21 	struct line *line = chan->line;  in line_interrupt()  local
23 	if (line)  in line_interrupt()
24 		chan_interrupt(line, irq);  in line_interrupt()
34 static int write_room(struct line *line)  in write_room()  argument
38 	if (line->buffer == NULL)  in write_room()
42 	n = line->head - line->tail;  in write_room()
51 	struct line *line = tty->driver_data;  in line_write_room()  local
55 	spin_lock_irqsave(&line->lock, flags);  in line_write_room()
56 	room = write_room(line);  in line_write_room()
57 	spin_unlock_irqrestore(&line->lock, flags);  in line_write_room()
64 	struct line *line = tty->driver_data;  in line_chars_in_buffer()  local
68 	spin_lock_irqsave(&line->lock, flags);  in line_chars_in_buffer()
70 	ret = LINE_BUFSIZE - (write_room(line) + 1);  in line_chars_in_buffer()
71 	spin_unlock_irqrestore(&line->lock, flags);  in line_chars_in_buffer()
85 static int buffer_data(struct line *line, const char *buf, int len)  in buffer_data()  argument
89 	if (line->buffer == NULL) {  in buffer_data()
90 		line->buffer = kmalloc(LINE_BUFSIZE, GFP_ATOMIC);  in buffer_data()
91 		if (line->buffer == NULL) {  in buffer_data()
96 		line->head = line->buffer;  in buffer_data()
97 		line->tail = line->buffer;  in buffer_data()
100 	room = write_room(line);  in buffer_data()
103 	end = line->buffer + LINE_BUFSIZE - line->tail;  in buffer_data()
106 		memcpy(line->tail, buf, len);  in buffer_data()
107 		line->tail += len;  in buffer_data()
111 		memcpy(line->tail, buf, end);  in buffer_data()
113 		memcpy(line->buffer, buf, len - end);  in buffer_data()
114 		line->tail = line->buffer + len - end;  in buffer_data()
129 static int flush_buffer(struct line *line)  in flush_buffer()  argument
133 	if ((line->buffer == NULL) || (line->head == line->tail))  in flush_buffer()
136 	if (line->tail < line->head) {  in flush_buffer()
138 		count = line->buffer + LINE_BUFSIZE - line->head;  in flush_buffer()
140 		n = write_chan(line->chan_out, line->head, count,  in flush_buffer()
141 			       line->driver->write_irq);  in flush_buffer()
149 			line->head = line->buffer;  in flush_buffer()
151 			line->head += n;  in flush_buffer()
156 	count = line->tail - line->head;  in flush_buffer()
157 	n = write_chan(line->chan_out, line->head, count,  in flush_buffer()
158 		       line->driver->write_irq);  in flush_buffer()
163 	line->head += n;  in flush_buffer()
164 	return line->head == line->tail;  in flush_buffer()
169 	struct line *line = tty->driver_data;  in line_flush_buffer()  local
172 	spin_lock_irqsave(&line->lock, flags);  in line_flush_buffer()
173 	flush_buffer(line);  in line_flush_buffer()
174 	spin_unlock_irqrestore(&line->lock, flags);  in line_flush_buffer()
193 	struct line *line = tty->driver_data;  in line_write()  local
197 	spin_lock_irqsave(&line->lock, flags);  in line_write()
198 	if (line->head != line->tail)  in line_write()
199 		ret = buffer_data(line, buf, len);  in line_write()
201 		n = write_chan(line->chan_out, buf, len,  in line_write()
202 			       line->driver->write_irq);  in line_write()
211 			ret += buffer_data(line, buf + n, len);  in line_write()
214 	spin_unlock_irqrestore(&line->lock, flags);  in line_write()
225 	struct line *line = tty->driver_data;  in line_throttle()  local
227 	deactivate_chan(line->chan_in, line->driver->read_irq);  in line_throttle()
228 	line->throttled = 1;  in line_throttle()
233 	struct line *line = tty->driver_data;  in line_unthrottle()  local
235 	line->throttled = 0;  in line_unthrottle()
236 	chan_interrupt(line, line->driver->read_irq);  in line_unthrottle()
243 	if (!line->throttled)  in line_unthrottle()
244 		reactivate_chan(line->chan_in, line->driver->read_irq);  in line_unthrottle()
