
--- /dev/null
+++ b/vibrator/aidl/default/VibratorManager.cpp
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "vibrator-impl/VibratorManager.h"
+
+#include <android-base/logging.h>
+#include <thread>
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace vibrator {
+
+static constexpr int32_t kDefaultVibratorId = 1;
+
+ndk::ScopedAStatus VibratorManager::getCapabilities(int32_t* _aidl_return) {
+    LOG(INFO) << "Vibrator manager reporting capabilities";
+    *_aidl_return =
+            IVibratorManager::CAP_SYNC | IVibratorManager::CAP_PREPARE_ON |
+            IVibratorManager::CAP_PREPARE_PERFORM | IVibratorManager::CAP_PREPARE_COMPOSE |
+            IVibratorManager::CAP_MIXED_TRIGGER_ON | IVibratorManager::CAP_MIXED_TRIGGER_PERFORM |
+            IVibratorManager::CAP_MIXED_TRIGGER_COMPOSE | IVibratorManager::CAP_TRIGGER_CALLBACK;
+    return ndk::ScopedAStatus::ok();
+}
+
+ndk::ScopedAStatus VibratorManager::getVibratorIds(std::vector<int32_t>* _aidl_return) {
+    LOG(INFO) << "Vibrator manager getting vibrator ids";
+    *_aidl_return = {kDefaultVibratorId};
+    return ndk::ScopedAStatus::ok();
+}
+
+ndk::ScopedAStatus VibratorManager::getVibrator(int32_t vibratorId,
+                                                std::shared_ptr<IVibrator>* _aidl_return) {
+    LOG(INFO) << "Vibrator manager getting vibrator " << vibratorId;
+    if (vibratorId == kDefaultVibratorId) {
+        *_aidl_return = mDefaultVibrator;
+        return ndk::ScopedAStatus::ok();
+    } else {
+        *_aidl_return = nullptr;
+        return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+    }
+}
+
+ndk::ScopedAStatus VibratorManager::prepareSynced(const std::vector<int32_t>& vibratorIds) {
+    LOG(INFO) << "Vibrator Manager prepare synced";
+    if (vibratorIds.size() == 1 && vibratorIds[0] == kDefaultVibratorId) {
+        return ndk::ScopedAStatus::ok();
+    } else {
+        return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+    }
+}
+
+ndk::ScopedAStatus VibratorManager::triggerSynced(
+        const std::shared_ptr<IVibratorCallback>& callback) {
+    LOG(INFO) << "Vibrator Manager trigger synced";
+    std::thread([=] {
+        if (callback != nullptr) {
+            LOG(INFO) << "Notifying perform complete";
+            callback->onComplete();
+        }
+    }).detach();
+
+    return ndk::ScopedAStatus::ok();
+}
+
+ndk::ScopedAStatus VibratorManager::cancelSynced() {
+    LOG(INFO) << "Vibrator Manager cancel synced";
+    return ndk::ScopedAStatus::ok();
+}
+
+}  // namespace vibrator
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl
diff --git a/vibrator/aidl/default/include/vibrator-impl/VibratorManager.h b/vibrator/aidl/default/include/vibrator-impl/VibratorManager.h
new file mode 100644
index 0000000..319eb05
--- /dev/null
+++ b/vibrator/aidl/default/include/vibrator-impl/VibratorManager.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <aidl/android/hardware/vibrator/BnVibratorManager.h>
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace vibrator {
+
+class VibratorManager : public BnVibratorManager {
+  public:
+    VibratorManager(std::shared_ptr<IVibrator> vibrator) : mDefaultVibrator(std::move(vibrator)){};
+    ndk::ScopedAStatus getCapabilities(int32_t* _aidl_return) override;
+    ndk::ScopedAStatus getVibratorIds(std::vector<int32_t>* _aidl_return) override;
+    ndk::ScopedAStatus getVibrator(int32_t vibratorId,
+                                   std::shared_ptr<IVibrator>* _aidl_return) override;
+    ndk::ScopedAStatus prepareSynced(const std::vector<int32_t>& vibratorIds) override;
+    ndk::ScopedAStatus triggerSynced(const std::shared_ptr<IVibratorCallback>& callback) override;
+    ndk::ScopedAStatus cancelSynced() override;
+
+  private:
+    std::shared_ptr<IVibrator> mDefaultVibrator;
+};
+
+}  // namespace vibrator
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl
diff --git a/vibrator/aidl/default/main.cpp b/vibrator/aidl/default/main.cpp
index ebb0905..bd834d2 100644
--- a/vibrator/aidl/default/main.cpp
+++ b/vibrator/aidl/default/main.cpp
@@ -15,19 +15,29 @@
  */
 
