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Merge tag 'v3.10.85' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.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 <asm/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 aithmetic 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 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 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 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 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 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 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 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 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 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, where wIndex is (interface << 8 | altsetting)
730 * instead of just interface
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 index >>= 8;
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 int match_devt(struct device *dev, void *data)
774 {
775 return dev->devt == (dev_t) (unsigned long) data;
776 }
777
778 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
779 {
780 struct device *dev;
781
782 dev = bus_find_device(&usb_bus_type, NULL,
783 (void *) (unsigned long) devt, match_devt);
784 if (!dev)
785 return NULL;
786 return container_of(dev, struct usb_device, dev);
787 }
788
789 /*
790 * file operations
791 */
792 static int usbdev_open(struct inode *inode, struct file *file)
793 {
794 struct usb_device *dev = NULL;
795 struct dev_state *ps;
796 int ret;
797
798 ret = -ENOMEM;
799 ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
800 if (!ps)
801 goto out_free_ps;
802
803 ret = -ENODEV;
804
805 /* Protect against simultaneous removal or release */
806 mutex_lock(&usbfs_mutex);
807
808 /* usbdev device-node */
809 if (imajor(inode) == USB_DEVICE_MAJOR)
810 dev = usbdev_lookup_by_devt(inode->i_rdev);
811
812 mutex_unlock(&usbfs_mutex);
813
814 if (!dev)
815 goto out_free_ps;
816
817 usb_lock_device(dev);
818 if (dev->state == USB_STATE_NOTATTACHED)
819 goto out_unlock_device;
820
821 ret = usb_autoresume_device(dev);
822 if (ret)
823 goto out_unlock_device;
824
825 ps->dev = dev;
826 ps->file = file;
827 spin_lock_init(&ps->lock);
828 INIT_LIST_HEAD(&ps->list);
829 INIT_LIST_HEAD(&ps->async_pending);
830 INIT_LIST_HEAD(&ps->async_completed);
831 init_waitqueue_head(&ps->wait);
832 ps->discsignr = 0;
833 ps->disc_pid = get_pid(task_pid(current));
834 ps->cred = get_current_cred();
835 ps->disccontext = NULL;
836 ps->ifclaimed = 0;
837 security_task_getsecid(current, &ps->secid);
838 smp_wmb();
839 list_add_tail(&ps->list, &dev->filelist);
840 file->private_data = ps;
841 usb_unlock_device(dev);
842 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
843 current->comm);
844
845 MYDBG("opened by process %d: %s\n", task_pid_nr(current),
846 current->comm);
847
848 return ret;
849
850 out_unlock_device:
851 usb_unlock_device(dev);
852 usb_put_dev(dev);
853 out_free_ps:
854 kfree(ps);
855 return ret;
856 }
857
858 static int usbdev_release(struct inode *inode, struct file *file)
859 {
860 struct dev_state *ps = file->private_data;
861 struct usb_device *dev = ps->dev;
862 unsigned int ifnum;
863 struct async *as;
864
865 usb_lock_device(dev);
866 usb_hub_release_all_ports(dev, ps);
867
868 list_del_init(&ps->list);
869
870 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
871 ifnum++) {
872 if (test_bit(ifnum, &ps->ifclaimed))
873 releaseintf(ps, ifnum);
874 }
875 destroy_all_async(ps);
876 usb_autosuspend_device(dev);
877 usb_unlock_device(dev);
878 usb_put_dev(dev);
879 put_pid(ps->disc_pid);
880 put_cred(ps->cred);
881
882 as = async_getcompleted(ps);
883 while (as) {
884 free_async(as);
885 as = async_getcompleted(ps);
886 }
887 kfree(ps);
888 return 0;
889 }
890
891 static int proc_control(struct dev_state *ps, void __user *arg)
892 {
893 struct usb_device *dev = ps->dev;
894 struct usbdevfs_ctrltransfer ctrl;
895 unsigned int tmo;
896 unsigned char *tbuf;
897 unsigned wLength;
898 int i, pipe, ret;
899
900 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
901 return -EFAULT;
902 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
903 ctrl.wIndex);
904 if (ret)
905 return ret;
906 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
907 if (wLength > PAGE_SIZE)
908 return -EINVAL;
909 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
910 sizeof(struct usb_ctrlrequest));
911 if (ret)
912 return ret;
913 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
914 if (!tbuf) {
915 ret = -ENOMEM;
916 goto done;
917 }
918 tmo = ctrl.timeout;
919 snoop(&dev->dev, "control urb: bRequestType=%02x "
920 "bRequest=%02x wValue=%04x "
921 "wIndex=%04x wLength=%04x\n",
922 ctrl.bRequestType, ctrl.bRequest,
923 __le16_to_cpup(&ctrl.wValue),
924 __le16_to_cpup(&ctrl.wIndex),
925 __le16_to_cpup(&ctrl.wLength));
926 if (ctrl.bRequestType & 0x80) {
927 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
928 ctrl.wLength)) {
929 ret = -EINVAL;
930 goto done;
931 }
932 pipe = usb_rcvctrlpipe(dev, 0);
933 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
934
935 usb_unlock_device(dev);
936 i = usb_control_msg(dev, pipe, ctrl.bRequest,
937 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
938 tbuf, ctrl.wLength, tmo);
939 usb_lock_device(dev);
940 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
941 tbuf, max(i, 0));
942 if ((i > 0) && ctrl.wLength) {
943 if (copy_to_user(ctrl.data, tbuf, i)) {
944 ret = -EFAULT;
945 goto done;
946 }
947 }
948 } else {
949 if (ctrl.wLength) {
