USB: fix typo in wMaxPacketSize validation
[pandora-kernel.git] / drivers / usb / core / devio.c
1 /*****************************************************************************/
2
3 /*
4  *      devio.c  --  User space communication with USB devices.
5  *
6  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
7  *
8  *      This program is free software; you can redistribute it and/or modify
9  *      it under the terms of the GNU General Public License as published by
10  *      the Free Software Foundation; either version 2 of the License, or
11  *      (at your option) any later version.
12  *
13  *      This program is distributed in the hope that it will be useful,
14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  *      GNU General Public License for more details.
17  *
18  *      You should have received a copy of the GNU General Public License
19  *      along with this program; if not, write to the Free Software
20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21  *
22  *  This file implements the usbfs/x/y files, where
23  *  x is the bus number and y the device number.
24  *
25  *  It allows user space programs/"drivers" to communicate directly
26  *  with USB devices without intervening kernel driver.
27  *
28  *  Revision history
29  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
30  *    04.01.2000   0.2   Turned into its own filesystem
31  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
32  *                       (CAN-2005-3055)
33  */
34
35 /*****************************************************************************/
36
37 #include <linux/fs.h>
38 #include <linux/mm.h>
39 #include <linux/slab.h>
40 #include <linux/signal.h>
41 #include <linux/poll.h>
42 #include <linux/module.h>
43 #include <linux/usb.h>
44 #include <linux/usbdevice_fs.h>
45 #include <linux/usb/hcd.h>      /* for usbcore internals */
46 #include <linux/cdev.h>
47 #include <linux/notifier.h>
48 #include <linux/security.h>
49 #include <linux/user_namespace.h>
50 #include <asm/uaccess.h>
51 #include <asm/byteorder.h>
52 #include <linux/moduleparam.h>
53
54 #include "usb.h"
55
56 #define USB_MAXBUS                      64
57 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
58
59 /* Mutual exclusion for removal, open, and release */
60 DEFINE_MUTEX(usbfs_mutex);
61
62 struct dev_state {
63         struct list_head list;      /* state list */
64         struct usb_device *dev;
65         struct file *file;
66         spinlock_t lock;            /* protects the async urb lists */
67         struct list_head async_pending;
68         struct list_head async_completed;
69         wait_queue_head_t wait;     /* wake up if a request completed */
70         unsigned int discsignr;
71         struct pid *disc_pid;
72         const struct cred *cred;
73         void __user *disccontext;
74         unsigned long ifclaimed;
75         u32 secid;
76         u32 disabled_bulk_eps;
77 };
78
79 struct async {
80         struct list_head asynclist;
81         struct dev_state *ps;
82         struct pid *pid;
83         const struct cred *cred;
84         unsigned int signr;
85         unsigned int ifnum;
86         void __user *userbuffer;
87         void __user *userurb;
88         struct urb *urb;
89         int status;
90         u32 secid;
91         u8 bulk_addr;
92         u8 bulk_status;
93 };
94
95 static int usbfs_snoop;
96 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
97 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
98
99 #define snoop(dev, format, arg...)                              \
100         do {                                                    \
101                 if (usbfs_snoop)                                \
102                         dev_info(dev , format , ## arg);        \
103         } while (0)
104
105 enum snoop_when {
106         SUBMIT, COMPLETE
107 };
108
109 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
110
111 #define MAX_USBFS_BUFFER_SIZE   16384
112
113
114 static int connected(struct dev_state *ps)
115 {
116         return (!list_empty(&ps->list) &&
117                         ps->dev->state != USB_STATE_NOTATTACHED);
118 }
119
120 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
121 {
122         loff_t ret;
123
124         mutex_lock(&file->f_dentry->d_inode->i_mutex);
125
126         switch (orig) {
127         case 0:
128                 file->f_pos = offset;
129                 ret = file->f_pos;
130                 break;
131         case 1:
132                 file->f_pos += offset;
133                 ret = file->f_pos;
134                 break;
135         case 2:
136         default:
137                 ret = -EINVAL;
138         }
139
140         mutex_unlock(&file->f_dentry->d_inode->i_mutex);
141         return ret;
142 }
143
144 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
145                            loff_t *ppos)
146 {
147         struct dev_state *ps = file->private_data;
148         struct usb_device *dev = ps->dev;
149         ssize_t ret = 0;
150         unsigned len;
151         loff_t pos;
152         int i;
153
154         pos = *ppos;
155         usb_lock_device(dev);
156         if (!connected(ps)) {
157                 ret = -ENODEV;
158                 goto err;
159         } else if (pos < 0) {
160                 ret = -EINVAL;
161                 goto err;
162         }
163
164         if (pos < sizeof(struct usb_device_descriptor)) {
165                 /* 18 bytes - fits on the stack */
166                 struct usb_device_descriptor temp_desc;
167
168                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
169                 le16_to_cpus(&temp_desc.bcdUSB);
170                 le16_to_cpus(&temp_desc.idVendor);
171                 le16_to_cpus(&temp_desc.idProduct);
172                 le16_to_cpus(&temp_desc.bcdDevice);
173
174                 len = sizeof(struct usb_device_descriptor) - pos;
175                 if (len > nbytes)
176                         len = nbytes;
177                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
178                         ret = -EFAULT;
179                         goto err;
180                 }
181
182                 *ppos += len;
183                 buf += len;
184                 nbytes -= len;
185                 ret += len;
186         }
187
188         pos = sizeof(struct usb_device_descriptor);
189         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
190                 struct usb_config_descriptor *config =
191                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
192                 unsigned int length = le16_to_cpu(config->wTotalLength);
193
194                 if (*ppos < pos + length) {
195
196                         /* The descriptor may claim to be longer than it
197                          * really is.  Here is the actual allocated length. */
198                         unsigned alloclen =
199                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
200
201                         len = length - (*ppos - pos);
202                         if (len > nbytes)
203                                 len = nbytes;
204
205                         /* Simply don't write (skip over) unallocated parts */
206                         if (alloclen > (*ppos - pos)) {
207                                 alloclen -= (*ppos - pos);
208                                 if (copy_to_user(buf,
209                                     dev->rawdescriptors[i] + (*ppos - pos),
210                                     min(len, alloclen))) {
211                                         ret = -EFAULT;
212                                         goto err;
213                                 }
214                         }
215
216                         *ppos += len;
217                         buf += len;
218                         nbytes -= len;
219                         ret += len;
220                 }
221
222                 pos += length;
223         }
224
225 err:
226         usb_unlock_device(dev);
227         return ret;
228 }
229
230 /*
231  * async list handling
232  */
233
234 static struct async *alloc_async(unsigned int numisoframes)
235 {
236         struct async *as;
237
238         as = kzalloc(sizeof(struct async), GFP_KERNEL);
239         if (!as)
240                 return NULL;
241         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
242         if (!as->urb) {
243                 kfree(as);
244                 return NULL;
245         }
246         return as;
247 }
248
249 static void free_async(struct async *as)
250 {
251         put_pid(as->pid);
252         if (as->cred)
253                 put_cred(as->cred);
254         kfree(as->urb->transfer_buffer);
255         kfree(as->urb->setup_packet);
256         usb_free_urb(as->urb);
257         kfree(as);
258 }
259
260 static void async_newpending(struct async *as)
261 {
262         struct dev_state *ps = as->ps;
263         unsigned long flags;
264
265         spin_lock_irqsave(&ps->lock, flags);
266         list_add_tail(&as->asynclist, &ps->async_pending);
267         spin_unlock_irqrestore(&ps->lock, flags);
268 }
269
270 static void async_removepending(struct async *as)
271 {
272         struct dev_state *ps = as->ps;
273         unsigned long flags;
274
275         spin_lock_irqsave(&ps->lock, flags);
276         list_del_init(&as->asynclist);
277         spin_unlock_irqrestore(&ps->lock, flags);
278 }
279
280 static struct async *async_getcompleted(struct dev_state *ps)
281 {
282         unsigned long flags;
283         struct async *as = NULL;
284
285         spin_lock_irqsave(&ps->lock, flags);
286         if (!list_empty(&ps->async_completed)) {
287                 as = list_entry(ps->async_completed.next, struct async,
288                                 asynclist);
289                 list_del_init(&as->asynclist);
290         }
291         spin_unlock_irqrestore(&ps->lock, flags);
292         return as;
293 }
294
295 static struct async *async_getpending(struct dev_state *ps,
296                                              void __user *userurb)
297 {
298         struct async *as;
299
300         list_for_each_entry(as, &ps->async_pending, asynclist)
301                 if (as->userurb == userurb) {
302                         list_del_init(&as->asynclist);
303                         return as;
304                 }
305
306         return NULL;
307 }
308
309 static void snoop_urb(struct usb_device *udev,
310                 void __user *userurb, int pipe, unsigned length,
311                 int timeout_or_status, enum snoop_when when,
312                 unsigned char *data, unsigned data_len)
313 {
314         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
315         static const char *dirs[] = {"out", "in"};
316         int ep;
317         const char *t, *d;
318
319         if (!usbfs_snoop)
320                 return;
321
322         ep = usb_pipeendpoint(pipe);
323         t = types[usb_pipetype(pipe)];
324         d = dirs[!!usb_pipein(pipe)];
325
326         if (userurb) {          /* Async */
327                 if (when == SUBMIT)
328                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
329                                         "length %u\n",
330                                         userurb, ep, t, d, length);
331                 else
332                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
333                                         "actual_length %u status %d\n",
334                                         userurb, ep, t, d, length,
335                                         timeout_or_status);
336         } else {
337                 if (when == SUBMIT)
338                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
339                                         "timeout %d\n",
340                                         ep, t, d, length, timeout_or_status);
341                 else
342                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
343                                         "status %d\n",
344                                         ep, t, d, length, timeout_or_status);
345         }
346
347         if (data && data_len > 0) {
348                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
349                         data, data_len, 1);
350         }
351 }
352
353 #define AS_CONTINUATION 1
354 #define AS_UNLINK       2
355
356 static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr)
357 __releases(ps->lock)
358 __acquires(ps->lock)
359 {
360         struct urb *urb;
361         struct async *as;
362
363         /* Mark all the pending URBs that match bulk_addr, up to but not
364          * including the first one without AS_CONTINUATION.  If such an
365          * URB is encountered then a new transfer has already started so
366          * the endpoint doesn't need to be disabled; otherwise it does.
