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