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

   1 /*****************************************************************************/
   2
   3 /*
   4  *      devio.c  --  User space communication with USB devices.
   5  *
   6  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   7  *
   8  *      This program is free software; you can redistribute it and/or modify
   9  *      it under the terms of the GNU General Public License as published by
  10  *      the Free Software Foundation; either version 2 of the License, or
  11  *      (at your option) any later version.
  12  *
  13  *      This program is distributed in the hope that it will be useful,
  14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *      GNU General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License
  19  *      along with this program; if not, write to the Free Software
  20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  *  $Id: devio.c,v 1.7 2000/02/01 17:28:48 fliegl Exp $
  23  *
  24  *  This file implements the usbfs/x/y files, where
  25  *  x is the bus number and y the device number.
  26  *
  27  *  It allows user space programs/"drivers" to communicate directly
  28  *  with USB devices without intervening kernel driver.
  29  *
  30  *  Revision history
  31  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  32  *    04.01.2000   0.2   Turned into its own filesystem
  33  *    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 <linux/notifier.h>
  50 #include <linux/security.h>
  51 #include <asm/uaccess.h>
  52 #include <asm/byteorder.h>
  53 #include <linux/moduleparam.h>
  54
  55 #include "hcd.h"        /* for usbcore internals */
  56 #include "usb.h"
  57
  58 #define USB_MAXBUS                      64
  59 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
  60 static struct class *usb_device_class;
  61
  62 /* Mutual exclusion for removal, open, and release */
  63 DEFINE_MUTEX(usbfs_mutex);
  64
  65 struct async {
  66         struct list_head asynclist;
  67         struct dev_state *ps;
  68         struct pid *pid;
  69         uid_t uid, euid;
  70         unsigned int signr;
  71         unsigned int ifnum;
  72         void __user *userbuffer;
  73         void __user *userurb;
  74         struct urb *urb;
  75         u32 secid;
  76 };
  77
  78 static int usbfs_snoop = 0;
  79 module_param (usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  80 MODULE_PARM_DESC (usbfs_snoop, "true to log all usbfs traffic");
  81
  82 #define snoop(dev, format, arg...)                              \
  83         do {                                                    \
  84                 if (usbfs_snoop)                                \
  85                         dev_info( dev , format , ## arg);       \
  86         } while (0)
  87
  88 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
  89
  90
  91 #define MAX_USBFS_BUFFER_SIZE   16384
  92
  93 static inline int connected (struct dev_state *ps)
  94 {
  95         return (!list_empty(&ps->list) &&
  96                         ps->dev->state != USB_STATE_NOTATTACHED);
  97 }
  98
  99 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
 100 {
 101         loff_t ret;
 102
 103         lock_kernel();
 104
 105         switch (orig) {
 106         case 0:
 107                 file->f_pos = offset;
 108                 ret = file->f_pos;
 109                 break;
 110         case 1:
 111                 file->f_pos += offset;
 112                 ret = file->f_pos;
 113                 break;
 114         case 2:
 115         default:
 116                 ret = -EINVAL;
 117         }
 118
 119         unlock_kernel();
 120         return ret;
 121 }
 122
 123 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
 124 {
 125         struct dev_state *ps = file->private_data;
 126         struct usb_device *dev = ps->dev;
 127         ssize_t ret = 0;
 128         unsigned len;
 129         loff_t pos;
 130         int i;
 131
 132         pos = *ppos;
 133         usb_lock_device(dev);
 134         if (!connected(ps)) {
 135                 ret = -ENODEV;
 136                 goto err;
 137         } else if (pos < 0) {
 138                 ret = -EINVAL;
 139                 goto err;
 140         }
 141
 142         if (pos < sizeof(struct usb_device_descriptor)) {
 143                 struct usb_device_descriptor temp_desc ; /* 18 bytes - fits on the stack */
 144
 145                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 146                 le16_to_cpus(&temp_desc.bcdUSB);
 147                 le16_to_cpus(&temp_desc.idVendor);
 148                 le16_to_cpus(&temp_desc.idProduct);
 149                 le16_to_cpus(&temp_desc.bcdDevice);
 150
 151                 len = sizeof(struct usb_device_descriptor) - pos;
 152                 if (len > nbytes)
 153                         len = nbytes;
 154                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 155                         ret = -EFAULT;
 156                         goto err;
 157                 }
 158
 159                 *ppos += len;
 160                 buf += len;
 161                 nbytes -= len;
 162                 ret += len;
 163         }
 164
 165         pos = sizeof(struct usb_device_descriptor);
 166         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 167                 struct usb_config_descriptor *config =
 168                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 169                 unsigned int length = le16_to_cpu(config->wTotalLength);
 170
 171                 if (*ppos < pos + length) {
 172
 173                         /* The descriptor may claim to be longer than it
 174                          * really is.  Here is the actual allocated length. */
 175                         unsigned alloclen =
 176                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 177
 178                         len = length - (*ppos - pos);
 179                         if (len > nbytes)
 180                                 len = nbytes;
 181
 182                         /* Simply don't write (skip over) unallocated parts */
 183                         if (alloclen > (*ppos - pos)) {
 184                                 alloclen -= (*ppos - pos);
 185                                 if (copy_to_user(buf,
 186                                     dev->rawdescriptors[i] + (*ppos - pos),
 187                                     min(len, alloclen))) {
 188                                         ret = -EFAULT;
 189                                         goto err;
 190                                 }
 191                         }
 192
 193                         *ppos += len;
 194                         buf += len;
 195                         nbytes -= len;
