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 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         struct pid *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 = 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         put_pid(as->pid);
 229         kfree(as->urb->transfer_buffer);
 230         kfree(as->urb->setup_packet);
 231         usb_free_urb(as->urb);
 232         kfree(as);
 233 }
 234
 235 static inline void async_newpending(struct async *as)
 236 {
 237         struct dev_state *ps = as->ps;
 238         unsigned long flags;
 239
 240         spin_lock_irqsave(&ps->lock, flags);
 241         list_add_tail(&as->asynclist, &ps->async_pending);
 242         spin_unlock_irqrestore(&ps->lock, flags);
 243 }
 244
 245 static inline void async_removepending(struct async *as)
 246 {
 247         struct dev_state *ps = as->ps;
 248         unsigned long flags;
 249
 250         spin_lock_irqsave(&ps->lock, flags);
 251         list_del_init(&as->asynclist);
 252         spin_unlock_irqrestore(&ps->lock, flags);
 253 }
 254
 255 static inline struct async *async_getcompleted(struct dev_state *ps)
 256 {
 257         unsigned long flags;
 258         struct async *as = NULL;
 259
 260         spin_lock_irqsave(&ps->lock, flags);
 261         if (!list_empty(&ps->async_completed)) {
 262                 as = list_entry(ps->async_completed.next, struct async, asynclist);
 263                 list_del_init(&as->asynclist);
 264         }
 265         spin_unlock_irqrestore(&ps->lock, flags);
 266         return as;
 267 }
 268
 269 static inline struct async *async_getpending(struct dev_state *ps, void __user *userurb)
 270 {
 271         unsigned long flags;
 272         struct async *as;
 273
 274         spin_lock_irqsave(&ps->lock, flags);
 275         list_for_each_entry(as, &ps->async_pending, asynclist)
 276                 if (as->userurb == userurb) {
 277                         list_del_init(&as->asynclist);
 278                         spin_unlock_irqrestore(&ps->lock, flags);
 279                         return as;
 280                 }
 281         spin_unlock_irqrestore(&ps->lock, flags);
 282         return NULL;
 283 }
 284
 285 static void snoop_urb(struct urb *urb, void __user *userurb)
 286 {
 287         int j;
 288         unsigned char *data = urb->transfer_buffer;
 289
 290         if (!usbfs_snoop)
 291                 return;
 292
 293         if (urb->pipe & USB_DIR_IN)
 294                 dev_info(&urb->dev->dev, "direction=IN\n");
 295         else
 296                 dev_info(&urb->dev->dev, "direction=OUT\n");
 297         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
 298         dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
 299                  urb->transfer_buffer_length);
 300         dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
 301         dev_info(&urb->dev->dev, "data: ");
 302         for (j = 0; j < urb->transfer_buffer_length; ++j)
 303                 printk ("%02x ", data[j]);
 304         printk("\n");
 305 }
 306
 307 static void async_completed(struct urb *urb)
 308 {
 309         struct async *as = urb->context;
 310         struct dev_state *ps = as->ps;
 311         struct siginfo sinfo;
 312
 313         spin_lock(&ps->lock);
 314         list_move_tail(&as->asynclist, &ps->async_completed);
 315         spin_unlock(&ps->lock);
 316         if (as->signr) {
 317                 sinfo.si_signo = as->signr;
 318                 sinfo.si_errno = as->urb->status;
 319                 sinfo.si_code = SI_ASYNCIO;
 320                 sinfo.si_addr = as->userurb;
 321                 kill_pid_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
 322                                       as->euid, as->secid);
 323         }
 324         snoop(&urb->dev->dev, "urb complete\n");
 325         snoop_urb(urb, as->userurb);
 326         wake_up(&ps->wait);
 327 }
 328
 329 static void destroy_async (struct dev_state *ps, struct list_head *list)
 330 {
 331         struct async *as;
 332         unsigned long flags;
 333
 334         spin_lock_irqsave(&ps->lock, flags);
 335         while (!list_empty(list)) {
 336                 as = list_entry(list->next, struct async, asynclist);
 337                 list_del_init(&as->asynclist);
 338
 339                 /* drop the spinlock so the completion handler can run */
 340                 spin_unlock_irqrestore(&ps->lock, flags);
 341                 usb_kill_urb(as->urb);
 342                 spin_lock_irqsave(&ps->lock, flags);
 343         }
 344         spin_unlock_irqrestore(&ps->lock, flags);
 345         as = async_getcompleted(ps);
 346         while (as) {
 347                 free_async(as);
 348                 as = async_getcompleted(ps);
 349         }
 350 }
 351
 352 static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum)
 353 {
 354         struct list_head *p, *q, hitlist;
 355         unsigned long flags;
 356
 357         INIT_LIST_HEAD(&hitlist);
 358         spin_lock_irqsave(&ps->lock, flags);
 359         list_for_each_safe(p, q, &ps->async_pending)
 360                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 361                         list_move_tail(p, &hitlist);
 362         spin_unlock_irqrestore(&ps->lock, flags);
 363         destroy_async(ps, &hitlist);
 364 }
 365
 366 static inline void destroy_all_async(struct dev_state *ps)
 367 {
 368                 destroy_async(ps, &ps->async_pending);
 369 }
 370
 371 /*
 372  * interface claims are made only at the request of user level code,
 373  * which can also release them (explicitly or by closing files).
