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  *  $Id: devio.c,v 1.7 2000/02/01 17:28:48 fliegl Exp $
  23  *
  24  *  This file implements the usbfs/x/y files, where
  25  *  x is the bus number and y the device number.
  26  *
  27  *  It allows user space programs/"drivers" to communicate directly
  28  *  with USB devices without intervening kernel driver.
  29  *
  30  *  Revision history
  31  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  32  *    04.01.2000   0.2   Turned into its own filesystem
  33  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  34  *                       (CAN-2005-3055)
  35  */
  36
  37 /*****************************************************************************/
  38
  39 #include <linux/fs.h>
  40 #include <linux/mm.h>
  41 #include <linux/slab.h>
  42 #include <linux/smp_lock.h>
  43 #include <linux/signal.h>
  44 #include <linux/poll.h>
  45 #include <linux/module.h>
  46 #include <linux/usb.h>
  47 #include <linux/usbdevice_fs.h>
  48 #include <linux/cdev.h>
  49 #include <linux/notifier.h>
  50 #include <asm/uaccess.h>
  51 #include <asm/byteorder.h>
  52 #include <linux/moduleparam.h>
  53
  54 #include "hcd.h"        /* for usbcore internals */
  55 #include "usb.h"
  56
  57 #define USB_MAXBUS                      64
  58 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
  59 static struct class *usb_device_class;
  60
  61 struct async {
  62         struct list_head asynclist;
  63         struct dev_state *ps;
  64         pid_t pid;
  65         uid_t uid, euid;
  66         unsigned int signr;
  67         unsigned int ifnum;
  68         void __user *userbuffer;
  69         void __user *userurb;
  70         struct urb *urb;
  71 };
  72
  73 static int usbfs_snoop = 0;
  74 module_param (usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  75 MODULE_PARM_DESC (usbfs_snoop, "true to log all usbfs traffic");
  76
  77 #define snoop(dev, format, arg...)                              \
  78         do {                                                    \
  79                 if (usbfs_snoop)                                \
  80                         dev_info( dev , format , ## arg);       \
  81         } while (0)
  82
  83 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
  84
  85
  86 #define MAX_USBFS_BUFFER_SIZE   16384
  87
  88 static inline int connected (struct usb_device *dev)
  89 {
  90         return dev->state != USB_STATE_NOTATTACHED;
  91 }
  92
  93 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
  94 {
  95         loff_t ret;
  96
  97         lock_kernel();
  98
  99         switch (orig) {
 100         case 0:
 101                 file->f_pos = offset;
 102                 ret = file->f_pos;
 103                 break;
 104         case 1:
 105                 file->f_pos += offset;
 106                 ret = file->f_pos;
 107                 break;
 108         case 2:
 109         default:
 110                 ret = -EINVAL;
 111         }
 112
 113         unlock_kernel();
 114         return ret;
 115 }
 116
 117 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
 118 {
 119         struct dev_state *ps = (struct dev_state *)file->private_data;
 120         struct usb_device *dev = ps->dev;
 121         ssize_t ret = 0;
 122         unsigned len;
 123         loff_t pos;
 124         int i;
 125
 126         pos = *ppos;
 127         usb_lock_device(dev);
 128         if (!connected(dev)) {
 129                 ret = -ENODEV;
 130                 goto err;
 131         } else if (pos < 0) {
 132                 ret = -EINVAL;
 133                 goto err;
 134         }
 135
 136         if (pos < sizeof(struct usb_device_descriptor)) {
 137                 struct usb_device_descriptor *desc = kmalloc(sizeof(*desc), GFP_KERNEL);
 138                 if (!desc) {
 139                         ret = -ENOMEM;
 140                         goto err;
 141                 }
 142                 memcpy(desc, &dev->descriptor, sizeof(dev->descriptor));
 143                 le16_to_cpus(&desc->bcdUSB);
 144                 le16_to_cpus(&desc->idVendor);
 145                 le16_to_cpus(&desc->idProduct);
 146                 le16_to_cpus(&desc->bcdDevice);
 147
 148                 len = sizeof(struct usb_device_descriptor) - pos;
 149                 if (len > nbytes)
 150                         len = nbytes;
 151                 if (copy_to_user(buf, ((char *)desc) + pos, len)) {
 152                         kfree(desc);
 153                         ret = -EFAULT;
 154                         goto err;
 155                 }
 156                 kfree(desc);
 157
 158                 *ppos += len;
 159                 buf += len;
 160                 nbytes -= len;
 161                 ret += len;
 162         }
 163
 164         pos = sizeof(struct usb_device_descriptor);
 165         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 166                 struct usb_config_descriptor *config =
 167                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 168                 unsigned int length = le16_to_cpu(config->wTotalLength);
 169
 170                 if (*ppos < pos + length) {
 171
 172                         /* The descriptor may claim to be longer than it
 173                          * really is.  Here is the actual allocated length. */
 174                         unsigned alloclen =
 175                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 176
 177                         len = length - (*ppos - pos);
 178                         if (len > nbytes)
 179                                 len = nbytes;
 180
 181                         /* Simply don't write (skip over) unallocated parts */
 182                         if (alloclen > (*ppos - pos)) {
 183                                 alloclen -= (*ppos - pos);
 184                                 if (copy_to_user(buf,
 185                                     dev->rawdescriptors[i] + (*ppos - pos),
 186                                     min(len, alloclen))) {
 187                                         ret = -EFAULT;
 188                                         goto err;
 189                                 }
 190                         }
 191
 192                         *ppos += len;
 193                         buf += len;
 194                         nbytes -= len;
 195                         ret += len;
 196                 }
 197
 198                 pos += length;
 199         }
 200
 201 err:
 202         usb_unlock_device(dev);
 203         return ret;
 204 }
 205
 206 /*
 207  * async list handling
