MFPR_EDGE_FALL     39 arch/arm/plat-pxa/mfp.c #define MFPR_EDGE_BOTH		(MFPR_EDGE_RISE | MFPR_EDGE_FALL)
MFPR_EDGE_FALL    125 arch/arm/plat-pxa/mfp.c 	MFPR_EDGE_FALL,