?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
USB: fix usbfs regression
[wandboard.git] / drivers / usb / core / devio.c
blob4fd67d69b83052721da87c5a009ea1402017a1f5
1 /*****************************************************************************/
2
3 /*
4 * devio.c -- User space communication with USB devices.
5 *
6 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 * This file implements the usbfs/x/y files, where
23 * x is the bus number and y the device number.
24 *
25 * It allows user space programs/"drivers" to communicate directly
26 * with USB devices without intervening kernel driver.
27 *
28 * Revision history
29 * 22.12.1999 0.1 Initial release (split from proc_usb.c)
30 * 04.01.2000 0.2 Turned into its own filesystem
31 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
32 * (CAN-2005-3055)
33 */
34
35 /*****************************************************************************/
36
37 #include <linux/fs.h>
38 #include <linux/mm.h>
39 #include <linux/slab.h>
40 #include <linux/smp_lock.h>
41 #include <linux/signal.h>
42 #include <linux/poll.h>
43 #include <linux/module.h>
44 #include <linux/usb.h>
45 #include <linux/usbdevice_fs.h>
46 #include <linux/cdev.h>
47 #include <linux/notifier.h>
48 #include <linux/security.h>
49 #include <asm/uaccess.h>
50 #include <asm/byteorder.h>
51 #include <linux/moduleparam.h>
52
53 #include "hcd.h" /* for usbcore internals */
54 #include "usb.h"
55 #include "hub.h"
56
57 #define USB_MAXBUS 64
58 #define USB_DEVICE_MAX USB_MAXBUS * 128
59
60 /* Mutual exclusion for removal, open, and release */
61 DEFINE_MUTEX(usbfs_mutex);
62
63 struct dev_state {
64 struct list_head list; /* state list */
65 struct usb_device *dev;
66 struct file *file;
67 spinlock_t lock; /* protects the async urb lists */
68 struct list_head async_pending;
69 struct list_head async_completed;
70 wait_queue_head_t wait; /* wake up if a request completed */
71 unsigned int discsignr;
72 struct pid *disc_pid;
73 uid_t disc_uid, disc_euid;
74 void __user *disccontext;
75 unsigned long ifclaimed;
76 u32 secid;
77 u32 disabled_bulk_eps;
78 };
79
80 struct async {
81 struct list_head asynclist;
82 struct dev_state *ps;
83 struct pid *pid;
84 uid_t uid, euid;
85 unsigned int signr;
86 unsigned int ifnum;
87 void __user *userbuffer;
88 void __user *userurb;
89 struct urb *urb;
90 int status;
91 u32 secid;
92 u8 bulk_addr;
93 u8 bulk_status;
94 };
95
96 static int usbfs_snoop;
97 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
98 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
99
100 #define snoop(dev, format, arg...) \
101 do { \
102 if (usbfs_snoop) \
103 dev_info(dev , format , ## arg); \
104 } while (0)
105
106 enum snoop_when {
107 SUBMIT, COMPLETE
108 };
109
110 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
111
112 #define MAX_USBFS_BUFFER_SIZE 16384
113
114
115 static int connected(struct dev_state *ps)
116 {
117 return (!list_empty(&ps->list) &&
118 ps->dev->state != USB_STATE_NOTATTACHED);
119 }
120
121 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
122 {
123 loff_t ret;
124
125 lock_kernel();
126
127 switch (orig) {
128 case 0:
129 file->f_pos = offset;
130 ret = file->f_pos;
131 break;
132 case 1:
133 file->f_pos += offset;
134 ret = file->f_pos;
135 break;
136 case 2:
137 default:
138 ret = -EINVAL;
139 }
140
141 unlock_kernel();
142 return ret;
143 }
144
145 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
146 loff_t *ppos)
147 {
148 struct dev_state *ps = file->private_data;
149 struct usb_device *dev = ps->dev;
150 ssize_t ret = 0;
151 unsigned len;
152 loff_t pos;
153 int i;
154
155 pos = *ppos;
156 usb_lock_device(dev);
157 if (!connected(ps)) {
158 ret = -ENODEV;
159 goto err;
160 } else if (pos < 0) {
161 ret = -EINVAL;
162 goto err;
163 }
164
165 if (pos < sizeof(struct usb_device_descriptor)) {
166 /* 18 bytes - fits on the stack */
167 struct usb_device_descriptor temp_desc;
168
169 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
170 le16_to_cpus(&temp_desc.bcdUSB);
171 le16_to_cpus(&temp_desc.idVendor);
172 le16_to_cpus(&temp_desc.idProduct);
173 le16_to_cpus(&temp_desc.bcdDevice);
174
175 len = sizeof(struct usb_device_descriptor) - pos;
176 if (len > nbytes)
177 len = nbytes;
178 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
179 ret = -EFAULT;
180 goto err;
181 }
182
183 *ppos += len;
184 buf += len;
185 nbytes -= len;
186 ret += len;
187 }
188
189 pos = sizeof(struct usb_device_descriptor);
190 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
191 struct usb_config_descriptor *config =
192 (struct usb_config_descriptor *)dev->rawdescriptors[i];
193 unsigned int length = le16_to_cpu(config->wTotalLength);
194
195 if (*ppos < pos + length) {
196
197 /* The descriptor may claim to be longer than it
198 * really is. Here is the actual allocated length. */
199 unsigned alloclen =
200 le16_to_cpu(dev->config[i].desc.wTotalLength);
201
202 len = length - (*ppos - pos);
203 if (len > nbytes)
204 len = nbytes;
205
206 /* Simply don't write (skip over) unallocated parts */
207 if (alloclen > (*ppos - pos)) {
208 alloclen -= (*ppos - pos);
209 if (copy_to_user(buf,
210 dev->rawdescriptors[i] + (*ppos - pos),
211 min(len, alloclen))) {
212 ret = -EFAULT;
213 goto err;
214 }
215 }
216
217 *ppos += len;
218 buf += len;
219 nbytes -= len;
220 ret += len;
221 }
222
223 pos += length;
224 }
225
226 err:
227 usb_unlock_device(dev);
228 return ret;
229 }
230
231 /*
232 * async list handling
233 */
234
235 static struct async *alloc_async(unsigned int numisoframes)
236 {
237 struct async *as;
238
239 as = kzalloc(sizeof(struct async), GFP_KERNEL);
240 if (!as)
241 return NULL;
242 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
243 if (!as->urb) {
244 kfree(as);
245 return NULL;
246 }
247 return as;
248 }
249
250 static void free_async(struct async *as)
251 {
252 put_pid(as->pid);
253 kfree(as->urb->transfer_buffer);
254 kfree(as->urb->setup_packet);
255 usb_free_urb(as->urb);
256 kfree(as);
257 }
258
259 static void async_newpending(struct async *as)
260 {
261 struct dev_state *ps = as->ps;
262 unsigned long flags;
263
264 spin_lock_irqsave(&ps->lock, flags);
265 list_add_tail(&as->asynclist, &ps->async_pending);
266 spin_unlock_irqrestore(&ps->lock, flags);
267 }
268
269 static void async_removepending(struct async *as)
270 {
271 struct dev_state *ps = as->ps;
272 unsigned long flags;
273
274 spin_lock_irqsave(&ps->lock, flags);
275 list_del_init(&as->asynclist);
276 spin_unlock_irqrestore(&ps->lock, flags);
277 }
278
279 static struct async *async_getcompleted(struct dev_state *ps)
280 {
281 unsigned long flags;
282 struct async *as = NULL;
283
284 spin_lock_irqsave(&ps->lock, flags);
285 if (!list_empty(&ps->async_completed)) {
286 as = list_entry(ps->async_completed.next, struct async,
287 asynclist);
288 list_del_init(&as->asynclist);
289 }
290 spin_unlock_irqrestore(&ps->lock, flags);
291 return as;
292 }
293
294 static struct async *async_getpending(struct dev_state *ps,
295 void __user *userurb)
296 {
297 unsigned long flags;
298 struct async *as;
299
300 spin_lock_irqsave(&ps->lock, flags);
301 list_for_each_entry(as, &ps->async_pending, asynclist)
302 if (as->userurb == userurb) {
303 list_del_init(&as->asynclist);
304 spin_unlock_irqrestore(&ps->lock, flags);
305 return as;
306 }
307 spin_unlock_irqrestore(&ps->lock, flags);
308 return NULL;
309 }
310
311 static void snoop_urb(struct usb_device *udev,
312 void __user *userurb, int pipe, unsigned length,
313 int timeout_or_status, enum snoop_when when)
314 {
315 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
316 static const char *dirs[] = {"out", "in"};
317 int ep;
318 const char *t, *d;
319
320 if (!usbfs_snoop)
321 return;
322
323 ep = usb_pipeendpoint(pipe);
324 t = types[usb_pipetype(pipe)];
325 d = dirs[!!usb_pipein(pipe)];
326
327 if (userurb) { /* Async */
328 if (when == SUBMIT)
329 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
330 "length %u\n",
331 userurb, ep, t, d, length);
332 else
333 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
334 "actual_length %u status %d\n",
335 userurb, ep, t, d, length,
336 timeout_or_status);
337 } else {
338 if (when == SUBMIT)
339 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
340 "timeout %d\n",
341 ep, t, d, length, timeout_or_status);
342 else
343 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
344 "status %d\n",
345 ep, t, d, length, timeout_or_status);
346 }
347 }
348
349 #define AS_CONTINUATION 1
350 #define AS_UNLINK 2
351
352 static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr)
353 __releases(ps->lock)
354 __acquires(ps->lock)
355 {
356 struct async *as;
357
358 /* Mark all the pending URBs that match bulk_addr, up to but not
359 * including the first one without AS_CONTINUATION. If such an
360 * URB is encountered then a new transfer has already started so
361 * the endpoint doesn't need to be disabled; otherwise it does.
