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Add linux-next specific files for 20110421
[linux-2.6/next.git] / drivers / usb / core / devio.c
blob37518dfdeb987188089eb43c3147417ce14615a9
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/signal.h>
41 #include <linux/poll.h>
42 #include <linux/module.h>
43 #include <linux/usb.h>
44 #include <linux/usbdevice_fs.h>
45 #include <linux/usb/hcd.h> /* for usbcore internals */
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 "usb.h"
54
55 #define USB_MAXBUS 64
56 #define USB_DEVICE_MAX USB_MAXBUS * 128
57
58 /* Mutual exclusion for removal, open, and release */
59 DEFINE_MUTEX(usbfs_mutex);
60
61 struct dev_state {
62 struct list_head list; /* state list */
63 struct usb_device *dev;
64 struct file *file;
65 spinlock_t lock; /* protects the async urb lists */
66 struct list_head async_pending;
67 struct list_head async_completed;
68 wait_queue_head_t wait; /* wake up if a request completed */
69 unsigned int discsignr;
70 struct pid *disc_pid;
71 uid_t disc_uid, disc_euid;
72 void __user *disccontext;
73 unsigned long ifclaimed;
74 u32 secid;
75 u32 disabled_bulk_eps;
76 };
77
78 struct async {
79 struct list_head asynclist;
80 struct dev_state *ps;
81 struct pid *pid;
82 uid_t uid, euid;
83 unsigned int signr;
84 unsigned int ifnum;
85 void __user *userbuffer;
86 void __user *userurb;
87 struct urb *urb;
88 int status;
89 u32 secid;
90 u8 bulk_addr;
91 u8 bulk_status;
92 };
93
94 static int usbfs_snoop;
95 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
96 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
97
98 #define snoop(dev, format, arg...) \
99 do { \
100 if (usbfs_snoop) \
101 dev_info(dev , format , ## arg); \
102 } while (0)
103
104 enum snoop_when {
105 SUBMIT, COMPLETE
106 };
107
108 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
109
110 #define MAX_USBFS_BUFFER_SIZE 16384
111
112
113 static int connected(struct dev_state *ps)
114 {
115 return (!list_empty(&ps->list) &&
116 ps->dev->state != USB_STATE_NOTATTACHED);
117 }
118
119 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
120 {
121 loff_t ret;
122
123 mutex_lock(&file->f_dentry->d_inode->i_mutex);
124
125 switch (orig) {
126 case 0:
127 file->f_pos = offset;
128 ret = file->f_pos;
129 break;
130 case 1:
131 file->f_pos += offset;
132 ret = file->f_pos;
133 break;
134 case 2:
135 default:
136 ret = -EINVAL;
137 }
138
139 mutex_unlock(&file->f_dentry->d_inode->i_mutex);
140 return ret;
141 }
142
143 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
144 loff_t *ppos)
145 {
146 struct dev_state *ps = file->private_data;
147 struct usb_device *dev = ps->dev;
148 ssize_t ret = 0;
149 unsigned len;
150 loff_t pos;
151 int i;
152
153 pos = *ppos;
154 usb_lock_device(dev);
155 if (!connected(ps)) {
156 ret = -ENODEV;
157 goto err;
158 } else if (pos < 0) {
159 ret = -EINVAL;
160 goto err;
161 }
162
163 if (pos < sizeof(struct usb_device_descriptor)) {
164 /* 18 bytes - fits on the stack */
165 struct usb_device_descriptor temp_desc;
166
167 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
168 le16_to_cpus(&temp_desc.bcdUSB);
169 le16_to_cpus(&temp_desc.idVendor);
170 le16_to_cpus(&temp_desc.idProduct);
171 le16_to_cpus(&temp_desc.bcdDevice);
172
173 len = sizeof(struct usb_device_descriptor) - pos;
174 if (len > nbytes)
175 len = nbytes;
176 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
177 ret = -EFAULT;
178 goto err;
179 }
180
181 *ppos += len;
182 buf += len;
183 nbytes -= len;
184 ret += len;
185 }
186
187 pos = sizeof(struct usb_device_descriptor);
188 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
189 struct usb_config_descriptor *config =
190 (struct usb_config_descriptor *)dev->rawdescriptors[i];
191 unsigned int length = le16_to_cpu(config->wTotalLength);
192
193 if (*ppos < pos + length) {
194
195 /* The descriptor may claim to be longer than it
196 * really is. Here is the actual allocated length. */
197 unsigned alloclen =
198 le16_to_cpu(dev->config[i].desc.wTotalLength);
199
200 len = length - (*ppos - pos);
201 if (len > nbytes)
202 len = nbytes;
203
204 /* Simply don't write (skip over) unallocated parts */
205 if (alloclen > (*ppos - pos)) {
206 alloclen -= (*ppos - pos);
207 if (copy_to_user(buf,
208 dev->rawdescriptors[i] + (*ppos - pos),
209 min(len, alloclen))) {
210 ret = -EFAULT;
211 goto err;
212 }
213 }
214
215 *ppos += len;
216 buf += len;
217 nbytes -= len;
218 ret += len;
219 }
220
221 pos += length;
222 }
223
224 err:
225 usb_unlock_device(dev);
226 return ret;
227 }
228
229 /*
230 * async list handling
231 */
232
233 static struct async *alloc_async(unsigned int numisoframes)
234 {
235 struct async *as;
236
237 as = kzalloc(sizeof(struct async), GFP_KERNEL);
238 if (!as)
239 return NULL;
240 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
241 if (!as->urb) {
242 kfree(as);
243 return NULL;
244 }
245 return as;
246 }
247
248 static void free_async(struct async *as)
249 {
250 put_pid(as->pid);
251 kfree(as->urb->transfer_buffer);
252 kfree(as->urb->setup_packet);
253 usb_free_urb(as->urb);
254 kfree(as);
255 }
256
257 static void async_newpending(struct async *as)
258 {
259 struct dev_state *ps = as->ps;
260 unsigned long flags;
261
262 spin_lock_irqsave(&ps->lock, flags);
263 list_add_tail(&as->asynclist, &ps->async_pending);
264 spin_unlock_irqrestore(&ps->lock, flags);
265 }
266
267 static void async_removepending(struct async *as)
268 {
269 struct dev_state *ps = as->ps;
270 unsigned long flags;
271
272 spin_lock_irqsave(&ps->lock, flags);
273 list_del_init(&as->asynclist);
274 spin_unlock_irqrestore(&ps->lock, flags);
275 }
276
277 static struct async *async_getcompleted(struct dev_state *ps)
278 {
279 unsigned long flags;
280 struct async *as = NULL;
281
282 spin_lock_irqsave(&ps->lock, flags);
283 if (!list_empty(&ps->async_completed)) {
284 as = list_entry(ps->async_completed.next, struct async,
285 asynclist);
286 list_del_init(&as->asynclist);
287 }
288 spin_unlock_irqrestore(&ps->lock, flags);
289 return as;
290 }
291
292 static struct async *async_getpending(struct dev_state *ps,
293 void __user *userurb)
294 {
295 unsigned long flags;
296 struct async *as;
297
298 spin_lock_irqsave(&ps->lock, flags);
299 list_for_each_entry(as, &ps->async_pending, asynclist)
300 if (as->userurb == userurb) {
301 list_del_init(&as->asynclist);
302 spin_unlock_irqrestore(&ps->lock, flags);
303 return as;
304 }
305 spin_unlock_irqrestore(&ps->lock, flags);
306 return NULL;
307 }
308
309 static void snoop_urb(struct usb_device *udev,
310 void __user *userurb, int pipe, unsigned length,
311 int timeout_or_status, enum snoop_when when,
312 unsigned char *data, unsigned data_len)
313 {
314 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
315 static const char *dirs[] = {"out", "in"};
316 int ep;
317 const char *t, *d;
318
319 if (!usbfs_snoop)
320 return;
321
322 ep = usb_pipeendpoint(pipe);
323 t = types[usb_pipetype(pipe)];
324 d = dirs[!!usb_pipein(pipe)];
325
326 if (userurb) { /* Async */
327 if (when == SUBMIT)
328 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
329 "length %u\n",
330 userurb, ep, t, d, length);
331 else
332 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
333 "actual_length %u status %d\n",
334 userurb, ep, t, d, length,
335 timeout_or_status);
336 } else {
337 if (when == SUBMIT)
338 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
339 "timeout %d\n",
340 ep, t, d, length, timeout_or_status);
341 else
342 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
343 "status %d\n",
344 ep, t, d, length, timeout_or_status);
345 }
346
347 if (data && data_len > 0) {
348 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
349 data, data_len, 1);
350 }
351 }
352
353 #define AS_CONTINUATION 1
354 #define AS_UNLINK 2
355
356 static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr)
357 __releases(ps->lock)
358 __acquires(ps->lock)
359 {
360 struct async *as;
361
362 /* Mark all the pending URBs that match bulk_addr, up to but not
363 * including the first one without AS_CONTINUATION. If such an
364 * URB is encountered then a new transfer has already started so
365 * the endpoint doesn't need to be disabled; otherwise it does.
