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mm owner: fix race between swapoff and exit
[linux-2.6/next.git] / drivers / usb / core / devio.c
blob20290c5b15625c3b4272765ff95eefa3feb07b88
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 inline 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 inline 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 inline 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 inline 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 inline 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 int 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=%d\n",
315 urb->transfer_buffer_length);
316 dev_info(&urb->dev->dev, "actual_length=%d\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
329 spin_lock(&ps->lock);
330 list_move_tail(&as->asynclist, &ps->async_completed);
331 spin_unlock(&ps->lock);
332 as->status = urb->status;
333 if (as->signr) {
334 sinfo.si_signo = as->signr;
335 sinfo.si_errno = as->status;
336 sinfo.si_code = SI_ASYNCIO;
337 sinfo.si_addr = as->userurb;
338 kill_pid_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
339 as->euid, as->secid);
340 }
341 snoop(&urb->dev->dev, "urb complete\n");
342 snoop_urb(urb, as->userurb);
343 wake_up(&ps->wait);
344 }
345
346 static void destroy_async(struct dev_state *ps, struct list_head *list)
347 {
348 struct async *as;
349 unsigned long flags;
350
351 spin_lock_irqsave(&ps->lock, flags);
352 while (!list_empty(list)) {
353 as = list_entry(list->next, struct async, asynclist);
354 list_del_init(&as->asynclist);
355
356 /* drop the spinlock so the completion handler can run */
357 spin_unlock_irqrestore(&ps->lock, flags);
358 usb_kill_urb(as->urb);
359 spin_lock_irqsave(&ps->lock, flags);
360 }
361 spin_unlock_irqrestore(&ps->lock, flags);
362 as = async_getcompleted(ps);
363 while (as) {
364 free_async(as);
365 as = async_getcompleted(ps);
366 }
367 }
368
369 static void destroy_async_on_interface(struct dev_state *ps,
370 unsigned int ifnum)
371 {
372 struct list_head *p, *q, hitlist;
373 unsigned long flags;
374
375 INIT_LIST_HEAD(&hitlist);
376 spin_lock_irqsave(&ps->lock, flags);
377 list_for_each_safe(p, q, &ps->async_pending)
378 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
379 list_move_tail(p, &hitlist);
380 spin_unlock_irqrestore(&ps->lock, flags);
381 destroy_async(ps, &hitlist);
382 }
383
384 static inline void destroy_all_async(struct dev_state *ps)
385 {
386 destroy_async(ps, &ps->async_pending);
387 }
388
389 /*
390 * interface claims are made only at the request of user level code,
391 * which can also release them (explicitly or by closing files).
392 * they're also undone when devices disconnect.
393 */
394
395 static int driver_probe(struct usb_interface *intf,
396 const struct usb_device_id *id)
397 {
398 return -ENODEV;
399 }
400
401 static void driver_disconnect(struct usb_interface *intf)
402 {
403 struct dev_state *ps = usb_get_intfdata(intf);
404 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
405
406 if (!ps)
407 return;
408
409 /* NOTE: this relies on usbcore having canceled and completed
410 * all pending I/O requests; 2.6 does that.
411 */
412
413 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
414 clear_bit(ifnum, &ps->ifclaimed);
415 else
416 warn("interface number %u out of range", ifnum);
417
418 usb_set_intfdata(intf, NULL);
419
420 /* force async requests to complete */
421 destroy_async_on_interface(ps, ifnum);
422 }
423
424 /* The following routines are merely placeholders. There is no way
425 * to inform a user task about suspend or resumes.
426 */
427 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
428 {
429 return 0;
430 }
431
432 static int driver_resume(struct usb_interface *intf)
433 {
434 return 0;
435 }
436
437 struct usb_driver usbfs_driver = {
438 .name = "usbfs",
439 .probe = driver_probe,
440 .disconnect = driver_disconnect,
441 .suspend = driver_suspend,
442 .resume = driver_resume,
443 };
444
445 static int claimintf(struct dev_state *ps, unsigned int ifnum)
446 {
447 struct usb_device *dev = ps->dev;
448 struct usb_interface *intf;
449 int err;
450
451 if (ifnum >= 8*sizeof(ps->ifclaimed))
452 return -EINVAL;
453 /* already claimed */
454 if (test_bit(ifnum, &ps->ifclaimed))
455 return 0;
456
457 intf = usb_ifnum_to_if(dev, ifnum);
458 if (!intf)
459 err = -ENOENT;
460 else
461 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
462 if (err == 0)
463 set_bit(ifnum, &ps->ifclaimed);
464 return err;
465 }
466
467 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
468 {
469 struct usb_device *dev;
470 struct usb_interface *intf;
471 int err;
472
473 err = -EINVAL;
474 if (ifnum >= 8*sizeof(ps->ifclaimed))
475 return err;
476 dev = ps->dev;
477 intf = usb_ifnum_to_if(dev, ifnum);
478 if (!intf)
479 err = -ENOENT;
480 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
481 usb_driver_release_interface(&usbfs_driver, intf);
482 err = 0;
483 }
484 return err;
485 }
486
487 static int checkintf(struct dev_state *ps, unsigned int ifnum)
488 {
489 if (ps->dev->state != USB_STATE_CONFIGURED)
490 return -EHOSTUNREACH;
491 if (ifnum >= 8*sizeof(ps->ifclaimed))
492 return -EINVAL;
493 if (test_bit(ifnum, &ps->ifclaimed))
494 return 0;
495 /* if not yet claimed, claim it for the driver */
496 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
497 "interface %u before use\n", task_pid_nr(current),
498 current->comm, ifnum);
499 return claimintf(ps, ifnum);
500 }
501
502 static int findintfep(struct usb_device *dev, unsigned int ep)
503 {
