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         /* Protect against simultaneous removal or release */
 569         mutex_lock(&usbfs_mutex);
 570
 571         ret = -ENOMEM;
 572         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
 573         if (!ps)
 574                 goto out;
 575
 576         ret = -ENOENT;
 577         /* usbdev device-node */
 578         if (imajor(inode) == USB_DEVICE_MAJOR)
 579                 dev = usbdev_lookup_by_minor(iminor(inode));
 580 #ifdef CONFIG_USB_DEVICEFS
 581         /* procfs file */
 582         if (!dev)
 583                 dev = inode->i_private;
 584 #endif
 585         if (!dev)
 586                 goto out;
 587         ret = usb_autoresume_device(dev);
 588         if (ret)
 589                 goto out;
 590
 591         usb_get_dev(dev);
 592         ret = 0;
 593         ps->dev = dev;
 594         ps->file = file;
 595         spin_lock_init(&ps->lock);
 596         INIT_LIST_HEAD(&ps->list);
 597         INIT_LIST_HEAD(&ps->async_pending);
 598         INIT_LIST_HEAD(&ps->async_completed);
 599         init_waitqueue_head(&ps->wait);
 600         ps->discsignr = 0;
 601         ps->disc_pid = get_pid(task_pid(current));
 602         ps->disc_uid = current->uid;
 603         ps->disc_euid = current->euid;
 604         ps->disccontext = NULL;
 605         ps->ifclaimed = 0;
 606         security_task_getsecid(current, &ps->secid);
 607         smp_wmb();
 608         list_add_tail(&ps->list, &dev->filelist);
 609         file->private_data = ps;
 610  out:
 611         if (ret)
 612                 kfree(ps);
 613         mutex_unlock(&usbfs_mutex);
 614         return ret;
 615 }
 616
 617 static int usbdev_release(struct inode *inode, struct file *file)
 618 {
 619         struct dev_state *ps = file->private_data;
 620         struct usb_device *dev = ps->dev;
 621         unsigned int ifnum;
 622
 623         usb_lock_device(dev);
 624
 625         /* Protect against simultaneous open */
 626         mutex_lock(&usbfs_mutex);
 627         list_del_init(&ps->list);
 628         mutex_unlock(&usbfs_mutex);
 629
 630         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 631                         ifnum++) {
 632                 if (test_bit(ifnum, &ps->ifclaimed))
 633                         releaseintf(ps, ifnum);
 634         }
 635         destroy_all_async(ps);
 636         usb_autosuspend_device(dev);
 637         usb_unlock_device(dev);
 638         usb_put_dev(dev);
 639         put_pid(ps->disc_pid);
 640         kfree(ps);
 641         return 0;
 642 }
 643
 644 static int proc_control(struct dev_state *ps, void __user *arg)
 645 {
 646         struct usb_device *dev = ps->dev;
 647         struct usbdevfs_ctrltransfer ctrl;
 648         unsigned int tmo;
 649         unsigned char *tbuf;
 650         unsigned wLength;
 651         int i, j, ret;
 652
 653         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 654                 return -EFAULT;
 655         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
 656         if (ret)
 657                 return ret;
 658         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
 659         if (wLength > PAGE_SIZE)
 660                 return -EINVAL;
 661         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
 662         if (!tbuf)
 663                 return -ENOMEM;
 664         tmo = ctrl.timeout;
 665         if (ctrl.bRequestType & 0x80) {
 666                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
 667                                                ctrl.wLength)) {
 668                         free_page((unsigned long)tbuf);
 669                         return -EINVAL;
 670                 }
 671                 snoop(&dev->dev, "control read: 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
 677                 usb_unlock_device(dev);
 678                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest,
 679                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 680                                     tbuf, ctrl.wLength, tmo);
 681                 usb_lock_device(dev);
 682                 if ((i > 0) && ctrl.wLength) {
 683                         if (usbfs_snoop) {
 684                                 dev_info(&dev->dev, "control read: data ");
 685                                 for (j = 0; j < i; ++j)
 686                                         printk("%02x ", (u8)(tbuf)[j]);
 687                                 printk("\n");
 688                         }
 689                         if (copy_to_user(ctrl.data, tbuf, i)) {
 690                                 free_page((unsigned long)tbuf);
 691                                 return -EFAULT;
 692                         }
 693                 }
 694         } else {
 695                 if (ctrl.wLength) {
 696                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 697                                 free_page((unsigned long)tbuf);
 698                                 return -EFAULT;
 699                         }
 700                 }
 701                 snoop(&dev->dev, "control write: bRequest=%02x "
 702                                 "bRrequestType=%02x wValue=%04x "
 703                                 "wIndex=%04x wLength=%04x\n",
 704                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 705                                 ctrl.wIndex, ctrl.wLength);
 706                 if (usbfs_snoop) {
 707                         dev_info(&dev->dev, "control write: data: ");
 708                         for (j = 0; j < ctrl.wLength; ++j)
 709                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 710                         printk("\n");
 711                 }
 712                 usb_unlock_device(dev);
 713                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
 714                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 715                                     tbuf, ctrl.wLength, tmo);
 716                 usb_lock_device(dev);
 717         }
 718         free_page((unsigned long)tbuf);
 719         if (i < 0 && i != -EPIPE) {
 720                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 721                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 722                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 723                            ctrl.wLength, i);
 724         }
 725         return i;
 726 }
 727
