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         if (as->urb->transfer_buffer)
 217                 kfree(as->urb->transfer_buffer);
 218         if (as->urb->setup_packet)
 219                 kfree(as->urb->setup_packet);
 220         usb_free_urb(as->urb);
 221         kfree(as);
 222 }
 223
 224 static inline void async_newpending(struct async *as)
 225 {
 226         struct dev_state *ps = as->ps;
 227         unsigned long flags;
 228
 229         spin_lock_irqsave(&ps->lock, flags);
 230         list_add_tail(&as->asynclist, &ps->async_pending);
 231         spin_unlock_irqrestore(&ps->lock, flags);
 232 }
 233
 234 static inline void async_removepending(struct async *as)
 235 {
 236         struct dev_state *ps = as->ps;
 237         unsigned long flags;
 238
 239         spin_lock_irqsave(&ps->lock, flags);
 240         list_del_init(&as->asynclist);
 241         spin_unlock_irqrestore(&ps->lock, flags);
 242 }
 243
 244 static inline struct async *async_getcompleted(struct dev_state *ps)
 245 {
 246         unsigned long flags;
 247         struct async *as = NULL;
 248
 249         spin_lock_irqsave(&ps->lock, flags);
 250         if (!list_empty(&ps->async_completed)) {
 251                 as = list_entry(ps->async_completed.next, struct async, asynclist);
 252                 list_del_init(&as->asynclist);
 253         }
 254         spin_unlock_irqrestore(&ps->lock, flags);
 255         return as;
 256 }
 257
 258 static inline struct async *async_getpending(struct dev_state *ps, void __user *userurb)
 259 {
 260         unsigned long flags;
 261         struct async *as;
 262
 263         spin_lock_irqsave(&ps->lock, flags);
 264         list_for_each_entry(as, &ps->async_pending, asynclist)
 265                 if (as->userurb == userurb) {
 266                         list_del_init(&as->asynclist);
 267                         spin_unlock_irqrestore(&ps->lock, flags);
 268                         return as;
 269                 }
 270         spin_unlock_irqrestore(&ps->lock, flags);
 271         return NULL;
 272 }
 273
 274 static void async_completed(struct urb *urb, struct pt_regs *regs)
 275 {
 276         struct async *as = (struct async *)urb->context;
 277         struct dev_state *ps = as->ps;
 278         struct siginfo sinfo;
 279
 280         spin_lock(&ps->lock);
 281         list_move_tail(&as->asynclist, &ps->async_completed);
 282         spin_unlock(&ps->lock);
 283         if (as->signr) {
 284                 sinfo.si_signo = as->signr;
 285                 sinfo.si_errno = as->urb->status;
 286                 sinfo.si_code = SI_ASYNCIO;
 287                 sinfo.si_addr = as->userurb;
 288                 send_sig_info(as->signr, &sinfo, as->task);
 289         }
 290         wake_up(&ps->wait);
 291 }
 292
 293 static void destroy_async (struct dev_state *ps, struct list_head *list)
 294 {
 295         struct async *as;
 296         unsigned long flags;
 297
 298         spin_lock_irqsave(&ps->lock, flags);
 299         while (!list_empty(list)) {
 300                 as = list_entry(list->next, struct async, asynclist);
 301                 list_del_init(&as->asynclist);
 302
 303                 /* drop the spinlock so the completion handler can run */
 304                 spin_unlock_irqrestore(&ps->lock, flags);
 305                 usb_kill_urb(as->urb);
 306                 spin_lock_irqsave(&ps->lock, flags);
 307         }
 308         spin_unlock_irqrestore(&ps->lock, flags);
 309         as = async_getcompleted(ps);
 310         while (as) {
 311                 free_async(as);
 312                 as = async_getcompleted(ps);
 313         }
 314 }
 315
 316 static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum)
 317 {
 318         struct list_head *p, *q, hitlist;
 319         unsigned long flags;
 320
 321         INIT_LIST_HEAD(&hitlist);
 322         spin_lock_irqsave(&ps->lock, flags);
 323         list_for_each_safe(p, q, &ps->async_pending)
 324                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 325                         list_move_tail(p, &hitlist);
 326         spin_unlock_irqrestore(&ps->lock, flags);
 327         destroy_async(ps, &hitlist);
 328 }
 329
 330 static inline void destroy_all_async(struct dev_state *ps)
 331 {
 332                 destroy_async(ps, &ps->async_pending);
 333 }
 334
 335 /*
 336  * interface claims are made only at the request of user level code,
 337  * which can also release them (explicitly or by closing files).
 338  * they're also undone when devices disconnect.
 339  */
 340
 341 static int driver_probe (struct usb_interface *intf,
 342                          const struct usb_device_id *id)
 343 {
 344         return -ENODEV;
 345 }
 346
 347 static void driver_disconnect(struct usb_interface *intf)
 348 {
 349         struct dev_state *ps = usb_get_intfdata (intf);
 350         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 351
 352         if (!ps)
 353                 return;
 354
 355         /* NOTE:  this relies on usbcore having canceled and completed
 356          * all pending I/O requests; 2.6 does that.