 196                         ret += len;
 197                 }
 198
 199                 pos += length;
 200         }
 201
 202 err:
 203         usb_unlock_device(dev);
 204         return ret;
 205 }
 206
 207 /*
 208  * async list handling
 209  */
 210
 211 static struct async *alloc_async(unsigned int numisoframes)
 212 {
 213         unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor);
 214         struct async *as = kzalloc(assize, GFP_KERNEL);
 215
 216         if (!as)
 217                 return NULL;
 218         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 219         if (!as->urb) {
 220                 kfree(as);
 221                 return NULL;
 222         }
 223         return as;
 224 }
 225
 226 static void free_async(struct async *as)
 227 {
 228         put_pid(as->pid);
 229         kfree(as->urb->transfer_buffer);
 230         kfree(as->urb->setup_packet);
 231         usb_free_urb(as->urb);
 232         kfree(as);
 233 }
 234
 235 static inline void async_newpending(struct async *as)
 236 {
 237         struct dev_state *ps = as->ps;
 238         unsigned long flags;
 239
 240         spin_lock_irqsave(&ps->lock, flags);
 241         list_add_tail(&as->asynclist, &ps->async_pending);
 242         spin_unlock_irqrestore(&ps->lock, flags);
 243 }
 244
 245 static inline void async_removepending(struct async *as)
 246 {
 247         struct dev_state *ps = as->ps;
 248         unsigned long flags;
 249
 250         spin_lock_irqsave(&ps->lock, flags);
 251         list_del_init(&as->asynclist);
 252         spin_unlock_irqrestore(&ps->lock, flags);
 253 }
 254
 255 static inline struct async *async_getcompleted(struct dev_state *ps)
 256 {
 257         unsigned long flags;
 258         struct async *as = NULL;
 259
 260         spin_lock_irqsave(&ps->lock, flags);
 261         if (!list_empty(&ps->async_completed)) {
 262                 as = list_entry(ps->async_completed.next, struct async, asynclist);
 263                 list_del_init(&as->asynclist);
 264         }
 265         spin_unlock_irqrestore(&ps->lock, flags);
 266         return as;
 267 }
 268
 269 static inline struct async *async_getpending(struct dev_state *ps, void __user *userurb)
 270 {
 271         unsigned long flags;
 272         struct async *as;
 273
 274         spin_lock_irqsave(&ps->lock, flags);
 275         list_for_each_entry(as, &ps->async_pending, asynclist)
 276                 if (as->userurb == userurb) {
 277                         list_del_init(&as->asynclist);
 278                         spin_unlock_irqrestore(&ps->lock, flags);
 279                         return as;
 280                 }
 281         spin_unlock_irqrestore(&ps->lock, flags);
 282         return NULL;
 283 }
 284
 285 static void snoop_urb(struct urb *urb, void __user *userurb)
 286 {
 287         int j;
 288         unsigned char *data = urb->transfer_buffer;
 289
 290         if (!usbfs_snoop)
 291                 return;
 292
 293         if (urb->pipe & USB_DIR_IN)
 294                 dev_info(&urb->dev->dev, "direction=IN\n");
 295         else
 296                 dev_info(&urb->dev->dev, "direction=OUT\n");
 297         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
 298         dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
 299                  urb->transfer_buffer_length);
 300         dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
 301         dev_info(&urb->dev->dev, "data: ");
 302         for (j = 0; j < urb->transfer_buffer_length; ++j)
 303                 printk ("%02x ", data[j]);
 304         printk("\n");
 305 }
 306
 307 static void async_completed(struct urb *urb)
 308 {
 309         struct async *as = urb->context;
 310         struct dev_state *ps = as->ps;
 311         struct siginfo sinfo;
 312
 313         spin_lock(&ps->lock);
 314         list_move_tail(&as->asynclist, &ps->async_completed);
 315         spin_unlock(&ps->lock);
 316         if (as->signr) {
 317                 sinfo.si_signo = as->signr;
 318                 sinfo.si_errno = as->urb->status;
 319                 sinfo.si_code = SI_ASYNCIO;
 320                 sinfo.si_addr = as->userurb;
 321                 kill_pid_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
 322                                       as->euid, as->secid);
 323         }
 324         snoop(&urb->dev->dev, "urb complete\n");
 325         snoop_urb(urb, as->userurb);
 326         wake_up(&ps->wait);
 327 }
 328
 329 static void destroy_async (struct dev_state *ps, struct list_head *list)
 330 {
 331         struct async *as;
 332         unsigned long flags;
 333
 334         spin_lock_irqsave(&ps->lock, flags);
 335         while (!list_empty(list)) {
 336                 as = list_entry(list->next, struct async, asynclist);
 337                 list_del_init(&as->asynclist);
 338
 339                 /* drop the spinlock so the completion handler can run */
 340                 spin_unlock_irqrestore(&ps->lock, flags);
 341                 usb_kill_urb(as->urb);
 342                 spin_lock_irqsave(&ps->lock, flags);
 343         }
 344         spin_unlock_irqrestore(&ps->lock, flags);
 345         as = async_getcompleted(ps);
 346         while (as) {
 347                 free_async(as);
 348                 as = async_getcompleted(ps);
 349         }
 350 }
 351
 352 static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum)
 353 {
 354         struct list_head *p, *q, hitlist;
 355         unsigned long flags;
 356
 357         INIT_LIST_HEAD(&hitlist);
 358         spin_lock_irqsave(&ps->lock, flags);
 359         list_for_each_safe(p, q, &ps->async_pending)
 360                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 361                         list_move_tail(p, &hitlist);
 362         spin_unlock_irqrestore(&ps->lock, flags);
 363         destroy_async(ps, &hitlist);
 364 }
 365
 366 static inline void destroy_all_async(struct dev_state *ps)
 367 {
 368                 destroy_async(ps, &ps->async_pending);
 369 }
 370
 371 /*
 372  * interface claims are made only at the request of user level code,
 373  * which can also release them (explicitly or by closing files).
 374  * they're also undone when devices disconnect.
 375  */
 376
 377 static int driver_probe (struct usb_interface *intf,
 378                          const struct usb_device_id *id)
 379 {
 380         return -ENODEV;
 381 }
 382
 383 static void driver_disconnect(struct usb_interface *intf)
 384 {
 385         struct dev_state *ps = usb_get_intfdata (intf);
 386         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 387
 388         if (!ps)
 389                 return;
 390
 391         /* NOTE:  this relies on usbcore having canceled and completed
 392          * all pending I/O requests; 2.6 does that.
