git.oblomov.eu Git - linux-2.6/blob - 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/smp_lock.h>
  41 #include <linux/signal.h>
  42 #include <linux/poll.h>
  43 #include <linux/module.h>
  44 #include <linux/usb.h>
  45 #include <linux/usbdevice_fs.h>
  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 "hcd.h"        /* for usbcore internals */
  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         uid_t disc_uid, disc_euid;
  73         void __user *disccontext;
  74         unsigned long ifclaimed;
  75         u32 secid;
  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 };
  91
  92 static int usbfs_snoop;
  93 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  94 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
  95
  96 #define snoop(dev, format, arg...)                              \
  97         do {                                                    \
  98                 if (usbfs_snoop)                                \
  99                         dev_info(dev , format , ## arg);        \
 100         } while (0)
 101
 102 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 103
 104
 105 #define MAX_USBFS_BUFFER_SIZE   16384
 106
 107 static int connected(struct dev_state *ps)
 108 {
 109         return (!list_empty(&ps->list) &&
 110                         ps->dev->state != USB_STATE_NOTATTACHED);
 111 }
 112
 113 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
 114 {
 115         loff_t ret;
 116
 117         lock_kernel();
 118
 119         switch (orig) {
 120         case 0:
 121                 file->f_pos = offset;
 122                 ret = file->f_pos;
 123                 break;
 124         case 1:
 125                 file->f_pos += offset;
 126                 ret = file->f_pos;
 127                 break;
 128         case 2:
 129         default:
 130                 ret = -EINVAL;
 131         }
 132
 133         unlock_kernel();
 134         return ret;
 135 }
 136
 137 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 138                            loff_t *ppos)
 139 {
 140         struct dev_state *ps = file->private_data;
 141         struct usb_device *dev = ps->dev;
 142         ssize_t ret = 0;
 143         unsigned len;
 144         loff_t pos;
 145         int i;
 146
 147         pos = *ppos;
 148         usb_lock_device(dev);
 149         if (!connected(ps)) {
 150                 ret = -ENODEV;
 151                 goto err;
 152         } else if (pos < 0) {
 153                 ret = -EINVAL;
 154                 goto err;
 155         }
 156
 157         if (pos < sizeof(struct usb_device_descriptor)) {
 158                 /* 18 bytes - fits on the stack */
 159                 struct usb_device_descriptor temp_desc;
 160
 161                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 162                 le16_to_cpus(&temp_desc.bcdUSB);
 163                 le16_to_cpus(&temp_desc.idVendor);
 164                 le16_to_cpus(&temp_desc.idProduct);
 165                 le16_to_cpus(&temp_desc.bcdDevice);
 166
 167                 len = sizeof(struct usb_device_descriptor) - pos;
 168                 if (len > nbytes)
 169                         len = nbytes;
 170                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 171                         ret = -EFAULT;
 172                         goto err;
 173                 }
 174
 175                 *ppos += len;
 176                 buf += len;
 177                 nbytes -= len;
 178                 ret += len;
 179         }
 180
 181         pos = sizeof(struct usb_device_descriptor);
 182         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 183                 struct usb_config_descriptor *config =
 184                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 185                 unsigned int length = le16_to_cpu(config->wTotalLength);
 186
 187                 if (*ppos < pos + length) {
 188
 189                         /* The descriptor may claim to be longer than it
 190                          * really is.  Here is the actual allocated length. */
 191                         unsigned alloclen =
 192                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 193
 194                         len = length - (*ppos - pos);
 195                         if (len > nbytes)
 196                                 len = nbytes;
 197
 198                         /* Simply don't write (skip over) unallocated parts */
 199                         if (alloclen > (*ppos - pos)) {
 200                                 alloclen -= (*ppos - pos);
 201                                 if (copy_to_user(buf,
 202                                     dev->rawdescriptors[i] + (*ppos - pos),
 203                                     min(len, alloclen))) {
 204                                         ret = -EFAULT;
 205                                         goto err;
 206                                 }
 207                         }
 208
 209                         *ppos += len;
 210                         buf += len;
 211                         nbytes -= len;
 212                         ret += len;
 213                 }
 214
 215                 pos += length;
 216         }
 217
 218 err:
 219         usb_unlock_device(dev);
 220         return ret;
 221 }
 222
 223 /*
 224  * async list handling
 225  */
 226
 227 static struct async *alloc_async(unsigned int numisoframes)
 228 {
 229         struct async *as;
 230
 231         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 232         if (!as)
 233                 return NULL;
 234         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 235         if (!as->urb) {
 236                 kfree(as);
 237                 return NULL;
 238         }
 239         return as;
 240 }
 241
 242 static void free_async(struct async *as)
 243 {
 244         put_pid(as->pid);
 245         kfree(as->urb->transfer_buffer);
 246         kfree(as->urb->setup_packet);
 247         usb_free_urb(as->urb);
 248         kfree(as);
 249 }
 250
 251 static void async_newpending(struct async *as)
 252 {
 253         struct dev_state *ps = as->ps;
 254         unsigned long flags;
 255
 256         spin_lock_irqsave(&ps->lock, flags);
 257         list_add_tail(&as->asynclist, &ps->async_pending);
 258         spin_unlock_irqrestore(&ps->lock, flags);
 259 }
 260
 261 static void async_removepending(struct async *as)
 262 {
 263         struct dev_state *ps = as->ps;
 264         unsigned long flags;
 265
 266         spin_lock_irqsave(&ps->lock, flags);
 267         list_del_init(&as->asynclist);
 268         spin_unlock_irqrestore(&ps->lock, flags);
 269 }
 270
 271 static struct async *async_getcompleted(struct dev_state *ps)
 272 {
 273         unsigned long flags;
 274         struct async *as = NULL;
 275
 276         spin_lock_irqsave(&ps->lock, flags);
 277         if (!list_empty(&ps->async_completed)) {
 278                 as = list_entry(ps->async_completed.next, struct async,
 279                                 asynclist);
 280                 list_del_init(&as->asynclist);
 281         }
 282         spin_unlock_irqrestore(&ps->lock, flags);
 283         return as;
 284 }
 285
 286 static struct async *async_getpending(struct dev_state *ps,
 287                                              void __user *userurb)
 288 {
 289         unsigned long flags;
 290         struct async *as;
 291
 292         spin_lock_irqsave(&ps->lock, flags);
 293         list_for_each_entry(as, &ps->async_pending, asynclist)
 294                 if (as->userurb == userurb) {
 295                         list_del_init(&as->asynclist);
 296                         spin_unlock_irqrestore(&ps->lock, flags);
 297                         return as;
 298                 }
 299         spin_unlock_irqrestore(&ps->lock, flags);
 300         return NULL;
 301 }
 302
