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  *  $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
  61 /* Mutual exclusion for removal, open, and release */
  62 DEFINE_MUTEX(usbfs_mutex);
  63
  64 struct async {
  65         struct list_head asynclist;
  66         struct dev_state *ps;
  67         struct pid *pid;
  68         uid_t uid, euid;
  69         unsigned int signr;
  70         unsigned int ifnum;
  71         void __user *userbuffer;
  72         void __user *userurb;
  73         struct urb *urb;
  74         u32 secid;
  75 };
  76
  77 static int usbfs_snoop = 0;
  78 module_param (usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  79 MODULE_PARM_DESC (usbfs_snoop, "true to log all usbfs traffic");
  80
  81 #define snoop(dev, format, arg...)                              \
  82         do {                                                    \
  83                 if (usbfs_snoop)                                \
  84                         dev_info( dev , format , ## arg);       \
  85         } while (0)
  86
  87 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
  88
  89
  90 #define MAX_USBFS_BUFFER_SIZE   16384
  91
  92 static inline int connected (struct dev_state *ps)
  93 {
  94         return (!list_empty(&ps->list) &&
  95                         ps->dev->state != USB_STATE_NOTATTACHED);
  96 }
  97
  98 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
  99 {
 100         loff_t ret;
 101
 102         lock_kernel();
 103
 104         switch (orig) {
 105         case 0:
 106                 file->f_pos = offset;
 107                 ret = file->f_pos;
 108                 break;
 109         case 1:
 110                 file->f_pos += offset;
 111                 ret = file->f_pos;
 112                 break;
 113         case 2:
 114         default:
 115                 ret = -EINVAL;
 116         }
 117
 118         unlock_kernel();
 119         return ret;
 120 }
 121
 122 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
 123 {
 124         struct dev_state *ps = file->private_data;
 125         struct usb_device *dev = ps->dev;
 126         ssize_t ret = 0;
 127         unsigned len;
 128         loff_t pos;
 129         int i;
 130
 131         pos = *ppos;
 132         usb_lock_device(dev);
 133         if (!connected(ps)) {
 134                 ret = -ENODEV;
 135                 goto err;
 136         } else if (pos < 0) {
 137                 ret = -EINVAL;
 138                 goto err;
 139         }
 140
 141         if (pos < sizeof(struct usb_device_descriptor)) {
 142                 struct usb_device_descriptor temp_desc ; /* 18 bytes - fits on the stack */
 143
 144                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 145                 le16_to_cpus(&temp_desc.bcdUSB);
 146                 le16_to_cpus(&temp_desc.idVendor);
 147                 le16_to_cpus(&temp_desc.idProduct);
 148                 le16_to_cpus(&temp_desc.bcdDevice);
 149
 150                 len = sizeof(struct usb_device_descriptor) - pos;
 151                 if (len > nbytes)
 152                         len = nbytes;
 153                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 154                         ret = -EFAULT;
 155                         goto err;
 156                 }
 157
 158                 *ppos += len;
 159                 buf += len;
 160                 nbytes -= len;
 161                 ret += len;
 162         }
 163
 164         pos = sizeof(struct usb_device_descriptor);
 165         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 166                 struct usb_config_descriptor *config =
 167                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 168                 unsigned int length = le16_to_cpu(config->wTotalLength);
 169
 170                 if (*ppos < pos + length) {
 171
 172                         /* The descriptor may claim to be longer than it
 173                          * really is.  Here is the actual allocated length. */
 174                         unsigned alloclen =
 175                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 176
 177                         len = length - (*ppos - pos);
 178                         if (len > nbytes)
 179                                 len = nbytes;
 180
 181                         /* Simply don't write (skip over) unallocated parts */
 182                         if (alloclen > (*ppos - pos)) {
 183                                 alloclen -= (*ppos - pos);
 184                                 if (copy_to_user(buf,
 185                                     dev->rawdescriptors[i] + (*ppos - pos),
 186                                     min(len, alloclen))) {
 187                                         ret = -EFAULT;
 188                                         goto err;
 189                                 }
 190                         }
 191
 192                         *ppos += len;
 193                         buf += len;
 194                         nbytes -= len;
 195                         ret += len;
 196                 }
 197
 198                 pos += length;
 199         }
 200
 201 err:
 202         usb_unlock_device(dev);
 203         return ret;
 204 }
 205
 206 /*
 207  * async list handling
 208  */
 209
 210 static struct async *alloc_async(unsigned int numisoframes)
 211 {
 212         unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor);
 213         struct async *as = kzalloc(assize, GFP_KERNEL);
 214
 215         if (!as)
 216                 return NULL;
 217         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 218         if (!as->urb) {
 219                 kfree(as);
 220                 return NULL;
 221         }
 222         return as;
 223 }
 224
 225 static void free_async(struct async *as)
 226 {
 227         put_pid(as->pid);
 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         dev_info(&urb->dev->dev, "direction=%s\n",
 293                         usb_urb_dir_in(urb) ? "IN" : "OUT");
 294         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
 295         dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
 296                  urb->transfer_buffer_length);
 297         dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
 298         dev_info(&urb->dev->dev, "data: ");
 299         for (j = 0; j < urb->transfer_buffer_length; ++j)
 300                 printk ("%02x ", data[j]);
 301         printk("\n");
 302 }
 303
 304 static void async_completed(struct urb *urb)
 305 {
 306         struct async *as = urb->context;
 307         struct dev_state *ps = as->ps;
 308         struct siginfo sinfo;
 309
 310         spin_lock(&ps->lock);
 311         list_move_tail(&as->asynclist, &ps->async_completed);
 312         spin_unlock(&ps->lock);
 313         if (as->signr) {
 314                 sinfo.si_signo = as->signr;
 315                 sinfo.si_errno = as->urb->status;
 316                 sinfo.si_code = SI_ASYNCIO;
 317                 sinfo.si_addr = as->userurb;
 318                 kill_pid_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
 319                                       as->euid, as->secid);
 320         }
 321         snoop(&urb->dev->dev, "urb complete\n");
 322         snoop_urb(urb, as->userurb);
 323         wake_up(&ps->wait);
 324 }
 325
 326 static void destroy_async (struct dev_state *ps, struct list_head *list)
 327 {
 328         struct async *as;
 329         unsigned long flags;
 330
 331         spin_lock_irqsave(&ps->lock, flags);
 332         while (!list_empty(list)) {
 333                 as = list_entry(list->next, struct async, asynclist);
 334                 list_del_init(&as->asynclist);
 335
 336                 /* drop the spinlock so the completion handler can run */
 337                 spin_unlock_irqrestore(&ps->lock, flags);
 338                 usb_kill_urb(as->urb);
 339                 spin_lock_irqsave(&ps->lock, flags);
 340         }
 341         spin_unlock_irqrestore(&ps->lock, flags);
 342         as = async_getcompleted(ps);
 343         while (as) {
 344                 free_async(as);
 345                 as = async_getcompleted(ps);
 346         }
 347 }
 348
 349 static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum)
 350 {
 351         struct list_head *p, *q, hitlist;
 352         unsigned long flags;
 353
 354         INIT_LIST_HEAD(&hitlist);
 355         spin_lock_irqsave(&ps->lock, flags);
 356         list_for_each_safe(p, q, &ps->async_pending)
 357                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 358                         list_move_tail(p, &hitlist);
 359         spin_unlock_irqrestore(&ps->lock, flags);
 360         destroy_async(ps, &hitlist);
 361 }
 362
 363 static inline void destroy_all_async(struct dev_state *ps)
 364 {
 365                 destroy_async(ps, &ps->async_pending);
 366 }
 367
 368 /*
 369  * interface claims are made only at the request of user level code,
 370  * which can also release them (explicitly or by closing files).
