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  *  This file implements the usbfs/x/y files, where
  23  *  x is the bus number and y the device number.
  24  *
  25  *  It allows user space programs/"drivers" to communicate directly
  26  *  with USB devices without intervening kernel driver.
  27  *
  28  *  Revision history
  29  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  30  *    04.01.2000   0.2   Turned into its own filesystem
  31  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  32  *                       (CAN-2005-3055)
  33  */
  34
  35 /*****************************************************************************/
  36
  37 #include <linux/fs.h>
  38 #include <linux/mm.h>
  39 #include <linux/slab.h>
  40 #include <linux/smp_lock.h>
  41 #include <linux/signal.h>
  42 #include <linux/poll.h>
  43 #include <linux/module.h>
  44 #include <linux/usb.h>
  45 #include <linux/usbdevice_fs.h>
  46 #include <linux/cdev.h>
  47 #include <linux/notifier.h>
  48 #include <linux/security.h>
  49 #include <asm/uaccess.h>
  50 #include <asm/byteorder.h>
  51 #include <linux/moduleparam.h>
  52
  53 #include "hcd.h"        /* for usbcore internals */
  54 #include "usb.h"
  55
  56 #define USB_MAXBUS                      64
  57 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
  58
  59 /* Mutual exclusion for removal, open, and release */
  60 DEFINE_MUTEX(usbfs_mutex);
  61
  62 struct dev_state {
  63         struct list_head list;      /* state list */
  64         struct usb_device *dev;
  65         struct file *file;
  66         spinlock_t lock;            /* protects the async urb lists */
  67         struct list_head async_pending;
  68         struct list_head async_completed;
  69         wait_queue_head_t wait;     /* wake up if a request completed */
  70         unsigned int discsignr;
  71         struct pid *disc_pid;
  72         uid_t disc_uid, disc_euid;
  73         void __user *disccontext;
  74         unsigned long ifclaimed;
  75         u32 secid;
  76 };
  77
  78 struct async {
  79         struct list_head asynclist;
  80         struct dev_state *ps;
  81         struct pid *pid;
  82         uid_t uid, euid;
  83         unsigned int signr;
  84         unsigned int ifnum;
  85         void __user *userbuffer;
  86         void __user *userurb;
  87         struct urb *urb;
  88         int status;
  89         u32 secid;
  90 };
  91
  92 static int usbfs_snoop;
  93 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  94 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
  95
  96 #define snoop(dev, format, arg...)                              \
  97         do {                                                    \
  98                 if (usbfs_snoop)                                \
  99                         dev_info(dev , format , ## arg);        \
 100         } while (0)
 101
 102 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 103
 104
 105 #define MAX_USBFS_BUFFER_SIZE   16384
 106
 107 static int connected(struct dev_state *ps)
 108 {
 109         return (!list_empty(&ps->list) &&
 110                         ps->dev->state != USB_STATE_NOTATTACHED);
 111 }
 112
 113 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
 114 {
 115         loff_t ret;
 116
 117         lock_kernel();
 118
 119         switch (orig) {
 120         case 0:
 121                 file->f_pos = offset;
 122                 ret = file->f_pos;
 123                 break;
 124         case 1:
 125                 file->f_pos += offset;
 126                 ret = file->f_pos;
 127                 break;
 128         case 2:
 129         default:
 130                 ret = -EINVAL;
 131         }
 132
 133         unlock_kernel();
 134         return ret;
 135 }
 136
 137 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 138                            loff_t *ppos)
 139 {
 140         struct dev_state *ps = file->private_data;
 141         struct usb_device *dev = ps->dev;
 142         ssize_t ret = 0;
 143         unsigned len;
 144         loff_t pos;
 145         int i;
 146
 147         pos = *ppos;
 148         usb_lock_device(dev);
 149         if (!connected(ps)) {
 150                 ret = -ENODEV;
 151                 goto err;
 152         } else if (pos < 0) {
 153                 ret = -EINVAL;
 154                 goto err;
 155         }
 156
 157         if (pos < sizeof(struct usb_device_descriptor)) {
 158                 /* 18 bytes - fits on the stack */
 159                 struct usb_device_descriptor temp_desc;
 160
 161                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 162                 le16_to_cpus(&temp_desc.bcdUSB);
 163                 le16_to_cpus(&temp_desc.idVendor);
 164                 le16_to_cpus(&temp_desc.idProduct);
 165                 le16_to_cpus(&temp_desc.bcdDevice);
 166
 167                 len = sizeof(struct usb_device_descriptor) - pos;
 168                 if (len > nbytes)
 169                         len = nbytes;
 170                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 171                         ret = -EFAULT;
 172                         goto err;
 173                 }
 174
 175                 *ppos += len;
 176                 buf += len;
 177                 nbytes -= len;
 178                 ret += len;
 179         }
 180
 181         pos = sizeof(struct usb_device_descriptor);
 182         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 183                 struct usb_config_descriptor *config =
 184                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 185                 unsigned int length = le16_to_cpu(config->wTotalLength);
 186
 187                 if (*ppos < pos + length) {
 188
 189                         /* The descriptor may claim to be longer than it
 190                          * really is.  Here is the actual allocated length. */
 191                         unsigned alloclen =
 192                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 193
 194                         len = length - (*ppos - pos);
 195                         if (len > nbytes)
 196                                 len = nbytes;
 197
 198                         /* Simply don't write (skip over) unallocated parts */
 199                         if (alloclen > (*ppos - pos)) {
 200                                 alloclen -= (*ppos - pos);
 201                                 if (copy_to_user(buf,
 202                                     dev->rawdescriptors[i] + (*ppos - pos),
 203                                     min(len, alloclen))) {
 204                                         ret = -EFAULT;
 205                                         goto err;
 206                                 }
 207                         }
 208
 209                         *ppos += len;
 210                         buf += len;
 211                         nbytes -= len;
 212                         ret += len;
 213                 }
 214
 215                 pos += length;
 216         }
 217
 218 err:
 219         usb_unlock_device(dev);
 220         return ret;
 221 }
 222
 223 /*
 224  * async list handling
 225  */
 226
 227 static struct async *alloc_async(unsigned int numisoframes)
 228 {
