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  *  $Id: devio.c,v 1.7 2000/02/01 17:28:48 fliegl Exp $
  23  *
  24  *  This file implements the usbfs/x/y files, where
  25  *  x is the bus number and y the device number.
  26  *
  27  *  It allows user space programs/"drivers" to communicate directly
  28  *  with USB devices without intervening kernel driver.
  29  *
  30  *  Revision history
  31  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  32  *    04.01.2000   0.2   Turned into its own filesystem
  33  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  34  *                       (CAN-2005-3055)
  35  */
  36
  37 /*****************************************************************************/
  38
  39 #include <linux/fs.h>
  40 #include <linux/mm.h>
  41 #include <linux/slab.h>
  42 #include <linux/smp_lock.h>
  43 #include <linux/signal.h>
  44 #include <linux/poll.h>
  45 #include <linux/module.h>
  46 #include <linux/usb.h>
  47 #include <linux/usbdevice_fs.h>
  48 #include <linux/cdev.h>
  49 #include <linux/notifier.h>
  50 #include <linux/security.h>
  51 #include <asm/uaccess.h>
  52 #include <asm/byteorder.h>
  53 #include <linux/moduleparam.h>
  54
  55 #include "hcd.h"        /* for usbcore internals */
  56 #include "usb.h"
  57
  58 #define USB_MAXBUS                      64
  59 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
  60 static struct class *usb_device_class;
  61
  62 /* Mutual exclusion for removal, open, and release */
  63 DEFINE_MUTEX(usbfs_mutex);
  64
  65 struct async {
  66         struct list_head asynclist;
  67         struct dev_state *ps;
  68         pid_t pid;
  69         uid_t uid, euid;
  70         unsigned int signr;
  71         unsigned int ifnum;
  72         void __user *userbuffer;
  73         void __user *userurb;
  74         struct urb *urb;
  75         u32 secid;
  76 };
  77
  78 static int usbfs_snoop = 0;
  79 module_param (usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  80 MODULE_PARM_DESC (usbfs_snoop, "true to log all usbfs traffic");
  81
  82 #define snoop(dev, format, arg...)                              \
  83         do {                                                    \
  84                 if (usbfs_snoop)                                \
  85                         dev_info( dev , format , ## arg);       \
  86         } while (0)
  87
  88 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
  89
  90
  91 #define MAX_USBFS_BUFFER_SIZE   16384
  92
  93 static inline int connected (struct dev_state *ps)
  94 {
  95         return (!list_empty(&ps->list) &&
  96                         ps->dev->state != USB_STATE_NOTATTACHED);
  97 }
  98
  99 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
 100 {
 101         loff_t ret;
 102
 103         lock_kernel();
 104
 105         switch (orig) {
 106         case 0:
 107                 file->f_pos = offset;
 108                 ret = file->f_pos;
 109                 break;
 110         case 1:
 111                 file->f_pos += offset;
 112                 ret = file->f_pos;
 113                 break;
 114         case 2:
 115         default:
 116                 ret = -EINVAL;
 117         }
 118
 119         unlock_kernel();
 120         return ret;
 121 }
 122
 123 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
 124 {
 125         struct dev_state *ps = (struct dev_state *)file->private_data;
 126         struct usb_device *dev = ps->dev;
 127         ssize_t ret = 0;
 128         unsigned len;
 129         loff_t pos;
 130         int i;
 131
 132         pos = *ppos;
 133         usb_lock_device(dev);
 134         if (!connected(ps)) {
 135                 ret = -ENODEV;
 136                 goto err;
 137         } else if (pos < 0) {
 138                 ret = -EINVAL;
 139                 goto err;
 140         }
 141
 142         if (pos < sizeof(struct usb_device_descriptor)) {
 143                 struct usb_device_descriptor temp_desc ; /* 18 bytes - fits on the stack */
 144
 145                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 146                 le16_to_cpus(&temp_desc.bcdUSB);
 147                 le16_to_cpus(&temp_desc.idVendor);
 148                 le16_to_cpus(&temp_desc.idProduct);
 149                 le16_to_cpus(&temp_desc.bcdDevice);
 150
 151                 len = sizeof(struct usb_device_descriptor) - pos;
 152                 if (len > nbytes)
 153                         len = nbytes;
 154                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 155                         ret = -EFAULT;
 156                         goto err;
 157                 }
 158
 159                 *ppos += len;
 160                 buf += len;
 161                 nbytes -= len;
 162                 ret += len;
 163         }
 164
 165         pos = sizeof(struct usb_device_descriptor);
 166         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 167                 struct usb_config_descriptor *config =
 168                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 169                 unsigned int length = le16_to_cpu(config->wTotalLength);
 170
 171                 if (*ppos < pos + length) {
 172
 173                         /* The descriptor may claim to be longer than it
 174                          * really is.  Here is the actual allocated length. */
 175                         unsigned alloclen =
 176                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 177
 178                         len = length - (*ppos - pos);
 179                         if (len > nbytes)
 180                                 len = nbytes;
 181
 182                         /* Simply don't write (skip over) unallocated parts */
 183                         if (alloclen > (*ppos - pos)) {
 184                                 alloclen -= (*ppos - pos);
 185                                 if (copy_to_user(buf,
 186                                     dev->rawdescriptors[i] + (*ppos - pos),
 187                                     min(len, alloclen))) {
 188                                         ret = -EFAULT;
 189                                         goto err;
 190                                 }
 191                         }
 192
 193                         *ppos += len;
 194                         buf += len;
 195                         nbytes -= len;
 196                         ret += len;
 197                 }
 198
 199                 pos += length;
 200         }
 201
 202 err:
 203         usb_unlock_device(dev);
 204         return ret;
 205 }
 206
 207 /*
