Peter Ujfalusi 637d3847ba
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 >
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637d3847ba