950 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
951 ret = -EFAULT;
952 goto done;
953 }
954 }
955 pipe = usb_sndctrlpipe(dev, 0);
956 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
957 tbuf, ctrl.wLength);
958
959 usb_unlock_device(dev);
960 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
961 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
962 tbuf, ctrl.wLength, tmo);
963 usb_lock_device(dev);
964 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
965 }
966 if (i < 0 && i != -EPIPE) {
967 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
968 "failed cmd %s rqt %u rq %u len %u ret %d\n",
969 current->comm, ctrl.bRequestType, ctrl.bRequest,
970 ctrl.wLength, i);
971 }
972 ret = i;
973 done:
974 free_page((unsigned long) tbuf);
975 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
976 sizeof(struct usb_ctrlrequest));
977 return ret;
978 }
979
980 static int proc_bulk(struct dev_state *ps, void __user *arg)
981 {
982 struct usb_device *dev = ps->dev;
983 struct usbdevfs_bulktransfer bulk;
984 unsigned int tmo, len1, pipe;
985 int len2;
986 unsigned char *tbuf;
987 int i, ret;
988
989 if (copy_from_user(&bulk, arg, sizeof(bulk)))
990 return -EFAULT;
991 ret = findintfep(ps->dev, bulk.ep);
992 if (ret < 0)
993 return ret;
994 ret = checkintf(ps, ret);
995 if (ret)
996 return ret;
997 if (bulk.ep & USB_DIR_IN)
998 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
999 else
1000 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1001 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1002 return -EINVAL;
1003 len1 = bulk.len;
1004 if (len1 >= USBFS_XFER_MAX)
1005 return -EINVAL;
1006 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1007 if (ret)
1008 return ret;
1009 if (!(tbuf = kmalloc(len1, GFP_KERNEL))) {
1010 ret = -ENOMEM;
1011 goto done;
1012 }
1013 tmo = bulk.timeout;
1014 if (bulk.ep & 0x80) {
1015 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1016 ret = -EINVAL;
1017 goto done;
1018 }
1019 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1020
1021 usb_unlock_device(dev);
1022 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1023 usb_lock_device(dev);
1024 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1025
1026 if (!i && len2) {
1027 if (copy_to_user(bulk.data, tbuf, len2)) {
1028 ret = -EFAULT;
1029 goto done;
1030 }
1031 }
1032 } else {
1033 if (len1) {
1034 if (copy_from_user(tbuf, bulk.data, len1)) {
1035 ret = -EFAULT;
1036 goto done;
1037 }
1038 }
1039 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1040
1041 usb_unlock_device(dev);
1042 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1043 usb_lock_device(dev);
1044 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1045 }
1046 ret = (i < 0 ? i : len2);
1047 done:
1048 kfree(tbuf);
1049 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1050 return ret;
1051 }
1052
1053 static int proc_resetep(struct dev_state *ps, void __user *arg)
1054 {
1055 unsigned int ep;
1056 int ret;
1057
1058 if (get_user(ep, (unsigned int __user *)arg))
1059 return -EFAULT;
1060 ret = findintfep(ps->dev, ep);
1061 if (ret < 0)
1062 return ret;
1063 ret = checkintf(ps, ret);
1064 if (ret)
1065 return ret;
1066 usb_reset_endpoint(ps->dev, ep);
1067 return 0;
1068 }
1069
1070 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
1071 {
1072 unsigned int ep;
1073 int pipe;
1074 int ret;
1075
1076 if (get_user(ep, (unsigned int __user *)arg))
1077 return -EFAULT;
1078 ret = findintfep(ps->dev, ep);
1079 if (ret < 0)
1080 return ret;
1081 ret = checkintf(ps, ret);
1082 if (ret)
1083 return ret;
1084 if (ep & USB_DIR_IN)
1085 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1086 else
1087 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1088
1089 return usb_clear_halt(ps->dev, pipe);
1090 }
1091
1092 static int proc_getdriver(struct dev_state *ps, void __user *arg)
1093 {
1094 struct usbdevfs_getdriver gd;
1095 struct usb_interface *intf;
1096 int ret;
1097
1098 if (copy_from_user(&gd, arg, sizeof(gd)))
1099 return -EFAULT;
1100 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1101 if (!intf || !intf->dev.driver)
1102 ret = -ENODATA;
1103 else {
1104 strlcpy(gd.driver, intf->dev.driver->name,
1105 sizeof(gd.driver));
1106 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1107 }
1108 return ret;
1109 }
1110
1111 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
1112 {
1113 struct usbdevfs_connectinfo ci;
1114
1115 memset(&ci, 0, sizeof(ci));
1116 ci.devnum = ps->dev->devnum;
1117 ci.slow = ps->dev->speed == USB_SPEED_LOW;
1118
1119 if (copy_to_user(arg, &ci, sizeof(ci)))
1120 return -EFAULT;
1121 return 0;
1122 }
1123
1124 static int proc_resetdevice(struct dev_state *ps)
1125 {
1126 return usb_reset_device(ps->dev);
1127 }
1128
1129 static int proc_setintf(struct dev_state *ps, void __user *arg)
1130 {
1131 struct usbdevfs_setinterface setintf;
1132 int ret;
1133
1134 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1135 return -EFAULT;
1136 if ((ret = checkintf(ps, setintf.interface)))
1137 return ret;
1138 return usb_set_interface(ps->dev, setintf.interface,
1139 setintf.altsetting);
1140 }
1141
1142 static int proc_setconfig(struct dev_state *ps, void __user *arg)
1143 {
1144 int u;
1145 int status = 0;
1146 struct usb_host_config *actconfig;
1147
1148 if (get_user(u, (int __user *)arg))
1149 return -EFAULT;
1150
1151 actconfig = ps->dev->actconfig;
1152
1153 /* Don't touch the device if any interfaces are claimed.
1154 * It could interfere with other drivers' operations, and if
1155 * an interface is claimed by usbfs it could easily deadlock.
