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buffer flushing
[cor_2_6_31.git] / drivers / usb / core / devio.c
blob38b8bce782d6d12cbcb01a8b83452948e48570f7
1 /*****************************************************************************/
2
3 /*
4 * devio.c -- User space communication with USB devices.
5 *
6 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 * This file implements the usbfs/x/y files, where
23 * x is the bus number and y the device number.
24 *
25 * It allows user space programs/"drivers" to communicate directly
26 * with USB devices without intervening kernel driver.
27 *
28 * Revision history
29 * 22.12.1999 0.1 Initial release (split from proc_usb.c)
30 * 04.01.2000 0.2 Turned into its own filesystem
31 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
32 * (CAN-2005-3055)
33 */
34
35 /*****************************************************************************/
36
37 #include <linux/fs.h>
38 #include <linux/mm.h>
39 #include <linux/slab.h>
40 #include <linux/smp_lock.h>
41 #include <linux/signal.h>
42 #include <linux/poll.h>
43 #include <linux/module.h>
44 #include <linux/usb.h>
45 #include <linux/usbdevice_fs.h>
46 #include <linux/cdev.h>
47 #include <linux/notifier.h>
48 #include <linux/security.h>
49 #include <asm/uaccess.h>
50 #include <asm/byteorder.h>
51 #include <linux/moduleparam.h>
52
53 #include "hcd.h" /* for usbcore internals */
54 #include "usb.h"
55
56 #define USB_MAXBUS 64
57 #define USB_DEVICE_MAX USB_MAXBUS * 128
58
59 /* Mutual exclusion for removal, open, and release */
60 DEFINE_MUTEX(usbfs_mutex);
61
62 struct dev_state {
63 struct list_head list; /* state list */
64 struct usb_device *dev;
65 struct file *file;
66 spinlock_t lock; /* protects the async urb lists */
67 struct list_head async_pending;
68 struct list_head async_completed;
69 wait_queue_head_t wait; /* wake up if a request completed */
70 unsigned int discsignr;
71 struct pid *disc_pid;
72 uid_t disc_uid, disc_euid;
73 void __user *disccontext;
74 unsigned long ifclaimed;
75 u32 secid;
76 };
77
78 struct async {
79 struct list_head asynclist;
80 struct dev_state *ps;
81 struct pid *pid;
82 uid_t uid, euid;
83 unsigned int signr;
84 unsigned int ifnum;
85 void __user *userbuffer;
86 void __user *userurb;
87 struct urb *urb;
88 int status;
89 u32 secid;
90 };
91
92 static int usbfs_snoop;
93 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
94 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
95
96 #define snoop(dev, format, arg...) \
97 do { \
98 if (usbfs_snoop) \
99 dev_info(dev , format , ## arg); \
100 } while (0)
101
102 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
103
104
105 #define MAX_USBFS_BUFFER_SIZE 16384
106
107 static int connected(struct dev_state *ps)
108 {
109 return (!list_empty(&ps->list) &&
110 ps->dev->state != USB_STATE_NOTATTACHED);
111 }
112
113 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
114 {
115 loff_t ret;
116
117 lock_kernel();
118
119 switch (orig) {
120 case 0:
121 file->f_pos = offset;
122 ret = file->f_pos;
123 break;
124 case 1:
125 file->f_pos += offset;
126 ret = file->f_pos;
127 break;
128 case 2:
129 default:
130 ret = -EINVAL;
131 }
132
133 unlock_kernel();
134 return ret;
135 }
136
137 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
138 loff_t *ppos)
139 {
140 struct dev_state *ps = file->private_data;
141 struct usb_device *dev = ps->dev;
142 ssize_t ret = 0;
143 unsigned len;
144 loff_t pos;
145 int i;
146
147 pos = *ppos;
148 usb_lock_device(dev);
149 if (!connected(ps)) {
150 ret = -ENODEV;
151 goto err;
152 } else if (pos < 0) {
153 ret = -EINVAL;
154 goto err;
155 }
156
157 if (pos < sizeof(struct usb_device_descriptor)) {
158 /* 18 bytes - fits on the stack */
159 struct usb_device_descriptor temp_desc;
160
161 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
162 le16_to_cpus(&temp_desc.bcdUSB);
163 le16_to_cpus(&temp_desc.idVendor);
164 le16_to_cpus(&temp_desc.idProduct);
165 le16_to_cpus(&temp_desc.bcdDevice);
166
167 len = sizeof(struct usb_device_descriptor) - pos;
168 if (len > nbytes)
169 len = nbytes;
170 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
171 ret = -EFAULT;
172 goto err;
173 }
174
175 *ppos += len;
176 buf += len;
177 nbytes -= len;
178 ret += len;
179 }
180
181 pos = sizeof(struct usb_device_descriptor);
182 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
183 struct usb_config_descriptor *config =
184 (struct usb_config_descriptor *)dev->rawdescriptors[i];
185 unsigned int length = le16_to_cpu(config->wTotalLength);
186
187 if (*ppos < pos + length) {
188
189 /* The descriptor may claim to be longer than it
190 * really is. Here is the actual allocated length. */
191 unsigned alloclen =
192 le16_to_cpu(dev->config[i].desc.wTotalLength);
193
194 len = length - (*ppos - pos);
195 if (len > nbytes)
196 len = nbytes;
197
198 /* Simply don't write (skip over) unallocated parts */
199 if (alloclen > (*ppos - pos)) {
200 alloclen -= (*ppos - pos);
201 if (copy_to_user(buf,
202 dev->rawdescriptors[i] + (*ppos - pos),
203 min(len, alloclen))) {
204 ret = -EFAULT;
205 goto err;
206 }
207 }
208
209 *ppos += len;
210 buf += len;
211 nbytes -= len;
212 ret += len;
213 }
214
215 pos += length;
216 }
217
218 err:
219 usb_unlock_device(dev);
220 return ret;
221 }
222
223 /*
224 * async list handling
225 */
226
227 static struct async *alloc_async(unsigned int numisoframes)
228 {
229 struct async *as;
230
231 as = kzalloc(sizeof(struct async), GFP_KERNEL);
232 if (!as)
