USB: remove CVS keywords
[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 async {
63         struct list_head asynclist;
64         struct dev_state *ps;
65         struct pid *pid;
66         uid_t uid, euid;
67         unsigned int signr;
68         unsigned int ifnum;
69         void __user *userbuffer;
70         void __user *userurb;
71         struct urb *urb;
72         int status;
73         u32 secid;
74 };
75
76 static int usbfs_snoop;
77 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
78 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
79
80 #define snoop(dev, format, arg...)                              \
81         do {                                                    \
82                 if (usbfs_snoop)                                \
83                         dev_info(dev , format , ## arg);        \
84         } while (0)
85
86 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
87
88
89 #define MAX_USBFS_BUFFER_SIZE   16384
90
91 static inline int connected(struct dev_state *ps)
92 {
93         return (!list_empty(&ps->list) &&
94                         ps->dev->state != USB_STATE_NOTATTACHED);
95 }
96
97 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
98 {
99         loff_t ret;
100
101         lock_kernel();
102
103         switch (orig) {
104         case 0:
105                 file->f_pos = offset;
106                 ret = file->f_pos;
107                 break;
108         case 1:
109                 file->f_pos += offset;
110                 ret = file->f_pos;
111                 break;
112         case 2:
113         default:
114                 ret = -EINVAL;
115         }
116
117         unlock_kernel();
118         return ret;
119 }
120
121 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
122                            loff_t *ppos)
123 {
124         struct dev_state *ps = file->private_data;
125         struct usb_device *dev = ps->dev;
126         ssize_t ret = 0;
127         unsigned len;
128         loff_t pos;
129         int i;
130
131         pos = *ppos;
132         usb_lock_device(dev);
133         if (!connected(ps)) {
134                 ret = -ENODEV;
135                 goto err;
136         } else if (pos < 0) {
137                 ret = -EINVAL;
138                 goto err;
139         }
140
141         if (pos < sizeof(struct usb_device_descriptor)) {
142                 /* 18 bytes - fits on the stack */
143                 struct usb_device_descriptor temp_desc;
144
145                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
146                 le16_to_cpus(&temp_desc.bcdUSB);
147                 le16_to_cpus(&temp_desc.idVendor);
148                 le16_to_cpus(&temp_desc.idProduct);
149                 le16_to_cpus(&temp_desc.bcdDevice);
150
151                 len = sizeof(struct usb_device_descriptor) - pos;
152                 if (len > nbytes)
153                         len = nbytes;
154                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
155                         ret = -EFAULT;
156                         goto err;
157                 }
158
159                 *ppos += len;
160                 buf += len;
161                 nbytes -= len;
162                 ret += len;
163         }
164
165         pos = sizeof(struct usb_device_descriptor);
166         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
167                 struct usb_config_descriptor *config =
168                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
169                 unsigned int length = le16_to_cpu(config->wTotalLength);
170
171                 if (*ppos < pos + length) {
172
173                         /* The descriptor may claim to be longer than it
174                          * really is.  Here is the actual allocated length. */
175                         unsigned alloclen =
176                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
177
178                         len = length - (*ppos - pos);
179                         if (len > nbytes)
180                                 len = nbytes;
181
182                         /* Simply don't write (skip over) unallocated parts */
183                         if (alloclen > (*ppos - pos)) {
184                                 alloclen -= (*ppos - pos);
185                                 if (copy_to_user(buf,
186                                     dev->rawdescriptors[i] + (*ppos - pos),
187                                     min(len, alloclen))) {
188                                         ret = -EFAULT;
189                                         goto err;
190                                 }
191                         }
192
193                         *ppos += len;
194                         buf += len;
195                         nbytes -= len;
196                         ret += len;
197                 }
198
199                 pos += length;
200         }
201
202 err:
203         usb_unlock_device(dev);
204         return ret;
205 }
206
207 /*
208  * async list handling
209  */
210
211 static struct async *alloc_async(unsigned int numisoframes)
212 {
213         struct async *as;
214
215         as = kzalloc(sizeof(struct async), GFP_KERNEL);
216         if (!as)
217                 return NULL;
218         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
219         if (!as->urb) {
220                 kfree(as);
221                 return NULL;
222         }
223         return as;
224 }
225
226 static void free_async(struct async *as)
227 {
228         put_pid(as->pid);
229         kfree(as->urb->transfer_buffer);
230         kfree(as->urb->setup_packet);
231         usb_free_urb(as->urb);
232         kfree(as);
233 }
234
235 static inline void async_newpending(struct async *as)
236 {
237         struct dev_state *ps = as->ps;
238         unsigned long flags;
239
240         spin_lock_irqsave(&ps->lock, flags);
241         list_add_tail(&as->asynclist, &ps->async_pending);
242         spin_unlock_irqrestore(&ps->lock, flags);
243 }
244
245 static inline void async_removepending(struct async *as)
246 {
247         struct dev_state *ps = as->ps;
248         unsigned long flags;
249
250         spin_lock_irqsave(&ps->lock, flags);
251         list_del_init(&as->asynclist);
252         spin_unlock_irqrestore(&ps->lock, flags);
253 }
254
255 static inline struct async *async_getcompleted(struct dev_state *ps)
256 {
257         unsigned long flags;
258         struct async *as = NULL;
259
260         spin_lock_irqsave(&ps->lock, flags);
261         if (!list_empty(&ps->async_completed)) {
262                 as = list_entry(ps->async_completed.next, struct async,
263                                 asynclist);
264                 list_del_init(&as->asynclist);
265         }
266         spin_unlock_irqrestore(&ps->lock, flags);
267         return as;
268 }
269
270 static inline struct async *async_getpending(struct dev_state *ps,
271                                              void __user *userurb)
272 {
273         unsigned long flags;
274         struct async *as;
275
276         spin_lock_irqsave(&ps->lock, flags);
277         list_for_each_entry(as, &ps->async_pending, asynclist)
278                 if (as->userurb == userurb) {
279                         list_del_init(&as->asynclist);
280                         spin_unlock_irqrestore(&ps->lock, flags);
281                         return as;
282                 }
283         spin_unlock_irqrestore(&ps->lock, flags);
284         return NULL;
285 }
286
287 static void snoop_urb(struct urb *urb, void __user *userurb)
