From: Lars-Peter Clausen <lars@metafoo.de>
Date: Sun, 18 May 2014 12:24:12 +0000 (+0200)
Subject: ASoC: Add helper functions to cast from DAPM context to CODEC/platform
X-Git-Tag: MMI-PSA29.97-13-9~12057^2~24^2~13^2~2
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=24089e04cb1b4975bafd6368ab8b92082ebf6ad7;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git

ASoC: Add helper functions to cast from DAPM context to CODEC/platform

This is useful if we have a pointer to a DAPM context and know that it is a
CODEC or platform DAPM context and want to get a pointer to the CODEC or
platform.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>
---

diff --git a/include/sound/soc.h b/include/sound/soc.h
index b9ee22018352..520b6684b04e 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -1135,6 +1135,33 @@ static inline struct snd_soc_platform *snd_soc_component_to_platform(
 	return container_of(component, struct snd_soc_platform, component);
 }
 
+/**
+ * snd_soc_dapm_to_codec() - Casts a DAPM context to the CODEC it is embedded in
+ * @dapm: The DAPM context to cast to the CODEC
+ *
+ * This function must only be used on DAPM contexts that are known to be part of
+ * a CODEC (e.g. in a CODEC driver). Otherwise the behavior is undefined.
+ */
+static inline struct snd_soc_codec *snd_soc_dapm_to_codec(
+	struct snd_soc_dapm_context *dapm)
+{
+	return container_of(dapm, struct snd_soc_codec, dapm);
+}
+
+/**
+ * snd_soc_dapm_to_platform() - Casts a DAPM context to the platform it is
+ *  embedded in
+ * @dapm: The DAPM context to cast to the platform.
+ *
+ * This function must only be used on DAPM contexts that are known to be part of
+ * a platform (e.g. in a platform driver). Otherwise the behavior is undefined.
+ */
+static inline struct snd_soc_platform *snd_soc_dapm_to_platform(
+	struct snd_soc_dapm_context *dapm)
+{
+	return container_of(dapm, struct snd_soc_platform, dapm);
+}
+
 /* codec IO */
 unsigned int snd_soc_read(struct snd_soc_codec *codec, unsigned int reg);
 int snd_soc_write(struct snd_soc_codec *codec, unsigned int reg,