1 // SPDX-License-Identifier: GPL-2.0+
3  * u_serial.c - utilities for USB gadget "serial port"/TTY support
10  * Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com)
26 #include <linux/console.h>
65  * gserial <---> gs_port ... links will be null when the USB link is
68  *	gserial->ioport == usb_ep->driver_data ... gs_port
69  *	gs_port->port_usb ... gserial
71  * gs_port <---> tty_struct ... links will be null when the TTY file
73  *	gserial->port_tty ... tty_struct
74  *	tty_struct->driver_data ... gserial
85 /* Prevents race conditions while accessing gser->ioport */
88 /* console info */
90 	struct console		console;  member
108 	struct gs_console	*console;  member
131 	struct usb_cdc_line_coding port_line_coding;	/* 8-N-1 etc */
155 /*-------------------------------------------------------------------------*/
173 		req->length = len;  in gs_alloc_req()
174 		req->buf = kmalloc(len, kmalloc_flags);  in gs_alloc_req()
175 		if (req->buf == NULL) {  in gs_alloc_req()
192 	kfree(req->buf);  in gs_free_req()
201  * buffer and the size is returned.  If there is no data to
207 gs_send_packet(struct gs_port *port, char *packet, unsigned size)  in gs_send_packet()  argument
211 	len = kfifo_len(&port->port_write_buf);  in gs_send_packet()
212 	if (len < size)  in gs_send_packet()
213 		size = len;  in gs_send_packet()
214 	if (size != 0)  in gs_send_packet()
215 		size = kfifo_out(&port->port_write_buf, packet, size);  in gs_send_packet()
216 	return size;  in gs_send_packet()
228  * Context: caller owns port_lock; port_usb is non-null.
232 __releases(&port->port_lock)  in gs_start_tx()
233 __acquires(&port->port_lock)  in gs_start_tx()
236 	struct list_head	*pool = &port->write_pool;  in gs_start_tx()
241 	if (!port->port_usb)  in gs_start_tx()
244 	in = port->port_usb->in;  in gs_start_tx()
246 	while (!port->write_busy && !list_empty(pool)) {  in gs_start_tx()
250 		if (port->write_started >= QUEUE_SIZE)  in gs_start_tx()
253 		req = list_entry(pool->next, struct usb_request, list);  in gs_start_tx()
254 		len = gs_send_packet(port, req->buf, in->maxpacket);  in gs_start_tx()
256 			wake_up_interruptible(&port->drain_wait);  in gs_start_tx()
261 		req->length = len;  in gs_start_tx()
262 		list_del(&req->list);  in gs_start_tx()
263 		req->zero = kfifo_is_empty(&port->port_write_buf);  in gs_start_tx()
265 		pr_vdebug("ttyGS%d: tx len=%d, %3ph ...\n", port->port_num, len, req->buf);  in gs_start_tx()
272 		 * the TTY closed (dev->ioport->port_tty is NULL).  in gs_start_tx()
274 		port->write_busy = true;  in gs_start_tx()
275 		spin_unlock(&port->port_lock);  in gs_start_tx()
277 		spin_lock(&port->port_lock);  in gs_start_tx()
278 		port->write_busy = false;  in gs_start_tx()
282 					__func__, "queue", in->name, status);  in gs_start_tx()
283 			list_add(&req->list, pool);  in gs_start_tx()
287 		port->write_started++;  in gs_start_tx()
290 		if (!port->port_usb)  in gs_start_tx()
294 	if (do_tty_wake && port->port.tty)  in gs_start_tx()
295 		tty_wakeup(port->port.tty);  in gs_start_tx()
304 __releases(&port->port_lock)  in gs_start_rx()
305 __acquires(&port->port_lock)  in gs_start_rx()
308 	struct list_head	*pool = &port->read_pool;  in gs_start_rx()
309 	struct usb_ep		*out = port->port_usb->out;  in gs_start_rx()
317 		tty = port->port.tty;  in gs_start_rx()