 208  * async list handling
 209  */
 210
 211 static struct async *alloc_async(unsigned int numisoframes)
 212 {
 213         unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor);
 214         struct async *as = kzalloc(assize, GFP_KERNEL);
 215
 216         if (!as)
 217                 return NULL;
 218         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 219         if (!as->urb) {
 220                 kfree(as);
 221                 return NULL;
 222         }
 223         return as;
 224 }
 225
 226 static void free_async(struct async *as)
 227 {
 228         kfree(as->urb->transfer_buffer);
 229         kfree(as->urb->setup_packet);
 230         usb_free_urb(as->urb);
 231         kfree(as);
 232 }
 233
 234 static inline void async_newpending(struct async *as)
 235 {
 236         struct dev_state *ps = as->ps;
 237         unsigned long flags;
 238
 239         spin_lock_irqsave(&ps->lock, flags);
 240         list_add_tail(&as->asynclist, &ps->async_pending);
 241         spin_unlock_irqrestore(&ps->lock, flags);
 242 }
 243
 244 static inline void async_removepending(struct async *as)
 245 {
 246         struct dev_state *ps = as->ps;
 247         unsigned long flags;
 248
 249         spin_lock_irqsave(&ps->lock, flags);
 250         list_del_init(&as->asynclist);
 251         spin_unlock_irqrestore(&ps->lock, flags);
 252 }
 253
 254 static inline struct async *async_getcompleted(struct dev_state *ps)
 255 {
 256         unsigned long flags;
 257         struct async *as = NULL;
 258
 259         spin_lock_irqsave(&ps->lock, flags);
 260         if (!list_empty(&ps->async_completed)) {
 261                 as = list_entry(ps->async_completed.next, struct async, asynclist);
 262                 list_del_init(&as->asynclist);
 263         }
 264         spin_unlock_irqrestore(&ps->lock, flags);
 265         return as;
 266 }
 267
 268 static inline struct async *async_getpending(struct dev_state *ps, void __user *userurb)
 269 {
 270         unsigned long flags;
 271         struct async *as;
 272
 273         spin_lock_irqsave(&ps->lock, flags);
 274         list_for_each_entry(as, &ps->async_pending, asynclist)
 275                 if (as->userurb == userurb) {
 276                         list_del_init(&as->asynclist);
 277                         spin_unlock_irqrestore(&ps->lock, flags);
 278                         return as;
 279                 }
 280         spin_unlock_irqrestore(&ps->lock, flags);
 281         return NULL;
 282 }
 283
 284 static void snoop_urb(struct urb *urb, void __user *userurb)
 285 {
 286         int j;
 287         unsigned char *data = urb->transfer_buffer;
 288
 289         if (!usbfs_snoop)
 290                 return;
 291
 292         if (urb->pipe & USB_DIR_IN)
 293                 dev_info(&urb->dev->dev, "direction=IN\n");
 294         else
 295                 dev_info(&urb->dev->dev, "direction=OUT\n");
 296         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
 297         dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
 298                  urb->transfer_buffer_length);
 299         dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
 300         dev_info(&urb->dev->dev, "data: ");
 301         for (j = 0; j < urb->transfer_buffer_length; ++j)
 302                 printk ("%02x ", data[j]);
 303         printk("\n");
 304 }
 305
 306 static void async_completed(struct urb *urb, struct pt_regs *regs)
 307 {
 308         struct async *as = (struct async *)urb->context;
 309         struct dev_state *ps = as->ps;
 310         struct siginfo sinfo;
 311
 312         spin_lock(&ps->lock);
 313         list_move_tail(&as->asynclist, &ps->async_completed);
 314         spin_unlock(&ps->lock);
 315         if (as->signr) {
 316                 sinfo.si_signo = as->signr;
 317                 sinfo.si_errno = as->urb->status;
 318                 sinfo.si_code = SI_ASYNCIO;
 319                 sinfo.si_addr = as->userurb;
 320                 kill_proc_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
 321                                       as->euid, as->secid);
 322         }
 323         snoop(&urb->dev->dev, "urb complete\n");
 324         snoop_urb(urb, as->userurb);
 325         wake_up(&ps->wait);
 326 }
 327
 328 static void destroy_async (struct dev_state *ps, struct list_head *list)
 329 {
 330         struct async *as;
 331         unsigned long flags;
 332
 333         spin_lock_irqsave(&ps->lock, flags);
 334         while (!list_empty(list)) {
 335                 as = list_entry(list->next, struct async, asynclist);
 336                 list_del_init(&as->asynclist);
 337
 338                 /* drop the spinlock so the completion handler can run */
 339                 spin_unlock_irqrestore(&ps->lock, flags);
 340                 usb_kill_urb(as->urb);
 341                 spin_lock_irqsave(&ps->lock, flags);
 342         }
 343         spin_unlock_irqrestore(&ps->lock, flags);
 344         as = async_getcompleted(ps);
 345         while (as) {
 346                 free_async(as);
 347                 as = async_getcompleted(ps);
 348         }
 349 }
 350
 351 static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum)
 352 {
 353         struct list_head *p, *q, hitlist;
 354         unsigned long flags;
 355
 356         INIT_LIST_HEAD(&hitlist);
 357         spin_lock_irqsave(&ps->lock, flags);
 358         list_for_each_safe(p, q, &ps->async_pending)
 359                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 360                         list_move_tail(p, &hitlist);
 361         spin_unlock_irqrestore(&ps->lock, flags);
 362         destroy_async(ps, &hitlist);
 363 }
 364
 365 static inline void destroy_all_async(struct dev_state *ps)
 366 {
 367                 destroy_async(ps, &ps->async_pending);
 368 }
 369
 370 /*
 371  * interface claims are made only at the request of user level code,
 372  * which can also release them (explicitly or by closing files).
 373  * they're also undone when devices disconnect.
 374  */
 375
 376 static int driver_probe (struct usb_interface *intf,
 377                          const struct usb_device_id *id)
 378 {
 379         return -ENODEV;
 380 }
 381
 382 static void driver_disconnect(struct usb_interface *intf)
 383 {
 384         struct dev_state *ps = usb_get_intfdata (intf);
 385         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 386
 387         if (!ps)
 388                 return;
 389
 390         /* NOTE:  this relies on usbcore having canceled and completed
 391          * all pending I/O requests; 2.6 does that.
