diff --git a/hal/Android.mk b/hal/Android.mk
index 910edbe..30abdf3 100644
--- a/hal/Android.mk
+++ b/hal/Android.mk
@@ -20,6 +20,7 @@
 
 LOCAL_SRC_FILES := \
 	audio_hw.c \
+	voice.c \
 	$(AUDIO_PLATFORM)/platform.c
 
 LOCAL_SHARED_LIBRARIES := \
@@ -36,13 +37,19 @@
 	$(call include-path-for, audio-route) \
 	$(call include-path-for, audio-effects) \
 	$(LOCAL_PATH)/$(AUDIO_PLATFORM) \
-	$(LOCAL_PATH)/audio_extn
+	$(LOCAL_PATH)/audio_extn \
+	$(LOCAL_PATH)/voice_extn
 
 ifneq ($(filter msm8084,$(TARGET_BOARD_PLATFORM)),)
   LOCAL_SHARED_LIBRARIES += libmdmdetect
   LOCAL_C_INCLUDES += $(TARGET_OUT_HEADERS)/libmdmdetect/inc
 endif
 
+ifeq ($(strip $(AUDIO_FEATURE_ENABLED_MULTI_VOICE_SESSIONS)),true)
+    LOCAL_CFLAGS += -DMULTI_VOICE_SESSION_ENABLED
+    LOCAL_SRC_FILES += voice_extn/voice_extn.c
+endif
+
 ifeq ($(strip $(AUDIO_FEATURE_ENABLED_HFP)),true)
     LOCAL_CFLAGS += -DHFP_ENABLED
     LOCAL_SRC_FILES += audio_extn/hfp.c
diff --git a/hal/audio_extn/hfp.c b/hal/audio_extn/hfp.c
index aa5d209..a108730 100644
--- a/hal/audio_extn/hfp.c
+++ b/hal/audio_extn/hfp.c
@@ -144,8 +144,8 @@
               __func__, pcm_dev_rx_id, pcm_dev_tx_id, uc_info->id);
 
     ALOGV("%s: Opening PCM playback device card_id(%d) device_id(%d)",
-          __func__, SOUND_CARD, pcm_dev_rx_id);
-    hfpmod.hfp_sco_rx = pcm_open(SOUND_CARD,
+          __func__, adev->snd_card, pcm_dev_rx_id);
+    hfpmod.hfp_sco_rx = pcm_open(adev->snd_card,
                                   pcm_dev_asm_rx_id,
                                   PCM_OUT, &pcm_config_hfp);
     if (hfpmod.hfp_sco_rx && !pcm_is_ready(hfpmod.hfp_sco_rx)) {
@@ -154,8 +154,8 @@
         goto exit;
     }
     ALOGD("%s: Opening PCM capture device card_id(%d) device_id(%d)",
-          __func__, SOUND_CARD, pcm_dev_tx_id);
-    hfpmod.hfp_pcm_rx = pcm_open(SOUND_CARD,
+          __func__, adev->snd_card, pcm_dev_tx_id);
+    hfpmod.hfp_pcm_rx = pcm_open(adev->snd_card,
                                    pcm_dev_rx_id,
                                    PCM_OUT, &pcm_config_hfp);
     if (hfpmod.hfp_pcm_rx && !pcm_is_ready(hfpmod.hfp_pcm_rx)) {
@@ -163,7 +163,7 @@
         ret = -EIO;
         goto exit;
     }
-    hfpmod.hfp_sco_tx = pcm_open(SOUND_CARD,
+    hfpmod.hfp_sco_tx = pcm_open(adev->snd_card,
                                   pcm_dev_asm_tx_id,
                                   PCM_IN, &pcm_config_hfp);
     if (hfpmod.hfp_sco_tx && !pcm_is_ready(hfpmod.hfp_sco_tx)) {
@@ -172,8 +172,8 @@
         goto exit;
     }
     ALOGV("%s: Opening PCM capture device card_id(%d) device_id(%d)",
-          __func__, SOUND_CARD, pcm_dev_tx_id);
-    hfpmod.hfp_pcm_tx = pcm_open(SOUND_CARD,
+          __func__, adev->snd_card, pcm_dev_tx_id);
+    hfpmod.hfp_pcm_tx = pcm_open(adev->snd_card,
                                    pcm_dev_tx_id,
                                    PCM_IN, &pcm_config_hfp);
     if (hfpmod.hfp_pcm_tx && !pcm_is_ready(hfpmod.hfp_pcm_tx)) {
diff --git a/hal/audio_hw.c b/hal/audio_hw.c
index b8fe400..55555f5 100644
--- a/hal/audio_hw.c
+++ b/hal/audio_hw.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 The Android Open Source Project
+ * Copyright (C) 2013-2014 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.
@@ -48,6 +48,7 @@
 #include "audio_extn.h"
 #include "platform_api.h"
 #include <platform.h>
+#include "voice_extn.h"
 
 #include "sound/compress_params.h"
 
@@ -104,24 +105,23 @@
     .format = PCM_FORMAT_S16_LE,
 };
 
-struct pcm_config pcm_config_voice_call = {
-    .channels = 1,
-    .rate = 8000,
-    .period_size = 160,
-    .period_count = 2,
-    .format = PCM_FORMAT_S16_LE,
-};
-
-static const char * const use_case_table[AUDIO_USECASE_MAX] = {
+const char * const use_case_table[AUDIO_USECASE_MAX] = {
     [USECASE_AUDIO_PLAYBACK_DEEP_BUFFER] = "deep-buffer-playback",
     [USECASE_AUDIO_PLAYBACK_LOW_LATENCY] = "low-latency-playback",
     [USECASE_AUDIO_PLAYBACK_MULTI_CH] = "multi-channel-playback",
+    [USECASE_AUDIO_PLAYBACK_OFFLOAD] = "compress-offload-playback",
+
     [USECASE_AUDIO_RECORD] = "audio-record",
     [USECASE_AUDIO_RECORD_LOW_LATENCY] = "low-latency-record",
+
     [USECASE_AUDIO_HFP_SCO] = "hfp-sco",
     [USECASE_AUDIO_HFP_SCO_WB] = "hfp-sco-wb",
+
     [USECASE_VOICE_CALL] = "voice-call",
-    [USECASE_AUDIO_PLAYBACK_OFFLOAD] = "compress-offload-playback",
+    [USECASE_VOICE2_CALL] = "voice2-call",
+    [USECASE_VOLTE_CALL] = "volte-call",
+    [USECASE_QCHAT_CALL] = "qchat-call",
+    [USECASE_VOWLAN_CALL] = "vowlan-call",
 };
 
 
@@ -167,6 +167,19 @@
     return id;
 }
 
+int pcm_ioctl(void *pcm, int request, ...)
+{
+    va_list ap;
+    void * arg;
+    int pcm_fd = *(int*)pcm;
+
+    va_start(ap, request);
+    arg = va_arg(ap, void *);
+    va_end(ap);
+
+    return ioctl(pcm_fd, request, arg);
+}
+
 int enable_audio_route(struct audio_device *adev,
                        struct audio_usecase *usecase)
 {
@@ -216,7 +229,7 @@
 }
 
 int enable_snd_device(struct audio_device *adev,
-                             snd_device_t snd_device)
+                      snd_device_t snd_device)
 {
     if (snd_device < SND_DEVICE_MIN ||
         snd_device >= SND_DEVICE_MAX) {
@@ -244,7 +257,7 @@
 }
 
 int disable_snd_device(struct audio_device *adev,
-                              snd_device_t snd_device)
+                       snd_device_t snd_device)
 {
     if (snd_device < SND_DEVICE_MIN ||
         snd_device >= SND_DEVICE_MAX) {
@@ -373,6 +386,12 @@
             usecase = node_to_item(node, struct audio_usecase, list);
             if (switch_device[usecase->id]) {
                 disable_snd_device(adev, usecase->in_snd_device);
+            }
+        }
+
+        list_for_each(node, &adev->usecase_list) {
+            usecase = node_to_item(node, struct audio_usecase, list);
+            if (switch_device[usecase->id]) {
                 enable_snd_device(adev, snd_device);
             }
         }
@@ -390,7 +409,6 @@
     }
 }
 
-
 /* must be called with hw device mutex locked */
 static int read_hdmi_channel_masks(struct stream_out *out)
 {
@@ -465,9 +483,10 @@
          * usecase. This is to avoid switching devices for voice call when
          * check_usecases_codec_backend() is called below.
          */
-        if (adev->in_call) {
+        if (voice_is_in_call(adev)) {
             vc_usecase = get_usecase_from_list(adev, USECASE_VOICE_CALL);
-            if (vc_usecase->devices & AUDIO_DEVICE_OUT_ALL_CODEC_BACKEND) {
+            if ((vc_usecase->devices & AUDIO_DEVICE_OUT_ALL_CODEC_BACKEND) ||
+                (usecase->devices == AUDIO_DEVICE_IN_VOICE_CALL)) {
                 in_snd_device = vc_usecase->in_snd_device;
                 out_snd_device = vc_usecase->out_snd_device;
             }
@@ -638,8 +657,8 @@
     select_devices(adev, in->usecase);
 
     ALOGV("%s: Opening PCM device card_id(%d) device_id(%d), channels %d",
-          __func__, SOUND_CARD, in->pcm_device_id, in->config.channels);
-    in->pcm = pcm_open(SOUND_CARD, in->pcm_device_id,
+          __func__, adev->snd_card, in->pcm_device_id, in->config.channels);
+    in->pcm = pcm_open(adev->snd_card, in->pcm_device_id,
                            PCM_IN, &in->config);
     if (in->pcm && !pcm_is_ready(in->pcm)) {
         ALOGE("%s: %s", __func__, pcm_get_error(in->pcm));
@@ -946,9 +965,9 @@
     select_devices(adev, out->usecase);
 
     ALOGV("%s: Opening PCM device card_id(%d) device_id(%d) format(%#x)",
-          __func__, SOUND_CARD, out->pcm_device_id, out->config.format);
+          __func__, adev->snd_card, out->pcm_device_id, out->config.format);
     if (out->usecase != USECASE_AUDIO_PLAYBACK_OFFLOAD) {
-        out->pcm = pcm_open(SOUND_CARD, out->pcm_device_id,
+        out->pcm = pcm_open(adev->snd_card, out->pcm_device_id,
                                PCM_OUT | PCM_MONOTONIC, &out->config);
         if (out->pcm && !pcm_is_ready(out->pcm)) {
             ALOGE("%s: %s", __func__, pcm_get_error(out->pcm));
@@ -959,7 +978,7 @@
         }
     } else {
         out->pcm = NULL;
-        out->compr = compress_open(SOUND_CARD, out->pcm_device_id,
+        out->compr = compress_open(adev->snd_card, out->pcm_device_id,
                                    COMPRESS_IN, &out->compr_config);
         if (out->compr && !is_compress_ready(out->compr)) {
             ALOGE("%s: %s", __func__, compress_get_error(out->compr));
@@ -982,120 +1001,6 @@
     return ret;
 }
 
