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 static struct class *usb_device_class;
  61
  62 struct async {
  63         struct list_head asynclist;
  64         struct dev_state *ps;
  65         pid_t pid;
  66         uid_t uid, euid;
  67         unsigned int signr;
  68         unsigned int ifnum;
  69         void __user *userbuffer;
  70         void __user *userurb;
  71         struct urb *urb;
  72         u32 secid;
  73 };
  74
  75 static int usbfs_snoop = 0;
  76 module_param (usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  77 MODULE_PARM_DESC (usbfs_snoop, "true to log all usbfs traffic");
  78
  79 #define snoop(dev, format, arg...)                              \
  80         do {                                                    \
  81                 if (usbfs_snoop)                                \
  82                         dev_info( dev , format , ## arg);       \
  83         } while (0)
  84
  85 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
  86
  87
  88 #define MAX_USBFS_BUFFER_SIZE   16384
  89
  90 static inline int connected (struct usb_device *dev)
  91 {
  92         return dev->state != USB_STATE_NOTATTACHED;
  93 }
  94
  95 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
  96 {
  97         loff_t ret;
  98
  99         lock_kernel();
 100
 101         switch (orig) {
 102         case 0:
 103                 file->f_pos = offset;
 104                 ret = file->f_pos;
 105                 break;
 106         case 1:
 107                 file->f_pos += offset;
 108                 ret = file->f_pos;
 109                 break;
 110         case 2:
 111         default:
 112                 ret = -EINVAL;
 113         }
 114
 115         unlock_kernel();
 116         return ret;
 117 }
 118
 119 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
 120 {
 121         struct dev_state *ps = (struct dev_state *)file->private_data;
 122         struct usb_device *dev = ps->dev;
 123         ssize_t ret = 0;
 124         unsigned len;
 125         loff_t pos;
 126         int i;
 127
 128         pos = *ppos;
 129         usb_lock_device(dev);
 130         if (!connected(dev)) {
 131                 ret = -ENODEV;
 132                 goto err;
 133         } else if (pos < 0) {
 134                 ret = -EINVAL;
 135                 goto err;
 136         }
 137
 138         if (pos < sizeof(struct usb_device_descriptor)) {
 139                 struct usb_device_descriptor temp_desc ; /* 18 bytes - fits on the stack */
 140
 141                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 142                 le16_to_cpus(&temp_desc.bcdUSB);
 143                 le16_to_cpus(&temp_desc.idVendor);
 144                 le16_to_cpus(&temp_desc.idProduct);
 145                 le16_to_cpus(&temp_desc.bcdDevice);
 146
 147                 len = sizeof(struct usb_device_descriptor) - pos;
 148                 if (len > nbytes)
 149                         len = nbytes;
 150                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 151                         ret = -EFAULT;
 152                         goto err;
 153                 }
 154
 155                 *ppos += len;
 156                 buf += len;
 157                 nbytes -= len;
 158                 ret += len;
 159         }
 160
 161         pos = sizeof(struct usb_device_descriptor);
 162         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 163                 struct usb_config_descriptor *config =
 164                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 165                 unsigned int length = le16_to_cpu(config->wTotalLength);
 166
 167                 if (*ppos < pos + length) {
 168
 169                         /* The descriptor may claim to be longer than it
 170                          * really is.  Here is the actual allocated length. */
 171                         unsigned alloclen =
 172                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 173
 174                         len = length - (*ppos - pos);
 175                         if (len > nbytes)
 176                                 len = nbytes;
 177
 178                         /* Simply don't write (skip over) unallocated parts */
 179                         if (alloclen > (*ppos - pos)) {
 180                                 alloclen -= (*ppos - pos);
 181                                 if (copy_to_user(buf,
 182                                     dev->rawdescriptors[i] + (*ppos - pos),
 183                                     min(len, alloclen))) {
 184                                         ret = -EFAULT;
 185                                         goto err;
 186                                 }
 187                         }
 188
 189                         *ppos += len;
 190                         buf += len;
 191                         nbytes -= len;
 192                         ret += len;
 193                 }
 194