 392          */
 393
 394         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 395                 clear_bit(ifnum, &ps->ifclaimed);
 396         else
 397                 warn("interface number %u out of range", ifnum);
 398
 399         usb_set_intfdata (intf, NULL);
 400
 401         /* force async requests to complete */
 402         destroy_async_on_interface(ps, ifnum);
 403 }
 404
 405 struct usb_driver usbfs_driver = {
 406         .name =         "usbfs",
 407         .probe =        driver_probe,
 408         .disconnect =   driver_disconnect,
 409 };
 410
 411 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 412 {
 413         struct usb_device *dev = ps->dev;
 414         struct usb_interface *intf;
 415         int err;
 416
 417         if (ifnum >= 8*sizeof(ps->ifclaimed))
 418                 return -EINVAL;
 419         /* already claimed */
 420         if (test_bit(ifnum, &ps->ifclaimed))
 421                 return 0;
 422
 423         /* lock against other changes to driver bindings */
 424         down_write(&usb_bus_type.subsys.rwsem);
 425         intf = usb_ifnum_to_if(dev, ifnum);
 426         if (!intf)
 427                 err = -ENOENT;
 428         else
 429                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 430         up_write(&usb_bus_type.subsys.rwsem);
 431         if (err == 0)
 432                 set_bit(ifnum, &ps->ifclaimed);
 433         return err;
 434 }
 435
 436 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 437 {
 438         struct usb_device *dev;
 439         struct usb_interface *intf;
 440         int err;
 441
 442         err = -EINVAL;
 443         if (ifnum >= 8*sizeof(ps->ifclaimed))
 444                 return err;
 445         dev = ps->dev;
 446         /* lock against other changes to driver bindings */
 447         down_write(&usb_bus_type.subsys.rwsem);
 448         intf = usb_ifnum_to_if(dev, ifnum);
 449         if (!intf)
 450                 err = -ENOENT;
 451         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 452                 usb_driver_release_interface(&usbfs_driver, intf);
 453                 err = 0;
 454         }
 455         up_write(&usb_bus_type.subsys.rwsem);
 456         return err;
 457 }
 458
 459 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 460 {
 461         if (ps->dev->state != USB_STATE_CONFIGURED)
 462                 return -EHOSTUNREACH;
 463         if (ifnum >= 8*sizeof(ps->ifclaimed))
 464                 return -EINVAL;
 465         if (test_bit(ifnum, &ps->ifclaimed))
 466                 return 0;
 467         /* if not yet claimed, claim it for the driver */
 468         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n",
 469                current->pid, current->comm, ifnum);
 470         return claimintf(ps, ifnum);
 471 }
 472
 473 static int findintfep(struct usb_device *dev, unsigned int ep)
 474 {
 475         unsigned int i, j, e;
 476         struct usb_interface *intf;
 477         struct usb_host_interface *alts;
 478         struct usb_endpoint_descriptor *endpt;
 479
 480         if (ep & ~(USB_DIR_IN|0xf))
 481                 return -EINVAL;
 482         if (!dev->actconfig)
 483                 return -ESRCH;
 484         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 485                 intf = dev->actconfig->interface[i];
 486                 for (j = 0; j < intf->num_altsetting; j++) {
 487                         alts = &intf->altsetting[j];
 488                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 489                                 endpt = &alts->endpoint[e].desc;
 490                                 if (endpt->bEndpointAddress == ep)
 491                                         return alts->desc.bInterfaceNumber;
 492                         }
 493                 }
 494         }
 495         return -ENOENT;
 496 }
 497
 498 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
 499 {
 500         int ret = 0;
 501
 502         if (ps->dev->state != USB_STATE_ADDRESS
 503          && ps->dev->state != USB_STATE_CONFIGURED)
 504                 return -EHOSTUNREACH;
 505         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 506                 return 0;
 507
 508         index &= 0xff;
 509         switch (requesttype & USB_RECIP_MASK) {
 510         case USB_RECIP_ENDPOINT:
 511                 if ((ret = findintfep(ps->dev, index)) >= 0)
 512                         ret = checkintf(ps, ret);
 513                 break;
 514
 515         case USB_RECIP_INTERFACE:
 516                 ret = checkintf(ps, index);
 517                 break;
 518         }
 519         return ret;
 520 }
 521
 522 static struct usb_device *usbdev_lookup_minor(int minor)
 523 {
 524         struct class_device *class_dev;
 525         struct usb_device *dev = NULL;
 526
 527         down(&usb_device_class->sem);
 528         list_for_each_entry(class_dev, &usb_device_class->children, node) {
 529                 if (class_dev->devt == MKDEV(USB_DEVICE_MAJOR, minor)) {
 530                         dev = class_dev->class_data;
 531                         break;
 532                 }
 533         }
 534         up(&usb_device_class->sem);
 535
 536         return dev;
 537 };
 538
 539 /*
 540  * file operations
 541  */
 542 static int usbdev_open(struct inode *inode, struct file *file)
 543 {
 544         struct usb_device *dev = NULL;
 545         struct dev_state *ps;
 546         int ret;
 547
 548         /* Protect against simultaneous removal or release */
 549         mutex_lock(&usbfs_mutex);
 550
 551         ret = -ENOMEM;
 552         if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
 553                 goto out;
 554
 555         ret = -ENOENT;
 556         /* check if we are called from a real node or usbfs */
 557         if (imajor(inode) == USB_DEVICE_MAJOR)
 558                 dev = usbdev_lookup_minor(iminor(inode));
 559         if (!dev)
 560                 dev = inode->i_private;
 561         if (!dev) {
 562                 kfree(ps);
 563                 goto out;
 564         }
 565         usb_get_dev(dev);
 566         ret = 0;
 567         ps->dev = dev;
 568         ps->file = file;
 569         spin_lock_init(&ps->lock);
 570         INIT_LIST_HEAD(&ps->async_pending);
 571         INIT_LIST_HEAD(&ps->async_completed);
 572         init_waitqueue_head(&ps->wait);
 573         ps->discsignr = 0;
 574         ps->disc_pid = current->pid;
 575         ps->disc_uid = current->uid;
 576         ps->disc_euid = current->euid;
 577         ps->disccontext = NULL;
 578         ps->ifclaimed = 0;
 579         security_task_getsecid(current, &ps->secid);
 580         wmb();
 581         list_add_tail(&ps->list, &dev->filelist);
 582         file->private_data = ps;
 583  out:
 584         mutex_unlock(&usbfs_mutex);
 585         return ret;
 586 }
 587
 588 static int usbdev_release(struct inode *inode, struct file *file)
 589 {
 590         struct dev_state *ps = (struct dev_state *)file->private_data;
 591         struct usb_device *dev = ps->dev;
 592         unsigned int ifnum;
 593
 594         usb_lock_device(dev);
 595
 596         /* Protect against simultaneous open */
 597         mutex_lock(&usbfs_mutex);
 598         list_del_init(&ps->list);
 599         mutex_unlock(&usbfs_mutex);
 600
 601         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 602                         ifnum++) {
 603                 if (test_bit(ifnum, &ps->ifclaimed))
 604                         releaseintf(ps, ifnum);
 605         }
 606         destroy_all_async(ps);
 607         usb_unlock_device(dev);
 608         usb_put_dev(dev);
 609         kfree(ps);
 610         return 0;
 611 }
 612
 613 static int proc_control(struct dev_state *ps, void __user *arg)
 614 {
 615         struct usb_device *dev = ps->dev;
 616         struct usbdevfs_ctrltransfer ctrl;
 617         unsigned int tmo;
 618         unsigned char *tbuf;
 619         int i, j, ret;
 620
 621         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 622                 return -EFAULT;
 623         if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
 624                 return ret;
 625         if (ctrl.wLength > PAGE_SIZE)
 626                 return -EINVAL;
 627         if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
 628                 return -ENOMEM;
 629         tmo = ctrl.timeout;
 630         if (ctrl.bRequestType & 0x80) {
 631                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
 632                         free_page((unsigned long)tbuf);
 633                         return -EINVAL;
 634                 }
 635                 snoop(&dev->dev, "control read: bRequest=%02x "
 636                                 "bRrequestType=%02x wValue=%04x "
 637                                 "wIndex=%04x wLength=%04x\n",
 638                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 639                                 ctrl.wIndex, ctrl.wLength);
 640
 641                 usb_unlock_device(dev);