-static int stop_voice_call(struct audio_device *adev)
-{
-    int i, ret = 0;
-    struct audio_usecase *uc_info;
-
-    ALOGV("%s: enter", __func__);
-    adev->in_call = false;
-
-    ret = platform_stop_voice_call(adev->platform);
-
-    /* 1. Close the PCM devices */
-    if (adev->voice_call_rx) {
-        pcm_close(adev->voice_call_rx);
-        adev->voice_call_rx = NULL;
-    }
-    if (adev->voice_call_tx) {
-        pcm_close(adev->voice_call_tx);
-        adev->voice_call_tx = NULL;
-    }
-
-    uc_info = get_usecase_from_list(adev, USECASE_VOICE_CALL);
-    if (uc_info == NULL) {
-        ALOGE("%s: Could not find the usecase (%d) in the list",
-              __func__, USECASE_VOICE_CALL);
-        return -EINVAL;
-    }
-
-    /* 2. Get and set stream specific mixer controls */
-    disable_audio_route(adev, uc_info);
-
-    /* 3. Disable the rx and tx devices */
-    disable_snd_device(adev, uc_info->out_snd_device);
-    disable_snd_device(adev, uc_info->in_snd_device);
-
-    list_remove(&uc_info->list);
-    free(uc_info);
-
-    ALOGV("%s: exit: status(%d)", __func__, ret);
-    return ret;
-}
-
-static int start_voice_call(struct audio_device *adev)
-{
-    int i, ret = 0;
-    struct audio_usecase *uc_info;
-    int pcm_dev_rx_id, pcm_dev_tx_id;
-
-    ALOGV("%s: enter", __func__);
-
-    uc_info = (struct audio_usecase *)calloc(1, sizeof(struct audio_usecase));
-    uc_info->id = USECASE_VOICE_CALL;
-    uc_info->type = VOICE_CALL;
-    uc_info->stream.out = adev->primary_output;
-    uc_info->devices = adev->primary_output->devices;
-    uc_info->in_snd_device = SND_DEVICE_NONE;
-    uc_info->out_snd_device = SND_DEVICE_NONE;
-
-    list_add_tail(&adev->usecase_list, &uc_info->list);
-
-    select_devices(adev, USECASE_VOICE_CALL);
-
-    pcm_dev_rx_id = platform_get_pcm_device_id(uc_info->id, PCM_PLAYBACK);
-    pcm_dev_tx_id = platform_get_pcm_device_id(uc_info->id, PCM_CAPTURE);
-
-    if (pcm_dev_rx_id < 0 || pcm_dev_tx_id < 0) {
-        ALOGE("%s: Invalid PCM devices (rx: %d tx: %d) for the usecase(%d)",
-              __func__, pcm_dev_rx_id, pcm_dev_tx_id, uc_info->id);
-        ret = -EIO;
-        goto error_start_voice;
-    }
-
-    ALOGV("%s: Opening PCM playback device card_id(%d) device_id(%d)",
-          __func__, SOUND_CARD, pcm_dev_rx_id);
-    adev->voice_call_rx = pcm_open(SOUND_CARD,
-                                  pcm_dev_rx_id,
-                                  PCM_OUT | PCM_MONOTONIC, &pcm_config_voice_call);
-    if (adev->voice_call_rx && !pcm_is_ready(adev->voice_call_rx)) {
-        ALOGE("%s: %s", __func__, pcm_get_error(adev->voice_call_rx));
-        ret = -EIO;
-        goto error_start_voice;
-    }
-
-    ALOGV("%s: Opening PCM capture device card_id(%d) device_id(%d)",
-          __func__, SOUND_CARD, pcm_dev_tx_id);
-    adev->voice_call_tx = pcm_open(SOUND_CARD,
-                                   pcm_dev_tx_id,
-                                   PCM_IN, &pcm_config_voice_call);
-    if (adev->voice_call_tx && !pcm_is_ready(adev->voice_call_tx)) {
-        ALOGE("%s: %s", __func__, pcm_get_error(adev->voice_call_tx));
-        ret = -EIO;
-        goto error_start_voice;
-    }
-
-    /* set cached volume */
-    set_voice_volume_l(adev, adev->voice_volume);
-
-    pcm_start(adev->voice_call_rx);
-    pcm_start(adev->voice_call_tx);
-
-    ret = platform_start_voice_call(adev->platform);
-    if (ret < 0) {
-        ALOGE("%s: platform_start_voice_call error %d\n", __func__, ret);
-        goto error_start_voice;
-    }
-    adev->in_call = true;
-    return 0;
-
-error_start_voice:
-    stop_voice_call(adev);
-
-    ALOGD("%s: exit: status(%d)", __func__, ret);
-    return ret;
-}
-
 static int check_input_parameters(uint32_t sample_rate,
                                   audio_format_t format,
                                   int channel_count)
@@ -1320,18 +1225,21 @@
             if (!out->standby)
                 select_devices(adev, out->usecase);
 
-            if ((adev->mode == AUDIO_MODE_IN_CALL) && !adev->in_call &&
+            if ((adev->mode == AUDIO_MODE_IN_CALL) &&
+                    !voice_is_in_call(adev) &&
                     (out == adev->primary_output)) {
-                start_voice_call(adev);
-            } else if ((adev->mode == AUDIO_MODE_IN_CALL) && adev->in_call &&
-                       (out == adev->primary_output)) {
-                select_devices(adev, USECASE_VOICE_CALL);
+                ret = voice_start_call(adev);
+            } else if ((adev->mode == AUDIO_MODE_IN_CALL) &&
+                            voice_is_in_call(adev) &&
+                            (out == adev->primary_output)) {
+                voice_update_devices_for_all_voice_usecases(adev);
             }
         }
 
-        if ((adev->mode == AUDIO_MODE_NORMAL) && adev->in_call &&
+        if ((adev->mode == AUDIO_MODE_NORMAL) &&
+                voice_is_in_call(adev) &&
                 (out == adev->primary_output)) {
-            stop_voice_call(adev);
+            ret = voice_stop_call(adev);
         }
 
         pthread_mutex_unlock(&adev->lock);
@@ -1794,7 +1702,7 @@
      * Instead of writing zeroes here, we could trust the hardware
      * to always provide zeroes when muted.
      */
-    if (ret == 0 && adev->mic_mute)
+    if (ret == 0 && voice_get_mic_mute(adev) && !voice_is_in_call(adev))
         memset(buffer, 0, bytes);
 
 exit:
@@ -2074,32 +1982,14 @@
     int ret;
     int status = 0;
 
-    ALOGV("%s: enter: %s", __func__, kvpairs);
+    ALOGD("%s: enter: %s", __func__, kvpairs);
+
+    pthread_mutex_lock(&adev->lock);
 
     parms = str_parms_create_str(kvpairs);
-    ret = str_parms_get_str(parms, AUDIO_PARAMETER_KEY_TTY_MODE, value, sizeof(value));
-    if (ret >= 0) {
-        int tty_mode;
-
-        if (strcmp(value, AUDIO_PARAMETER_VALUE_TTY_OFF) == 0)
-            tty_mode = TTY_MODE_OFF;
-        else if (strcmp(value, AUDIO_PARAMETER_VALUE_TTY_VCO) == 0)
-            tty_mode = TTY_MODE_VCO;
-        else if (strcmp(value, AUDIO_PARAMETER_VALUE_TTY_HCO) == 0)
-            tty_mode = TTY_MODE_HCO;
-        else if (strcmp(value, AUDIO_PARAMETER_VALUE_TTY_FULL) == 0)
-            tty_mode = TTY_MODE_FULL;
-        else
-            return -EINVAL;
-
-        pthread_mutex_lock(&adev->lock);
-        if (tty_mode != adev->tty_mode) {
-            adev->tty_mode = tty_mode;
-            adev->acdb_settings = (adev->acdb_settings & TTY_MODE_CLEAR) | tty_mode;
-            if (adev->in_call)
-                select_devices(adev, USECASE_VOICE_CALL);
-        }
-        pthread_mutex_unlock(&adev->lock);
+    status = voice_set_parameters(adev, parms);
+    if (status != 0) {
+        goto done;
     }
 
     ret = str_parms_get_str(parms, AUDIO_PARAMETER_KEY_BT_NREC, value, sizeof(value));
@@ -2140,7 +2030,6 @@
             status = -EINVAL;
         }
         if (status == 0) {
-            pthread_mutex_lock(&adev->lock);
             if (adev->speaker_lr_swap != reverse_speakers) {
                 adev->speaker_lr_swap = reverse_speakers;
                 // only update the selected device if there is active pcm playback
@@ -2154,19 +2043,18 @@
                     }
                 }
             }
-            pthread_mutex_unlock(&adev->lock);
         }
     }
 
     ret = str_parms_get_str(parms, AUDIO_PARAMETER_KEY_BT_SCO_WB, value, sizeof(value));
     if (ret >= 0) {
-        pthread_mutex_lock(&adev->lock);
         adev->bt_wb_speech_enabled = !strcmp(value, AUDIO_PARAMETER_VALUE_ON);
-        pthread_mutex_unlock(&adev->lock);
     }
 
     audio_extn_hfp_set_parameters(adev, parms);
+done:
     str_parms_destroy(parms);
+    pthread_mutex_unlock(&adev->lock);
     ALOGV("%s: exit with code(%d)", __func__, status);
     return status;
 }
@@ -2174,7 +2062,21 @@
 static char* adev_get_parameters(const struct audio_hw_device *dev,
                                  const char *keys)
 {
-    return strdup("");
+    struct audio_device *adev = (struct audio_device *)dev;
+    struct str_parms *reply = str_parms_create();
+    struct str_parms *query = str_parms_create_str(keys);
+    char *str;
+
+    pthread_mutex_lock(&adev->lock);
+
+    voice_get_parameters(adev, query, reply);
+    str = str_parms_to_str(reply);
+    str_parms_destroy(query);
+    str_parms_destroy(reply);
+
+    pthread_mutex_unlock(&adev->lock);
+    ALOGV("%s: exit: returns - %s", __func__, str);
+    return str;
 }
 
 static int adev_init_check(const struct audio_hw_device *dev __unused)
@@ -2182,39 +2084,15 @@
     return 0;
 }
 
-/* always called with adev lock held */
-static int set_voice_volume_l(struct audio_device *adev, float volume)
-{
-    int vol, err = 0;
-
-    if (adev->mode == AUDIO_MODE_IN_CALL) {
-        if (volume < 0.0) {
-            volume = 0.0;
-        } else if (volume > 1.0) {
-            volume = 1.0;
-        }
-
-        vol = lrint(volume * 100.0);
-
-        // Voice volume levels from android are mapped to driver volume levels as follows.
-        // 0 -> 5, 20 -> 4, 40 ->3, 60 -> 2, 80 -> 1, 100 -> 0
-        // So adjust the volume to get the correct volume index in driver
-        vol = 100 - vol;
-
-        err = platform_set_voice_volume(adev->platform, vol);
-    }
-    return err;
-}
-
 static int adev_set_voice_volume(struct audio_hw_device *dev, float volume)
 {
     int ret;
     struct audio_device *adev = (struct audio_device *)dev;
+
     pthread_mutex_lock(&adev->lock);
-    /* cache volume */
-    adev->voice_volume = volume;
-    ret = set_voice_volume_l(adev, adev->voice_volume);
+    ret = voice_set_volume(adev, volume);
     pthread_mutex_unlock(&adev->lock);
+
     return ret;
 }
 
@@ -2245,6 +2123,7 @@
 
     pthread_mutex_lock(&adev->lock);
     if (adev->mode != mode) {
+        ALOGD("%s: mode %d\n", __func__, mode);
         adev->mode = mode;
     }
     pthread_mutex_unlock(&adev->lock);
@@ -2253,23 +2132,20 @@
 
 static int adev_set_mic_mute(struct audio_hw_device *dev, bool state)
 {
+    int ret;
     struct audio_device *adev = (struct audio_device *)dev;
-    int err = 0;
 
+    ALOGD("%s: state %d\n", __func__, state);
     pthread_mutex_lock(&adev->lock);
-    adev->mic_mute = state;
-
-    err = platform_set_mic_mute(adev->platform, state);
+    ret = voice_set_mic_mute(adev, state);
     pthread_mutex_unlock(&adev->lock);
-    return err;
+
+    return ret;
 }
 
 static int adev_get_mic_mute(const struct audio_hw_device *dev, bool *state)
 {
-    struct audio_device *adev = (struct audio_device *)dev;
-
-    *state = adev->mic_mute;
-
+    *state = voice_get_mic_mute((struct audio_device *)dev);
     return 0;
 }
 
@@ -2289,7 +2165,7 @@
 {
     struct audio_device *adev = (struct audio_device *)dev;
     struct stream_in *in;
-    int ret, buffer_size, frame_size;
+    int ret = 0, buffer_size, frame_size;
     int channel_count = popcount(config->channel_mask);
 
     ALOGV("%s: enter", __func__);
@@ -2299,6 +2175,8 @@
 
     in = (struct stream_in *)calloc(1, sizeof(struct stream_in));
 
