]> rtime.felk.cvut.cz Git - can-eth-gw-linux.git/blob - drivers/usb/core/devio.c
Merge tag 'mxs-dt-3.8' of git://git.linaro.org/people/shawnguo/linux-2.6 into next/dt
[can-eth-gw-linux.git] / drivers / usb / core / devio.c
1 /*****************************************************************************/
2
3 /*
4  *      devio.c  --  User space communication with USB devices.
5  *
6  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
7  *
8  *      This program is free software; you can redistribute it and/or modify
9  *      it under the terms of the GNU General Public License as published by
10  *      the Free Software Foundation; either version 2 of the License, or
11  *      (at your option) any later version.
12  *
13  *      This program is distributed in the hope that it will be useful,
14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  *      GNU General Public License for more details.
17  *
18  *      You should have received a copy of the GNU General Public License
19  *      along with this program; if not, write to the Free Software
20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21  *
22  *  This file implements the usbfs/x/y files, where
23  *  x is the bus number and y the device number.
24  *
25  *  It allows user space programs/"drivers" to communicate directly
26  *  with USB devices without intervening kernel driver.
27  *
28  *  Revision history
29  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
30  *    04.01.2000   0.2   Turned into its own filesystem
31  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
32  *                       (CAN-2005-3055)
33  */
34
35 /*****************************************************************************/
36
37 #include <linux/fs.h>
38 #include <linux/mm.h>
39 #include <linux/slab.h>
40 #include <linux/signal.h>
41 #include <linux/poll.h>
42 #include <linux/module.h>
43 #include <linux/usb.h>
44 #include <linux/usbdevice_fs.h>
45 #include <linux/usb/hcd.h>      /* for usbcore internals */
46 #include <linux/cdev.h>
47 #include <linux/notifier.h>
48 #include <linux/security.h>
49 #include <linux/user_namespace.h>
50 #include <linux/scatterlist.h>
51 #include <asm/uaccess.h>
52 #include <asm/byteorder.h>
53 #include <linux/moduleparam.h>
54
55 #include "usb.h"
56
57 #define USB_MAXBUS                      64
58 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
59 #define USB_SG_SIZE                     16384 /* split-size for large txs */
60
61 /* Mutual exclusion for removal, open, and release */
62 DEFINE_MUTEX(usbfs_mutex);
63
64 struct dev_state {
65         struct list_head list;      /* state list */
66         struct usb_device *dev;
67         struct file *file;
68         spinlock_t lock;            /* protects the async urb lists */
69         struct list_head async_pending;
70         struct list_head async_completed;
71         wait_queue_head_t wait;     /* wake up if a request completed */
72         unsigned int discsignr;
73         struct pid *disc_pid;
74         const struct cred *cred;
75         void __user *disccontext;
76         unsigned long ifclaimed;
77         u32 secid;
78         u32 disabled_bulk_eps;
79 };
80
81 struct async {
82         struct list_head asynclist;
83         struct dev_state *ps;
84         struct pid *pid;
85         const struct cred *cred;
86         unsigned int signr;
87         unsigned int ifnum;
88         void __user *userbuffer;
89         void __user *userurb;
90         struct urb *urb;
91         unsigned int mem_usage;
92         int status;
93         u32 secid;
94         u8 bulk_addr;
95         u8 bulk_status;
96 };
97
98 static bool usbfs_snoop;
99 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
100 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
101
102 #define snoop(dev, format, arg...)                              \
103         do {                                                    \
104                 if (usbfs_snoop)                                \
105                         dev_info(dev , format , ## arg);        \
106         } while (0)
107
108 enum snoop_when {
109         SUBMIT, COMPLETE
110 };
111
112 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
113
114 /* Limit on the total amount of memory we can allocate for transfers */
115 static unsigned usbfs_memory_mb = 16;
116 module_param(usbfs_memory_mb, uint, 0644);
117 MODULE_PARM_DESC(usbfs_memory_mb,
118                 "maximum MB allowed for usbfs buffers (0 = no limit)");
119
120 /* Hard limit, necessary to avoid aithmetic overflow */
121 #define USBFS_XFER_MAX          (UINT_MAX / 2 - 1000000)
122
123 static atomic_t usbfs_memory_usage;     /* Total memory currently allocated */
124
125 /* Check whether it's okay to allocate more memory for a transfer */
126 static int usbfs_increase_memory_usage(unsigned amount)
127 {
128         unsigned lim;
129
130         /*
131          * Convert usbfs_memory_mb to bytes, avoiding overflows.
132          * 0 means use the hard limit (effectively unlimited).
133          */
134         lim = ACCESS_ONCE(usbfs_memory_mb);
135         if (lim == 0 || lim > (USBFS_XFER_MAX >> 20))
136                 lim = USBFS_XFER_MAX;
137         else
138                 lim <<= 20;
139
140         atomic_add(amount, &usbfs_memory_usage);
141         if (atomic_read(&usbfs_memory_usage) <= lim)
142                 return 0;
143         atomic_sub(amount, &usbfs_memory_usage);
144         return -ENOMEM;
145 }
146
147 /* Memory for a transfer is being deallocated */
148 static void usbfs_decrease_memory_usage(unsigned amount)
149 {
150         atomic_sub(amount, &usbfs_memory_usage);
151 }
152
153 static int connected(struct dev_state *ps)
154 {
155         return (!list_empty(&ps->list) &&
156                         ps->dev->state != USB_STATE_NOTATTACHED);
157 }
158
159 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
160 {
161         loff_t ret;
162
163         mutex_lock(&file->f_dentry->d_inode->i_mutex);
164
165         switch (orig) {
166         case 0:
167                 file->f_pos = offset;
168                 ret = file->f_pos;
169                 break;
170         case 1:
171                 file->f_pos += offset;
172                 ret = file->f_pos;
173                 break;
174         case 2:
175         default:
176                 ret = -EINVAL;
177         }
178
179         mutex_unlock(&file->f_dentry->d_inode->i_mutex);
180         return ret;
181 }
182
183 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
184                            loff_t *ppos)
185 {
186         struct dev_state *ps = file->private_data;
187         struct usb_device *dev = ps->dev;
188         ssize_t ret = 0;
189         unsigned len;
190         loff_t pos;
191         int i;
192
193         pos = *ppos;
194         usb_lock_device(dev);
195         if (!connected(ps)) {
196                 ret = -ENODEV;
197                 goto err;
198         } else if (pos < 0) {
199                 ret = -EINVAL;
200                 goto err;
201         }
202
203         if (pos < sizeof(struct usb_device_descriptor)) {
204                 /* 18 bytes - fits on the stack */
205                 struct usb_device_descriptor temp_desc;
206
207                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
208                 le16_to_cpus(&temp_desc.bcdUSB);
209                 le16_to_cpus(&temp_desc.idVendor);
210                 le16_to_cpus(&temp_desc.idProduct);
211                 le16_to_cpus(&temp_desc.bcdDevice);
212
213                 len = sizeof(struct usb_device_descriptor) - pos;
214                 if (len > nbytes)
215                         len = nbytes;
216                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
217                         ret = -EFAULT;
218                         goto err;
219                 }
220
221                 *ppos += len;
222                 buf += len;
223                 nbytes -= len;
224                 ret += len;
225         }
226
227         pos = sizeof(struct usb_device_descriptor);
228         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
229                 struct usb_config_descriptor *config =
230                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
231                 unsigned int length = le16_to_cpu(config->wTotalLength);
232
233                 if (*ppos < pos + length) {
234
235                         /* The descriptor may claim to be longer than it
236                          * really is.  Here is the actual allocated length. */
237                         unsigned alloclen =
238                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
239
240                         len = length - (*ppos - pos);
241                         if (len > nbytes)
242                                 len = nbytes;
243
244                         /* Simply don't write (skip over) unallocated parts */
245                         if (alloclen > (*ppos - pos)) {
246                                 alloclen -= (*ppos - pos);
247                                 if (copy_to_user(buf,
248                                     dev->rawdescriptors[i] + (*ppos - pos),
249                                     min(len, alloclen))) {
250                                         ret = -EFAULT;
251                                         goto err;
252                                 }
253                         }
254
255                         *ppos += len;
256                         buf += len;
257                         nbytes -= len;
258                         ret += len;
259                 }
260
261                 pos += length;
262         }
263
264 err:
265         usb_unlock_device(dev);
266         return ret;
267 }
268
269 /*
270  * async list handling
271  */
272
273 static struct async *alloc_async(unsigned int numisoframes)
274 {
275         struct async *as;
276
277         as = kzalloc(sizeof(struct async), GFP_KERNEL);
278         if (!as)
279                 return NULL;
280         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
281         if (!as->urb) {
282                 kfree(as);
283                 return NULL;
284         }
285         return as;
286 }
287
288 static void free_async(struct async *as)
289 {
290         int i;
291
292         put_pid(as->pid);
293         if (as->cred)
294                 put_cred(as->cred);
295         for (i = 0; i < as->urb->num_sgs; i++) {
