Merge branch 'topic/oss-fix' into for-linus
[linux-2.6] / 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/smp_lock.h>
41 #include <linux/signal.h>
42 #include <linux/poll.h>
43 #include <linux/module.h>
44 #include <linux/usb.h>
45 #include <linux/usbdevice_fs.h>
46 #include <linux/cdev.h>
47 #include <linux/notifier.h>
48 #include <linux/security.h>
49 #include <asm/uaccess.h>
50 #include <asm/byteorder.h>
51 #include <linux/moduleparam.h>
52
53 #include "hcd.h"        /* for usbcore internals */
54 #include "usb.h"
55
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         uid_t disc_uid, disc_euid;
73         void __user *disccontext;
74         unsigned long ifclaimed;
75         u32 secid;
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 };
91
92 static int usbfs_snoop;
93 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
94 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
95
96 #define snoop(dev, format, arg...)                              \
97         do {                                                    \
98                 if (usbfs_snoop)                                \
99                         dev_info(dev , format , ## arg);        \
100         } while (0)
101
102 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
103
104
105 #define MAX_USBFS_BUFFER_SIZE   16384
106
107 static inline int connected(struct dev_state *ps)
108 {
109         return (!list_empty(&ps->list) &&
110                         ps->dev->state != USB_STATE_NOTATTACHED);
111 }
112
113 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
114 {
115         loff_t ret;
116
117         lock_kernel();
118
119         switch (orig) {
120         case 0:
121                 file->f_pos = offset;
122                 ret = file->f_pos;
123                 break;
124         case 1:
125                 file->f_pos += offset;
126                 ret = file->f_pos;
127                 break;
128         case 2:
129         default:
130                 ret = -EINVAL;
131         }
132
133         unlock_kernel();
134         return ret;
135 }
136
137 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
138                            loff_t *ppos)
139 {
140         struct dev_state *ps = file->private_data;
141         struct usb_device *dev = ps->dev;
142         ssize_t ret = 0;
143         unsigned len;
144         loff_t pos;
145         int i;
146
147         pos = *ppos;
148         usb_lock_device(dev);
149         if (!connected(ps)) {
150                 ret = -ENODEV;
151                 goto err;
152         } else if (pos < 0) {
153                 ret = -EINVAL;
154                 goto err;
155         }
156
157         if (pos < sizeof(struct usb_device_descriptor)) {
158                 /* 18 bytes - fits on the stack */
159                 struct usb_device_descriptor temp_desc;
160
161                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
162                 le16_to_cpus(&temp_desc.bcdUSB);
163                 le16_to_cpus(&temp_desc.idVendor);
164                 le16_to_cpus(&temp_desc.idProduct);
165                 le16_to_cpus(&temp_desc.bcdDevice);
166
167                 len = sizeof(struct usb_device_descriptor) - pos;
168                 if (len > nbytes)
169                         len = nbytes;
170                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
171                         ret = -EFAULT;
172                         goto err;
173                 }
174
175                 *ppos += len;
176                 buf += len;
177                 nbytes -= len;
178                 ret += len;
179         }
180
181         pos = sizeof(struct usb_device_descriptor);
182         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
183                 struct usb_config_descriptor *config =
184                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
185                 unsigned int length = le16_to_cpu(config->wTotalLength);
186
187                 if (*ppos < pos + length) {
188
189                         /* The descriptor may claim to be longer than it
190                          * really is.  Here is the actual allocated length. */
191                         unsigned alloclen =
192                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
193
194                         len = length - (*ppos - pos);
195                         if (len > nbytes)
196                                 len = nbytes;
197
198                         /* Simply don't write (skip over) unallocated parts */
199                         if (alloclen > (*ppos - pos)) {
200                                 alloclen -= (*ppos - pos);
201                                 if (copy_to_user(buf,
202                                     dev->rawdescriptors[i] + (*ppos - pos),
203                                     min(len, alloclen))) {
204                                         ret = -EFAULT;
205                                         goto err;
206                                 }
207                         }
208
209                         *ppos += len;
210                         buf += len;
211                         nbytes -= len;
212                         ret += len;
213                 }
214
215                 pos += length;
216         }
217
218 err:
219         usb_unlock_device(dev);
220         return ret;
221 }
222
223 /*
224  * async list handling
225  */
226
227 static struct async *alloc_async(unsigned int numisoframes)
228 {
229         struct async *as;
230
231         as = kzalloc(sizeof(struct async), GFP_KERNEL);
232         if (!as)
233                 return NULL;
234         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
235         if (!as->urb) {
236                 kfree(as);
237                 return NULL;
238         }
239         return as;
240 }
241
242 static void free_async(struct async *as)
243 {
244         put_pid(as->pid);
245         kfree(as->urb->transfer_buffer);
246         kfree(as->urb->setup_packet);
247         usb_free_urb(as->urb);
248         kfree(as);
249 }
250
251 static inline void async_newpending(struct async *as)
252 {
253         struct dev_state *ps = as->ps;
254         unsigned long flags;
255
256         spin_lock_irqsave(&ps->lock, flags);
257         list_add_tail(&as->asynclist, &ps->async_pending);
258         spin_unlock_irqrestore(&ps->lock, flags);
259 }
260
261 static inline void async_removepending(struct async *as)
262 {
263         struct dev_state *ps = as->ps;
264         unsigned long flags;
265
266         spin_lock_irqsave(&ps->lock, flags);
267         list_del_init(&as->asynclist);
268         spin_unlock_irqrestore(&ps->lock, flags);
269 }
270
271 static inline struct async *async_getcompleted(struct dev_state *ps)
272 {
273         unsigned long flags;
274         struct async *as = NULL;
275
276         spin_lock_irqsave(&ps->lock, flags);
277         if (!list_empty(&ps->async_completed)) {
278                 as = list_entry(ps->async_completed.next, struct async,
279                                 asynclist);
280                 list_del_init(&as->asynclist);
281         }
282         spin_unlock_irqrestore(&ps->lock, flags);
283         return as;
284 }
285
286 static inline struct async *async_getpending(struct dev_state *ps,
287                                              void __user *userurb)
288 {
289         unsigned long flags;
290         struct async *as;
291
292         spin_lock_irqsave(&ps->lock, flags);
293         list_for_each_entry(as, &ps->async_pending, asynclist)
294                 if (as->userurb == userurb) {
295                         list_del_init(&as->asynclist);
296                         spin_unlock_irqrestore(&ps->lock, flags);
297                         return as;