 195                 pos += length;
 196         }
 197
 198 err:
 199         usb_unlock_device(dev);
 200         return ret;
 201 }
 202
 203 /*
 204  * async list handling
 205  */
 206
 207 static struct async *alloc_async(unsigned int numisoframes)
 208 {
 209         unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor);
 210         struct async *as = kzalloc(assize, GFP_KERNEL);
 211
 212         if (!as)
 213                 return NULL;
 214         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 215         if (!as->urb) {
 216                 kfree(as);
 217                 return NULL;
 218         }
 219         return as;
 220 }
 221
 222 static void free_async(struct async *as)
 223 {
 224         kfree(as->urb->transfer_buffer);
 225         kfree(as->urb->setup_packet);
 226         usb_free_urb(as->urb);
 227         kfree(as);
 228 }
 229
 230 static inline void async_newpending(struct async *as)
 231 {
 232         struct dev_state *ps = as->ps;
 233         unsigned long flags;
 234
 235         spin_lock_irqsave(&ps->lock, flags);
 236         list_add_tail(&as->asynclist, &ps->async_pending);
 237         spin_unlock_irqrestore(&ps->lock, flags);
 238 }
 239
 240 static inline void async_removepending(struct async *as)
 241 {
 242         struct dev_state *ps = as->ps;
 243         unsigned long flags;
 244
 245         spin_lock_irqsave(&ps->lock, flags);
 246         list_del_init(&as->asynclist);
 247         spin_unlock_irqrestore(&ps->lock, flags);
 248 }
 249
 250 static inline struct async *async_getcompleted(struct dev_state *ps)
 251 {
 252         unsigned long flags;
 253         struct async *as = NULL;
 254
 255         spin_lock_irqsave(&ps->lock, flags);
 256         if (!list_empty(&ps->async_completed)) {
 257                 as = list_entry(ps->async_completed.next, struct async, asynclist);
 258                 list_del_init(&as->asynclist);
 259         }
 260         spin_unlock_irqrestore(&ps->lock, flags);
 261         return as;
 262 }
 263
 264 static inline struct async *async_getpending(struct dev_state *ps, void __user *userurb)
 265 {
 266         unsigned long flags;
 267         struct async *as;
 268
 269         spin_lock_irqsave(&ps->lock, flags);
 270         list_for_each_entry(as, &ps->async_pending, asynclist)
 271                 if (as->userurb == userurb) {
 272                         list_del_init(&as->asynclist);
 273                         spin_unlock_irqrestore(&ps->lock, flags);
 274                         return as;
 275                 }
 276         spin_unlock_irqrestore(&ps->lock, flags);
 277         return NULL;
 278 }
 279
 280 static void snoop_urb(struct urb *urb, void __user *userurb)
 281 {
 282         int j;
 283         unsigned char *data = urb->transfer_buffer;
 284
 285         if (!usbfs_snoop)
 286                 return;
 287
 288         if (urb->pipe & USB_DIR_IN)
 289                 dev_info(&urb->dev->dev, "direction=IN\n");
 290         else
 291                 dev_info(&urb->dev->dev, "direction=OUT\n");
 292         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
 293         dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
 294                  urb->transfer_buffer_length);
 295         dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
 296         dev_info(&urb->dev->dev, "data: ");
 297         for (j = 0; j < urb->transfer_buffer_length; ++j)
 298                 printk ("%02x ", data[j]);
 299         printk("\n");
 300 }
 301
 302 static void async_completed(struct urb *urb, struct pt_regs *regs)
 303 {
 304         struct async *as = (struct async *)urb->context;
 305         struct dev_state *ps = as->ps;
 306         struct siginfo sinfo;
 307
 308         spin_lock(&ps->lock);
 309         list_move_tail(&as->asynclist, &ps->async_completed);
 310         spin_unlock(&ps->lock);
 311         if (as->signr) {
 312                 sinfo.si_signo = as->signr;
 313                 sinfo.si_errno = as->urb->status;
 314                 sinfo.si_code = SI_ASYNCIO;
 315                 sinfo.si_addr = as->userurb;
 316                 kill_proc_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
 317                                       as->euid, as->secid);
 318         }
 319         snoop(&urb->dev->dev, "urb complete\n");
 320         snoop_urb(urb, as->userurb);
 321         wake_up(&ps->wait);
 322 }
 323
 324 static void destroy_async (struct dev_state *ps, struct list_head *list)
 325 {
 326         struct async *as;
 327         unsigned long flags;
 328
 329         spin_lock_irqsave(&ps->lock, flags);
 330         while (!list_empty(list)) {
 331                 as = list_entry(list->next, struct async, asynclist);
 332                 list_del_init(&as->asynclist);
 333
 334                 /* drop the spinlock so the completion handler can run */
 335                 spin_unlock_irqrestore(&ps->lock, flags);
 336                 usb_kill_urb(as->urb);