 371  * they're also undone when devices disconnect.
 372  */
 373
 374 static int driver_probe (struct usb_interface *intf,
 375                          const struct usb_device_id *id)
 376 {
 377         return -ENODEV;
 378 }
 379
 380 static void driver_disconnect(struct usb_interface *intf)
 381 {
 382         struct dev_state *ps = usb_get_intfdata (intf);
 383         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 384
 385         if (!ps)
 386                 return;
 387
 388         /* NOTE:  this relies on usbcore having canceled and completed
 389          * all pending I/O requests; 2.6 does that.
 390          */
 391
 392         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 393                 clear_bit(ifnum, &ps->ifclaimed);
 394         else
 395                 warn("interface number %u out of range", ifnum);
 396
 397         usb_set_intfdata (intf, NULL);
 398
 399         /* force async requests to complete */
 400         destroy_async_on_interface(ps, ifnum);
 401 }
 402
 403 struct usb_driver usbfs_driver = {
 404         .name =         "usbfs",
 405         .probe =        driver_probe,
 406         .disconnect =   driver_disconnect,
 407 };
 408
 409 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 410 {
 411         struct usb_device *dev = ps->dev;
 412         struct usb_interface *intf;
 413         int err;
 414
 415         if (ifnum >= 8*sizeof(ps->ifclaimed))
 416                 return -EINVAL;
 417         /* already claimed */
 418         if (test_bit(ifnum, &ps->ifclaimed))
 419                 return 0;
 420
 421         intf = usb_ifnum_to_if(dev, ifnum);
 422         if (!intf)
 423                 err = -ENOENT;
 424         else
 425                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 426         if (err == 0)
 427                 set_bit(ifnum, &ps->ifclaimed);
 428         return err;
 429 }
 430
 431 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 432 {
 433         struct usb_device *dev;
 434         struct usb_interface *intf;
 435         int err;
 436
 437         err = -EINVAL;
 438         if (ifnum >= 8*sizeof(ps->ifclaimed))
 439                 return err;
 440         dev = ps->dev;
 441         intf = usb_ifnum_to_if(dev, ifnum);
 442         if (!intf)
 443                 err = -ENOENT;
 444         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 445                 usb_driver_release_interface(&usbfs_driver, intf);
 446                 err = 0;
 447         }
 448         return err;
 449 }
 450
 451 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 452 {
 453         if (ps->dev->state != USB_STATE_CONFIGURED)
 454                 return -EHOSTUNREACH;
 455         if (ifnum >= 8*sizeof(ps->ifclaimed))
 456                 return -EINVAL;
 457         if (test_bit(ifnum, &ps->ifclaimed))
 458                 return 0;
 459         /* if not yet claimed, claim it for the driver */
 460         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n",
 461                current->pid, current->comm, ifnum);
 462         return claimintf(ps, ifnum);
 463 }
 464
 465 static int findintfep(struct usb_device *dev, unsigned int ep)
 466 {
 467         unsigned int i, j, e;
 468         struct usb_interface *intf;
 469         struct usb_host_interface *alts;
 470         struct usb_endpoint_descriptor *endpt;
 471
 472         if (ep & ~(USB_DIR_IN|0xf))
 473                 return -EINVAL;
 474         if (!dev->actconfig)
 475                 return -ESRCH;
 476         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 477                 intf = dev->actconfig->interface[i];
 478                 for (j = 0; j < intf->num_altsetting; j++) {
 479                         alts = &intf->altsetting[j];
 480                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 481                                 endpt = &alts->endpoint[e].desc;
 482                                 if (endpt->bEndpointAddress == ep)
 483                                         return alts->desc.bInterfaceNumber;
 484                         }
 485                 }
 486         }
 487         return -ENOENT;
 488 }
 489
 490 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
 491 {
 492         int ret = 0;
 493
 494         if (ps->dev->state != USB_STATE_ADDRESS
 495          && ps->dev->state != USB_STATE_CONFIGURED)
 496                 return -EHOSTUNREACH;
 497         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 498                 return 0;
 499
 500         index &= 0xff;
 501         switch (requesttype & USB_RECIP_MASK) {
 502         case USB_RECIP_ENDPOINT:
 503                 if ((ret = findintfep(ps->dev, index)) >= 0)
 504                         ret = checkintf(ps, ret);
 505                 break;
 506
 507         case USB_RECIP_INTERFACE:
 508                 ret = checkintf(ps, index);
 509                 break;
 510         }
 511         return ret;
 512 }
 513
 514 static int __match_minor(struct device *dev, void *data)
 515 {
 516         int minor = *((int *)data);
 517
 518         if (dev->devt == MKDEV(USB_DEVICE_MAJOR, minor))
 519                 return 1;
 520         return 0;
 521 }
 522
 523 static struct usb_device *usbdev_lookup_by_minor(int minor)
 524 {
 525         struct device *dev;
 526
 527         dev = bus_find_device(&usb_bus_type, NULL, &minor, __match_minor);
 528         if (!dev)
 529                 return NULL;
 530         put_device(dev);
 531         return container_of(dev, struct usb_device, dev);
 532 }
 533
 534 /*
 535  * file operations
 536  */
 537 static int usbdev_open(struct inode *inode, struct file *file)
 538 {
 539         struct usb_device *dev = NULL;
 540         struct dev_state *ps;
 541         int ret;
 542
 543         /* Protect against simultaneous removal or release */
 544         mutex_lock(&usbfs_mutex);
 545
 546         ret = -ENOMEM;
 547         if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
 548                 goto out;
 549
 550         ret = -ENOENT;
 551         /* usbdev device-node */
 552         if (imajor(inode) == USB_DEVICE_MAJOR)
 553                 dev = usbdev_lookup_by_minor(iminor(inode));
