snd_ca0106_pcm_power_dac
snd_ca0106_pcm_power_dac(chip, PCM_FRONT_CHANNEL, 1);
err = snd_ca0106_pcm_power_dac(chip, channel_id, 1);
err = snd_ca0106_pcm_power_dac(chip, epcm->channel_id, 0);