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authorMark Brown <broonie@opensource.wolfsonmicro.com>2012-01-16 18:38:51 +0000
committerMark Brown <broonie@opensource.wolfsonmicro.com>2012-01-20 13:58:29 +0000
commit58ba9b25454fe9b6ded804f69cb7ed4500b685fc (patch)
treea1fe526353caf7c79cf21c8763e9e86117c981d4 /include/sound
parent5f52ee48751e63ed555b56a82db446745f60bc82 (diff)
ASoC: Allow drivers to specify how many bits are significant on a DAI
Most devices accept data in formats that don't correspond directly to their internal format. ALSA allows us to set a msbits constraint which tells userspace about this in case it finds it useful (for example, in order to avoid wasting effort dithering bits that will be ignored when raising the sample size of data) so provide a mechanism for drivers to specify the number of bits that are actually significant on a DAI and add the appropriate constraints along with all the others. This is done slightly awkwardly as the constraint is specified per sample size - we loop over every possible sample size, including ones that the device doesn't support and including ones that have fewer bits than are actually used, but this is harmless as the upper layers do the right thing in these cases. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Liam Girdwood <lrg@ti.com>
Diffstat (limited to 'include/sound')
-rw-r--r--include/sound/soc.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/sound/soc.h b/include/sound/soc.h
index 0992dff5595..55381fca6e0 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -505,6 +505,7 @@ 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 sig_bits; /* number of bits of content */
};
/* SoC audio ops */