288 {
289         int j;
290         unsigned char *data = urb->transfer_buffer;
291
292         if (!usbfs_snoop)
293                 return;
294
295         dev_info(&urb->dev->dev, "direction=%s\n",
296                         usb_urb_dir_in(urb) ? "IN" : "OUT");
297         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
298         dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
299                  urb->transfer_buffer_length);
300         dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
301         dev_info(&urb->dev->dev, "data: ");
302         for (j = 0; j < urb->transfer_buffer_length; ++j)
303                 printk("%02x ", data[j]);
304         printk("\n");
305 }
306
307 static void async_completed(struct urb *urb)
308 {
309         struct async *as = urb->context;
310         struct dev_state *ps = as->ps;
311         struct siginfo sinfo;
312
313         spin_lock(&ps->lock);
314         list_move_tail(&as->asynclist, &ps->async_completed);
315         spin_unlock(&ps->lock);
316         as->status = urb->status;
317         if (as->signr) {
318                 sinfo.si_signo = as->signr;
319                 sinfo.si_errno = as->status;
320                 sinfo.si_code = SI_ASYNCIO;
321                 sinfo.si_addr = as->userurb;
322                 kill_pid_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
323                                       as->euid, as->secid);
324         }
325         snoop(&urb->dev->dev, "urb complete\n");
326         snoop_urb(urb, as->userurb);
327         wake_up(&ps->wait);
328 }
329
330 static void destroy_async(struct dev_state *ps, struct list_head *list)
331 {
332         struct async *as;
333         unsigned long flags;
334
335         spin_lock_irqsave(&ps->lock, flags);
336         while (!list_empty(list)) {
337                 as = list_entry(list->next, struct async, asynclist);
338                 list_del_init(&as->asynclist);
339
340                 /* drop the spinlock so the completion handler can run */
341                 spin_unlock_irqrestore(&ps->lock, flags);
342                 usb_kill_urb(as->urb);
343                 spin_lock_irqsave(&ps->lock, flags);
344         }
345         spin_unlock_irqrestore(&ps->lock, flags);
346         as = async_getcompleted(ps);
347         while (as) {
348                 free_async(as);
349                 as = async_getcompleted(ps);
350         }
351 }
352
353 static void destroy_async_on_interface(struct dev_state *ps,
354                                        unsigned int ifnum)
355 {
356         struct list_head *p, *q, hitlist;
357         unsigned long flags;
358
359         INIT_LIST_HEAD(&hitlist);
360         spin_lock_irqsave(&ps->lock, flags);
361         list_for_each_safe(p, q, &ps->async_pending)
362                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
363                         list_move_tail(p, &hitlist);
364         spin_unlock_irqrestore(&ps->lock, flags);
365         destroy_async(ps, &hitlist);
366 }
367
368 static inline void destroy_all_async(struct dev_state *ps)
369 {
370         destroy_async(ps, &ps->async_pending);
371 }
372
373 /*
374  * interface claims are made only at the request of user level code,
375  * which can also release them (explicitly or by closing files).
376  * they're also undone when devices disconnect.
377  */
378
379 static int driver_probe(struct usb_interface *intf,
380                         const struct usb_device_id *id)
381 {
382         return -ENODEV;
383 }
384
385 static void driver_disconnect(struct usb_interface *intf)
386 {
387         struct dev_state *ps = usb_get_intfdata(intf);
388         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
389
390         if (!ps)
391                 return;
392
393         /* NOTE:  this relies on usbcore having canceled and completed
394          * all pending I/O requests; 2.6 does that.
395          */
396
397         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
398                 clear_bit(ifnum, &ps->ifclaimed);
399         else
400                 warn("interface number %u out of range", ifnum);
401
402         usb_set_intfdata(intf, NULL);
403
404         /* force async requests to complete */
405         destroy_async_on_interface(ps, ifnum);
406 }
407
408 /* The following routines are merely placeholders.  There is no way
409  * to inform a user task about suspend or resumes.
410  */
411 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
412 {
413         return 0;
414 }
415
416 static int driver_resume(struct usb_interface *intf)
417 {
418         return 0;
419 }
420
421 struct usb_driver usbfs_driver = {
422         .name =         "usbfs",
423         .probe =        driver_probe,
424         .disconnect =   driver_disconnect,
425         .suspend =      driver_suspend,
426         .resume =       driver_resume,
427 };
428
429 static int claimintf(struct dev_state *ps, unsigned int ifnum)
430 {
431         struct usb_device *dev = ps->dev;
432         struct usb_interface *intf;
433         int err;
434
435         if (ifnum >= 8*sizeof(ps->ifclaimed))
436                 return -EINVAL;
437         /* already claimed */
438         if (test_bit(ifnum, &ps->ifclaimed))
439                 return 0;
440
441         intf = usb_ifnum_to_if(dev, ifnum);
442         if (!intf)
443                 err = -ENOENT;
444         else
445                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
446         if (err == 0)
447                 set_bit(ifnum, &ps->ifclaimed);
448         return err;
449 }
450
451 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
452 {
453         struct usb_device *dev;
454         struct usb_interface *intf;
455         int err;
456
457         err = -EINVAL;
458         if (ifnum >= 8*sizeof(ps->ifclaimed))
459                 return err;
460         dev = ps->dev;
461         intf = usb_ifnum_to_if(dev, ifnum);
462         if (!intf)
463                 err = -ENOENT;
464         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
465                 usb_driver_release_interface(&usbfs_driver, intf);
466                 err = 0;
467         }
468         return err;
469 }
470
471 static int checkintf(struct dev_state *ps, unsigned int ifnum)
472 {
473         if (ps->dev->state != USB_STATE_CONFIGURED)
474                 return -EHOSTUNREACH;
475         if (ifnum >= 8*sizeof(ps->ifclaimed))
476                 return -EINVAL;
477         if (test_bit(ifnum, &ps->ifclaimed))
478                 return 0;
479         /* if not yet claimed, claim it for the driver */
480         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
481                  "interface %u before use\n", task_pid_nr(current),
482                  current->comm, ifnum);
483         return claimintf(ps, ifnum);
484 }
485
486 static int findintfep(struct usb_device *dev, unsigned int ep)
487 {
488         unsigned int i, j, e;
489         struct usb_interface *intf;
490         struct usb_host_interface *alts;
491         struct usb_endpoint_descriptor *endpt;
492
493         if (ep & ~(USB_DIR_IN|0xf))
494                 return -EINVAL;
495         if (!dev->actconfig)
496                 return -ESRCH;
497         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
498                 intf = dev->actconfig->interface[i];
499                 for (j = 0; j < intf->num_altsetting; j++) {
500                         alts = &intf->altsetting[j];
501                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