 393          */
 394
 395         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 396                 clear_bit(ifnum, &ps->ifclaimed);
 397         else
 398                 warn("interface number %u out of range", ifnum);
 399
 400         usb_set_intfdata (intf, NULL);
 401
 402         /* force async requests to complete */
 403         destroy_async_on_interface(ps, ifnum);
 404 }
 405
 406 struct usb_driver usbfs_driver = {
 407         .name =         "usbfs",
 408         .probe =        driver_probe,
 409         .disconnect =   driver_disconnect,
 410 };
 411
 412 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 413 {
 414         struct usb_device *dev = ps->dev;
 415         struct usb_interface *intf;
 416         int err;
 417
 418         if (ifnum >= 8*sizeof(ps->ifclaimed))
 419                 return -EINVAL;
 420         /* already claimed */
 421         if (test_bit(ifnum, &ps->ifclaimed))
 422                 return 0;
 423
 424         /* lock against other changes to driver bindings */
 425         down_write(&usb_bus_type.subsys.rwsem);
 426         intf = usb_ifnum_to_if(dev, ifnum);
 427         if (!intf)
 428                 err = -ENOENT;
 429         else
 430                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 431         up_write(&usb_bus_type.subsys.rwsem);
 432         if (err == 0)
 433                 set_bit(ifnum, &ps->ifclaimed);
 434         return err;
 435 }
 436
 437 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 438 {
 439         struct usb_device *dev;
 440         struct usb_interface *intf;
 441         int err;
 442
 443         err = -EINVAL;
 444         if (ifnum >= 8*sizeof(ps->ifclaimed))
 445                 return err;
 446         dev = ps->dev;
 447         /* lock against other changes to driver bindings */
 448         down_write(&usb_bus_type.subsys.rwsem);
 449         intf = usb_ifnum_to_if(dev, ifnum);
 450         if (!intf)
 451                 err = -ENOENT;
 452         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 453                 usb_driver_release_interface(&usbfs_driver, intf);
 454                 err = 0;
 455         }
 456         up_write(&usb_bus_type.subsys.rwsem);
 457         return err;
 458 }
 459
 460 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 461 {
 462         if (ps->dev->state != USB_STATE_CONFIGURED)
 463                 return -EHOSTUNREACH;
 464         if (ifnum >= 8*sizeof(ps->ifclaimed))
 465                 return -EINVAL;
 466         if (test_bit(ifnum, &ps->ifclaimed))
 467                 return 0;
 468         /* if not yet claimed, claim it for the driver */
 469         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n",
 470                current->pid, current->comm, ifnum);
 471         return claimintf(ps, ifnum);
 472 }
 473
 474 static int findintfep(struct usb_device *dev, unsigned int ep)
 475 {
 476         unsigned int i, j, e;
 477         struct usb_interface *intf;
 478         struct usb_host_interface *alts;
 479         struct usb_endpoint_descriptor *endpt;
 480
 481         if (ep & ~(USB_DIR_IN|0xf))
 482                 return -EINVAL;
 483         if (!dev->actconfig)
 484                 return -ESRCH;
 485         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 486                 intf = dev->actconfig->interface[i];
 487                 for (j = 0; j < intf->num_altsetting; j++) {
 488                         alts = &intf->altsetting[j];
 489                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 490                                 endpt = &alts->endpoint[e].desc;
 491                                 if (endpt->bEndpointAddress == ep)
 492                                         return alts->desc.bInterfaceNumber;
 493                         }
 494                 }
 495         }
 496         return -ENOENT;
 497 }
 498
 499 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
 500 {
 501         int ret = 0;
 502
 503         if (ps->dev->state != USB_STATE_ADDRESS
 504          && ps->dev->state != USB_STATE_CONFIGURED)
 505                 return -EHOSTUNREACH;
 506         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 507                 return 0;
 508
 509         index &= 0xff;
 510         switch (requesttype & USB_RECIP_MASK) {
 511         case USB_RECIP_ENDPOINT:
 512                 if ((ret = findintfep(ps->dev, index)) >= 0)
 513                         ret = checkintf(ps, ret);
 514                 break;
 515
 516         case USB_RECIP_INTERFACE:
 517                 ret = checkintf(ps, index);
 518                 break;
 519         }
 520         return ret;
 521 }
 522
 523 static struct usb_device *usbdev_lookup_minor(int minor)
 524 {
 525         struct class_device *class_dev;
 526         struct usb_device *dev = NULL;
 527
 528         down(&usb_device_class->sem);
 529         list_for_each_entry(class_dev, &usb_device_class->children, node) {
 530                 if (class_dev->devt == MKDEV(USB_DEVICE_MAJOR, minor)) {
 531                         dev = class_dev->class_data;
 532                         break;
 533                 }
 534         }
 535         up(&usb_device_class->sem);
 536
 537         return dev;
 538 };
 539
 540 /*
 541  * file operations
 542  */
 543 static int usbdev_open(struct inode *inode, struct file *file)
 544 {
 545         struct usb_device *dev = NULL;
 546         struct dev_state *ps;
 547         int ret;
 548
 549         /* Protect against simultaneous removal or release */
 550         mutex_lock(&usbfs_mutex);
 551
 552         ret = -ENOMEM;
 553         if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
 554                 goto out;
 555
 556         ret = -ENOENT;
 557         /* check if we are called from a real node or usbfs */
 558         if (imajor(inode) == USB_DEVICE_MAJOR)
 559                 dev = usbdev_lookup_minor(iminor(inode));
 560         if (!dev)
 561                 dev = inode->i_private;
 562         if (!dev)
 563                 goto out;
 564         ret = usb_autoresume_device(dev, 1);
 565         if (ret)
 566                 goto out;
 567
 568         usb_get_dev(dev);
 569         ret = 0;
 570         ps->dev = dev;
 571         ps->file = file;
 572         spin_lock_init(&ps->lock);
 573         INIT_LIST_HEAD(&ps->async_pending);
 574         INIT_LIST_HEAD(&ps->async_completed);
 575         init_waitqueue_head(&ps->wait);
 576         ps->discsignr = 0;
 577         ps->disc_pid = get_pid(task_pid(current));
 578         ps->disc_uid = current->uid;
 579         ps->disc_euid = current->euid;
 580         ps->disccontext = NULL;
 581         ps->ifclaimed = 0;
 582         security_task_getsecid(current, &ps->secid);
 583         wmb();
 584         list_add_tail(&ps->list, &dev->filelist);
 585         file->private_data = ps;
 586  out:
 587         if (ret)
 588                 kfree(ps);
 589         mutex_unlock(&usbfs_mutex);
 590         return ret;
 591 }
 592
 593 static int usbdev_release(struct inode *inode, struct file *file)
 594 {
 595         struct dev_state *ps = file->private_data;
 596         struct usb_device *dev = ps->dev;
 597         unsigned int ifnum;
 598
 599         usb_lock_device(dev);
 600
 601         /* Protect against simultaneous open */
 602         mutex_lock(&usbfs_mutex);
 603         list_del_init(&ps->list);
 604         mutex_unlock(&usbfs_mutex);
 605
 606         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 607                         ifnum++) {
 608                 if (test_bit(ifnum, &ps->ifclaimed))
 609                         releaseintf(ps, ifnum);
 610         }
 611         destroy_all_async(ps);
 612         usb_autosuspend_device(dev, 1);
 613         usb_unlock_device(dev);
 614         usb_put_dev(dev);
 615         put_pid(ps->disc_pid);
 616         kfree(ps);
 617         return 0;
 618 }
 619
 620 static int proc_control(struct dev_state *ps, void __user *arg)
 621 {
 622         struct usb_device *dev = ps->dev;
 623         struct usbdevfs_ctrltransfer ctrl;
 624         unsigned int tmo;
 625         unsigned char *tbuf;
 626         int i, j, ret;
 627
 628         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 629                 return -EFAULT;
 630         if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
 631                 return ret;
 632         if (ctrl.wLength > PAGE_SIZE)
 633                 return -EINVAL;
 634         if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
 635                 return -ENOMEM;
 636         tmo = ctrl.timeout;
 637         if (ctrl.bRequestType & 0x80) {
 638                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
 639                         free_page((unsigned long)tbuf);
 640                         return -EINVAL;
 641                 }
 642                 snoop(&dev->dev, "control read: bRequest=%02x "
 643                                 "bRrequestType=%02x wValue=%04x "
 644                                 "wIndex=%04x wLength=%04x\n",
 645                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 646                                 ctrl.wIndex, ctrl.wLength);