296                 if (sg_page(&as->urb->sg[i]))
297                         kfree(sg_virt(&as->urb->sg[i]));
298         }
299         kfree(as->urb->sg);
300         kfree(as->urb->transfer_buffer);
301         kfree(as->urb->setup_packet);
302         usb_free_urb(as->urb);
303         usbfs_decrease_memory_usage(as->mem_usage);
304         kfree(as);
305 }
306
307 static void async_newpending(struct async *as)
308 {
309         struct dev_state *ps = as->ps;
310         unsigned long flags;
311
312         spin_lock_irqsave(&ps->lock, flags);
313         list_add_tail(&as->asynclist, &ps->async_pending);
314         spin_unlock_irqrestore(&ps->lock, flags);
315 }
316
317 static void async_removepending(struct async *as)
318 {
319         struct dev_state *ps = as->ps;
320         unsigned long flags;
321
322         spin_lock_irqsave(&ps->lock, flags);
323         list_del_init(&as->asynclist);
324         spin_unlock_irqrestore(&ps->lock, flags);
325 }
326
327 static struct async *async_getcompleted(struct dev_state *ps)
328 {
329         unsigned long flags;
330         struct async *as = NULL;
331
332         spin_lock_irqsave(&ps->lock, flags);
333         if (!list_empty(&ps->async_completed)) {
334                 as = list_entry(ps->async_completed.next, struct async,
335                                 asynclist);
336                 list_del_init(&as->asynclist);
337         }
338         spin_unlock_irqrestore(&ps->lock, flags);
339         return as;
340 }
341
342 static struct async *async_getpending(struct dev_state *ps,
343                                              void __user *userurb)
344 {
345         struct async *as;
346
347         list_for_each_entry(as, &ps->async_pending, asynclist)
348                 if (as->userurb == userurb) {
349                         list_del_init(&as->asynclist);
350                         return as;
351                 }
352
353         return NULL;
354 }
355
356 static void snoop_urb(struct usb_device *udev,
357                 void __user *userurb, int pipe, unsigned length,
358                 int timeout_or_status, enum snoop_when when,
359                 unsigned char *data, unsigned data_len)
360 {
361         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
362         static const char *dirs[] = {"out", "in"};
363         int ep;
364         const char *t, *d;
365
366         if (!usbfs_snoop)
367                 return;
368
369         ep = usb_pipeendpoint(pipe);
370         t = types[usb_pipetype(pipe)];
371         d = dirs[!!usb_pipein(pipe)];
372
373         if (userurb) {          /* Async */
374                 if (when == SUBMIT)
375                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
376                                         "length %u\n",
377                                         userurb, ep, t, d, length);
378                 else
379                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
380                                         "actual_length %u status %d\n",
381                                         userurb, ep, t, d, length,
382                                         timeout_or_status);
383         } else {
384                 if (when == SUBMIT)
385                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
386                                         "timeout %d\n",
387                                         ep, t, d, length, timeout_or_status);
388                 else
389                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
390                                         "status %d\n",
391                                         ep, t, d, length, timeout_or_status);
392         }
393
394         if (data && data_len > 0) {
395                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
396                         data, data_len, 1);
397         }
398 }
399
400 static void snoop_urb_data(struct urb *urb, unsigned len)
401 {
402         int i, size;
403
404         if (!usbfs_snoop)
405                 return;
406
407         if (urb->num_sgs == 0) {
408                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
409                         urb->transfer_buffer, len, 1);
410                 return;
411         }
412
413         for (i = 0; i < urb->num_sgs && len; i++) {
414                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
415                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
416                         sg_virt(&urb->sg[i]), size, 1);
417                 len -= size;
418         }
419 }
420
421 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
422 {
423         unsigned i, len, size;
424
425         if (urb->number_of_packets > 0)         /* Isochronous */
426                 len = urb->transfer_buffer_length;
427         else                                    /* Non-Isoc */
428                 len = urb->actual_length;
429
430         if (urb->num_sgs == 0) {
431                 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
432                         return -EFAULT;
433                 return 0;
434         }
435
436         for (i = 0; i < urb->num_sgs && len; i++) {
437                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
438                 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
439                         return -EFAULT;
440                 userbuffer += size;
441                 len -= size;
442         }
443
444         return 0;
445 }
446
447 #define AS_CONTINUATION 1
448 #define AS_UNLINK       2
449
450 static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr)
451 __releases(ps->lock)
452 __acquires(ps->lock)
453 {
454         struct urb *urb;
455         struct async *as;
456
457         /* Mark all the pending URBs that match bulk_addr, up to but not
458          * including the first one without AS_CONTINUATION.  If such an
459          * URB is encountered then a new transfer has already started so
460          * the endpoint doesn't need to be disabled; otherwise it does.
461          */
462         list_for_each_entry(as, &ps->async_pending, asynclist) {
463                 if (as->bulk_addr == bulk_addr) {
464                         if (as->bulk_status != AS_CONTINUATION)
465                                 goto rescan;
466                         as->bulk_status = AS_UNLINK;
467                         as->bulk_addr = 0;
468                 }
469         }
470         ps->disabled_bulk_eps |= (1 << bulk_addr);
471
472         /* Now carefully unlink all the marked pending URBs */
473  rescan:
474         list_for_each_entry(as, &ps->async_pending, asynclist) {
475                 if (as->bulk_status == AS_UNLINK) {
476                         as->bulk_status = 0;            /* Only once */
477                         urb = as->urb;
478                         usb_get_urb(urb);
479                         spin_unlock(&ps->lock);         /* Allow completions */
480                         usb_unlink_urb(urb);
481                         usb_put_urb(urb);
482                         spin_lock(&ps->lock);
483                         goto rescan;
484                 }
485         }
486 }
487
488 static void async_completed(struct urb *urb)
489 {
490         struct async *as = urb->context;
491         struct dev_state *ps = as->ps;
492         struct siginfo sinfo;
493         struct pid *pid = NULL;
494         u32 secid = 0;
495         const struct cred *cred = NULL;
496         int signr;
497
498         spin_lock(&ps->lock);
499         list_move_tail(&as->asynclist, &ps->async_completed);
500         as->status = urb->status;
501         signr = as->signr;
502         if (signr) {
503                 sinfo.si_signo = as->signr;
504                 sinfo.si_errno = as->status;
505                 sinfo.si_code = SI_ASYNCIO;
506                 sinfo.si_addr = as->userurb;
507                 pid = get_pid(as->pid);
508                 cred = get_cred(as->cred);
509                 secid = as->secid;
510         }
511         snoop(&urb->dev->dev, "urb complete\n");
512         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
513                         as->status, COMPLETE, NULL, 0);
514         if ((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_IN)
515                 snoop_urb_data(urb, urb->actual_length);
516
517         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
518                         as->status != -ENOENT)
519                 cancel_bulk_urbs(ps, as->bulk_addr);
520         spin_unlock(&ps->lock);
521
522         if (signr) {
523                 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
524                 put_pid(pid);
525                 put_cred(cred);
526         }
527
528         wake_up(&ps->wait);
529 }
530
531 static void destroy_async(struct dev_state *ps, struct list_head *list)
532 {
533         struct urb *urb;
534         struct async *as;
535         unsigned long flags;
536
537         spin_lock_irqsave(&ps->lock, flags);
538         while (!list_empty(list)) {
539                 as = list_entry(list->next, struct async, asynclist);
540                 list_del_init(&as->asynclist);
541                 urb = as->urb;
542                 usb_get_urb(urb);
543
544                 /* drop the spinlock so the completion handler can run */
545                 spin_unlock_irqrestore(&ps->lock, flags);
546                 usb_kill_urb(urb);
547                 usb_put_urb(urb);
548                 spin_lock_irqsave(&ps->lock, flags);
549         }
550         spin_unlock_irqrestore(&ps->lock, flags);
551 }
552
553 static void destroy_async_on_interface(struct dev_state *ps,
554                                        unsigned int ifnum)
555 {
556         struct list_head *p, *q, hitlist;
557         unsigned long flags;
558
559         INIT_LIST_HEAD(&hitlist);
560         spin_lock_irqsave(&ps->lock, flags);
561         list_for_each_safe(p, q, &ps->async_pending)
562                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
563                         list_move_tail(p, &hitlist);
564         spin_unlock_irqrestore(&ps->lock, flags);
565         destroy_async(ps, &hitlist);
566 }
567
568 static void destroy_all_async(struct dev_state *ps)
569 {
570         destroy_async(ps, &ps->async_pending);
571 }
572
573 /*
574  * interface claims are made only at the request of user level code,
575  * which can also release them (explicitly or by closing files).
