git.oblomov.eu Git - linux-2.6/blob - 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 async {
  63         struct list_head asynclist;
  64         struct dev_state *ps;
  65         struct pid *pid;
  66         uid_t uid, euid;
  67         unsigned int signr;
  68         unsigned int ifnum;
  69         void __user *userbuffer;
  70         void __user *userurb;
  71         struct urb *urb;
  72         int status;
  73         u32 secid;
  74 };
  75
  76 static int usbfs_snoop;
  77 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  78 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
  79
  80 #define snoop(dev, format, arg...)                              \
  81         do {                                                    \
  82                 if (usbfs_snoop)                                \
  83                         dev_info(dev , format , ## arg);        \
  84         } while (0)
  85
  86 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
  87
  88
  89 #define MAX_USBFS_BUFFER_SIZE   16384
  90
  91 static inline int connected(struct dev_state *ps)
  92 {
  93         return (!list_empty(&ps->list) &&
  94                         ps->dev->state != USB_STATE_NOTATTACHED);
  95 }
  96
  97 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
  98 {
  99         loff_t ret;
 100
 101         lock_kernel();
 102
 103         switch (orig) {
 104         case 0:
 105                 file->f_pos = offset;
 106                 ret = file->f_pos;
 107                 break;
 108         case 1:
 109                 file->f_pos += offset;
 110                 ret = file->f_pos;
 111                 break;
 112         case 2:
 113         default:
 114                 ret = -EINVAL;
 115         }
 116
 117         unlock_kernel();
 118         return ret;
 119 }
 120
 121 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 122                            loff_t *ppos)
 123 {
 124         struct dev_state *ps = file->private_data;
 125         struct usb_device *dev = ps->dev;
 126         ssize_t ret = 0;
 127         unsigned len;
 128         loff_t pos;
 129         int i;
 130
 131         pos = *ppos;
 132         usb_lock_device(dev);
 133         if (!connected(ps)) {
 134                 ret = -ENODEV;
 135                 goto err;
 136         } else if (pos < 0) {
 137                 ret = -EINVAL;
 138                 goto err;
 139         }
 140
 141         if (pos < sizeof(struct usb_device_descriptor)) {
 142                 /* 18 bytes - fits on the stack */
 143                 struct usb_device_descriptor temp_desc;
 144
 145                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 146                 le16_to_cpus(&temp_desc.bcdUSB);
 147                 le16_to_cpus(&temp_desc.idVendor);
 148                 le16_to_cpus(&temp_desc.idProduct);
 149                 le16_to_cpus(&temp_desc.bcdDevice);
 150
 151                 len = sizeof(struct usb_device_descriptor) - pos;
 152                 if (len > nbytes)
 153                         len = nbytes;
 154                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 155                         ret = -EFAULT;
 156                         goto err;
 157                 }
 158
 159                 *ppos += len;
 160                 buf += len;
 161                 nbytes -= len;
 162                 ret += len;
 163         }
 164
 165         pos = sizeof(struct usb_device_descriptor);
 166         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 167                 struct usb_config_descriptor *config =
 168                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 169                 unsigned int length = le16_to_cpu(config->wTotalLength);
 170
 171                 if (*ppos < pos + length) {
 172
 173                         /* The descriptor may claim to be longer than it
 174                          * really is.  Here is the actual allocated length. */
 175                         unsigned alloclen =
 176                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 177
 178                         len = length - (*ppos - pos);
 179                         if (len > nbytes)
 180                                 len = nbytes;
 181
 182                         /* Simply don't write (skip over) unallocated parts */
 183                         if (alloclen > (*ppos - pos)) {
 184                                 alloclen -= (*ppos - pos);
 185                                 if (copy_to_user(buf,
 186                                     dev->rawdescriptors[i] + (*ppos - pos),
 187                                     min(len, alloclen))) {
 188                                         ret = -EFAULT;
 189                                         goto err;
 190                                 }
 191                         }
 192
 193                         *ppos += len;
 194                         buf += len;
 195                         nbytes -= len;
 196                         ret += len;
 197                 }
 198
 199                 pos += length;
 200         }
 201
 202 err:
 203         usb_unlock_device(dev);
 204         return ret;
 205 }
 206
 207 /*
 208  * async list handling
 209  */
 210
 211 static struct async *alloc_async(unsigned int numisoframes)
 212 {
 213         struct async *as;
 214
 215         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 216         if (!as)
 217                 return NULL;
 218         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 219         if (!as->urb) {
 220                 kfree(as);
 221                 return NULL;
 222         }
 223         return as;
 224 }
 225
 226 static void free_async(struct async *as)
 227 {
 228         put_pid(as->pid);
 229         kfree(as->urb->transfer_buffer);
 230         kfree(as->urb->setup_packet);
 231         usb_free_urb(as->urb);
 232         kfree(as);
 233 }
 234
 235 static inline void async_newpending(struct async *as)
 236 {
 237         struct dev_state *ps = as->ps;
 238         unsigned long flags;
 239
 240         spin_lock_irqsave(&ps->lock, flags);
 241         list_add_tail(&as->asynclist, &ps->async_pending);
 242         spin_unlock_irqrestore(&ps->lock, flags);
 243 }
 244
 245 static inline void async_removepending(struct async *as)
 246 {
 247         struct dev_state *ps = as->ps;
 248         unsigned long flags;
 249
 250         spin_lock_irqsave(&ps->lock, flags);
 251         list_del_init(&as->asynclist);
 252         spin_unlock_irqrestore(&ps->lock, flags);
 253 }
 254
 255 static inline struct async *async_getcompleted(struct dev_state *ps)
 256 {
 257         unsigned long flags;
 258         struct async *as = NULL;
 259
 260         spin_lock_irqsave(&ps->lock, flags);
 261         if (!list_empty(&ps->async_completed)) {
 262                 as = list_entry(ps->async_completed.next, struct async,
 263                                 asynclist);
 264                 list_del_init(&as->asynclist);
 265         }
 266         spin_unlock_irqrestore(&ps->lock, flags);
 267         return as;
 268 }
 269
 270 static inline struct async *async_getpending(struct dev_state *ps,
 271                                              void __user *userurb)
 272 {
 273         unsigned long flags;
 274         struct async *as;
 275
 276         spin_lock_irqsave(&ps->lock, flags);
 277         list_for_each_entry(as, &ps->async_pending, asynclist)
 278                 if (as->userurb == userurb) {
 279                         list_del_init(&as->asynclist);
 280                         spin_unlock_irqrestore(&ps->lock, flags);
 281                         return as;
 282                 }
 283         spin_unlock_irqrestore(&ps->lock, flags);
