drivers/usb/core/devio.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *      devio.c  --  User space communication with USB devices.
   5  *
   6  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   7  *
   8  *      This program is free software; you can redistribute it and/or modify
   9  *      it under the terms of the GNU General Public License as published by
  10  *      the Free Software Foundation; either version 2 of the License, or
  11  *      (at your option) any later version.
  12  *
  13  *      This program is distributed in the hope that it will be useful,
  14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *      GNU General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License
  19  *      along with this program; if not, write to the Free Software
  20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  *  This file implements the usbfs/x/y files, where
  23  *  x is the bus number and y the device number.
  24  *
  25  *  It allows user space programs/"drivers" to communicate directly
  26  *  with USB devices without intervening kernel driver.
  27  *
  28  *  Revision history
  29  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  30  *    04.01.2000   0.2   Turned into its own filesystem
  31  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  32  *                       (CAN-2005-3055)
  33  */
  34
  35 /*****************************************************************************/
  36
  37 #include <linux/fs.h>
  38 #include <linux/mm.h>
  39 #include <linux/slab.h>
  40 #include <linux/smp_lock.h>
  41 #include <linux/signal.h>
  42 #include <linux/poll.h>
  43 #include <linux/module.h>
  44 #include <linux/usb.h>
  45 #include <linux/usbdevice_fs.h>
  46 #include <linux/cdev.h>
  47 #include <linux/notifier.h>
  48 #include <linux/security.h>
  49 #include <asm/uaccess.h>
  50 #include <asm/byteorder.h>
  51 #include <linux/moduleparam.h>
  52
  53 #include "hcd.h"        /* for usbcore internals */
  54 #include "usb.h"
  55
  56 #define USB_MAXBUS                      64
  57 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
  58
  59 /* Mutual exclusion for removal, open, and release */
  60 DEFINE_MUTEX(usbfs_mutex);
  61
  62 struct dev_state {
  63         struct list_head list;      /* state list */
  64         struct usb_device *dev;
  65         struct file *file;
  66         spinlock_t lock;            /* protects the async urb lists */
  67         struct list_head async_pending;
  68         struct list_head async_completed;
  69         wait_queue_head_t wait;     /* wake up if a request completed */
  70         unsigned int discsignr;
  71         struct pid *disc_pid;
  72         uid_t disc_uid, disc_euid;
  73         void __user *disccontext;
  74         unsigned long ifclaimed;
  75         u32 secid;
  76 };
  77
  78 struct async {
  79         struct list_head asynclist;
  80         struct dev_state *ps;
  81         struct pid *pid;
  82         uid_t uid, euid;
  83         unsigned int signr;
  84         unsigned int ifnum;
  85         void __user *userbuffer;
  86         void __user *userurb;
  87         struct urb *urb;
  88         int status;
  89         u32 secid;
  90 };
  91
  92 static int usbfs_snoop;
  93 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  94 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
  95
  96 #define snoop(dev, format, arg...)                              \
  97         do {                                                    \
  98                 if (usbfs_snoop)                                \
  99                         dev_info(dev , format , ## arg);        \
 100         } while (0)
 101
 102 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 103
 104
 105 #define MAX_USBFS_BUFFER_SIZE   16384
 106
 107 static inline int connected(struct dev_state *ps)
 108 {
 109         return (!list_empty(&ps->list) &&
 110                         ps->dev->state != USB_STATE_NOTATTACHED);
 111 }
 112
 113 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
 114 {
 115         loff_t ret;
 116
 117         lock_kernel();
 118
 119         switch (orig) {
 120         case 0:
 121                 file->f_pos = offset;
 122                 ret = file->f_pos;
 123                 break;
 124         case 1:
 125                 file->f_pos += offset;
 126                 ret = file->f_pos;
 127                 break;
 128         case 2:
 129         default:
 130                 ret = -EINVAL;
 131         }
 132
 133         unlock_kernel();
 134         return ret;
 135 }
 136
 137 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 138                            loff_t *ppos)
 139 {
 140         struct dev_state *ps = file->private_data;
 141         struct usb_device *dev = ps->dev;
 142         ssize_t ret = 0;
 143         unsigned len;
 144         loff_t pos;
 145         int i;
 146
 147         pos = *ppos;
 148         usb_lock_device(dev);
 149         if (!connected(ps)) {
 150                 ret = -ENODEV;
 151                 goto err;
 152         } else if (pos < 0) {
 153                 ret = -EINVAL;
 154                 goto err;
 155         }
 156
 157         if (pos < sizeof(struct usb_device_descriptor)) {
 158                 /* 18 bytes - fits on the stack */
 159                 struct usb_device_descriptor temp_desc;
 160
 161                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 162                 le16_to_cpus(&temp_desc.bcdUSB);
 163                 le16_to_cpus(&temp_desc.idVendor);
 164                 le16_to_cpus(&temp_desc.idProduct);
 165                 le16_to_cpus(&temp_desc.bcdDevice);
 166
 167                 len = sizeof(struct usb_device_descriptor) - pos;
 168                 if (len > nbytes)
 169                         len = nbytes;
 170                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 171                         ret = -EFAULT;
 172                         goto err;
 173                 }
 174
 175                 *ppos += len;
 176                 buf += len;
 177                 nbytes -= len;
 178                 ret += len;
 179         }
 180
 181         pos = sizeof(struct usb_device_descriptor);
 182         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 183                 struct usb_config_descriptor *config =
 184                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 185                 unsigned int length = le16_to_cpu(config->wTotalLength);
 186
 187                 if (*ppos < pos + length) {
 188
 189                         /* The descriptor may claim to be longer than it
 190                          * really is.  Here is the actual allocated length. */
 191                         unsigned alloclen =
 192                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 193
 194                         len = length - (*ppos - pos);
 195                         if (len > nbytes)
 196                                 len = nbytes;
