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  */
  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 <asm/uaccess.h>
  47 #include <asm/byteorder.h>
  48 #include <linux/moduleparam.h>
  49
  50 #include "hcd.h"        /* for usbcore internals */
  51 #include "usb.h"
  52
  53 struct async {
  54         struct list_head asynclist;
  55         struct dev_state *ps;
  56         struct task_struct *task;
  57         unsigned int signr;
  58         unsigned int ifnum;
  59         void __user *userbuffer;
  60         void __user *userurb;
  61         struct urb *urb;
  62 };
  63
  64 static int usbfs_snoop = 0;
  65 module_param (usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  66 MODULE_PARM_DESC (usbfs_snoop, "true to log all usbfs traffic");
  67
  68 #define snoop(dev, format, arg...)                              \
  69         do {                                                    \
  70                 if (usbfs_snoop)                                \
  71                         dev_info( dev , format , ## arg);       \
  72         } while (0)
  73
  74
  75 #define MAX_USBFS_BUFFER_SIZE   16384
  76
  77 static inline int connected (struct usb_device *dev)
  78 {
  79         return dev->state != USB_STATE_NOTATTACHED;
  80 }
  81
  82 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
  83 {
  84         loff_t ret;
  85
  86         lock_kernel();
  87
  88         switch (orig) {
  89         case 0:
  90                 file->f_pos = offset;
  91                 ret = file->f_pos;
  92                 break;
  93         case 1:
  94                 file->f_pos += offset;
  95                 ret = file->f_pos;
  96                 break;
  97         case 2:
  98         default:
  99                 ret = -EINVAL;
 100         }
 101
 102         unlock_kernel();
 103         return ret;
 104 }
 105
 106 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
 107 {
 108         struct dev_state *ps = (struct dev_state *)file->private_data;
 109         struct usb_device *dev = ps->dev;
 110         ssize_t ret = 0;
 111         unsigned len;
 112         loff_t pos;
 113         int i;
 114
 115         pos = *ppos;
 116         usb_lock_device(dev);
 117         if (!connected(dev)) {
 118                 ret = -ENODEV;
 119                 goto err;
 120         } else if (pos < 0) {
 121                 ret = -EINVAL;
 122                 goto err;
 123         }
 124
 125         if (pos < sizeof(struct usb_device_descriptor)) {
 126                 struct usb_device_descriptor *desc = kmalloc(sizeof(*desc), GFP_KERNEL);
 127                 if (!desc) {
 128                         ret = -ENOMEM;
 129                         goto err;
 130                 }
 131                 memcpy(desc, &dev->descriptor, sizeof(dev->descriptor));
 132                 le16_to_cpus(&desc->bcdUSB);
 133                 le16_to_cpus(&desc->idVendor);
 134                 le16_to_cpus(&desc->idProduct);
 135                 le16_to_cpus(&desc->bcdDevice);
 136
 137                 len = sizeof(struct usb_device_descriptor) - pos;
 138                 if (len > nbytes)
 139                         len = nbytes;
 140                 if (copy_to_user(buf, ((char *)desc) + pos, len)) {
 141                         kfree(desc);
 142                         ret = -EFAULT;
 143                         goto err;
 144                 }
 145                 kfree(desc);
 146
 147                 *ppos += len;
 148                 buf += len;
 149                 nbytes -= len;
 150                 ret += len;
 151         }
 152
 153         pos = sizeof(struct usb_device_descriptor);
 154         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 155                 struct usb_config_descriptor *config =
 156                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 157                 unsigned int length = le16_to_cpu(config->wTotalLength);
 158
 159                 if (*ppos < pos + length) {
 160
 161                         /* The descriptor may claim to be longer than it
 162                          * really is.  Here is the actual allocated length. */
 163                         unsigned alloclen =
 164                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 165
 166                         len = length - (*ppos - pos);
 167                         if (len > nbytes)
 168                                 len = nbytes;
 169
 170                         /* Simply don't write (skip over) unallocated parts */
 171                         if (alloclen > (*ppos - pos)) {
 172                                 alloclen -= (*ppos - pos);
 173                                 if (copy_to_user(buf,
 174                                     dev->rawdescriptors[i] + (*ppos - pos),
 175                                     min(len, alloclen))) {
 176                                         ret = -EFAULT;
 177                                         goto err;
 178                                 }
 179                         }
 180
 181                         *ppos += len;
 182                         buf += len;
 183                         nbytes -= len;
 184                         ret += len;
 185                 }
 186
 187                 pos += length;
 188         }
 189
 190 err:
 191         usb_unlock_device(dev);
 192         return ret;
 193 }
 194
 195 /*
 196  * async list handling
 197  */
 198
 199 static struct async *alloc_async(unsigned int numisoframes)
