diff --git a/hal/Android.mk b/hal/Android.mk
index 6db1f98..1973178 100644
--- a/hal/Android.mk
+++ b/hal/Android.mk
@@ -69,6 +69,10 @@
     LOCAL_CFLAGS += -DANC_HEADSET_ENABLED
 endif
 
+ifeq ($(strip $(AUDIO_FEATURE_ENABLED_VBAT_MONITOR)),true)
+    LOCAL_CFLAGS += -DVBAT_MONITOR_ENABLED
+endif
+
 ifeq ($(strip $(AUDIO_FEATURE_ENABLED_FLUENCE)),true)
     LOCAL_CFLAGS += -DFLUENCE_ENABLED
 endif
diff --git a/hal/audio_extn/audio_extn.c b/hal/audio_extn/audio_extn.c
index 67d30ca..34da4fe 100644
--- a/hal/audio_extn/audio_extn.c
+++ b/hal/audio_extn/audio_extn.c
@@ -62,6 +62,7 @@
     bool custom_stereo_enabled;
     uint32_t proxy_channel_num;
     bool hpx_enabled;
+    bool vbat_enabled;
 };
 
 static struct audio_extn_module aextnmod = {
@@ -70,6 +71,7 @@
     .custom_stereo_enabled = 0,
     .proxy_channel_num = 2,
     .hpx_enabled = 0,
+    .vbat_enabled = 0,
 };
 
 #define AUDIO_PARAMETER_KEY_ANC        "anc_enabled"
@@ -216,6 +218,27 @@
 }
 #endif
 
+#ifdef VBAT_MONITOR_ENABLED
+bool audio_extn_is_vbat_enabled(void)
+{
+    ALOGD("%s: status: %d", __func__, aextnmod.vbat_enabled);
+    return (aextnmod.vbat_enabled ? true: false);
+}
+
+bool audio_extn_can_use_vbat(void)
+{
+    char prop_vbat_enabled[PROPERTY_VALUE_MAX] = "false";
+
+    property_get("persist.audio.vbat.enabled", prop_vbat_enabled, "0");
+    if (!strncmp("true", prop_vbat_enabled, 4)) {
+        aextnmod.vbat_enabled = 1;
+    }
+
+    ALOGD("%s: vbat.enabled property is set to %s", __func__, prop_vbat_enabled);
+    return (aextnmod.vbat_enabled ? true: false);
+}
+#endif
+
 #ifndef ANC_HEADSET_ENABLED
 #define audio_extn_set_anc_parameters(adev, parms)       (0)
 #else
diff --git a/hal/audio_extn/audio_extn.h b/hal/audio_extn/audio_extn.h
index 2bf19fc..ab3e373 100644
--- a/hal/audio_extn/audio_extn.h
+++ b/hal/audio_extn/audio_extn.h
@@ -127,6 +127,14 @@
 bool audio_extn_should_use_handset_anc(int in_channels);
 #endif
 
+#ifndef VBAT_MONITOR_ENABLED
+#define audio_extn_is_vbat_enabled()                     (0)
+#define audio_extn_can_use_vbat()                        (0)
+#else
+bool audio_extn_is_vbat_enabled(void);
+bool audio_extn_can_use_vbat(void);
+#endif
+
 #ifndef FLUENCE_ENABLED
 #define audio_extn_set_fluence_parameters(adev, parms) (0)
 #define audio_extn_get_fluence_parameters(adev, query, reply) (0)
diff --git a/hal/audio_extn/spkr_protection.c b/hal/audio_extn/spkr_protection.c
index 78a7956..c5c757b 100644
--- a/hal/audio_extn/spkr_protection.c
+++ b/hal/audio_extn/spkr_protection.c
@@ -467,10 +467,16 @@
     uc_info_rx->type = PCM_PLAYBACK;
     uc_info_rx->in_snd_device = SND_DEVICE_NONE;
     uc_info_rx->stream.out = adev->primary_output;
-    uc_info_rx->out_snd_device = SND_DEVICE_OUT_SPEAKER_PROTECTED;
+    if (audio_extn_is_vbat_enabled())
+        uc_info_rx->out_snd_device = SND_DEVICE_OUT_SPEAKER_PROTECTED_VBAT;
+    else
+        uc_info_rx->out_snd_device = SND_DEVICE_OUT_SPEAKER_PROTECTED;
     disable_rx = true;
     list_add_tail(&adev->usecase_list, &uc_info_rx->list);
-    enable_snd_device(adev, SND_DEVICE_OUT_SPEAKER_PROTECTED);
+    if (audio_extn_is_vbat_enabled())
+         enable_snd_device(adev, SND_DEVICE_OUT_SPEAKER_PROTECTED_VBAT);
+    else
+         enable_snd_device(adev, SND_DEVICE_OUT_SPEAKER_PROTECTED);
     enable_audio_route(adev, uc_info_rx);
 
     pcm_dev_rx_id = platform_get_pcm_device_id(uc_info_rx->id, PCM_PLAYBACK);
@@ -629,7 +635,10 @@
         }
         if (disable_rx) {
             list_remove(&uc_info_rx->list);
-            disable_snd_device(adev, SND_DEVICE_OUT_SPEAKER_PROTECTED);
+            if (audio_extn_is_vbat_enabled())
+                disable_snd_device(adev, SND_DEVICE_OUT_SPEAKER_PROTECTED_VBAT);
+            else
+                disable_snd_device(adev, SND_DEVICE_OUT_SPEAKER_PROTECTED);
             disable_audio_route(adev, uc_info_rx);
         }
         if (disable_tx) {
@@ -1075,6 +1084,12 @@
     case SND_DEVICE_OUT_VOICE_SPEAKER:
         acdb_id = platform_get_snd_device_acdb_id(SND_DEVICE_OUT_VOICE_SPEAKER_PROTECTED);
         break;
+    case SND_DEVICE_OUT_SPEAKER_VBAT:
+        acdb_id = platform_get_snd_device_acdb_id(SND_DEVICE_OUT_SPEAKER_PROTECTED_VBAT);
+        break;
+    case SND_DEVICE_OUT_VOICE_SPEAKER_VBAT:
+        acdb_id = platform_get_snd_device_acdb_id(SND_DEVICE_OUT_VOICE_SPEAKER_PROTECTED_VBAT);
+        break;
     default:
         acdb_id = -EINVAL;
         break;
@@ -1092,6 +1107,10 @@
         return SND_DEVICE_OUT_SPEAKER_PROTECTED;
     case SND_DEVICE_OUT_VOICE_SPEAKER:
         return SND_DEVICE_OUT_VOICE_SPEAKER_PROTECTED;
+    case SND_DEVICE_OUT_SPEAKER_VBAT:
+        return SND_DEVICE_OUT_SPEAKER_PROTECTED_VBAT;
+    case SND_DEVICE_OUT_VOICE_SPEAKER_VBAT:
+        return SND_DEVICE_OUT_VOICE_SPEAKER_PROTECTED_VBAT;
     default:
         return snd_device;
     }
diff --git a/hal/audio_hw.c b/hal/audio_hw.c
index 4357d8d..367ba4c 100644
--- a/hal/audio_hw.c
+++ b/hal/audio_hw.c
@@ -456,7 +456,7 @@
     audio_extn_utils_send_audio_calibration(adev, usecase);
     audio_extn_utils_send_app_type_cfg(usecase);
     strcpy(mixer_path, use_case_table[usecase->id]);
-    platform_add_backend_name(mixer_path, snd_device);
+    platform_add_backend_name(mixer_path, snd_device, usecase);
     ALOGV("%s: apply mixer and update path: %s", __func__, mixer_path);
     audio_route_apply_and_update_path(adev->audio_route, mixer_path);
     ALOGV("%s: exit", __func__);
@@ -478,7 +478,7 @@
     else
         snd_device = usecase->out_snd_device;
     strcpy(mixer_path, use_case_table[usecase->id]);
-    platform_add_backend_name(mixer_path, snd_device);
+    platform_add_backend_name(mixer_path, snd_device, usecase);
     ALOGV("%s: reset and update mixer path: %s", __func__, mixer_path);
     audio_route_reset_and_update_path(adev->audio_route, mixer_path);
     audio_extn_sound_trigger_update_stream_status(usecase, ST_EVENT_STREAM_FREE);
@@ -522,8 +522,10 @@
        audio_extn_usb_start_capture(adev);
 