 229         struct async *as;
 230
 231         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 232         if (!as)
 233                 return NULL;
 234         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 235         if (!as->urb) {
 236                 kfree(as);
 237                 return NULL;
 238         }
 239         return as;
 240 }
 241
 242 static void free_async(struct async *as)
 243 {
 244         put_pid(as->pid);
 245         kfree(as->urb->transfer_buffer);
 246         kfree(as->urb->setup_packet);
 247         usb_free_urb(as->urb);
 248         kfree(as);
 249 }
 250
 251 static void async_newpending(struct async *as)
 252 {
 253         struct dev_state *ps = as->ps;
 254         unsigned long flags;
 255
 256         spin_lock_irqsave(&ps->lock, flags);
 257         list_add_tail(&as->asynclist, &ps->async_pending);
 258         spin_unlock_irqrestore(&ps->lock, flags);
 259 }
 260
 261 static void async_removepending(struct async *as)
 262 {
 263         struct dev_state *ps = as->ps;
 264         unsigned long flags;
 265
 266         spin_lock_irqsave(&ps->lock, flags);
 267         list_del_init(&as->asynclist);
 268         spin_unlock_irqrestore(&ps->lock, flags);
 269 }
 270
 271 static struct async *async_getcompleted(struct dev_state *ps)
 272 {
 273         unsigned long flags;
 274         struct async *as = NULL;
 275
 276         spin_lock_irqsave(&ps->lock, flags);
 277         if (!list_empty(&ps->async_completed)) {
 278                 as = list_entry(ps->async_completed.next, struct async,
 279                                 asynclist);
 280                 list_del_init(&as->asynclist);
 281         }
 282         spin_unlock_irqrestore(&ps->lock, flags);
 283         return as;
 284 }
 285
 286 static struct async *async_getpending(struct dev_state *ps,
 287                                              void __user *userurb)
 288 {
 289         unsigned long flags;
 290         struct async *as;
 291
 292         spin_lock_irqsave(&ps->lock, flags);
 293         list_for_each_entry(as, &ps->async_pending, asynclist)
 294                 if (as->userurb == userurb) {
 295                         list_del_init(&as->asynclist);
 296                         spin_unlock_irqrestore(&ps->lock, flags);
 297                         return as;
 298                 }
 299         spin_unlock_irqrestore(&ps->lock, flags);
 300         return NULL;
 301 }
 302
 303 static void snoop_urb(struct urb *urb, void __user *userurb)
 304 {
 305         unsigned j;
 306         unsigned char *data = urb->transfer_buffer;
 307
 308         if (!usbfs_snoop)
 309                 return;
 310
 311         dev_info(&urb->dev->dev, "direction=%s\n",
 312                         usb_urb_dir_in(urb) ? "IN" : "OUT");
 313         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
 314         dev_info(&urb->dev->dev, "transfer_buffer_length=%u\n",
 315                  urb->transfer_buffer_length);
 316         dev_info(&urb->dev->dev, "actual_length=%u\n", urb->actual_length);
 317         dev_info(&urb->dev->dev, "data: ");
 318         for (j = 0; j < urb->transfer_buffer_length; ++j)
 319                 printk("%02x ", data[j]);
 320         printk("\n");
 321 }
 322
 323 static void async_completed(struct urb *urb)
 324 {
 325         struct async *as = urb->context;
 326         struct dev_state *ps = as->ps;
 327         struct siginfo sinfo;
 328         struct pid *pid = NULL;
 329         uid_t uid = 0;
 330         uid_t euid = 0;
 331         u32 secid = 0;
 332         int signr;
 333
 334         spin_lock(&ps->lock);
 335         list_move_tail(&as->asynclist, &ps->async_completed);
 336         as->status = urb->status;
 337         signr = as->signr;
 338         if (signr) {
 339                 sinfo.si_signo = as->signr;
 340                 sinfo.si_errno = as->status;
 341                 sinfo.si_code = SI_ASYNCIO;
 342                 sinfo.si_addr = as->userurb;
 343                 pid = as->pid;
 344                 uid = as->uid;
 345                 euid = as->euid;
 346                 secid = as->secid;
 347         }
 348         snoop(&urb->dev->dev, "urb complete\n");
 349         snoop_urb(urb, as->userurb);
 350         spin_unlock(&ps->lock);
 351
 352         if (signr)
 353                 kill_pid_info_as_uid(sinfo.si_signo, &sinfo, pid, uid,
 354                                       euid, secid);
 355
 356         wake_up(&ps->wait);
 357 }
 358
 359 static void destroy_async(struct dev_state *ps, struct list_head *list)
 360 {
 361         struct async *as;
 362         unsigned long flags;
 363
 364         spin_lock_irqsave(&ps->lock, flags);
 365         while (!list_empty(list)) {
 366                 as = list_entry(list->next, struct async, asynclist);
 367                 list_del_init(&as->asynclist);
 368
 369                 /* drop the spinlock so the completion handler can run */
 370                 spin_unlock_irqrestore(&ps->lock, flags);
 371                 usb_kill_urb(as->urb);
 372                 spin_lock_irqsave(&ps->lock, flags);
 373         }
 374         spin_unlock_irqrestore(&ps->lock, flags);
 375 }
 376
 377 static void destroy_async_on_interface(struct dev_state *ps,
 378                                        unsigned int ifnum)
 379 {
 380         struct list_head *p, *q, hitlist;
 381         unsigned long flags;
 382
 383         INIT_LIST_HEAD(&hitlist);
 384         spin_lock_irqsave(&ps->lock, flags);
 385         list_for_each_safe(p, q, &ps->async_pending)
 386                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 387                         list_move_tail(p, &hitlist);
 388         spin_unlock_irqrestore(&ps->lock, flags);
 389         destroy_async(ps, &hitlist);
 390 }
 391
 392 static void destroy_all_async(struct dev_state *ps)
 393 {
 394         destroy_async(ps, &ps->async_pending);
 395 }
 396
 397 /*
 398  * interface claims are made only at the request of user level code,
 399  * which can also release them (explicitly or by closing files).
 400  * they're also undone when devices disconnect.
 401  */
 402
 403 static int driver_probe(struct usb_interface *intf,
 404                         const struct usb_device_id *id)
 405 {
 406         return -ENODEV;
 407 }
 408
 409 static void driver_disconnect(struct usb_interface *intf)
 410 {
 411         struct dev_state *ps = usb_get_intfdata(intf);
 412         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 413
 414         if (!ps)
 415                 return;
 416
 417         /* NOTE:  this relies on usbcore having canceled and completed
 418          * all pending I/O requests; 2.6 does that.
 419          */
 420
 421         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 422                 clear_bit(ifnum, &ps->ifclaimed);
 423         else
 424                 dev_warn(&intf->dev, "interface number %u out of range\n",
 425                          ifnum);
 426
 427         usb_set_intfdata(intf, NULL);
 428
 429         /* force async requests to complete */
 430         destroy_async_on_interface(ps, ifnum);
 431 }
 432
 433 /* The following routines are merely placeholders.  There is no way
 434  * to inform a user task about suspend or resumes.
