Loading...
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 */
59DEFINE_MUTEX(usbfs_mutex);
60
61struct 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
78struct 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
94static int usbfs_snoop;
95module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
96MODULE_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
104enum 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
113static int connected(struct dev_state *ps)
114{
115 return (!list_empty(&ps->list) &&
116 ps->dev->state != USB_STATE_NOTATTACHED);
117}
118
119static 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
143static 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
224err:
225 usb_unlock_device(dev);
226 return ret;
227}
228
229/*
230 * async list handling
231 */
232
233static 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
248static 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
257static 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
267static 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
277static 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
292static 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
309static 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
356static 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
390static 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
432static 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
450static 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
465static 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
476static int driver_probe(struct usb_interface *intf,
477 const struct usb_device_id *id)
478{
479 return -ENODEV;
480}
481
482static 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 */
509static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
510{
511 return 0;
512}
513
514static int driver_resume(struct usb_interface *intf)
515{
516 return 0;
517}
518
519struct 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
527static 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
549static 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
569static 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
584static 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
609static 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
636static int match_devt(struct device *dev, void *data)
637{
638 return dev->devt == (dev_t) (unsigned long) data;
639}
640
641static 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 */
655static 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
730static 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
762static 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
840static 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
907static 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
924static 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
946static 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
965static 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
977static int proc_resetdevice(struct dev_state *ps)
978{
979 return usb_reset_device(ps->dev);
980}
981
982static 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
995static 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
1043static 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
1324static 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
1336static 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
1347static 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
1384err_out:
1385 return -EFAULT;
1386}
1387
1388static 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
1411static 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
1424static 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
1439static 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
1452static 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}
1469static 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
1480static 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
1507static 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
1519static 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
1553static 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
1566static 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
1583static 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
1594static 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
1603static 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
1616static 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
1691static 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
1701static 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
1719static 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
1733static 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 */
1747static 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
1919static 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
1930static 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 */
1942static 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
1956const 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
1969static 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
1992static struct class *usb_classdev_class;
1993
1994static 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
2007static 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
2019static 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
2035static struct notifier_block usbdev_nb = {
2036 .notifier_call = usbdev_notify,
2037};
2038
2039static struct cdev usb_device_cdev;
2040
2041int __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);
2074out:
2075 return retval;
2076
2077error_cdev:
2078 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2079 goto out;
2080}
2081
2082void 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}
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/string.h>
44#include <linux/usb.h>
45#include <linux/usbdevice_fs.h>
46#include <linux/usb/hcd.h> /* for usbcore internals */
47#include <linux/cdev.h>
48#include <linux/notifier.h>
49#include <linux/security.h>
50#include <linux/user_namespace.h>
51#include <linux/scatterlist.h>
52#include <linux/uaccess.h>
53#include <linux/dma-mapping.h>
54#include <asm/byteorder.h>
55#include <linux/moduleparam.h>
56
57#include "usb.h"
58
59#define USB_MAXBUS 64
60#define USB_DEVICE_MAX (USB_MAXBUS * 128)
61#define USB_SG_SIZE 16384 /* split-size for large txs */
62
63/* Mutual exclusion for removal, open, and release */
64DEFINE_MUTEX(usbfs_mutex);
65
66struct usb_dev_state {
67 struct list_head list; /* state list */
68 struct usb_device *dev;
69 struct file *file;
70 spinlock_t lock; /* protects the async urb lists */
71 struct list_head async_pending;
72 struct list_head async_completed;
73 struct list_head memory_list;
74 wait_queue_head_t wait; /* wake up if a request completed */
75 unsigned int discsignr;
76 struct pid *disc_pid;
77 const struct cred *cred;
78 void __user *disccontext;
79 unsigned long ifclaimed;
80 u32 secid;
81 u32 disabled_bulk_eps;
82 bool privileges_dropped;
83 unsigned long interface_allowed_mask;
84};
85
86struct usb_memory {
87 struct list_head memlist;
88 int vma_use_count;
89 int urb_use_count;
90 u32 size;
91 void *mem;
92 dma_addr_t dma_handle;
93 unsigned long vm_start;
94 struct usb_dev_state *ps;
95};
96
97struct async {
98 struct list_head asynclist;
99 struct usb_dev_state *ps;
100 struct pid *pid;
101 const struct cred *cred;
102 unsigned int signr;
103 unsigned int ifnum;
104 void __user *userbuffer;
105 void __user *userurb;
106 struct urb *urb;
107 struct usb_memory *usbm;
108 unsigned int mem_usage;
109 int status;
110 u32 secid;
111 u8 bulk_addr;
112 u8 bulk_status;
113};
114
115static bool usbfs_snoop;
116module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
117MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
118
119static unsigned usbfs_snoop_max = 65536;
120module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
121MODULE_PARM_DESC(usbfs_snoop_max,
122 "maximum number of bytes to print while snooping");
123
124#define snoop(dev, format, arg...) \
125 do { \
126 if (usbfs_snoop) \
127 dev_info(dev, format, ## arg); \
128 } while (0)
129
130enum snoop_when {
131 SUBMIT, COMPLETE
132};
133
134#define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
135
136/* Limit on the total amount of memory we can allocate for transfers */
137static unsigned usbfs_memory_mb = 16;
138module_param(usbfs_memory_mb, uint, 0644);
139MODULE_PARM_DESC(usbfs_memory_mb,
140 "maximum MB allowed for usbfs buffers (0 = no limit)");
141
142/* Hard limit, necessary to avoid arithmetic overflow */
143#define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
144
145static atomic_t usbfs_memory_usage; /* Total memory currently allocated */
146
147/* Check whether it's okay to allocate more memory for a transfer */
148static int usbfs_increase_memory_usage(unsigned amount)
149{
150 unsigned lim;
151
152 /*
153 * Convert usbfs_memory_mb to bytes, avoiding overflows.
154 * 0 means use the hard limit (effectively unlimited).
155 */
156 lim = ACCESS_ONCE(usbfs_memory_mb);
157 if (lim == 0 || lim > (USBFS_XFER_MAX >> 20))
158 lim = USBFS_XFER_MAX;
159 else
160 lim <<= 20;
161
162 atomic_add(amount, &usbfs_memory_usage);
163 if (atomic_read(&usbfs_memory_usage) <= lim)
164 return 0;
165 atomic_sub(amount, &usbfs_memory_usage);
166 return -ENOMEM;
167}
168
169/* Memory for a transfer is being deallocated */
170static void usbfs_decrease_memory_usage(unsigned amount)
171{
172 atomic_sub(amount, &usbfs_memory_usage);
173}
174
175static int connected(struct usb_dev_state *ps)
176{
177 return (!list_empty(&ps->list) &&
178 ps->dev->state != USB_STATE_NOTATTACHED);
179}
180
181static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
182{
183 struct usb_dev_state *ps = usbm->ps;
184 unsigned long flags;
185
186 spin_lock_irqsave(&ps->lock, flags);
187 --*count;
188 if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
189 list_del(&usbm->memlist);
190 spin_unlock_irqrestore(&ps->lock, flags);
191
192 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
193 usbm->dma_handle);
194 usbfs_decrease_memory_usage(
195 usbm->size + sizeof(struct usb_memory));
196 kfree(usbm);
197 } else {
198 spin_unlock_irqrestore(&ps->lock, flags);
199 }
200}
201
202static void usbdev_vm_open(struct vm_area_struct *vma)
203{
204 struct usb_memory *usbm = vma->vm_private_data;
205 unsigned long flags;
206
207 spin_lock_irqsave(&usbm->ps->lock, flags);
208 ++usbm->vma_use_count;
209 spin_unlock_irqrestore(&usbm->ps->lock, flags);
210}
211
212static void usbdev_vm_close(struct vm_area_struct *vma)
213{
214 struct usb_memory *usbm = vma->vm_private_data;
215
216 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
217}
218
219static struct vm_operations_struct usbdev_vm_ops = {
220 .open = usbdev_vm_open,
221 .close = usbdev_vm_close
222};
223
224static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
225{
226 struct usb_memory *usbm = NULL;
227 struct usb_dev_state *ps = file->private_data;
228 size_t size = vma->vm_end - vma->vm_start;
229 void *mem;
230 unsigned long flags;
231 dma_addr_t dma_handle;
232 int ret;
233
234 ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
235 if (ret)
236 goto error;
237
238 usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
239 if (!usbm) {
240 ret = -ENOMEM;
241 goto error_decrease_mem;
242 }
243
