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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * USB Serial Converter driver
4 *
5 * Copyright (C) 2009 - 2013 Johan Hovold (jhovold@gmail.com)
6 * Copyright (C) 1999 - 2012 Greg Kroah-Hartman (greg@kroah.com)
7 * Copyright (C) 2000 Peter Berger (pberger@brimson.com)
8 * Copyright (C) 2000 Al Borchers (borchers@steinerpoint.com)
9 *
10 * This driver was originally based on the ACM driver by Armin Fuerst (which was
11 * based on a driver by Brad Keryan)
12 *
13 * See Documentation/usb/usb-serial.rst for more information on using this
14 * driver
15 */
16
17#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18
19#include <linux/kernel.h>
20#include <linux/errno.h>
21#include <linux/init.h>
22#include <linux/slab.h>
23#include <linux/tty.h>
24#include <linux/tty_driver.h>
25#include <linux/tty_flip.h>
26#include <linux/module.h>
27#include <linux/moduleparam.h>
28#include <linux/seq_file.h>
29#include <linux/spinlock.h>
30#include <linux/mutex.h>
31#include <linux/list.h>
32#include <linux/uaccess.h>
33#include <linux/serial.h>
34#include <linux/usb.h>
35#include <linux/usb/serial.h>
36#include <linux/kfifo.h>
37#include <linux/idr.h>
38
39#define DRIVER_AUTHOR "Greg Kroah-Hartman <gregkh@linuxfoundation.org>"
40#define DRIVER_DESC "USB Serial Driver core"
41
42#define USB_SERIAL_TTY_MAJOR 188
43#define USB_SERIAL_TTY_MINORS 512 /* should be enough for a while */
44
45/* There is no MODULE_DEVICE_TABLE for usbserial.c. Instead
46 the MODULE_DEVICE_TABLE declarations in each serial driver
47 cause the "hotplug" program to pull in whatever module is necessary
48 via modprobe, and modprobe will load usbserial because the serial
49 drivers depend on it.
50*/
51
52static DEFINE_IDR(serial_minors);
53static DEFINE_MUTEX(table_lock);
54static LIST_HEAD(usb_serial_driver_list);
55
56/*
57 * Look up the serial port structure. If it is found and it hasn't been
58 * disconnected, return with the parent usb_serial structure's disc_mutex held
59 * and its refcount incremented. Otherwise return NULL.
60 */
61struct usb_serial_port *usb_serial_port_get_by_minor(unsigned minor)
62{
63 struct usb_serial *serial;
64 struct usb_serial_port *port;
65
66 mutex_lock(&table_lock);
67 port = idr_find(&serial_minors, minor);
68 if (!port)
69 goto exit;
70
71 serial = port->serial;
72 mutex_lock(&serial->disc_mutex);
73 if (serial->disconnected) {
74 mutex_unlock(&serial->disc_mutex);
75 port = NULL;
76 } else {
77 kref_get(&serial->kref);
78 }
79exit:
80 mutex_unlock(&table_lock);
81 return port;
82}
83
84static int allocate_minors(struct usb_serial *serial, int num_ports)
85{
86 struct usb_serial_port *port;
87 unsigned int i, j;
88 int minor;
89
90 dev_dbg(&serial->interface->dev, "%s %d\n", __func__, num_ports);
91
92 mutex_lock(&table_lock);
93 for (i = 0; i < num_ports; ++i) {
94 port = serial->port[i];
95 minor = idr_alloc(&serial_minors, port, 0,
96 USB_SERIAL_TTY_MINORS, GFP_KERNEL);
97 if (minor < 0)
98 goto error;
99 port->minor = minor;
100 port->port_number = i;
101 }
102 serial->minors_reserved = 1;
103 mutex_unlock(&table_lock);
104 return 0;
105error:
106 /* unwind the already allocated minors */
107 for (j = 0; j < i; ++j)
108 idr_remove(&serial_minors, serial->port[j]->minor);
109 mutex_unlock(&table_lock);
110 return minor;
111}
112
113static void release_minors(struct usb_serial *serial)
114{
115 int i;
116
117 mutex_lock(&table_lock);
118 for (i = 0; i < serial->num_ports; ++i)
119 idr_remove(&serial_minors, serial->port[i]->minor);
120 mutex_unlock(&table_lock);
121 serial->minors_reserved = 0;
122}
123
124int usb_serial_claim_interface(struct usb_serial *serial, struct usb_interface *intf)
125{
126 struct usb_driver *driver = serial->type->usb_driver;
127 int ret;
128
129 if (serial->sibling)
130 return -EBUSY;
131
132 ret = usb_driver_claim_interface(driver, intf, serial);
133 if (ret) {
134 dev_err(&serial->interface->dev,
135 "failed to claim sibling interface: %d\n", ret);
136 return ret;
137 }
138
139 serial->sibling = intf;
140
141 return 0;
142}
143EXPORT_SYMBOL_GPL(usb_serial_claim_interface);
144
145static void release_sibling(struct usb_serial *serial, struct usb_interface *intf)
146{
147 struct usb_driver *driver = serial->type->usb_driver;
148 struct usb_interface *sibling;
149
150 if (!serial->sibling)
151 return;
152
153 if (intf == serial->sibling)
154 sibling = serial->interface;
155 else
156 sibling = serial->sibling;
157
158 usb_set_intfdata(sibling, NULL);
159 usb_driver_release_interface(driver, sibling);
160}
161
162static void destroy_serial(struct kref *kref)
163{
164 struct usb_serial *serial;
165 struct usb_serial_port *port;
166 int i;
167
168 serial = to_usb_serial(kref);
169
170 /* return the minor range that this device had */
171 if (serial->minors_reserved)
172 release_minors(serial);
173
174 if (serial->attached && serial->type->release)
175 serial->type->release(serial);
176
177 /* Now that nothing is using the ports, they can be freed */
178 for (i = 0; i < serial->num_port_pointers; ++i) {
179 port = serial->port[i];
180 if (port) {
181 port->serial = NULL;
182 put_device(&port->dev);
183 }
184 }
185
186 usb_put_intf(serial->interface);
187 usb_put_dev(serial->dev);
188 kfree(serial);
189}
190
191void usb_serial_put(struct usb_serial *serial)
192{
193 kref_put(&serial->kref, destroy_serial);
194}
195
196/*****************************************************************************
197 * Driver tty interface functions
198 *****************************************************************************/
199
200/**
201 * serial_install - install tty
202 * @driver: the driver (USB in our case)
203 * @tty: the tty being created
204 *
205 * Initialise the termios structure for this tty. We use the default
206 * USB serial settings but permit them to be overridden by
207 * serial->type->init_termios on first open.
208 *
209 * This is the first place a new tty gets used. Hence this is where we
210 * acquire references to the usb_serial structure and the driver module,
211 * where we store a pointer to the port. All these actions are reversed
212 * in serial_cleanup().
213 */
214static int serial_install(struct tty_driver *driver, struct tty_struct *tty)
215{
216 int idx = tty->index;
217 struct usb_serial *serial;
218 struct usb_serial_port *port;
219 bool init_termios;
220 int retval = -ENODEV;
221
222 port = usb_serial_port_get_by_minor(idx);
223 if (!port)
224 return retval;
225
226 serial = port->serial;
227 if (!try_module_get(serial->type->driver.owner))
228 goto err_put_serial;
229
230 init_termios = (driver->termios[idx] == NULL);
231
232 retval = tty_standard_install(driver, tty);
233 if (retval)
234 goto err_put_module;
235
236 mutex_unlock(&serial->disc_mutex);
237
238 /* allow the driver to update the initial settings */
239 if (init_termios && serial->type->init_termios)
240 serial->type->init_termios(tty);
241
242 tty->driver_data = port;
243
244 return retval;
245
246err_put_module:
247 module_put(serial->type->driver.owner);
248err_put_serial:
249 usb_serial_put(serial);
250 mutex_unlock(&serial->disc_mutex);
251 return retval;
252}
253
254static int serial_port_activate(struct tty_port *tport, struct tty_struct *tty)
255{
256 struct usb_serial_port *port =
257 container_of(tport, struct usb_serial_port, port);
258 struct usb_serial *serial = port->serial;
259 int retval;
260
261 mutex_lock(&serial->disc_mutex);
262 if (serial->disconnected) {
263 retval = -ENODEV;
264 goto out_unlock;
265 }
266
267 retval = usb_autopm_get_interface(serial->interface);
268 if (retval)
269 goto out_unlock;
270
271 retval = port->serial->type->open(tty, port);
272 if (retval)
273 usb_autopm_put_interface(serial->interface);
274out_unlock:
275 mutex_unlock(&serial->disc_mutex);
276
277 if (retval < 0)
278 retval = usb_translate_errors(retval);
279
280 return retval;
281}
282
283static int serial_open(struct tty_struct *tty, struct file *filp)
284{
285 struct usb_serial_port *port = tty->driver_data;
286
287 dev_dbg(&port->dev, "%s\n", __func__);
288
289 return tty_port_open(&port->port, tty, filp);
290}
291
292/**
293 * serial_port_shutdown - shut down hardware
294 * @tport: tty port to shut down
295 *
296 * Shut down a USB serial port. Serialized against activate by the
297 * tport mutex and kept to matching open/close pairs
298 * of calls by the tty-port initialized flag.
299 *
300 * Not called if tty is console.
301 */
302static void serial_port_shutdown(struct tty_port *tport)
303{
304 struct usb_serial_port *port =
305 container_of(tport, struct usb_serial_port, port);
306 struct usb_serial_driver *drv = port->serial->type;
307
308 if (drv->close)
309 drv->close(port);
310
311 usb_autopm_put_interface(port->serial->interface);
312}
313
314static void serial_hangup(struct tty_struct *tty)
315{
316 struct usb_serial_port *port = tty->driver_data;
317
318 dev_dbg(&port->dev, "%s\n", __func__);
319
320 tty_port_hangup(&port->port);
321}
322
323static void serial_close(struct tty_struct *tty, struct file *filp)
324{
325 struct usb_serial_port *port = tty->driver_data;
326
327 dev_dbg(&port->dev, "%s\n", __func__);
328
329 tty_port_close(&port->port, tty, filp);
330}
331
332/**
333 * serial_cleanup - free resources post close/hangup
334 * @tty: tty to clean up
335 *
336 * Do the resource freeing and refcount dropping for the port.
337 * Avoid freeing the console.
338 *
339 * Called asynchronously after the last tty kref is dropped.
340 */
341static void serial_cleanup(struct tty_struct *tty)
342{
343 struct usb_serial_port *port = tty->driver_data;
344 struct usb_serial *serial;
345 struct module *owner;
346
347 dev_dbg(&port->dev, "%s\n", __func__);
348
349 /* The console is magical. Do not hang up the console hardware
350 * or there will be tears.