 337                 spin_lock_irqsave(&ps->lock, flags);
 338         }
 339         spin_unlock_irqrestore(&ps->lock, flags);
 340         as = async_getcompleted(ps);
 341         while (as) {
 342                 free_async(as);
 343                 as = async_getcompleted(ps);
 344         }
 345 }
 346
 347 static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum)
 348 {
 349         struct list_head *p, *q, hitlist;
 350         unsigned long flags;
 351
 352         INIT_LIST_HEAD(&hitlist);
 353         spin_lock_irqsave(&ps->lock, flags);
 354         list_for_each_safe(p, q, &ps->async_pending)
 355                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 356                         list_move_tail(p, &hitlist);
 357         spin_unlock_irqrestore(&ps->lock, flags);
 358         destroy_async(ps, &hitlist);
 359 }
 360
 361 static inline void destroy_all_async(struct dev_state *ps)
 362 {
 363                 destroy_async(ps, &ps->async_pending);
 364 }
 365
 366 /*
 367  * interface claims are made only at the request of user level code,
 368  * which can also release them (explicitly or by closing files).
 369  * they're also undone when devices disconnect.
 370  */
 371
 372 static int driver_probe (struct usb_interface *intf,
 373                          const struct usb_device_id *id)
 374 {
 375         return -ENODEV;
 376 }
 377
 378 static void driver_disconnect(struct usb_interface *intf)
 379 {
 380         struct dev_state *ps = usb_get_intfdata (intf);
 381         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 382
 383         if (!ps)
 384                 return;
 385
 386         /* NOTE:  this relies on usbcore having canceled and completed
 387          * all pending I/O requests; 2.6 does that.
 388          */
 389
 390         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 391                 clear_bit(ifnum, &ps->ifclaimed);
 392         else
 393                 warn("interface number %u out of range", ifnum);
 394
 395         usb_set_intfdata (intf, NULL);
 396
 397         /* force async requests to complete */
 398         destroy_async_on_interface(ps, ifnum);
 399 }
 400
 401 struct usb_driver usbfs_driver = {
 402         .name =         "usbfs",
 403         .probe =        driver_probe,
 404         .disconnect =   driver_disconnect,
 405 };
 406
 407 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 408 {
 409         struct usb_device *dev = ps->dev;
 410         struct usb_interface *intf;
 411         int err;
 412
 413         if (ifnum >= 8*sizeof(ps->ifclaimed))
 414                 return -EINVAL;
 415         /* already claimed */
 416         if (test_bit(ifnum, &ps->ifclaimed))
 417                 return 0;
 418
 419         /* lock against other changes to driver bindings */
 420         down_write(&usb_bus_type.subsys.rwsem);
 421         intf = usb_ifnum_to_if(dev, ifnum);
 422         if (!intf)
 423                 err = -ENOENT;
 424         else
 425                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 426         up_write(&usb_bus_type.subsys.rwsem);
 427         if (err == 0)
 428                 set_bit(ifnum, &ps->ifclaimed);
 429         return err;
 430 }
 431
 432 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 433 {
 434         struct usb_device *dev;
 435         struct usb_interface *intf;
 436         int err;
 437
 438         err = -EINVAL;
 439         if (ifnum >= 8*sizeof(ps->ifclaimed))
 440                 return err;
 441         dev = ps->dev;
 442         /* lock against other changes to driver bindings */
 443         down_write(&usb_bus_type.subsys.rwsem);
 444         intf = usb_ifnum_to_if(dev, ifnum);
 445         if (!intf)
 446                 err = -ENOENT;
 447         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 448                 usb_driver_release_interface(&usbfs_driver, intf);
 449                 err = 0;
 450         }
 451         up_write(&usb_bus_type.subsys.rwsem);
 452         return err;
 453 }
 454
 455 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 456 {
 457         if (ps->dev->state != USB_STATE_CONFIGURED)
 458                 return -EHOSTUNREACH;
 459         if (ifnum >= 8*sizeof(ps->ifclaimed))
 460                 return -EINVAL;
 461         if (test_bit(ifnum, &ps->ifclaimed))
 462                 return 0;
 463         /* if not yet claimed, claim it for the driver */
 464         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n",
 465                current->pid, current->comm, ifnum);
 466         return claimintf(ps, ifnum);
 467 }
 468
 469 static int findintfep(struct usb_device *dev, unsigned int ep)
 470 {
 471         unsigned int i, j, e;
 472         struct usb_interface *intf;
 473         struct usb_host_interface *alts;
 474         struct usb_endpoint_descriptor *endpt;
 475
 476         if (ep & ~(USB_DIR_IN|0xf))
 477                 return -EINVAL;
 478         if (!dev->actconfig)
