AUD_INT_MCHG_IRQ   68 drivers/media/pci/cx23885/cx23885-alsa.c #define AUD_INT_MCHG_IRQ        (1 << 21)
AUD_INT_MCHG_IRQ  128 drivers/media/pci/cx25821/cx25821-alsa.c #define AUD_INT_MCHG_IRQ        (1 << 21)
AUD_INT_MCHG_IRQ  617 drivers/media/pci/cx88/cx88-reg.h #define AUD_INT_MCHG_IRQ	(1 << 21)