 435  */
 436 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 437 {
 438         return 0;
 439 }
 440
 441 static int driver_resume(struct usb_interface *intf)
 442 {
 443         return 0;
 444 }
 445
 446 struct usb_driver usbfs_driver = {
 447         .name =         "usbfs",
 448         .probe =        driver_probe,
 449         .disconnect =   driver_disconnect,
 450         .suspend =      driver_suspend,
 451         .resume =       driver_resume,
 452 };
 453
 454 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 455 {
 456         struct usb_device *dev = ps->dev;
 457         struct usb_interface *intf;
 458         int err;
 459
 460         if (ifnum >= 8*sizeof(ps->ifclaimed))
 461                 return -EINVAL;
 462         /* already claimed */
 463         if (test_bit(ifnum, &ps->ifclaimed))
 464                 return 0;
 465
 466         intf = usb_ifnum_to_if(dev, ifnum);
 467         if (!intf)
 468                 err = -ENOENT;
 469         else
 470                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 471         if (err == 0)
 472                 set_bit(ifnum, &ps->ifclaimed);
 473         return err;
 474 }
 475
 476 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 477 {
 478         struct usb_device *dev;
 479         struct usb_interface *intf;
 480         int err;
 481
 482         err = -EINVAL;
 483         if (ifnum >= 8*sizeof(ps->ifclaimed))
 484                 return err;
 485         dev = ps->dev;
 486         intf = usb_ifnum_to_if(dev, ifnum);
 487         if (!intf)
 488                 err = -ENOENT;
 489         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 490                 usb_driver_release_interface(&usbfs_driver, intf);
 491                 err = 0;
 492         }
 493         return err;
 494 }
 495
 496 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 497 {
 498         if (ps->dev->state != USB_STATE_CONFIGURED)
 499                 return -EHOSTUNREACH;
 500         if (ifnum >= 8*sizeof(ps->ifclaimed))
 501                 return -EINVAL;
 502         if (test_bit(ifnum, &ps->ifclaimed))
 503                 return 0;
 504         /* if not yet claimed, claim it for the driver */
 505         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 506                  "interface %u before use\n", task_pid_nr(current),
 507                  current->comm, ifnum);
 508         return claimintf(ps, ifnum);
 509 }
 510
 511 static int findintfep(struct usb_device *dev, unsigned int ep)
 512 {
 513         unsigned int i, j, e;
 514         struct usb_interface *intf;
 515         struct usb_host_interface *alts;
 516         struct usb_endpoint_descriptor *endpt;
 517
 518         if (ep & ~(USB_DIR_IN|0xf))
 519                 return -EINVAL;
 520         if (!dev->actconfig)
 521                 return -ESRCH;
 522         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 523                 intf = dev->actconfig->interface[i];
 524                 for (j = 0; j < intf->num_altsetting; j++) {
 525                         alts = &intf->altsetting[j];
 526                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 527                                 endpt = &alts->endpoint[e].desc;
 528                                 if (endpt->bEndpointAddress == ep)
 529                                         return alts->desc.bInterfaceNumber;
 530                         }
 531                 }
 532         }
 533         return -ENOENT;
 534 }
 535
 536 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
 537                            unsigned int index)
 538 {
 539         int ret = 0;
 540
 541         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 542          && ps->dev->state != USB_STATE_ADDRESS
 543          && ps->dev->state != USB_STATE_CONFIGURED)
 544                 return -EHOSTUNREACH;
 545         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 546                 return 0;
 547
 548         index &= 0xff;
 549         switch (requesttype & USB_RECIP_MASK) {
 550         case USB_RECIP_ENDPOINT:
 551                 ret = findintfep(ps->dev, index);
 552                 if (ret >= 0)
 553                         ret = checkintf(ps, ret);
 554                 break;
 555
 556         case USB_RECIP_INTERFACE:
 557                 ret = checkintf(ps, index);
 558                 break;
 559         }
 560         return ret;
 561 }
 562
 563 static int match_devt(struct device *dev, void *data)
 564 {
 565         return dev->devt == (dev_t) (unsigned long) data;
 566 }
 567
 568 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 569 {
 570         struct device *dev;
 571
 572         dev = bus_find_device(&usb_bus_type, NULL,
 573                               (void *) (unsigned long) devt, match_devt);
 574         if (!dev)
 575                 return NULL;
 576         return container_of(dev, struct usb_device, dev);
 577 }
 578
 579 /*
 580  * file operations
 581  */
 582 static int usbdev_open(struct inode *inode, struct file *file)
 583 {
 584         struct usb_device *dev = NULL;
 585         struct dev_state *ps;
 586         const struct cred *cred = current_cred();
 587         int ret;
 588
 589         lock_kernel();
 590         /* Protect against simultaneous removal or release */
 591         mutex_lock(&usbfs_mutex);
 592
 593         ret = -ENOMEM;
 594         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
 595         if (!ps)
 596                 goto out;
 597
 598         ret = -ENOENT;
 599
 600         /* usbdev device-node */
 601         if (imajor(inode) == USB_DEVICE_MAJOR)
 602                 dev = usbdev_lookup_by_devt(inode->i_rdev);
 603 #ifdef CONFIG_USB_DEVICEFS
 604         /* procfs file */
 605         if (!dev) {
 606                 dev = inode->i_private;
 607                 if (dev && dev->usbfs_dentry &&
 608                                         dev->usbfs_dentry->d_inode == inode)
 609                         usb_get_dev(dev);
 610                 else
 611                         dev = NULL;
 612         }
 613 #endif
 614         if (!dev || dev->state == USB_STATE_NOTATTACHED)
 615                 goto out;
 616         ret = usb_autoresume_device(dev);
 617         if (ret)
 618                 goto out;
 619
 620         ret = 0;
 621         ps->dev = dev;
 622         ps->file = file;
 623         spin_lock_init(&ps->lock);
 624         INIT_LIST_HEAD(&ps->list);
 625         INIT_LIST_HEAD(&ps->async_pending);
 626         INIT_LIST_HEAD(&ps->async_completed);
 627         init_waitqueue_head(&ps->wait);
 628         ps->discsignr = 0;
 629         ps->disc_pid = get_pid(task_pid(current));
 630         ps->disc_uid = cred->uid;
 631         ps->disc_euid = cred->euid;
 632         ps->disccontext = NULL;
 633         ps->ifclaimed = 0;
 634         security_task_getsecid(current, &ps->secid);
 635         smp_wmb();
 636         list_add_tail(&ps->list, &dev->filelist);
 637         file->private_data = ps;
 638         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
 639                         current->comm);
 640  out:
 641         if (ret) {
 642                 kfree(ps);
 643                 usb_put_dev(dev);
 644         }
 645         mutex_unlock(&usbfs_mutex);
 646         unlock_kernel();
 647         return ret;
 648 }
 649
 650 static int usbdev_release(struct inode *inode, struct file *file)
 651 {
 652         struct dev_state *ps = file->private_data;
 653         struct usb_device *dev = ps->dev;
 654         unsigned int ifnum;
 655         struct async *as;
 656
 657         usb_lock_device(dev);
 658
 659         /* Protect against simultaneous open */
 660         mutex_lock(&usbfs_mutex);
 661         list_del_init(&ps->list);
 662         mutex_unlock(&usbfs_mutex);
 663
 664         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 665                         ifnum++) {
 666                 if (test_bit(ifnum, &ps->ifclaimed))
 667                         releaseintf(ps, ifnum);
 668         }
 669         destroy_all_async(ps);
 670         usb_autosuspend_device(dev);
 671         usb_unlock_device(dev);
 672         usb_put_dev(dev);
 673         put_pid(ps->disc_pid);
 674
 675         as = async_getcompleted(ps);
 676         while (as) {
 677                 free_async(as);
 678                 as = async_getcompleted(ps);
 679         }
 680         kfree(ps);
 681         return 0;
 682 }
 683
 684 static int proc_control(struct dev_state *ps, void __user *arg)
 685 {
 686         struct usb_device *dev = ps->dev;
 687         struct usbdevfs_ctrltransfer ctrl;
 688         unsigned int tmo;
 689         unsigned char *tbuf;
 690         unsigned wLength;
 691         int i, j, ret;
 692
 693         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 694                 return -EFAULT;
 695         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
 696         if (ret)
 697                 return ret;
 698         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
 699         if (wLength > PAGE_SIZE)
 700                 return -EINVAL;
 701         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
 702         if (!tbuf)
 703                 return -ENOMEM;
 704         tmo = ctrl.timeout;
 705         if (ctrl.bRequestType & 0x80) {
 706                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
 707                                                ctrl.wLength)) {
 708                         free_page((unsigned long)tbuf);
 709                         return -EINVAL;
 710                 }
