SAFE public projects git trees. - safe/jmp/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  *  This file implements the usbfs/x/y files, where
  23  *  x is the bus number and y the device number.
  24  *
  25  *  It allows user space programs/"drivers" to communicate directly
  26  *  with USB devices without intervening kernel driver.
  27  *
  28  *  Revision history
  29  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  30  *    04.01.2000   0.2   Turned into its own filesystem
  31  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  32  *                       (CAN-2005-3055)
  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 <linux/notifier.h>
  48 #include <linux/security.h>
  49 #include <asm/uaccess.h>
  50 #include <asm/byteorder.h>
  51 #include <linux/moduleparam.h>
  52
  53 #include "hcd.h"        /* for usbcore internals */
  54 #include "usb.h"
  55 #include "hub.h"
  56
  57 #define USB_MAXBUS                      64
  58 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
  59
  60 /* Mutual exclusion for removal, open, and release */
  61 DEFINE_MUTEX(usbfs_mutex);
  62
  63 struct dev_state {
  64         struct list_head list;      /* state list */
  65         struct usb_device *dev;
  66         struct file *file;
  67         spinlock_t lock;            /* protects the async urb lists */
  68         struct list_head async_pending;
  69         struct list_head async_completed;
  70         wait_queue_head_t wait;     /* wake up if a request completed */
  71         unsigned int discsignr;
  72         struct pid *disc_pid;
  73         uid_t disc_uid, disc_euid;
  74         void __user *disccontext;
  75         unsigned long ifclaimed;
  76         u32 secid;
  77 };
  78
  79 struct async {
  80         struct list_head asynclist;
  81         struct dev_state *ps;
  82         struct pid *pid;
  83         uid_t uid, euid;
  84         unsigned int signr;
  85         unsigned int ifnum;
  86         void __user *userbuffer;
  87         void __user *userurb;
  88         struct urb *urb;
  89         int status;
  90         u32 secid;
  91 };
  92
  93 static int usbfs_snoop;
  94 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  95 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
  96
  97 #define snoop(dev, format, arg...)                              \
  98         do {                                                    \
  99                 if (usbfs_snoop)                                \
 100                         dev_info(dev , format , ## arg);        \
 101         } while (0)
 102
 103 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 104
 105
 106 #define MAX_USBFS_BUFFER_SIZE   16384
 107
 108 static int connected(struct dev_state *ps)
 109 {
 110         return (!list_empty(&ps->list) &&
 111                         ps->dev->state != USB_STATE_NOTATTACHED);
 112 }
 113
 114 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
 115 {
 116         loff_t ret;
 117
 118         lock_kernel();
 119
 120         switch (orig) {
 121         case 0:
 122                 file->f_pos = offset;
 123                 ret = file->f_pos;
 124                 break;
 125         case 1:
 126                 file->f_pos += offset;
 127                 ret = file->f_pos;
 128                 break;
 129         case 2:
 130         default:
 131                 ret = -EINVAL;
 132         }
 133
 134         unlock_kernel();
 135         return ret;
 136 }
 137
 138 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 139                            loff_t *ppos)
 140 {
 141         struct dev_state *ps = file->private_data;
 142         struct usb_device *dev = ps->dev;
 143         ssize_t ret = 0;
 144         unsigned len;
 145         loff_t pos;
 146         int i;
 147
 148         pos = *ppos;
 149         usb_lock_device(dev);
 150         if (!connected(ps)) {
 151                 ret = -ENODEV;
 152                 goto err;
 153         } else if (pos < 0) {
 154                 ret = -EINVAL;
 155                 goto err;
 156         }
 157
 158         if (pos < sizeof(struct usb_device_descriptor)) {
 159                 /* 18 bytes - fits on the stack */
 160                 struct usb_device_descriptor temp_desc;
 161
 162                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 163                 le16_to_cpus(&temp_desc.bcdUSB);
 164                 le16_to_cpus(&temp_desc.idVendor);
 165                 le16_to_cpus(&temp_desc.idProduct);
 166                 le16_to_cpus(&temp_desc.bcdDevice);
 167
 168                 len = sizeof(struct usb_device_descriptor) - pos;
 169                 if (len > nbytes)
 170                         len = nbytes;
 171                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 172                         ret = -EFAULT;
 173                         goto err;
 174                 }
 175
 176                 *ppos += len;
 177                 buf += len;
 178                 nbytes -= len;
 179                 ret += len;
 180         }
 181
 182         pos = sizeof(struct usb_device_descriptor);
 183         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 184                 struct usb_config_descriptor *config =
 185                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 186                 unsigned int length = le16_to_cpu(config->wTotalLength);
 187
 188                 if (*ppos < pos + length) {
 189
 190                         /* The descriptor may claim to be longer than it
 191                          * really is.  Here is the actual allocated length. */
 192                         unsigned alloclen =
 193                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 194
 195                         len = length - (*ppos - pos);
 196                         if (len > nbytes)
 197                                 len = nbytes;
 198
 199                         /* Simply don't write (skip over) unallocated parts */
 200                         if (alloclen > (*ppos - pos)) {
 201                                 alloclen -= (*ppos - pos);
 202                                 if (copy_to_user(buf,
 203                                     dev->rawdescriptors[i] + (*ppos - pos),
 204                                     min(len, alloclen))) {
 205                                         ret = -EFAULT;
 206                                         goto err;
 207                                 }
 208                         }
 209
 210                         *ppos += len;
 211                         buf += len;
 212                         nbytes -= len;
 213                         ret += len;
 214                 }
 215
 216                 pos += length;
 217         }
 218
 219 err:
 220         usb_unlock_device(dev);
 221         return ret;
 222 }
 223
 224 /*
 225  * async list handling
 226  */
 227
 228 static struct async *alloc_async(unsigned int numisoframes)
 229 {
 230         struct async *as;
 231
 232         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 233         if (!as)
 234                 return NULL;
