diff --git a/soundtrigger/2.0/default/Android.mk b/soundtrigger/2.0/default/Android.mk
new file mode 100644
index 0000000..4ec64de
--- /dev/null
+++ b/soundtrigger/2.0/default/Android.mk
@@ -0,0 +1,42 @@
+#
+# 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.soundtrigger@2.0-impl
+LOCAL_MODULE_RELATIVE_PATH := hw
+LOCAL_SRC_FILES := \
+    SoundTriggerHalImpl.cpp
+
+LOCAL_SHARED_LIBRARIES := \
+        libhidl \
+        liblog \
+        libhwbinder \
+        libutils \
+        libhardware \
+        android.hardware.soundtrigger@2.0 \
+        android.hardware.audio.common@2.0
+
+LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)
+
+ifeq ($(strip $(AUDIOSERVER_MULTILIB)),)
+LOCAL_MULTILIB := 32
+else
+LOCAL_MULTILIB := $(AUDIOSERVER_MULTILIB)
+endif
+
+include $(BUILD_SHARED_LIBRARY)
diff --git a/soundtrigger/2.0/default/SoundTriggerHalImpl.cpp b/soundtrigger/2.0/default/SoundTriggerHalImpl.cpp
new file mode 100644
index 0000000..1ae996a
--- /dev/null
+++ b/soundtrigger/2.0/default/SoundTriggerHalImpl.cpp
@@ -0,0 +1,595 @@
+/*
+ * 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.
+ */
+
+#define LOG_TAG "SoundTriggerHalImpl"
+//#define LOG_NDEBUG 0
+
+#include <utils/Log.h>
+#include "SoundTriggerHalImpl.h"
+
+
+namespace android {
+namespace hardware {
+namespace soundtrigger {
+namespace V2_0 {
+namespace implementation {
+
+// static
+void SoundTriggerHalImpl::soundModelCallback(struct sound_trigger_model_event *halEvent,
+                                               void *cookie)
+{
+    if (halEvent == NULL) {
+        ALOGW("soundModelCallback called with NULL event");
+        return;
+    }
+    sp<SoundModelClient> client =
+            wp<SoundModelClient>(static_cast<SoundModelClient *>(cookie)).promote();
+    if (client == 0) {
+        ALOGW("soundModelCallback called on stale client");
+        return;
+    }
+    if (halEvent->model != client->mHalHandle) {
+        ALOGW("soundModelCallback call with wrong handle %d on client with handle %d",
+              (int)halEvent->model, (int)client->mHalHandle);
+        return;
+    }
+
+    ISoundTriggerHwCallback::ModelEvent event;
+    convertSoundModelEventFromHal(&event, halEvent);
+    event.model = client->mId;
+
+    client->mCallback->soundModelCallback(event, client->mCookie);
+}
+
+// static
+void SoundTriggerHalImpl::recognitionCallback(struct sound_trigger_recognition_event *halEvent,
+                                               void *cookie)
+{
+    if (halEvent == NULL) {
+        ALOGW("recognitionCallback call NULL event");
+        return;
+    }
+    sp<SoundModelClient> client =
+            wp<SoundModelClient>(static_cast<SoundModelClient *>(cookie)).promote();
+    if (client == 0) {
+        ALOGW("soundModelCallback called on stale client");
+        return;
+    }
+
+    ISoundTriggerHwCallback::RecognitionEvent *event = convertRecognitionEventFromHal(halEvent);
+    event->model = client->mId;
+    if (halEvent->type == SOUND_MODEL_TYPE_KEYPHRASE) {
+        client->mCallback->phraseRecognitionCallback(
+                *(reinterpret_cast<ISoundTriggerHwCallback::PhraseRecognitionEvent *>(event)),
+                client->mCookie);
+    } else {
+        client->mCallback->recognitionCallback(*event, client->mCookie);
+    }
+    delete event;
+}
+
+
+
+// Methods from ::android::hardware::soundtrigger::V2_0::ISoundTriggerHw follow.