504 unsigned int i, j, e;
505 struct usb_interface *intf;
506 struct usb_host_interface *alts;
507 struct usb_endpoint_descriptor *endpt;
508
509 if (ep & ~(USB_DIR_IN|0xf))
510 return -EINVAL;
511 if (!dev->actconfig)
512 return -ESRCH;
513 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
514 intf = dev->actconfig->interface[i];
515 for (j = 0; j < intf->num_altsetting; j++) {
516 alts = &intf->altsetting[j];
517 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
518 endpt = &alts->endpoint[e].desc;
519 if (endpt->bEndpointAddress == ep)
520 return alts->desc.bInterfaceNumber;
521 }
522 }
523 }
524 return -ENOENT;
525 }
526
527 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
528 unsigned int index)
529 {
530 int ret = 0;
531
532 if (ps->dev->state != USB_STATE_ADDRESS
533 && ps->dev->state != USB_STATE_CONFIGURED)
534 return -EHOSTUNREACH;
535 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
536 return 0;
537
538 index &= 0xff;
539 switch (requesttype & USB_RECIP_MASK) {
540 case USB_RECIP_ENDPOINT:
541 ret = findintfep(ps->dev, index);
542 if (ret >= 0)
543 ret = checkintf(ps, ret);
544 break;
545
546 case USB_RECIP_INTERFACE:
547 ret = checkintf(ps, index);
548 break;
549 }
550 return ret;
551 }
552
553 static int match_devt(struct device *dev, void *data)
554 {
555 return dev->devt == (dev_t) (unsigned long) data;
556 }
557
558 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
559 {
560 struct device *dev;
561
562 dev = bus_find_device(&usb_bus_type, NULL,
563 (void *) (unsigned long) devt, match_devt);
564 if (!dev)
565 return NULL;
566 return container_of(dev, struct usb_device, dev);
567 }
568
569 /*
570 * file operations
571 */
572 static int usbdev_open(struct inode *inode, struct file *file)
573 {
574 struct usb_device *dev = NULL;
575 struct dev_state *ps;
576 int ret;
577
578 lock_kernel();
579 /* Protect against simultaneous removal or release */
580 mutex_lock(&usbfs_mutex);
581
582 ret = -ENOMEM;
583 ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
584 if (!ps)
585 goto out;
586
587 ret = -ENOENT;
588
589 /* usbdev device-node */
590 if (imajor(inode) == USB_DEVICE_MAJOR)
591 dev = usbdev_lookup_by_devt(inode->i_rdev);
592 #ifdef CONFIG_USB_DEVICEFS
593 /* procfs file */
594 if (!dev) {
595 dev = inode->i_private;
596 if (dev && dev->usbfs_dentry &&
597 dev->usbfs_dentry->d_inode == inode)
598 usb_get_dev(dev);
599 else
600 dev = NULL;
601 }
602 #endif
603 if (!dev || dev->state == USB_STATE_NOTATTACHED)
604 goto out;
605 ret = usb_autoresume_device(dev);
606 if (ret)
607 goto out;
608
609 ret = 0;
610 ps->dev = dev;
611 ps->file = file;
612 spin_lock_init(&ps->lock);
613 INIT_LIST_HEAD(&ps->list);
614 INIT_LIST_HEAD(&ps->async_pending);
615 INIT_LIST_HEAD(&ps->async_completed);
616 init_waitqueue_head(&ps->wait);
617 ps->discsignr = 0;
618 ps->disc_pid = get_pid(task_pid(current));
619 ps->disc_uid = current->uid;
620 ps->disc_euid = current->euid;
621 ps->disccontext = NULL;
622 ps->ifclaimed = 0;
623 security_task_getsecid(current, &ps->secid);
624 smp_wmb();
625 list_add_tail(&ps->list, &dev->filelist);
626 file->private_data = ps;
627 out:
628 if (ret) {
629 kfree(ps);
630 usb_put_dev(dev);
631 }
632 mutex_unlock(&usbfs_mutex);
633 unlock_kernel();
634 return ret;
635 }
636
637 static int usbdev_release(struct inode *inode, struct file *file)
638 {
639 struct dev_state *ps = file->private_data;
640 struct usb_device *dev = ps->dev;
641 unsigned int ifnum;
642
643 usb_lock_device(dev);
644
645 /* Protect against simultaneous open */
646 mutex_lock(&usbfs_mutex);
647 list_del_init(&ps->list);
648 mutex_unlock(&usbfs_mutex);
649
650 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
651 ifnum++) {
652 if (test_bit(ifnum, &ps->ifclaimed))
653 releaseintf(ps, ifnum);
654 }
655 destroy_all_async(ps);
656 usb_autosuspend_device(dev);
657 usb_unlock_device(dev);
658 usb_put_dev(dev);
659 put_pid(ps->disc_pid);
660 kfree(ps);
661 return 0;
662 }
663
664 static int proc_control(struct dev_state *ps, void __user *arg)
665 {
666 struct usb_device *dev = ps->dev;
667 struct usbdevfs_ctrltransfer ctrl;
668 unsigned int tmo;
669 unsigned char *tbuf;
670 unsigned wLength;
671 int i, j, ret;
672
673 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
674 return -EFAULT;
675 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
676 if (ret)
677 return ret;
678 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
679 if (wLength > PAGE_SIZE)
680 return -EINVAL;
681 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
682 if (!tbuf)
683 return -ENOMEM;
684 tmo = ctrl.timeout;
685 if (ctrl.bRequestType & 0x80) {
686 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
687 ctrl.wLength)) {
688 free_page((unsigned long)tbuf);
689 return -EINVAL;
690 }
691 snoop(&dev->dev, "control read: bRequest=%02x "
692 "bRrequestType=%02x wValue=%04x "
693 "wIndex=%04x wLength=%04x\n",
694 ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
695 ctrl.wIndex, ctrl.wLength);
696
697 usb_unlock_device(dev);
698 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest,
699 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
700 tbuf, ctrl.wLength, tmo);
701 usb_lock_device(dev);
702 if ((i > 0) && ctrl.wLength) {
703 if (usbfs_snoop) {
704 dev_info(&dev->dev, "control read: data ");
705 for (j = 0; j < i; ++j)
706 printk("%02x ", (u8)(tbuf)[j]);
707 printk("\n");
708 }
709 if (copy_to_user(ctrl.data, tbuf, i)) {
710 free_page((unsigned long)tbuf);
711 return -EFAULT;
712 }
713 }
714 } else {
715 if (ctrl.wLength) {
