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) 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, (void *) devt, match_devt);
 563         if (!dev)
 564                 return NULL;
 565         return container_of(dev, struct usb_device, dev);
 566 }
 567
 568 /*
 569  * file operations
 570  */
 571 static int usbdev_open(struct inode *inode, struct file *file)
 572 {
 573         struct usb_device *dev = NULL;
 574         struct dev_state *ps;
 575         int ret;
 576
 577         lock_kernel();
 578         /* Protect against simultaneous removal or release */
 579         mutex_lock(&usbfs_mutex);
 580
 581         ret = -ENOMEM;
 582         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
 583         if (!ps)
 584                 goto out;
 585
 586         ret = -ENOENT;
 587
 588         /* usbdev device-node */
 589         if (imajor(inode) == USB_DEVICE_MAJOR)
 590                 dev = usbdev_lookup_by_devt(inode->i_rdev);
 591 #ifdef CONFIG_USB_DEVICEFS
 592         /* procfs file */
 593         if (!dev) {
 594                 dev = inode->i_private;
 595                 if (dev && dev->usbfs_dentry &&
 596                                         dev->usbfs_dentry->d_inode == inode)
 597                         usb_get_dev(dev);
 598                 else
 599                         dev = NULL;
 600         }
 601 #endif
 602         if (!dev || dev->state == USB_STATE_NOTATTACHED)
 603                 goto out;
 604         ret = usb_autoresume_device(dev);
 605         if (ret)
 606                 goto out;
 607
 608         ret = 0;
 609         ps->dev = dev;
 610         ps->file = file;
 611         spin_lock_init(&ps->lock);
 612         INIT_LIST_HEAD(&ps->list);
 613         INIT_LIST_HEAD(&ps->async_pending);
 614         INIT_LIST_HEAD(&ps->async_completed);
 615         init_waitqueue_head(&ps->wait);
 616         ps->discsignr = 0;
 617         ps->disc_pid = get_pid(task_pid(current));
 618         ps->disc_uid = current->uid;
 619         ps->disc_euid = current->euid;
 620         ps->disccontext = NULL;
 621         ps->ifclaimed = 0;
 622         security_task_getsecid(current, &ps->secid);
 623         smp_wmb();
 624         list_add_tail(&ps->list, &dev->filelist);
 625         file->private_data = ps;
 626  out:
 627         if (ret) {
 628                 kfree(ps);
 629                 usb_put_dev(dev);
 630         }
 631         mutex_unlock(&usbfs_mutex);
 632         unlock_kernel();
 633         return ret;
 634 }
 635
 636 static int usbdev_release(struct inode *inode, struct file *file)
 637 {
 638         struct dev_state *ps = file->private_data;
 639         struct usb_device *dev = ps->dev;
 640         unsigned int ifnum;
 641
 642         usb_lock_device(dev);
 643
 644         /* Protect against simultaneous open */
 645         mutex_lock(&usbfs_mutex);
 646         list_del_init(&ps->list);
 647         mutex_unlock(&usbfs_mutex);
 648
 649         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 650                         ifnum++) {
 651                 if (test_bit(ifnum, &ps->ifclaimed))
 652                         releaseintf(ps, ifnum);
 653         }
 654         destroy_all_async(ps);
 655         usb_autosuspend_device(dev);
 656         usb_unlock_device(dev);
 657         usb_put_dev(dev);
 658         put_pid(ps->disc_pid);
 659         kfree(ps);
 660         return 0;
 661 }
 662
 663 static int proc_control(struct dev_state *ps, void __user *arg)
 664 {
 665         struct usb_device *dev = ps->dev;
 666         struct usbdevfs_ctrltransfer ctrl;
 667         unsigned int tmo;
 668         unsigned char *tbuf;
 669         unsigned wLength;
 670         int i, j, ret;
 671
 672         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 673                 return -EFAULT;
 674         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
 675         if (ret)
 676                 return ret;
 677         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
 678         if (wLength > PAGE_SIZE)
 679                 return -EINVAL;
 680         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
 681         if (!tbuf)
 682                 return -ENOMEM;
 683         tmo = ctrl.timeout;
 684         if (ctrl.bRequestType & 0x80) {
 685                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
 686                                                ctrl.wLength)) {
 687                         free_page((unsigned long)tbuf);
 688                         return -EINVAL;
 689                 }
 690                 snoop(&dev->dev, "control read: bRequest=%02x "
 691                                 "bRrequestType=%02x wValue=%04x "
 692                                 "wIndex=%04x wLength=%04x\n",
 693                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 694                                 ctrl.wIndex, ctrl.wLength);
 695
 696                 usb_unlock_device(dev);
 697                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest,
 698                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 699                                     tbuf, ctrl.wLength, tmo);
 700                 usb_lock_device(dev);
 701                 if ((i > 0) && ctrl.wLength) {
 702                         if (usbfs_snoop) {
 703                                 dev_info(&dev->dev, "control read: data ");
 704                                 for (j = 0; j < i; ++j)
 705                                         printk("%02x ", (u8)(tbuf)[j]);
 706                                 printk("\n");
 707                         }
 708                         if (copy_to_user(ctrl.data, tbuf, i)) {
 709                                 free_page((unsigned long)tbuf);
 710                                 return -EFAULT;
 711                         }
 712                 }
 713         } else {
 714                 if (ctrl.wLength) {
 715                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 716                                 free_page((unsigned long)tbuf);
 717                                 return -EFAULT;
 718                         }
 719                 }
 720                 snoop(&dev->dev, "control write: bRequest=%02x "
 721                                 "bRrequestType=%02x wValue=%04x "
 722                                 "wIndex=%04x wLength=%04x\n",
 723                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 724                                 ctrl.wIndex, ctrl.wLength);
 725                 if (usbfs_snoop) {
 726                         dev_info(&dev->dev, "control write: data: ");
 727                         for (j = 0; j < ctrl.wLength; ++j)
 728                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 729                         printk("\n");
 730                 }
 731                 usb_unlock_device(dev);
 732                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
 733                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 734                                     tbuf, ctrl.wLength, tmo);
