struct serport *sp = (struct serport *) tty->disc_data;
struct serport *serport = (struct serport *) tty->disc_data; unsigned long flags;
static void serport_ldisc_write_wakeup(struct tty_struct * tty){	struct serport *sp = (struct serport *) tty->disc_data;	serio_drv_write_wakeup(sp->serio);}