drivers/usb/core/devio.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *      devio.c  --  User space communication with USB devices.
   5  *
   6  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   7  *
   8  *      This program is free software; you can redistribute it and/or modify
   9  *      it under the terms of the GNU General Public License as published by
  10  *      the Free Software Foundation; either version 2 of the License, or
  11  *      (at your option) any later version.
  12  *
  13  *      This program is distributed in the hope that it will be useful,
  14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *      GNU General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License
  19  *      along with this program; if not, write to the Free Software
  20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  *  This file implements the usbfs/x/y files, where
  23  *  x is the bus number and y the device number.
  24  *
  25  *  It allows user space programs/"drivers" to communicate directly
  26  *  with USB devices without intervening kernel driver.
  27  *
  28  *  Revision history
  29  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  30  *    04.01.2000   0.2   Turned into its own filesystem
  31  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  32  *                       (CAN-2005-3055)
  33  */
  34
  35 /*****************************************************************************/
  36
  37 #include <linux/fs.h>
  38 #include <linux/mm.h>
  39 #include <linux/slab.h>
  40 #include <linux/signal.h>
  41 #include <linux/poll.h>
  42 #include <linux/module.h>
  43 #include <linux/usb.h>
  44 #include <linux/usbdevice_fs.h>
  45 #include <linux/usb/hcd.h>      /* for usbcore internals */
  46 #include <linux/cdev.h>
  47 #include <linux/notifier.h>
  48 #include <linux/security.h>
  49 #include <linux/user_namespace.h>
  50 #include <asm/uaccess.h>
  51 #include <asm/byteorder.h>
  52 #include <linux/moduleparam.h>
  53
  54 #include "usb.h"
  55
  56 #define USB_MAXBUS                      64
  57 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
  58
  59 /* Mutual exclusion for removal, open, and release */
  60 DEFINE_MUTEX(usbfs_mutex);
  61
  62 struct dev_state {
  63         struct list_head list;      /* state list */
  64         struct usb_device *dev;
  65         struct file *file;
  66         spinlock_t lock;            /* protects the async urb lists */
  67         struct list_head async_pending;
  68         struct list_head async_completed;
  69         wait_queue_head_t wait;     /* wake up if a request completed */
  70         unsigned int discsignr;
  71         struct pid *disc_pid;
  72         const struct cred *cred;
  73         void __user *disccontext;
  74         unsigned long ifclaimed;
  75         u32 secid;
  76         u32 disabled_bulk_eps;
  77 };
  78
  79 struct async {
  80         struct list_head asynclist;
  81         struct dev_state *ps;
  82         struct pid *pid;
  83         const struct cred *cred;
  84         unsigned int signr;
  85         unsigned int ifnum;
  86         void __user *userbuffer;
  87         void __user *userurb;
  88         struct urb *urb;
  89         int status;
  90         u32 secid;
  91         u8 bulk_addr;
  92         u8 bulk_status;
  93 };
  94
  95 static int usbfs_snoop;
  96 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  97 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
  98
  99 #define snoop(dev, format, arg...)                              \
 100         do {                                                    \
 101                 if (usbfs_snoop)                                \
 102                         dev_info(dev , format , ## arg);        \
 103         } while (0)
 104
 105 enum snoop_when {
 106         SUBMIT, COMPLETE
 107 };
 108
 109 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 110
 111 #define MAX_USBFS_BUFFER_SIZE   16384
 112
 113
 114 static int connected(struct dev_state *ps)
 115 {
 116         return (!list_empty(&ps->list) &&
 117                         ps->dev->state != USB_STATE_NOTATTACHED);
 118 }
 119
 120 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
 121 {
 122         loff_t ret;
 123
 124         mutex_lock(&file->f_dentry->d_inode->i_mutex);
 125
 126         switch (orig) {
 127         case 0:
 128                 file->f_pos = offset;
 129                 ret = file->f_pos;
 130                 break;
 131         case 1:
 132                 file->f_pos += offset;
 133                 ret = file->f_pos;
 134                 break;
 135         case 2:
 136         default:
 137                 ret = -EINVAL;
 138         }
 139
 140         mutex_unlock(&file->f_dentry->d_inode->i_mutex);
 141         return ret;
 142 }
 143
 144 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 145                            loff_t *ppos)
 146 {
 147         struct dev_state *ps = file->private_data;
 148         struct usb_device *dev = ps->dev;
 149         ssize_t ret = 0;
 150         unsigned len;
 151         loff_t pos;
 152         int i;
 153
 154         pos = *ppos;
 155         usb_lock_device(dev);
 156         if (!connected(ps)) {
 157                 ret = -ENODEV;
 158                 goto err;
 159         } else if (pos < 0) {
 160                 ret = -EINVAL;
 161                 goto err;
 162         }
 163
 164         if (pos < sizeof(struct usb_device_descriptor)) {
 165                 /* 18 bytes - fits on the stack */
 166                 struct usb_device_descriptor temp_desc;
 167
 168                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 169                 le16_to_cpus(&temp_desc.bcdUSB);
 170                 le16_to_cpus(&temp_desc.idVendor);
 171                 le16_to_cpus(&temp_desc.idProduct);
 172                 le16_to_cpus(&temp_desc.bcdDevice);
 173
 174                 len = sizeof(struct usb_device_descriptor) - pos;
 175                 if (len > nbytes)
 176                         len = nbytes;
 177                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 178                         ret = -EFAULT;
 179                         goto err;
 180                 }
 181
 182                 *ppos += len;
 183                 buf += len;
 184                 nbytes -= len;
 185                 ret += len;
 186         }
 187
 188         pos = sizeof(struct usb_device_descriptor);
 189         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 190                 struct usb_config_descriptor *config =
 191                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 192                 unsigned int length = le16_to_cpu(config->wTotalLength);
 193
 194                 if (*ppos < pos + length) {
 195
 196                         /* The descriptor may claim to be longer than it
 197                          * really is.  Here is the actual allocated length. */
 198                         unsigned alloclen =
 199                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 200
 201                         len = length - (*ppos - pos);
 202                         if (len > nbytes)
 203                                 len = nbytes;
 204
 205                         /* Simply don't write (skip over) unallocated parts */
 206                         if (alloclen > (*ppos - pos)) {
 207                                 alloclen -= (*ppos - pos);
 208                                 if (copy_to_user(buf,
 209                                     dev->rawdescriptors[i] + (*ppos - pos),
 210                                     min(len, alloclen))) {
 211                                         ret = -EFAULT;
 212                                         goto err;
 213                                 }
 214                         }
 215
 216                         *ppos += len;
 217                         buf += len;
 218                         nbytes -= len;
 219                         ret += len;
 220                 }
 221
 222                 pos += length;
 223         }
 224
 225 err:
 226         usb_unlock_device(dev);
 227         return ret;
 228 }
 229
 230 /*
 231  * async list handling
 232  */
 233
 234 static struct async *alloc_async(unsigned int numisoframes)
 235 {
 236         struct async *as;
 237
 238         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 239         if (!as)
 240                 return NULL;
 241         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 242         if (!as->urb) {
 243                 kfree(as);
 244                 return NULL;
 245         }
 246         return as;
 247 }
 248
 249 static void free_async(struct async *as)
 250 {
 251         put_pid(as->pid);
 252         if (as->cred)
 253                 put_cred(as->cred);
 254         kfree(as->urb->transfer_buffer);
 255         kfree(as->urb->setup_packet);
 256         usb_free_urb(as->urb);
 257         kfree(as);
 258 }
 259
 260 static void async_newpending(struct async *as)
 261 {
 262         struct dev_state *ps = as->ps;
 263         unsigned long flags;
 264
 265         spin_lock_irqsave(&ps->lock, flags);
 266         list_add_tail(&as->asynclist, &ps->async_pending);
 267         spin_unlock_irqrestore(&ps->lock, flags);
 268 }
 269
 270 static void async_removepending(struct async *as)
 271 {
 272         struct dev_state *ps = as->ps;
 273         unsigned long flags;
 274
 275         spin_lock_irqsave(&ps->lock, flags);
 276         list_del_init(&as->asynclist);
 277         spin_unlock_irqrestore(&ps->lock, flags);
 278 }
 279
 280 static struct async *async_getcompleted(struct dev_state *ps)
 281 {
 282         unsigned long flags;
 283         struct async *as = NULL;
 284
 285         spin_lock_irqsave(&ps->lock, flags);
 286         if (!list_empty(&ps->async_completed)) {
 287                 as = list_entry(ps->async_completed.next, struct async,
 288                                 asynclist);
 289                 list_del_init(&as->asynclist);
 290         }
 291         spin_unlock_irqrestore(&ps->lock, flags);
 292         return as;
 293 }
 294
 295 static struct async *async_getpending(struct dev_state *ps,
 296                                              void __user *userurb)
 297 {
 298         struct async *as;
 299
 300         list_for_each_entry(as, &ps->async_pending, asynclist)
 301                 if (as->userurb == userurb) {
 302                         list_del_init(&as->asynclist);
 303                         return as;
 304                 }
 305
 306         return NULL;
 307 }
 308
 309 static void snoop_urb(struct usb_device *udev,
 310                 void __user *userurb, int pipe, unsigned length,
 311                 int timeout_or_status, enum snoop_when when,
 312                 unsigned char *data, unsigned data_len)
 313 {
 314         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 315         static const char *dirs[] = {"out", "in"};
 316         int ep;
 317         const char *t, *d;
 318
 319         if (!usbfs_snoop)
 320                 return;
 321
 322         ep = usb_pipeendpoint(pipe);
 323         t = types[usb_pipetype(pipe)];
 324         d = dirs[!!usb_pipein(pipe)];
 325
 326         if (userurb) {          /* Async */
 327                 if (when == SUBMIT)
 328                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 329                                         "length %u\n",
 330                                         userurb, ep, t, d, length);
 331                 else
 332                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 333                                         "actual_length %u status %d\n",
 334                                         userurb, ep, t, d, length,
 335                                         timeout_or_status);
 336         } else {
 337                 if (when == SUBMIT)
 338                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 339                                         "timeout %d\n",
 340                                         ep, t, d, length, timeout_or_status);
 341                 else
 342                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 343                                         "status %d\n",
 344                                         ep, t, d, length, timeout_or_status);
 345         }
 346
 347         if (data && data_len > 0) {
 348                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 349                         data, data_len, 1);
 350         }
 351 }
 352
 353 #define AS_CONTINUATION 1
 354 #define AS_UNLINK       2
 355
 356 static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr)
 357 __releases(ps->lock)
 358 __acquires(ps->lock)
 359 {
 360         struct urb *urb;
 361         struct async *as;
 362
 363         /* Mark all the pending URBs that match bulk_addr, up to but not
 364          * including the first one without AS_CONTINUATION.  If such an
 365          * URB is encountered then a new transfer has already started so
 366          * the endpoint doesn't need to be disabled; otherwise it does.