233 return NULL;
234 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
235 if (!as->urb) {
236 kfree(as);
237 return NULL;
238 }
239 return as;
240 }
241
242 static void free_async(struct async *as)
243 {
244 put_pid(as->pid);
245 kfree(as->urb->transfer_buffer);
246 kfree(as->urb->setup_packet);
247 usb_free_urb(as->urb);
248 kfree(as);
249 }
250
251 static void async_newpending(struct async *as)
252 {
253 struct dev_state *ps = as->ps;
254 unsigned long flags;
255
256 spin_lock_irqsave(&ps->lock, flags);
257 list_add_tail(&as->asynclist, &ps->async_pending);
258 spin_unlock_irqrestore(&ps->lock, flags);
259 }
260
261 static void async_removepending(struct async *as)
262 {
263 struct dev_state *ps = as->ps;
264 unsigned long flags;
265
266 spin_lock_irqsave(&ps->lock, flags);
267 list_del_init(&as->asynclist);
268 spin_unlock_irqrestore(&ps->lock, flags);
269 }
270
271 static struct async *async_getcompleted(struct dev_state *ps)
272 {
273 unsigned long flags;
274 struct async *as = NULL;
275
276 spin_lock_irqsave(&ps->lock, flags);
277 if (!list_empty(&ps->async_completed)) {
278 as = list_entry(ps->async_completed.next, struct async,
279 asynclist);
280 list_del_init(&as->asynclist);
281 }
282 spin_unlock_irqrestore(&ps->lock, flags);
283 return as;
284 }
285
286 static struct async *async_getpending(struct dev_state *ps,
287 void __user *userurb)
288 {
289 unsigned long flags;
290 struct async *as;
291
292 spin_lock_irqsave(&ps->lock, flags);
293 list_for_each_entry(as, &ps->async_pending, asynclist)
294 if (as->userurb == userurb) {
295 list_del_init(&as->asynclist);
296 spin_unlock_irqrestore(&ps->lock, flags);
297 return as;
298 }
299 spin_unlock_irqrestore(&ps->lock, flags);
300 return NULL;
301 }
302
303 static void snoop_urb(struct urb *urb, void __user *userurb)
304 {
305 unsigned j;
306 unsigned char *data = urb->transfer_buffer;
307
308 if (!usbfs_snoop)
309 return;
310
311 dev_info(&urb->dev->dev, "direction=%s\n",
312 usb_urb_dir_in(urb) ? "IN" : "OUT");
313 dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
314 dev_info(&urb->dev->dev, "transfer_buffer_length=%u\n",
315 urb->transfer_buffer_length);
316 dev_info(&urb->dev->dev, "actual_length=%u\n", urb->actual_length);
317 dev_info(&urb->dev->dev, "data: ");
318 for (j = 0; j < urb->transfer_buffer_length; ++j)
319 printk("%02x ", data[j]);
320 printk("\n");
321 }
322
323 static void async_completed(struct urb *urb)
324 {
325 struct async *as = urb->context;
326 struct dev_state *ps = as->ps;
327 struct siginfo sinfo;
328 struct pid *pid = NULL;
329 uid_t uid = 0;
330 uid_t euid = 0;
331 u32 secid = 0;
332 int signr;
333
334 spin_lock(&ps->lock);
335 list_move_tail(&as->asynclist, &ps->async_completed);
336 as->status = urb->status;
337 signr = as->signr;
338 if (signr) {
339 sinfo.si_signo = as->signr;
340 sinfo.si_errno = as->status;
341 sinfo.si_code = SI_ASYNCIO;
342 sinfo.si_addr = as->userurb;
343 pid = as->pid;
344 uid = as->uid;
345 euid = as->euid;
346 secid = as->secid;
347 }
348 snoop(&urb->dev->dev, "urb complete\n");
349 snoop_urb(urb, as->userurb);
350 spin_unlock(&ps->lock);
351
352 if (signr)
353 kill_pid_info_as_uid(sinfo.si_signo, &sinfo, pid, uid,
354 euid, secid);
355
356 wake_up(&ps->wait);
357 }
358
359 static void destroy_async(struct dev_state *ps, struct list_head *list)
360 {
361 struct async *as;
362 unsigned long flags;
363
364 spin_lock_irqsave(&ps->lock, flags);
365 while (!list_empty(list)) {
366 as = list_entry(list->next, struct async, asynclist);
367 list_del_init(&as->asynclist);
368
369 /* drop the spinlock so the completion handler can run */
370 spin_unlock_irqrestore(&ps->lock, flags);
371 usb_kill_urb(as->urb);
372 spin_lock_irqsave(&ps->lock, flags);
373 }
374 spin_unlock_irqrestore(&ps->lock, flags);
375 }
376
377 static void destroy_async_on_interface(struct dev_state *ps,
378 unsigned int ifnum)
379 {
380 struct list_head *p, *q, hitlist;
381 unsigned long flags;
382
383 INIT_LIST_HEAD(&hitlist);
384 spin_lock_irqsave(&ps->lock, flags);
385 list_for_each_safe(p, q, &ps->async_pending)
386 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
387 list_move_tail(p, &hitlist);
388 spin_unlock_irqrestore(&ps->lock, flags);
389 destroy_async(ps, &hitlist);
390 }
391
392 static void destroy_all_async(struct dev_state *ps)
393 {
394 destroy_async(ps, &ps->async_pending);
395 }
396
397 /*
398 * interface claims are made only at the request of user level code,
399 * which can also release them (explicitly or by closing files).
400 * they're also undone when devices disconnect.
401 */
402
403 static int driver_probe(struct usb_interface *intf,
404 const struct usb_device_id *id)
405 {
406 return -ENODEV;
407 }
408
409 static void driver_disconnect(struct usb_interface *intf)
410 {
411 struct dev_state *ps = usb_get_intfdata(intf);
412 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
413
414 if (!ps)
415 return;
416
417 /* NOTE: this relies on usbcore having canceled and completed
418 * all pending I/O requests; 2.6 does that.
419 */
420
421 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
422 clear_bit(ifnum, &ps->ifclaimed);
423 else
424 dev_warn(&intf->dev, "interface number %u out of range\n",
425 ifnum);
426
427 usb_set_intfdata(intf, NULL);
428
429 /* force async requests to complete */
430 destroy_async_on_interface(ps, ifnum);
431 }
432
433 /* The following routines are merely placeholders. There is no way
434 * to inform a user task about suspend or resumes.
