git.oblomov.eu Git - linux-2.6/blob - drivers/usb/core/devio.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *      devio.c  --  User space communication with USB devices.
   5  *
   6  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   7  *
   8  *      This program is free software; you can redistribute it and/or modify
   9  *      it under the terms of the GNU General Public License as published by
  10  *      the Free Software Foundation; either version 2 of the License, or
  11  *      (at your option) any later version.
  12  *
  13  *      This program is distributed in the hope that it will be useful,
  14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *      GNU General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License
  19  *      along with this program; if not, write to the Free Software
  20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  *  $Id: devio.c,v 1.7 2000/02/01 17:28:48 fliegl Exp $
  23  *
  24  *  This file implements the usbfs/x/y files, where
  25  *  x is the bus number and y the device number.
  26  *
  27  *  It allows user space programs/"drivers" to communicate directly
  28  *  with USB devices without intervening kernel driver.
  29  *
  30  *  Revision history
  31  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  32  *    04.01.2000   0.2   Turned into its own filesystem
  33  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  34  *                       (CAN-2005-3055)
  35  */
  36
  37 /*****************************************************************************/
  38
  39 #include <linux/fs.h>
  40 #include <linux/mm.h>
  41 #include <linux/slab.h>
  42 #include <linux/smp_lock.h>
  43 #include <linux/signal.h>
  44 #include <linux/poll.h>
  45 #include <linux/module.h>
  46 #include <linux/usb.h>
  47 #include <linux/usbdevice_fs.h>
  48 #include <linux/cdev.h>
  49 #include <linux/notifier.h>
  50 #include <linux/security.h>
  51 #include <asm/uaccess.h>
  52 #include <asm/byteorder.h>
  53 #include <linux/moduleparam.h>
  54
  55 #include "hcd.h"        /* for usbcore internals */
  56 #include "usb.h"
  57
  58 #define USB_MAXBUS                      64
  59 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
  60
  61 /* Mutual exclusion for removal, open, and release */
  62 DEFINE_MUTEX(usbfs_mutex);
  63
  64 struct async {
  65         struct list_head asynclist;
  66         struct dev_state *ps;
  67         struct pid *pid;
  68         uid_t uid, euid;
  69         unsigned int signr;
  70         unsigned int ifnum;
  71         void __user *userbuffer;
  72         void __user *userurb;
  73         struct urb *urb;
  74         u32 secid;
  75 };
  76
  77 static int usbfs_snoop = 0;
  78 module_param (usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  79 MODULE_PARM_DESC (usbfs_snoop, "true to log all usbfs traffic");
  80
  81 #define snoop(dev, format, arg...)                              \
  82         do {                                                    \
  83                 if (usbfs_snoop)                                \
  84                         dev_info( dev , format , ## arg);       \
  85         } while (0)
  86
  87 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
  88
  89
  90 #define MAX_USBFS_BUFFER_SIZE   16384
  91
  92 static inline int connected (struct dev_state *ps)
  93 {
  94         return (!list_empty(&ps->list) &&
  95                         ps->dev->state != USB_STATE_NOTATTACHED);
  96 }
  97
  98 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
  99 {
 100         loff_t ret;
 101
 102         lock_kernel();
 103
 104         switch (orig) {
 105         case 0:
 106                 file->f_pos = offset;
 107                 ret = file->f_pos;
 108                 break;
 109         case 1:
 110                 file->f_pos += offset;
 111                 ret = file->f_pos;
 112                 break;
 113         case 2:
 114         default:
 115                 ret = -EINVAL;
 116         }
 117
 118         unlock_kernel();
 119         return ret;
 120 }
 121
 122 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
 123 {
 124         struct dev_state *ps = file->private_data;
 125         struct usb_device *dev = ps->dev;
 126         ssize_t ret = 0;
 127         unsigned len;
 128         loff_t pos;
 129         int i;
 130
 131         pos = *ppos;
 132         usb_lock_device(dev);
 133         if (!connected(ps)) {
 134                 ret = -ENODEV;
 135                 goto err;
 136         } else if (pos < 0) {
 137                 ret = -EINVAL;
 138                 goto err;
 139         }
 140
 141         if (pos < sizeof(struct usb_device_descriptor)) {
 142                 struct usb_device_descriptor temp_desc ; /* 18 bytes - fits on the stack */
 143
 144                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 145                 le16_to_cpus(&temp_desc.bcdUSB);
 146                 le16_to_cpus(&temp_desc.idVendor);
 147                 le16_to_cpus(&temp_desc.idProduct);
 148                 le16_to_cpus(&temp_desc.bcdDevice);
 149
 150                 len = sizeof(struct usb_device_descriptor) - pos;
 151                 if (len > nbytes)
 152                         len = nbytes;
 153                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 154                         ret = -EFAULT;
