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