298                 }
299         spin_unlock_irqrestore(&ps->lock, flags);
300         return NULL;
301 }
302
303 static void snoop_urb(struct urb *urb, void __user *userurb)
304 {
305         int j;
306         unsigned char *data = urb->transfer_buffer;
307
308         if (!usbfs_snoop)
309                 return;
310
311         dev_info(&urb->dev->dev, "direction=%s\n",
312                         usb_urb_dir_in(urb) ? "IN" : "OUT");
313         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
314         dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
315                  urb->transfer_buffer_length);
316         dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
317         dev_info(&urb->dev->dev, "data: ");
318         for (j = 0; j < urb->transfer_buffer_length; ++j)
319                 printk("%02x ", data[j]);
320         printk("\n");
321 }
322
323 static void async_completed(struct urb *urb)
324 {
325         struct async *as = urb->context;
326         struct dev_state *ps = as->ps;
327         struct siginfo sinfo;
328
329         spin_lock(&ps->lock);
330         list_move_tail(&as->asynclist, &ps->async_completed);
331         spin_unlock(&ps->lock);
332         as->status = urb->status;
333         if (as->signr) {
334                 sinfo.si_signo = as->signr;
335                 sinfo.si_errno = as->status;
336                 sinfo.si_code = SI_ASYNCIO;
337                 sinfo.si_addr = as->userurb;
338                 kill_pid_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
339                                       as->euid, as->secid);
340         }
341         snoop(&urb->dev->dev, "urb complete\n");
342         snoop_urb(urb, as->userurb);
343         wake_up(&ps->wait);
344 }
345
346 static void destroy_async(struct dev_state *ps, struct list_head *list)
347 {
348         struct async *as;
349         unsigned long flags;
350
351         spin_lock_irqsave(&ps->lock, flags);
352         while (!list_empty(list)) {
353                 as = list_entry(list->next, struct async, asynclist);
354                 list_del_init(&as->asynclist);
355
356                 /* drop the spinlock so the completion handler can run */
357                 spin_unlock_irqrestore(&ps->lock, flags);
358                 usb_kill_urb(as->urb);
359                 spin_lock_irqsave(&ps->lock, flags);
360         }
361         spin_unlock_irqrestore(&ps->lock, flags);
362 }
363
364 static void destroy_async_on_interface(struct dev_state *ps,
365                                        unsigned int ifnum)
366 {
367         struct list_head *p, *q, hitlist;
368         unsigned long flags;
369
370         INIT_LIST_HEAD(&hitlist);
371         spin_lock_irqsave(&ps->lock, flags);
372         list_for_each_safe(p, q, &ps->async_pending)
373                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
374                         list_move_tail(p, &hitlist);
375         spin_unlock_irqrestore(&ps->lock, flags);
376         destroy_async(ps, &hitlist);
377 }
378
379 static inline void destroy_all_async(struct dev_state *ps)
380 {
381         destroy_async(ps, &ps->async_pending);
382 }
383
384 /*
385  * interface claims are made only at the request of user level code,
386  * which can also release them (explicitly or by closing files).
387  * they're also undone when devices disconnect.
388  */
389
390 static int driver_probe(struct usb_interface *intf,
391                         const struct usb_device_id *id)
392 {
393         return -ENODEV;
394 }
395
396 static void driver_disconnect(struct usb_interface *intf)
397 {
398         struct dev_state *ps = usb_get_intfdata(intf);
399         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
400
401         if (!ps)
402                 return;
403
404         /* NOTE:  this relies on usbcore having canceled and completed
405          * all pending I/O requests; 2.6 does that.
406          */
407
408         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
409                 clear_bit(ifnum, &ps->ifclaimed);
410         else
411                 dev_warn(&intf->dev, "interface number %u out of range\n",
412                          ifnum);
413
414         usb_set_intfdata(intf, NULL);
415
416         /* force async requests to complete */
417         destroy_async_on_interface(ps, ifnum);
418 }
419
420 /* The following routines are merely placeholders.  There is no way
421  * to inform a user task about suspend or resumes.
422  */
423 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
424 {
425         return 0;
426 }
427
428 static int driver_resume(struct usb_interface *intf)
429 {
430         return 0;
431 }
432
433 struct usb_driver usbfs_driver = {
434         .name =         "usbfs",
435         .probe =        driver_probe,
436         .disconnect =   driver_disconnect,
437         .suspend =      driver_suspend,
438         .resume =       driver_resume,
439 };
440
441 static int claimintf(struct dev_state *ps, unsigned int ifnum)
442 {
443         struct usb_device *dev = ps->dev;
444         struct usb_interface *intf;
445         int err;
446
447         if (ifnum >= 8*sizeof(ps->ifclaimed))
448                 return -EINVAL;
449         /* already claimed */
450         if (test_bit(ifnum, &ps->ifclaimed))
451                 return 0;
452
453         intf = usb_ifnum_to_if(dev, ifnum);
454         if (!intf)
455                 err = -ENOENT;
456         else
457                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
458         if (err == 0)
459                 set_bit(ifnum, &ps->ifclaimed);
460         return err;
461 }
462
463 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
464 {
465         struct usb_device *dev;
466         struct usb_interface *intf;
467         int err;
468
469         err = -EINVAL;
470         if (ifnum >= 8*sizeof(ps->ifclaimed))
471                 return err;
472         dev = ps->dev;
473         intf = usb_ifnum_to_if(dev, ifnum);
474         if (!intf)
475                 err = -ENOENT;
476         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
477                 usb_driver_release_interface(&usbfs_driver, intf);
478                 err = 0;
479         }
480         return err;
481 }
482
483 static int checkintf(struct dev_state *ps, unsigned int ifnum)
484 {
485         if (ps->dev->state != USB_STATE_CONFIGURED)
486                 return -EHOSTUNREACH;
487         if (ifnum >= 8*sizeof(ps->ifclaimed))
488                 return -EINVAL;
489         if (test_bit(ifnum, &ps->ifclaimed))
490                 return 0;
491         /* if not yet claimed, claim it for the driver */
492         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
493                  "interface %u before use\n", task_pid_nr(current),
494                  current->comm, ifnum);
495         return claimintf(ps, ifnum);
496 }
497
498 static int findintfep(struct usb_device *dev, unsigned int ep)
499 {
500         unsigned int i, j, e;
501         struct usb_interface *intf;
502         struct usb_host_interface *alts;
503         struct usb_endpoint_descriptor *endpt;
504
505         if (ep & ~(USB_DIR_IN|0xf))
506                 return -EINVAL;
507         if (!dev->actconfig)
508                 return -ESRCH;
509         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
510                 intf = dev->actconfig->interface[i];
511                 for (j = 0; j < intf->num_altsetting; j++) {
512                         alts = &intf->altsetting[j];
513                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
514                                 endpt = &alts->endpoint[e].desc;
515                                 if (endpt->bEndpointAddress == ep)
