141 static int  open(struct tty_struct *tty, struct file * filp);
142 static void close(struct tty_struct *tty, struct file * filp);
143 static void hangup(struct tty_struct *tty);
144 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
146 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
147 static int put_char(struct tty_struct *tty, unsigned char ch);
148 static void send_xchar(struct tty_struct *tty, char ch);
149 static void wait_until_sent(struct tty_struct *tty, int timeout);
150 static int  write_room(struct tty_struct *tty);
151 static void flush_chars(struct tty_struct *tty);
152 static void flush_buffer(struct tty_struct *tty);
153 static void tx_hold(struct tty_struct *tty);
154 static void tx_release(struct tty_struct *tty);
156 static int  ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
157 static int  chars_in_buffer(struct tty_struct *tty);
158 static void throttle(struct tty_struct * tty);
159 static void unthrottle(struct tty_struct * tty);
160 static int set_break(struct tty_struct *tty, int break_state);
442 static int  block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
513 static int  tiocmget(struct tty_struct *tty);
514 static int  tiocmset(struct tty_struct *tty,
516 static int set_break(struct tty_struct *tty, int break_state);
632 static void ldisc_receive_buf(struct tty_struct *tty,  in ldisc_receive_buf()  argument
636 	if (!tty)  in ldisc_receive_buf()
638 	ld = tty_ldisc_ref(tty);  in ldisc_receive_buf()
641 			ld->ops->receive_buf(tty, data, flags, count);  in ldisc_receive_buf()
648 static int open(struct tty_struct *tty, struct file *filp)  in open()  argument
654 	line = tty->index;  in open()
663 	if (sanity_check(info, tty->name, "open"))  in open()
670 	tty->driver_data = info;  in open()
671 	info->port.tty = tty;  in open()
677 		wait_event_interruptible_tty(tty, info->port.close_wait,  in open()
706 	retval = block_til_ready(tty, filp, info);  in open()
716 		if (tty->count == 1)  in open()
717 			info->port.tty = NULL; /* tty layer will release tty struct */  in open()
726 static void close(struct tty_struct *tty, struct file *filp)  in close()  argument
728 	struct slgt_info *info = tty->driver_data;  in close()
730 	if (sanity_check(info, tty->name, "close"))  in close()
734 	if (tty_port_close_start(&info->port, tty, filp) == 0)  in close()
739  		wait_until_sent(tty, info->timeout);  in close()
740 	flush_buffer(tty);  in close()
741 	tty_ldisc_flush(tty);  in close()
746 	tty_port_close_end(&info->port, tty);  in close()
747 	info->port.tty = NULL;  in close()
749 	DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count));  in close()
752 static void hangup(struct tty_struct *tty)  in hangup()  argument
754 	struct slgt_info *info = tty->driver_data;  in hangup()
757 	if (sanity_check(info, tty->name, "hangup"))  in hangup()
761 	flush_buffer(tty);  in hangup()
769 	info->port.tty = NULL;  in hangup()
776 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)  in set_termios()  argument
778 	struct slgt_info *info = tty->driver_data;  in set_termios()
781 	DBGINFO(("%s set_termios\n", tty->driver->name));  in set_termios()
787 	    !(tty->termios.c_cflag & CBAUD)) {  in set_termios()
796 	    tty->termios.c_cflag & CBAUD) {  in set_termios()
798  		if (!(tty->termios.c_cflag & CRTSCTS) ||  in set_termios()
799  		    !test_bit(TTY_THROTTLED, &tty->flags)) {  in set_termios()
809 	    !(tty->termios.c_cflag & CRTSCTS)) {  in set_termios()
810 		tty->hw_stopped = 0;  in set_termios()
811 		tx_release(tty);  in set_termios()
