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 #include "hub.h"
  56
  57 #define USB_MAXBUS                      64
  58 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
  59
  60 /* Mutual exclusion for removal, open, and release */
  61 DEFINE_MUTEX(usbfs_mutex);
  62
  63 struct dev_state {
  64         struct list_head list;      /* state list */
  65         struct usb_device *dev;
  66         struct file *file;
  67         spinlock_t lock;            /* protects the async urb lists */
  68         struct list_head async_pending;
  69         struct list_head async_completed;
  70         wait_queue_head_t wait;     /* wake up if a request completed */
  71         unsigned int discsignr;
  72         struct pid *disc_pid;
  73         uid_t disc_uid, disc_euid;
  74         void __user *disccontext;
  75         unsigned long ifclaimed;
  76         u32 secid;
  77 };
  78
  79 struct async {
  80         struct list_head asynclist;
  81         struct dev_state *ps;
  82         struct pid *pid;
  83         uid_t uid, euid;
  84         unsigned int signr;
  85         unsigned int ifnum;
  86         void __user *userbuffer;
  87         void __user *userurb;
  88         struct urb *urb;
  89         int status;
  90         u32 secid;
  91 };
  92
  93 static int usbfs_snoop;
  94 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  95 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
  96
  97 #define snoop(dev, format, arg...)                              \
  98         do {                                                    \
  99                 if (usbfs_snoop)                                \
 100                         dev_info(dev , format , ## arg);        \
 101         } while (0)
 102
 103 enum snoop_when {
 104         SUBMIT, COMPLETE
 105 };
 106
 107 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 108
 109 #define MAX_USBFS_BUFFER_SIZE   16384
 110
 111
 112 static int connected(struct dev_state *ps)
 113 {
 114         return (!list_empty(&ps->list) &&
 115                         ps->dev->state != USB_STATE_NOTATTACHED);
 116 }
 117
 118 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
 119 {
 120         loff_t ret;
 121
 122         lock_kernel();
 123
 124         switch (orig) {
 125         case 0:
 126                 file->f_pos = offset;
 127                 ret = file->f_pos;
 128                 break;
 129         case 1:
 130                 file->f_pos += offset;
 131                 ret = file->f_pos;
 132                 break;
 133         case 2:
 134         default:
 135                 ret = -EINVAL;
 136         }
 137
 138         unlock_kernel();
 139         return ret;
 140 }
 141
 142 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 143                            loff_t *ppos)
 144 {
 145         struct dev_state *ps = file->private_data;
 146         struct usb_device *dev = ps->dev;
 147         ssize_t ret = 0;
 148         unsigned len;
 149         loff_t pos;
 150         int i;
 151
 152         pos = *ppos;
 153         usb_lock_device(dev);
 154         if (!connected(ps)) {
 155                 ret = -ENODEV;
 156                 goto err;
 157         } else if (pos < 0) {
 158                 ret = -EINVAL;
 159                 goto err;
 160         }
 161
 162         if (pos < sizeof(struct usb_device_descriptor)) {
 163                 /* 18 bytes - fits on the stack */
 164                 struct usb_device_descriptor temp_desc;
 165
 166                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 167                 le16_to_cpus(&temp_desc.bcdUSB);
 168                 le16_to_cpus(&temp_desc.idVendor);
 169                 le16_to_cpus(&temp_desc.idProduct);
 170                 le16_to_cpus(&temp_desc.bcdDevice);
 171
 172                 len = sizeof(struct usb_device_descriptor) - pos;
 173                 if (len > nbytes)
 174                         len = nbytes;
 175                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 176                         ret = -EFAULT;
 177                         goto err;
 178                 }
 179
 180                 *ppos += len;
 181                 buf += len;
 182                 nbytes -= len;
 183                 ret += len;
 184         }
 185
 186         pos = sizeof(struct usb_device_descriptor);
 187         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 188                 struct usb_config_descriptor *config =
 189                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 190                 unsigned int length = le16_to_cpu(config->wTotalLength);
 191
 192                 if (*ppos < pos + length) {
 193
 194                         /* The descriptor may claim to be longer than it
 195                          * really is.  Here is the actual allocated length. */
 196                         unsigned alloclen =
 197                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 198
 199                         len = length - (*ppos - pos);
 200                         if (len > nbytes)
 201                                 len = nbytes;
 202
 203                         /* Simply don't write (skip over) unallocated parts */
 204                         if (alloclen > (*ppos - pos)) {
 205                                 alloclen -= (*ppos - pos);
 206                                 if (copy_to_user(buf,
 207                                     dev->rawdescriptors[i] + (*ppos - pos),
 208                                     min(len, alloclen))) {
 209                                         ret = -EFAULT;
 210                                         goto err;
 211                                 }
 212                         }
 213
 214                         *ppos += len;
 215                         buf += len;
 216                         nbytes -= len;
 217                         ret += len;
 218                 }
 219
 220                 pos += length;
 221         }
 222
 223 err:
 224         usb_unlock_device(dev);
 225         return ret;
 226 }
 227
 228 /*
 229  * async list handling
 230  */
 231
 232 static struct async *alloc_async(unsigned int numisoframes)
 233 {
 234         struct async *as;
 235
 236         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 237         if (!as)
 238                 return NULL;
 239         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 240         if (!as->urb) {
 241                 kfree(as);
 242                 return NULL;
 243         }
 244         return as;
 245 }
 246
 247 static void free_async(struct async *as)
 248 {
 249         put_pid(as->pid);
 250         kfree(as->urb->transfer_buffer);
 251         kfree(as->urb->setup_packet);
 252         usb_free_urb(as->urb);
 253         kfree(as);
 254 }
 255
 256 static void async_newpending(struct async *as)
 257 {
 258         struct dev_state *ps = as->ps;
 259         unsigned long flags;
 260
 261         spin_lock_irqsave(&ps->lock, flags);
 262         list_add_tail(&as->asynclist, &ps->async_pending);
 263         spin_unlock_irqrestore(&ps->lock, flags);
 264 }
 265
 266 static void async_removepending(struct async *as)
 267 {
 268         struct dev_state *ps = as->ps;
