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Merge remote-tracking branch 'asoc/topic/tegra' into asoc-next
[deliverable/linux.git] / drivers / usb / serial / usb-serial.c
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
56 static DEFINE_IDR(serial_minors);
57 static DEFINE_MUTEX(table_lock);
58 static 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 */
65 struct 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 }
83 exit:
84 mutex_unlock(&table_lock);
85 return port;
86 }
87
88 static 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;
108 error:
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
116 static 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
127 static 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
156 void 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 */
179 static 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
222 static 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
242 static 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 */
261 static 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
271 static 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
280 static 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 */
298 static 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
326 static 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);
340 exit:
341 return retval;
342 }
343
344 static 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
353 static 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
366 static 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
382 static 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
392 static 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
402 static 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%.4x\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
423 static 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
435 static 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
447 static 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
482 static int serial_proc_open(struct inode *inode, struct file *file)
483 {
484 return single_open(file, serial_proc_show, NULL);
485 }
486
487 static 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
495 static 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
506 static 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
518 static 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 */
535 void usb_serial_port_softint(struct usb_serial_port *port)
536 {
537 schedule_work(&port->work);
538 }
539 EXPORT_SYMBOL_GPL(usb_serial_port_softint);
540
541 static 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
549 static 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
562 static 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
575 static 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
599 static 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
618 static 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
634 static 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");
647 exit:
648 return id;
649 }
650
651 /* Caller must hold table_lock */
652 static 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
670 static 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
681 static 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
690 static 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
697 static 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 structures for this device", 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 = serial->type->bulk_out_size;
927 if (!buffer_size)
928 buffer_size = usb_endpoint_maxp(endpoint);
929 port->bulk_out_size = buffer_size;
930 port->bulk_out_endpointAddress = endpoint->bEndpointAddress;
931
932 for (j = 0; j < ARRAY_SIZE(port->write_urbs); ++j) {
933 set_bit(j, &port->write_urbs_free);
934 port->write_urbs[j] = usb_alloc_urb(0, GFP_KERNEL);
935 if (!port->write_urbs[j])
936 goto probe_error;
937 port->bulk_out_buffers[j] = kmalloc(buffer_size,
938 GFP_KERNEL);
939 if (!port->bulk_out_buffers[j])
940 goto probe_error;
941 usb_fill_bulk_urb(port->write_urbs[j], dev,
942 usb_sndbulkpipe(dev,
943 endpoint->bEndpointAddress),
944 port->bulk_out_buffers[j], buffer_size,
945 serial->type->write_bulk_callback,
946 port);
947 }
948
949 port->write_urb = port->write_urbs[0];
950 port->bulk_out_buffer = port->bulk_out_buffers[0];
951 }
952
953 if (serial->type->read_int_callback) {
954 for (i = 0; i < num_interrupt_in; ++i) {
955 endpoint = interrupt_in_endpoint[i];
956 port = serial->port[i];
957 port->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
958 if (!port->interrupt_in_urb)
959 goto probe_error;