 303 static void snoop_urb(struct urb *urb, void __user *userurb)
 304 {
 305         unsigned j;
 306         unsigned char *data = urb->transfer_buffer;
 307
 308         if (!usbfs_snoop)
 309                 return;
 310
 311         dev_info(&urb->dev->dev, "direction=%s\n",
 312                         usb_urb_dir_in(urb) ? "IN" : "OUT");
 313         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
 314         dev_info(&urb->dev->dev, "transfer_buffer_length=%u\n",
 315                  urb->transfer_buffer_length);
 316         dev_info(&urb->dev->dev, "actual_length=%u\n", urb->actual_length);
 317         dev_info(&urb->dev->dev, "data: ");
 318         for (j = 0; j < urb->transfer_buffer_length; ++j)
 319                 printk("%02x ", data[j]);
 320         printk("\n");
 321 }
 322
 323 static void async_completed(struct urb *urb)
 324 {
 325         struct async *as = urb->context;
 326         struct dev_state *ps = as->ps;
 327         struct siginfo sinfo;
 328
 329         spin_lock(&ps->lock);
 330         list_move_tail(&as->asynclist, &ps->async_completed);
 331         spin_unlock(&ps->lock);
 332         as->status = urb->status;
 333         if (as->signr) {
 334                 sinfo.si_signo = as->signr;
 335                 sinfo.si_errno = as->status;
 336                 sinfo.si_code = SI_ASYNCIO;
 337                 sinfo.si_addr = as->userurb;
 338                 kill_pid_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
 339                                       as->euid, as->secid);
 340         }
 341         snoop(&urb->dev->dev, "urb complete\n");
 342         snoop_urb(urb, as->userurb);
 343         wake_up(&ps->wait);
 344 }
 345
 346 static void destroy_async(struct dev_state *ps, struct list_head *list)
 347 {
 348         struct async *as;
 349         unsigned long flags;
 350
 351         spin_lock_irqsave(&ps->lock, flags);
 352         while (!list_empty(list)) {
 353                 as = list_entry(list->next, struct async, asynclist);
 354                 list_del_init(&as->asynclist);
 355
 356                 /* drop the spinlock so the completion handler can run */
 357                 spin_unlock_irqrestore(&ps->lock, flags);
 358                 usb_kill_urb(as->urb);
 359                 spin_lock_irqsave(&ps->lock, flags);
 360         }
 361         spin_unlock_irqrestore(&ps->lock, flags);
 362 }
 363
 364 static void destroy_async_on_interface(struct dev_state *ps,
 365                                        unsigned int ifnum)
 366 {
 367         struct list_head *p, *q, hitlist;
 368         unsigned long flags;
 369
 370         INIT_LIST_HEAD(&hitlist);
 371         spin_lock_irqsave(&ps->lock, flags);
 372         list_for_each_safe(p, q, &ps->async_pending)
 373                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 374                         list_move_tail(p, &hitlist);
 375         spin_unlock_irqrestore(&ps->lock, flags);
 376         destroy_async(ps, &hitlist);
 377 }
 378
 379 static void destroy_all_async(struct dev_state *ps)
 380 {
 381         destroy_async(ps, &ps->async_pending);
 382 }
 383
 384 /*
 385  * interface claims are made only at the request of user level code,
 386  * which can also release them (explicitly or by closing files).
 387  * they're also undone when devices disconnect.
 388  */
 389
 390 static int driver_probe(struct usb_interface *intf,
 391                         const struct usb_device_id *id)
 392 {
 393         return -ENODEV;
 394 }
 395
 396 static void driver_disconnect(struct usb_interface *intf)
 397 {
 398         struct dev_state *ps = usb_get_intfdata(intf);
 399         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 400
 401         if (!ps)
 402                 return;
 403
 404         /* NOTE:  this relies on usbcore having canceled and completed
 405          * all pending I/O requests; 2.6 does that.
 406          */
 407
 408         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 409                 clear_bit(ifnum, &ps->ifclaimed);
 410         else
 411                 dev_warn(&intf->dev, "interface number %u out of range\n",
 412                          ifnum);
 413
 414         usb_set_intfdata(intf, NULL);
 415
 416         /* force async requests to complete */
 417         destroy_async_on_interface(ps, ifnum);
 418 }
 419
 420 /* The following routines are merely placeholders.  There is no way
 421  * to inform a user task about suspend or resumes.
 422  */
 423 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 424 {
 425         return 0;
 426 }
 427
 428 static int driver_resume(struct usb_interface *intf)
 429 {
 430         return 0;
 431 }
 432
 433 struct usb_driver usbfs_driver = {
 434         .name =         "usbfs",
 435         .probe =        driver_probe,
 436         .disconnect =   driver_disconnect,
 437         .suspend =      driver_suspend,
 438         .resume =       driver_resume,
 439 };
 440
 441 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 442 {
 443         struct usb_device *dev = ps->dev;
 444         struct usb_interface *intf;
 445         int err;
 446
 447         if (ifnum >= 8*sizeof(ps->ifclaimed))
 448                 return -EINVAL;
 449         /* already claimed */
 450         if (test_bit(ifnum, &ps->ifclaimed))
 451                 return 0;
 452
 453         intf = usb_ifnum_to_if(dev, ifnum);
 454         if (!intf)
 455                 err = -ENOENT;
 456         else
 457                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 458         if (err == 0)
 459                 set_bit(ifnum, &ps->ifclaimed);
 460         return err;
 461 }
 462
 463 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 464 {
 465         struct usb_device *dev;
 466         struct usb_interface *intf;
 467         int err;
 468
 469         err = -EINVAL;
 470         if (ifnum >= 8*sizeof(ps->ifclaimed))
 471                 return err;
 472         dev = ps->dev;
 473         intf = usb_ifnum_to_if(dev, ifnum);
 474         if (!intf)
 475                 err = -ENOENT;
 476         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 477                 usb_driver_release_interface(&usbfs_driver, intf);
 478                 err = 0;
 479         }
 480         return err;
 481 }
 482
 483 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 484 {
 485         if (ps->dev->state != USB_STATE_CONFIGURED)
 486                 return -EHOSTUNREACH;
 487         if (ifnum >= 8*sizeof(ps->ifclaimed))
 488                 return -EINVAL;
 489         if (test_bit(ifnum, &ps->ifclaimed))
 490                 return 0;
 491         /* if not yet claimed, claim it for the driver */
 492         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 493                  "interface %u before use\n", task_pid_nr(current),
 494                  current->comm, ifnum);
 495         return claimintf(ps, ifnum);
 496 }
 497
 498 static int findintfep(struct usb_device *dev, unsigned int ep)
 499 {
 500         unsigned int i, j, e;
 501         struct usb_interface *intf;
 502         struct usb_host_interface *alts;
 503         struct usb_endpoint_descriptor *endpt;
 504
 505         if (ep & ~(USB_DIR_IN|0xf))
 506                 return -EINVAL;
 507         if (!dev->actconfig)
 508                 return -ESRCH;
 509         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 510                 intf = dev->actconfig->interface[i];
 511                 for (j = 0; j < intf->num_altsetting; j++) {
 512                         alts = &intf->altsetting[j];
 513                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 514                                 endpt = &alts->endpoint[e].desc;
 515                                 if (endpt->bEndpointAddress == ep)
 516                                         return alts->desc.bInterfaceNumber;
 517                         }
