drivers/usb/core/devio.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *      devio.c  --  User space communication with USB devices.
   5  *
   6  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   7  *
   8  *      This program is free software; you can redistribute it and/or modify
   9  *      it under the terms of the GNU General Public License as published by
  10  *      the Free Software Foundation; either version 2 of the License, or
  11  *      (at your option) any later version.
  12  *
  13  *      This program is distributed in the hope that it will be useful,
  14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *      GNU General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License
  19  *      along with this program; if not, write to the Free Software
  20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  *  $Id: devio.c,v 1.7 2000/02/01 17:28:48 fliegl Exp $
  23  *
  24  *  This file implements the usbfs/x/y files, where
  25  *  x is the bus number and y the device number.
  26  *
  27  *  It allows user space programs/"drivers" to communicate directly
  28  *  with USB devices without intervening kernel driver.
  29  *
  30  *  Revision history
  31  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  32  *    04.01.2000   0.2   Turned into its own filesystem
  33  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  34  *                       (CAN-2005-3055)
  35  */
  36
  37 /*****************************************************************************/
  38
  39 #include <linux/fs.h>
  40 #include <linux/mm.h>
  41 #include <linux/slab.h>
  42 #include <linux/smp_lock.h>
  43 #include <linux/signal.h>
  44 #include <linux/poll.h>
  45 #include <linux/module.h>
  46 #include <linux/usb.h>
  47 #include <linux/usbdevice_fs.h>
  48 #include <linux/cdev.h>
  49 #include <asm/uaccess.h>
  50 #include <asm/byteorder.h>
  51 #include <linux/moduleparam.h>
  52
  53 #include "hcd.h"        /* for usbcore internals */
  54 #include "usb.h"
  55
  56 #define USB_MAXBUS                      64
  57 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
  58 static struct class *usb_device_class;
  59
  60 struct async {
  61         struct list_head asynclist;
  62         struct dev_state *ps;
  63         pid_t pid;
  64         uid_t uid, euid;
  65         unsigned int signr;
  66         unsigned int ifnum;
  67         void __user *userbuffer;
  68         void __user *userurb;
  69         struct urb *urb;
  70 };
  71
  72 static int usbfs_snoop = 0;
  73 module_param (usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  74 MODULE_PARM_DESC (usbfs_snoop, "true to log all usbfs traffic");
  75
  76 #define snoop(dev, format, arg...)                              \
  77         do {                                                    \
  78                 if (usbfs_snoop)                                \
  79                         dev_info( dev , format , ## arg);       \
  80         } while (0)
  81
  82 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
  83
  84
  85 #define MAX_USBFS_BUFFER_SIZE   16384
  86
  87 static inline int connected (struct usb_device *dev)
  88 {
  89         return dev->state != USB_STATE_NOTATTACHED;
  90 }
  91
  92 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
  93 {
  94         loff_t ret;
  95
  96         lock_kernel();
  97
  98         switch (orig) {
  99         case 0:
 100                 file->f_pos = offset;
 101                 ret = file->f_pos;
 102                 break;
 103         case 1:
 104                 file->f_pos += offset;
 105                 ret = file->f_pos;
 106                 break;
 107         case 2:
 108         default:
 109                 ret = -EINVAL;
 110         }
 111
 112         unlock_kernel();
 113         return ret;
 114 }
 115
 116 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
 117 {
 118         struct dev_state *ps = (struct dev_state *)file->private_data;
 119         struct usb_device *dev = ps->dev;
 120         ssize_t ret = 0;
 121         unsigned len;
 122         loff_t pos;
 123         int i;
 124
 125         pos = *ppos;
 126         usb_lock_device(dev);
 127         if (!connected(dev)) {
 128                 ret = -ENODEV;
 129                 goto err;
 130         } else if (pos < 0) {
 131                 ret = -EINVAL;
 132                 goto err;
 133         }
 134
 135         if (pos < sizeof(struct usb_device_descriptor)) {
 136                 struct usb_device_descriptor *desc = kmalloc(sizeof(*desc), GFP_KERNEL);
 137                 if (!desc) {
 138                         ret = -ENOMEM;
 139                         goto err;
 140                 }
 141                 memcpy(desc, &dev->descriptor, sizeof(dev->descriptor));
 142                 le16_to_cpus(&desc->bcdUSB);
 143                 le16_to_cpus(&desc->idVendor);
 144                 le16_to_cpus(&desc->idProduct);
 145                 le16_to_cpus(&desc->bcdDevice);
 146
 147                 len = sizeof(struct usb_device_descriptor) - pos;
 148                 if (len > nbytes)
 149                         len = nbytes;
 150                 if (copy_to_user(buf, ((char *)desc) + pos, len)) {
 151                         kfree(desc);
 152                         ret = -EFAULT;
 153                         goto err;
 154                 }
 155                 kfree(desc);
 156
 157                 *ppos += len;
 158                 buf += len;
 159                 nbytes -= len;
 160                 ret += len;
 161         }
 162
 163         pos = sizeof(struct usb_device_descriptor);
 164         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 165                 struct usb_config_descriptor *config =
 166                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 167                 unsigned int length = le16_to_cpu(config->wTotalLength);
 168
 169                 if (*ppos < pos + length) {
 170
 171                         /* The descriptor may claim to be longer than it
 172                          * really is.  Here is the actual allocated length. */
 173                         unsigned alloclen =
 174                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 175
 176                         len = length - (*ppos - pos);
 177                         if (len > nbytes)
 178                                 len = nbytes;
 179