716 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
717 free_page((unsigned long)tbuf);
718 return -EFAULT;
719 }
720 }
721 snoop(&dev->dev, "control write: bRequest=%02x "
722 "bRrequestType=%02x wValue=%04x "
723 "wIndex=%04x wLength=%04x\n",
724 ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
725 ctrl.wIndex, ctrl.wLength);
726 if (usbfs_snoop) {
727 dev_info(&dev->dev, "control write: data: ");
728 for (j = 0; j < ctrl.wLength; ++j)
729 printk("%02x ", (unsigned char)(tbuf)[j]);
730 printk("\n");
731 }
732 usb_unlock_device(dev);
733 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
734 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
735 tbuf, ctrl.wLength, tmo);
736 usb_lock_device(dev);
737 }
738 free_page((unsigned long)tbuf);
739 if (i < 0 && i != -EPIPE) {
740 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
741 "failed cmd %s rqt %u rq %u len %u ret %d\n",
742 current->comm, ctrl.bRequestType, ctrl.bRequest,
743 ctrl.wLength, i);
744 }
745 return i;
746 }
747
748 static int proc_bulk(struct dev_state *ps, void __user *arg)
749 {
750 struct usb_device *dev = ps->dev;
751 struct usbdevfs_bulktransfer bulk;
752 unsigned int tmo, len1, pipe;
753 int len2;
754 unsigned char *tbuf;
755 int i, j, ret;
756
757 if (copy_from_user(&bulk, arg, sizeof(bulk)))
758 return -EFAULT;
759 ret = findintfep(ps->dev, bulk.ep);
760 if (ret < 0)
761 return ret;
762 ret = checkintf(ps, ret);
763 if (ret)
764 return ret;
765 if (bulk.ep & USB_DIR_IN)
766 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
767 else
768 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
769 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
770 return -EINVAL;
771 len1 = bulk.len;
772 if (len1 > MAX_USBFS_BUFFER_SIZE)
773 return -EINVAL;
774 if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
775 return -ENOMEM;
776 tmo = bulk.timeout;
777 if (bulk.ep & 0x80) {
778 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
779 kfree(tbuf);
780 return -EINVAL;
781 }
782 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
783 bulk.len, bulk.timeout);
784 usb_unlock_device(dev);
785 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
786 usb_lock_device(dev);
787 if (!i && len2) {
788 if (usbfs_snoop) {
789 dev_info(&dev->dev, "bulk read: data ");
790 for (j = 0; j < len2; ++j)
791 printk("%02x ", (u8)(tbuf)[j]);
792 printk("\n");
793 }
794 if (copy_to_user(bulk.data, tbuf, len2)) {
795 kfree(tbuf);
796 return -EFAULT;
797 }
798 }
799 } else {
800 if (len1) {
801 if (copy_from_user(tbuf, bulk.data, len1)) {
802 kfree(tbuf);
803 return -EFAULT;
804 }
805 }
806 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
807 bulk.len, bulk.timeout);
808 if (usbfs_snoop) {
809 dev_info(&dev->dev, "bulk write: data: ");
810 for (j = 0; j < len1; ++j)
811 printk("%02x ", (unsigned char)(tbuf)[j]);
812 printk("\n");
813 }
814 usb_unlock_device(dev);
815 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
816 usb_lock_device(dev);
817 }
818 kfree(tbuf);
819 if (i < 0)
820 return i;
821 return len2;
822 }
823
824 static int proc_resetep(struct dev_state *ps, void __user *arg)
825 {
826 unsigned int ep;
827 int ret;
828
829 if (get_user(ep, (unsigned int __user *)arg))
830 return -EFAULT;
831 ret = findintfep(ps->dev, ep);
832 if (ret < 0)
833 return ret;
834 ret = checkintf(ps, ret);
835 if (ret)
836 return ret;
837 usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
838 return 0;
839 }
840
841 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
842 {
843 unsigned int ep;
844 int pipe;
845 int ret;
846
847 if (get_user(ep, (unsigned int __user *)arg))
848 return -EFAULT;
849 ret = findintfep(ps->dev, ep);
850 if (ret < 0)
851 return ret;
852 ret = checkintf(ps, ret);
853 if (ret)
854 return ret;
855 if (ep & USB_DIR_IN)
856 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
857 else
858 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
859
860 return usb_clear_halt(ps->dev, pipe);
861 }
862
863 static int proc_getdriver(struct dev_state *ps, void __user *arg)
864 {
865 struct usbdevfs_getdriver gd;
866 struct usb_interface *intf;
867 int ret;
868
869 if (copy_from_user(&gd, arg, sizeof(gd)))
870 return -EFAULT;
871 intf = usb_ifnum_to_if(ps->dev, gd.interface);
872 if (!intf || !intf->dev.driver)
873 ret = -ENODATA;
874 else {
875 strncpy(gd.driver, intf->dev.driver->name,
876 sizeof(gd.driver));
877 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
878 }
879 return ret;
880 }
881
882 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
883 {
884 struct usbdevfs_connectinfo ci;
885
886 ci.devnum = ps->dev->devnum;
887 ci.slow = ps->dev->speed == USB_SPEED_LOW;
888 if (copy_to_user(arg, &ci, sizeof(ci)))
889 return -EFAULT;
890 return 0;
891 }
892
893 static int proc_resetdevice(struct dev_state *ps)
894 {
895 return usb_reset_device(ps->dev);
896 }
897
898 static int proc_setintf(struct dev_state *ps, void __user *arg)
899 {
900 struct usbdevfs_setinterface setintf;
901 int ret;
902
903 if (copy_from_user(&setintf, arg, sizeof(setintf)))
904 return -EFAULT;
905 if ((ret = checkintf(ps, setintf.interface)))
906 return ret;
907 return usb_set_interface(ps->dev, setintf.interface,
908 setintf.altsetting);
909 }
910
911 static int proc_setconfig(struct dev_state *ps, void __user *arg)
912 {
913 int u;
914 int status = 0;
915 struct usb_host_config *actconfig;
916
917 if (get_user(u, (int __user *)arg))
918 return -EFAULT;
919
920 actconfig = ps->dev->actconfig;
921
922 /* Don't touch the device if any interfaces are claimed.