 642                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 643                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 644                 usb_lock_device(dev);
 645                 if ((i > 0) && ctrl.wLength) {
 646                         if (usbfs_snoop) {
 647                                 dev_info(&dev->dev, "control read: data ");
 648                                 for (j = 0; j < i; ++j)
 649                                         printk("%02x ", (unsigned char)(tbuf)[j]);
 650                                 printk("\n");
 651                         }
 652                         if (copy_to_user(ctrl.data, tbuf, i)) {
 653                                 free_page((unsigned long)tbuf);
 654                                 return -EFAULT;
 655                         }
 656                 }
 657         } else {
 658                 if (ctrl.wLength) {
 659                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 660                                 free_page((unsigned long)tbuf);
 661                                 return -EFAULT;
 662                         }
 663                 }
 664                 snoop(&dev->dev, "control write: bRequest=%02x "
 665                                 "bRrequestType=%02x wValue=%04x "
 666                                 "wIndex=%04x wLength=%04x\n",
 667                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 668                                 ctrl.wIndex, ctrl.wLength);
 669                 if (usbfs_snoop) {
 670                         dev_info(&dev->dev, "control write: data: ");
 671                         for (j = 0; j < ctrl.wLength; ++j)
 672                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 673                         printk("\n");
 674                 }
 675                 usb_unlock_device(dev);
 676                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 677                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 678                 usb_lock_device(dev);
 679         }
 680         free_page((unsigned long)tbuf);
 681         if (i<0 && i != -EPIPE) {
 682                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 683                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 684                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 685                            ctrl.wLength, i);
 686         }
 687         return i;
 688 }
 689
 690 static int proc_bulk(struct dev_state *ps, void __user *arg)
 691 {
 692         struct usb_device *dev = ps->dev;
 693         struct usbdevfs_bulktransfer bulk;
 694         unsigned int tmo, len1, pipe;
 695         int len2;
 696         unsigned char *tbuf;
 697         int i, j, ret;
 698
 699         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 700                 return -EFAULT;
 701         if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
 702                 return ret;
 703         if ((ret = checkintf(ps, ret)))
 704                 return ret;
 705         if (bulk.ep & USB_DIR_IN)
 706                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 707         else
 708                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 709         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 710                 return -EINVAL;
 711         len1 = bulk.len;
 712         if (len1 > MAX_USBFS_BUFFER_SIZE)
 713                 return -EINVAL;
 714         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 715                 return -ENOMEM;
 716         tmo = bulk.timeout;
 717         if (bulk.ep & 0x80) {
 718                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 719                         kfree(tbuf);
 720                         return -EINVAL;
 721                 }
 722                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
 723                         bulk.len, bulk.timeout);
 724                 usb_unlock_device(dev);
 725                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 726                 usb_lock_device(dev);
 727                 if (!i && len2) {
 728                         if (usbfs_snoop) {
 729                                 dev_info(&dev->dev, "bulk read: data ");
 730                                 for (j = 0; j < len2; ++j)
 731                                         printk("%02x ", (unsigned char)(tbuf)[j]);
 732                                 printk("\n");
 733                         }
 734                         if (copy_to_user(bulk.data, tbuf, len2)) {
 735                                 kfree(tbuf);
 736                                 return -EFAULT;
 737                         }
 738                 }
 739         } else {
 740                 if (len1) {
 741                         if (copy_from_user(tbuf, bulk.data, len1)) {
 742                                 kfree(tbuf);
 743                                 return -EFAULT;
 744                         }
 745                 }
 746                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
 747                         bulk.len, bulk.timeout);
 748                 if (usbfs_snoop) {
 749                         dev_info(&dev->dev, "bulk write: data: ");
 750                         for (j = 0; j < len1; ++j)
 751                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 752                         printk("\n");
 753                 }
 754                 usb_unlock_device(dev);
 755                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 756                 usb_lock_device(dev);
 757         }
 758         kfree(tbuf);
 759         if (i < 0)
 760                 return i;
 761         return len2;
 762 }
 763
 764 static int proc_resetep(struct dev_state *ps, void __user *arg)
 765 {
 766         unsigned int ep;
 767         int ret;
 768
 769         if (get_user(ep, (unsigned int __user *)arg))
 770                 return -EFAULT;
 771         if ((ret = findintfep(ps->dev, ep)) < 0)
 772                 return ret;
 773         if ((ret = checkintf(ps, ret)))
 774                 return ret;
 775         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
 776         return 0;
 777 }
 778
 779 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 780 {
 781         unsigned int ep;
 782         int pipe;
 783         int ret;
 784
 785         if (get_user(ep, (unsigned int __user *)arg))
 786                 return -EFAULT;
 787         if ((ret = findintfep(ps->dev, ep)) < 0)
 788                 return ret;
 789         if ((ret = checkintf(ps, ret)))
 790                 return ret;
 791         if (ep & USB_DIR_IN)
 792                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 793         else
 794                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 795
 796         return usb_clear_halt(ps->dev, pipe);
 797 }
 798
 799
 800 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 801 {
 802         struct usbdevfs_getdriver gd;
 803         struct usb_interface *intf;
 804         int ret;
 805
 806         if (copy_from_user(&gd, arg, sizeof(gd)))
 807                 return -EFAULT;
 808         down_read(&usb_bus_type.subsys.rwsem);
 809         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 810         if (!intf || !intf->dev.driver)
 811                 ret = -ENODATA;
 812         else {
 813                 strncpy(gd.driver, intf->dev.driver->name,
 814                                 sizeof(gd.driver));
 815                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 816         }
 817         up_read(&usb_bus_type.subsys.rwsem);
 818         return ret;
 819 }
 820
 821 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 822 {
 823         struct usbdevfs_connectinfo ci;
 824
 825         ci.devnum = ps->dev->devnum;
 826         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 827         if (copy_to_user(arg, &ci, sizeof(ci)))
 828                 return -EFAULT;
 829         return 0;
 830 }
 831
 832 static int proc_resetdevice(struct dev_state *ps)
 833 {
 834         return usb_reset_composite_device(ps->dev, NULL);
 835 }
 836
 837 static int proc_setintf(struct dev_state *ps, void __user *arg)
 838 {
 839         struct usbdevfs_setinterface setintf;
 840         int ret;
 841
 842         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 843                 return -EFAULT;
 844         if ((ret = checkintf(ps, setintf.interface)))
 845                 return ret;
 846         return usb_set_interface(ps->dev, setintf.interface,
 847                         setintf.altsetting);
 848 }
 849
 850 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 851 {
 852         unsigned int u;
 853         int status = 0;
 854         struct usb_host_config *actconfig;
 855
 856         if (get_user(u, (unsigned int __user *)arg))
 857                 return -EFAULT;
 858
 859         actconfig = ps->dev->actconfig;
 860
 861         /* Don't touch the device if any interfaces are claimed.