1156 */
1157 if (actconfig) {
1158 int i;
1159
1160 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1161 if (usb_interface_claimed(actconfig->interface[i])) {
1162 dev_warn(&ps->dev->dev,
1163 "usbfs: interface %d claimed by %s "
1164 "while '%s' sets config #%d\n",
1165 actconfig->interface[i]
1166 ->cur_altsetting
1167 ->desc.bInterfaceNumber,
1168 actconfig->interface[i]
1169 ->dev.driver->name,
1170 current->comm, u);
1171 status = -EBUSY;
1172 break;
1173 }
1174 }
1175 }
1176
1177 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1178 * so avoid usb_set_configuration()'s kick to sysfs
1179 */
1180 if (status == 0) {
1181 if (actconfig && actconfig->desc.bConfigurationValue == u)
1182 status = usb_reset_configuration(ps->dev);
1183 else
1184 status = usb_set_configuration(ps->dev, u);
1185 }
1186
1187 return status;
1188 }
1189
1190 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1191 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1192 void __user *arg)
1193 {
1194 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1195 struct usb_host_endpoint *ep;
1196 struct async *as = NULL;
1197 struct usb_ctrlrequest *dr = NULL;
1198 unsigned int u, totlen, isofrmlen;
1199 int i, ret, is_in, num_sgs = 0, ifnum = -1;
1200 void *buf;
1201
1202 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1203 USBDEVFS_URB_SHORT_NOT_OK |
1204 USBDEVFS_URB_BULK_CONTINUATION |
1205 USBDEVFS_URB_NO_FSBR |
1206 USBDEVFS_URB_ZERO_PACKET |
1207 USBDEVFS_URB_NO_INTERRUPT))
1208 return -EINVAL;
1209 if (uurb->buffer_length > 0 && !uurb->buffer)
1210 return -EINVAL;
1211 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1212 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1213 ifnum = findintfep(ps->dev, uurb->endpoint);
1214 if (ifnum < 0)
1215 return ifnum;
1216 ret = checkintf(ps, ifnum);
1217 if (ret)
1218 return ret;
1219 }
1220 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1221 is_in = 1;
1222 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1223 } else {
1224 is_in = 0;
1225 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1226 }
1227 if (!ep)
1228 return -ENOENT;
1229
1230 u = 0;
1231 switch(uurb->type) {
1232 case USBDEVFS_URB_TYPE_CONTROL:
1233 if (!usb_endpoint_xfer_control(&ep->desc))
1234 return -EINVAL;
1235 /* min 8 byte setup packet */
1236 if (uurb->buffer_length < 8)
1237 return -EINVAL;
1238 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1239 if (!dr)
1240 return -ENOMEM;
1241 if (copy_from_user(dr, uurb->buffer, 8)) {
1242 ret = -EFAULT;
1243 goto error;
1244 }
1245 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1246 ret = -EINVAL;
1247 goto error;
1248 }
1249 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1250 le16_to_cpup(&dr->wIndex));
1251 if (ret)
1252 goto error;
1253 uurb->number_of_packets = 0;
1254 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1255 uurb->buffer += 8;
1256 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1257 is_in = 1;
1258 uurb->endpoint |= USB_DIR_IN;
1259 } else {
1260 is_in = 0;
1261 uurb->endpoint &= ~USB_DIR_IN;
1262 }
1263 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1264 "bRequest=%02x wValue=%04x "
1265 "wIndex=%04x wLength=%04x\n",
1266 dr->bRequestType, dr->bRequest,
1267 __le16_to_cpup(&dr->wValue),
1268 __le16_to_cpup(&dr->wIndex),
1269 __le16_to_cpup(&dr->wLength));
1270 u = sizeof(struct usb_ctrlrequest);
1271 break;
1272
1273 case USBDEVFS_URB_TYPE_BULK:
1274 switch (usb_endpoint_type(&ep->desc)) {
1275 case USB_ENDPOINT_XFER_CONTROL:
1276 case USB_ENDPOINT_XFER_ISOC:
1277 return -EINVAL;
1278 case USB_ENDPOINT_XFER_INT:
1279 /* allow single-shot interrupt transfers */
1280 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1281 goto interrupt_urb;
1282 }
1283 uurb->number_of_packets = 0;
1284 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1285 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1286 num_sgs = 0;
1287 break;
1288
1289 case USBDEVFS_URB_TYPE_INTERRUPT:
1290 if (!usb_endpoint_xfer_int(&ep->desc))
1291 return -EINVAL;
1292 interrupt_urb:
1293 uurb->number_of_packets = 0;
1294 break;
1295
1296 case USBDEVFS_URB_TYPE_ISO:
1297 /* arbitrary limit */
1298 if (uurb->number_of_packets < 1 ||
1299 uurb->number_of_packets > 128)
1300 return -EINVAL;
1301 if (!usb_endpoint_xfer_isoc(&ep->desc))
1302 return -EINVAL;
1303 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1304 uurb->number_of_packets;
1305 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1306 return -ENOMEM;
1307 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1308 ret = -EFAULT;
1309 goto error;
1310 }
1311 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1312 /*
1313 * arbitrary limit need for USB 3.0
1314 * bMaxBurst (0~15 allowed, 1~16 packets)
1315 * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1316 * sizemax: 1024 * 16 * 3 = 49152
1317 */
1318 if (isopkt[u].length > 49152) {
1319 ret = -EINVAL;
1320 goto error;
1321 }
1322 totlen += isopkt[u].length;
1323 }
1324 u *= sizeof(struct usb_iso_packet_descriptor);
1325 uurb->buffer_length = totlen;
1326 break;
