diff --git a/soundtrigger/2.0/default/SoundTriggerHalImpl.h b/soundtrigger/2.0/default/SoundTriggerHalImpl.h
new file mode 100644
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--- /dev/null
+++ b/soundtrigger/2.0/default/SoundTriggerHalImpl.h
@@ -0,0 +1,134 @@
+/*
+ * 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_SOUNDTRIGGER_V2_0_IMPLEMENTATION_H
+#define ANDROID_HARDWARE_SOUNDTRIGGER_V2_0_IMPLEMENTATION_H
+
+#include <android/hardware/soundtrigger/2.0/ISoundTriggerHw.h>
+#include <android/hardware/soundtrigger/2.0/ISoundTriggerHwCallback.h>
+#include <hidl/Status.h>
+#include <utils/threads.h>
+#include <utils/KeyedVector.h>
+#include <system/sound_trigger.h>
+#include <hardware/sound_trigger.h>
+
+namespace android {
+namespace hardware {
+namespace soundtrigger {
+namespace V2_0 {
+namespace implementation {
+
+using ::android::hardware::audio::common::V2_0::Uuid;
+using ::android::hardware::soundtrigger::V2_0::ISoundTriggerHwCallback;
+
+
+class SoundTriggerHalImpl : public ISoundTriggerHw {
+public:
+        explicit SoundTriggerHalImpl(const char *moduleName = NULL);
+
+        // Methods from ::android::hardware::soundtrigger::V2_0::ISoundTriggerHw follow.
+        Return<void> getProperties(getProperties_cb _hidl_cb)  override;
+        Return<void> loadSoundModel(const ISoundTriggerHw::SoundModel& soundModel,
+                                    const sp<ISoundTriggerHwCallback>& callback,
+                                    ISoundTriggerHwCallback::CallbackCookie cookie,
+                                    loadSoundModel_cb _hidl_cb)  override;
+        Return<void> loadPhraseSoundModel(const ISoundTriggerHw::PhraseSoundModel& soundModel,
+                                    const sp<ISoundTriggerHwCallback>& callback,
+                                    ISoundTriggerHwCallback::CallbackCookie cookie,
+                                    loadPhraseSoundModel_cb _hidl_cb)  override;
+
+        Return<int32_t> unloadSoundModel(SoundModelHandle modelHandle)  override;
+        Return<int32_t> startRecognition(SoundModelHandle modelHandle,
+                                      const ISoundTriggerHw::RecognitionConfig& config,
+                                      const sp<ISoundTriggerHwCallback>& callback,
+                                      ISoundTriggerHwCallback::CallbackCookie cookie)  override;
+        Return<int32_t> stopRecognition(SoundModelHandle modelHandle)  override;
+        Return<int32_t> stopAllRecognitions()  override;
+
+        // RefBase
+        virtual     void        onFirstRef();
+
+        static void soundModelCallback(struct sound_trigger_model_event *halEvent,
+                                       void *cookie);
+        static void recognitionCallback(struct sound_trigger_recognition_event *halEvent,
+                                        void *cookie);
+
+private:
+
+        class SoundModelClient : public RefBase {
+        public:
+            SoundModelClient(uint32_t id, sp<ISoundTriggerHwCallback> callback,
+                             ISoundTriggerHwCallback::CallbackCookie cookie)
+                : mId(id), mCallback(callback), mCookie(cookie) {}
+            virtual ~SoundModelClient() {}
+
+            uint32_t mId;
+            sound_model_handle_t mHalHandle;
+            sp<ISoundTriggerHwCallback> mCallback;
+            ISoundTriggerHwCallback::CallbackCookie mCookie;
+        };
+
+        uint32_t nextUniqueId();
+        void convertUuidFromHal(Uuid *uuid,
+                                const sound_trigger_uuid_t *halUuid);
+        void convertUuidToHal(sound_trigger_uuid_t *halUuid,
+                              const Uuid *uuid);
+        void convertPropertiesFromHal(ISoundTriggerHw::Properties *properties,
+                                      const struct sound_trigger_properties *halProperties);
+        void convertTriggerPhraseToHal(struct sound_trigger_phrase *halTriggerPhrase,
+                                       const ISoundTriggerHw::Phrase *triggerPhrase);
+        // returned HAL sound model must be freed by caller
+        struct sound_trigger_sound_model *convertSoundModelToHal(
+                    const ISoundTriggerHw::SoundModel *soundModel);
+        void convertPhraseRecognitionExtraToHal(
+                struct sound_trigger_phrase_recognition_extra *halExtra,
+                const PhraseRecognitionExtra *extra);
+        // returned recognition config must be freed by caller
+        struct sound_trigger_recognition_config *convertRecognitionConfigToHal(
+                const ISoundTriggerHw::RecognitionConfig *config);
+
+
+        static void convertSoundModelEventFromHal(ISoundTriggerHwCallback::ModelEvent *event,
+                                            const struct sound_trigger_model_event *halEvent);
+        static ISoundTriggerHwCallback::RecognitionEvent *convertRecognitionEventFromHal(
+                                            const struct sound_trigger_recognition_event *halEvent);
+        static void convertPhraseRecognitionExtraFromHal(PhraseRecognitionExtra *extra,
+                                    const struct sound_trigger_phrase_recognition_extra *halExtra);
+
+        int doLoadSoundModel(const ISoundTriggerHw::SoundModel& soundModel,
+                             const sp<ISoundTriggerHwCallback>& callback,
+                             ISoundTriggerHwCallback::CallbackCookie cookie,
+                             uint32_t *modelId);
+
+        virtual             ~SoundTriggerHalImpl();
+
+        const char *                                        mModuleName;
+        struct sound_trigger_hw_device*                     mHwDevice;
+        volatile atomic_uint_fast32_t                       mNextModelId;
+        DefaultKeyedVector<int32_t, sp<SoundModelClient> >  mClients;
+        Mutex                                               mLock;
+};
+
+extern "C" ISoundTriggerHw *HIDL_FETCH_ISoundTriggerHw(const char *name);
+
+}  // namespace implementation
+}  // namespace V2_0
+}  // namespace soundtrigger
+}  // namespace hardware
+}  // namespace android
+
+#endif  // ANDROID_HARDWARE_SOUNDTRIGGER_V2_0_IMPLEMENTATION_H
+