 862          * It could interfere with other drivers' operations, and if
 863          * an interface is claimed by usbfs it could easily deadlock.
 864          */
 865         if (actconfig) {
 866                 int i;
 867
 868                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 869                         if (usb_interface_claimed(actconfig->interface[i])) {
 870                                 dev_warn (&ps->dev->dev,
 871                                         "usbfs: interface %d claimed by %s "
 872                                         "while '%s' sets config #%d\n",
 873                                         actconfig->interface[i]
 874                                                 ->cur_altsetting
 875                                                 ->desc.bInterfaceNumber,
 876                                         actconfig->interface[i]
 877                                                 ->dev.driver->name,
 878                                         current->comm, u);
 879                                 status = -EBUSY;
 880                                 break;
 881                         }
 882                 }
 883         }
 884
 885         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 886          * so avoid usb_set_configuration()'s kick to sysfs
 887          */
 888         if (status == 0) {
 889                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 890                         status = usb_reset_configuration(ps->dev);
 891                 else
 892                         status = usb_set_configuration(ps->dev, u);
 893         }
 894
 895         return status;
 896 }
 897
 898 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 899                              struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
 900                              void __user *arg)
 901 {
 902         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 903         struct usb_host_endpoint *ep;
 904         struct async *as;
 905         struct usb_ctrlrequest *dr = NULL;
 906         unsigned int u, totlen, isofrmlen;
 907         int ret, interval = 0, ifnum = -1;
 908
 909         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
 910                            URB_NO_FSBR|URB_ZERO_PACKET))
 911                 return -EINVAL;
 912         if (!uurb->buffer)
 913                 return -EINVAL;
 914         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
 915                 return -EINVAL;
 916         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
 917                 if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
 918                         return ifnum;
 919                 if ((ret = checkintf(ps, ifnum)))
 920                         return ret;
 921         }
 922         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0)
 923                 ep = ps->dev->ep_in [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 924         else
 925                 ep = ps->dev->ep_out [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 926         if (!ep)
 927                 return -ENOENT;
 928         switch(uurb->type) {
 929         case USBDEVFS_URB_TYPE_CONTROL:
 930                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 931                                 != USB_ENDPOINT_XFER_CONTROL)
 932                         return -EINVAL;
 933                 /* min 8 byte setup packet, max 8 byte setup plus an arbitrary data stage */
 934                 if (uurb->buffer_length < 8 || uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
 935                         return -EINVAL;
 936                 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
 937                         return -ENOMEM;
 938                 if (copy_from_user(dr, uurb->buffer, 8)) {
 939                         kfree(dr);
 940                         return -EFAULT;
 941                 }
 942                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
 943                         kfree(dr);
 944                         return -EINVAL;
 945                 }
 946                 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
 947                         kfree(dr);
 948                         return ret;
 949                 }
 950                 uurb->endpoint = (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK);
 951                 uurb->number_of_packets = 0;
 952                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
 953                 uurb->buffer += 8;
 954                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ?  VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) {
 955                         kfree(dr);
 956                         return -EFAULT;
 957                 }
 958                 snoop(&ps->dev->dev, "control urb\n");
 959                 break;
 960
 961         case USBDEVFS_URB_TYPE_BULK:
 962                 switch (ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 963                 case USB_ENDPOINT_XFER_CONTROL:
 964                 case USB_ENDPOINT_XFER_ISOC:
 965                         return -EINVAL;
 966                 /* allow single-shot interrupt transfers, at bogus rates */
 967                 }
 968                 uurb->number_of_packets = 0;
 969                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
 970                         return -EINVAL;
 971                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
 972                         return -EFAULT;
 973                 snoop(&ps->dev->dev, "bulk urb\n");
 974                 break;
 975
 976         case USBDEVFS_URB_TYPE_ISO:
 977                 /* arbitrary limit */
 978                 if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
 979                         return -EINVAL;
 980                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 981                                 != USB_ENDPOINT_XFER_ISOC)
 982                         return -EINVAL;
 983                 interval = 1 << min (15, ep->desc.bInterval - 1);
 984                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
 985                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
 986                         return -ENOMEM;
 987                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
 988                         kfree(isopkt);
 989                         return -EFAULT;
 990                 }
 991                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
 992                         /* arbitrary limit, sufficient for USB 2.0 high-bandwidth iso */
 993                         if (isopkt[u].length > 8192) {
 994                                 kfree(isopkt);
 995                                 return -EINVAL;
 996                         }
 997                         totlen += isopkt[u].length;
 998                 }
 999                 if (totlen > 32768) {
1000                         kfree(isopkt);
1001                         return -EINVAL;
1002                 }
1003                 uurb->buffer_length = totlen;
1004                 snoop(&ps->dev->dev, "iso urb\n");
1005                 break;
1006
1007         case USBDEVFS_URB_TYPE_INTERRUPT:
1008                 uurb->number_of_packets = 0;
1009                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
1010                                 != USB_ENDPOINT_XFER_INT)
1011                         return -EINVAL;
1012                 if (ps->dev->speed == USB_SPEED_HIGH)
1013                         interval = 1 << min (15, ep->desc.bInterval - 1);
1014                 else
