SOUND_MIXER_PCM   823 include/uapi/linux/soundcard.h #define SOUND_MASK_PCM		(1 << SOUND_MIXER_PCM)
SOUND_MIXER_PCM   855 include/uapi/linux/soundcard.h #define SOUND_MIXER_READ_PCM		MIXER_READ(SOUND_MIXER_PCM)
SOUND_MIXER_PCM   885 include/uapi/linux/soundcard.h #define SOUND_MIXER_WRITE_PCM		MIXER_WRITE(SOUND_MIXER_PCM)