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         int status;
  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         dev_info(&urb->dev->dev, "direction=%s\n",
 294                         usb_urb_dir_in(urb) ? "IN" : "OUT");
 295         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
 296         dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
 297                  urb->transfer_buffer_length);
 298         dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
 299         dev_info(&urb->dev->dev, "data: ");
 300         for (j = 0; j < urb->transfer_buffer_length; ++j)
 301                 printk ("%02x ", data[j]);
 302         printk("\n");
 303 }
 304
 305 static void async_completed(struct urb *urb)
 306 {
 307         struct async *as = urb->context;
 308         struct dev_state *ps = as->ps;
 309         struct siginfo sinfo;
 310
 311         spin_lock(&ps->lock);
 312         list_move_tail(&as->asynclist, &ps->async_completed);
 313         spin_unlock(&ps->lock);
 314         as->status = urb->status;
 315         if (as->signr) {
 316                 sinfo.si_signo = as->signr;
 317                 sinfo.si_errno = as->status;
 318                 sinfo.si_code = SI_ASYNCIO;
 319                 sinfo.si_addr = as->userurb;
 320                 kill_pid_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
 321                                       as->euid, as->secid);
 322         }
 323         snoop(&urb->dev->dev, "urb complete\n");
 324         snoop_urb(urb, as->userurb);
 325         wake_up(&ps->wait);
 326 }
 327
 328 static void destroy_async (struct dev_state *ps, struct list_head *list)
 329 {
 330         struct async *as;
 331         unsigned long flags;
 332
 333         spin_lock_irqsave(&ps->lock, flags);
 334         while (!list_empty(list)) {
 335                 as = list_entry(list->next, struct async, asynclist);
 336                 list_del_init(&as->asynclist);
 337
 338                 /* drop the spinlock so the completion handler can run */
 339                 spin_unlock_irqrestore(&ps->lock, flags);
 340                 usb_kill_urb(as->urb);
 341                 spin_lock_irqsave(&ps->lock, flags);
 342         }
 343         spin_unlock_irqrestore(&ps->lock, flags);
 344         as = async_getcompleted(ps);
 345         while (as) {
 346                 free_async(as);
 347                 as = async_getcompleted(ps);
 348         }
 349 }
 350
 351 static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum)
 352 {
 353         struct list_head *p, *q, hitlist;
 354         unsigned long flags;
 355
 356         INIT_LIST_HEAD(&hitlist);
 357         spin_lock_irqsave(&ps->lock, flags);
 358         list_for_each_safe(p, q, &ps->async_pending)
 359                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 360                         list_move_tail(p, &hitlist);
 361         spin_unlock_irqrestore(&ps->lock, flags);
 362         destroy_async(ps, &hitlist);
 363 }
 364
 365 static inline void destroy_all_async(struct dev_state *ps)
 366 {
 367                 destroy_async(ps, &ps->async_pending);
 368 }
 369
 370 /*
 371  * interface claims are made only at the request of user level code,
 372  * which can also release them (explicitly or by closing files).
 373  * they're also undone when devices disconnect.
 374  */
 375
 376 static int driver_probe (struct usb_interface *intf,
 377                          const struct usb_device_id *id)
 378 {
 379         return -ENODEV;
 380 }
 381
 382 static void driver_disconnect(struct usb_interface *intf)
 383 {
 384         struct dev_state *ps = usb_get_intfdata (intf);
 385         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 386
 387         if (!ps)
 388                 return;
 389
 390         /* NOTE:  this relies on usbcore having canceled and completed
 391          * all pending I/O requests; 2.6 does that.
 392          */
 393
 394         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 395                 clear_bit(ifnum, &ps->ifclaimed);
 396         else
 397                 warn("interface number %u out of range", ifnum);
 398
 399         usb_set_intfdata (intf, NULL);
 400
 401         /* force async requests to complete */
 402         destroy_async_on_interface(ps, ifnum);
 403 }
 404
 405 struct usb_driver usbfs_driver = {
 406         .name =         "usbfs",
 407         .probe =        driver_probe,
 408         .disconnect =   driver_disconnect,
 409 };
 410
 411 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 412 {
 413         struct usb_device *dev = ps->dev;
 414         struct usb_interface *intf;
 415         int err;
 416
 417         if (ifnum >= 8*sizeof(ps->ifclaimed))
 418                 return -EINVAL;
 419         /* already claimed */
 420         if (test_bit(ifnum, &ps->ifclaimed))
 421                 return 0;
 422
 423         intf = usb_ifnum_to_if(dev, ifnum);
 424         if (!intf)
 425                 err = -ENOENT;
 426         else
 427                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 428         if (err == 0)
 429                 set_bit(ifnum, &ps->ifclaimed);
 430         return err;
 431 }
 432
 433 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 434 {
 435         struct usb_device *dev;
 436         struct usb_interface *intf;
 437         int err;
 438
 439         err = -EINVAL;
 440         if (ifnum >= 8*sizeof(ps->ifclaimed))
 441                 return err;
 442         dev = ps->dev;
 443         intf = usb_ifnum_to_if(dev, ifnum);
 444         if (!intf)
 445                 err = -ENOENT;
 446         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 447                 usb_driver_release_interface(&usbfs_driver, intf);
 448                 err = 0;
 449         }
 450         return err;
 451 }
 452
 453 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 454 {
 455         if (ps->dev->state != USB_STATE_CONFIGURED)
 456                 return -EHOSTUNREACH;
 457         if (ifnum >= 8*sizeof(ps->ifclaimed))
 458                 return -EINVAL;
 459         if (test_bit(ifnum, &ps->ifclaimed))
 460                 return 0;
 461         /* if not yet claimed, claim it for the driver */
 462         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n",
 463                current->pid, current->comm, ifnum);
 464         return claimintf(ps, ifnum);
 465 }
 466
 467 static int findintfep(struct usb_device *dev, unsigned int ep)
