1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
19 static irqreturn_t line_interrupt(int irq, void *data)  in line_interrupt()  argument
21 	struct chan *chan = data;  in line_interrupt()
22 	struct line *line = chan->line;  in line_interrupt()
33  * Should be called while holding line->lock (this does not modify data).
39 	if (line->buffer == NULL)  in write_room()
40 		return LINE_BUFSIZE - 1;  in write_room()
43 	n = line->head - line->tail;  in write_room()
47 	return n - 1;  in write_room()
52 	struct line *line = tty->driver_data;  in line_write_room()
56 	spin_lock_irqsave(&line->lock, flags);  in line_write_room()
58 	spin_unlock_irqrestore(&line->lock, flags);  in line_write_room()
65 	struct line *line = tty->driver_data;  in line_chars_in_buffer()
69 	spin_lock_irqsave(&line->lock, flags);  in line_chars_in_buffer()
71 	ret = LINE_BUFSIZE - (write_room(line) + 1);  in line_chars_in_buffer()
72 	spin_unlock_irqrestore(&line->lock, flags);  in line_chars_in_buffer()
84  * Must be called while holding line->lock!
90 	if (line->buffer == NULL) {  in buffer_data()
91 		line->buffer = kmalloc(LINE_BUFSIZE, GFP_ATOMIC);  in buffer_data()
92 		if (line->buffer == NULL) {  in buffer_data()
93 			printk(KERN_ERR "buffer_data - atomic allocation "  in buffer_data()
97 		line->head = line->buffer;  in buffer_data()
98 		line->tail = line->buffer;  in buffer_data()
104 	end = line->buffer + LINE_BUFSIZE - line->tail;  in buffer_data()
107 		memcpy(line->tail, buf, len);  in buffer_data()
108 		line->tail += len;  in buffer_data()
112 		memcpy(line->tail, buf, end);  in buffer_data()
114 		memcpy(line->buffer, buf, len - end);  in buffer_data()
115 		line->tail = line->buffer + len - end;  in buffer_data()
123  * called, passing it line->head as buffer, and an appropriate count.
127  * and -errno when an error occurred.
129  * Must be called while holding line->lock!*/
134 	if ((line->buffer == NULL) || (line->head == line->tail))  in flush_buffer()
137 	if (line->tail < line->head) {  in flush_buffer()
138 		/* line->buffer + LINE_BUFSIZE is the end of the buffer! */  in flush_buffer()
139 		count = line->buffer + LINE_BUFSIZE - line->head;  in flush_buffer()
141 		n = write_chan(line->chan_out, line->head, count,  in flush_buffer()
142 			       line->write_irq);  in flush_buffer()
147 			 * We have flushed from ->head to buffer end, now we  in flush_buffer()
148 			 * must flush only from the beginning to ->tail.  in flush_buffer()
150 			line->head = line->buffer;  in flush_buffer()
152 			line->head += n;  in flush_buffer()
157 	count = line->tail - line->head;  in flush_buffer()
158 	n = write_chan(line->chan_out, line->head, count,  in flush_buffer()
159 		       line->write_irq);  in flush_buffer()
164 	line->head += n;  in flush_buffer()
165 	return line->head == line->tail;  in flush_buffer()
170 	struct line *line = tty->driver_data;  in line_flush_buffer()
173 	spin_lock_irqsave(&line->lock, flags);  in line_flush_buffer()
175 	spin_unlock_irqrestore(&line->lock, flags);  in line_flush_buffer()
179  * We map both ->flush_chars and ->put_char (which go in pair) onto
180  * ->flush_buffer and ->write. Hope it's not that bad.