 518                 }
 519         }
 520         return -ENOENT;
 521 }
 522
 523 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
 524                            unsigned int index)
 525 {
 526         int ret = 0;
 527
 528         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 529          && ps->dev->state != USB_STATE_ADDRESS
 530          && ps->dev->state != USB_STATE_CONFIGURED)
 531                 return -EHOSTUNREACH;
 532         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 533                 return 0;
 534
 535         index &= 0xff;
 536         switch (requesttype & USB_RECIP_MASK) {
 537         case USB_RECIP_ENDPOINT:
 538                 ret = findintfep(ps->dev, index);
 539                 if (ret >= 0)
 540                         ret = checkintf(ps, ret);
 541                 break;
 542
 543         case USB_RECIP_INTERFACE:
 544                 ret = checkintf(ps, index);
 545                 break;
 546         }
 547         return ret;
 548 }
 549
 550 static int match_devt(struct device *dev, void *data)
 551 {
 552         return dev->devt == (dev_t) (unsigned long) data;
 553 }
 554
 555 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 556 {
 557         struct device *dev;
 558
 559         dev = bus_find_device(&usb_bus_type, NULL,
 560                               (void *) (unsigned long) devt, match_devt);
 561         if (!dev)
 562                 return NULL;
 563         return container_of(dev, struct usb_device, dev);
 564 }
 565
 566 /*
 567  * file operations
 568  */
 569 static int usbdev_open(struct inode *inode, struct file *file)
 570 {
 571         struct usb_device *dev = NULL;
 572         struct dev_state *ps;
 573         const struct cred *cred = current_cred();
 574         int ret;
 575
 576         lock_kernel();
 577         /* Protect against simultaneous removal or release */
 578         mutex_lock(&usbfs_mutex);
 579
 580         ret = -ENOMEM;
 581         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
 582         if (!ps)
 583                 goto out;
 584
 585         ret = -ENOENT;
 586
 587         /* usbdev device-node */
 588         if (imajor(inode) == USB_DEVICE_MAJOR)
 589                 dev = usbdev_lookup_by_devt(inode->i_rdev);
 590 #ifdef CONFIG_USB_DEVICEFS
 591         /* procfs file */
 592         if (!dev) {
 593                 dev = inode->i_private;
 594                 if (dev && dev->usbfs_dentry &&
 595                                         dev->usbfs_dentry->d_inode == inode)
 596                         usb_get_dev(dev);
 597                 else
 598                         dev = NULL;
 599         }
 600 #endif
 601         if (!dev || dev->state == USB_STATE_NOTATTACHED)
 602                 goto out;
 603         ret = usb_autoresume_device(dev);
 604         if (ret)
 605                 goto out;
 606
 607         ret = 0;
 608         ps->dev = dev;
 609         ps->file = file;
 610         spin_lock_init(&ps->lock);
 611         INIT_LIST_HEAD(&ps->list);
 612         INIT_LIST_HEAD(&ps->async_pending);
 613         INIT_LIST_HEAD(&ps->async_completed);
 614         init_waitqueue_head(&ps->wait);
 615         ps->discsignr = 0;
 616         ps->disc_pid = get_pid(task_pid(current));
 617         ps->disc_uid = cred->uid;
 618         ps->disc_euid = cred->euid;
 619         ps->disccontext = NULL;
 620         ps->ifclaimed = 0;
 621         security_task_getsecid(current, &ps->secid);
 622         smp_wmb();
 623         list_add_tail(&ps->list, &dev->filelist);
 624         file->private_data = ps;
 625         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
 626                         current->comm);
 627  out:
 628         if (ret) {
 629                 kfree(ps);
 630                 usb_put_dev(dev);
 631         }
 632         mutex_unlock(&usbfs_mutex);
 633         unlock_kernel();
 634         return ret;
 635 }
 636
 637 static int usbdev_release(struct inode *inode, struct file *file)
 638 {
 639         struct dev_state *ps = file->private_data;
 640         struct usb_device *dev = ps->dev;
 641         unsigned int ifnum;
 642         struct async *as;
 643
 644         usb_lock_device(dev);
 645
 646         /* Protect against simultaneous open */
 647         mutex_lock(&usbfs_mutex);
 648         list_del_init(&ps->list);
 649         mutex_unlock(&usbfs_mutex);
 650
 651         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 652                         ifnum++) {
 653                 if (test_bit(ifnum, &ps->ifclaimed))
 654                         releaseintf(ps, ifnum);
 655         }
 656         destroy_all_async(ps);
 657         usb_autosuspend_device(dev);
 658         usb_unlock_device(dev);
 659         usb_put_dev(dev);
 660         put_pid(ps->disc_pid);
 661
 662         as = async_getcompleted(ps);
 663         while (as) {
 664                 free_async(as);
 665                 as = async_getcompleted(ps);
 666         }
 667         kfree(ps);
 668         return 0;
 669 }
 670
 671 static int proc_control(struct dev_state *ps, void __user *arg)
 672 {
 673         struct usb_device *dev = ps->dev;
 674         struct usbdevfs_ctrltransfer ctrl;
 675         unsigned int tmo;
 676         unsigned char *tbuf;
 677         unsigned wLength;
 678         int i, j, ret;
 679
 680         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 681                 return -EFAULT;
 682         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
 683         if (ret)
 684                 return ret;
 685         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
 686         if (wLength > PAGE_SIZE)
 687                 return -EINVAL;
 688         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
 689         if (!tbuf)
 690                 return -ENOMEM;
 691         tmo = ctrl.timeout;
 692         if (ctrl.bRequestType & 0x80) {
 693                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
 694                                                ctrl.wLength)) {
 695                         free_page((unsigned long)tbuf);
 696                         return -EINVAL;
 697                 }
 698                 snoop(&dev->dev, "control read: bRequest=%02x "
 699                                 "bRrequestType=%02x wValue=%04x "
 700                                 "wIndex=%04x wLength=%04x\n",
 701                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 702                                 ctrl.wIndex, ctrl.wLength);
 703
 704                 usb_unlock_device(dev);
 705                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest,
 706                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 707                                     tbuf, ctrl.wLength, tmo);
 708                 usb_lock_device(dev);
 709                 if ((i > 0) && ctrl.wLength) {
 710                         if (usbfs_snoop) {
 711                                 dev_info(&dev->dev, "control read: data ");
 712                                 for (j = 0; j < i; ++j)
 713                                         printk("%02x ", (u8)(tbuf)[j]);
 714                                 printk("\n");
 715                         }
 716                         if (copy_to_user(ctrl.data, tbuf, i)) {
 717                                 free_page((unsigned long)tbuf);
 718                                 return -EFAULT;
 719                         }
 720                 }
 721         } else {
 722                 if (ctrl.wLength) {
 723                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 724                                 free_page((unsigned long)tbuf);
 725                                 return -EFAULT;
 726                         }
 727                 }
 728                 snoop(&dev->dev, "control write: bRequest=%02x "
 729                                 "bRrequestType=%02x wValue=%04x "