 647
 648                 usb_unlock_device(dev);
 649                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 650                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 651                 usb_lock_device(dev);
 652                 if ((i > 0) && ctrl.wLength) {
 653                         if (usbfs_snoop) {
 654                                 dev_info(&dev->dev, "control read: data ");
 655                                 for (j = 0; j < i; ++j)
 656                                         printk("%02x ", (unsigned char)(tbuf)[j]);
 657                                 printk("\n");
 658                         }
 659                         if (copy_to_user(ctrl.data, tbuf, i)) {
 660                                 free_page((unsigned long)tbuf);
 661                                 return -EFAULT;
 662                         }
 663                 }
 664         } else {
 665                 if (ctrl.wLength) {
 666                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 667                                 free_page((unsigned long)tbuf);
 668                                 return -EFAULT;
 669                         }
 670                 }
 671                 snoop(&dev->dev, "control write: bRequest=%02x "
 672                                 "bRrequestType=%02x wValue=%04x "
 673                                 "wIndex=%04x wLength=%04x\n",
 674                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 675                                 ctrl.wIndex, ctrl.wLength);
 676                 if (usbfs_snoop) {
 677                         dev_info(&dev->dev, "control write: data: ");
 678                         for (j = 0; j < ctrl.wLength; ++j)
 679                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 680                         printk("\n");
 681                 }
 682                 usb_unlock_device(dev);
 683                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 684                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 685                 usb_lock_device(dev);
 686         }
 687         free_page((unsigned long)tbuf);
 688         if (i<0 && i != -EPIPE) {
 689                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 690                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 691                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 692                            ctrl.wLength, i);
 693         }
 694         return i;
 695 }
 696
 697 static int proc_bulk(struct dev_state *ps, void __user *arg)
 698 {
 699         struct usb_device *dev = ps->dev;
 700         struct usbdevfs_bulktransfer bulk;
 701         unsigned int tmo, len1, pipe;
 702         int len2;
 703         unsigned char *tbuf;
 704         int i, j, ret;
 705
 706         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 707                 return -EFAULT;
 708         if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
 709                 return ret;
 710         if ((ret = checkintf(ps, ret)))
 711                 return ret;
 712         if (bulk.ep & USB_DIR_IN)
 713                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 714         else
 715                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 716         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 717                 return -EINVAL;
 718         len1 = bulk.len;
 719         if (len1 > MAX_USBFS_BUFFER_SIZE)
 720                 return -EINVAL;
 721         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 722                 return -ENOMEM;
 723         tmo = bulk.timeout;
 724         if (bulk.ep & 0x80) {
 725                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 726                         kfree(tbuf);
 727                         return -EINVAL;
 728                 }
 729                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
 730                         bulk.len, bulk.timeout);
 731                 usb_unlock_device(dev);
 732                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 733                 usb_lock_device(dev);
 734                 if (!i && len2) {
 735                         if (usbfs_snoop) {
 736                                 dev_info(&dev->dev, "bulk read: data ");
 737                                 for (j = 0; j < len2; ++j)
 738                                         printk("%02x ", (unsigned char)(tbuf)[j]);
 739                                 printk("\n");
 740                         }
 741                         if (copy_to_user(bulk.data, tbuf, len2)) {
 742                                 kfree(tbuf);
 743                                 return -EFAULT;
 744                         }
 745                 }
 746         } else {
 747                 if (len1) {
 748                         if (copy_from_user(tbuf, bulk.data, len1)) {
 749                                 kfree(tbuf);
 750                                 return -EFAULT;
 751                         }
 752                 }
 753                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
 754                         bulk.len, bulk.timeout);
 755                 if (usbfs_snoop) {
 756                         dev_info(&dev->dev, "bulk write: data: ");
 757                         for (j = 0; j < len1; ++j)
 758                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 759                         printk("\n");
 760                 }
 761                 usb_unlock_device(dev);
 762                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 763                 usb_lock_device(dev);
 764         }
 765         kfree(tbuf);
 766         if (i < 0)
 767                 return i;
 768         return len2;
 769 }
 770
 771 static int proc_resetep(struct dev_state *ps, void __user *arg)
 772 {
 773         unsigned int ep;
 774         int ret;
 775
 776         if (get_user(ep, (unsigned int __user *)arg))
 777                 return -EFAULT;
 778         if ((ret = findintfep(ps->dev, ep)) < 0)
 779                 return ret;
 780         if ((ret = checkintf(ps, ret)))
 781                 return ret;
 782         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
 783         return 0;
 784 }
 785
 786 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 787 {
 788         unsigned int ep;
 789         int pipe;
 790         int ret;
 791
 792         if (get_user(ep, (unsigned int __user *)arg))
 793                 return -EFAULT;
 794         if ((ret = findintfep(ps->dev, ep)) < 0)
 795                 return ret;
 796         if ((ret = checkintf(ps, ret)))
 797                 return ret;
 798         if (ep & USB_DIR_IN)
 799                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 800         else
 801                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 802
 803         return usb_clear_halt(ps->dev, pipe);
 804 }
 805
 806
 807 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 808 {
 809         struct usbdevfs_getdriver gd;
 810         struct usb_interface *intf;
 811         int ret;
 812
 813         if (copy_from_user(&gd, arg, sizeof(gd)))
 814                 return -EFAULT;
 815         down_read(&usb_bus_type.subsys.rwsem);
 816         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 817         if (!intf || !intf->dev.driver)
 818                 ret = -ENODATA;
 819         else {
 820                 strncpy(gd.driver, intf->dev.driver->name,
 821                                 sizeof(gd.driver));
 822                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 823         }
 824         up_read(&usb_bus_type.subsys.rwsem);
 825         return ret;
 826 }
 827
 828 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 829 {
 830         struct usbdevfs_connectinfo ci;
 831
 832         ci.devnum = ps->dev->devnum;
 833         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 834         if (copy_to_user(arg, &ci, sizeof(ci)))
 835                 return -EFAULT;
 836         return 0;
 837 }
 838
 839 static int proc_resetdevice(struct dev_state *ps)
 840 {
 841         return usb_reset_composite_device(ps->dev, NULL);
 842 }
 843
 844 static int proc_setintf(struct dev_state *ps, void __user *arg)
 845 {
 846         struct usbdevfs_setinterface setintf;
 847         int ret;
 848
 849         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 850                 return -EFAULT;
 851         if ((ret = checkintf(ps, setintf.interface)))
 852                 return ret;
 853         return usb_set_interface(ps->dev, setintf.interface,
 854                         setintf.altsetting);
 855 }
 856
 857 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 858 {
 859         unsigned int u;
 860         int status = 0;
 861         struct usb_host_config *actconfig;
 862
 863         if (get_user(u, (unsigned int __user *)arg))
 864                 return -EFAULT;
 865
 866         actconfig = ps->dev->actconfig;
 867
 868         /* Don't touch the device if any interfaces are claimed.