     if ((snd_device == SND_DEVICE_OUT_SPEAKER ||
-        snd_device == SND_DEVICE_OUT_VOICE_SPEAKER) &&
-        audio_extn_spkr_prot_is_enabled()) {
+         snd_device == SND_DEVICE_OUT_SPEAKER_VBAT ||
+         snd_device == SND_DEVICE_OUT_VOICE_SPEAKER_VBAT ||
+         snd_device == SND_DEVICE_OUT_VOICE_SPEAKER) &&
+         audio_extn_spkr_prot_is_enabled()) {
        if (audio_extn_spkr_prot_get_acdb_id(snd_device) < 0) {
            adev->snd_dev_ref_cnt[snd_device]--;
            return -EINVAL;
@@ -592,8 +594,10 @@
             audio_extn_usb_stop_capture();
 
         if ((snd_device == SND_DEVICE_OUT_SPEAKER ||
-            snd_device == SND_DEVICE_OUT_VOICE_SPEAKER) &&
-            audio_extn_spkr_prot_is_enabled()) {
+             snd_device == SND_DEVICE_OUT_SPEAKER_VBAT ||
+             snd_device == SND_DEVICE_OUT_VOICE_SPEAKER_VBAT ||
+             snd_device == SND_DEVICE_OUT_VOICE_SPEAKER) &&
+             audio_extn_spkr_prot_is_enabled()) {
             audio_extn_spkr_prot_stop_processing(snd_device);
         } else {
             audio_route_reset_and_update_path(adev->audio_route, device_name);
@@ -3431,6 +3435,7 @@
         if ((mode == AUDIO_MODE_NORMAL || mode == AUDIO_MODE_IN_COMMUNICATION) &&
                 voice_is_in_call(adev)) {
             voice_stop_call(adev);
+            platform_set_gsm_mode(adev->platform, false);
             adev->current_call_output = NULL;
         }
     }
diff --git a/hal/msm8916/platform.c b/hal/msm8916/platform.c
index 2303e9d..aaca0b2 100644
--- a/hal/msm8916/platform.c
+++ b/hal/msm8916/platform.c
@@ -133,6 +133,7 @@
 char cal_name_info[WCD9XXX_MAX_CAL][MAX_CAL_NAME] = {
         [WCD9XXX_ANC_CAL] = "anc_cal",
         [WCD9XXX_MBHC_CAL] = "mbhc_cal",
+        [WCD9XXX_VBAT_CAL] = "vbat_cal",
 };
 
 #define AUDIO_PARAMETER_KEY_REC_PLAY_CONC "rec_play_conc_on"
@@ -173,6 +174,7 @@
 typedef int (*acdb_set_audio_cal_t) (void *, void *, uint32_t);
 typedef int (*acdb_get_audio_cal_t) (void *, void *, uint32_t*);
 typedef int (*acdb_send_common_top_t) (void);
+typedef int (*acdb_set_codec_data_t) (void *, char *);
 