 197
 198                         /* Simply don't write (skip over) unallocated parts */
 199                         if (alloclen > (*ppos - pos)) {
 200                                 alloclen -= (*ppos - pos);
 201                                 if (copy_to_user(buf,
 202                                     dev->rawdescriptors[i] + (*ppos - pos),
 203                                     min(len, alloclen))) {
 204                                         ret = -EFAULT;
 205                                         goto err;
 206                                 }
 207                         }
 208
 209                         *ppos += len;
 210                         buf += len;
 211                         nbytes -= len;
 212                         ret += len;
 213                 }
 214
 215                 pos += length;
 216         }
 217
 218 err:
 219         usb_unlock_device(dev);
 220         return ret;
 221 }
 222
 223 /*
 224  * async list handling
 225  */
 226
 227 static struct async *alloc_async(unsigned int numisoframes)
 228 {
 229         struct async *as;
 230
 231         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 232         if (!as)
 233                 return NULL;
 234         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 235         if (!as->urb) {
 236                 kfree(as);
 237                 return NULL;
 238         }
 239         return as;
 240 }
 241
 242 static void free_async(struct async *as)
 243 {
 244         put_pid(as->pid);
 245         kfree(as->urb->transfer_buffer);
 246         kfree(as->urb->setup_packet);
 247         usb_free_urb(as->urb);
 248         kfree(as);
 249 }
 250
 251 static inline void async_newpending(struct async *as)
 252 {
 253         struct dev_state *ps = as->ps;
 254         unsigned long flags;
 255
 256         spin_lock_irqsave(&ps->lock, flags);
 257         list_add_tail(&as->asynclist, &ps->async_pending);
 258         spin_unlock_irqrestore(&ps->lock, flags);
 259 }
 260
 261 static inline void async_removepending(struct async *as)
 262 {
 263         struct dev_state *ps = as->ps;
 264         unsigned long flags;
 265
 266         spin_lock_irqsave(&ps->lock, flags);
 267         list_del_init(&as->asynclist);
 268         spin_unlock_irqrestore(&ps->lock, flags);
 269 }
 270
 271 static inline struct async *async_getcompleted(struct dev_state *ps)
 272 {
 273         unsigned long flags;
 274         struct async *as = NULL;
 275
 276         spin_lock_irqsave(&ps->lock, flags);
 277         if (!list_empty(&ps->async_completed)) {
 278                 as = list_entry(ps->async_completed.next, struct async,
 279                                 asynclist);
 280                 list_del_init(&as->asynclist);
 281         }
 282         spin_unlock_irqrestore(&ps->lock, flags);
 283         return as;
 284 }
 285
 286 static inline struct async *async_getpending(struct dev_state *ps,
 287                                              void __user *userurb)
 288 {
 289         unsigned long flags;
 290         struct async *as;
 291
 292         spin_lock_irqsave(&ps->lock, flags);
 293         list_for_each_entry(as, &ps->async_pending, asynclist)
 294                 if (as->userurb == userurb) {
 295                         list_del_init(&as->asynclist);
 296                         spin_unlock_irqrestore(&ps->lock, flags);
 297                         return as;
 298                 }
 299         spin_unlock_irqrestore(&ps->lock, flags);
 300         return NULL;
 301 }
 302
 303 static void snoop_urb(struct urb *urb, void __user *userurb)
 304 {
 305         int j;
 306         unsigned char *data = urb->transfer_buffer;
 307
 308         if (!usbfs_snoop)
 309                 return;
 310
 311         dev_info(&urb->dev->dev, "direction=%s\n",
 312                         usb_urb_dir_in(urb) ? "IN" : "OUT");
 313         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
 314         dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
 315                  urb->transfer_buffer_length);
 316         dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
 317         dev_info(&urb->dev->dev, "data: ");
 318         for (j = 0; j < urb->transfer_buffer_length; ++j)
 319                 printk("%02x ", data[j]);
 320         printk("\n");
 321 }
 322
 323 static void async_completed(struct urb *urb)
 324 {
 325         struct async *as = urb->context;
 326         struct dev_state *ps = as->ps;
 327         struct siginfo sinfo;
 328
 329         spin_lock(&ps->lock);
 330         list_move_tail(&as->asynclist, &ps->async_completed);
 331         spin_unlock(&ps->lock);
 332         as->status = urb->status;
 333         if (as->signr) {
 334                 sinfo.si_signo = as->signr;
 335                 sinfo.si_errno = as->status;
 336                 sinfo.si_code = SI_ASYNCIO;
 337                 sinfo.si_addr = as->userurb;
 338                 kill_pid_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
 339                                       as->euid, as->secid);
 340         }
 341         snoop(&urb->dev->dev, "urb complete\n");
 342         snoop_urb(urb, as->userurb);
 343         wake_up(&ps->wait);
 344 }
 345
 346 static void destroy_async(struct dev_state *ps, struct list_head *list)
 347 {
 348         struct async *as;
 349         unsigned long flags;
 350
 351         spin_lock_irqsave(&ps->lock, flags);
 352         while (!list_empty(list)) {
 353                 as = list_entry(list->next, struct async, asynclist);
 354                 list_del_init(&as->asynclist);
 355
 356                 /* drop the spinlock so the completion handler can run */
 357                 spin_unlock_irqrestore(&ps->lock, flags);
 358                 usb_kill_urb(as->urb);
 359                 spin_lock_irqsave(&ps->lock, flags);
 360         }
 361         spin_unlock_irqrestore(&ps->lock, flags);
 362         as = async_getcompleted(ps);
 363         while (as) {
 364                 free_async(as);
 365                 as = async_getcompleted(ps);
 366         }
 367 }
 368
 369 static void destroy_async_on_interface(struct dev_state *ps,
 370                                        unsigned int ifnum)
 371 {
 372         struct list_head *p, *q, hitlist;
 373         unsigned long flags;
 374
 375         INIT_LIST_HEAD(&hitlist);
 376         spin_lock_irqsave(&ps->lock, flags);
 377         list_for_each_safe(p, q, &ps->async_pending)
 378                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 379                         list_move_tail(p, &hitlist);
 380         spin_unlock_irqrestore(&ps->lock, flags);
 381         destroy_async(ps, &hitlist);
 382 }
 383
 384 static inline void destroy_all_async(struct dev_state *ps)
 385 {
 386         destroy_async(ps, &ps->async_pending);
 387 }
 388
 389 /*
 390  * interface claims are made only at the request of user level code,
 391  * which can also release them (explicitly or by closing files).