 180                         /* Simply don't write (skip over) unallocated parts */
 181                         if (alloclen > (*ppos - pos)) {
 182                                 alloclen -= (*ppos - pos);
 183                                 if (copy_to_user(buf,
 184                                     dev->rawdescriptors[i] + (*ppos - pos),
 185                                     min(len, alloclen))) {
 186                                         ret = -EFAULT;
 187                                         goto err;
 188                                 }
 189                         }
 190
 191                         *ppos += len;
 192                         buf += len;
 193                         nbytes -= len;
 194                         ret += len;
 195                 }
 196
 197                 pos += length;
 198         }
 199
 200 err:
 201         usb_unlock_device(dev);
 202         return ret;
 203 }
 204
 205 /*
 206  * async list handling
 207  */
 208
 209 static struct async *alloc_async(unsigned int numisoframes)
 210 {
 211         unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor);
 212         struct async *as = kmalloc(assize, GFP_KERNEL);
 213         if (!as)
 214                 return NULL;
 215         memset(as, 0, assize);
 216         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 217         if (!as->urb) {
 218                 kfree(as);
 219                 return NULL;
 220         }
 221         return as;
 222 }
 223
 224 static void free_async(struct async *as)
 225 {
 226         kfree(as->urb->transfer_buffer);
 227         kfree(as->urb->setup_packet);
 228         usb_free_urb(as->urb);
 229         kfree(as);
 230 }
 231
 232 static inline void async_newpending(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_add_tail(&as->asynclist, &ps->async_pending);
 239         spin_unlock_irqrestore(&ps->lock, flags);
 240 }
 241
 242 static inline void async_removepending(struct async *as)
 243 {
 244         struct dev_state *ps = as->ps;
 245         unsigned long flags;
 246
 247         spin_lock_irqsave(&ps->lock, flags);
 248         list_del_init(&as->asynclist);
 249         spin_unlock_irqrestore(&ps->lock, flags);
 250 }
 251
 252 static inline struct async *async_getcompleted(struct dev_state *ps)
 253 {
 254         unsigned long flags;
 255         struct async *as = NULL;
 256
 257         spin_lock_irqsave(&ps->lock, flags);
 258         if (!list_empty(&ps->async_completed)) {
 259                 as = list_entry(ps->async_completed.next, struct async, asynclist);
 260                 list_del_init(&as->asynclist);
 261         }
 262         spin_unlock_irqrestore(&ps->lock, flags);
 263         return as;
 264 }
 265
 266 static inline struct async *async_getpending(struct dev_state *ps, void __user *userurb)
 267 {
 268         unsigned long flags;
 269         struct async *as;
 270
 271         spin_lock_irqsave(&ps->lock, flags);
 272         list_for_each_entry(as, &ps->async_pending, asynclist)
 273                 if (as->userurb == userurb) {
 274                         list_del_init(&as->asynclist);
 275                         spin_unlock_irqrestore(&ps->lock, flags);
 276                         return as;
 277                 }
 278         spin_unlock_irqrestore(&ps->lock, flags);
 279         return NULL;
 280 }
 281
 282 static void async_completed(struct urb *urb, struct pt_regs *regs)
 283 {
 284         struct async *as = (struct async *)urb->context;
 285         struct dev_state *ps = as->ps;
 286         struct siginfo sinfo;
 287
 288         spin_lock(&ps->lock);
 289         list_move_tail(&as->asynclist, &ps->async_completed);
 290         spin_unlock(&ps->lock);
 291         if (as->signr) {
 292                 sinfo.si_signo = as->signr;
 293                 sinfo.si_errno = as->urb->status;
 294                 sinfo.si_code = SI_ASYNCIO;
 295                 sinfo.si_addr = as->userurb;
 296                 kill_proc_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
 297                                       as->euid);
 298         }
 299         wake_up(&ps->wait);
 300 }
 301
 302 static void destroy_async (struct dev_state *ps, struct list_head *list)
 303 {
 304         struct async *as;
 305         unsigned long flags;
 306
 307         spin_lock_irqsave(&ps->lock, flags);
 308         while (!list_empty(list)) {
 309                 as = list_entry(list->next, struct async, asynclist);
 310                 list_del_init(&as->asynclist);
 311
 312                 /* drop the spinlock so the completion handler can run */
 313                 spin_unlock_irqrestore(&ps->lock, flags);
 314                 usb_kill_urb(as->urb);
 315                 spin_lock_irqsave(&ps->lock, flags);
 316         }
 317         spin_unlock_irqrestore(&ps->lock, flags);
 318         as = async_getcompleted(ps);
 319         while (as) {
 320                 free_async(as);
 321                 as = async_getcompleted(ps);
 322         }
 323 }
 324
 325 static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum)
 326 {
 327         struct list_head *p, *q, hitlist;
 328         unsigned long flags;
 329
 330         INIT_LIST_HEAD(&hitlist);
 331         spin_lock_irqsave(&ps->lock, flags);
 332         list_for_each_safe(p, q, &ps->async_pending)
 333                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 334                         list_move_tail(p, &hitlist);
 335         spin_unlock_irqrestore(&ps->lock, flags);
 336         destroy_async(ps, &hitlist);
 337 }
 338
 339 static inline void destroy_all_async(struct dev_state *ps)
 340 {
 341                 destroy_async(ps, &ps->async_pending);
 342 }
 343
 344 /*
 345  * interface claims are made only at the request of user level code,
 346  * which can also release them (explicitly or by closing files).
 347  * they're also undone when devices disconnect.
 348  */
 349
 350 static int driver_probe (struct usb_interface *intf,
 351                          const struct usb_device_id *id)
 352 {
 353         return -ENODEV;
 354 }
 355
 356 static void driver_disconnect(struct usb_interface *intf)
 357 {
 358         struct dev_state *ps = usb_get_intfdata (intf);
 359         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 360
 361         if (!ps)
 362                 return;
 363
 364         /* NOTE:  this relies on usbcore having canceled and completed
 365          * all pending I/O requests; 2.6 does that.