 #include "vibrator-impl/Vibrator.h"
+#include "vibrator-impl/VibratorManager.h"
 
 #include <android-base/logging.h>
 #include <android/binder_manager.h>
 #include <android/binder_process.h>
 
 using aidl::android::hardware::vibrator::Vibrator;
+using aidl::android::hardware::vibrator::VibratorManager;
 
 int main() {
     ABinderProcess_setThreadPoolMaxThreadCount(0);
-    std::shared_ptr<Vibrator> vib = ndk::SharedRefBase::make<Vibrator>();
 
-    const std::string instance = std::string() + Vibrator::descriptor + "/default";
-    binder_status_t status = AServiceManager_addService(vib->asBinder().get(), instance.c_str());
+    // make a default vibrator service
+    auto vib = ndk::SharedRefBase::make<Vibrator>();
+    const std::string vibName = std::string() + Vibrator::descriptor + "/default";
+    binder_status_t status = AServiceManager_addService(vib->asBinder().get(), vibName.c_str());
+    CHECK(status == STATUS_OK);
+
+    // make the vibrator manager service with a different vibrator
+    auto managedVib = ndk::SharedRefBase::make<Vibrator>();
+    auto vibManager = ndk::SharedRefBase::make<VibratorManager>(std::move(managedVib));
+    const std::string vibManagerName = std::string() + VibratorManager::descriptor + "/default";
+    status = AServiceManager_addService(vibManager->asBinder().get(), vibManagerName.c_str());
     CHECK(status == STATUS_OK);
 
