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initial commit with v2.6.32.60
[linux-2.6.32.60-moxart.git] / drivers / usb / core / devio.c
blob48742ffed90e21c4c20aee9fcd8defc98c7ad954
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/smp_lock.h>
41 #include <linux/signal.h>
42 #include <linux/poll.h>
43 #include <linux/module.h>
44 #include <linux/usb.h>
45 #include <linux/usbdevice_fs.h>
46 #include <linux/cdev.h>
47 #include <linux/notifier.h>
48 #include <linux/security.h>
49 #include <asm/uaccess.h>
50 #include <asm/byteorder.h>
51 #include <linux/moduleparam.h>
52
53 #include "hcd.h" /* for usbcore internals */
54 #include "usb.h"
55 #include "hub.h"
56
57 #define USB_MAXBUS 64
58 #define USB_DEVICE_MAX USB_MAXBUS * 128
59
60 /* Mutual exclusion for removal, open, and release */
61 DEFINE_MUTEX(usbfs_mutex);
62
63 struct dev_state {
64 struct list_head list; /* state list */
65 struct usb_device *dev;
66 struct file *file;
67 spinlock_t lock; /* protects the async urb lists */
68 struct list_head async_pending;
69 struct list_head async_completed;
70 wait_queue_head_t wait; /* wake up if a request completed */
71 unsigned int discsignr;
72 struct pid *disc_pid;
73 uid_t disc_uid, disc_euid;
74 void __user *disccontext;
75 unsigned long ifclaimed;
76 u32 secid;
77 u32 disabled_bulk_eps;
78 };
79
80 struct async {
81 struct list_head asynclist;
82 struct dev_state *ps;
83 struct pid *pid;
84 uid_t uid, euid;
85 unsigned int signr;
86 unsigned int ifnum;
87 void __user *userbuffer;
88 void __user *userurb;
89 struct urb *urb;
90 int status;
91 u32 secid;
92 u8 bulk_addr;
93 u8 bulk_status;
94 };
95
96 static int usbfs_snoop;
97 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
98 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
99
100 #define snoop(dev, format, arg...) \
101 do { \
102 if (usbfs_snoop) \
103 dev_info(dev , format , ## arg); \
104 } while (0)
105
106 enum snoop_when {
107 SUBMIT, COMPLETE
108 };
109
110 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
111
112 #define MAX_USBFS_BUFFER_SIZE 16384
113
114
115 static int connected(struct dev_state *ps)
116 {
117 return (!list_empty(&ps->list) &&
118 ps->dev->state != USB_STATE_NOTATTACHED);
119 }
120
121 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
122 {
123 loff_t ret;
124
125 lock_kernel();
126
127 switch (orig) {
128 case 0:
129 file->f_pos = offset;
130 ret = file->f_pos;
131 break;
132 case 1:
133 file->f_pos += offset;
134 ret = file->f_pos;
135 break;
136 case 2:
137 default:
138 ret = -EINVAL;
139 }
140
141 unlock_kernel();
142 return ret;
143 }
144
145 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
146 loff_t *ppos)
147 {
148 struct dev_state *ps = file->private_data;
149 struct usb_device *dev = ps->dev;
150 ssize_t ret = 0;
151 unsigned len;
152 loff_t pos;
153 int i;
154
155 pos = *ppos;
156 usb_lock_device(dev);
157 if (!connected(ps)) {
158 ret = -ENODEV;
159 goto err;
160 } else if (pos < 0) {
161 ret = -EINVAL;
162 goto err;
163 }
164
165 if (pos < sizeof(struct usb_device_descriptor)) {
166 /* 18 bytes - fits on the stack */
167 struct usb_device_descriptor temp_desc;
168
169 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
170 le16_to_cpus(&temp_desc.bcdUSB);
171 le16_to_cpus(&temp_desc.idVendor);
172 le16_to_cpus(&temp_desc.idProduct);
173 le16_to_cpus(&temp_desc.bcdDevice);
174
175 len = sizeof(struct usb_device_descriptor) - pos;
176 if (len > nbytes)
177 len = nbytes;
178 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
179 ret = -EFAULT;
180 goto err;
181 }
182
183 *ppos += len;
184 buf += len;
185 nbytes -= len;
186 ret += len;
187 }
188
189 pos = sizeof(struct usb_device_descriptor);
190 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
191 struct usb_config_descriptor *config =
192 (struct usb_config_descriptor *)dev->rawdescriptors[i];
193 unsigned int length = le16_to_cpu(config->wTotalLength);
194
195 if (*ppos < pos + length) {
196
197 /* The descriptor may claim to be longer than it
198 * really is. Here is the actual allocated length. */
199 unsigned alloclen =
200 le16_to_cpu(dev->config[i].desc.wTotalLength);
201
202 len = length - (*ppos - pos);
203 if (len > nbytes)
204 len = nbytes;
205
206 /* Simply don't write (skip over) unallocated parts */
207 if (alloclen > (*ppos - pos)) {
208 alloclen -= (*ppos - pos);
209 if (copy_to_user(buf,
210 dev->rawdescriptors[i] + (*ppos - pos),
211 min(len, alloclen))) {
212 ret = -EFAULT;
213 goto err;
214 }
215 }
216
217 *ppos += len;
218 buf += len;
219 nbytes -= len;
220 ret += len;
221 }
222
223 pos += length;
224 }
225
226 err:
227 usb_unlock_device(dev);
228 return ret;
229 }
230
231 /*
232 * async list handling
233 */
234
235 static struct async *alloc_async(unsigned int numisoframes)
236 {
237 struct async *as;
238
239 as = kzalloc(sizeof(struct async), GFP_KERNEL);
240 if (!as)
241 return NULL;
242 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
243 if (!as->urb) {
244 kfree(as);
245 return NULL;
246 }
247 return as;
248 }
249
250 static void free_async(struct async *as)
251 {
252 put_pid(as->pid);
253 kfree(as->urb->transfer_buffer);
254 kfree(as->urb->setup_packet);
255 usb_free_urb(as->urb);
256 kfree(as);
257 }
258
259 static void async_newpending(struct async *as)
260 {
261 struct dev_state *ps = as->ps;
262 unsigned long flags;
263
264 spin_lock_irqsave(&ps->lock, flags);
265 list_add_tail(&as->asynclist, &ps->async_pending);
266 spin_unlock_irqrestore(&ps->lock, flags);
267 }
268
269 static void async_removepending(struct async *as)
270 {
271 struct dev_state *ps = as->ps;
272 unsigned long flags;
273
274 spin_lock_irqsave(&ps->lock, flags);
275 list_del_init(&as->asynclist);
276 spin_unlock_irqrestore(&ps->lock, flags);
277 }
278
279 static struct async *async_getcompleted(struct dev_state *ps)
280 {
281 unsigned long flags;
282 struct async *as = NULL;
283
284 spin_lock_irqsave(&ps->lock, flags);
285 if (!list_empty(&ps->async_completed)) {
286 as = list_entry(ps->async_completed.next, struct async,
287 asynclist);
288 list_del_init(&as->asynclist);
289 }
290 spin_unlock_irqrestore(&ps->lock, flags);
291 return as;
292 }
293
294 static struct async *async_getpending(struct dev_state *ps,
295 void __user *userurb)
296 {
297 unsigned long flags;
298 struct async *as;
299
300 spin_lock_irqsave(&ps->lock, flags);
301 list_for_each_entry(as, &ps->async_pending, asynclist)
302 if (as->userurb == userurb) {
303 list_del_init(&as->asynclist);
304 spin_unlock_irqrestore(&ps->lock, flags);
305 return as;
306 }
307 spin_unlock_irqrestore(&ps->lock, flags);
308 return NULL;
309 }
310
311 static void snoop_urb(struct usb_device *udev,
312 void __user *userurb, int pipe, unsigned length,
313 int timeout_or_status, enum snoop_when when)
314 {
315 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
316 static const char *dirs[] = {"out", "in"};
317 int ep;
318 const char *t, *d;
319
320 if (!usbfs_snoop)
321 return;
322
323 ep = usb_pipeendpoint(pipe);
324 t = types[usb_pipetype(pipe)];
325 d = dirs[!!usb_pipein(pipe)];
326
327 if (userurb) { /* Async */
328 if (when == SUBMIT)
329 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
330 "length %u\n",
331 userurb, ep, t, d, length);
332 else
333 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
334 "actual_length %u status %d\n",
335 userurb, ep, t, d, length,
336 timeout_or_status);
337 } else {
338 if (when == SUBMIT)
339 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
340 "timeout %d\n",
341 ep, t, d, length, timeout_or_status);
342 else
343 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
344 "status %d\n",
345 ep, t, d, length, timeout_or_status);
346 }
347 }
348
349 #define AS_CONTINUATION 1
350 #define AS_UNLINK 2
351
352 static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr)
353 __releases(ps->lock)
354 __acquires(ps->lock)
355 {
356 struct async *as;
357
358 /* Mark all the pending URBs that match bulk_addr, up to but not
359 * including the first one without AS_CONTINUATION. If such an
360 * URB is encountered then a new transfer has already started so
361 * the endpoint doesn't need to be disabled; otherwise it does.