 392  * they're also undone when devices disconnect.
 393  */
 394
 395 static int driver_probe(struct usb_interface *intf,
 396                         const struct usb_device_id *id)
 397 {
 398         return -ENODEV;
 399 }
 400
 401 static void driver_disconnect(struct usb_interface *intf)
 402 {
 403         struct dev_state *ps = usb_get_intfdata(intf);
 404         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 405
 406         if (!ps)
 407                 return;
 408
 409         /* NOTE:  this relies on usbcore having canceled and completed
 410          * all pending I/O requests; 2.6 does that.
 411          */
 412
 413         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 414                 clear_bit(ifnum, &ps->ifclaimed);
 415         else
 416                 warn("interface number %u out of range", ifnum);
 417
 418         usb_set_intfdata(intf, NULL);
 419
 420         /* force async requests to complete */
 421         destroy_async_on_interface(ps, ifnum);
 422 }
 423
 424 /* The following routines are merely placeholders.  There is no way
 425  * to inform a user task about suspend or resumes.
 426  */
 427 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 428 {
 429         return 0;
 430 }
 431
 432 static int driver_resume(struct usb_interface *intf)
 433 {
 434         return 0;
 435 }
 436
 437 struct usb_driver usbfs_driver = {
 438         .name =         "usbfs",
 439         .probe =        driver_probe,
 440         .disconnect =   driver_disconnect,
 441         .suspend =      driver_suspend,
 442         .resume =       driver_resume,
 443 };
 444
 445 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 446 {
 447         struct usb_device *dev = ps->dev;
 448         struct usb_interface *intf;
 449         int err;
 450
 451         if (ifnum >= 8*sizeof(ps->ifclaimed))
 452                 return -EINVAL;
 453         /* already claimed */
 454         if (test_bit(ifnum, &ps->ifclaimed))
 455                 return 0;
 456
 457         intf = usb_ifnum_to_if(dev, ifnum);
 458         if (!intf)
 459                 err = -ENOENT;
 460         else
 461                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 462         if (err == 0)
 463                 set_bit(ifnum, &ps->ifclaimed);
 464         return err;
 465 }
 466
 467 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 468 {
 469         struct usb_device *dev;
 470         struct usb_interface *intf;
 471         int err;
 472
 473         err = -EINVAL;
 474         if (ifnum >= 8*sizeof(ps->ifclaimed))
 475                 return err;
 476         dev = ps->dev;
 477         intf = usb_ifnum_to_if(dev, ifnum);
 478         if (!intf)
 479                 err = -ENOENT;
 480         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 481                 usb_driver_release_interface(&usbfs_driver, intf);
 482                 err = 0;
 483         }
 484         return err;
 485 }
 486
 487 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 488 {
 489         if (ps->dev->state != USB_STATE_CONFIGURED)
 490                 return -EHOSTUNREACH;
 491         if (ifnum >= 8*sizeof(ps->ifclaimed))
 492                 return -EINVAL;
 493         if (test_bit(ifnum, &ps->ifclaimed))
 494                 return 0;
 495         /* if not yet claimed, claim it for the driver */
 496         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 497                  "interface %u before use\n", task_pid_nr(current),
 498                  current->comm, ifnum);
 499         return claimintf(ps, ifnum);
 500 }
 501
 502 static int findintfep(struct usb_device *dev, unsigned int ep)
 503 {
 504         unsigned int i, j, e;
 505         struct usb_interface *intf;
 506         struct usb_host_interface *alts;
 507         struct usb_endpoint_descriptor *endpt;
 508
 509         if (ep & ~(USB_DIR_IN|0xf))
 510                 return -EINVAL;
 511         if (!dev->actconfig)
 512                 return -ESRCH;
 513         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 514                 intf = dev->actconfig->interface[i];
 515                 for (j = 0; j < intf->num_altsetting; j++) {
 516                         alts = &intf->altsetting[j];
 517                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 518                                 endpt = &alts->endpoint[e].desc;
 519                                 if (endpt->bEndpointAddress == ep)
 520                                         return alts->desc.bInterfaceNumber;
 521                         }
 522                 }
 523         }
 524         return -ENOENT;
 525 }
 526
 527 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
 528                            unsigned int index)
 529 {
 530         int ret = 0;
 531
 532         if (ps->dev->state != USB_STATE_ADDRESS
 533          && ps->dev->state != USB_STATE_CONFIGURED)
 534                 return -EHOSTUNREACH;
 535         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 536                 return 0;
 537
 538         index &= 0xff;
 539         switch (requesttype & USB_RECIP_MASK) {
 540         case USB_RECIP_ENDPOINT:
 541                 ret = findintfep(ps->dev, index);
 542                 if (ret >= 0)
 543                         ret = checkintf(ps, ret);
 544                 break;
 545
 546         case USB_RECIP_INTERFACE:
 547                 ret = checkintf(ps, index);
 548                 break;
 549         }
 550         return ret;
 551 }
 552
 553 static int match_devt(struct device *dev, void *data)
 554 {
 555         return dev->devt == (dev_t) (unsigned long) data;
 556 }
 557
 558 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 559 {
 560         struct device *dev;
 561
 562         dev = bus_find_device(&usb_bus_type, NULL,
 563                               (void *) (unsigned long) devt, match_devt);
 564         if (!dev)
 565                 return NULL;
 566         return container_of(dev, struct usb_device, dev);
 567 }
 568
 569 /*
 570  * file operations
 571  */
 572 static int usbdev_open(struct inode *inode, struct file *file)
 573 {
 574         struct usb_device *dev = NULL;
 575         struct dev_state *ps;
 576         int ret;
 577
 578         lock_kernel();
 579         /* Protect against simultaneous removal or release */
 580         mutex_lock(&usbfs_mutex);
 581
 582         ret = -ENOMEM;
 583         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
 584         if (!ps)
 585                 goto out;
 586
 587         ret = -ENOENT;
 588
 589         /* usbdev device-node */
 590         if (imajor(inode) == USB_DEVICE_MAJOR)
 591                 dev = usbdev_lookup_by_devt(inode->i_rdev);
