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1 /*****************************************************************************/
2
3 /*
4 * devio.c -- User space communication with USB devices.
5 *
6 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 * This file implements the usbfs/x/y files, where
23 * x is the bus number and y the device number.
24 *
25 * It allows user space programs/"drivers" to communicate directly
26 * with USB devices without intervening kernel driver.
27 *
28 * Revision history
29 * 22.12.1999 0.1 Initial release (split from proc_usb.c)
30 * 04.01.2000 0.2 Turned into its own filesystem
31 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
32 * (CAN-2005-3055)
33 */
34
35 /*****************************************************************************/
36
37 #include <linux/fs.h>
38 #include <linux/mm.h>
39 #include <linux/slab.h>
40 #include <linux/signal.h>
41 #include <linux/poll.h>
42 #include <linux/module.h>
43 #include <linux/usb.h>
44 #include <linux/usbdevice_fs.h>
45 #include <linux/usb/hcd.h> /* for usbcore internals */
46 #include <linux/cdev.h>
47 #include <linux/notifier.h>
48 #include <linux/security.h>
49 #include <linux/user_namespace.h>
50 #include <linux/scatterlist.h>
51 #include <asm/uaccess.h>
52 #include <asm/byteorder.h>
53 #include <linux/moduleparam.h>
54
55 #include "usb.h"
56
57 #define USB_MAXBUS 64
58 #define USB_DEVICE_MAX USB_MAXBUS * 128
59 #define USB_SG_SIZE 16384 /* split-size for large txs */
60
61 /* Mutual exclusion for removal, open, and release */
62 DEFINE_MUTEX(usbfs_mutex);
63
64 struct dev_state {
65 struct list_head list; /* state list */
66 struct usb_device *dev;
67 struct file *file;
68 spinlock_t lock; /* protects the async urb lists */
69 struct list_head async_pending;
70 struct list_head async_completed;
71 wait_queue_head_t wait; /* wake up if a request completed */
72 unsigned int discsignr;
73 struct pid *disc_pid;
74 const struct cred *cred;
75 void __user *disccontext;
76 unsigned long ifclaimed;
77 u32 secid;
78 u32 disabled_bulk_eps;
79 };
80
81 struct async {
82 struct list_head asynclist;
83 struct dev_state *ps;
84 struct pid *pid;
85 const struct cred *cred;
86 unsigned int signr;
87 unsigned int ifnum;
88 void __user *userbuffer;
89 void __user *userurb;
90 struct urb *urb;
91 unsigned int mem_usage;
92 int status;
93 u32 secid;
94 u8 bulk_addr;
95 u8 bulk_status;
96 };
97
98 static bool usbfs_snoop;
99 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
100 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
101
102 #define snoop(dev, format, arg...) \
103 do { \
104 if (usbfs_snoop) \
105 dev_info(dev , format , ## arg); \
106 } while (0)
107
108 enum snoop_when {
109 SUBMIT, COMPLETE
110 };
111
112 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
113
114 /* Limit on the total amount of memory we can allocate for transfers */
115 static unsigned usbfs_memory_mb = 16;
116 module_param(usbfs_memory_mb, uint, 0644);
117 MODULE_PARM_DESC(usbfs_memory_mb,
118 "maximum MB allowed for usbfs buffers (0 = no limit)");
119
120 /* Hard limit, necessary to avoid aithmetic overflow */
121 #define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
122
123 static atomic_t usbfs_memory_usage; /* Total memory currently allocated */
124
125 /* Check whether it's okay to allocate more memory for a transfer */
126 static int usbfs_increase_memory_usage(unsigned amount)
127 {
128 unsigned lim;
129
130 /*
131 * Convert usbfs_memory_mb to bytes, avoiding overflows.
132 * 0 means use the hard limit (effectively unlimited).
133 */
134 lim = ACCESS_ONCE(usbfs_memory_mb);
135 if (lim == 0 || lim > (USBFS_XFER_MAX >> 20))
136 lim = USBFS_XFER_MAX;
137 else
138 lim <<= 20;
139
140 atomic_add(amount, &usbfs_memory_usage);
141 if (atomic_read(&usbfs_memory_usage) <= lim)
142 return 0;
143 atomic_sub(amount, &usbfs_memory_usage);
144 return -ENOMEM;
145 }
146
147 /* Memory for a transfer is being deallocated */
148 static void usbfs_decrease_memory_usage(unsigned amount)
149 {
150 atomic_sub(amount, &usbfs_memory_usage);
151 }
152
153 static int connected(struct dev_state *ps)
154 {
155 return (!list_empty(&ps->list) &&
156 ps->dev->state != USB_STATE_NOTATTACHED);
157 }
158
159 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
160 {
161 loff_t ret;
162
163 mutex_lock(&file_inode(file)->i_mutex);
164
165 switch (orig) {
166 case 0:
167 file->f_pos = offset;
168 ret = file->f_pos;
169 break;
170 case 1:
171 file->f_pos += offset;
172 ret = file->f_pos;
173 break;
174 case 2:
175 default:
176 ret = -EINVAL;
177 }
178
179 mutex_unlock(&file_inode(file)->i_mutex);
180 return ret;
181 }
182
183 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
184 loff_t *ppos)
185 {
186 struct dev_state *ps = file->private_data;
187 struct usb_device *dev = ps->dev;
188 ssize_t ret = 0;
189 unsigned len;
190 loff_t pos;
191 int i;
192
193 pos = *ppos;
194 usb_lock_device(dev);
195 if (!connected(ps)) {
196 ret = -ENODEV;
197 goto err;
198 } else if (pos < 0) {
199 ret = -EINVAL;
200 goto err;
201 }
202
203 if (pos < sizeof(struct usb_device_descriptor)) {
204 /* 18 bytes - fits on the stack */
205 struct usb_device_descriptor temp_desc;
206
207 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
208 le16_to_cpus(&temp_desc.bcdUSB);
209 le16_to_cpus(&temp_desc.idVendor);
210 le16_to_cpus(&temp_desc.idProduct);
211 le16_to_cpus(&temp_desc.bcdDevice);
212
213 len = sizeof(struct usb_device_descriptor) - pos;
214 if (len > nbytes)
215 len = nbytes;
216 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
217 ret = -EFAULT;
218 goto err;
219 }
220
221 *ppos += len;
222 buf += len;
223 nbytes -= len;
224 ret += len;
225 }
226
227 pos = sizeof(struct usb_device_descriptor);
228 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
229 struct usb_config_descriptor *config =
230 (struct usb_config_descriptor *)dev->rawdescriptors[i];
231 unsigned int length = le16_to_cpu(config->wTotalLength);
232
233 if (*ppos < pos + length) {
234
235 /* The descriptor may claim to be longer than it
236 * really is. Here is the actual allocated length. */
237 unsigned alloclen =
238 le16_to_cpu(dev->config[i].desc.wTotalLength);
239
240 len = length - (*ppos - pos);
241 if (len > nbytes)
242 len = nbytes;
243
244 /* Simply don't write (skip over) unallocated parts */
245 if (alloclen > (*ppos - pos)) {
246 alloclen -= (*ppos - pos);
247 if (copy_to_user(buf,
248 dev->rawdescriptors[i] + (*ppos - pos),
249 min(len, alloclen))) {
250 ret = -EFAULT;
251 goto err;
252 }
253 }
254
255 *ppos += len;
256 buf += len;
257 nbytes -= len;
258 ret += len;
259 }
260
261 pos += length;
262 }
263
264 err:
265 usb_unlock_device(dev);
266 return ret;
267 }
268
269 /*
270 * async list handling
271 */
272
273 static struct async *alloc_async(unsigned int numisoframes)
274 {
275 struct async *as;
276
277 as = kzalloc(sizeof(struct async), GFP_KERNEL);
278 if (!as)
279 return NULL;
280 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
281 if (!as->urb) {
282 kfree(as);
283 return NULL;
284 }
285 return as;
286 }
287
288 static void free_async(struct async *as)
289 {
290 int i;
291
292 put_pid(as->pid);
293 if (as->cred)
294 put_cred(as->cred);
295 for (i = 0; i < as->urb->num_sgs; i++) {
296 if (sg_page(&as->urb->sg[i]))
297 kfree(sg_virt(&as->urb->sg[i]));
298 }
299 kfree(as->urb->sg);
300 kfree(as->urb->transfer_buffer);
301 kfree(as->urb->setup_packet);
302 usb_free_urb(as->urb);
303 usbfs_decrease_memory_usage(as->mem_usage);
304 kfree(as);
305 }
306
307 static void async_newpending(struct async *as)
308 {
309 struct dev_state *ps = as->ps;
310 unsigned long flags;
311
312 spin_lock_irqsave(&ps->lock, flags);