362 */
363 list_for_each_entry(as, &ps->async_pending, asynclist) {
364 if (as->bulk_addr == bulk_addr) {
365 if (as->bulk_status != AS_CONTINUATION)
366 goto rescan;
367 as->bulk_status = AS_UNLINK;
368 as->bulk_addr = 0;
369 }
370 }
371 ps->disabled_bulk_eps |= (1 << bulk_addr);
372
373 /* Now carefully unlink all the marked pending URBs */
374 rescan:
375 list_for_each_entry(as, &ps->async_pending, asynclist) {
376 if (as->bulk_status == AS_UNLINK) {
377 as->bulk_status = 0; /* Only once */
378 spin_unlock(&ps->lock); /* Allow completions */
379 usb_unlink_urb(as->urb);
380 spin_lock(&ps->lock);
381 goto rescan;
382 }
383 }
384 }
385
386 static void async_completed(struct urb *urb)
387 {
388 struct async *as = urb->context;
389 struct dev_state *ps = as->ps;
390 struct siginfo sinfo;
391 struct pid *pid = NULL;
392 uid_t uid = 0;
393 uid_t euid = 0;
394 u32 secid = 0;
395 int signr;
396
397 spin_lock(&ps->lock);
398 list_move_tail(&as->asynclist, &ps->async_completed);
399 as->status = urb->status;
400 signr = as->signr;
401 if (signr) {
402 sinfo.si_signo = as->signr;
403 sinfo.si_errno = as->status;
404 sinfo.si_code = SI_ASYNCIO;
405 sinfo.si_addr = as->userurb;
406 pid = get_pid(as->pid);
407 uid = as->uid;
408 euid = as->euid;
409 secid = as->secid;
410 }
411 snoop(&urb->dev->dev, "urb complete\n");
412 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
413 as->status, COMPLETE);
414 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
415 as->status != -ENOENT)
416 cancel_bulk_urbs(ps, as->bulk_addr);
417 spin_unlock(&ps->lock);
418
419 if (signr) {
420 kill_pid_info_as_uid(sinfo.si_signo, &sinfo, pid, uid,
421 euid, secid);
422 put_pid(pid);
423 }
424
425 wake_up(&ps->wait);
426 }
427
428 static void destroy_async(struct dev_state *ps, struct list_head *list)
429 {
430 struct async *as;
431 unsigned long flags;
432
433 spin_lock_irqsave(&ps->lock, flags);
434 while (!list_empty(list)) {
435 as = list_entry(list->next, struct async, asynclist);
436 list_del_init(&as->asynclist);
437
438 /* drop the spinlock so the completion handler can run */
439 spin_unlock_irqrestore(&ps->lock, flags);
440 usb_kill_urb(as->urb);
441 spin_lock_irqsave(&ps->lock, flags);
442 }
443 spin_unlock_irqrestore(&ps->lock, flags);
444 }
445
446 static void destroy_async_on_interface(struct dev_state *ps,
447 unsigned int ifnum)
448 {
449 struct list_head *p, *q, hitlist;
450 unsigned long flags;
451
452 INIT_LIST_HEAD(&hitlist);
453 spin_lock_irqsave(&ps->lock, flags);
454 list_for_each_safe(p, q, &ps->async_pending)
455 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
456 list_move_tail(p, &hitlist);
457 spin_unlock_irqrestore(&ps->lock, flags);
458 destroy_async(ps, &hitlist);
459 }
460
461 static void destroy_all_async(struct dev_state *ps)
462 {
463 destroy_async(ps, &ps->async_pending);
464 }
465
466 /*
467 * interface claims are made only at the request of user level code,
468 * which can also release them (explicitly or by closing files).
469 * they're also undone when devices disconnect.
470 */
471
472 static int driver_probe(struct usb_interface *intf,
473 const struct usb_device_id *id)
474 {
475 return -ENODEV;
476 }
477
478 static void driver_disconnect(struct usb_interface *intf)
479 {
480 struct dev_state *ps = usb_get_intfdata(intf);
481 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
482
483 if (!ps)
484 return;
485
486 /* NOTE: this relies on usbcore having canceled and completed
487 * all pending I/O requests; 2.6 does that.
488 */
489
490 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
491 clear_bit(ifnum, &ps->ifclaimed);
492 else
493 dev_warn(&intf->dev, "interface number %u out of range\n",
494 ifnum);
495
496 usb_set_intfdata(intf, NULL);
497
498 /* force async requests to complete */
499 destroy_async_on_interface(ps, ifnum);
500 }
501
502 /* The following routines are merely placeholders. There is no way
503 * to inform a user task about suspend or resumes.
