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of: MSI: Simplify irqdomain lookup
[linux/fpc-iii.git] / drivers / usb / core / devio.c
blob38ae877c46e3124eb07c2a46ddd33bc66ac54d93
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 usb_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 usb_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 usb_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 usb_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 usb_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 usb_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 usb_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 usb_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 usb_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 usb_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 memset(&sinfo, 0, sizeof(sinfo));
505 sinfo.si_signo = as->signr;
506 sinfo.si_errno = as->status;
507 sinfo.si_code = SI_ASYNCIO;
508 sinfo.si_addr = as->userurb;
509 pid = get_pid(as->pid);
510 cred = get_cred(as->cred);
511 secid = as->secid;
512 }
513 snoop(&urb->dev->dev, "urb complete\n");
514 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
515 as->status, COMPLETE, NULL, 0);
516 if ((urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN)
517 snoop_urb_data(urb, urb->actual_length);
518
519 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
520 as->status != -ENOENT)
521 cancel_bulk_urbs(ps, as->bulk_addr);
522 spin_unlock(&ps->lock);
523
524 if (signr) {
525 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
526 put_pid(pid);
527 put_cred(cred);
528 }
529
530 wake_up(&ps->wait);
531 }
532
533 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
534 {
535 struct urb *urb;
536 struct async *as;
537 unsigned long flags;
538
539 spin_lock_irqsave(&ps->lock, flags);
540 while (!list_empty(list)) {
541 as = list_entry(list->next, struct async, asynclist);
542 list_del_init(&as->asynclist);
543 urb = as->urb;
544 usb_get_urb(urb);
545
546 /* drop the spinlock so the completion handler can run */
547 spin_unlock_irqrestore(&ps->lock, flags);
548 usb_kill_urb(urb);
549 usb_put_urb(urb);
550 spin_lock_irqsave(&ps->lock, flags);
551 }
552 spin_unlock_irqrestore(&ps->lock, flags);
553 }
554
555 static void destroy_async_on_interface(struct usb_dev_state *ps,
556 unsigned int ifnum)
557 {
558 struct list_head *p, *q, hitlist;
559 unsigned long flags;
560
561 INIT_LIST_HEAD(&hitlist);
562 spin_lock_irqsave(&ps->lock, flags);
563 list_for_each_safe(p, q, &ps->async_pending)
564 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
565 list_move_tail(p, &hitlist);
566 spin_unlock_irqrestore(&ps->lock, flags);
567 destroy_async(ps, &hitlist);
568 }
569
570 static void destroy_all_async(struct usb_dev_state *ps)
571 {
572 destroy_async(ps, &ps->async_pending);
573 }
574
575 /*
576 * interface claims are made only at the request of user level code,
577 * which can also release them (explicitly or by closing files).
578 * they're also undone when devices disconnect.
579 */
580
581 static int driver_probe(struct usb_interface *intf,
582 const struct usb_device_id *id)
583 {
584 return -ENODEV;
585 }
586
587 static void driver_disconnect(struct usb_interface *intf)
588 {
589 struct usb_dev_state *ps = usb_get_intfdata(intf);
590 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
591
592 if (!ps)
593 return;
594
595 /* NOTE: this relies on usbcore having canceled and completed
596 * all pending I/O requests; 2.6 does that.
597 */
598
599 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
600 clear_bit(ifnum, &ps->ifclaimed);
601 else
602 dev_warn(&intf->dev, "interface number %u out of range\n",
603 ifnum);
604
605 usb_set_intfdata(intf, NULL);
606
607 /* force async requests to complete */
608 destroy_async_on_interface(ps, ifnum);
609 }
610
611 /* The following routines are merely placeholders. There is no way
612 * to inform a user task about suspend or resumes.
613 */
614 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
615 {
616 return 0;
617 }
618
619 static int driver_resume(struct usb_interface *intf)
620 {
621 return 0;
622 }
623
624 struct usb_driver usbfs_driver = {
625 .name = "usbfs",
626 .probe = driver_probe,
627 .disconnect = driver_disconnect,
628 .suspend = driver_suspend,
629 .resume = driver_resume,
630 };
631
632 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
633 {
634 struct usb_device *dev = ps->dev;
635 struct usb_interface *intf;
636 int err;
637
638 if (ifnum >= 8*sizeof(ps->ifclaimed))
639 return -EINVAL;
640 /* already claimed */
641 if (test_bit(ifnum, &ps->ifclaimed))
642 return 0;
643
644 intf = usb_ifnum_to_if(dev, ifnum);
645 if (!intf)
646 err = -ENOENT;
647 else
648 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
649 if (err == 0)
650 set_bit(ifnum, &ps->ifclaimed);
651 return err;
652 }
653
654 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
655 {
656 struct usb_device *dev;
657 struct usb_interface *intf;
658 int err;
659
660 err = -EINVAL;
661 if (ifnum >= 8*sizeof(ps->ifclaimed))
662 return err;
663 dev = ps->dev;
664 intf = usb_ifnum_to_if(dev, ifnum);
665 if (!intf)
666 err = -ENOENT;
667 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
668 usb_driver_release_interface(&usbfs_driver, intf);
669 err = 0;
670 }
671 return err;
672 }
673
674 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
675 {
676 if (ps->dev->state != USB_STATE_CONFIGURED)
677 return -EHOSTUNREACH;
678 if (ifnum >= 8*sizeof(ps->ifclaimed))
679 return -EINVAL;
680 if (test_bit(ifnum, &ps->ifclaimed))
681 return 0;
682 /* if not yet claimed, claim it for the driver */
683 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
684 "interface %u before use\n", task_pid_nr(current),
685 current->comm, ifnum);
686 return claimintf(ps, ifnum);
687 }
688
689 static int findintfep(struct usb_device *dev, unsigned int ep)
690 {
691 unsigned int i, j, e;
692 struct usb_interface *intf;
693 struct usb_host_interface *alts;
694 struct usb_endpoint_descriptor *endpt;
695
696 if (ep & ~(USB_DIR_IN|0xf))
697 return -EINVAL;
698 if (!dev->actconfig)
699 return -ESRCH;
700 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
701 intf = dev->actconfig->interface[i];
702 for (j = 0; j < intf->num_altsetting; j++) {
703 alts = &intf->altsetting[j];
704 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
705 endpt = &alts->endpoint[e].desc;
706 if (endpt->bEndpointAddress == ep)
707 return alts->desc.bInterfaceNumber;
708 }
709 }
710 }
711 return -ENOENT;
712 }
713
714 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
715 unsigned int request, unsigned int index)
716 {
717 int ret = 0;
718 struct usb_host_interface *alt_setting;
719
720 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
721 && ps->dev->state != USB_STATE_ADDRESS
722 && ps->dev->state != USB_STATE_CONFIGURED)
723 return -EHOSTUNREACH;
724 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
725 return 0;
726
727 /*
728 * check for the special corner case 'get_device_id' in the printer
729 * class specification, which we always want to allow as it is used
730 * to query things like ink level, etc.