 235         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 236         if (!as->urb) {
 237                 kfree(as);
 238                 return NULL;
 239         }
 240         return as;
 241 }
 242
 243 static void free_async(struct async *as)
 244 {
 245         put_pid(as->pid);
 246         kfree(as->urb->transfer_buffer);
 247         kfree(as->urb->setup_packet);
 248         usb_free_urb(as->urb);
 249         kfree(as);
 250 }
 251
 252 static void async_newpending(struct async *as)
 253 {
 254         struct dev_state *ps = as->ps;
 255         unsigned long flags;
 256
 257         spin_lock_irqsave(&ps->lock, flags);
 258         list_add_tail(&as->asynclist, &ps->async_pending);
 259         spin_unlock_irqrestore(&ps->lock, flags);
 260 }
 261
 262 static void async_removepending(struct async *as)
 263 {
 264         struct dev_state *ps = as->ps;
 265         unsigned long flags;
 266
 267         spin_lock_irqsave(&ps->lock, flags);
 268         list_del_init(&as->asynclist);
 269         spin_unlock_irqrestore(&ps->lock, flags);
 270 }
 271
 272 static struct async *async_getcompleted(struct dev_state *ps)
 273 {
 274         unsigned long flags;
 275         struct async *as = NULL;
 276
 277         spin_lock_irqsave(&ps->lock, flags);
 278         if (!list_empty(&ps->async_completed)) {
 279                 as = list_entry(ps->async_completed.next, struct async,
 280                                 asynclist);
 281                 list_del_init(&as->asynclist);
 282         }
 283         spin_unlock_irqrestore(&ps->lock, flags);
 284         return as;
 285 }
 286
 287 static struct async *async_getpending(struct dev_state *ps,
 288                                              void __user *userurb)
 289 {
 290         unsigned long flags;
 291         struct async *as;
 292
 293         spin_lock_irqsave(&ps->lock, flags);
 294         list_for_each_entry(as, &ps->async_pending, asynclist)
 295                 if (as->userurb == userurb) {
 296                         list_del_init(&as->asynclist);
 297                         spin_unlock_irqrestore(&ps->lock, flags);
 298                         return as;
 299                 }
 300         spin_unlock_irqrestore(&ps->lock, flags);
 301         return NULL;
 302 }
 303
 304 static void snoop_urb(struct urb *urb, void __user *userurb)
 305 {
 306         unsigned j;
 307         unsigned char *data = urb->transfer_buffer;
 308
 309         if (!usbfs_snoop)
 310                 return;
 311
 312         dev_info(&urb->dev->dev, "direction=%s\n",
 313                         usb_urb_dir_in(urb) ? "IN" : "OUT");
 314         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
 315         dev_info(&urb->dev->dev, "transfer_buffer_length=%u\n",
 316                  urb->transfer_buffer_length);
 317         dev_info(&urb->dev->dev, "actual_length=%u\n", urb->actual_length);
 318         dev_info(&urb->dev->dev, "data: ");
 319         for (j = 0; j < urb->transfer_buffer_length; ++j)
 320                 printk("%02x ", data[j]);
 321         printk("\n");
 322 }
 323
 324 static void async_completed(struct urb *urb)
 325 {
 326         struct async *as = urb->context;
 327         struct dev_state *ps = as->ps;
 328         struct siginfo sinfo;
 329         struct pid *pid = NULL;
 330         uid_t uid = 0;
 331         uid_t euid = 0;
 332         u32 secid = 0;
 333         int signr;
 334
 335         spin_lock(&ps->lock);
 336         list_move_tail(&as->asynclist, &ps->async_completed);
 337         as->status = urb->status;
 338         signr = as->signr;
 339         if (signr) {
 340                 sinfo.si_signo = as->signr;
 341                 sinfo.si_errno = as->status;
 342                 sinfo.si_code = SI_ASYNCIO;
 343                 sinfo.si_addr = as->userurb;
 344                 pid = as->pid;
 345                 uid = as->uid;
 346                 euid = as->euid;
 347                 secid = as->secid;
 348         }
 349         snoop(&urb->dev->dev, "urb complete\n");
 350         snoop_urb(urb, as->userurb);
 351         spin_unlock(&ps->lock);
 352
 353         if (signr)
 354                 kill_pid_info_as_uid(sinfo.si_signo, &sinfo, pid, uid,
 355                                       euid, secid);
 356
 357         wake_up(&ps->wait);
 358 }
 359
 360 static void destroy_async(struct dev_state *ps, struct list_head *list)
 361 {
 362         struct async *as;
 363         unsigned long flags;
 364
 365         spin_lock_irqsave(&ps->lock, flags);
 366         while (!list_empty(list)) {
 367                 as = list_entry(list->next, struct async, asynclist);
 368                 list_del_init(&as->asynclist);
 369
 370                 /* drop the spinlock so the completion handler can run */
 371                 spin_unlock_irqrestore(&ps->lock, flags);
 372                 usb_kill_urb(as->urb);
 373                 spin_lock_irqsave(&ps->lock, flags);
 374         }
 375         spin_unlock_irqrestore(&ps->lock, flags);
 376 }
 377
 378 static void destroy_async_on_interface(struct dev_state *ps,
 379                                        unsigned int ifnum)
 380 {
 381         struct list_head *p, *q, hitlist;
 382         unsigned long flags;
 383
 384         INIT_LIST_HEAD(&hitlist);
 385         spin_lock_irqsave(&ps->lock, flags);
 386         list_for_each_safe(p, q, &ps->async_pending)
 387                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 388                         list_move_tail(p, &hitlist);
 389         spin_unlock_irqrestore(&ps->lock, flags);
 390         destroy_async(ps, &hitlist);
 391 }
 392
 393 static void destroy_all_async(struct dev_state *ps)
 394 {
 395         destroy_async(ps, &ps->async_pending);
 396 }
 397
 398 /*
 399  * interface claims are made only at the request of user level code,
 400  * which can also release them (explicitly or by closing files).
 401  * they're also undone when devices disconnect.
 402  */
 403
 404 static int driver_probe(struct usb_interface *intf,
 405                         const struct usb_device_id *id)
 406 {
 407         return -ENODEV;
 408 }
 409
 410 static void driver_disconnect(struct usb_interface *intf)
 411 {
 412         struct dev_state *ps = usb_get_intfdata(intf);
 413         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 414
 415         if (!ps)
 416                 return;
 417
 418         /* NOTE:  this relies on usbcore having canceled and completed
 419          * all pending I/O requests; 2.6 does that.
 420          */
 421
 422         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 423                 clear_bit(ifnum, &ps->ifclaimed);
 424         else
 425                 dev_warn(&intf->dev, "interface number %u out of range\n",
 426                          ifnum);
 427
 428         usb_set_intfdata(intf, NULL);
 429
 430         /* force async requests to complete */
 431         destroy_async_on_interface(ps, ifnum);
 432 }
 433
 434 /* The following routines are merely placeholders.  There is no way
 435  * to inform a user task about suspend or resumes.