504 */
505 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
506 {
507 return 0;
508 }
509
510 static int driver_resume(struct usb_interface *intf)
511 {
512 return 0;
513 }
514
515 struct usb_driver usbfs_driver = {
516 .name = "usbfs",
517 .probe = driver_probe,
518 .disconnect = driver_disconnect,
519 .suspend = driver_suspend,
520 .resume = driver_resume,
521 };
522
523 static int claimintf(struct dev_state *ps, unsigned int ifnum)
524 {
525 struct usb_device *dev = ps->dev;
526 struct usb_interface *intf;
527 int err;
528
529 if (ifnum >= 8*sizeof(ps->ifclaimed))
530 return -EINVAL;
531 /* already claimed */
532 if (test_bit(ifnum, &ps->ifclaimed))
533 return 0;
534
535 intf = usb_ifnum_to_if(dev, ifnum);
536 if (!intf)
537 err = -ENOENT;
538 else
539 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
540 if (err == 0)
541 set_bit(ifnum, &ps->ifclaimed);
542 return err;
543 }
544
545 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
546 {
547 struct usb_device *dev;
548 struct usb_interface *intf;
549 int err;
550
551 err = -EINVAL;
552 if (ifnum >= 8*sizeof(ps->ifclaimed))
553 return err;
554 dev = ps->dev;
555 intf = usb_ifnum_to_if(dev, ifnum);
556 if (!intf)
557 err = -ENOENT;
558 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
559 usb_driver_release_interface(&usbfs_driver, intf);
560 err = 0;
561 }
562 return err;
563 }
564
565 static int checkintf(struct dev_state *ps, unsigned int ifnum)
566 {
567 if (ps->dev->state != USB_STATE_CONFIGURED)
568 return -EHOSTUNREACH;
569 if (ifnum >= 8*sizeof(ps->ifclaimed))
570 return -EINVAL;
571 if (test_bit(ifnum, &ps->ifclaimed))
572 return 0;
573 /* if not yet claimed, claim it for the driver */
574 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
575 "interface %u before use\n", task_pid_nr(current),
576 current->comm, ifnum);
577 return claimintf(ps, ifnum);
578 }
579
580 static int findintfep(struct usb_device *dev, unsigned int ep)
581 {
582 unsigned int i, j, e;
583 struct usb_interface *intf;
584 struct usb_host_interface *alts;
585 struct usb_endpoint_descriptor *endpt;
586
587 if (ep & ~(USB_DIR_IN|0xf))
588 return -EINVAL;
589 if (!dev->actconfig)
590 return -ESRCH;
591 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
592 intf = dev->actconfig->interface[i];
593 for (j = 0; j < intf->num_altsetting; j++) {
594 alts = &intf->altsetting[j];
595 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
596 endpt = &alts->endpoint[e].desc;
597 if (endpt->bEndpointAddress == ep)
598 return alts->desc.bInterfaceNumber;
599 }
600 }
601 }
602 return -ENOENT;
603 }
604
605 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
606 unsigned int index)
607 {
608 int ret = 0;
609
610 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
611 && ps->dev->state != USB_STATE_ADDRESS
612 && ps->dev->state != USB_STATE_CONFIGURED)
613 return -EHOSTUNREACH;
614 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
615 return 0;
616
617 index &= 0xff;
618 switch (requesttype & USB_RECIP_MASK) {
619 case USB_RECIP_ENDPOINT:
620 ret = findintfep(ps->dev, index);
621 if (ret >= 0)
622 ret = checkintf(ps, ret);
623 break;
624
625 case USB_RECIP_INTERFACE:
626 ret = checkintf(ps, index);
627 break;
628 }
629 return ret;
630 }
631
632 static int match_devt(struct device *dev, void *data)
633 {
634 return dev->devt == (dev_t) (unsigned long) data;
635 }
636
637 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
638 {
639 struct device *dev;
640
641 dev = bus_find_device(&usb_bus_type, NULL,
642 (void *) (unsigned long) devt, match_devt);
643 if (!dev)
644 return NULL;
645 return container_of(dev, struct usb_device, dev);
646 }
647
648 /*
649 * file operations
650 */
651 static int usbdev_open(struct inode *inode, struct file *file)
652 {
653 struct usb_device *dev = NULL;
654 struct dev_state *ps;
655 const struct cred *cred = current_cred();
656 int ret;
657
658 lock_kernel();
659 /* Protect against simultaneous removal or release */
660 mutex_lock(&usbfs_mutex);
661
662 ret = -ENOMEM;
663 ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
664 if (!ps)
665 goto out;
666
667 ret = -ENODEV;
668
669 /* usbdev device-node */
670 if (imajor(inode) == USB_DEVICE_MAJOR)
671 dev = usbdev_lookup_by_devt(inode->i_rdev);
672 #ifdef CONFIG_USB_DEVICEFS
673 /* procfs file */
674 if (!dev) {
675 dev = inode->i_private;
676 if (dev && dev->usbfs_dentry &&
677 dev->usbfs_dentry->d_inode == inode)
678 usb_get_dev(dev);
679 else
680 dev = NULL;
681 }
682 #endif
683 if (!dev || dev->state == USB_STATE_NOTATTACHED)
684 goto out;
685 ret = usb_autoresume_device(dev);
686 if (ret)
687 goto out;
688
689 ret = 0;
690 ps->dev = dev;
691 ps->file = file;
692 spin_lock_init(&ps->lock);
693 INIT_LIST_HEAD(&ps->list);
694 INIT_LIST_HEAD(&ps->async_pending);
695 INIT_LIST_HEAD(&ps->async_completed);
696 init_waitqueue_head(&ps->wait);
697 ps->discsignr = 0;
698 ps->disc_pid = get_pid(task_pid(current));
699 ps->disc_uid = cred->uid;
700 ps->disc_euid = cred->euid;
701 ps->disccontext = NULL;
702 ps->ifclaimed = 0;
703 security_task_getsecid(current, &ps->secid);
704 smp_wmb();
705 list_add_tail(&ps->list, &dev->filelist);
706 file->private_data = ps;
707 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
708 current->comm);
709 out:
710 if (ret) {
711 kfree(ps);
712 usb_put_dev(dev);
713 }
714 mutex_unlock(&usbfs_mutex);
715 unlock_kernel();
716 return ret;
717 }
718
719 static int usbdev_release(struct inode *inode, struct file *file)
720 {
721 struct dev_state *ps = file->private_data;
722 struct usb_device *dev = ps->dev;
723 unsigned int ifnum;
724 struct async *as;
725
726 usb_lock_device(dev);
727 usb_hub_release_all_ports(dev, ps);
728
729 /* Protect against simultaneous open */
730 mutex_lock(&usbfs_mutex);
731 list_del_init(&ps->list);
732 mutex_unlock(&usbfs_mutex);
733
734 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
735 ifnum++) {
736 if (test_bit(ifnum, &ps->ifclaimed))
737 releaseintf(ps, ifnum);
738 }
739 destroy_all_async(ps);
740 usb_autosuspend_device(dev);
741 usb_unlock_device(dev);
742 usb_put_dev(dev);
743 put_pid(ps->disc_pid);
744
745 as = async_getcompleted(ps);
746 while (as) {
747 free_async(as);
748 as = async_getcompleted(ps);
749 }
750 kfree(ps);
751 return 0;
752 }
753
754 static int proc_control(struct dev_state *ps, void __user *arg)
755 {
756 struct usb_device *dev = ps->dev;