321 		if (port->read_started >= QUEUE_SIZE)  in gs_start_rx()
324 		req = list_entry(pool->next, struct usb_request, list);  in gs_start_rx()
325 		list_del(&req->list);  in gs_start_rx()
326 		req->length = out->maxpacket;  in gs_start_rx()
331 		spin_unlock(&port->port_lock);  in gs_start_rx()
333 		spin_lock(&port->port_lock);  in gs_start_rx()
337 					__func__, "queue", out->name, status);  in gs_start_rx()
338 			list_add(&req->list, pool);  in gs_start_rx()
341 		port->read_started++;  in gs_start_rx()
344 		if (!port->port_usb)  in gs_start_rx()
347 	return port->read_started;  in gs_start_rx()
365 	struct list_head	*queue = &port->read_queue;  in gs_rx_push()
370 	spin_lock_irq(&port->port_lock);  in gs_rx_push()
371 	tty = port->port.tty;  in gs_rx_push()
381 		switch (req->status) {  in gs_rx_push()
382 		case -ESHUTDOWN:  in gs_rx_push()
384 			pr_vdebug("ttyGS%d: shutdown\n", port->port_num);  in gs_rx_push()
390 				port->port_num, req->status);  in gs_rx_push()
398 		if (req->actual && tty) {  in gs_rx_push()
399 			char		*packet = req->buf;  in gs_rx_push()
400 			unsigned	size = req->actual;  in gs_rx_push()  local
405 			n = port->n_read;  in gs_rx_push()
408 				size -= n;  in gs_rx_push()
411 			count = tty_insert_flip_string(&port->port, packet,  in gs_rx_push()
412 					size);  in gs_rx_push()
415 			if (count != size) {  in gs_rx_push()
417 				port->n_read += count;  in gs_rx_push()
419 					  port->port_num, count, req->actual);  in gs_rx_push()
422 			port->n_read = 0;  in gs_rx_push()
425 		list_move(&req->list, &port->read_pool);  in gs_rx_push()
426 		port->read_started--;  in gs_rx_push()
433 		tty_flip_buffer_push(&port->port);  in gs_rx_push()
440 	 * We may leave non-empty queue only when there is a tty, and  in gs_rx_push()
444 		schedule_delayed_work(&port->push, 1);  in gs_rx_push()
447 	if (!disconnect && port->port_usb)  in gs_rx_push()
450 	spin_unlock_irq(&port->port_lock);  in gs_rx_push()
455 	struct gs_port	*port = ep->driver_data;  in gs_read_complete()
458 	spin_lock(&port->port_lock);  in gs_read_complete()
459 	list_add_tail(&req->list, &port->read_queue);  in gs_read_complete()
460 	schedule_delayed_work(&port->push, 0);  in gs_read_complete()
461 	spin_unlock(&port->port_lock);  in gs_read_complete()
466 	struct gs_port	*port = ep->driver_data;  in gs_write_complete()
468 	spin_lock(&port->port_lock);  in gs_write_complete()
469 	list_add(&req->list, &port->write_pool);  in gs_write_complete()
470 	port->write_started--;  in gs_write_complete()
472 	switch (req->status) {  in gs_write_complete()
476 			__func__, ep->name, req->status);  in gs_write_complete()
483 	case -ESHUTDOWN:  in gs_write_complete()
485 		pr_vdebug("%s: %s shutdown\n", __func__, ep->name);  in gs_write_complete()
489 	spin_unlock(&port->port_lock);  in gs_write_complete()
498 		req = list_entry(head->next, struct usb_request, list);  in gs_free_requests()
499 		list_del(&req->list);  in gs_free_requests()
502 			(*allocated)--;  in gs_free_requests()
512 	int n = allocated ? QUEUE_SIZE - *allocated : QUEUE_SIZE;  in gs_alloc_requests()
514 	/* Pre-allocate up to QUEUE_SIZE transfers, but if we can't  in gs_alloc_requests()
519 		req = gs_alloc_req(ep, ep->maxpacket, GFP_ATOMIC);  in gs_alloc_requests()
