[PATCH 07/13] ASoC: Add helper function to cast component back to CODEC

[Lars-Peter Clausen <lars@metafoo.de>]

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,
-- 
1.8.0