+Return<void> SoundTriggerHalImpl::getProperties(getProperties_cb _hidl_cb)
+{
+    ALOGV("getProperties() mHwDevice %p", mHwDevice);
+    int ret;
+    struct sound_trigger_properties halProperties;
+    ISoundTriggerHw::Properties properties;
+
+    if (mHwDevice == NULL) {
+        ret = -ENODEV;
+        goto exit;
+    }
+
+    ret = mHwDevice->get_properties(mHwDevice, &halProperties);
+
+    convertPropertiesFromHal(&properties, &halProperties);
+
+    ALOGV("getProperties implementor %s recognitionModes %08x",
+          properties.implementor.c_str(), properties.recognitionModes);
+
+exit:
+    _hidl_cb(ret, properties);
+    return Void();
+}
+
+int SoundTriggerHalImpl::doLoadSoundModel(const ISoundTriggerHw::SoundModel& soundModel,
+                                                 const sp<ISoundTriggerHwCallback>& callback,
+                                                 ISoundTriggerHwCallback::CallbackCookie cookie,
+                                                 uint32_t *modelId)
+{
+    int32_t ret = 0;
+    struct sound_trigger_sound_model *halSoundModel;
+    *modelId = 0;
+    sp<SoundModelClient> client;
+
+    ALOGV("doLoadSoundModel() data size %zu", soundModel.data.size());
+
+    if (mHwDevice == NULL) {
+        ret = -ENODEV;
+        goto exit;
+    }
+
+    halSoundModel = convertSoundModelToHal(&soundModel);
+    if (halSoundModel == NULL) {
+        ret = -EINVAL;
+        goto exit;
+    }
+
+    {
+        AutoMutex lock(mLock);
+        do {
+            *modelId = nextUniqueId();
+        } while (mClients.valueFor(*modelId) != 0 && *modelId != 0);
+    }
+    LOG_ALWAYS_FATAL_IF(*modelId == 0,
+                        "wrap around in sound model IDs, num loaded models %d", mClients.size());
+
+    client = new SoundModelClient(*modelId, callback, cookie);
+
+    ret = mHwDevice->load_sound_model(mHwDevice, halSoundModel, soundModelCallback,
+                                          client.get(), &client->mHalHandle);
+
+    free(halSoundModel);
+
+    if (ret != 0) {
+        goto exit;
+    }
+
+    {
+        AutoMutex lock(mLock);
+        mClients.add(*modelId, client);
+    }
+
+exit:
+    return ret;
+}
+
+Return<void> SoundTriggerHalImpl::loadSoundModel(const ISoundTriggerHw::SoundModel& soundModel,
+                                                 const sp<ISoundTriggerHwCallback>& callback,
+                                                 ISoundTriggerHwCallback::CallbackCookie cookie,
+                                                 loadSoundModel_cb _hidl_cb)
+{
+    uint32_t modelId = 0;
+    int32_t ret = doLoadSoundModel(soundModel, callback, cookie, &modelId);
+
+    _hidl_cb(ret, modelId);
+    return Void();
+}
+
+Return<void> SoundTriggerHalImpl::loadPhraseSoundModel(
+                                            const ISoundTriggerHw::PhraseSoundModel& soundModel,
+                                            const sp<ISoundTriggerHwCallback>& callback,
+                                            ISoundTriggerHwCallback::CallbackCookie cookie,
+                                            ISoundTriggerHw::loadPhraseSoundModel_cb _hidl_cb)
+{
+    uint32_t modelId = 0;
+    int32_t ret = doLoadSoundModel((const ISoundTriggerHw::SoundModel&)soundModel,
+                                   callback, cookie, &modelId);
+
+    _hidl_cb(ret, modelId);
+    return Void();
+}
+
+Return<int32_t> SoundTriggerHalImpl::unloadSoundModel(SoundModelHandle modelHandle)
+{
+    int32_t ret;
+    sp<SoundModelClient> client;
+
+    if (mHwDevice == NULL) {
+        ret = -ENODEV;
+        goto exit;
+    }
+
+    {
+        AutoMutex lock(mLock);
+        client = mClients.valueFor(modelHandle);
+        if (client == 0) {
+            ret = -ENOSYS;
+            goto exit;
+        }
+    }
+
