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Linux 4.19.133
[linux/fpc-iii.git] / drivers / usb / core / devio.c
blob00204824bffd8ea051819552238f101c0cf04d32
1 // SPDX-License-Identifier: GPL-2.0+
2 /*****************************************************************************/
3
4 /*
5 * devio.c -- User space communication with USB devices.
6 *
7 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
8 *
9 * This file implements the usbfs/x/y files, where
10 * x is the bus number and y the device number.
11 *
12 * It allows user space programs/"drivers" to communicate directly
13 * with USB devices without intervening kernel driver.
14 *
15 * Revision history
16 * 22.12.1999 0.1 Initial release (split from proc_usb.c)
17 * 04.01.2000 0.2 Turned into its own filesystem
18 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
19 * (CAN-2005-3055)
20 */
21
22 /*****************************************************************************/
23
24 #include <linux/fs.h>
25 #include <linux/mm.h>
26 #include <linux/sched/signal.h>
27 #include <linux/slab.h>
28 #include <linux/signal.h>
29 #include <linux/poll.h>
30 #include <linux/module.h>
31 #include <linux/string.h>
32 #include <linux/usb.h>
33 #include <linux/usbdevice_fs.h>
34 #include <linux/usb/hcd.h> /* for usbcore internals */
35 #include <linux/cdev.h>
36 #include <linux/notifier.h>
37 #include <linux/security.h>
38 #include <linux/user_namespace.h>
39 #include <linux/scatterlist.h>
40 #include <linux/uaccess.h>
41 #include <linux/dma-mapping.h>
42 #include <asm/byteorder.h>
43 #include <linux/moduleparam.h>
44
45 #include "usb.h"
46
47 #define USB_MAXBUS 64
48 #define USB_DEVICE_MAX (USB_MAXBUS * 128)
49 #define USB_SG_SIZE 16384 /* split-size for large txs */
50
51 /* Mutual exclusion for removal, open, and release */
52 DEFINE_MUTEX(usbfs_mutex);
53
54 struct usb_dev_state {
55 struct list_head list; /* state list */
56 struct usb_device *dev;
57 struct file *file;
58 spinlock_t lock; /* protects the async urb lists */
59 struct list_head async_pending;
60 struct list_head async_completed;
61 struct list_head memory_list;
62 wait_queue_head_t wait; /* wake up if a request completed */
63 unsigned int discsignr;
64 struct pid *disc_pid;
65 const struct cred *cred;
66 void __user *disccontext;
67 unsigned long ifclaimed;
68 u32 disabled_bulk_eps;
69 bool privileges_dropped;
70 unsigned long interface_allowed_mask;
71 };
72
73 struct usb_memory {
74 struct list_head memlist;
75 int vma_use_count;
76 int urb_use_count;
77 u32 size;
78 void *mem;
79 dma_addr_t dma_handle;
80 unsigned long vm_start;
81 struct usb_dev_state *ps;
82 };
83
84 struct async {
85 struct list_head asynclist;
86 struct usb_dev_state *ps;
87 struct pid *pid;
88 const struct cred *cred;
89 unsigned int signr;
90 unsigned int ifnum;
91 void __user *userbuffer;
92 void __user *userurb;
93 struct urb *urb;
94 struct usb_memory *usbm;
95 unsigned int mem_usage;
96 int status;
97 u8 bulk_addr;
98 u8 bulk_status;
99 };
100
101 static bool usbfs_snoop;
102 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
103 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
104
105 static unsigned usbfs_snoop_max = 65536;
106 module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
107 MODULE_PARM_DESC(usbfs_snoop_max,
108 "maximum number of bytes to print while snooping");
109
110 #define snoop(dev, format, arg...) \
111 do { \
112 if (usbfs_snoop) \
113 dev_info(dev, format, ## arg); \
114 } while (0)
115
116 enum snoop_when {
117 SUBMIT, COMPLETE
118 };
119
120 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
121
122 /* Limit on the total amount of memory we can allocate for transfers */
123 static u32 usbfs_memory_mb = 16;
124 module_param(usbfs_memory_mb, uint, 0644);
125 MODULE_PARM_DESC(usbfs_memory_mb,
126 "maximum MB allowed for usbfs buffers (0 = no limit)");
127
128 /* Hard limit, necessary to avoid arithmetic overflow */
129 #define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
130
131 static atomic64_t usbfs_memory_usage; /* Total memory currently allocated */
132
133 /* Check whether it's okay to allocate more memory for a transfer */
134 static int usbfs_increase_memory_usage(u64 amount)
135 {
136 u64 lim;
137
138 lim = READ_ONCE(usbfs_memory_mb);
139 lim <<= 20;
140
141 atomic64_add(amount, &usbfs_memory_usage);
142
143 if (lim > 0 && atomic64_read(&usbfs_memory_usage) > lim) {
144 atomic64_sub(amount, &usbfs_memory_usage);
145 return -ENOMEM;
146 }
147
148 return 0;
149 }
150
151 /* Memory for a transfer is being deallocated */
152 static void usbfs_decrease_memory_usage(u64 amount)
153 {
154 atomic64_sub(amount, &usbfs_memory_usage);
155 }
156
157 static int connected(struct usb_dev_state *ps)
158 {
159 return (!list_empty(&ps->list) &&
160 ps->dev->state != USB_STATE_NOTATTACHED);
161 }
162
163 static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
164 {
165 struct usb_dev_state *ps = usbm->ps;
166 unsigned long flags;
167
168 spin_lock_irqsave(&ps->lock, flags);
169 --*count;
170 if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
171 list_del(&usbm->memlist);
172 spin_unlock_irqrestore(&ps->lock, flags);
173
174 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
175 usbm->dma_handle);
176 usbfs_decrease_memory_usage(
177 usbm->size + sizeof(struct usb_memory));
178 kfree(usbm);
179 } else {
180 spin_unlock_irqrestore(&ps->lock, flags);
181 }
182 }
183
184 static void usbdev_vm_open(struct vm_area_struct *vma)
185 {
186 struct usb_memory *usbm = vma->vm_private_data;
187 unsigned long flags;
188
189 spin_lock_irqsave(&usbm->ps->lock, flags);
190 ++usbm->vma_use_count;
191 spin_unlock_irqrestore(&usbm->ps->lock, flags);
192 }
193
194 static void usbdev_vm_close(struct vm_area_struct *vma)
195 {
196 struct usb_memory *usbm = vma->vm_private_data;
197
198 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
199 }
200
201 static const struct vm_operations_struct usbdev_vm_ops = {
202 .open = usbdev_vm_open,
203 .close = usbdev_vm_close
204 };
205
206 static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
207 {
208 struct usb_memory *usbm = NULL;
209 struct usb_dev_state *ps = file->private_data;
210 size_t size = vma->vm_end - vma->vm_start;
211 void *mem;
212 unsigned long flags;
213 dma_addr_t dma_handle;
214 int ret;
215
216 ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
217 if (ret)
218 goto error;
219
220 usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
221 if (!usbm) {
222 ret = -ENOMEM;
223 goto error_decrease_mem;
224 }
225
226 mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
227 &dma_handle);
228 if (!mem) {
229 ret = -ENOMEM;
230 goto error_free_usbm;
231 }
232
233 memset(mem, 0, size);
234
235 usbm->mem = mem;
236 usbm->dma_handle = dma_handle;
237 usbm->size = size;
238 usbm->ps = ps;
239 usbm->vm_start = vma->vm_start;
240 usbm->vma_use_count = 1;
241 INIT_LIST_HEAD(&usbm->memlist);
242
243 if (remap_pfn_range(vma, vma->vm_start,
244 virt_to_phys(usbm->mem) >> PAGE_SHIFT,
245 size, vma->vm_page_prot) < 0) {
246 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
247 return -EAGAIN;
248 }
249
250 vma->vm_flags |= VM_IO;
251 vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
252 vma->vm_ops = &usbdev_vm_ops;
253 vma->vm_private_data = usbm;
254
255 spin_lock_irqsave(&ps->lock, flags);
256 list_add_tail(&usbm->memlist, &ps->memory_list);
257 spin_unlock_irqrestore(&ps->lock, flags);
258
259 return 0;
260
261 error_free_usbm:
262 kfree(usbm);
263 error_decrease_mem:
264 usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
265 error:
266 return ret;
267 }
268
269 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
270 loff_t *ppos)
271 {
272 struct usb_dev_state *ps = file->private_data;
273 struct usb_device *dev = ps->dev;
274 ssize_t ret = 0;
275 unsigned len;
276 loff_t pos;
277 int i;
278
279 pos = *ppos;
280 usb_lock_device(dev);
281 if (!connected(ps)) {
282 ret = -ENODEV;
283 goto err;
284 } else if (pos < 0) {
285 ret = -EINVAL;
286 goto err;
287 }
288
289 if (pos < sizeof(struct usb_device_descriptor)) {
290 /* 18 bytes - fits on the stack */
291 struct usb_device_descriptor temp_desc;
292
293 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
294 le16_to_cpus(&temp_desc.bcdUSB);
295 le16_to_cpus(&temp_desc.idVendor);
296 le16_to_cpus(&temp_desc.idProduct);
297 le16_to_cpus(&temp_desc.bcdDevice);
298
299 len = sizeof(struct usb_device_descriptor) - pos;
300 if (len > nbytes)
301 len = nbytes;
302 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
303 ret = -EFAULT;
304 goto err;
305 }
306
307 *ppos += len;
308 buf += len;
309 nbytes -= len;
310 ret += len;
311 }
312
313 pos = sizeof(struct usb_device_descriptor);
314 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
315 struct usb_config_descriptor *config =
316 (struct usb_config_descriptor *)dev->rawdescriptors[i];
317 unsigned int length = le16_to_cpu(config->wTotalLength);
318
319 if (*ppos < pos + length) {
320
321 /* The descriptor may claim to be longer than it
322 * really is. Here is the actual allocated length. */
