1 // SPDX-License-Identifier: GPL-2.0
3  * USB Serial Converter driver
5  * Copyright (C) 2009 - 2013 Johan Hovold (jhovold@gmail.com)
6  * Copyright (C) 1999 - 2012 Greg Kroah-Hartman (greg@kroah.com)
13  * See Documentation/usb/usb-serial.rst for more information on using this
34 #include <linux/usb.h>
35 #include <linux/usb/serial.h>
39 #define DRIVER_AUTHOR "Greg Kroah-Hartman <gregkh@linuxfoundation.org>"
40 #define DRIVER_DESC "USB Serial Driver core"
57  * Look up the serial port structure.  If it is found and it hasn't been
64 	struct usb_serial_port *port;  in usb_serial_port_get_by_minor()  local
67 	port = idr_find(&serial_minors, minor);  in usb_serial_port_get_by_minor()
68 	if (!port)  in usb_serial_port_get_by_minor()
71 	serial = port->serial;  in usb_serial_port_get_by_minor()
72 	mutex_lock(&serial->disc_mutex);  in usb_serial_port_get_by_minor()
73 	if (serial->disconnected) {  in usb_serial_port_get_by_minor()
74 		mutex_unlock(&serial->disc_mutex);  in usb_serial_port_get_by_minor()
75 		port = NULL;  in usb_serial_port_get_by_minor()
77 		kref_get(&serial->kref);  in usb_serial_port_get_by_minor()
81 	return port;  in usb_serial_port_get_by_minor()
86 	struct usb_serial_port *port;  in allocate_minors()  local
90 	dev_dbg(&serial->interface->dev, "%s %d\n", __func__, num_ports);  in allocate_minors()
94 		port = serial->port[i];  in allocate_minors()
95 		minor = idr_alloc(&serial_minors, port, 0,  in allocate_minors()
99 		port->minor = minor;  in allocate_minors()
100 		port->port_number = i;  in allocate_minors()
102 	serial->minors_reserved = 1;  in allocate_minors()
108 		idr_remove(&serial_minors, serial->port[j]->minor);  in allocate_minors()
118 	for (i = 0; i < serial->num_ports; ++i)  in release_minors()
119 		idr_remove(&serial_minors, serial->port[i]->minor);  in release_minors()
121 	serial->minors_reserved = 0;  in release_minors()
127 	struct usb_serial_port *port;  in destroy_serial()  local
133 	if (serial->minors_reserved)  in destroy_serial()
136 	if (serial->attached && serial->type->release)  in destroy_serial()
137 		serial->type->release(serial);  in destroy_serial()
140 	for (i = 0; i < serial->num_port_pointers; ++i) {  in destroy_serial()
141 		port = serial->port[i];  in destroy_serial()
142 		if (port) {  in destroy_serial()
143 			port->serial = NULL;  in destroy_serial()
144 			put_device(&port->dev);  in destroy_serial()
148 	usb_put_intf(serial->interface);  in destroy_serial()
149 	usb_put_dev(serial->dev);  in destroy_serial()
155 	kref_put(&serial->kref, destroy_serial);  in usb_serial_put()
163  * serial_install - install tty
164  * @driver: the driver (USB in our case)
168  * USB serial settings but permit them to be overridden by
169  * serial->type->init_termios on first open.
173  * where we store a pointer to the port, and where we do an autoresume.
178 	int idx = tty->index;  in serial_install()
180 	struct usb_serial_port *port;  in serial_install()  local
182 	int retval = -ENODEV;  in serial_install()
184 	port = usb_serial_port_get_by_minor(idx);  in serial_install()
185 	if (!port)  in serial_install()
188 	serial = port->serial;  in serial_install()
189 	if (!try_module_get(serial->type->driver.owner))  in serial_install()
192 	retval = usb_autopm_get_interface(serial->interface);  in serial_install()
196 	init_termios = (driver->termios[idx] == NULL);  in serial_install()
202 	mutex_unlock(&serial->disc_mutex);  in serial_install()
205 	if (init_termios && serial->type->init_termios)  in serial_install()
206 		serial->type->init_termios(tty);  in serial_install()
208 	tty->driver_data = port;  in serial_install()
213 	usb_autopm_put_interface(serial->interface);  in serial_install()
215 	module_put(serial->type->driver.owner);  in serial_install()
218 	mutex_unlock(&serial->disc_mutex);  in serial_install()
224 	struct usb_serial_port *port =  in serial_port_activate()  local
225 		container_of(tport, struct usb_serial_port, port);  in serial_port_activate()
226 	struct usb_serial *serial = port->serial;  in serial_port_activate()
229 	mutex_lock(&serial->disc_mutex);  in serial_port_activate()
230 	if (serial->disconnected)  in serial_port_activate()
231 		retval = -ENODEV;  in serial_port_activate()
233 		retval = port->serial->type->open(tty, port);  in serial_port_activate()
234 	mutex_unlock(&serial->disc_mutex);  in serial_port_activate()
244 	struct usb_serial_port *port = tty->driver_data;  in serial_open()  local
246 	dev_dbg(tty->dev, "%s\n", __func__);  in serial_open()
248 	return tty_port_open(&port->port, tty, filp);  in serial_open()
252  * serial_port_shutdown - shut down hardware
253  * @tport: tty port to shut down
255  * Shut down a USB serial port. Serialized against activate by the
263 	struct usb_serial_port *port =  in serial_port_shutdown()  local
264 		container_of(tport, struct usb_serial_port, port);  in serial_port_shutdown()
265 	struct usb_serial_driver *drv = port->serial->type;  in serial_port_shutdown()
267 	if (drv->close)  in serial_port_shutdown()
268 		drv->close(port);  in serial_port_shutdown()
273 	struct usb_serial_port *port = tty->driver_data;  in serial_hangup()  local
275 	dev_dbg(tty->dev, "%s\n", __func__);  in serial_hangup()
277 	tty_port_hangup(&port->port);  in serial_hangup()
282 	struct usb_serial_port *port = tty->driver_data;  in serial_close()  local
284 	dev_dbg(tty->dev, "%s\n", __func__);  in serial_close()
286 	tty_port_close(&port->port, tty, filp);  in serial_close()
290  * serial_cleanup - free resources post close/hangup
293  * Do the resource freeing and refcount dropping for the port.