 728 static int proc_bulk(struct dev_state *ps, void __user *arg)
 729 {
 730         struct usb_device *dev = ps->dev;
 731         struct usbdevfs_bulktransfer bulk;
 732         unsigned int tmo, len1, pipe;
 733         int len2;
 734         unsigned char *tbuf;
 735         int i, j, ret;
 736
 737         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 738                 return -EFAULT;
 739         ret = findintfep(ps->dev, bulk.ep);
 740         if (ret < 0)
 741                 return ret;
 742         ret = checkintf(ps, ret);
 743         if (ret)
 744                 return ret;
 745         if (bulk.ep & USB_DIR_IN)
 746                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 747         else
 748                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 749         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 750                 return -EINVAL;
 751         len1 = bulk.len;
 752         if (len1 > MAX_USBFS_BUFFER_SIZE)
 753                 return -EINVAL;
 754         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 755                 return -ENOMEM;
 756         tmo = bulk.timeout;
 757         if (bulk.ep & 0x80) {
 758                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 759                         kfree(tbuf);
 760                         return -EINVAL;
 761                 }
 762                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
 763                         bulk.len, bulk.timeout);
 764                 usb_unlock_device(dev);
 765                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 766                 usb_lock_device(dev);
 767                 if (!i && len2) {
 768                         if (usbfs_snoop) {
 769                                 dev_info(&dev->dev, "bulk read: data ");
 770                                 for (j = 0; j < len2; ++j)
 771                                         printk("%02x ", (u8)(tbuf)[j]);
 772                                 printk("\n");
 773                         }
 774                         if (copy_to_user(bulk.data, tbuf, len2)) {
 775                                 kfree(tbuf);
 776                                 return -EFAULT;
 777                         }
 778                 }
 779         } else {
 780                 if (len1) {
 781                         if (copy_from_user(tbuf, bulk.data, len1)) {
 782                                 kfree(tbuf);
 783                                 return -EFAULT;
 784                         }
 785                 }
 786                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
 787                         bulk.len, bulk.timeout);
 788                 if (usbfs_snoop) {
 789                         dev_info(&dev->dev, "bulk write: data: ");
 790                         for (j = 0; j < len1; ++j)
 791                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 792                         printk("\n");
 793                 }
 794                 usb_unlock_device(dev);
 795                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 796                 usb_lock_device(dev);
 797         }
 798         kfree(tbuf);
 799         if (i < 0)
 800                 return i;
 801         return len2;
 802 }
 803
 804 static int proc_resetep(struct dev_state *ps, void __user *arg)
 805 {
 806         unsigned int ep;
 807         int ret;
 808
 809         if (get_user(ep, (unsigned int __user *)arg))
 810                 return -EFAULT;
 811         ret = findintfep(ps->dev, ep);
 812         if (ret < 0)
 813                 return ret;
 814         ret = checkintf(ps, ret);
 815         if (ret)
 816                 return ret;
 817         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
 818         return 0;
 819 }
 820
 821 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 822 {
 823         unsigned int ep;
 824         int pipe;
 825         int ret;
 826
 827         if (get_user(ep, (unsigned int __user *)arg))
 828                 return -EFAULT;
 829         ret = findintfep(ps->dev, ep);
 830         if (ret < 0)
 831                 return ret;
 832         ret = checkintf(ps, ret);
 833         if (ret)
 834                 return ret;
 835         if (ep & USB_DIR_IN)
 836                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 837         else
 838                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 839
 840         return usb_clear_halt(ps->dev, pipe);
 841 }
 842
 843 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 844 {
 845         struct usbdevfs_getdriver gd;
 846         struct usb_interface *intf;
 847         int ret;
 848
 849         if (copy_from_user(&gd, arg, sizeof(gd)))
 850                 return -EFAULT;
 851         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 852         if (!intf || !intf->dev.driver)
 853                 ret = -ENODATA;
 854         else {
 855                 strncpy(gd.driver, intf->dev.driver->name,
 856                                 sizeof(gd.driver));
 857                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 858         }
 859         return ret;
 860 }
 861
 862 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 863 {
 864         struct usbdevfs_connectinfo ci;
 865
 866         ci.devnum = ps->dev->devnum;
 867         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 868         if (copy_to_user(arg, &ci, sizeof(ci)))
 869                 return -EFAULT;
 870         return 0;
 871 }
 872
 873 static int proc_resetdevice(struct dev_state *ps)
 874 {
 875         return usb_reset_composite_device(ps->dev, NULL);
 876 }
 877
 878 static int proc_setintf(struct dev_state *ps, void __user *arg)
 879 {
 880         struct usbdevfs_setinterface setintf;
 881         int ret;
 882
 883         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 884                 return -EFAULT;
 885         if ((ret = checkintf(ps, setintf.interface)))
 886                 return ret;
 887         return usb_set_interface(ps->dev, setintf.interface,
 888                         setintf.altsetting);
 889 }
 890
 891 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 892 {
 893         int u;
 894         int status = 0;
 895         struct usb_host_config *actconfig;
 896
 897         if (get_user(u, (int __user *)arg))
 898                 return -EFAULT;
 899
 900         actconfig = ps->dev->actconfig;
 901
 902         /* Don't touch the device if any interfaces are claimed.
