drivers/usb/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  *  $Id: devio.c,v 1.7 2000/02/01 17:28:48 fliegl Exp $
  23  *
  24  *  This file implements the usbdevfs/x/y files, where
  25  *  x is the bus number and y the device number.
  26  *
  27  *  It allows user space programs/"drivers" to communicate directly
  28  *  with USB devices without intervening kernel driver.
  29  *
  30  *  Revision history
  31  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  32  *    04.01.2000   0.2   Turned into its own filesystem
  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/usb.h>
  44 #include <linux/usbdevice_fs.h>
  45 #include <asm/uaccess.h>
  46
  47
  48 struct async {
  49         struct list_head asynclist;
  50         struct dev_state *ps;
  51         struct task_struct *task;
  52         unsigned int signr;
  53         unsigned int intf;
  54         void *userbuffer;
  55         void *userurb;
  56         struct urb urb;
  57 };
  58
  59 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
  60 {
  61         switch (orig) {
  62         case 0:
  63                 file->f_pos = offset;
  64                 return file->f_pos;
  65
  66         case 1:
  67                 file->f_pos += offset;
  68                 return file->f_pos;
  69
  70         case 2:
  71                 return -EINVAL;
  72
  73         default:
  74                 return -EINVAL;
  75         }
  76 }
  77
  78 static ssize_t usbdev_read(struct file *file, char * buf, size_t nbytes, loff_t *ppos)
  79 {
  80         struct dev_state *ps = (struct dev_state *)file->private_data;
  81         ssize_t ret = 0;
  82         unsigned len;
  83         loff_t pos, last;
  84         int i;
  85
  86         pos = *ppos;
  87         down_read(&ps->devsem);
  88         if (!ps->dev) {
  89                 ret = -ENODEV;
  90                 goto err;
  91         } else if (pos < 0) {
  92                 ret = -EINVAL;
  93                 goto err;
  94         }
  95
  96         if (pos < sizeof(struct usb_device_descriptor)) {
  97                 len = sizeof(struct usb_device_descriptor) - pos;
  98                 if (len > nbytes)
  99                         len = nbytes;
 100                 if (copy_to_user(buf, ((char *)&ps->dev->descriptor) + pos, len)) {
 101                         ret = -EFAULT;
 102                         goto err;
 103                 }
 104
 105                 pos += len;
 106                 buf += len;
 107                 nbytes -= len;
 108                 ret += len;
 109         }
 110
 111         last = sizeof(struct usb_device_descriptor);
 112         for (i = 0; nbytes && i < ps->dev->descriptor.bNumConfigurations; i++) {
 113                 struct usb_config_descriptor *config =
 114                         (struct usb_config_descriptor *)ps->dev->rawdescriptors[i];
 115                 unsigned int length = le16_to_cpu(config->wTotalLength);
 116
 117                 if (pos < last + length) {
 118                         len = length - (pos - last);
 119                         if (len > nbytes)
 120                                 len = nbytes;
 121
 122                         if (copy_to_user(buf,
 123                             ps->dev->rawdescriptors[i] + (pos - last), len)) {
 124                                 ret = -EFAULT;
 125                                 goto err;
 126                         }
 127
 128                         pos += len;
 129                         buf += len;
 130                         nbytes -= len;
 131                         ret += len;
 132                 }
 133
 134                 last += length;
 135         }
 136         *ppos = pos;
 137
 138 err:
 139         up_read(&ps->devsem);
 140         return ret;
 141 }
 142
 143 static inline unsigned int ld2(unsigned int x)
 144 {
 145         unsigned int r = 0;
 146
 147         if (x >= 0x10000) {
 148                 x >>= 16;
 149                 r += 16;
 150         }
 151         if (x >= 0x100) {
 152                 x >>= 8;
 153                 r += 8;
 154         }
 155         if (x >= 0x10) {
 156                 x >>= 4;
 157                 r += 4;
 158         }
 159         if (x >= 4) {
 160                 x >>= 2;
 161                 r += 2;
 162         }
 163         if (x >= 2)
 164                 r++;
 165         return r;
 166 }
 167
 168 /*
 169  * async list handling
 170  */
 171
 172 static struct async *alloc_async(unsigned int numisoframes)
 173 {
 174         unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct iso_packet_descriptor);
 175         struct async *as = kmalloc(assize, GFP_KERNEL);
 176         if (!as)
 177                 return NULL;
 178         memset(as, 0, assize);
 179         as->urb.number_of_packets = numisoframes;
 180         spin_lock_init(&as->urb.lock);
 181         return as;
 182 }
 183
 184 static void free_async(struct async *as)
 185 {
 186         if (as->urb.transfer_buffer)
 187                 kfree(as->urb.transfer_buffer);
 188         if (as->urb.setup_packet)
 189                 kfree(as->urb.setup_packet);
 190         kfree(as);
 191 }
 192
 193 static inline void async_newpending(struct async *as)
 194 {
 195         struct dev_state *ps = as->ps;
 196         unsigned long flags;
 197
 198         spin_lock_irqsave(&ps->lock, flags);
 199         list_add_tail(&as->asynclist, &ps->async_pending);
 200         spin_unlock_irqrestore(&ps->lock, flags);
 201 }
 202
 203 static inline void async_removepending(struct async *as)
 204 {
 205         struct dev_state *ps = as->ps;
 206         unsigned long flags;
 207
 208         spin_lock_irqsave(&ps->lock, flags);
 209         list_del_init(&as->asynclist);
 210         spin_unlock_irqrestore(&ps->lock, flags);
 211 }
 212
 213 static inline struct async *async_getcompleted(struct dev_state *ps)
 214 {
 215         unsigned long flags;
 216         struct async *as = NULL;
 217
 218         spin_lock_irqsave(&ps->lock, flags);
 219         if (!list_empty(&ps->async_completed)) {