367          */
368         list_for_each_entry(as, &ps->async_pending, asynclist) {
369                 if (as->bulk_addr == bulk_addr) {
370                         if (as->bulk_status != AS_CONTINUATION)
371                                 goto rescan;
372                         as->bulk_status = AS_UNLINK;
373                         as->bulk_addr = 0;
374                 }
375         }
376         ps->disabled_bulk_eps |= (1 << bulk_addr);
377
378         /* Now carefully unlink all the marked pending URBs */
379  rescan:
380         list_for_each_entry(as, &ps->async_pending, asynclist) {
381                 if (as->bulk_status == AS_UNLINK) {
382                         as->bulk_status = 0;            /* Only once */
383                         urb = as->urb;
384                         usb_get_urb(urb);
385                         spin_unlock(&ps->lock);         /* Allow completions */
386                         usb_unlink_urb(urb);
387                         usb_put_urb(urb);
388                         spin_lock(&ps->lock);
389                         goto rescan;
390                 }
391         }
392 }
393
394 static void async_completed(struct urb *urb)
395 {
396         struct async *as = urb->context;
397         struct dev_state *ps = as->ps;
398         struct siginfo sinfo;
399         struct pid *pid = NULL;
400         u32 secid = 0;
401         const struct cred *cred = NULL;
402         int signr;
403
404         spin_lock(&ps->lock);
405         list_move_tail(&as->asynclist, &ps->async_completed);
406         as->status = urb->status;
407         signr = as->signr;
408         if (signr) {
409                 memset(&sinfo, 0, sizeof(sinfo));
410                 sinfo.si_signo = as->signr;
411                 sinfo.si_errno = as->status;
412                 sinfo.si_code = SI_ASYNCIO;
413                 sinfo.si_addr = as->userurb;
414                 pid = get_pid(as->pid);
415                 cred = get_cred(as->cred);
416                 secid = as->secid;
417         }
418         snoop(&urb->dev->dev, "urb complete\n");
419         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
420                         as->status, COMPLETE,
421                         ((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_OUT) ?
422                                 NULL : urb->transfer_buffer, urb->actual_length);
423         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
424                         as->status != -ENOENT)
425                 cancel_bulk_urbs(ps, as->bulk_addr);
426         spin_unlock(&ps->lock);
427
428         if (signr) {
429                 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
430                 put_pid(pid);
431                 put_cred(cred);
432         }
433
434         wake_up(&ps->wait);
435 }
436
437 static void destroy_async(struct dev_state *ps, struct list_head *list)
438 {
439         struct urb *urb;
440         struct async *as;
441         unsigned long flags;
442
443         spin_lock_irqsave(&ps->lock, flags);
444         while (!list_empty(list)) {
445                 as = list_entry(list->next, struct async, asynclist);
446                 list_del_init(&as->asynclist);
447                 urb = as->urb;
448                 usb_get_urb(urb);
449
450                 /* drop the spinlock so the completion handler can run */
451                 spin_unlock_irqrestore(&ps->lock, flags);
452                 usb_kill_urb(urb);
453                 usb_put_urb(urb);
454                 spin_lock_irqsave(&ps->lock, flags);
455         }
456         spin_unlock_irqrestore(&ps->lock, flags);
457 }
458
459 static void destroy_async_on_interface(struct dev_state *ps,
460                                        unsigned int ifnum)
461 {
462         struct list_head *p, *q, hitlist;
463         unsigned long flags;
464
465         INIT_LIST_HEAD(&hitlist);
466         spin_lock_irqsave(&ps->lock, flags);
467         list_for_each_safe(p, q, &ps->async_pending)
468                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
469                         list_move_tail(p, &hitlist);
470         spin_unlock_irqrestore(&ps->lock, flags);
471         destroy_async(ps, &hitlist);
472 }
473
474 static void destroy_all_async(struct dev_state *ps)
475 {
476         destroy_async(ps, &ps->async_pending);
477 }
478
479 /*
480  * interface claims are made only at the request of user level code,
481  * which can also release them (explicitly or by closing files).
482  * they're also undone when devices disconnect.
483  */
484
485 static int driver_probe(struct usb_interface *intf,
486                         const struct usb_device_id *id)
487 {
488         return -ENODEV;
489 }
490
491 static void driver_disconnect(struct usb_interface *intf)
492 {
493         struct dev_state *ps = usb_get_intfdata(intf);
494         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
495
496         if (!ps)
497                 return;
498
499         /* NOTE:  this relies on usbcore having canceled and completed
500          * all pending I/O requests; 2.6 does that.
501          */
502
503         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
504                 clear_bit(ifnum, &ps->ifclaimed);
505         else
506                 dev_warn(&intf->dev, "interface number %u out of range\n",
507                          ifnum);
508
509         usb_set_intfdata(intf, NULL);
510
511         /* force async requests to complete */
512         destroy_async_on_interface(ps, ifnum);
513 }
514
515 /* The following routines are merely placeholders.  There is no way
516  * to inform a user task about suspend or resumes.