960 buffer_size = usb_endpoint_maxp(endpoint);
961 port->interrupt_in_endpointAddress =
962 endpoint->bEndpointAddress;
963 port->interrupt_in_buffer = kmalloc(buffer_size,
964 GFP_KERNEL);
965 if (!port->interrupt_in_buffer)
966 goto probe_error;
967 usb_fill_int_urb(port->interrupt_in_urb, dev,
968 usb_rcvintpipe(dev,
969 endpoint->bEndpointAddress),
970 port->interrupt_in_buffer, buffer_size,
971 serial->type->read_int_callback, port,
972 endpoint->bInterval);
973 }
974 } else if (num_interrupt_in) {
975 dev_dbg(ddev, "The device claims to support interrupt in transfers, but read_int_callback is not defined\n");
976 }
977
978 if (serial->type->write_int_callback) {
979 for (i = 0; i < num_interrupt_out; ++i) {
980 endpoint = interrupt_out_endpoint[i];
981 port = serial->port[i];
982 port->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
983 if (!port->interrupt_out_urb)
984 goto probe_error;
985 buffer_size = usb_endpoint_maxp(endpoint);
986 port->interrupt_out_size = buffer_size;
987 port->interrupt_out_endpointAddress =
988 endpoint->bEndpointAddress;
989 port->interrupt_out_buffer = kmalloc(buffer_size,
990 GFP_KERNEL);
991 if (!port->interrupt_out_buffer)
992 goto probe_error;
993 usb_fill_int_urb(port->interrupt_out_urb, dev,
994 usb_sndintpipe(dev,
995 endpoint->bEndpointAddress),
996 port->interrupt_out_buffer, buffer_size,
997 serial->type->write_int_callback, port,
998 endpoint->bInterval);
999 }
1000 } else if (num_interrupt_out) {
1001 dev_dbg(ddev, "The device claims to support interrupt out transfers, but write_int_callback is not defined\n");
1002 }
1003
1004 usb_set_intfdata(interface, serial);
1005
1006 /* if this device type has an attach function, call it */
1007 if (type->attach) {
1008 retval = type->attach(serial);
1009 if (retval < 0)
1010 goto probe_error;
1011 serial->attached = 1;
1012 if (retval > 0) {
1013 /* quietly accept this device, but don't bind to a
1014 serial port as it's about to disappear */
1015 serial->num_ports = 0;
1016 goto exit;
1017 }
1018 } else {
1019 serial->attached = 1;
1020 }
1021
1022 /* Avoid race with tty_open and serial_install by setting the
1023 * disconnected flag and not clearing it until all ports have been
1024 * registered.
1025 */
1026 serial->disconnected = 1;
1027
1028 if (allocate_minors(serial, num_ports)) {
1029 dev_err(ddev, "No more free serial minor numbers\n");
1030 goto probe_error;
1031 }
1032
1033 /* register all of the individual ports with the driver core */
1034 for (i = 0; i < num_ports; ++i) {
1035 port = serial->port[i];
1036 dev_set_name(&port->dev, "ttyUSB%d", port->minor);
1037 dev_dbg(ddev, "registering %s", dev_name(&port->dev));
1038 device_enable_async_suspend(&port->dev);
1039
1040 retval = device_add(&port->dev);
1041 if (retval)
1042 dev_err(ddev, "Error registering port device, continuing\n");
1043 }
1044
1045 serial->disconnected = 0;
1046
1047 usb_serial_console_init(serial->port[0]->minor);
1048 exit:
1049 module_put(type->driver.owner);
1050 return 0;
1051
1052 probe_error:
1053 usb_serial_put(serial);
1054 module_put(type->driver.owner);
1055 return -EIO;
1056 }
1057
1058 static void usb_serial_disconnect(struct usb_interface *interface)
1059 {
1060 int i;
1061 struct usb_serial *serial = usb_get_intfdata(interface);
1062 struct device *dev = &interface->dev;
1063 struct usb_serial_port *port;
1064
1065 usb_serial_console_disconnect(serial);
1066
1067 mutex_lock(&serial->disc_mutex);
1068 /* must set a flag, to signal subdrivers */
1069 serial->disconnected = 1;
1070 mutex_unlock(&serial->disc_mutex);
1071
1072 for (i = 0; i < serial->num_ports; ++i) {
1073 port = serial->port[i];
1074 if (port) {
1075 struct tty_struct *tty = tty_port_tty_get(&port->port);
1076 if (tty) {
1077 tty_vhangup(tty);
1078 tty_kref_put(tty);
1079 }
1080 usb_serial_port_poison_urbs(port);
1081 wake_up_interruptible(&port->port.delta_msr_wait);
1082 cancel_work_sync(&port->work);
1083 if (device_is_registered(&port->dev))
1084 device_del(&port->dev);
1085 }
1086 }
1087 if (serial->type->disconnect)
1088 serial->type->disconnect(serial);
1089
1090 /* let the last holder of this object cause it to be cleaned up */
1091 usb_serial_put(serial);
1092 dev_info(dev, "device disconnected\n");
1093 }
1094
1095 int usb_serial_suspend(struct usb_interface *intf, pm_message_t message)
1096 {
1097 struct usb_serial *serial = usb_get_intfdata(intf);
1098 struct usb_serial_port *port;
1099 int i, r = 0;
1100
1101 serial->suspending = 1;
1102
1103 /*
1104 * serial->type->suspend() MUST return 0 in system sleep context,
1105 * otherwise, the resume callback has to recover device from
1106 * previous suspend failure.