 903          * It could interfere with other drivers' operations, and if
 904          * an interface is claimed by usbfs it could easily deadlock.
 905          */
 906         if (actconfig) {
 907                 int i;
 908
 909                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 910                         if (usb_interface_claimed(actconfig->interface[i])) {
 911                                 dev_warn(&ps->dev->dev,
 912                                         "usbfs: interface %d claimed by %s "
 913                                         "while '%s' sets config #%d\n",
 914                                         actconfig->interface[i]
 915                                                 ->cur_altsetting
 916                                                 ->desc.bInterfaceNumber,
 917                                         actconfig->interface[i]
 918                                                 ->dev.driver->name,
 919                                         current->comm, u);
 920                                 status = -EBUSY;
 921                                 break;
 922                         }
 923                 }
 924         }
 925
 926         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 927          * so avoid usb_set_configuration()'s kick to sysfs
 928          */
 929         if (status == 0) {
 930                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 931                         status = usb_reset_configuration(ps->dev);
 932                 else
 933                         status = usb_set_configuration(ps->dev, u);
 934         }
 935
 936         return status;
 937 }
 938
 939 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 940                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
 941                         void __user *arg)
 942 {
 943         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 944         struct usb_host_endpoint *ep;
 945         struct async *as;
 946         struct usb_ctrlrequest *dr = NULL;
 947         unsigned int u, totlen, isofrmlen;
 948         int ret, ifnum = -1;
 949         int is_in;
 950
 951         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
 952                            URB_NO_FSBR|URB_ZERO_PACKET))
 953                 return -EINVAL;
 954         if (!uurb->buffer)
 955                 return -EINVAL;
 956         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN ||
 957                                  uurb->signr > SIGRTMAX))
 958                 return -EINVAL;
 959         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
 960             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
 961                 ifnum = findintfep(ps->dev, uurb->endpoint);
 962                 if (ifnum < 0)
 963                         return ifnum;
 964                 ret = checkintf(ps, ifnum);
 965                 if (ret)
 966                         return ret;
 967         }
 968         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
 969                 is_in = 1;
 970                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 971         } else {
 972                 is_in = 0;
 973                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 974         }
 975         if (!ep)
 976                 return -ENOENT;
 977         switch(uurb->type) {
 978         case USBDEVFS_URB_TYPE_CONTROL:
 979                 if (!usb_endpoint_xfer_control(&ep->desc))
 980                         return -EINVAL;
 981                 /* min 8 byte setup packet,
 982                  * max 8 byte setup plus an arbitrary data stage */
 983                 if (uurb->buffer_length < 8 ||
 984                     uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
 985                         return -EINVAL;
 986                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
 987                 if (!dr)
 988                         return -ENOMEM;
 989                 if (copy_from_user(dr, uurb->buffer, 8)) {
 990                         kfree(dr);
 991                         return -EFAULT;
 992                 }
 993                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
 994                         kfree(dr);
 995                         return -EINVAL;
 996                 }
 997                 ret = check_ctrlrecip(ps, dr->bRequestType,
 998                                       le16_to_cpup(&dr->wIndex));
 999                 if (ret) {
1000                         kfree(dr);
1001                         return ret;
1002                 }
1003                 uurb->number_of_packets = 0;
1004                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1005                 uurb->buffer += 8;
1006                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1007                         is_in = 1;
1008                         uurb->endpoint |= USB_DIR_IN;
1009                 } else {
1010                         is_in = 0;
1011                         uurb->endpoint &= ~USB_DIR_IN;
1012                 }
1013                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1014                                 uurb->buffer, uurb->buffer_length)) {
1015                         kfree(dr);
1016                         return -EFAULT;
1017                 }
1018                 snoop(&ps->dev->dev, "control urb: bRequest=%02x "
1019                         "bRrequestType=%02x wValue=%04x "
1020                         "wIndex=%04x wLength=%04x\n",
1021                         dr->bRequest, dr->bRequestType,
1022                         __le16_to_cpup(&dr->wValue),
1023                         __le16_to_cpup(&dr->wIndex),
1024                         __le16_to_cpup(&dr->wLength));
1025                 break;
1026
1027         case USBDEVFS_URB_TYPE_BULK:
1028                 switch (usb_endpoint_type(&ep->desc)) {
1029                 case USB_ENDPOINT_XFER_CONTROL:
1030                 case USB_ENDPOINT_XFER_ISOC:
1031                         return -EINVAL;