521 			return list_empty(head) ? -ENOMEM : 0;  in gs_alloc_requests()
522 		req->complete = fn;  in gs_alloc_requests()
523 		list_add_tail(&req->list, head);  in gs_alloc_requests()
531  * gs_start_io - start USB I/O streams
533  * Context: holding port_lock; port_tty and port_usb are non-null
541 	struct list_head	*head = &port->read_pool;  in gs_start_io()
546 	if (!port->port_usb || !port->port.tty)  in gs_start_io()
547 		return -EIO;  in gs_start_io()
555 	ep = port->port_usb->out;  in gs_start_io()
557 		&port->read_allocated);  in gs_start_io()
561 	status = gs_alloc_requests(port->port_usb->in, &port->write_pool,  in gs_start_io()
562 			gs_write_complete, &port->write_allocated);  in gs_start_io()
564 		gs_free_requests(ep, head, &port->read_allocated);  in gs_start_io()
569 	port->n_read = 0;  in gs_start_io()
576 		tty_wakeup(port->port.tty);  in gs_start_io()
578 		gs_free_requests(ep, head, &port->read_allocated);  in gs_start_io()
579 		gs_free_requests(port->port_usb->in, &port->write_pool,  in gs_start_io()
580 			&port->write_allocated);  in gs_start_io()
581 		status = -EIO;  in gs_start_io()
587 /*-------------------------------------------------------------------------*/
598 	int		port_num = tty->index;  in gs_open()
605 		status = -ENODEV;  in gs_open()
609 	spin_lock_irq(&port->port_lock);  in gs_open()
612 	if (!kfifo_initialized(&port->port_write_buf)) {  in gs_open()
614 		spin_unlock_irq(&port->port_lock);  in gs_open()
621 		status = kfifo_alloc(&port->port_write_buf,  in gs_open()
629 		spin_lock_irq(&port->port_lock);  in gs_open()
633 	if (port->port.count++)  in gs_open()
636 	tty->driver_data = port;  in gs_open()
637 	port->port.tty = tty;  in gs_open()
640 	if (port->port_usb) {  in gs_open()
642 		if (!port->suspended) {  in gs_open()
643 			struct gserial	*gser = port->port_usb;  in gs_open()
645 			pr_debug("gs_open: start ttyGS%d\n", port->port_num);  in gs_open()
648 			if (gser->connect)  in gs_open()
649 				gser->connect(gser);  in gs_open()
651 			pr_debug("delay start of ttyGS%d\n", port->port_num);  in gs_open()
652 			port->start_delayed = true;  in gs_open()
656 	pr_debug("gs_open: ttyGS%d (%p,%p)\n", port->port_num, tty, file);  in gs_open()
659 	spin_unlock_irq(&port->port_lock);  in gs_open()
670 	spin_lock_irq(&p->port_lock);  in gs_close_flush_done()
671 	cond = p->port_usb == NULL || !kfifo_len(&p->port_write_buf) ||  in gs_close_flush_done()
672 		p->port.count > 1;  in gs_close_flush_done()
673 	spin_unlock_irq(&p->port_lock);  in gs_close_flush_done()
680 	struct gs_port *port = tty->driver_data;  in gs_close()
683 	spin_lock_irq(&port->port_lock);  in gs_close()
685 	if (port->port.count != 1) {  in gs_close()
687 		if (port->port.count == 0)  in gs_close()
690 			--port->port.count;  in gs_close()
694 	pr_debug("gs_close: ttyGS%d (%p,%p) ...\n", port->port_num, tty, file);  in gs_close()
696 	gser = port->port_usb;  in gs_close()
697 	if (gser && !port->suspended && gser->disconnect)  in gs_close()
698 		gser->disconnect(gser);  in gs_close()
703 	if (kfifo_len(&port->port_write_buf) > 0 && gser) {  in gs_close()
704 		spin_unlock_irq(&port->port_lock);  in gs_close()
705 		wait_event_interruptible_timeout(port->drain_wait,  in gs_close()
708 		spin_lock_irq(&port->port_lock);  in gs_close()