+    ret = mHwDevice->unload_sound_model(mHwDevice, client->mHalHandle);
+
+    mClients.removeItem(modelHandle);
+
+exit:
+    return ret;
+}
+
+Return<int32_t> SoundTriggerHalImpl::startRecognition(SoundModelHandle modelHandle,
+                                           const ISoundTriggerHw::RecognitionConfig& config,
+                                           const sp<ISoundTriggerHwCallback>& callback __unused,
+                                           ISoundTriggerHwCallback::CallbackCookie cookie __unused)
+{
+    int32_t ret;
+    sp<SoundModelClient> client;
+    struct sound_trigger_recognition_config *halConfig;
+
+    if (mHwDevice == NULL) {
+        ret = -ENODEV;
+        goto exit;
+    }
+
+    {
+        AutoMutex lock(mLock);
+        client = mClients.valueFor(modelHandle);
+        if (client == 0) {
+            ret = -ENOSYS;
+            goto exit;
+        }
+    }
+
+
+    halConfig = convertRecognitionConfigToHal(&config);
+
+    if (halConfig == NULL) {
+        ret = -EINVAL;
+        goto exit;
+    }
+    ret = mHwDevice->start_recognition(mHwDevice, client->mHalHandle, halConfig,
+                                 recognitionCallback, client.get());
+
+    free(halConfig);
+
+exit:
+    return ret;
+}
+
+Return<int32_t> SoundTriggerHalImpl::stopRecognition(SoundModelHandle modelHandle)
+{
+    int32_t ret;
+    sp<SoundModelClient> client;
+    if (mHwDevice == NULL) {
+        ret = -ENODEV;
+        goto exit;
+    }
+
+    {
+        AutoMutex lock(mLock);
+        client = mClients.valueFor(modelHandle);
+        if (client == 0) {
+            ret = -ENOSYS;
+            goto exit;
+        }
+    }
+
+    ret = mHwDevice->stop_recognition(mHwDevice, client->mHalHandle);
+
+exit:
+    return ret;
+}
+
+Return<int32_t> SoundTriggerHalImpl::stopAllRecognitions()
+{
+    int32_t ret;
+    if (mHwDevice == NULL) {
+        ret = -ENODEV;
+        goto exit;
+    }
+
+    if (mHwDevice->common.version >= SOUND_TRIGGER_DEVICE_API_VERSION_1_1 &&
+            mHwDevice->stop_all_recognitions) {
+        ret = mHwDevice->stop_all_recognitions(mHwDevice);
+    } else {
+        ret = -ENOSYS;
+    }
+exit:
+    return ret;
+}
+
+SoundTriggerHalImpl::SoundTriggerHalImpl(const char *moduleName)
+    : mModuleName(moduleName), mNextModelId(1)
+{
+}
+
+void SoundTriggerHalImpl::onFirstRef()
+{
+    const hw_module_t *mod;
+    int rc;
+
+    if (mModuleName == NULL || strlen(mModuleName) == 0) {
+        mModuleName = "primary";
+    }
+    rc = hw_get_module_by_class(SOUND_TRIGGER_HARDWARE_MODULE_ID, mModuleName, &mod);
+    if (rc != 0) {
+        ALOGE("couldn't load sound trigger module %s.%s (%s)",
+              SOUND_TRIGGER_HARDWARE_MODULE_ID, mModuleName, strerror(-rc));
+        return;
+    }
+    rc = sound_trigger_hw_device_open(mod, &mHwDevice);
+    if (rc != 0) {
+        ALOGE("couldn't open sound trigger hw device in %s.%s (%s)",
+              SOUND_TRIGGER_HARDWARE_MODULE_ID, mModuleName, strerror(-rc));
+        mHwDevice = NULL;
+        return;
+    }
+    if (mHwDevice->common.version < SOUND_TRIGGER_DEVICE_API_VERSION_1_0 ||
+            mHwDevice->common.version > SOUND_TRIGGER_DEVICE_API_VERSION_CURRENT) {
+        ALOGE("wrong sound trigger hw device version %04x", mHwDevice->common.version);
+        sound_trigger_hw_device_close(mHwDevice);
+        mHwDevice = NULL;
+        return;
+    }
+
+    ALOGI("onFirstRef() mModuleName %s mHwDevice %p", mModuleName, mHwDevice);
+}
+
+SoundTriggerHalImpl::~SoundTriggerHalImpl()
+{
+    if (mHwDevice != NULL) {
+        sound_trigger_hw_device_close(mHwDevice);
+    }
+}
+
+uint32_t SoundTriggerHalImpl::nextUniqueId()
+{
+    return (uint32_t) atomic_fetch_add_explicit(&mNextModelId,
+                (uint_fast32_t) 1, memory_order_acq_rel);
+}
+
