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ASoC: snd_soc_dai_ops trigger function description 

Add a comment to the trigger function in snd_soc_dai_ops struct about
possible command sequences.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Markus Pargmann 2013-10-11 12:11:02 +02:00 committed by Mark Brown
parent 38f2b8cbfb
commit 9f1614aae5
1 changed files with 7 additions and 0 deletions
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7
include/sound/soc-dai.h
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@ -166,6 +166,13 @@ struct snd_soc_dai_ops {
struct snd_soc_dai *); struct snd_soc_dai *);
int (*prepare)(struct snd_pcm_substream *, int (*prepare)(struct snd_pcm_substream *,
struct snd_soc_dai *); struct snd_soc_dai *);
/*
* NOTE: Commands passed to the trigger function are not necessarily
* compatible with the current state of the dai. For example this
* sequence of commands is possible: START STOP STOP.
* So do not unconditionally use refcounting functions in the trigger
* function, e.g. clk_enable/disable.
*/
int (*trigger)(struct snd_pcm_substream *, int, int (*trigger)(struct snd_pcm_substream *, int,
struct snd_soc_dai *); struct snd_soc_dai *);
int (*bespoke_trigger)(struct snd_pcm_substream *, int, int (*bespoke_trigger)(struct snd_pcm_substream *, int,