313 list_add_tail(&as->asynclist, &ps->async_pending);
314 spin_unlock_irqrestore(&ps->lock, flags);
315 }
316
317 static void async_removepending(struct async *as)
318 {
319 struct dev_state *ps = as->ps;
320 unsigned long flags;
321
322 spin_lock_irqsave(&ps->lock, flags);
323 list_del_init(&as->asynclist);
324 spin_unlock_irqrestore(&ps->lock, flags);
325 }
326
327 static struct async *async_getcompleted(struct dev_state *ps)
328 {
329 unsigned long flags;
330 struct async *as = NULL;
331
332 spin_lock_irqsave(&ps->lock, flags);
333 if (!list_empty(&ps->async_completed)) {
334 as = list_entry(ps->async_completed.next, struct async,
335 asynclist);
336 list_del_init(&as->asynclist);
337 }
338 spin_unlock_irqrestore(&ps->lock, flags);
339 return as;
340 }
341
342 static struct async *async_getpending(struct dev_state *ps,
343 void __user *userurb)
344 {
345 struct async *as;
346
347 list_for_each_entry(as, &ps->async_pending, asynclist)
348 if (as->userurb == userurb) {
349 list_del_init(&as->asynclist);
350 return as;
351 }
352
353 return NULL;
354 }
355
356 static void snoop_urb(struct usb_device *udev,
357 void __user *userurb, int pipe, unsigned length,
358 int timeout_or_status, enum snoop_when when,
359 unsigned char *data, unsigned data_len)
360 {
361 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
362 static const char *dirs[] = {"out", "in"};
363 int ep;
364 const char *t, *d;
365
366 if (!usbfs_snoop)
367 return;
368
369 ep = usb_pipeendpoint(pipe);
370 t = types[usb_pipetype(pipe)];
371 d = dirs[!!usb_pipein(pipe)];
372
373 if (userurb) { /* Async */
374 if (when == SUBMIT)
375 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
376 "length %u\n",
377 userurb, ep, t, d, length);
378 else
379 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
380 "actual_length %u status %d\n",
381 userurb, ep, t, d, length,
382 timeout_or_status);
383 } else {
384 if (when == SUBMIT)
385 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
386 "timeout %d\n",
387 ep, t, d, length, timeout_or_status);
388 else
389 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
390 "status %d\n",
391 ep, t, d, length, timeout_or_status);
392 }
393
394 if (data && data_len > 0) {
395 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
396 data, data_len, 1);
397 }
398 }
399
400 static void snoop_urb_data(struct urb *urb, unsigned len)
401 {
402 int i, size;
403
404 if (!usbfs_snoop)
405 return;
406
407 if (urb->num_sgs == 0) {
408 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
409 urb->transfer_buffer, len, 1);
410 return;
411 }
412
413 for (i = 0; i < urb->num_sgs && len; i++) {
414 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
415 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
416 sg_virt(&urb->sg[i]), size, 1);
417 len -= size;
418 }
419 }
420
421 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
422 {
423 unsigned i, len, size;
424
425 if (urb->number_of_packets > 0) /* Isochronous */
426 len = urb->transfer_buffer_length;
427 else /* Non-Isoc */
428 len = urb->actual_length;
429
430 if (urb->num_sgs == 0) {
431 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
432 return -EFAULT;
433 return 0;
434 }
435
436 for (i = 0; i < urb->num_sgs && len; i++) {
437 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
438 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
439 return -EFAULT;
440 userbuffer += size;
441 len -= size;
442 }
443
444 return 0;
445 }
446
447 #define AS_CONTINUATION 1
448 #define AS_UNLINK 2
449
450 static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr)
451 __releases(ps->lock)
452 __acquires(ps->lock)
453 {
454 struct urb *urb;
455 struct async *as;
456
457 /* Mark all the pending URBs that match bulk_addr, up to but not
458 * including the first one without AS_CONTINUATION. If such an
459 * URB is encountered then a new transfer has already started so
460 * the endpoint doesn't need to be disabled; otherwise it does.
461 */
462 list_for_each_entry(as, &ps->async_pending, asynclist) {
463 if (as->bulk_addr == bulk_addr) {
464 if (as->bulk_status != AS_CONTINUATION)
465 goto rescan;
466 as->bulk_status = AS_UNLINK;
467 as->bulk_addr = 0;
468 }
469 }
470 ps->disabled_bulk_eps |= (1 << bulk_addr);
471
472 /* Now carefully unlink all the marked pending URBs */
473 rescan:
474 list_for_each_entry(as, &ps->async_pending, asynclist) {
475 if (as->bulk_status == AS_UNLINK) {
476 as->bulk_status = 0; /* Only once */
477 urb = as->urb;
478 usb_get_urb(urb);
479 spin_unlock(&ps->lock); /* Allow completions */
480 usb_unlink_urb(urb);
481 usb_put_urb(urb);
482 spin_lock(&ps->lock);
483 goto rescan;
484 }
485 }
486 }
487
488 static void async_completed(struct urb *urb)
489 {
490 struct async *as = urb->context;
491 struct dev_state *ps = as->ps;
492 struct siginfo sinfo;
493 struct pid *pid = NULL;
494 u32 secid = 0;
495 const struct cred *cred = NULL;
496 int signr;
497
498 spin_lock(&ps->lock);
499 list_move_tail(&as->asynclist, &ps->async_completed);
500 as->status = urb->status;
501 signr = as->signr;
502 if (signr) {
503 sinfo.si_signo = as->signr;
504 sinfo.si_errno = as->status;
505 sinfo.si_code = SI_ASYNCIO;
506 sinfo.si_addr = as->userurb;
507 pid = get_pid(as->pid);
508 cred = get_cred(as->cred);
509 secid = as->secid;
510 }
511 snoop(&urb->dev->dev, "urb complete\n");
512 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
513 as->status, COMPLETE, NULL, 0);
514 if ((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_IN)
515 snoop_urb_data(urb, urb->actual_length);
516
517 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
518 as->status != -ENOENT)
519 cancel_bulk_urbs(ps, as->bulk_addr);
520 spin_unlock(&ps->lock);
521
522 if (signr) {
523 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
524 put_pid(pid);
525 put_cred(cred);
526 }
527
528 wake_up(&ps->wait);
529 }
530
531 static void destroy_async(struct dev_state *ps, struct list_head *list)
532 {
533 struct urb *urb;
534 struct async *as;
535 unsigned long flags;
536
537 spin_lock_irqsave(&ps->lock, flags);
538 while (!list_empty(list)) {
539 as = list_entry(list->next, struct async, asynclist);
540 list_del_init(&as->asynclist);
541 urb = as->urb;
542 usb_get_urb(urb);
543
544 /* drop the spinlock so the completion handler can run */
545 spin_unlock_irqrestore(&ps->lock, flags);
546 usb_kill_urb(urb);
547 usb_put_urb(urb);
548 spin_lock_irqsave(&ps->lock, flags);
549 }
550 spin_unlock_irqrestore(&ps->lock, flags);
551 }
552
553 static void destroy_async_on_interface(struct dev_state *ps,
554 unsigned int ifnum)
555 {
556 struct list_head *p, *q, hitlist;
557 unsigned long flags;
558
559 INIT_LIST_HEAD(&hitlist);
560 spin_lock_irqsave(&ps->lock, flags);
561 list_for_each_safe(p, q, &ps->async_pending)
562 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
563 list_move_tail(p, &hitlist);
564 spin_unlock_irqrestore(&ps->lock, flags);
565 destroy_async(ps, &hitlist);
566 }
567
568 static void destroy_all_async(struct dev_state *ps)
569 {
570 destroy_async(ps, &ps->async_pending);
571 }
572
573 /*
574 * interface claims are made only at the request of user level code,
575 * which can also release them (explicitly or by closing files).
576 * they're also undone when devices disconnect.
577 */
578
579 static int driver_probe(struct usb_interface *intf,
580 const struct usb_device_id *id)
581 {
582 return -ENODEV;
583 }
584
585 static void driver_disconnect(struct usb_interface *intf)
586 {
587 struct dev_state *ps = usb_get_intfdata(intf);
588 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
589
590 if (!ps)
591 return;
592
593 /* NOTE: this relies on usbcore having canceled and completed
594 * all pending I/O requests; 2.6 does that.