517  */
518 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
519 {
520         return 0;
521 }
522
523 static int driver_resume(struct usb_interface *intf)
524 {
525         return 0;
526 }
527
528 struct usb_driver usbfs_driver = {
529         .name =         "usbfs",
530         .probe =        driver_probe,
531         .disconnect =   driver_disconnect,
532         .suspend =      driver_suspend,
533         .resume =       driver_resume,
534 };
535
536 static int claimintf(struct dev_state *ps, unsigned int ifnum)
537 {
538         struct usb_device *dev = ps->dev;
539         struct usb_interface *intf;
540         int err;
541
542         if (ifnum >= 8*sizeof(ps->ifclaimed))
543                 return -EINVAL;
544         /* already claimed */
545         if (test_bit(ifnum, &ps->ifclaimed))
546                 return 0;
547
548         intf = usb_ifnum_to_if(dev, ifnum);
549         if (!intf)
550                 err = -ENOENT;
551         else
552                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
553         if (err == 0)
554                 set_bit(ifnum, &ps->ifclaimed);
555         return err;
556 }
557
558 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
559 {
560         struct usb_device *dev;
561         struct usb_interface *intf;
562         int err;
563
564         err = -EINVAL;
565         if (ifnum >= 8*sizeof(ps->ifclaimed))
566                 return err;
567         dev = ps->dev;
568         intf = usb_ifnum_to_if(dev, ifnum);
569         if (!intf)
570                 err = -ENOENT;
571         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
572                 usb_driver_release_interface(&usbfs_driver, intf);
573                 err = 0;
574         }
575         return err;
576 }
577
578 static int checkintf(struct dev_state *ps, unsigned int ifnum)
579 {
580         if (ps->dev->state != USB_STATE_CONFIGURED)
581                 return -EHOSTUNREACH;
582         if (ifnum >= 8*sizeof(ps->ifclaimed))
583                 return -EINVAL;
584         if (test_bit(ifnum, &ps->ifclaimed))
585                 return 0;
586         /* if not yet claimed, claim it for the driver */
587         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
588                  "interface %u before use\n", task_pid_nr(current),
589                  current->comm, ifnum);
590         return claimintf(ps, ifnum);
591 }
592
593 static int findintfep(struct usb_device *dev, unsigned int ep)
594 {
595         unsigned int i, j, e;
596         struct usb_interface *intf;
597         struct usb_host_interface *alts;
598         struct usb_endpoint_descriptor *endpt;
599
600         if (ep & ~(USB_DIR_IN|0xf))
601                 return -EINVAL;
602         if (!dev->actconfig)
603                 return -ESRCH;
604         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
605                 intf = dev->actconfig->interface[i];
606                 for (j = 0; j < intf->num_altsetting; j++) {
607                         alts = &intf->altsetting[j];
608                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
609                                 endpt = &alts->endpoint[e].desc;
610                                 if (endpt->bEndpointAddress == ep)
611                                         return alts->desc.bInterfaceNumber;
612                         }
613                 }
614         }
615         return -ENOENT;
616 }
617
618 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
619                            unsigned int request, unsigned int index)
620 {
621         int ret = 0;
622         struct usb_host_interface *alt_setting;
623
624         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
625          && ps->dev->state != USB_STATE_ADDRESS
626          && ps->dev->state != USB_STATE_CONFIGURED)
627                 return -EHOSTUNREACH;
628         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
629                 return 0;
630
631         /*
632          * check for the special corner case 'get_device_id' in the printer
633          * class specification, where wIndex is (interface << 8 | altsetting)
634          * instead of just interface
635          */
636         if (requesttype == 0xa1 && request == 0) {
637                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
638                                                    index >> 8, index & 0xff);
639                 if (alt_setting
640                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
641                         index >>= 8;
642         }
643
644         index &= 0xff;
645         switch (requesttype & USB_RECIP_MASK) {
646         case USB_RECIP_ENDPOINT:
647                 if ((index & ~USB_DIR_IN) == 0)
648                         return 0;
649                 ret = findintfep(ps->dev, index);
650                 if (ret < 0) {
651                         /*
652                          * Some not fully compliant Win apps seem to get
653                          * index wrong and have the endpoint number here
654                          * rather than the endpoint address (with the
655                          * correct direction). Win does let this through,
656                          * so we'll not reject it here but leave it to
657                          * the device to not break KVM. But we warn.
658                          */
659                         ret = findintfep(ps->dev, index ^ 0x80);
660                         if (ret >= 0)
661                                 dev_info(&ps->dev->dev,
662                                         "%s: process %i (%s) requesting ep %02x but needs %02x\n",
663                                         __func__, task_pid_nr(current),
664                                         current->comm, index, index ^ 0x80);
665                 }
666                 if (ret >= 0)
667                         ret = checkintf(ps, ret);
668                 break;
669
670         case USB_RECIP_INTERFACE:
671                 ret = checkintf(ps, index);
672                 break;
673         }
674         return ret;
675 }
676
677 static int match_devt(struct device *dev, void *data)
678 {
679         return dev->devt == (dev_t) (unsigned long) data;
680 }
681
682 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
683 {
684         struct device *dev;
685
686         dev = bus_find_device(&usb_bus_type, NULL,
687                               (void *) (unsigned long) devt, match_devt);
688         if (!dev)
689                 return NULL;
690         return container_of(dev, struct usb_device, dev);
691 }
692
693 /*
694  * file operations
695  */
696 static int usbdev_open(struct inode *inode, struct file *file)
697 {
698         struct usb_device *dev = NULL;
699         struct dev_state *ps;
700         int ret;
701
702         ret = -ENOMEM;
703         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
704         if (!ps)
705                 goto out_free_ps;
706
707         ret = -ENODEV;
708
709         /* Protect against simultaneous removal or release */
710         mutex_lock(&usbfs_mutex);
711
712         /* usbdev device-node */
713         if (imajor(inode) == USB_DEVICE_MAJOR)
714                 dev = usbdev_lookup_by_devt(inode->i_rdev);
715
716 #ifdef CONFIG_USB_DEVICEFS
717         /* procfs file */
718         if (!dev) {
719                 dev = inode->i_private;
720                 if (dev && dev->usbfs_dentry &&
721                                         dev->usbfs_dentry->d_inode == inode)
722                         usb_get_dev(dev);
723                 else
724                         dev = NULL;
725         }
726 #endif
727         mutex_unlock(&usbfs_mutex);
728
729         if (!dev)
730                 goto out_free_ps;
731
732         usb_lock_device(dev);
733         if (dev->state == USB_STATE_NOTATTACHED)
734                 goto out_unlock_device;
735
736         ret = usb_autoresume_device(dev);
737         if (ret)
738                 goto out_unlock_device;
739
740         ps->dev = dev;
741         ps->file = file;
742         spin_lock_init(&ps->lock);
743         INIT_LIST_HEAD(&ps->list);
744         INIT_LIST_HEAD(&ps->async_pending);
745         INIT_LIST_HEAD(&ps->async_completed);
746         init_waitqueue_head(&ps->wait);
747         ps->discsignr = 0;
748         ps->disc_pid = get_pid(task_pid(current));
749         ps->cred = get_current_cred();
750         ps->disccontext = NULL;
751         ps->ifclaimed = 0;
752         security_task_getsecid(current, &ps->secid);
753         smp_wmb();
754         list_add_tail(&ps->list, &dev->filelist);
755         file->private_data = ps;
756         usb_unlock_device(dev);
757         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
758                         current->comm);
759         return ret;
760
761  out_unlock_device:
762         usb_unlock_device(dev);
763         usb_put_dev(dev);
764  out_free_ps:
765         kfree(ps);
766         return ret;
767 }
768
769 static int usbdev_release(struct inode *inode, struct file *file)
770 {
771         struct dev_state *ps = file->private_data;
772         struct usb_device *dev = ps->dev;
773         unsigned int ifnum;
774         struct async *as;
775
776         usb_lock_device(dev);
777         usb_hub_release_all_ports(dev, ps);
778
779         list_del_init(&ps->list);
780
781         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
782                         ifnum++) {
783                 if (test_bit(ifnum, &ps->ifclaimed))
784                         releaseintf(ps, ifnum);
785         }
786         destroy_all_async(ps);
787         usb_autosuspend_device(dev);
788         usb_unlock_device(dev);
789         usb_put_dev(dev);
790         put_pid(ps->disc_pid);
791         put_cred(ps->cred);
792