710 		if (port->port.count != 1)  in gs_close()
713 		gser = port->port_usb;  in gs_close()
718 	 * let the push async work fire again until we're re-opened.  in gs_close()
721 		kfifo_free(&port->port_write_buf);  in gs_close()
723 		kfifo_reset(&port->port_write_buf);  in gs_close()
725 	port->start_delayed = false;  in gs_close()
726 	port->port.count = 0;  in gs_close()
727 	port->port.tty = NULL;  in gs_close()
730 			port->port_num, tty, file);  in gs_close()
732 	wake_up(&port->close_wait);  in gs_close()
734 	spin_unlock_irq(&port->port_lock);  in gs_close()
739 	struct gs_port	*port = tty->driver_data;  in gs_write()
743 			port->port_num, tty, count);  in gs_write()
745 	spin_lock_irqsave(&port->port_lock, flags);  in gs_write()
747 		count = kfifo_in(&port->port_write_buf, buf, count);  in gs_write()
749 	if (port->port_usb)  in gs_write()
751 	spin_unlock_irqrestore(&port->port_lock, flags);  in gs_write()
758 	struct gs_port	*port = tty->driver_data;  in gs_put_char()
763 		port->port_num, tty, ch, __builtin_return_address(0));  in gs_put_char()
765 	spin_lock_irqsave(&port->port_lock, flags);  in gs_put_char()
766 	status = kfifo_put(&port->port_write_buf, ch);  in gs_put_char()
767 	spin_unlock_irqrestore(&port->port_lock, flags);  in gs_put_char()
774 	struct gs_port	*port = tty->driver_data;  in gs_flush_chars()
777 	pr_vdebug("gs_flush_chars: (%d,%p)\n", port->port_num, tty);  in gs_flush_chars()
779 	spin_lock_irqsave(&port->port_lock, flags);  in gs_flush_chars()
780 	if (port->port_usb)  in gs_flush_chars()
782 	spin_unlock_irqrestore(&port->port_lock, flags);  in gs_flush_chars()
787 	struct gs_port	*port = tty->driver_data;  in gs_write_room()
791 	spin_lock_irqsave(&port->port_lock, flags);  in gs_write_room()
792 	if (port->port_usb)  in gs_write_room()
793 		room = kfifo_avail(&port->port_write_buf);  in gs_write_room()
794 	spin_unlock_irqrestore(&port->port_lock, flags);  in gs_write_room()
797 		port->port_num, tty, room);  in gs_write_room()
804 	struct gs_port	*port = tty->driver_data;  in gs_chars_in_buffer()
808 	spin_lock_irqsave(&port->port_lock, flags);  in gs_chars_in_buffer()
809 	chars = kfifo_len(&port->port_write_buf);  in gs_chars_in_buffer()
810 	spin_unlock_irqrestore(&port->port_lock, flags);  in gs_chars_in_buffer()
813 		port->port_num, tty, chars);  in gs_chars_in_buffer()
821 	struct gs_port		*port = tty->driver_data;  in gs_unthrottle()
824 	spin_lock_irqsave(&port->port_lock, flags);  in gs_unthrottle()
825 	if (port->port_usb) {  in gs_unthrottle()
830 		pr_vdebug("ttyGS%d: unthrottle\n", port->port_num);  in gs_unthrottle()
831 		schedule_delayed_work(&port->push, 0);  in gs_unthrottle()
833 	spin_unlock_irqrestore(&port->port_lock, flags);  in gs_unthrottle()
838 	struct gs_port	*port = tty->driver_data;  in gs_break_ctl()
843 			port->port_num, duration);  in gs_break_ctl()
845 	spin_lock_irq(&port->port_lock);  in gs_break_ctl()
846 	gser = port->port_usb;  in gs_break_ctl()
847 	if (gser && gser->send_break)  in gs_break_ctl()
848 		status = gser->send_break(gser, duration);  in gs_break_ctl()
849 	spin_unlock_irq(&port->port_lock);  in gs_break_ctl()
866 /*-------------------------------------------------------------------------*/
874 	struct gs_console *cons = req->context;  in gs_console_complete_out()