 220                 as = list_entry(ps->async_completed.next, struct async, asynclist);
 221                 list_del_init(&as->asynclist);
 222         }
 223         spin_unlock_irqrestore(&ps->lock, flags);
 224         return as;
 225 }
 226
 227 static inline struct async *async_getpending(struct dev_state *ps, void *userurb)
 228 {
 229         unsigned long flags;
 230         struct async *as;
 231
 232         spin_lock_irqsave(&ps->lock, flags);
 233         list_for_each_entry(as, &ps->async_pending, asynclist)
 234                 if (as->userurb == userurb) {
 235                         list_del_init(&as->asynclist);
 236                         spin_unlock_irqrestore(&ps->lock, flags);
 237                         return as;
 238                 }
 239         spin_unlock_irqrestore(&ps->lock, flags);
 240         return NULL;
 241 }
 242
 243 static void async_completed(struct urb *urb)
 244 {
 245         struct async *as = (struct async *)urb->context;
 246         struct dev_state *ps = as->ps;
 247         struct siginfo sinfo;
 248
 249         spin_lock(&ps->lock);
 250         list_move_tail(&as->asynclist, &ps->async_completed);
 251         spin_unlock(&ps->lock);
 252         wake_up(&ps->wait);
 253         if (as->signr) {
 254                 sinfo.si_signo = as->signr;
 255                 sinfo.si_errno = as->urb.status;
 256                 sinfo.si_code = SI_ASYNCIO;
 257                 sinfo.si_addr = as->userurb;
 258                 send_sig_info(as->signr, &sinfo, as->task);
 259         }
 260 }
 261
 262 static void destroy_async (struct dev_state *ps, struct list_head *list)
 263 {
 264         struct async *as;
 265         unsigned long flags;
 266
 267         spin_lock_irqsave(&ps->lock, flags);
 268         while (!list_empty(list)) {
 269                 as = list_entry(list->next, struct async, asynclist);
 270                 list_del_init(&as->asynclist);
 271                 spin_unlock_irqrestore(&ps->lock, flags);
 272                 /* usb_unlink_urb calls the completion handler with status == USB_ST_URB_KILLED */
 273                 usb_unlink_urb(&as->urb);
 274                 spin_lock_irqsave(&ps->lock, flags);
 275         }
 276         spin_unlock_irqrestore(&ps->lock, flags);
 277         while ((as = async_getcompleted(ps)))
 278                 free_async(as);
 279 }
 280
 281 static void destroy_async_on_interface (struct dev_state *ps, unsigned int intf)
 282 {
 283         struct list_head *p, *q, hitlist;
 284         unsigned long flags;
 285
 286         INIT_LIST_HEAD(&hitlist);
 287         spin_lock_irqsave(&ps->lock, flags);
 288         list_for_each_safe(p, q, &ps->async_pending)
 289                 if (intf == list_entry(p, struct async, asynclist)->intf)
 290                         list_move_tail(p, &hitlist);
 291         spin_unlock_irqrestore(&ps->lock, flags);
 292         destroy_async(ps, &hitlist);
 293 }
 294
 295 static inline void destroy_all_async(struct dev_state *ps)
 296 {
 297         destroy_async(ps, &ps->async_pending);
 298 }
 299
 300 /*
 301  * interface claims are made only at the request of user level code,
 302  * which can also release them (explicitly or by closing files).
 303  * they're also undone when devices disconnect.
 304  */
 305
 306 static void *driver_probe(struct usb_device *dev, unsigned int intf,
 307                           const struct usb_device_id *id)
 308 {
 309         return NULL;
 310 }
 311
 312 static void driver_disconnect(struct usb_device *dev, void *context)
 313 {
 314         struct dev_state *ps = (struct dev_state *)context;
 315
 316         if (!ps)
 317                 return;
 318
 319         /* this waits till synchronous requests complete */
 320         down_write (&ps->devsem);
 321
 322         /* prevent new I/O requests */
 323         ps->dev = 0;
 324         ps->ifclaimed = 0;
 325
 326         /* force async requests to complete */
 327         destroy_all_async (ps);
 328
 329         up_write (&ps->devsem);
 330 }
 331
 332 struct usb_driver usbdevfs_driver = {
 333         name:           "usbdevfs",
 334         probe:          driver_probe,
 335         disconnect:     driver_disconnect,
 336 };
 337
 338 static int claimintf(struct dev_state *ps, unsigned int intf)
 339 {
 340         struct usb_device *dev = ps->dev;
 341         struct usb_interface *iface;
 342         int err;
 343
 344         if (intf >= 8*sizeof(ps->ifclaimed) || !dev || intf >= dev->actconfig->bNumInterfaces)
 345                 return -EINVAL;
 346         /* already claimed */
 347         if (test_bit(intf, &ps->ifclaimed))
 348                 return 0;
 349         iface = &dev->actconfig->interface[intf];
 350         err = -EBUSY;
 351         lock_kernel();
 352         if (!usb_interface_claimed(iface)) {
 353                 usb_driver_claim_interface(&usbdevfs_driver, iface, ps);
 354                 set_bit(intf, &ps->ifclaimed);
 355                 err = 0;
 356         }
 357         unlock_kernel();
 358         return err;
 359 }
 360
 361 static int releaseintf(struct dev_state *ps, unsigned int intf)
 362 {
 363         struct usb_device *dev;
 364         struct usb_interface *iface;
 365         int err;
 366
 367         if (intf >= 8*sizeof(ps->ifclaimed))
 368                 return -EINVAL;
 369         err = -EINVAL;
 370         lock_kernel();
 371         dev = ps->dev;
 372         if (dev && test_and_clear_bit(intf, &ps->ifclaimed)) {
 373                 iface = &dev->actconfig->interface[intf];
 374                 usb_driver_release_interface(&usbdevfs_driver, iface);
 375                 err = 0;
 376         }
 377         unlock_kernel();
 378         return err;
 379 }
 380
 381 static int checkintf(struct dev_state *ps, unsigned int intf)
 382 {
 383         if (intf >= 8*sizeof(ps->ifclaimed))
 384                 return -EINVAL;
 385         if (test_bit(intf, &ps->ifclaimed))
 386                 return 0;
 387         /* if not yet claimed, claim it for the driver */
