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