 374  * they're also undone when devices disconnect.
 375  */
 376
 377 static int driver_probe (struct usb_interface *intf,
 378                          const struct usb_device_id *id)
 379 {
 380         return -ENODEV;
 381 }
 382
 383 static void driver_disconnect(struct usb_interface *intf)
 384 {
 385         struct dev_state *ps = usb_get_intfdata (intf);
 386         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 387
 388         if (!ps)
 389                 return;
 390
 391         /* NOTE:  this relies on usbcore having canceled and completed
 392          * all pending I/O requests; 2.6 does that.
 393          */
 394
 395         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 396                 clear_bit(ifnum, &ps->ifclaimed);
 397         else
 398                 warn("interface number %u out of range", ifnum);
 399
 400         usb_set_intfdata (intf, NULL);
 401
 402         /* force async requests to complete */
 403         destroy_async_on_interface(ps, ifnum);
 404 }
 405
 406 struct usb_driver usbfs_driver = {
 407         .name =         "usbfs",
 408         .probe =        driver_probe,
 409         .disconnect =   driver_disconnect,
 410 };
 411
 412 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 413 {
 414         struct usb_device *dev = ps->dev;
 415         struct usb_interface *intf;
 416         int err;
 417
 418         if (ifnum >= 8*sizeof(ps->ifclaimed))
 419                 return -EINVAL;
 420         /* already claimed */
 421         if (test_bit(ifnum, &ps->ifclaimed))
 422                 return 0;
 423
 424         intf = usb_ifnum_to_if(dev, ifnum);
 425         if (!intf)
 426                 err = -ENOENT;
 427         else
 428                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 429         if (err == 0)
 430                 set_bit(ifnum, &ps->ifclaimed);
 431         return err;
 432 }
 433
 434 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 435 {
 436         struct usb_device *dev;
 437         struct usb_interface *intf;
 438         int err;
 439
 440         err = -EINVAL;
 441         if (ifnum >= 8*sizeof(ps->ifclaimed))
 442                 return err;
 443         dev = ps->dev;
 444         intf = usb_ifnum_to_if(dev, ifnum);
 445         if (!intf)
 446                 err = -ENOENT;
 447         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 448                 usb_driver_release_interface(&usbfs_driver, intf);
 449                 err = 0;
 450         }
 451         return err;
 452 }
 453
 454 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 455 {
 456         if (ps->dev->state != USB_STATE_CONFIGURED)
 457                 return -EHOSTUNREACH;
 458         if (ifnum >= 8*sizeof(ps->ifclaimed))
 459                 return -EINVAL;
 460         if (test_bit(ifnum, &ps->ifclaimed))
 461                 return 0;
 462         /* if not yet claimed, claim it for the driver */
 463         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n",
 464                current->pid, current->comm, ifnum);
 465         return claimintf(ps, ifnum);
 466 }
 467
 468 static int findintfep(struct usb_device *dev, unsigned int ep)
 469 {
 470         unsigned int i, j, e;
 471         struct usb_interface *intf;
 472         struct usb_host_interface *alts;
 473         struct usb_endpoint_descriptor *endpt;
 474
 475         if (ep & ~(USB_DIR_IN|0xf))
 476                 return -EINVAL;
 477         if (!dev->actconfig)
 478                 return -ESRCH;
 479         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 480                 intf = dev->actconfig->interface[i];
 481                 for (j = 0; j < intf->num_altsetting; j++) {
 482                         alts = &intf->altsetting[j];
 483                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 484                                 endpt = &alts->endpoint[e].desc;
 485                                 if (endpt->bEndpointAddress == ep)
 486                                         return alts->desc.bInterfaceNumber;
 487                         }
 488                 }
 489         }
 490         return -ENOENT;
 491 }
 492
 493 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
 494 {
 495         int ret = 0;
 496
 497         if (ps->dev->state != USB_STATE_ADDRESS
 498          && ps->dev->state != USB_STATE_CONFIGURED)
 499                 return -EHOSTUNREACH;
 500         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 501                 return 0;
 502
 503         index &= 0xff;
 504         switch (requesttype & USB_RECIP_MASK) {
 505         case USB_RECIP_ENDPOINT:
 506                 if ((ret = findintfep(ps->dev, index)) >= 0)
 507                         ret = checkintf(ps, ret);
 508                 break;
 509
 510         case USB_RECIP_INTERFACE:
 511                 ret = checkintf(ps, index);
 512                 break;
 513         }
 514         return ret;
 515 }
 516
 517 static struct usb_device *usbdev_lookup_minor(int minor)
 518 {
 519         struct device *device;
 520         struct usb_device *udev = NULL;
 521
 522         down(&usb_device_class->sem);
 523         list_for_each_entry(device, &usb_device_class->devices, node) {
 524                 if (device->devt == MKDEV(USB_DEVICE_MAJOR, minor)) {
 525                         udev = device->platform_data;
 526                         break;
 527                 }
 528         }
 529         up(&usb_device_class->sem);
 530
 531         return udev;
 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         /* check if we are called from a real node or usbfs */
 552         if (imajor(inode) == USB_DEVICE_MAJOR)
 553                 dev = usbdev_lookup_minor(iminor(inode));
 554         if (!dev)
 555                 dev = inode->i_private;
 556         if (!dev)
 557                 goto out;
 558         ret = usb_autoresume_device(dev);
 559         if (ret)
 560                 goto out;
 561
 562         usb_get_dev(dev);
 563         ret = 0;
 564         ps->dev = dev;
 565         ps->file = file;
 566         spin_lock_init(&ps->lock);
 567         INIT_LIST_HEAD(&ps->list);