576  * they're also undone when devices disconnect.
577  */
578
579 static int driver_probe(struct usb_interface *intf,
580                         const struct usb_device_id *id)
581 {
582         return -ENODEV;
583 }
584
585 static void driver_disconnect(struct usb_interface *intf)
586 {
587         struct dev_state *ps = usb_get_intfdata(intf);
588         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
589
590         if (!ps)
591                 return;
592
593         /* NOTE:  this relies on usbcore having canceled and completed
594          * all pending I/O requests; 2.6 does that.
595          */
596
597         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
598                 clear_bit(ifnum, &ps->ifclaimed);
599         else
600                 dev_warn(&intf->dev, "interface number %u out of range\n",
601                          ifnum);
602
603         usb_set_intfdata(intf, NULL);
604
605         /* force async requests to complete */
606         destroy_async_on_interface(ps, ifnum);
607 }
608
609 /* The following routines are merely placeholders.  There is no way
610  * to inform a user task about suspend or resumes.
611  */
612 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
613 {
614         return 0;
615 }
616
617 static int driver_resume(struct usb_interface *intf)
618 {
619         return 0;
620 }
621
622 struct usb_driver usbfs_driver = {
623         .name =         "usbfs",
624         .probe =        driver_probe,
625         .disconnect =   driver_disconnect,
626         .suspend =      driver_suspend,
627         .resume =       driver_resume,
628 };
629
630 static int claimintf(struct dev_state *ps, unsigned int ifnum)
631 {
632         struct usb_device *dev = ps->dev;
633         struct usb_interface *intf;
634         int err;
635
636         if (ifnum >= 8*sizeof(ps->ifclaimed))
637                 return -EINVAL;
638         /* already claimed */
639         if (test_bit(ifnum, &ps->ifclaimed))
640                 return 0;
641
642         intf = usb_ifnum_to_if(dev, ifnum);
643         if (!intf)
644                 err = -ENOENT;
645         else
646                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
647         if (err == 0)
648                 set_bit(ifnum, &ps->ifclaimed);
649         return err;
650 }
651
652 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
653 {
654         struct usb_device *dev;
655         struct usb_interface *intf;
656         int err;
657
658         err = -EINVAL;
659         if (ifnum >= 8*sizeof(ps->ifclaimed))
660                 return err;
661         dev = ps->dev;
662         intf = usb_ifnum_to_if(dev, ifnum);
663         if (!intf)
664                 err = -ENOENT;
665         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
666                 usb_driver_release_interface(&usbfs_driver, intf);
667                 err = 0;
668         }
669         return err;
670 }
671
672 static int checkintf(struct dev_state *ps, unsigned int ifnum)
673 {
674         if (ps->dev->state != USB_STATE_CONFIGURED)
675                 return -EHOSTUNREACH;
676         if (ifnum >= 8*sizeof(ps->ifclaimed))
677                 return -EINVAL;
678         if (test_bit(ifnum, &ps->ifclaimed))
679                 return 0;
680         /* if not yet claimed, claim it for the driver */
681         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
682                  "interface %u before use\n", task_pid_nr(current),
683                  current->comm, ifnum);
684         return claimintf(ps, ifnum);
685 }
686
687 static int findintfep(struct usb_device *dev, unsigned int ep)
688 {
689         unsigned int i, j, e;
690         struct usb_interface *intf;
691         struct usb_host_interface *alts;
692         struct usb_endpoint_descriptor *endpt;
693
694         if (ep & ~(USB_DIR_IN|0xf))
695                 return -EINVAL;
696         if (!dev->actconfig)
697                 return -ESRCH;
698         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
699                 intf = dev->actconfig->interface[i];
700                 for (j = 0; j < intf->num_altsetting; j++) {
701                         alts = &intf->altsetting[j];
702                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
703                                 endpt = &alts->endpoint[e].desc;
704                                 if (endpt->bEndpointAddress == ep)
705                                         return alts->desc.bInterfaceNumber;
706                         }
707                 }
708         }
709         return -ENOENT;
710 }
711
712 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
713                            unsigned int request, unsigned int index)
714 {
715         int ret = 0;
716         struct usb_host_interface *alt_setting;
717
718         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
719          && ps->dev->state != USB_STATE_ADDRESS
720          && ps->dev->state != USB_STATE_CONFIGURED)
721                 return -EHOSTUNREACH;
722         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
723                 return 0;
724
725         /*
726          * check for the special corner case 'get_device_id' in the printer
727          * class specification, where wIndex is (interface << 8 | altsetting)
728          * instead of just interface
729          */
730         if (requesttype == 0xa1 && request == 0) {
731                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
732                                                    index >> 8, index & 0xff);
733                 if (alt_setting
734                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
735                         index >>= 8;
736         }
737
738         index &= 0xff;
739         switch (requesttype & USB_RECIP_MASK) {
740         case USB_RECIP_ENDPOINT:
741                 ret = findintfep(ps->dev, index);
742                 if (ret >= 0)
743                         ret = checkintf(ps, ret);
744                 break;
745
746         case USB_RECIP_INTERFACE:
747                 ret = checkintf(ps, index);
748                 break;
749         }
750         return ret;
751 }
752
753 static int match_devt(struct device *dev, void *data)
754 {
755         return dev->devt == (dev_t) (unsigned long) data;
756 }
757
758 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
759 {
760         struct device *dev;
761
762         dev = bus_find_device(&usb_bus_type, NULL,
763                               (void *) (unsigned long) devt, match_devt);
764         if (!dev)
765                 return NULL;
766         return container_of(dev, struct usb_device, dev);
767 }
768
769 /*
770  * file operations
771  */
772 static int usbdev_open(struct inode *inode, struct file *file)
773 {
774         struct usb_device *dev = NULL;
775         struct dev_state *ps;
776         int ret;
777
778         ret = -ENOMEM;
779         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
780         if (!ps)
781                 goto out_free_ps;
782
783         ret = -ENODEV;
784
785         /* Protect against simultaneous removal or release */
786         mutex_lock(&usbfs_mutex);
787
788         /* usbdev device-node */
789         if (imajor(inode) == USB_DEVICE_MAJOR)
790                 dev = usbdev_lookup_by_devt(inode->i_rdev);
791
792         mutex_unlock(&usbfs_mutex);
793
794         if (!dev)
795                 goto out_free_ps;
796
797         usb_lock_device(dev);
798         if (dev->state == USB_STATE_NOTATTACHED)
799                 goto out_unlock_device;
800
801         ret = usb_autoresume_device(dev);
802         if (ret)
803                 goto out_unlock_device;
804
805         ps->dev = dev;
806         ps->file = file;
807         spin_lock_init(&ps->lock);
808         INIT_LIST_HEAD(&ps->list);
809         INIT_LIST_HEAD(&ps->async_pending);
810         INIT_LIST_HEAD(&ps->async_completed);
811         init_waitqueue_head(&ps->wait);
812         ps->discsignr = 0;
813         ps->disc_pid = get_pid(task_pid(current));
814         ps->cred = get_current_cred();
815         ps->disccontext = NULL;
816         ps->ifclaimed = 0;
817         security_task_getsecid(current, &ps->secid);
818         smp_wmb();
819         list_add_tail(&ps->list, &dev->filelist);
820         file->private_data = ps;
821         usb_unlock_device(dev);
822         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
823                         current->comm);
824         return ret;
825
826  out_unlock_device:
827         usb_unlock_device(dev);
828         usb_put_dev(dev);
829  out_free_ps:
830         kfree(ps);
831         return ret;
832 }
833
834 static int usbdev_release(struct inode *inode, struct file *file)
835 {
836         struct dev_state *ps = file->private_data;
837         struct usb_device *dev = ps->dev;
838         unsigned int ifnum;
839         struct async *as;
840
841         usb_lock_device(dev);
842         usb_hub_release_all_ports(dev, ps);
843
844         list_del_init(&ps->list);
845
846         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
847                         ifnum++) {
848                 if (test_bit(ifnum, &ps->ifclaimed))
849                         releaseintf(ps, ifnum);
850         }
851         destroy_all_async(ps);
852         usb_autosuspend_device(dev);
853         usb_unlock_device(dev);
854         usb_put_dev(dev);
855         put_pid(ps->disc_pid);
856         put_cred(ps->cred);
857
858         as = async_getcompleted(ps);
859         while (as) {
860                 free_async(as);
861                 as = async_getcompleted(ps);
862         }
863         kfree(ps);
864         return 0;
865 }
866
867 static int proc_control(struct dev_state *ps, void __user *arg)
868 {
869         struct usb_device *dev = ps->dev;
870         struct usbdevfs_ctrltransfer ctrl;
871         unsigned int tmo;
872         unsigned char *tbuf;
873         unsigned wLength;