595 */
596
597 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
598 clear_bit(ifnum, &ps->ifclaimed);
599 else
600 dev_warn(&intf->dev, "interface number %u out of range\n",
601 ifnum);
602
603 usb_set_intfdata(intf, NULL);
604
605 /* force async requests to complete */
606 destroy_async_on_interface(ps, ifnum);
607 }
608
609 /* The following routines are merely placeholders. There is no way
610 * to inform a user task about suspend or resumes.
611 */
612 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
613 {
614 return 0;
615 }
616
617 static int driver_resume(struct usb_interface *intf)
618 {
619 return 0;
620 }
621
622 struct usb_driver usbfs_driver = {
623 .name = "usbfs",
624 .probe = driver_probe,
625 .disconnect = driver_disconnect,
626 .suspend = driver_suspend,
627 .resume = driver_resume,
628 };
629
630 static int claimintf(struct dev_state *ps, unsigned int ifnum)
631 {
632 struct usb_device *dev = ps->dev;
633 struct usb_interface *intf;
634 int err;
635
636 if (ifnum >= 8*sizeof(ps->ifclaimed))
637 return -EINVAL;
638 /* already claimed */
639 if (test_bit(ifnum, &ps->ifclaimed))
640 return 0;
641
642 intf = usb_ifnum_to_if(dev, ifnum);
643 if (!intf)
644 err = -ENOENT;
645 else
646 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
647 if (err == 0)
648 set_bit(ifnum, &ps->ifclaimed);
649 return err;
650 }
651
652 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
653 {
654 struct usb_device *dev;
655 struct usb_interface *intf;
656 int err;
657
658 err = -EINVAL;
659 if (ifnum >= 8*sizeof(ps->ifclaimed))
660 return err;
661 dev = ps->dev;
662 intf = usb_ifnum_to_if(dev, ifnum);
663 if (!intf)
664 err = -ENOENT;
665 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
666 usb_driver_release_interface(&usbfs_driver, intf);
667 err = 0;
668 }
669 return err;
670 }
671
672 static int checkintf(struct dev_state *ps, unsigned int ifnum)
673 {
674 if (ps->dev->state != USB_STATE_CONFIGURED)
675 return -EHOSTUNREACH;
676 if (ifnum >= 8*sizeof(ps->ifclaimed))
677 return -EINVAL;
678 if (test_bit(ifnum, &ps->ifclaimed))
679 return 0;
680 /* if not yet claimed, claim it for the driver */
681 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
682 "interface %u before use\n", task_pid_nr(current),
683 current->comm, ifnum);
684 return claimintf(ps, ifnum);
685 }
686
687 static int findintfep(struct usb_device *dev, unsigned int ep)
688 {
689 unsigned int i, j, e;
690 struct usb_interface *intf;
691 struct usb_host_interface *alts;
692 struct usb_endpoint_descriptor *endpt;
693
694 if (ep & ~(USB_DIR_IN|0xf))
695 return -EINVAL;
696 if (!dev->actconfig)
697 return -ESRCH;
698 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
699 intf = dev->actconfig->interface[i];
700 for (j = 0; j < intf->num_altsetting; j++) {
701 alts = &intf->altsetting[j];
702 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
703 endpt = &alts->endpoint[e].desc;
704 if (endpt->bEndpointAddress == ep)
705 return alts->desc.bInterfaceNumber;
706 }
707 }
708 }
709 return -ENOENT;
710 }
711
712 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
713 unsigned int request, unsigned int index)
714 {
715 int ret = 0;
716 struct usb_host_interface *alt_setting;
717
718 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
719 && ps->dev->state != USB_STATE_ADDRESS
720 && ps->dev->state != USB_STATE_CONFIGURED)
721 return -EHOSTUNREACH;
722 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
723 return 0;
724
725 /*
726 * check for the special corner case 'get_device_id' in the printer
727 * class specification, where wIndex is (interface << 8 | altsetting)
728 * instead of just interface
729 */
730 if (requesttype == 0xa1 && request == 0) {
731 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
732 index >> 8, index & 0xff);
733 if (alt_setting
734 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
735 index >>= 8;
736 }
737
738 index &= 0xff;
739 switch (requesttype & USB_RECIP_MASK) {
740 case USB_RECIP_ENDPOINT:
741 ret = findintfep(ps->dev, index);
742 if (ret >= 0)
743 ret = checkintf(ps, ret);
744 break;
745
746 case USB_RECIP_INTERFACE:
747 ret = checkintf(ps, index);
748 break;
749 }
750 return ret;
751 }
752
753 static int match_devt(struct device *dev, void *data)
754 {
755 return dev->devt == (dev_t) (unsigned long) data;
756 }
757
758 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
759 {
760 struct device *dev;
761
762 dev = bus_find_device(&usb_bus_type, NULL,
763 (void *) (unsigned long) devt, match_devt);
764 if (!dev)
765 return NULL;
766 return container_of(dev, struct usb_device, dev);
767 }
768
769 /*
770 * file operations
771 */
772 static int usbdev_open(struct inode *inode, struct file *file)
773 {
774 struct usb_device *dev = NULL;
775 struct dev_state *ps;
776 int ret;
777
778 ret = -ENOMEM;
779 ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
780 if (!ps)
781 goto out_free_ps;
782
783 ret = -ENODEV;
784
785 /* Protect against simultaneous removal or release */
786 mutex_lock(&usbfs_mutex);
787
788 /* usbdev device-node */
789 if (imajor(inode) == USB_DEVICE_MAJOR)
790 dev = usbdev_lookup_by_devt(inode->i_rdev);
791
792 mutex_unlock(&usbfs_mutex);
793
794 if (!dev)
795 goto out_free_ps;
796
797 usb_lock_device(dev);
798 if (dev->state == USB_STATE_NOTATTACHED)
799 goto out_unlock_device;
800
801 ret = usb_autoresume_device(dev);
802 if (ret)
803 goto out_unlock_device;
804
805 ps->dev = dev;
806 ps->file = file;
807 spin_lock_init(&ps->lock);
808 INIT_LIST_HEAD(&ps->list);
809 INIT_LIST_HEAD(&ps->async_pending);
810 INIT_LIST_HEAD(&ps->async_completed);
811 init_waitqueue_head(&ps->wait);
812 ps->discsignr = 0;
813 ps->disc_pid = get_pid(task_pid(current));
814 ps->cred = get_current_cred();
815 ps->disccontext = NULL;
816 ps->ifclaimed = 0;
817 security_task_getsecid(current, &ps->secid);
818 smp_wmb();
819 list_add_tail(&ps->list, &dev->filelist);
820 file->private_data = ps;
821 usb_unlock_device(dev);
822 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
823 current->comm);
824 return ret;
825
826 out_unlock_device:
827 usb_unlock_device(dev);
828 usb_put_dev(dev);
829 out_free_ps:
830 kfree(ps);
831 return ret;
832 }
833
834 static int usbdev_release(struct inode *inode, struct file *file)
835 {
836 struct dev_state *ps = file->private_data;
837 struct usb_device *dev = ps->dev;
838 unsigned int ifnum;
839 struct async *as;
840
841 usb_lock_device(dev);
842 usb_hub_release_all_ports(dev, ps);
843
844 list_del_init(&ps->list);
845
846 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
847 ifnum++) {
848 if (test_bit(ifnum, &ps->ifclaimed))
849 releaseintf(ps, ifnum);
850 }
851 destroy_all_async(ps);
852 usb_autosuspend_device(dev);
853 usb_unlock_device(dev);
854 usb_put_dev(dev);
855 put_pid(ps->disc_pid);
856 put_cred(ps->cred);
857
858 as = async_getcompleted(ps);
859 while (as) {
860 free_async(as);
861 as = async_getcompleted(ps);
862 }
863 kfree(ps);
864 return 0;
865 }
866
867 static int proc_control(struct dev_state *ps, void __user *arg)
868 {
869 struct usb_device *dev = ps->dev;
870 struct usbdevfs_ctrltransfer ctrl;
871 unsigned int tmo;
