366 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty);
402 static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty);
413 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty);
419 static int tiocmget(struct tty_struct *tty);
420 static int tiocmset(struct tty_struct *tty,
424 static int set_params(MGSLPC_INFO *info, MGSL_PARAMS __user *new_params, struct tty_struct *tty);
427 static int set_txenable(MGSLPC_INFO *info, int enable, struct tty_struct *tty);
466 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty);
467 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout);
495 static void ldisc_receive_buf(struct tty_struct *tty,  in ldisc_receive_buf()  argument
499 	if (!tty)  in ldisc_receive_buf()
501 	ld = tty_ldisc_ref(tty);  in ldisc_receive_buf()
504 			ld->ops->receive_buf(tty, data, flags, count);  in ldisc_receive_buf()
704 static void tx_pause(struct tty_struct *tty)  in tx_pause()  argument
706 	MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;  in tx_pause()
709 	if (mgslpc_paranoia_check(info, tty->name, "tx_pause"))  in tx_pause()
720 static void tx_release(struct tty_struct *tty)  in tx_release()  argument
722 	MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;  in tx_release()
725 	if (mgslpc_paranoia_check(info, tty->name, "tx_release"))  in tx_release()
732 		tx_start(info, tty);  in tx_release()
771 	struct tty_struct *tty;  in bh_handler()  local
779 	tty = tty_port_tty_get(&info->port);  in bh_handler()
791 			while(rx_get_frame(info, tty));  in bh_handler()
794 			bh_transmit(info, tty);  in bh_handler()
806 	tty_kref_put(tty);  in bh_handler()
812 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty)  in bh_transmit()  argument
817 	if (tty)  in bh_transmit()
818 		tty_wakeup(tty);  in bh_transmit()
961 static void tx_done(MGSLPC_INFO *info, struct tty_struct *tty)  in tx_done()  argument
990 		if (tty && (tty->stopped || tty->hw_stopped)) {  in tx_done()
998 static void tx_ready(MGSLPC_INFO *info, struct tty_struct *tty)  in tx_ready()  argument
1010 		if (tty && (tty->stopped || tty->hw_stopped)) {  in tx_ready()
1047 static void cts_change(MGSLPC_INFO *info, struct tty_struct *tty)  in cts_change()  argument
1060 	if (tty && tty_port_cts_enabled(&info->port)) {  in cts_change()
1061 		if (tty->hw_stopped) {  in cts_change()
1065 				tty->hw_stopped = 0;  in cts_change()
1066 				tx_start(info, tty);  in cts_change()
1074 				tty->hw_stopped = 1;  in cts_change()
1082 static void dcd_change(MGSLPC_INFO *info, struct tty_struct *tty)  in dcd_change()  argument
1113 			if (tty)  in dcd_change()
1114 				tty_hangup(tty);  in dcd_change()
1160 	struct tty_struct *tty;  in mgslpc_isr()  local
1171 	tty = tty_port_tty_get(&info->port);  in mgslpc_isr()
1188 				dcd_change(info, tty);  in mgslpc_isr()
1190 				cts_change(info, tty);  in mgslpc_isr()
1208 					do_SAK(tty);  in mgslpc_isr()
1226 				tx_done(info, tty);  in mgslpc_isr()
1230 				tx_done(info, tty);  in mgslpc_isr()
1233 				tx_ready(info, tty);  in mgslpc_isr()
1257 	tty_kref_put(tty);  in mgslpc_isr()
1268 static int startup(MGSLPC_INFO * info, struct tty_struct *tty)  in startup()  argument
1302 		if (capable(CAP_SYS_ADMIN) && tty)  in startup()
1303 			set_bit(TTY_IO_ERROR, &tty->flags);  in startup()
1309 	mgslpc_change_params(info, tty);  in startup()
1311 	if (tty)  in startup()
1312 		clear_bit(TTY_IO_ERROR, &tty->flags);  in startup()