 388         printk(KERN_WARNING "usbdevfs: process %d (%s) did not claim interface %u before use\n",
 389                current->pid, current->comm, intf);
 390         return claimintf(ps, intf);
 391 }
 392
 393 static int findintfep(struct usb_device *dev, unsigned int ep)
 394 {
 395         unsigned int i, j, e;
 396         struct usb_interface *iface;
 397         struct usb_interface_descriptor *alts;
 398         struct usb_endpoint_descriptor *endpt;
 399
 400         if (ep & ~(USB_DIR_IN|0xf))
 401                 return -EINVAL;
 402         for (i = 0; i < dev->actconfig->bNumInterfaces; i++) {
 403                 iface = &dev->actconfig->interface[i];
 404                 for (j = 0; j < iface->num_altsetting; j++) {
 405                         alts = &iface->altsetting[j];
 406                         for (e = 0; e < alts->bNumEndpoints; e++) {
 407                                 endpt = &alts->endpoint[e];
 408                                 if (endpt->bEndpointAddress == ep)
 409                                         return i;
 410                         }
 411                 }
 412         }
 413         return -ENOENT;
 414 }
 415
 416 static int findintfif(struct usb_device *dev, unsigned int ifn)
 417 {
 418         unsigned int i, j;
 419         struct usb_interface *iface;
 420         struct usb_interface_descriptor *alts;
 421
 422         if (ifn & ~0xff)
 423                 return -EINVAL;
 424         for (i = 0; i < dev->actconfig->bNumInterfaces; i++) {
 425                 iface = &dev->actconfig->interface[i];
 426                 for (j = 0; j < iface->num_altsetting; j++) {
 427                         alts = &iface->altsetting[j];
 428                         if (alts->bInterfaceNumber == ifn)
 429                                 return i;
 430                 }
 431         }
 432         return -ENOENT;
 433 }
 434
 435 extern struct list_head usb_driver_list;
 436
 437 #if 0
 438 static int finddriver(struct usb_driver **driver, char *name)
 439 {
 440         struct list_head *tmp;
 441
 442         tmp = usb_driver_list.next;
 443         while (tmp != &usb_driver_list) {
 444                 struct usb_driver *d = list_entry(tmp, struct usb_driver,
 445                                                         driver_list);
 446
 447                 if (!strcmp(d->name, name)) {
 448                         *driver = d;
 449                         return 0;
 450                 }
 451
 452                 tmp = tmp->next;
 453         }
 454
 455         return -EINVAL;
 456 }
 457 #endif
 458
 459 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
 460 {
 461         int ret;
 462
 463         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 464                 return 0;
 465
 466         switch (requesttype & USB_RECIP_MASK) {
 467         case USB_RECIP_ENDPOINT:
 468                 if ((ret = findintfep(ps->dev, index & 0xff)) < 0)
 469                         return ret;
 470                 if ((ret = checkintf(ps, ret)))
 471                         return ret;
 472                 break;
 473
 474         case USB_RECIP_INTERFACE:
 475                 if ((ret = findintfif(ps->dev, index & 0xff)) < 0)
 476                         return ret;
 477                 if ((ret = checkintf(ps, ret)))
 478                         return ret;
 479                 break;
 480         }
 481         return 0;
 482 }
 483
 484 /*
 485  * file operations
 486  */
 487 static int usbdev_open(struct inode *inode, struct file *file)
 488 {
 489         struct usb_device *dev;
 490         struct dev_state *ps;
 491         int ret;
 492
 493         /*
 494          * no locking necessary here, as both sys_open (actually filp_open)
 495          * and the hub thread have the kernel lock
 496          * (still acquire the kernel lock for safety)
 497          */
 498         lock_kernel();
 499         ret = -ENOENT;
 500         if (ITYPE(inode->i_ino) != IDEVICE)
 501                 goto out;
 502         dev = inode->u.usbdev_i.p.dev;
 503         if (!dev)
 504                 goto out;
 505         ret = -ENOMEM;
 506         if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
 507                 goto out;
 508         ret = 0;
 509         ps->dev = dev;
 510         ps->file = file;
 511         spin_lock_init(&ps->lock);
 512         INIT_LIST_HEAD(&ps->async_pending);
 513         INIT_LIST_HEAD(&ps->async_completed);
 514         init_waitqueue_head(&ps->wait);
 515         init_rwsem(&ps->devsem);
 516         ps->discsignr = 0;
 517         ps->disctask = current;
 518         ps->disccontext = NULL;
 519         ps->ifclaimed = 0;
 520         wmb();
 521         list_add_tail(&ps->list, &dev->filelist);
 522         file->private_data = ps;
 523  out:
 524         unlock_kernel();
 525         return ret;
 526 }
 527
 528 static int usbdev_release(struct inode *inode, struct file *file)
 529 {
 530         struct dev_state *ps = (struct dev_state *)file->private_data;
 531         unsigned int i;
 532
 533         lock_kernel();
 534         list_del_init(&ps->list);
 535         if (ps->dev) {
 536                 for (i = 0; ps->ifclaimed && i < 8*sizeof(ps->ifclaimed); i++)
 537                         if (test_bit(i, &ps->ifclaimed))
 538                                 releaseintf(ps, i);
 539         }
 540         unlock_kernel();
 541         destroy_all_async(ps);
 542         kfree(ps);
 543         return 0;
 544 }
 545
 546 static int proc_control(struct dev_state *ps, void *arg)
 547 {
 548         struct usb_device *dev = ps->dev;
 549         struct usbdevfs_ctrltransfer ctrl;
 550         unsigned int tmo;
 551         unsigned char *tbuf;
 552         int i, ret;
 553
 554         if (copy_from_user(&ctrl, (void *)arg, sizeof(ctrl)))
 555                 return -EFAULT;
 556         if ((ret = check_ctrlrecip(ps, ctrl.requesttype, ctrl.index)))
 557                 return ret;
 558         if (ctrl.length > PAGE_SIZE)
 559                 return -EINVAL;
 560         if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