351 */
352 if (port->port.console)
353 return;
354
355 tty->driver_data = NULL;
356
357 serial = port->serial;
358 owner = serial->type->driver.owner;
359
360 usb_serial_put(serial);
361 module_put(owner);
362}
363
364static ssize_t serial_write(struct tty_struct *tty, const u8 *buf, size_t count)
365{
366 struct usb_serial_port *port = tty->driver_data;
367 int retval = -ENODEV;
368
369 if (port->serial->dev->state == USB_STATE_NOTATTACHED)
370 goto exit;
371
372 dev_dbg(&port->dev, "%s - %zu byte(s)\n", __func__, count);
373
374 retval = port->serial->type->write(tty, port, buf, count);
375 if (retval < 0)
376 retval = usb_translate_errors(retval);
377exit:
378 return retval;
379}
380
381static unsigned int serial_write_room(struct tty_struct *tty)
382{
383 struct usb_serial_port *port = tty->driver_data;
384
385 dev_dbg(&port->dev, "%s\n", __func__);
386
387 return port->serial->type->write_room(tty);
388}
389
390static unsigned int serial_chars_in_buffer(struct tty_struct *tty)
391{
392 struct usb_serial_port *port = tty->driver_data;
393 struct usb_serial *serial = port->serial;
394
395 dev_dbg(&port->dev, "%s\n", __func__);
396
397 if (serial->disconnected)
398 return 0;
399
400 return serial->type->chars_in_buffer(tty);
401}
402
403static void serial_wait_until_sent(struct tty_struct *tty, int timeout)
404{
405 struct usb_serial_port *port = tty->driver_data;
406 struct usb_serial *serial = port->serial;
407
408 dev_dbg(&port->dev, "%s\n", __func__);
409
410 if (!port->serial->type->wait_until_sent)
411 return;
412
413 mutex_lock(&serial->disc_mutex);
414 if (!serial->disconnected)
415 port->serial->type->wait_until_sent(tty, timeout);
416 mutex_unlock(&serial->disc_mutex);
417}
418
419static void serial_throttle(struct tty_struct *tty)
420{
421 struct usb_serial_port *port = tty->driver_data;
422
423 dev_dbg(&port->dev, "%s\n", __func__);
424
425 if (port->serial->type->throttle)
426 port->serial->type->throttle(tty);
427}
428
429static void serial_unthrottle(struct tty_struct *tty)
430{
431 struct usb_serial_port *port = tty->driver_data;
432
433 dev_dbg(&port->dev, "%s\n", __func__);
434
435 if (port->serial->type->unthrottle)
436 port->serial->type->unthrottle(tty);
437}
438
439static int serial_get_serial(struct tty_struct *tty, struct serial_struct *ss)
440{
441 struct usb_serial_port *port = tty->driver_data;
442 struct tty_port *tport = &port->port;
443 unsigned int close_delay, closing_wait;
444
445 mutex_lock(&tport->mutex);
446
447 close_delay = jiffies_to_msecs(tport->close_delay) / 10;
448 closing_wait = tport->closing_wait;
449 if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
450 closing_wait = jiffies_to_msecs(closing_wait) / 10;
451
452 ss->line = port->minor;
453 ss->close_delay = close_delay;
454 ss->closing_wait = closing_wait;
455
456 if (port->serial->type->get_serial)
457 port->serial->type->get_serial(tty, ss);
458
459 mutex_unlock(&tport->mutex);
460
461 return 0;
462}
463
464static int serial_set_serial(struct tty_struct *tty, struct serial_struct *ss)
465{
466 struct usb_serial_port *port = tty->driver_data;
467 struct tty_port *tport = &port->port;
468 unsigned int close_delay, closing_wait;
469 int ret = 0;
470
471 close_delay = msecs_to_jiffies(ss->close_delay * 10);
472 closing_wait = ss->closing_wait;
473 if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
474 closing_wait = msecs_to_jiffies(closing_wait * 10);
475
476 mutex_lock(&tport->mutex);
477
478 if (!capable(CAP_SYS_ADMIN)) {
479 if (close_delay != tport->close_delay ||
480 closing_wait != tport->closing_wait) {
481 ret = -EPERM;
482 goto out_unlock;
483 }
484 }
485
486 if (port->serial->type->set_serial) {
487 ret = port->serial->type->set_serial(tty, ss);
488 if (ret)
489 goto out_unlock;
490 }
491
492 tport->close_delay = close_delay;
493 tport->closing_wait = closing_wait;
494out_unlock:
495 mutex_unlock(&tport->mutex);
496
497 return ret;
498}
499
500static int serial_ioctl(struct tty_struct *tty,
501 unsigned int cmd, unsigned long arg)
502{
503 struct usb_serial_port *port = tty->driver_data;
504 int retval = -ENOIOCTLCMD;
505
506 dev_dbg(&port->dev, "%s - cmd 0x%04x\n", __func__, cmd);
507
508 switch (cmd) {
509 case TIOCMIWAIT:
510 if (port->serial->type->tiocmiwait)
511 retval = port->serial->type->tiocmiwait(tty, arg);
512 break;
513 default:
514 if (port->serial->type->ioctl)
515 retval = port->serial->type->ioctl(tty, cmd, arg);
516 }
517
518 return retval;
519}
520
521static void serial_set_termios(struct tty_struct *tty,
522 const struct ktermios *old)
523{
524 struct usb_serial_port *port = tty->driver_data;
525
526 dev_dbg(&port->dev, "%s\n", __func__);
527
528 if (port->serial->type->set_termios)
529 port->serial->type->set_termios(tty, port, old);
530 else
531 tty_termios_copy_hw(&tty->termios, old);
532}
533
534static int serial_break(struct tty_struct *tty, int break_state)
535{
536 struct usb_serial_port *port = tty->driver_data;
537
538 dev_dbg(&port->dev, "%s\n", __func__);
539
540 if (port->serial->type->break_ctl)
541 return port->serial->type->break_ctl(tty, break_state);
542
543 return -ENOTTY;
544}
545
546static int serial_proc_show(struct seq_file *m, void *v)
547{
548 struct usb_serial *serial;
549 struct usb_serial_port *port;
550 int i;
551 char tmp[40];
552
553 seq_puts(m, "usbserinfo:1.0 driver:2.0\n");
554 for (i = 0; i < USB_SERIAL_TTY_MINORS; ++i) {
555 port = usb_serial_port_get_by_minor(i);
556 if (port == NULL)
557 continue;
558 serial = port->serial;
559
560 seq_printf(m, "%d:", i);
561 if (serial->type->driver.owner)
562 seq_printf(m, " module:%s",
563 module_name(serial->type->driver.owner));
564 seq_printf(m, " name:\"%s\"",
565 serial->type->description);
566 seq_printf(m, " vendor:%04x product:%04x",
567 le16_to_cpu(serial->dev->descriptor.idVendor),
568 le16_to_cpu(serial->dev->descriptor.idProduct));
569 seq_printf(m, " num_ports:%d", serial->num_ports);
570 seq_printf(m, " port:%d", port->port_number);
571 usb_make_path(serial->dev, tmp, sizeof(tmp));
572 seq_printf(m, " path:%s", tmp);
573
574 seq_putc(m, '\n');
575 usb_serial_put(serial);
576 mutex_unlock(&serial->disc_mutex);
577 }
578 return 0;
579}
580
581static int serial_tiocmget(struct tty_struct *tty)
582{
583 struct usb_serial_port *port = tty->driver_data;
584
585 dev_dbg(&port->dev, "%s\n", __func__);
586
587 if (port->serial->type->tiocmget)
588 return port->serial->type->tiocmget(tty);
589 return -ENOTTY;
590}
591
592static int serial_tiocmset(struct tty_struct *tty,
593 unsigned int set, unsigned int clear)
594{
595 struct usb_serial_port *port = tty->driver_data;
596
597 dev_dbg(&port->dev, "%s\n", __func__);
598
599 if (port->serial->type->tiocmset)
600 return port->serial->type->tiocmset(tty, set, clear);
601 return -ENOTTY;
602}
603
604static int serial_get_icount(struct tty_struct *tty,
605 struct serial_icounter_struct *icount)
606{
607 struct usb_serial_port *port = tty->driver_data;
608
609 dev_dbg(&port->dev, "%s\n", __func__);
610
611 if (port->serial->type->get_icount)
612 return port->serial->type->get_icount(tty, icount);
613 return -ENOTTY;
614}
615
616/*
617 * We would be calling tty_wakeup here, but unfortunately some line
618 * disciplines have an annoying habit of calling tty->write from
619 * the write wakeup callback (e.g. n_hdlc.c).
620 */
621void usb_serial_port_softint(struct usb_serial_port *port)
622{
623 schedule_work(&port->work);
624}
625EXPORT_SYMBOL_GPL(usb_serial_port_softint);
626
627static void usb_serial_port_work(struct work_struct *work)
628{
629 struct usb_serial_port *port =
630 container_of(work, struct usb_serial_port, work);
631
632 tty_port_tty_wakeup(&port->port);
633}
634
635static void usb_serial_port_poison_urbs(struct usb_serial_port *port)
636{
637 int i;
638
639 for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i)
640 usb_poison_urb(port->read_urbs[i]);
641 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)
642 usb_poison_urb(port->write_urbs[i]);
643
644 usb_poison_urb(port->interrupt_in_urb);
645 usb_poison_urb(port->interrupt_out_urb);
646}
647
648static void usb_serial_port_unpoison_urbs(struct usb_serial_port *port)
649{
650 int i;
651
652 for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i)
653 usb_unpoison_urb(port->read_urbs[i]);
654 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)
655 usb_unpoison_urb(port->write_urbs[i]);
656
657 usb_unpoison_urb(port->interrupt_in_urb);
658 usb_unpoison_urb(port->interrupt_out_urb);
659}
660
661static void usb_serial_port_release(struct device *dev)
662{
663 struct usb_serial_port *port = to_usb_serial_port(dev);
664 int i;
665
666 dev_dbg(dev, "%s\n", __func__);
667
668 usb_free_urb(port->interrupt_in_urb);
669 usb_free_urb(port->interrupt_out_urb);
670 for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) {
671 usb_free_urb(port->read_urbs[i]);
672 kfree(port->bulk_in_buffers[i]);
673 }
674 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) {
675 usb_free_urb(port->write_urbs[i]);
676 kfree(port->bulk_out_buffers[i]);
677 }
678 kfifo_free(&port->write_fifo);
679 kfree(port->interrupt_in_buffer);
680 kfree(port->interrupt_out_buffer);
681 tty_port_destroy(&port->port);
682 kfree(port);
683}
684
685static struct usb_serial *create_serial(struct usb_device *dev,
686 struct usb_interface *interface,
687 struct usb_serial_driver *driver)
688{
689 struct usb_serial *serial;
690
691 serial = kzalloc(sizeof(*serial), GFP_KERNEL);
692 if (!serial)
693 return NULL;
694 serial->dev = usb_get_dev(dev);
695 serial->type = driver;
696 serial->interface = usb_get_intf(interface);
697 kref_init(&serial->kref);
698 mutex_init(&serial->disc_mutex);
699 serial->minors_reserved = 0;
700
701 return serial;
702}
703
704static const struct usb_device_id *match_dynamic_id(struct usb_interface *intf,
705 struct usb_serial_driver *drv)
706{
707 struct usb_dynid *dynid;
708
709 spin_lock(&drv->dynids.lock);
710 list_for_each_entry(dynid, &drv->dynids.list, node) {
711 if (usb_match_one_id(intf, &dynid->id)) {
712 spin_unlock(&drv->dynids.lock);
713 return &dynid->id;
714 }
715 }
716 spin_unlock(&drv->dynids.lock);
717 return NULL;
718}
719
720static const struct usb_device_id *get_iface_id(struct usb_serial_driver *drv,
721 struct usb_interface *intf)
722{
723 const struct usb_device_id *id;
724
725 id = usb_match_id(intf, drv->id_table);
726 if (id) {
727 dev_dbg(&intf->dev, "static descriptor matches\n");
728 goto exit;
729 }
730 id = match_dynamic_id(intf, drv);
731 if (id)
732 dev_dbg(&intf->dev, "dynamic descriptor matches\n");
733exit:
734 return id;
735}
736
737/* Caller must hold table_lock */
738static struct usb_serial_driver *search_serial_device(
739 struct usb_interface *iface)
740{
741 const struct usb_device_id *id = NULL;
742 struct usb_serial_driver *drv;
743 struct usb_driver *driver = to_usb_driver(iface->dev.driver);
744
745 /* Check if the usb id matches a known device */
746 list_for_each_entry(drv, &usb_serial_driver_list, driver_list) {
747 if (drv->usb_driver == driver)
748 id = get_iface_id(drv, iface);
749 if (id)
750 return drv;
751 }
752
753 return NULL;
754}
755
756static bool serial_port_carrier_raised(struct tty_port *port)
757{
758 struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
759 struct usb_serial_driver *drv = p->serial->type;
760
761 if (drv->carrier_raised)
762 return drv->carrier_raised(p);
763 /* No carrier control - don't block */
764 return true;
765}
766
767static void serial_port_dtr_rts(struct tty_port *port, bool on)
768{
769 struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
770 struct usb_serial_driver *drv = p->serial->type;
771
772 if (drv->dtr_rts)
773 drv->dtr_rts(p, on);
774}
775
776static ssize_t port_number_show(struct device *dev,
777 struct device_attribute *attr, char *buf)
778{
779 struct usb_serial_port *port = to_usb_serial_port(dev);
780
781 return sprintf(buf, "%u\n", port->port_number);
782}
783static DEVICE_ATTR_RO(port_number);
784
785static struct attribute *usb_serial_port_attrs[] = {
786 &dev_attr_port_number.attr,
787 NULL
788};
789ATTRIBUTE_GROUPS(usb_serial_port);
790
791static const struct tty_port_operations serial_port_ops = {
792 .carrier_raised = serial_port_carrier_raised,
793 .dtr_rts = serial_port_dtr_rts,
794 .activate = serial_port_activate,
795 .shutdown = serial_port_shutdown,
796};
797
798static void store_endpoint(struct usb_serial *serial,
799 struct usb_serial_endpoints *epds,
800 struct usb_endpoint_descriptor *epd)
801{
802 struct device *dev = &serial->interface->dev;
803 u8 addr = epd->bEndpointAddress;
804
805 if (usb_endpoint_is_bulk_in(epd)) {
806 if (epds->num_bulk_in == ARRAY_SIZE(epds->bulk_in))
807 return;
808 dev_dbg(dev, "found bulk in endpoint %02x\n", addr);
809 epds->bulk_in[epds->num_bulk_in++] = epd;
810 } else if (usb_endpoint_is_bulk_out(epd)) {
811 if (epds->num_bulk_out == ARRAY_SIZE(epds->bulk_out))
812 return;
813 dev_dbg(dev, "found bulk out endpoint %02x\n", addr);
814 epds->bulk_out[epds->num_bulk_out++] = epd;
815 } else if (usb_endpoint_is_int_in(epd)) {
816 if (epds->num_interrupt_in == ARRAY_SIZE(epds->interrupt_in))