1015                         interval = ep->desc.bInterval;
1016                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1017                         return -EINVAL;
1018                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
1019                         return -EFAULT;
1020                 snoop(&ps->dev->dev, "interrupt urb\n");
1021                 break;
1022
1023         default:
1024                 return -EINVAL;
1025         }
1026         if (!(as = alloc_async(uurb->number_of_packets))) {
1027                 kfree(isopkt);
1028                 kfree(dr);
1029                 return -ENOMEM;
1030         }
1031         if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
1032                 kfree(isopkt);
1033                 kfree(dr);
1034                 free_async(as);
1035                 return -ENOMEM;
1036         }
1037         as->urb->dev = ps->dev;
1038         as->urb->pipe = (uurb->type << 30) | __create_pipe(ps->dev, uurb->endpoint & 0xf) | (uurb->endpoint & USB_DIR_IN);
1039         as->urb->transfer_flags = uurb->flags;
1040         as->urb->transfer_buffer_length = uurb->buffer_length;
1041         as->urb->setup_packet = (unsigned char*)dr;
1042         as->urb->start_frame = uurb->start_frame;
1043         as->urb->number_of_packets = uurb->number_of_packets;
1044         as->urb->interval = interval;
1045         as->urb->context = as;
1046         as->urb->complete = async_completed;
1047         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1048                 as->urb->iso_frame_desc[u].offset = totlen;
1049                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1050                 totlen += isopkt[u].length;
1051         }
1052         kfree(isopkt);
1053         as->ps = ps;
1054         as->userurb = arg;
1055         if (uurb->endpoint & USB_DIR_IN)
1056                 as->userbuffer = uurb->buffer;
1057         else
1058                 as->userbuffer = NULL;
1059         as->signr = uurb->signr;
1060         as->ifnum = ifnum;
1061         as->pid = current->pid;
1062         as->uid = current->uid;
1063         as->euid = current->euid;
1064         security_task_getsecid(current, &as->secid);
1065         if (!(uurb->endpoint & USB_DIR_IN)) {
1066                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, as->urb->transfer_buffer_length)) {
1067                         free_async(as);
1068                         return -EFAULT;
1069                 }
1070         }
1071         snoop(&as->urb->dev->dev, "submit urb\n");
1072         snoop_urb(as->urb, as->userurb);
1073         async_newpending(as);
1074         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1075                 dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
1076                 async_removepending(as);
1077                 free_async(as);
1078                 return ret;
1079         }
1080         return 0;
1081 }
1082
1083 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1084 {
1085         struct usbdevfs_urb uurb;
1086
1087         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1088                 return -EFAULT;
1089
1090         return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg);
1091 }
1092
1093 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1094 {
1095         struct async *as;
1096
1097         as = async_getpending(ps, arg);
1098         if (!as)
1099                 return -EINVAL;
1100         usb_kill_urb(as->urb);
1101         return 0;
1102 }
1103
1104 static int processcompl(struct async *as, void __user * __user *arg)
1105 {
1106         struct urb *urb = as->urb;
1107         struct usbdevfs_urb __user *userurb = as->userurb;
1108         void __user *addr = as->userurb;
1109         unsigned int i;
1110
1111         if (as->userbuffer)
1112                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1113                         return -EFAULT;
1114         if (put_user(urb->status, &userurb->status))
1115                 return -EFAULT;
1116         if (put_user(urb->actual_length, &userurb->actual_length))
1117                 return -EFAULT;
1118         if (put_user(urb->error_count, &userurb->error_count))
1119                 return -EFAULT;
1120
1121         if (usb_pipeisoc(urb->pipe)) {
1122                 for (i = 0; i < urb->number_of_packets; i++) {
1123                         if (put_user(urb->iso_frame_desc[i].actual_length,
1124                                      &userurb->iso_frame_desc[i].actual_length))
1125                                 return -EFAULT;
1126                         if (put_user(urb->iso_frame_desc[i].status,
1127                                      &userurb->iso_frame_desc[i].status))
1128                                 return -EFAULT;
1129                 }
1130         }
1131
1132         free_async(as);
1133
1134         if (put_user(addr, (void __user * __user *)arg))
1135                 return -EFAULT;
1136         return 0;
1137 }
1138
1139 static struct async* reap_as(struct dev_state *ps)
1140 {
1141         DECLARE_WAITQUEUE(wait, current);
1142         struct async *as = NULL;
1143         struct usb_device *dev = ps->dev;
1144
1145         add_wait_queue(&ps->wait, &wait);
1146         for (;;) {
1147                 __set_current_state(TASK_INTERRUPTIBLE);
1148                 if ((as = async_getcompleted(ps)))
1149                         break;
1150                 if (signal_pending(current))
1151                         break;
1152                 usb_unlock_device(dev);
1153                 schedule();
1154                 usb_lock_device(dev);
1155         }
1156         remove_wait_queue(&ps->wait, &wait);
1157         set_current_state(TASK_RUNNING);
1158         return as;
1159 }
1160
1161 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1162 {
1163         struct async *as = reap_as(ps);
1164         if (as)
1165                 return processcompl(as, (void __user * __user *)arg);
1166         if (signal_pending(current))
1167                 return -EINTR;
1168         return -EIO;
1169 }
1170
1171 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1172 {
1173         struct async *as;
1174
1175         if (!(as = async_getcompleted(ps)))
1176                 return -EAGAIN;
1177         return processcompl(as, (void __user * __user *)arg);
1178 }
1179
1180 #ifdef CONFIG_COMPAT
1181
1182 static int get_urb32(struct usbdevfs_urb *kurb,
1183                      struct usbdevfs_urb32 __user *uurb)
1184 {
1185         __u32  uptr;
1186         if (get_user(kurb->type, &uurb->type) ||
1187             __get_user(kurb->endpoint, &uurb->endpoint) ||
1188             __get_user(kurb->status, &uurb->status) ||
1189             __get_user(kurb->flags, &uurb->flags) ||
1190             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1191             __get_user(kurb->actual_length, &uurb->actual_length) ||
1192             __get_user(kurb->start_frame, &uurb->start_frame) ||
1193             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1194             __get_user(kurb->error_count, &uurb->error_count) ||
1195             __get_user(kurb->signr, &uurb->signr))
1196                 return -EFAULT;
1197
1198         if (__get_user(uptr, &uurb->buffer))
1199                 return -EFAULT;
1200         kurb->buffer = compat_ptr(uptr);
1201         if (__get_user(uptr, &uurb->buffer))
1202                 return -EFAULT;
1203         kurb->usercontext = compat_ptr(uptr);
1204
1205         return 0;
1206 }
1207
1208 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1209 {
1210         struct usbdevfs_urb uurb;
1211
1212         if (get_urb32(&uurb,(struct usbdevfs_urb32 *)arg))