 200 {
 201         unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor);
 202         struct async *as = kmalloc(assize, GFP_KERNEL);
 203         if (!as)
 204                 return NULL;
 205         memset(as, 0, assize);
 206         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 207         if (!as->urb) {
 208                 kfree(as);
 209                 return NULL;
 210         }
 211         return as;
 212 }
 213
 214 static void free_async(struct async *as)
 215 {
 216         kfree(as->urb->transfer_buffer);
 217         kfree(as->urb->setup_packet);
 218         usb_free_urb(as->urb);
 219         kfree(as);
 220 }
 221
 222 static inline void async_newpending(struct async *as)
 223 {
 224         struct dev_state *ps = as->ps;
 225         unsigned long flags;
 226
 227         spin_lock_irqsave(&ps->lock, flags);
 228         list_add_tail(&as->asynclist, &ps->async_pending);
 229         spin_unlock_irqrestore(&ps->lock, flags);
 230 }
 231
 232 static inline void async_removepending(struct async *as)
 233 {
 234         struct dev_state *ps = as->ps;
 235         unsigned long flags;
 236
 237         spin_lock_irqsave(&ps->lock, flags);
 238         list_del_init(&as->asynclist);
 239         spin_unlock_irqrestore(&ps->lock, flags);
 240 }
 241
 242 static inline struct async *async_getcompleted(struct dev_state *ps)
 243 {
 244         unsigned long flags;
 245         struct async *as = NULL;
 246
 247         spin_lock_irqsave(&ps->lock, flags);
 248         if (!list_empty(&ps->async_completed)) {
 249                 as = list_entry(ps->async_completed.next, struct async, asynclist);
 250                 list_del_init(&as->asynclist);
 251         }
 252         spin_unlock_irqrestore(&ps->lock, flags);
 253         return as;
 254 }
 255
 256 static inline struct async *async_getpending(struct dev_state *ps, void __user *userurb)
 257 {
 258         unsigned long flags;
 259         struct async *as;
 260
 261         spin_lock_irqsave(&ps->lock, flags);
 262         list_for_each_entry(as, &ps->async_pending, asynclist)
 263                 if (as->userurb == userurb) {
 264                         list_del_init(&as->asynclist);
 265                         spin_unlock_irqrestore(&ps->lock, flags);
 266                         return as;
 267                 }
 268         spin_unlock_irqrestore(&ps->lock, flags);
 269         return NULL;
 270 }
 271
 272 static void async_completed(struct urb *urb, struct pt_regs *regs)
 273 {
 274         struct async *as = (struct async *)urb->context;
 275         struct dev_state *ps = as->ps;
 276         struct siginfo sinfo;
 277
 278         spin_lock(&ps->lock);
 279         list_move_tail(&as->asynclist, &ps->async_completed);
 280         spin_unlock(&ps->lock);
 281         if (as->signr) {
 282                 sinfo.si_signo = as->signr;
 283                 sinfo.si_errno = as->urb->status;
 284                 sinfo.si_code = SI_ASYNCIO;
 285                 sinfo.si_addr = as->userurb;
 286                 send_sig_info(as->signr, &sinfo, as->task);
 287         }
 288         wake_up(&ps->wait);
 289 }
 290
 291 static void destroy_async (struct dev_state *ps, struct list_head *list)
 292 {
 293         struct async *as;
 294         unsigned long flags;
 295
 296         spin_lock_irqsave(&ps->lock, flags);
 297         while (!list_empty(list)) {
 298                 as = list_entry(list->next, struct async, asynclist);
 299                 list_del_init(&as->asynclist);
 300
 301                 /* drop the spinlock so the completion handler can run */
 302                 spin_unlock_irqrestore(&ps->lock, flags);
 303                 usb_kill_urb(as->urb);
 304                 spin_lock_irqsave(&ps->lock, flags);
 305         }
 306         spin_unlock_irqrestore(&ps->lock, flags);
 307         as = async_getcompleted(ps);
 308         while (as) {
 309                 free_async(as);
 310                 as = async_getcompleted(ps);
 311         }
 312 }
 313
 314 static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum)
 315 {
 316         struct list_head *p, *q, hitlist;
 317         unsigned long flags;
 318
 319         INIT_LIST_HEAD(&hitlist);
 320         spin_lock_irqsave(&ps->lock, flags);
 321         list_for_each_safe(p, q, &ps->async_pending)
 322                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 323                         list_move_tail(p, &hitlist);
 324         spin_unlock_irqrestore(&ps->lock, flags);
 325         destroy_async(ps, &hitlist);
 326 }
 327
 328 static inline void destroy_all_async(struct dev_state *ps)
 329 {
 330                 destroy_async(ps, &ps->async_pending);
 331 }
 332
 333 /*
 334  * interface claims are made only at the request of user level code,
 335  * which can also release them (explicitly or by closing files).
 336  * they're also undone when devices disconnect.
 337  */
 338
 339 static int driver_probe (struct usb_interface *intf,
 340                          const struct usb_device_id *id)
 341 {
 342         return -ENODEV;
 343 }
 344
 345 static void driver_disconnect(struct usb_interface *intf)
 346 {
 347         struct dev_state *ps = usb_get_intfdata (intf);
 348         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 349
 350         if (!ps)
 351                 return;
 352
 353         /* NOTE:  this relies on usbcore having canceled and completed
 354          * all pending I/O requests; 2.6 does that.