 284         return NULL;
 285 }
 286
 287 static void snoop_urb(struct urb *urb, void __user *userurb)
 288 {
 289         int j;
 290         unsigned char *data = urb->transfer_buffer;
 291
 292         if (!usbfs_snoop)
 293                 return;
 294
 295         dev_info(&urb->dev->dev, "direction=%s\n",
 296                         usb_urb_dir_in(urb) ? "IN" : "OUT");
 297         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
 298         dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
 299                  urb->transfer_buffer_length);
 300         dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
 301         dev_info(&urb->dev->dev, "data: ");
 302         for (j = 0; j < urb->transfer_buffer_length; ++j)
 303                 printk("%02x ", data[j]);
 304         printk("\n");
 305 }
 306
 307 static void async_completed(struct urb *urb)
 308 {
 309         struct async *as = urb->context;
 310         struct dev_state *ps = as->ps;
 311         struct siginfo sinfo;
 312
 313         spin_lock(&ps->lock);
 314         list_move_tail(&as->asynclist, &ps->async_completed);
 315         spin_unlock(&ps->lock);
 316         as->status = urb->status;
 317         if (as->signr) {
 318                 sinfo.si_signo = as->signr;
 319                 sinfo.si_errno = as->status;
 320                 sinfo.si_code = SI_ASYNCIO;
 321                 sinfo.si_addr = as->userurb;
 322                 kill_pid_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
 323                                       as->euid, as->secid);
 324         }
 325         snoop(&urb->dev->dev, "urb complete\n");
 326         snoop_urb(urb, as->userurb);
 327         wake_up(&ps->wait);
 328 }
 329
 330 static void destroy_async(struct dev_state *ps, struct list_head *list)
 331 {
 332         struct async *as;
 333         unsigned long flags;
 334
 335         spin_lock_irqsave(&ps->lock, flags);
 336         while (!list_empty(list)) {
 337                 as = list_entry(list->next, struct async, asynclist);
 338                 list_del_init(&as->asynclist);
 339
 340                 /* drop the spinlock so the completion handler can run */
 341                 spin_unlock_irqrestore(&ps->lock, flags);
 342                 usb_kill_urb(as->urb);
 343                 spin_lock_irqsave(&ps->lock, flags);
 344         }
 345         spin_unlock_irqrestore(&ps->lock, flags);
 346         as = async_getcompleted(ps);
 347         while (as) {
 348                 free_async(as);
 349                 as = async_getcompleted(ps);
 350         }
 351 }
 352
 353 static void destroy_async_on_interface(struct dev_state *ps,
 354                                        unsigned int ifnum)
 355 {
 356         struct list_head *p, *q, hitlist;
 357         unsigned long flags;
 358
 359         INIT_LIST_HEAD(&hitlist);
 360         spin_lock_irqsave(&ps->lock, flags);
 361         list_for_each_safe(p, q, &ps->async_pending)
 362                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 363                         list_move_tail(p, &hitlist);
 364         spin_unlock_irqrestore(&ps->lock, flags);
 365         destroy_async(ps, &hitlist);
 366 }
 367
 368 static inline void destroy_all_async(struct dev_state *ps)
 369 {
 370         destroy_async(ps, &ps->async_pending);
 371 }
 372
 373 /*
 374  * interface claims are made only at the request of user level code,
 375  * which can also release them (explicitly or by closing files).
 376  * they're also undone when devices disconnect.
 377  */
 378
 379 static int driver_probe(struct usb_interface *intf,
 380                         const struct usb_device_id *id)
 381 {
 382         return -ENODEV;
 383 }
 384
 385 static void driver_disconnect(struct usb_interface *intf)
 386 {
 387         struct dev_state *ps = usb_get_intfdata(intf);
 388         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 389
 390         if (!ps)
 391                 return;
 392
 393         /* NOTE:  this relies on usbcore having canceled and completed
 394          * all pending I/O requests; 2.6 does that.
 395          */
 396
 397         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 398                 clear_bit(ifnum, &ps->ifclaimed);
 399         else
 400                 warn("interface number %u out of range", ifnum);
 401
 402         usb_set_intfdata(intf, NULL);
 403
 404         /* force async requests to complete */
 405         destroy_async_on_interface(ps, ifnum);
 406 }
 407
 408 /* The following routines are merely placeholders.  There is no way
 409  * to inform a user task about suspend or resumes.
 410  */
 411 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 412 {
 413         return 0;
 414 }
 415
 416 static int driver_resume(struct usb_interface *intf)
 417 {
 418         return 0;
 419 }
 420
 421 struct usb_driver usbfs_driver = {
 422         .name =         "usbfs",
 423         .probe =        driver_probe,
 424         .disconnect =   driver_disconnect,
 425         .suspend =      driver_suspend,
 426         .resume =       driver_resume,
 427 };
 428
 429 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 430 {
 431         struct usb_device *dev = ps->dev;
 432         struct usb_interface *intf;
 433         int err;
 434
 435         if (ifnum >= 8*sizeof(ps->ifclaimed))
 436                 return -EINVAL;
 437         /* already claimed */
 438         if (test_bit(ifnum, &ps->ifclaimed))
 439                 return 0;
 440
 441         intf = usb_ifnum_to_if(dev, ifnum);
 442         if (!intf)
 443                 err = -ENOENT;
 444         else
 445                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 446         if (err == 0)
 447                 set_bit(ifnum, &ps->ifclaimed);
 448         return err;
 449 }
 450
 451 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 452 {
 453         struct usb_device *dev;
 454         struct usb_interface *intf;
 455         int err;
 456
 457         err = -EINVAL;
 458         if (ifnum >= 8*sizeof(ps->ifclaimed))
 459                 return err;
 460         dev = ps->dev;
 461         intf = usb_ifnum_to_if(dev, ifnum);
 462         if (!intf)
 463                 err = -ENOENT;
 464         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 465                 usb_driver_release_interface(&usbfs_driver, intf);
 466                 err = 0;
 467         }
 468         return err;
 469 }
 470
 471 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 472 {
 473         if (ps->dev->state != USB_STATE_CONFIGURED)
 474                 return -EHOSTUNREACH;
 475         if (ifnum >= 8*sizeof(ps->ifclaimed))
 476                 return -EINVAL;
 477         if (test_bit(ifnum, &ps->ifclaimed))
 478                 return 0;
 479         /* if not yet claimed, claim it for the driver */
 480         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 481                  "interface %u before use\n", task_pid_nr(current),
 482                  current->comm, ifnum);
 483         return claimintf(ps, ifnum);
 484 }
 485
 486 static int findintfep(struct usb_device *dev, unsigned int ep)
 487 {
 488         unsigned int i, j, e;
 489         struct usb_interface *intf;
 490         struct usb_host_interface *alts;
 491         struct usb_endpoint_descriptor *endpt;
 492
 493         if (ep & ~(USB_DIR_IN|0xf))
 494                 return -EINVAL;
 495         if (!dev->actconfig)
 496                 return -ESRCH;
 497         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 498                 intf = dev->actconfig->interface[i];
 499                 for (j = 0; j < intf->num_altsetting; j++) {
 500                         alts = &intf->altsetting[j];
