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It's better not to use fixed constants since the lower volume limit may not be constant.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17329 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Sevakis 2008-05-03 16:10:46 +00:00
parent 28df6bf869
commit 8f0a1b3e6c
1 changed files with 24 additions and 18 deletions
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36
firmware/drivers/audio/wm8978.c
View file

@ -26,9 +26,15 @@
//#define LOGF_ENABLE
#include "logf.h"
/* #define to help adjust lower volume limit */
#define HW_VOL_MIN 0
#define HW_VOL_MUTE 0
#define HW_VOL_MAX 96
#define HW_VOL_ANA_MIN 0
#define HW_VOL_ANA_MAX 63
#define HW_VOL_DIG_MAX 255
#define HW_VOL_DIG_THRESHOLD (HW_VOL_MAX - HW_VOL_ANA_MAX)
#define HW_VOL_DIG_MIN (HW_VOL_DIG_MAX - 2*HW_VOL_DIG_THRESHOLD)
/* TODO: Define/refine an API for special hardware steps outside the
* main codec driver such as special GPIO handling. */
@ -119,7 +125,7 @@ struct
bool ahw_mute;
} wmc_vol =
{
0, 0, false
HW_VOL_MUTE, HW_VOL_MUTE, false
};
static void wmc_write(unsigned int reg, unsigned int val)
@ -222,10 +228,10 @@ void audiohw_postinit(void)
wmc_write(WMC_ADDITIONAL_CTRL, WMC_SR_48KHZ); /* 44.1 */
/* Initialize to minimum volume */
wmc_write_masked(WMC_LEFT_DAC_DIGITAL_VOL, 189, WMC_DVOL);
wmc_write_masked(WMC_LOUT1_HP_VOLUME_CTRL, 0, WMC_AVOL);
wmc_write_masked(WMC_RIGHT_DAC_DIGITAL_VOL, 189, WMC_DVOL);
wmc_write_masked(WMC_ROUT1_HP_VOLUME_CTRL, 0, WMC_AVOL);
wmc_write_masked(WMC_LEFT_DAC_DIGITAL_VOL, HW_VOL_DIG_MIN, WMC_DVOL);
wmc_write_masked(WMC_LOUT1_HP_VOLUME_CTRL, HW_VOL_ANA_MIN, WMC_AVOL);
wmc_write_masked(WMC_RIGHT_DAC_DIGITAL_VOL, HW_VOL_DIG_MIN, WMC_DVOL);
wmc_write_masked(WMC_ROUT1_HP_VOLUME_CTRL, HW_VOL_ANA_MIN, WMC_AVOL);
/* ADC silenced */
wmc_write_masked(WMC_LEFT_ADC_DIGITAL_VOL, 0x00, WMC_DVOL);
@ -245,38 +251,38 @@ void audiohw_set_headphone_vol(int vol_l, int vol_r)
/* When analogue volume falls below -57dB (0x00) start attenuating the
* DAC volume */
if (vol_l >= 33)
if (vol_l >= HW_VOL_DIG_THRESHOLD)
{
if (vol_l > HW_VOL_MAX)
vol_l = HW_VOL_MAX;
dac_l = 255;
vol_l -= 33;
dac_l = HW_VOL_DIG_MAX;
vol_l -= HW_VOL_DIG_THRESHOLD;
}
else
{
if (vol_l < HW_VOL_MIN)
vol_l = HW_VOL_MIN;
dac_l = 2*vol_l + 189;
vol_l = 0;
dac_l = 2*vol_l + HW_VOL_DIG_MIN;
vol_l = HW_VOL_ANA_MIN;
}
if (vol_r >= 33)
if (vol_r >= HW_VOL_DIG_THRESHOLD)
{
if (vol_r > HW_VOL_MAX)
vol_r = HW_VOL_MAX;
dac_r = 255;
vol_r -= 33;
dac_r = HW_VOL_DIG_MAX;
vol_r -= HW_VOL_DIG_THRESHOLD;
}
else
{
if (vol_r < HW_VOL_MIN)
vol_r = HW_VOL_MIN;
dac_r = 2*vol_r + 189;
vol_r = 0;
dac_r = 2*vol_r + HW_VOL_DIG_MIN;
vol_r = HW_VOL_ANA_MIN;
}
/* Have to write both channels always to have the latching work */