516                                         return alts->desc.bInterfaceNumber;
517                         }
518                 }
519         }
520         return -ENOENT;
521 }
522
523 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
524                            unsigned int index)
525 {
526         int ret = 0;
527
528         if (ps->dev->state != USB_STATE_ADDRESS
529          && ps->dev->state != USB_STATE_CONFIGURED)
530                 return -EHOSTUNREACH;
531         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
532                 return 0;
533
534         index &= 0xff;
535         switch (requesttype & USB_RECIP_MASK) {
536         case USB_RECIP_ENDPOINT:
537                 ret = findintfep(ps->dev, index);
538                 if (ret >= 0)
539                         ret = checkintf(ps, ret);
540                 break;
541
542         case USB_RECIP_INTERFACE:
543                 ret = checkintf(ps, index);
544                 break;
545         }
546         return ret;
547 }
548
549 static int match_devt(struct device *dev, void *data)
550 {
551         return dev->devt == (dev_t) (unsigned long) data;
552 }
553
554 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
555 {
556         struct device *dev;
557
558         dev = bus_find_device(&usb_bus_type, NULL,
559                               (void *) (unsigned long) devt, match_devt);
560         if (!dev)
561                 return NULL;
562         return container_of(dev, struct usb_device, dev);
563 }
564
565 /*
566  * file operations
567  */
568 static int usbdev_open(struct inode *inode, struct file *file)
569 {
570         struct usb_device *dev = NULL;
571         struct dev_state *ps;
572         const struct cred *cred = current_cred();
573         int ret;
574
575         lock_kernel();
576         /* Protect against simultaneous removal or release */
577         mutex_lock(&usbfs_mutex);
578
579         ret = -ENOMEM;
580         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
581         if (!ps)
582                 goto out;
583
584         ret = -ENOENT;
585
586         /* usbdev device-node */
587         if (imajor(inode) == USB_DEVICE_MAJOR)
588                 dev = usbdev_lookup_by_devt(inode->i_rdev);
589 #ifdef CONFIG_USB_DEVICEFS
590         /* procfs file */
591         if (!dev) {
592                 dev = inode->i_private;
593                 if (dev && dev->usbfs_dentry &&
594                                         dev->usbfs_dentry->d_inode == inode)
595                         usb_get_dev(dev);
596                 else
597                         dev = NULL;
598         }
599 #endif
600         if (!dev || dev->state == USB_STATE_NOTATTACHED)
601                 goto out;
602         ret = usb_autoresume_device(dev);
603         if (ret)
604                 goto out;
605
606         ret = 0;
607         ps->dev = dev;
608         ps->file = file;
609         spin_lock_init(&ps->lock);
610         INIT_LIST_HEAD(&ps->list);
611         INIT_LIST_HEAD(&ps->async_pending);
612         INIT_LIST_HEAD(&ps->async_completed);
613         init_waitqueue_head(&ps->wait);
614         ps->discsignr = 0;
615         ps->disc_pid = get_pid(task_pid(current));
616         ps->disc_uid = cred->uid;
617         ps->disc_euid = cred->euid;
618         ps->disccontext = NULL;
619         ps->ifclaimed = 0;
620         security_task_getsecid(current, &ps->secid);
621         smp_wmb();
622         list_add_tail(&ps->list, &dev->filelist);
623         file->private_data = ps;
624         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
625                         current->comm);
626  out:
627         if (ret) {
628                 kfree(ps);
629                 usb_put_dev(dev);
630         }
631         mutex_unlock(&usbfs_mutex);
632         unlock_kernel();
633         return ret;
634 }
635
636 static int usbdev_release(struct inode *inode, struct file *file)
637 {
638         struct dev_state *ps = file->private_data;
639         struct usb_device *dev = ps->dev;
640         unsigned int ifnum;
641         struct async *as;
642
643         usb_lock_device(dev);
644
645         /* Protect against simultaneous open */
646         mutex_lock(&usbfs_mutex);
647         list_del_init(&ps->list);
648         mutex_unlock(&usbfs_mutex);
649
650         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
651                         ifnum++) {
652                 if (test_bit(ifnum, &ps->ifclaimed))
653                         releaseintf(ps, ifnum);
654         }
655         destroy_all_async(ps);
656         usb_autosuspend_device(dev);
657         usb_unlock_device(dev);
658         usb_put_dev(dev);
659         put_pid(ps->disc_pid);
660
661         as = async_getcompleted(ps);
662         while (as) {
663                 free_async(as);
664                 as = async_getcompleted(ps);
665         }
666         kfree(ps);
667         return 0;
668 }
669
670 static int proc_control(struct dev_state *ps, void __user *arg)
671 {
672         struct usb_device *dev = ps->dev;
673         struct usbdevfs_ctrltransfer ctrl;
674         unsigned int tmo;
675         unsigned char *tbuf;
676         unsigned wLength;
677         int i, j, ret;
678
679         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
680                 return -EFAULT;
681         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
682         if (ret)
683                 return ret;
684         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
685         if (wLength > PAGE_SIZE)
686                 return -EINVAL;
687         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
688         if (!tbuf)
689                 return -ENOMEM;
690         tmo = ctrl.timeout;
691         if (ctrl.bRequestType & 0x80) {
692                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
693                                                ctrl.wLength)) {
694                         free_page((unsigned long)tbuf);
695                         return -EINVAL;
696                 }
697                 snoop(&dev->dev, "control read: bRequest=%02x "
698                                 "bRrequestType=%02x wValue=%04x "
699                                 "wIndex=%04x wLength=%04x\n",
700                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
701                                 ctrl.wIndex, ctrl.wLength);
702
703                 usb_unlock_device(dev);
704                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest,
705                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
706                                     tbuf, ctrl.wLength, tmo);
707                 usb_lock_device(dev);
708                 if ((i > 0) && ctrl.wLength) {
709                         if (usbfs_snoop) {
710                                 dev_info(&dev->dev, "control read: data ");
711                                 for (j = 0; j < i; ++j)
712                                         printk("%02x ", (u8)(tbuf)[j]);
713                                 printk("\n");
714                         }
715                         if (copy_to_user(ctrl.data, tbuf, i)) {
716                                 free_page((unsigned long)tbuf);
717                                 return -EFAULT;
718                         }
719                 }
720         } else {
721                 if (ctrl.wLength) {
722                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
723                                 free_page((unsigned long)tbuf);
724                                 return -EFAULT;
725                         }
726                 }
727                 snoop(&dev->dev, "control write: bRequest=%02x "
728                                 "bRrequestType=%02x wValue=%04x "