189 	struct line *line = tty->driver_data;  in line_write()
193 	spin_lock_irqsave(&line->lock, flags);  in line_write()
194 	if (line->head != line->tail)  in line_write()
197 		n = write_chan(line->chan_out, buf, len,  in line_write()
198 			       line->write_irq);  in line_write()
204 		len -= n;  in line_write()
210 	spin_unlock_irqrestore(&line->lock, flags);  in line_write()
216 	struct line *line = tty->driver_data;  in line_throttle()
218 	deactivate_chan(line->chan_in, line->read_irq);  in line_throttle()
219 	line->throttled = 1;  in line_throttle()
224 	struct line *line = tty->driver_data;  in line_unthrottle()
226 	line->throttled = 0;  in line_unthrottle()
227 	chan_interrupt(line, line->read_irq);  in line_unthrottle()
230 static irqreturn_t line_write_interrupt(int irq, void *data)  in line_write_interrupt()  argument
232 	struct chan *chan = data;  in line_write_interrupt()
233 	struct line *line = chan->line;  in line_write_interrupt()
241 	spin_lock(&line->lock);  in line_write_interrupt()
244 		spin_unlock(&line->lock);  in line_write_interrupt()
246 	} else if ((err < 0) && (err != -EAGAIN)) {  in line_write_interrupt()
247 		line->head = line->buffer;  in line_write_interrupt()
248 		line->tail = line->buffer;  in line_write_interrupt()
250 	spin_unlock(&line->lock);  in line_write_interrupt()
252 	tty_port_tty_wakeup(&line->port);  in line_write_interrupt()
257 int line_setup_irq(int fd, int input, int output, struct line *line, void *data)  in line_setup_irq()  argument
259 	const struct line_driver *driver = line->driver;  in line_setup_irq()
265 				     driver->read_irq_name, data);  in line_setup_irq()
269 		line->read_irq = err;  in line_setup_irq()
275 				     driver->write_irq_name, data);  in line_setup_irq()
279 		line->write_irq = err;  in line_setup_irq()
288 	struct line *line = tty->driver_data;  in line_activate()
294 	if (!line->sigio) {  in line_activate()
295 		chan_enable_winch(line->chan_out, port);  in line_activate()
296 		line->sigio = 1;  in line_activate()
299 	chan_window_size(line, &tty->winsize.ws_row,  in line_activate()
300 		&tty->winsize.ws_col);  in line_activate()
310 	struct line *line = tty->driver_data;  in line_destruct()
312 	if (line->sigio) {  in line_destruct()
314 		line->sigio = 0;  in line_destruct()
325 	struct line *line = tty->driver_data;  in line_open()
327 	return tty_port_open(&line->port, tty, filp);  in line_open()
339 	tty->driver_data = line;  in line_install()
346 	struct line *line = tty->driver_data;  in line_close()
348 	tty_port_close(&line->port, tty, filp);  in line_close()
353 	struct line *line = tty->driver_data;  in line_hangup()
355 	tty_port_hangup(&line->port);  in line_hangup()
358 void close_lines(struct line *lines, int nlines)  in close_lines()  argument
363 		close_chan(&lines[i]);  in close_lines()
366 int setup_one_line(struct line *lines, int n, char *init,  in setup_one_line()  argument
369 	struct line *line = &lines[n];  in setup_one_line()
370 	struct tty_driver *driver = line->driver->driver;  in setup_one_line()
371 	int err = -EINVAL;  in setup_one_line()
373 	if (line->port.count) {  in setup_one_line()
379 		if (line->valid) {  in setup_one_line()
380 			line->valid = 0;  in setup_one_line()
381 			kfree(line->init_str);  in setup_one_line()
391 			return -ENOMEM;  in setup_one_line()
393 		if (line->valid) {  in setup_one_line()
395 			kfree(line->init_str);  in setup_one_line()
397 		line->init_str = new;  in setup_one_line()
398 		line->valid = 1;  in setup_one_line()
401 			struct device *d = tty_port_register_device(&line->port,  in setup_one_line()
411 			line->init_str = NULL;  in setup_one_line()
412 			line->valid = 0;  in setup_one_line()
422  * @lines contains the array (of size @num) to modify;
