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 <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 = get_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                 put_pid(pid);
 429         }
 430
 431         wake_up(&ps->wait);
 432 }
 433
 434 static void destroy_async(struct dev_state *ps, struct list_head *list)
 435 {
 436         struct async *as;
 437         unsigned long flags;
 438
 439         spin_lock_irqsave(&ps->lock, flags);
 440         while (!list_empty(list)) {
 441                 as = list_entry(list->next, struct async, asynclist);
 442                 list_del_init(&as->asynclist);
 443
 444                 /* drop the spinlock so the completion handler can run */
 445                 spin_unlock_irqrestore(&ps->lock, flags);
 446                 usb_kill_urb(as->urb);
 447                 spin_lock_irqsave(&ps->lock, flags);
 448         }
 449         spin_unlock_irqrestore(&ps->lock, flags);
 450 }
 451
 452 static void destroy_async_on_interface(struct dev_state *ps,
 453                                        unsigned int ifnum)
 454 {
 455         struct list_head *p, *q, hitlist;
 456         unsigned long flags;
 457
 458         INIT_LIST_HEAD(&hitlist);
 459         spin_lock_irqsave(&ps->lock, flags);
 460         list_for_each_safe(p, q, &ps->async_pending)
 461                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 462                         list_move_tail(p, &hitlist);
 463         spin_unlock_irqrestore(&ps->lock, flags);
 464         destroy_async(ps, &hitlist);
 465 }
 466
 467 static void destroy_all_async(struct dev_state *ps)
 468 {
 469         destroy_async(ps, &ps->async_pending);
 470 }
 471
 472 /*
 473  * interface claims are made only at the request of user level code,
 474  * which can also release them (explicitly or by closing files).
 475  * they're also undone when devices disconnect.
 476  */
 477
 478 static int driver_probe(struct usb_interface *intf,
 479                         const struct usb_device_id *id)
 480 {
 481         return -ENODEV;
 482 }
 483
 484 static void driver_disconnect(struct usb_interface *intf)
 485 {
 486         struct dev_state *ps = usb_get_intfdata(intf);
 487         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 488
 489         if (!ps)
 490                 return;
 491
 492         /* NOTE:  this relies on usbcore having canceled and completed
 493          * all pending I/O requests; 2.6 does that.
 494          */
 495
 496         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 497                 clear_bit(ifnum, &ps->ifclaimed);
 498         else
 499                 dev_warn(&intf->dev, "interface number %u out of range\n",
 500                          ifnum);
 501
 502         usb_set_intfdata(intf, NULL);
 503
 504         /* force async requests to complete */
 505         destroy_async_on_interface(ps, ifnum);
 506 }
 507
 508 /* The following routines are merely placeholders.  There is no way
 509  * to inform a user task about suspend or resumes.
 510  */
 511 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 512 {
 513         return 0;
 514 }
 515
 516 static int driver_resume(struct usb_interface *intf)
 517 {
 518         return 0;
 519 }
 520
 521 struct usb_driver usbfs_driver = {
 522         .name =         "usbfs",
 523         .probe =        driver_probe,
 524         .disconnect =   driver_disconnect,
 525         .suspend =      driver_suspend,
 526         .resume =       driver_resume,
 527 };
 528
 529 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 530 {
 531         struct usb_device *dev = ps->dev;
 532         struct usb_interface *intf;
 533         int err;
 534
 535         if (ifnum >= 8*sizeof(ps->ifclaimed))
 536                 return -EINVAL;
 537         /* already claimed */
 538         if (test_bit(ifnum, &ps->ifclaimed))
 539                 return 0;
 540
 541         intf = usb_ifnum_to_if(dev, ifnum);
 542         if (!intf)
 543                 err = -ENOENT;
 544         else
 545                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 546         if (err == 0)
 547                 set_bit(ifnum, &ps->ifclaimed);
 548         return err;
 549 }
 550
 551 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 552 {
 553         struct usb_device *dev;
 554         struct usb_interface *intf;
 555         int err;
 556
 557         err = -EINVAL;
 558         if (ifnum >= 8*sizeof(ps->ifclaimed))
 559                 return err;
 560         dev = ps->dev;
 561         intf = usb_ifnum_to_if(dev, ifnum);
 562         if (!intf)
 563                 err = -ENOENT;
 564         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 565                 usb_driver_release_interface(&usbfs_driver, intf);
 566                 err = 0;
 567         }
 568         return err;
 569 }
 570
 571 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 572 {
 573         if (ps->dev->state != USB_STATE_CONFIGURED)
 574                 return -EHOSTUNREACH;
 575         if (ifnum >= 8*sizeof(ps->ifclaimed))
 576                 return -EINVAL;
 577         if (test_bit(ifnum, &ps->ifclaimed))
 578                 return 0;
 579         /* if not yet claimed, claim it for the driver */
 580         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 581                  "interface %u before use\n", task_pid_nr(current),
 582                  current->comm, ifnum);
 583         return claimintf(ps, ifnum);
 584 }
 585
 586 static int findintfep(struct usb_device *dev, unsigned int ep)
 587 {
 588         unsigned int i, j, e;
 589         struct usb_interface *intf;
 590         struct usb_host_interface *alts;
 591         struct usb_endpoint_descriptor *endpt;
 592
 593         if (ep & ~(USB_DIR_IN|0xf))
 594                 return -EINVAL;
 595         if (!dev->actconfig)
 596                 return -ESRCH;
 597         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 598                 intf = dev->actconfig->interface[i];
 599                 for (j = 0; j < intf->num_altsetting; j++) {
 600                         alts = &intf->altsetting[j];
 601                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 602                                 endpt = &alts->endpoint[e].desc;
 603                                 if (endpt->bEndpointAddress == ep)
 604                                         return alts->desc.bInterfaceNumber;
 605                         }
 606                 }
 607         }
 608         return -ENOENT;
 609 }
 610
 611 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
 612                            unsigned int index)
 613 {
 614         int ret = 0;
 615
 616         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 617          && ps->dev->state != USB_STATE_ADDRESS
 618          && ps->dev->state != USB_STATE_CONFIGURED)
 619                 return -EHOSTUNREACH;
 620         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 621                 return 0;
 622
 623         index &= 0xff;
 624         switch (requesttype & USB_RECIP_MASK) {