502                                 endpt = &alts->endpoint[e].desc;
503                                 if (endpt->bEndpointAddress == ep)
504                                         return alts->desc.bInterfaceNumber;
505                         }
506                 }
507         }
508         return -ENOENT;
509 }
510
511 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
512                            unsigned int index)
513 {
514         int ret = 0;
515
516         if (ps->dev->state != USB_STATE_ADDRESS
517          && ps->dev->state != USB_STATE_CONFIGURED)
518                 return -EHOSTUNREACH;
519         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
520                 return 0;
521
522         index &= 0xff;
523         switch (requesttype & USB_RECIP_MASK) {
524         case USB_RECIP_ENDPOINT:
525                 ret = findintfep(ps->dev, index);
526                 if (ret >= 0)
527                         ret = checkintf(ps, ret);
528                 break;
529
530         case USB_RECIP_INTERFACE:
531                 ret = checkintf(ps, index);
532                 break;
533         }
534         return ret;
535 }
536
537 static int __match_minor(struct device *dev, void *data)
538 {
539         int minor = *((int *)data);
540
541         if (dev->devt == MKDEV(USB_DEVICE_MAJOR, minor))
542                 return 1;
543         return 0;
544 }
545
546 static struct usb_device *usbdev_lookup_by_minor(int minor)
547 {
548         struct device *dev;
549
550         dev = bus_find_device(&usb_bus_type, NULL, &minor, __match_minor);
551         if (!dev)
552                 return NULL;
553         put_device(dev);
554         return container_of(dev, struct usb_device, dev);
555 }
556
557 /*
558  * file operations
559  */
560 static int usbdev_open(struct inode *inode, struct file *file)
561 {
562         struct usb_device *dev = NULL;
563         struct dev_state *ps;
564         int ret;
565
566         lock_kernel();
567         /* Protect against simultaneous removal or release */
568         mutex_lock(&usbfs_mutex);
569
570         ret = -ENOMEM;
571         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
572         if (!ps)
573                 goto out;
574
575         ret = -ENOENT;
576         /* usbdev device-node */
577         if (imajor(inode) == USB_DEVICE_MAJOR)
578                 dev = usbdev_lookup_by_minor(iminor(inode));
579 #ifdef CONFIG_USB_DEVICEFS
580         /* procfs file */
581         if (!dev)
582                 dev = inode->i_private;
583 #endif
584         if (!dev)
585                 goto out;
586         ret = usb_autoresume_device(dev);
587         if (ret)
588                 goto out;
589
590         usb_get_dev(dev);
591         ret = 0;
592         ps->dev = dev;
593         ps->file = file;
594         spin_lock_init(&ps->lock);
595         INIT_LIST_HEAD(&ps->list);
596         INIT_LIST_HEAD(&ps->async_pending);
597         INIT_LIST_HEAD(&ps->async_completed);
598         init_waitqueue_head(&ps->wait);
599         ps->discsignr = 0;
600         ps->disc_pid = get_pid(task_pid(current));
601         ps->disc_uid = current->uid;
602         ps->disc_euid = current->euid;
603         ps->disccontext = NULL;
604         ps->ifclaimed = 0;
605         security_task_getsecid(current, &ps->secid);
606         smp_wmb();
607         list_add_tail(&ps->list, &dev->filelist);
608         file->private_data = ps;
609  out:
610         if (ret)
611                 kfree(ps);
612         mutex_unlock(&usbfs_mutex);
613         unlock_kernel();
614         return ret;
615 }
616
617 static int usbdev_release(struct inode *inode, struct file *file)
618 {
619         struct dev_state *ps = file->private_data;
620         struct usb_device *dev = ps->dev;
621         unsigned int ifnum;
622
623         usb_lock_device(dev);
624
625         /* Protect against simultaneous open */
626         mutex_lock(&usbfs_mutex);
627         list_del_init(&ps->list);
628         mutex_unlock(&usbfs_mutex);
629
630         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
631                         ifnum++) {
632                 if (test_bit(ifnum, &ps->ifclaimed))
633                         releaseintf(ps, ifnum);
634         }
635         destroy_all_async(ps);
636         usb_autosuspend_device(dev);
637         usb_unlock_device(dev);
638         usb_put_dev(dev);
639         put_pid(ps->disc_pid);
640         kfree(ps);
641         return 0;
642 }
643
644 static int proc_control(struct dev_state *ps, void __user *arg)
645 {
646         struct usb_device *dev = ps->dev;
647         struct usbdevfs_ctrltransfer ctrl;
648         unsigned int tmo;
649         unsigned char *tbuf;
650         unsigned wLength;
651         int i, j, ret;
652
653         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
654                 return -EFAULT;
655         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
656         if (ret)
657                 return ret;
658         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
659         if (wLength > PAGE_SIZE)
660                 return -EINVAL;
661         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
662         if (!tbuf)
663                 return -ENOMEM;
664         tmo = ctrl.timeout;
665         if (ctrl.bRequestType & 0x80) {
666                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
667                                                ctrl.wLength)) {
668                         free_page((unsigned long)tbuf);
669                         return -EINVAL;
670                 }
671                 snoop(&dev->dev, "control read: bRequest=%02x "
672                                 "bRrequestType=%02x wValue=%04x "
673                                 "wIndex=%04x wLength=%04x\n",
674                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
675                                 ctrl.wIndex, ctrl.wLength);
676
677                 usb_unlock_device(dev);
678                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest,
679                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
680                                     tbuf, ctrl.wLength, tmo);
681                 usb_lock_device(dev);
682                 if ((i > 0) && ctrl.wLength) {
683                         if (usbfs_snoop) {
684                                 dev_info(&dev->dev, "control read: data ");
685                                 for (j = 0; j < i; ++j)
686                                         printk("%02x ", (u8)(tbuf)[j]);
687                                 printk("\n");
688                         }
689                         if (copy_to_user(ctrl.data, tbuf, i)) {
690                                 free_page((unsigned long)tbuf);
691                                 return -EFAULT;
692                         }
693                 }
694         } else {
695                 if (ctrl.wLength) {
696                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
697                                 free_page((unsigned long)tbuf);
698                                 return -EFAULT;
699                         }
700                 }
701                 snoop(&dev->dev, "control write: bRequest=%02x "
702                                 "bRrequestType=%02x wValue=%04x "
703                                 "wIndex=%04x wLength=%04x\n",
704                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
705                                 ctrl.wIndex, ctrl.wLength);