 436  */
 437 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 438 {
 439         return 0;
 440 }
 441
 442 static int driver_resume(struct usb_interface *intf)
 443 {
 444         return 0;
 445 }
 446
 447 struct usb_driver usbfs_driver = {
 448         .name =         "usbfs",
 449         .probe =        driver_probe,
 450         .disconnect =   driver_disconnect,
 451         .suspend =      driver_suspend,
 452         .resume =       driver_resume,
 453 };
 454
 455 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 456 {
 457         struct usb_device *dev = ps->dev;
 458         struct usb_interface *intf;
 459         int err;
 460
 461         if (ifnum >= 8*sizeof(ps->ifclaimed))
 462                 return -EINVAL;
 463         /* already claimed */
 464         if (test_bit(ifnum, &ps->ifclaimed))
 465                 return 0;
 466
 467         intf = usb_ifnum_to_if(dev, ifnum);
 468         if (!intf)
 469                 err = -ENOENT;
 470         else
 471                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 472         if (err == 0)
 473                 set_bit(ifnum, &ps->ifclaimed);
 474         return err;
 475 }
 476
 477 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 478 {
 479         struct usb_device *dev;
 480         struct usb_interface *intf;
 481         int err;
 482
 483         err = -EINVAL;
 484         if (ifnum >= 8*sizeof(ps->ifclaimed))
 485                 return err;
 486         dev = ps->dev;
 487         intf = usb_ifnum_to_if(dev, ifnum);
 488         if (!intf)
 489                 err = -ENOENT;
 490         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 491                 usb_driver_release_interface(&usbfs_driver, intf);
 492                 err = 0;
 493         }
 494         return err;
 495 }
 496
 497 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 498 {
 499         if (ps->dev->state != USB_STATE_CONFIGURED)
 500                 return -EHOSTUNREACH;
 501         if (ifnum >= 8*sizeof(ps->ifclaimed))
 502                 return -EINVAL;
 503         if (test_bit(ifnum, &ps->ifclaimed))
 504                 return 0;
 505         /* if not yet claimed, claim it for the driver */
 506         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 507                  "interface %u before use\n", task_pid_nr(current),
 508                  current->comm, ifnum);
 509         return claimintf(ps, ifnum);
 510 }
 511
 512 static int findintfep(struct usb_device *dev, unsigned int ep)
 513 {
 514         unsigned int i, j, e;
 515         struct usb_interface *intf;
 516         struct usb_host_interface *alts;
 517         struct usb_endpoint_descriptor *endpt;
 518
 519         if (ep & ~(USB_DIR_IN|0xf))
 520                 return -EINVAL;
 521         if (!dev->actconfig)
 522                 return -ESRCH;
 523         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 524                 intf = dev->actconfig->interface[i];
 525                 for (j = 0; j < intf->num_altsetting; j++) {
 526                         alts = &intf->altsetting[j];
 527                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 528                                 endpt = &alts->endpoint[e].desc;
 529                                 if (endpt->bEndpointAddress == ep)
 530                                         return alts->desc.bInterfaceNumber;
 531                         }
 532                 }
 533         }
 534         return -ENOENT;
 535 }
 536
 537 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
 538                            unsigned int index)
 539 {
 540         int ret = 0;
 541
 542         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 543          && ps->dev->state != USB_STATE_ADDRESS
 544          && ps->dev->state != USB_STATE_CONFIGURED)
 545                 return -EHOSTUNREACH;
 546         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 547                 return 0;
 548
 549         index &= 0xff;
 550         switch (requesttype & USB_RECIP_MASK) {
 551         case USB_RECIP_ENDPOINT:
 552                 ret = findintfep(ps->dev, index);
 553                 if (ret >= 0)
 554                         ret = checkintf(ps, ret);
 555                 break;
 556
 557         case USB_RECIP_INTERFACE:
 558                 ret = checkintf(ps, index);
 559                 break;
 560         }
 561         return ret;
 562 }
 563
 564 static int match_devt(struct device *dev, void *data)
 565 {
 566         return dev->devt == (dev_t) (unsigned long) data;
 567 }
 568
 569 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 570 {
 571         struct device *dev;
 572
 573         dev = bus_find_device(&usb_bus_type, NULL,
 574                               (void *) (unsigned long) devt, match_devt);
 575         if (!dev)
 576                 return NULL;
 577         return container_of(dev, struct usb_device, dev);
 578 }
 579
 580 /*
 581  * file operations
 582  */
 583 static int usbdev_open(struct inode *inode, struct file *file)
 584 {
 585         struct usb_device *dev = NULL;
 586         struct dev_state *ps;
 587         const struct cred *cred = current_cred();
 588         int ret;
 589
 590         lock_kernel();
 591         /* Protect against simultaneous removal or release */
 592         mutex_lock(&usbfs_mutex);
 593
 594         ret = -ENOMEM;
 595         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
 596         if (!ps)
 597                 goto out;
 598
 599         ret = -ENODEV;
 600
 601         /* usbdev device-node */
 602         if (imajor(inode) == USB_DEVICE_MAJOR)
 603                 dev = usbdev_lookup_by_devt(inode->i_rdev);
 604 #ifdef CONFIG_USB_DEVICEFS
 605         /* procfs file */
 606         if (!dev) {
 607                 dev = inode->i_private;
 608                 if (dev && dev->usbfs_dentry &&
 609                                         dev->usbfs_dentry->d_inode == inode)
 610                         usb_get_dev(dev);
 611                 else
 612                         dev = NULL;
 613         }
 614 #endif
 615         if (!dev || dev->state == USB_STATE_NOTATTACHED)
 616                 goto out;
 617         ret = usb_autoresume_device(dev);
 618         if (ret)
 619                 goto out;
 620
 621         ret = 0;
 622         ps->dev = dev;
 623         ps->file = file;
 624         spin_lock_init(&ps->lock);
 625         INIT_LIST_HEAD(&ps->list);
 626         INIT_LIST_HEAD(&ps->async_pending);
 627         INIT_LIST_HEAD(&ps->async_completed);
 628         init_waitqueue_head(&ps->wait);
 629         ps->discsignr = 0;
 630         ps->disc_pid = get_pid(task_pid(current));
 631         ps->disc_uid = cred->uid;
 632         ps->disc_euid = cred->euid;
 633         ps->disccontext = NULL;
 634         ps->ifclaimed = 0;
 635         security_task_getsecid(current, &ps->secid);
 636         smp_wmb();
 637         list_add_tail(&ps->list, &dev->filelist);
 638         file->private_data = ps;
 639         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
 640                         current->comm);
 641  out:
 642         if (ret) {
 643                 kfree(ps);
 644                 usb_put_dev(dev);
 645         }
 646         mutex_unlock(&usbfs_mutex);
 647         unlock_kernel();
 648         return ret;
 649 }
 650
 651 static int usbdev_release(struct inode *inode, struct file *file)
 652 {
 653         struct dev_state *ps = file->private_data;
 654         struct usb_device *dev = ps->dev;
 655         unsigned int ifnum;
 656         struct async *as;
 657
 658         usb_lock_device(dev);
 659         usb_hub_release_all_ports(dev, ps);
 660
 661         /* Protect against simultaneous open */
 662         mutex_lock(&usbfs_mutex);
 663         list_del_init(&ps->list);
 664         mutex_unlock(&usbfs_mutex);
 665
 666         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 667                         ifnum++) {
 668                 if (test_bit(ifnum, &ps->ifclaimed))
 669                         releaseintf(ps, ifnum);
 670         }
 671         destroy_all_async(ps);
 672         usb_autosuspend_device(dev);
 673         usb_unlock_device(dev);
 674         usb_put_dev(dev);
 675         put_pid(ps->disc_pid);
 676
 677         as = async_getcompleted(ps);
 678         while (as) {
 679                 free_async(as);
 680                 as = async_getcompleted(ps);
 681         }
 682         kfree(ps);
 683         return 0;
 684 }
 685
 686 static int proc_control(struct dev_state *ps, void __user *arg)
 687 {
 688         struct usb_device *dev = ps->dev;
 689         struct usbdevfs_ctrltransfer ctrl;
 690         unsigned int tmo;
 691         unsigned char *tbuf;
 692         unsigned wLength;
 693         int i, j, ret;
 694
 695         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 696                 return -EFAULT;
 697         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
 698         if (ret)
 699                 return ret;
 700         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
 701         if (wLength > PAGE_SIZE)
 702                 return -EINVAL;
 703         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
 704         if (!tbuf)
 705                 return -ENOMEM;
 706         tmo = ctrl.timeout;
 707         if (ctrl.bRequestType & 0x80) {
 708                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
 709                                                ctrl.wLength)) {
 710                         free_page((unsigned long)tbuf);
 711                         return -EINVAL;
