drivers/usb/core/devio.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *      devio.c  --  User space communication with USB devices.
   5  *
   6  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   7  *
   8  *      This program is free software; you can redistribute it and/or modify
   9  *      it under the terms of the GNU General Public License as published by
  10  *      the Free Software Foundation; either version 2 of the License, or
  11  *      (at your option) any later version.
  12  *
  13  *      This program is distributed in the hope that it will be useful,
  14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *      GNU General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License
  19  *      along with this program; if not, write to the Free Software
  20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  *  This file implements the usbfs/x/y files, where
  23  *  x is the bus number and y the device number.
  24  *
  25  *  It allows user space programs/"drivers" to communicate directly
  26  *  with USB devices without intervening kernel driver.
  27  *
  28  *  Revision history
  29  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  30  *    04.01.2000   0.2   Turned into its own filesystem
  31  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  32  *                       (CAN-2005-3055)
  33  */
  34
  35 /*****************************************************************************/
  36
  37 #include <linux/fs.h>
  38 #include <linux/mm.h>
  39 #include <linux/slab.h>
  40 #include <linux/signal.h>
  41 #include <linux/poll.h>
  42 #include <linux/module.h>
  43 #include <linux/usb.h>
  44 #include <linux/usbdevice_fs.h>
  45 #include <linux/usb/hcd.h>      /* for usbcore internals */
  46 #include <linux/cdev.h>
  47 #include <linux/notifier.h>
  48 #include <linux/security.h>
  49 #include <linux/user_namespace.h>
  50 #include <asm/uaccess.h>
  51 #include <asm/byteorder.h>
  52 #include <linux/moduleparam.h>
  53
  54 #include "usb.h"
  55
  56 #define USB_MAXBUS                      64
  57 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
  58
  59 /* Mutual exclusion for removal, open, and release */
  60 DEFINE_MUTEX(usbfs_mutex);
  61
  62 struct dev_state {
  63         struct list_head list;      /* state list */
  64         struct usb_device *dev;
  65         struct file *file;
  66         spinlock_t lock;            /* protects the async urb lists */
  67         struct list_head async_pending;
  68         struct list_head async_completed;
  69         wait_queue_head_t wait;     /* wake up if a request completed */
  70         unsigned int discsignr;
  71         struct pid *disc_pid;
  72         const struct cred *cred;
  73         void __user *disccontext;
  74         unsigned long ifclaimed;
  75         u32 secid;
  76         u32 disabled_bulk_eps;
  77 };
  78
  79 struct async {
  80         struct list_head asynclist;
  81         struct dev_state *ps;
  82         struct pid *pid;
  83         const struct cred *cred;
  84         unsigned int signr;
  85         unsigned int ifnum;
  86         void __user *userbuffer;
  87         void __user *userurb;
  88         struct urb *urb;
  89         int status;
  90         u32 secid;
  91         u8 bulk_addr;
  92         u8 bulk_status;
  93 };
  94
  95 static int usbfs_snoop;
  96 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  97 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
  98
  99 #define snoop(dev, format, arg...)                              \
 100         do {                                                    \
 101                 if (usbfs_snoop)                                \
 102                         dev_info(dev , format , ## arg);        \
 103         } while (0)
 104
 105 enum snoop_when {
 106         SUBMIT, COMPLETE
 107 };
 108
 109 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 110
 111 #define MAX_USBFS_BUFFER_SIZE   16384
 112
 113
 114 static int connected(struct dev_state *ps)
 115 {
 116         return (!list_empty(&ps->list) &&
 117                         ps->dev->state != USB_STATE_NOTATTACHED);
 118 }
 119
 120 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
 121 {
 122         loff_t ret;
 123
 124         mutex_lock(&file->f_dentry->d_inode->i_mutex);
 125
 126         switch (orig) {
 127         case 0:
 128                 file->f_pos = offset;
 129                 ret = file->f_pos;
 130                 break;
 131         case 1:
 132                 file->f_pos += offset;
 133                 ret = file->f_pos;
 134                 break;
 135         case 2:
 136         default:
 137                 ret = -EINVAL;
 138         }
 139
 140         mutex_unlock(&file->f_dentry->d_inode->i_mutex);
 141         return ret;
 142 }
 143
 144 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 145                            loff_t *ppos)
 146 {
 147         struct dev_state *ps = file->private_data;
 148         struct usb_device *dev = ps->dev;
 149         ssize_t ret = 0;
 150         unsigned len;
 151         loff_t pos;
 152         int i;
 153
 154         pos = *ppos;
 155         usb_lock_device(dev);
 156         if (!connected(ps)) {
 157                 ret = -ENODEV;
 158                 goto err;
 159         } else if (pos < 0) {
 160                 ret = -EINVAL;
 161                 goto err;
 162         }
 163
 164         if (pos < sizeof(struct usb_device_descriptor)) {
 165                 /* 18 bytes - fits on the stack */
 166                 struct usb_device_descriptor temp_desc;
 167
 168                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 169                 le16_to_cpus(&temp_desc.bcdUSB);
 170                 le16_to_cpus(&temp_desc.idVendor);
 171                 le16_to_cpus(&temp_desc.idProduct);
 172                 le16_to_cpus(&temp_desc.bcdDevice);
 173
 174                 len = sizeof(struct usb_device_descriptor) - pos;
 175                 if (len > nbytes)
 176                         len = nbytes;
 177                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 178                         ret = -EFAULT;
 179                         goto err;
 180                 }
 181
 182                 *ppos += len;
 183                 buf += len;
 184                 nbytes -= len;
 185                 ret += len;
 186         }
 187
 188         pos = sizeof(struct usb_device_descriptor);
 189         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 190                 struct usb_config_descriptor *config =
 191                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 192                 unsigned int length = le16_to_cpu(config->wTotalLength);
 193
 194                 if (*ppos < pos + length) {
 195
 196                         /* The descriptor may claim to be longer than it
 197                          * really is.  Here is the actual allocated length. */
 198                         unsigned alloclen =
 199                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 200
 201                         len = length - (*ppos - pos);
 202                         if (len > nbytes)
 203                                 len = nbytes;
 204
 205                         /* Simply don't write (skip over) unallocated parts */
 206                         if (alloclen > (*ppos - pos)) {
 207                                 alloclen -= (*ppos - pos);
 208                                 if (copy_to_user(buf,
 209                                     dev->rawdescriptors[i] + (*ppos - pos),
 210                                     min(len, alloclen))) {
 211                                         ret = -EFAULT;
 212                                         goto err;
 213                                 }
 214                         }
 215
 216                         *ppos += len;
 217                         buf += len;
 218                         nbytes -= len;
 219                         ret += len;
 220                 }
 221
 222                 pos += length;
 223         }
 224
 225 err:
 226         usb_unlock_device(dev);
 227         return ret;
 228 }
 229
 230 /*
 231  * async list handling
 232  */
 233
 234 static struct async *alloc_async(unsigned int numisoframes)
 235 {
 236         struct async *as;
 237
 238         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 239         if (!as)
 240                 return NULL;
 241         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 242         if (!as->urb) {
 243                 kfree(as);
 244                 return NULL;
 245         }
 246         return as;
 247 }
 248
 249 static void free_async(struct async *as)
 250 {
 251         put_pid(as->pid);
 252         if (as->cred)
 253                 put_cred(as->cred);
 254         kfree(as->urb->transfer_buffer);
 255         kfree(as->urb->setup_packet);
 256         usb_free_urb(as->urb);
 257         kfree(as);
 258 }
 259
 260 static void async_newpending(struct async *as)
 261 {
 262         struct dev_state *ps = as->ps;
 263         unsigned long flags;
 264
 265         spin_lock_irqsave(&ps->lock, flags);
 266         list_add_tail(&as->asynclist, &ps->async_pending);
 267         spin_unlock_irqrestore(&ps->lock, flags);
 268 }
 269
 270 static void async_removepending(struct async *as)
 271 {
 272         struct dev_state *ps = as->ps;
 273         unsigned long flags;
 274
 275         spin_lock_irqsave(&ps->lock, flags);
 276         list_del_init(&as->asynclist);
 277         spin_unlock_irqrestore(&ps->lock, flags);
 278 }
 279
 280 static struct async *async_getcompleted(struct dev_state *ps)
 281 {
 282         unsigned long flags;
 283         struct async *as = NULL;
 284
 285         spin_lock_irqsave(&ps->lock, flags);
 286         if (!list_empty(&ps->async_completed)) {
 287                 as = list_entry(ps->async_completed.next, struct async,
 288                                 asynclist);
 289                 list_del_init(&as->asynclist);
 290         }
 291         spin_unlock_irqrestore(&ps->lock, flags);
 292         return as;
 293 }
 294
 295 static struct async *async_getpending(struct dev_state *ps,
 296                                              void __user *userurb)
 297 {
 298         struct async *as;
 299
 300         list_for_each_entry(as, &ps->async_pending, asynclist)
 301                 if (as->userurb == userurb) {
 302                         list_del_init(&as->asynclist);
 303                         return as;
 304                 }
 305
 306         return NULL;
 307 }
 308
 309 static void snoop_urb(struct usb_device *udev,
 310                 void __user *userurb, int pipe, unsigned length,
 311                 int timeout_or_status, enum snoop_when when,
 312                 unsigned char *data, unsigned data_len)
 313 {
 314         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 315         static const char *dirs[] = {"out", "in"};
 316         int ep;
 317         const char *t, *d;
 318
 319         if (!usbfs_snoop)
 320                 return;
 321
 322         ep = usb_pipeendpoint(pipe);
 323         t = types[usb_pipetype(pipe)];
 324         d = dirs[!!usb_pipein(pipe)];
 325
 326         if (userurb) {          /* Async */
 327                 if (when == SUBMIT)
 328                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 329                                         "length %u\n",
 330                                         userurb, ep, t, d, length);
 331                 else
 332                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 333                                         "actual_length %u status %d\n",
 334                                         userurb, ep, t, d, length,
 335                                         timeout_or_status);
 336         } else {
 337                 if (when == SUBMIT)
 338                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 339                                         "timeout %d\n",
 340                                         ep, t, d, length, timeout_or_status);
 341                 else
 342                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 343                                         "status %d\n",
 344                                         ep, t, d, length, timeout_or_status);
 345         }
 346
 347         if (data && data_len > 0) {
 348                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 349                         data, data_len, 1);
 350         }
 351 }
 352
 353 #define AS_CONTINUATION 1
 354 #define AS_UNLINK       2
 355
 356 static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr)
 357 __releases(ps->lock)
 358 __acquires(ps->lock)
 359 {
 360         struct urb *urb;
 361         struct async *as;
 362
 363         /* Mark all the pending URBs that match bulk_addr, up to but not
 364          * including the first one without AS_CONTINUATION.  If such an
 365          * URB is encountered then a new transfer has already started so
 366          * the endpoint doesn't need to be disabled; otherwise it does.
 367          */
 368         list_for_each_entry(as, &ps->async_pending, asynclist) {
 369                 if (as->bulk_addr == bulk_addr) {
 370                         if (as->bulk_status != AS_CONTINUATION)
 371                                 goto rescan;
 372                         as->bulk_status = AS_UNLINK;
 373                         as->bulk_addr = 0;
 374                 }
 375         }
 376         ps->disabled_bulk_eps |= (1 << bulk_addr);
 377
 378         /* Now carefully unlink all the marked pending URBs */
 379  rescan:
 380         list_for_each_entry(as, &ps->async_pending, asynclist) {
 381                 if (as->bulk_status == AS_UNLINK) {
 382                         as->bulk_status = 0;            /* Only once */
 383                         urb = as->urb;
 384                         usb_get_urb(urb);
 385                         spin_unlock(&ps->lock);         /* Allow completions */
 386                         usb_unlink_urb(urb);
 387                         usb_put_urb(urb);
 388                         spin_lock(&ps->lock);
 389                         goto rescan;
 390                 }
 391         }
 392 }
 393
 394 static void async_completed(struct urb *urb)
 395 {
 396         struct async *as = urb->context;
 397         struct dev_state *ps = as->ps;
 398         struct siginfo sinfo;
 399         struct pid *pid = NULL;
 400         u32 secid = 0;
 401         const struct cred *cred = NULL;
 402         int signr;
 403
 404         spin_lock(&ps->lock);
 405         list_move_tail(&as->asynclist, &ps->async_completed);
 406         as->status = urb->status;
 407         signr = as->signr;
 408         if (signr) {
 409                 sinfo.si_signo = as->signr;
 410                 sinfo.si_errno = as->status;
 411                 sinfo.si_code = SI_ASYNCIO;
 412                 sinfo.si_addr = as->userurb;
 413                 pid = get_pid(as->pid);
 414                 cred = get_cred(as->cred);
 415                 secid = as->secid;
 416         }
 417         snoop(&urb->dev->dev, "urb complete\n");
 418         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 419                         as->status, COMPLETE,
 420                         ((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_OUT) ?
 421                                 NULL : urb->transfer_buffer, urb->actual_length);
 422         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 423                         as->status != -ENOENT)
 424                 cancel_bulk_urbs(ps, as->bulk_addr);
 425         spin_unlock(&ps->lock);
 426
 427         if (signr) {
 428                 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
 429                 put_pid(pid);
 430                 put_cred(cred);
 431         }
 432
 433         wake_up(&ps->wait);
 434 }
 435
 436 static void destroy_async(struct dev_state *ps, struct list_head *list)
 437 {
 438         struct urb *urb;
 439         struct async *as;
 440         unsigned long flags;
 441
 442         spin_lock_irqsave(&ps->lock, flags);
 443         while (!list_empty(list)) {
 444                 as = list_entry(list->next, struct async, asynclist);
 445                 list_del_init(&as->asynclist);
 446                 urb = as->urb;
 447                 usb_get_urb(urb);
 448
 449                 /* drop the spinlock so the completion handler can run */
 450                 spin_unlock_irqrestore(&ps->lock, flags);
 451                 usb_kill_urb(urb);
 452                 usb_put_urb(urb);
 453                 spin_lock_irqsave(&ps->lock, flags);
 454         }
 455         spin_unlock_irqrestore(&ps->lock, flags);
 456 }
 457
 458 static void destroy_async_on_interface(struct dev_state *ps,
 459                                        unsigned int ifnum)
 460 {
 461         struct list_head *p, *q, hitlist;
 462         unsigned long flags;
 463
 464         INIT_LIST_HEAD(&hitlist);
 465         spin_lock_irqsave(&ps->lock, flags);
 466         list_for_each_safe(p, q, &ps->async_pending)
 467                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 468                         list_move_tail(p, &hitlist);
 469         spin_unlock_irqrestore(&ps->lock, flags);
 470         destroy_async(ps, &hitlist);
 471 }
 472
 473 static void destroy_all_async(struct dev_state *ps)
 474 {
 475         destroy_async(ps, &ps->async_pending);
 476 }
 477
 478 /*
 479  * interface claims are made only at the request of user level code,
 480  * which can also release them (explicitly or by closing files).
 481  * they're also undone when devices disconnect.
 482  */
 483
 484 static int driver_probe(struct usb_interface *intf,
 485                         const struct usb_device_id *id)
 486 {
 487         return -ENODEV;
 488 }
 489
 490 static void driver_disconnect(struct usb_interface *intf)
 491 {
 492         struct dev_state *ps = usb_get_intfdata(intf);
 493         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 494
 495         if (!ps)
 496                 return;
 497
 498         /* NOTE:  this relies on usbcore having canceled and completed
 499          * all pending I/O requests; 2.6 does that.
 500          */
 501
 502         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 503                 clear_bit(ifnum, &ps->ifclaimed);
 504         else
 505                 dev_warn(&intf->dev, "interface number %u out of range\n",
 506                          ifnum);
 507
 508         usb_set_intfdata(intf, NULL);
 509
 510         /* force async requests to complete */
 511         destroy_async_on_interface(ps, ifnum);
 512 }
 513
 514 /* The following routines are merely placeholders.  There is no way
 515  * to inform a user task about suspend or resumes.
 516  */
 517 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 518 {
 519         return 0;
 520 }
 521
 522 static int driver_resume(struct usb_interface *intf)
 523 {
 524         return 0;
 525 }
 526
 527 struct usb_driver usbfs_driver = {
 528         .name =         "usbfs",
 529         .probe =        driver_probe,
 530         .disconnect =   driver_disconnect,
 531         .suspend =      driver_suspend,
 532         .resume =       driver_resume,
 533 };
 534
 535 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 536 {
 537         struct usb_device *dev = ps->dev;
 538         struct usb_interface *intf;
 539         int err;
 540
 541         if (ifnum >= 8*sizeof(ps->ifclaimed))
 542                 return -EINVAL;
 543         /* already claimed */
 544         if (test_bit(ifnum, &ps->ifclaimed))
 545                 return 0;
 546
 547         intf = usb_ifnum_to_if(dev, ifnum);
 548         if (!intf)
 549                 err = -ENOENT;
 550         else
 551                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 552         if (err == 0)
 553                 set_bit(ifnum, &ps->ifclaimed);
 554         return err;
 555 }
 556
 557 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 558 {
 559         struct usb_device *dev;
 560         struct usb_interface *intf;
 561         int err;
 562
 563         err = -EINVAL;
 564         if (ifnum >= 8*sizeof(ps->ifclaimed))
 565                 return err;
 566         dev = ps->dev;
 567         intf = usb_ifnum_to_if(dev, ifnum);
 568         if (!intf)
 569                 err = -ENOENT;
 570         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 571                 usb_driver_release_interface(&usbfs_driver, intf);
 572                 err = 0;
 573         }
 574         return err;
 575 }
 576
 577 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 578 {
 579         if (ps->dev->state != USB_STATE_CONFIGURED)
 580                 return -EHOSTUNREACH;
 581         if (ifnum >= 8*sizeof(ps->ifclaimed))
 582                 return -EINVAL;
 583         if (test_bit(ifnum, &ps->ifclaimed))
 584                 return 0;
 585         /* if not yet claimed, claim it for the driver */
 586         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 587                  "interface %u before use\n", task_pid_nr(current),
 588                  current->comm, ifnum);
 589         return claimintf(ps, ifnum);
 590 }
 591
 592 static int findintfep(struct usb_device *dev, unsigned int ep)
 593 {
 594         unsigned int i, j, e;
 595         struct usb_interface *intf;
 596         struct usb_host_interface *alts;
 597         struct usb_endpoint_descriptor *endpt;
 598
 599         if (ep & ~(USB_DIR_IN|0xf))
 600                 return -EINVAL;
 601         if (!dev->actconfig)
 602                 return -ESRCH;
 603         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 604                 intf = dev->actconfig->interface[i];
 605                 for (j = 0; j < intf->num_altsetting; j++) {
 606                         alts = &intf->altsetting[j];
 607                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 608                                 endpt = &alts->endpoint[e].desc;
 609                                 if (endpt->bEndpointAddress == ep)
 610                                         return alts->desc.bInterfaceNumber;
 611                         }
 612                 }
 613         }
 614         return -ENOENT;
 615 }
 616
 617 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
 618                            unsigned int request, unsigned int index)
 619 {
 620         int ret = 0;
 621         struct usb_host_interface *alt_setting;
 622
 623         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 624          && ps->dev->state != USB_STATE_ADDRESS
 625          && ps->dev->state != USB_STATE_CONFIGURED)
 626                 return -EHOSTUNREACH;
 627         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 628                 return 0;
 629
 630         /*
 631          * check for the special corner case 'get_device_id' in the printer
 632          * class specification, where wIndex is (interface << 8 | altsetting)
 633          * instead of just interface
 634          */
 635         if (requesttype == 0xa1 && request == 0) {
 636                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
 637                                                    index >> 8, index & 0xff);
 638                 if (alt_setting
 639                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
 640                         index >>= 8;
 641         }
 642
 643         index &= 0xff;
 644         switch (requesttype & USB_RECIP_MASK) {
 645         case USB_RECIP_ENDPOINT:
 646                 ret = findintfep(ps->dev, index);
 647                 if (ret >= 0)
 648                         ret = checkintf(ps, ret);
 649                 break;
 650
 651         case USB_RECIP_INTERFACE:
 652                 ret = checkintf(ps, index);
 653                 break;
 654         }
 655         return ret;
 656 }
 657
 658 static int match_devt(struct device *dev, void *data)
 659 {
 660         return dev->devt == (dev_t) (unsigned long) data;
 661 }
 662
 663 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 664 {
 665         struct device *dev;
 666
 667         dev = bus_find_device(&usb_bus_type, NULL,
 668                               (void *) (unsigned long) devt, match_devt);
 669         if (!dev)
 670                 return NULL;
 671         return container_of(dev, struct usb_device, dev);
 672 }
 673
 674 /*
 675  * file operations
 676  */
 677 static int usbdev_open(struct inode *inode, struct file *file)
 678 {
 679         struct usb_device *dev = NULL;
 680         struct dev_state *ps;
 681         int ret;
 682
 683         ret = -ENOMEM;
 684         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
 685         if (!ps)
 686                 goto out_free_ps;
 687
 688         ret = -ENODEV;
 689
 690         /* Protect against simultaneous removal or release */
 691         mutex_lock(&usbfs_mutex);
 692
 693         /* usbdev device-node */
 694         if (imajor(inode) == USB_DEVICE_MAJOR)
 695                 dev = usbdev_lookup_by_devt(inode->i_rdev);
 696
 697 #ifdef CONFIG_USB_DEVICEFS
 698         /* procfs file */
 699         if (!dev) {
 700                 dev = inode->i_private;
 701                 if (dev && dev->usbfs_dentry &&
 702                                         dev->usbfs_dentry->d_inode == inode)
 703                         usb_get_dev(dev);
 704                 else
 705                         dev = NULL;
 706         }
 707 #endif
 708         mutex_unlock(&usbfs_mutex);
 709
 710         if (!dev)
 711                 goto out_free_ps;
 712
 713         usb_lock_device(dev);
 714         if (dev->state == USB_STATE_NOTATTACHED)
 715                 goto out_unlock_device;
 716
 717         ret = usb_autoresume_device(dev);
 718         if (ret)
 719                 goto out_unlock_device;
 720
 721         ps->dev = dev;
 722         ps->file = file;
 723         spin_lock_init(&ps->lock);
 724         INIT_LIST_HEAD(&ps->list);
 725         INIT_LIST_HEAD(&ps->async_pending);
 726         INIT_LIST_HEAD(&ps->async_completed);
 727         init_waitqueue_head(&ps->wait);
 728         ps->discsignr = 0;
 729         ps->disc_pid = get_pid(task_pid(current));
 730         ps->cred = get_current_cred();
 731         ps->disccontext = NULL;
 732         ps->ifclaimed = 0;
 733         security_task_getsecid(current, &ps->secid);
 734         smp_wmb();
 735         list_add_tail(&ps->list, &dev->filelist);
 736         file->private_data = ps;
 737         usb_unlock_device(dev);
 738         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
 739                         current->comm);
 740         return ret;
 741
 742  out_unlock_device:
 743         usb_unlock_device(dev);
 744         usb_put_dev(dev);
 745  out_free_ps:
 746         kfree(ps);
 747         return ret;
 748 }
 749
 750 static int usbdev_release(struct inode *inode, struct file *file)
 751 {
 752         struct dev_state *ps = file->private_data;
 753         struct usb_device *dev = ps->dev;
 754         unsigned int ifnum;
 755         struct async *as;
 756
 757         usb_lock_device(dev);
 758         usb_hub_release_all_ports(dev, ps);
 759
 760         list_del_init(&ps->list);
 761
 762         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 763                         ifnum++) {
 764                 if (test_bit(ifnum, &ps->ifclaimed))
 765                         releaseintf(ps, ifnum);
 766         }
 767         destroy_all_async(ps);
 768         usb_autosuspend_device(dev);
 769         usb_unlock_device(dev);
 770         usb_put_dev(dev);
 771         put_pid(ps->disc_pid);
 772         put_cred(ps->cred);
 773
 774         as = async_getcompleted(ps);
 775         while (as) {
 776                 free_async(as);
 777                 as = async_getcompleted(ps);
 778         }
 779         kfree(ps);
 780         return 0;
 781 }
 782
 783 static int proc_control(struct dev_state *ps, void __user *arg)
 784 {
 785         struct usb_device *dev = ps->dev;
 786         struct usbdevfs_ctrltransfer ctrl;
 787         unsigned int tmo;
 788         unsigned char *tbuf;
 789         unsigned wLength;
 790         int i, pipe, ret;
 791
 792         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 793                 return -EFAULT;
 794         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
 795                               ctrl.wIndex);
 796         if (ret)
 797                 return ret;
 798         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
 799         if (wLength > PAGE_SIZE)
 800                 return -EINVAL;
 801         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
 802         if (!tbuf)
 803                 return -ENOMEM;
 804         tmo = ctrl.timeout;
 805         snoop(&dev->dev, "control urb: bRequestType=%02x "
 806                 "bRequest=%02x wValue=%04x "
 807                 "wIndex=%04x wLength=%04x\n",
 808                 ctrl.bRequestType, ctrl.bRequest,
 809                 __le16_to_cpup(&ctrl.wValue),
 810                 __le16_to_cpup(&ctrl.wIndex),
 811                 __le16_to_cpup(&ctrl.wLength));
 812         if (ctrl.bRequestType & 0x80) {
 813                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
 814                                                ctrl.wLength)) {
 815                         free_page((unsigned long)tbuf);
 816                         return -EINVAL;
 817                 }
 818                 pipe = usb_rcvctrlpipe(dev, 0);
 819                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
 820
 821                 usb_unlock_device(dev);
 822                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
 823                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 824                                     tbuf, ctrl.wLength, tmo);
 825                 usb_lock_device(dev);
 826                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
 827                           tbuf, max(i, 0));
 828                 if ((i > 0) && ctrl.wLength) {
 829                         if (copy_to_user(ctrl.data, tbuf, i)) {
 830                                 free_page((unsigned long)tbuf);
 831                                 return -EFAULT;
 832                         }
 833                 }
 834         } else {
 835                 if (ctrl.wLength) {
 836                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 837                                 free_page((unsigned long)tbuf);
 838                                 return -EFAULT;
 839                         }
 840                 }
 841                 pipe = usb_sndctrlpipe(dev, 0);
 842                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
 843                         tbuf, ctrl.wLength);
 844
 845                 usb_unlock_device(dev);
 846                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
 847                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 848                                     tbuf, ctrl.wLength, tmo);
 849                 usb_lock_device(dev);
 850                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
 851         }
 852         free_page((unsigned long)tbuf);
 853         if (i < 0 && i != -EPIPE) {
 854                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 855                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 856                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 857                            ctrl.wLength, i);
 858         }
 859         return i;
 860 }
 861
 862 static int proc_bulk(struct dev_state *ps, void __user *arg)
 863 {
 864         struct usb_device *dev = ps->dev;
 865         struct usbdevfs_bulktransfer bulk;
 866         unsigned int tmo, len1, pipe;
 867         int len2;
 868         unsigned char *tbuf;
 869         int i, ret;
 870
 871         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 872                 return -EFAULT;
 873         ret = findintfep(ps->dev, bulk.ep);
 874         if (ret < 0)
 875                 return ret;
 876         ret = checkintf(ps, ret);
 877         if (ret)
 878                 return ret;
 879         if (bulk.ep & USB_DIR_IN)
 880                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 881         else
 882                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 883         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 884                 return -EINVAL;
 885         len1 = bulk.len;
 886         if (len1 > MAX_USBFS_BUFFER_SIZE)
 887                 return -EINVAL;
 888         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 889                 return -ENOMEM;
 890         tmo = bulk.timeout;
 891         if (bulk.ep & 0x80) {
 892                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 893                         kfree(tbuf);
 894                         return -EINVAL;
 895                 }
 896                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
 897
 898                 usb_unlock_device(dev);
 899                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 900                 usb_lock_device(dev);
 901                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
 902
 903                 if (!i && len2) {
 904                         if (copy_to_user(bulk.data, tbuf, len2)) {
 905                                 kfree(tbuf);
 906                                 return -EFAULT;
 907                         }
 908                 }
 909         } else {
 910                 if (len1) {
 911                         if (copy_from_user(tbuf, bulk.data, len1)) {
 912                                 kfree(tbuf);
 913                                 return -EFAULT;
 914                         }
 915                 }
 916                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
 917
 918                 usb_unlock_device(dev);
 919                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 920                 usb_lock_device(dev);
 921                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
 922         }
 923         kfree(tbuf);
 924         if (i < 0)
 925                 return i;
 926         return len2;
 927 }
 928
 929 static int proc_resetep(struct dev_state *ps, void __user *arg)
 930 {
 931         unsigned int ep;
 932         int ret;
 933
 934         if (get_user(ep, (unsigned int __user *)arg))
 935                 return -EFAULT;
 936         ret = findintfep(ps->dev, ep);
 937         if (ret < 0)
 938                 return ret;
 939         ret = checkintf(ps, ret);
 940         if (ret)
 941                 return ret;
 942         usb_reset_endpoint(ps->dev, ep);
 943         return 0;
 944 }
 945
 946 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 947 {
 948         unsigned int ep;
 949         int pipe;
 950         int ret;
 951
 952         if (get_user(ep, (unsigned int __user *)arg))
 953                 return -EFAULT;
 954         ret = findintfep(ps->dev, ep);
 955         if (ret < 0)
 956                 return ret;
 957         ret = checkintf(ps, ret);
 958         if (ret)
 959                 return ret;
 960         if (ep & USB_DIR_IN)
 961                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 962         else
 963                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 964
 965         return usb_clear_halt(ps->dev, pipe);
 966 }
 967
 968 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 969 {
 970         struct usbdevfs_getdriver gd;
 971         struct usb_interface *intf;
 972         int ret;
 973
 974         if (copy_from_user(&gd, arg, sizeof(gd)))
 975                 return -EFAULT;
 976         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 977         if (!intf || !intf->dev.driver)
 978                 ret = -ENODATA;
 979         else {
 980                 strncpy(gd.driver, intf->dev.driver->name,
 981                                 sizeof(gd.driver));
 982                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 983         }
 984         return ret;
 985 }
 986
 987 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 988 {
 989         struct usbdevfs_connectinfo ci = {
 990                 .devnum = ps->dev->devnum,
 991                 .slow = ps->dev->speed == USB_SPEED_LOW
 992         };
 993
 994         if (copy_to_user(arg, &ci, sizeof(ci)))
 995                 return -EFAULT;
 996         return 0;
 997 }
 998
 999 static int proc_resetdevice(struct dev_state *ps)
1000 {
1001         return usb_reset_device(ps->dev);
1002 }
1003
1004 static int proc_setintf(struct dev_state *ps, void __user *arg)
1005 {
1006         struct usbdevfs_setinterface setintf;
1007         int ret;
1008
1009         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1010                 return -EFAULT;
1011         if ((ret = checkintf(ps, setintf.interface)))
1012                 return ret;
1013         return usb_set_interface(ps->dev, setintf.interface,
1014                         setintf.altsetting);
1015 }
1016
1017 static int proc_setconfig(struct dev_state *ps, void __user *arg)
1018 {
1019         int u;
1020         int status = 0;
1021         struct usb_host_config *actconfig;
1022
1023         if (get_user(u, (int __user *)arg))
1024                 return -EFAULT;
1025
1026         actconfig = ps->dev->actconfig;
1027
1028         /* Don't touch the device if any interfaces are claimed.
1029          * It could interfere with other drivers' operations, and if
1030          * an interface is claimed by usbfs it could easily deadlock.
1031          */
1032         if (actconfig) {
1033                 int i;
1034
1035                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1036                         if (usb_interface_claimed(actconfig->interface[i])) {
1037                                 dev_warn(&ps->dev->dev,
1038                                         "usbfs: interface %d claimed by %s "
1039                                         "while '%s' sets config #%d\n",
1040                                         actconfig->interface[i]
1041                                                 ->cur_altsetting
1042                                                 ->desc.bInterfaceNumber,
1043                                         actconfig->interface[i]
1044                                                 ->dev.driver->name,
1045                                         current->comm, u);
1046                                 status = -EBUSY;
1047                                 break;
1048                         }
1049                 }
1050         }
1051
1052         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1053          * so avoid usb_set_configuration()'s kick to sysfs
1054          */
1055         if (status == 0) {
1056                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1057                         status = usb_reset_configuration(ps->dev);
1058                 else
1059                         status = usb_set_configuration(ps->dev, u);
1060         }
1061
1062         return status;
1063 }
1064
1065 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1066                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1067                         void __user *arg)
1068 {
1069         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1070         struct usb_host_endpoint *ep;
1071         struct async *as;
1072         struct usb_ctrlrequest *dr = NULL;
1073         unsigned int u, totlen, isofrmlen;
1074         int ret, ifnum = -1;
1075         int is_in;
1076
1077         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1078                                 USBDEVFS_URB_SHORT_NOT_OK |
1079                                 USBDEVFS_URB_BULK_CONTINUATION |
1080                                 USBDEVFS_URB_NO_FSBR |
1081                                 USBDEVFS_URB_ZERO_PACKET |
1082                                 USBDEVFS_URB_NO_INTERRUPT))
1083                 return -EINVAL;
1084         if (uurb->buffer_length > 0 && !uurb->buffer)
1085                 return -EINVAL;
1086         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1087             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1088                 ifnum = findintfep(ps->dev, uurb->endpoint);
1089                 if (ifnum < 0)
1090                         return ifnum;
1091                 ret = checkintf(ps, ifnum);
1092                 if (ret)
1093                         return ret;
1094         }
1095         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1096                 is_in = 1;
1097                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1098         } else {
1099                 is_in = 0;
1100                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1101         }
1102         if (!ep)
1103                 return -ENOENT;
1104         switch(uurb->type) {
1105         case USBDEVFS_URB_TYPE_CONTROL:
1106                 if (!usb_endpoint_xfer_control(&ep->desc))
1107                         return -EINVAL;
1108                 /* min 8 byte setup packet,
1109                  * max 8 byte setup plus an arbitrary data stage */
1110                 if (uurb->buffer_length < 8 ||
1111                     uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1112                         return -EINVAL;
1113                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1114                 if (!dr)
1115                         return -ENOMEM;
1116                 if (copy_from_user(dr, uurb->buffer, 8)) {
1117                         kfree(dr);
1118                         return -EFAULT;
1119                 }
1120                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1121                         kfree(dr);
1122                         return -EINVAL;
1123                 }
1124                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1125                                       le16_to_cpup(&dr->wIndex));
1126                 if (ret) {
1127                         kfree(dr);
1128                         return ret;
1129                 }
1130                 uurb->number_of_packets = 0;
1131                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1132                 uurb->buffer += 8;
1133                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1134                         is_in = 1;
1135                         uurb->endpoint |= USB_DIR_IN;
1136                 } else {
1137                         is_in = 0;
1138                         uurb->endpoint &= ~USB_DIR_IN;
1139                 }
1140                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1141                         "bRequest=%02x wValue=%04x "
1142                         "wIndex=%04x wLength=%04x\n",
1143                         dr->bRequestType, dr->bRequest,
1144                         __le16_to_cpup(&dr->wValue),
1145                         __le16_to_cpup(&dr->wIndex),
1146                         __le16_to_cpup(&dr->wLength));
1147                 break;
1148
1149         case USBDEVFS_URB_TYPE_BULK:
1150                 switch (usb_endpoint_type(&ep->desc)) {
1151                 case USB_ENDPOINT_XFER_CONTROL:
1152                 case USB_ENDPOINT_XFER_ISOC:
1153                         return -EINVAL;
1154                 case USB_ENDPOINT_XFER_INT:
1155                         /* allow single-shot interrupt transfers */
1156                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1157                         goto interrupt_urb;
1158                 }
1159                 uurb->number_of_packets = 0;
1160                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1161                         return -EINVAL;
1162                 break;
1163
1164         case USBDEVFS_URB_TYPE_INTERRUPT:
1165                 if (!usb_endpoint_xfer_int(&ep->desc))
1166                         return -EINVAL;
1167  interrupt_urb:
1168                 uurb->number_of_packets = 0;
1169                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1170                         return -EINVAL;
1171                 break;
1172
1173         case USBDEVFS_URB_TYPE_ISO:
1174                 /* arbitrary limit */
1175                 if (uurb->number_of_packets < 1 ||
1176                     uurb->number_of_packets > 128)
1177                         return -EINVAL;
1178                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1179                         return -EINVAL;
1180                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1181                                    uurb->number_of_packets;
1182                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1183                         return -ENOMEM;
1184                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1185                         kfree(isopkt);
1186                         return -EFAULT;
1187                 }
1188                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1189                         /* arbitrary limit,
1190                          * sufficient for USB 2.0 high-bandwidth iso */
1191                         if (isopkt[u].length > 8192) {
1192                                 kfree(isopkt);
1193                                 return -EINVAL;
1194                         }
1195                         totlen += isopkt[u].length;
1196                 }
1197                 /* 3072 * 64 microframes */
1198                 if (totlen > 196608) {
1199                         kfree(isopkt);
1200                         return -EINVAL;
1201                 }
1202                 uurb->buffer_length = totlen;
1203                 break;
1204
1205         default:
1206                 return -EINVAL;
1207         }
1208         if (uurb->buffer_length > 0 &&
1209                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1210                                 uurb->buffer, uurb->buffer_length)) {
1211                 kfree(isopkt);
1212                 kfree(dr);
1213                 return -EFAULT;
1214         }
1215         as = alloc_async(uurb->number_of_packets);
1216         if (!as) {
1217                 kfree(isopkt);
1218                 kfree(dr);
1219                 return -ENOMEM;
1220         }
1221         if (uurb->buffer_length > 0) {
1222                 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1223                                 GFP_KERNEL);
1224                 if (!as->urb->transfer_buffer) {
1225                         kfree(isopkt);
1226                         kfree(dr);
1227                         free_async(as);
1228                         return -ENOMEM;
1229                 }
1230                 /* Isochronous input data may end up being discontiguous
1231                  * if some of the packets are short.  Clear the buffer so
1232                  * that the gaps don't leak kernel data to userspace.
1233                  */
1234                 if (is_in && uurb->type == USBDEVFS_URB_TYPE_ISO)
1235                         memset(as->urb->transfer_buffer, 0,
1236                                         uurb->buffer_length);
1237         }
1238         as->urb->dev = ps->dev;
1239         as->urb->pipe = (uurb->type << 30) |
1240                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1241                         (uurb->endpoint & USB_DIR_IN);
1242
1243         /* This tedious sequence is necessary because the URB_* flags
1244          * are internal to the kernel and subject to change, whereas
1245          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1246          */
1247         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1248         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1249                 u |= URB_ISO_ASAP;
1250         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1251                 u |= URB_SHORT_NOT_OK;
1252         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1253                 u |= URB_NO_FSBR;
1254         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1255                 u |= URB_ZERO_PACKET;
1256         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1257                 u |= URB_NO_INTERRUPT;
1258         as->urb->transfer_flags = u;
1259
1260         as->urb->transfer_buffer_length = uurb->buffer_length;
1261         as->urb->setup_packet = (unsigned char *)dr;
1262         as->urb->start_frame = uurb->start_frame;
1263         as->urb->number_of_packets = uurb->number_of_packets;
1264         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1265                         ps->dev->speed == USB_SPEED_HIGH)
1266                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1267         else
1268                 as->urb->interval = ep->desc.bInterval;
1269         as->urb->context = as;
1270         as->urb->complete = async_completed;
1271         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1272                 as->urb->iso_frame_desc[u].offset = totlen;
1273                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1274                 totlen += isopkt[u].length;
1275         }
1276         kfree(isopkt);
1277         as->ps = ps;
1278         as->userurb = arg;
1279         if (is_in && uurb->buffer_length > 0)
1280                 as->userbuffer = uurb->buffer;
1281         else
1282                 as->userbuffer = NULL;
1283         as->signr = uurb->signr;
1284         as->ifnum = ifnum;
1285         as->pid = get_pid(task_pid(current));
1286         as->cred = get_current_cred();
1287         security_task_getsecid(current, &as->secid);
1288         if (!is_in && uurb->buffer_length > 0) {
1289                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1290                                 uurb->buffer_length)) {
1291                         free_async(as);
1292                         return -EFAULT;
1293                 }
1294         }
1295         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1296                         as->urb->transfer_buffer_length, 0, SUBMIT,
1297                         is_in ? NULL : as->urb->transfer_buffer,
1298                                 uurb->buffer_length);
1299         async_newpending(as);
1300
1301         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1302                 spin_lock_irq(&ps->lock);
1303
1304                 /* Not exactly the endpoint address; the direction bit is
1305                  * shifted to the 0x10 position so that the value will be
1306                  * between 0 and 31.
1307                  */
1308                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1309                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1310                                 >> 3);
1311
1312                 /* If this bulk URB is the start of a new transfer, re-enable
1313                  * the endpoint.  Otherwise mark it as a continuation URB.
1314                  */
1315                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1316                         as->bulk_status = AS_CONTINUATION;
1317                 else
1318                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1319
1320                 /* Don't accept continuation URBs if the endpoint is
1321                  * disabled because of an earlier error.
1322                  */
1323                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1324                         ret = -EREMOTEIO;
1325                 else
1326                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1327                 spin_unlock_irq(&ps->lock);
1328         } else {
1329                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1330         }
1331
1332         if (ret) {
1333                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1334                            "usbfs: usb_submit_urb returned %d\n", ret);
1335                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1336                                 0, ret, COMPLETE, NULL, 0);
1337                 async_removepending(as);
1338                 free_async(as);
1339                 return ret;
1340         }
1341         return 0;
1342 }
1343
1344 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1345 {
1346         struct usbdevfs_urb uurb;
1347
1348         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1349                 return -EFAULT;
1350
1351         return proc_do_submiturb(ps, &uurb,
1352                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1353                         arg);
1354 }
1355
1356 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1357 {
1358         struct urb *urb;
1359         struct async *as;
1360         unsigned long flags;
1361
1362         spin_lock_irqsave(&ps->lock, flags);
1363         as = async_getpending(ps, arg);
1364         if (!as) {
1365                 spin_unlock_irqrestore(&ps->lock, flags);
1366                 return -EINVAL;
1367         }
1368
1369         urb = as->urb;
1370         usb_get_urb(urb);
1371         spin_unlock_irqrestore(&ps->lock, flags);
1372
1373         usb_kill_urb(urb);
1374         usb_put_urb(urb);
1375
1376         return 0;
1377 }
1378
1379 static int processcompl(struct async *as, void __user * __user *arg)
1380 {
1381         struct urb *urb = as->urb;
1382         struct usbdevfs_urb __user *userurb = as->userurb;
1383         void __user *addr = as->userurb;
1384         unsigned int i;
1385
1386         if (as->userbuffer && urb->actual_length) {
1387                 if (urb->number_of_packets > 0)         /* Isochronous */
1388                         i = urb->transfer_buffer_length;
1389                 else                                    /* Non-Isoc */
1390                         i = urb->actual_length;
1391                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, i))
1392                         goto err_out;
1393         }
1394         if (put_user(as->status, &userurb->status))
1395                 goto err_out;
1396         if (put_user(urb->actual_length, &userurb->actual_length))
1397                 goto err_out;
1398         if (put_user(urb->error_count, &userurb->error_count))
1399                 goto err_out;
1400
1401         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1402                 for (i = 0; i < urb->number_of_packets; i++) {
1403                         if (put_user(urb->iso_frame_desc[i].actual_length,
1404                                      &userurb->iso_frame_desc[i].actual_length))
1405                                 goto err_out;
1406                         if (put_user(urb->iso_frame_desc[i].status,
1407                                      &userurb->iso_frame_desc[i].status))
1408                                 goto err_out;
1409                 }
1410         }
1411
1412         if (put_user(addr, (void __user * __user *)arg))
1413                 return -EFAULT;
1414         return 0;
1415
1416 err_out:
1417         return -EFAULT;
1418 }
1419
1420 static struct async *reap_as(struct dev_state *ps)
1421 {
1422         DECLARE_WAITQUEUE(wait, current);
1423         struct async *as = NULL;
1424         struct usb_device *dev = ps->dev;
1425
1426         add_wait_queue(&ps->wait, &wait);
1427         for (;;) {
1428                 __set_current_state(TASK_INTERRUPTIBLE);
1429                 as = async_getcompleted(ps);
1430                 if (as)
1431                         break;
1432                 if (signal_pending(current))
1433                         break;
1434                 usb_unlock_device(dev);
1435                 schedule();
1436                 usb_lock_device(dev);
1437         }
1438         remove_wait_queue(&ps->wait, &wait);
1439         set_current_state(TASK_RUNNING);
1440         return as;
1441 }
1442
1443 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1444 {
1445         struct async *as = reap_as(ps);
1446         if (as) {
1447                 int retval = processcompl(as, (void __user * __user *)arg);
1448                 free_async(as);
1449                 return retval;
1450         }
1451         if (signal_pending(current))
1452                 return -EINTR;
1453         return -EIO;
1454 }
1455
1456 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1457 {
1458         int retval;
1459         struct async *as;
1460
1461         as = async_getcompleted(ps);
1462         retval = -EAGAIN;
1463         if (as) {
1464                 retval = processcompl(as, (void __user * __user *)arg);
1465                 free_async(as);
1466         }
1467         return retval;
1468 }
1469
1470 #ifdef CONFIG_COMPAT
1471 static int proc_control_compat(struct dev_state *ps,
1472                                 struct usbdevfs_ctrltransfer32 __user *p32)
1473 {
1474         struct usbdevfs_ctrltransfer __user *p;
1475         __u32 udata;
1476         p = compat_alloc_user_space(sizeof(*p));
1477         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1478             get_user(udata, &p32->data) ||
1479             put_user(compat_ptr(udata), &p->data))
1480                 return -EFAULT;
1481         return proc_control(ps, p);
1482 }
1483
1484 static int proc_bulk_compat(struct dev_state *ps,
1485                         struct usbdevfs_bulktransfer32 __user *p32)
1486 {
1487         struct usbdevfs_bulktransfer __user *p;
1488         compat_uint_t n;
1489         compat_caddr_t addr;
1490
1491         p = compat_alloc_user_space(sizeof(*p));
1492
1493         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1494             get_user(n, &p32->len) || put_user(n, &p->len) ||
1495             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1496             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1497                 return -EFAULT;
1498
1499         return proc_bulk(ps, p);
1500 }
1501 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1502 {
1503         struct usbdevfs_disconnectsignal32 ds;
1504
1505         if (copy_from_user(&ds, arg, sizeof(ds)))
1506                 return -EFAULT;
1507         ps->discsignr = ds.signr;
1508         ps->disccontext = compat_ptr(ds.context);
1509         return 0;
1510 }
1511
1512 static int get_urb32(struct usbdevfs_urb *kurb,
1513                      struct usbdevfs_urb32 __user *uurb)
1514 {
1515         __u32  uptr;
1516         if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1517             __get_user(kurb->type, &uurb->type) ||
1518             __get_user(kurb->endpoint, &uurb->endpoint) ||
1519             __get_user(kurb->status, &uurb->status) ||
1520             __get_user(kurb->flags, &uurb->flags) ||
1521             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1522             __get_user(kurb->actual_length, &uurb->actual_length) ||
1523             __get_user(kurb->start_frame, &uurb->start_frame) ||
1524             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1525             __get_user(kurb->error_count, &uurb->error_count) ||
1526             __get_user(kurb->signr, &uurb->signr))
1527                 return -EFAULT;
1528
1529         if (__get_user(uptr, &uurb->buffer))
1530                 return -EFAULT;
1531         kurb->buffer = compat_ptr(uptr);
1532         if (__get_user(uptr, &uurb->usercontext))
1533                 return -EFAULT;
1534         kurb->usercontext = compat_ptr(uptr);
1535
1536         return 0;
1537 }
1538
1539 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1540 {
1541         struct usbdevfs_urb uurb;
1542
1543         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1544                 return -EFAULT;
1545
1546         return proc_do_submiturb(ps, &uurb,
1547                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1548                         arg);
1549 }
1550
1551 static int processcompl_compat(struct async *as, void __user * __user *arg)
1552 {
1553         struct urb *urb = as->urb;
1554         struct usbdevfs_urb32 __user *userurb = as->userurb;
1555         void __user *addr = as->userurb;
1556         unsigned int i;
1557
1558         if (as->userbuffer && urb->actual_length)
1559                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1560                                  urb->actual_length))
1561                         return -EFAULT;
1562         if (put_user(as->status, &userurb->status))
1563                 return -EFAULT;
1564         if (put_user(urb->actual_length, &userurb->actual_length))
1565                 return -EFAULT;
1566         if (put_user(urb->error_count, &userurb->error_count))
1567                 return -EFAULT;
1568
1569         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1570                 for (i = 0; i < urb->number_of_packets; i++) {
1571                         if (put_user(urb->iso_frame_desc[i].actual_length,