 554 #ifdef CONFIG_USB_DEVICEFS
 555         /* procfs file */
 556         if (!dev)
 557                 dev = inode->i_private;
 558 #endif
 559         if (!dev)
 560                 goto out;
 561         ret = usb_autoresume_device(dev);
 562         if (ret)
 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->list);
 571         INIT_LIST_HEAD(&ps->async_pending);
 572         INIT_LIST_HEAD(&ps->async_completed);
 573         init_waitqueue_head(&ps->wait);
 574         ps->discsignr = 0;
 575         ps->disc_pid = get_pid(task_pid(current));
 576         ps->disc_uid = current->uid;
 577         ps->disc_euid = current->euid;
 578         ps->disccontext = NULL;
 579         ps->ifclaimed = 0;
 580         security_task_getsecid(current, &ps->secid);
 581         smp_wmb();
 582         list_add_tail(&ps->list, &dev->filelist);
 583         file->private_data = ps;
 584  out:
 585         if (ret)
 586                 kfree(ps);
 587         mutex_unlock(&usbfs_mutex);
 588         return ret;
 589 }
 590
 591 static int usbdev_release(struct inode *inode, struct file *file)
 592 {
 593         struct dev_state *ps = file->private_data;
 594         struct usb_device *dev = ps->dev;
 595         unsigned int ifnum;
 596
 597         usb_lock_device(dev);
 598
 599         /* Protect against simultaneous open */
 600         mutex_lock(&usbfs_mutex);
 601         list_del_init(&ps->list);
 602         mutex_unlock(&usbfs_mutex);
 603
 604         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 605                         ifnum++) {
 606                 if (test_bit(ifnum, &ps->ifclaimed))
 607                         releaseintf(ps, ifnum);
 608         }
 609         destroy_all_async(ps);
 610         usb_autosuspend_device(dev);
 611         usb_unlock_device(dev);
 612         usb_put_dev(dev);
 613         put_pid(ps->disc_pid);
 614         kfree(ps);
 615         return 0;
 616 }
 617
 618 static int proc_control(struct dev_state *ps, void __user *arg)
 619 {
 620         struct usb_device *dev = ps->dev;
 621         struct usbdevfs_ctrltransfer ctrl;
 622         unsigned int tmo;
 623         unsigned char *tbuf;
 624         int i, j, ret;
 625
 626         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 627                 return -EFAULT;
 628         if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
 629                 return ret;
 630         if (ctrl.wLength > PAGE_SIZE)
 631                 return -EINVAL;
 632         if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
 633                 return -ENOMEM;
 634         tmo = ctrl.timeout;
 635         if (ctrl.bRequestType & 0x80) {
 636                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
 637                         free_page((unsigned long)tbuf);
 638                         return -EINVAL;
 639                 }
 640                 snoop(&dev->dev, "control read: bRequest=%02x "
 641                                 "bRrequestType=%02x wValue=%04x "
 642                                 "wIndex=%04x wLength=%04x\n",
 643                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 644                                 ctrl.wIndex, ctrl.wLength);
 645
 646                 usb_unlock_device(dev);
 647                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 648                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 649                 usb_lock_device(dev);
 650                 if ((i > 0) && ctrl.wLength) {
 651                         if (usbfs_snoop) {
 652                                 dev_info(&dev->dev, "control read: data ");
 653                                 for (j = 0; j < i; ++j)
 654                                         printk("%02x ", (unsigned char)(tbuf)[j]);
 655                                 printk("\n");
 656                         }
 657                         if (copy_to_user(ctrl.data, tbuf, i)) {
 658                                 free_page((unsigned long)tbuf);
 659                                 return -EFAULT;
 660                         }
 661                 }
 662         } else {
 663                 if (ctrl.wLength) {
 664                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 665                                 free_page((unsigned long)tbuf);
 666                                 return -EFAULT;
 667                         }
 668                 }
 669                 snoop(&dev->dev, "control write: bRequest=%02x "
 670                                 "bRrequestType=%02x wValue=%04x "
 671                                 "wIndex=%04x wLength=%04x\n",
 672                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 673                                 ctrl.wIndex, ctrl.wLength);
 674                 if (usbfs_snoop) {
 675                         dev_info(&dev->dev, "control write: data: ");
 676                         for (j = 0; j < ctrl.wLength; ++j)
 677                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 678                         printk("\n");
 679                 }
 680                 usb_unlock_device(dev);
 681                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 682                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 683                 usb_lock_device(dev);
 684         }
 685         free_page((unsigned long)tbuf);
 686         if (i<0 && i != -EPIPE) {
 687                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 688                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 689                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 690                            ctrl.wLength, i);
 691         }
 692         return i;
 693 }
 694
 695 static int proc_bulk(struct dev_state *ps, void __user *arg)
 696 {
 697         struct usb_device *dev = ps->dev;
 698         struct usbdevfs_bulktransfer bulk;
 699         unsigned int tmo, len1, pipe;
 700         int len2;
 701         unsigned char *tbuf;
 702         int i, j, ret;
 703
 704         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 705                 return -EFAULT;