817 return;
818 dev_dbg(dev, "found interrupt in endpoint %02x\n", addr);
819 epds->interrupt_in[epds->num_interrupt_in++] = epd;
820 } else if (usb_endpoint_is_int_out(epd)) {
821 if (epds->num_interrupt_out == ARRAY_SIZE(epds->interrupt_out))
822 return;
823 dev_dbg(dev, "found interrupt out endpoint %02x\n", addr);
824 epds->interrupt_out[epds->num_interrupt_out++] = epd;
825 }
826}
827
828static void find_endpoints(struct usb_serial *serial,
829 struct usb_serial_endpoints *epds,
830 struct usb_interface *intf)
831{
832 struct usb_host_interface *iface_desc;
833 struct usb_endpoint_descriptor *epd;
834 unsigned int i;
835
836 iface_desc = intf->cur_altsetting;
837 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
838 epd = &iface_desc->endpoint[i].desc;
839 store_endpoint(serial, epds, epd);
840 }
841}
842
843static int setup_port_bulk_in(struct usb_serial_port *port,
844 struct usb_endpoint_descriptor *epd)
845{
846 struct usb_serial_driver *type = port->serial->type;
847 struct usb_device *udev = port->serial->dev;
848 int buffer_size;
849 int i;
850
851 buffer_size = max_t(int, type->bulk_in_size, usb_endpoint_maxp(epd));
852 port->bulk_in_size = buffer_size;
853 port->bulk_in_endpointAddress = epd->bEndpointAddress;
854
855 for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) {
856 set_bit(i, &port->read_urbs_free);
857 port->read_urbs[i] = usb_alloc_urb(0, GFP_KERNEL);
858 if (!port->read_urbs[i])
859 return -ENOMEM;
860 port->bulk_in_buffers[i] = kmalloc(buffer_size, GFP_KERNEL);
861 if (!port->bulk_in_buffers[i])
862 return -ENOMEM;
863 usb_fill_bulk_urb(port->read_urbs[i], udev,
864 usb_rcvbulkpipe(udev, epd->bEndpointAddress),
865 port->bulk_in_buffers[i], buffer_size,
866 type->read_bulk_callback, port);
867 }
868
869 port->read_urb = port->read_urbs[0];
870 port->bulk_in_buffer = port->bulk_in_buffers[0];
871
872 return 0;
873}
874
875static int setup_port_bulk_out(struct usb_serial_port *port,
876 struct usb_endpoint_descriptor *epd)
877{
878 struct usb_serial_driver *type = port->serial->type;
879 struct usb_device *udev = port->serial->dev;
880 int buffer_size;
881 int i;
882
883 if (kfifo_alloc(&port->write_fifo, PAGE_SIZE, GFP_KERNEL))
884 return -ENOMEM;
885 if (type->bulk_out_size)
886 buffer_size = type->bulk_out_size;
887 else
888 buffer_size = usb_endpoint_maxp(epd);
889 port->bulk_out_size = buffer_size;
890 port->bulk_out_endpointAddress = epd->bEndpointAddress;
891
892 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) {
893 set_bit(i, &port->write_urbs_free);
894 port->write_urbs[i] = usb_alloc_urb(0, GFP_KERNEL);
895 if (!port->write_urbs[i])
896 return -ENOMEM;
897 port->bulk_out_buffers[i] = kmalloc(buffer_size, GFP_KERNEL);
898 if (!port->bulk_out_buffers[i])
899 return -ENOMEM;
900 usb_fill_bulk_urb(port->write_urbs[i], udev,
901 usb_sndbulkpipe(udev, epd->bEndpointAddress),
902 port->bulk_out_buffers[i], buffer_size,
903 type->write_bulk_callback, port);
904 }
905
906 port->write_urb = port->write_urbs[0];
907 port->bulk_out_buffer = port->bulk_out_buffers[0];
908
909 return 0;
910}
911
912static int setup_port_interrupt_in(struct usb_serial_port *port,
913 struct usb_endpoint_descriptor *epd)
914{
915 struct usb_serial_driver *type = port->serial->type;
916 struct usb_device *udev = port->serial->dev;
917 int buffer_size;
918
919 port->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
920 if (!port->interrupt_in_urb)
921 return -ENOMEM;
922 buffer_size = usb_endpoint_maxp(epd);
923 port->interrupt_in_endpointAddress = epd->bEndpointAddress;
924 port->interrupt_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
925 if (!port->interrupt_in_buffer)
926 return -ENOMEM;
927 usb_fill_int_urb(port->interrupt_in_urb, udev,
928 usb_rcvintpipe(udev, epd->bEndpointAddress),
929 port->interrupt_in_buffer, buffer_size,
930 type->read_int_callback, port,
931 epd->bInterval);
932
933 return 0;
934}
935
936static int setup_port_interrupt_out(struct usb_serial_port *port,
937 struct usb_endpoint_descriptor *epd)
938{
939 struct usb_serial_driver *type = port->serial->type;
940 struct usb_device *udev = port->serial->dev;
941 int buffer_size;
942
943 port->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
944 if (!port->interrupt_out_urb)
945 return -ENOMEM;
946 buffer_size = usb_endpoint_maxp(epd);
947 port->interrupt_out_size = buffer_size;
948 port->interrupt_out_endpointAddress = epd->bEndpointAddress;
949 port->interrupt_out_buffer = kmalloc(buffer_size, GFP_KERNEL);
950 if (!port->interrupt_out_buffer)
951 return -ENOMEM;
952 usb_fill_int_urb(port->interrupt_out_urb, udev,
953 usb_sndintpipe(udev, epd->bEndpointAddress),
954 port->interrupt_out_buffer, buffer_size,
955 type->write_int_callback, port,
956 epd->bInterval);
957
958 return 0;
959}
960
961static int usb_serial_probe(struct usb_interface *interface,
962 const struct usb_device_id *id)
963{
964 struct device *ddev = &interface->dev;
965 struct usb_device *dev = interface_to_usbdev(interface);
966 struct usb_serial *serial = NULL;
967 struct usb_serial_port *port;
968 struct usb_serial_endpoints *epds;
969 struct usb_serial_driver *type = NULL;
970 int retval;
971 int i;
972 int num_ports = 0;
973 unsigned char max_endpoints;
974
975 mutex_lock(&table_lock);
976 type = search_serial_device(interface);
977 if (!type) {
978 mutex_unlock(&table_lock);
979 dev_dbg(ddev, "none matched\n");
980 return -ENODEV;
981 }
982
983 if (!try_module_get(type->driver.owner)) {
984 mutex_unlock(&table_lock);
985 dev_err(ddev, "module get failed, exiting\n");
986 return -EIO;
987 }
988 mutex_unlock(&table_lock);
989
990 serial = create_serial(dev, interface, type);
991 if (!serial) {
992 retval = -ENOMEM;
993 goto err_put_module;
994 }
995
996 /* if this device type has a probe function, call it */
997 if (type->probe) {
998 const struct usb_device_id *id;
999
1000 id = get_iface_id(type, interface);
1001 retval = type->probe(serial, id);
1002
1003 if (retval) {
1004 dev_dbg(ddev, "sub driver rejected device\n");
1005 goto err_release_sibling;
1006 }
1007 }
1008
1009 /* descriptor matches, let's find the endpoints needed */
1010 epds = kzalloc(sizeof(*epds), GFP_KERNEL);
1011 if (!epds) {
1012 retval = -ENOMEM;
1013 goto err_release_sibling;
1014 }
1015
1016 find_endpoints(serial, epds, interface);
1017 if (serial->sibling)
1018 find_endpoints(serial, epds, serial->sibling);
1019
1020 if (epds->num_bulk_in < type->num_bulk_in ||
1021 epds->num_bulk_out < type->num_bulk_out ||
1022 epds->num_interrupt_in < type->num_interrupt_in ||
1023 epds->num_interrupt_out < type->num_interrupt_out) {
1024 dev_err(ddev, "required endpoints missing\n");
1025 retval = -ENODEV;
1026 goto err_free_epds;
1027 }
1028
1029 if (type->calc_num_ports) {
1030 retval = type->calc_num_ports(serial, epds);
1031 if (retval < 0)
1032 goto err_free_epds;
1033 num_ports = retval;
1034 }
1035
1036 if (!num_ports)
1037 num_ports = type->num_ports;
1038
1039 if (num_ports > MAX_NUM_PORTS) {
1040 dev_warn(ddev, "too many ports requested: %d\n", num_ports);
1041 num_ports = MAX_NUM_PORTS;
1042 }
1043
1044 serial->num_ports = (unsigned char)num_ports;
1045 serial->num_bulk_in = epds->num_bulk_in;
1046 serial->num_bulk_out = epds->num_bulk_out;
1047 serial->num_interrupt_in = epds->num_interrupt_in;
1048 serial->num_interrupt_out = epds->num_interrupt_out;
1049
1050 /* found all that we need */
1051 dev_info(ddev, "%s converter detected\n", type->description);
1052
1053 /* create our ports, we need as many as the max endpoints */
1054 /* we don't use num_ports here because some devices have more
1055 endpoint pairs than ports */
1056 max_endpoints = max(epds->num_bulk_in, epds->num_bulk_out);
1057 max_endpoints = max(max_endpoints, epds->num_interrupt_in);
1058 max_endpoints = max(max_endpoints, epds->num_interrupt_out);
1059 max_endpoints = max(max_endpoints, serial->num_ports);
1060 serial->num_port_pointers = max_endpoints;
1061
1062 dev_dbg(ddev, "setting up %d port structure(s)\n", max_endpoints);
1063 for (i = 0; i < max_endpoints; ++i) {
1064 port = kzalloc(sizeof(struct usb_serial_port), GFP_KERNEL);
1065 if (!port) {
1066 retval = -ENOMEM;
1067 goto err_free_epds;
1068 }
1069 tty_port_init(&port->port);
1070 port->port.ops = &serial_port_ops;
1071 port->serial = serial;
1072 spin_lock_init(&port->lock);
1073 /* Keep this for private driver use for the moment but
1074 should probably go away */
1075 INIT_WORK(&port->work, usb_serial_port_work);
1076 serial->port[i] = port;
1077 port->dev.parent = &interface->dev;
1078 port->dev.driver = NULL;
1079 port->dev.bus = &usb_serial_bus_type;
1080 port->dev.release = &usb_serial_port_release;
1081 port->dev.groups = usb_serial_port_groups;
1082 device_initialize(&port->dev);
1083 }
1084
1085 /* set up the endpoint information */
1086 for (i = 0; i < epds->num_bulk_in; ++i) {
1087 retval = setup_port_bulk_in(serial->port[i], epds->bulk_in[i]);
1088 if (retval)
1089 goto err_free_epds;
1090 }
1091
1092 for (i = 0; i < epds->num_bulk_out; ++i) {
1093 retval = setup_port_bulk_out(serial->port[i],
1094 epds->bulk_out[i]);
1095 if (retval)
1096 goto err_free_epds;
1097 }
1098
1099 if (serial->type->read_int_callback) {
1100 for (i = 0; i < epds->num_interrupt_in; ++i) {
1101 retval = setup_port_interrupt_in(serial->port[i],
1102 epds->interrupt_in[i]);
1103 if (retval)
1104 goto err_free_epds;
1105 }
1106 } else if (epds->num_interrupt_in) {
1107 dev_dbg(ddev, "The device claims to support interrupt in transfers, but read_int_callback is not defined\n");
1108 }
1109
1110 if (serial->type->write_int_callback) {
1111 for (i = 0; i < epds->num_interrupt_out; ++i) {
1112 retval = setup_port_interrupt_out(serial->port[i],
1113 epds->interrupt_out[i]);
1114 if (retval)
1115 goto err_free_epds;
1116 }
1117 } else if (epds->num_interrupt_out) {
1118 dev_dbg(ddev, "The device claims to support interrupt out transfers, but write_int_callback is not defined\n");
1119 }
1120
1121 usb_set_intfdata(interface, serial);
1122
1123 /* if this device type has an attach function, call it */
1124 if (type->attach) {
1125 retval = type->attach(serial);
1126 if (retval < 0)
1127 goto err_free_epds;
1128 serial->attached = 1;
1129 if (retval > 0) {
1130 /* quietly accept this device, but don't bind to a
1131 serial port as it's about to disappear */
1132 serial->num_ports = 0;
1133 goto exit;
1134 }
1135 } else {
1136 serial->attached = 1;
1137 }
1138
1139 retval = allocate_minors(serial, num_ports);
1140 if (retval) {
1141 dev_err(ddev, "No more free serial minor numbers\n");
1142 goto err_free_epds;
1143 }
1144
1145 /* register all of the individual ports with the driver core */
1146 for (i = 0; i < num_ports; ++i) {
1147 port = serial->port[i];
1148 dev_set_name(&port->dev, "ttyUSB%d", port->minor);
1149 dev_dbg(ddev, "registering %s\n", dev_name(&port->dev));
1150 device_enable_async_suspend(&port->dev);
1151
1152 retval = device_add(&port->dev);
1153 if (retval)
1154 dev_err(ddev, "Error registering port device, continuing\n");
1155 }
1156
1157 if (num_ports > 0)
1158 usb_serial_console_init(serial->port[0]->minor);
1159exit:
1160 kfree(epds);
1161 module_put(type->driver.owner);
1162 return 0;
1163
1164err_free_epds:
1165 kfree(epds);
1166err_release_sibling:
1167 release_sibling(serial, interface);
1168 usb_serial_put(serial);
1169err_put_module:
1170 module_put(type->driver.owner);
1171
1172 return retval;
1173}
1174
1175static void usb_serial_disconnect(struct usb_interface *interface)
1176{
1177 int i;
1178 struct usb_serial *serial = usb_get_intfdata(interface);
1179 struct device *dev = &interface->dev;
1180 struct usb_serial_port *port;
1181 struct tty_struct *tty;
1182
1183 /* sibling interface is cleaning up */
1184 if (!serial)
1185 return;
1186
1187 usb_serial_console_disconnect(serial);
1188
1189 mutex_lock(&serial->disc_mutex);
1190 /* must set a flag, to signal subdrivers */
1191 serial->disconnected = 1;
1192 mutex_unlock(&serial->disc_mutex);
1193
1194 for (i = 0; i < serial->num_ports; ++i) {
1195 port = serial->port[i];
1196 tty = tty_port_tty_get(&port->port);
1197 if (tty) {
1198 tty_vhangup(tty);
1199 tty_kref_put(tty);
1200 }
1201 usb_serial_port_poison_urbs(port);
1202 wake_up_interruptible(&port->port.delta_msr_wait);
1203 cancel_work_sync(&port->work);
1204 if (device_is_registered(&port->dev))
1205 device_del(&port->dev);
1206 }
1207 if (serial->type->disconnect)
1208 serial->type->disconnect(serial);
1209
1210 release_sibling(serial, interface);
1211
1212 /* let the last holder of this object cause it to be cleaned up */
1213 usb_serial_put(serial);
1214 dev_info(dev, "device disconnected\n");
1215}
1216
1217int usb_serial_suspend(struct usb_interface *intf, pm_message_t message)
1218{
1219 struct usb_serial *serial = usb_get_intfdata(intf);
1220 int i, r;
1221
1222 /* suspend when called for first sibling interface */
1223 if (serial->suspend_count++)
1224 return 0;
1225
1226 /*
1227 * serial->type->suspend() MUST return 0 in system sleep context,
1228 * otherwise, the resume callback has to recover device from
1229 * previous suspend failure.