+    pthread_mutex_init(&in->lock, (const pthread_mutexattr_t *) NULL);
+
     in->stream.common.get_sample_rate = in_get_sample_rate;
     in->stream.common.set_sample_rate = in_set_sample_rate;
     in->stream.common.get_buffer_size = in_get_buffer_size;
@@ -2415,7 +2293,7 @@
 
     size_t i;
     unsigned dir;
-    const unsigned card_id = SOUND_CARD;
+    const unsigned card_id = adev->snd_card;
     char info[512]; /* for possible debug info */
 
     for (dir = 0; dir < 2; ++dir) {
@@ -2539,6 +2417,8 @@
 
     adev = calloc(1, sizeof(struct audio_device));
 
+    pthread_mutex_init(&adev->lock, (const pthread_mutexattr_t *) NULL);
+
     adev->device.common.tag = HARDWARE_DEVICE_TAG;
     adev->device.common.version = AUDIO_DEVICE_API_VERSION_2_0;
     adev->device.common.module = (struct hw_module_t *)module;
@@ -2567,15 +2447,11 @@
     adev->mode = AUDIO_MODE_NORMAL;
     adev->active_input = NULL;
     adev->primary_output = NULL;
-    adev->voice_call_rx = NULL;
-    adev->voice_call_tx = NULL;
-    adev->voice_volume = 1.0f;
-    adev->tty_mode = TTY_MODE_OFF;
     adev->bluetooth_nrec = true;
-    adev->in_call = false;
     adev->acdb_settings = TTY_MODE_OFF;
     /* adev->cur_hdmi_channels = 0;  by calloc() */
     adev->snd_dev_ref_cnt = calloc(SND_DEVICE_MAX, sizeof(int));
+    voice_init(adev);
     list_init(&adev->usecase_list);
     pthread_mutex_unlock(&adev->lock);
 
diff --git a/hal/audio_hw.h b/hal/audio_hw.h
index 37805ab..62bc100 100644
--- a/hal/audio_hw.h
+++ b/hal/audio_hw.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 The Android Open Source Project
+ * Copyright (C) 2013-2014 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.
@@ -25,6 +25,7 @@
 #include <tinycompress/tinycompress.h>
 
 #include <audio_route/audio_route.h>
+#include "voice.h"
 
 #define VISUALIZER_LIBRARY_PATH "/system/lib/soundfx/libqcomvisualizer.so"
 
@@ -65,6 +66,15 @@
     USECASE_AUDIO_RECORD_LOW_LATENCY,
 
     USECASE_VOICE_CALL,
+
+    /* Voice extension usecases */
+    USECASE_VOICE2_CALL,
+    USECASE_VOLTE_CALL,
+    USECASE_QCHAT_CALL,
+    USECASE_VOWLAN_CALL,
+    USECASE_INCALL_REC_UPLINK,
+    USECASE_INCALL_REC_DOWNLINK,
+    USECASE_INCALL_REC_UPLINK_AND_DOWNLINK,
     AUDIO_USECASE_MAX
 } audio_usecase_t;
 
@@ -181,22 +191,18 @@
     audio_mode_t mode;
     struct stream_in *active_input;
     struct stream_out *primary_output;
-    int in_call;
-    float voice_volume;
-    bool mic_mute;
-    int tty_mode;
     bool bluetooth_nrec;
     bool screen_off;
-    struct pcm *voice_call_rx;
-    struct pcm *voice_call_tx;
     int *snd_dev_ref_cnt;
     struct listnode usecase_list;
     struct audio_route *audio_route;
     int acdb_settings;
     bool speaker_lr_swap;
+    struct voice voice;
     unsigned int cur_hdmi_channels;
     bool bt_wb_speech_enabled;
 
+    int snd_card;
     void *platform;
 
     void *visualizer_lib;
@@ -212,19 +218,31 @@
     struct pcm_params *use_case_table[AUDIO_USECASE_MAX];
 };
 
+int pcm_ioctl(void *pcm, int request, ...);
+
 int select_devices(struct audio_device *adev,
                    audio_usecase_t uc_id);
+
 int disable_audio_route(struct audio_device *adev,
                         struct audio_usecase *usecase);
+
 int disable_snd_device(struct audio_device *adev,
                        snd_device_t snd_device);
+
 int enable_snd_device(struct audio_device *adev,
                       snd_device_t snd_device);
+
 int enable_audio_route(struct audio_device *adev,
                        struct audio_usecase *usecase);
+
 struct audio_usecase *get_usecase_from_list(struct audio_device *adev,
                                             audio_usecase_t uc_id);
 
+#define LITERAL_TO_STRING(x) #x
+#define CHECK(condition) LOG_ALWAYS_FATAL_IF(!(condition), "%s",\
+            __FILE__ ":" LITERAL_TO_STRING(__LINE__)\
+            " ASSERT_FATAL(" #condition ") failed.")
+
 /*
  * NOTE: when multiple mutexes have to be acquired, always take the
  * stream_in or stream_out mutex first, followed by the audio_device mutex.
diff --git a/hal/msm8960/platform.c b/hal/msm8960/platform.c
index ae551b9..87b18b2 100644
--- a/hal/msm8960/platform.c
+++ b/hal/msm8960/platform.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 The Android Open Source Project
+ * Copyright (C) 2013-2014 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.
@@ -481,7 +481,7 @@
     return ret;
 }
 
-int platform_start_voice_call(void *platform)
+int platform_start_voice_call(void *platform, uint32_t vsid __unused)
 {
     struct platform_data *my_data = (struct platform_data *)platform;
     int ret = 0;
@@ -501,7 +501,7 @@
     return ret;
 }
 
-int platform_stop_voice_call(void *platform)
+int platform_stop_voice_call(void *platform, uint32_t vsid __unused)
 {
     struct platform_data *my_data = (struct platform_data *)platform;
     int ret = 0;
@@ -564,6 +564,12 @@
     return ret;
 }
 
+int platform_set_device_mute(void *platform __unused, bool state __unused, char *dir __unused)
+{
+    LOGE("%s: Not implemented", __func__);
+    return -ENOSYS;
+}
+
 snd_device_t platform_get_output_snd_device(void *platform, audio_devices_t devices)
 {
     struct platform_data *my_data = (struct platform_data *)platform;
@@ -680,10 +686,10 @@
             ALOGE("%s: No output device set for voice call", __func__);
             goto exit;
         }
-        if (adev->tty_mode != TTY_MODE_OFF) {
+        if (adev->voice.tty_mode != TTY_MODE_OFF) {
             if (out_device & AUDIO_DEVICE_OUT_WIRED_HEADPHONE ||
                 out_device & AUDIO_DEVICE_OUT_WIRED_HEADSET) {
-                switch (adev->tty_mode) {
+                switch (adev->voice.tty_mode) {
                 case TTY_MODE_FULL:
                     snd_device = SND_DEVICE_IN_VOICE_TTY_FULL_HEADSET_MIC;
                     break;
@@ -694,7 +700,7 @@
                     snd_device = SND_DEVICE_IN_VOICE_TTY_HCO_HEADSET_MIC;
                     break;
                 default:
-                    ALOGE("%s: Invalid TTY mode (%#x)", __func__, adev->tty_mode);
+                    ALOGE("%s: Invalid TTY mode (%#x)", __func__, adev->voice.tty_mode);
                 }
                 goto exit;
             }
@@ -911,6 +917,31 @@
     return max_channels;
 }
 
+int platform_set_incall_recording_session_id(void *platform __unused,
+                                             uint32_t session_id __unused, int rec_mode __unused)
+{
+    LOGE("%s: Not implemented", __func__);
+    return -ENOSYS;
+}
+
+int platform_stop_incall_recording_usecase(void *platform __unused)
+{
+    LOGE("%s: Not implemented", __func__);
+    return -ENOSYS;
+}
+
+int platform_start_incall_music_usecase(void *platform __unused)
+{
+    LOGE("%s: Not implemented", __func__);
+    return -ENOSYS;
+}
+
+int platform_stop_incall_music_usecase(void *platform __unused)
+{
+    LOGE("%s: Not implemented", __func__);
+    return -ENOSYS;
+}
+
 /* Delay in Us */
 int64_t platform_render_latency(audio_usecase_t usecase)
 {
diff --git a/hal/msm8960/platform.h b/hal/msm8960/platform.h
index a2ae80f..4d137aa 100644
--- a/hal/msm8960/platform.h
+++ b/hal/msm8960/platform.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 The Android Open Source Project
+ * Copyright (C) 2013-2014 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.
diff --git a/hal/msm8974/platform.c b/hal/msm8974/platform.c
index b7acc85..ad861e2 100644
--- a/hal/msm8974/platform.c
+++ b/hal/msm8974/platform.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 The Android Open Source Project
+ * Copyright (C) 2013-2014 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.
@@ -54,11 +54,7 @@
 /* Retry for delay in FW loading*/
 #define RETRY_NUMBER 10
 #define RETRY_US 500000
-
-#define MAX_VOL_INDEX 5
-#define MIN_VOL_INDEX 0
-#define percent_to_index(val, min, max) \
-	        ((val) * ((max) - (min)) * 0.01 + (min) + .5)
+#define MAX_SND_CARD 8
 
 struct audio_block_header
 {
@@ -108,6 +104,16 @@
                                           LOWLATENCY_PCM_DEVICE},
     [USECASE_VOICE_CALL] = {VOICE_CALL_PCM_DEVICE,
                             VOICE_CALL_PCM_DEVICE},
+    [USECASE_VOICE2_CALL] = {VOICE2_CALL_PCM_DEVICE, VOICE2_CALL_PCM_DEVICE},
+    [USECASE_VOLTE_CALL] = {VOLTE_CALL_PCM_DEVICE, VOLTE_CALL_PCM_DEVICE},
+    [USECASE_QCHAT_CALL] = {QCHAT_CALL_PCM_DEVICE, QCHAT_CALL_PCM_DEVICE},
+    [USECASE_VOWLAN_CALL] = {VOWLAN_CALL_PCM_DEVICE, VOWLAN_CALL_PCM_DEVICE},
+    [USECASE_INCALL_REC_UPLINK] = {AUDIO_RECORD_PCM_DEVICE,
+                                   AUDIO_RECORD_PCM_DEVICE},
+    [USECASE_INCALL_REC_DOWNLINK] = {AUDIO_RECORD_PCM_DEVICE,
+                                     AUDIO_RECORD_PCM_DEVICE},
+    [USECASE_INCALL_REC_UPLINK_AND_DOWNLINK] = {AUDIO_RECORD_PCM_DEVICE,
+                                                AUDIO_RECORD_PCM_DEVICE},
     [USECASE_AUDIO_HFP_SCO] = {HFP_PCM_RX, HFP_SCO_RX},
 };
 
@@ -250,24 +256,6 @@
     return is_tmus;
 }
 
-static int set_volume_values(int type, int volume, int* values)
-{
-    values[0] = volume;
-    values[1] = ALL_SESSION_VSID;
-
-    switch(type) {
-    case VOLUME_SET:
-        values[2] = DEFAULT_VOLUME_RAMP_DURATION_MS;
-        break;
-    case MUTE_SET:
-        values[2] = DEFAULT_MUTE_RAMP_DURATION;
-        break;
-    default:
-        return -EINVAL;
-    }
-    return 0;
-}
-
 static int set_echo_reference(struct mixer *mixer, const char* ec_ref)
 {
     struct mixer_ctl *ctl;
@@ -452,28 +440,41 @@
 {
     char value[PROPERTY_VALUE_MAX];
     struct platform_data *my_data;
-    int retry_num = 0;
+    int retry_num = 0, snd_card_num = 0;
     const char *snd_card_name;
 
-    adev->mixer = mixer_open(MIXER_CARD);
+    while (snd_card_num < MAX_SND_CARD) {
+        adev->mixer = mixer_open(snd_card_num);
 