244 mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
245 &dma_handle);
246 if (!mem) {
247 ret = -ENOMEM;
248 goto error_free_usbm;
249 }
250
251 memset(mem, 0, size);
252
253 usbm->mem = mem;
254 usbm->dma_handle = dma_handle;
255 usbm->size = size;
256 usbm->ps = ps;
257 usbm->vm_start = vma->vm_start;
258 usbm->vma_use_count = 1;
259 INIT_LIST_HEAD(&usbm->memlist);
260
261 if (remap_pfn_range(vma, vma->vm_start,
262 virt_to_phys(usbm->mem) >> PAGE_SHIFT,
263 size, vma->vm_page_prot) < 0) {
264 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
265 return -EAGAIN;
266 }
267
268 vma->vm_flags |= VM_IO;
269 vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
270 vma->vm_ops = &usbdev_vm_ops;
271 vma->vm_private_data = usbm;
272
273 spin_lock_irqsave(&ps->lock, flags);
274 list_add_tail(&usbm->memlist, &ps->memory_list);
275 spin_unlock_irqrestore(&ps->lock, flags);
276
277 return 0;
278
279error_free_usbm:
280 kfree(usbm);
281error_decrease_mem:
282 usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
283error:
284 return ret;
285}
286
287static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
288 loff_t *ppos)
289{
290 struct usb_dev_state *ps = file->private_data;
291 struct usb_device *dev = ps->dev;
292 ssize_t ret = 0;
293 unsigned len;
294 loff_t pos;
295 int i;
296
297 pos = *ppos;
298 usb_lock_device(dev);
299 if (!connected(ps)) {
300 ret = -ENODEV;
301 goto err;
302 } else if (pos < 0) {
303 ret = -EINVAL;
304 goto err;
305 }
306
307 if (pos < sizeof(struct usb_device_descriptor)) {
308 /* 18 bytes - fits on the stack */
309 struct usb_device_descriptor temp_desc;
310
311 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
312 le16_to_cpus(&temp_desc.bcdUSB);
313 le16_to_cpus(&temp_desc.idVendor);
314 le16_to_cpus(&temp_desc.idProduct);
315 le16_to_cpus(&temp_desc.bcdDevice);
316
317 len = sizeof(struct usb_device_descriptor) - pos;
318 if (len > nbytes)
319 len = nbytes;
320 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
321 ret = -EFAULT;
322 goto err;
323 }
324
325 *ppos += len;
326 buf += len;
327 nbytes -= len;
328 ret += len;
329 }
330
331 pos = sizeof(struct usb_device_descriptor);
332 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
333 struct usb_config_descriptor *config =
334 (struct usb_config_descriptor *)dev->rawdescriptors[i];
335 unsigned int length = le16_to_cpu(config->wTotalLength);
336
337 if (*ppos < pos + length) {
338
339 /* The descriptor may claim to be longer than it
340 * really is. Here is the actual allocated length. */
341 unsigned alloclen =
342 le16_to_cpu(dev->config[i].desc.wTotalLength);
343
344 len = length - (*ppos - pos);
345 if (len > nbytes)
346 len = nbytes;
347
348 /* Simply don't write (skip over) unallocated parts */
349 if (alloclen > (*ppos - pos)) {
350 alloclen -= (*ppos - pos);
351 if (copy_to_user(buf,
352 dev->rawdescriptors[i] + (*ppos - pos),
353 min(len, alloclen))) {
354 ret = -EFAULT;
355 goto err;
356 }
357 }
358
359 *ppos += len;
360 buf += len;
361 nbytes -= len;
362 ret += len;
363 }
364
365 pos += length;
366 }
367
368err:
369 usb_unlock_device(dev);
370 return ret;
371}
372
373/*
374 * async list handling
375 */
376
377static struct async *alloc_async(unsigned int numisoframes)
378{
379 struct async *as;
380
381 as = kzalloc(sizeof(struct async), GFP_KERNEL);
382 if (!as)
383 return NULL;
384 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
385 if (!as->urb) {
386 kfree(as);
387 return NULL;
388 }
389 return as;
390}
391
392static void free_async(struct async *as)
393{
394 int i;
395
396 put_pid(as->pid);
397 if (as->cred)
398 put_cred(as->cred);
399 for (i = 0; i < as->urb->num_sgs; i++) {
400 if (sg_page(&as->urb->sg[i]))
401 kfree(sg_virt(&as->urb->sg[i]));
402 }
403
404 kfree(as->urb->sg);
405 if (as->usbm == NULL)
406 kfree(as->urb->transfer_buffer);
407 else
408 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
409
410 kfree(as->urb->setup_packet);
411 usb_free_urb(as->urb);
412 usbfs_decrease_memory_usage(as->mem_usage);
413 kfree(as);
414}
415
416static void async_newpending(struct async *as)
417{
418 struct usb_dev_state *ps = as->ps;
419 unsigned long flags;
420
421 spin_lock_irqsave(&ps->lock, flags);
422 list_add_tail(&as->asynclist, &ps->async_pending);
423 spin_unlock_irqrestore(&ps->lock, flags);
424}
425
426static void async_removepending(struct async *as)
427{
428 struct usb_dev_state *ps = as->ps;
429 unsigned long flags;
430
431 spin_lock_irqsave(&ps->lock, flags);
432 list_del_init(&as->asynclist);
433 spin_unlock_irqrestore(&ps->lock, flags);
434}
435
436static struct async *async_getcompleted(struct usb_dev_state *ps)
437{
438 unsigned long flags;
439 struct async *as = NULL;
440
441 spin_lock_irqsave(&ps->lock, flags);
442 if (!list_empty(&ps->async_completed)) {
443 as = list_entry(ps->async_completed.next, struct async,
444 asynclist);
445 list_del_init(&as->asynclist);
446 }
447 spin_unlock_irqrestore(&ps->lock, flags);
448 return as;
449}
450
451static struct async *async_getpending(struct usb_dev_state *ps,
452 void __user *userurb)
453{
454 struct async *as;
455
456 list_for_each_entry(as, &ps->async_pending, asynclist)
457 if (as->userurb == userurb) {
458 list_del_init(&as->asynclist);
459 return as;
460 }
461
462 return NULL;
463}
464
465static void snoop_urb(struct usb_device *udev,
466 void __user *userurb, int pipe, unsigned length,
467 int timeout_or_status, enum snoop_when when,
468 unsigned char *data, unsigned data_len)
469{
470 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
471 static const char *dirs[] = {"out", "in"};
472 int ep;
473 const char *t, *d;
474
475 if (!usbfs_snoop)
476 return;
477
478 ep = usb_pipeendpoint(pipe);
479 t = types[usb_pipetype(pipe)];
480 d = dirs[!!usb_pipein(pipe)];
481
482 if (userurb) { /* Async */
483 if (when == SUBMIT)
484 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
485 "length %u\n",
486 userurb, ep, t, d, length);
487 else
488 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
489 "actual_length %u status %d\n",
490 userurb, ep, t, d, length,
491 timeout_or_status);
492 } else {
493 if (when == SUBMIT)
494 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
495 "timeout %d\n",
496 ep, t, d, length, timeout_or_status);
497 else
498 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
499 "status %d\n",
500 ep, t, d, length, timeout_or_status);
501 }
502
503 data_len = min(data_len, usbfs_snoop_max);
504 if (data && data_len > 0) {
505 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
506 data, data_len, 1);
507 }
508}
509
510static void snoop_urb_data(struct urb *urb, unsigned len)
511{
512 int i, size;
513
514 len = min(len, usbfs_snoop_max);
515 if (!usbfs_snoop || len == 0)
516 return;
517
518 if (urb->num_sgs == 0) {
519 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
520 urb->transfer_buffer, len, 1);
521 return;
522 }
523
524 for (i = 0; i < urb->num_sgs && len; i++) {
525 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
526 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
527 sg_virt(&urb->sg[i]), size, 1);
528 len -= size;
529 }
530}
531
532static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
533{
534 unsigned i, len, size;
535
536 if (urb->number_of_packets > 0) /* Isochronous */
537 len = urb->transfer_buffer_length;
538 else /* Non-Isoc */
539 len = urb->actual_length;
540
541 if (urb->num_sgs == 0) {
542 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
543 return -EFAULT;
544 return 0;
545 }
546
547 for (i = 0; i < urb->num_sgs && len; i++) {
548 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
549 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
550 return -EFAULT;
551 userbuffer += size;
552 len -= size;
553 }
554
555 return 0;
556}
557
558#define AS_CONTINUATION 1
559#define AS_UNLINK 2
560
561static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
562__releases(ps->lock)
563__acquires(ps->lock)
564{
565 struct urb *urb;
566 struct async *as;
567
568 /* Mark all the pending URBs that match bulk_addr, up to but not
569 * including the first one without AS_CONTINUATION. If such an
570 * URB is encountered then a new transfer has already started so
571 * the endpoint doesn't need to be disabled; otherwise it does.
572 */
573 list_for_each_entry(as, &ps->async_pending, asynclist) {
574 if (as->bulk_addr == bulk_addr) {
575 if (as->bulk_status != AS_CONTINUATION)
576 goto rescan;
577 as->bulk_status = AS_UNLINK;
578 as->bulk_addr = 0;
579 }
580 }
581 ps->disabled_bulk_eps |= (1 << bulk_addr);
582
583 /* Now carefully unlink all the marked pending URBs */
584 rescan:
585 list_for_each_entry(as, &ps->async_pending, asynclist) {
586 if (as->bulk_status == AS_UNLINK) {
587 as->bulk_status = 0; /* Only once */
588 urb = as->urb;
589 usb_get_urb(urb);
590 spin_unlock(&ps->lock); /* Allow completions */
591 usb_unlink_urb(urb);
592 usb_put_urb(urb);
593 spin_lock(&ps->lock);
594 goto rescan;
595 }
596 }
597}
598
599static void async_completed(struct urb *urb)
600{
601 struct async *as = urb->context;
602 struct usb_dev_state *ps = as->ps;
603 struct siginfo sinfo;
604 struct pid *pid = NULL;
605 u32 secid = 0;
606 const struct cred *cred = NULL;
607 int signr;
608
609 spin_lock(&ps->lock);
610 list_move_tail(&as->asynclist, &ps->async_completed);
611 as->status = urb->status;
612 signr = as->signr;
613 if (signr) {
614 memset(&sinfo, 0, sizeof(sinfo));
615 sinfo.si_signo = as->signr;
616 sinfo.si_errno = as->status;
617 sinfo.si_code = SI_ASYNCIO;
618 sinfo.si_addr = as->userurb;
619 pid = get_pid(as->pid);
620 cred = get_cred(as->cred);
621 secid = as->secid;
622 }
623 snoop(&urb->dev->dev, "urb complete\n");
624 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
625 as->status, COMPLETE, NULL, 0);
626 if ((urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN)
627 snoop_urb_data(urb, urb->actual_length);
628
629 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
630 as->status != -ENOENT)
631 cancel_bulk_urbs(ps, as->bulk_addr);
632 spin_unlock(&ps->lock);
633
634 if (signr) {
635 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
636 put_pid(pid);
637 put_cred(cred);
638 }
639
640 wake_up(&ps->wait);
641}
642
643static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
644{
645 struct urb *urb;
646 struct async *as;
647 unsigned long flags;
648
649 spin_lock_irqsave(&ps->lock, flags);
650 while (!list_empty(list)) {
651 as = list_entry(list->next, struct async, asynclist);
652 list_del_init(&as->asynclist);
653 urb = as->urb;
654 usb_get_urb(urb);
655
656 /* drop the spinlock so the completion handler can run */
657 spin_unlock_irqrestore(&ps->lock, flags);
658 usb_kill_urb(urb);
659 usb_put_urb(urb);
660 spin_lock_irqsave(&ps->lock, flags);
661 }
662 spin_unlock_irqrestore(&ps->lock, flags);
663}
664
665static void destroy_async_on_interface(struct usb_dev_state *ps,
666 unsigned int ifnum)
667{
668 struct list_head *p, *q, hitlist;
669 unsigned long flags;
670
671 INIT_LIST_HEAD(&hitlist);
672 spin_lock_irqsave(&ps->lock, flags);
673 list_for_each_safe(p, q, &ps->async_pending)
674 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
675 list_move_tail(p, &hitlist);
676 spin_unlock_irqrestore(&ps->lock, flags);
677 destroy_async(ps, &hitlist);
678}
679
680static void destroy_all_async(struct usb_dev_state *ps)
681{
682 destroy_async(ps, &ps->async_pending);
683}
684
685/*
686 * interface claims are made only at the request of user level code,
687 * which can also release them (explicitly or by closing files).
