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  *  $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/module.h>
  44 #include <linux/usb.h>
  45 #include <linux/usbdevice_fs.h>
  46 #include <asm/uaccess.h>
  47 #include <asm/byteorder.h>
  48
  49 #include "hcd.h"        /* for usbcore internals */
  50 #include "usb.h"
  51
  52 struct async {
  53         struct list_head asynclist;
  54         struct dev_state *ps;
  55         struct task_struct *task;
  56         unsigned int signr;
  57         unsigned int intf;
  58         void __user *userbuffer;
  59         void __user *userurb;
  60         struct urb *urb;
  61 };
  62
  63 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
  64 {
  65         loff_t ret;
  66
  67         lock_kernel();
  68
  69         switch (orig) {
  70         case 0:
  71                 file->f_pos = offset;
  72                 ret = file->f_pos;
  73                 break;
  74         case 1:
  75                 file->f_pos += offset;
  76                 ret = file->f_pos;
  77                 break;
  78         case 2:
  79         default:
  80                 ret = -EINVAL;
  81         }
  82
  83         unlock_kernel();
  84         return ret;
  85 }
  86
  87 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
  88 {
  89         struct dev_state *ps = (struct dev_state *)file->private_data;
  90         ssize_t ret = 0;
  91         unsigned len;
  92         loff_t pos;
  93         int i;
  94
  95         pos = *ppos;
  96         down_read(&ps->devsem);
  97         if (!ps->dev) {
  98                 ret = -ENODEV;
  99                 goto err;
 100         } else if (pos < 0) {
 101                 ret = -EINVAL;
 102                 goto err;
 103         }
 104
 105         if (pos < sizeof(struct usb_device_descriptor)) {
 106                 len = sizeof(struct usb_device_descriptor) - pos;
 107                 if (len > nbytes)
 108                         len = nbytes;
 109                 if (copy_to_user(buf, ((char *)&ps->dev->descriptor) + pos, len)) {
 110                         ret = -EFAULT;
 111                         goto err;
 112                 }
 113
 114                 *ppos += len;
 115                 buf += len;
 116                 nbytes -= len;
 117                 ret += len;
 118         }
 119
 120         pos = sizeof(struct usb_device_descriptor);
 121         for (i = 0; nbytes && i < ps->dev->descriptor.bNumConfigurations; i++) {
 122                 struct usb_config_descriptor *config =
 123                         (struct usb_config_descriptor *)ps->dev->rawdescriptors[i];
 124                 unsigned int length = le16_to_cpu(config->wTotalLength);
 125
 126                 if (*ppos < pos + length) {
 127
 128                         /* The descriptor may claim to be longer than it
 129                          * really is.  Here is the actual allocated length. */
 130                         unsigned alloclen =
 131                                 ps->dev->config[i].desc.wTotalLength;
 132
 133                         len = length - (*ppos - pos);
 134                         if (len > nbytes)
 135                                 len = nbytes;
 136
 137                         /* Simply don't write (skip over) unallocated parts */
 138                         if (alloclen > (*ppos - pos)) {
 139                                 alloclen -= (*ppos - pos);
 140                                 if (copy_to_user(buf,
 141                                     ps->dev->rawdescriptors[i] + (*ppos - pos),
 142                                     min(len, alloclen))) {
 143                                         ret = -EFAULT;
 144                                         goto err;
 145                                 }
 146                         }
 147
 148                         *ppos += len;
 149                         buf += len;
 150                         nbytes -= len;
 151                         ret += len;
 152                 }
 153
 154                 pos += length;
 155         }
 156
 157 err:
 158         up_read(&ps->devsem);
 159         return ret;
 160 }
 161
 162 extern inline unsigned int ld2(unsigned int x)
 163 {
 164         unsigned int r = 0;
 165
 166         if (x >= 0x10000) {
 167                 x >>= 16;
 168                 r += 16;
 169         }
 170         if (x >= 0x100) {
 171                 x >>= 8;
 172                 r += 8;
 173         }
 174         if (x >= 0x10) {
 175                 x >>= 4;
 176                 r += 4;
 177         }
 178         if (x >= 4) {
 179                 x >>= 2;
 180                 r += 2;
 181         }
 182         if (x >= 2)
 183                 r++;
 184         return r;
 185 }
 186
 187 /*
 188  * async list handling
 189  */
 190
 191 static struct async *alloc_async(unsigned int numisoframes)
 192 {
 193         unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor);
 194         struct async *as = kmalloc(assize, GFP_KERNEL);
 195         if (!as)
 196                 return NULL;
 197         memset(as, 0, assize);
 198         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 199         if (!as->urb) {
 200                 kfree(as);
 201                 return NULL;
 202         }
 203         return as;
 204 }
 205
 206 static void free_async(struct async *as)
 207 {
 208         if (as->urb->transfer_buffer)
 209                 kfree(as->urb->transfer_buffer);
 210         if (as->urb->setup_packet)
 211                 kfree(as->urb->setup_packet);
 212         usb_free_urb(as->urb);
 213         kfree(as);
 214 }
 215
 216 extern __inline__ void async_newpending(struct async *as)
 217 {
 218         struct dev_state *ps = as->ps;
 219         unsigned long flags;
 220
 221         spin_lock_irqsave(&ps->lock, flags);
 222         list_add_tail(&as->asynclist, &ps->async_pending);
 223         spin_unlock_irqrestore(&ps->lock, flags);
 224 }
 225
 226 extern __inline__ void async_removepending(struct async *as)
 227 {
 228         struct dev_state *ps = as->ps;
 229         unsigned long flags;
 230
 231         spin_lock_irqsave(&ps->lock, flags);
 232         list_del_init(&as->asynclist);
 233         spin_unlock_irqrestore(&ps->lock, flags);
 234 }
 235
 236 extern __inline__ struct async *async_getcompleted(struct dev_state *ps)
 237 {
 238         unsigned long flags;
 239         struct async *as = NULL;
 240
 241         spin_lock_irqsave(&ps->lock, flags);
 242         if (!list_empty(&ps->async_completed)) {
 243                 as = list_entry(ps->async_completed.next, struct async, asynclist);
 244                 list_del_init(&as->asynclist);
 245         }
 246         spin_unlock_irqrestore(&ps->lock, flags);
 247         return as;
 248 }
 249
 250 extern __inline__ struct async *async_getpending(struct dev_state *ps, void __user *userurb)
 251 {
 252         unsigned long flags;
 253         struct async *as;
 254
 255         spin_lock_irqsave(&ps->lock, flags);
 256         list_for_each_entry(as, &ps->async_pending, asynclist)
 257                 if (as->userurb == userurb) {
 258                         list_del_init(&as->asynclist);
 259                         spin_unlock_irqrestore(&ps->lock, flags);
 260                         return as;
 261                 }
 262         spin_unlock_irqrestore(&ps->lock, flags);
 263         return NULL;
 264 }
 265
 266 static void async_completed(struct urb *urb, struct pt_regs *regs)
 267 {
 268         struct async *as = (struct async *)urb->context;
 269         struct dev_state *ps = as->ps;
 270         struct siginfo sinfo;
 271
 272         spin_lock(&ps->lock);
 273         list_move_tail(&as->asynclist, &ps->async_completed);
 274         spin_unlock(&ps->lock);
 275         if (as->signr) {
 276                 sinfo.si_signo = as->signr;
 277                 sinfo.si_errno = as->urb->status;
 278                 sinfo.si_code = SI_ASYNCIO;
 279                 sinfo.si_addr = (void *)as->userurb;
 280                 send_sig_info(as->signr, &sinfo, as->task);
 281         }
 282         wake_up(&ps->wait);
 283 }
 284
 285 static void destroy_async (struct dev_state *ps, struct list_head *list)
 286 {
 287         struct async *as;
 288         unsigned long flags;
 289
 290         spin_lock_irqsave(&ps->lock, flags);
 291         while (!list_empty(list)) {
 292                 as = list_entry(list->next, struct async, asynclist);
 293                 list_del_init(&as->asynclist);
 294                 spin_unlock_irqrestore(&ps->lock, flags);
 295                 /* usb_unlink_urb calls the completion handler with status == -ENOENT */
 296                 usb_unlink_urb(as->urb);
 297                 spin_lock_irqsave(&ps->lock, flags);
 298         }
 299         spin_unlock_irqrestore(&ps->lock, flags);
 300         while ((as = async_getcompleted(ps)))
 301                 free_async(as);
 302 }
 303
 304 static void destroy_async_on_interface (struct dev_state *ps, unsigned int intf)
 305 {
 306         struct list_head *p, *q, hitlist;
 307         unsigned long flags;
 308
 309         INIT_LIST_HEAD(&hitlist);
 310         spin_lock_irqsave(&ps->lock, flags);
 311         list_for_each_safe(p, q, &ps->async_pending)
 312                 if (intf == list_entry(p, struct async, asynclist)->intf)
 313                         list_move_tail(p, &hitlist);
 314         spin_unlock_irqrestore(&ps->lock, flags);
 315         destroy_async(ps, &hitlist);
 316 }
 317
 318 extern __inline__ void destroy_all_async(struct dev_state *ps)
 319 {
 320                 destroy_async(ps, &ps->async_pending);
 321 }
 322
 323 /*
 324  * interface claims are made only at the request of user level code,
 325  * which can also release them (explicitly or by closing files).
 326  * they're also undone when devices disconnect.
 327  */
 328
 329 static int driver_probe (struct usb_interface *intf,
 330                          const struct usb_device_id *id)
 331 {
 332         return -ENODEV;
 333 }
 334
 335 static void driver_disconnect(struct usb_interface *intf)
 336 {
 337         struct dev_state *ps = usb_get_intfdata (intf);
 338
 339         if (!ps)
 340                 return;
 341
 342         /* NOTE:  this relies on usbcore having canceled and completed
 343          * all pending I/O requests; 2.6 does that.
 344          */
 345
 346         /* prevent new I/O requests */
 347         ps->dev = 0;
 348         clear_bit(intf->cur_altsetting->desc.bInterfaceNumber, &ps->ifclaimed);
 349         usb_set_intfdata (intf, NULL);
 350
 351         /* force async requests to complete */
 352         destroy_all_async (ps);
 353 }
 354
 355 struct usb_driver usbdevfs_driver = {
 356         .owner =        THIS_MODULE,
 357         .name =         "usbfs",
 358         .probe =        driver_probe,
 359         .disconnect =   driver_disconnect,
 360 };
 361
 362 static int claimintf(struct dev_state *ps, unsigned int intf)
 363 {
 364         struct usb_device *dev = ps->dev;
 365         struct usb_interface *iface;
 366         int err;
 367
 368         if (intf >= 8*sizeof(ps->ifclaimed) || !dev
 369                         || intf >= dev->actconfig->desc.bNumInterfaces)
 370                 return -EINVAL;
 371         /* already claimed */
 372         if (test_bit(intf, &ps->ifclaimed))
 373                 return 0;
 374         iface = dev->actconfig->interface[intf];
 375         err = -EBUSY;
 376
 377         /* lock against other changes to driver bindings */
 378         down_write(&usb_bus_type.subsys.rwsem);
 379         if (!usb_interface_claimed(iface)) {
 380                 usb_driver_claim_interface(&usbdevfs_driver, iface, ps);
 381                 set_bit(intf, &ps->ifclaimed);
 382                 err = 0;
 383         }
 384         up_write(&usb_bus_type.subsys.rwsem);
 385         return err;
 386 }
 387
 388 static int releaseintf(struct dev_state *ps, unsigned int intf)
 389 {
 390         struct usb_device *dev;
 391         struct usb_interface *iface;
 392         int err;
 393
 394         if (intf >= 8*sizeof(ps->ifclaimed))
 395                 return -EINVAL;
 396         err = -EINVAL;
 397         dev = ps->dev;
 398         down(&dev->serialize);
 399         /* lock against other changes to driver bindings */
 400         down_write(&usb_bus_type.subsys.rwsem);
 401         if (test_and_clear_bit(intf, &ps->ifclaimed)) {
 402                 iface = dev->actconfig->interface[intf];
 403                 usb_driver_release_interface(&usbdevfs_driver, iface);
 404                 err = 0;
 405         }
 406         up_write(&usb_bus_type.subsys.rwsem);
 407         up(&dev->serialize);
 408         return err;
 409 }
 410
 411 static int checkintf(struct dev_state *ps, unsigned int intf)
 412 {
 413         if (intf >= 8*sizeof(ps->ifclaimed))
 414                 return -EINVAL;
 415         if (test_bit(intf, &ps->ifclaimed))
 416                 return 0;
 417         /* if not yet claimed, claim it for the driver */
 418         printk(KERN_WARNING "usbfs: process %d (%s) did not claim interface %u before use\n",
 419                current->pid, current->comm, intf);
 420         return claimintf(ps, intf);
 421 }
 422
 423 static int findintfep(struct usb_device *dev, unsigned int ep)
 424 {
 425         unsigned int i, j, e;
 426         struct usb_interface *iface;
 427         struct usb_host_interface *alts;
 428         struct usb_endpoint_descriptor *endpt;
 429
 430         if (ep & ~(USB_DIR_IN|0xf))
 431                 return -EINVAL;
 432         if (!dev->actconfig)
 433                 return -ESRCH;
 434         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 435                 iface = dev->actconfig->interface[i];
 436                 for (j = 0; j < iface->num_altsetting; j++) {
 437                         alts = &iface->altsetting[j];
 438                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 439                                 endpt = &alts->endpoint[e].desc;
 440                                 if (endpt->bEndpointAddress == ep)
 441                                         return i;
 442                         }
 443                 }
 444         }
 445         return -ENOENT;
 446 }
 447
 448 static int findintfif(struct usb_device *dev, unsigned int ifn)
 449 {
 450         unsigned int i;
 451
 452         if (ifn & ~0xff)
 453                 return -EINVAL;
 454         if (!dev->actconfig)
 455                 return -ESRCH;
 456         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 457                 if (dev->actconfig->interface[i]->
 458                                 altsetting[0].desc.bInterfaceNumber == ifn)
 459                         return i;
 460         }
 461         return -ENOENT;
 462 }
 463
 464 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
 465 {
 466         int ret;
 467
 468         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 469                 return 0;
 470
 471         switch (requesttype & USB_RECIP_MASK) {
 472         case USB_RECIP_ENDPOINT:
 473                 if ((ret = findintfep(ps->dev, index & 0xff)) < 0)
 474                         return ret;
 475                 if ((ret = checkintf(ps, ret)))
 476                         return ret;
 477                 break;
 478
 479         case USB_RECIP_INTERFACE:
 480                 if ((ret = findintfif(ps->dev, index & 0xff)) < 0)
 481                         return ret;
 482                 if ((ret = checkintf(ps, ret)))
 483                         return ret;
 484                 break;
 485         }
 486         return 0;
 487 }
 488
 489 /*
 490  * file operations
 491  */
 492 static int usbdev_open(struct inode *inode, struct file *file)
 493 {
 494         struct usb_device *dev;
 495         struct dev_state *ps;
 496         int ret;
 497
 498         /*
 499          * no locking necessary here, as both sys_open (actually filp_open)
 500          * and the hub thread have the kernel lock
 501          * (still acquire the kernel lock for safety)
 502          */
 503         ret = -ENOMEM;
 504         if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
 505                 goto out_nolock;
 506
 507         lock_kernel();
 508         ret = -ENOENT;
 509         dev = inode->u.generic_ip;
 510         if (!dev) {
 511                 kfree(ps);
 512                 goto out;
 513         }
 514         ret = 0;
 515         ps->dev = dev;
 516         ps->file = file;
 517         spin_lock_init(&ps->lock);
 518         INIT_LIST_HEAD(&ps->async_pending);
 519         INIT_LIST_HEAD(&ps->async_completed);
 520         init_waitqueue_head(&ps->wait);
 521         init_rwsem(&ps->devsem);
 522         ps->discsignr = 0;
 523         ps->disctask = current;
 524         ps->disccontext = NULL;
 525         ps->ifclaimed = 0;
 526         wmb();
 527         list_add_tail(&ps->list, &dev->filelist);
 528         file->private_data = ps;
 529  out:
 530         unlock_kernel();
 531  out_nolock:
 532         return ret;
 533 }
 534
 535 static int usbdev_release(struct inode *inode, struct file *file)
 536 {
 537         struct dev_state *ps = (struct dev_state *)file->private_data;
 538         unsigned int i;
 539
 540         lock_kernel();
 541         list_del_init(&ps->list);
 542
 543         if (ps->dev) {
 544                 for (i = 0; ps->ifclaimed && i < 8*sizeof(ps->ifclaimed); i++)
 545                         if (test_bit(i, &ps->ifclaimed))
 546                                 releaseintf(ps, i);
 547         }
 548         unlock_kernel();
 549         destroy_all_async(ps);
 550         kfree(ps);
 551         return 0;
 552 }
 553
 554 static int proc_control(struct dev_state *ps, void __user *arg)
 555 {
 556         struct usb_device *dev = ps->dev;
 557         struct usbdevfs_ctrltransfer ctrl;
 558         unsigned int tmo;
 559         unsigned char *tbuf;
 560         int i, ret;
 561
 562         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 563                 return -EFAULT;
 564         if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
 565                 return ret;
 566         if (ctrl.wLength > PAGE_SIZE)
 567                 return -EINVAL;
 568         if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
 569                 return -ENOMEM;
 570         tmo = (ctrl.timeout * HZ + 999) / 1000;
 571         if (ctrl.bRequestType & 0x80) {
 572                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
 573                         free_page((unsigned long)tbuf);
 574                         return -EINVAL;
 575                 }
 576                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 577                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 578                 if ((i > 0) && ctrl.wLength) {
 579                         if (copy_to_user(ctrl.data, tbuf, ctrl.wLength)) {
 580                                 free_page((unsigned long)tbuf);
 581                                 return -EFAULT;
 582                         }
 583                 }
 584         } else {
 585                 if (ctrl.wLength) {
 586                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 587                                 free_page((unsigned long)tbuf);
 588                                 return -EFAULT;
 589                         }
 590                 }
 591                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 592                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 593         }
 594         free_page((unsigned long)tbuf);
 595         if (i<0) {
 596                 printk(KERN_DEBUG "usbfs: USBDEVFS_CONTROL failed "
 597                         "cmd %s dev %d rqt %u rq %u len %u ret %d\n",
 598                         current->comm,
 599                        dev->devnum, ctrl.bRequestType, ctrl.bRequest, ctrl.wLength, i);
 600         }
 601         return i;
 602 }
 603
 604 static int proc_bulk(struct dev_state *ps, void __user *arg)
 605 {
 606         struct usb_device *dev = ps->dev;
 607         struct usbdevfs_bulktransfer bulk;
 608         unsigned int tmo, len1, pipe;
 609         int len2;
 610         unsigned char *tbuf;
 611         int i, ret;
 612
 613         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 614                 return -EFAULT;
 615         if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
 616                 return ret;
 617         if ((ret = checkintf(ps, ret)))
 618                 return ret;
 619         if (bulk.ep & USB_DIR_IN)
 620                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 621         else
 622                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 623         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 624                 return -EINVAL;
 625         len1 = bulk.len;
 626         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 627                 return -ENOMEM;
 628         tmo = (bulk.timeout * HZ + 999) / 1000;
 629         if (bulk.ep & 0x80) {
 630                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 631                         kfree(tbuf);
 632                         return -EINVAL;
 633                 }
 634                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 635                 if (!i && len2) {
 636                         if (copy_to_user(bulk.data, tbuf, len2)) {
 637                                 kfree(tbuf);
 638                                 return -EFAULT;
 639                         }
 640                 }
 641         } else {
 642                 if (len1) {
 643                         if (copy_from_user(tbuf, bulk.data, len1)) {
 644                                 kfree(tbuf);
 645                                 return -EFAULT;
 646                         }
 647                 }
 648                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 649         }
 650         kfree(tbuf);
 651         if (i < 0) {
 652                 printk(KERN_WARNING "usbfs: USBDEVFS_BULK failed dev %d ep 0x%x len %u ret %d\n",
 653                        dev->devnum, bulk.ep, bulk.len, i);
 654                 return i;
 655         }
 656         return len2;
 657 }
 658
 659 static int proc_resetep(struct dev_state *ps, void __user *arg)
 660 {
 661         unsigned int ep;
 662         int ret;
 663
 664         if (get_user(ep, (unsigned int __user *)arg))
 665                 return -EFAULT;
 666         if ((ret = findintfep(ps->dev, ep)) < 0)
 667                 return ret;
 668         if ((ret = checkintf(ps, ret)))
 669                 return ret;
 670         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
 671         return 0;
 672 }
 673
 674 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 675 {
 676         unsigned int ep;
 677         int pipe;
 678         int ret;
 679
 680         if (get_user(ep, (unsigned int __user *)arg))
 681                 return -EFAULT;
 682         if ((ret = findintfep(ps->dev, ep)) < 0)
 683                 return ret;
 684         if ((ret = checkintf(ps, ret)))
 685                 return ret;
 686         if (ep & USB_DIR_IN)
 687                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 688         else
 689                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 690
 691         return usb_clear_halt(ps->dev, pipe);
 692 }
 693
 694
 695 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 696 {
 697         struct usbdevfs_getdriver gd;
 698         struct usb_interface *interface;
 699         int ret;
 700
 701         if (copy_from_user(&gd, arg, sizeof(gd)))
 702                 return -EFAULT;
 703         if ((ret = findintfif(ps->dev, gd.interface)) < 0)
 704                 return ret;
 705         interface = ps->dev->actconfig->interface[ret];
 706         if (!interface->dev.driver)
 707                 return -ENODATA;
 708         strncpy(gd.driver, interface->dev.driver->name, sizeof(gd.driver));
 709         if (copy_to_user(arg, &gd, sizeof(gd)))
 710                 return -EFAULT;
 711         return 0;
 712 }
 713
 714 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 715 {
 716         struct usbdevfs_connectinfo ci;
 717
 718         ci.devnum = ps->dev->devnum;
 719         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 720         if (copy_to_user(arg, &ci, sizeof(ci)))
 721                 return -EFAULT;
 722         return 0;
 723 }
 724
 725 static int proc_resetdevice(struct dev_state *ps)
 726 {
 727         /* FIXME when usb_reset_device() is fixed we'll need to grab
 728          * ps->dev->serialize before calling it.
 729          */
 730         return usb_reset_device(ps->dev);
 731
 732 }
 733
 734 static int proc_setintf(struct dev_state *ps, void __user *arg)
 735 {
 736         struct usbdevfs_setinterface setintf;
 737         struct usb_interface *interface;
 738         int ret;
 739
 740         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 741                 return -EFAULT;
 742         if ((ret = findintfif(ps->dev, setintf.interface)) < 0)
 743                 return ret;
 744         interface = ps->dev->actconfig->interface[ret];
 745         if (interface->dev.driver) {
 746                 if ((ret = checkintf(ps, ret)))
 747                         return ret;
 748         }
 749         if (usb_set_interface(ps->dev, setintf.interface, setintf.altsetting))
 750                 return -EINVAL;
 751         return 0;
 752 }
 753
 754 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 755 {
 756         unsigned int u;
 757         int status = 0;
 758         struct usb_host_config *actconfig;
 759
 760         if (get_user(u, (unsigned int __user *)arg))
 761                 return -EFAULT;
 762
 763         down(&ps->dev->serialize);
 764         actconfig = ps->dev->actconfig;
 765
 766         /* Don't touch the device if any interfaces are claimed.
 767          * It could interfere with other drivers' operations, and if
 768          * an interface is claimed by usbfs it could easily deadlock.
 769          */
 770         if (actconfig) {
 771                 int i;
 772
 773                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 774                         if (usb_interface_claimed(actconfig->interface[i])) {
 775                                 dev_warn (&ps->dev->dev,
 776                                         "usbfs: interface %d claimed "
 777                                         "while '%s' sets config #%d\n",
 778                                         actconfig->interface[i]
 779                                                 ->cur_altsetting
 780                                                 ->desc.bInterfaceNumber,
 781                                         current->comm, u);
 782 #if 0   /* FIXME:  enable in 2.6.10 or so */
 783                                 status = -EBUSY;
 784                                 break;
 785 #endif
 786                         }
 787                 }
 788         }
 789
 790         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 791          * so avoid usb_set_configuration()'s kick to sysfs
 792          */
 793         if (status == 0) {
 794                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 795                         status = usb_reset_configuration(ps->dev);
 796                 else
 797                         status = usb_set_configuration(ps->dev, u);
 798         }
 799         up(&ps->dev->serialize);
 800
 801         return status;
 802 }
 803
 804 static int proc_submiturb(struct dev_state *ps, void __user *arg)
 805 {
 806         struct usbdevfs_urb uurb;
 807         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 808         struct usb_endpoint_descriptor *ep_desc;
 809         struct async *as;
 810         struct usb_ctrlrequest *dr = NULL;
 811         unsigned int u, totlen, isofrmlen;
 812         int ret, interval = 0, intf = -1;
 813
 814         if (copy_from_user(&uurb, arg, sizeof(uurb)))
 815                 return -EFAULT;
 816         if (uurb.flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
 817                            URB_NO_FSBR|URB_ZERO_PACKET))
 818                 return -EINVAL;
 819         if (!uurb.buffer)
 820                 return -EINVAL;
 821         if (uurb.signr != 0 && (uurb.signr < SIGRTMIN || uurb.signr > SIGRTMAX))
 822                 return -EINVAL;
 823         if (!(uurb.type == USBDEVFS_URB_TYPE_CONTROL && (uurb.endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
 824                 if ((intf = findintfep(ps->dev, uurb.endpoint)) < 0)
 825                         return intf;
 826                 if ((ret = checkintf(ps, intf)))
 827                         return ret;
 828         }
 829         switch(uurb.type) {
 830         case USBDEVFS_URB_TYPE_CONTROL:
 831                 if ((uurb.endpoint & ~USB_ENDPOINT_DIR_MASK) != 0) {
 832                         if (!(ep_desc = usb_epnum_to_ep_desc(ps->dev, uurb.endpoint)))
 833                                 return -ENOENT;
 834                         if ((ep_desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_CONTROL)
 835                                 return -EINVAL;
 836                 }
 837                 /* min 8 byte setup packet, max arbitrary */
 838                 if (uurb.buffer_length < 8 || uurb.buffer_length > PAGE_SIZE)
 839                         return -EINVAL;
 840                 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
 841                         return -ENOMEM;
 842                 if (copy_from_user(dr, uurb.buffer, 8)) {
 843                         kfree(dr);
 844                         return -EFAULT;
 845                 }
 846                 if (uurb.buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
 847                         kfree(dr);
 848                         return -EINVAL;
 849                 }
 850                 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
 851                         kfree(dr);
 852                         return ret;
 853                 }
 854                 uurb.endpoint = (uurb.endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK);
 855                 uurb.number_of_packets = 0;
 856                 uurb.buffer_length = le16_to_cpup(&dr->wLength);
 857                 uurb.buffer += 8;
 858                 if (!access_ok((uurb.endpoint & USB_DIR_IN) ?  VERIFY_WRITE : VERIFY_READ, uurb.buffer, uurb.buffer_length)) {
 859                         kfree(dr);
 860                         return -EFAULT;
 861                 }
 862                 break;
 863
 864         case USBDEVFS_URB_TYPE_BULK:
 865                 uurb.number_of_packets = 0;
 866                 if (uurb.buffer_length > 16384)
 867                         return -EINVAL;
 868                 if (!access_ok((uurb.endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb.buffer, uurb.buffer_length))
 869                         return -EFAULT;
 870                 break;
 871
 872         case USBDEVFS_URB_TYPE_ISO:
 873                 /* arbitrary limit */
 874                 if (uurb.number_of_packets < 1 || uurb.number_of_packets > 128)
 875                         return -EINVAL;
 876                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb.number_of_packets;
 877                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
 878                         return -ENOMEM;
 879                 if (copy_from_user(isopkt, &((struct usbdevfs_urb *)arg)->iso_frame_desc, isofrmlen)) {
 880                         kfree(isopkt);
 881                         return -EFAULT;
 882                 }
 883                 for (totlen = u = 0; u < uurb.number_of_packets; u++) {
 884                         if (isopkt[u].length > 1023) {
 885                                 kfree(isopkt);
 886                                 return -EINVAL;
 887                         }
 888                         totlen += isopkt[u].length;
 889                 }
 890                 if (totlen > 32768) {
 891                         kfree(isopkt);
 892                         return -EINVAL;
 893                 }
 894                 uurb.buffer_length = totlen;
 895                 break;
 896
 897         case USBDEVFS_URB_TYPE_INTERRUPT:
 898                 uurb.number_of_packets = 0;
 899                 if (!(ep_desc = usb_epnum_to_ep_desc(ps->dev, uurb.endpoint)))
 900                         return -ENOENT;
 901                 interval = ep_desc->bInterval;
 902                 if (uurb.buffer_length > 16384)
 903                         return -EINVAL;
 904                 if (!access_ok((uurb.endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb.buffer, uurb.buffer_length))
 905                         return -EFAULT;
 906                 break;
 907
 908         default:
 909                 return -EINVAL;
 910         }
 911         if (!(as = alloc_async(uurb.number_of_packets))) {
 912                 if (isopkt)
 913                         kfree(isopkt);
 914                 if (dr)
 915                         kfree(dr);
 916                 return -ENOMEM;
 917         }
 918         if (!(as->urb->transfer_buffer = kmalloc(uurb.buffer_length, GFP_KERNEL))) {
 919                 if (isopkt)
 920                         kfree(isopkt);
 921                 if (dr)
 922                         kfree(dr);
 923                 free_async(as);
 924                 return -ENOMEM;
 925         }
 926         as->urb->dev = ps->dev;
 927         as->urb->pipe = (uurb.type << 30) | __create_pipe(ps->dev, uurb.endpoint & 0xf) | (uurb.endpoint & USB_DIR_IN);
 928         as->urb->transfer_flags = uurb.flags;
 929         as->urb->transfer_buffer_length = uurb.buffer_length;
 930         as->urb->setup_packet = (unsigned char*)dr;
 931         as->urb->start_frame = uurb.start_frame;
 932         as->urb->number_of_packets = uurb.number_of_packets;
 933         as->urb->interval = interval;
 934         as->urb->context = as;
 935         as->urb->complete = async_completed;
 936         for (totlen = u = 0; u < uurb.number_of_packets; u++) {
 937                 as->urb->iso_frame_desc[u].offset = totlen;
 938                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
 939                 totlen += isopkt[u].length;
 940         }
 941         if (isopkt)
 942                 kfree(isopkt);
 943         as->ps = ps;
 944         as->userurb = arg;
 945         if (uurb.endpoint & USB_DIR_IN)
 946                 as->userbuffer = uurb.buffer;
 947         else
 948                 as->userbuffer = NULL;
 949         as->signr = uurb.signr;
 950         as->intf = intf;
 951         as->task = current;
 952         if (!(uurb.endpoint & USB_DIR_IN)) {
 953                 if (copy_from_user(as->urb->transfer_buffer, uurb.buffer, as->urb->transfer_buffer_length)) {
 954                         free_async(as);
 955                         return -EFAULT;
 956                 }
 957         }
 958         async_newpending(as);
 959         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
 960                 printk(KERN_DEBUG "usbfs: usb_submit_urb returned %d\n", ret);
 961                 async_removepending(as);
 962                 free_async(as);
 963                 return ret;
 964         }
 965         return 0;
 966 }
 967
 968 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
 969 {
 970         struct async *as;
 971
 972         as = async_getpending(ps, arg);
 973         if (!as)
 974                 return -EINVAL;
 975         usb_unlink_urb(as->urb);
 976         return 0;
 977 }
 978
 979 static int processcompl(struct async *as)
 980 {
 981         struct urb *urb = as->urb;
 982         unsigned int i;
 983
 984         if (as->userbuffer)
 985                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
 986                         return -EFAULT;
 987         if (put_user(urb->status,
 988                      &((struct usbdevfs_urb *)as->userurb)->status))
 989                 return -EFAULT;
 990         if (put_user(urb->actual_length,
 991                      &((struct usbdevfs_urb *)as->userurb)->actual_length))
 992                 return -EFAULT;
 993         if (put_user(urb->error_count,
 994                      &((struct usbdevfs_urb *)as->userurb)->error_count))
 995                 return -EFAULT;
 996
 997         if (!(usb_pipeisoc(urb->pipe)))
 998                 return 0;
 999         for (i = 0; i < urb->number_of_packets; i++) {
1000                 if (put_user(urb->iso_frame_desc[i].actual_length,
1001                              &((struct usbdevfs_urb *)as->userurb)->iso_frame_desc[i].actual_length))
1002                         return -EFAULT;
1003                 if (put_user(urb->iso_frame_desc[i].status,
1004                              &((struct usbdevfs_urb *)as->userurb)->iso_frame_desc[i].status))
1005                         return -EFAULT;
1006         }
1007         return 0;
1008 }
1009
1010 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1011 {
1012         DECLARE_WAITQUEUE(wait, current);
1013         struct async *as = NULL;
1014         void __user *addr;
1015         int ret;
1016
1017         add_wait_queue(&ps->wait, &wait);
1018         while (ps->dev) {
1019                 __set_current_state(TASK_INTERRUPTIBLE);
1020                 if ((as = async_getcompleted(ps)))
1021                         break;
1022                 if (signal_pending(current))
1023                         break;
1024                 up_read(&ps->devsem);
1025                 schedule();
1026                 down_read(&ps->devsem);
1027         }
1028         remove_wait_queue(&ps->wait, &wait);
1029         set_current_state(TASK_RUNNING);
1030         if (as) {
1031                 ret = processcompl(as);
1032                 addr = as->userurb;
1033                 free_async(as);
1034                 if (ret)
1035                         return ret;
1036                 if (put_user(addr, (void **)arg))
1037                         return -EFAULT;
1038                 return 0;
1039         }
1040         if (signal_pending(current))
1041                 return -EINTR;
1042         return -EIO;
1043 }
1044
1045 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1046 {
1047         struct async *as;
1048         void __user *addr;
1049         int ret;
1050
1051         if (!(as = async_getcompleted(ps)))
1052                 return -EAGAIN;
1053         ret = processcompl(as);
1054         addr = as->userurb;
1055         free_async(as);
1056         if (ret)
1057                 return ret;
1058         if (put_user(addr, (void **)arg))
1059                 return -EFAULT;
1060         return 0;
1061 }
1062
1063 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1064 {
1065         struct usbdevfs_disconnectsignal ds;
1066
1067         if (copy_from_user(&ds, arg, sizeof(ds)))
1068                 return -EFAULT;
1069         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1070                 return -EINVAL;
1071         ps->discsignr = ds.signr;
1072         ps->disccontext = ds.context;
1073         return 0;
1074 }
1075
1076 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1077 {
1078         unsigned int intf;
1079         int ret;
1080
1081         if (get_user(intf, (unsigned int __user *)arg))
1082                 return -EFAULT;
1083         if ((ret = findintfif(ps->dev, intf)) < 0)
1084                 return ret;
1085         return claimintf(ps, ret);
1086 }
1087
1088 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1089 {
1090         unsigned int intf;
1091         int ret;
1092
1093         if (get_user(intf, (unsigned int __user *)arg))
1094                 return -EFAULT;
1095         if ((ret = findintfif(ps->dev, intf)) < 0)
1096                 return ret;
1097         if ((ret = releaseintf(ps, intf)) < 0)
1098                 return ret;
1099         destroy_async_on_interface (ps, intf);
1100         return 0;
1101 }
1102
1103 static int proc_ioctl (struct dev_state *ps, void __user *arg)
1104 {
1105         struct usbdevfs_ioctl   ctrl;
1106         int                     size;
1107         void                    *buf = 0;
1108         int                     retval = 0;
1109         struct usb_interface    *ifp = 0;
1110         struct usb_driver       *driver = 0;
1111
1112         /* get input parameters and alloc buffer */
1113         if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
1114                 return -EFAULT;
1115         if ((size = _IOC_SIZE (ctrl.ioctl_code)) > 0) {
1116                 if ((buf = kmalloc (size, GFP_KERNEL)) == 0)
1117                         return -ENOMEM;
1118                 if ((_IOC_DIR(ctrl.ioctl_code) & _IOC_WRITE)) {
1119                         if (copy_from_user (buf, ctrl.data, size)) {
1120                                 kfree (buf);
1121                                 return -EFAULT;
1122                         }
1123                 } else {
1124                         memset (buf, 0, size);
1125                 }
1126         }
1127
1128         if (!ps->dev) {
1129                 if (buf)
1130                         kfree(buf);
1131                 return -ENODEV;
1132         }
1133
1134         down(&ps->dev->serialize);
1135         if (ps->dev->state != USB_STATE_CONFIGURED)
1136                 retval = -ENODEV;
1137         else if (!(ifp = usb_ifnum_to_if (ps->dev, ctrl.ifno)))
1138                retval = -EINVAL;
1139         else switch (ctrl.ioctl_code) {
1140
1141         /* disconnect kernel driver from interface */
1142         case USBDEVFS_DISCONNECT:
1143                 down_write(&usb_bus_type.subsys.rwsem);
1144                 if (ifp->dev.driver) {
1145                         driver = to_usb_driver(ifp->dev.driver);
1146                         dev_dbg (&ifp->dev, "disconnect by usbfs\n");
1147                         usb_driver_release_interface(driver, ifp);
1148                 } else
1149                         retval = -ENODATA;
1150                 up_write(&usb_bus_type.subsys.rwsem);
1151                 break;
1152
1153         /* let kernel drivers try to (re)bind to the interface */
1154         case USBDEVFS_CONNECT:
1155                 bus_rescan_devices(ifp->dev.bus);
1156                 break;
1157
1158         /* talk directly to the interface's driver */
1159         default:
1160                 down_read(&usb_bus_type.subsys.rwsem);
1161                 if (ifp->dev.driver)
1162                         driver = to_usb_driver(ifp->dev.driver);
1163                 if (driver == 0 || driver->ioctl == 0) {
1164                         retval = -ENOTTY;
1165                 } else {
1166                         retval = driver->ioctl (ifp, ctrl.ioctl_code, buf);
1167                         if (retval == -ENOIOCTLCMD)
1168                                 retval = -ENOTTY;
1169                 }
1170                 up_read(&usb_bus_type.subsys.rwsem);
1171         }
1172         up(&ps->dev->serialize);
1173
1174         /* cleanup and return */
1175         if (retval >= 0
1176                         && (_IOC_DIR (ctrl.ioctl_code) & _IOC_READ) != 0
1177                         && size > 0
1178                         && copy_to_user (ctrl.data, buf, size) != 0)
1179                 retval = -EFAULT;
1180         if (buf != 0)
1181                 kfree (buf);
1182         return retval;
1183 }
1184
1185 /*
1186  * NOTE:  All requests here that have interface numbers as parameters
1187  * are assuming that somehow the configuration has been prevented from
1188  * changing.  But there's no mechanism to ensure that...
