drivers/usb/core/devio.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *      devio.c  --  User space communication with USB devices.
   5  *
   6  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   7  *
   8  *      This program is free software; you can redistribute it and/or modify
   9  *      it under the terms of the GNU General Public License as published by
  10  *      the Free Software Foundation; either version 2 of the License, or
  11  *      (at your option) any later version.
  12  *
  13  *      This program is distributed in the hope that it will be useful,
  14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *      GNU General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License
  19  *      along with this program; if not, write to the Free Software
  20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  *  $Id: devio.c,v 1.7 2000/02/01 17:28:48 fliegl Exp $
  23  *
  24  *  This file implements the usbfs/x/y files, where
  25  *  x is the bus number and y the device number.
  26  *
  27  *  It allows user space programs/"drivers" to communicate directly
  28  *  with USB devices without intervening kernel driver.
  29  *
  30  *  Revision history
  31  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  32  *    04.01.2000   0.2   Turned into its own filesystem
  33  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  34  *                       (CAN-2005-3055)
  35  */
  36
  37 /*****************************************************************************/
  38
  39 #include <linux/fs.h>
  40 #include <linux/mm.h>
  41 #include <linux/slab.h>
  42 #include <linux/smp_lock.h>
  43 #include <linux/signal.h>
  44 #include <linux/poll.h>
  45 #include <linux/module.h>
  46 #include <linux/usb.h>
  47 #include <linux/usbdevice_fs.h>
  48 #include <linux/cdev.h>
  49 #include <linux/notifier.h>
  50 #include <linux/security.h>
  51 #include <asm/uaccess.h>
  52 #include <asm/byteorder.h>
  53 #include <linux/moduleparam.h>
  54
  55 #include "hcd.h"        /* for usbcore internals */
  56 #include "usb.h"
  57
  58 #define USB_MAXBUS                      64
  59 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
  60
  61 /* Mutual exclusion for removal, open, and release */
  62 DEFINE_MUTEX(usbfs_mutex);
  63
  64 struct async {
  65         struct list_head asynclist;
  66         struct dev_state *ps;
  67         struct pid *pid;
  68         uid_t uid, euid;
  69         unsigned int signr;
  70         unsigned int ifnum;
  71         void __user *userbuffer;
  72         void __user *userurb;
  73         struct urb *urb;
  74         int status;
  75         u32 secid;
  76 };
  77
  78 static int usbfs_snoop = 0;
  79 module_param (usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  80 MODULE_PARM_DESC (usbfs_snoop, "true to log all usbfs traffic");
  81
  82 #define snoop(dev, format, arg...)                              \
  83         do {                                                    \
  84                 if (usbfs_snoop)                                \
  85                         dev_info( dev , format , ## arg);       \
  86         } while (0)
  87
  88 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
  89
  90
  91 #define MAX_USBFS_BUFFER_SIZE   16384
  92
  93 static inline int connected (struct dev_state *ps)
  94 {
  95         return (!list_empty(&ps->list) &&
  96                         ps->dev->state != USB_STATE_NOTATTACHED);
  97 }
  98
  99 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
 100 {
 101         loff_t ret;
 102
 103         lock_kernel();
 104
 105         switch (orig) {
 106         case 0:
 107                 file->f_pos = offset;
 108                 ret = file->f_pos;
 109                 break;
 110         case 1:
 111                 file->f_pos += offset;
 112                 ret = file->f_pos;
 113                 break;
 114         case 2:
 115         default:
 116                 ret = -EINVAL;
 117         }
 118
 119         unlock_kernel();
 120         return ret;
 121 }
 122
 123 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
 124 {
 125         struct dev_state *ps = file->private_data;
 126         struct usb_device *dev = ps->dev;
 127         ssize_t ret = 0;
 128         unsigned len;
 129         loff_t pos;
 130         int i;
 131
 132         pos = *ppos;
 133         usb_lock_device(dev);
 134         if (!connected(ps)) {
 135                 ret = -ENODEV;
 136                 goto err;
 137         } else if (pos < 0) {
 138                 ret = -EINVAL;
 139                 goto err;
 140         }
 141
 142         if (pos < sizeof(struct usb_device_descriptor)) {
 143                 struct usb_device_descriptor temp_desc ; /* 18 bytes - fits on the stack */
 144
 145                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 146                 le16_to_cpus(&temp_desc.bcdUSB);
 147                 le16_to_cpus(&temp_desc.idVendor);
 148                 le16_to_cpus(&temp_desc.idProduct);
 149                 le16_to_cpus(&temp_desc.bcdDevice);
 150
 151                 len = sizeof(struct usb_device_descriptor) - pos;
 152                 if (len > nbytes)
 153                         len = nbytes;
 154                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 155                         ret = -EFAULT;
 156                         goto err;
 157                 }
 158
 159                 *ppos += len;
 160                 buf += len;
 161                 nbytes -= len;
 162                 ret += len;
 163         }
 164
 165         pos = sizeof(struct usb_device_descriptor);
 166         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 167                 struct usb_config_descriptor *config =
 168                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 169                 unsigned int length = le16_to_cpu(config->wTotalLength);
 170
 171                 if (*ppos < pos + length) {
 172
 173                         /* The descriptor may claim to be longer than it
 174                          * really is.  Here is the actual allocated length. */
 175                         unsigned alloclen =
 176                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 177
 178                         len = length - (*ppos - pos);
 179                         if (len > nbytes)
 180                                 len = nbytes;
 181
 182                         /* Simply don't write (skip over) unallocated parts */
 183                         if (alloclen > (*ppos - pos)) {
 184                                 alloclen -= (*ppos - pos);
 185                                 if (copy_to_user(buf,
 186                                     dev->rawdescriptors[i] + (*ppos - pos),
 187                                     min(len, alloclen))) {
 188                                         ret = -EFAULT;
 189                                         goto err;
 190                                 }
 191                         }
 192
 193                         *ppos += len;
 194                         buf += len;
 195                         nbytes -= len;
 196                         ret += len;
 197                 }