872 unsigned char *tbuf;
873 unsigned wLength;
874 int i, pipe, ret;
875
876 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
877 return -EFAULT;
878 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
879 ctrl.wIndex);
880 if (ret)
881 return ret;
882 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
883 if (wLength > PAGE_SIZE)
884 return -EINVAL;
885 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
886 sizeof(struct usb_ctrlrequest));
887 if (ret)
888 return ret;
889 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
890 if (!tbuf) {
891 ret = -ENOMEM;
892 goto done;
893 }
894 tmo = ctrl.timeout;
895 snoop(&dev->dev, "control urb: bRequestType=%02x "
896 "bRequest=%02x wValue=%04x "
897 "wIndex=%04x wLength=%04x\n",
898 ctrl.bRequestType, ctrl.bRequest,
899 __le16_to_cpup(&ctrl.wValue),
900 __le16_to_cpup(&ctrl.wIndex),
901 __le16_to_cpup(&ctrl.wLength));
902 if (ctrl.bRequestType & 0x80) {
903 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
904 ctrl.wLength)) {
905 ret = -EINVAL;
906 goto done;
907 }
908 pipe = usb_rcvctrlpipe(dev, 0);
909 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
910
911 usb_unlock_device(dev);
912 i = usb_control_msg(dev, pipe, ctrl.bRequest,
913 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
914 tbuf, ctrl.wLength, tmo);
915 usb_lock_device(dev);
916 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
917 tbuf, max(i, 0));
918 if ((i > 0) && ctrl.wLength) {
919 if (copy_to_user(ctrl.data, tbuf, i)) {
920 ret = -EFAULT;
921 goto done;
922 }
923 }
924 } else {
925 if (ctrl.wLength) {
926 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
927 ret = -EFAULT;
928 goto done;
929 }
930 }
931 pipe = usb_sndctrlpipe(dev, 0);
932 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
933 tbuf, ctrl.wLength);
934
935 usb_unlock_device(dev);
936 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
937 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
938 tbuf, ctrl.wLength, tmo);
939 usb_lock_device(dev);
940 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
941 }
942 if (i < 0 && i != -EPIPE) {
943 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
944 "failed cmd %s rqt %u rq %u len %u ret %d\n",
945 current->comm, ctrl.bRequestType, ctrl.bRequest,
946 ctrl.wLength, i);
947 }
948 ret = i;
949 done:
950 free_page((unsigned long) tbuf);
951 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
952 sizeof(struct usb_ctrlrequest));
953 return ret;
954 }
955
956 static int proc_bulk(struct dev_state *ps, void __user *arg)
957 {
958 struct usb_device *dev = ps->dev;
959 struct usbdevfs_bulktransfer bulk;
960 unsigned int tmo, len1, pipe;
961 int len2;
962 unsigned char *tbuf;
963 int i, ret;
964
965 if (copy_from_user(&bulk, arg, sizeof(bulk)))
966 return -EFAULT;
967 ret = findintfep(ps->dev, bulk.ep);
968 if (ret < 0)
969 return ret;
970 ret = checkintf(ps, ret);
971 if (ret)
972 return ret;
973 if (bulk.ep & USB_DIR_IN)
974 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
975 else
976 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
977 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
978 return -EINVAL;
979 len1 = bulk.len;
980 if (len1 >= USBFS_XFER_MAX)
981 return -EINVAL;
982 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
983 if (ret)
984 return ret;
985 if (!(tbuf = kmalloc(len1, GFP_KERNEL))) {
986 ret = -ENOMEM;
987 goto done;
988 }
989 tmo = bulk.timeout;
990 if (bulk.ep & 0x80) {
991 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
992 ret = -EINVAL;
993 goto done;
994 }
995 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
996
997 usb_unlock_device(dev);
998 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
999 usb_lock_device(dev);
1000 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1001
1002 if (!i && len2) {
1003 if (copy_to_user(bulk.data, tbuf, len2)) {
1004 ret = -EFAULT;
1005 goto done;
1006 }
1007 }
1008 } else {
1009 if (len1) {
1010 if (copy_from_user(tbuf, bulk.data, len1)) {
1011 ret = -EFAULT;
1012 goto done;
1013 }
1014 }
1015 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1016
1017 usb_unlock_device(dev);
1018 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1019 usb_lock_device(dev);
1020 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1021 }
1022 ret = (i < 0 ? i : len2);
1023 done:
1024 kfree(tbuf);
1025 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1026 return ret;
1027 }
1028
1029 static int proc_resetep(struct dev_state *ps, void __user *arg)
1030 {
1031 unsigned int ep;
1032 int ret;
1033
1034 if (get_user(ep, (unsigned int __user *)arg))
1035 return -EFAULT;
1036 ret = findintfep(ps->dev, ep);
1037 if (ret < 0)
1038 return ret;
1039 ret = checkintf(ps, ret);
1040 if (ret)
1041 return ret;
1042 usb_reset_endpoint(ps->dev, ep);
1043 return 0;
1044 }
1045
1046 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
1047 {
1048 unsigned int ep;
1049 int pipe;
1050 int ret;
1051
1052 if (get_user(ep, (unsigned int __user *)arg))
1053 return -EFAULT;
1054 ret = findintfep(ps->dev, ep);
1055 if (ret < 0)
1056 return ret;
1057 ret = checkintf(ps, ret);
1058 if (ret)
1059 return ret;
1060 if (ep & USB_DIR_IN)
1061 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1062 else
1063 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1064
1065 return usb_clear_halt(ps->dev, pipe);
1066 }
1067
1068 static int proc_getdriver(struct dev_state *ps, void __user *arg)
1069 {
1070 struct usbdevfs_getdriver gd;
1071 struct usb_interface *intf;
1072 int ret;
1073
1074 if (copy_from_user(&gd, arg, sizeof(gd)))
1075 return -EFAULT;
1076 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1077 if (!intf || !intf->dev.driver)
1078 ret = -ENODATA;
1079 else {
1080 strncpy(gd.driver, intf->dev.driver->name,
1081 sizeof(gd.driver));
1082 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1083 }
1084 return ret;
1085 }
1086
1087 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
1088 {
1089 struct usbdevfs_connectinfo ci = {
1090 .devnum = ps->dev->devnum,
1091 .slow = ps->dev->speed == USB_SPEED_LOW
1092 };
1093
1094 if (copy_to_user(arg, &ci, sizeof(ci)))
1095 return -EFAULT;
1096 return 0;
1097 }
1098
1099 static int proc_resetdevice(struct dev_state *ps)
1100 {
1101 return usb_reset_device(ps->dev);
1102 }
1103
1104 static int proc_setintf(struct dev_state *ps, void __user *arg)
1105 {
1106 struct usbdevfs_setinterface setintf;
1107 int ret;
1108
1109 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1110 return -EFAULT;
1111 if ((ret = checkintf(ps, setintf.interface)))
1112 return ret;
1113 return usb_set_interface(ps->dev, setintf.interface,
1114 setintf.altsetting);
1115 }
1116
1117 static int proc_setconfig(struct dev_state *ps, void __user *arg)
1118 {
1119 int u;
1120 int status = 0;
1121 struct usb_host_config *actconfig;
1122
1123 if (get_user(u, (int __user *)arg))
1124 return -EFAULT;
1125
1126 actconfig = ps->dev->actconfig;
1127
1128 /* Don't touch the device if any interfaces are claimed.
1129 * It could interfere with other drivers' operations, and if
1130 * an interface is claimed by usbfs it could easily deadlock.