757 struct usbdevfs_ctrltransfer ctrl;
758 unsigned int tmo;
759 unsigned char *tbuf;
760 unsigned wLength;
761 int i, pipe, ret;
762
763 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
764 return -EFAULT;
765 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
766 if (ret)
767 return ret;
768 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
769 if (wLength > PAGE_SIZE)
770 return -EINVAL;
771 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
772 if (!tbuf)
773 return -ENOMEM;
774 tmo = ctrl.timeout;
775 if (ctrl.bRequestType & 0x80) {
776 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
777 ctrl.wLength)) {
778 free_page((unsigned long)tbuf);
779 return -EINVAL;
780 }
781 pipe = usb_rcvctrlpipe(dev, 0);
782 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT);
783
784 usb_unlock_device(dev);
785 i = usb_control_msg(dev, pipe, ctrl.bRequest,
786 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
787 tbuf, ctrl.wLength, tmo);
788 usb_lock_device(dev);
789 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE);
790
791 if ((i > 0) && ctrl.wLength) {
792 if (copy_to_user(ctrl.data, tbuf, i)) {
793 free_page((unsigned long)tbuf);
794 return -EFAULT;
795 }
796 }
797 } else {
798 if (ctrl.wLength) {
799 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
800 free_page((unsigned long)tbuf);
801 return -EFAULT;
802 }
803 }
804 pipe = usb_sndctrlpipe(dev, 0);
805 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT);
806
807 usb_unlock_device(dev);
808 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
809 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
810 tbuf, ctrl.wLength, tmo);
811 usb_lock_device(dev);
812 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE);
813 }
814 free_page((unsigned long)tbuf);
815 if (i < 0 && i != -EPIPE) {
816 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
817 "failed cmd %s rqt %u rq %u len %u ret %d\n",
818 current->comm, ctrl.bRequestType, ctrl.bRequest,
819 ctrl.wLength, i);
820 }
821 return i;
822 }
823
824 static int proc_bulk(struct dev_state *ps, void __user *arg)
825 {
826 struct usb_device *dev = ps->dev;
827 struct usbdevfs_bulktransfer bulk;
828 unsigned int tmo, len1, pipe;
829 int len2;
830 unsigned char *tbuf;
831 int i, ret;
832
833 if (copy_from_user(&bulk, arg, sizeof(bulk)))
834 return -EFAULT;
835 ret = findintfep(ps->dev, bulk.ep);
836 if (ret < 0)
837 return ret;
838 ret = checkintf(ps, ret);
839 if (ret)
840 return ret;
841 if (bulk.ep & USB_DIR_IN)
842 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
843 else
844 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
845 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
846 return -EINVAL;
847 len1 = bulk.len;
848 if (len1 > MAX_USBFS_BUFFER_SIZE)
849 return -EINVAL;
850 if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
851 return -ENOMEM;
852 tmo = bulk.timeout;
853 if (bulk.ep & 0x80) {
854 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
855 kfree(tbuf);
856 return -EINVAL;
857 }
858 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT);
859
860 usb_unlock_device(dev);
861 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
862 usb_lock_device(dev);
863 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE);
864
865 if (!i && len2) {
866 if (copy_to_user(bulk.data, tbuf, len2)) {
867 kfree(tbuf);
868 return -EFAULT;
869 }
870 }
871 } else {
872 if (len1) {
873 if (copy_from_user(tbuf, bulk.data, len1)) {
874 kfree(tbuf);
875 return -EFAULT;
876 }
877 }
878 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT);
879
880 usb_unlock_device(dev);
881 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
882 usb_lock_device(dev);
883 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE);
884 }
885 kfree(tbuf);
886 if (i < 0)
887 return i;
888 return len2;
889 }
890
891 static int proc_resetep(struct dev_state *ps, void __user *arg)
892 {
893 unsigned int ep;
894 int ret;
895
896 if (get_user(ep, (unsigned int __user *)arg))
897 return -EFAULT;
898 ret = findintfep(ps->dev, ep);
899 if (ret < 0)
900 return ret;
901 ret = checkintf(ps, ret);
902 if (ret)
903 return ret;
904 usb_reset_endpoint(ps->dev, ep);
905 return 0;
906 }
907
908 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
909 {
910 unsigned int ep;
911 int pipe;
912 int ret;
913
914 if (get_user(ep, (unsigned int __user *)arg))
915 return -EFAULT;
916 ret = findintfep(ps->dev, ep);
917 if (ret < 0)
918 return ret;
919 ret = checkintf(ps, ret);
920 if (ret)
921 return ret;
922 if (ep & USB_DIR_IN)
923 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
924 else
925 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
926
927 return usb_clear_halt(ps->dev, pipe);
928 }
929
930 static int proc_getdriver(struct dev_state *ps, void __user *arg)
931 {
932 struct usbdevfs_getdriver gd;
933 struct usb_interface *intf;
934 int ret;
935
936 if (copy_from_user(&gd, arg, sizeof(gd)))
937 return -EFAULT;
938 intf = usb_ifnum_to_if(ps->dev, gd.interface);
939 if (!intf || !intf->dev.driver)
940 ret = -ENODATA;
941 else {
942 strncpy(gd.driver, intf->dev.driver->name,
943 sizeof(gd.driver));
944 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
945 }
946 return ret;
947 }
948
949 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
950 {
951 struct usbdevfs_connectinfo ci = {
952 .devnum = ps->dev->devnum,
953 .slow = ps->dev->speed == USB_SPEED_LOW
954 };
955
956 if (copy_to_user(arg, &ci, sizeof(ci)))
957 return -EFAULT;
958 return 0;
959 }
960
961 static int proc_resetdevice(struct dev_state *ps)
962 {
963 return usb_reset_device(ps->dev);
964 }
965
966 static int proc_setintf(struct dev_state *ps, void __user *arg)
967 {
968 struct usbdevfs_setinterface setintf;
969 int ret;
970
971 if (copy_from_user(&setintf, arg, sizeof(setintf)))
972 return -EFAULT;
973 if ((ret = checkintf(ps, setintf.interface)))
974 return ret;
975 return usb_set_interface(ps->dev, setintf.interface,
976 setintf.altsetting);
977 }
978
979 static int proc_setconfig(struct dev_state *ps, void __user *arg)
980 {
981 int u;
982 int status = 0;
983 struct usb_host_config *actconfig;
984
985 if (get_user(u, (int __user *)arg))
986 return -EFAULT;
987
988 actconfig = ps->dev->actconfig;
989
990 /* Don't touch the device if any interfaces are claimed.
991 * It could interfere with other drivers' operations, and if
992 * an interface is claimed by usbfs it could easily deadlock.
