diff --git a/services/soundtrigger/SoundTriggerHalHidl.h b/services/soundtrigger/SoundTriggerHalHidl.h
new file mode 100644
index 0000000..9b0d7a7
--- /dev/null
+++ b/services/soundtrigger/SoundTriggerHalHidl.h
@@ -0,0 +1,167 @@
+/*
+ * 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_HAL_HIDL_H
+#define ANDROID_HARDWARE_SOUNDTRIGGER_HAL_HIDL_H
+
+#include <utils/RefBase.h>
+#include <utils/KeyedVector.h>
+#include <utils/Vector.h>
+#include <utils/threads.h>
+#include "SoundTriggerHalInterface.h"
+#include <android/hardware/soundtrigger/2.0/types.h>
+#include <android/hardware/soundtrigger/2.0/ISoundTriggerHw.h>
+#include <android/hardware/soundtrigger/2.0/ISoundTriggerHwCallback.h>
+#include <android/hardware/soundtrigger/2.0/BnSoundTriggerHwCallback.h>
+
+namespace android {
+
+using android::hardware::audio::common::V2_0::Uuid;
+using android::hardware::soundtrigger::V2_0::ConfidenceLevel;
+using android::hardware::soundtrigger::V2_0::PhraseRecognitionExtra;
+using android::hardware::soundtrigger::V2_0::SoundModelType;
+using android::hardware::soundtrigger::V2_0::SoundModelHandle;
+using android::hardware::soundtrigger::V2_0::ISoundTriggerHw;
+using android::hardware::soundtrigger::V2_0::ISoundTriggerHwCallback;
+
+class SoundTriggerHalHidl : public SoundTriggerHalInterface,
+                            public virtual ISoundTriggerHwCallback
+
+{
+public:
+        virtual int getProperties(struct sound_trigger_properties *properties);
+
+        /*
+         * Load a sound model. Once loaded, recognition of this model can be started and stopped.
+         * Only one active recognition per model at a time. The SoundTrigger service will handle
+         * concurrent recognition requests by different users/applications on the same model.
+         * The implementation returns a unique handle used by other functions (unload_sound_model(),
+         * start_recognition(), etc...
+         */
+        virtual int loadSoundModel(struct sound_trigger_sound_model *sound_model,
+                                sound_model_callback_t callback,
+                                void *cookie,
+                                sound_model_handle_t *handle);
+
+        /*
+         * Unload a sound model. A sound model can be unloaded to make room for a new one to overcome
+         * implementation limitations.
+         */
+        virtual int unloadSoundModel(sound_model_handle_t handle);
+
+        /* Start recognition on a given model. Only one recognition active at a time per model.
+         * Once recognition succeeds of fails, the callback is called.
+         * TODO: group recognition configuration parameters into one struct and add key phrase options.
+         */
+        virtual int startRecognition(sound_model_handle_t handle,
+                                 const struct sound_trigger_recognition_config *config,
+                                 recognition_callback_t callback,
+                                 void *cookie);
+
+        /* Stop recognition on a given model.
+         * The implementation does not have to call the callback when stopped via this method.
+         */
+        virtual int stopRecognition(sound_model_handle_t handle);
+
+        /* Stop recognition on all models.
+         * Only supported for device api versions SOUND_TRIGGER_DEVICE_API_VERSION_1_1 or above.
+         * If no implementation is provided, stop_recognition will be called for each running model.
+         */
+        virtual int stopAllRecognitions();
+
+        // RefBase
+        virtual     void        onFirstRef();
+
+        // ISoundTriggerHwCallback
+        virtual ::android::hardware::Return<void> recognitionCallback(
+                const ISoundTriggerHwCallback::RecognitionEvent& event, CallbackCookie cookie);
+        virtual ::android::hardware::Return<void> phraseRecognitionCallback(
+                const ISoundTriggerHwCallback::PhraseRecognitionEvent& event, int32_t cookie);
+        virtual ::android::hardware::Return<void> soundModelCallback(
+                const ISoundTriggerHwCallback::ModelEvent& event, CallbackCookie cookie);
+private:
+        class SoundModel : public RefBase {
+        public:
+            SoundModel(sound_model_handle_t handle, sound_model_callback_t callback,
+                       void *cookie, android::hardware::soundtrigger::V2_0::SoundModelHandle halHandle)
+                 : mHandle(handle), mHalHandle(halHandle),
+                   mSoundModelCallback(callback), mSoundModelCookie(cookie),
+                   mRecognitionCallback(NULL), mRecognitionCookie(NULL) {}
+            ~SoundModel() {}
+
+            sound_model_handle_t   mHandle;
+            android::hardware::soundtrigger::V2_0::SoundModelHandle mHalHandle;
+            sound_model_callback_t mSoundModelCallback;
+            void *                 mSoundModelCookie;
+            recognition_callback_t mRecognitionCallback;
+            void *                 mRecognitionCookie;
+        };
+
+        friend class SoundTriggerHalInterface;
+
+        explicit SoundTriggerHalHidl(const char *moduleName = NULL);
+        virtual  ~SoundTriggerHalHidl();
+
+        void convertUuidToHal(Uuid *halUuid,
+                              const struct sound_trigger_uuid_s *uuid);
+        void convertUuidFromHal(struct sound_trigger_uuid_s *uuid,
+                                const Uuid *halUuid);
+
+        void convertPropertiesFromHal(
+                struct sound_trigger_properties *properties,
+                const ISoundTriggerHw::Properties *halProperties);
+
+        void convertTriggerPhraseToHal(
+                ISoundTriggerHw::Phrase *halTriggerPhrase,
+                const struct sound_trigger_phrase *triggerPhrase);
+        ISoundTriggerHw::SoundModel *convertSoundModelToHal(
+                const struct sound_trigger_sound_model *soundModel);
+
+        void convertPhraseRecognitionExtraToHal(
+                PhraseRecognitionExtra *halExtra,
+                const struct sound_trigger_phrase_recognition_extra *extra);
+        ISoundTriggerHw::RecognitionConfig *convertRecognitionConfigToHal(
+                const struct sound_trigger_recognition_config *config);
+
+        struct sound_trigger_model_event *convertSoundModelEventFromHal(
+                                              const ISoundTriggerHwCallback::ModelEvent *halEvent);
+        void convertPhraseRecognitionExtraFromHal(
+                struct sound_trigger_phrase_recognition_extra *extra,
+                const PhraseRecognitionExtra *halExtra);
+        struct sound_trigger_recognition_event *convertRecognitionEventFromHal(
+                const ISoundTriggerHwCallback::RecognitionEvent *halEvent);
+
+        uint32_t nextUniqueId();
+        sp<ISoundTriggerHw> getService();
+        void clearService();
+        sp<SoundModel> getModel(sound_model_handle_t handle);
+        sp<SoundModel> removeModel(sound_model_handle_t handle);
+
+        static pthread_once_t sOnceControl;
+        static void sOnceInit();
+
+        Mutex mLock;
+        Mutex mHalLock;
+        const char *mModuleName;
+        volatile atomic_uint_fast32_t  mNextUniqueId;
+        // Effect chains without a valid thread
+        DefaultKeyedVector< sound_model_handle_t , sp<SoundModel> > mSoundModels;
+        sp<::android::hardware::soundtrigger::V2_0::ISoundTriggerHw> mISoundTrigger;
+};
+
+} // namespace android
+
+#endif // ANDROID_HARDWARE_SOUNDTRIGGER_HAL_HIDL_H