1131 */
1132 if (actconfig) {
1133 int i;
1134
1135 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1136 if (usb_interface_claimed(actconfig->interface[i])) {
1137 dev_warn(&ps->dev->dev,
1138 "usbfs: interface %d claimed by %s "
1139 "while '%s' sets config #%d\n",
1140 actconfig->interface[i]
1141 ->cur_altsetting
1142 ->desc.bInterfaceNumber,
1143 actconfig->interface[i]
1144 ->dev.driver->name,
1145 current->comm, u);
1146 status = -EBUSY;
1147 break;
1148 }
1149 }
1150 }
1151
1152 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1153 * so avoid usb_set_configuration()'s kick to sysfs
1154 */
1155 if (status == 0) {
1156 if (actconfig && actconfig->desc.bConfigurationValue == u)
1157 status = usb_reset_configuration(ps->dev);
1158 else
1159 status = usb_set_configuration(ps->dev, u);
1160 }
1161
1162 return status;
1163 }
1164
1165 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1166 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1167 void __user *arg)
1168 {
1169 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1170 struct usb_host_endpoint *ep;
1171 struct async *as = NULL;
1172 struct usb_ctrlrequest *dr = NULL;
1173 unsigned int u, totlen, isofrmlen;
1174 int i, ret, is_in, num_sgs = 0, ifnum = -1;
1175 void *buf;
1176
1177 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1178 USBDEVFS_URB_SHORT_NOT_OK |
1179 USBDEVFS_URB_BULK_CONTINUATION |
1180 USBDEVFS_URB_NO_FSBR |
1181 USBDEVFS_URB_ZERO_PACKET |
1182 USBDEVFS_URB_NO_INTERRUPT))
1183 return -EINVAL;
1184 if (uurb->buffer_length > 0 && !uurb->buffer)
1185 return -EINVAL;
1186 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1187 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1188 ifnum = findintfep(ps->dev, uurb->endpoint);
1189 if (ifnum < 0)
1190 return ifnum;
1191 ret = checkintf(ps, ifnum);
1192 if (ret)
1193 return ret;
1194 }
1195 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1196 is_in = 1;
1197 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1198 } else {
1199 is_in = 0;
1200 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1201 }
1202 if (!ep)
1203 return -ENOENT;
1204
1205 u = 0;
1206 switch(uurb->type) {
1207 case USBDEVFS_URB_TYPE_CONTROL:
1208 if (!usb_endpoint_xfer_control(&ep->desc))
1209 return -EINVAL;
1210 /* min 8 byte setup packet */
1211 if (uurb->buffer_length < 8)
1212 return -EINVAL;
1213 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1214 if (!dr)
1215 return -ENOMEM;
1216 if (copy_from_user(dr, uurb->buffer, 8)) {
1217 ret = -EFAULT;
1218 goto error;
1219 }
1220 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1221 ret = -EINVAL;
1222 goto error;
1223 }
1224 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1225 le16_to_cpup(&dr->wIndex));
1226 if (ret)
1227 goto error;
1228 uurb->number_of_packets = 0;
1229 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1230 uurb->buffer += 8;
1231 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1232 is_in = 1;
1233 uurb->endpoint |= USB_DIR_IN;
1234 } else {
1235 is_in = 0;
1236 uurb->endpoint &= ~USB_DIR_IN;
1237 }
1238 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1239 "bRequest=%02x wValue=%04x "
1240 "wIndex=%04x wLength=%04x\n",
1241 dr->bRequestType, dr->bRequest,
1242 __le16_to_cpup(&dr->wValue),
1243 __le16_to_cpup(&dr->wIndex),
1244 __le16_to_cpup(&dr->wLength));
1245 u = sizeof(struct usb_ctrlrequest);
1246 break;
1247
1248 case USBDEVFS_URB_TYPE_BULK:
1249 switch (usb_endpoint_type(&ep->desc)) {
1250 case USB_ENDPOINT_XFER_CONTROL:
1251 case USB_ENDPOINT_XFER_ISOC:
1252 return -EINVAL;
1253 case USB_ENDPOINT_XFER_INT:
1254 /* allow single-shot interrupt transfers */
1255 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1256 goto interrupt_urb;
1257 }
1258 uurb->number_of_packets = 0;
1259 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1260 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1261 num_sgs = 0;
1262 break;
1263
1264 case USBDEVFS_URB_TYPE_INTERRUPT:
1265 if (!usb_endpoint_xfer_int(&ep->desc))
1266 return -EINVAL;
1267 interrupt_urb:
1268 uurb->number_of_packets = 0;
1269 break;
1270
1271 case USBDEVFS_URB_TYPE_ISO:
1272 /* arbitrary limit */
1273 if (uurb->number_of_packets < 1 ||
1274 uurb->number_of_packets > 128)
1275 return -EINVAL;
1276 if (!usb_endpoint_xfer_isoc(&ep->desc))
1277 return -EINVAL;
1278 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1279 uurb->number_of_packets;
1280 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1281 return -ENOMEM;
1282 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1283 ret = -EFAULT;
1284 goto error;
1285 }
1286 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1287 /* arbitrary limit,
1288 * sufficient for USB 2.0 high-bandwidth iso */
1289 if (isopkt[u].length > 8192) {
1290 ret = -EINVAL;
1291 goto error;
1292 }
1293 totlen += isopkt[u].length;
1294 }
1295 u *= sizeof(struct usb_iso_packet_descriptor);
1296 uurb->buffer_length = totlen;
1297 break;
1298
1299 default:
1300 return -EINVAL;
1301 }
1302
1303 if (uurb->buffer_length >= USBFS_XFER_MAX) {
1304 ret = -EINVAL;
1305 goto error;
1306 }
1307 if (uurb->buffer_length > 0 &&
1308 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1309 uurb->buffer, uurb->buffer_length)) {
1310 ret = -EFAULT;
1311 goto error;
1312 }
1313 as = alloc_async(uurb->number_of_packets);
1314 if (!as) {
1315 ret = -ENOMEM;
1316 goto error;
1317 }
1318
1319 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1320 num_sgs * sizeof(struct scatterlist);
1321 ret = usbfs_increase_memory_usage(u);
1322 if (ret)
1323 goto error;
1324 as->mem_usage = u;
1325
1326 if (num_sgs) {
1327 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1328 GFP_KERNEL);
1329 if (!as->urb->sg) {
1330 ret = -ENOMEM;
1331 goto error;
1332 }
1333 as->urb->num_sgs = num_sgs;
1334 sg_init_table(as->urb->sg, as->urb->num_sgs);
1335
1336 totlen = uurb->buffer_length;
1337 for (i = 0; i < as->urb->num_sgs; i++) {
1338 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1339 buf = kmalloc(u, GFP_KERNEL);
1340 if (!buf) {
1341 ret = -ENOMEM;
1342 goto error;
1343 }
1344 sg_set_buf(&as->urb->sg[i], buf, u);
1345
1346 if (!is_in) {
1347 if (copy_from_user(buf, uurb->buffer, u)) {
1348 ret = -EFAULT;
1349 goto error;
1350 }
1351 uurb->buffer += u;
1352 }
1353 totlen -= u;
1354 }
1355 } else if (uurb->buffer_length > 0) {
1356 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1357 GFP_KERNEL);
1358 if (!as->urb->transfer_buffer) {
1359 ret = -ENOMEM;
1360 goto error;
1361 }
1362
1363 if (!is_in) {
1364 if (copy_from_user(as->urb->transfer_buffer,
1365 uurb->buffer,
1366 uurb->buffer_length)) {
1367 ret = -EFAULT;
1368 goto error;
1369 }
1370 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1371 /*
1372 * Isochronous input data may end up being
1373 * discontiguous if some of the packets are short.
1374 * Clear the buffer so that the gaps don't leak
1375 * kernel data to userspace.
1376 */
1377 memset(as->urb->transfer_buffer, 0,
1378 uurb->buffer_length);
1379 }
1380 }
1381 as->urb->dev = ps->dev;
1382 as->urb->pipe = (uurb->type << 30) |
1383 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1384 (uurb->endpoint & USB_DIR_IN);
1385
1386 /* This tedious sequence is necessary because the URB_* flags
1387 * are internal to the kernel and subject to change, whereas
1388 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1389 */
1390 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1391 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1392 u |= URB_ISO_ASAP;
1393 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1394 u |= URB_SHORT_NOT_OK;
1395 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1396 u |= URB_NO_FSBR;
1397 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1398 u |= URB_ZERO_PACKET;
1399 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1400 u |= URB_NO_INTERRUPT;
1401 as->urb->transfer_flags = u;
1402
1403 as->urb->transfer_buffer_length = uurb->buffer_length;
1404 as->urb->setup_packet = (unsigned char *)dr;
1405 dr = NULL;
1406 as->urb->start_frame = uurb->start_frame;
1407 as->urb->number_of_packets = uurb->number_of_packets;
1408 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1409 ps->dev->speed == USB_SPEED_HIGH)
1410 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1411 else
1412 as->urb->interval = ep->desc.bInterval;
1413 as->urb->context = as;
1414 as->urb->complete = async_completed;
1415 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1416 as->urb->iso_frame_desc[u].offset = totlen;
1417 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1418 totlen += isopkt[u].length;
1419 }
1420 kfree(isopkt);
1421 isopkt = NULL;
1422 as->ps = ps;
1423 as->userurb = arg;
1424 if (is_in && uurb->buffer_length > 0)
1425 as->userbuffer = uurb->buffer;
1426 else
1427 as->userbuffer = NULL;
1428 as->signr = uurb->signr;
1429 as->ifnum = ifnum;
1430 as->pid = get_pid(task_pid(current));
1431 as->cred = get_current_cred();
1432 security_task_getsecid(current, &as->secid);
1433 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1434 as->urb->transfer_buffer_length, 0, SUBMIT,
1435 NULL, 0);
1436 if (!is_in)
1437 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1438
1439 async_newpending(as);
1440
1441 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1442 spin_lock_irq(&ps->lock);
1443
1444 /* Not exactly the endpoint address; the direction bit is
1445 * shifted to the 0x10 position so that the value will be
1446 * between 0 and 31.