 592 #ifdef CONFIG_USB_DEVICEFS
 593         /* procfs file */
 594         if (!dev) {
 595                 dev = inode->i_private;
 596                 if (dev && dev->usbfs_dentry &&
 597                                         dev->usbfs_dentry->d_inode == inode)
 598                         usb_get_dev(dev);
 599                 else
 600                         dev = NULL;
 601         }
 602 #endif
 603         if (!dev || dev->state == USB_STATE_NOTATTACHED)
 604                 goto out;
 605         ret = usb_autoresume_device(dev);
 606         if (ret)
 607                 goto out;
 608
 609         ret = 0;
 610         ps->dev = dev;
 611         ps->file = file;
 612         spin_lock_init(&ps->lock);
 613         INIT_LIST_HEAD(&ps->list);
 614         INIT_LIST_HEAD(&ps->async_pending);
 615         INIT_LIST_HEAD(&ps->async_completed);
 616         init_waitqueue_head(&ps->wait);
 617         ps->discsignr = 0;
 618         ps->disc_pid = get_pid(task_pid(current));
 619         ps->disc_uid = current->uid;
 620         ps->disc_euid = current->euid;
 621         ps->disccontext = NULL;
 622         ps->ifclaimed = 0;
 623         security_task_getsecid(current, &ps->secid);
 624         smp_wmb();
 625         list_add_tail(&ps->list, &dev->filelist);
 626         file->private_data = ps;
 627         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
 628                         current->comm);
 629  out:
 630         if (ret) {
 631                 kfree(ps);
 632                 usb_put_dev(dev);
 633         }
 634         mutex_unlock(&usbfs_mutex);
 635         unlock_kernel();
 636         return ret;
 637 }
 638
 639 static int usbdev_release(struct inode *inode, struct file *file)
 640 {
 641         struct dev_state *ps = file->private_data;
 642         struct usb_device *dev = ps->dev;
 643         unsigned int ifnum;
 644
 645         usb_lock_device(dev);
 646
 647         /* Protect against simultaneous open */
 648         mutex_lock(&usbfs_mutex);
 649         list_del_init(&ps->list);
 650         mutex_unlock(&usbfs_mutex);
 651
 652         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 653                         ifnum++) {
 654                 if (test_bit(ifnum, &ps->ifclaimed))
 655                         releaseintf(ps, ifnum);
 656         }
 657         destroy_all_async(ps);
 658         usb_autosuspend_device(dev);
 659         usb_unlock_device(dev);
 660         usb_put_dev(dev);
 661         put_pid(ps->disc_pid);
 662         kfree(ps);
 663         return 0;
 664 }
 665
 666 static int proc_control(struct dev_state *ps, void __user *arg)
 667 {
 668         struct usb_device *dev = ps->dev;
 669         struct usbdevfs_ctrltransfer ctrl;
 670         unsigned int tmo;
 671         unsigned char *tbuf;
 672         unsigned wLength;
 673         int i, j, ret;
 674
 675         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 676                 return -EFAULT;
 677         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
 678         if (ret)
 679                 return ret;
 680         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
 681         if (wLength > PAGE_SIZE)
 682                 return -EINVAL;
 683         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
 684         if (!tbuf)
 685                 return -ENOMEM;
 686         tmo = ctrl.timeout;
 687         if (ctrl.bRequestType & 0x80) {
 688                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
 689                                                ctrl.wLength)) {
 690                         free_page((unsigned long)tbuf);
 691                         return -EINVAL;
 692                 }
 693                 snoop(&dev->dev, "control read: bRequest=%02x "
 694                                 "bRrequestType=%02x wValue=%04x "
 695                                 "wIndex=%04x wLength=%04x\n",
 696                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 697                                 ctrl.wIndex, ctrl.wLength);
 698
 699                 usb_unlock_device(dev);
 700                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest,
 701                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 702                                     tbuf, ctrl.wLength, tmo);
 703                 usb_lock_device(dev);
 704                 if ((i > 0) && ctrl.wLength) {
 705                         if (usbfs_snoop) {
 706                                 dev_info(&dev->dev, "control read: data ");
 707                                 for (j = 0; j < i; ++j)
 708                                         printk("%02x ", (u8)(tbuf)[j]);
 709                                 printk("\n");
 710                         }
 711                         if (copy_to_user(ctrl.data, tbuf, i)) {
 712                                 free_page((unsigned long)tbuf);
 713                                 return -EFAULT;
 714                         }
 715                 }
 716         } else {
 717                 if (ctrl.wLength) {
 718                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 719                                 free_page((unsigned long)tbuf);
 720                                 return -EFAULT;
 721                         }
 722                 }
 723                 snoop(&dev->dev, "control write: bRequest=%02x "
 724                                 "bRrequestType=%02x wValue=%04x "
 725                                 "wIndex=%04x wLength=%04x\n",
 726                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 727                                 ctrl.wIndex, ctrl.wLength);
 728                 if (usbfs_snoop) {
 729                         dev_info(&dev->dev, "control write: data: ");
 730                         for (j = 0; j < ctrl.wLength; ++j)
 731                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 732                         printk("\n");
 733                 }
 734                 usb_unlock_device(dev);
 735                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
 736                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 737                                     tbuf, ctrl.wLength, tmo);
 738                 usb_lock_device(dev);
 739         }
 740         free_page((unsigned long)tbuf);
 741         if (i < 0 && i != -EPIPE) {
 742                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 743                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 744                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 745                            ctrl.wLength, i);
 746         }
