snd_ca0106_pcm_open_capture_channel
return snd_ca0106_pcm_open_capture_channel(substream, 0);
return snd_ca0106_pcm_open_capture_channel(substream, 1);
return snd_ca0106_pcm_open_capture_channel(substream, 2);
return snd_ca0106_pcm_open_capture_channel(substream, 3);