323 unsigned alloclen =
324 le16_to_cpu(dev->config[i].desc.wTotalLength);
325
326 len = length - (*ppos - pos);
327 if (len > nbytes)
328 len = nbytes;
329
330 /* Simply don't write (skip over) unallocated parts */
331 if (alloclen > (*ppos - pos)) {
332 alloclen -= (*ppos - pos);
333 if (copy_to_user(buf,
334 dev->rawdescriptors[i] + (*ppos - pos),
335 min(len, alloclen))) {
336 ret = -EFAULT;
337 goto err;
338 }
339 }
340
341 *ppos += len;
342 buf += len;
343 nbytes -= len;
344 ret += len;
345 }
346
347 pos += length;
348 }
349
350 err:
351 usb_unlock_device(dev);
352 return ret;
353 }
354
355 /*
356 * async list handling
357 */
358
359 static struct async *alloc_async(unsigned int numisoframes)
360 {
361 struct async *as;
362
363 as = kzalloc(sizeof(struct async), GFP_KERNEL);
364 if (!as)
365 return NULL;
366 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
367 if (!as->urb) {
368 kfree(as);
369 return NULL;
370 }
371 return as;
372 }
373
374 static void free_async(struct async *as)
375 {
376 int i;
377
378 put_pid(as->pid);
379 if (as->cred)
380 put_cred(as->cred);
381 for (i = 0; i < as->urb->num_sgs; i++) {
382 if (sg_page(&as->urb->sg[i]))
383 kfree(sg_virt(&as->urb->sg[i]));
384 }
385
386 kfree(as->urb->sg);
387 if (as->usbm == NULL)
388 kfree(as->urb->transfer_buffer);
389 else
390 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
391
392 kfree(as->urb->setup_packet);
393 usb_free_urb(as->urb);
394 usbfs_decrease_memory_usage(as->mem_usage);
395 kfree(as);
396 }
397
398 static void async_newpending(struct async *as)
399 {
400 struct usb_dev_state *ps = as->ps;
401 unsigned long flags;
402
403 spin_lock_irqsave(&ps->lock, flags);
404 list_add_tail(&as->asynclist, &ps->async_pending);
405 spin_unlock_irqrestore(&ps->lock, flags);
406 }
407
408 static void async_removepending(struct async *as)
409 {
410 struct usb_dev_state *ps = as->ps;
411 unsigned long flags;
412
413 spin_lock_irqsave(&ps->lock, flags);
414 list_del_init(&as->asynclist);
415 spin_unlock_irqrestore(&ps->lock, flags);
416 }
417
418 static struct async *async_getcompleted(struct usb_dev_state *ps)
419 {
420 unsigned long flags;
421 struct async *as = NULL;
422
423 spin_lock_irqsave(&ps->lock, flags);
424 if (!list_empty(&ps->async_completed)) {
425 as = list_entry(ps->async_completed.next, struct async,
426 asynclist);
427 list_del_init(&as->asynclist);
428 }
429 spin_unlock_irqrestore(&ps->lock, flags);
430 return as;
431 }
432
433 static struct async *async_getpending(struct usb_dev_state *ps,
434 void __user *userurb)
435 {
436 struct async *as;
437
438 list_for_each_entry(as, &ps->async_pending, asynclist)
439 if (as->userurb == userurb) {
440 list_del_init(&as->asynclist);
441 return as;
442 }
443
444 return NULL;
445 }
446
447 static void snoop_urb(struct usb_device *udev,
448 void __user *userurb, int pipe, unsigned length,
449 int timeout_or_status, enum snoop_when when,
450 unsigned char *data, unsigned data_len)
451 {
452 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
453 static const char *dirs[] = {"out", "in"};
454 int ep;
455 const char *t, *d;
456
457 if (!usbfs_snoop)
458 return;
459
460 ep = usb_pipeendpoint(pipe);
461 t = types[usb_pipetype(pipe)];
462 d = dirs[!!usb_pipein(pipe)];
463
464 if (userurb) { /* Async */
465 if (when == SUBMIT)
466 dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
467 "length %u\n",
468 userurb, ep, t, d, length);
469 else
470 dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
471 "actual_length %u status %d\n",
472 userurb, ep, t, d, length,
473 timeout_or_status);
474 } else {
475 if (when == SUBMIT)
476 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
477 "timeout %d\n",
478 ep, t, d, length, timeout_or_status);
479 else
480 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
481 "status %d\n",
482 ep, t, d, length, timeout_or_status);
483 }
484
485 data_len = min(data_len, usbfs_snoop_max);
486 if (data && data_len > 0) {
487 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
488 data, data_len, 1);
489 }
490 }
491
492 static void snoop_urb_data(struct urb *urb, unsigned len)
493 {
494 int i, size;
495
496 len = min(len, usbfs_snoop_max);
497 if (!usbfs_snoop || len == 0)
498 return;
499
500 if (urb->num_sgs == 0) {
501 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
502 urb->transfer_buffer, len, 1);
503 return;
504 }
505
506 for (i = 0; i < urb->num_sgs && len; i++) {
507 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
508 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
509 sg_virt(&urb->sg[i]), size, 1);
510 len -= size;
511 }
512 }
513
514 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
515 {
516 unsigned i, len, size;
517
518 if (urb->number_of_packets > 0) /* Isochronous */
519 len = urb->transfer_buffer_length;
520 else /* Non-Isoc */
521 len = urb->actual_length;
522
523 if (urb->num_sgs == 0) {
524 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
525 return -EFAULT;
526 return 0;
527 }
528
529 for (i = 0; i < urb->num_sgs && len; i++) {
530 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
531 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
532 return -EFAULT;
533 userbuffer += size;
534 len -= size;
535 }
536
537 return 0;
538 }
539
540 #define AS_CONTINUATION 1
541 #define AS_UNLINK 2
542
543 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
544 __releases(ps->lock)
545 __acquires(ps->lock)
546 {
547 struct urb *urb;
548 struct async *as;
549
550 /* Mark all the pending URBs that match bulk_addr, up to but not
551 * including the first one without AS_CONTINUATION. If such an
552 * URB is encountered then a new transfer has already started so
553 * the endpoint doesn't need to be disabled; otherwise it does.
554 */
555 list_for_each_entry(as, &ps->async_pending, asynclist) {
556 if (as->bulk_addr == bulk_addr) {
557 if (as->bulk_status != AS_CONTINUATION)
558 goto rescan;
559 as->bulk_status = AS_UNLINK;
560 as->bulk_addr = 0;
561 }
562 }
563 ps->disabled_bulk_eps |= (1 << bulk_addr);
564
565 /* Now carefully unlink all the marked pending URBs */
566 rescan:
567 list_for_each_entry(as, &ps->async_pending, asynclist) {
568 if (as->bulk_status == AS_UNLINK) {
569 as->bulk_status = 0; /* Only once */
570 urb = as->urb;
571 usb_get_urb(urb);
572 spin_unlock(&ps->lock); /* Allow completions */
573 usb_unlink_urb(urb);
574 usb_put_urb(urb);
575 spin_lock(&ps->lock);
576 goto rescan;
577 }
578 }
579 }
580
581 static void async_completed(struct urb *urb)
582 {
583 struct async *as = urb->context;
584 struct usb_dev_state *ps = as->ps;
585 struct siginfo sinfo;
586 struct pid *pid = NULL;
587 const struct cred *cred = NULL;
588 unsigned long flags;
589 int signr;
590
591 spin_lock_irqsave(&ps->lock, flags);
592 list_move_tail(&as->asynclist, &ps->async_completed);
593 as->status = urb->status;
594 signr = as->signr;
595 if (signr) {
596 clear_siginfo(&sinfo);
597 sinfo.si_signo = as->signr;
598 sinfo.si_errno = as->status;
599 sinfo.si_code = SI_ASYNCIO;
600 sinfo.si_addr = as->userurb;
601 pid = get_pid(as->pid);
602 cred = get_cred(as->cred);
603 }
604 snoop(&urb->dev->dev, "urb complete\n");
605 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
606 as->status, COMPLETE, NULL, 0);
607 if ((urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN)
608 snoop_urb_data(urb, urb->actual_length);
609
610 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
611 as->status != -ENOENT)
612 cancel_bulk_urbs(ps, as->bulk_addr);
613
614 wake_up(&ps->wait);
615 spin_unlock_irqrestore(&ps->lock, flags);
616
617 if (signr) {
618 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred);
619 put_pid(pid);
620 put_cred(cred);
621 }
622 }
623
624 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
625 {
626 struct urb *urb;
627 struct async *as;
628 unsigned long flags;
629
630 spin_lock_irqsave(&ps->lock, flags);
631 while (!list_empty(list)) {
632 as = list_entry(list->next, struct async, asynclist);
633 list_del_init(&as->asynclist);
634 urb = as->urb;
635 usb_get_urb(urb);
636
637 /* drop the spinlock so the completion handler can run */
638 spin_unlock_irqrestore(&ps->lock, flags);
639 usb_kill_urb(urb);
640 usb_put_urb(urb);
641 spin_lock_irqsave(&ps->lock, flags);
642 }
643 spin_unlock_irqrestore(&ps->lock, flags);
644 }
645
646 static void destroy_async_on_interface(struct usb_dev_state *ps,
647 unsigned int ifnum)
648 {
649 struct list_head *p, *q, hitlist;
650 unsigned long flags;
651
652 INIT_LIST_HEAD(&hitlist);
653 spin_lock_irqsave(&ps->lock, flags);
654 list_for_each_safe(p, q, &ps->async_pending)
655 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
656 list_move_tail(p, &hitlist);
657 spin_unlock_irqrestore(&ps->lock, flags);
658 destroy_async(ps, &hitlist);
659 }
660
661 static void destroy_all_async(struct usb_dev_state *ps)
662 {
663 destroy_async(ps, &ps->async_pending);
664 }
665
666 /*
667 * interface claims are made only at the request of user level code,
668 * which can also release them (explicitly or by closing files).
669 * they're also undone when devices disconnect.
