From: Libin Yang libin.yang@intel.com
Add SNDRV_PCM_TRIGGER_DRAIN trigger for pcm drain.
Some audio devices require notification of drain events in order to properly drain and shutdown an audio stream.
Signed-off-by: Libin Yang libin.yang@intel.com --- include/sound/pcm.h | 1 + sound/core/pcm_native.c | 5 +++++ 2 files changed, 6 insertions(+)
diff --git a/include/sound/pcm.h b/include/sound/pcm.h index 8bb00a2..bb77aa3 100644 --- a/include/sound/pcm.h +++ b/include/sound/pcm.h @@ -109,6 +109,7 @@ struct snd_pcm_ops { #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4 #define SNDRV_PCM_TRIGGER_SUSPEND 5 #define SNDRV_PCM_TRIGGER_RESUME 6 +#define SNDRV_PCM_TRIGGER_DRAIN 7
#define SNDRV_PCM_POS_XRUN ((snd_pcm_uframes_t)-1)
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c index 166d59c..15fe682 100644 --- a/sound/core/pcm_native.c +++ b/sound/core/pcm_native.c @@ -1517,6 +1517,11 @@ static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) { struct snd_pcm_runtime *runtime = substream->runtime; if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { + + if (substream->runtime->trigger_master == substream) + substream->ops->trigger(substream, + SNDRV_PCM_TRIGGER_DRAIN); + switch (runtime->status->state) { case SNDRV_PCM_STATE_PREPARED: /* start playback stream if possible */