993 */
994 if (actconfig) {
995 int i;
996
997 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
998 if (usb_interface_claimed(actconfig->interface[i])) {
999 dev_warn(&ps->dev->dev,
1000 "usbfs: interface %d claimed by %s "
1001 "while '%s' sets config #%d\n",
1002 actconfig->interface[i]
1003 ->cur_altsetting
1004 ->desc.bInterfaceNumber,
1005 actconfig->interface[i]
1006 ->dev.driver->name,
1007 current->comm, u);
1008 status = -EBUSY;
1009 break;
1010 }
1011 }
1012 }
1013
1014 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1015 * so avoid usb_set_configuration()'s kick to sysfs
1016 */
1017 if (status == 0) {
1018 if (actconfig && actconfig->desc.bConfigurationValue == u)
1019 status = usb_reset_configuration(ps->dev);
1020 else
1021 status = usb_set_configuration(ps->dev, u);
1022 }
1023
1024 return status;
1025 }
1026
1027 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1028 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1029 void __user *arg)
1030 {
1031 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1032 struct usb_host_endpoint *ep;
1033 struct async *as;
1034 struct usb_ctrlrequest *dr = NULL;
1035 const struct cred *cred = current_cred();
1036 unsigned int u, totlen, isofrmlen;
1037 int ret, ifnum = -1;
1038 int is_in;
1039
1040 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1041 USBDEVFS_URB_SHORT_NOT_OK |
1042 USBDEVFS_URB_BULK_CONTINUATION |
1043 USBDEVFS_URB_NO_FSBR |
1044 USBDEVFS_URB_ZERO_PACKET |
1045 USBDEVFS_URB_NO_INTERRUPT))
1046 return -EINVAL;
1047 if (uurb->buffer_length > 0 && !uurb->buffer)
1048 return -EINVAL;
1049 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1050 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1051 ifnum = findintfep(ps->dev, uurb->endpoint);
1052 if (ifnum < 0)
1053 return ifnum;
1054 ret = checkintf(ps, ifnum);
1055 if (ret)
1056 return ret;
1057 }
1058 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1059 is_in = 1;
1060 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1061 } else {
1062 is_in = 0;
1063 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1064 }
1065 if (!ep)
1066 return -ENOENT;
1067 switch(uurb->type) {
1068 case USBDEVFS_URB_TYPE_CONTROL:
1069 if (!usb_endpoint_xfer_control(&ep->desc))
1070 return -EINVAL;
1071 /* min 8 byte setup packet,
1072 * max 8 byte setup plus an arbitrary data stage */
1073 if (uurb->buffer_length < 8 ||
1074 uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1075 return -EINVAL;
1076 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1077 if (!dr)
1078 return -ENOMEM;
1079 if (copy_from_user(dr, uurb->buffer, 8)) {
1080 kfree(dr);
1081 return -EFAULT;
1082 }
1083 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1084 kfree(dr);
1085 return -EINVAL;
1086 }
1087 ret = check_ctrlrecip(ps, dr->bRequestType,
1088 le16_to_cpup(&dr->wIndex));
1089 if (ret) {
1090 kfree(dr);
1091 return ret;
1092 }
1093 uurb->number_of_packets = 0;
1094 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1095 uurb->buffer += 8;
1096 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1097 is_in = 1;
1098 uurb->endpoint |= USB_DIR_IN;
1099 } else {
1100 is_in = 0;
1101 uurb->endpoint &= ~USB_DIR_IN;
1102 }
1103 break;
1104
1105 case USBDEVFS_URB_TYPE_BULK:
1106 switch (usb_endpoint_type(&ep->desc)) {
1107 case USB_ENDPOINT_XFER_CONTROL:
1108 case USB_ENDPOINT_XFER_ISOC:
1109 return -EINVAL;
1110 /* allow single-shot interrupt transfers, at bogus rates */
1111 }
1112 uurb->number_of_packets = 0;
1113 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1114 return -EINVAL;
1115 break;
1116
1117 case USBDEVFS_URB_TYPE_ISO:
1118 /* arbitrary limit */
1119 if (uurb->number_of_packets < 1 ||
1120 uurb->number_of_packets > 128)
1121 return -EINVAL;
1122 if (!usb_endpoint_xfer_isoc(&ep->desc))
1123 return -EINVAL;
1124 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1125 uurb->number_of_packets;
1126 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1127 return -ENOMEM;
1128 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1129 kfree(isopkt);
1130 return -EFAULT;
1131 }
1132 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1133 /* arbitrary limit,
1134 * sufficient for USB 2.0 high-bandwidth iso */
1135 if (isopkt[u].length > 8192) {
1136 kfree(isopkt);
1137 return -EINVAL;
1138 }
1139 totlen += isopkt[u].length;
1140 }
1141 /* 3072 * 64 microframes */
1142 if (totlen > 196608) {
1143 kfree(isopkt);
1144 return -EINVAL;
1145 }
1146 uurb->buffer_length = totlen;
1147 break;
1148
1149 case USBDEVFS_URB_TYPE_INTERRUPT:
1150 uurb->number_of_packets = 0;
1151 if (!usb_endpoint_xfer_int(&ep->desc))
1152 return -EINVAL;
1153 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1154 return -EINVAL;
1155 break;
1156
1157 default:
1158 return -EINVAL;
1159 }
1160 if (uurb->buffer_length > 0 &&
1161 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1162 uurb->buffer, uurb->buffer_length)) {
1163 kfree(isopkt);
1164 kfree(dr);
1165 return -EFAULT;
1166 }
1167 as = alloc_async(uurb->number_of_packets);
1168 if (!as) {
1169 kfree(isopkt);
1170 kfree(dr);
1171 return -ENOMEM;
1172 }
1173 if (uurb->buffer_length > 0) {
1174 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1175 GFP_KERNEL);
1176 if (!as->urb->transfer_buffer) {
1177 kfree(isopkt);
1178 kfree(dr);
1179 free_async(as);
1180 return -ENOMEM;
1181 }
1182 /* Isochronous input data may end up being discontiguous
1183 * if some of the packets are short. Clear the buffer so
1184 * that the gaps don't leak kernel data to userspace.
1185 */
1186 if (is_in && uurb->type == USBDEVFS_URB_TYPE_ISO)
1187 memset(as->urb->transfer_buffer, 0,
1188 uurb->buffer_length);
1189 }
1190 as->urb->dev = ps->dev;
1191 as->urb->pipe = (uurb->type << 30) |
1192 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1193 (uurb->endpoint & USB_DIR_IN);
1194
1195 /* This tedious sequence is necessary because the URB_* flags
1196 * are internal to the kernel and subject to change, whereas
1197 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1198 */
1199 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1200 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1201 u |= URB_ISO_ASAP;
1202 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1203 u |= URB_SHORT_NOT_OK;
1204 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1205 u |= URB_NO_FSBR;
1206 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1207 u |= URB_ZERO_PACKET;
1208 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1209 u |= URB_NO_INTERRUPT;
1210 as->urb->transfer_flags = u;
1211
1212 as->urb->transfer_buffer_length = uurb->buffer_length;
1213 as->urb->setup_packet = (unsigned char *)dr;
1214 as->urb->start_frame = uurb->start_frame;
1215 as->urb->number_of_packets = uurb->number_of_packets;
1216 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1217 ps->dev->speed == USB_SPEED_HIGH)
1218 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1219 else
1220 as->urb->interval = ep->desc.bInterval;
1221 as->urb->context = as;
1222 as->urb->complete = async_completed;
1223 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1224 as->urb->iso_frame_desc[u].offset = totlen;
1225 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1226 totlen += isopkt[u].length;
1227 }
1228 kfree(isopkt);
1229 as->ps = ps;
1230 as->userurb = arg;
1231 if (is_in && uurb->buffer_length > 0)
1232 as->userbuffer = uurb->buffer;
1233 else
1234 as->userbuffer = NULL;
1235 as->signr = uurb->signr;
1236 as->ifnum = ifnum;
1237 as->pid = get_pid(task_pid(current));
1238 as->uid = cred->uid;
1239 as->euid = cred->euid;
1240 security_task_getsecid(current, &as->secid);
1241 if (!is_in && uurb->buffer_length > 0) {
1242 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1243 uurb->buffer_length)) {
1244 free_async(as);
1245 return -EFAULT;
1246 }
1247 }
1248 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1249 as->urb->transfer_buffer_length, 0, SUBMIT);
1250 async_newpending(as);
1251
1252 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1253 spin_lock_irq(&ps->lock);
1254
1255 /* Not exactly the endpoint address; the direction bit is
1256 * shifted to the 0x10 position so that the value will be
1257 * between 0 and 31.
1258 */
1259 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1260 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1261 >> 3);
1262
1263 /* If this bulk URB is the start of a new transfer, re-enable
1264 * the endpoint. Otherwise mark it as a continuation URB.