 155                         goto err;
 156                 }
 157
 158                 *ppos += len;
 159                 buf += len;
 160                 nbytes -= len;
 161                 ret += len;
 162         }
 163
 164         pos = sizeof(struct usb_device_descriptor);
 165         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 166                 struct usb_config_descriptor *config =
 167                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 168                 unsigned int length = le16_to_cpu(config->wTotalLength);
 169
 170                 if (*ppos < pos + length) {
 171
 172                         /* The descriptor may claim to be longer than it
 173                          * really is.  Here is the actual allocated length. */
 174                         unsigned alloclen =
 175                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 176
 177                         len = length - (*ppos - pos);
 178                         if (len > nbytes)
 179                                 len = nbytes;
 180
 181                         /* Simply don't write (skip over) unallocated parts */
 182                         if (alloclen > (*ppos - pos)) {
 183                                 alloclen -= (*ppos - pos);
 184                                 if (copy_to_user(buf,
 185                                     dev->rawdescriptors[i] + (*ppos - pos),
 186                                     min(len, alloclen))) {
 187                                         ret = -EFAULT;
 188                                         goto err;
 189                                 }
 190                         }
 191
 192                         *ppos += len;
 193                         buf += len;
 194                         nbytes -= len;
 195                         ret += len;
 196                 }
 197
 198                 pos += length;
 199         }
 200
 201 err:
 202         usb_unlock_device(dev);
 203         return ret;
 204 }
 205
 206 /*
 207  * async list handling
 208  */
 209
 210 static struct async *alloc_async(unsigned int numisoframes)
 211 {
 212         unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor);
 213         struct async *as = kzalloc(assize, GFP_KERNEL);
 214
 215         if (!as)
 216                 return NULL;
 217         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 218         if (!as->urb) {
 219                 kfree(as);
 220                 return NULL;
 221         }
 222         return as;
 223 }
 224
 225 static void free_async(struct async *as)
 226 {
 227         put_pid(as->pid);
 228         kfree(as->urb->transfer_buffer);
 229         kfree(as->urb->setup_packet);
 230         usb_free_urb(as->urb);
 231         kfree(as);
 232 }
 233
 234 static inline void async_newpending(struct async *as)
 235 {
 236         struct dev_state *ps = as->ps;
 237         unsigned long flags;
 238
 239         spin_lock_irqsave(&ps->lock, flags);
 240         list_add_tail(&as->asynclist, &ps->async_pending);
 241         spin_unlock_irqrestore(&ps->lock, flags);
 242 }
 243
 244 static inline void async_removepending(struct async *as)
 245 {
 246         struct dev_state *ps = as->ps;
 247         unsigned long flags;
 248
 249         spin_lock_irqsave(&ps->lock, flags);
 250         list_del_init(&as->asynclist);
 251         spin_unlock_irqrestore(&ps->lock, flags);
 252 }
 253
 254 static inline struct async *async_getcompleted(struct dev_state *ps)
 255 {
 256         unsigned long flags;
 257         struct async *as = NULL;
 258
 259         spin_lock_irqsave(&ps->lock, flags);
 260         if (!list_empty(&ps->async_completed)) {
 261                 as = list_entry(ps->async_completed.next, struct async, asynclist);
 262                 list_del_init(&as->asynclist);
 263         }
 264         spin_unlock_irqrestore(&ps->lock, flags);
 265         return as;
 266 }
 267
 268 static inline struct async *async_getpending(struct dev_state *ps, void __user *userurb)
 269 {
 270         unsigned long flags;
 271         struct async *as;
 272
 273         spin_lock_irqsave(&ps->lock, flags);
 274         list_for_each_entry(as, &ps->async_pending, asynclist)
 275                 if (as->userurb == userurb) {
 276                         list_del_init(&as->asynclist);
 277                         spin_unlock_irqrestore(&ps->lock, flags);
 278                         return as;
 279                 }
 280         spin_unlock_irqrestore(&ps->lock, flags);
 281         return NULL;
 282 }
 283
 284 static void snoop_urb(struct urb *urb, void __user *userurb)
 285 {
 286         int j;
 287         unsigned char *data = urb->transfer_buffer;
 288
 289         if (!usbfs_snoop)
 290                 return;
 291
 292         if (urb->pipe & USB_DIR_IN)
 293                 dev_info(&urb->dev->dev, "direction=IN\n");
 294         else
 295                 dev_info(&urb->dev->dev, "direction=OUT\n");
 296         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
 297         dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
 298                  urb->transfer_buffer_length);
 299         dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
 300         dev_info(&urb->dev->dev, "data: ");
 301         for (j = 0; j < urb->transfer_buffer_length; ++j)
 302                 printk ("%02x ", data[j]);