1032                 /* allow single-shot interrupt transfers, at bogus rates */
1033                 }
1034                 uurb->number_of_packets = 0;
1035                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1036                         return -EINVAL;
1037                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1038                                 uurb->buffer, uurb->buffer_length))
1039                         return -EFAULT;
1040                 snoop(&ps->dev->dev, "bulk urb\n");
1041                 break;
1042
1043         case USBDEVFS_URB_TYPE_ISO:
1044                 /* arbitrary limit */
1045                 if (uurb->number_of_packets < 1 ||
1046                     uurb->number_of_packets > 128)
1047                         return -EINVAL;
1048                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1049                         return -EINVAL;
1050                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1051                                    uurb->number_of_packets;
1052                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1053                         return -ENOMEM;
1054                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1055                         kfree(isopkt);
1056                         return -EFAULT;
1057                 }
1058                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1059                         /* arbitrary limit,
1060                          * sufficient for USB 2.0 high-bandwidth iso */
1061                         if (isopkt[u].length > 8192) {
1062                                 kfree(isopkt);
1063                                 return -EINVAL;
1064                         }
1065                         totlen += isopkt[u].length;
1066                 }
1067                 if (totlen > 32768) {
1068                         kfree(isopkt);
1069                         return -EINVAL;
1070                 }
1071                 uurb->buffer_length = totlen;
1072                 snoop(&ps->dev->dev, "iso urb\n");
1073                 break;
1074
1075         case USBDEVFS_URB_TYPE_INTERRUPT:
1076                 uurb->number_of_packets = 0;
1077                 if (!usb_endpoint_xfer_int(&ep->desc))
1078                         return -EINVAL;
1079                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1080                         return -EINVAL;
1081                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1082                                 uurb->buffer, uurb->buffer_length))
1083                         return -EFAULT;
1084                 snoop(&ps->dev->dev, "interrupt urb\n");
1085                 break;
1086
1087         default:
1088                 return -EINVAL;
1089         }
1090         as = alloc_async(uurb->number_of_packets);
1091         if (!as) {
1092                 kfree(isopkt);
1093                 kfree(dr);
1094                 return -ENOMEM;
1095         }
1096         as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL);
1097         if (!as->urb->transfer_buffer) {
1098                 kfree(isopkt);
1099                 kfree(dr);
1100                 free_async(as);
1101                 return -ENOMEM;
1102         }
1103         as->urb->dev = ps->dev;
1104         as->urb->pipe = (uurb->type << 30) |
1105                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1106                         (uurb->endpoint & USB_DIR_IN);
1107         as->urb->transfer_flags = uurb->flags |
1108                         (is_in ? URB_DIR_IN : URB_DIR_OUT);
1109         as->urb->transfer_buffer_length = uurb->buffer_length;
1110         as->urb->setup_packet = (unsigned char *)dr;
1111         as->urb->start_frame = uurb->start_frame;
1112         as->urb->number_of_packets = uurb->number_of_packets;
1113         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1114                         ps->dev->speed == USB_SPEED_HIGH)
1115                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1116         else
1117                 as->urb->interval = ep->desc.bInterval;
1118         as->urb->context = as;
1119         as->urb->complete = async_completed;
1120         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1121                 as->urb->iso_frame_desc[u].offset = totlen;
1122                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1123                 totlen += isopkt[u].length;
1124         }
1125         kfree(isopkt);
1126         as->ps = ps;
1127         as->userurb = arg;
1128         if (uurb->endpoint & USB_DIR_IN)
1129                 as->userbuffer = uurb->buffer;
1130         else
1131                 as->userbuffer = NULL;
1132         as->signr = uurb->signr;
1133         as->ifnum = ifnum;
1134         as->pid = get_pid(task_pid(current));
1135         as->uid = current->uid;
1136         as->euid = current->euid;
1137         security_task_getsecid(current, &as->secid);
1138         if (!is_in) {
1139                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1140                                 as->urb->transfer_buffer_length)) {
1141                         free_async(as);
1142                         return -EFAULT;
1143                 }
1144         }
1145         snoop_urb(as->urb, as->userurb);
1146         async_newpending(as);
1147         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1148                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1149                            "usbfs: usb_submit_urb returned %d\n", ret);
1150                 async_removepending(as);
1151                 free_async(as);
1152                 return ret;
1153         }
1154         return 0;
1155 }
1156
1157 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1158 {
1159         struct usbdevfs_urb uurb;
1160
1161         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1162                 return -EFAULT;
1163
1164         return proc_do_submiturb(ps, &uurb,
1165                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1166                         arg);