1107 */
1108 if (serial->type->suspend) {
1109 r = serial->type->suspend(serial, message);
1110 if (r < 0) {
1111 serial->suspending = 0;
1112 goto err_out;
1113 }
1114 }
1115
1116 for (i = 0; i < serial->num_ports; ++i) {
1117 port = serial->port[i];
1118 if (port)
1119 usb_serial_port_poison_urbs(port);
1120 }
1121
1122 err_out:
1123 return r;
1124 }
1125 EXPORT_SYMBOL(usb_serial_suspend);
1126
1127 static void usb_serial_unpoison_port_urbs(struct usb_serial *serial)
1128 {
1129 struct usb_serial_port *port;
1130 int i;
1131
1132 for (i = 0; i < serial->num_ports; ++i) {
1133 port = serial->port[i];
1134 if (port)
1135 usb_serial_port_unpoison_urbs(port);
1136 }
1137 }
1138
1139 int usb_serial_resume(struct usb_interface *intf)
1140 {
1141 struct usb_serial *serial = usb_get_intfdata(intf);
1142 int rv;
1143
1144 usb_serial_unpoison_port_urbs(serial);
1145
1146 serial->suspending = 0;
1147 if (serial->type->resume)
1148 rv = serial->type->resume(serial);
1149 else
1150 rv = usb_serial_generic_resume(serial);
1151
1152 return rv;
1153 }
1154 EXPORT_SYMBOL(usb_serial_resume);
1155
1156 static int usb_serial_reset_resume(struct usb_interface *intf)
1157 {
1158 struct usb_serial *serial = usb_get_intfdata(intf);
1159 int rv;
1160
1161 usb_serial_unpoison_port_urbs(serial);
1162
1163 serial->suspending = 0;
1164 if (serial->type->reset_resume)
1165 rv = serial->type->reset_resume(serial);
1166 else {
1167 rv = -EOPNOTSUPP;
1168 intf->needs_binding = 1;
1169 }
1170
1171 return rv;
1172 }
1173
1174 static const struct tty_operations serial_ops = {
1175 .open = serial_open,
1176 .close = serial_close,
1177 .write = serial_write,
1178 .hangup = serial_hangup,
1179 .write_room = serial_write_room,
1180 .ioctl = serial_ioctl,
1181 .set_termios = serial_set_termios,
1182 .throttle = serial_throttle,
1183 .unthrottle = serial_unthrottle,
1184 .break_ctl = serial_break,
1185 .chars_in_buffer = serial_chars_in_buffer,
1186 .wait_until_sent = serial_wait_until_sent,
1187 .tiocmget = serial_tiocmget,
1188 .tiocmset = serial_tiocmset,
1189 .get_icount = serial_get_icount,
1190 .cleanup = serial_cleanup,
1191 .install = serial_install,
1192 .proc_fops = &serial_proc_fops,
1193 };
1194
1195
1196 struct tty_driver *usb_serial_tty_driver;
1197
1198 /* Driver structure we register with the USB core */
1199 static struct usb_driver usb_serial_driver = {
1200 .name = "usbserial",
1201 .probe = usb_serial_probe,
1202 .disconnect = usb_serial_disconnect,
1203 .suspend = usb_serial_suspend,
1204 .resume = usb_serial_resume,
1205 .no_dynamic_id = 1,
1206 .supports_autosuspend = 1,
1207 };
1208
1209 static int __init usb_serial_init(void)
1210 {
1211 int result;
1212
1213 usb_serial_tty_driver = alloc_tty_driver(USB_SERIAL_TTY_MINORS);
1214 if (!usb_serial_tty_driver)
1215 return -ENOMEM;
1216
1217 /* Initialize our global data */
1218 result = bus_register(&usb_serial_bus_type);
1219 if (result) {
1220 pr_err("%s - registering bus driver failed\n", __func__);
1221 goto exit_bus;
1222 }
1223
1224 usb_serial_tty_driver->driver_name = "usbserial";
1225 usb_serial_tty_driver->name = "ttyUSB";
1226 usb_serial_tty_driver->major = USB_SERIAL_TTY_MAJOR;
1227 usb_serial_tty_driver->minor_start = 0;
1228 usb_serial_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1229 usb_serial_tty_driver->subtype = SERIAL_TYPE_NORMAL;
1230 usb_serial_tty_driver->flags = TTY_DRIVER_REAL_RAW |
1231 TTY_DRIVER_DYNAMIC_DEV;
1232 usb_serial_tty_driver->init_termios = tty_std_termios;
1233 usb_serial_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD
1234 | HUPCL | CLOCAL;
1235 usb_serial_tty_driver->init_termios.c_ispeed = 9600;
1236 usb_serial_tty_driver->init_termios.c_ospeed = 9600;
1237 tty_set_operations(usb_serial_tty_driver, &serial_ops);
1238 result = tty_register_driver(usb_serial_tty_driver);
1239 if (result) {
1240 pr_err("%s - tty_register_driver failed\n", __func__);