874         int i, pipe, ret;
875
876         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
877                 return -EFAULT;
878         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
879                               ctrl.wIndex);
880         if (ret)
881                 return ret;
882         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
883         if (wLength > PAGE_SIZE)
884                 return -EINVAL;
885         ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
886                         sizeof(struct usb_ctrlrequest));
887         if (ret)
888                 return ret;
889         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
890         if (!tbuf) {
891                 ret = -ENOMEM;
892                 goto done;
893         }
894         tmo = ctrl.timeout;
895         snoop(&dev->dev, "control urb: bRequestType=%02x "
896                 "bRequest=%02x wValue=%04x "
897                 "wIndex=%04x wLength=%04x\n",
898                 ctrl.bRequestType, ctrl.bRequest,
899                 __le16_to_cpup(&ctrl.wValue),
900                 __le16_to_cpup(&ctrl.wIndex),
901                 __le16_to_cpup(&ctrl.wLength));
902         if (ctrl.bRequestType & 0x80) {
903                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
904                                                ctrl.wLength)) {
905                         ret = -EINVAL;
906                         goto done;
907                 }
908                 pipe = usb_rcvctrlpipe(dev, 0);
909                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
910
911                 usb_unlock_device(dev);
912                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
913                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
914                                     tbuf, ctrl.wLength, tmo);
915                 usb_lock_device(dev);
916                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
917                           tbuf, max(i, 0));
918                 if ((i > 0) && ctrl.wLength) {
919                         if (copy_to_user(ctrl.data, tbuf, i)) {
920                                 ret = -EFAULT;
921                                 goto done;
922                         }
923                 }
924         } else {
925                 if (ctrl.wLength) {
926                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
927                                 ret = -EFAULT;
928                                 goto done;
929                         }
930                 }
931                 pipe = usb_sndctrlpipe(dev, 0);
932                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
933                         tbuf, ctrl.wLength);
934
935                 usb_unlock_device(dev);
936                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
937                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
938                                     tbuf, ctrl.wLength, tmo);
939                 usb_lock_device(dev);
940                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
941         }
942         if (i < 0 && i != -EPIPE) {
943                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
944                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
945                            current->comm, ctrl.bRequestType, ctrl.bRequest,
946                            ctrl.wLength, i);
947         }
948         ret = i;
949  done:
950         free_page((unsigned long) tbuf);
951         usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
952                         sizeof(struct usb_ctrlrequest));
953         return ret;
954 }
955
956 static int proc_bulk(struct dev_state *ps, void __user *arg)
957 {
958         struct usb_device *dev = ps->dev;
959         struct usbdevfs_bulktransfer bulk;
960         unsigned int tmo, len1, pipe;
961         int len2;
962         unsigned char *tbuf;
963         int i, ret;
964
965         if (copy_from_user(&bulk, arg, sizeof(bulk)))
966                 return -EFAULT;
967         ret = findintfep(ps->dev, bulk.ep);
968         if (ret < 0)
969                 return ret;
970         ret = checkintf(ps, ret);
971         if (ret)
972                 return ret;
973         if (bulk.ep & USB_DIR_IN)
974                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
975         else
976                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
977         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
978                 return -EINVAL;
979         len1 = bulk.len;
980         if (len1 >= USBFS_XFER_MAX)
981                 return -EINVAL;
982         ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
983         if (ret)
984                 return ret;
985         if (!(tbuf = kmalloc(len1, GFP_KERNEL))) {
986                 ret = -ENOMEM;
987                 goto done;
988         }
989         tmo = bulk.timeout;
990         if (bulk.ep & 0x80) {
991                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
992                         ret = -EINVAL;
993                         goto done;
994                 }
995                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
996
997                 usb_unlock_device(dev);
998                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
999                 usb_lock_device(dev);
1000                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1001
1002                 if (!i && len2) {
1003                         if (copy_to_user(bulk.data, tbuf, len2)) {
1004                                 ret = -EFAULT;
1005                                 goto done;
1006                         }
1007                 }
1008         } else {
1009                 if (len1) {
1010                         if (copy_from_user(tbuf, bulk.data, len1)) {
1011                                 ret = -EFAULT;
1012                                 goto done;
1013                         }
1014                 }
1015                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1016
1017                 usb_unlock_device(dev);
1018                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1019                 usb_lock_device(dev);
1020                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1021         }
1022         ret = (i < 0 ? i : len2);
1023  done:
1024         kfree(tbuf);
1025         usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1026         return ret;
1027 }
1028
1029 static int proc_resetep(struct dev_state *ps, void __user *arg)
1030 {
1031         unsigned int ep;
1032         int ret;
1033
1034         if (get_user(ep, (unsigned int __user *)arg))
1035                 return -EFAULT;
1036         ret = findintfep(ps->dev, ep);
1037         if (ret < 0)
1038                 return ret;
1039         ret = checkintf(ps, ret);
1040         if (ret)
1041                 return ret;
1042         usb_reset_endpoint(ps->dev, ep);
1043         return 0;
1044 }
1045
1046 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
1047 {
1048         unsigned int ep;
1049         int pipe;
1050         int ret;
1051
1052         if (get_user(ep, (unsigned int __user *)arg))
1053                 return -EFAULT;
1054         ret = findintfep(ps->dev, ep);
1055         if (ret < 0)
1056                 return ret;
1057         ret = checkintf(ps, ret);
1058         if (ret)
1059                 return ret;
1060         if (ep & USB_DIR_IN)
1061                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1062         else
1063                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1064
1065         return usb_clear_halt(ps->dev, pipe);
1066 }
1067
1068 static int proc_getdriver(struct dev_state *ps, void __user *arg)
1069 {
1070         struct usbdevfs_getdriver gd;
1071         struct usb_interface *intf;
1072         int ret;
1073
1074         if (copy_from_user(&gd, arg, sizeof(gd)))
1075                 return -EFAULT;
1076         intf = usb_ifnum_to_if(ps->dev, gd.interface);
1077         if (!intf || !intf->dev.driver)
1078                 ret = -ENODATA;
1079         else {
1080                 strncpy(gd.driver, intf->dev.driver->name,
1081                                 sizeof(gd.driver));
1082                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1083         }
1084         return ret;
1085 }
1086
1087 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
1088 {
1089         struct usbdevfs_connectinfo ci = {
1090                 .devnum = ps->dev->devnum,
1091                 .slow = ps->dev->speed == USB_SPEED_LOW
1092         };
1093
1094         if (copy_to_user(arg, &ci, sizeof(ci)))
1095                 return -EFAULT;
1096         return 0;
1097 }
1098
1099 static int proc_resetdevice(struct dev_state *ps)
1100 {
1101         return usb_reset_device(ps->dev);
1102 }
1103
1104 static int proc_setintf(struct dev_state *ps, void __user *arg)
1105 {
1106         struct usbdevfs_setinterface setintf;
1107         int ret;
1108
1109         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1110                 return -EFAULT;
1111         if ((ret = checkintf(ps, setintf.interface)))
1112                 return ret;
1113         return usb_set_interface(ps->dev, setintf.interface,
1114                         setintf.altsetting);
1115 }
1116
1117 static int proc_setconfig(struct dev_state *ps, void __user *arg)
1118 {
1119         int u;
1120         int status = 0;
1121         struct usb_host_config *actconfig;
1122
1123         if (get_user(u, (int __user *)arg))
1124                 return -EFAULT;
1125
1126         actconfig = ps->dev->actconfig;
1127
1128         /* Don't touch the device if any interfaces are claimed.
1129          * It could interfere with other drivers' operations, and if
1130          * an interface is claimed by usbfs it could easily deadlock.
