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authorPeter Ujfalusi <peter.ujfalusi@nokia.com>2010-05-07 14:05:49 +0300
committerMark Brown <broonie@opensource.wolfsonmicro.com>2010-05-07 16:41:33 +0100
commit637d3847ba0ca2c7780e6521cbe75568d19ff0db (patch)
tree6a9b76e2d0365cabba43f7a273feceb66710bf4c /include/sound
parent305787649826d6c84a6f9f71bc3318460610aba4 (diff)
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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.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/sound/soc.h b/include/sound/soc.h
index 01e9c66ddc6..9f306f0710d 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