1241 goto exit_reg_driver;
1242 }
1243
1244 /* register the USB driver */
1245 result = usb_register(&usb_serial_driver);
1246 if (result < 0) {
1247 pr_err("%s - usb_register failed\n", __func__);
1248 goto exit_tty;
1249 }
1250
1251 /* register the generic driver, if we should */
1252 result = usb_serial_generic_register();
1253 if (result < 0) {
1254 pr_err("%s - registering generic driver failed\n", __func__);
1255 goto exit_generic;
1256 }
1257
1258 return result;
1259
1260 exit_generic:
1261 usb_deregister(&usb_serial_driver);
1262
1263 exit_tty:
1264 tty_unregister_driver(usb_serial_tty_driver);
1265
1266 exit_reg_driver:
1267 bus_unregister(&usb_serial_bus_type);
1268
1269 exit_bus:
1270 pr_err("%s - returning with error %d\n", __func__, result);
1271 put_tty_driver(usb_serial_tty_driver);
1272 return result;
1273 }
1274
1275
1276 static void __exit usb_serial_exit(void)
1277 {
1278 usb_serial_console_exit();
1279
1280 usb_serial_generic_deregister();
1281
1282 usb_deregister(&usb_serial_driver);
1283 tty_unregister_driver(usb_serial_tty_driver);
1284 put_tty_driver(usb_serial_tty_driver);
1285 bus_unregister(&usb_serial_bus_type);
1286 }
1287
1288
1289 module_init(usb_serial_init);
1290 module_exit(usb_serial_exit);
1291
1292 #define set_to_generic_if_null(type, function) \
1293 do { \
1294 if (!type->function) { \
1295 type->function = usb_serial_generic_##function; \
1296 pr_debug("%s: using generic " #function "\n", \
1297 type->driver.name); \
1298 } \
1299 } while (0)
1300
1301 static void usb_serial_operations_init(struct usb_serial_driver *device)
1302 {
1303 set_to_generic_if_null(device, open);
1304 set_to_generic_if_null(device, write);
1305 set_to_generic_if_null(device, close);
1306 set_to_generic_if_null(device, write_room);
1307 set_to_generic_if_null(device, chars_in_buffer);
1308 if (device->tx_empty)
1309 set_to_generic_if_null(device, wait_until_sent);
1310 set_to_generic_if_null(device, read_bulk_callback);
1311 set_to_generic_if_null(device, write_bulk_callback);
1312 set_to_generic_if_null(device, process_read_urb);
1313 set_to_generic_if_null(device, prepare_write_buffer);
1314 }
1315
1316 static int usb_serial_register(struct usb_serial_driver *driver)
1317 {
1318 int retval;
1319
1320 if (usb_disabled())
1321 return -ENODEV;
1322
1323 if (!driver->description)
1324 driver->description = driver->driver.name;
1325 if (!driver->usb_driver) {
1326 WARN(1, "Serial driver %s has no usb_driver\n",
1327 driver->description);
1328 return -EINVAL;
1329 }
1330
1331 usb_serial_operations_init(driver);
1332
1333 /* Add this device to our list of devices */
1334 mutex_lock(&table_lock);
1335 list_add(&driver->driver_list, &usb_serial_driver_list);
1336
1337 retval = usb_serial_bus_register(driver);
1338 if (retval) {
1339 pr_err("problem %d when registering driver %s\n", retval, driver->description);
1340 list_del(&driver->driver_list);
1341 } else
1342 pr_info("USB Serial support registered for %s\n", driver->description);
1343
1344 mutex_unlock(&table_lock);
1345 return retval;
1346 }
1347
1348 static void usb_serial_deregister(struct usb_serial_driver *device)
1349 {
1350 pr_info("USB Serial deregistering driver %s\n", device->description);
1351 mutex_lock(&table_lock);
1352 list_del(&device->driver_list);
1353 usb_serial_bus_deregister(device);
1354 mutex_unlock(&table_lock);
1355 }
1356
1357 /**
1358 * usb_serial_register_drivers - register drivers for a usb-serial module
1359 * @serial_drivers: NULL-terminated array of pointers to drivers to be registered
1360 * @name: name of the usb_driver for this set of @serial_drivers
1361 * @id_table: list of all devices this @serial_drivers set binds to
1362 *
1363 * Registers all the drivers in the @serial_drivers array, and dynamically
1364 * creates a struct usb_driver with the name @name and id_table of @id_table.