923 * It could interfere with other drivers' operations, and if
924 * an interface is claimed by usbfs it could easily deadlock.
925 */
926 if (actconfig) {
927 int i;
928
929 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
930 if (usb_interface_claimed(actconfig->interface[i])) {
931 dev_warn(&ps->dev->dev,
932 "usbfs: interface %d claimed by %s "
933 "while '%s' sets config #%d\n",
934 actconfig->interface[i]
935 ->cur_altsetting
936 ->desc.bInterfaceNumber,
937 actconfig->interface[i]
938 ->dev.driver->name,
939 current->comm, u);
940 status = -EBUSY;
941 break;
942 }
943 }
944 }
945
946 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
947 * so avoid usb_set_configuration()'s kick to sysfs
948 */
949 if (status == 0) {
950 if (actconfig && actconfig->desc.bConfigurationValue == u)
951 status = usb_reset_configuration(ps->dev);
952 else
953 status = usb_set_configuration(ps->dev, u);
954 }
955
956 return status;
957 }
958
959 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
960 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
961 void __user *arg)
962 {
963 struct usbdevfs_iso_packet_desc *isopkt = NULL;
964 struct usb_host_endpoint *ep;
965 struct async *as;
966 struct usb_ctrlrequest *dr = NULL;
967 unsigned int u, totlen, isofrmlen;
968 int ret, ifnum = -1;
969 int is_in;
970
971 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
972 USBDEVFS_URB_SHORT_NOT_OK |
973 USBDEVFS_URB_NO_FSBR |
974 USBDEVFS_URB_ZERO_PACKET |
975 USBDEVFS_URB_NO_INTERRUPT))
976 return -EINVAL;
977 if (!uurb->buffer)
978 return -EINVAL;
979 if (uurb->signr != 0 && (uurb->signr < SIGRTMIN ||
980 uurb->signr > SIGRTMAX))
981 return -EINVAL;
982 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
983 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
984 ifnum = findintfep(ps->dev, uurb->endpoint);
985 if (ifnum < 0)
986 return ifnum;
987 ret = checkintf(ps, ifnum);
988 if (ret)
989 return ret;
990 }
991 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
992 is_in = 1;
993 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
994 } else {
995 is_in = 0;
996 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
997 }
998 if (!ep)
999 return -ENOENT;
1000 switch(uurb->type) {
1001 case USBDEVFS_URB_TYPE_CONTROL:
1002 if (!usb_endpoint_xfer_control(&ep->desc))
1003 return -EINVAL;
1004 /* min 8 byte setup packet,
1005 * max 8 byte setup plus an arbitrary data stage */
1006 if (uurb->buffer_length < 8 ||
1007 uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1008 return -EINVAL;
1009 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1010 if (!dr)
1011 return -ENOMEM;
1012 if (copy_from_user(dr, uurb->buffer, 8)) {
1013 kfree(dr);
1014 return -EFAULT;
1015 }
1016 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1017 kfree(dr);
1018 return -EINVAL;
1019 }
1020 ret = check_ctrlrecip(ps, dr->bRequestType,
1021 le16_to_cpup(&dr->wIndex));
1022 if (ret) {
1023 kfree(dr);
1024 return ret;
1025 }
1026 uurb->number_of_packets = 0;
1027 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1028 uurb->buffer += 8;
1029 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1030 is_in = 1;
1031 uurb->endpoint |= USB_DIR_IN;
1032 } else {
1033 is_in = 0;
1034 uurb->endpoint &= ~USB_DIR_IN;
1035 }
1036 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1037 uurb->buffer, uurb->buffer_length)) {
1038 kfree(dr);
1039 return -EFAULT;
1040 }
1041 snoop(&ps->dev->dev, "control urb: bRequest=%02x "
1042 "bRrequestType=%02x wValue=%04x "
1043 "wIndex=%04x wLength=%04x\n",
1044 dr->bRequest, dr->bRequestType,
1045 __le16_to_cpup(&dr->wValue),
1046 __le16_to_cpup(&dr->wIndex),
1047 __le16_to_cpup(&dr->wLength));
1048 break;
1049
1050 case USBDEVFS_URB_TYPE_BULK:
1051 switch (usb_endpoint_type(&ep->desc)) {
1052 case USB_ENDPOINT_XFER_CONTROL:
1053 case USB_ENDPOINT_XFER_ISOC:
1054 return -EINVAL;
1055 /* allow single-shot interrupt transfers, at bogus rates */
1056 }
1057 uurb->number_of_packets = 0;
1058 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1059 return -EINVAL;
1060 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1061 uurb->buffer, uurb->buffer_length))
1062 return -EFAULT;
1063 snoop(&ps->dev->dev, "bulk urb\n");
1064 break;
1065
1066 case USBDEVFS_URB_TYPE_ISO:
1067 /* arbitrary limit */
1068 if (uurb->number_of_packets < 1 ||
1069 uurb->number_of_packets > 128)
1070 return -EINVAL;
1071 if (!usb_endpoint_xfer_isoc(&ep->desc))
1072 return -EINVAL;
1073 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1074 uurb->number_of_packets;
1075 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1076 return -ENOMEM;
1077 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1078 kfree(isopkt);
1079 return -EFAULT;
1080 }
1081 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1082 /* arbitrary limit,
1083 * sufficient for USB 2.0 high-bandwidth iso */
1084 if (isopkt[u].length > 8192) {
1085 kfree(isopkt);
1086 return -EINVAL;
1087 }
1088 totlen += isopkt[u].length;
1089 }
1090 if (totlen > 32768) {
1091 kfree(isopkt);
1092 return -EINVAL;
1093 }
1094 uurb->buffer_length = totlen;
1095 snoop(&ps->dev->dev, "iso urb\n");