1321 static void shutdown(MGSLPC_INFO * info, struct tty_struct *tty)  in shutdown()  argument
1352 	if (!tty || tty->termios.c_cflag & HUPCL) {  in shutdown()
1361 	if (tty)  in shutdown()
1362 		set_bit(TTY_IO_ERROR, &tty->flags);  in shutdown()
1367 static void mgslpc_program_hw(MGSLPC_INFO *info, struct tty_struct *tty)  in mgslpc_program_hw()  argument
1393 	if (info->netcount || (tty && (tty->termios.c_cflag & CREAD)))  in mgslpc_program_hw()
1401 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty)  in mgslpc_change_params()  argument
1406 	if (!tty)  in mgslpc_change_params()
1413 	cflag = tty->termios.c_cflag;  in mgslpc_change_params()
1460 		info->params.data_rate = tty_get_baud_rate(tty);  in mgslpc_change_params()
1482 	if (I_INPCK(tty))  in mgslpc_change_params()
1484 	if (I_IGNPAR(tty))  in mgslpc_change_params()
1487 	mgslpc_program_hw(info, tty);  in mgslpc_change_params()
1492 static int mgslpc_put_char(struct tty_struct *tty, unsigned char ch)  in mgslpc_put_char()  argument
1494 	MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;  in mgslpc_put_char()
1502 	if (mgslpc_paranoia_check(info, tty->name, "mgslpc_put_char"))  in mgslpc_put_char()
1525 static void mgslpc_flush_chars(struct tty_struct *tty)  in mgslpc_flush_chars()  argument
1527 	MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;  in mgslpc_flush_chars()
1534 	if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_chars"))  in mgslpc_flush_chars()
1537 	if (info->tx_count <= 0 || tty->stopped ||  in mgslpc_flush_chars()
1538 	    tty->hw_stopped || !info->tx_buf)  in mgslpc_flush_chars()
1547 		tx_start(info, tty);  in mgslpc_flush_chars()
1561 static int mgslpc_write(struct tty_struct * tty,  in mgslpc_write()  argument
1565 	MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;  in mgslpc_write()
1572 	if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write") ||  in mgslpc_write()
1606 	if (info->tx_count && !tty->stopped && !tty->hw_stopped) {  in mgslpc_write()
1609 			tx_start(info, tty);  in mgslpc_write()
1621 static int mgslpc_write_room(struct tty_struct *tty)  in mgslpc_write_room()  argument
1623 	MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;  in mgslpc_write_room()
1626 	if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write_room"))  in mgslpc_write_room()
1649 static int mgslpc_chars_in_buffer(struct tty_struct *tty)  in mgslpc_chars_in_buffer()  argument
1651 	MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;  in mgslpc_chars_in_buffer()
1658 	if (mgslpc_paranoia_check(info, tty->name, "mgslpc_chars_in_buffer"))  in mgslpc_chars_in_buffer()
1675 static void mgslpc_flush_buffer(struct tty_struct *tty)  in mgslpc_flush_buffer()  argument
1677 	MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;  in mgslpc_flush_buffer()
1684 	if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_buffer"))  in mgslpc_flush_buffer()
1692 	wake_up_interruptible(&tty->write_wait);  in mgslpc_flush_buffer()
1693 	tty_wakeup(tty);  in mgslpc_flush_buffer()
1698 static void mgslpc_send_xchar(struct tty_struct *tty, char ch)  in mgslpc_send_xchar()  argument
1700 	MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;  in mgslpc_send_xchar()
1707 	if (mgslpc_paranoia_check(info, tty->name, "mgslpc_send_xchar"))  in mgslpc_send_xchar()
1714 			tx_start(info, tty);  in mgslpc_send_xchar()
1721 static void mgslpc_throttle(struct tty_struct * tty)  in mgslpc_throttle()  argument
