Add new audiohw capability: POWER_MODE_CAP

This allows the user to make use of the DAC's power-saving abilities.
The two modes are "high performance" and "battery saver". This feature
is supported by the AK4376 DAC in the upcoming FiiO M3K port.

The setting is only a manual toggle right now, but in the future it
could be hooked up to the battery level (via another setting) so it
can be toggled automatically when the battery gets too low.

Change-Id: I482af6e2f969fcbdeb3411bd3ff91f866b12d027

11 files changed, 161 insertions, 0 deletions

diff --git a/apps/lang/english-us.lang b/apps/lang/english-us.lang
index cd7bfe0abf..0dc53e7110 100644
--- a/apps/lang/english-us.lang
+++ b/apps/lang/english-us.lang
@@ -12015,6 +12015,57 @@
   </voice>
 </phrase>
 <phrase>
+  id: LANG_DAC_POWER_MODE
+  desc: in sound settings
+  user: core
+  <source>
+    *: none
+    dac_power_mode: "DAC's power mode"
+  </source>
+  <dest>
+    *: none
+    dac_power_mode: "DAC power mode"
+  </dest>
+  <voice>
+    *: none
+    dac_power_mode: "DAC power mode"
+  </voice>
+</phrase>
+<phrase>
+  id: LANG_DAC_POWER_HIGH
+  desc: in sound settings
+  user: core
+  <source>
+    *: none
+    dac_power_mode: "High performance"
+  </source>
+  <dest>
+    *: none
+    dac_power_mode: "High performance"
+  </dest>
+  <voice>
+    *: none
+    dac_power_mode: "High performance"
+  </voice>
+</phrase>
+<phrase>
+  id: LANG_DAC_POWER_LOW
+  desc: in sound settings
+  user: core
+  <source>
+    *: none
+    dac_power_mode: "Save battery"
+  </source>
+  <dest>
+    *: none
+    dac_power_mode: "Save battery"
+  </dest>
+  <voice>
+    *: none
+    dac_power_mode: "Save battery"
+  </voice>
+</phrase>
+<phrase>
   id: VOICE_BLACK
   desc: spoken only, for announcing chess piece color
   user: core
diff --git a/apps/lang/english.lang b/apps/lang/english.lang
index 8365e9d265..5b8391b859 100644
--- a/apps/lang/english.lang
+++ b/apps/lang/english.lang
@@ -12208,6 +12208,57 @@
   </voice>
 </phrase>
 <phrase>
+  id: LANG_DAC_POWER_MODE
+  desc: in sound settings
+  user: core
+  <source>
+    *: none
+    dac_power_mode: "DAC's power mode"
+  </source>
+  <dest>
+    *: none
+    dac_power_mode: "DAC's power mode"
+  </dest>
+  <voice>
+    *: none
+    dac_power_mode: "DAC's power mode"
+  </voice>
+</phrase>
+<phrase>
+  id: LANG_DAC_POWER_HIGH
+  desc: in sound settings
+  user: core
+  <source>
+    *: none
+    dac_power_mode: "High performance"
+  </source>
+  <dest>
+    *: none
+    dac_power_mode: "High performance"
+  </dest>
+  <voice>
+    *: none
+    dac_power_mode: "High performance"
+  </voice>
+</phrase>
+<phrase>
+  id: LANG_DAC_POWER_LOW
+  desc: in sound settings
+  user: core
+  <source>
+    *: none
+    dac_power_mode: "Save battery"
+  </source>
+  <dest>
+    *: none
+    dac_power_mode: "Save battery"
+  </dest>
+  <voice>
+    *: none
+    dac_power_mode: "Save battery"
+  </voice>
+</phrase>
+<phrase>
   id: LANG_VOLUME_LIMIT
   desc: in sound_settings
   user: core
diff --git a/apps/menus/sound_menu.c b/apps/menus/sound_menu.c
index 174329fcc8..9cbc76e474 100644
--- a/apps/menus/sound_menu.c
+++ b/apps/menus/sound_menu.c
@@ -122,6 +122,10 @@ MENUITEM_SETTING(depth_3d, &global_settings.depth_3d, NULL);
 MENUITEM_SETTING(roll_off, &global_settings.roll_off, NULL);
 #endif
 