 208  */
 209
 210 static struct async *alloc_async(unsigned int numisoframes)
 211 {
 212         unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor);
 213         struct async *as = kmalloc(assize, GFP_KERNEL);
 214         if (!as)
 215                 return NULL;
 216         memset(as, 0, assize);
 217         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 218         if (!as->urb) {
 219                 kfree(as);
 220                 return NULL;
 221         }
 222         return as;
 223 }
 224
 225 static void free_async(struct async *as)
 226 {
 227         kfree(as->urb->transfer_buffer);
 228         kfree(as->urb->setup_packet);
 229         usb_free_urb(as->urb);
 230         kfree(as);
 231 }
 232
 233 static inline void async_newpending(struct async *as)
 234 {
 235         struct dev_state *ps = as->ps;
 236         unsigned long flags;
 237
 238         spin_lock_irqsave(&ps->lock, flags);
 239         list_add_tail(&as->asynclist, &ps->async_pending);
 240         spin_unlock_irqrestore(&ps->lock, flags);
 241 }
 242
 243 static inline void async_removepending(struct async *as)
 244 {
 245         struct dev_state *ps = as->ps;
 246         unsigned long flags;
 247
 248         spin_lock_irqsave(&ps->lock, flags);
 249         list_del_init(&as->asynclist);
 250         spin_unlock_irqrestore(&ps->lock, flags);
 251 }
 252
 253 static inline struct async *async_getcompleted(struct dev_state *ps)
 254 {
 255         unsigned long flags;
 256         struct async *as = NULL;
 257
 258         spin_lock_irqsave(&ps->lock, flags);
 259         if (!list_empty(&ps->async_completed)) {
 260                 as = list_entry(ps->async_completed.next, struct async, asynclist);
 261                 list_del_init(&as->asynclist);
 262         }
 263         spin_unlock_irqrestore(&ps->lock, flags);
 264         return as;
 265 }
 266
 267 static inline struct async *async_getpending(struct dev_state *ps, void __user *userurb)
 268 {
 269         unsigned long flags;
 270         struct async *as;
 271
 272         spin_lock_irqsave(&ps->lock, flags);
 273         list_for_each_entry(as, &ps->async_pending, asynclist)
 274                 if (as->userurb == userurb) {
 275                         list_del_init(&as->asynclist);
 276                         spin_unlock_irqrestore(&ps->lock, flags);
 277                         return as;
 278                 }
 279         spin_unlock_irqrestore(&ps->lock, flags);
 280         return NULL;
 281 }
 282
 283 static void snoop_urb(struct urb *urb, void __user *userurb)
 284 {
 285         int j;
 286         unsigned char *data = urb->transfer_buffer;
 287
 288         if (!usbfs_snoop)
 289                 return;
 290
 291         if (urb->pipe & USB_DIR_IN)
 292                 dev_info(&urb->dev->dev, "direction=IN\n");
 293         else
 294                 dev_info(&urb->dev->dev, "direction=OUT\n");
 295         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
 296         dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
 297                  urb->transfer_buffer_length);
 298         dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
 299         dev_info(&urb->dev->dev, "data: ");
 300         for (j = 0; j < urb->transfer_buffer_length; ++j)
 301                 printk ("%02x ", data[j]);
 302         printk("\n");
 303 }
 304
 305 static void async_completed(struct urb *urb, struct pt_regs *regs)
 306 {
 307         struct async *as = (struct async *)urb->context;
 308         struct dev_state *ps = as->ps;
 309         struct siginfo sinfo;
 310
 311         spin_lock(&ps->lock);
 312         list_move_tail(&as->asynclist, &ps->async_completed);
 313         spin_unlock(&ps->lock);
 314         if (as->signr) {
 315                 sinfo.si_signo = as->signr;
 316                 sinfo.si_errno = as->urb->status;
 317                 sinfo.si_code = SI_ASYNCIO;
 318                 sinfo.si_addr = as->userurb;
 319                 kill_proc_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
 320                                       as->euid);
 321         }
 322         snoop(&urb->dev->dev, "urb complete\n");
 323         snoop_urb(urb, as->userurb);
 324         wake_up(&ps->wait);
 325 }
 326
 327 static void destroy_async (struct dev_state *ps, struct list_head *list)
 328 {
 329         struct async *as;
 330         unsigned long flags;
 331
 332         spin_lock_irqsave(&ps->lock, flags);
 333         while (!list_empty(list)) {
 334                 as = list_entry(list->next, struct async, asynclist);
 335                 list_del_init(&as->asynclist);
 336
 337                 /* drop the spinlock so the completion handler can run */
 338                 spin_unlock_irqrestore(&ps->lock, flags);
 339                 usb_kill_urb(as->urb);
 340                 spin_lock_irqsave(&ps->lock, flags);
 341         }
 342         spin_unlock_irqrestore(&ps->lock, flags);
 343         as = async_getcompleted(ps);
 344         while (as) {
 345                 free_async(as);
 346                 as = async_getcompleted(ps);
 347         }
 348 }
 349
 350 static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum)
 351 {
 352         struct list_head *p, *q, hitlist;
 353         unsigned long flags;
 354
 355         INIT_LIST_HEAD(&hitlist);
 356         spin_lock_irqsave(&ps->lock, flags);
 357         list_for_each_safe(p, q, &ps->async_pending)
 358                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 359                         list_move_tail(p, &hitlist);
 360         spin_unlock_irqrestore(&ps->lock, flags);
 361         destroy_async(ps, &hitlist);
 362 }
 363
 364 static inline void destroy_all_async(struct dev_state *ps)
 365 {
 366                 destroy_async(ps, &ps->async_pending);
 367 }
 368
 369 /*
 370  * interface claims are made only at the request of user level code,
 371  * which can also release them (explicitly or by closing files).
 372  * they're also undone when devices disconnect.
 373  */
 374
 375 static int driver_probe (struct usb_interface *intf,
 376                          const struct usb_device_id *id)
 377 {
 378         return -ENODEV;
 379 }
 380
 381 static void driver_disconnect(struct usb_interface *intf)
 382 {
 383         struct dev_state *ps = usb_get_intfdata (intf);
 384         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 385
 386         if (!ps)
 387                 return;
 388
 389         /* NOTE:  this relies on usbcore having canceled and completed
 390          * all pending I/O requests; 2.6 does that.