 367          */
 368         list_for_each_entry(as, &ps->async_pending, asynclist) {
 369                 if (as->bulk_addr == bulk_addr) {
 370                         if (as->bulk_status != AS_CONTINUATION)
 371                                 goto rescan;
 372                         as->bulk_status = AS_UNLINK;
 373                         as->bulk_addr = 0;
 374                 }
 375         }
 376         ps->disabled_bulk_eps |= (1 << bulk_addr);
 377
 378         /* Now carefully unlink all the marked pending URBs */
 379  rescan:
 380         list_for_each_entry(as, &ps->async_pending, asynclist) {
 381                 if (as->bulk_status == AS_UNLINK) {
 382                         as->bulk_status = 0;            /* Only once */
 383                         urb = as->urb;
 384                         usb_get_urb(urb);
 385                         spin_unlock(&ps->lock);         /* Allow completions */
 386                         usb_unlink_urb(urb);
 387                         usb_put_urb(urb);
 388                         spin_lock(&ps->lock);
 389                         goto rescan;
 390                 }
 391         }
 392 }
 393
 394 static void async_completed(struct urb *urb)
 395 {
 396         struct async *as = urb->context;
 397         struct dev_state *ps = as->ps;
 398         struct siginfo sinfo;
 399         struct pid *pid = NULL;
 400         u32 secid = 0;
 401         const struct cred *cred = NULL;
 402         int signr;
 403
 404         spin_lock(&ps->lock);
 405         list_move_tail(&as->asynclist, &ps->async_completed);
 406         as->status = urb->status;
 407         signr = as->signr;
 408         if (signr) {
 409                 memset(&sinfo, 0, sizeof(sinfo));
 410                 sinfo.si_signo = as->signr;
 411                 sinfo.si_errno = as->status;
 412                 sinfo.si_code = SI_ASYNCIO;
 413                 sinfo.si_addr = as->userurb;
 414                 pid = get_pid(as->pid);
 415                 cred = get_cred(as->cred);
 416                 secid = as->secid;
 417         }
 418         snoop(&urb->dev->dev, "urb complete\n");
 419         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 420                         as->status, COMPLETE,
 421                         ((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_OUT) ?
 422                                 NULL : urb->transfer_buffer, urb->actual_length);
 423         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 424                         as->status != -ENOENT)
 425                 cancel_bulk_urbs(ps, as->bulk_addr);
 426         spin_unlock(&ps->lock);
 427
 428         if (signr) {
 429                 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
 430                 put_pid(pid);
 431                 put_cred(cred);
 432         }
 433
 434         wake_up(&ps->wait);
 435 }
 436
 437 static void destroy_async(struct dev_state *ps, struct list_head *list)
 438 {
 439         struct urb *urb;
 440         struct async *as;
 441         unsigned long flags;
 442
 443         spin_lock_irqsave(&ps->lock, flags);
 444         while (!list_empty(list)) {
 445                 as = list_entry(list->next, struct async, asynclist);
 446                 list_del_init(&as->asynclist);
 447                 urb = as->urb;
 448                 usb_get_urb(urb);
 449
 450                 /* drop the spinlock so the completion handler can run */
 451                 spin_unlock_irqrestore(&ps->lock, flags);
 452                 usb_kill_urb(urb);
 453                 usb_put_urb(urb);
 454                 spin_lock_irqsave(&ps->lock, flags);
 455         }
 456         spin_unlock_irqrestore(&ps->lock, flags);
 457 }
 458
 459 static void destroy_async_on_interface(struct dev_state *ps,
 460                                        unsigned int ifnum)
 461 {
 462         struct list_head *p, *q, hitlist;
 463         unsigned long flags;
 464
 465         INIT_LIST_HEAD(&hitlist);
 466         spin_lock_irqsave(&ps->lock, flags);
 467         list_for_each_safe(p, q, &ps->async_pending)
 468                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 469                         list_move_tail(p, &hitlist);
 470         spin_unlock_irqrestore(&ps->lock, flags);
 471         destroy_async(ps, &hitlist);
 472 }
 473
 474 static void destroy_all_async(struct dev_state *ps)
 475 {
 476         destroy_async(ps, &ps->async_pending);
 477 }
 478
 479 /*
 480  * interface claims are made only at the request of user level code,
 481  * which can also release them (explicitly or by closing files).
 482  * they're also undone when devices disconnect.
 483  */
 484
 485 static int driver_probe(struct usb_interface *intf,
 486                         const struct usb_device_id *id)
 487 {
 488         return -ENODEV;
 489 }
 490
 491 static void driver_disconnect(struct usb_interface *intf)
 492 {
 493         struct dev_state *ps = usb_get_intfdata(intf);
 494         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 495
 496         if (!ps)
 497                 return;
 498
 499         /* NOTE:  this relies on usbcore having canceled and completed
 500          * all pending I/O requests; 2.6 does that.
 501          */
 502
 503         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 504                 clear_bit(ifnum, &ps->ifclaimed);
 505         else
 506                 dev_warn(&intf->dev, "interface number %u out of range\n",
 507                          ifnum);
 508
 509         usb_set_intfdata(intf, NULL);
 510
 511         /* force async requests to complete */
 512         destroy_async_on_interface(ps, ifnum);
 513 }
 514
 515 /* The following routines are merely placeholders.  There is no way
 516  * to inform a user task about suspend or resumes.