731 */
732 if (requesttype == 0xa1 && request == 0) {
733 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
734 index >> 8, index & 0xff);
735 if (alt_setting
736 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
737 return 0;
738 }
739
740 index &= 0xff;
741 switch (requesttype & USB_RECIP_MASK) {
742 case USB_RECIP_ENDPOINT:
743 if ((index & ~USB_DIR_IN) == 0)
744 return 0;
745 ret = findintfep(ps->dev, index);
746 if (ret < 0) {
747 /*
748 * Some not fully compliant Win apps seem to get
749 * index wrong and have the endpoint number here
750 * rather than the endpoint address (with the
751 * correct direction). Win does let this through,
752 * so we'll not reject it here but leave it to
753 * the device to not break KVM. But we warn.
754 */
755 ret = findintfep(ps->dev, index ^ 0x80);
756 if (ret >= 0)
757 dev_info(&ps->dev->dev,
758 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
759 __func__, task_pid_nr(current),
760 current->comm, index, index ^ 0x80);
761 }
762 if (ret >= 0)
763 ret = checkintf(ps, ret);
764 break;
765
766 case USB_RECIP_INTERFACE:
767 ret = checkintf(ps, index);
768 break;
769 }
770 return ret;
771 }
772
773 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
774 unsigned char ep)
775 {
776 if (ep & USB_ENDPOINT_DIR_MASK)
777 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
778 else
779 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
780 }
781
782 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
783 struct usbdevfs_streams __user *streams,
784 unsigned int *num_streams_ret,
785 unsigned int *num_eps_ret,
786 struct usb_host_endpoint ***eps_ret,
787 struct usb_interface **intf_ret)
788 {
789 unsigned int i, num_streams, num_eps;
790 struct usb_host_endpoint **eps;
791 struct usb_interface *intf = NULL;
792 unsigned char ep;
793 int ifnum, ret;
794
795 if (get_user(num_streams, &streams->num_streams) ||
796 get_user(num_eps, &streams->num_eps))
797 return -EFAULT;
798
799 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
800 return -EINVAL;
801
802 /* The XHCI controller allows max 2 ^ 16 streams */
803 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
804 return -EINVAL;
805
806 eps = kmalloc(num_eps * sizeof(*eps), GFP_KERNEL);
807 if (!eps)
808 return -ENOMEM;
809
810 for (i = 0; i < num_eps; i++) {
811 if (get_user(ep, &streams->eps[i])) {
812 ret = -EFAULT;
813 goto error;
814 }
815 eps[i] = ep_to_host_endpoint(ps->dev, ep);
816 if (!eps[i]) {
817 ret = -EINVAL;
818 goto error;
819 }
820
821 /* usb_alloc/free_streams operate on an usb_interface */
822 ifnum = findintfep(ps->dev, ep);
823 if (ifnum < 0) {
824 ret = ifnum;
825 goto error;
826 }
827
828 if (i == 0) {
829 ret = checkintf(ps, ifnum);
830 if (ret < 0)
831 goto error;
832 intf = usb_ifnum_to_if(ps->dev, ifnum);
833 } else {
834 /* Verify all eps belong to the same interface */
835 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
836 ret = -EINVAL;
837 goto error;
838 }
839 }
840 }
841
842 if (num_streams_ret)
843 *num_streams_ret = num_streams;
844 *num_eps_ret = num_eps;
845 *eps_ret = eps;
846 *intf_ret = intf;
847
848 return 0;
849
850 error:
851 kfree(eps);
852 return ret;
853 }
854
855 static int match_devt(struct device *dev, void *data)
856 {
857 return dev->devt == (dev_t) (unsigned long) data;
858 }
859
860 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
861 {
862 struct device *dev;
863
864 dev = bus_find_device(&usb_bus_type, NULL,
865 (void *) (unsigned long) devt, match_devt);
866 if (!dev)
867 return NULL;
868 return container_of(dev, struct usb_device, dev);
869 }
870
871 /*
872 * file operations
873 */
874 static int usbdev_open(struct inode *inode, struct file *file)
875 {
876 struct usb_device *dev = NULL;
877 struct usb_dev_state *ps;
878 int ret;
879
880 ret = -ENOMEM;
881 ps = kmalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
882 if (!ps)
883 goto out_free_ps;
884
885 ret = -ENODEV;
886
887 /* Protect against simultaneous removal or release */
888 mutex_lock(&usbfs_mutex);
889
890 /* usbdev device-node */
891 if (imajor(inode) == USB_DEVICE_MAJOR)
892 dev = usbdev_lookup_by_devt(inode->i_rdev);
893
894 mutex_unlock(&usbfs_mutex);
895
896 if (!dev)
897 goto out_free_ps;
898
899 usb_lock_device(dev);
900 if (dev->state == USB_STATE_NOTATTACHED)
901 goto out_unlock_device;
902
903 ret = usb_autoresume_device(dev);
904 if (ret)
905 goto out_unlock_device;
906
907 ps->dev = dev;
908 ps->file = file;
909 spin_lock_init(&ps->lock);
910 INIT_LIST_HEAD(&ps->list);
911 INIT_LIST_HEAD(&ps->async_pending);
912 INIT_LIST_HEAD(&ps->async_completed);
913 init_waitqueue_head(&ps->wait);
914 ps->discsignr = 0;
915 ps->disc_pid = get_pid(task_pid(current));
916 ps->cred = get_current_cred();
917 ps->disccontext = NULL;
918 ps->ifclaimed = 0;
919 security_task_getsecid(current, &ps->secid);
920 smp_wmb();
921 list_add_tail(&ps->list, &dev->filelist);
922 file->private_data = ps;
923 usb_unlock_device(dev);
924 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
925 current->comm);
926 return ret;
927
928 out_unlock_device:
929 usb_unlock_device(dev);
930 usb_put_dev(dev);
931 out_free_ps:
932 kfree(ps);
933 return ret;
934 }
935
936 static int usbdev_release(struct inode *inode, struct file *file)
937 {
938 struct usb_dev_state *ps = file->private_data;
939 struct usb_device *dev = ps->dev;
940 unsigned int ifnum;
941 struct async *as;
942
943 usb_lock_device(dev);
944 usb_hub_release_all_ports(dev, ps);
945
946 list_del_init(&ps->list);
947
948 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
949 ifnum++) {
950 if (test_bit(ifnum, &ps->ifclaimed))
951 releaseintf(ps, ifnum);
952 }
953 destroy_all_async(ps);
954 usb_autosuspend_device(dev);
955 usb_unlock_device(dev);
956 usb_put_dev(dev);
957 put_pid(ps->disc_pid);
958 put_cred(ps->cred);
959
960 as = async_getcompleted(ps);
961 while (as) {
962 free_async(as);
963 as = async_getcompleted(ps);
964 }
965 kfree(ps);
966 return 0;
967 }
968
969 static int proc_control(struct usb_dev_state *ps, void __user *arg)
970 {
971 struct usb_device *dev = ps->dev;
972 struct usbdevfs_ctrltransfer ctrl;
973 unsigned int tmo;
974 unsigned char *tbuf;
975 unsigned wLength;
976 int i, pipe, ret;
977
978 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
979 return -EFAULT;
980 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
981 ctrl.wIndex);
982 if (ret)
983 return ret;
984 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
985 if (wLength > PAGE_SIZE)
986 return -EINVAL;
987 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
988 sizeof(struct usb_ctrlrequest));
989 if (ret)
990 return ret;
991 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
992 if (!tbuf) {
993 ret = -ENOMEM;
994 goto done;
995 }
996 tmo = ctrl.timeout;
997 snoop(&dev->dev, "control urb: bRequestType=%02x "
998 "bRequest=%02x wValue=%04x "
999 "wIndex=%04x wLength=%04x\n",
1000 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1001 ctrl.wIndex, ctrl.wLength);