1230 */
1231 if (serial->type->suspend) {
1232 r = serial->type->suspend(serial, message);
1233 if (r < 0) {
1234 serial->suspend_count--;
1235 return r;
1236 }
1237 }
1238
1239 for (i = 0; i < serial->num_ports; ++i)
1240 usb_serial_port_poison_urbs(serial->port[i]);
1241
1242 return 0;
1243}
1244EXPORT_SYMBOL(usb_serial_suspend);
1245
1246static void usb_serial_unpoison_port_urbs(struct usb_serial *serial)
1247{
1248 int i;
1249
1250 for (i = 0; i < serial->num_ports; ++i)
1251 usb_serial_port_unpoison_urbs(serial->port[i]);
1252}
1253
1254int usb_serial_resume(struct usb_interface *intf)
1255{
1256 struct usb_serial *serial = usb_get_intfdata(intf);
1257 int rv;
1258
1259 /* resume when called for last sibling interface */
1260 if (--serial->suspend_count)
1261 return 0;
1262
1263 usb_serial_unpoison_port_urbs(serial);
1264
1265 if (serial->type->resume)
1266 rv = serial->type->resume(serial);
1267 else
1268 rv = usb_serial_generic_resume(serial);
1269
1270 return rv;
1271}
1272EXPORT_SYMBOL(usb_serial_resume);
1273
1274static int usb_serial_reset_resume(struct usb_interface *intf)
1275{
1276 struct usb_serial *serial = usb_get_intfdata(intf);
1277 int rv;
1278
1279 /* resume when called for last sibling interface */
1280 if (--serial->suspend_count)
1281 return 0;
1282
1283 usb_serial_unpoison_port_urbs(serial);
1284
1285 if (serial->type->reset_resume) {
1286 rv = serial->type->reset_resume(serial);
1287 } else {
1288 rv = -EOPNOTSUPP;
1289 intf->needs_binding = 1;
1290 }
1291
1292 return rv;
1293}
1294
1295static const struct tty_operations serial_ops = {
1296 .open = serial_open,
1297 .close = serial_close,
1298 .write = serial_write,
1299 .hangup = serial_hangup,
1300 .write_room = serial_write_room,
1301 .ioctl = serial_ioctl,
1302 .set_termios = serial_set_termios,
1303 .throttle = serial_throttle,
1304 .unthrottle = serial_unthrottle,
1305 .break_ctl = serial_break,
1306 .chars_in_buffer = serial_chars_in_buffer,
1307 .wait_until_sent = serial_wait_until_sent,
1308 .tiocmget = serial_tiocmget,
1309 .tiocmset = serial_tiocmset,
1310 .get_icount = serial_get_icount,
1311 .set_serial = serial_set_serial,
1312 .get_serial = serial_get_serial,
1313 .cleanup = serial_cleanup,
1314 .install = serial_install,
1315 .proc_show = serial_proc_show,
1316};
1317
1318
1319struct tty_driver *usb_serial_tty_driver;
1320
1321static int __init usb_serial_init(void)
1322{
1323 int result;
1324
1325 usb_serial_tty_driver = tty_alloc_driver(USB_SERIAL_TTY_MINORS,
1326 TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV);
1327 if (IS_ERR(usb_serial_tty_driver))
1328 return PTR_ERR(usb_serial_tty_driver);
1329
1330 /* Initialize our global data */
1331 result = bus_register(&usb_serial_bus_type);
1332 if (result) {
1333 pr_err("%s - registering bus driver failed\n", __func__);
1334 goto err_put_driver;
1335 }
1336
1337 usb_serial_tty_driver->driver_name = "usbserial";
1338 usb_serial_tty_driver->name = "ttyUSB";
1339 usb_serial_tty_driver->major = USB_SERIAL_TTY_MAJOR;
1340 usb_serial_tty_driver->minor_start = 0;
1341 usb_serial_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1342 usb_serial_tty_driver->subtype = SERIAL_TYPE_NORMAL;
1343 usb_serial_tty_driver->init_termios = tty_std_termios;
1344 usb_serial_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD
1345 | HUPCL | CLOCAL;
1346 usb_serial_tty_driver->init_termios.c_ispeed = 9600;
1347 usb_serial_tty_driver->init_termios.c_ospeed = 9600;
1348 tty_set_operations(usb_serial_tty_driver, &serial_ops);
1349 result = tty_register_driver(usb_serial_tty_driver);
1350 if (result) {
1351 pr_err("%s - tty_register_driver failed\n", __func__);
1352 goto err_unregister_bus;
1353 }
1354
1355 /* register the generic driver, if we should */
1356 result = usb_serial_generic_register();
1357 if (result < 0) {
1358 pr_err("%s - registering generic driver failed\n", __func__);
1359 goto err_unregister_driver;
1360 }
1361
1362 return result;
1363
1364err_unregister_driver:
1365 tty_unregister_driver(usb_serial_tty_driver);
1366err_unregister_bus:
1367 bus_unregister(&usb_serial_bus_type);
1368err_put_driver:
1369 pr_err("%s - returning with error %d\n", __func__, result);
1370 tty_driver_kref_put(usb_serial_tty_driver);
1371 return result;
1372}
1373
1374
1375static void __exit usb_serial_exit(void)
1376{
1377 usb_serial_console_exit();
1378
1379 usb_serial_generic_deregister();
1380
1381 tty_unregister_driver(usb_serial_tty_driver);
1382 tty_driver_kref_put(usb_serial_tty_driver);
1383 bus_unregister(&usb_serial_bus_type);
1384 idr_destroy(&serial_minors);
1385}
1386
1387
1388module_init(usb_serial_init);
1389module_exit(usb_serial_exit);
1390
1391#define set_to_generic_if_null(type, function) \
1392 do { \
1393 if (!type->function) { \
1394 type->function = usb_serial_generic_##function; \
1395 pr_debug("%s: using generic " #function "\n", \
1396 type->driver.name); \
1397 } \
1398 } while (0)
1399
1400static void usb_serial_operations_init(struct usb_serial_driver *device)
1401{
1402 set_to_generic_if_null(device, open);
1403 set_to_generic_if_null(device, write);
1404 set_to_generic_if_null(device, close);
1405 set_to_generic_if_null(device, write_room);
1406 set_to_generic_if_null(device, chars_in_buffer);
1407 if (device->tx_empty)
1408 set_to_generic_if_null(device, wait_until_sent);
1409 set_to_generic_if_null(device, read_bulk_callback);
1410 set_to_generic_if_null(device, write_bulk_callback);
1411 set_to_generic_if_null(device, process_read_urb);
1412 set_to_generic_if_null(device, prepare_write_buffer);
1413}
1414
1415static int usb_serial_register(struct usb_serial_driver *driver)
1416{
1417 int retval;
1418
1419 if (usb_disabled())
1420 return -ENODEV;
1421
1422 if (!driver->description)
1423 driver->description = driver->driver.name;
1424 if (!driver->usb_driver) {
1425 WARN(1, "Serial driver %s has no usb_driver\n",
1426 driver->description);
1427 return -EINVAL;
1428 }
1429
1430 /* Prevent individual ports from being unbound. */
1431 driver->driver.suppress_bind_attrs = true;
1432
1433 usb_serial_operations_init(driver);
1434
1435 /* Add this device to our list of devices */
1436 mutex_lock(&table_lock);
1437 list_add(&driver->driver_list, &usb_serial_driver_list);
1438
1439 retval = usb_serial_bus_register(driver);
1440 if (retval) {
1441 pr_err("problem %d when registering driver %s\n", retval, driver->description);
1442 list_del(&driver->driver_list);
1443 } else {
1444 pr_info("USB Serial support registered for %s\n", driver->description);
1445 }
1446 mutex_unlock(&table_lock);
1447 return retval;
1448}
1449
1450static void usb_serial_deregister(struct usb_serial_driver *device)
1451{
1452 pr_info("USB Serial deregistering driver %s\n", device->description);
1453
1454 mutex_lock(&table_lock);
1455 list_del(&device->driver_list);
1456 mutex_unlock(&table_lock);
1457
1458 usb_serial_bus_deregister(device);
1459}
1460
1461/**
1462 * usb_serial_register_drivers - register drivers for a usb-serial module
1463 * @serial_drivers: NULL-terminated array of pointers to drivers to be registered
1464 * @name: name of the usb_driver for this set of @serial_drivers
1465 * @id_table: list of all devices this @serial_drivers set binds to
1466 *
1467 * Registers all the drivers in the @serial_drivers array, and dynamically
1468 * creates a struct usb_driver with the name @name and id_table of @id_table.
1469 */
1470int usb_serial_register_drivers(struct usb_serial_driver *const serial_drivers[],
1471 const char *name,
1472 const struct usb_device_id *id_table)
1473{
1474 int rc;
1475 struct usb_driver *udriver;
1476 struct usb_serial_driver * const *sd;
1477
1478 /*
1479 * udriver must be registered before any of the serial drivers,
1480 * because the store_new_id() routine for the serial drivers (in
1481 * bus.c) probes udriver.
1482 *
1483 * Performance hack: We don't want udriver to be probed until
1484 * the serial drivers are registered, because the probe would
1485 * simply fail for lack of a matching serial driver.
1486 * So we leave udriver's id_table set to NULL until we are all set.
1487 *
1488 * Suspend/resume support is implemented in the usb-serial core,
1489 * so fill in the PM-related fields in udriver.
1490 */
1491 udriver = kzalloc(sizeof(*udriver), GFP_KERNEL);
1492 if (!udriver)
1493 return -ENOMEM;
1494
1495 udriver->name = name;
1496 udriver->no_dynamic_id = 1;
1497 udriver->supports_autosuspend = 1;
1498 udriver->suspend = usb_serial_suspend;
1499 udriver->resume = usb_serial_resume;
1500 udriver->probe = usb_serial_probe;
1501 udriver->disconnect = usb_serial_disconnect;
1502
1503 /* we only set the reset_resume field if the serial_driver has one */
1504 for (sd = serial_drivers; *sd; ++sd) {
1505 if ((*sd)->reset_resume) {
1506 udriver->reset_resume = usb_serial_reset_resume;
1507 break;
1508 }
1509 }
1510
1511 rc = usb_register(udriver);
1512 if (rc)
1513 goto err_free_driver;
1514
1515 for (sd = serial_drivers; *sd; ++sd) {
1516 (*sd)->usb_driver = udriver;
1517 rc = usb_serial_register(*sd);
1518 if (rc)
1519 goto err_deregister_drivers;
1520 }
1521
1522 /* Now set udriver's id_table and look for matches */
1523 udriver->id_table = id_table;
1524 rc = driver_attach(&udriver->driver);
1525 return 0;
1526
1527err_deregister_drivers:
1528 while (sd-- > serial_drivers)
1529 usb_serial_deregister(*sd);
1530 usb_deregister(udriver);
1531err_free_driver:
1532 kfree(udriver);
1533 return rc;
1534}
1535EXPORT_SYMBOL_GPL(usb_serial_register_drivers);
1536
1537/**
1538 * usb_serial_deregister_drivers - deregister drivers for a usb-serial module
1539 * @serial_drivers: NULL-terminated array of pointers to drivers to be deregistered
1540 *
1541 * Deregisters all the drivers in the @serial_drivers array and deregisters and
1542 * frees the struct usb_driver that was created by the call to
1543 * usb_serial_register_drivers().