827 static int write(struct tty_struct *tty,  in write()  argument
831 	struct slgt_info *info = tty->driver_data;  in write()
834 	if (sanity_check(info, tty->name, "write"))  in write()
842 	if (!count || tty->stopped || tty->hw_stopped)  in write()
863 static int put_char(struct tty_struct *tty, unsigned char ch)  in put_char()  argument
865 	struct slgt_info *info = tty->driver_data;  in put_char()
869 	if (sanity_check(info, tty->name, "put_char"))  in put_char()
883 static void send_xchar(struct tty_struct *tty, char ch)  in send_xchar()  argument
885 	struct slgt_info *info = tty->driver_data;  in send_xchar()
888 	if (sanity_check(info, tty->name, "send_xchar"))  in send_xchar()
900 static void wait_until_sent(struct tty_struct *tty, int timeout)  in wait_until_sent()  argument
902 	struct slgt_info *info = tty->driver_data;  in wait_until_sent()
907 	if (sanity_check(info, tty->name, "wait_until_sent"))  in wait_until_sent()
942 static int write_room(struct tty_struct *tty)  in write_room()  argument
944 	struct slgt_info *info = tty->driver_data;  in write_room()
947 	if (sanity_check(info, tty->name, "write_room"))  in write_room()
954 static void flush_chars(struct tty_struct *tty)  in flush_chars()  argument
956 	struct slgt_info *info = tty->driver_data;  in flush_chars()
959 	if (sanity_check(info, tty->name, "flush_chars"))  in flush_chars()
963 	if (info->tx_count <= 0 || tty->stopped ||  in flush_chars()
964 	    tty->hw_stopped || !info->tx_buf)  in flush_chars()
975 static void flush_buffer(struct tty_struct *tty)  in flush_buffer()  argument
977 	struct slgt_info *info = tty->driver_data;  in flush_buffer()
980 	if (sanity_check(info, tty->name, "flush_buffer"))  in flush_buffer()
988 	tty_wakeup(tty);  in flush_buffer()
994 static void tx_hold(struct tty_struct *tty)  in tx_hold()  argument
996 	struct slgt_info *info = tty->driver_data;  in tx_hold()
999 	if (sanity_check(info, tty->name, "tx_hold"))  in tx_hold()
1011 static void tx_release(struct tty_struct *tty)  in tx_release()  argument
1013 	struct slgt_info *info = tty->driver_data;  in tx_release()
1016 	if (sanity_check(info, tty->name, "tx_release"))  in tx_release()
1036 static int ioctl(struct tty_struct *tty,  in ioctl()  argument
1039 	struct slgt_info *info = tty->driver_data;  in ioctl()
1043 	if (sanity_check(info, tty->name, "ioctl"))  in ioctl()
1049 		if (tty->flags & (1 << TTY_IO_ERROR))  in ioctl()
1112 static int get_icount(struct tty_struct *tty,  in get_icount()  argument
1116 	struct slgt_info *info = tty->driver_data;  in get_icount()
1200 static long slgt_compat_ioctl(struct tty_struct *tty,  in slgt_compat_ioctl()  argument
1203 	struct slgt_info *info = tty->driver_data;  in slgt_compat_ioctl()
1206 	if (sanity_check(info, tty->name, "compat_ioctl"))  in slgt_compat_ioctl()
1239 		rc = ioctl(tty, cmd, arg);  in slgt_compat_ioctl()
1350 static int chars_in_buffer(struct tty_struct *tty)  in chars_in_buffer()  argument
1352 	struct slgt_info *info = tty->driver_data;  in chars_in_buffer()
1354 	if (sanity_check(info, tty->name, "chars_in_buffer"))  in chars_in_buffer()
1364 static void throttle(struct tty_struct * tty)  in throttle()  argument
1366 	struct slgt_info *info = tty->driver_data;  in throttle()
1369 	if (sanity_check(info, tty->name, "throttle"))  in throttle()
1372 	if (I_IXOFF(tty))  in throttle()
1373 		send_xchar(tty, STOP_CHAR(tty));  in throttle()
1374  	if (tty->termios.c_cflag & CRTSCTS) {  in throttle()
1385 static void unthrottle(struct tty_struct * tty)  in unthrottle()  argument
1387 	struct slgt_info *info = tty->driver_data;  in unthrottle()