+void SoundTriggerHalImpl::convertUuidFromHal(Uuid *uuid,
+                                             const sound_trigger_uuid_t *halUuid)
+{
+    uuid->timeLow = halUuid->timeLow;
+    uuid->timeMid = halUuid->timeMid;
+    uuid->versionAndTimeHigh = halUuid->timeHiAndVersion;
+    uuid->variantAndClockSeqHigh = halUuid->clockSeq;
+    memcpy(&uuid->node[0], &halUuid->node[0], 6);
+}
+
+void SoundTriggerHalImpl::convertUuidToHal(sound_trigger_uuid_t *halUuid,
+                                           const Uuid *uuid)
+{
+    halUuid->timeLow = uuid->timeLow;
+    halUuid->timeMid = uuid->timeMid;
+    halUuid->timeHiAndVersion = uuid->versionAndTimeHigh;
+    halUuid->clockSeq = uuid->variantAndClockSeqHigh;
+    memcpy(&halUuid->node[0], &uuid->node[0], 6);
+}
+
+void SoundTriggerHalImpl::convertPropertiesFromHal(
+        ISoundTriggerHw::Properties *properties,
+        const struct sound_trigger_properties *halProperties)
+{
+    properties->implementor = halProperties->implementor;
+    properties->description = halProperties->description;
+    properties->version = halProperties->version;
+    convertUuidFromHal(&properties->uuid, &halProperties->uuid);
+    properties->maxSoundModels = halProperties->max_sound_models;
+    properties->maxKeyPhrases = halProperties->max_key_phrases;
+    properties->maxUsers = halProperties->max_users;
+    properties->recognitionModes = halProperties->recognition_modes;
+    properties->captureTransition = halProperties->capture_transition;
+    properties->maxBufferMs = halProperties->max_buffer_ms;
+    properties->concurrentCapture = halProperties->concurrent_capture;
+    properties->triggerInEvent = halProperties->trigger_in_event;
+    properties->powerConsumptionMw = halProperties->power_consumption_mw;
+
+}
+
+void SoundTriggerHalImpl::convertTriggerPhraseToHal(
+        struct sound_trigger_phrase *halTriggerPhrase,
+        const ISoundTriggerHw::Phrase *triggerPhrase)
+{
+    halTriggerPhrase->id = triggerPhrase->id;
+    halTriggerPhrase->recognition_mode = triggerPhrase->recognitionModes;
+    unsigned int i;
+    for (i = 0; i < triggerPhrase->users.size(); i++) {
+        halTriggerPhrase->users[i] = triggerPhrase->users[i];
+    }
+    halTriggerPhrase->num_users = i;
+
+    strlcpy(halTriggerPhrase->locale,
+            triggerPhrase->locale.c_str(), SOUND_TRIGGER_MAX_LOCALE_LEN);
+    strlcpy(halTriggerPhrase->text,
+            triggerPhrase->text.c_str(), SOUND_TRIGGER_MAX_STRING_LEN);
+}
+
+struct sound_trigger_sound_model *SoundTriggerHalImpl::convertSoundModelToHal(
+        const ISoundTriggerHw::SoundModel *soundModel)
+{
+    struct sound_trigger_sound_model *halModel = NULL;
+    if (soundModel->type == SoundModelType::KEYPHRASE) {
+        size_t allocSize =
+                sizeof(struct sound_trigger_phrase_sound_model) + soundModel->data.size();
+        struct sound_trigger_phrase_sound_model *halKeyPhraseModel =
+                static_cast<struct sound_trigger_phrase_sound_model *>(malloc(allocSize));
+        LOG_ALWAYS_FATAL_IF(halKeyPhraseModel == NULL,
+                        "malloc failed for size %zu in convertSoundModelToHal PHRASE", allocSize);
+
+        const ISoundTriggerHw::PhraseSoundModel *keyPhraseModel =
+                reinterpret_cast<const ISoundTriggerHw::PhraseSoundModel *>(soundModel);
+
+        size_t i;
+        for (i = 0; i < keyPhraseModel->phrases.size() && i < SOUND_TRIGGER_MAX_PHRASES; i++) {
+            convertTriggerPhraseToHal(&halKeyPhraseModel->phrases[i],
+                                      &keyPhraseModel->phrases[i]);
+        }
+        halKeyPhraseModel->num_phrases = (unsigned int)i;
+        halModel = reinterpret_cast<struct sound_trigger_sound_model *>(halKeyPhraseModel);
+        halModel->data_offset = sizeof(struct sound_trigger_phrase_sound_model);