 357          */
 358
 359         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 360                 clear_bit(ifnum, &ps->ifclaimed);
 361         else
 362                 warn("interface number %u out of range", ifnum);
 363
 364         usb_set_intfdata (intf, NULL);
 365
 366         /* force async requests to complete */
 367         destroy_async_on_interface(ps, ifnum);
 368 }
 369
 370 struct usb_driver usbfs_driver = {
 371         .owner =        THIS_MODULE,
 372         .name =         "usbfs",
 373         .probe =        driver_probe,
 374         .disconnect =   driver_disconnect,
 375 };
 376
 377 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 378 {
 379         struct usb_device *dev = ps->dev;
 380         struct usb_interface *intf;
 381         int err;
 382
 383         if (ifnum >= 8*sizeof(ps->ifclaimed))
 384                 return -EINVAL;
 385         /* already claimed */
 386         if (test_bit(ifnum, &ps->ifclaimed))
 387                 return 0;
 388
 389         /* lock against other changes to driver bindings */
 390         down_write(&usb_bus_type.subsys.rwsem);
 391         intf = usb_ifnum_to_if(dev, ifnum);
 392         if (!intf)
 393                 err = -ENOENT;
 394         else
 395                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 396         up_write(&usb_bus_type.subsys.rwsem);
 397         if (err == 0)
 398                 set_bit(ifnum, &ps->ifclaimed);
 399         return err;
 400 }
 401
 402 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 403 {
 404         struct usb_device *dev;
 405         struct usb_interface *intf;
 406         int err;
 407
 408         err = -EINVAL;
 409         if (ifnum >= 8*sizeof(ps->ifclaimed))
 410                 return err;
 411         dev = ps->dev;
 412         /* lock against other changes to driver bindings */
 413         down_write(&usb_bus_type.subsys.rwsem);
 414         intf = usb_ifnum_to_if(dev, ifnum);
 415         if (!intf)
 416                 err = -ENOENT;
 417         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 418                 usb_driver_release_interface(&usbfs_driver, intf);
 419                 err = 0;
 420         }
 421         up_write(&usb_bus_type.subsys.rwsem);
 422         return err;
 423 }
 424
 425 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 426 {
 427         if (ps->dev->state != USB_STATE_CONFIGURED)
 428                 return -EHOSTUNREACH;
 429         if (ifnum >= 8*sizeof(ps->ifclaimed))
 430                 return -EINVAL;
 431         if (test_bit(ifnum, &ps->ifclaimed))
 432                 return 0;
 433         /* if not yet claimed, claim it for the driver */
 434         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n",
 435                current->pid, current->comm, ifnum);
 436         return claimintf(ps, ifnum);
 437 }
 438
 439 static int findintfep(struct usb_device *dev, unsigned int ep)
 440 {
 441         unsigned int i, j, e;
 442         struct usb_interface *intf;
 443         struct usb_host_interface *alts;
 444         struct usb_endpoint_descriptor *endpt;
 445
 446         if (ep & ~(USB_DIR_IN|0xf))
 447                 return -EINVAL;
 448         if (!dev->actconfig)
 449                 return -ESRCH;
 450         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 451                 intf = dev->actconfig->interface[i];
 452                 for (j = 0; j < intf->num_altsetting; j++) {
 453                         alts = &intf->altsetting[j];
 454                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 455                                 endpt = &alts->endpoint[e].desc;
 456                                 if (endpt->bEndpointAddress == ep)
 457                                         return alts->desc.bInterfaceNumber;
 458                         }
 459                 }
 460         }
 461         return -ENOENT;
 462 }
 463
 464 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
 465 {
 466         int ret = 0;
 467
 468         if (ps->dev->state != USB_STATE_CONFIGURED)
 469                 return -EHOSTUNREACH;
 470         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 471                 return 0;
 472
 473         index &= 0xff;
 474         switch (requesttype & USB_RECIP_MASK) {
 475         case USB_RECIP_ENDPOINT:
 476                 if ((ret = findintfep(ps->dev, index)) >= 0)
 477                         ret = checkintf(ps, ret);
 478                 break;
 479
 480         case USB_RECIP_INTERFACE:
 481                 ret = checkintf(ps, index);
 482                 break;
 483         }
 484         return ret;
 485 }
 486
 487 /*
 488  * file operations
 489  */
 490 static int usbdev_open(struct inode *inode, struct file *file)
 491 {
 492         struct usb_device *dev;
 493         struct dev_state *ps;
 494         int ret;
 495
 496         /*
 497          * no locking necessary here, as chrdev_open has the kernel lock
 498          * (still acquire the kernel lock for safety)
 499          */
 500         ret = -ENOMEM;
 501         if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
 502                 goto out_nolock;
 503
 504         lock_kernel();
 505         ret = -ENOENT;
 506         dev = usb_get_dev(inode->u.generic_ip);
 507         if (!dev) {
 508                 kfree(ps);
 509                 goto out;
 510         }
 511         ret = 0;
 512         ps->dev = dev;
 513         ps->file = file;
 514         spin_lock_init(&ps->lock);
 515         INIT_LIST_HEAD(&ps->async_pending);
 516         INIT_LIST_HEAD(&ps->async_completed);
 517         init_waitqueue_head(&ps->wait);
 518         ps->discsignr = 0;
 519         ps->disctask = current;
 520         ps->disccontext = NULL;
 521         ps->ifclaimed = 0;
 522         wmb();
 523         list_add_tail(&ps->list, &dev->filelist);
 524         file->private_data = ps;
 525  out:
 526         unlock_kernel();
 527  out_nolock:
 528         return ret;
 529 }
 530
 531 static int usbdev_release(struct inode *inode, struct file *file)
 532 {
 533         struct dev_state *ps = (struct dev_state *)file->private_data;
 534         struct usb_device *dev = ps->dev;
 535         unsigned int ifnum;
 536
 537         usb_lock_device(dev);
 538         list_del_init(&ps->list);
 539         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 540                         ifnum++) {