1327
1328 default:
1329 return -EINVAL;
1330 }
1331
1332 if (uurb->buffer_length >= USBFS_XFER_MAX) {
1333 ret = -EINVAL;
1334 goto error;
1335 }
1336 if (uurb->buffer_length > 0 &&
1337 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1338 uurb->buffer, uurb->buffer_length)) {
1339 ret = -EFAULT;
1340 goto error;
1341 }
1342 as = alloc_async(uurb->number_of_packets);
1343 if (!as) {
1344 ret = -ENOMEM;
1345 goto error;
1346 }
1347
1348 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1349 num_sgs * sizeof(struct scatterlist);
1350 ret = usbfs_increase_memory_usage(u);
1351 if (ret)
1352 goto error;
1353 as->mem_usage = u;
1354
1355 if (num_sgs) {
1356 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1357 GFP_KERNEL);
1358 if (!as->urb->sg) {
1359 ret = -ENOMEM;
1360 goto error;
1361 }
1362 as->urb->num_sgs = num_sgs;
1363 sg_init_table(as->urb->sg, as->urb->num_sgs);
1364
1365 totlen = uurb->buffer_length;
1366 for (i = 0; i < as->urb->num_sgs; i++) {
1367 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1368 buf = kmalloc(u, GFP_KERNEL);
1369 if (!buf) {
1370 ret = -ENOMEM;
1371 goto error;
1372 }
1373 sg_set_buf(&as->urb->sg[i], buf, u);
1374
1375 if (!is_in) {
1376 if (copy_from_user(buf, uurb->buffer, u)) {
1377 ret = -EFAULT;
1378 goto error;
1379 }
1380 uurb->buffer += u;
1381 }
1382 totlen -= u;
1383 }
1384 } else if (uurb->buffer_length > 0) {
1385 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1386 GFP_KERNEL);
1387 if (!as->urb->transfer_buffer) {
1388 ret = -ENOMEM;
1389 goto error;
1390 }
1391
1392 if (!is_in) {
1393 if (copy_from_user(as->urb->transfer_buffer,
1394 uurb->buffer,
1395 uurb->buffer_length)) {
1396 ret = -EFAULT;
1397 goto error;
1398 }
1399 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1400 /*
1401 * Isochronous input data may end up being
1402 * discontiguous if some of the packets are short.
1403 * Clear the buffer so that the gaps don't leak
1404 * kernel data to userspace.
1405 */
1406 memset(as->urb->transfer_buffer, 0,
1407 uurb->buffer_length);
1408 }
1409 }
1410 as->urb->dev = ps->dev;
1411 as->urb->pipe = (uurb->type << 30) |
1412 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1413 (uurb->endpoint & USB_DIR_IN);
1414
1415 /* This tedious sequence is necessary because the URB_* flags
1416 * are internal to the kernel and subject to change, whereas
1417 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1418 */
1419 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1420 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1421 u |= URB_ISO_ASAP;
1422 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1423 u |= URB_SHORT_NOT_OK;
1424 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1425 u |= URB_NO_FSBR;
1426 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1427 u |= URB_ZERO_PACKET;
1428 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1429 u |= URB_NO_INTERRUPT;
1430 as->urb->transfer_flags = u;
1431
1432 as->urb->transfer_buffer_length = uurb->buffer_length;
1433 as->urb->setup_packet = (unsigned char *)dr;
1434 dr = NULL;
1435 as->urb->start_frame = uurb->start_frame;
1436 as->urb->number_of_packets = uurb->number_of_packets;
1437 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1438 ps->dev->speed == USB_SPEED_HIGH)
1439 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1440 else
1441 as->urb->interval = ep->desc.bInterval;
1442 as->urb->context = as;
1443 as->urb->complete = async_completed;
1444 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1445 as->urb->iso_frame_desc[u].offset = totlen;
1446 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1447 totlen += isopkt[u].length;
1448 }
1449 kfree(isopkt);
1450 isopkt = NULL;
1451 as->ps = ps;
1452 as->userurb = arg;
1453 if (is_in && uurb->buffer_length > 0)
1454 as->userbuffer = uurb->buffer;
1455 else
1456 as->userbuffer = NULL;
1457 as->signr = uurb->signr;
1458 as->ifnum = ifnum;
1459 as->pid = get_pid(task_pid(current));
1460 as->cred = get_current_cred();
1461 security_task_getsecid(current, &as->secid);
1462 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1463 as->urb->transfer_buffer_length, 0, SUBMIT,
1464 NULL, 0);
1465 if (!is_in)
1466 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1467
1468 async_newpending(as);
1469
1470 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1471 spin_lock_irq(&ps->lock);
1472
1473 /* Not exactly the endpoint address; the direction bit is
1474 * shifted to the 0x10 position so that the value will be
1475 * between 0 and 31.
1476 */
1477 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1478 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1479 >> 3);
1480
1481 /* If this bulk URB is the start of a new transfer, re-enable
1482 * the endpoint. Otherwise mark it as a continuation URB.
1483 */
1484 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1485 as->bulk_status = AS_CONTINUATION;
1486 else
1487 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1488
1489 /* Don't accept continuation URBs if the endpoint is
1490 * disabled because of an earlier error.