 303         printk("\n");
 304 }
 305
 306 static void async_completed(struct urb *urb)
 307 {
 308         struct async *as = urb->context;
 309         struct dev_state *ps = as->ps;
 310         struct siginfo sinfo;
 311
 312         spin_lock(&ps->lock);
 313         list_move_tail(&as->asynclist, &ps->async_completed);
 314         spin_unlock(&ps->lock);
 315         if (as->signr) {
 316                 sinfo.si_signo = as->signr;
 317                 sinfo.si_errno = as->urb->status;
 318                 sinfo.si_code = SI_ASYNCIO;
 319                 sinfo.si_addr = as->userurb;
 320                 kill_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
 914         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
 915                            URB_NO_FSBR|URB_ZERO_PACKET))
 916                 return -EINVAL;
 917         if (!uurb->buffer)
 918                 return -EINVAL;
 919         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
 920                 return -EINVAL;
 921         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
 922                 if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
 923                         return ifnum;
 924                 if ((ret = checkintf(ps, ifnum)))
 925                         return ret;
 926         }
 927         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0)
 928                 ep = ps->dev->ep_in [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 929         else
 930                 ep = ps->dev->ep_out [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 931         if (!ep)
 932                 return -ENOENT;
 933         switch(uurb->type) {
 934         case USBDEVFS_URB_TYPE_CONTROL:
 935                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 936                                 != USB_ENDPOINT_XFER_CONTROL)
 937                         return -EINVAL;
 938                 /* min 8 byte setup packet, max 8 byte setup plus an arbitrary data stage */
 939                 if (uurb->buffer_length < 8 || uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
 940                         return -EINVAL;
 941                 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
 942                         return -ENOMEM;
 943                 if (copy_from_user(dr, uurb->buffer, 8)) {
 944                         kfree(dr);
 945                         return -EFAULT;
 946                 }
 947                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
 948                         kfree(dr);
 949                         return -EINVAL;
 950                 }
 951                 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
 952                         kfree(dr);
 953                         return ret;
 954                 }
 955                 uurb->endpoint = (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK);
 956                 uurb->number_of_packets = 0;
 957                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
 958                 uurb->buffer += 8;
 959                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ?  VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) {
 960                         kfree(dr);
 961                         return -EFAULT;
 962                 }
 963                 snoop(&ps->dev->dev, "control urb: bRequest=%02x "
 964                         "bRrequestType=%02x wValue=%04x "
 965                         "wIndex=%04x wLength=%04x\n",
 966                         dr->bRequest, dr->bRequestType, dr->wValue,
 967                         dr->wIndex, dr->wLength);
 968                 break;
 969
 970         case USBDEVFS_URB_TYPE_BULK:
 971                 switch (ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 972                 case USB_ENDPOINT_XFER_CONTROL:
 973                 case USB_ENDPOINT_XFER_ISOC:
 974                         return -EINVAL;
 975                 /* allow single-shot interrupt transfers, at bogus rates */
 976                 }
 977                 uurb->number_of_packets = 0;
 978                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
 979                         return -EINVAL;
 980                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
 981                         return -EFAULT;
 982                 snoop(&ps->dev->dev, "bulk urb\n");
 983                 break;
 984
 985         case USBDEVFS_URB_TYPE_ISO:
 986                 /* arbitrary limit */
 987                 if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
 988                         return -EINVAL;
 989                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 990                                 != USB_ENDPOINT_XFER_ISOC)
 991                         return -EINVAL;
 992                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
 993                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
 994                         return -ENOMEM;
 995                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
 996                         kfree(isopkt);
 997                         return -EFAULT;
 998                 }
 999                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1000                         /* arbitrary limit, sufficient for USB 2.0 high-bandwidth iso */
1001                         if (isopkt[u].length > 8192) {