1544 */
1545void usb_serial_deregister_drivers(struct usb_serial_driver *const serial_drivers[])
1546{
1547 struct usb_driver *udriver = (*serial_drivers)->usb_driver;
1548
1549 for (; *serial_drivers; ++serial_drivers)
1550 usb_serial_deregister(*serial_drivers);
1551 usb_deregister(udriver);
1552 kfree(udriver);
1553}
1554EXPORT_SYMBOL_GPL(usb_serial_deregister_drivers);
1555
1556MODULE_AUTHOR(DRIVER_AUTHOR);
1557MODULE_DESCRIPTION(DRIVER_DESC);
1558MODULE_LICENSE("GPL v2");
1/*
2 * USB Serial Converter driver
3 *
4 * Copyright (C) 2009 - 2013 Johan Hovold (jhovold@gmail.com)
5 * Copyright (C) 1999 - 2012 Greg Kroah-Hartman (greg@kroah.com)
6 * Copyright (C) 2000 Peter Berger (pberger@brimson.com)
7 * Copyright (C) 2000 Al Borchers (borchers@steinerpoint.com)
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License version
11 * 2 as published by the Free Software Foundation.
12 *
13 * This driver was originally based on the ACM driver by Armin Fuerst (which was
14 * based on a driver by Brad Keryan)
15 *
16 * See Documentation/usb/usb-serial.txt for more information on using this
17 * driver
18 */
19
20#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21
22#include <linux/kernel.h>
23#include <linux/errno.h>
24#include <linux/init.h>
25#include <linux/slab.h>
26#include <linux/tty.h>
27#include <linux/tty_driver.h>
28#include <linux/tty_flip.h>
29#include <linux/module.h>
30#include <linux/moduleparam.h>
31#include <linux/seq_file.h>
32#include <linux/spinlock.h>
33#include <linux/mutex.h>
34#include <linux/list.h>
35#include <linux/uaccess.h>
36#include <linux/serial.h>
37#include <linux/usb.h>
38#include <linux/usb/serial.h>
39#include <linux/kfifo.h>
40#include <linux/idr.h>
41#include "pl2303.h"
42
43#define DRIVER_AUTHOR "Greg Kroah-Hartman <gregkh@linuxfoundation.org>"
44#define DRIVER_DESC "USB Serial Driver core"
45
46#define USB_SERIAL_TTY_MAJOR 188
47#define USB_SERIAL_TTY_MINORS 512 /* should be enough for a while */
48
49/* There is no MODULE_DEVICE_TABLE for usbserial.c. Instead
50 the MODULE_DEVICE_TABLE declarations in each serial driver
51 cause the "hotplug" program to pull in whatever module is necessary
52 via modprobe, and modprobe will load usbserial because the serial
53 drivers depend on it.
54*/
55
56static DEFINE_IDR(serial_minors);
57static DEFINE_MUTEX(table_lock);
58static LIST_HEAD(usb_serial_driver_list);
59
60/*
61 * Look up the serial port structure. If it is found and it hasn't been
62 * disconnected, return with the parent usb_serial structure's disc_mutex held
63 * and its refcount incremented. Otherwise return NULL.
64 */
65struct usb_serial_port *usb_serial_port_get_by_minor(unsigned minor)
66{
67 struct usb_serial *serial;
68 struct usb_serial_port *port;
69
70 mutex_lock(&table_lock);
71 port = idr_find(&serial_minors, minor);
72 if (!port)
73 goto exit;
74
75 serial = port->serial;
76 mutex_lock(&serial->disc_mutex);
77 if (serial->disconnected) {
78 mutex_unlock(&serial->disc_mutex);
79 port = NULL;
80 } else {
81 kref_get(&serial->kref);
82 }
83exit:
84 mutex_unlock(&table_lock);
85 return port;
86}
87
88static int allocate_minors(struct usb_serial *serial, int num_ports)
89{
90 struct usb_serial_port *port;
91 unsigned int i, j;
92 int minor;
93
94 dev_dbg(&serial->interface->dev, "%s %d\n", __func__, num_ports);
95
96 mutex_lock(&table_lock);
97 for (i = 0; i < num_ports; ++i) {
98 port = serial->port[i];
99 minor = idr_alloc(&serial_minors, port, 0, 0, GFP_KERNEL);
100 if (minor < 0)
101 goto error;
102 port->minor = minor;
103 port->port_number = i;
104 }
105 serial->minors_reserved = 1;
106 mutex_unlock(&table_lock);
107 return 0;
108error:
109 /* unwind the already allocated minors */
110 for (j = 0; j < i; ++j)
111 idr_remove(&serial_minors, serial->port[j]->minor);
112 mutex_unlock(&table_lock);
113 return minor;
114}
115
116static void release_minors(struct usb_serial *serial)
117{
118 int i;
119
120 mutex_lock(&table_lock);
121 for (i = 0; i < serial->num_ports; ++i)
122 idr_remove(&serial_minors, serial->port[i]->minor);
123 mutex_unlock(&table_lock);
124 serial->minors_reserved = 0;
125}
126
127static void destroy_serial(struct kref *kref)
128{
129 struct usb_serial *serial;
130 struct usb_serial_port *port;
131 int i;
132
133 serial = to_usb_serial(kref);
134
135 /* return the minor range that this device had */
136 if (serial->minors_reserved)
137 release_minors(serial);
138
139 if (serial->attached && serial->type->release)
140 serial->type->release(serial);
141
142 /* Now that nothing is using the ports, they can be freed */
143 for (i = 0; i < serial->num_port_pointers; ++i) {
144 port = serial->port[i];
145 if (port) {
146 port->serial = NULL;
147 put_device(&port->dev);
148 }
149 }
150
151 usb_put_intf(serial->interface);
152 usb_put_dev(serial->dev);
153 kfree(serial);
154}
155
156void usb_serial_put(struct usb_serial *serial)
157{
158 kref_put(&serial->kref, destroy_serial);
159}
160
161/*****************************************************************************
162 * Driver tty interface functions
163 *****************************************************************************/
164
165/**
166 * serial_install - install tty
167 * @driver: the driver (USB in our case)
168 * @tty: the tty being created
169 *
170 * Create the termios objects for this tty. We use the default
171 * USB serial settings but permit them to be overridden by
172 * serial->type->init_termios.
173 *
174 * This is the first place a new tty gets used. Hence this is where we
175 * acquire references to the usb_serial structure and the driver module,
176 * where we store a pointer to the port, and where we do an autoresume.
177 * All these actions are reversed in serial_cleanup().
178 */
179static int serial_install(struct tty_driver *driver, struct tty_struct *tty)
180{
181 int idx = tty->index;
182 struct usb_serial *serial;
183 struct usb_serial_port *port;
184 int retval = -ENODEV;
185
186 port = usb_serial_port_get_by_minor(idx);
187 if (!port)
188 return retval;
189
190 serial = port->serial;
191 if (!try_module_get(serial->type->driver.owner))
192 goto error_module_get;
193
194 retval = usb_autopm_get_interface(serial->interface);
195 if (retval)
196 goto error_get_interface;
197
198 retval = tty_port_install(&port->port, driver, tty);
199 if (retval)
200 goto error_init_termios;
201
202 mutex_unlock(&serial->disc_mutex);
203
204 /* allow the driver to update the settings */
205 if (serial->type->init_termios)
206 serial->type->init_termios(tty);
207
208 tty->driver_data = port;
209
210 return retval;
211
212 error_init_termios:
213 usb_autopm_put_interface(serial->interface);
214 error_get_interface:
215 module_put(serial->type->driver.owner);
216 error_module_get:
217 usb_serial_put(serial);
218 mutex_unlock(&serial->disc_mutex);
219 return retval;
220}
221
222static int serial_port_activate(struct tty_port *tport, struct tty_struct *tty)
223{
224 struct usb_serial_port *port =
225 container_of(tport, struct usb_serial_port, port);
226 struct usb_serial *serial = port->serial;
227 int retval;
228
229 mutex_lock(&serial->disc_mutex);
230 if (serial->disconnected)
231 retval = -ENODEV;
232 else
233 retval = port->serial->type->open(tty, port);
234 mutex_unlock(&serial->disc_mutex);
235
236 if (retval < 0)
237 retval = usb_translate_errors(retval);
238
239 return retval;
240}
241
242static int serial_open(struct tty_struct *tty, struct file *filp)
243{
244 struct usb_serial_port *port = tty->driver_data;
245
246 dev_dbg(tty->dev, "%s\n", __func__);
247
248 return tty_port_open(&port->port, tty, filp);
249}
250
251/**
252 * serial_port_shutdown - shut down hardware
253 * @tport: tty port to shut down
254 *
255 * Shut down a USB serial port. Serialized against activate by the
256 * tport mutex and kept to matching open/close pairs
257 * of calls by the ASYNCB_INITIALIZED flag.
258 *
259 * Not called if tty is console.
260 */
261static void serial_port_shutdown(struct tty_port *tport)
262{
263 struct usb_serial_port *port =
264 container_of(tport, struct usb_serial_port, port);
265 struct usb_serial_driver *drv = port->serial->type;
266
267 if (drv->close)
268 drv->close(port);
269}
270
271static void serial_hangup(struct tty_struct *tty)
272{
273 struct usb_serial_port *port = tty->driver_data;
274
275 dev_dbg(tty->dev, "%s\n", __func__);
276
277 tty_port_hangup(&port->port);
278}
279
280static void serial_close(struct tty_struct *tty, struct file *filp)
281{
282 struct usb_serial_port *port = tty->driver_data;
283
284 dev_dbg(tty->dev, "%s\n", __func__);
285
286 tty_port_close(&port->port, tty, filp);
287}
288
289/**
290 * serial_cleanup - free resources post close/hangup
291 * @port: port to free up
292 *
293 * Do the resource freeing and refcount dropping for the port.
294 * Avoid freeing the console.
295 *
296 * Called asynchronously after the last tty kref is dropped.
297 */
298static void serial_cleanup(struct tty_struct *tty)
299{
300 struct usb_serial_port *port = tty->driver_data;
301 struct usb_serial *serial;
302 struct module *owner;
303
304 dev_dbg(tty->dev, "%s\n", __func__);
305
306 /* The console is magical. Do not hang up the console hardware
307 * or there will be tears.