 561                 return -ENOMEM;
 562         tmo = (ctrl.timeout * HZ + 999) / 1000;
 563         if (ctrl.requesttype & 0x80) {
 564                 if (ctrl.length && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.length)) {
 565                         free_page((unsigned long)tbuf);
 566                         return -EINVAL;
 567                 }
 568                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.request, ctrl.requesttype,
 569                                        ctrl.value, ctrl.index, tbuf, ctrl.length, tmo);
 570                 if ((i > 0) && ctrl.length) {
 571                         if (copy_to_user(ctrl.data, tbuf, ctrl.length)) {
 572                                 free_page((unsigned long)tbuf);
 573                                 return -EFAULT;
 574                         }
 575                 }
 576         } else {
 577                 if (ctrl.length) {
 578                         if (copy_from_user(tbuf, ctrl.data, ctrl.length)) {
 579                                 free_page((unsigned long)tbuf);
 580                                 return -EFAULT;
 581                         }
 582                 }
 583                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.request, ctrl.requesttype,
 584                                        ctrl.value, ctrl.index, tbuf, ctrl.length, tmo);
 585         }
 586         free_page((unsigned long)tbuf);
 587         if (i<0) {
 588                 printk(KERN_DEBUG "usbdevfs: USBDEVFS_CONTROL failed dev %d rqt %u rq %u len %u ret %d\n",
 589                        dev->devnum, ctrl.requesttype, ctrl.request, ctrl.length, i);
 590         }
 591         return i;
 592 }
 593
 594 static int proc_bulk(struct dev_state *ps, void *arg)
 595 {
 596         struct usb_device *dev = ps->dev;
 597         struct usbdevfs_bulktransfer bulk;
 598         unsigned int tmo, len1, pipe;
 599         int len2;
 600         unsigned char *tbuf;
 601         int i, ret;
 602
 603         if (copy_from_user(&bulk, (void *)arg, sizeof(bulk)))
 604                 return -EFAULT;
 605         if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
 606                 return ret;
 607         if ((ret = checkintf(ps, ret)))
 608                 return ret;
 609         if (bulk.ep & USB_DIR_IN)
 610                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 611         else
 612                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 613         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 614                 return -EINVAL;
 615         len1 = bulk.len;
 616         if (len1 > PAGE_SIZE)
 617                 return -EINVAL;
 618         if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
 619                 return -ENOMEM;
 620         tmo = (bulk.timeout * HZ + 999) / 1000;
 621         if (bulk.ep & 0x80) {
 622                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 623                         free_page((unsigned long)tbuf);
 624                         return -EINVAL;
 625                 }
 626                 if (usb_excl_lock(dev, 1, 1) != 0) {
 627                         free_page((unsigned long)tbuf);
 628                         return -ERESTARTSYS;
 629                 }
 630                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 631                 usb_excl_unlock(dev, 1);
 632                 if (!i && len2) {
 633                         if (copy_to_user(bulk.data, tbuf, len2)) {
 634                                 free_page((unsigned long)tbuf);
 635                                 return -EFAULT;
 636                         }
 637                 }
 638         } else {
 639                 if (len1) {
 640                         if (copy_from_user(tbuf, bulk.data, len1)) {
 641                                 free_page((unsigned long)tbuf);
 642                                 return -EFAULT;
 643                         }
 644                 }
 645                 if (usb_excl_lock(dev, 2, 1) != 0) {
 646                         free_page((unsigned long)tbuf);
 647                         return -ERESTARTSYS;
 648                 }
 649                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 650                 usb_excl_unlock(dev, 2);
 651         }
 652         free_page((unsigned long)tbuf);
 653         if (i < 0) {
 654                 printk(KERN_WARNING "usbdevfs: USBDEVFS_BULK failed dev %d ep 0x%x len %u ret %d\n",
 655                        dev->devnum, bulk.ep, bulk.len, i);
 656                 return i;
 657         }
 658         return len2;
 659 }
 660
 661 static int proc_resetep(struct dev_state *ps, void *arg)
 662 {
 663         unsigned int ep;
 664         int ret;
 665
 666         if (get_user(ep, (unsigned int *)arg))
 667                 return -EFAULT;
 668         if ((ret = findintfep(ps->dev, ep)) < 0)
 669                 return ret;
 670         if ((ret = checkintf(ps, ret)))
 671                 return ret;
 672         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
 673         return 0;
 674 }
 675
 676 static int proc_clearhalt(struct dev_state *ps, void *arg)
 677 {
 678         unsigned int ep;
 679         int pipe;
 680         int ret;
 681
 682         if (get_user(ep, (unsigned int *)arg))
 683                 return -EFAULT;
 684         if ((ret = findintfep(ps->dev, ep)) < 0)
 685                 return ret;
 686         if ((ret = checkintf(ps, ret)))
 687                 return ret;
 688         if (ep & USB_DIR_IN)
 689                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 690         else
 691                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 692
 693         return usb_clear_halt(ps->dev, pipe);
 694 }
 695
 696
 697 static int proc_getdriver(struct dev_state *ps, void *arg)
 698 {
 699         struct usbdevfs_getdriver gd;
 700         struct usb_interface *interface;
 701         int ret;
 702
 703         if (copy_from_user(&gd, arg, sizeof(gd)))
 704                 return -EFAULT;