 198
 199                 pos += length;
 200         }
 201
 202 err:
 203         usb_unlock_device(dev);
 204         return ret;
 205 }
 206
 207 /*
 208  * async list handling
 209  */
 210
 211 static struct async *alloc_async(unsigned int numisoframes)
 212 {
 213         struct async *as;
 214
 215         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 216         if (!as)
 217                 return NULL;
 218         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 219         if (!as->urb) {
 220                 kfree(as);
 221                 return NULL;
 222         }
 223         return as;
 224 }
 225
 226 static void free_async(struct async *as)
 227 {
 228         put_pid(as->pid);
 229         kfree(as->urb->transfer_buffer);
 230         kfree(as->urb->setup_packet);
 231         usb_free_urb(as->urb);
 232         kfree(as);
 233 }
 234
 235 static inline void async_newpending(struct async *as)
 236 {
 237         struct dev_state *ps = as->ps;
 238         unsigned long flags;
 239
 240         spin_lock_irqsave(&ps->lock, flags);
 241         list_add_tail(&as->asynclist, &ps->async_pending);
 242         spin_unlock_irqrestore(&ps->lock, flags);
 243 }
 244
 245 static inline void async_removepending(struct async *as)
 246 {
 247         struct dev_state *ps = as->ps;
 248         unsigned long flags;
 249
 250         spin_lock_irqsave(&ps->lock, flags);
 251         list_del_init(&as->asynclist);
 252         spin_unlock_irqrestore(&ps->lock, flags);
 253 }
 254
 255 static inline struct async *async_getcompleted(struct dev_state *ps)
 256 {
 257         unsigned long flags;
 258         struct async *as = NULL;
 259
 260         spin_lock_irqsave(&ps->lock, flags);
 261         if (!list_empty(&ps->async_completed)) {
 262                 as = list_entry(ps->async_completed.next, struct async, asynclist);
 263                 list_del_init(&as->asynclist);
 264         }
 265         spin_unlock_irqrestore(&ps->lock, flags);
 266         return as;
 267 }
 268
 269 static inline struct async *async_getpending(struct dev_state *ps, void __user *userurb)
 270 {
 271         unsigned long flags;
 272         struct async *as;
 273
 274         spin_lock_irqsave(&ps->lock, flags);
 275         list_for_each_entry(as, &ps->async_pending, asynclist)
 276                 if (as->userurb == userurb) {
 277                         list_del_init(&as->asynclist);
 278                         spin_unlock_irqrestore(&ps->lock, flags);
 279                         return as;
 280                 }
 281         spin_unlock_irqrestore(&ps->lock, flags);
 282         return NULL;
 283 }
 284
 285 static void snoop_urb(struct urb *urb, void __user *userurb)
 286 {
 287         int j;
 288         unsigned char *data = urb->transfer_buffer;
 289
 290         if (!usbfs_snoop)
 291                 return;
 292
 293         dev_info(&urb->dev->dev, "direction=%s\n",
 294                         usb_urb_dir_in(urb) ? "IN" : "OUT");
 295         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
 296         dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
 297                  urb->transfer_buffer_length);
 298         dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
 299         dev_info(&urb->dev->dev, "data: ");
 300         for (j = 0; j < urb->transfer_buffer_length; ++j)
 301                 printk ("%02x ", data[j]);
 302         printk("\n");
 303 }
 304
 305 static void async_completed(struct urb *urb)
 306 {
 307         struct async *as = urb->context;
 308         struct dev_state *ps = as->ps;
 309         struct siginfo sinfo;
 310
 311         spin_lock(&ps->lock);
 312         list_move_tail(&as->asynclist, &ps->async_completed);
 313         spin_unlock(&ps->lock);
 314         as->status = urb->status;
 315         if (as->signr) {
 316                 sinfo.si_signo = as->signr;
 317                 sinfo.si_errno = as->status;
 318                 sinfo.si_code = SI_ASYNCIO;
 319                 sinfo.si_addr = as->userurb;
 320                 kill_pid_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
 321                                       as->euid, as->secid);
 322         }
 323         snoop(&urb->dev->dev, "urb complete\n");
 324         snoop_urb(urb, as->userurb);
 325         wake_up(&ps->wait);
 326 }
 327
 328 static void destroy_async (struct dev_state *ps, struct list_head *list)
 329 {
 330         struct async *as;
 331         unsigned long flags;
 332
 333         spin_lock_irqsave(&ps->lock, flags);
 334         while (!list_empty(list)) {
 335                 as = list_entry(list->next, struct async, asynclist);
 336                 list_del_init(&as->asynclist);
 337
 338                 /* drop the spinlock so the completion handler can run */
 339                 spin_unlock_irqrestore(&ps->lock, flags);
 340                 usb_kill_urb(as->urb);
 341                 spin_lock_irqsave(&ps->lock, flags);
 342         }
 343         spin_unlock_irqrestore(&ps->lock, flags);
 344         as = async_getcompleted(ps);
 345         while (as) {
 346                 free_async(as);
 347                 as = async_getcompleted(ps);
 348         }
 349 }
 350
 351 static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum)
 352 {
 353         struct list_head *p, *q, hitlist;
 354         unsigned long flags;
 355
 356         INIT_LIST_HEAD(&hitlist);
 357         spin_lock_irqsave(&ps->lock, flags);
 358         list_for_each_safe(p, q, &ps->async_pending)
 359                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 360                         list_move_tail(p, &hitlist);
 361         spin_unlock_irqrestore(&ps->lock, flags);
 362         destroy_async(ps, &hitlist);
 363 }
 364
 365 static inline void destroy_all_async(struct dev_state *ps)
 366 {
 367                 destroy_async(ps, &ps->async_pending);
 368 }
 369
 370 /*
 371  * interface claims are made only at the request of user level code,
 372  * which can also release them (explicitly or by closing files).
 373  * they're also undone when devices disconnect.
 374  */
 375
 376 static int driver_probe (struct usb_interface *intf,
 377                          const struct usb_device_id *id)
 378 {
 379         return -ENODEV;
 380 }
 381
 382 static void driver_disconnect(struct usb_interface *intf)
 383 {
 384         struct dev_state *ps = usb_get_intfdata (intf);
 385         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 386
 387         if (!ps)
 388                 return;
 389
 390         /* NOTE:  this relies on usbcore having canceled and completed
 391          * all pending I/O requests; 2.6 does that.
 392          */
 393
 394         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 395                 clear_bit(ifnum, &ps->ifclaimed);
 396         else
 397                 warn("interface number %u out of range", ifnum);
 398
 399         usb_set_intfdata (intf, NULL);
 400
 401         /* force async requests to complete */
 402         destroy_async_on_interface(ps, ifnum);
 403 }
 404
 405 /* The following routines are merely placeholders.  There is no way
 406  * to inform a user task about suspend or resumes.