 541                 if (test_bit(ifnum, &ps->ifclaimed))
 542                         releaseintf(ps, ifnum);
 543         }
 544         destroy_all_async(ps);
 545         usb_unlock_device(dev);
 546         usb_put_dev(dev);
 547         ps->dev = NULL;
 548         kfree(ps);
 549         return 0;
 550 }
 551
 552 static int proc_control(struct dev_state *ps, void __user *arg)
 553 {
 554         struct usb_device *dev = ps->dev;
 555         struct usbdevfs_ctrltransfer ctrl;
 556         unsigned int tmo;
 557         unsigned char *tbuf;
 558         int i, j, ret;
 559
 560         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 561                 return -EFAULT;
 562         if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
 563                 return ret;
 564         if (ctrl.wLength > PAGE_SIZE)
 565                 return -EINVAL;
 566         if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
 567                 return -ENOMEM;
 568         tmo = ctrl.timeout;
 569         if (ctrl.bRequestType & 0x80) {
 570                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
 571                         free_page((unsigned long)tbuf);
 572                         return -EINVAL;
 573                 }
 574                 snoop(&dev->dev, "control read: bRequest=%02x bRrequestType=%02x wValue=%04x wIndex=%04x\n",
 575                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue, ctrl.wIndex);
 576
 577                 usb_unlock_device(dev);
 578                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 579                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 580                 usb_lock_device(dev);
 581                 if ((i > 0) && ctrl.wLength) {
 582                         if (usbfs_snoop) {
 583                                 dev_info(&dev->dev, "control read: data ");
 584                                 for (j = 0; j < ctrl.wLength; ++j)
 585                                         printk ("%02x ", (unsigned char)(tbuf)[j]);
 586                                 printk("\n");
 587                         }
 588                         if (copy_to_user(ctrl.data, tbuf, ctrl.wLength)) {
 589                                 free_page((unsigned long)tbuf);
 590                                 return -EFAULT;
 591                         }
 592                 }
 593         } else {
 594                 if (ctrl.wLength) {
 595                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 596                                 free_page((unsigned long)tbuf);
 597                                 return -EFAULT;
 598                         }
 599                 }
 600                 snoop(&dev->dev, "control write: bRequest=%02x bRrequestType=%02x wValue=%04x wIndex=%04x\n",
 601                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue, ctrl.wIndex);
 602                 if (usbfs_snoop) {
 603                         dev_info(&dev->dev, "control write: data: ");
 604                         for (j = 0; j < ctrl.wLength; ++j)
 605                                 printk ("%02x ", (unsigned char)(tbuf)[j]);
 606                         printk("\n");
 607                 }
 608                 usb_unlock_device(dev);
 609                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 610                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 611                 usb_lock_device(dev);
 612         }
 613         free_page((unsigned long)tbuf);
 614         if (i<0 && i != -EPIPE) {
 615                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 616                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 617                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 618                            ctrl.wLength, i);
 619         }
 620         return i;
 621 }
 622
 623 static int proc_bulk(struct dev_state *ps, void __user *arg)
 624 {
 625         struct usb_device *dev = ps->dev;
 626         struct usbdevfs_bulktransfer bulk;
 627         unsigned int tmo, len1, pipe;
 628         int len2;
 629         unsigned char *tbuf;
 630         int i, ret;
 631
 632         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 633                 return -EFAULT;
 634         if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
 635                 return ret;
 636         if ((ret = checkintf(ps, ret)))
 637                 return ret;
 638         if (bulk.ep & USB_DIR_IN)
 639                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 640         else
 641                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 642         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 643                 return -EINVAL;
 644         len1 = bulk.len;
 645         if (len1 > MAX_USBFS_BUFFER_SIZE)
 646                 return -EINVAL;
 647         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 648                 return -ENOMEM;
 649         tmo = bulk.timeout;
 650         if (bulk.ep & 0x80) {
 651                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 652                         kfree(tbuf);
 653                         return -EINVAL;
 654                 }
 655                 usb_unlock_device(dev);
 656                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 657                 usb_lock_device(dev);
 658                 if (!i && len2) {
 659                         if (copy_to_user(bulk.data, tbuf, len2)) {
 660                                 kfree(tbuf);
 661                                 return -EFAULT;
 662                         }
 663                 }
 664         } else {
 665                 if (len1) {
 666                         if (copy_from_user(tbuf, bulk.data, len1)) {
 667                                 kfree(tbuf);
 668                                 return -EFAULT;
 669                         }
 670                 }
 671                 usb_unlock_device(dev);
 672                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 673                 usb_lock_device(dev);
 674         }
 675         kfree(tbuf);
 676         if (i < 0)
 677                 return i;
 678         return len2;
 679 }
 680
 681 static int proc_resetep(struct dev_state *ps, void __user *arg)
 682 {
 683         unsigned int ep;
 684         int ret;
 685