 501                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 502                                 endpt = &alts->endpoint[e].desc;
 503                                 if (endpt->bEndpointAddress == ep)
 504                                         return alts->desc.bInterfaceNumber;
 505                         }
 506                 }
 507         }
 508         return -ENOENT;
 509 }
 510
 511 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
 512                            unsigned int index)
 513 {
 514         int ret = 0;
 515
 516         if (ps->dev->state != USB_STATE_ADDRESS
 517          && ps->dev->state != USB_STATE_CONFIGURED)
 518                 return -EHOSTUNREACH;
 519         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 520                 return 0;
 521
 522         index &= 0xff;
 523         switch (requesttype & USB_RECIP_MASK) {
 524         case USB_RECIP_ENDPOINT:
 525                 ret = findintfep(ps->dev, index);
 526                 if (ret >= 0)
 527                         ret = checkintf(ps, ret);
 528                 break;
 529
 530         case USB_RECIP_INTERFACE:
 531                 ret = checkintf(ps, index);
 532                 break;
 533         }
 534         return ret;
 535 }
 536
 537 static int __match_minor(struct device *dev, void *data)
 538 {
 539         int minor = *((int *)data);
 540
 541         if (dev->devt == MKDEV(USB_DEVICE_MAJOR, minor))
 542                 return 1;
 543         return 0;
 544 }
 545
 546 static struct usb_device *usbdev_lookup_by_minor(int minor)
 547 {
 548         struct device *dev;
 549
 550         dev = bus_find_device(&usb_bus_type, NULL, &minor, __match_minor);
 551         if (!dev)
 552                 return NULL;
 553         put_device(dev);
 554         return container_of(dev, struct usb_device, dev);
 555 }
 556
 557 /*
 558  * file operations
 559  */
 560 static int usbdev_open(struct inode *inode, struct file *file)
 561 {
 562         struct usb_device *dev = NULL;
 563         struct dev_state *ps;
 564         int ret;
 565
 566         lock_kernel();
 567         /* Protect against simultaneous removal or release */
 568         mutex_lock(&usbfs_mutex);
 569
 570         ret = -ENOMEM;
 571         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
 572         if (!ps)
 573                 goto out;
 574
 575         ret = -ENOENT;
 576         /* usbdev device-node */
 577         if (imajor(inode) == USB_DEVICE_MAJOR)
 578                 dev = usbdev_lookup_by_minor(iminor(inode));
 579 #ifdef CONFIG_USB_DEVICEFS
 580         /* procfs file */
 581         if (!dev)
 582                 dev = inode->i_private;
 583 #endif
 584         if (!dev)
 585                 goto out;
 586         ret = usb_autoresume_device(dev);
 587         if (ret)
 588                 goto out;
 589
 590         usb_get_dev(dev);
 591         ret = 0;
 592         ps->dev = dev;
 593         ps->file = file;
 594         spin_lock_init(&ps->lock);
 595         INIT_LIST_HEAD(&ps->list);
 596         INIT_LIST_HEAD(&ps->async_pending);
 597         INIT_LIST_HEAD(&ps->async_completed);
 598         init_waitqueue_head(&ps->wait);
 599         ps->discsignr = 0;
 600         ps->disc_pid = get_pid(task_pid(current));
 601         ps->disc_uid = current->uid;
 602         ps->disc_euid = current->euid;
 603         ps->disccontext = NULL;
 604         ps->ifclaimed = 0;
 605         security_task_getsecid(current, &ps->secid);
 606         smp_wmb();
 607         list_add_tail(&ps->list, &dev->filelist);
 608         file->private_data = ps;
 609  out:
 610         if (ret)
 611                 kfree(ps);
 612         mutex_unlock(&usbfs_mutex);
 613         unlock_kernel();
 614         return ret;
 615 }
 616
 617 static int usbdev_release(struct inode *inode, struct file *file)
 618 {
 619         struct dev_state *ps = file->private_data;
 620         struct usb_device *dev = ps->dev;
 621         unsigned int ifnum;
 622
 623         usb_lock_device(dev);
 624
 625         /* Protect against simultaneous open */
 626         mutex_lock(&usbfs_mutex);
 627         list_del_init(&ps->list);
 628         mutex_unlock(&usbfs_mutex);
 629
 630         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 631                         ifnum++) {
 632                 if (test_bit(ifnum, &ps->ifclaimed))
 633                         releaseintf(ps, ifnum);
 634         }
 635         destroy_all_async(ps);
 636         usb_autosuspend_device(dev);
 637         usb_unlock_device(dev);
 638         usb_put_dev(dev);
 639         put_pid(ps->disc_pid);
 640         kfree(ps);
 641         return 0;
 642 }
 643
 644 static int proc_control(struct dev_state *ps, void __user *arg)
 645 {
 646         struct usb_device *dev = ps->dev;
 647         struct usbdevfs_ctrltransfer ctrl;
 648         unsigned int tmo;
 649         unsigned char *tbuf;
 650         unsigned wLength;
 651         int i, j, ret;
 652
 653         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 654                 return -EFAULT;
 655         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
 656         if (ret)
 657                 return ret;
 658         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
 659         if (wLength > PAGE_SIZE)
 660                 return -EINVAL;
 661         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
 662         if (!tbuf)
 663                 return -ENOMEM;
 664         tmo = ctrl.timeout;
 665         if (ctrl.bRequestType & 0x80) {
 666                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
 667                                                ctrl.wLength)) {
 668                         free_page((unsigned long)tbuf);
 669                         return -EINVAL;
 670                 }
 671                 snoop(&dev->dev, "control read: bRequest=%02x "
 672                                 "bRrequestType=%02x wValue=%04x "
 673                                 "wIndex=%04x wLength=%04x\n",
 674                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 675                                 ctrl.wIndex, ctrl.wLength);
 676
 677                 usb_unlock_device(dev);
 678                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest,
 679                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 680                                     tbuf, ctrl.wLength, tmo);
 681                 usb_lock_device(dev);
 682                 if ((i > 0) && ctrl.wLength) {
 683                         if (usbfs_snoop) {
 684                                 dev_info(&dev->dev, "control read: data ");
 685                                 for (j = 0; j < i; ++j)
 686                                         printk("%02x ", (u8)(tbuf)[j]);
 687                                 printk("\n");
 688                         }
 689                         if (copy_to_user(ctrl.data, tbuf, i)) {
 690                                 free_page((unsigned long)tbuf);
 691                                 return -EFAULT;
 692                         }
 693                 }
 694         } else {
 695                 if (ctrl.wLength) {
 696                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 697                                 free_page((unsigned long)tbuf);
 698                                 return -EFAULT;
 699                         }
 700                 }
 701                 snoop(&dev->dev, "control write: bRequest=%02x "
 702                                 "bRrequestType=%02x wValue=%04x "
 703                                 "wIndex=%04x wLength=%04x\n",
 704                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 705                                 ctrl.wIndex, ctrl.wLength);