1167 }
1168
1169 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1170 {
1171         struct async *as;
1172
1173         as = async_getpending(ps, arg);
1174         if (!as)
1175                 return -EINVAL;
1176         usb_kill_urb(as->urb);
1177         return 0;
1178 }
1179
1180 static int processcompl(struct async *as, void __user * __user *arg)
1181 {
1182         struct urb *urb = as->urb;
1183         struct usbdevfs_urb __user *userurb = as->userurb;
1184         void __user *addr = as->userurb;
1185         unsigned int i;
1186
1187         if (as->userbuffer)
1188                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1189                                  urb->transfer_buffer_length))
1190                         return -EFAULT;
1191         if (put_user(as->status, &userurb->status))
1192                 return -EFAULT;
1193         if (put_user(urb->actual_length, &userurb->actual_length))
1194                 return -EFAULT;
1195         if (put_user(urb->error_count, &userurb->error_count))
1196                 return -EFAULT;
1197
1198         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1199                 for (i = 0; i < urb->number_of_packets; i++) {
1200                         if (put_user(urb->iso_frame_desc[i].actual_length,
1201                                      &userurb->iso_frame_desc[i].actual_length))
1202                                 return -EFAULT;
1203                         if (put_user(urb->iso_frame_desc[i].status,
1204                                      &userurb->iso_frame_desc[i].status))
1205                                 return -EFAULT;
1206                 }
1207         }
1208
1209         free_async(as);
1210
1211         if (put_user(addr, (void __user * __user *)arg))
1212                 return -EFAULT;
1213         return 0;
1214 }
1215
1216 static struct async *reap_as(struct dev_state *ps)
1217 {
1218         DECLARE_WAITQUEUE(wait, current);
1219         struct async *as = NULL;
1220         struct usb_device *dev = ps->dev;
1221
1222         add_wait_queue(&ps->wait, &wait);
1223         for (;;) {
1224                 __set_current_state(TASK_INTERRUPTIBLE);
1225                 as = async_getcompleted(ps);
1226                 if (as)
1227                         break;
1228                 if (signal_pending(current))
1229                         break;
1230                 usb_unlock_device(dev);
1231                 schedule();
1232                 usb_lock_device(dev);
1233         }
1234         remove_wait_queue(&ps->wait, &wait);
1235         set_current_state(TASK_RUNNING);
1236         return as;
1237 }
1238
1239 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1240 {
1241         struct async *as = reap_as(ps);
1242         if (as)
1243                 return processcompl(as, (void __user * __user *)arg);
1244         if (signal_pending(current))
1245                 return -EINTR;
1246         return -EIO;
1247 }
1248
1249 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1250 {
1251         struct async *as;
1252
1253         if (!(as = async_getcompleted(ps)))
1254                 return -EAGAIN;
1255         return processcompl(as, (void __user * __user *)arg);
1256 }
1257
1258 #ifdef CONFIG_COMPAT
1259
1260 static int get_urb32(struct usbdevfs_urb *kurb,
1261                      struct usbdevfs_urb32 __user *uurb)
1262 {
1263         __u32  uptr;
1264         if (get_user(kurb->type, &uurb->type) ||
1265             __get_user(kurb->endpoint, &uurb->endpoint) ||
1266             __get_user(kurb->status, &uurb->status) ||
1267             __get_user(kurb->flags, &uurb->flags) ||
1268             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1269             __get_user(kurb->actual_length, &uurb->actual_length) ||
1270             __get_user(kurb->start_frame, &uurb->start_frame) ||
1271             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1272             __get_user(kurb->error_count, &uurb->error_count) ||
1273             __get_user(kurb->signr, &uurb->signr))
1274                 return -EFAULT;
1275
1276         if (__get_user(uptr, &uurb->buffer))
1277                 return -EFAULT;
1278         kurb->buffer = compat_ptr(uptr);
1279         if (__get_user(uptr, &uurb->buffer))
1280                 return -EFAULT;
1281         kurb->usercontext = compat_ptr(uptr);
1282
1283         return 0;
1284 }
1285
1286 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1287 {
1288         struct usbdevfs_urb uurb;
1289
1290         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1291                 return -EFAULT;
1292
1293         return proc_do_submiturb(ps, &uurb,
1294                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1295                         arg);
1296 }
1297
1298 static int processcompl_compat(struct async *as, void __user * __user *arg)
1299 {
1300         struct urb *urb = as->urb;
1301         struct usbdevfs_urb32 __user *userurb = as->userurb;
1302         void __user *addr = as->userurb;
1303         unsigned int i;
1304
1305         if (as->userbuffer)
1306                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1307                                  urb->transfer_buffer_length))
1308                         return -EFAULT;
1309         if (put_user(as->status, &userurb->status))
1310                 return -EFAULT;
1311         if (put_user(urb->actual_length, &userurb->actual_length))
1312                 return -EFAULT;
1313         if (put_user(urb->error_count, &userurb->error_count))
1314                 return -EFAULT;
1315
1316         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1317                 for (i = 0; i < urb->number_of_packets; i++) {
1318                         if (put_user(urb->iso_frame_desc[i].actual_length,
1319                                      &userurb->iso_frame_desc[i].actual_length))
1320                                 return -EFAULT;
1321                         if (put_user(urb->iso_frame_desc[i].status,
1322                                      &userurb->iso_frame_desc[i].status))
