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

   1 /*****************************************************************************/
   2
   3 /*
   4  *      devio.c  --  User space communication with USB devices.
   5  *
   6  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   7  *
   8  *      This program is free software; you can redistribute it and/or modify
   9  *      it under the terms of the GNU General Public License as published by
  10  *      the Free Software Foundation; either version 2 of the License, or
  11  *      (at your option) any later version.
  12  *
  13  *      This program is distributed in the hope that it will be useful,
  14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *      GNU General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License
  19  *      along with this program; if not, write to the Free Software
  20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  *  $Id: devio.c,v 1.7 2000/02/01 17:28:48 fliegl Exp $
  23  *
  24  *  This file implements the usbfs/x/y files, where
  25  *  x is the bus number and y the device number.
  26  *
  27  *  It allows user space programs/"drivers" to communicate directly
  28  *  with USB devices without intervening kernel driver.
  29  *
  30  *  Revision history
  31  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  32  *    04.01.2000   0.2   Turned into its own filesystem
  33  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  34  *                       (CAN-2005-3055)
  35  */
  36
  37 /*****************************************************************************/
  38
  39 #include <linux/fs.h>
  40 #include <linux/mm.h>
  41 #include <linux/slab.h>
  42 #include <linux/smp_lock.h>
  43 #include <linux/signal.h>
  44 #include <linux/poll.h>
  45 #include <linux/module.h>
  46 #include <linux/usb.h>
  47 #include <linux/usbdevice_fs.h>
  48 #include <linux/cdev.h>
  49 #include <linux/notifier.h>
  50 #include <asm/uaccess.h>
  51 #include <asm/byteorder.h>
  52 #include <linux/moduleparam.h>
  53
  54 #include "hcd.h"        /* for usbcore internals */
  55 #include "usb.h"
  56
  57 #define USB_MAXBUS                      64
  58 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
  59 static struct class *usb_device_class;
  60
  61 struct async {
  62         struct list_head asynclist;
  63         struct dev_state *ps;
  64         pid_t pid;
  65         uid_t uid, euid;
  66         unsigned int signr;
  67         unsigned int ifnum;
  68         void __user *userbuffer;
  69         void __user *userurb;
  70         struct urb *urb;
  71 };
  72
  73 static int usbfs_snoop = 0;
  74 module_param (usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  75 MODULE_PARM_DESC (usbfs_snoop, "true to log all usbfs traffic");
  76
  77 #define snoop(dev, format, arg...)                              \
  78         do {                                                    \
  79                 if (usbfs_snoop)                                \
  80                         dev_info( dev , format , ## arg);       \
  81         } while (0)
  82
  83 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
  84
  85
  86 #define MAX_USBFS_BUFFER_SIZE   16384
  87
  88 static inline int connected (struct usb_device *dev)
  89 {
  90         return dev->state != USB_STATE_NOTATTACHED;
  91 }
  92
  93 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
  94 {
  95         loff_t ret;
  96
  97         lock_kernel();
  98
  99         switch (orig) {
 100         case 0:
 101                 file->f_pos = offset;
 102                 ret = file->f_pos;
 103                 break;
 104         case 1:
 105                 file->f_pos += offset;
 106                 ret = file->f_pos;
 107                 break;
 108         case 2:
 109         default:
 110                 ret = -EINVAL;
 111         }
 112
 113         unlock_kernel();
 114         return ret;
 115 }
 116
 117 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
 118 {
 119         struct dev_state *ps = (struct dev_state *)file->private_data;
 120         struct usb_device *dev = ps->dev;
 121         ssize_t ret = 0;
 122         unsigned len;
 123         loff_t pos;
 124         int i;
 125
 126         pos = *ppos;
 127         usb_lock_device(dev);
 128         if (!connected(dev)) {
 129                 ret = -ENODEV;
 130                 goto err;
 131         } else if (pos < 0) {
 132                 ret = -EINVAL;
 133                 goto err;
 134         }
 135
 136         if (pos < sizeof(struct usb_device_descriptor)) {
 137                 struct usb_device_descriptor *desc = kmalloc(sizeof(*desc), GFP_KERNEL);
 138                 if (!desc) {
 139                         ret = -ENOMEM;
 140                         goto err;
 141                 }
 142                 memcpy(desc, &dev->descriptor, sizeof(dev->descriptor));
 143                 le16_to_cpus(&desc->bcdUSB);
 144                 le16_to_cpus(&desc->idVendor);
 145                 le16_to_cpus(&desc->idProduct);
 146                 le16_to_cpus(&desc->bcdDevice);
 147
 148                 len = sizeof(struct usb_device_descriptor) - pos;
 149                 if (len > nbytes)
 150                         len = nbytes;
 151                 if (copy_to_user(buf, ((char *)desc) + pos, len)) {
 152                         kfree(desc);
 153                         ret = -EFAULT;
 154                         goto err;
 155                 }
 156                 kfree(desc);
 157
 158                 *ppos += len;
 159                 buf += len;
 160                 nbytes -= len;
 161                 ret += len;
 162         }
 163
 164         pos = sizeof(struct usb_device_descriptor);
 165         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 166                 struct usb_config_descriptor *config =
 167                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 168                 unsigned int length = le16_to_cpu(config->wTotalLength);
 169
 170                 if (*ppos < pos + length) {
 171
 172                         /* The descriptor may claim to be longer than it
 173                          * really is.  Here is the actual allocated length. */
 174                         unsigned alloclen =
 175                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 176
 177                         len = length - (*ppos - pos);
 178                         if (len > nbytes)
 179                                 len = nbytes;
 180
 181                         /* Simply don't write (skip over) unallocated parts */
 182                         if (alloclen > (*ppos - pos)) {
 183                                 alloclen -= (*ppos - pos);