 625         case USB_RECIP_ENDPOINT:
 626                 ret = findintfep(ps->dev, index);
 627                 if (ret >= 0)
 628                         ret = checkintf(ps, ret);
 629                 break;
 630
 631         case USB_RECIP_INTERFACE:
 632                 ret = checkintf(ps, index);
 633                 break;
 634         }
 635         return ret;
 636 }
 637
 638 static int match_devt(struct device *dev, void *data)
 639 {
 640         return dev->devt == (dev_t) (unsigned long) data;
 641 }
 642
 643 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 644 {
 645         struct device *dev;
 646
 647         dev = bus_find_device(&usb_bus_type, NULL,
 648                               (void *) (unsigned long) devt, match_devt);
 649         if (!dev)
 650                 return NULL;
 651         return container_of(dev, struct usb_device, dev);
 652 }
 653
 654 /*
 655  * file operations
 656  */
 657 static int usbdev_open(struct inode *inode, struct file *file)
 658 {
 659         struct usb_device *dev = NULL;
 660         struct dev_state *ps;
 661         const struct cred *cred = current_cred();
 662         int ret;
 663
 664         ret = -ENOMEM;
 665         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
 666         if (!ps)
 667                 goto out_free_ps;
 668
 669         ret = -ENODEV;
 670
 671         /* Protect against simultaneous removal or release */
 672         mutex_lock(&usbfs_mutex);
 673
 674         /* usbdev device-node */
 675         if (imajor(inode) == USB_DEVICE_MAJOR)
 676                 dev = usbdev_lookup_by_devt(inode->i_rdev);
 677
 678 #ifdef CONFIG_USB_DEVICEFS
 679         /* procfs file */
 680         if (!dev) {
 681                 dev = inode->i_private;
 682                 if (dev && dev->usbfs_dentry &&
 683                                         dev->usbfs_dentry->d_inode == inode)
 684                         usb_get_dev(dev);
 685                 else
 686                         dev = NULL;
 687         }
 688 #endif
 689         mutex_unlock(&usbfs_mutex);
 690
 691         if (!dev)
 692                 goto out_free_ps;
 693
 694         usb_lock_device(dev);
 695         if (dev->state == USB_STATE_NOTATTACHED)
 696                 goto out_unlock_device;
 697
 698         ret = usb_autoresume_device(dev);
 699         if (ret)
 700                 goto out_unlock_device;
 701
 702         ps->dev = dev;
 703         ps->file = file;
 704         spin_lock_init(&ps->lock);
 705         INIT_LIST_HEAD(&ps->list);
 706         INIT_LIST_HEAD(&ps->async_pending);
 707         INIT_LIST_HEAD(&ps->async_completed);
 708         init_waitqueue_head(&ps->wait);
 709         ps->discsignr = 0;
 710         ps->disc_pid = get_pid(task_pid(current));
 711         ps->disc_uid = cred->uid;
 712         ps->disc_euid = cred->euid;
 713         ps->disccontext = NULL;
 714         ps->ifclaimed = 0;
 715         security_task_getsecid(current, &ps->secid);
 716         smp_wmb();
 717         list_add_tail(&ps->list, &dev->filelist);
 718         file->private_data = ps;
 719         usb_unlock_device(dev);
 720         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
 721                         current->comm);
 722         return ret;
 723
 724  out_unlock_device:
 725         usb_unlock_device(dev);
 726         usb_put_dev(dev);
 727  out_free_ps:
 728         kfree(ps);
 729         return ret;
 730 }
 731
 732 static int usbdev_release(struct inode *inode, struct file *file)
 733 {
 734         struct dev_state *ps = file->private_data;
 735         struct usb_device *dev = ps->dev;
 736         unsigned int ifnum;
 737         struct async *as;
 738
 739         usb_lock_device(dev);
 740         usb_hub_release_all_ports(dev, ps);
 741
 742         list_del_init(&ps->list);
 743
 744         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 745                         ifnum++) {
 746                 if (test_bit(ifnum, &ps->ifclaimed))
 747                         releaseintf(ps, ifnum);
 748         }
 749         destroy_all_async(ps);
 750         usb_autosuspend_device(dev);
 751         usb_unlock_device(dev);
 752         usb_put_dev(dev);
 753         put_pid(ps->disc_pid);
 754
 755         as = async_getcompleted(ps);
 756         while (as) {
 757                 free_async(as);
 758                 as = async_getcompleted(ps);
 759         }
 760         kfree(ps);
 761         return 0;
 762 }
 763
 764 static int proc_control(struct dev_state *ps, void __user *arg)
 765 {
 766         struct usb_device *dev = ps->dev;
 767         struct usbdevfs_ctrltransfer ctrl;
 768         unsigned int tmo;
 769         unsigned char *tbuf;
 770         unsigned wLength;
 771         int i, pipe, ret;
 772
 773         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 774                 return -EFAULT;
 775         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
 776         if (ret)
 777                 return ret;
 778         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
 779         if (wLength > PAGE_SIZE)
 780                 return -EINVAL;
 781         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
 782         if (!tbuf)
 783                 return -ENOMEM;
 784         tmo = ctrl.timeout;
 785         snoop(&dev->dev, "control urb: bRequestType=%02x "
 786                 "bRequest=%02x wValue=%04x "
 787                 "wIndex=%04x wLength=%04x\n",
 788                 ctrl.bRequestType, ctrl.bRequest,
 789                 __le16_to_cpup(&ctrl.wValue),
 790                 __le16_to_cpup(&ctrl.wIndex),
 791                 __le16_to_cpup(&ctrl.wLength));
 792         if (ctrl.bRequestType & 0x80) {
 793                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
 794                                                ctrl.wLength)) {
 795                         free_page((unsigned long)tbuf);
 796                         return -EINVAL;
 797                 }
 798                 pipe = usb_rcvctrlpipe(dev, 0);
 799                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
 800
 801                 usb_unlock_device(dev);
 802                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
 803                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 804                                     tbuf, ctrl.wLength, tmo);
 805                 usb_lock_device(dev);
 806                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
 807                           tbuf, max(i, 0));
 808                 if ((i > 0) && ctrl.wLength) {
 809                         if (copy_to_user(ctrl.data, tbuf, i)) {
 810                                 free_page((unsigned long)tbuf);
 811                                 return -EFAULT;
 812                         }
 813                 }
 814         } else {
 815                 if (ctrl.wLength) {
 816                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 817                                 free_page((unsigned long)tbuf);
 818                                 return -EFAULT;