 686         if (get_user(ep, (unsigned int __user *)arg))
 687                 return -EFAULT;
 688         if ((ret = findintfep(ps->dev, ep)) < 0)
 689                 return ret;
 690         if ((ret = checkintf(ps, ret)))
 691                 return ret;
 692         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
 693         return 0;
 694 }
 695
 696 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 697 {
 698         unsigned int ep;
 699         int pipe;
 700         int ret;
 701
 702         if (get_user(ep, (unsigned int __user *)arg))
 703                 return -EFAULT;
 704         if ((ret = findintfep(ps->dev, ep)) < 0)
 705                 return ret;
 706         if ((ret = checkintf(ps, ret)))
 707                 return ret;
 708         if (ep & USB_DIR_IN)
 709                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 710         else
 711                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 712
 713         return usb_clear_halt(ps->dev, pipe);
 714 }
 715
 716
 717 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 718 {
 719         struct usbdevfs_getdriver gd;
 720         struct usb_interface *intf;
 721         int ret;
 722
 723         if (copy_from_user(&gd, arg, sizeof(gd)))
 724                 return -EFAULT;
 725         down_read(&usb_bus_type.subsys.rwsem);
 726         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 727         if (!intf || !intf->dev.driver)
 728                 ret = -ENODATA;
 729         else {
 730                 strncpy(gd.driver, intf->dev.driver->name,
 731                                 sizeof(gd.driver));
 732                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 733         }
 734         up_read(&usb_bus_type.subsys.rwsem);
 735         return ret;
 736 }
 737
 738 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 739 {
 740         struct usbdevfs_connectinfo ci;
 741
 742         ci.devnum = ps->dev->devnum;
 743         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 744         if (copy_to_user(arg, &ci, sizeof(ci)))
 745                 return -EFAULT;
 746         return 0;
 747 }
 748
 749 static int proc_resetdevice(struct dev_state *ps)
 750 {
 751         return usb_reset_device(ps->dev);
 752
 753 }
 754
 755 static int proc_setintf(struct dev_state *ps, void __user *arg)
 756 {
 757         struct usbdevfs_setinterface setintf;
 758         int ret;
 759
 760         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 761                 return -EFAULT;
 762         if ((ret = checkintf(ps, setintf.interface)))
 763                 return ret;
 764         return usb_set_interface(ps->dev, setintf.interface,
 765                         setintf.altsetting);
 766 }
 767
 768 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 769 {
 770         unsigned int u;
 771         int status = 0;
 772         struct usb_host_config *actconfig;
 773
 774         if (get_user(u, (unsigned int __user *)arg))
 775                 return -EFAULT;
 776
 777         actconfig = ps->dev->actconfig;
 778
 779         /* Don't touch the device if any interfaces are claimed.
 780          * It could interfere with other drivers' operations, and if
 781          * an interface is claimed by usbfs it could easily deadlock.
 782          */
 783         if (actconfig) {
 784                 int i;
 785
 786                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 787                         if (usb_interface_claimed(actconfig->interface[i])) {
 788                                 dev_warn (&ps->dev->dev,
 789                                         "usbfs: interface %d claimed "
 790                                         "while '%s' sets config #%d\n",
 791                                         actconfig->interface[i]
 792                                                 ->cur_altsetting
 793                                                 ->desc.bInterfaceNumber,
 794                                         current->comm, u);
 795 #if 0   /* FIXME:  enable in 2.6.10 or so */
 796                                 status = -EBUSY;
 797                                 break;
 798 #endif
 799                         }
 800                 }
 801         }
 802
 803         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 804          * so avoid usb_set_configuration()'s kick to sysfs
 805          */
 806         if (status == 0) {
 807                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 808                         status = usb_reset_configuration(ps->dev);
 809                 else
 810                         status = usb_set_configuration(ps->dev, u);
 811         }
 812
 813         return status;
 814 }
 815
 816
 817 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 818                              struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
 819                              void __user *arg)
 820 {
 821         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 822         struct usb_host_endpoint *ep;
 823         struct async *as;
 824         struct usb_ctrlrequest *dr = NULL;
 825         unsigned int u, totlen, isofrmlen;
 826         int ret, interval = 0, ifnum = -1;
 827
 828         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
 829                            URB_NO_FSBR|URB_ZERO_PACKET))
 830                 return -EINVAL;
 831         if (!uurb->buffer)
 832                 return -EINVAL;
 833         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
 834                 return -EINVAL;
 835         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
 836                 if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
 837                         return ifnum;
 838                 if ((ret = checkintf(ps, ifnum)))
 839                         return ret;
 840         }
 841         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0)
 842                 ep = ps->dev->ep_in [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 843         else
 844                 ep = ps->dev->ep_out [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 845         if (!ep)
 846                 return -ENOENT;
 847         switch(uurb->type) {
 848         case USBDEVFS_URB_TYPE_CONTROL:
 849                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 850                                 != USB_ENDPOINT_XFER_CONTROL)