 517  */
 518 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 519 {
 520         return 0;
 521 }
 522
 523 static int driver_resume(struct usb_interface *intf)
 524 {
 525         return 0;
 526 }
 527
 528 struct usb_driver usbfs_driver = {
 529         .name =         "usbfs",
 530         .probe =        driver_probe,
 531         .disconnect =   driver_disconnect,
 532         .suspend =      driver_suspend,
 533         .resume =       driver_resume,
 534 };
 535
 536 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 537 {
 538         struct usb_device *dev = ps->dev;
 539         struct usb_interface *intf;
 540         int err;
 541
 542         if (ifnum >= 8*sizeof(ps->ifclaimed))
 543                 return -EINVAL;
 544         /* already claimed */
 545         if (test_bit(ifnum, &ps->ifclaimed))
 546                 return 0;
 547
 548         intf = usb_ifnum_to_if(dev, ifnum);
 549         if (!intf)
 550                 err = -ENOENT;
 551         else
 552                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 553         if (err == 0)
 554                 set_bit(ifnum, &ps->ifclaimed);
 555         return err;
 556 }
 557
 558 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 559 {
 560         struct usb_device *dev;
 561         struct usb_interface *intf;
 562         int err;
 563
 564         err = -EINVAL;
 565         if (ifnum >= 8*sizeof(ps->ifclaimed))
 566                 return err;
 567         dev = ps->dev;
 568         intf = usb_ifnum_to_if(dev, ifnum);
 569         if (!intf)
 570                 err = -ENOENT;
 571         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 572                 usb_driver_release_interface(&usbfs_driver, intf);
 573                 err = 0;
 574         }
 575         return err;
 576 }
 577
 578 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 579 {
 580         if (ps->dev->state != USB_STATE_CONFIGURED)
 581                 return -EHOSTUNREACH;
 582         if (ifnum >= 8*sizeof(ps->ifclaimed))
 583                 return -EINVAL;
 584         if (test_bit(ifnum, &ps->ifclaimed))
 585                 return 0;
 586         /* if not yet claimed, claim it for the driver */
 587         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 588                  "interface %u before use\n", task_pid_nr(current),
 589                  current->comm, ifnum);
 590         return claimintf(ps, ifnum);
 591 }
 592
 593 static int findintfep(struct usb_device *dev, unsigned int ep)
 594 {
 595         unsigned int i, j, e;
 596         struct usb_interface *intf;
 597         struct usb_host_interface *alts;
 598         struct usb_endpoint_descriptor *endpt;
 599
 600         if (ep & ~(USB_DIR_IN|0xf))
 601                 return -EINVAL;
 602         if (!dev->actconfig)
 603                 return -ESRCH;
 604         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 605                 intf = dev->actconfig->interface[i];
 606                 for (j = 0; j < intf->num_altsetting; j++) {
 607                         alts = &intf->altsetting[j];
 608                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 609                                 endpt = &alts->endpoint[e].desc;
 610                                 if (endpt->bEndpointAddress == ep)
 611                                         return alts->desc.bInterfaceNumber;
 612                         }
 613                 }
 614         }
 615         return -ENOENT;
 616 }
 617
 618 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
 619                            unsigned int request, unsigned int index)
 620 {
 621         int ret = 0;
 622         struct usb_host_interface *alt_setting;
 623
 624         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 625          && ps->dev->state != USB_STATE_ADDRESS
 626          && ps->dev->state != USB_STATE_CONFIGURED)
 627                 return -EHOSTUNREACH;
 628         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 629                 return 0;
 630
 631         /*
 632          * check for the special corner case 'get_device_id' in the printer
 633          * class specification, where wIndex is (interface << 8 | altsetting)
 634          * instead of just interface
 635          */
 636         if (requesttype == 0xa1 && request == 0) {
 637                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
 638                                                    index >> 8, index & 0xff);
 639                 if (alt_setting
 640                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
 641                         index >>= 8;
 642         }
 643
 644         index &= 0xff;
 645         switch (requesttype & USB_RECIP_MASK) {
 646         case USB_RECIP_ENDPOINT:
 647                 if ((index & ~USB_DIR_IN) == 0)
 648                         return 0;
 649                 ret = findintfep(ps->dev, index);
 650                 if (ret < 0) {
 651                         /*
 652                          * Some not fully compliant Win apps seem to get
 653                          * index wrong and have the endpoint number here
 654                          * rather than the endpoint address (with the
 655                          * correct direction). Win does let this through,
 656                          * so we'll not reject it here but leave it to
 657                          * the device to not break KVM. But we warn.
 658                          */
 659                         ret = findintfep(ps->dev, index ^ 0x80);
 660                         if (ret >= 0)
 661                                 dev_info(&ps->dev->dev,
 662                                         "%s: process %i (%s) requesting ep %02x but needs %02x\n",
 663                                         __func__, task_pid_nr(current),
 664                                         current->comm, index, index ^ 0x80);
 665                 }
 666                 if (ret >= 0)
 667                         ret = checkintf(ps, ret);
 668                 break;
 669
 670         case USB_RECIP_INTERFACE:
 671                 ret = checkintf(ps, index);
 672                 break;
 673         }
 674         return ret;
 675 }
 676
 677 static int match_devt(struct device *dev, void *data)
 678 {
 679         return dev->devt == (dev_t) (unsigned long) data;
 680 }
 681
 682 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 683 {
 684         struct device *dev;
 685
 686         dev = bus_find_device(&usb_bus_type, NULL,
 687                               (void *) (unsigned long) devt, match_devt);
 688         if (!dev)
 689                 return NULL;
 690         return container_of(dev, struct usb_device, dev);
 691 }
 692
 693 /*
 694  * file operations
 695  */
 696 static int usbdev_open(struct inode *inode, struct file *file)
 697 {
 698         struct usb_device *dev = NULL;
 699         struct dev_state *ps;
 700         int ret;
 701
 702         ret = -ENOMEM;
 703         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
 704         if (!ps)
 705                 goto out_free_ps;
 706
 707         ret = -ENODEV;
 708
 709         /* Protect against simultaneous removal or release */
 710         mutex_lock(&usbfs_mutex);
 711
 712         /* usbdev device-node */
 713         if (imajor(inode) == USB_DEVICE_MAJOR)
 714                 dev = usbdev_lookup_by_devt(inode->i_rdev);
 715
 716 #ifdef CONFIG_USB_DEVICEFS
 717         /* procfs file */
 718         if (!dev) {
 719                 dev = inode->i_private;
 720                 if (dev && dev->usbfs_dentry &&
 721                                         dev->usbfs_dentry->d_inode == inode)
 722                         usb_get_dev(dev);
 723                 else
 724                         dev = NULL;
 725         }
 726 #endif
 727         mutex_unlock(&usbfs_mutex);
 728
 729         if (!dev)
 730                 goto out_free_ps;
 731
 732         usb_lock_device(dev);
 733         if (dev->state == USB_STATE_NOTATTACHED)
 734                 goto out_unlock_device;
 735
 736         ret = usb_autoresume_device(dev);
 737         if (ret)
 738                 goto out_unlock_device;
 739
 740         ps->dev = dev;
 741         ps->file = file;
 742         spin_lock_init(&ps->lock);
 743         INIT_LIST_HEAD(&ps->list);
 744         INIT_LIST_HEAD(&ps->async_pending);
 745         INIT_LIST_HEAD(&ps->async_completed);
 746         init_waitqueue_head(&ps->wait);
 747         ps->discsignr = 0;
 748         ps->disc_pid = get_pid(task_pid(current));
 749         ps->cred = get_current_cred();
 750         ps->disccontext = NULL;
 751         ps->ifclaimed = 0;
 752         security_task_getsecid(current, &ps->secid);
 753         smp_wmb();
 754         list_add_tail(&ps->list, &dev->filelist);
 755         file->private_data = ps;
 756         usb_unlock_device(dev);
 757         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
 758                         current->comm);
 759         return ret;
 760
 761  out_unlock_device:
 762         usb_unlock_device(dev);
 763         usb_put_dev(dev);
 764  out_free_ps:
 765         kfree(ps);
 766         return ret;
 767 }
 768
 769 static int usbdev_release(struct inode *inode, struct file *file)
 770 {
 771         struct dev_state *ps = file->private_data;
 772         struct usb_device *dev = ps->dev;
 773         unsigned int ifnum;
 774         struct async *as;
 775
 776         usb_lock_device(dev);
 777         usb_hub_release_all_ports(dev, ps);
 778
 779         list_del_init(&ps->list);
 780
 781         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 782                         ifnum++) {
 783                 if (test_bit(ifnum, &ps->ifclaimed))
 784                         releaseintf(ps, ifnum);
 785         }
 786         destroy_all_async(ps);
 787         usb_autosuspend_device(dev);
 788         usb_unlock_device(dev);
 789         usb_put_dev(dev);
 790         put_pid(ps->disc_pid);
 791         put_cred(ps->cred);
