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