 851                         return -EINVAL;
 852                 /* min 8 byte setup packet, max arbitrary */
 853                 if (uurb->buffer_length < 8 || uurb->buffer_length > PAGE_SIZE)
 854                         return -EINVAL;
 855                 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
 856                         return -ENOMEM;
 857                 if (copy_from_user(dr, uurb->buffer, 8)) {
 858                         kfree(dr);
 859                         return -EFAULT;
 860                 }
 861                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
 862                         kfree(dr);
 863                         return -EINVAL;
 864                 }
 865                 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
 866                         kfree(dr);
 867                         return ret;
 868                 }
 869                 uurb->endpoint = (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK);
 870                 uurb->number_of_packets = 0;
 871                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
 872                 uurb->buffer += 8;
 873                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ?  VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) {
 874                         kfree(dr);
 875                         return -EFAULT;
 876                 }
 877                 break;
 878
 879         case USBDEVFS_URB_TYPE_BULK:
 880                 switch (ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 881                 case USB_ENDPOINT_XFER_CONTROL:
 882                 case USB_ENDPOINT_XFER_ISOC:
 883                         return -EINVAL;
 884                 /* allow single-shot interrupt transfers, at bogus rates */
 885                 }
 886                 uurb->number_of_packets = 0;
 887                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
 888                         return -EINVAL;
 889                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
 890                         return -EFAULT;
 891                 break;
 892
 893         case USBDEVFS_URB_TYPE_ISO:
 894                 /* arbitrary limit */
 895                 if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
 896                         return -EINVAL;
 897                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 898                                 != USB_ENDPOINT_XFER_ISOC)
 899                         return -EINVAL;
 900                 interval = 1 << min (15, ep->desc.bInterval - 1);
 901                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
 902                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
 903                         return -ENOMEM;
 904                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
 905                         kfree(isopkt);
 906                         return -EFAULT;
 907                 }
 908                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
 909                         if (isopkt[u].length > 1023) {
 910                                 kfree(isopkt);
 911                                 return -EINVAL;
 912                         }
 913                         totlen += isopkt[u].length;
 914                 }
 915                 if (totlen > 32768) {
 916                         kfree(isopkt);
 917                         return -EINVAL;
 918                 }
 919                 uurb->buffer_length = totlen;
 920                 break;
 921
 922         case USBDEVFS_URB_TYPE_INTERRUPT:
 923                 uurb->number_of_packets = 0;
 924                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 925                                 != USB_ENDPOINT_XFER_INT)
 926                         return -EINVAL;
 927                 if (ps->dev->speed == USB_SPEED_HIGH)
 928                         interval = 1 << min (15, ep->desc.bInterval - 1);
 929                 else
 930                         interval = ep->desc.bInterval;
 931                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
 932                         return -EINVAL;
 933                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
 934                         return -EFAULT;
 935                 break;
 936
 937         default:
 938                 return -EINVAL;
 939         }
 940         if (!(as = alloc_async(uurb->number_of_packets))) {
 941                 if (isopkt)
 942                         kfree(isopkt);
 943                 if (dr)
 944                         kfree(dr);
 945                 return -ENOMEM;
 946         }
 947         if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
 948                 if (isopkt)
 949                         kfree(isopkt);
 950                 if (dr)
 951                         kfree(dr);
 952                 free_async(as);
 953                 return -ENOMEM;
 954         }
 955         as->urb->dev = ps->dev;
 956         as->urb->pipe = (uurb->type << 30) | __create_pipe(ps->dev, uurb->endpoint & 0xf) | (uurb->endpoint & USB_DIR_IN);
 957         as->urb->transfer_flags = uurb->flags;
 958         as->urb->transfer_buffer_length = uurb->buffer_length;
 959         as->urb->setup_packet = (unsigned char*)dr;
 960         as->urb->start_frame = uurb->start_frame;
 961         as->urb->number_of_packets = uurb->number_of_packets;
 962         as->urb->interval = interval;
 963         as->urb->context = as;
 964         as->urb->complete = async_completed;
 965         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
 966                 as->urb->iso_frame_desc[u].offset = totlen;
 967                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
 968                 totlen += isopkt[u].length;
 969         }
 970         if (isopkt)
 971                 kfree(isopkt);
 972         as->ps = ps;
 973         as->userurb = arg;
 974         if (uurb->endpoint & USB_DIR_IN)
 975                 as->userbuffer = uurb->buffer;
 976         else
 977                 as->userbuffer = NULL;
 978         as->signr = uurb->signr;
 979         as->ifnum = ifnum;
 980         as->task = current;
 981         if (!(uurb->endpoint & USB_DIR_IN)) {
 982                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, as->urb->transfer_buffer_length)) {
 983                         free_async(as);