 568         INIT_LIST_HEAD(&ps->async_pending);
 569         INIT_LIST_HEAD(&ps->async_completed);
 570         init_waitqueue_head(&ps->wait);
 571         ps->discsignr = 0;
 572         ps->disc_pid = get_pid(task_pid(current));
 573         ps->disc_uid = current->uid;
 574         ps->disc_euid = current->euid;
 575         ps->disccontext = NULL;
 576         ps->ifclaimed = 0;
 577         security_task_getsecid(current, &ps->secid);
 578         wmb();
 579         list_add_tail(&ps->list, &dev->filelist);
 580         file->private_data = ps;
 581  out:
 582         if (ret)
 583                 kfree(ps);
 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 = 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_autosuspend_device(dev);
 608         usb_unlock_device(dev);
 609         usb_put_dev(dev);
 610         put_pid(ps->disc_pid);
 611         kfree(ps);
 612         return 0;
 613 }
 614
 615 static int proc_control(struct dev_state *ps, void __user *arg)
 616 {
 617         struct usb_device *dev = ps->dev;
 618         struct usbdevfs_ctrltransfer ctrl;
 619         unsigned int tmo;
 620         unsigned char *tbuf;
 621         int i, j, ret;
 622
 623         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 624                 return -EFAULT;
 625         if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
 626                 return ret;
 627         if (ctrl.wLength > PAGE_SIZE)
 628                 return -EINVAL;
 629         if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
 630                 return -ENOMEM;
 631         tmo = ctrl.timeout;
 632         if (ctrl.bRequestType & 0x80) {
 633                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
 634                         free_page((unsigned long)tbuf);
 635                         return -EINVAL;
 636                 }
 637                 snoop(&dev->dev, "control read: bRequest=%02x "
 638                                 "bRrequestType=%02x wValue=%04x "
 639                                 "wIndex=%04x wLength=%04x\n",
 640                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 641                                 ctrl.wIndex, ctrl.wLength);
 642
 643                 usb_unlock_device(dev);
 644                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 645                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 646                 usb_lock_device(dev);
 647                 if ((i > 0) && ctrl.wLength) {
 648                         if (usbfs_snoop) {
 649                                 dev_info(&dev->dev, "control read: data ");
 650                                 for (j = 0; j < i; ++j)
 651                                         printk("%02x ", (unsigned char)(tbuf)[j]);
 652                                 printk("\n");
 653                         }
 654                         if (copy_to_user(ctrl.data, tbuf, i)) {
 655                                 free_page((unsigned long)tbuf);
 656                                 return -EFAULT;
 657                         }
 658                 }
 659         } else {
 660                 if (ctrl.wLength) {
 661                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 662                                 free_page((unsigned long)tbuf);
 663                                 return -EFAULT;
 664                         }
 665                 }
 666                 snoop(&dev->dev, "control write: bRequest=%02x "
 667                                 "bRrequestType=%02x wValue=%04x "
 668                                 "wIndex=%04x wLength=%04x\n",
 669                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 670                                 ctrl.wIndex, ctrl.wLength);
 671                 if (usbfs_snoop) {
 672                         dev_info(&dev->dev, "control write: data: ");
 673                         for (j = 0; j < ctrl.wLength; ++j)
 674                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 675                         printk("\n");
 676                 }
 677                 usb_unlock_device(dev);
 678                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 679                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 680                 usb_lock_device(dev);
 681         }
 682         free_page((unsigned long)tbuf);
 683         if (i<0 && i != -EPIPE) {
 684                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 685                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 686                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 687                            ctrl.wLength, i);
 688         }
 689         return i;
 690 }
 691
 692 static int proc_bulk(struct dev_state *ps, void __user *arg)
 693 {
 694         struct usb_device *dev = ps->dev;
 695         struct usbdevfs_bulktransfer bulk;
 696         unsigned int tmo, len1, pipe;
 697         int len2;
 698         unsigned char *tbuf;
 699         int i, j, ret;
 700
 701         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 702                 return -EFAULT;
 703         if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
 704                 return ret;
 705         if ((ret = checkintf(ps, ret)))
 706                 return ret;
 707         if (bulk.ep & USB_DIR_IN)
 708                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 709         else
 710                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 711         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 712                 return -EINVAL;
 713         len1 = bulk.len;
 714         if (len1 > MAX_USBFS_BUFFER_SIZE)
 715                 return -EINVAL;
 716         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 717                 return -ENOMEM;
 718         tmo = bulk.timeout;
 719         if (bulk.ep & 0x80) {
 720                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 721                         kfree(tbuf);
 722                         return -EINVAL;
 723                 }
 724                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
 725                         bulk.len, bulk.timeout);