300 	struct usb_serial_port *port = tty->driver_data;  in serial_cleanup()  local
304 	dev_dbg(tty->dev, "%s\n", __func__);  in serial_cleanup()
309 	if (port->port.console)  in serial_cleanup()
312 	tty->driver_data = NULL;  in serial_cleanup()
314 	serial = port->serial;  in serial_cleanup()
315 	owner = serial->type->driver.owner;  in serial_cleanup()
317 	usb_autopm_put_interface(serial->interface);  in serial_cleanup()
326 	struct usb_serial_port *port = tty->driver_data;  in serial_write()  local
327 	int retval = -ENODEV;  in serial_write()
329 	if (port->serial->dev->state == USB_STATE_NOTATTACHED)  in serial_write()
332 	dev_dbg(tty->dev, "%s - %d byte(s)\n", __func__, count);  in serial_write()
334 	retval = port->serial->type->write(tty, port, buf, count);  in serial_write()
343 	struct usb_serial_port *port = tty->driver_data;  in serial_write_room()  local
345 	dev_dbg(tty->dev, "%s\n", __func__);  in serial_write_room()
347 	return port->serial->type->write_room(tty);  in serial_write_room()
352 	struct usb_serial_port *port = tty->driver_data;  in serial_chars_in_buffer()  local
353 	struct usb_serial *serial = port->serial;  in serial_chars_in_buffer()
355 	dev_dbg(tty->dev, "%s\n", __func__);  in serial_chars_in_buffer()
357 	if (serial->disconnected)  in serial_chars_in_buffer()
360 	return serial->type->chars_in_buffer(tty);  in serial_chars_in_buffer()
365 	struct usb_serial_port *port = tty->driver_data;  in serial_wait_until_sent()  local
366 	struct usb_serial *serial = port->serial;  in serial_wait_until_sent()
368 	dev_dbg(tty->dev, "%s\n", __func__);  in serial_wait_until_sent()
370 	if (!port->serial->type->wait_until_sent)  in serial_wait_until_sent()
373 	mutex_lock(&serial->disc_mutex);  in serial_wait_until_sent()
374 	if (!serial->disconnected)  in serial_wait_until_sent()
375 		port->serial->type->wait_until_sent(tty, timeout);  in serial_wait_until_sent()
376 	mutex_unlock(&serial->disc_mutex);  in serial_wait_until_sent()
381 	struct usb_serial_port *port = tty->driver_data;  in serial_throttle()  local
383 	dev_dbg(tty->dev, "%s\n", __func__);  in serial_throttle()
385 	if (port->serial->type->throttle)  in serial_throttle()
386 		port->serial->type->throttle(tty);  in serial_throttle()
391 	struct usb_serial_port *port = tty->driver_data;  in serial_unthrottle()  local
393 	dev_dbg(tty->dev, "%s\n", __func__);  in serial_unthrottle()
395 	if (port->serial->type->unthrottle)  in serial_unthrottle()
396 		port->serial->type->unthrottle(tty);  in serial_unthrottle()
401 	struct usb_serial_port *port = tty->driver_data;  in serial_get_serial()  local
403 	if (port->serial->type->get_serial)  in serial_get_serial()
404 		return port->serial->type->get_serial(tty, ss);  in serial_get_serial()
405 	return -ENOTTY;  in serial_get_serial()
410 	struct usb_serial_port *port = tty->driver_data;  in serial_set_serial()  local
412 	if (port->serial->type->set_serial)  in serial_set_serial()
413 		return port->serial->type->set_serial(tty, ss);  in serial_set_serial()
414 	return -ENOTTY;  in serial_set_serial()
420 	struct usb_serial_port *port = tty->driver_data;  in serial_ioctl()  local
421 	int retval = -ENOIOCTLCMD;  in serial_ioctl()
423 	dev_dbg(tty->dev, "%s - cmd 0x%04x\n", __func__, cmd);  in serial_ioctl()
427 		if (port->serial->type->tiocmiwait)  in serial_ioctl()
428 			retval = port->serial->type->tiocmiwait(tty, arg);  in serial_ioctl()
431 		if (port->serial->type->ioctl)  in serial_ioctl()
432 			retval = port->serial->type->ioctl(tty, cmd, arg);  in serial_ioctl()
440 	struct usb_serial_port *port = tty->driver_data;  in serial_set_termios()  local
442 	dev_dbg(tty->dev, "%s\n", __func__);  in serial_set_termios()
444 	if (port->serial->type->set_termios)  in serial_set_termios()
445 		port->serial->type->set_termios(tty, port, old);  in serial_set_termios()
447 		tty_termios_copy_hw(&tty->termios, old);  in serial_set_termios()
452 	struct usb_serial_port *port = tty->driver_data;  in serial_break()  local
454 	dev_dbg(tty->dev, "%s\n", __func__);  in serial_break()
456 	if (port->serial->type->break_ctl)  in serial_break()
457 		port->serial->type->break_ctl(tty, break_state);  in serial_break()