 712                 }
 713                 snoop(&dev->dev, "control read: bRequest=%02x "
 714                                 "bRrequestType=%02x wValue=%04x "
 715                                 "wIndex=%04x wLength=%04x\n",
 716                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 717                                 ctrl.wIndex, ctrl.wLength);
 718
 719                 usb_unlock_device(dev);
 720                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest,
 721                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 722                                     tbuf, ctrl.wLength, tmo);
 723                 usb_lock_device(dev);
 724                 if ((i > 0) && ctrl.wLength) {
 725                         if (usbfs_snoop) {
 726                                 dev_info(&dev->dev, "control read: data ");
 727                                 for (j = 0; j < i; ++j)
 728                                         printk("%02x ", (u8)(tbuf)[j]);
 729                                 printk("\n");
 730                         }
 731                         if (copy_to_user(ctrl.data, tbuf, i)) {
 732                                 free_page((unsigned long)tbuf);
 733                                 return -EFAULT;
 734                         }
 735                 }
 736         } else {
 737                 if (ctrl.wLength) {
 738                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 739                                 free_page((unsigned long)tbuf);
 740                                 return -EFAULT;
 741                         }
 742                 }
 743                 snoop(&dev->dev, "control write: bRequest=%02x "
 744                                 "bRrequestType=%02x wValue=%04x "
 745                                 "wIndex=%04x wLength=%04x\n",
 746                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 747                                 ctrl.wIndex, ctrl.wLength);
 748                 if (usbfs_snoop) {
 749                         dev_info(&dev->dev, "control write: data: ");
 750                         for (j = 0; j < ctrl.wLength; ++j)
 751                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 752                         printk("\n");
 753                 }
 754                 usb_unlock_device(dev);
 755                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
 756                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 757                                     tbuf, ctrl.wLength, tmo);
 758                 usb_lock_device(dev);
 759         }
 760         free_page((unsigned long)tbuf);
 761         if (i < 0 && i != -EPIPE) {
 762                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 763                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 764                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 765                            ctrl.wLength, i);
 766         }
 767         return i;
 768 }
 769
 770 static int proc_bulk(struct dev_state *ps, void __user *arg)
 771 {
 772         struct usb_device *dev = ps->dev;
 773         struct usbdevfs_bulktransfer bulk;
 774         unsigned int tmo, len1, pipe;
 775         int len2;
 776         unsigned char *tbuf;
 777         int i, j, ret;
 778
 779         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 780                 return -EFAULT;
 781         ret = findintfep(ps->dev, bulk.ep);
 782         if (ret < 0)
 783                 return ret;
 784         ret = checkintf(ps, ret);
 785         if (ret)
 786                 return ret;
 787         if (bulk.ep & USB_DIR_IN)
 788                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 789         else
 790                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 791         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 792                 return -EINVAL;
 793         len1 = bulk.len;
 794         if (len1 > MAX_USBFS_BUFFER_SIZE)
 795                 return -EINVAL;
 796         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 797                 return -ENOMEM;
 798         tmo = bulk.timeout;
 799         if (bulk.ep & 0x80) {
 800                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 801                         kfree(tbuf);
 802                         return -EINVAL;
 803                 }
 804                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
 805                         bulk.len, bulk.timeout);
 806                 usb_unlock_device(dev);
 807                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 808                 usb_lock_device(dev);
 809                 if (!i && len2) {
 810                         if (usbfs_snoop) {
 811                                 dev_info(&dev->dev, "bulk read: data ");
 812                                 for (j = 0; j < len2; ++j)
 813                                         printk("%02x ", (u8)(tbuf)[j]);
 814                                 printk("\n");
 815                         }
 816                         if (copy_to_user(bulk.data, tbuf, len2)) {
 817                                 kfree(tbuf);
 818                                 return -EFAULT;
 819                         }
 820                 }
 821         } else {
 822                 if (len1) {
 823                         if (copy_from_user(tbuf, bulk.data, len1)) {
 824                                 kfree(tbuf);
 825                                 return -EFAULT;
 826                         }
 827                 }
 828                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
 829                         bulk.len, bulk.timeout);
 830                 if (usbfs_snoop) {
 831                         dev_info(&dev->dev, "bulk write: data: ");
 832                         for (j = 0; j < len1; ++j)
 833                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 834                         printk("\n");
 835                 }
 836                 usb_unlock_device(dev);
 837                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 838                 usb_lock_device(dev);
 839         }
 840         kfree(tbuf);
 841         if (i < 0)
 842                 return i;
 843         return len2;
 844 }
 845
 846 static int proc_resetep(struct dev_state *ps, void __user *arg)
 847 {
 848         unsigned int ep;
 849         int ret;
 850
 851         if (get_user(ep, (unsigned int __user *)arg))
 852                 return -EFAULT;
 853         ret = findintfep(ps->dev, ep);
 854         if (ret < 0)
 855                 return ret;
 856         ret = checkintf(ps, ret);
 857         if (ret)
 858                 return ret;
 859         usb_reset_endpoint(ps->dev, ep);
 860         return 0;
 861 }
 862
 863 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 864 {
 865         unsigned int ep;
 866         int pipe;
 867         int ret;
 868
 869         if (get_user(ep, (unsigned int __user *)arg))
 870                 return -EFAULT;
 871         ret = findintfep(ps->dev, ep);
 872         if (ret < 0)
 873                 return ret;
 874         ret = checkintf(ps, ret);
 875         if (ret)
 876                 return ret;
 877         if (ep & USB_DIR_IN)
 878                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 879         else
 880                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 881
 882         return usb_clear_halt(ps->dev, pipe);
 883 }
 884
 885 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 886 {
 887         struct usbdevfs_getdriver gd;
 888         struct usb_interface *intf;
 889         int ret;
 890
 891         if (copy_from_user(&gd, arg, sizeof(gd)))
 892                 return -EFAULT;
 893         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 894         if (!intf || !intf->dev.driver)
 895                 ret = -ENODATA;
 896         else {
 897                 strncpy(gd.driver, intf->dev.driver->name,
 898                                 sizeof(gd.driver));
 899                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 900         }
 901         return ret;
 902 }
 903
 904 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 905 {
 906         struct usbdevfs_connectinfo ci;
 907
 908         ci.devnum = ps->dev->devnum;
 909         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 910         if (copy_to_user(arg, &ci, sizeof(ci)))
 911                 return -EFAULT;
 912         return 0;
 913 }
 914
 915 static int proc_resetdevice(struct dev_state *ps)
 916 {
 917         return usb_reset_device(ps->dev);
 918 }
 919
 920 static int proc_setintf(struct dev_state *ps, void __user *arg)
 921 {
 922         struct usbdevfs_setinterface setintf;
 923         int ret;
 924
 925         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 926                 return -EFAULT;
 927         if ((ret = checkintf(ps, setintf.interface)))
 928                 return ret;
 929         return usb_set_interface(ps->dev, setintf.interface,
 930                         setintf.altsetting);
 931 }
 932
 933 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 934 {
 935         int u;
 936         int status = 0;
 937         struct usb_host_config *actconfig;
 938
 939         if (get_user(u, (int __user *)arg))
 940                 return -EFAULT;
 941
 942         actconfig = ps->dev->actconfig;
 943
 944         /* Don't touch the device if any interfaces are claimed.
 945          * It could interfere with other drivers' operations, and if
 946          * an interface is claimed by usbfs it could easily deadlock.
