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()
697 	retval = block_til_ready(tty, filp, info);  in open()
707 		if (tty->count == 1)  in open()
708 			info->port.tty = NULL; /* tty layer will release tty struct */  in open()
717 static void close(struct tty_struct *tty, struct file *filp)  in close()  argument
719 	struct slgt_info *info = tty->driver_data;  in close()
721 	if (sanity_check(info, tty->name, "close"))  in close()
725 	if (tty_port_close_start(&info->port, tty, filp) == 0)  in close()
730  		wait_until_sent(tty, info->timeout);  in close()
731 	flush_buffer(tty);  in close()
732 	tty_ldisc_flush(tty);  in close()
737 	tty_port_close_end(&info->port, tty);  in close()
738 	info->port.tty = NULL;  in close()
740 	DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count));  in close()
743 static void hangup(struct tty_struct *tty)  in hangup()  argument
745 	struct slgt_info *info = tty->driver_data;  in hangup()
748 	if (sanity_check(info, tty->name, "hangup"))  in hangup()
752 	flush_buffer(tty);  in hangup()
760 	info->port.tty = NULL;  in hangup()
767 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)  in set_termios()  argument
769 	struct slgt_info *info = tty->driver_data;  in set_termios()
772 	DBGINFO(("%s set_termios\n", tty->driver->name));  in set_termios()
778 	    !(tty->termios.c_cflag & CBAUD)) {  in set_termios()
787 	    tty->termios.c_cflag & CBAUD) {  in set_termios()
789  		if (!(tty->termios.c_cflag & CRTSCTS) ||  in set_termios()
790  		    !test_bit(TTY_THROTTLED, &tty->flags)) {  in set_termios()
800 	    !(tty->termios.c_cflag & CRTSCTS)) {  in set_termios()
801 		tty->hw_stopped = 0;  in set_termios()
802 		tx_release(tty);  in set_termios()
818 static int write(struct tty_struct *tty,  in write()  argument
822 	struct slgt_info *info = tty->driver_data;  in write()
825 	if (sanity_check(info, tty->name, "write"))  in write()
833 	if (!count || tty->stopped || tty->hw_stopped)  in write()
854 static int put_char(struct tty_struct *tty, unsigned char ch)  in put_char()  argument
856 	struct slgt_info *info = tty->driver_data;  in put_char()
860 	if (sanity_check(info, tty->name, "put_char"))  in put_char()
874 static void send_xchar(struct tty_struct *tty, char ch)  in send_xchar()  argument
876 	struct slgt_info *info = tty->driver_data;  in send_xchar()
879 	if (sanity_check(info, tty->name, "send_xchar"))  in send_xchar()
891 static void wait_until_sent(struct tty_struct *tty, int timeout)  in wait_until_sent()  argument
893 	struct slgt_info *info = tty->driver_data;  in wait_until_sent()
898 	if (sanity_check(info, tty->name, "wait_until_sent"))  in wait_until_sent()
933 static int write_room(struct tty_struct *tty)  in write_room()  argument
935 	struct slgt_info *info = tty->driver_data;  in write_room()
938 	if (sanity_check(info, tty->name, "write_room"))  in write_room()
945 static void flush_chars(struct tty_struct *tty)  in flush_chars()  argument
947 	struct slgt_info *info = tty->driver_data;  in flush_chars()
950 	if (sanity_check(info, tty->name, "flush_chars"))  in flush_chars()
954 	if (info->tx_count <= 0 || tty->stopped ||  in flush_chars()
955 	    tty->hw_stopped || !info->tx_buf)  in flush_chars()
966 static void flush_buffer(struct tty_struct *tty)  in flush_buffer()  argument
968 	struct slgt_info *info = tty->driver_data;  in flush_buffer()
971 	if (sanity_check(info, tty->name, "flush_buffer"))  in flush_buffer()
979 	tty_wakeup(tty);  in flush_buffer()
985 static void tx_hold(struct tty_struct *tty)  in tx_hold()  argument
987 	struct slgt_info *info = tty->driver_data;  in tx_hold()
990 	if (sanity_check(info, tty->name, "tx_hold"))  in tx_hold()
1002 static void tx_release(struct tty_struct *tty)  in tx_release()  argument
1004 	struct slgt_info *info = tty->driver_data;  in tx_release()
1007 	if (sanity_check(info, tty->name, "tx_release"))  in tx_release()
1027 static int ioctl(struct tty_struct *tty,  in ioctl()  argument
1030 	struct slgt_info *info = tty->driver_data;  in ioctl()
1034 	if (sanity_check(info, tty->name, "ioctl"))  in ioctl()
1040 		if (tty->flags & (1 << TTY_IO_ERROR))  in ioctl()
1103 static int get_icount(struct tty_struct *tty,  in get_icount()  argument
1107 	struct slgt_info *info = tty->driver_data;  in get_icount()
1191 static long slgt_compat_ioctl(struct tty_struct *tty,  in slgt_compat_ioctl()  argument
1194 	struct slgt_info *info = tty->driver_data;  in slgt_compat_ioctl()