1002 if (ctrl.bRequestType & 0x80) {
1003 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
1004 ctrl.wLength)) {
1005 ret = -EINVAL;
1006 goto done;
1007 }
1008 pipe = usb_rcvctrlpipe(dev, 0);
1009 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1010
1011 usb_unlock_device(dev);
1012 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1013 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1014 tbuf, ctrl.wLength, tmo);
1015 usb_lock_device(dev);
1016 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1017 tbuf, max(i, 0));
1018 if ((i > 0) && ctrl.wLength) {
1019 if (copy_to_user(ctrl.data, tbuf, i)) {
1020 ret = -EFAULT;
1021 goto done;
1022 }
1023 }
1024 } else {
1025 if (ctrl.wLength) {
1026 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1027 ret = -EFAULT;
1028 goto done;
1029 }
1030 }
1031 pipe = usb_sndctrlpipe(dev, 0);
1032 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1033 tbuf, ctrl.wLength);
1034
1035 usb_unlock_device(dev);
1036 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1037 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1038 tbuf, ctrl.wLength, tmo);
1039 usb_lock_device(dev);
1040 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1041 }
1042 if (i < 0 && i != -EPIPE) {
1043 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1044 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1045 current->comm, ctrl.bRequestType, ctrl.bRequest,
1046 ctrl.wLength, i);
1047 }
1048 ret = i;
1049 done:
1050 free_page((unsigned long) tbuf);
1051 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1052 sizeof(struct usb_ctrlrequest));
1053 return ret;
1054 }
1055
1056 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1057 {
1058 struct usb_device *dev = ps->dev;
1059 struct usbdevfs_bulktransfer bulk;
1060 unsigned int tmo, len1, pipe;
1061 int len2;
1062 unsigned char *tbuf;
1063 int i, ret;
1064
1065 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1066 return -EFAULT;
1067 ret = findintfep(ps->dev, bulk.ep);
1068 if (ret < 0)
1069 return ret;
1070 ret = checkintf(ps, ret);
1071 if (ret)
1072 return ret;
1073 if (bulk.ep & USB_DIR_IN)
1074 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1075 else
1076 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1077 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1078 return -EINVAL;
1079 len1 = bulk.len;
1080 if (len1 >= USBFS_XFER_MAX)
1081 return -EINVAL;
1082 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1083 if (ret)
1084 return ret;
1085 tbuf = kmalloc(len1, GFP_KERNEL);
1086 if (!tbuf) {
1087 ret = -ENOMEM;
1088 goto done;
1089 }
1090 tmo = bulk.timeout;
1091 if (bulk.ep & 0x80) {
1092 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1093 ret = -EINVAL;
1094 goto done;
1095 }
1096 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1097
1098 usb_unlock_device(dev);
1099 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1100 usb_lock_device(dev);
1101 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1102
1103 if (!i && len2) {
1104 if (copy_to_user(bulk.data, tbuf, len2)) {
1105 ret = -EFAULT;
1106 goto done;
1107 }
1108 }
1109 } else {
1110 if (len1) {
1111 if (copy_from_user(tbuf, bulk.data, len1)) {
1112 ret = -EFAULT;
1113 goto done;
1114 }
1115 }
1116 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1117
1118 usb_unlock_device(dev);
1119 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1120 usb_lock_device(dev);
1121 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1122 }
1123 ret = (i < 0 ? i : len2);
1124 done:
1125 kfree(tbuf);
1126 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1127 return ret;
1128 }
1129
1130 static void check_reset_of_active_ep(struct usb_device *udev,
1131 unsigned int epnum, char *ioctl_name)
1132 {
1133 struct usb_host_endpoint **eps;
1134 struct usb_host_endpoint *ep;
1135
1136 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1137 ep = eps[epnum & 0x0f];
1138 if (ep && !list_empty(&ep->urb_list))
1139 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1140 task_pid_nr(current), current->comm,
1141 ioctl_name, epnum);
1142 }
1143
1144 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1145 {
1146 unsigned int ep;
1147 int ret;
1148
1149 if (get_user(ep, (unsigned int __user *)arg))
1150 return -EFAULT;
1151 ret = findintfep(ps->dev, ep);
1152 if (ret < 0)
1153 return ret;
1154 ret = checkintf(ps, ret);
1155 if (ret)
1156 return ret;
1157 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1158 usb_reset_endpoint(ps->dev, ep);
1159 return 0;
1160 }
1161
1162 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1163 {
1164 unsigned int ep;
1165 int pipe;
1166 int ret;
1167
1168 if (get_user(ep, (unsigned int __user *)arg))
1169 return -EFAULT;
1170 ret = findintfep(ps->dev, ep);
1171 if (ret < 0)
1172 return ret;
1173 ret = checkintf(ps, ret);
1174 if (ret)
1175 return ret;
1176 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1177 if (ep & USB_DIR_IN)
1178 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1179 else
1180 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1181
1182 return usb_clear_halt(ps->dev, pipe);
1183 }
1184
1185 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1186 {
1187 struct usbdevfs_getdriver gd;
1188 struct usb_interface *intf;
1189 int ret;
1190
1191 if (copy_from_user(&gd, arg, sizeof(gd)))
1192 return -EFAULT;
1193 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1194 if (!intf || !intf->dev.driver)
1195 ret = -ENODATA;
1196 else {
1197 strlcpy(gd.driver, intf->dev.driver->name,
1198 sizeof(gd.driver));
1199 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1200 }
1201 return ret;
1202 }
1203
1204 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1205 {
1206 struct usbdevfs_connectinfo ci = {
1207 .devnum = ps->dev->devnum,
1208 .slow = ps->dev->speed == USB_SPEED_LOW
1209 };
1210
1211 if (copy_to_user(arg, &ci, sizeof(ci)))
1212 return -EFAULT;
1213 return 0;
1214 }
1215
1216 static int proc_resetdevice(struct usb_dev_state *ps)
1217 {
1218 return usb_reset_device(ps->dev);
1219 }
1220
1221 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1222 {
1223 struct usbdevfs_setinterface setintf;
1224 int ret;
1225
1226 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1227 return -EFAULT;
1228 ret = checkintf(ps, setintf.interface);
1229 if (ret)
1230 return ret;
1231
1232 destroy_async_on_interface(ps, setintf.interface);
1233
1234 return usb_set_interface(ps->dev, setintf.interface,
1235 setintf.altsetting);
1236 }
1237
1238 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1239 {
1240 int u;
1241 int status = 0;
1242 struct usb_host_config *actconfig;
1243
1244 if (get_user(u, (int __user *)arg))
1245 return -EFAULT;
1246
1247 actconfig = ps->dev->actconfig;
1248
1249 /* Don't touch the device if any interfaces are claimed.
1250 * It could interfere with other drivers' operations, and if
1251 * an interface is claimed by usbfs it could easily deadlock.
