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wm8975: document audiohw settings 

Change-Id: I0456f85e4ebc821c23e25026fbee3d8cf7526ee7
This commit is contained in:
Amaury Pouly 2016-08-21 20:31:55 +01:00
parent 69ea311398
commit 4d526df7ac
2 changed files with 7 additions and 0 deletions
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2
firmware/drivers/audio/wm8975.c
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@ -296,6 +296,8 @@ void audiohw_disable_recording(void)
wm8975_write(PWRMGMT1, wm8975_regs[PWRMGMT1]);
}
/* volume in 0 .. 63, corresponds to -17.25dB .. 30dB in steps of 0.75dB
* microphone has an extra 20dB boost so 0 .. 63 corresponds to 2.75dB .. 50dB */
void audiohw_set_recvol(int left, int right, int type)
{
switch (type)

5
firmware/export/wm8975.h
View File

@ -29,8 +29,13 @@ AUDIOHW_SETTING(VOLUME, "dB", 0, 1, -74, 6, -25)
AUDIOHW_SETTING(BASS, "dB", 0, 1, -6, 9, 0)
AUDIOHW_SETTING(TREBLE, "dB", 0, 1, -6, 9, 0)
#ifdef HAVE_RECORDING
/* The input PGAs have a gain range from -17.25dB .. 30dB in steps of 0.75dB
* Values: 0, 1, ..., 63
* => -17.25, -16.5dB, ..., 30.0dB */
AUDIOHW_SETTING(LEFT_GAIN, "dB", 1, 1, 0, 63, 23, ((val - 23) * 15) / 2)
AUDIOHW_SETTING(RIGHT_GAIN, "dB", 1, 1, 0, 63, 23, ((val - 23) * 15) / 2)
/* The microphone has an extra 20dB boost before the input PGA so 0 .. 63
* corresponds to 2.75dB .. 50dB */
AUDIOHW_SETTING(MIC_GAIN, "dB", 1, 1, 0, 63, 0, ((val - 23) * 15) / 2 + 200)
#endif /* HAVE_RECORDING */