706                 if (usbfs_snoop) {
707                         dev_info(&dev->dev, "control write: data: ");
708                         for (j = 0; j < ctrl.wLength; ++j)
709                                 printk("%02x ", (unsigned char)(tbuf)[j]);
710                         printk("\n");
711                 }
712                 usb_unlock_device(dev);
713                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
714                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
715                                     tbuf, ctrl.wLength, tmo);
716                 usb_lock_device(dev);
717         }
718         free_page((unsigned long)tbuf);
719         if (i < 0 && i != -EPIPE) {
720                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
721                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
722                            current->comm, ctrl.bRequestType, ctrl.bRequest,
723                            ctrl.wLength, i);
724         }
725         return i;
726 }
727
728 static int proc_bulk(struct dev_state *ps, void __user *arg)
729 {
730         struct usb_device *dev = ps->dev;
731         struct usbdevfs_bulktransfer bulk;
732         unsigned int tmo, len1, pipe;
733         int len2;
734         unsigned char *tbuf;
735         int i, j, ret;
736
737         if (copy_from_user(&bulk, arg, sizeof(bulk)))
738                 return -EFAULT;
739         ret = findintfep(ps->dev, bulk.ep);
740         if (ret < 0)
741                 return ret;
742         ret = checkintf(ps, ret);
743         if (ret)
744                 return ret;
745         if (bulk.ep & USB_DIR_IN)
746                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
747         else
748                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
749         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
750                 return -EINVAL;
751         len1 = bulk.len;
752         if (len1 > MAX_USBFS_BUFFER_SIZE)
753                 return -EINVAL;
754         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
755                 return -ENOMEM;
756         tmo = bulk.timeout;
757         if (bulk.ep & 0x80) {
758                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
759                         kfree(tbuf);
760                         return -EINVAL;
761                 }
762                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
763                         bulk.len, bulk.timeout);
764                 usb_unlock_device(dev);
765                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
766                 usb_lock_device(dev);
767                 if (!i && len2) {
768                         if (usbfs_snoop) {
769                                 dev_info(&dev->dev, "bulk read: data ");
770                                 for (j = 0; j < len2; ++j)
771                                         printk("%02x ", (u8)(tbuf)[j]);
772                                 printk("\n");
773                         }
774                         if (copy_to_user(bulk.data, tbuf, len2)) {
775                                 kfree(tbuf);
776                                 return -EFAULT;
777                         }
778                 }
779         } else {
780                 if (len1) {
781                         if (copy_from_user(tbuf, bulk.data, len1)) {
782                                 kfree(tbuf);
783                                 return -EFAULT;
784                         }
785                 }
786                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
787                         bulk.len, bulk.timeout);
788                 if (usbfs_snoop) {
789                         dev_info(&dev->dev, "bulk write: data: ");
790                         for (j = 0; j < len1; ++j)
791                                 printk("%02x ", (unsigned char)(tbuf)[j]);
792                         printk("\n");
793                 }
794                 usb_unlock_device(dev);
795                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
796                 usb_lock_device(dev);
797         }
798         kfree(tbuf);
799         if (i < 0)
800                 return i;
801         return len2;
802 }
803
804 static int proc_resetep(struct dev_state *ps, void __user *arg)
805 {
806         unsigned int ep;
807         int ret;
808
809         if (get_user(ep, (unsigned int __user *)arg))
810                 return -EFAULT;
811         ret = findintfep(ps->dev, ep);
812         if (ret < 0)
813                 return ret;
814         ret = checkintf(ps, ret);
815         if (ret)
816                 return ret;
817         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
818         return 0;
819 }
820
821 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
822 {
823         unsigned int ep;
824         int pipe;
825         int ret;
826
827         if (get_user(ep, (unsigned int __user *)arg))
828                 return -EFAULT;
829         ret = findintfep(ps->dev, ep);
830         if (ret < 0)
831                 return ret;
832         ret = checkintf(ps, ret);
833         if (ret)
834                 return ret;
835         if (ep & USB_DIR_IN)
836                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
837         else
838                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
839
840         return usb_clear_halt(ps->dev, pipe);
841 }
842
843 static int proc_getdriver(struct dev_state *ps, void __user *arg)
844 {
845         struct usbdevfs_getdriver gd;
846         struct usb_interface *intf;
847         int ret;
848
849         if (copy_from_user(&gd, arg, sizeof(gd)))
850                 return -EFAULT;
851         intf = usb_ifnum_to_if(ps->dev, gd.interface);
852         if (!intf || !intf->dev.driver)
853                 ret = -ENODATA;
854         else {
855                 strncpy(gd.driver, intf->dev.driver->name,
856                                 sizeof(gd.driver));
857                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
858         }
859         return ret;
860 }
861
862 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
863 {
864         struct usbdevfs_connectinfo ci;
865
866         ci.devnum = ps->dev->devnum;
867         ci.slow = ps->dev->speed == USB_SPEED_LOW;
868         if (copy_to_user(arg, &ci, sizeof(ci)))
869                 return -EFAULT;
870         return 0;
871 }
872
873 static int proc_resetdevice(struct dev_state *ps)
874 {
875         return usb_reset_composite_device(ps->dev, NULL);
876 }
877
878 static int proc_setintf(struct dev_state *ps, void __user *arg)
879 {
880         struct usbdevfs_setinterface setintf;
881         int ret;
882
883         if (copy_from_user(&setintf, arg, sizeof(setintf)))
884                 return -EFAULT;
885         if ((ret = checkintf(ps, setintf.interface)))
886                 return ret;
887         return usb_set_interface(ps->dev, setintf.interface,
888                         setintf.altsetting);
889 }
890
891 static int proc_setconfig(struct dev_state *ps, void __user *arg)
892 {
893         int u;
894         int status = 0;
895         struct usb_host_config *actconfig;
896
897         if (get_user(u, (int __user *)arg))
898                 return -EFAULT;
899
900         actconfig = ps->dev->actconfig;
901
902         /* Don't touch the device if any interfaces are claimed.
903          * It could interfere with other drivers' operations, and if
904          * an interface is claimed by usbfs it could easily deadlock.