362 */
363 list_for_each_entry(as, &ps->async_pending, asynclist) {
364 if (as->bulk_addr == bulk_addr) {
365 if (as->bulk_status != AS_CONTINUATION)
366 goto rescan;
367 as->bulk_status = AS_UNLINK;
368 as->bulk_addr = 0;
369 }
370 }
371 ps->disabled_bulk_eps |= (1 << bulk_addr);
372
373 /* Now carefully unlink all the marked pending URBs */
374 rescan:
375 list_for_each_entry(as, &ps->async_pending, asynclist) {
376 if (as->bulk_status == AS_UNLINK) {
377 as->bulk_status = 0; /* Only once */
378 spin_unlock(&ps->lock); /* Allow completions */
379 usb_unlink_urb(as->urb);
380 spin_lock(&ps->lock);
381 goto rescan;
382 }
383 }
384 }
385
386 static void async_completed(struct urb *urb)
387 {
388 struct async *as = urb->context;
389 struct dev_state *ps = as->ps;
390 struct siginfo sinfo;
391 struct pid *pid = NULL;
392 uid_t uid = 0;
393 uid_t euid = 0;
394 u32 secid = 0;
395 int signr;
396
397 spin_lock(&ps->lock);
398 list_move_tail(&as->asynclist, &ps->async_completed);
399 as->status = urb->status;
400 signr = as->signr;
401 if (signr) {
402 sinfo.si_signo = as->signr;
403 sinfo.si_errno = as->status;
404 sinfo.si_code = SI_ASYNCIO;
405 sinfo.si_addr = as->userurb;
406 pid = as->pid;
407 uid = as->uid;
408 euid = as->euid;
409 secid = as->secid;
410 }
411 snoop(&urb->dev->dev, "urb complete\n");
412 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
413 as->status, COMPLETE);
414 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
415 as->status != -ENOENT)
416 cancel_bulk_urbs(ps, as->bulk_addr);
417 spin_unlock(&ps->lock);
418
419 if (signr)
420 kill_pid_info_as_uid(sinfo.si_signo, &sinfo, pid, uid,
421 euid, secid);
422
423 wake_up(&ps->wait);
424 }
425
426 static void destroy_async(struct dev_state *ps, struct list_head *list)
427 {
428 struct async *as;
429 unsigned long flags;
430
431 spin_lock_irqsave(&ps->lock, flags);
432 while (!list_empty(list)) {
433 as = list_entry(list->next, struct async, asynclist);
434 list_del_init(&as->asynclist);
435
436 /* drop the spinlock so the completion handler can run */
437 spin_unlock_irqrestore(&ps->lock, flags);
438 usb_kill_urb(as->urb);
439 spin_lock_irqsave(&ps->lock, flags);
440 }
441 spin_unlock_irqrestore(&ps->lock, flags);
442 }
443
444 static void destroy_async_on_interface(struct dev_state *ps,
445 unsigned int ifnum)
446 {
447 struct list_head *p, *q, hitlist;
448 unsigned long flags;
449
450 INIT_LIST_HEAD(&hitlist);
451 spin_lock_irqsave(&ps->lock, flags);
452 list_for_each_safe(p, q, &ps->async_pending)
453 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
454 list_move_tail(p, &hitlist);
455 spin_unlock_irqrestore(&ps->lock, flags);
456 destroy_async(ps, &hitlist);
457 }
458
459 static void destroy_all_async(struct dev_state *ps)
460 {
461 destroy_async(ps, &ps->async_pending);
462 }
463
464 /*
465 * interface claims are made only at the request of user level code,
466 * which can also release them (explicitly or by closing files).
467 * they're also undone when devices disconnect.
468 */
469
470 static int driver_probe(struct usb_interface *intf,
471 const struct usb_device_id *id)
472 {
473 return -ENODEV;
474 }
475
476 static void driver_disconnect(struct usb_interface *intf)
477 {
478 struct dev_state *ps = usb_get_intfdata(intf);
479 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
480
481 if (!ps)
482 return;
483
484 /* NOTE: this relies on usbcore having canceled and completed
485 * all pending I/O requests; 2.6 does that.
486 */
487
488 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
489 clear_bit(ifnum, &ps->ifclaimed);
490 else
491 dev_warn(&intf->dev, "interface number %u out of range\n",
492 ifnum);
493
494 usb_set_intfdata(intf, NULL);
495
496 /* force async requests to complete */
497 destroy_async_on_interface(ps, ifnum);
498 }
499
500 /* The following routines are merely placeholders. There is no way
501 * to inform a user task about suspend or resumes.