 730                                 "wIndex=%04x wLength=%04x\n",
 731                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 732                                 ctrl.wIndex, ctrl.wLength);
 733                 if (usbfs_snoop) {
 734                         dev_info(&dev->dev, "control write: data: ");
 735                         for (j = 0; j < ctrl.wLength; ++j)
 736                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 737                         printk("\n");
 738                 }
 739                 usb_unlock_device(dev);
 740                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
 741                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 742                                     tbuf, ctrl.wLength, tmo);
 743                 usb_lock_device(dev);
 744         }
 745         free_page((unsigned long)tbuf);
 746         if (i < 0 && i != -EPIPE) {
 747                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 748                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 749                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 750                            ctrl.wLength, i);
 751         }
 752         return i;
 753 }
 754
 755 static int proc_bulk(struct dev_state *ps, void __user *arg)
 756 {
 757         struct usb_device *dev = ps->dev;
 758         struct usbdevfs_bulktransfer bulk;
 759         unsigned int tmo, len1, pipe;
 760         int len2;
 761         unsigned char *tbuf;
 762         int i, j, ret;
 763
 764         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 765                 return -EFAULT;
 766         ret = findintfep(ps->dev, bulk.ep);
 767         if (ret < 0)
 768                 return ret;
 769         ret = checkintf(ps, ret);
 770         if (ret)
 771                 return ret;
 772         if (bulk.ep & USB_DIR_IN)
 773                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 774         else
 775                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 776         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 777                 return -EINVAL;
 778         len1 = bulk.len;
 779         if (len1 > MAX_USBFS_BUFFER_SIZE)
 780                 return -EINVAL;
 781         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 782                 return -ENOMEM;
 783         tmo = bulk.timeout;
 784         if (bulk.ep & 0x80) {
 785                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 786                         kfree(tbuf);
 787                         return -EINVAL;
 788                 }
 789                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
 790                         bulk.len, bulk.timeout);
 791                 usb_unlock_device(dev);
 792                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 793                 usb_lock_device(dev);
 794                 if (!i && len2) {
 795                         if (usbfs_snoop) {
 796                                 dev_info(&dev->dev, "bulk read: data ");
 797                                 for (j = 0; j < len2; ++j)
 798                                         printk("%02x ", (u8)(tbuf)[j]);
 799                                 printk("\n");
 800                         }
 801                         if (copy_to_user(bulk.data, tbuf, len2)) {
 802                                 kfree(tbuf);
 803                                 return -EFAULT;
 804                         }
 805                 }
 806         } else {
 807                 if (len1) {
 808                         if (copy_from_user(tbuf, bulk.data, len1)) {
 809                                 kfree(tbuf);
 810                                 return -EFAULT;
 811                         }
 812                 }
 813                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
 814                         bulk.len, bulk.timeout);
 815                 if (usbfs_snoop) {
 816                         dev_info(&dev->dev, "bulk write: data: ");
 817                         for (j = 0; j < len1; ++j)
 818                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 819                         printk("\n");
 820                 }
 821                 usb_unlock_device(dev);
 822                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 823                 usb_lock_device(dev);
 824         }
 825         kfree(tbuf);
 826         if (i < 0)
 827                 return i;
 828         return len2;
 829 }
 830
 831 static int proc_resetep(struct dev_state *ps, void __user *arg)
 832 {
 833         unsigned int ep;
 834         int ret;
 835
 836         if (get_user(ep, (unsigned int __user *)arg))
 837                 return -EFAULT;
 838         ret = findintfep(ps->dev, ep);
 839         if (ret < 0)
 840                 return ret;
 841         ret = checkintf(ps, ret);
 842         if (ret)
 843                 return ret;
 844         usb_reset_endpoint(ps->dev, ep);
 845         return 0;
 846 }
 847
 848 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 849 {
 850         unsigned int ep;
 851         int pipe;
 852         int ret;
 853
 854         if (get_user(ep, (unsigned int __user *)arg))
 855                 return -EFAULT;
 856         ret = findintfep(ps->dev, ep);
 857         if (ret < 0)
 858                 return ret;
 859         ret = checkintf(ps, ret);
 860         if (ret)
 861                 return ret;
 862         if (ep & USB_DIR_IN)
 863                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 864         else
 865                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 866
 867         return usb_clear_halt(ps->dev, pipe);
 868 }
 869
 870 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 871 {
 872         struct usbdevfs_getdriver gd;
 873         struct usb_interface *intf;
 874         int ret;
 875
 876         if (copy_from_user(&gd, arg, sizeof(gd)))
 877                 return -EFAULT;
 878         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 879         if (!intf || !intf->dev.driver)
 880                 ret = -ENODATA;
 881         else {
 882                 strncpy(gd.driver, intf->dev.driver->name,
 883                                 sizeof(gd.driver));
 884                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 885         }
 886         return ret;
 887 }
 888
 889 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 890 {
 891         struct usbdevfs_connectinfo ci;
 892
 893         ci.devnum = ps->dev->devnum;
 894         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 895         if (copy_to_user(arg, &ci, sizeof(ci)))
 896                 return -EFAULT;
 897         return 0;
 898 }
 899
 900 static int proc_resetdevice(struct dev_state *ps)
 901 {
 902         return usb_reset_device(ps->dev);
 903 }
 904
 905 static int proc_setintf(struct dev_state *ps, void __user *arg)
 906 {
 907         struct usbdevfs_setinterface setintf;
 908         int ret;
 909
 910         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 911                 return -EFAULT;
 912         if ((ret = checkintf(ps, setintf.interface)))
 913                 return ret;
 914         return usb_set_interface(ps->dev, setintf.interface,
 915                         setintf.altsetting);
 916 }
 917
 918 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 919 {
 920         int u;
 921         int status = 0;
 922         struct usb_host_config *actconfig;
 923
 924         if (get_user(u, (int __user *)arg))
 925                 return -EFAULT;
 926
 927         actconfig = ps->dev->actconfig;
 928
 929         /* Don't touch the device if any interfaces are claimed.
 930          * It could interfere with other drivers' operations, and if
 931          * an interface is claimed by usbfs it could easily deadlock.
