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ALSA: pcm: add SNDRV_PCM_TRIGGER_DRAIN trigger

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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>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Libin Yang
2014-12-31 22:09:54 +08:00
committed by Takashi Iwai
parent 0d02e12927
commit 48d882978e
3 changed files with 11 additions and 1 deletions
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1
include/sound/pcm.h
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@@ -106,6 +106,7 @@ 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)