+#ifdef AUDIOHW_HAVE_POWER_MODE
+MENUITEM_SETTING(power_mode, &global_settings.power_mode, NULL);
+#endif
+
 #ifdef AUDIOHW_HAVE_FUNCTIONAL_MODE
 MENUITEM_SETTING(func_mode, &global_settings.func_mode, NULL);
 #endif
@@ -240,6 +244,9 @@ MAKE_MENU(sound_settings, ID2P(LANG_SOUND_SETTINGS), NULL, Icon_Audio,
 #ifdef AUDIOHW_HAVE_FILTER_ROLL_OFF
           ,&roll_off
 #endif
+#ifdef AUDIOHW_HAVE_POWER_MODE
+          ,&power_mode
+#endif
 #ifdef AUDIOHW_HAVE_FUNCTIONAL_MODE
           ,&func_mode
 #endif
diff --git a/apps/settings.c b/apps/settings.c
index 43a010aeb2..99cede382b 100644
--- a/apps/settings.c
+++ b/apps/settings.c
@@ -746,6 +746,9 @@ void sound_settings_apply(void)
 #ifdef AUDIOHW_HAVE_FILTER_ROLL_OFF
     sound_set(SOUND_FILTER_ROLL_OFF, global_settings.roll_off);
 #endif
+#ifdef AUDIOHW_HAVE_POWER_MODE
+    sound_set(SOUND_POWER_MODE, global_settings.power_mode);
+#endif
 #ifdef AUDIOHW_HAVE_EQ
     int b;
 
diff --git a/apps/settings.h b/apps/settings.h
index cc60617de4..1ff7bbe5d1 100644
--- a/apps/settings.h
+++ b/apps/settings.h
@@ -782,6 +782,10 @@ struct user_settings
     int roll_off;
 #endif
 
+#ifdef AUDIOHW_HAVE_POWER_MODE
+    int power_mode;
+#endif
+
 #ifdef AUDIOHW_HAVE_FUNCTIONAL_MODE
     int func_mode;
 #endif
diff --git a/apps/settings_list.c b/apps/settings_list.c
index e5c02f6bf3..1b06bfe11c 100644
--- a/apps/settings_list.c
+++ b/apps/settings_list.c
@@ -859,6 +859,12 @@ const struct settings_list settings[] = {
 #endif
 #endif
 
+#ifdef AUDIOHW_HAVE_POWER_MODE
+    CHOICE_SETTING(F_SOUNDSETTING, power_mode, LANG_DAC_POWER_MODE, 0,
+                   "dac_power_mode", "high,low", sound_set_power_mode,
+                   2, ID2P(LANG_DAC_POWER_HIGH), ID2P(LANG_DAC_POWER_LOW)),
+#endif
+
     /* playback */
     OFFON_SETTING(0, playlist_shuffle, LANG_SHUFFLE, false, "shuffle", NULL),
     SYSTEM_SETTING(NVRAM(4), resume_index, -1),
diff --git a/firmware/drivers/audio/sdl.c b/firmware/drivers/audio/sdl.c
index fb49a291d1..89f40baedf 100644
--- a/firmware/drivers/audio/sdl.c
+++ b/firmware/drivers/audio/sdl.c
@@ -118,6 +118,10 @@ void audiohw_set_lineout_volume(int vol_l, int vol_r)
 void audiohw_set_filter_roll_off(int value)
     { (void)value; }
 #endif
+#if defined(AUDIOHW_HAVE_POWER_MODE)
+void audiohw_set_power_mode(int value)
+    { (void)value; }
+#endif
 
 void audiohw_close(void) {}
 
diff --git a/firmware/export/audiohw.h b/firmware/export/audiohw.h
index 8a46cbea78..d862c977db 100644
--- a/firmware/export/audiohw.h
+++ b/firmware/export/audiohw.h
@@ -41,6 +41,7 @@
 #define LIN_GAIN_CAP          (1 << 11)
 #define MIC_GAIN_CAP          (1 << 12)
 #define FILTER_ROLL_OFF_CAP   (1 << 13)
+#define POWER_MODE_CAP        (1 << 14)
 