1265 */
1266 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1267 as->bulk_status = AS_CONTINUATION;
1268 else
1269 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1270
1271 /* Don't accept continuation URBs if the endpoint is
1272 * disabled because of an earlier error.
1273 */
1274 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1275 ret = -EREMOTEIO;
1276 else
1277 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1278 spin_unlock_irq(&ps->lock);
1279 } else {
1280 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1281 }
1282
1283 if (ret) {
1284 dev_printk(KERN_DEBUG, &ps->dev->dev,
1285 "usbfs: usb_submit_urb returned %d\n", ret);
1286 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1287 0, ret, COMPLETE);
1288 async_removepending(as);
1289 free_async(as);
1290 return ret;
1291 }
1292 return 0;
1293 }
1294
1295 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1296 {
1297 struct usbdevfs_urb uurb;
1298
1299 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1300 return -EFAULT;
1301
1302 return proc_do_submiturb(ps, &uurb,
1303 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1304 arg);
1305 }
1306
1307 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1308 {
1309 struct async *as;
1310
1311 as = async_getpending(ps, arg);
1312 if (!as)
1313 return -EINVAL;
1314 usb_kill_urb(as->urb);
1315 return 0;
1316 }
1317
1318 static int processcompl(struct async *as, void __user * __user *arg)
1319 {
1320 struct urb *urb = as->urb;
1321 struct usbdevfs_urb __user *userurb = as->userurb;
1322 void __user *addr = as->userurb;
1323 unsigned int i;
1324
1325 if (as->userbuffer && urb->actual_length) {
1326 if (urb->number_of_packets > 0) /* Isochronous */
1327 i = urb->transfer_buffer_length;
1328 else /* Non-Isoc */
1329 i = urb->actual_length;
1330 if (copy_to_user(as->userbuffer, urb->transfer_buffer, i))
1331 goto err_out;
1332 }
1333 if (put_user(as->status, &userurb->status))
1334 goto err_out;
1335 if (put_user(urb->actual_length, &userurb->actual_length))
1336 goto err_out;
1337 if (put_user(urb->error_count, &userurb->error_count))
1338 goto err_out;
1339
1340 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1341 for (i = 0; i < urb->number_of_packets; i++) {
1342 if (put_user(urb->iso_frame_desc[i].actual_length,
1343 &userurb->iso_frame_desc[i].actual_length))
1344 goto err_out;
1345 if (put_user(urb->iso_frame_desc[i].status,
1346 &userurb->iso_frame_desc[i].status))
1347 goto err_out;
1348 }
1349 }
1350
1351 if (put_user(addr, (void __user * __user *)arg))
1352 return -EFAULT;
1353 return 0;
1354
1355 err_out:
1356 return -EFAULT;
1357 }
1358
1359 static struct async *reap_as(struct dev_state *ps)
1360 {
1361 DECLARE_WAITQUEUE(wait, current);
1362 struct async *as = NULL;
1363 struct usb_device *dev = ps->dev;
1364
1365 add_wait_queue(&ps->wait, &wait);
1366 for (;;) {
1367 __set_current_state(TASK_INTERRUPTIBLE);
1368 as = async_getcompleted(ps);
1369 if (as)
1370 break;
1371 if (signal_pending(current))
1372 break;
1373 usb_unlock_device(dev);
1374 schedule();
1375 usb_lock_device(dev);
1376 }
1377 remove_wait_queue(&ps->wait, &wait);
1378 set_current_state(TASK_RUNNING);
1379 return as;
1380 }
1381
1382 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1383 {
1384 struct async *as = reap_as(ps);
1385 if (as) {
1386 int retval = processcompl(as, (void __user * __user *)arg);
1387 free_async(as);
1388 return retval;
1389 }
1390 if (signal_pending(current))
1391 return -EINTR;
1392 return -EIO;
1393 }
1394
1395 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1396 {
1397 int retval;
1398 struct async *as;
1399
1400 as = async_getcompleted(ps);
1401 retval = -EAGAIN;
1402 if (as) {
1403 retval = processcompl(as, (void __user * __user *)arg);
1404 free_async(as);
1405 }
1406 return retval;
1407 }
1408
1409 #ifdef CONFIG_COMPAT
1410
1411 static int get_urb32(struct usbdevfs_urb *kurb,
1412 struct usbdevfs_urb32 __user *uurb)
1413 {
1414 __u32 uptr;
1415 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1416 __get_user(kurb->type, &uurb->type) ||
1417 __get_user(kurb->endpoint, &uurb->endpoint) ||
1418 __get_user(kurb->status, &uurb->status) ||
1419 __get_user(kurb->flags, &uurb->flags) ||
1420 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1421 __get_user(kurb->actual_length, &uurb->actual_length) ||
1422 __get_user(kurb->start_frame, &uurb->start_frame) ||
1423 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1424 __get_user(kurb->error_count, &uurb->error_count) ||
1425 __get_user(kurb->signr, &uurb->signr))
1426 return -EFAULT;
1427
1428 if (__get_user(uptr, &uurb->buffer))
1429 return -EFAULT;
1430 kurb->buffer = compat_ptr(uptr);
1431 if (__get_user(uptr, &uurb->usercontext))
1432 return -EFAULT;
1433 kurb->usercontext = compat_ptr(uptr);
1434
1435 return 0;
1436 }
1437
1438 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1439 {
1440 struct usbdevfs_urb uurb;
1441
1442 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1443 return -EFAULT;
1444
1445 return proc_do_submiturb(ps, &uurb,
1446 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1447 arg);
1448 }
1449
1450 static int processcompl_compat(struct async *as, void __user * __user *arg)
1451 {
1452 struct urb *urb = as->urb;
1453 struct usbdevfs_urb32 __user *userurb = as->userurb;
1454 void __user *addr = as->userurb;
1455 unsigned int i;
1456
1457 if (as->userbuffer && urb->actual_length) {
1458 if (urb->number_of_packets > 0) /* Isochronous */
1459 i = urb->transfer_buffer_length;
1460 else /* Non-Isoc */
1461 i = urb->actual_length;
1462 if (copy_to_user(as->userbuffer, urb->transfer_buffer, i))
1463 return -EFAULT;
1464 }
1465 if (put_user(as->status, &userurb->status))
1466 return -EFAULT;
1467 if (put_user(urb->actual_length, &userurb->actual_length))
1468 return -EFAULT;
1469 if (put_user(urb->error_count, &userurb->error_count))
1470 return -EFAULT;
1471
1472 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1473 for (i = 0; i < urb->number_of_packets; i++) {
1474 if (put_user(urb->iso_frame_desc[i].actual_length,
1475 &userurb->iso_frame_desc[i].actual_length))
1476 return -EFAULT;
1477 if (put_user(urb->iso_frame_desc[i].status,
1478 &userurb->iso_frame_desc[i].status))
1479 return -EFAULT;
1480 }
1481 }
1482
1483 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1484 return -EFAULT;
1485 return 0;
1486 }
1487
1488 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1489 {
1490 struct async *as = reap_as(ps);
1491 if (as) {
1492 int retval = processcompl_compat(as, (void __user * __user *)arg);
1493 free_async(as);