1096 break;
1097
1098 case USBDEVFS_URB_TYPE_INTERRUPT:
1099 uurb->number_of_packets = 0;
1100 if (!usb_endpoint_xfer_int(&ep->desc))
1101 return -EINVAL;
1102 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1103 return -EINVAL;
1104 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1105 uurb->buffer, uurb->buffer_length))
1106 return -EFAULT;
1107 snoop(&ps->dev->dev, "interrupt urb\n");
1108 break;
1109
1110 default:
1111 return -EINVAL;
1112 }
1113 as = alloc_async(uurb->number_of_packets);
1114 if (!as) {
1115 kfree(isopkt);
1116 kfree(dr);
1117 return -ENOMEM;
1118 }
1119 as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL);
1120 if (!as->urb->transfer_buffer) {
1121 kfree(isopkt);
1122 kfree(dr);
1123 free_async(as);
1124 return -ENOMEM;
1125 }
1126 as->urb->dev = ps->dev;
1127 as->urb->pipe = (uurb->type << 30) |
1128 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1129 (uurb->endpoint & USB_DIR_IN);
1130
1131 /* This tedious sequence is necessary because the URB_* flags
1132 * are internal to the kernel and subject to change, whereas
1133 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1134 */
1135 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1136 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1137 u |= URB_ISO_ASAP;
1138 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1139 u |= URB_SHORT_NOT_OK;
1140 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1141 u |= URB_NO_FSBR;
1142 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1143 u |= URB_ZERO_PACKET;
1144 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1145 u |= URB_NO_INTERRUPT;
1146 as->urb->transfer_flags = u;
1147
1148 as->urb->transfer_buffer_length = uurb->buffer_length;
1149 as->urb->setup_packet = (unsigned char *)dr;
1150 as->urb->start_frame = uurb->start_frame;
1151 as->urb->number_of_packets = uurb->number_of_packets;
1152 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1153 ps->dev->speed == USB_SPEED_HIGH)
1154 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1155 else
1156 as->urb->interval = ep->desc.bInterval;
1157 as->urb->context = as;
1158 as->urb->complete = async_completed;
1159 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1160 as->urb->iso_frame_desc[u].offset = totlen;
1161 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1162 totlen += isopkt[u].length;
1163 }
1164 kfree(isopkt);
1165 as->ps = ps;
1166 as->userurb = arg;
1167 if (uurb->endpoint & USB_DIR_IN)
1168 as->userbuffer = uurb->buffer;
1169 else
1170 as->userbuffer = NULL;
1171 as->signr = uurb->signr;
1172 as->ifnum = ifnum;
1173 as->pid = get_pid(task_pid(current));
1174 as->uid = current->uid;
1175 as->euid = current->euid;
1176 security_task_getsecid(current, &as->secid);
1177 if (!is_in) {
1178 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1179 as->urb->transfer_buffer_length)) {
1180 free_async(as);
1181 return -EFAULT;
1182 }
1183 }
1184 snoop_urb(as->urb, as->userurb);
1185 async_newpending(as);
1186 if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1187 dev_printk(KERN_DEBUG, &ps->dev->dev,
1188 "usbfs: usb_submit_urb returned %d\n", ret);
1189 async_removepending(as);
1190 free_async(as);
1191 return ret;
1192 }
1193 return 0;
1194 }
1195
1196 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1197 {
1198 struct usbdevfs_urb uurb;
1199
1200 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1201 return -EFAULT;
1202
1203 return proc_do_submiturb(ps, &uurb,
1204 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1205 arg);
1206 }
1207
1208 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1209 {
1210 struct async *as;
1211
1212 as = async_getpending(ps, arg);
1213 if (!as)
1214 return -EINVAL;
1215 usb_kill_urb(as->urb);
1216 return 0;
1217 }
1218
1219 static int processcompl(struct async *as, void __user * __user *arg)
1220 {
1221 struct urb *urb = as->urb;
1222 struct usbdevfs_urb __user *userurb = as->userurb;
1223 void __user *addr = as->userurb;
1224 unsigned int i;
1225
1226 if (as->userbuffer)
1227 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1228 urb->transfer_buffer_length))
1229 return -EFAULT;
1230 if (put_user(as->status, &userurb->status))
1231 return -EFAULT;
1232 if (put_user(urb->actual_length, &userurb->actual_length))
1233 return -EFAULT;
1234 if (put_user(urb->error_count, &userurb->error_count))
1235 return -EFAULT;
1236
1237 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1238 for (i = 0; i < urb->number_of_packets; i++) {
1239 if (put_user(urb->iso_frame_desc[i].actual_length,
1240 &userurb->iso_frame_desc[i].actual_length))
1241 return -EFAULT;
1242 if (put_user(urb->iso_frame_desc[i].status,
1243 &userurb->iso_frame_desc[i].status))
1244 return -EFAULT;
1245 }
1246 }
1247
1248 free_async(as);
1249
1250 if (put_user(addr, (void __user * __user *)arg))
1251 return -EFAULT;
1252 return 0;
1253 }
1254
1255 static struct async *reap_as(struct dev_state *ps)
1256 {
1257 DECLARE_WAITQUEUE(wait, current);
1258 struct async *as = NULL;
1259 struct usb_device *dev = ps->dev;
1260
1261 add_wait_queue(&ps->wait, &wait);
1262 for (;;) {
1263 __set_current_state(TASK_INTERRUPTIBLE);