670 */
671
672 static int driver_probe(struct usb_interface *intf,
673 const struct usb_device_id *id)
674 {
675 return -ENODEV;
676 }
677
678 static void driver_disconnect(struct usb_interface *intf)
679 {
680 struct usb_dev_state *ps = usb_get_intfdata(intf);
681 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
682
683 if (!ps)
684 return;
685
686 /* NOTE: this relies on usbcore having canceled and completed
687 * all pending I/O requests; 2.6 does that.
688 */
689
690 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
691 clear_bit(ifnum, &ps->ifclaimed);
692 else
693 dev_warn(&intf->dev, "interface number %u out of range\n",
694 ifnum);
695
696 usb_set_intfdata(intf, NULL);
697
698 /* force async requests to complete */
699 destroy_async_on_interface(ps, ifnum);
700 }
701
702 /* The following routines are merely placeholders. There is no way
703 * to inform a user task about suspend or resumes.
704 */
705 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
706 {
707 return 0;
708 }
709
710 static int driver_resume(struct usb_interface *intf)
711 {
712 return 0;
713 }
714
715 struct usb_driver usbfs_driver = {
716 .name = "usbfs",
717 .probe = driver_probe,
718 .disconnect = driver_disconnect,
719 .suspend = driver_suspend,
720 .resume = driver_resume,
721 };
722
723 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
724 {
725 struct usb_device *dev = ps->dev;
726 struct usb_interface *intf;
727 int err;
728
729 if (ifnum >= 8*sizeof(ps->ifclaimed))
730 return -EINVAL;
731 /* already claimed */
732 if (test_bit(ifnum, &ps->ifclaimed))
733 return 0;
734
735 if (ps->privileges_dropped &&
736 !test_bit(ifnum, &ps->interface_allowed_mask))
737 return -EACCES;
738
739 intf = usb_ifnum_to_if(dev, ifnum);
740 if (!intf)
741 err = -ENOENT;
742 else {
743 unsigned int old_suppress;
744
745 /* suppress uevents while claiming interface */
746 old_suppress = dev_get_uevent_suppress(&intf->dev);
747 dev_set_uevent_suppress(&intf->dev, 1);
748 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
749 dev_set_uevent_suppress(&intf->dev, old_suppress);
750 }
751 if (err == 0)
752 set_bit(ifnum, &ps->ifclaimed);
753 return err;
754 }
755
756 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
757 {
758 struct usb_device *dev;
759 struct usb_interface *intf;
760 int err;
761
762 err = -EINVAL;
763 if (ifnum >= 8*sizeof(ps->ifclaimed))
764 return err;
765 dev = ps->dev;
766 intf = usb_ifnum_to_if(dev, ifnum);
767 if (!intf)
768 err = -ENOENT;
769 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
770 unsigned int old_suppress;
771
772 /* suppress uevents while releasing interface */
773 old_suppress = dev_get_uevent_suppress(&intf->dev);
774 dev_set_uevent_suppress(&intf->dev, 1);
775 usb_driver_release_interface(&usbfs_driver, intf);
776 dev_set_uevent_suppress(&intf->dev, old_suppress);
777 err = 0;
778 }
779 return err;
780 }
781
782 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
783 {
784 if (ps->dev->state != USB_STATE_CONFIGURED)
785 return -EHOSTUNREACH;
786 if (ifnum >= 8*sizeof(ps->ifclaimed))
787 return -EINVAL;
788 if (test_bit(ifnum, &ps->ifclaimed))
789 return 0;
790 /* if not yet claimed, claim it for the driver */
791 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
792 "interface %u before use\n", task_pid_nr(current),
793 current->comm, ifnum);
794 return claimintf(ps, ifnum);
795 }
796
797 static int findintfep(struct usb_device *dev, unsigned int ep)
798 {
799 unsigned int i, j, e;
800 struct usb_interface *intf;
801 struct usb_host_interface *alts;
802 struct usb_endpoint_descriptor *endpt;
803
804 if (ep & ~(USB_DIR_IN|0xf))
805 return -EINVAL;
806 if (!dev->actconfig)
807 return -ESRCH;
808 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
809 intf = dev->actconfig->interface[i];
810 for (j = 0; j < intf->num_altsetting; j++) {
811 alts = &intf->altsetting[j];
812 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
813 endpt = &alts->endpoint[e].desc;
814 if (endpt->bEndpointAddress == ep)
815 return alts->desc.bInterfaceNumber;
816 }
817 }
818 }
819 return -ENOENT;
820 }
821
822 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
823 unsigned int request, unsigned int index)
824 {
825 int ret = 0;
826 struct usb_host_interface *alt_setting;
827
828 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
829 && ps->dev->state != USB_STATE_ADDRESS
830 && ps->dev->state != USB_STATE_CONFIGURED)
831 return -EHOSTUNREACH;
832 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
833 return 0;
834
835 /*
836 * check for the special corner case 'get_device_id' in the printer
837 * class specification, which we always want to allow as it is used
838 * to query things like ink level, etc.
839 */
840 if (requesttype == 0xa1 && request == 0) {
841 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
842 index >> 8, index & 0xff);
843 if (alt_setting
844 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
845 return 0;
846 }
847
848 index &= 0xff;
849 switch (requesttype & USB_RECIP_MASK) {
850 case USB_RECIP_ENDPOINT:
851 if ((index & ~USB_DIR_IN) == 0)
852 return 0;
853 ret = findintfep(ps->dev, index);
854 if (ret < 0) {
855 /*
856 * Some not fully compliant Win apps seem to get
857 * index wrong and have the endpoint number here
858 * rather than the endpoint address (with the
859 * correct direction). Win does let this through,
860 * so we'll not reject it here but leave it to
861 * the device to not break KVM. But we warn.
862 */
863 ret = findintfep(ps->dev, index ^ 0x80);
864 if (ret >= 0)
865 dev_info(&ps->dev->dev,
866 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
867 __func__, task_pid_nr(current),
868 current->comm, index, index ^ 0x80);
869 }
870 if (ret >= 0)
871 ret = checkintf(ps, ret);
872 break;
873
874 case USB_RECIP_INTERFACE:
875 ret = checkintf(ps, index);
876 break;
877 }
878 return ret;
879 }
880
881 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
882 unsigned char ep)
883 {
884 if (ep & USB_ENDPOINT_DIR_MASK)
885 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
886 else
887 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
888 }
889
890 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
891 struct usbdevfs_streams __user *streams,
892 unsigned int *num_streams_ret,
893 unsigned int *num_eps_ret,
894 struct usb_host_endpoint ***eps_ret,
895 struct usb_interface **intf_ret)
896 {
897 unsigned int i, num_streams, num_eps;
898 struct usb_host_endpoint **eps;
899 struct usb_interface *intf = NULL;
900 unsigned char ep;
901 int ifnum, ret;
902
903 if (get_user(num_streams, &streams->num_streams) ||
904 get_user(num_eps, &streams->num_eps))
905 return -EFAULT;
906
907 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
908 return -EINVAL;
909
910 /* The XHCI controller allows max 2 ^ 16 streams */
911 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
912 return -EINVAL;
913
914 eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
915 if (!eps)
916 return -ENOMEM;
917
918 for (i = 0; i < num_eps; i++) {
919 if (get_user(ep, &streams->eps[i])) {
920 ret = -EFAULT;
921 goto error;
922 }
923 eps[i] = ep_to_host_endpoint(ps->dev, ep);
924 if (!eps[i]) {
925 ret = -EINVAL;
926 goto error;
927 }
928
929 /* usb_alloc/free_streams operate on an usb_interface */
930 ifnum = findintfep(ps->dev, ep);
931 if (ifnum < 0) {
932 ret = ifnum;
933 goto error;
934 }
935
936 if (i == 0) {
937 ret = checkintf(ps, ifnum);
938 if (ret < 0)
939 goto error;
940 intf = usb_ifnum_to_if(ps->dev, ifnum);
941 } else {
942 /* Verify all eps belong to the same interface */
943 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
944 ret = -EINVAL;
945 goto error;
946 }
947 }
948 }
949
950 if (num_streams_ret)
951 *num_streams_ret = num_streams;
952 *num_eps_ret = num_eps;
953 *eps_ret = eps;
954 *intf_ret = intf;
955
956 return 0;
957
958 error:
959 kfree(eps);
960 return ret;
961 }
962
963 static int match_devt(struct device *dev, void *data)
964 {
965 return dev->devt == (dev_t) (unsigned long) data;
966 }
967
968 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
969 {
970 struct device *dev;
971
972 dev = bus_find_device(&usb_bus_type, NULL,
973 (void *) (unsigned long) devt, match_devt);
974 if (!dev)
975 return NULL;
976 return to_usb_device(dev);
977 }
978
979 /*
980 * file operations
981 */
982 static int usbdev_open(struct inode *inode, struct file *file)
983 {
984 struct usb_device *dev = NULL;
985 struct usb_dev_state *ps;
986 int ret;
987
988 ret = -ENOMEM;
989 ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
990 if (!ps)
991 goto out_free_ps;
992
993 ret = -ENODEV;
994
995 /* Protect against simultaneous removal or release */
996 mutex_lock(&usbfs_mutex);
997
998 /* usbdev device-node */
999 if (imajor(inode) == USB_DEVICE_MAJOR)
1000 dev = usbdev_lookup_by_devt(inode->i_rdev);
1001
1002 mutex_unlock(&usbfs_mutex);
1003
1004 if (!dev)
1005 goto out_free_ps;
1006
1007 usb_lock_device(dev);
1008 if (dev->state == USB_STATE_NOTATTACHED)
1009 goto out_unlock_device;
1010
1011 ret = usb_autoresume_device(dev);
1012 if (ret)
1013 goto out_unlock_device;
1014
1015 ps->dev = dev;
1016 ps->file = file;
1017 ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1018 spin_lock_init(&ps->lock);
1019 INIT_LIST_HEAD(&ps->list);
1020 INIT_LIST_HEAD(&ps->async_pending);
1021 INIT_LIST_HEAD(&ps->async_completed);
1022 INIT_LIST_HEAD(&ps->memory_list);
1023 init_waitqueue_head(&ps->wait);
1024 ps->disc_pid = get_pid(task_pid(current));
1025 ps->cred = get_current_cred();
1026 smp_wmb();
1027 list_add_tail(&ps->list, &dev->filelist);
1028 file->private_data = ps;
1029 usb_unlock_device(dev);
1030 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1031 current->comm);