1723 	MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;  in mgslpc_throttle()
1730 	if (mgslpc_paranoia_check(info, tty->name, "mgslpc_throttle"))  in mgslpc_throttle()
1733 	if (I_IXOFF(tty))  in mgslpc_throttle()
1734 		mgslpc_send_xchar(tty, STOP_CHAR(tty));  in mgslpc_throttle()
1736 	if (tty->termios.c_cflag & CRTSCTS) {  in mgslpc_throttle()
1746 static void mgslpc_unthrottle(struct tty_struct * tty)  in mgslpc_unthrottle()  argument
1748 	MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;  in mgslpc_unthrottle()
1755 	if (mgslpc_paranoia_check(info, tty->name, "mgslpc_unthrottle"))  in mgslpc_unthrottle()
1758 	if (I_IXOFF(tty)) {  in mgslpc_unthrottle()
1762 			mgslpc_send_xchar(tty, START_CHAR(tty));  in mgslpc_unthrottle()
1765 	if (tty->termios.c_cflag & CRTSCTS) {  in mgslpc_unthrottle()
1812 static int set_params(MGSLPC_INFO * info, MGSL_PARAMS __user *new_params, struct tty_struct *tty)  in set_params()  argument
1833 	mgslpc_change_params(info, tty);  in set_params()
1894 static int set_txenable(MGSLPC_INFO * info, int enable, struct tty_struct *tty)  in set_txenable()  argument
1904 			tx_start(info, tty);  in set_txenable()
2121 static int tiocmget(struct tty_struct *tty)  in tiocmget()  argument
2123 	MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;  in tiocmget()
2146 static int tiocmset(struct tty_struct *tty,  in tiocmset()  argument
2149 	MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;  in tiocmset()
2177 static int mgslpc_break(struct tty_struct *tty, int break_state)  in mgslpc_break()  argument
2179 	MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;  in mgslpc_break()
2186 	if (mgslpc_paranoia_check(info, tty->name, "mgslpc_break"))  in mgslpc_break()
2198 static int mgslpc_get_icount(struct tty_struct *tty,  in mgslpc_get_icount()  argument
2201 	MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;  in mgslpc_get_icount()
2234 static int mgslpc_ioctl(struct tty_struct *tty,  in mgslpc_ioctl()  argument
2237 	MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;  in mgslpc_ioctl()
2244 	if (mgslpc_paranoia_check(info, tty->name, "mgslpc_ioctl"))  in mgslpc_ioctl()
2249 		if (tty->flags & (1 << TTY_IO_ERROR))  in mgslpc_ioctl()
2257 		return set_params(info, argp, tty);  in mgslpc_ioctl()
2267 		return set_txenable(info,(int)arg, tty);  in mgslpc_ioctl()
2291 static void mgslpc_set_termios(struct tty_struct *tty, struct ktermios *old_termios)  in mgslpc_set_termios()  argument
2293 	MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;  in mgslpc_set_termios()
2298 			tty->driver->name);  in mgslpc_set_termios()
2301 	if ((tty->termios.c_cflag == old_termios->c_cflag)  in mgslpc_set_termios()
2302 	    && (RELEVANT_IFLAG(tty->termios.c_iflag)  in mgslpc_set_termios()
2306 	mgslpc_change_params(info, tty);  in mgslpc_set_termios()
2310 	    !(tty->termios.c_cflag & CBAUD)) {  in mgslpc_set_termios()
2319 	    tty->termios.c_cflag & CBAUD) {  in mgslpc_set_termios()
2321 		if (!(tty->termios.c_cflag & CRTSCTS) ||  in mgslpc_set_termios()
2322 		    !test_bit(TTY_THROTTLED, &tty->flags)) {  in mgslpc_set_termios()
2332 	    !(tty->termios.c_cflag & CRTSCTS)) {  in mgslpc_set_termios()
2333 		tty->hw_stopped = 0;  in mgslpc_set_termios()
2334 		tx_release(tty);  in mgslpc_set_termios()
2338 static void mgslpc_close(struct tty_struct *tty, struct file * filp)  in mgslpc_close()  argument