 269         unsigned long flags;
 270
 271         spin_lock_irqsave(&ps->lock, flags);
 272         list_del_init(&as->asynclist);
 273         spin_unlock_irqrestore(&ps->lock, flags);
 274 }
 275
 276 static struct async *async_getcompleted(struct dev_state *ps)
 277 {
 278         unsigned long flags;
 279         struct async *as = NULL;
 280
 281         spin_lock_irqsave(&ps->lock, flags);
 282         if (!list_empty(&ps->async_completed)) {
 283                 as = list_entry(ps->async_completed.next, struct async,
 284                                 asynclist);
 285                 list_del_init(&as->asynclist);
 286         }
 287         spin_unlock_irqrestore(&ps->lock, flags);
 288         return as;
 289 }
 290
 291 static struct async *async_getpending(struct dev_state *ps,
 292                                              void __user *userurb)
 293 {
 294         unsigned long flags;
 295         struct async *as;
 296
 297         spin_lock_irqsave(&ps->lock, flags);
 298         list_for_each_entry(as, &ps->async_pending, asynclist)
 299                 if (as->userurb == userurb) {
 300                         list_del_init(&as->asynclist);
 301                         spin_unlock_irqrestore(&ps->lock, flags);
 302                         return as;
 303                 }
 304         spin_unlock_irqrestore(&ps->lock, flags);
 305         return NULL;
 306 }
 307
 308 static void snoop_urb(struct usb_device *udev,
 309                 void __user *userurb, int pipe, unsigned length,
 310                 int timeout_or_status, enum snoop_when when)
 311 {
 312         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 313         static const char *dirs[] = {"out", "in"};
 314         int ep;
 315         const char *t, *d;
 316
 317         if (!usbfs_snoop)
 318                 return;
 319
 320         ep = usb_pipeendpoint(pipe);
 321         t = types[usb_pipetype(pipe)];
 322         d = dirs[!!usb_pipein(pipe)];
 323
 324         if (userurb) {          /* Async */
 325                 if (when == SUBMIT)
 326                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 327                                         "length %u\n",
 328                                         userurb, ep, t, d, length);
 329                 else
 330                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 331                                         "actual_length %u status %d\n",
 332                                         userurb, ep, t, d, length,
 333                                         timeout_or_status);
 334         } else {
 335                 if (when == SUBMIT)
 336                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 337                                         "timeout %d\n",
 338                                         ep, t, d, length, timeout_or_status);
 339                 else
 340                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 341                                         "status %d\n",
 342                                         ep, t, d, length, timeout_or_status);
 343         }
 344 }
 345
 346 static void async_completed(struct urb *urb)
 347 {
 348         struct async *as = urb->context;
 349         struct dev_state *ps = as->ps;
 350         struct siginfo sinfo;
 351         struct pid *pid = NULL;
 352         uid_t uid = 0;
 353         uid_t euid = 0;
 354         u32 secid = 0;
 355         int signr;
 356
 357         spin_lock(&ps->lock);
 358         list_move_tail(&as->asynclist, &ps->async_completed);
 359         as->status = urb->status;
 360         signr = as->signr;
 361         if (signr) {
 362                 sinfo.si_signo = as->signr;
 363                 sinfo.si_errno = as->status;
 364                 sinfo.si_code = SI_ASYNCIO;
 365                 sinfo.si_addr = as->userurb;
 366                 pid = as->pid;
 367                 uid = as->uid;
 368                 euid = as->euid;
 369                 secid = as->secid;
 370         }
 371         snoop(&urb->dev->dev, "urb complete\n");
 372         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 373                         as->status, COMPLETE);
 374         spin_unlock(&ps->lock);
 375
 376         if (signr)
 377                 kill_pid_info_as_uid(sinfo.si_signo, &sinfo, pid, uid,
 378                                       euid, secid);
 379
 380         wake_up(&ps->wait);
 381 }
 382
 383 static void destroy_async(struct dev_state *ps, struct list_head *list)
 384 {
 385         struct async *as;
 386         unsigned long flags;
 387
 388         spin_lock_irqsave(&ps->lock, flags);
 389         while (!list_empty(list)) {
 390                 as = list_entry(list->next, struct async, asynclist);
 391                 list_del_init(&as->asynclist);
 392
 393                 /* drop the spinlock so the completion handler can run */
 394                 spin_unlock_irqrestore(&ps->lock, flags);
 395                 usb_kill_urb(as->urb);
 396                 spin_lock_irqsave(&ps->lock, flags);
 397         }
 398         spin_unlock_irqrestore(&ps->lock, flags);
 399 }
 400
 401 static void destroy_async_on_interface(struct dev_state *ps,
 402                                        unsigned int ifnum)
 403 {
 404         struct list_head *p, *q, hitlist;
 405         unsigned long flags;
 406
 407         INIT_LIST_HEAD(&hitlist);
 408         spin_lock_irqsave(&ps->lock, flags);
 409         list_for_each_safe(p, q, &ps->async_pending)
 410                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 411                         list_move_tail(p, &hitlist);
 412         spin_unlock_irqrestore(&ps->lock, flags);
 413         destroy_async(ps, &hitlist);
 414 }
 415
 416 static void destroy_all_async(struct dev_state *ps)
 417 {
 418         destroy_async(ps, &ps->async_pending);
 419 }
 420
 421 /*
 422  * interface claims are made only at the request of user level code,
 423  * which can also release them (explicitly or by closing files).
 424  * they're also undone when devices disconnect.
 425  */
 426
 427 static int driver_probe(struct usb_interface *intf,
 428                         const struct usb_device_id *id)
 429 {
 430         return -ENODEV;
 431 }
 432
 433 static void driver_disconnect(struct usb_interface *intf)
 434 {
 435         struct dev_state *ps = usb_get_intfdata(intf);
 436         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 437
 438         if (!ps)
 439                 return;
 440
 441         /* NOTE:  this relies on usbcore having canceled and completed
 442          * all pending I/O requests; 2.6 does that.
 443          */
 444
 445         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 446                 clear_bit(ifnum, &ps->ifclaimed);
 447         else
 448                 dev_warn(&intf->dev, "interface number %u out of range\n",
 449                          ifnum);
 450
 451         usb_set_intfdata(intf, NULL);
 452
 453         /* force async requests to complete */
 454         destroy_async_on_interface(ps, ifnum);
 455 }
 456
 457 /* The following routines are merely placeholders.  There is no way
 458  * to inform a user task about suspend or resumes.
