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;
  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,
 124                            loff_t *ppos)
 125 {
 126         struct dev_state *ps = file->private_data;
 127         struct usb_device *dev = ps->dev;
 128         ssize_t ret = 0;
 129         unsigned len;
 130         loff_t pos;
 131         int i;
 132
 133         pos = *ppos;
 134         usb_lock_device(dev);
 135         if (!connected(ps)) {
 136                 ret = -ENODEV;
 137                 goto err;
 138         } else if (pos < 0) {
 139                 ret = -EINVAL;
 140                 goto err;
 141         }
 142
 143         if (pos < sizeof(struct usb_device_descriptor)) {
 144                 /* 18 bytes - fits on the stack */
 145                 struct usb_device_descriptor temp_desc;
 146
 147                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 148                 le16_to_cpus(&temp_desc.bcdUSB);
 149                 le16_to_cpus(&temp_desc.idVendor);
 150                 le16_to_cpus(&temp_desc.idProduct);
 151                 le16_to_cpus(&temp_desc.bcdDevice);
 152
 153                 len = sizeof(struct usb_device_descriptor) - pos;
 154                 if (len > nbytes)
 155                         len = nbytes;
 156                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 157                         ret = -EFAULT;
 158                         goto err;
 159                 }
 160
 161                 *ppos += len;
 162                 buf += len;
 163                 nbytes -= len;
 164                 ret += len;
 165         }
 166
 167         pos = sizeof(struct usb_device_descriptor);
 168         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 169                 struct usb_config_descriptor *config =
 170                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 171                 unsigned int length = le16_to_cpu(config->wTotalLength);
 172
 173                 if (*ppos < pos + length) {
 174
 175                         /* The descriptor may claim to be longer than it
 176                          * really is.  Here is the actual allocated length. */
 177                         unsigned alloclen =
 178                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 179
 180                         len = length - (*ppos - pos);
 181                         if (len > nbytes)
 182                                 len = nbytes;
 183
 184                         /* Simply don't write (skip over) unallocated parts */
 185                         if (alloclen > (*ppos - pos)) {
 186                                 alloclen -= (*ppos - pos);
 187                                 if (copy_to_user(buf,
 188                                     dev->rawdescriptors[i] + (*ppos - pos),
 189                                     min(len, alloclen))) {
 190                                         ret = -EFAULT;
 191                                         goto err;
 192                                 }
 193                         }
 194
 195                         *ppos += len;
 196                         buf += len;
 197                         nbytes -= len;
 198                         ret += len;
 199                 }
 200
 201                 pos += length;
 202         }
 203
 204 err:
 205         usb_unlock_device(dev);
 206         return ret;
 207 }
 208
 209 /*
 210  * async list handling
 211  */
 212
 213 static struct async *alloc_async(unsigned int numisoframes)
 214 {
 215         struct async *as;
 216
 217         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 218         if (!as)
 219                 return NULL;
 220         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 221         if (!as->urb) {
 222                 kfree(as);
 223                 return NULL;
 224         }
 225         return as;
 226 }
 227
 228 static void free_async(struct async *as)
 229 {
 230         put_pid(as->pid);
 231         kfree(as->urb->transfer_buffer);
 232         kfree(as->urb->setup_packet);
 233         usb_free_urb(as->urb);
 234         kfree(as);
 235 }
 236
 237 static inline void async_newpending(struct async *as)
 238 {
 239         struct dev_state *ps = as->ps;
 240         unsigned long flags;
 241
 242         spin_lock_irqsave(&ps->lock, flags);
 243         list_add_tail(&as->asynclist, &ps->async_pending);
 244         spin_unlock_irqrestore(&ps->lock, flags);
 245 }
 246
 247 static inline void async_removepending(struct async *as)
 248 {
 249         struct dev_state *ps = as->ps;
 250         unsigned long flags;
 251
 252         spin_lock_irqsave(&ps->lock, flags);
 253         list_del_init(&as->asynclist);
 254         spin_unlock_irqrestore(&ps->lock, flags);
 255 }
 256
 257 static inline struct async *async_getcompleted(struct dev_state *ps)
 258 {
 259         unsigned long flags;
 260         struct async *as = NULL;
 261
 262         spin_lock_irqsave(&ps->lock, flags);
 263         if (!list_empty(&ps->async_completed)) {
 264                 as = list_entry(ps->async_completed.next, struct async,
 265                                 asynclist);
 266                 list_del_init(&as->asynclist);
 267         }
 268         spin_unlock_irqrestore(&ps->lock, flags);
 269         return as;
 270 }
 271
 272 static inline struct async *async_getpending(struct dev_state *ps,
 273                                              void __user *userurb)
 274 {
 275         unsigned long flags;
 276         struct async *as;
 277
 278         spin_lock_irqsave(&ps->lock, flags);
 279         list_for_each_entry(as, &ps->async_pending, asynclist)
 280                 if (as->userurb == userurb) {
 281                         list_del_init(&as->asynclist);
 282                         spin_unlock_irqrestore(&ps->lock, flags);
 283                         return as;
 284                 }
 285         spin_unlock_irqrestore(&ps->lock, flags);
 286         return NULL;
 287 }
 288
 289 static void snoop_urb(struct urb *urb, void __user *userurb)
 290 {
 291         int j;
 292         unsigned char *data = urb->transfer_buffer;
 293
 294         if (!usbfs_snoop)
 295                 return;
 296
 297         dev_info(&urb->dev->dev, "direction=%s\n",
 298                         usb_urb_dir_in(urb) ? "IN" : "OUT");
 299         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
 300         dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
 301                  urb->transfer_buffer_length);
 302         dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
 303         dev_info(&urb->dev->dev, "data: ");
 304         for (j = 0; j < urb->transfer_buffer_length; ++j)
 305                 printk("%02x ", data[j]);
 306         printk("\n");
 307 }
 308
 309 static void async_completed(struct urb *urb)
 310 {
 311         struct async *as = urb->context;
 312         struct dev_state *ps = as->ps;
 313         struct siginfo sinfo;
 314
 315         spin_lock(&ps->lock);
 316         list_move_tail(&as->asynclist, &ps->async_completed);
 317         spin_unlock(&ps->lock);
 318         as->status = urb->status;
 319         if (as->signr) {
 320                 sinfo.si_signo = as->signr;
 321                 sinfo.si_errno = as->status;
 322                 sinfo.si_code = SI_ASYNCIO;
 323                 sinfo.si_addr = as->userurb;
 324                 kill_pid_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
 325                                       as->euid, as->secid);
 326         }
 327         snoop(&urb->dev->dev, "urb complete\n");
 328         snoop_urb(urb, as->userurb);
 329         wake_up(&ps->wait);
 330 }
 331
 332 static void destroy_async(struct dev_state *ps, struct list_head *list)
 333 {
 334         struct async *as;
 335         unsigned long flags;
 336
 337         spin_lock_irqsave(&ps->lock, flags);
 338         while (!list_empty(list)) {
 339                 as = list_entry(list->next, struct async, asynclist);
 340                 list_del_init(&as->asynclist);
 341
 342                 /* drop the spinlock so the completion handler can run */
 343                 spin_unlock_irqrestore(&ps->lock, flags);
 344                 usb_kill_urb(as->urb);
 345                 spin_lock_irqsave(&ps->lock, flags);
 346         }
 347         spin_unlock_irqrestore(&ps->lock, flags);
 348         as = async_getcompleted(ps);
 349         while (as) {
 350                 free_async(as);
 351                 as = async_getcompleted(ps);
 352         }
 353 }
 354
 355 static void destroy_async_on_interface(struct dev_state *ps,
 356                                        unsigned int ifnum)
 357 {
 358         struct list_head *p, *q, hitlist;
 359         unsigned long flags;
 360
 361         INIT_LIST_HEAD(&hitlist);
 362         spin_lock_irqsave(&ps->lock, flags);
 363         list_for_each_safe(p, q, &ps->async_pending)
 364                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 365                         list_move_tail(p, &hitlist);
 366         spin_unlock_irqrestore(&ps->lock, flags);
 367         destroy_async(ps, &hitlist);
 368 }
 369
 370 static inline void destroy_all_async(struct dev_state *ps)
 371 {
 372         destroy_async(ps, &ps->async_pending);
 373 }
 374
 375 /*
 376  * interface claims are made only at the request of user level code,
 377  * which can also release them (explicitly or by closing files).
