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WM8750: Extend recording gain range.

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Use two stage amplification (PGA gain and digital stage gain)
combined to extend recgain range to -17.25 +60.0dB.

Change-Id: I4df8af801730b7efb2d35096de077ba31d331222
This commit is contained in:
Marcin Bukat 2012-01-25 09:21:38 +01:00
parent c42f19f897
commit 0499aff9d0
1 changed files with 55 additions and 15 deletions
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70
firmware/drivers/audio/wm8751.c
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@ -40,10 +40,15 @@ const struct sound_settings_info audiohw_settings[] = {
[SOUND_CHANNELS] = {"", 0, 1, 0, 5, 0},
[SOUND_STEREO_WIDTH] = {"%", 0, 5, 0, 250, 100},
#ifdef HAVE_RECORDING
/* -17.25dB to 30.0dB in 0.75dB increments 64 steps*/
[SOUND_LEFT_GAIN] = {"dB", 2, 75, -1725, 3000, 0},
[SOUND_RIGHT_GAIN] = {"dB", 2, 75, -1725, 3000, 0},
[SOUND_MIC_GAIN] = {"dB", 2, 75, -1725, 3000, 3000},
/* PGA -17.25dB to 30.0dB in 0.75dB increments 64 steps
* digital gain 0dB to 30.0dB in 0.5dB increments
* we use 0.75dB fake steps through whole range
*
* This combined gives -17.25 to 60.0dB
*/
[SOUND_LEFT_GAIN] = {"dB", 2, 75, -1725, 6000, 0},
[SOUND_RIGHT_GAIN] = {"dB", 2, 75, -1725, 6000, 0},
[SOUND_MIC_GAIN] = {"dB", 2, 75, -1725, 6000, 3000},
#endif
#ifdef AUDIOHW_HAVE_BASS_CUTOFF
[SOUND_BASS_CUTOFF] = {"Hz", 0, 70, 130, 200, 200},
@ -181,13 +186,6 @@ void audiohw_set_treble_cutoff(int val)
}
#endif
#ifdef HAVE_RECORDING
static int recvol2hw(int value)
{
/* -1725 to 3000 => 0 ... 23 ... 63 */
return ((4 * value) / 300) + 23;
}
#endif
int sound_val2phys(int setting, int value)
{
@ -667,17 +665,59 @@ void audiohw_set_recsrc(int source, bool recording)
} /* switch(source) */
}
/* Setup PGA gain */
static int digital_gain2hw(int value)
{
/* -9700 to 3000 => 0 ... 195 ... 255 */
return (2 * value) / 100 + 195;
}
static int pga_gain2hw(int value)
{
/* -1725 to 3000 => 0 ... 23 ... 63 */
return ((4 * value) / 300) + 23;
}
void audiohw_set_recvol(int vol_l, int vol_r, int type)
{
wmcodec_set_reg(LINVOL, LINVOL_LIZC | LINVOL_LINVOL(recvol2hw(vol_l)));
int d_vol_l = 0;
int d_vol_r = 0;
if (vol_l > 3000)
{
d_vol_l = vol_l - 3000;
vol_l = 3000;
}
if (vol_r > 3000)
{
d_vol_r = vol_r - 3000;
vol_r = 3000;
}
/* PGA left gain */
wmcodec_set_reg(LINVOL, LINVOL_LIZC | LINVOL_LINVOL(pga_gain2hw(vol_l)));
/* digital left gain set */
wmcodec_set_reg(LADCVOL, digital_gain2hw(d_vol_l));
if (type == AUDIO_GAIN_MIC)
{
/* PGA right gain = PGA left gain*/
wmcodec_set_reg(RINVOL, RINVOL_RIVU | RINVOL_RIZC |
RINVOL_RINVOL(recvol2hw(vol_l)));
RINVOL_RINVOL(pga_gain2hw(vol_l)));
/* digital right gain = digital left gain*/
wmcodec_set_reg(RADCVOL, RADCVOL_RAVU | digital_gain2hw(d_vol_l));
}
else
{
/* PGA right gain */
wmcodec_set_reg(RINVOL, RINVOL_RIVU | RINVOL_RIZC |
RINVOL_RINVOL(recvol2hw(vol_r)));
RINVOL_RINVOL(pga_gain2hw(vol_r)));
/* digital right gain */
wmcodec_set_reg(RADCVOL, RADCVOL_RAVU | digital_gain2hw(d_vol_r));
}
}
#endif /* HAVE_RECORDING */
#endif /* HAVE_WM8750 */