diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..1d74e21
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.vscode/
diff --git a/audio/aidl/Android.bp b/audio/aidl/Android.bp
new file mode 100644
index 0000000..c172674
--- /dev/null
+++ b/audio/aidl/Android.bp
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2021 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 {
+    // See: http://go/android-license-faq
+    // A large-scale-change added 'default_applicable_licenses' to import
+    // all of the 'license_kinds' from "hardware_interfaces_license"
+    // to get the below license kinds:
+    //   SPDX-license-identifier-Apache-2.0
+    default_applicable_licenses: ["hardware_interfaces_license"],
+}
+
+aidl_interface {
+    name: "android.hardware.audio.common",
+    vendor_available: true,
+    srcs: [
+        "android/hardware/audio/common/PlaybackTrackMetadata.aidl",
+        "android/hardware/audio/common/RecordTrackMetadata.aidl",
+        "android/hardware/audio/common/SinkMetadata.aidl",
+        "android/hardware/audio/common/SourceMetadata.aidl",
+    ],
+    imports: [
+        "android.media.audio.common.types",
+    ],
+    stability: "vintf",
+    backend: {
+        cpp: {
+            enabled: true,
+        },
+        java: {
+            platform_apis: true,
+        },
+        ndk: {
+            vndk: {
+                enabled: true,
+            },
+        },
+    },
+    versions: [
+    ],
+}
diff --git a/audio/aidl/aidl_api/android.hardware.audio.common/current/android/hardware/audio/common/PlaybackTrackMetadata.aidl b/audio/aidl/aidl_api/android.hardware.audio.common/current/android/hardware/audio/common/PlaybackTrackMetadata.aidl
new file mode 100644
index 0000000..be4941c
--- /dev/null
+++ b/audio/aidl/aidl_api/android.hardware.audio.common/current/android/hardware/audio/common/PlaybackTrackMetadata.aidl
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2021 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.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file 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.audio.common;
+@JavaDerive(equals=true, toString=true) @VintfStability
+parcelable PlaybackTrackMetadata {
+  android.media.audio.common.AudioUsage usage = android.media.audio.common.AudioUsage.INVALID;
+  android.media.audio.common.AudioContentType contentType = android.media.audio.common.AudioContentType.UNKNOWN;
+  float gain;
+  android.media.audio.common.AudioChannelLayout channelMask;
+  @nullable android.media.audio.common.AudioDevice sourceDevice;
+  @utf8InCpp String[] tags;
+}
diff --git a/audio/aidl/aidl_api/android.hardware.audio.common/current/android/hardware/audio/common/RecordTrackMetadata.aidl b/audio/aidl/aidl_api/android.hardware.audio.common/current/android/hardware/audio/common/RecordTrackMetadata.aidl
new file mode 100644
index 0000000..8f667d1
--- /dev/null
+++ b/audio/aidl/aidl_api/android.hardware.audio.common/current/android/hardware/audio/common/RecordTrackMetadata.aidl
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2021 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.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file 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.audio.common;
+@JavaDerive(equals=true, toString=true) @VintfStability
+parcelable RecordTrackMetadata {
+  android.media.audio.common.AudioSource source = android.media.audio.common.AudioSource.SYS_RESERVED_INVALID;
+  float gain;
+  @nullable android.media.audio.common.AudioDevice destinationDevice;
+  android.media.audio.common.AudioChannelLayout channelMask;
+  @utf8InCpp String[] tags;
+}
diff --git a/audio/aidl/aidl_api/android.hardware.audio.common/current/android/hardware/audio/common/SinkMetadata.aidl b/audio/aidl/aidl_api/android.hardware.audio.common/current/android/hardware/audio/common/SinkMetadata.aidl
new file mode 100644
index 0000000..270147d
--- /dev/null
+++ b/audio/aidl/aidl_api/android.hardware.audio.common/current/android/hardware/audio/common/SinkMetadata.aidl
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2021 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.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file 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.audio.common;
+@JavaDerive(equals=true, toString=true) @VintfStability
+parcelable SinkMetadata {
+  android.hardware.audio.common.RecordTrackMetadata[] tracks;
+}
diff --git a/audio/aidl/aidl_api/android.hardware.audio.common/current/android/hardware/audio/common/SourceMetadata.aidl b/audio/aidl/aidl_api/android.hardware.audio.common/current/android/hardware/audio/common/SourceMetadata.aidl
new file mode 100644
index 0000000..2d4a982
--- /dev/null
+++ b/audio/aidl/aidl_api/android.hardware.audio.common/current/android/hardware/audio/common/SourceMetadata.aidl
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2021 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.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file 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.audio.common;
+@JavaDerive(equals=true, toString=true) @VintfStability
+parcelable SourceMetadata {
+  android.hardware.audio.common.PlaybackTrackMetadata[] tracks;
+}
diff --git a/audio/aidl/android/hardware/audio/common/PlaybackTrackMetadata.aidl b/audio/aidl/android/hardware/audio/common/PlaybackTrackMetadata.aidl