1252 */
1253 if (actconfig) {
1254 int i;
1255
1256 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1257 if (usb_interface_claimed(actconfig->interface[i])) {
1258 dev_warn(&ps->dev->dev,
1259 "usbfs: interface %d claimed by %s "
1260 "while '%s' sets config #%d\n",
1261 actconfig->interface[i]
1262 ->cur_altsetting
1263 ->desc.bInterfaceNumber,
1264 actconfig->interface[i]
1265 ->dev.driver->name,
1266 current->comm, u);
1267 status = -EBUSY;
1268 break;
1269 }
1270 }
1271 }
1272
1273 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1274 * so avoid usb_set_configuration()'s kick to sysfs
1275 */
1276 if (status == 0) {
1277 if (actconfig && actconfig->desc.bConfigurationValue == u)
1278 status = usb_reset_configuration(ps->dev);
1279 else
1280 status = usb_set_configuration(ps->dev, u);
1281 }
1282
1283 return status;
1284 }
1285
1286 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1287 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1288 void __user *arg)
1289 {
1290 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1291 struct usb_host_endpoint *ep;
1292 struct async *as = NULL;
1293 struct usb_ctrlrequest *dr = NULL;
1294 unsigned int u, totlen, isofrmlen;
1295 int i, ret, is_in, num_sgs = 0, ifnum = -1;
1296 int number_of_packets = 0;
1297 unsigned int stream_id = 0;
1298 void *buf;
1299
1300 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1301 USBDEVFS_URB_SHORT_NOT_OK |
1302 USBDEVFS_URB_BULK_CONTINUATION |
1303 USBDEVFS_URB_NO_FSBR |
1304 USBDEVFS_URB_ZERO_PACKET |
1305 USBDEVFS_URB_NO_INTERRUPT))
1306 return -EINVAL;
1307 if (uurb->buffer_length > 0 && !uurb->buffer)
1308 return -EINVAL;
1309 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1310 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1311 ifnum = findintfep(ps->dev, uurb->endpoint);
1312 if (ifnum < 0)
1313 return ifnum;
1314 ret = checkintf(ps, ifnum);
1315 if (ret)
1316 return ret;
1317 }
1318 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1319 if (!ep)
1320 return -ENOENT;
1321 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1322
1323 u = 0;
1324 switch (uurb->type) {
1325 case USBDEVFS_URB_TYPE_CONTROL:
1326 if (!usb_endpoint_xfer_control(&ep->desc))
1327 return -EINVAL;
1328 /* min 8 byte setup packet */
1329 if (uurb->buffer_length < 8)
1330 return -EINVAL;
1331 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1332 if (!dr)
1333 return -ENOMEM;
1334 if (copy_from_user(dr, uurb->buffer, 8)) {
1335 ret = -EFAULT;
1336 goto error;
1337 }
1338 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1339 ret = -EINVAL;
1340 goto error;
1341 }
1342 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1343 le16_to_cpup(&dr->wIndex));
1344 if (ret)
1345 goto error;
1346 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1347 uurb->buffer += 8;
1348 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1349 is_in = 1;
1350 uurb->endpoint |= USB_DIR_IN;
1351 } else {
1352 is_in = 0;
1353 uurb->endpoint &= ~USB_DIR_IN;
1354 }
1355 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1356 "bRequest=%02x wValue=%04x "
1357 "wIndex=%04x wLength=%04x\n",
1358 dr->bRequestType, dr->bRequest,
1359 __le16_to_cpup(&dr->wValue),
1360 __le16_to_cpup(&dr->wIndex),
1361 __le16_to_cpup(&dr->wLength));
1362 u = sizeof(struct usb_ctrlrequest);
1363 break;
1364
1365 case USBDEVFS_URB_TYPE_BULK:
1366 switch (usb_endpoint_type(&ep->desc)) {
1367 case USB_ENDPOINT_XFER_CONTROL:
1368 case USB_ENDPOINT_XFER_ISOC:
1369 return -EINVAL;
1370 case USB_ENDPOINT_XFER_INT:
1371 /* allow single-shot interrupt transfers */
1372 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1373 goto interrupt_urb;
1374 }
1375 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1376 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1377 num_sgs = 0;
1378 if (ep->streams)
1379 stream_id = uurb->stream_id;
1380 break;
1381
1382 case USBDEVFS_URB_TYPE_INTERRUPT:
1383 if (!usb_endpoint_xfer_int(&ep->desc))
1384 return -EINVAL;
1385 interrupt_urb:
1386 break;
1387
1388 case USBDEVFS_URB_TYPE_ISO:
1389 /* arbitrary limit */
1390 if (uurb->number_of_packets < 1 ||
1391 uurb->number_of_packets > 128)
1392 return -EINVAL;
1393 if (!usb_endpoint_xfer_isoc(&ep->desc))
1394 return -EINVAL;
1395 number_of_packets = uurb->number_of_packets;
1396 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1397 number_of_packets;
1398 isopkt = kmalloc(isofrmlen, GFP_KERNEL);
1399 if (!isopkt)
1400 return -ENOMEM;
1401 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1402 ret = -EFAULT;
1403 goto error;
1404 }
1405 for (totlen = u = 0; u < number_of_packets; u++) {
1406 /*
1407 * arbitrary limit need for USB 3.0
1408 * bMaxBurst (0~15 allowed, 1~16 packets)
1409 * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1410 * sizemax: 1024 * 16 * 3 = 49152
1411 */
1412 if (isopkt[u].length > 49152) {
1413 ret = -EINVAL;
1414 goto error;
1415 }
1416 totlen += isopkt[u].length;
1417 }
1418 u *= sizeof(struct usb_iso_packet_descriptor);
1419 uurb->buffer_length = totlen;
1420 break;
1421
1422 default:
1423 return -EINVAL;
1424 }
1425
1426 if (uurb->buffer_length >= USBFS_XFER_MAX) {
1427 ret = -EINVAL;
1428 goto error;
1429 }
1430 if (uurb->buffer_length > 0 &&
1431 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1432 uurb->buffer, uurb->buffer_length)) {
1433 ret = -EFAULT;
1434 goto error;
1435 }
1436 as = alloc_async(number_of_packets);
1437 if (!as) {
1438 ret = -ENOMEM;
1439 goto error;
1440 }
1441
1442 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1443 num_sgs * sizeof(struct scatterlist);
1444 ret = usbfs_increase_memory_usage(u);
1445 if (ret)
1446 goto error;
1447 as->mem_usage = u;
1448
1449 if (num_sgs) {
1450 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1451 GFP_KERNEL);
1452 if (!as->urb->sg) {
1453 ret = -ENOMEM;
1454 goto error;
1455 }
1456 as->urb->num_sgs = num_sgs;
1457 sg_init_table(as->urb->sg, as->urb->num_sgs);
1458
1459 totlen = uurb->buffer_length;
1460 for (i = 0; i < as->urb->num_sgs; i++) {
1461 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1462 buf = kmalloc(u, GFP_KERNEL);
1463 if (!buf) {
1464 ret = -ENOMEM;
1465 goto error;
1466 }
1467 sg_set_buf(&as->urb->sg[i], buf, u);
1468
1469 if (!is_in) {
1470 if (copy_from_user(buf, uurb->buffer, u)) {
1471 ret = -EFAULT;
1472 goto error;
1473 }
1474 uurb->buffer += u;
1475 }
1476 totlen -= u;
1477 }
1478 } else if (uurb->buffer_length > 0) {
1479 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1480 GFP_KERNEL);
1481 if (!as->urb->transfer_buffer) {
1482 ret = -ENOMEM;
1483 goto error;
1484 }
1485
1486 if (!is_in) {
1487 if (copy_from_user(as->urb->transfer_buffer,
1488 uurb->buffer,
1489 uurb->buffer_length)) {
1490 ret = -EFAULT;
1491 goto error;
1492 }
1493 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1494 /*
1495 * Isochronous input data may end up being
1496 * discontiguous if some of the packets are short.