 366          */
 367
 368         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 369                 clear_bit(ifnum, &ps->ifclaimed);
 370         else
 371                 warn("interface number %u out of range", ifnum);
 372
 373         usb_set_intfdata (intf, NULL);
 374
 375         /* force async requests to complete */
 376         destroy_async_on_interface(ps, ifnum);
 377 }
 378
 379 struct usb_driver usbfs_driver = {
 380         .owner =        THIS_MODULE,
 381         .name =         "usbfs",
 382         .probe =        driver_probe,
 383         .disconnect =   driver_disconnect,
 384 };
 385
 386 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 387 {
 388         struct usb_device *dev = ps->dev;
 389         struct usb_interface *intf;
 390         int err;
 391
 392         if (ifnum >= 8*sizeof(ps->ifclaimed))
 393                 return -EINVAL;
 394         /* already claimed */
 395         if (test_bit(ifnum, &ps->ifclaimed))
 396                 return 0;
 397
 398         /* lock against other changes to driver bindings */
 399         down_write(&usb_bus_type.subsys.rwsem);
 400         intf = usb_ifnum_to_if(dev, ifnum);
 401         if (!intf)
 402                 err = -ENOENT;
 403         else
 404                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 405         up_write(&usb_bus_type.subsys.rwsem);
 406         if (err == 0)
 407                 set_bit(ifnum, &ps->ifclaimed);
 408         return err;
 409 }
 410
 411 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 412 {
 413         struct usb_device *dev;
 414         struct usb_interface *intf;
 415         int err;
 416
 417         err = -EINVAL;
 418         if (ifnum >= 8*sizeof(ps->ifclaimed))
 419                 return err;
 420         dev = ps->dev;
 421         /* lock against other changes to driver bindings */
 422         down_write(&usb_bus_type.subsys.rwsem);
 423         intf = usb_ifnum_to_if(dev, ifnum);
 424         if (!intf)
 425                 err = -ENOENT;
 426         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 427                 usb_driver_release_interface(&usbfs_driver, intf);
 428                 err = 0;
 429         }
 430         up_write(&usb_bus_type.subsys.rwsem);
 431         return err;
 432 }
 433
 434 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 435 {
 436         if (ps->dev->state != USB_STATE_CONFIGURED)
 437                 return -EHOSTUNREACH;
 438         if (ifnum >= 8*sizeof(ps->ifclaimed))
 439                 return -EINVAL;
 440         if (test_bit(ifnum, &ps->ifclaimed))
 441                 return 0;
 442         /* if not yet claimed, claim it for the driver */
 443         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n",
 444                current->pid, current->comm, ifnum);
 445         return claimintf(ps, ifnum);
 446 }
 447
 448 static int findintfep(struct usb_device *dev, unsigned int ep)
 449 {
 450         unsigned int i, j, e;
 451         struct usb_interface *intf;
 452         struct usb_host_interface *alts;
 453         struct usb_endpoint_descriptor *endpt;
 454
 455         if (ep & ~(USB_DIR_IN|0xf))
 456                 return -EINVAL;
 457         if (!dev->actconfig)
 458                 return -ESRCH;
 459         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 460                 intf = dev->actconfig->interface[i];
 461                 for (j = 0; j < intf->num_altsetting; j++) {
 462                         alts = &intf->altsetting[j];
 463                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 464                                 endpt = &alts->endpoint[e].desc;
 465                                 if (endpt->bEndpointAddress == ep)
 466                                         return alts->desc.bInterfaceNumber;
 467                         }
 468                 }
 469         }
 470         return -ENOENT;
 471 }
 472
 473 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
 474 {
 475         int ret = 0;
 476
 477         if (ps->dev->state != USB_STATE_CONFIGURED)
 478                 return -EHOSTUNREACH;
 479         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 480                 return 0;
 481
 482         index &= 0xff;
 483         switch (requesttype & USB_RECIP_MASK) {
 484         case USB_RECIP_ENDPOINT:
 485                 if ((ret = findintfep(ps->dev, index)) >= 0)
 486                         ret = checkintf(ps, ret);
 487                 break;
 488
 489         case USB_RECIP_INTERFACE:
 490                 ret = checkintf(ps, index);
 491                 break;
 492         }
 493         return ret;
 494 }
 495
 496 /*
 497  * file operations
 498  */
 499 static int usbdev_open(struct inode *inode, struct file *file)
 500 {
 501         struct usb_device *dev = NULL;
 502         struct dev_state *ps;
 503         int ret;
 504
 505         /*
 506          * no locking necessary here, as chrdev_open has the kernel lock
 507          * (still acquire the kernel lock for safety)
 508          */
 509         ret = -ENOMEM;
 510         if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
 511                 goto out_nolock;
 512
 513         lock_kernel();
 514         ret = -ENOENT;
 515         /* check if we are called from a real node or usbfs */
 516         if (imajor(inode) == USB_DEVICE_MAJOR)
 517                 dev = usbdev_lookup_minor(iminor(inode));
 518         if (!dev)
 519                 dev = inode->u.generic_ip;
 520         if (!dev) {
 521                 kfree(ps);
 522                 goto out;
 523         }
 524         usb_get_dev(dev);
 525         ret = 0;
 526         ps->dev = dev;
 527         ps->file = file;
 528         spin_lock_init(&ps->lock);
 529         INIT_LIST_HEAD(&ps->async_pending);
 530         INIT_LIST_HEAD(&ps->async_completed);
 531         init_waitqueue_head(&ps->wait);
 532         ps->discsignr = 0;
 533         ps->disc_pid = current->pid;
 534         ps->disc_uid = current->uid;
 535         ps->disc_euid = current->euid;
 536         ps->disccontext = NULL;
 537         ps->ifclaimed = 0;
 538         wmb();
 539         list_add_tail(&ps->list, &dev->filelist);
 540         file->private_data = ps;
 541  out:
 542         unlock_kernel();
 543  out_nolock:
 544         return ret;
 545 }
 546
 547 static int usbdev_release(struct inode *inode, struct file *file)
 548 {
 549         struct dev_state *ps = (struct dev_state *)file->private_data;
 550         struct usb_device *dev = ps->dev;
 551         unsigned int ifnum;
 552
 553         usb_lock_device(dev);
 554         list_del_init(&ps->list);
 555         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 556                         ifnum++) {
 557                 if (test_bit(ifnum, &ps->ifclaimed))
 558                         releaseintf(ps, ifnum);
 559         }
 560         destroy_all_async(ps);
 561         usb_unlock_device(dev);
 562         usb_put_dev(dev);
 563         ps->dev = NULL;
 564         kfree(ps);
 565         return 0;
 566 }
 567
 568 static int proc_control(struct dev_state *ps, void __user *arg)
 569 {
 570         struct usb_device *dev = ps->dev;
 571         struct usbdevfs_ctrltransfer ctrl;
 572         unsigned int tmo;
 573         unsigned char *tbuf;
 574         int i, j, ret;
 575
 576         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 577                 return -EFAULT;
 578         if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
 579                 return ret;
 580         if (ctrl.wLength > PAGE_SIZE)
 581                 return -EINVAL;
 582         if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
 583                 return -ENOMEM;
 584         tmo = ctrl.timeout;
 585         if (ctrl.bRequestType & 0x80) {
 586                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
 587                         free_page((unsigned long)tbuf);
 588                         return -EINVAL;
 589                 }
 590                 snoop(&dev->dev, "control read: bRequest=%02x "
 591                                 "bRrequestType=%02x wValue=%04x "
 592                                 "wIndex=%04x wLength=%04x\n",