 typedef struct codec_backend_cfg {
     uint32_t sample_rate;
@@ -205,6 +207,9 @@
     bool ec_ref_enabled;
     bool is_wsa_speaker;
     bool is_acdb_initialized;
+    /* Vbat monitor related flags */
+    bool is_vbat_speaker;
+    bool gsm_mode_enabled;
     /* Audio calibration related functions */
     void                       *acdb_handle;
     int                        voice_feature_set;
@@ -217,6 +222,7 @@
     acdb_reload_vocvoltable_t  acdb_reload_vocvoltable;
     acdb_get_default_app_type_t acdb_get_default_app_type;
     acdb_send_common_top_t     acdb_send_common_top;
+    acdb_set_codec_data_t      acdb_set_codec_data;
 #ifdef RECORD_PLAY_CONCURRENCY
     bool rec_play_conc_set;
 #endif
@@ -309,6 +315,7 @@
     [SND_DEVICE_OUT_SPEAKER_EXTERNAL_1] = "speaker-ext-1",
     [SND_DEVICE_OUT_SPEAKER_EXTERNAL_2] = "speaker-ext-2",
     [SND_DEVICE_OUT_SPEAKER_WSA] = "wsa-speaker",
+    [SND_DEVICE_OUT_SPEAKER_VBAT] = "vbat-speaker",
     [SND_DEVICE_OUT_SPEAKER_REVERSE] = "speaker-reverse",
     [SND_DEVICE_OUT_HEADPHONES] = "headphones",
     [SND_DEVICE_OUT_HEADPHONES_44_1] = "headphones-44.1",
@@ -318,6 +325,7 @@
     [SND_DEVICE_OUT_VOICE_HANDSET] = "voice-handset",
     [SND_DEVICE_OUT_VOICE_SPEAKER] = "voice-speaker",
     [SND_DEVICE_OUT_VOICE_SPEAKER_WSA] = "wsa-voice-speaker",
+    [SND_DEVICE_OUT_VOICE_SPEAKER_VBAT] = "vbat-voice-speaker",
     [SND_DEVICE_OUT_VOICE_HEADPHONES] = "voice-headphones",
     [SND_DEVICE_OUT_HDMI] = "hdmi",
     [SND_DEVICE_OUT_SPEAKER_AND_HDMI] = "speaker-and-hdmi",
@@ -339,6 +347,8 @@
     [SND_DEVICE_OUT_ANC_HANDSET] = "anc-handset",
     [SND_DEVICE_OUT_SPEAKER_PROTECTED] = "speaker-protected",
     [SND_DEVICE_OUT_VOICE_SPEAKER_PROTECTED] = "voice-speaker-protected",
+    [SND_DEVICE_OUT_SPEAKER_PROTECTED_VBAT] = "speaker-protected-vbat",
+    [SND_DEVICE_OUT_VOICE_SPEAKER_PROTECTED_VBAT] = "voice-speaker-protected-vbat",
 #ifdef RECORD_PLAY_CONCURRENCY
     [SND_DEVICE_OUT_VOIP_HANDSET] = "voip-handset",
     [SND_DEVICE_OUT_VOIP_SPEAKER] = "voip-speaker",
@@ -414,6 +424,7 @@
     [SND_DEVICE_OUT_SPEAKER_EXTERNAL_1] = 14,
     [SND_DEVICE_OUT_SPEAKER_EXTERNAL_2] = 14,
     [SND_DEVICE_OUT_SPEAKER_WSA] = 135,
+    [SND_DEVICE_OUT_SPEAKER_VBAT] = 135,
     [SND_DEVICE_OUT_SPEAKER_REVERSE] = 14,
     [SND_DEVICE_OUT_HEADPHONES] = 10,
     [SND_DEVICE_OUT_HEADPHONES_44_1] = 10,
@@ -423,6 +434,7 @@
     [SND_DEVICE_OUT_VOICE_HANDSET] = 7,
     [SND_DEVICE_OUT_VOICE_SPEAKER] = 14,
     [SND_DEVICE_OUT_VOICE_SPEAKER_WSA] = 135,
+    [SND_DEVICE_OUT_VOICE_SPEAKER_VBAT] = 135,
     [SND_DEVICE_OUT_VOICE_HEADPHONES] = 10,
     [SND_DEVICE_OUT_HDMI] = 18,
     [SND_DEVICE_OUT_SPEAKER_AND_HDMI] = 14,
@@ -444,6 +456,8 @@
     [SND_DEVICE_OUT_ANC_HANDSET] = 103,
     [SND_DEVICE_OUT_SPEAKER_PROTECTED] = 124,
     [SND_DEVICE_OUT_VOICE_SPEAKER_PROTECTED] = 101,
+    [SND_DEVICE_OUT_SPEAKER_PROTECTED_VBAT] = 124,
+    [SND_DEVICE_OUT_VOICE_SPEAKER_PROTECTED_VBAT] = 101,
 #ifdef RECORD_PLAY_CONCURRENCY
     [SND_DEVICE_OUT_VOIP_HANDSET] = 133,
     [SND_DEVICE_OUT_VOIP_SPEAKER] = 132,
@@ -521,6 +535,7 @@
     {TO_NAME_INDEX(SND_DEVICE_OUT_SPEAKER_EXTERNAL_1)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_SPEAKER_EXTERNAL_2)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_SPEAKER_WSA)},
+    {TO_NAME_INDEX(SND_DEVICE_OUT_SPEAKER_VBAT)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_SPEAKER_REVERSE)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_HEADPHONES)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_HEADPHONES_44_1)},
@@ -530,6 +545,7 @@
     {TO_NAME_INDEX(SND_DEVICE_OUT_VOICE_HANDSET)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_VOICE_SPEAKER)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_VOICE_SPEAKER_WSA)},
+    {TO_NAME_INDEX(SND_DEVICE_OUT_VOICE_SPEAKER_VBAT)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_VOICE_HEADPHONES)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_HDMI)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_SPEAKER_AND_HDMI)},
@@ -551,6 +567,8 @@
     {TO_NAME_INDEX(SND_DEVICE_OUT_ANC_HANDSET)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_SPEAKER_PROTECTED)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_VOICE_SPEAKER_PROTECTED)},
+    {TO_NAME_INDEX(SND_DEVICE_OUT_SPEAKER_PROTECTED_VBAT)},
+    {TO_NAME_INDEX(SND_DEVICE_OUT_VOICE_SPEAKER_PROTECTED_VBAT)},
 #ifdef RECORD_PLAY_CONCURRENCY
     {TO_NAME_INDEX(SND_DEVICE_OUT_VOIP_HANDSET)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_VOIP_SPEAKER)},
@@ -887,6 +905,24 @@
     }
 }
 
+void platform_set_gsm_mode(void *platform, bool enable)
+{
+    struct platform_data *my_data = (struct platform_data *)platform;
+    struct audio_device *adev = my_data->adev;
+
+    if (my_data->gsm_mode_enabled) {
+        my_data->gsm_mode_enabled = false;
+        ALOGV("%s: disabling gsm mode", __func__);
+        audio_route_reset_and_update_path(adev->audio_route, "gsm-mode");
+    }
+
+    if (enable) {
+         my_data->gsm_mode_enabled = true;
+         ALOGD("%s: enabling gsm mode", __func__);
+         audio_route_apply_and_update_path(adev->audio_route, "gsm-mode");
+    }
+}
+
 void platform_set_echo_reference(struct audio_device *adev, bool enable, audio_devices_t out_device)
 {
     struct platform_data *my_data = (struct platform_data *)adev->platform;
@@ -897,20 +933,27 @@
 
     if (strcmp(my_data->ec_ref_mixer_path, "")) {
         ALOGV("%s: disabling %s", __func__, my_data->ec_ref_mixer_path);
-        audio_route_reset_and_update_path(adev->audio_route, my_data->ec_ref_mixer_path);
+        audio_route_reset_and_update_path(adev->audio_route,
+                                          my_data->ec_ref_mixer_path);
     }
 
     if (enable) {
-        strlcpy(my_data->ec_ref_mixer_path, "echo-reference", sizeof(my_data->ec_ref_mixer_path));
         snd_device = platform_get_output_snd_device(adev->platform, &out);
+
         /*
          * If native audio device reference count > 0, then apply codec EC otherwise
-         * fallback to headphones if so or default
+         * fallback to Speakers with VBat if enabled or default
          */
         if (adev->snd_dev_ref_cnt[SND_DEVICE_OUT_HEADPHONES_44_1] > 0)
-            platform_add_backend_name(my_data->ec_ref_mixer_path, SND_DEVICE_OUT_HEADPHONES_44_1);
+            strlcpy(my_data->ec_ref_mixer_path, "echo-reference headphones-44.1",
+                    sizeof(my_data->ec_ref_mixer_path));
+        else if ((snd_device == SND_DEVICE_OUT_SPEAKER_VBAT) ||
+                 (snd_device == SND_DEVICE_OUT_SPEAKER_PROTECTED_VBAT))
+            strlcpy(my_data->ec_ref_mixer_path, "vbat-speaker echo-reference",
+                    sizeof(my_data->ec_ref_mixer_path));
         else
-            platform_add_backend_name(my_data->ec_ref_mixer_path, snd_device);
+            strlcpy(my_data->ec_ref_mixer_path, "echo-reference",
+                    sizeof(my_data->ec_ref_mixer_path));
 
         ALOGD("%s: enabling %s", __func__, my_data->ec_ref_mixer_path);
         audio_route_apply_and_update_path(adev->audio_route, my_data->ec_ref_mixer_path);
@@ -1092,6 +1135,7 @@
     backend_table[SND_DEVICE_IN_CAPTURE_FM] = strdup("capture-fm");
     backend_table[SND_DEVICE_OUT_TRANSMISSION_FM] = strdup("transmission-fm");
     backend_table[SND_DEVICE_OUT_HEADPHONES_44_1] = strdup("headphones-44.1");
+    backend_table[SND_DEVICE_OUT_VOICE_SPEAKER_VBAT] = strdup("vbat-voice-speaker");
 }
 
 void get_cvd_version(char *cvd_version, struct audio_device *adev)
@@ -1147,7 +1191,38 @@
     void   *buff;
 };
 