1491 */
1492 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1493 ret = -EREMOTEIO;
1494 else
1495 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1496 spin_unlock_irq(&ps->lock);
1497 } else {
1498 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1499 }
1500
1501 if (ret) {
1502 dev_printk(KERN_DEBUG, &ps->dev->dev,
1503 "usbfs: usb_submit_urb returned %d\n", ret);
1504 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1505 0, ret, COMPLETE, NULL, 0);
1506 async_removepending(as);
1507 goto error;
1508 }
1509 return 0;
1510
1511 error:
1512 kfree(isopkt);
1513 kfree(dr);
1514 if (as)
1515 free_async(as);
1516 return ret;
1517 }
1518
1519 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1520 {
1521 struct usbdevfs_urb uurb;
1522
1523 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1524 return -EFAULT;
1525
1526 return proc_do_submiturb(ps, &uurb,
1527 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1528 arg);
1529 }
1530
1531 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1532 {
1533 struct urb *urb;
1534 struct async *as;
1535 unsigned long flags;
1536
1537 spin_lock_irqsave(&ps->lock, flags);
1538 as = async_getpending(ps, arg);
1539 if (!as) {
1540 spin_unlock_irqrestore(&ps->lock, flags);
1541 return -EINVAL;
1542 }
1543
1544 urb = as->urb;
1545 usb_get_urb(urb);
1546 spin_unlock_irqrestore(&ps->lock, flags);
1547
1548 usb_kill_urb(urb);
1549 usb_put_urb(urb);
1550
1551 return 0;
1552 }
1553
1554 static int processcompl(struct async *as, void __user * __user *arg)
1555 {
1556 struct urb *urb = as->urb;
1557 struct usbdevfs_urb __user *userurb = as->userurb;
1558 void __user *addr = as->userurb;
1559 unsigned int i;
1560
1561 if (as->userbuffer && urb->actual_length) {
1562 if (copy_urb_data_to_user(as->userbuffer, urb))
1563 goto err_out;
1564 }
1565 if (put_user(as->status, &userurb->status))
1566 goto err_out;
1567 if (put_user(urb->actual_length, &userurb->actual_length))
1568 goto err_out;
1569 if (put_user(urb->error_count, &userurb->error_count))
1570 goto err_out;
1571
1572 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1573 for (i = 0; i < urb->number_of_packets; i++) {
1574 if (put_user(urb->iso_frame_desc[i].actual_length,
1575 &userurb->iso_frame_desc[i].actual_length))
1576 goto err_out;
1577 if (put_user(urb->iso_frame_desc[i].status,
1578 &userurb->iso_frame_desc[i].status))
1579 goto err_out;
1580 }
1581 }
1582
1583 if (put_user(addr, (void __user * __user *)arg))
1584 return -EFAULT;
1585 return 0;
1586
1587 err_out:
1588 return -EFAULT;
1589 }
1590
1591 static struct async *reap_as(struct dev_state *ps)
1592 {
1593 DECLARE_WAITQUEUE(wait, current);
1594 struct async *as = NULL;
1595 struct usb_device *dev = ps->dev;
1596
1597 add_wait_queue(&ps->wait, &wait);
1598 for (;;) {
1599 __set_current_state(TASK_INTERRUPTIBLE);
1600 as = async_getcompleted(ps);
1601 if (as || !connected(ps))
1602 break;
1603 if (signal_pending(current))
1604 break;
1605 usb_unlock_device(dev);
1606 schedule();
1607 usb_lock_device(dev);
1608 }
1609 remove_wait_queue(&ps->wait, &wait);
1610 set_current_state(TASK_RUNNING);
1611 return as;
1612 }
1613
1614 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1615 {
1616 struct async *as = reap_as(ps);
1617 if (as) {
1618 int retval = processcompl(as, (void __user * __user *)arg);
1619 free_async(as);
1620 return retval;
1621 }
1622 if (signal_pending(current))
1623 return -EINTR;
1624 return -ENODEV;
1625 }
1626
1627 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1628 {
1629 int retval;
1630 struct async *as;
1631
1632 as = async_getcompleted(ps);
1633 if (as) {
1634 retval = processcompl(as, (void __user * __user *)arg);
1635 free_async(as);
1636 } else {
1637 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1638 }
1639 return retval;
1640 }
1641
1642 #ifdef CONFIG_COMPAT
1643 static int proc_control_compat(struct dev_state *ps,
1644 struct usbdevfs_ctrltransfer32 __user *p32)
1645 {
1646 struct usbdevfs_ctrltransfer __user *p;
1647 __u32 udata;
1648 p = compat_alloc_user_space(sizeof(*p));
1649 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1650 get_user(udata, &p32->data) ||
1651 put_user(compat_ptr(udata), &p->data))
1652 return -EFAULT;
1653 return proc_control(ps, p);
1654 }
1655
1656 static int proc_bulk_compat(struct dev_state *ps,
1657 struct usbdevfs_bulktransfer32 __user *p32)
1658 {
1659 struct usbdevfs_bulktransfer __user *p;
1660 compat_uint_t n;
1661 compat_caddr_t addr;
1662
1663 p = compat_alloc_user_space(sizeof(*p));
1664
1665 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1666 get_user(n, &p32->len) || put_user(n, &p->len) ||
1667 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1668 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1669 return -EFAULT;
1670
1671 return proc_bulk(ps, p);
1672 }
1673 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1674 {
1675 struct usbdevfs_disconnectsignal32 ds;
1676
1677 if (copy_from_user(&ds, arg, sizeof(ds)))
1678 return -EFAULT;
1679 ps->discsignr = ds.signr;
1680 ps->disccontext = compat_ptr(ds.context);
1681 return 0;
1682 }
1683
1684 static int get_urb32(struct usbdevfs_urb *kurb,
1685 struct usbdevfs_urb32 __user *uurb)
1686 {
1687 __u32 uptr;
1688 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1689 __get_user(kurb->type, &uurb->type) ||
1690 __get_user(kurb->endpoint, &uurb->endpoint) ||
1691 __get_user(kurb->status, &uurb->status) ||
1692 __get_user(kurb->flags, &uurb->flags) ||
1693 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1694 __get_user(kurb->actual_length, &uurb->actual_length) ||
