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Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[deliverable/linux.git] / drivers / usb / core / devio.c
1 /*****************************************************************************/
2
3 /*
4 * devio.c -- User space communication with USB devices.
5 *
6 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 * This file implements the usbfs/x/y files, where
23 * x is the bus number and y the device number.
24 *
25 * It allows user space programs/"drivers" to communicate directly
26 * with USB devices without intervening kernel driver.
27 *
28 * Revision history
29 * 22.12.1999 0.1 Initial release (split from proc_usb.c)
30 * 04.01.2000 0.2 Turned into its own filesystem
31 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
32 * (CAN-2005-3055)
33 */
34
35 /*****************************************************************************/
36
37 #include <linux/fs.h>
38 #include <linux/mm.h>
39 #include <linux/slab.h>
40 #include <linux/signal.h>
41 #include <linux/poll.h>
42 #include <linux/module.h>
43 #include <linux/string.h>
44 #include <linux/usb.h>
45 #include <linux/usbdevice_fs.h>
46 #include <linux/usb/hcd.h> /* for usbcore internals */
47 #include <linux/cdev.h>
48 #include <linux/notifier.h>
49 #include <linux/security.h>
50 #include <linux/user_namespace.h>
51 #include <linux/scatterlist.h>
52 #include <linux/uaccess.h>
53 #include <asm/byteorder.h>
54 #include <linux/moduleparam.h>
55
56 #include "usb.h"
57
58 #define USB_MAXBUS 64
59 #define USB_DEVICE_MAX (USB_MAXBUS * 128)
60 #define USB_SG_SIZE 16384 /* split-size for large txs */
61
62 /* Mutual exclusion for removal, open, and release */
63 DEFINE_MUTEX(usbfs_mutex);
64
65 struct dev_state {
66 struct list_head list; /* state list */
67 struct usb_device *dev;
68 struct file *file;
69 spinlock_t lock; /* protects the async urb lists */
70 struct list_head async_pending;
71 struct list_head async_completed;
72 wait_queue_head_t wait; /* wake up if a request completed */
73 unsigned int discsignr;
74 struct pid *disc_pid;
75 const struct cred *cred;
76 void __user *disccontext;
77 unsigned long ifclaimed;
78 u32 secid;
79 u32 disabled_bulk_eps;
80 };
81
82 struct async {
83 struct list_head asynclist;
84 struct dev_state *ps;
85 struct pid *pid;
86 const struct cred *cred;
87 unsigned int signr;
88 unsigned int ifnum;
89 void __user *userbuffer;
90 void __user *userurb;
91 struct urb *urb;
92 unsigned int mem_usage;
93 int status;
94 u32 secid;
95 u8 bulk_addr;
96 u8 bulk_status;
97 };
98
99 static bool usbfs_snoop;
100 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
101 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
102
103 #define snoop(dev, format, arg...) \
104 do { \
105 if (usbfs_snoop) \
106 dev_info(dev , format , ## arg); \
107 } while (0)
108
109 enum snoop_when {
110 SUBMIT, COMPLETE
111 };
112
113 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
114
115 /* Limit on the total amount of memory we can allocate for transfers */
116 static unsigned usbfs_memory_mb = 16;
117 module_param(usbfs_memory_mb, uint, 0644);
118 MODULE_PARM_DESC(usbfs_memory_mb,
119 "maximum MB allowed for usbfs buffers (0 = no limit)");
120
121 /* Hard limit, necessary to avoid arithmetic overflow */
122 #define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
123
124 static atomic_t usbfs_memory_usage; /* Total memory currently allocated */
125
126 /* Check whether it's okay to allocate more memory for a transfer */
127 static int usbfs_increase_memory_usage(unsigned amount)
128 {
129 unsigned lim;
130
131 /*
132 * Convert usbfs_memory_mb to bytes, avoiding overflows.
133 * 0 means use the hard limit (effectively unlimited).
134 */
135 lim = ACCESS_ONCE(usbfs_memory_mb);
136 if (lim == 0 || lim > (USBFS_XFER_MAX >> 20))
137 lim = USBFS_XFER_MAX;
138 else
139 lim <<= 20;
140
141 atomic_add(amount, &usbfs_memory_usage);
142 if (atomic_read(&usbfs_memory_usage) <= lim)
143 return 0;
144 atomic_sub(amount, &usbfs_memory_usage);
145 return -ENOMEM;
146 }
147
148 /* Memory for a transfer is being deallocated */
149 static void usbfs_decrease_memory_usage(unsigned amount)
150 {
151 atomic_sub(amount, &usbfs_memory_usage);
152 }
153
154 static int connected(struct dev_state *ps)
155 {
156 return (!list_empty(&ps->list) &&
157 ps->dev->state != USB_STATE_NOTATTACHED);
158 }
159
160 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
161 {
162 loff_t ret;
163
164 mutex_lock(&file_inode(file)->i_mutex);
165
166 switch (orig) {
167 case 0:
168 file->f_pos = offset;
169 ret = file->f_pos;
170 break;
171 case 1:
172 file->f_pos += offset;
173 ret = file->f_pos;
174 break;
175 case 2:
176 default:
177 ret = -EINVAL;
178 }
179
180 mutex_unlock(&file_inode(file)->i_mutex);
181 return ret;
182 }
183
184 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
185 loff_t *ppos)
186 {
187 struct dev_state *ps = file->private_data;
188 struct usb_device *dev = ps->dev;
189 ssize_t ret = 0;
190 unsigned len;
191 loff_t pos;
192 int i;
193
194 pos = *ppos;
195 usb_lock_device(dev);
196 if (!connected(ps)) {
197 ret = -ENODEV;
198 goto err;
199 } else if (pos < 0) {
200 ret = -EINVAL;
201 goto err;
202 }
203
204 if (pos < sizeof(struct usb_device_descriptor)) {
205 /* 18 bytes - fits on the stack */
206 struct usb_device_descriptor temp_desc;
207
208 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
209 le16_to_cpus(&temp_desc.bcdUSB);
210 le16_to_cpus(&temp_desc.idVendor);
211 le16_to_cpus(&temp_desc.idProduct);
212 le16_to_cpus(&temp_desc.bcdDevice);
213
214 len = sizeof(struct usb_device_descriptor) - pos;
215 if (len > nbytes)
216 len = nbytes;
217 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
218 ret = -EFAULT;
219 goto err;
220 }
221
222 *ppos += len;
223 buf += len;
224 nbytes -= len;
225 ret += len;
226 }
227
228 pos = sizeof(struct usb_device_descriptor);
229 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
230 struct usb_config_descriptor *config =
231 (struct usb_config_descriptor *)dev->rawdescriptors[i];
232 unsigned int length = le16_to_cpu(config->wTotalLength);
233
234 if (*ppos < pos + length) {
235
236 /* The descriptor may claim to be longer than it
237 * really is. Here is the actual allocated length. */
238 unsigned alloclen =
239 le16_to_cpu(dev->config[i].desc.wTotalLength);
240
241 len = length - (*ppos - pos);
242 if (len > nbytes)
243 len = nbytes;
244
245 /* Simply don't write (skip over) unallocated parts */
246 if (alloclen > (*ppos - pos)) {
247 alloclen -= (*ppos - pos);
248 if (copy_to_user(buf,
249 dev->rawdescriptors[i] + (*ppos - pos),
250 min(len, alloclen))) {
251 ret = -EFAULT;
252 goto err;
253 }
254 }
255
256 *ppos += len;
257 buf += len;
258 nbytes -= len;
259 ret += len;
260 }
261
262 pos += length;
263 }
264
265 err:
266 usb_unlock_device(dev);
267 return ret;
268 }
269
270 /*
271 * async list handling
272 */
273
274 static struct async *alloc_async(unsigned int numisoframes)
275 {
276 struct async *as;
277
278 as = kzalloc(sizeof(struct async), GFP_KERNEL);
279 if (!as)
280 return NULL;
281 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
282 if (!as->urb) {
283 kfree(as);
284 return NULL;
285 }
286 return as;
287 }
288
289 static void free_async(struct async *as)
290 {
291 int i;
292
293 put_pid(as->pid);
294 if (as->cred)
295 put_cred(as->cred);
296 for (i = 0; i < as->urb->num_sgs; i++) {
297 if (sg_page(&as->urb->sg[i]))
298 kfree(sg_virt(&as->urb->sg[i]));
299 }
300 kfree(as->urb->sg);
301 kfree(as->urb->transfer_buffer);
302 kfree(as->urb->setup_packet);
303 usb_free_urb(as->urb);
304 usbfs_decrease_memory_usage(as->mem_usage);
305 kfree(as);
306 }
307
308 static void async_newpending(struct async *as)
309 {
310 struct dev_state *ps = as->ps;