 726                 usb_unlock_device(dev);
 727                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 728                 usb_lock_device(dev);
 729                 if (!i && len2) {
 730                         if (usbfs_snoop) {
 731                                 dev_info(&dev->dev, "bulk read: data ");
 732                                 for (j = 0; j < len2; ++j)
 733                                         printk("%02x ", (unsigned char)(tbuf)[j]);
 734                                 printk("\n");
 735                         }
 736                         if (copy_to_user(bulk.data, tbuf, len2)) {
 737                                 kfree(tbuf);
 738                                 return -EFAULT;
 739                         }
 740                 }
 741         } else {
 742                 if (len1) {
 743                         if (copy_from_user(tbuf, bulk.data, len1)) {
 744                                 kfree(tbuf);
 745                                 return -EFAULT;
 746                         }
 747                 }
 748                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
 749                         bulk.len, bulk.timeout);
 750                 if (usbfs_snoop) {
 751                         dev_info(&dev->dev, "bulk write: data: ");
 752                         for (j = 0; j < len1; ++j)
 753                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 754                         printk("\n");
 755                 }
 756                 usb_unlock_device(dev);
 757                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 758                 usb_lock_device(dev);
 759         }
 760         kfree(tbuf);
 761         if (i < 0)
 762                 return i;
 763         return len2;
 764 }
 765
 766 static int proc_resetep(struct dev_state *ps, void __user *arg)
 767 {
 768         unsigned int ep;
 769         int ret;
 770
 771         if (get_user(ep, (unsigned int __user *)arg))
 772                 return -EFAULT;
 773         if ((ret = findintfep(ps->dev, ep)) < 0)
 774                 return ret;
 775         if ((ret = checkintf(ps, ret)))
 776                 return ret;
 777         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
 778         return 0;
 779 }
 780
 781 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 782 {
 783         unsigned int ep;
 784         int pipe;
 785         int ret;
 786
 787         if (get_user(ep, (unsigned int __user *)arg))
 788                 return -EFAULT;
 789         if ((ret = findintfep(ps->dev, ep)) < 0)
 790                 return ret;
 791         if ((ret = checkintf(ps, ret)))
 792                 return ret;
 793         if (ep & USB_DIR_IN)
 794                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 795         else
 796                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 797
 798         return usb_clear_halt(ps->dev, pipe);
 799 }
 800
 801
 802 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 803 {
 804         struct usbdevfs_getdriver gd;
 805         struct usb_interface *intf;
 806         int ret;
 807
 808         if (copy_from_user(&gd, arg, sizeof(gd)))
 809                 return -EFAULT;
 810         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 811         if (!intf || !intf->dev.driver)
 812                 ret = -ENODATA;
 813         else {
 814                 strncpy(gd.driver, intf->dev.driver->name,
 815                                 sizeof(gd.driver));
 816                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 817         }
 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         int u;
 853         int status = 0;
 854         struct usb_host_config *actconfig;
 855
 856         if (get_user(u, (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, 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: bRequest=%02x "
 959                         "bRrequestType=%02x wValue=%04x "
 960                         "wIndex=%04x wLength=%04x\n",
 961                         dr->bRequest, dr->bRequestType, dr->wValue,
 962                         dr->wIndex, dr->wLength);
 963                 break;
 964
 965         case USBDEVFS_URB_TYPE_BULK:
 966                 switch (ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 967                 case USB_ENDPOINT_XFER_CONTROL:
 968                 case USB_ENDPOINT_XFER_ISOC:
 969                         return -EINVAL;
 970                 /* allow single-shot interrupt transfers, at bogus rates */
 971                 }
 972                 uurb->number_of_packets = 0;
 973                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
 974                         return -EINVAL;
 975                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
 976                         return -EFAULT;
 977                 snoop(&ps->dev->dev, "bulk urb\n");
 978                 break;
 979
 980         case USBDEVFS_URB_TYPE_ISO:
 981                 /* arbitrary limit */
 982                 if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
 983                         return -EINVAL;
 984                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 985                                 != USB_ENDPOINT_XFER_ISOC)
 986                         return -EINVAL;
 987                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
 988                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
 989                         return -ENOMEM;
 990                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
 991                         kfree(isopkt);
 992                         return -EFAULT;
 993                 }
 994                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
 995                         /* arbitrary limit, sufficient for USB 2.0 high-bandwidth iso */
 996                         if (isopkt[u].length > 8192) {
 997                                 kfree(isopkt);
 998                                 return -EINVAL;
 999                         }
1000                         totlen += isopkt[u].length;
1001                 }
1002                 if (totlen > 32768) {
