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import PULS_20180308
[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 sinfo.si_signo = as->signr;
505 sinfo.si_errno = as->status;
506 sinfo.si_code = SI_ASYNCIO;
507 sinfo.si_addr = as->userurb;
508 pid = get_pid(as->pid);
509 cred = get_cred(as->cred);
510 secid = as->secid;
511 }
512 snoop(&urb->dev->dev, "urb complete\n");
513 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
514 as->status, COMPLETE, NULL, 0);
515 if ((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_IN)
516 snoop_urb_data(urb, urb->actual_length);
517
518 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
519 as->status != -ENOENT)
520 cancel_bulk_urbs(ps, as->bulk_addr);
521 spin_unlock(&ps->lock);
522
523 if (signr) {
524 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
525 put_pid(pid);
526 put_cred(cred);
527 }
528
529 wake_up(&ps->wait);
530 }
531
532 static void destroy_async(struct dev_state *ps, struct list_head *list)
533 {
534 struct urb *urb;
535 struct async *as;
536 unsigned long flags;
537
538 spin_lock_irqsave(&ps->lock, flags);
539 while (!list_empty(list)) {
540 as = list_entry(list->next, struct async, asynclist);
541 list_del_init(&as->asynclist);
542 urb = as->urb;
543 usb_get_urb(urb);
544
545 /* drop the spinlock so the completion handler can run */
546 spin_unlock_irqrestore(&ps->lock, flags);
547 usb_kill_urb(urb);
548 usb_put_urb(urb);
549 spin_lock_irqsave(&ps->lock, flags);
550 }
551 spin_unlock_irqrestore(&ps->lock, flags);
552 }
553
554 static void destroy_async_on_interface(struct dev_state *ps,
555 unsigned int ifnum)
556 {
557 struct list_head *p, *q, hitlist;
558 unsigned long flags;
559
560 INIT_LIST_HEAD(&hitlist);
561 spin_lock_irqsave(&ps->lock, flags);
562 list_for_each_safe(p, q, &ps->async_pending)
563 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
564 list_move_tail(p, &hitlist);
565 spin_unlock_irqrestore(&ps->lock, flags);
566 destroy_async(ps, &hitlist);
567 }
568
569 static void destroy_all_async(struct dev_state *ps)
570 {
571 destroy_async(ps, &ps->async_pending);
572 }
573
574 /*
575 * interface claims are made only at the request of user level code,
576 * which can also release them (explicitly or by closing files).
577 * they're also undone when devices disconnect.
578 */
579
580 static int driver_probe(struct usb_interface *intf,
581 const struct usb_device_id *id)
582 {
583 return -ENODEV;
584 }
585
586 static void driver_disconnect(struct usb_interface *intf)
587 {
588 struct dev_state *ps = usb_get_intfdata(intf);
589 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
590
591 if (!ps)
592 return;
593
594 /* NOTE: this relies on usbcore having canceled and completed
595 * all pending I/O requests; 2.6 does that.
596 */
597
598 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
599 clear_bit(ifnum, &ps->ifclaimed);
600 else
601 dev_warn(&intf->dev, "interface number %u out of range\n",
602 ifnum);
603
604 usb_set_intfdata(intf, NULL);
605
606 /* force async requests to complete */
607 destroy_async_on_interface(ps, ifnum);
608 }
609
610 /* The following routines are merely placeholders. There is no way
611 * to inform a user task about suspend or resumes.
612 */
613 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
614 {
615 return 0;
616 }
617
618 static int driver_resume(struct usb_interface *intf)
619 {
620 return 0;
621 }
622
623 struct usb_driver usbfs_driver = {
624 .name = "usbfs",
625 .probe = driver_probe,
626 .disconnect = driver_disconnect,
627 .suspend = driver_suspend,
628 .resume = driver_resume,
629 };
630
631 static int claimintf(struct dev_state *ps, unsigned int ifnum)
632 {
633 struct usb_device *dev = ps->dev;
634 struct usb_interface *intf;
635 int err;
636
637 if (ifnum >= 8*sizeof(ps->ifclaimed))
638 return -EINVAL;
639 /* already claimed */
640 if (test_bit(ifnum, &ps->ifclaimed))
641 return 0;
642
643 intf = usb_ifnum_to_if(dev, ifnum);
644 if (!intf)
645 err = -ENOENT;
646 else
647 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
648 if (err == 0)
649 set_bit(ifnum, &ps->ifclaimed);
650 return err;
651 }
652
653 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
654 {
655 struct usb_device *dev;
656 struct usb_interface *intf;
657 int err;
658
659 err = -EINVAL;
660 if (ifnum >= 8*sizeof(ps->ifclaimed))
661 return err;
662 dev = ps->dev;
663 intf = usb_ifnum_to_if(dev, ifnum);
664 if (!intf)
665 err = -ENOENT;
666 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
667 usb_driver_release_interface(&usbfs_driver, intf);
668 err = 0;
669 }
670 return err;
671 }
672
673 static int checkintf(struct dev_state *ps, unsigned int ifnum)
674 {
675 if (ps->dev->state != USB_STATE_CONFIGURED)
676 return -EHOSTUNREACH;
677 if (ifnum >= 8*sizeof(ps->ifclaimed))
678 return -EINVAL;
679 if (test_bit(ifnum, &ps->ifclaimed))
680 return 0;
681 /* if not yet claimed, claim it for the driver */
682 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
683 "interface %u before use\n", task_pid_nr(current),
684 current->comm, ifnum);
685 return claimintf(ps, ifnum);
686 }
687
688 static int findintfep(struct usb_device *dev, unsigned int ep)
689 {
690 unsigned int i, j, e;
691 struct usb_interface *intf;
692 struct usb_host_interface *alts;
693 struct usb_endpoint_descriptor *endpt;
694
695 if (ep & ~(USB_DIR_IN|0xf))
696 return -EINVAL;
697 if (!dev->actconfig)
698 return -ESRCH;
699 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
700 intf = dev->actconfig->interface[i];
701 for (j = 0; j < intf->num_altsetting; j++) {
702 alts = &intf->altsetting[j];
703 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
704 endpt = &alts->endpoint[e].desc;
705 if (endpt->bEndpointAddress == ep)
706 return alts->desc.bInterfaceNumber;
707 }
708 }
709 }
710 return -ENOENT;
711 }
712
713 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
714 unsigned int request, unsigned int index)
715 {
716 int ret = 0;
717 struct usb_host_interface *alt_setting;
718
719 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
720 && ps->dev->state != USB_STATE_ADDRESS
721 && ps->dev->state != USB_STATE_CONFIGURED)
722 return -EHOSTUNREACH;
723 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
724 return 0;
725
726 /*
727 * check for the special corner case 'get_device_id' in the printer
728 * class specification, where wIndex is (interface << 8 | altsetting)
729 * instead of just interface
730 */
731 if (requesttype == 0xa1 && request == 0) {
732 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
733 index >> 8, index & 0xff);
734 if (alt_setting
735 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
736 index >>= 8;
737 }
738
739 index &= 0xff;
740 switch (requesttype & USB_RECIP_MASK) {
741 case USB_RECIP_ENDPOINT:
742 if ((index & ~USB_DIR_IN) == 0)
743 return 0;
744 ret = findintfep(ps->dev, index);
745 if (ret < 0) {
746 /*
747 * Some not fully compliant Win apps seem to get
748 * index wrong and have the endpoint number here
749 * rather than the endpoint address (with the
750 * correct direction). Win does let this through,
751 * so we'll not reject it here but leave it to
752 * the device to not break KVM. But we warn.