 932          */
 933         if (actconfig) {
 934                 int i;
 935
 936                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 937                         if (usb_interface_claimed(actconfig->interface[i])) {
 938                                 dev_warn(&ps->dev->dev,
 939                                         "usbfs: interface %d claimed by %s "
 940                                         "while '%s' sets config #%d\n",
 941                                         actconfig->interface[i]
 942                                                 ->cur_altsetting
 943                                                 ->desc.bInterfaceNumber,
 944                                         actconfig->interface[i]
 945                                                 ->dev.driver->name,
 946                                         current->comm, u);
 947                                 status = -EBUSY;
 948                                 break;
 949                         }
 950                 }
 951         }
 952
 953         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 954          * so avoid usb_set_configuration()'s kick to sysfs
 955          */
 956         if (status == 0) {
 957                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 958                         status = usb_reset_configuration(ps->dev);
 959                 else
 960                         status = usb_set_configuration(ps->dev, u);
 961         }
 962
 963         return status;
 964 }
 965
 966 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 967                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
 968                         void __user *arg)
 969 {
 970         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 971         struct usb_host_endpoint *ep;
 972         struct async *as;
 973         struct usb_ctrlrequest *dr = NULL;
 974         const struct cred *cred = current_cred();
 975         unsigned int u, totlen, isofrmlen;
 976         int ret, ifnum = -1;
 977         int is_in;
 978
 979         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
 980                                 USBDEVFS_URB_SHORT_NOT_OK |
 981                                 USBDEVFS_URB_NO_FSBR |
 982                                 USBDEVFS_URB_ZERO_PACKET |
 983                                 USBDEVFS_URB_NO_INTERRUPT))
 984                 return -EINVAL;
 985         if (!uurb->buffer)
 986                 return -EINVAL;
 987         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
 988             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
 989                 ifnum = findintfep(ps->dev, uurb->endpoint);
 990                 if (ifnum < 0)
 991                         return ifnum;
 992                 ret = checkintf(ps, ifnum);
 993                 if (ret)
 994                         return ret;
 995         }
 996         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
 997                 is_in = 1;
 998                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 999         } else {
1000                 is_in = 0;
1001                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1002         }
1003         if (!ep)
1004                 return -ENOENT;
1005         switch(uurb->type) {
1006         case USBDEVFS_URB_TYPE_CONTROL:
1007                 if (!usb_endpoint_xfer_control(&ep->desc))
1008                         return -EINVAL;
1009                 /* min 8 byte setup packet,
1010                  * max 8 byte setup plus an arbitrary data stage */
1011                 if (uurb->buffer_length < 8 ||
1012                     uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1013                         return -EINVAL;
1014                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1015                 if (!dr)
1016                         return -ENOMEM;
1017                 if (copy_from_user(dr, uurb->buffer, 8)) {
1018                         kfree(dr);
1019                         return -EFAULT;
1020                 }
1021                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1022                         kfree(dr);
1023                         return -EINVAL;
1024                 }
1025                 ret = check_ctrlrecip(ps, dr->bRequestType,
1026                                       le16_to_cpup(&dr->wIndex));
1027                 if (ret) {
1028                         kfree(dr);
1029                         return ret;
1030                 }
1031                 uurb->number_of_packets = 0;
1032                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1033                 uurb->buffer += 8;
1034                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1035                         is_in = 1;
1036                         uurb->endpoint |= USB_DIR_IN;
1037                 } else {
1038                         is_in = 0;
1039                         uurb->endpoint &= ~USB_DIR_IN;
1040                 }
1041                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1042                                 uurb->buffer, uurb->buffer_length)) {
1043                         kfree(dr);
1044                         return -EFAULT;
1045                 }
1046                 snoop(&ps->dev->dev, "control urb: bRequest=%02x "
1047                         "bRrequestType=%02x wValue=%04x "
1048                         "wIndex=%04x wLength=%04x\n",
1049                         dr->bRequest, dr->bRequestType,
1050                         __le16_to_cpup(&dr->wValue),
1051                         __le16_to_cpup(&dr->wIndex),
1052                         __le16_to_cpup(&dr->wLength));
1053                 break;
1054
1055         case USBDEVFS_URB_TYPE_BULK:
1056                 switch (usb_endpoint_type(&ep->desc)) {
1057                 case USB_ENDPOINT_XFER_CONTROL:
1058                 case USB_ENDPOINT_XFER_ISOC:
1059                         return -EINVAL;
1060                 /* allow single-shot interrupt transfers, at bogus rates */
1061                 }
1062                 uurb->number_of_packets = 0;
1063                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1064                         return -EINVAL;
1065                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1066                                 uurb->buffer, uurb->buffer_length))
1067                         return -EFAULT;
1068                 snoop(&ps->dev->dev, "bulk urb\n");
1069                 break;
1070
1071         case USBDEVFS_URB_TYPE_ISO:
1072                 /* arbitrary limit */
1073                 if (uurb->number_of_packets < 1 ||
1074                     uurb->number_of_packets > 128)
1075                         return -EINVAL;
1076                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1077                         return -EINVAL;
1078                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1079                                    uurb->number_of_packets;
1080                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1081                         return -ENOMEM;
1082                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1083                         kfree(isopkt);
1084                         return -EFAULT;
1085                 }
1086                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1087                         /* arbitrary limit,
1088                          * sufficient for USB 2.0 high-bandwidth iso */
1089                         if (isopkt[u].length > 8192) {
1090                                 kfree(isopkt);
1091                                 return -EINVAL;
1092                         }
1093                         totlen += isopkt[u].length;
1094                 }
1095                 if (totlen > 32768) {
1096                         kfree(isopkt);
1097                         return -EINVAL;
1098                 }
1099                 uurb->buffer_length = totlen;
1100                 snoop(&ps->dev->dev, "iso urb\n");
1101                 break;
1102
1103         case USBDEVFS_URB_TYPE_INTERRUPT:
1104                 uurb->number_of_packets = 0;
1105                 if (!usb_endpoint_xfer_int(&ep->desc))
1106                         return -EINVAL;
1107                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1108                         return -EINVAL;
1109                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1110                                 uurb->buffer, uurb->buffer_length))
1111                         return -EFAULT;
1112                 snoop(&ps->dev->dev, "interrupt urb\n");
1113                 break;
1114
1115         default:
1116                 return -EINVAL;
1117         }
1118         as = alloc_async(uurb->number_of_packets);
1119         if (!as) {
1120                 kfree(isopkt);
1121                 kfree(dr);