 479                 return -ESRCH;
 480         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 481                 intf = dev->actconfig->interface[i];
 482                 for (j = 0; j < intf->num_altsetting; j++) {
 483                         alts = &intf->altsetting[j];
 484                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 485                                 endpt = &alts->endpoint[e].desc;
 486                                 if (endpt->bEndpointAddress == ep)
 487                                         return alts->desc.bInterfaceNumber;
 488                         }
 489                 }
 490         }
 491         return -ENOENT;
 492 }
 493
 494 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
 495 {
 496         int ret = 0;
 497
 498         if (ps->dev->state != USB_STATE_ADDRESS
 499          && ps->dev->state != USB_STATE_CONFIGURED)
 500                 return -EHOSTUNREACH;
 501         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 502                 return 0;
 503
 504         index &= 0xff;
 505         switch (requesttype & USB_RECIP_MASK) {
 506         case USB_RECIP_ENDPOINT:
 507                 if ((ret = findintfep(ps->dev, index)) >= 0)
 508                         ret = checkintf(ps, ret);
 509                 break;
 510
 511         case USB_RECIP_INTERFACE:
 512                 ret = checkintf(ps, index);
 513                 break;
 514         }
 515         return ret;
 516 }
 517
 518 static struct usb_device *usbdev_lookup_minor(int minor)
 519 {
 520         struct class_device *class_dev;
 521         struct usb_device *dev = NULL;
 522
 523         down(&usb_device_class->sem);
 524         list_for_each_entry(class_dev, &usb_device_class->children, node) {
 525                 if (class_dev->devt == MKDEV(USB_DEVICE_MAJOR, minor)) {
 526                         dev = class_dev->class_data;
 527                         break;
 528                 }
 529         }
 530         up(&usb_device_class->sem);
 531
 532         return dev;
 533 };
 534
 535 /*
 536  * file operations
 537  */
 538 static int usbdev_open(struct inode *inode, struct file *file)
 539 {
 540         struct usb_device *dev = NULL;
 541         struct dev_state *ps;
 542         int ret;
 543
 544         /*
 545          * no locking necessary here, as chrdev_open has the kernel lock
 546          * (still acquire the kernel lock for safety)
 547          */
 548         ret = -ENOMEM;
 549         if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
 550                 goto out_nolock;
 551
 552         lock_kernel();
 553         ret = -ENOENT;
 554         /* check if we are called from a real node or usbfs */
 555         if (imajor(inode) == USB_DEVICE_MAJOR)
 556                 dev = usbdev_lookup_minor(iminor(inode));
 557         if (!dev)
 558                 dev = inode->i_private;
 559         if (!dev) {
 560                 kfree(ps);
 561                 goto out;
 562         }
 563         usb_get_dev(dev);
 564         ret = 0;
 565         ps->dev = dev;
 566         ps->file = file;
 567         spin_lock_init(&ps->lock);
 568         INIT_LIST_HEAD(&ps->async_pending);
 569         INIT_LIST_HEAD(&ps->async_completed);
 570         init_waitqueue_head(&ps->wait);
 571         ps->discsignr = 0;
 572         ps->disc_pid = current->pid;
 573         ps->disc_uid = current->uid;
 574         ps->disc_euid = current->euid;
 575         ps->disccontext = NULL;
 576         ps->ifclaimed = 0;
 577         security_task_getsecid(current, &ps->secid);
 578         wmb();
 579         list_add_tail(&ps->list, &dev->filelist);
 580         file->private_data = ps;
 581  out:
 582         unlock_kernel();
 583  out_nolock:
 584         return ret;
 585 }
 586
 587 static int usbdev_release(struct inode *inode, struct file *file)
 588 {
 589         struct dev_state *ps = (struct dev_state *)file->private_data;
 590         struct usb_device *dev = ps->dev;
 591         unsigned int ifnum;
 592
 593         usb_lock_device(dev);
 594         list_del_init(&ps->list);
 595         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 596                         ifnum++) {
 597                 if (test_bit(ifnum, &ps->ifclaimed))
 598                         releaseintf(ps, ifnum);
 599         }
 600         destroy_all_async(ps);
 601         usb_unlock_device(dev);
 602         usb_put_dev(dev);
 603         ps->dev = NULL;
 604         kfree(ps);
 605         return 0;
 606 }
 607
 608 static int proc_control(struct dev_state *ps, void __user *arg)
 609 {
 610         struct usb_device *dev = ps->dev;
 611         struct usbdevfs_ctrltransfer ctrl;
 612         unsigned int tmo;
 613         unsigned char *tbuf;
 614         int i, j, ret;
 615
 616         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 617                 return -EFAULT;
 618         if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