729                                 "wIndex=%04x wLength=%04x\n",
730                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
731                                 ctrl.wIndex, ctrl.wLength);
732                 if (usbfs_snoop) {
733                         dev_info(&dev->dev, "control write: data: ");
734                         for (j = 0; j < ctrl.wLength; ++j)
735                                 printk("%02x ", (unsigned char)(tbuf)[j]);
736                         printk("\n");
737                 }
738                 usb_unlock_device(dev);
739                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
740                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
741                                     tbuf, ctrl.wLength, tmo);
742                 usb_lock_device(dev);
743         }
744         free_page((unsigned long)tbuf);
745         if (i < 0 && i != -EPIPE) {
746                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
747                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
748                            current->comm, ctrl.bRequestType, ctrl.bRequest,
749                            ctrl.wLength, i);
750         }
751         return i;
752 }
753
754 static int proc_bulk(struct dev_state *ps, void __user *arg)
755 {
756         struct usb_device *dev = ps->dev;
757         struct usbdevfs_bulktransfer bulk;
758         unsigned int tmo, len1, pipe;
759         int len2;
760         unsigned char *tbuf;
761         int i, j, ret;
762
763         if (copy_from_user(&bulk, arg, sizeof(bulk)))
764                 return -EFAULT;
765         ret = findintfep(ps->dev, bulk.ep);
766         if (ret < 0)
767                 return ret;
768         ret = checkintf(ps, ret);
769         if (ret)
770                 return ret;
771         if (bulk.ep & USB_DIR_IN)
772                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
773         else
774                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
775         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
776                 return -EINVAL;
777         len1 = bulk.len;
778         if (len1 > MAX_USBFS_BUFFER_SIZE)
779                 return -EINVAL;
780         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
781                 return -ENOMEM;
782         tmo = bulk.timeout;
783         if (bulk.ep & 0x80) {
784                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
785                         kfree(tbuf);
786                         return -EINVAL;
787                 }
788                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
789                         bulk.len, bulk.timeout);
790                 usb_unlock_device(dev);
791                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
792                 usb_lock_device(dev);
793                 if (!i && len2) {
794                         if (usbfs_snoop) {
795                                 dev_info(&dev->dev, "bulk read: data ");
796                                 for (j = 0; j < len2; ++j)
797                                         printk("%02x ", (u8)(tbuf)[j]);
798                                 printk("\n");
799                         }
800                         if (copy_to_user(bulk.data, tbuf, len2)) {
801                                 kfree(tbuf);
802                                 return -EFAULT;
803                         }
804                 }
805         } else {
806                 if (len1) {
807                         if (copy_from_user(tbuf, bulk.data, len1)) {
808                                 kfree(tbuf);
809                                 return -EFAULT;
810                         }
811                 }
812                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
813                         bulk.len, bulk.timeout);
814                 if (usbfs_snoop) {
815                         dev_info(&dev->dev, "bulk write: data: ");
816                         for (j = 0; j < len1; ++j)
817                                 printk("%02x ", (unsigned char)(tbuf)[j]);
818                         printk("\n");
819                 }
820                 usb_unlock_device(dev);
821                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
822                 usb_lock_device(dev);
823         }
824         kfree(tbuf);
825         if (i < 0)
826                 return i;
827         return len2;
828 }
829
830 static int proc_resetep(struct dev_state *ps, void __user *arg)
831 {
832         unsigned int ep;
833         int ret;
834
835         if (get_user(ep, (unsigned int __user *)arg))
836                 return -EFAULT;
837         ret = findintfep(ps->dev, ep);
838         if (ret < 0)
839                 return ret;
840         ret = checkintf(ps, ret);
841         if (ret)
842                 return ret;
843         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
844         return 0;
845 }
846
847 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
848 {
849         unsigned int ep;
850         int pipe;
851         int ret;
852
853         if (get_user(ep, (unsigned int __user *)arg))
854                 return -EFAULT;
855         ret = findintfep(ps->dev, ep);
856         if (ret < 0)
857                 return ret;
858         ret = checkintf(ps, ret);
859         if (ret)
860                 return ret;
861         if (ep & USB_DIR_IN)
862                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
863         else
864                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
865
866         return usb_clear_halt(ps->dev, pipe);
867 }
868
869 static int proc_getdriver(struct dev_state *ps, void __user *arg)
870 {
871         struct usbdevfs_getdriver gd;
872         struct usb_interface *intf;
873         int ret;
874
875         if (copy_from_user(&gd, arg, sizeof(gd)))
876                 return -EFAULT;
877         intf = usb_ifnum_to_if(ps->dev, gd.interface);
878         if (!intf || !intf->dev.driver)
879                 ret = -ENODATA;
880         else {
881                 strncpy(gd.driver, intf->dev.driver->name,
882                                 sizeof(gd.driver));
883                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
884         }
885         return ret;
886 }
887
888 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
889 {
890         struct usbdevfs_connectinfo ci;
891
892         ci.devnum = ps->dev->devnum;
893         ci.slow = ps->dev->speed == USB_SPEED_LOW;
894         if (copy_to_user(arg, &ci, sizeof(ci)))
895                 return -EFAULT;
896         return 0;
897 }
898
899 static int proc_resetdevice(struct dev_state *ps)
900 {
901         return usb_reset_device(ps->dev);
902 }
903
904 static int proc_setintf(struct dev_state *ps, void __user *arg)
905 {
906         struct usbdevfs_setinterface setintf;
907         int ret;
908
909         if (copy_from_user(&setintf, arg, sizeof(setintf)))
910                 return -EFAULT;
911         if ((ret = checkintf(ps, setintf.interface)))
912                 return ret;
913         return usb_set_interface(ps->dev, setintf.interface,
914                         setintf.altsetting);
915 }
916
917 static int proc_setconfig(struct dev_state *ps, void __user *arg)
918 {
919         int u;
920         int status = 0;
921         struct usb_host_config *actconfig;
922
923         if (get_user(u, (int __user *)arg))
924                 return -EFAULT;
925
926         actconfig = ps->dev->actconfig;
927
928         /* Don't touch the device if any interfaces are claimed.
929          * It could interfere with other drivers' operations, and if
930          * an interface is claimed by usbfs it could easily deadlock.