-    while (!adev->mixer && retry_num < RETRY_NUMBER) {
-        usleep(RETRY_US);
-        adev->mixer = mixer_open(MIXER_CARD);
-        retry_num++;
+        while (!adev->mixer && retry_num < RETRY_NUMBER) {
+            usleep(RETRY_US);
+            adev->mixer = mixer_open(snd_card_num);
+            retry_num++;
+        }
+
+        if (!adev->mixer) {
+            ALOGE("%s: Unable to open the mixer card: %d", __func__,
+                   snd_card_num);
+            retry_num = 0;
+            snd_card_num++;
+            continue;
+        }
+
+        snd_card_name = mixer_get_name(adev->mixer);
+        ALOGD("%s: snd_card_name: %s", __func__, snd_card_name);
+
+        adev->audio_route = audio_route_init(snd_card_num, MIXER_XML_PATH);
+        if (!adev->audio_route) {
+            ALOGE("%s: Failed to init audio route controls, aborting.", __func__);
+            return NULL;
+        }
+        adev->snd_card = snd_card_num;
+        ALOGD("%s: Opened sound card:%d", __func__, snd_card_num);
+        break;
     }
 
-    if (!adev->mixer) {
-        ALOGE("Unable to open the mixer, aborting.");
-        return NULL;
-    }
-
-    snd_card_name = mixer_get_name(adev->mixer);
-    ALOGD("%s: snd_card_name: %s", __func__, snd_card_name);
-
-    adev->audio_route = audio_route_init(MIXER_CARD, MIXER_XML_PATH);
-    if (!adev->audio_route) {
-        ALOGE("%s: Failed to init audio route controls, aborting.", __func__);
+    if (snd_card_num >= MAX_SND_CARD) {
+        ALOGE("%s: Unable to find correct sound card, aborting.", __func__);
         return NULL;
     }
 
@@ -564,6 +565,8 @@
 
 void platform_deinit(void *platform)
 {
+    struct platform_data *my_data = (struct platform_data *)platform;
+    close_csd_client(my_data->csd);
     free(platform);
 }
 
@@ -722,13 +725,13 @@
     return ret;
 }
 
-int platform_start_voice_call(void *platform)
+int platform_start_voice_call(void *platform, uint32_t vsid)
 {
     struct platform_data *my_data = (struct platform_data *)platform;
     int ret = 0;
 
     if (my_data->csd != NULL) {
-        ret = my_data->csd->start_voice(VOICE_VSID);
+        ret = my_data->csd->start_voice(vsid);
         if (ret < 0) {
             ALOGE("%s: csd_start_voice error %d\n", __func__, ret);
         }
@@ -736,13 +739,13 @@
     return ret;
 }
 
-int platform_stop_voice_call(void *platform)
+int platform_stop_voice_call(void *platform, uint32_t vsid)
 {
     struct platform_data *my_data = (struct platform_data *)platform;
     int ret = 0;
 
     if (my_data->csd != NULL) {
-        ret = my_data->csd->stop_voice(VOICE_VSID);
+        ret = my_data->csd->stop_voice(vsid);
         if (ret < 0) {
             ALOGE("%s: csd_stop_voice error %d\n", __func__, ret);
         }
@@ -750,19 +753,36 @@
     return ret;
 }
 
+int platform_get_sample_rate(void *platform, uint32_t *rate)
+{
+    struct platform_data *my_data = (struct platform_data *)platform;
+    int ret = 0;
+
+    if (my_data->csd != NULL) {
+        ret = my_data->csd->get_sample_rate(rate);
+        if (ret < 0) {
+            ALOGE("%s: csd_get_sample_rate error %d\n", __func__, ret);
+        }
+    }
+    return ret;
+}
+
 int platform_set_voice_volume(void *platform, int volume)
 {
     struct platform_data *my_data = (struct platform_data *)platform;
     struct audio_device *adev = my_data->adev;
     struct mixer_ctl *ctl;
     const char *mixer_ctl_name = "Voice Rx Gain";
-    int values[VOLUME_CTL_PARAM_NUM];
-    int ret = 0;
+    int vol_index = 0, ret = 0;
+    uint32_t set_values[ ] = {0,
+                              ALL_SESSION_VSID,
+                              DEFAULT_VOLUME_RAMP_DURATION_MS};
 
     // Voice volume levels are mapped to adsp volume levels as follows.
     // 100 -> 5, 80 -> 4, 60 -> 3, 40 -> 2, 20 -> 1  0 -> 0
     // But this values don't changed in kernel. So, below change is need.
-    volume = (int)percent_to_index(volume, MIN_VOL_INDEX, MAX_VOL_INDEX);
+    vol_index = (int)percent_to_index(volume, MIN_VOL_INDEX, MAX_VOL_INDEX);
+    set_values[0] = vol_index;
 
     ctl = mixer_get_ctl_by_name(adev->mixer, mixer_ctl_name);
     if (!ctl) {
@@ -770,16 +790,9 @@
               __func__, mixer_ctl_name);
         return -EINVAL;
     }
-    ret = set_volume_values(VOLUME_SET, volume, values);
-    if (ret < 0) {
-        ALOGV("%s: failed setting volume by incorrect type", __func__);
-        return -EINVAL;
-    }
-    ret = mixer_ctl_set_array(ctl, values, sizeof(values)/sizeof(int));
-    if (ret < 0) {
-        ALOGV("%s: failed set mixer ctl by %d", __func__, ret);
-        return -EINVAL;
-    }
+    ALOGV("Setting voice volume index: %d", set_values[0]);
+    mixer_ctl_set_array(ctl, set_values, ARRAY_SIZE(set_values));
+
     if (my_data->csd != NULL) {
         ret = my_data->csd->volume(ALL_SESSION_VSID, volume,
                                    DEFAULT_VOLUME_RAMP_DURATION_MS);
@@ -796,30 +809,70 @@
     struct audio_device *adev = my_data->adev;
     struct mixer_ctl *ctl;
     const char *mixer_ctl_name = "Voice Tx Mute";
-    int values[VOLUME_CTL_PARAM_NUM];
     int ret = 0;
+    uint32_t set_values[ ] = {0,
+                              ALL_SESSION_VSID,
+                              DEFAULT_MUTE_RAMP_DURATION_MS};
 
-    if (adev->mode == AUDIO_MODE_IN_CALL) {
-        ctl = mixer_get_ctl_by_name(adev->mixer, mixer_ctl_name);
-        if (!ctl) {
-            ALOGE("%s: Could not get ctl for mixer cmd - %s",
-                  __func__, mixer_ctl_name);
-            return -EINVAL;
-        }
-        ALOGV("Setting mic mute: %d", state);
-        ret = set_volume_values(MUTE_SET, state, values);
+    if (adev->mode != AUDIO_MODE_IN_CALL)
+        return 0;
+
+    set_values[0] = state;
+    ctl = mixer_get_ctl_by_name(adev->mixer, mixer_ctl_name);
+    if (!ctl) {
+        ALOGE("%s: Could not get ctl for mixer cmd - %s",
+              __func__, mixer_ctl_name);
+        return -EINVAL;
+    }
+    ALOGV("Setting voice mute state: %d", state);
+    mixer_ctl_set_array(ctl, set_values, ARRAY_SIZE(set_values));
+
+    if (my_data->csd != NULL) {
+        ret = my_data->csd->mic_mute(ALL_SESSION_VSID, state,
+                                     DEFAULT_MUTE_RAMP_DURATION_MS);
         if (ret < 0) {
-            ALOGV("%s: failed setting mute by incorrect type", __func__);
-            return -EINVAL;
-        }
-        ret = mixer_ctl_set_array(ctl, values, sizeof(values)/sizeof(int));
-        if (ret < 0) {
-            ALOGV("%s: failed set mixer ctl by %d", __func__, ret);
-            return -EINVAL;
+            ALOGE("%s: csd_mic_mute error %d", __func__, ret);
         }
     }
+    return ret;
+}
 
-    return 0;
+int platform_set_device_mute(void *platform, bool state, char *dir)
+{
+    struct platform_data *my_data = (struct platform_data *)platform;
+    struct audio_device *adev = my_data->adev;
+    struct mixer_ctl *ctl;
+    char *mixer_ctl_name = NULL;
+    int ret = 0;
+    uint32_t set_values[ ] = {0,
+                              ALL_SESSION_VSID,
+                              0};
+    if(dir == NULL) {
+        ALOGE("%s: Invalid direction:%s", __func__, dir);
+        return -EINVAL;
+    }
+
+    if (!strncmp("rx", dir, sizeof("rx"))) {
+        mixer_ctl_name = "Voice Rx Device Mute";
+    } else if (!strncmp("tx", dir, sizeof("tx"))) {
+        mixer_ctl_name = "Voice Tx Device Mute";
+    } else {
+        return -EINVAL;
+    }
+
+    set_values[0] = state;
+    ctl = mixer_get_ctl_by_name(adev->mixer, mixer_ctl_name);
+    if (!ctl) {
+        ALOGE("%s: Could not get ctl for mixer cmd - %s",
+              __func__, mixer_ctl_name);
+        return -EINVAL;
+    }
+
+    ALOGV("%s: Setting device mute state: %d, mixer ctrl:%s",
+          __func__,state, mixer_ctl_name);
+    mixer_ctl_set_array(ctl, set_values, ARRAY_SIZE(set_values));
+
+    return ret;
 }
 
 snd_device_t platform_get_output_snd_device(void *platform, audio_devices_t devices)
@@ -839,11 +892,11 @@
     if (mode == AUDIO_MODE_IN_CALL) {
         if (devices & AUDIO_DEVICE_OUT_WIRED_HEADPHONE ||
             devices & AUDIO_DEVICE_OUT_WIRED_HEADSET) {
-            if (adev->tty_mode == TTY_MODE_FULL)
+            if (adev->voice.tty_mode == TTY_MODE_FULL)
                 snd_device = SND_DEVICE_OUT_VOICE_TTY_FULL_HEADPHONES;
-            else if (adev->tty_mode == TTY_MODE_VCO)
+            else if (adev->voice.tty_mode == TTY_MODE_VCO)
                 snd_device = SND_DEVICE_OUT_VOICE_TTY_VCO_HEADPHONES;
-            else if (adev->tty_mode == TTY_MODE_HCO)
+            else if (adev->voice.tty_mode == TTY_MODE_HCO)
                 snd_device = SND_DEVICE_OUT_VOICE_TTY_HCO_HANDSET;
             else
                 snd_device = SND_DEVICE_OUT_VOICE_HEADPHONES;
@@ -938,10 +991,10 @@
             ALOGE("%s: No output device set for voice call", __func__);
             goto exit;
         }
-        if (adev->tty_mode != TTY_MODE_OFF) {
+        if (adev->voice.tty_mode != TTY_MODE_OFF) {
             if (out_device & AUDIO_DEVICE_OUT_WIRED_HEADPHONE ||
                 out_device & AUDIO_DEVICE_OUT_WIRED_HEADSET) {
-                switch (adev->tty_mode) {
+                switch (adev->voice.tty_mode) {
                 case TTY_MODE_FULL:
                     snd_device = SND_DEVICE_IN_VOICE_TTY_FULL_HEADSET_MIC;
                     break;
@@ -952,7 +1005,7 @@
                     snd_device = SND_DEVICE_IN_VOICE_TTY_HCO_HEADSET_MIC;
                     break;
                 default:
-                    ALOGE("%s: Invalid TTY mode (%#x)", __func__, adev->tty_mode);
+                    ALOGE("%s: Invalid TTY mode (%#x)", __func__, adev->voice.tty_mode);
                 }
                 goto exit;
             }
@@ -1179,6 +1232,92 @@
     return max_channels;
 }
 