457 	return -EINVAL;  in line_setup()
460 int line_config(struct line *lines, unsigned int num, char *str,  in line_config()  argument
468 		return -EINVAL;  in line_config()
474 		return -EINVAL;  in line_config()
478 		return -EINVAL;  in line_config()
481 	return setup_one_line(lines, n, end, opts, error_out);  in line_config()
484 int line_get_config(char *name, struct line *lines, unsigned int num, char *str,  in line_get_config()  argument
502 	line = &lines[dev];  in line_get_config()
504 	if (!line->valid)  in line_get_config()
507 		struct tty_struct *tty = tty_port_tty_get(&line->port);  in line_get_config()
509 			CONFIG_CHUNK(str, size, n, line->init_str, 1);  in line_get_config()
526 		return -1;  in line_id()
534 int line_remove(struct line *lines, unsigned int num, int n, char **error_out)  in line_remove()  argument
538 		return -EINVAL;  in line_remove()
540 	return setup_one_line(lines, n, "none", NULL, error_out);  in line_remove()
545 		   struct line *lines, int nlines)  in register_lines()  argument
556 	driver->driver_name = line_driver->name;  in register_lines()
557 	driver->name = line_driver->device_name;  in register_lines()
558 	driver->major = line_driver->major;  in register_lines()
559 	driver->minor_start = line_driver->minor_start;  in register_lines()
560 	driver->type = line_driver->type;  in register_lines()
561 	driver->subtype = line_driver->subtype;  in register_lines()
562 	driver->init_termios = tty_std_termios;  in register_lines()
565 		tty_port_init(&lines[i].port);  in register_lines()
566 		lines[i].port.ops = &line_port_ops;  in register_lines()
567 		spin_lock_init(&lines[i].lock);  in register_lines()
568 		lines[i].driver = line_driver;  in register_lines()
569 		INIT_LIST_HEAD(&lines[i].chan_list);  in register_lines()
576 		       line_driver->name);  in register_lines()
579 			tty_port_destroy(&lines[i].port);  in register_lines()
583 	line_driver->driver = driver;  in register_lines()
584 	mconsole_register_dev(&line_driver->mc);  in register_lines()
606 	if (winch->pid != -1)  in __free_winch()
607 		os_kill_process(winch->pid, 1);  in __free_winch()
608 	if (winch->stack != 0)  in __free_winch()
609 		free_stack(winch->stack, 0);  in __free_winch()
615 	int fd = winch->fd;  in free_winch()
616 	winch->fd = -1;  in free_winch()
617 	if (fd != -1)  in free_winch()
619 	__free_winch(&winch->work);  in free_winch()
622 static irqreturn_t winch_interrupt(int irq, void *data)  in winch_interrupt()  argument
624 	struct winch *winch = data;  in winch_interrupt()
627 	int fd = winch->fd;  in winch_interrupt()
632 	if (fd != -1) {  in winch_interrupt()
636 			if (err != -EAGAIN) {  in winch_interrupt()
637 				winch->fd = -1;  in winch_interrupt()
638 				list_del(&winch->list);  in winch_interrupt()
642 					       -err);  in winch_interrupt()
644 					       winch->tty_fd);  in winch_interrupt()
646 				INIT_WORK(&winch->work, __free_winch);  in winch_interrupt()
647 				schedule_work(&winch->work);  in winch_interrupt()
653 	tty = tty_port_tty_get(winch->port);  in winch_interrupt()
655 		line = tty->driver_data;  in winch_interrupt()
657 			chan_window_size(line, &tty->winsize.ws_row,  in winch_interrupt()
658 					 &tty->winsize.ws_col);  in winch_interrupt()
677 		printk(KERN_ERR "register_winch_irq - kmalloc failed\n");  in register_winch_irq()
688 	list_add(&winch->list, &winch_handlers);  in register_winch_irq()
693 		printk(KERN_ERR "register_winch_irq - failed to register "  in register_winch_irq()
696 		list_del(&winch->list);  in register_winch_irq()
722 		wtty = tty_port_tty_get(winch->port);  in unregister_winch()
724 			list_del(&winch->list);  in unregister_winch()
741 		list_del(&winch->list);  in winch_cleanup()