 747         return i;
 748 }
 749
 750 static int proc_bulk(struct dev_state *ps, void __user *arg)
 751 {
 752         struct usb_device *dev = ps->dev;
 753         struct usbdevfs_bulktransfer bulk;
 754         unsigned int tmo, len1, pipe;
 755         int len2;
 756         unsigned char *tbuf;
 757         int i, j, ret;
 758
 759         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 760                 return -EFAULT;
 761         ret = findintfep(ps->dev, bulk.ep);
 762         if (ret < 0)
 763                 return ret;
 764         ret = checkintf(ps, ret);
 765         if (ret)
 766                 return ret;
 767         if (bulk.ep & USB_DIR_IN)
 768                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 769         else
 770                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 771         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 772                 return -EINVAL;
 773         len1 = bulk.len;
 774         if (len1 > MAX_USBFS_BUFFER_SIZE)
 775                 return -EINVAL;
 776         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 777                 return -ENOMEM;
 778         tmo = bulk.timeout;
 779         if (bulk.ep & 0x80) {
 780                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 781                         kfree(tbuf);
 782                         return -EINVAL;
 783                 }
 784                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
 785                         bulk.len, bulk.timeout);
 786                 usb_unlock_device(dev);
 787                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 788                 usb_lock_device(dev);
 789                 if (!i && len2) {
 790                         if (usbfs_snoop) {
 791                                 dev_info(&dev->dev, "bulk read: data ");
 792                                 for (j = 0; j < len2; ++j)
 793                                         printk("%02x ", (u8)(tbuf)[j]);
 794                                 printk("\n");
 795                         }
 796                         if (copy_to_user(bulk.data, tbuf, len2)) {
 797                                 kfree(tbuf);
 798                                 return -EFAULT;
 799                         }
 800                 }
 801         } else {
 802                 if (len1) {
 803                         if (copy_from_user(tbuf, bulk.data, len1)) {
 804                                 kfree(tbuf);
 805                                 return -EFAULT;
 806                         }
 807                 }
 808                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
 809                         bulk.len, bulk.timeout);
 810                 if (usbfs_snoop) {
 811                         dev_info(&dev->dev, "bulk write: data: ");
 812                         for (j = 0; j < len1; ++j)
 813                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 814                         printk("\n");
 815                 }
 816                 usb_unlock_device(dev);
 817                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 818                 usb_lock_device(dev);
 819         }
 820         kfree(tbuf);
 821         if (i < 0)
 822                 return i;
 823         return len2;
 824 }
 825
 826 static int proc_resetep(struct dev_state *ps, void __user *arg)
 827 {
 828         unsigned int ep;
 829         int ret;
 830
 831         if (get_user(ep, (unsigned int __user *)arg))
 832                 return -EFAULT;
 833         ret = findintfep(ps->dev, ep);
 834         if (ret < 0)
 835                 return ret;
 836         ret = checkintf(ps, ret);
 837         if (ret)
 838                 return ret;
 839         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
 840         return 0;
 841 }
 842
 843 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 844 {
 845         unsigned int ep;
 846         int pipe;
 847         int ret;
 848
 849         if (get_user(ep, (unsigned int __user *)arg))
 850                 return -EFAULT;
 851         ret = findintfep(ps->dev, ep);
 852         if (ret < 0)
 853                 return ret;
 854         ret = checkintf(ps, ret);
 855         if (ret)
 856                 return ret;
 857         if (ep & USB_DIR_IN)
 858                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 859         else
 860                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 861
 862         return usb_clear_halt(ps->dev, pipe);
 863 }
 864
 865 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 866 {
 867         struct usbdevfs_getdriver gd;
 868         struct usb_interface *intf;
 869         int ret;
 870
 871         if (copy_from_user(&gd, arg, sizeof(gd)))
 872                 return -EFAULT;
 873         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 874         if (!intf || !intf->dev.driver)
 875                 ret = -ENODATA;
 876         else {
 877                 strncpy(gd.driver, intf->dev.driver->name,
 878                                 sizeof(gd.driver));
 879                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 880         }
 881         return ret;
 882 }
 883
 884 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 885 {
 886         struct usbdevfs_connectinfo ci;
 887
 888         ci.devnum = ps->dev->devnum;
 889         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 890         if (copy_to_user(arg, &ci, sizeof(ci)))
 891                 return -EFAULT;
 892         return 0;
 893 }
 894
 895 static int proc_resetdevice(struct dev_state *ps)
 896 {
 897         return usb_reset_device(ps->dev);
 898 }
 899
 900 static int proc_setintf(struct dev_state *ps, void __user *arg)
 901 {
 902         struct usbdevfs_setinterface setintf;
 903         int ret;
 904
 905         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 906                 return -EFAULT;
 907         if ((ret = checkintf(ps, setintf.interface)))
 908                 return ret;
 909         return usb_set_interface(ps->dev, setintf.interface,
 910                         setintf.altsetting);
 911 }
 912
 913 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 914 {
 915         int u;
 916         int status = 0;
 917         struct usb_host_config *actconfig;
 918
 919         if (get_user(u, (int __user *)arg))
 920                 return -EFAULT;
 921
 922         actconfig = ps->dev->actconfig;
 923
 924         /* Don't touch the device if any interfaces are claimed.
 925          * It could interfere with other drivers' operations, and if
 926          * an interface is claimed by usbfs it could easily deadlock.