 619                 return ret;
 620         if (ctrl.wLength > PAGE_SIZE)
 621                 return -EINVAL;
 622         if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
 623                 return -ENOMEM;
 624         tmo = ctrl.timeout;
 625         if (ctrl.bRequestType & 0x80) {
 626                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
 627                         free_page((unsigned long)tbuf);
 628                         return -EINVAL;
 629                 }
 630                 snoop(&dev->dev, "control read: bRequest=%02x "
 631                                 "bRrequestType=%02x wValue=%04x "
 632                                 "wIndex=%04x wLength=%04x\n",
 633                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 634                                 ctrl.wIndex, ctrl.wLength);
 635
 636                 usb_unlock_device(dev);
 637                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 638                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 639                 usb_lock_device(dev);
 640                 if ((i > 0) && ctrl.wLength) {
 641                         if (usbfs_snoop) {
 642                                 dev_info(&dev->dev, "control read: data ");
 643                                 for (j = 0; j < i; ++j)
 644                                         printk("%02x ", (unsigned char)(tbuf)[j]);
 645                                 printk("\n");
 646                         }
 647                         if (copy_to_user(ctrl.data, tbuf, i)) {
 648                                 free_page((unsigned long)tbuf);
 649                                 return -EFAULT;
 650                         }
 651                 }
 652         } else {
 653                 if (ctrl.wLength) {
 654                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 655                                 free_page((unsigned long)tbuf);
 656                                 return -EFAULT;
 657                         }
 658                 }
 659                 snoop(&dev->dev, "control write: bRequest=%02x "
 660                                 "bRrequestType=%02x wValue=%04x "
 661                                 "wIndex=%04x wLength=%04x\n",
 662                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 663                                 ctrl.wIndex, ctrl.wLength);
 664                 if (usbfs_snoop) {
 665                         dev_info(&dev->dev, "control write: data: ");
 666                         for (j = 0; j < ctrl.wLength; ++j)
 667                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 668                         printk("\n");
 669                 }
 670                 usb_unlock_device(dev);
 671                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 672                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 673                 usb_lock_device(dev);
 674         }
 675         free_page((unsigned long)tbuf);
 676         if (i<0 && i != -EPIPE) {
 677                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 678                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 679                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 680                            ctrl.wLength, i);
 681         }
 682         return i;
 683 }
 684
 685 static int proc_bulk(struct dev_state *ps, void __user *arg)
 686 {
 687         struct usb_device *dev = ps->dev;
 688         struct usbdevfs_bulktransfer bulk;
 689         unsigned int tmo, len1, pipe;
 690         int len2;
 691         unsigned char *tbuf;
 692         int i, j, ret;
 693
 694         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 695                 return -EFAULT;
 696         if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
 697                 return ret;
 698         if ((ret = checkintf(ps, ret)))
 699                 return ret;
 700         if (bulk.ep & USB_DIR_IN)
 701                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 702         else
 703                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 704         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 705                 return -EINVAL;
 706         len1 = bulk.len;
 707         if (len1 > MAX_USBFS_BUFFER_SIZE)
 708                 return -EINVAL;
 709         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 710                 return -ENOMEM;
 711         tmo = bulk.timeout;
 712         if (bulk.ep & 0x80) {
 713                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 714                         kfree(tbuf);
 715                         return -EINVAL;
 716                 }
 717                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
 718                         bulk.len, bulk.timeout);
 719                 usb_unlock_device(dev);
 720                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 721                 usb_lock_device(dev);