1264 as = async_getcompleted(ps);
1265 if (as)
1266 break;
1267 if (signal_pending(current))
1268 break;
1269 usb_unlock_device(dev);
1270 schedule();
1271 usb_lock_device(dev);
1272 }
1273 remove_wait_queue(&ps->wait, &wait);
1274 set_current_state(TASK_RUNNING);
1275 return as;
1276 }
1277
1278 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1279 {
1280 struct async *as = reap_as(ps);
1281 if (as)
1282 return processcompl(as, (void __user * __user *)arg);
1283 if (signal_pending(current))
1284 return -EINTR;
1285 return -EIO;
1286 }
1287
1288 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1289 {
1290 struct async *as;
1291
1292 if (!(as = async_getcompleted(ps)))
1293 return -EAGAIN;
1294 return processcompl(as, (void __user * __user *)arg);
1295 }
1296
1297 #ifdef CONFIG_COMPAT
1298
1299 static int get_urb32(struct usbdevfs_urb *kurb,
1300 struct usbdevfs_urb32 __user *uurb)
1301 {
1302 __u32 uptr;
1303 if (get_user(kurb->type, &uurb->type) ||
1304 __get_user(kurb->endpoint, &uurb->endpoint) ||
1305 __get_user(kurb->status, &uurb->status) ||
1306 __get_user(kurb->flags, &uurb->flags) ||
1307 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1308 __get_user(kurb->actual_length, &uurb->actual_length) ||
1309 __get_user(kurb->start_frame, &uurb->start_frame) ||
1310 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1311 __get_user(kurb->error_count, &uurb->error_count) ||
1312 __get_user(kurb->signr, &uurb->signr))
1313 return -EFAULT;
1314
1315 if (__get_user(uptr, &uurb->buffer))
1316 return -EFAULT;
1317 kurb->buffer = compat_ptr(uptr);
1318 if (__get_user(uptr, &uurb->buffer))
1319 return -EFAULT;
1320 kurb->usercontext = compat_ptr(uptr);
1321
1322 return 0;
1323 }
1324
1325 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1326 {
1327 struct usbdevfs_urb uurb;
1328
1329 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1330 return -EFAULT;
1331
1332 return proc_do_submiturb(ps, &uurb,
1333 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1334 arg);
1335 }
1336
1337 static int processcompl_compat(struct async *as, void __user * __user *arg)
1338 {
1339 struct urb *urb = as->urb;
1340 struct usbdevfs_urb32 __user *userurb = as->userurb;
1341 void __user *addr = as->userurb;
1342 unsigned int i;
1343
1344 if (as->userbuffer)
1345 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1346 urb->transfer_buffer_length))
1347 return -EFAULT;
1348 if (put_user(as->status, &userurb->status))
1349 return -EFAULT;
1350 if (put_user(urb->actual_length, &userurb->actual_length))
1351 return -EFAULT;
1352 if (put_user(urb->error_count, &userurb->error_count))
1353 return -EFAULT;
1354
1355 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1356 for (i = 0; i < urb->number_of_packets; i++) {
1357 if (put_user(urb->iso_frame_desc[i].actual_length,
1358 &userurb->iso_frame_desc[i].actual_length))
1359 return -EFAULT;
1360 if (put_user(urb->iso_frame_desc[i].status,
1361 &userurb->iso_frame_desc[i].status))
1362 return -EFAULT;
1363 }
1364 }
1365
1366 free_async(as);
1367 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1368 return -EFAULT;
1369 return 0;
1370 }
1371
1372 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1373 {
1374 struct async *as = reap_as(ps);
1375 if (as)
1376 return processcompl_compat(as, (void __user * __user *)arg);
1377 if (signal_pending(current))
1378 return -EINTR;
1379 return -EIO;
1380 }
1381
1382 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1383 {
1384 struct async *as;
1385
1386 if (!(as = async_getcompleted(ps)))
1387 return -EAGAIN;
1388 return processcompl_compat(as, (void __user * __user *)arg);
1389 }
1390
1391 #endif
1392
1393 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1394 {
1395 struct usbdevfs_disconnectsignal ds;
1396
1397 if (copy_from_user(&ds, arg, sizeof(ds)))
1398 return -EFAULT;
1399 if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1400 return -EINVAL;
1401 ps->discsignr = ds.signr;
1402 ps->disccontext = ds.context;
1403 return 0;
1404 }
1405
1406 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1407 {
1408 unsigned int ifnum;
1409
1410 if (get_user(ifnum, (unsigned int __user *)arg))
1411 return -EFAULT;
1412 return claimintf(ps, ifnum);
1413 }
1414
1415 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1416 {
1417 unsigned int ifnum;
1418 int ret;
1419
1420 if (get_user(ifnum, (unsigned int __user *)arg))
1421 return -EFAULT;
1422 if ((ret = releaseintf(ps, ifnum)) < 0)
1423 return ret;
1424 destroy_async_on_interface (ps, ifnum);
1425 return 0;
1426 }
1427
1428 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1429 {
1430 int size;
1431 void *buf = NULL;
1432 int retval = 0;
1433 struct usb_interface *intf = NULL;
1434 struct usb_driver *driver = NULL;
1435
1436 /* alloc buffer */
1437 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1438 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1439 return -ENOMEM;
1440 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1441 if (copy_from_user(buf, ctl->data, size)) {
1442 kfree(buf);
1443 return -EFAULT;
1444 }
1445 } else {
1446 memset(buf, 0, size);