366 */
367 list_for_each_entry(as, &ps->async_pending, asynclist) {
368 if (as->bulk_addr == bulk_addr) {
369 if (as->bulk_status != AS_CONTINUATION)
370 goto rescan;
371 as->bulk_status = AS_UNLINK;
372 as->bulk_addr = 0;
373 }
374 }
375 ps->disabled_bulk_eps |= (1 << bulk_addr);
376
377 /* Now carefully unlink all the marked pending URBs */
378 rescan:
379 list_for_each_entry(as, &ps->async_pending, asynclist) {
380 if (as->bulk_status == AS_UNLINK) {
381 as->bulk_status = 0; /* Only once */
382 spin_unlock(&ps->lock); /* Allow completions */
383 usb_unlink_urb(as->urb);
384 spin_lock(&ps->lock);
385 goto rescan;
386 }
387 }
388 }
389
390 static void async_completed(struct urb *urb)
391 {
392 struct async *as = urb->context;
393 struct dev_state *ps = as->ps;
394 struct siginfo sinfo;
395 struct pid *pid = NULL;
396 uid_t uid = 0;
397 uid_t euid = 0;
398 u32 secid = 0;
399 int signr;
400
401 spin_lock(&ps->lock);
402 list_move_tail(&as->asynclist, &ps->async_completed);
403 as->status = urb->status;
404 signr = as->signr;
405 if (signr) {
406 sinfo.si_signo = as->signr;
407 sinfo.si_errno = as->status;
408 sinfo.si_code = SI_ASYNCIO;
409 sinfo.si_addr = as->userurb;
410 pid = as->pid;
411 uid = as->uid;
412 euid = as->euid;
413 secid = as->secid;
414 }
415 snoop(&urb->dev->dev, "urb complete\n");
416 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
417 as->status, COMPLETE,
418 ((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_OUT) ?
419 NULL : urb->transfer_buffer, urb->actual_length);
420 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
421 as->status != -ENOENT)
422 cancel_bulk_urbs(ps, as->bulk_addr);
423 spin_unlock(&ps->lock);
424
425 if (signr)
426 kill_pid_info_as_uid(sinfo.si_signo, &sinfo, pid, uid,
427 euid, secid);
428
429 wake_up(&ps->wait);
430 }
431
432 static void destroy_async(struct dev_state *ps, struct list_head *list)
433 {
434 struct async *as;
435 unsigned long flags;
436
437 spin_lock_irqsave(&ps->lock, flags);
438 while (!list_empty(list)) {
439 as = list_entry(list->next, struct async, asynclist);
440 list_del_init(&as->asynclist);
441
442 /* drop the spinlock so the completion handler can run */
443 spin_unlock_irqrestore(&ps->lock, flags);
444 usb_kill_urb(as->urb);
445 spin_lock_irqsave(&ps->lock, flags);
446 }
447 spin_unlock_irqrestore(&ps->lock, flags);
448 }
449
450 static void destroy_async_on_interface(struct dev_state *ps,
451 unsigned int ifnum)
452 {
453 struct list_head *p, *q, hitlist;
454 unsigned long flags;
455
456 INIT_LIST_HEAD(&hitlist);
457 spin_lock_irqsave(&ps->lock, flags);
458 list_for_each_safe(p, q, &ps->async_pending)
459 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
460 list_move_tail(p, &hitlist);
461 spin_unlock_irqrestore(&ps->lock, flags);
462 destroy_async(ps, &hitlist);
463 }
464
465 static void destroy_all_async(struct dev_state *ps)
466 {
467 destroy_async(ps, &ps->async_pending);
468 }
469
470 /*
471 * interface claims are made only at the request of user level code,
472 * which can also release them (explicitly or by closing files).
473 * they're also undone when devices disconnect.
474 */
475
476 static int driver_probe(struct usb_interface *intf,
477 const struct usb_device_id *id)
478 {
479 return -ENODEV;
480 }
481
482 static void driver_disconnect(struct usb_interface *intf)
483 {
484 struct dev_state *ps = usb_get_intfdata(intf);
485 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
486
487 if (!ps)
488 return;
489
490 /* NOTE: this relies on usbcore having canceled and completed
491 * all pending I/O requests; 2.6 does that.
492 */
493
494 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
495 clear_bit(ifnum, &ps->ifclaimed);
496 else
497 dev_warn(&intf->dev, "interface number %u out of range\n",
498 ifnum);
499
500 usb_set_intfdata(intf, NULL);
501
502 /* force async requests to complete */
503 destroy_async_on_interface(ps, ifnum);
504 }
505
506 /* The following routines are merely placeholders. There is no way
507 * to inform a user task about suspend or resumes.