+int platform_set_incall_recording_session_id(void *platform,
+                                             uint32_t session_id, int rec_mode)
+{
+    int ret = 0;
+    struct platform_data *my_data = (struct platform_data *)platform;
+    struct audio_device *adev = my_data->adev;
+    struct mixer_ctl *ctl;
+    const char *mixer_ctl_name = "Voc VSID";
+    int num_ctl_values;
+    int i;
+
+    ctl = mixer_get_ctl_by_name(adev->mixer, mixer_ctl_name);
+    if (!ctl) {
+        ALOGE("%s: Could not get ctl for mixer cmd - %s",
+              __func__, mixer_ctl_name);
+        ret = -EINVAL;
+    } else {
+        num_ctl_values = mixer_ctl_get_num_values(ctl);
+        for (i = 0; i < num_ctl_values; i++) {
+            if (mixer_ctl_set_value(ctl, i, session_id)) {
+                ALOGV("Error: invalid session_id: %x", session_id);
+                ret = -EINVAL;
+                break;
+            }
+        }
+    }
+
+    if (my_data->csd != NULL) {
+        ret = my_data->csd->start_record(ALL_SESSION_VSID, rec_mode);
+        if (ret < 0) {
+            ALOGE("%s: csd_client_start_record failed, error %d",
+                  __func__, ret);
+        }
+    }
+
+    return ret;
+}
+
+int platform_stop_incall_recording_usecase(void *platform)
+{
+    int ret = 0;
+    struct platform_data *my_data = (struct platform_data *)platform;
+
+    if (my_data->csd != NULL) {
+        ret = my_data->csd->stop_record(ALL_SESSION_VSID);
+        if (ret < 0) {
+            ALOGE("%s: csd_client_stop_record failed, error %d",
+                  __func__, ret);
+        }
+    }
+
+    return ret;
+}
+
+int platform_start_incall_music_usecase(void *platform)
+{
+    int ret = 0;
+    struct platform_data *my_data = (struct platform_data *)platform;
+
+    if (my_data->csd != NULL) {
+        ret = my_data->csd->start_playback(ALL_SESSION_VSID);
+        if (ret < 0) {
+            ALOGE("%s: csd_client_start_playback failed, error %d",
+                  __func__, ret);
+        }
+    }
+
+    return ret;
+}
+
+int platform_stop_incall_music_usecase(void *platform)
+{
+    int ret = 0;
+    struct platform_data *my_data = (struct platform_data *)platform;
+
+    if (my_data->csd != NULL) {
+        ret = my_data->csd->stop_playback(ALL_SESSION_VSID);
+        if (ret < 0) {
+            ALOGE("%s: csd_client_stop_playback failed, error %d",
+                  __func__, ret);
+        }
+    }
+
+    return ret;
+}
+
 /* Delay in Us */
 int64_t platform_render_latency(audio_usecase_t usecase)
 {
diff --git a/hal/msm8974/platform.h b/hal/msm8974/platform.h
index 42bf8e5..267f90f 100644
--- a/hal/msm8974/platform.h
+++ b/hal/msm8974/platform.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 The Android Open Source Project
+ * Copyright (C) 2013-2014 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.
@@ -91,17 +91,11 @@
 
 };
 
-#define MIXER_CARD 0
-#define SOUND_CARD 0
-
 #define DEFAULT_OUTPUT_SAMPLING_RATE 48000
 
-#define ALL_SESSION_VSID    0xFFFFFFFF
-#define DEFAULT_MUTE_RAMP_DURATION      20
+#define ALL_SESSION_VSID                0xFFFFFFFF
+#define DEFAULT_MUTE_RAMP_DURATION_MS   20
 #define DEFAULT_VOLUME_RAMP_DURATION_MS 20
-#define VOLUME_SET 0
-#define MUTE_SET 1
-#define VOLUME_CTL_PARAM_NUM 3
 
 #ifdef MSM8084
 #define ACDB_ID_VOICE_HANDSET_TMUS 88
@@ -110,6 +104,12 @@
 #define ACDB_ID_VOICE_HANDSET_TMUS 7
 #define ACDB_ID_VOICE_DMIC_EF_TMUS 41
 #endif
+
+#define MAX_VOL_INDEX 5
+#define MIN_VOL_INDEX 0
+#define percent_to_index(val, min, max) \
+            ((val) * ((max) - (min)) * 0.01 + (min) + .5)
+
 /*
  * tinyAlsa library interprets period size as number of frames
  * one frame = channel_count * sizeof (pcm sample)
@@ -143,8 +143,16 @@
 #define VOICE_VSID  0x10C01000
 #ifdef PLATFORM_MSM8084
 #define VOICE_CALL_PCM_DEVICE 20
+#define VOICE2_CALL_PCM_DEVICE 25
+#define VOLTE_CALL_PCM_DEVICE 21
+#define QCHAT_CALL_PCM_DEVICE 33
+#define VOWLAN_CALL_PCM_DEVICE -1
 #else
 #define VOICE_CALL_PCM_DEVICE 2
+#define VOICE2_CALL_PCM_DEVICE 22
+#define VOLTE_CALL_PCM_DEVICE 14
+#define QCHAT_CALL_PCM_DEVICE 20
+#define VOWLAN_CALL_PCM_DEVICE 36
 #endif
 
 #define HFP_PCM_RX 5
diff --git a/hal/platform_api.h b/hal/platform_api.h
index 7079e8c..6dd4f26 100644
--- a/hal/platform_api.h
+++ b/hal/platform_api.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 The Android Open Source Project
+ * Copyright (C) 2013-2014 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.
@@ -33,10 +33,12 @@
 int platform_switch_voice_call_usecase_route_post(void *platform,
                                                   snd_device_t out_snd_device,
                                                   snd_device_t in_snd_device);
-int platform_start_voice_call(void *platform);
-int platform_stop_voice_call(void *platform);
+int platform_start_voice_call(void *platform, uint32_t vsid);
+int platform_stop_voice_call(void *platform, uint32_t vsid);
 int platform_set_voice_volume(void *platform, int volume);
 int platform_set_mic_mute(void *platform, bool state);
+int platform_get_sample_rate(void *platform, uint32_t *rate);
+int platform_set_device_mute(void *platform, bool state, char *dir);
 snd_device_t platform_get_output_snd_device(void *platform, audio_devices_t devices);
 snd_device_t platform_get_input_snd_device(void *platform, audio_devices_t out_device);
 int platform_set_hdmi_channels(void *platform, int channel_count);
@@ -45,4 +47,10 @@
 /* returns the latency for a usecase in Us */
 int64_t platform_render_latency(audio_usecase_t usecase);
 
