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 --- include/sound/soc.h | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/include/sound/soc.h b/include/sound/soc.h index f6d7ef4f..a355d0f 100644 --- a/include/sound/soc.h +++ b/include/sound/soc.h @@ -1093,6 +1093,19 @@ 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,