688 * they're also undone when devices disconnect.
689 */
690
691static int driver_probe(struct usb_interface *intf,
692 const struct usb_device_id *id)
693{
694 return -ENODEV;
695}
696
697static void driver_disconnect(struct usb_interface *intf)
698{
699 struct usb_dev_state *ps = usb_get_intfdata(intf);
700 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
701
702 if (!ps)
703 return;
704
705 /* NOTE: this relies on usbcore having canceled and completed
706 * all pending I/O requests; 2.6 does that.
707 */
708
709 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
710 clear_bit(ifnum, &ps->ifclaimed);
711 else
712 dev_warn(&intf->dev, "interface number %u out of range\n",
713 ifnum);
714
715 usb_set_intfdata(intf, NULL);
716
717 /* force async requests to complete */
718 destroy_async_on_interface(ps, ifnum);
719}
720
721/* The following routines are merely placeholders. There is no way
722 * to inform a user task about suspend or resumes.
723 */
724static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
725{
726 return 0;
727}
728
729static int driver_resume(struct usb_interface *intf)
730{
731 return 0;
732}
733
734struct usb_driver usbfs_driver = {
735 .name = "usbfs",
736 .probe = driver_probe,
737 .disconnect = driver_disconnect,
738 .suspend = driver_suspend,
739 .resume = driver_resume,
740};
741
742static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
743{
744 struct usb_device *dev = ps->dev;
745 struct usb_interface *intf;
746 int err;
747
748 if (ifnum >= 8*sizeof(ps->ifclaimed))
749 return -EINVAL;
750 /* already claimed */
751 if (test_bit(ifnum, &ps->ifclaimed))
752 return 0;
753
754 if (ps->privileges_dropped &&
755 !test_bit(ifnum, &ps->interface_allowed_mask))
756 return -EACCES;
757
758 intf = usb_ifnum_to_if(dev, ifnum);
759 if (!intf)
760 err = -ENOENT;
761 else
762 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
763 if (err == 0)
764 set_bit(ifnum, &ps->ifclaimed);
765 return err;
766}
767
768static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
769{
770 struct usb_device *dev;
771 struct usb_interface *intf;
772 int err;
773
774 err = -EINVAL;
775 if (ifnum >= 8*sizeof(ps->ifclaimed))
776 return err;
777 dev = ps->dev;
778 intf = usb_ifnum_to_if(dev, ifnum);
779 if (!intf)
780 err = -ENOENT;
781 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
782 usb_driver_release_interface(&usbfs_driver, intf);
783 err = 0;
784 }
785 return err;
786}
787
788static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
789{
790 if (ps->dev->state != USB_STATE_CONFIGURED)
791 return -EHOSTUNREACH;
792 if (ifnum >= 8*sizeof(ps->ifclaimed))
793 return -EINVAL;
794 if (test_bit(ifnum, &ps->ifclaimed))
795 return 0;
796 /* if not yet claimed, claim it for the driver */
797 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
798 "interface %u before use\n", task_pid_nr(current),
799 current->comm, ifnum);
800 return claimintf(ps, ifnum);
801}
802
803static int findintfep(struct usb_device *dev, unsigned int ep)
804{
805 unsigned int i, j, e;
806 struct usb_interface *intf;
807 struct usb_host_interface *alts;
808 struct usb_endpoint_descriptor *endpt;
809
810 if (ep & ~(USB_DIR_IN|0xf))
811 return -EINVAL;
812 if (!dev->actconfig)
813 return -ESRCH;
814 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
815 intf = dev->actconfig->interface[i];
816 for (j = 0; j < intf->num_altsetting; j++) {
817 alts = &intf->altsetting[j];
818 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
819 endpt = &alts->endpoint[e].desc;
820 if (endpt->bEndpointAddress == ep)
821 return alts->desc.bInterfaceNumber;
822 }
823 }
824 }
825 return -ENOENT;
826}
827
828static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
829 unsigned int request, unsigned int index)
830{
831 int ret = 0;
832 struct usb_host_interface *alt_setting;
833
834 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
835 && ps->dev->state != USB_STATE_ADDRESS
836 && ps->dev->state != USB_STATE_CONFIGURED)
837 return -EHOSTUNREACH;
838 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
839 return 0;
840
841 /*
842 * check for the special corner case 'get_device_id' in the printer
843 * class specification, which we always want to allow as it is used
844 * to query things like ink level, etc.
845 */
846 if (requesttype == 0xa1 && request == 0) {
847 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
848 index >> 8, index & 0xff);
849 if (alt_setting
850 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
851 return 0;
852 }
853
854 index &= 0xff;
855 switch (requesttype & USB_RECIP_MASK) {
856 case USB_RECIP_ENDPOINT:
857 if ((index & ~USB_DIR_IN) == 0)
858 return 0;
859 ret = findintfep(ps->dev, index);
860 if (ret < 0) {
861 /*
862 * Some not fully compliant Win apps seem to get
863 * index wrong and have the endpoint number here
864 * rather than the endpoint address (with the
865 * correct direction). Win does let this through,
866 * so we'll not reject it here but leave it to
867 * the device to not break KVM. But we warn.
868 */
869 ret = findintfep(ps->dev, index ^ 0x80);
870 if (ret >= 0)
871 dev_info(&ps->dev->dev,
872 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
873 __func__, task_pid_nr(current),
874 current->comm, index, index ^ 0x80);
875 }
876 if (ret >= 0)
877 ret = checkintf(ps, ret);
878 break;
879
880 case USB_RECIP_INTERFACE:
881 ret = checkintf(ps, index);
882 break;
883 }
884 return ret;
885}
886
887static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
888 unsigned char ep)
889{
890 if (ep & USB_ENDPOINT_DIR_MASK)
891 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
892 else
893 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
894}
895
896static int parse_usbdevfs_streams(struct usb_dev_state *ps,
897 struct usbdevfs_streams __user *streams,
898 unsigned int *num_streams_ret,
899 unsigned int *num_eps_ret,
900 struct usb_host_endpoint ***eps_ret,
901 struct usb_interface **intf_ret)
902{
903 unsigned int i, num_streams, num_eps;
904 struct usb_host_endpoint **eps;
905 struct usb_interface *intf = NULL;
906 unsigned char ep;
907 int ifnum, ret;
908
909 if (get_user(num_streams, &streams->num_streams) ||
910 get_user(num_eps, &streams->num_eps))
911 return -EFAULT;
912
913 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
914 return -EINVAL;
915
916 /* The XHCI controller allows max 2 ^ 16 streams */
917 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
918 return -EINVAL;
919
920 eps = kmalloc(num_eps * sizeof(*eps), GFP_KERNEL);
921 if (!eps)
922 return -ENOMEM;
923
924 for (i = 0; i < num_eps; i++) {
925 if (get_user(ep, &streams->eps[i])) {
926 ret = -EFAULT;
927 goto error;
928 }
929 eps[i] = ep_to_host_endpoint(ps->dev, ep);
930 if (!eps[i]) {
931 ret = -EINVAL;
932 goto error;
933 }
934
935 /* usb_alloc/free_streams operate on an usb_interface */
936 ifnum = findintfep(ps->dev, ep);
937 if (ifnum < 0) {
938 ret = ifnum;
939 goto error;
940 }
941
942 if (i == 0) {
943 ret = checkintf(ps, ifnum);
944 if (ret < 0)
945 goto error;
946 intf = usb_ifnum_to_if(ps->dev, ifnum);
947 } else {
948 /* Verify all eps belong to the same interface */
949 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
950 ret = -EINVAL;
951 goto error;
952 }
953 }
954 }
955
956 if (num_streams_ret)
957 *num_streams_ret = num_streams;
958 *num_eps_ret = num_eps;
959 *eps_ret = eps;
960 *intf_ret = intf;
961
962 return 0;
963
964error:
965 kfree(eps);
966 return ret;
967}
968
969static int match_devt(struct device *dev, void *data)
970{
971 return dev->devt == (dev_t) (unsigned long) data;
972}
973
974static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
975{
976 struct device *dev;
977
978 dev = bus_find_device(&usb_bus_type, NULL,
979 (void *) (unsigned long) devt, match_devt);
980 if (!dev)
981 return NULL;
982 return to_usb_device(dev);
983}
984
985/*
986 * file operations
987 */
988static int usbdev_open(struct inode *inode, struct file *file)
989{
990 struct usb_device *dev = NULL;
991 struct usb_dev_state *ps;
992 int ret;
993
994 ret = -ENOMEM;
995 ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
996 if (!ps)
997 goto out_free_ps;
998
999 ret = -ENODEV;
1000
1001 /* Protect against simultaneous removal or release */
1002 mutex_lock(&usbfs_mutex);
1003
1004 /* usbdev device-node */
1005 if (imajor(inode) == USB_DEVICE_MAJOR)
1006 dev = usbdev_lookup_by_devt(inode->i_rdev);
1007
1008 mutex_unlock(&usbfs_mutex);
1009
1010 if (!dev)
1011 goto out_free_ps;
1012
1013 usb_lock_device(dev);
1014 if (dev->state == USB_STATE_NOTATTACHED)
1015 goto out_unlock_device;
1016
1017 ret = usb_autoresume_device(dev);
1018 if (ret)
1019 goto out_unlock_device;
1020
1021 ps->dev = dev;
1022 ps->file = file;
1023 ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1024 spin_lock_init(&ps->lock);
1025 INIT_LIST_HEAD(&ps->list);