 459  */
 460 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 461 {
 462         return 0;
 463 }
 464
 465 static int driver_resume(struct usb_interface *intf)
 466 {
 467         return 0;
 468 }
 469
 470 struct usb_driver usbfs_driver = {
 471         .name =         "usbfs",
 472         .probe =        driver_probe,
 473         .disconnect =   driver_disconnect,
 474         .suspend =      driver_suspend,
 475         .resume =       driver_resume,
 476 };
 477
 478 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 479 {
 480         struct usb_device *dev = ps->dev;
 481         struct usb_interface *intf;
 482         int err;
 483
 484         if (ifnum >= 8*sizeof(ps->ifclaimed))
 485                 return -EINVAL;
 486         /* already claimed */
 487         if (test_bit(ifnum, &ps->ifclaimed))
 488                 return 0;
 489
 490         intf = usb_ifnum_to_if(dev, ifnum);
 491         if (!intf)
 492                 err = -ENOENT;
 493         else
 494                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 495         if (err == 0)
 496                 set_bit(ifnum, &ps->ifclaimed);
 497         return err;
 498 }
 499
 500 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 501 {
 502         struct usb_device *dev;
 503         struct usb_interface *intf;
 504         int err;
 505
 506         err = -EINVAL;
 507         if (ifnum >= 8*sizeof(ps->ifclaimed))
 508                 return err;
 509         dev = ps->dev;
 510         intf = usb_ifnum_to_if(dev, ifnum);
 511         if (!intf)
 512                 err = -ENOENT;
 513         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 514                 usb_driver_release_interface(&usbfs_driver, intf);
 515                 err = 0;
 516         }
 517         return err;
 518 }
 519
 520 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 521 {
 522         if (ps->dev->state != USB_STATE_CONFIGURED)
 523                 return -EHOSTUNREACH;
 524         if (ifnum >= 8*sizeof(ps->ifclaimed))
 525                 return -EINVAL;
 526         if (test_bit(ifnum, &ps->ifclaimed))
 527                 return 0;
 528         /* if not yet claimed, claim it for the driver */
 529         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 530                  "interface %u before use\n", task_pid_nr(current),
 531                  current->comm, ifnum);
 532         return claimintf(ps, ifnum);
 533 }
 534
 535 static int findintfep(struct usb_device *dev, unsigned int ep)
 536 {
 537         unsigned int i, j, e;
 538         struct usb_interface *intf;
 539         struct usb_host_interface *alts;
 540         struct usb_endpoint_descriptor *endpt;
 541
 542         if (ep & ~(USB_DIR_IN|0xf))
 543                 return -EINVAL;
 544         if (!dev->actconfig)
 545                 return -ESRCH;
 546         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 547                 intf = dev->actconfig->interface[i];
 548                 for (j = 0; j < intf->num_altsetting; j++) {
 549                         alts = &intf->altsetting[j];
 550                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 551                                 endpt = &alts->endpoint[e].desc;
 552                                 if (endpt->bEndpointAddress == ep)
 553                                         return alts->desc.bInterfaceNumber;
 554                         }
 555                 }
 556         }
 557         return -ENOENT;
 558 }
 559
 560 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
 561                            unsigned int index)
 562 {
 563         int ret = 0;
 564
 565         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 566          && ps->dev->state != USB_STATE_ADDRESS
 567          && ps->dev->state != USB_STATE_CONFIGURED)
 568                 return -EHOSTUNREACH;
 569         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 570                 return 0;
 571
 572         index &= 0xff;
 573         switch (requesttype & USB_RECIP_MASK) {
 574         case USB_RECIP_ENDPOINT:
 575                 ret = findintfep(ps->dev, index);
 576                 if (ret >= 0)
 577                         ret = checkintf(ps, ret);
 578                 break;
 579
 580         case USB_RECIP_INTERFACE:
 581                 ret = checkintf(ps, index);
 582                 break;
 583         }
 584         return ret;
 585 }
 586
 587 static int match_devt(struct device *dev, void *data)
 588 {
 589         return dev->devt == (dev_t) (unsigned long) data;
 590 }
 591
 592 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 593 {
 594         struct device *dev;
 595
 596         dev = bus_find_device(&usb_bus_type, NULL,
 597                               (void *) (unsigned long) devt, match_devt);
 598         if (!dev)
 599                 return NULL;
 600         return container_of(dev, struct usb_device, dev);
 601 }
 602
 603 /*
 604  * file operations
 605  */
 606 static int usbdev_open(struct inode *inode, struct file *file)
 607 {
 608         struct usb_device *dev = NULL;
 609         struct dev_state *ps;
 610         const struct cred *cred = current_cred();
 611         int ret;
 612
 613         lock_kernel();
 614         /* Protect against simultaneous removal or release */
 615         mutex_lock(&usbfs_mutex);
 616
 617         ret = -ENOMEM;
 618         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
 619         if (!ps)
 620                 goto out;
 621
 622         ret = -ENODEV;
 623
 624         /* usbdev device-node */
 625         if (imajor(inode) == USB_DEVICE_MAJOR)
 626                 dev = usbdev_lookup_by_devt(inode->i_rdev);
 627 #ifdef CONFIG_USB_DEVICEFS
 628         /* procfs file */
 629         if (!dev) {
 630                 dev = inode->i_private;
 631                 if (dev && dev->usbfs_dentry &&
 632                                         dev->usbfs_dentry->d_inode == inode)
 633                         usb_get_dev(dev);
 634                 else
 635                         dev = NULL;
 636         }
 637 #endif
 638         if (!dev || dev->state == USB_STATE_NOTATTACHED)
 639                 goto out;
 640         ret = usb_autoresume_device(dev);
 641         if (ret)
 642                 goto out;
 643
 644         ret = 0;
 645         ps->dev = dev;
 646         ps->file = file;
 647         spin_lock_init(&ps->lock);
 648         INIT_LIST_HEAD(&ps->list);
 649         INIT_LIST_HEAD(&ps->async_pending);
 650         INIT_LIST_HEAD(&ps->async_completed);
 651         init_waitqueue_head(&ps->wait);
 652         ps->discsignr = 0;
 653         ps->disc_pid = get_pid(task_pid(current));
 654         ps->disc_uid = cred->uid;
 655         ps->disc_euid = cred->euid;
 656         ps->disccontext = NULL;
 657         ps->ifclaimed = 0;
 658         security_task_getsecid(current, &ps->secid);
 659         smp_wmb();
 660         list_add_tail(&ps->list, &dev->filelist);
 661         file->private_data = ps;
 662         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
 663                         current->comm);
 664  out:
 665         if (ret) {
 666                 kfree(ps);
 667                 usb_put_dev(dev);
 668         }
 669         mutex_unlock(&usbfs_mutex);
 670         unlock_kernel();
 671         return ret;
 672 }
 673
 674 static int usbdev_release(struct inode *inode, struct file *file)
 675 {
 676         struct dev_state *ps = file->private_data;
 677         struct usb_device *dev = ps->dev;
 678         unsigned int ifnum;
 679         struct async *as;
 680
 681         usb_lock_device(dev);
 682         usb_hub_release_all_ports(dev, ps);
 683
 684         /* Protect against simultaneous open */
 685         mutex_lock(&usbfs_mutex);
 686         list_del_init(&ps->list);
 687         mutex_unlock(&usbfs_mutex);
 688
 689         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 690                         ifnum++) {
 691                 if (test_bit(ifnum, &ps->ifclaimed))
 692                         releaseintf(ps, ifnum);
 693         }
 694         destroy_all_async(ps);
 695         usb_autosuspend_device(dev);
 696         usb_unlock_device(dev);
 697         usb_put_dev(dev);
 698         put_pid(ps->disc_pid);
 699
 700         as = async_getcompleted(ps);
 701         while (as) {
 702                 free_async(as);
 703                 as = async_getcompleted(ps);
 704         }
 705         kfree(ps);
 706         return 0;
 707 }
 708
 709 static int proc_control(struct dev_state *ps, void __user *arg)
 710 {
 711         struct usb_device *dev = ps->dev;
 712         struct usbdevfs_ctrltransfer ctrl;
 713         unsigned int tmo;
 714         unsigned char *tbuf;