1131          */
1132         if (actconfig) {
1133                 int i;
1134
1135                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1136                         if (usb_interface_claimed(actconfig->interface[i])) {
1137                                 dev_warn(&ps->dev->dev,
1138                                         "usbfs: interface %d claimed by %s "
1139                                         "while '%s' sets config #%d\n",
1140                                         actconfig->interface[i]
1141                                                 ->cur_altsetting
1142                                                 ->desc.bInterfaceNumber,
1143                                         actconfig->interface[i]
1144                                                 ->dev.driver->name,
1145                                         current->comm, u);
1146                                 status = -EBUSY;
1147                                 break;
1148                         }
1149                 }
1150         }
1151
1152         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1153          * so avoid usb_set_configuration()'s kick to sysfs
1154          */
1155         if (status == 0) {
1156                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1157                         status = usb_reset_configuration(ps->dev);
1158                 else
1159                         status = usb_set_configuration(ps->dev, u);
1160         }
1161
1162         return status;
1163 }
1164
1165 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1166                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1167                         void __user *arg)
1168 {
1169         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1170         struct usb_host_endpoint *ep;
1171         struct async *as = NULL;
1172         struct usb_ctrlrequest *dr = NULL;
1173         unsigned int u, totlen, isofrmlen;
1174         int i, ret, is_in, num_sgs = 0, ifnum = -1;
1175         void *buf;
1176
1177         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1178                                 USBDEVFS_URB_SHORT_NOT_OK |
1179                                 USBDEVFS_URB_BULK_CONTINUATION |
1180                                 USBDEVFS_URB_NO_FSBR |
1181                                 USBDEVFS_URB_ZERO_PACKET |
1182                                 USBDEVFS_URB_NO_INTERRUPT))
1183                 return -EINVAL;
1184         if (uurb->buffer_length > 0 && !uurb->buffer)
1185                 return -EINVAL;
1186         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1187             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1188                 ifnum = findintfep(ps->dev, uurb->endpoint);
1189                 if (ifnum < 0)
1190                         return ifnum;
1191                 ret = checkintf(ps, ifnum);
1192                 if (ret)
1193                         return ret;
1194         }
1195         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1196                 is_in = 1;
1197                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1198         } else {
1199                 is_in = 0;
1200                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1201         }
1202         if (!ep)
1203                 return -ENOENT;
1204
1205         u = 0;
1206         switch(uurb->type) {
1207         case USBDEVFS_URB_TYPE_CONTROL:
1208                 if (!usb_endpoint_xfer_control(&ep->desc))
1209                         return -EINVAL;
1210                 /* min 8 byte setup packet */
1211                 if (uurb->buffer_length < 8)
1212                         return -EINVAL;
1213                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1214                 if (!dr)
1215                         return -ENOMEM;
1216                 if (copy_from_user(dr, uurb->buffer, 8)) {
1217                         ret = -EFAULT;
1218                         goto error;
1219                 }
1220                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1221                         ret = -EINVAL;
1222                         goto error;
1223                 }
1224                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1225                                       le16_to_cpup(&dr->wIndex));
1226                 if (ret)
1227                         goto error;
1228                 uurb->number_of_packets = 0;
1229                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1230                 uurb->buffer += 8;
1231                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1232                         is_in = 1;
1233                         uurb->endpoint |= USB_DIR_IN;
1234                 } else {
1235                         is_in = 0;
1236                         uurb->endpoint &= ~USB_DIR_IN;
1237                 }
1238                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1239                         "bRequest=%02x wValue=%04x "
1240                         "wIndex=%04x wLength=%04x\n",
1241                         dr->bRequestType, dr->bRequest,
1242                         __le16_to_cpup(&dr->wValue),
1243                         __le16_to_cpup(&dr->wIndex),
1244                         __le16_to_cpup(&dr->wLength));
1245                 u = sizeof(struct usb_ctrlrequest);
1246                 break;
1247
1248         case USBDEVFS_URB_TYPE_BULK:
1249                 switch (usb_endpoint_type(&ep->desc)) {
1250                 case USB_ENDPOINT_XFER_CONTROL:
1251                 case USB_ENDPOINT_XFER_ISOC:
1252                         return -EINVAL;
1253                 case USB_ENDPOINT_XFER_INT:
1254                         /* allow single-shot interrupt transfers */
1255                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1256                         goto interrupt_urb;
1257                 }
1258                 uurb->number_of_packets = 0;
1259                 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1260                 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1261                         num_sgs = 0;
1262                 break;
1263
1264         case USBDEVFS_URB_TYPE_INTERRUPT:
1265                 if (!usb_endpoint_xfer_int(&ep->desc))
1266                         return -EINVAL;
1267  interrupt_urb:
1268                 uurb->number_of_packets = 0;
1269                 break;
1270
1271         case USBDEVFS_URB_TYPE_ISO:
1272                 /* arbitrary limit */
1273                 if (uurb->number_of_packets < 1 ||
1274                     uurb->number_of_packets > 128)
1275                         return -EINVAL;
1276                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1277                         return -EINVAL;
1278                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1279                                    uurb->number_of_packets;
1280                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1281                         return -ENOMEM;
1282                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1283                         ret = -EFAULT;
1284                         goto error;
1285                 }
1286                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1287                         /* arbitrary limit,
1288                          * sufficient for USB 2.0 high-bandwidth iso */
1289                         if (isopkt[u].length > 8192) {
1290                                 ret = -EINVAL;
1291                                 goto error;
1292                         }
1293                         totlen += isopkt[u].length;
1294                 }
1295                 u *= sizeof(struct usb_iso_packet_descriptor);
1296                 uurb->buffer_length = totlen;
1297                 break;
1298
1299         default:
1300                 return -EINVAL;
1301         }
1302
1303         if (uurb->buffer_length >= USBFS_XFER_MAX) {
1304                 ret = -EINVAL;
1305                 goto error;
1306         }
1307         if (uurb->buffer_length > 0 &&
1308                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1309                                 uurb->buffer, uurb->buffer_length)) {
1310                 ret = -EFAULT;
1311                 goto error;
1312         }
1313         as = alloc_async(uurb->number_of_packets);
1314         if (!as) {
1315                 ret = -ENOMEM;
1316                 goto error;
1317         }
1318
1319         u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1320              num_sgs * sizeof(struct scatterlist);
1321         ret = usbfs_increase_memory_usage(u);
1322         if (ret)
1323                 goto error;
1324         as->mem_usage = u;
1325
1326         if (num_sgs) {
1327                 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1328                                       GFP_KERNEL);
1329                 if (!as->urb->sg) {
1330                         ret = -ENOMEM;
1331                         goto error;
1332                 }
1333                 as->urb->num_sgs = num_sgs;
1334                 sg_init_table(as->urb->sg, as->urb->num_sgs);
1335
1336                 totlen = uurb->buffer_length;
1337                 for (i = 0; i < as->urb->num_sgs; i++) {
1338                         u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1339                         buf = kmalloc(u, GFP_KERNEL);
1340                         if (!buf) {
1341                                 ret = -ENOMEM;
1342                                 goto error;
1343                         }
1344                         sg_set_buf(&as->urb->sg[i], buf, u);
1345
1346                         if (!is_in) {
1347                                 if (copy_from_user(buf, uurb->buffer, u)) {
1348                                         ret = -EFAULT;
1349                                         goto error;
1350                                 }
1351                                 uurb->buffer += u;
1352                         }
1353                         totlen -= u;
1354                 }
1355         } else if (uurb->buffer_length > 0) {
1356                 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1357                                 GFP_KERNEL);
1358                 if (!as->urb->transfer_buffer) {
1359                         ret = -ENOMEM;
1360                         goto error;
1361                 }
1362
1363                 if (!is_in) {
1364                         if (copy_from_user(as->urb->transfer_buffer,
1365                                            uurb->buffer,
1366                                            uurb->buffer_length)) {
1367                                 ret = -EFAULT;
1368                                 goto error;
1369                         }
1370                 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1371                         /*
1372                          * Isochronous input data may end up being
1373                          * discontiguous if some of the packets are short.
1374                          * Clear the buffer so that the gaps don't leak
1375                          * kernel data to userspace.
1376                          */
1377                         memset(as->urb->transfer_buffer, 0,
1378                                         uurb->buffer_length);
1379                 }
1380         }
1381         as->urb->dev = ps->dev;
1382         as->urb->pipe = (uurb->type << 30) |
1383                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1384                         (uurb->endpoint & USB_DIR_IN);
1385
1386         /* This tedious sequence is necessary because the URB_* flags
1387          * are internal to the kernel and subject to change, whereas
1388          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1389          */
1390         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1391         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1392                 u |= URB_ISO_ASAP;
1393         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1394                 u |= URB_SHORT_NOT_OK;
1395         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1396                 u |= URB_NO_FSBR;
1397         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1398                 u |= URB_ZERO_PACKET;
1399         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1400                 u |= URB_NO_INTERRUPT;
1401         as->urb->transfer_flags = u;
1402
1403         as->urb->transfer_buffer_length = uurb->buffer_length;
1404         as->urb->setup_packet = (unsigned char *)dr;
1405         dr = NULL;
1406         as->urb->start_frame = uurb->start_frame;
1407         as->urb->number_of_packets = uurb->number_of_packets;
1408         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1409                         ps->dev->speed == USB_SPEED_HIGH)
1410                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1411         else
1412                 as->urb->interval = ep->desc.bInterval;
1413         as->urb->context = as;
1414         as->urb->complete = async_completed;
1415         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1416                 as->urb->iso_frame_desc[u].offset = totlen;
1417                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1418                 totlen += isopkt[u].length;
1419         }
1420         kfree(isopkt);
1421         isopkt = NULL;
1422         as->ps = ps;
1423         as->userurb = arg;
1424         if (is_in && uurb->buffer_length > 0)
1425                 as->userbuffer = uurb->buffer;
1426         else
1427                 as->userbuffer = NULL;
1428         as->signr = uurb->signr;
1429         as->ifnum = ifnum;
1430         as->pid = get_pid(task_pid(current));
1431         as->cred = get_current_cred();
1432         security_task_getsecid(current, &as->secid);
1433         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1434                         as->urb->transfer_buffer_length, 0, SUBMIT,
1435                         NULL, 0);
1436         if (!is_in)
1437                 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1438
1439         async_newpending(as);
1440
1441         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1442                 spin_lock_irq(&ps->lock);
1443
1444                 /* Not exactly the endpoint address; the direction bit is
1445                  * shifted to the 0x10 position so that the value will be
1446                  * between 0 and 31.