 407  */
 408 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 409 {
 410         return 0;
 411 }
 412
 413 static int driver_resume(struct usb_interface *intf)
 414 {
 415         return 0;
 416 }
 417
 418 struct usb_driver usbfs_driver = {
 419         .name =         "usbfs",
 420         .probe =        driver_probe,
 421         .disconnect =   driver_disconnect,
 422         .suspend =      driver_suspend,
 423         .resume =       driver_resume,
 424 };
 425
 426 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 427 {
 428         struct usb_device *dev = ps->dev;
 429         struct usb_interface *intf;
 430         int err;
 431
 432         if (ifnum >= 8*sizeof(ps->ifclaimed))
 433                 return -EINVAL;
 434         /* already claimed */
 435         if (test_bit(ifnum, &ps->ifclaimed))
 436                 return 0;
 437
 438         intf = usb_ifnum_to_if(dev, ifnum);
 439         if (!intf)
 440                 err = -ENOENT;
 441         else
 442                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 443         if (err == 0)
 444                 set_bit(ifnum, &ps->ifclaimed);
 445         return err;
 446 }
 447
 448 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 449 {
 450         struct usb_device *dev;
 451         struct usb_interface *intf;
 452         int err;
 453
 454         err = -EINVAL;
 455         if (ifnum >= 8*sizeof(ps->ifclaimed))
 456                 return err;
 457         dev = ps->dev;
 458         intf = usb_ifnum_to_if(dev, ifnum);
 459         if (!intf)
 460                 err = -ENOENT;
 461         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 462                 usb_driver_release_interface(&usbfs_driver, intf);
 463                 err = 0;
 464         }
 465         return err;
 466 }
 467
 468 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 469 {
 470         if (ps->dev->state != USB_STATE_CONFIGURED)
 471                 return -EHOSTUNREACH;
 472         if (ifnum >= 8*sizeof(ps->ifclaimed))
 473                 return -EINVAL;
 474         if (test_bit(ifnum, &ps->ifclaimed))
 475                 return 0;
 476         /* if not yet claimed, claim it for the driver */
 477         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n",
 478                task_pid_nr(current), current->comm, ifnum);
 479         return claimintf(ps, ifnum);
 480 }
 481
 482 static int findintfep(struct usb_device *dev, unsigned int ep)
 483 {
 484         unsigned int i, j, e;
 485         struct usb_interface *intf;
 486         struct usb_host_interface *alts;
 487         struct usb_endpoint_descriptor *endpt;
 488
 489         if (ep & ~(USB_DIR_IN|0xf))
 490                 return -EINVAL;
 491         if (!dev->actconfig)
 492                 return -ESRCH;
 493         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 494                 intf = dev->actconfig->interface[i];
 495                 for (j = 0; j < intf->num_altsetting; j++) {
 496                         alts = &intf->altsetting[j];
 497                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 498                                 endpt = &alts->endpoint[e].desc;
 499                                 if (endpt->bEndpointAddress == ep)
 500                                         return alts->desc.bInterfaceNumber;
 501                         }
 502                 }
 503         }
 504         return -ENOENT;
 505 }
 506
 507 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
 508 {
 509         int ret = 0;
 510
 511         if (ps->dev->state != USB_STATE_ADDRESS
 512          && ps->dev->state != USB_STATE_CONFIGURED)
 513                 return -EHOSTUNREACH;
 514         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 515                 return 0;
 516
 517         index &= 0xff;
 518         switch (requesttype & USB_RECIP_MASK) {
 519         case USB_RECIP_ENDPOINT:
 520                 if ((ret = findintfep(ps->dev, index)) >= 0)
 521                         ret = checkintf(ps, ret);
 522                 break;
 523
 524         case USB_RECIP_INTERFACE:
 525                 ret = checkintf(ps, index);
 526                 break;
 527         }
 528         return ret;
 529 }
 530
 531 static int __match_minor(struct device *dev, void *data)
 532 {
 533         int minor = *((int *)data);
 534
 535         if (dev->devt == MKDEV(USB_DEVICE_MAJOR, minor))
 536                 return 1;
 537         return 0;
 538 }
 539
 540 static struct usb_device *usbdev_lookup_by_minor(int minor)
 541 {
 542         struct device *dev;
 543
 544         dev = bus_find_device(&usb_bus_type, NULL, &minor, __match_minor);
 545         if (!dev)
 546                 return NULL;
 547         put_device(dev);
 548         return container_of(dev, struct usb_device, dev);
 549 }
 550
 551 /*
 552  * file operations
 553  */
 554 static int usbdev_open(struct inode *inode, struct file *file)
 555 {
 556         struct usb_device *dev = NULL;
 557         struct dev_state *ps;
 558         int ret;
 559
 560         /* Protect against simultaneous removal or release */
 561         mutex_lock(&usbfs_mutex);
 562
 563         ret = -ENOMEM;
 564         if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
 565                 goto out;
 566
 567         ret = -ENOENT;
 568         /* usbdev device-node */
 569         if (imajor(inode) == USB_DEVICE_MAJOR)
 570                 dev = usbdev_lookup_by_minor(iminor(inode));
 571 #ifdef CONFIG_USB_DEVICEFS
 572         /* procfs file */
 573         if (!dev)
 574                 dev = inode->i_private;
 575 #endif
 576         if (!dev)
 577                 goto out;
 578         ret = usb_autoresume_device(dev);
 579         if (ret)
 580                 goto out;
 581
 582         usb_get_dev(dev);
 583         ret = 0;
 584         ps->dev = dev;
 585         ps->file = file;
 586         spin_lock_init(&ps->lock);
 587         INIT_LIST_HEAD(&ps->list);
 588         INIT_LIST_HEAD(&ps->async_pending);
 589         INIT_LIST_HEAD(&ps->async_completed);
 590         init_waitqueue_head(&ps->wait);
 591         ps->discsignr = 0;
 592         ps->disc_pid = get_pid(task_pid(current));
 593         ps->disc_uid = current->uid;
 594         ps->disc_euid = current->euid;
 595         ps->disccontext = NULL;
 596         ps->ifclaimed = 0;
 597         security_task_getsecid(current, &ps->secid);
 598         smp_wmb();
 599         list_add_tail(&ps->list, &dev->filelist);
 600         file->private_data = ps;
 601  out:
 602         if (ret)
 603                 kfree(ps);
 604         mutex_unlock(&usbfs_mutex);
 605         return ret;
 606 }
 607
 608 static int usbdev_release(struct inode *inode, struct file *file)
 609 {
 610         struct dev_state *ps = file->private_data;
 611         struct usb_device *dev = ps->dev;
 612         unsigned int ifnum;
 613
 614         usb_lock_device(dev);
 615
 616         /* Protect against simultaneous open */
 617         mutex_lock(&usbfs_mutex);
 618         list_del_init(&ps->list);
 619         mutex_unlock(&usbfs_mutex);
 620
 621         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 622                         ifnum++) {
 623                 if (test_bit(ifnum, &ps->ifclaimed))
 624                         releaseintf(ps, ifnum);
 625         }
 626         destroy_all_async(ps);
 627         usb_autosuspend_device(dev);
 628         usb_unlock_device(dev);
 629         usb_put_dev(dev);
 630         put_pid(ps->disc_pid);
 631         kfree(ps);
 632         return 0;
 633 }
 634
 635 static int proc_control(struct dev_state *ps, void __user *arg)
 636 {
 637         struct usb_device *dev = ps->dev;
 638         struct usbdevfs_ctrltransfer ctrl;
 639         unsigned int tmo;
 640         unsigned char *tbuf;
 641         int i, j, ret;
 642
 643         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 644                 return -EFAULT;
 645         if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
 646                 return ret;
 647         if (ctrl.wLength > PAGE_SIZE)
 648                 return -EINVAL;
 649         if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
 650                 return -ENOMEM;
 651         tmo = ctrl.timeout;
 652         if (ctrl.bRequestType & 0x80) {
 653                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
 654                         free_page((unsigned long)tbuf);
 655                         return -EINVAL;
 656                 }
 657                 snoop(&dev->dev, "control read: bRequest=%02x "
 658                                 "bRrequestType=%02x wValue=%04x "
 659                                 "wIndex=%04x wLength=%04x\n",
 660                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 661                                 ctrl.wIndex, ctrl.wLength);
 662
 663                 usb_unlock_device(dev);