1390 	if (sanity_check(info, tty->name, "unthrottle"))  in unthrottle()
1393 	if (I_IXOFF(tty)) {  in unthrottle()
1397 			send_xchar(tty, START_CHAR(tty));  in unthrottle()
1399  	if (tty->termios.c_cflag & CRTSCTS) {  in unthrottle()
1411 static int set_break(struct tty_struct *tty, int break_state)  in set_break()  argument
1413 	struct slgt_info *info = tty->driver_data;  in set_break()
1417 	if (sanity_check(info, tty->name, "set_break"))  in set_break()
2004 	struct tty_struct *tty = info->port.tty;  in bh_transmit()  local
2007 	if (tty)  in bh_transmit()
2008 		tty_wakeup(tty);  in bh_transmit()
2051 		if (info->port.tty) {  in cts_change()
2052 			if (info->port.tty->hw_stopped) {  in cts_change()
2054 		 			info->port.tty->hw_stopped = 0;  in cts_change()
2060 		 			info->port.tty->hw_stopped = 1;  in cts_change()
2097 			if (info->port.tty)  in dcd_change()
2098 				tty_hangup(info->port.tty);  in dcd_change()
2177 			if (info->port.tty) {  in isr_serial()
2182 							do_SAK(info->port.tty);  in isr_serial()
2336 			if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {  in isr_txeom()
2452 	if (info->port.tty)  in startup()
2453 		clear_bit(TTY_IO_ERROR, &info->port.tty->flags);  in startup()
2490  	if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {  in shutdown()
2499 	if (info->port.tty)  in shutdown()
2500 		set_bit(TTY_IO_ERROR, &info->port.tty->flags);  in shutdown()
2531 	    (info->port.tty && info->port.tty->termios.c_cflag & CREAD))  in program_hw()
2545 	if (!info->port.tty)  in change_params()
2549 	cflag = info->port.tty->termios.c_cflag;  in change_params()
2581 	info->params.data_rate = tty_get_baud_rate(info->port.tty);  in change_params()
2602 	if (I_INPCK(info->port.tty))  in change_params()
2604  	if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))  in change_params()
2606 	if (I_IGNPAR(info->port.tty))  in change_params()
2608 	if (I_IGNBRK(info->port.tty)) {  in change_params()
2613 		if (I_IGNPAR(info->port.tty))  in change_params()
3190 static int tiocmget(struct tty_struct *tty)  in tiocmget()  argument
3192 	struct slgt_info *info = tty->driver_data;  in tiocmget()
3218 static int tiocmset(struct tty_struct *tty,  in tiocmset()  argument
3221 	struct slgt_info *info = tty->driver_data;  in tiocmset()
3270 static int block_til_ready(struct tty_struct *tty, struct file *filp,  in block_til_ready()  argument
3280 	DBGINFO(("%s block_til_ready\n", tty->driver->name));  in block_til_ready()
3282 	if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){  in block_til_ready()
3288 	if (tty->termios.c_cflag & CLOCAL)  in block_til_ready()
3307 		if (C_BAUD(tty) && test_bit(ASYNCB_INITIALIZED, &port->flags))  in block_til_ready()
3328 		DBGINFO(("%s block_til_ready wait\n", tty->driver->name));  in block_til_ready()
3329 		tty_unlock(tty);  in block_til_ready()
3331 		tty_lock(tty);  in block_til_ready()
3344 	DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));  in block_til_ready()
4656 	struct tty_struct *tty = info->port.tty;  in rx_get_frame()  local
4773 				ldisc_receive_buf(tty, info->tmp_rbuf, info->flag_buf, framesize);  in rx_get_frame()
4807 		ldisc_receive_buf(info->port.tty, info->rbufs[i].buf,  in rx_get_buf()
4994 	struct tty_struct *oldtty = info->port.tty;  in irq_test()
4998 	info->port.tty = NULL;  in irq_test()
5026 	info->port.tty = oldtty;  in irq_test()
5066 	struct tty_struct *oldtty = info->port.tty;  in loopback_test()
5074 	info->port.tty = NULL;  in loopback_test()
5110 	info->port.tty = oldtty;  in loopback_test()