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

1 files changed, 4 insertions, 0 deletions

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) {}