1323                                 return -EFAULT;
1324                 }
1325         }
1326
1327         free_async(as);
1328         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1329                 return -EFAULT;
1330         return 0;
1331 }
1332
1333 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1334 {
1335         struct async *as = reap_as(ps);
1336         if (as)
1337                 return processcompl_compat(as, (void __user * __user *)arg);
1338         if (signal_pending(current))
1339                 return -EINTR;
1340         return -EIO;
1341 }
1342
1343 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1344 {
1345         struct async *as;
1346
1347         if (!(as = async_getcompleted(ps)))
1348                 return -EAGAIN;
1349         return processcompl_compat(as, (void __user * __user *)arg);
1350 }
1351
1352 #endif
1353
1354 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1355 {
1356         struct usbdevfs_disconnectsignal ds;
1357
1358         if (copy_from_user(&ds, arg, sizeof(ds)))
1359                 return -EFAULT;
1360         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1361                 return -EINVAL;
1362         ps->discsignr = ds.signr;
1363         ps->disccontext = ds.context;
1364         return 0;
1365 }
1366
1367 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1368 {
1369         unsigned int ifnum;
1370
1371         if (get_user(ifnum, (unsigned int __user *)arg))
1372                 return -EFAULT;
1373         return claimintf(ps, ifnum);
1374 }
1375
1376 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1377 {
1378         unsigned int ifnum;
1379         int ret;
1380
1381         if (get_user(ifnum, (unsigned int __user *)arg))
1382                 return -EFAULT;
1383         if ((ret = releaseintf(ps, ifnum)) < 0)
1384                 return ret;
1385         destroy_async_on_interface (ps, ifnum);
1386         return 0;
1387 }
1388
1389 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1390 {
1391         int                     size;
1392         void                    *buf = NULL;
1393         int                     retval = 0;
1394         struct usb_interface    *intf = NULL;
1395         struct usb_driver       *driver = NULL;
1396
1397         /* alloc buffer */
1398         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1399                 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1400                         return -ENOMEM;
1401                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1402                         if (copy_from_user(buf, ctl->data, size)) {
1403                                 kfree(buf);
1404                                 return -EFAULT;
1405                         }
1406                 } else {
1407                         memset(buf, 0, size);
1408                 }
1409         }
1410
1411         if (!connected(ps)) {
1412                 kfree(buf);
1413                 return -ENODEV;
1414         }
1415
1416         if (ps->dev->state != USB_STATE_CONFIGURED)
1417                 retval = -EHOSTUNREACH;
1418         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1419                 retval = -EINVAL;
1420         else switch (ctl->ioctl_code) {
1421
1422         /* disconnect kernel driver from interface */
1423         case USBDEVFS_DISCONNECT:
1424                 if (intf->dev.driver) {
1425                         driver = to_usb_driver(intf->dev.driver);
1426                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1427                         usb_driver_release_interface(driver, intf);
1428                 } else
1429                         retval = -ENODATA;
1430                 break;
1431
1432         /* let kernel drivers try to (re)bind to the interface */
1433         case USBDEVFS_CONNECT:
1434                 if (!intf->dev.driver)
1435                         retval = device_attach(&intf->dev);
1436                 else
1437                         retval = -EBUSY;
1438                 break;
1439
1440         /* talk directly to the interface's driver */
1441         default:
1442                 if (intf->dev.driver)
1443                         driver = to_usb_driver(intf->dev.driver);
1444                 if (driver == NULL || driver->ioctl == NULL) {
1445                         retval = -ENOTTY;
1446                 } else {
1447                         retval = driver->ioctl(intf, ctl->ioctl_code, buf);
1448                         if (retval == -ENOIOCTLCMD)
1449                                 retval = -ENOTTY;
1450                 }
1451         }
1452
1453         /* cleanup and return */
1454         if (retval >= 0
1455                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1456                         && size > 0
1457                         && copy_to_user(ctl->data, buf, size) != 0)
1458                 retval = -EFAULT;
1459
1460         kfree(buf);
1461         return retval;
1462 }
1463
1464 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1465 {
1466         struct usbdevfs_ioctl   ctrl;
1467
1468         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1469                 return -EFAULT;
1470         return proc_ioctl(ps, &ctrl);
1471 }
1472
1473 #ifdef CONFIG_COMPAT
1474 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1475 {
1476         struct usbdevfs_ioctl32 __user *uioc;
1477         struct usbdevfs_ioctl ctrl;
1478         u32 udata;
1479
1480         uioc = compat_ptr((long)arg);
1481         if (get_user(ctrl.ifno, &uioc->ifno) ||
1482             get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1483             __get_user(udata, &uioc->data))
1484                 return -EFAULT;
1485         ctrl.data = compat_ptr(udata);
1486
1487         return proc_ioctl(ps, &ctrl);
1488 }
1489 #endif
1490
1491 /*
1492  * NOTE:  All requests here that have interface numbers as parameters
1493  * are assuming that somehow the configuration has been prevented from
1494  * changing.  But there's no mechanism to ensure that...