 722                 if (!i && len2) {
 723                         if (usbfs_snoop) {
 724                                 dev_info(&dev->dev, "bulk read: data ");
 725                                 for (j = 0; j < len2; ++j)
 726                                         printk("%02x ", (unsigned char)(tbuf)[j]);
 727                                 printk("\n");
 728                         }
 729                         if (copy_to_user(bulk.data, tbuf, len2)) {
 730                                 kfree(tbuf);
 731                                 return -EFAULT;
 732                         }
 733                 }
 734         } else {
 735                 if (len1) {
 736                         if (copy_from_user(tbuf, bulk.data, len1)) {
 737                                 kfree(tbuf);
 738                                 return -EFAULT;
 739                         }
 740                 }
 741                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
 742                         bulk.len, bulk.timeout);
 743                 if (usbfs_snoop) {
 744                         dev_info(&dev->dev, "bulk write: data: ");
 745                         for (j = 0; j < len1; ++j)
 746                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 747                         printk("\n");
 748                 }
 749                 usb_unlock_device(dev);
 750                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 751                 usb_lock_device(dev);
 752         }
 753         kfree(tbuf);
 754         if (i < 0)
 755                 return i;
 756         return len2;
 757 }
 758
 759 static int proc_resetep(struct dev_state *ps, void __user *arg)
 760 {
 761         unsigned int ep;
 762         int ret;
 763
 764         if (get_user(ep, (unsigned int __user *)arg))
 765                 return -EFAULT;
 766         if ((ret = findintfep(ps->dev, ep)) < 0)
 767                 return ret;
 768         if ((ret = checkintf(ps, ret)))
 769                 return ret;
 770         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
 771         return 0;
 772 }
 773
 774 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 775 {
 776         unsigned int ep;
 777         int pipe;
 778         int ret;
 779
 780         if (get_user(ep, (unsigned int __user *)arg))
 781                 return -EFAULT;
 782         if ((ret = findintfep(ps->dev, ep)) < 0)
 783                 return ret;
 784         if ((ret = checkintf(ps, ret)))
 785                 return ret;
 786         if (ep & USB_DIR_IN)
 787                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 788         else
 789                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 790
 791         return usb_clear_halt(ps->dev, pipe);
 792 }
 793
 794
 795 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 796 {
 797         struct usbdevfs_getdriver gd;
 798         struct usb_interface *intf;
 799         int ret;
 800
 801         if (copy_from_user(&gd, arg, sizeof(gd)))
 802                 return -EFAULT;
 803         down_read(&usb_bus_type.subsys.rwsem);
 804         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 805         if (!intf || !intf->dev.driver)
 806                 ret = -ENODATA;
 807         else {
 808                 strncpy(gd.driver, intf->dev.driver->name,
 809                                 sizeof(gd.driver));
 810                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 811         }
 812         up_read(&usb_bus_type.subsys.rwsem);
 813         return ret;
 814 }
 815
 816 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 817 {
 818         struct usbdevfs_connectinfo ci;
 819
 820         ci.devnum = ps->dev->devnum;
 821         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 822         if (copy_to_user(arg, &ci, sizeof(ci)))
 823                 return -EFAULT;
 824         return 0;
 825 }
 826
 827 static int proc_resetdevice(struct dev_state *ps)
 828 {
 829         return usb_reset_composite_device(ps->dev, NULL);
 830 }
 831
 832 static int proc_setintf(struct dev_state *ps, void __user *arg)
 833 {
 834         struct usbdevfs_setinterface setintf;
 835         int ret;
 836
 837         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 838                 return -EFAULT;
 839         if ((ret = checkintf(ps, setintf.interface)))
 840                 return ret;
 841         return usb_set_interface(ps->dev, setintf.interface,
 842                         setintf.altsetting);
 843 }
 844
 845 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 846 {
 847         unsigned int u;
 848         int status = 0;
 849         struct usb_host_config *actconfig;
 850
 851         if (get_user(u, (unsigned int __user *)arg))
 852                 return -EFAULT;
 853
 854         actconfig = ps->dev->actconfig;
 855
 856         /* Don't touch the device if any interfaces are claimed.