1189  */
1190 static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1191 {
1192         struct dev_state *ps = (struct dev_state *)file->private_data;
1193         int ret = -ENOTTY;
1194
1195         if (!(file->f_mode & FMODE_WRITE))
1196                 return -EPERM;
1197         down_read(&ps->devsem);
1198         if (!ps->dev) {
1199                 up_read(&ps->devsem);
1200                 return -ENODEV;
1201         }
1202         switch (cmd) {
1203         case USBDEVFS_CONTROL:
1204                 ret = proc_control(ps, (void __user *)arg);
1205                 if (ret >= 0)
1206                         inode->i_mtime = CURRENT_TIME;
1207                 break;
1208
1209         case USBDEVFS_BULK:
1210                 ret = proc_bulk(ps, (void __user *)arg);
1211                 if (ret >= 0)
1212                         inode->i_mtime = CURRENT_TIME;
1213                 break;
1214
1215         case USBDEVFS_RESETEP:
1216                 ret = proc_resetep(ps, (void __user *)arg);
1217                 if (ret >= 0)
1218                         inode->i_mtime = CURRENT_TIME;
1219                 break;
1220
1221         case USBDEVFS_RESET:
1222                 ret = proc_resetdevice(ps);
1223                 break;
1224
1225         case USBDEVFS_CLEAR_HALT:
1226                 ret = proc_clearhalt(ps, (void __user *)arg);
1227                 if (ret >= 0)
1228                         inode->i_mtime = CURRENT_TIME;
1229                 break;
1230
1231         case USBDEVFS_GETDRIVER:
1232                 ret = proc_getdriver(ps, (void __user *)arg);
1233                 break;
1234
1235         case USBDEVFS_CONNECTINFO:
1236                 ret = proc_connectinfo(ps, (void __user *)arg);
1237                 break;
1238
1239         case USBDEVFS_SETINTERFACE:
1240                 ret = proc_setintf(ps, (void __user *)arg);
1241                 break;
1242
1243         case USBDEVFS_SETCONFIGURATION:
1244                 ret = proc_setconfig(ps, (void __user *)arg);
1245                 break;
1246
1247         case USBDEVFS_SUBMITURB:
1248                 ret = proc_submiturb(ps, (void __user *)arg);
1249                 if (ret >= 0)
1250                         inode->i_mtime = CURRENT_TIME;
1251                 break;
1252
1253         case USBDEVFS_DISCARDURB:
1254                 ret = proc_unlinkurb(ps, (void __user *)arg);
1255                 break;
1256
1257         case USBDEVFS_REAPURB:
1258                 ret = proc_reapurb(ps, (void __user *)arg);
1259                 break;
1260
1261         case USBDEVFS_REAPURBNDELAY:
1262                 ret = proc_reapurbnonblock(ps, (void __user *)arg);
1263                 break;
1264
1265         case USBDEVFS_DISCSIGNAL:
1266                 ret = proc_disconnectsignal(ps, (void __user *)arg);
1267                 break;
1268
1269         case USBDEVFS_CLAIMINTERFACE:
1270                 ret = proc_claiminterface(ps, (void __user *)arg);
1271                 break;
1272
1273         case USBDEVFS_RELEASEINTERFACE:
1274                 ret = proc_releaseinterface(ps, (void __user *)arg);
1275                 break;
1276
1277         case USBDEVFS_IOCTL:
1278                 ret = proc_ioctl(ps, (void __user *) arg);
1279                 break;
1280         }
1281         up_read(&ps->devsem);
1282         if (ret >= 0)
1283                 inode->i_atime = CURRENT_TIME;
1284         return ret;
1285 }
1286
1287 /* No kernel lock - fine */
1288 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
1289 {
1290         struct dev_state *ps = (struct dev_state *)file->private_data;
1291         unsigned int mask = 0;
1292
1293         poll_wait(file, &ps->wait, wait);
1294         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1295                 mask |= POLLOUT | POLLWRNORM;
1296         if (!ps->dev)
1297                 mask |= POLLERR | POLLHUP;
1298         return mask;
1299 }
1300
1301 struct file_operations usbdevfs_device_file_operations = {
1302         .llseek =       usbdev_lseek,
1303         .read =         usbdev_read,
1304         .poll =         usbdev_poll,
1305         .ioctl =        usbdev_ioctl,
1306         .open =         usbdev_open,
1307         .release =      usbdev_release,
1308 };