git.oblomov.eu Git - linux-2.6/blob - drivers/usb/core/devio.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *      devio.c  --  User space communication with USB devices.
   5  *
   6  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   7  *
   8  *      This program is free software; you can redistribute it and/or modify
   9  *      it under the terms of the GNU General Public License as published by
  10  *      the Free Software Foundation; either version 2 of the License, or
  11  *      (at your option) any later version.
  12  *
  13  *      This program is distributed in the hope that it will be useful,
  14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *      GNU General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License
  19  *      along with this program; if not, write to the Free Software
  20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  *  $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 "
 573                                 "bRrequestType=%02x wValue=%04x "
 574                                 "wIndex=%04x wLength=%04x\n",
 575                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 576                                 ctrl.wIndex, ctrl.wLength);
 577
 578                 usb_unlock_device(dev);
 579                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 580                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 581                 usb_lock_device(dev);
 582                 if ((i > 0) && ctrl.wLength) {
 583                         if (usbfs_snoop) {
 584                                 dev_info(&dev->dev, "control read: data ");
 585                                 for (j = 0; j < i; ++j)
 586                                         printk ("%02x ", (unsigned char)(tbuf)[j]);
 587                                 printk("\n");
 588                         }
 589                         if (copy_to_user(ctrl.data, tbuf, i)) {
 590                                 free_page((unsigned long)tbuf);
 591                                 return -EFAULT;
 592                         }
 593                 }
 594         } else {
 595                 if (ctrl.wLength) {
 596                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 597                                 free_page((unsigned long)tbuf);
 598                                 return -EFAULT;
 599                         }
 600                 }
 601                 snoop(&dev->dev, "control write: bRequest=%02x "
 602                                 "bRrequestType=%02x wValue=%04x "
 603                                 "wIndex=%04x wLength=%04x\n",
 604                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 605                                 ctrl.wIndex, ctrl.wLength);
 606                 if (usbfs_snoop) {
 607                         dev_info(&dev->dev, "control write: data: ");
 608                         for (j = 0; j < ctrl.wLength; ++j)
 609                                 printk ("%02x ", (unsigned char)(tbuf)[j]);
 610                         printk("\n");
 611                 }
 612                 usb_unlock_device(dev);
 613                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 614                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 615                 usb_lock_device(dev);
 616         }
 617         free_page((unsigned long)tbuf);
 618         if (i<0 && i != -EPIPE) {
 619                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 620                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 621                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 622                            ctrl.wLength, i);
 623         }
 624         return i;
 625 }
 626
 627 static int proc_bulk(struct dev_state *ps, void __user *arg)
 628 {
 629         struct usb_device *dev = ps->dev;
 630         struct usbdevfs_bulktransfer bulk;
 631         unsigned int tmo, len1, pipe;
 632         int len2;
 633         unsigned char *tbuf;
 634         int i, ret;
 635
 636         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 637                 return -EFAULT;
 638         if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
 639                 return ret;
 640         if ((ret = checkintf(ps, ret)))
 641                 return ret;
 642         if (bulk.ep & USB_DIR_IN)
 643                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 644         else
 645                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 646         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 647                 return -EINVAL;
 648         len1 = bulk.len;
 649         if (len1 > MAX_USBFS_BUFFER_SIZE)
 650                 return -EINVAL;