1447 }
1448 }
1449
1450 if (!connected(ps)) {
1451 kfree(buf);
1452 return -ENODEV;
1453 }
1454
1455 if (ps->dev->state != USB_STATE_CONFIGURED)
1456 retval = -EHOSTUNREACH;
1457 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1458 retval = -EINVAL;
1459 else switch (ctl->ioctl_code) {
1460
1461 /* disconnect kernel driver from interface */
1462 case USBDEVFS_DISCONNECT:
1463 if (intf->dev.driver) {
1464 driver = to_usb_driver(intf->dev.driver);
1465 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1466 usb_driver_release_interface(driver, intf);
1467 } else
1468 retval = -ENODATA;
1469 break;
1470
1471 /* let kernel drivers try to (re)bind to the interface */
1472 case USBDEVFS_CONNECT:
1473 if (!intf->dev.driver)
1474 retval = device_attach(&intf->dev);
1475 else
1476 retval = -EBUSY;
1477 break;
1478
1479 /* talk directly to the interface's driver */
1480 default:
1481 if (intf->dev.driver)
1482 driver = to_usb_driver(intf->dev.driver);
1483 if (driver == NULL || driver->ioctl == NULL) {
1484 retval = -ENOTTY;
1485 } else {
1486 retval = driver->ioctl(intf, ctl->ioctl_code, buf);
1487 if (retval == -ENOIOCTLCMD)
1488 retval = -ENOTTY;
1489 }
1490 }
1491
1492 /* cleanup and return */
1493 if (retval >= 0
1494 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1495 && size > 0
1496 && copy_to_user(ctl->data, buf, size) != 0)
1497 retval = -EFAULT;
1498
1499 kfree(buf);
1500 return retval;
1501 }
1502
1503 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1504 {
1505 struct usbdevfs_ioctl ctrl;
1506
1507 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1508 return -EFAULT;
1509 return proc_ioctl(ps, &ctrl);
1510 }
1511
1512 #ifdef CONFIG_COMPAT
1513 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1514 {
1515 struct usbdevfs_ioctl32 __user *uioc;
1516 struct usbdevfs_ioctl ctrl;
1517 u32 udata;
1518
1519 uioc = compat_ptr((long)arg);
1520 if (get_user(ctrl.ifno, &uioc->ifno) ||
1521 get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1522 __get_user(udata, &uioc->data))
1523 return -EFAULT;
1524 ctrl.data = compat_ptr(udata);
1525
1526 return proc_ioctl(ps, &ctrl);
1527 }
1528 #endif
1529
1530 /*
1531 * NOTE: All requests here that have interface numbers as parameters
1532 * are assuming that somehow the configuration has been prevented from
1533 * changing. But there's no mechanism to ensure that...
1534 */
1535 static int usbdev_ioctl(struct inode *inode, struct file *file,
1536 unsigned int cmd, unsigned long arg)
1537 {
1538 struct dev_state *ps = file->private_data;
1539 struct usb_device *dev = ps->dev;
1540 void __user *p = (void __user *)arg;
1541 int ret = -ENOTTY;
1542
1543 if (!(file->f_mode & FMODE_WRITE))
1544 return -EPERM;
1545 usb_lock_device(dev);
1546 if (!connected(ps)) {
1547 usb_unlock_device(dev);
1548 return -ENODEV;
1549 }
1550
1551 switch (cmd) {
1552 case USBDEVFS_CONTROL:
1553 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1554 ret = proc_control(ps, p);
1555 if (ret >= 0)
1556 inode->i_mtime = CURRENT_TIME;
1557 break;
1558
1559 case USBDEVFS_BULK:
1560 snoop(&dev->dev, "%s: BULK\n", __func__);
1561 ret = proc_bulk(ps, p);
1562 if (ret >= 0)
1563 inode->i_mtime = CURRENT_TIME;
1564 break;
1565
1566 case USBDEVFS_RESETEP:
1567 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1568 ret = proc_resetep(ps, p);
1569 if (ret >= 0)
1570 inode->i_mtime = CURRENT_TIME;
1571 break;
1572
1573 case USBDEVFS_RESET:
1574 snoop(&dev->dev, "%s: RESET\n", __func__);
1575 ret = proc_resetdevice(ps);
1576 break;
1577
1578 case USBDEVFS_CLEAR_HALT:
1579 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1580 ret = proc_clearhalt(ps, p);
1581 if (ret >= 0)
1582 inode->i_mtime = CURRENT_TIME;
1583 break;
1584
1585 case USBDEVFS_GETDRIVER:
1586 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1587 ret = proc_getdriver(ps, p);
1588 break;
1589
1590 case USBDEVFS_CONNECTINFO:
1591 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1592 ret = proc_connectinfo(ps, p);
1593 break;
1594
1595 case USBDEVFS_SETINTERFACE:
1596 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1597 ret = proc_setintf(ps, p);
1598 break;
1599
1600 case USBDEVFS_SETCONFIGURATION:
1601 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1602 ret = proc_setconfig(ps, p);
1603 break;
1604
1605 case USBDEVFS_SUBMITURB:
1606 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1607 ret = proc_submiturb(ps, p);
1608 if (ret >= 0)
1609 inode->i_mtime = CURRENT_TIME;
1610 break;
1611
1612 #ifdef CONFIG_COMPAT
1613
1614 case USBDEVFS_SUBMITURB32:
1615 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1616 ret = proc_submiturb_compat(ps, p);
1617 if (ret >= 0)
1618 inode->i_mtime = CURRENT_TIME;
1619 break;
1620
1621 case USBDEVFS_REAPURB32:
1622 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1623 ret = proc_reapurb_compat(ps, p);
1624 break;
1625
1626 case USBDEVFS_REAPURBNDELAY32:
1627 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __func__);
1628 ret = proc_reapurbnonblock_compat(ps, p);
1629 break;
1630
1631 case USBDEVFS_IOCTL32:
1632 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1633 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1634 break;
