Signed-off-by: Daniel Mack daniel@caiaq.de Cc: Mark Brown broonie@opensource.wolfsonmicro.com Cc: Timur Tabi timur@freescale.com Cc: Liam Girdwood lrg@slimlogic.co.uk --- sound/soc/codecs/cs4270.c | 62 +++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 62 insertions(+), 0 deletions(-)

diff --git a/sound/soc/codecs/cs4270.c b/sound/soc/codecs/cs4270.c index 8069023..acbe961 100644 --- a/sound/soc/codecs/cs4270.c +++ b/sound/soc/codecs/cs4270.c @@ -28,6 +28,7 @@ #include <sound/initval.h> #include <linux/i2c.h> #include <linux/delay.h> +#include <linux/regulator/consumer.h>

#include "cs4270.h"

@@ -114,6 +115,10 @@ struct cs4270_private { unsigned int mode; /* The mode (I2S or left-justified) */ unsigned int slave_mode; unsigned int manual_mute; + + /* power domain regulators (optional) */ + struct regulator *va_reg; + bool va_reg_enabled; };

/** @@ -458,6 +463,42 @@ static int cs4270_hw_params(struct snd_pcm_substream *substream, }

/** + * cs4270_set_bias_level - catches BIAS level changes + * @dai: the SOC DAI + * @level: the new BIAS level + * + * This function controls the voltage regulators to properly + * power up/down the voltage regulator domains + */ + +static int cs4270_set_bias_level(struct snd_soc_codec *codec, + enum snd_soc_bias_level level) +{ + struct cs4270_private *cs4270 = codec->private_data; + + switch (level) { + case SND_SOC_BIAS_ON: + case SND_SOC_BIAS_PREPARE: + /* Full power on */ + if (cs4270->va_reg && !cs4270->va_reg_enabled) { + regulator_enable(cs4270->va_reg); + cs4270->va_reg_enabled = true; + } + break; + case SND_SOC_BIAS_STANDBY: + case SND_SOC_BIAS_OFF: + if (cs4270->va_reg && cs4270->va_reg_enabled) { + regulator_disable(cs4270->va_reg); + cs4270->va_reg_enabled = false; + } + break; + } + + codec->bias_level = level; + return 0; +} + +/** * cs4270_dai_mute - enable/disable the CS4270 external mute * @dai: the SOC DAI * @mute: 0 = disable mute, 1 = enable mute @@ -579,6 +620,7 @@ static int cs4270_probe(struct platform_device *pdev) { struct snd_soc_device *socdev = platform_get_drvdata(pdev); struct snd_soc_codec *codec = cs4270_codec; + struct cs4270_private *cs4270 = codec->private_data; int ret;

/* Connect the codec to the socdev. snd_soc_new_pcms() needs this. */ @@ -599,6 +641,13 @@ static int cs4270_probe(struct platform_device *pdev) goto error_free_pcms; }

+ /* get the power supply regulators (optional) */ + cs4270->va_reg = regulator_get(&pdev->dev, "va"); + if (IS_ERR(cs4270->va_reg)) + cs4270->va_reg = NULL; + + cs4270_set_bias_level(codec, SND_SOC_BIAS_STANDBY); + /* And finally, register the socdev */ ret = snd_soc_init_card(socdev); if (ret < 0) { @@ -623,9 +672,13 @@ error_free_pcms: static int cs4270_remove(struct platform_device *pdev) { struct snd_soc_device *socdev = platform_get_drvdata(pdev); + struct snd_soc_codec *codec = cs4270_codec; + struct cs4270_private *cs4270 = codec->private_data;

snd_soc_free_pcms(socdev);

+ regulator_put(cs4270->va_reg); + return 0; };

@@ -699,6 +752,8 @@ static int cs4270_i2c_probe(struct i2c_client *i2c_client, codec->write = cs4270_i2c_write; codec->reg_cache = cs4270->reg_cache; codec->reg_cache_size = CS4270_NUMREGS; + codec->bias_level = SND_SOC_BIAS_OFF; + codec->set_bias_level = cs4270_set_bias_level;

/* The I2C interface is set up, so pre-fill our register cache */

@@ -808,6 +863,8 @@ static int cs4270_i2c_suspend(struct i2c_client *client, pm_message_t mesg) struct cs4270_private *cs4270 = i2c_get_clientdata(client); struct snd_soc_codec *codec = &cs4270->codec;

+ cs4270_set_bias_level(codec, SND_SOC_BIAS_OFF); + return snd_soc_suspend_device(codec->dev); }

@@ -816,6 +873,11 @@ static int cs4270_i2c_resume(struct i2c_client *client) struct cs4270_private *cs4270 = i2c_get_clientdata(client); struct snd_soc_codec *codec = &cs4270->codec;

+ cs4270_set_bias_level(codec, SND_SOC_BIAS_STANDBY); + + if (codec->suspend_bias_level == SND_SOC_BIAS_ON) + cs4270_set_bias_level(codec, SND_SOC_BIAS_ON); + return snd_soc_resume_device(codec->dev); }