diff --git a/services/soundtrigger/SoundTriggerHalLegacy.cpp b/services/soundtrigger/SoundTriggerHalLegacy.cpp
new file mode 100644
index 0000000..2b78818
--- /dev/null
+++ b/services/soundtrigger/SoundTriggerHalLegacy.cpp
@@ -0,0 +1,127 @@
+/*
+ * 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 <utils/Log.h>
+#include "SoundTriggerHalLegacy.h"
+
+namespace android {
+
+/* static */
+sp<SoundTriggerHalInterface> SoundTriggerHalInterface::connectModule(const char *moduleName)
+{
+    return new SoundTriggerHalLegacy(moduleName);
+}
+
+SoundTriggerHalLegacy::SoundTriggerHalLegacy(const char *moduleName)
+    : mModuleName(moduleName), mHwDevice(NULL)
+{
+}
+
+void SoundTriggerHalLegacy::onFirstRef()
+{
+    const hw_module_t *mod;
+    int rc;
+
+    if (mModuleName == NULL) {
+        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);
+        return;
+    }
+}
+
+SoundTriggerHalLegacy::~SoundTriggerHalLegacy()
+{
+    if (mHwDevice != NULL) {
+        sound_trigger_hw_device_close(mHwDevice);
+    }
+}
+
+int SoundTriggerHalLegacy::getProperties(struct sound_trigger_properties *properties)
+{
+    if (mHwDevice == NULL) {
+        return -ENODEV;
+    }
+    return mHwDevice->get_properties(mHwDevice, properties);
+}
+
+int SoundTriggerHalLegacy::loadSoundModel(struct sound_trigger_sound_model *sound_model,
+                        sound_model_callback_t callback,
+                        void *cookie,
+                        sound_model_handle_t *handle)
+{
+    if (mHwDevice == NULL) {
+        return -ENODEV;
+    }
+    return mHwDevice->load_sound_model(mHwDevice, sound_model, callback, cookie, handle);
+}
+
+int SoundTriggerHalLegacy::unloadSoundModel(sound_model_handle_t handle)
+{
+    if (mHwDevice == NULL) {
+        return -ENODEV;
+    }
+    return mHwDevice->unload_sound_model(mHwDevice, handle);
+}
+
+int SoundTriggerHalLegacy::startRecognition(sound_model_handle_t handle,
+                         const struct sound_trigger_recognition_config *config,
+                         recognition_callback_t callback,
+                         void *cookie)
+{
+    if (mHwDevice == NULL) {
+        return -ENODEV;
+    }
+    return mHwDevice->start_recognition(mHwDevice, handle, config, callback, cookie);
+}
+
+int SoundTriggerHalLegacy::stopRecognition(sound_model_handle_t handle)
+{
+    if (mHwDevice == NULL) {
+        return -ENODEV;
+    }
+    return mHwDevice->stop_recognition(mHwDevice, handle);
+}
+
+int SoundTriggerHalLegacy::stopAllRecognitions()
+{
+    if (mHwDevice == NULL) {
+        return -ENODEV;
+    }
+    if (mHwDevice->common.version >= SOUND_TRIGGER_DEVICE_API_VERSION_1_1 &&
+     mHwDevice->stop_all_recognitions) {
+        return mHwDevice->stop_all_recognitions(mHwDevice);
+    }
+    return -ENOSYS;
+}
+
+} // namespace android