 593                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 594                                 ctrl.wIndex, ctrl.wLength);
 595
 596                 usb_unlock_device(dev);
 597                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 598                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 599                 usb_lock_device(dev);
 600                 if ((i > 0) && ctrl.wLength) {
 601                         if (usbfs_snoop) {
 602                                 dev_info(&dev->dev, "control read: data ");
 603                                 for (j = 0; j < i; ++j)
 604                                         printk ("%02x ", (unsigned char)(tbuf)[j]);
 605                                 printk("\n");
 606                         }
 607                         if (copy_to_user(ctrl.data, tbuf, i)) {
 608                                 free_page((unsigned long)tbuf);
 609                                 return -EFAULT;
 610                         }
 611                 }
 612         } else {
 613                 if (ctrl.wLength) {
 614                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 615                                 free_page((unsigned long)tbuf);
 616                                 return -EFAULT;
 617                         }
 618                 }
 619                 snoop(&dev->dev, "control write: bRequest=%02x "
 620                                 "bRrequestType=%02x wValue=%04x "
 621                                 "wIndex=%04x wLength=%04x\n",
 622                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 623                                 ctrl.wIndex, ctrl.wLength);
 624                 if (usbfs_snoop) {
 625                         dev_info(&dev->dev, "control write: data: ");
 626                         for (j = 0; j < ctrl.wLength; ++j)
 627                                 printk ("%02x ", (unsigned char)(tbuf)[j]);
 628                         printk("\n");
 629                 }
 630                 usb_unlock_device(dev);
 631                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 632                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 633                 usb_lock_device(dev);
 634         }
 635         free_page((unsigned long)tbuf);
 636         if (i<0 && i != -EPIPE) {
 637                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 638                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 639                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 640                            ctrl.wLength, i);
 641         }
 642         return i;
 643 }
 644
 645 static int proc_bulk(struct dev_state *ps, void __user *arg)
 646 {
 647         struct usb_device *dev = ps->dev;
 648         struct usbdevfs_bulktransfer bulk;
 649         unsigned int tmo, len1, pipe;
 650         int len2;
 651         unsigned char *tbuf;
 652         int i, ret;
 653
 654         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 655                 return -EFAULT;
 656         if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
 657                 return ret;
 658         if ((ret = checkintf(ps, ret)))
 659                 return ret;
 660         if (bulk.ep & USB_DIR_IN)
 661                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 662         else
 663                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 664         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 665                 return -EINVAL;
 666         len1 = bulk.len;
 667         if (len1 > MAX_USBFS_BUFFER_SIZE)
 668                 return -EINVAL;
 669         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 670                 return -ENOMEM;
 671         tmo = bulk.timeout;
 672         if (bulk.ep & 0x80) {
 673                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 674                         kfree(tbuf);
 675                         return -EINVAL;
 676                 }
 677                 usb_unlock_device(dev);
 678                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 679                 usb_lock_device(dev);
 680                 if (!i && len2) {
 681                         if (copy_to_user(bulk.data, tbuf, len2)) {
 682                                 kfree(tbuf);
 683                                 return -EFAULT;
 684                         }
 685                 }
 686         } else {
 687                 if (len1) {
 688                         if (copy_from_user(tbuf, bulk.data, len1)) {
 689                                 kfree(tbuf);
 690                                 return -EFAULT;
 691                         }
 692                 }
 693                 usb_unlock_device(dev);
 694                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 695                 usb_lock_device(dev);
 696         }
 697         kfree(tbuf);
 698         if (i < 0)
 699                 return i;
 700         return len2;
 701 }
 702
 703 static int proc_resetep(struct dev_state *ps, void __user *arg)
 704 {
 705         unsigned int ep;
 706         int ret;
 707
 708         if (get_user(ep, (unsigned int __user *)arg))
 709                 return -EFAULT;
 710         if ((ret = findintfep(ps->dev, ep)) < 0)
 711                 return ret;
 712         if ((ret = checkintf(ps, ret)))
 713                 return ret;
 714         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
 715         return 0;
 716 }
 717
 718 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 719 {
 720         unsigned int ep;
 721         int pipe;
 722         int ret;
 723
 724         if (get_user(ep, (unsigned int __user *)arg))
 725                 return -EFAULT;
 726         if ((ret = findintfep(ps->dev, ep)) < 0)
 727                 return ret;
 728         if ((ret = checkintf(ps, ret)))
 729                 return ret;
 730         if (ep & USB_DIR_IN)
 731                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 732         else
 733                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 734
 735         return usb_clear_halt(ps->dev, pipe);
 736 }
 737
 738
 739 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 740 {
 741         struct usbdevfs_getdriver gd;
 742         struct usb_interface *intf;
 743         int ret;
 744
 745         if (copy_from_user(&gd, arg, sizeof(gd)))
 746                 return -EFAULT;
 747         down_read(&usb_bus_type.subsys.rwsem);
 748         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 749         if (!intf || !intf->dev.driver)
 750                 ret = -ENODATA;
 751         else {
 752                 strncpy(gd.driver, intf->dev.driver->name,
 753                                 sizeof(gd.driver));
 754                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 755         }
 756         up_read(&usb_bus_type.subsys.rwsem);
 757         return ret;
 758 }
 759
 760 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 761 {
 762         struct usbdevfs_connectinfo ci;
 763
 764         ci.devnum = ps->dev->devnum;
 765         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 766         if (copy_to_user(arg, &ci, sizeof(ci)))
 767                 return -EFAULT;
 768         return 0;
 769 }
 770
 771 static int proc_resetdevice(struct dev_state *ps)
 772 {
 773         return usb_reset_device(ps->dev);
 774
 775 }
 776
 777 static int proc_setintf(struct dev_state *ps, void __user *arg)
 778 {
 779         struct usbdevfs_setinterface setintf;
 780         int ret;
 781
 782         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 783                 return -EFAULT;
 784         if ((ret = checkintf(ps, setintf.interface)))
 785                 return ret;
 786         return usb_set_interface(ps->dev, setintf.interface,
 787                         setintf.altsetting);
 788 }
 789
 790 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 791 {
 792         unsigned int u;
 793         int status = 0;
 794         struct usb_host_config *actconfig;
 795
 796         if (get_user(u, (unsigned int __user *)arg))
 797                 return -EFAULT;
 798
 799         actconfig = ps->dev->actconfig;
 800
 801         /* Don't touch the device if any interfaces are claimed.