931          */
932         if (actconfig) {
933                 int i;
934
935                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
936                         if (usb_interface_claimed(actconfig->interface[i])) {
937                                 dev_warn(&ps->dev->dev,
938                                         "usbfs: interface %d claimed by %s "
939                                         "while '%s' sets config #%d\n",
940                                         actconfig->interface[i]
941                                                 ->cur_altsetting
942                                                 ->desc.bInterfaceNumber,
943                                         actconfig->interface[i]
944                                                 ->dev.driver->name,
945                                         current->comm, u);
946                                 status = -EBUSY;
947                                 break;
948                         }
949                 }
950         }
951
952         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
953          * so avoid usb_set_configuration()'s kick to sysfs
954          */
955         if (status == 0) {
956                 if (actconfig && actconfig->desc.bConfigurationValue == u)
957                         status = usb_reset_configuration(ps->dev);
958                 else
959                         status = usb_set_configuration(ps->dev, u);
960         }
961
962         return status;
963 }
964
965 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
966                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
967                         void __user *arg)
968 {
969         struct usbdevfs_iso_packet_desc *isopkt = NULL;
970         struct usb_host_endpoint *ep;
971         struct async *as;
972         struct usb_ctrlrequest *dr = NULL;
973         const struct cred *cred = current_cred();
974         unsigned int u, totlen, isofrmlen;
975         int ret, ifnum = -1;
976         int is_in;
977
978         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
979                                 USBDEVFS_URB_SHORT_NOT_OK |
980                                 USBDEVFS_URB_NO_FSBR |
981                                 USBDEVFS_URB_ZERO_PACKET |
982                                 USBDEVFS_URB_NO_INTERRUPT))
983                 return -EINVAL;
984         if (!uurb->buffer)
985                 return -EINVAL;
986         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
987             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
988                 ifnum = findintfep(ps->dev, uurb->endpoint);
989                 if (ifnum < 0)
990                         return ifnum;
991                 ret = checkintf(ps, ifnum);
992                 if (ret)
993                         return ret;
994         }
995         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
996                 is_in = 1;
997                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
998         } else {
999                 is_in = 0;
1000                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1001         }
1002         if (!ep)
1003                 return -ENOENT;
1004         switch(uurb->type) {
1005         case USBDEVFS_URB_TYPE_CONTROL:
1006                 if (!usb_endpoint_xfer_control(&ep->desc))
1007                         return -EINVAL;
1008                 /* min 8 byte setup packet,
1009                  * max 8 byte setup plus an arbitrary data stage */
1010                 if (uurb->buffer_length < 8 ||
1011                     uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1012                         return -EINVAL;
1013                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1014                 if (!dr)
1015                         return -ENOMEM;
1016                 if (copy_from_user(dr, uurb->buffer, 8)) {
1017                         kfree(dr);
1018                         return -EFAULT;
1019                 }
1020                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1021                         kfree(dr);
1022                         return -EINVAL;
1023                 }
1024                 ret = check_ctrlrecip(ps, dr->bRequestType,
1025                                       le16_to_cpup(&dr->wIndex));
1026                 if (ret) {
1027                         kfree(dr);
1028                         return ret;
1029                 }
1030                 uurb->number_of_packets = 0;
1031                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1032                 uurb->buffer += 8;
1033                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1034                         is_in = 1;
1035                         uurb->endpoint |= USB_DIR_IN;
1036                 } else {
1037                         is_in = 0;
1038                         uurb->endpoint &= ~USB_DIR_IN;
1039                 }
1040                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1041                                 uurb->buffer, uurb->buffer_length)) {
1042                         kfree(dr);
1043                         return -EFAULT;
1044                 }
1045                 snoop(&ps->dev->dev, "control urb: bRequest=%02x "
1046                         "bRrequestType=%02x wValue=%04x "
1047                         "wIndex=%04x wLength=%04x\n",
1048                         dr->bRequest, dr->bRequestType,
1049                         __le16_to_cpup(&dr->wValue),
1050                         __le16_to_cpup(&dr->wIndex),
1051                         __le16_to_cpup(&dr->wLength));
1052                 break;
1053
1054         case USBDEVFS_URB_TYPE_BULK:
1055                 switch (usb_endpoint_type(&ep->desc)) {
1056                 case USB_ENDPOINT_XFER_CONTROL:
1057                 case USB_ENDPOINT_XFER_ISOC:
1058                         return -EINVAL;
1059                 /* allow single-shot interrupt transfers, at bogus rates */
1060                 }
1061                 uurb->number_of_packets = 0;
1062                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1063                         return -EINVAL;
1064                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1065                                 uurb->buffer, uurb->buffer_length))
1066                         return -EFAULT;
1067                 snoop(&ps->dev->dev, "bulk urb\n");
1068                 break;
1069
1070         case USBDEVFS_URB_TYPE_ISO:
1071                 /* arbitrary limit */
1072                 if (uurb->number_of_packets < 1 ||
1073                     uurb->number_of_packets > 128)
1074                         return -EINVAL;
1075                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1076                         return -EINVAL;
1077                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1078                                    uurb->number_of_packets;
1079                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1080                         return -ENOMEM;
1081                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1082                         kfree(isopkt);
1083                         return -EFAULT;
1084                 }
1085                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1086                         /* arbitrary limit,
1087                          * sufficient for USB 2.0 high-bandwidth iso */
1088                         if (isopkt[u].length > 8192) {
1089                                 kfree(isopkt);
1090                                 return -EINVAL;
1091                         }
1092                         totlen += isopkt[u].length;
1093                 }
1094                 if (totlen > 32768) {
1095                         kfree(isopkt);
1096                         return -EINVAL;
1097                 }
1098                 uurb->buffer_length = totlen;
1099                 snoop(&ps->dev->dev, "iso urb\n");
1100                 break;
1101
1102         case USBDEVFS_URB_TYPE_INTERRUPT:
1103                 uurb->number_of_packets = 0;
1104                 if (!usb_endpoint_xfer_int(&ep->desc))
1105                         return -EINVAL;
1106                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1107                         return -EINVAL;
1108                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1109                                 uurb->buffer, uurb->buffer_length))
1110                         return -EFAULT;
1111                 snoop(&ps->dev->dev, "interrupt urb\n");
1112                 break;
1113
1114         default:
1115                 return -EINVAL;
1116         }
1117         as = alloc_async(uurb->number_of_packets);
1118         if (!as) {
1119                 kfree(isopkt);
1120                 kfree(dr);
1121                 return -ENOMEM;
1122         }