 927          */
 928         if (actconfig) {
 929                 int i;
 930
 931                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 932                         if (usb_interface_claimed(actconfig->interface[i])) {
 933                                 dev_warn(&ps->dev->dev,
 934                                         "usbfs: interface %d claimed by %s "
 935                                         "while '%s' sets config #%d\n",
 936                                         actconfig->interface[i]
 937                                                 ->cur_altsetting
 938                                                 ->desc.bInterfaceNumber,
 939                                         actconfig->interface[i]
 940                                                 ->dev.driver->name,
 941                                         current->comm, u);
 942                                 status = -EBUSY;
 943                                 break;
 944                         }
 945                 }
 946         }
 947
 948         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 949          * so avoid usb_set_configuration()'s kick to sysfs
 950          */
 951         if (status == 0) {
 952                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 953                         status = usb_reset_configuration(ps->dev);
 954                 else
 955                         status = usb_set_configuration(ps->dev, u);
 956         }
 957
 958         return status;
 959 }
 960
 961 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 962                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
 963                         void __user *arg)
 964 {
 965         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 966         struct usb_host_endpoint *ep;
 967         struct async *as;
 968         struct usb_ctrlrequest *dr = NULL;
 969         unsigned int u, totlen, isofrmlen;
 970         int ret, ifnum = -1;
 971         int is_in;
 972
 973         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
 974                                 USBDEVFS_URB_SHORT_NOT_OK |
 975                                 USBDEVFS_URB_NO_FSBR |
 976                                 USBDEVFS_URB_ZERO_PACKET |
 977                                 USBDEVFS_URB_NO_INTERRUPT))
 978                 return -EINVAL;
 979         if (!uurb->buffer)
 980                 return -EINVAL;
 981         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN ||
 982                                  uurb->signr > SIGRTMAX))
 983                 return -EINVAL;
 984         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
 985             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
 986                 ifnum = findintfep(ps->dev, uurb->endpoint);
 987                 if (ifnum < 0)
 988                         return ifnum;
 989                 ret = checkintf(ps, ifnum);
 990                 if (ret)
 991                         return ret;
 992         }
 993         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
 994                 is_in = 1;
 995                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 996         } else {
 997                 is_in = 0;
 998                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 999         }
1000         if (!ep)
1001                 return -ENOENT;
1002         switch(uurb->type) {
1003         case USBDEVFS_URB_TYPE_CONTROL:
1004                 if (!usb_endpoint_xfer_control(&ep->desc))
1005                         return -EINVAL;
1006                 /* min 8 byte setup packet,
1007                  * max 8 byte setup plus an arbitrary data stage */
1008                 if (uurb->buffer_length < 8 ||
1009                     uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1010                         return -EINVAL;
1011                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1012                 if (!dr)
1013                         return -ENOMEM;
1014                 if (copy_from_user(dr, uurb->buffer, 8)) {
1015                         kfree(dr);
1016                         return -EFAULT;
1017                 }
1018                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1019                         kfree(dr);
1020                         return -EINVAL;
1021                 }
1022                 ret = check_ctrlrecip(ps, dr->bRequestType,
1023                                       le16_to_cpup(&dr->wIndex));
1024                 if (ret) {
1025                         kfree(dr);
1026                         return ret;
1027                 }
1028                 uurb->number_of_packets = 0;
1029                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1030                 uurb->buffer += 8;
1031                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1032                         is_in = 1;
1033                         uurb->endpoint |= USB_DIR_IN;
1034                 } else {
1035                         is_in = 0;
1036                         uurb->endpoint &= ~USB_DIR_IN;
1037                 }
1038                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1039                                 uurb->buffer, uurb->buffer_length)) {
1040                         kfree(dr);
1041                         return -EFAULT;
1042                 }
1043                 snoop(&ps->dev->dev, "control urb: bRequest=%02x "
1044                         "bRrequestType=%02x wValue=%04x "
1045                         "wIndex=%04x wLength=%04x\n",
1046                         dr->bRequest, dr->bRequestType,
1047                         __le16_to_cpup(&dr->wValue),
1048                         __le16_to_cpup(&dr->wIndex),
1049                         __le16_to_cpup(&dr->wLength));
1050                 break;
1051
1052         case USBDEVFS_URB_TYPE_BULK:
1053                 switch (usb_endpoint_type(&ep->desc)) {
1054                 case USB_ENDPOINT_XFER_CONTROL:
1055                 case USB_ENDPOINT_XFER_ISOC:
1056                         return -EINVAL;
1057                 /* allow single-shot interrupt transfers, at bogus rates */
1058                 }
1059                 uurb->number_of_packets = 0;
1060                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1061                         return -EINVAL;
1062                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1063                                 uurb->buffer, uurb->buffer_length))
1064                         return -EFAULT;
1065                 snoop(&ps->dev->dev, "bulk urb\n");
1066                 break;
1067
1068         case USBDEVFS_URB_TYPE_ISO:
1069                 /* arbitrary limit */
1070                 if (uurb->number_of_packets < 1 ||
1071                     uurb->number_of_packets > 128)
1072                         return -EINVAL;
1073                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1074                         return -EINVAL;
1075                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1076                                    uurb->number_of_packets;
1077                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1078                         return -ENOMEM;
1079                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1080                         kfree(isopkt);
1081                         return -EFAULT;
1082                 }
1083                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1084                         /* arbitrary limit,
1085                          * sufficient for USB 2.0 high-bandwidth iso */