     ABinderProcess_joinThreadPool();
diff --git a/vibrator/aidl/default/vibrator-default.xml b/vibrator/aidl/default/vibrator-default.xml
index 49b11ec..9f9cd40 100644
--- a/vibrator/aidl/default/vibrator-default.xml
+++ b/vibrator/aidl/default/vibrator-default.xml
@@ -3,4 +3,8 @@
         <name>android.hardware.vibrator</name>
         <fqname>IVibrator/default</fqname>
     </hal>
+    <hal format="aidl">
+        <name>android.hardware.vibrator</name>
+        <fqname>IVibratorManager/default</fqname>
+    </hal>
 </manifest>
diff --git a/vibrator/aidl/vts/Android.bp b/vibrator/aidl/vts/Android.bp
index 28cb4d9..d06b50e 100644
--- a/vibrator/aidl/vts/Android.bp
+++ b/vibrator/aidl/vts/Android.bp
@@ -9,7 +9,26 @@
         "libbinder",
     ],
     static_libs: [
-        "android.hardware.vibrator-cpp",
+        "android.hardware.vibrator-unstable-cpp",
+    ],
+    test_suites: [
+        "general-tests",
+        "vts",
+    ],
+}
+
+cc_test {
+    name: "VtsHalVibratorManagerTargetTest",
+    defaults: [
+        "VtsHalTargetTestDefaults",
+        "use_libaidlvintf_gtest_helper_static",
+    ],
+    srcs: ["VtsHalVibratorManagerTargetTest.cpp"],
+    shared_libs: [
+        "libbinder",
+    ],
+    static_libs: [
+        "android.hardware.vibrator-unstable-cpp",
     ],
     test_suites: [
         "general-tests",
diff --git a/vibrator/aidl/vts/VtsHalVibratorManagerTargetTest.cpp b/vibrator/aidl/vts/VtsHalVibratorManagerTargetTest.cpp
new file mode 100644
index 0000000..9789188
--- /dev/null
+++ b/vibrator/aidl/vts/VtsHalVibratorManagerTargetTest.cpp
@@ -0,0 +1,220 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include <aidl/Gtest.h>
+#include <aidl/Vintf.h>
+
+#include <android/hardware/vibrator/BnVibratorCallback.h>
+#include <android/hardware/vibrator/IVibrator.h>
+#include <android/hardware/vibrator/IVibratorManager.h>
+#include <binder/IServiceManager.h>
+#include <binder/ProcessState.h>
+
+#include <cmath>
+#include <future>
+
+using android::ProcessState;
+using android::sp;
+using android::String16;
+using android::binder::Status;
+using android::hardware::vibrator::BnVibratorCallback;
+using android::hardware::vibrator::CompositeEffect;
+using android::hardware::vibrator::CompositePrimitive;
+using android::hardware::vibrator::Effect;
+using android::hardware::vibrator::EffectStrength;
+using android::hardware::vibrator::IVibrator;
+using android::hardware::vibrator::IVibratorManager;
+using std::chrono::high_resolution_clock;
+
+const std::vector<Effect> kEffects{android::enum_range<Effect>().begin(),
+                                   android::enum_range<Effect>().end()};
+const std::vector<EffectStrength> kEffectStrengths{android::enum_range<EffectStrength>().begin(),
+                                                   android::enum_range<EffectStrength>().end()};
+const std::vector<CompositePrimitive> kPrimitives{android::enum_range<CompositePrimitive>().begin(),
+                                                  android::enum_range<CompositePrimitive>().end()};
+
+class CompletionCallback : public BnVibratorCallback {
+  public:
+    CompletionCallback(const std::function<void()>& callback) : mCallback(callback) {}
+    Status onComplete() override {
+        mCallback();
+        return Status::ok();
+    }
+
+  private:
+    std::function<void()> mCallback;
+};
+
+class VibratorAidl : public testing::TestWithParam<std::string> {
+  public:
+    virtual void SetUp() override {
+        manager = android::waitForDeclaredService<IVibratorManager>(String16(GetParam().c_str()));
+        ASSERT_NE(manager, nullptr);
+        ASSERT_TRUE(manager->getCapabilities(&capabilities).isOk());
+        EXPECT_TRUE(manager->getVibratorIds(&vibratorIds).isOk());
+    }
+
+    sp<IVibratorManager> manager;
+    int32_t capabilities;
+    std::vector<int32_t> vibratorIds;
+};
+
+TEST_P(VibratorAidl, ValidateExistingVibrators) {
+    sp<IVibrator> vibrator;
+    for (auto& id : vibratorIds) {
+        EXPECT_TRUE(manager->getVibrator(id, &vibrator).isOk());
+        ASSERT_NE(vibrator, nullptr);
+    }
+}
+
+TEST_P(VibratorAidl, GetVibratorWithInvalidId) {
+    int32_t invalidId = *max_element(vibratorIds.begin(), vibratorIds.end()) + 1;
+    sp<IVibrator> vibrator;
+    EXPECT_EQ(Status::EX_ILLEGAL_ARGUMENT,
+              manager->getVibrator(invalidId, &vibrator).exceptionCode());
+    ASSERT_EQ(vibrator, nullptr);
+}
+
+TEST_P(VibratorAidl, ValidatePrepareSyncedExistingVibrators) {
+    if (!(capabilities & IVibratorManager::CAP_SYNC)) return;
+    if (vibratorIds.empty()) return;
+    EXPECT_TRUE(manager->prepareSynced(vibratorIds).isOk());
+}
+
+TEST_P(VibratorAidl, PrepareSyncedEmptySetIsInvalid) {
+    if (!(capabilities & IVibratorManager::CAP_SYNC)) return;
+    std::vector<int32_t> emptyIds;
+    EXPECT_EQ(Status::EX_ILLEGAL_ARGUMENT, manager->prepareSynced(emptyIds).exceptionCode());
+}
+
+TEST_P(VibratorAidl, PrepareSyncedNotSupported) {
+    if (!(capabilities & IVibratorManager::CAP_SYNC)) {
+        EXPECT_EQ(Status::EX_UNSUPPORTED_OPERATION,