 /* Used by every driver to export its min/max/default values for its audio
    settings. */
@@ -391,6 +392,10 @@ enum AUDIOHW_EQ_SETTINGS
 #define AUDIOHW_HAVE_FILTER_ROLL_OFF
 #endif
 
+#if (AUDIOHW_CAPS & POWER_MODE_CAP)
+#define AUDIOHW_HAVE_POWER_MODE
+#endif
+
 #endif /* AUDIOHW_CAPS */
 
 #ifdef HAVE_SW_TONE_CONTROLS
@@ -586,6 +591,16 @@ void audiohw_set_depth_3d(int val);
 void audiohw_set_filter_roll_off(int val);
 #endif
 
+#ifdef AUDIOHW_HAVE_POWER_MODE
+/**
+ * Set DAC's power saving mode.
+ * @param enable 0 - highest performance, 1 - battery saving
+ * NOTE: AUDIOHW_CAPS need to contain
+ *          POWER_MODE_CAP
+ */
+void audiohw_set_power_mode(int mode);
+#endif
+
 void audiohw_set_frequency(int fsel);
 
 #ifdef HAVE_RECORDING
diff --git a/firmware/export/audiohw_settings.h b/firmware/export/audiohw_settings.h
index 1d3e0dc12f..8010963ea4 100644
--- a/firmware/export/audiohw_settings.h
+++ b/firmware/export/audiohw_settings.h
@@ -103,6 +103,9 @@ AUDIOHW_SETTINGS(
 #if defined(AUDIOHW_HAVE_FILTER_ROLL_OFF)
     AUDIOHW_SETTING_ENT(FILTER_ROLL_OFF,    sound_set_filter_roll_off)
 #endif
+#if defined(AUDIOHW_HAVE_POWER_MODE)
+    AUDIOHW_SETTING_ENT(POWER_MODE,         sound_set_power_mode)
+#endif
 /* Hardware EQ tone controls */
 #if defined(AUDIOHW_HAVE_EQ)
     AUDIOHW_SETTING_ENT(EQ_BAND1_GAIN,      sound_set_hw_eq_band1_gain)
diff --git a/firmware/export/sound.h b/firmware/export/sound.h
index 2e04cac854..8e79dd0aed 100644
--- a/firmware/export/sound.h
+++ b/firmware/export/sound.h
@@ -57,6 +57,10 @@ void sound_set_depth_3d(int value);
 void sound_set_filter_roll_off(int value);
 #endif
 
+#if defined(AUDIOHW_HAVE_POWER_MODE)
+void sound_set_power_mode(int value);
+#endif
+
 #ifdef AUDIOHW_HAVE_EQ
 /*
  * band = SOUND_EQ_BANDb
diff --git a/firmware/sound.c b/firmware/sound.c
index 71bdc25003..6fe6115406 100644
--- a/firmware/sound.c
+++ b/firmware/sound.c
@@ -145,6 +145,9 @@ int sound_current(int setting)
 #if defined(AUDIOHW_HAVE_FILTER_ROLL_OFF)
         SOUND_CUR_SET(FILTER_ROLL_OFF,    global_settings.roll_off)
 #endif
+#if defined(AUDIOHW_HAVE_POWER_MODE)
+        SOUND_CUR_SET(POWER_MODE,         global_settings.power_mode)
+#endif
 
 #if 0 /*WRONG -- these need to index the hw_eq_bands[AUDIOHW_EQ_BAND_NUM] struct*/
 /* Hardware EQ tone controls */
@@ -425,6 +428,16 @@ void sound_set_filter_roll_off(int value)
 }
 #endif
 
+#if defined(AUDIOHW_HAVE_POWER_MODE)
+void sound_set_power_mode(int value)
+{
+    if (!audio_is_initialized)
+        return;
+
+    audiohw_set_power_mode(value);
+}
+#endif
+
 #if defined(AUDIOHW_HAVE_EQ)
 int sound_enum_hw_eq_band_setting(unsigned int band,
                                   unsigned int band_setting)