 355          */
 356
 357         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 358                 clear_bit(ifnum, &ps->ifclaimed);
 359         else
 360                 warn("interface number %u out of range", ifnum);
 361
 362         usb_set_intfdata (intf, NULL);
 363
 364         /* force async requests to complete */
 365         destroy_async_on_interface(ps, ifnum);
 366 }
 367
 368 struct usb_driver usbfs_driver = {
 369         .owner =        THIS_MODULE,
 370         .name =         "usbfs",
 371         .probe =        driver_probe,
 372         .disconnect =   driver_disconnect,
 373 };
 374
 375 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 376 {
 377         struct usb_device *dev = ps->dev;
 378         struct usb_interface *intf;
 379         int err;
 380
 381         if (ifnum >= 8*sizeof(ps->ifclaimed))
 382                 return -EINVAL;
 383         /* already claimed */
 384         if (test_bit(ifnum, &ps->ifclaimed))
 385                 return 0;
 386
 387         /* lock against other changes to driver bindings */
 388         down_write(&usb_bus_type.subsys.rwsem);
 389         intf = usb_ifnum_to_if(dev, ifnum);
 390         if (!intf)
 391                 err = -ENOENT;
 392         else
 393                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 394         up_write(&usb_bus_type.subsys.rwsem);
 395         if (err == 0)
 396                 set_bit(ifnum, &ps->ifclaimed);
 397         return err;
 398 }
 399
 400 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 401 {
 402         struct usb_device *dev;
 403         struct usb_interface *intf;
 404         int err;
 405
 406         err = -EINVAL;
 407         if (ifnum >= 8*sizeof(ps->ifclaimed))
 408                 return err;
 409         dev = ps->dev;
 410         /* lock against other changes to driver bindings */
 411         down_write(&usb_bus_type.subsys.rwsem);
 412         intf = usb_ifnum_to_if(dev, ifnum);
 413         if (!intf)
 414                 err = -ENOENT;
 415         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 416                 usb_driver_release_interface(&usbfs_driver, intf);
 417                 err = 0;
 418         }
 419         up_write(&usb_bus_type.subsys.rwsem);
 420         return err;
 421 }
 422
 423 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 424 {
 425         if (ps->dev->state != USB_STATE_CONFIGURED)
 426                 return -EHOSTUNREACH;
 427         if (ifnum >= 8*sizeof(ps->ifclaimed))
 428                 return -EINVAL;
 429         if (test_bit(ifnum, &ps->ifclaimed))
 430                 return 0;
 431         /* if not yet claimed, claim it for the driver */
 432         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n",
 433                current->pid, current->comm, ifnum);
 434         return claimintf(ps, ifnum);
 435 }
 436
 437 static int findintfep(struct usb_device *dev, unsigned int ep)
 438 {
 439         unsigned int i, j, e;
 440         struct usb_interface *intf;
 441         struct usb_host_interface *alts;
 442         struct usb_endpoint_descriptor *endpt;
 443
 444         if (ep & ~(USB_DIR_IN|0xf))
 445                 return -EINVAL;
 446         if (!dev->actconfig)
 447                 return -ESRCH;
 448         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 449                 intf = dev->actconfig->interface[i];
 450                 for (j = 0; j < intf->num_altsetting; j++) {
 451                         alts = &intf->altsetting[j];
 452                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 453                                 endpt = &alts->endpoint[e].desc;
 454                                 if (endpt->bEndpointAddress == ep)
 455                                         return alts->desc.bInterfaceNumber;
 456                         }
 457                 }
 458         }
 459         return -ENOENT;
 460 }
 461
 462 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
 463 {
 464         int ret = 0;
 465
 466         if (ps->dev->state != USB_STATE_CONFIGURED)
 467                 return -EHOSTUNREACH;
 468         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 469                 return 0;
 470
 471         index &= 0xff;
 472         switch (requesttype & USB_RECIP_MASK) {
 473         case USB_RECIP_ENDPOINT:
 474                 if ((ret = findintfep(ps->dev, index)) >= 0)
 475                         ret = checkintf(ps, ret);
 476                 break;
 477
 478         case USB_RECIP_INTERFACE:
 479                 ret = checkintf(ps, index);
 480                 break;
 481         }
 482         return ret;
 483 }
 484
 485 /*
 486  * file operations
 487  */
 488 static int usbdev_open(struct inode *inode, struct file *file)
 489 {
 490         struct usb_device *dev;
 491         struct dev_state *ps;
 492         int ret;
 493
 494         /*
 495          * no locking necessary here, as chrdev_open has the kernel lock
 496          * (still acquire the kernel lock for safety)
 497          */
 498         ret = -ENOMEM;
 499         if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
 500                 goto out_nolock;
 501
 502         lock_kernel();
 503         ret = -ENOENT;
 504         dev = usb_get_dev(inode->u.generic_ip);
 505         if (!dev) {
 506                 kfree(ps);
 507                 goto out;
 508         }
 509         ret = 0;
 510         ps->dev = dev;
 511         ps->file = file;
 512         spin_lock_init(&ps->lock);
 513         INIT_LIST_HEAD(&ps->async_pending);
 514         INIT_LIST_HEAD(&ps->async_completed);
 515         init_waitqueue_head(&ps->wait);
 516         ps->discsignr = 0;
 517         ps->disctask = current;
 518         ps->disccontext = NULL;
 519         ps->ifclaimed = 0;
 520         wmb();
 521         list_add_tail(&ps->list, &dev->filelist);
 522         file->private_data = ps;
 523  out:
 524         unlock_kernel();
 525  out_nolock:
 526         return ret;
 527 }
 528
 529 static int usbdev_release(struct inode *inode, struct file *file)
 530 {
 531         struct dev_state *ps = (struct dev_state *)file->private_data;
 532         struct usb_device *dev = ps->dev;
 533         unsigned int ifnum;
 534
 535         usb_lock_device(dev);
 536         list_del_init(&ps->list);
 537         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 538                         ifnum++) {
 539                 if (test_bit(ifnum, &ps->ifclaimed))
 540                         releaseintf(ps, ifnum);
 541         }
 542         destroy_all_async(ps);
 543         usb_unlock_device(dev);
 544         usb_put_dev(dev);
 545         ps->dev = NULL;
 546         kfree(ps);
 547         return 0;
 548 }
 549
 550 static int proc_control(struct dev_state *ps, void __user *arg)
 551 {
 552         struct usb_device *dev = ps->dev;
 553         struct usbdevfs_ctrltransfer ctrl;
 554         unsigned int tmo;
 555         unsigned char *tbuf;
 556         int i, j, ret;
 557
 558         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 559                 return -EFAULT;
 560         if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
 561                 return ret;
 562         if (ctrl.wLength > PAGE_SIZE)
 563                 return -EINVAL;
 564         if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
 565                 return -ENOMEM;
 566         tmo = ctrl.timeout;
 567         if (ctrl.bRequestType & 0x80) {
 568                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
 569                         free_page((unsigned long)tbuf);
 570                         return -EINVAL;
 571                 }
 572                 snoop(&dev->dev, "control read: bRequest=%02x bRrequestType=%02x wValue=%04x wIndex=%04x\n",
 573                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue, ctrl.wIndex);
 574
 575                 usb_unlock_device(dev);
