static unsigned int __wait_latch(u16 port, u8 val)
static int __wait_latch(u16 port, u8 val)
static unsigned int __wait_latch(u16 port, u8 val){	unsigned int i;	for (i = 0; i < 20; i++) {		if (!__check_latch(port, val))			return 0;		udelay(5);	}	return -EINVAL;}