311 unsigned long flags;
312
313 spin_lock_irqsave(&ps->lock, flags);
314 list_add_tail(&as->asynclist, &ps->async_pending);
315 spin_unlock_irqrestore(&ps->lock, flags);
316 }
317
318 static void async_removepending(struct async *as)
319 {
320 struct dev_state *ps = as->ps;
321 unsigned long flags;
322
323 spin_lock_irqsave(&ps->lock, flags);
324 list_del_init(&as->asynclist);
325 spin_unlock_irqrestore(&ps->lock, flags);
326 }
327
328 static struct async *async_getcompleted(struct dev_state *ps)
329 {
330 unsigned long flags;
331 struct async *as = NULL;
332
333 spin_lock_irqsave(&ps->lock, flags);
334 if (!list_empty(&ps->async_completed)) {
335 as = list_entry(ps->async_completed.next, struct async,
336 asynclist);
337 list_del_init(&as->asynclist);
338 }
339 spin_unlock_irqrestore(&ps->lock, flags);
340 return as;
341 }
342
343 static struct async *async_getpending(struct dev_state *ps,
344 void __user *userurb)
345 {
346 struct async *as;
347
348 list_for_each_entry(as, &ps->async_pending, asynclist)
349 if (as->userurb == userurb) {
350 list_del_init(&as->asynclist);
351 return as;
352 }
353
354 return NULL;
355 }
356
357 static void snoop_urb(struct usb_device *udev,
358 void __user *userurb, int pipe, unsigned length,
359 int timeout_or_status, enum snoop_when when,
360 unsigned char *data, unsigned data_len)
361 {
362 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
363 static const char *dirs[] = {"out", "in"};
364 int ep;
365 const char *t, *d;
366
367 if (!usbfs_snoop)
368 return;
369
370 ep = usb_pipeendpoint(pipe);
371 t = types[usb_pipetype(pipe)];
372 d = dirs[!!usb_pipein(pipe)];
373
374 if (userurb) { /* Async */
375 if (when == SUBMIT)
376 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
377 "length %u\n",
378 userurb, ep, t, d, length);
379 else
380 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
381 "actual_length %u status %d\n",
382 userurb, ep, t, d, length,
383 timeout_or_status);
384 } else {
385 if (when == SUBMIT)
386 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
387 "timeout %d\n",
388 ep, t, d, length, timeout_or_status);
389 else
390 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
391 "status %d\n",
392 ep, t, d, length, timeout_or_status);
393 }
394
395 if (data && data_len > 0) {
396 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
397 data, data_len, 1);
398 }
399 }
400
401 static void snoop_urb_data(struct urb *urb, unsigned len)
402 {
403 int i, size;
404
405 if (!usbfs_snoop)
406 return;
407
408 if (urb->num_sgs == 0) {
409 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
410 urb->transfer_buffer, len, 1);
411 return;
412 }
413
414 for (i = 0; i < urb->num_sgs && len; i++) {
415 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
416 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
417 sg_virt(&urb->sg[i]), size, 1);
418 len -= size;
419 }
420 }
421
422 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
423 {
424 unsigned i, len, size;
425
426 if (urb->number_of_packets > 0) /* Isochronous */
427 len = urb->transfer_buffer_length;
428 else /* Non-Isoc */
429 len = urb->actual_length;
430
431 if (urb->num_sgs == 0) {
432 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
433 return -EFAULT;
434 return 0;
435 }
436
437 for (i = 0; i < urb->num_sgs && len; i++) {
438 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
439 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
440 return -EFAULT;
441 userbuffer += size;
442 len -= size;
443 }
444
445 return 0;
446 }
447
448 #define AS_CONTINUATION 1
449 #define AS_UNLINK 2
450
451 static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr)
452 __releases(ps->lock)
453 __acquires(ps->lock)
454 {
455 struct urb *urb;
456 struct async *as;
457
458 /* Mark all the pending URBs that match bulk_addr, up to but not
459 * including the first one without AS_CONTINUATION. If such an
460 * URB is encountered then a new transfer has already started so
461 * the endpoint doesn't need to be disabled; otherwise it does.
462 */
463 list_for_each_entry(as, &ps->async_pending, asynclist) {
464 if (as->bulk_addr == bulk_addr) {
465 if (as->bulk_status != AS_CONTINUATION)
466 goto rescan;
467 as->bulk_status = AS_UNLINK;
468 as->bulk_addr = 0;
469 }
470 }
471 ps->disabled_bulk_eps |= (1 << bulk_addr);
472
473 /* Now carefully unlink all the marked pending URBs */
474 rescan:
475 list_for_each_entry(as, &ps->async_pending, asynclist) {
476 if (as->bulk_status == AS_UNLINK) {
477 as->bulk_status = 0; /* Only once */
478 urb = as->urb;
479 usb_get_urb(urb);
480 spin_unlock(&ps->lock); /* Allow completions */
481 usb_unlink_urb(urb);
482 usb_put_urb(urb);
483 spin_lock(&ps->lock);
484 goto rescan;
485 }
486 }
487 }
488
489 static void async_completed(struct urb *urb)
490 {
491 struct async *as = urb->context;
492 struct dev_state *ps = as->ps;
493 struct siginfo sinfo;
494 struct pid *pid = NULL;
495 u32 secid = 0;
496 const struct cred *cred = NULL;
497 int signr;
498
499 spin_lock(&ps->lock);
500 list_move_tail(&as->asynclist, &ps->async_completed);
501 as->status = urb->status;
502 signr = as->signr;
503 if (signr) {
504 sinfo.si_signo = as->signr;
505 sinfo.si_errno = as->status;
506 sinfo.si_code = SI_ASYNCIO;
507 sinfo.si_addr = as->userurb;
508 pid = get_pid(as->pid);
509 cred = get_cred(as->cred);
510 secid = as->secid;
511 }
512 snoop(&urb->dev->dev, "urb complete\n");
513 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
514 as->status, COMPLETE, NULL, 0);
515 if ((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_IN)
516 snoop_urb_data(urb, urb->actual_length);
517
518 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
519 as->status != -ENOENT)
520 cancel_bulk_urbs(ps, as->bulk_addr);
521 spin_unlock(&ps->lock);
522
523 if (signr) {
524 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
525 put_pid(pid);
526 put_cred(cred);
527 }
528
529 wake_up(&ps->wait);
530 }
531
532 static void destroy_async(struct dev_state *ps, struct list_head *list)
533 {
534 struct urb *urb;
535 struct async *as;
536 unsigned long flags;
537
538 spin_lock_irqsave(&ps->lock, flags);
539 while (!list_empty(list)) {
540 as = list_entry(list->next, struct async, asynclist);
541 list_del_init(&as->asynclist);
542 urb = as->urb;
543 usb_get_urb(urb);
544
545 /* drop the spinlock so the completion handler can run */
546 spin_unlock_irqrestore(&ps->lock, flags);
547 usb_kill_urb(urb);
548 usb_put_urb(urb);
549 spin_lock_irqsave(&ps->lock, flags);
550 }
551 spin_unlock_irqrestore(&ps->lock, flags);
552 }
553
554 static void destroy_async_on_interface(struct dev_state *ps,
555 unsigned int ifnum)
556 {
557 struct list_head *p, *q, hitlist;
558 unsigned long flags;
559
560 INIT_LIST_HEAD(&hitlist);
561 spin_lock_irqsave(&ps->lock, flags);
562 list_for_each_safe(p, q, &ps->async_pending)
563 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
564 list_move_tail(p, &hitlist);
565 spin_unlock_irqrestore(&ps->lock, flags);
566 destroy_async(ps, &hitlist);
567 }
568
569 static void destroy_all_async(struct dev_state *ps)
570 {
571 destroy_async(ps, &ps->async_pending);
572 }
573
574 /*
575 * interface claims are made only at the request of user level code,
576 * which can also release them (explicitly or by closing files).
577 * they're also undone when devices disconnect.
578 */
579
580 static int driver_probe(struct usb_interface *intf,
581 const struct usb_device_id *id)
582 {
583 return -ENODEV;
584 }
585
586 static void driver_disconnect(struct usb_interface *intf)
587 {
588 struct dev_state *ps = usb_get_intfdata(intf);
589 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
590
591 if (!ps)
592 return;
593
594 /* NOTE: this relies on usbcore having canceled and completed
595 * all pending I/O requests; 2.6 does that.
