Private info for specified board
Channel whose stereo setting will be adjusted
New sample size, use the AFMT_xxx constants
Helper function for the SNDCTL_DSP_CHANNELS and SNDCTL_DSP_STEREO ioctls. OSS semantics demand that all audio operations halt (if they are not already halted) when SNDCTL_DSP_CHANNELS or SNDCTL_DSP_STEREO is given.
This function halts all audio operations for the given channel chan, and then calls via_chan_pcm_fmt to set the audio hardware to enable or disable stereo.