1213                 return -EFAULT;
1214
1215         return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg);
1216 }
1217
1218 static int processcompl_compat(struct async *as, void __user * __user *arg)
1219 {
1220         struct urb *urb = as->urb;
1221         struct usbdevfs_urb32 __user *userurb = as->userurb;
1222         void __user *addr = as->userurb;
1223         unsigned int i;
1224
1225         if (as->userbuffer)
1226                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1227                         return -EFAULT;
1228         if (put_user(urb->status, &userurb->status))
1229                 return -EFAULT;
1230         if (put_user(urb->actual_length, &userurb->actual_length))
1231                 return -EFAULT;
1232         if (put_user(urb->error_count, &userurb->error_count))
1233                 return -EFAULT;
1234
1235         if (usb_pipeisoc(urb->pipe)) {
1236                 for (i = 0; i < urb->number_of_packets; i++) {
1237                         if (put_user(urb->iso_frame_desc[i].actual_length,
1238                                      &userurb->iso_frame_desc[i].actual_length))
1239                                 return -EFAULT;
1240                         if (put_user(urb->iso_frame_desc[i].status,
1241                                      &userurb->iso_frame_desc[i].status))
1242                                 return -EFAULT;
1243                 }
1244         }
1245
1246         free_async(as);
1247         if (put_user((u32)(u64)addr, (u32 __user *)arg))
1248                 return -EFAULT;
1249         return 0;
1250 }
1251
1252 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1253 {
1254         struct async *as = reap_as(ps);
1255         if (as)
1256                 return processcompl_compat(as, (void __user * __user *)arg);
1257         if (signal_pending(current))
1258                 return -EINTR;
1259         return -EIO;
1260 }
1261
1262 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1263 {
1264         struct async *as;
1265
1266         if (!(as = async_getcompleted(ps)))
1267                 return -EAGAIN;
1268         return processcompl_compat(as, (void __user * __user *)arg);
1269 }
1270
1271 #endif
1272
1273 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1274 {
1275         struct usbdevfs_disconnectsignal ds;
1276
1277         if (copy_from_user(&ds, arg, sizeof(ds)))
1278                 return -EFAULT;
1279         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1280                 return -EINVAL;
1281         ps->discsignr = ds.signr;
1282         ps->disccontext = ds.context;
1283         return 0;
1284 }
1285
1286 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1287 {
1288         unsigned int ifnum;
1289
1290         if (get_user(ifnum, (unsigned int __user *)arg))
1291                 return -EFAULT;
1292         return claimintf(ps, ifnum);
1293 }
1294
1295 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1296 {
1297         unsigned int ifnum;
1298         int ret;
1299
1300         if (get_user(ifnum, (unsigned int __user *)arg))
1301                 return -EFAULT;
1302         if ((ret = releaseintf(ps, ifnum)) < 0)
1303                 return ret;
1304         destroy_async_on_interface (ps, ifnum);
1305         return 0;
1306 }
1307
1308 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1309 {
1310         int                     size;
1311         void                    *buf = NULL;
1312         int                     retval = 0;
1313         struct usb_interface    *intf = NULL;
1314         struct usb_driver       *driver = NULL;
1315
1316         /* alloc buffer */
1317         if ((size = _IOC_SIZE (ctl->ioctl_code)) > 0) {
1318                 if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
1319                         return -ENOMEM;
1320                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1321                         if (copy_from_user (buf, ctl->data, size)) {
1322                                 kfree(buf);
1323                                 return -EFAULT;
1324                         }
1325                 } else {
1326                         memset (buf, 0, size);
1327                 }
1328         }
1329
1330         if (!connected(ps)) {
1331                 kfree(buf);
1332                 return -ENODEV;
1333         }
1334
1335         if (ps->dev->state != USB_STATE_CONFIGURED)
1336                 retval = -EHOSTUNREACH;
1337         else if (!(intf = usb_ifnum_to_if (ps->dev, ctl->ifno)))
1338                retval = -EINVAL;
1339         else switch (ctl->ioctl_code) {
1340
1341         /* disconnect kernel driver from interface */
1342         case USBDEVFS_DISCONNECT:
1343
1344                 down_write(&usb_bus_type.subsys.rwsem);
1345                 if (intf->dev.driver) {
1346                         driver = to_usb_driver(intf->dev.driver);
1347                         dev_dbg (&intf->dev, "disconnect by usbfs\n");
1348                         usb_driver_release_interface(driver, intf);
1349                 } else
1350                         retval = -ENODATA;
1351                 up_write(&usb_bus_type.subsys.rwsem);
1352                 break;
1353
1354         /* let kernel drivers try to (re)bind to the interface */
1355         case USBDEVFS_CONNECT:
1356                 usb_unlock_device(ps->dev);
1357                 bus_rescan_devices(intf->dev.bus);
1358                 usb_lock_device(ps->dev);
1359                 break;
1360
1361         /* talk directly to the interface's driver */
1362         default:
1363                 down_read(&usb_bus_type.subsys.rwsem);
1364                 if (intf->dev.driver)
1365                         driver = to_usb_driver(intf->dev.driver);
1366                 if (driver == NULL || driver->ioctl == NULL) {
1367                         retval = -ENOTTY;
1368                 } else {
1369                         retval = driver->ioctl (intf, ctl->ioctl_code, buf);
1370                         if (retval == -ENOIOCTLCMD)
1371                                 retval = -ENOTTY;
1372                 }
1373                 up_read(&usb_bus_type.subsys.rwsem);
1374         }
1375
1376         /* cleanup and return */
1377         if (retval >= 0
1378                         && (_IOC_DIR (ctl->ioctl_code) & _IOC_READ) != 0
1379                         && size > 0
1380                         && copy_to_user (ctl->data, buf, size) != 0)
1381                 retval = -EFAULT;
1382
1383         kfree(buf);
1384         return retval;
1385 }
1386
1387 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1388 {
1389         struct usbdevfs_ioctl   ctrl;
1390
1391         if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
1392                 return -EFAULT;
1393         return proc_ioctl(ps, &ctrl);
1394 }
1395
1396 #ifdef CONFIG_COMPAT
1397 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1398 {
1399         struct usbdevfs_ioctl32 __user *uioc;
1400         struct usbdevfs_ioctl ctrl;
1401         u32 udata;
1402
1403         uioc = compat_ptr((long)arg);
1404         if (get_user(ctrl.ifno, &uioc->ifno) ||
1405             get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1406             __get_user(udata, &uioc->data))
1407                 return -EFAULT;
1408         ctrl.data = compat_ptr(udata);
1409
1410         return proc_ioctl(ps, &ctrl);
1411 }
1412 #endif
1413
1414 /*
1415  * NOTE:  All requests here that have interface numbers as parameters
1416  * are assuming that somehow the configuration has been prevented from
1417  * changing.  But there's no mechanism to ensure that...