 706         if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
 707                 return ret;
 708         if ((ret = checkintf(ps, ret)))
 709                 return ret;
 710         if (bulk.ep & USB_DIR_IN)
 711                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 712         else
 713                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 714         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 715                 return -EINVAL;
 716         len1 = bulk.len;
 717         if (len1 > MAX_USBFS_BUFFER_SIZE)
 718                 return -EINVAL;
 719         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 720                 return -ENOMEM;
 721         tmo = bulk.timeout;
 722         if (bulk.ep & 0x80) {
 723                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 724                         kfree(tbuf);
 725                         return -EINVAL;
 726                 }
 727                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
 728                         bulk.len, bulk.timeout);
 729                 usb_unlock_device(dev);
 730                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 731                 usb_lock_device(dev);
 732                 if (!i && len2) {
 733                         if (usbfs_snoop) {
 734                                 dev_info(&dev->dev, "bulk read: data ");
 735                                 for (j = 0; j < len2; ++j)
 736                                         printk("%02x ", (unsigned char)(tbuf)[j]);
 737                                 printk("\n");
 738                         }
 739                         if (copy_to_user(bulk.data, tbuf, len2)) {
 740                                 kfree(tbuf);
 741                                 return -EFAULT;
 742                         }
 743                 }
 744         } else {
 745                 if (len1) {
 746                         if (copy_from_user(tbuf, bulk.data, len1)) {
 747                                 kfree(tbuf);
 748                                 return -EFAULT;
 749                         }
 750                 }
 751                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
 752                         bulk.len, bulk.timeout);
 753                 if (usbfs_snoop) {
 754                         dev_info(&dev->dev, "bulk write: data: ");
 755                         for (j = 0; j < len1; ++j)
 756                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 757                         printk("\n");
 758                 }
 759                 usb_unlock_device(dev);
 760                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 761                 usb_lock_device(dev);
 762         }
 763         kfree(tbuf);
 764         if (i < 0)
 765                 return i;
 766         return len2;
 767 }
 768
 769 static int proc_resetep(struct dev_state *ps, void __user *arg)
 770 {
 771         unsigned int ep;
 772         int ret;
 773
 774         if (get_user(ep, (unsigned int __user *)arg))
 775                 return -EFAULT;
 776         if ((ret = findintfep(ps->dev, ep)) < 0)
 777                 return ret;
 778         if ((ret = checkintf(ps, ret)))
 779                 return ret;
 780         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
 781         return 0;
 782 }
 783
 784 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 785 {
 786         unsigned int ep;
 787         int pipe;
 788         int ret;
 789
 790         if (get_user(ep, (unsigned int __user *)arg))
 791                 return -EFAULT;
 792         if ((ret = findintfep(ps->dev, ep)) < 0)
 793                 return ret;
 794         if ((ret = checkintf(ps, ret)))
 795                 return ret;
 796         if (ep & USB_DIR_IN)
 797                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 798         else
 799                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 800
 801         return usb_clear_halt(ps->dev, pipe);
 802 }
 803
 804
 805 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 806 {
 807         struct usbdevfs_getdriver gd;
 808         struct usb_interface *intf;
 809         int ret;
 810
 811         if (copy_from_user(&gd, arg, sizeof(gd)))
 812                 return -EFAULT;
 813         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 814         if (!intf || !intf->dev.driver)
 815                 ret = -ENODATA;
 816         else {
 817                 strncpy(gd.driver, intf->dev.driver->name,
 818                                 sizeof(gd.driver));
 819                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 820         }
 821         return ret;
 822 }
 823
 824 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 825 {
 826         struct usbdevfs_connectinfo ci;
 827
 828         ci.devnum = ps->dev->devnum;
 829         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 830         if (copy_to_user(arg, &ci, sizeof(ci)))
 831                 return -EFAULT;
 832         return 0;
 833 }
 834
 835 static int proc_resetdevice(struct dev_state *ps)
 836 {
 837         return usb_reset_composite_device(ps->dev, NULL);
 838 }
 839
 840 static int proc_setintf(struct dev_state *ps, void __user *arg)
 841 {
 842         struct usbdevfs_setinterface setintf;
 843         int ret;
 844
 845         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 846                 return -EFAULT;
 847         if ((ret = checkintf(ps, setintf.interface)))
 848                 return ret;
 849         return usb_set_interface(ps->dev, setintf.interface,
 850                         setintf.altsetting);
 851 }
 852
 853 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 854 {
 855         int u;
 856         int status = 0;
 857         struct usb_host_config *actconfig;
 858
 859         if (get_user(u, (int __user *)arg))
 860                 return -EFAULT;
 861
 862         actconfig = ps->dev->actconfig;
 863
 864         /* Don't touch the device if any interfaces are claimed.
 865          * It could interfere with other drivers' operations, and if
 866          * an interface is claimed by usbfs it could easily deadlock.