465 	struct usb_serial_port *port;  in serial_proc_show()  local
471 		port = usb_serial_port_get_by_minor(i);  in serial_proc_show()
472 		if (port == NULL)  in serial_proc_show()
474 		serial = port->serial;  in serial_proc_show()
477 		if (serial->type->driver.owner)  in serial_proc_show()
479 				module_name(serial->type->driver.owner));  in serial_proc_show()
481 				serial->type->description);  in serial_proc_show()
483 			le16_to_cpu(serial->dev->descriptor.idVendor),  in serial_proc_show()
484 			le16_to_cpu(serial->dev->descriptor.idProduct));  in serial_proc_show()
485 		seq_printf(m, " num_ports:%d", serial->num_ports);  in serial_proc_show()
486 		seq_printf(m, " port:%d", port->port_number);  in serial_proc_show()
487 		usb_make_path(serial->dev, tmp, sizeof(tmp));  in serial_proc_show()
492 		mutex_unlock(&serial->disc_mutex);  in serial_proc_show()
499 	struct usb_serial_port *port = tty->driver_data;  in serial_tiocmget()  local
501 	dev_dbg(tty->dev, "%s\n", __func__);  in serial_tiocmget()
503 	if (port->serial->type->tiocmget)  in serial_tiocmget()
504 		return port->serial->type->tiocmget(tty);  in serial_tiocmget()
505 	return -EINVAL;  in serial_tiocmget()
511 	struct usb_serial_port *port = tty->driver_data;  in serial_tiocmset()  local
513 	dev_dbg(tty->dev, "%s\n", __func__);  in serial_tiocmset()
515 	if (port->serial->type->tiocmset)  in serial_tiocmset()
516 		return port->serial->type->tiocmset(tty, set, clear);  in serial_tiocmset()
517 	return -EINVAL;  in serial_tiocmset()
523 	struct usb_serial_port *port = tty->driver_data;  in serial_get_icount()  local
525 	dev_dbg(tty->dev, "%s\n", __func__);  in serial_get_icount()
527 	if (port->serial->type->get_icount)  in serial_get_icount()
528 		return port->serial->type->get_icount(tty, icount);  in serial_get_icount()
529 	return -EINVAL;  in serial_get_icount()
534  * disciplines have an annoying habit of calling tty->write from
537 void usb_serial_port_softint(struct usb_serial_port *port)  in usb_serial_port_softint()  argument
539 	schedule_work(&port->work);  in usb_serial_port_softint()
545 	struct usb_serial_port *port =  in usb_serial_port_work()  local
548 	tty_port_tty_wakeup(&port->port);  in usb_serial_port_work()
551 static void usb_serial_port_poison_urbs(struct usb_serial_port *port)  in usb_serial_port_poison_urbs()  argument
555 	for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i)  in usb_serial_port_poison_urbs()
556 		usb_poison_urb(port->read_urbs[i]);  in usb_serial_port_poison_urbs()
557 	for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)  in usb_serial_port_poison_urbs()
558 		usb_poison_urb(port->write_urbs[i]);  in usb_serial_port_poison_urbs()
560 	usb_poison_urb(port->interrupt_in_urb);  in usb_serial_port_poison_urbs()
561 	usb_poison_urb(port->interrupt_out_urb);  in usb_serial_port_poison_urbs()
564 static void usb_serial_port_unpoison_urbs(struct usb_serial_port *port)  in usb_serial_port_unpoison_urbs()  argument
568 	for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i)  in usb_serial_port_unpoison_urbs()
569 		usb_unpoison_urb(port->read_urbs[i]);  in usb_serial_port_unpoison_urbs()
570 	for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)  in usb_serial_port_unpoison_urbs()
571 		usb_unpoison_urb(port->write_urbs[i]);  in usb_serial_port_unpoison_urbs()
573 	usb_unpoison_urb(port->interrupt_in_urb);  in usb_serial_port_unpoison_urbs()
574 	usb_unpoison_urb(port->interrupt_out_urb);  in usb_serial_port_unpoison_urbs()
579 	struct usb_serial_port *port = to_usb_serial_port(dev);  in usb_serial_port_release()  local
584 	usb_free_urb(port->interrupt_in_urb);  in usb_serial_port_release()
585 	usb_free_urb(port->interrupt_out_urb);  in usb_serial_port_release()
586 	for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) {  in usb_serial_port_release()
587 		usb_free_urb(port->read_urbs[i]);  in usb_serial_port_release()
588 		kfree(port->bulk_in_buffers[i]);  in usb_serial_port_release()
590 	for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) {  in usb_serial_port_release()
591 		usb_free_urb(port->write_urbs[i]);  in usb_serial_port_release()
592 		kfree(port->bulk_out_buffers[i]);  in usb_serial_port_release()