753 */
754 ret = findintfep(ps->dev, index ^ 0x80);
755 if (ret >= 0)
756 dev_info(&ps->dev->dev,
757 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
758 __func__, task_pid_nr(current),
759 current->comm, index, index ^ 0x80);
760 }
761 if (ret >= 0)
762 ret = checkintf(ps, ret);
763 break;
764
765 case USB_RECIP_INTERFACE:
766 ret = checkintf(ps, index);
767 break;
768 }
769 return ret;
770 }
771
772 static int match_devt(struct device *dev, void *data)
773 {
774 return dev->devt == (dev_t) (unsigned long) data;
775 }
776
777 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
778 {
779 struct device *dev;
780
781 dev = bus_find_device(&usb_bus_type, NULL,
782 (void *) (unsigned long) devt, match_devt);
783 if (!dev)
784 return NULL;
785 return container_of(dev, struct usb_device, dev);
786 }
787
788 /*
789 * file operations
790 */
791 static int usbdev_open(struct inode *inode, struct file *file)
792 {
793 struct usb_device *dev = NULL;
794 struct dev_state *ps;
795 int ret;
796
797 ret = -ENOMEM;
798 ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
799 if (!ps)
800 goto out_free_ps;
801
802 ret = -ENODEV;
803
804 /* Protect against simultaneous removal or release */
805 mutex_lock(&usbfs_mutex);
806
807 /* usbdev device-node */
808 if (imajor(inode) == USB_DEVICE_MAJOR)
809 dev = usbdev_lookup_by_devt(inode->i_rdev);
810
811 mutex_unlock(&usbfs_mutex);
812
813 if (!dev)
814 goto out_free_ps;
815
816 usb_lock_device(dev);
817 if (dev->state == USB_STATE_NOTATTACHED)
818 goto out_unlock_device;
819
820 ret = usb_autoresume_device(dev);
821 if (ret)
822 goto out_unlock_device;
823
824 ps->dev = dev;
825 ps->file = file;
826 spin_lock_init(&ps->lock);
827 INIT_LIST_HEAD(&ps->list);
828 INIT_LIST_HEAD(&ps->async_pending);
829 INIT_LIST_HEAD(&ps->async_completed);
830 init_waitqueue_head(&ps->wait);
831 ps->discsignr = 0;
832 ps->disc_pid = get_pid(task_pid(current));
833 ps->cred = get_current_cred();
834 ps->disccontext = NULL;
835 ps->ifclaimed = 0;
836 security_task_getsecid(current, &ps->secid);
837 smp_wmb();
838 list_add_tail(&ps->list, &dev->filelist);
839 file->private_data = ps;
840 usb_unlock_device(dev);
841 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
842 current->comm);
843
844 MYDBG("opened by process %d: %s\n", task_pid_nr(current),
845 current->comm);
846
847 return ret;
848
849 out_unlock_device:
850 usb_unlock_device(dev);
851 usb_put_dev(dev);
852 out_free_ps:
853 kfree(ps);
854 return ret;
855 }
856
857 static int usbdev_release(struct inode *inode, struct file *file)
858 {
859 struct dev_state *ps = file->private_data;
860 struct usb_device *dev = ps->dev;
861 unsigned int ifnum;
862 struct async *as;
863
864 usb_lock_device(dev);
865 usb_hub_release_all_ports(dev, ps);
866
867 list_del_init(&ps->list);
868
869 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
870 ifnum++) {
871 if (test_bit(ifnum, &ps->ifclaimed))
872 releaseintf(ps, ifnum);
873 }
874 destroy_all_async(ps);
875 usb_autosuspend_device(dev);
876 usb_unlock_device(dev);
877 usb_put_dev(dev);
878 put_pid(ps->disc_pid);
879 put_cred(ps->cred);
880
881 as = async_getcompleted(ps);
882 while (as) {
883 free_async(as);
884 as = async_getcompleted(ps);
885 }
886 kfree(ps);
887 return 0;
888 }
889
890 static int proc_control(struct dev_state *ps, void __user *arg)
891 {
892 struct usb_device *dev = ps->dev;
893 struct usbdevfs_ctrltransfer ctrl;
894 unsigned int tmo;
895 unsigned char *tbuf;
896 unsigned wLength;
897 int i, pipe, ret;
898
899 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
900 return -EFAULT;
901 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
902 ctrl.wIndex);
903 if (ret)
904 return ret;
905 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
906 if (wLength > PAGE_SIZE)
907 return -EINVAL;
908 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
909 sizeof(struct usb_ctrlrequest));
910 if (ret)
911 return ret;
912 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
913 if (!tbuf) {
914 ret = -ENOMEM;
915 goto done;
916 }
917 tmo = ctrl.timeout;
918 snoop(&dev->dev, "control urb: bRequestType=%02x "
919 "bRequest=%02x wValue=%04x "
920 "wIndex=%04x wLength=%04x\n",
921 ctrl.bRequestType, ctrl.bRequest,
922 __le16_to_cpup(&ctrl.wValue),
923 __le16_to_cpup(&ctrl.wIndex),
924 __le16_to_cpup(&ctrl.wLength));
925 if (ctrl.bRequestType & 0x80) {
926 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
927 ctrl.wLength)) {
928 ret = -EINVAL;
929 goto done;
930 }
931 pipe = usb_rcvctrlpipe(dev, 0);
932 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
933
934 usb_unlock_device(dev);
935 i = usb_control_msg(dev, pipe, ctrl.bRequest,
936 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
937 tbuf, ctrl.wLength, tmo);
938 usb_lock_device(dev);
939 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
940 tbuf, max(i, 0));
941 if ((i > 0) && ctrl.wLength) {
942 if (copy_to_user(ctrl.data, tbuf, i)) {
943 ret = -EFAULT;
944 goto done;
945 }
946 }
947 } else {
948 if (ctrl.wLength) {
949 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
950 ret = -EFAULT;
951 goto done;
952 }
953 }
954 pipe = usb_sndctrlpipe(dev, 0);
955 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
956 tbuf, ctrl.wLength);
957
958 usb_unlock_device(dev);
959 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
