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Commit 0890c2b7 authored by Richard Genoud's avatar Richard Genoud Committed by Mark Brown
Browse files

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: default avatarRichard Genoud <richard.genoud@gmail.com>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent 5ae90d8e

sound/soc/codecs/wm8731.c

+57 −3
Original line number Diff line number Diff line
@@ -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,