1026 INIT_LIST_HEAD(&ps->async_pending);
1027 INIT_LIST_HEAD(&ps->async_completed);
1028 INIT_LIST_HEAD(&ps->memory_list);
1029 init_waitqueue_head(&ps->wait);
1030 ps->disc_pid = get_pid(task_pid(current));
1031 ps->cred = get_current_cred();
1032 security_task_getsecid(current, &ps->secid);
1033 smp_wmb();
1034 list_add_tail(&ps->list, &dev->filelist);
1035 file->private_data = ps;
1036 usb_unlock_device(dev);
1037 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1038 current->comm);
1039 return ret;
1040
1041 out_unlock_device:
1042 usb_unlock_device(dev);
1043 usb_put_dev(dev);
1044 out_free_ps:
1045 kfree(ps);
1046 return ret;
1047}
1048
1049static int usbdev_release(struct inode *inode, struct file *file)
1050{
1051 struct usb_dev_state *ps = file->private_data;
1052 struct usb_device *dev = ps->dev;
1053 unsigned int ifnum;
1054 struct async *as;
1055
1056 usb_lock_device(dev);
1057 usb_hub_release_all_ports(dev, ps);
1058
1059 list_del_init(&ps->list);
1060
1061 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1062 ifnum++) {
1063 if (test_bit(ifnum, &ps->ifclaimed))
1064 releaseintf(ps, ifnum);
1065 }
1066 destroy_all_async(ps);
1067 usb_autosuspend_device(dev);
1068 usb_unlock_device(dev);
1069 usb_put_dev(dev);
1070 put_pid(ps->disc_pid);
1071 put_cred(ps->cred);
1072
1073 as = async_getcompleted(ps);
1074 while (as) {
1075 free_async(as);
1076 as = async_getcompleted(ps);
1077 }
1078
1079 kfree(ps);
1080 return 0;
1081}
1082
1083static int proc_control(struct usb_dev_state *ps, void __user *arg)
1084{
1085 struct usb_device *dev = ps->dev;
1086 struct usbdevfs_ctrltransfer ctrl;
1087 unsigned int tmo;
1088 unsigned char *tbuf;
1089 unsigned wLength;
1090 int i, pipe, ret;
1091
1092 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1093 return -EFAULT;
1094 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
1095 ctrl.wIndex);
1096 if (ret)
1097 return ret;
1098 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
1099 if (wLength > PAGE_SIZE)
1100 return -EINVAL;
1101 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1102 sizeof(struct usb_ctrlrequest));
1103 if (ret)
1104 return ret;
1105 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1106 if (!tbuf) {
1107 ret = -ENOMEM;
1108 goto done;
1109 }
1110 tmo = ctrl.timeout;
1111 snoop(&dev->dev, "control urb: bRequestType=%02x "
1112 "bRequest=%02x wValue=%04x "
1113 "wIndex=%04x wLength=%04x\n",
1114 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1115 ctrl.wIndex, ctrl.wLength);
1116 if (ctrl.bRequestType & 0x80) {
1117 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
1118 ctrl.wLength)) {
1119 ret = -EINVAL;
1120 goto done;
1121 }
1122 pipe = usb_rcvctrlpipe(dev, 0);
1123 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1124
1125 usb_unlock_device(dev);
1126 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1127 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1128 tbuf, ctrl.wLength, tmo);
1129 usb_lock_device(dev);
1130 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1131 tbuf, max(i, 0));
1132 if ((i > 0) && ctrl.wLength) {
1133 if (copy_to_user(ctrl.data, tbuf, i)) {
1134 ret = -EFAULT;
1135 goto done;
1136 }
1137 }
1138 } else {
1139 if (ctrl.wLength) {
1140 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1141 ret = -EFAULT;
1142 goto done;
1143 }
1144 }
1145 pipe = usb_sndctrlpipe(dev, 0);
1146 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1147 tbuf, ctrl.wLength);
1148
1149 usb_unlock_device(dev);
1150 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1151 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1152 tbuf, ctrl.wLength, tmo);
1153 usb_lock_device(dev);
1154 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1155 }
1156 if (i < 0 && i != -EPIPE) {
1157 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1158 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1159 current->comm, ctrl.bRequestType, ctrl.bRequest,
1160 ctrl.wLength, i);
1161 }
1162 ret = i;
1163 done:
1164 free_page((unsigned long) tbuf);
1165 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1166 sizeof(struct usb_ctrlrequest));
1167 return ret;
1168}
1169
1170static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1171{
1172 struct usb_device *dev = ps->dev;
1173 struct usbdevfs_bulktransfer bulk;
1174 unsigned int tmo, len1, pipe;
1175 int len2;
1176 unsigned char *tbuf;
1177 int i, ret;
1178
1179 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1180 return -EFAULT;
1181 ret = findintfep(ps->dev, bulk.ep);
1182 if (ret < 0)
1183 return ret;
1184 ret = checkintf(ps, ret);
1185 if (ret)
1186 return ret;
1187 if (bulk.ep & USB_DIR_IN)
1188 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1189 else
1190 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1191 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1192 return -EINVAL;
1193 len1 = bulk.len;
1194 if (len1 >= USBFS_XFER_MAX)
1195 return -EINVAL;
1196 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1197 if (ret)
1198 return ret;
1199 tbuf = kmalloc(len1, GFP_KERNEL);
1200 if (!tbuf) {
1201 ret = -ENOMEM;
1202 goto done;
1203 }
1204 tmo = bulk.timeout;
1205 if (bulk.ep & 0x80) {
1206 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1207 ret = -EINVAL;
1208 goto done;
1209 }
1210 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1211
1212 usb_unlock_device(dev);
1213 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1214 usb_lock_device(dev);
1215 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1216
1217 if (!i && len2) {
1218 if (copy_to_user(bulk.data, tbuf, len2)) {
1219 ret = -EFAULT;
1220 goto done;
1221 }
1222 }
1223 } else {
1224 if (len1) {
1225 if (copy_from_user(tbuf, bulk.data, len1)) {
1226 ret = -EFAULT;
1227 goto done;
1228 }
1229 }
1230 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1231
1232 usb_unlock_device(dev);
1233 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1234 usb_lock_device(dev);
1235 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1236 }
1237 ret = (i < 0 ? i : len2);
1238 done:
1239 kfree(tbuf);
1240 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1241 return ret;
1242}
1243
1244static void check_reset_of_active_ep(struct usb_device *udev,
1245 unsigned int epnum, char *ioctl_name)
1246{
1247 struct usb_host_endpoint **eps;
1248 struct usb_host_endpoint *ep;
1249
1250 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1251 ep = eps[epnum & 0x0f];
1252 if (ep && !list_empty(&ep->urb_list))
1253 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1254 task_pid_nr(current), current->comm,
1255 ioctl_name, epnum);
1256}
1257
1258static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1259{
1260 unsigned int ep;
1261 int ret;
1262
1263 if (get_user(ep, (unsigned int __user *)arg))
1264 return -EFAULT;
1265 ret = findintfep(ps->dev, ep);
1266 if (ret < 0)
1267 return ret;
1268 ret = checkintf(ps, ret);
1269 if (ret)
1270 return ret;
1271 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1272 usb_reset_endpoint(ps->dev, ep);
1273 return 0;
1274}
1275
1276static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1277{
1278 unsigned int ep;
1279 int pipe;
1280 int ret;
1281
1282 if (get_user(ep, (unsigned int __user *)arg))
1283 return -EFAULT;
1284 ret = findintfep(ps->dev, ep);
1285 if (ret < 0)
1286 return ret;
1287 ret = checkintf(ps, ret);
1288 if (ret)
1289 return ret;
1290 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1291 if (ep & USB_DIR_IN)
1292 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1293 else
1294 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1295
1296 return usb_clear_halt(ps->dev, pipe);
1297}
1298
1299static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1300{
1301 struct usbdevfs_getdriver gd;
1302 struct usb_interface *intf;
1303 int ret;
1304
1305 if (copy_from_user(&gd, arg, sizeof(gd)))
1306 return -EFAULT;
1307 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1308 if (!intf || !intf->dev.driver)
1309 ret = -ENODATA;
1310 else {
1311 strlcpy(gd.driver, intf->dev.driver->name,
1312 sizeof(gd.driver));
1313 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1314 }
1315 return ret;
1316}
1317
1318static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1319{
1320 struct usbdevfs_connectinfo ci;
1321
1322 memset(&ci, 0, sizeof(ci));
1323 ci.devnum = ps->dev->devnum;
1324 ci.slow = ps->dev->speed == USB_SPEED_LOW;
1325
1326 if (copy_to_user(arg, &ci, sizeof(ci)))
1327 return -EFAULT;
1328 return 0;
1329}
1330
1331static int proc_resetdevice(struct usb_dev_state *ps)
1332{
1333 struct usb_host_config *actconfig = ps->dev->actconfig;
1334 struct usb_interface *interface;
1335 int i, number;
1336
1337 /* Don't allow a device reset if the process has dropped the
1338 * privilege to do such things and any of the interfaces are
1339 * currently claimed.