-static int send_codec_cal(acdb_loader_get_calibration_t acdb_loader_get_calibration, int fd)
+static int send_vbat_adc_data_to_acdb(struct platform_data *plat_data, char *cal_type)
+{
+    int ret = 0;
+    struct mixer_ctl *ctl;
+    uint16_t vbat_adc_data[2];
+    struct platform_data *my_data = plat_data;
+    struct audio_device *adev = my_data->adev;
+
+    const char *mixer_ctl_name = "Vbat ADC data";
+
+    ctl = mixer_get_ctl_by_name(adev->mixer, mixer_ctl_name);
+    if (!ctl) {
+        ALOGE("%s: Could not get ctl for mixer ctl name - %s",
+               __func__, mixer_ctl_name);
+        ret = -EINVAL;
+        goto done;
+    }
+
+    vbat_adc_data[0] = mixer_ctl_get_value(ctl, 0);
+    vbat_adc_data[1] = mixer_ctl_get_value(ctl, 1);
+
+    ALOGD("%s: Vbat ADC output values: Dcp1: %d , Dcp2: %d",
+           __func__, vbat_adc_data[0], vbat_adc_data[1]);
+
+    ret = my_data->acdb_set_codec_data(&vbat_adc_data[0], cal_type);
+
+done:
+    return ret;
+}
+
+static int send_codec_cal(acdb_loader_get_calibration_t acdb_loader_get_calibration,
+                          struct platform_data *plat_data, int fd)
 {
     int ret = 0, type;
 
@@ -1159,6 +1234,12 @@
         if (type == WCD9XXX_MAD_CAL)
             continue;
 
+        if((plat_data->is_vbat_speaker) && (WCD9XXX_VBAT_CAL == type)) {
+           ret = send_vbat_adc_data_to_acdb(plat_data, cal_name_info[type]);
+           if (ret < 0)
+               ALOGE("%s error in sending vbat adc data to acdb", __func__);
+        }
+
         calib.get_size = 1;
         ret = acdb_loader_get_calibration(cal_name_info[type], sizeof(struct param_data),
                                                                  &calib);
@@ -1212,7 +1293,7 @@
            dlerror());
         return;
     }
-    if (send_codec_cal(acdb_loader_get_calibration, fd) < 0)
+    if (send_codec_cal(acdb_loader_get_calibration, plat_data, fd) < 0)
         ALOGE("%s: Could not send anc cal", __FUNCTION__);
 }
 
@@ -1399,6 +1480,12 @@
         acdb_device_table[SND_DEVICE_OUT_SPEAKER_AND_USB_HEADSET] = 131;
     }
 
+    /* Check if Vbat speaker enabled property is set, this should be done before acdb init */
+    bool ret = false;
+    ret = audio_extn_can_use_vbat();
+    if (ret)
+        my_data->is_vbat_speaker = true;
+
     my_data->voice_feature_set = VOICE_FEATURE_SET_DEFAULT;
     my_data->acdb_handle = dlopen(LIB_ACDB_LOADER, RTLD_NOW);
     if (my_data->acdb_handle == NULL) {
@@ -1455,6 +1542,14 @@
             ALOGE("%s: Could not find the symbol acdb_get_default_app_type from %s",
                   __func__, LIB_ACDB_LOADER);
 
+        my_data->acdb_set_codec_data = (acdb_set_codec_data_t)dlsym(
+                                                    my_data->acdb_handle,
+                                                    "acdb_loader_set_codec_data");
+        if (!my_data->acdb_set_codec_data)
+            ALOGE("%s: Could not find the symbol acdb_get_default_app_type from %s",
+                  __func__, LIB_ACDB_LOADER);
+
+
         my_data->acdb_init = (acdb_init_t)dlsym(my_data->acdb_handle,
                                                     "acdb_loader_init_v2");
         if (my_data->acdb_init == NULL) {
@@ -1506,7 +1601,6 @@
     audio_extn_dap_hal_init(adev->snd_card);
 
     audio_extn_dolby_set_license(adev);
-    audio_hwdep_send_cal(my_data);
 
     /* init audio device arbitration */
     audio_extn_dev_arbi_init();
@@ -1614,13 +1708,20 @@
     return 0;
 }
 
-void platform_add_backend_name(char *mixer_path, snd_device_t snd_device)
+void platform_add_backend_name(char *mixer_path, snd_device_t snd_device,
+                               struct audio_usecase *usecase)
 {
     if ((snd_device < SND_DEVICE_MIN) || (snd_device >= SND_DEVICE_MAX)) {
         ALOGE("%s: Invalid snd_device = %d", __func__, snd_device);
         return;
     }
 
+    if((snd_device == SND_DEVICE_OUT_VOICE_SPEAKER_VBAT) &&
+        !(usecase->type == VOICE_CALL || usecase->type == VOIP_CALL)) {
+        ALOGI("%s: Not adding vbat speaker device to non voice use cases", __func__);
+        return;
+    }
+
     const char * suffix = backend_table[snd_device];
 
     if (suffix != NULL) {
@@ -1984,10 +2085,14 @@
     if (my_data->csd == NULL)
         return ret;
 
-    if (out_snd_device == SND_DEVICE_OUT_VOICE_SPEAKER &&
-        audio_extn_spkr_prot_is_enabled())
-        acdb_rx_id = acdb_device_table[SND_DEVICE_OUT_SPEAKER_PROTECTED];
-    else
+    if ((out_snd_device == SND_DEVICE_OUT_VOICE_SPEAKER ||
+         out_snd_device == SND_DEVICE_OUT_VOICE_SPEAKER_VBAT) &&
+         audio_extn_spkr_prot_is_enabled()) {
+        if (my_data->is_vbat_speaker)
+            acdb_rx_id = acdb_device_table[SND_DEVICE_OUT_SPEAKER_PROTECTED_VBAT];
+        else
+            acdb_rx_id = acdb_device_table[SND_DEVICE_OUT_SPEAKER_PROTECTED];
+    } else
         acdb_rx_id = acdb_device_table[out_snd_device];
 
     acdb_tx_id = acdb_device_table[in_snd_device];
@@ -2044,10 +2149,14 @@
     if (my_data->csd == NULL)
         return ret;
 