+int platform_set_incall_recording_session_id(void *platform,
+                                             uint32_t session_id, int rec_mode);
+int platform_stop_incall_recording_usecase(void *platform);
+int platform_start_incall_music_usecase(void *platform);
+int platform_stop_incall_music_usecase(void *platform);
+
 #endif // QCOM_AUDIO_PLATFORM_API_H
diff --git a/hal/voice.c b/hal/voice.c
new file mode 100644
index 0000000..cc509af
--- /dev/null
+++ b/hal/voice.c
@@ -0,0 +1,451 @@
+/*
+ * Copyright (C) 2014 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 "voice"
+/*#define LOG_NDEBUG 0*/
+#define LOG_NDDEBUG 0
+
+#include <errno.h>
+#include <math.h>
+#include <cutils/log.h>
+#include <cutils/str_parms.h>
+
+#include "audio_hw.h"
+#include "voice.h"
+#include "voice_extn/voice_extn.h"
+#include "platform.h"
+#include "platform_api.h"
+
+struct pcm_config pcm_config_voice_call = {
+    .channels = 1,
+    .rate = 8000,
+    .period_size = 160,
+    .period_count = 2,
+    .format = PCM_FORMAT_S16_LE,
+};
+
+extern const char * const use_case_table[AUDIO_USECASE_MAX];
+
+static struct voice_session *voice_get_session_from_use_case(struct audio_device *adev,
+                              audio_usecase_t usecase_id)
+{
+    struct voice_session *session = NULL;
+    int ret = 0;
+
+    ret = voice_extn_get_session_from_use_case(adev, usecase_id, &session);
+    if (ret == -ENOSYS) {
+        session = &adev->voice.session[VOICE_SESS_IDX];
+    }
+
+    return session;
+}
+
+int stop_call(struct audio_device *adev, audio_usecase_t usecase_id)
+{
+    int i, ret = 0;
+    struct audio_usecase *uc_info;
+    struct voice_session *session = NULL;
+
+    ALOGD("%s: enter usecase:%s", __func__, use_case_table[usecase_id]);
+
+    session = (struct voice_session *)voice_get_session_from_use_case(adev, usecase_id);
+    session->state.current = CALL_INACTIVE;
+
+    ret = platform_stop_voice_call(adev->platform, session->vsid);
+
+    /* 1. Close the PCM devices */
+    if (session->pcm_rx) {
+        pcm_close(session->pcm_rx);
+        session->pcm_rx = NULL;
+    }
+    if (session->pcm_tx) {
+        pcm_close(session->pcm_tx);
+        session->pcm_tx = NULL;
+    }
+
+    uc_info = get_usecase_from_list(adev, usecase_id);
+    if (uc_info == NULL) {
+        ALOGE("%s: Could not find the usecase (%d) in the list",
+              __func__, usecase_id);
+        return -EINVAL;
+    }
+
+    /* 2. Get and set stream specific mixer controls */
+    disable_audio_route(adev, uc_info);
+
+    /* 3. Disable the rx and tx devices */
+    disable_snd_device(adev, uc_info->out_snd_device);
+    disable_snd_device(adev, uc_info->in_snd_device);
+
+    list_remove(&uc_info->list);
+    free(uc_info);
+
+    ALOGD("%s: exit: status(%d)", __func__, ret);
+    return ret;
+}
+
+int start_call(struct audio_device *adev, audio_usecase_t usecase_id)
+{
+    int i, ret = 0;
+    struct audio_usecase *uc_info;
+    int pcm_dev_rx_id, pcm_dev_tx_id;
+    uint32_t sample_rate = 8000;
+    struct voice_session *session = NULL;
+    struct pcm_config voice_config = pcm_config_voice_call;
+
+    ALOGD("%s: enter usecase:%s", __func__, use_case_table[usecase_id]);
+
+    session = (struct voice_session *)voice_get_session_from_use_case(adev, usecase_id);
+    uc_info = (struct audio_usecase *)calloc(1, sizeof(struct audio_usecase));
+    uc_info->id = usecase_id;
+    uc_info->type = VOICE_CALL;
+    uc_info->stream.out = adev->primary_output;
+    uc_info->devices = adev->primary_output->devices;
+    uc_info->in_snd_device = SND_DEVICE_NONE;
+    uc_info->out_snd_device = SND_DEVICE_NONE;
+
+    list_add_tail(&adev->usecase_list, &uc_info->list);
+
+    select_devices(adev, usecase_id);
+
+    pcm_dev_rx_id = platform_get_pcm_device_id(uc_info->id, PCM_PLAYBACK);
+    pcm_dev_tx_id = platform_get_pcm_device_id(uc_info->id, PCM_CAPTURE);
+
+    if (pcm_dev_rx_id < 0 || pcm_dev_tx_id < 0) {
+        ALOGE("%s: Invalid PCM devices (rx: %d tx: %d) for the usecase(%d)",
+              __func__, pcm_dev_rx_id, pcm_dev_tx_id, uc_info->id);
+        ret = -EIO;
+        goto error_start_voice;
+    }
+    ret = platform_get_sample_rate(adev->platform, &sample_rate);
+    if (ret < 0) {
+        ALOGE("platform_get_sample_rate error %d\n", ret);
+    } else {
+        voice_config.rate = sample_rate;
+    }
+    ALOGD("voice_config.rate %d\n", voice_config.rate);
+
+    ALOGV("%s: Opening PCM playback device card_id(%d) device_id(%d)",
+          __func__, adev->snd_card, pcm_dev_rx_id);
+    session->pcm_rx = pcm_open(adev->snd_card,
+                               pcm_dev_rx_id,
+                               PCM_OUT, &voice_config);
+    if (session->pcm_rx && !pcm_is_ready(session->pcm_rx)) {
+        ALOGE("%s: %s", __func__, pcm_get_error(session->pcm_rx));
+        ret = -EIO;
+        goto error_start_voice;
+    }
+
+    ALOGV("%s: Opening PCM capture device card_id(%d) device_id(%d)",
+          __func__, adev->snd_card, pcm_dev_tx_id);
+    session->pcm_tx = pcm_open(adev->snd_card,
+                               pcm_dev_tx_id,
+                               PCM_IN, &voice_config);
+    if (session->pcm_tx && !pcm_is_ready(session->pcm_tx)) {
+        ALOGE("%s: %s", __func__, pcm_get_error(session->pcm_tx));
+        ret = -EIO;
+        goto error_start_voice;
+    }
+    pcm_start(session->pcm_rx);
+    pcm_start(session->pcm_tx);
+
+    voice_set_volume(adev, adev->voice.volume);
+
+    ret = platform_start_voice_call(adev->platform, session->vsid);
+    if (ret < 0) {
+        ALOGE("%s: platform_start_voice_call error %d\n", __func__, ret);
+        goto error_start_voice;
+    }
+
+    session->state.current = CALL_ACTIVE;
+    return 0;
+
+error_start_voice:
+    stop_call(adev, usecase_id);
+
+    ALOGD("%s: exit: status(%d)", __func__, ret);
+    return ret;
+}
+
+bool voice_is_in_call(struct audio_device *adev)
+{
+    bool in_call = false;
+    int ret = 0;
+
+    ret = voice_extn_is_in_call(adev, &in_call);
+    if (ret == -ENOSYS) {
+        in_call = (adev->voice.session[VOICE_SESS_IDX].state.current == CALL_ACTIVE) ? true : false;
+    }
+
+    return in_call;
+}
+
+bool voice_is_in_call_rec_stream(struct stream_in *in)
+{
+    bool in_call_rec = false;
+    int ret = 0;
+
+    ret = voice_extn_is_in_call_rec_stream(in, &in_call_rec);
+    if (ret == -ENOSYS) {
+        in_call_rec = false;
+    }
+
+    return in_call_rec;
+}
+
+uint32_t voice_get_active_session_id(struct audio_device *adev)
+{
+    int ret = 0;
+    uint32_t session_id;
+
+    ret = voice_extn_get_active_session_id(adev, &session_id);
+    if (ret == -ENOSYS) {
+        session_id = VOICE_VSID;
+    }
+    return session_id;
+}
+
+int voice_check_and_set_incall_rec_usecase(struct audio_device *adev,
+                                           struct stream_in *in)
+{
+    int ret = 0;
+    uint32_t session_id;
+    int usecase_id;
+    int rec_mode = INCALL_REC_NONE;
+
+    if (voice_is_in_call(adev)) {
+        switch (in->source) {
+        case AUDIO_SOURCE_VOICE_UPLINK:
+            in->usecase = USECASE_INCALL_REC_UPLINK;
+            rec_mode = INCALL_REC_UPLINK;
+            break;
+        case AUDIO_SOURCE_VOICE_DOWNLINK:
+            in->usecase = USECASE_INCALL_REC_DOWNLINK;
+            rec_mode = INCALL_REC_DOWNLINK;
+            break;
+        case AUDIO_SOURCE_VOICE_CALL:
+            in->usecase = USECASE_INCALL_REC_UPLINK_AND_DOWNLINK;
+            rec_mode = INCALL_REC_UPLINK_AND_DOWNLINK;
+            break;
+        default:
+            ALOGV("%s: Source type %d doesnt match incall recording criteria",
+                  __func__, in->source);
+            return ret;
+        }
+
+        session_id = voice_get_active_session_id(adev);
+        ret = platform_set_incall_recording_session_id(adev->platform,
+                                                       session_id, rec_mode);
+        ALOGV("%s: Update usecase to %d",__func__, in->usecase);
+    } else {
+        ALOGV("%s: voice call not active", __func__);
+    }
+
+    return ret;
+}
+
+int voice_check_and_stop_incall_rec_usecase(struct audio_device *adev,
+                                            struct stream_in *in)
+{
+    int ret = 0;
+
+    if (in->source == AUDIO_SOURCE_VOICE_UPLINK ||
+        in->source == AUDIO_SOURCE_VOICE_DOWNLINK ||
+        in->source == AUDIO_SOURCE_VOICE_CALL) {
+        ret = platform_stop_incall_recording_usecase(adev->platform);
+        ALOGV("%s: Stop In-call recording", __func__);
+    }
+
+    return ret;
+}
+
+int voice_check_and_set_incall_music_usecase(struct audio_device *adev,
+                                             struct stream_out *out)
+{
+    int ret = 0;
+
+    ret = voice_extn_check_and_set_incall_music_usecase(adev, out);
+    if (ret == -ENOSYS) {
+        /* Incall music delivery is used only for LCH call state */
+        ret = -EINVAL;
+    }
+
+    return ret;
+}
+
+int voice_set_mic_mute(struct audio_device *adev, bool state)
+{
+    int err = 0;
+
+    adev->voice.mic_mute = state;
+    if (adev->mode == AUDIO_MODE_IN_CALL)
+        err = platform_set_mic_mute(adev->platform, state);
+
+    return err;
+}
+
+bool voice_get_mic_mute(struct audio_device *adev)
+{
+    return adev->voice.mic_mute;
+}
+
+int voice_set_volume(struct audio_device *adev, float volume)
+{
+    int vol, err = 0;
+
+    adev->voice.volume = volume;
+    if (adev->mode == AUDIO_MODE_IN_CALL) {
+        if (volume < 0.0) {
+            volume = 0.0;
+        } else if (volume > 1.0) {
+            volume = 1.0;
+        }
+
+        vol = lrint(volume * 100.0);
+
+        // Voice volume levels from android are mapped to driver volume levels as follows.
+        // 0 -> 5, 20 -> 4, 40 ->3, 60 -> 2, 80 -> 1, 100 -> 0
+        // So adjust the volume to get the correct volume index in driver
+        vol = 100 - vol;
+
+        err = platform_set_voice_volume(adev->platform, vol);
+    }
+
+    return err;
+}
+
+int voice_start_call(struct audio_device *adev)
+{
+    int ret = 0;
+
+    ret = voice_extn_start_call(adev);
+    if (ret == -ENOSYS) {
+        ret = start_call(adev, USECASE_VOICE_CALL);
+    }
+
+    return ret;
+}
+
+int voice_stop_call(struct audio_device *adev)
+{
+    int ret = 0;
+
+    ret = voice_extn_stop_call(adev);
+    if (ret == -ENOSYS) {
+        ret = stop_call(adev, USECASE_VOICE_CALL);
+    }
+
+    return ret;
+}
+
+void voice_get_parameters(struct audio_device *adev,
+                          struct str_parms *query,
+                          struct str_parms *reply)
+{
+    voice_extn_get_parameters(adev, query, reply);
+}
+
+int voice_set_parameters(struct audio_device *adev, struct str_parms *parms)
+{
+    char *str;
+    char value[32];
+    int val;
+    int ret = 0, err;
+    char *kv_pairs = str_parms_to_str(parms);
+
+    ALOGV_IF(kv_pairs != NULL, "%s: enter: %s", __func__, kv_pairs);
+
+    ret = voice_extn_set_parameters(adev, parms);
+    if (ret != 0)
+        goto done;
+
+    err = str_parms_get_str(parms, AUDIO_PARAMETER_KEY_TTY_MODE, value, sizeof(value));
+    if (err >= 0) {
+        int tty_mode;
+        str_parms_del(parms, AUDIO_PARAMETER_KEY_TTY_MODE);
+        if (strcmp(value, AUDIO_PARAMETER_VALUE_TTY_OFF) == 0)
+            tty_mode = TTY_MODE_OFF;
+        else if (strcmp(value, AUDIO_PARAMETER_VALUE_TTY_VCO) == 0)
+            tty_mode = TTY_MODE_VCO;
+        else if (strcmp(value, AUDIO_PARAMETER_VALUE_TTY_HCO) == 0)
+            tty_mode = TTY_MODE_HCO;
+        else if (strcmp(value, AUDIO_PARAMETER_VALUE_TTY_FULL) == 0)
+            tty_mode = TTY_MODE_FULL;
+        else {
+            ret = -EINVAL;
+            goto done;
+        }
+
+        if (tty_mode != adev->voice.tty_mode) {
+            adev->voice.tty_mode = tty_mode;
+            adev->acdb_settings = (adev->acdb_settings & TTY_MODE_CLEAR) | tty_mode;
+            if (voice_is_in_call(adev))
+               voice_update_devices_for_all_voice_usecases(adev);
+        }
+    }
+
+    err = str_parms_get_str(parms, AUDIO_PARAMETER_KEY_INCALLMUSIC,
+                            value, sizeof(value));
+    if (err >= 0) {
+        str_parms_del(parms, AUDIO_PARAMETER_KEY_INCALLMUSIC);
+        if (strcmp(value, AUDIO_PARAMETER_VALUE_TRUE) == 0)
+            platform_start_incall_music_usecase(adev->platform);
+        else
+            platform_stop_incall_music_usecase(adev->platform);
+     }
+
+done:
