audio: turn off output stages when not in use

The DAC widgets are turned off when not in use in order to
save power. They must not be turned off when the output goes
into standby if a call is in progress.

Change-Id: I3d294a85a86e45c8acc257a8d92b92d7d9b2d4c3

1 files changed, 36 insertions, 15 deletions

diff --git a/audio/audio_hw.c b/audio/audio_hw.c
index 518b62b..b9ccfa1 100644
--- a/audio/audio_hw.c
+++ b/audio/audio_hw.c
@@ -204,7 +204,27 @@ struct route_setting defaults[] = {
         .intval = DB_TO_CAPTURE_VOLUME(30),
     },
 
-    /* speaker */
+    /* headset */
+    {
+        .ctl_name = MIXER_SIDETONE_MIXER_PLAYBACK,
+        .intval = 1,
+    },
+    {
+        .ctl_name = MIXER_DL1_PDM_SWITCH,
+        .intval = 1,
+    },
+
+    /* bt */
+    {
+        .ctl_name = MIXER_BT_UL_VOLUME,
+        .intval = MIXER_ABE_GAIN_0DB,
+    },
+    {
+        .ctl_name = NULL,
+    },
+};
+
+struct route_setting hf_output[] = {
     {
         .ctl_name = MIXER_HF_LEFT_PLAYBACK,
         .strval = MIXER_PLAYBACK_HF_DAC,
@@ -213,16 +233,12 @@ struct route_setting defaults[] = {
         .ctl_name = MIXER_HF_RIGHT_PLAYBACK,
         .strval = MIXER_PLAYBACK_HF_DAC,
     },
-
-    /* headset */
-    {
-        .ctl_name = MIXER_SIDETONE_MIXER_PLAYBACK,
-        .intval = 1,
-    },
     {
-        .ctl_name = MIXER_DL1_PDM_SWITCH,
-        .intval = 1,
+        .ctl_name = NULL,
     },
+};
+
+struct route_setting hs_output[] = {
     {
         .ctl_name = MIXER_HS_LEFT_PLAYBACK,
         .strval = MIXER_PLAYBACK_HS_DAC,
@@ -231,12 +247,6 @@ struct route_setting defaults[] = {
         .ctl_name = MIXER_HS_RIGHT_PLAYBACK,
         .strval = MIXER_PLAYBACK_HS_DAC,
     },
-
-    /* bt */
-    {
-        .ctl_name = MIXER_BT_UL_VOLUME,
-        .intval = MIXER_ABE_GAIN_0DB,
-    },
     {
         .ctl_name = NULL,
     },
@@ -632,6 +642,10 @@ static void select_output_device(struct tuna_audio_device *adev)
     mixer_ctl_set_value(adev->mixer_ctls.dl1_bt, 0, bt_on);
     mixer_ctl_set_value(adev->mixer_ctls.earpiece_enable, 0, earpiece_on);
 
+    /* select output stage */
+    set_route_by_array(adev->mixer, hs_output, headset_on | headphone_on | earpiece_on);
+    set_route_by_array(adev->mixer, hf_output, speaker_on);
+
     /* Special case: select input path if in a call, otherwise
        in_set_parameters is used to update the input route
        todo: use sub mic for handsfree case */
@@ -868,10 +882,17 @@ static int out_set_format(struct audio_stream *stream, int format)
 static int out_standby(struct audio_stream *stream)
 {
     struct tuna_stream_out *out = (struct tuna_stream_out *)stream;
+    struct tuna_audio_device *adev = out->dev;
 
     pthread_mutex_lock(&out->lock);
     if (!out->standby) {
         pcm_close(out->pcm);
+        /* if in call, don't turn off the output stage. This will
+        be done when the call is ended */
+        if (adev->mode != AUDIO_MODE_IN_CALL) {
+            set_route_by_array(adev->mixer, hs_output, 0);
+            set_route_by_array(adev->mixer, hf_output, 0);
+        }
         out->pcm = NULL;
         out->standby = 1;
     }