-    if (out_snd_device == SND_DEVICE_OUT_VOICE_SPEAKER &&
-        audio_extn_spkr_prot_is_enabled())
-        acdb_rx_id = acdb_device_table[SND_DEVICE_OUT_SPEAKER_PROTECTED];
-    else
+    if ((out_snd_device == SND_DEVICE_OUT_VOICE_SPEAKER ||
+         out_snd_device == SND_DEVICE_OUT_VOICE_SPEAKER_VBAT) &&
+         audio_extn_spkr_prot_is_enabled()) {
+        if (my_data->is_vbat_speaker)
+            acdb_rx_id = acdb_device_table[SND_DEVICE_OUT_SPEAKER_PROTECTED_VBAT];
+         else
+            acdb_rx_id = acdb_device_table[SND_DEVICE_OUT_SPEAKER_PROTECTED];
+    } else
         acdb_rx_id = acdb_device_table[out_snd_device];
 
     acdb_tx_id = acdb_device_table[in_snd_device];
@@ -2309,7 +2418,9 @@
             else
                 snd_device = SND_DEVICE_OUT_BT_SCO;
         } else if (devices & AUDIO_DEVICE_OUT_SPEAKER) {
-                if (my_data->is_wsa_speaker)
+                if (my_data->is_vbat_speaker)
+                    snd_device = SND_DEVICE_OUT_VOICE_SPEAKER_VBAT;
+                else if (my_data->is_wsa_speaker)
                     snd_device = SND_DEVICE_OUT_VOICE_SPEAKER_WSA;
                 else
                     snd_device = SND_DEVICE_OUT_VOICE_SPEAKER;
@@ -2370,7 +2481,9 @@
                 snd_device = SND_DEVICE_OUT_SPEAKER_REVERSE;
             else
             {
-                if (my_data->is_wsa_speaker)
+                if (my_data->is_vbat_speaker)
+                    snd_device = SND_DEVICE_OUT_SPEAKER_VBAT;
+                else if (my_data->is_wsa_speaker)
                     snd_device = SND_DEVICE_OUT_SPEAKER_WSA;
                 else
                     snd_device = SND_DEVICE_OUT_SPEAKER;
diff --git a/hal/msm8916/platform.h b/hal/msm8916/platform.h
index 9710147..511d774 100644
--- a/hal/msm8916/platform.h
+++ b/hal/msm8916/platform.h
@@ -72,6 +72,7 @@
     SND_DEVICE_OUT_SPEAKER_EXTERNAL_2,
     SND_DEVICE_OUT_SPEAKER_REVERSE,
     SND_DEVICE_OUT_SPEAKER_WSA,
+    SND_DEVICE_OUT_SPEAKER_VBAT,
     SND_DEVICE_OUT_HEADPHONES,
     SND_DEVICE_OUT_HEADPHONES_44_1,
     SND_DEVICE_OUT_SPEAKER_AND_HEADPHONES,
@@ -80,6 +81,7 @@
     SND_DEVICE_OUT_VOICE_HANDSET,
     SND_DEVICE_OUT_VOICE_SPEAKER,
     SND_DEVICE_OUT_VOICE_SPEAKER_WSA,
+    SND_DEVICE_OUT_VOICE_SPEAKER_VBAT,
     SND_DEVICE_OUT_VOICE_HEADPHONES,
     SND_DEVICE_OUT_HDMI,
     SND_DEVICE_OUT_SPEAKER_AND_HDMI,
@@ -101,6 +103,8 @@
     SND_DEVICE_OUT_ANC_HANDSET,
     SND_DEVICE_OUT_SPEAKER_PROTECTED,
     SND_DEVICE_OUT_VOICE_SPEAKER_PROTECTED,
+    SND_DEVICE_OUT_SPEAKER_PROTECTED_VBAT,
+    SND_DEVICE_OUT_VOICE_SPEAKER_PROTECTED_VBAT,
 #ifdef RECORD_PLAY_CONCURRENCY
     SND_DEVICE_OUT_VOIP_HANDSET,
     SND_DEVICE_OUT_VOIP_SPEAKER,
diff --git a/hal/msm8960/platform.c b/hal/msm8960/platform.c
index 6d2d478..b72cae9 100644
--- a/hal/msm8960/platform.c
+++ b/hal/msm8960/platform.c
@@ -373,7 +373,8 @@
     return 0;
 }
 
-void platform_add_backend_name(char *mixer_path, snd_device_t snd_device)
+void platform_add_backend_name(char *mixer_path, snd_device_t snd_device,
+                               struct audio_usecase *usecase)
 {
     if (snd_device == SND_DEVICE_IN_BT_SCO_MIC)
         strlcat(mixer_path, " bt-sco", MIXER_PATH_MAX_LENGTH);
diff --git a/hal/msm8974/platform.c b/hal/msm8974/platform.c
index 89c8008..5cb18fd 100644
--- a/hal/msm8974/platform.c
+++ b/hal/msm8974/platform.c
@@ -130,6 +130,7 @@
 char cal_name_info[WCD9XXX_MAX_CAL][MAX_CAL_NAME] = {
         [WCD9XXX_ANC_CAL] = "anc_cal",
         [WCD9XXX_MBHC_CAL] = "mbhc_cal",
+        [WCD9XXX_VBAT_CAL] = "vbat_cal",
 };
 
 enum {
@@ -174,6 +175,7 @@
 typedef int (*acdb_set_audio_cal_t) (void *, void *, uint32_t);
 typedef int (*acdb_get_audio_cal_t) (void *, void *, uint32_t*);
 typedef int (*acdb_send_common_top_t) (void);
+typedef int (*acdb_set_codec_data_t) (void *, char *);
 
 typedef struct codec_backend_cfg {
     uint32_t sample_rate;
@@ -206,6 +208,9 @@
     bool ec_ref_enabled;
     bool is_i2s_ext_modem;
     bool is_acdb_initialized;
+    /* Vbat monitor related flags */
+    bool is_vbat_speaker;
+    bool gsm_mode_enabled;
     /* Audio calibration related functions */
     void                       *acdb_handle;
     int                        voice_feature_set;
@@ -218,6 +223,7 @@
     acdb_reload_vocvoltable_t  acdb_reload_vocvoltable;
     acdb_get_default_app_type_t acdb_get_default_app_type;
     acdb_send_common_top_t     acdb_send_common_top;
+    acdb_set_codec_data_t      acdb_set_codec_data;
 
     void *hw_info;
     acdb_send_gain_dep_cal_t   acdb_send_gain_dep_cal;
@@ -314,6 +320,7 @@
     [SND_DEVICE_OUT_SPEAKER] = "speaker",
     [SND_DEVICE_OUT_SPEAKER_EXTERNAL_1] = "speaker-ext-1",
     [SND_DEVICE_OUT_SPEAKER_EXTERNAL_2] = "speaker-ext-2",
+    [SND_DEVICE_OUT_SPEAKER_VBAT] = "speaker-vbat",
     [SND_DEVICE_OUT_SPEAKER_REVERSE] = "speaker-reverse",
     [SND_DEVICE_OUT_HEADPHONES] = "headphones",
     [SND_DEVICE_OUT_HEADPHONES_44_1] = "headphones-44.1",
@@ -322,6 +329,7 @@
     [SND_DEVICE_OUT_SPEAKER_AND_HEADPHONES_EXTERNAL_2] = "speaker-and-headphones-ext-2",
     [SND_DEVICE_OUT_VOICE_HANDSET] = "voice-handset",
     [SND_DEVICE_OUT_VOICE_SPEAKER] = "voice-speaker",
+    [SND_DEVICE_OUT_VOICE_SPEAKER_VBAT] = "voice-speaker-vbat",
     [SND_DEVICE_OUT_VOICE_HEADPHONES] = "voice-headphones",
     [SND_DEVICE_OUT_HDMI] = "hdmi",
     [SND_DEVICE_OUT_SPEAKER_AND_HDMI] = "speaker-and-hdmi",
@@ -343,6 +351,8 @@
     [SND_DEVICE_OUT_ANC_HANDSET] = "anc-handset",
     [SND_DEVICE_OUT_SPEAKER_PROTECTED] = "speaker-protected",
     [SND_DEVICE_OUT_VOICE_SPEAKER_PROTECTED] = "voice-speaker-protected",
+    [SND_DEVICE_OUT_SPEAKER_PROTECTED_VBAT] = "speaker-protected-vbat",
+    [SND_DEVICE_OUT_VOICE_SPEAKER_PROTECTED_VBAT] = "voice-speaker-protected-vbat",
 
