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ASoC: Add CODEC volatile register operation 

Add a volatile_register() operation to the CODEC structure providing a
standard operation to query if a register is volatile. This will be used
to factor out the register cache I/O operations for the CODECs.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2009-07-05 15:12:22 +01:00
parent af0adf3e81
commit 096e49d5e6
2 changed files with 19 additions and 0 deletions
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2
include/sound/soc.h
View File

@ -191,6 +191,7 @@ int snd_soc_register_platform(struct snd_soc_platform *platform);
void snd_soc_unregister_platform(struct snd_soc_platform *platform);
int snd_soc_register_codec(struct snd_soc_codec *codec);
void snd_soc_unregister_codec(struct snd_soc_codec *codec);
int snd_soc_codec_volatile_register(struct snd_soc_codec *codec, int reg);
#ifdef CONFIG_PM
int snd_soc_suspend_device(struct device *dev);
@ -361,6 +362,7 @@ struct snd_soc_codec {
int (*write)(struct snd_soc_codec *, unsigned int, unsigned int);
int (*display_register)(struct snd_soc_codec *, char *,
size_t, unsigned int);
int (*volatile_register)(unsigned int);
hw_write_t hw_write;
hw_read_t hw_read;
void *reg_cache;

17
sound/soc/soc-core.c
View File

@ -1125,6 +1125,23 @@ static int soc_new_pcm(struct snd_soc_device *socdev,
return ret;
}
/**
* snd_soc_codec_volatile_register: Report if a register is volatile.
*
* @codec: CODEC to query.
* @reg: Register to query.
*
* Boolean function indiciating if a CODEC register is volatile.
*/
int snd_soc_codec_volatile_register(struct snd_soc_codec *codec, int reg)
{
if (codec->volatile_register)
return codec->volatile_register(reg);
else
return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_codec_volatile_register);
/* codec register dump */
static ssize_t soc_codec_reg_show(struct snd_soc_codec *codec, char *buf)
{