 735                 usb_lock_device(dev);
 736         }
 737         free_page((unsigned long)tbuf);
 738         if (i < 0 && i != -EPIPE) {
 739                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 740                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 741                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 742                            ctrl.wLength, i);
 743         }
 744         return i;
 745 }
 746
 747 static int proc_bulk(struct dev_state *ps, void __user *arg)
 748 {
 749         struct usb_device *dev = ps->dev;
 750         struct usbdevfs_bulktransfer bulk;
 751         unsigned int tmo, len1, pipe;
 752         int len2;
 753         unsigned char *tbuf;
 754         int i, j, ret;
 755
 756         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 757                 return -EFAULT;
 758         ret = findintfep(ps->dev, bulk.ep);
 759         if (ret < 0)
 760                 return ret;
 761         ret = checkintf(ps, ret);
 762         if (ret)
 763                 return ret;
 764         if (bulk.ep & USB_DIR_IN)
 765                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 766         else
 767                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 768         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 769                 return -EINVAL;
 770         len1 = bulk.len;
 771         if (len1 > MAX_USBFS_BUFFER_SIZE)
 772                 return -EINVAL;
 773         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 774                 return -ENOMEM;
 775         tmo = bulk.timeout;
 776         if (bulk.ep & 0x80) {
 777                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 778                         kfree(tbuf);
 779                         return -EINVAL;
 780                 }
 781                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
 782                         bulk.len, bulk.timeout);
 783                 usb_unlock_device(dev);
 784                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 785                 usb_lock_device(dev);
 786                 if (!i && len2) {
 787                         if (usbfs_snoop) {
 788                                 dev_info(&dev->dev, "bulk read: data ");
 789                                 for (j = 0; j < len2; ++j)
 790                                         printk("%02x ", (u8)(tbuf)[j]);
 791                                 printk("\n");
 792                         }
 793                         if (copy_to_user(bulk.data, tbuf, len2)) {
 794                                 kfree(tbuf);
 795                                 return -EFAULT;
 796                         }
 797                 }
 798         } else {
 799                 if (len1) {
 800                         if (copy_from_user(tbuf, bulk.data, len1)) {
 801                                 kfree(tbuf);
 802                                 return -EFAULT;
 803                         }
 804                 }
 805                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
 806                         bulk.len, bulk.timeout);
 807                 if (usbfs_snoop) {
 808                         dev_info(&dev->dev, "bulk write: data: ");
 809                         for (j = 0; j < len1; ++j)
 810                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 811                         printk("\n");
 812                 }
 813                 usb_unlock_device(dev);
 814                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 815                 usb_lock_device(dev);
 816         }
 817         kfree(tbuf);
 818         if (i < 0)
 819                 return i;
 820         return len2;
 821 }
 822
 823 static int proc_resetep(struct dev_state *ps, void __user *arg)
 824 {
 825         unsigned int ep;
 826         int ret;
 827
 828         if (get_user(ep, (unsigned int __user *)arg))
 829                 return -EFAULT;
 830         ret = findintfep(ps->dev, ep);
 831         if (ret < 0)
 832                 return ret;
 833         ret = checkintf(ps, ret);
 834         if (ret)
 835                 return ret;
 836         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
 837         return 0;
 838 }
 839
 840 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 841 {
 842         unsigned int ep;
 843         int pipe;
 844         int ret;
 845
 846         if (get_user(ep, (unsigned int __user *)arg))
 847                 return -EFAULT;
 848         ret = findintfep(ps->dev, ep);
 849         if (ret < 0)
 850                 return ret;
 851         ret = checkintf(ps, ret);
 852         if (ret)
 853                 return ret;
 854         if (ep & USB_DIR_IN)
 855                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 856         else
 857                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 858
 859         return usb_clear_halt(ps->dev, pipe);
 860 }
 861
 862 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 863 {
 864         struct usbdevfs_getdriver gd;
 865         struct usb_interface *intf;
 866         int ret;
 867
 868         if (copy_from_user(&gd, arg, sizeof(gd)))
 869                 return -EFAULT;
 870         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 871         if (!intf || !intf->dev.driver)
 872                 ret = -ENODATA;
 873         else {
 874                 strncpy(gd.driver, intf->dev.driver->name,
 875                                 sizeof(gd.driver));
 876                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 877         }
 878         return ret;
 879 }
 880
 881 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 882 {
 883         struct usbdevfs_connectinfo ci;
 884
 885         ci.devnum = ps->dev->devnum;
 886         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 887         if (copy_to_user(arg, &ci, sizeof(ci)))
 888                 return -EFAULT;
 889         return 0;
 890 }
 891
 892 static int proc_resetdevice(struct dev_state *ps)
 893 {
 894         return usb_reset_device(ps->dev);
 895 }
 896
 897 static int proc_setintf(struct dev_state *ps, void __user *arg)
 898 {
 899         struct usbdevfs_setinterface setintf;
 900         int ret;
 901
 902         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 903                 return -EFAULT;
 904         if ((ret = checkintf(ps, setintf.interface)))
 905                 return ret;
 906         return usb_set_interface(ps->dev, setintf.interface,
 907                         setintf.altsetting);
 908 }
 909
 910 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 911 {
 912         int u;
 913         int status = 0;
 914         struct usb_host_config *actconfig;
 915
 916         if (get_user(u, (int __user *)arg))
 917                 return -EFAULT;
 918
 919         actconfig = ps->dev->actconfig;
 920
 921         /* Don't touch the device if any interfaces are claimed.