 391          */
 392
 393         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 394                 clear_bit(ifnum, &ps->ifclaimed);
 395         else
 396                 warn("interface number %u out of range", ifnum);
 397
 398         usb_set_intfdata (intf, NULL);
 399
 400         /* force async requests to complete */
 401         destroy_async_on_interface(ps, ifnum);
 402 }
 403
 404 struct usb_driver usbfs_driver = {
 405         .owner =        THIS_MODULE,
 406         .name =         "usbfs",
 407         .probe =        driver_probe,
 408         .disconnect =   driver_disconnect,
 409 };
 410
 411 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 412 {
 413         struct usb_device *dev = ps->dev;
 414         struct usb_interface *intf;
 415         int err;
 416
 417         if (ifnum >= 8*sizeof(ps->ifclaimed))
 418                 return -EINVAL;
 419         /* already claimed */
 420         if (test_bit(ifnum, &ps->ifclaimed))
 421                 return 0;
 422
 423         /* lock against other changes to driver bindings */
 424         down_write(&usb_bus_type.subsys.rwsem);
 425         intf = usb_ifnum_to_if(dev, ifnum);
 426         if (!intf)
 427                 err = -ENOENT;
 428         else
 429                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 430         up_write(&usb_bus_type.subsys.rwsem);
 431         if (err == 0)
 432                 set_bit(ifnum, &ps->ifclaimed);
 433         return err;
 434 }
 435
 436 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 437 {
 438         struct usb_device *dev;
 439         struct usb_interface *intf;
 440         int err;
 441
 442         err = -EINVAL;
 443         if (ifnum >= 8*sizeof(ps->ifclaimed))
 444                 return err;
 445         dev = ps->dev;
 446         /* lock against other changes to driver bindings */
 447         down_write(&usb_bus_type.subsys.rwsem);
 448         intf = usb_ifnum_to_if(dev, ifnum);
 449         if (!intf)
 450                 err = -ENOENT;
 451         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 452                 usb_driver_release_interface(&usbfs_driver, intf);
 453                 err = 0;
 454         }
 455         up_write(&usb_bus_type.subsys.rwsem);
 456         return err;
 457 }
 458
 459 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 460 {
 461         if (ps->dev->state != USB_STATE_CONFIGURED)
 462                 return -EHOSTUNREACH;
 463         if (ifnum >= 8*sizeof(ps->ifclaimed))
 464                 return -EINVAL;
 465         if (test_bit(ifnum, &ps->ifclaimed))
 466                 return 0;
 467         /* if not yet claimed, claim it for the driver */
 468         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n",
 469                current->pid, current->comm, ifnum);
 470         return claimintf(ps, ifnum);
 471 }
 472
 473 static int findintfep(struct usb_device *dev, unsigned int ep)
 474 {
 475         unsigned int i, j, e;
 476         struct usb_interface *intf;
 477         struct usb_host_interface *alts;
 478         struct usb_endpoint_descriptor *endpt;
 479
 480         if (ep & ~(USB_DIR_IN|0xf))
 481                 return -EINVAL;
 482         if (!dev->actconfig)
 483                 return -ESRCH;
 484         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 485                 intf = dev->actconfig->interface[i];
 486                 for (j = 0; j < intf->num_altsetting; j++) {
 487                         alts = &intf->altsetting[j];
 488                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 489                                 endpt = &alts->endpoint[e].desc;
 490                                 if (endpt->bEndpointAddress == ep)
 491                                         return alts->desc.bInterfaceNumber;
 492                         }
 493                 }
 494         }
 495         return -ENOENT;
 496 }
 497
 498 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
 499 {
 500         int ret = 0;
 501
 502         if (ps->dev->state != USB_STATE_CONFIGURED)
 503                 return -EHOSTUNREACH;
 504         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 505                 return 0;
 506
 507         index &= 0xff;
 508         switch (requesttype & USB_RECIP_MASK) {
 509         case USB_RECIP_ENDPOINT:
 510                 if ((ret = findintfep(ps->dev, index)) >= 0)
 511                         ret = checkintf(ps, ret);
 512                 break;
 513
 514         case USB_RECIP_INTERFACE:
 515                 ret = checkintf(ps, index);
 516                 break;
 517         }
 518         return ret;
 519 }
 520
 521 static struct usb_device *usbdev_lookup_minor(int minor)
 522 {
 523         struct class_device *class_dev;
 524         struct usb_device *dev = NULL;
 525
 526         down(&usb_device_class->sem);
 527         list_for_each_entry(class_dev, &usb_device_class->children, node) {
 528                 if (class_dev->devt == MKDEV(USB_DEVICE_MAJOR, minor)) {
 529                         dev = class_dev->class_data;
 530                         break;
 531                 }
 532         }
 533         up(&usb_device_class->sem);
 534
 535         return dev;
 536 };
 537
 538 /*
 539  * file operations
 540  */
 541 static int usbdev_open(struct inode *inode, struct file *file)
 542 {
 543         struct usb_device *dev = NULL;
 544         struct dev_state *ps;
 545         int ret;
 546
 547         /*
 548          * no locking necessary here, as chrdev_open has the kernel lock
 549          * (still acquire the kernel lock for safety)
 550          */
 551         ret = -ENOMEM;
 552         if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
 553                 goto out_nolock;
 554
 555         lock_kernel();
 556         ret = -ENOENT;
 557         /* check if we are called from a real node or usbfs */
 558         if (imajor(inode) == USB_DEVICE_MAJOR)
 559                 dev = usbdev_lookup_minor(iminor(inode));
 560         if (!dev)
 561                 dev = inode->u.generic_ip;
 562         if (!dev) {
 563                 kfree(ps);
 564                 goto out;
 565         }
 566         usb_get_dev(dev);
 567         ret = 0;
 568         ps->dev = dev;
 569         ps->file = file;
 570         spin_lock_init(&ps->lock);
 571         INIT_LIST_HEAD(&ps->async_pending);
 572         INIT_LIST_HEAD(&ps->async_completed);
 573         init_waitqueue_head(&ps->wait);
 574         ps->discsignr = 0;
 575         ps->disc_pid = current->pid;
 576         ps->disc_uid = current->uid;
 577         ps->disc_euid = current->euid;
 578         ps->disccontext = NULL;
 579         ps->ifclaimed = 0;
 580         wmb();
 581         list_add_tail(&ps->list, &dev->filelist);
 582         file->private_data = ps;
 583  out:
 584         unlock_kernel();
 585  out_nolock:
 586         return ret;
 587 }
 588
 589 static int usbdev_release(struct inode *inode, struct file *file)
 590 {
 591         struct dev_state *ps = (struct dev_state *)file->private_data;
 592         struct usb_device *dev = ps->dev;
 593         unsigned int ifnum;
 594
 595         usb_lock_device(dev);
 596         list_del_init(&ps->list);
 597         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 598                         ifnum++) {
 599                 if (test_bit(ifnum, &ps->ifclaimed))
 600                         releaseintf(ps, ifnum);
 601         }
 602         destroy_all_async(ps);
 603         usb_unlock_device(dev);
 604         usb_put_dev(dev);
 605         ps->dev = NULL;
 606         kfree(ps);
 607         return 0;
 608 }
 609
 610 static int proc_control(struct dev_state *ps, void __user *arg)
 611 {
 612         struct usb_device *dev = ps->dev;
 613         struct usbdevfs_ctrltransfer ctrl;
 614         unsigned int tmo;
 615         unsigned char *tbuf;
 616         int i, j, ret;
 617
 618         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 619                 return -EFAULT;
 620         if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
 621                 return ret;
 622         if (ctrl.wLength > PAGE_SIZE)
 623                 return -EINVAL;
 624         if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
 625                 return -ENOMEM;
 626         tmo = ctrl.timeout;
 627         if (ctrl.bRequestType & 0x80) {
 628                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
 629                         free_page((unsigned long)tbuf);
 630                         return -EINVAL;
 631                 }
 632                 snoop(&dev->dev, "control read: bRequest=%02x "
 633                                 "bRrequestType=%02x wValue=%04x "
 634                                 "wIndex=%04x wLength=%04x\n",
 635                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 636                                 ctrl.wIndex, ctrl.wLength);
 637
 638                 usb_unlock_device(dev);