 184                                 if (copy_to_user(buf,
 185                                     dev->rawdescriptors[i] + (*ppos - pos),
 186                                     min(len, alloclen))) {
 187                                         ret = -EFAULT;
 188                                         goto err;
 189                                 }
 190                         }
 191
 192                         *ppos += len;
 193                         buf += len;
 194                         nbytes -= len;
 195                         ret += len;
 196                 }
 197
 198                 pos += length;
 199         }
 200
 201 err:
 202         usb_unlock_device(dev);
 203         return ret;
 204 }
 205
 206 /*
 207  * async list handling
 208  */
 209
 210 static struct async *alloc_async(unsigned int numisoframes)
 211 {
 212         unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor);
 213         struct async *as = kzalloc(assize, GFP_KERNEL);
 214
 215         if (!as)
 216                 return NULL;
 217         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 218         if (!as->urb) {
 219                 kfree(as);
 220                 return NULL;
 221         }
 222         return as;
 223 }
 224
 225 static void free_async(struct async *as)
 226 {
 227         kfree(as->urb->transfer_buffer);
 228         kfree(as->urb->setup_packet);
 229         usb_free_urb(as->urb);
 230         kfree(as);
 231 }
 232
 233 static inline void async_newpending(struct async *as)
 234 {
 235         struct dev_state *ps = as->ps;
 236         unsigned long flags;
 237
 238         spin_lock_irqsave(&ps->lock, flags);
 239         list_add_tail(&as->asynclist, &ps->async_pending);
 240         spin_unlock_irqrestore(&ps->lock, flags);
 241 }
 242
 243 static inline void async_removepending(struct async *as)
 244 {
 245         struct dev_state *ps = as->ps;
 246         unsigned long flags;
 247
 248         spin_lock_irqsave(&ps->lock, flags);
 249         list_del_init(&as->asynclist);
 250         spin_unlock_irqrestore(&ps->lock, flags);
 251 }
 252
 253 static inline struct async *async_getcompleted(struct dev_state *ps)
 254 {
 255         unsigned long flags;
 256         struct async *as = NULL;
 257
 258         spin_lock_irqsave(&ps->lock, flags);
 259         if (!list_empty(&ps->async_completed)) {
 260                 as = list_entry(ps->async_completed.next, struct async, asynclist);
 261                 list_del_init(&as->asynclist);
 262         }
 263         spin_unlock_irqrestore(&ps->lock, flags);
 264         return as;
 265 }
 266
 267 static inline struct async *async_getpending(struct dev_state *ps, void __user *userurb)
 268 {
 269         unsigned long flags;
 270         struct async *as;
 271
 272         spin_lock_irqsave(&ps->lock, flags);
 273         list_for_each_entry(as, &ps->async_pending, asynclist)
 274                 if (as->userurb == userurb) {
 275                         list_del_init(&as->asynclist);
 276                         spin_unlock_irqrestore(&ps->lock, flags);
 277                         return as;
 278                 }
 279         spin_unlock_irqrestore(&ps->lock, flags);
 280         return NULL;
 281 }
 282
 283 static void snoop_urb(struct urb *urb, void __user *userurb)
 284 {
 285         int j;
 286         unsigned char *data = urb->transfer_buffer;
 287
 288         if (!usbfs_snoop)
 289                 return;
 290
 291         if (urb->pipe & USB_DIR_IN)
 292                 dev_info(&urb->dev->dev, "direction=IN\n");
 293         else
 294                 dev_info(&urb->dev->dev, "direction=OUT\n");
 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, struct pt_regs *regs)
 306 {
 307         struct async *as = (struct async *)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         if (as->signr) {
 315                 sinfo.si_signo = as->signr;
 316                 sinfo.si_errno = as->urb->status;
 317                 sinfo.si_code = SI_ASYNCIO;
 318                 sinfo.si_addr = as->userurb;
 319                 kill_proc_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
 320                                       as->euid);
 321         }
 322         snoop(&urb->dev->dev, "urb complete\n");
 323         snoop_urb(urb, as->userurb);
 324         wake_up(&ps->wait);
 325 }
 326
 327 static void destroy_async (struct dev_state *ps, struct list_head *list)
 328 {
 329         struct async *as;
 330         unsigned long flags;
 331
 332         spin_lock_irqsave(&ps->lock, flags);
 333         while (!list_empty(list)) {
 334                 as = list_entry(list->next, struct async, asynclist);
 335                 list_del_init(&as->asynclist);
 336
 337                 /* drop the spinlock so the completion handler can run */
 338                 spin_unlock_irqrestore(&ps->lock, flags);
 339                 usb_kill_urb(as->urb);
 340                 spin_lock_irqsave(&ps->lock, flags);
 341         }
 342         spin_unlock_irqrestore(&ps->lock, flags);
 343         as = async_getcompleted(ps);
 344         while (as) {
 345                 free_async(as);
 346                 as = async_getcompleted(ps);
 347         }
 348 }
 349
 350 static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum)
 351 {
 352         struct list_head *p, *q, hitlist;
 353         unsigned long flags;
 354
 355         INIT_LIST_HEAD(&hitlist);
 356         spin_lock_irqsave(&ps->lock, flags);
 357         list_for_each_safe(p, q, &ps->async_pending)
 358                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 359                         list_move_tail(p, &hitlist);
 360         spin_unlock_irqrestore(&ps->lock, flags);
 361         destroy_async(ps, &hitlist);
 362 }
 363
 364 static inline void destroy_all_async(struct dev_state *ps)
 365 {
 366                 destroy_async(ps, &ps->async_pending);
 367 }
 368
 369 /*
 370  * interface claims are made only at the request of user level code,
 371  * which can also release them (explicitly or by closing files).
 372  * they're also undone when devices disconnect.
 373  */
 374
 375 static int driver_probe (struct usb_interface *intf,
 376                          const struct usb_device_id *id)
 377 {
 378         return -ENODEV;
 379 }
 380
 381 static void driver_disconnect(struct usb_interface *intf)
 382 {
 383         struct dev_state *ps = usb_get_intfdata (intf);
 384         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 385
 386         if (!ps)
 387                 return;
 388
 389         /* NOTE:  this relies on usbcore having canceled and completed
 390          * all pending I/O requests; 2.6 does that.