 715         unsigned wLength;
 716         int i, pipe, ret;
 717
 718         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 719                 return -EFAULT;
 720         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
 721         if (ret)
 722                 return ret;
 723         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
 724         if (wLength > PAGE_SIZE)
 725                 return -EINVAL;
 726         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
 727         if (!tbuf)
 728                 return -ENOMEM;
 729         tmo = ctrl.timeout;
 730         if (ctrl.bRequestType & 0x80) {
 731                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
 732                                                ctrl.wLength)) {
 733                         free_page((unsigned long)tbuf);
 734                         return -EINVAL;
 735                 }
 736                 pipe = usb_rcvctrlpipe(dev, 0);
 737                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT);
 738
 739                 usb_unlock_device(dev);
 740                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
 741                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 742                                     tbuf, ctrl.wLength, tmo);
 743                 usb_lock_device(dev);
 744                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE);
 745
 746                 if ((i > 0) && ctrl.wLength) {
 747                         if (copy_to_user(ctrl.data, tbuf, i)) {
 748                                 free_page((unsigned long)tbuf);
 749                                 return -EFAULT;
 750                         }
 751                 }
 752         } else {
 753                 if (ctrl.wLength) {
 754                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 755                                 free_page((unsigned long)tbuf);
 756                                 return -EFAULT;
 757                         }
 758                 }
 759                 pipe = usb_sndctrlpipe(dev, 0);
 760                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT);
 761
 762                 usb_unlock_device(dev);
 763                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
 764                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 765                                     tbuf, ctrl.wLength, tmo);
 766                 usb_lock_device(dev);
 767                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE);
 768         }
 769         free_page((unsigned long)tbuf);
 770         if (i < 0 && i != -EPIPE) {
 771                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 772                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 773                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 774                            ctrl.wLength, i);
 775         }
 776         return i;
 777 }
 778
 779 static int proc_bulk(struct dev_state *ps, void __user *arg)
 780 {
 781         struct usb_device *dev = ps->dev;
 782         struct usbdevfs_bulktransfer bulk;
 783         unsigned int tmo, len1, pipe;
 784         int len2;
 785         unsigned char *tbuf;
 786         int i, ret;
 787
 788         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 789                 return -EFAULT;
 790         ret = findintfep(ps->dev, bulk.ep);
 791         if (ret < 0)
 792                 return ret;
 793         ret = checkintf(ps, ret);
 794         if (ret)
 795                 return ret;
 796         if (bulk.ep & USB_DIR_IN)
 797                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 798         else
 799                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 800         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 801                 return -EINVAL;
 802         len1 = bulk.len;
 803         if (len1 > MAX_USBFS_BUFFER_SIZE)
 804                 return -EINVAL;
 805         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 806                 return -ENOMEM;
 807         tmo = bulk.timeout;
 808         if (bulk.ep & 0x80) {
 809                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 810                         kfree(tbuf);
 811                         return -EINVAL;
 812                 }
 813                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT);
 814
 815                 usb_unlock_device(dev);
 816                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 817                 usb_lock_device(dev);
 818                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE);
 819
 820                 if (!i && len2) {
 821                         if (copy_to_user(bulk.data, tbuf, len2)) {
 822                                 kfree(tbuf);
 823                                 return -EFAULT;
 824                         }
 825                 }
 826         } else {
 827                 if (len1) {
 828                         if (copy_from_user(tbuf, bulk.data, len1)) {
 829                                 kfree(tbuf);
 830                                 return -EFAULT;
 831                         }
 832                 }
 833                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT);
 834
 835                 usb_unlock_device(dev);
 836                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 837                 usb_lock_device(dev);
 838                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE);
 839         }
 840         kfree(tbuf);
 841         if (i < 0)
 842                 return i;
 843         return len2;
 844 }
 845
 846 static int proc_resetep(struct dev_state *ps, void __user *arg)
 847 {
 848         unsigned int ep;
 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         usb_reset_endpoint(ps->dev, ep);
 860         return 0;
 861 }
 862
 863 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 864 {
 865         unsigned int ep;
 866         int pipe;
 867         int ret;
 868
 869         if (get_user(ep, (unsigned int __user *)arg))
 870                 return -EFAULT;
 871         ret = findintfep(ps->dev, ep);
 872         if (ret < 0)
 873                 return ret;
 874         ret = checkintf(ps, ret);
 875         if (ret)
 876                 return ret;
 877         if (ep & USB_DIR_IN)
 878                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 879         else
 880                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 881
 882         return usb_clear_halt(ps->dev, pipe);
 883 }
 884
 885 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 886 {
 887         struct usbdevfs_getdriver gd;
 888         struct usb_interface *intf;
 889         int ret;
 890
 891         if (copy_from_user(&gd, arg, sizeof(gd)))
 892                 return -EFAULT;
 893         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 894         if (!intf || !intf->dev.driver)
 895                 ret = -ENODATA;
 896         else {
 897                 strncpy(gd.driver, intf->dev.driver->name,
 898                                 sizeof(gd.driver));
 899                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 900         }
 901         return ret;
 902 }
 903
 904 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 905 {
 906         struct usbdevfs_connectinfo ci;
 907
 908         ci.devnum = ps->dev->devnum;
 909         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 910         if (copy_to_user(arg, &ci, sizeof(ci)))
 911                 return -EFAULT;
 912         return 0;
 913 }
 914
 915 static int proc_resetdevice(struct dev_state *ps)
 916 {
 917         return usb_reset_device(ps->dev);
 918 }
 919
 920 static int proc_setintf(struct dev_state *ps, void __user *arg)
 921 {
 922         struct usbdevfs_setinterface setintf;
 923         int ret;
 924
 925         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 926                 return -EFAULT;
 927         if ((ret = checkintf(ps, setintf.interface)))
 928                 return ret;
 929         return usb_set_interface(ps->dev, setintf.interface,
 930                         setintf.altsetting);
 931 }
 932
 933 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 934 {
 935         int u;
 936         int status = 0;
 937         struct usb_host_config *actconfig;
 938
 939         if (get_user(u, (int __user *)arg))
 940                 return -EFAULT;
 941
 942         actconfig = ps->dev->actconfig;
 943
 944         /* Don't touch the device if any interfaces are claimed.
 945          * It could interfere with other drivers' operations, and if
 946          * an interface is claimed by usbfs it could easily deadlock.