793         as = async_getcompleted(ps);
794         while (as) {
795                 free_async(as);
796                 as = async_getcompleted(ps);
797         }
798         kfree(ps);
799         return 0;
800 }
801
802 static int proc_control(struct dev_state *ps, void __user *arg)
803 {
804         struct usb_device *dev = ps->dev;
805         struct usbdevfs_ctrltransfer ctrl;
806         unsigned int tmo;
807         unsigned char *tbuf;
808         unsigned wLength;
809         int i, pipe, ret;
810
811         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
812                 return -EFAULT;
813         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
814                               ctrl.wIndex);
815         if (ret)
816                 return ret;
817         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
818         if (wLength > PAGE_SIZE)
819                 return -EINVAL;
820         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
821         if (!tbuf)
822                 return -ENOMEM;
823         tmo = ctrl.timeout;
824         snoop(&dev->dev, "control urb: bRequestType=%02x "
825                 "bRequest=%02x wValue=%04x "
826                 "wIndex=%04x wLength=%04x\n",
827                 ctrl.bRequestType, ctrl.bRequest,
828                 __le16_to_cpup(&ctrl.wValue),
829                 __le16_to_cpup(&ctrl.wIndex),
830                 __le16_to_cpup(&ctrl.wLength));
831         if (ctrl.bRequestType & 0x80) {
832                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
833                                                ctrl.wLength)) {
834                         free_page((unsigned long)tbuf);
835                         return -EINVAL;
836                 }
837                 pipe = usb_rcvctrlpipe(dev, 0);
838                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
839
840                 usb_unlock_device(dev);
841                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
842                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
843                                     tbuf, ctrl.wLength, tmo);
844                 usb_lock_device(dev);
845                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
846                           tbuf, max(i, 0));
847                 if ((i > 0) && ctrl.wLength) {
848                         if (copy_to_user(ctrl.data, tbuf, i)) {
849                                 free_page((unsigned long)tbuf);
850                                 return -EFAULT;
851                         }
852                 }
853         } else {
854                 if (ctrl.wLength) {
855                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
856                                 free_page((unsigned long)tbuf);
857                                 return -EFAULT;
858                         }
859                 }
860                 pipe = usb_sndctrlpipe(dev, 0);
861                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
862                         tbuf, ctrl.wLength);
863
864                 usb_unlock_device(dev);
865                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
866                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
867                                     tbuf, ctrl.wLength, tmo);
868                 usb_lock_device(dev);
869                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
870         }
871         free_page((unsigned long)tbuf);
872         if (i < 0 && i != -EPIPE) {
873                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
874                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
875                            current->comm, ctrl.bRequestType, ctrl.bRequest,
876                            ctrl.wLength, i);
877         }
878         return i;
879 }
880
881 static int proc_bulk(struct dev_state *ps, void __user *arg)
882 {
883         struct usb_device *dev = ps->dev;
884         struct usbdevfs_bulktransfer bulk;
885         unsigned int tmo, len1, pipe;
886         int len2;
887         unsigned char *tbuf;
888         int i, ret;
889
890         if (copy_from_user(&bulk, arg, sizeof(bulk)))
891                 return -EFAULT;
892         ret = findintfep(ps->dev, bulk.ep);
893         if (ret < 0)
894                 return ret;
895         ret = checkintf(ps, ret);
896         if (ret)
897                 return ret;
898         if (bulk.ep & USB_DIR_IN)
899                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
900         else
901                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
902         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
903                 return -EINVAL;
904         len1 = bulk.len;
905         if (len1 > MAX_USBFS_BUFFER_SIZE)
906                 return -EINVAL;
907         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
908                 return -ENOMEM;
909         tmo = bulk.timeout;
910         if (bulk.ep & 0x80) {
911                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
912                         kfree(tbuf);
913                         return -EINVAL;
914                 }
915                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
916
917                 usb_unlock_device(dev);
918                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
919                 usb_lock_device(dev);
920                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
921
922                 if (!i && len2) {
923                         if (copy_to_user(bulk.data, tbuf, len2)) {
924                                 kfree(tbuf);
925                                 return -EFAULT;
926                         }
927                 }
928         } else {
929                 if (len1) {
930                         if (copy_from_user(tbuf, bulk.data, len1)) {
931                                 kfree(tbuf);
932                                 return -EFAULT;
933                         }
934                 }
935                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
936
937                 usb_unlock_device(dev);
938                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
939                 usb_lock_device(dev);
940                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
941         }
942         kfree(tbuf);
943         if (i < 0)
944                 return i;
945         return len2;
946 }
947
948 static int proc_resetep(struct dev_state *ps, void __user *arg)
949 {
950         unsigned int ep;
951         int ret;
952
953         if (get_user(ep, (unsigned int __user *)arg))
954                 return -EFAULT;
955         ret = findintfep(ps->dev, ep);
956         if (ret < 0)
957                 return ret;
958         ret = checkintf(ps, ret);
959         if (ret)
960                 return ret;
961         usb_reset_endpoint(ps->dev, ep);
962         return 0;
963 }
964
965 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
966 {
967         unsigned int ep;
968         int pipe;
969         int ret;
970
971         if (get_user(ep, (unsigned int __user *)arg))
972                 return -EFAULT;
973         ret = findintfep(ps->dev, ep);
974         if (ret < 0)
975                 return ret;
976         ret = checkintf(ps, ret);
977         if (ret)
978                 return ret;
979         if (ep & USB_DIR_IN)
980                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
981         else
982                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
983
984         return usb_clear_halt(ps->dev, pipe);
985 }
986
987 static int proc_getdriver(struct dev_state *ps, void __user *arg)
988 {
989         struct usbdevfs_getdriver gd;
990         struct usb_interface *intf;
991         int ret;
992
993         if (copy_from_user(&gd, arg, sizeof(gd)))
994                 return -EFAULT;
995         intf = usb_ifnum_to_if(ps->dev, gd.interface);
996         if (!intf || !intf->dev.driver)
997                 ret = -ENODATA;
998         else {
999                 strncpy(gd.driver, intf->dev.driver->name,
1000                                 sizeof(gd.driver));
1001                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1002         }
1003         return ret;
1004 }
1005
1006 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
1007 {
1008         struct usbdevfs_connectinfo ci;
1009
1010         memset(&ci, 0, sizeof(ci));
1011         ci.devnum = ps->dev->devnum;
1012         ci.slow = ps->dev->speed == USB_SPEED_LOW;
1013
1014         if (copy_to_user(arg, &ci, sizeof(ci)))
1015                 return -EFAULT;
1016         return 0;
1017 }
1018
1019 static int proc_resetdevice(struct dev_state *ps)
1020 {
1021         return usb_reset_device(ps->dev);
1022 }
1023
1024 static int proc_setintf(struct dev_state *ps, void __user *arg)
1025 {
1026         struct usbdevfs_setinterface setintf;
1027         int ret;
1028
1029         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1030                 return -EFAULT;
1031         if ((ret = checkintf(ps, setintf.interface)))
1032                 return ret;
1033         return usb_set_interface(ps->dev, setintf.interface,
1034                         setintf.altsetting);
1035 }
1036
1037 static int proc_setconfig(struct dev_state *ps, void __user *arg)
1038 {
1039         int u;
1040         int status = 0;
1041         struct usb_host_config *actconfig;
1042
1043         if (get_user(u, (int __user *)arg))
1044                 return -EFAULT;
1045
1046         actconfig = ps->dev->actconfig;
1047
1048         /* Don't touch the device if any interfaces are claimed.
1049          * It could interfere with other drivers' operations, and if
1050          * an interface is claimed by usbfs it could easily deadlock.