 802          * It could interfere with other drivers' operations, and if
 803          * an interface is claimed by usbfs it could easily deadlock.
 804          */
 805         if (actconfig) {
 806                 int i;
 807
 808                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 809                         if (usb_interface_claimed(actconfig->interface[i])) {
 810                                 dev_warn (&ps->dev->dev,
 811                                         "usbfs: interface %d claimed by %s "
 812                                         "while '%s' sets config #%d\n",
 813                                         actconfig->interface[i]
 814                                                 ->cur_altsetting
 815                                                 ->desc.bInterfaceNumber,
 816                                         actconfig->interface[i]
 817                                                 ->dev.driver->name,
 818                                         current->comm, u);
 819                                 status = -EBUSY;
 820                                 break;
 821                         }
 822                 }
 823         }
 824
 825         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 826          * so avoid usb_set_configuration()'s kick to sysfs
 827          */
 828         if (status == 0) {
 829                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 830                         status = usb_reset_configuration(ps->dev);
 831                 else
 832                         status = usb_set_configuration(ps->dev, u);
 833         }
 834
 835         return status;
 836 }
 837
 838
 839 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 840                              struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
 841                              void __user *arg)
 842 {
 843         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 844         struct usb_host_endpoint *ep;
 845         struct async *as;
 846         struct usb_ctrlrequest *dr = NULL;
 847         unsigned int u, totlen, isofrmlen;
 848         int ret, interval = 0, ifnum = -1;
 849
 850         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
 851                            URB_NO_FSBR|URB_ZERO_PACKET))
 852                 return -EINVAL;
 853         if (!uurb->buffer)
 854                 return -EINVAL;
 855         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
 856                 return -EINVAL;
 857         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
 858                 if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
 859                         return ifnum;
 860                 if ((ret = checkintf(ps, ifnum)))
 861                         return ret;
 862         }
 863         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0)
 864                 ep = ps->dev->ep_in [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 865         else
 866                 ep = ps->dev->ep_out [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 867         if (!ep)
 868                 return -ENOENT;
 869         switch(uurb->type) {
 870         case USBDEVFS_URB_TYPE_CONTROL:
 871                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 872                                 != USB_ENDPOINT_XFER_CONTROL)
 873                         return -EINVAL;
 874                 /* min 8 byte setup packet, max arbitrary */
 875                 if (uurb->buffer_length < 8 || uurb->buffer_length > PAGE_SIZE)
 876                         return -EINVAL;
 877                 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
 878                         return -ENOMEM;
 879                 if (copy_from_user(dr, uurb->buffer, 8)) {
 880                         kfree(dr);
 881                         return -EFAULT;
 882                 }
 883                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
 884                         kfree(dr);
 885                         return -EINVAL;
 886                 }
 887                 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
 888                         kfree(dr);
 889                         return ret;
 890                 }
 891                 uurb->endpoint = (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK);
 892                 uurb->number_of_packets = 0;
 893                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
 894                 uurb->buffer += 8;
 895                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ?  VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) {
 896                         kfree(dr);
 897                         return -EFAULT;
 898                 }
 899                 break;
 900
 901         case USBDEVFS_URB_TYPE_BULK:
 902                 switch (ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 903                 case USB_ENDPOINT_XFER_CONTROL:
 904                 case USB_ENDPOINT_XFER_ISOC:
 905                         return -EINVAL;
 906                 /* allow single-shot interrupt transfers, at bogus rates */
 907                 }
 908                 uurb->number_of_packets = 0;
 909                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
 910                         return -EINVAL;
 911                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
 912                         return -EFAULT;
 913                 break;
 914
 915         case USBDEVFS_URB_TYPE_ISO:
 916                 /* arbitrary limit */
 917                 if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
 918                         return -EINVAL;
 919                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 920                                 != USB_ENDPOINT_XFER_ISOC)
 921                         return -EINVAL;
 922                 interval = 1 << min (15, ep->desc.bInterval - 1);
 923                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
 924                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
 925                         return -ENOMEM;
 926                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
 927                         kfree(isopkt);
 928                         return -EFAULT;
 929                 }
 930                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
 931                         if (isopkt[u].length > 1023) {
 932                                 kfree(isopkt);
 933                                 return -EINVAL;
 934                         }
 935                         totlen += isopkt[u].length;
 936                 }
 937                 if (totlen > 32768) {
 938                         kfree(isopkt);
 939                         return -EINVAL;
 940                 }
 941                 uurb->buffer_length = totlen;
 942                 break;
 943
 944         case USBDEVFS_URB_TYPE_INTERRUPT:
 945                 uurb->number_of_packets = 0;
 946                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 947                                 != USB_ENDPOINT_XFER_INT)
 948                         return -EINVAL;
 949                 if (ps->dev->speed == USB_SPEED_HIGH)
 950                         interval = 1 << min (15, ep->desc.bInterval - 1);