1340 */
1341 if (ps->privileges_dropped && actconfig) {
1342 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1343 interface = actconfig->interface[i];
1344 number = interface->cur_altsetting->desc.bInterfaceNumber;
1345 if (usb_interface_claimed(interface) &&
1346 !test_bit(number, &ps->ifclaimed)) {
1347 dev_warn(&ps->dev->dev,
1348 "usbfs: interface %d claimed by %s while '%s' resets device\n",
1349 number, interface->dev.driver->name, current->comm);
1350 return -EACCES;
1351 }
1352 }
1353 }
1354
1355 return usb_reset_device(ps->dev);
1356}
1357
1358static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1359{
1360 struct usbdevfs_setinterface setintf;
1361 int ret;
1362
1363 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1364 return -EFAULT;
1365 ret = checkintf(ps, setintf.interface);
1366 if (ret)
1367 return ret;
1368
1369 destroy_async_on_interface(ps, setintf.interface);
1370
1371 return usb_set_interface(ps->dev, setintf.interface,
1372 setintf.altsetting);
1373}
1374
1375static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1376{
1377 int u;
1378 int status = 0;
1379 struct usb_host_config *actconfig;
1380
1381 if (get_user(u, (int __user *)arg))
1382 return -EFAULT;
1383
1384 actconfig = ps->dev->actconfig;
1385
1386 /* Don't touch the device if any interfaces are claimed.
1387 * It could interfere with other drivers' operations, and if
1388 * an interface is claimed by usbfs it could easily deadlock.
1389 */
1390 if (actconfig) {
1391 int i;
1392
1393 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1394 if (usb_interface_claimed(actconfig->interface[i])) {
1395 dev_warn(&ps->dev->dev,
1396 "usbfs: interface %d claimed by %s "
1397 "while '%s' sets config #%d\n",
1398 actconfig->interface[i]
1399 ->cur_altsetting
1400 ->desc.bInterfaceNumber,
1401 actconfig->interface[i]
1402 ->dev.driver->name,
1403 current->comm, u);
1404 status = -EBUSY;
1405 break;
1406 }
1407 }
1408 }
1409
1410 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1411 * so avoid usb_set_configuration()'s kick to sysfs
1412 */
1413 if (status == 0) {
1414 if (actconfig && actconfig->desc.bConfigurationValue == u)
1415 status = usb_reset_configuration(ps->dev);
1416 else
1417 status = usb_set_configuration(ps->dev, u);
1418 }
1419
1420 return status;
1421}
1422
1423static struct usb_memory *
1424find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1425{
1426 struct usb_memory *usbm = NULL, *iter;
1427 unsigned long flags;
1428 unsigned long uurb_start = (unsigned long)uurb->buffer;
1429
1430 spin_lock_irqsave(&ps->lock, flags);
1431 list_for_each_entry(iter, &ps->memory_list, memlist) {
1432 if (uurb_start >= iter->vm_start &&
1433 uurb_start < iter->vm_start + iter->size) {
1434 if (uurb->buffer_length > iter->vm_start + iter->size -
1435 uurb_start) {
1436 usbm = ERR_PTR(-EINVAL);
1437 } else {
1438 usbm = iter;
1439 usbm->urb_use_count++;
1440 }
1441 break;
1442 }
1443 }
1444 spin_unlock_irqrestore(&ps->lock, flags);
1445 return usbm;
1446}
1447
1448static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1449 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1450 void __user *arg)
1451{
1452 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1453 struct usb_host_endpoint *ep;
1454 struct async *as = NULL;
1455 struct usb_ctrlrequest *dr = NULL;
1456 unsigned int u, totlen, isofrmlen;
1457 int i, ret, is_in, num_sgs = 0, ifnum = -1;
1458 int number_of_packets = 0;
1459 unsigned int stream_id = 0;
1460 void *buf;
1461
1462 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1463 USBDEVFS_URB_SHORT_NOT_OK |
1464 USBDEVFS_URB_BULK_CONTINUATION |
1465 USBDEVFS_URB_NO_FSBR |
1466 USBDEVFS_URB_ZERO_PACKET |
1467 USBDEVFS_URB_NO_INTERRUPT))
1468 return -EINVAL;
1469 if (uurb->buffer_length > 0 && !uurb->buffer)
1470 return -EINVAL;
1471 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1472 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1473 ifnum = findintfep(ps->dev, uurb->endpoint);
1474 if (ifnum < 0)
1475 return ifnum;
1476 ret = checkintf(ps, ifnum);
1477 if (ret)
1478 return ret;
1479 }
1480 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1481 if (!ep)
1482 return -ENOENT;
1483 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1484
1485 u = 0;
1486 switch (uurb->type) {
1487 case USBDEVFS_URB_TYPE_CONTROL:
1488 if (!usb_endpoint_xfer_control(&ep->desc))
1489 return -EINVAL;
1490 /* min 8 byte setup packet */
1491 if (uurb->buffer_length < 8)
1492 return -EINVAL;
1493 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1494 if (!dr)
1495 return -ENOMEM;
1496 if (copy_from_user(dr, uurb->buffer, 8)) {
1497 ret = -EFAULT;
1498 goto error;
1499 }
1500 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1501 ret = -EINVAL;
1502 goto error;
1503 }
1504 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1505 le16_to_cpup(&dr->wIndex));
1506 if (ret)
1507 goto error;
1508 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1509 uurb->buffer += 8;
1510 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1511 is_in = 1;
1512 uurb->endpoint |= USB_DIR_IN;
1513 } else {
1514 is_in = 0;
1515 uurb->endpoint &= ~USB_DIR_IN;
1516 }
1517 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1518 "bRequest=%02x wValue=%04x "
1519 "wIndex=%04x wLength=%04x\n",
1520 dr->bRequestType, dr->bRequest,
1521 __le16_to_cpup(&dr->wValue),
1522 __le16_to_cpup(&dr->wIndex),
1523 __le16_to_cpup(&dr->wLength));
1524 u = sizeof(struct usb_ctrlrequest);
1525 break;
1526
1527 case USBDEVFS_URB_TYPE_BULK:
1528 switch (usb_endpoint_type(&ep->desc)) {
1529 case USB_ENDPOINT_XFER_CONTROL:
1530 case USB_ENDPOINT_XFER_ISOC:
1531 return -EINVAL;
1532 case USB_ENDPOINT_XFER_INT:
1533 /* allow single-shot interrupt transfers */
1534 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1535 goto interrupt_urb;
1536 }
1537 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1538 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1539 num_sgs = 0;
1540 if (ep->streams)
1541 stream_id = uurb->stream_id;
1542 break;
1543
1544 case USBDEVFS_URB_TYPE_INTERRUPT:
1545 if (!usb_endpoint_xfer_int(&ep->desc))
1546 return -EINVAL;
1547 interrupt_urb:
1548 break;
1549
1550 case USBDEVFS_URB_TYPE_ISO:
1551 /* arbitrary limit */
1552 if (uurb->number_of_packets < 1 ||
1553 uurb->number_of_packets > 128)
1554 return -EINVAL;
1555 if (!usb_endpoint_xfer_isoc(&ep->desc))
1556 return -EINVAL;
1557 number_of_packets = uurb->number_of_packets;
1558 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1559 number_of_packets;
1560 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1561 if (IS_ERR(isopkt)) {
1562 ret = PTR_ERR(isopkt);
1563 isopkt = NULL;
1564 goto error;
1565 }
1566 for (totlen = u = 0; u < number_of_packets; u++) {
1567 /*
1568 * arbitrary limit need for USB 3.0
1569 * bMaxBurst (0~15 allowed, 1~16 packets)
1570 * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1571 * sizemax: 1024 * 16 * 3 = 49152
1572 */
1573 if (isopkt[u].length > 49152) {
1574 ret = -EINVAL;
1575 goto error;
1576 }
1577 totlen += isopkt[u].length;
1578 }
1579 u *= sizeof(struct usb_iso_packet_descriptor);
1580 uurb->buffer_length = totlen;
1581 break;
1582
1583 default:
1584 return -EINVAL;
1585 }
1586
1587 if (uurb->buffer_length >= USBFS_XFER_MAX) {
1588 ret = -EINVAL;
1589 goto error;
1590 }
1591 if (uurb->buffer_length > 0 &&
1592 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1593 uurb->buffer, uurb->buffer_length)) {
1594 ret = -EFAULT;
1595 goto error;
1596 }
1597 as = alloc_async(number_of_packets);
1598 if (!as) {
1599 ret = -ENOMEM;
1600 goto error;
1601 }
1602
1603 as->usbm = find_memory_area(ps, uurb);
1604 if (IS_ERR(as->usbm)) {
1605 ret = PTR_ERR(as->usbm);
1606 as->usbm = NULL;
1607 goto error;
1608 }
1609
1610 /* do not use SG buffers when memory mapped segments
1611 * are in use
1612 */
1613 if (as->usbm)
1614 num_sgs = 0;
1615
1616 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1617 num_sgs * sizeof(struct scatterlist);
1618 ret = usbfs_increase_memory_usage(u);
1619 if (ret)
1620 goto error;
1621 as->mem_usage = u;
1622
1623 if (num_sgs) {
1624 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1625 GFP_KERNEL);
1626 if (!as->urb->sg) {
1627 ret = -ENOMEM;
1628 goto error;
1629 }
1630 as->urb->num_sgs = num_sgs;
1631 sg_init_table(as->urb->sg, as->urb->num_sgs);
1632
1633 totlen = uurb->buffer_length;
1634 for (i = 0; i < as->urb->num_sgs; i++) {
1635 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1636 buf = kmalloc(u, GFP_KERNEL);
1637 if (!buf) {
1638 ret = -ENOMEM;
1639 goto error;
1640 }
1641 sg_set_buf(&as->urb->sg[i], buf, u);
1642
1643 if (!is_in) {
1644 if (copy_from_user(buf, uurb->buffer, u)) {
1645 ret = -EFAULT;
1646 goto error;
1647 }
1648 uurb->buffer += u;
1649 }
1650 totlen -= u;
1651 }
1652 } else if (uurb->buffer_length > 0) {
1653 if (as->usbm) {
1654 unsigned long uurb_start = (unsigned long)uurb->buffer;
1655
1656 as->urb->transfer_buffer = as->usbm->mem +
1657 (uurb_start - as->usbm->vm_start);
1658 } else {
1659 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1660 GFP_KERNEL);
1661 if (!as->urb->transfer_buffer) {
1662 ret = -ENOMEM;
1663 goto error;
1664 }
1665 if (!is_in) {
1666 if (copy_from_user(as->urb->transfer_buffer,
1667 uurb->buffer,
1668 uurb->buffer_length)) {
1669 ret = -EFAULT;
1670 goto error;
1671 }
1672 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1673 /*
1674 * Isochronous input data may end up being
1675 * discontiguous if some of the packets are
1676 * short. Clear the buffer so that the gaps
1677 * don't leak kernel data to userspace.