+                  manager->prepareSynced(vibratorIds).exceptionCode());
+    }
+}
+
+TEST_P(VibratorAidl, PrepareOnNotSupported) {
+    if (vibratorIds.empty()) return;
+    if (!(capabilities & IVibratorManager::CAP_SYNC)) return;
+    if (!(capabilities & IVibratorManager::CAP_PREPARE_ON)) {
+        uint32_t durationMs = 250;
+        EXPECT_TRUE(manager->prepareSynced(vibratorIds).isOk());
+        sp<IVibrator> vibrator;
+        for (auto& id : vibratorIds) {
+            EXPECT_TRUE(manager->getVibrator(id, &vibrator).isOk());
+            ASSERT_NE(vibrator, nullptr);
+            EXPECT_EQ(Status::EX_UNSUPPORTED_OPERATION,
+                      vibrator->on(durationMs, nullptr).exceptionCode());
+        }
+        EXPECT_TRUE(manager->cancelSynced().isOk());
+    }
+}
+
+TEST_P(VibratorAidl, PreparePerformNotSupported) {
+    if (vibratorIds.empty()) return;
+    if (!(capabilities & IVibratorManager::CAP_SYNC)) return;
+    if (!(capabilities & IVibratorManager::CAP_PREPARE_ON)) {
+        EXPECT_TRUE(manager->prepareSynced(vibratorIds).isOk());
+        sp<IVibrator> vibrator;
+        for (auto& id : vibratorIds) {
+            EXPECT_TRUE(manager->getVibrator(id, &vibrator).isOk());
+            ASSERT_NE(vibrator, nullptr);
+            int32_t lengthMs = 0;
+            Status status = vibrator->perform(kEffects[0], kEffectStrengths[0], nullptr, &lengthMs);
+            EXPECT_EQ(Status::EX_UNSUPPORTED_OPERATION, status.exceptionCode());
+        }
+        EXPECT_TRUE(manager->cancelSynced().isOk());
+    }
+}
+
+TEST_P(VibratorAidl, PrepareComposeNotSupported) {
+    if (vibratorIds.empty()) return;
+    if (!(capabilities & IVibratorManager::CAP_SYNC)) return;
+    if (!(capabilities & IVibratorManager::CAP_PREPARE_ON)) {
+        std::vector<CompositeEffect> composite;
+        CompositeEffect effect;
+        effect.delayMs = 10;
+        effect.primitive = kPrimitives[0];
+        effect.scale = 1.0f;
+        composite.emplace_back(effect);
+
+        EXPECT_TRUE(manager->prepareSynced(vibratorIds).isOk());
+        sp<IVibrator> vibrator;
+        for (auto& id : vibratorIds) {
+            EXPECT_TRUE(manager->getVibrator(id, &vibrator).isOk());
+            ASSERT_NE(vibrator, nullptr);
+            Status status = vibrator->compose(composite, nullptr);
+            EXPECT_EQ(Status::EX_UNSUPPORTED_OPERATION, status.exceptionCode());
+        }
+        EXPECT_TRUE(manager->cancelSynced().isOk());
+    }
+}
+
+TEST_P(VibratorAidl, TriggerWithCallback) {
+    if (!(capabilities & IVibratorManager::CAP_SYNC)) return;
+    if (!(capabilities & IVibratorManager::CAP_PREPARE_ON)) return;
+    if (!(capabilities & IVibratorManager::CAP_TRIGGER_CALLBACK)) return;
+    if (vibratorIds.empty()) return;
+
+    std::promise<void> completionPromise;
+    std::future<void> completionFuture{completionPromise.get_future()};
+    sp<CompletionCallback> callback =
+            new CompletionCallback([&completionPromise] { completionPromise.set_value(); });
+    uint32_t durationMs = 250;
+    std::chrono::milliseconds timeout{durationMs * 2};
+
+    EXPECT_TRUE(manager->prepareSynced(vibratorIds).isOk());
+    sp<IVibrator> vibrator;
+    for (auto& id : vibratorIds) {
+        EXPECT_TRUE(manager->getVibrator(id, &vibrator).isOk());
+        ASSERT_NE(vibrator, nullptr);
+        EXPECT_TRUE(vibrator->on(durationMs, nullptr).isOk());
+    }
+
+    EXPECT_TRUE(manager->triggerSynced(callback).isOk());
+    EXPECT_EQ(completionFuture.wait_for(timeout), std::future_status::ready);
+    EXPECT_TRUE(manager->cancelSynced().isOk());
+}
+
+TEST_P(VibratorAidl, TriggerSyncNotSupported) {
+    if (!(capabilities & IVibratorManager::CAP_SYNC)) {
+        EXPECT_EQ(Status::EX_UNSUPPORTED_OPERATION,
+                  manager->triggerSynced(nullptr).exceptionCode());
+    }
+}
+
+TEST_P(VibratorAidl, TriggerCallbackNotSupported) {
+    if (!(capabilities & IVibratorManager::CAP_SYNC)) return;
+    if (!(capabilities & IVibratorManager::CAP_TRIGGER_CALLBACK)) {
+        sp<CompletionCallback> callback = new CompletionCallback([] {});
+        EXPECT_TRUE(manager->prepareSynced(vibratorIds).isOk());
+        EXPECT_EQ(Status::EX_UNSUPPORTED_OPERATION,
+                  manager->triggerSynced(callback).exceptionCode());
+    }
+}
+
+GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(VibratorAidl);
+INSTANTIATE_TEST_SUITE_P(
+        Vibrator, VibratorAidl,
+        testing::ValuesIn(android::getAidlHalInstanceNames(IVibratorManager::descriptor)),
+        android::PrintInstanceNameToString);
+
+int main(int argc, char** argv) {
+    ::testing::InitGoogleTest(&argc, argv);
+    ProcessState::self()->setThreadPoolMaxThreadCount(1);
+    ProcessState::self()->startThreadPool();
+    return RUN_ALL_TESTS();
+}
diff --git a/vibrator/aidl/vts/VtsHalVibratorTargetTest.cpp b/vibrator/aidl/vts/VtsHalVibratorTargetTest.cpp
index 888a403..dfd2524 100644
--- a/vibrator/aidl/vts/VtsHalVibratorTargetTest.cpp
+++ b/vibrator/aidl/vts/VtsHalVibratorTargetTest.cpp
@@ -18,6 +18,7 @@
 