     /* Capture sound devices */
     [SND_DEVICE_IN_HANDSET_MIC] = "handset-mic",
@@ -412,6 +422,7 @@
     [SND_DEVICE_OUT_SPEAKER] = 14,
     [SND_DEVICE_OUT_SPEAKER_EXTERNAL_1] = 130,
     [SND_DEVICE_OUT_SPEAKER_EXTERNAL_2] = 130,
+    [SND_DEVICE_OUT_SPEAKER_VBAT] = 14,
     [SND_DEVICE_OUT_SPEAKER_REVERSE] = 14,
     [SND_DEVICE_OUT_HEADPHONES] = 10,
     [SND_DEVICE_OUT_HEADPHONES_44_1] = 10,
@@ -420,6 +431,7 @@
     [SND_DEVICE_OUT_SPEAKER_AND_HEADPHONES_EXTERNAL_2] = 130,
     [SND_DEVICE_OUT_VOICE_HANDSET] = 7,
     [SND_DEVICE_OUT_VOICE_SPEAKER] = 14,
+    [SND_DEVICE_OUT_VOICE_SPEAKER_VBAT] = 14,
     [SND_DEVICE_OUT_VOICE_HEADPHONES] = 10,
     [SND_DEVICE_OUT_HDMI] = 18,
     [SND_DEVICE_OUT_SPEAKER_AND_HDMI] = 14,
@@ -441,6 +453,8 @@
     [SND_DEVICE_OUT_ANC_HANDSET] = 103,
     [SND_DEVICE_OUT_SPEAKER_PROTECTED] = 124,
     [SND_DEVICE_OUT_VOICE_SPEAKER_PROTECTED] = 101,
+    [SND_DEVICE_OUT_SPEAKER_PROTECTED_VBAT] = 124,
+    [SND_DEVICE_OUT_VOICE_SPEAKER_PROTECTED_VBAT] = 101,
 
     [SND_DEVICE_IN_HANDSET_MIC] = 4,
     [SND_DEVICE_IN_HANDSET_MIC_EXTERNAL] = 4,
@@ -512,6 +526,7 @@
     {TO_NAME_INDEX(SND_DEVICE_OUT_SPEAKER)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_SPEAKER_EXTERNAL_1)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_SPEAKER_EXTERNAL_2)},
+    {TO_NAME_INDEX(SND_DEVICE_OUT_SPEAKER_VBAT)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_SPEAKER_REVERSE)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_HEADPHONES)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_HEADPHONES_44_1)},
@@ -520,6 +535,7 @@
     {TO_NAME_INDEX(SND_DEVICE_OUT_SPEAKER_AND_HEADPHONES_EXTERNAL_2)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_VOICE_HANDSET)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_VOICE_SPEAKER)},
+    {TO_NAME_INDEX(SND_DEVICE_OUT_VOICE_SPEAKER_VBAT)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_VOICE_HEADPHONES)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_HDMI)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_SPEAKER_AND_HDMI)},
@@ -540,6 +556,8 @@
     {TO_NAME_INDEX(SND_DEVICE_OUT_ANC_HANDSET)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_SPEAKER_PROTECTED)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_VOICE_SPEAKER_PROTECTED)},
+    {TO_NAME_INDEX(SND_DEVICE_OUT_SPEAKER_PROTECTED_VBAT)},
+    {TO_NAME_INDEX(SND_DEVICE_OUT_VOICE_SPEAKER_PROTECTED_VBAT)},
     {TO_NAME_INDEX(SND_DEVICE_IN_HANDSET_MIC)},
     {TO_NAME_INDEX(SND_DEVICE_IN_HANDSET_MIC_EXTERNAL)},
     {TO_NAME_INDEX(SND_DEVICE_IN_HANDSET_MIC_AEC)},
@@ -771,7 +789,26 @@
     return ret_val;
 }
 
-void platform_set_echo_reference(struct audio_device *adev, bool enable, audio_devices_t out_device)
+void platform_set_gsm_mode(void *platform, bool enable)
+{
+    struct platform_data *my_data = (struct platform_data *)platform;
+    struct audio_device *adev = my_data->adev;
+
+    if (my_data->gsm_mode_enabled) {
+        my_data->gsm_mode_enabled = false;
+        ALOGV("%s: disabling gsm mode", __func__);
+        audio_route_reset_and_update_path(adev->audio_route, "gsm-mode");
+    }
+
+    if (enable) {
+         my_data->gsm_mode_enabled = true;
+         ALOGD("%s: enabling gsm mode", __func__);
+         audio_route_apply_and_update_path(adev->audio_route, "gsm-mode");
+    }
+}
+
+void platform_set_echo_reference(struct audio_device *adev, bool enable,
+                                 audio_devices_t out_device)
 {
     struct platform_data *my_data = (struct platform_data *)adev->platform;
     snd_device_t snd_device = SND_DEVICE_NONE;
@@ -781,20 +818,27 @@
 
     if (strcmp(my_data->ec_ref_mixer_path, "")) {
         ALOGV("%s: disabling %s", __func__, my_data->ec_ref_mixer_path);
-        audio_route_reset_and_update_path(adev->audio_route, my_data->ec_ref_mixer_path);
+        audio_route_reset_and_update_path(adev->audio_route,
+                                          my_data->ec_ref_mixer_path);
     }
 
     if (enable) {
-        strlcpy(my_data->ec_ref_mixer_path, "echo-reference", sizeof(my_data->ec_ref_mixer_path));
         snd_device = platform_get_output_snd_device(adev->platform, &out);
+
         /*
          * If native audio device reference count > 0, then apply codec EC otherwise
-         * fallback to headphones if so or default
+         * fallback to Speakers with VBat if enabled or default
          */
         if (adev->snd_dev_ref_cnt[SND_DEVICE_OUT_HEADPHONES_44_1] > 0)
-            platform_add_backend_name(my_data->ec_ref_mixer_path, SND_DEVICE_OUT_HEADPHONES_44_1);
+            strlcpy(my_data->ec_ref_mixer_path, "echo-reference headphones-44.1",
+                    sizeof(my_data->ec_ref_mixer_path));
+        else if ((snd_device == SND_DEVICE_OUT_SPEAKER_VBAT) ||
+                 (snd_device == SND_DEVICE_OUT_SPEAKER_PROTECTED_VBAT))
+            strlcpy(my_data->ec_ref_mixer_path, "echo-reference speaker-vbat",
+                    sizeof(my_data->ec_ref_mixer_path));
         else
-            platform_add_backend_name(my_data->ec_ref_mixer_path, snd_device);
+            strlcpy(my_data->ec_ref_mixer_path, "echo-reference",
+                    sizeof(my_data->ec_ref_mixer_path));
 
