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