 576                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 577                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 578                 usb_lock_device(dev);
 579                 if ((i > 0) && ctrl.wLength) {
 580                         if (usbfs_snoop) {
 581                                 dev_info(&dev->dev, "control read: data ");
 582                                 for (j = 0; j < ctrl.wLength; ++j)
 583                                         printk ("%02x ", (unsigned char)(tbuf)[j]);
 584                                 printk("\n");
 585                         }
 586                         if (copy_to_user(ctrl.data, tbuf, ctrl.wLength)) {
 587                                 free_page((unsigned long)tbuf);
 588                                 return -EFAULT;
 589                         }
 590                 }
 591         } else {
 592                 if (ctrl.wLength) {
 593                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 594                                 free_page((unsigned long)tbuf);
 595                                 return -EFAULT;
 596                         }
 597                 }
 598                 snoop(&dev->dev, "control write: bRequest=%02x bRrequestType=%02x wValue=%04x wIndex=%04x\n",
 599                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue, ctrl.wIndex);
 600                 if (usbfs_snoop) {
 601                         dev_info(&dev->dev, "control write: data: ");
 602                         for (j = 0; j < ctrl.wLength; ++j)
 603                                 printk ("%02x ", (unsigned char)(tbuf)[j]);
 604                         printk("\n");
 605                 }
 606                 usb_unlock_device(dev);
 607                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 608                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 609                 usb_lock_device(dev);
 610         }
 611         free_page((unsigned long)tbuf);
 612         if (i<0 && i != -EPIPE) {
 613                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 614                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 615                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 616                            ctrl.wLength, i);
 617         }
 618         return i;
 619 }
 620
 621 static int proc_bulk(struct dev_state *ps, void __user *arg)
 622 {
 623         struct usb_device *dev = ps->dev;
 624         struct usbdevfs_bulktransfer bulk;
 625         unsigned int tmo, len1, pipe;
 626         int len2;
 627         unsigned char *tbuf;
 628         int i, ret;
 629
 630         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 631                 return -EFAULT;
 632         if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
 633                 return ret;
 634         if ((ret = checkintf(ps, ret)))
 635                 return ret;
 636         if (bulk.ep & USB_DIR_IN)
 637                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 638         else
 639                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 640         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 641                 return -EINVAL;
 642         len1 = bulk.len;
 643         if (len1 > MAX_USBFS_BUFFER_SIZE)
 644                 return -EINVAL;
 645         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 646                 return -ENOMEM;
 647         tmo = bulk.timeout;
 648         if (bulk.ep & 0x80) {
 649                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 650                         kfree(tbuf);
 651                         return -EINVAL;
 652                 }
 653                 usb_unlock_device(dev);
 654                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 655                 usb_lock_device(dev);
 656                 if (!i && len2) {
 657                         if (copy_to_user(bulk.data, tbuf, len2)) {
 658                                 kfree(tbuf);
 659                                 return -EFAULT;
 660                         }
 661                 }
 662         } else {
 663                 if (len1) {
 664                         if (copy_from_user(tbuf, bulk.data, len1)) {
 665                                 kfree(tbuf);
 666                                 return -EFAULT;
 667                         }
 668                 }
 669                 usb_unlock_device(dev);
 670                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 671                 usb_lock_device(dev);
 672         }
 673         kfree(tbuf);
 674         if (i < 0)
 675                 return i;
 676         return len2;
 677 }
 678
 679 static int proc_resetep(struct dev_state *ps, void __user *arg)
 680 {
 681         unsigned int ep;
 682         int ret;
 683
 684         if (get_user(ep, (unsigned int __user *)arg))
 685                 return -EFAULT;
 686         if ((ret = findintfep(ps->dev, ep)) < 0)
 687                 return ret;
 688         if ((ret = checkintf(ps, ret)))
 689                 return ret;
 690         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
 691         return 0;
 692 }
 693
 694 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 695 {
 696         unsigned int ep;
 697         int pipe;
 698         int ret;
 699
 700         if (get_user(ep, (unsigned int __user *)arg))
 701                 return -EFAULT;
 702         if ((ret = findintfep(ps->dev, ep)) < 0)
 703                 return ret;
 704         if ((ret = checkintf(ps, ret)))
 705                 return ret;
 706         if (ep & USB_DIR_IN)
 707                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 708         else
 709                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 710
 711         return usb_clear_halt(ps->dev, pipe);
 712 }
 713
 714
 715 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 716 {
 717         struct usbdevfs_getdriver gd;
 718         struct usb_interface *intf;
 719         int ret;
 720
 721         if (copy_from_user(&gd, arg, sizeof(gd)))
 722                 return -EFAULT;
 723         down_read(&usb_bus_type.subsys.rwsem);
 724         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 725         if (!intf || !intf->dev.driver)
 726                 ret = -ENODATA;
 727         else {
 728                 strncpy(gd.driver, intf->dev.driver->name,
 729                                 sizeof(gd.driver));
 730                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 731         }
 732         up_read(&usb_bus_type.subsys.rwsem);
 733         return ret;
 734 }
 735
 736 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 737 {
 738         struct usbdevfs_connectinfo ci;
 739
 740         ci.devnum = ps->dev->devnum;
 741         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 742         if (copy_to_user(arg, &ci, sizeof(ci)))
 743                 return -EFAULT;
 744         return 0;
 745 }
 746
 747 static int proc_resetdevice(struct dev_state *ps)
 748 {
 749         return usb_reset_device(ps->dev);
 750
 751 }
 752
 753 static int proc_setintf(struct dev_state *ps, void __user *arg)
 754 {
 755         struct usbdevfs_setinterface setintf;
 756         int ret;
 757
 758         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 759                 return -EFAULT;
 760         if ((ret = checkintf(ps, setintf.interface)))
 761                 return ret;
 762         return usb_set_interface(ps->dev, setintf.interface,
 763                         setintf.altsetting);
 764 }
 765
 766 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 767 {
 768         unsigned int u;
 769         int status = 0;
 770         struct usb_host_config *actconfig;
 771
 772         if (get_user(u, (unsigned int __user *)arg))
 773                 return -EFAULT;
 774
 775         actconfig = ps->dev->actconfig;
 776
 777         /* Don't touch the device if any interfaces are claimed.