1051          */
1052         if (actconfig) {
1053                 int i;
1054
1055                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1056                         if (usb_interface_claimed(actconfig->interface[i])) {
1057                                 dev_warn(&ps->dev->dev,
1058                                         "usbfs: interface %d claimed by %s "
1059                                         "while '%s' sets config #%d\n",
1060                                         actconfig->interface[i]
1061                                                 ->cur_altsetting
1062                                                 ->desc.bInterfaceNumber,
1063                                         actconfig->interface[i]
1064                                                 ->dev.driver->name,
1065                                         current->comm, u);
1066                                 status = -EBUSY;
1067                                 break;
1068                         }
1069                 }
1070         }
1071
1072         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1073          * so avoid usb_set_configuration()'s kick to sysfs
1074          */
1075         if (status == 0) {
1076                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1077                         status = usb_reset_configuration(ps->dev);
1078                 else
1079                         status = usb_set_configuration(ps->dev, u);
1080         }
1081
1082         return status;
1083 }
1084
1085 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1086                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1087                         void __user *arg)
1088 {
1089         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1090         struct usb_host_endpoint *ep;
1091         struct async *as;
1092         struct usb_ctrlrequest *dr = NULL;
1093         unsigned int u, totlen, isofrmlen;
1094         int ret, ifnum = -1;
1095         int is_in;
1096
1097         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1098                                 USBDEVFS_URB_SHORT_NOT_OK |
1099                                 USBDEVFS_URB_BULK_CONTINUATION |
1100                                 USBDEVFS_URB_NO_FSBR |
1101                                 USBDEVFS_URB_ZERO_PACKET |
1102                                 USBDEVFS_URB_NO_INTERRUPT))
1103                 return -EINVAL;
1104         if (uurb->buffer_length > 0 && !uurb->buffer)
1105                 return -EINVAL;
1106         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1107             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1108                 ifnum = findintfep(ps->dev, uurb->endpoint);
1109                 if (ifnum < 0)
1110                         return ifnum;
1111                 ret = checkintf(ps, ifnum);
1112                 if (ret)
1113                         return ret;
1114         }
1115         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1116                 is_in = 1;
1117                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1118         } else {
1119                 is_in = 0;
1120                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1121         }
1122         if (!ep)
1123                 return -ENOENT;
1124         switch(uurb->type) {
1125         case USBDEVFS_URB_TYPE_CONTROL:
1126                 if (!usb_endpoint_xfer_control(&ep->desc))
1127                         return -EINVAL;
1128                 /* min 8 byte setup packet,
1129                  * max 8 byte setup plus an arbitrary data stage */
1130                 if (uurb->buffer_length < 8 ||
1131                     uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1132                         return -EINVAL;
1133                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1134                 if (!dr)
1135                         return -ENOMEM;
1136                 if (copy_from_user(dr, uurb->buffer, 8)) {
1137                         kfree(dr);
1138                         return -EFAULT;
1139                 }
1140                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1141                         kfree(dr);
1142                         return -EINVAL;
1143                 }
1144                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1145                                       le16_to_cpup(&dr->wIndex));
1146                 if (ret) {
1147                         kfree(dr);
1148                         return ret;
1149                 }
1150                 uurb->number_of_packets = 0;
1151                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1152                 uurb->buffer += 8;
1153                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1154                         is_in = 1;
1155                         uurb->endpoint |= USB_DIR_IN;
1156                 } else {
1157                         is_in = 0;
1158                         uurb->endpoint &= ~USB_DIR_IN;
1159                 }
1160                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1161                         "bRequest=%02x wValue=%04x "
1162                         "wIndex=%04x wLength=%04x\n",
1163                         dr->bRequestType, dr->bRequest,
1164                         __le16_to_cpup(&dr->wValue),
1165                         __le16_to_cpup(&dr->wIndex),
1166                         __le16_to_cpup(&dr->wLength));
1167                 break;
1168
1169         case USBDEVFS_URB_TYPE_BULK:
1170                 switch (usb_endpoint_type(&ep->desc)) {
1171                 case USB_ENDPOINT_XFER_CONTROL:
1172                 case USB_ENDPOINT_XFER_ISOC:
1173                         return -EINVAL;
1174                 case USB_ENDPOINT_XFER_INT:
1175                         /* allow single-shot interrupt transfers */
1176                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1177                         goto interrupt_urb;
1178                 }
1179                 uurb->number_of_packets = 0;
1180                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1181                         return -EINVAL;
1182                 break;
1183
1184         case USBDEVFS_URB_TYPE_INTERRUPT:
1185                 if (!usb_endpoint_xfer_int(&ep->desc))
1186                         return -EINVAL;
1187  interrupt_urb:
1188                 uurb->number_of_packets = 0;
1189                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1190                         return -EINVAL;
1191                 break;
1192
1193         case USBDEVFS_URB_TYPE_ISO:
1194                 /* arbitrary limit */
1195                 if (uurb->number_of_packets < 1 ||
1196                     uurb->number_of_packets > 128)
1197                         return -EINVAL;
1198                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1199                         return -EINVAL;
1200                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1201                                    uurb->number_of_packets;
1202                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1203                         return -ENOMEM;
1204                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1205                         kfree(isopkt);
1206                         return -EFAULT;
1207                 }
1208                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1209                         /* arbitrary limit,
1210                          * sufficient for USB 2.0 high-bandwidth iso */
1211                         if (isopkt[u].length > 8192) {
1212                                 kfree(isopkt);
1213                                 return -EINVAL;
1214                         }
1215                         totlen += isopkt[u].length;
1216                 }
1217                 /* 3072 * 64 microframes */
1218                 if (totlen > 196608) {
1219                         kfree(isopkt);
1220                         return -EINVAL;
1221                 }
1222                 uurb->buffer_length = totlen;
1223                 break;
1224
1225         default:
1226                 return -EINVAL;
1227         }
1228         if (uurb->buffer_length > 0 &&
1229                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1230                                 uurb->buffer, uurb->buffer_length)) {
1231                 kfree(isopkt);
1232                 kfree(dr);
1233                 return -EFAULT;
1234         }
1235         as = alloc_async(uurb->number_of_packets);
1236         if (!as) {
1237                 kfree(isopkt);
1238                 kfree(dr);
1239                 return -ENOMEM;
1240         }
1241         if (uurb->buffer_length > 0) {
1242                 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1243                                 GFP_KERNEL);
1244                 if (!as->urb->transfer_buffer) {
1245                         kfree(isopkt);
1246                         kfree(dr);
1247                         free_async(as);
1248                         return -ENOMEM;
1249                 }
1250                 /* Isochronous input data may end up being discontiguous
1251                  * if some of the packets are short.  Clear the buffer so
1252                  * that the gaps don't leak kernel data to userspace.
1253                  */
1254                 if (is_in && uurb->type == USBDEVFS_URB_TYPE_ISO)
1255                         memset(as->urb->transfer_buffer, 0,
1256                                         uurb->buffer_length);
1257         }
1258         as->urb->dev = ps->dev;
1259         as->urb->pipe = (uurb->type << 30) |
1260                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1261                         (uurb->endpoint & USB_DIR_IN);
1262
1263         /* This tedious sequence is necessary because the URB_* flags
1264          * are internal to the kernel and subject to change, whereas
1265          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1266          */
1267         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1268         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1269                 u |= URB_ISO_ASAP;
1270         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1271                 u |= URB_SHORT_NOT_OK;
1272         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1273                 u |= URB_NO_FSBR;
1274         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1275                 u |= URB_ZERO_PACKET;
1276         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1277                 u |= URB_NO_INTERRUPT;
1278         as->urb->transfer_flags = u;
1279
1280         as->urb->transfer_buffer_length = uurb->buffer_length;
1281         as->urb->setup_packet = (unsigned char *)dr;
1282         as->urb->start_frame = uurb->start_frame;
1283         as->urb->number_of_packets = uurb->number_of_packets;
1284         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1285                         ps->dev->speed == USB_SPEED_HIGH)
1286                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1287         else
1288                 as->urb->interval = ep->desc.bInterval;
1289         as->urb->context = as;
1290         as->urb->complete = async_completed;
1291         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1292                 as->urb->iso_frame_desc[u].offset = totlen;
1293                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1294                 totlen += isopkt[u].length;
1295         }
1296         kfree(isopkt);
1297         as->ps = ps;
1298         as->userurb = arg;
1299         if (is_in && uurb->buffer_length > 0)
1300                 as->userbuffer = uurb->buffer;
1301         else
1302                 as->userbuffer = NULL;
1303         as->signr = uurb->signr;
1304         as->ifnum = ifnum;
1305         as->pid = get_pid(task_pid(current));
1306         as->cred = get_current_cred();
1307         security_task_getsecid(current, &as->secid);
1308         if (!is_in && uurb->buffer_length > 0) {
1309                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1310                                 uurb->buffer_length)) {
1311                         free_async(as);
1312                         return -EFAULT;
1313                 }
1314         }
1315         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1316                         as->urb->transfer_buffer_length, 0, SUBMIT,
1317                         is_in ? NULL : as->urb->transfer_buffer,
1318                                 uurb->buffer_length);
1319         async_newpending(as);
1320
1321         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1322                 spin_lock_irq(&ps->lock);
1323
1324                 /* Not exactly the endpoint address; the direction bit is
1325                  * shifted to the 0x10 position so that the value will be
1326                  * between 0 and 31.
1327                  */
1328                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1329                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1330                                 >> 3);
1331
1332                 /* If this bulk URB is the start of a new transfer, re-enable
1333                  * the endpoint.  Otherwise mark it as a continuation URB.
1334                  */
1335                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1336                         as->bulk_status = AS_CONTINUATION;
1337                 else
1338                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1339
1340                 /* Don't accept continuation URBs if the endpoint is
1341                  * disabled because of an earlier error.