1497 * Clear the buffer so that the gaps don't leak
1498 * kernel data to userspace.
1499 */
1500 memset(as->urb->transfer_buffer, 0,
1501 uurb->buffer_length);
1502 }
1503 }
1504 as->urb->dev = ps->dev;
1505 as->urb->pipe = (uurb->type << 30) |
1506 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1507 (uurb->endpoint & USB_DIR_IN);
1508
1509 /* This tedious sequence is necessary because the URB_* flags
1510 * are internal to the kernel and subject to change, whereas
1511 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1512 */
1513 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1514 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1515 u |= URB_ISO_ASAP;
1516 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK && is_in)
1517 u |= URB_SHORT_NOT_OK;
1518 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1519 u |= URB_NO_FSBR;
1520 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1521 u |= URB_ZERO_PACKET;
1522 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1523 u |= URB_NO_INTERRUPT;
1524 as->urb->transfer_flags = u;
1525
1526 as->urb->transfer_buffer_length = uurb->buffer_length;
1527 as->urb->setup_packet = (unsigned char *)dr;
1528 dr = NULL;
1529 as->urb->start_frame = uurb->start_frame;
1530 as->urb->number_of_packets = number_of_packets;
1531 as->urb->stream_id = stream_id;
1532 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1533 ps->dev->speed == USB_SPEED_HIGH)
1534 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1535 else
1536 as->urb->interval = ep->desc.bInterval;
1537 as->urb->context = as;
1538 as->urb->complete = async_completed;
1539 for (totlen = u = 0; u < number_of_packets; u++) {
1540 as->urb->iso_frame_desc[u].offset = totlen;
1541 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1542 totlen += isopkt[u].length;
1543 }
1544 kfree(isopkt);
1545 isopkt = NULL;
1546 as->ps = ps;
1547 as->userurb = arg;
1548 if (is_in && uurb->buffer_length > 0)
1549 as->userbuffer = uurb->buffer;
1550 else
1551 as->userbuffer = NULL;
1552 as->signr = uurb->signr;
1553 as->ifnum = ifnum;
1554 as->pid = get_pid(task_pid(current));
1555 as->cred = get_current_cred();
1556 security_task_getsecid(current, &as->secid);
1557 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1558 as->urb->transfer_buffer_length, 0, SUBMIT,
1559 NULL, 0);
1560 if (!is_in)
1561 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1562
1563 async_newpending(as);
1564
1565 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1566 spin_lock_irq(&ps->lock);
1567
1568 /* Not exactly the endpoint address; the direction bit is
1569 * shifted to the 0x10 position so that the value will be
1570 * between 0 and 31.
1571 */
1572 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1573 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1574 >> 3);
1575
1576 /* If this bulk URB is the start of a new transfer, re-enable
1577 * the endpoint. Otherwise mark it as a continuation URB.
1578 */
1579 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1580 as->bulk_status = AS_CONTINUATION;
1581 else
1582 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1583
1584 /* Don't accept continuation URBs if the endpoint is
1585 * disabled because of an earlier error.
1586 */
1587 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1588 ret = -EREMOTEIO;
1589 else
1590 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1591 spin_unlock_irq(&ps->lock);
1592 } else {
1593 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1594 }
1595
1596 if (ret) {
1597 dev_printk(KERN_DEBUG, &ps->dev->dev,
1598 "usbfs: usb_submit_urb returned %d\n", ret);
1599 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1600 0, ret, COMPLETE, NULL, 0);
1601 async_removepending(as);
1602 goto error;
1603 }
1604 return 0;
1605
1606 error:
1607 kfree(isopkt);
1608 kfree(dr);
1609 if (as)
1610 free_async(as);
1611 return ret;
1612 }
1613
1614 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1615 {
1616 struct usbdevfs_urb uurb;
1617
1618 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1619 return -EFAULT;
1620
1621 return proc_do_submiturb(ps, &uurb,
1622 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1623 arg);
1624 }
1625
1626 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1627 {
1628 struct urb *urb;
1629 struct async *as;
1630 unsigned long flags;
1631
1632 spin_lock_irqsave(&ps->lock, flags);
1633 as = async_getpending(ps, arg);
1634 if (!as) {
1635 spin_unlock_irqrestore(&ps->lock, flags);
1636 return -EINVAL;
1637 }
1638
1639 urb = as->urb;
1640 usb_get_urb(urb);
1641 spin_unlock_irqrestore(&ps->lock, flags);
1642
1643 usb_kill_urb(urb);
1644 usb_put_urb(urb);
1645
1646 return 0;
1647 }
1648
1649 static int processcompl(struct async *as, void __user * __user *arg)
1650 {
1651 struct urb *urb = as->urb;
1652 struct usbdevfs_urb __user *userurb = as->userurb;
1653 void __user *addr = as->userurb;
1654 unsigned int i;
1655
1656 if (as->userbuffer && urb->actual_length) {
1657 if (copy_urb_data_to_user(as->userbuffer, urb))
1658 goto err_out;
1659 }
1660 if (put_user(as->status, &userurb->status))
1661 goto err_out;
1662 if (put_user(urb->actual_length, &userurb->actual_length))
1663 goto err_out;
1664 if (put_user(urb->error_count, &userurb->error_count))
1665 goto err_out;
1666
1667 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1668 for (i = 0; i < urb->number_of_packets; i++) {
1669 if (put_user(urb->iso_frame_desc[i].actual_length,
1670 &userurb->iso_frame_desc[i].actual_length))
1671 goto err_out;
1672 if (put_user(urb->iso_frame_desc[i].status,
1673 &userurb->iso_frame_desc[i].status))
1674 goto err_out;
1675 }
1676 }
1677
1678 if (put_user(addr, (void __user * __user *)arg))
1679 return -EFAULT;
1680 return 0;
1681
1682 err_out:
1683 return -EFAULT;
1684 }
1685
1686 static struct async *reap_as(struct usb_dev_state *ps)
1687 {
1688 DECLARE_WAITQUEUE(wait, current);
1689 struct async *as = NULL;
1690 struct usb_device *dev = ps->dev;
1691
1692 add_wait_queue(&ps->wait, &wait);
1693 for (;;) {
1694 __set_current_state(TASK_INTERRUPTIBLE);
1695 as = async_getcompleted(ps);
1696 if (as || !connected(ps))
1697 break;
1698 if (signal_pending(current))
1699 break;
1700 usb_unlock_device(dev);
1701 schedule();
1702 usb_lock_device(dev);
1703 }
1704 remove_wait_queue(&ps->wait, &wait);
1705 set_current_state(TASK_RUNNING);
1706 return as;
1707 }
1708
1709 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1710 {
1711 struct async *as = reap_as(ps);
1712 if (as) {
1713 int retval = processcompl(as, (void __user * __user *)arg);
1714 free_async(as);
1715 return retval;
1716 }
1717 if (signal_pending(current))
1718 return -EINTR;