502 */
503 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
504 {
505 return 0;
506 }
507
508 static int driver_resume(struct usb_interface *intf)
509 {
510 return 0;
511 }
512
513 struct usb_driver usbfs_driver = {
514 .name = "usbfs",
515 .probe = driver_probe,
516 .disconnect = driver_disconnect,
517 .suspend = driver_suspend,
518 .resume = driver_resume,
519 };
520
521 static int claimintf(struct dev_state *ps, unsigned int ifnum)
522 {
523 struct usb_device *dev = ps->dev;
524 struct usb_interface *intf;
525 int err;
526
527 if (ifnum >= 8*sizeof(ps->ifclaimed))
528 return -EINVAL;
529 /* already claimed */
530 if (test_bit(ifnum, &ps->ifclaimed))
531 return 0;
532
533 intf = usb_ifnum_to_if(dev, ifnum);
534 if (!intf)
535 err = -ENOENT;
536 else
537 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
538 if (err == 0)
539 set_bit(ifnum, &ps->ifclaimed);
540 return err;
541 }
542
543 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
544 {
545 struct usb_device *dev;
546 struct usb_interface *intf;
547 int err;
548
549 err = -EINVAL;
550 if (ifnum >= 8*sizeof(ps->ifclaimed))
551 return err;
552 dev = ps->dev;
553 intf = usb_ifnum_to_if(dev, ifnum);
554 if (!intf)
555 err = -ENOENT;
556 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
557 usb_driver_release_interface(&usbfs_driver, intf);
558 err = 0;
559 }
560 return err;
561 }
562
563 static int checkintf(struct dev_state *ps, unsigned int ifnum)
564 {
565 if (ps->dev->state != USB_STATE_CONFIGURED)
566 return -EHOSTUNREACH;
567 if (ifnum >= 8*sizeof(ps->ifclaimed))
568 return -EINVAL;
569 if (test_bit(ifnum, &ps->ifclaimed))
570 return 0;
571 /* if not yet claimed, claim it for the driver */
572 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
573 "interface %u before use\n", task_pid_nr(current),
574 current->comm, ifnum);
575 return claimintf(ps, ifnum);
576 }
577
578 static int findintfep(struct usb_device *dev, unsigned int ep)
579 {
580 unsigned int i, j, e;
581 struct usb_interface *intf;
582 struct usb_host_interface *alts;
583 struct usb_endpoint_descriptor *endpt;
584
585 if (ep & ~(USB_DIR_IN|0xf))
586 return -EINVAL;
587 if (!dev->actconfig)
588 return -ESRCH;
589 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
590 intf = dev->actconfig->interface[i];
591 for (j = 0; j < intf->num_altsetting; j++) {
592 alts = &intf->altsetting[j];
593 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
594 endpt = &alts->endpoint[e].desc;
595 if (endpt->bEndpointAddress == ep)
596 return alts->desc.bInterfaceNumber;
597 }
598 }
599 }
600 return -ENOENT;
601 }
602
603 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
604 unsigned int index)
605 {
606 int ret = 0;
607
608 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
609 && ps->dev->state != USB_STATE_ADDRESS
610 && ps->dev->state != USB_STATE_CONFIGURED)
611 return -EHOSTUNREACH;
612 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
613 return 0;
614
615 index &= 0xff;
616 switch (requesttype & USB_RECIP_MASK) {
617 case USB_RECIP_ENDPOINT:
618 ret = findintfep(ps->dev, index);
619 if (ret >= 0)
620 ret = checkintf(ps, ret);
621 break;
622
623 case USB_RECIP_INTERFACE:
624 ret = checkintf(ps, index);
625 break;
626 }
627 return ret;
628 }
629
630 static int match_devt(struct device *dev, void *data)
631 {
632 return dev->devt == (dev_t) (unsigned long) data;
633 }
634
635 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
636 {
637 struct device *dev;
638
639 dev = bus_find_device(&usb_bus_type, NULL,
640 (void *) (unsigned long) devt, match_devt);
641 if (!dev)
642 return NULL;
643 return container_of(dev, struct usb_device, dev);
644 }
645
646 /*
647 * file operations
648 */
649 static int usbdev_open(struct inode *inode, struct file *file)
650 {
651 struct usb_device *dev = NULL;
652 struct dev_state *ps;
653 const struct cred *cred = current_cred();
654 int ret;
655
656 lock_kernel();
657 /* Protect against simultaneous removal or release */
658 mutex_lock(&usbfs_mutex);
659
660 ret = -ENOMEM;
661 ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
662 if (!ps)
663 goto out;
664
665 ret = -ENODEV;
666
667 /* usbdev device-node */
668 if (imajor(inode) == USB_DEVICE_MAJOR)
669 dev = usbdev_lookup_by_devt(inode->i_rdev);
670 #ifdef CONFIG_USB_DEVICEFS
671 /* procfs file */
672 if (!dev) {
673 dev = inode->i_private;
674 if (dev && dev->usbfs_dentry &&
675 dev->usbfs_dentry->d_inode == inode)
676 usb_get_dev(dev);
677 else
678 dev = NULL;
679 }
680 #endif
681 if (!dev || dev->state == USB_STATE_NOTATTACHED)
682 goto out;
683 ret = usb_autoresume_device(dev);
684 if (ret)
685 goto out;
686
687 ret = 0;
688 ps->dev = dev;
689 ps->file = file;
690 spin_lock_init(&ps->lock);
691 INIT_LIST_HEAD(&ps->list);
692 INIT_LIST_HEAD(&ps->async_pending);
693 INIT_LIST_HEAD(&ps->async_completed);
694 init_waitqueue_head(&ps->wait);
695 ps->discsignr = 0;
696 ps->disc_pid = get_pid(task_pid(current));
697 ps->disc_uid = cred->uid;
698 ps->disc_euid = cred->euid;
699 ps->disccontext = NULL;
700 ps->ifclaimed = 0;
701 security_task_getsecid(current, &ps->secid);
702 smp_wmb();
703 list_add_tail(&ps->list, &dev->filelist);
704 file->private_data = ps;
705 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
706 current->comm);
707 out:
708 if (ret) {
709 kfree(ps);
710 usb_put_dev(dev);
711 }
712 mutex_unlock(&usbfs_mutex);
713 unlock_kernel();
714 return ret;
715 }
716
717 static int usbdev_release(struct inode *inode, struct file *file)
718 {
719 struct dev_state *ps = file->private_data;
720 struct usb_device *dev = ps->dev;
721 unsigned int ifnum;
722 struct async *as;
723
724 usb_lock_device(dev);
725 usb_hub_release_all_ports(dev, ps);
726
727 /* Protect against simultaneous open */
728 mutex_lock(&usbfs_mutex);
729 list_del_init(&ps->list);
730 mutex_unlock(&usbfs_mutex);
731
732 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
733 ifnum++) {
734 if (test_bit(ifnum, &ps->ifclaimed))
735 releaseintf(ps, ifnum);
736 }
737 destroy_all_async(ps);
738 usb_autosuspend_device(dev);
739 usb_unlock_device(dev);
740 usb_put_dev(dev);
741 put_pid(ps->disc_pid);
742
743 as = async_getcompleted(ps);
744 while (as) {
745 free_async(as);
746 as = async_getcompleted(ps);
747 }
748 kfree(ps);
749 return 0;
750 }
751
752 static int proc_control(struct dev_state *ps, void __user *arg)
753 {
754 struct usb_device *dev = ps->dev;
755 struct usbdevfs_ctrltransfer ctrl;
756 unsigned int tmo;
757 unsigned char *tbuf;
758 unsigned wLength;
759 int i, pipe, ret;
760
761 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
762 return -EFAULT;
763 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
764 if (ret)
765 return ret;
766 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
767 if (wLength > PAGE_SIZE)
768 return -EINVAL;
769 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
770 if (!tbuf)
771 return -ENOMEM;
772 tmo = ctrl.timeout;
773 if (ctrl.bRequestType & 0x80) {
774 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
775 ctrl.wLength)) {
776 free_page((unsigned long)tbuf);
777 return -EINVAL;
778 }
779 pipe = usb_rcvctrlpipe(dev, 0);
780 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT);