 819                         }
 820                 }
 821                 pipe = usb_sndctrlpipe(dev, 0);
 822                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
 823                         tbuf, ctrl.wLength);
 824
 825                 usb_unlock_device(dev);
 826                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
 827                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 828                                     tbuf, ctrl.wLength, tmo);
 829                 usb_lock_device(dev);
 830                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
 831         }
 832         free_page((unsigned long)tbuf);
 833         if (i < 0 && i != -EPIPE) {
 834                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 835                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 836                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 837                            ctrl.wLength, i);
 838         }
 839         return i;
 840 }
 841
 842 static int proc_bulk(struct dev_state *ps, void __user *arg)
 843 {
 844         struct usb_device *dev = ps->dev;
 845         struct usbdevfs_bulktransfer bulk;
 846         unsigned int tmo, len1, pipe;
 847         int len2;
 848         unsigned char *tbuf;
 849         int i, ret;
 850
 851         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 852                 return -EFAULT;
 853         ret = findintfep(ps->dev, bulk.ep);
 854         if (ret < 0)
 855                 return ret;
 856         ret = checkintf(ps, ret);
 857         if (ret)
 858                 return ret;
 859         if (bulk.ep & USB_DIR_IN)
 860                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 861         else
 862                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 863         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 864                 return -EINVAL;
 865         len1 = bulk.len;
 866         if (len1 > MAX_USBFS_BUFFER_SIZE)
 867                 return -EINVAL;
 868         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 869                 return -ENOMEM;
 870         tmo = bulk.timeout;
 871         if (bulk.ep & 0x80) {
 872                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 873                         kfree(tbuf);
 874                         return -EINVAL;
 875                 }
 876                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
 877
 878                 usb_unlock_device(dev);
 879                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 880                 usb_lock_device(dev);
 881                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
 882
 883                 if (!i && len2) {
 884                         if (copy_to_user(bulk.data, tbuf, len2)) {
 885                                 kfree(tbuf);
 886                                 return -EFAULT;
 887                         }
 888                 }
 889         } else {
 890                 if (len1) {
 891                         if (copy_from_user(tbuf, bulk.data, len1)) {
 892                                 kfree(tbuf);
 893                                 return -EFAULT;
 894                         }
 895                 }
 896                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
 897
 898                 usb_unlock_device(dev);
 899                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 900                 usb_lock_device(dev);
 901                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
 902         }
 903         kfree(tbuf);
 904         if (i < 0)
 905                 return i;
 906         return len2;
 907 }
 908
 909 static int proc_resetep(struct dev_state *ps, void __user *arg)
 910 {
 911         unsigned int ep;
 912         int ret;
 913
 914         if (get_user(ep, (unsigned int __user *)arg))
 915                 return -EFAULT;
 916         ret = findintfep(ps->dev, ep);
 917         if (ret < 0)
 918                 return ret;
 919         ret = checkintf(ps, ret);
 920         if (ret)
 921                 return ret;
 922         usb_reset_endpoint(ps->dev, ep);
 923         return 0;
 924 }
 925
 926 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 927 {
 928         unsigned int ep;
 929         int pipe;
 930         int ret;
 931
 932         if (get_user(ep, (unsigned int __user *)arg))
 933                 return -EFAULT;
 934         ret = findintfep(ps->dev, ep);
 935         if (ret < 0)
 936                 return ret;
 937         ret = checkintf(ps, ret);
 938         if (ret)
 939                 return ret;
 940         if (ep & USB_DIR_IN)
 941                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 942         else
 943                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 944
 945         return usb_clear_halt(ps->dev, pipe);
 946 }
 947
 948 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 949 {
 950         struct usbdevfs_getdriver gd;
 951         struct usb_interface *intf;
 952         int ret;
 953
 954         if (copy_from_user(&gd, arg, sizeof(gd)))
 955                 return -EFAULT;
 956         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 957         if (!intf || !intf->dev.driver)
 958                 ret = -ENODATA;
 959         else {
 960                 strncpy(gd.driver, intf->dev.driver->name,
 961                                 sizeof(gd.driver));
 962                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 963         }
 964         return ret;
 965 }
 966
 967 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 968 {
 969         struct usbdevfs_connectinfo ci = {
 970                 .devnum = ps->dev->devnum,
 971                 .slow = ps->dev->speed == USB_SPEED_LOW
 972         };
 973
 974         if (copy_to_user(arg, &ci, sizeof(ci)))
 975                 return -EFAULT;
 976         return 0;
 977 }
 978
 979 static int proc_resetdevice(struct dev_state *ps)
 980 {
 981         return usb_reset_device(ps->dev);
 982 }
 983
 984 static int proc_setintf(struct dev_state *ps, void __user *arg)
 985 {
 986         struct usbdevfs_setinterface setintf;
 987         int ret;
 988
 989         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 990                 return -EFAULT;
 991         if ((ret = checkintf(ps, setintf.interface)))
 992                 return ret;
 993         return usb_set_interface(ps->dev, setintf.interface,
 994                         setintf.altsetting);
 995 }
 996
 997 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 998 {
 999         int u;
1000         int status = 0;
1001         struct usb_host_config *actconfig;
1002
1003         if (get_user(u, (int __user *)arg))
1004                 return -EFAULT;
1005
1006         actconfig = ps->dev->actconfig;
1007
1008         /* Don't touch the device if any interfaces are claimed.
1009          * It could interfere with other drivers' operations, and if
1010          * an interface is claimed by usbfs it could easily deadlock.