1003                         kfree(isopkt);
1004                         return -EINVAL;
1005                 }
1006                 uurb->buffer_length = totlen;
1007                 snoop(&ps->dev->dev, "iso urb\n");
1008                 break;
1009
1010         case USBDEVFS_URB_TYPE_INTERRUPT:
1011                 uurb->number_of_packets = 0;
1012                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
1013                                 != USB_ENDPOINT_XFER_INT)
1014                         return -EINVAL;
1015                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1016                         return -EINVAL;
1017                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
1018                         return -EFAULT;
1019                 snoop(&ps->dev->dev, "interrupt urb\n");
1020                 break;
1021
1022         default:
1023                 return -EINVAL;
1024         }
1025         if (!(as = alloc_async(uurb->number_of_packets))) {
1026                 kfree(isopkt);
1027                 kfree(dr);
1028                 return -ENOMEM;
1029         }
1030         if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
1031                 kfree(isopkt);
1032                 kfree(dr);
1033                 free_async(as);
1034                 return -ENOMEM;
1035         }
1036         as->urb->dev = ps->dev;
1037         as->urb->pipe = (uurb->type << 30) | __create_pipe(ps->dev, uurb->endpoint & 0xf) | (uurb->endpoint & USB_DIR_IN);
1038         as->urb->transfer_flags = uurb->flags;
1039         as->urb->transfer_buffer_length = uurb->buffer_length;
1040         as->urb->setup_packet = (unsigned char*)dr;
1041         as->urb->start_frame = uurb->start_frame;
1042         as->urb->number_of_packets = uurb->number_of_packets;
1043         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1044                         ps->dev->speed == USB_SPEED_HIGH)
1045                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1046         else
1047                 as->urb->interval = ep->desc.bInterval;
1048         as->urb->context = as;
1049         as->urb->complete = async_completed;
1050         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1051                 as->urb->iso_frame_desc[u].offset = totlen;
1052                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1053                 totlen += isopkt[u].length;
1054         }
1055         kfree(isopkt);
1056         as->ps = ps;
1057         as->userurb = arg;
1058         if (uurb->endpoint & USB_DIR_IN)
1059                 as->userbuffer = uurb->buffer;
1060         else
1061                 as->userbuffer = NULL;
1062         as->signr = uurb->signr;
1063         as->ifnum = ifnum;
1064         as->pid = get_pid(task_pid(current));
1065         as->uid = current->uid;
1066         as->euid = current->euid;
1067         security_task_getsecid(current, &as->secid);
1068         if (!(uurb->endpoint & USB_DIR_IN)) {
1069                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, as->urb->transfer_buffer_length)) {
1070                         free_async(as);
1071                         return -EFAULT;
1072                 }
1073         }
1074         snoop(&as->urb->dev->dev, "submit urb\n");
1075         snoop_urb(as->urb, as->userurb);
1076         async_newpending(as);
1077         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1078                 dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
1079                 async_removepending(as);
1080                 free_async(as);
1081                 return ret;
1082         }
1083         return 0;
1084 }
1085
1086 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1087 {
1088         struct usbdevfs_urb uurb;
1089
1090         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1091                 return -EFAULT;
1092
1093         return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg);
1094 }
1095
1096 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1097 {
1098         struct async *as;
1099
1100         as = async_getpending(ps, arg);
1101         if (!as)
1102                 return -EINVAL;
1103         usb_kill_urb(as->urb);
1104         return 0;
1105 }
1106
1107 static int processcompl(struct async *as, void __user * __user *arg)
1108 {
1109         struct urb *urb = as->urb;
1110         struct usbdevfs_urb __user *userurb = as->userurb;
1111         void __user *addr = as->userurb;
1112         unsigned int i;
1113
1114         if (as->userbuffer)
1115                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1116                         return -EFAULT;
1117         if (put_user(urb->status, &userurb->status))
1118                 return -EFAULT;
1119         if (put_user(urb->actual_length, &userurb->actual_length))
1120                 return -EFAULT;
1121         if (put_user(urb->error_count, &userurb->error_count))
1122                 return -EFAULT;
1123
1124         if (usb_pipeisoc(urb->pipe)) {
1125                 for (i = 0; i < urb->number_of_packets; i++) {
1126                         if (put_user(urb->iso_frame_desc[i].actual_length,
1127                                      &userurb->iso_frame_desc[i].actual_length))
1128                                 return -EFAULT;
1129                         if (put_user(urb->iso_frame_desc[i].status,
1130                                      &userurb->iso_frame_desc[i].status))
1131                                 return -EFAULT;
1132                 }
1133         }
1134
1135         free_async(as);
1136
1137         if (put_user(addr, (void __user * __user *)arg))
1138                 return -EFAULT;
1139         return 0;
1140 }
1141
1142 static struct async* reap_as(struct dev_state *ps)
1143 {
1144         DECLARE_WAITQUEUE(wait, current);
1145         struct async *as = NULL;
1146         struct usb_device *dev = ps->dev;
1147
1148         add_wait_queue(&ps->wait, &wait);
1149         for (;;) {
1150                 __set_current_state(TASK_INTERRUPTIBLE);
1151                 if ((as = async_getcompleted(ps)))
1152                         break;
1153                 if (signal_pending(current))