 947          */
 948         if (actconfig) {
 949                 int i;
 950
 951                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 952                         if (usb_interface_claimed(actconfig->interface[i])) {
 953                                 dev_warn(&ps->dev->dev,
 954                                         "usbfs: interface %d claimed by %s "
 955                                         "while '%s' sets config #%d\n",
 956                                         actconfig->interface[i]
 957                                                 ->cur_altsetting
 958                                                 ->desc.bInterfaceNumber,
 959                                         actconfig->interface[i]
 960                                                 ->dev.driver->name,
 961                                         current->comm, u);
 962                                 status = -EBUSY;
 963                                 break;
 964                         }
 965                 }
 966         }
 967
 968         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 969          * so avoid usb_set_configuration()'s kick to sysfs
 970          */
 971         if (status == 0) {
 972                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 973                         status = usb_reset_configuration(ps->dev);
 974                 else
 975                         status = usb_set_configuration(ps->dev, u);
 976         }
 977
 978         return status;
 979 }
 980
 981 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 982                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
 983                         void __user *arg)
 984 {
 985         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 986         struct usb_host_endpoint *ep;
 987         struct async *as;
 988         struct usb_ctrlrequest *dr = NULL;
 989         const struct cred *cred = current_cred();
 990         unsigned int u, totlen, isofrmlen;
 991         int ret, ifnum = -1;
 992         int is_in;
 993
 994         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
 995                                 USBDEVFS_URB_SHORT_NOT_OK |
 996                                 USBDEVFS_URB_NO_FSBR |
 997                                 USBDEVFS_URB_ZERO_PACKET |
 998                                 USBDEVFS_URB_NO_INTERRUPT))
 999                 return -EINVAL;
1000         if (uurb->buffer_length > 0 && !uurb->buffer)
1001                 return -EINVAL;
1002         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1003             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1004                 ifnum = findintfep(ps->dev, uurb->endpoint);
1005                 if (ifnum < 0)
1006                         return ifnum;
1007                 ret = checkintf(ps, ifnum);
1008                 if (ret)
1009                         return ret;
1010         }
1011         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1012                 is_in = 1;
1013                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1014         } else {
1015                 is_in = 0;
1016                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1017         }
1018         if (!ep)
1019                 return -ENOENT;
1020         switch(uurb->type) {
1021         case USBDEVFS_URB_TYPE_CONTROL:
1022                 if (!usb_endpoint_xfer_control(&ep->desc))
1023                         return -EINVAL;
1024                 /* min 8 byte setup packet,
1025                  * max 8 byte setup plus an arbitrary data stage */
1026                 if (uurb->buffer_length < 8 ||
1027                     uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1028                         return -EINVAL;
1029                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1030                 if (!dr)
1031                         return -ENOMEM;
1032                 if (copy_from_user(dr, uurb->buffer, 8)) {
1033                         kfree(dr);
1034                         return -EFAULT;
1035                 }
1036                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1037                         kfree(dr);
1038                         return -EINVAL;
1039                 }
1040                 ret = check_ctrlrecip(ps, dr->bRequestType,
1041                                       le16_to_cpup(&dr->wIndex));
1042                 if (ret) {
1043                         kfree(dr);
1044                         return ret;
1045                 }
1046                 uurb->number_of_packets = 0;
1047                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1048                 uurb->buffer += 8;
1049                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1050                         is_in = 1;
1051                         uurb->endpoint |= USB_DIR_IN;
1052                 } else {
1053                         is_in = 0;
1054                         uurb->endpoint &= ~USB_DIR_IN;
1055                 }
1056                 break;
1057
1058         case USBDEVFS_URB_TYPE_BULK:
1059                 switch (usb_endpoint_type(&ep->desc)) {
1060                 case USB_ENDPOINT_XFER_CONTROL:
1061                 case USB_ENDPOINT_XFER_ISOC:
1062                         return -EINVAL;
1063                 /* allow single-shot interrupt transfers, at bogus rates */
1064                 }
1065                 uurb->number_of_packets = 0;
1066                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1067                         return -EINVAL;
1068                 break;
1069
1070         case USBDEVFS_URB_TYPE_ISO:
1071                 /* arbitrary limit */
1072                 if (uurb->number_of_packets < 1 ||
1073                     uurb->number_of_packets > 128)
1074                         return -EINVAL;
1075                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1076                         return -EINVAL;
1077                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1078                                    uurb->number_of_packets;
1079                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1080                         return -ENOMEM;
1081                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1082                         kfree(isopkt);
1083                         return -EFAULT;
1084                 }
1085                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1086                         /* arbitrary limit,
1087                          * sufficient for USB 2.0 high-bandwidth iso */
1088                         if (isopkt[u].length > 8192) {
1089                                 kfree(isopkt);
1090                                 return -EINVAL;
1091                         }
1092                         totlen += isopkt[u].length;
1093                 }
1094                 /* 3072 * 64 microframes */
1095                 if (totlen > 196608) {
1096                         kfree(isopkt);
1097                         return -EINVAL;
1098                 }
1099                 uurb->buffer_length = totlen;
1100                 break;
1101
1102         case USBDEVFS_URB_TYPE_INTERRUPT:
1103                 uurb->number_of_packets = 0;
1104                 if (!usb_endpoint_xfer_int(&ep->desc))
1105                         return -EINVAL;
1106                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1107                         return -EINVAL;
1108                 break;
1109
1110         default:
1111                 return -EINVAL;
1112         }
1113         if (uurb->buffer_length > 0 &&
1114                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1115                                 uurb->buffer, uurb->buffer_length)) {
1116                 kfree(isopkt);
1117                 kfree(dr);
1118                 return -EFAULT;
1119         }
1120         as = alloc_async(uurb->number_of_packets);
1121         if (!as) {
1122                 kfree(isopkt);
1123                 kfree(dr);
1124                 return -ENOMEM;
1125         }
1126         if (uurb->buffer_length > 0) {
1127                 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1128                                 GFP_KERNEL);
1129                 if (!as->urb->transfer_buffer) {
1130                         kfree(isopkt);
1131                         kfree(dr);
1132                         free_async(as);
1133                         return -ENOMEM;
1134                 }
1135         }
1136         as->urb->dev = ps->dev;
1137         as->urb->pipe = (uurb->type << 30) |
1138                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1139                         (uurb->endpoint & USB_DIR_IN);
1140
1141         /* This tedious sequence is necessary because the URB_* flags
1142          * are internal to the kernel and subject to change, whereas
1143          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1144          */
1145         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1146         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1147                 u |= URB_ISO_ASAP;
