ASoC: Add snd_soc_kcontrol_codec() helper function

For CODEC controls snd_kcontrol_chip() currently returns a pointer to the
CODEC that registered the control. With the upcoming consolidation of
platform and CODEC controls this will change. Prepare for this by introducing
the snd_soc_kcontrol_codec() helper function that will hide the implementation
details of how the CODEC for a control can be obtained. This will allow us to
change this easily in the future.

The patch also updates all CODEC drivers to use the new helper function.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 0b83168d8ff4..e150030b754d 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -1228,6 +1228,20 @@ static inline bool snd_soc_codec_is_active(struct snd_soc_codec *codec)
         return snd_soc_component_is_active(&codec->component);
 }
 
+/**
+ * snd_soc_kcontrol_codec() - Returns the CODEC that registered the control
+ * @kcontrol: The control for which to get the CODEC
+ *
+ * Note: This function will only work correctly if the control has been
+ * registered with snd_soc_add_codec_controls() or via table based setup of
+ * snd_soc_codec_driver. Otherwise the behavior is undefined.
+ */
+static inline struct snd_soc_codec *snd_soc_kcontrol_codec(
+        struct snd_kcontrol *kcontrol)
+{
+        return snd_kcontrol_chip(kcontrol);
+}
+
 int snd_soc_util_init(void);
 void snd_soc_util_exit(void);