 378  * they're also undone when devices disconnect.
 379  */
 380
 381 static int driver_probe(struct usb_interface *intf,
 382                         const struct usb_device_id *id)
 383 {
 384         return -ENODEV;
 385 }
 386
 387 static void driver_disconnect(struct usb_interface *intf)
 388 {
 389         struct dev_state *ps = usb_get_intfdata(intf);
 390         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 391
 392         if (!ps)
 393                 return;
 394
 395         /* NOTE:  this relies on usbcore having canceled and completed
 396          * all pending I/O requests; 2.6 does that.
 397          */
 398
 399         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 400                 clear_bit(ifnum, &ps->ifclaimed);
 401         else
 402                 warn("interface number %u out of range", ifnum);
 403
 404         usb_set_intfdata(intf, NULL);
 405
 406         /* force async requests to complete */
 407         destroy_async_on_interface(ps, ifnum);
 408 }
 409
 410 /* The following routines are merely placeholders.  There is no way
 411  * to inform a user task about suspend or resumes.
 412  */
 413 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 414 {
 415         return 0;
 416 }
 417
 418 static int driver_resume(struct usb_interface *intf)
 419 {
 420         return 0;
 421 }
 422
 423 struct usb_driver usbfs_driver = {
 424         .name =         "usbfs",
 425         .probe =        driver_probe,
 426         .disconnect =   driver_disconnect,
 427         .suspend =      driver_suspend,
 428         .resume =       driver_resume,
 429 };
 430
 431 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 432 {
 433         struct usb_device *dev = ps->dev;
 434         struct usb_interface *intf;
 435         int err;
 436
 437         if (ifnum >= 8*sizeof(ps->ifclaimed))
 438                 return -EINVAL;
 439         /* already claimed */
 440         if (test_bit(ifnum, &ps->ifclaimed))
 441                 return 0;
 442
 443         intf = usb_ifnum_to_if(dev, ifnum);
 444         if (!intf)
 445                 err = -ENOENT;
 446         else
 447                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 448         if (err == 0)
 449                 set_bit(ifnum, &ps->ifclaimed);
 450         return err;
 451 }
 452
 453 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 454 {
 455         struct usb_device *dev;
 456         struct usb_interface *intf;
 457         int err;
 458
 459         err = -EINVAL;
 460         if (ifnum >= 8*sizeof(ps->ifclaimed))
 461                 return err;
 462         dev = ps->dev;
 463         intf = usb_ifnum_to_if(dev, ifnum);
 464         if (!intf)
 465                 err = -ENOENT;
 466         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 467                 usb_driver_release_interface(&usbfs_driver, intf);
 468                 err = 0;
 469         }
 470         return err;
 471 }
 472
 473 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 474 {
 475         if (ps->dev->state != USB_STATE_CONFIGURED)
 476                 return -EHOSTUNREACH;
 477         if (ifnum >= 8*sizeof(ps->ifclaimed))
 478                 return -EINVAL;
 479         if (test_bit(ifnum, &ps->ifclaimed))
 480                 return 0;
 481         /* if not yet claimed, claim it for the driver */
 482         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 483                  "interface %u before use\n", task_pid_nr(current),
 484                  current->comm, ifnum);
 485         return claimintf(ps, ifnum);
 486 }
 487
 488 static int findintfep(struct usb_device *dev, unsigned int ep)
 489 {
 490         unsigned int i, j, e;
 491         struct usb_interface *intf;
 492         struct usb_host_interface *alts;
 493         struct usb_endpoint_descriptor *endpt;
 494
 495         if (ep & ~(USB_DIR_IN|0xf))
 496                 return -EINVAL;
 497         if (!dev->actconfig)
 498                 return -ESRCH;
 499         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 500                 intf = dev->actconfig->interface[i];
 501                 for (j = 0; j < intf->num_altsetting; j++) {
 502                         alts = &intf->altsetting[j];
 503                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 504                                 endpt = &alts->endpoint[e].desc;
 505                                 if (endpt->bEndpointAddress == ep)
 506                                         return alts->desc.bInterfaceNumber;
 507                         }
 508                 }
 509         }
 510         return -ENOENT;
 511 }
 512
 513 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
 514                            unsigned int index)
 515 {
 516         int ret = 0;
 517
 518         if (ps->dev->state != USB_STATE_ADDRESS
 519          && ps->dev->state != USB_STATE_CONFIGURED)
 520                 return -EHOSTUNREACH;
 521         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 522                 return 0;
 523
 524         index &= 0xff;
 525         switch (requesttype & USB_RECIP_MASK) {
 526         case USB_RECIP_ENDPOINT:
 527                 ret = findintfep(ps->dev, index);
 528                 if (ret >= 0)
 529                         ret = checkintf(ps, ret);
 530                 break;
 531
 532         case USB_RECIP_INTERFACE:
 533                 ret = checkintf(ps, index);
 534                 break;
 535         }
 536         return ret;
 537 }
 538
 539 static int __match_minor(struct device *dev, void *data)
 540 {
 541         int minor = *((int *)data);
 542
 543         if (dev->devt == MKDEV(USB_DEVICE_MAJOR, minor))
 544                 return 1;
 545         return 0;
 546 }
 547
 548 static struct usb_device *usbdev_lookup_by_minor(int minor)
 549 {
 550         struct device *dev;
 551
 552         dev = bus_find_device(&usb_bus_type, NULL, &minor, __match_minor);
 553         if (!dev)
 554                 return NULL;
 555         put_device(dev);
 556         return container_of(dev, struct usb_device, dev);
 557 }
 558
 559 /*
 560  * file operations
 561  */
 562 static int usbdev_open(struct inode *inode, struct file *file)
 563 {
 564         struct usb_device *dev = NULL;
 565         struct dev_state *ps;
 566         int ret;
 567
 568         lock_kernel();
 569         /* Protect against simultaneous removal or release */
 570         mutex_lock(&usbfs_mutex);
 571
 572         ret = -ENOMEM;
 573         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
 574         if (!ps)