960 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
961 tbuf, ctrl.wLength, tmo);
962 usb_lock_device(dev);
963 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
964 }
965 if (i < 0 && i != -EPIPE) {
966 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
967 "failed cmd %s rqt %u rq %u len %u ret %d\n",
968 current->comm, ctrl.bRequestType, ctrl.bRequest,
969 ctrl.wLength, i);
970 }
971 ret = i;
972 done:
973 free_page((unsigned long) tbuf);
974 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
975 sizeof(struct usb_ctrlrequest));
976 return ret;
977 }
978
979 static int proc_bulk(struct dev_state *ps, void __user *arg)
980 {
981 struct usb_device *dev = ps->dev;
982 struct usbdevfs_bulktransfer bulk;
983 unsigned int tmo, len1, pipe;
984 int len2;
985 unsigned char *tbuf;
986 int i, ret;
987
988 if (copy_from_user(&bulk, arg, sizeof(bulk)))
989 return -EFAULT;
990 ret = findintfep(ps->dev, bulk.ep);
991 if (ret < 0)
992 return ret;
993 ret = checkintf(ps, ret);
994 if (ret)
995 return ret;
996 if (bulk.ep & USB_DIR_IN)
997 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
998 else
999 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1000 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1001 return -EINVAL;
1002 len1 = bulk.len;
1003 if (len1 >= USBFS_XFER_MAX)
1004 return -EINVAL;
1005 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1006 if (ret)
1007 return ret;
1008 if (!(tbuf = kmalloc(len1, GFP_KERNEL))) {
1009 ret = -ENOMEM;
1010 goto done;
1011 }
1012 tmo = bulk.timeout;
1013 if (bulk.ep & 0x80) {
1014 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1015 ret = -EINVAL;
1016 goto done;
1017 }
1018 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1019
1020 usb_unlock_device(dev);
1021 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1022 usb_lock_device(dev);
1023 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1024
1025 if (!i && len2) {
1026 if (copy_to_user(bulk.data, tbuf, len2)) {
1027 ret = -EFAULT;
1028 goto done;
1029 }
1030 }
1031 } else {
1032 if (len1) {
1033 if (copy_from_user(tbuf, bulk.data, len1)) {
1034 ret = -EFAULT;
1035 goto done;
1036 }
1037 }
1038 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1039
1040 usb_unlock_device(dev);
1041 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1042 usb_lock_device(dev);
1043 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1044 }
1045 ret = (i < 0 ? i : len2);
1046 done:
1047 kfree(tbuf);
1048 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1049 return ret;
1050 }
1051
1052 static int proc_resetep(struct dev_state *ps, void __user *arg)
1053 {
1054 unsigned int ep;
1055 int ret;
1056
1057 if (get_user(ep, (unsigned int __user *)arg))
1058 return -EFAULT;
1059 ret = findintfep(ps->dev, ep);
1060 if (ret < 0)
1061 return ret;
1062 ret = checkintf(ps, ret);
1063 if (ret)
1064 return ret;
1065 usb_reset_endpoint(ps->dev, ep);
1066 return 0;
1067 }
1068
1069 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
1070 {
1071 unsigned int ep;
1072 int pipe;
1073 int ret;
1074
1075 if (get_user(ep, (unsigned int __user *)arg))
1076 return -EFAULT;
1077 ret = findintfep(ps->dev, ep);
1078 if (ret < 0)
1079 return ret;
1080 ret = checkintf(ps, ret);
1081 if (ret)
1082 return ret;
1083 if (ep & USB_DIR_IN)
1084 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1085 else
1086 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1087
1088 return usb_clear_halt(ps->dev, pipe);
1089 }
1090
1091 static int proc_getdriver(struct dev_state *ps, void __user *arg)
1092 {
1093 struct usbdevfs_getdriver gd;
1094 struct usb_interface *intf;
1095 int ret;
1096
1097 if (copy_from_user(&gd, arg, sizeof(gd)))
1098 return -EFAULT;
1099 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1100 if (!intf || !intf->dev.driver)
1101 ret = -ENODATA;
1102 else {
1103 strlcpy(gd.driver, intf->dev.driver->name,
1104 sizeof(gd.driver));
1105 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1106 }
1107 return ret;
1108 }
1109
1110 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
1111 {
1112 struct usbdevfs_connectinfo ci;
1113
1114 memset(&ci, 0, sizeof(ci));
1115 ci.devnum = ps->dev->devnum;
1116 ci.slow = ps->dev->speed == USB_SPEED_LOW;
1117
1118 if (copy_to_user(arg, &ci, sizeof(ci)))
1119 return -EFAULT;
1120 return 0;
1121 }
1122
1123 static int proc_resetdevice(struct dev_state *ps)
1124 {
1125 return usb_reset_device(ps->dev);
1126 }
1127
1128 static int proc_setintf(struct dev_state *ps, void __user *arg)
1129 {
1130 struct usbdevfs_setinterface setintf;
1131 int ret;
1132
1133 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1134 return -EFAULT;
1135 if ((ret = checkintf(ps, setintf.interface)))
1136 return ret;
1137 return usb_set_interface(ps->dev, setintf.interface,
1138 setintf.altsetting);
1139 }
1140
1141 static int proc_setconfig(struct dev_state *ps, void __user *arg)
1142 {
1143 int u;
1144 int status = 0;
1145 struct usb_host_config *actconfig;
1146
1147 if (get_user(u, (int __user *)arg))
1148 return -EFAULT;
1149
1150 actconfig = ps->dev->actconfig;
1151
1152 /* Don't touch the device if any interfaces are claimed.
1153 * It could interfere with other drivers' operations, and if
1154 * an interface is claimed by usbfs it could easily deadlock.