 #include <android/hardware/vibrator/BnVibratorCallback.h>
 #include <android/hardware/vibrator/IVibrator.h>
+#include <android/hardware/vibrator/IVibratorManager.h>
 #include <binder/IServiceManager.h>
 #include <binder/ProcessState.h>
 
@@ -34,6 +35,7 @@
 using android::hardware::vibrator::Effect;
 using android::hardware::vibrator::EffectStrength;
 using android::hardware::vibrator::IVibrator;
+using android::hardware::vibrator::IVibratorManager;
 using std::chrono::high_resolution_clock;
 
 const std::vector<Effect> kEffects{android::enum_range<Effect>().begin(),
@@ -77,10 +79,28 @@
     std::function<void()> mCallback;
 };
 
-class VibratorAidl : public testing::TestWithParam<std::string> {
+class VibratorAidl : public testing::TestWithParam<std::tuple<int32_t, int32_t>> {
   public:
     virtual void SetUp() override {
-        vibrator = android::waitForDeclaredService<IVibrator>(String16(GetParam().c_str()));
+        int32_t managerIdx = std::get<0>(GetParam());
+        int32_t vibratorId = std::get<1>(GetParam());
+        auto managerAidlNames = android::getAidlHalInstanceNames(IVibratorManager::descriptor);
+
+        if (managerIdx < 0) {
+            // Testing a unmanaged vibrator, using vibratorId as index from registered HALs
+            auto vibratorAidlNames = android::getAidlHalInstanceNames(IVibrator::descriptor);
+            ASSERT_LT(vibratorId, vibratorAidlNames.size());
+            auto vibratorName = String16(vibratorAidlNames[vibratorId].c_str());
+            vibrator = android::waitForDeclaredService<IVibrator>(vibratorName);
+        } else {
+            // Testing a managed vibrator, using vibratorId to retrieve it from the manager
+            ASSERT_LT(managerIdx, managerAidlNames.size());
+            auto managerName = String16(managerAidlNames[managerIdx].c_str());
+            auto vibratorManager = android::waitForDeclaredService<IVibratorManager>(managerName);
+            auto vibratorResult = vibratorManager->getVibrator(vibratorId, &vibrator);
+            ASSERT_TRUE(vibratorResult.isOk());
+        }
+
         ASSERT_NE(vibrator, nullptr);
         ASSERT_TRUE(vibrator->getCapabilities(&capabilities).isOk());
     }
@@ -518,10 +538,41 @@
     }
 }
 