 706                 if (usbfs_snoop) {
 707                         dev_info(&dev->dev, "control write: data: ");
 708                         for (j = 0; j < ctrl.wLength; ++j)
 709                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 710                         printk("\n");
 711                 }
 712                 usb_unlock_device(dev);
 713                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
 714                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 715                                     tbuf, ctrl.wLength, tmo);
 716                 usb_lock_device(dev);
 717         }
 718         free_page((unsigned long)tbuf);
 719         if (i < 0 && i != -EPIPE) {
 720                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 721                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 722                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 723                            ctrl.wLength, i);
 724         }
 725         return i;
 726 }
 727
 728 static int proc_bulk(struct dev_state *ps, void __user *arg)
 729 {
 730         struct usb_device *dev = ps->dev;
 731         struct usbdevfs_bulktransfer bulk;
 732         unsigned int tmo, len1, pipe;
 733         int len2;
 734         unsigned char *tbuf;
 735         int i, j, ret;
 736
 737         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 738                 return -EFAULT;
 739         ret = findintfep(ps->dev, bulk.ep);
 740         if (ret < 0)
 741                 return ret;
 742         ret = checkintf(ps, ret);
 743         if (ret)
 744                 return ret;
 745         if (bulk.ep & USB_DIR_IN)
 746                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 747         else
 748                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 749         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 750                 return -EINVAL;
 751         len1 = bulk.len;
 752         if (len1 > MAX_USBFS_BUFFER_SIZE)
 753                 return -EINVAL;
 754         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 755                 return -ENOMEM;
 756         tmo = bulk.timeout;
 757         if (bulk.ep & 0x80) {
 758                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 759                         kfree(tbuf);
 760                         return -EINVAL;
 761                 }
 762                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
 763                         bulk.len, bulk.timeout);
 764                 usb_unlock_device(dev);
 765                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 766                 usb_lock_device(dev);
 767                 if (!i && len2) {
 768                         if (usbfs_snoop) {
 769                                 dev_info(&dev->dev, "bulk read: data ");
 770                                 for (j = 0; j < len2; ++j)
 771                                         printk("%02x ", (u8)(tbuf)[j]);
 772                                 printk("\n");
 773                         }
 774                         if (copy_to_user(bulk.data, tbuf, len2)) {
 775                                 kfree(tbuf);
 776                                 return -EFAULT;
 777                         }
 778                 }
 779         } else {
 780                 if (len1) {
 781                         if (copy_from_user(tbuf, bulk.data, len1)) {
 782                                 kfree(tbuf);
 783                                 return -EFAULT;
 784                         }
 785                 }
 786                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
 787                         bulk.len, bulk.timeout);
 788                 if (usbfs_snoop) {
 789                         dev_info(&dev->dev, "bulk write: data: ");
 790                         for (j = 0; j < len1; ++j)
 791                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 792                         printk("\n");
 793                 }
 794                 usb_unlock_device(dev);
 795                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 796                 usb_lock_device(dev);
 797         }
 798         kfree(tbuf);
 799         if (i < 0)
 800                 return i;
 801         return len2;
 802 }
 803
 804 static int proc_resetep(struct dev_state *ps, void __user *arg)
 805 {
 806         unsigned int ep;
 807         int ret;
 808
 809         if (get_user(ep, (unsigned int __user *)arg))
 810                 return -EFAULT;
 811         ret = findintfep(ps->dev, ep);
 812         if (ret < 0)
 813                 return ret;
 814         ret = checkintf(ps, ret);
 815         if (ret)
 816                 return ret;
 817         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
 818         return 0;
 819 }
 820
 821 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 822 {
 823         unsigned int ep;
 824         int pipe;
 825         int ret;
 826
 827         if (get_user(ep, (unsigned int __user *)arg))
 828                 return -EFAULT;
 829         ret = findintfep(ps->dev, ep);
 830         if (ret < 0)
 831                 return ret;
 832         ret = checkintf(ps, ret);
 833         if (ret)
 834                 return ret;
 835         if (ep & USB_DIR_IN)
 836                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 837         else
 838                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 839
 840         return usb_clear_halt(ps->dev, pipe);
 841 }
 842
 843 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 844 {
 845         struct usbdevfs_getdriver gd;
 846         struct usb_interface *intf;
 847         int ret;
 848
 849         if (copy_from_user(&gd, arg, sizeof(gd)))
 850                 return -EFAULT;
 851         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 852         if (!intf || !intf->dev.driver)
 853                 ret = -ENODATA;
 854         else {
 855                 strncpy(gd.driver, intf->dev.driver->name,
 856                                 sizeof(gd.driver));
 857                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 858         }
 859         return ret;
 860 }
 861
 862 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 863 {
 864         struct usbdevfs_connectinfo ci;
 865
 866         ci.devnum = ps->dev->devnum;
 867         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 868         if (copy_to_user(arg, &ci, sizeof(ci)))
 869                 return -EFAULT;
 870         return 0;
 871 }
 872
 873 static int proc_resetdevice(struct dev_state *ps)
 874 {
 875         return usb_reset_composite_device(ps->dev);
 876 }
 877
 878 static int proc_setintf(struct dev_state *ps, void __user *arg)
 879 {
 880         struct usbdevfs_setinterface setintf;
 881         int ret;
 882
 883         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 884                 return -EFAULT;
 885         if ((ret = checkintf(ps, setintf.interface)))
 886                 return ret;
 887         return usb_set_interface(ps->dev, setintf.interface,
 888                         setintf.altsetting);
 889 }
 890
 891 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 892 {
 893         int u;
 894         int status = 0;
 895         struct usb_host_config *actconfig;
 896
 897         if (get_user(u, (int __user *)arg))
 898                 return -EFAULT;
 899
 900         actconfig = ps->dev->actconfig;
 901
 902         /* Don't touch the device if any interfaces are claimed.
 903          * It could interfere with other drivers' operations, and if
 904          * an interface is claimed by usbfs it could easily deadlock.