 711                 snoop(&dev->dev, "control read: bRequest=%02x "
 712                                 "bRrequestType=%02x wValue=%04x "
 713                                 "wIndex=%04x wLength=%04x\n",
 714                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 715                                 ctrl.wIndex, ctrl.wLength);
 716
 717                 usb_unlock_device(dev);
 718                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest,
 719                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 720                                     tbuf, ctrl.wLength, tmo);
 721                 usb_lock_device(dev);
 722                 if ((i > 0) && ctrl.wLength) {
 723                         if (usbfs_snoop) {
 724                                 dev_info(&dev->dev, "control read: data ");
 725                                 for (j = 0; j < i; ++j)
 726                                         printk("%02x ", (u8)(tbuf)[j]);
 727                                 printk("\n");
 728                         }
 729                         if (copy_to_user(ctrl.data, tbuf, i)) {
 730                                 free_page((unsigned long)tbuf);
 731                                 return -EFAULT;
 732                         }
 733                 }
 734         } else {
 735                 if (ctrl.wLength) {
 736                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 737                                 free_page((unsigned long)tbuf);
 738                                 return -EFAULT;
 739                         }
 740                 }
 741                 snoop(&dev->dev, "control write: bRequest=%02x "
 742                                 "bRrequestType=%02x wValue=%04x "
 743                                 "wIndex=%04x wLength=%04x\n",
 744                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 745                                 ctrl.wIndex, ctrl.wLength);
 746                 if (usbfs_snoop) {
 747                         dev_info(&dev->dev, "control write: data: ");
 748                         for (j = 0; j < ctrl.wLength; ++j)
 749                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 750                         printk("\n");
 751                 }
 752                 usb_unlock_device(dev);
 753                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
 754                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 755                                     tbuf, ctrl.wLength, tmo);
 756                 usb_lock_device(dev);
 757         }
 758         free_page((unsigned long)tbuf);
 759         if (i < 0 && i != -EPIPE) {
 760                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 761                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 762                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 763                            ctrl.wLength, i);
 764         }
 765         return i;
 766 }
 767
 768 static int proc_bulk(struct dev_state *ps, void __user *arg)
 769 {
 770         struct usb_device *dev = ps->dev;
 771         struct usbdevfs_bulktransfer bulk;
 772         unsigned int tmo, len1, pipe;
 773         int len2;
 774         unsigned char *tbuf;
 775         int i, j, ret;
 776
 777         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 778                 return -EFAULT;
 779         ret = findintfep(ps->dev, bulk.ep);
 780         if (ret < 0)
 781                 return ret;
 782         ret = checkintf(ps, ret);
 783         if (ret)
 784                 return ret;
 785         if (bulk.ep & USB_DIR_IN)
 786                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 787         else
 788                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 789         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 790                 return -EINVAL;
 791         len1 = bulk.len;
 792         if (len1 > MAX_USBFS_BUFFER_SIZE)
 793                 return -EINVAL;
 794         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 795                 return -ENOMEM;
 796         tmo = bulk.timeout;
 797         if (bulk.ep & 0x80) {
 798                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 799                         kfree(tbuf);
 800                         return -EINVAL;
 801                 }
 802                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
 803                         bulk.len, bulk.timeout);
 804                 usb_unlock_device(dev);
 805                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 806                 usb_lock_device(dev);
 807                 if (!i && len2) {
 808                         if (usbfs_snoop) {
 809                                 dev_info(&dev->dev, "bulk read: data ");
 810                                 for (j = 0; j < len2; ++j)
 811                                         printk("%02x ", (u8)(tbuf)[j]);
 812                                 printk("\n");
 813                         }
 814                         if (copy_to_user(bulk.data, tbuf, len2)) {
 815                                 kfree(tbuf);
 816                                 return -EFAULT;
 817                         }
 818                 }
 819         } else {
 820                 if (len1) {
 821                         if (copy_from_user(tbuf, bulk.data, len1)) {
 822                                 kfree(tbuf);
 823                                 return -EFAULT;
 824                         }
 825                 }
 826                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
 827                         bulk.len, bulk.timeout);
 828                 if (usbfs_snoop) {
 829                         dev_info(&dev->dev, "bulk write: data: ");
 830                         for (j = 0; j < len1; ++j)
 831                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 832                         printk("\n");
 833                 }
 834                 usb_unlock_device(dev);
 835                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 836                 usb_lock_device(dev);
 837         }
 838         kfree(tbuf);
 839         if (i < 0)
 840                 return i;
 841         return len2;
 842 }
 843
 844 static int proc_resetep(struct dev_state *ps, void __user *arg)
 845 {
 846         unsigned int ep;
 847         int ret;
 848
 849         if (get_user(ep, (unsigned int __user *)arg))
 850                 return -EFAULT;
 851         ret = findintfep(ps->dev, ep);
 852         if (ret < 0)
 853                 return ret;
 854         ret = checkintf(ps, ret);
 855         if (ret)
 856                 return ret;
 857         usb_reset_endpoint(ps->dev, ep);
 858         return 0;
 859 }
 860
 861 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 862 {
 863         unsigned int ep;
 864         int pipe;
 865         int ret;
 866
 867         if (get_user(ep, (unsigned int __user *)arg))
 868                 return -EFAULT;
 869         ret = findintfep(ps->dev, ep);
 870         if (ret < 0)
 871                 return ret;
 872         ret = checkintf(ps, ret);
 873         if (ret)
 874                 return ret;
 875         if (ep & USB_DIR_IN)
 876                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 877         else
 878                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 879
 880         return usb_clear_halt(ps->dev, pipe);
 881 }
 882
 883 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 884 {
 885         struct usbdevfs_getdriver gd;
 886         struct usb_interface *intf;
 887         int ret;
 888
 889         if (copy_from_user(&gd, arg, sizeof(gd)))
 890                 return -EFAULT;
 891         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 892         if (!intf || !intf->dev.driver)
 893                 ret = -ENODATA;
 894         else {
 895                 strncpy(gd.driver, intf->dev.driver->name,
 896                                 sizeof(gd.driver));
 897                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 898         }
 899         return ret;
 900 }
 901
 902 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 903 {
 904         struct usbdevfs_connectinfo ci;
 905
 906         ci.devnum = ps->dev->devnum;
 907         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 908         if (copy_to_user(arg, &ci, sizeof(ci)))
 909                 return -EFAULT;
 910         return 0;
 911 }
 912
 913 static int proc_resetdevice(struct dev_state *ps)
 914 {
 915         return usb_reset_device(ps->dev);
 916 }
 917
 918 static int proc_setintf(struct dev_state *ps, void __user *arg)
 919 {
 920         struct usbdevfs_setinterface setintf;
 921         int ret;
 922
 923         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 924                 return -EFAULT;
 925         if ((ret = checkintf(ps, setintf.interface)))
 926                 return ret;
 927         return usb_set_interface(ps->dev, setintf.interface,
 928                         setintf.altsetting);
 929 }
 930
 931 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 932 {
 933         int u;
 934         int status = 0;
 935         struct usb_host_config *actconfig;
 936
 937         if (get_user(u, (int __user *)arg))
 938                 return -EFAULT;
 939
 940         actconfig = ps->dev->actconfig;
 941
 942         /* Don't touch the device if any interfaces are claimed.
 943          * It could interfere with other drivers' operations, and if
 944          * an interface is claimed by usbfs it could easily deadlock.