1447                  */
1448                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1449                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1450                                 >> 3);
1451
1452                 /* If this bulk URB is the start of a new transfer, re-enable
1453                  * the endpoint.  Otherwise mark it as a continuation URB.
1454                  */
1455                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1456                         as->bulk_status = AS_CONTINUATION;
1457                 else
1458                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1459
1460                 /* Don't accept continuation URBs if the endpoint is
1461                  * disabled because of an earlier error.
1462                  */
1463                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1464                         ret = -EREMOTEIO;
1465                 else
1466                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1467                 spin_unlock_irq(&ps->lock);
1468         } else {
1469                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1470         }
1471
1472         if (ret) {
1473                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1474                            "usbfs: usb_submit_urb returned %d\n", ret);
1475                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1476                                 0, ret, COMPLETE, NULL, 0);
1477                 async_removepending(as);
1478                 goto error;
1479         }
1480         return 0;
1481
1482  error:
1483         kfree(isopkt);
1484         kfree(dr);
1485         if (as)
1486                 free_async(as);
1487         return ret;
1488 }
1489
1490 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1491 {
1492         struct usbdevfs_urb uurb;
1493
1494         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1495                 return -EFAULT;
1496
1497         return proc_do_submiturb(ps, &uurb,
1498                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1499                         arg);
1500 }
1501
1502 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1503 {
1504         struct urb *urb;
1505         struct async *as;
1506         unsigned long flags;
1507
1508         spin_lock_irqsave(&ps->lock, flags);
1509         as = async_getpending(ps, arg);
1510         if (!as) {
1511                 spin_unlock_irqrestore(&ps->lock, flags);
1512                 return -EINVAL;
1513         }
1514
1515         urb = as->urb;
1516         usb_get_urb(urb);
1517         spin_unlock_irqrestore(&ps->lock, flags);
1518
1519         usb_kill_urb(urb);
1520         usb_put_urb(urb);
1521
1522         return 0;
1523 }
1524
1525 static int processcompl(struct async *as, void __user * __user *arg)
1526 {
1527         struct urb *urb = as->urb;
1528         struct usbdevfs_urb __user *userurb = as->userurb;
1529         void __user *addr = as->userurb;
1530         unsigned int i;
1531
1532         if (as->userbuffer && urb->actual_length) {
1533                 if (copy_urb_data_to_user(as->userbuffer, urb))
1534                         goto err_out;
1535         }
1536         if (put_user(as->status, &userurb->status))
1537                 goto err_out;
1538         if (put_user(urb->actual_length, &userurb->actual_length))
1539                 goto err_out;
1540         if (put_user(urb->error_count, &userurb->error_count))
1541                 goto err_out;
1542
1543         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1544                 for (i = 0; i < urb->number_of_packets; i++) {
1545                         if (put_user(urb->iso_frame_desc[i].actual_length,
1546                                      &userurb->iso_frame_desc[i].actual_length))
1547                                 goto err_out;
1548                         if (put_user(urb->iso_frame_desc[i].status,
1549                                      &userurb->iso_frame_desc[i].status))
1550                                 goto err_out;
1551                 }
1552         }
1553
1554         if (put_user(addr, (void __user * __user *)arg))
1555                 return -EFAULT;
1556         return 0;
1557
1558 err_out:
1559         return -EFAULT;
1560 }
1561
1562 static struct async *reap_as(struct dev_state *ps)
1563 {
1564         DECLARE_WAITQUEUE(wait, current);
1565         struct async *as = NULL;
1566         struct usb_device *dev = ps->dev;
1567
1568         add_wait_queue(&ps->wait, &wait);
1569         for (;;) {
1570                 __set_current_state(TASK_INTERRUPTIBLE);
1571                 as = async_getcompleted(ps);
1572                 if (as)
1573                         break;
1574                 if (signal_pending(current))
1575                         break;
1576                 usb_unlock_device(dev);
1577                 schedule();
1578                 usb_lock_device(dev);
1579         }
1580         remove_wait_queue(&ps->wait, &wait);
1581         set_current_state(TASK_RUNNING);
1582         return as;
1583 }
1584
1585 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1586 {
1587         struct async *as = reap_as(ps);
1588         if (as) {
1589                 int retval = processcompl(as, (void __user * __user *)arg);
1590                 free_async(as);
1591                 return retval;
1592         }
1593         if (signal_pending(current))
1594                 return -EINTR;
1595         return -EIO;
1596 }
1597
1598 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1599 {
1600         int retval;
1601         struct async *as;
1602
1603         as = async_getcompleted(ps);
1604         retval = -EAGAIN;
1605         if (as) {
1606                 retval = processcompl(as, (void __user * __user *)arg);
1607                 free_async(as);
1608         }
1609         return retval;
1610 }
1611
1612 #ifdef CONFIG_COMPAT
1613 static int proc_control_compat(struct dev_state *ps,
1614                                 struct usbdevfs_ctrltransfer32 __user *p32)
1615 {
1616         struct usbdevfs_ctrltransfer __user *p;
1617         __u32 udata;
1618         p = compat_alloc_user_space(sizeof(*p));
1619         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1620             get_user(udata, &p32->data) ||
1621             put_user(compat_ptr(udata), &p->data))
1622                 return -EFAULT;
1623         return proc_control(ps, p);
1624 }
1625
1626 static int proc_bulk_compat(struct dev_state *ps,
1627                         struct usbdevfs_bulktransfer32 __user *p32)
1628 {
1629         struct usbdevfs_bulktransfer __user *p;
1630         compat_uint_t n;
1631         compat_caddr_t addr;
1632
1633         p = compat_alloc_user_space(sizeof(*p));
1634
1635         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1636             get_user(n, &p32->len) || put_user(n, &p->len) ||
1637             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1638             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1639                 return -EFAULT;
1640
1641         return proc_bulk(ps, p);
1642 }
1643 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1644 {
1645         struct usbdevfs_disconnectsignal32 ds;
1646
1647         if (copy_from_user(&ds, arg, sizeof(ds)))
1648                 return -EFAULT;
1649         ps->discsignr = ds.signr;
1650         ps->disccontext = compat_ptr(ds.context);
1651         return 0;
1652 }
1653
1654 static int get_urb32(struct usbdevfs_urb *kurb,
1655                      struct usbdevfs_urb32 __user *uurb)
1656 {
1657         __u32  uptr;
1658         if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1659             __get_user(kurb->type, &uurb->type) ||
1660             __get_user(kurb->endpoint, &uurb->endpoint) ||
1661             __get_user(kurb->status, &uurb->status) ||
1662             __get_user(kurb->flags, &uurb->flags) ||
1663             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1664             __get_user(kurb->actual_length, &uurb->actual_length) ||
1665             __get_user(kurb->start_frame, &uurb->start_frame) ||
1666             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1667             __get_user(kurb->error_count, &uurb->error_count) ||
1668             __get_user(kurb->signr, &uurb->signr))
1669                 return -EFAULT;
1670
1671         if (__get_user(uptr, &uurb->buffer))
1672                 return -EFAULT;
1673         kurb->buffer = compat_ptr(uptr);
1674         if (__get_user(uptr, &uurb->usercontext))
1675                 return -EFAULT;
1676         kurb->usercontext = compat_ptr(uptr);
1677
1678         return 0;
1679 }
1680
1681 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1682 {
1683         struct usbdevfs_urb uurb;
1684
1685         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1686                 return -EFAULT;
1687
1688         return proc_do_submiturb(ps, &uurb,
1689                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1690                         arg);
1691 }
1692
1693 static int processcompl_compat(struct async *as, void __user * __user *arg)
1694 {
1695         struct urb *urb = as->urb;
1696         struct usbdevfs_urb32 __user *userurb = as->userurb;
1697         void __user *addr = as->userurb;
1698         unsigned int i;
1699
1700         if (as->userbuffer && urb->actual_length) {
1701                 if (copy_urb_data_to_user(as->userbuffer, urb))
1702                         return -EFAULT;
1703         }
1704         if (put_user(as->status, &userurb->status))