1695 __get_user(kurb->start_frame, &uurb->start_frame) ||
1696 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1697 __get_user(kurb->error_count, &uurb->error_count) ||
1698 __get_user(kurb->signr, &uurb->signr))
1699 return -EFAULT;
1700
1701 if (__get_user(uptr, &uurb->buffer))
1702 return -EFAULT;
1703 kurb->buffer = compat_ptr(uptr);
1704 if (__get_user(uptr, &uurb->usercontext))
1705 return -EFAULT;
1706 kurb->usercontext = compat_ptr(uptr);
1707
1708 return 0;
1709 }
1710
1711 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1712 {
1713 struct usbdevfs_urb uurb;
1714
1715 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1716 return -EFAULT;
1717
1718 return proc_do_submiturb(ps, &uurb,
1719 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1720 arg);
1721 }
1722
1723 static int processcompl_compat(struct async *as, void __user * __user *arg)
1724 {
1725 struct urb *urb = as->urb;
1726 struct usbdevfs_urb32 __user *userurb = as->userurb;
1727 void __user *addr = as->userurb;
1728 unsigned int i;
1729
1730 if (as->userbuffer && urb->actual_length) {
1731 if (copy_urb_data_to_user(as->userbuffer, urb))
1732 return -EFAULT;
1733 }
1734 if (put_user(as->status, &userurb->status))
1735 return -EFAULT;
1736 if (put_user(urb->actual_length, &userurb->actual_length))
1737 return -EFAULT;
1738 if (put_user(urb->error_count, &userurb->error_count))
1739 return -EFAULT;
1740
1741 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1742 for (i = 0; i < urb->number_of_packets; i++) {
1743 if (put_user(urb->iso_frame_desc[i].actual_length,
1744 &userurb->iso_frame_desc[i].actual_length))
1745 return -EFAULT;
1746 if (put_user(urb->iso_frame_desc[i].status,
1747 &userurb->iso_frame_desc[i].status))
1748 return -EFAULT;
1749 }
1750 }
1751
1752 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1753 return -EFAULT;
1754 return 0;
1755 }
1756
1757 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1758 {
1759 struct async *as = reap_as(ps);
1760 if (as) {
1761 int retval = processcompl_compat(as, (void __user * __user *)arg);
1762 free_async(as);
1763 return retval;
1764 }
1765 if (signal_pending(current))
1766 return -EINTR;
1767 return -ENODEV;
1768 }
1769
1770 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1771 {
1772 int retval;
1773 struct async *as;
1774
1775 as = async_getcompleted(ps);
1776 if (as) {
1777 retval = processcompl_compat(as, (void __user * __user *)arg);
1778 free_async(as);
1779 } else {
1780 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1781 }
1782 return retval;
1783 }
1784
1785
1786 #endif
1787
1788 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1789 {
1790 struct usbdevfs_disconnectsignal ds;
1791
1792 if (copy_from_user(&ds, arg, sizeof(ds)))
1793 return -EFAULT;
1794 ps->discsignr = ds.signr;
1795 ps->disccontext = ds.context;
1796 return 0;
1797 }
1798
1799 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1800 {
1801 unsigned int ifnum;
1802
1803 if (get_user(ifnum, (unsigned int __user *)arg))
1804 return -EFAULT;
1805 return claimintf(ps, ifnum);
1806 }
1807
1808 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1809 {
1810 unsigned int ifnum;
1811 int ret;
1812
1813 if (get_user(ifnum, (unsigned int __user *)arg))
1814 return -EFAULT;
1815 if ((ret = releaseintf(ps, ifnum)) < 0)
1816 return ret;
1817 destroy_async_on_interface (ps, ifnum);
1818 return 0;
1819 }
1820
1821 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1822 {
1823 int size;
1824 void *buf = NULL;
1825 int retval = 0;
1826 struct usb_interface *intf = NULL;
1827 struct usb_driver *driver = NULL;
1828
1829 /* alloc buffer */
1830 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1831 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1832 return -ENOMEM;
1833 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1834 if (copy_from_user(buf, ctl->data, size)) {
1835 kfree(buf);
1836 return -EFAULT;
1837 }
1838 } else {
1839 memset(buf, 0, size);
1840 }
1841 }
1842
1843 if (!connected(ps)) {
1844 kfree(buf);
1845 return -ENODEV;
1846 }
1847
1848 if (ps->dev->state != USB_STATE_CONFIGURED)
1849 retval = -EHOSTUNREACH;
1850 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1851 retval = -EINVAL;
1852 else switch (ctl->ioctl_code) {
1853
1854 /* disconnect kernel driver from interface */
1855 case USBDEVFS_DISCONNECT:
1856 if (intf->dev.driver) {
1857 driver = to_usb_driver(intf->dev.driver);
1858 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1859 usb_driver_release_interface(driver, intf);
1860 } else
1861 retval = -ENODATA;
1862 break;
1863
1864 /* let kernel drivers try to (re)bind to the interface */
1865 case USBDEVFS_CONNECT:
1866 if (!intf->dev.driver)
1867 retval = device_attach(&intf->dev);
1868 else
1869 retval = -EBUSY;
1870 break;
1871
1872 /* talk directly to the interface's driver */
1873 default:
1874 if (intf->dev.driver)
1875 driver = to_usb_driver(intf->dev.driver);
1876 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1877 retval = -ENOTTY;
1878 } else {
1879 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1880 if (retval == -ENOIOCTLCMD)
1881 retval = -ENOTTY;
1882 }
1883 }
1884
1885 /* cleanup and return */
1886 if (retval >= 0
1887 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1888 && size > 0
1889 && copy_to_user(ctl->data, buf, size) != 0)
1890 retval = -EFAULT;
1891
1892 kfree(buf);
1893 return retval;
1894 }
1895
1896 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1897 {
1898 struct usbdevfs_ioctl ctrl;
1899
1900 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1901 return -EFAULT;