 922          * It could interfere with other drivers' operations, and if
 923          * an interface is claimed by usbfs it could easily deadlock.
 924          */
 925         if (actconfig) {
 926                 int i;
 927
 928                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 929                         if (usb_interface_claimed(actconfig->interface[i])) {
 930                                 dev_warn(&ps->dev->dev,
 931                                         "usbfs: interface %d claimed by %s "
 932                                         "while '%s' sets config #%d\n",
 933                                         actconfig->interface[i]
 934                                                 ->cur_altsetting
 935                                                 ->desc.bInterfaceNumber,
 936                                         actconfig->interface[i]
 937                                                 ->dev.driver->name,
 938                                         current->comm, u);
 939                                 status = -EBUSY;
 940                                 break;
 941                         }
 942                 }
 943         }
 944
 945         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 946          * so avoid usb_set_configuration()'s kick to sysfs
 947          */
 948         if (status == 0) {
 949                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 950                         status = usb_reset_configuration(ps->dev);
 951                 else
 952                         status = usb_set_configuration(ps->dev, u);
 953         }
 954
 955         return status;
 956 }
 957
 958 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 959                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
 960                         void __user *arg)
 961 {
 962         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 963         struct usb_host_endpoint *ep;
 964         struct async *as;
 965         struct usb_ctrlrequest *dr = NULL;
 966         unsigned int u, totlen, isofrmlen;
 967         int ret, ifnum = -1;
 968         int is_in;
 969
 970         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
 971                                 USBDEVFS_URB_SHORT_NOT_OK |
 972                                 USBDEVFS_URB_NO_FSBR |
 973                                 USBDEVFS_URB_ZERO_PACKET |
 974                                 USBDEVFS_URB_NO_INTERRUPT))
 975                 return -EINVAL;
 976         if (!uurb->buffer)
 977                 return -EINVAL;
 978         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN ||
 979                                  uurb->signr > SIGRTMAX))
 980                 return -EINVAL;
 981         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
 982             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
 983                 ifnum = findintfep(ps->dev, uurb->endpoint);
 984                 if (ifnum < 0)
 985                         return ifnum;
 986                 ret = checkintf(ps, ifnum);
 987                 if (ret)
 988                         return ret;
 989         }
 990         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
 991                 is_in = 1;
 992                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 993         } else {
 994                 is_in = 0;
 995                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 996         }
 997         if (!ep)
 998                 return -ENOENT;
 999         switch(uurb->type) {
1000         case USBDEVFS_URB_TYPE_CONTROL:
1001                 if (!usb_endpoint_xfer_control(&ep->desc))
1002                         return -EINVAL;
1003                 /* min 8 byte setup packet,
1004                  * max 8 byte setup plus an arbitrary data stage */
1005                 if (uurb->buffer_length < 8 ||
1006                     uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1007                         return -EINVAL;
1008                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1009                 if (!dr)
1010                         return -ENOMEM;
1011                 if (copy_from_user(dr, uurb->buffer, 8)) {
1012                         kfree(dr);
1013                         return -EFAULT;
1014                 }
1015                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1016                         kfree(dr);
1017                         return -EINVAL;
1018                 }
1019                 ret = check_ctrlrecip(ps, dr->bRequestType,
1020                                       le16_to_cpup(&dr->wIndex));
1021                 if (ret) {
1022                         kfree(dr);
1023                         return ret;
1024                 }
1025                 uurb->number_of_packets = 0;
1026                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1027                 uurb->buffer += 8;
1028                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1029                         is_in = 1;
1030                         uurb->endpoint |= USB_DIR_IN;
1031                 } else {
1032                         is_in = 0;
1033                         uurb->endpoint &= ~USB_DIR_IN;
1034                 }
1035                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1036                                 uurb->buffer, uurb->buffer_length)) {
1037                         kfree(dr);
1038                         return -EFAULT;
1039                 }
1040                 snoop(&ps->dev->dev, "control urb: bRequest=%02x "
1041                         "bRrequestType=%02x wValue=%04x "
1042                         "wIndex=%04x wLength=%04x\n",
1043                         dr->bRequest, dr->bRequestType,
1044                         __le16_to_cpup(&dr->wValue),
1045                         __le16_to_cpup(&dr->wIndex),
1046                         __le16_to_cpup(&dr->wLength));
1047                 break;
1048
1049         case USBDEVFS_URB_TYPE_BULK:
1050                 switch (usb_endpoint_type(&ep->desc)) {
1051                 case USB_ENDPOINT_XFER_CONTROL:
1052                 case USB_ENDPOINT_XFER_ISOC:
1053                         return -EINVAL;
1054                 /* allow single-shot interrupt transfers, at bogus rates */