new file mode 100644
index 0000000..9ce1e1f
--- /dev/null
+++ b/audio/aidl/android/hardware/audio/common/PlaybackTrackMetadata.aidl
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2021 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.audio.common;
+
+import android.media.audio.common.AudioChannelLayout;
+import android.media.audio.common.AudioContentType;
+import android.media.audio.common.AudioDevice;
+import android.media.audio.common.AudioUsage;
+
+/**
+ * Metadata of a playback track for an output stream.
+ */
+@JavaDerive(equals=true, toString=true)
+@VintfStability
+parcelable PlaybackTrackMetadata {
+    AudioUsage usage = AudioUsage.INVALID;
+    AudioContentType contentType = AudioContentType.UNKNOWN;
+    /**
+     * Non-negative linear gain (scaling) applied to track samples.
+     * 0 means muted, 1 is unity gain, 2 means double amplitude, etc.
+     */
+    float gain;
+    AudioChannelLayout channelMask;
+    /**
+     * Indicates the source of an output stream, can be left unspecified.
+     */
+    @nullable AudioDevice sourceDevice;
+    /**
+     * Tags from AudioTrack audio attributes. Tag is an additional use case
+     * qualifier complementing AudioUsage and AudioContentType. Tags are set by
+     * vendor specific applications and must be prefixed by "VX_". Vendor must
+     * namespace their tag names to avoid conflicts, for example:
+     * "VX_GOOGLE_VR". At least 3 characters are required for the vendor
+     * namespace.
+     */
+    @utf8InCpp String[] tags;
+}
diff --git a/audio/aidl/android/hardware/audio/common/RecordTrackMetadata.aidl b/audio/aidl/android/hardware/audio/common/RecordTrackMetadata.aidl
new file mode 100644
index 0000000..dfd88f1
--- /dev/null
+++ b/audio/aidl/android/hardware/audio/common/RecordTrackMetadata.aidl
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2021 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.audio.common;
+
+import android.media.audio.common.AudioChannelLayout;
+import android.media.audio.common.AudioContentType;
+import android.media.audio.common.AudioDevice;
+import android.media.audio.common.AudioSource;
+
+/**
+ * Metadata of a record track for an input stream.
+ */
+@JavaDerive(equals=true, toString=true)
+@VintfStability
+parcelable RecordTrackMetadata {
+    AudioSource source = AudioSource.SYS_RESERVED_INVALID;
+    /**
+     * Non-negative linear gain (scaling) applied to track samples.
+     * 0 means muted, 1 is unity gain, 2 means double amplitude, etc.
+     */
+    float gain;
+    /**
+     * Indicates the destination of an input stream, can be left unspecified.
+     */
+    @nullable AudioDevice destinationDevice;
+    AudioChannelLayout channelMask;
+    /**
+     * Tags from AudioRecord audio attributes. Tag is an additional use case
+     * qualifier complementing AudioUsage and AudioContentType. Tags are set by
+     * vendor specific applications and must be prefixed by "VX_". Vendor must
+     * namespace their tag names to avoid conflicts, for example:
+     * "VX_GOOGLE_VR". At least 3 characters are required for the vendor
+     * namespace.
+     */
+    @utf8InCpp String[] tags;
+}
diff --git a/audio/aidl/android/hardware/audio/common/SinkMetadata.aidl b/audio/aidl/android/hardware/audio/common/SinkMetadata.aidl
new file mode 100644
index 0000000..188c847
--- /dev/null
+++ b/audio/aidl/android/hardware/audio/common/SinkMetadata.aidl
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2021 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.audio.common;
+
+import android.hardware.audio.common.RecordTrackMetadata;
+
+/**
+ * Metadata of record tracks for an input stream.
+ */
+@JavaDerive(equals=true, toString=true)
+@VintfStability
+parcelable SinkMetadata {
+    RecordTrackMetadata[] tracks;
+}
diff --git a/audio/aidl/android/hardware/audio/common/SourceMetadata.aidl b/audio/aidl/android/hardware/audio/common/SourceMetadata.aidl
new file mode 100644
index 0000000..e9f23c6
--- /dev/null
+++ b/audio/aidl/android/hardware/audio/common/SourceMetadata.aidl
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2021 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.audio.common;
+
+import android.hardware.audio.common.PlaybackTrackMetadata;
+
+/**
+ * Metadata of playback tracks for an output stream.
+ */
+@JavaDerive(equals=true, toString=true)
+@VintfStability
+parcelable SourceMetadata {
+    PlaybackTrackMetadata[] tracks;
+}
diff --git a/compatibility_matrices/exclude/fcm_exclude.cpp b/compatibility_matrices/exclude/fcm_exclude.cpp
index 1def738..2aa4bb2 100644
--- a/compatibility_matrices/exclude/fcm_exclude.cpp
+++ b/compatibility_matrices/exclude/fcm_exclude.cpp
@@ -51,6 +51,7 @@
             "android.hardware.media.bufferpool@2.0",
             "android.hardware.radio.config@1.2",
             // AIDL
+            "android.hardware.audio.common",
             "android.hardware.biometrics.common",
             "android.hardware.common",
             "android.hardware.common.fmq",
diff --git a/contexthub/aidl/default/ContextHub.cpp b/contexthub/aidl/default/ContextHub.cpp
index 1b56608..1fbccc5 100644
--- a/contexthub/aidl/default/ContextHub.cpp
+++ b/contexthub/aidl/default/ContextHub.cpp
@@ -21,38 +21,50 @@
 namespace hardware {
 namespace contexthub {
 