1123         as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL);
1124         if (!as->urb->transfer_buffer) {
1125                 kfree(isopkt);
1126                 kfree(dr);
1127                 free_async(as);
1128                 return -ENOMEM;
1129         }
1130         as->urb->dev = ps->dev;
1131         as->urb->pipe = (uurb->type << 30) |
1132                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1133                         (uurb->endpoint & USB_DIR_IN);
1134
1135         /* This tedious sequence is necessary because the URB_* flags
1136          * are internal to the kernel and subject to change, whereas
1137          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1138          */
1139         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1140         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1141                 u |= URB_ISO_ASAP;
1142         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1143                 u |= URB_SHORT_NOT_OK;
1144         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1145                 u |= URB_NO_FSBR;
1146         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1147                 u |= URB_ZERO_PACKET;
1148         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1149                 u |= URB_NO_INTERRUPT;
1150         as->urb->transfer_flags = u;
1151
1152         as->urb->transfer_buffer_length = uurb->buffer_length;
1153         as->urb->setup_packet = (unsigned char *)dr;
1154         as->urb->start_frame = uurb->start_frame;
1155         as->urb->number_of_packets = uurb->number_of_packets;
1156         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1157                         ps->dev->speed == USB_SPEED_HIGH)
1158                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1159         else
1160                 as->urb->interval = ep->desc.bInterval;
1161         as->urb->context = as;
1162         as->urb->complete = async_completed;
1163         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1164                 as->urb->iso_frame_desc[u].offset = totlen;
1165                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1166                 totlen += isopkt[u].length;
1167         }
1168         kfree(isopkt);
1169         as->ps = ps;
1170         as->userurb = arg;
1171         if (uurb->endpoint & USB_DIR_IN)
1172                 as->userbuffer = uurb->buffer;
1173         else
1174                 as->userbuffer = NULL;
1175         as->signr = uurb->signr;
1176         as->ifnum = ifnum;
1177         as->pid = get_pid(task_pid(current));
1178         as->uid = cred->uid;
1179         as->euid = cred->euid;
1180         security_task_getsecid(current, &as->secid);
1181         if (!is_in) {
1182                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1183                                 as->urb->transfer_buffer_length)) {
1184                         free_async(as);
1185                         return -EFAULT;
1186                 }
1187         }
1188         snoop_urb(as->urb, as->userurb);
1189         async_newpending(as);
1190         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1191                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1192                            "usbfs: usb_submit_urb returned %d\n", ret);
1193                 async_removepending(as);
1194                 free_async(as);
1195                 return ret;
1196         }
1197         return 0;
1198 }
1199
1200 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1201 {
1202         struct usbdevfs_urb uurb;
1203
1204         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1205                 return -EFAULT;
1206
1207         return proc_do_submiturb(ps, &uurb,
1208                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1209                         arg);
1210 }
1211
1212 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1213 {
1214         struct async *as;
1215
1216         as = async_getpending(ps, arg);
1217         if (!as)
1218                 return -EINVAL;
1219         usb_kill_urb(as->urb);
1220         return 0;
1221 }
1222
1223 static int processcompl(struct async *as, void __user * __user *arg)
1224 {
1225         struct urb *urb = as->urb;
1226         struct usbdevfs_urb __user *userurb = as->userurb;
1227         void __user *addr = as->userurb;
1228         unsigned int i;
1229
1230         if (as->userbuffer)
1231                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1232                                  urb->transfer_buffer_length))
1233                         return -EFAULT;
1234         if (put_user(as->status, &userurb->status))
1235                 return -EFAULT;
1236         if (put_user(urb->actual_length, &userurb->actual_length))
1237                 return -EFAULT;
1238         if (put_user(urb->error_count, &userurb->error_count))
1239                 return -EFAULT;
1240
1241         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1242                 for (i = 0; i < urb->number_of_packets; i++) {
1243                         if (put_user(urb->iso_frame_desc[i].actual_length,
1244                                      &userurb->iso_frame_desc[i].actual_length))
1245                                 return -EFAULT;
1246                         if (put_user(urb->iso_frame_desc[i].status,
1247                                      &userurb->iso_frame_desc[i].status))
1248                                 return -EFAULT;
1249                 }
1250         }
1251
1252         free_async(as);
1253
1254         if (put_user(addr, (void __user * __user *)arg))
1255                 return -EFAULT;
1256         return 0;
1257 }
1258
1259 static struct async *reap_as(struct dev_state *ps)
1260 {
1261         DECLARE_WAITQUEUE(wait, current);
1262         struct async *as = NULL;
1263         struct usb_device *dev = ps->dev;
1264
1265         add_wait_queue(&ps->wait, &wait);
1266         for (;;) {
1267                 __set_current_state(TASK_INTERRUPTIBLE);
1268                 as = async_getcompleted(ps);
1269                 if (as)
1270                         break;
1271                 if (signal_pending(current))
1272                         break;
1273                 usb_unlock_device(dev);
1274                 schedule();
1275                 usb_lock_device(dev);
1276         }
1277         remove_wait_queue(&ps->wait, &wait);
1278         set_current_state(TASK_RUNNING);
1279         return as;
1280 }
1281
1282 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1283 {
1284         struct async *as = reap_as(ps);
1285         if (as)
1286                 return processcompl(as, (void __user * __user *)arg);
1287         if (signal_pending(current))
1288                 return -EINTR;
1289         return -EIO;
1290 }
1291
1292 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1293 {
1294         struct async *as;
1295
1296         if (!(as = async_getcompleted(ps)))
1297                 return -EAGAIN;
1298         return processcompl(as, (void __user * __user *)arg);
1299 }
1300
1301 #ifdef CONFIG_COMPAT
1302
1303 static int get_urb32(struct usbdevfs_urb *kurb,
1304                      struct usbdevfs_urb32 __user *uurb)
1305 {
1306         __u32  uptr;
1307         if (get_user(kurb->type, &uurb->type) ||
1308             __get_user(kurb->endpoint, &uurb->endpoint) ||
1309             __get_user(kurb->status, &uurb->status) ||
1310             __get_user(kurb->flags, &uurb->flags) ||
1311             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1312             __get_user(kurb->actual_length, &uurb->actual_length) ||
1313             __get_user(kurb->start_frame, &uurb->start_frame) ||
1314             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1315             __get_user(kurb->error_count, &uurb->error_count) ||
1316             __get_user(kurb->signr, &uurb->signr))
1317                 return -EFAULT;
1318
1319         if (__get_user(uptr, &uurb->buffer))
1320                 return -EFAULT;
1321         kurb->buffer = compat_ptr(uptr);
1322         if (__get_user(uptr, &uurb->usercontext))
1323                 return -EFAULT;
1324         kurb->usercontext = compat_ptr(uptr);
1325
1326         return 0;
1327 }
1328
1329 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1330 {
1331         struct usbdevfs_urb uurb;
1332
1333         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1334                 return -EFAULT;
1335
1336         return proc_do_submiturb(ps, &uurb,
1337                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1338                         arg);
1339 }
1340
1341 static int processcompl_compat(struct async *as, void __user * __user *arg)
1342 {
1343         struct urb *urb = as->urb;
1344         struct usbdevfs_urb32 __user *userurb = as->userurb;
1345         void __user *addr = as->userurb;