 468 {
 469         unsigned int i, j, e;
 470         struct usb_interface *intf;
 471         struct usb_host_interface *alts;
 472         struct usb_endpoint_descriptor *endpt;
 473
 474         if (ep & ~(USB_DIR_IN|0xf))
 475                 return -EINVAL;
 476         if (!dev->actconfig)
 477                 return -ESRCH;
 478         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 479                 intf = dev->actconfig->interface[i];
 480                 for (j = 0; j < intf->num_altsetting; j++) {
 481                         alts = &intf->altsetting[j];
 482                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 483                                 endpt = &alts->endpoint[e].desc;
 484                                 if (endpt->bEndpointAddress == ep)
 485                                         return alts->desc.bInterfaceNumber;
 486                         }
 487                 }
 488         }
 489         return -ENOENT;
 490 }
 491
 492 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
 493 {
 494         int ret = 0;
 495
 496         if (ps->dev->state != USB_STATE_ADDRESS
 497          && ps->dev->state != USB_STATE_CONFIGURED)
 498                 return -EHOSTUNREACH;
 499         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 500                 return 0;
 501
 502         index &= 0xff;
 503         switch (requesttype & USB_RECIP_MASK) {
 504         case USB_RECIP_ENDPOINT:
 505                 if ((ret = findintfep(ps->dev, index)) >= 0)
 506                         ret = checkintf(ps, ret);
 507                 break;
 508
 509         case USB_RECIP_INTERFACE:
 510                 ret = checkintf(ps, index);
 511                 break;
 512         }
 513         return ret;
 514 }
 515
 516 static int __match_minor(struct device *dev, void *data)
 517 {
 518         int minor = *((int *)data);
 519
 520         if (dev->devt == MKDEV(USB_DEVICE_MAJOR, minor))
 521                 return 1;
 522         return 0;
 523 }
 524
 525 static struct usb_device *usbdev_lookup_by_minor(int minor)
 526 {
 527         struct device *dev;
 528
 529         dev = bus_find_device(&usb_bus_type, NULL, &minor, __match_minor);
 530         if (!dev)
 531                 return NULL;
 532         put_device(dev);
 533         return container_of(dev, struct usb_device, dev);
 534 }
 535
 536 /*
 537  * file operations
 538  */
 539 static int usbdev_open(struct inode *inode, struct file *file)
 540 {
 541         struct usb_device *dev = NULL;
 542         struct dev_state *ps;
 543         int ret;
 544
 545         /* Protect against simultaneous removal or release */
 546         mutex_lock(&usbfs_mutex);
 547
 548         ret = -ENOMEM;
 549         if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
 550                 goto out;
 551
 552         ret = -ENOENT;
 553         /* usbdev device-node */
 554         if (imajor(inode) == USB_DEVICE_MAJOR)
 555                 dev = usbdev_lookup_by_minor(iminor(inode));
 556 #ifdef CONFIG_USB_DEVICEFS
 557         /* procfs file */
 558         if (!dev)
 559                 dev = inode->i_private;
 560 #endif
 561         if (!dev)
 562                 goto out;
 563         ret = usb_autoresume_device(dev);
 564         if (ret)
 565                 goto out;
 566
 567         usb_get_dev(dev);
 568         ret = 0;
 569         ps->dev = dev;
 570         ps->file = file;
 571         spin_lock_init(&ps->lock);
 572         INIT_LIST_HEAD(&ps->list);
 573         INIT_LIST_HEAD(&ps->async_pending);
 574         INIT_LIST_HEAD(&ps->async_completed);
 575         init_waitqueue_head(&ps->wait);
 576         ps->discsignr = 0;
 577         ps->disc_pid = get_pid(task_pid(current));
 578         ps->disc_uid = current->uid;
 579         ps->disc_euid = current->euid;
 580         ps->disccontext = NULL;
 581         ps->ifclaimed = 0;
 582         security_task_getsecid(current, &ps->secid);
 583         smp_wmb();
 584         list_add_tail(&ps->list, &dev->filelist);
 585         file->private_data = ps;
 586  out:
 587         if (ret)
 588                 kfree(ps);
 589         mutex_unlock(&usbfs_mutex);
 590         return ret;
 591 }
 592
 593 static int usbdev_release(struct inode *inode, struct file *file)
 594 {
 595         struct dev_state *ps = file->private_data;
 596         struct usb_device *dev = ps->dev;
 597         unsigned int ifnum;
 598
 599         usb_lock_device(dev);
 600
 601         /* Protect against simultaneous open */
 602         mutex_lock(&usbfs_mutex);
 603         list_del_init(&ps->list);
 604         mutex_unlock(&usbfs_mutex);
 605
 606         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 607                         ifnum++) {
 608                 if (test_bit(ifnum, &ps->ifclaimed))
 609                         releaseintf(ps, ifnum);
 610         }
 611         destroy_all_async(ps);
 612         usb_autosuspend_device(dev);
 613         usb_unlock_device(dev);
 614         usb_put_dev(dev);
 615         put_pid(ps->disc_pid);
 616         kfree(ps);
 617         return 0;
 618 }
 619
 620 static int proc_control(struct dev_state *ps, void __user *arg)
 621 {
 622         struct usb_device *dev = ps->dev;
 623         struct usbdevfs_ctrltransfer ctrl;
 624         unsigned int tmo;
 625         unsigned char *tbuf;
 626         int i, j, ret;
 627
 628         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 629                 return -EFAULT;
 630         if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
 631                 return ret;
 632         if (ctrl.wLength > PAGE_SIZE)
 633                 return -EINVAL;
 634         if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
 635                 return -ENOMEM;
 636         tmo = ctrl.timeout;
 637         if (ctrl.bRequestType & 0x80) {
 638                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
 639                         free_page((unsigned long)tbuf);
 640                         return -EINVAL;
 641                 }
 642                 snoop(&dev->dev, "control read: bRequest=%02x "
 643                                 "bRrequestType=%02x wValue=%04x "
 644                                 "wIndex=%04x wLength=%04x\n",
 645                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 646                                 ctrl.wIndex, ctrl.wLength);
 647
 648                 usb_unlock_device(dev);