781
782 usb_unlock_device(dev);
783 i = usb_control_msg(dev, pipe, ctrl.bRequest,
784 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
785 tbuf, ctrl.wLength, tmo);
786 usb_lock_device(dev);
787 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE);
788
789 if ((i > 0) && ctrl.wLength) {
790 if (copy_to_user(ctrl.data, tbuf, i)) {
791 free_page((unsigned long)tbuf);
792 return -EFAULT;
793 }
794 }
795 } else {
796 if (ctrl.wLength) {
797 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
798 free_page((unsigned long)tbuf);
799 return -EFAULT;
800 }
801 }
802 pipe = usb_sndctrlpipe(dev, 0);
803 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT);
804
805 usb_unlock_device(dev);
806 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
807 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
808 tbuf, ctrl.wLength, tmo);
809 usb_lock_device(dev);
810 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE);
811 }
812 free_page((unsigned long)tbuf);
813 if (i < 0 && i != -EPIPE) {
814 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
815 "failed cmd %s rqt %u rq %u len %u ret %d\n",
816 current->comm, ctrl.bRequestType, ctrl.bRequest,
817 ctrl.wLength, i);
818 }
819 return i;
820 }
821
822 static int proc_bulk(struct dev_state *ps, void __user *arg)
823 {
824 struct usb_device *dev = ps->dev;
825 struct usbdevfs_bulktransfer bulk;
826 unsigned int tmo, len1, pipe;
827 int len2;
828 unsigned char *tbuf;
829 int i, ret;
830
831 if (copy_from_user(&bulk, arg, sizeof(bulk)))
832 return -EFAULT;
833 ret = findintfep(ps->dev, bulk.ep);
834 if (ret < 0)
835 return ret;
836 ret = checkintf(ps, ret);
837 if (ret)
838 return ret;
839 if (bulk.ep & USB_DIR_IN)
840 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
841 else
842 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
843 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
844 return -EINVAL;
845 len1 = bulk.len;
846 if (len1 > MAX_USBFS_BUFFER_SIZE)
847 return -EINVAL;
848 if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
849 return -ENOMEM;
850 tmo = bulk.timeout;
851 if (bulk.ep & 0x80) {
852 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
853 kfree(tbuf);
854 return -EINVAL;
855 }
856 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT);
857
858 usb_unlock_device(dev);
859 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
860 usb_lock_device(dev);
861 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE);
862
863 if (!i && len2) {
864 if (copy_to_user(bulk.data, tbuf, len2)) {
865 kfree(tbuf);
866 return -EFAULT;
867 }
868 }
869 } else {
870 if (len1) {
871 if (copy_from_user(tbuf, bulk.data, len1)) {
872 kfree(tbuf);
873 return -EFAULT;
874 }
875 }
876 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT);
877
878 usb_unlock_device(dev);
879 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
880 usb_lock_device(dev);
881 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE);
882 }
883 kfree(tbuf);
884 if (i < 0)
885 return i;
886 return len2;
887 }
888
889 static int proc_resetep(struct dev_state *ps, void __user *arg)
890 {
891 unsigned int ep;
892 int ret;
893
894 if (get_user(ep, (unsigned int __user *)arg))
895 return -EFAULT;
896 ret = findintfep(ps->dev, ep);
897 if (ret < 0)
898 return ret;
899 ret = checkintf(ps, ret);
900 if (ret)
901 return ret;
902 usb_reset_endpoint(ps->dev, ep);
903 return 0;
904 }
905
906 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
907 {
908 unsigned int ep;
909 int pipe;
910 int ret;
911
912 if (get_user(ep, (unsigned int __user *)arg))
913 return -EFAULT;
914 ret = findintfep(ps->dev, ep);
915 if (ret < 0)
916 return ret;
917 ret = checkintf(ps, ret);
918 if (ret)
919 return ret;
920 if (ep & USB_DIR_IN)
921 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
922 else
923 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
924
925 return usb_clear_halt(ps->dev, pipe);
926 }
927
928 static int proc_getdriver(struct dev_state *ps, void __user *arg)
929 {
930 struct usbdevfs_getdriver gd;
931 struct usb_interface *intf;
932 int ret;
933
934 if (copy_from_user(&gd, arg, sizeof(gd)))
935 return -EFAULT;
936 intf = usb_ifnum_to_if(ps->dev, gd.interface);
937 if (!intf || !intf->dev.driver)
938 ret = -ENODATA;
939 else {
940 strncpy(gd.driver, intf->dev.driver->name,
941 sizeof(gd.driver));
942 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
943 }
944 return ret;
945 }
946
947 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
948 {
949 struct usbdevfs_connectinfo ci;
950
951 ci.devnum = ps->dev->devnum;
952 ci.slow = ps->dev->speed == USB_SPEED_LOW;
953 if (copy_to_user(arg, &ci, sizeof(ci)))
954 return -EFAULT;
955 return 0;
956 }
957
958 static int proc_resetdevice(struct dev_state *ps)
959 {
960 return usb_reset_device(ps->dev);
961 }
962
963 static int proc_setintf(struct dev_state *ps, void __user *arg)
964 {
965 struct usbdevfs_setinterface setintf;
966 int ret;
967
968 if (copy_from_user(&setintf, arg, sizeof(setintf)))
969 return -EFAULT;
970 if ((ret = checkintf(ps, setintf.interface)))
971 return ret;
972 return usb_set_interface(ps->dev, setintf.interface,
973 setintf.altsetting);
974 }
975
976 static int proc_setconfig(struct dev_state *ps, void __user *arg)
977 {
978 int u;
979 int status = 0;
980 struct usb_host_config *actconfig;
981
982 if (get_user(u, (int __user *)arg))
983 return -EFAULT;
984
985 actconfig = ps->dev->actconfig;
986
987 /* Don't touch the device if any interfaces are claimed.
988 * It could interfere with other drivers' operations, and if
989 * an interface is claimed by usbfs it could easily deadlock.
990 */
991 if (actconfig) {
992 int i;
993
994 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
995 if (usb_interface_claimed(actconfig->interface[i])) {
996 dev_warn(&ps->dev->dev,
997 "usbfs: interface %d claimed by %s "
998 "while '%s' sets config #%d\n",
999 actconfig->interface[i]
1000 ->cur_altsetting
1001 ->desc.bInterfaceNumber,
1002 actconfig->interface[i]
1003 ->dev.driver->name,
1004 current->comm, u);
1005 status = -EBUSY;
1006 break;
1007 }
1008 }
1009 }
1010
1011 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1012 * so avoid usb_set_configuration()'s kick to sysfs
1013 */
1014 if (status == 0) {
1015 if (actconfig && actconfig->desc.bConfigurationValue == u)
1016 status = usb_reset_configuration(ps->dev);
1017 else
1018 status = usb_set_configuration(ps->dev, u);
1019 }
1020
1021 return status;
1022 }
1023
1024 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1025 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1026 void __user *arg)
1027 {
1028 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1029 struct usb_host_endpoint *ep;
1030 struct async *as;
1031 struct usb_ctrlrequest *dr = NULL;
1032 const struct cred *cred = current_cred();
1033 unsigned int u, totlen, isofrmlen;
1034 int ret, ifnum = -1;
1035 int is_in;
1036
1037 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1038 USBDEVFS_URB_SHORT_NOT_OK |
1039 USBDEVFS_URB_BULK_CONTINUATION |
1040 USBDEVFS_URB_NO_FSBR |
1041 USBDEVFS_URB_ZERO_PACKET |
1042 USBDEVFS_URB_NO_INTERRUPT))
1043 return -EINVAL;
1044 if (uurb->buffer_length > 0 && !uurb->buffer)
