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ASoC: Allow mulitple usage count of codec and cpu dai 

If we are to have a snd_soc_dai i.e, cpu_dai and codec_dai, shared among two
or more dai_links we need to log the number of active users of the dai.
For that, we change semantics of the snd_soc_dai.active flag from indicator
to reference counter.

Signed-off-by: Jassi Brar <jassi.brar@samsung.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Jassi Brar 2010-02-26 09:12:32 +09:00 committed by Mark Brown
parent 6423c1875c
commit 14dc5734bd
2 changed files with 19 additions and 14 deletions
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2
include/sound/soc.h
View File

@ -375,7 +375,7 @@ struct snd_soc_pcm_stream {
unsigned int rate_max; /* max rate */
unsigned int channels_min; /* min channels */
unsigned int channels_max; /* max channels */
unsigned int active:1; /* stream is in use */
unsigned int active; /* num of active users of the stream */
};
/* SoC audio ops */

31
sound/soc/soc-core.c
View File

@ -454,11 +454,15 @@ static int soc_pcm_open(struct snd_pcm_substream *substream)
pr_debug("asoc: min rate %d max rate %d\n", runtime->hw.rate_min,
runtime->hw.rate_max);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
cpu_dai->playback.active = codec_dai->playback.active = 1;
else
cpu_dai->capture.active = codec_dai->capture.active = 1;
cpu_dai->active = codec_dai->active = 1;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
cpu_dai->playback.active++;
codec_dai->playback.active++;
} else {
cpu_dai->capture.active++;
codec_dai->capture.active++;
}
cpu_dai->active++;
codec_dai->active++;
card->codec->active++;
mutex_unlock(&pcm_mutex);
return 0;
@ -530,15 +534,16 @@ static int soc_codec_close(struct snd_pcm_substream *substream)
mutex_lock(&pcm_mutex);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
cpu_dai->playback.active = codec_dai->playback.active = 0;
else
cpu_dai->capture.active = codec_dai->capture.active = 0;
if (codec_dai->playback.active == 0 &&
codec_dai->capture.active == 0) {
cpu_dai->active = codec_dai->active = 0;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
cpu_dai->playback.active--;
codec_dai->playback.active--;
} else {
cpu_dai->capture.active--;
codec_dai->capture.active--;
}
cpu_dai->active--;
codec_dai->active--;
codec->active--;
/* Muting the DAC suppresses artifacts caused during digital