 664                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 665                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 666                 usb_lock_device(dev);
 667                 if ((i > 0) && ctrl.wLength) {
 668                         if (usbfs_snoop) {
 669                                 dev_info(&dev->dev, "control read: data ");
 670                                 for (j = 0; j < i; ++j)
 671                                         printk("%02x ", (unsigned char)(tbuf)[j]);
 672                                 printk("\n");
 673                         }
 674                         if (copy_to_user(ctrl.data, tbuf, i)) {
 675                                 free_page((unsigned long)tbuf);
 676                                 return -EFAULT;
 677                         }
 678                 }
 679         } else {
 680                 if (ctrl.wLength) {
 681                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 682                                 free_page((unsigned long)tbuf);
 683                                 return -EFAULT;
 684                         }
 685                 }
 686                 snoop(&dev->dev, "control write: bRequest=%02x "
 687                                 "bRrequestType=%02x wValue=%04x "
 688                                 "wIndex=%04x wLength=%04x\n",
 689                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 690                                 ctrl.wIndex, ctrl.wLength);
 691                 if (usbfs_snoop) {
 692                         dev_info(&dev->dev, "control write: data: ");
 693                         for (j = 0; j < ctrl.wLength; ++j)
 694                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 695                         printk("\n");
 696                 }
 697                 usb_unlock_device(dev);
 698                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 699                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 700                 usb_lock_device(dev);
 701         }
 702         free_page((unsigned long)tbuf);
 703         if (i<0 && i != -EPIPE) {
 704                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 705                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 706                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 707                            ctrl.wLength, i);
 708         }
 709         return i;
 710 }
 711
 712 static int proc_bulk(struct dev_state *ps, void __user *arg)
 713 {
 714         struct usb_device *dev = ps->dev;
 715         struct usbdevfs_bulktransfer bulk;
 716         unsigned int tmo, len1, pipe;
 717         int len2;
 718         unsigned char *tbuf;
 719         int i, j, ret;
 720
 721         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 722                 return -EFAULT;
 723         if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
 724                 return ret;
 725         if ((ret = checkintf(ps, ret)))
 726                 return ret;
 727         if (bulk.ep & USB_DIR_IN)
 728                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 729         else
 730                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 731         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 732                 return -EINVAL;
 733         len1 = bulk.len;
 734         if (len1 > MAX_USBFS_BUFFER_SIZE)
 735                 return -EINVAL;
 736         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 737                 return -ENOMEM;
 738         tmo = bulk.timeout;
 739         if (bulk.ep & 0x80) {
 740                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 741                         kfree(tbuf);
 742                         return -EINVAL;
 743                 }
 744                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
 745                         bulk.len, bulk.timeout);
 746                 usb_unlock_device(dev);
 747                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 748                 usb_lock_device(dev);
 749                 if (!i && len2) {
 750                         if (usbfs_snoop) {
 751                                 dev_info(&dev->dev, "bulk read: data ");
 752                                 for (j = 0; j < len2; ++j)
 753                                         printk("%02x ", (unsigned char)(tbuf)[j]);
 754                                 printk("\n");
 755                         }
 756                         if (copy_to_user(bulk.data, tbuf, len2)) {
 757                                 kfree(tbuf);
 758                                 return -EFAULT;
 759                         }
 760                 }
 761         } else {
 762                 if (len1) {
 763                         if (copy_from_user(tbuf, bulk.data, len1)) {
 764                                 kfree(tbuf);
 765                                 return -EFAULT;
 766                         }
 767                 }
 768                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
 769                         bulk.len, bulk.timeout);
 770                 if (usbfs_snoop) {
 771                         dev_info(&dev->dev, "bulk write: data: ");
 772                         for (j = 0; j < len1; ++j)
 773                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 774                         printk("\n");
 775                 }
 776                 usb_unlock_device(dev);
 777                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 778                 usb_lock_device(dev);
 779         }
 780         kfree(tbuf);
 781         if (i < 0)
 782                 return i;
 783         return len2;
 784 }
 785
 786 static int proc_resetep(struct dev_state *ps, void __user *arg)
 787 {
 788         unsigned int ep;
 789         int ret;
 790
 791         if (get_user(ep, (unsigned int __user *)arg))
 792                 return -EFAULT;
 793         if ((ret = findintfep(ps->dev, ep)) < 0)
 794                 return ret;
 795         if ((ret = checkintf(ps, ret)))
 796                 return ret;
 797         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
 798         return 0;
 799 }
 800
 801 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 802 {
 803         unsigned int ep;
 804         int pipe;
 805         int ret;
 806
 807         if (get_user(ep, (unsigned int __user *)arg))
 808                 return -EFAULT;
 809         if ((ret = findintfep(ps->dev, ep)) < 0)
 810                 return ret;
 811         if ((ret = checkintf(ps, ret)))
 812                 return ret;
 813         if (ep & USB_DIR_IN)
 814                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 815         else
 816                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 817
 818         return usb_clear_halt(ps->dev, pipe);
 819 }
 820
 821
 822 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 823 {
 824         struct usbdevfs_getdriver gd;
 825         struct usb_interface *intf;
 826         int ret;
 827
 828         if (copy_from_user(&gd, arg, sizeof(gd)))
 829                 return -EFAULT;
 830         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 831         if (!intf || !intf->dev.driver)
 832                 ret = -ENODATA;
 833         else {
 834                 strncpy(gd.driver, intf->dev.driver->name,
 835                                 sizeof(gd.driver));
 836                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 837         }
 838         return ret;
 839 }
 840
 841 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 842 {
 843         struct usbdevfs_connectinfo ci;
 844
 845         ci.devnum = ps->dev->devnum;
 846         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 847         if (copy_to_user(arg, &ci, sizeof(ci)))
 848                 return -EFAULT;
 849         return 0;
 850 }
 851
 852 static int proc_resetdevice(struct dev_state *ps)
 853 {
 854         return usb_reset_composite_device(ps->dev, NULL);
 855 }
 856
 857 static int proc_setintf(struct dev_state *ps, void __user *arg)
 858 {
 859         struct usbdevfs_setinterface setintf;
 860         int ret;
 861
 862         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 863                 return -EFAULT;
 864         if ((ret = checkintf(ps, setintf.interface)))
 865                 return ret;
 866         return usb_set_interface(ps->dev, setintf.interface,
 867                         setintf.altsetting);
 868 }
 869
 870 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 871 {
 872         int u;
 873         int status = 0;
 874         struct usb_host_config *actconfig;
 875
 876         if (get_user(u, (int __user *)arg))
 877                 return -EFAULT;
 878
 879         actconfig = ps->dev->actconfig;
 880
 881         /* Don't touch the device if any interfaces are claimed.