1342                  */
1343                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1344                         ret = -EREMOTEIO;
1345                 else
1346                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1347                 spin_unlock_irq(&ps->lock);
1348         } else {
1349                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1350         }
1351
1352         if (ret) {
1353                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1354                            "usbfs: usb_submit_urb returned %d\n", ret);
1355                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1356                                 0, ret, COMPLETE, NULL, 0);
1357                 async_removepending(as);
1358                 free_async(as);
1359                 return ret;
1360         }
1361         return 0;
1362 }
1363
1364 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1365 {
1366         struct usbdevfs_urb uurb;
1367
1368         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1369                 return -EFAULT;
1370
1371         return proc_do_submiturb(ps, &uurb,
1372                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1373                         arg);
1374 }
1375
1376 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1377 {
1378         struct urb *urb;
1379         struct async *as;
1380         unsigned long flags;
1381
1382         spin_lock_irqsave(&ps->lock, flags);
1383         as = async_getpending(ps, arg);
1384         if (!as) {
1385                 spin_unlock_irqrestore(&ps->lock, flags);
1386                 return -EINVAL;
1387         }
1388
1389         urb = as->urb;
1390         usb_get_urb(urb);
1391         spin_unlock_irqrestore(&ps->lock, flags);
1392
1393         usb_kill_urb(urb);
1394         usb_put_urb(urb);
1395
1396         return 0;
1397 }
1398
1399 static int processcompl(struct async *as, void __user * __user *arg)
1400 {
1401         struct urb *urb = as->urb;
1402         struct usbdevfs_urb __user *userurb = as->userurb;
1403         void __user *addr = as->userurb;
1404         unsigned int i;
1405
1406         if (as->userbuffer && urb->actual_length) {
1407                 if (urb->number_of_packets > 0)         /* Isochronous */
1408                         i = urb->transfer_buffer_length;
1409                 else                                    /* Non-Isoc */
1410                         i = urb->actual_length;
1411                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, i))
1412                         goto err_out;
1413         }
1414         if (put_user(as->status, &userurb->status))
1415                 goto err_out;
1416         if (put_user(urb->actual_length, &userurb->actual_length))
1417                 goto err_out;
1418         if (put_user(urb->error_count, &userurb->error_count))
1419                 goto err_out;
1420
1421         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1422                 for (i = 0; i < urb->number_of_packets; i++) {
1423                         if (put_user(urb->iso_frame_desc[i].actual_length,
1424                                      &userurb->iso_frame_desc[i].actual_length))
1425                                 goto err_out;
1426                         if (put_user(urb->iso_frame_desc[i].status,
1427                                      &userurb->iso_frame_desc[i].status))
1428                                 goto err_out;
1429                 }
1430         }
1431
1432         if (put_user(addr, (void __user * __user *)arg))
1433                 return -EFAULT;
1434         return 0;
1435
1436 err_out:
1437         return -EFAULT;
1438 }
1439
1440 static struct async *reap_as(struct dev_state *ps)
1441 {
1442         DECLARE_WAITQUEUE(wait, current);
1443         struct async *as = NULL;
1444         struct usb_device *dev = ps->dev;
1445
1446         add_wait_queue(&ps->wait, &wait);
1447         for (;;) {
1448                 __set_current_state(TASK_INTERRUPTIBLE);
1449                 as = async_getcompleted(ps);
1450                 if (as)
1451                         break;
1452                 if (signal_pending(current))
1453                         break;
1454                 usb_unlock_device(dev);
1455                 schedule();
1456                 usb_lock_device(dev);
1457         }
1458         remove_wait_queue(&ps->wait, &wait);
1459         set_current_state(TASK_RUNNING);
1460         return as;
1461 }
1462
1463 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1464 {
1465         struct async *as = reap_as(ps);
1466         if (as) {
1467                 int retval = processcompl(as, (void __user * __user *)arg);
1468                 free_async(as);
1469                 return retval;
1470         }
1471         if (signal_pending(current))
1472                 return -EINTR;
1473         return -EIO;
1474 }
1475
1476 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1477 {
1478         int retval;
1479         struct async *as;
1480
1481         as = async_getcompleted(ps);
1482         retval = -EAGAIN;
1483         if (as) {
1484                 retval = processcompl(as, (void __user * __user *)arg);
1485                 free_async(as);
1486         }
1487         return retval;
1488 }
1489
1490 #ifdef CONFIG_COMPAT
1491 static int proc_control_compat(struct dev_state *ps,
1492                                 struct usbdevfs_ctrltransfer32 __user *p32)
1493 {
1494         struct usbdevfs_ctrltransfer __user *p;
1495         __u32 udata;
1496         p = compat_alloc_user_space(sizeof(*p));
1497         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1498             get_user(udata, &p32->data) ||
1499             put_user(compat_ptr(udata), &p->data))
1500                 return -EFAULT;
1501         return proc_control(ps, p);
1502 }
1503
1504 static int proc_bulk_compat(struct dev_state *ps,
1505                         struct usbdevfs_bulktransfer32 __user *p32)
1506 {
1507         struct usbdevfs_bulktransfer __user *p;
1508         compat_uint_t n;
1509         compat_caddr_t addr;
1510
1511         p = compat_alloc_user_space(sizeof(*p));
1512
1513         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1514             get_user(n, &p32->len) || put_user(n, &p->len) ||
1515             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1516             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1517                 return -EFAULT;
1518
1519         return proc_bulk(ps, p);
1520 }
1521 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1522 {
1523         struct usbdevfs_disconnectsignal32 ds;
1524
1525         if (copy_from_user(&ds, arg, sizeof(ds)))
1526                 return -EFAULT;
1527         ps->discsignr = ds.signr;
1528         ps->disccontext = compat_ptr(ds.context);
1529         return 0;
1530 }
1531
1532 static int get_urb32(struct usbdevfs_urb *kurb,
1533                      struct usbdevfs_urb32 __user *uurb)
1534 {
1535         __u32  uptr;
1536         if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1537             __get_user(kurb->type, &uurb->type) ||
1538             __get_user(kurb->endpoint, &uurb->endpoint) ||
1539             __get_user(kurb->status, &uurb->status) ||
1540             __get_user(kurb->flags, &uurb->flags) ||
1541             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1542             __get_user(kurb->actual_length, &uurb->actual_length) ||
1543             __get_user(kurb->start_frame, &uurb->start_frame) ||
1544             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1545             __get_user(kurb->error_count, &uurb->error_count) ||
1546             __get_user(kurb->signr, &uurb->signr))
1547                 return -EFAULT;
1548
1549         if (__get_user(uptr, &uurb->buffer))
1550                 return -EFAULT;
1551         kurb->buffer = compat_ptr(uptr);
1552         if (__get_user(uptr, &uurb->usercontext))
1553                 return -EFAULT;
1554         kurb->usercontext = compat_ptr(uptr);
1555
1556         return 0;
1557 }
1558
1559 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1560 {
1561         struct usbdevfs_urb uurb;
1562
1563         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1564                 return -EFAULT;
1565
1566         return proc_do_submiturb(ps, &uurb,
1567                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1568                         arg);
1569 }
1570
1571 static int processcompl_compat(struct async *as, void __user * __user *arg)
1572 {
1573         struct urb *urb = as->urb;
1574         struct usbdevfs_urb32 __user *userurb = as->userurb;
1575         void __user *addr = as->userurb;
1576         unsigned int i;
1577
1578         if (as->userbuffer && urb->actual_length) {
1579                 if (urb->number_of_packets > 0)         /* Isochronous */
1580                         i = urb->transfer_buffer_length;
1581                 else                                    /* Non-Isoc */
1582                         i = urb->actual_length;
1583                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, i))
1584                         return -EFAULT;
1585         }
1586         if (put_user(as->status, &userurb->status))
1587                 return -EFAULT;
1588         if (put_user(urb->actual_length, &userurb->actual_length))
1589                 return -EFAULT;
1590         if (put_user(urb->error_count, &userurb->error_count))
1591                 return -EFAULT;
1592
1593         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1594                 for (i = 0; i < urb->number_of_packets; i++) {
1595                         if (put_user(urb->iso_frame_desc[i].actual_length,
1596                                      &userurb->iso_frame_desc[i].actual_length))
1597                                 return -EFAULT;