1494 return retval;
1495 }
1496 if (signal_pending(current))
1497 return -EINTR;
1498 return -EIO;
1499 }
1500
1501 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1502 {
1503 int retval;
1504 struct async *as;
1505
1506 retval = -EAGAIN;
1507 as = async_getcompleted(ps);
1508 if (as) {
1509 retval = processcompl_compat(as, (void __user * __user *)arg);
1510 free_async(as);
1511 }
1512 return retval;
1513 }
1514
1515 #endif
1516
1517 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1518 {
1519 struct usbdevfs_disconnectsignal ds;
1520
1521 if (copy_from_user(&ds, arg, sizeof(ds)))
1522 return -EFAULT;
1523 ps->discsignr = ds.signr;
1524 ps->disccontext = ds.context;
1525 return 0;
1526 }
1527
1528 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1529 {
1530 unsigned int ifnum;
1531
1532 if (get_user(ifnum, (unsigned int __user *)arg))
1533 return -EFAULT;
1534 return claimintf(ps, ifnum);
1535 }
1536
1537 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1538 {
1539 unsigned int ifnum;
1540 int ret;
1541
1542 if (get_user(ifnum, (unsigned int __user *)arg))
1543 return -EFAULT;
1544 if ((ret = releaseintf(ps, ifnum)) < 0)
1545 return ret;
1546 destroy_async_on_interface (ps, ifnum);
1547 return 0;
1548 }
1549
1550 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1551 {
1552 int size;
1553 void *buf = NULL;
1554 int retval = 0;
1555 struct usb_interface *intf = NULL;
1556 struct usb_driver *driver = NULL;
1557
1558 /* alloc buffer */
1559 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1560 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1561 return -ENOMEM;
1562 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1563 if (copy_from_user(buf, ctl->data, size)) {
1564 kfree(buf);
1565 return -EFAULT;
1566 }
1567 } else {
1568 memset(buf, 0, size);
1569 }
1570 }
1571
1572 if (!connected(ps)) {
1573 kfree(buf);
1574 return -ENODEV;
1575 }
1576
1577 if (ps->dev->state != USB_STATE_CONFIGURED)
1578 retval = -EHOSTUNREACH;
1579 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1580 retval = -EINVAL;
1581 else switch (ctl->ioctl_code) {
1582
1583 /* disconnect kernel driver from interface */
1584 case USBDEVFS_DISCONNECT:
1585 if (intf->dev.driver) {
1586 driver = to_usb_driver(intf->dev.driver);
1587 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1588 usb_driver_release_interface(driver, intf);
1589 } else
1590 retval = -ENODATA;
1591 break;
1592
1593 /* let kernel drivers try to (re)bind to the interface */
1594 case USBDEVFS_CONNECT:
1595 if (!intf->dev.driver)
1596 retval = device_attach(&intf->dev);
1597 else
1598 retval = -EBUSY;
1599 break;
1600
1601 /* talk directly to the interface's driver */
1602 default:
1603 if (intf->dev.driver)
1604 driver = to_usb_driver(intf->dev.driver);
1605 if (driver == NULL || driver->ioctl == NULL) {
1606 retval = -ENOTTY;
1607 } else {
1608 retval = driver->ioctl(intf, ctl->ioctl_code, buf);
1609 if (retval == -ENOIOCTLCMD)
1610 retval = -ENOTTY;
1611 }
1612 }
1613
1614 /* cleanup and return */
1615 if (retval >= 0
1616 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1617 && size > 0
1618 && copy_to_user(ctl->data, buf, size) != 0)
1619 retval = -EFAULT;
1620
1621 kfree(buf);
1622 return retval;
1623 }
1624
1625 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1626 {
1627 struct usbdevfs_ioctl ctrl;
1628
1629 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1630 return -EFAULT;
1631 return proc_ioctl(ps, &ctrl);
1632 }
1633
1634 #ifdef CONFIG_COMPAT
1635 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1636 {
1637 struct usbdevfs_ioctl32 __user *uioc;
1638 struct usbdevfs_ioctl ctrl;
1639 u32 udata;
1640
1641 uioc = compat_ptr((long)arg);
1642 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1643 __get_user(ctrl.ifno, &uioc->ifno) ||
1644 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1645 __get_user(udata, &uioc->data))
1646 return -EFAULT;
1647 ctrl.data = compat_ptr(udata);
1648
1649 return proc_ioctl(ps, &ctrl);
1650 }
1651 #endif
1652
1653 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1654 {
1655 unsigned portnum;
1656 int rc;
1657
1658 if (get_user(portnum, (unsigned __user *) arg))
1659 return -EFAULT;
1660 rc = usb_hub_claim_port(ps->dev, portnum, ps);
1661 if (rc == 0)
1662 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1663 portnum, task_pid_nr(current), current->comm);
1664 return rc;
1665 }
1666
1667 static int proc_release_port(struct dev_state *ps, void __user *arg)
1668 {
1669 unsigned portnum;
1670
1671 if (get_user(portnum, (unsigned __user *) arg))
1672 return -EFAULT;
1673 return usb_hub_release_port(ps->dev, portnum, ps);
1674 }
1675
1676 /*
1677 * NOTE: All requests here that have interface numbers as parameters
1678 * are assuming that somehow the configuration has been prevented from
1679 * changing. But there's no mechanism to ensure that...
1680 */
1681 static int usbdev_ioctl(struct inode *inode, struct file *file,
1682 unsigned int cmd, unsigned long arg)
1683 {
1684 struct dev_state *ps = file->private_data;
1685 struct usb_device *dev = ps->dev;
1686 void __user *p = (void __user *)arg;
1687 int ret = -ENOTTY;
1688
1689 if (!(file->f_mode & FMODE_WRITE))
1690 return -EPERM;
1691 usb_lock_device(dev);
1692 if (!connected(ps)) {
1693 usb_unlock_device(dev);
1694 return -ENODEV;
1695 }
1696
1697 switch (cmd) {
1698 case USBDEVFS_CONTROL:
1699 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1700 ret = proc_control(ps, p);
1701 if (ret >= 0)
1702 inode->i_mtime = CURRENT_TIME;
1703 break;
1704
1705 case USBDEVFS_BULK:
1706 snoop(&dev->dev, "%s: BULK\n", __func__);
1707 ret = proc_bulk(ps, p);
1708 if (ret >= 0)
1709 inode->i_mtime = CURRENT_TIME;
1710 break;
1711
1712 case USBDEVFS_RESETEP:
1713 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1714 ret = proc_resetep(ps, p);
1715 if (ret >= 0)
1716 inode->i_mtime = CURRENT_TIME;
1717 break;
1718
1719 case USBDEVFS_RESET:
1720 snoop(&dev->dev, "%s: RESET\n", __func__);
1721 ret = proc_resetdevice(ps);
1722 break;
1723
1724 case USBDEVFS_CLEAR_HALT:
1725 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1726 ret = proc_clearhalt(ps, p);
1727 if (ret >= 0)
1728 inode->i_mtime = CURRENT_TIME;
1729 break;
1730
1731 case USBDEVFS_GETDRIVER:
1732 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1733 ret = proc_getdriver(ps, p);
1734 break;
1735
1736 case USBDEVFS_CONNECTINFO:
1737 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1738 ret = proc_connectinfo(ps, p);
1739 break;
1740
1741 case USBDEVFS_SETINTERFACE:
1742 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1743 ret = proc_setintf(ps, p);