1155 */
1156 if (actconfig) {
1157 int i;
1158
1159 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1160 if (usb_interface_claimed(actconfig->interface[i])) {
1161 dev_warn(&ps->dev->dev,
1162 "usbfs: interface %d claimed by %s "
1163 "while '%s' sets config #%d\n",
1164 actconfig->interface[i]
1165 ->cur_altsetting
1166 ->desc.bInterfaceNumber,
1167 actconfig->interface[i]
1168 ->dev.driver->name,
1169 current->comm, u);
1170 status = -EBUSY;
1171 break;
1172 }
1173 }
1174 }
1175
1176 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1177 * so avoid usb_set_configuration()'s kick to sysfs
1178 */
1179 if (status == 0) {
1180 if (actconfig && actconfig->desc.bConfigurationValue == u)
1181 status = usb_reset_configuration(ps->dev);
1182 else
1183 status = usb_set_configuration(ps->dev, u);
1184 }
1185
1186 return status;
1187 }
1188
1189 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1190 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1191 void __user *arg)
1192 {
1193 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1194 struct usb_host_endpoint *ep;
1195 struct async *as = NULL;
1196 struct usb_ctrlrequest *dr = NULL;
1197 unsigned int u, totlen, isofrmlen;
1198 int i, ret, is_in, num_sgs = 0, ifnum = -1;
1199 void *buf;
1200
1201 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1202 USBDEVFS_URB_SHORT_NOT_OK |
1203 USBDEVFS_URB_BULK_CONTINUATION |
1204 USBDEVFS_URB_NO_FSBR |
1205 USBDEVFS_URB_ZERO_PACKET |
1206 USBDEVFS_URB_NO_INTERRUPT))
1207 return -EINVAL;
1208 if (uurb->buffer_length > 0 && !uurb->buffer)
1209 return -EINVAL;
1210 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1211 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1212 ifnum = findintfep(ps->dev, uurb->endpoint);
1213 if (ifnum < 0)
1214 return ifnum;
1215 ret = checkintf(ps, ifnum);
1216 if (ret)
1217 return ret;
1218 }
1219 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1220 is_in = 1;
1221 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1222 } else {
1223 is_in = 0;
1224 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1225 }
1226 if (!ep)
1227 return -ENOENT;
1228
1229 u = 0;
1230 switch(uurb->type) {
1231 case USBDEVFS_URB_TYPE_CONTROL:
1232 if (!usb_endpoint_xfer_control(&ep->desc))
1233 return -EINVAL;
1234 /* min 8 byte setup packet */
1235 if (uurb->buffer_length < 8)
1236 return -EINVAL;
1237 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1238 if (!dr)
1239 return -ENOMEM;
1240 if (copy_from_user(dr, uurb->buffer, 8)) {
1241 ret = -EFAULT;
1242 goto error;
1243 }
1244 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1245 ret = -EINVAL;
1246 goto error;
1247 }
1248 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1249 le16_to_cpup(&dr->wIndex));
1250 if (ret)
1251 goto error;
1252 uurb->number_of_packets = 0;
1253 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1254 uurb->buffer += 8;
1255 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1256 is_in = 1;
1257 uurb->endpoint |= USB_DIR_IN;
1258 } else {
1259 is_in = 0;
1260 uurb->endpoint &= ~USB_DIR_IN;
1261 }
1262 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1263 "bRequest=%02x wValue=%04x "
1264 "wIndex=%04x wLength=%04x\n",
1265 dr->bRequestType, dr->bRequest,
1266 __le16_to_cpup(&dr->wValue),
1267 __le16_to_cpup(&dr->wIndex),
1268 __le16_to_cpup(&dr->wLength));
1269 u = sizeof(struct usb_ctrlrequest);
1270 break;
1271
1272 case USBDEVFS_URB_TYPE_BULK:
1273 switch (usb_endpoint_type(&ep->desc)) {
1274 case USB_ENDPOINT_XFER_CONTROL:
1275 case USB_ENDPOINT_XFER_ISOC:
1276 return -EINVAL;
1277 case USB_ENDPOINT_XFER_INT:
1278 /* allow single-shot interrupt transfers */
1279 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1280 goto interrupt_urb;
1281 }
1282 uurb->number_of_packets = 0;
1283 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1284 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1285 num_sgs = 0;
1286 break;
1287
1288 case USBDEVFS_URB_TYPE_INTERRUPT:
1289 if (!usb_endpoint_xfer_int(&ep->desc))
1290 return -EINVAL;
1291 interrupt_urb:
1292 uurb->number_of_packets = 0;
1293 break;
1294
1295 case USBDEVFS_URB_TYPE_ISO:
1296 /* arbitrary limit */
1297 if (uurb->number_of_packets < 1 ||
1298 uurb->number_of_packets > 128)
1299 return -EINVAL;
1300 if (!usb_endpoint_xfer_isoc(&ep->desc))
1301 return -EINVAL;
1302 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1303 uurb->number_of_packets;
1304 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1305 return -ENOMEM;
1306 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1307 ret = -EFAULT;
1308 goto error;
1309 }
1310 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1311 /*
1312 * arbitrary limit need for USB 3.0
1313 * bMaxBurst (0~15 allowed, 1~16 packets)
1314 * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1315 * sizemax: 1024 * 16 * 3 = 49152
1316 */
1317 if (isopkt[u].length > 49152) {
1318 ret = -EINVAL;
1319 goto error;
1320 }
1321 totlen += isopkt[u].length;
1322 }
1323 u *= sizeof(struct usb_iso_packet_descriptor);
1324 uurb->buffer_length = totlen;
1325 break;
1326
1327 default:
1328 return -EINVAL;
1329 }
1330
1331 if (uurb->buffer_length >= USBFS_XFER_MAX) {
1332 ret = -EINVAL;
1333 goto error;
1334 }
1335 if (uurb->buffer_length > 0 &&
1336 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1337 uurb->buffer, uurb->buffer_length)) {
1338 ret = -EFAULT;
1339 goto error;
1340 }
1341 as = alloc_async(uurb->number_of_packets);
1342 if (!as) {
1343 ret = -ENOMEM;
1344 goto error;
1345 }
1346
1347 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1348 num_sgs * sizeof(struct scatterlist);
1349 ret = usbfs_increase_memory_usage(u);
1350 if (ret)
1351 goto error;
1352 as->mem_usage = u;
1353
1354 if (num_sgs) {
1355 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1356 GFP_KERNEL);
1357 if (!as->urb->sg) {
1358 ret = -ENOMEM;
1359 goto error;
1360 }
1361 as->urb->num_sgs = num_sgs;
1362 sg_init_table(as->urb->sg, as->urb->num_sgs);
1363
1364 totlen = uurb->buffer_length;
1365 for (i = 0; i < as->urb->num_sgs; i++) {
1366 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1367 buf = kmalloc(u, GFP_KERNEL);
1368 if (!buf) {
1369 ret = -ENOMEM;
1370 goto error;
1371 }
1372 sg_set_buf(&as->urb->sg[i], buf, u);
1373
1374 if (!is_in) {
1375 if (copy_from_user(buf, uurb->buffer, u)) {
1376 ret = -EFAULT;
1377 goto error;
1378 }
1379 uurb->buffer += u;
1380 }
1381 totlen -= u;
1382 }
1383 } else if (uurb->buffer_length > 0) {
1384 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1385 GFP_KERNEL);
1386 if (!as->urb->transfer_buffer) {
1387 ret = -ENOMEM;
1388 goto error;
1389 }
1390
1391 if (!is_in) {
1392 if (copy_from_user(as->urb->transfer_buffer,
1393 uurb->buffer,
1394 uurb->buffer_length)) {
1395 ret = -EFAULT;
1396 goto error;
1397 }
1398 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1399 /*
1400 * Isochronous input data may end up being
1401 * discontiguous if some of the packets are short.