 705         if ((ret = findintfif(ps->dev, gd.interface)) < 0)
 706                 return ret;
 707         interface = usb_ifnum_to_if(ps->dev, gd.interface);
 708         if (!interface)
 709                 return -EINVAL;
 710         if (!interface->driver)
 711                 return -ENODATA;
 712         strcpy(gd.driver, interface->driver->name);
 713         if (copy_to_user(arg, &gd, sizeof(gd)))
 714                 return -EFAULT;
 715         return 0;
 716 }
 717
 718 static int proc_connectinfo(struct dev_state *ps, void *arg)
 719 {
 720         struct usbdevfs_connectinfo ci;
 721
 722         ci.devnum = ps->dev->devnum;
 723         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 724         if (copy_to_user(arg, &ci, sizeof(ci)))
 725                 return -EFAULT;
 726         return 0;
 727 }
 728
 729 static int proc_resetdevice(struct dev_state *ps)
 730 {
 731         int i, ret;
 732
 733         ret = usb_reset_device(ps->dev);
 734         if (ret < 0)
 735                 return ret;
 736
 737         for (i = 0; i < ps->dev->actconfig->bNumInterfaces; i++) {
 738                 struct usb_interface *intf = &ps->dev->actconfig->interface[i];
 739
 740                 /* Don't simulate interfaces we've claimed */
 741                 if (test_bit(i, &ps->ifclaimed))
 742                         continue;
 743
 744                 if (intf->driver) {
 745                         const struct usb_device_id *id;
 746                         down(&intf->driver->serialize);
 747                         intf->driver->disconnect(ps->dev, intf->private_data);
 748                         id = usb_match_id(ps->dev,intf,intf->driver->id_table);
 749                         intf->driver->probe(ps->dev, i, id);
 750                         up(&intf->driver->serialize);
 751                 }
 752         }
 753
 754         return 0;
 755 }
 756
 757 static int proc_setintf(struct dev_state *ps, void *arg)
 758 {
 759         struct usbdevfs_setinterface setintf;
 760         struct usb_interface *interface;
 761         int ret;
 762
 763         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 764                 return -EFAULT;
 765         if ((ret = findintfif(ps->dev, setintf.interface)) < 0)
 766                 return ret;
 767         interface = usb_ifnum_to_if(ps->dev, setintf.interface);
 768         if (!interface)
 769                 return -EINVAL;
 770         if (interface->driver) {
 771                 if ((ret = checkintf(ps, ret)))
 772                         return ret;
 773         }
 774         if (usb_set_interface(ps->dev, setintf.interface, setintf.altsetting))
 775                 return -EINVAL;
 776         return 0;
 777 }
 778
 779 static int proc_setconfig(struct dev_state *ps, void *arg)
 780 {
 781         unsigned int u;
 782
 783         if (get_user(u, (unsigned int *)arg))
 784                 return -EFAULT;
 785         if (usb_set_configuration(ps->dev, u) < 0)
 786                 return -EINVAL;
 787         return 0;
 788 }
 789
 790 static int proc_submiturb(struct dev_state *ps, void *arg)
 791 {
 792         struct usbdevfs_urb uurb;
 793         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 794         struct usb_endpoint_descriptor *ep_desc;
 795         struct async *as;
 796         struct usb_ctrlrequest *dr = NULL;
 797         unsigned int u, totlen, isofrmlen;
 798         int ret;
 799         int intf = -1;
 800
 801         if (copy_from_user(&uurb, arg, sizeof(uurb)))
 802                 return -EFAULT;
 803         if (uurb.flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_DISABLE_SPD|USBDEVFS_URB_QUEUE_BULK|
 804                            USB_NO_FSBR|USB_ZERO_PACKET))
 805                 return -EINVAL;
 806         if (!uurb.buffer)
 807                 return -EINVAL;
 808         if (uurb.signr != 0 && (uurb.signr < SIGRTMIN || uurb.signr > SIGRTMAX))
 809                 return -EINVAL;
 810         if (!(uurb.type == USBDEVFS_URB_TYPE_CONTROL && (uurb.endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
 811                 if ((intf = findintfep(ps->dev, uurb.endpoint)) < 0)
 812                         return intf;
 813                 if ((ret = checkintf(ps, intf)))
 814                         return ret;
 815         }
 816         switch(uurb.type) {
 817         case USBDEVFS_URB_TYPE_CONTROL:
 818                 if ((uurb.endpoint & ~USB_ENDPOINT_DIR_MASK) != 0) {
 819                         if (!(ep_desc = usb_epnum_to_ep_desc(ps->dev, uurb.endpoint)))
 820                                 return -ENOENT;
 821                         if ((ep_desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_CONTROL)
 822                                 return -EINVAL;
 823                 }
 824                 /* min 8 byte setup packet, max arbitrary */
 825                 if (uurb.buffer_length < 8 || uurb.buffer_length > PAGE_SIZE)
 826                         return -EINVAL;
 827                 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
 828                         return -ENOMEM;
 829                 if (copy_from_user(dr, (unsigned char*)uurb.buffer, 8)) {
 830                         kfree(dr);
 831                         return -EFAULT;
 832                 }
 833                 if (uurb.buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
 834                         kfree(dr);
 835                         return -EINVAL;
 836                 }
 837                 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
 838                         kfree(dr);
 839                         return ret;
 840                 }
 841                 uurb.endpoint = (uurb.endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK);
 842                 uurb.number_of_packets = 0;
 843                 uurb.buffer_length = le16_to_cpup(&dr->wLength);
 844                 uurb.buffer += 8;
 845                 if (!access_ok((uurb.endpoint & USB_DIR_IN) ?  VERIFY_WRITE : VERIFY_READ, uurb.buffer, uurb.buffer_length)) {
 846                         kfree(dr);