1365 */
1366 int usb_serial_register_drivers(struct usb_serial_driver *const serial_drivers[],
1367 const char *name,
1368 const struct usb_device_id *id_table)
1369 {
1370 int rc;
1371 struct usb_driver *udriver;
1372 struct usb_serial_driver * const *sd;
1373
1374 /*
1375 * udriver must be registered before any of the serial drivers,
1376 * because the store_new_id() routine for the serial drivers (in
1377 * bus.c) probes udriver.
1378 *
1379 * Performance hack: We don't want udriver to be probed until
1380 * the serial drivers are registered, because the probe would
1381 * simply fail for lack of a matching serial driver.
1382 * So we leave udriver's id_table set to NULL until we are all set.
1383 *
1384 * Suspend/resume support is implemented in the usb-serial core,
1385 * so fill in the PM-related fields in udriver.
1386 */
1387 udriver = kzalloc(sizeof(*udriver), GFP_KERNEL);
1388 if (!udriver)
1389 return -ENOMEM;
1390
1391 udriver->name = name;
1392 udriver->no_dynamic_id = 1;
1393 udriver->supports_autosuspend = 1;
1394 udriver->suspend = usb_serial_suspend;
1395 udriver->resume = usb_serial_resume;
1396 udriver->probe = usb_serial_probe;
1397 udriver->disconnect = usb_serial_disconnect;
1398
1399 /* we only set the reset_resume field if the serial_driver has one */
1400 for (sd = serial_drivers; *sd; ++sd) {
1401 if ((*sd)->reset_resume) {
1402 udriver->reset_resume = usb_serial_reset_resume;
1403 break;
1404 }
1405 }
1406
1407 rc = usb_register(udriver);
1408 if (rc)
1409 return rc;
1410
1411 for (sd = serial_drivers; *sd; ++sd) {
1412 (*sd)->usb_driver = udriver;
1413 rc = usb_serial_register(*sd);
1414 if (rc)
1415 goto failed;
1416 }
1417
1418 /* Now set udriver's id_table and look for matches */
1419 udriver->id_table = id_table;
1420 rc = driver_attach(&udriver->drvwrap.driver);
1421 return 0;
1422
1423 failed:
1424 while (sd-- > serial_drivers)
1425 usb_serial_deregister(*sd);
1426 usb_deregister(udriver);
1427 return rc;
1428 }
1429 EXPORT_SYMBOL_GPL(usb_serial_register_drivers);
1430
1431 /**
1432 * usb_serial_deregister_drivers - deregister drivers for a usb-serial module
1433 * @serial_drivers: NULL-terminated array of pointers to drivers to be deregistered
1434 *
1435 * Deregisters all the drivers in the @serial_drivers array and deregisters and
1436 * frees the struct usb_driver that was created by the call to
1437 * usb_serial_register_drivers().
1438 */
1439 void usb_serial_deregister_drivers(struct usb_serial_driver *const serial_drivers[])
1440 {
1441 struct usb_driver *udriver = (*serial_drivers)->usb_driver;
1442
1443 for (; *serial_drivers; ++serial_drivers)
1444 usb_serial_deregister(*serial_drivers);
1445 usb_deregister(udriver);
1446 kfree(udriver);
1447 }
1448 EXPORT_SYMBOL_GPL(usb_serial_deregister_drivers);
1449
1450 MODULE_AUTHOR(DRIVER_AUTHOR);
1451 MODULE_DESCRIPTION(DRIVER_DESC);
1452 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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