435 */
436 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
437 {
438 return 0;
439 }
440
441 static int driver_resume(struct usb_interface *intf)
442 {
443 return 0;
444 }
445
446 struct usb_driver usbfs_driver = {
447 .name = "usbfs",
448 .probe = driver_probe,
449 .disconnect = driver_disconnect,
450 .suspend = driver_suspend,
451 .resume = driver_resume,
452 };
453
454 static int claimintf(struct dev_state *ps, unsigned int ifnum)
455 {
456 struct usb_device *dev = ps->dev;
457 struct usb_interface *intf;
458 int err;
459
460 if (ifnum >= 8*sizeof(ps->ifclaimed))
461 return -EINVAL;
462 /* already claimed */
463 if (test_bit(ifnum, &ps->ifclaimed))
464 return 0;
465
466 intf = usb_ifnum_to_if(dev, ifnum);
467 if (!intf)
468 err = -ENOENT;
469 else
470 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
471 if (err == 0)
472 set_bit(ifnum, &ps->ifclaimed);
473 return err;
474 }
475
476 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
477 {
478 struct usb_device *dev;
479 struct usb_interface *intf;
480 int err;
481
482 err = -EINVAL;
483 if (ifnum >= 8*sizeof(ps->ifclaimed))
484 return err;
485 dev = ps->dev;
486 intf = usb_ifnum_to_if(dev, ifnum);
487 if (!intf)
488 err = -ENOENT;
489 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
490 usb_driver_release_interface(&usbfs_driver, intf);
491 err = 0;
492 }
493 return err;
494 }
495
496 static int checkintf(struct dev_state *ps, unsigned int ifnum)
497 {
498 if (ps->dev->state != USB_STATE_CONFIGURED)
499 return -EHOSTUNREACH;
500 if (ifnum >= 8*sizeof(ps->ifclaimed))
501 return -EINVAL;
502 if (test_bit(ifnum, &ps->ifclaimed))
503 return 0;
504 /* if not yet claimed, claim it for the driver */
505 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
506 "interface %u before use\n", task_pid_nr(current),
507 current->comm, ifnum);
508 return claimintf(ps, ifnum);
509 }
510
511 static int findintfep(struct usb_device *dev, unsigned int ep)
512 {
513 unsigned int i, j, e;
514 struct usb_interface *intf;
515 struct usb_host_interface *alts;
516 struct usb_endpoint_descriptor *endpt;
517
518 if (ep & ~(USB_DIR_IN|0xf))
519 return -EINVAL;
520 if (!dev->actconfig)
521 return -ESRCH;
522 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
523 intf = dev->actconfig->interface[i];
524 for (j = 0; j < intf->num_altsetting; j++) {
525 alts = &intf->altsetting[j];
526 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
527 endpt = &alts->endpoint[e].desc;
528 if (endpt->bEndpointAddress == ep)
529 return alts->desc.bInterfaceNumber;
530 }
531 }
532 }
533 return -ENOENT;
534 }
535
536 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
537 unsigned int index)
538 {
539 int ret = 0;
540
541 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
542 && ps->dev->state != USB_STATE_ADDRESS
543 && ps->dev->state != USB_STATE_CONFIGURED)
544 return -EHOSTUNREACH;
545 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
546 return 0;
547
548 index &= 0xff;
549 switch (requesttype & USB_RECIP_MASK) {
550 case USB_RECIP_ENDPOINT:
551 ret = findintfep(ps->dev, index);
552 if (ret >= 0)
553 ret = checkintf(ps, ret);
554 break;
555
556 case USB_RECIP_INTERFACE:
557 ret = checkintf(ps, index);
558 break;
559 }
560 return ret;
561 }
562
563 static int match_devt(struct device *dev, void *data)
564 {
565 return dev->devt == (dev_t) (unsigned long) data;
566 }
567
568 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
569 {
570 struct device *dev;
571
572 dev = bus_find_device(&usb_bus_type, NULL,
573 (void *) (unsigned long) devt, match_devt);
574 if (!dev)
575 return NULL;
576 return container_of(dev, struct usb_device, dev);
577 }
578
579 /*
580 * file operations
581 */
582 static int usbdev_open(struct inode *inode, struct file *file)
583 {
584 struct usb_device *dev = NULL;
585 struct dev_state *ps;
586 const struct cred *cred = current_cred();
587 int ret;
588
589 lock_kernel();
590 /* Protect against simultaneous removal or release */
591 mutex_lock(&usbfs_mutex);
592
593 ret = -ENOMEM;
594 ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
595 if (!ps)
596 goto out;
597
598 ret = -ENOENT;
599
600 /* usbdev device-node */
601 if (imajor(inode) == USB_DEVICE_MAJOR)
602 dev = usbdev_lookup_by_devt(inode->i_rdev);
603 #ifdef CONFIG_USB_DEVICEFS
604 /* procfs file */
605 if (!dev) {
606 dev = inode->i_private;
607 if (dev && dev->usbfs_dentry &&
608 dev->usbfs_dentry->d_inode == inode)
609 usb_get_dev(dev);
610 else
611 dev = NULL;
612 }
613 #endif
614 if (!dev || dev->state == USB_STATE_NOTATTACHED)
615 goto out;
616 ret = usb_autoresume_device(dev);
617 if (ret)
618 goto out;
619
620 ret = 0;
621 ps->dev = dev;
622 ps->file = file;
623 spin_lock_init(&ps->lock);
624 INIT_LIST_HEAD(&ps->list);
625 INIT_LIST_HEAD(&ps->async_pending);
626 INIT_LIST_HEAD(&ps->async_completed);
627 init_waitqueue_head(&ps->wait);
628 ps->discsignr = 0;
629 ps->disc_pid = get_pid(task_pid(current));
630 ps->disc_uid = cred->uid;
631 ps->disc_euid = cred->euid;
632 ps->disccontext = NULL;
633 ps->ifclaimed = 0;
634 security_task_getsecid(current, &ps->secid);
635 smp_wmb();
636 list_add_tail(&ps->list, &dev->filelist);
637 file->private_data = ps;
638 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
639 current->comm);
640 out:
641 if (ret) {
642 kfree(ps);
643 usb_put_dev(dev);
644 }
645 mutex_unlock(&usbfs_mutex);
646 unlock_kernel();
647 return ret;
648 }
649
650 static int usbdev_release(struct inode *inode, struct file *file)
651 {
652 struct dev_state *ps = file->private_data;
653 struct usb_device *dev = ps->dev;
654 unsigned int ifnum;
655 struct async *as;
656
657 usb_lock_device(dev);
658
659 /* Protect against simultaneous open */
660 mutex_lock(&usbfs_mutex);
661 list_del_init(&ps->list);
662 mutex_unlock(&usbfs_mutex);
663
664 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
665 ifnum++) {
666 if (test_bit(ifnum, &ps->ifclaimed))
667 releaseintf(ps, ifnum);
668 }
669 destroy_all_async(ps);
670 usb_autosuspend_device(dev);
671 usb_unlock_device(dev);
672 usb_put_dev(dev);
673 put_pid(ps->disc_pid);
674
675 as = async_getcompleted(ps);
676 while (as) {
677 free_async(as);
678 as = async_getcompleted(ps);
679 }
680 kfree(ps);
681 return 0;
682 }
683
684 static int proc_control(struct dev_state *ps, void __user *arg)
685 {
686 struct usb_device *dev = ps->dev;
687 struct usbdevfs_ctrltransfer ctrl;
688 unsigned int tmo;
689 unsigned char *tbuf;
690 unsigned wLength;
691 int i, j, ret;
692
693 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
694 return -EFAULT;
695 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
696 if (ret)
697 return ret;
698 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
699 if (wLength > PAGE_SIZE)