 882          * It could interfere with other drivers' operations, and if
 883          * an interface is claimed by usbfs it could easily deadlock.
 884          */
 885         if (actconfig) {
 886                 int i;
 887
 888                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 889                         if (usb_interface_claimed(actconfig->interface[i])) {
 890                                 dev_warn (&ps->dev->dev,
 891                                         "usbfs: interface %d claimed by %s "
 892                                         "while '%s' sets config #%d\n",
 893                                         actconfig->interface[i]
 894                                                 ->cur_altsetting
 895                                                 ->desc.bInterfaceNumber,
 896                                         actconfig->interface[i]
 897                                                 ->dev.driver->name,
 898                                         current->comm, u);
 899                                 status = -EBUSY;
 900                                 break;
 901                         }
 902                 }
 903         }
 904
 905         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 906          * so avoid usb_set_configuration()'s kick to sysfs
 907          */
 908         if (status == 0) {
 909                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 910                         status = usb_reset_configuration(ps->dev);
 911                 else
 912                         status = usb_set_configuration(ps->dev, u);
 913         }
 914
 915         return status;
 916 }
 917
 918 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 919                              struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
 920                              void __user *arg)
 921 {
 922         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 923         struct usb_host_endpoint *ep;
 924         struct async *as;
 925         struct usb_ctrlrequest *dr = NULL;
 926         unsigned int u, totlen, isofrmlen;
 927         int ret, ifnum = -1;
 928         int is_in;
 929
 930         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
 931                            URB_NO_FSBR|URB_ZERO_PACKET))
 932                 return -EINVAL;
 933         if (!uurb->buffer)
 934                 return -EINVAL;
 935         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
 936                 return -EINVAL;
 937         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
 938                 if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
 939                         return ifnum;
 940                 if ((ret = checkintf(ps, ifnum)))
 941                         return ret;
 942         }
 943         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
 944                 is_in = 1;
 945                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 946         } else {
 947                 is_in = 0;
 948                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 949         }
 950         if (!ep)
 951                 return -ENOENT;
 952         switch(uurb->type) {
 953         case USBDEVFS_URB_TYPE_CONTROL:
 954                 if (!usb_endpoint_xfer_control(&ep->desc))
 955                         return -EINVAL;
 956                 /* min 8 byte setup packet, max 8 byte setup plus an arbitrary data stage */
 957                 if (uurb->buffer_length < 8 || uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
 958                         return -EINVAL;
 959                 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
 960                         return -ENOMEM;
 961                 if (copy_from_user(dr, uurb->buffer, 8)) {
 962                         kfree(dr);
 963                         return -EFAULT;
 964                 }
 965                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
 966                         kfree(dr);
 967                         return -EINVAL;
 968                 }
 969                 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
 970                         kfree(dr);
 971                         return ret;
 972                 }
 973                 uurb->number_of_packets = 0;
 974                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
 975                 uurb->buffer += 8;
 976                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
 977                         is_in = 1;
 978                         uurb->endpoint |= USB_DIR_IN;
 979                 } else {
 980                         is_in = 0;
 981                         uurb->endpoint &= ~USB_DIR_IN;
 982                 }
 983                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
 984                                 uurb->buffer, uurb->buffer_length)) {
 985                         kfree(dr);
 986                         return -EFAULT;
 987                 }
 988                 snoop(&ps->dev->dev, "control urb: bRequest=%02x "
 989                         "bRrequestType=%02x wValue=%04x "
 990                         "wIndex=%04x wLength=%04x\n",
 991                         dr->bRequest, dr->bRequestType,
 992                         __le16_to_cpup(&dr->wValue),
 993                         __le16_to_cpup(&dr->wIndex),
 994                         __le16_to_cpup(&dr->wLength));
 995                 break;
 996
 997         case USBDEVFS_URB_TYPE_BULK:
 998                 switch (usb_endpoint_type(&ep->desc)) {
 999                 case USB_ENDPOINT_XFER_CONTROL:
1000                 case USB_ENDPOINT_XFER_ISOC:
1001                         return -EINVAL;
1002                 /* allow single-shot interrupt transfers, at bogus rates */
1003                 }
1004                 uurb->number_of_packets = 0;
1005                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1006                         return -EINVAL;
1007                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1008                                 uurb->buffer, uurb->buffer_length))
1009                         return -EFAULT;
1010                 snoop(&ps->dev->dev, "bulk urb\n");
1011                 break;
1012
1013         case USBDEVFS_URB_TYPE_ISO:
1014                 /* arbitrary limit */
1015                 if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
1016                         return -EINVAL;
1017                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1018                         return -EINVAL;
1019                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
1020                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1021                         return -ENOMEM;
1022                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1023                         kfree(isopkt);
1024                         return -EFAULT;
1025                 }
1026                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1027                         /* arbitrary limit, sufficient for USB 2.0 high-bandwidth iso */
1028                         if (isopkt[u].length > 8192) {
1029                                 kfree(isopkt);
1030                                 return -EINVAL;
1031                         }
1032                         totlen += isopkt[u].length;
1033                 }
1034                 if (totlen > 32768) {
1035                         kfree(isopkt);
1036                         return -EINVAL;
1037                 }
1038                 uurb->buffer_length = totlen;
1039                 snoop(&ps->dev->dev, "iso urb\n");
1040                 break;
1041
1042         case USBDEVFS_URB_TYPE_INTERRUPT:
1043                 uurb->number_of_packets = 0;