876 	switch (req->status) {  in gs_console_complete_out()
879 			__func__, ep->name, req->status);  in gs_console_complete_out()
883 		spin_lock(&cons->lock);  in gs_console_complete_out()
884 		req->length = 0;  in gs_console_complete_out()
885 		schedule_work(&cons->work);  in gs_console_complete_out()
886 		spin_unlock(&cons->lock);  in gs_console_complete_out()
888 	case -ECONNRESET:  in gs_console_complete_out()
889 	case -ESHUTDOWN:  in gs_console_complete_out()
891 		pr_vdebug("%s: %s shutdown\n", __func__, ep->name);  in gs_console_complete_out()
898 	struct usb_request *req = cons->req;  in __gs_console_push()
900 	size_t size;  in __gs_console_push()  local
905 	if (req->length)  in __gs_console_push()
908 	ep = cons->console.data;  in __gs_console_push()
909 	size = kfifo_out(&cons->buf, req->buf, ep->maxpacket);  in __gs_console_push()
910 	if (!size)  in __gs_console_push()
913 	if (cons->missed && ep->maxpacket >= 64) {  in __gs_console_push()
917 		len = sprintf(buf, "\n[missed %zu bytes]\n", cons->missed);  in __gs_console_push()
918 		kfifo_in(&cons->buf, buf, len);  in __gs_console_push()
919 		cons->missed = 0;  in __gs_console_push()
922 	req->length = size;  in __gs_console_push()
924 	spin_unlock_irq(&cons->lock);  in __gs_console_push()
926 		req->length = 0;  in __gs_console_push()
927 	spin_lock_irq(&cons->lock);  in __gs_console_push()
934 	spin_lock_irq(&cons->lock);  in gs_console_work()
938 	spin_unlock_irq(&cons->lock);  in gs_console_work()
941 static void gs_console_write(struct console *co,  in gs_console_write()
944 	struct gs_console *cons = container_of(co, struct gs_console, console);  in gs_console_write()
948 	spin_lock_irqsave(&cons->lock, flags);  in gs_console_write()
950 	n = kfifo_in(&cons->buf, buf, count);  in gs_console_write()
952 		cons->missed += count - n;  in gs_console_write()
954 	if (cons->req && !cons->req->length)  in gs_console_write()
955 		schedule_work(&cons->work);  in gs_console_write()
957 	spin_unlock_irqrestore(&cons->lock, flags);  in gs_console_write()
960 static struct tty_driver *gs_console_device(struct console *co, int *index)  in gs_console_device()
962 	*index = co->index;  in gs_console_device()
968 	struct gs_console *cons = port->console;  in gs_console_connect()
975 	ep = port->port_usb->in;  in gs_console_connect()
976 	req = gs_alloc_req(ep, ep->maxpacket, GFP_ATOMIC);  in gs_console_connect()
978 		return -ENOMEM;  in gs_console_connect()
979 	req->complete = gs_console_complete_out;  in gs_console_connect()
980 	req->context = cons;  in gs_console_connect()
981 	req->length = 0;  in gs_console_connect()
983 	spin_lock(&cons->lock);  in gs_console_connect()
984 	cons->req = req;  in gs_console_connect()
985 	cons->console.data = ep;  in gs_console_connect()
986 	spin_unlock(&cons->lock);  in gs_console_connect()
988 	pr_debug("ttyGS%d: console connected!\n", port->port_num);  in gs_console_connect()
990 	schedule_work(&cons->work);  in gs_console_connect()
997 	struct gs_console *cons = port->console;  in gs_console_disconnect()
1004 	spin_lock(&cons->lock);  in gs_console_disconnect()
1006 	req = cons->req;  in gs_console_disconnect()
1007 	ep = cons->console.data;  in gs_console_disconnect()
1008 	cons->req = NULL;  in gs_console_disconnect()