         ALOGD("%s: enabling %s", __func__, my_data->ec_ref_mixer_path);
         audio_route_apply_and_update_path(adev->audio_route, my_data->ec_ref_mixer_path);
@@ -1002,6 +1046,7 @@
     backend_table[SND_DEVICE_OUT_TRANSMISSION_FM] = strdup("transmission-fm");
     backend_table[SND_DEVICE_OUT_HEADPHONES] = strdup("headphones");
     backend_table[SND_DEVICE_OUT_HEADPHONES_44_1] = strdup("headphones-44.1");
+    backend_table[SND_DEVICE_OUT_VOICE_SPEAKER_VBAT] = strdup("voice-speaker-vbat");
 }
 
 void get_cvd_version(char *cvd_version, struct audio_device *adev)
@@ -1057,7 +1102,38 @@
     void   *buff;
 };
 
-static void send_codec_cal(acdb_loader_get_calibration_t acdb_loader_get_calibration, int fd)
+static int send_vbat_adc_data_to_acdb(struct platform_data *plat_data, char *cal_type)
+{
+    int ret = 0;
+    struct mixer_ctl *ctl;
+    uint16_t vbat_adc_data[2];
+    struct platform_data *my_data = plat_data;
+    struct audio_device *adev = my_data->adev;
+
+    const char *mixer_ctl_name = "Vbat ADC data";
+
+    ctl = mixer_get_ctl_by_name(adev->mixer, mixer_ctl_name);
+    if (!ctl) {
+        ALOGE("%s: Could not get ctl for mixer ctl name - %s",
+               __func__, mixer_ctl_name);
+        ret = -EINVAL;
+        goto done;
+    }
+
+    vbat_adc_data[0] = mixer_ctl_get_value(ctl, 0);
+    vbat_adc_data[1] = mixer_ctl_get_value(ctl, 1);
+
+    ALOGD("%s: Vbat ADC output values: Dcp1: %d , Dcp2: %d",
+           __func__, vbat_adc_data[0], vbat_adc_data[1]);
+
+    ret = my_data->acdb_set_codec_data(&vbat_adc_data[0], cal_type);
+
+done:
+    return ret;
+}
+
+static void send_codec_cal(acdb_loader_get_calibration_t acdb_loader_get_calibration,
+                           struct platform_data *plat_data, int fd)
 {
     int type;
 
@@ -1071,6 +1147,13 @@
             continue;
 
         ret = 0;
+
+        if((plat_data->is_vbat_speaker) && (WCD9XXX_VBAT_CAL == type)) {
+           ret = send_vbat_adc_data_to_acdb(plat_data, cal_name_info[type]);
+           if (ret < 0)
+               ALOGE("%s error in sending vbat adc data to acdb", __func__);
+        }
+
         calib.get_size = 1;
         ret = acdb_loader_get_calibration(cal_name_info[type],
                                           sizeof(struct param_data),
@@ -1131,7 +1214,7 @@
         return;
     }
 
-    send_codec_cal(acdb_loader_get_calibration, fd);
+    send_codec_cal(acdb_loader_get_calibration, plat_data, fd);
 }
 
 static int platform_acdb_init(void *platform)
@@ -1171,7 +1254,7 @@
     char baseband[PROPERTY_VALUE_MAX];
     char value[PROPERTY_VALUE_MAX];
     struct platform_data *my_data = NULL;
-    int retry_num = 0, snd_card_num = 0, key = 0, ret = 0;
+    int retry_num = 0, snd_card_num = 0, key = 0;
     const char *snd_card_name;
     char *cvd_version = NULL;
     char *snd_internal_name = NULL;
@@ -1331,6 +1414,12 @@
         }
     }
 
+    /* Check if Vbat speaker enabled property is set, this should be done before acdb init */
+    bool ret = false;
+    ret = audio_extn_can_use_vbat();
+    if (ret)
+        my_data->is_vbat_speaker = true;
+
     my_data->voice_feature_set = VOICE_FEATURE_SET_DEFAULT;
     my_data->acdb_handle = dlopen(LIB_ACDB_LOADER, RTLD_NOW);
     if (my_data->acdb_handle == NULL) {
@@ -1393,6 +1482,14 @@
             ALOGE("%s: Could not find the symbol acdb_get_default_app_type from %s",
                   __func__, LIB_ACDB_LOADER);
 
+        my_data->acdb_set_codec_data = (acdb_set_codec_data_t)dlsym(
+                                                    my_data->acdb_handle,
+                                                    "acdb_loader_set_codec_data");
+        if (!my_data->acdb_set_codec_data)
+            ALOGE("%s: Could not find the symbol acdb_get_default_app_type from %s",
+                  __func__, LIB_ACDB_LOADER);
+
+
         my_data->acdb_init = (acdb_init_t)dlsym(my_data->acdb_handle,
                                                     "acdb_loader_init_v2");
         if (my_data->acdb_init == NULL) {
@@ -1439,7 +1536,6 @@
     audio_extn_spkr_prot_init(adev);
 
     audio_extn_dolby_set_license(adev);
-    audio_hwdep_send_cal(my_data);
 
     /* init audio device arbitration */
     audio_extn_dev_arbi_init();
@@ -1545,13 +1641,20 @@
     return 0;
 }
 
-void platform_add_backend_name(char *mixer_path, snd_device_t snd_device)
+void platform_add_backend_name(char *mixer_path, snd_device_t snd_device,
+                               struct audio_usecase *usecase)
 {
     if ((snd_device < SND_DEVICE_MIN) || (snd_device >= SND_DEVICE_MAX)) {
         ALOGE("%s: Invalid snd_device = %d", __func__, snd_device);
         return;
     }
 
+    if((snd_device == SND_DEVICE_OUT_VOICE_SPEAKER_VBAT) &&
+        !(usecase->type == VOICE_CALL || usecase->type == VOIP_CALL)) {
+        ALOGI("%s: Not adding vbat speaker device to non voice use cases", __func__);
+        return;
+    }
+
     const char * suffix = backend_table[snd_device];
 
     if (suffix != NULL) {
@@ -1905,10 +2008,14 @@
     if (my_data->csd == NULL)
         return ret;
 
-    if (out_snd_device == SND_DEVICE_OUT_VOICE_SPEAKER &&
-        audio_extn_spkr_prot_is_enabled())
-        acdb_rx_id = acdb_device_table[SND_DEVICE_OUT_SPEAKER_PROTECTED];
-    else
+    if ((out_snd_device == SND_DEVICE_OUT_VOICE_SPEAKER ||
+         out_snd_device == SND_DEVICE_OUT_VOICE_SPEAKER_VBAT) &&
+         audio_extn_spkr_prot_is_enabled()) {
+        if (my_data->is_vbat_speaker)
+            acdb_rx_id = acdb_device_table[SND_DEVICE_OUT_SPEAKER_PROTECTED_VBAT];
+        else
+            acdb_rx_id = acdb_device_table[SND_DEVICE_OUT_SPEAKER_PROTECTED];
+    } else
         acdb_rx_id = acdb_device_table[out_snd_device];
 
     acdb_tx_id = acdb_device_table[in_snd_device];
@@ -1965,10 +2072,14 @@
     if (my_data->csd == NULL)
         return ret;
 