1055                 }
1056                 uurb->number_of_packets = 0;
1057                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1058                         return -EINVAL;
1059                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1060                                 uurb->buffer, uurb->buffer_length))
1061                         return -EFAULT;
1062                 snoop(&ps->dev->dev, "bulk urb\n");
1063                 break;
1064
1065         case USBDEVFS_URB_TYPE_ISO:
1066                 /* arbitrary limit */
1067                 if (uurb->number_of_packets < 1 ||
1068                     uurb->number_of_packets > 128)
1069                         return -EINVAL;
1070                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1071                         return -EINVAL;
1072                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1073                                    uurb->number_of_packets;
1074                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1075                         return -ENOMEM;
1076                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1077                         kfree(isopkt);
1078                         return -EFAULT;
1079                 }
1080                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1081                         /* arbitrary limit,
1082                          * sufficient for USB 2.0 high-bandwidth iso */
1083                         if (isopkt[u].length > 8192) {
1084                                 kfree(isopkt);
1085                                 return -EINVAL;
1086                         }
1087                         totlen += isopkt[u].length;
1088                 }
1089                 if (totlen > 32768) {
1090                         kfree(isopkt);
1091                         return -EINVAL;
1092                 }
1093                 uurb->buffer_length = totlen;
1094                 snoop(&ps->dev->dev, "iso urb\n");
1095                 break;
1096
1097         case USBDEVFS_URB_TYPE_INTERRUPT:
1098                 uurb->number_of_packets = 0;
1099                 if (!usb_endpoint_xfer_int(&ep->desc))
1100                         return -EINVAL;
1101                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1102                         return -EINVAL;
1103                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1104                                 uurb->buffer, uurb->buffer_length))
1105                         return -EFAULT;
1106                 snoop(&ps->dev->dev, "interrupt urb\n");
1107                 break;
1108
1109         default:
1110                 return -EINVAL;
1111         }
1112         as = alloc_async(uurb->number_of_packets);
1113         if (!as) {
1114                 kfree(isopkt);
1115                 kfree(dr);
1116                 return -ENOMEM;
1117         }
1118         as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL);
1119         if (!as->urb->transfer_buffer) {
1120                 kfree(isopkt);
1121                 kfree(dr);
1122                 free_async(as);
1123                 return -ENOMEM;
1124         }
1125         as->urb->dev = ps->dev;
1126         as->urb->pipe = (uurb->type << 30) |
1127                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1128                         (uurb->endpoint & USB_DIR_IN);
1129
1130         /* This tedious sequence is necessary because the URB_* flags
1131          * are internal to the kernel and subject to change, whereas
1132          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1133          */
1134         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1135         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1136                 u |= URB_ISO_ASAP;
1137         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1138                 u |= URB_SHORT_NOT_OK;
1139         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1140                 u |= URB_NO_FSBR;
1141         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1142                 u |= URB_ZERO_PACKET;
1143         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1144                 u |= URB_NO_INTERRUPT;
1145         as->urb->transfer_flags = u;
1146
1147         as->urb->transfer_buffer_length = uurb->buffer_length;
1148         as->urb->setup_packet = (unsigned char *)dr;
1149         as->urb->start_frame = uurb->start_frame;
1150         as->urb->number_of_packets = uurb->number_of_packets;
1151         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1152                         ps->dev->speed == USB_SPEED_HIGH)
1153                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1154         else
1155                 as->urb->interval = ep->desc.bInterval;
1156         as->urb->context = as;
1157         as->urb->complete = async_completed;
1158         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1159                 as->urb->iso_frame_desc[u].offset = totlen;
1160                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1161                 totlen += isopkt[u].length;
1162         }
1163         kfree(isopkt);
1164         as->ps = ps;
1165         as->userurb = arg;
1166         if (uurb->endpoint & USB_DIR_IN)
1167                 as->userbuffer = uurb->buffer;
1168         else
1169                 as->userbuffer = NULL;
1170         as->signr = uurb->signr;
1171         as->ifnum = ifnum;
1172         as->pid = get_pid(task_pid(current));
1173         as->uid = current->uid;
1174         as->euid = current->euid;
1175         security_task_getsecid(current, &as->secid);
1176         if (!is_in) {
1177                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1178                                 as->urb->transfer_buffer_length)) {
1179                         free_async(as);
1180                         return -EFAULT;
1181                 }
1182         }
1183         snoop_urb(as->urb, as->userurb);
1184         async_newpending(as);
1185         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1186                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1187                            "usbfs: usb_submit_urb returned %d\n", ret);
1188                 async_removepending(as);