 649                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 650                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 651                 usb_lock_device(dev);
 652                 if ((i > 0) && ctrl.wLength) {
 653                         if (usbfs_snoop) {
 654                                 dev_info(&dev->dev, "control read: data ");
 655                                 for (j = 0; j < i; ++j)
 656                                         printk("%02x ", (unsigned char)(tbuf)[j]);
 657                                 printk("\n");
 658                         }
 659                         if (copy_to_user(ctrl.data, tbuf, i)) {
 660                                 free_page((unsigned long)tbuf);
 661                                 return -EFAULT;
 662                         }
 663                 }
 664         } else {
 665                 if (ctrl.wLength) {
 666                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 667                                 free_page((unsigned long)tbuf);
 668                                 return -EFAULT;
 669                         }
 670                 }
 671                 snoop(&dev->dev, "control write: bRequest=%02x "
 672                                 "bRrequestType=%02x wValue=%04x "
 673                                 "wIndex=%04x wLength=%04x\n",
 674                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 675                                 ctrl.wIndex, ctrl.wLength);
 676                 if (usbfs_snoop) {
 677                         dev_info(&dev->dev, "control write: data: ");
 678                         for (j = 0; j < ctrl.wLength; ++j)
 679                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 680                         printk("\n");
 681                 }
 682                 usb_unlock_device(dev);
 683                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 684                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 685                 usb_lock_device(dev);
 686         }
 687         free_page((unsigned long)tbuf);
 688         if (i<0 && i != -EPIPE) {
 689                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 690                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 691                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 692                            ctrl.wLength, i);
 693         }
 694         return i;
 695 }
 696
 697 static int proc_bulk(struct dev_state *ps, void __user *arg)
 698 {
 699         struct usb_device *dev = ps->dev;
 700         struct usbdevfs_bulktransfer bulk;
 701         unsigned int tmo, len1, pipe;
 702         int len2;
 703         unsigned char *tbuf;
 704         int i, j, ret;
 705
 706         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 707                 return -EFAULT;
 708         if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
 709                 return ret;
 710         if ((ret = checkintf(ps, ret)))
 711                 return ret;
 712         if (bulk.ep & USB_DIR_IN)
 713                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 714         else
 715                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 716         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 717                 return -EINVAL;
 718         len1 = bulk.len;
 719         if (len1 > MAX_USBFS_BUFFER_SIZE)
 720                 return -EINVAL;
 721         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 722                 return -ENOMEM;
 723         tmo = bulk.timeout;
 724         if (bulk.ep & 0x80) {
 725                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 726                         kfree(tbuf);
 727                         return -EINVAL;
 728                 }
 729                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
 730                         bulk.len, bulk.timeout);
 731                 usb_unlock_device(dev);
 732                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 733                 usb_lock_device(dev);
 734                 if (!i && len2) {
 735                         if (usbfs_snoop) {
 736                                 dev_info(&dev->dev, "bulk read: data ");
 737                                 for (j = 0; j < len2; ++j)
 738                                         printk("%02x ", (unsigned char)(tbuf)[j]);
 739                                 printk("\n");
 740                         }
 741                         if (copy_to_user(bulk.data, tbuf, len2)) {
 742                                 kfree(tbuf);
 743                                 return -EFAULT;
 744                         }
 745                 }
 746         } else {
 747                 if (len1) {
 748                         if (copy_from_user(tbuf, bulk.data, len1)) {
 749                                 kfree(tbuf);
 750                                 return -EFAULT;
 751                         }
 752                 }
 753                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
 754                         bulk.len, bulk.timeout);
 755                 if (usbfs_snoop) {
 756                         dev_info(&dev->dev, "bulk write: data: ");
 757                         for (j = 0; j < len1; ++j)
 758                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 759                         printk("\n");
 760                 }
 761                 usb_unlock_device(dev);
 762                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 763                 usb_lock_device(dev);
 764         }
 765         kfree(tbuf);
 766         if (i < 0)
 767                 return i;
 768         return len2;
 769 }
 770
 771 static int proc_resetep(struct dev_state *ps, void __user *arg)
 772 {
 773         unsigned int ep;
 774         int ret;
 775
 776         if (get_user(ep, (unsigned int __user *)arg))
 777                 return -EFAULT;
 778         if ((ret = findintfep(ps->dev, ep)) < 0)
 779                 return ret;
 780         if ((ret = checkintf(ps, ret)))
 781                 return ret;
 782         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
 783         return 0;
 784 }
 785
 786 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 787 {
 788         unsigned int ep;
 789         int pipe;
 790         int ret;
 791
 792         if (get_user(ep, (unsigned int __user *)arg))
 793                 return -EFAULT;