700 return -EINVAL;
701 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
702 if (!tbuf)
703 return -ENOMEM;
704 tmo = ctrl.timeout;
705 if (ctrl.bRequestType & 0x80) {
706 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
707 ctrl.wLength)) {
708 free_page((unsigned long)tbuf);
709 return -EINVAL;
710 }
711 snoop(&dev->dev, "control read: bRequest=%02x "
712 "bRrequestType=%02x wValue=%04x "
713 "wIndex=%04x wLength=%04x\n",
714 ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
715 ctrl.wIndex, ctrl.wLength);
716
717 usb_unlock_device(dev);
718 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest,
719 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
720 tbuf, ctrl.wLength, tmo);
721 usb_lock_device(dev);
722 if ((i > 0) && ctrl.wLength) {
723 if (usbfs_snoop) {
724 dev_info(&dev->dev, "control read: data ");
725 for (j = 0; j < i; ++j)
726 printk("%02x ", (u8)(tbuf)[j]);
727 printk("\n");
728 }
729 if (copy_to_user(ctrl.data, tbuf, i)) {
730 free_page((unsigned long)tbuf);
731 return -EFAULT;
732 }
733 }
734 } else {
735 if (ctrl.wLength) {
736 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
737 free_page((unsigned long)tbuf);
738 return -EFAULT;
739 }
740 }
741 snoop(&dev->dev, "control write: bRequest=%02x "
742 "bRrequestType=%02x wValue=%04x "
743 "wIndex=%04x wLength=%04x\n",
744 ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
745 ctrl.wIndex, ctrl.wLength);
746 if (usbfs_snoop) {
747 dev_info(&dev->dev, "control write: data: ");
748 for (j = 0; j < ctrl.wLength; ++j)
749 printk("%02x ", (unsigned char)(tbuf)[j]);
750 printk("\n");
751 }
752 usb_unlock_device(dev);
753 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
754 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
755 tbuf, ctrl.wLength, tmo);
756 usb_lock_device(dev);
757 }
758 free_page((unsigned long)tbuf);
759 if (i < 0 && i != -EPIPE) {
760 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
761 "failed cmd %s rqt %u rq %u len %u ret %d\n",
762 current->comm, ctrl.bRequestType, ctrl.bRequest,
763 ctrl.wLength, i);
764 }
765 return i;
766 }
767
768 static int proc_bulk(struct dev_state *ps, void __user *arg)
769 {
770 struct usb_device *dev = ps->dev;
771 struct usbdevfs_bulktransfer bulk;
772 unsigned int tmo, len1, pipe;
773 int len2;
774 unsigned char *tbuf;
775 int i, j, ret;
776
777 if (copy_from_user(&bulk, arg, sizeof(bulk)))
778 return -EFAULT;
779 ret = findintfep(ps->dev, bulk.ep);
780 if (ret < 0)
781 return ret;
782 ret = checkintf(ps, ret);
783 if (ret)
784 return ret;
785 if (bulk.ep & USB_DIR_IN)
786 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
787 else
788 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
789 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
790 return -EINVAL;
791 len1 = bulk.len;
792 if (len1 > MAX_USBFS_BUFFER_SIZE)
793 return -EINVAL;
794 if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
795 return -ENOMEM;
796 tmo = bulk.timeout;
797 if (bulk.ep & 0x80) {
798 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
799 kfree(tbuf);
800 return -EINVAL;
801 }
802 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
803 bulk.len, bulk.timeout);
804 usb_unlock_device(dev);
805 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
806 usb_lock_device(dev);
807 if (!i && len2) {
808 if (usbfs_snoop) {
809 dev_info(&dev->dev, "bulk read: data ");
810 for (j = 0; j < len2; ++j)
811 printk("%02x ", (u8)(tbuf)[j]);
812 printk("\n");
813 }
814 if (copy_to_user(bulk.data, tbuf, len2)) {
815 kfree(tbuf);
816 return -EFAULT;
817 }
818 }
819 } else {
820 if (len1) {
821 if (copy_from_user(tbuf, bulk.data, len1)) {
822 kfree(tbuf);
823 return -EFAULT;
824 }
825 }
826 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
827 bulk.len, bulk.timeout);
828 if (usbfs_snoop) {
829 dev_info(&dev->dev, "bulk write: data: ");
830 for (j = 0; j < len1; ++j)
831 printk("%02x ", (unsigned char)(tbuf)[j]);
832 printk("\n");
833 }
834 usb_unlock_device(dev);
835 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
836 usb_lock_device(dev);
837 }
838 kfree(tbuf);
839 if (i < 0)
840 return i;
841 return len2;
842 }
843
844 static int proc_resetep(struct dev_state *ps, void __user *arg)
845 {
846 unsigned int ep;
847 int ret;
848
849 if (get_user(ep, (unsigned int __user *)arg))
850 return -EFAULT;
851 ret = findintfep(ps->dev, ep);
852 if (ret < 0)
853 return ret;
854 ret = checkintf(ps, ret);
855 if (ret)
856 return ret;
857 usb_reset_endpoint(ps->dev, ep);
858 return 0;
859 }
860
861 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
862 {
863 unsigned int ep;
864 int pipe;
865 int ret;
866
867 if (get_user(ep, (unsigned int __user *)arg))
868 return -EFAULT;
869 ret = findintfep(ps->dev, ep);
870 if (ret < 0)
871 return ret;
872 ret = checkintf(ps, ret);
873 if (ret)
874 return ret;
875 if (ep & USB_DIR_IN)
876 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
877 else
878 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
879
880 return usb_clear_halt(ps->dev, pipe);
881 }
882
883 static int proc_getdriver(struct dev_state *ps, void __user *arg)
884 {
885 struct usbdevfs_getdriver gd;
886 struct usb_interface *intf;
887 int ret;
888
889 if (copy_from_user(&gd, arg, sizeof(gd)))
890 return -EFAULT;
891 intf = usb_ifnum_to_if(ps->dev, gd.interface);
892 if (!intf || !intf->dev.driver)
893 ret = -ENODATA;
894 else {
895 strncpy(gd.driver, intf->dev.driver->name,
896 sizeof(gd.driver));
897 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
898 }
899 return ret;
900 }
901
902 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
903 {
904 struct usbdevfs_connectinfo ci;
905
906 ci.devnum = ps->dev->devnum;
907 ci.slow = ps->dev->speed == USB_SPEED_LOW;
908 if (copy_to_user(arg, &ci, sizeof(ci)))
909 return -EFAULT;
910 return 0;
911 }
912
913 static int proc_resetdevice(struct dev_state *ps)
914 {
915 return usb_reset_device(ps->dev);
916 }
917
918 static int proc_setintf(struct dev_state *ps, void __user *arg)
919 {
920 struct usbdevfs_setinterface setintf;
921 int ret;
922
923 if (copy_from_user(&setintf, arg, sizeof(setintf)))
924 return -EFAULT;
925 if ((ret = checkintf(ps, setintf.interface)))
926 return ret;
927 return usb_set_interface(ps->dev, setintf.interface,
928 setintf.altsetting);
929 }
930
931 static int proc_setconfig(struct dev_state *ps, void __user *arg)
932 {
933 int u;
934 int status = 0;
935 struct usb_host_config *actconfig;
936
937 if (get_user(u, (int __user *)arg))
938 return -EFAULT;
939
940 actconfig = ps->dev->actconfig;
941
942 /* Don't touch the device if any interfaces are claimed.
943 * It could interfere with other drivers' operations, and if
944 * an interface is claimed by usbfs it could easily deadlock.