1002                                 kfree(isopkt);
1003                                 return -EINVAL;
1004                         }
1005                         totlen += isopkt[u].length;
1006                 }
1007                 if (totlen > 32768) {
1008                         kfree(isopkt);
1009                         return -EINVAL;
1010                 }
1011                 uurb->buffer_length = totlen;
1012                 snoop(&ps->dev->dev, "iso urb\n");
1013                 break;
1014
1015         case USBDEVFS_URB_TYPE_INTERRUPT:
1016                 uurb->number_of_packets = 0;
1017                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
1018                                 != USB_ENDPOINT_XFER_INT)
1019                         return -EINVAL;
1020                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1021                         return -EINVAL;
1022                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
1023                         return -EFAULT;
1024                 snoop(&ps->dev->dev, "interrupt urb\n");
1025                 break;
1026
1027         default:
1028                 return -EINVAL;
1029         }
1030         if (!(as = alloc_async(uurb->number_of_packets))) {
1031                 kfree(isopkt);
1032                 kfree(dr);
1033                 return -ENOMEM;
1034         }
1035         if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
1036                 kfree(isopkt);
1037                 kfree(dr);
1038                 free_async(as);
1039                 return -ENOMEM;
1040         }
1041         as->urb->dev = ps->dev;
1042         as->urb->pipe = (uurb->type << 30) | __create_pipe(ps->dev, uurb->endpoint & 0xf) | (uurb->endpoint & USB_DIR_IN);
1043         as->urb->transfer_flags = uurb->flags;
1044         as->urb->transfer_buffer_length = uurb->buffer_length;
1045         as->urb->setup_packet = (unsigned char*)dr;
1046         as->urb->start_frame = uurb->start_frame;
1047         as->urb->number_of_packets = uurb->number_of_packets;
1048         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1049                         ps->dev->speed == USB_SPEED_HIGH)
1050                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1051         else
1052                 as->urb->interval = ep->desc.bInterval;
1053         as->urb->context = as;
1054         as->urb->complete = async_completed;
1055         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1056                 as->urb->iso_frame_desc[u].offset = totlen;
1057                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1058                 totlen += isopkt[u].length;
1059         }
1060         kfree(isopkt);
1061         as->ps = ps;
1062         as->userurb = arg;
1063         if (uurb->endpoint & USB_DIR_IN)
1064                 as->userbuffer = uurb->buffer;
1065         else
1066                 as->userbuffer = NULL;
1067         as->signr = uurb->signr;
1068         as->ifnum = ifnum;
1069         as->pid = get_pid(task_pid(current));
1070         as->uid = current->uid;
1071         as->euid = current->euid;
1072         security_task_getsecid(current, &as->secid);
1073         if (!(uurb->endpoint & USB_DIR_IN)) {
1074                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, as->urb->transfer_buffer_length)) {
1075                         free_async(as);
1076                         return -EFAULT;
1077                 }
1078         }
1079         snoop(&as->urb->dev->dev, "submit urb\n");
1080         snoop_urb(as->urb, as->userurb);
1081         async_newpending(as);
1082         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1083                 dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
1084                 async_removepending(as);
1085                 free_async(as);
1086                 return ret;
1087         }
1088         return 0;
1089 }
1090
1091 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1092 {
1093         struct usbdevfs_urb uurb;
1094
1095         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1096                 return -EFAULT;
1097
1098         return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg);
1099 }
1100
1101 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1102 {
1103         struct async *as;
1104
1105         as = async_getpending(ps, arg);
1106         if (!as)
1107                 return -EINVAL;
1108         usb_kill_urb(as->urb);
1109         return 0;
1110 }
1111
1112 static int processcompl(struct async *as, void __user * __user *arg)
1113 {
1114         struct urb *urb = as->urb;
1115         struct usbdevfs_urb __user *userurb = as->userurb;
1116         void __user *addr = as->userurb;
1117         unsigned int i;
1118
1119         if (as->userbuffer)
1120                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1121                         return -EFAULT;
1122         if (put_user(urb->status, &userurb->status))
1123                 return -EFAULT;
1124         if (put_user(urb->actual_length, &userurb->actual_length))
1125                 return -EFAULT;
1126         if (put_user(urb->error_count, &userurb->error_count))
1127                 return -EFAULT;
1128
1129         if (usb_pipeisoc(urb->pipe)) {
1130                 for (i = 0; i < urb->number_of_packets; i++) {