 869          * It could interfere with other drivers' operations, and if
 870          * an interface is claimed by usbfs it could easily deadlock.
 871          */
 872         if (actconfig) {
 873                 int i;
 874
 875                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 876                         if (usb_interface_claimed(actconfig->interface[i])) {
 877                                 dev_warn (&ps->dev->dev,
 878                                         "usbfs: interface %d claimed by %s "
 879                                         "while '%s' sets config #%d\n",
 880                                         actconfig->interface[i]
 881                                                 ->cur_altsetting
 882                                                 ->desc.bInterfaceNumber,
 883                                         actconfig->interface[i]
 884                                                 ->dev.driver->name,
 885                                         current->comm, u);
 886                                 status = -EBUSY;
 887                                 break;
 888                         }
 889                 }
 890         }
 891
 892         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 893          * so avoid usb_set_configuration()'s kick to sysfs
 894          */
 895         if (status == 0) {
 896                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 897                         status = usb_reset_configuration(ps->dev);
 898                 else
 899                         status = usb_set_configuration(ps->dev, u);
 900         }
 901
 902         return status;
 903 }
 904
 905 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 906                              struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
 907                              void __user *arg)
 908 {
 909         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 910         struct usb_host_endpoint *ep;
 911         struct async *as;
 912         struct usb_ctrlrequest *dr = NULL;
 913         unsigned int u, totlen, isofrmlen;
 914         int ret, interval = 0, ifnum = -1;
 915
 916         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
 917                            URB_NO_FSBR|URB_ZERO_PACKET))
 918                 return -EINVAL;
 919         if (!uurb->buffer)
 920                 return -EINVAL;
 921         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
 922                 return -EINVAL;
 923         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
 924                 if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
 925                         return ifnum;
 926                 if ((ret = checkintf(ps, ifnum)))
 927                         return ret;
 928         }
 929         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0)
 930                 ep = ps->dev->ep_in [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 931         else
 932                 ep = ps->dev->ep_out [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 933         if (!ep)
 934                 return -ENOENT;
 935         switch(uurb->type) {
 936         case USBDEVFS_URB_TYPE_CONTROL:
 937                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 938                                 != USB_ENDPOINT_XFER_CONTROL)
 939                         return -EINVAL;
 940                 /* min 8 byte setup packet, max 8 byte setup plus an arbitrary data stage */
 941                 if (uurb->buffer_length < 8 || uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
 942                         return -EINVAL;
 943                 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
 944                         return -ENOMEM;
 945                 if (copy_from_user(dr, uurb->buffer, 8)) {
 946                         kfree(dr);
 947                         return -EFAULT;
 948                 }
 949                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
 950                         kfree(dr);
 951                         return -EINVAL;
 952                 }
 953                 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
 954                         kfree(dr);
 955                         return ret;
 956                 }
 957                 uurb->endpoint = (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK);
 958                 uurb->number_of_packets = 0;
 959                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
 960                 uurb->buffer += 8;
 961                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ?  VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) {
 962                         kfree(dr);
 963                         return -EFAULT;
 964                 }
 965                 snoop(&ps->dev->dev, "control urb\n");
 966                 break;
 967
 968         case USBDEVFS_URB_TYPE_BULK:
 969                 switch (ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 970                 case USB_ENDPOINT_XFER_CONTROL:
 971                 case USB_ENDPOINT_XFER_ISOC:
 972                         return -EINVAL;
 973                 /* allow single-shot interrupt transfers, at bogus rates */
 974                 }
 975                 uurb->number_of_packets = 0;
 976                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
 977                         return -EINVAL;
 978                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
 979                         return -EFAULT;
 980                 snoop(&ps->dev->dev, "bulk urb\n");
 981                 break;
 982
 983         case USBDEVFS_URB_TYPE_ISO:
 984                 /* arbitrary limit */
 985                 if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
 986                         return -EINVAL;
 987                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 988                                 != USB_ENDPOINT_XFER_ISOC)
 989                         return -EINVAL;
 990                 interval = 1 << min (15, ep->desc.bInterval - 1);
 991                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
 992                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
 993                         return -ENOMEM;
 994                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
 995                         kfree(isopkt);
 996                         return -EFAULT;
 997                 }
 998                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
 999                         /* arbitrary limit, sufficient for USB 2.0 high-bandwidth iso */
1000                         if (isopkt[u].length > 8192) {
1001                                 kfree(isopkt);
1002                                 return -EINVAL;
1003                         }
1004                         totlen += isopkt[u].length;
1005                 }
1006                 if (totlen > 32768) {
1007                         kfree(isopkt);
1008                         return -EINVAL;
1009                 }
1010                 uurb->buffer_length = totlen;
1011                 snoop(&ps->dev->dev, "iso urb\n");
1012                 break;
1013
1014         case USBDEVFS_URB_TYPE_INTERRUPT:
1015                 uurb->number_of_packets = 0;
1016                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
1017                                 != USB_ENDPOINT_XFER_INT)
1018                         return -EINVAL;
1019                 if (ps->dev->speed == USB_SPEED_HIGH)
1020                         interval = 1 << min (15, ep->desc.bInterval - 1);
1021                 else