1447 */
1448 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1449 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1450 >> 3);
1451
1452 /* If this bulk URB is the start of a new transfer, re-enable
1453 * the endpoint. Otherwise mark it as a continuation URB.
1454 */
1455 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1456 as->bulk_status = AS_CONTINUATION;
1457 else
1458 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1459
1460 /* Don't accept continuation URBs if the endpoint is
1461 * disabled because of an earlier error.
1462 */
1463 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1464 ret = -EREMOTEIO;
1465 else
1466 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1467 spin_unlock_irq(&ps->lock);
1468 } else {
1469 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1470 }
1471
1472 if (ret) {
1473 dev_printk(KERN_DEBUG, &ps->dev->dev,
1474 "usbfs: usb_submit_urb returned %d\n", ret);
1475 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1476 0, ret, COMPLETE, NULL, 0);
1477 async_removepending(as);
1478 goto error;
1479 }
1480 return 0;
1481
1482 error:
1483 kfree(isopkt);
1484 kfree(dr);
1485 if (as)
1486 free_async(as);
1487 return ret;
1488 }
1489
1490 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1491 {
1492 struct usbdevfs_urb uurb;
1493
1494 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1495 return -EFAULT;
1496
1497 return proc_do_submiturb(ps, &uurb,
1498 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1499 arg);
1500 }
1501
1502 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1503 {
1504 struct urb *urb;
1505 struct async *as;
1506 unsigned long flags;
1507
1508 spin_lock_irqsave(&ps->lock, flags);
1509 as = async_getpending(ps, arg);
1510 if (!as) {
1511 spin_unlock_irqrestore(&ps->lock, flags);
1512 return -EINVAL;
1513 }
1514
1515 urb = as->urb;
1516 usb_get_urb(urb);
1517 spin_unlock_irqrestore(&ps->lock, flags);
1518
1519 usb_kill_urb(urb);
1520 usb_put_urb(urb);
1521
1522 return 0;
1523 }
1524
1525 static int processcompl(struct async *as, void __user * __user *arg)
1526 {
1527 struct urb *urb = as->urb;
1528 struct usbdevfs_urb __user *userurb = as->userurb;
1529 void __user *addr = as->userurb;
1530 unsigned int i;
1531
1532 if (as->userbuffer && urb->actual_length) {
1533 if (copy_urb_data_to_user(as->userbuffer, urb))
1534 goto err_out;
1535 }
1536 if (put_user(as->status, &userurb->status))
1537 goto err_out;
1538 if (put_user(urb->actual_length, &userurb->actual_length))
1539 goto err_out;
1540 if (put_user(urb->error_count, &userurb->error_count))
1541 goto err_out;
1542
1543 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1544 for (i = 0; i < urb->number_of_packets; i++) {
1545 if (put_user(urb->iso_frame_desc[i].actual_length,
1546 &userurb->iso_frame_desc[i].actual_length))
1547 goto err_out;
1548 if (put_user(urb->iso_frame_desc[i].status,
1549 &userurb->iso_frame_desc[i].status))
1550 goto err_out;
1551 }
1552 }
1553
1554 if (put_user(addr, (void __user * __user *)arg))
1555 return -EFAULT;
1556 return 0;
1557
1558 err_out:
1559 return -EFAULT;
1560 }
1561
1562 static struct async *reap_as(struct dev_state *ps)
1563 {
1564 DECLARE_WAITQUEUE(wait, current);
1565 struct async *as = NULL;
1566 struct usb_device *dev = ps->dev;
1567
1568 add_wait_queue(&ps->wait, &wait);
1569 for (;;) {
1570 __set_current_state(TASK_INTERRUPTIBLE);
1571 as = async_getcompleted(ps);
1572 if (as)
1573 break;
1574 if (signal_pending(current))
1575 break;
1576 usb_unlock_device(dev);
1577 schedule();
1578 usb_lock_device(dev);
1579 }
1580 remove_wait_queue(&ps->wait, &wait);
1581 set_current_state(TASK_RUNNING);
1582 return as;
1583 }
1584
1585 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1586 {
1587 struct async *as = reap_as(ps);
1588 if (as) {
1589 int retval = processcompl(as, (void __user * __user *)arg);
1590 free_async(as);
1591 return retval;
1592 }
1593 if (signal_pending(current))
1594 return -EINTR;
1595 return -EIO;
1596 }
1597
1598 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1599 {
1600 int retval;
1601 struct async *as;
1602
1603 as = async_getcompleted(ps);
1604 retval = -EAGAIN;
1605 if (as) {
1606 retval = processcompl(as, (void __user * __user *)arg);
1607 free_async(as);
1608 }
1609 return retval;
1610 }
1611
1612 #ifdef CONFIG_COMPAT
1613 static int proc_control_compat(struct dev_state *ps,
1614 struct usbdevfs_ctrltransfer32 __user *p32)
1615 {
1616 struct usbdevfs_ctrltransfer __user *p;
1617 __u32 udata;
1618 p = compat_alloc_user_space(sizeof(*p));
1619 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1620 get_user(udata, &p32->data) ||
1621 put_user(compat_ptr(udata), &p->data))
1622 return -EFAULT;
1623 return proc_control(ps, p);
1624 }
1625
1626 static int proc_bulk_compat(struct dev_state *ps,
1627 struct usbdevfs_bulktransfer32 __user *p32)
1628 {
1629 struct usbdevfs_bulktransfer __user *p;
1630 compat_uint_t n;
1631 compat_caddr_t addr;
1632
1633 p = compat_alloc_user_space(sizeof(*p));
1634
1635 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1636 get_user(n, &p32->len) || put_user(n, &p->len) ||
1637 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1638 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1639 return -EFAULT;
1640
1641 return proc_bulk(ps, p);
1642 }
1643 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1644 {
1645 struct usbdevfs_disconnectsignal32 ds;
1646
1647 if (copy_from_user(&ds, arg, sizeof(ds)))
1648 return -EFAULT;
1649 ps->discsignr = ds.signr;
1650 ps->disccontext = compat_ptr(ds.context);
1651 return 0;
1652 }
1653
1654 static int get_urb32(struct usbdevfs_urb *kurb,
1655 struct usbdevfs_urb32 __user *uurb)
1656 {
1657 __u32 uptr;
1658 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1659 __get_user(kurb->type, &uurb->type) ||
1660 __get_user(kurb->endpoint, &uurb->endpoint) ||
1661 __get_user(kurb->status, &uurb->status) ||
1662 __get_user(kurb->flags, &uurb->flags) ||
1663 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1664 __get_user(kurb->actual_length, &uurb->actual_length) ||
1665 __get_user(kurb->start_frame, &uurb->start_frame) ||
1666 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1667 __get_user(kurb->error_count, &uurb->error_count) ||
1668 __get_user(kurb->signr, &uurb->signr))
1669 return -EFAULT;
1670
1671 if (__get_user(uptr, &uurb->buffer))
1672 return -EFAULT;
1673 kurb->buffer = compat_ptr(uptr);
1674 if (__get_user(uptr, &uurb->usercontext))
1675 return -EFAULT;
1676 kurb->usercontext = compat_ptr(uptr);
1677
1678 return 0;
1679 }
1680
1681 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1682 {
1683 struct usbdevfs_urb uurb;
1684
1685 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1686 return -EFAULT;
1687
1688 return proc_do_submiturb(ps, &uurb,
1689 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1690 arg);
1691 }
1692
1693 static int processcompl_compat(struct async *as, void __user * __user *arg)
1694 {
1695 struct urb *urb = as->urb;
1696 struct usbdevfs_urb32 __user *userurb = as->userurb;
1697 void __user *addr = as->userurb;
1698 unsigned int i;
1699
1700 if (as->userbuffer && urb->actual_length) {
1701 if (copy_urb_data_to_user(as->userbuffer, urb))