596 */
597
598 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
599 clear_bit(ifnum, &ps->ifclaimed);
600 else
601 dev_warn(&intf->dev, "interface number %u out of range\n",
602 ifnum);
603
604 usb_set_intfdata(intf, NULL);
605
606 /* force async requests to complete */
607 destroy_async_on_interface(ps, ifnum);
608 }
609
610 /* The following routines are merely placeholders. There is no way
611 * to inform a user task about suspend or resumes.
612 */
613 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
614 {
615 return 0;
616 }
617
618 static int driver_resume(struct usb_interface *intf)
619 {
620 return 0;
621 }
622
623 struct usb_driver usbfs_driver = {
624 .name = "usbfs",
625 .probe = driver_probe,
626 .disconnect = driver_disconnect,
627 .suspend = driver_suspend,
628 .resume = driver_resume,
629 };
630
631 static int claimintf(struct dev_state *ps, unsigned int ifnum)
632 {
633 struct usb_device *dev = ps->dev;
634 struct usb_interface *intf;
635 int err;
636
637 if (ifnum >= 8*sizeof(ps->ifclaimed))
638 return -EINVAL;
639 /* already claimed */
640 if (test_bit(ifnum, &ps->ifclaimed))
641 return 0;
642
643 intf = usb_ifnum_to_if(dev, ifnum);
644 if (!intf)
645 err = -ENOENT;
646 else
647 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
648 if (err == 0)
649 set_bit(ifnum, &ps->ifclaimed);
650 return err;
651 }
652
653 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
654 {
655 struct usb_device *dev;
656 struct usb_interface *intf;
657 int err;
658
659 err = -EINVAL;
660 if (ifnum >= 8*sizeof(ps->ifclaimed))
661 return err;
662 dev = ps->dev;
663 intf = usb_ifnum_to_if(dev, ifnum);
664 if (!intf)
665 err = -ENOENT;
666 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
667 usb_driver_release_interface(&usbfs_driver, intf);
668 err = 0;
669 }
670 return err;
671 }
672
673 static int checkintf(struct dev_state *ps, unsigned int ifnum)
674 {
675 if (ps->dev->state != USB_STATE_CONFIGURED)
676 return -EHOSTUNREACH;
677 if (ifnum >= 8*sizeof(ps->ifclaimed))
678 return -EINVAL;
679 if (test_bit(ifnum, &ps->ifclaimed))
680 return 0;
681 /* if not yet claimed, claim it for the driver */
682 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
683 "interface %u before use\n", task_pid_nr(current),
684 current->comm, ifnum);
685 return claimintf(ps, ifnum);
686 }
687
688 static int findintfep(struct usb_device *dev, unsigned int ep)
689 {
690 unsigned int i, j, e;
691 struct usb_interface *intf;
692 struct usb_host_interface *alts;
693 struct usb_endpoint_descriptor *endpt;
694
695 if (ep & ~(USB_DIR_IN|0xf))
696 return -EINVAL;
697 if (!dev->actconfig)
698 return -ESRCH;
699 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
700 intf = dev->actconfig->interface[i];
701 for (j = 0; j < intf->num_altsetting; j++) {
702 alts = &intf->altsetting[j];
703 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
704 endpt = &alts->endpoint[e].desc;
705 if (endpt->bEndpointAddress == ep)
706 return alts->desc.bInterfaceNumber;
707 }
708 }
709 }
710 return -ENOENT;
711 }
712
713 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
714 unsigned int request, unsigned int index)
715 {
716 int ret = 0;
717 struct usb_host_interface *alt_setting;
718
719 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
720 && ps->dev->state != USB_STATE_ADDRESS
721 && ps->dev->state != USB_STATE_CONFIGURED)
722 return -EHOSTUNREACH;
723 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
724 return 0;
725
726 /*
727 * check for the special corner case 'get_device_id' in the printer
728 * class specification, which we always want to allow as it is used
729 * to query things like ink level, etc.
730 */
731 if (requesttype == 0xa1 && request == 0) {
732 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
733 index >> 8, index & 0xff);
734 if (alt_setting
735 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
736 return 0;
737 }
738
739 index &= 0xff;
740 switch (requesttype & USB_RECIP_MASK) {
741 case USB_RECIP_ENDPOINT:
742 if ((index & ~USB_DIR_IN) == 0)
743 return 0;
744 ret = findintfep(ps->dev, index);
745 if (ret < 0) {
746 /*
747 * Some not fully compliant Win apps seem to get
748 * index wrong and have the endpoint number here
749 * rather than the endpoint address (with the
750 * correct direction). Win does let this through,
751 * so we'll not reject it here but leave it to
752 * the device to not break KVM. But we warn.
753 */
754 ret = findintfep(ps->dev, index ^ 0x80);
755 if (ret >= 0)
756 dev_info(&ps->dev->dev,
757 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
758 __func__, task_pid_nr(current),
759 current->comm, index, index ^ 0x80);
760 }
761 if (ret >= 0)
762 ret = checkintf(ps, ret);
763 break;
764
765 case USB_RECIP_INTERFACE:
766 ret = checkintf(ps, index);
767 break;
768 }
769 return ret;
770 }
771
772 static int match_devt(struct device *dev, void *data)
773 {
774 return dev->devt == (dev_t) (unsigned long) data;
775 }
776
777 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
778 {
779 struct device *dev;
780
781 dev = bus_find_device(&usb_bus_type, NULL,
782 (void *) (unsigned long) devt, match_devt);
783 if (!dev)
784 return NULL;
785 return container_of(dev, struct usb_device, dev);
786 }
787
788 /*
789 * file operations
790 */
791 static int usbdev_open(struct inode *inode, struct file *file)
792 {
793 struct usb_device *dev = NULL;
794 struct dev_state *ps;
795 int ret;
796
797 ret = -ENOMEM;
798 ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
799 if (!ps)
800 goto out_free_ps;
801
802 ret = -ENODEV;
803
804 /* Protect against simultaneous removal or release */
805 mutex_lock(&usbfs_mutex);
806
807 /* usbdev device-node */
808 if (imajor(inode) == USB_DEVICE_MAJOR)
809 dev = usbdev_lookup_by_devt(inode->i_rdev);
810
811 mutex_unlock(&usbfs_mutex);
812
813 if (!dev)
814 goto out_free_ps;
815
816 usb_lock_device(dev);
817 if (dev->state == USB_STATE_NOTATTACHED)
818 goto out_unlock_device;
819
820 ret = usb_autoresume_device(dev);
821 if (ret)
822 goto out_unlock_device;
823
824 ps->dev = dev;
825 ps->file = file;
826 spin_lock_init(&ps->lock);
827 INIT_LIST_HEAD(&ps->list);
828 INIT_LIST_HEAD(&ps->async_pending);
829 INIT_LIST_HEAD(&ps->async_completed);
830 init_waitqueue_head(&ps->wait);
831 ps->discsignr = 0;
832 ps->disc_pid = get_pid(task_pid(current));
833 ps->cred = get_current_cred();
834 ps->disccontext = NULL;
835 ps->ifclaimed = 0;
836 security_task_getsecid(current, &ps->secid);
837 smp_wmb();
838 list_add_tail(&ps->list, &dev->filelist);
839 file->private_data = ps;
840 usb_unlock_device(dev);
841 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
842 current->comm);
843 return ret;
844
845 out_unlock_device:
846 usb_unlock_device(dev);
847 usb_put_dev(dev);
848 out_free_ps:
849 kfree(ps);
850 return ret;
851 }
852
853 static int usbdev_release(struct inode *inode, struct file *file)
854 {
855 struct dev_state *ps = file->private_data;
856 struct usb_device *dev = ps->dev;
857 unsigned int ifnum;
858 struct async *as;
859
860 usb_lock_device(dev);
861 usb_hub_release_all_ports(dev, ps);
862
863 list_del_init(&ps->list);
864
865 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
866 ifnum++) {
867 if (test_bit(ifnum, &ps->ifclaimed))
868 releaseintf(ps, ifnum);
869 }
870 destroy_all_async(ps);
871 usb_autosuspend_device(dev);
872 usb_unlock_device(dev);
873 usb_put_dev(dev);
874 put_pid(ps->disc_pid);
