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authorRichard Genoud <richard.genoud@gmail.com>2013-07-30 13:59:45 +0400
committerMark Brown <broonie@linaro.org>2013-07-30 15:28:01 +0400
commit0890c2b7be08b0928f7f507e371918205a0312f7 (patch)
treee646a76e52744cb042fd31aa4973e4fd3a5beabd /sound/soc/codecs/wm8731.c
parent5ae90d8e467e625e447000cb4335c4db973b1095 (diff)
downloadlinux-0890c2b7be08b0928f7f507e371918205a0312f7.tar.xz
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>
Diffstat (limited to 'sound/soc/codecs/wm8731.c')
-rw-r--r--sound/soc/codecs/wm8731.c60
1 files changed, 57 insertions, 3 deletions
diff --git a/sound/soc/codecs/wm8731.c b/sound/soc/codecs/wm8731.c
index 5276062d6c79..456bb8c6d759 100644
--- a/sound/soc/codecs/wm8731.c
+++ b/sound/soc/codecs/wm8731.c
@@ -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,