1402 * Clear the buffer so that the gaps don't leak
1403 * kernel data to userspace.
1404 */
1405 memset(as->urb->transfer_buffer, 0,
1406 uurb->buffer_length);
1407 }
1408 }
1409 as->urb->dev = ps->dev;
1410 as->urb->pipe = (uurb->type << 30) |
1411 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1412 (uurb->endpoint & USB_DIR_IN);
1413
1414 /* This tedious sequence is necessary because the URB_* flags
1415 * are internal to the kernel and subject to change, whereas
1416 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1417 */
1418 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1419 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1420 u |= URB_ISO_ASAP;
1421 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1422 u |= URB_SHORT_NOT_OK;
1423 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1424 u |= URB_NO_FSBR;
1425 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1426 u |= URB_ZERO_PACKET;
1427 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1428 u |= URB_NO_INTERRUPT;
1429 as->urb->transfer_flags = u;
1430
1431 as->urb->transfer_buffer_length = uurb->buffer_length;
1432 as->urb->setup_packet = (unsigned char *)dr;
1433 dr = NULL;
1434 as->urb->start_frame = uurb->start_frame;
1435 as->urb->number_of_packets = uurb->number_of_packets;
1436 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1437 ps->dev->speed == USB_SPEED_HIGH)
1438 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1439 else
1440 as->urb->interval = ep->desc.bInterval;
1441 as->urb->context = as;
1442 as->urb->complete = async_completed;
1443 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1444 as->urb->iso_frame_desc[u].offset = totlen;
1445 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1446 totlen += isopkt[u].length;
1447 }
1448 kfree(isopkt);
1449 isopkt = NULL;
1450 as->ps = ps;
1451 as->userurb = arg;
1452 if (is_in && uurb->buffer_length > 0)
1453 as->userbuffer = uurb->buffer;
1454 else
1455 as->userbuffer = NULL;
1456 as->signr = uurb->signr;
1457 as->ifnum = ifnum;
1458 as->pid = get_pid(task_pid(current));
1459 as->cred = get_current_cred();
1460 security_task_getsecid(current, &as->secid);
1461 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1462 as->urb->transfer_buffer_length, 0, SUBMIT,
1463 NULL, 0);
1464 if (!is_in)
1465 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1466
1467 async_newpending(as);
1468
1469 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1470 spin_lock_irq(&ps->lock);
1471
1472 /* Not exactly the endpoint address; the direction bit is
1473 * shifted to the 0x10 position so that the value will be
1474 * between 0 and 31.
1475 */
1476 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1477 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1478 >> 3);
1479
1480 /* If this bulk URB is the start of a new transfer, re-enable
1481 * the endpoint. Otherwise mark it as a continuation URB.
1482 */
1483 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1484 as->bulk_status = AS_CONTINUATION;
1485 else
1486 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1487
1488 /* Don't accept continuation URBs if the endpoint is
1489 * disabled because of an earlier error.
1490 */
1491 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1492 ret = -EREMOTEIO;
1493 else
1494 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1495 spin_unlock_irq(&ps->lock);
1496 } else {
1497 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1498 }
1499
1500 if (ret) {
1501 dev_printk(KERN_DEBUG, &ps->dev->dev,
1502 "usbfs: usb_submit_urb returned %d\n", ret);
1503 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1504 0, ret, COMPLETE, NULL, 0);
1505 async_removepending(as);
1506 goto error;
1507 }
1508 return 0;
1509
1510 error:
1511 kfree(isopkt);
1512 kfree(dr);
1513 if (as)
1514 free_async(as);
1515 return ret;
1516 }
1517
1518 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1519 {
1520 struct usbdevfs_urb uurb;
1521
1522 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1523 return -EFAULT;
1524
1525 return proc_do_submiturb(ps, &uurb,
1526 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1527 arg);
1528 }
1529
1530 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1531 {
1532 struct urb *urb;
1533 struct async *as;
1534 unsigned long flags;
1535
1536 spin_lock_irqsave(&ps->lock, flags);
1537 as = async_getpending(ps, arg);
1538 if (!as) {
1539 spin_unlock_irqrestore(&ps->lock, flags);
1540 return -EINVAL;
1541 }
1542
1543 urb = as->urb;
1544 usb_get_urb(urb);
1545 spin_unlock_irqrestore(&ps->lock, flags);
1546
1547 usb_kill_urb(urb);
1548 usb_put_urb(urb);
1549
1550 return 0;
1551 }
1552
1553 static int processcompl(struct async *as, void __user * __user *arg)
1554 {
1555 struct urb *urb = as->urb;
1556 struct usbdevfs_urb __user *userurb = as->userurb;
1557 void __user *addr = as->userurb;
1558 unsigned int i;
1559
1560 if (as->userbuffer && urb->actual_length) {
1561 if (copy_urb_data_to_user(as->userbuffer, urb))
1562 goto err_out;
1563 }
1564 if (put_user(as->status, &userurb->status))
1565 goto err_out;
1566 if (put_user(urb->actual_length, &userurb->actual_length))
1567 goto err_out;
1568 if (put_user(urb->error_count, &userurb->error_count))
1569 goto err_out;
1570
1571 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1572 for (i = 0; i < urb->number_of_packets; i++) {
1573 if (put_user(urb->iso_frame_desc[i].actual_length,
1574 &userurb->iso_frame_desc[i].actual_length))
1575 goto err_out;
1576 if (put_user(urb->iso_frame_desc[i].status,
1577 &userurb->iso_frame_desc[i].status))
1578 goto err_out;
1579 }
1580 }
1581
1582 if (put_user(addr, (void __user * __user *)arg))
1583 return -EFAULT;
1584 return 0;
1585
1586 err_out:
1587 return -EFAULT;
1588 }
1589
1590 static struct async *reap_as(struct dev_state *ps)
1591 {
1592 DECLARE_WAITQUEUE(wait, current);
1593 struct async *as = NULL;
1594 struct usb_device *dev = ps->dev;
1595
1596 add_wait_queue(&ps->wait, &wait);
1597 for (;;) {
1598 __set_current_state(TASK_INTERRUPTIBLE);
1599 as = async_getcompleted(ps);
1600 if (as)
1601 break;
1602 if (signal_pending(current))
1603 break;
1604 usb_unlock_device(dev);
1605 schedule();
1606 usb_lock_device(dev);
1607 }
1608 remove_wait_queue(&ps->wait, &wait);
1609 set_current_state(TASK_RUNNING);