 794         if ((ret = findintfep(ps->dev, ep)) < 0)
 795                 return ret;
 796         if ((ret = checkintf(ps, ret)))
 797                 return ret;
 798         if (ep & USB_DIR_IN)
 799                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 800         else
 801                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 802
 803         return usb_clear_halt(ps->dev, pipe);
 804 }
 805
 806
 807 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 808 {
 809         struct usbdevfs_getdriver gd;
 810         struct usb_interface *intf;
 811         int ret;
 812
 813         if (copy_from_user(&gd, arg, sizeof(gd)))
 814                 return -EFAULT;
 815         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 816         if (!intf || !intf->dev.driver)
 817                 ret = -ENODATA;
 818         else {
 819                 strncpy(gd.driver, intf->dev.driver->name,
 820                                 sizeof(gd.driver));
 821                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 822         }
 823         return ret;
 824 }
 825
 826 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 827 {
 828         struct usbdevfs_connectinfo ci;
 829
 830         ci.devnum = ps->dev->devnum;
 831         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 832         if (copy_to_user(arg, &ci, sizeof(ci)))
 833                 return -EFAULT;
 834         return 0;
 835 }
 836
 837 static int proc_resetdevice(struct dev_state *ps)
 838 {
 839         return usb_reset_composite_device(ps->dev, NULL);
 840 }
 841
 842 static int proc_setintf(struct dev_state *ps, void __user *arg)
 843 {
 844         struct usbdevfs_setinterface setintf;
 845         int ret;
 846
 847         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 848                 return -EFAULT;
 849         if ((ret = checkintf(ps, setintf.interface)))
 850                 return ret;
 851         return usb_set_interface(ps->dev, setintf.interface,
 852                         setintf.altsetting);
 853 }
 854
 855 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 856 {
 857         int u;
 858         int status = 0;
 859         struct usb_host_config *actconfig;
 860
 861         if (get_user(u, (int __user *)arg))
 862                 return -EFAULT;
 863
 864         actconfig = ps->dev->actconfig;
 865
 866         /* Don't touch the device if any interfaces are claimed.
 867          * It could interfere with other drivers' operations, and if
 868          * an interface is claimed by usbfs it could easily deadlock.
 869          */
 870         if (actconfig) {
 871                 int i;
 872
 873                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 874                         if (usb_interface_claimed(actconfig->interface[i])) {
 875                                 dev_warn (&ps->dev->dev,
 876                                         "usbfs: interface %d claimed by %s "
 877                                         "while '%s' sets config #%d\n",
 878                                         actconfig->interface[i]
 879                                                 ->cur_altsetting
 880                                                 ->desc.bInterfaceNumber,
 881                                         actconfig->interface[i]
 882                                                 ->dev.driver->name,
 883                                         current->comm, u);
 884                                 status = -EBUSY;
 885                                 break;
 886                         }
 887                 }
 888         }
 889
 890         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 891          * so avoid usb_set_configuration()'s kick to sysfs
 892          */
 893         if (status == 0) {
 894                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 895                         status = usb_reset_configuration(ps->dev);
 896                 else
 897                         status = usb_set_configuration(ps->dev, u);
 898         }
 899
 900         return status;
 901 }
 902
 903 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 904                              struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
 905                              void __user *arg)
 906 {
 907         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 908         struct usb_host_endpoint *ep;
 909         struct async *as;
 910         struct usb_ctrlrequest *dr = NULL;
 911         unsigned int u, totlen, isofrmlen;
 912         int ret, ifnum = -1;
 913         int is_in;
 914
 915         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
 916                            URB_NO_FSBR|URB_ZERO_PACKET))
 917                 return -EINVAL;
 918         if (!uurb->buffer)
 919                 return -EINVAL;
 920         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
 921                 return -EINVAL;
 922         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
 923                 if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
 924                         return ifnum;
 925                 if ((ret = checkintf(ps, ifnum)))
 926                         return ret;
 927         }
 928         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
 929                 is_in = 1;
 930                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 931         } else {
 932                 is_in = 0;
 933                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 934         }
 935         if (!ep)
 936                 return -ENOENT;
 937         switch(uurb->type) {
 938         case USBDEVFS_URB_TYPE_CONTROL:
 939                 if (!usb_endpoint_xfer_control(&ep->desc))
 940                         return -EINVAL;
 941                 /* min 8 byte setup packet, max 8 byte setup plus an arbitrary data stage */
 942                 if (uurb->buffer_length < 8 || uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
 943                         return -EINVAL;
 944                 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
 945                         return -ENOMEM;
 946                 if (copy_from_user(dr, uurb->buffer, 8)) {
 947                         kfree(dr);
 948                         return -EFAULT;
 949                 }
 950                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
 951                         kfree(dr);