 867          */
 868         if (actconfig) {
 869                 int i;
 870
 871                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 872                         if (usb_interface_claimed(actconfig->interface[i])) {
 873                                 dev_warn (&ps->dev->dev,
 874                                         "usbfs: interface %d claimed by %s "
 875                                         "while '%s' sets config #%d\n",
 876                                         actconfig->interface[i]
 877                                                 ->cur_altsetting
 878                                                 ->desc.bInterfaceNumber,
 879                                         actconfig->interface[i]
 880                                                 ->dev.driver->name,
 881                                         current->comm, u);
 882                                 status = -EBUSY;
 883                                 break;
 884                         }
 885                 }
 886         }
 887
 888         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 889          * so avoid usb_set_configuration()'s kick to sysfs
 890          */
 891         if (status == 0) {
 892                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 893                         status = usb_reset_configuration(ps->dev);
 894                 else
 895                         status = usb_set_configuration(ps->dev, u);
 896         }
 897
 898         return status;
 899 }
 900
 901 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 902                              struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
 903                              void __user *arg)
 904 {
 905         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 906         struct usb_host_endpoint *ep;
 907         struct async *as;
 908         struct usb_ctrlrequest *dr = NULL;
 909         unsigned int u, totlen, isofrmlen;
 910         int ret, ifnum = -1;
 911         int is_in;
 912
 913         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
 914                            URB_NO_FSBR|URB_ZERO_PACKET))
 915                 return -EINVAL;
 916         if (!uurb->buffer)
 917                 return -EINVAL;
 918         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
 919                 return -EINVAL;
 920         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
 921                 if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
 922                         return ifnum;
 923                 if ((ret = checkintf(ps, ifnum)))
 924                         return ret;
 925         }
 926         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
 927                 is_in = 1;
 928                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 929         } else {
 930                 is_in = 0;
 931                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 932         }
 933         if (!ep)
 934                 return -ENOENT;
 935         switch(uurb->type) {
 936         case USBDEVFS_URB_TYPE_CONTROL:
 937                 if (!usb_endpoint_xfer_control(&ep->desc))
 938                         return -EINVAL;
 939                 /* min 8 byte setup packet, max 8 byte setup plus an arbitrary data stage */
 940                 if (uurb->buffer_length < 8 || uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
 941                         return -EINVAL;
 942                 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
 943                         return -ENOMEM;
 944                 if (copy_from_user(dr, uurb->buffer, 8)) {
 945                         kfree(dr);
 946                         return -EFAULT;
 947                 }
 948                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
 949                         kfree(dr);
 950                         return -EINVAL;
 951                 }
 952                 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
 953                         kfree(dr);
 954                         return ret;
 955                 }
 956                 uurb->number_of_packets = 0;
 957                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
 958                 uurb->buffer += 8;
 959                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
 960                         is_in = 1;
 961                         uurb->endpoint |= USB_DIR_IN;
 962                 } else {
 963                         is_in = 0;
 964                         uurb->endpoint &= ~USB_DIR_IN;
 965                 }
 966                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
 967                                 uurb->buffer, uurb->buffer_length)) {
 968                         kfree(dr);
 969                         return -EFAULT;
 970                 }
 971                 snoop(&ps->dev->dev, "control urb: bRequest=%02x "
 972                         "bRrequestType=%02x wValue=%04x "
 973                         "wIndex=%04x wLength=%04x\n",
 974                         dr->bRequest, dr->bRequestType,
 975                         __le16_to_cpup(&dr->wValue),
 976                         __le16_to_cpup(&dr->wIndex),
 977                         __le16_to_cpup(&dr->wLength));
 978                 break;
 979
 980         case USBDEVFS_URB_TYPE_BULK:
 981                 switch (usb_endpoint_type(&ep->desc)) {
 982                 case USB_ENDPOINT_XFER_CONTROL:
 983                 case USB_ENDPOINT_XFER_ISOC:
 984                         return -EINVAL;
 985                 /* allow single-shot interrupt transfers, at bogus rates */
 986                 }
 987                 uurb->number_of_packets = 0;
 988                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
 989                         return -EINVAL;
 990                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
 991                                 uurb->buffer, uurb->buffer_length))
 992                         return -EFAULT;
 993                 snoop(&ps->dev->dev, "bulk urb\n");
 994                 break;
 995
 996         case USBDEVFS_URB_TYPE_ISO:
 997                 /* arbitrary limit */
 998                 if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
 999                         return -EINVAL;
1000                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1001                         return -EINVAL;
1002                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
1003                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1004                         return -ENOMEM;
1005                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1006                         kfree(isopkt);
1007                         return -EFAULT;
1008                 }
1009                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1010                         /* arbitrary limit, sufficient for USB 2.0 high-bandwidth iso */
1011                         if (isopkt[u].length > 8192) {
1012                                 kfree(isopkt);
1013                                 return -EINVAL;
1014                         }
1015                         totlen += isopkt[u].length;
1016                 }
1017                 if (totlen > 32768) {
1018                         kfree(isopkt);
1019                         return -EINVAL;
1020                 }
1021                 uurb->buffer_length = totlen;
1022                 snoop(&ps->dev->dev, "iso urb\n");
1023                 break;
1024
1025         case USBDEVFS_URB_TYPE_INTERRUPT:
1026                 uurb->number_of_packets = 0;
1027                 if (!usb_endpoint_xfer_int(&ep->desc))
1028                         return -EINVAL;