 792
 793         as = async_getcompleted(ps);
 794         while (as) {
 795                 free_async(as);
 796                 as = async_getcompleted(ps);
 797         }
 798         kfree(ps);
 799         return 0;
 800 }
 801
 802 static int proc_control(struct dev_state *ps, void __user *arg)
 803 {
 804         struct usb_device *dev = ps->dev;
 805         struct usbdevfs_ctrltransfer ctrl;
 806         unsigned int tmo;
 807         unsigned char *tbuf;
 808         unsigned wLength;
 809         int i, pipe, ret;
 810
 811         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 812                 return -EFAULT;
 813         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
 814                               ctrl.wIndex);
 815         if (ret)
 816                 return ret;
 817         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
 818         if (wLength > PAGE_SIZE)
 819                 return -EINVAL;
 820         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
 821         if (!tbuf)
 822                 return -ENOMEM;
 823         tmo = ctrl.timeout;
 824         snoop(&dev->dev, "control urb: bRequestType=%02x "
 825                 "bRequest=%02x wValue=%04x "
 826                 "wIndex=%04x wLength=%04x\n",
 827                 ctrl.bRequestType, ctrl.bRequest,
 828                 __le16_to_cpup(&ctrl.wValue),
 829                 __le16_to_cpup(&ctrl.wIndex),
 830                 __le16_to_cpup(&ctrl.wLength));
 831         if (ctrl.bRequestType & 0x80) {
 832                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
 833                                                ctrl.wLength)) {
 834                         free_page((unsigned long)tbuf);
 835                         return -EINVAL;
 836                 }
 837                 pipe = usb_rcvctrlpipe(dev, 0);
 838                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
 839
 840                 usb_unlock_device(dev);
 841                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
 842                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 843                                     tbuf, ctrl.wLength, tmo);
 844                 usb_lock_device(dev);
 845                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
 846                           tbuf, max(i, 0));
 847                 if ((i > 0) && ctrl.wLength) {
 848                         if (copy_to_user(ctrl.data, tbuf, i)) {
 849                                 free_page((unsigned long)tbuf);
 850                                 return -EFAULT;
 851                         }
 852                 }
 853         } else {
 854                 if (ctrl.wLength) {
 855                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 856                                 free_page((unsigned long)tbuf);
 857                                 return -EFAULT;
 858                         }
 859                 }
 860                 pipe = usb_sndctrlpipe(dev, 0);
 861                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
 862                         tbuf, ctrl.wLength);
 863
 864                 usb_unlock_device(dev);
 865                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
 866                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 867                                     tbuf, ctrl.wLength, tmo);
 868                 usb_lock_device(dev);
 869                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
 870         }
 871         free_page((unsigned long)tbuf);
 872         if (i < 0 && i != -EPIPE) {
 873                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 874                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 875                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 876                            ctrl.wLength, i);
 877         }
 878         return i;
 879 }
 880
 881 static int proc_bulk(struct dev_state *ps, void __user *arg)
 882 {
 883         struct usb_device *dev = ps->dev;
 884         struct usbdevfs_bulktransfer bulk;
 885         unsigned int tmo, len1, pipe;
 886         int len2;
 887         unsigned char *tbuf;
 888         int i, ret;
 889
 890         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 891                 return -EFAULT;
 892         ret = findintfep(ps->dev, bulk.ep);
 893         if (ret < 0)
 894                 return ret;
 895         ret = checkintf(ps, ret);
 896         if (ret)
 897                 return ret;
 898         if (bulk.ep & USB_DIR_IN)
 899                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 900         else
 901                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 902         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 903                 return -EINVAL;
 904         len1 = bulk.len;
 905         if (len1 > MAX_USBFS_BUFFER_SIZE)
 906                 return -EINVAL;
 907         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 908                 return -ENOMEM;
 909         tmo = bulk.timeout;
 910         if (bulk.ep & 0x80) {
 911                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 912                         kfree(tbuf);
 913                         return -EINVAL;
 914                 }
 915                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
 916
 917                 usb_unlock_device(dev);
 918                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 919                 usb_lock_device(dev);
 920                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
 921
 922                 if (!i && len2) {
 923                         if (copy_to_user(bulk.data, tbuf, len2)) {
 924                                 kfree(tbuf);
 925                                 return -EFAULT;
 926                         }
 927                 }
 928         } else {
 929                 if (len1) {
 930                         if (copy_from_user(tbuf, bulk.data, len1)) {
 931                                 kfree(tbuf);
 932                                 return -EFAULT;
 933                         }
 934                 }
 935                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
 936
 937                 usb_unlock_device(dev);
 938                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 939                 usb_lock_device(dev);
 940                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
 941         }
 942         kfree(tbuf);
 943         if (i < 0)
 944                 return i;
 945         return len2;
 946 }
 947
 948 static int proc_resetep(struct dev_state *ps, void __user *arg)
 949 {
 950         unsigned int ep;
 951         int ret;
 952
 953         if (get_user(ep, (unsigned int __user *)arg))
 954                 return -EFAULT;
 955         ret = findintfep(ps->dev, ep);
 956         if (ret < 0)
 957                 return ret;
 958         ret = checkintf(ps, ret);
 959         if (ret)
 960                 return ret;
 961         usb_reset_endpoint(ps->dev, ep);
 962         return 0;
 963 }
 964
 965 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 966 {
 967         unsigned int ep;
 968         int pipe;
 969         int ret;
 970
 971         if (get_user(ep, (unsigned int __user *)arg))
 972                 return -EFAULT;
 973         ret = findintfep(ps->dev, ep);
 974         if (ret < 0)
 975                 return ret;
 976         ret = checkintf(ps, ret);
 977         if (ret)
 978                 return ret;
 979         if (ep & USB_DIR_IN)
 980                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 981         else
 982                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 983
 984         return usb_clear_halt(ps->dev, pipe);
 985 }
 986
 987 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 988 {
 989         struct usbdevfs_getdriver gd;
 990         struct usb_interface *intf;
 991         int ret;
 992
 993         if (copy_from_user(&gd, arg, sizeof(gd)))
 994                 return -EFAULT;
 995         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 996         if (!intf || !intf->dev.driver)
 997                 ret = -ENODATA;
 998         else {
 999                 strncpy(gd.driver, intf->dev.driver->name,
1000                                 sizeof(gd.driver));
1001                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1002         }
1003         return ret;
1004 }
1005
1006 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
1007 {
1008         struct usbdevfs_connectinfo ci;
1009
1010         memset(&ci, 0, sizeof(ci));
1011         ci.devnum = ps->dev->devnum;
1012         ci.slow = ps->dev->speed == USB_SPEED_LOW;
1013
1014         if (copy_to_user(arg, &ci, sizeof(ci)))
1015                 return -EFAULT;
1016         return 0;
1017 }
1018
1019 static int proc_resetdevice(struct dev_state *ps)
1020 {
1021         return usb_reset_device(ps->dev);
1022 }
1023
1024 static int proc_setintf(struct dev_state *ps, void __user *arg)
1025 {
1026         struct usbdevfs_setinterface setintf;
1027         int ret;
1028
1029         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1030                 return -EFAULT;
1031         if ((ret = checkintf(ps, setintf.interface)))
1032                 return ret;
1033         return usb_set_interface(ps->dev, setintf.interface,
1034                         setintf.altsetting);
1035 }
1036
1037 static int proc_setconfig(struct dev_state *ps, void __user *arg)
1038 {
1039         int u;
1040         int status = 0;
1041         struct usb_host_config *actconfig;
1042
1043         if (get_user(u, (int __user *)arg))
1044                 return -EFAULT;
1045
1046         actconfig = ps->dev->actconfig;
1047
1048         /* Don't touch the device if any interfaces are claimed.
1049          * It could interfere with other drivers' operations, and if
1050          * an interface is claimed by usbfs it could easily deadlock.