1011          */
1012         if (actconfig) {
1013                 int i;
1014
1015                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1016                         if (usb_interface_claimed(actconfig->interface[i])) {
1017                                 dev_warn(&ps->dev->dev,
1018                                         "usbfs: interface %d claimed by %s "
1019                                         "while '%s' sets config #%d\n",
1020                                         actconfig->interface[i]
1021                                                 ->cur_altsetting
1022                                                 ->desc.bInterfaceNumber,
1023                                         actconfig->interface[i]
1024                                                 ->dev.driver->name,
1025                                         current->comm, u);
1026                                 status = -EBUSY;
1027                                 break;
1028                         }
1029                 }
1030         }
1031
1032         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1033          * so avoid usb_set_configuration()'s kick to sysfs
1034          */
1035         if (status == 0) {
1036                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1037                         status = usb_reset_configuration(ps->dev);
1038                 else
1039                         status = usb_set_configuration(ps->dev, u);
1040         }
1041
1042         return status;
1043 }
1044
1045 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1046                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1047                         void __user *arg)
1048 {
1049         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1050         struct usb_host_endpoint *ep;
1051         struct async *as;
1052         struct usb_ctrlrequest *dr = NULL;
1053         const struct cred *cred = current_cred();
1054         unsigned int u, totlen, isofrmlen;
1055         int ret, ifnum = -1;
1056         int is_in;
1057
1058         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1059                                 USBDEVFS_URB_SHORT_NOT_OK |
1060                                 USBDEVFS_URB_BULK_CONTINUATION |
1061                                 USBDEVFS_URB_NO_FSBR |
1062                                 USBDEVFS_URB_ZERO_PACKET |
1063                                 USBDEVFS_URB_NO_INTERRUPT))
1064                 return -EINVAL;
1065         if (uurb->buffer_length > 0 && !uurb->buffer)
1066                 return -EINVAL;
1067         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1068             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1069                 ifnum = findintfep(ps->dev, uurb->endpoint);
1070                 if (ifnum < 0)
1071                         return ifnum;
1072                 ret = checkintf(ps, ifnum);
1073                 if (ret)
1074                         return ret;
1075         }
1076         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1077                 is_in = 1;
1078                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1079         } else {
1080                 is_in = 0;
1081                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1082         }
1083         if (!ep)
1084                 return -ENOENT;
1085         switch(uurb->type) {
1086         case USBDEVFS_URB_TYPE_CONTROL:
1087                 if (!usb_endpoint_xfer_control(&ep->desc))
1088                         return -EINVAL;
1089                 /* min 8 byte setup packet,
1090                  * max 8 byte setup plus an arbitrary data stage */
1091                 if (uurb->buffer_length < 8 ||
1092                     uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1093                         return -EINVAL;
1094                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1095                 if (!dr)
1096                         return -ENOMEM;
1097                 if (copy_from_user(dr, uurb->buffer, 8)) {
1098                         kfree(dr);
1099                         return -EFAULT;
1100                 }
1101                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1102                         kfree(dr);
1103                         return -EINVAL;
1104                 }
1105                 ret = check_ctrlrecip(ps, dr->bRequestType,
1106                                       le16_to_cpup(&dr->wIndex));
1107                 if (ret) {
1108                         kfree(dr);
1109                         return ret;
1110                 }
1111                 uurb->number_of_packets = 0;
1112                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1113                 uurb->buffer += 8;
1114                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1115                         is_in = 1;
1116                         uurb->endpoint |= USB_DIR_IN;
1117                 } else {
1118                         is_in = 0;
1119                         uurb->endpoint &= ~USB_DIR_IN;
1120                 }
1121                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1122                         "bRequest=%02x wValue=%04x "
1123                         "wIndex=%04x wLength=%04x\n",
1124                         dr->bRequestType, dr->bRequest,
1125                         __le16_to_cpup(&dr->wValue),
1126                         __le16_to_cpup(&dr->wIndex),
1127                         __le16_to_cpup(&dr->wLength));
1128                 break;
1129
1130         case USBDEVFS_URB_TYPE_BULK:
1131                 switch (usb_endpoint_type(&ep->desc)) {
1132                 case USB_ENDPOINT_XFER_CONTROL:
1133                 case USB_ENDPOINT_XFER_ISOC:
1134                         return -EINVAL;
1135                 case USB_ENDPOINT_XFER_INT:
1136                         /* allow single-shot interrupt transfers */
1137                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1138                         goto interrupt_urb;
1139                 }
1140                 uurb->number_of_packets = 0;
1141                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1142                         return -EINVAL;
1143                 break;
1144
1145         case USBDEVFS_URB_TYPE_INTERRUPT:
1146                 if (!usb_endpoint_xfer_int(&ep->desc))
1147                         return -EINVAL;
1148  interrupt_urb:
1149                 uurb->number_of_packets = 0;
1150                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1151                         return -EINVAL;
1152                 break;
1153
1154         case USBDEVFS_URB_TYPE_ISO:
1155                 /* arbitrary limit */
1156                 if (uurb->number_of_packets < 1 ||
1157                     uurb->number_of_packets > 128)
1158                         return -EINVAL;
1159                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1160                         return -EINVAL;
1161                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1162                                    uurb->number_of_packets;
1163                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1164                         return -ENOMEM;
1165                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1166                         kfree(isopkt);
1167                         return -EFAULT;
1168                 }
1169                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1170                         /* arbitrary limit,
1171                          * sufficient for USB 2.0 high-bandwidth iso */
1172                         if (isopkt[u].length > 8192) {
1173                                 kfree(isopkt);
1174                                 return -EINVAL;
1175                         }
1176                         totlen += isopkt[u].length;
1177                 }
1178                 /* 3072 * 64 microframes */
1179                 if (totlen > 196608) {
1180                         kfree(isopkt);
1181                         return -EINVAL;
1182                 }
1183                 uurb->buffer_length = totlen;
1184                 break;
1185
1186         default:
1187                 return -EINVAL;
1188         }
1189         if (uurb->buffer_length > 0 &&
1190                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1191                                 uurb->buffer, uurb->buffer_length)) {
1192                 kfree(isopkt);
1193                 kfree(dr);
1194                 return -EFAULT;
1195         }
1196         as = alloc_async(uurb->number_of_packets);
1197         if (!as) {
1198                 kfree(isopkt);
1199                 kfree(dr);
1200                 return -ENOMEM;
1201         }
1202         if (uurb->buffer_length > 0) {
1203                 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1204                                 GFP_KERNEL);
1205                 if (!as->urb->transfer_buffer) {
1206                         kfree(isopkt);
1207                         kfree(dr);
1208                         free_async(as);
1209                         return -ENOMEM;
1210                 }
1211                 /* Isochronous input data may end up being discontiguous
1212                  * if some of the packets are short.  Clear the buffer so
1213                  * that the gaps don't leak kernel data to userspace.