 947          */
 948         if (actconfig) {
 949                 int i;
 950
 951                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 952                         if (usb_interface_claimed(actconfig->interface[i])) {
 953                                 dev_warn(&ps->dev->dev,
 954                                         "usbfs: interface %d claimed by %s "
 955                                         "while '%s' sets config #%d\n",
 956                                         actconfig->interface[i]
 957                                                 ->cur_altsetting
 958                                                 ->desc.bInterfaceNumber,
 959                                         actconfig->interface[i]
 960                                                 ->dev.driver->name,
 961                                         current->comm, u);
 962                                 status = -EBUSY;
 963                                 break;
 964                         }
 965                 }
 966         }
 967
 968         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 969          * so avoid usb_set_configuration()'s kick to sysfs
 970          */
 971         if (status == 0) {
 972                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 973                         status = usb_reset_configuration(ps->dev);
 974                 else
 975                         status = usb_set_configuration(ps->dev, u);
 976         }
 977
 978         return status;
 979 }
 980
 981 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 982                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
 983                         void __user *arg)
 984 {
 985         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 986         struct usb_host_endpoint *ep;
 987         struct async *as;
 988         struct usb_ctrlrequest *dr = NULL;
 989         const struct cred *cred = current_cred();
 990         unsigned int u, totlen, isofrmlen;
 991         int ret, ifnum = -1;
 992         int is_in;
 993
 994         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
 995                                 USBDEVFS_URB_SHORT_NOT_OK |
 996                                 USBDEVFS_URB_NO_FSBR |
 997                                 USBDEVFS_URB_ZERO_PACKET |
 998                                 USBDEVFS_URB_NO_INTERRUPT))
 999                 return -EINVAL;
1000         if (uurb->buffer_length > 0 && !uurb->buffer)
1001                 return -EINVAL;
1002         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1003             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1004                 ifnum = findintfep(ps->dev, uurb->endpoint);
1005                 if (ifnum < 0)
1006                         return ifnum;
1007                 ret = checkintf(ps, ifnum);
1008                 if (ret)
1009                         return ret;
1010         }
1011         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1012                 is_in = 1;
1013                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1014         } else {
1015                 is_in = 0;
1016                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1017         }
1018         if (!ep)
1019                 return -ENOENT;
1020         switch(uurb->type) {
1021         case USBDEVFS_URB_TYPE_CONTROL:
1022                 if (!usb_endpoint_xfer_control(&ep->desc))
1023                         return -EINVAL;
1024                 /* min 8 byte setup packet,
1025                  * max 8 byte setup plus an arbitrary data stage */
1026                 if (uurb->buffer_length < 8 ||
1027                     uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1028                         return -EINVAL;
1029                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1030                 if (!dr)
1031                         return -ENOMEM;
1032                 if (copy_from_user(dr, uurb->buffer, 8)) {
1033                         kfree(dr);
1034                         return -EFAULT;
1035                 }
1036                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1037                         kfree(dr);
1038                         return -EINVAL;
1039                 }
1040                 ret = check_ctrlrecip(ps, dr->bRequestType,
1041                                       le16_to_cpup(&dr->wIndex));
1042                 if (ret) {
1043                         kfree(dr);
1044                         return ret;
1045                 }
1046                 uurb->number_of_packets = 0;
1047                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1048                 uurb->buffer += 8;
1049                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1050                         is_in = 1;
1051                         uurb->endpoint |= USB_DIR_IN;
1052                 } else {
1053                         is_in = 0;
1054                         uurb->endpoint &= ~USB_DIR_IN;
1055                 }
1056                 snoop(&ps->dev->dev, "control urb: bRequest=%02x "
1057                         "bRrequestType=%02x wValue=%04x "
1058                         "wIndex=%04x wLength=%04x\n",
1059                         dr->bRequest, dr->bRequestType,
1060                         __le16_to_cpup(&dr->wValue),
1061                         __le16_to_cpup(&dr->wIndex),
1062                         __le16_to_cpup(&dr->wLength));
1063                 break;
1064
1065         case USBDEVFS_URB_TYPE_BULK:
1066                 switch (usb_endpoint_type(&ep->desc)) {
1067                 case USB_ENDPOINT_XFER_CONTROL:
1068                 case USB_ENDPOINT_XFER_ISOC:
1069                         return -EINVAL;
1070                 /* allow single-shot interrupt transfers, at bogus rates */
1071                 }
1072                 uurb->number_of_packets = 0;
1073                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1074                         return -EINVAL;
1075                 snoop(&ps->dev->dev, "bulk urb\n");
1076                 break;
1077
1078         case USBDEVFS_URB_TYPE_ISO:
1079                 /* arbitrary limit */
1080                 if (uurb->number_of_packets < 1 ||
1081                     uurb->number_of_packets > 128)
1082                         return -EINVAL;
1083                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1084                         return -EINVAL;
1085                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1086                                    uurb->number_of_packets;
1087                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1088                         return -ENOMEM;
1089                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1090                         kfree(isopkt);
1091                         return -EFAULT;
1092                 }
1093                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1094                         /* arbitrary limit,
1095                          * sufficient for USB 2.0 high-bandwidth iso */
1096                         if (isopkt[u].length > 8192) {
1097                                 kfree(isopkt);
1098                                 return -EINVAL;
1099                         }
1100                         totlen += isopkt[u].length;
1101                 }
1102                 if (totlen > 32768) {
1103                         kfree(isopkt);
1104                         return -EINVAL;
1105                 }
1106                 uurb->buffer_length = totlen;
1107                 snoop(&ps->dev->dev, "iso urb\n");
1108                 break;
1109
1110         case USBDEVFS_URB_TYPE_INTERRUPT:
1111                 uurb->number_of_packets = 0;
1112                 if (!usb_endpoint_xfer_int(&ep->desc))
1113                         return -EINVAL;
1114                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1115                         return -EINVAL;
1116                 snoop(&ps->dev->dev, "interrupt urb\n");
1117                 break;
1118
1119         default:
1120                 return -EINVAL;
1121         }
1122         if (uurb->buffer_length > 0 &&
1123                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1124                                 uurb->buffer, uurb->buffer_length)) {
1125                 kfree(isopkt);
1126                 kfree(dr);
1127                 return -EFAULT;
1128         }
1129         as = alloc_async(uurb->number_of_packets);
1130         if (!as) {
1131                 kfree(isopkt);
1132                 kfree(dr);
1133                 return -ENOMEM;
1134         }
1135         if (uurb->buffer_length > 0) {
1136                 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1137                                 GFP_KERNEL);
1138                 if (!as->urb->transfer_buffer) {
1139                         kfree(isopkt);
1140                         kfree(dr);
1141                         free_async(as);
1142                         return -ENOMEM;
1143                 }
1144         }
1145         as->urb->dev = ps->dev;
1146         as->urb->pipe = (uurb->type << 30) |