 984                         return -EFAULT;
 985                 }
 986         }
 987         async_newpending(as);
 988         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
 989                 dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
 990                 async_removepending(as);
 991                 free_async(as);
 992                 return ret;
 993         }
 994         return 0;
 995 }
 996
 997 static int proc_submiturb(struct dev_state *ps, void __user *arg)
 998 {
 999         struct usbdevfs_urb uurb;
1000
1001         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1002                 return -EFAULT;
1003
1004         return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg);
1005 }
1006
1007 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1008 {
1009         struct async *as;
1010
1011         as = async_getpending(ps, arg);
1012         if (!as)
1013                 return -EINVAL;
1014         usb_kill_urb(as->urb);
1015         return 0;
1016 }
1017
1018 static int processcompl(struct async *as, void __user * __user *arg)
1019 {
1020         struct urb *urb = as->urb;
1021         struct usbdevfs_urb __user *userurb = as->userurb;
1022         void __user *addr = as->userurb;
1023         unsigned int i;
1024
1025         if (as->userbuffer)
1026                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1027                         return -EFAULT;
1028         if (put_user(urb->status, &userurb->status))
1029                 return -EFAULT;
1030         if (put_user(urb->actual_length, &userurb->actual_length))
1031                 return -EFAULT;
1032         if (put_user(urb->error_count, &userurb->error_count))
1033                 return -EFAULT;
1034
1035         if (!(usb_pipeisoc(urb->pipe)))
1036                 return 0;
1037         for (i = 0; i < urb->number_of_packets; i++) {
1038                 if (put_user(urb->iso_frame_desc[i].actual_length,
1039                              &userurb->iso_frame_desc[i].actual_length))
1040                         return -EFAULT;
1041                 if (put_user(urb->iso_frame_desc[i].status,
1042                              &userurb->iso_frame_desc[i].status))
1043                         return -EFAULT;
1044         }
1045
1046         free_async(as);
1047
1048         if (put_user(addr, (void __user * __user *)arg))
1049                 return -EFAULT;
1050         return 0;
1051 }
1052
1053 static struct async* reap_as(struct dev_state *ps)
1054 {
1055         DECLARE_WAITQUEUE(wait, current);
1056         struct async *as = NULL;
1057         struct usb_device *dev = ps->dev;
1058
1059         add_wait_queue(&ps->wait, &wait);
1060         for (;;) {
1061                 __set_current_state(TASK_INTERRUPTIBLE);
1062                 if ((as = async_getcompleted(ps)))
1063                         break;
1064                 if (signal_pending(current))
1065                         break;
1066                 usb_unlock_device(dev);
1067                 schedule();
1068                 usb_lock_device(dev);
1069         }
1070         remove_wait_queue(&ps->wait, &wait);
1071         set_current_state(TASK_RUNNING);
1072         return as;
1073 }
1074
1075 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1076 {
1077         struct async *as = reap_as(ps);
1078         if (as)
1079                 return processcompl(as, (void __user * __user *)arg);
1080         if (signal_pending(current))
1081                 return -EINTR;
1082         return -EIO;
1083 }
1084
1085 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1086 {
1087         struct async *as;
1088
1089         if (!(as = async_getcompleted(ps)))
1090                 return -EAGAIN;
1091         return processcompl(as, (void __user * __user *)arg);
1092 }
1093
1094 #ifdef CONFIG_COMPAT
1095
1096 static int get_urb32(struct usbdevfs_urb *kurb,
1097                      struct usbdevfs_urb32 __user *uurb)
1098 {
1099         __u32  uptr;
1100         if (get_user(kurb->type, &uurb->type) ||
1101             __get_user(kurb->endpoint, &uurb->endpoint) ||
1102             __get_user(kurb->status, &uurb->status) ||
1103             __get_user(kurb->flags, &uurb->flags) ||
1104             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1105             __get_user(kurb->actual_length, &uurb->actual_length) ||
1106             __get_user(kurb->start_frame, &uurb->start_frame) ||
1107             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1108             __get_user(kurb->error_count, &uurb->error_count) ||
1109             __get_user(kurb->signr, &uurb->signr))
1110                 return -EFAULT;
1111
1112         if (__get_user(uptr, &uurb->buffer))
1113                 return -EFAULT;
1114         kurb->buffer = compat_ptr(uptr);
1115         if (__get_user(uptr, &uurb->buffer))
1116                 return -EFAULT;
1117         kurb->usercontext = compat_ptr(uptr);
1118
1119         return 0;
1120 }
1121
1122 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1123 {
1124         struct usbdevfs_urb uurb;
1125
1126         if (get_urb32(&uurb,(struct usbdevfs_urb32 *)arg))
1127                 return -EFAULT;
1128
1129         return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb __user *)arg)->iso_frame_desc, arg);
1130 }
1131
1132 static int processcompl_compat(struct async *as, void __user * __user *arg)
1133 {
1134         struct urb *urb = as->urb;
1135         struct usbdevfs_urb32 __user *userurb = as->userurb;
1136         void __user *addr = as->userurb;
1137         unsigned int i;
1138
1139         if (as->userbuffer)
1140                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1141                         return -EFAULT;
1142         if (put_user(urb->status, &userurb->status))
1143                 return -EFAULT;
1144         if (put_user(urb->actual_length, &userurb->actual_length))
1145                 return -EFAULT;
1146         if (put_user(urb->error_count, &userurb->error_count))
1147                 return -EFAULT;
1148
1149         if (!(usb_pipeisoc(urb->pipe)))
1150                 return 0;
1151         for (i = 0; i < urb->number_of_packets; i++) {
1152                 if (put_user(urb->iso_frame_desc[i].actual_length,
1153                              &userurb->iso_frame_desc[i].actual_length))
1154                         return -EFAULT;