 391          */
 392
 393         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 394                 clear_bit(ifnum, &ps->ifclaimed);
 395         else
 396                 warn("interface number %u out of range", ifnum);
 397
 398         usb_set_intfdata (intf, NULL);
 399
 400         /* force async requests to complete */
 401         destroy_async_on_interface(ps, ifnum);
 402 }
 403
 404 struct usb_driver usbfs_driver = {
 405         .name =         "usbfs",
 406         .probe =        driver_probe,
 407         .disconnect =   driver_disconnect,
 408 };
 409
 410 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 411 {
 412         struct usb_device *dev = ps->dev;
 413         struct usb_interface *intf;
 414         int err;
 415
 416         if (ifnum >= 8*sizeof(ps->ifclaimed))
 417                 return -EINVAL;
 418         /* already claimed */
 419         if (test_bit(ifnum, &ps->ifclaimed))
 420                 return 0;
 421
 422         /* lock against other changes to driver bindings */
 423         down_write(&usb_bus_type.subsys.rwsem);
 424         intf = usb_ifnum_to_if(dev, ifnum);
 425         if (!intf)
 426                 err = -ENOENT;
 427         else
 428                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 429         up_write(&usb_bus_type.subsys.rwsem);
 430         if (err == 0)
 431                 set_bit(ifnum, &ps->ifclaimed);
 432         return err;
 433 }
 434
 435 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 436 {
 437         struct usb_device *dev;
 438         struct usb_interface *intf;
 439         int err;
 440
 441         err = -EINVAL;
 442         if (ifnum >= 8*sizeof(ps->ifclaimed))
 443                 return err;
 444         dev = ps->dev;
 445         /* lock against other changes to driver bindings */
 446         down_write(&usb_bus_type.subsys.rwsem);
 447         intf = usb_ifnum_to_if(dev, ifnum);
 448         if (!intf)
 449                 err = -ENOENT;
 450         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 451                 usb_driver_release_interface(&usbfs_driver, intf);
 452                 err = 0;
 453         }
 454         up_write(&usb_bus_type.subsys.rwsem);
 455         return err;
 456 }
 457
 458 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 459 {
 460         if (ps->dev->state != USB_STATE_CONFIGURED)
 461                 return -EHOSTUNREACH;
 462         if (ifnum >= 8*sizeof(ps->ifclaimed))
 463                 return -EINVAL;
 464         if (test_bit(ifnum, &ps->ifclaimed))
 465                 return 0;
 466         /* if not yet claimed, claim it for the driver */
 467         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n",
 468                current->pid, current->comm, ifnum);
 469         return claimintf(ps, ifnum);
 470 }
 471
 472 static int findintfep(struct usb_device *dev, unsigned int ep)
 473 {
 474         unsigned int i, j, e;
 475         struct usb_interface *intf;
 476         struct usb_host_interface *alts;
 477         struct usb_endpoint_descriptor *endpt;
 478
 479         if (ep & ~(USB_DIR_IN|0xf))
 480                 return -EINVAL;
 481         if (!dev->actconfig)
 482                 return -ESRCH;
 483         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 484                 intf = dev->actconfig->interface[i];
 485                 for (j = 0; j < intf->num_altsetting; j++) {
 486                         alts = &intf->altsetting[j];
 487                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 488                                 endpt = &alts->endpoint[e].desc;
 489                                 if (endpt->bEndpointAddress == ep)
 490                                         return alts->desc.bInterfaceNumber;
 491                         }
 492                 }
 493         }
 494         return -ENOENT;
 495 }
 496
 497 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
 498 {
 499         int ret = 0;
 500
 501         if (ps->dev->state != USB_STATE_CONFIGURED)
 502                 return -EHOSTUNREACH;
 503         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 504                 return 0;
 505
 506         index &= 0xff;
 507         switch (requesttype & USB_RECIP_MASK) {
 508         case USB_RECIP_ENDPOINT:
 509                 if ((ret = findintfep(ps->dev, index)) >= 0)
 510                         ret = checkintf(ps, ret);
 511                 break;
 512
 513         case USB_RECIP_INTERFACE:
 514                 ret = checkintf(ps, index);
 515                 break;
 516         }
 517         return ret;
 518 }
 519
 520 static struct usb_device *usbdev_lookup_minor(int minor)
 521 {
 522         struct class_device *class_dev;
 523         struct usb_device *dev = NULL;
 524
 525         down(&usb_device_class->sem);
 526         list_for_each_entry(class_dev, &usb_device_class->children, node) {
 527                 if (class_dev->devt == MKDEV(USB_DEVICE_MAJOR, minor)) {
 528                         dev = class_dev->class_data;
 529                         break;
 530                 }
 531         }
 532         up(&usb_device_class->sem);
 533
 534         return dev;
 535 };
 536
 537 /*
 538  * file operations
 539  */
 540 static int usbdev_open(struct inode *inode, struct file *file)
 541 {
 542         struct usb_device *dev = NULL;
 543         struct dev_state *ps;
 544         int ret;
 545
 546         /*
 547          * no locking necessary here, as chrdev_open has the kernel lock
 548          * (still acquire the kernel lock for safety)
 549          */
 550         ret = -ENOMEM;
 551         if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
 552                 goto out_nolock;
 553
 554         lock_kernel();
 555         ret = -ENOENT;
 556         /* check if we are called from a real node or usbfs */
 557         if (imajor(inode) == USB_DEVICE_MAJOR)
 558                 dev = usbdev_lookup_minor(iminor(inode));
 559         if (!dev)
 560                 dev = inode->u.generic_ip;
 561         if (!dev) {
 562                 kfree(ps);
 563                 goto out;
 564         }
 565         usb_get_dev(dev);
 566         ret = 0;
 567         ps->dev = dev;
 568         ps->file = file;
 569         spin_lock_init(&ps->lock);
 570         INIT_LIST_HEAD(&ps->async_pending);
 571         INIT_LIST_HEAD(&ps->async_completed);
 572         init_waitqueue_head(&ps->wait);
 573         ps->discsignr = 0;
 574         ps->disc_pid = current->pid;
 575         ps->disc_uid = current->uid;
 576         ps->disc_euid = current->euid;
 577         ps->disccontext = NULL;
 578         ps->ifclaimed = 0;
 579         wmb();
 580         list_add_tail(&ps->list, &dev->filelist);
 581         file->private_data = ps;
 582  out:
 583         unlock_kernel();
 584  out_nolock:
 585         return ret;
 586 }
 587
 588 static int usbdev_release(struct inode *inode, struct file *file)
 589 {
 590         struct dev_state *ps = (struct dev_state *)file->private_data;
 591         struct usb_device *dev = ps->dev;
 592         unsigned int ifnum;
 593
 594         usb_lock_device(dev);
 595         list_del_init(&ps->list);
 596         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 597                         ifnum++) {
 598                 if (test_bit(ifnum, &ps->ifclaimed))
 599                         releaseintf(ps, ifnum);
 600         }
 601         destroy_all_async(ps);
 602         usb_unlock_device(dev);
 603         usb_put_dev(dev);
 604         ps->dev = NULL;
 605         kfree(ps);
 606         return 0;
 607 }
 608
 609 static int proc_control(struct dev_state *ps, void __user *arg)
 610 {
 611         struct usb_device *dev = ps->dev;
 612         struct usbdevfs_ctrltransfer ctrl;
 613         unsigned int tmo;
 614         unsigned char *tbuf;
 615         int i, j, ret;
 616
 617         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 618                 return -EFAULT;
 619         if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
 620                 return ret;
 621         if (ctrl.wLength > PAGE_SIZE)
 622                 return -EINVAL;
 623         if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
 624                 return -ENOMEM;
 625         tmo = ctrl.timeout;
 626         if (ctrl.bRequestType & 0x80) {
 627                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
 628                         free_page((unsigned long)tbuf);
 629                         return -EINVAL;
 630                 }
 631                 snoop(&dev->dev, "control read: bRequest=%02x "
 632                                 "bRrequestType=%02x wValue=%04x "
 633                                 "wIndex=%04x wLength=%04x\n",
 634                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 635                                 ctrl.wIndex, ctrl.wLength);
 636
 637                 usb_unlock_device(dev);