 945          */
 946         if (actconfig) {
 947                 int i;
 948
 949                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 950                         if (usb_interface_claimed(actconfig->interface[i])) {
 951                                 dev_warn(&ps->dev->dev,
 952                                         "usbfs: interface %d claimed by %s "
 953                                         "while '%s' sets config #%d\n",
 954                                         actconfig->interface[i]
 955                                                 ->cur_altsetting
 956                                                 ->desc.bInterfaceNumber,
 957                                         actconfig->interface[i]
 958                                                 ->dev.driver->name,
 959                                         current->comm, u);
 960                                 status = -EBUSY;
 961                                 break;
 962                         }
 963                 }
 964         }
 965
 966         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 967          * so avoid usb_set_configuration()'s kick to sysfs
 968          */
 969         if (status == 0) {
 970                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 971                         status = usb_reset_configuration(ps->dev);
 972                 else
 973                         status = usb_set_configuration(ps->dev, u);
 974         }
 975
 976         return status;
 977 }
 978
 979 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 980                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
 981                         void __user *arg)
 982 {
 983         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 984         struct usb_host_endpoint *ep;
 985         struct async *as;
 986         struct usb_ctrlrequest *dr = NULL;
 987         const struct cred *cred = current_cred();
 988         unsigned int u, totlen, isofrmlen;
 989         int ret, ifnum = -1;
 990         int is_in;
 991
 992         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
 993                                 USBDEVFS_URB_SHORT_NOT_OK |
 994                                 USBDEVFS_URB_NO_FSBR |
 995                                 USBDEVFS_URB_ZERO_PACKET |
 996                                 USBDEVFS_URB_NO_INTERRUPT))
 997                 return -EINVAL;
 998         if (uurb->buffer_length > 0 && !uurb->buffer)
 999                 return -EINVAL;
1000         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1001             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1002                 ifnum = findintfep(ps->dev, uurb->endpoint);
1003                 if (ifnum < 0)
1004                         return ifnum;
1005                 ret = checkintf(ps, ifnum);
1006                 if (ret)
1007                         return ret;
1008         }
1009         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1010                 is_in = 1;
1011                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1012         } else {
1013                 is_in = 0;
1014                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1015         }
1016         if (!ep)
1017                 return -ENOENT;
1018         switch(uurb->type) {
1019         case USBDEVFS_URB_TYPE_CONTROL:
1020                 if (!usb_endpoint_xfer_control(&ep->desc))
1021                         return -EINVAL;
1022                 /* min 8 byte setup packet,
1023                  * max 8 byte setup plus an arbitrary data stage */
1024                 if (uurb->buffer_length < 8 ||
1025                     uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1026                         return -EINVAL;
1027                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1028                 if (!dr)
1029                         return -ENOMEM;
1030                 if (copy_from_user(dr, uurb->buffer, 8)) {
1031                         kfree(dr);
1032                         return -EFAULT;
1033                 }
1034                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1035                         kfree(dr);
1036                         return -EINVAL;
1037                 }
1038                 ret = check_ctrlrecip(ps, dr->bRequestType,
1039                                       le16_to_cpup(&dr->wIndex));
1040                 if (ret) {
1041                         kfree(dr);
1042                         return ret;
1043                 }
1044                 uurb->number_of_packets = 0;
1045                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1046                 uurb->buffer += 8;
1047                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1048                         is_in = 1;
1049                         uurb->endpoint |= USB_DIR_IN;
1050                 } else {
1051                         is_in = 0;
1052                         uurb->endpoint &= ~USB_DIR_IN;
1053                 }
1054                 snoop(&ps->dev->dev, "control urb: bRequest=%02x "
1055                         "bRrequestType=%02x wValue=%04x "
1056                         "wIndex=%04x wLength=%04x\n",
1057                         dr->bRequest, dr->bRequestType,
1058                         __le16_to_cpup(&dr->wValue),
1059                         __le16_to_cpup(&dr->wIndex),
1060                         __le16_to_cpup(&dr->wLength));
1061                 break;
1062
1063         case USBDEVFS_URB_TYPE_BULK:
1064                 switch (usb_endpoint_type(&ep->desc)) {
1065                 case USB_ENDPOINT_XFER_CONTROL:
1066                 case USB_ENDPOINT_XFER_ISOC:
1067                         return -EINVAL;
1068                 /* allow single-shot interrupt transfers, at bogus rates */
1069                 }
1070                 uurb->number_of_packets = 0;
1071                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1072                         return -EINVAL;
1073                 snoop(&ps->dev->dev, "bulk urb\n");
1074                 break;
1075
1076         case USBDEVFS_URB_TYPE_ISO:
1077                 /* arbitrary limit */
1078                 if (uurb->number_of_packets < 1 ||
1079                     uurb->number_of_packets > 128)
1080                         return -EINVAL;
1081                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1082                         return -EINVAL;
1083                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1084                                    uurb->number_of_packets;
1085                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1086                         return -ENOMEM;
1087                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1088                         kfree(isopkt);
1089                         return -EFAULT;
1090                 }
1091                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1092                         /* arbitrary limit,
1093                          * sufficient for USB 2.0 high-bandwidth iso */
1094                         if (isopkt[u].length > 8192) {
1095                                 kfree(isopkt);
1096                                 return -EINVAL;
1097                         }
1098                         totlen += isopkt[u].length;
1099                 }
1100                 if (totlen > 32768) {
1101                         kfree(isopkt);
1102                         return -EINVAL;
1103                 }
1104                 uurb->buffer_length = totlen;
1105                 snoop(&ps->dev->dev, "iso urb\n");
1106                 break;
1107
1108         case USBDEVFS_URB_TYPE_INTERRUPT:
1109                 uurb->number_of_packets = 0;
1110                 if (!usb_endpoint_xfer_int(&ep->desc))
1111                         return -EINVAL;
1112                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1113                         return -EINVAL;
1114                 snoop(&ps->dev->dev, "interrupt urb\n");
1115                 break;
1116
1117         default:
1118                 return -EINVAL;
1119         }
1120         if (uurb->buffer_length > 0 &&
1121                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1122                                 uurb->buffer, uurb->buffer_length)) {
1123                 kfree(isopkt);
1124                 kfree(dr);
1125                 return -EFAULT;
1126         }
1127         as = alloc_async(uurb->number_of_packets);
1128         if (!as) {
1129                 kfree(isopkt);
1130                 kfree(dr);
1131                 return -ENOMEM;
1132         }
1133         if (uurb->buffer_length > 0) {
1134                 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1135                                 GFP_KERNEL);
1136                 if (!as->urb->transfer_buffer) {
1137                         kfree(isopkt);