 639                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 640                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 641                 usb_lock_device(dev);
 642                 if ((i > 0) && ctrl.wLength) {
 643                         if (usbfs_snoop) {
 644                                 dev_info(&dev->dev, "control read: data ");
 645                                 for (j = 0; j < i; ++j)
 646                                         printk("%02x ", (unsigned char)(tbuf)[j]);
 647                                 printk("\n");
 648                         }
 649                         if (copy_to_user(ctrl.data, tbuf, i)) {
 650                                 free_page((unsigned long)tbuf);
 651                                 return -EFAULT;
 652                         }
 653                 }
 654         } else {
 655                 if (ctrl.wLength) {
 656                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 657                                 free_page((unsigned long)tbuf);
 658                                 return -EFAULT;
 659                         }
 660                 }
 661                 snoop(&dev->dev, "control write: bRequest=%02x "
 662                                 "bRrequestType=%02x wValue=%04x "
 663                                 "wIndex=%04x wLength=%04x\n",
 664                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 665                                 ctrl.wIndex, ctrl.wLength);
 666                 if (usbfs_snoop) {
 667                         dev_info(&dev->dev, "control write: data: ");
 668                         for (j = 0; j < ctrl.wLength; ++j)
 669                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 670                         printk("\n");
 671                 }
 672                 usb_unlock_device(dev);
 673                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 674                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 675                 usb_lock_device(dev);
 676         }
 677         free_page((unsigned long)tbuf);
 678         if (i<0 && i != -EPIPE) {
 679                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 680                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 681                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 682                            ctrl.wLength, i);
 683         }
 684         return i;
 685 }
 686
 687 static int proc_bulk(struct dev_state *ps, void __user *arg)
 688 {
 689         struct usb_device *dev = ps->dev;
 690         struct usbdevfs_bulktransfer bulk;
 691         unsigned int tmo, len1, pipe;
 692         int len2;
 693         unsigned char *tbuf;
 694         int i, j, ret;
 695
 696         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 697                 return -EFAULT;
 698         if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
 699                 return ret;
 700         if ((ret = checkintf(ps, ret)))
 701                 return ret;
 702         if (bulk.ep & USB_DIR_IN)
 703                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 704         else
 705                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 706         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 707                 return -EINVAL;
 708         len1 = bulk.len;
 709         if (len1 > MAX_USBFS_BUFFER_SIZE)
 710                 return -EINVAL;
 711         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 712                 return -ENOMEM;
 713         tmo = bulk.timeout;
 714         if (bulk.ep & 0x80) {
 715                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 716                         kfree(tbuf);
 717                         return -EINVAL;
 718                 }
 719                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
 720                         bulk.len, bulk.timeout);
 721                 usb_unlock_device(dev);
 722                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 723                 usb_lock_device(dev);
 724                 if (!i && len2) {
 725                         if (usbfs_snoop) {
 726                                 dev_info(&dev->dev, "bulk read: data ");
 727                                 for (j = 0; j < len2; ++j)
 728                                         printk("%02x ", (unsigned char)(tbuf)[j]);
 729                                 printk("\n");
 730                         }
 731                         if (copy_to_user(bulk.data, tbuf, len2)) {
 732                                 kfree(tbuf);
 733                                 return -EFAULT;
 734                         }
 735                 }
 736         } else {
 737                 if (len1) {
 738                         if (copy_from_user(tbuf, bulk.data, len1)) {
 739                                 kfree(tbuf);
 740                                 return -EFAULT;
 741                         }
 742                 }
 743                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
 744                         bulk.len, bulk.timeout);
 745                 if (usbfs_snoop) {
 746                         dev_info(&dev->dev, "bulk write: data: ");
 747                         for (j = 0; j < len1; ++j)
 748                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 749                         printk("\n");
 750                 }
 751                 usb_unlock_device(dev);
 752                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 753                 usb_lock_device(dev);
 754         }
 755         kfree(tbuf);
 756         if (i < 0)
 757                 return i;
 758         return len2;
 759 }
 760
 761 static int proc_resetep(struct dev_state *ps, void __user *arg)
 762 {
 763         unsigned int ep;
 764         int ret;
 765
 766         if (get_user(ep, (unsigned int __user *)arg))
 767                 return -EFAULT;
 768         if ((ret = findintfep(ps->dev, ep)) < 0)
 769                 return ret;
 770         if ((ret = checkintf(ps, ret)))
 771                 return ret;
 772         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
 773         return 0;
 774 }
 775
 776 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 777 {
 778         unsigned int ep;
 779         int pipe;
 780         int ret;
 781
 782         if (get_user(ep, (unsigned int __user *)arg))
 783                 return -EFAULT;
 784         if ((ret = findintfep(ps->dev, ep)) < 0)
 785                 return ret;
 786         if ((ret = checkintf(ps, ret)))
 787                 return ret;
 788         if (ep & USB_DIR_IN)
 789                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 790         else
 791                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 792
 793         return usb_clear_halt(ps->dev, pipe);
 794 }
 795
 796
 797 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 798 {
 799         struct usbdevfs_getdriver gd;
 800         struct usb_interface *intf;
 801         int ret;
 802
 803         if (copy_from_user(&gd, arg, sizeof(gd)))
 804                 return -EFAULT;
 805         down_read(&usb_bus_type.subsys.rwsem);
 806         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 807         if (!intf || !intf->dev.driver)
 808                 ret = -ENODATA;
 809         else {
 810                 strncpy(gd.driver, intf->dev.driver->name,
 811                                 sizeof(gd.driver));
 812                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 813         }
 814         up_read(&usb_bus_type.subsys.rwsem);
 815         return ret;
 816 }
 817
 818 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 819 {
 820         struct usbdevfs_connectinfo ci;
 821
 822         ci.devnum = ps->dev->devnum;
 823         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 824         if (copy_to_user(arg, &ci, sizeof(ci)))
 825                 return -EFAULT;
 826         return 0;
 827 }
 828
 829 static int proc_resetdevice(struct dev_state *ps)
 830 {
 831         return usb_reset_device(ps->dev);
 832
 833 }
 834
 835 static int proc_setintf(struct dev_state *ps, void __user *arg)
 836 {
 837         struct usbdevfs_setinterface setintf;
 838         int ret;
 839
 840         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 841                 return -EFAULT;
 842         if ((ret = checkintf(ps, setintf.interface)))
 843                 return ret;
 844         return usb_set_interface(ps->dev, setintf.interface,
 845                         setintf.altsetting);
 846 }
 847
 848 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 849 {
 850         unsigned int u;
 851         int status = 0;
 852         struct usb_host_config *actconfig;
 853
 854         if (get_user(u, (unsigned int __user *)arg))
 855                 return -EFAULT;
 856
 857         actconfig = ps->dev->actconfig;
 858
 859         /* Don't touch the device if any interfaces are claimed.