1719 return -ENODEV;
1720 }
1721
1722 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1723 {
1724 int retval;
1725 struct async *as;
1726
1727 as = async_getcompleted(ps);
1728 if (as) {
1729 retval = processcompl(as, (void __user * __user *)arg);
1730 free_async(as);
1731 } else {
1732 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1733 }
1734 return retval;
1735 }
1736
1737 #ifdef CONFIG_COMPAT
1738 static int proc_control_compat(struct usb_dev_state *ps,
1739 struct usbdevfs_ctrltransfer32 __user *p32)
1740 {
1741 struct usbdevfs_ctrltransfer __user *p;
1742 __u32 udata;
1743 p = compat_alloc_user_space(sizeof(*p));
1744 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1745 get_user(udata, &p32->data) ||
1746 put_user(compat_ptr(udata), &p->data))
1747 return -EFAULT;
1748 return proc_control(ps, p);
1749 }
1750
1751 static int proc_bulk_compat(struct usb_dev_state *ps,
1752 struct usbdevfs_bulktransfer32 __user *p32)
1753 {
1754 struct usbdevfs_bulktransfer __user *p;
1755 compat_uint_t n;
1756 compat_caddr_t addr;
1757
1758 p = compat_alloc_user_space(sizeof(*p));
1759
1760 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1761 get_user(n, &p32->len) || put_user(n, &p->len) ||
1762 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1763 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1764 return -EFAULT;
1765
1766 return proc_bulk(ps, p);
1767 }
1768 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1769 {
1770 struct usbdevfs_disconnectsignal32 ds;
1771
1772 if (copy_from_user(&ds, arg, sizeof(ds)))
1773 return -EFAULT;
1774 ps->discsignr = ds.signr;
1775 ps->disccontext = compat_ptr(ds.context);
1776 return 0;
1777 }
1778
1779 static int get_urb32(struct usbdevfs_urb *kurb,
1780 struct usbdevfs_urb32 __user *uurb)
1781 {
1782 __u32 uptr;
1783 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1784 __get_user(kurb->type, &uurb->type) ||
1785 __get_user(kurb->endpoint, &uurb->endpoint) ||
1786 __get_user(kurb->status, &uurb->status) ||
1787 __get_user(kurb->flags, &uurb->flags) ||
1788 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1789 __get_user(kurb->actual_length, &uurb->actual_length) ||
1790 __get_user(kurb->start_frame, &uurb->start_frame) ||
1791 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1792 __get_user(kurb->error_count, &uurb->error_count) ||
1793 __get_user(kurb->signr, &uurb->signr))
1794 return -EFAULT;
1795
1796 if (__get_user(uptr, &uurb->buffer))
1797 return -EFAULT;
1798 kurb->buffer = compat_ptr(uptr);
1799 if (__get_user(uptr, &uurb->usercontext))
1800 return -EFAULT;
1801 kurb->usercontext = compat_ptr(uptr);
1802
1803 return 0;
1804 }
1805
1806 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
1807 {
1808 struct usbdevfs_urb uurb;
1809
1810 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1811 return -EFAULT;
1812
1813 return proc_do_submiturb(ps, &uurb,
1814 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1815 arg);
1816 }
1817
1818 static int processcompl_compat(struct async *as, void __user * __user *arg)
1819 {
1820 struct urb *urb = as->urb;
1821 struct usbdevfs_urb32 __user *userurb = as->userurb;
1822 void __user *addr = as->userurb;
1823 unsigned int i;
1824
1825 if (as->userbuffer && urb->actual_length) {
1826 if (copy_urb_data_to_user(as->userbuffer, urb))
1827 return -EFAULT;
1828 }
1829 if (put_user(as->status, &userurb->status))
1830 return -EFAULT;
1831 if (put_user(urb->actual_length, &userurb->actual_length))
1832 return -EFAULT;
1833 if (put_user(urb->error_count, &userurb->error_count))
1834 return -EFAULT;
1835
1836 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1837 for (i = 0; i < urb->number_of_packets; i++) {
1838 if (put_user(urb->iso_frame_desc[i].actual_length,
1839 &userurb->iso_frame_desc[i].actual_length))
1840 return -EFAULT;
1841 if (put_user(urb->iso_frame_desc[i].status,
1842 &userurb->iso_frame_desc[i].status))
1843 return -EFAULT;
1844 }
1845 }
1846
1847 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1848 return -EFAULT;
1849 return 0;
1850 }
1851
1852 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
1853 {
1854 struct async *as = reap_as(ps);
1855 if (as) {
1856 int retval = processcompl_compat(as, (void __user * __user *)arg);
1857 free_async(as);
1858 return retval;
1859 }
1860 if (signal_pending(current))
1861 return -EINTR;
1862 return -ENODEV;
1863 }
1864
1865 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
1866 {
1867 int retval;
1868 struct async *as;
1869
1870 as = async_getcompleted(ps);
1871 if (as) {
1872 retval = processcompl_compat(as, (void __user * __user *)arg);
1873 free_async(as);
1874 } else {
1875 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1876 }
1877 return retval;
1878 }
1879
1880
1881 #endif
1882
1883 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
1884 {
1885 struct usbdevfs_disconnectsignal ds;
1886
1887 if (copy_from_user(&ds, arg, sizeof(ds)))
1888 return -EFAULT;
1889 ps->discsignr = ds.signr;
1890 ps->disccontext = ds.context;
1891 return 0;
1892 }
1893
1894 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
1895 {
1896 unsigned int ifnum;
1897
1898 if (get_user(ifnum, (unsigned int __user *)arg))
1899 return -EFAULT;
1900 return claimintf(ps, ifnum);
1901 }
1902
1903 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
1904 {
1905 unsigned int ifnum;
1906 int ret;
1907
1908 if (get_user(ifnum, (unsigned int __user *)arg))
1909 return -EFAULT;
1910 ret = releaseintf(ps, ifnum);
1911 if (ret < 0)
1912 return ret;
1913 destroy_async_on_interface (ps, ifnum);
1914 return 0;
1915 }
1916
1917 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
1918 {
1919 int size;
1920 void *buf = NULL;
1921 int retval = 0;
1922 struct usb_interface *intf = NULL;
1923 struct usb_driver *driver = NULL;
1924
1925 /* alloc buffer */
1926 size = _IOC_SIZE(ctl->ioctl_code);
1927 if (size > 0) {
1928 buf = kmalloc(size, GFP_KERNEL);
1929 if (buf == NULL)
1930 return -ENOMEM;
1931 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1932 if (copy_from_user(buf, ctl->data, size)) {
1933 kfree(buf);
1934 return -EFAULT;
1935 }
1936 } else {
1937 memset(buf, 0, size);
1938 }
1939 }
1940
1941 if (!connected(ps)) {
1942 kfree(buf);
1943 return -ENODEV;
1944 }
1945
1946 if (ps->dev->state != USB_STATE_CONFIGURED)
1947 retval = -EHOSTUNREACH;
1948 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1949 retval = -EINVAL;
1950 else switch (ctl->ioctl_code) {
1951
1952 /* disconnect kernel driver from interface */
1953 case USBDEVFS_DISCONNECT:
1954 if (intf->dev.driver) {
1955 driver = to_usb_driver(intf->dev.driver);
1956 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1957 usb_driver_release_interface(driver, intf);