1122                 return -ENOMEM;
1123         }
1124         as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL);
1125         if (!as->urb->transfer_buffer) {
1126                 kfree(isopkt);
1127                 kfree(dr);
1128                 free_async(as);
1129                 return -ENOMEM;
1130         }
1131         as->urb->dev = ps->dev;
1132         as->urb->pipe = (uurb->type << 30) |
1133                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1134                         (uurb->endpoint & USB_DIR_IN);
1135
1136         /* This tedious sequence is necessary because the URB_* flags
1137          * are internal to the kernel and subject to change, whereas
1138          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1139          */
1140         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1141         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1142                 u |= URB_ISO_ASAP;
1143         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1144                 u |= URB_SHORT_NOT_OK;
1145         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1146                 u |= URB_NO_FSBR;
1147         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1148                 u |= URB_ZERO_PACKET;
1149         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1150                 u |= URB_NO_INTERRUPT;
1151         as->urb->transfer_flags = u;
1152
1153         as->urb->transfer_buffer_length = uurb->buffer_length;
1154         as->urb->setup_packet = (unsigned char *)dr;
1155         as->urb->start_frame = uurb->start_frame;
1156         as->urb->number_of_packets = uurb->number_of_packets;
1157         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1158                         ps->dev->speed == USB_SPEED_HIGH)
1159                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1160         else
1161                 as->urb->interval = ep->desc.bInterval;
1162         as->urb->context = as;
1163         as->urb->complete = async_completed;
1164         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1165                 as->urb->iso_frame_desc[u].offset = totlen;
1166                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1167                 totlen += isopkt[u].length;
1168         }
1169         kfree(isopkt);
1170         as->ps = ps;
1171         as->userurb = arg;
1172         if (uurb->endpoint & USB_DIR_IN)
1173                 as->userbuffer = uurb->buffer;
1174         else
1175                 as->userbuffer = NULL;
1176         as->signr = uurb->signr;
1177         as->ifnum = ifnum;
1178         as->pid = get_pid(task_pid(current));
1179         as->uid = cred->uid;
1180         as->euid = cred->euid;
1181         security_task_getsecid(current, &as->secid);
1182         if (!is_in) {
1183                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1184                                 as->urb->transfer_buffer_length)) {
1185                         free_async(as);
1186                         return -EFAULT;
1187                 }
1188         }
1189         snoop_urb(as->urb, as->userurb);
1190         async_newpending(as);
1191         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1192                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1193                            "usbfs: usb_submit_urb returned %d\n", ret);
1194                 async_removepending(as);
1195                 free_async(as);
1196                 return ret;
1197         }
1198         return 0;
1199 }
1200
1201 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1202 {
1203         struct usbdevfs_urb uurb;
1204
1205         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1206                 return -EFAULT;
1207
1208         return proc_do_submiturb(ps, &uurb,
1209                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1210                         arg);
1211 }
1212
1213 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1214 {
1215         struct async *as;
1216
1217         as = async_getpending(ps, arg);
1218         if (!as)
1219                 return -EINVAL;
1220         usb_kill_urb(as->urb);
1221         return 0;
1222 }
1223
1224 static int processcompl(struct async *as, void __user * __user *arg)
1225 {
1226         struct urb *urb = as->urb;
1227         struct usbdevfs_urb __user *userurb = as->userurb;
1228         void __user *addr = as->userurb;
1229         unsigned int i;
1230
1231         if (as->userbuffer)
1232                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1233                                  urb->transfer_buffer_length))
1234                         return -EFAULT;
1235         if (put_user(as->status, &userurb->status))
1236                 return -EFAULT;
1237         if (put_user(urb->actual_length, &userurb->actual_length))
1238                 return -EFAULT;
1239         if (put_user(urb->error_count, &userurb->error_count))
1240                 return -EFAULT;
1241
1242         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1243                 for (i = 0; i < urb->number_of_packets; i++) {
1244                         if (put_user(urb->iso_frame_desc[i].actual_length,
1245                                      &userurb->iso_frame_desc[i].actual_length))
1246                                 return -EFAULT;
1247                         if (put_user(urb->iso_frame_desc[i].status,
1248                                      &userurb->iso_frame_desc[i].status))
1249                                 return -EFAULT;
1250                 }
1251         }
1252
1253         free_async(as);
1254
1255         if (put_user(addr, (void __user * __user *)arg))
1256                 return -EFAULT;
1257         return 0;
1258 }
1259
1260 static struct async *reap_as(struct dev_state *ps)
1261 {
1262         DECLARE_WAITQUEUE(wait, current);
1263         struct async *as = NULL;
1264         struct usb_device *dev = ps->dev;
1265
1266         add_wait_queue(&ps->wait, &wait);
1267         for (;;) {
1268                 __set_current_state(TASK_INTERRUPTIBLE);
1269                 as = async_getcompleted(ps);
1270                 if (as)
1271                         break;
1272                 if (signal_pending(current))
1273                         break;
1274                 usb_unlock_device(dev);
1275                 schedule();
1276                 usb_lock_device(dev);
1277         }
1278         remove_wait_queue(&ps->wait, &wait);
1279         set_current_state(TASK_RUNNING);
1280         return as;
1281 }
1282
1283 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1284 {
1285         struct async *as = reap_as(ps);
1286         if (as)
1287                 return processcompl(as, (void __user * __user *)arg);
1288         if (signal_pending(current))
1289                 return -EINTR;
1290         return -EIO;
1291 }
1292
1293 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1294 {
1295         struct async *as;
1296
1297         if (!(as = async_getcompleted(ps)))
1298                 return -EAGAIN;
1299         return processcompl(as, (void __user * __user *)arg);
1300 }
1301
1302 #ifdef CONFIG_COMPAT
1303
1304 static int get_urb32(struct usbdevfs_urb *kurb,
1305                      struct usbdevfs_urb32 __user *uurb)
1306 {
1307         __u32  uptr;
1308         if (get_user(kurb->type, &uurb->type) ||
1309             __get_user(kurb->endpoint, &uurb->endpoint) ||
1310             __get_user(kurb->status, &uurb->status) ||
1311             __get_user(kurb->flags, &uurb->flags) ||
1312             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1313             __get_user(kurb->actual_length, &uurb->actual_length) ||
1314             __get_user(kurb->start_frame, &uurb->start_frame) ||
1315             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1316             __get_user(kurb->error_count, &uurb->error_count) ||
1317             __get_user(kurb->signr, &uurb->signr))
1318                 return -EFAULT;
1319
1320         if (__get_user(uptr, &uurb->buffer))
1321                 return -EFAULT;
1322         kurb->buffer = compat_ptr(uptr);
1323         if (__get_user(uptr, &uurb->usercontext))
1324                 return -EFAULT;
1325         kurb->usercontext = compat_ptr(uptr);
1326
1327         return 0;
1328 }
1329
1330 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1331 {
1332         struct usbdevfs_urb uurb;
1333
1334         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1335                 return -EFAULT;
1336
1337         return proc_do_submiturb(ps, &uurb,
1338                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1339                         arg);
1340 }
1341
1342 static int processcompl_compat(struct async *as, void __user * __user *arg)
1343 {
1344         struct urb *urb = as->urb;
1345         struct usbdevfs_urb32 __user *userurb = as->userurb;
1346         void __user *addr = as->userurb;
