DSP_PCM_MAIN_CHANNEL
if (cpcm->pcm_channel_id == DSP_PCM_MAIN_CHANNEL) {
if (cpcm->pcm_channel_id == DSP_PCM_MAIN_CHANNEL) {
return _cs46xx_playback_open_channel(substream,DSP_PCM_MAIN_CHANNEL);
case DSP_PCM_MAIN_CHANNEL: