drivers/usb/core/devio.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *      devio.c  --  User space communication with USB devices.
   5  *
   6  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   7  *
   8  *      This program is free software; you can redistribute it and/or modify
   9  *      it under the terms of the GNU General Public License as published by
  10  *      the Free Software Foundation; either version 2 of the License, or
  11  *      (at your option) any later version.
  12  *
  13  *      This program is distributed in the hope that it will be useful,
  14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *      GNU General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License
  19  *      along with this program; if not, write to the Free Software
  20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  *  This file implements the usbfs/x/y files, where
  23  *  x is the bus number and y the device number.
  24  *
  25  *  It allows user space programs/"drivers" to communicate directly
  26  *  with USB devices without intervening kernel driver.
  27  *
  28  *  Revision history
  29  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  30  *    04.01.2000   0.2   Turned into its own filesystem
  31  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  32  *                       (CAN-2005-3055)
  33  */
  34
  35 /*****************************************************************************/
  36
  37 #include <linux/fs.h>
  38 #include <linux/mm.h>
  39 #include <linux/slab.h>
  40 #include <linux/signal.h>
  41 #include <linux/poll.h>
  42 #include <linux/module.h>
  43 #include <linux/usb.h>
  44 #include <linux/usbdevice_fs.h>
  45 #include <linux/usb/hcd.h>      /* for usbcore internals */
  46 #include <linux/cdev.h>
  47 #include <linux/notifier.h>
  48 #include <linux/security.h>
  49 #include <linux/user_namespace.h>
  50 #include <asm/uaccess.h>
  51 #include <asm/byteorder.h>
  52 #include <linux/moduleparam.h>
  53
  54 #include "usb.h"
  55
  56 #define USB_MAXBUS                      64
  57 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
  58
  59 /* Mutual exclusion for removal, open, and release */
  60 DEFINE_MUTEX(usbfs_mutex);
  61
  62 struct dev_state {
  63         struct list_head list;      /* state list */
  64         struct usb_device *dev;
  65         struct file *file;
  66         spinlock_t lock;            /* protects the async urb lists */
  67         struct list_head async_pending;
  68         struct list_head async_completed;
  69         wait_queue_head_t wait;     /* wake up if a request completed */
  70         unsigned int discsignr;
  71         struct pid *disc_pid;
  72         const struct cred *cred;
  73         void __user *disccontext;
  74         unsigned long ifclaimed;
  75         u32 secid;
  76         u32 disabled_bulk_eps;
  77 };
  78
  79 struct async {
  80         struct list_head asynclist;
  81         struct dev_state *ps;
  82         struct pid *pid;
  83         const struct cred *cred;
  84         unsigned int signr;
  85         unsigned int ifnum;
  86         void __user *userbuffer;
  87         void __user *userurb;
  88         struct urb *urb;
  89         int status;
  90         u32 secid;
  91         u8 bulk_addr;
  92         u8 bulk_status;
  93 };
  94
  95 static int usbfs_snoop;
  96 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  97 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
  98
  99 #define snoop(dev, format, arg...)                              \
 100         do {                                                    \
 101                 if (usbfs_snoop)                                \
 102                         dev_info(dev , format , ## arg);        \
 103         } while (0)
 104
 105 enum snoop_when {
 106         SUBMIT, COMPLETE
 107 };
 108
 109 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 110
 111 #define MAX_USBFS_BUFFER_SIZE   16384
 112
 113
 114 static int connected(struct dev_state *ps)
 115 {
 116         return (!list_empty(&ps->list) &&
 117                         ps->dev->state != USB_STATE_NOTATTACHED);
 118 }
 119
 120 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
 121 {
 122         loff_t ret;
 123
 124         mutex_lock(&file->f_dentry->d_inode->i_mutex);
 125
 126         switch (orig) {
 127         case 0:
 128                 file->f_pos = offset;
 129                 ret = file->f_pos;
 130                 break;
 131         case 1:
 132                 file->f_pos += offset;
 133                 ret = file->f_pos;
 134                 break;
 135         case 2:
 136         default:
 137                 ret = -EINVAL;
 138         }
 139
 140         mutex_unlock(&file->f_dentry->d_inode->i_mutex);
 141         return ret;
 142 }
 143
 144 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 145                            loff_t *ppos)
 146 {
 147         struct dev_state *ps = file->private_data;
 148         struct usb_device *dev = ps->dev;
 149         ssize_t ret = 0;
 150         unsigned len;
 151         loff_t pos;
 152         int i;
 153
 154         pos = *ppos;
 155         usb_lock_device(dev);
 156         if (!connected(ps)) {
 157                 ret = -ENODEV;
 158                 goto err;
 159         } else if (pos < 0) {
 160                 ret = -EINVAL;
 161                 goto err;
 162         }
 163
 164         if (pos < sizeof(struct usb_device_descriptor)) {
 165                 /* 18 bytes - fits on the stack */
 166                 struct usb_device_descriptor temp_desc;
 167
 168                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 169                 le16_to_cpus(&temp_desc.bcdUSB);
 170                 le16_to_cpus(&temp_desc.idVendor);
 171                 le16_to_cpus(&temp_desc.idProduct);
 172                 le16_to_cpus(&temp_desc.bcdDevice);
 173
 174                 len = sizeof(struct usb_device_descriptor) - pos;
 175                 if (len > nbytes)
 176                         len = nbytes;
 177                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 178                         ret = -EFAULT;
 179                         goto err;
 180                 }
 181
 182                 *ppos += len;
 183                 buf += len;
 184                 nbytes -= len;
 185                 ret += len;
 186         }
 187
 188         pos = sizeof(struct usb_device_descriptor);
 189         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 190                 struct usb_config_descriptor *config =
 191                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 192                 unsigned int length = le16_to_cpu(config->wTotalLength);
 193
 194                 if (*ppos < pos + length) {
 195
 196                         /* The descriptor may claim to be longer than it
 197                          * really is.  Here is the actual allocated length. */
 198                         unsigned alloclen =
 199                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 200
 201                         len = length - (*ppos - pos);
 202                         if (len > nbytes)
 203                                 len = nbytes;
 204
 205                         /* Simply don't write (skip over) unallocated parts */
 206                         if (alloclen > (*ppos - pos)) {
 207                                 alloclen -= (*ppos - pos);
 208                                 if (copy_to_user(buf,
 209                                     dev->rawdescriptors[i] + (*ppos - pos),
 210                                     min(len, alloclen))) {
 211                                         ret = -EFAULT;
 212                                         goto err;
 213                                 }
 214                         }
 215
 216                         *ppos += len;
 217                         buf += len;
 218                         nbytes -= len;
 219                         ret += len;
 220                 }
 221
 222                 pos += length;
 223         }
 224
 225 err:
 226         usb_unlock_device(dev);
 227         return ret;
 228 }
 229
 230 /*
 231  * async list handling
 232  */
 233
 234 static struct async *alloc_async(unsigned int numisoframes)
 235 {
 236         struct async *as;
 237
 238         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 239         if (!as)
 240                 return NULL;
 241         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 242         if (!as->urb) {
 243                 kfree(as);
 244                 return NULL;
 245         }
 246         return as;
 247 }
 248
 249 static void free_async(struct async *as)
 250 {
 251         put_pid(as->pid);
 252         if (as->cred)
 253                 put_cred(as->cred);
 254         kfree(as->urb->transfer_buffer);
 255         kfree(as->urb->setup_packet);
 256         usb_free_urb(as->urb);
 257         kfree(as);
 258 }
 259
 260 static void async_newpending(struct async *as)
 261 {
 262         struct dev_state *ps = as->ps;
 263         unsigned long flags;
 264
 265         spin_lock_irqsave(&ps->lock, flags);
 266         list_add_tail(&as->asynclist, &ps->async_pending);
 267         spin_unlock_irqrestore(&ps->lock, flags);
 268 }
 269
 270 static void async_removepending(struct async *as)
 271 {
 272         struct dev_state *ps = as->ps;
 273         unsigned long flags;
 274
 275         spin_lock_irqsave(&ps->lock, flags);
 276         list_del_init(&as->asynclist);
 277         spin_unlock_irqrestore(&ps->lock, flags);
 278 }
 279
 280 static struct async *async_getcompleted(struct dev_state *ps)
 281 {
 282         unsigned long flags;
 283         struct async *as = NULL;
 284
 285         spin_lock_irqsave(&ps->lock, flags);
 286         if (!list_empty(&ps->async_completed)) {
 287                 as = list_entry(ps->async_completed.next, struct async,
 288                                 asynclist);
 289                 list_del_init(&as->asynclist);
 290         }
 291         spin_unlock_irqrestore(&ps->lock, flags);
 292         return as;
 293 }
 294
 295 static struct async *async_getpending(struct dev_state *ps,
 296                                              void __user *userurb)
 297 {
 298         struct async *as;
 299
 300         list_for_each_entry(as, &ps->async_pending, asynclist)
 301                 if (as->userurb == userurb) {
 302                         list_del_init(&as->asynclist);
 303                         return as;
 304                 }
 305
 306         return NULL;
 307 }
 308
 309 static void snoop_urb(struct usb_device *udev,
 310                 void __user *userurb, int pipe, unsigned length,
 311                 int timeout_or_status, enum snoop_when when,
 312                 unsigned char *data, unsigned data_len)
 313 {
 314         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 315         static const char *dirs[] = {"out", "in"};
 316         int ep;
 317         const char *t, *d;
 318
 319         if (!usbfs_snoop)
 320                 return;
 321
 322         ep = usb_pipeendpoint(pipe);
 323         t = types[usb_pipetype(pipe)];
 324         d = dirs[!!usb_pipein(pipe)];
 325
 326         if (userurb) {          /* Async */
 327                 if (when == SUBMIT)
 328                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 329                                         "length %u\n",
 330                                         userurb, ep, t, d, length);
 331                 else
 332                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 333                                         "actual_length %u status %d\n",
 334                                         userurb, ep, t, d, length,
 335                                         timeout_or_status);
 336         } else {
 337                 if (when == SUBMIT)
 338                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 339                                         "timeout %d\n",
 340                                         ep, t, d, length, timeout_or_status);
 341                 else
 342                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 343                                         "status %d\n",
 344                                         ep, t, d, length, timeout_or_status);
 345         }
 346
 347         if (data && data_len > 0) {
 348                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 349                         data, data_len, 1);
 350         }
 351 }
 352
 353 #define AS_CONTINUATION 1
 354 #define AS_UNLINK       2
 355
 356 static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr)
 357 __releases(ps->lock)
 358 __acquires(ps->lock)
 359 {
 360         struct urb *urb;
 361         struct async *as;
 362
 363         /* Mark all the pending URBs that match bulk_addr, up to but not
 364          * including the first one without AS_CONTINUATION.  If such an
 365          * URB is encountered then a new transfer has already started so
 366          * the endpoint doesn't need to be disabled; otherwise it does.
 367          */
 368         list_for_each_entry(as, &ps->async_pending, asynclist) {
 369                 if (as->bulk_addr == bulk_addr) {
 370                         if (as->bulk_status != AS_CONTINUATION)
 371                                 goto rescan;
 372                         as->bulk_status = AS_UNLINK;
 373                         as->bulk_addr = 0;
 374                 }
 375         }
 376         ps->disabled_bulk_eps |= (1 << bulk_addr);
 377
 378         /* Now carefully unlink all the marked pending URBs */
 379  rescan:
 380         list_for_each_entry(as, &ps->async_pending, asynclist) {
 381                 if (as->bulk_status == AS_UNLINK) {
 382                         as->bulk_status = 0;            /* Only once */
 383                         urb = as->urb;
 384                         usb_get_urb(urb);
 385                         spin_unlock(&ps->lock);         /* Allow completions */
 386                         usb_unlink_urb(urb);
 387                         usb_put_urb(urb);
 388                         spin_lock(&ps->lock);
 389                         goto rescan;
 390                 }
 391         }
 392 }
 393
 394 static void async_completed(struct urb *urb)
 395 {
 396         struct async *as = urb->context;
 397         struct dev_state *ps = as->ps;
 398         struct siginfo sinfo;
 399         struct pid *pid = NULL;
 400         u32 secid = 0;
 401         const struct cred *cred = NULL;
 402         int signr;
 403
 404         spin_lock(&ps->lock);
 405         list_move_tail(&as->asynclist, &ps->async_completed);
 406         as->status = urb->status;
 407         signr = as->signr;
 408         if (signr) {
 409                 memset(&sinfo, 0, sizeof(sinfo));
 410                 sinfo.si_signo = as->signr;
 411                 sinfo.si_errno = as->status;
 412                 sinfo.si_code = SI_ASYNCIO;
 413                 sinfo.si_addr = as->userurb;
 414                 pid = get_pid(as->pid);
 415                 cred = get_cred(as->cred);
 416                 secid = as->secid;
 417         }
 418         snoop(&urb->dev->dev, "urb complete\n");
 419         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 420                         as->status, COMPLETE,
 421                         ((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_OUT) ?
 422                                 NULL : urb->transfer_buffer, urb->actual_length);
 423         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 424                         as->status != -ENOENT)
 425                 cancel_bulk_urbs(ps, as->bulk_addr);
 426         spin_unlock(&ps->lock);
 427
 428         if (signr) {
 429                 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
 430                 put_pid(pid);
 431                 put_cred(cred);
 432         }
 433
 434         wake_up(&ps->wait);
 435 }
 436
 437 static void destroy_async(struct dev_state *ps, struct list_head *list)
 438 {
 439         struct urb *urb;
 440         struct async *as;
 441         unsigned long flags;
 442
 443         spin_lock_irqsave(&ps->lock, flags);
 444         while (!list_empty(list)) {
 445                 as = list_entry(list->next, struct async, asynclist);
 446                 list_del_init(&as->asynclist);
 447                 urb = as->urb;
 448                 usb_get_urb(urb);
 449
 450                 /* drop the spinlock so the completion handler can run */
 451                 spin_unlock_irqrestore(&ps->lock, flags);
 452                 usb_kill_urb(urb);
 453                 usb_put_urb(urb);
 454                 spin_lock_irqsave(&ps->lock, flags);
 455         }
 456         spin_unlock_irqrestore(&ps->lock, flags);
 457 }
 458
 459 static void destroy_async_on_interface(struct dev_state *ps,
 460                                        unsigned int ifnum)
 461 {
 462         struct list_head *p, *q, hitlist;
 463         unsigned long flags;
 464
 465         INIT_LIST_HEAD(&hitlist);
 466         spin_lock_irqsave(&ps->lock, flags);
 467         list_for_each_safe(p, q, &ps->async_pending)
 468                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 469                         list_move_tail(p, &hitlist);
 470         spin_unlock_irqrestore(&ps->lock, flags);
 471         destroy_async(ps, &hitlist);
 472 }
 473
 474 static void destroy_all_async(struct dev_state *ps)
 475 {
 476         destroy_async(ps, &ps->async_pending);
 477 }
 478
 479 /*
 480  * interface claims are made only at the request of user level code,
 481  * which can also release them (explicitly or by closing files).
 482  * they're also undone when devices disconnect.
 483  */
 484
 485 static int driver_probe(struct usb_interface *intf,
 486                         const struct usb_device_id *id)
 487 {
 488         return -ENODEV;
 489 }
 490
 491 static void driver_disconnect(struct usb_interface *intf)
 492 {
 493         struct dev_state *ps = usb_get_intfdata(intf);
 494         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 495
 496         if (!ps)
 497                 return;
 498
 499         /* NOTE:  this relies on usbcore having canceled and completed
 500          * all pending I/O requests; 2.6 does that.
 501          */
 502
 503         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 504                 clear_bit(ifnum, &ps->ifclaimed);
 505         else
 506                 dev_warn(&intf->dev, "interface number %u out of range\n",
 507                          ifnum);
 508
 509         usb_set_intfdata(intf, NULL);
 510
 511         /* force async requests to complete */
 512         destroy_async_on_interface(ps, ifnum);
 513 }
 514
 515 /* The following routines are merely placeholders.  There is no way
 516  * to inform a user task about suspend or resumes.
 517  */
 518 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 519 {
 520         return 0;
 521 }
 522
 523 static int driver_resume(struct usb_interface *intf)
 524 {
 525         return 0;
 526 }
 527
 528 struct usb_driver usbfs_driver = {
 529         .name =         "usbfs",
 530         .probe =        driver_probe,
 531         .disconnect =   driver_disconnect,
 532         .suspend =      driver_suspend,
 533         .resume =       driver_resume,
 534 };
 535
 536 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 537 {
 538         struct usb_device *dev = ps->dev;
 539         struct usb_interface *intf;
 540         int err;
 541
 542         if (ifnum >= 8*sizeof(ps->ifclaimed))
 543                 return -EINVAL;
 544         /* already claimed */
 545         if (test_bit(ifnum, &ps->ifclaimed))
 546                 return 0;
 547
 548         intf = usb_ifnum_to_if(dev, ifnum);
 549         if (!intf)
 550                 err = -ENOENT;
 551         else
 552                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 553         if (err == 0)
 554                 set_bit(ifnum, &ps->ifclaimed);
 555         return err;
 556 }
 557
 558 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 559 {
 560         struct usb_device *dev;
 561         struct usb_interface *intf;
 562         int err;
 563
 564         err = -EINVAL;
 565         if (ifnum >= 8*sizeof(ps->ifclaimed))
 566                 return err;
 567         dev = ps->dev;
 568         intf = usb_ifnum_to_if(dev, ifnum);
 569         if (!intf)
 570                 err = -ENOENT;
 571         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 572                 usb_driver_release_interface(&usbfs_driver, intf);
 573                 err = 0;
 574         }
 575         return err;
 576 }
 577
 578 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 579 {
 580         if (ps->dev->state != USB_STATE_CONFIGURED)
 581                 return -EHOSTUNREACH;
 582         if (ifnum >= 8*sizeof(ps->ifclaimed))
 583                 return -EINVAL;
 584         if (test_bit(ifnum, &ps->ifclaimed))
 585                 return 0;
 586         /* if not yet claimed, claim it for the driver */
 587         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 588                  "interface %u before use\n", task_pid_nr(current),
 589                  current->comm, ifnum);
 590         return claimintf(ps, ifnum);
 591 }
 592
 593 static int findintfep(struct usb_device *dev, unsigned int ep)
 594 {
 595         unsigned int i, j, e;
 596         struct usb_interface *intf;
 597         struct usb_host_interface *alts;
 598         struct usb_endpoint_descriptor *endpt;
 599
 600         if (ep & ~(USB_DIR_IN|0xf))
 601                 return -EINVAL;
 602         if (!dev->actconfig)
 603                 return -ESRCH;
 604         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 605                 intf = dev->actconfig->interface[i];
 606                 for (j = 0; j < intf->num_altsetting; j++) {
 607                         alts = &intf->altsetting[j];
 608                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 609                                 endpt = &alts->endpoint[e].desc;
 610                                 if (endpt->bEndpointAddress == ep)
 611                                         return alts->desc.bInterfaceNumber;
 612                         }
 613                 }
 614         }
 615         return -ENOENT;
 616 }
 617
 618 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
 619                            unsigned int request, unsigned int index)
 620 {
 621         int ret = 0;
 622         struct usb_host_interface *alt_setting;
 623
 624         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 625          && ps->dev->state != USB_STATE_ADDRESS
 626          && ps->dev->state != USB_STATE_CONFIGURED)
 627                 return -EHOSTUNREACH;
 628         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 629                 return 0;
 630
 631         /*
 632          * check for the special corner case 'get_device_id' in the printer
 633          * class specification, where wIndex is (interface << 8 | altsetting)
 634          * instead of just interface
 635          */
 636         if (requesttype == 0xa1 && request == 0) {
 637                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
 638                                                    index >> 8, index & 0xff);
 639                 if (alt_setting
 640                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
 641                         index >>= 8;
 642         }
 643
 644         index &= 0xff;
 645         switch (requesttype & USB_RECIP_MASK) {
 646         case USB_RECIP_ENDPOINT:
 647                 if ((index & ~USB_DIR_IN) == 0)
 648                         return 0;
 649                 ret = findintfep(ps->dev, index);
 650                 if (ret < 0) {
 651                         /*
 652                          * Some not fully compliant Win apps seem to get
 653                          * index wrong and have the endpoint number here
 654                          * rather than the endpoint address (with the
 655                          * correct direction). Win does let this through,
 656                          * so we'll not reject it here but leave it to
 657                          * the device to not break KVM. But we warn.
 658                          */
 659                         ret = findintfep(ps->dev, index ^ 0x80);
 660                         if (ret >= 0)
 661                                 dev_info(&ps->dev->dev,
 662                                         "%s: process %i (%s) requesting ep %02x but needs %02x\n",
 663                                         __func__, task_pid_nr(current),
 664                                         current->comm, index, index ^ 0x80);
 665                 }
 666                 if (ret >= 0)
 667                         ret = checkintf(ps, ret);
 668                 break;
 669
 670         case USB_RECIP_INTERFACE:
 671                 ret = checkintf(ps, index);
 672                 break;
 673         }
 674         return ret;
 675 }
 676
 677 static int match_devt(struct device *dev, void *data)
 678 {
 679         return dev->devt == (dev_t) (unsigned long) data;
 680 }
 681
 682 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 683 {
 684         struct device *dev;
 685
 686         dev = bus_find_device(&usb_bus_type, NULL,
 687                               (void *) (unsigned long) devt, match_devt);
 688         if (!dev)
 689                 return NULL;
 690         return container_of(dev, struct usb_device, dev);
 691 }
 692
 693 /*
 694  * file operations
 695  */
 696 static int usbdev_open(struct inode *inode, struct file *file)
 697 {
 698         struct usb_device *dev = NULL;
 699         struct dev_state *ps;
 700         int ret;
 701
 702         ret = -ENOMEM;
 703         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
 704         if (!ps)
 705                 goto out_free_ps;
 706
 707         ret = -ENODEV;
 708
 709         /* Protect against simultaneous removal or release */
 710         mutex_lock(&usbfs_mutex);
 711
 712         /* usbdev device-node */
 713         if (imajor(inode) == USB_DEVICE_MAJOR)
 714                 dev = usbdev_lookup_by_devt(inode->i_rdev);
 715
 716 #ifdef CONFIG_USB_DEVICEFS
 717         /* procfs file */
 718         if (!dev) {
 719                 dev = inode->i_private;
 720                 if (dev && dev->usbfs_dentry &&
 721                                         dev->usbfs_dentry->d_inode == inode)
 722                         usb_get_dev(dev);
 723                 else
 724                         dev = NULL;
 725         }
 726 #endif
 727         mutex_unlock(&usbfs_mutex);
 728
 729         if (!dev)
 730                 goto out_free_ps;
 731
 732         usb_lock_device(dev);
 733         if (dev->state == USB_STATE_NOTATTACHED)
 734                 goto out_unlock_device;
 735
 736         ret = usb_autoresume_device(dev);
 737         if (ret)
 738                 goto out_unlock_device;
 739
 740         ps->dev = dev;
 741         ps->file = file;
 742         spin_lock_init(&ps->lock);
 743         INIT_LIST_HEAD(&ps->list);
 744         INIT_LIST_HEAD(&ps->async_pending);
 745         INIT_LIST_HEAD(&ps->async_completed);
 746         init_waitqueue_head(&ps->wait);
 747         ps->discsignr = 0;
 748         ps->disc_pid = get_pid(task_pid(current));
 749         ps->cred = get_current_cred();
 750         ps->disccontext = NULL;
 751         ps->ifclaimed = 0;
 752         security_task_getsecid(current, &ps->secid);
 753         smp_wmb();
 754         list_add_tail(&ps->list, &dev->filelist);
 755         file->private_data = ps;
 756         usb_unlock_device(dev);
 757         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
 758                         current->comm);
 759         return ret;
 760
 761  out_unlock_device:
 762         usb_unlock_device(dev);
 763         usb_put_dev(dev);
 764  out_free_ps:
 765         kfree(ps);
 766         return ret;
 767 }
 768
 769 static int usbdev_release(struct inode *inode, struct file *file)
 770 {
 771         struct dev_state *ps = file->private_data;
 772         struct usb_device *dev = ps->dev;
 773         unsigned int ifnum;
 774         struct async *as;
 775
 776         usb_lock_device(dev);
 777         usb_hub_release_all_ports(dev, ps);
 778
 779         list_del_init(&ps->list);
 780
 781         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 782                         ifnum++) {
 783                 if (test_bit(ifnum, &ps->ifclaimed))
 784                         releaseintf(ps, ifnum);
 785         }
 786         destroy_all_async(ps);
 787         usb_autosuspend_device(dev);
 788         usb_unlock_device(dev);
 789         usb_put_dev(dev);
 790         put_pid(ps->disc_pid);
 791         put_cred(ps->cred);
 792
 793         as = async_getcompleted(ps);
 794         while (as) {
 795                 free_async(as);
 796                 as = async_getcompleted(ps);
 797         }
 798         kfree(ps);
 799         return 0;
 800 }
 801
 802 static int proc_control(struct dev_state *ps, void __user *arg)
 803 {
 804         struct usb_device *dev = ps->dev;
 805         struct usbdevfs_ctrltransfer ctrl;
 806         unsigned int tmo;
 807         unsigned char *tbuf;
 808         unsigned wLength;
 809         int i, pipe, ret;
 810
 811         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 812                 return -EFAULT;
 813         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
 814                               ctrl.wIndex);
 815         if (ret)
 816                 return ret;
 817         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
 818         if (wLength > PAGE_SIZE)
 819                 return -EINVAL;
 820         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
 821         if (!tbuf)
 822                 return -ENOMEM;
 823         tmo = ctrl.timeout;
 824         snoop(&dev->dev, "control urb: bRequestType=%02x "
 825                 "bRequest=%02x wValue=%04x "
 826                 "wIndex=%04x wLength=%04x\n",
 827                 ctrl.bRequestType, ctrl.bRequest,
 828                 __le16_to_cpup(&ctrl.wValue),
 829                 __le16_to_cpup(&ctrl.wIndex),
 830                 __le16_to_cpup(&ctrl.wLength));
 831         if (ctrl.bRequestType & 0x80) {
 832                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
 833                                                ctrl.wLength)) {
 834                         free_page((unsigned long)tbuf);
 835                         return -EINVAL;
 836                 }
 837                 pipe = usb_rcvctrlpipe(dev, 0);
 838                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
 839
 840                 usb_unlock_device(dev);
 841                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
 842                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 843                                     tbuf, ctrl.wLength, tmo);
 844                 usb_lock_device(dev);
 845                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
 846                           tbuf, max(i, 0));
 847                 if ((i > 0) && ctrl.wLength) {
 848                         if (copy_to_user(ctrl.data, tbuf, i)) {
 849                                 free_page((unsigned long)tbuf);
 850                                 return -EFAULT;
 851                         }
 852                 }
 853         } else {
 854                 if (ctrl.wLength) {
 855                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 856                                 free_page((unsigned long)tbuf);
 857                                 return -EFAULT;
 858                         }
 859                 }
 860                 pipe = usb_sndctrlpipe(dev, 0);
 861                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
 862                         tbuf, ctrl.wLength);
 863
 864                 usb_unlock_device(dev);
 865                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
 866                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 867                                     tbuf, ctrl.wLength, tmo);
 868                 usb_lock_device(dev);
 869                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
 870         }
 871         free_page((unsigned long)tbuf);
 872         if (i < 0 && i != -EPIPE) {
 873                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 874                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 875                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 876                            ctrl.wLength, i);
 877         }
 878         return i;
 879 }
 880
 881 static int proc_bulk(struct dev_state *ps, void __user *arg)
 882 {
 883         struct usb_device *dev = ps->dev;
 884         struct usbdevfs_bulktransfer bulk;
 885         unsigned int tmo, len1, pipe;
 886         int len2;
 887         unsigned char *tbuf;
 888         int i, ret;
 889
 890         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 891                 return -EFAULT;
 892         ret = findintfep(ps->dev, bulk.ep);
 893         if (ret < 0)
 894                 return ret;
 895         ret = checkintf(ps, ret);
 896         if (ret)
 897                 return ret;
 898         if (bulk.ep & USB_DIR_IN)
 899                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 900         else
 901                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 902         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 903                 return -EINVAL;
 904         len1 = bulk.len;
 905         if (len1 > MAX_USBFS_BUFFER_SIZE)
 906                 return -EINVAL;
 907         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 908                 return -ENOMEM;
 909         tmo = bulk.timeout;
 910         if (bulk.ep & 0x80) {
 911                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 912                         kfree(tbuf);
 913                         return -EINVAL;
 914                 }
 915                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
 916
 917                 usb_unlock_device(dev);
 918                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 919                 usb_lock_device(dev);
 920                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
 921
 922                 if (!i && len2) {
 923                         if (copy_to_user(bulk.data, tbuf, len2)) {
 924                                 kfree(tbuf);
 925                                 return -EFAULT;
 926                         }
 927                 }
 928         } else {
 929                 if (len1) {
 930                         if (copy_from_user(tbuf, bulk.data, len1)) {
 931                                 kfree(tbuf);
 932                                 return -EFAULT;
 933                         }
 934                 }
 935                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
 936
 937                 usb_unlock_device(dev);
 938                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 939                 usb_lock_device(dev);
 940                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
 941         }
 942         kfree(tbuf);
 943         if (i < 0)
 944                 return i;
 945         return len2;
 946 }
 947
 948 static int proc_resetep(struct dev_state *ps, void __user *arg)
 949 {
 950         unsigned int ep;
 951         int ret;
 952
 953         if (get_user(ep, (unsigned int __user *)arg))
 954                 return -EFAULT;
 955         ret = findintfep(ps->dev, ep);
 956         if (ret < 0)
 957                 return ret;
 958         ret = checkintf(ps, ret);
 959         if (ret)
 960                 return ret;
 961         usb_reset_endpoint(ps->dev, ep);
 962         return 0;
 963 }
 964
 965 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 966 {
 967         unsigned int ep;
 968         int pipe;
 969         int ret;
 970
 971         if (get_user(ep, (unsigned int __user *)arg))
 972                 return -EFAULT;
 973         ret = findintfep(ps->dev, ep);
 974         if (ret < 0)
 975                 return ret;
 976         ret = checkintf(ps, ret);
 977         if (ret)
 978                 return ret;
 979         if (ep & USB_DIR_IN)
 980                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 981         else
 982                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 983
 984         return usb_clear_halt(ps->dev, pipe);
 985 }
 986
 987 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 988 {
 989         struct usbdevfs_getdriver gd;
 990         struct usb_interface *intf;
 991         int ret;
 992
 993         if (copy_from_user(&gd, arg, sizeof(gd)))
 994                 return -EFAULT;
 995         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 996         if (!intf || !intf->dev.driver)
 997                 ret = -ENODATA;
 998         else {
 999                 strncpy(gd.driver, intf->dev.driver->name,
1000                                 sizeof(gd.driver));
1001                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1002         }
1003         return ret;
1004 }
1005
1006 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
1007 {
1008         struct usbdevfs_connectinfo ci = {
1009                 .devnum = ps->dev->devnum,
1010                 .slow = ps->dev->speed == USB_SPEED_LOW
1011         };
1012
1013         if (copy_to_user(arg, &ci, sizeof(ci)))
1014                 return -EFAULT;
1015         return 0;
1016 }
1017
1018 static int proc_resetdevice(struct dev_state *ps)
1019 {
1020         return usb_reset_device(ps->dev);
1021 }
1022
1023 static int proc_setintf(struct dev_state *ps, void __user *arg)
1024 {
1025         struct usbdevfs_setinterface setintf;
1026         int ret;
1027
1028         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1029                 return -EFAULT;
1030         if ((ret = checkintf(ps, setintf.interface)))
1031                 return ret;
1032         return usb_set_interface(ps->dev, setintf.interface,
1033                         setintf.altsetting);
1034 }
1035
1036 static int proc_setconfig(struct dev_state *ps, void __user *arg)
1037 {
1038         int u;
1039         int status = 0;
1040         struct usb_host_config *actconfig;
1041
1042         if (get_user(u, (int __user *)arg))
1043                 return -EFAULT;
1044
1045         actconfig = ps->dev->actconfig;
1046
1047         /* Don't touch the device if any interfaces are claimed.
1048          * It could interfere with other drivers' operations, and if
1049          * an interface is claimed by usbfs it could easily deadlock.
1050          */
1051         if (actconfig) {
1052                 int i;
1053
1054                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1055                         if (usb_interface_claimed(actconfig->interface[i])) {
1056                                 dev_warn(&ps->dev->dev,
1057                                         "usbfs: interface %d claimed by %s "
1058                                         "while '%s' sets config #%d\n",
1059                                         actconfig->interface[i]
1060                                                 ->cur_altsetting
1061                                                 ->desc.bInterfaceNumber,
1062                                         actconfig->interface[i]
1063                                                 ->dev.driver->name,
1064                                         current->comm, u);
1065                                 status = -EBUSY;
1066                                 break;
1067                         }
1068                 }
1069         }
1070
1071         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1072          * so avoid usb_set_configuration()'s kick to sysfs
1073          */
1074         if (status == 0) {
1075                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1076                         status = usb_reset_configuration(ps->dev);
1077                 else
1078                         status = usb_set_configuration(ps->dev, u);
1079         }
1080
1081         return status;
1082 }
1083
1084 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1085                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1086                         void __user *arg)
1087 {
1088         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1089         struct usb_host_endpoint *ep;
1090         struct async *as;
1091         struct usb_ctrlrequest *dr = NULL;
1092         unsigned int u, totlen, isofrmlen;
1093         int ret, ifnum = -1;
1094         int is_in;
1095
1096         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1097                                 USBDEVFS_URB_SHORT_NOT_OK |
1098                                 USBDEVFS_URB_BULK_CONTINUATION |
1099                                 USBDEVFS_URB_NO_FSBR |
1100                                 USBDEVFS_URB_ZERO_PACKET |
1101                                 USBDEVFS_URB_NO_INTERRUPT))
1102                 return -EINVAL;
1103         if (uurb->buffer_length > 0 && !uurb->buffer)
1104                 return -EINVAL;
1105         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1106             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1107                 ifnum = findintfep(ps->dev, uurb->endpoint);
1108                 if (ifnum < 0)
1109                         return ifnum;
1110                 ret = checkintf(ps, ifnum);
1111                 if (ret)
1112                         return ret;
1113         }
1114         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1115                 is_in = 1;
1116                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1117         } else {
1118                 is_in = 0;
1119                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1120         }
1121         if (!ep)
1122                 return -ENOENT;
1123         switch(uurb->type) {
1124         case USBDEVFS_URB_TYPE_CONTROL:
1125                 if (!usb_endpoint_xfer_control(&ep->desc))
1126                         return -EINVAL;
1127                 /* min 8 byte setup packet,
1128                  * max 8 byte setup plus an arbitrary data stage */
1129                 if (uurb->buffer_length < 8 ||
1130                     uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1131                         return -EINVAL;
1132                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1133                 if (!dr)
1134                         return -ENOMEM;
1135                 if (copy_from_user(dr, uurb->buffer, 8)) {
1136                         kfree(dr);
1137                         return -EFAULT;
1138                 }
1139                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1140                         kfree(dr);
1141                         return -EINVAL;
1142                 }
1143                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1144                                       le16_to_cpup(&dr->wIndex));
1145                 if (ret) {
1146                         kfree(dr);
1147                         return ret;
1148                 }
1149                 uurb->number_of_packets = 0;
1150                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1151                 uurb->buffer += 8;
1152                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1153                         is_in = 1;
1154                         uurb->endpoint |= USB_DIR_IN;
1155                 } else {
1156                         is_in = 0;
1157                         uurb->endpoint &= ~USB_DIR_IN;
1158                 }
1159                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1160                         "bRequest=%02x wValue=%04x "
1161                         "wIndex=%04x wLength=%04x\n",
1162                         dr->bRequestType, dr->bRequest,
1163                         __le16_to_cpup(&dr->wValue),
1164                         __le16_to_cpup(&dr->wIndex),
1165                         __le16_to_cpup(&dr->wLength));
1166                 break;
1167
1168         case USBDEVFS_URB_TYPE_BULK:
1169                 switch (usb_endpoint_type(&ep->desc)) {
1170                 case USB_ENDPOINT_XFER_CONTROL:
1171                 case USB_ENDPOINT_XFER_ISOC:
1172                         return -EINVAL;
1173                 case USB_ENDPOINT_XFER_INT:
1174                         /* allow single-shot interrupt transfers */
1175                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1176                         goto interrupt_urb;
1177                 }
1178                 uurb->number_of_packets = 0;
1179                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1180                         return -EINVAL;
1181                 break;
1182
1183         case USBDEVFS_URB_TYPE_INTERRUPT:
1184                 if (!usb_endpoint_xfer_int(&ep->desc))
1185                         return -EINVAL;
1186  interrupt_urb:
1187                 uurb->number_of_packets = 0;
1188                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1189                         return -EINVAL;
1190                 break;
1191
1192         case USBDEVFS_URB_TYPE_ISO:
1193                 /* arbitrary limit */
1194                 if (uurb->number_of_packets < 1 ||
1195                     uurb->number_of_packets > 128)
1196                         return -EINVAL;
1197                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1198                         return -EINVAL;
1199                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1200                                    uurb->number_of_packets;
1201                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1202                         return -ENOMEM;
1203                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1204                         kfree(isopkt);
1205                         return -EFAULT;
1206                 }
1207                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1208                         /* arbitrary limit,
1209                          * sufficient for USB 2.0 high-bandwidth iso */
1210                         if (isopkt[u].length > 8192) {
1211                                 kfree(isopkt);
1212                                 return -EINVAL;
1213                         }
1214                         totlen += isopkt[u].length;
1215                 }
1216                 /* 3072 * 64 microframes */
1217                 if (totlen > 196608) {
1218                         kfree(isopkt);
1219                         return -EINVAL;
1220                 }
1221                 uurb->buffer_length = totlen;
1222                 break;
1223
1224         default:
1225                 return -EINVAL;
1226         }
1227         if (uurb->buffer_length > 0 &&
1228                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1229                                 uurb->buffer, uurb->buffer_length)) {
1230                 kfree(isopkt);
1231                 kfree(dr);
1232                 return -EFAULT;
1233         }
1234         as = alloc_async(uurb->number_of_packets);
1235         if (!as) {
1236                 kfree(isopkt);
1237                 kfree(dr);
1238                 return -ENOMEM;
1239         }
1240         if (uurb->buffer_length > 0) {
1241                 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1242                                 GFP_KERNEL);
1243                 if (!as->urb->transfer_buffer) {
1244                         kfree(isopkt);
1245                         kfree(dr);
1246                         free_async(as);
1247                         return -ENOMEM;
1248                 }
1249                 /* Isochronous input data may end up being discontiguous
1250                  * if some of the packets are short.  Clear the buffer so
1251                  * that the gaps don't leak kernel data to userspace.
1252                  */
1253                 if (is_in && uurb->type == USBDEVFS_URB_TYPE_ISO)
1254                         memset(as->urb->transfer_buffer, 0,
1255                                         uurb->buffer_length);
1256         }
1257         as->urb->dev = ps->dev;
1258         as->urb->pipe = (uurb->type << 30) |
1259                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1260                         (uurb->endpoint & USB_DIR_IN);
1261
1262         /* This tedious sequence is necessary because the URB_* flags
1263          * are internal to the kernel and subject to change, whereas
1264          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1265          */
1266         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1267         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1268                 u |= URB_ISO_ASAP;
1269         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1270                 u |= URB_SHORT_NOT_OK;
1271         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1272                 u |= URB_NO_FSBR;
1273         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1274                 u |= URB_ZERO_PACKET;
1275         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1276                 u |= URB_NO_INTERRUPT;
1277         as->urb->transfer_flags = u;
1278
1279         as->urb->transfer_buffer_length = uurb->buffer_length;
1280         as->urb->setup_packet = (unsigned char *)dr;
1281         as->urb->start_frame = uurb->start_frame;
1282         as->urb->number_of_packets = uurb->number_of_packets;
1283         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1284                         ps->dev->speed == USB_SPEED_HIGH)
1285                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1286         else
1287                 as->urb->interval = ep->desc.bInterval;
1288         as->urb->context = as;
1289         as->urb->complete = async_completed;
1290         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1291                 as->urb->iso_frame_desc[u].offset = totlen;
1292                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1293                 totlen += isopkt[u].length;
1294         }
1295         kfree(isopkt);
1296         as->ps = ps;
1297         as->userurb = arg;
1298         if (is_in && uurb->buffer_length > 0)
1299                 as->userbuffer = uurb->buffer;
1300         else
1301                 as->userbuffer = NULL;
1302         as->signr = uurb->signr;
1303         as->ifnum = ifnum;
1304         as->pid = get_pid(task_pid(current));
1305         as->cred = get_current_cred();
1306         security_task_getsecid(current, &as->secid);
1307         if (!is_in && uurb->buffer_length > 0) {
1308                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1309                                 uurb->buffer_length)) {
1310                         free_async(as);
1311                         return -EFAULT;
1312                 }
1313         }
1314         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1315                         as->urb->transfer_buffer_length, 0, SUBMIT,
1316                         is_in ? NULL : as->urb->transfer_buffer,
1317                                 uurb->buffer_length);
1318         async_newpending(as);
1319
1320         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1321                 spin_lock_irq(&ps->lock);
1322
1323                 /* Not exactly the endpoint address; the direction bit is
1324                  * shifted to the 0x10 position so that the value will be
1325                  * between 0 and 31.
1326                  */
1327                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1328                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1329                                 >> 3);
1330
1331                 /* If this bulk URB is the start of a new transfer, re-enable
1332                  * the endpoint.  Otherwise mark it as a continuation URB.
1333                  */
1334                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1335                         as->bulk_status = AS_CONTINUATION;
1336                 else
1337                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1338
1339                 /* Don't accept continuation URBs if the endpoint is
1340                  * disabled because of an earlier error.
1341                  */
1342                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1343                         ret = -EREMOTEIO;
1344                 else
1345                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1346                 spin_unlock_irq(&ps->lock);
1347         } else {
1348                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1349         }
1350
1351         if (ret) {
1352                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1353                            "usbfs: usb_submit_urb returned %d\n", ret);
1354                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1355                                 0, ret, COMPLETE, NULL, 0);
1356                 async_removepending(as);
1357                 free_async(as);
1358                 return ret;
1359         }
1360         return 0;
1361 }
1362
1363 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1364 {
1365         struct usbdevfs_urb uurb;
1366
1367         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1368                 return -EFAULT;
1369
1370         return proc_do_submiturb(ps, &uurb,
1371                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1372                         arg);
1373 }
1374
1375 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1376 {
1377         struct urb *urb;
1378         struct async *as;
1379         unsigned long flags;
1380
1381         spin_lock_irqsave(&ps->lock, flags);
1382         as = async_getpending(ps, arg);
1383         if (!as) {
1384                 spin_unlock_irqrestore(&ps->lock, flags);
1385                 return -EINVAL;
1386         }
1387
1388         urb = as->urb;
1389         usb_get_urb(urb);
1390         spin_unlock_irqrestore(&ps->lock, flags);
1391
1392         usb_kill_urb(urb);
1393         usb_put_urb(urb);
1394
1395         return 0;
1396 }
1397
1398 static int processcompl(struct async *as, void __user * __user *arg)
1399 {
1400         struct urb *urb = as->urb;
1401         struct usbdevfs_urb __user *userurb = as->userurb;
1402         void __user *addr = as->userurb;
1403         unsigned int i;
1404
1405         if (as->userbuffer && urb->actual_length) {
1406                 if (urb->number_of_packets > 0)         /* Isochronous */
1407                         i = urb->transfer_buffer_length;
1408                 else                                    /* Non-Isoc */
1409                         i = urb->actual_length;
1410                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, i))
1411                         goto err_out;
1412         }
1413         if (put_user(as->status, &userurb->status))
1414                 goto err_out;
1415         if (put_user(urb->actual_length, &userurb->actual_length))
1416                 goto err_out;
1417         if (put_user(urb->error_count, &userurb->error_count))
1418                 goto err_out;
1419
1420         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1421                 for (i = 0; i < urb->number_of_packets; i++) {
1422                         if (put_user(urb->iso_frame_desc[i].actual_length,
1423                                      &userurb->iso_frame_desc[i].actual_length))
1424                                 goto err_out;
1425                         if (put_user(urb->iso_frame_desc[i].status,
1426                                      &userurb->iso_frame_desc[i].status))
1427                                 goto err_out;
1428                 }
1429         }
1430
1431         if (put_user(addr, (void __user * __user *)arg))
1432                 return -EFAULT;
1433         return 0;
1434
1435 err_out:
1436         return -EFAULT;
1437 }
1438
1439 static struct async *reap_as(struct dev_state *ps)
1440 {
1441         DECLARE_WAITQUEUE(wait, current);
1442         struct async *as = NULL;
1443         struct usb_device *dev = ps->dev;
1444
1445         add_wait_queue(&ps->wait, &wait);
1446         for (;;) {
1447                 __set_current_state(TASK_INTERRUPTIBLE);
1448                 as = async_getcompleted(ps);
1449                 if (as)
1450                         break;
1451                 if (signal_pending(current))
1452                         break;
1453                 usb_unlock_device(dev);
1454                 schedule();
1455                 usb_lock_device(dev);
1456         }
1457         remove_wait_queue(&ps->wait, &wait);
1458         set_current_state(TASK_RUNNING);
1459         return as;
1460 }
1461
1462 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1463 {
1464         struct async *as = reap_as(ps);
1465         if (as) {
1466                 int retval = processcompl(as, (void __user * __user *)arg);
1467                 free_async(as);
1468                 return retval;
1469         }
1470         if (signal_pending(current))
1471                 return -EINTR;
1472         return -EIO;
1473 }
1474
1475 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1476 {
1477         int retval;
1478         struct async *as;
1479
1480         as = async_getcompleted(ps);
1481         retval = -EAGAIN;
1482         if (as) {
1483                 retval = processcompl(as, (void __user * __user *)arg);
1484                 free_async(as);
1485         }
1486         return retval;
1487 }
1488
1489 #ifdef CONFIG_COMPAT
1490 static int proc_control_compat(struct dev_state *ps,
1491                                 struct usbdevfs_ctrltransfer32 __user *p32)
1492 {
1493         struct usbdevfs_ctrltransfer __user *p;
1494         __u32 udata;
1495         p = compat_alloc_user_space(sizeof(*p));
1496         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1497             get_user(udata, &p32->data) ||
1498             put_user(compat_ptr(udata), &p->data))
1499                 return -EFAULT;
1500         return proc_control(ps, p);
1501 }
1502
1503 static int proc_bulk_compat(struct dev_state *ps,
1504                         struct usbdevfs_bulktransfer32 __user *p32)
1505 {
1506         struct usbdevfs_bulktransfer __user *p;
1507         compat_uint_t n;
1508         compat_caddr_t addr;
1509
1510         p = compat_alloc_user_space(sizeof(*p));
1511
1512         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1513             get_user(n, &p32->len) || put_user(n, &p->len) ||
1514             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1515             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1516                 return -EFAULT;
1517
1518         return proc_bulk(ps, p);
1519 }
1520 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1521 {
1522         struct usbdevfs_disconnectsignal32 ds;
1523
1524         if (copy_from_user(&ds, arg, sizeof(ds)))
1525                 return -EFAULT;
1526         ps->discsignr = ds.signr;
1527         ps->disccontext = compat_ptr(ds.context);
1528         return 0;
1529 }
1530
1531 static int get_urb32(struct usbdevfs_urb *kurb,
1532                      struct usbdevfs_urb32 __user *uurb)
1533 {
1534         __u32  uptr;
1535         if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1536             __get_user(kurb->type, &uurb->type) ||
1537             __get_user(kurb->endpoint, &uurb->endpoint) ||
1538             __get_user(kurb->status, &uurb->status) ||
1539             __get_user(kurb->flags, &uurb->flags) ||
1540             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1541             __get_user(kurb->actual_length, &uurb->actual_length) ||
1542             __get_user(kurb->start_frame, &uurb->start_frame) ||
1543             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1544             __get_user(kurb->error_count, &uurb->error_count) ||
1545             __get_user(kurb->signr, &uurb->signr))
1546                 return -EFAULT;
1547
1548         if (__get_user(uptr, &uurb->buffer))
1549                 return -EFAULT;
1550         kurb->buffer = compat_ptr(uptr);
1551         if (__get_user(uptr, &uurb->usercontext))
1552                 return -EFAULT;
1553         kurb->usercontext = compat_ptr(uptr);
1554
1555         return 0;
1556 }
1557