1022                         interval = ep->desc.bInterval;
1023                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1024                         return -EINVAL;
1025                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
1026                         return -EFAULT;
1027                 snoop(&ps->dev->dev, "interrupt urb\n");
1028                 break;
1029
1030         default:
1031                 return -EINVAL;
1032         }
1033         if (!(as = alloc_async(uurb->number_of_packets))) {
1034                 kfree(isopkt);
1035                 kfree(dr);
1036                 return -ENOMEM;
1037         }
1038         if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
1039                 kfree(isopkt);
1040                 kfree(dr);
1041                 free_async(as);
1042                 return -ENOMEM;
1043         }
1044         as->urb->dev = ps->dev;
1045         as->urb->pipe = (uurb->type << 30) | __create_pipe(ps->dev, uurb->endpoint & 0xf) | (uurb->endpoint & USB_DIR_IN);
1046         as->urb->transfer_flags = uurb->flags;
1047         as->urb->transfer_buffer_length = uurb->buffer_length;
1048         as->urb->setup_packet = (unsigned char*)dr;
1049         as->urb->start_frame = uurb->start_frame;
1050         as->urb->number_of_packets = uurb->number_of_packets;
1051         as->urb->interval = interval;
1052         as->urb->context = as;
1053         as->urb->complete = async_completed;
1054         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1055                 as->urb->iso_frame_desc[u].offset = totlen;
1056                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1057                 totlen += isopkt[u].length;
1058         }
1059         kfree(isopkt);
1060         as->ps = ps;
1061         as->userurb = arg;
1062         if (uurb->endpoint & USB_DIR_IN)
1063                 as->userbuffer = uurb->buffer;
1064         else
1065                 as->userbuffer = NULL;
1066         as->signr = uurb->signr;
1067         as->ifnum = ifnum;
1068         as->pid = get_pid(task_pid(current));
1069         as->uid = current->uid;
1070         as->euid = current->euid;
1071         security_task_getsecid(current, &as->secid);
1072         if (!(uurb->endpoint & USB_DIR_IN)) {
1073                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, as->urb->transfer_buffer_length)) {
1074                         free_async(as);
1075                         return -EFAULT;
1076                 }
1077         }
1078         snoop(&as->urb->dev->dev, "submit urb\n");
1079         snoop_urb(as->urb, as->userurb);
1080         async_newpending(as);
1081         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1082                 dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
1083                 async_removepending(as);
1084                 free_async(as);
1085                 return ret;
1086         }
1087         return 0;
1088 }
1089
1090 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1091 {
1092         struct usbdevfs_urb uurb;
1093
1094         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1095                 return -EFAULT;
1096
1097         return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg);
1098 }
1099
1100 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1101 {
1102         struct async *as;
1103
1104         as = async_getpending(ps, arg);
1105         if (!as)
1106                 return -EINVAL;
1107         usb_kill_urb(as->urb);
1108         return 0;
1109 }
1110
1111 static int processcompl(struct async *as, void __user * __user *arg)
1112 {
1113         struct urb *urb = as->urb;
1114         struct usbdevfs_urb __user *userurb = as->userurb;
1115         void __user *addr = as->userurb;
1116         unsigned int i;
1117
1118         if (as->userbuffer)
1119                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1120                         return -EFAULT;
1121         if (put_user(urb->status, &userurb->status))
1122                 return -EFAULT;
1123         if (put_user(urb->actual_length, &userurb->actual_length))
1124                 return -EFAULT;
1125         if (put_user(urb->error_count, &userurb->error_count))
1126                 return -EFAULT;
1127
1128         if (usb_pipeisoc(urb->pipe)) {
1129                 for (i = 0; i < urb->number_of_packets; i++) {
1130                         if (put_user(urb->iso_frame_desc[i].actual_length,
1131                                      &userurb->iso_frame_desc[i].actual_length))
1132                                 return -EFAULT;
1133                         if (put_user(urb->iso_frame_desc[i].status,
1134                                      &userurb->iso_frame_desc[i].status))
1135                                 return -EFAULT;
1136                 }
1137         }
1138
1139         free_async(as);
1140
1141         if (put_user(addr, (void __user * __user *)arg))
1142                 return -EFAULT;
1143         return 0;
1144 }
1145
1146 static struct async* reap_as(struct dev_state *ps)
1147 {
1148         DECLARE_WAITQUEUE(wait, current);
1149         struct async *as = NULL;
1150         struct usb_device *dev = ps->dev;
1151
1152         add_wait_queue(&ps->wait, &wait);
1153         for (;;) {
1154                 __set_current_state(TASK_INTERRUPTIBLE);
1155                 if ((as = async_getcompleted(ps)))
1156                         break;
1157                 if (signal_pending(current))
1158                         break;
1159                 usb_unlock_device(dev);
1160                 schedule();
1161                 usb_lock_device(dev);
1162         }
1163         remove_wait_queue(&ps->wait, &wait);
1164         set_current_state(TASK_RUNNING);
1165         return as;
1166 }
1167
1168 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1169 {
1170         struct async *as = reap_as(ps);
1171         if (as)
1172                 return processcompl(as, (void __user * __user *)arg);
1173         if (signal_pending(current))
1174                 return -EINTR;
1175         return -EIO;
1176 }
1177
1178 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1179 {
1180         struct async *as;
1181
1182         if (!(as = async_getcompleted(ps)))
1183                 return -EAGAIN;
1184         return processcompl(as, (void __user * __user *)arg);
1185 }
1186
1187 #ifdef CONFIG_COMPAT
1188
1189 static int get_urb32(struct usbdevfs_urb *kurb,
1190                      struct usbdevfs_urb32 __user *uurb)
1191 {
1192         __u32  uptr;
1193         if (get_user(kurb->type, &uurb->type) ||
1194             __get_user(kurb->endpoint, &uurb->endpoint) ||
1195             __get_user(kurb->status, &uurb->status) ||
1196             __get_user(kurb->flags, &uurb->flags) ||
1197             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1198             __get_user(kurb->actual_length, &uurb->actual_length) ||
1199             __get_user(kurb->start_frame, &uurb->start_frame) ||
1200             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1201             __get_user(kurb->error_count, &uurb->error_count) ||
1202             __get_user(kurb->signr, &uurb->signr))
1203                 return -EFAULT;
1204
1205         if (__get_user(uptr, &uurb->buffer))
1206                 return -EFAULT;
1207         kurb->buffer = compat_ptr(uptr);
1208         if (__get_user(uptr, &uurb->buffer))
1209                 return -EFAULT;
1210         kurb->usercontext = compat_ptr(uptr);
1211
1212         return 0;
1213 }
1214
1215 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1216 {
1217         struct usbdevfs_urb uurb;
1218
1219         if (get_urb32(&uurb,(struct usbdevfs_urb32 __user *)arg))