1148         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1149                 u |= URB_SHORT_NOT_OK;
1150         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1151                 u |= URB_NO_FSBR;
1152         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1153                 u |= URB_ZERO_PACKET;
1154         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1155                 u |= URB_NO_INTERRUPT;
1156         as->urb->transfer_flags = u;
1157
1158         as->urb->transfer_buffer_length = uurb->buffer_length;
1159         as->urb->setup_packet = (unsigned char *)dr;
1160         as->urb->start_frame = uurb->start_frame;
1161         as->urb->number_of_packets = uurb->number_of_packets;
1162         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1163                         ps->dev->speed == USB_SPEED_HIGH)
1164                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1165         else
1166                 as->urb->interval = ep->desc.bInterval;
1167         as->urb->context = as;
1168         as->urb->complete = async_completed;
1169         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1170                 as->urb->iso_frame_desc[u].offset = totlen;
1171                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1172                 totlen += isopkt[u].length;
1173         }
1174         kfree(isopkt);
1175         as->ps = ps;
1176         as->userurb = arg;
1177         if (is_in && uurb->buffer_length > 0)
1178                 as->userbuffer = uurb->buffer;
1179         else
1180                 as->userbuffer = NULL;
1181         as->signr = uurb->signr;
1182         as->ifnum = ifnum;
1183         as->pid = get_pid(task_pid(current));
1184         as->uid = cred->uid;
1185         as->euid = cred->euid;
1186         security_task_getsecid(current, &as->secid);
1187         if (!is_in && uurb->buffer_length > 0) {
1188                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1189                                 uurb->buffer_length)) {
1190                         free_async(as);
1191                         return -EFAULT;
1192                 }
1193         }
1194         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1195                         as->urb->transfer_buffer_length, 0, SUBMIT);
1196         async_newpending(as);
1197         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1198                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1199                            "usbfs: usb_submit_urb returned %d\n", ret);
1200                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1201                                 0, ret, COMPLETE);
1202                 async_removepending(as);
1203                 free_async(as);
1204                 return ret;
1205         }
1206         return 0;
1207 }
1208
1209 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1210 {
1211         struct usbdevfs_urb uurb;
1212
1213         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1214                 return -EFAULT;
1215
1216         return proc_do_submiturb(ps, &uurb,
1217                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1218                         arg);
1219 }
1220
1221 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1222 {
1223         struct async *as;
1224
1225         as = async_getpending(ps, arg);
1226         if (!as)
1227                 return -EINVAL;
1228         usb_kill_urb(as->urb);
1229         return 0;
1230 }
1231
1232 static int processcompl(struct async *as, void __user * __user *arg)
1233 {
1234         struct urb *urb = as->urb;
1235         struct usbdevfs_urb __user *userurb = as->userurb;
1236         void __user *addr = as->userurb;
1237         unsigned int i;
1238
1239         if (as->userbuffer)
1240                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1241                                  urb->transfer_buffer_length))
1242                         goto err_out;
1243         if (put_user(as->status, &userurb->status))
1244                 goto err_out;
1245         if (put_user(urb->actual_length, &userurb->actual_length))
1246                 goto err_out;
1247         if (put_user(urb->error_count, &userurb->error_count))
1248                 goto err_out;
1249
1250         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1251                 for (i = 0; i < urb->number_of_packets; i++) {
1252                         if (put_user(urb->iso_frame_desc[i].actual_length,
1253                                      &userurb->iso_frame_desc[i].actual_length))
1254                                 goto err_out;
1255                         if (put_user(urb->iso_frame_desc[i].status,
1256                                      &userurb->iso_frame_desc[i].status))
1257                                 goto err_out;
1258                 }
1259         }
1260
1261         free_async(as);
1262
1263         if (put_user(addr, (void __user * __user *)arg))
1264                 return -EFAULT;
1265         return 0;
1266
1267 err_out:
1268         free_async(as);
1269         return -EFAULT;
1270 }
1271
1272 static struct async *reap_as(struct dev_state *ps)
1273 {
1274         DECLARE_WAITQUEUE(wait, current);
1275         struct async *as = NULL;
1276         struct usb_device *dev = ps->dev;
1277
1278         add_wait_queue(&ps->wait, &wait);
1279         for (;;) {
1280                 __set_current_state(TASK_INTERRUPTIBLE);
1281                 as = async_getcompleted(ps);
1282                 if (as)
1283                         break;
1284                 if (signal_pending(current))
1285                         break;
1286                 usb_unlock_device(dev);
1287                 schedule();
1288                 usb_lock_device(dev);
1289         }
1290         remove_wait_queue(&ps->wait, &wait);
1291         set_current_state(TASK_RUNNING);
1292         return as;
1293 }
1294
1295 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1296 {
1297         struct async *as = reap_as(ps);
1298         if (as)
1299                 return processcompl(as, (void __user * __user *)arg);
1300         if (signal_pending(current))
1301                 return -EINTR;
1302         return -EIO;
1303 }
1304
1305 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1306 {
1307         struct async *as;
1308
1309         if (!(as = async_getcompleted(ps)))
1310                 return -EAGAIN;
1311         return processcompl(as, (void __user * __user *)arg);
1312 }
1313
1314 #ifdef CONFIG_COMPAT
1315
1316 static int get_urb32(struct usbdevfs_urb *kurb,
1317                      struct usbdevfs_urb32 __user *uurb)
1318 {
1319         __u32  uptr;
1320         if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1321             __get_user(kurb->type, &uurb->type) ||
1322             __get_user(kurb->endpoint, &uurb->endpoint) ||
1323             __get_user(kurb->status, &uurb->status) ||
1324             __get_user(kurb->flags, &uurb->flags) ||
1325             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1326             __get_user(kurb->actual_length, &uurb->actual_length) ||
1327             __get_user(kurb->start_frame, &uurb->start_frame) ||
1328             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1329             __get_user(kurb->error_count, &uurb->error_count) ||
1330             __get_user(kurb->signr, &uurb->signr))
1331                 return -EFAULT;
1332
1333         if (__get_user(uptr, &uurb->buffer))
1334                 return -EFAULT;
1335         kurb->buffer = compat_ptr(uptr);
1336         if (__get_user(uptr, &uurb->usercontext))
1337                 return -EFAULT;
1338         kurb->usercontext = compat_ptr(uptr);
1339
1340         return 0;
1341 }
1342
1343 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1344 {
1345         struct usbdevfs_urb uurb;
1346
1347         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1348                 return -EFAULT;
1349
1350         return proc_do_submiturb(ps, &uurb,
1351                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1352                         arg);
1353 }
1354
1355 static int processcompl_compat(struct async *as, void __user * __user *arg)
1356 {
1357         struct urb *urb = as->urb;
1358         struct usbdevfs_urb32 __user *userurb = as->userurb;
1359         void __user *addr = as->userurb;
1360         unsigned int i;
1361
1362         if (as->userbuffer)
1363                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1364                                  urb->transfer_buffer_length))
1365                         return -EFAULT;
1366         if (put_user(as->status, &userurb->status))
1367                 return -EFAULT;
1368         if (put_user(urb->actual_length, &userurb->actual_length))
1369                 return -EFAULT;
1370         if (put_user(urb->error_count, &userurb->error_count))
1371                 return -EFAULT;
1372
1373         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1374                 for (i = 0; i < urb->number_of_packets; i++) {
1375                         if (put_user(urb->iso_frame_desc[i].actual_length,