 575                 goto out;
 576
 577         ret = -ENOENT;
 578         /* usbdev device-node */
 579         if (imajor(inode) == USB_DEVICE_MAJOR)
 580                 dev = usbdev_lookup_by_minor(iminor(inode));
 581 #ifdef CONFIG_USB_DEVICEFS
 582         /* procfs file */
 583         if (!dev)
 584                 dev = inode->i_private;
 585 #endif
 586         if (!dev)
 587                 goto out;
 588         ret = usb_autoresume_device(dev);
 589         if (ret)
 590                 goto out;
 591
 592         usb_get_dev(dev);
 593         ret = 0;
 594         ps->dev = dev;
 595         ps->file = file;
 596         spin_lock_init(&ps->lock);
 597         INIT_LIST_HEAD(&ps->list);
 598         INIT_LIST_HEAD(&ps->async_pending);
 599         INIT_LIST_HEAD(&ps->async_completed);
 600         init_waitqueue_head(&ps->wait);
 601         ps->discsignr = 0;
 602         ps->disc_pid = get_pid(task_pid(current));
 603         ps->disc_uid = current->uid;
 604         ps->disc_euid = current->euid;
 605         ps->disccontext = NULL;
 606         ps->ifclaimed = 0;
 607         security_task_getsecid(current, &ps->secid);
 608         smp_wmb();
 609         list_add_tail(&ps->list, &dev->filelist);
 610         file->private_data = ps;
 611  out:
 612         if (ret)
 613                 kfree(ps);
 614         mutex_unlock(&usbfs_mutex);
 615         unlock_kernel();
 616         return ret;
 617 }
 618
 619 static int usbdev_release(struct inode *inode, struct file *file)
 620 {
 621         struct dev_state *ps = file->private_data;
 622         struct usb_device *dev = ps->dev;
 623         unsigned int ifnum;
 624
 625         usb_lock_device(dev);
 626
 627         /* Protect against simultaneous open */
 628         mutex_lock(&usbfs_mutex);
 629         list_del_init(&ps->list);
 630         mutex_unlock(&usbfs_mutex);
 631
 632         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 633                         ifnum++) {
 634                 if (test_bit(ifnum, &ps->ifclaimed))
 635                         releaseintf(ps, ifnum);
 636         }
 637         destroy_all_async(ps);
 638         usb_autosuspend_device(dev);
 639         usb_unlock_device(dev);
 640         usb_put_dev(dev);
 641         put_pid(ps->disc_pid);
 642         kfree(ps);
 643         return 0;
 644 }
 645
 646 static int proc_control(struct dev_state *ps, void __user *arg)
 647 {
 648         struct usb_device *dev = ps->dev;
 649         struct usbdevfs_ctrltransfer ctrl;
 650         unsigned int tmo;
 651         unsigned char *tbuf;
 652         unsigned wLength;
 653         int i, j, ret;
 654
 655         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 656                 return -EFAULT;
 657         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
 658         if (ret)
 659                 return ret;
 660         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
 661         if (wLength > PAGE_SIZE)
 662                 return -EINVAL;
 663         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
 664         if (!tbuf)
 665                 return -ENOMEM;
 666         tmo = ctrl.timeout;
 667         if (ctrl.bRequestType & 0x80) {
 668                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
 669                                                ctrl.wLength)) {
 670                         free_page((unsigned long)tbuf);
 671                         return -EINVAL;
 672                 }
 673                 snoop(&dev->dev, "control read: bRequest=%02x "
 674                                 "bRrequestType=%02x wValue=%04x "
 675                                 "wIndex=%04x wLength=%04x\n",
 676                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 677                                 ctrl.wIndex, ctrl.wLength);
 678
 679                 usb_unlock_device(dev);
 680                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest,
 681                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 682                                     tbuf, ctrl.wLength, tmo);
 683                 usb_lock_device(dev);
 684                 if ((i > 0) && ctrl.wLength) {
 685                         if (usbfs_snoop) {
 686                                 dev_info(&dev->dev, "control read: data ");
 687                                 for (j = 0; j < i; ++j)
 688                                         printk("%02x ", (u8)(tbuf)[j]);
 689                                 printk("\n");
 690                         }
 691                         if (copy_to_user(ctrl.data, tbuf, i)) {
 692                                 free_page((unsigned long)tbuf);
 693                                 return -EFAULT;
 694                         }
 695                 }
 696         } else {
 697                 if (ctrl.wLength) {
 698                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 699                                 free_page((unsigned long)tbuf);
 700                                 return -EFAULT;
 701                         }
 702                 }
 703                 snoop(&dev->dev, "control write: bRequest=%02x "
 704                                 "bRrequestType=%02x wValue=%04x "
 705                                 "wIndex=%04x wLength=%04x\n",
 706                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 707                                 ctrl.wIndex, ctrl.wLength);
 708                 if (usbfs_snoop) {
 709                         dev_info(&dev->dev, "control write: data: ");
 710                         for (j = 0; j < ctrl.wLength; ++j)
 711                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 712                         printk("\n");
 713                 }
 714                 usb_unlock_device(dev);
 715                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
 716                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 717                                     tbuf, ctrl.wLength, tmo);
 718                 usb_lock_device(dev);
 719         }
 720         free_page((unsigned long)tbuf);
 721         if (i < 0 && i != -EPIPE) {
 722                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 723                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 724                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 725                            ctrl.wLength, i);
 726         }
 727         return i;
 728 }
 729
 730 static int proc_bulk(struct dev_state *ps, void __user *arg)
 731 {
 732         struct usb_device *dev = ps->dev;