 952                         return -EINVAL;
 953                 }
 954                 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
 955                         kfree(dr);
 956                         return ret;
 957                 }
 958                 uurb->number_of_packets = 0;
 959                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
 960                 uurb->buffer += 8;
 961                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
 962                         is_in = 1;
 963                         uurb->endpoint |= USB_DIR_IN;
 964                 } else {
 965                         is_in = 0;
 966                         uurb->endpoint &= ~USB_DIR_IN;
 967                 }
 968                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
 969                                 uurb->buffer, uurb->buffer_length)) {
 970                         kfree(dr);
 971                         return -EFAULT;
 972                 }
 973                 snoop(&ps->dev->dev, "control urb: bRequest=%02x "
 974                         "bRrequestType=%02x wValue=%04x "
 975                         "wIndex=%04x wLength=%04x\n",
 976                         dr->bRequest, dr->bRequestType,
 977                         __le16_to_cpup(&dr->wValue),
 978                         __le16_to_cpup(&dr->wIndex),
 979                         __le16_to_cpup(&dr->wLength));
 980                 break;
 981
 982         case USBDEVFS_URB_TYPE_BULK:
 983                 switch (usb_endpoint_type(&ep->desc)) {
 984                 case USB_ENDPOINT_XFER_CONTROL:
 985                 case USB_ENDPOINT_XFER_ISOC:
 986                         return -EINVAL;
 987                 /* allow single-shot interrupt transfers, at bogus rates */
 988                 }
 989                 uurb->number_of_packets = 0;
 990                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
 991                         return -EINVAL;
 992                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
 993                                 uurb->buffer, uurb->buffer_length))
 994                         return -EFAULT;
 995                 snoop(&ps->dev->dev, "bulk urb\n");
 996                 break;
 997
 998         case USBDEVFS_URB_TYPE_ISO:
 999                 /* arbitrary limit */
1000                 if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
1001                         return -EINVAL;
1002                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1003                         return -EINVAL;
1004                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
1005                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1006                         return -ENOMEM;
1007                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1008                         kfree(isopkt);
1009                         return -EFAULT;
1010                 }
1011                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1012                         /* arbitrary limit, sufficient for USB 2.0 high-bandwidth iso */
1013                         if (isopkt[u].length > 8192) {
1014                                 kfree(isopkt);
1015                                 return -EINVAL;
1016                         }
1017                         totlen += isopkt[u].length;
1018                 }
1019                 if (totlen > 32768) {
1020                         kfree(isopkt);
1021                         return -EINVAL;
1022                 }
1023                 uurb->buffer_length = totlen;
1024                 snoop(&ps->dev->dev, "iso urb\n");
1025                 break;
1026
1027         case USBDEVFS_URB_TYPE_INTERRUPT:
1028                 uurb->number_of_packets = 0;
1029                 if (!usb_endpoint_xfer_int(&ep->desc))
1030                         return -EINVAL;
1031                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1032                         return -EINVAL;
1033                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1034                                 uurb->buffer, uurb->buffer_length))
1035                         return -EFAULT;
1036                 snoop(&ps->dev->dev, "interrupt urb\n");
1037                 break;
1038
1039         default:
1040                 return -EINVAL;
1041         }
1042         if (!(as = alloc_async(uurb->number_of_packets))) {
1043                 kfree(isopkt);
1044                 kfree(dr);
1045                 return -ENOMEM;
1046         }
1047         if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
1048                 kfree(isopkt);
1049                 kfree(dr);
1050                 free_async(as);
1051                 return -ENOMEM;
1052         }
1053         as->urb->dev = ps->dev;
1054         as->urb->pipe = (uurb->type << 30) |
1055                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1056                         (uurb->endpoint & USB_DIR_IN);
1057         as->urb->transfer_flags = uurb->flags |
1058                         (is_in ? URB_DIR_IN : URB_DIR_OUT);
1059         as->urb->transfer_buffer_length = uurb->buffer_length;
1060         as->urb->setup_packet = (unsigned char*)dr;
1061         as->urb->start_frame = uurb->start_frame;
1062         as->urb->number_of_packets = uurb->number_of_packets;
1063         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1064                         ps->dev->speed == USB_SPEED_HIGH)
1065                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1066         else
1067                 as->urb->interval = ep->desc.bInterval;
1068         as->urb->context = as;
1069         as->urb->complete = async_completed;
1070         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1071                 as->urb->iso_frame_desc[u].offset = totlen;
1072                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1073                 totlen += isopkt[u].length;
1074         }
1075         kfree(isopkt);
1076         as->ps = ps;
1077         as->userurb = arg;
1078         if (uurb->endpoint & USB_DIR_IN)
1079                 as->userbuffer = uurb->buffer;
1080         else
1081                 as->userbuffer = NULL;
1082         as->signr = uurb->signr;
1083         as->ifnum = ifnum;
1084         as->pid = get_pid(task_pid(current));
1085         as->uid = current->uid;
1086         as->euid = current->euid;