250 	struct line *line = chan->line;  in line_write_interrupt()  local
258 	spin_lock(&line->lock);  in line_write_interrupt()
259 	err = flush_buffer(line);  in line_write_interrupt()
261 		spin_unlock(&line->lock);  in line_write_interrupt()
264 		line->head = line->buffer;  in line_write_interrupt()
265 		line->tail = line->buffer;  in line_write_interrupt()
267 	spin_unlock(&line->lock);  in line_write_interrupt()
269 	tty_port_tty_wakeup(&line->port);  in line_write_interrupt()
274 int line_setup_irq(int fd, int input, int output, struct line *line, void *data)  in line_setup_irq()  argument
276 	const struct line_driver *driver = line->driver;  in line_setup_irq()
295 	struct line *line = tty->driver_data;  in line_activate()  local
297 	ret = enable_chan(line);  in line_activate()
301 	if (!line->sigio) {  in line_activate()
302 		chan_enable_winch(line->chan_out, port);  in line_activate()
303 		line->sigio = 1;  in line_activate()
306 	chan_window_size(line, &tty->winsize.ws_row,  in line_activate()
317 	struct line *line = tty->driver_data;  in line_destruct()  local
319 	if (line->sigio) {  in line_destruct()
321 		line->sigio = 0;  in line_destruct()
332 	struct line *line = tty->driver_data;  in line_open()  local
334 	return tty_port_open(&line->port, tty, filp);  in line_open()
338 		 struct line *line)  in line_install()  argument
346 	tty->driver_data = line;  in line_install()
353 	struct line *line = tty->driver_data;  in line_close()  local
355 	tty_port_close(&line->port, tty, filp);  in line_close()
360 	struct line *line = tty->driver_data;  in line_hangup()  local
362 	tty_port_hangup(&line->port);  in line_hangup()
365 void close_lines(struct line *lines, int nlines)  in close_lines()
373 int setup_one_line(struct line *lines, int n, char *init,  in setup_one_line()
376 	struct line *line = &lines[n];  in setup_one_line()  local
377 	struct tty_driver *driver = line->driver->driver;  in setup_one_line()
380 	if (line->port.count) {  in setup_one_line()
386 		if (line->valid) {  in setup_one_line()
387 			line->valid = 0;  in setup_one_line()
388 			kfree(line->init_str);  in setup_one_line()
390 			parse_chan_pair(NULL, line, n, opts, error_out);  in setup_one_line()
399 		if (line->valid) {  in setup_one_line()
401 			kfree(line->init_str);  in setup_one_line()
403 		line->init_str = new;  in setup_one_line()
404 		line->valid = 1;  in setup_one_line()
405 		err = parse_chan_pair(new, line, n, opts, error_out);  in setup_one_line()
407 			struct device *d = tty_port_register_device(&line->port,  in setup_one_line()
412 				parse_chan_pair(NULL, line, n, opts, error_out);  in setup_one_line()
416 			line->init_str = NULL;  in setup_one_line()
417 			line->valid = 0;  in setup_one_line()
465 int line_config(struct line *lines, unsigned int num, char *str,  in line_config()
489 int line_get_config(char *name, struct line *lines, unsigned int num, char *str,  in line_get_config()
492 	struct line *line;  in line_get_config()  local
507 	line = &lines[dev];  in line_get_config()
509 	if (!line->valid)  in line_get_config()
512 		struct tty_struct *tty = tty_port_tty_get(&line->port);  in line_get_config()
514 			CONFIG_CHUNK(str, size, n, line->init_str, 1);  in line_get_config()
516 			n = chan_config_string(line, str, size, error_out);  in line_get_config()
539 int line_remove(struct line *lines, unsigned int num, int n, char **error_out)  in line_remove()
550 		   struct line *lines, int nlines)  in register_lines()
631 	struct line *line;  in winch_interrupt()  local
657 		line = tty->driver_data;  in winch_interrupt()
658 		if (line != NULL) {  in winch_interrupt()
659 			chan_window_size(line, &tty->winsize.ws_row,  in winch_interrupt()