 651         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 652                 return -ENOMEM;
 653         tmo = bulk.timeout;
 654         if (bulk.ep & 0x80) {
 655                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 656                         kfree(tbuf);
 657                         return -EINVAL;
 658                 }
 659                 usb_unlock_device(dev);
 660                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 661                 usb_lock_device(dev);
 662                 if (!i && len2) {
 663                         if (copy_to_user(bulk.data, tbuf, len2)) {
 664                                 kfree(tbuf);
 665                                 return -EFAULT;
 666                         }
 667                 }
 668         } else {
 669                 if (len1) {
 670                         if (copy_from_user(tbuf, bulk.data, len1)) {
 671                                 kfree(tbuf);
 672                                 return -EFAULT;
 673                         }
 674                 }
 675                 usb_unlock_device(dev);
 676                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 677                 usb_lock_device(dev);
 678         }
 679         kfree(tbuf);
 680         if (i < 0)
 681                 return i;
 682         return len2;
 683 }
 684
 685 static int proc_resetep(struct dev_state *ps, void __user *arg)
 686 {
 687         unsigned int ep;
 688         int ret;
 689
 690         if (get_user(ep, (unsigned int __user *)arg))
 691                 return -EFAULT;
 692         if ((ret = findintfep(ps->dev, ep)) < 0)
 693                 return ret;
 694         if ((ret = checkintf(ps, ret)))
 695                 return ret;
 696         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
 697         return 0;
 698 }
 699
 700 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 701 {
 702         unsigned int ep;
 703         int pipe;
 704         int ret;
 705
 706         if (get_user(ep, (unsigned int __user *)arg))
 707                 return -EFAULT;
 708         if ((ret = findintfep(ps->dev, ep)) < 0)
 709                 return ret;
 710         if ((ret = checkintf(ps, ret)))
 711                 return ret;
 712         if (ep & USB_DIR_IN)
 713                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 714         else
 715                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 716
 717         return usb_clear_halt(ps->dev, pipe);
 718 }
 719
 720
 721 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 722 {
 723         struct usbdevfs_getdriver gd;
 724         struct usb_interface *intf;
 725         int ret;
 726
 727         if (copy_from_user(&gd, arg, sizeof(gd)))
 728                 return -EFAULT;
 729         down_read(&usb_bus_type.subsys.rwsem);
 730         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 731         if (!intf || !intf->dev.driver)
 732                 ret = -ENODATA;
 733         else {
 734                 strncpy(gd.driver, intf->dev.driver->name,
 735                                 sizeof(gd.driver));
 736                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 737         }
 738         up_read(&usb_bus_type.subsys.rwsem);
 739         return ret;
 740 }
 741
 742 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 743 {
 744         struct usbdevfs_connectinfo ci;
 745
 746         ci.devnum = ps->dev->devnum;
 747         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 748         if (copy_to_user(arg, &ci, sizeof(ci)))
 749                 return -EFAULT;
 750         return 0;
 751 }
 752
 753 static int proc_resetdevice(struct dev_state *ps)
 754 {
 755         return usb_reset_device(ps->dev);
 756
 757 }
 758
 759 static int proc_setintf(struct dev_state *ps, void __user *arg)
 760 {
 761         struct usbdevfs_setinterface setintf;
 762         int ret;
 763
 764         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 765                 return -EFAULT;
 766         if ((ret = checkintf(ps, setintf.interface)))
 767                 return ret;
 768         return usb_set_interface(ps->dev, setintf.interface,
 769                         setintf.altsetting);
 770 }
 771
 772 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 773 {
 774         unsigned int u;
 775         int status = 0;
 776         struct usb_host_config *actconfig;
 777
 778         if (get_user(u, (unsigned int __user *)arg))
 779                 return -EFAULT;
 780
 781         actconfig = ps->dev->actconfig;
 782
 783         /* Don't touch the device if any interfaces are claimed.
 784          * It could interfere with other drivers' operations, and if
 785          * an interface is claimed by usbfs it could easily deadlock.