+    } else {
+        size_t allocSize =
+                sizeof(struct sound_trigger_sound_model) + soundModel->data.size();
+        halModel = static_cast<struct sound_trigger_sound_model *>(malloc(allocSize));
+        LOG_ALWAYS_FATAL_IF(halModel == NULL,
+                            "malloc failed for size %zu in convertSoundModelToHal GENERIC",
+                            allocSize);
+
+        halModel->data_offset = sizeof(struct sound_trigger_sound_model);
+    }
+    halModel->type = (sound_trigger_sound_model_type_t)soundModel->type;
+    convertUuidToHal(&halModel->uuid, &soundModel->uuid);
+    convertUuidToHal(&halModel->vendor_uuid, &soundModel->vendorUuid);
+    halModel->data_size = soundModel->data.size();
+    uint8_t *dst = reinterpret_cast<uint8_t *>(halModel) + halModel->data_offset;
+    const uint8_t *src = reinterpret_cast<const uint8_t *>(&soundModel->data[0]);
+    memcpy(dst, src, soundModel->data.size());
+
+    return halModel;
+}
+
+void SoundTriggerHalImpl::convertPhraseRecognitionExtraToHal(
+        struct sound_trigger_phrase_recognition_extra *halExtra,
+        const PhraseRecognitionExtra *extra)
+{
+    halExtra->id = extra->id;
+    halExtra->recognition_modes = extra->recognitionModes;
+    halExtra->confidence_level = extra->confidenceLevel;
+
+    unsigned int i;
+    for (i = 0; i < extra->levels.size() && i < SOUND_TRIGGER_MAX_USERS; i++) {
+        halExtra->levels[i].user_id = extra->levels[i].userId;
+        halExtra->levels[i].level = extra->levels[i].levelPercent;
+    }
+    halExtra->num_levels = i;
+}
+
+struct sound_trigger_recognition_config *SoundTriggerHalImpl::convertRecognitionConfigToHal(
+        const ISoundTriggerHw::RecognitionConfig *config)
+{
+    size_t allocSize = sizeof(struct sound_trigger_recognition_config) + config->data.size();
+    struct sound_trigger_recognition_config *halConfig =
+            static_cast<struct sound_trigger_recognition_config *>(malloc(allocSize));
+
+    LOG_ALWAYS_FATAL_IF(halConfig == NULL,
+                        "malloc failed for size %zu in convertRecognitionConfigToHal",
+                        allocSize);
+
+    halConfig->capture_handle = (audio_io_handle_t)config->captureHandle;
+    halConfig->capture_device = (audio_devices_t)config->captureDevice;
+    halConfig->capture_requested = config->captureRequested;
+
+    unsigned int i;
+    for (i = 0; i < config->phrases.size() && i < SOUND_TRIGGER_MAX_PHRASES; i++) {
+        convertPhraseRecognitionExtraToHal(&halConfig->phrases[i],
+                                  &config->phrases[i]);
+    }
+    halConfig->num_phrases = i;
+
+    halConfig->data_offset = sizeof(struct sound_trigger_recognition_config);
+    halConfig->data_size = config->data.size();
+    uint8_t *dst = reinterpret_cast<uint8_t *>(halConfig) + halConfig->data_offset;
+    const uint8_t *src = reinterpret_cast<const uint8_t *>(&config->data[0]);
+    memcpy(dst, src, config->data.size());
+    return halConfig;
+}
+
+// static
+void SoundTriggerHalImpl::convertSoundModelEventFromHal(ISoundTriggerHwCallback::ModelEvent *event,
+                                                const struct sound_trigger_model_event *halEvent)
+{
+    event->status = (ISoundTriggerHwCallback::SoundModelStatus)halEvent->status;
+    // event->model to be remapped by called
+    event->data.setToExternal(
+            const_cast<uint8_t *>(reinterpret_cast<const uint8_t *>(halEvent)) + halEvent->data_offset,
+            halEvent->data_size);
+}
+
+// static
+ISoundTriggerHwCallback::RecognitionEvent *SoundTriggerHalImpl::convertRecognitionEventFromHal(
+                                            const struct sound_trigger_recognition_event *halEvent)
+{
+    ISoundTriggerHwCallback::RecognitionEvent * event;
+