508 */
509 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
510 {
511 return 0;
512 }
513
514 static int driver_resume(struct usb_interface *intf)
515 {
516 return 0;
517 }
518
519 struct usb_driver usbfs_driver = {
520 .name = "usbfs",
521 .probe = driver_probe,
522 .disconnect = driver_disconnect,
523 .suspend = driver_suspend,
524 .resume = driver_resume,
525 };
526
527 static int claimintf(struct dev_state *ps, unsigned int ifnum)
528 {
529 struct usb_device *dev = ps->dev;
530 struct usb_interface *intf;
531 int err;
532
533 if (ifnum >= 8*sizeof(ps->ifclaimed))
534 return -EINVAL;
535 /* already claimed */
536 if (test_bit(ifnum, &ps->ifclaimed))
537 return 0;
538
539 intf = usb_ifnum_to_if(dev, ifnum);
540 if (!intf)
541 err = -ENOENT;
542 else
543 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
544 if (err == 0)
545 set_bit(ifnum, &ps->ifclaimed);
546 return err;
547 }
548
549 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
550 {
551 struct usb_device *dev;
552 struct usb_interface *intf;
553 int err;
554
555 err = -EINVAL;
556 if (ifnum >= 8*sizeof(ps->ifclaimed))
557 return err;
558 dev = ps->dev;
559 intf = usb_ifnum_to_if(dev, ifnum);
560 if (!intf)
561 err = -ENOENT;
562 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
563 usb_driver_release_interface(&usbfs_driver, intf);
564 err = 0;
565 }
566 return err;
567 }
568
569 static int checkintf(struct dev_state *ps, unsigned int ifnum)
570 {
571 if (ps->dev->state != USB_STATE_CONFIGURED)
572 return -EHOSTUNREACH;
573 if (ifnum >= 8*sizeof(ps->ifclaimed))
574 return -EINVAL;
575 if (test_bit(ifnum, &ps->ifclaimed))
576 return 0;
577 /* if not yet claimed, claim it for the driver */
578 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
579 "interface %u before use\n", task_pid_nr(current),
580 current->comm, ifnum);
581 return claimintf(ps, ifnum);
582 }
583
584 static int findintfep(struct usb_device *dev, unsigned int ep)
585 {
586 unsigned int i, j, e;
587 struct usb_interface *intf;
588 struct usb_host_interface *alts;
589 struct usb_endpoint_descriptor *endpt;
590
591 if (ep & ~(USB_DIR_IN|0xf))
592 return -EINVAL;
593 if (!dev->actconfig)
594 return -ESRCH;
595 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
596 intf = dev->actconfig->interface[i];
597 for (j = 0; j < intf->num_altsetting; j++) {
598 alts = &intf->altsetting[j];
599 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
600 endpt = &alts->endpoint[e].desc;
601 if (endpt->bEndpointAddress == ep)
602 return alts->desc.bInterfaceNumber;
603 }
604 }
605 }
606 return -ENOENT;
607 }
608
609 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
610 unsigned int index)
611 {
612 int ret = 0;
613
614 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
615 && ps->dev->state != USB_STATE_ADDRESS
616 && ps->dev->state != USB_STATE_CONFIGURED)
617 return -EHOSTUNREACH;
618 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
619 return 0;
620
621 index &= 0xff;
622 switch (requesttype & USB_RECIP_MASK) {
623 case USB_RECIP_ENDPOINT:
624 ret = findintfep(ps->dev, index);
625 if (ret >= 0)
626 ret = checkintf(ps, ret);
627 break;
628
629 case USB_RECIP_INTERFACE:
630 ret = checkintf(ps, index);
631 break;
632 }
633 return ret;
634 }
635
636 static int match_devt(struct device *dev, void *data)
637 {
638 return dev->devt == (dev_t) (unsigned long) data;
639 }
640
641 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
642 {
643 struct device *dev;
644
645 dev = bus_find_device(&usb_bus_type, NULL,
646 (void *) (unsigned long) devt, match_devt);
647 if (!dev)
648 return NULL;
649 return container_of(dev, struct usb_device, dev);
650 }
651
652 /*
653 * file operations
654 */
655 static int usbdev_open(struct inode *inode, struct file *file)
656 {
657 struct usb_device *dev = NULL;
658 struct dev_state *ps;
659 const struct cred *cred = current_cred();
660 int ret;
661
662 ret = -ENOMEM;
663 ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
664 if (!ps)
665 goto out_free_ps;
666
667 ret = -ENODEV;
668
669 /* Protect against simultaneous removal or release */
670 mutex_lock(&usbfs_mutex);
671
672 /* usbdev device-node */
673 if (imajor(inode) == USB_DEVICE_MAJOR)
674 dev = usbdev_lookup_by_devt(inode->i_rdev);
675
676 #ifdef CONFIG_USB_DEVICEFS
677 /* procfs file */
678 if (!dev) {
679 dev = inode->i_private;
680 if (dev && dev->usbfs_dentry &&
681 dev->usbfs_dentry->d_inode == inode)
682 usb_get_dev(dev);
683 else
684 dev = NULL;
685 }
686 #endif
687 mutex_unlock(&usbfs_mutex);
688
689 if (!dev)
690 goto out_free_ps;
691
692 usb_lock_device(dev);
693 if (dev->state == USB_STATE_NOTATTACHED)
694 goto out_unlock_device;
695
696 ret = usb_autoresume_device(dev);
697 if (ret)
698 goto out_unlock_device;
699
700 ps->dev = dev;
701 ps->file = file;
702 spin_lock_init(&ps->lock);
703 INIT_LIST_HEAD(&ps->list);
704 INIT_LIST_HEAD(&ps->async_pending);
705 INIT_LIST_HEAD(&ps->async_completed);
706 init_waitqueue_head(&ps->wait);
707 ps->discsignr = 0;
708 ps->disc_pid = get_pid(task_pid(current));
709 ps->disc_uid = cred->uid;
710 ps->disc_euid = cred->euid;
711 ps->disccontext = NULL;
712 ps->ifclaimed = 0;
713 security_task_getsecid(current, &ps->secid);
714 smp_wmb();
715 list_add_tail(&ps->list, &dev->filelist);
716 file->private_data = ps;
717 usb_unlock_device(dev);
718 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
719 current->comm);
720 return ret;
721
722 out_unlock_device:
723 usb_unlock_device(dev);
724 usb_put_dev(dev);
725 out_free_ps:
726 kfree(ps);
727 return ret;
728 }
729
730 static int usbdev_release(struct inode *inode, struct file *file)
731 {
732 struct dev_state *ps = file->private_data;
733 struct usb_device *dev = ps->dev;
734 unsigned int ifnum;
735 struct async *as;
736
737 usb_lock_device(dev);
738 usb_hub_release_all_ports(dev, ps);
739
740 list_del_init(&ps->list);
741
742 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
743 ifnum++) {
744 if (test_bit(ifnum, &ps->ifclaimed))
745 releaseintf(ps, ifnum);
746 }
747 destroy_all_async(ps);
748 usb_autosuspend_device(dev);
749 usb_unlock_device(dev);
750 usb_put_dev(dev);
751 put_pid(ps->disc_pid);
752
753 as = async_getcompleted(ps);
754 while (as) {
755 free_async(as);
756 as = async_getcompleted(ps);
757 }
758 kfree(ps);
759 return 0;
760 }
761
762 static int proc_control(struct dev_state *ps, void __user *arg)
763 {
764 struct usb_device *dev = ps->dev;
765 struct usbdevfs_ctrltransfer ctrl;
766 unsigned int tmo;
767 unsigned char *tbuf;
768 unsigned wLength;
769 int i, pipe, ret;
770
771 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
772 return -EFAULT;
773 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
774 if (ret)
775 return ret;
776 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
777 if (wLength > PAGE_SIZE)
778 return -EINVAL;
779 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
780 if (!tbuf)
781 return -ENOMEM;
782 tmo = ctrl.timeout;
783 snoop(&dev->dev, "control urb: bRequestType=%02x "
784 "bRequest=%02x wValue=%04x "
785 "wIndex=%04x wLength=%04x\n",
786 ctrl.bRequestType, ctrl.bRequest,
787 __le16_to_cpup(&ctrl.wValue),
788 __le16_to_cpup(&ctrl.wIndex),
789 __le16_to_cpup(&ctrl.wLength));
790 if (ctrl.bRequestType & 0x80) {
791 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
792 ctrl.wLength)) {
793 free_page((unsigned long)tbuf);
794 return -EINVAL;
795 }