1032 return ret;
1033
1034 out_unlock_device:
1035 usb_unlock_device(dev);
1036 usb_put_dev(dev);
1037 out_free_ps:
1038 kfree(ps);
1039 return ret;
1040 }
1041
1042 static int usbdev_release(struct inode *inode, struct file *file)
1043 {
1044 struct usb_dev_state *ps = file->private_data;
1045 struct usb_device *dev = ps->dev;
1046 unsigned int ifnum;
1047 struct async *as;
1048
1049 usb_lock_device(dev);
1050 usb_hub_release_all_ports(dev, ps);
1051
1052 list_del_init(&ps->list);
1053
1054 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1055 ifnum++) {
1056 if (test_bit(ifnum, &ps->ifclaimed))
1057 releaseintf(ps, ifnum);
1058 }
1059 destroy_all_async(ps);
1060 usb_autosuspend_device(dev);
1061 usb_unlock_device(dev);
1062 usb_put_dev(dev);
1063 put_pid(ps->disc_pid);
1064 put_cred(ps->cred);
1065
1066 as = async_getcompleted(ps);
1067 while (as) {
1068 free_async(as);
1069 as = async_getcompleted(ps);
1070 }
1071
1072 kfree(ps);
1073 return 0;
1074 }
1075
1076 static int proc_control(struct usb_dev_state *ps, void __user *arg)
1077 {
1078 struct usb_device *dev = ps->dev;
1079 struct usbdevfs_ctrltransfer ctrl;
1080 unsigned int tmo;
1081 unsigned char *tbuf;
1082 unsigned wLength;
1083 int i, pipe, ret;
1084
1085 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1086 return -EFAULT;
1087 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
1088 ctrl.wIndex);
1089 if (ret)
1090 return ret;
1091 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
1092 if (wLength > PAGE_SIZE)
1093 return -EINVAL;
1094 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1095 sizeof(struct usb_ctrlrequest));
1096 if (ret)
1097 return ret;
1098 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1099 if (!tbuf) {
1100 ret = -ENOMEM;
1101 goto done;
1102 }
1103 tmo = ctrl.timeout;
1104 snoop(&dev->dev, "control urb: bRequestType=%02x "
1105 "bRequest=%02x wValue=%04x "
1106 "wIndex=%04x wLength=%04x\n",
1107 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1108 ctrl.wIndex, ctrl.wLength);
1109 if (ctrl.bRequestType & 0x80) {
1110 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
1111 ctrl.wLength)) {
1112 ret = -EINVAL;
1113 goto done;
1114 }
1115 pipe = usb_rcvctrlpipe(dev, 0);
1116 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1117
1118 usb_unlock_device(dev);
1119 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1120 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1121 tbuf, ctrl.wLength, tmo);
1122 usb_lock_device(dev);
1123 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1124 tbuf, max(i, 0));
1125 if ((i > 0) && ctrl.wLength) {
1126 if (copy_to_user(ctrl.data, tbuf, i)) {
1127 ret = -EFAULT;
1128 goto done;
1129 }
1130 }
1131 } else {
1132 if (ctrl.wLength) {
1133 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1134 ret = -EFAULT;
1135 goto done;
1136 }
1137 }
1138 pipe = usb_sndctrlpipe(dev, 0);
1139 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1140 tbuf, ctrl.wLength);
1141
1142 usb_unlock_device(dev);
1143 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1144 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1145 tbuf, ctrl.wLength, tmo);
1146 usb_lock_device(dev);
1147 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1148 }
1149 if (i < 0 && i != -EPIPE) {
1150 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1151 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1152 current->comm, ctrl.bRequestType, ctrl.bRequest,
1153 ctrl.wLength, i);
1154 }
1155 ret = i;
1156 done:
1157 free_page((unsigned long) tbuf);
1158 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1159 sizeof(struct usb_ctrlrequest));
1160 return ret;
1161 }
1162
1163 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1164 {
1165 struct usb_device *dev = ps->dev;
1166 struct usbdevfs_bulktransfer bulk;
1167 unsigned int tmo, len1, pipe;
1168 int len2;
1169 unsigned char *tbuf;
1170 int i, ret;
1171
1172 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1173 return -EFAULT;
1174 ret = findintfep(ps->dev, bulk.ep);
1175 if (ret < 0)
1176 return ret;
1177 ret = checkintf(ps, ret);
1178 if (ret)
1179 return ret;
1180 if (bulk.ep & USB_DIR_IN)
1181 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1182 else
1183 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1184 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1185 return -EINVAL;
1186 len1 = bulk.len;
1187 if (len1 >= (INT_MAX - sizeof(struct urb)))
1188 return -EINVAL;
1189 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1190 if (ret)
1191 return ret;
1192 tbuf = kmalloc(len1, GFP_KERNEL);
1193 if (!tbuf) {
1194 ret = -ENOMEM;
1195 goto done;
1196 }
1197 tmo = bulk.timeout;
1198 if (bulk.ep & 0x80) {
1199 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1200 ret = -EINVAL;
1201 goto done;
1202 }
1203 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1204
1205 usb_unlock_device(dev);
1206 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1207 usb_lock_device(dev);
1208 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1209
1210 if (!i && len2) {
1211 if (copy_to_user(bulk.data, tbuf, len2)) {
1212 ret = -EFAULT;
1213 goto done;
1214 }
1215 }
1216 } else {
1217 if (len1) {
1218 if (copy_from_user(tbuf, bulk.data, len1)) {
1219 ret = -EFAULT;
1220 goto done;
1221 }
1222 }
1223 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1224
1225 usb_unlock_device(dev);
1226 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1227 usb_lock_device(dev);
1228 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1229 }
1230 ret = (i < 0 ? i : len2);
1231 done:
1232 kfree(tbuf);
1233 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1234 return ret;
1235 }
1236
1237 static void check_reset_of_active_ep(struct usb_device *udev,
1238 unsigned int epnum, char *ioctl_name)
1239 {
1240 struct usb_host_endpoint **eps;
1241 struct usb_host_endpoint *ep;
1242
1243 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1244 ep = eps[epnum & 0x0f];
1245 if (ep && !list_empty(&ep->urb_list))
1246 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1247 task_pid_nr(current), current->comm,
1248 ioctl_name, epnum);
1249 }
1250
1251 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1252 {
1253 unsigned int ep;
1254 int ret;
1255
1256 if (get_user(ep, (unsigned int __user *)arg))
1257 return -EFAULT;
1258 ret = findintfep(ps->dev, ep);
1259 if (ret < 0)
1260 return ret;
1261 ret = checkintf(ps, ret);
1262 if (ret)
1263 return ret;
1264 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1265 usb_reset_endpoint(ps->dev, ep);
1266 return 0;
1267 }
1268
1269 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1270 {
1271 unsigned int ep;
1272 int pipe;
1273 int ret;
1274
1275 if (get_user(ep, (unsigned int __user *)arg))
1276 return -EFAULT;
1277 ret = findintfep(ps->dev, ep);
1278 if (ret < 0)
1279 return ret;
1280 ret = checkintf(ps, ret);
1281 if (ret)
1282 return ret;
1283 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1284 if (ep & USB_DIR_IN)
1285 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1286 else
1287 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1288
1289 return usb_clear_halt(ps->dev, pipe);
1290 }
1291
1292 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1293 {
1294 struct usbdevfs_getdriver gd;
1295 struct usb_interface *intf;
1296 int ret;
1297
1298 if (copy_from_user(&gd, arg, sizeof(gd)))
1299 return -EFAULT;
1300 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1301 if (!intf || !intf->dev.driver)
1302 ret = -ENODATA;
1303 else {
1304 strlcpy(gd.driver, intf->dev.driver->name,
1305 sizeof(gd.driver));
1306 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1307 }
1308 return ret;
1309 }
1310
1311 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1312 {
1313 struct usbdevfs_connectinfo ci;
1314
1315 memset(&ci, 0, sizeof(ci));
1316 ci.devnum = ps->dev->devnum;
1317 ci.slow = ps->dev->speed == USB_SPEED_LOW;
1318
1319 if (copy_to_user(arg, &ci, sizeof(ci)))
1320 return -EFAULT;
1321 return 0;
1322 }
1323
1324 static int proc_resetdevice(struct usb_dev_state *ps)
1325 {
1326 struct usb_host_config *actconfig = ps->dev->actconfig;
1327 struct usb_interface *interface;
1328 int i, number;
1329
1330 /* Don't allow a device reset if the process has dropped the
1331 * privilege to do such things and any of the interfaces are
1332 * currently claimed.
1333 */
1334 if (ps->privileges_dropped && actconfig) {
1335 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1336 interface = actconfig->interface[i];
1337 number = interface->cur_altsetting->desc.bInterfaceNumber;
1338 if (usb_interface_claimed(interface) &&
1339 !test_bit(number, &ps->ifclaimed)) {
1340 dev_warn(&ps->dev->dev,
1341 "usbfs: interface %d claimed by %s while '%s' resets device\n",
1342 number, interface->dev.driver->name, current->comm);
1343 return -EACCES;
1344 }
1345 }
1346 }
1347
1348 return usb_reset_device(ps->dev);
1349 }
1350
1351 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1352 {
1353 struct usbdevfs_setinterface setintf;
1354 int ret;
1355
1356 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1357 return -EFAULT;
1358 ret = checkintf(ps, setintf.interface);
1359 if (ret)
1360 return ret;
1361
1362 destroy_async_on_interface(ps, setintf.interface);
1363
1364 return usb_set_interface(ps->dev, setintf.interface,
1365 setintf.altsetting);
1366 }
1367
1368 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1369 {
1370 int u;
1371 int status = 0;
1372 struct usb_host_config *actconfig;
1373
1374 if (get_user(u, (int __user *)arg))
1375 return -EFAULT;
1376
1377 actconfig = ps->dev->actconfig;
1378
1379 /* Don't touch the device if any interfaces are claimed.