905          */
906         if (actconfig) {
907                 int i;
908
909                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
910                         if (usb_interface_claimed(actconfig->interface[i])) {
911                                 dev_warn(&ps->dev->dev,
912                                         "usbfs: interface %d claimed by %s "
913                                         "while '%s' sets config #%d\n",
914                                         actconfig->interface[i]
915                                                 ->cur_altsetting
916                                                 ->desc.bInterfaceNumber,
917                                         actconfig->interface[i]
918                                                 ->dev.driver->name,
919                                         current->comm, u);
920                                 status = -EBUSY;
921                                 break;
922                         }
923                 }
924         }
925
926         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
927          * so avoid usb_set_configuration()'s kick to sysfs
928          */
929         if (status == 0) {
930                 if (actconfig && actconfig->desc.bConfigurationValue == u)
931                         status = usb_reset_configuration(ps->dev);
932                 else
933                         status = usb_set_configuration(ps->dev, u);
934         }
935
936         return status;
937 }
938
939 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
940                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
941                         void __user *arg)
942 {
943         struct usbdevfs_iso_packet_desc *isopkt = NULL;
944         struct usb_host_endpoint *ep;
945         struct async *as;
946         struct usb_ctrlrequest *dr = NULL;
947         unsigned int u, totlen, isofrmlen;
948         int ret, ifnum = -1;
949         int is_in;
950
951         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
952                                 USBDEVFS_URB_SHORT_NOT_OK |
953                                 USBDEVFS_URB_NO_FSBR |
954                                 USBDEVFS_URB_ZERO_PACKET |
955                                 USBDEVFS_URB_NO_INTERRUPT))
956                 return -EINVAL;
957         if (!uurb->buffer)
958                 return -EINVAL;
959         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN ||
960                                  uurb->signr > SIGRTMAX))
961                 return -EINVAL;
962         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
963             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
964                 ifnum = findintfep(ps->dev, uurb->endpoint);
965                 if (ifnum < 0)
966                         return ifnum;
967                 ret = checkintf(ps, ifnum);
968                 if (ret)
969                         return ret;
970         }
971         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
972                 is_in = 1;
973                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
974         } else {
975                 is_in = 0;
976                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
977         }
978         if (!ep)
979                 return -ENOENT;
980         switch(uurb->type) {
981         case USBDEVFS_URB_TYPE_CONTROL:
982                 if (!usb_endpoint_xfer_control(&ep->desc))
983                         return -EINVAL;
984                 /* min 8 byte setup packet,
985                  * max 8 byte setup plus an arbitrary data stage */
986                 if (uurb->buffer_length < 8 ||
987                     uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
988                         return -EINVAL;
989                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
990                 if (!dr)
991                         return -ENOMEM;
992                 if (copy_from_user(dr, uurb->buffer, 8)) {
993                         kfree(dr);
994                         return -EFAULT;
995                 }
996                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
997                         kfree(dr);
998                         return -EINVAL;
999                 }
1000                 ret = check_ctrlrecip(ps, dr->bRequestType,
1001                                       le16_to_cpup(&dr->wIndex));
1002                 if (ret) {
1003                         kfree(dr);
1004                         return ret;
1005                 }
1006                 uurb->number_of_packets = 0;
1007                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1008                 uurb->buffer += 8;
1009                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1010                         is_in = 1;
1011                         uurb->endpoint |= USB_DIR_IN;
1012                 } else {
1013                         is_in = 0;
1014                         uurb->endpoint &= ~USB_DIR_IN;
1015                 }
1016                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1017                                 uurb->buffer, uurb->buffer_length)) {
1018                         kfree(dr);
1019                         return -EFAULT;
1020                 }
1021                 snoop(&ps->dev->dev, "control urb: bRequest=%02x "
1022                         "bRrequestType=%02x wValue=%04x "
1023                         "wIndex=%04x wLength=%04x\n",
1024                         dr->bRequest, dr->bRequestType,
1025                         __le16_to_cpup(&dr->wValue),
1026                         __le16_to_cpup(&dr->wIndex),
1027                         __le16_to_cpup(&dr->wLength));
1028                 break;
1029
1030         case USBDEVFS_URB_TYPE_BULK:
1031                 switch (usb_endpoint_type(&ep->desc)) {
1032                 case USB_ENDPOINT_XFER_CONTROL:
1033                 case USB_ENDPOINT_XFER_ISOC:
1034                         return -EINVAL;
1035                 /* allow single-shot interrupt transfers, at bogus rates */
1036                 }
1037                 uurb->number_of_packets = 0;
1038                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1039                         return -EINVAL;
1040                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1041                                 uurb->buffer, uurb->buffer_length))
1042                         return -EFAULT;
1043                 snoop(&ps->dev->dev, "bulk urb\n");
1044                 break;
1045
1046         case USBDEVFS_URB_TYPE_ISO:
1047                 /* arbitrary limit */
1048                 if (uurb->number_of_packets < 1 ||
1049                     uurb->number_of_packets > 128)
1050                         return -EINVAL;
1051                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1052                         return -EINVAL;
1053                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1054                                    uurb->number_of_packets;
1055                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1056                         return -ENOMEM;
1057                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1058                         kfree(isopkt);
1059                         return -EFAULT;
1060                 }
1061                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1062                         /* arbitrary limit,
1063                          * sufficient for USB 2.0 high-bandwidth iso */
1064                         if (isopkt[u].length > 8192) {
1065                                 kfree(isopkt);
1066                                 return -EINVAL;
1067                         }
1068                         totlen += isopkt[u].length;
1069                 }
1070                 if (totlen > 32768) {
1071                         kfree(isopkt);
1072                         return -EINVAL;
1073                 }
1074                 uurb->buffer_length = totlen;
1075                 snoop(&ps->dev->dev, "iso urb\n");
1076                 break;
1077
1078         case USBDEVFS_URB_TYPE_INTERRUPT:
1079                 uurb->number_of_packets = 0;
1080                 if (!usb_endpoint_xfer_int(&ep->desc))
1081                         return -EINVAL;