1189                 free_async(as);
1190                 return ret;
1191         }
1192         return 0;
1193 }
1194
1195 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1196 {
1197         struct usbdevfs_urb uurb;
1198
1199         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1200                 return -EFAULT;
1201
1202         return proc_do_submiturb(ps, &uurb,
1203                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1204                         arg);
1205 }
1206
1207 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1208 {
1209         struct async *as;
1210
1211         as = async_getpending(ps, arg);
1212         if (!as)
1213                 return -EINVAL;
1214         usb_kill_urb(as->urb);
1215         return 0;
1216 }
1217
1218 static int processcompl(struct async *as, void __user * __user *arg)
1219 {
1220         struct urb *urb = as->urb;
1221         struct usbdevfs_urb __user *userurb = as->userurb;
1222         void __user *addr = as->userurb;
1223         unsigned int i;
1224
1225         if (as->userbuffer)
1226                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1227                                  urb->transfer_buffer_length))
1228                         return -EFAULT;
1229         if (put_user(as->status, &userurb->status))
1230                 return -EFAULT;
1231         if (put_user(urb->actual_length, &userurb->actual_length))
1232                 return -EFAULT;
1233         if (put_user(urb->error_count, &userurb->error_count))
1234                 return -EFAULT;
1235
1236         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1237                 for (i = 0; i < urb->number_of_packets; i++) {
1238                         if (put_user(urb->iso_frame_desc[i].actual_length,
1239                                      &userurb->iso_frame_desc[i].actual_length))
1240                                 return -EFAULT;
1241                         if (put_user(urb->iso_frame_desc[i].status,
1242                                      &userurb->iso_frame_desc[i].status))
1243                                 return -EFAULT;
1244                 }
1245         }
1246
1247         free_async(as);
1248
1249         if (put_user(addr, (void __user * __user *)arg))
1250                 return -EFAULT;
1251         return 0;
1252 }
1253
1254 static struct async *reap_as(struct dev_state *ps)
1255 {
1256         DECLARE_WAITQUEUE(wait, current);
1257         struct async *as = NULL;
1258         struct usb_device *dev = ps->dev;
1259
1260         add_wait_queue(&ps->wait, &wait);
1261         for (;;) {
1262                 __set_current_state(TASK_INTERRUPTIBLE);
1263                 as = async_getcompleted(ps);
1264                 if (as)
1265                         break;
1266                 if (signal_pending(current))
1267                         break;
1268                 usb_unlock_device(dev);
1269                 schedule();
1270                 usb_lock_device(dev);
1271         }
1272         remove_wait_queue(&ps->wait, &wait);
1273         set_current_state(TASK_RUNNING);
1274         return as;
1275 }
1276
1277 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1278 {
1279         struct async *as = reap_as(ps);
1280         if (as)
1281                 return processcompl(as, (void __user * __user *)arg);
1282         if (signal_pending(current))
1283                 return -EINTR;
1284         return -EIO;
1285 }
1286
1287 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1288 {
1289         struct async *as;
1290
1291         if (!(as = async_getcompleted(ps)))
1292                 return -EAGAIN;
1293         return processcompl(as, (void __user * __user *)arg);
1294 }
1295
1296 #ifdef CONFIG_COMPAT
1297
1298 static int get_urb32(struct usbdevfs_urb *kurb,
1299                      struct usbdevfs_urb32 __user *uurb)
1300 {
1301         __u32  uptr;
1302         if (get_user(kurb->type, &uurb->type) ||
1303             __get_user(kurb->endpoint, &uurb->endpoint) ||
1304             __get_user(kurb->status, &uurb->status) ||
1305             __get_user(kurb->flags, &uurb->flags) ||
1306             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1307             __get_user(kurb->actual_length, &uurb->actual_length) ||
1308             __get_user(kurb->start_frame, &uurb->start_frame) ||
1309             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1310             __get_user(kurb->error_count, &uurb->error_count) ||
1311             __get_user(kurb->signr, &uurb->signr))
1312                 return -EFAULT;
1313
1314         if (__get_user(uptr, &uurb->buffer))
1315                 return -EFAULT;
1316         kurb->buffer = compat_ptr(uptr);
1317         if (__get_user(uptr, &uurb->buffer))
1318                 return -EFAULT;
1319         kurb->usercontext = compat_ptr(uptr);
1320
1321         return 0;
1322 }
1323
1324 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1325 {
1326         struct usbdevfs_urb uurb;
1327
1328         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1329                 return -EFAULT;
1330
1331         return proc_do_submiturb(ps, &uurb,
1332                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1333                         arg);
1334 }
1335
1336 static int processcompl_compat(struct async *as, void __user * __user *arg)
1337 {
1338         struct urb *urb = as->urb;
1339         struct usbdevfs_urb32 __user *userurb = as->userurb;
1340         void __user *addr = as->userurb;
1341         unsigned int i;
1342
1343         if (as->userbuffer)
1344                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1345                                  urb->transfer_buffer_length))
1346                         return -EFAULT;
1347         if (put_user(as->status, &userurb->status))
1348                 return -EFAULT;
1349         if (put_user(urb->actual_length, &userurb->actual_length))
1350                 return -EFAULT;
1351         if (put_user(urb->error_count, &userurb->error_count))
1352                 return -EFAULT;
1353
1354         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1355                 for (i = 0; i < urb->number_of_packets; i++) {
1356                         if (put_user(urb->iso_frame_desc[i].actual_length,