1744 break;
1745
1746 case USBDEVFS_SETCONFIGURATION:
1747 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1748 ret = proc_setconfig(ps, p);
1749 break;
1750
1751 case USBDEVFS_SUBMITURB:
1752 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1753 ret = proc_submiturb(ps, p);
1754 if (ret >= 0)
1755 inode->i_mtime = CURRENT_TIME;
1756 break;
1757
1758 #ifdef CONFIG_COMPAT
1759
1760 case USBDEVFS_SUBMITURB32:
1761 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1762 ret = proc_submiturb_compat(ps, p);
1763 if (ret >= 0)
1764 inode->i_mtime = CURRENT_TIME;
1765 break;
1766
1767 case USBDEVFS_REAPURB32:
1768 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1769 ret = proc_reapurb_compat(ps, p);
1770 break;
1771
1772 case USBDEVFS_REAPURBNDELAY32:
1773 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
1774 ret = proc_reapurbnonblock_compat(ps, p);
1775 break;
1776
1777 case USBDEVFS_IOCTL32:
1778 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1779 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1780 break;
1781 #endif
1782
1783 case USBDEVFS_DISCARDURB:
1784 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1785 ret = proc_unlinkurb(ps, p);
1786 break;
1787
1788 case USBDEVFS_REAPURB:
1789 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1790 ret = proc_reapurb(ps, p);
1791 break;
1792
1793 case USBDEVFS_REAPURBNDELAY:
1794 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
1795 ret = proc_reapurbnonblock(ps, p);
1796 break;
1797
1798 case USBDEVFS_DISCSIGNAL:
1799 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1800 ret = proc_disconnectsignal(ps, p);
1801 break;
1802
1803 case USBDEVFS_CLAIMINTERFACE:
1804 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1805 ret = proc_claiminterface(ps, p);
1806 break;
1807
1808 case USBDEVFS_RELEASEINTERFACE:
1809 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1810 ret = proc_releaseinterface(ps, p);
1811 break;
1812
1813 case USBDEVFS_IOCTL:
1814 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1815 ret = proc_ioctl_default(ps, p);
1816 break;
1817
1818 case USBDEVFS_CLAIM_PORT:
1819 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
1820 ret = proc_claim_port(ps, p);
1821 break;
1822
1823 case USBDEVFS_RELEASE_PORT:
1824 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
1825 ret = proc_release_port(ps, p);
1826 break;
1827 }
1828 usb_unlock_device(dev);
1829 if (ret >= 0)
1830 inode->i_atime = CURRENT_TIME;
1831 return ret;
1832 }
1833
1834 /* No kernel lock - fine */
1835 static unsigned int usbdev_poll(struct file *file,
1836 struct poll_table_struct *wait)
1837 {
1838 struct dev_state *ps = file->private_data;
1839 unsigned int mask = 0;
1840
1841 poll_wait(file, &ps->wait, wait);
1842 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1843 mask |= POLLOUT | POLLWRNORM;
1844 if (!connected(ps))
1845 mask |= POLLERR | POLLHUP;
1846 return mask;
1847 }
1848
1849 const struct file_operations usbdev_file_operations = {
1850 .owner = THIS_MODULE,
1851 .llseek = usbdev_lseek,
1852 .read = usbdev_read,
1853 .poll = usbdev_poll,
1854 .ioctl = usbdev_ioctl,
1855 .open = usbdev_open,
1856 .release = usbdev_release,
1857 };
1858
1859 static void usbdev_remove(struct usb_device *udev)
1860 {
1861 struct dev_state *ps;
1862 struct siginfo sinfo;
1863
1864 while (!list_empty(&udev->filelist)) {
1865 ps = list_entry(udev->filelist.next, struct dev_state, list);
1866 destroy_all_async(ps);
1867 wake_up_all(&ps->wait);
1868 list_del_init(&ps->list);
1869 if (ps->discsignr) {
1870 sinfo.si_signo = ps->discsignr;
1871 sinfo.si_errno = EPIPE;
1872 sinfo.si_code = SI_ASYNCIO;
1873 sinfo.si_addr = ps->disccontext;
1874 kill_pid_info_as_uid(ps->discsignr, &sinfo,
1875 ps->disc_pid, ps->disc_uid,
1876 ps->disc_euid, ps->secid);
1877 }
1878 }
1879 }
1880
1881 #ifdef CONFIG_USB_DEVICE_CLASS
1882 static struct class *usb_classdev_class;
1883
1884 static int usb_classdev_add(struct usb_device *dev)
1885 {
1886 struct device *cldev;
1887
1888 cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
1889 NULL, "usbdev%d.%d", dev->bus->busnum,
1890 dev->devnum);
1891 if (IS_ERR(cldev))
1892 return PTR_ERR(cldev);
1893 dev->usb_classdev = cldev;
1894 return 0;
1895 }
1896
1897 static void usb_classdev_remove(struct usb_device *dev)
1898 {
1899 if (dev->usb_classdev)
1900 device_unregister(dev->usb_classdev);
1901 }
1902
1903 #else
1904 #define usb_classdev_add(dev) 0
1905 #define usb_classdev_remove(dev) do {} while (0)
1906
1907 #endif
1908
1909 static int usbdev_notify(struct notifier_block *self,
1910 unsigned long action, void *dev)
1911 {
1912 switch (action) {
1913 case USB_DEVICE_ADD:
1914 if (usb_classdev_add(dev))
1915 return NOTIFY_BAD;
1916 break;
1917 case USB_DEVICE_REMOVE:
1918 usb_classdev_remove(dev);
1919 usbdev_remove(dev);
1920 break;
1921 }
1922 return NOTIFY_OK;
1923 }
1924
1925 static struct notifier_block usbdev_nb = {
1926 .notifier_call = usbdev_notify,
1927 };
1928
1929 static struct cdev usb_device_cdev;
1930
1931 int __init usb_devio_init(void)
1932 {
1933 int retval;
1934
1935 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1936 "usb_device");
1937 if (retval) {
1938 printk(KERN_ERR "Unable to register minors for usb_device\n");
1939 goto out;
1940 }
1941 cdev_init(&usb_device_cdev, &usbdev_file_operations);
1942 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1943 if (retval) {
1944 printk(KERN_ERR "Unable to get usb_device major %d\n",
1945 USB_DEVICE_MAJOR);
1946 goto error_cdev;
1947 }
1948 #ifdef CONFIG_USB_DEVICE_CLASS
1949 usb_classdev_class = class_create(THIS_MODULE, "usb_device");
1950 if (IS_ERR(usb_classdev_class)) {
1951 printk(KERN_ERR "Unable to register usb_device class\n");
1952 retval = PTR_ERR(usb_classdev_class);
1953 cdev_del(&usb_device_cdev);
1954 usb_classdev_class = NULL;
1955 goto out;
1956 }
1957 /* devices of this class shadow the major:minor of their parent
1958 * device, so clear ->dev_kobj to prevent adding duplicate entries
1959 * to /sys/dev
1960 */
1961 usb_classdev_class->dev_kobj = NULL;
1962 #endif
1963 usb_register_notify(&usbdev_nb);
1964 out:
1965 return retval;
1966
1967 error_cdev:
1968 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1969 goto out;
1970 }
1971
1972 void usb_devio_cleanup(void)
1973 {
1974 usb_unregister_notify(&usbdev_nb);
1975 #ifdef CONFIG_USB_DEVICE_CLASS
1976 class_destroy(usb_classdev_class);
1977 #endif
1978 cdev_del(&usb_device_cdev);
1979 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1980 }
Linux ARM platform port for MOXA ART SoC