+std::vector<std::tuple<int32_t, int32_t>> GenerateVibratorMapping() {
+    std::vector<std::tuple<int32_t, int32_t>> tuples;
+    auto managerAidlNames = android::getAidlHalInstanceNames(IVibratorManager::descriptor);
+    std::vector<int32_t> vibratorIds;
+
+    for (int i = 0; i < managerAidlNames.size(); i++) {
+        auto managerName = String16(managerAidlNames[i].c_str());
+        auto vibratorManager = android::waitForDeclaredService<IVibratorManager>(managerName);
+        if (vibratorManager->getVibratorIds(&vibratorIds).isOk()) {
+            for (auto& vibratorId : vibratorIds) {
+                tuples.push_back(std::make_tuple(i, vibratorId));
+            }
+        }
+    }
+
+    auto vibratorAidlNames = android::getAidlHalInstanceNames(IVibrator::descriptor);
+    for (int i = 0; i < vibratorAidlNames.size(); i++) {
+        tuples.push_back(std::make_tuple(-1, i));
+    }
+
+    return tuples;
+}
+
+std::string PrintGeneratedTest(const testing::TestParamInfo<VibratorAidl::ParamType>& info) {
+    const auto& [managerIdx, vibratorId] = info.param;
+    if (managerIdx < 0) {
+        return std::string("TOP_LEVEL_VIBRATOR_") + std::to_string(vibratorId);
+    }
+    return std::string("MANAGER_") + std::to_string(managerIdx) + "_VIBRATOR_ID_" +
+           std::to_string(vibratorId);
+}
+
 GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(VibratorAidl);
-INSTANTIATE_TEST_SUITE_P(Vibrator, VibratorAidl,
-                         testing::ValuesIn(android::getAidlHalInstanceNames(IVibrator::descriptor)),
-                         android::PrintInstanceNameToString);
+INSTANTIATE_TEST_SUITE_P(Vibrator, VibratorAidl, testing::ValuesIn(GenerateVibratorMapping()),
+                         PrintGeneratedTest);
 
 int main(int argc, char** argv) {
     ::testing::InitGoogleTest(&argc, argv);
diff --git a/wifi/1.5/default/wifi_feature_flags.cpp b/wifi/1.5/default/wifi_feature_flags.cpp
index 9f91bd7..124ba32 100644
--- a/wifi/1.5/default/wifi_feature_flags.cpp
+++ b/wifi/1.5/default/wifi_feature_flags.cpp
@@ -14,6 +14,11 @@
  * limitations under the License.
  */
 
+#include <string>
+
+#include <android-base/logging.h>
+#include <cutils/properties.h>
+
 #include "wifi_feature_flags.h"
 
 namespace android {
@@ -131,7 +136,7 @@
 #define AP IfaceType::AP
 #define P2P IfaceType::P2P
 #define NAN IfaceType::NAN
-static const std::vector<IWifiChip::ChipMode> kChipModes{
+static const std::vector<IWifiChip::ChipMode> kChipModesPrimary{
     {kMainModeId,
      ChipIfaceCombination::make_vec({WIFI_HAL_INTERFACE_COMBINATIONS})},
 #ifdef WIFI_HAL_INTERFACE_COMBINATIONS_AP
@@ -146,6 +151,50 @@
                              {WIFI_HAL_INTERFACE_COMBINATIONS_SECONDARY_CHIP})},
 #endif
 };
+
+constexpr char kDebugPresetInterfaceCombinationIdxProperty[] =
+    "persist.vendor.debug.wifi.hal.preset_interface_combination_idx";
+// List of pre-defined interface combinations that can be enabled at runtime via
+// setting the property: "kDebugPresetInterfaceCombinationIdxProperty" to the
+// corresponding index value.
+static const std::vector<
+    std::pair<std::string, std::vector<IWifiChip::ChipMode>>>
+    kDebugChipModes{
+        // Legacy combination - No STA/AP concurrencies.
+        // 0 - (1 AP) or (1 STA + 1 of (P2P or NAN))
+        {"No STA/AP Concurrency",
+         {{kMainModeId,
+           ChipIfaceCombination::make_vec(
+               {{{{AP}, 1}}, {{{STA}, 1}, {{P2P, NAN}, 1}}})}}},
+
+        // STA + AP concurrency
+        // 1 - (1 STA + 1 AP) or (1 STA + 1 of (P2P or NAN))
+        {"STA + AP Concurrency",
+         {{kMainModeId,
+           ChipIfaceCombination::make_vec(
+               {{{{STA}, 1}, {{AP}, 1}}, {{{STA}, 1}, {{P2P, NAN}, 1}}})}}},
+
+        // STA + STA concurrency
+        // 2 - (1 STA + 1 AP) or (2 STA + 1 of (P2P or NAN))
+        {"Dual STA Concurrency",
+         {{kMainModeId,
+           ChipIfaceCombination::make_vec(
+               {{{{STA}, 1}, {{AP}, 1}}, {{{STA}, 2}, {{P2P, NAN}, 1}}})}}},
+
+        // AP + AP + STA concurrency
+        // 3 - (1 STA + 2 AP) or (1 STA + 1 of (P2P or NAN))
+        {"Dual AP Concurrency",
+         {{kMainModeId,
+           ChipIfaceCombination::make_vec(
+               {{{{STA}, 1}, {{AP}, 2}}, {{{STA}, 1}, {{P2P, NAN}, 1}}})}}},
+
+        // STA + STA concurrency and AP + AP + STA concurrency
+        // 4 - (1 STA + 2 AP) or (2 STA + 1 of (P2P or NAN))
+        {"Dual STA & Dual AP Concurrency",
+         {{kMainModeId,
+           ChipIfaceCombination::make_vec(
+               {{{{STA}, 1}, {{AP}, 2}}, {{{STA}, 2}, {{P2P, NAN}, 1}}})}}}};
+
 #undef STA
 #undef AP
 #undef P2P
@@ -161,9 +210,31 @@
 
