static int ntty_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg) {
port_t *port = (port_t *) tty->driver_data;
static int ntty_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg) {
port_t *port = (port_t *) tty->driver_data;