1045 return -EINVAL;
1046 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1047 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1048 ifnum = findintfep(ps->dev, uurb->endpoint);
1049 if (ifnum < 0)
1050 return ifnum;
1051 ret = checkintf(ps, ifnum);
1052 if (ret)
1053 return ret;
1054 }
1055 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1056 is_in = 1;
1057 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1058 } else {
1059 is_in = 0;
1060 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1061 }
1062 if (!ep)
1063 return -ENOENT;
1064 switch(uurb->type) {
1065 case USBDEVFS_URB_TYPE_CONTROL:
1066 if (!usb_endpoint_xfer_control(&ep->desc))
1067 return -EINVAL;
1068 /* min 8 byte setup packet,
1069 * max 8 byte setup plus an arbitrary data stage */
1070 if (uurb->buffer_length < 8 ||
1071 uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1072 return -EINVAL;
1073 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1074 if (!dr)
1075 return -ENOMEM;
1076 if (copy_from_user(dr, uurb->buffer, 8)) {
1077 kfree(dr);
1078 return -EFAULT;
1079 }
1080 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1081 kfree(dr);
1082 return -EINVAL;
1083 }
1084 ret = check_ctrlrecip(ps, dr->bRequestType,
1085 le16_to_cpup(&dr->wIndex));
1086 if (ret) {
1087 kfree(dr);
1088 return ret;
1089 }
1090 uurb->number_of_packets = 0;
1091 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1092 uurb->buffer += 8;
1093 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1094 is_in = 1;
1095 uurb->endpoint |= USB_DIR_IN;
1096 } else {
1097 is_in = 0;
1098 uurb->endpoint &= ~USB_DIR_IN;
1099 }
1100 break;
1101
1102 case USBDEVFS_URB_TYPE_BULK:
1103 switch (usb_endpoint_type(&ep->desc)) {
1104 case USB_ENDPOINT_XFER_CONTROL:
1105 case USB_ENDPOINT_XFER_ISOC:
1106 return -EINVAL;
1107 /* allow single-shot interrupt transfers, at bogus rates */
1108 }
1109 uurb->number_of_packets = 0;
1110 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1111 return -EINVAL;
1112 break;
1113
1114 case USBDEVFS_URB_TYPE_ISO:
1115 /* arbitrary limit */
1116 if (uurb->number_of_packets < 1 ||
1117 uurb->number_of_packets > 128)
1118 return -EINVAL;
1119 if (!usb_endpoint_xfer_isoc(&ep->desc))
1120 return -EINVAL;
1121 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1122 uurb->number_of_packets;
1123 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1124 return -ENOMEM;
1125 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1126 kfree(isopkt);
1127 return -EFAULT;
1128 }
1129 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1130 /* arbitrary limit,
1131 * sufficient for USB 2.0 high-bandwidth iso */
1132 if (isopkt[u].length > 8192) {
1133 kfree(isopkt);
1134 return -EINVAL;
1135 }
1136 totlen += isopkt[u].length;
1137 }
1138 /* 3072 * 64 microframes */
1139 if (totlen > 196608) {
1140 kfree(isopkt);
1141 return -EINVAL;
1142 }
1143 uurb->buffer_length = totlen;
1144 break;
1145
1146 case USBDEVFS_URB_TYPE_INTERRUPT:
1147 uurb->number_of_packets = 0;
1148 if (!usb_endpoint_xfer_int(&ep->desc))
1149 return -EINVAL;
1150 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1151 return -EINVAL;
1152 break;
1153
1154 default:
1155 return -EINVAL;
1156 }
1157 if (uurb->buffer_length > 0 &&
1158 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1159 uurb->buffer, uurb->buffer_length)) {
1160 kfree(isopkt);
1161 kfree(dr);
1162 return -EFAULT;
1163 }
1164 as = alloc_async(uurb->number_of_packets);
1165 if (!as) {
1166 kfree(isopkt);
1167 kfree(dr);
1168 return -ENOMEM;
1169 }
1170 if (uurb->buffer_length > 0) {
1171 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1172 GFP_KERNEL);
1173 if (!as->urb->transfer_buffer) {
1174 kfree(isopkt);
1175 kfree(dr);
1176 free_async(as);
1177 return -ENOMEM;
1178 }
1179 /* Isochronous input data may end up being discontiguous
1180 * if some of the packets are short. Clear the buffer so
1181 * that the gaps don't leak kernel data to userspace.
1182 */
1183 if (is_in && uurb->type == USBDEVFS_URB_TYPE_ISO)
1184 memset(as->urb->transfer_buffer, 0,
1185 uurb->buffer_length);
1186 }
1187 as->urb->dev = ps->dev;
1188 as->urb->pipe = (uurb->type << 30) |
1189 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1190 (uurb->endpoint & USB_DIR_IN);
1191
1192 /* This tedious sequence is necessary because the URB_* flags
1193 * are internal to the kernel and subject to change, whereas
1194 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1195 */
1196 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1197 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1198 u |= URB_ISO_ASAP;
1199 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1200 u |= URB_SHORT_NOT_OK;
1201 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1202 u |= URB_NO_FSBR;
1203 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1204 u |= URB_ZERO_PACKET;
1205 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1206 u |= URB_NO_INTERRUPT;
1207 as->urb->transfer_flags = u;
1208
1209 as->urb->transfer_buffer_length = uurb->buffer_length;
1210 as->urb->setup_packet = (unsigned char *)dr;
1211 as->urb->start_frame = uurb->start_frame;
1212 as->urb->number_of_packets = uurb->number_of_packets;
1213 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1214 ps->dev->speed == USB_SPEED_HIGH)
1215 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1216 else
1217 as->urb->interval = ep->desc.bInterval;
1218 as->urb->context = as;
1219 as->urb->complete = async_completed;
1220 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1221 as->urb->iso_frame_desc[u].offset = totlen;
1222 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1223 totlen += isopkt[u].length;
1224 }
1225 kfree(isopkt);
1226 as->ps = ps;
1227 as->userurb = arg;
1228 if (is_in && uurb->buffer_length > 0)
1229 as->userbuffer = uurb->buffer;
1230 else
1231 as->userbuffer = NULL;
1232 as->signr = uurb->signr;
1233 as->ifnum = ifnum;
1234 as->pid = get_pid(task_pid(current));
1235 as->uid = cred->uid;
1236 as->euid = cred->euid;
1237 security_task_getsecid(current, &as->secid);
1238 if (!is_in && uurb->buffer_length > 0) {
1239 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1240 uurb->buffer_length)) {
1241 free_async(as);
1242 return -EFAULT;
1243 }
1244 }
1245 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1246 as->urb->transfer_buffer_length, 0, SUBMIT);
1247 async_newpending(as);
1248
1249 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1250 spin_lock_irq(&ps->lock);
1251
1252 /* Not exactly the endpoint address; the direction bit is
1253 * shifted to the 0x10 position so that the value will be
1254 * between 0 and 31.
1255 */
1256 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1257 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1258 >> 3);
1259
1260 /* If this bulk URB is the start of a new transfer, re-enable
1261 * the endpoint. Otherwise mark it as a continuation URB.
1262 */
1263 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1264 as->bulk_status = AS_CONTINUATION;
1265 else
1266 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1267
1268 /* Don't accept continuation URBs if the endpoint is
1269 * disabled because of an earlier error.