 905          */
 906         if (actconfig) {
 907                 int i;
 908
 909                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 910                         if (usb_interface_claimed(actconfig->interface[i])) {
 911                                 dev_warn(&ps->dev->dev,
 912                                         "usbfs: interface %d claimed by %s "
 913                                         "while '%s' sets config #%d\n",
 914                                         actconfig->interface[i]
 915                                                 ->cur_altsetting
 916                                                 ->desc.bInterfaceNumber,
 917                                         actconfig->interface[i]
 918                                                 ->dev.driver->name,
 919                                         current->comm, u);
 920                                 status = -EBUSY;
 921                                 break;
 922                         }
 923                 }
 924         }
 925
 926         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 927          * so avoid usb_set_configuration()'s kick to sysfs
 928          */
 929         if (status == 0) {
 930                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 931                         status = usb_reset_configuration(ps->dev);
 932                 else
 933                         status = usb_set_configuration(ps->dev, u);
 934         }
 935
 936         return status;
 937 }
 938
 939 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 940                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
 941                         void __user *arg)
 942 {
 943         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 944         struct usb_host_endpoint *ep;
 945         struct async *as;
 946         struct usb_ctrlrequest *dr = NULL;
 947         unsigned int u, totlen, isofrmlen;
 948         int ret, ifnum = -1;
 949         int is_in;
 950
 951         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
 952                                 USBDEVFS_URB_SHORT_NOT_OK |
 953                                 USBDEVFS_URB_NO_FSBR |
 954                                 USBDEVFS_URB_ZERO_PACKET |
 955                                 USBDEVFS_URB_NO_INTERRUPT))
 956                 return -EINVAL;
 957         if (!uurb->buffer)
 958                 return -EINVAL;
 959         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN ||
 960                                  uurb->signr > SIGRTMAX))
 961                 return -EINVAL;
 962         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
 963             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
 964                 ifnum = findintfep(ps->dev, uurb->endpoint);
 965                 if (ifnum < 0)
 966                         return ifnum;
 967                 ret = checkintf(ps, ifnum);
 968                 if (ret)
 969                         return ret;
 970         }
 971         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
 972                 is_in = 1;
 973                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 974         } else {
 975                 is_in = 0;
 976                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 977         }
 978         if (!ep)
 979                 return -ENOENT;
 980         switch(uurb->type) {
 981         case USBDEVFS_URB_TYPE_CONTROL:
 982                 if (!usb_endpoint_xfer_control(&ep->desc))
 983                         return -EINVAL;
 984                 /* min 8 byte setup packet,
 985                  * max 8 byte setup plus an arbitrary data stage */
 986                 if (uurb->buffer_length < 8 ||
 987                     uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
 988                         return -EINVAL;
 989                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
 990                 if (!dr)
 991                         return -ENOMEM;
 992                 if (copy_from_user(dr, uurb->buffer, 8)) {
 993                         kfree(dr);
 994                         return -EFAULT;
 995                 }
 996                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
 997                         kfree(dr);
 998                         return -EINVAL;
 999                 }
1000                 ret = check_ctrlrecip(ps, dr->bRequestType,
1001                                       le16_to_cpup(&dr->wIndex));
1002                 if (ret) {
1003                         kfree(dr);
1004                         return ret;
1005                 }
1006                 uurb->number_of_packets = 0;
1007                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1008                 uurb->buffer += 8;
1009                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1010                         is_in = 1;
1011                         uurb->endpoint |= USB_DIR_IN;
1012                 } else {
1013                         is_in = 0;
1014                         uurb->endpoint &= ~USB_DIR_IN;
1015                 }
1016                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1017                                 uurb->buffer, uurb->buffer_length)) {
1018                         kfree(dr);
1019                         return -EFAULT;
1020                 }
1021                 snoop(&ps->dev->dev, "control urb: bRequest=%02x "
1022                         "bRrequestType=%02x wValue=%04x "
1023                         "wIndex=%04x wLength=%04x\n",
1024                         dr->bRequest, dr->bRequestType,
1025                         __le16_to_cpup(&dr->wValue),
1026                         __le16_to_cpup(&dr->wIndex),
1027                         __le16_to_cpup(&dr->wLength));
1028                 break;
1029
1030         case USBDEVFS_URB_TYPE_BULK:
1031                 switch (usb_endpoint_type(&ep->desc)) {
1032                 case USB_ENDPOINT_XFER_CONTROL:
1033                 case USB_ENDPOINT_XFER_ISOC:
1034                         return -EINVAL;
1035                 /* allow single-shot interrupt transfers, at bogus rates */
1036                 }
1037                 uurb->number_of_packets = 0;
1038                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1039                         return -EINVAL;
1040                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1041                                 uurb->buffer, uurb->buffer_length))
1042                         return -EFAULT;
1043                 snoop(&ps->dev->dev, "bulk urb\n");
1044                 break;
1045
1046         case USBDEVFS_URB_TYPE_ISO:
1047                 /* arbitrary limit */
1048                 if (uurb->number_of_packets < 1 ||
1049                     uurb->number_of_packets > 128)
1050                         return -EINVAL;
1051                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1052                         return -EINVAL;
1053                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1054                                    uurb->number_of_packets;
1055                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1056                         return -ENOMEM;
1057                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1058                         kfree(isopkt);
1059                         return -EFAULT;
1060                 }
1061                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1062                         /* arbitrary limit,
1063                          * sufficient for USB 2.0 high-bandwidth iso */
1064                         if (isopkt[u].length > 8192) {
1065                                 kfree(isopkt);
1066                                 return -EINVAL;
1067                         }
1068                         totlen += isopkt[u].length;
1069                 }
1070                 if (totlen > 32768) {
1071                         kfree(isopkt);
1072                         return -EINVAL;
1073                 }
1074                 uurb->buffer_length = totlen;
1075                 snoop(&ps->dev->dev, "iso urb\n");
1076                 break;
1077
1078         case USBDEVFS_URB_TYPE_INTERRUPT:
1079                 uurb->number_of_packets = 0;
1080                 if (!usb_endpoint_xfer_int(&ep->desc))