1029                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1030                         return -EINVAL;
1031                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1032                                 uurb->buffer, uurb->buffer_length))
1033                         return -EFAULT;
1034                 snoop(&ps->dev->dev, "interrupt urb\n");
1035                 break;
1036
1037         default:
1038                 return -EINVAL;
1039         }
1040         if (!(as = alloc_async(uurb->number_of_packets))) {
1041                 kfree(isopkt);
1042                 kfree(dr);
1043                 return -ENOMEM;
1044         }
1045         if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
1046                 kfree(isopkt);
1047                 kfree(dr);
1048                 free_async(as);
1049                 return -ENOMEM;
1050         }
1051         as->urb->dev = ps->dev;
1052         as->urb->pipe = (uurb->type << 30) |
1053                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1054                         (uurb->endpoint & USB_DIR_IN);
1055         as->urb->transfer_flags = uurb->flags |
1056                         (is_in ? URB_DIR_IN : URB_DIR_OUT);
1057         as->urb->transfer_buffer_length = uurb->buffer_length;
1058         as->urb->setup_packet = (unsigned char*)dr;
1059         as->urb->start_frame = uurb->start_frame;
1060         as->urb->number_of_packets = uurb->number_of_packets;
1061         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1062                         ps->dev->speed == USB_SPEED_HIGH)
1063                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1064         else
1065                 as->urb->interval = ep->desc.bInterval;
1066         as->urb->context = as;
1067         as->urb->complete = async_completed;
1068         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1069                 as->urb->iso_frame_desc[u].offset = totlen;
1070                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1071                 totlen += isopkt[u].length;
1072         }
1073         kfree(isopkt);
1074         as->ps = ps;
1075         as->userurb = arg;
1076         if (uurb->endpoint & USB_DIR_IN)
1077                 as->userbuffer = uurb->buffer;
1078         else
1079                 as->userbuffer = NULL;
1080         as->signr = uurb->signr;
1081         as->ifnum = ifnum;
1082         as->pid = get_pid(task_pid(current));
1083         as->uid = current->uid;
1084         as->euid = current->euid;
1085         security_task_getsecid(current, &as->secid);
1086         if (!is_in) {
1087                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1088                                 as->urb->transfer_buffer_length)) {
1089                         free_async(as);
1090                         return -EFAULT;
1091                 }
1092         }
1093         snoop_urb(as->urb, as->userurb);
1094         async_newpending(as);
1095         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1096                 dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
1097                 async_removepending(as);
1098                 free_async(as);
1099                 return ret;
1100         }
1101         return 0;
1102 }
1103
1104 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1105 {
1106         struct usbdevfs_urb uurb;
1107
1108         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1109                 return -EFAULT;
1110
1111         return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg);
1112 }
1113
1114 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1115 {
1116         struct async *as;
1117
1118         as = async_getpending(ps, arg);
1119         if (!as)
1120                 return -EINVAL;
1121         usb_kill_urb(as->urb);
1122         return 0;
1123 }
1124
1125 static int processcompl(struct async *as, void __user * __user *arg)
1126 {
1127         struct urb *urb = as->urb;
1128         struct usbdevfs_urb __user *userurb = as->userurb;
1129         void __user *addr = as->userurb;
1130         unsigned int i;
1131
1132         if (as->userbuffer)
1133                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1134                         return -EFAULT;
1135         if (put_user(urb->status, &userurb->status))
1136                 return -EFAULT;
1137         if (put_user(urb->actual_length, &userurb->actual_length))
1138                 return -EFAULT;
1139         if (put_user(urb->error_count, &userurb->error_count))
1140                 return -EFAULT;
1141
1142         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1143                 for (i = 0; i < urb->number_of_packets; i++) {
1144                         if (put_user(urb->iso_frame_desc[i].actual_length,
1145                                      &userurb->iso_frame_desc[i].actual_length))
1146                                 return -EFAULT;
1147                         if (put_user(urb->iso_frame_desc[i].status,
1148                                      &userurb->iso_frame_desc[i].status))
1149                                 return -EFAULT;
1150                 }
1151         }
1152
1153         free_async(as);
1154
1155         if (put_user(addr, (void __user * __user *)arg))
1156                 return -EFAULT;
1157         return 0;
1158 }
1159
1160 static struct async* reap_as(struct dev_state *ps)
1161 {
1162         DECLARE_WAITQUEUE(wait, current);
1163         struct async *as = NULL;
1164         struct usb_device *dev = ps->dev;
1165
1166         add_wait_queue(&ps->wait, &wait);
1167         for (;;) {
1168                 __set_current_state(TASK_INTERRUPTIBLE);
1169                 if ((as = async_getcompleted(ps)))
1170                         break;
1171                 if (signal_pending(current))
1172                         break;
1173                 usb_unlock_device(dev);
1174                 schedule();
1175                 usb_lock_device(dev);
1176         }
1177         remove_wait_queue(&ps->wait, &wait);
1178         set_current_state(TASK_RUNNING);
1179         return as;
1180 }
1181
1182 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1183 {
1184         struct async *as = reap_as(ps);
1185         if (as)
1186                 return processcompl(as, (void __user * __user *)arg);
1187         if (signal_pending(current))
1188                 return -EINTR;
1189         return -EIO;
1190 }
1191
1192 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1193 {
1194         struct async *as;
1195
1196         if (!(as = async_getcompleted(ps)))
1197                 return -EAGAIN;
1198         return processcompl(as, (void __user * __user *)arg);
1199 }
1200
1201 #ifdef CONFIG_COMPAT
1202
1203 static int get_urb32(struct usbdevfs_urb *kurb,
1204                      struct usbdevfs_urb32 __user *uurb)
1205 {
1206         __u32  uptr;
1207         if (get_user(kurb->type, &uurb->type) ||
1208             __get_user(kurb->endpoint, &uurb->endpoint) ||
1209             __get_user(kurb->status, &uurb->status) ||
1210             __get_user(kurb->flags, &uurb->flags) ||
1211             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1212             __get_user(kurb->actual_length, &uurb->actual_length) ||
1213             __get_user(kurb->start_frame, &uurb->start_frame) ||
1214             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1215             __get_user(kurb->error_count, &uurb->error_count) ||
1216             __get_user(kurb->signr, &uurb->signr))
1217                 return -EFAULT;
1218
1219         if (__get_user(uptr, &uurb->buffer))
1220                 return -EFAULT;
1221         kurb->buffer = compat_ptr(uptr);
1222         if (__get_user(uptr, &uurb->buffer))