1154                         break;
1155                 usb_unlock_device(dev);
1156                 schedule();
1157                 usb_lock_device(dev);
1158         }
1159         remove_wait_queue(&ps->wait, &wait);
1160         set_current_state(TASK_RUNNING);
1161         return as;
1162 }
1163
1164 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1165 {
1166         struct async *as = reap_as(ps);
1167         if (as)
1168                 return processcompl(as, (void __user * __user *)arg);
1169         if (signal_pending(current))
1170                 return -EINTR;
1171         return -EIO;
1172 }
1173
1174 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1175 {
1176         struct async *as;
1177
1178         if (!(as = async_getcompleted(ps)))
1179                 return -EAGAIN;
1180         return processcompl(as, (void __user * __user *)arg);
1181 }
1182
1183 #ifdef CONFIG_COMPAT
1184
1185 static int get_urb32(struct usbdevfs_urb *kurb,
1186                      struct usbdevfs_urb32 __user *uurb)
1187 {
1188         __u32  uptr;
1189         if (get_user(kurb->type, &uurb->type) ||
1190             __get_user(kurb->endpoint, &uurb->endpoint) ||
1191             __get_user(kurb->status, &uurb->status) ||
1192             __get_user(kurb->flags, &uurb->flags) ||
1193             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1194             __get_user(kurb->actual_length, &uurb->actual_length) ||
1195             __get_user(kurb->start_frame, &uurb->start_frame) ||
1196             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1197             __get_user(kurb->error_count, &uurb->error_count) ||
1198             __get_user(kurb->signr, &uurb->signr))
1199                 return -EFAULT;
1200
1201         if (__get_user(uptr, &uurb->buffer))
1202                 return -EFAULT;
1203         kurb->buffer = compat_ptr(uptr);
1204         if (__get_user(uptr, &uurb->buffer))
1205                 return -EFAULT;
1206         kurb->usercontext = compat_ptr(uptr);
1207
1208         return 0;
1209 }
1210
1211 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1212 {
1213         struct usbdevfs_urb uurb;
1214
1215         if (get_urb32(&uurb,(struct usbdevfs_urb32 __user *)arg))
1216                 return -EFAULT;
1217
1218         return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg);
1219 }
1220
1221 static int processcompl_compat(struct async *as, void __user * __user *arg)
1222 {
1223         struct urb *urb = as->urb;
1224         struct usbdevfs_urb32 __user *userurb = as->userurb;
1225         void __user *addr = as->userurb;
1226         unsigned int i;
1227
1228         if (as->userbuffer)
1229                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1230                         return -EFAULT;
1231         if (put_user(urb->status, &userurb->status))
1232                 return -EFAULT;
1233         if (put_user(urb->actual_length, &userurb->actual_length))
1234                 return -EFAULT;
1235         if (put_user(urb->error_count, &userurb->error_count))
1236                 return -EFAULT;
1237
1238         if (usb_pipeisoc(urb->pipe)) {
1239                 for (i = 0; i < urb->number_of_packets; i++) {
1240                         if (put_user(urb->iso_frame_desc[i].actual_length,
1241                                      &userurb->iso_frame_desc[i].actual_length))
1242                                 return -EFAULT;
1243                         if (put_user(urb->iso_frame_desc[i].status,
1244                                      &userurb->iso_frame_desc[i].status))
1245                                 return -EFAULT;
1246                 }
1247         }
1248
1249         free_async(as);
1250         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1251                 return -EFAULT;
1252         return 0;
1253 }
1254
1255 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1256 {
1257         struct async *as = reap_as(ps);
1258         if (as)
1259                 return processcompl_compat(as, (void __user * __user *)arg);
1260         if (signal_pending(current))
1261                 return -EINTR;
1262         return -EIO;
1263 }
1264
1265 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1266 {
1267         struct async *as;
1268
1269         if (!(as = async_getcompleted(ps)))
1270                 return -EAGAIN;
1271         return processcompl_compat(as, (void __user * __user *)arg);
1272 }
1273
1274 #endif
1275
1276 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1277 {
1278         struct usbdevfs_disconnectsignal ds;
1279
1280         if (copy_from_user(&ds, arg, sizeof(ds)))
1281                 return -EFAULT;
1282         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1283                 return -EINVAL;
1284         ps->discsignr = ds.signr;
1285         ps->disccontext = ds.context;
1286         return 0;
1287 }
1288
1289 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1290 {
1291         unsigned int ifnum;
1292
1293         if (get_user(ifnum, (unsigned int __user *)arg))
1294                 return -EFAULT;
1295         return claimintf(ps, ifnum);
1296 }
1297
1298 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1299 {
1300         unsigned int ifnum;
1301         int ret;
1302
1303         if (get_user(ifnum, (unsigned int __user *)arg))
1304                 return -EFAULT;
1305         if ((ret = releaseintf(ps, ifnum)) < 0)
1306                 return ret;
1307         destroy_async_on_interface (ps, ifnum);
1308         return 0;
1309 }
1310
1311 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1312 {
1313         int                     size;
1314         void                    *buf = NULL;
1315         int                     retval = 0;
1316         struct usb_interface    *intf = NULL;
1317         struct usb_driver       *driver = NULL;
1318
1319         /* alloc buffer */
1320         if ((size = _IOC_SIZE (ctl->ioctl_code)) > 0) {
1321                 if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
1322                         return -ENOMEM;
1323                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1324                         if (copy_from_user (buf, ctl->data, size)) {