1220                 return -EFAULT;
1221
1222         return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg);
1223 }
1224
1225 static int processcompl_compat(struct async *as, void __user * __user *arg)
1226 {
1227         struct urb *urb = as->urb;
1228         struct usbdevfs_urb32 __user *userurb = as->userurb;
1229         void __user *addr = as->userurb;
1230         unsigned int i;
1231
1232         if (as->userbuffer)
1233                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1234                         return -EFAULT;
1235         if (put_user(urb->status, &userurb->status))
1236                 return -EFAULT;
1237         if (put_user(urb->actual_length, &userurb->actual_length))
1238                 return -EFAULT;
1239         if (put_user(urb->error_count, &userurb->error_count))
1240                 return -EFAULT;
1241
1242         if (usb_pipeisoc(urb->pipe)) {
1243                 for (i = 0; i < urb->number_of_packets; i++) {
1244                         if (put_user(urb->iso_frame_desc[i].actual_length,
1245                                      &userurb->iso_frame_desc[i].actual_length))
1246                                 return -EFAULT;
1247                         if (put_user(urb->iso_frame_desc[i].status,
1248                                      &userurb->iso_frame_desc[i].status))
1249                                 return -EFAULT;
1250                 }
1251         }
1252
1253         free_async(as);
1254         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1255                 return -EFAULT;
1256         return 0;
1257 }
1258
1259 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1260 {
1261         struct async *as = reap_as(ps);
1262         if (as)
1263                 return processcompl_compat(as, (void __user * __user *)arg);
1264         if (signal_pending(current))
1265                 return -EINTR;
1266         return -EIO;
1267 }
1268
1269 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1270 {
1271         struct async *as;
1272
1273         if (!(as = async_getcompleted(ps)))
1274                 return -EAGAIN;
1275         return processcompl_compat(as, (void __user * __user *)arg);
1276 }
1277
1278 #endif
1279
1280 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1281 {
1282         struct usbdevfs_disconnectsignal ds;
1283
1284         if (copy_from_user(&ds, arg, sizeof(ds)))
1285                 return -EFAULT;
1286         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1287                 return -EINVAL;
1288         ps->discsignr = ds.signr;
1289         ps->disccontext = ds.context;
1290         return 0;
1291 }
1292
1293 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1294 {
1295         unsigned int ifnum;
1296
1297         if (get_user(ifnum, (unsigned int __user *)arg))
1298                 return -EFAULT;
1299         return claimintf(ps, ifnum);
1300 }
1301
1302 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1303 {
1304         unsigned int ifnum;
1305         int ret;
1306
1307         if (get_user(ifnum, (unsigned int __user *)arg))
1308                 return -EFAULT;
1309         if ((ret = releaseintf(ps, ifnum)) < 0)
1310                 return ret;
1311         destroy_async_on_interface (ps, ifnum);
1312         return 0;
1313 }
1314
1315 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1316 {
1317         int                     size;
1318         void                    *buf = NULL;
1319         int                     retval = 0;
1320         struct usb_interface    *intf = NULL;
1321         struct usb_driver       *driver = NULL;
1322
1323         /* alloc buffer */
1324         if ((size = _IOC_SIZE (ctl->ioctl_code)) > 0) {
1325                 if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
1326                         return -ENOMEM;
1327                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1328                         if (copy_from_user (buf, ctl->data, size)) {
1329                                 kfree(buf);
1330                                 return -EFAULT;
1331                         }
1332                 } else {
1333                         memset (buf, 0, size);
1334                 }
1335         }
1336
1337         if (!connected(ps)) {
1338                 kfree(buf);
1339                 return -ENODEV;
1340         }
1341
1342         if (ps->dev->state != USB_STATE_CONFIGURED)
1343                 retval = -EHOSTUNREACH;
1344         else if (!(intf = usb_ifnum_to_if (ps->dev, ctl->ifno)))
1345                retval = -EINVAL;
1346         else switch (ctl->ioctl_code) {
1347
1348         /* disconnect kernel driver from interface */
1349         case USBDEVFS_DISCONNECT:
1350
1351                 down_write(&usb_bus_type.subsys.rwsem);
1352                 if (intf->dev.driver) {
1353                         driver = to_usb_driver(intf->dev.driver);
1354                         dev_dbg (&intf->dev, "disconnect by usbfs\n");
1355                         usb_driver_release_interface(driver, intf);
1356                 } else
1357                         retval = -ENODATA;
1358                 up_write(&usb_bus_type.subsys.rwsem);
1359                 break;
1360
1361         /* let kernel drivers try to (re)bind to the interface */
1362         case USBDEVFS_CONNECT:
1363                 usb_unlock_device(ps->dev);
1364                 retval = bus_rescan_devices(intf->dev.bus);
1365                 usb_lock_device(ps->dev);
1366                 break;
1367
1368         /* talk directly to the interface's driver */
1369         default:
1370                 down_read(&usb_bus_type.subsys.rwsem);
1371                 if (intf->dev.driver)
1372                         driver = to_usb_driver(intf->dev.driver);
1373                 if (driver == NULL || driver->ioctl == NULL) {
1374                         retval = -ENOTTY;
1375                 } else {
1376                         retval = driver->ioctl (intf, ctl->ioctl_code, buf);
1377                         if (retval == -ENOIOCTLCMD)
1378                                 retval = -ENOTTY;
1379                 }
1380                 up_read(&usb_bus_type.subsys.rwsem);
1381         }
1382
1383         /* cleanup and return */
1384         if (retval >= 0
1385                         && (_IOC_DIR (ctl->ioctl_code) & _IOC_READ) != 0
1386                         && size > 0
1387                         && copy_to_user (ctl->data, buf, size) != 0)
1388                 retval = -EFAULT;
1389
1390         kfree(buf);
1391         return retval;
1392 }
1393
1394 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1395 {
1396         struct usbdevfs_ioctl   ctrl;
1397
1398         if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
1399                 return -EFAULT;
1400         return proc_ioctl(ps, &ctrl);
1401 }
1402
1403 #ifdef CONFIG_COMPAT
1404 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1405 {
1406         struct usbdevfs_ioctl32 __user *uioc;
1407         struct usbdevfs_ioctl ctrl;
1408         u32 udata;
1409
1410         uioc = compat_ptr((long)arg);
1411         if (get_user(ctrl.ifno, &uioc->ifno) ||
1412             get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1413             __get_user(udata, &uioc->data))
1414                 return -EFAULT;
1415         ctrl.data = compat_ptr(udata);
1416
1417         return proc_ioctl(ps, &ctrl);
1418 }
1419 #endif
1420
1421 /*
1422  * NOTE:  All requests here that have interface numbers as parameters
1423  * are assuming that somehow the configuration has been prevented from
1424  * changing.  But there's no mechanism to ensure that...