594 	kfifo_free(&port->write_fifo);  in usb_serial_port_release()
595 	kfree(port->interrupt_in_buffer);  in usb_serial_port_release()
596 	kfree(port->interrupt_out_buffer);  in usb_serial_port_release()
597 	tty_port_destroy(&port->port);  in usb_serial_port_release()
598 	kfree(port);  in usb_serial_port_release()
610 	serial->dev = usb_get_dev(dev);  in create_serial()
611 	serial->type = driver;  in create_serial()
612 	serial->interface = usb_get_intf(interface);  in create_serial()
613 	kref_init(&serial->kref);  in create_serial()
614 	mutex_init(&serial->disc_mutex);  in create_serial()
615 	serial->minors_reserved = 0;  in create_serial()
625 	spin_lock(&drv->dynids.lock);  in match_dynamic_id()
626 	list_for_each_entry(dynid, &drv->dynids.list, node) {  in match_dynamic_id()
627 		if (usb_match_one_id(intf, &dynid->id)) {  in match_dynamic_id()
628 			spin_unlock(&drv->dynids.lock);  in match_dynamic_id()
629 			return &dynid->id;  in match_dynamic_id()
632 	spin_unlock(&drv->dynids.lock);  in match_dynamic_id()
639 	const struct usb_device_id *id;  in get_iface_id()  local
641 	id = usb_match_id(intf, drv->id_table);  in get_iface_id()
642 	if (id) {  in get_iface_id()
643 		dev_dbg(&intf->dev, "static descriptor matches\n");  in get_iface_id()
646 	id = match_dynamic_id(intf, drv);  in get_iface_id()
647 	if (id)  in get_iface_id()
648 		dev_dbg(&intf->dev, "dynamic descriptor matches\n");  in get_iface_id()
650 	return id;  in get_iface_id()
657 	const struct usb_device_id *id = NULL;  in search_serial_device()  local
659 	struct usb_driver *driver = to_usb_driver(iface->dev.driver);  in search_serial_device()
661 	/* Check if the usb id matches a known device */  in search_serial_device()
663 		if (drv->usb_driver == driver)  in search_serial_device()
664 			id = get_iface_id(drv, iface);  in search_serial_device()
665 		if (id)  in search_serial_device()
672 static int serial_port_carrier_raised(struct tty_port *port)  in serial_port_carrier_raised()  argument
674 	struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);  in serial_port_carrier_raised()
675 	struct usb_serial_driver *drv = p->serial->type;  in serial_port_carrier_raised()
677 	if (drv->carrier_raised)  in serial_port_carrier_raised()
678 		return drv->carrier_raised(p);  in serial_port_carrier_raised()
679 	/* No carrier control - don't block */  in serial_port_carrier_raised()
683 static void serial_port_dtr_rts(struct tty_port *port, int on)  in serial_port_dtr_rts()  argument
685 	struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);  in serial_port_dtr_rts()
686 	struct usb_serial_driver *drv = p->serial->type;  in serial_port_dtr_rts()
688 	if (drv->dtr_rts)  in serial_port_dtr_rts()
689 		drv->dtr_rts(p, on);  in serial_port_dtr_rts()
695 	struct usb_serial_port *port = to_usb_serial_port(dev);  in port_number_show()  local
697 	return sprintf(buf, "%u\n", port->port_number);  in port_number_show()
717 	struct device *dev = &serial->interface->dev;  in find_endpoints()
722 	BUILD_BUG_ON(ARRAY_SIZE(epds->bulk_in) < USB_MAXENDPOINTS / 2);  in find_endpoints()
723 	BUILD_BUG_ON(ARRAY_SIZE(epds->bulk_out) < USB_MAXENDPOINTS / 2);  in find_endpoints()
724 	BUILD_BUG_ON(ARRAY_SIZE(epds->interrupt_in) < USB_MAXENDPOINTS / 2);  in find_endpoints()
725 	BUILD_BUG_ON(ARRAY_SIZE(epds->interrupt_out) < USB_MAXENDPOINTS / 2);  in find_endpoints()
727 	iface_desc = serial->interface->cur_altsetting;  in find_endpoints()
728 	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {  in find_endpoints()
729 		epd = &iface_desc->endpoint[i].desc;  in find_endpoints()
733 			epds->bulk_in[epds->num_bulk_in++] = epd;  in find_endpoints()
736 			epds->bulk_out[epds->num_bulk_out++] = epd;  in find_endpoints()
739 			epds->interrupt_in[epds->num_interrupt_in++] = epd;  in find_endpoints()
742 			epds->interrupt_out[epds->num_interrupt_out++] = epd;  in find_endpoints()
747 static int setup_port_bulk_in(struct usb_serial_port *port,  in setup_port_bulk_in()  argument
750 	struct usb_serial_driver *type = port->serial->type;  in setup_port_bulk_in()
751 	struct usb_device *udev = port->serial->dev;  in setup_port_bulk_in()