1138                         kfree(dr);
1139                         free_async(as);
1140                         return -ENOMEM;
1141                 }
1142         }
1143         as->urb->dev = ps->dev;
1144         as->urb->pipe = (uurb->type << 30) |
1145                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1146                         (uurb->endpoint & USB_DIR_IN);
1147
1148         /* This tedious sequence is necessary because the URB_* flags
1149          * are internal to the kernel and subject to change, whereas
1150          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1151          */
1152         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1153         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1154                 u |= URB_ISO_ASAP;
1155         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1156                 u |= URB_SHORT_NOT_OK;
1157         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1158                 u |= URB_NO_FSBR;
1159         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1160                 u |= URB_ZERO_PACKET;
1161         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1162                 u |= URB_NO_INTERRUPT;
1163         as->urb->transfer_flags = u;
1164
1165         as->urb->transfer_buffer_length = uurb->buffer_length;
1166         as->urb->setup_packet = (unsigned char *)dr;
1167         as->urb->start_frame = uurb->start_frame;
1168         as->urb->number_of_packets = uurb->number_of_packets;
1169         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1170                         ps->dev->speed == USB_SPEED_HIGH)
1171                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1172         else
1173                 as->urb->interval = ep->desc.bInterval;
1174         as->urb->context = as;
1175         as->urb->complete = async_completed;
1176         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1177                 as->urb->iso_frame_desc[u].offset = totlen;
1178                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1179                 totlen += isopkt[u].length;
1180         }
1181         kfree(isopkt);
1182         as->ps = ps;
1183         as->userurb = arg;
1184         if (is_in && uurb->buffer_length > 0)
1185                 as->userbuffer = uurb->buffer;
1186         else
1187                 as->userbuffer = NULL;
1188         as->signr = uurb->signr;
1189         as->ifnum = ifnum;
1190         as->pid = get_pid(task_pid(current));
1191         as->uid = cred->uid;
1192         as->euid = cred->euid;
1193         security_task_getsecid(current, &as->secid);
1194         if (!is_in && uurb->buffer_length > 0) {
1195                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1196                                 uurb->buffer_length)) {
1197                         free_async(as);
1198                         return -EFAULT;
1199                 }
1200         }
1201         snoop_urb(as->urb, as->userurb);
1202         async_newpending(as);
1203         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1204                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1205                            "usbfs: usb_submit_urb returned %d\n", ret);
1206                 async_removepending(as);
1207                 free_async(as);
1208                 return ret;
1209         }
1210         return 0;
1211 }
1212
1213 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1214 {
1215         struct usbdevfs_urb uurb;
1216
1217         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1218                 return -EFAULT;
1219
1220         return proc_do_submiturb(ps, &uurb,
1221                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1222                         arg);
1223 }
1224
1225 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1226 {
1227         struct async *as;
1228
1229         as = async_getpending(ps, arg);
1230         if (!as)
1231                 return -EINVAL;
1232         usb_kill_urb(as->urb);
1233         return 0;
1234 }
1235
1236 static int processcompl(struct async *as, void __user * __user *arg)
1237 {
1238         struct urb *urb = as->urb;
1239         struct usbdevfs_urb __user *userurb = as->userurb;
1240         void __user *addr = as->userurb;
1241         unsigned int i;
1242
1243         if (as->userbuffer)
1244                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1245                                  urb->transfer_buffer_length))
1246                         goto err_out;
1247         if (put_user(as->status, &userurb->status))
1248                 goto err_out;
1249         if (put_user(urb->actual_length, &userurb->actual_length))
1250                 goto err_out;
1251         if (put_user(urb->error_count, &userurb->error_count))
1252                 goto err_out;
1253
1254         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1255                 for (i = 0; i < urb->number_of_packets; i++) {
1256                         if (put_user(urb->iso_frame_desc[i].actual_length,
1257                                      &userurb->iso_frame_desc[i].actual_length))
1258                                 goto err_out;
1259                         if (put_user(urb->iso_frame_desc[i].status,
1260                                      &userurb->iso_frame_desc[i].status))
1261                                 goto err_out;
1262                 }
1263         }
1264
1265         free_async(as);
1266
1267         if (put_user(addr, (void __user * __user *)arg))
1268                 return -EFAULT;
1269         return 0;
1270
1271 err_out:
1272         free_async(as);
1273         return -EFAULT;
1274 }
1275
1276 static struct async *reap_as(struct dev_state *ps)
1277 {
1278         DECLARE_WAITQUEUE(wait, current);
1279         struct async *as = NULL;
1280         struct usb_device *dev = ps->dev;
1281
1282         add_wait_queue(&ps->wait, &wait);
1283         for (;;) {
1284                 __set_current_state(TASK_INTERRUPTIBLE);
1285                 as = async_getcompleted(ps);
1286                 if (as)
1287                         break;
1288                 if (signal_pending(current))
1289                         break;
1290                 usb_unlock_device(dev);
1291                 schedule();
1292                 usb_lock_device(dev);
1293         }
1294         remove_wait_queue(&ps->wait, &wait);
1295         set_current_state(TASK_RUNNING);
1296         return as;
1297 }
1298
1299 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1300 {
1301         struct async *as = reap_as(ps);
1302         if (as)
1303                 return processcompl(as, (void __user * __user *)arg);
1304         if (signal_pending(current))
1305                 return -EINTR;
1306         return -EIO;
1307 }
1308
1309 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1310 {
1311         struct async *as;
1312
1313         if (!(as = async_getcompleted(ps)))
1314                 return -EAGAIN;
1315         return processcompl(as, (void __user * __user *)arg);
1316 }
1317
1318 #ifdef CONFIG_COMPAT
1319
1320 static int get_urb32(struct usbdevfs_urb *kurb,
1321                      struct usbdevfs_urb32 __user *uurb)
1322 {
1323         __u32  uptr;
1324         if (get_user(kurb->type, &uurb->type) ||
1325             __get_user(kurb->endpoint, &uurb->endpoint) ||
1326             __get_user(kurb->status, &uurb->status) ||
1327             __get_user(kurb->flags, &uurb->flags) ||
1328             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1329             __get_user(kurb->actual_length, &uurb->actual_length) ||
1330             __get_user(kurb->start_frame, &uurb->start_frame) ||
1331             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1332             __get_user(kurb->error_count, &uurb->error_count) ||
1333             __get_user(kurb->signr, &uurb->signr))
1334                 return -EFAULT;
1335
1336         if (__get_user(uptr, &uurb->buffer))
1337                 return -EFAULT;
1338         kurb->buffer = compat_ptr(uptr);
1339         if (__get_user(uptr, &uurb->usercontext))
1340                 return -EFAULT;
1341         kurb->usercontext = compat_ptr(uptr);
1342
1343         return 0;
1344 }
1345
1346 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1347 {
1348         struct usbdevfs_urb uurb;
1349
1350         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1351                 return -EFAULT;
1352
1353         return proc_do_submiturb(ps, &uurb,
1354                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1355                         arg);
1356 }
1357
1358 static int processcompl_compat(struct async *as, void __user * __user *arg)
1359 {
1360         struct urb *urb = as->urb;
1361         struct usbdevfs_urb32 __user *userurb = as->userurb;
1362         void __user *addr = as->userurb;