 WifiFeatureFlags::WifiFeatureFlags() {}
 
+std::vector<IWifiChip::ChipMode> WifiFeatureFlags::getChipModesForPrimary() {
+    std::array<char, PROPERTY_VALUE_MAX> buffer;
+    auto res = property_get(kDebugPresetInterfaceCombinationIdxProperty,
+                            buffer.data(), nullptr);
+    // Debug propety not set, use the device preset interface combination.
+    if (res <= 0) return kChipModesPrimary;
+
+    // Debug propety set, use one of the debug preset interface combination.
+    unsigned long idx = std::stoul(buffer.data());
+    if (idx >= kDebugChipModes.size()) {
+        LOG(ERROR) << "Invalid index set in property: "
+                   << kDebugPresetInterfaceCombinationIdxProperty;
+        return kChipModesPrimary;
+    }
+    std::string name;
+    std::vector<IWifiChip::ChipMode> chip_modes;
+    std::tie(name, chip_modes) = kDebugChipModes[idx];
+    LOG(INFO) << "Using debug chip mode: <" << name << "> set via property: "
+              << kDebugPresetInterfaceCombinationIdxProperty;
+    return chip_modes;
+}
+
 std::vector<IWifiChip::ChipMode> WifiFeatureFlags::getChipModes(
     bool is_primary) {
-    return (is_primary) ? kChipModes : kChipModesSecondary;
+    return (is_primary) ? getChipModesForPrimary() : kChipModesSecondary;
 }
 
 }  // namespace feature_flags
diff --git a/wifi/1.5/default/wifi_feature_flags.h b/wifi/1.5/default/wifi_feature_flags.h
index cb68b8c..7d561fc 100644
--- a/wifi/1.5/default/wifi_feature_flags.h
+++ b/wifi/1.5/default/wifi_feature_flags.h
@@ -44,6 +44,9 @@
 
     virtual std::vector<V1_0::IWifiChip::ChipMode> getChipModes(
         bool is_primary);
+
+   private:
+    std::vector<V1_0::IWifiChip::ChipMode> getChipModesForPrimary();
 };
 
 }  // namespace feature_flags
diff --git a/wifi/supplicant/1.1/vts/functional/supplicant_hidl_test.cpp b/wifi/supplicant/1.1/vts/functional/supplicant_hidl_test.cpp
index 8d7ea54..a8e72b8 100644
--- a/wifi/supplicant/1.1/vts/functional/supplicant_hidl_test.cpp
+++ b/wifi/supplicant/1.1/vts/functional/supplicant_hidl_test.cpp
@@ -75,7 +75,7 @@
  * AddP2pInterface
  */
 TEST_P(SupplicantHidlTest, AddP2pInterface) {
-    if (isP2pOn_) return;
+    if (!isP2pOn_) return;
     ISupplicant::IfaceInfo iface_info;
     iface_info.name = getP2pIfaceName();
     iface_info.type = IfaceType::P2P;
@@ -115,7 +115,7 @@
  * RemoveP2pInterface
  */
 TEST_P(SupplicantHidlTest, RemoveP2pInterface) {
-    if (isP2pOn_) return;
+    if (!isP2pOn_) return;
     ISupplicant::IfaceInfo iface_info;
     iface_info.name = getP2pIfaceName();
     iface_info.type = IfaceType::P2P;