1155                 if (put_user(urb->iso_frame_desc[i].status,
1156                              &userurb->iso_frame_desc[i].status))
1157                         return -EFAULT;
1158         }
1159
1160         free_async(as);
1161         if (put_user((u32)(u64)addr, (u32 __user *)arg))
1162                 return -EFAULT;
1163         return 0;
1164 }
1165
1166 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1167 {
1168         struct async *as = reap_as(ps);
1169         if (as)
1170                 return processcompl_compat(as, (void __user * __user *)arg);
1171         if (signal_pending(current))
1172                 return -EINTR;
1173         return -EIO;
1174 }
1175
1176 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1177 {
1178         struct async *as;
1179
1180         printk("reapurbnblock\n");
1181         if (!(as = async_getcompleted(ps)))
1182                 return -EAGAIN;
1183         printk("reap got as %p\n", as);
1184         return processcompl_compat(as, (void __user * __user *)arg);
1185 }
1186
1187 #endif
1188
1189 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1190 {
1191         struct usbdevfs_disconnectsignal ds;
1192
1193         if (copy_from_user(&ds, arg, sizeof(ds)))
1194                 return -EFAULT;
1195         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1196                 return -EINVAL;
1197         ps->discsignr = ds.signr;
1198         ps->disccontext = ds.context;
1199         return 0;
1200 }
1201
1202 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1203 {
1204         unsigned int ifnum;
1205
1206         if (get_user(ifnum, (unsigned int __user *)arg))
1207                 return -EFAULT;
1208         return claimintf(ps, ifnum);
1209 }
1210
1211 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1212 {
1213         unsigned int ifnum;
1214         int ret;
1215
1216         if (get_user(ifnum, (unsigned int __user *)arg))
1217                 return -EFAULT;
1218         if ((ret = releaseintf(ps, ifnum)) < 0)
1219                 return ret;
1220         destroy_async_on_interface (ps, ifnum);
1221         return 0;
1222 }
1223
1224 static int proc_ioctl (struct dev_state *ps, void __user *arg)
1225 {
1226         struct usbdevfs_ioctl   ctrl;
1227         int                     size;
1228         void                    *buf = NULL;
1229         int                     retval = 0;
1230         struct usb_interface    *intf = NULL;
1231         struct usb_driver       *driver = NULL;
1232         int                     i;
1233
1234         /* get input parameters and alloc buffer */
1235         if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
1236                 return -EFAULT;
1237         if ((size = _IOC_SIZE (ctrl.ioctl_code)) > 0) {
1238                 if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
1239                         return -ENOMEM;
1240                 if ((_IOC_DIR(ctrl.ioctl_code) & _IOC_WRITE)) {
1241                         if (copy_from_user (buf, ctrl.data, size)) {
1242                                 kfree (buf);
1243                                 return -EFAULT;
1244                         }
1245                 } else {
1246                         memset (buf, 0, size);
1247                 }
1248         }
1249
1250         if (!connected(ps->dev)) {
1251                 if (buf)
1252                         kfree(buf);
1253                 return -ENODEV;
1254         }
1255
1256         if (ps->dev->state != USB_STATE_CONFIGURED)
1257                 retval = -EHOSTUNREACH;
1258         else if (!(intf = usb_ifnum_to_if (ps->dev, ctrl.ifno)))
1259                retval = -EINVAL;
1260         else switch (ctrl.ioctl_code) {
1261
1262         /* disconnect kernel driver from interface */
1263         case USBDEVFS_DISCONNECT:
1264
1265                 /* don't allow the user to unbind the hub driver from
1266                  * a hub with children to manage */
1267                 for (i = 0; i < ps->dev->maxchild; ++i) {
1268                         if (ps->dev->children[i])
1269                                 retval = -EBUSY;
1270                 }
1271                 if (retval)
1272                         break;
1273
1274                 down_write(&usb_bus_type.subsys.rwsem);
1275                 if (intf->dev.driver) {
1276                         driver = to_usb_driver(intf->dev.driver);
1277                         dev_dbg (&intf->dev, "disconnect by usbfs\n");
1278                         usb_driver_release_interface(driver, intf);
1279                 } else
1280                         retval = -ENODATA;
1281                 up_write(&usb_bus_type.subsys.rwsem);
1282                 break;
1283
1284         /* let kernel drivers try to (re)bind to the interface */
1285         case USBDEVFS_CONNECT:
1286                 usb_unlock_device(ps->dev);
1287                 usb_lock_all_devices();
1288                 bus_rescan_devices(intf->dev.bus);
1289                 usb_unlock_all_devices();
1290                 usb_lock_device(ps->dev);
1291                 break;
1292
1293         /* talk directly to the interface's driver */
1294         default:
1295                 down_read(&usb_bus_type.subsys.rwsem);
1296                 if (intf->dev.driver)
1297                         driver = to_usb_driver(intf->dev.driver);
1298                 if (driver == NULL || driver->ioctl == NULL) {
1299                         retval = -ENOTTY;
1300                 } else {
1301                         retval = driver->ioctl (intf, ctrl.ioctl_code, buf);
1302                         if (retval == -ENOIOCTLCMD)
1303                                 retval = -ENOTTY;
1304                 }
1305                 up_read(&usb_bus_type.subsys.rwsem);
1306         }
1307
1308         /* cleanup and return */
1309         if (retval >= 0
1310                         && (_IOC_DIR (ctrl.ioctl_code) & _IOC_READ) != 0
1311                         && size > 0
1312                         && copy_to_user (ctrl.data, buf, size) != 0)
1313                 retval = -EFAULT;
1314         if (buf != NULL)
1315                 kfree (buf);
1316         return retval;
1317 }
1318
1319 /*
1320  * NOTE:  All requests here that have interface numbers as parameters
1321  * are assuming that somehow the configuration has been prevented from
1322  * changing.  But there's no mechanism to ensure that...