1702 return -EFAULT;
1703 }
1704 if (put_user(as->status, &userurb->status))
1705 return -EFAULT;
1706 if (put_user(urb->actual_length, &userurb->actual_length))
1707 return -EFAULT;
1708 if (put_user(urb->error_count, &userurb->error_count))
1709 return -EFAULT;
1710
1711 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1712 for (i = 0; i < urb->number_of_packets; i++) {
1713 if (put_user(urb->iso_frame_desc[i].actual_length,
1714 &userurb->iso_frame_desc[i].actual_length))
1715 return -EFAULT;
1716 if (put_user(urb->iso_frame_desc[i].status,
1717 &userurb->iso_frame_desc[i].status))
1718 return -EFAULT;
1719 }
1720 }
1721
1722 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1723 return -EFAULT;
1724 return 0;
1725 }
1726
1727 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1728 {
1729 struct async *as = reap_as(ps);
1730 if (as) {
1731 int retval = processcompl_compat(as, (void __user * __user *)arg);
1732 free_async(as);
1733 return retval;
1734 }
1735 if (signal_pending(current))
1736 return -EINTR;
1737 return -EIO;
1738 }
1739
1740 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1741 {
1742 int retval;
1743 struct async *as;
1744
1745 retval = -EAGAIN;
1746 as = async_getcompleted(ps);
1747 if (as) {
1748 retval = processcompl_compat(as, (void __user * __user *)arg);
1749 free_async(as);
1750 }
1751 return retval;
1752 }
1753
1754
1755 #endif
1756
1757 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1758 {
1759 struct usbdevfs_disconnectsignal ds;
1760
1761 if (copy_from_user(&ds, arg, sizeof(ds)))
1762 return -EFAULT;
1763 ps->discsignr = ds.signr;
1764 ps->disccontext = ds.context;
1765 return 0;
1766 }
1767
1768 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1769 {
1770 unsigned int ifnum;
1771
1772 if (get_user(ifnum, (unsigned int __user *)arg))
1773 return -EFAULT;
1774 return claimintf(ps, ifnum);
1775 }
1776
1777 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1778 {
1779 unsigned int ifnum;
1780 int ret;
1781
1782 if (get_user(ifnum, (unsigned int __user *)arg))
1783 return -EFAULT;
1784 if ((ret = releaseintf(ps, ifnum)) < 0)
1785 return ret;
1786 destroy_async_on_interface (ps, ifnum);
1787 return 0;
1788 }
1789
1790 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1791 {
1792 int size;
1793 void *buf = NULL;
1794 int retval = 0;
1795 struct usb_interface *intf = NULL;
1796 struct usb_driver *driver = NULL;
1797
1798 /* alloc buffer */
1799 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1800 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1801 return -ENOMEM;
1802 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1803 if (copy_from_user(buf, ctl->data, size)) {
1804 kfree(buf);
1805 return -EFAULT;
1806 }
1807 } else {
1808 memset(buf, 0, size);
1809 }
1810 }
1811
1812 if (!connected(ps)) {
1813 kfree(buf);
1814 return -ENODEV;
1815 }
1816
1817 if (ps->dev->state != USB_STATE_CONFIGURED)
1818 retval = -EHOSTUNREACH;
1819 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1820 retval = -EINVAL;
1821 else switch (ctl->ioctl_code) {
1822
1823 /* disconnect kernel driver from interface */
1824 case USBDEVFS_DISCONNECT:
1825 if (intf->dev.driver) {
1826 driver = to_usb_driver(intf->dev.driver);
1827 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1828 usb_driver_release_interface(driver, intf);
1829 } else
1830 retval = -ENODATA;
1831 break;
1832
1833 /* let kernel drivers try to (re)bind to the interface */
1834 case USBDEVFS_CONNECT:
1835 if (!intf->dev.driver)
1836 retval = device_attach(&intf->dev);
1837 else
1838 retval = -EBUSY;
1839 break;
1840
1841 /* talk directly to the interface's driver */
1842 default:
1843 if (intf->dev.driver)
1844 driver = to_usb_driver(intf->dev.driver);
1845 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1846 retval = -ENOTTY;
1847 } else {
1848 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1849 if (retval == -ENOIOCTLCMD)
1850 retval = -ENOTTY;
1851 }
1852 }
1853
1854 /* cleanup and return */
1855 if (retval >= 0
1856 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1857 && size > 0
1858 && copy_to_user(ctl->data, buf, size) != 0)
1859 retval = -EFAULT;
1860
1861 kfree(buf);
1862 return retval;
1863 }
1864
1865 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1866 {
1867 struct usbdevfs_ioctl ctrl;
1868
1869 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1870 return -EFAULT;
1871 return proc_ioctl(ps, &ctrl);
1872 }
1873
1874 #ifdef CONFIG_COMPAT
1875 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1876 {
1877 struct usbdevfs_ioctl32 __user *uioc;
1878 struct usbdevfs_ioctl ctrl;
1879 u32 udata;
1880
1881 uioc = compat_ptr((long)arg);
1882 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1883 __get_user(ctrl.ifno, &uioc->ifno) ||
1884 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1885 __get_user(udata, &uioc->data))
1886 return -EFAULT;
1887 ctrl.data = compat_ptr(udata);
1888
1889 return proc_ioctl(ps, &ctrl);
1890 }
1891 #endif
1892
1893 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1894 {
1895 unsigned portnum;
1896 int rc;
1897
1898 if (get_user(portnum, (unsigned __user *) arg))
1899 return -EFAULT;
1900 rc = usb_hub_claim_port(ps->dev, portnum, ps);
1901 if (rc == 0)
1902 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1903 portnum, task_pid_nr(current), current->comm);
1904 return rc;
1905 }
1906
1907 static int proc_release_port(struct dev_state *ps, void __user *arg)
1908 {
1909 unsigned portnum;
1910
1911 if (get_user(portnum, (unsigned __user *) arg))
1912 return -EFAULT;
1913 return usb_hub_release_port(ps->dev, portnum, ps);
1914 }
1915
1916 static int proc_get_capabilities(struct dev_state *ps, void __user *arg)
1917 {
1918 __u32 caps;
1919
1920 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM;
1921 if (!ps->dev->bus->no_stop_on_short)
1922 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
1923 if (ps->dev->bus->sg_tablesize)
1924 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
1925
1926 if (put_user(caps, (__u32 __user *)arg))
1927 return -EFAULT;
1928
1929 return 0;
1930 }
1931
1932 static int proc_disconnect_claim(struct dev_state *ps, void __user *arg)
1933 {
1934 struct usbdevfs_disconnect_claim dc;
1935 struct usb_interface *intf;
1936
1937 if (copy_from_user(&dc, arg, sizeof(dc)))
1938 return -EFAULT;
1939
1940 intf = usb_ifnum_to_if(ps->dev, dc.interface);
1941 if (!intf)
1942 return -EINVAL;
1943
1944 if (intf->dev.driver) {
1945 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
1946
1947 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
1948 strncmp(dc.driver, intf->dev.driver->name,
1949 sizeof(dc.driver)) != 0)
1950 return -EBUSY;
1951
1952 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
1953 strncmp(dc.driver, intf->dev.driver->name,
1954 sizeof(dc.driver)) == 0)
1955 return -EBUSY;
1956
1957 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1958 usb_driver_release_interface(driver, intf);
1959 }
1960
1961 return claimintf(ps, dc.interface);
1962 }
1963
1964 /*
1965 * NOTE: All requests here that have interface numbers as parameters
1966 * are assuming that somehow the configuration has been prevented from
1967 * changing. But there's no mechanism to ensure that...