796 pipe = usb_rcvctrlpipe(dev, 0);
797 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
798
799 usb_unlock_device(dev);
800 i = usb_control_msg(dev, pipe, ctrl.bRequest,
801 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
802 tbuf, ctrl.wLength, tmo);
803 usb_lock_device(dev);
804 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
805 tbuf, max(i, 0));
806 if ((i > 0) && ctrl.wLength) {
807 if (copy_to_user(ctrl.data, tbuf, i)) {
808 free_page((unsigned long)tbuf);
809 return -EFAULT;
810 }
811 }
812 } else {
813 if (ctrl.wLength) {
814 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
815 free_page((unsigned long)tbuf);
816 return -EFAULT;
817 }
818 }
819 pipe = usb_sndctrlpipe(dev, 0);
820 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
821 tbuf, ctrl.wLength);
822
823 usb_unlock_device(dev);
824 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
825 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
826 tbuf, ctrl.wLength, tmo);
827 usb_lock_device(dev);
828 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
829 }
830 free_page((unsigned long)tbuf);
831 if (i < 0 && i != -EPIPE) {
832 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
833 "failed cmd %s rqt %u rq %u len %u ret %d\n",
834 current->comm, ctrl.bRequestType, ctrl.bRequest,
835 ctrl.wLength, i);
836 }
837 return i;
838 }
839
840 static int proc_bulk(struct dev_state *ps, void __user *arg)
841 {
842 struct usb_device *dev = ps->dev;
843 struct usbdevfs_bulktransfer bulk;
844 unsigned int tmo, len1, pipe;
845 int len2;
846 unsigned char *tbuf;
847 int i, ret;
848
849 if (copy_from_user(&bulk, arg, sizeof(bulk)))
850 return -EFAULT;
851 ret = findintfep(ps->dev, bulk.ep);
852 if (ret < 0)
853 return ret;
854 ret = checkintf(ps, ret);
855 if (ret)
856 return ret;
857 if (bulk.ep & USB_DIR_IN)
858 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
859 else
860 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
861 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
862 return -EINVAL;
863 len1 = bulk.len;
864 if (len1 > MAX_USBFS_BUFFER_SIZE)
865 return -EINVAL;
866 if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
867 return -ENOMEM;
868 tmo = bulk.timeout;
869 if (bulk.ep & 0x80) {
870 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
871 kfree(tbuf);
872 return -EINVAL;
873 }
874 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
875
876 usb_unlock_device(dev);
877 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
878 usb_lock_device(dev);
879 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
880
881 if (!i && len2) {
882 if (copy_to_user(bulk.data, tbuf, len2)) {
883 kfree(tbuf);
884 return -EFAULT;
885 }
886 }
887 } else {
888 if (len1) {
889 if (copy_from_user(tbuf, bulk.data, len1)) {
890 kfree(tbuf);
891 return -EFAULT;
892 }
893 }
894 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
895
896 usb_unlock_device(dev);
897 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
898 usb_lock_device(dev);
899 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
900 }
901 kfree(tbuf);
902 if (i < 0)
903 return i;
904 return len2;
905 }
906
907 static int proc_resetep(struct dev_state *ps, void __user *arg)
908 {
909 unsigned int ep;
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 usb_reset_endpoint(ps->dev, ep);
921 return 0;
922 }
923
924 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
925 {
926 unsigned int ep;
927 int pipe;
928 int ret;
929
930 if (get_user(ep, (unsigned int __user *)arg))
931 return -EFAULT;
932 ret = findintfep(ps->dev, ep);
933 if (ret < 0)
934 return ret;
935 ret = checkintf(ps, ret);
936 if (ret)
937 return ret;
938 if (ep & USB_DIR_IN)
939 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
940 else
941 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
942
943 return usb_clear_halt(ps->dev, pipe);
944 }
945
946 static int proc_getdriver(struct dev_state *ps, void __user *arg)
947 {
948 struct usbdevfs_getdriver gd;
949 struct usb_interface *intf;
950 int ret;
951
952 if (copy_from_user(&gd, arg, sizeof(gd)))
953 return -EFAULT;
954 intf = usb_ifnum_to_if(ps->dev, gd.interface);
955 if (!intf || !intf->dev.driver)
956 ret = -ENODATA;
957 else {
958 strncpy(gd.driver, intf->dev.driver->name,
959 sizeof(gd.driver));
960 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
961 }
962 return ret;
963 }
964
965 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
966 {
967 struct usbdevfs_connectinfo ci = {
968 .devnum = ps->dev->devnum,
969 .slow = ps->dev->speed == USB_SPEED_LOW
970 };
971
972 if (copy_to_user(arg, &ci, sizeof(ci)))
973 return -EFAULT;
974 return 0;
975 }
976
977 static int proc_resetdevice(struct dev_state *ps)
978 {
979 return usb_reset_device(ps->dev);
980 }
981
982 static int proc_setintf(struct dev_state *ps, void __user *arg)
983 {
984 struct usbdevfs_setinterface setintf;
985 int ret;
986
987 if (copy_from_user(&setintf, arg, sizeof(setintf)))
988 return -EFAULT;
989 if ((ret = checkintf(ps, setintf.interface)))
990 return ret;
991 return usb_set_interface(ps->dev, setintf.interface,
992 setintf.altsetting);
993 }
994
995 static int proc_setconfig(struct dev_state *ps, void __user *arg)
996 {
997 int u;
998 int status = 0;
999 struct usb_host_config *actconfig;
1000
1001 if (get_user(u, (int __user *)arg))
1002 return -EFAULT;
1003
1004 actconfig = ps->dev->actconfig;
1005
1006 /* Don't touch the device if any interfaces are claimed.
1007 * It could interfere with other drivers' operations, and if
1008 * an interface is claimed by usbfs it could easily deadlock.
1009 */
1010 if (actconfig) {
1011 int i;
1012
1013 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1014 if (usb_interface_claimed(actconfig->interface[i])) {
1015 dev_warn(&ps->dev->dev,
1016 "usbfs: interface %d claimed by %s "
1017 "while '%s' sets config #%d\n",
1018 actconfig->interface[i]
1019 ->cur_altsetting
1020 ->desc.bInterfaceNumber,
1021 actconfig->interface[i]
1022 ->dev.driver->name,
1023 current->comm, u);
1024 status = -EBUSY;
1025 break;
1026 }
1027 }
1028 }
1029
1030 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1031 * so avoid usb_set_configuration()'s kick to sysfs
1032 */
1033 if (status == 0) {
1034 if (actconfig && actconfig->desc.bConfigurationValue == u)
1035 status = usb_reset_configuration(ps->dev);
1036 else
1037 status = usb_set_configuration(ps->dev, u);
1038 }
1039
1040 return status;
1041 }
1042
1043 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1044 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1045 void __user *arg)
1046 {
1047 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1048 struct usb_host_endpoint *ep;
1049 struct async *as;
1050 struct usb_ctrlrequest *dr = NULL;
1051 const struct cred *cred = current_cred();
1052 unsigned int u, totlen, isofrmlen;
1053 int ret, ifnum = -1;
1054 int is_in;
1055
1056 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1057 USBDEVFS_URB_SHORT_NOT_OK |
1058 USBDEVFS_URB_BULK_CONTINUATION |
1059 USBDEVFS_URB_NO_FSBR |
1060 USBDEVFS_URB_ZERO_PACKET |
1061 USBDEVFS_URB_NO_INTERRUPT))
1062 return -EINVAL;
1063 if (uurb->buffer_length > 0 && !uurb->buffer)
1064 return -EINVAL;
1065 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1066 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1067 ifnum = findintfep(ps->dev, uurb->endpoint);
1068 if (ifnum < 0)
1069 return ifnum;
1070 ret = checkintf(ps, ifnum);