+    if (halEvent->type == SOUND_MODEL_TYPE_KEYPHRASE) {
+        const struct sound_trigger_phrase_recognition_event *halPhraseEvent =
+                reinterpret_cast<const struct sound_trigger_phrase_recognition_event *>(halEvent);
+        ISoundTriggerHwCallback::PhraseRecognitionEvent *phraseEvent =
+                new ISoundTriggerHwCallback::PhraseRecognitionEvent();
+
+        PhraseRecognitionExtra *phraseExtras =
+                new PhraseRecognitionExtra[halPhraseEvent->num_phrases];
+        for (unsigned int i = 0; i < halPhraseEvent->num_phrases; i++) {
+            convertPhraseRecognitionExtraFromHal(&phraseExtras[i],
+                                                 &halPhraseEvent->phrase_extras[i]);
+        }
+        phraseEvent->phraseExtras.setToExternal(phraseExtras, halPhraseEvent->num_phrases);
+        // FIXME: transfer buffer ownership. should have a method for that in hidl_vec
+        phraseEvent->phraseExtras.resize(halPhraseEvent->num_phrases);
+        delete[] phraseExtras;
+        event = reinterpret_cast<ISoundTriggerHwCallback::RecognitionEvent *>(phraseEvent);
+    } else {
+        event = new ISoundTriggerHwCallback::RecognitionEvent();
+    }
+
+    event->status = static_cast<ISoundTriggerHwCallback::RecognitionStatus>(halEvent->status);
+    event->type = static_cast<SoundModelType>(halEvent->type);
+    // event->model to be remapped by called
+    event->captureAvailable = halEvent->capture_available;
+    event->captureSession = halEvent->capture_session;
+    event->captureDelayMs = halEvent->capture_delay_ms;
+    event->capturePreambleMs = halEvent->capture_preamble_ms;
+    event->triggerInData = halEvent->trigger_in_data;
+    event->audioConfig.sampleRateHz = halEvent->audio_config.sample_rate;
+    event->audioConfig.channelMask =
+            (audio::common::V2_0::AudioChannelMask)halEvent->audio_config.channel_mask;
+    event->audioConfig.format = (audio::common::V2_0::AudioFormat)halEvent->audio_config.format;
+    event->data.setToExternal(
+            const_cast<uint8_t *>(reinterpret_cast<const uint8_t *>(halEvent)) + halEvent->data_offset,
+            halEvent->data_size);
+
+    return event;
+}
+
+// static
+void SoundTriggerHalImpl::convertPhraseRecognitionExtraFromHal(
+        PhraseRecognitionExtra *extra,
+        const struct sound_trigger_phrase_recognition_extra *halExtra)
+{
+    extra->id = halExtra->id;
+    extra->recognitionModes = halExtra->recognition_modes;
+    extra->confidenceLevel = halExtra->confidence_level;
+
+    ConfidenceLevel *levels =
+            new ConfidenceLevel[halExtra->num_levels];
+    for (unsigned int i = 0; i < halExtra->num_levels; i++) {
+        levels[i].userId = halExtra->levels[i].user_id;
+        levels[i].levelPercent = halExtra->levels[i].level;
+    }
+    extra->levels.setToExternal(levels, halExtra->num_levels);
+    // FIXME: transfer buffer ownership. should have a method for that in hidl_vec
+    extra->levels.resize(halExtra->num_levels);
+    delete[] levels;
+}
+
+ISoundTriggerHw *HIDL_FETCH_ISoundTriggerHw(const char *name)
+{
+    if (name != NULL) {
+        if (strncmp(SOUND_TRIGGER_HARDWARE_MODULE_ID, name,
+                strlen(SOUND_TRIGGER_HARDWARE_MODULE_ID)) != 0) {
+            return NULL;
+        }
+        name = strchr(name, '.');
+        if (name == NULL) {
+            return NULL;
+        }
+        name++;
+    }
+    return new SoundTriggerHalImpl(name);
+}
+} // namespace implementation
+}  // namespace V2_0
+}  // namespace soundtrigger
+}  // namespace hardware
+}  // namespace android
+
+
+
diff --git a/soundtrigger/2.0/default/SoundTriggerHalImpl.h b/soundtrigger/2.0/default/SoundTriggerHalImpl.h
new file mode 100644
index 0000000..4e0d01d
--- /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
+