 857          * It could interfere with other drivers' operations, and if
 858          * an interface is claimed by usbfs it could easily deadlock.
 859          */
 860         if (actconfig) {
 861                 int i;
 862
 863                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 864                         if (usb_interface_claimed(actconfig->interface[i])) {
 865                                 dev_warn (&ps->dev->dev,
 866                                         "usbfs: interface %d claimed by %s "
 867                                         "while '%s' sets config #%d\n",
 868                                         actconfig->interface[i]
 869                                                 ->cur_altsetting
 870                                                 ->desc.bInterfaceNumber,
 871                                         actconfig->interface[i]
 872                                                 ->dev.driver->name,
 873                                         current->comm, u);
 874                                 status = -EBUSY;
 875                                 break;
 876                         }
 877                 }
 878         }
 879
 880         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 881          * so avoid usb_set_configuration()'s kick to sysfs
 882          */
 883         if (status == 0) {
 884                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 885                         status = usb_reset_configuration(ps->dev);
 886                 else
 887                         status = usb_set_configuration(ps->dev, u);
 888         }
 889
 890         return status;
 891 }
 892
 893 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 894                              struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
 895                              void __user *arg)
 896 {
 897         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 898         struct usb_host_endpoint *ep;
 899         struct async *as;
 900         struct usb_ctrlrequest *dr = NULL;
 901         unsigned int u, totlen, isofrmlen;
 902         int ret, interval = 0, ifnum = -1;
 903
 904         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
 905                            URB_NO_FSBR|URB_ZERO_PACKET))
 906                 return -EINVAL;
 907         if (!uurb->buffer)
 908                 return -EINVAL;
 909         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
 910                 return -EINVAL;
 911         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
 912                 if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
 913                         return ifnum;
 914                 if ((ret = checkintf(ps, ifnum)))
 915                         return ret;
 916         }
 917         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0)
 918                 ep = ps->dev->ep_in [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 919         else
 920                 ep = ps->dev->ep_out [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 921         if (!ep)
 922                 return -ENOENT;
 923         switch(uurb->type) {
 924         case USBDEVFS_URB_TYPE_CONTROL:
 925                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 926                                 != USB_ENDPOINT_XFER_CONTROL)
 927                         return -EINVAL;
 928                 /* min 8 byte setup packet, max 8 byte setup plus an arbitrary data stage */
 929                 if (uurb->buffer_length < 8 || uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
 930                         return -EINVAL;
 931                 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
 932                         return -ENOMEM;
 933                 if (copy_from_user(dr, uurb->buffer, 8)) {
 934                         kfree(dr);
 935                         return -EFAULT;
 936                 }
 937                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
 938                         kfree(dr);
 939                         return -EINVAL;
 940                 }
 941                 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
 942                         kfree(dr);
 943                         return ret;
 944                 }
 945                 uurb->endpoint = (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK);
 946                 uurb->number_of_packets = 0;
 947                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
 948                 uurb->buffer += 8;
 949                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ?  VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) {
 950                         kfree(dr);
 951                         return -EFAULT;
 952                 }
 953                 snoop(&ps->dev->dev, "control urb\n");
 954                 break;
 955
 956         case USBDEVFS_URB_TYPE_BULK:
 957                 switch (ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 958                 case USB_ENDPOINT_XFER_CONTROL:
 959                 case USB_ENDPOINT_XFER_ISOC:
 960                         return -EINVAL;
 961                 /* allow single-shot interrupt transfers, at bogus rates */
 962                 }
 963                 uurb->number_of_packets = 0;
 964                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
 965                         return -EINVAL;
 966                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
 967                         return -EFAULT;
 968                 snoop(&ps->dev->dev, "bulk urb\n");
 969                 break;
 970
 971         case USBDEVFS_URB_TYPE_ISO:
 972                 /* arbitrary limit */
 973                 if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
 974                         return -EINVAL;
 975                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 976                                 != USB_ENDPOINT_XFER_ISOC)
 977                         return -EINVAL;
 978                 interval = 1 << min (15, ep->desc.bInterval - 1);
 979                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
 980                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
 981                         return -ENOMEM;
 982                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
 983                         kfree(isopkt);
 984                         return -EFAULT;
 985                 }
 986                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
 987                         /* arbitrary limit, sufficient for USB 2.0 high-bandwidth iso */
 988                         if (isopkt[u].length > 8192) {
 989                                 kfree(isopkt);
 990                                 return -EINVAL;
 991                         }
 992                         totlen += isopkt[u].length;
 993                 }
 994                 if (totlen > 32768) {
 995                         kfree(isopkt);
 996                         return -EINVAL;
 997                 }
 998                 uurb->buffer_length = totlen;
 999                 snoop(&ps->dev->dev, "iso urb\n");
1000                 break;
1001
1002         case USBDEVFS_URB_TYPE_INTERRUPT:
1003                 uurb->number_of_packets = 0;
1004                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
1005                                 != USB_ENDPOINT_XFER_INT)
1006                         return -EINVAL;
1007                 if (ps->dev->speed == USB_SPEED_HIGH)
1008                         interval = 1 << min (15, ep->desc.bInterval - 1);
1009                 else
1010                         interval = ep->desc.bInterval;
1011                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1012                         return -EINVAL;
1013                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
1014                         return -EFAULT;
1015                 snoop(&ps->dev->dev, "interrupt urb\n");
1016                 break;
1017
1018         default:
1019                 return -EINVAL;
1020         }
1021         if (!(as = alloc_async(uurb->number_of_packets))) {
1022                 kfree(isopkt);
1023                 kfree(dr);
1024                 return -ENOMEM;
1025         }
1026         if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
1027                 kfree(isopkt);
1028                 kfree(dr);
1029                 free_async(as);
1030                 return -ENOMEM;
1031         }
1032         as->urb->dev = ps->dev;
1033         as->urb->pipe = (uurb->type << 30) | __create_pipe(ps->dev, uurb->endpoint & 0xf) | (uurb->endpoint & USB_DIR_IN);
1034         as->urb->transfer_flags = uurb->flags;
1035         as->urb->transfer_buffer_length = uurb->buffer_length;
1036         as->urb->setup_packet = (unsigned char*)dr;
1037         as->urb->start_frame = uurb->start_frame;
1038         as->urb->number_of_packets = uurb->number_of_packets;
1039         as->urb->interval = interval;
1040         as->urb->context = as;
1041         as->urb->complete = async_completed;
1042         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1043                 as->urb->iso_frame_desc[u].offset = totlen;
1044                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1045                 totlen += isopkt[u].length;
1046         }
1047         kfree(isopkt);
1048         as->ps = ps;
1049         as->userurb = arg;
1050         if (uurb->endpoint & USB_DIR_IN)
1051                 as->userbuffer = uurb->buffer;
1052         else
1053                 as->userbuffer = NULL;
1054         as->signr = uurb->signr;
1055         as->ifnum = ifnum;
1056         as->pid = current->pid;
1057         as->uid = current->uid;
1058         as->euid = current->euid;
1059         security_task_getsecid(current, &as->secid);
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