1071 if (ret)
1072 return ret;
1073 }
1074 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1075 is_in = 1;
1076 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1077 } else {
1078 is_in = 0;
1079 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1080 }
1081 if (!ep)
1082 return -ENOENT;
1083 switch(uurb->type) {
1084 case USBDEVFS_URB_TYPE_CONTROL:
1085 if (!usb_endpoint_xfer_control(&ep->desc))
1086 return -EINVAL;
1087 /* min 8 byte setup packet,
1088 * max 8 byte setup plus an arbitrary data stage */
1089 if (uurb->buffer_length < 8 ||
1090 uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1091 return -EINVAL;
1092 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1093 if (!dr)
1094 return -ENOMEM;
1095 if (copy_from_user(dr, uurb->buffer, 8)) {
1096 kfree(dr);
1097 return -EFAULT;
1098 }
1099 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1100 kfree(dr);
1101 return -EINVAL;
1102 }
1103 ret = check_ctrlrecip(ps, dr->bRequestType,
1104 le16_to_cpup(&dr->wIndex));
1105 if (ret) {
1106 kfree(dr);
1107 return ret;
1108 }
1109 uurb->number_of_packets = 0;
1110 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1111 uurb->buffer += 8;
1112 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1113 is_in = 1;
1114 uurb->endpoint |= USB_DIR_IN;
1115 } else {
1116 is_in = 0;
1117 uurb->endpoint &= ~USB_DIR_IN;
1118 }
1119 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1120 "bRequest=%02x wValue=%04x "
1121 "wIndex=%04x wLength=%04x\n",
1122 dr->bRequestType, dr->bRequest,
1123 __le16_to_cpup(&dr->wValue),
1124 __le16_to_cpup(&dr->wIndex),
1125 __le16_to_cpup(&dr->wLength));
1126 break;
1127
1128 case USBDEVFS_URB_TYPE_BULK:
1129 switch (usb_endpoint_type(&ep->desc)) {
1130 case USB_ENDPOINT_XFER_CONTROL:
1131 case USB_ENDPOINT_XFER_ISOC:
1132 return -EINVAL;
1133 case USB_ENDPOINT_XFER_INT:
1134 /* allow single-shot interrupt transfers */
1135 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1136 goto interrupt_urb;
1137 }
1138 uurb->number_of_packets = 0;
1139 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1140 return -EINVAL;
1141 break;
1142
1143 case USBDEVFS_URB_TYPE_INTERRUPT:
1144 if (!usb_endpoint_xfer_int(&ep->desc))
1145 return -EINVAL;
1146 interrupt_urb:
1147 uurb->number_of_packets = 0;
1148 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1149 return -EINVAL;
1150 break;
1151
1152 case USBDEVFS_URB_TYPE_ISO:
1153 /* arbitrary limit */
1154 if (uurb->number_of_packets < 1 ||
1155 uurb->number_of_packets > 128)
1156 return -EINVAL;
1157 if (!usb_endpoint_xfer_isoc(&ep->desc))
1158 return -EINVAL;
1159 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1160 uurb->number_of_packets;
1161 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1162 return -ENOMEM;
1163 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1164 kfree(isopkt);
1165 return -EFAULT;
1166 }
1167 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1168 /* arbitrary limit,
1169 * sufficient for USB 2.0 high-bandwidth iso */
1170 if (isopkt[u].length > 8192) {
1171 kfree(isopkt);
1172 return -EINVAL;
1173 }
1174 totlen += isopkt[u].length;
1175 }
1176 /* 3072 * 64 microframes */
1177 if (totlen > 196608) {
1178 kfree(isopkt);
1179 return -EINVAL;
1180 }
1181 uurb->buffer_length = totlen;
1182 break;
1183
1184 default:
1185 return -EINVAL;
1186 }
1187 if (uurb->buffer_length > 0 &&
1188 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1189 uurb->buffer, uurb->buffer_length)) {
1190 kfree(isopkt);
1191 kfree(dr);
1192 return -EFAULT;
1193 }
1194 as = alloc_async(uurb->number_of_packets);
1195 if (!as) {
1196 kfree(isopkt);
1197 kfree(dr);
1198 return -ENOMEM;
1199 }
1200 if (uurb->buffer_length > 0) {
1201 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1202 GFP_KERNEL);
1203 if (!as->urb->transfer_buffer) {
1204 kfree(isopkt);
1205 kfree(dr);
1206 free_async(as);
1207 return -ENOMEM;
1208 }
1209 /* Isochronous input data may end up being discontiguous
1210 * if some of the packets are short. Clear the buffer so
1211 * that the gaps don't leak kernel data to userspace.
1212 */
1213 if (is_in && uurb->type == USBDEVFS_URB_TYPE_ISO)
1214 memset(as->urb->transfer_buffer, 0,
1215 uurb->buffer_length);
1216 }
1217 as->urb->dev = ps->dev;
1218 as->urb->pipe = (uurb->type << 30) |
1219 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1220 (uurb->endpoint & USB_DIR_IN);
1221
1222 /* This tedious sequence is necessary because the URB_* flags
1223 * are internal to the kernel and subject to change, whereas
1224 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1225 */
1226 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1227 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1228 u |= URB_ISO_ASAP;
1229 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1230 u |= URB_SHORT_NOT_OK;
1231 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1232 u |= URB_NO_FSBR;
1233 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1234 u |= URB_ZERO_PACKET;
1235 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1236 u |= URB_NO_INTERRUPT;
1237 as->urb->transfer_flags = u;
1238
1239 as->urb->transfer_buffer_length = uurb->buffer_length;
1240 as->urb->setup_packet = (unsigned char *)dr;
1241 as->urb->start_frame = uurb->start_frame;
1242 as->urb->number_of_packets = uurb->number_of_packets;
1243 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1244 ps->dev->speed == USB_SPEED_HIGH)
1245 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1246 else
1247 as->urb->interval = ep->desc.bInterval;
1248 as->urb->context = as;
1249 as->urb->complete = async_completed;
1250 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1251 as->urb->iso_frame_desc[u].offset = totlen;
1252 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1253 totlen += isopkt[u].length;
1254 }
1255 kfree(isopkt);
1256 as->ps = ps;
1257 as->userurb = arg;
1258 if (is_in && uurb->buffer_length > 0)
1259 as->userbuffer = uurb->buffer;
1260 else
1261 as->userbuffer = NULL;
1262 as->signr = uurb->signr;
1263 as->ifnum = ifnum;
1264 as->pid = get_pid(task_pid(current));
1265 as->uid = cred->uid;
1266 as->euid = cred->euid;
1267 security_task_getsecid(current, &as->secid);
1268 if (!is_in && uurb->buffer_length > 0) {
1269 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1270 uurb->buffer_length)) {
1271 free_async(as);
1272 return -EFAULT;
1273 }
1274 }
1275 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1276 as->urb->transfer_buffer_length, 0, SUBMIT,
1277 is_in ? NULL : as->urb->transfer_buffer,
1278 uurb->buffer_length);
1279 async_newpending(as);
1280
1281 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1282 spin_lock_irq(&ps->lock);
1283
1284 /* Not exactly the endpoint address; the direction bit is
1285 * shifted to the 0x10 position so that the value will be
1286 * between 0 and 31.
1287 */
1288 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1289 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1290 >> 3);
1291
1292 /* If this bulk URB is the start of a new transfer, re-enable
1293 * the endpoint. Otherwise mark it as a continuation URB.
1294 */
1295 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1296 as->bulk_status = AS_CONTINUATION;
1297 else
1298 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1299
1300 /* Don't accept continuation URBs if the endpoint is
1301 * disabled because of an earlier error.