1610 return as;
1611 }
1612
1613 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1614 {
1615 struct async *as = reap_as(ps);
1616 if (as) {
1617 int retval = processcompl(as, (void __user * __user *)arg);
1618 free_async(as);
1619 return retval;
1620 }
1621 if (signal_pending(current))
1622 return -EINTR;
1623 return -EIO;
1624 }
1625
1626 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1627 {
1628 int retval;
1629 struct async *as;
1630
1631 as = async_getcompleted(ps);
1632 retval = -EAGAIN;
1633 if (as) {
1634 retval = processcompl(as, (void __user * __user *)arg);
1635 free_async(as);
1636 }
1637 return retval;
1638 }
1639
1640 #ifdef CONFIG_COMPAT
1641 static int proc_control_compat(struct dev_state *ps,
1642 struct usbdevfs_ctrltransfer32 __user *p32)
1643 {
1644 struct usbdevfs_ctrltransfer __user *p;
1645 __u32 udata;
1646 p = compat_alloc_user_space(sizeof(*p));
1647 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1648 get_user(udata, &p32->data) ||
1649 put_user(compat_ptr(udata), &p->data))
1650 return -EFAULT;
1651 return proc_control(ps, p);
1652 }
1653
1654 static int proc_bulk_compat(struct dev_state *ps,
1655 struct usbdevfs_bulktransfer32 __user *p32)
1656 {
1657 struct usbdevfs_bulktransfer __user *p;
1658 compat_uint_t n;
1659 compat_caddr_t addr;
1660
1661 p = compat_alloc_user_space(sizeof(*p));
1662
1663 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1664 get_user(n, &p32->len) || put_user(n, &p->len) ||
1665 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1666 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1667 return -EFAULT;
1668
1669 return proc_bulk(ps, p);
1670 }
1671 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1672 {
1673 struct usbdevfs_disconnectsignal32 ds;
1674
1675 if (copy_from_user(&ds, arg, sizeof(ds)))
1676 return -EFAULT;
1677 ps->discsignr = ds.signr;
1678 ps->disccontext = compat_ptr(ds.context);
1679 return 0;
1680 }
1681
1682 static int get_urb32(struct usbdevfs_urb *kurb,
1683 struct usbdevfs_urb32 __user *uurb)
1684 {
1685 __u32 uptr;
1686 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1687 __get_user(kurb->type, &uurb->type) ||
1688 __get_user(kurb->endpoint, &uurb->endpoint) ||
1689 __get_user(kurb->status, &uurb->status) ||
1690 __get_user(kurb->flags, &uurb->flags) ||
1691 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1692 __get_user(kurb->actual_length, &uurb->actual_length) ||
1693 __get_user(kurb->start_frame, &uurb->start_frame) ||
1694 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1695 __get_user(kurb->error_count, &uurb->error_count) ||
1696 __get_user(kurb->signr, &uurb->signr))
1697 return -EFAULT;
1698
1699 if (__get_user(uptr, &uurb->buffer))
1700 return -EFAULT;
1701 kurb->buffer = compat_ptr(uptr);
1702 if (__get_user(uptr, &uurb->usercontext))
1703 return -EFAULT;
1704 kurb->usercontext = compat_ptr(uptr);
1705
1706 return 0;
1707 }
1708
1709 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1710 {
1711 struct usbdevfs_urb uurb;
1712
1713 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1714 return -EFAULT;
1715
1716 return proc_do_submiturb(ps, &uurb,
1717 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1718 arg);
1719 }
1720
1721 static int processcompl_compat(struct async *as, void __user * __user *arg)
1722 {
1723 struct urb *urb = as->urb;
1724 struct usbdevfs_urb32 __user *userurb = as->userurb;
1725 void __user *addr = as->userurb;
1726 unsigned int i;
1727
1728 if (as->userbuffer && urb->actual_length) {
1729 if (copy_urb_data_to_user(as->userbuffer, urb))
1730 return -EFAULT;
1731 }
1732 if (put_user(as->status, &userurb->status))
1733 return -EFAULT;
1734 if (put_user(urb->actual_length, &userurb->actual_length))
1735 return -EFAULT;
1736 if (put_user(urb->error_count, &userurb->error_count))
1737 return -EFAULT;
1738
1739 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1740 for (i = 0; i < urb->number_of_packets; i++) {
1741 if (put_user(urb->iso_frame_desc[i].actual_length,
1742 &userurb->iso_frame_desc[i].actual_length))
1743 return -EFAULT;
1744 if (put_user(urb->iso_frame_desc[i].status,
1745 &userurb->iso_frame_desc[i].status))
1746 return -EFAULT;
1747 }
1748 }
1749
1750 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1751 return -EFAULT;
1752 return 0;
1753 }
1754
1755 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1756 {
1757 struct async *as = reap_as(ps);
1758 if (as) {
1759 int retval = processcompl_compat(as, (void __user * __user *)arg);
1760 free_async(as);
1761 return retval;
1762 }
1763 if (signal_pending(current))
1764 return -EINTR;
1765 return -EIO;
1766 }
1767
1768 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1769 {
1770 int retval;
1771 struct async *as;
1772
1773 retval = -EAGAIN;
1774 as = async_getcompleted(ps);
1775 if (as) {
1776 retval = processcompl_compat(as, (void __user * __user *)arg);
1777 free_async(as);
1778 }
1779 return retval;
1780 }
1781
1782
1783 #endif
1784
1785 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1786 {
1787 struct usbdevfs_disconnectsignal ds;
1788
1789 if (copy_from_user(&ds, arg, sizeof(ds)))
1790 return -EFAULT;
1791 ps->discsignr = ds.signr;
1792 ps->disccontext = ds.context;
1793 return 0;
1794 }
1795
1796 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1797 {
1798 unsigned int ifnum;
1799
1800 if (get_user(ifnum, (unsigned int __user *)arg))
1801 return -EFAULT;
1802 return claimintf(ps, ifnum);
1803 }
1804
1805 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1806 {
1807 unsigned int ifnum;
1808 int ret;
1809
1810 if (get_user(ifnum, (unsigned int __user *)arg))
1811 return -EFAULT;
1812 if ((ret = releaseintf(ps, ifnum)) < 0)
1813 return ret;
1814 destroy_async_on_interface (ps, ifnum);
1815 return 0;
1816 }
1817
1818 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1819 {
1820 int size;
1821 void *buf = NULL;
1822 int retval = 0;
1823 struct usb_interface *intf = NULL;
1824 struct usb_driver *driver = NULL;
1825
1826 /* alloc buffer */
1827 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1828 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1829 return -ENOMEM;
1830 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1831 if (copy_from_user(buf, ctl->data, size)) {
1832 kfree(buf);
1833 return -EFAULT;
1834 }