1131                         if (put_user(urb->iso_frame_desc[i].actual_length,
1132                                      &userurb->iso_frame_desc[i].actual_length))
1133                                 return -EFAULT;
1134                         if (put_user(urb->iso_frame_desc[i].status,
1135                                      &userurb->iso_frame_desc[i].status))
1136                                 return -EFAULT;
1137                 }
1138         }
1139
1140         free_async(as);
1141
1142         if (put_user(addr, (void __user * __user *)arg))
1143                 return -EFAULT;
1144         return 0;
1145 }
1146
1147 static struct async* reap_as(struct dev_state *ps)
1148 {
1149         DECLARE_WAITQUEUE(wait, current);
1150         struct async *as = NULL;
1151         struct usb_device *dev = ps->dev;
1152
1153         add_wait_queue(&ps->wait, &wait);
1154         for (;;) {
1155                 __set_current_state(TASK_INTERRUPTIBLE);
1156                 if ((as = async_getcompleted(ps)))
1157                         break;
1158                 if (signal_pending(current))
1159                         break;
1160                 usb_unlock_device(dev);
1161                 schedule();
1162                 usb_lock_device(dev);
1163         }
1164         remove_wait_queue(&ps->wait, &wait);
1165         set_current_state(TASK_RUNNING);
1166         return as;
1167 }
1168
1169 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1170 {
1171         struct async *as = reap_as(ps);
1172         if (as)
1173                 return processcompl(as, (void __user * __user *)arg);
1174         if (signal_pending(current))
1175                 return -EINTR;
1176         return -EIO;
1177 }
1178
1179 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1180 {
1181         struct async *as;
1182
1183         if (!(as = async_getcompleted(ps)))
1184                 return -EAGAIN;
1185         return processcompl(as, (void __user * __user *)arg);
1186 }
1187
1188 #ifdef CONFIG_COMPAT
1189
1190 static int get_urb32(struct usbdevfs_urb *kurb,
1191                      struct usbdevfs_urb32 __user *uurb)
1192 {
1193         __u32  uptr;
1194         if (get_user(kurb->type, &uurb->type) ||
1195             __get_user(kurb->endpoint, &uurb->endpoint) ||
1196             __get_user(kurb->status, &uurb->status) ||
1197             __get_user(kurb->flags, &uurb->flags) ||
1198             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1199             __get_user(kurb->actual_length, &uurb->actual_length) ||
1200             __get_user(kurb->start_frame, &uurb->start_frame) ||
1201             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1202             __get_user(kurb->error_count, &uurb->error_count) ||
1203             __get_user(kurb->signr, &uurb->signr))
1204                 return -EFAULT;
1205
1206         if (__get_user(uptr, &uurb->buffer))
1207                 return -EFAULT;
1208         kurb->buffer = compat_ptr(uptr);
1209         if (__get_user(uptr, &uurb->buffer))
1210                 return -EFAULT;
1211         kurb->usercontext = compat_ptr(uptr);
1212
1213         return 0;
1214 }
1215
1216 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1217 {
1218         struct usbdevfs_urb uurb;
1219
1220         if (get_urb32(&uurb,(struct usbdevfs_urb32 __user *)arg))
1221                 return -EFAULT;
1222
1223         return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg);
1224 }
1225
1226 static int processcompl_compat(struct async *as, void __user * __user *arg)
1227 {
1228         struct urb *urb = as->urb;
1229         struct usbdevfs_urb32 __user *userurb = as->userurb;
1230         void __user *addr = as->userurb;
1231         unsigned int i;
1232
1233         if (as->userbuffer)
1234                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1235                         return -EFAULT;
1236         if (put_user(urb->status, &userurb->status))
1237                 return -EFAULT;
1238         if (put_user(urb->actual_length, &userurb->actual_length))
1239                 return -EFAULT;
1240         if (put_user(urb->error_count, &userurb->error_count))
1241                 return -EFAULT;
1242
1243         if (usb_pipeisoc(urb->pipe)) {
1244                 for (i = 0; i < urb->number_of_packets; i++) {
1245                         if (put_user(urb->iso_frame_desc[i].actual_length,
1246                                      &userurb->iso_frame_desc[i].actual_length))
1247                                 return -EFAULT;
1248                         if (put_user(urb->iso_frame_desc[i].status,
1249                                      &userurb->iso_frame_desc[i].status))
1250                                 return -EFAULT;
1251                 }
1252         }
1253
1254         free_async(as);
1255         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1256                 return -EFAULT;
1257         return 0;
1258 }
1259
1260 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1261 {
1262         struct async *as = reap_as(ps);
1263         if (as)
1264                 return processcompl_compat(as, (void __user * __user *)arg);
1265         if (signal_pending(current))
1266                 return -EINTR;
1267         return -EIO;
1268 }
1269
1270 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1271 {
1272         struct async *as;
1273