2340 	MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;  in mgslpc_close()
2343 	if (mgslpc_paranoia_check(info, tty->name, "mgslpc_close"))  in mgslpc_close()
2350 	if (tty_port_close_start(port, tty, filp) == 0)  in mgslpc_close()
2354 		mgslpc_wait_until_sent(tty, info->timeout);  in mgslpc_close()
2356 	mgslpc_flush_buffer(tty);  in mgslpc_close()
2358 	tty_ldisc_flush(tty);  in mgslpc_close()
2359 	shutdown(info, tty);  in mgslpc_close()
2361 	tty_port_close_end(port, tty);  in mgslpc_close()
2366 			tty->driver->name, port->count);  in mgslpc_close()
2371 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout)  in mgslpc_wait_until_sent()  argument
2373 	MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;  in mgslpc_wait_until_sent()
2383 	if (mgslpc_paranoia_check(info, tty->name, "mgslpc_wait_until_sent"))  in mgslpc_wait_until_sent()
2435 static void mgslpc_hangup(struct tty_struct *tty)  in mgslpc_hangup()  argument
2437 	MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;  in mgslpc_hangup()
2443 	if (mgslpc_paranoia_check(info, tty->name, "mgslpc_hangup"))  in mgslpc_hangup()
2446 	mgslpc_flush_buffer(tty);  in mgslpc_hangup()
2447 	shutdown(info, tty);  in mgslpc_hangup()
2480 static int mgslpc_open(struct tty_struct *tty, struct file * filp)  in mgslpc_open()  argument
2488 	line = tty->index;  in mgslpc_open()
2499 	if (mgslpc_paranoia_check(info, tty->name, "mgslpc_open"))  in mgslpc_open()
2503 	tty->driver_data = info;  in mgslpc_open()
2504 	tty_port_tty_set(port, tty);  in mgslpc_open()
2508 			 __FILE__, __LINE__, tty->driver->name, port->count);  in mgslpc_open()
2512 		wait_event_interruptible_tty(tty, port->close_wait,  in mgslpc_open()
2534 		retval = startup(info, tty);  in mgslpc_open()
2539 	retval = tty_port_block_til_ready(&info->port, tty, filp);  in mgslpc_open()
3319 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty)  in tx_start()  argument
3343 				tx_ready(info, tty);  in tx_start()
3347 			tx_ready(info, tty);  in tx_start()
3668 static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty)  in rx_get_frame()  argument
3737 				ldisc_receive_buf(tty, buf->data, info->flag_buf, framesize);  in rx_get_frame()
3894 		struct tty_struct *tty = tty_port_tty_get(&info->port);  in tx_timeout()  local
3895 		bh_transmit(info, tty);  in tx_timeout()
3896 		tty_kref_put(tty);  in tx_timeout()
3916 	struct tty_struct *tty;  in hdlcdev_attach()  local
3947 		tty = tty_port_tty_get(&info->port);  in hdlcdev_attach()
3948 		mgslpc_program_hw(info, tty);  in hdlcdev_attach()
3949 		tty_kref_put(tty);  in hdlcdev_attach()
3991 		struct tty_struct *tty = tty_port_tty_get(&info->port);  in hdlcdev_xmit()  local
3992 		tx_start(info, tty);  in hdlcdev_xmit()
3993 		tty_kref_put(tty);  in hdlcdev_xmit()
4011 	struct tty_struct *tty;  in hdlcdev_open()  local
4033 	tty = tty_port_tty_get(&info->port);  in hdlcdev_open()
4035 	rc = startup(info, tty);  in hdlcdev_open()
4037 		tty_kref_put(tty);  in hdlcdev_open()
4045 	mgslpc_program_hw(info, tty);  in hdlcdev_open()
4046 	tty_kref_put(tty);  in hdlcdev_open()
4074 	struct tty_struct *tty = tty_port_tty_get(&info->port);  in hdlcdev_close()  local
4083 	shutdown(info, tty);  in hdlcdev_close()
4084 	tty_kref_put(tty);  in hdlcdev_close()
4191 			struct tty_struct *tty = tty_port_tty_get(&info->port);  in hdlcdev_ioctl()  local
4192 			mgslpc_program_hw(info, tty);  in hdlcdev_ioctl()
4193 			tty_kref_put(tty);  in hdlcdev_ioctl()