ASoC: Add helper function to cast component back to CODEC

Add a helper function to cast back from a component struct to the CODEC struct
it is embedded in. This is useful in situations where we know that a certain
component is a CODEC and want to get access to some CODEC specific properties.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Lars-Peter Clausen 2014-03-18 09:02:10 +01:00 committed by Mark Brown
parent 5c1d5f091d
commit 28d6d175d8

View File

@ -1104,6 +1104,19 @@ struct soc_enum {
const unsigned int *values;
};
/**
* snd_soc_component_to_codec() - Casts a component to the CODEC it is embedded in
* @component: The component to cast to a CODEC
*
* This function must only be used on components that are known to be CODECs.
* Otherwise the behavior is undefined.
*/
static inline struct snd_soc_codec *snd_soc_component_to_codec(
struct snd_soc_component *component)
{
return container_of(component, struct snd_soc_codec, component);
}
/* codec IO */
unsigned int snd_soc_read(struct snd_soc_codec *codec, unsigned int reg);
unsigned int snd_soc_write(struct snd_soc_codec *codec,