SOUND_MIXER_CD 827 include/uapi/linux/soundcard.h #define SOUND_MASK_CD (1 << SOUND_MIXER_CD) SOUND_MIXER_CD 859 include/uapi/linux/soundcard.h #define SOUND_MIXER_READ_CD MIXER_READ(SOUND_MIXER_CD) SOUND_MIXER_CD 889 include/uapi/linux/soundcard.h #define SOUND_MIXER_WRITE_CD MIXER_WRITE(SOUND_MIXER_CD) SOUND_MIXER_CD 1272 sound/core/oss/mixer_oss.c { SOUND_MIXER_CD, "CD", 0 },