1051          */
1052         if (actconfig) {
1053                 int i;
1054
1055                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1056                         if (usb_interface_claimed(actconfig->interface[i])) {
1057                                 dev_warn(&ps->dev->dev,
1058                                         "usbfs: interface %d claimed by %s "
1059                                         "while '%s' sets config #%d\n",
1060                                         actconfig->interface[i]
1061                                                 ->cur_altsetting
1062                                                 ->desc.bInterfaceNumber,
1063                                         actconfig->interface[i]
1064                                                 ->dev.driver->name,
1065                                         current->comm, u);
1066                                 status = -EBUSY;
1067                                 break;
1068                         }
1069                 }
1070         }
1071
1072         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1073          * so avoid usb_set_configuration()'s kick to sysfs
1074          */
1075         if (status == 0) {
1076                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1077                         status = usb_reset_configuration(ps->dev);
1078                 else
1079                         status = usb_set_configuration(ps->dev, u);
1080         }
1081
1082         return status;
1083 }
1084
1085 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1086                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1087                         void __user *arg)
1088 {
1089         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1090         struct usb_host_endpoint *ep;
1091         struct async *as;
1092         struct usb_ctrlrequest *dr = NULL;
1093         unsigned int u, totlen, isofrmlen;
1094         int ret, ifnum = -1;
1095         int is_in;
1096
1097         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1098                                 USBDEVFS_URB_SHORT_NOT_OK |
1099                                 USBDEVFS_URB_BULK_CONTINUATION |
1100                                 USBDEVFS_URB_NO_FSBR |
1101                                 USBDEVFS_URB_ZERO_PACKET |
1102                                 USBDEVFS_URB_NO_INTERRUPT))
1103                 return -EINVAL;
1104         if (uurb->buffer_length > 0 && !uurb->buffer)
1105                 return -EINVAL;
1106         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1107             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1108                 ifnum = findintfep(ps->dev, uurb->endpoint);
1109                 if (ifnum < 0)
1110                         return ifnum;
1111                 ret = checkintf(ps, ifnum);
1112                 if (ret)
1113                         return ret;
1114         }
1115         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1116                 is_in = 1;
1117                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1118         } else {
1119                 is_in = 0;
1120                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1121         }
1122         if (!ep)
1123                 return -ENOENT;
1124         switch(uurb->type) {
1125         case USBDEVFS_URB_TYPE_CONTROL:
1126                 if (!usb_endpoint_xfer_control(&ep->desc))
1127                         return -EINVAL;
1128                 /* min 8 byte setup packet,
1129                  * max 8 byte setup plus an arbitrary data stage */
1130                 if (uurb->buffer_length < 8 ||
1131                     uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1132                         return -EINVAL;
1133                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1134                 if (!dr)
1135                         return -ENOMEM;
1136                 if (copy_from_user(dr, uurb->buffer, 8)) {
1137                         kfree(dr);
1138                         return -EFAULT;
1139                 }
1140                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1141                         kfree(dr);
1142                         return -EINVAL;
1143                 }
1144                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1145                                       le16_to_cpup(&dr->wIndex));
1146                 if (ret) {
1147                         kfree(dr);
1148                         return ret;
1149                 }
1150                 uurb->number_of_packets = 0;
1151                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1152                 uurb->buffer += 8;
1153                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1154                         is_in = 1;
1155                         uurb->endpoint |= USB_DIR_IN;
1156                 } else {
1157                         is_in = 0;
1158                         uurb->endpoint &= ~USB_DIR_IN;
1159                 }
1160                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1161                         "bRequest=%02x wValue=%04x "
1162                         "wIndex=%04x wLength=%04x\n",
1163                         dr->bRequestType, dr->bRequest,
1164                         __le16_to_cpup(&dr->wValue),
1165                         __le16_to_cpup(&dr->wIndex),
1166                         __le16_to_cpup(&dr->wLength));
1167                 break;
1168
1169         case USBDEVFS_URB_TYPE_BULK:
1170                 switch (usb_endpoint_type(&ep->desc)) {
1171                 case USB_ENDPOINT_XFER_CONTROL:
1172                 case USB_ENDPOINT_XFER_ISOC:
1173                         return -EINVAL;
1174                 case USB_ENDPOINT_XFER_INT:
1175                         /* allow single-shot interrupt transfers */
1176                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1177                         goto interrupt_urb;
1178                 }
1179                 uurb->number_of_packets = 0;
1180                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1181                         return -EINVAL;
1182                 break;
1183
1184         case USBDEVFS_URB_TYPE_INTERRUPT:
1185                 if (!usb_endpoint_xfer_int(&ep->desc))
1186                         return -EINVAL;
1187  interrupt_urb:
1188                 uurb->number_of_packets = 0;
1189                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1190                         return -EINVAL;
1191                 break;
1192
1193         case USBDEVFS_URB_TYPE_ISO:
1194                 /* arbitrary limit */
1195                 if (uurb->number_of_packets < 1 ||
1196                     uurb->number_of_packets > 128)
1197                         return -EINVAL;
1198                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1199                         return -EINVAL;
1200                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1201                                    uurb->number_of_packets;
1202                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1203                         return -ENOMEM;
1204                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1205                         kfree(isopkt);
1206                         return -EFAULT;
1207                 }
1208                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1209                         /* arbitrary limit,
1210                          * sufficient for USB 2.0 high-bandwidth iso */
1211                         if (isopkt[u].length > 8192) {
1212                                 kfree(isopkt);
1213                                 return -EINVAL;
1214                         }
1215                         totlen += isopkt[u].length;
1216                 }
1217                 /* 3072 * 64 microframes */
1218                 if (totlen > 196608) {
1219                         kfree(isopkt);
1220                         return -EINVAL;
1221                 }
1222                 uurb->buffer_length = totlen;
1223                 break;
1224
1225         default:
1226                 return -EINVAL;
1227         }
1228         if (uurb->buffer_length > 0 &&
1229                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1230                                 uurb->buffer, uurb->buffer_length)) {
1231                 kfree(isopkt);
1232                 kfree(dr);
1233                 return -EFAULT;
1234         }
1235         as = alloc_async(uurb->number_of_packets);
1236         if (!as) {
1237                 kfree(isopkt);
1238                 kfree(dr);
1239                 return -ENOMEM;
1240         }
1241         if (uurb->buffer_length > 0) {
1242                 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1243                                 GFP_KERNEL);
1244                 if (!as->urb->transfer_buffer) {
1245                         kfree(isopkt);
1246                         kfree(dr);
1247                         free_async(as);
1248                         return -ENOMEM;
1249                 }
1250                 /* Isochronous input data may end up being discontiguous
1251                  * if some of the packets are short.  Clear the buffer so
1252                  * that the gaps don't leak kernel data to userspace.
1253                  */
1254                 if (is_in && uurb->type == USBDEVFS_URB_TYPE_ISO)
1255                         memset(as->urb->transfer_buffer, 0,
1256                                         uurb->buffer_length);
1257         }
1258         as->urb->dev = ps->dev;
1259         as->urb->pipe = (uurb->type << 30) |
1260                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1261                         (uurb->endpoint & USB_DIR_IN);
1262
1263         /* This tedious sequence is necessary because the URB_* flags
1264          * are internal to the kernel and subject to change, whereas
1265          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1266          */
1267         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1268         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1269                 u |= URB_ISO_ASAP;
1270         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1271                 u |= URB_SHORT_NOT_OK;
1272         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1273                 u |= URB_NO_FSBR;
1274         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1275                 u |= URB_ZERO_PACKET;
1276         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1277                 u |= URB_NO_INTERRUPT;
1278         as->urb->transfer_flags = u;
1279
1280         as->urb->transfer_buffer_length = uurb->buffer_length;
1281         as->urb->setup_packet = (unsigned char *)dr;
1282         as->urb->start_frame = uurb->start_frame;
1283         as->urb->number_of_packets = uurb->number_of_packets;
1284
1285         if (ep->desc.bInterval) {
1286                 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1287                                 ps->dev->speed == USB_SPEED_HIGH ||
1288                                 ps->dev->speed >= USB_SPEED_SUPER)
1289                         as->urb->interval = 1 <<
1290                                         min(15, ep->desc.bInterval - 1);
1291                 else
1292                         as->urb->interval = ep->desc.bInterval;
1293         }
1294
1295         as->urb->context = as;
1296         as->urb->complete = async_completed;
1297         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1298                 as->urb->iso_frame_desc[u].offset = totlen;
1299                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1300                 totlen += isopkt[u].length;
1301         }
1302         kfree(isopkt);
1303         as->ps = ps;
1304         as->userurb = arg;
1305         if (is_in && uurb->buffer_length > 0)
1306                 as->userbuffer = uurb->buffer;
1307         else
1308                 as->userbuffer = NULL;
1309         as->signr = uurb->signr;
1310         as->ifnum = ifnum;
1311         as->pid = get_pid(task_pid(current));
1312         as->cred = get_current_cred();
1313         security_task_getsecid(current, &as->secid);
1314         if (!is_in && uurb->buffer_length > 0) {
1315                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1316                                 uurb->buffer_length)) {
1317                         free_async(as);
1318                         return -EFAULT;
1319                 }
1320         }
1321         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1322                         as->urb->transfer_buffer_length, 0, SUBMIT,
1323                         is_in ? NULL : as->urb->transfer_buffer,
1324                                 uurb->buffer_length);
1325         async_newpending(as);
1326
1327         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1328                 spin_lock_irq(&ps->lock);
1329
1330                 /* Not exactly the endpoint address; the direction bit is
1331                  * shifted to the 0x10 position so that the value will be
1332                  * between 0 and 31.