1357                                      &userurb->iso_frame_desc[i].actual_length))
1358                                 return -EFAULT;
1359                         if (put_user(urb->iso_frame_desc[i].status,
1360                                      &userurb->iso_frame_desc[i].status))
1361                                 return -EFAULT;
1362                 }
1363         }
1364
1365         free_async(as);
1366         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1367                 return -EFAULT;
1368         return 0;
1369 }
1370
1371 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1372 {
1373         struct async *as = reap_as(ps);
1374         if (as)
1375                 return processcompl_compat(as, (void __user * __user *)arg);
1376         if (signal_pending(current))
1377                 return -EINTR;
1378         return -EIO;
1379 }
1380
1381 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1382 {
1383         struct async *as;
1384
1385         if (!(as = async_getcompleted(ps)))
1386                 return -EAGAIN;
1387         return processcompl_compat(as, (void __user * __user *)arg);
1388 }
1389
1390 #endif
1391
1392 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1393 {
1394         struct usbdevfs_disconnectsignal ds;
1395
1396         if (copy_from_user(&ds, arg, sizeof(ds)))
1397                 return -EFAULT;
1398         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1399                 return -EINVAL;
1400         ps->discsignr = ds.signr;
1401         ps->disccontext = ds.context;
1402         return 0;
1403 }
1404
1405 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1406 {
1407         unsigned int ifnum;
1408
1409         if (get_user(ifnum, (unsigned int __user *)arg))
1410                 return -EFAULT;
1411         return claimintf(ps, ifnum);
1412 }
1413
1414 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1415 {
1416         unsigned int ifnum;
1417         int ret;
1418
1419         if (get_user(ifnum, (unsigned int __user *)arg))
1420                 return -EFAULT;
1421         if ((ret = releaseintf(ps, ifnum)) < 0)
1422                 return ret;
1423         destroy_async_on_interface (ps, ifnum);
1424         return 0;
1425 }
1426
1427 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1428 {
1429         int                     size;
1430         void                    *buf = NULL;
1431         int                     retval = 0;
1432         struct usb_interface    *intf = NULL;
1433         struct usb_driver       *driver = NULL;
1434
1435         /* alloc buffer */
1436         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1437                 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1438                         return -ENOMEM;
1439                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1440                         if (copy_from_user(buf, ctl->data, size)) {
1441                                 kfree(buf);
1442                                 return -EFAULT;
1443                         }
1444                 } else {
1445                         memset(buf, 0, size);
1446                 }
1447         }
1448
1449         if (!connected(ps)) {
1450                 kfree(buf);
1451                 return -ENODEV;
1452         }
1453
1454         if (ps->dev->state != USB_STATE_CONFIGURED)
1455                 retval = -EHOSTUNREACH;
1456         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1457                 retval = -EINVAL;
1458         else switch (ctl->ioctl_code) {
1459
1460         /* disconnect kernel driver from interface */
1461         case USBDEVFS_DISCONNECT:
1462                 if (intf->dev.driver) {
1463                         driver = to_usb_driver(intf->dev.driver);
1464                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1465                         usb_driver_release_interface(driver, intf);
1466                 } else
1467                         retval = -ENODATA;
1468                 break;
1469
1470         /* let kernel drivers try to (re)bind to the interface */
1471         case USBDEVFS_CONNECT:
1472                 if (!intf->dev.driver)
1473                         retval = device_attach(&intf->dev);
1474                 else
1475                         retval = -EBUSY;
1476                 break;
1477
1478         /* talk directly to the interface's driver */
1479         default:
1480                 if (intf->dev.driver)
1481                         driver = to_usb_driver(intf->dev.driver);
1482                 if (driver == NULL || driver->ioctl == NULL) {
1483                         retval = -ENOTTY;
1484                 } else {
1485                         retval = driver->ioctl(intf, ctl->ioctl_code, buf);
1486                         if (retval == -ENOIOCTLCMD)
1487                                 retval = -ENOTTY;
1488                 }
1489         }
1490
1491         /* cleanup and return */
1492         if (retval >= 0
1493                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1494                         && size > 0
1495                         && copy_to_user(ctl->data, buf, size) != 0)
1496                 retval = -EFAULT;
1497
1498         kfree(buf);
1499         return retval;
1500 }
1501
1502 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1503 {
1504         struct usbdevfs_ioctl   ctrl;
1505
1506         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1507                 return -EFAULT;
1508         return proc_ioctl(ps, &ctrl);
1509 }
1510
1511 #ifdef CONFIG_COMPAT
1512 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1513 {
1514         struct usbdevfs_ioctl32 __user *uioc;
1515         struct usbdevfs_ioctl ctrl;
1516         u32 udata;
1517
1518         uioc = compat_ptr((long)arg);
1519         if (get_user(ctrl.ifno, &uioc->ifno) ||
1520             get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1521             __get_user(udata, &uioc->data))
1522                 return -EFAULT;
1523         ctrl.data = compat_ptr(udata);
1524
1525         return proc_ioctl(ps, &ctrl);
1526 }
1527 #endif
1528
1529 /*
1530  * NOTE:  All requests here that have interface numbers as parameters
1531  * are assuming that somehow the configuration has been prevented from
1532  * changing.  But there's no mechanism to ensure that...