 786          */
 787         if (actconfig) {
 788                 int i;
 789
 790                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 791                         if (usb_interface_claimed(actconfig->interface[i])) {
 792                                 dev_warn (&ps->dev->dev,
 793                                         "usbfs: interface %d claimed by %s "
 794                                         "while '%s' sets config #%d\n",
 795                                         actconfig->interface[i]
 796                                                 ->cur_altsetting
 797                                                 ->desc.bInterfaceNumber,
 798                                         actconfig->interface[i]
 799                                                 ->dev.driver->name,
 800                                         current->comm, u);
 801                                 status = -EBUSY;
 802                                 break;
 803                         }
 804                 }
 805         }
 806
 807         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 808          * so avoid usb_set_configuration()'s kick to sysfs
 809          */
 810         if (status == 0) {
 811                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 812                         status = usb_reset_configuration(ps->dev);
 813                 else
 814                         status = usb_set_configuration(ps->dev, u);
 815         }
 816
 817         return status;
 818 }
 819
 820
 821 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 822                              struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
 823                              void __user *arg)
 824 {
 825         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 826         struct usb_host_endpoint *ep;
 827         struct async *as;
 828         struct usb_ctrlrequest *dr = NULL;
 829         unsigned int u, totlen, isofrmlen;
 830         int ret, interval = 0, ifnum = -1;
 831
 832         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
 833                            URB_NO_FSBR|URB_ZERO_PACKET))
 834                 return -EINVAL;
 835         if (!uurb->buffer)
 836                 return -EINVAL;
 837         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
 838                 return -EINVAL;
 839         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
 840                 if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
 841                         return ifnum;
 842                 if ((ret = checkintf(ps, ifnum)))
 843                         return ret;
 844         }
 845         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0)
 846                 ep = ps->dev->ep_in [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 847         else
 848                 ep = ps->dev->ep_out [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 849         if (!ep)
 850                 return -ENOENT;
 851         switch(uurb->type) {
 852         case USBDEVFS_URB_TYPE_CONTROL:
 853                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 854                                 != USB_ENDPOINT_XFER_CONTROL)
 855                         return -EINVAL;
 856                 /* min 8 byte setup packet, max arbitrary */
 857                 if (uurb->buffer_length < 8 || uurb->buffer_length > PAGE_SIZE)
 858                         return -EINVAL;
 859                 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
 860                         return -ENOMEM;
 861                 if (copy_from_user(dr, uurb->buffer, 8)) {
 862                         kfree(dr);
 863                         return -EFAULT;
 864                 }
 865                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
 866                         kfree(dr);
 867                         return -EINVAL;
 868                 }
 869                 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
 870                         kfree(dr);
 871                         return ret;
 872                 }
 873                 uurb->endpoint = (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK);
 874                 uurb->number_of_packets = 0;
 875                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
 876                 uurb->buffer += 8;
 877                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ?  VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) {
 878                         kfree(dr);
 879                         return -EFAULT;
 880                 }
 881                 break;
 882
 883         case USBDEVFS_URB_TYPE_BULK:
 884                 switch (ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 885                 case USB_ENDPOINT_XFER_CONTROL:
 886                 case USB_ENDPOINT_XFER_ISOC:
 887                         return -EINVAL;
 888                 /* allow single-shot interrupt transfers, at bogus rates */
 889                 }
 890                 uurb->number_of_packets = 0;
 891                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
 892                         return -EINVAL;
 893                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
 894                         return -EFAULT;