1363         unsigned int i;
1364
1365         if (as->userbuffer)
1366                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1367                                  urb->transfer_buffer_length))
1368                         return -EFAULT;
1369         if (put_user(as->status, &userurb->status))
1370                 return -EFAULT;
1371         if (put_user(urb->actual_length, &userurb->actual_length))
1372                 return -EFAULT;
1373         if (put_user(urb->error_count, &userurb->error_count))
1374                 return -EFAULT;
1375
1376         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1377                 for (i = 0; i < urb->number_of_packets; i++) {
1378                         if (put_user(urb->iso_frame_desc[i].actual_length,
1379                                      &userurb->iso_frame_desc[i].actual_length))
1380                                 return -EFAULT;
1381                         if (put_user(urb->iso_frame_desc[i].status,
1382                                      &userurb->iso_frame_desc[i].status))
1383                                 return -EFAULT;
1384                 }
1385         }
1386
1387         free_async(as);
1388         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1389                 return -EFAULT;
1390         return 0;
1391 }
1392
1393 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1394 {
1395         struct async *as = reap_as(ps);
1396         if (as)
1397                 return processcompl_compat(as, (void __user * __user *)arg);
1398         if (signal_pending(current))
1399                 return -EINTR;
1400         return -EIO;
1401 }
1402
1403 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1404 {
1405         struct async *as;
1406
1407         if (!(as = async_getcompleted(ps)))
1408                 return -EAGAIN;
1409         return processcompl_compat(as, (void __user * __user *)arg);
1410 }
1411
1412 #endif
1413
1414 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1415 {
1416         struct usbdevfs_disconnectsignal ds;
1417
1418         if (copy_from_user(&ds, arg, sizeof(ds)))
1419                 return -EFAULT;
1420         ps->discsignr = ds.signr;
1421         ps->disccontext = ds.context;
1422         return 0;
1423 }
1424
1425 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1426 {
1427         unsigned int ifnum;
1428
1429         if (get_user(ifnum, (unsigned int __user *)arg))
1430                 return -EFAULT;
1431         return claimintf(ps, ifnum);
1432 }
1433
1434 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1435 {
1436         unsigned int ifnum;
1437         int ret;
1438
1439         if (get_user(ifnum, (unsigned int __user *)arg))
1440                 return -EFAULT;
1441         if ((ret = releaseintf(ps, ifnum)) < 0)
1442                 return ret;
1443         destroy_async_on_interface (ps, ifnum);
1444         return 0;
1445 }
1446
1447 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1448 {
1449         int                     size;
1450         void                    *buf = NULL;
1451         int                     retval = 0;
1452         struct usb_interface    *intf = NULL;
1453         struct usb_driver       *driver = NULL;
1454
1455         /* alloc buffer */
1456         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1457                 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1458                         return -ENOMEM;
1459                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1460                         if (copy_from_user(buf, ctl->data, size)) {
1461                                 kfree(buf);
1462                                 return -EFAULT;
1463                         }
1464                 } else {
1465                         memset(buf, 0, size);
1466                 }
1467         }
1468
1469         if (!connected(ps)) {
1470                 kfree(buf);
1471                 return -ENODEV;
1472         }
1473
1474         if (ps->dev->state != USB_STATE_CONFIGURED)
1475                 retval = -EHOSTUNREACH;
1476         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1477                 retval = -EINVAL;
1478         else switch (ctl->ioctl_code) {
1479
1480         /* disconnect kernel driver from interface */
1481         case USBDEVFS_DISCONNECT:
1482                 if (intf->dev.driver) {
1483                         driver = to_usb_driver(intf->dev.driver);
1484                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1485                         usb_driver_release_interface(driver, intf);
1486                 } else
1487                         retval = -ENODATA;
1488                 break;
1489
1490         /* let kernel drivers try to (re)bind to the interface */
1491         case USBDEVFS_CONNECT:
1492                 if (!intf->dev.driver)
1493                         retval = device_attach(&intf->dev);
1494                 else
1495                         retval = -EBUSY;
1496                 break;
1497
1498         /* talk directly to the interface's driver */
1499         default:
1500                 if (intf->dev.driver)
1501                         driver = to_usb_driver(intf->dev.driver);
1502                 if (driver == NULL || driver->ioctl == NULL) {
1503                         retval = -ENOTTY;
1504                 } else {
1505                         retval = driver->ioctl(intf, ctl->ioctl_code, buf);
1506                         if (retval == -ENOIOCTLCMD)
1507                                 retval = -ENOTTY;
1508                 }
1509         }
1510
1511         /* cleanup and return */
1512         if (retval >= 0
1513                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1514                         && size > 0
1515                         && copy_to_user(ctl->data, buf, size) != 0)
1516                 retval = -EFAULT;
1517
1518         kfree(buf);
1519         return retval;
1520 }
1521
1522 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1523 {
1524         struct usbdevfs_ioctl   ctrl;
1525
1526         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1527                 return -EFAULT;
1528         return proc_ioctl(ps, &ctrl);
1529 }
1530
1531 #ifdef CONFIG_COMPAT
1532 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1533 {
1534         struct usbdevfs_ioctl32 __user *uioc;
1535         struct usbdevfs_ioctl ctrl;
1536         u32 udata;
1537
1538         uioc = compat_ptr((long)arg);
1539         if (get_user(ctrl.ifno, &uioc->ifno) ||
1540             get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1541             __get_user(udata, &uioc->data))
1542                 return -EFAULT;
1543         ctrl.data = compat_ptr(udata);
1544
1545         return proc_ioctl(ps, &ctrl);
1546 }
1547 #endif
1548
1549 /*
1550  * NOTE:  All requests here that have interface numbers as parameters
1551  * are assuming that somehow the configuration has been prevented from
1552  * changing.  But there's no mechanism to ensure that...
1553  */
1554 static int usbdev_ioctl(struct inode *inode, struct file *file,
1555                         unsigned int cmd, unsigned long arg)
1556 {
1557         struct dev_state *ps = file->private_data;
1558         struct usb_device *dev = ps->dev;
1559         void __user *p = (void __user *)arg;
1560         int ret = -ENOTTY;
1561
1562         if (!(file->f_mode & FMODE_WRITE))
1563                 return -EPERM;
1564         usb_lock_device(dev);
1565         if (!connected(ps)) {
1566                 usb_unlock_device(dev);
1567                 return -ENODEV;
1568         }
1569
1570         switch (cmd) {
1571         case USBDEVFS_CONTROL:
1572                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1573                 ret = proc_control(ps, p);
1574                 if (ret >= 0)
1575                         inode->i_mtime = CURRENT_TIME;
1576                 break;
1577
1578         case USBDEVFS_BULK:
1579                 snoop(&dev->dev, "%s: BULK\n", __func__);
1580                 ret = proc_bulk(ps, p);
1581                 if (ret >= 0)
1582                         inode->i_mtime = CURRENT_TIME;
1583                 break;
1584
1585         case USBDEVFS_RESETEP:
1586                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1587                 ret = proc_resetep(ps, p);
1588                 if (ret >= 0)
1589                         inode->i_mtime = CURRENT_TIME;
1590                 break;
1591
1592         case USBDEVFS_RESET:
1593                 snoop(&dev->dev, "%s: RESET\n", __func__);
1594                 ret = proc_resetdevice(ps);
1595                 break;
1596
1597         case USBDEVFS_CLEAR_HALT:
1598                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1599                 ret = proc_clearhalt(ps, p);
1600                 if (ret >= 0)
1601                         inode->i_mtime = CURRENT_TIME;