1705                 return -EFAULT;
1706         if (put_user(urb->actual_length, &userurb->actual_length))
1707                 return -EFAULT;
1708         if (put_user(urb->error_count, &userurb->error_count))
1709                 return -EFAULT;
1710
1711         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1712                 for (i = 0; i < urb->number_of_packets; i++) {
1713                         if (put_user(urb->iso_frame_desc[i].actual_length,
1714                                      &userurb->iso_frame_desc[i].actual_length))
1715                                 return -EFAULT;
1716                         if (put_user(urb->iso_frame_desc[i].status,
1717                                      &userurb->iso_frame_desc[i].status))
1718                                 return -EFAULT;
1719                 }
1720         }
1721
1722         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1723                 return -EFAULT;
1724         return 0;
1725 }
1726
1727 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1728 {
1729         struct async *as = reap_as(ps);
1730         if (as) {
1731                 int retval = processcompl_compat(as, (void __user * __user *)arg);
1732                 free_async(as);
1733                 return retval;
1734         }
1735         if (signal_pending(current))
1736                 return -EINTR;
1737         return -EIO;
1738 }
1739
1740 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1741 {
1742         int retval;
1743         struct async *as;
1744
1745         retval = -EAGAIN;
1746         as = async_getcompleted(ps);
1747         if (as) {
1748                 retval = processcompl_compat(as, (void __user * __user *)arg);
1749                 free_async(as);
1750         }
1751         return retval;
1752 }
1753
1754
1755 #endif
1756
1757 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1758 {
1759         struct usbdevfs_disconnectsignal ds;
1760
1761         if (copy_from_user(&ds, arg, sizeof(ds)))
1762                 return -EFAULT;
1763         ps->discsignr = ds.signr;
1764         ps->disccontext = ds.context;
1765         return 0;
1766 }
1767
1768 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1769 {
1770         unsigned int ifnum;
1771
1772         if (get_user(ifnum, (unsigned int __user *)arg))
1773                 return -EFAULT;
1774         return claimintf(ps, ifnum);
1775 }
1776
1777 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1778 {
1779         unsigned int ifnum;
1780         int ret;
1781
1782         if (get_user(ifnum, (unsigned int __user *)arg))
1783                 return -EFAULT;
1784         if ((ret = releaseintf(ps, ifnum)) < 0)
1785                 return ret;
1786         destroy_async_on_interface (ps, ifnum);
1787         return 0;
1788 }
1789
1790 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1791 {
1792         int                     size;
1793         void                    *buf = NULL;
1794         int                     retval = 0;
1795         struct usb_interface    *intf = NULL;
1796         struct usb_driver       *driver = NULL;
1797
1798         /* alloc buffer */
1799         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1800                 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1801                         return -ENOMEM;
1802                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1803                         if (copy_from_user(buf, ctl->data, size)) {
1804                                 kfree(buf);
1805                                 return -EFAULT;
1806                         }
1807                 } else {
1808                         memset(buf, 0, size);
1809                 }
1810         }
1811
1812         if (!connected(ps)) {
1813                 kfree(buf);
1814                 return -ENODEV;
1815         }
1816
1817         if (ps->dev->state != USB_STATE_CONFIGURED)
1818                 retval = -EHOSTUNREACH;
1819         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1820                 retval = -EINVAL;
1821         else switch (ctl->ioctl_code) {
1822
1823         /* disconnect kernel driver from interface */
1824         case USBDEVFS_DISCONNECT:
1825                 if (intf->dev.driver) {
1826                         driver = to_usb_driver(intf->dev.driver);
1827                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1828                         usb_driver_release_interface(driver, intf);
1829                 } else
1830                         retval = -ENODATA;
1831                 break;
1832
1833         /* let kernel drivers try to (re)bind to the interface */
1834         case USBDEVFS_CONNECT:
1835                 if (!intf->dev.driver)
1836                         retval = device_attach(&intf->dev);
1837                 else
1838                         retval = -EBUSY;
1839                 break;
1840
1841         /* talk directly to the interface's driver */
1842         default:
1843                 if (intf->dev.driver)
1844                         driver = to_usb_driver(intf->dev.driver);
1845                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1846                         retval = -ENOTTY;
1847                 } else {
1848                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1849                         if (retval == -ENOIOCTLCMD)
1850                                 retval = -ENOTTY;
1851                 }
1852         }
1853
1854         /* cleanup and return */
1855         if (retval >= 0
1856                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1857                         && size > 0
1858                         && copy_to_user(ctl->data, buf, size) != 0)
1859                 retval = -EFAULT;
1860
1861         kfree(buf);
1862         return retval;
1863 }
1864
1865 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1866 {
1867         struct usbdevfs_ioctl   ctrl;
1868
1869         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1870                 return -EFAULT;
1871         return proc_ioctl(ps, &ctrl);
1872 }
1873
1874 #ifdef CONFIG_COMPAT
1875 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1876 {
1877         struct usbdevfs_ioctl32 __user *uioc;
1878         struct usbdevfs_ioctl ctrl;
1879         u32 udata;
1880
1881         uioc = compat_ptr((long)arg);
1882         if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1883             __get_user(ctrl.ifno, &uioc->ifno) ||
1884             __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1885             __get_user(udata, &uioc->data))
1886                 return -EFAULT;
1887         ctrl.data = compat_ptr(udata);
1888
1889         return proc_ioctl(ps, &ctrl);
1890 }
1891 #endif
1892
1893 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1894 {
1895         unsigned portnum;
1896         int rc;
1897
1898         if (get_user(portnum, (unsigned __user *) arg))
1899                 return -EFAULT;
1900         rc = usb_hub_claim_port(ps->dev, portnum, ps);
1901         if (rc == 0)
1902                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1903                         portnum, task_pid_nr(current), current->comm);
1904         return rc;
1905 }
1906
1907 static int proc_release_port(struct dev_state *ps, void __user *arg)
1908 {
1909         unsigned portnum;
1910
1911         if (get_user(portnum, (unsigned __user *) arg))
1912                 return -EFAULT;
1913         return usb_hub_release_port(ps->dev, portnum, ps);
1914 }
1915
1916 static int proc_get_capabilities(struct dev_state *ps, void __user *arg)
1917 {
1918         __u32 caps;
1919
1920         caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM;
1921         if (!ps->dev->bus->no_stop_on_short)
1922                 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
1923         if (ps->dev->bus->sg_tablesize)
1924                 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
1925
1926         if (put_user(caps, (__u32 __user *)arg))
1927                 return -EFAULT;
1928
1929         return 0;
1930 }
1931
1932 static int proc_disconnect_claim(struct dev_state *ps, void __user *arg)
1933 {
1934         struct usbdevfs_disconnect_claim dc;
1935         struct usb_interface *intf;
1936
1937         if (copy_from_user(&dc, arg, sizeof(dc)))
1938                 return -EFAULT;
1939
1940         intf = usb_ifnum_to_if(ps->dev, dc.interface);
1941         if (!intf)
1942                 return -EINVAL;
1943
1944         if (intf->dev.driver) {
1945                 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
1946
1947                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
1948                                 strncmp(dc.driver, intf->dev.driver->name,
1949                                         sizeof(dc.driver)) != 0)
1950                         return -EBUSY;
1951
1952                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
1953                                 strncmp(dc.driver, intf->dev.driver->name,
1954                                         sizeof(dc.driver)) == 0)
1955                         return -EBUSY;
1956
1957                 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1958                 usb_driver_release_interface(driver, intf);
1959         }
1960
1961         return claimintf(ps, dc.interface);
1962 }
1963
1964 /*
1965  * NOTE:  All requests here that have interface numbers as parameters
1966  * are assuming that somehow the configuration has been prevented from
1967  * changing.  But there's no mechanism to ensure that...