 895                 break;
 896
 897         case USBDEVFS_URB_TYPE_ISO:
 898                 /* arbitrary limit */
 899                 if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
 900                         return -EINVAL;
 901                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 902                                 != USB_ENDPOINT_XFER_ISOC)
 903                         return -EINVAL;
 904                 interval = 1 << min (15, ep->desc.bInterval - 1);
 905                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
 906                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
 907                         return -ENOMEM;
 908                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
 909                         kfree(isopkt);
 910                         return -EFAULT;
 911                 }
 912                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
 913                         if (isopkt[u].length > 1023) {
 914                                 kfree(isopkt);
 915                                 return -EINVAL;
 916                         }
 917                         totlen += isopkt[u].length;
 918                 }
 919                 if (totlen > 32768) {
 920                         kfree(isopkt);
 921                         return -EINVAL;
 922                 }
 923                 uurb->buffer_length = totlen;
 924                 break;
 925
 926         case USBDEVFS_URB_TYPE_INTERRUPT:
 927                 uurb->number_of_packets = 0;
 928                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 929                                 != USB_ENDPOINT_XFER_INT)
 930                         return -EINVAL;
 931                 if (ps->dev->speed == USB_SPEED_HIGH)
 932                         interval = 1 << min (15, ep->desc.bInterval - 1);
 933                 else
 934                         interval = ep->desc.bInterval;
 935                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
 936                         return -EINVAL;
 937                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
 938                         return -EFAULT;
 939                 break;
 940
 941         default:
 942                 return -EINVAL;
 943         }
 944         if (!(as = alloc_async(uurb->number_of_packets))) {
 945                 kfree(isopkt);
 946                 kfree(dr);
 947                 return -ENOMEM;
 948         }
 949         if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
 950                 kfree(isopkt);
 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         kfree(isopkt);
 971         as->ps = ps;
 972         as->userurb = arg;
 973         if (uurb->endpoint & USB_DIR_IN)
 974                 as->userbuffer = uurb->buffer;
 975         else
 976                 as->userbuffer = NULL;
 977         as->signr = uurb->signr;
 978         as->ifnum = ifnum;
 979         as->task = current;
 980         if (!(uurb->endpoint & USB_DIR_IN)) {
 981                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, as->urb->transfer_buffer_length)) {
 982                         free_async(as);
 983                         return -EFAULT;
 984                 }
 985         }
 986         async_newpending(as);
 987         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
 988                 dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
 989                 async_removepending(as);
 990                 free_async(as);
 991                 return ret;
 992         }
 993         return 0;
 994 }
 995
 996 static int proc_submiturb(struct dev_state *ps, void __user *arg)
 997 {
 998         struct usbdevfs_urb uurb;
 999
1000         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1001                 return -EFAULT;
1002
1003         return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg);
1004 }
1005
1006 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1007 {
1008         struct async *as;
1009
1010         as = async_getpending(ps, arg);
1011         if (!as)
1012                 return -EINVAL;
1013         usb_kill_urb(as->urb);
1014         return 0;
1015 }
1016
1017 static int processcompl(struct async *as, void __user * __user *arg)
1018 {
1019         struct urb *urb = as->urb;
1020         struct usbdevfs_urb __user *userurb = as->userurb;
1021         void __user *addr = as->userurb;
1022         unsigned int i;
1023
1024         if (as->userbuffer)
1025                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1026                         return -EFAULT;
1027         if (put_user(urb->status, &userurb->status))
1028                 return -EFAULT;
1029         if (put_user(urb->actual_length, &userurb->actual_length))
1030                 return -EFAULT;
1031         if (put_user(urb->error_count, &userurb->error_count))
1032                 return -EFAULT;
1033
1034         if (usb_pipeisoc(urb->pipe)) {
1035                 for (i = 0; i < urb->number_of_packets; i++) {
1036                         if (put_user(urb->iso_frame_desc[i].actual_length,
1037                                      &userurb->iso_frame_desc[i].actual_length))
1038                                 return -EFAULT;
