From: Libin Yang <libin.yang(a)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(a)intel.com>
---
include/sound/pcm.h | 1 +
include/uapi/sound/asound.h | 1 +
sound/core/pcm_native.c | 10 +++++++++-
3 files changed, 11 insertions(+), 1 deletion(-)
diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index 3652c94..bf32cea 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -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)
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h
index 1f23cd6..0e88e7a 100644
--- a/include/uapi/sound/asound.h
+++ b/include/uapi/sound/asound.h
@@ -268,6 +268,7 @@ typedef int __bitwise snd_pcm_subformat_t;
#define SNDRV_PCM_INFO_SYNC_START 0x00400000 /* pcm support some kind of sync go */
#define SNDRV_PCM_INFO_NO_PERIOD_WAKEUP 0x00800000 /* period wakeup can be disabled */
#define SNDRV_PCM_INFO_HAS_WALL_CLOCK 0x01000000 /* has audio wall clock for audio/system time sync */
+#define SNDRV_PCM_INFO_DRAIN_TRIGGER 0x40000000 /* internal kernel flag - trigger in drain */
#define SNDRV_PCM_INFO_FIFO_IN_FRAMES 0x80000000 /* internal kernel flag - FIFO size is in frames */
typedef int __bitwise snd_pcm_state_t;
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 095d957..a5fe336 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -420,7 +420,8 @@ int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
hw = &substream->runtime->hw;
if (!params->info) {
- params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
+ params->info = hw->info & ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
+ SNDRV_PCM_INFO_DRAIN_TRIGGER);
if (!hw_support_mmap(substream))
params->info &= ~(SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID);
@@ -1566,6 +1567,13 @@ static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
snd_pcm_post_stop(substream, new_state);
}
}
+
+ if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
+ substream->runtime->trigger_master == substream &&
+ (substream->runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
+ return substream->ops->trigger(substream,
+ SNDRV_PCM_TRIGGER_DRAIN);
+
return 0;
}
--
1.9.1