755 	buffer_size = max_t(int, type->bulk_in_size, usb_endpoint_maxp(epd));  in setup_port_bulk_in()
756 	port->bulk_in_size = buffer_size;  in setup_port_bulk_in()
757 	port->bulk_in_endpointAddress = epd->bEndpointAddress;  in setup_port_bulk_in()
759 	for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) {  in setup_port_bulk_in()
760 		set_bit(i, &port->read_urbs_free);  in setup_port_bulk_in()
761 		port->read_urbs[i] = usb_alloc_urb(0, GFP_KERNEL);  in setup_port_bulk_in()
762 		if (!port->read_urbs[i])  in setup_port_bulk_in()
763 			return -ENOMEM;  in setup_port_bulk_in()
764 		port->bulk_in_buffers[i] = kmalloc(buffer_size, GFP_KERNEL);  in setup_port_bulk_in()
765 		if (!port->bulk_in_buffers[i])  in setup_port_bulk_in()
766 			return -ENOMEM;  in setup_port_bulk_in()
767 		usb_fill_bulk_urb(port->read_urbs[i], udev,  in setup_port_bulk_in()
768 				usb_rcvbulkpipe(udev, epd->bEndpointAddress),  in setup_port_bulk_in()
769 				port->bulk_in_buffers[i], buffer_size,  in setup_port_bulk_in()
770 				type->read_bulk_callback, port);  in setup_port_bulk_in()
773 	port->read_urb = port->read_urbs[0];  in setup_port_bulk_in()
774 	port->bulk_in_buffer = port->bulk_in_buffers[0];  in setup_port_bulk_in()
779 static int setup_port_bulk_out(struct usb_serial_port *port,  in setup_port_bulk_out()  argument
782 	struct usb_serial_driver *type = port->serial->type;  in setup_port_bulk_out()
783 	struct usb_device *udev = port->serial->dev;  in setup_port_bulk_out()
787 	if (kfifo_alloc(&port->write_fifo, PAGE_SIZE, GFP_KERNEL))  in setup_port_bulk_out()
788 		return -ENOMEM;  in setup_port_bulk_out()
789 	if (type->bulk_out_size)  in setup_port_bulk_out()
790 		buffer_size = type->bulk_out_size;  in setup_port_bulk_out()
793 	port->bulk_out_size = buffer_size;  in setup_port_bulk_out()
794 	port->bulk_out_endpointAddress = epd->bEndpointAddress;  in setup_port_bulk_out()
796 	for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) {  in setup_port_bulk_out()
797 		set_bit(i, &port->write_urbs_free);  in setup_port_bulk_out()
798 		port->write_urbs[i] = usb_alloc_urb(0, GFP_KERNEL);  in setup_port_bulk_out()
799 		if (!port->write_urbs[i])  in setup_port_bulk_out()
800 			return -ENOMEM;  in setup_port_bulk_out()
801 		port->bulk_out_buffers[i] = kmalloc(buffer_size, GFP_KERNEL);  in setup_port_bulk_out()
802 		if (!port->bulk_out_buffers[i])  in setup_port_bulk_out()
803 			return -ENOMEM;  in setup_port_bulk_out()
804 		usb_fill_bulk_urb(port->write_urbs[i], udev,  in setup_port_bulk_out()
805 				usb_sndbulkpipe(udev, epd->bEndpointAddress),  in setup_port_bulk_out()
806 				port->bulk_out_buffers[i], buffer_size,  in setup_port_bulk_out()
807 				type->write_bulk_callback, port);  in setup_port_bulk_out()
810 	port->write_urb = port->write_urbs[0];  in setup_port_bulk_out()
811 	port->bulk_out_buffer = port->bulk_out_buffers[0];  in setup_port_bulk_out()
816 static int setup_port_interrupt_in(struct usb_serial_port *port,  in setup_port_interrupt_in()  argument
819 	struct usb_serial_driver *type = port->serial->type;  in setup_port_interrupt_in()
820 	struct usb_device *udev = port->serial->dev;  in setup_port_interrupt_in()
823 	port->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);  in setup_port_interrupt_in()
824 	if (!port->interrupt_in_urb)  in setup_port_interrupt_in()
825 		return -ENOMEM;  in setup_port_interrupt_in()
827 	port->interrupt_in_endpointAddress = epd->bEndpointAddress;  in setup_port_interrupt_in()
828 	port->interrupt_in_buffer = kmalloc(buffer_size, GFP_KERNEL);  in setup_port_interrupt_in()
829 	if (!port->interrupt_in_buffer)  in setup_port_interrupt_in()
830 		return -ENOMEM;  in setup_port_interrupt_in()
831 	usb_fill_int_urb(port->interrupt_in_urb, udev,  in setup_port_interrupt_in()
832 			usb_rcvintpipe(udev, epd->bEndpointAddress),  in setup_port_interrupt_in()
833 			port->interrupt_in_buffer, buffer_size,  in setup_port_interrupt_in()
834 			type->read_int_callback, port,  in setup_port_interrupt_in()
835 			epd->bInterval);  in setup_port_interrupt_in()
840 static int setup_port_interrupt_out(struct usb_serial_port *port,  in setup_port_interrupt_out()  argument