1323  */
1324 static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1325 {
1326         struct dev_state *ps = (struct dev_state *)file->private_data;
1327         struct usb_device *dev = ps->dev;
1328         void __user *p = (void __user *)arg;
1329         int ret = -ENOTTY;
1330
1331         if (!(file->f_mode & FMODE_WRITE))
1332                 return -EPERM;
1333         usb_lock_device(dev);
1334         if (!connected(dev)) {
1335                 usb_unlock_device(dev);
1336                 return -ENODEV;
1337         }
1338
1339         switch (cmd) {
1340         case USBDEVFS_CONTROL:
1341                 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
1342                 ret = proc_control(ps, p);
1343                 if (ret >= 0)
1344                         inode->i_mtime = CURRENT_TIME;
1345                 break;
1346
1347         case USBDEVFS_BULK:
1348                 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
1349                 ret = proc_bulk(ps, p);
1350                 if (ret >= 0)
1351                         inode->i_mtime = CURRENT_TIME;
1352                 break;
1353
1354         case USBDEVFS_RESETEP:
1355                 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
1356                 ret = proc_resetep(ps, p);
1357                 if (ret >= 0)
1358                         inode->i_mtime = CURRENT_TIME;
1359                 break;
1360
1361         case USBDEVFS_RESET:
1362                 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
1363                 ret = proc_resetdevice(ps);
1364                 break;
1365
1366         case USBDEVFS_CLEAR_HALT:
1367                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
1368                 ret = proc_clearhalt(ps, p);
1369                 if (ret >= 0)
1370                         inode->i_mtime = CURRENT_TIME;
1371                 break;
1372
1373         case USBDEVFS_GETDRIVER:
1374                 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
1375                 ret = proc_getdriver(ps, p);
1376                 break;
1377
1378         case USBDEVFS_CONNECTINFO:
1379                 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
1380                 ret = proc_connectinfo(ps, p);
1381                 break;
1382
1383         case USBDEVFS_SETINTERFACE:
1384                 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
1385                 ret = proc_setintf(ps, p);
1386                 break;
1387
1388         case USBDEVFS_SETCONFIGURATION:
1389                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
1390                 ret = proc_setconfig(ps, p);
1391                 break;
1392
1393         case USBDEVFS_SUBMITURB:
1394                 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
1395                 ret = proc_submiturb(ps, p);
1396                 if (ret >= 0)
1397                         inode->i_mtime = CURRENT_TIME;
1398                 break;
1399
1400 #ifdef CONFIG_COMPAT
1401
1402         case USBDEVFS_SUBMITURB32:
1403                 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
1404                 ret = proc_submiturb_compat(ps, p);
1405                 if (ret >= 0)
1406                         inode->i_mtime = CURRENT_TIME;
1407                 break;
1408
1409         case USBDEVFS_REAPURB32:
1410                 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
1411                 ret = proc_reapurb_compat(ps, p);
1412                 break;
1413
1414         case USBDEVFS_REAPURBNDELAY32:
1415                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
1416                 ret = proc_reapurbnonblock_compat(ps, p);
1417                 break;
1418
1419 #endif
1420
1421         case USBDEVFS_DISCARDURB:
1422                 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
1423                 ret = proc_unlinkurb(ps, p);
1424                 break;
1425
1426         case USBDEVFS_REAPURB:
1427                 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
1428                 ret = proc_reapurb(ps, p);
1429                 break;
1430
1431         case USBDEVFS_REAPURBNDELAY:
1432                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
1433                 ret = proc_reapurbnonblock(ps, p);
1434                 break;
1435
1436         case USBDEVFS_DISCSIGNAL:
1437                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
1438                 ret = proc_disconnectsignal(ps, p);
1439                 break;
1440
1441         case USBDEVFS_CLAIMINTERFACE:
1442                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
1443                 ret = proc_claiminterface(ps, p);
1444                 break;
1445
1446         case USBDEVFS_RELEASEINTERFACE:
1447                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
1448                 ret = proc_releaseinterface(ps, p);
1449                 break;
1450
1451         case USBDEVFS_IOCTL:
1452                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1453                 ret = proc_ioctl(ps, p);
1454                 break;
1455         }
1456         usb_unlock_device(dev);
1457         if (ret >= 0)
1458                 inode->i_atime = CURRENT_TIME;
1459         return ret;
1460 }
1461
1462 /* No kernel lock - fine */
1463 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
1464 {
1465         struct dev_state *ps = (struct dev_state *)file->private_data;
1466         unsigned int mask = 0;
1467
1468         poll_wait(file, &ps->wait, wait);
1469         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1470                 mask |= POLLOUT | POLLWRNORM;
1471         if (!connected(ps->dev))
1472                 mask |= POLLERR | POLLHUP;
1473         return mask;
1474 }
1475
1476 struct file_operations usbfs_device_file_operations = {
1477         .llseek =       usbdev_lseek,
1478         .read =         usbdev_read,
1479         .poll =         usbdev_poll,
1480         .ioctl =        usbdev_ioctl,
1481         .open =         usbdev_open,
1482         .release =      usbdev_release,
1483 };