 860          * It could interfere with other drivers' operations, and if
 861          * an interface is claimed by usbfs it could easily deadlock.
 862          */
 863         if (actconfig) {
 864                 int i;
 865
 866                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 867                         if (usb_interface_claimed(actconfig->interface[i])) {
 868                                 dev_warn (&ps->dev->dev,
 869                                         "usbfs: interface %d claimed by %s "
 870                                         "while '%s' sets config #%d\n",
 871                                         actconfig->interface[i]
 872                                                 ->cur_altsetting
 873                                                 ->desc.bInterfaceNumber,
 874                                         actconfig->interface[i]
 875                                                 ->dev.driver->name,
 876                                         current->comm, u);
 877                                 status = -EBUSY;
 878                                 break;
 879                         }
 880                 }
 881         }
 882
 883         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 884          * so avoid usb_set_configuration()'s kick to sysfs
 885          */
 886         if (status == 0) {
 887                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 888                         status = usb_reset_configuration(ps->dev);
 889                 else
 890                         status = usb_set_configuration(ps->dev, u);
 891         }
 892
 893         return status;
 894 }
 895
 896 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 897                              struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
 898                              void __user *arg)
 899 {
 900         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 901         struct usb_host_endpoint *ep;
 902         struct async *as;
 903         struct usb_ctrlrequest *dr = NULL;
 904         unsigned int u, totlen, isofrmlen;
 905         int ret, interval = 0, ifnum = -1;
 906
 907         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
 908                            URB_NO_FSBR|URB_ZERO_PACKET))
 909                 return -EINVAL;
 910         if (!uurb->buffer)
 911                 return -EINVAL;
 912         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
 913                 return -EINVAL;
 914         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
 915                 if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
 916                         return ifnum;
 917                 if ((ret = checkintf(ps, ifnum)))
 918                         return ret;
 919         }
 920         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0)
 921                 ep = ps->dev->ep_in [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 922         else
 923                 ep = ps->dev->ep_out [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 924         if (!ep)
 925                 return -ENOENT;
 926         switch(uurb->type) {
 927         case USBDEVFS_URB_TYPE_CONTROL:
 928                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 929                                 != USB_ENDPOINT_XFER_CONTROL)
 930                         return -EINVAL;
 931                 /* min 8 byte setup packet, max arbitrary */
 932                 if (uurb->buffer_length < 8 || uurb->buffer_length > PAGE_SIZE)
 933                         return -EINVAL;
 934                 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
 935                         return -ENOMEM;
 936                 if (copy_from_user(dr, uurb->buffer, 8)) {
 937                         kfree(dr);
 938                         return -EFAULT;
 939                 }
 940                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
 941                         kfree(dr);
 942                         return -EINVAL;
 943                 }
 944                 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
 945                         kfree(dr);
 946                         return ret;
 947                 }
 948                 uurb->endpoint = (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK);
 949                 uurb->number_of_packets = 0;
 950                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
 951                 uurb->buffer += 8;
 952                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ?  VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) {
 953                         kfree(dr);
 954                         return -EFAULT;
 955                 }
 956                 snoop(&ps->dev->dev, "control urb\n");
 957                 break;
 958
 959         case USBDEVFS_URB_TYPE_BULK:
 960                 switch (ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 961                 case USB_ENDPOINT_XFER_CONTROL:
 962                 case USB_ENDPOINT_XFER_ISOC:
 963                         return -EINVAL;
 964                 /* allow single-shot interrupt transfers, at bogus rates */
 965                 }
 966                 uurb->number_of_packets = 0;
 967                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
 968                         return -EINVAL;
 969                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
 970                         return -EFAULT;
 971                 snoop(&ps->dev->dev, "bulk urb\n");
 972                 break;
 973
 974         case USBDEVFS_URB_TYPE_ISO:
 975                 /* arbitrary limit */
 976                 if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
 977                         return -EINVAL;
 978                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 979                                 != USB_ENDPOINT_XFER_ISOC)
 980                         return -EINVAL;
 981                 interval = 1 << min (15, ep->desc.bInterval - 1);
 982                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
 983                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
 984                         return -ENOMEM;
 985                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
 986                         kfree(isopkt);
 987                         return -EFAULT;
 988                 }
 989                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
 990                         if (isopkt[u].length > 1023) {
 991                                 kfree(isopkt);
 992                                 return -EINVAL;
 993                         }
 994                         totlen += isopkt[u].length;
 995                 }
 996                 if (totlen > 32768) {
 997                         kfree(isopkt);
 998                         return -EINVAL;
 999                 }
1000                 uurb->buffer_length = totlen;
1001                 snoop(&ps->dev->dev, "iso urb\n");
1002                 break;
1003
1004         case USBDEVFS_URB_TYPE_INTERRUPT:
1005                 uurb->number_of_packets = 0;
1006                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
1007                                 != USB_ENDPOINT_XFER_INT)
1008                         return -EINVAL;
1009                 if (ps->dev->speed == USB_SPEED_HIGH)