875 put_cred(ps->cred);
876
877 as = async_getcompleted(ps);
878 while (as) {
879 free_async(as);
880 as = async_getcompleted(ps);
881 }
882 kfree(ps);
883 return 0;
884 }
885
886 static int proc_control(struct dev_state *ps, void __user *arg)
887 {
888 struct usb_device *dev = ps->dev;
889 struct usbdevfs_ctrltransfer ctrl;
890 unsigned int tmo;
891 unsigned char *tbuf;
892 unsigned wLength;
893 int i, pipe, ret;
894
895 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
896 return -EFAULT;
897 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
898 ctrl.wIndex);
899 if (ret)
900 return ret;
901 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
902 if (wLength > PAGE_SIZE)
903 return -EINVAL;
904 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
905 sizeof(struct usb_ctrlrequest));
906 if (ret)
907 return ret;
908 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
909 if (!tbuf) {
910 ret = -ENOMEM;
911 goto done;
912 }
913 tmo = ctrl.timeout;
914 snoop(&dev->dev, "control urb: bRequestType=%02x "
915 "bRequest=%02x wValue=%04x "
916 "wIndex=%04x wLength=%04x\n",
917 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
918 ctrl.wIndex, ctrl.wLength);
919 if (ctrl.bRequestType & 0x80) {
920 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
921 ctrl.wLength)) {
922 ret = -EINVAL;
923 goto done;
924 }
925 pipe = usb_rcvctrlpipe(dev, 0);
926 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
927
928 usb_unlock_device(dev);
929 i = usb_control_msg(dev, pipe, ctrl.bRequest,
930 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
931 tbuf, ctrl.wLength, tmo);
932 usb_lock_device(dev);
933 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
934 tbuf, max(i, 0));
935 if ((i > 0) && ctrl.wLength) {
936 if (copy_to_user(ctrl.data, tbuf, i)) {
937 ret = -EFAULT;
938 goto done;
939 }
940 }
941 } else {
942 if (ctrl.wLength) {
943 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
944 ret = -EFAULT;
945 goto done;
946 }
947 }
948 pipe = usb_sndctrlpipe(dev, 0);
949 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
950 tbuf, ctrl.wLength);
951
952 usb_unlock_device(dev);
953 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
954 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
955 tbuf, ctrl.wLength, tmo);
956 usb_lock_device(dev);
957 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
958 }
959 if (i < 0 && i != -EPIPE) {
960 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
961 "failed cmd %s rqt %u rq %u len %u ret %d\n",
962 current->comm, ctrl.bRequestType, ctrl.bRequest,
963 ctrl.wLength, i);
964 }
965 ret = i;
966 done:
967 free_page((unsigned long) tbuf);
968 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
969 sizeof(struct usb_ctrlrequest));
970 return ret;
971 }
972
973 static int proc_bulk(struct dev_state *ps, void __user *arg)
974 {
975 struct usb_device *dev = ps->dev;
976 struct usbdevfs_bulktransfer bulk;
977 unsigned int tmo, len1, pipe;
978 int len2;
979 unsigned char *tbuf;
980 int i, ret;
981
982 if (copy_from_user(&bulk, arg, sizeof(bulk)))
983 return -EFAULT;
984 ret = findintfep(ps->dev, bulk.ep);
985 if (ret < 0)
986 return ret;
987 ret = checkintf(ps, ret);
988 if (ret)
989 return ret;
990 if (bulk.ep & USB_DIR_IN)
991 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
992 else
993 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
994 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
995 return -EINVAL;
996 len1 = bulk.len;
997 if (len1 >= USBFS_XFER_MAX)
998 return -EINVAL;
999 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1000 if (ret)
1001 return ret;
1002 if (!(tbuf = kmalloc(len1, GFP_KERNEL))) {
1003 ret = -ENOMEM;
1004 goto done;
1005 }
1006 tmo = bulk.timeout;
1007 if (bulk.ep & 0x80) {
1008 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1009 ret = -EINVAL;
1010 goto done;
1011 }
1012 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1013
1014 usb_unlock_device(dev);
1015 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1016 usb_lock_device(dev);
1017 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1018
1019 if (!i && len2) {
1020 if (copy_to_user(bulk.data, tbuf, len2)) {
1021 ret = -EFAULT;
1022 goto done;
1023 }
1024 }
1025 } else {
1026 if (len1) {
1027 if (copy_from_user(tbuf, bulk.data, len1)) {
1028 ret = -EFAULT;
1029 goto done;
1030 }
1031 }
1032 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1033
1034 usb_unlock_device(dev);
1035 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1036 usb_lock_device(dev);
1037 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1038 }
1039 ret = (i < 0 ? i : len2);
1040 done:
1041 kfree(tbuf);
1042 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1043 return ret;
1044 }
1045
1046 static int proc_resetep(struct dev_state *ps, void __user *arg)
1047 {
1048 unsigned int ep;
1049 int ret;
1050
1051 if (get_user(ep, (unsigned int __user *)arg))
1052 return -EFAULT;
1053 ret = findintfep(ps->dev, ep);
1054 if (ret < 0)
1055 return ret;
1056 ret = checkintf(ps, ret);
1057 if (ret)
1058 return ret;
1059 usb_reset_endpoint(ps->dev, ep);
1060 return 0;
1061 }
1062
1063 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
1064 {
1065 unsigned int ep;
1066 int pipe;
1067 int ret;
1068
1069 if (get_user(ep, (unsigned int __user *)arg))
1070 return -EFAULT;
1071 ret = findintfep(ps->dev, ep);
1072 if (ret < 0)
1073 return ret;
1074 ret = checkintf(ps, ret);
1075 if (ret)
1076 return ret;
1077 if (ep & USB_DIR_IN)
1078 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1079 else
1080 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1081
1082 return usb_clear_halt(ps->dev, pipe);
1083 }
1084
1085 static int proc_getdriver(struct dev_state *ps, void __user *arg)
1086 {
1087 struct usbdevfs_getdriver gd;
1088 struct usb_interface *intf;
1089 int ret;
1090
1091 if (copy_from_user(&gd, arg, sizeof(gd)))
1092 return -EFAULT;
1093 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1094 if (!intf || !intf->dev.driver)
1095 ret = -ENODATA;
1096 else {
1097 strlcpy(gd.driver, intf->dev.driver->name,
1098 sizeof(gd.driver));
1099 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1100 }
1101 return ret;
1102 }
1103
1104 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
1105 {
1106 struct usbdevfs_connectinfo ci = {
1107 .devnum = ps->dev->devnum,
1108 .slow = ps->dev->speed == USB_SPEED_LOW
1109 };
1110
1111 if (copy_to_user(arg, &ci, sizeof(ci)))
1112 return -EFAULT;
1113 return 0;
1114 }
1115
1116 static int proc_resetdevice(struct dev_state *ps)
1117 {
1118 return usb_reset_device(ps->dev);
1119 }
1120
1121 static int proc_setintf(struct dev_state *ps, void __user *arg)
1122 {
1123 struct usbdevfs_setinterface setintf;
1124 int ret;
1125
1126 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1127 return -EFAULT;
1128 if ((ret = checkintf(ps, setintf.interface)))
1129 return ret;
1130 return usb_set_interface(ps->dev, setintf.interface,
1131 setintf.altsetting);
1132 }
1133
1134 static int proc_setconfig(struct dev_state *ps, void __user *arg)
1135 {
1136 int u;
1137 int status = 0;
1138 struct usb_host_config *actconfig;
1139
1140 if (get_user(u, (int __user *)arg))
1141 return -EFAULT;
1142
1143 actconfig = ps->dev->actconfig;
1144
1145 /* Don't touch the device if any interfaces are claimed.
1146 * It could interfere with other drivers' operations, and if
1147 * an interface is claimed by usbfs it could easily deadlock.