1678 */
1679 memset(as->urb->transfer_buffer, 0,
1680 uurb->buffer_length);
1681 }
1682 }
1683 }
1684 as->urb->dev = ps->dev;
1685 as->urb->pipe = (uurb->type << 30) |
1686 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1687 (uurb->endpoint & USB_DIR_IN);
1688
1689 /* This tedious sequence is necessary because the URB_* flags
1690 * are internal to the kernel and subject to change, whereas
1691 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1692 */
1693 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1694 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1695 u |= URB_ISO_ASAP;
1696 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK && is_in)
1697 u |= URB_SHORT_NOT_OK;
1698 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1699 u |= URB_NO_FSBR;
1700 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1701 u |= URB_ZERO_PACKET;
1702 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1703 u |= URB_NO_INTERRUPT;
1704 as->urb->transfer_flags = u;
1705
1706 as->urb->transfer_buffer_length = uurb->buffer_length;
1707 as->urb->setup_packet = (unsigned char *)dr;
1708 dr = NULL;
1709 as->urb->start_frame = uurb->start_frame;
1710 as->urb->number_of_packets = number_of_packets;
1711 as->urb->stream_id = stream_id;
1712
1713 if (ep->desc.bInterval) {
1714 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1715 ps->dev->speed == USB_SPEED_HIGH ||
1716 ps->dev->speed >= USB_SPEED_SUPER)
1717 as->urb->interval = 1 <<
1718 min(15, ep->desc.bInterval - 1);
1719 else
1720 as->urb->interval = ep->desc.bInterval;
1721 }
1722
1723 as->urb->context = as;
1724 as->urb->complete = async_completed;
1725 for (totlen = u = 0; u < number_of_packets; u++) {
1726 as->urb->iso_frame_desc[u].offset = totlen;
1727 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1728 totlen += isopkt[u].length;
1729 }
1730 kfree(isopkt);
1731 isopkt = NULL;
1732 as->ps = ps;
1733 as->userurb = arg;
1734 if (as->usbm) {
1735 unsigned long uurb_start = (unsigned long)uurb->buffer;
1736
1737 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1738 as->urb->transfer_dma = as->usbm->dma_handle +
1739 (uurb_start - as->usbm->vm_start);
1740 } else if (is_in && uurb->buffer_length > 0)
1741 as->userbuffer = uurb->buffer;
1742 as->signr = uurb->signr;
1743 as->ifnum = ifnum;
1744 as->pid = get_pid(task_pid(current));
1745 as->cred = get_current_cred();
1746 security_task_getsecid(current, &as->secid);
1747 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1748 as->urb->transfer_buffer_length, 0, SUBMIT,
1749 NULL, 0);
1750 if (!is_in)
1751 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1752
1753 async_newpending(as);
1754
1755 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1756 spin_lock_irq(&ps->lock);
1757
1758 /* Not exactly the endpoint address; the direction bit is
1759 * shifted to the 0x10 position so that the value will be
1760 * between 0 and 31.
1761 */
1762 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1763 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1764 >> 3);
1765
1766 /* If this bulk URB is the start of a new transfer, re-enable
1767 * the endpoint. Otherwise mark it as a continuation URB.
1768 */
1769 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1770 as->bulk_status = AS_CONTINUATION;
1771 else
1772 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1773
1774 /* Don't accept continuation URBs if the endpoint is
1775 * disabled because of an earlier error.
1776 */
1777 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1778 ret = -EREMOTEIO;
1779 else
1780 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1781 spin_unlock_irq(&ps->lock);
1782 } else {
1783 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1784 }
1785
1786 if (ret) {
1787 dev_printk(KERN_DEBUG, &ps->dev->dev,
1788 "usbfs: usb_submit_urb returned %d\n", ret);
1789 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1790 0, ret, COMPLETE, NULL, 0);
1791 async_removepending(as);
1792 goto error;
1793 }
1794 return 0;
1795
1796 error:
1797 if (as && as->usbm)
1798 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
1799 kfree(isopkt);
1800 kfree(dr);
1801 if (as)
1802 free_async(as);
1803 return ret;
1804}
1805
1806static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1807{
1808 struct usbdevfs_urb uurb;
1809
1810 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1811 return -EFAULT;
1812
1813 return proc_do_submiturb(ps, &uurb,
1814 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1815 arg);
1816}
1817
1818static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1819{
1820 struct urb *urb;
1821 struct async *as;
1822 unsigned long flags;
1823
1824 spin_lock_irqsave(&ps->lock, flags);
1825 as = async_getpending(ps, arg);
1826 if (!as) {
1827 spin_unlock_irqrestore(&ps->lock, flags);
1828 return -EINVAL;
1829 }
1830
1831 urb = as->urb;
1832 usb_get_urb(urb);
1833 spin_unlock_irqrestore(&ps->lock, flags);
1834
1835 usb_kill_urb(urb);
1836 usb_put_urb(urb);
1837
1838 return 0;
1839}
1840
1841static int processcompl(struct async *as, void __user * __user *arg)
1842{
1843 struct urb *urb = as->urb;
1844 struct usbdevfs_urb __user *userurb = as->userurb;
1845 void __user *addr = as->userurb;
1846 unsigned int i;
1847
1848 if (as->userbuffer && urb->actual_length) {
1849 if (copy_urb_data_to_user(as->userbuffer, urb))
1850 goto err_out;
1851 }
1852 if (put_user(as->status, &userurb->status))
1853 goto err_out;
1854 if (put_user(urb->actual_length, &userurb->actual_length))
1855 goto err_out;
1856 if (put_user(urb->error_count, &userurb->error_count))
1857 goto err_out;
1858
1859 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1860 for (i = 0; i < urb->number_of_packets; i++) {
1861 if (put_user(urb->iso_frame_desc[i].actual_length,
1862 &userurb->iso_frame_desc[i].actual_length))
1863 goto err_out;
1864 if (put_user(urb->iso_frame_desc[i].status,
1865 &userurb->iso_frame_desc[i].status))
1866 goto err_out;
1867 }
1868 }
1869
1870 if (put_user(addr, (void __user * __user *)arg))
1871 return -EFAULT;
1872 return 0;
1873
1874err_out:
1875 return -EFAULT;
1876}
1877
1878static struct async *reap_as(struct usb_dev_state *ps)
1879{
1880 DECLARE_WAITQUEUE(wait, current);
1881 struct async *as = NULL;
1882 struct usb_device *dev = ps->dev;
1883
1884 add_wait_queue(&ps->wait, &wait);
1885 for (;;) {
1886 __set_current_state(TASK_INTERRUPTIBLE);
1887 as = async_getcompleted(ps);
1888 if (as || !connected(ps))
1889 break;
1890 if (signal_pending(current))
1891 break;
1892 usb_unlock_device(dev);
1893 schedule();
1894 usb_lock_device(dev);
1895 }
1896 remove_wait_queue(&ps->wait, &wait);
1897 set_current_state(TASK_RUNNING);
1898 return as;
1899}
1900
1901static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1902{
1903 struct async *as = reap_as(ps);
1904
1905 if (as) {
1906 int retval;
1907
1908 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
1909 retval = processcompl(as, (void __user * __user *)arg);
1910 free_async(as);
1911 return retval;
1912 }
1913 if (signal_pending(current))
1914 return -EINTR;
1915 return -ENODEV;
1916}
1917
1918static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1919{
1920 int retval;
1921 struct async *as;
1922
1923 as = async_getcompleted(ps);
1924 if (as) {
1925 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
1926 retval = processcompl(as, (void __user * __user *)arg);
1927 free_async(as);
1928 } else {
1929 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1930 }
1931 return retval;
1932}
1933
1934#ifdef CONFIG_COMPAT
1935static int proc_control_compat(struct usb_dev_state *ps,
1936 struct usbdevfs_ctrltransfer32 __user *p32)
1937{
1938 struct usbdevfs_ctrltransfer __user *p;
1939 __u32 udata;
1940 p = compat_alloc_user_space(sizeof(*p));
1941 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1942 get_user(udata, &p32->data) ||
1943 put_user(compat_ptr(udata), &p->data))
1944 return -EFAULT;
1945 return proc_control(ps, p);
1946}
1947
1948static int proc_bulk_compat(struct usb_dev_state *ps,
1949 struct usbdevfs_bulktransfer32 __user *p32)
1950{
1951 struct usbdevfs_bulktransfer __user *p;
1952 compat_uint_t n;
1953 compat_caddr_t addr;
1954
1955 p = compat_alloc_user_space(sizeof(*p));
1956
1957 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1958 get_user(n, &p32->len) || put_user(n, &p->len) ||
1959 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1960 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1961 return -EFAULT;
1962
1963 return proc_bulk(ps, p);
1964}
1965static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1966{
1967 struct usbdevfs_disconnectsignal32 ds;
1968
1969 if (copy_from_user(&ds, arg, sizeof(ds)))
1970 return -EFAULT;
1971 ps->discsignr = ds.signr;
1972 ps->disccontext = compat_ptr(ds.context);
1973 return 0;
1974}
1975
1976static int get_urb32(struct usbdevfs_urb *kurb,
1977 struct usbdevfs_urb32 __user *uurb)
1978{
1979 __u32 uptr;
1980 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1981 __get_user(kurb->type, &uurb->type) ||
1982 __get_user(kurb->endpoint, &uurb->endpoint) ||
1983 __get_user(kurb->status, &uurb->status) ||
1984 __get_user(kurb->flags, &uurb->flags) ||
1985 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1986 __get_user(kurb->actual_length, &uurb->actual_length) ||
1987 __get_user(kurb->start_frame, &uurb->start_frame) ||
1988 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1989 __get_user(kurb->error_count, &uurb->error_count) ||
1990 __get_user(kurb->signr, &uurb->signr))
1991 return -EFAULT;
1992
1993 if (__get_user(uptr, &uurb->buffer))