1086                         if (isopkt[u].length > 8192) {
1087                                 kfree(isopkt);
1088                                 return -EINVAL;
1089                         }
1090                         totlen += isopkt[u].length;
1091                 }
1092                 if (totlen > 32768) {
1093                         kfree(isopkt);
1094                         return -EINVAL;
1095                 }
1096                 uurb->buffer_length = totlen;
1097                 snoop(&ps->dev->dev, "iso urb\n");
1098                 break;
1099
1100         case USBDEVFS_URB_TYPE_INTERRUPT:
1101                 uurb->number_of_packets = 0;
1102                 if (!usb_endpoint_xfer_int(&ep->desc))
1103                         return -EINVAL;
1104                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1105                         return -EINVAL;
1106                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1107                                 uurb->buffer, uurb->buffer_length))
1108                         return -EFAULT;
1109                 snoop(&ps->dev->dev, "interrupt urb\n");
1110                 break;
1111
1112         default:
1113                 return -EINVAL;
1114         }
1115         as = alloc_async(uurb->number_of_packets);
1116         if (!as) {
1117                 kfree(isopkt);
1118                 kfree(dr);
1119                 return -ENOMEM;
1120         }
1121         as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL);
1122         if (!as->urb->transfer_buffer) {
1123                 kfree(isopkt);
1124                 kfree(dr);
1125                 free_async(as);
1126                 return -ENOMEM;
1127         }
1128         as->urb->dev = ps->dev;
1129         as->urb->pipe = (uurb->type << 30) |
1130                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1131                         (uurb->endpoint & USB_DIR_IN);
1132
1133         /* This tedious sequence is necessary because the URB_* flags
1134          * are internal to the kernel and subject to change, whereas
1135          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1136          */
1137         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1138         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1139                 u |= URB_ISO_ASAP;
1140         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1141                 u |= URB_SHORT_NOT_OK;
1142         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1143                 u |= URB_NO_FSBR;
1144         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1145                 u |= URB_ZERO_PACKET;
1146         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1147                 u |= URB_NO_INTERRUPT;
1148         as->urb->transfer_flags = u;
1149
1150         as->urb->transfer_buffer_length = uurb->buffer_length;
1151         as->urb->setup_packet = (unsigned char *)dr;
1152         as->urb->start_frame = uurb->start_frame;
1153         as->urb->number_of_packets = uurb->number_of_packets;
1154         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1155                         ps->dev->speed == USB_SPEED_HIGH)
1156                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1157         else
1158                 as->urb->interval = ep->desc.bInterval;
1159         as->urb->context = as;
1160         as->urb->complete = async_completed;
1161         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1162                 as->urb->iso_frame_desc[u].offset = totlen;
1163                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1164                 totlen += isopkt[u].length;
1165         }
1166         kfree(isopkt);
1167         as->ps = ps;
1168         as->userurb = arg;
1169         if (uurb->endpoint & USB_DIR_IN)
1170                 as->userbuffer = uurb->buffer;
1171         else
1172                 as->userbuffer = NULL;
1173         as->signr = uurb->signr;
1174         as->ifnum = ifnum;
1175         as->pid = get_pid(task_pid(current));
1176         as->uid = current->uid;
1177         as->euid = current->euid;
1178         security_task_getsecid(current, &as->secid);
1179         if (!is_in) {
1180                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1181                                 as->urb->transfer_buffer_length)) {
1182                         free_async(as);
1183                         return -EFAULT;
1184                 }
1185         }
1186         snoop_urb(as->urb, as->userurb);
1187         async_newpending(as);
1188         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1189                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1190                            "usbfs: usb_submit_urb returned %d\n", ret);
1191                 async_removepending(as);
1192                 free_async(as);
1193                 return ret;
1194         }
1195         return 0;
1196 }
1197
1198 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1199 {
1200         struct usbdevfs_urb uurb;
1201
1202         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1203                 return -EFAULT;
1204
1205         return proc_do_submiturb(ps, &uurb,
1206                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1207                         arg);
1208 }
1209
1210 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1211 {
1212         struct async *as;
1213
1214         as = async_getpending(ps, arg);
1215         if (!as)
1216                 return -EINVAL;
1217         usb_kill_urb(as->urb);
1218         return 0;
1219 }
1220
1221 static int processcompl(struct async *as, void __user * __user *arg)
1222 {
1223         struct urb *urb = as->urb;
1224         struct usbdevfs_urb __user *userurb = as->userurb;
1225         void __user *addr = as->userurb;
1226         unsigned int i;
1227
1228         if (as->userbuffer)
1229                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1230                                  urb->transfer_buffer_length))
1231                         return -EFAULT;
1232         if (put_user(as->status, &userurb->status))
1233                 return -EFAULT;
1234         if (put_user(urb->actual_length, &userurb->actual_length))
1235                 return -EFAULT;
1236         if (put_user(urb->error_count, &userurb->error_count))
1237                 return -EFAULT;
1238
1239         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1240                 for (i = 0; i < urb->number_of_packets; i++) {
1241                         if (put_user(urb->iso_frame_desc[i].actual_length,
1242                                      &userurb->iso_frame_desc[i].actual_length))
1243                                 return -EFAULT;
1244                         if (put_user(urb->iso_frame_desc[i].status,
1245                                      &userurb->iso_frame_desc[i].status))
1246                                 return -EFAULT;
1247                 }
1248         }
1249
1250         free_async(as);
1251
1252         if (put_user(addr, (void __user * __user *)arg))
1253                 return -EFAULT;
1254         return 0;
1255 }
1256
1257 static struct async *reap_as(struct dev_state *ps)
1258 {
1259         DECLARE_WAITQUEUE(wait, current);
1260         struct async *as = NULL;
1261         struct usb_device *dev = ps->dev;
1262
1263         add_wait_queue(&ps->wait, &wait);
1264         for (;;) {
1265                 __set_current_state(TASK_INTERRUPTIBLE);
1266                 as = async_getcompleted(ps);
1267                 if (as)
1268                         break;
1269                 if (signal_pending(current))