1558 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1559 {
1560         struct usbdevfs_urb uurb;
1561
1562         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1563                 return -EFAULT;
1564
1565         return proc_do_submiturb(ps, &uurb,
1566                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1567                         arg);
1568 }
1569
1570 static int processcompl_compat(struct async *as, void __user * __user *arg)
1571 {
1572         struct urb *urb = as->urb;
1573         struct usbdevfs_urb32 __user *userurb = as->userurb;
1574         void __user *addr = as->userurb;
1575         unsigned int i;
1576
1577         if (as->userbuffer && urb->actual_length) {
1578                 if (urb->number_of_packets > 0)         /* Isochronous */
1579                         i = urb->transfer_buffer_length;
1580                 else                                    /* Non-Isoc */
1581                         i = urb->actual_length;
1582                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, i))
1583                         return -EFAULT;
1584         }
1585         if (put_user(as->status, &userurb->status))
1586                 return -EFAULT;
1587         if (put_user(urb->actual_length, &userurb->actual_length))
1588                 return -EFAULT;
1589         if (put_user(urb->error_count, &userurb->error_count))
1590                 return -EFAULT;
1591
1592         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1593                 for (i = 0; i < urb->number_of_packets; i++) {
1594                         if (put_user(urb->iso_frame_desc[i].actual_length,
1595                                      &userurb->iso_frame_desc[i].actual_length))
1596                                 return -EFAULT;
1597                         if (put_user(urb->iso_frame_desc[i].status,
1598                                      &userurb->iso_frame_desc[i].status))
1599                                 return -EFAULT;
1600                 }
1601         }
1602
1603         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1604                 return -EFAULT;
1605         return 0;
1606 }
1607
1608 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1609 {
1610         struct async *as = reap_as(ps);
1611         if (as) {
1612                 int retval = processcompl_compat(as, (void __user * __user *)arg);
1613                 free_async(as);
1614                 return retval;
1615         }
1616         if (signal_pending(current))
1617                 return -EINTR;
1618         return -EIO;
1619 }
1620
1621 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1622 {
1623         int retval;
1624         struct async *as;
1625
1626         retval = -EAGAIN;
1627         as = async_getcompleted(ps);
1628         if (as) {
1629                 retval = processcompl_compat(as, (void __user * __user *)arg);
1630                 free_async(as);
1631         }
1632         return retval;
1633 }
1634
1635
1636 #endif
1637
1638 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1639 {
1640         struct usbdevfs_disconnectsignal ds;
1641
1642         if (copy_from_user(&ds, arg, sizeof(ds)))
1643                 return -EFAULT;
1644         ps->discsignr = ds.signr;
1645         ps->disccontext = ds.context;
1646         return 0;
1647 }
1648
1649 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1650 {
1651         unsigned int ifnum;
1652
1653         if (get_user(ifnum, (unsigned int __user *)arg))
1654                 return -EFAULT;
1655         return claimintf(ps, ifnum);
1656 }
1657
1658 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1659 {
1660         unsigned int ifnum;
1661         int ret;
1662
1663         if (get_user(ifnum, (unsigned int __user *)arg))
1664                 return -EFAULT;
1665         if ((ret = releaseintf(ps, ifnum)) < 0)
1666                 return ret;
1667         destroy_async_on_interface (ps, ifnum);
1668         return 0;
1669 }
1670
1671 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1672 {
1673         int                     size;
1674         void                    *buf = NULL;
1675         int                     retval = 0;
1676         struct usb_interface    *intf = NULL;
1677         struct usb_driver       *driver = NULL;
1678
1679         /* alloc buffer */
1680         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1681                 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1682                         return -ENOMEM;
1683                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1684                         if (copy_from_user(buf, ctl->data, size)) {
1685                                 kfree(buf);
1686                                 return -EFAULT;
1687                         }
1688                 } else {
1689                         memset(buf, 0, size);
1690                 }
1691         }
1692
1693         if (!connected(ps)) {
1694                 kfree(buf);
1695                 return -ENODEV;
1696         }
1697
1698         if (ps->dev->state != USB_STATE_CONFIGURED)
1699                 retval = -EHOSTUNREACH;
1700         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1701                 retval = -EINVAL;
1702         else switch (ctl->ioctl_code) {
1703
1704         /* disconnect kernel driver from interface */
1705         case USBDEVFS_DISCONNECT:
1706                 if (intf->dev.driver) {
1707                         driver = to_usb_driver(intf->dev.driver);
1708                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1709                         usb_driver_release_interface(driver, intf);
1710                 } else
1711                         retval = -ENODATA;
1712                 break;
1713
1714         /* let kernel drivers try to (re)bind to the interface */
1715         case USBDEVFS_CONNECT:
1716                 if (!intf->dev.driver)
1717                         retval = device_attach(&intf->dev);
1718                 else
1719                         retval = -EBUSY;
1720                 break;
1721
1722         /* talk directly to the interface's driver */
1723         default:
1724                 if (intf->dev.driver)
1725                         driver = to_usb_driver(intf->dev.driver);
1726                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1727                         retval = -ENOTTY;
1728                 } else {
1729                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1730                         if (retval == -ENOIOCTLCMD)
1731                                 retval = -ENOTTY;
1732                 }
1733         }
1734
1735         /* cleanup and return */
1736         if (retval >= 0
1737                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1738                         && size > 0
1739                         && copy_to_user(ctl->data, buf, size) != 0)
1740                 retval = -EFAULT;
1741
1742         kfree(buf);
1743         return retval;
1744 }
1745
1746 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1747 {
1748         struct usbdevfs_ioctl   ctrl;
1749
1750         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1751                 return -EFAULT;
1752         return proc_ioctl(ps, &ctrl);
1753 }
1754
1755 #ifdef CONFIG_COMPAT
1756 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1757 {
1758         struct usbdevfs_ioctl32 __user *uioc;
1759         struct usbdevfs_ioctl ctrl;
1760         u32 udata;
1761
1762         uioc = compat_ptr((long)arg);
1763         if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1764             __get_user(ctrl.ifno, &uioc->ifno) ||
1765             __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1766             __get_user(udata, &uioc->data))
1767                 return -EFAULT;
1768         ctrl.data = compat_ptr(udata);
1769
1770         return proc_ioctl(ps, &ctrl);
1771 }
1772 #endif
1773
1774 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1775 {
1776         unsigned portnum;
1777         int rc;
1778
1779         if (get_user(portnum, (unsigned __user *) arg))
1780                 return -EFAULT;
1781         rc = usb_hub_claim_port(ps->dev, portnum, ps);
1782         if (rc == 0)
1783                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1784                         portnum, task_pid_nr(current), current->comm);
1785         return rc;
1786 }
1787
1788 static int proc_release_port(struct dev_state *ps, void __user *arg)
1789 {
1790         unsigned portnum;
1791
1792         if (get_user(portnum, (unsigned __user *) arg))
1793                 return -EFAULT;
1794         return usb_hub_release_port(ps->dev, portnum, ps);
1795 }
1796
1797 /*
1798  * NOTE:  All requests here that have interface numbers as parameters
1799  * are assuming that somehow the configuration has been prevented from
1800  * changing.  But there's no mechanism to ensure that...