1223                 return -EFAULT;
1224         kurb->usercontext = compat_ptr(uptr);
1225
1226         return 0;
1227 }
1228
1229 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1230 {
1231         struct usbdevfs_urb uurb;
1232
1233         if (get_urb32(&uurb,(struct usbdevfs_urb32 __user *)arg))
1234                 return -EFAULT;
1235
1236         return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg);
1237 }
1238
1239 static int processcompl_compat(struct async *as, void __user * __user *arg)
1240 {
1241         struct urb *urb = as->urb;
1242         struct usbdevfs_urb32 __user *userurb = as->userurb;
1243         void __user *addr = as->userurb;
1244         unsigned int i;
1245
1246         if (as->userbuffer)
1247                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1248                         return -EFAULT;
1249         if (put_user(urb->status, &userurb->status))
1250                 return -EFAULT;
1251         if (put_user(urb->actual_length, &userurb->actual_length))
1252                 return -EFAULT;
1253         if (put_user(urb->error_count, &userurb->error_count))
1254                 return -EFAULT;
1255
1256         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1257                 for (i = 0; i < urb->number_of_packets; i++) {
1258                         if (put_user(urb->iso_frame_desc[i].actual_length,
1259                                      &userurb->iso_frame_desc[i].actual_length))
1260                                 return -EFAULT;
1261                         if (put_user(urb->iso_frame_desc[i].status,
1262                                      &userurb->iso_frame_desc[i].status))
1263                                 return -EFAULT;
1264                 }
1265         }
1266
1267         free_async(as);
1268         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1269                 return -EFAULT;
1270         return 0;
1271 }
1272
1273 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1274 {
1275         struct async *as = reap_as(ps);
1276         if (as)
1277                 return processcompl_compat(as, (void __user * __user *)arg);
1278         if (signal_pending(current))
1279                 return -EINTR;
1280         return -EIO;
1281 }
1282
1283 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1284 {
1285         struct async *as;
1286
1287         if (!(as = async_getcompleted(ps)))
1288                 return -EAGAIN;
1289         return processcompl_compat(as, (void __user * __user *)arg);
1290 }
1291
1292 #endif
1293
1294 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1295 {
1296         struct usbdevfs_disconnectsignal ds;
1297
1298         if (copy_from_user(&ds, arg, sizeof(ds)))
1299                 return -EFAULT;
1300         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1301                 return -EINVAL;
1302         ps->discsignr = ds.signr;
1303         ps->disccontext = ds.context;
1304         return 0;
1305 }
1306
1307 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1308 {
1309         unsigned int ifnum;
1310
1311         if (get_user(ifnum, (unsigned int __user *)arg))
1312                 return -EFAULT;
1313         return claimintf(ps, ifnum);
1314 }
1315
1316 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1317 {
1318         unsigned int ifnum;
1319         int ret;
1320
1321         if (get_user(ifnum, (unsigned int __user *)arg))
1322                 return -EFAULT;
1323         if ((ret = releaseintf(ps, ifnum)) < 0)
1324                 return ret;
1325         destroy_async_on_interface (ps, ifnum);
1326         return 0;
1327 }
1328
1329 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1330 {
1331         int                     size;
1332         void                    *buf = NULL;
1333         int                     retval = 0;
1334         struct usb_interface    *intf = NULL;
1335         struct usb_driver       *driver = NULL;
1336
1337         /* alloc buffer */
1338         if ((size = _IOC_SIZE (ctl->ioctl_code)) > 0) {
1339                 if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
1340                         return -ENOMEM;
1341                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1342                         if (copy_from_user (buf, ctl->data, size)) {
1343                                 kfree(buf);
1344                                 return -EFAULT;
1345                         }
1346                 } else {
1347                         memset (buf, 0, size);
1348                 }
1349         }
1350
1351         if (!connected(ps)) {
1352                 kfree(buf);
1353                 return -ENODEV;
1354         }
1355
1356         if (ps->dev->state != USB_STATE_CONFIGURED)
1357                 retval = -EHOSTUNREACH;
1358         else if (!(intf = usb_ifnum_to_if (ps->dev, ctl->ifno)))
1359                retval = -EINVAL;
1360         else switch (ctl->ioctl_code) {
1361
1362         /* disconnect kernel driver from interface */
1363         case USBDEVFS_DISCONNECT:
1364                 if (intf->dev.driver) {
1365                         driver = to_usb_driver(intf->dev.driver);
1366                         dev_dbg (&intf->dev, "disconnect by usbfs\n");
1367                         usb_driver_release_interface(driver, intf);
1368                 } else
1369                         retval = -ENODATA;
1370                 break;
1371
1372         /* let kernel drivers try to (re)bind to the interface */
1373         case USBDEVFS_CONNECT:
1374                 usb_unlock_device(ps->dev);
1375                 retval = bus_rescan_devices(intf->dev.bus);
1376                 usb_lock_device(ps->dev);
1377                 break;
1378
1379         /* talk directly to the interface's driver */
1380         default:
1381                 if (intf->dev.driver)
1382                         driver = to_usb_driver(intf->dev.driver);
1383                 if (driver == NULL || driver->ioctl == NULL) {
1384                         retval = -ENOTTY;
1385                 } else {
1386                         retval = driver->ioctl (intf, ctl->ioctl_code, buf);
1387                         if (retval == -ENOIOCTLCMD)
1388                                 retval = -ENOTTY;
1389                 }
1390         }
1391
1392         /* cleanup and return */
1393         if (retval >= 0
1394                         && (_IOC_DIR (ctl->ioctl_code) & _IOC_READ) != 0
1395                         && size > 0
1396                         && copy_to_user (ctl->data, buf, size) != 0)
1397                 retval = -EFAULT;
1398
1399         kfree(buf);
1400         return retval;
1401 }
1402
1403 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1404 {
1405         struct usbdevfs_ioctl   ctrl;
1406
1407         if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
1408                 return -EFAULT;
1409         return proc_ioctl(ps, &ctrl);
1410 }
1411
1412 #ifdef CONFIG_COMPAT
1413 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1414 {
1415         struct usbdevfs_ioctl32 __user *uioc;
1416         struct usbdevfs_ioctl ctrl;
1417         u32 udata;
1418
1419         uioc = compat_ptr((long)arg);
1420         if (get_user(ctrl.ifno, &uioc->ifno) ||
1421             get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1422             __get_user(udata, &uioc->data))
1423                 return -EFAULT;
1424         ctrl.data = compat_ptr(udata);
1425
1426         return proc_ioctl(ps, &ctrl);
1427 }
1428 #endif
1429
1430 /*
1431  * NOTE:  All requests here that have interface numbers as parameters
1432  * are assuming that somehow the configuration has been prevented from
1433  * changing.  But there's no mechanism to ensure that...