1087         security_task_getsecid(current, &as->secid);
1088         if (!is_in) {
1089                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1090                                 as->urb->transfer_buffer_length)) {
1091                         free_async(as);
1092                         return -EFAULT;
1093                 }
1094         }
1095         snoop_urb(as->urb, as->userurb);
1096         async_newpending(as);
1097         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1098                 dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
1099                 async_removepending(as);
1100                 free_async(as);
1101                 return ret;
1102         }
1103         return 0;
1104 }
1105
1106 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1107 {
1108         struct usbdevfs_urb uurb;
1109
1110         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1111                 return -EFAULT;
1112
1113         return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg);
1114 }
1115
1116 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1117 {
1118         struct async *as;
1119
1120         as = async_getpending(ps, arg);
1121         if (!as)
1122                 return -EINVAL;
1123         usb_kill_urb(as->urb);
1124         return 0;
1125 }
1126
1127 static int processcompl(struct async *as, void __user * __user *arg)
1128 {
1129         struct urb *urb = as->urb;
1130         struct usbdevfs_urb __user *userurb = as->userurb;
1131         void __user *addr = as->userurb;
1132         unsigned int i;
1133
1134         if (as->userbuffer)
1135                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1136                         return -EFAULT;
1137         if (put_user(as->status, &userurb->status))
1138                 return -EFAULT;
1139         if (put_user(urb->actual_length, &userurb->actual_length))
1140                 return -EFAULT;
1141         if (put_user(urb->error_count, &userurb->error_count))
1142                 return -EFAULT;
1143
1144         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1145                 for (i = 0; i < urb->number_of_packets; i++) {
1146                         if (put_user(urb->iso_frame_desc[i].actual_length,
1147                                      &userurb->iso_frame_desc[i].actual_length))
1148                                 return -EFAULT;
1149                         if (put_user(urb->iso_frame_desc[i].status,
1150                                      &userurb->iso_frame_desc[i].status))
1151                                 return -EFAULT;
1152                 }
1153         }
1154
1155         free_async(as);
1156
1157         if (put_user(addr, (void __user * __user *)arg))
1158                 return -EFAULT;
1159         return 0;
1160 }
1161
1162 static struct async* reap_as(struct dev_state *ps)
1163 {
1164         DECLARE_WAITQUEUE(wait, current);
1165         struct async *as = NULL;
1166         struct usb_device *dev = ps->dev;
1167
1168         add_wait_queue(&ps->wait, &wait);
1169         for (;;) {
1170                 __set_current_state(TASK_INTERRUPTIBLE);
1171                 if ((as = async_getcompleted(ps)))
1172                         break;
1173                 if (signal_pending(current))
1174                         break;
1175                 usb_unlock_device(dev);
1176                 schedule();
1177                 usb_lock_device(dev);
1178         }
1179         remove_wait_queue(&ps->wait, &wait);
1180         set_current_state(TASK_RUNNING);
1181         return as;
1182 }
1183
1184 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1185 {
1186         struct async *as = reap_as(ps);
1187         if (as)
1188                 return processcompl(as, (void __user * __user *)arg);
1189         if (signal_pending(current))
1190                 return -EINTR;
1191         return -EIO;
1192 }
1193
1194 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1195 {
1196         struct async *as;
1197
1198         if (!(as = async_getcompleted(ps)))
1199                 return -EAGAIN;
1200         return processcompl(as, (void __user * __user *)arg);
1201 }
1202
1203 #ifdef CONFIG_COMPAT
1204
1205 static int get_urb32(struct usbdevfs_urb *kurb,
1206                      struct usbdevfs_urb32 __user *uurb)
1207 {
1208         __u32  uptr;
1209         if (get_user(kurb->type, &uurb->type) ||
1210             __get_user(kurb->endpoint, &uurb->endpoint) ||
1211             __get_user(kurb->status, &uurb->status) ||
1212             __get_user(kurb->flags, &uurb->flags) ||
1213             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1214             __get_user(kurb->actual_length, &uurb->actual_length) ||
1215             __get_user(kurb->start_frame, &uurb->start_frame) ||
1216             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1217             __get_user(kurb->error_count, &uurb->error_count) ||
1218             __get_user(kurb->signr, &uurb->signr))
1219                 return -EFAULT;
1220
1221         if (__get_user(uptr, &uurb->buffer))
1222                 return -EFAULT;
1223         kurb->buffer = compat_ptr(uptr);
1224         if (__get_user(uptr, &uurb->buffer))
1225                 return -EFAULT;
1226         kurb->usercontext = compat_ptr(uptr);
1227
1228         return 0;
1229 }
1230
1231 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1232 {
1233         struct usbdevfs_urb uurb;
1234
1235         if (get_urb32(&uurb,(struct usbdevfs_urb32 __user *)arg))
1236                 return -EFAULT;
1237
1238         return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg);
1239 }
1240
1241 static int processcompl_compat(struct async *as, void __user * __user *arg)
1242 {
1243         struct urb *urb = as->urb;
1244         struct usbdevfs_urb32 __user *userurb = as->userurb;
1245         void __user *addr = as->userurb;
1246         unsigned int i;
1247
1248         if (as->userbuffer)
1249                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1250                         return -EFAULT;
1251         if (put_user(as->status, &userurb->status))
1252                 return -EFAULT;
1253         if (put_user(urb->actual_length, &userurb->actual_length))
1254                 return -EFAULT;
1255         if (put_user(urb->error_count, &userurb->error_count))
1256                 return -EFAULT;
1257
1258         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1259                 for (i = 0; i < urb->number_of_packets; i++) {