+    ALOGV("%s: exit with code(%d)", __func__, ret);
+    free(kv_pairs);
+    return ret;
+}
+
+void voice_init(struct audio_device *adev)
+{
+    int i = 0;
+
+    memset(&adev->voice, 0, sizeof(adev->voice));
+    adev->voice.tty_mode = TTY_MODE_OFF;
+    adev->voice.volume = 1.0f;
+    adev->voice.mic_mute = false;
+    adev->voice.voice_device_set = false;
+    for (i = 0; i < MAX_VOICE_SESSIONS; i++) {
+        adev->voice.session[i].pcm_rx = NULL;
+        adev->voice.session[i].pcm_tx = NULL;
+        adev->voice.session[i].state.current = CALL_INACTIVE;
+        adev->voice.session[i].state.new = CALL_INACTIVE;
+        adev->voice.session[i].vsid = VOICE_VSID;
+    }
+
+    voice_extn_init(adev);
+}
+
+void voice_update_devices_for_all_voice_usecases(struct audio_device *adev)
+{
+    struct listnode *node;
+    struct audio_usecase *usecase;
+
+    list_for_each(node, &adev->usecase_list) {
+        usecase = node_to_item(node, struct audio_usecase, list);
+        if (usecase->type == VOICE_CALL) {
+            ALOGV("%s: updating device for usecase:%s", __func__,
+                  use_case_table[usecase->id]);
+            select_devices(adev, usecase->id);
+        }
+    }
+}
+
+
diff --git a/hal/voice.h b/hal/voice.h
new file mode 100644
index 0000000..ba2240c
--- /dev/null
+++ b/hal/voice.h
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2014 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 VOICE_H
+#define VOICE_H
+
+#define BASE_SESS_IDX       0
+#define VOICE_SESS_IDX     (BASE_SESS_IDX)
+
+#ifdef MULTI_VOICE_SESSION_ENABLED
+#define MAX_VOICE_SESSIONS 5
+#else
+#define MAX_VOICE_SESSIONS 1
+#endif
+
+#define BASE_CALL_STATE     1
+#define CALL_INACTIVE       (BASE_CALL_STATE)
+#define CALL_ACTIVE         (BASE_CALL_STATE + 1)
+
+#define VOICE_VSID  0x10C01000
+
+#define AUDIO_PARAMETER_KEY_INCALLMUSIC "incall_music_enabled"
+#define AUDIO_PARAMETER_VALUE_TRUE "true"
+
+struct audio_device;
+struct str_parms;
+struct stream_in;
+struct stream_out;
+
+struct call_state {
+    int current;
+    int new;
+};
+
+struct voice_session {
+    struct pcm *pcm_rx;
+    struct pcm *pcm_tx;
+    struct call_state state;
+    uint32_t vsid;
+};
+
+struct voice {
+    struct voice_session session[MAX_VOICE_SESSIONS];
+    int tty_mode;
+    bool mic_mute;
+    float volume;
+    bool voice_device_set;
+};
+
+enum {
+    INCALL_REC_NONE = -1,
+    INCALL_REC_UPLINK,
+    INCALL_REC_DOWNLINK,
+    INCALL_REC_UPLINK_AND_DOWNLINK,
+};
+
+int voice_start_call(struct audio_device *adev);
+int voice_stop_call(struct audio_device *adev);
+int voice_set_parameters(struct audio_device *adev, struct str_parms *parms);
+void voice_get_parameters(struct audio_device *adev, struct str_parms *query,
+                          struct str_parms *reply);
+void voice_init(struct audio_device *adev);
+bool voice_is_in_call(struct audio_device *adev);
+bool voice_is_in_call_rec_stream(struct stream_in *in);
+int voice_set_mic_mute(struct audio_device *dev, bool state);
+bool voice_get_mic_mute(struct audio_device *dev);
+int voice_set_volume(struct audio_device *adev, float volume);
+int voice_check_and_set_incall_rec_usecase(struct audio_device *adev,
+                                           struct stream_in *in);
+int voice_check_and_set_incall_music_usecase(struct audio_device *adev,
+                                             struct stream_out *out);
+int voice_check_and_stop_incall_rec_usecase(struct audio_device *adev,
+                                            struct stream_in *in);
+void voice_update_devices_for_all_voice_usecases(struct audio_device *adev);
+#endif //VOICE_H
diff --git a/hal/voice_extn/voice_extn.c b/hal/voice_extn/voice_extn.c
new file mode 100644
index 0000000..05c5fcb
--- /dev/null
+++ b/hal/voice_extn/voice_extn.c
@@ -0,0 +1,585 @@
+/*
+ * Copyright (C) 2014 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 "voice_extn"
+/*#define LOG_NDEBUG 0*/
+#define LOG_NDDEBUG 0
+
+#include <errno.h>
+#include <math.h>
+#include <cutils/log.h>
+#include <cutils/str_parms.h>
+#include <sys/ioctl.h>
+#include <sound/voice_params.h>
+
+#include "audio_hw.h"
+#include "voice.h"
+#include "platform.h"
+#include "platform_api.h"
+#include "voice_extn.h"
+
+#define AUDIO_PARAMETER_KEY_VSID                "vsid"
+#define AUDIO_PARAMETER_KEY_CALL_STATE          "call_state"
+#define AUDIO_PARAMETER_KEY_AUDIO_MODE          "audio_mode"
+#define AUDIO_PARAMETER_KEY_ALL_CALL_STATES     "all_call_states"
+#define AUDIO_PARAMETER_KEY_DEVICE_MUTE         "device_mute"
+#define AUDIO_PARAMETER_KEY_DIRECTION           "direction"
+
+#define VOICE_EXTN_PARAMETER_VALUE_MAX_LEN 256
+
+#define VOICE2_VSID 0x10DC1000
+#define VOLTE_VSID  0x10C02000
+#define QCHAT_VSID  0x10803000
+#define VOWLAN_VSID 0x10002000
+#define ALL_VSID    0xFFFFFFFF
+
+/* Voice Session Indices */
+#define VOICE2_SESS_IDX    (VOICE_SESS_IDX + 1)
+#define VOLTE_SESS_IDX     (VOICE_SESS_IDX + 2)
+#define QCHAT_SESS_IDX     (VOICE_SESS_IDX + 3)
+#define VOWLAN_SESS_IDX    (VOICE_SESS_IDX + 4)
+
+/* Call States */
+#define CALL_HOLD           (BASE_CALL_STATE + 2)
+#define CALL_LOCAL_HOLD     (BASE_CALL_STATE + 3)
+
+struct pcm_config pcm_config_incall_music = {
+    .channels = 1,
+    .rate = DEFAULT_OUTPUT_SAMPLING_RATE,
+    .period_size = LOW_LATENCY_OUTPUT_PERIOD_SIZE,
+    .period_count = LOW_LATENCY_OUTPUT_PERIOD_COUNT,
+    .format = PCM_FORMAT_S16_LE,
+    .start_threshold = LOW_LATENCY_OUTPUT_PERIOD_SIZE / 4,
+    .stop_threshold = INT_MAX,
+    .avail_min = LOW_LATENCY_OUTPUT_PERIOD_SIZE / 4,
+};
+
+extern int start_call(struct audio_device *adev, audio_usecase_t usecase_id);
+extern int stop_call(struct audio_device *adev, audio_usecase_t usecase_id);
+int voice_extn_is_in_call(struct audio_device *adev, bool *in_call);
+
+static bool is_valid_call_state(int call_state)
+{
+    if (call_state < CALL_INACTIVE || call_state > CALL_LOCAL_HOLD)
+        return false;
+    else
+        return true;
+}
+
+static bool is_valid_vsid(uint32_t vsid)
+{
+    if (vsid == VOICE_VSID ||
+        vsid == VOICE2_VSID ||
+        vsid == VOLTE_VSID ||
+        vsid == QCHAT_VSID ||
+        vsid == VOWLAN_VSID)
+        return true;
+    else
+        return false;
+}
+
+static audio_usecase_t voice_extn_get_usecase_for_session_idx(const int index)
+{
+    audio_usecase_t usecase_id = -1;
+
+    switch(index) {
+    case VOICE_SESS_IDX:
+        usecase_id = USECASE_VOICE_CALL;
+        break;
+
+    case VOICE2_SESS_IDX:
+        usecase_id = USECASE_VOICE2_CALL;
+        break;
+
+    case VOLTE_SESS_IDX:
+        usecase_id = USECASE_VOLTE_CALL;
+        break;
+
+    case QCHAT_SESS_IDX:
+        usecase_id = USECASE_QCHAT_CALL;
+        break;
+
+    case VOWLAN_SESS_IDX:
+        usecase_id = USECASE_VOWLAN_CALL;
+        break;
+
+    default:
+        ALOGE("%s: Invalid voice session index\n", __func__);
+    }
+
+    return usecase_id;
+}
+
+static uint32_t get_session_id_with_state(struct audio_device *adev,
+                                          int call_state)
+{
+    struct voice_session *session = NULL;
+    int i = 0;
+    uint32_t session_id = 0;
+
+    for (i = 0; i < MAX_VOICE_SESSIONS; i++) {
+        session = &adev->voice.session[i];
+        if(session->state.current == call_state){
+            session_id = session->vsid;
+            break;
+        }
+    }
+
+    return session_id;
+}
+
+static int update_calls(struct audio_device *adev)
+{
+    int i = 0;
+    audio_usecase_t usecase_id = 0;
+    enum voice_lch_mode lch_mode;
+    struct voice_session *session = NULL;
+    int fd = 0;
+    int ret = 0;
+    bool is_in_call = false;
+
+    ALOGD("%s: enter:", __func__);
+
+    for (i = 0; i < MAX_VOICE_SESSIONS; i++) {
+        usecase_id = voice_extn_get_usecase_for_session_idx(i);
+        session = &adev->voice.session[i];
+        ALOGD("%s: cur_state=%d new_state=%d vsid=%x",
+              __func__, session->state.current, session->state.new, session->vsid);
+
+        switch(session->state.new)
+        {
+        case CALL_ACTIVE:
+            switch(session->state.current)
+            {
+            case CALL_INACTIVE:
+                ALOGD("%s: INACTIVE -> ACTIVE vsid:%x", __func__, session->vsid);
+                ret = start_call(adev, usecase_id);
+                if(ret < 0) {
+                    ALOGE("%s: voice_start_call() failed for usecase: %d\n",
+                          __func__, usecase_id);
+                } else {
+                    session->state.current = session->state.new;
+                }
+                break;
+
+            case CALL_HOLD:
+                ALOGD("%s: HOLD -> ACTIVE vsid:%x", __func__, session->vsid);
+                session->state.current = session->state.new;
+                break;
+
+            case CALL_LOCAL_HOLD:
+                ALOGD("%s: LOCAL_HOLD -> ACTIVE vsid:%x", __func__, session->vsid);
+                lch_mode = VOICE_LCH_STOP;
+                if (pcm_ioctl(session->pcm_tx, SNDRV_VOICE_IOCTL_LCH, &lch_mode) < 0) {
+                    ALOGE("LOCAL_HOLD -> ACTIVE failed");
+                } else {
+                    session->state.current = session->state.new;
+                }
+                break;
+
+            default:
+                ALOGV("%s: CALL_ACTIVE cannot be handled in state=%d vsid:%x",
+                      __func__, session->state.current, session->vsid);
+                break;
+            }
+            break;
+
+        case CALL_INACTIVE:
+            switch(session->state.current)
+            {
+            case CALL_ACTIVE:
+            case CALL_HOLD:
+            case CALL_LOCAL_HOLD:
+                ALOGD("%s: ACTIVE/HOLD/LOCAL_HOLD -> INACTIVE vsid:%x", __func__, session->vsid);
+                ret = stop_call(adev, usecase_id);
+                if(ret < 0) {
+                    ALOGE("%s: voice_end_call() failed for usecase: %d\n",
+                          __func__, usecase_id);
+                } else {
+                    voice_extn_is_in_call(adev, &is_in_call);
+                    if (!is_in_call) {
+                        adev->voice.voice_device_set = false;
+                    }
+                    session->state.current = session->state.new;
+                }
+                break;
+
+            default:
+                ALOGV("%s: CALL_INACTIVE cannot be handled in state=%d vsid:%x",
+                      __func__, session->state.current, session->vsid);
+                break;
+            }
+            break;
+
+        case CALL_HOLD:
+            switch(session->state.current)
+            {
+            case CALL_ACTIVE:
+                ALOGD("%s: CALL_ACTIVE -> HOLD vsid:%x", __func__, session->vsid);
+                session->state.current = session->state.new;
+                break;
+
+            case CALL_LOCAL_HOLD:
+                ALOGD("%s: CALL_LOCAL_HOLD -> HOLD vsid:%x", __func__, session->vsid);
+                lch_mode = VOICE_LCH_STOP;
+                if (pcm_ioctl(session->pcm_tx, SNDRV_VOICE_IOCTL_LCH, &lch_mode) < 0) {
+                    ALOGE("LOCAL_HOLD -> HOLD failed");
+                } else {
+                    session->state.current = session->state.new;
+                }
+                break;
+
+            default:
+                ALOGV("%s: CALL_HOLD cannot be handled in state=%d vsid:%x",
+                      __func__, session->state.current, session->vsid);
+                break;
+            }
+            break;
+
+        case CALL_LOCAL_HOLD:
+            switch(session->state.current)
+            {
+            case CALL_ACTIVE:
+            case CALL_HOLD:
+                ALOGD("%s: ACTIVE/CALL_HOLD -> LOCAL_HOLD vsid:%x", __func__,
+                      session->vsid);
+                lch_mode = VOICE_LCH_START;
+                if (pcm_ioctl(session->pcm_tx, SNDRV_VOICE_IOCTL_LCH, &lch_mode) < 0) {
+                    ALOGE("LOCAL_HOLD -> HOLD failed");
+                } else {
+                    session->state.current = session->state.new;
+                }
+                break;
+
+            default:
+                ALOGV("%s: CALL_LOCAL_HOLD cannot be handled in state=%d vsid:%x",
+                      __func__, session->state.current, session->vsid);
+                break;
+            }
+            break;
+
+        default:
+            break;
+        } //end out switch loop
+    } //end for loop
+
+    return ret;
+}
+
+static int update_call_states(struct audio_device *adev,