 951                 else
 952                         interval = ep->desc.bInterval;
 953                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
 954                         return -EINVAL;
 955                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
 956                         return -EFAULT;
 957                 break;
 958
 959         default:
 960                 return -EINVAL;
 961         }
 962         if (!(as = alloc_async(uurb->number_of_packets))) {
 963                 kfree(isopkt);
 964                 kfree(dr);
 965                 return -ENOMEM;
 966         }
 967         if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
 968                 kfree(isopkt);
 969                 kfree(dr);
 970                 free_async(as);
 971                 return -ENOMEM;
 972         }
 973         as->urb->dev = ps->dev;
 974         as->urb->pipe = (uurb->type << 30) | __create_pipe(ps->dev, uurb->endpoint & 0xf) | (uurb->endpoint & USB_DIR_IN);
 975         as->urb->transfer_flags = uurb->flags;
 976         as->urb->transfer_buffer_length = uurb->buffer_length;
 977         as->urb->setup_packet = (unsigned char*)dr;
 978         as->urb->start_frame = uurb->start_frame;
 979         as->urb->number_of_packets = uurb->number_of_packets;
 980         as->urb->interval = interval;
 981         as->urb->context = as;
 982         as->urb->complete = async_completed;
 983         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
 984                 as->urb->iso_frame_desc[u].offset = totlen;
 985                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
 986                 totlen += isopkt[u].length;
 987         }
 988         kfree(isopkt);
 989         as->ps = ps;
 990         as->userurb = arg;
 991         if (uurb->endpoint & USB_DIR_IN)
 992                 as->userbuffer = uurb->buffer;
 993         else
 994                 as->userbuffer = NULL;
 995         as->signr = uurb->signr;
 996         as->ifnum = ifnum;
 997         as->pid = current->pid;
 998         as->uid = current->uid;
 999         as->euid = current->euid;
1000         if (!(uurb->endpoint & USB_DIR_IN)) {
1001                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, as->urb->transfer_buffer_length)) {
1002                         free_async(as);
1003                         return -EFAULT;
1004                 }
1005         }
1006         async_newpending(as);
1007         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1008                 dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
1009                 async_removepending(as);
1010                 free_async(as);
1011                 return ret;
1012         }
1013         return 0;
1014 }
1015
1016 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1017 {
1018         struct usbdevfs_urb uurb;
1019
1020         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1021                 return -EFAULT;
1022
1023         return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg);
1024 }
1025
1026 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1027 {
1028         struct async *as;
1029
1030         as = async_getpending(ps, arg);
1031         if (!as)
1032                 return -EINVAL;
1033         usb_kill_urb(as->urb);
1034         return 0;
1035 }
1036
1037 static int processcompl(struct async *as, void __user * __user *arg)
1038 {
1039         struct urb *urb = as->urb;
1040         struct usbdevfs_urb __user *userurb = as->userurb;
1041         void __user *addr = as->userurb;
1042         unsigned int i;
1043
1044         if (as->userbuffer)
1045                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1046                         return -EFAULT;
1047         if (put_user(urb->status, &userurb->status))
1048                 return -EFAULT;
1049         if (put_user(urb->actual_length, &userurb->actual_length))
1050                 return -EFAULT;
1051         if (put_user(urb->error_count, &userurb->error_count))
1052                 return -EFAULT;
1053
1054         if (usb_pipeisoc(urb->pipe)) {
1055                 for (i = 0; i < urb->number_of_packets; i++) {
1056                         if (put_user(urb->iso_frame_desc[i].actual_length,
1057                                      &userurb->iso_frame_desc[i].actual_length))
1058                                 return -EFAULT;
1059                         if (put_user(urb->iso_frame_desc[i].status,
1060                                      &userurb->iso_frame_desc[i].status))
1061                                 return -EFAULT;
1062                 }
1063         }
1064
1065         free_async(as);
1066
1067         if (put_user(addr, (void __user * __user *)arg))
1068                 return -EFAULT;
1069         return 0;
1070 }
1071
1072 static struct async* reap_as(struct dev_state *ps)
1073 {
1074         DECLARE_WAITQUEUE(wait, current);
1075         struct async *as = NULL;
1076         struct usb_device *dev = ps->dev;
1077
1078         add_wait_queue(&ps->wait, &wait);
1079         for (;;) {
1080                 __set_current_state(TASK_INTERRUPTIBLE);
1081                 if ((as = async_getcompleted(ps)))
1082                         break;
1083                 if (signal_pending(current))
1084                         break;
1085                 usb_unlock_device(dev);
1086                 schedule();
1087                 usb_lock_device(dev);
1088         }
1089         remove_wait_queue(&ps->wait, &wait);
1090         set_current_state(TASK_RUNNING);
1091         return as;
1092 }
1093
1094 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1095 {
1096         struct async *as = reap_as(ps);
1097         if (as)
1098                 return processcompl(as, (void __user * __user *)arg);
1099         if (signal_pending(current))
1100                 return -EINTR;
1101         return -EIO;
1102 }
1103
1104 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1105 {
1106         struct async *as;
1107
1108         if (!(as = async_getcompleted(ps)))
1109                 return -EAGAIN;
1110         return processcompl(as, (void __user * __user *)arg);
1111 }
1112
1113 #ifdef CONFIG_COMPAT
1114
1115 static int get_urb32(struct usbdevfs_urb *kurb,
1116                      struct usbdevfs_urb32 __user *uurb)
1117 {
1118         __u32  uptr;
1119         if (get_user(kurb->type, &uurb->type) ||
1120             __get_user(kurb->endpoint, &uurb->endpoint) ||
1121             __get_user(kurb->status, &uurb->status) ||
1122             __get_user(kurb->flags, &uurb->flags) ||
1123             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1124             __get_user(kurb->actual_length, &uurb->actual_length) ||
1125             __get_user(kurb->start_frame, &uurb->start_frame) ||
1126             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1127             __get_user(kurb->error_count, &uurb->error_count) ||
1128             __get_user(kurb->signr, &uurb->signr))
1129                 return -EFAULT;
1130
1131         if (__get_user(uptr, &uurb->buffer))
1132                 return -EFAULT;
1133         kurb->buffer = compat_ptr(uptr);
1134         if (__get_user(uptr, &uurb->buffer))
1135                 return -EFAULT;