1044                 if (!usb_endpoint_xfer_int(&ep->desc))
1045                         return -EINVAL;
1046                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1047                         return -EINVAL;
1048                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1049                                 uurb->buffer, uurb->buffer_length))
1050                         return -EFAULT;
1051                 snoop(&ps->dev->dev, "interrupt urb\n");
1052                 break;
1053
1054         default:
1055                 return -EINVAL;
1056         }
1057         if (!(as = alloc_async(uurb->number_of_packets))) {
1058                 kfree(isopkt);
1059                 kfree(dr);
1060                 return -ENOMEM;
1061         }
1062         if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
1063                 kfree(isopkt);
1064                 kfree(dr);
1065                 free_async(as);
1066                 return -ENOMEM;
1067         }
1068         as->urb->dev = ps->dev;
1069         as->urb->pipe = (uurb->type << 30) |
1070                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1071                         (uurb->endpoint & USB_DIR_IN);
1072         as->urb->transfer_flags = uurb->flags |
1073                         (is_in ? URB_DIR_IN : URB_DIR_OUT);
1074         as->urb->transfer_buffer_length = uurb->buffer_length;
1075         as->urb->setup_packet = (unsigned char*)dr;
1076         as->urb->start_frame = uurb->start_frame;
1077         as->urb->number_of_packets = uurb->number_of_packets;
1078         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1079                         ps->dev->speed == USB_SPEED_HIGH)
1080                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1081         else
1082                 as->urb->interval = ep->desc.bInterval;
1083         as->urb->context = as;
1084         as->urb->complete = async_completed;
1085         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1086                 as->urb->iso_frame_desc[u].offset = totlen;
1087                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1088                 totlen += isopkt[u].length;
1089         }
1090         kfree(isopkt);
1091         as->ps = ps;
1092         as->userurb = arg;
1093         if (uurb->endpoint & USB_DIR_IN)
1094                 as->userbuffer = uurb->buffer;
1095         else
1096                 as->userbuffer = NULL;
1097         as->signr = uurb->signr;
1098         as->ifnum = ifnum;
1099         as->pid = get_pid(task_pid(current));
1100         as->uid = current->uid;
1101         as->euid = current->euid;
1102         security_task_getsecid(current, &as->secid);
1103         if (!is_in) {
1104                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1105                                 as->urb->transfer_buffer_length)) {
1106                         free_async(as);
1107                         return -EFAULT;
1108                 }
1109         }
1110         snoop_urb(as->urb, as->userurb);
1111         async_newpending(as);
1112         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1113                 dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
1114                 async_removepending(as);
1115                 free_async(as);
1116                 return ret;
1117         }
1118         return 0;
1119 }
1120
1121 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1122 {
1123         struct usbdevfs_urb uurb;
1124
1125         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1126                 return -EFAULT;
1127
1128         return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg);
1129 }
1130
1131 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1132 {
1133         struct async *as;
1134
1135         as = async_getpending(ps, arg);
1136         if (!as)
1137                 return -EINVAL;
1138         usb_kill_urb(as->urb);
1139         return 0;
1140 }
1141
1142 static int processcompl(struct async *as, void __user * __user *arg)
1143 {
1144         struct urb *urb = as->urb;
1145         struct usbdevfs_urb __user *userurb = as->userurb;
1146         void __user *addr = as->userurb;
1147         unsigned int i;
1148
1149         if (as->userbuffer)
1150                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1151                         return -EFAULT;
1152         if (put_user(as->status, &userurb->status))
1153                 return -EFAULT;
1154         if (put_user(urb->actual_length, &userurb->actual_length))
1155                 return -EFAULT;
1156         if (put_user(urb->error_count, &userurb->error_count))
1157                 return -EFAULT;
1158
1159         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1160                 for (i = 0; i < urb->number_of_packets; i++) {
1161                         if (put_user(urb->iso_frame_desc[i].actual_length,
1162                                      &userurb->iso_frame_desc[i].actual_length))
1163                                 return -EFAULT;
1164                         if (put_user(urb->iso_frame_desc[i].status,
1165                                      &userurb->iso_frame_desc[i].status))
1166                                 return -EFAULT;
1167                 }
1168         }
1169
1170         free_async(as);
1171
1172         if (put_user(addr, (void __user * __user *)arg))
1173                 return -EFAULT;
1174         return 0;
1175 }
1176
1177 static struct async* reap_as(struct dev_state *ps)
1178 {
1179         DECLARE_WAITQUEUE(wait, current);
1180         struct async *as = NULL;
1181         struct usb_device *dev = ps->dev;
1182
1183         add_wait_queue(&ps->wait, &wait);
1184         for (;;) {
1185                 __set_current_state(TASK_INTERRUPTIBLE);
1186                 if ((as = async_getcompleted(ps)))
1187                         break;
1188                 if (signal_pending(current))
1189                         break;
1190                 usb_unlock_device(dev);
1191                 schedule();
1192                 usb_lock_device(dev);
1193         }
1194         remove_wait_queue(&ps->wait, &wait);
1195         set_current_state(TASK_RUNNING);
1196         return as;
1197 }
1198
1199 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1200 {
1201         struct async *as = reap_as(ps);
1202         if (as)
1203                 return processcompl(as, (void __user * __user *)arg);
1204         if (signal_pending(current))
1205                 return -EINTR;
1206         return -EIO;
1207 }
1208
1209 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1210 {
1211         struct async *as;
1212
1213         if (!(as = async_getcompleted(ps)))
1214                 return -EAGAIN;
1215         return processcompl(as, (void __user * __user *)arg);
1216 }
1217
1218 #ifdef CONFIG_COMPAT
1219
1220 static int get_urb32(struct usbdevfs_urb *kurb,
1221                      struct usbdevfs_urb32 __user *uurb)
1222 {
1223         __u32  uptr;
1224         if (get_user(kurb->type, &uurb->type) ||
1225             __get_user(kurb->endpoint, &uurb->endpoint) ||
1226             __get_user(kurb->status, &uurb->status) ||
1227             __get_user(kurb->flags, &uurb->flags) ||
1228             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1229             __get_user(kurb->actual_length, &uurb->actual_length) ||
1230             __get_user(kurb->start_frame, &uurb->start_frame) ||
1231             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1232             __get_user(kurb->error_count, &uurb->error_count) ||
1233             __get_user(kurb->signr, &uurb->signr))
1234                 return -EFAULT;
1235
1236         if (__get_user(uptr, &uurb->buffer))
1237                 return -EFAULT;
1238         kurb->buffer = compat_ptr(uptr);