1274         if (!(as = async_getcompleted(ps)))
1275                 return -EAGAIN;
1276         return processcompl_compat(as, (void __user * __user *)arg);
1277 }
1278
1279 #endif
1280
1281 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1282 {
1283         struct usbdevfs_disconnectsignal ds;
1284
1285         if (copy_from_user(&ds, arg, sizeof(ds)))
1286                 return -EFAULT;
1287         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1288                 return -EINVAL;
1289         ps->discsignr = ds.signr;
1290         ps->disccontext = ds.context;
1291         return 0;
1292 }
1293
1294 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1295 {
1296         unsigned int ifnum;
1297
1298         if (get_user(ifnum, (unsigned int __user *)arg))
1299                 return -EFAULT;
1300         return claimintf(ps, ifnum);
1301 }
1302
1303 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1304 {
1305         unsigned int ifnum;
1306         int ret;
1307
1308         if (get_user(ifnum, (unsigned int __user *)arg))
1309                 return -EFAULT;
1310         if ((ret = releaseintf(ps, ifnum)) < 0)
1311                 return ret;
1312         destroy_async_on_interface (ps, ifnum);
1313         return 0;
1314 }
1315
1316 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1317 {
1318         int                     size;
1319         void                    *buf = NULL;
1320         int                     retval = 0;
1321         struct usb_interface    *intf = NULL;
1322         struct usb_driver       *driver = NULL;
1323
1324         /* alloc buffer */
1325         if ((size = _IOC_SIZE (ctl->ioctl_code)) > 0) {
1326                 if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
1327                         return -ENOMEM;
1328                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1329                         if (copy_from_user (buf, ctl->data, size)) {
1330                                 kfree(buf);
1331                                 return -EFAULT;
1332                         }
1333                 } else {
1334                         memset (buf, 0, size);
1335                 }
1336         }
1337
1338         if (!connected(ps)) {
1339                 kfree(buf);
1340                 return -ENODEV;
1341         }
1342
1343         if (ps->dev->state != USB_STATE_CONFIGURED)
1344                 retval = -EHOSTUNREACH;
1345         else if (!(intf = usb_ifnum_to_if (ps->dev, ctl->ifno)))
1346                retval = -EINVAL;
1347         else switch (ctl->ioctl_code) {
1348
1349         /* disconnect kernel driver from interface */
1350         case USBDEVFS_DISCONNECT:
1351                 if (intf->dev.driver) {
1352                         driver = to_usb_driver(intf->dev.driver);
1353                         dev_dbg (&intf->dev, "disconnect by usbfs\n");
1354                         usb_driver_release_interface(driver, intf);
1355                 } else
1356                         retval = -ENODATA;
1357                 break;
1358
1359         /* let kernel drivers try to (re)bind to the interface */
1360         case USBDEVFS_CONNECT:
1361                 usb_unlock_device(ps->dev);
1362                 retval = bus_rescan_devices(intf->dev.bus);
1363                 usb_lock_device(ps->dev);
1364                 break;
1365
1366         /* talk directly to the interface's driver */
1367         default:
1368                 if (intf->dev.driver)
1369                         driver = to_usb_driver(intf->dev.driver);
1370                 if (driver == NULL || driver->ioctl == NULL) {
1371                         retval = -ENOTTY;
1372                 } else {
1373                         retval = driver->ioctl (intf, ctl->ioctl_code, buf);
1374                         if (retval == -ENOIOCTLCMD)
1375                                 retval = -ENOTTY;
1376                 }
1377         }
1378
1379         /* cleanup and return */
1380         if (retval >= 0
1381                         && (_IOC_DIR (ctl->ioctl_code) & _IOC_READ) != 0
1382                         && size > 0
1383                         && copy_to_user (ctl->data, buf, size) != 0)
1384                 retval = -EFAULT;
1385
1386         kfree(buf);
1387         return retval;
1388 }
1389
1390 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1391 {
1392         struct usbdevfs_ioctl   ctrl;
1393
1394         if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
1395                 return -EFAULT;
1396         return proc_ioctl(ps, &ctrl);
1397 }
1398
1399 #ifdef CONFIG_COMPAT
1400 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1401 {
1402         struct usbdevfs_ioctl32 __user *uioc;
1403         struct usbdevfs_ioctl ctrl;
1404         u32 udata;
1405
1406         uioc = compat_ptr((long)arg);
1407         if (get_user(ctrl.ifno, &uioc->ifno) ||
1408             get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1409             __get_user(udata, &uioc->data))
1410                 return -EFAULT;
1411         ctrl.data = compat_ptr(udata);
1412
1413         return proc_ioctl(ps, &ctrl);
1414 }
1415 #endif
1416
1417 /*
1418  * NOTE:  All requests here that have interface numbers as parameters
1419  * are assuming that somehow the configuration has been prevented from
1420  * changing.  But there's no mechanism to ensure that...