1325                                 kfree(buf);
1326                                 return -EFAULT;
1327                         }
1328                 } else {
1329                         memset (buf, 0, size);
1330                 }
1331         }
1332
1333         if (!connected(ps)) {
1334                 kfree(buf);
1335                 return -ENODEV;
1336         }
1337
1338         if (ps->dev->state != USB_STATE_CONFIGURED)
1339                 retval = -EHOSTUNREACH;
1340         else if (!(intf = usb_ifnum_to_if (ps->dev, ctl->ifno)))
1341                retval = -EINVAL;
1342         else switch (ctl->ioctl_code) {
1343
1344         /* disconnect kernel driver from interface */
1345         case USBDEVFS_DISCONNECT:
1346                 if (intf->dev.driver) {
1347                         driver = to_usb_driver(intf->dev.driver);
1348                         dev_dbg (&intf->dev, "disconnect by usbfs\n");
1349                         usb_driver_release_interface(driver, intf);
1350                 } else
1351                         retval = -ENODATA;
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                 retval = 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                 if (intf->dev.driver)
1364                         driver = to_usb_driver(intf->dev.driver);
1365                 if (driver == NULL || driver->ioctl == NULL) {
1366                         retval = -ENOTTY;
1367                 } else {
1368                         retval = driver->ioctl (intf, ctl->ioctl_code, buf);
1369                         if (retval == -ENOIOCTLCMD)
1370                                 retval = -ENOTTY;
1371                 }
1372         }
1373
1374         /* cleanup and return */
1375         if (retval >= 0
1376                         && (_IOC_DIR (ctl->ioctl_code) & _IOC_READ) != 0
1377                         && size > 0
1378                         && copy_to_user (ctl->data, buf, size) != 0)
1379                 retval = -EFAULT;
1380
1381         kfree(buf);
1382         return retval;
1383 }
1384
1385 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1386 {
1387         struct usbdevfs_ioctl   ctrl;
1388
1389         if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
1390                 return -EFAULT;
1391         return proc_ioctl(ps, &ctrl);
1392 }
1393
1394 #ifdef CONFIG_COMPAT
1395 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1396 {
1397         struct usbdevfs_ioctl32 __user *uioc;
1398         struct usbdevfs_ioctl ctrl;
1399         u32 udata;
1400
1401         uioc = compat_ptr((long)arg);
1402         if (get_user(ctrl.ifno, &uioc->ifno) ||
1403             get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1404             __get_user(udata, &uioc->data))
1405                 return -EFAULT;
1406         ctrl.data = compat_ptr(udata);
1407
1408         return proc_ioctl(ps, &ctrl);
1409 }
1410 #endif
1411
1412 /*
1413  * NOTE:  All requests here that have interface numbers as parameters
1414  * are assuming that somehow the configuration has been prevented from
1415  * changing.  But there's no mechanism to ensure that...
1416  */
1417 static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1418 {
1419         struct dev_state *ps = file->private_data;
1420         struct usb_device *dev = ps->dev;
1421         void __user *p = (void __user *)arg;
1422         int ret = -ENOTTY;
1423
1424         if (!(file->f_mode & FMODE_WRITE))
1425                 return -EPERM;
1426         usb_lock_device(dev);
1427         if (!connected(ps)) {
1428                 usb_unlock_device(dev);
1429                 return -ENODEV;
1430         }
1431
1432         switch (cmd) {
1433         case USBDEVFS_CONTROL:
1434                 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
1435                 ret = proc_control(ps, p);
1436                 if (ret >= 0)
1437                         inode->i_mtime = CURRENT_TIME;
1438                 break;
1439
1440         case USBDEVFS_BULK:
1441                 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
1442                 ret = proc_bulk(ps, p);
1443                 if (ret >= 0)
1444                         inode->i_mtime = CURRENT_TIME;
1445                 break;
1446
1447         case USBDEVFS_RESETEP:
1448                 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
1449                 ret = proc_resetep(ps, p);
1450                 if (ret >= 0)
1451                         inode->i_mtime = CURRENT_TIME;
1452                 break;
1453
1454         case USBDEVFS_RESET:
1455                 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
1456                 ret = proc_resetdevice(ps);
1457                 break;
1458
1459         case USBDEVFS_CLEAR_HALT:
1460                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
1461                 ret = proc_clearhalt(ps, p);
1462                 if (ret >= 0)
1463                         inode->i_mtime = CURRENT_TIME;
1464                 break;
1465
1466         case USBDEVFS_GETDRIVER:
1467                 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
1468                 ret = proc_getdriver(ps, p);
1469                 break;
1470
1471         case USBDEVFS_CONNECTINFO:
1472                 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
1473                 ret = proc_connectinfo(ps, p);
1474                 break;
1475
1476         case USBDEVFS_SETINTERFACE:
1477                 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
1478                 ret = proc_setintf(ps, p);
1479                 break;
1480
1481         case USBDEVFS_SETCONFIGURATION:
1482                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
1483                 ret = proc_setconfig(ps, p);
1484                 break;
1485
1486         case USBDEVFS_SUBMITURB:
1487                 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
1488                 ret = proc_submiturb(ps, p);
1489                 if (ret >= 0)
1490                         inode->i_mtime = CURRENT_TIME;
1491                 break;
1492
1493 #ifdef CONFIG_COMPAT
1494