1376                                      &userurb->iso_frame_desc[i].actual_length))
1377                                 return -EFAULT;
1378                         if (put_user(urb->iso_frame_desc[i].status,
1379                                      &userurb->iso_frame_desc[i].status))
1380                                 return -EFAULT;
1381                 }
1382         }
1383
1384         free_async(as);
1385         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1386                 return -EFAULT;
1387         return 0;
1388 }
1389
1390 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1391 {
1392         struct async *as = reap_as(ps);
1393         if (as)
1394                 return processcompl_compat(as, (void __user * __user *)arg);
1395         if (signal_pending(current))
1396                 return -EINTR;
1397         return -EIO;
1398 }
1399
1400 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1401 {
1402         struct async *as;
1403
1404         if (!(as = async_getcompleted(ps)))
1405                 return -EAGAIN;
1406         return processcompl_compat(as, (void __user * __user *)arg);
1407 }
1408
1409 #endif
1410
1411 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1412 {
1413         struct usbdevfs_disconnectsignal ds;
1414
1415         if (copy_from_user(&ds, arg, sizeof(ds)))
1416                 return -EFAULT;
1417         ps->discsignr = ds.signr;
1418         ps->disccontext = ds.context;
1419         return 0;
1420 }
1421
1422 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1423 {
1424         unsigned int ifnum;
1425
1426         if (get_user(ifnum, (unsigned int __user *)arg))
1427                 return -EFAULT;
1428         return claimintf(ps, ifnum);
1429 }
1430
1431 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1432 {
1433         unsigned int ifnum;
1434         int ret;
1435
1436         if (get_user(ifnum, (unsigned int __user *)arg))
1437                 return -EFAULT;
1438         if ((ret = releaseintf(ps, ifnum)) < 0)
1439                 return ret;
1440         destroy_async_on_interface (ps, ifnum);
1441         return 0;
1442 }
1443
1444 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1445 {
1446         int                     size;
1447         void                    *buf = NULL;
1448         int                     retval = 0;
1449         struct usb_interface    *intf = NULL;
1450         struct usb_driver       *driver = NULL;
1451
1452         /* alloc buffer */
1453         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1454                 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1455                         return -ENOMEM;
1456                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1457                         if (copy_from_user(buf, ctl->data, size)) {
1458                                 kfree(buf);
1459                                 return -EFAULT;
1460                         }
1461                 } else {
1462                         memset(buf, 0, size);
1463                 }
1464         }
1465
1466         if (!connected(ps)) {
1467                 kfree(buf);
1468                 return -ENODEV;
1469         }
1470
1471         if (ps->dev->state != USB_STATE_CONFIGURED)
1472                 retval = -EHOSTUNREACH;
1473         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1474                 retval = -EINVAL;
1475         else switch (ctl->ioctl_code) {
1476
1477         /* disconnect kernel driver from interface */
1478         case USBDEVFS_DISCONNECT:
1479                 if (intf->dev.driver) {
1480                         driver = to_usb_driver(intf->dev.driver);
1481                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1482                         usb_driver_release_interface(driver, intf);
1483                 } else
1484                         retval = -ENODATA;
1485                 break;
1486
1487         /* let kernel drivers try to (re)bind to the interface */
1488         case USBDEVFS_CONNECT:
1489                 if (!intf->dev.driver)
1490                         retval = device_attach(&intf->dev);
1491                 else
1492                         retval = -EBUSY;
1493                 break;
1494
1495         /* talk directly to the interface's driver */
1496         default:
1497                 if (intf->dev.driver)
1498                         driver = to_usb_driver(intf->dev.driver);
1499                 if (driver == NULL || driver->ioctl == NULL) {
1500                         retval = -ENOTTY;
1501                 } else {
1502                         retval = driver->ioctl(intf, ctl->ioctl_code, buf);
1503                         if (retval == -ENOIOCTLCMD)
1504                                 retval = -ENOTTY;
1505                 }
1506         }
1507
1508         /* cleanup and return */
1509         if (retval >= 0
1510                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1511                         && size > 0
1512                         && copy_to_user(ctl->data, buf, size) != 0)
1513                 retval = -EFAULT;
1514
1515         kfree(buf);
1516         return retval;
1517 }
1518
1519 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1520 {
1521         struct usbdevfs_ioctl   ctrl;
1522
1523         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1524                 return -EFAULT;
1525         return proc_ioctl(ps, &ctrl);
1526 }
1527
1528 #ifdef CONFIG_COMPAT
1529 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1530 {
1531         struct usbdevfs_ioctl32 __user *uioc;
1532         struct usbdevfs_ioctl ctrl;
1533         u32 udata;
1534
1535         uioc = compat_ptr((long)arg);
1536         if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1537             __get_user(ctrl.ifno, &uioc->ifno) ||
1538             __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1539             __get_user(udata, &uioc->data))
1540                 return -EFAULT;
1541         ctrl.data = compat_ptr(udata);
1542
1543         return proc_ioctl(ps, &ctrl);
1544 }
1545 #endif
1546
1547 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1548 {
1549         unsigned portnum;
1550         int rc;
1551
1552         if (get_user(portnum, (unsigned __user *) arg))
1553                 return -EFAULT;
1554         rc = usb_hub_claim_port(ps->dev, portnum, ps);
1555         if (rc == 0)
1556                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1557                         portnum, task_pid_nr(current), current->comm);
1558         return rc;
1559 }
1560
1561 static int proc_release_port(struct dev_state *ps, void __user *arg)
1562 {
1563         unsigned portnum;
1564
1565         if (get_user(portnum, (unsigned __user *) arg))
1566                 return -EFAULT;
1567         return usb_hub_release_port(ps->dev, portnum, ps);
1568 }
1569
1570 /*
1571  * NOTE:  All requests here that have interface numbers as parameters
1572  * are assuming that somehow the configuration has been prevented from
1573  * changing.  But there's no mechanism to ensure that...
1574  */
1575 static int usbdev_ioctl(struct inode *inode, struct file *file,
1576                         unsigned int cmd, unsigned long arg)
1577 {
1578         struct dev_state *ps = file->private_data;
1579         struct usb_device *dev = ps->dev;
1580         void __user *p = (void __user *)arg;
1581         int ret = -ENOTTY;
1582
1583         if (!(file->f_mode & FMODE_WRITE))
1584                 return -EPERM;
1585         usb_lock_device(dev);
1586         if (!connected(ps)) {
1587                 usb_unlock_device(dev);
1588                 return -ENODEV;
1589         }
1590
1591         switch (cmd) {
1592         case USBDEVFS_CONTROL:
1593                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1594                 ret = proc_control(ps, p);
1595                 if (ret >= 0)
1596                         inode->i_mtime = CURRENT_TIME;
1597                 break;
1598
1599         case USBDEVFS_BULK:
1600                 snoop(&dev->dev, "%s: BULK\n", __func__);
1601                 ret = proc_bulk(ps, p);
1602                 if (ret >= 0)
1603                         inode->i_mtime = CURRENT_TIME;
1604                 break;
1605
1606         case USBDEVFS_RESETEP:
1607                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1608                 ret = proc_resetep(ps, p);
1609                 if (ret >= 0)
1610                         inode->i_mtime = CURRENT_TIME;
1611                 break;
1612
1613         case USBDEVFS_RESET:
1614                 snoop(&dev->dev, "%s: RESET\n", __func__);
1615                 ret = proc_resetdevice(ps);
1616                 break;
1617
1618         case USBDEVFS_CLEAR_HALT:
1619                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1620                 ret = proc_clearhalt(ps, p);
1621                 if (ret >= 0)
1622                         inode->i_mtime = CURRENT_TIME;
1623                 break;
1624
1625         case USBDEVFS_GETDRIVER:
1626                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1627                 ret = proc_getdriver(ps, p);