843 	struct usb_serial_driver *type = port->serial->type;  in setup_port_interrupt_out()
844 	struct usb_device *udev = port->serial->dev;  in setup_port_interrupt_out()
847 	port->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);  in setup_port_interrupt_out()
848 	if (!port->interrupt_out_urb)  in setup_port_interrupt_out()
849 		return -ENOMEM;  in setup_port_interrupt_out()
851 	port->interrupt_out_size = buffer_size;  in setup_port_interrupt_out()
852 	port->interrupt_out_endpointAddress = epd->bEndpointAddress;  in setup_port_interrupt_out()
853 	port->interrupt_out_buffer = kmalloc(buffer_size, GFP_KERNEL);  in setup_port_interrupt_out()
854 	if (!port->interrupt_out_buffer)  in setup_port_interrupt_out()
855 		return -ENOMEM;  in setup_port_interrupt_out()
856 	usb_fill_int_urb(port->interrupt_out_urb, udev,  in setup_port_interrupt_out()
857 			usb_sndintpipe(udev, epd->bEndpointAddress),  in setup_port_interrupt_out()
858 			port->interrupt_out_buffer, buffer_size,  in setup_port_interrupt_out()
859 			type->write_int_callback, port,  in setup_port_interrupt_out()
860 			epd->bInterval);  in setup_port_interrupt_out()
866 			       const struct usb_device_id *id)  in usb_serial_probe()  argument
868 	struct device *ddev = &interface->dev;  in usb_serial_probe()
871 	struct usb_serial_port *port;  in usb_serial_probe()  local
884 		return -ENODEV;  in usb_serial_probe()
887 	if (!try_module_get(type->driver.owner)) {  in usb_serial_probe()
890 		return -EIO;  in usb_serial_probe()
896 		retval = -ENOMEM;  in usb_serial_probe()
901 	if (type->probe) {  in usb_serial_probe()
902 		const struct usb_device_id *id;  in usb_serial_probe()  local
904 		id = get_iface_id(type, interface);  in usb_serial_probe()
905 		retval = type->probe(serial, id);  in usb_serial_probe()
916 		retval = -ENOMEM;  in usb_serial_probe()
922 	if (epds->num_bulk_in < type->num_bulk_in ||  in usb_serial_probe()
923 			epds->num_bulk_out < type->num_bulk_out ||  in usb_serial_probe()
924 			epds->num_interrupt_in < type->num_interrupt_in ||  in usb_serial_probe()
925 			epds->num_interrupt_out < type->num_interrupt_out) {  in usb_serial_probe()
927 		retval = -ENODEV;  in usb_serial_probe()
931 	if (type->calc_num_ports) {  in usb_serial_probe()
932 		retval = type->calc_num_ports(serial, epds);  in usb_serial_probe()
939 		num_ports = type->num_ports;  in usb_serial_probe()
946 	serial->num_ports = (unsigned char)num_ports;  in usb_serial_probe()
947 	serial->num_bulk_in = epds->num_bulk_in;  in usb_serial_probe()
948 	serial->num_bulk_out = epds->num_bulk_out;  in usb_serial_probe()
949 	serial->num_interrupt_in = epds->num_interrupt_in;  in usb_serial_probe()
950 	serial->num_interrupt_out = epds->num_interrupt_out;  in usb_serial_probe()
953 	dev_info(ddev, "%s converter detected\n", type->description);  in usb_serial_probe()
958 	max_endpoints = max(epds->num_bulk_in, epds->num_bulk_out);  in usb_serial_probe()
959 	max_endpoints = max(max_endpoints, epds->num_interrupt_in);  in usb_serial_probe()
960 	max_endpoints = max(max_endpoints, epds->num_interrupt_out);  in usb_serial_probe()
961 	max_endpoints = max(max_endpoints, serial->num_ports);  in usb_serial_probe()
962 	serial->num_port_pointers = max_endpoints;  in usb_serial_probe()
964 	dev_dbg(ddev, "setting up %d port structure(s)\n", max_endpoints);  in usb_serial_probe()
966 		port = kzalloc(sizeof(struct usb_serial_port), GFP_KERNEL);  in usb_serial_probe()
967 		if (!port) {  in usb_serial_probe()
968 			retval = -ENOMEM;  in usb_serial_probe()
971 		tty_port_init(&port->port);  in usb_serial_probe()
972 		port->port.ops = &serial_port_ops;  in usb_serial_probe()
973 		port->serial = serial;  in usb_serial_probe()
974 		spin_lock_init(&port->lock);  in usb_serial_probe()
977 		INIT_WORK(&port->work, usb_serial_port_work);  in usb_serial_probe()
978 		serial->port[i] = port;  in usb_serial_probe()
979 		port->dev.parent = &interface->dev;  in usb_serial_probe()
980 		port->dev.driver = NULL;  in usb_serial_probe()
981 		port->dev.bus = &usb_serial_bus_type;  in usb_serial_probe()
982 		port->dev.release = &usb_serial_port_release;  in usb_serial_probe()
983 		port->dev.groups = usb_serial_port_groups;  in usb_serial_probe()