1082                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1083                         return -EINVAL;
1084                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1085                                 uurb->buffer, uurb->buffer_length))
1086                         return -EFAULT;
1087                 snoop(&ps->dev->dev, "interrupt urb\n");
1088                 break;
1089
1090         default:
1091                 return -EINVAL;
1092         }
1093         as = alloc_async(uurb->number_of_packets);
1094         if (!as) {
1095                 kfree(isopkt);
1096                 kfree(dr);
1097                 return -ENOMEM;
1098         }
1099         as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL);
1100         if (!as->urb->transfer_buffer) {
1101                 kfree(isopkt);
1102                 kfree(dr);
1103                 free_async(as);
1104                 return -ENOMEM;
1105         }
1106         as->urb->dev = ps->dev;
1107         as->urb->pipe = (uurb->type << 30) |
1108                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1109                         (uurb->endpoint & USB_DIR_IN);
1110
1111         /* This tedious sequence is necessary because the URB_* flags
1112          * are internal to the kernel and subject to change, whereas
1113          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1114          */
1115         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1116         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1117                 u |= URB_ISO_ASAP;
1118         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1119                 u |= URB_SHORT_NOT_OK;
1120         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1121                 u |= URB_NO_FSBR;
1122         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1123                 u |= URB_ZERO_PACKET;
1124         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1125                 u |= URB_NO_INTERRUPT;
1126         as->urb->transfer_flags = u;
1127
1128         as->urb->transfer_buffer_length = uurb->buffer_length;
1129         as->urb->setup_packet = (unsigned char *)dr;
1130         as->urb->start_frame = uurb->start_frame;
1131         as->urb->number_of_packets = uurb->number_of_packets;
1132         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1133                         ps->dev->speed == USB_SPEED_HIGH)
1134                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1135         else
1136                 as->urb->interval = ep->desc.bInterval;
1137         as->urb->context = as;
1138         as->urb->complete = async_completed;
1139         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1140                 as->urb->iso_frame_desc[u].offset = totlen;
1141                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1142                 totlen += isopkt[u].length;
1143         }
1144         kfree(isopkt);
1145         as->ps = ps;
1146         as->userurb = arg;
1147         if (uurb->endpoint & USB_DIR_IN)
1148                 as->userbuffer = uurb->buffer;
1149         else
1150                 as->userbuffer = NULL;
1151         as->signr = uurb->signr;
1152         as->ifnum = ifnum;
1153         as->pid = get_pid(task_pid(current));
1154         as->uid = current->uid;
1155         as->euid = current->euid;
1156         security_task_getsecid(current, &as->secid);
1157         if (!is_in) {
1158                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1159                                 as->urb->transfer_buffer_length)) {
1160                         free_async(as);
1161                         return -EFAULT;
1162                 }
1163         }
1164         snoop_urb(as->urb, as->userurb);
1165         async_newpending(as);
1166         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1167                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1168                            "usbfs: usb_submit_urb returned %d\n", ret);
1169                 async_removepending(as);
1170                 free_async(as);
1171                 return ret;
1172         }
1173         return 0;
1174 }
1175
1176 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1177 {
1178         struct usbdevfs_urb uurb;
1179
1180         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1181                 return -EFAULT;
1182
1183         return proc_do_submiturb(ps, &uurb,
1184                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1185                         arg);
1186 }
1187
1188 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1189 {
1190         struct async *as;
1191
1192         as = async_getpending(ps, arg);
1193         if (!as)
1194                 return -EINVAL;
1195         usb_kill_urb(as->urb);
1196         return 0;
1197 }
1198
1199 static int processcompl(struct async *as, void __user * __user *arg)
1200 {
1201         struct urb *urb = as->urb;
1202         struct usbdevfs_urb __user *userurb = as->userurb;
1203         void __user *addr = as->userurb;
1204         unsigned int i;
1205
1206         if (as->userbuffer)
1207                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1208                                  urb->transfer_buffer_length))
1209                         return -EFAULT;
1210         if (put_user(as->status, &userurb->status))
1211                 return -EFAULT;
1212         if (put_user(urb->actual_length, &userurb->actual_length))
1213                 return -EFAULT;
1214         if (put_user(urb->error_count, &userurb->error_count))
1215                 return -EFAULT;
1216
1217         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1218                 for (i = 0; i < urb->number_of_packets; i++) {
1219                         if (put_user(urb->iso_frame_desc[i].actual_length,
1220                                      &userurb->iso_frame_desc[i].actual_length))
1221                                 return -EFAULT;
1222                         if (put_user(urb->iso_frame_desc[i].status,
1223                                      &userurb->iso_frame_desc[i].status))
1224                                 return -EFAULT;
1225                 }
1226         }
1227
1228         free_async(as);
1229
1230         if (put_user(addr, (void __user * __user *)arg))
1231                 return -EFAULT;
1232         return 0;
1233 }
1234
1235 static struct async *reap_as(struct dev_state *ps)
1236 {
1237         DECLARE_WAITQUEUE(wait, current);
1238         struct async *as = NULL;
1239         struct usb_device *dev = ps->dev;
1240
1241         add_wait_queue(&ps->wait, &wait);
1242         for (;;) {
1243                 __set_current_state(TASK_INTERRUPTIBLE);
1244                 as = async_getcompleted(ps);
1245                 if (as)
1246                         break;
1247                 if (signal_pending(current))
1248                         break;
1249                 usb_unlock_device(dev);
1250                 schedule();
1251                 usb_lock_device(dev);
1252         }
1253         remove_wait_queue(&ps->wait, &wait);
1254         set_current_state(TASK_RUNNING);
1255         return as;
1256 }
1257
1258 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1259 {
1260         struct async *as = reap_as(ps);
1261         if (as)
1262                 return processcompl(as, (void __user * __user *)arg);
1263         if (signal_pending(current))
1264                 return -EINTR;
1265         return -EIO;
1266 }
1267
1268 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1269 {
1270         struct async *as;
1271
1272         if (!(as = async_getcompleted(ps)))
1273                 return -EAGAIN;
1274         return processcompl(as, (void __user * __user *)arg);
1275 }
1276
1277 #ifdef CONFIG_COMPAT
1278
1279 static int get_urb32(struct usbdevfs_urb *kurb,
1280                      struct usbdevfs_urb32 __user *uurb)
1281 {
1282         __u32  uptr;
1283         if (get_user(kurb->type, &uurb->type) ||
1284             __get_user(kurb->endpoint, &uurb->endpoint) ||
1285             __get_user(kurb->status, &uurb->status) ||
1286             __get_user(kurb->flags, &uurb->flags) ||
1287             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1288             __get_user(kurb->actual_length, &uurb->actual_length) ||
