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ASoC: Add cs4270 support for slave mode configurations 

Added support for scenarios where the Cirrus CS4270 audio codec is slave
to the bitclk and lrclk. Mixed setups are unsupported.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Daniel Mack 2009-02-25 14:37:21 +01:00 committed by Mark Brown
parent c8efef1745
commit 4eae080dda
1 changed files with 23 additions and 1 deletions
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24
sound/soc/codecs/cs4270.c
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@ -109,6 +109,7 @@ struct cs4270_private {
u8 reg_cache[CS4270_NUMREGS];
unsigned int mclk; /* Input frequency of the MCLK pin */
unsigned int mode; /* The mode (I2S or left-justified) */
unsigned int slave_mode;
};
/**
@ -247,6 +248,7 @@ static int cs4270_set_dai_fmt(struct snd_soc_dai *codec_dai,
struct cs4270_private *cs4270 = codec->private_data;
int ret = 0;
/* set DAI format */
switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_I2S:
case SND_SOC_DAIFMT_LEFT_J:
@ -257,6 +259,21 @@ static int cs4270_set_dai_fmt(struct snd_soc_dai *codec_dai,
ret = -EINVAL;
}
/* set master/slave audio interface */
switch (format & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBS_CFS:
cs4270->slave_mode = 1;
break;
case SND_SOC_DAIFMT_CBM_CFM:
cs4270->slave_mode = 0;
break;
case SND_SOC_DAIFMT_CBM_CFS:
/* unsupported - cs4270 can eigther be slave or master to
* both the bitclk and the lrclk. */
default:
ret = -EINVAL;
}
return ret;
}
@ -399,7 +416,12 @@ static int cs4270_hw_params(struct snd_pcm_substream *substream,
reg = snd_soc_read(codec, CS4270_MODE);
reg &= ~(CS4270_MODE_SPEED_MASK | CS4270_MODE_DIV_MASK);
reg |= cs4270_mode_ratios[i].speed_mode | cs4270_mode_ratios[i].mclk;
reg |= cs4270_mode_ratios[i].mclk;
if (cs4270->slave_mode)
reg |= CS4270_MODE_SLAVE;
else
reg |= cs4270_mode_ratios[i].speed_mode;
ret = snd_soc_write(codec, CS4270_MODE, reg);
if (ret < 0) {