1380 * It could interfere with other drivers' operations, and if
1381 * an interface is claimed by usbfs it could easily deadlock.
1382 */
1383 if (actconfig) {
1384 int i;
1385
1386 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1387 if (usb_interface_claimed(actconfig->interface[i])) {
1388 dev_warn(&ps->dev->dev,
1389 "usbfs: interface %d claimed by %s "
1390 "while '%s' sets config #%d\n",
1391 actconfig->interface[i]
1392 ->cur_altsetting
1393 ->desc.bInterfaceNumber,
1394 actconfig->interface[i]
1395 ->dev.driver->name,
1396 current->comm, u);
1397 status = -EBUSY;
1398 break;
1399 }
1400 }
1401 }
1402
1403 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1404 * so avoid usb_set_configuration()'s kick to sysfs
1405 */
1406 if (status == 0) {
1407 if (actconfig && actconfig->desc.bConfigurationValue == u)
1408 status = usb_reset_configuration(ps->dev);
1409 else
1410 status = usb_set_configuration(ps->dev, u);
1411 }
1412
1413 return status;
1414 }
1415
1416 static struct usb_memory *
1417 find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1418 {
1419 struct usb_memory *usbm = NULL, *iter;
1420 unsigned long flags;
1421 unsigned long uurb_start = (unsigned long)uurb->buffer;
1422
1423 spin_lock_irqsave(&ps->lock, flags);
1424 list_for_each_entry(iter, &ps->memory_list, memlist) {
1425 if (uurb_start >= iter->vm_start &&
1426 uurb_start < iter->vm_start + iter->size) {
1427 if (uurb->buffer_length > iter->vm_start + iter->size -
1428 uurb_start) {
1429 usbm = ERR_PTR(-EINVAL);
1430 } else {
1431 usbm = iter;
1432 usbm->urb_use_count++;
1433 }
1434 break;
1435 }
1436 }
1437 spin_unlock_irqrestore(&ps->lock, flags);
1438 return usbm;
1439 }
1440
1441 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1442 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1443 void __user *arg)
1444 {
1445 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1446 struct usb_host_endpoint *ep;
1447 struct async *as = NULL;
1448 struct usb_ctrlrequest *dr = NULL;
1449 unsigned int u, totlen, isofrmlen;
1450 int i, ret, num_sgs = 0, ifnum = -1;
1451 int number_of_packets = 0;
1452 unsigned int stream_id = 0;
1453 void *buf;
1454 bool is_in;
1455 bool allow_short = false;
1456 bool allow_zero = false;
1457 unsigned long mask = USBDEVFS_URB_SHORT_NOT_OK |
1458 USBDEVFS_URB_BULK_CONTINUATION |
1459 USBDEVFS_URB_NO_FSBR |
1460 USBDEVFS_URB_ZERO_PACKET |
1461 USBDEVFS_URB_NO_INTERRUPT;
1462 /* USBDEVFS_URB_ISO_ASAP is a special case */
1463 if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1464 mask |= USBDEVFS_URB_ISO_ASAP;
1465
1466 if (uurb->flags & ~mask)
1467 return -EINVAL;
1468
1469 if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1470 return -EINVAL;
1471 if (uurb->buffer_length > 0 && !uurb->buffer)
1472 return -EINVAL;
1473 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1474 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1475 ifnum = findintfep(ps->dev, uurb->endpoint);
1476 if (ifnum < 0)
1477 return ifnum;
1478 ret = checkintf(ps, ifnum);
1479 if (ret)
1480 return ret;
1481 }
1482 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1483 if (!ep)
1484 return -ENOENT;
1485 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1486
1487 u = 0;
1488 switch (uurb->type) {
1489 case USBDEVFS_URB_TYPE_CONTROL:
1490 if (!usb_endpoint_xfer_control(&ep->desc))
1491 return -EINVAL;
1492 /* min 8 byte setup packet */
1493 if (uurb->buffer_length < 8)
1494 return -EINVAL;
1495 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1496 if (!dr)
1497 return -ENOMEM;
1498 if (copy_from_user(dr, uurb->buffer, 8)) {
1499 ret = -EFAULT;
1500 goto error;
1501 }
1502 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1503 ret = -EINVAL;
1504 goto error;
1505 }
1506 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1507 le16_to_cpup(&dr->wIndex));
1508 if (ret)
1509 goto error;
1510 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1511 uurb->buffer += 8;
1512 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1513 is_in = 1;
1514 uurb->endpoint |= USB_DIR_IN;
1515 } else {
1516 is_in = 0;
1517 uurb->endpoint &= ~USB_DIR_IN;
1518 }
1519 if (is_in)
1520 allow_short = true;
1521 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1522 "bRequest=%02x wValue=%04x "
1523 "wIndex=%04x wLength=%04x\n",
1524 dr->bRequestType, dr->bRequest,
1525 __le16_to_cpup(&dr->wValue),
1526 __le16_to_cpup(&dr->wIndex),
1527 __le16_to_cpup(&dr->wLength));
1528 u = sizeof(struct usb_ctrlrequest);
1529 break;
1530
1531 case USBDEVFS_URB_TYPE_BULK:
1532 if (!is_in)
1533 allow_zero = true;
1534 else
1535 allow_short = true;
1536 switch (usb_endpoint_type(&ep->desc)) {
1537 case USB_ENDPOINT_XFER_CONTROL:
1538 case USB_ENDPOINT_XFER_ISOC:
1539 return -EINVAL;
1540 case USB_ENDPOINT_XFER_INT:
1541 /* allow single-shot interrupt transfers */
1542 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1543 goto interrupt_urb;
1544 }
1545 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1546 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1547 num_sgs = 0;
1548 if (ep->streams)
1549 stream_id = uurb->stream_id;
1550 break;
1551
1552 case USBDEVFS_URB_TYPE_INTERRUPT:
1553 if (!usb_endpoint_xfer_int(&ep->desc))
1554 return -EINVAL;
1555 interrupt_urb:
1556 if (!is_in)
1557 allow_zero = true;
1558 else
1559 allow_short = true;
1560 break;
1561
1562 case USBDEVFS_URB_TYPE_ISO:
1563 /* arbitrary limit */
1564 if (uurb->number_of_packets < 1 ||
1565 uurb->number_of_packets > 128)
1566 return -EINVAL;
1567 if (!usb_endpoint_xfer_isoc(&ep->desc))
1568 return -EINVAL;
1569 number_of_packets = uurb->number_of_packets;
1570 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1571 number_of_packets;
1572 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1573 if (IS_ERR(isopkt)) {
1574 ret = PTR_ERR(isopkt);
1575 isopkt = NULL;
1576 goto error;
1577 }
1578 for (totlen = u = 0; u < number_of_packets; u++) {
1579 /*
1580 * arbitrary limit need for USB 3.0
1581 * bMaxBurst (0~15 allowed, 1~16 packets)
1582 * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1583 * sizemax: 1024 * 16 * 3 = 49152
1584 */
1585 if (isopkt[u].length > 49152) {
1586 ret = -EINVAL;
1587 goto error;
1588 }
1589 totlen += isopkt[u].length;
1590 }
1591 u *= sizeof(struct usb_iso_packet_descriptor);
1592 uurb->buffer_length = totlen;
1593 break;
1594
1595 default:
1596 return -EINVAL;
1597 }
1598
1599 if (uurb->buffer_length > 0 &&
1600 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1601 uurb->buffer, uurb->buffer_length)) {
1602 ret = -EFAULT;
1603 goto error;
1604 }
1605 as = alloc_async(number_of_packets);
1606 if (!as) {
1607 ret = -ENOMEM;
1608 goto error;
1609 }
1610
1611 as->usbm = find_memory_area(ps, uurb);
1612 if (IS_ERR(as->usbm)) {
1613 ret = PTR_ERR(as->usbm);
1614 as->usbm = NULL;
1615 goto error;
1616 }
1617
1618 /* do not use SG buffers when memory mapped segments
1619 * are in use
1620 */
1621 if (as->usbm)
1622 num_sgs = 0;
1623
1624 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1625 num_sgs * sizeof(struct scatterlist);
1626 ret = usbfs_increase_memory_usage(u);
1627 if (ret)
1628 goto error;
1629 as->mem_usage = u;
1630
1631 if (num_sgs) {
1632 as->urb->sg = kmalloc_array(num_sgs,
1633 sizeof(struct scatterlist),
1634 GFP_KERNEL);
1635 if (!as->urb->sg) {
1636 ret = -ENOMEM;
1637 goto error;
1638 }
1639 as->urb->num_sgs = num_sgs;
1640 sg_init_table(as->urb->sg, as->urb->num_sgs);
1641
1642 totlen = uurb->buffer_length;
1643 for (i = 0; i < as->urb->num_sgs; i++) {
1644 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1645 buf = kmalloc(u, GFP_KERNEL);
1646 if (!buf) {
1647 ret = -ENOMEM;
1648 goto error;
1649 }
1650 sg_set_buf(&as->urb->sg[i], buf, u);
1651
1652 if (!is_in) {
1653 if (copy_from_user(buf, uurb->buffer, u)) {
1654 ret = -EFAULT;
1655 goto error;
1656 }
1657 uurb->buffer += u;
1658 }
1659 totlen -= u;
1660 }
1661 } else if (uurb->buffer_length > 0) {
1662 if (as->usbm) {
1663 unsigned long uurb_start = (unsigned long)uurb->buffer;
1664
1665 as->urb->transfer_buffer = as->usbm->mem +
1666 (uurb_start - as->usbm->vm_start);
1667 } else {
1668 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1669 GFP_KERNEL);
1670 if (!as->urb->transfer_buffer) {
1671 ret = -ENOMEM;
1672 goto error;
1673 }
1674 if (!is_in) {
1675 if (copy_from_user(as->urb->transfer_buffer,
1676 uurb->buffer,
1677 uurb->buffer_length)) {
1678 ret = -EFAULT;
1679 goto error;
1680 }
1681 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1682 /*
1683 * Isochronous input data may end up being
1684 * discontiguous if some of the packets are
1685 * short. Clear the buffer so that the gaps
1686 * don't leak kernel data to userspace.