+                                    const uint32_t vsid, const int call_state)
+{
+    struct voice_session *session = NULL;
+    int i = 0;
+    bool is_in_call;
+    int no_of_calls_active = 0;
+
+    for (i = 0; i < MAX_VOICE_SESSIONS; i++) {
+        if (vsid == adev->voice.session[i].vsid) {
+            session = &adev->voice.session[i];
+            break;
+        }
+    }
+
+    for (i = 0; i < MAX_VOICE_SESSIONS; i++) {
+        if (CALL_INACTIVE != adev->voice.session[i].state.current)
+            no_of_calls_active++;
+    }
+
+    if (session) {
+        session->state.new = call_state;
+        voice_extn_is_in_call(adev, &is_in_call);
+        ALOGD("%s is_in_call:%d voice_device_set:%d, mode:%d\n",
+              __func__, is_in_call, adev->voice.voice_device_set, adev->mode);
+        /* Dont start voice call before device routing for voice usescases has
+         * occured, otherwise voice calls will be started unintendedly on
+         * speaker.
+         */
+        if (is_in_call || adev->voice.voice_device_set) {
+            /* Device routing is not triggered for voice calls on the subsequent
+             * subs, Hence update the call states if voice call is already
+             * active on other sub.
+             */
+            update_calls(adev);
+        }
+    } else {
+        return -EINVAL;
+    }
+
+    return 0;
+
+}
+
+int voice_extn_get_active_session_id(struct audio_device *adev,
+                                     uint32_t *session_id)
+{
+    *session_id = get_session_id_with_state(adev, CALL_ACTIVE);
+    return 0;
+}
+
+int voice_extn_is_in_call(struct audio_device *adev, bool *in_call)
+{
+    struct voice_session *session = NULL;
+    int i = 0;
+    *in_call = false;
+
+    for (i = 0; i < MAX_VOICE_SESSIONS; i++) {
+        session = &adev->voice.session[i];
+        if(session->state.current != CALL_INACTIVE){
+            *in_call = true;
+            break;
+        }
+    }
+
+    return 0;
+}
+
+int voice_extn_is_in_call_rec_stream(struct stream_in *in, bool *in_call_rec)
+{
+    *in_call_rec = false;
+
+    if(in->source == AUDIO_SOURCE_VOICE_DOWNLINK ||
+       in->source == AUDIO_SOURCE_VOICE_UPLINK ||
+       in->source == AUDIO_SOURCE_VOICE_CALL) {
+       *in_call_rec = true;
+    }
+
+    return 0;
+}
+
+void voice_extn_init(struct audio_device *adev)
+{
+    adev->voice.session[VOICE_SESS_IDX].vsid =  VOICE_VSID;
+    adev->voice.session[VOICE2_SESS_IDX].vsid = VOICE2_VSID;
+    adev->voice.session[VOLTE_SESS_IDX].vsid =  VOLTE_VSID;
+    adev->voice.session[QCHAT_SESS_IDX].vsid =  QCHAT_VSID;
+    adev->voice.session[VOWLAN_SESS_IDX].vsid = VOWLAN_VSID;
+}
+
+int voice_extn_get_session_from_use_case(struct audio_device *adev,
+                                         const audio_usecase_t usecase_id,
+                                         struct voice_session **session)
+{
+
+    switch(usecase_id)
+    {
+    case USECASE_VOICE_CALL:
+        *session = &adev->voice.session[VOICE_SESS_IDX];
+        break;
+
+    case USECASE_VOICE2_CALL:
+        *session = &adev->voice.session[VOICE2_SESS_IDX];
+        break;
+
+    case USECASE_VOLTE_CALL:
+        *session = &adev->voice.session[VOLTE_SESS_IDX];
+        break;
+
+    case USECASE_QCHAT_CALL:
+        *session = &adev->voice.session[QCHAT_SESS_IDX];
+        break;
+
+    case USECASE_VOWLAN_CALL:
+        *session = &adev->voice.session[VOWLAN_SESS_IDX];
+        break;
+
+    default:
+        ALOGE("%s: Invalid usecase_id:%d\n", __func__, usecase_id);
+        *session = NULL;
+        return -EINVAL;
+    }
+
+    return 0;
+}
+
+int voice_extn_start_call(struct audio_device *adev)
+{
+    /* Start voice calls on sessions whose call state has been
+     * udpated.
+     */
+    ALOGV("%s: enter:", __func__);
+    adev->voice.voice_device_set = true;
+    return update_calls(adev);
+}
+
+int voice_extn_stop_call(struct audio_device *adev)
+{
+    int i;
+    int ret = 0;
+
+    ALOGV("%s: enter:", __func__);
+
+    /* If BT device is enabled and voice calls are ended, telephony will call
+     * set_mode(AUDIO_MODE_NORMAL) which will trigger audio policy manager to
+     * set routing with device BT A2DP profile. Hence end all voice calls when
+     * set_mode(AUDIO_MODE_NORMAL) before BT A2DP profile is selected.
+     */
+    if (adev->mode == AUDIO_MODE_NORMAL) {
+        ALOGD("%s: end all calls", __func__);
+        for (i = 0; i < MAX_VOICE_SESSIONS; i++) {
+            adev->voice.session[i].state.new = CALL_INACTIVE;
+        }
+
+        ret = update_calls(adev);
+    }
+
+    return ret;
+}
+
+int voice_extn_set_parameters(struct audio_device *adev,
+                              struct str_parms *parms)
+{
+    char *str;
+    int value;
+    int ret = 0, err;
+    char *kv_pairs = str_parms_to_str(parms);
+    char str_value[256] = {0};
+
+    ALOGV_IF(kv_pairs != NULL, "%s: enter: %s", __func__, kv_pairs);
+
+    err = str_parms_get_int(parms, AUDIO_PARAMETER_KEY_VSID, &value);
+    if (err >= 0) {
+        str_parms_del(parms, AUDIO_PARAMETER_KEY_VSID);
+        uint32_t vsid = value;
+        int call_state = -1;
+        err = str_parms_get_int(parms, AUDIO_PARAMETER_KEY_CALL_STATE, &value);
+        if (err >= 0) {
+            call_state = value;
+        } else {
+            ALOGE("%s: call_state key not found", __func__);
+            ret = -EINVAL;
+            goto done;
+        }
+
+        if (is_valid_vsid(vsid) && is_valid_call_state(call_state)) {
+            ret = update_call_states(adev, vsid, call_state);
+        } else {
+            ALOGE("%s: invalid vsid:%x or call_state:%d",
+                  __func__, vsid, call_state);
+            ret = -EINVAL;
+            goto done;
+        }
+    }
+
+    err = str_parms_get_str(parms, AUDIO_PARAMETER_KEY_DEVICE_MUTE, str_value,
+                            sizeof(str_value));
+    if (err >= 0) {
+        str_parms_del(parms, AUDIO_PARAMETER_KEY_DEVICE_MUTE);
+        bool mute = false;
+
+        if (!strncmp("true", str_value, sizeof("true"))) {
+            mute = true;
+        }
+
+        err = str_parms_get_str(parms, AUDIO_PARAMETER_KEY_DIRECTION, str_value,
+                                sizeof(str_value));
+        if (err >= 0) {
+            str_parms_del(parms, AUDIO_PARAMETER_KEY_DIRECTION);
+        } else {
+            ALOGE("%s: direction key not found", __func__);
+            ret = -EINVAL;
+            goto done;
+        }
+
+        ret = platform_set_device_mute(adev->platform, mute, str_value);
+        if (ret != 0) {
+            ALOGE("%s: Failed to set mute err:%d", __func__, ret);
+            ret = -EINVAL;
+            goto done;
+        }
+    }
+
+done:
+    ALOGV("%s: exit with code(%d)", __func__, ret);
+    free(kv_pairs);
+    return ret;
+}
+
+static int get_all_call_states_str(const struct audio_device *adev,
+                            char *value)
+{
+    int ret = 0;
+    char *cur_ptr = value;
+    int i, len=0;
+
+    for (i = 0; i < MAX_VOICE_SESSIONS; i++) {
+        snprintf(cur_ptr, VOICE_EXTN_PARAMETER_VALUE_MAX_LEN - len,
+                 "%d:%d,",adev->voice.session[i].vsid,
+                 adev->voice.session[i].state.current);
+        len = strlen(cur_ptr);
+        cur_ptr = cur_ptr + len;
+    }
+    ALOGV("%s:value=%s", __func__, value);
+    return ret;
+}
+
+void voice_extn_get_parameters(const struct audio_device *adev,
+                               struct str_parms *query,
+                               struct str_parms *reply)
+{
+    int ret;
+    char value[VOICE_EXTN_PARAMETER_VALUE_MAX_LEN] = {0};
+    char *str = str_parms_to_str(query);
+
+    ALOGV_IF(str != NULL, "%s: enter %s", __func__, str);
+    free(str);
+
+    ret = str_parms_get_str(query, AUDIO_PARAMETER_KEY_AUDIO_MODE, value,
+                            sizeof(value));
+    if (ret >= 0) {
+        str_parms_add_int(reply, AUDIO_PARAMETER_KEY_AUDIO_MODE, adev->mode);
+    }
+
+    ret = str_parms_get_str(query, AUDIO_PARAMETER_KEY_ALL_CALL_STATES,
+                            value, sizeof(value));
+    if (ret >= 0) {
+        ret = get_all_call_states_str(adev, value);
+        if (ret) {
+            ALOGE("%s: Error fetching call states, err:%d", __func__, ret);
+            return;
+        }
+        str_parms_add_str(reply, AUDIO_PARAMETER_KEY_ALL_CALL_STATES, value);
+    }
+
+    str = str_parms_to_str(reply);
+    ALOGV_IF(str != NULL, "%s: exit: returns \"%s\"", __func__, str);
+    free(str);
+}
+
+#ifdef INCALL_MUSIC_ENABLED
+int voice_extn_check_and_set_incall_music_usecase(struct audio_device *adev,
+                                                  struct stream_out *out)
+{
+    uint32_t session_id = 0;
+
+    session_id = get_session_id_with_state(adev, CALL_LOCAL_HOLD);
+    if (session_id == VOICE_VSID) {
+        out->usecase = USECASE_INCALL_MUSIC_UPLINK;
+    } else if (session_id == VOICE2_VSID) {
+        out->usecase = USECASE_INCALL_MUSIC_UPLINK2;
+    } else {
+        ALOGE("%s: Invalid session id %x", __func__, session_id);
+        return -EINVAL;
+    }
+
+    out->config = pcm_config_incall_music;
+    out->supported_channel_masks[0] = AUDIO_CHANNEL_OUT_MONO;
+    out->channel_mask = AUDIO_CHANNEL_OUT_MONO;
+
+    return 0;
+}
+#endif
+
diff --git a/hal/voice_extn/voice_extn.h b/hal/voice_extn/voice_extn.h
new file mode 100644
index 0000000..fcc16ec
--- /dev/null
+++ b/hal/voice_extn/voice_extn.h
@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2014 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 VOICE_EXTN_H
+#define VOICE_EXTN_H
+
+#ifdef MULTI_VOICE_SESSION_ENABLED
+int voice_extn_start_call(struct audio_device *adev);
+int voice_extn_stop_call(struct audio_device *adev);
+int voice_extn_get_session_from_use_case(struct audio_device *adev,
+                                         const audio_usecase_t usecase_id,
+                                         struct voice_session **session);
+void voice_extn_init(struct audio_device *adev);
+int voice_extn_set_parameters(struct audio_device *adev,
+                              struct str_parms *parms);
+void voice_extn_get_parameters(const struct audio_device *adev,
+                               struct str_parms *query,
+                               struct str_parms *reply);
+int voice_extn_is_in_call(struct audio_device *adev, bool *in_call);
+int voice_extn_is_in_call_rec_stream(struct stream_in *in, bool *in_call_rec);
+int voice_extn_get_active_session_id(struct audio_device *adev,
+                                     uint32_t *session_id);
+#else
+static int voice_extn_start_call(struct audio_device *adev __unused)
+{
+    return -ENOSYS;
+}
+
+static int voice_extn_stop_call(struct audio_device *adev __unused)
+{
+    return -ENOSYS;
+}
+
+static int voice_extn_get_session_from_use_case(struct audio_device *adev __unused,
+                                                const audio_usecase_t usecase_id __unused,
+                                                struct voice_session **session __unused)
+{
+    return -ENOSYS;
+}
+
+static void voice_extn_init(struct audio_device *adev __unused)
+{
+}
+
+static int voice_extn_set_parameters(struct audio_device *adev __unused,
+                                     struct str_parms *parms __unused)
+{
+    return -ENOSYS;
+}
+
+static void voice_extn_get_parameters(const struct audio_device *adev __unused,
+                                      struct str_parms *query __unused,
+                                      struct str_parms *reply __unused)
+{
+}
+
+static int voice_extn_is_in_call(struct audio_device *adev __unused, bool *in_call __unused)
+{
+    return -ENOSYS;
+}
+
+static int voice_extn_is_in_call_rec_stream(struct stream_in *in __unused, bool *in_call_rec __unused)
+{
+    return -ENOSYS;
+}
+
+static int voice_extn_get_active_session_id(struct audio_device *adev __unused,
+                                            uint32_t *session_id __unused)
+{
+    return -ENOSYS;
+}
+
+#endif
+
+#ifdef INCALL_MUSIC_ENABLED
+int voice_extn_check_and_set_incall_music_usecase(struct audio_device *adev,
+                                                  struct stream_out *out);
+#else
+static int voice_extn_check_and_set_incall_music_usecase(struct audio_device *adev __unused,
+                                                         struct stream_out *out __unused)
+{
+    return -ENOSYS;
+}
+#endif
+
+#endif //VOICE_EXTN_H