1214                  */
1215                 if (is_in && uurb->type == USBDEVFS_URB_TYPE_ISO)
1216                         memset(as->urb->transfer_buffer, 0,
1217                                         uurb->buffer_length);
1218         }
1219         as->urb->dev = ps->dev;
1220         as->urb->pipe = (uurb->type << 30) |
1221                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1222                         (uurb->endpoint & USB_DIR_IN);
1223
1224         /* This tedious sequence is necessary because the URB_* flags
1225          * are internal to the kernel and subject to change, whereas
1226          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1227          */
1228         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1229         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1230                 u |= URB_ISO_ASAP;
1231         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1232                 u |= URB_SHORT_NOT_OK;
1233         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1234                 u |= URB_NO_FSBR;
1235         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1236                 u |= URB_ZERO_PACKET;
1237         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1238                 u |= URB_NO_INTERRUPT;
1239         as->urb->transfer_flags = u;
1240
1241         as->urb->transfer_buffer_length = uurb->buffer_length;
1242         as->urb->setup_packet = (unsigned char *)dr;
1243         as->urb->start_frame = uurb->start_frame;
1244         as->urb->number_of_packets = uurb->number_of_packets;
1245         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1246                         ps->dev->speed == USB_SPEED_HIGH)
1247                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1248         else
1249                 as->urb->interval = ep->desc.bInterval;
1250         as->urb->context = as;
1251         as->urb->complete = async_completed;
1252         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1253                 as->urb->iso_frame_desc[u].offset = totlen;
1254                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1255                 totlen += isopkt[u].length;
1256         }
1257         kfree(isopkt);
1258         as->ps = ps;
1259         as->userurb = arg;
1260         if (is_in && uurb->buffer_length > 0)
1261                 as->userbuffer = uurb->buffer;
1262         else
1263                 as->userbuffer = NULL;
1264         as->signr = uurb->signr;
1265         as->ifnum = ifnum;
1266         as->pid = get_pid(task_pid(current));
1267         as->uid = cred->uid;
1268         as->euid = cred->euid;
1269         security_task_getsecid(current, &as->secid);
1270         if (!is_in && uurb->buffer_length > 0) {
1271                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1272                                 uurb->buffer_length)) {
1273                         free_async(as);
1274                         return -EFAULT;
1275                 }
1276         }
1277         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1278                         as->urb->transfer_buffer_length, 0, SUBMIT,
1279                         is_in ? NULL : as->urb->transfer_buffer,
1280                                 uurb->buffer_length);
1281         async_newpending(as);
1282
1283         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1284                 spin_lock_irq(&ps->lock);
1285
1286                 /* Not exactly the endpoint address; the direction bit is
1287                  * shifted to the 0x10 position so that the value will be
1288                  * between 0 and 31.
1289                  */
1290                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1291                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1292                                 >> 3);
1293
1294                 /* If this bulk URB is the start of a new transfer, re-enable
1295                  * the endpoint.  Otherwise mark it as a continuation URB.
1296                  */
1297                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1298                         as->bulk_status = AS_CONTINUATION;
1299                 else
1300                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1301
1302                 /* Don't accept continuation URBs if the endpoint is
1303                  * disabled because of an earlier error.
1304                  */
1305                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1306                         ret = -EREMOTEIO;
1307                 else
1308                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1309                 spin_unlock_irq(&ps->lock);
1310         } else {
1311                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1312         }
1313
1314         if (ret) {
1315                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1316                            "usbfs: usb_submit_urb returned %d\n", ret);
1317                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1318                                 0, ret, COMPLETE, NULL, 0);
1319                 async_removepending(as);
1320                 free_async(as);
1321                 return ret;
1322         }
1323         return 0;
1324 }
1325
1326 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1327 {
1328         struct usbdevfs_urb uurb;
1329
1330         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1331                 return -EFAULT;
1332
1333         return proc_do_submiturb(ps, &uurb,
1334                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1335                         arg);
1336 }
1337
1338 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1339 {
1340         struct async *as;
1341
1342         as = async_getpending(ps, arg);
1343         if (!as)
1344                 return -EINVAL;
1345         usb_kill_urb(as->urb);
1346         return 0;
1347 }
1348
1349 static int processcompl(struct async *as, void __user * __user *arg)
1350 {
1351         struct urb *urb = as->urb;
1352         struct usbdevfs_urb __user *userurb = as->userurb;
1353         void __user *addr = as->userurb;
1354         unsigned int i;
1355
1356         if (as->userbuffer && urb->actual_length) {
1357                 if (urb->number_of_packets > 0)         /* Isochronous */
1358                         i = urb->transfer_buffer_length;
1359                 else                                    /* Non-Isoc */
1360                         i = urb->actual_length;
1361                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, i))
1362                         goto err_out;
1363         }
1364         if (put_user(as->status, &userurb->status))
1365                 goto err_out;
1366         if (put_user(urb->actual_length, &userurb->actual_length))
1367                 goto err_out;
1368         if (put_user(urb->error_count, &userurb->error_count))
1369                 goto err_out;
1370
1371         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1372                 for (i = 0; i < urb->number_of_packets; i++) {
1373                         if (put_user(urb->iso_frame_desc[i].actual_length,
1374                                      &userurb->iso_frame_desc[i].actual_length))
1375                                 goto err_out;
1376                         if (put_user(urb->iso_frame_desc[i].status,
1377                                      &userurb->iso_frame_desc[i].status))
1378                                 goto err_out;
1379                 }
1380         }
1381
1382         if (put_user(addr, (void __user * __user *)arg))
1383                 return -EFAULT;
1384         return 0;
1385
1386 err_out:
1387         return -EFAULT;
1388 }
1389
1390 static struct async *reap_as(struct dev_state *ps)
1391 {
1392         DECLARE_WAITQUEUE(wait, current);
1393         struct async *as = NULL;
1394         struct usb_device *dev = ps->dev;
1395
1396         add_wait_queue(&ps->wait, &wait);
1397         for (;;) {
1398                 __set_current_state(TASK_INTERRUPTIBLE);
1399                 as = async_getcompleted(ps);
1400                 if (as)
1401                         break;
1402                 if (signal_pending(current))
1403                         break;
1404                 usb_unlock_device(dev);