1260                         if (put_user(urb->iso_frame_desc[i].actual_length,
1261                                      &userurb->iso_frame_desc[i].actual_length))
1262                                 return -EFAULT;
1263                         if (put_user(urb->iso_frame_desc[i].status,
1264                                      &userurb->iso_frame_desc[i].status))
1265                                 return -EFAULT;
1266                 }
1267         }
1268
1269         free_async(as);
1270         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1271                 return -EFAULT;
1272         return 0;
1273 }
1274
1275 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1276 {
1277         struct async *as = reap_as(ps);
1278         if (as)
1279                 return processcompl_compat(as, (void __user * __user *)arg);
1280         if (signal_pending(current))
1281                 return -EINTR;
1282         return -EIO;
1283 }
1284
1285 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1286 {
1287         struct async *as;
1288
1289         if (!(as = async_getcompleted(ps)))
1290                 return -EAGAIN;
1291         return processcompl_compat(as, (void __user * __user *)arg);
1292 }
1293
1294 #endif
1295
1296 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1297 {
1298         struct usbdevfs_disconnectsignal ds;
1299
1300         if (copy_from_user(&ds, arg, sizeof(ds)))
1301                 return -EFAULT;
1302         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1303                 return -EINVAL;
1304         ps->discsignr = ds.signr;
1305         ps->disccontext = ds.context;
1306         return 0;
1307 }
1308
1309 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1310 {
1311         unsigned int ifnum;
1312
1313         if (get_user(ifnum, (unsigned int __user *)arg))
1314                 return -EFAULT;
1315         return claimintf(ps, ifnum);
1316 }
1317
1318 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1319 {
1320         unsigned int ifnum;
1321         int ret;
1322
1323         if (get_user(ifnum, (unsigned int __user *)arg))
1324                 return -EFAULT;
1325         if ((ret = releaseintf(ps, ifnum)) < 0)
1326                 return ret;
1327         destroy_async_on_interface (ps, ifnum);
1328         return 0;
1329 }
1330
1331 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1332 {
1333         int                     size;
1334         void                    *buf = NULL;
1335         int                     retval = 0;
1336         struct usb_interface    *intf = NULL;
1337         struct usb_driver       *driver = NULL;
1338
1339         /* alloc buffer */
1340         if ((size = _IOC_SIZE (ctl->ioctl_code)) > 0) {
1341                 if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
1342                         return -ENOMEM;
1343                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1344                         if (copy_from_user (buf, ctl->data, size)) {
1345                                 kfree(buf);
1346                                 return -EFAULT;
1347                         }
1348                 } else {
1349                         memset (buf, 0, size);
1350                 }
1351         }
1352
1353         if (!connected(ps)) {
1354                 kfree(buf);
1355                 return -ENODEV;
1356         }
1357
1358         if (ps->dev->state != USB_STATE_CONFIGURED)
1359                 retval = -EHOSTUNREACH;
1360         else if (!(intf = usb_ifnum_to_if (ps->dev, ctl->ifno)))
1361                retval = -EINVAL;
1362         else switch (ctl->ioctl_code) {
1363
1364         /* disconnect kernel driver from interface */
1365         case USBDEVFS_DISCONNECT:
1366                 if (intf->dev.driver) {
1367                         driver = to_usb_driver(intf->dev.driver);
1368                         dev_dbg (&intf->dev, "disconnect by usbfs\n");
1369                         usb_driver_release_interface(driver, intf);
1370                 } else
1371                         retval = -ENODATA;
1372                 break;
1373
1374         /* let kernel drivers try to (re)bind to the interface */
1375         case USBDEVFS_CONNECT:
1376                 usb_unlock_device(ps->dev);
1377                 retval = bus_rescan_devices(intf->dev.bus);
1378                 usb_lock_device(ps->dev);
1379                 break;
1380
1381         /* talk directly to the interface's driver */
1382         default:
1383                 if (intf->dev.driver)
1384                         driver = to_usb_driver(intf->dev.driver);
1385                 if (driver == NULL || driver->ioctl == NULL) {
1386                         retval = -ENOTTY;
1387                 } else {
1388                         retval = driver->ioctl (intf, ctl->ioctl_code, buf);
1389                         if (retval == -ENOIOCTLCMD)
1390                                 retval = -ENOTTY;
1391                 }
1392         }
1393
1394         /* cleanup and return */
1395         if (retval >= 0
1396                         && (_IOC_DIR (ctl->ioctl_code) & _IOC_READ) != 0
1397                         && size > 0
1398                         && copy_to_user (ctl->data, buf, size) != 0)
1399                 retval = -EFAULT;
1400
1401         kfree(buf);
1402         return retval;
1403 }
1404
1405 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1406 {
1407         struct usbdevfs_ioctl   ctrl;
1408
1409         if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
1410                 return -EFAULT;
1411         return proc_ioctl(ps, &ctrl);
1412 }
1413
1414 #ifdef CONFIG_COMPAT
1415 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1416 {
1417         struct usbdevfs_ioctl32 __user *uioc;
1418         struct usbdevfs_ioctl ctrl;
1419         u32 udata;
1420
1421         uioc = compat_ptr((long)arg);
1422         if (get_user(ctrl.ifno, &uioc->ifno) ||
1423             get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1424             __get_user(udata, &uioc->data))
1425                 return -EFAULT;
1426         ctrl.data = compat_ptr(udata);
1427
1428         return proc_ioctl(ps, &ctrl);
1429 }
1430 #endif
1431
1432 /*
1433  * NOTE:  All requests here that have interface numbers as parameters
1434  * are assuming that somehow the configuration has been prevented from
1435  * changing.  But there's no mechanism to ensure that...
