SOUND_MIXER_MIC   826 include/uapi/linux/soundcard.h #define SOUND_MASK_MIC		(1 << SOUND_MIXER_MIC)
SOUND_MIXER_MIC   858 include/uapi/linux/soundcard.h #define SOUND_MIXER_READ_MIC		MIXER_READ(SOUND_MIXER_MIC)
SOUND_MIXER_MIC   888 include/uapi/linux/soundcard.h #define SOUND_MIXER_WRITE_MIC		MIXER_WRITE(SOUND_MIXER_MIC)