 733         struct usbdevfs_bulktransfer bulk;
 734         unsigned int tmo, len1, pipe;
 735         int len2;
 736         unsigned char *tbuf;
 737         int i, j, ret;
 738
 739         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 740                 return -EFAULT;
 741         ret = findintfep(ps->dev, bulk.ep);
 742         if (ret < 0)
 743                 return ret;
 744         ret = checkintf(ps, ret);
 745         if (ret)
 746                 return ret;
 747         if (bulk.ep & USB_DIR_IN)
 748                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 749         else
 750                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 751         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 752                 return -EINVAL;
 753         len1 = bulk.len;
 754         if (len1 > MAX_USBFS_BUFFER_SIZE)
 755                 return -EINVAL;
 756         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 757                 return -ENOMEM;
 758         tmo = bulk.timeout;
 759         if (bulk.ep & 0x80) {
 760                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 761                         kfree(tbuf);
 762                         return -EINVAL;
 763                 }
 764                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
 765                         bulk.len, bulk.timeout);
 766                 usb_unlock_device(dev);
 767                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 768                 usb_lock_device(dev);
 769                 if (!i && len2) {
 770                         if (usbfs_snoop) {
 771                                 dev_info(&dev->dev, "bulk read: data ");
 772                                 for (j = 0; j < len2; ++j)
 773                                         printk("%02x ", (u8)(tbuf)[j]);
 774                                 printk("\n");
 775                         }
 776                         if (copy_to_user(bulk.data, tbuf, len2)) {
 777                                 kfree(tbuf);
 778                                 return -EFAULT;
 779                         }
 780                 }
 781         } else {
 782                 if (len1) {
 783                         if (copy_from_user(tbuf, bulk.data, len1)) {
 784                                 kfree(tbuf);
 785                                 return -EFAULT;
 786                         }
 787                 }
 788                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
 789                         bulk.len, bulk.timeout);
 790                 if (usbfs_snoop) {
 791                         dev_info(&dev->dev, "bulk write: data: ");
 792                         for (j = 0; j < len1; ++j)
 793                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 794                         printk("\n");
 795                 }
 796                 usb_unlock_device(dev);
 797                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 798                 usb_lock_device(dev);
 799         }
 800         kfree(tbuf);
 801         if (i < 0)
 802                 return i;
 803         return len2;
 804 }
 805
 806 static int proc_resetep(struct dev_state *ps, void __user *arg)
 807 {
 808         unsigned int ep;
 809         int ret;
 810
 811         if (get_user(ep, (unsigned int __user *)arg))
 812                 return -EFAULT;
 813         ret = findintfep(ps->dev, ep);
 814         if (ret < 0)
 815                 return ret;
 816         ret = checkintf(ps, ret);
 817         if (ret)
 818                 return ret;
 819         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
 820         return 0;
 821 }
 822
 823 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 824 {
 825         unsigned int ep;
 826         int pipe;
 827         int ret;
 828
 829         if (get_user(ep, (unsigned int __user *)arg))
 830                 return -EFAULT;
 831         ret = findintfep(ps->dev, ep);
 832         if (ret < 0)
 833                 return ret;
 834         ret = checkintf(ps, ret);
 835         if (ret)
 836                 return ret;
 837         if (ep & USB_DIR_IN)
 838                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 839         else
 840                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 841
 842         return usb_clear_halt(ps->dev, pipe);
 843 }
 844
 845 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 846 {
 847         struct usbdevfs_getdriver gd;
 848         struct usb_interface *intf;
 849         int ret;
 850
 851         if (copy_from_user(&gd, arg, sizeof(gd)))
 852                 return -EFAULT;
 853         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 854         if (!intf || !intf->dev.driver)
 855                 ret = -ENODATA;
 856         else {
 857                 strncpy(gd.driver, intf->dev.driver->name,
 858                                 sizeof(gd.driver));
 859                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 860         }
 861         return ret;
 862 }
 863
 864 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 865 {
 866         struct usbdevfs_connectinfo ci;
 867
 868         ci.devnum = ps->dev->devnum;
 869         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 870         if (copy_to_user(arg, &ci, sizeof(ci)))
 871                 return -EFAULT;
 872         return 0;
 873 }
 874
 875 static int proc_resetdevice(struct dev_state *ps)
 876 {
 877         return usb_reset_composite_device(ps->dev, NULL);
 878 }
 879
 880 static int proc_setintf(struct dev_state *ps, void __user *arg)
 881 {
 882         struct usbdevfs_setinterface setintf;
 883         int ret;
 884
 885         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 886                 return -EFAULT;
 887         if ((ret = checkintf(ps, setintf.interface)))
 888                 return ret;
 889         return usb_set_interface(ps->dev, setintf.interface,
 890                         setintf.altsetting);
 891 }
 892
 893 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 894 {
 895         int u;
 896         int status = 0;
 897         struct usb_host_config *actconfig;
 898
 899         if (get_user(u, (int __user *)arg))
 900                 return -EFAULT;
 901
 902         actconfig = ps->dev->actconfig;
 903
 904         /* Don't touch the device if any interfaces are claimed.
 905          * It could interfere with other drivers' operations, and if
 906          * an interface is claimed by usbfs it could easily deadlock.