1495  */
1496 static int usbdev_ioctl(struct inode *inode, struct file *file,
1497                         unsigned int cmd, unsigned long arg)
1498 {
1499         struct dev_state *ps = file->private_data;
1500         struct usb_device *dev = ps->dev;
1501         void __user *p = (void __user *)arg;
1502         int ret = -ENOTTY;
1503
1504         if (!(file->f_mode & FMODE_WRITE))
1505                 return -EPERM;
1506         usb_lock_device(dev);
1507         if (!connected(ps)) {
1508                 usb_unlock_device(dev);
1509                 return -ENODEV;
1510         }
1511
1512         switch (cmd) {
1513         case USBDEVFS_CONTROL:
1514                 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
1515                 ret = proc_control(ps, p);
1516                 if (ret >= 0)
1517                         inode->i_mtime = CURRENT_TIME;
1518                 break;
1519
1520         case USBDEVFS_BULK:
1521                 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
1522                 ret = proc_bulk(ps, p);
1523                 if (ret >= 0)
1524                         inode->i_mtime = CURRENT_TIME;
1525                 break;
1526
1527         case USBDEVFS_RESETEP:
1528                 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
1529                 ret = proc_resetep(ps, p);
1530                 if (ret >= 0)
1531                         inode->i_mtime = CURRENT_TIME;
1532                 break;
1533
1534         case USBDEVFS_RESET:
1535                 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
1536                 ret = proc_resetdevice(ps);
1537                 break;
1538
1539         case USBDEVFS_CLEAR_HALT:
1540                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
1541                 ret = proc_clearhalt(ps, p);
1542                 if (ret >= 0)
1543                         inode->i_mtime = CURRENT_TIME;
1544                 break;
1545
1546         case USBDEVFS_GETDRIVER:
1547                 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
1548                 ret = proc_getdriver(ps, p);
1549                 break;
1550
1551         case USBDEVFS_CONNECTINFO:
1552                 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
1553                 ret = proc_connectinfo(ps, p);
1554                 break;
1555
1556         case USBDEVFS_SETINTERFACE:
1557                 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
1558                 ret = proc_setintf(ps, p);
1559                 break;
1560
1561         case USBDEVFS_SETCONFIGURATION:
1562                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
1563                 ret = proc_setconfig(ps, p);
1564                 break;
1565
1566         case USBDEVFS_SUBMITURB:
1567                 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
1568                 ret = proc_submiturb(ps, p);
1569                 if (ret >= 0)
1570                         inode->i_mtime = CURRENT_TIME;
1571                 break;
1572
1573 #ifdef CONFIG_COMPAT
1574
1575         case USBDEVFS_SUBMITURB32:
1576                 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
1577                 ret = proc_submiturb_compat(ps, p);
1578                 if (ret >= 0)
1579                         inode->i_mtime = CURRENT_TIME;
1580                 break;
1581
1582         case USBDEVFS_REAPURB32:
1583                 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
1584                 ret = proc_reapurb_compat(ps, p);
1585                 break;
1586
1587         case USBDEVFS_REAPURBNDELAY32:
1588                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
1589                 ret = proc_reapurbnonblock_compat(ps, p);
1590                 break;
1591
1592         case USBDEVFS_IOCTL32:
1593                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1594                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1595                 break;
1596 #endif
1597
1598         case USBDEVFS_DISCARDURB:
1599                 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
1600                 ret = proc_unlinkurb(ps, p);
1601                 break;
1602
1603         case USBDEVFS_REAPURB:
1604                 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
1605                 ret = proc_reapurb(ps, p);
1606                 break;
1607
1608         case USBDEVFS_REAPURBNDELAY:
1609                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
1610                 ret = proc_reapurbnonblock(ps, p);
1611                 break;
1612
1613         case USBDEVFS_DISCSIGNAL:
1614                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
