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| author | Peter Ujfalusi <peter.ujfalusi@nokia.com> | 2010-05-07 13:05:49 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2010-05-07 17:41:33 +0200 |
| commit | 637d3847ba0ca2c7780e6521cbe75568d19ff0db (patch) | |
| tree | 6a9b76e2d0365cabba43f7a273feceb66710bf4c /include/sound | |
| parent | Merge branch 'topic/asoc' of git://git.kernel.org/pub/scm/linux/kernel/git/ti... (diff) | |
| download | linux-637d3847ba0ca2c7780e6521cbe75568d19ff0db.tar.xz linux-637d3847ba0ca2c7780e6521cbe75568d19ff0db.zip | |
ASoC: core: Support for limiting the volume
Add support for the core to limit the maximum volume on an
existing control.
The function will modify the soc_mixer_control.max value
of the given control.
The new value must be lower than the original one (chip maximum)
If there is a need for limiting a gain on a given control,
than machine drivers can do the following in their
snd_soc_dai_link.init function:
snd_soc_limit_volume(codec, "TPA6140A2 Headphone Playback Volume", 21);
This will modify the original 31 (chip maximum) to 21, so user
space will not be able to set the gain higher than this.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'include/sound')
| -rw-r--r-- | include/sound/soc.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/sound/soc.h b/include/sound/soc.h index 01e9c66ddc6d..9f306f0710df 100644 --- a/include/sound/soc.h +++ b/include/sound/soc.h @@ -326,6 +326,8 @@ int snd_soc_get_volsw_s8(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol); int snd_soc_put_volsw_s8(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol); +int snd_soc_limit_volume(struct snd_soc_codec *codec, + const char *name, int max); /** * struct snd_soc_jack_pin - Describes a pin to update based on jack detection |