1333                  */
1334                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1335                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1336                                 >> 3);
1337
1338                 /* If this bulk URB is the start of a new transfer, re-enable
1339                  * the endpoint.  Otherwise mark it as a continuation URB.
1340                  */
1341                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1342                         as->bulk_status = AS_CONTINUATION;
1343                 else
1344                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1345
1346                 /* Don't accept continuation URBs if the endpoint is
1347                  * disabled because of an earlier error.
1348                  */
1349                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1350                         ret = -EREMOTEIO;
1351                 else
1352                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1353                 spin_unlock_irq(&ps->lock);
1354         } else {
1355                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1356         }
1357
1358         if (ret) {
1359                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1360                            "usbfs: usb_submit_urb returned %d\n", ret);
1361                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1362                                 0, ret, COMPLETE, NULL, 0);
1363                 async_removepending(as);
1364                 free_async(as);
1365                 return ret;
1366         }
1367         return 0;
1368 }
1369
1370 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1371 {
1372         struct usbdevfs_urb uurb;
1373
1374         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1375                 return -EFAULT;
1376
1377         return proc_do_submiturb(ps, &uurb,
1378                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1379                         arg);
1380 }
1381
1382 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1383 {
1384         struct urb *urb;
1385         struct async *as;
1386         unsigned long flags;
1387
1388         spin_lock_irqsave(&ps->lock, flags);
1389         as = async_getpending(ps, arg);
1390         if (!as) {
1391                 spin_unlock_irqrestore(&ps->lock, flags);
1392                 return -EINVAL;
1393         }
1394
1395         urb = as->urb;
1396         usb_get_urb(urb);
1397         spin_unlock_irqrestore(&ps->lock, flags);
1398
1399         usb_kill_urb(urb);
1400         usb_put_urb(urb);
1401
1402         return 0;
1403 }
1404
1405 static int processcompl(struct async *as, void __user * __user *arg)
1406 {
1407         struct urb *urb = as->urb;
1408         struct usbdevfs_urb __user *userurb = as->userurb;
1409         void __user *addr = as->userurb;
1410         unsigned int i;
1411
1412         if (as->userbuffer && urb->actual_length) {
1413                 if (urb->number_of_packets > 0)         /* Isochronous */
1414                         i = urb->transfer_buffer_length;
1415                 else                                    /* Non-Isoc */
1416                         i = urb->actual_length;
1417                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, i))
1418                         goto err_out;
1419         }
1420         if (put_user(as->status, &userurb->status))
1421                 goto err_out;
1422         if (put_user(urb->actual_length, &userurb->actual_length))
1423                 goto err_out;
1424         if (put_user(urb->error_count, &userurb->error_count))
1425                 goto err_out;
1426
1427         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1428                 for (i = 0; i < urb->number_of_packets; i++) {
1429                         if (put_user(urb->iso_frame_desc[i].actual_length,
1430                                      &userurb->iso_frame_desc[i].actual_length))
1431                                 goto err_out;
1432                         if (put_user(urb->iso_frame_desc[i].status,
1433                                      &userurb->iso_frame_desc[i].status))
1434                                 goto err_out;
1435                 }
1436         }
1437
1438         if (put_user(addr, (void __user * __user *)arg))
1439                 return -EFAULT;
1440         return 0;
1441
1442 err_out:
1443         return -EFAULT;
1444 }
1445
1446 static struct async *reap_as(struct dev_state *ps)
1447 {
1448         DECLARE_WAITQUEUE(wait, current);
1449         struct async *as = NULL;
1450         struct usb_device *dev = ps->dev;
1451
1452         add_wait_queue(&ps->wait, &wait);
1453         for (;;) {
1454                 __set_current_state(TASK_INTERRUPTIBLE);
1455                 as = async_getcompleted(ps);
1456                 if (as)
1457                         break;
1458                 if (signal_pending(current))
1459                         break;
1460                 usb_unlock_device(dev);
1461                 schedule();
1462                 usb_lock_device(dev);
1463         }
1464         remove_wait_queue(&ps->wait, &wait);
1465         set_current_state(TASK_RUNNING);
1466         return as;
1467 }
1468
1469 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1470 {
1471         struct async *as = reap_as(ps);
1472         if (as) {
1473                 int retval = processcompl(as, (void __user * __user *)arg);
1474                 free_async(as);
1475                 return retval;
1476         }
1477         if (signal_pending(current))
1478                 return -EINTR;
1479         return -EIO;
1480 }
1481
1482 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1483 {
1484         int retval;
1485         struct async *as;
1486
1487         as = async_getcompleted(ps);
1488         retval = -EAGAIN;
1489         if (as) {
1490                 retval = processcompl(as, (void __user * __user *)arg);
1491                 free_async(as);
1492         }
1493         return retval;
1494 }
1495
1496 #ifdef CONFIG_COMPAT
1497 static int proc_control_compat(struct dev_state *ps,
1498                                 struct usbdevfs_ctrltransfer32 __user *p32)
1499 {
1500         struct usbdevfs_ctrltransfer __user *p;
1501         __u32 udata;
1502         p = compat_alloc_user_space(sizeof(*p));
1503         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1504             get_user(udata, &p32->data) ||
1505             put_user(compat_ptr(udata), &p->data))
1506                 return -EFAULT;
1507         return proc_control(ps, p);
1508 }
1509
1510 static int proc_bulk_compat(struct dev_state *ps,
1511                         struct usbdevfs_bulktransfer32 __user *p32)
1512 {
1513         struct usbdevfs_bulktransfer __user *p;
1514         compat_uint_t n;
1515         compat_caddr_t addr;
1516
1517         p = compat_alloc_user_space(sizeof(*p));
1518
1519         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1520             get_user(n, &p32->len) || put_user(n, &p->len) ||
1521             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1522             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1523                 return -EFAULT;
1524
1525         return proc_bulk(ps, p);
1526 }
1527 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1528 {
1529         struct usbdevfs_disconnectsignal32 ds;
1530
1531         if (copy_from_user(&ds, arg, sizeof(ds)))
1532                 return -EFAULT;
1533         ps->discsignr = ds.signr;
1534         ps->disccontext = compat_ptr(ds.context);
1535         return 0;
1536 }
1537
1538 static int get_urb32(struct usbdevfs_urb *kurb,
1539                      struct usbdevfs_urb32 __user *uurb)
1540 {
1541         __u32  uptr;
1542         if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1543             __get_user(kurb->type, &uurb->type) ||
1544             __get_user(kurb->endpoint, &uurb->endpoint) ||
1545             __get_user(kurb->status, &uurb->status) ||
1546             __get_user(kurb->flags, &uurb->flags) ||
1547             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1548             __get_user(kurb->actual_length, &uurb->actual_length) ||
1549             __get_user(kurb->start_frame, &uurb->start_frame) ||
1550             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1551             __get_user(kurb->error_count, &uurb->error_count) ||
1552             __get_user(kurb->signr, &uurb->signr))
1553                 return -EFAULT;
1554
1555         if (__get_user(uptr, &uurb->buffer))
1556                 return -EFAULT;
1557         kurb->buffer = compat_ptr(uptr);
1558         if (__get_user(uptr, &uurb->usercontext))
1559                 return -EFAULT;
1560         kurb->usercontext = compat_ptr(uptr);
1561
1562         return 0;
1563 }
1564