-// TODO(b/194285834): Implement AIDL HAL
+::ndk::ScopedAStatus ContextHub::getContextHubs(std::vector<ContextHubInfo>* out_contextHubInfos) {
+    ContextHubInfo hub = {};
+    hub.name = "Mock Context Hub";
+    hub.vendor = "AOSP";
+    hub.toolchain = "n/a";
+    hub.id = kMockHubId;
+    hub.peakMips = 1;
+    hub.maxSupportedMessageLengthBytes = 4096;
+    hub.chrePlatformId = UINT64_C(0x476f6f6754000000);
+    hub.chreApiMajorVersion = 1;
+    hub.chreApiMinorVersion = 6;
 
-::ndk::ScopedAStatus ContextHub::getContextHubs(
-        std::vector<ContextHubInfo>* /* out_contextHubInfos */) {
+    out_contextHubInfos->push_back(hub);
+
     return ndk::ScopedAStatus::ok();
 }
 
+// We don't expose any nanoapps for the default impl, therefore all nanoapp-related APIs fail.
 ::ndk::ScopedAStatus ContextHub::loadNanoapp(int32_t /* in_contextHubId */,
                                              const NanoappBinary& /* in_appBinary */,
-                                             int32_t /* in_transactionId */,
-                                             bool* /* _aidl_return */) {
+                                             int32_t /* in_transactionId */, bool* _aidl_return) {
+    *_aidl_return = false;
     return ndk::ScopedAStatus::ok();
 }
 