 638                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 639                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 640                 usb_lock_device(dev);
 641                 if ((i > 0) && ctrl.wLength) {
 642                         if (usbfs_snoop) {
 643                                 dev_info(&dev->dev, "control read: data ");
 644                                 for (j = 0; j < i; ++j)
 645                                         printk("%02x ", (unsigned char)(tbuf)[j]);
 646                                 printk("\n");
 647                         }
 648                         if (copy_to_user(ctrl.data, tbuf, i)) {
 649                                 free_page((unsigned long)tbuf);
 650                                 return -EFAULT;
 651                         }
 652                 }
 653         } else {
 654                 if (ctrl.wLength) {
 655                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 656                                 free_page((unsigned long)tbuf);
 657                                 return -EFAULT;
 658                         }
 659                 }
 660                 snoop(&dev->dev, "control write: bRequest=%02x "
 661                                 "bRrequestType=%02x wValue=%04x "
 662                                 "wIndex=%04x wLength=%04x\n",
 663                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 664                                 ctrl.wIndex, ctrl.wLength);
 665                 if (usbfs_snoop) {
 666                         dev_info(&dev->dev, "control write: data: ");
 667                         for (j = 0; j < ctrl.wLength; ++j)
 668                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 669                         printk("\n");
 670                 }
 671                 usb_unlock_device(dev);
 672                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 673                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 674                 usb_lock_device(dev);
 675         }
 676         free_page((unsigned long)tbuf);
 677         if (i<0 && i != -EPIPE) {
 678                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 679                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 680                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 681                            ctrl.wLength, i);
 682         }
 683         return i;
 684 }
 685
 686 static int proc_bulk(struct dev_state *ps, void __user *arg)
 687 {
 688         struct usb_device *dev = ps->dev;
 689         struct usbdevfs_bulktransfer bulk;
 690         unsigned int tmo, len1, pipe;
 691         int len2;
 692         unsigned char *tbuf;
 693         int i, j, ret;
 694
 695         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 696                 return -EFAULT;
 697         if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
 698                 return ret;
 699         if ((ret = checkintf(ps, ret)))
 700                 return ret;
 701         if (bulk.ep & USB_DIR_IN)
 702                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 703         else
 704                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 705         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 706                 return -EINVAL;
 707         len1 = bulk.len;
 708         if (len1 > MAX_USBFS_BUFFER_SIZE)
 709                 return -EINVAL;
 710         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 711                 return -ENOMEM;
 712         tmo = bulk.timeout;
 713         if (bulk.ep & 0x80) {
 714                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 715                         kfree(tbuf);
 716                         return -EINVAL;
 717                 }
 718                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
 719                         bulk.len, bulk.timeout);
 720                 usb_unlock_device(dev);
 721                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 722                 usb_lock_device(dev);
 723                 if (!i && len2) {
 724                         if (usbfs_snoop) {
 725                                 dev_info(&dev->dev, "bulk read: data ");
 726                                 for (j = 0; j < len2; ++j)
 727                                         printk("%02x ", (unsigned char)(tbuf)[j]);
 728                                 printk("\n");
 729                         }
 730                         if (copy_to_user(bulk.data, tbuf, len2)) {
 731                                 kfree(tbuf);
 732                                 return -EFAULT;
 733                         }
 734                 }
 735         } else {
 736                 if (len1) {
 737                         if (copy_from_user(tbuf, bulk.data, len1)) {
 738                                 kfree(tbuf);
 739                                 return -EFAULT;
 740                         }
 741                 }
 742                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
 743                         bulk.len, bulk.timeout);
 744                 if (usbfs_snoop) {
 745                         dev_info(&dev->dev, "bulk write: data: ");
 746                         for (j = 0; j < len1; ++j)
 747                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 748                         printk("\n");
 749                 }
 750                 usb_unlock_device(dev);
 751                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 752                 usb_lock_device(dev);
 753         }
 754         kfree(tbuf);
 755         if (i < 0)
 756                 return i;
 757         return len2;
 758 }
 759
 760 static int proc_resetep(struct dev_state *ps, void __user *arg)
 761 {
 762         unsigned int ep;
 763         int ret;
 764
 765         if (get_user(ep, (unsigned int __user *)arg))
 766                 return -EFAULT;
 767         if ((ret = findintfep(ps->dev, ep)) < 0)
 768                 return ret;
 769         if ((ret = checkintf(ps, ret)))
 770                 return ret;
 771         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
 772         return 0;
 773 }
 774
 775 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 776 {
 777         unsigned int ep;
 778         int pipe;
 779         int ret;
 780
 781         if (get_user(ep, (unsigned int __user *)arg))
 782                 return -EFAULT;
 783         if ((ret = findintfep(ps->dev, ep)) < 0)
 784                 return ret;
 785         if ((ret = checkintf(ps, ret)))
 786                 return ret;
 787         if (ep & USB_DIR_IN)
 788                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 789         else
 790                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 791
 792         return usb_clear_halt(ps->dev, pipe);
 793 }
 794
 795
 796 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 797 {
 798         struct usbdevfs_getdriver gd;
 799         struct usb_interface *intf;
 800         int ret;
 801
 802         if (copy_from_user(&gd, arg, sizeof(gd)))
 803                 return -EFAULT;
 804         down_read(&usb_bus_type.subsys.rwsem);
 805         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 806         if (!intf || !intf->dev.driver)
 807                 ret = -ENODATA;
 808         else {
 809                 strncpy(gd.driver, intf->dev.driver->name,
 810                                 sizeof(gd.driver));
 811                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 812         }
 813         up_read(&usb_bus_type.subsys.rwsem);
 814         return ret;
 815 }
 816
 817 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 818 {
 819         struct usbdevfs_connectinfo ci;
 820
 821         ci.devnum = ps->dev->devnum;
 822         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 823         if (copy_to_user(arg, &ci, sizeof(ci)))
 824                 return -EFAULT;
 825         return 0;
 826 }
 827
 828 static int proc_resetdevice(struct dev_state *ps)
 829 {
 830         return usb_reset_device(ps->dev);
 831
 832 }
 833
 834 static int proc_setintf(struct dev_state *ps, void __user *arg)
 835 {
 836         struct usbdevfs_setinterface setintf;
 837         int ret;
 838
 839         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 840                 return -EFAULT;
 841         if ((ret = checkintf(ps, setintf.interface)))
 842                 return ret;
 843         return usb_set_interface(ps->dev, setintf.interface,
 844                         setintf.altsetting);
 845 }
 846
 847 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 848 {
 849         unsigned int u;
 850         int status = 0;
 851         struct usb_host_config *actconfig;
 852
 853         if (get_user(u, (unsigned int __user *)arg))
 854                 return -EFAULT;
 855
 856         actconfig = ps->dev->actconfig;
 857
 858         /* Don't touch the device if any interfaces are claimed.
