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authorMarkus Pargmann2013-10-11 12:11:02 +0200
committerMark Brown2013-10-14 18:01:50 +0100
commit9f1614aae59033b79941220f65ad36f5fe54a579 (patch)
tree278affc34bdfbde6cc205abdbd6d5b3f8dd578b9 /include/sound
parent38f2b8cbfb1ef517af8af5a63bdff073b7b078fd (diff)
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>
Diffstat (limited to 'include/sound')
-rw-r--r--include/sound/soc-dai.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/sound/soc-dai.h b/include/sound/soc-dai.h
index ae9a227d35d3..0f2e5daa1451 100644
--- a/include/sound/soc-dai.h
+++ b/include/sound/soc-dai.h
@@ -166,6 +166,13 @@ struct snd_soc_dai_ops {
struct snd_soc_dai *);
int (*prepare)(struct snd_pcm_substream *,
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,
struct snd_soc_dai *);
int (*bespoke_trigger)(struct snd_pcm_substream *, int,