 907          */
 908         if (actconfig) {
 909                 int i;
 910
 911                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 912                         if (usb_interface_claimed(actconfig->interface[i])) {
 913                                 dev_warn(&ps->dev->dev,
 914                                         "usbfs: interface %d claimed by %s "
 915                                         "while '%s' sets config #%d\n",
 916                                         actconfig->interface[i]
 917                                                 ->cur_altsetting
 918                                                 ->desc.bInterfaceNumber,
 919                                         actconfig->interface[i]
 920                                                 ->dev.driver->name,
 921                                         current->comm, u);
 922                                 status = -EBUSY;
 923                                 break;
 924                         }
 925                 }
 926         }
 927
 928         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 929          * so avoid usb_set_configuration()'s kick to sysfs
 930          */
 931         if (status == 0) {
 932                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 933                         status = usb_reset_configuration(ps->dev);
 934                 else
 935                         status = usb_set_configuration(ps->dev, u);
 936         }
 937
 938         return status;
 939 }
 940
 941 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 942                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
 943                         void __user *arg)
 944 {
 945         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 946         struct usb_host_endpoint *ep;
 947         struct async *as;
 948         struct usb_ctrlrequest *dr = NULL;
 949         unsigned int u, totlen, isofrmlen;
 950         int ret, ifnum = -1;
 951         int is_in;
 952
 953         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
 954                                 USBDEVFS_URB_SHORT_NOT_OK |
 955                                 USBDEVFS_URB_NO_FSBR |
 956                                 USBDEVFS_URB_ZERO_PACKET |
 957                                 USBDEVFS_URB_NO_INTERRUPT))
 958                 return -EINVAL;
 959         if (!uurb->buffer)
 960                 return -EINVAL;
 961         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN ||
 962                                  uurb->signr > SIGRTMAX))
 963                 return -EINVAL;
 964         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
 965             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
 966                 ifnum = findintfep(ps->dev, uurb->endpoint);
 967                 if (ifnum < 0)
 968                         return ifnum;
 969                 ret = checkintf(ps, ifnum);
 970                 if (ret)
 971                         return ret;
 972         }
 973         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
 974                 is_in = 1;
 975                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 976         } else {
 977                 is_in = 0;
 978                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 979         }
 980         if (!ep)
 981                 return -ENOENT;
 982         switch(uurb->type) {
 983         case USBDEVFS_URB_TYPE_CONTROL:
 984                 if (!usb_endpoint_xfer_control(&ep->desc))
 985                         return -EINVAL;
 986                 /* min 8 byte setup packet,
 987                  * max 8 byte setup plus an arbitrary data stage */
 988                 if (uurb->buffer_length < 8 ||
 989                     uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
 990                         return -EINVAL;
 991                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
 992                 if (!dr)
 993                         return -ENOMEM;
 994                 if (copy_from_user(dr, uurb->buffer, 8)) {
 995                         kfree(dr);
 996                         return -EFAULT;
 997                 }
 998                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
 999                         kfree(dr);
1000                         return -EINVAL;
1001                 }
1002                 ret = check_ctrlrecip(ps, dr->bRequestType,
1003                                       le16_to_cpup(&dr->wIndex));
1004                 if (ret) {
1005                         kfree(dr);
1006                         return ret;
1007                 }
1008                 uurb->number_of_packets = 0;
1009                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1010                 uurb->buffer += 8;
1011                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1012                         is_in = 1;
1013                         uurb->endpoint |= USB_DIR_IN;
1014                 } else {
1015                         is_in = 0;
1016                         uurb->endpoint &= ~USB_DIR_IN;
1017                 }
1018                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1019                                 uurb->buffer, uurb->buffer_length)) {
1020                         kfree(dr);
1021                         return -EFAULT;
1022                 }
1023                 snoop(&ps->dev->dev, "control urb: bRequest=%02x "
1024                         "bRrequestType=%02x wValue=%04x "
1025                         "wIndex=%04x wLength=%04x\n",
1026                         dr->bRequest, dr->bRequestType,
1027                         __le16_to_cpup(&dr->wValue),
1028                         __le16_to_cpup(&dr->wIndex),
1029                         __le16_to_cpup(&dr->wLength));
1030                 break;
1031
1032         case USBDEVFS_URB_TYPE_BULK:
1033                 switch (usb_endpoint_type(&ep->desc)) {
1034                 case USB_ENDPOINT_XFER_CONTROL:
1035                 case USB_ENDPOINT_XFER_ISOC:
1036                         return -EINVAL;
1037                 /* allow single-shot interrupt transfers, at bogus rates */
1038                 }
1039                 uurb->number_of_packets = 0;
1040                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1041                         return -EINVAL;
1042                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1043                                 uurb->buffer, uurb->buffer_length))
1044                         return -EFAULT;
1045                 snoop(&ps->dev->dev, "bulk urb\n");
1046                 break;
1047
1048         case USBDEVFS_URB_TYPE_ISO:
1049                 /* arbitrary limit */
1050                 if (uurb->number_of_packets < 1 ||
1051                     uurb->number_of_packets > 128)
1052                         return -EINVAL;
1053                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1054                         return -EINVAL;
1055                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1056                                    uurb->number_of_packets;
1057                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1058                         return -ENOMEM;
1059                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1060                         kfree(isopkt);
1061                         return -EFAULT;
1062                 }
1063                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1064                         /* arbitrary limit,
1065                          * sufficient for USB 2.0 high-bandwidth iso */
1066                         if (isopkt[u].length > 8192) {
1067                                 kfree(isopkt);
1068                                 return -EINVAL;
1069                         }
1070                         totlen += isopkt[u].length;
1071                 }
1072                 if (totlen > 32768) {
1073                         kfree(isopkt);
1074                         return -EINVAL;
1075                 }
1076                 uurb->buffer_length = totlen;
1077                 snoop(&ps->dev->dev, "iso urb\n");
1078                 break;
1079
1080         case USBDEVFS_URB_TYPE_INTERRUPT:
1081                 uurb->number_of_packets = 0;
