eb66710bf4c
parent 305787649826d6c84a6f9f71bc3318460610aba4
author Peter Ujfalusi <peter.ujfalusi@nokia.com> 1273230349 +0300
committer Mark Brown <broonie@opensource.wolfsonmicro.com> 1273246893 +0100

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>
:GZAŸ