1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
22 static int not_configged_open(int input, int output, int primary, void *data,  in not_configged_open()  argument
27 	return -ENODEV;  in not_configged_open()
40 	return -EIO;  in not_configged_read()
47 	return -EIO;  in not_configged_write()
54 	return -EIO;  in not_configged_console_write()
62 	return -ENODEV;  in not_configged_window_size()
88 	if (chan->opened)  in open_one_chan()
91 	if (chan->ops->open == NULL)  in open_one_chan()
93 	else fd = (*chan->ops->open)(chan->input, chan->output, chan->primary,  in open_one_chan()
94 				     chan->data, &chan->dev);  in open_one_chan()
100 		(*chan->ops->close)(fd, chan->data);  in open_one_chan()
104 	chan->fd = fd;  in open_one_chan()
106 	chan->opened = 1;  in open_one_chan()
119 		if (chan->primary)  in open_chan()
127 	if (chan && chan->primary && chan->ops->winch)  in chan_enable_winch()
128 		register_winch(chan->fd, port);  in chan_enable_winch()
135 	if (!line->throttled)  in line_timer_cb()
136 		chan_interrupt(line, line->read_irq);  in line_timer_cb()
145 	INIT_DELAYED_WORK(&line->task, line_timer_cb);  in enable_chan()
147 	list_for_each(ele, &line->chan_list) {  in enable_chan()
151 			if (chan->primary)  in enable_chan()
157 		if (chan->enabled)  in enable_chan()
159 		err = line_setup_irq(chan->fd, chan->input, chan->output, line,  in enable_chan()
164 		chan->enabled = 1;  in enable_chan()
174 /* Items are added in IRQ context, when free_irq can't be called, and
175  * removed in process context, when it can.
197 		if (chan->input && chan->enabled)  in free_irqs()
198 			um_free_irq(chan->line->read_irq, chan);  in free_irqs()
199 		if (chan->output && chan->enabled)  in free_irqs()
200 			um_free_irq(chan->line->write_irq, chan);  in free_irqs()
201 		chan->enabled = 0;  in free_irqs()
209 	if (!chan->opened)  in close_one_chan()
214 		list_add(&chan->free_list, &irqs_to_free);  in close_one_chan()
217 		if (chan->input && chan->enabled)  in close_one_chan()
218 			um_free_irq(chan->line->read_irq, chan);  in close_one_chan()
219 		if (chan->output && chan->enabled)  in close_one_chan()
220 			um_free_irq(chan->line->write_irq, chan);  in close_one_chan()
221 		chan->enabled = 0;  in close_one_chan()
223 	if (chan->ops->close != NULL)  in close_one_chan()
224 		(*chan->ops->close)(chan->fd, chan->data);  in close_one_chan()
226 	chan->opened = 0;  in close_one_chan()
227 	chan->fd = -1;  in close_one_chan()
239 	list_for_each_entry_reverse(chan, &line->chan_list, list) {  in close_chan()
246 	if (chan && chan->enabled)  in deactivate_chan()
247 		deactivate_fd(chan->fd, irq);  in deactivate_chan()
254 	if (len == 0 || !chan || !chan->ops->write)  in write_chan()
257 	n = chan->ops->write(chan->fd, buf, len, chan->data);  in write_chan()
258 	if (chan->primary) {  in write_chan()
268 	if (!chan || !chan->ops->console_write)  in console_write_chan()
271 	n = chan->ops->console_write(chan->fd, buf, len);  in console_write_chan()
272 	if (chan->primary)  in console_write_chan()
281 	err = open_chan(&line->chan_list);  in console_open_chan()
285 	printk(KERN_INFO "Console initialized on /dev/%s%d\n", co->name,  in console_open_chan()
286 	       co->index);  in console_open_chan()
295 	chan = line->chan_in;  in chan_window_size()
296 	if (chan && chan->primary) {  in chan_window_size()
297 		if (chan->ops->window_size == NULL)  in chan_window_size()
299 		return chan->ops->window_size(chan->fd, chan->data,  in chan_window_size()
302 	chan = line->chan_out;  in chan_window_size()
303 	if (chan && chan->primary) {  in chan_window_size()
304 		if (chan->ops->window_size == NULL)  in chan_window_size()
306 		return chan->ops->window_size(chan->fd, chan->data,  in chan_window_size()
314 	list_del(&chan->list);  in free_one_chan()
318 	if (chan->ops->free != NULL)  in free_one_chan()
319 		(*chan->ops->free)(chan->data);  in free_one_chan()
321 	if (chan->primary && chan->output)  in free_one_chan()
322 		ignore_sigio_fd(chan->fd);  in free_one_chan()
347 	CONFIG_CHUNK(str, size, n, chan->ops->type, 0);  in one_chan_config_string()
349 	if (chan->dev == NULL) {  in one_chan_config_string()
355 	CONFIG_CHUNK(str, size, n, chan->dev, 0);  in one_chan_config_string()
367 	size -= n;  in chan_pair_config_string()
377 	size -= n;  in chan_pair_config_string()
386 	struct chan *in = line->chan_in, *out = line->chan_out;  in chan_config_string()
388 	if (in && !in->primary)  in chan_config_string()
390 	if (out && !out->primary)  in chan_config_string()
450 		if (!strncmp(str, entry->key, strlen(entry->key))) {  in parse_chan()
451 			ops = entry->ops;  in parse_chan()
452 			str += strlen(entry->key);  in parse_chan()
461 	data = (*ops->init)(str, device, opts);  in parse_chan()
472 	*chan = ((struct chan) { .list	 	= LIST_HEAD_INIT(chan->list),  in parse_chan()
474 				 	LIST_HEAD_INIT(chan->free_list),  in parse_chan()
476 				 .primary	= 1,  in parse_chan()
481 				 .fd 		= -1,  in parse_chan()
490 	struct list_head *chans = &line->chan_list;  in parse_chan_pair()
495 		line->chan_in = line->chan_out = NULL;  in parse_chan_pair()
510 			return -1;  in parse_chan_pair()
512 		new->input = 1;  in parse_chan_pair()
513 		list_add(&new->list, chans);  in parse_chan_pair()
514 		line->chan_in = new;  in parse_chan_pair()
518 			return -1;  in parse_chan_pair()
520 		list_add(&new->list, chans);  in parse_chan_pair()
521 		new->output = 1;  in parse_chan_pair()
522 		line->chan_out = new;  in parse_chan_pair()
527 			return -1;  in parse_chan_pair()
529 		list_add(&new->list, chans);  in parse_chan_pair()
530 		new->input = 1;  in parse_chan_pair()
531 		new->output = 1;  in parse_chan_pair()
532 		line->chan_in = line->chan_out = new;  in parse_chan_pair()
539 	struct tty_port *port = &line->port;  in chan_interrupt()
540 	struct chan *chan = line->chan_in;  in chan_interrupt()
544 	if (!chan || !chan->ops->read)  in chan_interrupt()
549 			schedule_delayed_work(&line->task, 1);  in chan_interrupt()
552 		err = chan->ops->read(chan->fd, &c, chan->data);  in chan_interrupt()
557 	if (err == -EIO) {  in chan_interrupt()
558 		if (chan->primary) {  in chan_interrupt()
559 			tty_port_tty_hangup(&line->port, false);  in chan_interrupt()
560 			if (line->chan_out != chan)  in chan_interrupt()
561 				close_one_chan(line->chan_out, 1);  in chan_interrupt()
564 		if (chan->primary)  in chan_interrupt()