decode_bits
decode_bits(KERN_DEBUG "ISR", isr_bits, ARRAY_SIZE(isr_bits), val);
decode_bits(KERN_DEBUG "ICR", icr_bits, ARRAY_SIZE(icr_bits), val);
a = decode_bits(src[0]);
b = decode_bits(src[1]);
c = decode_bits(src[2]);
d = decode_bits(src[3]);