1082                 if (!usb_endpoint_xfer_int(&ep->desc))
1083                         return -EINVAL;
1084                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1085                         return -EINVAL;
1086                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1087                                 uurb->buffer, uurb->buffer_length))
1088                         return -EFAULT;
1089                 snoop(&ps->dev->dev, "interrupt urb\n");
1090                 break;
1091
1092         default:
1093                 return -EINVAL;
1094         }
1095         as = alloc_async(uurb->number_of_packets);
1096         if (!as) {
1097                 kfree(isopkt);
1098                 kfree(dr);
1099                 return -ENOMEM;
1100         }
1101         as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL);
1102         if (!as->urb->transfer_buffer) {
1103                 kfree(isopkt);
1104                 kfree(dr);
1105                 free_async(as);
1106                 return -ENOMEM;
1107         }
1108         as->urb->dev = ps->dev;
1109         as->urb->pipe = (uurb->type << 30) |
1110                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1111                         (uurb->endpoint & USB_DIR_IN);
1112
1113         /* This tedious sequence is necessary because the URB_* flags
1114          * are internal to the kernel and subject to change, whereas
1115          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1116          */
1117         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1118         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1119                 u |= URB_ISO_ASAP;
1120         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1121                 u |= URB_SHORT_NOT_OK;
1122         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1123                 u |= URB_NO_FSBR;
1124         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1125                 u |= URB_ZERO_PACKET;
1126         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1127                 u |= URB_NO_INTERRUPT;
1128         as->urb->transfer_flags = u;
1129
1130         as->urb->transfer_buffer_length = uurb->buffer_length;
1131         as->urb->setup_packet = (unsigned char *)dr;
1132         as->urb->start_frame = uurb->start_frame;
1133         as->urb->number_of_packets = uurb->number_of_packets;
1134         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1135                         ps->dev->speed == USB_SPEED_HIGH)
1136                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1137         else
1138                 as->urb->interval = ep->desc.bInterval;
1139         as->urb->context = as;
1140         as->urb->complete = async_completed;
1141         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1142                 as->urb->iso_frame_desc[u].offset = totlen;
1143                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1144                 totlen += isopkt[u].length;
1145         }
1146         kfree(isopkt);
1147         as->ps = ps;
1148         as->userurb = arg;
1149         if (uurb->endpoint & USB_DIR_IN)
1150                 as->userbuffer = uurb->buffer;
1151         else
1152                 as->userbuffer = NULL;
1153         as->signr = uurb->signr;
1154         as->ifnum = ifnum;
1155         as->pid = get_pid(task_pid(current));
1156         as->uid = current->uid;
1157         as->euid = current->euid;
1158         security_task_getsecid(current, &as->secid);
1159         if (!is_in) {
1160                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1161                                 as->urb->transfer_buffer_length)) {
1162                         free_async(as);
1163                         return -EFAULT;
1164                 }
1165         }
1166         snoop_urb(as->urb, as->userurb);
1167         async_newpending(as);
1168         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1169                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1170                            "usbfs: usb_submit_urb returned %d\n", ret);
1171                 async_removepending(as);
1172                 free_async(as);
1173                 return ret;
1174         }
1175         return 0;
1176 }
1177
1178 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1179 {
1180         struct usbdevfs_urb uurb;
1181
1182         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1183                 return -EFAULT;
1184
1185         return proc_do_submiturb(ps, &uurb,
1186                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1187                         arg);
1188 }
1189
1190 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1191 {
1192         struct async *as;
1193
1194         as = async_getpending(ps, arg);
1195         if (!as)
1196                 return -EINVAL;
1197         usb_kill_urb(as->urb);
1198         return 0;
1199 }
1200
1201 static int processcompl(struct async *as, void __user * __user *arg)
1202 {
1203         struct urb *urb = as->urb;
1204         struct usbdevfs_urb __user *userurb = as->userurb;
1205         void __user *addr = as->userurb;
1206         unsigned int i;
1207
1208         if (as->userbuffer)
1209                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1210                                  urb->transfer_buffer_length))
1211                         return -EFAULT;
1212         if (put_user(as->status, &userurb->status))
1213                 return -EFAULT;
1214         if (put_user(urb->actual_length, &userurb->actual_length))
1215                 return -EFAULT;
1216         if (put_user(urb->error_count, &userurb->error_count))
1217                 return -EFAULT;
1218
1219         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1220                 for (i = 0; i < urb->number_of_packets; i++) {
1221                         if (put_user(urb->iso_frame_desc[i].actual_length,
1222                                      &userurb->iso_frame_desc[i].actual_length))
1223                                 return -EFAULT;
1224                         if (put_user(urb->iso_frame_desc[i].status,
1225                                      &userurb->iso_frame_desc[i].status))
1226                                 return -EFAULT;
1227                 }
1228         }
1229
1230         free_async(as);
1231
1232         if (put_user(addr, (void __user * __user *)arg))
1233                 return -EFAULT;
1234         return 0;
1235 }
1236
1237 static struct async *reap_as(struct dev_state *ps)
1238 {
1239         DECLARE_WAITQUEUE(wait, current);
1240         struct async *as = NULL;
1241         struct usb_device *dev = ps->dev;
1242
1243         add_wait_queue(&ps->wait, &wait);
1244         for (;;) {
1245                 __set_current_state(TASK_INTERRUPTIBLE);
1246                 as = async_getcompleted(ps);
1247                 if (as)
1248                         break;
1249                 if (signal_pending(current))
1250                         break;
1251                 usb_unlock_device(dev);
1252                 schedule();
1253                 usb_lock_device(dev);
1254         }
1255         remove_wait_queue(&ps->wait, &wait);
1256         set_current_state(TASK_RUNNING);
1257         return as;
1258 }
1259
1260 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1261 {
1262         struct async *as = reap_as(ps);
1263         if (as)
1264                 return processcompl(as, (void __user * __user *)arg);
1265         if (signal_pending(current))
1266                 return -EINTR;
1267         return -EIO;
1268 }
1269
1270 static int proc_reapurbnonblock(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(as, (void __user * __user *)arg);
1277 }
1278
1279 #ifdef CONFIG_COMPAT
1280
1281 static int get_urb32(struct usbdevfs_urb *kurb,
1282                      struct usbdevfs_urb32 __user *uurb)
1283 {
1284         __u32  uptr;
1285         if (get_user(kurb->type, &uurb->type) ||
1286             __get_user(kurb->endpoint, &uurb->endpoint) ||
1287             __get_user(kurb->status, &uurb->status) ||
1288             __get_user(kurb->flags, &uurb->flags) ||
1289             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1290             __get_user(kurb->actual_length, &uurb->actual_length) ||