1081                         return -EINVAL;
1082                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1083                         return -EINVAL;
1084                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1085                                 uurb->buffer, uurb->buffer_length))
1086                         return -EFAULT;
1087                 snoop(&ps->dev->dev, "interrupt urb\n");
1088                 break;
1089
1090         default:
1091                 return -EINVAL;
1092         }
1093         as = alloc_async(uurb->number_of_packets);
1094         if (!as) {
1095                 kfree(isopkt);
1096                 kfree(dr);
1097                 return -ENOMEM;
1098         }
1099         as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL);
1100         if (!as->urb->transfer_buffer) {
1101                 kfree(isopkt);
1102                 kfree(dr);
1103                 free_async(as);
1104                 return -ENOMEM;
1105         }
1106         as->urb->dev = ps->dev;
1107         as->urb->pipe = (uurb->type << 30) |
1108                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1109                         (uurb->endpoint & USB_DIR_IN);
1110
1111         /* This tedious sequence is necessary because the URB_* flags
1112          * are internal to the kernel and subject to change, whereas
1113          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1114          */
1115         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1116         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1117                 u |= URB_ISO_ASAP;
1118         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1119                 u |= URB_SHORT_NOT_OK;
1120         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1121                 u |= URB_NO_FSBR;
1122         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1123                 u |= URB_ZERO_PACKET;
1124         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1125                 u |= URB_NO_INTERRUPT;
1126         as->urb->transfer_flags = u;
1127
1128         as->urb->transfer_buffer_length = uurb->buffer_length;
1129         as->urb->setup_packet = (unsigned char *)dr;
1130         as->urb->start_frame = uurb->start_frame;
1131         as->urb->number_of_packets = uurb->number_of_packets;
1132         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1133                         ps->dev->speed == USB_SPEED_HIGH)
1134                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1135         else
1136                 as->urb->interval = ep->desc.bInterval;
1137         as->urb->context = as;
1138         as->urb->complete = async_completed;
1139         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1140                 as->urb->iso_frame_desc[u].offset = totlen;
1141                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1142                 totlen += isopkt[u].length;
1143         }
1144         kfree(isopkt);
1145         as->ps = ps;
1146         as->userurb = arg;
1147         if (uurb->endpoint & USB_DIR_IN)
1148                 as->userbuffer = uurb->buffer;
1149         else
1150                 as->userbuffer = NULL;
1151         as->signr = uurb->signr;
1152         as->ifnum = ifnum;
1153         as->pid = get_pid(task_pid(current));
1154         as->uid = current->uid;
1155         as->euid = current->euid;
1156         security_task_getsecid(current, &as->secid);
1157         if (!is_in) {
1158                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1159                                 as->urb->transfer_buffer_length)) {
1160                         free_async(as);
1161                         return -EFAULT;
1162                 }
1163         }
1164         snoop_urb(as->urb, as->userurb);
1165         async_newpending(as);
1166         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1167                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1168                            "usbfs: usb_submit_urb returned %d\n", ret);
1169                 async_removepending(as);
1170                 free_async(as);
1171                 return ret;
1172         }
1173         return 0;
1174 }
1175
1176 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1177 {
1178         struct usbdevfs_urb uurb;
1179
1180         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1181                 return -EFAULT;
1182
1183         return proc_do_submiturb(ps, &uurb,
1184                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1185                         arg);
1186 }
1187
1188 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1189 {
1190         struct async *as;
1191
1192         as = async_getpending(ps, arg);
1193         if (!as)
1194                 return -EINVAL;
1195         usb_kill_urb(as->urb);
1196         return 0;
1197 }
1198
1199 static int processcompl(struct async *as, void __user * __user *arg)
1200 {
1201         struct urb *urb = as->urb;
1202         struct usbdevfs_urb __user *userurb = as->userurb;
1203         void __user *addr = as->userurb;
1204         unsigned int i;
1205
1206         if (as->userbuffer)
1207                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1208                                  urb->transfer_buffer_length))
1209                         return -EFAULT;
1210         if (put_user(as->status, &userurb->status))
1211                 return -EFAULT;
1212         if (put_user(urb->actual_length, &userurb->actual_length))
1213                 return -EFAULT;
1214         if (put_user(urb->error_count, &userurb->error_count))
1215                 return -EFAULT;
1216
1217         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1218                 for (i = 0; i < urb->number_of_packets; i++) {
1219                         if (put_user(urb->iso_frame_desc[i].actual_length,
1220                                      &userurb->iso_frame_desc[i].actual_length))
1221                                 return -EFAULT;
1222                         if (put_user(urb->iso_frame_desc[i].status,
1223                                      &userurb->iso_frame_desc[i].status))
1224                                 return -EFAULT;
1225                 }
1226         }
1227
1228         free_async(as);
1229
1230         if (put_user(addr, (void __user * __user *)arg))
1231                 return -EFAULT;
1232         return 0;
1233 }
1234
1235 static struct async *reap_as(struct dev_state *ps)
1236 {
1237         DECLARE_WAITQUEUE(wait, current);
1238         struct async *as = NULL;
1239         struct usb_device *dev = ps->dev;
1240
1241         add_wait_queue(&ps->wait, &wait);
1242         for (;;) {
1243                 __set_current_state(TASK_INTERRUPTIBLE);
1244                 as = async_getcompleted(ps);
1245                 if (as)
1246                         break;
1247                 if (signal_pending(current))
1248                         break;
1249                 usb_unlock_device(dev);
1250                 schedule();
1251                 usb_lock_device(dev);
1252         }
1253         remove_wait_queue(&ps->wait, &wait);
1254         set_current_state(TASK_RUNNING);
1255         return as;
1256 }
1257
1258 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1259 {
1260         struct async *as = reap_as(ps);
1261         if (as)
1262                 return processcompl(as, (void __user * __user *)arg);
1263         if (signal_pending(current))
1264                 return -EINTR;
1265         return -EIO;
1266 }
1267
1268 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1269 {
1270         struct async *as;
1271
1272         if (!(as = async_getcompleted(ps)))
1273                 return -EAGAIN;
1274         return processcompl(as, (void __user * __user *)arg);
1275 }
1276
1277 #ifdef CONFIG_COMPAT
1278
1279 static int get_urb32(struct usbdevfs_urb *kurb,
1280                      struct usbdevfs_urb32 __user *uurb)
1281 {
1282         __u32  uptr;
1283         if (get_user(kurb->type, &uurb->type) ||
1284             __get_user(kurb->endpoint, &uurb->endpoint) ||
1285             __get_user(kurb->status, &uurb->status) ||
1286             __get_user(kurb->flags, &uurb->flags) ||
1287             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1288             __get_user(kurb->actual_length, &uurb->actual_length) ||