1289             __get_user(kurb->start_frame, &uurb->start_frame) ||
1290             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1291             __get_user(kurb->error_count, &uurb->error_count) ||
1292             __get_user(kurb->signr, &uurb->signr))
1293                 return -EFAULT;
1294
1295         if (__get_user(uptr, &uurb->buffer))
1296                 return -EFAULT;
1297         kurb->buffer = compat_ptr(uptr);
1298         if (__get_user(uptr, &uurb->buffer))
1299                 return -EFAULT;
1300         kurb->usercontext = compat_ptr(uptr);
1301
1302         return 0;
1303 }
1304
1305 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1306 {
1307         struct usbdevfs_urb uurb;
1308
1309         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1310                 return -EFAULT;
1311
1312         return proc_do_submiturb(ps, &uurb,
1313                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1314                         arg);
1315 }
1316
1317 static int processcompl_compat(struct async *as, void __user * __user *arg)
1318 {
1319         struct urb *urb = as->urb;
1320         struct usbdevfs_urb32 __user *userurb = as->userurb;
1321         void __user *addr = as->userurb;
1322         unsigned int i;
1323
1324         if (as->userbuffer)
1325                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1326                                  urb->transfer_buffer_length))
1327                         return -EFAULT;
1328         if (put_user(as->status, &userurb->status))
1329                 return -EFAULT;
1330         if (put_user(urb->actual_length, &userurb->actual_length))
1331                 return -EFAULT;
1332         if (put_user(urb->error_count, &userurb->error_count))
1333                 return -EFAULT;
1334
1335         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1336                 for (i = 0; i < urb->number_of_packets; i++) {
1337                         if (put_user(urb->iso_frame_desc[i].actual_length,
1338                                      &userurb->iso_frame_desc[i].actual_length))
1339                                 return -EFAULT;
1340                         if (put_user(urb->iso_frame_desc[i].status,
1341                                      &userurb->iso_frame_desc[i].status))
1342                                 return -EFAULT;
1343                 }
1344         }
1345
1346         free_async(as);
1347         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1348                 return -EFAULT;
1349         return 0;
1350 }
1351
1352 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1353 {
1354         struct async *as = reap_as(ps);
1355         if (as)
1356                 return processcompl_compat(as, (void __user * __user *)arg);
1357         if (signal_pending(current))
1358                 return -EINTR;
1359         return -EIO;
1360 }
1361
1362 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1363 {
1364         struct async *as;
1365
1366         if (!(as = async_getcompleted(ps)))
1367                 return -EAGAIN;
1368         return processcompl_compat(as, (void __user * __user *)arg);
1369 }
1370
1371 #endif
1372
1373 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1374 {
1375         struct usbdevfs_disconnectsignal ds;
1376
1377         if (copy_from_user(&ds, arg, sizeof(ds)))
1378                 return -EFAULT;
1379         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1380                 return -EINVAL;
1381         ps->discsignr = ds.signr;
1382         ps->disccontext = ds.context;
1383         return 0;
1384 }
1385
1386 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1387 {
1388         unsigned int ifnum;
1389
1390         if (get_user(ifnum, (unsigned int __user *)arg))
1391                 return -EFAULT;
1392         return claimintf(ps, ifnum);
1393 }
1394
1395 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1396 {
1397         unsigned int ifnum;
1398         int ret;
1399
1400         if (get_user(ifnum, (unsigned int __user *)arg))
1401                 return -EFAULT;
1402         if ((ret = releaseintf(ps, ifnum)) < 0)
1403                 return ret;
1404         destroy_async_on_interface (ps, ifnum);
1405         return 0;
1406 }
1407
1408 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1409 {
1410         int                     size;
1411         void                    *buf = NULL;
1412         int                     retval = 0;
1413         struct usb_interface    *intf = NULL;
1414         struct usb_driver       *driver = NULL;
1415
1416         /* alloc buffer */
1417         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1418                 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1419                         return -ENOMEM;
1420                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1421                         if (copy_from_user(buf, ctl->data, size)) {
1422                                 kfree(buf);
1423                                 return -EFAULT;
1424                         }
1425                 } else {
1426                         memset(buf, 0, size);
1427                 }
1428         }
1429
1430         if (!connected(ps)) {
1431                 kfree(buf);
1432                 return -ENODEV;
1433         }
1434
1435         if (ps->dev->state != USB_STATE_CONFIGURED)
1436                 retval = -EHOSTUNREACH;
1437         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1438                 retval = -EINVAL;
1439         else switch (ctl->ioctl_code) {
1440
1441         /* disconnect kernel driver from interface */
1442         case USBDEVFS_DISCONNECT:
1443                 if (intf->dev.driver) {
1444                         driver = to_usb_driver(intf->dev.driver);
1445                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1446                         usb_driver_release_interface(driver, intf);
1447                 } else
1448                         retval = -ENODATA;
1449                 break;
1450
1451         /* let kernel drivers try to (re)bind to the interface */
1452         case USBDEVFS_CONNECT:
1453                 if (!intf->dev.driver)
1454                         retval = device_attach(&intf->dev);
1455                 else
1456                         retval = -EBUSY;
1457                 break;
1458
1459         /* talk directly to the interface's driver */
1460         default:
1461                 if (intf->dev.driver)
1462                         driver = to_usb_driver(intf->dev.driver);
1463                 if (driver == NULL || driver->ioctl == NULL) {
1464                         retval = -ENOTTY;
1465                 } else {
1466                         retval = driver->ioctl(intf, ctl->ioctl_code, buf);
1467                         if (retval == -ENOIOCTLCMD)
1468                                 retval = -ENOTTY;
1469                 }
1470         }
1471
1472         /* cleanup and return */
1473         if (retval >= 0
1474                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1475                         && size > 0
1476                         && copy_to_user(ctl->data, buf, size) != 0)
1477                 retval = -EFAULT;
1478
1479         kfree(buf);
1480         return retval;
1481 }
1482
1483 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1484 {
1485         struct usbdevfs_ioctl   ctrl;
1486
1487         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1488                 return -EFAULT;
1489         return proc_ioctl(ps, &ctrl);
1490 }
1491
1492 #ifdef CONFIG_COMPAT
1493 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1494 {
1495         struct usbdevfs_ioctl32 __user *uioc;
1496         struct usbdevfs_ioctl ctrl;
1497         u32 udata;
1498
1499         uioc = compat_ptr((long)arg);
1500         if (get_user(ctrl.ifno, &uioc->ifno) ||
1501             get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1502             __get_user(udata, &uioc->data))
1503                 return -EFAULT;
1504         ctrl.data = compat_ptr(udata);
1505
1506         return proc_ioctl(ps, &ctrl);
1507 }
1508 #endif
1509
1510 /*
1511  * NOTE:  All requests here that have interface numbers as parameters
1512  * are assuming that somehow the configuration has been prevented from
1513  * changing.  But there's no mechanism to ensure that...