1405                 schedule();
1406                 usb_lock_device(dev);
1407         }
1408         remove_wait_queue(&ps->wait, &wait);
1409         set_current_state(TASK_RUNNING);
1410         return as;
1411 }
1412
1413 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1414 {
1415         struct async *as = reap_as(ps);
1416         if (as) {
1417                 int retval = processcompl(as, (void __user * __user *)arg);
1418                 free_async(as);
1419                 return retval;
1420         }
1421         if (signal_pending(current))
1422                 return -EINTR;
1423         return -EIO;
1424 }
1425
1426 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1427 {
1428         int retval;
1429         struct async *as;
1430
1431         as = async_getcompleted(ps);
1432         retval = -EAGAIN;
1433         if (as) {
1434                 retval = processcompl(as, (void __user * __user *)arg);
1435                 free_async(as);
1436         }
1437         return retval;
1438 }
1439
1440 #ifdef CONFIG_COMPAT
1441 static int proc_control_compat(struct dev_state *ps,
1442                                 struct usbdevfs_ctrltransfer32 __user *p32)
1443 {
1444         struct usbdevfs_ctrltransfer __user *p;
1445         __u32 udata;
1446         p = compat_alloc_user_space(sizeof(*p));
1447         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1448             get_user(udata, &p32->data) ||
1449             put_user(compat_ptr(udata), &p->data))
1450                 return -EFAULT;
1451         return proc_control(ps, p);
1452 }
1453
1454 static int proc_bulk_compat(struct dev_state *ps,
1455                         struct usbdevfs_bulktransfer32 __user *p32)
1456 {
1457         struct usbdevfs_bulktransfer __user *p;
1458         compat_uint_t n;
1459         compat_caddr_t addr;
1460
1461         p = compat_alloc_user_space(sizeof(*p));
1462
1463         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1464             get_user(n, &p32->len) || put_user(n, &p->len) ||
1465             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1466             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1467                 return -EFAULT;
1468
1469         return proc_bulk(ps, p);
1470 }
1471 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1472 {
1473         struct usbdevfs_disconnectsignal32 ds;
1474
1475         if (copy_from_user(&ds, arg, sizeof(ds)))
1476                 return -EFAULT;
1477         ps->discsignr = ds.signr;
1478         ps->disccontext = compat_ptr(ds.context);
1479         return 0;
1480 }
1481
1482 static int get_urb32(struct usbdevfs_urb *kurb,
1483                      struct usbdevfs_urb32 __user *uurb)
1484 {
1485         __u32  uptr;
1486         if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1487             __get_user(kurb->type, &uurb->type) ||
1488             __get_user(kurb->endpoint, &uurb->endpoint) ||
1489             __get_user(kurb->status, &uurb->status) ||
1490             __get_user(kurb->flags, &uurb->flags) ||
1491             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1492             __get_user(kurb->actual_length, &uurb->actual_length) ||
1493             __get_user(kurb->start_frame, &uurb->start_frame) ||
1494             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1495             __get_user(kurb->error_count, &uurb->error_count) ||
1496             __get_user(kurb->signr, &uurb->signr))
1497                 return -EFAULT;
1498
1499         if (__get_user(uptr, &uurb->buffer))
1500                 return -EFAULT;
1501         kurb->buffer = compat_ptr(uptr);
1502         if (__get_user(uptr, &uurb->usercontext))
1503                 return -EFAULT;
1504         kurb->usercontext = compat_ptr(uptr);
1505
1506         return 0;
1507 }
1508
1509 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1510 {
1511         struct usbdevfs_urb uurb;
1512
1513         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1514                 return -EFAULT;
1515
1516         return proc_do_submiturb(ps, &uurb,
1517                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1518                         arg);
1519 }
1520
1521 static int processcompl_compat(struct async *as, void __user * __user *arg)
1522 {
1523         struct urb *urb = as->urb;
1524         struct usbdevfs_urb32 __user *userurb = as->userurb;
1525         void __user *addr = as->userurb;
1526         unsigned int i;
1527
1528         if (as->userbuffer && urb->actual_length)
1529                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1530                                  urb->actual_length))
1531                         return -EFAULT;
1532         if (put_user(as->status, &userurb->status))
1533                 return -EFAULT;
1534         if (put_user(urb->actual_length, &userurb->actual_length))
1535                 return -EFAULT;
1536         if (put_user(urb->error_count, &userurb->error_count))
1537                 return -EFAULT;
1538
1539         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1540                 for (i = 0; i < urb->number_of_packets; i++) {
1541                         if (put_user(urb->iso_frame_desc[i].actual_length,
1542                                      &userurb->iso_frame_desc[i].actual_length))
1543                                 return -EFAULT;
1544                         if (put_user(urb->iso_frame_desc[i].status,
1545                                      &userurb->iso_frame_desc[i].status))
1546                                 return -EFAULT;
1547                 }
1548         }
1549
1550         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1551                 return -EFAULT;
1552         return 0;
1553 }
1554
1555 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1556 {
1557         struct async *as = reap_as(ps);
1558         if (as) {
1559                 int retval = processcompl_compat(as, (void __user * __user *)arg);
1560                 free_async(as);
1561                 return retval;
1562         }
1563         if (signal_pending(current))
1564                 return -EINTR;
1565         return -EIO;
1566 }
1567
1568 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1569 {
1570         int retval;
1571         struct async *as;
1572
1573         retval = -EAGAIN;
1574         as = async_getcompleted(ps);
1575         if (as) {
1576                 retval = processcompl_compat(as, (void __user * __user *)arg);
1577                 free_async(as);
1578         }
1579         return retval;
1580 }
1581
1582
1583 #endif
1584
1585 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1586 {
1587         struct usbdevfs_disconnectsignal ds;
1588
1589         if (copy_from_user(&ds, arg, sizeof(ds)))
1590                 return -EFAULT;
1591         ps->discsignr = ds.signr;
1592         ps->disccontext = ds.context;
1593         return 0;
1594 }
1595
1596 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1597 {
1598         unsigned int ifnum;
1599
1600         if (get_user(ifnum, (unsigned int __user *)arg))
1601                 return -EFAULT;
1602         return claimintf(ps, ifnum);
1603 }
1604
1605 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1606 {
1607         unsigned int ifnum;
1608         int ret;
1609
1610         if (get_user(ifnum, (unsigned int __user *)arg))
1611                 return -EFAULT;
1612         if ((ret = releaseintf(ps, ifnum)) < 0)
1613                 return ret;
1614         destroy_async_on_interface (ps, ifnum);
1615         return 0;
1616 }
1617
1618 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1619 {
1620         int                     size;
1621         void                    *buf = NULL;
1622         int                     retval = 0;
1623         struct usb_interface    *intf = NULL;
1624         struct usb_driver       *driver = NULL;
1625
1626         /* alloc buffer */
1627         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1628                 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1629                         return -ENOMEM;
1630                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1631                         if (copy_from_user(buf, ctl->data, size)) {
1632                                 kfree(buf);
1633                                 return -EFAULT;
1634                         }