1289             __get_user(kurb->start_frame, &uurb->start_frame) ||
1290             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1291             __get_user(kurb->error_count, &uurb->error_count) ||
1292             __get_user(kurb->signr, &uurb->signr))
1293                 return -EFAULT;
1294
1295         if (__get_user(uptr, &uurb->buffer))
1296                 return -EFAULT;
1297         kurb->buffer = compat_ptr(uptr);
1298         if (__get_user(uptr, &uurb->buffer))
1299                 return -EFAULT;
1300         kurb->usercontext = compat_ptr(uptr);
1301
1302         return 0;
1303 }
1304
1305 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1306 {
1307         struct usbdevfs_urb uurb;
1308
1309         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1310                 return -EFAULT;
1311
1312         return proc_do_submiturb(ps, &uurb,
1313                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1314                         arg);
1315 }
1316
1317 static int processcompl_compat(struct async *as, void __user * __user *arg)
1318 {
1319         struct urb *urb = as->urb;
1320         struct usbdevfs_urb32 __user *userurb = as->userurb;
1321         void __user *addr = as->userurb;
1322         unsigned int i;
1323
1324         if (as->userbuffer)
1325                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1326                                  urb->transfer_buffer_length))
1327                         return -EFAULT;
1328         if (put_user(as->status, &userurb->status))
1329                 return -EFAULT;
1330         if (put_user(urb->actual_length, &userurb->actual_length))
1331                 return -EFAULT;
1332         if (put_user(urb->error_count, &userurb->error_count))
1333                 return -EFAULT;
1334
1335         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1336                 for (i = 0; i < urb->number_of_packets; i++) {
1337                         if (put_user(urb->iso_frame_desc[i].actual_length,
1338                                      &userurb->iso_frame_desc[i].actual_length))
1339                                 return -EFAULT;
1340                         if (put_user(urb->iso_frame_desc[i].status,
1341                                      &userurb->iso_frame_desc[i].status))
1342                                 return -EFAULT;
1343                 }
1344         }
1345
1346         free_async(as);
1347         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1348                 return -EFAULT;
1349         return 0;
1350 }
1351
1352 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1353 {
1354         struct async *as = reap_as(ps);
1355         if (as)
1356                 return processcompl_compat(as, (void __user * __user *)arg);
1357         if (signal_pending(current))
1358                 return -EINTR;
1359         return -EIO;
1360 }
1361
1362 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1363 {
1364         struct async *as;
1365
1366         if (!(as = async_getcompleted(ps)))
1367                 return -EAGAIN;
1368         return processcompl_compat(as, (void __user * __user *)arg);
1369 }
1370
1371 #endif
1372
1373 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1374 {
1375         struct usbdevfs_disconnectsignal ds;
1376
1377         if (copy_from_user(&ds, arg, sizeof(ds)))
1378                 return -EFAULT;
1379         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1380                 return -EINVAL;
1381         ps->discsignr = ds.signr;
1382         ps->disccontext = ds.context;
1383         return 0;
1384 }
1385
1386 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1387 {
1388         unsigned int ifnum;
1389
1390         if (get_user(ifnum, (unsigned int __user *)arg))
1391                 return -EFAULT;
1392         return claimintf(ps, ifnum);
1393 }
1394
1395 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1396 {
1397         unsigned int ifnum;
1398         int ret;
1399
1400         if (get_user(ifnum, (unsigned int __user *)arg))
1401                 return -EFAULT;
1402         if ((ret = releaseintf(ps, ifnum)) < 0)
1403                 return ret;
1404         destroy_async_on_interface (ps, ifnum);
1405         return 0;
1406 }
1407
1408 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1409 {
1410         int                     size;
1411         void                    *buf = NULL;
1412         int                     retval = 0;
1413         struct usb_interface    *intf = NULL;
1414         struct usb_driver       *driver = NULL;
1415
1416         /* alloc buffer */
1417         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1418                 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1419                         return -ENOMEM;
1420                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1421                         if (copy_from_user(buf, ctl->data, size)) {
1422                                 kfree(buf);
1423                                 return -EFAULT;
1424                         }
1425                 } else {
1426                         memset(buf, 0, size);
1427                 }
1428         }
1429
1430         if (!connected(ps)) {
1431                 kfree(buf);
1432                 return -ENODEV;
1433         }
1434
1435         if (ps->dev->state != USB_STATE_CONFIGURED)
1436                 retval = -EHOSTUNREACH;
1437         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1438                 retval = -EINVAL;
1439         else switch (ctl->ioctl_code) {
1440
1441         /* disconnect kernel driver from interface */
1442         case USBDEVFS_DISCONNECT:
1443                 if (intf->dev.driver) {
1444                         driver = to_usb_driver(intf->dev.driver);
1445                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1446                         usb_driver_release_interface(driver, intf);
1447                 } else
1448                         retval = -ENODATA;
1449                 break;
1450
1451         /* let kernel drivers try to (re)bind to the interface */
1452         case USBDEVFS_CONNECT:
1453                 if (!intf->dev.driver)
1454                         retval = device_attach(&intf->dev);
1455                 else
1456                         retval = -EBUSY;
1457                 break;
1458
1459         /* talk directly to the interface's driver */
1460         default:
1461                 if (intf->dev.driver)
1462                         driver = to_usb_driver(intf->dev.driver);
1463                 if (driver == NULL || driver->ioctl == NULL) {
1464                         retval = -ENOTTY;
1465                 } else {
1466                         retval = driver->ioctl(intf, ctl->ioctl_code, buf);
1467                         if (retval == -ENOIOCTLCMD)
1468                                 retval = -ENOTTY;
1469                 }
1470         }
1471
1472         /* cleanup and return */
1473         if (retval >= 0
1474                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1475                         && size > 0
1476                         && copy_to_user(ctl->data, buf, size) != 0)
1477                 retval = -EFAULT;
1478
1479         kfree(buf);
1480         return retval;
1481 }
1482
1483 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1484 {
1485         struct usbdevfs_ioctl   ctrl;
1486
1487         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1488                 return -EFAULT;
1489         return proc_ioctl(ps, &ctrl);
1490 }
1491
1492 #ifdef CONFIG_COMPAT
1493 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1494 {
1495         struct usbdevfs_ioctl32 __user *uioc;
1496         struct usbdevfs_ioctl ctrl;
1497         u32 udata;
1498
1499         uioc = compat_ptr((long)arg);
1500         if (get_user(ctrl.ifno, &uioc->ifno) ||
1501             get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1502             __get_user(udata, &uioc->data))
1503                 return -EFAULT;
1504         ctrl.data = compat_ptr(udata);
1505
1506         return proc_ioctl(ps, &ctrl);
1507 }
1508 #endif
1509
1510 /*
1511  * NOTE:  All requests here that have interface numbers as parameters
1512  * are assuming that somehow the configuration has been prevented from
1513  * changing.  But there's no mechanism to ensure that...