 778          * It could interfere with other drivers' operations, and if
 779          * an interface is claimed by usbfs it could easily deadlock.
 780          */
 781         if (actconfig) {
 782                 int i;
 783
 784                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 785                         if (usb_interface_claimed(actconfig->interface[i])) {
 786                                 dev_warn (&ps->dev->dev,
 787                                         "usbfs: interface %d claimed "
 788                                         "while '%s' sets config #%d\n",
 789                                         actconfig->interface[i]
 790                                                 ->cur_altsetting
 791                                                 ->desc.bInterfaceNumber,
 792                                         current->comm, u);
 793 #if 0   /* FIXME:  enable in 2.6.10 or so */
 794                                 status = -EBUSY;
 795                                 break;
 796 #endif
 797                         }
 798                 }
 799         }
 800
 801         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 802          * so avoid usb_set_configuration()'s kick to sysfs
 803          */
 804         if (status == 0) {
 805                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 806                         status = usb_reset_configuration(ps->dev);
 807                 else
 808                         status = usb_set_configuration(ps->dev, u);
 809         }
 810
 811         return status;
 812 }
 813
 814
 815 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 816                              struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
 817                              void __user *arg)
 818 {
 819         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 820         struct usb_host_endpoint *ep;
 821         struct async *as;
 822         struct usb_ctrlrequest *dr = NULL;
 823         unsigned int u, totlen, isofrmlen;
 824         int ret, interval = 0, ifnum = -1;
 825
 826         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
 827                            URB_NO_FSBR|URB_ZERO_PACKET))
 828                 return -EINVAL;
 829         if (!uurb->buffer)
 830                 return -EINVAL;
 831         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
 832                 return -EINVAL;
 833         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
 834                 if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
 835                         return ifnum;
 836                 if ((ret = checkintf(ps, ifnum)))
 837                         return ret;
 838         }
 839         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0)
 840                 ep = ps->dev->ep_in [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 841         else
 842                 ep = ps->dev->ep_out [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 843         if (!ep)
 844                 return -ENOENT;
 845         switch(uurb->type) {
 846         case USBDEVFS_URB_TYPE_CONTROL:
 847                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 848                                 != USB_ENDPOINT_XFER_CONTROL)
 849                         return -EINVAL;
 850                 /* min 8 byte setup packet, max arbitrary */
 851                 if (uurb->buffer_length < 8 || uurb->buffer_length > PAGE_SIZE)
 852                         return -EINVAL;
 853                 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
 854                         return -ENOMEM;
 855                 if (copy_from_user(dr, uurb->buffer, 8)) {
 856                         kfree(dr);
 857                         return -EFAULT;
 858                 }
 859                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
 860                         kfree(dr);
 861                         return -EINVAL;
 862                 }
 863                 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
 864                         kfree(dr);
 865                         return ret;
 866                 }
 867                 uurb->endpoint = (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK);
 868                 uurb->number_of_packets = 0;
 869                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
 870                 uurb->buffer += 8;
 871                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ?  VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) {
 872                         kfree(dr);
 873                         return -EFAULT;
 874                 }
 875                 break;
 876
 877         case USBDEVFS_URB_TYPE_BULK:
 878                 switch (ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 879                 case USB_ENDPOINT_XFER_CONTROL:
 880                 case USB_ENDPOINT_XFER_ISOC:
 881                         return -EINVAL;
 882                 /* allow single-shot interrupt transfers, at bogus rates */
 883                 }
 884                 uurb->number_of_packets = 0;
 885                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
 886                         return -EINVAL;
 887                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
 888                         return -EFAULT;
 889                 break;
 890
 891         case USBDEVFS_URB_TYPE_ISO:
 892                 /* arbitrary limit */
 893                 if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
 894                         return -EINVAL;
 895                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 896                                 != USB_ENDPOINT_XFER_ISOC)
 897                         return -EINVAL;
 898                 interval = 1 << min (15, ep->desc.bInterval - 1);
 899                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
 900                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
 901                         return -ENOMEM;
 902                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
 903                         kfree(isopkt);
 904                         return -EFAULT;
 905                 }
 906                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
 907                         if (isopkt[u].length > 1023) {
 908                                 kfree(isopkt);
 909                                 return -EINVAL;
 910                         }
 911                         totlen += isopkt[u].length;
 912                 }
 913                 if (totlen > 32768) {
 914                         kfree(isopkt);
 915                         return -EINVAL;
 916                 }
 917                 uurb->buffer_length = totlen;
 918                 break;
 919
 920         case USBDEVFS_URB_TYPE_INTERRUPT:
 921                 uurb->number_of_packets = 0;
 922                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 923                                 != USB_ENDPOINT_XFER_INT)
 924                         return -EINVAL;
 925                 if (ps->dev->speed == USB_SPEED_HIGH)
 926                         interval = 1 << min (15, ep->desc.bInterval - 1);
 927                 else
 928                         interval = ep->desc.bInterval;
 929                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