1147                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1148                         (uurb->endpoint & USB_DIR_IN);
1149
1150         /* This tedious sequence is necessary because the URB_* flags
1151          * are internal to the kernel and subject to change, whereas
1152          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1153          */
1154         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1155         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1156                 u |= URB_ISO_ASAP;
1157         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1158                 u |= URB_SHORT_NOT_OK;
1159         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1160                 u |= URB_NO_FSBR;
1161         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1162                 u |= URB_ZERO_PACKET;
1163         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1164                 u |= URB_NO_INTERRUPT;
1165         as->urb->transfer_flags = u;
1166
1167         as->urb->transfer_buffer_length = uurb->buffer_length;
1168         as->urb->setup_packet = (unsigned char *)dr;
1169         as->urb->start_frame = uurb->start_frame;
1170         as->urb->number_of_packets = uurb->number_of_packets;
1171         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1172                         ps->dev->speed == USB_SPEED_HIGH)
1173                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1174         else
1175                 as->urb->interval = ep->desc.bInterval;
1176         as->urb->context = as;
1177         as->urb->complete = async_completed;
1178         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1179                 as->urb->iso_frame_desc[u].offset = totlen;
1180                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1181                 totlen += isopkt[u].length;
1182         }
1183         kfree(isopkt);
1184         as->ps = ps;
1185         as->userurb = arg;
1186         if (is_in && uurb->buffer_length > 0)
1187                 as->userbuffer = uurb->buffer;
1188         else
1189                 as->userbuffer = NULL;
1190         as->signr = uurb->signr;
1191         as->ifnum = ifnum;
1192         as->pid = get_pid(task_pid(current));
1193         as->uid = cred->uid;
1194         as->euid = cred->euid;
1195         security_task_getsecid(current, &as->secid);
1196         if (!is_in && uurb->buffer_length > 0) {
1197                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1198                                 uurb->buffer_length)) {
1199                         free_async(as);
1200                         return -EFAULT;
1201                 }
1202         }
1203         snoop_urb(as->urb, as->userurb);
1204         async_newpending(as);
1205         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1206                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1207                            "usbfs: usb_submit_urb returned %d\n", ret);
1208                 async_removepending(as);
1209                 free_async(as);
1210                 return ret;
1211         }
1212         return 0;
1213 }
1214
1215 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1216 {
1217         struct usbdevfs_urb uurb;
1218
1219         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1220                 return -EFAULT;
1221
1222         return proc_do_submiturb(ps, &uurb,
1223                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1224                         arg);
1225 }
1226
1227 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1228 {
1229         struct async *as;
1230
1231         as = async_getpending(ps, arg);
1232         if (!as)
1233                 return -EINVAL;
1234         usb_kill_urb(as->urb);
1235         return 0;
1236 }
1237
1238 static int processcompl(struct async *as, void __user * __user *arg)
1239 {
1240         struct urb *urb = as->urb;
1241         struct usbdevfs_urb __user *userurb = as->userurb;
1242         void __user *addr = as->userurb;
1243         unsigned int i;
1244
1245         if (as->userbuffer)
1246                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1247                                  urb->transfer_buffer_length))
1248                         goto err_out;
1249         if (put_user(as->status, &userurb->status))
1250                 goto err_out;
1251         if (put_user(urb->actual_length, &userurb->actual_length))
1252                 goto err_out;
1253         if (put_user(urb->error_count, &userurb->error_count))
1254                 goto err_out;
1255
1256         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1257                 for (i = 0; i < urb->number_of_packets; i++) {
1258                         if (put_user(urb->iso_frame_desc[i].actual_length,
1259                                      &userurb->iso_frame_desc[i].actual_length))
1260                                 goto err_out;
1261                         if (put_user(urb->iso_frame_desc[i].status,
1262                                      &userurb->iso_frame_desc[i].status))
1263                                 goto err_out;
1264                 }
1265         }
1266
1267         free_async(as);
1268
1269         if (put_user(addr, (void __user * __user *)arg))
1270                 return -EFAULT;
1271         return 0;
1272
1273 err_out:
1274         free_async(as);
1275         return -EFAULT;
1276 }
1277
1278 static struct async *reap_as(struct dev_state *ps)
1279 {
1280         DECLARE_WAITQUEUE(wait, current);
1281         struct async *as = NULL;
1282         struct usb_device *dev = ps->dev;
1283
1284         add_wait_queue(&ps->wait, &wait);
1285         for (;;) {
1286                 __set_current_state(TASK_INTERRUPTIBLE);
1287                 as = async_getcompleted(ps);
1288                 if (as)
1289                         break;
1290                 if (signal_pending(current))
1291                         break;
1292                 usb_unlock_device(dev);
1293                 schedule();
1294                 usb_lock_device(dev);
1295         }
1296         remove_wait_queue(&ps->wait, &wait);
1297         set_current_state(TASK_RUNNING);
1298         return as;
1299 }
1300
1301 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1302 {
1303         struct async *as = reap_as(ps);
1304         if (as)
1305                 return processcompl(as, (void __user * __user *)arg);
1306         if (signal_pending(current))
1307                 return -EINTR;
1308         return -EIO;
1309 }
1310
1311 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1312 {
1313         struct async *as;
1314
1315         if (!(as = async_getcompleted(ps)))
1316                 return -EAGAIN;
1317         return processcompl(as, (void __user * __user *)arg);
1318 }
1319
1320 #ifdef CONFIG_COMPAT
1321
1322 static int get_urb32(struct usbdevfs_urb *kurb,
1323                      struct usbdevfs_urb32 __user *uurb)
1324 {
1325         __u32  uptr;
1326         if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1327             __get_user(kurb->type, &uurb->type) ||
1328             __get_user(kurb->endpoint, &uurb->endpoint) ||
1329             __get_user(kurb->status, &uurb->status) ||
1330             __get_user(kurb->flags, &uurb->flags) ||
1331             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1332             __get_user(kurb->actual_length, &uurb->actual_length) ||
1333             __get_user(kurb->start_frame, &uurb->start_frame) ||
1334             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1335             __get_user(kurb->error_count, &uurb->error_count) ||
1336             __get_user(kurb->signr, &uurb->signr))
1337                 return -EFAULT;
1338
1339         if (__get_user(uptr, &uurb->buffer))
1340                 return -EFAULT;
1341         kurb->buffer = compat_ptr(uptr);
1342         if (__get_user(uptr, &uurb->usercontext))
1343                 return -EFAULT;
1344         kurb->usercontext = compat_ptr(uptr);
1345
1346         return 0;
1347 }
1348
1349 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1350 {
1351         struct usbdevfs_urb uurb;
1352
1353         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1354                 return -EFAULT;
1355
1356         return proc_do_submiturb(ps, &uurb,
1357                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1358                         arg);
1359 }
1360
1361 static int processcompl_compat(struct async *as, void __user * __user *arg)
1362 {
1363         struct urb *urb = as->urb;
1364         struct usbdevfs_urb32 __user *userurb = as->userurb;
1365         void __user *addr = as->userurb;
1366         unsigned int i;
1367
1368         if (as->userbuffer)
1369                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1370                                  urb->transfer_buffer_length))
1371                         return -EFAULT;
1372         if (put_user(as->status, &userurb->status))
1373                 return -EFAULT;
1374         if (put_user(urb->actual_length, &userurb->actual_length))
1375                 return -EFAULT;
1376         if (put_user(urb->error_count, &userurb->error_count))
1377                 return -EFAULT;
1378