1434  */
1435 static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1436 {
1437         struct dev_state *ps = file->private_data;
1438         struct usb_device *dev = ps->dev;
1439         void __user *p = (void __user *)arg;
1440         int ret = -ENOTTY;
1441
1442         if (!(file->f_mode & FMODE_WRITE))
1443                 return -EPERM;
1444         usb_lock_device(dev);
1445         if (!connected(ps)) {
1446                 usb_unlock_device(dev);
1447                 return -ENODEV;
1448         }
1449
1450         switch (cmd) {
1451         case USBDEVFS_CONTROL:
1452                 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
1453                 ret = proc_control(ps, p);
1454                 if (ret >= 0)
1455                         inode->i_mtime = CURRENT_TIME;
1456                 break;
1457
1458         case USBDEVFS_BULK:
1459                 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
1460                 ret = proc_bulk(ps, p);
1461                 if (ret >= 0)
1462                         inode->i_mtime = CURRENT_TIME;
1463                 break;
1464
1465         case USBDEVFS_RESETEP:
1466                 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
1467                 ret = proc_resetep(ps, p);
1468                 if (ret >= 0)
1469                         inode->i_mtime = CURRENT_TIME;
1470                 break;
1471
1472         case USBDEVFS_RESET:
1473                 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
1474                 ret = proc_resetdevice(ps);
1475                 break;
1476
1477         case USBDEVFS_CLEAR_HALT:
1478                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
1479                 ret = proc_clearhalt(ps, p);
1480                 if (ret >= 0)
1481                         inode->i_mtime = CURRENT_TIME;
1482                 break;
1483
1484         case USBDEVFS_GETDRIVER:
1485                 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
1486                 ret = proc_getdriver(ps, p);
1487                 break;
1488
1489         case USBDEVFS_CONNECTINFO:
1490                 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
1491                 ret = proc_connectinfo(ps, p);
1492                 break;
1493
1494         case USBDEVFS_SETINTERFACE:
1495                 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
1496                 ret = proc_setintf(ps, p);
1497                 break;
1498
1499         case USBDEVFS_SETCONFIGURATION:
1500                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
1501                 ret = proc_setconfig(ps, p);
1502                 break;
1503
1504         case USBDEVFS_SUBMITURB:
1505                 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
1506                 ret = proc_submiturb(ps, p);
1507                 if (ret >= 0)
1508                         inode->i_mtime = CURRENT_TIME;
1509                 break;
1510
1511 #ifdef CONFIG_COMPAT
1512
1513         case USBDEVFS_SUBMITURB32:
1514                 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
1515                 ret = proc_submiturb_compat(ps, p);
1516                 if (ret >= 0)
1517                         inode->i_mtime = CURRENT_TIME;
1518                 break;
1519
1520         case USBDEVFS_REAPURB32:
1521                 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
1522                 ret = proc_reapurb_compat(ps, p);
1523                 break;
1524
1525         case USBDEVFS_REAPURBNDELAY32:
1526                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
1527                 ret = proc_reapurbnonblock_compat(ps, p);
1528                 break;
1529
1530         case USBDEVFS_IOCTL32:
1531                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1532                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1533                 break;
1534 #endif
1535
1536         case USBDEVFS_DISCARDURB:
1537                 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
1538                 ret = proc_unlinkurb(ps, p);
1539                 break;
1540
1541         case USBDEVFS_REAPURB:
1542                 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
1543                 ret = proc_reapurb(ps, p);
1544                 break;
1545
1546         case USBDEVFS_REAPURBNDELAY:
1547                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
1548                 ret = proc_reapurbnonblock(ps, p);
1549                 break;
1550
1551         case USBDEVFS_DISCSIGNAL:
1552                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
1553                 ret = proc_disconnectsignal(ps, p);
1554                 break;
1555
1556         case USBDEVFS_CLAIMINTERFACE:
1557                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
1558                 ret = proc_claiminterface(ps, p);
1559                 break;
1560
1561         case USBDEVFS_RELEASEINTERFACE:
1562                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
1563                 ret = proc_releaseinterface(ps, p);
1564                 break;
1565
1566         case USBDEVFS_IOCTL:
1567                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1568                 ret = proc_ioctl_default(ps, p);
1569                 break;
1570         }
1571         usb_unlock_device(dev);
1572         if (ret >= 0)
1573                 inode->i_atime = CURRENT_TIME;
1574         return ret;
1575 }
1576
1577 /* No kernel lock - fine */
1578 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
1579 {
1580         struct dev_state *ps = file->private_data;
1581         unsigned int mask = 0;
1582
1583         poll_wait(file, &ps->wait, wait);
1584         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1585                 mask |= POLLOUT | POLLWRNORM;
1586         if (!connected(ps))
1587                 mask |= POLLERR | POLLHUP;
1588         return mask;
1589 }
1590
1591 const struct file_operations usbdev_file_operations = {
1592         .llseek =       usbdev_lseek,
1593         .read =         usbdev_read,
1594         .poll =         usbdev_poll,
1595         .ioctl =        usbdev_ioctl,
1596         .open =         usbdev_open,
1597         .release =      usbdev_release,
1598 };
1599
1600 #ifdef CONFIG_USB_DEVICE_CLASS
1601 static struct class *usb_classdev_class;
1602
1603 static int usb_classdev_add(struct usb_device *dev)
1604 {
1605         int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1606
1607         dev->usb_classdev = device_create(usb_classdev_class, &dev->dev,
1608                                 MKDEV(USB_DEVICE_MAJOR, minor),
1609                                 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1610         if (IS_ERR(dev->usb_classdev))
1611                 return PTR_ERR(dev->usb_classdev);
1612
1613         return 0;
1614 }
1615
1616 static void usb_classdev_remove(struct usb_device *dev)
1617 {
1618         device_unregister(dev->usb_classdev);
1619 }
1620
1621 static int usb_classdev_notify(struct notifier_block *self,
1622                                unsigned long action, void *dev)
1623 {
1624         switch (action) {
1625         case USB_DEVICE_ADD:
1626                 if (usb_classdev_add(dev))
1627                         return NOTIFY_BAD;
1628                 break;
1629         case USB_DEVICE_REMOVE:
1630                 usb_classdev_remove(dev);
1631                 break;
1632         }
1633         return NOTIFY_OK;
1634 }
1635
1636 static struct notifier_block usbdev_nb = {
1637         .notifier_call =        usb_classdev_notify,
1638 };
1639 #endif
1640
1641 static struct cdev usb_device_cdev = {
1642         .kobj   = {.name = "usb_device", },
1643         .owner  = THIS_MODULE,
1644 };
1645
1646 int __init usb_devio_init(void)
1647 {
1648         int retval;
1649
1650         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1651                         "usb_device");
1652         if (retval) {
1653                 err("unable to register minors for usb_device");
1654                 goto out;
1655         }
1656         cdev_init(&usb_device_cdev, &usbdev_file_operations);
1657         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1658         if (retval) {
1659                 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1660                 goto error_cdev;
1661         }
1662 #ifdef CONFIG_USB_DEVICE_CLASS
1663         usb_classdev_class = class_create(THIS_MODULE, "usb_device");
1664         if (IS_ERR(usb_classdev_class)) {
1665                 err("unable to register usb_device class");
1666                 retval = PTR_ERR(usb_classdev_class);
1667                 cdev_del(&usb_device_cdev);
1668                 usb_classdev_class = NULL;
1669                 goto out;
1670         }
1671
1672         usb_register_notify(&usbdev_nb);
1673 #endif
1674 out:
1675         return retval;
1676
1677 error_cdev:
1678         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1679         goto out;
1680 }
1681
1682 void usb_devio_cleanup(void)
1683 {
1684 #ifdef CONFIG_USB_DEVICE_CLASS
1685         usb_unregister_notify(&usbdev_nb);
1686         class_destroy(usb_classdev_class);
1687 #endif
1688         cdev_del(&usb_device_cdev);
1689         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1690 }