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ASoC: wm8731: add rates constraints 

Depending on the mclk (or crystal) selected, the wm8731 codec have some
constraints on its data sampling rates:
e.g. with a 12.288MHz or 18.432MHz crystal, the authorized rates are
8KHz, 32KHz, 48KHz and 96KHz.

Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Richard Genoud 2013-07-30 11:59:45 +02:00 committed by Mark Brown
parent 5ae90d8e46
commit 0890c2b7be
1 changed files with 57 additions and 3 deletions
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60
sound/soc/codecs/wm8731.c
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@ -45,6 +45,7 @@ static const char *wm8731_supply_names[WM8731_NUM_SUPPLIES] = {
struct wm8731_priv {
struct regmap *regmap;
struct regulator_bulk_data supplies[WM8731_NUM_SUPPLIES];
const struct snd_pcm_hw_constraint_list *constraints;
unsigned int sysclk;
int sysclk_type;
int playback_fs;
@ -290,6 +291,36 @@ static const struct _coeff_div coeff_div[] = {
{12000000, 88200, 136, 0xf, 0x1, 0x1},
};
/* rates constraints */
static const unsigned int wm8731_rates_12000000[] = {
8000, 32000, 44100, 48000, 96000, 88200,
};
static const unsigned int wm8731_rates_12288000_18432000[] = {
8000, 32000, 48000, 96000,
};
static const unsigned int wm8731_rates_11289600_16934400[] = {
8000, 44100, 88200,
};
static const struct snd_pcm_hw_constraint_list wm8731_constraints_12000000 = {
.list = wm8731_rates_12000000,
.count = ARRAY_SIZE(wm8731_rates_12000000),
};
static const
struct snd_pcm_hw_constraint_list wm8731_constraints_12288000_18432000 = {
.list = wm8731_rates_12288000_18432000,
.count = ARRAY_SIZE(wm8731_rates_12288000_18432000),
};
static const
struct snd_pcm_hw_constraint_list wm8731_constraints_11289600_16934400 = {
.list = wm8731_rates_11289600_16934400,
.count = ARRAY_SIZE(wm8731_rates_11289600_16934400),
};
static inline int get_coeff(int mclk, int rate)
{
int i;
@ -362,17 +393,26 @@ static int wm8731_set_dai_sysclk(struct snd_soc_dai *codec_dai,
}
switch (freq) {
case 11289600:
case 0:
wm8731->constraints = NULL;
break;
case 12000000:
wm8731->constraints = &wm8731_constraints_12000000;
break;
case 12288000:
case 16934400:
case 18432000:
wm8731->sysclk = freq;
wm8731->constraints = &wm8731_constraints_12288000_18432000;
break;
case 16934400:
case 11289600:
wm8731->constraints = &wm8731_constraints_11289600_16934400;
break;
default:
return -EINVAL;
}
wm8731->sysclk = freq;
snd_soc_dapm_sync(&codec->dapm);
return 0;
@ -475,12 +515,26 @@ static int wm8731_set_bias_level(struct snd_soc_codec *codec,
return 0;
}
static int wm8731_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(dai->codec);
if (wm8731->constraints)
snd_pcm_hw_constraint_list(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_RATE,
wm8731->constraints);
return 0;
}
#define WM8731_RATES SNDRV_PCM_RATE_8000_96000
#define WM8731_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
SNDRV_PCM_FMTBIT_S24_LE)
static const struct snd_soc_dai_ops wm8731_dai_ops = {
.startup = wm8731_startup,
.hw_params = wm8731_hw_params,
.digital_mute = wm8731_mute,
.set_sysclk = wm8731_set_dai_sysclk,