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