945 */
946 if (actconfig) {
947 int i;
948
949 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
950 if (usb_interface_claimed(actconfig->interface[i])) {
951 dev_warn(&ps->dev->dev,
952 "usbfs: interface %d claimed by %s "
953 "while '%s' sets config #%d\n",
954 actconfig->interface[i]
955 ->cur_altsetting
956 ->desc.bInterfaceNumber,
957 actconfig->interface[i]
958 ->dev.driver->name,
959 current->comm, u);
960 status = -EBUSY;
961 break;
962 }
963 }
964 }
965
966 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
967 * so avoid usb_set_configuration()'s kick to sysfs
968 */
969 if (status == 0) {
970 if (actconfig && actconfig->desc.bConfigurationValue == u)
971 status = usb_reset_configuration(ps->dev);
972 else
973 status = usb_set_configuration(ps->dev, u);
974 }
975
976 return status;
977 }
978
979 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
980 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
981 void __user *arg)
982 {
983 struct usbdevfs_iso_packet_desc *isopkt = NULL;
984 struct usb_host_endpoint *ep;
985 struct async *as;
986 struct usb_ctrlrequest *dr = NULL;
987 const struct cred *cred = current_cred();
988 unsigned int u, totlen, isofrmlen;
989 int ret, ifnum = -1;
990 int is_in;
991
992 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
993 USBDEVFS_URB_SHORT_NOT_OK |
994 USBDEVFS_URB_NO_FSBR |
995 USBDEVFS_URB_ZERO_PACKET |
996 USBDEVFS_URB_NO_INTERRUPT))
997 return -EINVAL;
998 if (uurb->buffer_length > 0 && !uurb->buffer)
999 return -EINVAL;
1000 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1001 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1002 ifnum = findintfep(ps->dev, uurb->endpoint);
1003 if (ifnum < 0)
1004 return ifnum;
1005 ret = checkintf(ps, ifnum);
1006 if (ret)
1007 return ret;
1008 }
1009 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1010 is_in = 1;
1011 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1012 } else {
1013 is_in = 0;
1014 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1015 }
1016 if (!ep)
1017 return -ENOENT;
1018 switch(uurb->type) {
1019 case USBDEVFS_URB_TYPE_CONTROL:
1020 if (!usb_endpoint_xfer_control(&ep->desc))
1021 return -EINVAL;
1022 /* min 8 byte setup packet,
1023 * max 8 byte setup plus an arbitrary data stage */
1024 if (uurb->buffer_length < 8 ||
1025 uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1026 return -EINVAL;
1027 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1028 if (!dr)
1029 return -ENOMEM;
1030 if (copy_from_user(dr, uurb->buffer, 8)) {
1031 kfree(dr);
1032 return -EFAULT;
1033 }
1034 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1035 kfree(dr);
1036 return -EINVAL;
1037 }
1038 ret = check_ctrlrecip(ps, dr->bRequestType,
1039 le16_to_cpup(&dr->wIndex));
1040 if (ret) {
1041 kfree(dr);
1042 return ret;
1043 }
1044 uurb->number_of_packets = 0;
1045 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1046 uurb->buffer += 8;
1047 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1048 is_in = 1;
1049 uurb->endpoint |= USB_DIR_IN;
1050 } else {
1051 is_in = 0;
1052 uurb->endpoint &= ~USB_DIR_IN;
1053 }
1054 snoop(&ps->dev->dev, "control urb: bRequest=%02x "
1055 "bRrequestType=%02x wValue=%04x "
1056 "wIndex=%04x wLength=%04x\n",
1057 dr->bRequest, dr->bRequestType,
1058 __le16_to_cpup(&dr->wValue),
1059 __le16_to_cpup(&dr->wIndex),
1060 __le16_to_cpup(&dr->wLength));
1061 break;
1062
1063 case USBDEVFS_URB_TYPE_BULK:
1064 switch (usb_endpoint_type(&ep->desc)) {
1065 case USB_ENDPOINT_XFER_CONTROL:
1066 case USB_ENDPOINT_XFER_ISOC:
1067 return -EINVAL;
1068 /* allow single-shot interrupt transfers, at bogus rates */
1069 }
1070 uurb->number_of_packets = 0;
1071 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1072 return -EINVAL;
1073 snoop(&ps->dev->dev, "bulk urb\n");
1074 break;
1075
1076 case USBDEVFS_URB_TYPE_ISO:
1077 /* arbitrary limit */
1078 if (uurb->number_of_packets < 1 ||
1079 uurb->number_of_packets > 128)
1080 return -EINVAL;
1081 if (!usb_endpoint_xfer_isoc(&ep->desc))
1082 return -EINVAL;
1083 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1084 uurb->number_of_packets;
1085 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1086 return -ENOMEM;
1087 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1088 kfree(isopkt);
1089 return -EFAULT;
1090 }
1091 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1092 /* arbitrary limit,
1093 * sufficient for USB 2.0 high-bandwidth iso */
1094 if (isopkt[u].length > 8192) {
1095 kfree(isopkt);
1096 return -EINVAL;
1097 }
1098 totlen += isopkt[u].length;
1099 }
1100 if (totlen > 32768) {
1101 kfree(isopkt);
1102 return -EINVAL;
1103 }
1104 uurb->buffer_length = totlen;
1105 snoop(&ps->dev->dev, "iso urb\n");
1106 break;
1107
1108 case USBDEVFS_URB_TYPE_INTERRUPT:
1109 uurb->number_of_packets = 0;
1110 if (!usb_endpoint_xfer_int(&ep->desc))
1111 return -EINVAL;
1112 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1113 return -EINVAL;
1114 snoop(&ps->dev->dev, "interrupt urb\n");
1115 break;
1116
1117 default:
1118 return -EINVAL;
1119 }
1120 if (uurb->buffer_length > 0 &&
1121 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1122 uurb->buffer, uurb->buffer_length)) {
1123 kfree(isopkt);
1124 kfree(dr);
1125 return -EFAULT;
1126 }
1127 as = alloc_async(uurb->number_of_packets);
1128 if (!as) {
1129 kfree(isopkt);
1130 kfree(dr);
1131 return -ENOMEM;
1132 }
1133 if (uurb->buffer_length > 0) {
1134 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1135 GFP_KERNEL);
1136 if (!as->urb->transfer_buffer) {
1137 kfree(isopkt);
1138 kfree(dr);
1139 free_async(as);
1140 return -ENOMEM;
1141 }
1142 }
1143 as->urb->dev = ps->dev;
1144 as->urb->pipe = (uurb->type << 30) |
1145 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1146 (uurb->endpoint & USB_DIR_IN);
1147
1148 /* This tedious sequence is necessary because the URB_* flags
1149 * are internal to the kernel and subject to change, whereas
1150 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1151 */
1152 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1153 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1154 u |= URB_ISO_ASAP;
1155 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1156 u |= URB_SHORT_NOT_OK;
1157 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1158 u |= URB_NO_FSBR;
1159 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1160 u |= URB_ZERO_PACKET;