1968 */
1969 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1970 void __user *p)
1971 {
1972 struct dev_state *ps = file->private_data;
1973 struct inode *inode = file_inode(file);
1974 struct usb_device *dev = ps->dev;
1975 int ret = -ENOTTY;
1976
1977 if (!(file->f_mode & FMODE_WRITE))
1978 return -EPERM;
1979
1980 usb_lock_device(dev);
1981 if (!connected(ps)) {
1982 usb_unlock_device(dev);
1983 return -ENODEV;
1984 }
1985
1986 switch (cmd) {
1987 case USBDEVFS_CONTROL:
1988 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1989 ret = proc_control(ps, p);
1990 if (ret >= 0)
1991 inode->i_mtime = CURRENT_TIME;
1992 break;
1993
1994 case USBDEVFS_BULK:
1995 snoop(&dev->dev, "%s: BULK\n", __func__);
1996 ret = proc_bulk(ps, p);
1997 if (ret >= 0)
1998 inode->i_mtime = CURRENT_TIME;
1999 break;
2000
2001 case USBDEVFS_RESETEP:
2002 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2003 ret = proc_resetep(ps, p);
2004 if (ret >= 0)
2005 inode->i_mtime = CURRENT_TIME;
2006 break;
2007
2008 case USBDEVFS_RESET:
2009 snoop(&dev->dev, "%s: RESET\n", __func__);
2010 ret = proc_resetdevice(ps);
2011 break;
2012
2013 case USBDEVFS_CLEAR_HALT:
2014 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2015 ret = proc_clearhalt(ps, p);
2016 if (ret >= 0)
2017 inode->i_mtime = CURRENT_TIME;
2018 break;
2019
2020 case USBDEVFS_GETDRIVER:
2021 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2022 ret = proc_getdriver(ps, p);
2023 break;
2024
2025 case USBDEVFS_CONNECTINFO:
2026 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2027 ret = proc_connectinfo(ps, p);
2028 break;
2029
2030 case USBDEVFS_SETINTERFACE:
2031 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2032 ret = proc_setintf(ps, p);
2033 break;
2034
2035 case USBDEVFS_SETCONFIGURATION:
2036 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2037 ret = proc_setconfig(ps, p);
2038 break;
2039
2040 case USBDEVFS_SUBMITURB:
2041 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2042 ret = proc_submiturb(ps, p);
2043 if (ret >= 0)
2044 inode->i_mtime = CURRENT_TIME;
2045 break;
2046
2047 #ifdef CONFIG_COMPAT
2048 case USBDEVFS_CONTROL32:
2049 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2050 ret = proc_control_compat(ps, p);
2051 if (ret >= 0)
2052 inode->i_mtime = CURRENT_TIME;
2053 break;
2054
2055 case USBDEVFS_BULK32:
2056 snoop(&dev->dev, "%s: BULK32\n", __func__);
2057 ret = proc_bulk_compat(ps, p);
2058 if (ret >= 0)
2059 inode->i_mtime = CURRENT_TIME;
2060 break;
2061
2062 case USBDEVFS_DISCSIGNAL32:
2063 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2064 ret = proc_disconnectsignal_compat(ps, p);
2065 break;
2066
2067 case USBDEVFS_SUBMITURB32:
2068 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2069 ret = proc_submiturb_compat(ps, p);
2070 if (ret >= 0)
2071 inode->i_mtime = CURRENT_TIME;
2072 break;
2073
2074 case USBDEVFS_REAPURB32:
2075 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2076 ret = proc_reapurb_compat(ps, p);
2077 break;
2078
2079 case USBDEVFS_REAPURBNDELAY32:
2080 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2081 ret = proc_reapurbnonblock_compat(ps, p);
2082 break;
2083
2084 case USBDEVFS_IOCTL32:
2085 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2086 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2087 break;
2088 #endif
2089
2090 case USBDEVFS_DISCARDURB:
2091 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
2092 ret = proc_unlinkurb(ps, p);
2093 break;
2094
2095 case USBDEVFS_REAPURB:
2096 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2097 ret = proc_reapurb(ps, p);
2098 break;
2099
2100 case USBDEVFS_REAPURBNDELAY:
2101 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2102 ret = proc_reapurbnonblock(ps, p);
2103 break;
2104
2105 case USBDEVFS_DISCSIGNAL:
2106 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2107 ret = proc_disconnectsignal(ps, p);
2108 break;
2109
2110 case USBDEVFS_CLAIMINTERFACE:
2111 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2112 ret = proc_claiminterface(ps, p);
2113 break;
2114
2115 case USBDEVFS_RELEASEINTERFACE:
2116 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2117 ret = proc_releaseinterface(ps, p);
2118 break;
2119
2120 case USBDEVFS_IOCTL:
2121 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2122 ret = proc_ioctl_default(ps, p);
2123 break;
2124
2125 case USBDEVFS_CLAIM_PORT:
2126 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2127 ret = proc_claim_port(ps, p);
2128 break;
2129
2130 case USBDEVFS_RELEASE_PORT:
2131 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2132 ret = proc_release_port(ps, p);
2133 break;
2134 case USBDEVFS_GET_CAPABILITIES:
2135 ret = proc_get_capabilities(ps, p);
2136 break;
2137 case USBDEVFS_DISCONNECT_CLAIM:
2138 ret = proc_disconnect_claim(ps, p);
2139 break;
2140 }
2141 usb_unlock_device(dev);
2142 if (ret >= 0)
2143 inode->i_atime = CURRENT_TIME;
2144 return ret;
2145 }
2146
2147 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2148 unsigned long arg)
2149 {
2150 int ret;
2151
2152 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2153
2154 return ret;
2155 }
2156
2157 #ifdef CONFIG_COMPAT
2158 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2159 unsigned long arg)
2160 {
2161 int ret;
2162
2163 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2164
2165 return ret;
2166 }
2167 #endif
2168
2169 /* No kernel lock - fine */
2170 static unsigned int usbdev_poll(struct file *file,
2171 struct poll_table_struct *wait)
2172 {
2173 struct dev_state *ps = file->private_data;
2174 unsigned int mask = 0;
2175
2176 poll_wait(file, &ps->wait, wait);
2177 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2178 mask |= POLLOUT | POLLWRNORM;
2179 if (!connected(ps))
2180 mask |= POLLERR | POLLHUP;
2181 return mask;
2182 }
2183
2184 const struct file_operations usbdev_file_operations = {
2185 .owner = THIS_MODULE,
2186 .llseek = usbdev_lseek,
2187 .read = usbdev_read,
2188 .poll = usbdev_poll,
2189 .unlocked_ioctl = usbdev_ioctl,
2190 #ifdef CONFIG_COMPAT
2191 .compat_ioctl = usbdev_compat_ioctl,
2192 #endif
2193 .open = usbdev_open,
2194 .release = usbdev_release,
2195 };
2196
2197 static void usbdev_remove(struct usb_device *udev)
2198 {
2199 struct dev_state *ps;
2200 struct siginfo sinfo;
2201
2202 while (!list_empty(&udev->filelist)) {
2203 ps = list_entry(udev->filelist.next, struct dev_state, list);
2204 destroy_all_async(ps);
2205 wake_up_all(&ps->wait);
2206 list_del_init(&ps->list);
2207 if (ps->discsignr) {
2208 sinfo.si_signo = ps->discsignr;
2209 sinfo.si_errno = EPIPE;
2210 sinfo.si_code = SI_ASYNCIO;
2211 sinfo.si_addr = ps->disccontext;
2212 kill_pid_info_as_cred(ps->discsignr, &sinfo,
2213 ps->disc_pid, ps->cred, ps->secid);
2214 }
2215 }
2216 }
2217
2218 static int usbdev_notify(struct notifier_block *self,
2219 unsigned long action, void *dev)
2220 {
2221 switch (action) {
2222 case USB_DEVICE_ADD:
2223 break;
2224 case USB_DEVICE_REMOVE:
2225 usbdev_remove(dev);
2226 break;
2227 }
2228 return NOTIFY_OK;
2229 }
2230
2231 static struct notifier_block usbdev_nb = {
2232 .notifier_call = usbdev_notify,
2233 };
2234
2235 static struct cdev usb_device_cdev;
2236
2237 int __init usb_devio_init(void)
2238 {
2239 int retval;
2240
2241 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2242 "usb_device");
2243 if (retval) {
2244 printk(KERN_ERR "Unable to register minors for usb_device\n");
2245 goto out;
2246 }
2247 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2248 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2249 if (retval) {
2250 printk(KERN_ERR "Unable to get usb_device major %d\n",
2251 USB_DEVICE_MAJOR);
2252 goto error_cdev;
2253 }
2254 usb_register_notify(&usbdev_nb);
2255 out:
2256 return retval;
2257
2258 error_cdev:
2259 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2260 goto out;
2261 }
2262
2263 void usb_devio_cleanup(void)
2264 {
2265 usb_unregister_notify(&usbdev_nb);
2266 cdev_del(&usb_device_cdev);
2267 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2268 }
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