1687 */
1688 memset(as->urb->transfer_buffer, 0,
1689 uurb->buffer_length);
1690 }
1691 }
1692 }
1693 as->urb->dev = ps->dev;
1694 as->urb->pipe = (uurb->type << 30) |
1695 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1696 (uurb->endpoint & USB_DIR_IN);
1697
1698 /* This tedious sequence is necessary because the URB_* flags
1699 * are internal to the kernel and subject to change, whereas
1700 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1701 */
1702 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1703 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1704 u |= URB_ISO_ASAP;
1705 if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1706 u |= URB_SHORT_NOT_OK;
1707 if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1708 u |= URB_ZERO_PACKET;
1709 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1710 u |= URB_NO_INTERRUPT;
1711 as->urb->transfer_flags = u;
1712
1713 if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1714 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1715 if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1716 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1717
1718 as->urb->transfer_buffer_length = uurb->buffer_length;
1719 as->urb->setup_packet = (unsigned char *)dr;
1720 dr = NULL;
1721 as->urb->start_frame = uurb->start_frame;
1722 as->urb->number_of_packets = number_of_packets;
1723 as->urb->stream_id = stream_id;
1724
1725 if (ep->desc.bInterval) {
1726 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1727 ps->dev->speed == USB_SPEED_HIGH ||
1728 ps->dev->speed >= USB_SPEED_SUPER)
1729 as->urb->interval = 1 <<
1730 min(15, ep->desc.bInterval - 1);
1731 else
1732 as->urb->interval = ep->desc.bInterval;
1733 }
1734
1735 as->urb->context = as;
1736 as->urb->complete = async_completed;
1737 for (totlen = u = 0; u < number_of_packets; u++) {
1738 as->urb->iso_frame_desc[u].offset = totlen;
1739 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1740 totlen += isopkt[u].length;
1741 }
1742 kfree(isopkt);
1743 isopkt = NULL;
1744 as->ps = ps;
1745 as->userurb = arg;
1746 if (as->usbm) {
1747 unsigned long uurb_start = (unsigned long)uurb->buffer;
1748
1749 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1750 as->urb->transfer_dma = as->usbm->dma_handle +
1751 (uurb_start - as->usbm->vm_start);
1752 } else if (is_in && uurb->buffer_length > 0)
1753 as->userbuffer = uurb->buffer;
1754 as->signr = uurb->signr;
1755 as->ifnum = ifnum;
1756 as->pid = get_pid(task_pid(current));
1757 as->cred = get_current_cred();
1758 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1759 as->urb->transfer_buffer_length, 0, SUBMIT,
1760 NULL, 0);
1761 if (!is_in)
1762 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1763
1764 async_newpending(as);
1765
1766 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1767 spin_lock_irq(&ps->lock);
1768
1769 /* Not exactly the endpoint address; the direction bit is
1770 * shifted to the 0x10 position so that the value will be
1771 * between 0 and 31.
1772 */
1773 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1774 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1775 >> 3);
1776
1777 /* If this bulk URB is the start of a new transfer, re-enable
1778 * the endpoint. Otherwise mark it as a continuation URB.
1779 */
1780 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1781 as->bulk_status = AS_CONTINUATION;
1782 else
1783 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1784
1785 /* Don't accept continuation URBs if the endpoint is
1786 * disabled because of an earlier error.
1787 */
1788 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1789 ret = -EREMOTEIO;
1790 else
1791 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1792 spin_unlock_irq(&ps->lock);
1793 } else {
1794 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1795 }
1796
1797 if (ret) {
1798 dev_printk(KERN_DEBUG, &ps->dev->dev,
1799 "usbfs: usb_submit_urb returned %d\n", ret);
1800 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1801 0, ret, COMPLETE, NULL, 0);
1802 async_removepending(as);
1803 goto error;
1804 }
1805 return 0;
1806
1807 error:
1808 kfree(isopkt);
1809 kfree(dr);
1810 if (as)
1811 free_async(as);
1812 return ret;
1813 }
1814
1815 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1816 {
1817 struct usbdevfs_urb uurb;
1818
1819 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1820 return -EFAULT;
1821
1822 return proc_do_submiturb(ps, &uurb,
1823 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1824 arg);
1825 }
1826
1827 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1828 {
1829 struct urb *urb;
1830 struct async *as;
1831 unsigned long flags;
1832
1833 spin_lock_irqsave(&ps->lock, flags);
1834 as = async_getpending(ps, arg);
1835 if (!as) {
1836 spin_unlock_irqrestore(&ps->lock, flags);
1837 return -EINVAL;
1838 }
1839
1840 urb = as->urb;
1841 usb_get_urb(urb);
1842 spin_unlock_irqrestore(&ps->lock, flags);
1843
1844 usb_kill_urb(urb);
1845 usb_put_urb(urb);
1846
1847 return 0;
1848 }
1849
1850 static void compute_isochronous_actual_length(struct urb *urb)
1851 {
1852 unsigned int i;
1853
1854 if (urb->number_of_packets > 0) {
1855 urb->actual_length = 0;
1856 for (i = 0; i < urb->number_of_packets; i++)
1857 urb->actual_length +=
1858 urb->iso_frame_desc[i].actual_length;
1859 }
1860 }
1861
1862 static int processcompl(struct async *as, void __user * __user *arg)
1863 {
1864 struct urb *urb = as->urb;
1865 struct usbdevfs_urb __user *userurb = as->userurb;
1866 void __user *addr = as->userurb;
1867 unsigned int i;
1868
1869 compute_isochronous_actual_length(urb);
1870 if (as->userbuffer && urb->actual_length) {
1871 if (copy_urb_data_to_user(as->userbuffer, urb))
1872 goto err_out;
1873 }
1874 if (put_user(as->status, &userurb->status))
1875 goto err_out;
1876 if (put_user(urb->actual_length, &userurb->actual_length))
1877 goto err_out;
1878 if (put_user(urb->error_count, &userurb->error_count))
1879 goto err_out;
1880
1881 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1882 for (i = 0; i < urb->number_of_packets; i++) {
1883 if (put_user(urb->iso_frame_desc[i].actual_length,
1884 &userurb->iso_frame_desc[i].actual_length))
1885 goto err_out;
1886 if (put_user(urb->iso_frame_desc[i].status,
1887 &userurb->iso_frame_desc[i].status))
1888 goto err_out;
1889 }
1890 }
1891
1892 if (put_user(addr, (void __user * __user *)arg))
1893 return -EFAULT;
1894 return 0;
1895
1896 err_out:
1897 return -EFAULT;
1898 }
1899
1900 static struct async *reap_as(struct usb_dev_state *ps)
1901 {
1902 DECLARE_WAITQUEUE(wait, current);
1903 struct async *as = NULL;
1904 struct usb_device *dev = ps->dev;
1905
1906 add_wait_queue(&ps->wait, &wait);
1907 for (;;) {
1908 __set_current_state(TASK_INTERRUPTIBLE);
1909 as = async_getcompleted(ps);
1910 if (as || !connected(ps))
1911 break;
1912 if (signal_pending(current))
1913 break;
1914 usb_unlock_device(dev);
1915 schedule();
1916 usb_lock_device(dev);
1917 }
1918 remove_wait_queue(&ps->wait, &wait);
1919 set_current_state(TASK_RUNNING);
1920 return as;
1921 }
1922
1923 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1924 {
1925 struct async *as = reap_as(ps);
1926
1927 if (as) {
1928 int retval;
1929
1930 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
1931 retval = processcompl(as, (void __user * __user *)arg);
1932 free_async(as);
1933 return retval;
1934 }
1935 if (signal_pending(current))
1936 return -EINTR;
1937 return -ENODEV;
1938 }
1939
1940 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1941 {
1942 int retval;
1943 struct async *as;
1944
1945 as = async_getcompleted(ps);
1946 if (as) {
1947 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
1948 retval = processcompl(as, (void __user * __user *)arg);
1949 free_async(as);
1950 } else {
1951 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1952 }
1953 return retval;
1954 }
1955
1956 #ifdef CONFIG_COMPAT
1957 static int proc_control_compat(struct usb_dev_state *ps,
1958 struct usbdevfs_ctrltransfer32 __user *p32)
1959 {
1960 struct usbdevfs_ctrltransfer __user *p;
1961 __u32 udata;
1962 p = compat_alloc_user_space(sizeof(*p));
1963 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1964 get_user(udata, &p32->data) ||
1965 put_user(compat_ptr(udata), &p->data))
1966 return -EFAULT;
1967 return proc_control(ps, p);
1968 }
1969
1970 static int proc_bulk_compat(struct usb_dev_state *ps,
1971 struct usbdevfs_bulktransfer32 __user *p32)
1972 {
1973 struct usbdevfs_bulktransfer __user *p;
1974 compat_uint_t n;
1975 compat_caddr_t addr;
1976
1977 p = compat_alloc_user_space(sizeof(*p));
1978
1979 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1980 get_user(n, &p32->len) || put_user(n, &p->len) ||
1981 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1982 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1983 return -EFAULT;
1984
1985 return proc_bulk(ps, p);
1986 }
1987 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1988 {
1989 struct usbdevfs_disconnectsignal32 ds;
1990
1991 if (copy_from_user(&ds, arg, sizeof(ds)))
1992 return -EFAULT;
1993 ps->discsignr = ds.signr;
1994 ps->disccontext = compat_ptr(ds.context);
1995 return 0;
1996 }
1997
1998 static int get_urb32(struct usbdevfs_urb *kurb,
1999 struct usbdevfs_urb32 __user *uurb)
2000 {
2001 struct usbdevfs_urb32 urb32;
2002 if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
2003 return -EFAULT;
2004 kurb->type = urb32.type;
2005 kurb->endpoint = urb32.endpoint;
2006 kurb->status = urb32.status;
2007 kurb->flags = urb32.flags;
2008 kurb->buffer = compat_ptr(urb32.buffer);
2009 kurb->buffer_length = urb32.buffer_length;
2010 kurb->actual_length = urb32.actual_length;
2011 kurb->start_frame = urb32.start_frame;
2012 kurb->number_of_packets = urb32.number_of_packets;