1572                                      &userurb->iso_frame_desc[i].actual_length))
1573                                 return -EFAULT;
1574                         if (put_user(urb->iso_frame_desc[i].status,
1575                                      &userurb->iso_frame_desc[i].status))
1576                                 return -EFAULT;
1577                 }
1578         }
1579
1580         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1581                 return -EFAULT;
1582         return 0;
1583 }
1584
1585 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1586 {
1587         struct async *as = reap_as(ps);
1588         if (as) {
1589                 int retval = processcompl_compat(as, (void __user * __user *)arg);
1590                 free_async(as);
1591                 return retval;
1592         }
1593         if (signal_pending(current))
1594                 return -EINTR;
1595         return -EIO;
1596 }
1597
1598 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1599 {
1600         int retval;
1601         struct async *as;
1602
1603         retval = -EAGAIN;
1604         as = async_getcompleted(ps);
1605         if (as) {
1606                 retval = processcompl_compat(as, (void __user * __user *)arg);
1607                 free_async(as);
1608         }
1609         return retval;
1610 }
1611
1612
1613 #endif
1614
1615 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1616 {
1617         struct usbdevfs_disconnectsignal ds;
1618
1619         if (copy_from_user(&ds, arg, sizeof(ds)))
1620                 return -EFAULT;
1621         ps->discsignr = ds.signr;
1622         ps->disccontext = ds.context;
1623         return 0;
1624 }
1625
1626 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1627 {
1628         unsigned int ifnum;
1629
1630         if (get_user(ifnum, (unsigned int __user *)arg))
1631                 return -EFAULT;
1632         return claimintf(ps, ifnum);
1633 }
1634
1635 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1636 {
1637         unsigned int ifnum;
1638         int ret;
1639
1640         if (get_user(ifnum, (unsigned int __user *)arg))
1641                 return -EFAULT;
1642         if ((ret = releaseintf(ps, ifnum)) < 0)
1643                 return ret;
1644         destroy_async_on_interface (ps, ifnum);
1645         return 0;
1646 }
1647
1648 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1649 {
1650         int                     size;
1651         void                    *buf = NULL;
1652         int                     retval = 0;
1653         struct usb_interface    *intf = NULL;
1654         struct usb_driver       *driver = NULL;
1655
1656         /* alloc buffer */
1657         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1658                 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1659                         return -ENOMEM;
1660                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1661                         if (copy_from_user(buf, ctl->data, size)) {
1662                                 kfree(buf);
1663                                 return -EFAULT;
1664                         }
1665                 } else {
1666                         memset(buf, 0, size);
1667                 }
1668         }
1669
1670         if (!connected(ps)) {
1671                 kfree(buf);
1672                 return -ENODEV;
1673         }
1674
1675         if (ps->dev->state != USB_STATE_CONFIGURED)
1676                 retval = -EHOSTUNREACH;
1677         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1678                 retval = -EINVAL;
1679         else switch (ctl->ioctl_code) {
1680
1681         /* disconnect kernel driver from interface */
1682         case USBDEVFS_DISCONNECT:
1683                 if (intf->dev.driver) {
1684                         driver = to_usb_driver(intf->dev.driver);
1685                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1686                         usb_driver_release_interface(driver, intf);
1687                 } else
1688                         retval = -ENODATA;
1689                 break;
1690
1691         /* let kernel drivers try to (re)bind to the interface */
1692         case USBDEVFS_CONNECT:
1693                 if (!intf->dev.driver)
1694                         retval = device_attach(&intf->dev);
1695                 else
1696                         retval = -EBUSY;
1697                 break;
1698
1699         /* talk directly to the interface's driver */
1700         default:
1701                 if (intf->dev.driver)
1702                         driver = to_usb_driver(intf->dev.driver);
1703                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1704                         retval = -ENOTTY;
1705                 } else {
1706                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1707                         if (retval == -ENOIOCTLCMD)
1708                                 retval = -ENOTTY;
1709                 }
1710         }
1711
1712         /* cleanup and return */
1713         if (retval >= 0
1714                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1715                         && size > 0
1716                         && copy_to_user(ctl->data, buf, size) != 0)
1717                 retval = -EFAULT;
1718
1719         kfree(buf);
1720         return retval;
1721 }
1722
1723 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1724 {
1725         struct usbdevfs_ioctl   ctrl;
1726
1727         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1728                 return -EFAULT;
1729         return proc_ioctl(ps, &ctrl);
1730 }
1731
1732 #ifdef CONFIG_COMPAT
1733 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1734 {
1735         struct usbdevfs_ioctl32 __user *uioc;
1736         struct usbdevfs_ioctl ctrl;
1737         u32 udata;
1738
1739         uioc = compat_ptr((long)arg);
1740         if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1741             __get_user(ctrl.ifno, &uioc->ifno) ||
1742             __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1743             __get_user(udata, &uioc->data))
1744                 return -EFAULT;
1745         ctrl.data = compat_ptr(udata);
1746
1747         return proc_ioctl(ps, &ctrl);
1748 }
1749 #endif
1750
1751 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1752 {
1753         unsigned portnum;
1754         int rc;
1755
1756         if (get_user(portnum, (unsigned __user *) arg))
1757                 return -EFAULT;
1758         rc = usb_hub_claim_port(ps->dev, portnum, ps);
1759         if (rc == 0)
1760                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1761                         portnum, task_pid_nr(current), current->comm);
1762         return rc;
1763 }
1764
1765 static int proc_release_port(struct dev_state *ps, void __user *arg)
1766 {
1767         unsigned portnum;
1768
1769         if (get_user(portnum, (unsigned __user *) arg))
1770                 return -EFAULT;
1771         return usb_hub_release_port(ps->dev, portnum, ps);
1772 }
1773
1774 /*
1775  * NOTE:  All requests here that have interface numbers as parameters
1776  * are assuming that somehow the configuration has been prevented from
1777  * changing.  But there's no mechanism to ensure that...
1778  */
1779 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1780                                 void __user *p)
1781 {
1782         struct dev_state *ps = file->private_data;
1783         struct inode *inode = file->f_path.dentry->d_inode;
1784         struct usb_device *dev = ps->dev;
1785         int ret = -ENOTTY;
1786
1787         if (!(file->f_mode & FMODE_WRITE))
1788                 return -EPERM;
1789
1790         usb_lock_device(dev);
1791         if (!connected(ps)) {
1792                 usb_unlock_device(dev);
1793                 return -ENODEV;
1794         }
1795
1796         switch (cmd) {
1797         case USBDEVFS_CONTROL:
1798                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1799                 ret = proc_control(ps, p);
1800                 if (ret >= 0)
1801                         inode->i_mtime = CURRENT_TIME;
1802                 break;
1803
1804         case USBDEVFS_BULK:
1805                 snoop(&dev->dev, "%s: BULK\n", __func__);
1806                 ret = proc_bulk(ps, p);
1807                 if (ret >= 0)
1808                         inode->i_mtime = CURRENT_TIME;
1809                 break;
1810
1811         case USBDEVFS_RESETEP:
1812                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1813                 ret = proc_resetep(ps, p);
1814                 if (ret >= 0)
1815                         inode->i_mtime = CURRENT_TIME;
1816                 break;
1817
1818         case USBDEVFS_RESET:
1819                 snoop(&dev->dev, "%s: RESET\n", __func__);
1820                 ret = proc_resetdevice(ps);
1821                 break;
1822
1823         case USBDEVFS_CLEAR_HALT:
1824                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1825                 ret = proc_clearhalt(ps, p);
1826                 if (ret >= 0)
1827                         inode->i_mtime = CURRENT_TIME;
1828                 break;
1829
1830         case USBDEVFS_GETDRIVER:
1831                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1832                 ret = proc_getdriver(ps, p);
1833                 break;
1834
1835         case USBDEVFS_CONNECTINFO:
1836                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1837                 ret = proc_connectinfo(ps, p);
1838                 break;
1839
1840         case USBDEVFS_SETINTERFACE:
1841                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1842                 ret = proc_setintf(ps, p);
1843                 break;
1844
1845         case USBDEVFS_SETCONFIGURATION:
1846                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1847                 ret = proc_setconfig(ps, p);