1598                         if (put_user(urb->iso_frame_desc[i].status,
1599                                      &userurb->iso_frame_desc[i].status))
1600                                 return -EFAULT;
1601                 }
1602         }
1603
1604         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1605                 return -EFAULT;
1606         return 0;
1607 }
1608
1609 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1610 {
1611         struct async *as = reap_as(ps);
1612         if (as) {
1613                 int retval = processcompl_compat(as, (void __user * __user *)arg);
1614                 free_async(as);
1615                 return retval;
1616         }
1617         if (signal_pending(current))
1618                 return -EINTR;
1619         return -EIO;
1620 }
1621
1622 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1623 {
1624         int retval;
1625         struct async *as;
1626
1627         retval = -EAGAIN;
1628         as = async_getcompleted(ps);
1629         if (as) {
1630                 retval = processcompl_compat(as, (void __user * __user *)arg);
1631                 free_async(as);
1632         }
1633         return retval;
1634 }
1635
1636
1637 #endif
1638
1639 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1640 {
1641         struct usbdevfs_disconnectsignal ds;
1642
1643         if (copy_from_user(&ds, arg, sizeof(ds)))
1644                 return -EFAULT;
1645         ps->discsignr = ds.signr;
1646         ps->disccontext = ds.context;
1647         return 0;
1648 }
1649
1650 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1651 {
1652         unsigned int ifnum;
1653
1654         if (get_user(ifnum, (unsigned int __user *)arg))
1655                 return -EFAULT;
1656         return claimintf(ps, ifnum);
1657 }
1658
1659 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1660 {
1661         unsigned int ifnum;
1662         int ret;
1663
1664         if (get_user(ifnum, (unsigned int __user *)arg))
1665                 return -EFAULT;
1666         if ((ret = releaseintf(ps, ifnum)) < 0)
1667                 return ret;
1668         destroy_async_on_interface (ps, ifnum);
1669         return 0;
1670 }
1671
1672 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1673 {
1674         int                     size;
1675         void                    *buf = NULL;
1676         int                     retval = 0;
1677         struct usb_interface    *intf = NULL;
1678         struct usb_driver       *driver = NULL;
1679
1680         /* alloc buffer */
1681         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1682                 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1683                         return -ENOMEM;
1684                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1685                         if (copy_from_user(buf, ctl->data, size)) {
1686                                 kfree(buf);
1687                                 return -EFAULT;
1688                         }
1689                 } else {
1690                         memset(buf, 0, size);
1691                 }
1692         }
1693
1694         if (!connected(ps)) {
1695                 kfree(buf);
1696                 return -ENODEV;
1697         }
1698
1699         if (ps->dev->state != USB_STATE_CONFIGURED)
1700                 retval = -EHOSTUNREACH;
1701         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1702                 retval = -EINVAL;
1703         else switch (ctl->ioctl_code) {
1704
1705         /* disconnect kernel driver from interface */
1706         case USBDEVFS_DISCONNECT:
1707                 if (intf->dev.driver) {
1708                         driver = to_usb_driver(intf->dev.driver);
1709                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1710                         usb_driver_release_interface(driver, intf);
1711                 } else
1712                         retval = -ENODATA;
1713                 break;
1714
1715         /* let kernel drivers try to (re)bind to the interface */
1716         case USBDEVFS_CONNECT:
1717                 if (!intf->dev.driver)
1718                         retval = device_attach(&intf->dev);
1719                 else
1720                         retval = -EBUSY;
1721                 break;
1722
1723         /* talk directly to the interface's driver */
1724         default:
1725                 if (intf->dev.driver)
1726                         driver = to_usb_driver(intf->dev.driver);
1727                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1728                         retval = -ENOTTY;
1729                 } else {
1730                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1731                         if (retval == -ENOIOCTLCMD)
1732                                 retval = -ENOTTY;
1733                 }
1734         }
1735
1736         /* cleanup and return */
1737         if (retval >= 0
1738                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1739                         && size > 0
1740                         && copy_to_user(ctl->data, buf, size) != 0)
1741                 retval = -EFAULT;
1742
1743         kfree(buf);
1744         return retval;
1745 }
1746
1747 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1748 {
1749         struct usbdevfs_ioctl   ctrl;
1750
1751         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1752                 return -EFAULT;
1753         return proc_ioctl(ps, &ctrl);
1754 }
1755
1756 #ifdef CONFIG_COMPAT
1757 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1758 {
1759         struct usbdevfs_ioctl32 __user *uioc;
1760         struct usbdevfs_ioctl ctrl;
1761         u32 udata;
1762
1763         uioc = compat_ptr((long)arg);
1764         if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1765             __get_user(ctrl.ifno, &uioc->ifno) ||
1766             __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1767             __get_user(udata, &uioc->data))
1768                 return -EFAULT;
1769         ctrl.data = compat_ptr(udata);
1770
1771         return proc_ioctl(ps, &ctrl);
1772 }
1773 #endif
1774
1775 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1776 {
1777         unsigned portnum;
1778         int rc;
1779
1780         if (get_user(portnum, (unsigned __user *) arg))
1781                 return -EFAULT;
1782         rc = usb_hub_claim_port(ps->dev, portnum, ps);
1783         if (rc == 0)
1784                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1785                         portnum, task_pid_nr(current), current->comm);
1786         return rc;
1787 }
1788
1789 static int proc_release_port(struct dev_state *ps, void __user *arg)
1790 {
1791         unsigned portnum;
1792
1793         if (get_user(portnum, (unsigned __user *) arg))
1794                 return -EFAULT;
1795         return usb_hub_release_port(ps->dev, portnum, ps);
1796 }
1797
1798 /*
1799  * NOTE:  All requests here that have interface numbers as parameters
1800  * are assuming that somehow the configuration has been prevented from
1801  * changing.  But there's no mechanism to ensure that...
1802  */
1803 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1804                                 void __user *p)
1805 {
1806         struct dev_state *ps = file->private_data;
1807         struct inode *inode = file->f_path.dentry->d_inode;
1808         struct usb_device *dev = ps->dev;
1809         int ret = -ENOTTY;
1810
1811         if (!(file->f_mode & FMODE_WRITE))
1812                 return -EPERM;
1813
1814         usb_lock_device(dev);
1815         if (!connected(ps)) {
1816                 usb_unlock_device(dev);
1817                 return -ENODEV;
1818         }
1819
1820         switch (cmd) {
1821         case USBDEVFS_CONTROL:
1822                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1823                 ret = proc_control(ps, p);
1824                 if (ret >= 0)
1825                         inode->i_mtime = CURRENT_TIME;
1826                 break;
1827
1828         case USBDEVFS_BULK:
1829                 snoop(&dev->dev, "%s: BULK\n", __func__);
1830                 ret = proc_bulk(ps, p);
1831                 if (ret >= 0)
1832                         inode->i_mtime = CURRENT_TIME;
1833                 break;
1834
1835         case USBDEVFS_RESETEP:
1836                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1837                 ret = proc_resetep(ps, p);
1838                 if (ret >= 0)
1839                         inode->i_mtime = CURRENT_TIME;
1840                 break;
1841
1842         case USBDEVFS_RESET:
1843                 snoop(&dev->dev, "%s: RESET\n", __func__);
1844                 ret = proc_resetdevice(ps);
1845                 break;
1846
1847         case USBDEVFS_CLEAR_HALT:
1848                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1849                 ret = proc_clearhalt(ps, p);
1850                 if (ret >= 0)
1851                         inode->i_mtime = CURRENT_TIME;
1852                 break;
1853
1854         case USBDEVFS_GETDRIVER:
1855                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1856                 ret = proc_getdriver(ps, p);
1857                 break;
1858
1859         case USBDEVFS_CONNECTINFO:
1860                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1861                 ret = proc_connectinfo(ps, p);
1862                 break;
1863
1864         case USBDEVFS_SETINTERFACE:
1865                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1866                 ret = proc_setintf(ps, p);
1867                 break;
1868
1869         case USBDEVFS_SETCONFIGURATION:
1870                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1871                 ret = proc_setconfig(ps, p);
1872                 break;
1873
1874         case USBDEVFS_SUBMITURB:
1875                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1876                 ret = proc_submiturb(ps, p);
1877                 if (ret >= 0)
1878                         inode->i_mtime = CURRENT_TIME;
1879                 break;
1880
1881 #ifdef CONFIG_COMPAT
1882         case USBDEVFS_CONTROL32:
1883                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
1884                 ret = proc_control_compat(ps, p);
1885                 if (ret >= 0)
1886                         inode->i_mtime = CURRENT_TIME;
1887                 break;
1888
1889         case USBDEVFS_BULK32:
1890                 snoop(&dev->dev, "%s: BULK32\n", __func__);
1891                 ret = proc_bulk_compat(ps, p);
1892                 if (ret >= 0)
1893                         inode->i_mtime = CURRENT_TIME;
1894                 break;
1895
1896         case USBDEVFS_DISCSIGNAL32:
1897                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
1898                 ret = proc_disconnectsignal_compat(ps, p);
1899                 break;
1900
1901         case USBDEVFS_SUBMITURB32:
1902                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1903                 ret = proc_submiturb_compat(ps, p);
1904                 if (ret >= 0)
1905                         inode->i_mtime = CURRENT_TIME;
1906                 break;
1907
1908         case USBDEVFS_REAPURB32:
1909                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1910                 ret = proc_reapurb_compat(ps, p);
1911                 break;
1912
1913         case USBDEVFS_REAPURBNDELAY32:
1914                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
1915                 ret = proc_reapurbnonblock_compat(ps, p);
1916                 break;
1917
1918         case USBDEVFS_IOCTL32:
1919                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
1920                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1921                 break;
1922 #endif
1923
1924         case USBDEVFS_DISCARDURB:
1925                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1926                 ret = proc_unlinkurb(ps, p);
1927                 break;
1928
1929         case USBDEVFS_REAPURB:
1930                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1931                 ret = proc_reapurb(ps, p);
1932                 break;
1933
1934         case USBDEVFS_REAPURBNDELAY:
1935                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
1936                 ret = proc_reapurbnonblock(ps, p);
1937                 break;
1938
1939         case USBDEVFS_DISCSIGNAL:
1940                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1941                 ret = proc_disconnectsignal(ps, p);
1942                 break;
1943
1944         case USBDEVFS_CLAIMINTERFACE:
1945                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1946                 ret = proc_claiminterface(ps, p);
1947                 break;
1948
1949         case USBDEVFS_RELEASEINTERFACE:
1950                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1951                 ret = proc_releaseinterface(ps, p);
1952                 break;
1953
1954         case USBDEVFS_IOCTL:
1955                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1956                 ret = proc_ioctl_default(ps, p);
1957                 break;
1958
1959         case USBDEVFS_CLAIM_PORT:
1960                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
1961                 ret = proc_claim_port(ps, p);
1962                 break;
1963
1964         case USBDEVFS_RELEASE_PORT:
1965                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
1966                 ret = proc_release_port(ps, p);
1967                 break;
1968         }
1969         usb_unlock_device(dev);
1970         if (ret >= 0)
1971                 inode->i_atime = CURRENT_TIME;
1972         return ret;
1973 }
1974
1975 static long usbdev_ioctl(struct file *file, unsigned int cmd,
1976                         unsigned long arg)
1977 {
1978         int ret;
1979
1980         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
1981
1982         return ret;
1983 }
1984
1985 #ifdef CONFIG_COMPAT
1986 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
1987                         unsigned long arg)
1988 {
1989         int ret;
1990
1991         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
1992
1993         return ret;
1994 }
1995 #endif
1996
1997 /* No kernel lock - fine */
1998 static unsigned int usbdev_poll(struct file *file,
1999                                 struct poll_table_struct *wait)
2000 {
2001         struct dev_state *ps = file->private_data;
2002         unsigned int mask = 0;
2003
2004         poll_wait(file, &ps->wait, wait);
2005         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2006                 mask |= POLLOUT | POLLWRNORM;
2007         if (!connected(ps))
2008                 mask |= POLLERR | POLLHUP;
2009         return mask;
2010 }
2011
2012 const struct file_operations usbdev_file_operations = {
2013         .owner =          THIS_MODULE,
2014         .llseek =         usbdev_lseek,
2015         .read =           usbdev_read,
2016         .poll =           usbdev_poll,
2017         .unlocked_ioctl = usbdev_ioctl,
2018 #ifdef CONFIG_COMPAT
2019         .compat_ioctl =   usbdev_compat_ioctl,
2020 #endif
2021         .open =           usbdev_open,
2022         .release =        usbdev_release,
2023 };
2024
2025 static void usbdev_remove(struct usb_device *udev)
2026 {
2027         struct dev_state *ps;
2028         struct siginfo sinfo;
2029
2030         while (!list_empty(&udev->filelist)) {
2031                 ps = list_entry(udev->filelist.next, struct dev_state, list);
2032                 destroy_all_async(ps);
2033                 wake_up_all(&ps->wait);
2034                 list_del_init(&ps->list);
2035                 if (ps->discsignr) {
2036                         memset(&sinfo, 0, sizeof(sinfo));
2037                         sinfo.si_signo = ps->discsignr;
2038                         sinfo.si_errno = EPIPE;
2039                         sinfo.si_code = SI_ASYNCIO;
2040                         sinfo.si_addr = ps->disccontext;
2041                         kill_pid_info_as_cred(ps->discsignr, &sinfo,
2042                                         ps->disc_pid, ps->cred, ps->secid);
2043                 }
2044         }
2045 }
2046
2047 #ifdef CONFIG_USB_DEVICE_CLASS
2048 static struct class *usb_classdev_class;
2049
2050 static int usb_classdev_add(struct usb_device *dev)
2051 {
2052         struct device *cldev;
2053
2054         cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
2055                               NULL, "usbdev%d.%d", dev->bus->busnum,
2056                               dev->devnum);
2057         if (IS_ERR(cldev))
2058                 return PTR_ERR(cldev);
2059         dev->usb_classdev = cldev;
2060         return 0;
2061 }
2062
2063 static void usb_classdev_remove(struct usb_device *dev)
2064 {
2065         if (dev->usb_classdev)
2066                 device_unregister(dev->usb_classdev);
2067 }
2068
2069 #else
2070 #define usb_classdev_add(dev)           0
2071 #define usb_classdev_remove(dev)        do {} while (0)
2072
2073 #endif
2074
2075 static int usbdev_notify(struct notifier_block *self,
2076                                unsigned long action, void *dev)
2077 {
2078         switch (action) {
2079         case USB_DEVICE_ADD:
2080                 if (usb_classdev_add(dev))
2081                         return NOTIFY_BAD;
2082                 break;
2083         case USB_DEVICE_REMOVE:
2084                 usb_classdev_remove(dev);
2085                 usbdev_remove(dev);
2086                 break;
2087         }
2088         return NOTIFY_OK;
2089 }
2090
2091 static struct notifier_block usbdev_nb = {
2092         .notifier_call =        usbdev_notify,
2093 };
2094
2095 static struct cdev usb_device_cdev;
2096
2097 int __init usb_devio_init(void)
2098 {
2099         int retval;
2100
2101         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2102                                         "usb_device");
2103         if (retval) {
2104                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2105                 goto out;
2106         }
2107         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2108         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2109         if (retval) {
2110                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2111                        USB_DEVICE_MAJOR);
2112                 goto error_cdev;
2113         }
2114 #ifdef CONFIG_USB_DEVICE_CLASS
2115         usb_classdev_class = class_create(THIS_MODULE, "usb_device");
2116         if (IS_ERR(usb_classdev_class)) {
2117                 printk(KERN_ERR "Unable to register usb_device class\n");
2118                 retval = PTR_ERR(usb_classdev_class);
2119                 cdev_del(&usb_device_cdev);
2120                 usb_classdev_class = NULL;
2121                 goto out;
2122         }
2123         /* devices of this class shadow the major:minor of their parent
2124          * device, so clear ->dev_kobj to prevent adding duplicate entries
2125          * to /sys/dev
2126          */
2127         usb_classdev_class->dev_kobj = NULL;
2128 #endif
2129         usb_register_notify(&usbdev_nb);
2130 out:
2131         return retval;
2132
2133 error_cdev:
2134         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2135         goto out;
2136 }
2137
2138 void usb_devio_cleanup(void)
2139 {
2140         usb_unregister_notify(&usbdev_nb);
2141 #ifdef CONFIG_USB_DEVICE_CLASS
2142         class_destroy(usb_classdev_class);
2143 #endif
2144         cdev_del(&usb_device_cdev);
2145         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2146 }