1136         kurb->usercontext = compat_ptr(uptr);
1137
1138         return 0;
1139 }
1140
1141 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1142 {
1143         struct usbdevfs_urb uurb;
1144
1145         if (get_urb32(&uurb,(struct usbdevfs_urb32 *)arg))
1146                 return -EFAULT;
1147
1148         return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg);
1149 }
1150
1151 static int processcompl_compat(struct async *as, void __user * __user *arg)
1152 {
1153         struct urb *urb = as->urb;
1154         struct usbdevfs_urb32 __user *userurb = as->userurb;
1155         void __user *addr = as->userurb;
1156         unsigned int i;
1157
1158         if (as->userbuffer)
1159                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1160                         return -EFAULT;
1161         if (put_user(urb->status, &userurb->status))
1162                 return -EFAULT;
1163         if (put_user(urb->actual_length, &userurb->actual_length))
1164                 return -EFAULT;
1165         if (put_user(urb->error_count, &userurb->error_count))
1166                 return -EFAULT;
1167
1168         if (usb_pipeisoc(urb->pipe)) {
1169                 for (i = 0; i < urb->number_of_packets; i++) {
1170                         if (put_user(urb->iso_frame_desc[i].actual_length,
1171                                      &userurb->iso_frame_desc[i].actual_length))
1172                                 return -EFAULT;
1173                         if (put_user(urb->iso_frame_desc[i].status,
1174                                      &userurb->iso_frame_desc[i].status))
1175                                 return -EFAULT;
1176                 }
1177         }
1178
1179         free_async(as);
1180         if (put_user((u32)(u64)addr, (u32 __user *)arg))
1181                 return -EFAULT;
1182         return 0;
1183 }
1184
1185 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1186 {
1187         struct async *as = reap_as(ps);
1188         if (as)
1189                 return processcompl_compat(as, (void __user * __user *)arg);
1190         if (signal_pending(current))
1191                 return -EINTR;
1192         return -EIO;
1193 }
1194
1195 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1196 {
1197         struct async *as;
1198
1199         if (!(as = async_getcompleted(ps)))
1200                 return -EAGAIN;
1201         return processcompl_compat(as, (void __user * __user *)arg);
1202 }
1203
1204 #endif
1205
1206 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1207 {
1208         struct usbdevfs_disconnectsignal ds;
1209
1210         if (copy_from_user(&ds, arg, sizeof(ds)))
1211                 return -EFAULT;
1212         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1213                 return -EINVAL;
1214         ps->discsignr = ds.signr;
1215         ps->disccontext = ds.context;
1216         return 0;
1217 }
1218
1219 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1220 {
1221         unsigned int ifnum;
1222
1223         if (get_user(ifnum, (unsigned int __user *)arg))
1224                 return -EFAULT;
1225         return claimintf(ps, ifnum);
1226 }
1227
1228 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1229 {
1230         unsigned int ifnum;
1231         int ret;
1232
1233         if (get_user(ifnum, (unsigned int __user *)arg))
1234                 return -EFAULT;
1235         if ((ret = releaseintf(ps, ifnum)) < 0)
1236                 return ret;
1237         destroy_async_on_interface (ps, ifnum);
1238         return 0;
1239 }
1240
1241 static int proc_ioctl (struct dev_state *ps, void __user *arg)
1242 {
1243         struct usbdevfs_ioctl   ctrl;
1244         int                     size;
1245         void                    *buf = NULL;
1246         int                     retval = 0;
1247         struct usb_interface    *intf = NULL;
1248         struct usb_driver       *driver = NULL;
1249
1250         /* get input parameters and alloc buffer */
1251         if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
1252                 return -EFAULT;
1253         if ((size = _IOC_SIZE (ctrl.ioctl_code)) > 0) {
1254                 if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
1255                         return -ENOMEM;
1256                 if ((_IOC_DIR(ctrl.ioctl_code) & _IOC_WRITE)) {
1257                         if (copy_from_user (buf, ctrl.data, size)) {
1258                                 kfree(buf);
1259                                 return -EFAULT;
1260                         }
1261                 } else {
1262                         memset (buf, 0, size);
1263                 }
1264         }
1265
1266         if (!connected(ps->dev)) {
1267                 kfree(buf);
1268                 return -ENODEV;
1269         }
1270
1271         if (ps->dev->state != USB_STATE_CONFIGURED)
1272                 retval = -EHOSTUNREACH;
1273         else if (!(intf = usb_ifnum_to_if (ps->dev, ctrl.ifno)))
1274                retval = -EINVAL;
1275         else switch (ctrl.ioctl_code) {
1276
1277         /* disconnect kernel driver from interface */
1278         case USBDEVFS_DISCONNECT:
1279
1280                 down_write(&usb_bus_type.subsys.rwsem);
1281                 if (intf->dev.driver) {
1282                         driver = to_usb_driver(intf->dev.driver);
1283                         dev_dbg (&intf->dev, "disconnect by usbfs\n");
1284                         usb_driver_release_interface(driver, intf);
1285                 } else
1286                         retval = -ENODATA;
1287                 up_write(&usb_bus_type.subsys.rwsem);
1288                 break;
1289
1290         /* let kernel drivers try to (re)bind to the interface */
1291         case USBDEVFS_CONNECT:
1292                 usb_unlock_device(ps->dev);
1293                 usb_lock_all_devices();
1294                 bus_rescan_devices(intf->dev.bus);
1295                 usb_unlock_all_devices();
1296                 usb_lock_device(ps->dev);
1297                 break;
1298
1299         /* talk directly to the interface's driver */
1300         default:
1301                 down_read(&usb_bus_type.subsys.rwsem);
1302                 if (intf->dev.driver)
1303                         driver = to_usb_driver(intf->dev.driver);
1304                 if (driver == NULL || driver->ioctl == NULL) {
1305                         retval = -ENOTTY;
1306                 } else {
1307                         retval = driver->ioctl (intf, ctrl.ioctl_code, buf);
1308                         if (retval == -ENOIOCTLCMD)
1309                                 retval = -ENOTTY;
1310                 }
1311                 up_read(&usb_bus_type.subsys.rwsem);
1312         }
1313
1314         /* cleanup and return */
1315         if (retval >= 0
1316                         && (_IOC_DIR (ctrl.ioctl_code) & _IOC_READ) != 0
1317                         && size > 0
1318                         && copy_to_user (ctrl.data, buf, size) != 0)
1319                 retval = -EFAULT;
1320
1321         kfree(buf);
1322         return retval;
1323 }
1324
1325 /*
1326  * NOTE:  All requests here that have interface numbers as parameters
1327  * are assuming that somehow the configuration has been prevented from
1328  * changing.  But there's no mechanism to ensure that...