1425  */
1426 static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1427 {
1428         struct dev_state *ps = file->private_data;
1429         struct usb_device *dev = ps->dev;
1430         void __user *p = (void __user *)arg;
1431         int ret = -ENOTTY;
1432
1433         if (!(file->f_mode & FMODE_WRITE))
1434                 return -EPERM;
1435         usb_lock_device(dev);
1436         if (!connected(ps)) {
1437                 usb_unlock_device(dev);
1438                 return -ENODEV;
1439         }
1440
1441         switch (cmd) {
1442         case USBDEVFS_CONTROL:
1443                 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
1444                 ret = proc_control(ps, p);
1445                 if (ret >= 0)
1446                         inode->i_mtime = CURRENT_TIME;
1447                 break;
1448
1449         case USBDEVFS_BULK:
1450                 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
1451                 ret = proc_bulk(ps, p);
1452                 if (ret >= 0)
1453                         inode->i_mtime = CURRENT_TIME;
1454                 break;
1455
1456         case USBDEVFS_RESETEP:
1457                 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
1458                 ret = proc_resetep(ps, p);
1459                 if (ret >= 0)
1460                         inode->i_mtime = CURRENT_TIME;
1461                 break;
1462
1463         case USBDEVFS_RESET:
1464                 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
1465                 ret = proc_resetdevice(ps);
1466                 break;
1467
1468         case USBDEVFS_CLEAR_HALT:
1469                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
1470                 ret = proc_clearhalt(ps, p);
1471                 if (ret >= 0)
1472                         inode->i_mtime = CURRENT_TIME;
1473                 break;
1474
1475         case USBDEVFS_GETDRIVER:
1476                 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
1477                 ret = proc_getdriver(ps, p);
1478                 break;
1479
1480         case USBDEVFS_CONNECTINFO:
1481                 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
1482                 ret = proc_connectinfo(ps, p);
1483                 break;
1484
1485         case USBDEVFS_SETINTERFACE:
1486                 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
1487                 ret = proc_setintf(ps, p);
1488                 break;
1489
1490         case USBDEVFS_SETCONFIGURATION:
1491                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
1492                 ret = proc_setconfig(ps, p);
1493                 break;
1494
1495         case USBDEVFS_SUBMITURB:
1496                 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
1497                 ret = proc_submiturb(ps, p);
1498                 if (ret >= 0)
1499                         inode->i_mtime = CURRENT_TIME;
1500                 break;
1501
1502 #ifdef CONFIG_COMPAT
1503
1504         case USBDEVFS_SUBMITURB32:
1505                 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
1506                 ret = proc_submiturb_compat(ps, p);
1507                 if (ret >= 0)
1508                         inode->i_mtime = CURRENT_TIME;
1509                 break;
1510
1511         case USBDEVFS_REAPURB32:
1512                 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
1513                 ret = proc_reapurb_compat(ps, p);
1514                 break;
1515
1516         case USBDEVFS_REAPURBNDELAY32:
1517                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
1518                 ret = proc_reapurbnonblock_compat(ps, p);
1519                 break;
1520
1521         case USBDEVFS_IOCTL32:
1522                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1523                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1524                 break;
1525 #endif
1526
1527         case USBDEVFS_DISCARDURB:
1528                 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
1529                 ret = proc_unlinkurb(ps, p);
1530                 break;
1531
1532         case USBDEVFS_REAPURB:
1533                 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
1534                 ret = proc_reapurb(ps, p);
1535                 break;
1536
1537         case USBDEVFS_REAPURBNDELAY:
1538                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
1539                 ret = proc_reapurbnonblock(ps, p);
1540                 break;
1541
1542         case USBDEVFS_DISCSIGNAL:
1543                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
1544                 ret = proc_disconnectsignal(ps, p);
1545                 break;
1546
1547         case USBDEVFS_CLAIMINTERFACE:
1548                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
1549                 ret = proc_claiminterface(ps, p);
1550                 break;
1551
1552         case USBDEVFS_RELEASEINTERFACE:
1553                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
1554                 ret = proc_releaseinterface(ps, p);
1555                 break;
1556
1557         case USBDEVFS_IOCTL:
1558                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1559                 ret = proc_ioctl_default(ps, p);
1560                 break;
1561         }
1562         usb_unlock_device(dev);
1563         if (ret >= 0)
1564                 inode->i_atime = CURRENT_TIME;
1565         return ret;
1566 }
1567
1568 /* No kernel lock - fine */
1569 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
1570 {
1571         struct dev_state *ps = file->private_data;
1572         unsigned int mask = 0;
1573
1574         poll_wait(file, &ps->wait, wait);
1575         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1576                 mask |= POLLOUT | POLLWRNORM;
1577         if (!connected(ps))
1578                 mask |= POLLERR | POLLHUP;
1579         return mask;
1580 }
1581
1582 const struct file_operations usbfs_device_file_operations = {
1583         .llseek =       usbdev_lseek,
1584         .read =         usbdev_read,
1585         .poll =         usbdev_poll,
1586         .ioctl =        usbdev_ioctl,
1587         .open =         usbdev_open,
1588         .release =      usbdev_release,
1589 };
1590
1591 static int usbdev_add(struct usb_device *dev)
1592 {
1593         int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1594
1595         dev->class_dev = class_device_create(usb_device_class, NULL,
1596                                 MKDEV(USB_DEVICE_MAJOR, minor), &dev->dev,
1597                                 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1598         if (IS_ERR(dev->class_dev))
1599                 return PTR_ERR(dev->class_dev);
1600
1601         dev->class_dev->class_data = dev;
1602         return 0;
1603 }
1604
1605 static void usbdev_remove(struct usb_device *dev)
1606 {
1607         class_device_unregister(dev->class_dev);
1608 }
1609
1610 static int usbdev_notify(struct notifier_block *self, unsigned long action,
1611                          void *dev)
1612 {
1613         switch (action) {
1614         case USB_DEVICE_ADD:
1615                 if (usbdev_add(dev))
1616                         return NOTIFY_BAD;
1617                 break;
1618         case USB_DEVICE_REMOVE:
1619                 usbdev_remove(dev);
1620                 break;
1621         }
1622         return NOTIFY_OK;
1623 }
1624
1625 static struct notifier_block usbdev_nb = {
1626         .notifier_call =        usbdev_notify,
1627 };
1628
1629 static struct cdev usb_device_cdev = {
1630         .kobj   = {.name = "usb_device", },
1631         .owner  = THIS_MODULE,
1632 };
1633
1634 int __init usbdev_init(void)
1635 {
1636         int retval;
1637
1638         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1639                         "usb_device");
1640         if (retval) {
1641                 err("unable to register minors for usb_device");
1642                 goto out;
1643         }
1644         cdev_init(&usb_device_cdev, &usbfs_device_file_operations);
1645         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1646         if (retval) {
1647                 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1648                 goto error_cdev;
1649         }
1650         usb_device_class = class_create(THIS_MODULE, "usb_device");
1651         if (IS_ERR(usb_device_class)) {
1652                 err("unable to register usb_device class");
1653                 retval = PTR_ERR(usb_device_class);
1654                 goto error_class;
1655         }
1656
1657         usb_register_notify(&usbdev_nb);
1658
1659 out:
1660         return retval;
1661
1662 error_class:
1663         usb_device_class = NULL;
1664         cdev_del(&usb_device_cdev);
1665
1666 error_cdev:
1667         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1668         goto out;
1669 }
1670
1671 void usbdev_cleanup(void)
1672 {
1673         usb_unregister_notify(&usbdev_nb);
1674         class_destroy(usb_device_class);
1675         cdev_del(&usb_device_cdev);
1676         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1677 }
1678