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