1148 */
1149 if (actconfig) {
1150 int i;
1151
1152 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1153 if (usb_interface_claimed(actconfig->interface[i])) {
1154 dev_warn(&ps->dev->dev,
1155 "usbfs: interface %d claimed by %s "
1156 "while '%s' sets config #%d\n",
1157 actconfig->interface[i]
1158 ->cur_altsetting
1159 ->desc.bInterfaceNumber,
1160 actconfig->interface[i]
1161 ->dev.driver->name,
1162 current->comm, u);
1163 status = -EBUSY;
1164 break;
1165 }
1166 }
1167 }
1168
1169 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1170 * so avoid usb_set_configuration()'s kick to sysfs
1171 */
1172 if (status == 0) {
1173 if (actconfig && actconfig->desc.bConfigurationValue == u)
1174 status = usb_reset_configuration(ps->dev);
1175 else
1176 status = usb_set_configuration(ps->dev, u);
1177 }
1178
1179 return status;
1180 }
1181
1182 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1183 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1184 void __user *arg)
1185 {
1186 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1187 struct usb_host_endpoint *ep;
1188 struct async *as = NULL;
1189 struct usb_ctrlrequest *dr = NULL;
1190 unsigned int u, totlen, isofrmlen;
1191 int i, ret, is_in, num_sgs = 0, ifnum = -1;
1192 void *buf;
1193
1194 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1195 USBDEVFS_URB_SHORT_NOT_OK |
1196 USBDEVFS_URB_BULK_CONTINUATION |
1197 USBDEVFS_URB_NO_FSBR |
1198 USBDEVFS_URB_ZERO_PACKET |
1199 USBDEVFS_URB_NO_INTERRUPT))
1200 return -EINVAL;
1201 if (uurb->buffer_length > 0 && !uurb->buffer)
1202 return -EINVAL;
1203 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1204 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1205 ifnum = findintfep(ps->dev, uurb->endpoint);
1206 if (ifnum < 0)
1207 return ifnum;
1208 ret = checkintf(ps, ifnum);
1209 if (ret)
1210 return ret;
1211 }
1212 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1213 is_in = 1;
1214 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1215 } else {
1216 is_in = 0;
1217 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1218 }
1219 if (!ep)
1220 return -ENOENT;
1221
1222 u = 0;
1223 switch(uurb->type) {
1224 case USBDEVFS_URB_TYPE_CONTROL:
1225 if (!usb_endpoint_xfer_control(&ep->desc))
1226 return -EINVAL;
1227 /* min 8 byte setup packet */
1228 if (uurb->buffer_length < 8)
1229 return -EINVAL;
1230 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1231 if (!dr)
1232 return -ENOMEM;
1233 if (copy_from_user(dr, uurb->buffer, 8)) {
1234 ret = -EFAULT;
1235 goto error;
1236 }
1237 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1238 ret = -EINVAL;
1239 goto error;
1240 }
1241 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1242 le16_to_cpup(&dr->wIndex));
1243 if (ret)
1244 goto error;
1245 uurb->number_of_packets = 0;
1246 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1247 uurb->buffer += 8;
1248 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1249 is_in = 1;
1250 uurb->endpoint |= USB_DIR_IN;
1251 } else {
1252 is_in = 0;
1253 uurb->endpoint &= ~USB_DIR_IN;
1254 }
1255 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1256 "bRequest=%02x wValue=%04x "
1257 "wIndex=%04x wLength=%04x\n",
1258 dr->bRequestType, dr->bRequest,
1259 __le16_to_cpup(&dr->wValue),
1260 __le16_to_cpup(&dr->wIndex),
1261 __le16_to_cpup(&dr->wLength));
1262 u = sizeof(struct usb_ctrlrequest);
1263 break;
1264
1265 case USBDEVFS_URB_TYPE_BULK:
1266 switch (usb_endpoint_type(&ep->desc)) {
1267 case USB_ENDPOINT_XFER_CONTROL:
1268 case USB_ENDPOINT_XFER_ISOC:
1269 return -EINVAL;
1270 case USB_ENDPOINT_XFER_INT:
1271 /* allow single-shot interrupt transfers */
1272 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1273 goto interrupt_urb;
1274 }
1275 uurb->number_of_packets = 0;
1276 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1277 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1278 num_sgs = 0;
1279 break;
1280
1281 case USBDEVFS_URB_TYPE_INTERRUPT:
1282 if (!usb_endpoint_xfer_int(&ep->desc))
1283 return -EINVAL;
1284 interrupt_urb:
1285 uurb->number_of_packets = 0;
1286 break;
1287
1288 case USBDEVFS_URB_TYPE_ISO:
1289 /* arbitrary limit */
1290 if (uurb->number_of_packets < 1 ||
1291 uurb->number_of_packets > 128)
1292 return -EINVAL;
1293 if (!usb_endpoint_xfer_isoc(&ep->desc))
1294 return -EINVAL;
1295 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1296 uurb->number_of_packets;
1297 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1298 return -ENOMEM;
1299 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1300 ret = -EFAULT;
1301 goto error;
1302 }
1303 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1304 /*
1305 * arbitrary limit need for USB 3.0
1306 * bMaxBurst (0~15 allowed, 1~16 packets)
1307 * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1308 * sizemax: 1024 * 16 * 3 = 49152
1309 */
1310 if (isopkt[u].length > 49152) {
1311 ret = -EINVAL;
1312 goto error;
1313 }
1314 totlen += isopkt[u].length;
1315 }
1316 u *= sizeof(struct usb_iso_packet_descriptor);
1317 uurb->buffer_length = totlen;
1318 break;
1319
1320 default:
1321 return -EINVAL;
1322 }
1323
1324 if (uurb->buffer_length >= USBFS_XFER_MAX) {
1325 ret = -EINVAL;
1326 goto error;
1327 }
1328 if (uurb->buffer_length > 0 &&
1329 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1330 uurb->buffer, uurb->buffer_length)) {
1331 ret = -EFAULT;
1332 goto error;
1333 }
1334 as = alloc_async(uurb->number_of_packets);
1335 if (!as) {
1336 ret = -ENOMEM;
1337 goto error;
1338 }
1339
1340 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1341 num_sgs * sizeof(struct scatterlist);
1342 ret = usbfs_increase_memory_usage(u);
1343 if (ret)
1344 goto error;
1345 as->mem_usage = u;
1346
1347 if (num_sgs) {
1348 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1349 GFP_KERNEL);
1350 if (!as->urb->sg) {
1351 ret = -ENOMEM;
1352 goto error;
1353 }
1354 as->urb->num_sgs = num_sgs;
1355 sg_init_table(as->urb->sg, as->urb->num_sgs);
1356
1357 totlen = uurb->buffer_length;
1358 for (i = 0; i < as->urb->num_sgs; i++) {
1359 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1360 buf = kmalloc(u, GFP_KERNEL);
1361 if (!buf) {
1362 ret = -ENOMEM;
1363 goto error;
1364 }
1365 sg_set_buf(&as->urb->sg[i], buf, u);
1366
1367 if (!is_in) {
1368 if (copy_from_user(buf, uurb->buffer, u)) {
1369 ret = -EFAULT;
1370 goto error;
1371 }
1372 uurb->buffer += u;
1373 }
1374 totlen -= u;
1375 }
1376 } else if (uurb->buffer_length > 0) {
1377 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1378 GFP_KERNEL);
1379 if (!as->urb->transfer_buffer) {
1380 ret = -ENOMEM;
1381 goto error;
1382 }
1383
1384 if (!is_in) {
1385 if (copy_from_user(as->urb->transfer_buffer,
1386 uurb->buffer,
1387 uurb->buffer_length)) {
1388 ret = -EFAULT;
1389 goto error;
1390 }
1391 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1392 /*
1393 * Isochronous input data may end up being
1394 * discontiguous if some of the packets are short.
1395 * Clear the buffer so that the gaps don't leak
1396 * kernel data to userspace.
1397 */
1398 memset(as->urb->transfer_buffer, 0,
1399 uurb->buffer_length);
1400 }
1401 }
1402 as->urb->dev = ps->dev;
1403 as->urb->pipe = (uurb->type << 30) |
1404 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1405 (uurb->endpoint & USB_DIR_IN);
1406
1407 /* This tedious sequence is necessary because the URB_* flags
1408 * are internal to the kernel and subject to change, whereas
1409 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1410 */
1411 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1412 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1413 u |= URB_ISO_ASAP;
1414 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1415 u |= URB_SHORT_NOT_OK;
1416 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1417 u |= URB_NO_FSBR;
1418 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1419 u |= URB_ZERO_PACKET;
1420 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1421 u |= URB_NO_INTERRUPT;
1422 as->urb->transfer_flags = u;
1423
1424 as->urb->transfer_buffer_length = uurb->buffer_length;
1425 as->urb->setup_packet = (unsigned char *)dr;
1426 dr = NULL;
1427 as->urb->start_frame = uurb->start_frame;
1428 as->urb->number_of_packets = uurb->number_of_packets;
1429 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1430 ps->dev->speed == USB_SPEED_HIGH)
1431 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1432 else
1433 as->urb->interval = ep->desc.bInterval;
1434 as->urb->context = as;
1435 as->urb->complete = async_completed;
1436 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1437 as->urb->iso_frame_desc[u].offset = totlen;
1438 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1439 totlen += isopkt[u].length;
1440 }
1441 kfree(isopkt);
1442 isopkt = NULL;
1443 as->ps = ps;
1444 as->userurb = arg;
1445 if (is_in && uurb->buffer_length > 0)
1446 as->userbuffer = uurb->buffer;
1447 else
1448 as->userbuffer = NULL;
1449 as->signr = uurb->signr;
1450 as->ifnum = ifnum;
1451 as->pid = get_pid(task_pid(current));
1452 as->cred = get_current_cred();
1453 security_task_getsecid(current, &as->secid);
1454 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1455 as->urb->transfer_buffer_length, 0, SUBMIT,
1456 NULL, 0);
1457 if (!is_in)
1458 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1459
1460 async_newpending(as);
1461
1462 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1463 spin_lock_irq(&ps->lock);
1464
1465 /* Not exactly the endpoint address; the direction bit is
1466 * shifted to the 0x10 position so that the value will be
1467 * between 0 and 31.