1239         if (__get_user(uptr, &uurb->buffer))
1240                 return -EFAULT;
1241         kurb->usercontext = compat_ptr(uptr);
1242
1243         return 0;
1244 }
1245
1246 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1247 {
1248         struct usbdevfs_urb uurb;
1249
1250         if (get_urb32(&uurb,(struct usbdevfs_urb32 __user *)arg))
1251                 return -EFAULT;
1252
1253         return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg);
1254 }
1255
1256 static int processcompl_compat(struct async *as, void __user * __user *arg)
1257 {
1258         struct urb *urb = as->urb;
1259         struct usbdevfs_urb32 __user *userurb = as->userurb;
1260         void __user *addr = as->userurb;
1261         unsigned int i;
1262
1263         if (as->userbuffer)
1264                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1265                         return -EFAULT;
1266         if (put_user(as->status, &userurb->status))
1267                 return -EFAULT;
1268         if (put_user(urb->actual_length, &userurb->actual_length))
1269                 return -EFAULT;
1270         if (put_user(urb->error_count, &userurb->error_count))
1271                 return -EFAULT;
1272
1273         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1274                 for (i = 0; i < urb->number_of_packets; i++) {
1275                         if (put_user(urb->iso_frame_desc[i].actual_length,
1276                                      &userurb->iso_frame_desc[i].actual_length))
1277                                 return -EFAULT;
1278                         if (put_user(urb->iso_frame_desc[i].status,
1279                                      &userurb->iso_frame_desc[i].status))
1280                                 return -EFAULT;
1281                 }
1282         }
1283
1284         free_async(as);
1285         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1286                 return -EFAULT;
1287         return 0;
1288 }
1289
1290 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1291 {
1292         struct async *as = reap_as(ps);
1293         if (as)
1294                 return processcompl_compat(as, (void __user * __user *)arg);
1295         if (signal_pending(current))
1296                 return -EINTR;
1297         return -EIO;
1298 }
1299
1300 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1301 {
1302         struct async *as;
1303
1304         if (!(as = async_getcompleted(ps)))
1305                 return -EAGAIN;
1306         return processcompl_compat(as, (void __user * __user *)arg);
1307 }
1308
1309 #endif
1310
1311 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1312 {
1313         struct usbdevfs_disconnectsignal ds;
1314
1315         if (copy_from_user(&ds, arg, sizeof(ds)))
1316                 return -EFAULT;
1317         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1318                 return -EINVAL;
1319         ps->discsignr = ds.signr;
1320         ps->disccontext = ds.context;
1321         return 0;
1322 }
1323
1324 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1325 {
1326         unsigned int ifnum;
1327
1328         if (get_user(ifnum, (unsigned int __user *)arg))
1329                 return -EFAULT;
1330         return claimintf(ps, ifnum);
1331 }
1332
1333 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1334 {
1335         unsigned int ifnum;
1336         int ret;
1337
1338         if (get_user(ifnum, (unsigned int __user *)arg))
1339                 return -EFAULT;
1340         if ((ret = releaseintf(ps, ifnum)) < 0)
1341                 return ret;
1342         destroy_async_on_interface (ps, ifnum);
1343         return 0;
1344 }
1345
1346 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1347 {
1348         int                     size;
1349         void                    *buf = NULL;
1350         int                     retval = 0;
1351         struct usb_interface    *intf = NULL;
1352         struct usb_driver       *driver = NULL;
1353
1354         /* alloc buffer */
1355         if ((size = _IOC_SIZE (ctl->ioctl_code)) > 0) {
1356                 if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
1357                         return -ENOMEM;
1358                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1359                         if (copy_from_user (buf, ctl->data, size)) {
1360                                 kfree(buf);
1361                                 return -EFAULT;
1362                         }
1363                 } else {
1364                         memset (buf, 0, size);
1365                 }
1366         }
1367
1368         if (!connected(ps)) {
1369                 kfree(buf);
1370                 return -ENODEV;
1371         }
1372
1373         if (ps->dev->state != USB_STATE_CONFIGURED)
1374                 retval = -EHOSTUNREACH;
1375         else if (!(intf = usb_ifnum_to_if (ps->dev, ctl->ifno)))
1376                retval = -EINVAL;
1377         else switch (ctl->ioctl_code) {
1378
1379         /* disconnect kernel driver from interface */
1380         case USBDEVFS_DISCONNECT:
1381                 if (intf->dev.driver) {
1382                         driver = to_usb_driver(intf->dev.driver);
1383                         dev_dbg (&intf->dev, "disconnect by usbfs\n");
1384                         usb_driver_release_interface(driver, intf);
1385                 } else
1386                         retval = -ENODATA;
1387                 break;
1388
1389         /* let kernel drivers try to (re)bind to the interface */
1390         case USBDEVFS_CONNECT:
1391                 if (!intf->dev.driver)
1392                         retval = device_attach(&intf->dev);
1393                 else
1394                         retval = -EBUSY;
1395                 break;
1396
1397         /* talk directly to the interface's driver */
1398         default:
1399                 if (intf->dev.driver)
1400                         driver = to_usb_driver(intf->dev.driver);
1401                 if (driver == NULL || driver->ioctl == NULL) {
1402                         retval = -ENOTTY;
1403                 } else {
1404                         retval = driver->ioctl (intf, ctl->ioctl_code, buf);
1405                         if (retval == -ENOIOCTLCMD)
1406                                 retval = -ENOTTY;
1407                 }
1408         }
1409
1410         /* cleanup and return */
1411         if (retval >= 0
1412                         && (_IOC_DIR (ctl->ioctl_code) & _IOC_READ) != 0
1413                         && size > 0
1414                         && copy_to_user (ctl->data, buf, size) != 0)
1415                 retval = -EFAULT;
1416
1417         kfree(buf);
1418         return retval;
1419 }
1420
1421 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1422 {
1423         struct usbdevfs_ioctl   ctrl;
1424
1425         if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
1426                 return -EFAULT;
1427         return proc_ioctl(ps, &ctrl);
1428 }
1429
1430 #ifdef CONFIG_COMPAT
1431 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1432 {
1433         struct usbdevfs_ioctl32 __user *uioc;
1434         struct usbdevfs_ioctl ctrl;
1435         u32 udata;
1436
1437         uioc = compat_ptr((long)arg);
1438         if (get_user(ctrl.ifno, &uioc->ifno) ||
1439             get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1440             __get_user(udata, &uioc->data))
1441                 return -EFAULT;
1442         ctrl.data = compat_ptr(udata);
1443
1444         return proc_ioctl(ps, &ctrl);
1445 }
1446 #endif
1447
1448 /*
1449  * NOTE:  All requests here that have interface numbers as parameters
1450  * are assuming that somehow the configuration has been prevented from
1451  * changing.  But there's no mechanism to ensure that...