1346         unsigned int i;
1347
1348         if (as->userbuffer)
1349                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1350                                  urb->transfer_buffer_length))
1351                         return -EFAULT;
1352         if (put_user(as->status, &userurb->status))
1353                 return -EFAULT;
1354         if (put_user(urb->actual_length, &userurb->actual_length))
1355                 return -EFAULT;
1356         if (put_user(urb->error_count, &userurb->error_count))
1357                 return -EFAULT;
1358
1359         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1360                 for (i = 0; i < urb->number_of_packets; i++) {
1361                         if (put_user(urb->iso_frame_desc[i].actual_length,
1362                                      &userurb->iso_frame_desc[i].actual_length))
1363                                 return -EFAULT;
1364                         if (put_user(urb->iso_frame_desc[i].status,
1365                                      &userurb->iso_frame_desc[i].status))
1366                                 return -EFAULT;
1367                 }
1368         }
1369
1370         free_async(as);
1371         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1372                 return -EFAULT;
1373         return 0;
1374 }
1375
1376 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1377 {
1378         struct async *as = reap_as(ps);
1379         if (as)
1380                 return processcompl_compat(as, (void __user * __user *)arg);
1381         if (signal_pending(current))
1382                 return -EINTR;
1383         return -EIO;
1384 }
1385
1386 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1387 {
1388         struct async *as;
1389
1390         if (!(as = async_getcompleted(ps)))
1391                 return -EAGAIN;
1392         return processcompl_compat(as, (void __user * __user *)arg);
1393 }
1394
1395 #endif
1396
1397 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1398 {
1399         struct usbdevfs_disconnectsignal ds;
1400
1401         if (copy_from_user(&ds, arg, sizeof(ds)))
1402                 return -EFAULT;
1403         ps->discsignr = ds.signr;
1404         ps->disccontext = ds.context;
1405         return 0;
1406 }
1407
1408 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1409 {
1410         unsigned int ifnum;
1411
1412         if (get_user(ifnum, (unsigned int __user *)arg))
1413                 return -EFAULT;
1414         return claimintf(ps, ifnum);
1415 }
1416
1417 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1418 {
1419         unsigned int ifnum;
1420         int ret;
1421
1422         if (get_user(ifnum, (unsigned int __user *)arg))
1423                 return -EFAULT;
1424         if ((ret = releaseintf(ps, ifnum)) < 0)
1425                 return ret;
1426         destroy_async_on_interface (ps, ifnum);
1427         return 0;
1428 }
1429
1430 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1431 {
1432         int                     size;
1433         void                    *buf = NULL;
1434         int                     retval = 0;
1435         struct usb_interface    *intf = NULL;
1436         struct usb_driver       *driver = NULL;
1437
1438         /* alloc buffer */
1439         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1440                 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1441                         return -ENOMEM;
1442                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1443                         if (copy_from_user(buf, ctl->data, size)) {
1444                                 kfree(buf);
1445                                 return -EFAULT;
1446                         }
1447                 } else {
1448                         memset(buf, 0, size);
1449                 }
1450         }
1451
1452         if (!connected(ps)) {
1453                 kfree(buf);
1454                 return -ENODEV;
1455         }
1456
1457         if (ps->dev->state != USB_STATE_CONFIGURED)
1458                 retval = -EHOSTUNREACH;
1459         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1460                 retval = -EINVAL;
1461         else switch (ctl->ioctl_code) {
1462
1463         /* disconnect kernel driver from interface */
1464         case USBDEVFS_DISCONNECT:
1465                 if (intf->dev.driver) {
1466                         driver = to_usb_driver(intf->dev.driver);
1467                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1468                         usb_driver_release_interface(driver, intf);
1469                 } else
1470                         retval = -ENODATA;
1471                 break;
1472
1473         /* let kernel drivers try to (re)bind to the interface */
1474         case USBDEVFS_CONNECT:
1475                 if (!intf->dev.driver)
1476                         retval = device_attach(&intf->dev);
1477                 else
1478                         retval = -EBUSY;
1479                 break;
1480
1481         /* talk directly to the interface's driver */
1482         default:
1483                 if (intf->dev.driver)
1484                         driver = to_usb_driver(intf->dev.driver);
1485                 if (driver == NULL || driver->ioctl == NULL) {
1486                         retval = -ENOTTY;
1487                 } else {
1488                         retval = driver->ioctl(intf, ctl->ioctl_code, buf);
1489                         if (retval == -ENOIOCTLCMD)
1490                                 retval = -ENOTTY;
1491                 }
1492         }
1493
1494         /* cleanup and return */
1495         if (retval >= 0
1496                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1497                         && size > 0
1498                         && copy_to_user(ctl->data, buf, size) != 0)
1499                 retval = -EFAULT;
1500
1501         kfree(buf);
1502         return retval;
1503 }
1504
1505 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1506 {
1507         struct usbdevfs_ioctl   ctrl;
1508
1509         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1510                 return -EFAULT;
1511         return proc_ioctl(ps, &ctrl);
1512 }
1513
1514 #ifdef CONFIG_COMPAT
1515 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1516 {
1517         struct usbdevfs_ioctl32 __user *uioc;
1518         struct usbdevfs_ioctl ctrl;
1519         u32 udata;
1520
1521         uioc = compat_ptr((long)arg);
1522         if (get_user(ctrl.ifno, &uioc->ifno) ||
1523             get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1524             __get_user(udata, &uioc->data))
1525                 return -EFAULT;
1526         ctrl.data = compat_ptr(udata);
1527
1528         return proc_ioctl(ps, &ctrl);
1529 }
1530 #endif
1531
1532 /*
1533  * NOTE:  All requests here that have interface numbers as parameters
1534  * are assuming that somehow the configuration has been prevented from
1535  * changing.  But there's no mechanism to ensure that...
1536  */
1537 static int usbdev_ioctl(struct inode *inode, struct file *file,
1538                         unsigned int cmd, unsigned long arg)
1539 {
1540         struct dev_state *ps = file->private_data;
1541         struct usb_device *dev = ps->dev;
1542         void __user *p = (void __user *)arg;
1543         int ret = -ENOTTY;
1544
1545         if (!(file->f_mode & FMODE_WRITE))
1546                 return -EPERM;
1547         usb_lock_device(dev);
1548         if (!connected(ps)) {
1549                 usb_unlock_device(dev);
1550                 return -ENODEV;
1551         }
1552
1553         switch (cmd) {
1554         case USBDEVFS_CONTROL:
1555                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1556                 ret = proc_control(ps, p);
1557                 if (ret >= 0)
1558                         inode->i_mtime = CURRENT_TIME;
1559                 break;
1560
1561         case USBDEVFS_BULK:
1562                 snoop(&dev->dev, "%s: BULK\n", __func__);
1563                 ret = proc_bulk(ps, p);
1564                 if (ret >= 0)
1565                         inode->i_mtime = CURRENT_TIME;
1566                 break;
1567
1568         case USBDEVFS_RESETEP:
1569                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1570                 ret = proc_resetep(ps, p);
1571                 if (ret >= 0)
1572                         inode->i_mtime = CURRENT_TIME;
1573                 break;
1574
1575         case USBDEVFS_RESET:
1576                 snoop(&dev->dev, "%s: RESET\n", __func__);
1577                 ret = proc_resetdevice(ps);
1578                 break;
1579
1580         case USBDEVFS_CLEAR_HALT:
1581                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1582                 ret = proc_clearhalt(ps, p);
1583                 if (ret >= 0)
1584                         inode->i_mtime = CURRENT_TIME;
1585                 break;