1468 */
1469 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1470 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1471 >> 3);
1472
1473 /* If this bulk URB is the start of a new transfer, re-enable
1474 * the endpoint. Otherwise mark it as a continuation URB.
1475 */
1476 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1477 as->bulk_status = AS_CONTINUATION;
1478 else
1479 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1480
1481 /* Don't accept continuation URBs if the endpoint is
1482 * disabled because of an earlier error.
1483 */
1484 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1485 ret = -EREMOTEIO;
1486 else
1487 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1488 spin_unlock_irq(&ps->lock);
1489 } else {
1490 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1491 }
1492
1493 if (ret) {
1494 dev_printk(KERN_DEBUG, &ps->dev->dev,
1495 "usbfs: usb_submit_urb returned %d\n", ret);
1496 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1497 0, ret, COMPLETE, NULL, 0);
1498 async_removepending(as);
1499 goto error;
1500 }
1501 return 0;
1502
1503 error:
1504 kfree(isopkt);
1505 kfree(dr);
1506 if (as)
1507 free_async(as);
1508 return ret;
1509 }
1510
1511 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1512 {
1513 struct usbdevfs_urb uurb;
1514
1515 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1516 return -EFAULT;
1517
1518 return proc_do_submiturb(ps, &uurb,
1519 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1520 arg);
1521 }
1522
1523 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1524 {
1525 struct urb *urb;
1526 struct async *as;
1527 unsigned long flags;
1528
1529 spin_lock_irqsave(&ps->lock, flags);
1530 as = async_getpending(ps, arg);
1531 if (!as) {
1532 spin_unlock_irqrestore(&ps->lock, flags);
1533 return -EINVAL;
1534 }
1535
1536 urb = as->urb;
1537 usb_get_urb(urb);
1538 spin_unlock_irqrestore(&ps->lock, flags);
1539
1540 usb_kill_urb(urb);
1541 usb_put_urb(urb);
1542
1543 return 0;
1544 }
1545
1546 static int processcompl(struct async *as, void __user * __user *arg)
1547 {
1548 struct urb *urb = as->urb;
1549 struct usbdevfs_urb __user *userurb = as->userurb;
1550 void __user *addr = as->userurb;
1551 unsigned int i;
1552
1553 if (as->userbuffer && urb->actual_length) {
1554 if (copy_urb_data_to_user(as->userbuffer, urb))
1555 goto err_out;
1556 }
1557 if (put_user(as->status, &userurb->status))
1558 goto err_out;
1559 if (put_user(urb->actual_length, &userurb->actual_length))
1560 goto err_out;
1561 if (put_user(urb->error_count, &userurb->error_count))
1562 goto err_out;
1563
1564 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1565 for (i = 0; i < urb->number_of_packets; i++) {
1566 if (put_user(urb->iso_frame_desc[i].actual_length,
1567 &userurb->iso_frame_desc[i].actual_length))
1568 goto err_out;
1569 if (put_user(urb->iso_frame_desc[i].status,
1570 &userurb->iso_frame_desc[i].status))
1571 goto err_out;
1572 }
1573 }
1574
1575 if (put_user(addr, (void __user * __user *)arg))
1576 return -EFAULT;
1577 return 0;
1578
1579 err_out:
1580 return -EFAULT;
1581 }
1582
1583 static struct async *reap_as(struct dev_state *ps)
1584 {
1585 DECLARE_WAITQUEUE(wait, current);
1586 struct async *as = NULL;
1587 struct usb_device *dev = ps->dev;
1588
1589 add_wait_queue(&ps->wait, &wait);
1590 for (;;) {
1591 __set_current_state(TASK_INTERRUPTIBLE);
1592 as = async_getcompleted(ps);
1593 if (as)
1594 break;
1595 if (signal_pending(current))
1596 break;
1597 usb_unlock_device(dev);
1598 schedule();
1599 usb_lock_device(dev);
1600 }
1601 remove_wait_queue(&ps->wait, &wait);
1602 set_current_state(TASK_RUNNING);
1603 return as;
1604 }
1605
1606 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1607 {
1608 struct async *as = reap_as(ps);
1609 if (as) {
1610 int retval = processcompl(as, (void __user * __user *)arg);
1611 free_async(as);
1612 return retval;
1613 }
1614 if (signal_pending(current))
1615 return -EINTR;
1616 return -EIO;
1617 }
1618
1619 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1620 {
1621 int retval;
1622 struct async *as;
1623
1624 as = async_getcompleted(ps);
1625 retval = -EAGAIN;
1626 if (as) {
1627 retval = processcompl(as, (void __user * __user *)arg);
1628 free_async(as);
1629 }
1630 return retval;
1631 }
1632
1633 #ifdef CONFIG_COMPAT
1634 static int proc_control_compat(struct dev_state *ps,
1635 struct usbdevfs_ctrltransfer32 __user *p32)
1636 {
1637 struct usbdevfs_ctrltransfer __user *p;
1638 __u32 udata;
1639 p = compat_alloc_user_space(sizeof(*p));
1640 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1641 get_user(udata, &p32->data) ||
1642 put_user(compat_ptr(udata), &p->data))
1643 return -EFAULT;
1644 return proc_control(ps, p);
1645 }
1646
1647 static int proc_bulk_compat(struct dev_state *ps,
1648 struct usbdevfs_bulktransfer32 __user *p32)
1649 {
1650 struct usbdevfs_bulktransfer __user *p;
1651 compat_uint_t n;
1652 compat_caddr_t addr;
1653
1654 p = compat_alloc_user_space(sizeof(*p));
1655
1656 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1657 get_user(n, &p32->len) || put_user(n, &p->len) ||
1658 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1659 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1660 return -EFAULT;
1661
1662 return proc_bulk(ps, p);
1663 }
1664 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1665 {
1666 struct usbdevfs_disconnectsignal32 ds;
1667
1668 if (copy_from_user(&ds, arg, sizeof(ds)))
1669 return -EFAULT;
1670 ps->discsignr = ds.signr;
1671 ps->disccontext = compat_ptr(ds.context);
1672 return 0;
1673 }
1674
1675 static int get_urb32(struct usbdevfs_urb *kurb,
1676 struct usbdevfs_urb32 __user *uurb)
1677 {
1678 __u32 uptr;
1679 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1680 __get_user(kurb->type, &uurb->type) ||
1681 __get_user(kurb->endpoint, &uurb->endpoint) ||
1682 __get_user(kurb->status, &uurb->status) ||
1683 __get_user(kurb->flags, &uurb->flags) ||
1684 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1685 __get_user(kurb->actual_length, &uurb->actual_length) ||
1686 __get_user(kurb->start_frame, &uurb->start_frame) ||
1687 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1688 __get_user(kurb->error_count, &uurb->error_count) ||
1689 __get_user(kurb->signr, &uurb->signr))
1690 return -EFAULT;
1691
1692 if (__get_user(uptr, &uurb->buffer))
1693 return -EFAULT;
1694 kurb->buffer = compat_ptr(uptr);
1695 if (__get_user(uptr, &uurb->usercontext))
1696 return -EFAULT;
1697 kurb->usercontext = compat_ptr(uptr);
1698
1699 return 0;
1700 }
1701
1702 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1703 {
1704 struct usbdevfs_urb uurb;
1705
1706 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1707 return -EFAULT;
1708
1709 return proc_do_submiturb(ps, &uurb,
1710 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1711 arg);
1712 }
1713
1714 static int processcompl_compat(struct async *as, void __user * __user *arg)
1715 {
1716 struct urb *urb = as->urb;
1717 struct usbdevfs_urb32 __user *userurb = as->userurb;
1718 void __user *addr = as->userurb;
1719 unsigned int i;
1720
1721 if (as->userbuffer && urb->actual_length) {
1722 if (copy_urb_data_to_user(as->userbuffer, urb))