1161 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1162 u |= URB_NO_INTERRUPT;
1163 as->urb->transfer_flags = u;
1164
1165 as->urb->transfer_buffer_length = uurb->buffer_length;
1166 as->urb->setup_packet = (unsigned char *)dr;
1167 as->urb->start_frame = uurb->start_frame;
1168 as->urb->number_of_packets = uurb->number_of_packets;
1169 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1170 ps->dev->speed == USB_SPEED_HIGH)
1171 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1172 else
1173 as->urb->interval = ep->desc.bInterval;
1174 as->urb->context = as;
1175 as->urb->complete = async_completed;
1176 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1177 as->urb->iso_frame_desc[u].offset = totlen;
1178 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1179 totlen += isopkt[u].length;
1180 }
1181 kfree(isopkt);
1182 as->ps = ps;
1183 as->userurb = arg;
1184 if (is_in && uurb->buffer_length > 0)
1185 as->userbuffer = uurb->buffer;
1186 else
1187 as->userbuffer = NULL;
1188 as->signr = uurb->signr;
1189 as->ifnum = ifnum;
1190 as->pid = get_pid(task_pid(current));
1191 as->uid = cred->uid;
1192 as->euid = cred->euid;
1193 security_task_getsecid(current, &as->secid);
1194 if (!is_in && uurb->buffer_length > 0) {
1195 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1196 uurb->buffer_length)) {
1197 free_async(as);
1198 return -EFAULT;
1199 }
1200 }
1201 snoop_urb(as->urb, as->userurb);
1202 async_newpending(as);
1203 if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1204 dev_printk(KERN_DEBUG, &ps->dev->dev,
1205 "usbfs: usb_submit_urb returned %d\n", ret);
1206 async_removepending(as);
1207 free_async(as);
1208 return ret;
1209 }
1210 return 0;
1211 }
1212
1213 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1214 {
1215 struct usbdevfs_urb uurb;
1216
1217 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1218 return -EFAULT;
1219
1220 return proc_do_submiturb(ps, &uurb,
1221 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1222 arg);
1223 }
1224
1225 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1226 {
1227 struct async *as;
1228
1229 as = async_getpending(ps, arg);
1230 if (!as)
1231 return -EINVAL;
1232 usb_kill_urb(as->urb);
1233 return 0;
1234 }
1235
1236 static int processcompl(struct async *as, void __user * __user *arg)
1237 {
1238 struct urb *urb = as->urb;
1239 struct usbdevfs_urb __user *userurb = as->userurb;
1240 void __user *addr = as->userurb;
1241 unsigned int i;
1242
1243 if (as->userbuffer)
1244 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1245 urb->transfer_buffer_length))
1246 goto err_out;
1247 if (put_user(as->status, &userurb->status))
1248 goto err_out;
1249 if (put_user(urb->actual_length, &userurb->actual_length))
1250 goto err_out;
1251 if (put_user(urb->error_count, &userurb->error_count))
1252 goto err_out;
1253
1254 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1255 for (i = 0; i < urb->number_of_packets; i++) {
1256 if (put_user(urb->iso_frame_desc[i].actual_length,
1257 &userurb->iso_frame_desc[i].actual_length))
1258 goto err_out;
1259 if (put_user(urb->iso_frame_desc[i].status,
1260 &userurb->iso_frame_desc[i].status))
1261 goto err_out;
1262 }
1263 }
1264
1265 free_async(as);
1266
1267 if (put_user(addr, (void __user * __user *)arg))
1268 return -EFAULT;
1269 return 0;
1270
1271 err_out:
1272 free_async(as);
1273 return -EFAULT;
1274 }
1275
1276 static struct async *reap_as(struct dev_state *ps)
1277 {
1278 DECLARE_WAITQUEUE(wait, current);
1279 struct async *as = NULL;
1280 struct usb_device *dev = ps->dev;
1281
1282 add_wait_queue(&ps->wait, &wait);
1283 for (;;) {
1284 __set_current_state(TASK_INTERRUPTIBLE);
1285 as = async_getcompleted(ps);
1286 if (as)
1287 break;
1288 if (signal_pending(current))
1289 break;
1290 usb_unlock_device(dev);
1291 schedule();
1292 usb_lock_device(dev);
1293 }
1294 remove_wait_queue(&ps->wait, &wait);
1295 set_current_state(TASK_RUNNING);
1296 return as;
1297 }
1298
1299 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1300 {
1301 struct async *as = reap_as(ps);
1302 if (as)
1303 return processcompl(as, (void __user * __user *)arg);
1304 if (signal_pending(current))
1305 return -EINTR;
1306 return -EIO;
1307 }
1308
1309 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1310 {
1311 struct async *as;
1312
1313 if (!(as = async_getcompleted(ps)))
1314 return -EAGAIN;
1315 return processcompl(as, (void __user * __user *)arg);
1316 }
1317
1318 #ifdef CONFIG_COMPAT
1319
1320 static int get_urb32(struct usbdevfs_urb *kurb,
1321 struct usbdevfs_urb32 __user *uurb)
1322 {
1323 __u32 uptr;
1324 if (get_user(kurb->type, &uurb->type) ||
1325 __get_user(kurb->endpoint, &uurb->endpoint) ||
1326 __get_user(kurb->status, &uurb->status) ||
1327 __get_user(kurb->flags, &uurb->flags) ||
1328 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1329 __get_user(kurb->actual_length, &uurb->actual_length) ||
1330 __get_user(kurb->start_frame, &uurb->start_frame) ||
1331 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1332 __get_user(kurb->error_count, &uurb->error_count) ||
1333 __get_user(kurb->signr, &uurb->signr))
1334 return -EFAULT;
1335
1336 if (__get_user(uptr, &uurb->buffer))
1337 return -EFAULT;
1338 kurb->buffer = compat_ptr(uptr);
1339 if (__get_user(uptr, &uurb->usercontext))
1340 return -EFAULT;
1341 kurb->usercontext = compat_ptr(uptr);
1342
1343 return 0;
1344 }
1345
1346 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1347 {
1348 struct usbdevfs_urb uurb;
1349
1350 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1351 return -EFAULT;
1352
1353 return proc_do_submiturb(ps, &uurb,
1354 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1355 arg);
1356 }
1357
1358 static int processcompl_compat(struct async *as, void __user * __user *arg)
1359 {
1360 struct urb *urb = as->urb;
1361 struct usbdevfs_urb32 __user *userurb = as->userurb;
1362 void __user *addr = as->userurb;
1363 unsigned int i;
1364
1365 if (as->userbuffer)
1366 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1367 urb->transfer_buffer_length))
1368 return -EFAULT;
1369 if (put_user(as->status, &userurb->status))
1370 return -EFAULT;
1371 if (put_user(urb->actual_length, &userurb->actual_length))
1372 return -EFAULT;
1373 if (put_user(urb->error_count, &userurb->error_count))
1374 return -EFAULT;
1375