1418  */
1419 static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1420 {
1421         struct dev_state *ps = (struct dev_state *)file->private_data;
1422         struct usb_device *dev = ps->dev;
1423         void __user *p = (void __user *)arg;
1424         int ret = -ENOTTY;
1425
1426         if (!(file->f_mode & FMODE_WRITE))
1427                 return -EPERM;
1428         usb_lock_device(dev);
1429         if (!connected(ps)) {
1430                 usb_unlock_device(dev);
1431                 return -ENODEV;
1432         }
1433
1434         switch (cmd) {
1435         case USBDEVFS_CONTROL:
1436                 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
1437                 ret = proc_control(ps, p);
1438                 if (ret >= 0)
1439                         inode->i_mtime = CURRENT_TIME;
1440                 break;
1441
1442         case USBDEVFS_BULK:
1443                 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
1444                 ret = proc_bulk(ps, p);
1445                 if (ret >= 0)
1446                         inode->i_mtime = CURRENT_TIME;
1447                 break;
1448
1449         case USBDEVFS_RESETEP:
1450                 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
1451                 ret = proc_resetep(ps, p);
1452                 if (ret >= 0)
1453                         inode->i_mtime = CURRENT_TIME;
1454                 break;
1455
1456         case USBDEVFS_RESET:
1457                 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
1458                 ret = proc_resetdevice(ps);
1459                 break;
1460
1461         case USBDEVFS_CLEAR_HALT:
1462                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
1463                 ret = proc_clearhalt(ps, p);
1464                 if (ret >= 0)
1465                         inode->i_mtime = CURRENT_TIME;
1466                 break;
1467
1468         case USBDEVFS_GETDRIVER:
1469                 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
1470                 ret = proc_getdriver(ps, p);
1471                 break;
1472
1473         case USBDEVFS_CONNECTINFO:
1474                 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
1475                 ret = proc_connectinfo(ps, p);
1476                 break;
1477
1478         case USBDEVFS_SETINTERFACE:
1479                 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
1480                 ret = proc_setintf(ps, p);
1481                 break;
1482
1483         case USBDEVFS_SETCONFIGURATION:
1484                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
1485                 ret = proc_setconfig(ps, p);
1486                 break;
1487
1488         case USBDEVFS_SUBMITURB:
1489                 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
1490                 ret = proc_submiturb(ps, p);
1491                 if (ret >= 0)
1492                         inode->i_mtime = CURRENT_TIME;
1493                 break;
1494
1495 #ifdef CONFIG_COMPAT
1496
1497         case USBDEVFS_SUBMITURB32:
1498                 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
1499                 ret = proc_submiturb_compat(ps, p);
1500                 if (ret >= 0)
1501                         inode->i_mtime = CURRENT_TIME;
1502                 break;
1503
1504         case USBDEVFS_REAPURB32:
1505                 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
1506                 ret = proc_reapurb_compat(ps, p);
1507                 break;
1508
1509         case USBDEVFS_REAPURBNDELAY32:
1510                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
1511                 ret = proc_reapurbnonblock_compat(ps, p);
1512                 break;
1513
1514         case USBDEVFS_IOCTL32:
1515                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1516                 ret = proc_ioctl_compat(ps, (compat_uptr_t)(long)p);
1517                 break;
1518 #endif
1519
1520         case USBDEVFS_DISCARDURB:
1521                 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
1522                 ret = proc_unlinkurb(ps, p);
1523                 break;
1524
1525         case USBDEVFS_REAPURB:
1526                 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
1527                 ret = proc_reapurb(ps, p);
1528                 break;
1529
1530         case USBDEVFS_REAPURBNDELAY:
1531                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
1532                 ret = proc_reapurbnonblock(ps, p);
1533                 break;
1534
1535         case USBDEVFS_DISCSIGNAL:
1536                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
1537                 ret = proc_disconnectsignal(ps, p);
1538                 break;
1539
1540         case USBDEVFS_CLAIMINTERFACE:
1541                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
1542                 ret = proc_claiminterface(ps, p);
1543                 break;
1544
1545         case USBDEVFS_RELEASEINTERFACE:
1546                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
1547                 ret = proc_releaseinterface(ps, p);
1548                 break;
1549
1550         case USBDEVFS_IOCTL:
1551                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1552                 ret = proc_ioctl_default(ps, p);
1553                 break;
1554         }
1555         usb_unlock_device(dev);
1556         if (ret >= 0)
1557                 inode->i_atime = CURRENT_TIME;
1558         return ret;
1559 }
1560
1561 /* No kernel lock - fine */
1562 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
1563 {
1564         struct dev_state *ps = (struct dev_state *)file->private_data;
1565         unsigned int mask = 0;
1566
1567         poll_wait(file, &ps->wait, wait);
1568         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1569                 mask |= POLLOUT | POLLWRNORM;
1570         if (!connected(ps))
1571                 mask |= POLLERR | POLLHUP;
1572         return mask;
1573 }
1574
1575 struct file_operations usbfs_device_file_operations = {
1576         .llseek =       usbdev_lseek,
1577         .read =         usbdev_read,
1578         .poll =         usbdev_poll,
1579         .ioctl =        usbdev_ioctl,
1580         .open =         usbdev_open,
1581         .release =      usbdev_release,
1582 };
1583
1584 static void usbdev_add(struct usb_device *dev)
1585 {
1586         int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1587
1588         dev->class_dev = class_device_create(usb_device_class, NULL,
1589                                 MKDEV(USB_DEVICE_MAJOR, minor), &dev->dev,
1590                                 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1591
1592         dev->class_dev->class_data = dev;
1593 }
1594
1595 static void usbdev_remove(struct usb_device *dev)
1596 {
1597         class_device_unregister(dev->class_dev);
1598 }
1599
1600 static int usbdev_notify(struct notifier_block *self, unsigned long action,
1601                          void *dev)
1602 {
1603         switch (action) {
1604         case USB_DEVICE_ADD:
1605                 usbdev_add(dev);
1606                 break;
1607         case USB_DEVICE_REMOVE:
1608                 usbdev_remove(dev);
1609                 break;
1610         }
1611         return NOTIFY_OK;
1612 }
1613
1614 static struct notifier_block usbdev_nb = {
1615         .notifier_call =        usbdev_notify,
1616 };
1617
1618 static struct cdev usb_device_cdev = {
1619         .kobj   = {.name = "usb_device", },
1620         .owner  = THIS_MODULE,
1621 };
1622
1623 int __init usbdev_init(void)
1624 {
1625         int retval;
1626
1627         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1628                         "usb_device");
1629         if (retval) {
1630                 err("unable to register minors for usb_device");
1631                 goto out;
1632         }
1633         cdev_init(&usb_device_cdev, &usbfs_device_file_operations);
1634         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1635         if (retval) {
1636                 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1637                 goto error_cdev;
1638         }
1639         usb_device_class = class_create(THIS_MODULE, "usb_device");
1640         if (IS_ERR(usb_device_class)) {
1641                 err("unable to register usb_device class");
1642                 retval = PTR_ERR(usb_device_class);
1643                 goto error_class;
1644         }
1645
1646         usb_register_notify(&usbdev_nb);
1647
1648 out:
1649         return retval;
1650
1651 error_class:
1652         usb_device_class = NULL;
1653         cdev_del(&usb_device_cdev);
1654
1655 error_cdev:
1656         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1657         goto out;
1658 }
1659
1660 void usbdev_cleanup(void)
1661 {
1662         usb_unregister_notify(&usbdev_nb);
1663         class_destroy(usb_device_class);
1664         cdev_del(&usb_device_cdev);
1665         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1666 }
1667