1452  */
1453 static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1454 {
1455         struct dev_state *ps = file->private_data;
1456         struct usb_device *dev = ps->dev;
1457         void __user *p = (void __user *)arg;
1458         int ret = -ENOTTY;
1459
1460         if (!(file->f_mode & FMODE_WRITE))
1461                 return -EPERM;
1462         usb_lock_device(dev);
1463         if (!connected(ps)) {
1464                 usb_unlock_device(dev);
1465                 return -ENODEV;
1466         }
1467
1468         switch (cmd) {
1469         case USBDEVFS_CONTROL:
1470                 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
1471                 ret = proc_control(ps, p);
1472                 if (ret >= 0)
1473                         inode->i_mtime = CURRENT_TIME;
1474                 break;
1475
1476         case USBDEVFS_BULK:
1477                 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
1478                 ret = proc_bulk(ps, p);
1479                 if (ret >= 0)
1480                         inode->i_mtime = CURRENT_TIME;
1481                 break;
1482
1483         case USBDEVFS_RESETEP:
1484                 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
1485                 ret = proc_resetep(ps, p);
1486                 if (ret >= 0)
1487                         inode->i_mtime = CURRENT_TIME;
1488                 break;
1489
1490         case USBDEVFS_RESET:
1491                 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
1492                 ret = proc_resetdevice(ps);
1493                 break;
1494
1495         case USBDEVFS_CLEAR_HALT:
1496                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
1497                 ret = proc_clearhalt(ps, p);
1498                 if (ret >= 0)
1499                         inode->i_mtime = CURRENT_TIME;
1500                 break;
1501
1502         case USBDEVFS_GETDRIVER:
1503                 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
1504                 ret = proc_getdriver(ps, p);
1505                 break;
1506
1507         case USBDEVFS_CONNECTINFO:
1508                 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
1509                 ret = proc_connectinfo(ps, p);
1510                 break;
1511
1512         case USBDEVFS_SETINTERFACE:
1513                 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
1514                 ret = proc_setintf(ps, p);
1515                 break;
1516
1517         case USBDEVFS_SETCONFIGURATION:
1518                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
1519                 ret = proc_setconfig(ps, p);
1520                 break;
1521
1522         case USBDEVFS_SUBMITURB:
1523                 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
1524                 ret = proc_submiturb(ps, p);
1525                 if (ret >= 0)
1526                         inode->i_mtime = CURRENT_TIME;
1527                 break;
1528
1529 #ifdef CONFIG_COMPAT
1530
1531         case USBDEVFS_SUBMITURB32:
1532                 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
1533                 ret = proc_submiturb_compat(ps, p);
1534                 if (ret >= 0)
1535                         inode->i_mtime = CURRENT_TIME;
1536                 break;
1537
1538         case USBDEVFS_REAPURB32:
1539                 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
1540                 ret = proc_reapurb_compat(ps, p);
1541                 break;
1542
1543         case USBDEVFS_REAPURBNDELAY32:
1544                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
1545                 ret = proc_reapurbnonblock_compat(ps, p);
1546                 break;
1547
1548         case USBDEVFS_IOCTL32:
1549                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1550                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1551                 break;
1552 #endif
1553
1554         case USBDEVFS_DISCARDURB:
1555                 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
1556                 ret = proc_unlinkurb(ps, p);
1557                 break;
1558
1559         case USBDEVFS_REAPURB:
1560                 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
1561                 ret = proc_reapurb(ps, p);
1562                 break;
1563
1564         case USBDEVFS_REAPURBNDELAY:
1565                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
1566                 ret = proc_reapurbnonblock(ps, p);
1567                 break;
1568
1569         case USBDEVFS_DISCSIGNAL:
1570                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
1571                 ret = proc_disconnectsignal(ps, p);
1572                 break;
1573
1574         case USBDEVFS_CLAIMINTERFACE:
1575                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
1576                 ret = proc_claiminterface(ps, p);
1577                 break;
1578
1579         case USBDEVFS_RELEASEINTERFACE:
1580                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
1581                 ret = proc_releaseinterface(ps, p);
1582                 break;
1583
1584         case USBDEVFS_IOCTL:
1585                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1586                 ret = proc_ioctl_default(ps, p);
1587                 break;
1588         }
1589         usb_unlock_device(dev);
1590         if (ret >= 0)
1591                 inode->i_atime = CURRENT_TIME;
1592         return ret;
1593 }
1594
1595 /* No kernel lock - fine */
1596 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
1597 {
1598         struct dev_state *ps = file->private_data;
1599         unsigned int mask = 0;
1600
1601         poll_wait(file, &ps->wait, wait);
1602         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1603                 mask |= POLLOUT | POLLWRNORM;
1604         if (!connected(ps))
1605                 mask |= POLLERR | POLLHUP;
1606         return mask;
1607 }
1608
1609 const struct file_operations usbdev_file_operations = {
1610         .owner =        THIS_MODULE,
1611         .llseek =       usbdev_lseek,
1612         .read =         usbdev_read,
1613         .poll =         usbdev_poll,
1614         .ioctl =        usbdev_ioctl,
1615         .open =         usbdev_open,
1616         .release =      usbdev_release,
1617 };
1618
1619 #ifdef CONFIG_USB_DEVICE_CLASS
1620 static struct class *usb_classdev_class;
1621
1622 static int usb_classdev_add(struct usb_device *dev)
1623 {
1624         int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1625
1626         dev->usb_classdev = device_create(usb_classdev_class, &dev->dev,
1627                                 MKDEV(USB_DEVICE_MAJOR, minor),
1628                                 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1629         if (IS_ERR(dev->usb_classdev))
1630                 return PTR_ERR(dev->usb_classdev);
1631
1632         return 0;
1633 }
1634
1635 static void usb_classdev_remove(struct usb_device *dev)
1636 {
1637         device_unregister(dev->usb_classdev);
1638 }
1639
1640 static int usb_classdev_notify(struct notifier_block *self,
1641                                unsigned long action, void *dev)
1642 {
1643         switch (action) {
1644         case USB_DEVICE_ADD:
1645                 if (usb_classdev_add(dev))
1646                         return NOTIFY_BAD;
1647                 break;
1648         case USB_DEVICE_REMOVE:
1649                 usb_classdev_remove(dev);
1650                 break;
1651         }
1652         return NOTIFY_OK;
1653 }
1654
1655 static struct notifier_block usbdev_nb = {
1656         .notifier_call =        usb_classdev_notify,
1657 };
1658 #endif
1659
1660 static struct cdev usb_device_cdev;
1661
1662 int __init usb_devio_init(void)
1663 {
1664         int retval;
1665
1666         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1667                         "usb_device");
1668         if (retval) {
1669                 err("unable to register minors for usb_device");
1670                 goto out;
1671         }
1672         cdev_init(&usb_device_cdev, &usbdev_file_operations);
1673         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1674         if (retval) {
1675                 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1676                 goto error_cdev;
1677         }
1678 #ifdef CONFIG_USB_DEVICE_CLASS
1679         usb_classdev_class = class_create(THIS_MODULE, "usb_device");
1680         if (IS_ERR(usb_classdev_class)) {
1681                 err("unable to register usb_device class");
1682                 retval = PTR_ERR(usb_classdev_class);
1683                 cdev_del(&usb_device_cdev);
1684                 usb_classdev_class = NULL;
1685                 goto out;
1686         }
1687
1688         usb_register_notify(&usbdev_nb);
1689 #endif
1690 out:
1691         return retval;
1692
1693 error_cdev:
1694         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1695         goto out;
1696 }
1697
1698 void usb_devio_cleanup(void)
1699 {
1700 #ifdef CONFIG_USB_DEVICE_CLASS
1701         usb_unregister_notify(&usbdev_nb);
1702         class_destroy(usb_classdev_class);
1703 #endif
1704         cdev_del(&usb_device_cdev);
1705         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1706 }