1010 	spin_unlock(&cons->lock);  in gs_console_disconnect()
1024 	if (port->console)  in gs_console_init()
1027 	cons = kzalloc(sizeof(*port->console), GFP_KERNEL);  in gs_console_init()
1029 		return -ENOMEM;  in gs_console_init()
1031 	strcpy(cons->console.name, "ttyGS");  in gs_console_init()
1032 	cons->console.write = gs_console_write;  in gs_console_init()
1033 	cons->console.device = gs_console_device;  in gs_console_init()
1034 	cons->console.flags = CON_PRINTBUFFER;  in gs_console_init()
1035 	cons->console.index = port->port_num;  in gs_console_init()
1037 	INIT_WORK(&cons->work, gs_console_work);  in gs_console_init()
1038 	spin_lock_init(&cons->lock);  in gs_console_init()
1040 	err = kfifo_alloc(&cons->buf, GS_CONSOLE_BUF_SIZE, GFP_KERNEL);  in gs_console_init()
1042 		pr_err("ttyGS%d: allocate console buffer failed\n", port->port_num);  in gs_console_init()
1047 	port->console = cons;  in gs_console_init()
1048 	register_console(&cons->console);  in gs_console_init()
1050 	spin_lock_irq(&port->port_lock);  in gs_console_init()
1051 	if (port->port_usb)  in gs_console_init()
1053 	spin_unlock_irq(&port->port_lock);  in gs_console_init()
1060 	struct gs_console *cons = port->console;  in gs_console_exit()
1065 	unregister_console(&cons->console);  in gs_console_exit()
1067 	spin_lock_irq(&port->port_lock);  in gs_console_exit()
1068 	if (cons->req)  in gs_console_exit()
1070 	spin_unlock_irq(&port->port_lock);  in gs_console_exit()
1072 	cancel_work_sync(&cons->work);  in gs_console_exit()
1073 	kfifo_free(&cons->buf);  in gs_console_exit()
1075 	port->console = NULL;  in gs_console_exit()
1092 		ret = -ENXIO;  in gserial_set_console()
1116 		ret = -ENXIO;  in gserial_get_console()
1118 		ret = sprintf(page, "%u\n", !!port->console);  in gserial_get_console()
1139 	return -ENOSYS;  in gs_console_init()
1156 		ret = -EBUSY;  in gs_port_alloc()
1162 		ret = -ENOMEM;  in gs_port_alloc()
1166 	tty_port_init(&port->port);  in gs_port_alloc()
1167 	spin_lock_init(&port->port_lock);  in gs_port_alloc()
1168 	init_waitqueue_head(&port->drain_wait);  in gs_port_alloc()
1169 	init_waitqueue_head(&port->close_wait);  in gs_port_alloc()
1171 	INIT_DELAYED_WORK(&port->push, gs_rx_push);  in gs_port_alloc()
1173 	INIT_LIST_HEAD(&port->read_pool);  in gs_port_alloc()
1174 	INIT_LIST_HEAD(&port->read_queue);  in gs_port_alloc()
1175 	INIT_LIST_HEAD(&port->write_pool);  in gs_port_alloc()
1177 	port->port_num = port_num;  in gs_port_alloc()
1178 	port->port_line_coding = *coding;  in gs_port_alloc()
1190 	spin_lock_irq(&port->port_lock);  in gs_closed()
1191 	cond = port->port.count == 0;  in gs_closed()
1192 	spin_unlock_irq(&port->port_lock);  in gs_closed()
1199 	cancel_delayed_work_sync(&port->push);  in gserial_free_port()
1201 	wait_event(port->close_wait, gs_closed(port));  in gserial_free_port()
1202 	WARN_ON(port->port_usb != NULL);  in gserial_free_port()
1203 	tty_port_destroy(&port->port);  in gserial_free_port()
1241 		if (ret == -EBUSY)  in gserial_alloc_line_no_console()
1253 	tty_dev = tty_port_register_device(&port->port,  in gserial_alloc_line_no_console()
1284  * gserial_connect - notify TTY I/O glue that USB link is active
1297  * before calling this, as well as the appropriate (speed-specific)
1302  * On success, ep->driver_data will be overwritten.