1291             __get_user(kurb->start_frame, &uurb->start_frame) ||
1292             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1293             __get_user(kurb->error_count, &uurb->error_count) ||
1294             __get_user(kurb->signr, &uurb->signr))
1295                 return -EFAULT;
1296
1297         if (__get_user(uptr, &uurb->buffer))
1298                 return -EFAULT;
1299         kurb->buffer = compat_ptr(uptr);
1300         if (__get_user(uptr, &uurb->buffer))
1301                 return -EFAULT;
1302         kurb->usercontext = compat_ptr(uptr);
1303
1304         return 0;
1305 }
1306
1307 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1308 {
1309         struct usbdevfs_urb uurb;
1310
1311         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1312                 return -EFAULT;
1313
1314         return proc_do_submiturb(ps, &uurb,
1315                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1316                         arg);
1317 }
1318
1319 static int processcompl_compat(struct async *as, void __user * __user *arg)
1320 {
1321         struct urb *urb = as->urb;
1322         struct usbdevfs_urb32 __user *userurb = as->userurb;
1323         void __user *addr = as->userurb;
1324         unsigned int i;
1325
1326         if (as->userbuffer)
1327                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1328                                  urb->transfer_buffer_length))
1329                         return -EFAULT;
1330         if (put_user(as->status, &userurb->status))
1331                 return -EFAULT;
1332         if (put_user(urb->actual_length, &userurb->actual_length))
1333                 return -EFAULT;
1334         if (put_user(urb->error_count, &userurb->error_count))
1335                 return -EFAULT;
1336
1337         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1338                 for (i = 0; i < urb->number_of_packets; i++) {
1339                         if (put_user(urb->iso_frame_desc[i].actual_length,
1340                                      &userurb->iso_frame_desc[i].actual_length))
1341                                 return -EFAULT;
1342                         if (put_user(urb->iso_frame_desc[i].status,
1343                                      &userurb->iso_frame_desc[i].status))
1344                                 return -EFAULT;
1345                 }
1346         }
1347
1348         free_async(as);
1349         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1350                 return -EFAULT;
1351         return 0;
1352 }
1353
1354 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1355 {
1356         struct async *as = reap_as(ps);
1357         if (as)
1358                 return processcompl_compat(as, (void __user * __user *)arg);
1359         if (signal_pending(current))
1360                 return -EINTR;
1361         return -EIO;
1362 }
1363
1364 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1365 {
1366         struct async *as;
1367
1368         if (!(as = async_getcompleted(ps)))
1369                 return -EAGAIN;
1370         return processcompl_compat(as, (void __user * __user *)arg);
1371 }
1372
1373 #endif
1374
1375 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1376 {
1377         struct usbdevfs_disconnectsignal ds;
1378
1379         if (copy_from_user(&ds, arg, sizeof(ds)))
1380                 return -EFAULT;
1381         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1382                 return -EINVAL;
1383         ps->discsignr = ds.signr;
1384         ps->disccontext = ds.context;
1385         return 0;
1386 }
1387
1388 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1389 {
1390         unsigned int ifnum;
1391
1392         if (get_user(ifnum, (unsigned int __user *)arg))
1393                 return -EFAULT;
1394         return claimintf(ps, ifnum);
1395 }
1396
1397 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1398 {
1399         unsigned int ifnum;
1400         int ret;
1401
1402         if (get_user(ifnum, (unsigned int __user *)arg))
1403                 return -EFAULT;
1404         if ((ret = releaseintf(ps, ifnum)) < 0)
1405                 return ret;
1406         destroy_async_on_interface (ps, ifnum);
1407         return 0;
1408 }
1409
1410 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1411 {
1412         int                     size;
1413         void                    *buf = NULL;
1414         int                     retval = 0;
1415         struct usb_interface    *intf = NULL;
1416         struct usb_driver       *driver = NULL;
1417
1418         /* alloc buffer */
1419         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1420                 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1421                         return -ENOMEM;
1422                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1423                         if (copy_from_user(buf, ctl->data, size)) {
1424                                 kfree(buf);
1425                                 return -EFAULT;
1426                         }
1427                 } else {
1428                         memset(buf, 0, size);
1429                 }
1430         }
1431
1432         if (!connected(ps)) {
1433                 kfree(buf);
1434                 return -ENODEV;
1435         }
1436
1437         if (ps->dev->state != USB_STATE_CONFIGURED)
1438                 retval = -EHOSTUNREACH;
1439         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1440                 retval = -EINVAL;
1441         else switch (ctl->ioctl_code) {
1442
1443         /* disconnect kernel driver from interface */
1444         case USBDEVFS_DISCONNECT:
1445                 if (intf->dev.driver) {
1446                         driver = to_usb_driver(intf->dev.driver);
1447                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1448                         usb_driver_release_interface(driver, intf);
1449                 } else
1450                         retval = -ENODATA;
1451                 break;
1452
1453         /* let kernel drivers try to (re)bind to the interface */
1454         case USBDEVFS_CONNECT:
1455                 if (!intf->dev.driver)
1456                         retval = device_attach(&intf->dev);
1457                 else
1458                         retval = -EBUSY;
1459                 break;
1460
1461         /* talk directly to the interface's driver */
1462         default:
1463                 if (intf->dev.driver)
1464                         driver = to_usb_driver(intf->dev.driver);
1465                 if (driver == NULL || driver->ioctl == NULL) {
1466                         retval = -ENOTTY;
1467                 } else {
1468                         retval = driver->ioctl(intf, ctl->ioctl_code, buf);
1469                         if (retval == -ENOIOCTLCMD)
1470                                 retval = -ENOTTY;
1471                 }
1472         }
1473
1474         /* cleanup and return */
1475         if (retval >= 0
1476                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1477                         && size > 0
1478                         && copy_to_user(ctl->data, buf, size) != 0)
1479                 retval = -EFAULT;
1480
1481         kfree(buf);
1482         return retval;
1483 }
1484
1485 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1486 {
1487         struct usbdevfs_ioctl   ctrl;
1488
1489         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1490                 return -EFAULT;
1491         return proc_ioctl(ps, &ctrl);
1492 }
1493
1494 #ifdef CONFIG_COMPAT
1495 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1496 {
1497         struct usbdevfs_ioctl32 __user *uioc;
1498         struct usbdevfs_ioctl ctrl;
1499         u32 udata;
1500
1501         uioc = compat_ptr((long)arg);
1502         if (get_user(ctrl.ifno, &uioc->ifno) ||
1503             get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1504             __get_user(udata, &uioc->data))
1505                 return -EFAULT;
1506         ctrl.data = compat_ptr(udata);
1507
1508         return proc_ioctl(ps, &ctrl);
1509 }
1510 #endif
1511
1512 /*
1513  * NOTE:  All requests here that have interface numbers as parameters
1514  * are assuming that somehow the configuration has been prevented from
1515  * changing.  But there's no mechanism to ensure that...