1628                 break;
1629
1630         case USBDEVFS_CONNECTINFO:
1631                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1632                 ret = proc_connectinfo(ps, p);
1633                 break;
1634
1635         case USBDEVFS_SETINTERFACE:
1636                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1637                 ret = proc_setintf(ps, p);
1638                 break;
1639
1640         case USBDEVFS_SETCONFIGURATION:
1641                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1642                 ret = proc_setconfig(ps, p);
1643                 break;
1644
1645         case USBDEVFS_SUBMITURB:
1646                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1647                 ret = proc_submiturb(ps, p);
1648                 if (ret >= 0)
1649                         inode->i_mtime = CURRENT_TIME;
1650                 break;
1651
1652 #ifdef CONFIG_COMPAT
1653
1654         case USBDEVFS_SUBMITURB32:
1655                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1656                 ret = proc_submiturb_compat(ps, p);
1657                 if (ret >= 0)
1658                         inode->i_mtime = CURRENT_TIME;
1659                 break;
1660
1661         case USBDEVFS_REAPURB32:
1662                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1663                 ret = proc_reapurb_compat(ps, p);
1664                 break;
1665
1666         case USBDEVFS_REAPURBNDELAY32:
1667                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
1668                 ret = proc_reapurbnonblock_compat(ps, p);
1669                 break;
1670
1671         case USBDEVFS_IOCTL32:
1672                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1673                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1674                 break;
1675 #endif
1676
1677         case USBDEVFS_DISCARDURB:
1678                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1679                 ret = proc_unlinkurb(ps, p);
1680                 break;
1681
1682         case USBDEVFS_REAPURB:
1683                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1684                 ret = proc_reapurb(ps, p);
1685                 break;
1686
1687         case USBDEVFS_REAPURBNDELAY:
1688                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
1689                 ret = proc_reapurbnonblock(ps, p);
1690                 break;
1691
1692         case USBDEVFS_DISCSIGNAL:
1693                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1694                 ret = proc_disconnectsignal(ps, p);
1695                 break;
1696
1697         case USBDEVFS_CLAIMINTERFACE:
1698                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1699                 ret = proc_claiminterface(ps, p);
1700                 break;
1701
1702         case USBDEVFS_RELEASEINTERFACE:
1703                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1704                 ret = proc_releaseinterface(ps, p);
1705                 break;
1706
1707         case USBDEVFS_IOCTL:
1708                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1709                 ret = proc_ioctl_default(ps, p);
1710                 break;
1711
1712         case USBDEVFS_CLAIM_PORT:
1713                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
1714                 ret = proc_claim_port(ps, p);
1715                 break;
1716
1717         case USBDEVFS_RELEASE_PORT:
1718                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
1719                 ret = proc_release_port(ps, p);
1720                 break;
1721         }
1722         usb_unlock_device(dev);
1723         if (ret >= 0)
1724                 inode->i_atime = CURRENT_TIME;
1725         return ret;
1726 }
1727
1728 /* No kernel lock - fine */
1729 static unsigned int usbdev_poll(struct file *file,
1730                                 struct poll_table_struct *wait)
1731 {
1732         struct dev_state *ps = file->private_data;
1733         unsigned int mask = 0;
1734
1735         poll_wait(file, &ps->wait, wait);
1736         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1737                 mask |= POLLOUT | POLLWRNORM;
1738         if (!connected(ps))
1739                 mask |= POLLERR | POLLHUP;
1740         return mask;
1741 }
1742
1743 const struct file_operations usbdev_file_operations = {
1744         .owner =        THIS_MODULE,
1745         .llseek =       usbdev_lseek,
1746         .read =         usbdev_read,
1747         .poll =         usbdev_poll,
1748         .ioctl =        usbdev_ioctl,
1749         .open =         usbdev_open,
1750         .release =      usbdev_release,
1751 };
1752
1753 static void usbdev_remove(struct usb_device *udev)
1754 {
1755         struct dev_state *ps;
1756         struct siginfo sinfo;
1757
1758         while (!list_empty(&udev->filelist)) {
1759                 ps = list_entry(udev->filelist.next, struct dev_state, list);
1760                 destroy_all_async(ps);
1761                 wake_up_all(&ps->wait);
1762                 list_del_init(&ps->list);
1763                 if (ps->discsignr) {
1764                         sinfo.si_signo = ps->discsignr;
1765                         sinfo.si_errno = EPIPE;
1766                         sinfo.si_code = SI_ASYNCIO;
1767                         sinfo.si_addr = ps->disccontext;
1768                         kill_pid_info_as_uid(ps->discsignr, &sinfo,
1769                                         ps->disc_pid, ps->disc_uid,
1770                                         ps->disc_euid, ps->secid);
1771                 }
1772         }
1773 }
1774
1775 #ifdef CONFIG_USB_DEVICE_CLASS
1776 static struct class *usb_classdev_class;
1777
1778 static int usb_classdev_add(struct usb_device *dev)
1779 {
1780         struct device *cldev;
1781
1782         cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
1783                               NULL, "usbdev%d.%d", dev->bus->busnum,
1784                               dev->devnum);
1785         if (IS_ERR(cldev))
1786                 return PTR_ERR(cldev);
1787         dev->usb_classdev = cldev;
1788         return 0;
1789 }
1790
1791 static void usb_classdev_remove(struct usb_device *dev)
1792 {
1793         if (dev->usb_classdev)
1794                 device_unregister(dev->usb_classdev);
1795 }
1796
1797 #else
1798 #define usb_classdev_add(dev)           0
1799 #define usb_classdev_remove(dev)        do {} while (0)
1800
1801 #endif
1802
1803 static int usbdev_notify(struct notifier_block *self,
1804                                unsigned long action, void *dev)
1805 {
1806         switch (action) {
1807         case USB_DEVICE_ADD:
1808                 if (usb_classdev_add(dev))
1809                         return NOTIFY_BAD;
1810                 break;
1811         case USB_DEVICE_REMOVE:
1812                 usb_classdev_remove(dev);
1813                 usbdev_remove(dev);
1814                 break;
1815         }
1816         return NOTIFY_OK;
1817 }
1818
1819 static struct notifier_block usbdev_nb = {
1820         .notifier_call =        usbdev_notify,
1821 };
1822
1823 static struct cdev usb_device_cdev;
1824
1825 int __init usb_devio_init(void)
1826 {
1827         int retval;
1828
1829         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1830                                         "usb_device");
1831         if (retval) {
1832                 printk(KERN_ERR "Unable to register minors for usb_device\n");
1833                 goto out;
1834         }
1835         cdev_init(&usb_device_cdev, &usbdev_file_operations);
1836         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1837         if (retval) {
1838                 printk(KERN_ERR "Unable to get usb_device major %d\n",
1839                        USB_DEVICE_MAJOR);
1840                 goto error_cdev;
1841         }
1842 #ifdef CONFIG_USB_DEVICE_CLASS
1843         usb_classdev_class = class_create(THIS_MODULE, "usb_device");
1844         if (IS_ERR(usb_classdev_class)) {
1845                 printk(KERN_ERR "Unable to register usb_device class\n");
1846                 retval = PTR_ERR(usb_classdev_class);
1847                 cdev_del(&usb_device_cdev);
1848                 usb_classdev_class = NULL;
1849                 goto out;
1850         }
1851         /* devices of this class shadow the major:minor of their parent
1852          * device, so clear ->dev_kobj to prevent adding duplicate entries
1853          * to /sys/dev
1854          */
1855         usb_classdev_class->dev_kobj = NULL;
1856 #endif
1857         usb_register_notify(&usbdev_nb);
1858 out:
1859         return retval;
1860
1861 error_cdev:
1862         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1863         goto out;
1864 }
1865
1866 void usb_devio_cleanup(void)
1867 {
1868         usb_unregister_notify(&usbdev_nb);
1869 #ifdef CONFIG_USB_DEVICE_CLASS
1870         class_destroy(usb_classdev_class);
1871 #endif
1872         cdev_del(&usb_device_cdev);
1873         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1874 }