 930                         return -EINVAL;
 931                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
 932                         return -EFAULT;
 933                 break;
 934
 935         default:
 936                 return -EINVAL;
 937         }
 938         if (!(as = alloc_async(uurb->number_of_packets))) {
 939                 kfree(isopkt);
 940                 kfree(dr);
 941                 return -ENOMEM;
 942         }
 943         if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
 944                 kfree(isopkt);
 945                 kfree(dr);
 946                 free_async(as);
 947                 return -ENOMEM;
 948         }
 949         as->urb->dev = ps->dev;
 950         as->urb->pipe = (uurb->type << 30) | __create_pipe(ps->dev, uurb->endpoint & 0xf) | (uurb->endpoint & USB_DIR_IN);
 951         as->urb->transfer_flags = uurb->flags;
 952         as->urb->transfer_buffer_length = uurb->buffer_length;
 953         as->urb->setup_packet = (unsigned char*)dr;
 954         as->urb->start_frame = uurb->start_frame;
 955         as->urb->number_of_packets = uurb->number_of_packets;
 956         as->urb->interval = interval;
 957         as->urb->context = as;
 958         as->urb->complete = async_completed;
 959         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
 960                 as->urb->iso_frame_desc[u].offset = totlen;
 961                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
 962                 totlen += isopkt[u].length;
 963         }
 964         kfree(isopkt);
 965         as->ps = ps;
 966         as->userurb = arg;
 967         if (uurb->endpoint & USB_DIR_IN)
 968                 as->userbuffer = uurb->buffer;
 969         else
 970                 as->userbuffer = NULL;
 971         as->signr = uurb->signr;
 972         as->ifnum = ifnum;
 973         as->task = current;
 974         if (!(uurb->endpoint & USB_DIR_IN)) {
 975                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, as->urb->transfer_buffer_length)) {
 976                         free_async(as);
 977                         return -EFAULT;
 978                 }
 979         }
 980         async_newpending(as);
 981         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
 982                 dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
 983                 async_removepending(as);
 984                 free_async(as);
 985                 return ret;
 986         }
 987         return 0;
 988 }
 989
 990 static int proc_submiturb(struct dev_state *ps, void __user *arg)
 991 {
 992         struct usbdevfs_urb uurb;
 993
 994         if (copy_from_user(&uurb, arg, sizeof(uurb)))
 995                 return -EFAULT;
 996
 997         return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg);
 998 }
 999
1000 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1001 {
1002         struct async *as;
1003
1004         as = async_getpending(ps, arg);
1005         if (!as)
1006                 return -EINVAL;
1007         usb_kill_urb(as->urb);
1008         return 0;
1009 }
1010
1011 static int processcompl(struct async *as, void __user * __user *arg)
1012 {
1013         struct urb *urb = as->urb;
1014         struct usbdevfs_urb __user *userurb = as->userurb;
1015         void __user *addr = as->userurb;
1016         unsigned int i;
1017
1018         if (as->userbuffer)
1019                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1020                         return -EFAULT;
1021         if (put_user(urb->status, &userurb->status))
1022                 return -EFAULT;
1023         if (put_user(urb->actual_length, &userurb->actual_length))
1024                 return -EFAULT;
1025         if (put_user(urb->error_count, &userurb->error_count))
1026                 return -EFAULT;
1027
1028         if (usb_pipeisoc(urb->pipe)) {
1029                 for (i = 0; i < urb->number_of_packets; i++) {
1030                         if (put_user(urb->iso_frame_desc[i].actual_length,
1031                                      &userurb->iso_frame_desc[i].actual_length))
1032                                 return -EFAULT;
1033                         if (put_user(urb->iso_frame_desc[i].status,
1034                                      &userurb->iso_frame_desc[i].status))
1035                                 return -EFAULT;
1036                 }
1037         }
1038
1039         free_async(as);
1040
1041         if (put_user(addr, (void __user * __user *)arg))
1042                 return -EFAULT;
1043         return 0;
1044 }
1045
1046 static struct async* reap_as(struct dev_state *ps)
1047 {
1048         DECLARE_WAITQUEUE(wait, current);
1049         struct async *as = NULL;
1050         struct usb_device *dev = ps->dev;
1051
1052         add_wait_queue(&ps->wait, &wait);
1053         for (;;) {
1054                 __set_current_state(TASK_INTERRUPTIBLE);
1055                 if ((as = async_getcompleted(ps)))
1056                         break;
1057                 if (signal_pending(current))
1058                         break;
1059                 usb_unlock_device(dev);
1060                 schedule();
1061                 usb_lock_device(dev);
1062         }
1063         remove_wait_queue(&ps->wait, &wait);
1064         set_current_state(TASK_RUNNING);
1065         return as;
1066 }
1067
1068 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1069 {
1070         struct async *as = reap_as(ps);
1071         if (as)
1072                 return processcompl(as, (void __user * __user *)arg);
1073         if (signal_pending(current))
1074                 return -EINTR;
1075         return -EIO;
1076 }
1077
1078 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1079 {
1080         struct async *as;
1081
1082         if (!(as = async_getcompleted(ps)))
1083                 return -EAGAIN;
1084         return processcompl(as, (void __user * __user *)arg);
1085 }
1086
1087 #ifdef CONFIG_COMPAT
1088
1089 static int get_urb32(struct usbdevfs_urb *kurb,
1090                      struct usbdevfs_urb32 __user *uurb)
1091 {
1092         __u32  uptr;
1093         if (get_user(kurb->type, &uurb->type) ||
1094             __get_user(kurb->endpoint, &uurb->endpoint) ||
1095             __get_user(kurb->status, &uurb->status) ||
1096             __get_user(kurb->flags, &uurb->flags) ||
1097             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1098             __get_user(kurb->actual_length, &uurb->actual_length) ||
1099             __get_user(kurb->start_frame, &uurb->start_frame) ||
1100             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1101             __get_user(kurb->error_count, &uurb->error_count) ||
1102             __get_user(kurb->signr, &uurb->signr))
1103                 return -EFAULT;
1104
1105         if (__get_user(uptr, &uurb->buffer))
1106                 return -EFAULT;
1107         kurb->buffer = compat_ptr(uptr);
1108         if (__get_user(uptr, &uurb->buffer))
1109                 return -EFAULT;
1110         kurb->usercontext = compat_ptr(uptr);
1111
1112         return 0;
1113 }
1114
1115 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1116 {
1117         struct usbdevfs_urb uurb;
1118
1119         if (get_urb32(&uurb,(struct usbdevfs_urb32 *)arg))
1120                 return -EFAULT;
1121
1122         return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg);