1421  */
1422 static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1423 {
1424         struct dev_state *ps = file->private_data;
1425         struct usb_device *dev = ps->dev;
1426         void __user *p = (void __user *)arg;
1427         int ret = -ENOTTY;
1428
1429         if (!(file->f_mode & FMODE_WRITE))
1430                 return -EPERM;
1431         usb_lock_device(dev);
1432         if (!connected(ps)) {
1433                 usb_unlock_device(dev);
1434                 return -ENODEV;
1435         }
1436
1437         switch (cmd) {
1438         case USBDEVFS_CONTROL:
1439                 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
1440                 ret = proc_control(ps, p);
1441                 if (ret >= 0)
1442                         inode->i_mtime = CURRENT_TIME;
1443                 break;
1444
1445         case USBDEVFS_BULK:
1446                 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
1447                 ret = proc_bulk(ps, p);
1448                 if (ret >= 0)
1449                         inode->i_mtime = CURRENT_TIME;
1450                 break;
1451
1452         case USBDEVFS_RESETEP:
1453                 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
1454                 ret = proc_resetep(ps, p);
1455                 if (ret >= 0)
1456                         inode->i_mtime = CURRENT_TIME;
1457                 break;
1458
1459         case USBDEVFS_RESET:
1460                 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
1461                 ret = proc_resetdevice(ps);
1462                 break;
1463
1464         case USBDEVFS_CLEAR_HALT:
1465                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
1466                 ret = proc_clearhalt(ps, p);
1467                 if (ret >= 0)
1468                         inode->i_mtime = CURRENT_TIME;
1469                 break;
1470
1471         case USBDEVFS_GETDRIVER:
1472                 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
1473                 ret = proc_getdriver(ps, p);
1474                 break;
1475
1476         case USBDEVFS_CONNECTINFO:
1477                 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
1478                 ret = proc_connectinfo(ps, p);
1479                 break;
1480
1481         case USBDEVFS_SETINTERFACE:
1482                 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
1483                 ret = proc_setintf(ps, p);
1484                 break;
1485
1486         case USBDEVFS_SETCONFIGURATION:
1487                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
1488                 ret = proc_setconfig(ps, p);
1489                 break;
1490
1491         case USBDEVFS_SUBMITURB:
1492                 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
1493                 ret = proc_submiturb(ps, p);
1494                 if (ret >= 0)
1495                         inode->i_mtime = CURRENT_TIME;
1496                 break;
1497
1498 #ifdef CONFIG_COMPAT
1499
1500         case USBDEVFS_SUBMITURB32:
1501                 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
1502                 ret = proc_submiturb_compat(ps, p);
1503                 if (ret >= 0)
1504                         inode->i_mtime = CURRENT_TIME;
1505                 break;
1506
1507         case USBDEVFS_REAPURB32:
1508                 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
1509                 ret = proc_reapurb_compat(ps, p);
1510                 break;
1511
1512         case USBDEVFS_REAPURBNDELAY32:
1513                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
1514                 ret = proc_reapurbnonblock_compat(ps, p);
1515                 break;
1516
1517         case USBDEVFS_IOCTL32:
1518                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1519                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1520                 break;
1521 #endif
1522
1523         case USBDEVFS_DISCARDURB:
1524                 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
1525                 ret = proc_unlinkurb(ps, p);
1526                 break;
1527
1528         case USBDEVFS_REAPURB:
1529                 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
1530                 ret = proc_reapurb(ps, p);
1531                 break;
1532
1533         case USBDEVFS_REAPURBNDELAY:
1534                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
1535                 ret = proc_reapurbnonblock(ps, p);
1536                 break;
1537
1538         case USBDEVFS_DISCSIGNAL:
1539                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
1540                 ret = proc_disconnectsignal(ps, p);