1586
1587         case USBDEVFS_GETDRIVER:
1588                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1589                 ret = proc_getdriver(ps, p);
1590                 break;
1591
1592         case USBDEVFS_CONNECTINFO:
1593                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1594                 ret = proc_connectinfo(ps, p);
1595                 break;
1596
1597         case USBDEVFS_SETINTERFACE:
1598                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1599                 ret = proc_setintf(ps, p);
1600                 break;
1601
1602         case USBDEVFS_SETCONFIGURATION:
1603                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1604                 ret = proc_setconfig(ps, p);
1605                 break;
1606
1607         case USBDEVFS_SUBMITURB:
1608                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1609                 ret = proc_submiturb(ps, p);
1610                 if (ret >= 0)
1611                         inode->i_mtime = CURRENT_TIME;
1612                 break;
1613
1614 #ifdef CONFIG_COMPAT
1615
1616         case USBDEVFS_SUBMITURB32:
1617                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1618                 ret = proc_submiturb_compat(ps, p);
1619                 if (ret >= 0)
1620                         inode->i_mtime = CURRENT_TIME;
1621                 break;
1622
1623         case USBDEVFS_REAPURB32:
1624                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1625                 ret = proc_reapurb_compat(ps, p);
1626                 break;
1627
1628         case USBDEVFS_REAPURBNDELAY32:
1629                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __func__);
1630                 ret = proc_reapurbnonblock_compat(ps, p);
1631                 break;
1632
1633         case USBDEVFS_IOCTL32:
1634                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1635                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1636                 break;
1637 #endif
1638
1639         case USBDEVFS_DISCARDURB:
1640                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1641                 ret = proc_unlinkurb(ps, p);
1642                 break;
1643
1644         case USBDEVFS_REAPURB:
1645                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1646                 ret = proc_reapurb(ps, p);
1647                 break;
1648
1649         case USBDEVFS_REAPURBNDELAY:
1650                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __func__);
1651                 ret = proc_reapurbnonblock(ps, p);
1652                 break;
1653
1654         case USBDEVFS_DISCSIGNAL:
1655                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1656                 ret = proc_disconnectsignal(ps, p);
1657                 break;
1658
1659         case USBDEVFS_CLAIMINTERFACE:
1660                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1661                 ret = proc_claiminterface(ps, p);
1662                 break;
1663
1664         case USBDEVFS_RELEASEINTERFACE:
1665                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1666                 ret = proc_releaseinterface(ps, p);
1667                 break;
1668
1669         case USBDEVFS_IOCTL:
1670                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1671                 ret = proc_ioctl_default(ps, p);
1672                 break;
1673         }
1674         usb_unlock_device(dev);
1675         if (ret >= 0)
1676                 inode->i_atime = CURRENT_TIME;
1677         return ret;
1678 }
1679
1680 /* No kernel lock - fine */
1681 static unsigned int usbdev_poll(struct file *file,
1682                                 struct poll_table_struct *wait)
1683 {
1684         struct dev_state *ps = file->private_data;
1685         unsigned int mask = 0;
1686
1687         poll_wait(file, &ps->wait, wait);
1688         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1689                 mask |= POLLOUT | POLLWRNORM;
1690         if (!connected(ps))
1691                 mask |= POLLERR | POLLHUP;
1692         return mask;
1693 }
1694
1695 const struct file_operations usbdev_file_operations = {
1696         .owner =        THIS_MODULE,
1697         .llseek =       usbdev_lseek,
1698         .read =         usbdev_read,
1699         .poll =         usbdev_poll,
1700         .ioctl =        usbdev_ioctl,
1701         .open =         usbdev_open,
1702         .release =      usbdev_release,
1703 };
1704
1705 static void usbdev_remove(struct usb_device *udev)
1706 {
1707         struct dev_state *ps;
1708         struct siginfo sinfo;
1709
1710         while (!list_empty(&udev->filelist)) {
1711                 ps = list_entry(udev->filelist.next, struct dev_state, list);
1712                 destroy_all_async(ps);
1713                 wake_up_all(&ps->wait);
1714                 list_del_init(&ps->list);
1715                 if (ps->discsignr) {
1716                         sinfo.si_signo = ps->discsignr;
1717                         sinfo.si_errno = EPIPE;
1718                         sinfo.si_code = SI_ASYNCIO;
1719                         sinfo.si_addr = ps->disccontext;
1720                         kill_pid_info_as_uid(ps->discsignr, &sinfo,
1721                                         ps->disc_pid, ps->disc_uid,
1722                                         ps->disc_euid, ps->secid);
1723                 }
1724         }
1725 }
1726
1727 #ifdef CONFIG_USB_DEVICE_CLASS
1728 static struct class *usb_classdev_class;
1729
1730 static int usb_classdev_add(struct usb_device *dev)
1731 {
1732         struct device *cldev;
1733
1734         cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
1735                               NULL, "usbdev%d.%d", dev->bus->busnum,
1736                               dev->devnum);
1737         if (IS_ERR(cldev))
1738                 return PTR_ERR(cldev);
1739         dev->usb_classdev = cldev;
1740         return 0;
1741 }
1742
1743 static void usb_classdev_remove(struct usb_device *dev)
1744 {
1745         if (dev->usb_classdev)
1746                 device_unregister(dev->usb_classdev);
1747 }
1748
1749 #else
1750 #define usb_classdev_add(dev)           0
1751 #define usb_classdev_remove(dev)        do {} while (0)
1752
1753 #endif
1754
1755 static int usbdev_notify(struct notifier_block *self,
1756                                unsigned long action, void *dev)
1757 {
1758         switch (action) {
1759         case USB_DEVICE_ADD:
1760                 if (usb_classdev_add(dev))
1761                         return NOTIFY_BAD;
1762                 break;
1763         case USB_DEVICE_REMOVE:
1764                 usb_classdev_remove(dev);
1765                 usbdev_remove(dev);
1766                 break;
1767         }
1768         return NOTIFY_OK;
1769 }
1770
1771 static struct notifier_block usbdev_nb = {
1772         .notifier_call =        usbdev_notify,
1773 };
1774
1775 static struct cdev usb_device_cdev;
1776
1777 int __init usb_devio_init(void)
1778 {
1779         int retval;
1780
1781         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1782                                         "usb_device");
1783         if (retval) {
1784                 printk(KERN_ERR "Unable to register minors for usb_device\n");
1785                 goto out;
1786         }
1787         cdev_init(&usb_device_cdev, &usbdev_file_operations);
1788         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1789         if (retval) {
1790                 printk(KERN_ERR "Unable to get usb_device major %d\n",
1791                        USB_DEVICE_MAJOR);
1792                 goto error_cdev;
1793         }
1794 #ifdef CONFIG_USB_DEVICE_CLASS
1795         usb_classdev_class = class_create(THIS_MODULE, "usb_device");
1796         if (IS_ERR(usb_classdev_class)) {
1797                 printk(KERN_ERR "Unable to register usb_device class\n");
1798                 retval = PTR_ERR(usb_classdev_class);
1799                 cdev_del(&usb_device_cdev);
1800                 usb_classdev_class = NULL;
1801                 goto out;
1802         }
1803         /* devices of this class shadow the major:minor of their parent
1804          * device, so clear ->dev_kobj to prevent adding duplicate entries
1805          * to /sys/dev
1806          */
1807         usb_classdev_class->dev_kobj = NULL;
1808 #endif
1809         usb_register_notify(&usbdev_nb);
1810 out:
1811         return retval;
1812
1813 error_cdev:
1814         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1815         goto out;
1816 }
1817
1818 void usb_devio_cleanup(void)
1819 {
1820         usb_unregister_notify(&usbdev_nb);
1821 #ifdef CONFIG_USB_DEVICE_CLASS
1822         class_destroy(usb_classdev_class);
1823 #endif
1824         cdev_del(&usb_device_cdev);
1825         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1826 }