 859          * It could interfere with other drivers' operations, and if
 860          * an interface is claimed by usbfs it could easily deadlock.
 861          */
 862         if (actconfig) {
 863                 int i;
 864
 865                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 866                         if (usb_interface_claimed(actconfig->interface[i])) {
 867                                 dev_warn (&ps->dev->dev,
 868                                         "usbfs: interface %d claimed by %s "
 869                                         "while '%s' sets config #%d\n",
 870                                         actconfig->interface[i]
 871                                                 ->cur_altsetting
 872                                                 ->desc.bInterfaceNumber,
 873                                         actconfig->interface[i]
 874                                                 ->dev.driver->name,
 875                                         current->comm, u);
 876                                 status = -EBUSY;
 877                                 break;
 878                         }
 879                 }
 880         }
 881
 882         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 883          * so avoid usb_set_configuration()'s kick to sysfs
 884          */
 885         if (status == 0) {
 886                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 887                         status = usb_reset_configuration(ps->dev);
 888                 else
 889                         status = usb_set_configuration(ps->dev, u);
 890         }
 891
 892         return status;
 893 }
 894
 895 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 896                              struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
 897                              void __user *arg)
 898 {
 899         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 900         struct usb_host_endpoint *ep;
 901         struct async *as;
 902         struct usb_ctrlrequest *dr = NULL;
 903         unsigned int u, totlen, isofrmlen;
 904         int ret, interval = 0, ifnum = -1;
 905
 906         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
 907                            URB_NO_FSBR|URB_ZERO_PACKET))
 908                 return -EINVAL;
 909         if (!uurb->buffer)
 910                 return -EINVAL;
 911         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
 912                 return -EINVAL;
 913         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
 914                 if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
 915                         return ifnum;
 916                 if ((ret = checkintf(ps, ifnum)))
 917                         return ret;
 918         }
 919         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0)
 920                 ep = ps->dev->ep_in [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 921         else
 922                 ep = ps->dev->ep_out [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 923         if (!ep)
 924                 return -ENOENT;
 925         switch(uurb->type) {
 926         case USBDEVFS_URB_TYPE_CONTROL:
 927                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 928                                 != USB_ENDPOINT_XFER_CONTROL)
 929                         return -EINVAL;
 930                 /* min 8 byte setup packet, max arbitrary */
 931                 if (uurb->buffer_length < 8 || uurb->buffer_length > PAGE_SIZE)
 932                         return -EINVAL;
 933                 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
 934                         return -ENOMEM;
 935                 if (copy_from_user(dr, uurb->buffer, 8)) {
 936                         kfree(dr);
 937                         return -EFAULT;
 938                 }
 939                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
 940                         kfree(dr);
 941                         return -EINVAL;
 942                 }
 943                 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
 944                         kfree(dr);
 945                         return ret;
 946                 }
 947                 uurb->endpoint = (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK);
 948                 uurb->number_of_packets = 0;
 949                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
 950                 uurb->buffer += 8;
 951                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ?  VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) {
 952                         kfree(dr);
 953                         return -EFAULT;
 954                 }
 955                 snoop(&ps->dev->dev, "control urb\n");
 956                 break;
 957
 958         case USBDEVFS_URB_TYPE_BULK:
 959                 switch (ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 960                 case USB_ENDPOINT_XFER_CONTROL:
 961                 case USB_ENDPOINT_XFER_ISOC:
 962                         return -EINVAL;
 963                 /* allow single-shot interrupt transfers, at bogus rates */
 964                 }
 965                 uurb->number_of_packets = 0;
 966                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
 967                         return -EINVAL;
 968                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
 969                         return -EFAULT;
 970                 snoop(&ps->dev->dev, "bulk urb\n");
 971                 break;
 972
 973         case USBDEVFS_URB_TYPE_ISO:
 974                 /* arbitrary limit */
 975                 if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
 976                         return -EINVAL;
 977                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 978                                 != USB_ENDPOINT_XFER_ISOC)
 979                         return -EINVAL;
 980                 interval = 1 << min (15, ep->desc.bInterval - 1);
 981                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
 982                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
 983                         return -ENOMEM;
 984                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
 985                         kfree(isopkt);
 986                         return -EFAULT;
 987                 }
 988                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
 989                         if (isopkt[u].length > 1023) {
 990                                 kfree(isopkt);
 991                                 return -EINVAL;
 992                         }
 993                         totlen += isopkt[u].length;
 994                 }
 995                 if (totlen > 32768) {
 996                         kfree(isopkt);
 997                         return -EINVAL;
 998                 }
 999                 uurb->buffer_length = totlen;
1000                 snoop(&ps->dev->dev, "iso urb\n");
1001                 break;
1002
1003         case USBDEVFS_URB_TYPE_INTERRUPT:
1004                 uurb->number_of_packets = 0;
1005                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
1006                                 != USB_ENDPOINT_XFER_INT)
1007                         return -EINVAL;
1008                 if (ps->dev->speed == USB_SPEED_HIGH)
1009                         interval = 1 << min (15, ep->desc.bInterval - 1);
1010                 else
1011                         interval = ep->desc.bInterval;