1311 		return -ENXIO;  in gserial_connect()
1316 		return -EINVAL;  in gserial_connect()
1318 	if (port->port_usb) {  in gserial_connect()
1320 		return -EBUSY;  in gserial_connect()
1324 	status = usb_ep_enable(gser->in);  in gserial_connect()
1327 	gser->in->driver_data = port;  in gserial_connect()
1329 	status = usb_ep_enable(gser->out);  in gserial_connect()
1332 	gser->out->driver_data = port;  in gserial_connect()
1335 	spin_lock_irqsave(&port->port_lock, flags);  in gserial_connect()
1336 	gser->ioport = port;  in gserial_connect()
1337 	port->port_usb = gser;  in gserial_connect()
1342 	gser->port_line_coding = port->port_line_coding;  in gserial_connect()
1349 	if (port->port.count) {  in gserial_connect()
1350 		pr_debug("gserial_connect: start ttyGS%d\n", port->port_num);  in gserial_connect()
1352 		if (gser->connect)  in gserial_connect()
1353 			gser->connect(gser);  in gserial_connect()
1355 		if (gser->disconnect)  in gserial_connect()
1356 			gser->disconnect(gser);  in gserial_connect()
1360 	spin_unlock_irqrestore(&port->port_lock, flags);  in gserial_connect()
1365 	usb_ep_disable(gser->in);  in gserial_connect()
1370  * gserial_disconnect - notify TTY I/O glue that USB link is inactive
1382 	struct gs_port	*port = gser->ioport;  in gserial_disconnect()
1391 	spin_lock(&port->port_lock);  in gserial_disconnect()
1396 	port->port_line_coding = gser->port_line_coding;  in gserial_disconnect()
1398 	port->port_usb = NULL;  in gserial_disconnect()
1399 	gser->ioport = NULL;  in gserial_disconnect()
1400 	if (port->port.count > 0) {  in gserial_disconnect()
1401 		wake_up_interruptible(&port->drain_wait);  in gserial_disconnect()
1402 		if (port->port.tty)  in gserial_disconnect()
1403 			tty_hangup(port->port.tty);  in gserial_disconnect()
1405 	port->suspended = false;  in gserial_disconnect()
1406 	spin_unlock(&port->port_lock);  in gserial_disconnect()
1410 	usb_ep_disable(gser->out);  in gserial_disconnect()
1411 	usb_ep_disable(gser->in);  in gserial_disconnect()
1414 	spin_lock_irqsave(&port->port_lock, flags);  in gserial_disconnect()
1415 	if (port->port.count == 0)  in gserial_disconnect()
1416 		kfifo_free(&port->port_write_buf);  in gserial_disconnect()
1417 	gs_free_requests(gser->out, &port->read_pool, NULL);  in gserial_disconnect()
1418 	gs_free_requests(gser->out, &port->read_queue, NULL);  in gserial_disconnect()
1419 	gs_free_requests(gser->in, &port->write_pool, NULL);  in gserial_disconnect()
1421 	port->read_allocated = port->read_started =  in gserial_disconnect()
1422 		port->write_allocated = port->write_started = 0;  in gserial_disconnect()
1424 	spin_unlock_irqrestore(&port->port_lock, flags);  in gserial_disconnect()
1434 	port = gser->ioport;  in gserial_suspend()
1441 	spin_lock(&port->port_lock);  in gserial_suspend()
1443 	port->suspended = true;  in gserial_suspend()
1444 	spin_unlock_irqrestore(&port->port_lock, flags);  in gserial_suspend()
1454 	port = gser->ioport;  in gserial_resume()
1461 	spin_lock(&port->port_lock);  in gserial_resume()
1463 	port->suspended = false;  in gserial_resume()
1464 	if (!port->start_delayed) {  in gserial_resume()
1465 		spin_unlock_irqrestore(&port->port_lock, flags);  in gserial_resume()
1469 	pr_debug("delayed start ttyGS%d\n", port->port_num);  in gserial_resume()
1471 	if (gser->connect)  in gserial_resume()
1472 		gser->connect(gser);  in gserial_resume()
1473 	port->start_delayed = false;  in gserial_resume()
1474 	spin_unlock_irqrestore(&port->port_lock, flags);  in gserial_resume()
1489 	driver->driver_name = "g_serial";  in userial_init()
1490 	driver->name = "ttyGS";  in userial_init()
1493 	driver->type = TTY_DRIVER_TYPE_SERIAL;  in userial_init()
1494 	driver->subtype = SERIAL_TYPE_NORMAL;  in userial_init()
1495 	driver->init_termios = tty_std_termios;  in userial_init()
1497 	/* 9600-8-N-1 ... matches defaults expected by "usbser.sys" on  in userial_init()
1498 	 * MS-Windows.  Otherwise, most of these flags shouldn't affect  in userial_init()
1501 	driver->init_termios.c_cflag =  in userial_init()
1503 	driver->init_termios.c_ispeed = 9600;  in userial_init()
1504 	driver->init_termios.c_ospeed = 9600;  in userial_init()