1436  */
1437 static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1438 {
1439         struct dev_state *ps = file->private_data;
1440         struct usb_device *dev = ps->dev;
1441         void __user *p = (void __user *)arg;
1442         int ret = -ENOTTY;
1443
1444         if (!(file->f_mode & FMODE_WRITE))
1445                 return -EPERM;
1446         usb_lock_device(dev);
1447         if (!connected(ps)) {
1448                 usb_unlock_device(dev);
1449                 return -ENODEV;
1450         }
1451
1452         switch (cmd) {
1453         case USBDEVFS_CONTROL:
1454                 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
1455                 ret = proc_control(ps, p);
1456                 if (ret >= 0)
1457                         inode->i_mtime = CURRENT_TIME;
1458                 break;
1459
1460         case USBDEVFS_BULK:
1461                 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
1462                 ret = proc_bulk(ps, p);
1463                 if (ret >= 0)
1464                         inode->i_mtime = CURRENT_TIME;
1465                 break;
1466
1467         case USBDEVFS_RESETEP:
1468                 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
1469                 ret = proc_resetep(ps, p);
1470                 if (ret >= 0)
1471                         inode->i_mtime = CURRENT_TIME;
1472                 break;
1473
1474         case USBDEVFS_RESET:
1475                 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
1476                 ret = proc_resetdevice(ps);
1477                 break;
1478
1479         case USBDEVFS_CLEAR_HALT:
1480                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
1481                 ret = proc_clearhalt(ps, p);
1482                 if (ret >= 0)
1483                         inode->i_mtime = CURRENT_TIME;
1484                 break;
1485
1486         case USBDEVFS_GETDRIVER:
1487                 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
1488                 ret = proc_getdriver(ps, p);
1489                 break;
1490
1491         case USBDEVFS_CONNECTINFO:
1492                 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
1493                 ret = proc_connectinfo(ps, p);
1494                 break;
1495
1496         case USBDEVFS_SETINTERFACE:
1497                 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
1498                 ret = proc_setintf(ps, p);
1499                 break;
1500
1501         case USBDEVFS_SETCONFIGURATION:
1502                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
1503                 ret = proc_setconfig(ps, p);
1504                 break;
1505
1506         case USBDEVFS_SUBMITURB:
1507                 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
1508                 ret = proc_submiturb(ps, p);
1509                 if (ret >= 0)
1510                         inode->i_mtime = CURRENT_TIME;
1511                 break;
1512
1513 #ifdef CONFIG_COMPAT
1514
1515         case USBDEVFS_SUBMITURB32:
1516                 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
1517                 ret = proc_submiturb_compat(ps, p);
1518                 if (ret >= 0)
1519                         inode->i_mtime = CURRENT_TIME;
1520                 break;
1521
1522         case USBDEVFS_REAPURB32:
1523                 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
1524                 ret = proc_reapurb_compat(ps, p);
1525                 break;
1526
1527         case USBDEVFS_REAPURBNDELAY32:
1528                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
1529                 ret = proc_reapurbnonblock_compat(ps, p);
1530                 break;
1531
1532         case USBDEVFS_IOCTL32:
1533                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1534                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1535                 break;
1536 #endif
1537
1538         case USBDEVFS_DISCARDURB:
1539                 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
1540                 ret = proc_unlinkurb(ps, p);
1541                 break;
1542
1543         case USBDEVFS_REAPURB:
1544                 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
1545                 ret = proc_reapurb(ps, p);
1546                 break;
1547
1548         case USBDEVFS_REAPURBNDELAY:
1549                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
1550                 ret = proc_reapurbnonblock(ps, p);
1551                 break;
1552
1553         case USBDEVFS_DISCSIGNAL:
1554                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
1555                 ret = proc_disconnectsignal(ps, p);
1556                 break;
1557
1558         case USBDEVFS_CLAIMINTERFACE:
1559                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
1560                 ret = proc_claiminterface(ps, p);
1561                 break;
1562
1563         case USBDEVFS_RELEASEINTERFACE:
1564                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
1565                 ret = proc_releaseinterface(ps, p);
1566                 break;
1567
1568         case USBDEVFS_IOCTL:
1569                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1570                 ret = proc_ioctl_default(ps, p);
1571                 break;
1572         }
1573         usb_unlock_device(dev);
1574         if (ret >= 0)
1575                 inode->i_atime = CURRENT_TIME;
1576         return ret;
1577 }
1578
1579 /* No kernel lock - fine */
1580 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
1581 {
1582         struct dev_state *ps = file->private_data;
1583         unsigned int mask = 0;
1584
1585         poll_wait(file, &ps->wait, wait);
1586         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1587                 mask |= POLLOUT | POLLWRNORM;
1588         if (!connected(ps))
1589                 mask |= POLLERR | POLLHUP;
1590         return mask;
1591 }
1592
1593 const struct file_operations usbdev_file_operations = {
1594         .owner =        THIS_MODULE,
1595         .llseek =       usbdev_lseek,
1596         .read =         usbdev_read,
1597         .poll =         usbdev_poll,
1598         .ioctl =        usbdev_ioctl,
1599         .open =         usbdev_open,
1600         .release =      usbdev_release,
1601 };
1602
1603 #ifdef CONFIG_USB_DEVICE_CLASS
1604 static struct class *usb_classdev_class;
1605
1606 static int usb_classdev_add(struct usb_device *dev)
1607 {
1608         int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1609
1610         dev->usb_classdev = device_create(usb_classdev_class, &dev->dev,
1611                                 MKDEV(USB_DEVICE_MAJOR, minor),
1612                                 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1613         if (IS_ERR(dev->usb_classdev))
1614                 return PTR_ERR(dev->usb_classdev);
1615
1616         return 0;
1617 }
1618
1619 static void usb_classdev_remove(struct usb_device *dev)
1620 {
1621         device_unregister(dev->usb_classdev);
1622 }
1623
1624 static int usb_classdev_notify(struct notifier_block *self,
1625                                unsigned long action, void *dev)
1626 {
1627         switch (action) {
1628         case USB_DEVICE_ADD:
1629                 if (usb_classdev_add(dev))
1630                         return NOTIFY_BAD;
1631                 break;
1632         case USB_DEVICE_REMOVE:
1633                 usb_classdev_remove(dev);
1634                 break;
1635         }
1636         return NOTIFY_OK;
1637 }
1638
1639 static struct notifier_block usbdev_nb = {
1640         .notifier_call =        usb_classdev_notify,
1641 };
1642 #endif
1643
1644 static struct cdev usb_device_cdev;
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 }