1123 }
1124
1125 static int processcompl_compat(struct async *as, void __user * __user *arg)
1126 {
1127         struct urb *urb = as->urb;
1128         struct usbdevfs_urb32 __user *userurb = as->userurb;
1129         void __user *addr = as->userurb;
1130         unsigned int i;
1131
1132         if (as->userbuffer)
1133                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1134                         return -EFAULT;
1135         if (put_user(urb->status, &userurb->status))
1136                 return -EFAULT;
1137         if (put_user(urb->actual_length, &userurb->actual_length))
1138                 return -EFAULT;
1139         if (put_user(urb->error_count, &userurb->error_count))
1140                 return -EFAULT;
1141
1142         if (usb_pipeisoc(urb->pipe)) {
1143                 for (i = 0; i < urb->number_of_packets; i++) {
1144                         if (put_user(urb->iso_frame_desc[i].actual_length,
1145                                      &userurb->iso_frame_desc[i].actual_length))
1146                                 return -EFAULT;
1147                         if (put_user(urb->iso_frame_desc[i].status,
1148                                      &userurb->iso_frame_desc[i].status))
1149                                 return -EFAULT;
1150                 }
1151         }
1152
1153         free_async(as);
1154         if (put_user((u32)(u64)addr, (u32 __user *)arg))
1155                 return -EFAULT;
1156         return 0;
1157 }
1158
1159 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1160 {
1161         struct async *as = reap_as(ps);
1162         if (as)
1163                 return processcompl_compat(as, (void __user * __user *)arg);
1164         if (signal_pending(current))
1165                 return -EINTR;
1166         return -EIO;
1167 }
1168
1169 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1170 {
1171         struct async *as;
1172
1173         if (!(as = async_getcompleted(ps)))
1174                 return -EAGAIN;
1175         return processcompl_compat(as, (void __user * __user *)arg);
1176 }
1177
1178 #endif
1179
1180 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1181 {
1182         struct usbdevfs_disconnectsignal ds;
1183
1184         if (copy_from_user(&ds, arg, sizeof(ds)))
1185                 return -EFAULT;
1186         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1187                 return -EINVAL;
1188         ps->discsignr = ds.signr;
1189         ps->disccontext = ds.context;
1190         return 0;
1191 }
1192
1193 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1194 {
1195         unsigned int ifnum;
1196
1197         if (get_user(ifnum, (unsigned int __user *)arg))
1198                 return -EFAULT;
1199         return claimintf(ps, ifnum);
1200 }
1201
1202 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1203 {
1204         unsigned int ifnum;
1205         int ret;
1206
1207         if (get_user(ifnum, (unsigned int __user *)arg))
1208                 return -EFAULT;
1209         if ((ret = releaseintf(ps, ifnum)) < 0)
1210                 return ret;
1211         destroy_async_on_interface (ps, ifnum);
1212         return 0;
1213 }
1214
1215 static int proc_ioctl (struct dev_state *ps, void __user *arg)
1216 {
1217         struct usbdevfs_ioctl   ctrl;
1218         int                     size;
1219         void                    *buf = NULL;
1220         int                     retval = 0;
1221         struct usb_interface    *intf = NULL;
1222         struct usb_driver       *driver = NULL;
1223         int                     i;
1224
1225         /* get input parameters and alloc buffer */
1226         if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
1227                 return -EFAULT;
1228         if ((size = _IOC_SIZE (ctrl.ioctl_code)) > 0) {
1229                 if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
1230                         return -ENOMEM;
1231                 if ((_IOC_DIR(ctrl.ioctl_code) & _IOC_WRITE)) {
1232                         if (copy_from_user (buf, ctrl.data, size)) {
1233                                 kfree(buf);
1234                                 return -EFAULT;
1235                         }
1236                 } else {
1237                         memset (buf, 0, size);
1238                 }
1239         }
1240
1241         if (!connected(ps->dev)) {
1242                 kfree(buf);
1243                 return -ENODEV;
1244         }
1245
1246         if (ps->dev->state != USB_STATE_CONFIGURED)
1247                 retval = -EHOSTUNREACH;
1248         else if (!(intf = usb_ifnum_to_if (ps->dev, ctrl.ifno)))
1249                retval = -EINVAL;
1250         else switch (ctrl.ioctl_code) {
1251
1252         /* disconnect kernel driver from interface */
1253         case USBDEVFS_DISCONNECT:
1254
1255                 /* don't allow the user to unbind the hub driver from
1256                  * a hub with children to manage */
1257                 for (i = 0; i < ps->dev->maxchild; ++i) {
1258                         if (ps->dev->children[i])
1259                                 retval = -EBUSY;
1260                 }
1261                 if (retval)
1262                         break;
1263
1264                 down_write(&usb_bus_type.subsys.rwsem);
1265                 if (intf->dev.driver) {
1266                         driver = to_usb_driver(intf->dev.driver);
1267                         dev_dbg (&intf->dev, "disconnect by usbfs\n");
1268                         usb_driver_release_interface(driver, intf);
1269                 } else
1270                         retval = -ENODATA;
1271                 up_write(&usb_bus_type.subsys.rwsem);
1272                 break;
1273
1274         /* let kernel drivers try to (re)bind to the interface */
1275         case USBDEVFS_CONNECT:
1276                 usb_unlock_device(ps->dev);
1277                 usb_lock_all_devices();
1278                 bus_rescan_devices(intf->dev.bus);
1279                 usb_unlock_all_devices();
1280                 usb_lock_device(ps->dev);
1281                 break;
1282
1283         /* talk directly to the interface's driver */
1284         default:
1285                 down_read(&usb_bus_type.subsys.rwsem);
1286                 if (intf->dev.driver)
1287                         driver = to_usb_driver(intf->dev.driver);
1288                 if (driver == NULL || driver->ioctl == NULL) {
1289                         retval = -ENOTTY;
1290                 } else {
1291                         retval = driver->ioctl (intf, ctrl.ioctl_code, buf);
1292                         if (retval == -ENOIOCTLCMD)
1293                                 retval = -ENOTTY;
1294                 }
1295                 up_read(&usb_bus_type.subsys.rwsem);
1296         }
1297
1298         /* cleanup and return */
1299         if (retval >= 0
1300                         && (_IOC_DIR (ctrl.ioctl_code) & _IOC_READ) != 0
1301                         && size > 0
1302                         && copy_to_user (ctrl.data, buf, size) != 0)
1303                 retval = -EFAULT;
1304
1305         kfree(buf);
1306         return retval;
1307 }
1308
1309 /*
1310  * NOTE:  All requests here that have interface numbers as parameters
1311  * are assuming that somehow the configuration has been prevented from
1312  * changing.  But there's no mechanism to ensure that...