1541                 break;
1542
1543         case USBDEVFS_CLAIMINTERFACE:
1544                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
1545                 ret = proc_claiminterface(ps, p);
1546                 break;
1547
1548         case USBDEVFS_RELEASEINTERFACE:
1549                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
1550                 ret = proc_releaseinterface(ps, p);
1551                 break;
1552
1553         case USBDEVFS_IOCTL:
1554                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1555                 ret = proc_ioctl_default(ps, p);
1556                 break;
1557         }
1558         usb_unlock_device(dev);
1559         if (ret >= 0)
1560                 inode->i_atime = CURRENT_TIME;
1561         return ret;
1562 }
1563
1564 /* No kernel lock - fine */
1565 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
1566 {
1567         struct dev_state *ps = file->private_data;
1568         unsigned int mask = 0;
1569
1570         poll_wait(file, &ps->wait, wait);
1571         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1572                 mask |= POLLOUT | POLLWRNORM;
1573         if (!connected(ps))
1574                 mask |= POLLERR | POLLHUP;
1575         return mask;
1576 }
1577
1578 const struct file_operations usbdev_file_operations = {
1579         .llseek =       usbdev_lseek,
1580         .read =         usbdev_read,
1581         .poll =         usbdev_poll,
1582         .ioctl =        usbdev_ioctl,
1583         .open =         usbdev_open,
1584         .release =      usbdev_release,
1585 };
1586
1587 #ifdef CONFIG_USB_DEVICE_CLASS
1588 static struct class *usb_classdev_class;
1589
1590 static int usb_classdev_add(struct usb_device *dev)
1591 {
1592         int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1593
1594         dev->usb_classdev = device_create(usb_classdev_class, &dev->dev,
1595                                 MKDEV(USB_DEVICE_MAJOR, minor),
1596                                 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1597         if (IS_ERR(dev->usb_classdev))
1598                 return PTR_ERR(dev->usb_classdev);
1599
1600         return 0;
1601 }
1602
1603 static void usb_classdev_remove(struct usb_device *dev)
1604 {
1605         device_unregister(dev->usb_classdev);
1606 }
1607
1608 static int usb_classdev_notify(struct notifier_block *self,
1609                                unsigned long action, void *dev)
1610 {
1611         switch (action) {
1612         case USB_DEVICE_ADD:
1613                 if (usb_classdev_add(dev))
1614                         return NOTIFY_BAD;
1615                 break;
1616         case USB_DEVICE_REMOVE:
1617                 usb_classdev_remove(dev);
1618                 break;
1619         }
1620         return NOTIFY_OK;
1621 }
1622
1623 static struct notifier_block usbdev_nb = {
1624         .notifier_call =        usb_classdev_notify,
1625 };
1626 #endif
1627
1628 static struct cdev usb_device_cdev = {
1629         .kobj   = {.name = "usb_device", },
1630         .owner  = THIS_MODULE,
1631 };
1632
1633 int __init usb_devio_init(void)
1634 {
1635         int retval;
1636
1637         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1638                         "usb_device");
1639         if (retval) {
1640                 err("unable to register minors for usb_device");
1641                 goto out;
1642         }
1643         cdev_init(&usb_device_cdev, &usbdev_file_operations);
1644         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1645         if (retval) {
1646                 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1647                 goto error_cdev;
1648         }
1649 #ifdef CONFIG_USB_DEVICE_CLASS
1650         usb_classdev_class = class_create(THIS_MODULE, "usb_device");
1651         if (IS_ERR(usb_classdev_class)) {
1652                 err("unable to register usb_device class");
1653                 retval = PTR_ERR(usb_classdev_class);
1654                 cdev_del(&usb_device_cdev);
1655                 usb_classdev_class = NULL;
1656                 goto out;
1657         }
1658
1659         usb_register_notify(&usbdev_nb);
1660 #endif
1661 out:
1662         return retval;
1663
1664 error_cdev:
1665         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1666         goto out;
1667 }
1668
1669 void usb_devio_cleanup(void)
1670 {
1671 #ifdef CONFIG_USB_DEVICE_CLASS
1672         usb_unregister_notify(&usbdev_nb);
1673         class_destroy(usb_classdev_class);
1674 #endif
1675         cdev_del(&usb_device_cdev);
1676         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1677 }