1302 */
1303 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1304 ret = -EREMOTEIO;
1305 else
1306 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1307 spin_unlock_irq(&ps->lock);
1308 } else {
1309 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1310 }
1311
1312 if (ret) {
1313 dev_printk(KERN_DEBUG, &ps->dev->dev,
1314 "usbfs: usb_submit_urb returned %d\n", ret);
1315 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1316 0, ret, COMPLETE, NULL, 0);
1317 async_removepending(as);
1318 free_async(as);
1319 return ret;
1320 }
1321 return 0;
1322 }
1323
1324 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1325 {
1326 struct usbdevfs_urb uurb;
1327
1328 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1329 return -EFAULT;
1330
1331 return proc_do_submiturb(ps, &uurb,
1332 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1333 arg);
1334 }
1335
1336 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1337 {
1338 struct async *as;
1339
1340 as = async_getpending(ps, arg);
1341 if (!as)
1342 return -EINVAL;
1343 usb_kill_urb(as->urb);
1344 return 0;
1345 }
1346
1347 static int processcompl(struct async *as, void __user * __user *arg)
1348 {
1349 struct urb *urb = as->urb;
1350 struct usbdevfs_urb __user *userurb = as->userurb;
1351 void __user *addr = as->userurb;
1352 unsigned int i;
1353
1354 if (as->userbuffer && urb->actual_length) {
1355 if (urb->number_of_packets > 0) /* Isochronous */
1356 i = urb->transfer_buffer_length;
1357 else /* Non-Isoc */
1358 i = urb->actual_length;
1359 if (copy_to_user(as->userbuffer, urb->transfer_buffer, i))
1360 goto err_out;
1361 }
1362 if (put_user(as->status, &userurb->status))
1363 goto err_out;
1364 if (put_user(urb->actual_length, &userurb->actual_length))
1365 goto err_out;
1366 if (put_user(urb->error_count, &userurb->error_count))
1367 goto err_out;
1368
1369 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1370 for (i = 0; i < urb->number_of_packets; i++) {
1371 if (put_user(urb->iso_frame_desc[i].actual_length,
1372 &userurb->iso_frame_desc[i].actual_length))
1373 goto err_out;
1374 if (put_user(urb->iso_frame_desc[i].status,
1375 &userurb->iso_frame_desc[i].status))
1376 goto err_out;
1377 }
1378 }
1379
1380 if (put_user(addr, (void __user * __user *)arg))
1381 return -EFAULT;
1382 return 0;
1383
1384 err_out:
1385 return -EFAULT;
1386 }
1387
1388 static struct async *reap_as(struct dev_state *ps)
1389 {
1390 DECLARE_WAITQUEUE(wait, current);
1391 struct async *as = NULL;
1392 struct usb_device *dev = ps->dev;
1393
1394 add_wait_queue(&ps->wait, &wait);
1395 for (;;) {
1396 __set_current_state(TASK_INTERRUPTIBLE);
1397 as = async_getcompleted(ps);
1398 if (as)
1399 break;
1400 if (signal_pending(current))
1401 break;
1402 usb_unlock_device(dev);
1403 schedule();
1404 usb_lock_device(dev);
1405 }
1406 remove_wait_queue(&ps->wait, &wait);
1407 set_current_state(TASK_RUNNING);
1408 return as;
1409 }
1410
1411 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1412 {
1413 struct async *as = reap_as(ps);
1414 if (as) {
1415 int retval = processcompl(as, (void __user * __user *)arg);
1416 free_async(as);
1417 return retval;
1418 }
1419 if (signal_pending(current))
1420 return -EINTR;
1421 return -EIO;
1422 }
1423
1424 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1425 {
1426 int retval;
1427 struct async *as;
1428
1429 as = async_getcompleted(ps);
1430 retval = -EAGAIN;
1431 if (as) {
1432 retval = processcompl(as, (void __user * __user *)arg);
1433 free_async(as);
1434 }
1435 return retval;
1436 }
1437
1438 #ifdef CONFIG_COMPAT
1439 static int proc_control_compat(struct dev_state *ps,
1440 struct usbdevfs_ctrltransfer32 __user *p32)
1441 {
1442 struct usbdevfs_ctrltransfer __user *p;
1443 __u32 udata;
1444 p = compat_alloc_user_space(sizeof(*p));
1445 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1446 get_user(udata, &p32->data) ||
1447 put_user(compat_ptr(udata), &p->data))
1448 return -EFAULT;
1449 return proc_control(ps, p);
1450 }
1451
1452 static int proc_bulk_compat(struct dev_state *ps,
1453 struct usbdevfs_bulktransfer32 __user *p32)
1454 {
1455 struct usbdevfs_bulktransfer __user *p;
1456 compat_uint_t n;
1457 compat_caddr_t addr;
1458
1459 p = compat_alloc_user_space(sizeof(*p));
1460
1461 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1462 get_user(n, &p32->len) || put_user(n, &p->len) ||
1463 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1464 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1465 return -EFAULT;
1466
1467 return proc_bulk(ps, p);
1468 }
1469 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1470 {
1471 struct usbdevfs_disconnectsignal32 ds;
1472
1473 if (copy_from_user(&ds, arg, sizeof(ds)))
1474 return -EFAULT;
1475 ps->discsignr = ds.signr;
1476 ps->disccontext = compat_ptr(ds.context);
1477 return 0;
1478 }
1479
1480 static int get_urb32(struct usbdevfs_urb *kurb,
1481 struct usbdevfs_urb32 __user *uurb)
1482 {
1483 __u32 uptr;
1484 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1485 __get_user(kurb->type, &uurb->type) ||
1486 __get_user(kurb->endpoint, &uurb->endpoint) ||
1487 __get_user(kurb->status, &uurb->status) ||
1488 __get_user(kurb->flags, &uurb->flags) ||
1489 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1490 __get_user(kurb->actual_length, &uurb->actual_length) ||
1491 __get_user(kurb->start_frame, &uurb->start_frame) ||
1492 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1493 __get_user(kurb->error_count, &uurb->error_count) ||
1494 __get_user(kurb->signr, &uurb->signr))
1495 return -EFAULT;
1496
1497 if (__get_user(uptr, &uurb->buffer))
1498 return -EFAULT;
1499 kurb->buffer = compat_ptr(uptr);
1500 if (__get_user(uptr, &uurb->usercontext))
1501 return -EFAULT;
1502 kurb->usercontext = compat_ptr(uptr);
1503
1504 return 0;
1505 }
1506
1507 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1508 {
1509 struct usbdevfs_urb uurb;
1510
1511 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1512 return -EFAULT;
1513
1514 return proc_do_submiturb(ps, &uurb,
1515 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1516 arg);
1517 }
1518
1519 static int processcompl_compat(struct async *as, void __user * __user *arg)
1520 {
1521 struct urb *urb = as->urb;
1522 struct usbdevfs_urb32 __user *userurb = as->userurb;
1523 void __user *addr = as->userurb;
1524 unsigned int i;
1525
1526 if (as->userbuffer && urb->actual_length)
1527 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1528 urb->actual_length))
1529 return -EFAULT;
1530 if (put_user(as->status, &userurb->status))
1531 return -EFAULT;
1532 if (put_user(urb->actual_length, &userurb->actual_length))
1533 return -EFAULT;
1534 if (put_user(urb->error_count, &userurb->error_count))
1535 return -EFAULT;
1536
1537 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1538 for (i = 0; i < urb->number_of_packets; i++) {
1539 if (put_user(urb->iso_frame_desc[i].actual_length,
1540 &userurb->iso_frame_desc[i].actual_length))
1541 return -EFAULT;
1542 if (put_user(urb->iso_frame_desc[i].status,
1543 &userurb->iso_frame_desc[i].status))
1544 return -EFAULT;
1545 }
1546 }
1547
1548 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1549 return -EFAULT;
1550 return 0;