1270 */
1271 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1272 ret = -EREMOTEIO;
1273 else
1274 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1275 spin_unlock_irq(&ps->lock);
1276 } else {
1277 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1278 }
1279
1280 if (ret) {
1281 dev_printk(KERN_DEBUG, &ps->dev->dev,
1282 "usbfs: usb_submit_urb returned %d\n", ret);
1283 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1284 0, ret, COMPLETE);
1285 async_removepending(as);
1286 free_async(as);
1287 return ret;
1288 }
1289 return 0;
1290 }
1291
1292 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1293 {
1294 struct usbdevfs_urb uurb;
1295
1296 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1297 return -EFAULT;
1298
1299 return proc_do_submiturb(ps, &uurb,
1300 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1301 arg);
1302 }
1303
1304 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1305 {
1306 struct async *as;
1307
1308 as = async_getpending(ps, arg);
1309 if (!as)
1310 return -EINVAL;
1311 usb_kill_urb(as->urb);
1312 return 0;
1313 }
1314
1315 static int processcompl(struct async *as, void __user * __user *arg)
1316 {
1317 struct urb *urb = as->urb;
1318 struct usbdevfs_urb __user *userurb = as->userurb;
1319 void __user *addr = as->userurb;
1320 unsigned int i;
1321
1322 if (as->userbuffer && urb->actual_length) {
1323 if (urb->number_of_packets > 0) /* Isochronous */
1324 i = urb->transfer_buffer_length;
1325 else /* Non-Isoc */
1326 i = urb->actual_length;
1327 if (copy_to_user(as->userbuffer, urb->transfer_buffer, i))
1328 goto err_out;
1329 }
1330 if (put_user(as->status, &userurb->status))
1331 goto err_out;
1332 if (put_user(urb->actual_length, &userurb->actual_length))
1333 goto err_out;
1334 if (put_user(urb->error_count, &userurb->error_count))
1335 goto err_out;
1336
1337 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1338 for (i = 0; i < urb->number_of_packets; i++) {
1339 if (put_user(urb->iso_frame_desc[i].actual_length,
1340 &userurb->iso_frame_desc[i].actual_length))
1341 goto err_out;
1342 if (put_user(urb->iso_frame_desc[i].status,
1343 &userurb->iso_frame_desc[i].status))
1344 goto err_out;
1345 }
1346 }
1347
1348 if (put_user(addr, (void __user * __user *)arg))
1349 return -EFAULT;
1350 return 0;
1351
1352 err_out:
1353 return -EFAULT;
1354 }
1355
1356 static struct async *reap_as(struct dev_state *ps)
1357 {
1358 DECLARE_WAITQUEUE(wait, current);
1359 struct async *as = NULL;
1360 struct usb_device *dev = ps->dev;
1361
1362 add_wait_queue(&ps->wait, &wait);
1363 for (;;) {
1364 __set_current_state(TASK_INTERRUPTIBLE);
1365 as = async_getcompleted(ps);
1366 if (as)
1367 break;
1368 if (signal_pending(current))
1369 break;
1370 usb_unlock_device(dev);
1371 schedule();
1372 usb_lock_device(dev);
1373 }
1374 remove_wait_queue(&ps->wait, &wait);
1375 set_current_state(TASK_RUNNING);
1376 return as;
1377 }
1378
1379 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1380 {
1381 struct async *as = reap_as(ps);
1382 if (as) {
1383 int retval = processcompl(as, (void __user * __user *)arg);
1384 free_async(as);
1385 return retval;
1386 }
1387 if (signal_pending(current))
1388 return -EINTR;
1389 return -EIO;
1390 }
1391
1392 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1393 {
1394 int retval;
1395 struct async *as;
1396
1397 as = async_getcompleted(ps);
1398 retval = -EAGAIN;
1399 if (as) {
1400 retval = processcompl(as, (void __user * __user *)arg);
1401 free_async(as);
1402 }
1403 return retval;
1404 }
1405
1406 #ifdef CONFIG_COMPAT
1407 static int proc_control_compat(struct dev_state *ps,
1408 struct usbdevfs_ctrltransfer32 __user *p32)
1409 {
1410 struct usbdevfs_ctrltransfer __user *p;
1411 __u32 udata;
1412 p = compat_alloc_user_space(sizeof(*p));
1413 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1414 get_user(udata, &p32->data) ||
1415 put_user(compat_ptr(udata), &p->data))
1416 return -EFAULT;
1417 return proc_control(ps, p);
1418 }
1419
1420 static int proc_bulk_compat(struct dev_state *ps,
1421 struct usbdevfs_bulktransfer32 __user *p32)
1422 {
1423 struct usbdevfs_bulktransfer __user *p;
1424 compat_uint_t n;
1425 compat_caddr_t addr;
1426
1427 p = compat_alloc_user_space(sizeof(*p));
1428
1429 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1430 get_user(n, &p32->len) || put_user(n, &p->len) ||
1431 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1432 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1433 return -EFAULT;
1434
1435 return proc_bulk(ps, p);
1436 }
1437 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1438 {
1439 struct usbdevfs_disconnectsignal32 ds;
1440
1441 if (copy_from_user(&ds, arg, sizeof(ds)))
1442 return -EFAULT;
1443 ps->discsignr = ds.signr;
1444 ps->disccontext = compat_ptr(ds.context);
1445 return 0;
1446 }
1447
1448 static int get_urb32(struct usbdevfs_urb *kurb,
1449 struct usbdevfs_urb32 __user *uurb)
1450 {
1451 __u32 uptr;
1452 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1453 __get_user(kurb->type, &uurb->type) ||
1454 __get_user(kurb->endpoint, &uurb->endpoint) ||
1455 __get_user(kurb->status, &uurb->status) ||
1456 __get_user(kurb->flags, &uurb->flags) ||
1457 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1458 __get_user(kurb->actual_length, &uurb->actual_length) ||
1459 __get_user(kurb->start_frame, &uurb->start_frame) ||
1460 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1461 __get_user(kurb->error_count, &uurb->error_count) ||
1462 __get_user(kurb->signr, &uurb->signr))
1463 return -EFAULT;
1464
1465 if (__get_user(uptr, &uurb->buffer))
1466 return -EFAULT;
1467 kurb->buffer = compat_ptr(uptr);
1468 if (__get_user(uptr, &uurb->usercontext))
1469 return -EFAULT;
1470 kurb->usercontext = compat_ptr(uptr);
1471
1472 return 0;
1473 }
1474
1475 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1476 {
1477 struct usbdevfs_urb uurb;
1478
1479 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1480 return -EFAULT;
1481
1482 return proc_do_submiturb(ps, &uurb,
1483 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1484 arg);
1485 }
1486
1487 static int processcompl_compat(struct async *as, void __user * __user *arg)
1488 {
1489 struct urb *urb = as->urb;
1490 struct usbdevfs_urb32 __user *userurb = as->userurb;
1491 void __user *addr = as->userurb;
1492 unsigned int i;
1493
1494 if (as->userbuffer && urb->actual_length)
1495 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1496 urb->actual_length))
1497 return -EFAULT;
1498 if (put_user(as->status, &userurb->status))
1499 return -EFAULT;
1500 if (put_user(urb->actual_length, &userurb->actual_length))
1501 return -EFAULT;
1502 if (put_user(urb->error_count, &userurb->error_count))
1503 return -EFAULT;
1504
1505 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1506 for (i = 0; i < urb->number_of_packets; i++) {
1507 if (put_user(urb->iso_frame_desc[i].actual_length,
1508 &userurb->iso_frame_desc[i].actual_length))
1509 return -EFAULT;
1510 if (put_user(urb->iso_frame_desc[i].status,
1511 &userurb->iso_frame_desc[i].status))
1512 return -EFAULT;
1513 }
1514 }
1515
1516 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1517 return -EFAULT;
1518 return 0;
1519 }
1520