1635 #endif
1636
1637 case USBDEVFS_DISCARDURB:
1638 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1639 ret = proc_unlinkurb(ps, p);
1640 break;
1641
1642 case USBDEVFS_REAPURB:
1643 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1644 ret = proc_reapurb(ps, p);
1645 break;
1646
1647 case USBDEVFS_REAPURBNDELAY:
1648 snoop(&dev->dev, "%s: REAPURBDELAY\n", __func__);
1649 ret = proc_reapurbnonblock(ps, p);
1650 break;
1651
1652 case USBDEVFS_DISCSIGNAL:
1653 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1654 ret = proc_disconnectsignal(ps, p);
1655 break;
1656
1657 case USBDEVFS_CLAIMINTERFACE:
1658 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1659 ret = proc_claiminterface(ps, p);
1660 break;
1661
1662 case USBDEVFS_RELEASEINTERFACE:
1663 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1664 ret = proc_releaseinterface(ps, p);
1665 break;
1666
1667 case USBDEVFS_IOCTL:
1668 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1669 ret = proc_ioctl_default(ps, p);
1670 break;
1671 }
1672 usb_unlock_device(dev);
1673 if (ret >= 0)
1674 inode->i_atime = CURRENT_TIME;
1675 return ret;
1676 }
1677
1678 /* No kernel lock - fine */
1679 static unsigned int usbdev_poll(struct file *file,
1680 struct poll_table_struct *wait)
1681 {
1682 struct dev_state *ps = file->private_data;
1683 unsigned int mask = 0;
1684
1685 poll_wait(file, &ps->wait, wait);
1686 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1687 mask |= POLLOUT | POLLWRNORM;
1688 if (!connected(ps))
1689 mask |= POLLERR | POLLHUP;
1690 return mask;
1691 }
1692
1693 const struct file_operations usbdev_file_operations = {
1694 .owner = THIS_MODULE,
1695 .llseek = usbdev_lseek,
1696 .read = usbdev_read,
1697 .poll = usbdev_poll,
1698 .ioctl = usbdev_ioctl,
1699 .open = usbdev_open,
1700 .release = usbdev_release,
1701 };
1702
1703 void usb_fs_classdev_common_remove(struct usb_device *udev)
1704 {
1705 struct dev_state *ps;
1706 struct siginfo sinfo;
1707
1708 while (!list_empty(&udev->filelist)) {
1709 ps = list_entry(udev->filelist.next, struct dev_state, list);
1710 destroy_all_async(ps);
1711 wake_up_all(&ps->wait);
1712 list_del_init(&ps->list);
1713 if (ps->discsignr) {
1714 sinfo.si_signo = ps->discsignr;
1715 sinfo.si_errno = EPIPE;
1716 sinfo.si_code = SI_ASYNCIO;
1717 sinfo.si_addr = ps->disccontext;
1718 kill_pid_info_as_uid(ps->discsignr, &sinfo,
1719 ps->disc_pid, ps->disc_uid,
1720 ps->disc_euid, ps->secid);
1721 }
1722 }
1723 }
1724
1725 #ifdef CONFIG_USB_DEVICE_CLASS
1726 static struct class *usb_classdev_class;
1727
1728 static int usb_classdev_add(struct usb_device *dev)
1729 {
1730 struct device *cldev;
1731
1732 cldev = device_create_drvdata(usb_classdev_class, &dev->dev,
1733 dev->dev.devt, NULL, "usbdev%d.%d",
1734 dev->bus->busnum, dev->devnum);
1735 if (IS_ERR(cldev))
1736 return PTR_ERR(cldev);
1737 dev->usb_classdev = cldev;
1738 return 0;
1739 }
1740
1741 static void usb_classdev_remove(struct usb_device *dev)
1742 {
1743 if (dev->usb_classdev)
1744 device_unregister(dev->usb_classdev);
1745 usb_fs_classdev_common_remove(dev);
1746 }
1747
1748 static int usb_classdev_notify(struct notifier_block *self,
1749 unsigned long action, void *dev)
1750 {
1751 switch (action) {
1752 case USB_DEVICE_ADD:
1753 if (usb_classdev_add(dev))
1754 return NOTIFY_BAD;
1755 break;
1756 case USB_DEVICE_REMOVE:
1757 usb_classdev_remove(dev);
1758 break;
1759 }
1760 return NOTIFY_OK;
1761 }
1762
1763 static struct notifier_block usbdev_nb = {
1764 .notifier_call = usb_classdev_notify,
1765 };
1766 #endif
1767
1768 static struct cdev usb_device_cdev;
1769
1770 int __init usb_devio_init(void)
1771 {
1772 int retval;
1773
1774 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1775 "usb_device");
1776 if (retval) {
1777 err("unable to register minors for usb_device");
1778 goto out;
1779 }
1780 cdev_init(&usb_device_cdev, &usbdev_file_operations);
1781 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1782 if (retval) {
1783 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1784 goto error_cdev;
1785 }
1786 #ifdef CONFIG_USB_DEVICE_CLASS
1787 usb_classdev_class = class_create(THIS_MODULE, "usb_device");
1788 if (IS_ERR(usb_classdev_class)) {
1789 err("unable to register usb_device class");
1790 retval = PTR_ERR(usb_classdev_class);
1791 cdev_del(&usb_device_cdev);
1792 usb_classdev_class = NULL;
1793 goto out;
1794 }
1795 /* devices of this class shadow the major:minor of their parent
1796 * device, so clear ->dev_kobj to prevent adding duplicate entries
1797 * to /sys/dev
1798 */
1799 usb_classdev_class->dev_kobj = NULL;
1800
1801 usb_register_notify(&usbdev_nb);
1802 #endif
1803 out:
1804 return retval;
1805
1806 error_cdev:
1807 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1808 goto out;
1809 }
1810
1811 void usb_devio_cleanup(void)
1812 {
1813 #ifdef CONFIG_USB_DEVICE_CLASS
1814 usb_unregister_notify(&usbdev_nb);
1815 class_destroy(usb_classdev_class);
1816 #endif
1817 cdev_del(&usb_device_cdev);
1818 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1819 }
linux-next