1565 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1566 {
1567         struct usbdevfs_urb uurb;
1568
1569         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1570                 return -EFAULT;
1571
1572         return proc_do_submiturb(ps, &uurb,
1573                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1574                         arg);
1575 }
1576
1577 static int processcompl_compat(struct async *as, void __user * __user *arg)
1578 {
1579         struct urb *urb = as->urb;
1580         struct usbdevfs_urb32 __user *userurb = as->userurb;
1581         void __user *addr = as->userurb;
1582         unsigned int i;
1583
1584         if (as->userbuffer && urb->actual_length) {
1585                 if (urb->number_of_packets > 0)         /* Isochronous */
1586                         i = urb->transfer_buffer_length;
1587                 else                                    /* Non-Isoc */
1588                         i = urb->actual_length;
1589                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, i))
1590                         return -EFAULT;
1591         }
1592         if (put_user(as->status, &userurb->status))
1593                 return -EFAULT;
1594         if (put_user(urb->actual_length, &userurb->actual_length))
1595                 return -EFAULT;
1596         if (put_user(urb->error_count, &userurb->error_count))
1597                 return -EFAULT;
1598
1599         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1600                 for (i = 0; i < urb->number_of_packets; i++) {
1601                         if (put_user(urb->iso_frame_desc[i].actual_length,
1602                                      &userurb->iso_frame_desc[i].actual_length))
1603                                 return -EFAULT;
1604                         if (put_user(urb->iso_frame_desc[i].status,
1605                                      &userurb->iso_frame_desc[i].status))
1606                                 return -EFAULT;
1607                 }
1608         }
1609
1610         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1611                 return -EFAULT;
1612         return 0;
1613 }
1614
1615 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1616 {
1617         struct async *as = reap_as(ps);
1618         if (as) {
1619                 int retval = processcompl_compat(as, (void __user * __user *)arg);
1620                 free_async(as);
1621                 return retval;
1622         }
1623         if (signal_pending(current))
1624                 return -EINTR;
1625         return -EIO;
1626 }
1627
1628 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1629 {
1630         int retval;
1631         struct async *as;
1632
1633         retval = -EAGAIN;
1634         as = async_getcompleted(ps);
1635         if (as) {
1636                 retval = processcompl_compat(as, (void __user * __user *)arg);
1637                 free_async(as);
1638         }
1639         return retval;
1640 }
1641
1642
1643 #endif
1644
1645 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1646 {
1647         struct usbdevfs_disconnectsignal ds;
1648
1649         if (copy_from_user(&ds, arg, sizeof(ds)))
1650                 return -EFAULT;
1651         ps->discsignr = ds.signr;
1652         ps->disccontext = ds.context;
1653         return 0;
1654 }
1655
1656 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1657 {
1658         unsigned int ifnum;
1659
1660         if (get_user(ifnum, (unsigned int __user *)arg))
1661                 return -EFAULT;
1662         return claimintf(ps, ifnum);
1663 }
1664
1665 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1666 {
1667         unsigned int ifnum;
1668         int ret;
1669
1670         if (get_user(ifnum, (unsigned int __user *)arg))
1671                 return -EFAULT;
1672         if ((ret = releaseintf(ps, ifnum)) < 0)
1673                 return ret;
1674         destroy_async_on_interface (ps, ifnum);
1675         return 0;
1676 }
1677
1678 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1679 {
1680         int                     size;
1681         void                    *buf = NULL;
1682         int                     retval = 0;
1683         struct usb_interface    *intf = NULL;
1684         struct usb_driver       *driver = NULL;
1685
1686         /* alloc buffer */
1687         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1688                 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1689                         return -ENOMEM;
1690                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1691                         if (copy_from_user(buf, ctl->data, size)) {
1692                                 kfree(buf);
1693                                 return -EFAULT;
1694                         }
1695                 } else {
1696                         memset(buf, 0, size);
1697                 }
1698         }
1699
1700         if (!connected(ps)) {
1701                 kfree(buf);
1702                 return -ENODEV;
1703         }
1704
1705         if (ps->dev->state != USB_STATE_CONFIGURED)
1706                 retval = -EHOSTUNREACH;
1707         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1708                 retval = -EINVAL;
1709         else switch (ctl->ioctl_code) {
1710
1711         /* disconnect kernel driver from interface */
1712         case USBDEVFS_DISCONNECT:
1713                 if (intf->dev.driver) {
1714                         driver = to_usb_driver(intf->dev.driver);
1715                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1716                         usb_driver_release_interface(driver, intf);
1717                 } else
1718                         retval = -ENODATA;
1719                 break;
1720
1721         /* let kernel drivers try to (re)bind to the interface */
1722         case USBDEVFS_CONNECT:
1723                 if (!intf->dev.driver)
1724                         retval = device_attach(&intf->dev);
1725                 else
1726                         retval = -EBUSY;
1727                 break;
1728
1729         /* talk directly to the interface's driver */
1730         default:
1731                 if (intf->dev.driver)
1732                         driver = to_usb_driver(intf->dev.driver);
1733                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1734                         retval = -ENOTTY;
1735                 } else {
1736                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1737                         if (retval == -ENOIOCTLCMD)
1738                                 retval = -ENOTTY;
1739                 }
1740         }
1741
1742         /* cleanup and return */
1743         if (retval >= 0
1744                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1745                         && size > 0
1746                         && copy_to_user(ctl->data, buf, size) != 0)
1747                 retval = -EFAULT;
1748
1749         kfree(buf);
1750         return retval;
1751 }
1752
1753 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1754 {
1755         struct usbdevfs_ioctl   ctrl;
1756
1757         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1758                 return -EFAULT;
1759         return proc_ioctl(ps, &ctrl);
1760 }
1761
1762 #ifdef CONFIG_COMPAT
1763 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1764 {
1765         struct usbdevfs_ioctl32 __user *uioc;
1766         struct usbdevfs_ioctl ctrl;
1767         u32 udata;
1768
1769         uioc = compat_ptr((long)arg);
1770         if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1771             __get_user(ctrl.ifno, &uioc->ifno) ||
1772             __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1773             __get_user(udata, &uioc->data))
1774                 return -EFAULT;
1775         ctrl.data = compat_ptr(udata);
1776
1777         return proc_ioctl(ps, &ctrl);
1778 }
1779 #endif
1780
1781 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1782 {
1783         unsigned portnum;
1784         int rc;
1785
1786         if (get_user(portnum, (unsigned __user *) arg))
1787                 return -EFAULT;
1788         rc = usb_hub_claim_port(ps->dev, portnum, ps);
1789         if (rc == 0)
1790                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1791                         portnum, task_pid_nr(current), current->comm);
1792         return rc;
1793 }
1794
1795 static int proc_release_port(struct dev_state *ps, void __user *arg)
1796 {
1797         unsigned portnum;
1798
1799         if (get_user(portnum, (unsigned __user *) arg))
1800                 return -EFAULT;
1801         return usb_hub_release_port(ps->dev, portnum, ps);
1802 }
1803
1804 /*
1805  * NOTE:  All requests here that have interface numbers as parameters
1806  * are assuming that somehow the configuration has been prevented from
1807  * changing.  But there's no mechanism to ensure that...
