diff --git a/audio/common/2.0/default/Android.mk b/audio/common/2.0/default/Android.mk
new file mode 100644
index 0000000..aa60eb2
--- /dev/null
+++ b/audio/common/2.0/default/Android.mk
@@ -0,0 +1,29 @@
+#
+# Copyright (C) 2016 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.
+
+
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+LOCAL_MODULE := android.hardware.audio.common@2.0-util
+LOCAL_SRC_FILES := \
+    EffectMap.cpp \
+
+LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)
+
+LOCAL_SHARED_LIBRARIES := \
+    libutils \
+
+include $(BUILD_SHARED_LIBRARY)
diff --git a/audio/common/2.0/default/EffectMap.cpp b/audio/common/2.0/default/EffectMap.cpp
new file mode 100644
index 0000000..703b91c
--- /dev/null
+++ b/audio/common/2.0/default/EffectMap.cpp
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2016 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 <atomic>
+
+#include "EffectMap.h"
+
+namespace android {
+
+ANDROID_SINGLETON_STATIC_INSTANCE(EffectMap);
+
+// static
+const uint64_t EffectMap::INVALID_ID = 0;
+
+// static
+uint64_t EffectMap::makeUniqueId() {
+    static std::atomic<uint64_t> counter{INVALID_ID + 1};
+    return counter++;
+}
+
+uint64_t EffectMap::add(effect_handle_t handle) {
+    uint64_t newId = makeUniqueId();
+    std::lock_guard<std::mutex> lock(mLock);
+    mEffects.add(newId, handle);
+    return newId;
+}
+
+effect_handle_t EffectMap::get(const uint64_t& id) {
+    std::lock_guard<std::mutex> lock(mLock);
+    ssize_t idx = mEffects.indexOfKey(id);
+    return idx >= 0 ? mEffects[idx] : NULL;
+}
+
+void EffectMap::remove(effect_handle_t handle) {
+    std::lock_guard<std::mutex> lock(mLock);
+    for (size_t i = 0; i < mEffects.size(); ++i) {
+        if (mEffects[i] == handle) {
+            mEffects.removeItemsAt(i);
+            break;
+        }
+    }
+}
+
+}  // namespace android
diff --git a/audio/common/2.0/default/EffectMap.h b/audio/common/2.0/default/EffectMap.h
new file mode 100644
index 0000000..82bbb1f
--- /dev/null
+++ b/audio/common/2.0/default/EffectMap.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2016 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_audio_V2_0_EffectMap_H_
+#define android_hardware_audio_V2_0_EffectMap_H_
+
+#include <mutex>
+
+#include <hardware/audio_effect.h>
+#include <utils/KeyedVector.h>
+#include <utils/Singleton.h>
+
+namespace android {
+
+// This class needs to be in 'android' ns because Singleton macros require that.
+class EffectMap : public Singleton<EffectMap> {
+  public:
+    static const uint64_t INVALID_ID;
+
+    uint64_t add(effect_handle_t handle);
+    effect_handle_t get(const uint64_t& id);
+    void remove(effect_handle_t handle);
+
+  private:
+    static uint64_t makeUniqueId();
+
+    std::mutex mLock;
+    KeyedVector<uint64_t, effect_handle_t> mEffects;
+};
+
+}  // namespace android
+
+#endif  // android_hardware_audio_V2_0_EffectMap_H_
diff --git a/audio/common/2.0/types.hal b/audio/common/2.0/types.hal
index a5ec68d..75fdb52 100644
--- a/audio/common/2.0/types.hal
+++ b/audio/common/2.0/types.hal
@@ -555,8 +555,7 @@
     IN_IP                    = BIT_IN | 0x80000,
     /* audio bus implemented by the audio system (e.g an MOST stereo channel) */
     IN_BUS                   = BIT_IN | 0x100000,
-    IN_DEFAULT               = BIT_IN |
-                                            BIT_DEFAULT,
+    IN_DEFAULT               = BIT_IN | BIT_DEFAULT,
 
     IN_ALL     = (IN_COMMUNICATION |
             IN_AMBIENT |
@@ -798,10 +797,10 @@
             union UseCase {
                 AudioStreamType stream;
                 AudioSource source;
-            };
+            } useCase;
         } mix;
         AudioPortConfigSessionExt session;
-    };
+    } ext;
 };
 
 /*
@@ -849,16 +848,5 @@
         AudioPortDeviceExt device;
         AudioPortMixExt mix;
         AudioPortSessionExt session;
-    };
-};
-
-/*
- * An audio patch represents a connection between one or more source ports and
- * one or more sink ports. Patches are connected and disconnected by audio
- * policy manager or by applications via framework APIs.
- */
-struct AudioPatch {
-    AudioPatchHandle id;
-    vec<AudioPortConfig> sources;
-    vec<AudioPortConfig> sinks;
+    } ext;
 };