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)