ASoC: SOF: refine sof for multi-channels support#39
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User mode lib calls info function in kcontrol to get the channel number of
volume mixer. The default info function is snd_soc_info_volsw which only
supports max two channels. Just like get/put function, info function is
bound to a bespoke info function in SOF and return correct channel number
to user.
The snd_sof_volume_info is based on snd_soc_info_volsw, and refines the
channel setting. Using standard SND_SOC_TPLG_CTL_VOLSW to register our
kcontrol function because only it supports binding all kcontrol functions to bespoke
ones. And this change doesn't affect the volume mixer which is not created by
topology and doesn't affect the topology released
Signed-off-by: Rander Wang rander.wang@linux.intel.com