1615                 ret = proc_disconnectsignal(ps, p);
1616                 break;
1617
1618         case USBDEVFS_CLAIMINTERFACE:
1619                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
1620                 ret = proc_claiminterface(ps, p);
1621                 break;
1622
1623         case USBDEVFS_RELEASEINTERFACE:
1624                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
1625                 ret = proc_releaseinterface(ps, p);
1626                 break;
1627
1628         case USBDEVFS_IOCTL:
1629                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1630                 ret = proc_ioctl_default(ps, p);
1631                 break;
1632         }
1633         usb_unlock_device(dev);
1634         if (ret >= 0)
1635                 inode->i_atime = CURRENT_TIME;
1636         return ret;
1637 }
1638
1639 /* No kernel lock - fine */
1640 static unsigned int usbdev_poll(struct file *file,
1641                                 struct poll_table_struct *wait)
1642 {
1643         struct dev_state *ps = file->private_data;
1644         unsigned int mask = 0;
1645
1646         poll_wait(file, &ps->wait, wait);
1647         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1648                 mask |= POLLOUT | POLLWRNORM;
1649         if (!connected(ps))
1650                 mask |= POLLERR | POLLHUP;
1651         return mask;
1652 }
1653
1654 const struct file_operations usbdev_file_operations = {
1655         .owner =        THIS_MODULE,
1656         .llseek =       usbdev_lseek,
1657         .read =         usbdev_read,
1658         .poll =         usbdev_poll,
1659         .ioctl =        usbdev_ioctl,
1660         .open =         usbdev_open,
1661         .release =      usbdev_release,
1662 };
1663
1664 #ifdef CONFIG_USB_DEVICE_CLASS
1665 static struct class *usb_classdev_class;
1666
1667 static int usb_classdev_add(struct usb_device *dev)
1668 {
1669         int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1670
1671         dev->usb_classdev = device_create(usb_classdev_class, &dev->dev,
1672                                 MKDEV(USB_DEVICE_MAJOR, minor),
1673                                 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1674         if (IS_ERR(dev->usb_classdev))
1675                 return PTR_ERR(dev->usb_classdev);
1676
1677         return 0;
1678 }
1679
1680 static void usb_classdev_remove(struct usb_device *dev)
1681 {
1682         device_unregister(dev->usb_classdev);
1683 }
1684
1685 static int usb_classdev_notify(struct notifier_block *self,
1686                                unsigned long action, void *dev)
1687 {
1688         switch (action) {
1689         case USB_DEVICE_ADD:
1690                 if (usb_classdev_add(dev))
1691                         return NOTIFY_BAD;
1692                 break;
1693         case USB_DEVICE_REMOVE:
1694                 usb_classdev_remove(dev);
1695                 break;
1696         }
1697         return NOTIFY_OK;
1698 }
1699
1700 static struct notifier_block usbdev_nb = {
1701         .notifier_call =        usb_classdev_notify,
1702 };
1703 #endif
1704
1705 static struct cdev usb_device_cdev;
1706
1707 int __init usb_devio_init(void)
1708 {
1709         int retval;
1710
1711         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1712                                         "usb_device");
1713         if (retval) {
1714                 err("unable to register minors for usb_device");
1715                 goto out;
1716         }
1717         cdev_init(&usb_device_cdev, &usbdev_file_operations);
1718         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1719         if (retval) {
1720                 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1721                 goto error_cdev;
1722         }
1723 #ifdef CONFIG_USB_DEVICE_CLASS
1724         usb_classdev_class = class_create(THIS_MODULE, "usb_device");
1725         if (IS_ERR(usb_classdev_class)) {
1726                 err("unable to register usb_device class");
1727                 retval = PTR_ERR(usb_classdev_class);
1728                 cdev_del(&usb_device_cdev);
1729                 usb_classdev_class = NULL;
1730                 goto out;
1731         }
1732
1733         usb_register_notify(&usbdev_nb);
1734 #endif
1735 out:
1736         return retval;
1737
1738 error_cdev:
1739         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1740         goto out;
1741 }
1742
1743 void usb_devio_cleanup(void)
1744 {
1745 #ifdef CONFIG_USB_DEVICE_CLASS
1746         usb_unregister_notify(&usbdev_nb);
1747         class_destroy(usb_classdev_class);
1748 #endif
1749         cdev_del(&usb_device_cdev);
1750         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1751 }