ASoC: Move standard kcontrol helpers to the component level

After moving the IO layer inside ASoC to the component level we can now easily
move the standard control helpers also to the component level. This allows to
reuse the same standard helper control implementations for other components.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

include/sound/soc.h

@@ -1249,6 +1249,22 @@ static inline bool snd_soc_codec_is_active(struct snd_soc_codec *codec)
 	return snd_soc_component_is_active(&codec->component);
 }
 
+/**
+ * snd_soc_kcontrol_component() - Returns the component that registered the
+ *  control
+ * @kcontrol: The control for which to get the component
+ *
+ * Note: This function will work correctly if the control has been registered
+ * for a component. Either with snd_soc_add_codec_controls() or
+ * snd_soc_add_platform_controls() or via  table based setup for either a
+ * CODEC, a platform or component driver. Otherwise the behavior is undefined.
+ */
+static inline struct snd_soc_component *snd_soc_kcontrol_component(
+	struct snd_kcontrol *kcontrol)
+{
+	return snd_kcontrol_chip(kcontrol);
+}
+
 /**
  * snd_soc_kcontrol_codec() - Returns the CODEC that registered the control
  * @kcontrol: The control for which to get the CODEC
@@ -1260,7 +1276,7 @@ static inline bool snd_soc_codec_is_active(struct snd_soc_codec *codec)
 static inline struct snd_soc_codec *snd_soc_kcontrol_codec(
 	struct snd_kcontrol *kcontrol)
 {
-	return snd_kcontrol_chip(kcontrol);
+	return snd_soc_component_to_codec(snd_soc_kcontrol_component(kcontrol));
 }
 
 /**
@@ -1274,7 +1290,7 @@ static inline struct snd_soc_codec *snd_soc_kcontrol_codec(
 static inline struct snd_soc_platform *snd_soc_kcontrol_platform(
 	struct snd_kcontrol *kcontrol)
 {
-	return snd_kcontrol_chip(kcontrol);
+	return snd_soc_component_to_platform(snd_soc_kcontrol_component(kcontrol));
 }
 
 int snd_soc_util_init(void);