1010                         interval = 1 << min (15, ep->desc.bInterval - 1);
1011                 else
1012                         interval = ep->desc.bInterval;
1013                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1014                         return -EINVAL;
1015                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
1016                         return -EFAULT;
1017                 snoop(&ps->dev->dev, "interrupt urb\n");
1018                 break;
1019
1020         default:
1021                 return -EINVAL;
1022         }
1023         if (!(as = alloc_async(uurb->number_of_packets))) {
1024                 kfree(isopkt);
1025                 kfree(dr);
1026                 return -ENOMEM;
1027         }
1028         if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
1029                 kfree(isopkt);
1030                 kfree(dr);
1031                 free_async(as);
1032                 return -ENOMEM;
1033         }
1034         as->urb->dev = ps->dev;
1035         as->urb->pipe = (uurb->type << 30) | __create_pipe(ps->dev, uurb->endpoint & 0xf) | (uurb->endpoint & USB_DIR_IN);
1036         as->urb->transfer_flags = uurb->flags;
1037         as->urb->transfer_buffer_length = uurb->buffer_length;
1038         as->urb->setup_packet = (unsigned char*)dr;
1039         as->urb->start_frame = uurb->start_frame;
1040         as->urb->number_of_packets = uurb->number_of_packets;
1041         as->urb->interval = interval;
1042         as->urb->context = as;
1043         as->urb->complete = async_completed;
1044         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1045                 as->urb->iso_frame_desc[u].offset = totlen;
1046                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1047                 totlen += isopkt[u].length;
1048         }
1049         kfree(isopkt);
1050         as->ps = ps;
1051         as->userurb = arg;
1052         if (uurb->endpoint & USB_DIR_IN)
1053                 as->userbuffer = uurb->buffer;
1054         else
1055                 as->userbuffer = NULL;
1056         as->signr = uurb->signr;
1057         as->ifnum = ifnum;
1058         as->pid = current->pid;
1059         as->uid = current->uid;
1060         as->euid = current->euid;
1061         if (!(uurb->endpoint & USB_DIR_IN)) {
1062                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, as->urb->transfer_buffer_length)) {
1063                         free_async(as);
1064                         return -EFAULT;
1065                 }
1066         }
1067         snoop(&as->urb->dev->dev, "submit urb\n");
1068         snoop_urb(as->urb, as->userurb);
1069         async_newpending(as);
1070         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1071                 dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
1072                 async_removepending(as);
1073                 free_async(as);
1074                 return ret;
1075         }
1076         return 0;
1077 }
1078
1079 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1080 {
1081         struct usbdevfs_urb uurb;
1082
1083         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1084                 return -EFAULT;
1085
1086         return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg);
1087 }
1088
1089 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1090 {
1091         struct async *as;
1092
1093         as = async_getpending(ps, arg);
1094         if (!as)
1095                 return -EINVAL;
1096         usb_kill_urb(as->urb);
1097         return 0;
1098 }
1099
1100 static int processcompl(struct async *as, void __user * __user *arg)
1101 {
1102         struct urb *urb = as->urb;
1103         struct usbdevfs_urb __user *userurb = as->userurb;
1104         void __user *addr = as->userurb;
1105         unsigned int i;
1106
1107         if (as->userbuffer)
1108                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1109                         return -EFAULT;
1110         if (put_user(urb->status, &userurb->status))
1111                 return -EFAULT;
1112         if (put_user(urb->actual_length, &userurb->actual_length))
1113                 return -EFAULT;
1114         if (put_user(urb->error_count, &userurb->error_count))
1115                 return -EFAULT;
1116
1117         if (usb_pipeisoc(urb->pipe)) {
1118                 for (i = 0; i < urb->number_of_packets; i++) {
1119                         if (put_user(urb->iso_frame_desc[i].actual_length,
1120                                      &userurb->iso_frame_desc[i].actual_length))
1121                                 return -EFAULT;
1122                         if (put_user(urb->iso_frame_desc[i].status,
1123                                      &userurb->iso_frame_desc[i].status))
1124                                 return -EFAULT;
1125                 }
1126         }
1127
1128         free_async(as);
1129
1130         if (put_user(addr, (void __user * __user *)arg))
1131                 return -EFAULT;
1132         return 0;
1133 }
1134
1135 static struct async* reap_as(struct dev_state *ps)
1136 {
1137         DECLARE_WAITQUEUE(wait, current);
1138         struct async *as = NULL;
1139         struct usb_device *dev = ps->dev;
1140
1141         add_wait_queue(&ps->wait, &wait);
1142         for (;;) {
1143                 __set_current_state(TASK_INTERRUPTIBLE);
1144                 if ((as = async_getcompleted(ps)))
1145                         break;
1146                 if (signal_pending(current))
1147                         break;
1148                 usb_unlock_device(dev);
1149                 schedule();
1150                 usb_lock_device(dev);
1151         }
1152         remove_wait_queue(&ps->wait, &wait);
1153         set_current_state(TASK_RUNNING);
1154         return as;
1155 }
1156
1157 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1158 {
1159         struct async *as = reap_as(ps);
1160         if (as)
1161                 return processcompl(as, (void __user * __user *)arg);
1162         if (signal_pending(current))
1163                 return -EINTR;
1164         return -EIO;
1165 }
1166
1167 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1168 {
1169         struct async *as;
1170
1171         if (!(as = async_getcompleted(ps)))
1172                 return -EAGAIN;
1173         return processcompl(as, (void __user * __user *)arg);
1174 }
1175
1176 #ifdef CONFIG_COMPAT
1177
1178 static int get_urb32(struct usbdevfs_urb *kurb,
1179                      struct usbdevfs_urb32 __user *uurb)
1180 {
1181         __u32  uptr;
1182         if (get_user(kurb->type, &uurb->type) ||
1183             __get_user(kurb->endpoint, &uurb->endpoint) ||
1184             __get_user(kurb->status, &uurb->status) ||
1185             __get_user(kurb->flags, &uurb->flags) ||
1186             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1187             __get_user(kurb->actual_length, &uurb->actual_length) ||
1188             __get_user(kurb->start_frame, &uurb->start_frame) ||
1189             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1190             __get_user(kurb->error_count, &uurb->error_count) ||
1191             __get_user(kurb->signr, &uurb->signr))
1192                 return -EFAULT;
1193
1194         if (__get_user(uptr, &uurb->buffer))
1195                 return -EFAULT;
1196         kurb->buffer = compat_ptr(uptr);