1197 	if (sanity_check(info, tty->name, "compat_ioctl"))  in slgt_compat_ioctl()
1230 		rc = ioctl(tty, cmd, arg);  in slgt_compat_ioctl()
1341 static int chars_in_buffer(struct tty_struct *tty)  in chars_in_buffer()  argument
1343 	struct slgt_info *info = tty->driver_data;  in chars_in_buffer()
1345 	if (sanity_check(info, tty->name, "chars_in_buffer"))  in chars_in_buffer()
1355 static void throttle(struct tty_struct * tty)  in throttle()  argument
1357 	struct slgt_info *info = tty->driver_data;  in throttle()
1360 	if (sanity_check(info, tty->name, "throttle"))  in throttle()
1363 	if (I_IXOFF(tty))  in throttle()
1364 		send_xchar(tty, STOP_CHAR(tty));  in throttle()
1365  	if (tty->termios.c_cflag & CRTSCTS) {  in throttle()
1376 static void unthrottle(struct tty_struct * tty)  in unthrottle()  argument
1378 	struct slgt_info *info = tty->driver_data;  in unthrottle()
1381 	if (sanity_check(info, tty->name, "unthrottle"))  in unthrottle()
1384 	if (I_IXOFF(tty)) {  in unthrottle()
1388 			send_xchar(tty, START_CHAR(tty));  in unthrottle()
1390  	if (tty->termios.c_cflag & CRTSCTS) {  in unthrottle()
1402 static int set_break(struct tty_struct *tty, int break_state)  in set_break()  argument
1404 	struct slgt_info *info = tty->driver_data;  in set_break()
1408 	if (sanity_check(info, tty->name, "set_break"))  in set_break()
1999 	struct tty_struct *tty = info->port.tty;  in bh_transmit()  local
2002 	if (tty)  in bh_transmit()
2003 		tty_wakeup(tty);  in bh_transmit()
2046 		if (info->port.tty) {  in cts_change()
2047 			if (info->port.tty->hw_stopped) {  in cts_change()
2049 		 			info->port.tty->hw_stopped = 0;  in cts_change()
2055 		 			info->port.tty->hw_stopped = 1;  in cts_change()
2092 			if (info->port.tty)  in dcd_change()
2093 				tty_hangup(info->port.tty);  in dcd_change()
2172 			if (info->port.tty) {  in isr_serial()
2177 							do_SAK(info->port.tty);  in isr_serial()
2331 			if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {  in isr_txeom()
2447 	if (info->port.tty)  in startup()
2448 		clear_bit(TTY_IO_ERROR, &info->port.tty->flags);  in startup()
2485  	if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {  in shutdown()
2494 	if (info->port.tty)  in shutdown()
2495 		set_bit(TTY_IO_ERROR, &info->port.tty->flags);  in shutdown()
2526 	    (info->port.tty && info->port.tty->termios.c_cflag & CREAD))  in program_hw()
2540 	if (!info->port.tty)  in change_params()
2544 	cflag = info->port.tty->termios.c_cflag;  in change_params()
2576 	info->params.data_rate = tty_get_baud_rate(info->port.tty);  in change_params()
2597 	if (I_INPCK(info->port.tty))  in change_params()
2599  	if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))  in change_params()
2601 	if (I_IGNPAR(info->port.tty))  in change_params()
2603 	if (I_IGNBRK(info->port.tty)) {  in change_params()
2608 		if (I_IGNPAR(info->port.tty))  in change_params()
3185 static int tiocmget(struct tty_struct *tty)  in tiocmget()  argument
3187 	struct slgt_info *info = tty->driver_data;  in tiocmget()
3213 static int tiocmset(struct tty_struct *tty,  in tiocmset()  argument
3216 	struct slgt_info *info = tty->driver_data;  in tiocmset()
3265 static int block_til_ready(struct tty_struct *tty, struct file *filp,  in block_til_ready()  argument
3275 	DBGINFO(("%s block_til_ready\n", tty->driver->name));  in block_til_ready()
3277 	if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){  in block_til_ready()
3283 	if (tty->termios.c_cflag & CLOCAL)  in block_til_ready()
3302 		if (C_BAUD(tty) && test_bit(ASYNCB_INITIALIZED, &port->flags))  in block_til_ready()
3322 		DBGINFO(("%s block_til_ready wait\n", tty->driver->name));  in block_til_ready()
3323 		tty_unlock(tty);  in block_til_ready()
3325 		tty_lock(tty);  in block_til_ready()
3338 	DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));  in block_til_ready()
4651 	struct tty_struct *tty = info->port.tty;  in rx_get_frame()  local
4768 				ldisc_receive_buf(tty, info->tmp_rbuf, info->flag_buf, framesize);  in rx_get_frame()
4802 		ldisc_receive_buf(info->port.tty, info->rbufs[i].buf,  in rx_get_buf()
4989 	struct tty_struct *oldtty = info->port.tty;  in irq_test()
4993 	info->port.tty = NULL;  in irq_test()
5021 	info->port.tty = oldtty;  in irq_test()
5061 	struct tty_struct *oldtty = info->port.tty;  in loopback_test()
5069 	info->port.tty = NULL;  in loopback_test()
5105 	info->port.tty = oldtty;  in loopback_test()