1329  */
1330 static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1331 {
1332         struct dev_state *ps = (struct dev_state *)file->private_data;
1333         struct usb_device *dev = ps->dev;
1334         void __user *p = (void __user *)arg;
1335         int ret = -ENOTTY;
1336
1337         if (!(file->f_mode & FMODE_WRITE))
1338                 return -EPERM;
1339         usb_lock_device(dev);
1340         if (!connected(dev)) {
1341                 usb_unlock_device(dev);
1342                 return -ENODEV;
1343         }
1344
1345         switch (cmd) {
1346         case USBDEVFS_CONTROL:
1347                 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
1348                 ret = proc_control(ps, p);
1349                 if (ret >= 0)
1350                         inode->i_mtime = CURRENT_TIME;
1351                 break;
1352
1353         case USBDEVFS_BULK:
1354                 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
1355                 ret = proc_bulk(ps, p);
1356                 if (ret >= 0)
1357                         inode->i_mtime = CURRENT_TIME;
1358                 break;
1359
1360         case USBDEVFS_RESETEP:
1361                 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
1362                 ret = proc_resetep(ps, p);
1363                 if (ret >= 0)
1364                         inode->i_mtime = CURRENT_TIME;
1365                 break;
1366
1367         case USBDEVFS_RESET:
1368                 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
1369                 ret = proc_resetdevice(ps);
1370                 break;
1371
1372         case USBDEVFS_CLEAR_HALT:
1373                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
1374                 ret = proc_clearhalt(ps, p);
1375                 if (ret >= 0)
1376                         inode->i_mtime = CURRENT_TIME;
1377                 break;
1378
1379         case USBDEVFS_GETDRIVER:
1380                 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
1381                 ret = proc_getdriver(ps, p);
1382                 break;
1383
1384         case USBDEVFS_CONNECTINFO:
1385                 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
1386                 ret = proc_connectinfo(ps, p);
1387                 break;
1388
1389         case USBDEVFS_SETINTERFACE:
1390                 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
1391                 ret = proc_setintf(ps, p);
1392                 break;
1393
1394         case USBDEVFS_SETCONFIGURATION:
1395                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
1396                 ret = proc_setconfig(ps, p);
1397                 break;
1398
1399         case USBDEVFS_SUBMITURB:
1400                 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
1401                 ret = proc_submiturb(ps, p);
1402                 if (ret >= 0)
1403                         inode->i_mtime = CURRENT_TIME;
1404                 break;
1405
1406 #ifdef CONFIG_COMPAT
1407
1408         case USBDEVFS_SUBMITURB32:
1409                 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
1410                 ret = proc_submiturb_compat(ps, p);
1411                 if (ret >= 0)
1412                         inode->i_mtime = CURRENT_TIME;
1413                 break;
1414
1415         case USBDEVFS_REAPURB32:
1416                 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
1417                 ret = proc_reapurb_compat(ps, p);
1418                 break;
1419
1420         case USBDEVFS_REAPURBNDELAY32:
1421                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
1422                 ret = proc_reapurbnonblock_compat(ps, p);
1423                 break;
1424
1425 #endif
1426
1427         case USBDEVFS_DISCARDURB:
1428                 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
1429                 ret = proc_unlinkurb(ps, p);
1430                 break;
1431
1432         case USBDEVFS_REAPURB:
1433                 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
1434                 ret = proc_reapurb(ps, p);
1435                 break;
1436
1437         case USBDEVFS_REAPURBNDELAY:
1438                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
1439                 ret = proc_reapurbnonblock(ps, p);
1440                 break;
1441
1442         case USBDEVFS_DISCSIGNAL:
1443                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
1444                 ret = proc_disconnectsignal(ps, p);
1445                 break;
1446
1447         case USBDEVFS_CLAIMINTERFACE:
1448                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
1449                 ret = proc_claiminterface(ps, p);
1450                 break;
1451
1452         case USBDEVFS_RELEASEINTERFACE:
1453                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
1454                 ret = proc_releaseinterface(ps, p);
1455                 break;
1456
1457         case USBDEVFS_IOCTL:
1458                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1459                 ret = proc_ioctl(ps, p);
1460                 break;
1461         }
1462         usb_unlock_device(dev);
1463         if (ret >= 0)
1464                 inode->i_atime = CURRENT_TIME;
1465         return ret;
1466 }
1467
1468 /* No kernel lock - fine */
1469 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
1470 {
1471         struct dev_state *ps = (struct dev_state *)file->private_data;
1472         unsigned int mask = 0;
1473
1474         poll_wait(file, &ps->wait, wait);
1475         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1476                 mask |= POLLOUT | POLLWRNORM;
1477         if (!connected(ps->dev))
1478                 mask |= POLLERR | POLLHUP;
1479         return mask;
1480 }
1481
1482 struct file_operations usbfs_device_file_operations = {
1483         .llseek =       usbdev_lseek,
1484         .read =         usbdev_read,
1485         .poll =         usbdev_poll,
1486         .ioctl =        usbdev_ioctl,
1487         .open =         usbdev_open,
1488         .release =      usbdev_release,
1489 };
1490
1491 struct usb_device *usbdev_lookup_minor(int minor)
1492 {
1493         struct class_device *class_dev;
1494         struct usb_device *dev = NULL;
1495
1496         down(&usb_device_class->sem);
1497         list_for_each_entry(class_dev, &usb_device_class->children, node) {
1498                 if (class_dev->devt == MKDEV(USB_DEVICE_MAJOR, minor)) {
1499                         dev = class_dev->class_data;
1500                         break;
1501                 }
1502         }
1503         up(&usb_device_class->sem);
1504
1505         return dev;
1506 };
1507
1508 void usbdev_add(struct usb_device *dev)
1509 {
1510         int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1511
1512         dev->class_dev = class_device_create(usb_device_class,
1513                                 MKDEV(USB_DEVICE_MAJOR, minor), &dev->dev,
1514                                 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1515
1516         dev->class_dev->class_data = dev;
1517 }
1518
1519 void usbdev_remove(struct usb_device *dev)
1520 {
1521         class_device_unregister(dev->class_dev);
1522 }
1523
1524 static struct cdev usb_device_cdev = {
1525         .kobj   = {.name = "usb_device", },
1526         .owner  = THIS_MODULE,
1527 };
1528
1529 int __init usbdev_init(void)
1530 {
1531         int retval;
1532
1533         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1534                         "usb_device");
1535         if (retval) {
1536                 err("unable to register minors for usb_device");
1537                 goto out;
1538         }
1539         cdev_init(&usb_device_cdev, &usbfs_device_file_operations);
1540         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1541         if (retval) {
1542                 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1543                 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1544                 goto out;
1545         }
1546         usb_device_class = class_create(THIS_MODULE, "usb_device");
1547         if (IS_ERR(usb_device_class)) {
1548                 err("unable to register usb_device class");
1549                 retval = PTR_ERR(usb_device_class);
1550                 usb_device_class = NULL;
1551                 cdev_del(&usb_device_cdev);
1552                 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1553         }
1554
1555 out:
1556         return retval;
1557 }
1558
1559 void usbdev_cleanup(void)
1560 {
1561         class_destroy(usb_device_class);
1562         cdev_del(&usb_device_cdev);
1563         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1564 }
1565