1835 } else {
1836 memset(buf, 0, size);
1837 }
1838 }
1839
1840 if (!connected(ps)) {
1841 kfree(buf);
1842 return -ENODEV;
1843 }
1844
1845 if (ps->dev->state != USB_STATE_CONFIGURED)
1846 retval = -EHOSTUNREACH;
1847 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1848 retval = -EINVAL;
1849 else switch (ctl->ioctl_code) {
1850
1851 /* disconnect kernel driver from interface */
1852 case USBDEVFS_DISCONNECT:
1853 if (intf->dev.driver) {
1854 driver = to_usb_driver(intf->dev.driver);
1855 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1856 usb_driver_release_interface(driver, intf);
1857 } else
1858 retval = -ENODATA;
1859 break;
1860
1861 /* let kernel drivers try to (re)bind to the interface */
1862 case USBDEVFS_CONNECT:
1863 if (!intf->dev.driver)
1864 retval = device_attach(&intf->dev);
1865 else
1866 retval = -EBUSY;
1867 break;
1868
1869 /* talk directly to the interface's driver */
1870 default:
1871 if (intf->dev.driver)
1872 driver = to_usb_driver(intf->dev.driver);
1873 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1874 retval = -ENOTTY;
1875 } else {
1876 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1877 if (retval == -ENOIOCTLCMD)
1878 retval = -ENOTTY;
1879 }
1880 }
1881
1882 /* cleanup and return */
1883 if (retval >= 0
1884 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1885 && size > 0
1886 && copy_to_user(ctl->data, buf, size) != 0)
1887 retval = -EFAULT;
1888
1889 kfree(buf);
1890 return retval;
1891 }
1892
1893 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1894 {
1895 struct usbdevfs_ioctl ctrl;
1896
1897 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1898 return -EFAULT;
1899 return proc_ioctl(ps, &ctrl);
1900 }
1901
1902 #ifdef CONFIG_COMPAT
1903 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1904 {
1905 struct usbdevfs_ioctl32 __user *uioc;
1906 struct usbdevfs_ioctl ctrl;
1907 u32 udata;
1908
1909 uioc = compat_ptr((long)arg);
1910 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1911 __get_user(ctrl.ifno, &uioc->ifno) ||
1912 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1913 __get_user(udata, &uioc->data))
1914 return -EFAULT;
1915 ctrl.data = compat_ptr(udata);
1916
1917 return proc_ioctl(ps, &ctrl);
1918 }
1919 #endif
1920
1921 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1922 {
1923 unsigned portnum;
1924 int rc;
1925
1926 if (get_user(portnum, (unsigned __user *) arg))
1927 return -EFAULT;
1928 rc = usb_hub_claim_port(ps->dev, portnum, ps);
1929 if (rc == 0)
1930 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1931 portnum, task_pid_nr(current), current->comm);
1932 return rc;
1933 }
1934
1935 static int proc_release_port(struct dev_state *ps, void __user *arg)
1936 {
1937 unsigned portnum;
1938
1939 if (get_user(portnum, (unsigned __user *) arg))
1940 return -EFAULT;
1941 return usb_hub_release_port(ps->dev, portnum, ps);
1942 }
1943
1944 static int proc_get_capabilities(struct dev_state *ps, void __user *arg)
1945 {
1946 __u32 caps;
1947
1948 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM;
1949 if (!ps->dev->bus->no_stop_on_short)
1950 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
1951 if (ps->dev->bus->sg_tablesize)
1952 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
1953
1954 if (put_user(caps, (__u32 __user *)arg))
1955 return -EFAULT;
1956
1957 return 0;
1958 }
1959
1960 static int proc_disconnect_claim(struct dev_state *ps, void __user *arg)
1961 {
1962 struct usbdevfs_disconnect_claim dc;
1963 struct usb_interface *intf;
1964
1965 if (copy_from_user(&dc, arg, sizeof(dc)))
1966 return -EFAULT;
1967
1968 intf = usb_ifnum_to_if(ps->dev, dc.interface);
1969 if (!intf)
1970 return -EINVAL;
1971
1972 if (intf->dev.driver) {
1973 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
1974
1975 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
1976 strncmp(dc.driver, intf->dev.driver->name,
1977 sizeof(dc.driver)) != 0)
1978 return -EBUSY;
1979
1980 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
1981 strncmp(dc.driver, intf->dev.driver->name,
1982 sizeof(dc.driver)) == 0)
1983 return -EBUSY;
1984
1985 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1986 usb_driver_release_interface(driver, intf);
1987 }
1988
1989 return claimintf(ps, dc.interface);
1990 }
1991
1992 /*
1993 * NOTE: All requests here that have interface numbers as parameters
1994 * are assuming that somehow the configuration has been prevented from
1995 * changing. But there's no mechanism to ensure that...
1996 */
1997 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1998 void __user *p)
1999 {
2000 struct dev_state *ps = file->private_data;
2001 struct inode *inode = file_inode(file);
2002 struct usb_device *dev = ps->dev;
2003 int ret = -ENOTTY;
2004
2005 if (!(file->f_mode & FMODE_WRITE))
2006 return -EPERM;
2007
2008 usb_lock_device(dev);
2009 if (!connected(ps)) {
2010 usb_unlock_device(dev);
2011 return -ENODEV;
2012 }
2013
2014 switch (cmd) {
2015 case USBDEVFS_CONTROL:
2016 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2017 ret = proc_control(ps, p);
2018 if (ret >= 0)
2019 inode->i_mtime = CURRENT_TIME;
2020 break;
2021
2022 case USBDEVFS_BULK:
2023 snoop(&dev->dev, "%s: BULK\n", __func__);
2024 ret = proc_bulk(ps, p);
2025 if (ret >= 0)
2026 inode->i_mtime = CURRENT_TIME;
2027 break;
2028
2029 case USBDEVFS_RESETEP:
2030 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2031 ret = proc_resetep(ps, p);
2032 if (ret >= 0)
2033 inode->i_mtime = CURRENT_TIME;
2034 break;
2035
2036 case USBDEVFS_RESET:
2037 snoop(&dev->dev, "%s: RESET\n", __func__);
2038 ret = proc_resetdevice(ps);
2039 break;
2040
2041 case USBDEVFS_CLEAR_HALT:
2042 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2043 ret = proc_clearhalt(ps, p);
2044 if (ret >= 0)
2045 inode->i_mtime = CURRENT_TIME;
2046 break;
2047
2048 case USBDEVFS_GETDRIVER:
2049 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2050 ret = proc_getdriver(ps, p);
2051 break;
2052
2053 case USBDEVFS_CONNECTINFO:
2054 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2055 ret = proc_connectinfo(ps, p);
2056 break;
2057
2058 case USBDEVFS_SETINTERFACE:
2059 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2060 ret = proc_setintf(ps, p);
2061 break;
2062
2063 case USBDEVFS_SETCONFIGURATION:
2064 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2065 ret = proc_setconfig(ps, p);
2066 break;
2067
2068 case USBDEVFS_SUBMITURB:
2069 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2070 ret = proc_submiturb(ps, p);
2071 if (ret >= 0)
2072 inode->i_mtime = CURRENT_TIME;
2073 break;
2074
2075 #ifdef CONFIG_COMPAT
2076 case USBDEVFS_CONTROL32:
2077 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2078 ret = proc_control_compat(ps, p);
2079 if (ret >= 0)
2080 inode->i_mtime = CURRENT_TIME;
2081 break;
2082
2083 case USBDEVFS_BULK32:
2084 snoop(&dev->dev, "%s: BULK32\n", __func__);
2085 ret = proc_bulk_compat(ps, p);
2086 if (ret >= 0)
2087 inode->i_mtime = CURRENT_TIME;
2088 break;
2089
2090 case USBDEVFS_DISCSIGNAL32:
2091 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2092 ret = proc_disconnectsignal_compat(ps, p);
2093 break;
2094
2095 case USBDEVFS_SUBMITURB32:
2096 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2097 ret = proc_submiturb_compat(ps, p);
2098 if (ret >= 0)
2099 inode->i_mtime = CURRENT_TIME;
2100 break;
2101
2102 case USBDEVFS_REAPURB32:
2103 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2104 ret = proc_reapurb_compat(ps, p);
2105 break;
2106
2107 case USBDEVFS_REAPURBNDELAY32:
2108 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2109 ret = proc_reapurbnonblock_compat(ps, p);
2110 break;
2111
2112 case USBDEVFS_IOCTL32:
2113 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2114 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2115 break;
2116 #endif
2117
2118 case USBDEVFS_DISCARDURB:
2119 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
2120 ret = proc_unlinkurb(ps, p);
2121 break;
2122
2123 case USBDEVFS_REAPURB:
2124 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2125 ret = proc_reapurb(ps, p);
2126 break;
2127
2128 case USBDEVFS_REAPURBNDELAY:
2129 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2130 ret = proc_reapurbnonblock(ps, p);
2131 break;
2132
2133 case USBDEVFS_DISCSIGNAL:
2134 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2135 ret = proc_disconnectsignal(ps, p);
2136 break;
2137
2138 case USBDEVFS_CLAIMINTERFACE:
2139 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2140 ret = proc_claiminterface(ps, p);
2141 break;
2142
2143 case USBDEVFS_RELEASEINTERFACE:
2144 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2145 ret = proc_releaseinterface(ps, p);
2146 break;
2147
2148 case USBDEVFS_IOCTL:
2149 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2150 ret = proc_ioctl_default(ps, p);
2151 break;
2152
2153 case USBDEVFS_CLAIM_PORT:
2154 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2155 ret = proc_claim_port(ps, p);
2156 break;
2157
2158 case USBDEVFS_RELEASE_PORT:
2159 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2160 ret = proc_release_port(ps, p);
2161 break;
2162 case USBDEVFS_GET_CAPABILITIES:
2163 ret = proc_get_capabilities(ps, p);
2164 break;
2165 case USBDEVFS_DISCONNECT_CLAIM:
2166 ret = proc_disconnect_claim(ps, p);
2167 break;
2168 }
2169 usb_unlock_device(dev);
2170 if (ret >= 0)
2171 inode->i_atime = CURRENT_TIME;
2172 return ret;
2173 }
2174
2175 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2176 unsigned long arg)
2177 {
2178 int ret;
2179
2180 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2181
2182 return ret;
2183 }
2184
2185 #ifdef CONFIG_COMPAT
2186 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2187 unsigned long arg)
2188 {
2189 int ret;
2190
2191 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2192
2193 return ret;
2194 }
2195 #endif
2196
2197 /* No kernel lock - fine */
2198 static unsigned int usbdev_poll(struct file *file,
2199 struct poll_table_struct *wait)
2200 {
2201 struct dev_state *ps = file->private_data;
2202 unsigned int mask = 0;
2203
2204 poll_wait(file, &ps->wait, wait);
2205 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2206 mask |= POLLOUT | POLLWRNORM;
2207 if (!connected(ps))
2208 mask |= POLLERR | POLLHUP;
2209 return mask;
2210 }
2211
2212 const struct file_operations usbdev_file_operations = {
2213 .owner = THIS_MODULE,
2214 .llseek = usbdev_lseek,
2215 .read = usbdev_read,
2216 .poll = usbdev_poll,
2217 .unlocked_ioctl = usbdev_ioctl,
2218 #ifdef CONFIG_COMPAT
2219 .compat_ioctl = usbdev_compat_ioctl,
2220 #endif
2221 .open = usbdev_open,
2222 .release = usbdev_release,
2223 };
2224
2225 static void usbdev_remove(struct usb_device *udev)
2226 {
2227 struct dev_state *ps;
2228 struct siginfo sinfo;
2229
2230 while (!list_empty(&udev->filelist)) {
2231 ps = list_entry(udev->filelist.next, struct dev_state, list);
2232 destroy_all_async(ps);
2233 wake_up_all(&ps->wait);
2234 list_del_init(&ps->list);
2235 if (ps->discsignr) {
2236 sinfo.si_signo = ps->discsignr;
2237 sinfo.si_errno = EPIPE;
2238 sinfo.si_code = SI_ASYNCIO;
2239 sinfo.si_addr = ps->disccontext;
2240 kill_pid_info_as_cred(ps->discsignr, &sinfo,
2241 ps->disc_pid, ps->cred, ps->secid);
2242 }
2243 }
2244 }
2245
2246 static int usbdev_notify(struct notifier_block *self,
2247 unsigned long action, void *dev)
2248 {
2249 switch (action) {
2250 case USB_DEVICE_ADD:
2251 break;
2252 case USB_DEVICE_REMOVE:
2253 usbdev_remove(dev);
2254 break;
2255 }
2256 return NOTIFY_OK;
2257 }
2258
2259 static struct notifier_block usbdev_nb = {
2260 .notifier_call = usbdev_notify,
2261 };
2262
2263 static struct cdev usb_device_cdev;
2264
2265 int __init usb_devio_init(void)
2266 {
2267 int retval;
2268
2269 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2270 "usb_device");
2271 if (retval) {
2272 printk(KERN_ERR "Unable to register minors for usb_device\n");
2273 goto out;
2274 }
2275 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2276 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2277 if (retval) {
2278 printk(KERN_ERR "Unable to get usb_device major %d\n",
2279 USB_DEVICE_MAJOR);
2280 goto error_cdev;
2281 }
2282 usb_register_notify(&usbdev_nb);
2283 out:
2284 return retval;
2285
2286 error_cdev:
2287 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2288 goto out;
2289 }
2290
2291 void usb_devio_cleanup(void)
2292 {
2293 usb_unregister_notify(&usbdev_nb);
2294 cdev_del(&usb_device_cdev);
2295 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2296 }
kernel source for telekom puls (alcatel/mediatek)