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