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