1521 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1522 {
1523 struct async *as = reap_as(ps);
1524 if (as) {
1525 int retval = processcompl_compat(as, (void __user * __user *)arg);
1526 free_async(as);
1527 return retval;
1528 }
1529 if (signal_pending(current))
1530 return -EINTR;
1531 return -EIO;
1532 }
1533
1534 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1535 {
1536 int retval;
1537 struct async *as;
1538
1539 retval = -EAGAIN;
1540 as = async_getcompleted(ps);
1541 if (as) {
1542 retval = processcompl_compat(as, (void __user * __user *)arg);
1543 free_async(as);
1544 }
1545 return retval;
1546 }
1547
1548
1549 #endif
1550
1551 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1552 {
1553 struct usbdevfs_disconnectsignal ds;
1554
1555 if (copy_from_user(&ds, arg, sizeof(ds)))
1556 return -EFAULT;
1557 ps->discsignr = ds.signr;
1558 ps->disccontext = ds.context;
1559 return 0;
1560 }
1561
1562 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1563 {
1564 unsigned int ifnum;
1565
1566 if (get_user(ifnum, (unsigned int __user *)arg))
1567 return -EFAULT;
1568 return claimintf(ps, ifnum);
1569 }
1570
1571 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1572 {
1573 unsigned int ifnum;
1574 int ret;
1575
1576 if (get_user(ifnum, (unsigned int __user *)arg))
1577 return -EFAULT;
1578 if ((ret = releaseintf(ps, ifnum)) < 0)
1579 return ret;
1580 destroy_async_on_interface (ps, ifnum);
1581 return 0;
1582 }
1583
1584 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1585 {
1586 int size;
1587 void *buf = NULL;
1588 int retval = 0;
1589 struct usb_interface *intf = NULL;
1590 struct usb_driver *driver = NULL;
1591
1592 /* alloc buffer */
1593 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1594 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1595 return -ENOMEM;
1596 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1597 if (copy_from_user(buf, ctl->data, size)) {
1598 kfree(buf);
1599 return -EFAULT;
1600 }
1601 } else {
1602 memset(buf, 0, size);
1603 }
1604 }
1605
1606 if (!connected(ps)) {
1607 kfree(buf);
1608 return -ENODEV;
1609 }
1610
1611 if (ps->dev->state != USB_STATE_CONFIGURED)
1612 retval = -EHOSTUNREACH;
1613 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1614 retval = -EINVAL;
1615 else switch (ctl->ioctl_code) {
1616
1617 /* disconnect kernel driver from interface */
1618 case USBDEVFS_DISCONNECT:
1619 if (intf->dev.driver) {
1620 driver = to_usb_driver(intf->dev.driver);
1621 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1622 usb_driver_release_interface(driver, intf);
1623 } else
1624 retval = -ENODATA;
1625 break;
1626
1627 /* let kernel drivers try to (re)bind to the interface */
1628 case USBDEVFS_CONNECT:
1629 if (!intf->dev.driver)
1630 retval = device_attach(&intf->dev);
1631 else
1632 retval = -EBUSY;
1633 break;
1634
1635 /* talk directly to the interface's driver */
1636 default:
1637 if (intf->dev.driver)
1638 driver = to_usb_driver(intf->dev.driver);
1639 if (driver == NULL || driver->ioctl == NULL) {
1640 retval = -ENOTTY;
1641 } else {
1642 retval = driver->ioctl(intf, ctl->ioctl_code, buf);
1643 if (retval == -ENOIOCTLCMD)
1644 retval = -ENOTTY;
1645 }
1646 }
1647
1648 /* cleanup and return */
1649 if (retval >= 0
1650 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1651 && size > 0
1652 && copy_to_user(ctl->data, buf, size) != 0)
1653 retval = -EFAULT;
1654
1655 kfree(buf);
1656 return retval;
1657 }
1658
1659 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1660 {
1661 struct usbdevfs_ioctl ctrl;
1662
1663 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1664 return -EFAULT;
1665 return proc_ioctl(ps, &ctrl);
1666 }
1667
1668 #ifdef CONFIG_COMPAT
1669 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1670 {
1671 struct usbdevfs_ioctl32 __user *uioc;
1672 struct usbdevfs_ioctl ctrl;
1673 u32 udata;
1674
1675 uioc = compat_ptr((long)arg);
1676 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1677 __get_user(ctrl.ifno, &uioc->ifno) ||
1678 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1679 __get_user(udata, &uioc->data))
1680 return -EFAULT;
1681 ctrl.data = compat_ptr(udata);
1682
1683 return proc_ioctl(ps, &ctrl);
1684 }
1685 #endif
1686
1687 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1688 {
1689 unsigned portnum;
1690 int rc;
1691
1692 if (get_user(portnum, (unsigned __user *) arg))
1693 return -EFAULT;
1694 rc = usb_hub_claim_port(ps->dev, portnum, ps);
1695 if (rc == 0)
1696 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1697 portnum, task_pid_nr(current), current->comm);
1698 return rc;
1699 }
1700
1701 static int proc_release_port(struct dev_state *ps, void __user *arg)
1702 {
1703 unsigned portnum;
1704
1705 if (get_user(portnum, (unsigned __user *) arg))
1706 return -EFAULT;
1707 return usb_hub_release_port(ps->dev, portnum, ps);
1708 }
1709
1710 /*
1711 * NOTE: All requests here that have interface numbers as parameters
1712 * are assuming that somehow the configuration has been prevented from
1713 * changing. But there's no mechanism to ensure that...
1714 */
1715 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1716 void __user *p)
1717 {
1718 struct dev_state *ps = file->private_data;
1719 struct inode *inode = file->f_path.dentry->d_inode;
1720 struct usb_device *dev = ps->dev;
1721 int ret = -ENOTTY;
1722
1723 if (!(file->f_mode & FMODE_WRITE))
1724 return -EPERM;
1725 usb_lock_device(dev);
1726 if (!connected(ps)) {
1727 usb_unlock_device(dev);
1728 return -ENODEV;
1729 }
1730
1731 switch (cmd) {
1732 case USBDEVFS_CONTROL:
1733 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1734 ret = proc_control(ps, p);
1735 if (ret >= 0)
1736 inode->i_mtime = CURRENT_TIME;
1737 break;
1738
1739 case USBDEVFS_BULK:
1740 snoop(&dev->dev, "%s: BULK\n", __func__);
1741 ret = proc_bulk(ps, p);
1742 if (ret >= 0)
1743 inode->i_mtime = CURRENT_TIME;
1744 break;
1745
1746 case USBDEVFS_RESETEP:
1747 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1748 ret = proc_resetep(ps, p);
1749 if (ret >= 0)
1750 inode->i_mtime = CURRENT_TIME;
1751 break;
1752
1753 case USBDEVFS_RESET:
1754 snoop(&dev->dev, "%s: RESET\n", __func__);
1755 ret = proc_resetdevice(ps);
1756 break;
1757
1758 case USBDEVFS_CLEAR_HALT:
1759 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1760 ret = proc_clearhalt(ps, p);
1761 if (ret >= 0)
1762 inode->i_mtime = CURRENT_TIME;
1763 break;
1764
1765 case USBDEVFS_GETDRIVER:
1766 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1767 ret = proc_getdriver(ps, p);
1768 break;
1769
1770 case USBDEVFS_CONNECTINFO:
1771 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1772 ret = proc_connectinfo(ps, p);
1773 break;
1774
1775 case USBDEVFS_SETINTERFACE:
1776 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1777 ret = proc_setintf(ps, p);
1778 break;
1779
1780 case USBDEVFS_SETCONFIGURATION:
1781 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1782 ret = proc_setconfig(ps, p);
1783 break;
1784
1785 case USBDEVFS_SUBMITURB:
1786 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1787 ret = proc_submiturb(ps, p);
1788 if (ret >= 0)
1789 inode->i_mtime = CURRENT_TIME;
1790 break;
1791
1792 #ifdef CONFIG_COMPAT
1793 case USBDEVFS_CONTROL32:
1794 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
1795 ret = proc_control_compat(ps, p);
1796 if (ret >= 0)
1797 inode->i_mtime = CURRENT_TIME;
1798 break;
1799
1800 case USBDEVFS_BULK32:
1801 snoop(&dev->dev, "%s: BULK32\n", __func__);
1802 ret = proc_bulk_compat(ps, p);
1803 if (ret >= 0)
1804 inode->i_mtime = CURRENT_TIME;
1805 break;
1806
1807 case USBDEVFS_DISCSIGNAL32:
1808 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
1809 ret = proc_disconnectsignal_compat(ps, p);
1810 break;
1811
1812 case USBDEVFS_SUBMITURB32:
1813 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1814 ret = proc_submiturb_compat(ps, p);
1815 if (ret >= 0)
1816 inode->i_mtime = CURRENT_TIME;
1817 break;
1818
1819 case USBDEVFS_REAPURB32:
1820 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1821 ret = proc_reapurb_compat(ps, p);
1822 break;
1823
1824 case USBDEVFS_REAPURBNDELAY32:
1825 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
1826 ret = proc_reapurbnonblock_compat(ps, p);
1827 break;
1828
1829 case USBDEVFS_IOCTL32:
1830 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
1831 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1832 break;
1833 #endif
1834
1835 case USBDEVFS_DISCARDURB:
1836 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1837 ret = proc_unlinkurb(ps, p);
1838 break;
1839
1840 case USBDEVFS_REAPURB:
1841 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1842 ret = proc_reapurb(ps, p);
1843 break;
1844
1845 case USBDEVFS_REAPURBNDELAY:
1846 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
1847 ret = proc_reapurbnonblock(ps, p);
1848 break;
1849
1850 case USBDEVFS_DISCSIGNAL:
1851 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1852 ret = proc_disconnectsignal(ps, p);
1853 break;
1854
1855 case USBDEVFS_CLAIMINTERFACE:
1856 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1857 ret = proc_claiminterface(ps, p);
1858 break;
1859
1860 case USBDEVFS_RELEASEINTERFACE:
1861 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1862 ret = proc_releaseinterface(ps, p);
1863 break;
1864
1865 case USBDEVFS_IOCTL:
1866 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1867 ret = proc_ioctl_default(ps, p);
1868 break;
1869
1870 case USBDEVFS_CLAIM_PORT:
1871 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
1872 ret = proc_claim_port(ps, p);
1873 break;
1874
1875 case USBDEVFS_RELEASE_PORT:
1876 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
1877 ret = proc_release_port(ps, p);
1878 break;
1879 }
1880 usb_unlock_device(dev);
1881 if (ret >= 0)
1882 inode->i_atime = CURRENT_TIME;
1883 return ret;
1884 }
1885
1886 static long usbdev_ioctl(struct file *file, unsigned int cmd,
1887 unsigned long arg)
1888 {
1889 int ret;
1890
1891 lock_kernel();
1892 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
1893 unlock_kernel();
1894
1895 return ret;
1896 }
1897
1898 #ifdef CONFIG_COMPAT
1899 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
1900 unsigned long arg)
1901 {
1902 int ret;
1903
1904 lock_kernel();
1905 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
1906 unlock_kernel();
1907
1908 return ret;
1909 }
1910 #endif
1911
1912 /* No kernel lock - fine */
1913 static unsigned int usbdev_poll(struct file *file,
1914 struct poll_table_struct *wait)
1915 {
1916 struct dev_state *ps = file->private_data;
1917 unsigned int mask = 0;
1918
1919 poll_wait(file, &ps->wait, wait);
1920 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1921 mask |= POLLOUT | POLLWRNORM;
1922 if (!connected(ps))
1923 mask |= POLLERR | POLLHUP;
1924 return mask;
1925 }
1926
1927 const struct file_operations usbdev_file_operations = {
1928 .owner = THIS_MODULE,
1929 .llseek = usbdev_lseek,
1930 .read = usbdev_read,
1931 .poll = usbdev_poll,
1932 .unlocked_ioctl = usbdev_ioctl,
1933 #ifdef CONFIG_COMPAT
1934 .compat_ioctl = usbdev_compat_ioctl,
1935 #endif
1936 .open = usbdev_open,
1937 .release = usbdev_release,
1938 };
1939
1940 static void usbdev_remove(struct usb_device *udev)
1941 {
1942 struct dev_state *ps;
1943 struct siginfo sinfo;
1944
1945 while (!list_empty(&udev->filelist)) {
1946 ps = list_entry(udev->filelist.next, struct dev_state, list);
1947 destroy_all_async(ps);
1948 wake_up_all(&ps->wait);
1949 list_del_init(&ps->list);
1950 if (ps->discsignr) {
1951 sinfo.si_signo = ps->discsignr;
1952 sinfo.si_errno = EPIPE;
1953 sinfo.si_code = SI_ASYNCIO;
1954 sinfo.si_addr = ps->disccontext;
1955 kill_pid_info_as_uid(ps->discsignr, &sinfo,
1956 ps->disc_pid, ps->disc_uid,
1957 ps->disc_euid, ps->secid);
1958 }
1959 }
1960 }
1961
1962 #ifdef CONFIG_USB_DEVICE_CLASS
1963 static struct class *usb_classdev_class;
1964
1965 static int usb_classdev_add(struct usb_device *dev)
1966 {
1967 struct device *cldev;
1968
1969 cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
1970 NULL, "usbdev%d.%d", dev->bus->busnum,
1971 dev->devnum);
1972 if (IS_ERR(cldev))
1973 return PTR_ERR(cldev);
1974 dev->usb_classdev = cldev;
1975 return 0;
1976 }
1977
1978 static void usb_classdev_remove(struct usb_device *dev)
1979 {
1980 if (dev->usb_classdev)
1981 device_unregister(dev->usb_classdev);
1982 }
1983
1984 #else
1985 #define usb_classdev_add(dev) 0
1986 #define usb_classdev_remove(dev) do {} while (0)
1987
1988 #endif
1989
1990 static int usbdev_notify(struct notifier_block *self,
1991 unsigned long action, void *dev)
1992 {
1993 switch (action) {
1994 case USB_DEVICE_ADD:
1995 if (usb_classdev_add(dev))
1996 return NOTIFY_BAD;
1997 break;
1998 case USB_DEVICE_REMOVE:
1999 usb_classdev_remove(dev);
2000 usbdev_remove(dev);
2001 break;
2002 }
2003 return NOTIFY_OK;
2004 }
2005
2006 static struct notifier_block usbdev_nb = {
2007 .notifier_call = usbdev_notify,
2008 };
2009
2010 static struct cdev usb_device_cdev;
2011
2012 int __init usb_devio_init(void)
2013 {
2014 int retval;
2015
2016 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2017 "usb_device");
2018 if (retval) {
2019 printk(KERN_ERR "Unable to register minors for usb_device\n");
2020 goto out;
2021 }
2022 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2023 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2024 if (retval) {
2025 printk(KERN_ERR "Unable to get usb_device major %d\n",
2026 USB_DEVICE_MAJOR);
2027 goto error_cdev;
2028 }
2029 #ifdef CONFIG_USB_DEVICE_CLASS
2030 usb_classdev_class = class_create(THIS_MODULE, "usb_device");
2031 if (IS_ERR(usb_classdev_class)) {
2032 printk(KERN_ERR "Unable to register usb_device class\n");
2033 retval = PTR_ERR(usb_classdev_class);
2034 cdev_del(&usb_device_cdev);
2035 usb_classdev_class = NULL;
2036 goto out;
2037 }
2038 /* devices of this class shadow the major:minor of their parent
2039 * device, so clear ->dev_kobj to prevent adding duplicate entries
2040 * to /sys/dev
2041 */
2042 usb_classdev_class->dev_kobj = NULL;
2043 #endif
2044 usb_register_notify(&usbdev_nb);
2045 out:
2046 return retval;
2047
2048 error_cdev:
2049 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2050 goto out;
2051 }
2052
2053 void usb_devio_cleanup(void)
2054 {
2055 usb_unregister_notify(&usbdev_nb);
2056 #ifdef CONFIG_USB_DEVICE_CLASS
2057 class_destroy(usb_classdev_class);
2058 #endif
2059 cdev_del(&usb_device_cdev);
2060 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2061 }
WandBoard kernel