1516  */
1517 static int usbdev_ioctl(struct inode *inode, struct file *file,
1518                         unsigned int cmd, unsigned long arg)
1519 {
1520         struct dev_state *ps = file->private_data;
1521         struct usb_device *dev = ps->dev;
1522         void __user *p = (void __user *)arg;
1523         int ret = -ENOTTY;
1524
1525         if (!(file->f_mode & FMODE_WRITE))
1526                 return -EPERM;
1527         usb_lock_device(dev);
1528         if (!connected(ps)) {
1529                 usb_unlock_device(dev);
1530                 return -ENODEV;
1531         }
1532
1533         switch (cmd) {
1534         case USBDEVFS_CONTROL:
1535                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1536                 ret = proc_control(ps, p);
1537                 if (ret >= 0)
1538                         inode->i_mtime = CURRENT_TIME;
1539                 break;
1540
1541         case USBDEVFS_BULK:
1542                 snoop(&dev->dev, "%s: BULK\n", __func__);
1543                 ret = proc_bulk(ps, p);
1544                 if (ret >= 0)
1545                         inode->i_mtime = CURRENT_TIME;
1546                 break;
1547
1548         case USBDEVFS_RESETEP:
1549                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1550                 ret = proc_resetep(ps, p);
1551                 if (ret >= 0)
1552                         inode->i_mtime = CURRENT_TIME;
1553                 break;
1554
1555         case USBDEVFS_RESET:
1556                 snoop(&dev->dev, "%s: RESET\n", __func__);
1557                 ret = proc_resetdevice(ps);
1558                 break;
1559
1560         case USBDEVFS_CLEAR_HALT:
1561                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1562                 ret = proc_clearhalt(ps, p);
1563                 if (ret >= 0)
1564                         inode->i_mtime = CURRENT_TIME;
1565                 break;
1566
1567         case USBDEVFS_GETDRIVER:
1568                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1569                 ret = proc_getdriver(ps, p);
1570                 break;
1571
1572         case USBDEVFS_CONNECTINFO:
1573                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1574                 ret = proc_connectinfo(ps, p);
1575                 break;
1576
1577         case USBDEVFS_SETINTERFACE:
1578                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1579                 ret = proc_setintf(ps, p);
1580                 break;
1581
1582         case USBDEVFS_SETCONFIGURATION:
1583                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1584                 ret = proc_setconfig(ps, p);
1585                 break;
1586
1587         case USBDEVFS_SUBMITURB:
1588                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1589                 ret = proc_submiturb(ps, p);
1590                 if (ret >= 0)
1591                         inode->i_mtime = CURRENT_TIME;
1592                 break;
1593
1594 #ifdef CONFIG_COMPAT
1595
1596         case USBDEVFS_SUBMITURB32:
1597                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1598                 ret = proc_submiturb_compat(ps, p);
1599                 if (ret >= 0)
1600                         inode->i_mtime = CURRENT_TIME;
1601                 break;
1602
1603         case USBDEVFS_REAPURB32:
1604                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1605                 ret = proc_reapurb_compat(ps, p);
1606                 break;
1607
1608         case USBDEVFS_REAPURBNDELAY32:
1609                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __func__);
1610                 ret = proc_reapurbnonblock_compat(ps, p);
1611                 break;
1612
1613         case USBDEVFS_IOCTL32:
1614                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1615                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1616                 break;
1617 #endif
1618
1619         case USBDEVFS_DISCARDURB:
1620                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1621                 ret = proc_unlinkurb(ps, p);
1622                 break;
1623
1624         case USBDEVFS_REAPURB:
1625                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1626                 ret = proc_reapurb(ps, p);
1627                 break;
1628
1629         case USBDEVFS_REAPURBNDELAY:
1630                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __func__);
1631                 ret = proc_reapurbnonblock(ps, p);
1632                 break;
1633
1634         case USBDEVFS_DISCSIGNAL:
1635                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1636                 ret = proc_disconnectsignal(ps, p);
1637                 break;
1638
1639         case USBDEVFS_CLAIMINTERFACE:
1640                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1641                 ret = proc_claiminterface(ps, p);
1642                 break;
1643
1644         case USBDEVFS_RELEASEINTERFACE:
1645                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1646                 ret = proc_releaseinterface(ps, p);
1647                 break;
1648
1649         case USBDEVFS_IOCTL:
1650                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1651                 ret = proc_ioctl_default(ps, p);
1652                 break;
1653         }
1654         usb_unlock_device(dev);
1655         if (ret >= 0)
1656                 inode->i_atime = CURRENT_TIME;
1657         return ret;
1658 }
1659
1660 /* No kernel lock - fine */
1661 static unsigned int usbdev_poll(struct file *file,
1662                                 struct poll_table_struct *wait)
1663 {
1664         struct dev_state *ps = file->private_data;
1665         unsigned int mask = 0;
1666
1667         poll_wait(file, &ps->wait, wait);
1668         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1669                 mask |= POLLOUT | POLLWRNORM;
1670         if (!connected(ps))
1671                 mask |= POLLERR | POLLHUP;
1672         return mask;
1673 }
1674
1675 const struct file_operations usbdev_file_operations = {
1676         .owner =        THIS_MODULE,
1677         .llseek =       usbdev_lseek,
1678         .read =         usbdev_read,
1679         .poll =         usbdev_poll,
1680         .ioctl =        usbdev_ioctl,
1681         .open =         usbdev_open,
1682         .release =      usbdev_release,
1683 };
1684
1685 #ifdef CONFIG_USB_DEVICE_CLASS
1686 static struct class *usb_classdev_class;
1687
1688 static int usb_classdev_add(struct usb_device *dev)
1689 {
1690         int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1691
1692         dev->usb_classdev = device_create(usb_classdev_class, &dev->dev,
1693                                 MKDEV(USB_DEVICE_MAJOR, minor),
1694                                 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1695         if (IS_ERR(dev->usb_classdev))
1696                 return PTR_ERR(dev->usb_classdev);
1697
1698         return 0;
1699 }
1700
1701 static void usb_classdev_remove(struct usb_device *dev)
1702 {
1703         device_unregister(dev->usb_classdev);
1704 }
1705
1706 static int usb_classdev_notify(struct notifier_block *self,
1707                                unsigned long action, void *dev)
1708 {
1709         switch (action) {
1710         case USB_DEVICE_ADD:
1711                 if (usb_classdev_add(dev))
1712                         return NOTIFY_BAD;
1713                 break;
1714         case USB_DEVICE_REMOVE:
1715                 usb_classdev_remove(dev);
1716                 break;
1717         }
1718         return NOTIFY_OK;
1719 }
1720
1721 static struct notifier_block usbdev_nb = {
1722         .notifier_call =        usb_classdev_notify,
1723 };
1724 #endif
1725
1726 static struct cdev usb_device_cdev;
1727
1728 int __init usb_devio_init(void)
1729 {
1730         int retval;
1731
1732         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1733                                         "usb_device");
1734         if (retval) {
1735                 err("unable to register minors for usb_device");
1736                 goto out;
1737         }
1738         cdev_init(&usb_device_cdev, &usbdev_file_operations);
1739         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1740         if (retval) {
1741                 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1742                 goto error_cdev;
1743         }
1744 #ifdef CONFIG_USB_DEVICE_CLASS
1745         usb_classdev_class = class_create(THIS_MODULE, "usb_device");
1746         if (IS_ERR(usb_classdev_class)) {
1747                 err("unable to register usb_device class");
1748                 retval = PTR_ERR(usb_classdev_class);
1749                 cdev_del(&usb_device_cdev);
1750                 usb_classdev_class = NULL;
1751                 goto out;
1752         }
1753
1754         usb_register_notify(&usbdev_nb);
1755 #endif
1756 out:
1757         return retval;
1758
1759 error_cdev:
1760         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1761         goto out;
1762 }
1763
1764 void usb_devio_cleanup(void)
1765 {
1766 #ifdef CONFIG_USB_DEVICE_CLASS
1767         usb_unregister_notify(&usbdev_nb);
1768         class_destroy(usb_classdev_class);
1769 #endif
1770         cdev_del(&usb_device_cdev);
1771         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1772 }