1994 return -EFAULT;
1995 kurb->buffer = compat_ptr(uptr);
1996 if (__get_user(uptr, &uurb->usercontext))
1997 return -EFAULT;
1998 kurb->usercontext = compat_ptr(uptr);
1999
2000 return 0;
2001}
2002
2003static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2004{
2005 struct usbdevfs_urb uurb;
2006
2007 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2008 return -EFAULT;
2009
2010 return proc_do_submiturb(ps, &uurb,
2011 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2012 arg);
2013}
2014
2015static int processcompl_compat(struct async *as, void __user * __user *arg)
2016{
2017 struct urb *urb = as->urb;
2018 struct usbdevfs_urb32 __user *userurb = as->userurb;
2019 void __user *addr = as->userurb;
2020 unsigned int i;
2021
2022 if (as->userbuffer && urb->actual_length) {
2023 if (copy_urb_data_to_user(as->userbuffer, urb))
2024 return -EFAULT;
2025 }
2026 if (put_user(as->status, &userurb->status))
2027 return -EFAULT;
2028 if (put_user(urb->actual_length, &userurb->actual_length))
2029 return -EFAULT;
2030 if (put_user(urb->error_count, &userurb->error_count))
2031 return -EFAULT;
2032
2033 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2034 for (i = 0; i < urb->number_of_packets; i++) {
2035 if (put_user(urb->iso_frame_desc[i].actual_length,
2036 &userurb->iso_frame_desc[i].actual_length))
2037 return -EFAULT;
2038 if (put_user(urb->iso_frame_desc[i].status,
2039 &userurb->iso_frame_desc[i].status))
2040 return -EFAULT;
2041 }
2042 }
2043
2044 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2045 return -EFAULT;
2046 return 0;
2047}
2048
2049static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2050{
2051 struct async *as = reap_as(ps);
2052
2053 if (as) {
2054 int retval;
2055
2056 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
2057 retval = processcompl_compat(as, (void __user * __user *)arg);
2058 free_async(as);
2059 return retval;
2060 }
2061 if (signal_pending(current))
2062 return -EINTR;
2063 return -ENODEV;
2064}
2065
2066static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2067{
2068 int retval;
2069 struct async *as;
2070
2071 as = async_getcompleted(ps);
2072 if (as) {
2073 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
2074 retval = processcompl_compat(as, (void __user * __user *)arg);
2075 free_async(as);
2076 } else {
2077 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2078 }
2079 return retval;
2080}
2081
2082
2083#endif
2084
2085static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2086{
2087 struct usbdevfs_disconnectsignal ds;
2088
2089 if (copy_from_user(&ds, arg, sizeof(ds)))
2090 return -EFAULT;
2091 ps->discsignr = ds.signr;
2092 ps->disccontext = ds.context;
2093 return 0;
2094}
2095
2096static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2097{
2098 unsigned int ifnum;
2099
2100 if (get_user(ifnum, (unsigned int __user *)arg))
2101 return -EFAULT;
2102 return claimintf(ps, ifnum);
2103}
2104
2105static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2106{
2107 unsigned int ifnum;
2108 int ret;
2109
2110 if (get_user(ifnum, (unsigned int __user *)arg))
2111 return -EFAULT;
2112 ret = releaseintf(ps, ifnum);
2113 if (ret < 0)
2114 return ret;
2115 destroy_async_on_interface(ps, ifnum);
2116 return 0;
2117}
2118
2119static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2120{
2121 int size;
2122 void *buf = NULL;
2123 int retval = 0;
2124 struct usb_interface *intf = NULL;
2125 struct usb_driver *driver = NULL;
2126
2127 if (ps->privileges_dropped)
2128 return -EACCES;
2129
2130 /* alloc buffer */
2131 size = _IOC_SIZE(ctl->ioctl_code);
2132 if (size > 0) {
2133 buf = kmalloc(size, GFP_KERNEL);
2134 if (buf == NULL)
2135 return -ENOMEM;
2136 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2137 if (copy_from_user(buf, ctl->data, size)) {
2138 kfree(buf);
2139 return -EFAULT;
2140 }
2141 } else {
2142 memset(buf, 0, size);
2143 }
2144 }
2145
2146 if (!connected(ps)) {
2147 kfree(buf);
2148 return -ENODEV;
2149 }
2150
2151 if (ps->dev->state != USB_STATE_CONFIGURED)
2152 retval = -EHOSTUNREACH;
2153 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2154 retval = -EINVAL;
2155 else switch (ctl->ioctl_code) {
2156
2157 /* disconnect kernel driver from interface */
2158 case USBDEVFS_DISCONNECT:
2159 if (intf->dev.driver) {
2160 driver = to_usb_driver(intf->dev.driver);
2161 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2162 usb_driver_release_interface(driver, intf);
2163 } else
2164 retval = -ENODATA;
2165 break;
2166
2167 /* let kernel drivers try to (re)bind to the interface */
2168 case USBDEVFS_CONNECT:
2169 if (!intf->dev.driver)
2170 retval = device_attach(&intf->dev);
2171 else
2172 retval = -EBUSY;
2173 break;
2174
2175 /* talk directly to the interface's driver */
2176 default:
2177 if (intf->dev.driver)
2178 driver = to_usb_driver(intf->dev.driver);
2179 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2180 retval = -ENOTTY;
2181 } else {
2182 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2183 if (retval == -ENOIOCTLCMD)
2184 retval = -ENOTTY;
2185 }
2186 }
2187
2188 /* cleanup and return */
2189 if (retval >= 0
2190 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2191 && size > 0
2192 && copy_to_user(ctl->data, buf, size) != 0)
2193 retval = -EFAULT;
2194
2195 kfree(buf);
2196 return retval;
2197}
2198
2199static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2200{
2201 struct usbdevfs_ioctl ctrl;
2202
2203 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2204 return -EFAULT;
2205 return proc_ioctl(ps, &ctrl);
2206}
2207
2208#ifdef CONFIG_COMPAT
2209static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2210{
2211 struct usbdevfs_ioctl32 __user *uioc;
2212 struct usbdevfs_ioctl ctrl;
2213 u32 udata;
2214
2215 uioc = compat_ptr((long)arg);
2216 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
2217 __get_user(ctrl.ifno, &uioc->ifno) ||
2218 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
2219 __get_user(udata, &uioc->data))
2220 return -EFAULT;
2221 ctrl.data = compat_ptr(udata);
2222
2223 return proc_ioctl(ps, &ctrl);
2224}
2225#endif
2226
2227static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2228{
2229 unsigned portnum;
2230 int rc;
2231
2232 if (get_user(portnum, (unsigned __user *) arg))
2233 return -EFAULT;
2234 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2235 if (rc == 0)
2236 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2237 portnum, task_pid_nr(current), current->comm);
2238 return rc;
2239}
2240
2241static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2242{
2243 unsigned portnum;
2244
2245 if (get_user(portnum, (unsigned __user *) arg))
2246 return -EFAULT;
2247 return usb_hub_release_port(ps->dev, portnum, ps);
2248}
2249
2250static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2251{
2252 __u32 caps;
2253
2254 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2255 USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2256 USBDEVFS_CAP_DROP_PRIVILEGES;
2257 if (!ps->dev->bus->no_stop_on_short)
2258 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2259 if (ps->dev->bus->sg_tablesize)
2260 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2261
2262 if (put_user(caps, (__u32 __user *)arg))
2263 return -EFAULT;
2264
2265 return 0;
2266}
2267
2268static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2269{
2270 struct usbdevfs_disconnect_claim dc;
2271 struct usb_interface *intf;
2272
2273 if (copy_from_user(&dc, arg, sizeof(dc)))
2274 return -EFAULT;
2275
2276 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2277 if (!intf)
2278 return -EINVAL;
2279
2280 if (intf->dev.driver) {
2281 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2282
2283 if (ps->privileges_dropped)
2284 return -EACCES;
2285
2286 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2287 strncmp(dc.driver, intf->dev.driver->name,
2288 sizeof(dc.driver)) != 0)
2289 return -EBUSY;
2290
2291 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2292 strncmp(dc.driver, intf->dev.driver->name,
2293 sizeof(dc.driver)) == 0)
2294 return -EBUSY;
2295
2296 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2297 usb_driver_release_interface(driver, intf);
2298 }
2299
2300 return claimintf(ps, dc.interface);
2301}
2302
2303static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2304{
2305 unsigned num_streams, num_eps;
2306 struct usb_host_endpoint **eps;
2307 struct usb_interface *intf;
2308 int r;
2309
2310 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2311 &eps, &intf);
2312 if (r)
2313 return r;
2314
2315 destroy_async_on_interface(ps,
2316 intf->altsetting[0].desc.bInterfaceNumber);
2317
2318 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2319 kfree(eps);
2320 return r;
2321}
2322
2323static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2324{
2325 unsigned num_eps;
2326 struct usb_host_endpoint **eps;
2327 struct usb_interface *intf;
2328 int r;
2329
2330 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2331 if (r)
2332 return r;
2333
2334 destroy_async_on_interface(ps,
2335 intf->altsetting[0].desc.bInterfaceNumber);
2336
2337 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2338 kfree(eps);
2339 return r;
2340}
2341
2342static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2343{
2344 u32 data;
2345
2346 if (copy_from_user(&data, arg, sizeof(data)))
2347 return -EFAULT;
2348
2349 /* This is an one way operation. Once privileges are
2350 * dropped, you cannot regain them. You may however reissue
2351 * this ioctl to shrink the allowed interfaces mask.