2013 kurb->error_count = urb32.error_count;
2014 kurb->signr = urb32.signr;
2015 kurb->usercontext = compat_ptr(urb32.usercontext);
2016 return 0;
2017 }
2018
2019 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2020 {
2021 struct usbdevfs_urb uurb;
2022
2023 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2024 return -EFAULT;
2025
2026 return proc_do_submiturb(ps, &uurb,
2027 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2028 arg);
2029 }
2030
2031 static int processcompl_compat(struct async *as, void __user * __user *arg)
2032 {
2033 struct urb *urb = as->urb;
2034 struct usbdevfs_urb32 __user *userurb = as->userurb;
2035 void __user *addr = as->userurb;
2036 unsigned int i;
2037
2038 compute_isochronous_actual_length(urb);
2039 if (as->userbuffer && urb->actual_length) {
2040 if (copy_urb_data_to_user(as->userbuffer, urb))
2041 return -EFAULT;
2042 }
2043 if (put_user(as->status, &userurb->status))
2044 return -EFAULT;
2045 if (put_user(urb->actual_length, &userurb->actual_length))
2046 return -EFAULT;
2047 if (put_user(urb->error_count, &userurb->error_count))
2048 return -EFAULT;
2049
2050 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2051 for (i = 0; i < urb->number_of_packets; i++) {
2052 if (put_user(urb->iso_frame_desc[i].actual_length,
2053 &userurb->iso_frame_desc[i].actual_length))
2054 return -EFAULT;
2055 if (put_user(urb->iso_frame_desc[i].status,
2056 &userurb->iso_frame_desc[i].status))
2057 return -EFAULT;
2058 }
2059 }
2060
2061 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2062 return -EFAULT;
2063 return 0;
2064 }
2065
2066 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2067 {
2068 struct async *as = reap_as(ps);
2069
2070 if (as) {
2071 int retval;
2072
2073 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2074 retval = processcompl_compat(as, (void __user * __user *)arg);
2075 free_async(as);
2076 return retval;
2077 }
2078 if (signal_pending(current))
2079 return -EINTR;
2080 return -ENODEV;
2081 }
2082
2083 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2084 {
2085 int retval;
2086 struct async *as;
2087
2088 as = async_getcompleted(ps);
2089 if (as) {
2090 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2091 retval = processcompl_compat(as, (void __user * __user *)arg);
2092 free_async(as);
2093 } else {
2094 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2095 }
2096 return retval;
2097 }
2098
2099
2100 #endif
2101
2102 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2103 {
2104 struct usbdevfs_disconnectsignal ds;
2105
2106 if (copy_from_user(&ds, arg, sizeof(ds)))
2107 return -EFAULT;
2108 ps->discsignr = ds.signr;
2109 ps->disccontext = ds.context;
2110 return 0;
2111 }
2112
2113 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2114 {
2115 unsigned int ifnum;
2116
2117 if (get_user(ifnum, (unsigned int __user *)arg))
2118 return -EFAULT;
2119 return claimintf(ps, ifnum);
2120 }
2121
2122 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2123 {
2124 unsigned int ifnum;
2125 int ret;
2126
2127 if (get_user(ifnum, (unsigned int __user *)arg))
2128 return -EFAULT;
2129 ret = releaseintf(ps, ifnum);
2130 if (ret < 0)
2131 return ret;
2132 destroy_async_on_interface(ps, ifnum);
2133 return 0;
2134 }
2135
2136 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2137 {
2138 int size;
2139 void *buf = NULL;
2140 int retval = 0;
2141 struct usb_interface *intf = NULL;
2142 struct usb_driver *driver = NULL;
2143
2144 if (ps->privileges_dropped)
2145 return -EACCES;
2146
2147 /* alloc buffer */
2148 size = _IOC_SIZE(ctl->ioctl_code);
2149 if (size > 0) {
2150 buf = kmalloc(size, GFP_KERNEL);
2151 if (buf == NULL)
2152 return -ENOMEM;
2153 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2154 if (copy_from_user(buf, ctl->data, size)) {
2155 kfree(buf);
2156 return -EFAULT;
2157 }
2158 } else {
2159 memset(buf, 0, size);
2160 }
2161 }
2162
2163 if (!connected(ps)) {
2164 kfree(buf);
2165 return -ENODEV;
2166 }
2167
2168 if (ps->dev->state != USB_STATE_CONFIGURED)
2169 retval = -EHOSTUNREACH;
2170 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2171 retval = -EINVAL;
2172 else switch (ctl->ioctl_code) {
2173
2174 /* disconnect kernel driver from interface */
2175 case USBDEVFS_DISCONNECT:
2176 if (intf->dev.driver) {
2177 driver = to_usb_driver(intf->dev.driver);
2178 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2179 usb_driver_release_interface(driver, intf);
2180 } else
2181 retval = -ENODATA;
2182 break;
2183
2184 /* let kernel drivers try to (re)bind to the interface */
2185 case USBDEVFS_CONNECT:
2186 if (!intf->dev.driver)
2187 retval = device_attach(&intf->dev);
2188 else
2189 retval = -EBUSY;
2190 break;
2191
2192 /* talk directly to the interface's driver */
2193 default:
2194 if (intf->dev.driver)
2195 driver = to_usb_driver(intf->dev.driver);
2196 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2197 retval = -ENOTTY;
2198 } else {
2199 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2200 if (retval == -ENOIOCTLCMD)
2201 retval = -ENOTTY;
2202 }
2203 }
2204
2205 /* cleanup and return */
2206 if (retval >= 0
2207 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2208 && size > 0
2209 && copy_to_user(ctl->data, buf, size) != 0)
2210 retval = -EFAULT;
2211
2212 kfree(buf);
2213 return retval;
2214 }
2215
2216 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2217 {
2218 struct usbdevfs_ioctl ctrl;
2219
2220 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2221 return -EFAULT;
2222 return proc_ioctl(ps, &ctrl);
2223 }
2224
2225 #ifdef CONFIG_COMPAT
2226 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2227 {
2228 struct usbdevfs_ioctl32 ioc32;
2229 struct usbdevfs_ioctl ctrl;
2230
2231 if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2232 return -EFAULT;
2233 ctrl.ifno = ioc32.ifno;
2234 ctrl.ioctl_code = ioc32.ioctl_code;
2235 ctrl.data = compat_ptr(ioc32.data);
2236 return proc_ioctl(ps, &ctrl);
2237 }
2238 #endif
2239
2240 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2241 {
2242 unsigned portnum;
2243 int rc;
2244
2245 if (get_user(portnum, (unsigned __user *) arg))
2246 return -EFAULT;
2247 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2248 if (rc == 0)
2249 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2250 portnum, task_pid_nr(current), current->comm);
2251 return rc;
2252 }
2253
2254 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2255 {
2256 unsigned portnum;
2257
2258 if (get_user(portnum, (unsigned __user *) arg))
2259 return -EFAULT;
2260 return usb_hub_release_port(ps->dev, portnum, ps);
2261 }
2262
2263 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2264 {
2265 __u32 caps;
2266
2267 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2268 USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2269 USBDEVFS_CAP_DROP_PRIVILEGES;
2270 if (!ps->dev->bus->no_stop_on_short)
2271 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2272 if (ps->dev->bus->sg_tablesize)
2273 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2274
2275 if (put_user(caps, (__u32 __user *)arg))
2276 return -EFAULT;
2277
2278 return 0;
2279 }
2280
2281 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2282 {
2283 struct usbdevfs_disconnect_claim dc;
2284 struct usb_interface *intf;
2285
2286 if (copy_from_user(&dc, arg, sizeof(dc)))
2287 return -EFAULT;
2288
2289 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2290 if (!intf)
2291 return -EINVAL;
2292
2293 if (intf->dev.driver) {
2294 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2295
2296 if (ps->privileges_dropped)
2297 return -EACCES;
2298
2299 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2300 strncmp(dc.driver, intf->dev.driver->name,
2301 sizeof(dc.driver)) != 0)
2302 return -EBUSY;
2303
2304 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2305 strncmp(dc.driver, intf->dev.driver->name,
2306 sizeof(dc.driver)) == 0)
2307 return -EBUSY;
2308
2309 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2310 usb_driver_release_interface(driver, intf);
2311 }
2312
2313 return claimintf(ps, dc.interface);
2314 }
2315
2316 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2317 {
2318 unsigned num_streams, num_eps;
2319 struct usb_host_endpoint **eps;
2320 struct usb_interface *intf;
2321 int r;
2322
2323 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2324 &eps, &intf);
2325 if (r)
2326 return r;
2327
2328 destroy_async_on_interface(ps,
2329 intf->altsetting[0].desc.bInterfaceNumber);
2330
2331 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2332 kfree(eps);
2333 return r;
2334 }
2335
2336 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2337 {
2338 unsigned num_eps;
2339 struct usb_host_endpoint **eps;
2340 struct usb_interface *intf;
2341 int r;
2342
2343 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2344 if (r)
2345 return r;
2346
2347 destroy_async_on_interface(ps,
2348 intf->altsetting[0].desc.bInterfaceNumber);
2349
2350 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2351 kfree(eps);
2352 return r;
2353 }
2354
2355 static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2356 {
2357 u32 data;
2358
2359 if (copy_from_user(&data, arg, sizeof(data)))
2360 return -EFAULT;
2361
2362 /* This is a one way operation. Once privileges are
2363 * dropped, you cannot regain them. You may however reissue
2364 * this ioctl to shrink the allowed interfaces mask.
2365 */
2366 ps->interface_allowed_mask &= data;
2367 ps->privileges_dropped = true;
2368
2369 return 0;
2370 }
2371
2372 /*
2373 * NOTE: All requests here that have interface numbers as parameters
2374 * are assuming that somehow the configuration has been prevented from
2375 * changing. But there's no mechanism to ensure that...