1533  */
1534 static int usbdev_ioctl(struct inode *inode, struct file *file,
1535                         unsigned int cmd, unsigned long arg)
1536 {
1537         struct dev_state *ps = file->private_data;
1538         struct usb_device *dev = ps->dev;
1539         void __user *p = (void __user *)arg;
1540         int ret = -ENOTTY;
1541
1542         if (!(file->f_mode & FMODE_WRITE))
1543                 return -EPERM;
1544         usb_lock_device(dev);
1545         if (!connected(ps)) {
1546                 usb_unlock_device(dev);
1547                 return -ENODEV;
1548         }
1549
1550         switch (cmd) {
1551         case USBDEVFS_CONTROL:
1552                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1553                 ret = proc_control(ps, p);
1554                 if (ret >= 0)
1555                         inode->i_mtime = CURRENT_TIME;
1556                 break;
1557
1558         case USBDEVFS_BULK:
1559                 snoop(&dev->dev, "%s: BULK\n", __func__);
1560                 ret = proc_bulk(ps, p);
1561                 if (ret >= 0)
1562                         inode->i_mtime = CURRENT_TIME;
1563                 break;
1564
1565         case USBDEVFS_RESETEP:
1566                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1567                 ret = proc_resetep(ps, p);
1568                 if (ret >= 0)
1569                         inode->i_mtime = CURRENT_TIME;
1570                 break;
1571
1572         case USBDEVFS_RESET:
1573                 snoop(&dev->dev, "%s: RESET\n", __func__);
1574                 ret = proc_resetdevice(ps);
1575                 break;
1576
1577         case USBDEVFS_CLEAR_HALT:
1578                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1579                 ret = proc_clearhalt(ps, p);
1580                 if (ret >= 0)
1581                         inode->i_mtime = CURRENT_TIME;
1582                 break;
1583
1584         case USBDEVFS_GETDRIVER:
1585                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1586                 ret = proc_getdriver(ps, p);
1587                 break;
1588
1589         case USBDEVFS_CONNECTINFO:
1590                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1591                 ret = proc_connectinfo(ps, p);
1592                 break;
1593
1594         case USBDEVFS_SETINTERFACE:
1595                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1596                 ret = proc_setintf(ps, p);
1597                 break;
1598
1599         case USBDEVFS_SETCONFIGURATION:
1600                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1601                 ret = proc_setconfig(ps, p);
1602                 break;
1603
1604         case USBDEVFS_SUBMITURB:
1605                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1606                 ret = proc_submiturb(ps, p);
1607                 if (ret >= 0)
1608                         inode->i_mtime = CURRENT_TIME;
1609                 break;
1610
1611 #ifdef CONFIG_COMPAT
1612
1613         case USBDEVFS_SUBMITURB32:
1614                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1615                 ret = proc_submiturb_compat(ps, p);
1616                 if (ret >= 0)
1617                         inode->i_mtime = CURRENT_TIME;
1618                 break;
1619
1620         case USBDEVFS_REAPURB32:
1621                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1622                 ret = proc_reapurb_compat(ps, p);
1623                 break;
1624
1625         case USBDEVFS_REAPURBNDELAY32:
1626                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __func__);
1627                 ret = proc_reapurbnonblock_compat(ps, p);
1628                 break;
1629
1630         case USBDEVFS_IOCTL32:
1631                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1632                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1633                 break;
1634 #endif
1635
1636         case USBDEVFS_DISCARDURB:
1637                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1638                 ret = proc_unlinkurb(ps, p);
1639                 break;
1640
1641         case USBDEVFS_REAPURB:
1642                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1643                 ret = proc_reapurb(ps, p);
1644                 break;
1645
1646         case USBDEVFS_REAPURBNDELAY:
1647                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __func__);
1648                 ret = proc_reapurbnonblock(ps, p);
1649                 break;
1650
1651         case USBDEVFS_DISCSIGNAL:
1652                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1653                 ret = proc_disconnectsignal(ps, p);
1654                 break;
1655
1656         case USBDEVFS_CLAIMINTERFACE:
1657                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1658                 ret = proc_claiminterface(ps, p);
1659                 break;
1660
1661         case USBDEVFS_RELEASEINTERFACE:
1662                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1663                 ret = proc_releaseinterface(ps, p);
1664                 break;
1665
1666         case USBDEVFS_IOCTL:
1667                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1668                 ret = proc_ioctl_default(ps, p);
1669                 break;
1670         }
1671         usb_unlock_device(dev);
1672         if (ret >= 0)
1673                 inode->i_atime = CURRENT_TIME;
1674         return ret;
1675 }
1676
1677 /* No kernel lock - fine */
1678 static unsigned int usbdev_poll(struct file *file,
1679                                 struct poll_table_struct *wait)
1680 {
1681         struct dev_state *ps = file->private_data;
1682         unsigned int mask = 0;
1683
1684         poll_wait(file, &ps->wait, wait);
1685         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1686                 mask |= POLLOUT | POLLWRNORM;
1687         if (!connected(ps))
1688                 mask |= POLLERR | POLLHUP;
1689         return mask;
1690 }
1691
1692 const struct file_operations usbdev_file_operations = {
1693         .owner =        THIS_MODULE,
1694         .llseek =       usbdev_lseek,
1695         .read =         usbdev_read,
1696         .poll =         usbdev_poll,
1697         .ioctl =        usbdev_ioctl,
1698         .open =         usbdev_open,
1699         .release =      usbdev_release,
1700 };
1701
1702 void usb_fs_classdev_common_remove(struct usb_device *udev)
1703 {
1704         struct dev_state *ps;
1705         struct siginfo sinfo;
1706
1707         while (!list_empty(&udev->filelist)) {
1708                 ps = list_entry(udev->filelist.next, struct dev_state, list);
1709                 destroy_all_async(ps);
1710                 wake_up_all(&ps->wait);
1711                 list_del_init(&ps->list);
1712                 if (ps->discsignr) {
1713                         sinfo.si_signo = ps->discsignr;
1714                         sinfo.si_errno = EPIPE;
1715                         sinfo.si_code = SI_ASYNCIO;
1716                         sinfo.si_addr = ps->disccontext;
1717                         kill_pid_info_as_uid(ps->discsignr, &sinfo,
1718                                         ps->disc_pid, ps->disc_uid,
1719                                         ps->disc_euid, ps->secid);
1720                 }
1721         }
1722 }
1723
1724 #ifdef CONFIG_USB_DEVICE_CLASS
1725 static struct class *usb_classdev_class;
1726
1727 static int usb_classdev_add(struct usb_device *dev)
1728 {
1729         int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1730
1731         dev->usb_classdev = device_create(usb_classdev_class, &dev->dev,
1732                                 MKDEV(USB_DEVICE_MAJOR, minor),
1733                                 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1734         if (IS_ERR(dev->usb_classdev))
1735                 return PTR_ERR(dev->usb_classdev);
1736
1737         return 0;
1738 }
1739
1740 static void usb_classdev_remove(struct usb_device *dev)
1741 {
1742         device_unregister(dev->usb_classdev);
1743         usb_fs_classdev_common_remove(dev);
1744 }
1745
1746 static int usb_classdev_notify(struct notifier_block *self,
1747                                unsigned long action, void *dev)
1748 {
1749         switch (action) {
1750         case USB_DEVICE_ADD:
1751                 if (usb_classdev_add(dev))
1752                         return NOTIFY_BAD;
1753                 break;
1754         case USB_DEVICE_REMOVE:
1755                 usb_classdev_remove(dev);
1756                 break;
1757         }
1758         return NOTIFY_OK;
1759 }
1760
1761 static struct notifier_block usbdev_nb = {
1762         .notifier_call =        usb_classdev_notify,
1763 };
1764 #endif
1765
1766 static struct cdev usb_device_cdev;
1767
1768 int __init usb_devio_init(void)
1769 {
1770         int retval;
1771
1772         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1773                                         "usb_device");
1774         if (retval) {
1775                 err("unable to register minors for usb_device");
1776                 goto out;
1777         }
1778         cdev_init(&usb_device_cdev, &usbdev_file_operations);
1779         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1780         if (retval) {
1781                 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1782                 goto error_cdev;
1783         }
1784 #ifdef CONFIG_USB_DEVICE_CLASS
1785         usb_classdev_class = class_create(THIS_MODULE, "usb_device");
1786         if (IS_ERR(usb_classdev_class)) {
1787                 err("unable to register usb_device class");
1788                 retval = PTR_ERR(usb_classdev_class);
1789                 cdev_del(&usb_device_cdev);
1790                 usb_classdev_class = NULL;
1791                 goto out;
1792         }
1793
1794         usb_register_notify(&usbdev_nb);
1795 #endif
1796 out:
1797         return retval;
1798
1799 error_cdev:
1800         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1801         goto out;
1802 }
1803
1804 void usb_devio_cleanup(void)
1805 {
1806 #ifdef CONFIG_USB_DEVICE_CLASS
1807         usb_unregister_notify(&usbdev_nb);
1808         class_destroy(usb_classdev_class);
1809 #endif
1810         cdev_del(&usb_device_cdev);
1811         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1812 }