1723 return -EFAULT;
1724 }
1725 if (put_user(as->status, &userurb->status))
1726 return -EFAULT;
1727 if (put_user(urb->actual_length, &userurb->actual_length))
1728 return -EFAULT;
1729 if (put_user(urb->error_count, &userurb->error_count))
1730 return -EFAULT;
1731
1732 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1733 for (i = 0; i < urb->number_of_packets; i++) {
1734 if (put_user(urb->iso_frame_desc[i].actual_length,
1735 &userurb->iso_frame_desc[i].actual_length))
1736 return -EFAULT;
1737 if (put_user(urb->iso_frame_desc[i].status,
1738 &userurb->iso_frame_desc[i].status))
1739 return -EFAULT;
1740 }
1741 }
1742
1743 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1744 return -EFAULT;
1745 return 0;
1746 }
1747
1748 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1749 {
1750 struct async *as = reap_as(ps);
1751 if (as) {
1752 int retval = processcompl_compat(as, (void __user * __user *)arg);
1753 free_async(as);
1754 return retval;
1755 }
1756 if (signal_pending(current))
1757 return -EINTR;
1758 return -EIO;
1759 }
1760
1761 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1762 {
1763 int retval;
1764 struct async *as;
1765
1766 retval = -EAGAIN;
1767 as = async_getcompleted(ps);
1768 if (as) {
1769 retval = processcompl_compat(as, (void __user * __user *)arg);
1770 free_async(as);
1771 }
1772 return retval;
1773 }
1774
1775
1776 #endif
1777
1778 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1779 {
1780 struct usbdevfs_disconnectsignal ds;
1781
1782 if (copy_from_user(&ds, arg, sizeof(ds)))
1783 return -EFAULT;
1784 ps->discsignr = ds.signr;
1785 ps->disccontext = ds.context;
1786 return 0;
1787 }
1788
1789 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1790 {
1791 unsigned int ifnum;
1792
1793 if (get_user(ifnum, (unsigned int __user *)arg))
1794 return -EFAULT;
1795 return claimintf(ps, ifnum);
1796 }
1797
1798 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1799 {
1800 unsigned int ifnum;
1801 int ret;
1802
1803 if (get_user(ifnum, (unsigned int __user *)arg))
1804 return -EFAULT;
1805 if ((ret = releaseintf(ps, ifnum)) < 0)
1806 return ret;
1807 destroy_async_on_interface (ps, ifnum);
1808 return 0;
1809 }
1810
1811 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1812 {
1813 int size;
1814 void *buf = NULL;
1815 int retval = 0;
1816 struct usb_interface *intf = NULL;
1817 struct usb_driver *driver = NULL;
1818
1819 /* alloc buffer */
1820 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1821 buf = kmalloc(size, GFP_KERNEL);
1822 if (buf == NULL)
1823 return -ENOMEM;
1824 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1825 if (copy_from_user(buf, ctl->data, size)) {
1826 kfree(buf);
1827 return -EFAULT;
1828 }
1829 } else {
1830 memset(buf, 0, size);
1831 }
1832 }
1833
1834 if (!connected(ps)) {
1835 kfree(buf);
1836 return -ENODEV;
1837 }
1838
1839 if (ps->dev->state != USB_STATE_CONFIGURED)
1840 retval = -EHOSTUNREACH;
1841 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1842 retval = -EINVAL;
1843 else switch (ctl->ioctl_code) {
1844
1845 /* disconnect kernel driver from interface */
1846 case USBDEVFS_DISCONNECT:
1847 if (intf->dev.driver) {
1848 driver = to_usb_driver(intf->dev.driver);
1849 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1850 usb_driver_release_interface(driver, intf);
1851 } else
1852 retval = -ENODATA;
1853 break;
1854
1855 /* let kernel drivers try to (re)bind to the interface */
1856 case USBDEVFS_CONNECT:
1857 if (!intf->dev.driver)
1858 retval = device_attach(&intf->dev);
1859 else
1860 retval = -EBUSY;
1861 break;
1862
1863 /* talk directly to the interface's driver */
1864 default:
1865 if (intf->dev.driver)
1866 driver = to_usb_driver(intf->dev.driver);
1867 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1868 retval = -ENOTTY;
1869 } else {
1870 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1871 if (retval == -ENOIOCTLCMD)
1872 retval = -ENOTTY;
1873 }
1874 }
1875
1876 /* cleanup and return */
1877 if (retval >= 0
1878 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1879 && size > 0
1880 && copy_to_user(ctl->data, buf, size) != 0)
1881 retval = -EFAULT;
1882
1883 kfree(buf);
1884 return retval;
1885 }
1886
1887 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1888 {
1889 struct usbdevfs_ioctl ctrl;
1890
1891 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1892 return -EFAULT;
1893 return proc_ioctl(ps, &ctrl);
1894 }
1895
1896 #ifdef CONFIG_COMPAT
1897 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1898 {
1899 struct usbdevfs_ioctl32 __user *uioc;
1900 struct usbdevfs_ioctl ctrl;
1901 u32 udata;
1902
1903 uioc = compat_ptr((long)arg);
1904 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1905 __get_user(ctrl.ifno, &uioc->ifno) ||
1906 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1907 __get_user(udata, &uioc->data))
1908 return -EFAULT;
1909 ctrl.data = compat_ptr(udata);
1910
1911 return proc_ioctl(ps, &ctrl);
1912 }
1913 #endif
1914
1915 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1916 {
1917 unsigned portnum;
1918 int rc;
1919
1920 if (get_user(portnum, (unsigned __user *) arg))
1921 return -EFAULT;
1922 rc = usb_hub_claim_port(ps->dev, portnum, ps);
1923 if (rc == 0)
1924 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1925 portnum, task_pid_nr(current), current->comm);
1926 return rc;
1927 }
1928
1929 static int proc_release_port(struct dev_state *ps, void __user *arg)
1930 {
1931 unsigned portnum;
1932
1933 if (get_user(portnum, (unsigned __user *) arg))
1934 return -EFAULT;
1935 return usb_hub_release_port(ps->dev, portnum, ps);
1936 }
1937
1938 static int proc_get_capabilities(struct dev_state *ps, void __user *arg)
1939 {
1940 __u32 caps;
1941
1942 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM;
1943 if (!ps->dev->bus->no_stop_on_short)
1944 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
1945 if (ps->dev->bus->sg_tablesize)
1946 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
1947
1948 if (put_user(caps, (__u32 __user *)arg))
1949 return -EFAULT;
1950
1951 return 0;
1952 }
1953
1954 static int proc_disconnect_claim(struct dev_state *ps, void __user *arg)
1955 {
1956 struct usbdevfs_disconnect_claim dc;
1957 struct usb_interface *intf;
1958
1959 if (copy_from_user(&dc, arg, sizeof(dc)))
1960 return -EFAULT;
1961
1962 intf = usb_ifnum_to_if(ps->dev, dc.interface);
1963 if (!intf)
1964 return -EINVAL;
1965
1966 if (intf->dev.driver) {
1967 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
1968
1969 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
1970 strncmp(dc.driver, intf->dev.driver->name,
1971 sizeof(dc.driver)) != 0)
1972 return -EBUSY;
1973
1974 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
1975 strncmp(dc.driver, intf->dev.driver->name,
1976 sizeof(dc.driver)) == 0)
1977 return -EBUSY;
1978
1979 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1980 usb_driver_release_interface(driver, intf);
1981 }
1982
1983 return claimintf(ps, dc.interface);
1984 }
1985
1986 /*
1987 * NOTE: All requests here that have interface numbers as parameters
1988 * are assuming that somehow the configuration has been prevented from
1989 * changing. But there's no mechanism to ensure that...