1347         unsigned int i;
1348
1349         if (as->userbuffer)
1350                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1351                                  urb->transfer_buffer_length))
1352                         return -EFAULT;
1353         if (put_user(as->status, &userurb->status))
1354                 return -EFAULT;
1355         if (put_user(urb->actual_length, &userurb->actual_length))
1356                 return -EFAULT;
1357         if (put_user(urb->error_count, &userurb->error_count))
1358                 return -EFAULT;
1359
1360         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1361                 for (i = 0; i < urb->number_of_packets; i++) {
1362                         if (put_user(urb->iso_frame_desc[i].actual_length,
1363                                      &userurb->iso_frame_desc[i].actual_length))
1364                                 return -EFAULT;
1365                         if (put_user(urb->iso_frame_desc[i].status,
1366                                      &userurb->iso_frame_desc[i].status))
1367                                 return -EFAULT;
1368                 }
1369         }
1370
1371         free_async(as);
1372         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1373                 return -EFAULT;
1374         return 0;
1375 }
1376
1377 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1378 {
1379         struct async *as = reap_as(ps);
1380         if (as)
1381                 return processcompl_compat(as, (void __user * __user *)arg);
1382         if (signal_pending(current))
1383                 return -EINTR;
1384         return -EIO;
1385 }
1386
1387 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1388 {
1389         struct async *as;
1390
1391         if (!(as = async_getcompleted(ps)))
1392                 return -EAGAIN;
1393         return processcompl_compat(as, (void __user * __user *)arg);
1394 }
1395
1396 #endif
1397
1398 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1399 {
1400         struct usbdevfs_disconnectsignal ds;
1401
1402         if (copy_from_user(&ds, arg, sizeof(ds)))
1403                 return -EFAULT;
1404         ps->discsignr = ds.signr;
1405         ps->disccontext = ds.context;
1406         return 0;
1407 }
1408
1409 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1410 {
1411         unsigned int ifnum;
1412
1413         if (get_user(ifnum, (unsigned int __user *)arg))
1414                 return -EFAULT;
1415         return claimintf(ps, ifnum);
1416 }
1417
1418 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1419 {
1420         unsigned int ifnum;
1421         int ret;
1422
1423         if (get_user(ifnum, (unsigned int __user *)arg))
1424                 return -EFAULT;
1425         if ((ret = releaseintf(ps, ifnum)) < 0)
1426                 return ret;
1427         destroy_async_on_interface (ps, ifnum);
1428         return 0;
1429 }
1430
1431 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1432 {
1433         int                     size;
1434         void                    *buf = NULL;
1435         int                     retval = 0;
1436         struct usb_interface    *intf = NULL;
1437         struct usb_driver       *driver = NULL;
1438
1439         /* alloc buffer */
1440         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1441                 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1442                         return -ENOMEM;
1443                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1444                         if (copy_from_user(buf, ctl->data, size)) {
1445                                 kfree(buf);
1446                                 return -EFAULT;
1447                         }
1448                 } else {
1449                         memset(buf, 0, size);
1450                 }
1451         }
1452
1453         if (!connected(ps)) {
1454                 kfree(buf);
1455                 return -ENODEV;
1456         }
1457
1458         if (ps->dev->state != USB_STATE_CONFIGURED)
1459                 retval = -EHOSTUNREACH;
1460         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1461                 retval = -EINVAL;
1462         else switch (ctl->ioctl_code) {
1463
1464         /* disconnect kernel driver from interface */
1465         case USBDEVFS_DISCONNECT:
1466                 if (intf->dev.driver) {
1467                         driver = to_usb_driver(intf->dev.driver);
1468                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1469                         usb_driver_release_interface(driver, intf);
1470                 } else
1471                         retval = -ENODATA;
1472                 break;
1473
1474         /* let kernel drivers try to (re)bind to the interface */
1475         case USBDEVFS_CONNECT:
1476                 if (!intf->dev.driver)
1477                         retval = device_attach(&intf->dev);
1478                 else
1479                         retval = -EBUSY;
1480                 break;
1481
1482         /* talk directly to the interface's driver */
1483         default:
1484                 if (intf->dev.driver)
1485                         driver = to_usb_driver(intf->dev.driver);
1486                 if (driver == NULL || driver->ioctl == NULL) {
1487                         retval = -ENOTTY;
1488                 } else {
1489                         retval = driver->ioctl(intf, ctl->ioctl_code, buf);
1490                         if (retval == -ENOIOCTLCMD)
1491                                 retval = -ENOTTY;
1492                 }
1493         }
1494
1495         /* cleanup and return */
1496         if (retval >= 0
1497                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1498                         && size > 0
1499                         && copy_to_user(ctl->data, buf, size) != 0)
1500                 retval = -EFAULT;
1501
1502         kfree(buf);
1503         return retval;
1504 }
1505
1506 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1507 {
1508         struct usbdevfs_ioctl   ctrl;
1509
1510         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1511                 return -EFAULT;
1512         return proc_ioctl(ps, &ctrl);
1513 }
1514
1515 #ifdef CONFIG_COMPAT
1516 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1517 {
1518         struct usbdevfs_ioctl32 __user *uioc;
1519         struct usbdevfs_ioctl ctrl;
1520         u32 udata;
1521
1522         uioc = compat_ptr((long)arg);
1523         if (get_user(ctrl.ifno, &uioc->ifno) ||
1524             get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1525             __get_user(udata, &uioc->data))
1526                 return -EFAULT;
1527         ctrl.data = compat_ptr(udata);
1528
1529         return proc_ioctl(ps, &ctrl);
1530 }
1531 #endif
1532
1533 /*
1534  * NOTE:  All requests here that have interface numbers as parameters
1535  * are assuming that somehow the configuration has been prevented from
1536  * changing.  But there's no mechanism to ensure that...
1537  */
1538 static int usbdev_ioctl(struct inode *inode, struct file *file,
1539                         unsigned int cmd, unsigned long arg)
1540 {
1541         struct dev_state *ps = file->private_data;
1542         struct usb_device *dev = ps->dev;
1543         void __user *p = (void __user *)arg;
1544         int ret = -ENOTTY;
1545
1546         if (!(file->f_mode & FMODE_WRITE))
1547                 return -EPERM;
1548         usb_lock_device(dev);
1549         if (!connected(ps)) {
1550                 usb_unlock_device(dev);
1551                 return -ENODEV;
1552         }
1553
1554         switch (cmd) {
1555         case USBDEVFS_CONTROL:
1556                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1557                 ret = proc_control(ps, p);
1558                 if (ret >= 0)
1559                         inode->i_mtime = CURRENT_TIME;
1560                 break;
1561
1562         case USBDEVFS_BULK:
1563                 snoop(&dev->dev, "%s: BULK\n", __func__);
1564                 ret = proc_bulk(ps, p);
1565                 if (ret >= 0)
1566                         inode->i_mtime = CURRENT_TIME;
1567                 break;
1568
1569         case USBDEVFS_RESETEP:
1570                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1571                 ret = proc_resetep(ps, p);
1572                 if (ret >= 0)
1573                         inode->i_mtime = CURRENT_TIME;
1574                 break;
1575
1576         case USBDEVFS_RESET:
1577                 snoop(&dev->dev, "%s: RESET\n", __func__);
1578                 ret = proc_resetdevice(ps);
1579                 break;
1580
1581         case USBDEVFS_CLEAR_HALT:
1582                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1583                 ret = proc_clearhalt(ps, p);
1584                 if (ret >= 0)
1585                         inode->i_mtime = CURRENT_TIME;
