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