drivers/usb/core/devio.c

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