taglinefilesource code
SOUND_MIXER_LINE2104drivers/sound/ad1848_mixer.hMIX_ENT(SOUND_MIXER_LINE2,   4, 1, 0, 5,   5, 1, 0, 5),
SOUND_MIXER_LINE2737include/linux/soundcard.h#define SOUND_MASK_LINE2  (1 << SOUND_MIXER_LINE2)
SOUND_MIXER_LINE2760include/linux/soundcard.h#define SOUND_MIXER_READ_LINE2    MIXER_READ(SOUND_MIXER_LINE2)
SOUND_MIXER_LINE2788include/linux/soundcard.h#define SOUND_MIXER_WRITE_LINE2    MIXER_WRITE(SOUND_MIXER_LINE2)