1602                 break;
1603
1604         case USBDEVFS_GETDRIVER:
1605                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1606                 ret = proc_getdriver(ps, p);
1607                 break;
1608
1609         case USBDEVFS_CONNECTINFO:
1610                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1611                 ret = proc_connectinfo(ps, p);
1612                 break;
1613
1614         case USBDEVFS_SETINTERFACE:
1615                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1616                 ret = proc_setintf(ps, p);
1617                 break;
1618
1619         case USBDEVFS_SETCONFIGURATION:
1620                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1621                 ret = proc_setconfig(ps, p);
1622                 break;
1623
1624         case USBDEVFS_SUBMITURB:
1625                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1626                 ret = proc_submiturb(ps, p);
1627                 if (ret >= 0)
1628                         inode->i_mtime = CURRENT_TIME;
1629                 break;
1630
1631 #ifdef CONFIG_COMPAT
1632
1633         case USBDEVFS_SUBMITURB32:
1634                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1635                 ret = proc_submiturb_compat(ps, p);
1636                 if (ret >= 0)
1637                         inode->i_mtime = CURRENT_TIME;
1638                 break;
1639
1640         case USBDEVFS_REAPURB32:
1641                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1642                 ret = proc_reapurb_compat(ps, p);
1643                 break;
1644
1645         case USBDEVFS_REAPURBNDELAY32:
1646                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __func__);
1647                 ret = proc_reapurbnonblock_compat(ps, p);
1648                 break;
1649
1650         case USBDEVFS_IOCTL32:
1651                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1652                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1653                 break;
1654 #endif
1655
1656         case USBDEVFS_DISCARDURB:
1657                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1658                 ret = proc_unlinkurb(ps, p);
1659                 break;
1660
1661         case USBDEVFS_REAPURB:
1662                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1663                 ret = proc_reapurb(ps, p);
1664                 break;
1665
1666         case USBDEVFS_REAPURBNDELAY:
1667                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __func__);
1668                 ret = proc_reapurbnonblock(ps, p);
1669                 break;
1670
1671         case USBDEVFS_DISCSIGNAL:
1672                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1673                 ret = proc_disconnectsignal(ps, p);
1674                 break;
1675
1676         case USBDEVFS_CLAIMINTERFACE:
1677                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1678                 ret = proc_claiminterface(ps, p);
1679                 break;
1680
1681         case USBDEVFS_RELEASEINTERFACE:
1682                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1683                 ret = proc_releaseinterface(ps, p);
1684                 break;
1685
1686         case USBDEVFS_IOCTL:
1687                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1688                 ret = proc_ioctl_default(ps, p);
1689                 break;
1690         }
1691         usb_unlock_device(dev);
1692         if (ret >= 0)
1693                 inode->i_atime = CURRENT_TIME;
1694         return ret;
1695 }
1696
1697 /* No kernel lock - fine */
1698 static unsigned int usbdev_poll(struct file *file,
1699                                 struct poll_table_struct *wait)
1700 {
1701         struct dev_state *ps = file->private_data;
1702         unsigned int mask = 0;
1703
1704         poll_wait(file, &ps->wait, wait);
1705         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1706                 mask |= POLLOUT | POLLWRNORM;
1707         if (!connected(ps))
1708                 mask |= POLLERR | POLLHUP;
1709         return mask;
1710 }
1711
1712 const struct file_operations usbdev_file_operations = {
1713         .owner =        THIS_MODULE,
1714         .llseek =       usbdev_lseek,
1715         .read =         usbdev_read,
1716         .poll =         usbdev_poll,
1717         .ioctl =        usbdev_ioctl,
1718         .open =         usbdev_open,
1719         .release =      usbdev_release,
1720 };
1721
1722 static void usbdev_remove(struct usb_device *udev)
1723 {
1724         struct dev_state *ps;
1725         struct siginfo sinfo;
1726
1727         while (!list_empty(&udev->filelist)) {
1728                 ps = list_entry(udev->filelist.next, struct dev_state, list);
1729                 destroy_all_async(ps);
1730                 wake_up_all(&ps->wait);
1731                 list_del_init(&ps->list);
1732                 if (ps->discsignr) {
1733                         sinfo.si_signo = ps->discsignr;
1734                         sinfo.si_errno = EPIPE;
1735                         sinfo.si_code = SI_ASYNCIO;
1736                         sinfo.si_addr = ps->disccontext;
1737                         kill_pid_info_as_uid(ps->discsignr, &sinfo,
1738                                         ps->disc_pid, ps->disc_uid,
1739                                         ps->disc_euid, ps->secid);
1740                 }
1741         }
1742 }
1743
1744 #ifdef CONFIG_USB_DEVICE_CLASS
1745 static struct class *usb_classdev_class;
1746
1747 static int usb_classdev_add(struct usb_device *dev)
1748 {
1749         struct device *cldev;
1750
1751         cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
1752                               NULL, "usbdev%d.%d", dev->bus->busnum,
1753                               dev->devnum);
1754         if (IS_ERR(cldev))
1755                 return PTR_ERR(cldev);
1756         dev->usb_classdev = cldev;
1757         return 0;
1758 }
1759
1760 static void usb_classdev_remove(struct usb_device *dev)
1761 {
1762         if (dev->usb_classdev)
1763                 device_unregister(dev->usb_classdev);
1764 }
1765
1766 #else
1767 #define usb_classdev_add(dev)           0
1768 #define usb_classdev_remove(dev)        do {} while (0)
1769
1770 #endif
1771
1772 static int usbdev_notify(struct notifier_block *self,
1773                                unsigned long action, void *dev)
1774 {
1775         switch (action) {
1776         case USB_DEVICE_ADD:
1777                 if (usb_classdev_add(dev))
1778                         return NOTIFY_BAD;
1779                 break;
1780         case USB_DEVICE_REMOVE:
1781                 usb_classdev_remove(dev);
1782                 usbdev_remove(dev);
1783                 break;
1784         }
1785         return NOTIFY_OK;
1786 }
1787
1788 static struct notifier_block usbdev_nb = {
1789         .notifier_call =        usbdev_notify,
1790 };
1791
1792 static struct cdev usb_device_cdev;
1793
1794 int __init usb_devio_init(void)
1795 {
1796         int retval;
1797
1798         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1799                                         "usb_device");
1800         if (retval) {
1801                 printk(KERN_ERR "Unable to register minors for usb_device\n");
1802                 goto out;
1803         }
1804         cdev_init(&usb_device_cdev, &usbdev_file_operations);
1805         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1806         if (retval) {
1807                 printk(KERN_ERR "Unable to get usb_device major %d\n",
1808                        USB_DEVICE_MAJOR);
1809                 goto error_cdev;
1810         }
1811 #ifdef CONFIG_USB_DEVICE_CLASS
1812         usb_classdev_class = class_create(THIS_MODULE, "usb_device");
1813         if (IS_ERR(usb_classdev_class)) {
1814                 printk(KERN_ERR "Unable to register usb_device class\n");
1815                 retval = PTR_ERR(usb_classdev_class);
1816                 cdev_del(&usb_device_cdev);
1817                 usb_classdev_class = NULL;
1818                 goto out;
1819         }
1820         /* devices of this class shadow the major:minor of their parent
1821          * device, so clear ->dev_kobj to prevent adding duplicate entries
1822          * to /sys/dev
1823          */
1824         usb_classdev_class->dev_kobj = NULL;
1825 #endif
1826         usb_register_notify(&usbdev_nb);
1827 out:
1828         return retval;
1829
1830 error_cdev:
1831         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1832         goto out;
1833 }
1834
1835 void usb_devio_cleanup(void)
1836 {
1837         usb_unregister_notify(&usbdev_nb);
1838 #ifdef CONFIG_USB_DEVICE_CLASS
1839         class_destroy(usb_classdev_class);
1840 #endif
1841         cdev_del(&usb_device_cdev);
1842         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1843 }