-    if (out_snd_device == SND_DEVICE_OUT_VOICE_SPEAKER &&
-        audio_extn_spkr_prot_is_enabled())
-        acdb_rx_id = acdb_device_table[SND_DEVICE_OUT_SPEAKER_PROTECTED];
-    else
+    if ((out_snd_device == SND_DEVICE_OUT_VOICE_SPEAKER ||
+         out_snd_device == SND_DEVICE_OUT_VOICE_SPEAKER_VBAT) &&
+         audio_extn_spkr_prot_is_enabled()) {
+        if (my_data->is_vbat_speaker)
+            acdb_rx_id = acdb_device_table[SND_DEVICE_OUT_SPEAKER_PROTECTED_VBAT];
+         else
+            acdb_rx_id = acdb_device_table[SND_DEVICE_OUT_SPEAKER_PROTECTED];
+    } else
         acdb_rx_id = acdb_device_table[out_snd_device];
 
     acdb_tx_id = acdb_device_table[in_snd_device];
@@ -2227,7 +2338,10 @@
             else
                 snd_device = SND_DEVICE_OUT_BT_SCO;
         } else if (devices & AUDIO_DEVICE_OUT_SPEAKER) {
-            snd_device = SND_DEVICE_OUT_VOICE_SPEAKER;
+                if (my_data->is_vbat_speaker)
+                    snd_device = SND_DEVICE_OUT_VOICE_SPEAKER_VBAT;
+                else
+                    snd_device = SND_DEVICE_OUT_VOICE_SPEAKER;
         } else if (devices & AUDIO_DEVICE_OUT_ANLG_DOCK_HEADSET ||
                    devices & AUDIO_DEVICE_OUT_DGTL_DOCK_HEADSET) {
             snd_device = SND_DEVICE_OUT_USB_HEADSET;
@@ -2266,6 +2380,8 @@
             snd_device = SND_DEVICE_OUT_SPEAKER_EXTERNAL_2;
         else if (adev->speaker_lr_swap)
             snd_device = SND_DEVICE_OUT_SPEAKER_REVERSE;
+        else if (my_data->is_vbat_speaker)
+            snd_device = SND_DEVICE_OUT_SPEAKER_VBAT;
         else
             snd_device = SND_DEVICE_OUT_SPEAKER;
     } else if (devices & AUDIO_DEVICE_OUT_ALL_SCO) {
diff --git a/hal/msm8974/platform.h b/hal/msm8974/platform.h
index d18bd7c..54406b6 100644
--- a/hal/msm8974/platform.h
+++ b/hal/msm8974/platform.h
@@ -69,6 +69,7 @@
     SND_DEVICE_OUT_SPEAKER_EXTERNAL_1,
     SND_DEVICE_OUT_SPEAKER_EXTERNAL_2,
     SND_DEVICE_OUT_SPEAKER_REVERSE,
+    SND_DEVICE_OUT_SPEAKER_VBAT,
     SND_DEVICE_OUT_HEADPHONES,
     SND_DEVICE_OUT_HEADPHONES_44_1,
     SND_DEVICE_OUT_SPEAKER_AND_HEADPHONES,
@@ -76,6 +77,7 @@
     SND_DEVICE_OUT_SPEAKER_AND_HEADPHONES_EXTERNAL_2,
     SND_DEVICE_OUT_VOICE_HANDSET,
     SND_DEVICE_OUT_VOICE_SPEAKER,
+    SND_DEVICE_OUT_VOICE_SPEAKER_VBAT,
     SND_DEVICE_OUT_VOICE_HEADPHONES,
     SND_DEVICE_OUT_HDMI,
     SND_DEVICE_OUT_SPEAKER_AND_HDMI,
@@ -97,6 +99,8 @@
     SND_DEVICE_OUT_ANC_HANDSET,
     SND_DEVICE_OUT_SPEAKER_PROTECTED,
     SND_DEVICE_OUT_VOICE_SPEAKER_PROTECTED,
+    SND_DEVICE_OUT_SPEAKER_PROTECTED_VBAT,
+    SND_DEVICE_OUT_VOICE_SPEAKER_PROTECTED_VBAT,
     SND_DEVICE_OUT_END,
 
     /*
diff --git a/hal/platform_api.h b/hal/platform_api.h
index 516f2d7..3ab5191 100644
--- a/hal/platform_api.h
+++ b/hal/platform_api.h
@@ -29,7 +29,8 @@
 const char *platform_get_snd_device_name(snd_device_t snd_device);
 int platform_get_snd_device_name_extn(void *platform, snd_device_t snd_device,
                                       char *device_name);
-void platform_add_backend_name(char *mixer_path, snd_device_t snd_device);
+void platform_add_backend_name(char *mixer_path, snd_device_t snd_device,
+                               struct audio_usecase *usecase);
 bool platform_send_gain_dep_cal(void *platform, int level);
 int platform_get_pcm_device_id(audio_usecase_t usecase, int device_type);
 int platform_get_snd_device_index(char *snd_device_index_name);
@@ -119,4 +120,5 @@
 int platform_set_device_params(struct stream_out *out, int param, int value);
 int platform_set_audio_device_interface(const char * device_name, const char *intf_name,
                                         const char * codec_type);
+void platform_set_gsm_mode(void *platform, bool enable);
 #endif // AUDIO_PLATFORM_API_H
diff --git a/hal/voice_extn/voice_extn.c b/hal/voice_extn/voice_extn.c
index 960b46e..3cf370d 100644
--- a/hal/voice_extn/voice_extn.c
+++ b/hal/voice_extn/voice_extn.c
@@ -42,6 +42,7 @@
 #define AUDIO_PARAMETER_KEY_DEVICE_MUTE         "device_mute"
 #define AUDIO_PARAMETER_KEY_DIRECTION           "direction"
 #define AUDIO_PARAMETER_KEY_IN_CALL             "in_call"
+#define AUDIO_PARAMETER_KEY_CALL_TYPE           "call_type"
 
 #define VOICE_EXTN_PARAMETER_VALUE_MAX_LEN 256
 
@@ -515,6 +516,20 @@
         }
     }
 
+    err = str_parms_get_str(parms, AUDIO_PARAMETER_KEY_CALL_TYPE, str_value,
+                            sizeof(str_value));
+    if (err >= 0) {
+          str_parms_del(parms, AUDIO_PARAMETER_KEY_CALL_TYPE);
+          ALOGD("%s: call type is %s",__func__,str_value);
+
+           /* Expected call types are CDMA/GSM/WCDMA/LTE/TDSDMA/WLAN/UNKNOWN */
+           if (!strncmp("GSM", str_value, sizeof("GSM"))) {
+               platform_set_gsm_mode(adev->platform, true);
+           } else {
+               platform_set_gsm_mode(adev->platform, false);
+           }
+    }
+
 done:
     ALOGV("%s: exit with code(%d)", __func__, ret);
     free(kv_pairs);