1270                         break;
1271                 usb_unlock_device(dev);
1272                 schedule();
1273                 usb_lock_device(dev);
1274         }
1275         remove_wait_queue(&ps->wait, &wait);
1276         set_current_state(TASK_RUNNING);
1277         return as;
1278 }
1279
1280 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1281 {
1282         struct async *as = reap_as(ps);
1283         if (as)
1284                 return processcompl(as, (void __user * __user *)arg);
1285         if (signal_pending(current))
1286                 return -EINTR;
1287         return -EIO;
1288 }
1289
1290 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1291 {
1292         struct async *as;
1293
1294         if (!(as = async_getcompleted(ps)))
1295                 return -EAGAIN;
1296         return processcompl(as, (void __user * __user *)arg);
1297 }
1298
1299 #ifdef CONFIG_COMPAT
1300
1301 static int get_urb32(struct usbdevfs_urb *kurb,
1302                      struct usbdevfs_urb32 __user *uurb)
1303 {
1304         __u32  uptr;
1305         if (get_user(kurb->type, &uurb->type) ||
1306             __get_user(kurb->endpoint, &uurb->endpoint) ||
1307             __get_user(kurb->status, &uurb->status) ||
1308             __get_user(kurb->flags, &uurb->flags) ||
1309             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1310             __get_user(kurb->actual_length, &uurb->actual_length) ||
1311             __get_user(kurb->start_frame, &uurb->start_frame) ||
1312             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1313             __get_user(kurb->error_count, &uurb->error_count) ||
1314             __get_user(kurb->signr, &uurb->signr))
1315                 return -EFAULT;
1316
1317         if (__get_user(uptr, &uurb->buffer))
1318                 return -EFAULT;
1319         kurb->buffer = compat_ptr(uptr);
1320         if (__get_user(uptr, &uurb->buffer))
1321                 return -EFAULT;
1322         kurb->usercontext = compat_ptr(uptr);
1323
1324         return 0;
1325 }
1326
1327 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1328 {
1329         struct usbdevfs_urb uurb;
1330
1331         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1332                 return -EFAULT;
1333
1334         return proc_do_submiturb(ps, &uurb,
1335                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1336                         arg);
1337 }
1338
1339 static int processcompl_compat(struct async *as, void __user * __user *arg)
1340 {
1341         struct urb *urb = as->urb;
1342         struct usbdevfs_urb32 __user *userurb = as->userurb;
1343         void __user *addr = as->userurb;
1344         unsigned int i;
1345
1346         if (as->userbuffer)
1347                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1348                                  urb->transfer_buffer_length))
1349                         return -EFAULT;
1350         if (put_user(as->status, &userurb->status))
1351                 return -EFAULT;
1352         if (put_user(urb->actual_length, &userurb->actual_length))
1353                 return -EFAULT;
1354         if (put_user(urb->error_count, &userurb->error_count))
1355                 return -EFAULT;
1356
1357         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1358                 for (i = 0; i < urb->number_of_packets; i++) {
1359                         if (put_user(urb->iso_frame_desc[i].actual_length,
1360                                      &userurb->iso_frame_desc[i].actual_length))
1361                                 return -EFAULT;
1362                         if (put_user(urb->iso_frame_desc[i].status,
1363                                      &userurb->iso_frame_desc[i].status))
1364                                 return -EFAULT;
1365                 }
1366         }
1367
1368         free_async(as);
1369         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1370                 return -EFAULT;
1371         return 0;
1372 }
1373
1374 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1375 {
1376         struct async *as = reap_as(ps);
1377         if (as)
1378                 return processcompl_compat(as, (void __user * __user *)arg);
1379         if (signal_pending(current))
1380                 return -EINTR;
1381         return -EIO;
1382 }
1383
1384 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1385 {
1386         struct async *as;
1387
1388         if (!(as = async_getcompleted(ps)))
1389                 return -EAGAIN;
1390         return processcompl_compat(as, (void __user * __user *)arg);
1391 }
1392
1393 #endif
1394
1395 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1396 {
1397         struct usbdevfs_disconnectsignal ds;
1398
1399         if (copy_from_user(&ds, arg, sizeof(ds)))
1400                 return -EFAULT;
1401         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1402                 return -EINVAL;
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 void usb_fs_classdev_common_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         usb_fs_classdev_common_remove(dev);
1748 }
1749
1750 static int usb_classdev_notify(struct notifier_block *self,
1751                                unsigned long action, void *dev)
1752 {
1753         switch (action) {
1754         case USB_DEVICE_ADD:
1755                 if (usb_classdev_add(dev))
1756                         return NOTIFY_BAD;
1757                 break;
1758         case USB_DEVICE_REMOVE:
1759                 usb_classdev_remove(dev);
1760                 break;
1761         }
1762         return NOTIFY_OK;
1763 }
1764
1765 static struct notifier_block usbdev_nb = {
1766         .notifier_call =        usb_classdev_notify,
1767 };
1768 #endif
1769
1770 static struct cdev usb_device_cdev;
1771
1772 int __init usb_devio_init(void)
1773 {
1774         int retval;
1775
1776         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1777                                         "usb_device");
1778         if (retval) {
1779                 err("unable to register minors for usb_device");
1780                 goto out;
1781         }
1782         cdev_init(&usb_device_cdev, &usbdev_file_operations);
1783         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1784         if (retval) {
1785                 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1786                 goto error_cdev;
1787         }
1788 #ifdef CONFIG_USB_DEVICE_CLASS
1789         usb_classdev_class = class_create(THIS_MODULE, "usb_device");
1790         if (IS_ERR(usb_classdev_class)) {
1791                 err("unable to register usb_device class");
1792                 retval = PTR_ERR(usb_classdev_class);
1793                 cdev_del(&usb_device_cdev);
1794                 usb_classdev_class = NULL;
1795                 goto out;
1796         }
1797         /* devices of this class shadow the major:minor of their parent
1798          * device, so clear ->dev_kobj to prevent adding duplicate entries
1799          * to /sys/dev
1800          */
1801         usb_classdev_class->dev_kobj = NULL;
1802
1803         usb_register_notify(&usbdev_nb);
1804 #endif
1805 out:
1806         return retval;
1807
1808 error_cdev:
1809         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1810         goto out;
1811 }
1812
1813 void usb_devio_cleanup(void)
1814 {
1815 #ifdef CONFIG_USB_DEVICE_CLASS
1816         usb_unregister_notify(&usbdev_nb);
1817         class_destroy(usb_classdev_class);
1818 #endif
1819         cdev_del(&usb_device_cdev);
1820         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1821 }