 ::ndk::ScopedAStatus ContextHub::unloadNanoapp(int32_t /* in_contextHubId */,
                                                int64_t /* in_appId */,
-                                               int32_t /* in_transactionId */,
-                                               bool* /* _aidl_return */) {
+                                               int32_t /* in_transactionId */, bool* _aidl_return) {
+    *_aidl_return = false;
     return ndk::ScopedAStatus::ok();
 }
 
 ::ndk::ScopedAStatus ContextHub::disableNanoapp(int32_t /* in_contextHubId */,
                                                 int64_t /* in_appId */,
                                                 int32_t /* in_transactionId */,
-                                                bool* /* _aidl_return */) {
+                                                bool* _aidl_return) {
+    *_aidl_return = false;
     return ndk::ScopedAStatus::ok();
 }
 
 ::ndk::ScopedAStatus ContextHub::enableNanoapp(int32_t /* in_contextHubId */,
                                                int64_t /* in_appId */,
-                                               int32_t /* in_transactionId */,
-                                               bool* /* _aidl_return */) {
+                                               int32_t /* in_transactionId */, bool* _aidl_return) {
+    *_aidl_return = false;
     return ndk::ScopedAStatus::ok();
 }
 
@@ -60,20 +72,42 @@
     return ndk::ScopedAStatus::ok();
 }
 
-::ndk::ScopedAStatus ContextHub::queryNanoapps(int32_t /* in_contextHubId */,
-                                               bool* /* _aidl_return */) {
+::ndk::ScopedAStatus ContextHub::queryNanoapps(int32_t in_contextHubId, bool* _aidl_return) {
+    if (in_contextHubId == kMockHubId && mCallback != nullptr) {
+        std::vector<NanoappInfo> nanoapps;
+        mCallback->handleNanoappInfo(nanoapps);
+        *_aidl_return = true;
+    } else {
+        *_aidl_return = false;
+    }
+
     return ndk::ScopedAStatus::ok();
 }
 
-::ndk::ScopedAStatus ContextHub::registerCallback(
-        int32_t /* in_contextHubId */, const std::shared_ptr<IContextHubCallback>& /* in_cb */,
-        bool* /* _aidl_return */) {
+::ndk::ScopedAStatus ContextHub::registerCallback(int32_t in_contextHubId,
+                                                  const std::shared_ptr<IContextHubCallback>& in_cb,
+                                                  bool* _aidl_return) {
+    if (in_contextHubId == kMockHubId) {
+        mCallback = in_cb;
+        *_aidl_return = true;
+    } else {
+        *_aidl_return = false;
+    }
     return ndk::ScopedAStatus::ok();
 }
 
-::ndk::ScopedAStatus ContextHub::sendMessageToHub(int32_t /* in_contextHubId */,
+::ndk::ScopedAStatus ContextHub::sendMessageToHub(int32_t in_contextHubId,
                                                   const ContextHubMessage& /* in_message */,
-                                                  bool* /* _aidl_return */) {
+                                                  bool* _aidl_return) {
+    if (in_contextHubId == kMockHubId) {
+        // Return true here to indicate that the HAL has accepted the message.
+        // Successful delivery of the message to a nanoapp should be handled at
+        // a higher level protocol.
+        *_aidl_return = true;
+    } else {
+        *_aidl_return = false;
+    }
+
     return ndk::ScopedAStatus::ok();
 }
 
diff --git a/contexthub/aidl/default/include/contexthub-impl/ContextHub.h b/contexthub/aidl/default/include/contexthub-impl/ContextHub.h
index 980cee5..0dbb61b 100644
--- a/contexthub/aidl/default/include/contexthub-impl/ContextHub.h
+++ b/contexthub/aidl/default/include/contexthub-impl/ContextHub.h
@@ -41,6 +41,10 @@
     ::ndk::ScopedAStatus sendMessageToHub(int32_t in_contextHubId,
                                           const ContextHubMessage& in_message,
                                           bool* _aidl_return) override;
+
+  private:
+    static constexpr uint32_t kMockHubId = 0;
+    std::shared_ptr<IContextHubCallback> mCallback;
 };
 