984 		device_initialize(&port->dev);  in usb_serial_probe()
988 	for (i = 0; i < epds->num_bulk_in; ++i) {  in usb_serial_probe()
989 		retval = setup_port_bulk_in(serial->port[i], epds->bulk_in[i]);  in usb_serial_probe()
994 	for (i = 0; i < epds->num_bulk_out; ++i) {  in usb_serial_probe()
995 		retval = setup_port_bulk_out(serial->port[i],  in usb_serial_probe()
996 				epds->bulk_out[i]);  in usb_serial_probe()
1001 	if (serial->type->read_int_callback) {  in usb_serial_probe()
1002 		for (i = 0; i < epds->num_interrupt_in; ++i) {  in usb_serial_probe()
1003 			retval = setup_port_interrupt_in(serial->port[i],  in usb_serial_probe()
1004 					epds->interrupt_in[i]);  in usb_serial_probe()
1008 	} else if (epds->num_interrupt_in) {  in usb_serial_probe()
1012 	if (serial->type->write_int_callback) {  in usb_serial_probe()
1013 		for (i = 0; i < epds->num_interrupt_out; ++i) {  in usb_serial_probe()
1014 			retval = setup_port_interrupt_out(serial->port[i],  in usb_serial_probe()
1015 					epds->interrupt_out[i]);  in usb_serial_probe()
1019 	} else if (epds->num_interrupt_out) {  in usb_serial_probe()
1026 	if (type->attach) {  in usb_serial_probe()
1027 		retval = type->attach(serial);  in usb_serial_probe()
1030 		serial->attached = 1;  in usb_serial_probe()
1033 			   serial port as it's about to disappear */  in usb_serial_probe()
1034 			serial->num_ports = 0;  in usb_serial_probe()
1038 		serial->attached = 1;  in usb_serial_probe()
1049 		port = serial->port[i];  in usb_serial_probe()
1050 		dev_set_name(&port->dev, "ttyUSB%d", port->minor);  in usb_serial_probe()
1051 		dev_dbg(ddev, "registering %s\n", dev_name(&port->dev));  in usb_serial_probe()
1052 		device_enable_async_suspend(&port->dev);  in usb_serial_probe()
1054 		retval = device_add(&port->dev);  in usb_serial_probe()
1056 			dev_err(ddev, "Error registering port device, continuing\n");  in usb_serial_probe()
1060 		usb_serial_console_init(serial->port[0]->minor);  in usb_serial_probe()
1063 	module_put(type->driver.owner);  in usb_serial_probe()
1071 	module_put(type->driver.owner);  in usb_serial_probe()
1080 	struct device *dev = &interface->dev;  in usb_serial_disconnect()
1081 	struct usb_serial_port *port;  in usb_serial_disconnect()  local
1086 	mutex_lock(&serial->disc_mutex);  in usb_serial_disconnect()
1088 	serial->disconnected = 1;  in usb_serial_disconnect()
1089 	mutex_unlock(&serial->disc_mutex);  in usb_serial_disconnect()
1091 	for (i = 0; i < serial->num_ports; ++i) {  in usb_serial_disconnect()
1092 		port = serial->port[i];  in usb_serial_disconnect()
1093 		tty = tty_port_tty_get(&port->port);  in usb_serial_disconnect()
1098 		usb_serial_port_poison_urbs(port);  in usb_serial_disconnect()
1099 		wake_up_interruptible(&port->port.delta_msr_wait);  in usb_serial_disconnect()
1100 		cancel_work_sync(&port->work);  in usb_serial_disconnect()
1101 		if (device_is_registered(&port->dev))  in usb_serial_disconnect()
1102 			device_del(&port->dev);  in usb_serial_disconnect()
1104 	if (serial->type->disconnect)  in usb_serial_disconnect()
1105 		serial->type->disconnect(serial);  in usb_serial_disconnect()
1117 	serial->suspending = 1;  in usb_serial_suspend()
1120 	 * serial->type->suspend() MUST return 0 in system sleep context,  in usb_serial_suspend()
1124 	if (serial->type->suspend) {  in usb_serial_suspend()
1125 		r = serial->type->suspend(serial, message);  in usb_serial_suspend()
1127 			serial->suspending = 0;  in usb_serial_suspend()
1132 	for (i = 0; i < serial->num_ports; ++i)  in usb_serial_suspend()
1133 		usb_serial_port_poison_urbs(serial->port[i]);  in usb_serial_suspend()
1143 	for (i = 0; i < serial->num_ports; ++i)  in usb_serial_unpoison_port_urbs()
1144 		usb_serial_port_unpoison_urbs(serial->port[i]);  in usb_serial_unpoison_port_urbs()
1154 	serial->suspending = 0;  in usb_serial_resume()
1155 	if (serial->type->resume)  in usb_serial_resume()
1156 		rv = serial->type->resume(serial);  in usb_serial_resume()
1171 	serial->suspending = 0;  in usb_serial_reset_resume()
1172 	if (serial->type->reset_resume) {  in usb_serial_reset_resume()
1173 		rv = serial->type->reset_resume(serial);  in usb_serial_reset_resume()