1902 return proc_ioctl(ps, &ctrl);
1903 }
1904
1905 #ifdef CONFIG_COMPAT
1906 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1907 {
1908 struct usbdevfs_ioctl32 __user *uioc;
1909 struct usbdevfs_ioctl ctrl;
1910 u32 udata;
1911
1912 uioc = compat_ptr((long)arg);
1913 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1914 __get_user(ctrl.ifno, &uioc->ifno) ||
1915 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1916 __get_user(udata, &uioc->data))
1917 return -EFAULT;
1918 ctrl.data = compat_ptr(udata);
1919
1920 return proc_ioctl(ps, &ctrl);
1921 }
1922 #endif
1923
1924 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1925 {
1926 unsigned portnum;
1927 int rc;
1928
1929 if (get_user(portnum, (unsigned __user *) arg))
1930 return -EFAULT;
1931 rc = usb_hub_claim_port(ps->dev, portnum, ps);
1932 if (rc == 0)
1933 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1934 portnum, task_pid_nr(current), current->comm);
1935 return rc;
1936 }
1937
1938 static int proc_release_port(struct dev_state *ps, void __user *arg)
1939 {
1940 unsigned portnum;
1941
1942 if (get_user(portnum, (unsigned __user *) arg))
1943 return -EFAULT;
1944 return usb_hub_release_port(ps->dev, portnum, ps);
1945 }
1946
1947 static int proc_get_capabilities(struct dev_state *ps, void __user *arg)
1948 {
1949 __u32 caps;
1950
1951 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
1952 USBDEVFS_CAP_REAP_AFTER_DISCONNECT;
1953 if (!ps->dev->bus->no_stop_on_short)
1954 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
1955 if (ps->dev->bus->sg_tablesize)
1956 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
1957
1958 if (put_user(caps, (__u32 __user *)arg))
1959 return -EFAULT;
1960
1961 return 0;
1962 }
1963
1964 static int proc_disconnect_claim(struct dev_state *ps, void __user *arg)
1965 {
1966 struct usbdevfs_disconnect_claim dc;
1967 struct usb_interface *intf;
1968
1969 if (copy_from_user(&dc, arg, sizeof(dc)))
1970 return -EFAULT;
1971
1972 intf = usb_ifnum_to_if(ps->dev, dc.interface);
1973 if (!intf)
1974 return -EINVAL;
1975
1976 if (intf->dev.driver) {
1977 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
1978
1979 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
1980 strncmp(dc.driver, intf->dev.driver->name,
1981 sizeof(dc.driver)) != 0)
1982 return -EBUSY;
1983
1984 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
1985 strncmp(dc.driver, intf->dev.driver->name,
1986 sizeof(dc.driver)) == 0)
1987 return -EBUSY;
1988
1989 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1990 usb_driver_release_interface(driver, intf);
1991 }
1992
1993 return claimintf(ps, dc.interface);
1994 }
1995
1996 /*
1997 * NOTE: All requests here that have interface numbers as parameters
1998 * are assuming that somehow the configuration has been prevented from
1999 * changing. But there's no mechanism to ensure that...
2000 */
2001 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2002 void __user *p)
2003 {
2004 struct dev_state *ps = file->private_data;
2005 struct inode *inode = file_inode(file);
2006 struct usb_device *dev = ps->dev;
2007 int ret = -ENOTTY;
2008
2009 if (!(file->f_mode & FMODE_WRITE))
2010 return -EPERM;
2011
2012 usb_lock_device(dev);
2013
2014 /* Reap operations are allowed even after disconnection */
2015 switch (cmd) {
2016 case USBDEVFS_REAPURB:
2017 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2018 ret = proc_reapurb(ps, p);
2019 goto done;
2020
2021 case USBDEVFS_REAPURBNDELAY:
2022 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2023 ret = proc_reapurbnonblock(ps, p);
2024 goto done;
2025
2026 #ifdef CONFIG_COMPAT
2027 case USBDEVFS_REAPURB32:
2028 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2029 ret = proc_reapurb_compat(ps, p);
2030 goto done;
2031
2032 case USBDEVFS_REAPURBNDELAY32:
2033 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2034 ret = proc_reapurbnonblock_compat(ps, p);
2035 goto done;
2036 #endif
2037 }
2038
2039 if (!connected(ps)) {
2040 usb_unlock_device(dev);
2041 return -ENODEV;
2042 }
2043
2044 switch (cmd) {
2045 case USBDEVFS_CONTROL:
2046 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2047 ret = proc_control(ps, p);
2048 if (ret >= 0)
2049 inode->i_mtime = CURRENT_TIME;
2050 break;
2051
2052 case USBDEVFS_BULK:
2053 snoop(&dev->dev, "%s: BULK\n", __func__);
2054 ret = proc_bulk(ps, p);
2055 if (ret >= 0)
2056 inode->i_mtime = CURRENT_TIME;
2057 break;
2058
2059 case USBDEVFS_RESETEP:
2060 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2061 ret = proc_resetep(ps, p);
2062 if (ret >= 0)
2063 inode->i_mtime = CURRENT_TIME;
2064 break;
2065
2066 case USBDEVFS_RESET:
2067 snoop(&dev->dev, "%s: RESET\n", __func__);
2068 ret = proc_resetdevice(ps);
2069 break;
2070
2071 case USBDEVFS_CLEAR_HALT:
2072 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2073 ret = proc_clearhalt(ps, p);
2074 if (ret >= 0)
2075 inode->i_mtime = CURRENT_TIME;
2076 break;
2077
2078 case USBDEVFS_GETDRIVER:
2079 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2080 ret = proc_getdriver(ps, p);
2081 break;
2082
2083 case USBDEVFS_CONNECTINFO:
2084 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2085 ret = proc_connectinfo(ps, p);
2086 break;
2087
2088 case USBDEVFS_SETINTERFACE:
2089 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2090 ret = proc_setintf(ps, p);
2091 break;
2092
2093 case USBDEVFS_SETCONFIGURATION:
2094 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2095 ret = proc_setconfig(ps, p);
2096 break;
2097
2098 case USBDEVFS_SUBMITURB:
2099 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2100 ret = proc_submiturb(ps, p);
2101 if (ret >= 0)
2102 inode->i_mtime = CURRENT_TIME;
2103 break;
2104
2105 #ifdef CONFIG_COMPAT
2106 case USBDEVFS_CONTROL32:
2107 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2108 ret = proc_control_compat(ps, p);
2109 if (ret >= 0)
2110 inode->i_mtime = CURRENT_TIME;
2111 break;
2112
2113 case USBDEVFS_BULK32:
2114 snoop(&dev->dev, "%s: BULK32\n", __func__);
2115 ret = proc_bulk_compat(ps, p);
2116 if (ret >= 0)
2117 inode->i_mtime = CURRENT_TIME;
2118 break;
2119
2120 case USBDEVFS_DISCSIGNAL32:
2121 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2122 ret = proc_disconnectsignal_compat(ps, p);
2123 break;
2124
2125 case USBDEVFS_SUBMITURB32:
2126 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2127 ret = proc_submiturb_compat(ps, p);
2128 if (ret >= 0)
2129 inode->i_mtime = CURRENT_TIME;
2130 break;
2131
2132 case USBDEVFS_IOCTL32:
2133 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2134 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2135 break;
2136 #endif
2137
2138 case USBDEVFS_DISCARDURB:
2139 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
2140 ret = proc_unlinkurb(ps, p);
2141 break;
2142
2143 case USBDEVFS_DISCSIGNAL:
2144 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2145 ret = proc_disconnectsignal(ps, p);
2146 break;
2147
2148 case USBDEVFS_CLAIMINTERFACE:
2149 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2150 ret = proc_claiminterface(ps, p);
2151 break;
2152
2153 case USBDEVFS_RELEASEINTERFACE:
2154 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2155 ret = proc_releaseinterface(ps, p);
2156 break;
2157
2158 case USBDEVFS_IOCTL:
2159 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2160 ret = proc_ioctl_default(ps, p);
2161 break;
2162
2163 case USBDEVFS_CLAIM_PORT:
2164 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2165 ret = proc_claim_port(ps, p);
2166 break;
2167
2168 case USBDEVFS_RELEASE_PORT:
2169 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2170 ret = proc_release_port(ps, p);
2171 break;
2172 case USBDEVFS_GET_CAPABILITIES:
2173 ret = proc_get_capabilities(ps, p);
2174 break;
2175 case USBDEVFS_DISCONNECT_CLAIM:
2176 ret = proc_disconnect_claim(ps, p);
2177 break;
2178 }
2179
2180 done:
2181 usb_unlock_device(dev);
2182 if (ret >= 0)
2183 inode->i_atime = CURRENT_TIME;
2184 return ret;
2185 }
2186
2187 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2188 unsigned long arg)
2189 {
2190 int ret;
2191
2192 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2193
2194 return ret;
2195 }
2196
2197 #ifdef CONFIG_COMPAT
2198 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2199 unsigned long arg)
2200 {
2201 int ret;
2202
2203 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2204
2205 return ret;
2206 }
2207 #endif
2208
2209 /* No kernel lock - fine */
2210 static unsigned int usbdev_poll(struct file *file,
2211 struct poll_table_struct *wait)
2212 {
2213 struct dev_state *ps = file->private_data;
2214 unsigned int mask = 0;
2215
2216 poll_wait(file, &ps->wait, wait);
2217 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2218 mask |= POLLOUT | POLLWRNORM;
2219 if (!connected(ps))
2220 mask |= POLLERR | POLLHUP;
2221 return mask;
2222 }
2223
2224 const struct file_operations usbdev_file_operations = {
2225 .owner = THIS_MODULE,
2226 .llseek = usbdev_lseek,
2227 .read = usbdev_read,
2228 .poll = usbdev_poll,
2229 .unlocked_ioctl = usbdev_ioctl,
2230 #ifdef CONFIG_COMPAT
2231 .compat_ioctl = usbdev_compat_ioctl,
2232 #endif
2233 .open = usbdev_open,
2234 .release = usbdev_release,
2235 };
2236
2237 static void usbdev_remove(struct usb_device *udev)
2238 {
2239 struct dev_state *ps;
2240 struct siginfo sinfo;
2241
2242 while (!list_empty(&udev->filelist)) {
2243 ps = list_entry(udev->filelist.next, struct dev_state, list);
2244 destroy_all_async(ps);
2245 wake_up_all(&ps->wait);
2246 list_del_init(&ps->list);
2247 if (ps->discsignr) {
2248 memset(&sinfo, 0, sizeof(sinfo));
2249 sinfo.si_signo = ps->discsignr;
2250 sinfo.si_errno = EPIPE;
2251 sinfo.si_code = SI_ASYNCIO;
2252 sinfo.si_addr = ps->disccontext;
2253 kill_pid_info_as_cred(ps->discsignr, &sinfo,
2254 ps->disc_pid, ps->cred, ps->secid);
2255 }
2256 }
2257 }
2258
2259 static int usbdev_notify(struct notifier_block *self,
2260 unsigned long action, void *dev)
2261 {
2262 switch (action) {
2263 case USB_DEVICE_ADD:
2264 break;
2265 case USB_DEVICE_REMOVE:
2266 usbdev_remove(dev);
2267 break;
2268 }
2269 return NOTIFY_OK;
2270 }
2271
2272 static struct notifier_block usbdev_nb = {
2273 .notifier_call = usbdev_notify,
2274 };
2275
2276 static struct cdev usb_device_cdev;
2277
2278 int __init usb_devio_init(void)
2279 {
2280 int retval;
2281
2282 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2283 "usb_device");
2284 if (retval) {
2285 printk(KERN_ERR "Unable to register minors for usb_device\n");
2286 goto out;
2287 }
2288 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2289 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2290 if (retval) {
2291 printk(KERN_ERR "Unable to get usb_device major %d\n",
2292 USB_DEVICE_MAJOR);
2293 goto error_cdev;
2294 }
2295 usb_register_notify(&usbdev_nb);
2296 out:
2297 return retval;
2298
2299 error_cdev:
2300 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2301 goto out;
2302 }
2303
2304 void usb_devio_cleanup(void)
2305 {
2306 usb_unregister_notify(&usbdev_nb);
2307 cdev_del(&usb_device_cdev);
2308 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2309 }
kernel source for telekom puls (alcatel/mediatek)