2376 */
2377 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2378 void __user *p)
2379 {
2380 struct usb_dev_state *ps = file->private_data;
2381 struct inode *inode = file_inode(file);
2382 struct usb_device *dev = ps->dev;
2383 int ret = -ENOTTY;
2384
2385 if (!(file->f_mode & FMODE_WRITE))
2386 return -EPERM;
2387
2388 usb_lock_device(dev);
2389
2390 /* Reap operations are allowed even after disconnection */
2391 switch (cmd) {
2392 case USBDEVFS_REAPURB:
2393 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2394 ret = proc_reapurb(ps, p);
2395 goto done;
2396
2397 case USBDEVFS_REAPURBNDELAY:
2398 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2399 ret = proc_reapurbnonblock(ps, p);
2400 goto done;
2401
2402 #ifdef CONFIG_COMPAT
2403 case USBDEVFS_REAPURB32:
2404 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2405 ret = proc_reapurb_compat(ps, p);
2406 goto done;
2407
2408 case USBDEVFS_REAPURBNDELAY32:
2409 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2410 ret = proc_reapurbnonblock_compat(ps, p);
2411 goto done;
2412 #endif
2413 }
2414
2415 if (!connected(ps)) {
2416 usb_unlock_device(dev);
2417 return -ENODEV;
2418 }
2419
2420 switch (cmd) {
2421 case USBDEVFS_CONTROL:
2422 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2423 ret = proc_control(ps, p);
2424 if (ret >= 0)
2425 inode->i_mtime = current_time(inode);
2426 break;
2427
2428 case USBDEVFS_BULK:
2429 snoop(&dev->dev, "%s: BULK\n", __func__);
2430 ret = proc_bulk(ps, p);
2431 if (ret >= 0)
2432 inode->i_mtime = current_time(inode);
2433 break;
2434
2435 case USBDEVFS_RESETEP:
2436 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2437 ret = proc_resetep(ps, p);
2438 if (ret >= 0)
2439 inode->i_mtime = current_time(inode);
2440 break;
2441
2442 case USBDEVFS_RESET:
2443 snoop(&dev->dev, "%s: RESET\n", __func__);
2444 ret = proc_resetdevice(ps);
2445 break;
2446
2447 case USBDEVFS_CLEAR_HALT:
2448 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2449 ret = proc_clearhalt(ps, p);
2450 if (ret >= 0)
2451 inode->i_mtime = current_time(inode);
2452 break;
2453
2454 case USBDEVFS_GETDRIVER:
2455 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2456 ret = proc_getdriver(ps, p);
2457 break;
2458
2459 case USBDEVFS_CONNECTINFO:
2460 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2461 ret = proc_connectinfo(ps, p);
2462 break;
2463
2464 case USBDEVFS_SETINTERFACE:
2465 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2466 ret = proc_setintf(ps, p);
2467 break;
2468
2469 case USBDEVFS_SETCONFIGURATION:
2470 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2471 ret = proc_setconfig(ps, p);
2472 break;
2473
2474 case USBDEVFS_SUBMITURB:
2475 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2476 ret = proc_submiturb(ps, p);
2477 if (ret >= 0)
2478 inode->i_mtime = current_time(inode);
2479 break;
2480
2481 #ifdef CONFIG_COMPAT
2482 case USBDEVFS_CONTROL32:
2483 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2484 ret = proc_control_compat(ps, p);
2485 if (ret >= 0)
2486 inode->i_mtime = current_time(inode);
2487 break;
2488
2489 case USBDEVFS_BULK32:
2490 snoop(&dev->dev, "%s: BULK32\n", __func__);
2491 ret = proc_bulk_compat(ps, p);
2492 if (ret >= 0)
2493 inode->i_mtime = current_time(inode);
2494 break;
2495
2496 case USBDEVFS_DISCSIGNAL32:
2497 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2498 ret = proc_disconnectsignal_compat(ps, p);
2499 break;
2500
2501 case USBDEVFS_SUBMITURB32:
2502 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2503 ret = proc_submiturb_compat(ps, p);
2504 if (ret >= 0)
2505 inode->i_mtime = current_time(inode);
2506 break;
2507
2508 case USBDEVFS_IOCTL32:
2509 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2510 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2511 break;
2512 #endif
2513
2514 case USBDEVFS_DISCARDURB:
2515 snoop(&dev->dev, "%s: DISCARDURB %pK\n", __func__, p);
2516 ret = proc_unlinkurb(ps, p);
2517 break;
2518
2519 case USBDEVFS_DISCSIGNAL:
2520 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2521 ret = proc_disconnectsignal(ps, p);
2522 break;
2523
2524 case USBDEVFS_CLAIMINTERFACE:
2525 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2526 ret = proc_claiminterface(ps, p);
2527 break;
2528
2529 case USBDEVFS_RELEASEINTERFACE:
2530 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2531 ret = proc_releaseinterface(ps, p);
2532 break;
2533
2534 case USBDEVFS_IOCTL:
2535 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2536 ret = proc_ioctl_default(ps, p);
2537 break;
2538
2539 case USBDEVFS_CLAIM_PORT:
2540 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2541 ret = proc_claim_port(ps, p);
2542 break;
2543
2544 case USBDEVFS_RELEASE_PORT:
2545 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2546 ret = proc_release_port(ps, p);
2547 break;
2548 case USBDEVFS_GET_CAPABILITIES:
2549 ret = proc_get_capabilities(ps, p);
2550 break;
2551 case USBDEVFS_DISCONNECT_CLAIM:
2552 ret = proc_disconnect_claim(ps, p);
2553 break;
2554 case USBDEVFS_ALLOC_STREAMS:
2555 ret = proc_alloc_streams(ps, p);
2556 break;
2557 case USBDEVFS_FREE_STREAMS:
2558 ret = proc_free_streams(ps, p);
2559 break;
2560 case USBDEVFS_DROP_PRIVILEGES:
2561 ret = proc_drop_privileges(ps, p);
2562 break;
2563 case USBDEVFS_GET_SPEED:
2564 ret = ps->dev->speed;
2565 break;
2566 }
2567
2568 done:
2569 usb_unlock_device(dev);
2570 if (ret >= 0)
2571 inode->i_atime = current_time(inode);
2572 return ret;
2573 }
2574
2575 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2576 unsigned long arg)
2577 {
2578 int ret;
2579
2580 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2581
2582 return ret;
2583 }
2584
2585 #ifdef CONFIG_COMPAT
2586 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2587 unsigned long arg)
2588 {
2589 int ret;
2590
2591 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2592
2593 return ret;
2594 }
2595 #endif
2596
2597 /* No kernel lock - fine */
2598 static __poll_t usbdev_poll(struct file *file,
2599 struct poll_table_struct *wait)
2600 {
2601 struct usb_dev_state *ps = file->private_data;
2602 __poll_t mask = 0;
2603
2604 poll_wait(file, &ps->wait, wait);
2605 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2606 mask |= EPOLLOUT | EPOLLWRNORM;
2607 if (!connected(ps))
2608 mask |= EPOLLHUP;
2609 if (list_empty(&ps->list))
2610 mask |= EPOLLERR;
2611 return mask;
2612 }
2613
2614 const struct file_operations usbdev_file_operations = {
2615 .owner = THIS_MODULE,
2616 .llseek = no_seek_end_llseek,
2617 .read = usbdev_read,
2618 .poll = usbdev_poll,
2619 .unlocked_ioctl = usbdev_ioctl,
2620 #ifdef CONFIG_COMPAT
2621 .compat_ioctl = usbdev_compat_ioctl,
2622 #endif
2623 .mmap = usbdev_mmap,
2624 .open = usbdev_open,
2625 .release = usbdev_release,
2626 };
2627
2628 static void usbdev_remove(struct usb_device *udev)
2629 {
2630 struct usb_dev_state *ps;
2631 struct siginfo sinfo;
2632
2633 while (!list_empty(&udev->filelist)) {
2634 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2635 destroy_all_async(ps);
2636 wake_up_all(&ps->wait);
2637 list_del_init(&ps->list);
2638 if (ps->discsignr) {
2639 clear_siginfo(&sinfo);
2640 sinfo.si_signo = ps->discsignr;
2641 sinfo.si_errno = EPIPE;
2642 sinfo.si_code = SI_ASYNCIO;
2643 sinfo.si_addr = ps->disccontext;
2644 kill_pid_info_as_cred(ps->discsignr, &sinfo,
2645 ps->disc_pid, ps->cred);
2646 }
2647 }
2648 }
2649
2650 static int usbdev_notify(struct notifier_block *self,
2651 unsigned long action, void *dev)
2652 {
2653 switch (action) {
2654 case USB_DEVICE_ADD:
2655 break;
2656 case USB_DEVICE_REMOVE:
2657 usbdev_remove(dev);
2658 break;
2659 }
2660 return NOTIFY_OK;
2661 }
2662
2663 static struct notifier_block usbdev_nb = {
2664 .notifier_call = usbdev_notify,
2665 };
2666
2667 static struct cdev usb_device_cdev;
2668
2669 int __init usb_devio_init(void)
2670 {
2671 int retval;
2672
2673 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2674 "usb_device");
2675 if (retval) {
2676 printk(KERN_ERR "Unable to register minors for usb_device\n");
2677 goto out;
2678 }
2679 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2680 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2681 if (retval) {
2682 printk(KERN_ERR "Unable to get usb_device major %d\n",
2683 USB_DEVICE_MAJOR);
2684 goto error_cdev;
2685 }
2686 usb_register_notify(&usbdev_nb);
2687 out:
2688 return retval;
2689
2690 error_cdev:
2691 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2692 goto out;
2693 }
2694
2695 void usb_devio_cleanup(void)
2696 {
2697 usb_unregister_notify(&usbdev_nb);
2698 cdev_del(&usb_device_cdev);
2699 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2700 }
Linux with added FPC-III support