 847                         return -EFAULT;
 848                 }
 849                 break;
 850
 851         case USBDEVFS_URB_TYPE_BULK:
 852                 uurb.number_of_packets = 0;
 853                 if (uurb.buffer_length > 16384)
 854                         return -EINVAL;
 855                 if (!access_ok((uurb.endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb.buffer, uurb.buffer_length))
 856                         return -EFAULT;
 857                 break;
 858
 859         case USBDEVFS_URB_TYPE_ISO:
 860                 /* arbitrary limit */
 861                 if (uurb.number_of_packets < 1 || uurb.number_of_packets > 128)
 862                         return -EINVAL;
 863                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb.number_of_packets;
 864                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
 865                         return -ENOMEM;
 866                 if (copy_from_user(isopkt, &((struct usbdevfs_urb *)arg)->iso_frame_desc, isofrmlen)) {
 867                         kfree(isopkt);
 868                         return -EFAULT;
 869                 }
 870                 for (totlen = u = 0; u < uurb.number_of_packets; u++) {
 871                         if (isopkt[u].length > 1023) {
 872                                 kfree(isopkt);
 873                                 return -EINVAL;
 874                         }
 875                         totlen += isopkt[u].length;
 876                 }
 877                 if (totlen > 32768) {
 878                         kfree(isopkt);
 879                         return -EINVAL;
 880                 }
 881                 uurb.buffer_length = totlen;
 882                 break;
 883
 884         case USBDEVFS_URB_TYPE_INTERRUPT:
 885                 uurb.number_of_packets = 0;
 886                 if (uurb.buffer_length > 16384)
 887                         return -EINVAL;
 888                 if (!access_ok((uurb.endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb.buffer, uurb.buffer_length))
 889                         return -EFAULT;
 890                 break;
 891
 892         default:
 893                 return -EINVAL;
 894         }
 895         if (!(as = alloc_async(uurb.number_of_packets))) {
 896                 if (isopkt)
 897                         kfree(isopkt);
 898                 if (dr)
 899                         kfree(dr);
 900                 return -ENOMEM;
 901         }
 902         if (!(as->urb.transfer_buffer = kmalloc(uurb.buffer_length, GFP_KERNEL))) {
 903                 if (isopkt)
 904                         kfree(isopkt);
 905                 if (dr)
 906                         kfree(dr);
 907                 free_async(as);
 908                 return -ENOMEM;
 909         }
 910         as->urb.next = NULL;
 911         as->urb.dev = ps->dev;
 912         as->urb.pipe = (uurb.type << 30) | __create_pipe(ps->dev, uurb.endpoint & 0xf) | (uurb.endpoint & USB_DIR_IN);
 913         as->urb.transfer_flags = uurb.flags;
 914         as->urb.transfer_buffer_length = uurb.buffer_length;
 915         as->urb.setup_packet = (unsigned char*)dr;
 916         as->urb.start_frame = uurb.start_frame;
 917         as->urb.number_of_packets = uurb.number_of_packets;
 918         as->urb.context = as;
 919         as->urb.complete = async_completed;
 920         for (totlen = u = 0; u < uurb.number_of_packets; u++) {
 921                 as->urb.iso_frame_desc[u].offset = totlen;
 922                 as->urb.iso_frame_desc[u].length = isopkt[u].length;
 923                 totlen += isopkt[u].length;
 924         }
 925         if (isopkt)
 926                 kfree(isopkt);
 927         as->ps = ps;
 928         as->userurb = arg;
 929         if (uurb.endpoint & USB_DIR_IN)
 930                 as->userbuffer = uurb.buffer;
 931         else
 932                 as->userbuffer = NULL;
 933         as->signr = uurb.signr;
 934         as->intf = intf;
 935         as->task = current;
 936         if (!(uurb.endpoint & USB_DIR_IN)) {
 937                 if (copy_from_user(as->urb.transfer_buffer, uurb.buffer, as->urb.transfer_buffer_length)) {
 938                         free_async(as);
 939                         return -EFAULT;
 940                 }
 941         }
 942         async_newpending(as);
 943         if ((ret = usb_submit_urb(&as->urb))) {
 944                 printk(KERN_DEBUG "usbdevfs: usb_submit_urb returned %d\n", ret);
 945                 async_removepending(as);
 946                 free_async(as);
 947                 return ret;
 948         }
 949         return 0;
 950 }
 951
 952 static int proc_unlinkurb(struct dev_state *ps, void *arg)
 953 {
 954         struct async *as;
 955
 956         as = async_getpending(ps, arg);
 957         if (!as)
 958                 return -EINVAL;
 959         usb_unlink_urb(&as->urb);
 960         return 0;
 961 }
 962
 963 static int processcompl(struct async *as)
 964 {
 965         unsigned int i;
 966
 967         if (as->userbuffer)
 968                 if (copy_to_user(as->userbuffer, as->urb.transfer_buffer, as->urb.transfer_buffer_length))
 969                         return -EFAULT;
 970         if (put_user(as->urb.status,
 971                      &((struct usbdevfs_urb *)as->userurb)->status))
 972                 return -EFAULT;
 973         if (put_user(as->urb.actual_length,
 974                      &((struct usbdevfs_urb *)as->userurb)->actual_length))
 975                 return -EFAULT;
 976         if (put_user(as->urb.error_count,
 977                      &((struct usbdevfs_urb *)as->userurb)->error_count))
 978                 return -EFAULT;
 979
 980         if (!(usb_pipeisoc(as->urb.pipe)))
 981                 return 0;
 982         for (i = 0; i < as->urb.number_of_packets; i++) {
 983                 if (put_user(as->urb.iso_frame_desc[i].actual_length,
 984                              &((struct usbdevfs_urb *)as->userurb)->iso_frame_desc[i].actual_length))
 985                         return -EFAULT;