1551 }
1552
1553 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1554 {
1555 struct async *as = reap_as(ps);
1556 if (as) {
1557 int retval = processcompl_compat(as, (void __user * __user *)arg);
1558 free_async(as);
1559 return retval;
1560 }
1561 if (signal_pending(current))
1562 return -EINTR;
1563 return -EIO;
1564 }
1565
1566 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1567 {
1568 int retval;
1569 struct async *as;
1570
1571 retval = -EAGAIN;
1572 as = async_getcompleted(ps);
1573 if (as) {
1574 retval = processcompl_compat(as, (void __user * __user *)arg);
1575 free_async(as);
1576 }
1577 return retval;
1578 }
1579
1580
1581 #endif
1582
1583 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1584 {
1585 struct usbdevfs_disconnectsignal ds;
1586
1587 if (copy_from_user(&ds, arg, sizeof(ds)))
1588 return -EFAULT;
1589 ps->discsignr = ds.signr;
1590 ps->disccontext = ds.context;
1591 return 0;
1592 }
1593
1594 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1595 {
1596 unsigned int ifnum;
1597
1598 if (get_user(ifnum, (unsigned int __user *)arg))
1599 return -EFAULT;
1600 return claimintf(ps, ifnum);
1601 }
1602
1603 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1604 {
1605 unsigned int ifnum;
1606 int ret;
1607
1608 if (get_user(ifnum, (unsigned int __user *)arg))
1609 return -EFAULT;
1610 if ((ret = releaseintf(ps, ifnum)) < 0)
1611 return ret;
1612 destroy_async_on_interface (ps, ifnum);
1613 return 0;
1614 }
1615
1616 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1617 {
1618 int size;
1619 void *buf = NULL;
1620 int retval = 0;
1621 struct usb_interface *intf = NULL;
1622 struct usb_driver *driver = NULL;
1623
1624 /* alloc buffer */
1625 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1626 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1627 return -ENOMEM;
1628 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1629 if (copy_from_user(buf, ctl->data, size)) {
1630 kfree(buf);
1631 return -EFAULT;
1632 }
1633 } else {
1634 memset(buf, 0, size);
1635 }
1636 }
1637
1638 if (!connected(ps)) {
1639 kfree(buf);
1640 return -ENODEV;
1641 }
1642
1643 if (ps->dev->state != USB_STATE_CONFIGURED)
1644 retval = -EHOSTUNREACH;
1645 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1646 retval = -EINVAL;
1647 else switch (ctl->ioctl_code) {
1648
1649 /* disconnect kernel driver from interface */
1650 case USBDEVFS_DISCONNECT:
1651 if (intf->dev.driver) {
1652 driver = to_usb_driver(intf->dev.driver);
1653 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1654 usb_driver_release_interface(driver, intf);
1655 } else
1656 retval = -ENODATA;
1657 break;
1658
1659 /* let kernel drivers try to (re)bind to the interface */
1660 case USBDEVFS_CONNECT:
1661 if (!intf->dev.driver)
1662 retval = device_attach(&intf->dev);
1663 else
1664 retval = -EBUSY;
1665 break;
1666
1667 /* talk directly to the interface's driver */
1668 default:
1669 if (intf->dev.driver)
1670 driver = to_usb_driver(intf->dev.driver);
1671 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1672 retval = -ENOTTY;
1673 } else {
1674 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1675 if (retval == -ENOIOCTLCMD)
1676 retval = -ENOTTY;
1677 }
1678 }
1679
1680 /* cleanup and return */
1681 if (retval >= 0
1682 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1683 && size > 0
1684 && copy_to_user(ctl->data, buf, size) != 0)
1685 retval = -EFAULT;
1686
1687 kfree(buf);
1688 return retval;
1689 }
1690
1691 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1692 {
1693 struct usbdevfs_ioctl ctrl;
1694
1695 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1696 return -EFAULT;
1697 return proc_ioctl(ps, &ctrl);
1698 }
1699
1700 #ifdef CONFIG_COMPAT
1701 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1702 {
1703 struct usbdevfs_ioctl32 __user *uioc;
1704 struct usbdevfs_ioctl ctrl;
1705 u32 udata;
1706
1707 uioc = compat_ptr((long)arg);
1708 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1709 __get_user(ctrl.ifno, &uioc->ifno) ||
1710 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1711 __get_user(udata, &uioc->data))
1712 return -EFAULT;
1713 ctrl.data = compat_ptr(udata);
1714
1715 return proc_ioctl(ps, &ctrl);
1716 }
1717 #endif
1718
1719 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1720 {
1721 unsigned portnum;
1722 int rc;
1723
1724 if (get_user(portnum, (unsigned __user *) arg))
1725 return -EFAULT;
1726 rc = usb_hub_claim_port(ps->dev, portnum, ps);
1727 if (rc == 0)
1728 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1729 portnum, task_pid_nr(current), current->comm);
1730 return rc;
1731 }
1732
1733 static int proc_release_port(struct dev_state *ps, void __user *arg)
1734 {
1735 unsigned portnum;
1736
1737 if (get_user(portnum, (unsigned __user *) arg))
1738 return -EFAULT;
1739 return usb_hub_release_port(ps->dev, portnum, ps);
1740 }
1741
1742 /*
1743 * NOTE: All requests here that have interface numbers as parameters
1744 * are assuming that somehow the configuration has been prevented from
1745 * changing. But there's no mechanism to ensure that...
1746 */
1747 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1748 void __user *p)
1749 {
1750 struct dev_state *ps = file->private_data;
1751 struct inode *inode = file->f_path.dentry->d_inode;
1752 struct usb_device *dev = ps->dev;
1753 int ret = -ENOTTY;
1754
1755 if (!(file->f_mode & FMODE_WRITE))
1756 return -EPERM;
1757
1758 usb_lock_device(dev);
1759 if (!connected(ps)) {
1760 usb_unlock_device(dev);
1761 return -ENODEV;
1762 }
1763
1764 switch (cmd) {
1765 case USBDEVFS_CONTROL:
1766 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1767 ret = proc_control(ps, p);
1768 if (ret >= 0)
1769 inode->i_mtime = CURRENT_TIME;
1770 break;
1771
1772 case USBDEVFS_BULK:
1773 snoop(&dev->dev, "%s: BULK\n", __func__);
1774 ret = proc_bulk(ps, p);
1775 if (ret >= 0)
1776 inode->i_mtime = CURRENT_TIME;
1777 break;
1778
1779 case USBDEVFS_RESETEP:
1780 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1781 ret = proc_resetep(ps, p);
1782 if (ret >= 0)
1783 inode->i_mtime = CURRENT_TIME;
1784 break;
1785
1786 case USBDEVFS_RESET:
1787 snoop(&dev->dev, "%s: RESET\n", __func__);
1788 ret = proc_resetdevice(ps);
1789 break;
1790
1791 case USBDEVFS_CLEAR_HALT:
1792 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1793 ret = proc_clearhalt(ps, p);
1794 if (ret >= 0)
1795 inode->i_mtime = CURRENT_TIME;
1796 break;
1797
1798 case USBDEVFS_GETDRIVER:
1799 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1800 ret = proc_getdriver(ps, p);
1801 break;
1802
1803 case USBDEVFS_CONNECTINFO:
1804 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1805 ret = proc_connectinfo(ps, p);
1806 break;
1807
1808 case USBDEVFS_SETINTERFACE:
1809 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1810 ret = proc_setintf(ps, p);
1811 break;
1812
1813 case USBDEVFS_SETCONFIGURATION:
1814 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1815 ret = proc_setconfig(ps, p);
1816 break;
1817
1818 case USBDEVFS_SUBMITURB:
1819 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1820 ret = proc_submiturb(ps, p);
1821 if (ret >= 0)
1822 inode->i_mtime = CURRENT_TIME;
1823 break;
1824
1825 #ifdef CONFIG_COMPAT