1514  */
1515 static int usbdev_ioctl(struct inode *inode, struct file *file,
1516                         unsigned int cmd, unsigned long arg)
1517 {
1518         struct dev_state *ps = file->private_data;
1519         struct usb_device *dev = ps->dev;
1520         void __user *p = (void __user *)arg;
1521         int ret = -ENOTTY;
1522
1523         if (!(file->f_mode & FMODE_WRITE))
1524                 return -EPERM;
1525         usb_lock_device(dev);
1526         if (!connected(ps)) {
1527                 usb_unlock_device(dev);
1528                 return -ENODEV;
1529         }
1530
1531         switch (cmd) {
1532         case USBDEVFS_CONTROL:
1533                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1534                 ret = proc_control(ps, p);
1535                 if (ret >= 0)
1536                         inode->i_mtime = CURRENT_TIME;
1537                 break;
1538
1539         case USBDEVFS_BULK:
1540                 snoop(&dev->dev, "%s: BULK\n", __func__);
1541                 ret = proc_bulk(ps, p);
1542                 if (ret >= 0)
1543                         inode->i_mtime = CURRENT_TIME;
1544                 break;
1545
1546         case USBDEVFS_RESETEP:
1547                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1548                 ret = proc_resetep(ps, p);
1549                 if (ret >= 0)
1550                         inode->i_mtime = CURRENT_TIME;
1551                 break;
1552
1553         case USBDEVFS_RESET:
1554                 snoop(&dev->dev, "%s: RESET\n", __func__);
1555                 ret = proc_resetdevice(ps);
1556                 break;
1557
1558         case USBDEVFS_CLEAR_HALT:
1559                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1560                 ret = proc_clearhalt(ps, p);
1561                 if (ret >= 0)
1562                         inode->i_mtime = CURRENT_TIME;
1563                 break;
1564
1565         case USBDEVFS_GETDRIVER:
1566                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1567                 ret = proc_getdriver(ps, p);
1568                 break;
1569
1570         case USBDEVFS_CONNECTINFO:
1571                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1572                 ret = proc_connectinfo(ps, p);
1573                 break;
1574
1575         case USBDEVFS_SETINTERFACE:
1576                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1577                 ret = proc_setintf(ps, p);
1578                 break;
1579
1580         case USBDEVFS_SETCONFIGURATION:
1581                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1582                 ret = proc_setconfig(ps, p);
1583                 break;
1584
1585         case USBDEVFS_SUBMITURB:
1586                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1587                 ret = proc_submiturb(ps, p);
1588                 if (ret >= 0)
1589                         inode->i_mtime = CURRENT_TIME;
1590                 break;
1591
1592 #ifdef CONFIG_COMPAT
1593
1594         case USBDEVFS_SUBMITURB32:
1595                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1596                 ret = proc_submiturb_compat(ps, p);
1597                 if (ret >= 0)
1598                         inode->i_mtime = CURRENT_TIME;
1599                 break;
1600
1601         case USBDEVFS_REAPURB32:
1602                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1603                 ret = proc_reapurb_compat(ps, p);
1604                 break;
1605
1606         case USBDEVFS_REAPURBNDELAY32:
1607                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __func__);
1608                 ret = proc_reapurbnonblock_compat(ps, p);
1609                 break;
1610
1611         case USBDEVFS_IOCTL32:
1612                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1613                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1614                 break;
1615 #endif
1616
1617         case USBDEVFS_DISCARDURB:
1618                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1619                 ret = proc_unlinkurb(ps, p);
1620                 break;
1621
1622         case USBDEVFS_REAPURB:
1623                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1624                 ret = proc_reapurb(ps, p);
1625                 break;
1626
1627         case USBDEVFS_REAPURBNDELAY:
1628                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __func__);
1629                 ret = proc_reapurbnonblock(ps, p);
1630                 break;
1631
1632         case USBDEVFS_DISCSIGNAL:
1633                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1634                 ret = proc_disconnectsignal(ps, p);
1635                 break;
1636
1637         case USBDEVFS_CLAIMINTERFACE:
1638                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1639                 ret = proc_claiminterface(ps, p);
1640                 break;
1641
1642         case USBDEVFS_RELEASEINTERFACE:
1643                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1644                 ret = proc_releaseinterface(ps, p);
1645                 break;
1646
1647         case USBDEVFS_IOCTL:
1648                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1649                 ret = proc_ioctl_default(ps, p);
1650                 break;
1651         }
1652         usb_unlock_device(dev);
1653         if (ret >= 0)
1654                 inode->i_atime = CURRENT_TIME;
1655         return ret;
1656 }
1657
1658 /* No kernel lock - fine */
1659 static unsigned int usbdev_poll(struct file *file,
1660                                 struct poll_table_struct *wait)
1661 {
1662         struct dev_state *ps = file->private_data;
1663         unsigned int mask = 0;
1664
1665         poll_wait(file, &ps->wait, wait);
1666         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1667                 mask |= POLLOUT | POLLWRNORM;
1668         if (!connected(ps))
1669                 mask |= POLLERR | POLLHUP;
1670         return mask;
1671 }
1672
1673 const struct file_operations usbdev_file_operations = {
1674         .owner =        THIS_MODULE,
1675         .llseek =       usbdev_lseek,
1676         .read =         usbdev_read,
1677         .poll =         usbdev_poll,
1678         .ioctl =        usbdev_ioctl,
1679         .open =         usbdev_open,
1680         .release =      usbdev_release,
1681 };
1682
1683 #ifdef CONFIG_USB_DEVICE_CLASS
1684 static struct class *usb_classdev_class;
1685
1686 static int usb_classdev_add(struct usb_device *dev)
1687 {
1688         int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1689
1690         dev->usb_classdev = device_create(usb_classdev_class, &dev->dev,
1691                                 MKDEV(USB_DEVICE_MAJOR, minor),
1692                                 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1693         if (IS_ERR(dev->usb_classdev))
1694                 return PTR_ERR(dev->usb_classdev);
1695
1696         return 0;
1697 }
1698
1699 static void usb_classdev_remove(struct usb_device *dev)
1700 {
1701         device_unregister(dev->usb_classdev);
1702 }
1703
1704 static int usb_classdev_notify(struct notifier_block *self,
1705                                unsigned long action, void *dev)
1706 {
1707         switch (action) {
1708         case USB_DEVICE_ADD:
1709                 if (usb_classdev_add(dev))
1710                         return NOTIFY_BAD;
1711                 break;
1712         case USB_DEVICE_REMOVE:
1713                 usb_classdev_remove(dev);
1714                 break;
1715         }
1716         return NOTIFY_OK;
1717 }
1718
1719 static struct notifier_block usbdev_nb = {
1720         .notifier_call =        usb_classdev_notify,
1721 };
1722 #endif
1723
1724 static struct cdev usb_device_cdev;
1725
1726 int __init usb_devio_init(void)
1727 {
1728         int retval;
1729
1730         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1731                                         "usb_device");
1732         if (retval) {
1733                 err("unable to register minors for usb_device");
1734                 goto out;
1735         }
1736         cdev_init(&usb_device_cdev, &usbdev_file_operations);
1737         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1738         if (retval) {
1739                 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1740                 goto error_cdev;
1741         }
1742 #ifdef CONFIG_USB_DEVICE_CLASS
1743         usb_classdev_class = class_create(THIS_MODULE, "usb_device");
1744         if (IS_ERR(usb_classdev_class)) {
1745                 err("unable to register usb_device class");
1746                 retval = PTR_ERR(usb_classdev_class);
1747                 cdev_del(&usb_device_cdev);
1748                 usb_classdev_class = NULL;
1749                 goto out;
1750         }
1751
1752         usb_register_notify(&usbdev_nb);
1753 #endif
1754 out:
1755         return retval;
1756
1757 error_cdev:
1758         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1759         goto out;
1760 }
1761
1762 void usb_devio_cleanup(void)
1763 {
1764 #ifdef CONFIG_USB_DEVICE_CLASS
1765         usb_unregister_notify(&usbdev_nb);
1766         class_destroy(usb_classdev_class);
1767 #endif
1768         cdev_del(&usb_device_cdev);
1769         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1770 }