1376 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1377 for (i = 0; i < urb->number_of_packets; i++) {
1378 if (put_user(urb->iso_frame_desc[i].actual_length,
1379 &userurb->iso_frame_desc[i].actual_length))
1380 return -EFAULT;
1381 if (put_user(urb->iso_frame_desc[i].status,
1382 &userurb->iso_frame_desc[i].status))
1383 return -EFAULT;
1384 }
1385 }
1386
1387 free_async(as);
1388 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1389 return -EFAULT;
1390 return 0;
1391 }
1392
1393 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1394 {
1395 struct async *as = reap_as(ps);
1396 if (as)
1397 return processcompl_compat(as, (void __user * __user *)arg);
1398 if (signal_pending(current))
1399 return -EINTR;
1400 return -EIO;
1401 }
1402
1403 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1404 {
1405 struct async *as;
1406
1407 if (!(as = async_getcompleted(ps)))
1408 return -EAGAIN;
1409 return processcompl_compat(as, (void __user * __user *)arg);
1410 }
1411
1412 #endif
1413
1414 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1415 {
1416 struct usbdevfs_disconnectsignal ds;
1417
1418 if (copy_from_user(&ds, arg, sizeof(ds)))
1419 return -EFAULT;
1420 ps->discsignr = ds.signr;
1421 ps->disccontext = ds.context;
1422 return 0;
1423 }
1424
1425 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1426 {
1427 unsigned int ifnum;
1428
1429 if (get_user(ifnum, (unsigned int __user *)arg))
1430 return -EFAULT;
1431 return claimintf(ps, ifnum);
1432 }
1433
1434 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1435 {
1436 unsigned int ifnum;
1437 int ret;
1438
1439 if (get_user(ifnum, (unsigned int __user *)arg))
1440 return -EFAULT;
1441 if ((ret = releaseintf(ps, ifnum)) < 0)
1442 return ret;
1443 destroy_async_on_interface (ps, ifnum);
1444 return 0;
1445 }
1446
1447 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1448 {
1449 int size;
1450 void *buf = NULL;
1451 int retval = 0;
1452 struct usb_interface *intf = NULL;
1453 struct usb_driver *driver = NULL;
1454
1455 /* alloc buffer */
1456 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1457 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1458 return -ENOMEM;
1459 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1460 if (copy_from_user(buf, ctl->data, size)) {
1461 kfree(buf);
1462 return -EFAULT;
1463 }
1464 } else {
1465 memset(buf, 0, size);
1466 }
1467 }
1468
1469 if (!connected(ps)) {
1470 kfree(buf);
1471 return -ENODEV;
1472 }
1473
1474 if (ps->dev->state != USB_STATE_CONFIGURED)
1475 retval = -EHOSTUNREACH;
1476 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1477 retval = -EINVAL;
1478 else switch (ctl->ioctl_code) {
1479
1480 /* disconnect kernel driver from interface */
1481 case USBDEVFS_DISCONNECT:
1482 if (intf->dev.driver) {
1483 driver = to_usb_driver(intf->dev.driver);
1484 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1485 usb_driver_release_interface(driver, intf);
1486 } else
1487 retval = -ENODATA;
1488 break;
1489
1490 /* let kernel drivers try to (re)bind to the interface */
1491 case USBDEVFS_CONNECT:
1492 if (!intf->dev.driver)
1493 retval = device_attach(&intf->dev);
1494 else
1495 retval = -EBUSY;
1496 break;
1497
1498 /* talk directly to the interface's driver */
1499 default:
1500 if (intf->dev.driver)
1501 driver = to_usb_driver(intf->dev.driver);
1502 if (driver == NULL || driver->ioctl == NULL) {
1503 retval = -ENOTTY;
1504 } else {
1505 retval = driver->ioctl(intf, ctl->ioctl_code, buf);
1506 if (retval == -ENOIOCTLCMD)
1507 retval = -ENOTTY;
1508 }
1509 }
1510
1511 /* cleanup and return */
1512 if (retval >= 0
1513 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1514 && size > 0
1515 && copy_to_user(ctl->data, buf, size) != 0)
1516 retval = -EFAULT;
1517
1518 kfree(buf);
1519 return retval;
1520 }
1521
1522 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1523 {
1524 struct usbdevfs_ioctl ctrl;
1525
1526 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1527 return -EFAULT;
1528 return proc_ioctl(ps, &ctrl);
1529 }
1530
1531 #ifdef CONFIG_COMPAT
1532 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1533 {
1534 struct usbdevfs_ioctl32 __user *uioc;
1535 struct usbdevfs_ioctl ctrl;
1536 u32 udata;
1537
1538 uioc = compat_ptr((long)arg);
1539 if (get_user(ctrl.ifno, &uioc->ifno) ||
1540 get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1541 __get_user(udata, &uioc->data))
1542 return -EFAULT;
1543 ctrl.data = compat_ptr(udata);
1544
1545 return proc_ioctl(ps, &ctrl);
1546 }
1547 #endif
1548
1549 /*
1550 * NOTE: All requests here that have interface numbers as parameters
1551 * are assuming that somehow the configuration has been prevented from
1552 * changing. But there's no mechanism to ensure that...
1553 */
1554 static int usbdev_ioctl(struct inode *inode, struct file *file,
1555 unsigned int cmd, unsigned long arg)
1556 {
1557 struct dev_state *ps = file->private_data;
1558 struct usb_device *dev = ps->dev;
1559 void __user *p = (void __user *)arg;
1560 int ret = -ENOTTY;
1561
1562 if (!(file->f_mode & FMODE_WRITE))
1563 return -EPERM;
1564 usb_lock_device(dev);
1565 if (!connected(ps)) {
1566 usb_unlock_device(dev);
1567 return -ENODEV;
1568 }
1569
1570 switch (cmd) {
1571 case USBDEVFS_CONTROL:
1572 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1573 ret = proc_control(ps, p);
1574 if (ret >= 0)
1575 inode->i_mtime = CURRENT_TIME;
1576 break;
1577
1578 case USBDEVFS_BULK:
1579 snoop(&dev->dev, "%s: BULK\n", __func__);
1580 ret = proc_bulk(ps, p);
1581 if (ret >= 0)
1582 inode->i_mtime = CURRENT_TIME;
1583 break;
1584
1585 case USBDEVFS_RESETEP:
1586 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1587 ret = proc_resetep(ps, p);
1588 if (ret >= 0)
1589 inode->i_mtime = CURRENT_TIME;
1590 break;
1591
1592 case USBDEVFS_RESET:
1593 snoop(&dev->dev, "%s: RESET\n", __func__);
1594 ret = proc_resetdevice(ps);
1595 break;
1596
1597 case USBDEVFS_CLEAR_HALT:
1598 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1599 ret = proc_clearhalt(ps, p);
1600 if (ret >= 0)
1601 inode->i_mtime = CURRENT_TIME;
1602 break;
1603
1604 case USBDEVFS_GETDRIVER:
1605 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1606 ret = proc_getdriver(ps, p);
1607 break;
1608
1609 case USBDEVFS_CONNECTINFO:
1610 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1611 ret = proc_connectinfo(ps, p);
1612 break;
1613
1614 case USBDEVFS_SETINTERFACE:
1615 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1616 ret = proc_setintf(ps, p);
1617 break;
1618
1619 case USBDEVFS_SETCONFIGURATION:
1620 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1621 ret = proc_setconfig(ps, p);
1622 break;
1623
1624 case USBDEVFS_SUBMITURB:
1625 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1626 ret = proc_submiturb(ps, p);
1627 if (ret >= 0)
1628 inode->i_mtime = CURRENT_TIME;
1629 break;
1630
1631 #ifdef CONFIG_COMPAT
1632
1633 case USBDEVFS_SUBMITURB32:
1634 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1635 ret = proc_submiturb_compat(ps, p);
1636 if (ret >= 0)
1637 inode->i_mtime = CURRENT_TIME;
1638 break;
1639
1640 case USBDEVFS_REAPURB32:
1641 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1642 ret = proc_reapurb_compat(ps, p);
1643 break;
1644
1645 case USBDEVFS_REAPURBNDELAY32:
1646 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __func__);
1647 ret = proc_reapurbnonblock_compat(ps, p);
1648 break;
1649
1650 case USBDEVFS_IOCTL32:
1651 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1652 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1653 break;
1654 #endif
1655
1656 case USBDEVFS_DISCARDURB:
1657 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1658 ret = proc_unlinkurb(ps, p);
1659 break;
1660
1661 case USBDEVFS_REAPURB:
1662 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1663 ret = proc_reapurb(ps, p);
1664 break;
1665
1666 case USBDEVFS_REAPURBNDELAY:
1667 snoop(&dev->dev, "%s: REAPURBDELAY\n", __func__);
1668 ret = proc_reapurbnonblock(ps, p);
1669 break;
1670
1671 case USBDEVFS_DISCSIGNAL:
1672 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1673 ret = proc_disconnectsignal(ps, p);
1674 break;
1675
1676 case USBDEVFS_CLAIMINTERFACE:
1677 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1678 ret = proc_claiminterface(ps, p);
1679 break;
1680
1681 case USBDEVFS_RELEASEINTERFACE:
1682 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1683 ret = proc_releaseinterface(ps, p);
1684 break;
1685
1686 case USBDEVFS_IOCTL:
1687 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1688 ret = proc_ioctl_default(ps, p);
1689 break;
1690 }
1691 usb_unlock_device(dev);
1692 if (ret >= 0)
1693 inode->i_atime = CURRENT_TIME;
1694 return ret;
1695 }
1696
1697 /* No kernel lock - fine */
1698 static unsigned int usbdev_poll(struct file *file,
1699 struct poll_table_struct *wait)
1700 {
1701 struct dev_state *ps = file->private_data;
1702 unsigned int mask = 0;
1703
1704 poll_wait(file, &ps->wait, wait);
1705 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1706 mask |= POLLOUT | POLLWRNORM;
1707 if (!connected(ps))
1708 mask |= POLLERR | POLLHUP;
1709 return mask;
1710 }
1711
1712 const struct file_operations usbdev_file_operations = {
1713 .owner = THIS_MODULE,
1714 .llseek = usbdev_lseek,
1715 .read = usbdev_read,
1716 .poll = usbdev_poll,
1717 .ioctl = usbdev_ioctl,
1718 .open = usbdev_open,
1719 .release = usbdev_release,
1720 };
1721
1722 static void usbdev_remove(struct usb_device *udev)
1723 {
1724 struct dev_state *ps;
1725 struct siginfo sinfo;
1726
1727 while (!list_empty(&udev->filelist)) {
1728 ps = list_entry(udev->filelist.next, struct dev_state, list);
1729 destroy_all_async(ps);
1730 wake_up_all(&ps->wait);
1731 list_del_init(&ps->list);
1732 if (ps->discsignr) {
1733 sinfo.si_signo = ps->discsignr;
1734 sinfo.si_errno = EPIPE;
1735 sinfo.si_code = SI_ASYNCIO;
1736 sinfo.si_addr = ps->disccontext;
1737 kill_pid_info_as_uid(ps->discsignr, &sinfo,
1738 ps->disc_pid, ps->disc_uid,
1739 ps->disc_euid, ps->secid);
1740 }
1741 }
1742 }
1743
1744 #ifdef CONFIG_USB_DEVICE_CLASS
1745 static struct class *usb_classdev_class;
1746
1747 static int usb_classdev_add(struct usb_device *dev)
1748 {
1749 struct device *cldev;
1750
1751 cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
1752 NULL, "usbdev%d.%d", dev->bus->busnum,
1753 dev->devnum);
1754 if (IS_ERR(cldev))
1755 return PTR_ERR(cldev);
1756 dev->usb_classdev = cldev;
1757 return 0;
1758 }
1759
1760 static void usb_classdev_remove(struct usb_device *dev)
1761 {
1762 if (dev->usb_classdev)
1763 device_unregister(dev->usb_classdev);
1764 }
1765
1766 #else
1767 #define usb_classdev_add(dev) 0
1768 #define usb_classdev_remove(dev) do {} while (0)
1769
1770 #endif
1771
1772 static int usbdev_notify(struct notifier_block *self,
1773 unsigned long action, void *dev)
1774 {
1775 switch (action) {
1776 case USB_DEVICE_ADD:
1777 if (usb_classdev_add(dev))
1778 return NOTIFY_BAD;
1779 break;
1780 case USB_DEVICE_REMOVE:
1781 usb_classdev_remove(dev);
1782 usbdev_remove(dev);
1783 break;
1784 }
1785 return NOTIFY_OK;
1786 }
1787
1788 static struct notifier_block usbdev_nb = {
1789 .notifier_call = usbdev_notify,
1790 };
1791
1792 static struct cdev usb_device_cdev;
1793
1794 int __init usb_devio_init(void)
1795 {
1796 int retval;
1797
1798 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1799 "usb_device");
1800 if (retval) {
1801 printk(KERN_ERR "Unable to register minors for usb_device\n");
1802 goto out;
1803 }
1804 cdev_init(&usb_device_cdev, &usbdev_file_operations);
1805 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1806 if (retval) {
1807 printk(KERN_ERR "Unable to get usb_device major %d\n",
1808 USB_DEVICE_MAJOR);
1809 goto error_cdev;
1810 }
1811 #ifdef CONFIG_USB_DEVICE_CLASS
1812 usb_classdev_class = class_create(THIS_MODULE, "usb_device");
1813 if (IS_ERR(usb_classdev_class)) {
1814 printk(KERN_ERR "Unable to register usb_device class\n");
1815 retval = PTR_ERR(usb_classdev_class);
1816 cdev_del(&usb_device_cdev);
1817 usb_classdev_class = NULL;
1818 goto out;
1819 }
1820 /* devices of this class shadow the major:minor of their parent
1821 * device, so clear ->dev_kobj to prevent adding duplicate entries
1822 * to /sys/dev
1823 */
1824 usb_classdev_class->dev_kobj = NULL;
1825 #endif
1826 usb_register_notify(&usbdev_nb);
1827 out:
1828 return retval;
1829
1830 error_cdev:
1831 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1832 goto out;
1833 }
1834
1835 void usb_devio_cleanup(void)
1836 {
1837 usb_unregister_notify(&usbdev_nb);
1838 #ifdef CONFIG_USB_DEVICE_CLASS
1839 class_destroy(usb_classdev_class);
1840 #endif
1841 cdev_del(&usb_device_cdev);
1842 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1843 }
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