1012                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1013                         return -EINVAL;
1014                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
1015                         return -EFAULT;
1016                 snoop(&ps->dev->dev, "interrupt urb\n");
1017                 break;
1018
1019         default:
1020                 return -EINVAL;
1021         }
1022         if (!(as = alloc_async(uurb->number_of_packets))) {
1023                 kfree(isopkt);
1024                 kfree(dr);
1025                 return -ENOMEM;
1026         }
1027         if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
1028                 kfree(isopkt);
1029                 kfree(dr);
1030                 free_async(as);
1031                 return -ENOMEM;
1032         }
1033         as->urb->dev = ps->dev;
1034         as->urb->pipe = (uurb->type << 30) | __create_pipe(ps->dev, uurb->endpoint & 0xf) | (uurb->endpoint & USB_DIR_IN);
1035         as->urb->transfer_flags = uurb->flags;
1036         as->urb->transfer_buffer_length = uurb->buffer_length;
1037         as->urb->setup_packet = (unsigned char*)dr;
1038         as->urb->start_frame = uurb->start_frame;
1039         as->urb->number_of_packets = uurb->number_of_packets;
1040         as->urb->interval = interval;
1041         as->urb->context = as;
1042         as->urb->complete = async_completed;
1043         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1044                 as->urb->iso_frame_desc[u].offset = totlen;
1045                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1046                 totlen += isopkt[u].length;
1047         }
1048         kfree(isopkt);
1049         as->ps = ps;
1050         as->userurb = arg;
1051         if (uurb->endpoint & USB_DIR_IN)
1052                 as->userbuffer = uurb->buffer;
1053         else
1054                 as->userbuffer = NULL;
1055         as->signr = uurb->signr;
1056         as->ifnum = ifnum;
1057         as->pid = current->pid;
1058         as->uid = current->uid;
1059         as->euid = current->euid;
1060         if (!(uurb->endpoint & USB_DIR_IN)) {
1061                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, as->urb->transfer_buffer_length)) {
1062                         free_async(as);
1063                         return -EFAULT;
1064                 }
1065         }
1066         snoop(&as->urb->dev->dev, "submit urb\n");
1067         snoop_urb(as->urb, as->userurb);
1068         async_newpending(as);
1069         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1070                 dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
1071                 async_removepending(as);
1072                 free_async(as);
1073                 return ret;
1074         }
1075         return 0;
1076 }
1077
1078 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1079 {
1080         struct usbdevfs_urb uurb;
1081
1082         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1083                 return -EFAULT;
1084
1085         return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg);
1086 }
1087
1088 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1089 {
1090         struct async *as;
1091
1092         as = async_getpending(ps, arg);
1093         if (!as)
1094                 return -EINVAL;
1095         usb_kill_urb(as->urb);
1096         return 0;
1097 }
1098
1099 static int processcompl(struct async *as, void __user * __user *arg)
1100 {
1101         struct urb *urb = as->urb;
1102         struct usbdevfs_urb __user *userurb = as->userurb;
1103         void __user *addr = as->userurb;
1104         unsigned int i;
1105
1106         if (as->userbuffer)
1107                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1108                         return -EFAULT;
1109         if (put_user(urb->status, &userurb->status))
1110                 return -EFAULT;
1111         if (put_user(urb->actual_length, &userurb->actual_length))
1112                 return -EFAULT;
1113         if (put_user(urb->error_count, &userurb->error_count))
1114                 return -EFAULT;
1115
1116         if (usb_pipeisoc(urb->pipe)) {
1117                 for (i = 0; i < urb->number_of_packets; i++) {
1118                         if (put_user(urb->iso_frame_desc[i].actual_length,
1119                                      &userurb->iso_frame_desc[i].actual_length))
1120                                 return -EFAULT;
1121                         if (put_user(urb->iso_frame_desc[i].status,
1122                                      &userurb->iso_frame_desc[i].status))
1123                                 return -EFAULT;
1124                 }
1125         }
1126
1127         free_async(as);
1128
1129         if (put_user(addr, (void __user * __user *)arg))
1130                 return -EFAULT;
1131         return 0;
1132 }
1133
1134 static struct async* reap_as(struct dev_state *ps)
1135 {
1136         DECLARE_WAITQUEUE(wait, current);
1137         struct async *as = NULL;
1138         struct usb_device *dev = ps->dev;
1139
1140         add_wait_queue(&ps->wait, &wait);
1141         for (;;) {
1142                 __set_current_state(TASK_INTERRUPTIBLE);
1143                 if ((as = async_getcompleted(ps)))
1144                         break;
1145                 if (signal_pending(current))
1146                         break;
1147                 usb_unlock_device(dev);
1148                 schedule();
1149                 usb_lock_device(dev);
1150         }
1151         remove_wait_queue(&ps->wait, &wait);
1152         set_current_state(TASK_RUNNING);
1153         return as;
1154 }
1155
1156 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1157 {
1158         struct async *as = reap_as(ps);
1159         if (as)
1160                 return processcompl(as, (void __user * __user *)arg);
1161         if (signal_pending(current))
1162                 return -EINTR;
1163         return -EIO;
1164 }
1165
1166 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1167 {
1168         struct async *as;
1169
1170         if (!(as = async_getcompleted(ps)))
1171                 return -EAGAIN;
1172         return processcompl(as, (void __user * __user *)arg);
1173 }
1174
1175 #ifdef CONFIG_COMPAT
1176
1177 static int get_urb32(struct usbdevfs_urb *kurb,
1178                      struct usbdevfs_urb32 __user *uurb)
1179 {
1180         __u32  uptr;
1181         if (get_user(kurb->type, &uurb->type) ||
1182             __get_user(kurb->endpoint, &uurb->endpoint) ||
1183             __get_user(kurb->status, &uurb->status) ||
1184             __get_user(kurb->flags, &uurb->flags) ||
1185             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1186             __get_user(kurb->actual_length, &uurb->actual_length) ||
1187             __get_user(kurb->start_frame, &uurb->start_frame) ||
1188             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1189             __get_user(kurb->error_count, &uurb->error_count) ||
1190             __get_user(kurb->signr, &uurb->signr))
1191                 return -EFAULT;
1192
1193         if (__get_user(uptr, &uurb->buffer))
1194                 return -EFAULT;
1195         kurb->buffer = compat_ptr(uptr);
1196         if (__get_user(uptr, &uurb->buffer))
1197                 return -EFAULT;
1198         kurb->usercontext = compat_ptr(uptr);
1199
1200         return 0;
1201 }
1202
1203 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1204 {
1205         struct usbdevfs_urb uurb;
1206
1207         if (get_urb32(&uurb,(struct usbdevfs_urb32 *)arg))
1208                 return -EFAULT;
1209