2352 */
2353 ps->interface_allowed_mask &= data;
2354 ps->privileges_dropped = true;
2355
2356 return 0;
2357}
2358
2359/*
2360 * NOTE: All requests here that have interface numbers as parameters
2361 * are assuming that somehow the configuration has been prevented from
2362 * changing. But there's no mechanism to ensure that...
2363 */
2364static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2365 void __user *p)
2366{
2367 struct usb_dev_state *ps = file->private_data;
2368 struct inode *inode = file_inode(file);
2369 struct usb_device *dev = ps->dev;
2370 int ret = -ENOTTY;
2371
2372 if (!(file->f_mode & FMODE_WRITE))
2373 return -EPERM;
2374
2375 usb_lock_device(dev);
2376
2377 /* Reap operations are allowed even after disconnection */
2378 switch (cmd) {
2379 case USBDEVFS_REAPURB:
2380 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2381 ret = proc_reapurb(ps, p);
2382 goto done;
2383
2384 case USBDEVFS_REAPURBNDELAY:
2385 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2386 ret = proc_reapurbnonblock(ps, p);
2387 goto done;
2388
2389#ifdef CONFIG_COMPAT
2390 case USBDEVFS_REAPURB32:
2391 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2392 ret = proc_reapurb_compat(ps, p);
2393 goto done;
2394
2395 case USBDEVFS_REAPURBNDELAY32:
2396 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2397 ret = proc_reapurbnonblock_compat(ps, p);
2398 goto done;
2399#endif
2400 }
2401
2402 if (!connected(ps)) {
2403 usb_unlock_device(dev);
2404 return -ENODEV;
2405 }
2406
2407 switch (cmd) {
2408 case USBDEVFS_CONTROL:
2409 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2410 ret = proc_control(ps, p);
2411 if (ret >= 0)
2412 inode->i_mtime = current_time(inode);
2413 break;
2414
2415 case USBDEVFS_BULK:
2416 snoop(&dev->dev, "%s: BULK\n", __func__);
2417 ret = proc_bulk(ps, p);
2418 if (ret >= 0)
2419 inode->i_mtime = current_time(inode);
2420 break;
2421
2422 case USBDEVFS_RESETEP:
2423 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2424 ret = proc_resetep(ps, p);
2425 if (ret >= 0)
2426 inode->i_mtime = current_time(inode);
2427 break;
2428
2429 case USBDEVFS_RESET:
2430 snoop(&dev->dev, "%s: RESET\n", __func__);
2431 ret = proc_resetdevice(ps);
2432 break;
2433
2434 case USBDEVFS_CLEAR_HALT:
2435 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2436 ret = proc_clearhalt(ps, p);
2437 if (ret >= 0)
2438 inode->i_mtime = current_time(inode);
2439 break;
2440
2441 case USBDEVFS_GETDRIVER:
2442 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2443 ret = proc_getdriver(ps, p);
2444 break;
2445
2446 case USBDEVFS_CONNECTINFO:
2447 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2448 ret = proc_connectinfo(ps, p);
2449 break;
2450
2451 case USBDEVFS_SETINTERFACE:
2452 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2453 ret = proc_setintf(ps, p);
2454 break;
2455
2456 case USBDEVFS_SETCONFIGURATION:
2457 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2458 ret = proc_setconfig(ps, p);
2459 break;
2460
2461 case USBDEVFS_SUBMITURB:
2462 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2463 ret = proc_submiturb(ps, p);
2464 if (ret >= 0)
2465 inode->i_mtime = current_time(inode);
2466 break;
2467
2468#ifdef CONFIG_COMPAT
2469 case USBDEVFS_CONTROL32:
2470 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2471 ret = proc_control_compat(ps, p);
2472 if (ret >= 0)
2473 inode->i_mtime = current_time(inode);
2474 break;
2475
2476 case USBDEVFS_BULK32:
2477 snoop(&dev->dev, "%s: BULK32\n", __func__);
2478 ret = proc_bulk_compat(ps, p);
2479 if (ret >= 0)
2480 inode->i_mtime = current_time(inode);
2481 break;
2482
2483 case USBDEVFS_DISCSIGNAL32:
2484 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2485 ret = proc_disconnectsignal_compat(ps, p);
2486 break;
2487
2488 case USBDEVFS_SUBMITURB32:
2489 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2490 ret = proc_submiturb_compat(ps, p);
2491 if (ret >= 0)
2492 inode->i_mtime = current_time(inode);
2493 break;
2494
2495 case USBDEVFS_IOCTL32:
2496 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2497 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2498 break;
2499#endif
2500
2501 case USBDEVFS_DISCARDURB:
2502 snoop(&dev->dev, "%s: DISCARDURB %p\n", __func__, p);
2503 ret = proc_unlinkurb(ps, p);
2504 break;
2505
2506 case USBDEVFS_DISCSIGNAL:
2507 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2508 ret = proc_disconnectsignal(ps, p);
2509 break;
2510
2511 case USBDEVFS_CLAIMINTERFACE:
2512 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2513 ret = proc_claiminterface(ps, p);
2514 break;
2515
2516 case USBDEVFS_RELEASEINTERFACE:
2517 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2518 ret = proc_releaseinterface(ps, p);
2519 break;
2520
2521 case USBDEVFS_IOCTL:
2522 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2523 ret = proc_ioctl_default(ps, p);
2524 break;
2525
2526 case USBDEVFS_CLAIM_PORT:
2527 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2528 ret = proc_claim_port(ps, p);
2529 break;
2530
2531 case USBDEVFS_RELEASE_PORT:
2532 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2533 ret = proc_release_port(ps, p);
2534 break;
2535 case USBDEVFS_GET_CAPABILITIES:
2536 ret = proc_get_capabilities(ps, p);
2537 break;
2538 case USBDEVFS_DISCONNECT_CLAIM:
2539 ret = proc_disconnect_claim(ps, p);
2540 break;
2541 case USBDEVFS_ALLOC_STREAMS:
2542 ret = proc_alloc_streams(ps, p);
2543 break;
2544 case USBDEVFS_FREE_STREAMS:
2545 ret = proc_free_streams(ps, p);
2546 break;
2547 case USBDEVFS_DROP_PRIVILEGES:
2548 ret = proc_drop_privileges(ps, p);
2549 break;
2550 }
2551
2552 done:
2553 usb_unlock_device(dev);
2554 if (ret >= 0)
2555 inode->i_atime = current_time(inode);
2556 return ret;
2557}
2558
2559static long usbdev_ioctl(struct file *file, unsigned int cmd,
2560 unsigned long arg)
2561{
2562 int ret;
2563
2564 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2565
2566 return ret;
2567}
2568
2569#ifdef CONFIG_COMPAT
2570static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2571 unsigned long arg)
2572{
2573 int ret;
2574
2575 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2576
2577 return ret;
2578}
2579#endif
2580
2581/* No kernel lock - fine */
2582static unsigned int usbdev_poll(struct file *file,
2583 struct poll_table_struct *wait)
2584{
2585 struct usb_dev_state *ps = file->private_data;
2586 unsigned int mask = 0;
2587
2588 poll_wait(file, &ps->wait, wait);
2589 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2590 mask |= POLLOUT | POLLWRNORM;
2591 if (!connected(ps))
2592 mask |= POLLHUP;
2593 if (list_empty(&ps->list))
2594 mask |= POLLERR;
2595 return mask;
2596}
2597
2598const struct file_operations usbdev_file_operations = {
2599 .owner = THIS_MODULE,
2600 .llseek = no_seek_end_llseek,
2601 .read = usbdev_read,
2602 .poll = usbdev_poll,
2603 .unlocked_ioctl = usbdev_ioctl,
2604#ifdef CONFIG_COMPAT
2605 .compat_ioctl = usbdev_compat_ioctl,
2606#endif
2607 .mmap = usbdev_mmap,
2608 .open = usbdev_open,
2609 .release = usbdev_release,
2610};
2611
2612static void usbdev_remove(struct usb_device *udev)
2613{
2614 struct usb_dev_state *ps;
2615 struct siginfo sinfo;
2616
2617 while (!list_empty(&udev->filelist)) {
2618 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2619 destroy_all_async(ps);
2620 wake_up_all(&ps->wait);
2621 list_del_init(&ps->list);
2622 if (ps->discsignr) {
2623 memset(&sinfo, 0, sizeof(sinfo));
2624 sinfo.si_signo = ps->discsignr;
2625 sinfo.si_errno = EPIPE;
2626 sinfo.si_code = SI_ASYNCIO;
2627 sinfo.si_addr = ps->disccontext;
2628 kill_pid_info_as_cred(ps->discsignr, &sinfo,
2629 ps->disc_pid, ps->cred, ps->secid);
2630 }
2631 }
2632}
2633
2634static int usbdev_notify(struct notifier_block *self,
2635 unsigned long action, void *dev)
2636{
2637 switch (action) {
2638 case USB_DEVICE_ADD:
2639 break;
2640 case USB_DEVICE_REMOVE:
2641 usbdev_remove(dev);
2642 break;
2643 }
2644 return NOTIFY_OK;
2645}
2646
2647static struct notifier_block usbdev_nb = {
2648 .notifier_call = usbdev_notify,
2649};
2650
2651static struct cdev usb_device_cdev;
2652
2653int __init usb_devio_init(void)
2654{
2655 int retval;
2656
2657 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2658 "usb_device");
2659 if (retval) {
2660 printk(KERN_ERR "Unable to register minors for usb_device\n");
2661 goto out;
2662 }
2663 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2664 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2665 if (retval) {
2666 printk(KERN_ERR "Unable to get usb_device major %d\n",
2667 USB_DEVICE_MAJOR);
2668 goto error_cdev;
2669 }
2670 usb_register_notify(&usbdev_nb);
2671out:
2672 return retval;
2673
2674error_cdev:
2675 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2676 goto out;
2677}
2678
2679void usb_devio_cleanup(void)
2680{
2681 usb_unregister_notify(&usbdev_nb);
2682 cdev_del(&usb_device_cdev);
2683 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2684}