308 */
309 if (port->port.console)
310 return;
311
312 tty->driver_data = NULL;
313
314 serial = port->serial;
315 owner = serial->type->driver.owner;
316
317 mutex_lock(&serial->disc_mutex);
318 if (!serial->disconnected)
319 usb_autopm_put_interface(serial->interface);
320 mutex_unlock(&serial->disc_mutex);
321
322 usb_serial_put(serial);
323 module_put(owner);
324}
325
326static int serial_write(struct tty_struct *tty, const unsigned char *buf,
327 int count)
328{
329 struct usb_serial_port *port = tty->driver_data;
330 int retval = -ENODEV;
331
332 if (port->serial->dev->state == USB_STATE_NOTATTACHED)
333 goto exit;
334
335 dev_dbg(tty->dev, "%s - %d byte(s)\n", __func__, count);
336
337 retval = port->serial->type->write(tty, port, buf, count);
338 if (retval < 0)
339 retval = usb_translate_errors(retval);
340exit:
341 return retval;
342}
343
344static int serial_write_room(struct tty_struct *tty)
345{
346 struct usb_serial_port *port = tty->driver_data;
347
348 dev_dbg(tty->dev, "%s\n", __func__);
349
350 return port->serial->type->write_room(tty);
351}
352
353static int serial_chars_in_buffer(struct tty_struct *tty)
354{
355 struct usb_serial_port *port = tty->driver_data;
356 struct usb_serial *serial = port->serial;
357
358 dev_dbg(tty->dev, "%s\n", __func__);
359
360 if (serial->disconnected)
361 return 0;
362
363 return serial->type->chars_in_buffer(tty);
364}
365
366static void serial_wait_until_sent(struct tty_struct *tty, int timeout)
367{
368 struct usb_serial_port *port = tty->driver_data;
369 struct usb_serial *serial = port->serial;
370
371 dev_dbg(tty->dev, "%s\n", __func__);
372
373 if (!port->serial->type->wait_until_sent)
374 return;
375
376 mutex_lock(&serial->disc_mutex);
377 if (!serial->disconnected)
378 port->serial->type->wait_until_sent(tty, timeout);
379 mutex_unlock(&serial->disc_mutex);
380}
381
382static void serial_throttle(struct tty_struct *tty)
383{
384 struct usb_serial_port *port = tty->driver_data;
385
386 dev_dbg(tty->dev, "%s\n", __func__);
387
388 if (port->serial->type->throttle)
389 port->serial->type->throttle(tty);
390}
391
392static void serial_unthrottle(struct tty_struct *tty)
393{
394 struct usb_serial_port *port = tty->driver_data;
395
396 dev_dbg(tty->dev, "%s\n", __func__);
397
398 if (port->serial->type->unthrottle)
399 port->serial->type->unthrottle(tty);
400}
401
402static int serial_ioctl(struct tty_struct *tty,
403 unsigned int cmd, unsigned long arg)
404{
405 struct usb_serial_port *port = tty->driver_data;
406 int retval = -ENOIOCTLCMD;
407
408 dev_dbg(tty->dev, "%s - cmd 0x%04x\n", __func__, cmd);
409
410 switch (cmd) {
411 case TIOCMIWAIT:
412 if (port->serial->type->tiocmiwait)
413 retval = port->serial->type->tiocmiwait(tty, arg);
414 break;
415 default:
416 if (port->serial->type->ioctl)
417 retval = port->serial->type->ioctl(tty, cmd, arg);
418 }
419
420 return retval;
421}
422
423static void serial_set_termios(struct tty_struct *tty, struct ktermios *old)
424{
425 struct usb_serial_port *port = tty->driver_data;
426
427 dev_dbg(tty->dev, "%s\n", __func__);
428
429 if (port->serial->type->set_termios)
430 port->serial->type->set_termios(tty, port, old);
431 else
432 tty_termios_copy_hw(&tty->termios, old);
433}
434
435static int serial_break(struct tty_struct *tty, int break_state)
436{
437 struct usb_serial_port *port = tty->driver_data;
438
439 dev_dbg(tty->dev, "%s\n", __func__);
440
441 if (port->serial->type->break_ctl)
442 port->serial->type->break_ctl(tty, break_state);
443
444 return 0;
445}
446
447static int serial_proc_show(struct seq_file *m, void *v)
448{
449 struct usb_serial *serial;
450 struct usb_serial_port *port;
451 int i;
452 char tmp[40];
453
454 seq_puts(m, "usbserinfo:1.0 driver:2.0\n");
455 for (i = 0; i < USB_SERIAL_TTY_MINORS; ++i) {
456 port = usb_serial_port_get_by_minor(i);
457 if (port == NULL)
458 continue;
459 serial = port->serial;
460
461 seq_printf(m, "%d:", i);
462 if (serial->type->driver.owner)
463 seq_printf(m, " module:%s",
464 module_name(serial->type->driver.owner));
465 seq_printf(m, " name:\"%s\"",
466 serial->type->description);
467 seq_printf(m, " vendor:%04x product:%04x",
468 le16_to_cpu(serial->dev->descriptor.idVendor),
469 le16_to_cpu(serial->dev->descriptor.idProduct));
470 seq_printf(m, " num_ports:%d", serial->num_ports);
471 seq_printf(m, " port:%d", port->port_number);
472 usb_make_path(serial->dev, tmp, sizeof(tmp));
473 seq_printf(m, " path:%s", tmp);
474
475 seq_putc(m, '\n');
476 usb_serial_put(serial);
477 mutex_unlock(&serial->disc_mutex);
478 }
479 return 0;
480}
481
482static int serial_proc_open(struct inode *inode, struct file *file)
483{
484 return single_open(file, serial_proc_show, NULL);
485}
486
487static const struct file_operations serial_proc_fops = {
488 .owner = THIS_MODULE,
489 .open = serial_proc_open,
490 .read = seq_read,
491 .llseek = seq_lseek,
492 .release = single_release,
493};
494
495static int serial_tiocmget(struct tty_struct *tty)
496{
497 struct usb_serial_port *port = tty->driver_data;
498
499 dev_dbg(tty->dev, "%s\n", __func__);
500
501 if (port->serial->type->tiocmget)
502 return port->serial->type->tiocmget(tty);
503 return -EINVAL;
504}
505
506static int serial_tiocmset(struct tty_struct *tty,
507 unsigned int set, unsigned int clear)
508{
509 struct usb_serial_port *port = tty->driver_data;
510
511 dev_dbg(tty->dev, "%s\n", __func__);
512
513 if (port->serial->type->tiocmset)
514 return port->serial->type->tiocmset(tty, set, clear);
515 return -EINVAL;
516}
517
518static int serial_get_icount(struct tty_struct *tty,
519 struct serial_icounter_struct *icount)
520{
521 struct usb_serial_port *port = tty->driver_data;
522
523 dev_dbg(tty->dev, "%s\n", __func__);
524
525 if (port->serial->type->get_icount)
526 return port->serial->type->get_icount(tty, icount);
527 return -EINVAL;
528}
529
530/*
531 * We would be calling tty_wakeup here, but unfortunately some line
532 * disciplines have an annoying habit of calling tty->write from
533 * the write wakeup callback (e.g. n_hdlc.c).
534 */
535void usb_serial_port_softint(struct usb_serial_port *port)
536{
537 schedule_work(&port->work);
538}
539EXPORT_SYMBOL_GPL(usb_serial_port_softint);
540
541static void usb_serial_port_work(struct work_struct *work)
542{
543 struct usb_serial_port *port =
544 container_of(work, struct usb_serial_port, work);
545
546 tty_port_tty_wakeup(&port->port);
547}
548
549static void usb_serial_port_poison_urbs(struct usb_serial_port *port)
550{
551 int i;
552
553 for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i)
554 usb_poison_urb(port->read_urbs[i]);
555 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)
556 usb_poison_urb(port->write_urbs[i]);
557
558 usb_poison_urb(port->interrupt_in_urb);
559 usb_poison_urb(port->interrupt_out_urb);
560}
561
562static void usb_serial_port_unpoison_urbs(struct usb_serial_port *port)
563{
564 int i;
565
566 for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i)
567 usb_unpoison_urb(port->read_urbs[i]);
568 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)
569 usb_unpoison_urb(port->write_urbs[i]);
570
571 usb_unpoison_urb(port->interrupt_in_urb);
572 usb_unpoison_urb(port->interrupt_out_urb);
573}
574
575static void usb_serial_port_release(struct device *dev)
576{
577 struct usb_serial_port *port = to_usb_serial_port(dev);
578 int i;
579
580 dev_dbg(dev, "%s\n", __func__);
581
582 usb_free_urb(port->interrupt_in_urb);
583 usb_free_urb(port->interrupt_out_urb);
584 for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) {
585 usb_free_urb(port->read_urbs[i]);
586 kfree(port->bulk_in_buffers[i]);
587 }
588 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) {
589 usb_free_urb(port->write_urbs[i]);
590 kfree(port->bulk_out_buffers[i]);
591 }
592 kfifo_free(&port->write_fifo);
593 kfree(port->interrupt_in_buffer);
594 kfree(port->interrupt_out_buffer);
595 tty_port_destroy(&port->port);
596 kfree(port);
597}
598
599static struct usb_serial *create_serial(struct usb_device *dev,
600 struct usb_interface *interface,
601 struct usb_serial_driver *driver)
602{
603 struct usb_serial *serial;
604
605 serial = kzalloc(sizeof(*serial), GFP_KERNEL);
606 if (!serial)
607 return NULL;
608 serial->dev = usb_get_dev(dev);
609 serial->type = driver;
610 serial->interface = usb_get_intf(interface);
611 kref_init(&serial->kref);
612 mutex_init(&serial->disc_mutex);
613 serial->minors_reserved = 0;
614
615 return serial;
616}
617
618static const struct usb_device_id *match_dynamic_id(struct usb_interface *intf,
619 struct usb_serial_driver *drv)
620{
621 struct usb_dynid *dynid;
622
623 spin_lock(&drv->dynids.lock);
624 list_for_each_entry(dynid, &drv->dynids.list, node) {
625 if (usb_match_one_id(intf, &dynid->id)) {
626 spin_unlock(&drv->dynids.lock);
627 return &dynid->id;
628 }
629 }
630 spin_unlock(&drv->dynids.lock);
631 return NULL;
632}
633
634static const struct usb_device_id *get_iface_id(struct usb_serial_driver *drv,
635 struct usb_interface *intf)
636{
637 const struct usb_device_id *id;
638
639 id = usb_match_id(intf, drv->id_table);
640 if (id) {
641 dev_dbg(&intf->dev, "static descriptor matches\n");
642 goto exit;
643 }
644 id = match_dynamic_id(intf, drv);
645 if (id)
646 dev_dbg(&intf->dev, "dynamic descriptor matches\n");
647exit:
648 return id;
649}
650
651/* Caller must hold table_lock */
652static struct usb_serial_driver *search_serial_device(
653 struct usb_interface *iface)
654{
655 const struct usb_device_id *id = NULL;
656 struct usb_serial_driver *drv;
657 struct usb_driver *driver = to_usb_driver(iface->dev.driver);
658
659 /* Check if the usb id matches a known device */
660 list_for_each_entry(drv, &usb_serial_driver_list, driver_list) {
661 if (drv->usb_driver == driver)
662 id = get_iface_id(drv, iface);
663 if (id)
664 return drv;
665 }
666
667 return NULL;
668}
669
670static int serial_port_carrier_raised(struct tty_port *port)
671{
672 struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
673 struct usb_serial_driver *drv = p->serial->type;
674
675 if (drv->carrier_raised)
676 return drv->carrier_raised(p);
677 /* No carrier control - don't block */
678 return 1;
679}
680
681static void serial_port_dtr_rts(struct tty_port *port, int on)
682{
683 struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
684 struct usb_serial_driver *drv = p->serial->type;
685
686 if (drv->dtr_rts)
687 drv->dtr_rts(p, on);
688}
689
690static const struct tty_port_operations serial_port_ops = {
691 .carrier_raised = serial_port_carrier_raised,
692 .dtr_rts = serial_port_dtr_rts,
693 .activate = serial_port_activate,
694 .shutdown = serial_port_shutdown,
695};
696
697static int usb_serial_probe(struct usb_interface *interface,
698 const struct usb_device_id *id)
699{
700 struct device *ddev = &interface->dev;
701 struct usb_device *dev = interface_to_usbdev(interface);
702 struct usb_serial *serial = NULL;
703 struct usb_serial_port *port;
704 struct usb_host_interface *iface_desc;
705 struct usb_endpoint_descriptor *endpoint;
706 struct usb_endpoint_descriptor *interrupt_in_endpoint[MAX_NUM_PORTS];
707 struct usb_endpoint_descriptor *interrupt_out_endpoint[MAX_NUM_PORTS];
708 struct usb_endpoint_descriptor *bulk_in_endpoint[MAX_NUM_PORTS];
709 struct usb_endpoint_descriptor *bulk_out_endpoint[MAX_NUM_PORTS];
710 struct usb_serial_driver *type = NULL;
711 int retval;
712 int buffer_size;
713 int i;
714 int j;
715 int num_interrupt_in = 0;
716 int num_interrupt_out = 0;
717 int num_bulk_in = 0;
718 int num_bulk_out = 0;
719 int num_ports = 0;
720 int max_endpoints;
721
722 mutex_lock(&table_lock);
723 type = search_serial_device(interface);
724 if (!type) {
725 mutex_unlock(&table_lock);
726 dev_dbg(ddev, "none matched\n");
727 return -ENODEV;
728 }
729
730 if (!try_module_get(type->driver.owner)) {
731 mutex_unlock(&table_lock);
732 dev_err(ddev, "module get failed, exiting\n");
733 return -EIO;
734 }
735 mutex_unlock(&table_lock);
736
737 serial = create_serial(dev, interface, type);
738 if (!serial) {
739 module_put(type->driver.owner);
740 return -ENOMEM;
741 }
742
743 /* if this device type has a probe function, call it */
744 if (type->probe) {
745 const struct usb_device_id *id;
746
747 id = get_iface_id(type, interface);
748 retval = type->probe(serial, id);
749
750 if (retval) {
751 dev_dbg(ddev, "sub driver rejected device\n");
752 usb_serial_put(serial);
753 module_put(type->driver.owner);
754 return retval;
755 }
756 }
757
758 /* descriptor matches, let's find the endpoints needed */
759 /* check out the endpoints */
760 iface_desc = interface->cur_altsetting;
761 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
762 endpoint = &iface_desc->endpoint[i].desc;
763
764 if (usb_endpoint_is_bulk_in(endpoint)) {
765 /* we found a bulk in endpoint */
766 dev_dbg(ddev, "found bulk in on endpoint %d\n", i);
767 bulk_in_endpoint[num_bulk_in] = endpoint;
768 ++num_bulk_in;
769 }
770
771 if (usb_endpoint_is_bulk_out(endpoint)) {
772 /* we found a bulk out endpoint */
773 dev_dbg(ddev, "found bulk out on endpoint %d\n", i);
774 bulk_out_endpoint[num_bulk_out] = endpoint;
775 ++num_bulk_out;
776 }
777
778 if (usb_endpoint_is_int_in(endpoint)) {
779 /* we found a interrupt in endpoint */
780 dev_dbg(ddev, "found interrupt in on endpoint %d\n", i);
781 interrupt_in_endpoint[num_interrupt_in] = endpoint;
782 ++num_interrupt_in;
783 }
784
785 if (usb_endpoint_is_int_out(endpoint)) {
786 /* we found an interrupt out endpoint */
787 dev_dbg(ddev, "found interrupt out on endpoint %d\n", i);
788 interrupt_out_endpoint[num_interrupt_out] = endpoint;
789 ++num_interrupt_out;
790 }
791 }
792
793#if defined(CONFIG_USB_SERIAL_PL2303) || defined(CONFIG_USB_SERIAL_PL2303_MODULE)
794 /* BEGIN HORRIBLE HACK FOR PL2303 */
795 /* this is needed due to the looney way its endpoints are set up */
796 if (((le16_to_cpu(dev->descriptor.idVendor) == PL2303_VENDOR_ID) &&
797 (le16_to_cpu(dev->descriptor.idProduct) == PL2303_PRODUCT_ID)) ||
798 ((le16_to_cpu(dev->descriptor.idVendor) == ATEN_VENDOR_ID) &&
799 (le16_to_cpu(dev->descriptor.idProduct) == ATEN_PRODUCT_ID)) ||
800 ((le16_to_cpu(dev->descriptor.idVendor) == ALCOR_VENDOR_ID) &&
801 (le16_to_cpu(dev->descriptor.idProduct) == ALCOR_PRODUCT_ID)) ||
802 ((le16_to_cpu(dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
803 (le16_to_cpu(dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_EF81))) {
804 if (interface != dev->actconfig->interface[0]) {
805 /* check out the endpoints of the other interface*/
806 iface_desc = dev->actconfig->interface[0]->cur_altsetting;
807 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
808 endpoint = &iface_desc->endpoint[i].desc;
809 if (usb_endpoint_is_int_in(endpoint)) {
810 /* we found a interrupt in endpoint */
811 dev_dbg(ddev, "found interrupt in for Prolific device on separate interface\n");
812 interrupt_in_endpoint[num_interrupt_in] = endpoint;
813 ++num_interrupt_in;
814 }
815 }
816 }
817
818 /* Now make sure the PL-2303 is configured correctly.