1379         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1380                 for (i = 0; i < urb->number_of_packets; i++) {
1381                         if (put_user(urb->iso_frame_desc[i].actual_length,
1382                                      &userurb->iso_frame_desc[i].actual_length))
1383                                 return -EFAULT;
1384                         if (put_user(urb->iso_frame_desc[i].status,
1385                                      &userurb->iso_frame_desc[i].status))
1386                                 return -EFAULT;
1387                 }
1388         }
1389
1390         free_async(as);
1391         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1392                 return -EFAULT;
1393         return 0;
1394 }
1395
1396 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1397 {
1398         struct async *as = reap_as(ps);
1399         if (as)
1400                 return processcompl_compat(as, (void __user * __user *)arg);
1401         if (signal_pending(current))
1402                 return -EINTR;
1403         return -EIO;
1404 }
1405
1406 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1407 {
1408         struct async *as;
1409
1410         if (!(as = async_getcompleted(ps)))
1411                 return -EAGAIN;
1412         return processcompl_compat(as, (void __user * __user *)arg);
1413 }
1414
1415 #endif
1416
1417 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1418 {
1419         struct usbdevfs_disconnectsignal ds;
1420
1421         if (copy_from_user(&ds, arg, sizeof(ds)))
1422                 return -EFAULT;
1423         ps->discsignr = ds.signr;
1424         ps->disccontext = ds.context;
1425         return 0;
1426 }
1427
1428 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1429 {
1430         unsigned int ifnum;
1431
1432         if (get_user(ifnum, (unsigned int __user *)arg))
1433                 return -EFAULT;
1434         return claimintf(ps, ifnum);
1435 }
1436
1437 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1438 {
1439         unsigned int ifnum;
1440         int ret;
1441
1442         if (get_user(ifnum, (unsigned int __user *)arg))
1443                 return -EFAULT;
1444         if ((ret = releaseintf(ps, ifnum)) < 0)
1445                 return ret;
1446         destroy_async_on_interface (ps, ifnum);
1447         return 0;
1448 }
1449
1450 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1451 {
1452         int                     size;
1453         void                    *buf = NULL;
1454         int                     retval = 0;
1455         struct usb_interface    *intf = NULL;
1456         struct usb_driver       *driver = NULL;
1457
1458         /* alloc buffer */
1459         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1460                 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1461                         return -ENOMEM;
1462                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1463                         if (copy_from_user(buf, ctl->data, size)) {
1464                                 kfree(buf);
1465                                 return -EFAULT;
1466                         }
1467                 } else {
1468                         memset(buf, 0, size);
1469                 }
1470         }
1471
1472         if (!connected(ps)) {
1473                 kfree(buf);
1474                 return -ENODEV;
1475         }
1476
1477         if (ps->dev->state != USB_STATE_CONFIGURED)
1478                 retval = -EHOSTUNREACH;
1479         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1480                 retval = -EINVAL;
1481         else switch (ctl->ioctl_code) {
1482
1483         /* disconnect kernel driver from interface */
1484         case USBDEVFS_DISCONNECT:
1485                 if (intf->dev.driver) {
1486                         driver = to_usb_driver(intf->dev.driver);
1487                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1488                         usb_driver_release_interface(driver, intf);
1489                 } else
1490                         retval = -ENODATA;
1491                 break;
1492
1493         /* let kernel drivers try to (re)bind to the interface */
1494         case USBDEVFS_CONNECT:
1495                 if (!intf->dev.driver)
1496                         retval = device_attach(&intf->dev);
1497                 else
1498                         retval = -EBUSY;
1499                 break;
1500
1501         /* talk directly to the interface's driver */
1502         default:
1503                 if (intf->dev.driver)
1504                         driver = to_usb_driver(intf->dev.driver);
1505                 if (driver == NULL || driver->ioctl == NULL) {
1506                         retval = -ENOTTY;
1507                 } else {
1508                         retval = driver->ioctl(intf, ctl->ioctl_code, buf);
1509                         if (retval == -ENOIOCTLCMD)
1510                                 retval = -ENOTTY;
1511                 }
1512         }
1513
1514         /* cleanup and return */
1515         if (retval >= 0
1516                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1517                         && size > 0
1518                         && copy_to_user(ctl->data, buf, size) != 0)
1519                 retval = -EFAULT;
1520
1521         kfree(buf);
1522         return retval;
1523 }
1524
1525 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1526 {
1527         struct usbdevfs_ioctl   ctrl;
1528
1529         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1530                 return -EFAULT;
1531         return proc_ioctl(ps, &ctrl);
1532 }
1533
1534 #ifdef CONFIG_COMPAT
1535 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1536 {
1537         struct usbdevfs_ioctl32 __user *uioc;
1538         struct usbdevfs_ioctl ctrl;
1539         u32 udata;
1540
1541         uioc = compat_ptr((long)arg);
1542         if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1543             __get_user(ctrl.ifno, &uioc->ifno) ||
1544             __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1545             __get_user(udata, &uioc->data))
1546                 return -EFAULT;
1547         ctrl.data = compat_ptr(udata);
1548
1549         return proc_ioctl(ps, &ctrl);
1550 }
1551 #endif
1552
1553 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1554 {
1555         unsigned portnum;
1556         int rc;
1557
1558         if (get_user(portnum, (unsigned __user *) arg))
1559                 return -EFAULT;
1560         rc = usb_hub_claim_port(ps->dev, portnum, ps);
1561         if (rc == 0)
1562                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1563                         portnum, task_pid_nr(current), current->comm);
1564         return rc;
1565 }
1566
1567 static int proc_release_port(struct dev_state *ps, void __user *arg)
1568 {
1569         unsigned portnum;
1570
1571         if (get_user(portnum, (unsigned __user *) arg))
1572                 return -EFAULT;
1573         return usb_hub_release_port(ps->dev, portnum, ps);
1574 }
1575
1576 /*
1577  * NOTE:  All requests here that have interface numbers as parameters
1578  * are assuming that somehow the configuration has been prevented from
1579  * changing.  But there's no mechanism to ensure that...
1580  */
1581 static int usbdev_ioctl(struct inode *inode, struct file *file,
1582                         unsigned int cmd, unsigned long arg)
1583 {
1584         struct dev_state *ps = file->private_data;
1585         struct usb_device *dev = ps->dev;
1586         void __user *p = (void __user *)arg;
1587         int ret = -ENOTTY;
1588
1589         if (!(file->f_mode & FMODE_WRITE))
1590                 return -EPERM;
1591         usb_lock_device(dev);
1592         if (!connected(ps)) {
1593                 usb_unlock_device(dev);
1594                 return -ENODEV;
1595         }
1596
1597         switch (cmd) {
1598         case USBDEVFS_CONTROL:
1599                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1600                 ret = proc_control(ps, p);
1601                 if (ret >= 0)
1602                         inode->i_mtime = CURRENT_TIME;
1603                 break;
1604
1605         case USBDEVFS_BULK:
1606                 snoop(&dev->dev, "%s: BULK\n", __func__);
1607                 ret = proc_bulk(ps, p);
1608                 if (ret >= 0)
1609                         inode->i_mtime = CURRENT_TIME;
1610                 break;
1611
1612         case USBDEVFS_RESETEP:
1613                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1614                 ret = proc_resetep(ps, p);
1615                 if (ret >= 0)
1616                         inode->i_mtime = CURRENT_TIME;
1617                 break;
1618
1619         case USBDEVFS_RESET:
1620                 snoop(&dev->dev, "%s: RESET\n", __func__);
1621                 ret = proc_resetdevice(ps);
1622                 break;
1623
1624         case USBDEVFS_CLEAR_HALT:
1625                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1626                 ret = proc_clearhalt(ps, p);
1627                 if (ret >= 0)
1628                         inode->i_mtime = CURRENT_TIME;
1629                 break;
1630
1631         case USBDEVFS_GETDRIVER:
1632                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1633                 ret = proc_getdriver(ps, p);
1634                 break;
1635
1636         case USBDEVFS_CONNECTINFO:
1637                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1638                 ret = proc_connectinfo(ps, p);
1639                 break;
1640
1641         case USBDEVFS_SETINTERFACE:
1642                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1643                 ret = proc_setintf(ps, p);
1644                 break;
1645
1646         case USBDEVFS_SETCONFIGURATION:
1647                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1648                 ret = proc_setconfig(ps, p);
1649                 break;
1650
1651         case USBDEVFS_SUBMITURB:
1652                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1653                 ret = proc_submiturb(ps, p);
1654                 if (ret >= 0)
1655                         inode->i_mtime = CURRENT_TIME;
1656                 break;
1657
1658 #ifdef CONFIG_COMPAT
1659
1660         case USBDEVFS_SUBMITURB32:
1661                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1662                 ret = proc_submiturb_compat(ps, p);
1663                 if (ret >= 0)
1664                         inode->i_mtime = CURRENT_TIME;
1665                 break;
1666
1667         case USBDEVFS_REAPURB32:
1668                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1669                 ret = proc_reapurb_compat(ps, p);
1670                 break;
1671
1672         case USBDEVFS_REAPURBNDELAY32:
1673                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __func__);
1674                 ret = proc_reapurbnonblock_compat(ps, p);
1675                 break;
1676
1677         case USBDEVFS_IOCTL32:
1678                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1679                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1680                 break;
1681 #endif
1682
1683         case USBDEVFS_DISCARDURB:
1684                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1685                 ret = proc_unlinkurb(ps, p);
1686                 break;
1687
1688         case USBDEVFS_REAPURB:
1689                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1690                 ret = proc_reapurb(ps, p);
1691                 break;
1692
1693         case USBDEVFS_REAPURBNDELAY:
1694                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __func__);
1695                 ret = proc_reapurbnonblock(ps, p);
1696                 break;
1697
1698         case USBDEVFS_DISCSIGNAL:
1699                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1700                 ret = proc_disconnectsignal(ps, p);
1701                 break;
1702
1703         case USBDEVFS_CLAIMINTERFACE:
1704                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1705                 ret = proc_claiminterface(ps, p);
1706                 break;
1707
1708         case USBDEVFS_RELEASEINTERFACE:
1709                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1710                 ret = proc_releaseinterface(ps, p);
1711                 break;
1712
1713         case USBDEVFS_IOCTL:
1714                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1715                 ret = proc_ioctl_default(ps, p);
1716                 break;
1717
1718         case USBDEVFS_CLAIM_PORT:
1719                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
1720                 ret = proc_claim_port(ps, p);
1721                 break;
1722
1723         case USBDEVFS_RELEASE_PORT:
1724                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
1725                 ret = proc_release_port(ps, p);
1726                 break;
1727         }
1728         usb_unlock_device(dev);
1729         if (ret >= 0)
1730                 inode->i_atime = CURRENT_TIME;
1731         return ret;
1732 }
1733
1734 /* No kernel lock - fine */
1735 static unsigned int usbdev_poll(struct file *file,
1736                                 struct poll_table_struct *wait)
1737 {
1738         struct dev_state *ps = file->private_data;
1739         unsigned int mask = 0;
1740
1741         poll_wait(file, &ps->wait, wait);
1742         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1743                 mask |= POLLOUT | POLLWRNORM;
1744         if (!connected(ps))
1745                 mask |= POLLERR | POLLHUP;
1746         return mask;
1747 }
1748
1749 const struct file_operations usbdev_file_operations = {
1750         .owner =        THIS_MODULE,
1751         .llseek =       usbdev_lseek,
1752         .read =         usbdev_read,
1753         .poll =         usbdev_poll,
1754         .ioctl =        usbdev_ioctl,
1755         .open =         usbdev_open,
1756         .release =      usbdev_release,
1757 };
1758
1759 static void usbdev_remove(struct usb_device *udev)
1760 {
1761         struct dev_state *ps;
1762         struct siginfo sinfo;
1763
1764         while (!list_empty(&udev->filelist)) {
1765                 ps = list_entry(udev->filelist.next, struct dev_state, list);
1766                 destroy_all_async(ps);
1767                 wake_up_all(&ps->wait);
1768                 list_del_init(&ps->list);
1769                 if (ps->discsignr) {
1770                         sinfo.si_signo = ps->discsignr;
1771                         sinfo.si_errno = EPIPE;
1772                         sinfo.si_code = SI_ASYNCIO;
1773                         sinfo.si_addr = ps->disccontext;
1774                         kill_pid_info_as_uid(ps->discsignr, &sinfo,
1775                                         ps->disc_pid, ps->disc_uid,
1776                                         ps->disc_euid, ps->secid);
1777                 }
1778         }
1779 }
1780
1781 #ifdef CONFIG_USB_DEVICE_CLASS
1782 static struct class *usb_classdev_class;
1783
1784 static int usb_classdev_add(struct usb_device *dev)
1785 {
1786         struct device *cldev;
1787
1788         cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
1789                               NULL, "usbdev%d.%d", dev->bus->busnum,
1790                               dev->devnum);
1791         if (IS_ERR(cldev))
1792                 return PTR_ERR(cldev);
1793         dev->usb_classdev = cldev;
1794         return 0;
1795 }
1796
1797 static void usb_classdev_remove(struct usb_device *dev)
1798 {
1799         if (dev->usb_classdev)
1800                 device_unregister(dev->usb_classdev);
1801 }
1802
1803 #else
1804 #define usb_classdev_add(dev)           0
1805 #define usb_classdev_remove(dev)        do {} while (0)
1806
1807 #endif
1808
1809 static int usbdev_notify(struct notifier_block *self,
1810                                unsigned long action, void *dev)
1811 {
1812         switch (action) {
1813         case USB_DEVICE_ADD:
1814                 if (usb_classdev_add(dev))
1815                         return NOTIFY_BAD;
1816                 break;
1817         case USB_DEVICE_REMOVE:
1818                 usb_classdev_remove(dev);
1819                 usbdev_remove(dev);
1820                 break;
1821         }
1822         return NOTIFY_OK;
1823 }
1824
1825 static struct notifier_block usbdev_nb = {
1826         .notifier_call =        usbdev_notify,
1827 };
1828
1829 static struct cdev usb_device_cdev;
1830
1831 int __init usb_devio_init(void)
1832 {
1833         int retval;
1834
1835         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1836                                         "usb_device");
1837         if (retval) {
1838                 printk(KERN_ERR "Unable to register minors for usb_device\n");
1839                 goto out;
1840         }
1841         cdev_init(&usb_device_cdev, &usbdev_file_operations);
1842         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1843         if (retval) {
1844                 printk(KERN_ERR "Unable to get usb_device major %d\n",
1845                        USB_DEVICE_MAJOR);
1846                 goto error_cdev;
1847         }
1848 #ifdef CONFIG_USB_DEVICE_CLASS
1849         usb_classdev_class = class_create(THIS_MODULE, "usb_device");
1850         if (IS_ERR(usb_classdev_class)) {
1851                 printk(KERN_ERR "Unable to register usb_device class\n");
1852                 retval = PTR_ERR(usb_classdev_class);
1853                 cdev_del(&usb_device_cdev);
1854                 usb_classdev_class = NULL;
1855                 goto out;
1856         }
1857         /* devices of this class shadow the major:minor of their parent
1858          * device, so clear ->dev_kobj to prevent adding duplicate entries
1859          * to /sys/dev
1860          */
1861         usb_classdev_class->dev_kobj = NULL;
1862 #endif
1863         usb_register_notify(&usbdev_nb);
1864 out:
1865         return retval;
1866
1867 error_cdev:
1868         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1869         goto out;
1870 }
1871
1872 void usb_devio_cleanup(void)
1873 {
1874         usb_unregister_notify(&usbdev_nb);
1875 #ifdef CONFIG_USB_DEVICE_CLASS
1876         class_destroy(usb_classdev_class);
1877 #endif
1878         cdev_del(&usb_device_cdev);
1879         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1880 }