1175 		rv = -EOPNOTSUPP;  in usb_serial_reset_resume()
1176 		intf->needs_binding = 1;  in usb_serial_reset_resume()
1214 		return -ENOMEM;  in usb_serial_init()
1219 		pr_err("%s - registering bus driver failed\n", __func__);  in usb_serial_init()
1223 	usb_serial_tty_driver->driver_name = "usbserial";  in usb_serial_init()
1224 	usb_serial_tty_driver->name = "ttyUSB";  in usb_serial_init()
1225 	usb_serial_tty_driver->major = USB_SERIAL_TTY_MAJOR;  in usb_serial_init()
1226 	usb_serial_tty_driver->minor_start = 0;  in usb_serial_init()
1227 	usb_serial_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;  in usb_serial_init()
1228 	usb_serial_tty_driver->subtype = SERIAL_TYPE_NORMAL;  in usb_serial_init()
1229 	usb_serial_tty_driver->flags = TTY_DRIVER_REAL_RAW |  in usb_serial_init()
1231 	usb_serial_tty_driver->init_termios = tty_std_termios;  in usb_serial_init()
1232 	usb_serial_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD  in usb_serial_init()
1234 	usb_serial_tty_driver->init_termios.c_ispeed = 9600;  in usb_serial_init()
1235 	usb_serial_tty_driver->init_termios.c_ospeed = 9600;  in usb_serial_init()
1239 		pr_err("%s - tty_register_driver failed\n", __func__);  in usb_serial_init()
1246 		pr_err("%s - registering generic driver failed\n", __func__);  in usb_serial_init()
1259 	pr_err("%s - returning with error %d\n", __func__, result);  in usb_serial_init()
1283 		if (!type->function) {					\
1284 			type->function = usb_serial_generic_##function;	\
1286 						type->driver.name);	\
1297 	if (device->tx_empty)  in usb_serial_operations_init()
1310 		return -ENODEV;  in usb_serial_register()
1312 	if (!driver->description)  in usb_serial_register()
1313 		driver->description = driver->driver.name;  in usb_serial_register()
1314 	if (!driver->usb_driver) {  in usb_serial_register()
1316 				driver->description);  in usb_serial_register()
1317 		return -EINVAL;  in usb_serial_register()
1321 	driver->driver.suppress_bind_attrs = true;  in usb_serial_register()
1327 	list_add(&driver->driver_list, &usb_serial_driver_list);  in usb_serial_register()
1331 		pr_err("problem %d when registering driver %s\n", retval, driver->description);  in usb_serial_register()
1332 		list_del(&driver->driver_list);  in usb_serial_register()
1334 		pr_info("USB Serial support registered for %s\n", driver->description);  in usb_serial_register()
1342 	pr_info("USB Serial deregistering driver %s\n", device->description);  in usb_serial_deregister()
1345 	list_del(&device->driver_list);  in usb_serial_deregister()
1352  * usb_serial_register_drivers - register drivers for a usb-serial module
1353  * @serial_drivers: NULL-terminated array of pointers to drivers to be registered
1378 	 * Suspend/resume support is implemented in the usb-serial core,  in usb_serial_register_drivers()
1379 	 * so fill in the PM-related fields in udriver.  in usb_serial_register_drivers()
1383 		return -ENOMEM;  in usb_serial_register_drivers()
1385 	udriver->name = name;  in usb_serial_register_drivers()
1386 	udriver->no_dynamic_id = 1;  in usb_serial_register_drivers()
1387 	udriver->supports_autosuspend = 1;  in usb_serial_register_drivers()
1388 	udriver->suspend = usb_serial_suspend;  in usb_serial_register_drivers()
1389 	udriver->resume = usb_serial_resume;  in usb_serial_register_drivers()
1390 	udriver->probe = usb_serial_probe;  in usb_serial_register_drivers()
1391 	udriver->disconnect = usb_serial_disconnect;  in usb_serial_register_drivers()
1395 		if ((*sd)->reset_resume) {  in usb_serial_register_drivers()
1396 			udriver->reset_resume = usb_serial_reset_resume;  in usb_serial_register_drivers()
1406 		(*sd)->usb_driver = udriver;  in usb_serial_register_drivers()
1413 	udriver->id_table = id_table;  in usb_serial_register_drivers()
1414 	rc = driver_attach(&udriver->drvwrap.driver);  in usb_serial_register_drivers()
1418 	while (sd-- > serial_drivers)  in usb_serial_register_drivers()
1428  * usb_serial_deregister_drivers - deregister drivers for a usb-serial module
1429  * @serial_drivers: NULL-terminated array of pointers to drivers to be deregistered
1437 	struct usb_driver *udriver = (*serial_drivers)->usb_driver;  in usb_serial_deregister_drivers()