1848                 break;
1849
1850         case USBDEVFS_SUBMITURB:
1851                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1852                 ret = proc_submiturb(ps, p);
1853                 if (ret >= 0)
1854                         inode->i_mtime = CURRENT_TIME;
1855                 break;
1856
1857 #ifdef CONFIG_COMPAT
1858         case USBDEVFS_CONTROL32:
1859                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
1860                 ret = proc_control_compat(ps, p);
1861                 if (ret >= 0)
1862                         inode->i_mtime = CURRENT_TIME;
1863                 break;
1864
1865         case USBDEVFS_BULK32:
1866                 snoop(&dev->dev, "%s: BULK32\n", __func__);
1867                 ret = proc_bulk_compat(ps, p);
1868                 if (ret >= 0)
1869                         inode->i_mtime = CURRENT_TIME;
1870                 break;
1871
1872         case USBDEVFS_DISCSIGNAL32:
1873                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
1874                 ret = proc_disconnectsignal_compat(ps, p);
1875                 break;
1876
1877         case USBDEVFS_SUBMITURB32:
1878                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1879                 ret = proc_submiturb_compat(ps, p);
1880                 if (ret >= 0)
1881                         inode->i_mtime = CURRENT_TIME;
1882                 break;
1883
1884         case USBDEVFS_REAPURB32:
1885                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1886                 ret = proc_reapurb_compat(ps, p);
1887                 break;
1888
1889         case USBDEVFS_REAPURBNDELAY32:
1890                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
1891                 ret = proc_reapurbnonblock_compat(ps, p);
1892                 break;
1893
1894         case USBDEVFS_IOCTL32:
1895                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
1896                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1897                 break;
1898 #endif
1899
1900         case USBDEVFS_DISCARDURB:
1901                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1902                 ret = proc_unlinkurb(ps, p);
1903                 break;
1904
1905         case USBDEVFS_REAPURB:
1906                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1907                 ret = proc_reapurb(ps, p);
1908                 break;
1909
1910         case USBDEVFS_REAPURBNDELAY:
1911                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
1912                 ret = proc_reapurbnonblock(ps, p);
1913                 break;
1914
1915         case USBDEVFS_DISCSIGNAL:
1916                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1917                 ret = proc_disconnectsignal(ps, p);
1918                 break;
1919
1920         case USBDEVFS_CLAIMINTERFACE:
1921                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1922                 ret = proc_claiminterface(ps, p);
1923                 break;
1924
1925         case USBDEVFS_RELEASEINTERFACE:
1926                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1927                 ret = proc_releaseinterface(ps, p);
1928                 break;
1929
1930         case USBDEVFS_IOCTL:
1931                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1932                 ret = proc_ioctl_default(ps, p);
1933                 break;
1934
1935         case USBDEVFS_CLAIM_PORT:
1936                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
1937                 ret = proc_claim_port(ps, p);
1938                 break;
1939
1940         case USBDEVFS_RELEASE_PORT:
1941                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
1942                 ret = proc_release_port(ps, p);
1943                 break;
1944         }
1945         usb_unlock_device(dev);
1946         if (ret >= 0)
1947                 inode->i_atime = CURRENT_TIME;
1948         return ret;
1949 }
1950
1951 static long usbdev_ioctl(struct file *file, unsigned int cmd,
1952                         unsigned long arg)
1953 {
1954         int ret;
1955
1956         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
1957
1958         return ret;
1959 }
1960
1961 #ifdef CONFIG_COMPAT
1962 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
1963                         unsigned long arg)
1964 {
1965         int ret;
1966
1967         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
1968
1969         return ret;
1970 }
1971 #endif
1972
1973 /* No kernel lock - fine */
1974 static unsigned int usbdev_poll(struct file *file,
1975                                 struct poll_table_struct *wait)
1976 {
1977         struct dev_state *ps = file->private_data;
1978         unsigned int mask = 0;
1979
1980         poll_wait(file, &ps->wait, wait);
1981         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1982                 mask |= POLLOUT | POLLWRNORM;
1983         if (!connected(ps))
1984                 mask |= POLLERR | POLLHUP;
1985         return mask;
1986 }
1987
1988 const struct file_operations usbdev_file_operations = {
1989         .owner =          THIS_MODULE,
1990         .llseek =         usbdev_lseek,
1991         .read =           usbdev_read,
1992         .poll =           usbdev_poll,
1993         .unlocked_ioctl = usbdev_ioctl,
1994 #ifdef CONFIG_COMPAT
1995         .compat_ioctl =   usbdev_compat_ioctl,
1996 #endif
1997         .open =           usbdev_open,
1998         .release =        usbdev_release,
1999 };
2000
2001 static void usbdev_remove(struct usb_device *udev)
2002 {
2003         struct dev_state *ps;
2004         struct siginfo sinfo;
2005
2006         while (!list_empty(&udev->filelist)) {
2007                 ps = list_entry(udev->filelist.next, struct dev_state, list);
2008                 destroy_all_async(ps);
2009                 wake_up_all(&ps->wait);
2010                 list_del_init(&ps->list);
2011                 if (ps->discsignr) {
2012                         sinfo.si_signo = ps->discsignr;
2013                         sinfo.si_errno = EPIPE;
2014                         sinfo.si_code = SI_ASYNCIO;
2015                         sinfo.si_addr = ps->disccontext;
2016                         kill_pid_info_as_cred(ps->discsignr, &sinfo,
2017                                         ps->disc_pid, ps->cred, ps->secid);
2018                 }
2019         }
2020 }
2021
2022 #ifdef CONFIG_USB_DEVICE_CLASS
2023 static struct class *usb_classdev_class;
2024
2025 static int usb_classdev_add(struct usb_device *dev)
2026 {
2027         struct device *cldev;
2028
2029         cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
2030                               NULL, "usbdev%d.%d", dev->bus->busnum,
2031                               dev->devnum);
2032         if (IS_ERR(cldev))
2033                 return PTR_ERR(cldev);
2034         dev->usb_classdev = cldev;
2035         return 0;
2036 }
2037
2038 static void usb_classdev_remove(struct usb_device *dev)
2039 {
2040         if (dev->usb_classdev)
2041                 device_unregister(dev->usb_classdev);
2042 }
2043
2044 #else
2045 #define usb_classdev_add(dev)           0
2046 #define usb_classdev_remove(dev)        do {} while (0)
2047
2048 #endif
2049
2050 static int usbdev_notify(struct notifier_block *self,
2051                                unsigned long action, void *dev)
2052 {
2053         switch (action) {
2054         case USB_DEVICE_ADD:
2055                 if (usb_classdev_add(dev))
2056                         return NOTIFY_BAD;
2057                 break;
2058         case USB_DEVICE_REMOVE:
2059                 usb_classdev_remove(dev);
2060                 usbdev_remove(dev);
2061                 break;
2062         }
2063         return NOTIFY_OK;
2064 }
2065
2066 static struct notifier_block usbdev_nb = {
2067         .notifier_call =        usbdev_notify,
2068 };
2069
2070 static struct cdev usb_device_cdev;
2071
2072 int __init usb_devio_init(void)
2073 {
2074         int retval;
2075
2076         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2077                                         "usb_device");
2078         if (retval) {
2079                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2080                 goto out;
2081         }
2082         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2083         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2084         if (retval) {
2085                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2086                        USB_DEVICE_MAJOR);
2087                 goto error_cdev;
2088         }
2089 #ifdef CONFIG_USB_DEVICE_CLASS
2090         usb_classdev_class = class_create(THIS_MODULE, "usb_device");
2091         if (IS_ERR(usb_classdev_class)) {
2092                 printk(KERN_ERR "Unable to register usb_device class\n");
2093                 retval = PTR_ERR(usb_classdev_class);
2094                 cdev_del(&usb_device_cdev);
2095                 usb_classdev_class = NULL;
2096                 goto out;
2097         }
2098         /* devices of this class shadow the major:minor of their parent
2099          * device, so clear ->dev_kobj to prevent adding duplicate entries
2100          * to /sys/dev
2101          */
2102         usb_classdev_class->dev_kobj = NULL;
2103 #endif
2104         usb_register_notify(&usbdev_nb);
2105 out:
2106         return retval;
2107
2108 error_cdev:
2109         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2110         goto out;
2111 }
2112
2113 void usb_devio_cleanup(void)
2114 {
2115         usb_unregister_notify(&usbdev_nb);
2116 #ifdef CONFIG_USB_DEVICE_CLASS
2117         class_destroy(usb_classdev_class);
2118 #endif
2119         cdev_del(&usb_device_cdev);
2120         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2121 }