1313  */
1314 static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1315 {
1316         struct dev_state *ps = (struct dev_state *)file->private_data;
1317         struct usb_device *dev = ps->dev;
1318         void __user *p = (void __user *)arg;
1319         int ret = -ENOTTY;
1320
1321         if (!(file->f_mode & FMODE_WRITE))
1322                 return -EPERM;
1323         usb_lock_device(dev);
1324         if (!connected(dev)) {
1325                 usb_unlock_device(dev);
1326                 return -ENODEV;
1327         }
1328
1329         switch (cmd) {
1330         case USBDEVFS_CONTROL:
1331                 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
1332                 ret = proc_control(ps, p);
1333                 if (ret >= 0)
1334                         inode->i_mtime = CURRENT_TIME;
1335                 break;
1336
1337         case USBDEVFS_BULK:
1338                 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
1339                 ret = proc_bulk(ps, p);
1340                 if (ret >= 0)
1341                         inode->i_mtime = CURRENT_TIME;
1342                 break;
1343
1344         case USBDEVFS_RESETEP:
1345                 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
1346                 ret = proc_resetep(ps, p);
1347                 if (ret >= 0)
1348                         inode->i_mtime = CURRENT_TIME;
1349                 break;
1350
1351         case USBDEVFS_RESET:
1352                 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
1353                 ret = proc_resetdevice(ps);
1354                 break;
1355
1356         case USBDEVFS_CLEAR_HALT:
1357                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
1358                 ret = proc_clearhalt(ps, p);
1359                 if (ret >= 0)
1360                         inode->i_mtime = CURRENT_TIME;
1361                 break;
1362
1363         case USBDEVFS_GETDRIVER:
1364                 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
1365                 ret = proc_getdriver(ps, p);
1366                 break;
1367
1368         case USBDEVFS_CONNECTINFO:
1369                 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
1370                 ret = proc_connectinfo(ps, p);
1371                 break;
1372
1373         case USBDEVFS_SETINTERFACE:
1374                 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
1375                 ret = proc_setintf(ps, p);
1376                 break;
1377
1378         case USBDEVFS_SETCONFIGURATION:
1379                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
1380                 ret = proc_setconfig(ps, p);
1381                 break;
1382
1383         case USBDEVFS_SUBMITURB:
1384                 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
1385                 ret = proc_submiturb(ps, p);
1386                 if (ret >= 0)
1387                         inode->i_mtime = CURRENT_TIME;
1388                 break;
1389
1390 #ifdef CONFIG_COMPAT
1391
1392         case USBDEVFS_SUBMITURB32:
1393                 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
1394                 ret = proc_submiturb_compat(ps, p);
1395                 if (ret >= 0)
1396                         inode->i_mtime = CURRENT_TIME;
1397                 break;
1398
1399         case USBDEVFS_REAPURB32:
1400                 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
1401                 ret = proc_reapurb_compat(ps, p);
1402                 break;
1403
1404         case USBDEVFS_REAPURBNDELAY32:
1405                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
1406                 ret = proc_reapurbnonblock_compat(ps, p);
1407                 break;
1408
1409 #endif
1410
1411         case USBDEVFS_DISCARDURB:
1412                 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
1413                 ret = proc_unlinkurb(ps, p);
1414                 break;
1415
1416         case USBDEVFS_REAPURB:
1417                 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
1418                 ret = proc_reapurb(ps, p);
1419                 break;
1420
1421         case USBDEVFS_REAPURBNDELAY:
1422                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
1423                 ret = proc_reapurbnonblock(ps, p);
1424                 break;
1425
1426         case USBDEVFS_DISCSIGNAL:
1427                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
1428                 ret = proc_disconnectsignal(ps, p);
1429                 break;
1430
1431         case USBDEVFS_CLAIMINTERFACE:
1432                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
1433                 ret = proc_claiminterface(ps, p);
1434                 break;
1435
1436         case USBDEVFS_RELEASEINTERFACE:
1437                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
1438                 ret = proc_releaseinterface(ps, p);
1439                 break;
1440
1441         case USBDEVFS_IOCTL:
1442                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1443                 ret = proc_ioctl(ps, p);
1444                 break;
1445         }
1446         usb_unlock_device(dev);
1447         if (ret >= 0)
1448                 inode->i_atime = CURRENT_TIME;
1449         return ret;
1450 }
1451
1452 /* No kernel lock - fine */
1453 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
1454 {
1455         struct dev_state *ps = (struct dev_state *)file->private_data;
1456         unsigned int mask = 0;
1457
1458         poll_wait(file, &ps->wait, wait);
1459         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1460                 mask |= POLLOUT | POLLWRNORM;
1461         if (!connected(ps->dev))
1462                 mask |= POLLERR | POLLHUP;
1463         return mask;
1464 }
1465
1466 struct file_operations usbfs_device_file_operations = {
1467         .llseek =       usbdev_lseek,
1468         .read =         usbdev_read,
1469         .poll =         usbdev_poll,
1470         .ioctl =        usbdev_ioctl,
1471         .open =         usbdev_open,
1472         .release =      usbdev_release,
1473 };