 986                 if (put_user(as->urb.iso_frame_desc[i].status,
 987                              &((struct usbdevfs_urb *)as->userurb)->iso_frame_desc[i].status))
 988                         return -EFAULT;
 989         }
 990         return 0;
 991 }
 992
 993 static int proc_reapurb(struct dev_state *ps, void *arg)
 994 {
 995         DECLARE_WAITQUEUE(wait, current);
 996         struct async *as = NULL;
 997         void *addr;
 998         int ret;
 999
1000         add_wait_queue(&ps->wait, &wait);
1001         while (ps->dev) {
1002                 __set_current_state(TASK_INTERRUPTIBLE);
1003                 if ((as = async_getcompleted(ps)))
1004                         break;
1005                 if (signal_pending(current))
1006                         break;
1007                 up_read(&ps->devsem);
1008                 schedule();
1009                 down_read(&ps->devsem);
1010         }
1011         remove_wait_queue(&ps->wait, &wait);
1012         set_current_state(TASK_RUNNING);
1013         if (as) {
1014                 ret = processcompl(as);
1015                 addr = as->userurb;
1016                 free_async(as);
1017                 if (ret)
1018                         return ret;
1019                 if (put_user(addr, (void **)arg))
1020                         return -EFAULT;
1021                 return 0;
1022         }
1023         if (signal_pending(current))
1024                 return -EINTR;
1025         return -EIO;
1026 }
1027
1028 static int proc_reapurbnonblock(struct dev_state *ps, void *arg)
1029 {
1030         struct async *as;
1031         void *addr;
1032         int ret;
1033
1034         if (!(as = async_getcompleted(ps)))
1035                 return -EAGAIN;
1036         ret = processcompl(as);
1037         addr = as->userurb;
1038         free_async(as);
1039         if (ret)
1040                 return ret;
1041         if (put_user(addr, (void **)arg))
1042                 return -EFAULT;
1043         return 0;
1044 }
1045
1046 static int proc_disconnectsignal(struct dev_state *ps, void *arg)
1047 {
1048         struct usbdevfs_disconnectsignal ds;
1049
1050         if (copy_from_user(&ds, arg, sizeof(ds)))
1051                 return -EFAULT;
1052         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1053                 return -EINVAL;
1054         ps->discsignr = ds.signr;
1055         ps->disccontext = ds.context;
1056         return 0;
1057 }
1058
1059 static int proc_claiminterface(struct dev_state *ps, void *arg)
1060 {
1061         unsigned int intf;
1062         int ret;
1063
1064         if (get_user(intf, (unsigned int *)arg))
1065                 return -EFAULT;
1066         if ((ret = findintfif(ps->dev, intf)) < 0)
1067                 return ret;
1068         return claimintf(ps, ret);
1069 }
1070
1071 static int proc_releaseinterface(struct dev_state *ps, void *arg)
1072 {
1073         unsigned int intf;
1074         int ret;
1075
1076         if (get_user(intf, (unsigned int *)arg))
1077                 return -EFAULT;
1078         if ((ret = findintfif(ps->dev, intf)) < 0)
1079                 return ret;
1080         if ((ret = releaseintf(ps, intf)) < 0)
1081                 return ret;
1082         destroy_async_on_interface (ps, intf);
1083         return 0;
1084 }
1085
1086 static int proc_ioctl (struct dev_state *ps, void *arg)
1087 {
1088         struct usbdevfs_ioctl   ctrl;
1089         int                     size;
1090         void                    *buf = 0;
1091         int                     retval = 0;
1092        struct usb_interface    *ifp = 0;
1093        struct usb_driver       *driver = 0;
1094
1095         /* get input parameters and alloc buffer */
1096         if (copy_from_user(&ctrl, (void *) arg, sizeof (ctrl)))
1097                 return -EFAULT;
1098         if ((size = _IOC_SIZE (ctrl.ioctl_code)) > 0) {
1099                 if ((buf = kmalloc (size, GFP_KERNEL)) == 0)
1100                         return -ENOMEM;
1101                 if ((_IOC_DIR(ctrl.ioctl_code) & _IOC_WRITE)) {
1102                         if (copy_from_user (buf, ctrl.data, size)) {
1103                                 kfree (buf);
1104                                 return -EFAULT;
1105                         }
1106                 } else {
1107                         memset (buf, 0, size);
1108                 }
1109         }
1110
1111        if (!ps->dev)
1112                retval = -ENODEV;
1113        else if (!(ifp = usb_ifnum_to_if (ps->dev, ctrl.ifno)))
1114                retval = -EINVAL;
1115        else switch (ctrl.ioctl_code) {
1116
1117        /* disconnect kernel driver from interface, leaving it unbound.  */
1118        case USBDEVFS_DISCONNECT:
1119                driver = ifp->driver;
1120                if (driver) {
1121                        down (&driver->serialize);
1122                        dbg ("disconnect '%s' from dev %d interface %d",
1123                                driver->name, ps->dev->devnum, ctrl.ifno);
1124                        driver->disconnect (ps->dev, ifp->private_data);
1125                        usb_driver_release_interface (driver, ifp);
1126                        up (&driver->serialize);
1127                } else
1128                        retval = -ENODATA;
1129                break;
1130
1131        /* let kernel drivers try to (re)bind to the interface */
1132        case USBDEVFS_CONNECT:
1133                usb_find_interface_driver_for_ifnum (ps->dev, ctrl.ifno);
1134                break;
1135
1136        /* talk directly to the interface's driver */
1137        default:
1138                driver = ifp->driver;
1139                if (driver == 0 || driver->ioctl == 0)
1140                        retval = -ENOSYS;
1141                 else {
1142                         /* ifno might usefully be passed ... */
1143                        retval = driver->ioctl (ps->dev, ctrl.ioctl_code, buf);
1144                         /* size = min_t(int, size, retval)? */
1145                         if (retval == -ENOIOCTLCMD)
1146                                 retval = -ENOTTY;