1210         return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg);
1211 }
1212
1213 static int processcompl_compat(struct async *as, void __user * __user *arg)
1214 {
1215         struct urb *urb = as->urb;
1216         struct usbdevfs_urb32 __user *userurb = as->userurb;
1217         void __user *addr = as->userurb;
1218         unsigned int i;
1219
1220         if (as->userbuffer)
1221                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1222                         return -EFAULT;
1223         if (put_user(urb->status, &userurb->status))
1224                 return -EFAULT;
1225         if (put_user(urb->actual_length, &userurb->actual_length))
1226                 return -EFAULT;
1227         if (put_user(urb->error_count, &userurb->error_count))
1228                 return -EFAULT;
1229
1230         if (usb_pipeisoc(urb->pipe)) {
1231                 for (i = 0; i < urb->number_of_packets; i++) {
1232                         if (put_user(urb->iso_frame_desc[i].actual_length,
1233                                      &userurb->iso_frame_desc[i].actual_length))
1234                                 return -EFAULT;
1235                         if (put_user(urb->iso_frame_desc[i].status,
1236                                      &userurb->iso_frame_desc[i].status))
1237                                 return -EFAULT;
1238                 }
1239         }
1240
1241         free_async(as);
1242         if (put_user((u32)(u64)addr, (u32 __user *)arg))
1243                 return -EFAULT;
1244         return 0;
1245 }
1246
1247 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1248 {
1249         struct async *as = reap_as(ps);
1250         if (as)
1251                 return processcompl_compat(as, (void __user * __user *)arg);
1252         if (signal_pending(current))
1253                 return -EINTR;
1254         return -EIO;
1255 }
1256
1257 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1258 {
1259         struct async *as;
1260
1261         if (!(as = async_getcompleted(ps)))
1262                 return -EAGAIN;
1263         return processcompl_compat(as, (void __user * __user *)arg);
1264 }
1265
1266 #endif
1267
1268 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1269 {
1270         struct usbdevfs_disconnectsignal ds;
1271
1272         if (copy_from_user(&ds, arg, sizeof(ds)))
1273                 return -EFAULT;
1274         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1275                 return -EINVAL;
1276         ps->discsignr = ds.signr;
1277         ps->disccontext = ds.context;
1278         return 0;
1279 }
1280
1281 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1282 {
1283         unsigned int ifnum;
1284
1285         if (get_user(ifnum, (unsigned int __user *)arg))
1286                 return -EFAULT;
1287         return claimintf(ps, ifnum);
1288 }
1289
1290 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1291 {
1292         unsigned int ifnum;
1293         int ret;
1294
1295         if (get_user(ifnum, (unsigned int __user *)arg))
1296                 return -EFAULT;
1297         if ((ret = releaseintf(ps, ifnum)) < 0)
1298                 return ret;
1299         destroy_async_on_interface (ps, ifnum);
1300         return 0;
1301 }
1302
1303 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1304 {
1305         int                     size;
1306         void                    *buf = NULL;
1307         int                     retval = 0;
1308         struct usb_interface    *intf = NULL;
1309         struct usb_driver       *driver = NULL;
1310
1311         /* alloc buffer */
1312         if ((size = _IOC_SIZE (ctl->ioctl_code)) > 0) {
1313                 if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
1314                         return -ENOMEM;
1315                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1316                         if (copy_from_user (buf, ctl->data, size)) {
1317                                 kfree(buf);
1318                                 return -EFAULT;
1319                         }
1320                 } else {
1321                         memset (buf, 0, size);
1322                 }
1323         }
1324
1325         if (!connected(ps->dev)) {
1326                 kfree(buf);
1327                 return -ENODEV;
1328         }
1329
1330         if (ps->dev->state != USB_STATE_CONFIGURED)
1331                 retval = -EHOSTUNREACH;
1332         else if (!(intf = usb_ifnum_to_if (ps->dev, ctl->ifno)))
1333                retval = -EINVAL;
1334         else switch (ctl->ioctl_code) {
1335
1336         /* disconnect kernel driver from interface */
1337         case USBDEVFS_DISCONNECT:
1338
1339                 down_write(&usb_bus_type.subsys.rwsem);
1340                 if (intf->dev.driver) {
1341                         driver = to_usb_driver(intf->dev.driver);
1342                         dev_dbg (&intf->dev, "disconnect by usbfs\n");
1343                         usb_driver_release_interface(driver, intf);
1344                 } else
1345                         retval = -ENODATA;
1346                 up_write(&usb_bus_type.subsys.rwsem);
1347                 break;
1348
1349         /* let kernel drivers try to (re)bind to the interface */
1350         case USBDEVFS_CONNECT:
1351                 usb_unlock_device(ps->dev);
1352                 bus_rescan_devices(intf->dev.bus);
1353                 usb_lock_device(ps->dev);
1354                 break;
1355
1356         /* talk directly to the interface's driver */
1357         default:
1358                 down_read(&usb_bus_type.subsys.rwsem);
1359                 if (intf->dev.driver)
1360                         driver = to_usb_driver(intf->dev.driver);
1361                 if (driver == NULL || driver->ioctl == NULL) {
1362                         retval = -ENOTTY;
1363                 } else {
1364                         retval = driver->ioctl (intf, ctl->ioctl_code, buf);
1365                         if (retval == -ENOIOCTLCMD)
1366                                 retval = -ENOTTY;
1367                 }
1368                 up_read(&usb_bus_type.subsys.rwsem);
1369         }
1370
1371         /* cleanup and return */
1372         if (retval >= 0
1373                         && (_IOC_DIR (ctl->ioctl_code) & _IOC_READ) != 0
1374                         && size > 0
1375                         && copy_to_user (ctl->data, buf, size) != 0)
1376                 retval = -EFAULT;
1377
1378         kfree(buf);
1379         return retval;
1380 }
1381
1382 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1383 {
1384         struct usbdevfs_ioctl   ctrl;
1385
1386         if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
1387                 return -EFAULT;
1388         return proc_ioctl(ps, &ctrl);
1389 }
1390
1391 #ifdef CONFIG_COMPAT
1392 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1393 {
1394         struct usbdevfs_ioctl32 __user *uioc;
1395         struct usbdevfs_ioctl ctrl;
1396         u32 udata;
1397
1398         uioc = compat_ptr((long)arg);
1399         if (get_user(ctrl.ifno, &uioc->ifno) ||
1400             get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1401             __get_user(udata, &uioc->data))
1402                 return -EFAULT;
1403         ctrl.data = compat_ptr(udata);
1404
1405         return proc_ioctl(ps, &ctrl);
1406 }
1407 #endif
1408
1409 /*
1410  * NOTE:  All requests here that have interface numbers as parameters
1411  * are assuming that somehow the configuration has been prevented from
1412  * changing.  But there's no mechanism to ensure that...