1039                         if (put_user(urb->iso_frame_desc[i].status,
1040                                      &userurb->iso_frame_desc[i].status))
1041                                 return -EFAULT;
1042                 }
1043         }
1044
1045         free_async(as);
1046
1047         if (put_user(addr, (void __user * __user *)arg))
1048                 return -EFAULT;
1049         return 0;
1050 }
1051
1052 static struct async* reap_as(struct dev_state *ps)
1053 {
1054         DECLARE_WAITQUEUE(wait, current);
1055         struct async *as = NULL;
1056         struct usb_device *dev = ps->dev;
1057
1058         add_wait_queue(&ps->wait, &wait);
1059         for (;;) {
1060                 __set_current_state(TASK_INTERRUPTIBLE);
1061                 if ((as = async_getcompleted(ps)))
1062                         break;
1063                 if (signal_pending(current))
1064                         break;
1065                 usb_unlock_device(dev);
1066                 schedule();
1067                 usb_lock_device(dev);
1068         }
1069         remove_wait_queue(&ps->wait, &wait);
1070         set_current_state(TASK_RUNNING);
1071         return as;
1072 }
1073
1074 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1075 {
1076         struct async *as = reap_as(ps);
1077         if (as)
1078                 return processcompl(as, (void __user * __user *)arg);
1079         if (signal_pending(current))
1080                 return -EINTR;
1081         return -EIO;
1082 }
1083
1084 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1085 {
1086         struct async *as;
1087
1088         if (!(as = async_getcompleted(ps)))
1089                 return -EAGAIN;
1090         return processcompl(as, (void __user * __user *)arg);
1091 }
1092
1093 #ifdef CONFIG_COMPAT
1094
1095 static int get_urb32(struct usbdevfs_urb *kurb,
1096                      struct usbdevfs_urb32 __user *uurb)
1097 {
1098         __u32  uptr;
1099         if (get_user(kurb->type, &uurb->type) ||
1100             __get_user(kurb->endpoint, &uurb->endpoint) ||
1101             __get_user(kurb->status, &uurb->status) ||
1102             __get_user(kurb->flags, &uurb->flags) ||
1103             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1104             __get_user(kurb->actual_length, &uurb->actual_length) ||
1105             __get_user(kurb->start_frame, &uurb->start_frame) ||
1106             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1107             __get_user(kurb->error_count, &uurb->error_count) ||
1108             __get_user(kurb->signr, &uurb->signr))
1109                 return -EFAULT;
1110
1111         if (__get_user(uptr, &uurb->buffer))
1112                 return -EFAULT;
1113         kurb->buffer = compat_ptr(uptr);
1114         if (__get_user(uptr, &uurb->buffer))
1115                 return -EFAULT;
1116         kurb->usercontext = compat_ptr(uptr);
1117
1118         return 0;
1119 }
1120
1121 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1122 {
1123         struct usbdevfs_urb uurb;
1124
1125         if (get_urb32(&uurb,(struct usbdevfs_urb32 *)arg))
1126                 return -EFAULT;
1127
1128         return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg);
1129 }
1130
1131 static int processcompl_compat(struct async *as, void __user * __user *arg)
1132 {
1133         struct urb *urb = as->urb;
1134         struct usbdevfs_urb32 __user *userurb = as->userurb;
1135         void __user *addr = as->userurb;
1136         unsigned int i;
1137
1138         if (as->userbuffer)
1139                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1140                         return -EFAULT;
1141         if (put_user(urb->status, &userurb->status))
1142                 return -EFAULT;
1143         if (put_user(urb->actual_length, &userurb->actual_length))
1144                 return -EFAULT;
1145         if (put_user(urb->error_count, &userurb->error_count))
1146                 return -EFAULT;
1147
1148         if (usb_pipeisoc(urb->pipe)) {
1149                 for (i = 0; i < urb->number_of_packets; i++) {
1150                         if (put_user(urb->iso_frame_desc[i].actual_length,
1151                                      &userurb->iso_frame_desc[i].actual_length))
1152                                 return -EFAULT;
1153                         if (put_user(urb->iso_frame_desc[i].status,
1154                                      &userurb->iso_frame_desc[i].status))
1155                                 return -EFAULT;
1156                 }
1157         }
1158
1159         free_async(as);
1160         if (put_user((u32)(u64)addr, (u32 __user *)arg))
1161                 return -EFAULT;
1162         return 0;
1163 }
1164
1165 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1166 {
1167         struct async *as = reap_as(ps);
1168         if (as)
1169                 return processcompl_compat(as, (void __user * __user *)arg);
1170         if (signal_pending(current))
1171                 return -EINTR;
1172         return -EIO;
1173 }
1174
1175 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1176 {
1177         struct async *as;
1178
1179         if (!(as = async_getcompleted(ps)))
1180                 return -EAGAIN;
1181         return processcompl_compat(as, (void __user * __user *)arg);
1182 }
1183