1495         case USBDEVFS_SUBMITURB32:
1496                 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
1497                 ret = proc_submiturb_compat(ps, p);
1498                 if (ret >= 0)
1499                         inode->i_mtime = CURRENT_TIME;
1500                 break;
1501
1502         case USBDEVFS_REAPURB32:
1503                 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
1504                 ret = proc_reapurb_compat(ps, p);
1505                 break;
1506
1507         case USBDEVFS_REAPURBNDELAY32:
1508                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
1509                 ret = proc_reapurbnonblock_compat(ps, p);
1510                 break;
1511
1512         case USBDEVFS_IOCTL32:
1513                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1514                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1515                 break;
1516 #endif
1517
1518         case USBDEVFS_DISCARDURB:
1519                 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
1520                 ret = proc_unlinkurb(ps, p);
1521                 break;
1522
1523         case USBDEVFS_REAPURB:
1524                 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
1525                 ret = proc_reapurb(ps, p);
1526                 break;
1527
1528         case USBDEVFS_REAPURBNDELAY:
1529                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
1530                 ret = proc_reapurbnonblock(ps, p);
1531                 break;
1532
1533         case USBDEVFS_DISCSIGNAL:
1534                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
1535                 ret = proc_disconnectsignal(ps, p);
1536                 break;
1537
1538         case USBDEVFS_CLAIMINTERFACE:
1539                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
1540                 ret = proc_claiminterface(ps, p);
1541                 break;
1542
1543         case USBDEVFS_RELEASEINTERFACE:
1544                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
1545                 ret = proc_releaseinterface(ps, p);
1546                 break;
1547
1548         case USBDEVFS_IOCTL:
1549                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1550                 ret = proc_ioctl_default(ps, p);
1551                 break;
1552         }
1553         usb_unlock_device(dev);
1554         if (ret >= 0)
1555                 inode->i_atime = CURRENT_TIME;
1556         return ret;
1557 }
1558
1559 /* No kernel lock - fine */
1560 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
1561 {
1562         struct dev_state *ps = file->private_data;
1563         unsigned int mask = 0;
1564
1565         poll_wait(file, &ps->wait, wait);
1566         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1567                 mask |= POLLOUT | POLLWRNORM;
1568         if (!connected(ps))
1569                 mask |= POLLERR | POLLHUP;
1570         return mask;
1571 }
1572
1573 const struct file_operations usbfs_device_file_operations = {
1574         .llseek =       usbdev_lseek,
1575         .read =         usbdev_read,
1576         .poll =         usbdev_poll,
1577         .ioctl =        usbdev_ioctl,
1578         .open =         usbdev_open,
1579         .release =      usbdev_release,
1580 };
1581
1582 static int usbdev_add(struct usb_device *dev)
1583 {
1584         int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1585
1586         dev->usbfs_dev = device_create(usb_device_class, &dev->dev,
1587                                 MKDEV(USB_DEVICE_MAJOR, minor),
1588                                 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1589         if (IS_ERR(dev->usbfs_dev))
1590                 return PTR_ERR(dev->usbfs_dev);
1591
1592         dev->usbfs_dev->platform_data = dev;
1593         return 0;
1594 }
1595
1596 static void usbdev_remove(struct usb_device *dev)
1597 {
1598         device_unregister(dev->usbfs_dev);
1599 }
1600
1601 static int usbdev_notify(struct notifier_block *self, unsigned long action,
1602                          void *dev)
1603 {
1604         switch (action) {
1605         case USB_DEVICE_ADD:
1606                 if (usbdev_add(dev))
1607                         return NOTIFY_BAD;
1608                 break;
1609         case USB_DEVICE_REMOVE:
1610                 usbdev_remove(dev);
1611                 break;
1612         }
1613         return NOTIFY_OK;
1614 }
1615
1616 static struct notifier_block usbdev_nb = {
1617         .notifier_call =        usbdev_notify,
1618 };
1619
1620 static struct cdev usb_device_cdev = {
1621         .kobj   = {.name = "usb_device", },
1622         .owner  = THIS_MODULE,
1623 };
1624
1625 int __init usbdev_init(void)
1626 {
1627         int retval;
1628
1629         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1630                         "usb_device");
1631         if (retval) {
1632                 err("unable to register minors for usb_device");
1633                 goto out;
1634         }
1635         cdev_init(&usb_device_cdev, &usbfs_device_file_operations);
1636         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1637         if (retval) {
1638                 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1639                 goto error_cdev;
1640         }
1641         usb_device_class = class_create(THIS_MODULE, "usb_device");
1642         if (IS_ERR(usb_device_class)) {
1643                 err("unable to register usb_device class");
1644                 retval = PTR_ERR(usb_device_class);
1645                 goto error_class;
1646         }
1647
1648         usb_register_notify(&usbdev_nb);
1649
1650 out:
1651         return retval;
1652
1653 error_class:
1654         usb_device_class = NULL;
1655         cdev_del(&usb_device_cdev);
1656
1657 error_cdev:
1658         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1659         goto out;
1660 }
1661
1662 void usbdev_cleanup(void)
1663 {
1664         usb_unregister_notify(&usbdev_nb);
1665         class_destroy(usb_device_class);
1666         cdev_del(&usb_device_cdev);
1667         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1668 }
1669