1635                 } else {
1636                         memset(buf, 0, size);
1637                 }
1638         }
1639
1640         if (!connected(ps)) {
1641                 kfree(buf);
1642                 return -ENODEV;
1643         }
1644
1645         if (ps->dev->state != USB_STATE_CONFIGURED)
1646                 retval = -EHOSTUNREACH;
1647         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1648                 retval = -EINVAL;
1649         else switch (ctl->ioctl_code) {
1650
1651         /* disconnect kernel driver from interface */
1652         case USBDEVFS_DISCONNECT:
1653                 if (intf->dev.driver) {
1654                         driver = to_usb_driver(intf->dev.driver);
1655                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1656                         usb_driver_release_interface(driver, intf);
1657                 } else
1658                         retval = -ENODATA;
1659                 break;
1660
1661         /* let kernel drivers try to (re)bind to the interface */
1662         case USBDEVFS_CONNECT:
1663                 if (!intf->dev.driver)
1664                         retval = device_attach(&intf->dev);
1665                 else
1666                         retval = -EBUSY;
1667                 break;
1668
1669         /* talk directly to the interface's driver */
1670         default:
1671                 if (intf->dev.driver)
1672                         driver = to_usb_driver(intf->dev.driver);
1673                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1674                         retval = -ENOTTY;
1675                 } else {
1676                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1677                         if (retval == -ENOIOCTLCMD)
1678                                 retval = -ENOTTY;
1679                 }
1680         }
1681
1682         /* cleanup and return */
1683         if (retval >= 0
1684                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1685                         && size > 0
1686                         && copy_to_user(ctl->data, buf, size) != 0)
1687                 retval = -EFAULT;
1688
1689         kfree(buf);
1690         return retval;
1691 }
1692
1693 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1694 {
1695         struct usbdevfs_ioctl   ctrl;
1696
1697         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1698                 return -EFAULT;
1699         return proc_ioctl(ps, &ctrl);
1700 }
1701
1702 #ifdef CONFIG_COMPAT
1703 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1704 {
1705         struct usbdevfs_ioctl32 __user *uioc;
1706         struct usbdevfs_ioctl ctrl;
1707         u32 udata;
1708
1709         uioc = compat_ptr((long)arg);
1710         if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1711             __get_user(ctrl.ifno, &uioc->ifno) ||
1712             __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1713             __get_user(udata, &uioc->data))
1714                 return -EFAULT;
1715         ctrl.data = compat_ptr(udata);
1716
1717         return proc_ioctl(ps, &ctrl);
1718 }
1719 #endif
1720
1721 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1722 {
1723         unsigned portnum;
1724         int rc;
1725
1726         if (get_user(portnum, (unsigned __user *) arg))
1727                 return -EFAULT;
1728         rc = usb_hub_claim_port(ps->dev, portnum, ps);
1729         if (rc == 0)
1730                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1731                         portnum, task_pid_nr(current), current->comm);
1732         return rc;
1733 }
1734
1735 static int proc_release_port(struct dev_state *ps, void __user *arg)
1736 {
1737         unsigned portnum;
1738
1739         if (get_user(portnum, (unsigned __user *) arg))
1740                 return -EFAULT;
1741         return usb_hub_release_port(ps->dev, portnum, ps);
1742 }
1743
1744 /*
1745  * NOTE:  All requests here that have interface numbers as parameters
1746  * are assuming that somehow the configuration has been prevented from
1747  * changing.  But there's no mechanism to ensure that...
1748  */
1749 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1750                                 void __user *p)
1751 {
1752         struct dev_state *ps = file->private_data;
1753         struct inode *inode = file->f_path.dentry->d_inode;
1754         struct usb_device *dev = ps->dev;
1755         int ret = -ENOTTY;
1756
1757         if (!(file->f_mode & FMODE_WRITE))
1758                 return -EPERM;
1759
1760         usb_lock_device(dev);
1761         if (!connected(ps)) {
1762                 usb_unlock_device(dev);
1763                 return -ENODEV;
1764         }
1765
1766         switch (cmd) {
1767         case USBDEVFS_CONTROL:
1768                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1769                 ret = proc_control(ps, p);
1770                 if (ret >= 0)
1771                         inode->i_mtime = CURRENT_TIME;
1772                 break;
1773
1774         case USBDEVFS_BULK:
1775                 snoop(&dev->dev, "%s: BULK\n", __func__);
1776                 ret = proc_bulk(ps, p);
1777                 if (ret >= 0)
1778                         inode->i_mtime = CURRENT_TIME;
1779                 break;
1780
1781         case USBDEVFS_RESETEP:
1782                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1783                 ret = proc_resetep(ps, p);
1784                 if (ret >= 0)
1785                         inode->i_mtime = CURRENT_TIME;
1786                 break;
1787
1788         case USBDEVFS_RESET:
1789                 snoop(&dev->dev, "%s: RESET\n", __func__);
1790                 ret = proc_resetdevice(ps);
1791                 break;
1792
1793         case USBDEVFS_CLEAR_HALT:
1794                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1795                 ret = proc_clearhalt(ps, p);
1796                 if (ret >= 0)
1797                         inode->i_mtime = CURRENT_TIME;
1798                 break;
1799
1800         case USBDEVFS_GETDRIVER:
1801                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1802                 ret = proc_getdriver(ps, p);
1803                 break;
1804
1805         case USBDEVFS_CONNECTINFO:
1806                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1807                 ret = proc_connectinfo(ps, p);
1808                 break;
1809
1810         case USBDEVFS_SETINTERFACE:
1811                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1812                 ret = proc_setintf(ps, p);
1813                 break;
1814
1815         case USBDEVFS_SETCONFIGURATION:
1816                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1817                 ret = proc_setconfig(ps, p);
1818                 break;
1819
1820         case USBDEVFS_SUBMITURB:
1821                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1822                 ret = proc_submiturb(ps, p);
1823                 if (ret >= 0)
1824                         inode->i_mtime = CURRENT_TIME;
1825                 break;
1826
1827 #ifdef CONFIG_COMPAT
1828         case USBDEVFS_CONTROL32:
1829                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
1830                 ret = proc_control_compat(ps, p);
1831                 if (ret >= 0)
1832                         inode->i_mtime = CURRENT_TIME;
1833                 break;
1834
1835         case USBDEVFS_BULK32:
1836                 snoop(&dev->dev, "%s: BULK32\n", __func__);
1837                 ret = proc_bulk_compat(ps, p);
1838                 if (ret >= 0)
1839                         inode->i_mtime = CURRENT_TIME;
1840                 break;
1841
1842         case USBDEVFS_DISCSIGNAL32:
1843                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
1844                 ret = proc_disconnectsignal_compat(ps, p);
1845                 break;
1846
1847         case USBDEVFS_SUBMITURB32:
1848                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1849                 ret = proc_submiturb_compat(ps, p);
1850                 if (ret >= 0)
1851                         inode->i_mtime = CURRENT_TIME;
1852                 break;
1853
1854         case USBDEVFS_REAPURB32:
1855                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1856                 ret = proc_reapurb_compat(ps, p);