1197         if (__get_user(uptr, &uurb->buffer))
1198                 return -EFAULT;
1199         kurb->usercontext = compat_ptr(uptr);
1200
1201         return 0;
1202 }
1203
1204 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1205 {
1206         struct usbdevfs_urb uurb;
1207
1208         if (get_urb32(&uurb,(struct usbdevfs_urb32 *)arg))
1209                 return -EFAULT;
1210
1211         return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg);
1212 }
1213
1214 static int processcompl_compat(struct async *as, void __user * __user *arg)
1215 {
1216         struct urb *urb = as->urb;
1217         struct usbdevfs_urb32 __user *userurb = as->userurb;
1218         void __user *addr = as->userurb;
1219         unsigned int i;
1220
1221         if (as->userbuffer)
1222                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1223                         return -EFAULT;
1224         if (put_user(urb->status, &userurb->status))
1225                 return -EFAULT;
1226         if (put_user(urb->actual_length, &userurb->actual_length))
1227                 return -EFAULT;
1228         if (put_user(urb->error_count, &userurb->error_count))
1229                 return -EFAULT;
1230
1231         if (usb_pipeisoc(urb->pipe)) {
1232                 for (i = 0; i < urb->number_of_packets; i++) {
1233                         if (put_user(urb->iso_frame_desc[i].actual_length,
1234                                      &userurb->iso_frame_desc[i].actual_length))
1235                                 return -EFAULT;
1236                         if (put_user(urb->iso_frame_desc[i].status,
1237                                      &userurb->iso_frame_desc[i].status))
1238                                 return -EFAULT;
1239                 }
1240         }
1241
1242         free_async(as);
1243         if (put_user((u32)(u64)addr, (u32 __user *)arg))
1244                 return -EFAULT;
1245         return 0;
1246 }
1247
1248 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1249 {
1250         struct async *as = reap_as(ps);
1251         if (as)
1252                 return processcompl_compat(as, (void __user * __user *)arg);
1253         if (signal_pending(current))
1254                 return -EINTR;
1255         return -EIO;
1256 }
1257
1258 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1259 {
1260         struct async *as;
1261
1262         if (!(as = async_getcompleted(ps)))
1263                 return -EAGAIN;
1264         return processcompl_compat(as, (void __user * __user *)arg);
1265 }
1266
1267 #endif
1268
1269 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1270 {
1271         struct usbdevfs_disconnectsignal ds;
1272
1273         if (copy_from_user(&ds, arg, sizeof(ds)))
1274                 return -EFAULT;
1275         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1276                 return -EINVAL;
1277         ps->discsignr = ds.signr;
1278         ps->disccontext = ds.context;
1279         return 0;
1280 }
1281
1282 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1283 {
1284         unsigned int ifnum;
1285
1286         if (get_user(ifnum, (unsigned int __user *)arg))
1287                 return -EFAULT;
1288         return claimintf(ps, ifnum);
1289 }
1290
1291 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1292 {
1293         unsigned int ifnum;
1294         int ret;
1295
1296         if (get_user(ifnum, (unsigned int __user *)arg))
1297                 return -EFAULT;
1298         if ((ret = releaseintf(ps, ifnum)) < 0)
1299                 return ret;
1300         destroy_async_on_interface (ps, ifnum);
1301         return 0;
1302 }
1303
1304 static int proc_ioctl (struct dev_state *ps, void __user *arg)
1305 {
1306         struct usbdevfs_ioctl   ctrl;
1307         int                     size;
1308         void                    *buf = NULL;
1309         int                     retval = 0;
1310         struct usb_interface    *intf = NULL;
1311         struct usb_driver       *driver = NULL;
1312
1313         /* get input parameters and alloc buffer */
1314         if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
1315                 return -EFAULT;
1316         if ((size = _IOC_SIZE (ctrl.ioctl_code)) > 0) {
1317                 if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
1318                         return -ENOMEM;
1319                 if ((_IOC_DIR(ctrl.ioctl_code) & _IOC_WRITE)) {
1320                         if (copy_from_user (buf, ctrl.data, size)) {
1321                                 kfree(buf);
1322                                 return -EFAULT;
1323                         }
1324                 } else {
1325                         memset (buf, 0, size);
1326                 }
1327         }
1328
1329         if (!connected(ps->dev)) {
1330                 kfree(buf);
1331                 return -ENODEV;
1332         }
1333
1334         if (ps->dev->state != USB_STATE_CONFIGURED)
1335                 retval = -EHOSTUNREACH;
1336         else if (!(intf = usb_ifnum_to_if (ps->dev, ctrl.ifno)))
1337                retval = -EINVAL;
1338         else switch (ctrl.ioctl_code) {
1339
1340         /* disconnect kernel driver from interface */
1341         case USBDEVFS_DISCONNECT:
1342
1343                 down_write(&usb_bus_type.subsys.rwsem);
1344                 if (intf->dev.driver) {
1345                         driver = to_usb_driver(intf->dev.driver);
1346                         dev_dbg (&intf->dev, "disconnect by usbfs\n");
1347                         usb_driver_release_interface(driver, intf);
1348                 } else
1349                         retval = -ENODATA;
1350                 up_write(&usb_bus_type.subsys.rwsem);
1351                 break;
1352
1353         /* let kernel drivers try to (re)bind to the interface */
1354         case USBDEVFS_CONNECT:
1355                 usb_unlock_device(ps->dev);
1356                 usb_lock_all_devices();
1357                 bus_rescan_devices(intf->dev.bus);
1358                 usb_unlock_all_devices();
1359                 usb_lock_device(ps->dev);
1360                 break;
1361
1362         /* talk directly to the interface's driver */
1363         default:
1364                 down_read(&usb_bus_type.subsys.rwsem);
1365                 if (intf->dev.driver)
1366                         driver = to_usb_driver(intf->dev.driver);
1367                 if (driver == NULL || driver->ioctl == NULL) {
1368                         retval = -ENOTTY;
1369                 } else {
1370                         retval = driver->ioctl (intf, ctrl.ioctl_code, buf);
1371                         if (retval == -ENOIOCTLCMD)
1372                                 retval = -ENOTTY;
1373                 }
1374                 up_read(&usb_bus_type.subsys.rwsem);
1375         }
1376
1377         /* cleanup and return */
1378         if (retval >= 0
1379                         && (_IOC_DIR (ctrl.ioctl_code) & _IOC_READ) != 0
1380                         && size > 0
1381                         && copy_to_user (ctrl.data, buf, size) != 0)
1382                 retval = -EFAULT;
1383
1384         kfree(buf);
1385         return retval;
1386 }
1387
1388 /*
1389  * NOTE:  All requests here that have interface numbers as parameters
1390  * are assuming that somehow the configuration has been prevented from
1391  * changing.  But there's no mechanism to ensure that...