1184 #endif
1185
1186 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1187 {
1188         struct usbdevfs_disconnectsignal ds;
1189
1190         if (copy_from_user(&ds, arg, sizeof(ds)))
1191                 return -EFAULT;
1192         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1193                 return -EINVAL;
1194         ps->discsignr = ds.signr;
1195         ps->disccontext = ds.context;
1196         return 0;
1197 }
1198
1199 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1200 {
1201         unsigned int ifnum;
1202
1203         if (get_user(ifnum, (unsigned int __user *)arg))
1204                 return -EFAULT;
1205         return claimintf(ps, ifnum);
1206 }
1207
1208 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1209 {
1210         unsigned int ifnum;
1211         int ret;
1212
1213         if (get_user(ifnum, (unsigned int __user *)arg))
1214                 return -EFAULT;
1215         if ((ret = releaseintf(ps, ifnum)) < 0)
1216                 return ret;
1217         destroy_async_on_interface (ps, ifnum);
1218         return 0;
1219 }
1220
1221 static int proc_ioctl (struct dev_state *ps, void __user *arg)
1222 {
1223         struct usbdevfs_ioctl   ctrl;
1224         int                     size;
1225         void                    *buf = NULL;
1226         int                     retval = 0;
1227         struct usb_interface    *intf = NULL;
1228         struct usb_driver       *driver = NULL;
1229         int                     i;
1230
1231         /* get input parameters and alloc buffer */
1232         if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
1233                 return -EFAULT;
1234         if ((size = _IOC_SIZE (ctrl.ioctl_code)) > 0) {
1235                 if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
1236                         return -ENOMEM;
1237                 if ((_IOC_DIR(ctrl.ioctl_code) & _IOC_WRITE)) {
1238                         if (copy_from_user (buf, ctrl.data, size)) {
1239                                 kfree(buf);
1240                                 return -EFAULT;
1241                         }
1242                 } else {
1243                         memset (buf, 0, size);
1244                 }
1245         }
1246
1247         if (!connected(ps->dev)) {
1248                 kfree(buf);
1249                 return -ENODEV;
1250         }
1251
1252         if (ps->dev->state != USB_STATE_CONFIGURED)
1253                 retval = -EHOSTUNREACH;
1254         else if (!(intf = usb_ifnum_to_if (ps->dev, ctrl.ifno)))
1255                retval = -EINVAL;
1256         else switch (ctrl.ioctl_code) {
1257
1258         /* disconnect kernel driver from interface */
1259         case USBDEVFS_DISCONNECT:
1260
1261                 /* don't allow the user to unbind the hub driver from
1262                  * a hub with children to manage */
1263                 for (i = 0; i < ps->dev->maxchild; ++i) {
1264                         if (ps->dev->children[i])
1265                                 retval = -EBUSY;
1266                 }
1267                 if (retval)
1268                         break;
1269
1270                 down_write(&usb_bus_type.subsys.rwsem);
1271                 if (intf->dev.driver) {
1272                         driver = to_usb_driver(intf->dev.driver);
1273                         dev_dbg (&intf->dev, "disconnect by usbfs\n");
1274                         usb_driver_release_interface(driver, intf);
1275                 } else
1276                         retval = -ENODATA;
1277                 up_write(&usb_bus_type.subsys.rwsem);
1278                 break;
1279
1280         /* let kernel drivers try to (re)bind to the interface */
1281         case USBDEVFS_CONNECT:
1282                 usb_unlock_device(ps->dev);
1283                 usb_lock_all_devices();
1284                 bus_rescan_devices(intf->dev.bus);
1285                 usb_unlock_all_devices();
1286                 usb_lock_device(ps->dev);
1287                 break;
1288
1289         /* talk directly to the interface's driver */
1290         default:
1291                 down_read(&usb_bus_type.subsys.rwsem);
1292                 if (intf->dev.driver)
1293                         driver = to_usb_driver(intf->dev.driver);
1294                 if (driver == NULL || driver->ioctl == NULL) {
1295                         retval = -ENOTTY;
1296                 } else {
1297                         retval = driver->ioctl (intf, ctrl.ioctl_code, buf);
1298                         if (retval == -ENOIOCTLCMD)
1299                                 retval = -ENOTTY;
1300                 }
1301                 up_read(&usb_bus_type.subsys.rwsem);
1302         }
1303
1304         /* cleanup and return */
1305         if (retval >= 0
1306                         && (_IOC_DIR (ctrl.ioctl_code) & _IOC_READ) != 0
1307                         && size > 0
1308                         && copy_to_user (ctrl.data, buf, size) != 0)
1309                 retval = -EFAULT;
1310
1311         kfree(buf);
1312         return retval;
1313 }
1314
1315 /*
1316  * NOTE:  All requests here that have interface numbers as parameters
1317  * are assuming that somehow the configuration has been prevented from
1318  * changing.  But there's no mechanism to ensure that...