1857                 break;
1858
1859         case USBDEVFS_REAPURBNDELAY32:
1860                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
1861                 ret = proc_reapurbnonblock_compat(ps, p);
1862                 break;
1863
1864         case USBDEVFS_IOCTL32:
1865                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
1866                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1867                 break;
1868 #endif
1869
1870         case USBDEVFS_DISCARDURB:
1871                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1872                 ret = proc_unlinkurb(ps, p);
1873                 break;
1874
1875         case USBDEVFS_REAPURB:
1876                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1877                 ret = proc_reapurb(ps, p);
1878                 break;
1879
1880         case USBDEVFS_REAPURBNDELAY:
1881                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
1882                 ret = proc_reapurbnonblock(ps, p);
1883                 break;
1884
1885         case USBDEVFS_DISCSIGNAL:
1886                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1887                 ret = proc_disconnectsignal(ps, p);
1888                 break;
1889
1890         case USBDEVFS_CLAIMINTERFACE:
1891                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1892                 ret = proc_claiminterface(ps, p);
1893                 break;
1894
1895         case USBDEVFS_RELEASEINTERFACE:
1896                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1897                 ret = proc_releaseinterface(ps, p);
1898                 break;
1899
1900         case USBDEVFS_IOCTL:
1901                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1902                 ret = proc_ioctl_default(ps, p);
1903                 break;
1904
1905         case USBDEVFS_CLAIM_PORT:
1906                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
1907                 ret = proc_claim_port(ps, p);
1908                 break;
1909
1910         case USBDEVFS_RELEASE_PORT:
1911                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
1912                 ret = proc_release_port(ps, p);
1913                 break;
1914         }
1915         usb_unlock_device(dev);
1916         if (ret >= 0)
1917                 inode->i_atime = CURRENT_TIME;
1918         return ret;
1919 }
1920
1921 static long usbdev_ioctl(struct file *file, unsigned int cmd,
1922                         unsigned long arg)
1923 {
1924         int ret;
1925
1926         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
1927
1928         return ret;
1929 }
1930
1931 #ifdef CONFIG_COMPAT
1932 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
1933                         unsigned long arg)
1934 {
1935         int ret;
1936
1937         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
1938
1939         return ret;
1940 }
1941 #endif
1942
1943 /* No kernel lock - fine */
1944 static unsigned int usbdev_poll(struct file *file,
1945                                 struct poll_table_struct *wait)
1946 {
1947         struct dev_state *ps = file->private_data;
1948         unsigned int mask = 0;
1949
1950         poll_wait(file, &ps->wait, wait);
1951         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1952                 mask |= POLLOUT | POLLWRNORM;
1953         if (!connected(ps))
1954                 mask |= POLLERR | POLLHUP;
1955         return mask;
1956 }
1957
1958 const struct file_operations usbdev_file_operations = {
1959         .owner =          THIS_MODULE,
1960         .llseek =         usbdev_lseek,
1961         .read =           usbdev_read,
1962         .poll =           usbdev_poll,
1963         .unlocked_ioctl = usbdev_ioctl,
1964 #ifdef CONFIG_COMPAT
1965         .compat_ioctl =   usbdev_compat_ioctl,
1966 #endif
1967         .open =           usbdev_open,
1968         .release =        usbdev_release,
1969 };
1970
1971 static void usbdev_remove(struct usb_device *udev)
1972 {
1973         struct dev_state *ps;
1974         struct siginfo sinfo;
1975
1976         while (!list_empty(&udev->filelist)) {
1977                 ps = list_entry(udev->filelist.next, struct dev_state, list);
1978                 destroy_all_async(ps);
1979                 wake_up_all(&ps->wait);
1980                 list_del_init(&ps->list);
1981                 if (ps->discsignr) {
1982                         sinfo.si_signo = ps->discsignr;
1983                         sinfo.si_errno = EPIPE;
1984                         sinfo.si_code = SI_ASYNCIO;
1985                         sinfo.si_addr = ps->disccontext;
1986                         kill_pid_info_as_uid(ps->discsignr, &sinfo,
1987                                         ps->disc_pid, ps->disc_uid,
1988                                         ps->disc_euid, ps->secid);
1989                 }
1990         }
1991 }
1992
1993 #ifdef CONFIG_USB_DEVICE_CLASS
1994 static struct class *usb_classdev_class;
1995
1996 static int usb_classdev_add(struct usb_device *dev)
1997 {
1998         struct device *cldev;
1999
2000         cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
2001                               NULL, "usbdev%d.%d", dev->bus->busnum,
2002                               dev->devnum);
2003         if (IS_ERR(cldev))
2004                 return PTR_ERR(cldev);
2005         dev->usb_classdev = cldev;
2006         return 0;
2007 }
2008
2009 static void usb_classdev_remove(struct usb_device *dev)
2010 {
2011         if (dev->usb_classdev)
2012                 device_unregister(dev->usb_classdev);
2013 }
2014
2015 #else
2016 #define usb_classdev_add(dev)           0
2017 #define usb_classdev_remove(dev)        do {} while (0)
2018
2019 #endif
2020
2021 static int usbdev_notify(struct notifier_block *self,
2022                                unsigned long action, void *dev)
2023 {
2024         switch (action) {
2025         case USB_DEVICE_ADD:
2026                 if (usb_classdev_add(dev))
2027                         return NOTIFY_BAD;
2028                 break;
2029         case USB_DEVICE_REMOVE:
2030                 usb_classdev_remove(dev);
2031                 usbdev_remove(dev);
2032                 break;
2033         }
2034         return NOTIFY_OK;
2035 }
2036
2037 static struct notifier_block usbdev_nb = {
2038         .notifier_call =        usbdev_notify,
2039 };
2040
2041 static struct cdev usb_device_cdev;
2042
2043 int __init usb_devio_init(void)
2044 {
2045         int retval;
2046
2047         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2048                                         "usb_device");
2049         if (retval) {
2050                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2051                 goto out;
2052         }
2053         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2054         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2055         if (retval) {
2056                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2057                        USB_DEVICE_MAJOR);
2058                 goto error_cdev;
2059         }
2060 #ifdef CONFIG_USB_DEVICE_CLASS
2061         usb_classdev_class = class_create(THIS_MODULE, "usb_device");
2062         if (IS_ERR(usb_classdev_class)) {
2063                 printk(KERN_ERR "Unable to register usb_device class\n");
2064                 retval = PTR_ERR(usb_classdev_class);
2065                 cdev_del(&usb_device_cdev);
2066                 usb_classdev_class = NULL;
2067                 goto out;
2068         }
2069         /* devices of this class shadow the major:minor of their parent
2070          * device, so clear ->dev_kobj to prevent adding duplicate entries
2071          * to /sys/dev
2072          */
2073         usb_classdev_class->dev_kobj = NULL;
2074 #endif
2075         usb_register_notify(&usbdev_nb);
2076 out:
2077         return retval;
2078
2079 error_cdev:
2080         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2081         goto out;
2082 }
2083
2084 void usb_devio_cleanup(void)
2085 {
2086         usb_unregister_notify(&usbdev_nb);
2087 #ifdef CONFIG_USB_DEVICE_CLASS
2088         class_destroy(usb_classdev_class);
2089 #endif
2090         cdev_del(&usb_device_cdev);
2091         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2092 }