1413  */
1414 static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1415 {
1416         struct dev_state *ps = (struct dev_state *)file->private_data;
1417         struct usb_device *dev = ps->dev;
1418         void __user *p = (void __user *)arg;
1419         int ret = -ENOTTY;
1420
1421         if (!(file->f_mode & FMODE_WRITE))
1422                 return -EPERM;
1423         usb_lock_device(dev);
1424         if (!connected(dev)) {
1425                 usb_unlock_device(dev);
1426                 return -ENODEV;
1427         }
1428
1429         switch (cmd) {
1430         case USBDEVFS_CONTROL:
1431                 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
1432                 ret = proc_control(ps, p);
1433                 if (ret >= 0)
1434                         inode->i_mtime = CURRENT_TIME;
1435                 break;
1436
1437         case USBDEVFS_BULK:
1438                 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
1439                 ret = proc_bulk(ps, p);
1440                 if (ret >= 0)
1441                         inode->i_mtime = CURRENT_TIME;
1442                 break;
1443
1444         case USBDEVFS_RESETEP:
1445                 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
1446                 ret = proc_resetep(ps, p);
1447                 if (ret >= 0)
1448                         inode->i_mtime = CURRENT_TIME;
1449                 break;
1450
1451         case USBDEVFS_RESET:
1452                 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
1453                 ret = proc_resetdevice(ps);
1454                 break;
1455
1456         case USBDEVFS_CLEAR_HALT:
1457                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
1458                 ret = proc_clearhalt(ps, p);
1459                 if (ret >= 0)
1460                         inode->i_mtime = CURRENT_TIME;
1461                 break;
1462
1463         case USBDEVFS_GETDRIVER:
1464                 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
1465                 ret = proc_getdriver(ps, p);
1466                 break;
1467
1468         case USBDEVFS_CONNECTINFO:
1469                 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
1470                 ret = proc_connectinfo(ps, p);
1471                 break;
1472
1473         case USBDEVFS_SETINTERFACE:
1474                 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
1475                 ret = proc_setintf(ps, p);
1476                 break;
1477
1478         case USBDEVFS_SETCONFIGURATION:
1479                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
1480                 ret = proc_setconfig(ps, p);
1481                 break;
1482
1483         case USBDEVFS_SUBMITURB:
1484                 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
1485                 ret = proc_submiturb(ps, p);
1486                 if (ret >= 0)
1487                         inode->i_mtime = CURRENT_TIME;
1488                 break;
1489
1490 #ifdef CONFIG_COMPAT
1491
1492         case USBDEVFS_SUBMITURB32:
1493                 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
1494                 ret = proc_submiturb_compat(ps, p);
1495                 if (ret >= 0)
1496                         inode->i_mtime = CURRENT_TIME;
1497                 break;
1498
1499         case USBDEVFS_REAPURB32:
1500                 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
1501                 ret = proc_reapurb_compat(ps, p);
1502                 break;
1503
1504         case USBDEVFS_REAPURBNDELAY32:
1505                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
1506                 ret = proc_reapurbnonblock_compat(ps, p);
1507                 break;
1508
1509         case USBDEVFS_IOCTL32:
1510                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1511                 ret = proc_ioctl_compat(ps, (compat_uptr_t)(long)p);
1512                 break;
1513 #endif
1514
1515         case USBDEVFS_DISCARDURB:
1516                 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
1517                 ret = proc_unlinkurb(ps, p);
1518                 break;
1519
1520         case USBDEVFS_REAPURB:
1521                 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
1522                 ret = proc_reapurb(ps, p);
1523                 break;
1524
1525         case USBDEVFS_REAPURBNDELAY:
1526                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
1527                 ret = proc_reapurbnonblock(ps, p);
1528                 break;
1529
1530         case USBDEVFS_DISCSIGNAL:
1531                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
1532                 ret = proc_disconnectsignal(ps, p);
1533                 break;
1534
1535         case USBDEVFS_CLAIMINTERFACE:
1536                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
1537                 ret = proc_claiminterface(ps, p);
1538                 break;
1539
1540         case USBDEVFS_RELEASEINTERFACE:
1541                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
1542                 ret = proc_releaseinterface(ps, p);
1543                 break;
1544
1545         case USBDEVFS_IOCTL:
1546                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1547                 ret = proc_ioctl_default(ps, p);
1548                 break;
1549         }
1550         usb_unlock_device(dev);
1551         if (ret >= 0)
1552                 inode->i_atime = CURRENT_TIME;
1553         return ret;
1554 }
1555
1556 /* No kernel lock - fine */
1557 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
1558 {
1559         struct dev_state *ps = (struct dev_state *)file->private_data;
1560         unsigned int mask = 0;
1561
1562         poll_wait(file, &ps->wait, wait);
1563         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1564                 mask |= POLLOUT | POLLWRNORM;
1565         if (!connected(ps->dev))
1566                 mask |= POLLERR | POLLHUP;
1567         return mask;
1568 }
1569
1570 struct file_operations usbfs_device_file_operations = {
1571         .llseek =       usbdev_lseek,
1572         .read =         usbdev_read,
1573         .poll =         usbdev_poll,
1574         .ioctl =        usbdev_ioctl,
1575         .open =         usbdev_open,
1576         .release =      usbdev_release,
1577 };
1578
1579 static void usbdev_add(struct usb_device *dev)
1580 {
1581         int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1582
1583         dev->class_dev = class_device_create(usb_device_class, NULL,
1584                                 MKDEV(USB_DEVICE_MAJOR, minor), &dev->dev,
1585                                 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1586
1587         dev->class_dev->class_data = dev;
1588 }
1589
1590 static void usbdev_remove(struct usb_device *dev)
1591 {
1592         class_device_unregister(dev->class_dev);
1593 }
1594
1595 static int usbdev_notify(struct notifier_block *self, unsigned long action,
1596                          void *dev)
1597 {
1598         switch (action) {
1599         case USB_DEVICE_ADD:
1600                 usbdev_add(dev);
1601                 break;
1602         case USB_DEVICE_REMOVE:
1603                 usbdev_remove(dev);
1604                 break;
1605         }
1606         return NOTIFY_OK;
1607 }
1608
1609 static struct notifier_block usbdev_nb = {
1610         .notifier_call =        usbdev_notify,
1611 };
1612
1613 static struct cdev usb_device_cdev = {
1614         .kobj   = {.name = "usb_device", },
1615         .owner  = THIS_MODULE,
1616 };
1617
1618 int __init usbdev_init(void)
1619 {
1620         int retval;
1621
1622         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1623                         "usb_device");
1624         if (retval) {
1625                 err("unable to register minors for usb_device");
1626                 goto out;
1627         }
1628         cdev_init(&usb_device_cdev, &usbfs_device_file_operations);
1629         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1630         if (retval) {
1631                 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1632                 goto error_cdev;
1633         }
1634         usb_device_class = class_create(THIS_MODULE, "usb_device");
1635         if (IS_ERR(usb_device_class)) {
1636                 err("unable to register usb_device class");
1637                 retval = PTR_ERR(usb_device_class);
1638                 goto error_class;
1639         }
1640
1641         usb_register_notify(&usbdev_nb);
1642
1643 out:
1644         return retval;
1645
1646 error_class:
1647         usb_device_class = NULL;
1648         cdev_del(&usb_device_cdev);
1649
1650 error_cdev:
1651         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1652         goto out;
1653 }
1654
1655 void usbdev_cleanup(void)
1656 {
1657         usb_unregister_notify(&usbdev_nb);
1658         class_destroy(usb_device_class);
1659         cdev_del(&usb_device_cdev);
1660         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1661 }
1662