tag	line	file	source code
INPUT_AVAIL	94	drivers/sound/mpu401.c	#define  INPUT_AVAIL  0x80
INPUT_AVAIL	50	drivers/sound/sb16_midi.c	#define  INPUT_AVAIL  0x80
INPUT_AVAIL	54	drivers/sound/uart6850.c	#define  INPUT_AVAIL  0x01  /*