819 * If not, give up now and hope this hack will work
820 * properly during a later invocation of usb_serial_probe
821 */
822 if (num_bulk_in == 0 || num_bulk_out == 0) {
823 dev_info(ddev, "PL-2303 hack: descriptors matched but endpoints did not\n");
824 usb_serial_put(serial);
825 module_put(type->driver.owner);
826 return -ENODEV;
827 }
828 }
829 /* END HORRIBLE HACK FOR PL2303 */
830#endif
831
832#ifdef CONFIG_USB_SERIAL_GENERIC
833 if (type == &usb_serial_generic_device) {
834 num_ports = num_bulk_out;
835 if (num_ports == 0) {
836 dev_err(ddev, "Generic device with no bulk out, not allowed.\n");
837 usb_serial_put(serial);
838 module_put(type->driver.owner);
839 return -EIO;
840 }
841 dev_info(ddev, "The \"generic\" usb-serial driver is only for testing and one-off prototypes.\n");
842 dev_info(ddev, "Tell linux-usb@vger.kernel.org to add your device to a proper driver.\n");
843 }
844#endif
845 if (!num_ports) {
846 /* if this device type has a calc_num_ports function, call it */
847 if (type->calc_num_ports)
848 num_ports = type->calc_num_ports(serial);
849 if (!num_ports)
850 num_ports = type->num_ports;
851 }
852
853 serial->num_ports = num_ports;
854 serial->num_bulk_in = num_bulk_in;
855 serial->num_bulk_out = num_bulk_out;
856 serial->num_interrupt_in = num_interrupt_in;
857 serial->num_interrupt_out = num_interrupt_out;
858
859 /* found all that we need */
860 dev_info(ddev, "%s converter detected\n", type->description);
861
862 /* create our ports, we need as many as the max endpoints */
863 /* we don't use num_ports here because some devices have more
864 endpoint pairs than ports */
865 max_endpoints = max(num_bulk_in, num_bulk_out);
866 max_endpoints = max(max_endpoints, num_interrupt_in);
867 max_endpoints = max(max_endpoints, num_interrupt_out);
868 max_endpoints = max(max_endpoints, (int)serial->num_ports);
869 serial->num_port_pointers = max_endpoints;
870
871 dev_dbg(ddev, "setting up %d port structure(s)\n", max_endpoints);
872 for (i = 0; i < max_endpoints; ++i) {
873 port = kzalloc(sizeof(struct usb_serial_port), GFP_KERNEL);
874 if (!port)
875 goto probe_error;
876 tty_port_init(&port->port);
877 port->port.ops = &serial_port_ops;
878 port->serial = serial;
879 spin_lock_init(&port->lock);
880 /* Keep this for private driver use for the moment but
881 should probably go away */
882 INIT_WORK(&port->work, usb_serial_port_work);
883 serial->port[i] = port;
884 port->dev.parent = &interface->dev;
885 port->dev.driver = NULL;
886 port->dev.bus = &usb_serial_bus_type;
887 port->dev.release = &usb_serial_port_release;
888 device_initialize(&port->dev);
889 }
890
891 /* set up the endpoint information */
892 for (i = 0; i < num_bulk_in; ++i) {
893 endpoint = bulk_in_endpoint[i];
894 port = serial->port[i];
895 buffer_size = max_t(int, serial->type->bulk_in_size,
896 usb_endpoint_maxp(endpoint));
897 port->bulk_in_size = buffer_size;
898 port->bulk_in_endpointAddress = endpoint->bEndpointAddress;
899
900 for (j = 0; j < ARRAY_SIZE(port->read_urbs); ++j) {
901 set_bit(j, &port->read_urbs_free);
902 port->read_urbs[j] = usb_alloc_urb(0, GFP_KERNEL);
903 if (!port->read_urbs[j])
904 goto probe_error;
905 port->bulk_in_buffers[j] = kmalloc(buffer_size,
906 GFP_KERNEL);
907 if (!port->bulk_in_buffers[j])
908 goto probe_error;
909 usb_fill_bulk_urb(port->read_urbs[j], dev,
910 usb_rcvbulkpipe(dev,
911 endpoint->bEndpointAddress),
912 port->bulk_in_buffers[j], buffer_size,
913 serial->type->read_bulk_callback,
914 port);
915 }
916
917 port->read_urb = port->read_urbs[0];
918 port->bulk_in_buffer = port->bulk_in_buffers[0];
919 }
920
921 for (i = 0; i < num_bulk_out; ++i) {
922 endpoint = bulk_out_endpoint[i];
923 port = serial->port[i];
924 if (kfifo_alloc(&port->write_fifo, PAGE_SIZE, GFP_KERNEL))
925 goto probe_error;
926 buffer_size = max_t(int, serial->type->bulk_out_size,
927 usb_endpoint_maxp(endpoint));
928 port->bulk_out_size = buffer_size;
929 port->bulk_out_endpointAddress = endpoint->bEndpointAddress;
930
931 for (j = 0; j < ARRAY_SIZE(port->write_urbs); ++j) {
932 set_bit(j, &port->write_urbs_free);
933 port->write_urbs[j] = usb_alloc_urb(0, GFP_KERNEL);
934 if (!port->write_urbs[j])
935 goto probe_error;
936 port->bulk_out_buffers[j] = kmalloc(buffer_size,
937 GFP_KERNEL);
938 if (!port->bulk_out_buffers[j])
939 goto probe_error;
940 usb_fill_bulk_urb(port->write_urbs[j], dev,
941 usb_sndbulkpipe(dev,
942 endpoint->bEndpointAddress),
943 port->bulk_out_buffers[j], buffer_size,
944 serial->type->write_bulk_callback,
945 port);
946 }
947
948 port->write_urb = port->write_urbs[0];
949 port->bulk_out_buffer = port->bulk_out_buffers[0];
950 }
951
952 if (serial->type->read_int_callback) {
953 for (i = 0; i < num_interrupt_in; ++i) {
954 endpoint = interrupt_in_endpoint[i];
955 port = serial->port[i];
956 port->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
957 if (!port->interrupt_in_urb)
958 goto probe_error;
959 buffer_size = usb_endpoint_maxp(endpoint);
960 port->interrupt_in_endpointAddress =
961 endpoint->bEndpointAddress;
962 port->interrupt_in_buffer = kmalloc(buffer_size,
963 GFP_KERNEL);
964 if (!port->interrupt_in_buffer)
965 goto probe_error;
966 usb_fill_int_urb(port->interrupt_in_urb, dev,
967 usb_rcvintpipe(dev,
968 endpoint->bEndpointAddress),
969 port->interrupt_in_buffer, buffer_size,
970 serial->type->read_int_callback, port,
971 endpoint->bInterval);
972 }
973 } else if (num_interrupt_in) {
974 dev_dbg(ddev, "The device claims to support interrupt in transfers, but read_int_callback is not defined\n");
975 }
976
977 if (serial->type->write_int_callback) {
978 for (i = 0; i < num_interrupt_out; ++i) {
979 endpoint = interrupt_out_endpoint[i];
980 port = serial->port[i];
981 port->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
982 if (!port->interrupt_out_urb)
983 goto probe_error;
984 buffer_size = usb_endpoint_maxp(endpoint);
985 port->interrupt_out_size = buffer_size;
986 port->interrupt_out_endpointAddress =
987 endpoint->bEndpointAddress;
988 port->interrupt_out_buffer = kmalloc(buffer_size,
989 GFP_KERNEL);
990 if (!port->interrupt_out_buffer)
991 goto probe_error;
992 usb_fill_int_urb(port->interrupt_out_urb, dev,
993 usb_sndintpipe(dev,
994 endpoint->bEndpointAddress),
995 port->interrupt_out_buffer, buffer_size,
996 serial->type->write_int_callback, port,
997 endpoint->bInterval);
998 }
999 } else if (num_interrupt_out) {
1000 dev_dbg(ddev, "The device claims to support interrupt out transfers, but write_int_callback is not defined\n");
1001 }
1002
1003 usb_set_intfdata(interface, serial);
1004
1005 /* if this device type has an attach function, call it */
1006 if (type->attach) {
1007 retval = type->attach(serial);
1008 if (retval < 0)
1009 goto probe_error;
1010 serial->attached = 1;
1011 if (retval > 0) {
1012 /* quietly accept this device, but don't bind to a
1013 serial port as it's about to disappear */
1014 serial->num_ports = 0;
1015 goto exit;
1016 }
1017 } else {
1018 serial->attached = 1;
1019 }
1020
1021 /* Avoid race with tty_open and serial_install by setting the
1022 * disconnected flag and not clearing it until all ports have been
1023 * registered.
1024 */
1025 serial->disconnected = 1;
1026
1027 if (allocate_minors(serial, num_ports)) {
1028 dev_err(ddev, "No more free serial minor numbers\n");
1029 goto probe_error;
1030 }
1031
1032 /* register all of the individual ports with the driver core */
1033 for (i = 0; i < num_ports; ++i) {
1034 port = serial->port[i];
1035 dev_set_name(&port->dev, "ttyUSB%d", port->minor);
1036 dev_dbg(ddev, "registering %s\n", dev_name(&port->dev));
1037 device_enable_async_suspend(&port->dev);
1038
1039 retval = device_add(&port->dev);
1040 if (retval)
1041 dev_err(ddev, "Error registering port device, continuing\n");
1042 }
1043
1044 serial->disconnected = 0;
1045
1046 usb_serial_console_init(serial->port[0]->minor);
1047exit:
1048 module_put(type->driver.owner);
1049 return 0;
1050
1051probe_error:
1052 usb_serial_put(serial);
1053 module_put(type->driver.owner);
1054 return -EIO;
1055}
1056
1057static void usb_serial_disconnect(struct usb_interface *interface)
1058{
1059 int i;
1060 struct usb_serial *serial = usb_get_intfdata(interface);
1061 struct device *dev = &interface->dev;
1062 struct usb_serial_port *port;
1063
1064 usb_serial_console_disconnect(serial);
1065
1066 mutex_lock(&serial->disc_mutex);
1067 /* must set a flag, to signal subdrivers */
1068 serial->disconnected = 1;
1069 mutex_unlock(&serial->disc_mutex);
1070
1071 for (i = 0; i < serial->num_ports; ++i) {
1072 port = serial->port[i];
1073 if (port) {
1074 struct tty_struct *tty = tty_port_tty_get(&port->port);
1075 if (tty) {
1076 tty_vhangup(tty);
1077 tty_kref_put(tty);
1078 }
1079 usb_serial_port_poison_urbs(port);
1080 wake_up_interruptible(&port->port.delta_msr_wait);
1081 cancel_work_sync(&port->work);
1082 if (device_is_registered(&port->dev))
1083 device_del(&port->dev);
1084 }
1085 }
1086 if (serial->type->disconnect)
1087 serial->type->disconnect(serial);
1088
1089 /* let the last holder of this object cause it to be cleaned up */
1090 usb_serial_put(serial);
1091 dev_info(dev, "device disconnected\n");
1092}
1093
1094int usb_serial_suspend(struct usb_interface *intf, pm_message_t message)
1095{
1096 struct usb_serial *serial = usb_get_intfdata(intf);
1097 struct usb_serial_port *port;
1098 int i, r = 0;
1099
1100 serial->suspending = 1;
1101
1102 /*
1103 * serial->type->suspend() MUST return 0 in system sleep context,
1104 * otherwise, the resume callback has to recover device from
1105 * previous suspend failure.