1990 */
1991 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1992 void __user *p)
1993 {
1994 struct dev_state *ps = file->private_data;
1995 struct inode *inode = file_inode(file);
1996 struct usb_device *dev = ps->dev;
1997 int ret = -ENOTTY;
1998
1999 if (!(file->f_mode & FMODE_WRITE))
2000 return -EPERM;
2001
2002 usb_lock_device(dev);
2003 if (!connected(ps)) {
2004 usb_unlock_device(dev);
2005 return -ENODEV;
2006 }
2007
2008 switch (cmd) {
2009 case USBDEVFS_CONTROL:
2010 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2011 ret = proc_control(ps, p);
2012 if (ret >= 0)
2013 inode->i_mtime = CURRENT_TIME;
2014 break;
2015
2016 case USBDEVFS_BULK:
2017 snoop(&dev->dev, "%s: BULK\n", __func__);
2018 ret = proc_bulk(ps, p);
2019 if (ret >= 0)
2020 inode->i_mtime = CURRENT_TIME;
2021 break;
2022
2023 case USBDEVFS_RESETEP:
2024 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2025 ret = proc_resetep(ps, p);
2026 if (ret >= 0)
2027 inode->i_mtime = CURRENT_TIME;
2028 break;
2029
2030 case USBDEVFS_RESET:
2031 snoop(&dev->dev, "%s: RESET\n", __func__);
2032 ret = proc_resetdevice(ps);
2033 break;
2034
2035 case USBDEVFS_CLEAR_HALT:
2036 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2037 ret = proc_clearhalt(ps, p);
2038 if (ret >= 0)
2039 inode->i_mtime = CURRENT_TIME;
2040 break;
2041
2042 case USBDEVFS_GETDRIVER:
2043 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2044 ret = proc_getdriver(ps, p);
2045 break;
2046
2047 case USBDEVFS_CONNECTINFO:
2048 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2049 ret = proc_connectinfo(ps, p);
2050 break;
2051
2052 case USBDEVFS_SETINTERFACE:
2053 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2054 ret = proc_setintf(ps, p);
2055 break;
2056
2057 case USBDEVFS_SETCONFIGURATION:
2058 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2059 ret = proc_setconfig(ps, p);
2060 break;
2061
2062 case USBDEVFS_SUBMITURB:
2063 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2064 ret = proc_submiturb(ps, p);
2065 if (ret >= 0)
2066 inode->i_mtime = CURRENT_TIME;
2067 break;
2068
2069 #ifdef CONFIG_COMPAT
2070 case USBDEVFS_CONTROL32:
2071 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2072 ret = proc_control_compat(ps, p);
2073 if (ret >= 0)
2074 inode->i_mtime = CURRENT_TIME;
2075 break;
2076
2077 case USBDEVFS_BULK32:
2078 snoop(&dev->dev, "%s: BULK32\n", __func__);
2079 ret = proc_bulk_compat(ps, p);
2080 if (ret >= 0)
2081 inode->i_mtime = CURRENT_TIME;
2082 break;
2083
2084 case USBDEVFS_DISCSIGNAL32:
2085 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2086 ret = proc_disconnectsignal_compat(ps, p);
2087 break;
2088
2089 case USBDEVFS_SUBMITURB32:
2090 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2091 ret = proc_submiturb_compat(ps, p);
2092 if (ret >= 0)
2093 inode->i_mtime = CURRENT_TIME;
2094 break;
2095
2096 case USBDEVFS_REAPURB32:
2097 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2098 ret = proc_reapurb_compat(ps, p);
2099 break;
2100
2101 case USBDEVFS_REAPURBNDELAY32:
2102 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2103 ret = proc_reapurbnonblock_compat(ps, p);
2104 break;
2105
2106 case USBDEVFS_IOCTL32:
2107 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2108 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2109 break;
2110 #endif
2111
2112 case USBDEVFS_DISCARDURB:
2113 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
2114 ret = proc_unlinkurb(ps, p);
2115 break;
2116
2117 case USBDEVFS_REAPURB:
2118 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2119 ret = proc_reapurb(ps, p);
2120 break;
2121
2122 case USBDEVFS_REAPURBNDELAY:
2123 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2124 ret = proc_reapurbnonblock(ps, p);
2125 break;
2126
2127 case USBDEVFS_DISCSIGNAL:
2128 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2129 ret = proc_disconnectsignal(ps, p);
2130 break;
2131
2132 case USBDEVFS_CLAIMINTERFACE:
2133 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2134 ret = proc_claiminterface(ps, p);
2135 break;
2136
2137 case USBDEVFS_RELEASEINTERFACE:
2138 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2139 ret = proc_releaseinterface(ps, p);
2140 break;
2141
2142 case USBDEVFS_IOCTL:
2143 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2144 ret = proc_ioctl_default(ps, p);
2145 break;
2146
2147 case USBDEVFS_CLAIM_PORT:
2148 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2149 ret = proc_claim_port(ps, p);
2150 break;
2151
2152 case USBDEVFS_RELEASE_PORT:
2153 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2154 ret = proc_release_port(ps, p);
2155 break;
2156 case USBDEVFS_GET_CAPABILITIES:
2157 ret = proc_get_capabilities(ps, p);
2158 break;
2159 case USBDEVFS_DISCONNECT_CLAIM:
2160 ret = proc_disconnect_claim(ps, p);
2161 break;
2162 }
2163 usb_unlock_device(dev);
2164 if (ret >= 0)
2165 inode->i_atime = CURRENT_TIME;
2166 return ret;
2167 }
2168
2169 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2170 unsigned long arg)
2171 {
2172 int ret;
2173
2174 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2175
2176 return ret;
2177 }
2178
2179 #ifdef CONFIG_COMPAT
2180 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2181 unsigned long arg)
2182 {
2183 int ret;
2184
2185 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2186
2187 return ret;
2188 }
2189 #endif
2190
2191 /* No kernel lock - fine */
2192 static unsigned int usbdev_poll(struct file *file,
2193 struct poll_table_struct *wait)
2194 {
2195 struct dev_state *ps = file->private_data;
2196 unsigned int mask = 0;
2197
2198 poll_wait(file, &ps->wait, wait);
2199 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2200 mask |= POLLOUT | POLLWRNORM;
2201 if (!connected(ps))
2202 mask |= POLLERR | POLLHUP;
2203 return mask;
2204 }
2205
2206 const struct file_operations usbdev_file_operations = {
2207 .owner = THIS_MODULE,
2208 .llseek = usbdev_lseek,
2209 .read = usbdev_read,
2210 .poll = usbdev_poll,
2211 .unlocked_ioctl = usbdev_ioctl,
2212 #ifdef CONFIG_COMPAT
2213 .compat_ioctl = usbdev_compat_ioctl,
2214 #endif
2215 .open = usbdev_open,
2216 .release = usbdev_release,
2217 };
2218
2219 static void usbdev_remove(struct usb_device *udev)
2220 {
2221 struct dev_state *ps;
2222 struct siginfo sinfo;
2223
2224 while (!list_empty(&udev->filelist)) {
2225 ps = list_entry(udev->filelist.next, struct dev_state, list);
2226 destroy_all_async(ps);
2227 wake_up_all(&ps->wait);
2228 list_del_init(&ps->list);
2229 if (ps->discsignr) {
2230 sinfo.si_signo = ps->discsignr;
2231 sinfo.si_errno = EPIPE;
2232 sinfo.si_code = SI_ASYNCIO;
2233 sinfo.si_addr = ps->disccontext;
2234 kill_pid_info_as_cred(ps->discsignr, &sinfo,
2235 ps->disc_pid, ps->cred, ps->secid);
2236 }
2237 }
2238 }
2239
2240 static int usbdev_notify(struct notifier_block *self,
2241 unsigned long action, void *dev)
2242 {
2243 switch (action) {
2244 case USB_DEVICE_ADD:
2245 break;
2246 case USB_DEVICE_REMOVE:
2247 usbdev_remove(dev);
2248 break;
2249 }
2250 return NOTIFY_OK;
2251 }
2252
2253 static struct notifier_block usbdev_nb = {
2254 .notifier_call = usbdev_notify,
2255 };
2256
2257 static struct cdev usb_device_cdev;
2258
2259 int __init usb_devio_init(void)
2260 {
2261 int retval;
2262
2263 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2264 "usb_device");
2265 if (retval) {
2266 printk(KERN_ERR "Unable to register minors for usb_device\n");
2267 goto out;
2268 }
2269 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2270 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2271 if (retval) {
2272 printk(KERN_ERR "Unable to get usb_device major %d\n",
2273 USB_DEVICE_MAJOR);
2274 goto error_cdev;
2275 }
2276 usb_register_notify(&usbdev_nb);
2277 out:
2278 return retval;
2279
2280 error_cdev:
2281 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2282 goto out;
2283 }
2284
2285 void usb_devio_cleanup(void)
2286 {
2287 usb_unregister_notify(&usbdev_nb);
2288 cdev_del(&usb_device_cdev);
2289 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2290 }
Linux kernel - Deliverables
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