1514  */
1515 static int usbdev_ioctl(struct inode *inode, struct file *file,
1516                         unsigned int cmd, unsigned long arg)
1517 {
1518         struct dev_state *ps = file->private_data;
1519         struct usb_device *dev = ps->dev;
1520         void __user *p = (void __user *)arg;
1521         int ret = -ENOTTY;
1522
1523         if (!(file->f_mode & FMODE_WRITE))
1524                 return -EPERM;
1525         usb_lock_device(dev);
1526         if (!connected(ps)) {
1527                 usb_unlock_device(dev);
1528                 return -ENODEV;
1529         }
1530
1531         switch (cmd) {
1532         case USBDEVFS_CONTROL:
1533                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1534                 ret = proc_control(ps, p);
1535                 if (ret >= 0)
1536                         inode->i_mtime = CURRENT_TIME;
1537                 break;
1538
1539         case USBDEVFS_BULK:
1540                 snoop(&dev->dev, "%s: BULK\n", __func__);
1541                 ret = proc_bulk(ps, p);
1542                 if (ret >= 0)
1543                         inode->i_mtime = CURRENT_TIME;
1544                 break;
1545
1546         case USBDEVFS_RESETEP:
1547                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1548                 ret = proc_resetep(ps, p);
1549                 if (ret >= 0)
1550                         inode->i_mtime = CURRENT_TIME;
1551                 break;
1552
1553         case USBDEVFS_RESET:
1554                 snoop(&dev->dev, "%s: RESET\n", __func__);
1555                 ret = proc_resetdevice(ps);
1556                 break;
1557
1558         case USBDEVFS_CLEAR_HALT:
1559                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1560                 ret = proc_clearhalt(ps, p);
1561                 if (ret >= 0)
1562                         inode->i_mtime = CURRENT_TIME;
1563                 break;
1564
1565         case USBDEVFS_GETDRIVER:
1566                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1567                 ret = proc_getdriver(ps, p);
1568                 break;
1569
1570         case USBDEVFS_CONNECTINFO:
1571                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1572                 ret = proc_connectinfo(ps, p);
1573                 break;
1574
1575         case USBDEVFS_SETINTERFACE:
1576                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1577                 ret = proc_setintf(ps, p);
1578                 break;
1579
1580         case USBDEVFS_SETCONFIGURATION:
1581                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1582                 ret = proc_setconfig(ps, p);
1583                 break;
1584
1585         case USBDEVFS_SUBMITURB:
1586                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1587                 ret = proc_submiturb(ps, p);
1588                 if (ret >= 0)
1589                         inode->i_mtime = CURRENT_TIME;
1590                 break;
1591
1592 #ifdef CONFIG_COMPAT
1593
1594         case USBDEVFS_SUBMITURB32:
1595                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1596                 ret = proc_submiturb_compat(ps, p);
1597                 if (ret >= 0)
1598                         inode->i_mtime = CURRENT_TIME;
1599                 break;
1600
1601         case USBDEVFS_REAPURB32:
1602                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1603                 ret = proc_reapurb_compat(ps, p);
1604                 break;
1605
1606         case USBDEVFS_REAPURBNDELAY32:
1607                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __func__);
1608                 ret = proc_reapurbnonblock_compat(ps, p);
1609                 break;
1610
1611         case USBDEVFS_IOCTL32:
1612                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1613                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1614                 break;
1615 #endif
1616
1617         case USBDEVFS_DISCARDURB:
1618                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1619                 ret = proc_unlinkurb(ps, p);
1620                 break;
1621
1622         case USBDEVFS_REAPURB:
1623                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1624                 ret = proc_reapurb(ps, p);
1625                 break;
1626
1627         case USBDEVFS_REAPURBNDELAY:
1628                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __func__);
1629                 ret = proc_reapurbnonblock(ps, p);
1630                 break;
1631
1632         case USBDEVFS_DISCSIGNAL:
1633                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1634                 ret = proc_disconnectsignal(ps, p);
1635                 break;
1636
1637         case USBDEVFS_CLAIMINTERFACE:
1638                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1639                 ret = proc_claiminterface(ps, p);
1640                 break;
1641
1642         case USBDEVFS_RELEASEINTERFACE:
1643                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1644                 ret = proc_releaseinterface(ps, p);
1645                 break;
1646
1647         case USBDEVFS_IOCTL:
1648                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1649                 ret = proc_ioctl_default(ps, p);
1650                 break;
1651         }
1652         usb_unlock_device(dev);
1653         if (ret >= 0)
1654                 inode->i_atime = CURRENT_TIME;
1655         return ret;
1656 }
1657
1658 /* No kernel lock - fine */
1659 static unsigned int usbdev_poll(struct file *file,
1660                                 struct poll_table_struct *wait)
1661 {
1662         struct dev_state *ps = file->private_data;
1663         unsigned int mask = 0;
1664
1665         poll_wait(file, &ps->wait, wait);
1666         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1667                 mask |= POLLOUT | POLLWRNORM;
1668         if (!connected(ps))
1669                 mask |= POLLERR | POLLHUP;
1670         return mask;
1671 }
1672
1673 const struct file_operations usbdev_file_operations = {
1674         .owner =        THIS_MODULE,
1675         .llseek =       usbdev_lseek,
1676         .read =         usbdev_read,
1677         .poll =         usbdev_poll,
1678         .ioctl =        usbdev_ioctl,
1679         .open =         usbdev_open,
1680         .release =      usbdev_release,
1681 };
1682
1683 #ifdef CONFIG_USB_DEVICE_CLASS
1684 static struct class *usb_classdev_class;
1685
1686 static int usb_classdev_add(struct usb_device *dev)
1687 {
1688         int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1689
1690         dev->usb_classdev = device_create(usb_classdev_class, &dev->dev,
1691                                 MKDEV(USB_DEVICE_MAJOR, minor),
1692                                 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1693         if (IS_ERR(dev->usb_classdev))
1694                 return PTR_ERR(dev->usb_classdev);
1695
1696         return 0;
1697 }
1698
1699 static void usb_classdev_remove(struct usb_device *dev)
1700 {
1701         device_unregister(dev->usb_classdev);
1702 }
1703
1704 static int usb_classdev_notify(struct notifier_block *self,
1705                                unsigned long action, void *dev)
1706 {
1707         switch (action) {
1708         case USB_DEVICE_ADD:
1709                 if (usb_classdev_add(dev))
1710                         return NOTIFY_BAD;
1711                 break;
1712         case USB_DEVICE_REMOVE:
1713                 usb_classdev_remove(dev);
1714                 break;
1715         }
1716         return NOTIFY_OK;
1717 }
1718
1719 static struct notifier_block usbdev_nb = {
1720         .notifier_call =        usb_classdev_notify,
1721 };
1722 #endif
1723
1724 static struct cdev usb_device_cdev;
1725
1726 int __init usb_devio_init(void)
1727 {
1728         int retval;
1729
1730         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1731                                         "usb_device");
1732         if (retval) {
1733                 err("unable to register minors for usb_device");
1734                 goto out;
1735         }
1736         cdev_init(&usb_device_cdev, &usbdev_file_operations);
1737         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1738         if (retval) {
1739                 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1740                 goto error_cdev;
1741         }
1742 #ifdef CONFIG_USB_DEVICE_CLASS
1743         usb_classdev_class = class_create(THIS_MODULE, "usb_device");
1744         if (IS_ERR(usb_classdev_class)) {
1745                 err("unable to register usb_device class");
1746                 retval = PTR_ERR(usb_classdev_class);
1747                 cdev_del(&usb_device_cdev);
1748                 usb_classdev_class = NULL;
1749                 goto out;
1750         }
1751
1752         usb_register_notify(&usbdev_nb);
1753 #endif
1754 out:
1755         return retval;
1756
1757 error_cdev:
1758         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1759         goto out;
1760 }
1761
1762 void usb_devio_cleanup(void)
1763 {
1764 #ifdef CONFIG_USB_DEVICE_CLASS
1765         usb_unregister_notify(&usbdev_nb);
1766         class_destroy(usb_classdev_class);
1767 #endif
1768         cdev_del(&usb_device_cdev);
1769         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1770 }