ATKBD_RET_ACK
ATKBD_RET_BAT, ATKBD_RET_ERR, ATKBD_RET_ACK,
if (!flags && data == ATKBD_RET_ACK)
case ATKBD_RET_ACK:
data == ATKBD_RET_ACK ? "ACK" : "NAK", serio->phys);