1968  */
1969 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1970                                 void __user *p)
1971 {
1972         struct dev_state *ps = file->private_data;
1973         struct inode *inode = file->f_path.dentry->d_inode;
1974         struct usb_device *dev = ps->dev;
1975         int ret = -ENOTTY;
1976
1977         if (!(file->f_mode & FMODE_WRITE))
1978                 return -EPERM;
1979
1980         usb_lock_device(dev);
1981         if (!connected(ps)) {
1982                 usb_unlock_device(dev);
1983                 return -ENODEV;
1984         }
1985
1986         switch (cmd) {
1987         case USBDEVFS_CONTROL:
1988                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1989                 ret = proc_control(ps, p);
1990                 if (ret >= 0)
1991                         inode->i_mtime = CURRENT_TIME;
1992                 break;
1993
1994         case USBDEVFS_BULK:
1995                 snoop(&dev->dev, "%s: BULK\n", __func__);
1996                 ret = proc_bulk(ps, p);
1997                 if (ret >= 0)
1998                         inode->i_mtime = CURRENT_TIME;
1999                 break;
2000
2001         case USBDEVFS_RESETEP:
2002                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2003                 ret = proc_resetep(ps, p);
2004                 if (ret >= 0)
2005                         inode->i_mtime = CURRENT_TIME;
2006                 break;
2007
2008         case USBDEVFS_RESET:
2009                 snoop(&dev->dev, "%s: RESET\n", __func__);
2010                 ret = proc_resetdevice(ps);
2011                 break;
2012
2013         case USBDEVFS_CLEAR_HALT:
2014                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2015                 ret = proc_clearhalt(ps, p);
2016                 if (ret >= 0)
2017                         inode->i_mtime = CURRENT_TIME;
2018                 break;
2019
2020         case USBDEVFS_GETDRIVER:
2021                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2022                 ret = proc_getdriver(ps, p);
2023                 break;
2024
2025         case USBDEVFS_CONNECTINFO:
2026                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2027                 ret = proc_connectinfo(ps, p);
2028                 break;
2029
2030         case USBDEVFS_SETINTERFACE:
2031                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2032                 ret = proc_setintf(ps, p);
2033                 break;
2034
2035         case USBDEVFS_SETCONFIGURATION:
2036                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2037                 ret = proc_setconfig(ps, p);
2038                 break;
2039
2040         case USBDEVFS_SUBMITURB:
2041                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2042                 ret = proc_submiturb(ps, p);
2043                 if (ret >= 0)
2044                         inode->i_mtime = CURRENT_TIME;
2045                 break;
2046
2047 #ifdef CONFIG_COMPAT
2048         case USBDEVFS_CONTROL32:
2049                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2050                 ret = proc_control_compat(ps, p);
2051                 if (ret >= 0)
2052                         inode->i_mtime = CURRENT_TIME;
2053                 break;
2054
2055         case USBDEVFS_BULK32:
2056                 snoop(&dev->dev, "%s: BULK32\n", __func__);
2057                 ret = proc_bulk_compat(ps, p);
2058                 if (ret >= 0)
2059                         inode->i_mtime = CURRENT_TIME;
2060                 break;
2061
2062         case USBDEVFS_DISCSIGNAL32:
2063                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2064                 ret = proc_disconnectsignal_compat(ps, p);
2065                 break;
2066
2067         case USBDEVFS_SUBMITURB32:
2068                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2069                 ret = proc_submiturb_compat(ps, p);
2070                 if (ret >= 0)
2071                         inode->i_mtime = CURRENT_TIME;
2072                 break;
2073
2074         case USBDEVFS_REAPURB32:
2075                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2076                 ret = proc_reapurb_compat(ps, p);
2077                 break;
2078
2079         case USBDEVFS_REAPURBNDELAY32:
2080                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2081                 ret = proc_reapurbnonblock_compat(ps, p);
2082                 break;
2083
2084         case USBDEVFS_IOCTL32:
2085                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2086                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2087                 break;
2088 #endif
2089
2090         case USBDEVFS_DISCARDURB:
2091                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
2092                 ret = proc_unlinkurb(ps, p);
2093                 break;
2094
2095         case USBDEVFS_REAPURB:
2096                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2097                 ret = proc_reapurb(ps, p);
2098                 break;
2099
2100         case USBDEVFS_REAPURBNDELAY:
2101                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2102                 ret = proc_reapurbnonblock(ps, p);
2103                 break;
2104
2105         case USBDEVFS_DISCSIGNAL:
2106                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2107                 ret = proc_disconnectsignal(ps, p);
2108                 break;
2109
2110         case USBDEVFS_CLAIMINTERFACE:
2111                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2112                 ret = proc_claiminterface(ps, p);
2113                 break;
2114
2115         case USBDEVFS_RELEASEINTERFACE:
2116                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2117                 ret = proc_releaseinterface(ps, p);
2118                 break;
2119
2120         case USBDEVFS_IOCTL:
2121                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2122                 ret = proc_ioctl_default(ps, p);
2123                 break;
2124
2125         case USBDEVFS_CLAIM_PORT:
2126                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2127                 ret = proc_claim_port(ps, p);
2128                 break;
2129
2130         case USBDEVFS_RELEASE_PORT:
2131                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2132                 ret = proc_release_port(ps, p);
2133                 break;
2134         case USBDEVFS_GET_CAPABILITIES:
2135                 ret = proc_get_capabilities(ps, p);
2136                 break;
2137         case USBDEVFS_DISCONNECT_CLAIM:
2138                 ret = proc_disconnect_claim(ps, p);
2139                 break;
2140         }
2141         usb_unlock_device(dev);
2142         if (ret >= 0)
2143                 inode->i_atime = CURRENT_TIME;
2144         return ret;
2145 }
2146
2147 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2148                         unsigned long arg)
2149 {
2150         int ret;
2151
2152         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2153
2154         return ret;
2155 }
2156
2157 #ifdef CONFIG_COMPAT
2158 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2159                         unsigned long arg)
2160 {
2161         int ret;
2162
2163         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2164
2165         return ret;
2166 }
2167 #endif
2168
2169 /* No kernel lock - fine */
2170 static unsigned int usbdev_poll(struct file *file,
2171                                 struct poll_table_struct *wait)
2172 {
2173         struct dev_state *ps = file->private_data;
2174         unsigned int mask = 0;
2175
2176         poll_wait(file, &ps->wait, wait);
2177         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2178                 mask |= POLLOUT | POLLWRNORM;
2179         if (!connected(ps))
2180                 mask |= POLLERR | POLLHUP;
2181         return mask;
2182 }
2183
2184 const struct file_operations usbdev_file_operations = {
2185         .owner =          THIS_MODULE,
2186         .llseek =         usbdev_lseek,
2187         .read =           usbdev_read,
2188         .poll =           usbdev_poll,
2189         .unlocked_ioctl = usbdev_ioctl,
2190 #ifdef CONFIG_COMPAT
2191         .compat_ioctl =   usbdev_compat_ioctl,
2192 #endif
2193         .open =           usbdev_open,
2194         .release =        usbdev_release,
2195 };
2196
2197 static void usbdev_remove(struct usb_device *udev)
2198 {
2199         struct dev_state *ps;
2200         struct siginfo sinfo;
2201
2202         while (!list_empty(&udev->filelist)) {
2203                 ps = list_entry(udev->filelist.next, struct dev_state, list);
2204                 destroy_all_async(ps);
2205                 wake_up_all(&ps->wait);
2206                 list_del_init(&ps->list);
2207                 if (ps->discsignr) {
2208                         sinfo.si_signo = ps->discsignr;
2209                         sinfo.si_errno = EPIPE;
2210                         sinfo.si_code = SI_ASYNCIO;
2211                         sinfo.si_addr = ps->disccontext;
2212                         kill_pid_info_as_cred(ps->discsignr, &sinfo,
2213                                         ps->disc_pid, ps->cred, ps->secid);
2214                 }
2215         }
2216 }
2217
2218 static int usbdev_notify(struct notifier_block *self,
2219                                unsigned long action, void *dev)
2220 {
2221         switch (action) {
2222         case USB_DEVICE_ADD:
2223                 break;
2224         case USB_DEVICE_REMOVE:
2225                 usbdev_remove(dev);
2226                 break;
2227         }
2228         return NOTIFY_OK;
2229 }
2230
2231 static struct notifier_block usbdev_nb = {
2232         .notifier_call =        usbdev_notify,
2233 };
2234
2235 static struct cdev usb_device_cdev;
2236
2237 int __init usb_devio_init(void)
2238 {
2239         int retval;
2240
2241         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2242                                         "usb_device");
2243         if (retval) {
2244                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2245                 goto out;
2246         }
2247         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2248         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2249         if (retval) {
2250                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2251                        USB_DEVICE_MAJOR);
2252                 goto error_cdev;
2253         }
2254         usb_register_notify(&usbdev_nb);
2255 out:
2256         return retval;
2257
2258 error_cdev:
2259         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2260         goto out;
2261 }
2262
2263 void usb_devio_cleanup(void)
2264 {
2265         usb_unregister_notify(&usbdev_nb);
2266         cdev_del(&usb_device_cdev);
2267         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2268 }