1319  */
1320 static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1321 {
1322         struct dev_state *ps = (struct dev_state *)file->private_data;
1323         struct usb_device *dev = ps->dev;
1324         void __user *p = (void __user *)arg;
1325         int ret = -ENOTTY;
1326
1327         if (!(file->f_mode & FMODE_WRITE))
1328                 return -EPERM;
1329         usb_lock_device(dev);
1330         if (!connected(dev)) {
1331                 usb_unlock_device(dev);
1332                 return -ENODEV;
1333         }
1334
1335         switch (cmd) {
1336         case USBDEVFS_CONTROL:
1337                 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
1338                 ret = proc_control(ps, p);
1339                 if (ret >= 0)
1340                         inode->i_mtime = CURRENT_TIME;
1341                 break;
1342
1343         case USBDEVFS_BULK:
1344                 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
1345                 ret = proc_bulk(ps, p);
1346                 if (ret >= 0)
1347                         inode->i_mtime = CURRENT_TIME;
1348                 break;
1349
1350         case USBDEVFS_RESETEP:
1351                 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
1352                 ret = proc_resetep(ps, p);
1353                 if (ret >= 0)
1354                         inode->i_mtime = CURRENT_TIME;
1355                 break;
1356
1357         case USBDEVFS_RESET:
1358                 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
1359                 ret = proc_resetdevice(ps);
1360                 break;
1361
1362         case USBDEVFS_CLEAR_HALT:
1363                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
1364                 ret = proc_clearhalt(ps, p);
1365                 if (ret >= 0)
1366                         inode->i_mtime = CURRENT_TIME;
1367                 break;
1368
1369         case USBDEVFS_GETDRIVER:
1370                 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
1371                 ret = proc_getdriver(ps, p);
1372                 break;
1373
1374         case USBDEVFS_CONNECTINFO:
1375                 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
1376                 ret = proc_connectinfo(ps, p);
1377                 break;
1378
1379         case USBDEVFS_SETINTERFACE:
1380                 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
1381                 ret = proc_setintf(ps, p);
1382                 break;
1383
1384         case USBDEVFS_SETCONFIGURATION:
1385                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
1386                 ret = proc_setconfig(ps, p);
1387                 break;
1388
1389         case USBDEVFS_SUBMITURB:
1390                 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
1391                 ret = proc_submiturb(ps, p);
1392                 if (ret >= 0)
1393                         inode->i_mtime = CURRENT_TIME;
1394                 break;
1395
1396 #ifdef CONFIG_COMPAT
1397
1398         case USBDEVFS_SUBMITURB32:
1399                 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
1400                 ret = proc_submiturb_compat(ps, p);
1401                 if (ret >= 0)
1402                         inode->i_mtime = CURRENT_TIME;
1403                 break;
1404
1405         case USBDEVFS_REAPURB32:
1406                 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
1407                 ret = proc_reapurb_compat(ps, p);
1408                 break;
1409
1410         case USBDEVFS_REAPURBNDELAY32:
1411                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
1412                 ret = proc_reapurbnonblock_compat(ps, p);
1413                 break;
1414
1415 #endif
1416
1417         case USBDEVFS_DISCARDURB:
1418                 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
1419                 ret = proc_unlinkurb(ps, p);
1420                 break;
1421
1422         case USBDEVFS_REAPURB:
1423                 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
1424                 ret = proc_reapurb(ps, p);
1425                 break;
1426
1427         case USBDEVFS_REAPURBNDELAY:
1428                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
1429                 ret = proc_reapurbnonblock(ps, p);
1430                 break;
1431
1432         case USBDEVFS_DISCSIGNAL:
1433                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
1434                 ret = proc_disconnectsignal(ps, p);
1435                 break;
1436
1437         case USBDEVFS_CLAIMINTERFACE:
1438                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
1439                 ret = proc_claiminterface(ps, p);
1440                 break;
1441
1442         case USBDEVFS_RELEASEINTERFACE:
1443                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
1444                 ret = proc_releaseinterface(ps, p);
1445                 break;
1446
1447         case USBDEVFS_IOCTL:
1448                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1449                 ret = proc_ioctl(ps, p);
1450                 break;
1451         }
1452         usb_unlock_device(dev);
1453         if (ret >= 0)
1454                 inode->i_atime = CURRENT_TIME;
1455         return ret;
1456 }
1457
1458 /* No kernel lock - fine */
1459 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
1460 {
1461         struct dev_state *ps = (struct dev_state *)file->private_data;
1462         unsigned int mask = 0;
1463
1464         poll_wait(file, &ps->wait, wait);
1465         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1466                 mask |= POLLOUT | POLLWRNORM;
1467         if (!connected(ps->dev))
1468                 mask |= POLLERR | POLLHUP;
1469         return mask;
1470 }
1471
1472 struct file_operations usbfs_device_file_operations = {
1473         .llseek =       usbdev_lseek,
1474         .read =         usbdev_read,
1475         .poll =         usbdev_poll,
1476         .ioctl =        usbdev_ioctl,
1477         .open =         usbdev_open,
1478         .release =      usbdev_release,
1479 };