 }  // namespace contexthub
diff --git a/contexthub/aidl/vts/VtsAidlHalContextHubTargetTest.cpp b/contexthub/aidl/vts/VtsAidlHalContextHubTargetTest.cpp
index 3601f13..2b91b97 100644
--- a/contexthub/aidl/vts/VtsAidlHalContextHubTargetTest.cpp
+++ b/contexthub/aidl/vts/VtsAidlHalContextHubTargetTest.cpp
@@ -74,8 +74,8 @@
         EXPECT_GT(hub.peakMips, 0);
         EXPECT_GT(hub.chrePlatformId, 0);
         EXPECT_GT(hub.chreApiMajorVersion, 0);
-        EXPECT_GT(hub.chreApiMinorVersion, 0);
-        EXPECT_GT(hub.chrePatchVersion, 0);
+        EXPECT_GE(hub.chreApiMinorVersion, 0);
+        EXPECT_GE(hub.chrePatchVersion, 0);
 
         // Minimum 128 byte MTU as required by CHRE API v1.0
         EXPECT_GE(hub.maxSupportedMessageLengthBytes, UINT32_C(128));
diff --git a/security/keymint/aidl/vts/functional/VtsRemotelyProvisionedComponentTests.cpp b/security/keymint/aidl/vts/functional/VtsRemotelyProvisionedComponentTests.cpp
index 38f3586..76fb79b 100644
--- a/security/keymint/aidl/vts/functional/VtsRemotelyProvisionedComponentTests.cpp
+++ b/security/keymint/aidl/vts/functional/VtsRemotelyProvisionedComponentTests.cpp
@@ -222,7 +222,7 @@
     // Generate an ECDSA key that is attested by the generated P256 keypair.
     AuthorizationSet keyDesc = AuthorizationSetBuilder()
                                        .Authorization(TAG_NO_AUTH_REQUIRED)
-                                       .EcdsaSigningKey(256)
+                                       .EcdsaSigningKey(EcCurve::P_256)
                                        .AttestationChallenge("foo")
                                        .AttestationApplicationId("bar")
                                        .Digest(Digest::NONE)
diff --git a/security/keymint/support/authorization_set.cpp b/security/keymint/support/authorization_set.cpp
index 25eace3..c1b5d48 100644
--- a/security/keymint/support/authorization_set.cpp
+++ b/security/keymint/support/authorization_set.cpp
@@ -161,11 +161,6 @@
     return EncryptionKey();
 }
 
-AuthorizationSetBuilder& AuthorizationSetBuilder::EcdsaSigningKey(uint32_t key_size) {
-    EcdsaKey(key_size);
-    return SigningKey();
-}
-
 AuthorizationSetBuilder& AuthorizationSetBuilder::EcdsaSigningKey(EcCurve curve) {
     EcdsaKey(curve);
     return SigningKey();
diff --git a/security/keymint/support/include/keymint_support/authorization_set.h b/security/keymint/support/include/keymint_support/authorization_set.h
index ca51b08..e41a329 100644
--- a/security/keymint/support/include/keymint_support/authorization_set.h
+++ b/security/keymint/support/include/keymint_support/authorization_set.h
@@ -281,7 +281,6 @@
 
     AuthorizationSetBuilder& RsaSigningKey(uint32_t key_size, uint64_t public_exponent);
     AuthorizationSetBuilder& RsaEncryptionKey(uint32_t key_size, uint64_t public_exponent);
-    AuthorizationSetBuilder& EcdsaSigningKey(uint32_t key_size);
     AuthorizationSetBuilder& EcdsaSigningKey(EcCurve curve);
     AuthorizationSetBuilder& AesEncryptionKey(uint32_t key_size);
     AuthorizationSetBuilder& TripleDesEncryptionKey(uint32_t key_size);