1147                }
1148         }
1149
1150         /* cleanup and return */
1151         if (retval >= 0
1152                         && (_IOC_DIR (ctrl.ioctl_code) & _IOC_READ) != 0
1153                         && size > 0
1154                         && copy_to_user (ctrl.data, buf, size) != 0)
1155                 retval = -EFAULT;
1156         if (buf != 0)
1157                 kfree (buf);
1158         return retval;
1159 }
1160
1161 static int usbdev_ioctl_exclusive(struct dev_state *ps, struct inode *inode,
1162                                   unsigned int cmd, unsigned long arg)
1163 {
1164         int ret;
1165
1166         switch (cmd) {
1167         case USBDEVFS_CONTROL:
1168                 ret = proc_control(ps, (void *)arg);
1169                 if (ret >= 0)
1170                         inode->i_mtime = CURRENT_TIME;
1171                 break;
1172
1173         case USBDEVFS_RESETEP:
1174                 ret = proc_resetep(ps, (void *)arg);
1175                 if (ret >= 0)
1176                         inode->i_mtime = CURRENT_TIME;
1177                 break;
1178
1179         case USBDEVFS_RESET:
1180                 ret = proc_resetdevice(ps);
1181                 break;
1182
1183         case USBDEVFS_CLEAR_HALT:
1184                 ret = proc_clearhalt(ps, (void *)arg);
1185                 if (ret >= 0)
1186                         inode->i_mtime = CURRENT_TIME;
1187                 break;
1188
1189         case USBDEVFS_SETINTERFACE:
1190                 ret = proc_setintf(ps, (void *)arg);
1191                 break;
1192
1193         case USBDEVFS_SETCONFIGURATION:
1194                 ret = proc_setconfig(ps, (void *)arg);
1195                 break;
1196
1197         case USBDEVFS_SUBMITURB:
1198                 ret = proc_submiturb(ps, (void *)arg);
1199                 if (ret >= 0)
1200                         inode->i_mtime = CURRENT_TIME;
1201                 break;
1202
1203         case USBDEVFS_DISCARDURB:
1204                 ret = proc_unlinkurb(ps, (void *)arg);
1205                 break;
1206
1207         case USBDEVFS_CLAIMINTERFACE:
1208                 ret = proc_claiminterface(ps, (void *)arg);
1209                 break;
1210
1211         case USBDEVFS_RELEASEINTERFACE:
1212                 ret = proc_releaseinterface(ps, (void *)arg);
1213                 break;
1214
1215         case USBDEVFS_IOCTL:
1216                 ret = proc_ioctl(ps, (void *) arg);
1217                 break;
1218
1219         default:
1220                 ret = -ENOTTY;
1221         }
1222         return ret;
1223 }
1224
1225 static int usbdev_ioctl(struct inode *inode, struct file *file,
1226                         unsigned int cmd, unsigned long arg)
1227 {
1228         struct dev_state *ps = file->private_data;
1229         int ret;
1230
1231         if (!(file->f_mode & FMODE_WRITE))
1232                 return -EPERM;
1233         down_read(&ps->devsem);
1234         if (!ps->dev) {
1235                 up_read(&ps->devsem);
1236                 return -ENODEV;
1237         }
1238
1239         /*
1240          * Some ioctls don't touch the device and can be called without
1241          * grabbing its exclusive_access mutex; they are handled in this
1242          * switch.  Other ioctls which need exclusive_access are handled in
1243          * usbdev_ioctl_exclusive().
1244          */
1245         switch (cmd) {
1246         case USBDEVFS_GETDRIVER:
1247                 ret = proc_getdriver(ps, (void *)arg);
1248                 break;
1249
1250         case USBDEVFS_CONNECTINFO:
1251                 ret = proc_connectinfo(ps, (void *)arg);
1252                 break;
1253
1254         case USBDEVFS_REAPURB:
1255                 ret = proc_reapurb(ps, (void *)arg);
1256                 break;
1257
1258         case USBDEVFS_REAPURBNDELAY:
1259                 ret = proc_reapurbnonblock(ps, (void *)arg);
1260                 break;
1261
1262         case USBDEVFS_DISCSIGNAL:
1263                 ret = proc_disconnectsignal(ps, (void *)arg);
1264                 break;
1265
1266         case USBDEVFS_BULK:
1267                 ret = proc_bulk(ps, (void *)arg);
1268                 if (ret >= 0)
1269                         inode->i_mtime = CURRENT_TIME;
1270                 break;
1271
1272         case USBDEVFS_CONTROL:
1273         case USBDEVFS_RESETEP:
1274         case USBDEVFS_RESET:
1275         case USBDEVFS_CLEAR_HALT:
1276         case USBDEVFS_SETINTERFACE:
1277         case USBDEVFS_SETCONFIGURATION:
1278         case USBDEVFS_SUBMITURB:
1279         case USBDEVFS_DISCARDURB:
1280         case USBDEVFS_CLAIMINTERFACE:
1281         case USBDEVFS_RELEASEINTERFACE:
1282         case USBDEVFS_IOCTL:
1283                 ret = -ERESTARTSYS;
1284                 if (usb_excl_lock(ps->dev, 3, 1) == 0) {
1285                         ret = usbdev_ioctl_exclusive(ps, inode, cmd, arg);
1286                         usb_excl_unlock(ps->dev, 3);
1287                 }
1288                 break;
1289
1290         default:
1291                 ret = -ENOTTY;
1292         }
1293         up_read(&ps->devsem);
1294         if (ret >= 0)
1295                 inode->i_atime = CURRENT_TIME;
1296         return ret;
1297 }
1298
1299 /* No kernel lock - fine */
1300 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
1301 {
1302         struct dev_state *ps = (struct dev_state *)file->private_data;
1303         unsigned int mask = 0;
1304
1305         poll_wait(file, &ps->wait, wait);
1306         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1307                 mask |= POLLOUT | POLLWRNORM;
1308         if (!ps->dev)
1309                 mask |= POLLERR | POLLHUP;
1310         return mask;
1311 }
1312
1313 struct file_operations usbdevfs_device_file_operations = {
1314         llseek:         usbdev_lseek,
1315         read:           usbdev_read,
1316         poll:           usbdev_poll,
1317         ioctl:          usbdev_ioctl,
1318         open:           usbdev_open,
1319         release:        usbdev_release,
1320 };