1392  */
1393 static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1394 {
1395         struct dev_state *ps = (struct dev_state *)file->private_data;
1396         struct usb_device *dev = ps->dev;
1397         void __user *p = (void __user *)arg;
1398         int ret = -ENOTTY;
1399
1400         if (!(file->f_mode & FMODE_WRITE))
1401                 return -EPERM;
1402         usb_lock_device(dev);
1403         if (!connected(dev)) {
1404                 usb_unlock_device(dev);
1405                 return -ENODEV;
1406         }
1407
1408         switch (cmd) {
1409         case USBDEVFS_CONTROL:
1410                 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
1411                 ret = proc_control(ps, p);
1412                 if (ret >= 0)
1413                         inode->i_mtime = CURRENT_TIME;
1414                 break;
1415
1416         case USBDEVFS_BULK:
1417                 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
1418                 ret = proc_bulk(ps, p);
1419                 if (ret >= 0)
1420                         inode->i_mtime = CURRENT_TIME;
1421                 break;
1422
1423         case USBDEVFS_RESETEP:
1424                 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
1425                 ret = proc_resetep(ps, p);
1426                 if (ret >= 0)
1427                         inode->i_mtime = CURRENT_TIME;
1428                 break;
1429
1430         case USBDEVFS_RESET:
1431                 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
1432                 ret = proc_resetdevice(ps);
1433                 break;
1434
1435         case USBDEVFS_CLEAR_HALT:
1436                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
1437                 ret = proc_clearhalt(ps, p);
1438                 if (ret >= 0)
1439                         inode->i_mtime = CURRENT_TIME;
1440                 break;
1441
1442         case USBDEVFS_GETDRIVER:
1443                 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
1444                 ret = proc_getdriver(ps, p);
1445                 break;
1446
1447         case USBDEVFS_CONNECTINFO:
1448                 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
1449                 ret = proc_connectinfo(ps, p);
1450                 break;
1451
1452         case USBDEVFS_SETINTERFACE:
1453                 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
1454                 ret = proc_setintf(ps, p);
1455                 break;
1456
1457         case USBDEVFS_SETCONFIGURATION:
1458                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
1459                 ret = proc_setconfig(ps, p);
1460                 break;
1461
1462         case USBDEVFS_SUBMITURB:
1463                 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
1464                 ret = proc_submiturb(ps, p);
1465                 if (ret >= 0)
1466                         inode->i_mtime = CURRENT_TIME;
1467                 break;
1468
1469 #ifdef CONFIG_COMPAT
1470
1471         case USBDEVFS_SUBMITURB32:
1472                 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
1473                 ret = proc_submiturb_compat(ps, p);
1474                 if (ret >= 0)
1475                         inode->i_mtime = CURRENT_TIME;
1476                 break;
1477
1478         case USBDEVFS_REAPURB32:
1479                 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
1480                 ret = proc_reapurb_compat(ps, p);
1481                 break;
1482
1483         case USBDEVFS_REAPURBNDELAY32:
1484                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
1485                 ret = proc_reapurbnonblock_compat(ps, p);
1486                 break;
1487
1488 #endif
1489
1490         case USBDEVFS_DISCARDURB:
1491                 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
1492                 ret = proc_unlinkurb(ps, p);
1493                 break;
1494
1495         case USBDEVFS_REAPURB:
1496                 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
1497                 ret = proc_reapurb(ps, p);
1498                 break;
1499
1500         case USBDEVFS_REAPURBNDELAY:
1501                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
1502                 ret = proc_reapurbnonblock(ps, p);
1503                 break;
1504
1505         case USBDEVFS_DISCSIGNAL:
1506                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
1507                 ret = proc_disconnectsignal(ps, p);
1508                 break;
1509
1510         case USBDEVFS_CLAIMINTERFACE:
1511                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
1512                 ret = proc_claiminterface(ps, p);
1513                 break;
1514
1515         case USBDEVFS_RELEASEINTERFACE:
1516                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
1517                 ret = proc_releaseinterface(ps, p);
1518                 break;
1519
1520         case USBDEVFS_IOCTL:
1521                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1522                 ret = proc_ioctl(ps, p);
1523                 break;
1524         }
1525         usb_unlock_device(dev);
1526         if (ret >= 0)
1527                 inode->i_atime = CURRENT_TIME;
1528         return ret;
1529 }
1530
1531 /* No kernel lock - fine */
1532 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
1533 {
1534         struct dev_state *ps = (struct dev_state *)file->private_data;
1535         unsigned int mask = 0;
1536
1537         poll_wait(file, &ps->wait, wait);
1538         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1539                 mask |= POLLOUT | POLLWRNORM;
1540         if (!connected(ps->dev))
1541                 mask |= POLLERR | POLLHUP;
1542         return mask;
1543 }
1544
1545 struct file_operations usbfs_device_file_operations = {
1546         .llseek =       usbdev_lseek,
1547         .read =         usbdev_read,
1548         .poll =         usbdev_poll,
1549         .ioctl =        usbdev_ioctl,
1550         .open =         usbdev_open,
1551         .release =      usbdev_release,
1552 };
1553
1554 static void usbdev_add(struct usb_device *dev)
1555 {
1556         int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1557
1558         dev->class_dev = class_device_create(usb_device_class, NULL,
1559                                 MKDEV(USB_DEVICE_MAJOR, minor), &dev->dev,
1560                                 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1561
1562         dev->class_dev->class_data = dev;
1563 }
1564
1565 static void usbdev_remove(struct usb_device *dev)
1566 {
1567         class_device_unregister(dev->class_dev);
1568 }
1569
1570 static int usbdev_notify(struct notifier_block *self, unsigned long action,
1571                          void *dev)
1572 {
1573         switch (action) {
1574         case USB_DEVICE_ADD:
1575                 usbdev_add(dev);
1576                 break;
1577         case USB_DEVICE_REMOVE:
1578                 usbdev_remove(dev);
1579                 break;
1580         }
1581         return NOTIFY_OK;
1582 }
1583
1584 static struct notifier_block usbdev_nb = {
1585         .notifier_call =        usbdev_notify,
1586 };
1587
1588 static struct cdev usb_device_cdev = {
1589         .kobj   = {.name = "usb_device", },
1590         .owner  = THIS_MODULE,
1591 };
1592
1593 int __init usbdev_init(void)
1594 {
1595         int retval;
1596
1597         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1598                         "usb_device");
1599         if (retval) {
1600                 err("unable to register minors for usb_device");
1601                 goto out;
1602         }
1603         cdev_init(&usb_device_cdev, &usbfs_device_file_operations);
1604         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1605         if (retval) {
1606                 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1607                 goto error_cdev;
1608         }
1609         usb_device_class = class_create(THIS_MODULE, "usb_device");
1610         if (IS_ERR(usb_device_class)) {
1611                 err("unable to register usb_device class");
1612                 retval = PTR_ERR(usb_device_class);
1613                 goto error_class;
1614         }
1615
1616         usb_register_notify(&usbdev_nb);
1617
1618 out:
1619         return retval;
1620
1621 error_class:
1622         usb_device_class = NULL;
1623         cdev_del(&usb_device_cdev);
1624
1625 error_cdev:
1626         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1627         goto out;
1628 }
1629
1630 void usbdev_cleanup(void)
1631 {
1632         usb_unregister_notify(&usbdev_nb);
1633         class_destroy(usb_device_class);
1634         cdev_del(&usb_device_cdev);
1635         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1636 }
1637