1958 } else
1959 retval = -ENODATA;
1960 break;
1961
1962 /* let kernel drivers try to (re)bind to the interface */
1963 case USBDEVFS_CONNECT:
1964 if (!intf->dev.driver)
1965 retval = device_attach(&intf->dev);
1966 else
1967 retval = -EBUSY;
1968 break;
1969
1970 /* talk directly to the interface's driver */
1971 default:
1972 if (intf->dev.driver)
1973 driver = to_usb_driver(intf->dev.driver);
1974 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1975 retval = -ENOTTY;
1976 } else {
1977 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1978 if (retval == -ENOIOCTLCMD)
1979 retval = -ENOTTY;
1980 }
1981 }
1982
1983 /* cleanup and return */
1984 if (retval >= 0
1985 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1986 && size > 0
1987 && copy_to_user(ctl->data, buf, size) != 0)
1988 retval = -EFAULT;
1989
1990 kfree(buf);
1991 return retval;
1992 }
1993
1994 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
1995 {
1996 struct usbdevfs_ioctl ctrl;
1997
1998 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1999 return -EFAULT;
2000 return proc_ioctl(ps, &ctrl);
2001 }
2002
2003 #ifdef CONFIG_COMPAT
2004 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2005 {
2006 struct usbdevfs_ioctl32 __user *uioc;
2007 struct usbdevfs_ioctl ctrl;
2008 u32 udata;
2009
2010 uioc = compat_ptr((long)arg);
2011 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
2012 __get_user(ctrl.ifno, &uioc->ifno) ||
2013 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
2014 __get_user(udata, &uioc->data))
2015 return -EFAULT;
2016 ctrl.data = compat_ptr(udata);
2017
2018 return proc_ioctl(ps, &ctrl);
2019 }
2020 #endif
2021
2022 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2023 {
2024 unsigned portnum;
2025 int rc;
2026
2027 if (get_user(portnum, (unsigned __user *) arg))
2028 return -EFAULT;
2029 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2030 if (rc == 0)
2031 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2032 portnum, task_pid_nr(current), current->comm);
2033 return rc;
2034 }
2035
2036 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2037 {
2038 unsigned portnum;
2039
2040 if (get_user(portnum, (unsigned __user *) arg))
2041 return -EFAULT;
2042 return usb_hub_release_port(ps->dev, portnum, ps);
2043 }
2044
2045 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2046 {
2047 __u32 caps;
2048
2049 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2050 USBDEVFS_CAP_REAP_AFTER_DISCONNECT;
2051 if (!ps->dev->bus->no_stop_on_short)
2052 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2053 if (ps->dev->bus->sg_tablesize)
2054 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2055
2056 if (put_user(caps, (__u32 __user *)arg))
2057 return -EFAULT;
2058
2059 return 0;
2060 }
2061
2062 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2063 {
2064 struct usbdevfs_disconnect_claim dc;
2065 struct usb_interface *intf;
2066
2067 if (copy_from_user(&dc, arg, sizeof(dc)))
2068 return -EFAULT;
2069
2070 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2071 if (!intf)
2072 return -EINVAL;
2073
2074 if (intf->dev.driver) {
2075 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2076
2077 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2078 strncmp(dc.driver, intf->dev.driver->name,
2079 sizeof(dc.driver)) != 0)
2080 return -EBUSY;
2081
2082 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2083 strncmp(dc.driver, intf->dev.driver->name,
2084 sizeof(dc.driver)) == 0)
2085 return -EBUSY;
2086
2087 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2088 usb_driver_release_interface(driver, intf);
2089 }
2090
2091 return claimintf(ps, dc.interface);
2092 }
2093
2094 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2095 {
2096 unsigned num_streams, num_eps;
2097 struct usb_host_endpoint **eps;
2098 struct usb_interface *intf;
2099 int r;
2100
2101 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2102 &eps, &intf);
2103 if (r)
2104 return r;
2105
2106 destroy_async_on_interface(ps,
2107 intf->altsetting[0].desc.bInterfaceNumber);
2108
2109 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2110 kfree(eps);
2111 return r;
2112 }
2113
2114 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2115 {
2116 unsigned num_eps;
2117 struct usb_host_endpoint **eps;
2118 struct usb_interface *intf;
2119 int r;
2120
2121 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2122 if (r)
2123 return r;
2124
2125 destroy_async_on_interface(ps,
2126 intf->altsetting[0].desc.bInterfaceNumber);
2127
2128 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2129 kfree(eps);
2130 return r;
2131 }
2132
2133 /*
2134 * NOTE: All requests here that have interface numbers as parameters
2135 * are assuming that somehow the configuration has been prevented from
2136 * changing. But there's no mechanism to ensure that...
2137 */
2138 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2139 void __user *p)
2140 {
2141 struct usb_dev_state *ps = file->private_data;
2142 struct inode *inode = file_inode(file);
2143 struct usb_device *dev = ps->dev;
2144 int ret = -ENOTTY;
2145
2146 if (!(file->f_mode & FMODE_WRITE))
2147 return -EPERM;
2148
2149 usb_lock_device(dev);
2150
2151 /* Reap operations are allowed even after disconnection */
2152 switch (cmd) {
2153 case USBDEVFS_REAPURB:
2154 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2155 ret = proc_reapurb(ps, p);
2156 goto done;
2157
2158 case USBDEVFS_REAPURBNDELAY:
2159 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2160 ret = proc_reapurbnonblock(ps, p);
2161 goto done;
2162
2163 #ifdef CONFIG_COMPAT
2164 case USBDEVFS_REAPURB32:
2165 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2166 ret = proc_reapurb_compat(ps, p);
2167 goto done;
2168
2169 case USBDEVFS_REAPURBNDELAY32:
2170 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2171 ret = proc_reapurbnonblock_compat(ps, p);
2172 goto done;
2173 #endif
2174 }
2175
2176 if (!connected(ps)) {
2177 usb_unlock_device(dev);
2178 return -ENODEV;
2179 }
2180
2181 switch (cmd) {
2182 case USBDEVFS_CONTROL:
2183 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2184 ret = proc_control(ps, p);
2185 if (ret >= 0)
2186 inode->i_mtime = CURRENT_TIME;
2187 break;
2188
2189 case USBDEVFS_BULK:
2190 snoop(&dev->dev, "%s: BULK\n", __func__);
2191 ret = proc_bulk(ps, p);
2192 if (ret >= 0)
2193 inode->i_mtime = CURRENT_TIME;
2194 break;
2195
2196 case USBDEVFS_RESETEP:
2197 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2198 ret = proc_resetep(ps, p);
2199 if (ret >= 0)
2200 inode->i_mtime = CURRENT_TIME;
2201 break;
2202
2203 case USBDEVFS_RESET:
2204 snoop(&dev->dev, "%s: RESET\n", __func__);
2205 ret = proc_resetdevice(ps);
2206 break;
2207
2208 case USBDEVFS_CLEAR_HALT:
2209 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2210 ret = proc_clearhalt(ps, p);
2211 if (ret >= 0)
2212 inode->i_mtime = CURRENT_TIME;
2213 break;
2214
2215 case USBDEVFS_GETDRIVER:
2216 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2217 ret = proc_getdriver(ps, p);
2218 break;
2219
2220 case USBDEVFS_CONNECTINFO:
2221 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2222 ret = proc_connectinfo(ps, p);
2223 break;
2224
2225 case USBDEVFS_SETINTERFACE:
2226 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2227 ret = proc_setintf(ps, p);
2228 break;
2229
2230 case USBDEVFS_SETCONFIGURATION:
2231 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2232 ret = proc_setconfig(ps, p);
2233 break;
2234
2235 case USBDEVFS_SUBMITURB:
2236 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2237 ret = proc_submiturb(ps, p);
2238 if (ret >= 0)
2239 inode->i_mtime = CURRENT_TIME;
2240 break;
2241
2242 #ifdef CONFIG_COMPAT
2243 case USBDEVFS_CONTROL32:
2244 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2245 ret = proc_control_compat(ps, p);
2246 if (ret >= 0)
2247 inode->i_mtime = CURRENT_TIME;
2248 break;
2249
2250 case USBDEVFS_BULK32:
2251 snoop(&dev->dev, "%s: BULK32\n", __func__);
2252 ret = proc_bulk_compat(ps, p);
2253 if (ret >= 0)
2254 inode->i_mtime = CURRENT_TIME;
2255 break;
2256
2257 case USBDEVFS_DISCSIGNAL32:
2258 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2259 ret = proc_disconnectsignal_compat(ps, p);
2260 break;
2261
2262 case USBDEVFS_SUBMITURB32:
2263 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2264 ret = proc_submiturb_compat(ps, p);
2265 if (ret >= 0)
2266 inode->i_mtime = CURRENT_TIME;
2267 break;
2268
2269 case USBDEVFS_IOCTL32:
2270 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2271 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2272 break;
2273 #endif
2274
2275 case USBDEVFS_DISCARDURB:
2276 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
2277 ret = proc_unlinkurb(ps, p);
2278 break;
2279
2280 case USBDEVFS_DISCSIGNAL:
2281 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2282 ret = proc_disconnectsignal(ps, p);
2283 break;
2284
2285 case USBDEVFS_CLAIMINTERFACE:
2286 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2287 ret = proc_claiminterface(ps, p);
2288 break;
2289
2290 case USBDEVFS_RELEASEINTERFACE:
2291 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2292 ret = proc_releaseinterface(ps, p);
2293 break;
2294
2295 case USBDEVFS_IOCTL:
2296 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2297 ret = proc_ioctl_default(ps, p);
2298 break;
2299
2300 case USBDEVFS_CLAIM_PORT:
2301 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2302 ret = proc_claim_port(ps, p);
2303 break;
2304
2305 case USBDEVFS_RELEASE_PORT:
2306 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2307 ret = proc_release_port(ps, p);
2308 break;
2309 case USBDEVFS_GET_CAPABILITIES:
2310 ret = proc_get_capabilities(ps, p);
2311 break;
2312 case USBDEVFS_DISCONNECT_CLAIM:
2313 ret = proc_disconnect_claim(ps, p);
2314 break;
2315 case USBDEVFS_ALLOC_STREAMS:
2316 ret = proc_alloc_streams(ps, p);
2317 break;
2318 case USBDEVFS_FREE_STREAMS:
2319 ret = proc_free_streams(ps, p);
2320 break;
2321 }
2322
2323 done:
2324 usb_unlock_device(dev);
2325 if (ret >= 0)
2326 inode->i_atime = CURRENT_TIME;
2327 return ret;
2328 }
2329
2330 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2331 unsigned long arg)
2332 {
2333 int ret;
2334
2335 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2336
2337 return ret;
2338 }
2339
2340 #ifdef CONFIG_COMPAT
2341 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2342 unsigned long arg)
2343 {
2344 int ret;
2345
2346 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2347
2348 return ret;
2349 }
2350 #endif
2351
2352 /* No kernel lock - fine */
2353 static unsigned int usbdev_poll(struct file *file,
2354 struct poll_table_struct *wait)
2355 {
2356 struct usb_dev_state *ps = file->private_data;
2357 unsigned int mask = 0;
2358
2359 poll_wait(file, &ps->wait, wait);
2360 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2361 mask |= POLLOUT | POLLWRNORM;
2362 if (!connected(ps))
2363 mask |= POLLERR | POLLHUP;
2364 return mask;
2365 }
2366
2367 const struct file_operations usbdev_file_operations = {
2368 .owner = THIS_MODULE,
2369 .llseek = usbdev_lseek,
2370 .read = usbdev_read,
2371 .poll = usbdev_poll,
2372 .unlocked_ioctl = usbdev_ioctl,
2373 #ifdef CONFIG_COMPAT
2374 .compat_ioctl = usbdev_compat_ioctl,
2375 #endif
2376 .open = usbdev_open,
2377 .release = usbdev_release,
2378 };
2379
2380 static void usbdev_remove(struct usb_device *udev)
2381 {
2382 struct usb_dev_state *ps;
2383 struct siginfo sinfo;
2384
2385 while (!list_empty(&udev->filelist)) {
2386 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2387 destroy_all_async(ps);
2388 wake_up_all(&ps->wait);
2389 list_del_init(&ps->list);
2390 if (ps->discsignr) {
2391 memset(&sinfo, 0, sizeof(sinfo));
2392 sinfo.si_signo = ps->discsignr;
2393 sinfo.si_errno = EPIPE;
2394 sinfo.si_code = SI_ASYNCIO;
2395 sinfo.si_addr = ps->disccontext;
2396 kill_pid_info_as_cred(ps->discsignr, &sinfo,
2397 ps->disc_pid, ps->cred, ps->secid);
2398 }
2399 }
2400 }
2401
2402 static int usbdev_notify(struct notifier_block *self,
2403 unsigned long action, void *dev)
2404 {
2405 switch (action) {
2406 case USB_DEVICE_ADD:
2407 break;
2408 case USB_DEVICE_REMOVE:
2409 usbdev_remove(dev);
2410 break;
2411 }
2412 return NOTIFY_OK;
2413 }
2414
2415 static struct notifier_block usbdev_nb = {
2416 .notifier_call = usbdev_notify,
2417 };
2418
2419 static struct cdev usb_device_cdev;
2420
2421 int __init usb_devio_init(void)
2422 {
2423 int retval;
2424
2425 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2426 "usb_device");
2427 if (retval) {
2428 printk(KERN_ERR "Unable to register minors for usb_device\n");
2429 goto out;
2430 }
2431 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2432 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2433 if (retval) {
2434 printk(KERN_ERR "Unable to get usb_device major %d\n",
2435 USB_DEVICE_MAJOR);
2436 goto error_cdev;
2437 }
2438 usb_register_notify(&usbdev_nb);
2439 out:
2440 return retval;
2441
2442 error_cdev:
2443 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2444 goto out;
2445 }
2446
2447 void usb_devio_cleanup(void)
2448 {
2449 usb_unregister_notify(&usbdev_nb);
2450 cdev_del(&usb_device_cdev);
2451 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2452 }
Linux with added FPC-III support