1808  */
1809 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1810                                 void __user *p)
1811 {
1812         struct dev_state *ps = file->private_data;
1813         struct inode *inode = file->f_path.dentry->d_inode;
1814         struct usb_device *dev = ps->dev;
1815         int ret = -ENOTTY;
1816
1817         if (!(file->f_mode & FMODE_WRITE))
1818                 return -EPERM;
1819
1820         usb_lock_device(dev);
1821         if (!connected(ps)) {
1822                 usb_unlock_device(dev);
1823                 return -ENODEV;
1824         }
1825
1826         switch (cmd) {
1827         case USBDEVFS_CONTROL:
1828                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1829                 ret = proc_control(ps, p);
1830                 if (ret >= 0)
1831                         inode->i_mtime = CURRENT_TIME;
1832                 break;
1833
1834         case USBDEVFS_BULK:
1835                 snoop(&dev->dev, "%s: BULK\n", __func__);
1836                 ret = proc_bulk(ps, p);
1837                 if (ret >= 0)
1838                         inode->i_mtime = CURRENT_TIME;
1839                 break;
1840
1841         case USBDEVFS_RESETEP:
1842                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1843                 ret = proc_resetep(ps, p);
1844                 if (ret >= 0)
1845                         inode->i_mtime = CURRENT_TIME;
1846                 break;
1847
1848         case USBDEVFS_RESET:
1849                 snoop(&dev->dev, "%s: RESET\n", __func__);
1850                 ret = proc_resetdevice(ps);
1851                 break;
1852
1853         case USBDEVFS_CLEAR_HALT:
1854                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1855                 ret = proc_clearhalt(ps, p);
1856                 if (ret >= 0)
1857                         inode->i_mtime = CURRENT_TIME;
1858                 break;
1859
1860         case USBDEVFS_GETDRIVER:
1861                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1862                 ret = proc_getdriver(ps, p);
1863                 break;
1864
1865         case USBDEVFS_CONNECTINFO:
1866                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1867                 ret = proc_connectinfo(ps, p);
1868                 break;
1869
1870         case USBDEVFS_SETINTERFACE:
1871                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1872                 ret = proc_setintf(ps, p);
1873                 break;
1874
1875         case USBDEVFS_SETCONFIGURATION:
1876                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1877                 ret = proc_setconfig(ps, p);
1878                 break;
1879
1880         case USBDEVFS_SUBMITURB:
1881                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1882                 ret = proc_submiturb(ps, p);
1883                 if (ret >= 0)
1884                         inode->i_mtime = CURRENT_TIME;
1885                 break;
1886
1887 #ifdef CONFIG_COMPAT
1888         case USBDEVFS_CONTROL32:
1889                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
1890                 ret = proc_control_compat(ps, p);
1891                 if (ret >= 0)
1892                         inode->i_mtime = CURRENT_TIME;
1893                 break;
1894
1895         case USBDEVFS_BULK32:
1896                 snoop(&dev->dev, "%s: BULK32\n", __func__);
1897                 ret = proc_bulk_compat(ps, p);
1898                 if (ret >= 0)
1899                         inode->i_mtime = CURRENT_TIME;
1900                 break;
1901
1902         case USBDEVFS_DISCSIGNAL32:
1903                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
1904                 ret = proc_disconnectsignal_compat(ps, p);
1905                 break;
1906
1907         case USBDEVFS_SUBMITURB32:
1908                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1909                 ret = proc_submiturb_compat(ps, p);
1910                 if (ret >= 0)
1911                         inode->i_mtime = CURRENT_TIME;
1912                 break;
1913
1914         case USBDEVFS_REAPURB32:
1915                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1916                 ret = proc_reapurb_compat(ps, p);
1917                 break;
1918
1919         case USBDEVFS_REAPURBNDELAY32:
1920                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
1921                 ret = proc_reapurbnonblock_compat(ps, p);
1922                 break;
1923
1924         case USBDEVFS_IOCTL32:
1925                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
1926                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1927                 break;
1928 #endif
1929
1930         case USBDEVFS_DISCARDURB:
1931                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1932                 ret = proc_unlinkurb(ps, p);
1933                 break;
1934
1935         case USBDEVFS_REAPURB:
1936                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1937                 ret = proc_reapurb(ps, p);
1938                 break;
1939
1940         case USBDEVFS_REAPURBNDELAY:
1941                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
1942                 ret = proc_reapurbnonblock(ps, p);
1943                 break;
1944
1945         case USBDEVFS_DISCSIGNAL:
1946                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1947                 ret = proc_disconnectsignal(ps, p);
1948                 break;
1949
1950         case USBDEVFS_CLAIMINTERFACE:
1951                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1952                 ret = proc_claiminterface(ps, p);
1953                 break;
1954
1955         case USBDEVFS_RELEASEINTERFACE:
1956                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1957                 ret = proc_releaseinterface(ps, p);
1958                 break;
1959
1960         case USBDEVFS_IOCTL:
1961                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1962                 ret = proc_ioctl_default(ps, p);
1963                 break;
1964
1965         case USBDEVFS_CLAIM_PORT:
1966                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
1967                 ret = proc_claim_port(ps, p);
1968                 break;
1969
1970         case USBDEVFS_RELEASE_PORT:
1971                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
1972                 ret = proc_release_port(ps, p);
1973                 break;
1974         }
1975         usb_unlock_device(dev);
1976         if (ret >= 0)
1977                 inode->i_atime = CURRENT_TIME;
1978         return ret;
1979 }
1980
1981 static long usbdev_ioctl(struct file *file, unsigned int cmd,
1982                         unsigned long arg)
1983 {
1984         int ret;
1985
1986         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
1987
1988         return ret;
1989 }
1990
1991 #ifdef CONFIG_COMPAT
1992 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
1993                         unsigned long arg)
1994 {
1995         int ret;
1996
1997         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
1998
1999         return ret;
2000 }
2001 #endif
2002
2003 /* No kernel lock - fine */
2004 static unsigned int usbdev_poll(struct file *file,
2005                                 struct poll_table_struct *wait)
2006 {
2007         struct dev_state *ps = file->private_data;
2008         unsigned int mask = 0;
2009
2010         poll_wait(file, &ps->wait, wait);
2011         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2012                 mask |= POLLOUT | POLLWRNORM;
2013         if (!connected(ps))
2014                 mask |= POLLERR | POLLHUP;
2015         return mask;
2016 }
2017
2018 const struct file_operations usbdev_file_operations = {
2019         .owner =          THIS_MODULE,
2020         .llseek =         usbdev_lseek,
2021         .read =           usbdev_read,
2022         .poll =           usbdev_poll,
2023         .unlocked_ioctl = usbdev_ioctl,
2024 #ifdef CONFIG_COMPAT
2025         .compat_ioctl =   usbdev_compat_ioctl,
2026 #endif
2027         .open =           usbdev_open,
2028         .release =        usbdev_release,
2029 };
2030
2031 static void usbdev_remove(struct usb_device *udev)
2032 {
2033         struct dev_state *ps;
2034         struct siginfo sinfo;
2035
2036         while (!list_empty(&udev->filelist)) {
2037                 ps = list_entry(udev->filelist.next, struct dev_state, list);
2038                 destroy_all_async(ps);
2039                 wake_up_all(&ps->wait);
2040                 list_del_init(&ps->list);
2041                 if (ps->discsignr) {
2042                         memset(&sinfo, 0, sizeof(sinfo));
2043                         sinfo.si_signo = ps->discsignr;
2044                         sinfo.si_errno = EPIPE;
2045                         sinfo.si_code = SI_ASYNCIO;
2046                         sinfo.si_addr = ps->disccontext;
2047                         kill_pid_info_as_cred(ps->discsignr, &sinfo,
2048                                         ps->disc_pid, ps->cred, ps->secid);
2049                 }
2050         }
2051 }
2052
2053 #ifdef CONFIG_USB_DEVICE_CLASS
2054 static struct class *usb_classdev_class;
2055
2056 static int usb_classdev_add(struct usb_device *dev)
2057 {
2058         struct device *cldev;
2059
2060         cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
2061                               NULL, "usbdev%d.%d", dev->bus->busnum,
2062                               dev->devnum);
2063         if (IS_ERR(cldev))
2064                 return PTR_ERR(cldev);
2065         dev->usb_classdev = cldev;
2066         return 0;
2067 }
2068
2069 static void usb_classdev_remove(struct usb_device *dev)
2070 {
2071         if (dev->usb_classdev)
2072                 device_unregister(dev->usb_classdev);
2073 }
2074
2075 #else
2076 #define usb_classdev_add(dev)           0
2077 #define usb_classdev_remove(dev)        do {} while (0)
2078
2079 #endif
2080
2081 static int usbdev_notify(struct notifier_block *self,
2082                                unsigned long action, void *dev)
2083 {
2084         switch (action) {
2085         case USB_DEVICE_ADD:
2086                 if (usb_classdev_add(dev))
2087                         return NOTIFY_BAD;
2088                 break;
2089         case USB_DEVICE_REMOVE:
2090                 usb_classdev_remove(dev);
2091                 usbdev_remove(dev);
2092                 break;
2093         }
2094         return NOTIFY_OK;
2095 }
2096
2097 static struct notifier_block usbdev_nb = {
2098         .notifier_call =        usbdev_notify,
2099 };
2100
2101 static struct cdev usb_device_cdev;
2102
2103 int __init usb_devio_init(void)
2104 {
2105         int retval;
2106
2107         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2108                                         "usb_device");
2109         if (retval) {
2110                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2111                 goto out;
2112         }
2113         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2114         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2115         if (retval) {
2116                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2117                        USB_DEVICE_MAJOR);
2118                 goto error_cdev;
2119         }
2120 #ifdef CONFIG_USB_DEVICE_CLASS
2121         usb_classdev_class = class_create(THIS_MODULE, "usb_device");
2122         if (IS_ERR(usb_classdev_class)) {
2123                 printk(KERN_ERR "Unable to register usb_device class\n");
2124                 retval = PTR_ERR(usb_classdev_class);
2125                 cdev_del(&usb_device_cdev);
2126                 usb_classdev_class = NULL;
2127                 goto out;
2128         }
2129         /* devices of this class shadow the major:minor of their parent
2130          * device, so clear ->dev_kobj to prevent adding duplicate entries
2131          * to /sys/dev
2132          */
2133         usb_classdev_class->dev_kobj = NULL;
2134 #endif
2135         usb_register_notify(&usbdev_nb);
2136 out:
2137         return retval;
2138
2139 error_cdev:
2140         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2141         goto out;
2142 }
2143
2144 void usb_devio_cleanup(void)
2145 {
2146         usb_unregister_notify(&usbdev_nb);
2147 #ifdef CONFIG_USB_DEVICE_CLASS
2148         class_destroy(usb_classdev_class);
2149 #endif
2150         cdev_del(&usb_device_cdev);
2151         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2152 }