1586                 break;
1587
1588         case USBDEVFS_GETDRIVER:
1589                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1590                 ret = proc_getdriver(ps, p);
1591                 break;
1592
1593         case USBDEVFS_CONNECTINFO:
1594                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1595                 ret = proc_connectinfo(ps, p);
1596                 break;
1597
1598         case USBDEVFS_SETINTERFACE:
1599                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1600                 ret = proc_setintf(ps, p);
1601                 break;
1602
1603         case USBDEVFS_SETCONFIGURATION:
1604                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1605                 ret = proc_setconfig(ps, p);
1606                 break;
1607
1608         case USBDEVFS_SUBMITURB:
1609                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1610                 ret = proc_submiturb(ps, p);
1611                 if (ret >= 0)
1612                         inode->i_mtime = CURRENT_TIME;
1613                 break;
1614
1615 #ifdef CONFIG_COMPAT
1616
1617         case USBDEVFS_SUBMITURB32:
1618                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1619                 ret = proc_submiturb_compat(ps, p);
1620                 if (ret >= 0)
1621                         inode->i_mtime = CURRENT_TIME;
1622                 break;
1623
1624         case USBDEVFS_REAPURB32:
1625                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1626                 ret = proc_reapurb_compat(ps, p);
1627                 break;
1628
1629         case USBDEVFS_REAPURBNDELAY32:
1630                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __func__);
1631                 ret = proc_reapurbnonblock_compat(ps, p);
1632                 break;
1633
1634         case USBDEVFS_IOCTL32:
1635                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1636                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1637                 break;
1638 #endif
1639
1640         case USBDEVFS_DISCARDURB:
1641                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1642                 ret = proc_unlinkurb(ps, p);
1643                 break;
1644
1645         case USBDEVFS_REAPURB:
1646                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1647                 ret = proc_reapurb(ps, p);
1648                 break;
1649
1650         case USBDEVFS_REAPURBNDELAY:
1651                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __func__);
1652                 ret = proc_reapurbnonblock(ps, p);
1653                 break;
1654
1655         case USBDEVFS_DISCSIGNAL:
1656                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1657                 ret = proc_disconnectsignal(ps, p);
1658                 break;
1659
1660         case USBDEVFS_CLAIMINTERFACE:
1661                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1662                 ret = proc_claiminterface(ps, p);
1663                 break;
1664
1665         case USBDEVFS_RELEASEINTERFACE:
1666                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1667                 ret = proc_releaseinterface(ps, p);
1668                 break;
1669
1670         case USBDEVFS_IOCTL:
1671                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1672                 ret = proc_ioctl_default(ps, p);
1673                 break;
1674         }
1675         usb_unlock_device(dev);
1676         if (ret >= 0)
1677                 inode->i_atime = CURRENT_TIME;
1678         return ret;
1679 }
1680
1681 /* No kernel lock - fine */
1682 static unsigned int usbdev_poll(struct file *file,
1683                                 struct poll_table_struct *wait)
1684 {
1685         struct dev_state *ps = file->private_data;
1686         unsigned int mask = 0;
1687
1688         poll_wait(file, &ps->wait, wait);
1689         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1690                 mask |= POLLOUT | POLLWRNORM;
1691         if (!connected(ps))
1692                 mask |= POLLERR | POLLHUP;
1693         return mask;
1694 }
1695
1696 const struct file_operations usbdev_file_operations = {
1697         .owner =        THIS_MODULE,
1698         .llseek =       usbdev_lseek,
1699         .read =         usbdev_read,
1700         .poll =         usbdev_poll,
1701         .ioctl =        usbdev_ioctl,
1702         .open =         usbdev_open,
1703         .release =      usbdev_release,
1704 };
1705
1706 static void usbdev_remove(struct usb_device *udev)
1707 {
1708         struct dev_state *ps;
1709         struct siginfo sinfo;
1710
1711         while (!list_empty(&udev->filelist)) {
1712                 ps = list_entry(udev->filelist.next, struct dev_state, list);
1713                 destroy_all_async(ps);
1714                 wake_up_all(&ps->wait);
1715                 list_del_init(&ps->list);
1716                 if (ps->discsignr) {
1717                         sinfo.si_signo = ps->discsignr;
1718                         sinfo.si_errno = EPIPE;
1719                         sinfo.si_code = SI_ASYNCIO;
1720                         sinfo.si_addr = ps->disccontext;
1721                         kill_pid_info_as_uid(ps->discsignr, &sinfo,
1722                                         ps->disc_pid, ps->disc_uid,
1723                                         ps->disc_euid, ps->secid);
1724                 }
1725         }
1726 }
1727
1728 #ifdef CONFIG_USB_DEVICE_CLASS
1729 static struct class *usb_classdev_class;
1730
1731 static int usb_classdev_add(struct usb_device *dev)
1732 {
1733         struct device *cldev;
1734
1735         cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
1736                               NULL, "usbdev%d.%d", dev->bus->busnum,
1737                               dev->devnum);
1738         if (IS_ERR(cldev))
1739                 return PTR_ERR(cldev);
1740         dev->usb_classdev = cldev;
1741         return 0;
1742 }
1743
1744 static void usb_classdev_remove(struct usb_device *dev)
1745 {
1746         if (dev->usb_classdev)
1747                 device_unregister(dev->usb_classdev);
1748 }
1749
1750 #else
1751 #define usb_classdev_add(dev)           0
1752 #define usb_classdev_remove(dev)        do {} while (0)
1753
1754 #endif
1755
1756 static int usbdev_notify(struct notifier_block *self,
1757                                unsigned long action, void *dev)
1758 {
1759         switch (action) {
1760         case USB_DEVICE_ADD:
1761                 if (usb_classdev_add(dev))
1762                         return NOTIFY_BAD;
1763                 break;
1764         case USB_DEVICE_REMOVE:
1765                 usb_classdev_remove(dev);
1766                 usbdev_remove(dev);
1767                 break;
1768         }
1769         return NOTIFY_OK;
1770 }
1771
1772 static struct notifier_block usbdev_nb = {
1773         .notifier_call =        usbdev_notify,
1774 };
1775
1776 static struct cdev usb_device_cdev;
1777
1778 int __init usb_devio_init(void)
1779 {
1780         int retval;
1781
1782         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1783                                         "usb_device");
1784         if (retval) {
1785                 printk(KERN_ERR "Unable to register minors for usb_device\n");
1786                 goto out;
1787         }
1788         cdev_init(&usb_device_cdev, &usbdev_file_operations);
1789         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1790         if (retval) {
1791                 printk(KERN_ERR "Unable to get usb_device major %d\n",
1792                        USB_DEVICE_MAJOR);
1793                 goto error_cdev;
1794         }
1795 #ifdef CONFIG_USB_DEVICE_CLASS
1796         usb_classdev_class = class_create(THIS_MODULE, "usb_device");
1797         if (IS_ERR(usb_classdev_class)) {
1798                 printk(KERN_ERR "Unable to register usb_device class\n");
1799                 retval = PTR_ERR(usb_classdev_class);
1800                 cdev_del(&usb_device_cdev);
1801                 usb_classdev_class = NULL;
1802                 goto out;
1803         }
1804         /* devices of this class shadow the major:minor of their parent
1805          * device, so clear ->dev_kobj to prevent adding duplicate entries
1806          * to /sys/dev
1807          */
1808         usb_classdev_class->dev_kobj = NULL;
1809 #endif
1810         usb_register_notify(&usbdev_nb);
1811 out:
1812         return retval;
1813
1814 error_cdev:
1815         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1816         goto out;
1817 }
1818
1819 void usb_devio_cleanup(void)
1820 {
1821         usb_unregister_notify(&usbdev_nb);
1822 #ifdef CONFIG_USB_DEVICE_CLASS
1823         class_destroy(usb_classdev_class);
1824 #endif
1825         cdev_del(&usb_device_cdev);
1826         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1827 }