1826 case USBDEVFS_CONTROL32:
1827 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
1828 ret = proc_control_compat(ps, p);
1829 if (ret >= 0)
1830 inode->i_mtime = CURRENT_TIME;
1831 break;
1832
1833 case USBDEVFS_BULK32:
1834 snoop(&dev->dev, "%s: BULK32\n", __func__);
1835 ret = proc_bulk_compat(ps, p);
1836 if (ret >= 0)
1837 inode->i_mtime = CURRENT_TIME;
1838 break;
1839
1840 case USBDEVFS_DISCSIGNAL32:
1841 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
1842 ret = proc_disconnectsignal_compat(ps, p);
1843 break;
1844
1845 case USBDEVFS_SUBMITURB32:
1846 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1847 ret = proc_submiturb_compat(ps, p);
1848 if (ret >= 0)
1849 inode->i_mtime = CURRENT_TIME;
1850 break;
1851
1852 case USBDEVFS_REAPURB32:
1853 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1854 ret = proc_reapurb_compat(ps, p);
1855 break;
1856
1857 case USBDEVFS_REAPURBNDELAY32:
1858 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
1859 ret = proc_reapurbnonblock_compat(ps, p);
1860 break;
1861
1862 case USBDEVFS_IOCTL32:
1863 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
1864 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1865 break;
1866 #endif
1867
1868 case USBDEVFS_DISCARDURB:
1869 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1870 ret = proc_unlinkurb(ps, p);
1871 break;
1872
1873 case USBDEVFS_REAPURB:
1874 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1875 ret = proc_reapurb(ps, p);
1876 break;
1877
1878 case USBDEVFS_REAPURBNDELAY:
1879 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
1880 ret = proc_reapurbnonblock(ps, p);
1881 break;
1882
1883 case USBDEVFS_DISCSIGNAL:
1884 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1885 ret = proc_disconnectsignal(ps, p);
1886 break;
1887
1888 case USBDEVFS_CLAIMINTERFACE:
1889 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1890 ret = proc_claiminterface(ps, p);
1891 break;
1892
1893 case USBDEVFS_RELEASEINTERFACE:
1894 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1895 ret = proc_releaseinterface(ps, p);
1896 break;
1897
1898 case USBDEVFS_IOCTL:
1899 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1900 ret = proc_ioctl_default(ps, p);
1901 break;
1902
1903 case USBDEVFS_CLAIM_PORT:
1904 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
1905 ret = proc_claim_port(ps, p);
1906 break;
1907
1908 case USBDEVFS_RELEASE_PORT:
1909 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
1910 ret = proc_release_port(ps, p);
1911 break;
1912 }
1913 usb_unlock_device(dev);
1914 if (ret >= 0)
1915 inode->i_atime = CURRENT_TIME;
1916 return ret;
1917 }
1918
1919 static long usbdev_ioctl(struct file *file, unsigned int cmd,
1920 unsigned long arg)
1921 {
1922 int ret;
1923
1924 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
1925
1926 return ret;
1927 }
1928
1929 #ifdef CONFIG_COMPAT
1930 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
1931 unsigned long arg)
1932 {
1933 int ret;
1934
1935 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
1936
1937 return ret;
1938 }
1939 #endif
1940
1941 /* No kernel lock - fine */
1942 static unsigned int usbdev_poll(struct file *file,
1943 struct poll_table_struct *wait)
1944 {
1945 struct dev_state *ps = file->private_data;
1946 unsigned int mask = 0;
1947
1948 poll_wait(file, &ps->wait, wait);
1949 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1950 mask |= POLLOUT | POLLWRNORM;
1951 if (!connected(ps))
1952 mask |= POLLERR | POLLHUP;
1953 return mask;
1954 }
1955
1956 const struct file_operations usbdev_file_operations = {
1957 .owner = THIS_MODULE,
1958 .llseek = usbdev_lseek,
1959 .read = usbdev_read,
1960 .poll = usbdev_poll,
1961 .unlocked_ioctl = usbdev_ioctl,
1962 #ifdef CONFIG_COMPAT
1963 .compat_ioctl = usbdev_compat_ioctl,
1964 #endif
1965 .open = usbdev_open,
1966 .release = usbdev_release,
1967 };
1968
1969 static void usbdev_remove(struct usb_device *udev)
1970 {
1971 struct dev_state *ps;
1972 struct siginfo sinfo;
1973
1974 while (!list_empty(&udev->filelist)) {
1975 ps = list_entry(udev->filelist.next, struct dev_state, list);
1976 destroy_all_async(ps);
1977 wake_up_all(&ps->wait);
1978 list_del_init(&ps->list);
1979 if (ps->discsignr) {
1980 sinfo.si_signo = ps->discsignr;
1981 sinfo.si_errno = EPIPE;
1982 sinfo.si_code = SI_ASYNCIO;
1983 sinfo.si_addr = ps->disccontext;
1984 kill_pid_info_as_uid(ps->discsignr, &sinfo,
1985 ps->disc_pid, ps->disc_uid,
1986 ps->disc_euid, ps->secid);
1987 }
1988 }
1989 }
1990
1991 #ifdef CONFIG_USB_DEVICE_CLASS
1992 static struct class *usb_classdev_class;
1993
1994 static int usb_classdev_add(struct usb_device *dev)
1995 {
1996 struct device *cldev;
1997
1998 cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
1999 NULL, "usbdev%d.%d", dev->bus->busnum,
2000 dev->devnum);
2001 if (IS_ERR(cldev))
2002 return PTR_ERR(cldev);
2003 dev->usb_classdev = cldev;
2004 return 0;
2005 }
2006
2007 static void usb_classdev_remove(struct usb_device *dev)
2008 {
2009 if (dev->usb_classdev)
2010 device_unregister(dev->usb_classdev);
2011 }
2012
2013 #else
2014 #define usb_classdev_add(dev) 0
2015 #define usb_classdev_remove(dev) do {} while (0)
2016
2017 #endif
2018
2019 static int usbdev_notify(struct notifier_block *self,
2020 unsigned long action, void *dev)
2021 {
2022 switch (action) {
2023 case USB_DEVICE_ADD:
2024 if (usb_classdev_add(dev))
2025 return NOTIFY_BAD;
2026 break;
2027 case USB_DEVICE_REMOVE:
2028 usb_classdev_remove(dev);
2029 usbdev_remove(dev);
2030 break;
2031 }
2032 return NOTIFY_OK;
2033 }
2034
2035 static struct notifier_block usbdev_nb = {
2036 .notifier_call = usbdev_notify,
2037 };
2038
2039 static struct cdev usb_device_cdev;
2040
2041 int __init usb_devio_init(void)
2042 {
2043 int retval;
2044
2045 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2046 "usb_device");
2047 if (retval) {
2048 printk(KERN_ERR "Unable to register minors for usb_device\n");
2049 goto out;
2050 }
2051 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2052 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2053 if (retval) {
2054 printk(KERN_ERR "Unable to get usb_device major %d\n",
2055 USB_DEVICE_MAJOR);
2056 goto error_cdev;
2057 }
2058 #ifdef CONFIG_USB_DEVICE_CLASS
2059 usb_classdev_class = class_create(THIS_MODULE, "usb_device");
2060 if (IS_ERR(usb_classdev_class)) {
2061 printk(KERN_ERR "Unable to register usb_device class\n");
2062 retval = PTR_ERR(usb_classdev_class);
2063 cdev_del(&usb_device_cdev);
2064 usb_classdev_class = NULL;
2065 goto out;
2066 }
2067 /* devices of this class shadow the major:minor of their parent
2068 * device, so clear ->dev_kobj to prevent adding duplicate entries
2069 * to /sys/dev
2070 */
2071 usb_classdev_class->dev_kobj = NULL;
2072 #endif
2073 usb_register_notify(&usbdev_nb);
2074 out:
2075 return retval;
2076
2077 error_cdev:
2078 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2079 goto out;
2080 }
2081
2082 void usb_devio_cleanup(void)
2083 {
2084 usb_unregister_notify(&usbdev_nb);
2085 #ifdef CONFIG_USB_DEVICE_CLASS
2086 class_destroy(usb_classdev_class);
2087 #endif
2088 cdev_del(&usb_device_cdev);
2089 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2090 }
linux-next