1106 */
1107 if (serial->type->suspend) {
1108 r = serial->type->suspend(serial, message);
1109 if (r < 0) {
1110 serial->suspending = 0;
1111 goto err_out;
1112 }
1113 }
1114
1115 for (i = 0; i < serial->num_ports; ++i) {
1116 port = serial->port[i];
1117 if (port)
1118 usb_serial_port_poison_urbs(port);
1119 }
1120
1121err_out:
1122 return r;
1123}
1124EXPORT_SYMBOL(usb_serial_suspend);
1125
1126static void usb_serial_unpoison_port_urbs(struct usb_serial *serial)
1127{
1128 struct usb_serial_port *port;
1129 int i;
1130
1131 for (i = 0; i < serial->num_ports; ++i) {
1132 port = serial->port[i];
1133 if (port)
1134 usb_serial_port_unpoison_urbs(port);
1135 }
1136}
1137
1138int usb_serial_resume(struct usb_interface *intf)
1139{
1140 struct usb_serial *serial = usb_get_intfdata(intf);
1141 int rv;
1142
1143 usb_serial_unpoison_port_urbs(serial);
1144
1145 serial->suspending = 0;
1146 if (serial->type->resume)
1147 rv = serial->type->resume(serial);
1148 else
1149 rv = usb_serial_generic_resume(serial);
1150
1151 return rv;
1152}
1153EXPORT_SYMBOL(usb_serial_resume);
1154
1155static int usb_serial_reset_resume(struct usb_interface *intf)
1156{
1157 struct usb_serial *serial = usb_get_intfdata(intf);
1158 int rv;
1159
1160 usb_serial_unpoison_port_urbs(serial);
1161
1162 serial->suspending = 0;
1163 if (serial->type->reset_resume) {
1164 rv = serial->type->reset_resume(serial);
1165 } else {
1166 rv = -EOPNOTSUPP;
1167 intf->needs_binding = 1;
1168 }
1169
1170 return rv;
1171}
1172
1173static const struct tty_operations serial_ops = {
1174 .open = serial_open,
1175 .close = serial_close,
1176 .write = serial_write,
1177 .hangup = serial_hangup,
1178 .write_room = serial_write_room,
1179 .ioctl = serial_ioctl,
1180 .set_termios = serial_set_termios,
1181 .throttle = serial_throttle,
1182 .unthrottle = serial_unthrottle,
1183 .break_ctl = serial_break,
1184 .chars_in_buffer = serial_chars_in_buffer,
1185 .wait_until_sent = serial_wait_until_sent,
1186 .tiocmget = serial_tiocmget,
1187 .tiocmset = serial_tiocmset,
1188 .get_icount = serial_get_icount,
1189 .cleanup = serial_cleanup,
1190 .install = serial_install,
1191 .proc_fops = &serial_proc_fops,
1192};
1193
1194
1195struct tty_driver *usb_serial_tty_driver;
1196
1197/* Driver structure we register with the USB core */
1198static struct usb_driver usb_serial_driver = {
1199 .name = "usbserial",
1200 .probe = usb_serial_probe,
1201 .disconnect = usb_serial_disconnect,
1202 .suspend = usb_serial_suspend,
1203 .resume = usb_serial_resume,
1204 .no_dynamic_id = 1,
1205 .supports_autosuspend = 1,
1206};
1207
1208static int __init usb_serial_init(void)
1209{
1210 int result;
1211
1212 usb_serial_tty_driver = alloc_tty_driver(USB_SERIAL_TTY_MINORS);
1213 if (!usb_serial_tty_driver)
1214 return -ENOMEM;
1215
1216 /* Initialize our global data */
1217 result = bus_register(&usb_serial_bus_type);
1218 if (result) {
1219 pr_err("%s - registering bus driver failed\n", __func__);
1220 goto exit_bus;
1221 }
1222
1223 usb_serial_tty_driver->driver_name = "usbserial";
1224 usb_serial_tty_driver->name = "ttyUSB";
1225 usb_serial_tty_driver->major = USB_SERIAL_TTY_MAJOR;
1226 usb_serial_tty_driver->minor_start = 0;
1227 usb_serial_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1228 usb_serial_tty_driver->subtype = SERIAL_TYPE_NORMAL;
1229 usb_serial_tty_driver->flags = TTY_DRIVER_REAL_RAW |
1230 TTY_DRIVER_DYNAMIC_DEV;
1231 usb_serial_tty_driver->init_termios = tty_std_termios;
1232 usb_serial_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD
1233 | HUPCL | CLOCAL;
1234 usb_serial_tty_driver->init_termios.c_ispeed = 9600;
1235 usb_serial_tty_driver->init_termios.c_ospeed = 9600;
1236 tty_set_operations(usb_serial_tty_driver, &serial_ops);
1237 result = tty_register_driver(usb_serial_tty_driver);
1238 if (result) {
1239 pr_err("%s - tty_register_driver failed\n", __func__);
1240 goto exit_reg_driver;
1241 }
1242
1243 /* register the USB driver */
1244 result = usb_register(&usb_serial_driver);
1245 if (result < 0) {
1246 pr_err("%s - usb_register failed\n", __func__);
1247 goto exit_tty;
1248 }
1249
1250 /* register the generic driver, if we should */
1251 result = usb_serial_generic_register();
1252 if (result < 0) {
1253 pr_err("%s - registering generic driver failed\n", __func__);
1254 goto exit_generic;
1255 }
1256
1257 return result;
1258
1259exit_generic:
1260 usb_deregister(&usb_serial_driver);
1261
1262exit_tty:
1263 tty_unregister_driver(usb_serial_tty_driver);
1264
1265exit_reg_driver:
1266 bus_unregister(&usb_serial_bus_type);
1267
1268exit_bus:
1269 pr_err("%s - returning with error %d\n", __func__, result);
1270 put_tty_driver(usb_serial_tty_driver);
1271 return result;
1272}
1273
1274
1275static void __exit usb_serial_exit(void)
1276{
1277 usb_serial_console_exit();
1278
1279 usb_serial_generic_deregister();
1280
1281 usb_deregister(&usb_serial_driver);
1282 tty_unregister_driver(usb_serial_tty_driver);
1283 put_tty_driver(usb_serial_tty_driver);
1284 bus_unregister(&usb_serial_bus_type);
1285}
1286
1287
1288module_init(usb_serial_init);
1289module_exit(usb_serial_exit);
1290
1291#define set_to_generic_if_null(type, function) \
1292 do { \
1293 if (!type->function) { \
1294 type->function = usb_serial_generic_##function; \
1295 pr_debug("%s: using generic " #function "\n", \
1296 type->driver.name); \
1297 } \
1298 } while (0)
1299
1300static void usb_serial_operations_init(struct usb_serial_driver *device)
1301{
1302 set_to_generic_if_null(device, open);
1303 set_to_generic_if_null(device, write);
1304 set_to_generic_if_null(device, close);
1305 set_to_generic_if_null(device, write_room);
1306 set_to_generic_if_null(device, chars_in_buffer);
1307 if (device->tx_empty)
1308 set_to_generic_if_null(device, wait_until_sent);
1309 set_to_generic_if_null(device, read_bulk_callback);
1310 set_to_generic_if_null(device, write_bulk_callback);
1311 set_to_generic_if_null(device, process_read_urb);
1312 set_to_generic_if_null(device, prepare_write_buffer);
1313}
1314
1315static int usb_serial_register(struct usb_serial_driver *driver)
1316{
1317 int retval;
1318
1319 if (usb_disabled())
1320 return -ENODEV;
1321
1322 if (!driver->description)
1323 driver->description = driver->driver.name;
1324 if (!driver->usb_driver) {
1325 WARN(1, "Serial driver %s has no usb_driver\n",
1326 driver->description);
1327 return -EINVAL;
1328 }
1329
1330 usb_serial_operations_init(driver);
1331
1332 /* Add this device to our list of devices */
1333 mutex_lock(&table_lock);
1334 list_add(&driver->driver_list, &usb_serial_driver_list);
1335
1336 retval = usb_serial_bus_register(driver);
1337 if (retval) {
1338 pr_err("problem %d when registering driver %s\n", retval, driver->description);
1339 list_del(&driver->driver_list);
1340 } else {
1341 pr_info("USB Serial support registered for %s\n", driver->description);
1342 }
1343 mutex_unlock(&table_lock);
1344 return retval;
1345}
1346
1347static void usb_serial_deregister(struct usb_serial_driver *device)
1348{
1349 pr_info("USB Serial deregistering driver %s\n", device->description);
1350
1351 mutex_lock(&table_lock);
1352 list_del(&device->driver_list);
1353 mutex_unlock(&table_lock);
1354
1355 usb_serial_bus_deregister(device);
1356}
1357
1358/**
1359 * usb_serial_register_drivers - register drivers for a usb-serial module
1360 * @serial_drivers: NULL-terminated array of pointers to drivers to be registered
1361 * @name: name of the usb_driver for this set of @serial_drivers
1362 * @id_table: list of all devices this @serial_drivers set binds to
1363 *
1364 * Registers all the drivers in the @serial_drivers array, and dynamically
1365 * creates a struct usb_driver with the name @name and id_table of @id_table.
1366 */
1367int usb_serial_register_drivers(struct usb_serial_driver *const serial_drivers[],
1368 const char *name,
1369 const struct usb_device_id *id_table)
1370{
1371 int rc;
1372 struct usb_driver *udriver;
1373 struct usb_serial_driver * const *sd;
1374
1375 /*
1376 * udriver must be registered before any of the serial drivers,
1377 * because the store_new_id() routine for the serial drivers (in
1378 * bus.c) probes udriver.
1379 *
1380 * Performance hack: We don't want udriver to be probed until
1381 * the serial drivers are registered, because the probe would
1382 * simply fail for lack of a matching serial driver.
1383 * So we leave udriver's id_table set to NULL until we are all set.
1384 *
1385 * Suspend/resume support is implemented in the usb-serial core,
1386 * so fill in the PM-related fields in udriver.
1387 */
1388 udriver = kzalloc(sizeof(*udriver), GFP_KERNEL);
1389 if (!udriver)
1390 return -ENOMEM;
1391
1392 udriver->name = name;
1393 udriver->no_dynamic_id = 1;
1394 udriver->supports_autosuspend = 1;
1395 udriver->suspend = usb_serial_suspend;
1396 udriver->resume = usb_serial_resume;
1397 udriver->probe = usb_serial_probe;
1398 udriver->disconnect = usb_serial_disconnect;
1399
1400 /* we only set the reset_resume field if the serial_driver has one */
1401 for (sd = serial_drivers; *sd; ++sd) {
1402 if ((*sd)->reset_resume) {
1403 udriver->reset_resume = usb_serial_reset_resume;
1404 break;
1405 }
1406 }
1407
1408 rc = usb_register(udriver);
1409 if (rc)
1410 return rc;
1411
1412 for (sd = serial_drivers; *sd; ++sd) {
1413 (*sd)->usb_driver = udriver;
1414 rc = usb_serial_register(*sd);
1415 if (rc)
1416 goto failed;
1417 }
1418
1419 /* Now set udriver's id_table and look for matches */
1420 udriver->id_table = id_table;
1421 rc = driver_attach(&udriver->drvwrap.driver);
1422 return 0;
1423
1424 failed:
1425 while (sd-- > serial_drivers)
1426 usb_serial_deregister(*sd);
1427 usb_deregister(udriver);
1428 return rc;
1429}
1430EXPORT_SYMBOL_GPL(usb_serial_register_drivers);
1431
1432/**
1433 * usb_serial_deregister_drivers - deregister drivers for a usb-serial module
1434 * @serial_drivers: NULL-terminated array of pointers to drivers to be deregistered
1435 *
1436 * Deregisters all the drivers in the @serial_drivers array and deregisters and
1437 * frees the struct usb_driver that was created by the call to
1438 * usb_serial_register_drivers().
1439 */
1440void usb_serial_deregister_drivers(struct usb_serial_driver *const serial_drivers[])
1441{
1442 struct usb_driver *udriver = (*serial_drivers)->usb_driver;
1443
1444 for (; *serial_drivers; ++serial_drivers)
1445 usb_serial_deregister(*serial_drivers);
1446 usb_deregister(udriver);
1447 kfree(udriver);
1448}
1449EXPORT_SYMBOL_GPL(usb_serial_deregister_drivers);
1450
1451MODULE_AUTHOR(DRIVER_AUTHOR);
1452MODULE_DESCRIPTION(DRIVER_DESC);
1453MODULE_LICENSE("GPL");