1801  */
1802 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1803                                 void __user *p)
1804 {
1805         struct dev_state *ps = file->private_data;
1806         struct inode *inode = file->f_path.dentry->d_inode;
1807         struct usb_device *dev = ps->dev;
1808         int ret = -ENOTTY;
1809
1810         if (!(file->f_mode & FMODE_WRITE))
1811                 return -EPERM;
1812
1813         usb_lock_device(dev);
1814         if (!connected(ps)) {
1815                 usb_unlock_device(dev);
1816                 return -ENODEV;
1817         }
1818
1819         switch (cmd) {
1820         case USBDEVFS_CONTROL:
1821                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1822                 ret = proc_control(ps, p);
1823                 if (ret >= 0)
1824                         inode->i_mtime = CURRENT_TIME;
1825                 break;
1826
1827         case USBDEVFS_BULK:
1828                 snoop(&dev->dev, "%s: BULK\n", __func__);
1829                 ret = proc_bulk(ps, p);
1830                 if (ret >= 0)
1831                         inode->i_mtime = CURRENT_TIME;
1832                 break;
1833
1834         case USBDEVFS_RESETEP:
1835                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1836                 ret = proc_resetep(ps, p);
1837                 if (ret >= 0)
1838                         inode->i_mtime = CURRENT_TIME;
1839                 break;
1840
1841         case USBDEVFS_RESET:
1842                 snoop(&dev->dev, "%s: RESET\n", __func__);
1843                 ret = proc_resetdevice(ps);
1844                 break;
1845
1846         case USBDEVFS_CLEAR_HALT:
1847                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1848                 ret = proc_clearhalt(ps, p);
1849                 if (ret >= 0)
1850                         inode->i_mtime = CURRENT_TIME;
1851                 break;
1852
1853         case USBDEVFS_GETDRIVER:
1854                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1855                 ret = proc_getdriver(ps, p);
1856                 break;
1857
1858         case USBDEVFS_CONNECTINFO:
1859                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1860                 ret = proc_connectinfo(ps, p);
1861                 break;
1862
1863         case USBDEVFS_SETINTERFACE:
1864                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1865                 ret = proc_setintf(ps, p);
1866                 break;
1867
1868         case USBDEVFS_SETCONFIGURATION:
1869                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1870                 ret = proc_setconfig(ps, p);
1871                 break;
1872
1873         case USBDEVFS_SUBMITURB:
1874                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1875                 ret = proc_submiturb(ps, p);
1876                 if (ret >= 0)
1877                         inode->i_mtime = CURRENT_TIME;
1878                 break;
1879
1880 #ifdef CONFIG_COMPAT
1881         case USBDEVFS_CONTROL32:
1882                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
1883                 ret = proc_control_compat(ps, p);
1884                 if (ret >= 0)
1885                         inode->i_mtime = CURRENT_TIME;
1886                 break;
1887
1888         case USBDEVFS_BULK32:
1889                 snoop(&dev->dev, "%s: BULK32\n", __func__);
1890                 ret = proc_bulk_compat(ps, p);
1891                 if (ret >= 0)
1892                         inode->i_mtime = CURRENT_TIME;
1893                 break;
1894
1895         case USBDEVFS_DISCSIGNAL32:
1896                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
1897                 ret = proc_disconnectsignal_compat(ps, p);
1898                 break;
1899
1900         case USBDEVFS_SUBMITURB32:
1901                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1902                 ret = proc_submiturb_compat(ps, p);
1903                 if (ret >= 0)
1904                         inode->i_mtime = CURRENT_TIME;
1905                 break;
1906
1907         case USBDEVFS_REAPURB32:
1908                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1909                 ret = proc_reapurb_compat(ps, p);
1910                 break;
1911
1912         case USBDEVFS_REAPURBNDELAY32:
1913                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
1914                 ret = proc_reapurbnonblock_compat(ps, p);
1915                 break;
1916
1917         case USBDEVFS_IOCTL32:
1918                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
1919                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1920                 break;
1921 #endif
1922
1923         case USBDEVFS_DISCARDURB:
1924                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1925                 ret = proc_unlinkurb(ps, p);
1926                 break;
1927
1928         case USBDEVFS_REAPURB:
1929                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1930                 ret = proc_reapurb(ps, p);
1931                 break;
1932
1933         case USBDEVFS_REAPURBNDELAY:
1934                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
1935                 ret = proc_reapurbnonblock(ps, p);
1936                 break;
1937
1938         case USBDEVFS_DISCSIGNAL:
1939                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1940                 ret = proc_disconnectsignal(ps, p);
1941                 break;
1942
1943         case USBDEVFS_CLAIMINTERFACE:
1944                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1945                 ret = proc_claiminterface(ps, p);
1946                 break;
1947
1948         case USBDEVFS_RELEASEINTERFACE:
1949                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1950                 ret = proc_releaseinterface(ps, p);
1951                 break;
1952
1953         case USBDEVFS_IOCTL:
1954                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1955                 ret = proc_ioctl_default(ps, p);
1956                 break;
1957
1958         case USBDEVFS_CLAIM_PORT:
1959                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
1960                 ret = proc_claim_port(ps, p);
1961                 break;
1962
1963         case USBDEVFS_RELEASE_PORT:
1964                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
1965                 ret = proc_release_port(ps, p);
1966                 break;
1967         }
1968         usb_unlock_device(dev);
1969         if (ret >= 0)
1970                 inode->i_atime = CURRENT_TIME;
1971         return ret;
1972 }
1973
1974 static long usbdev_ioctl(struct file *file, unsigned int cmd,
1975                         unsigned long arg)
1976 {
1977         int ret;
1978
1979         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
1980
1981         return ret;
1982 }
1983
1984 #ifdef CONFIG_COMPAT
1985 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
1986                         unsigned long arg)
1987 {
1988         int ret;
1989
1990         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
1991
1992         return ret;
1993 }
1994 #endif
1995
1996 /* No kernel lock - fine */
1997 static unsigned int usbdev_poll(struct file *file,
1998                                 struct poll_table_struct *wait)
1999 {
2000         struct dev_state *ps = file->private_data;
2001         unsigned int mask = 0;
2002
2003         poll_wait(file, &ps->wait, wait);
2004         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2005                 mask |= POLLOUT | POLLWRNORM;
2006         if (!connected(ps))
2007                 mask |= POLLERR | POLLHUP;
2008         return mask;
2009 }
2010
2011 const struct file_operations usbdev_file_operations = {
2012         .owner =          THIS_MODULE,
2013         .llseek =         usbdev_lseek,
2014         .read =           usbdev_read,
2015         .poll =           usbdev_poll,
2016         .unlocked_ioctl = usbdev_ioctl,
2017 #ifdef CONFIG_COMPAT
2018         .compat_ioctl =   usbdev_compat_ioctl,
2019 #endif
2020         .open =           usbdev_open,
2021         .release =        usbdev_release,
2022 };
2023
2024 static void usbdev_remove(struct usb_device *udev)
2025 {
2026         struct dev_state *ps;
2027         struct siginfo sinfo;
2028
2029         while (!list_empty(&udev->filelist)) {
2030                 ps = list_entry(udev->filelist.next, struct dev_state, list);
2031                 destroy_all_async(ps);
2032                 wake_up_all(&ps->wait);
2033                 list_del_init(&ps->list);
2034                 if (ps->discsignr) {
2035                         memset(&sinfo, 0, sizeof(sinfo));
2036                         sinfo.si_signo = ps->discsignr;
2037                         sinfo.si_errno = EPIPE;
2038                         sinfo.si_code = SI_ASYNCIO;
2039                         sinfo.si_addr = ps->disccontext;
2040                         kill_pid_info_as_cred(ps->discsignr, &sinfo,
2041                                         ps->disc_pid, ps->cred, ps->secid);
2042                 }
2043         }
2044 }
2045
2046 #ifdef CONFIG_USB_DEVICE_CLASS
2047 static struct class *usb_classdev_class;
2048
2049 static int usb_classdev_add(struct usb_device *dev)
2050 {
2051         struct device *cldev;
2052
2053         cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
2054                               NULL, "usbdev%d.%d", dev->bus->busnum,
2055                               dev->devnum);
2056         if (IS_ERR(cldev))
2057                 return PTR_ERR(cldev);
2058         dev->usb_classdev = cldev;
2059         return 0;
2060 }
2061
2062 static void usb_classdev_remove(struct usb_device *dev)
2063 {
2064         if (dev->usb_classdev)
2065                 device_unregister(dev->usb_classdev);
2066 }
2067
2068 #else
2069 #define usb_classdev_add(dev)           0
2070 #define usb_classdev_remove(dev)        do {} while (0)
2071
2072 #endif
2073
2074 static int usbdev_notify(struct notifier_block *self,
2075                                unsigned long action, void *dev)
2076 {
2077         switch (action) {
2078         case USB_DEVICE_ADD:
2079                 if (usb_classdev_add(dev))
2080                         return NOTIFY_BAD;
2081                 break;
2082         case USB_DEVICE_REMOVE:
2083                 usb_classdev_remove(dev);
2084                 usbdev_remove(dev);
2085                 break;
2086         }
2087         return NOTIFY_OK;
2088 }
2089
2090 static struct notifier_block usbdev_nb = {
2091         .notifier_call =        usbdev_notify,
2092 };
2093
2094 static struct cdev usb_device_cdev;
2095
2096 int __init usb_devio_init(void)
2097 {
2098         int retval;
2099
2100         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2101                                         "usb_device");
2102         if (retval) {
2103                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2104                 goto out;
2105         }
2106         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2107         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2108         if (retval) {
2109                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2110                        USB_DEVICE_MAJOR);
2111                 goto error_cdev;
2112         }
2113 #ifdef CONFIG_USB_DEVICE_CLASS
2114         usb_classdev_class = class_create(THIS_MODULE, "usb_device");
2115         if (IS_ERR(usb_classdev_class)) {
2116                 printk(KERN_ERR "Unable to register usb_device class\n");
2117                 retval = PTR_ERR(usb_classdev_class);
2118                 cdev_del(&usb_device_cdev);
2119                 usb_classdev_class = NULL;
2120                 goto out;
2121         }
2122         /* devices of this class shadow the major:minor of their parent
2123          * device, so clear ->dev_kobj to prevent adding duplicate entries
2124          * to /sys/dev
2125          */
2126         usb_classdev_class->dev_kobj = NULL;
2127 #endif
2128         usb_register_notify(&usbdev_nb);
2129 out:
2130         return retval;
2131
2132 error_cdev:
2133         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2134         goto out;
2135 }
2136
2137 void usb_devio_cleanup(void)
2138 {
2139         usb_unregister_notify(&usbdev_nb);
2140 #ifdef CONFIG_USB_DEVICE_CLASS
2141         class_destroy(usb_classdev_class);
2142 #endif
2143         cdev_del(&usb_device_cdev);
2144         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2145 }