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authorMark Brown <broonie@opensource.wolfsonmicro.com>2009-04-07 18:10:13 +0100
committerMark Brown <broonie@opensource.wolfsonmicro.com>2009-04-07 18:51:22 +0100
commit06f409d76f1d382167eb1cadde2e23a73272865d (patch)
treec3ce8d3662d0916bee10fe635cc84665b3c12cca /include/sound
parent6553e192d48af88184029066c30c9464516ea0b7 (diff)
ASoC: Provide core support for symmetric sample rates
Many devices require symmetric configurations of capture and playback data formats, often due to shared clocking but sometimes also due to other shared playback and record configuration in the device. Start providing core support for this by allowing the DAIs or the machine to specify that the sample rates used should be kept symmetric. A flag symmetric_rates is provided in the snd_soc_dai and snd_soc_dai_link structures. If this is set in either of the DAIs or in the machine then a constraint will be applied when a stream is already open preventing any changes in sample rate. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'include/sound')
-rw-r--r--include/sound/soc-dai.h1
-rw-r--r--include/sound/soc.h6
2 files changed, 7 insertions, 0 deletions
diff --git a/include/sound/soc-dai.h b/include/sound/soc-dai.h
index 13676472ddf..22b729fbbf8 100644
--- a/include/sound/soc-dai.h
+++ b/include/sound/soc-dai.h
@@ -208,6 +208,7 @@ struct snd_soc_dai {
/* DAI capabilities */
struct snd_soc_pcm_stream capture;
struct snd_soc_pcm_stream playback;
+ unsigned int symmetric_rates:1;
/* DAI runtime info */
struct snd_pcm_runtime *runtime;
diff --git a/include/sound/soc.h b/include/sound/soc.h
index a40bc6f316f..b1f2f8819fe 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -417,6 +417,12 @@ struct snd_soc_dai_link {
/* codec/machine specific init - e.g. add machine controls */
int (*init)(struct snd_soc_codec *codec);
+ /* Symmetry requirements */
+ unsigned int symmetric_rates:1;
+
+ /* Symmetry data - only valid if symmetry is being enforced */
+ unsigned int rate;
+
/* DAI pcm */
struct snd_pcm *pcm;
};