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 /* Mutual exclusion for removal, open, and release */
  63 DEFINE_MUTEX(usbfs_mutex);
  64
  65 struct async {
  66         struct list_head asynclist;
  67         struct dev_state *ps;
  68         pid_t pid;
  69         uid_t uid, euid;
  70         unsigned int signr;
  71         unsigned int ifnum;
  72         void __user *userbuffer;
  73         void __user *userurb;
  74         struct urb *urb;
  75         u32 secid;
  76 };
  77
  78 static int usbfs_snoop = 0;
  79 module_param (usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  80 MODULE_PARM_DESC (usbfs_snoop, "true to log all usbfs traffic");
  81
  82 #define snoop(dev, format, arg...)                              \
  83         do {                                                    \
  84                 if (usbfs_snoop)                                \
  85                         dev_info( dev , format , ## arg);       \
  86         } while (0)
  87
  88 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
  89
  90
  91 #define MAX_USBFS_BUFFER_SIZE   16384
  92
  93 static inline int connected (struct dev_state *ps)
  94 {
  95         return (!list_empty(&ps->list) &&
  96                         ps->dev->state != USB_STATE_NOTATTACHED);
  97 }
  98
  99 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
 100 {
 101         loff_t ret;
 102
 103         lock_kernel();
 104
 105         switch (orig) {
 106         case 0:
 107                 file->f_pos = offset;
 108                 ret = file->f_pos;
 109                 break;
 110         case 1:
 111                 file->f_pos += offset;
 112                 ret = file->f_pos;
 113                 break;
 114         case 2:
 115         default:
 116                 ret = -EINVAL;
 117         }
 118
 119         unlock_kernel();
 120         return ret;
 121 }
 122
 123 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
 124 {
 125         struct dev_state *ps = file->private_data;
 126         struct usb_device *dev = ps->dev;
 127         ssize_t ret = 0;
 128         unsigned len;
 129         loff_t pos;
 130         int i;
 131
 132         pos = *ppos;
 133         usb_lock_device(dev);
 134         if (!connected(ps)) {
 135                 ret = -ENODEV;
 136                 goto err;
 137         } else if (pos < 0) {
 138                 ret = -EINVAL;
 139                 goto err;
 140         }
 141
 142         if (pos < sizeof(struct usb_device_descriptor)) {
 143                 struct usb_device_descriptor temp_desc ; /* 18 bytes - fits on the stack */
 144
 145                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 146                 le16_to_cpus(&temp_desc.bcdUSB);
 147                 le16_to_cpus(&temp_desc.idVendor);
 148                 le16_to_cpus(&temp_desc.idProduct);
 149                 le16_to_cpus(&temp_desc.bcdDevice);
 150
 151                 len = sizeof(struct usb_device_descriptor) - pos;
 152                 if (len > nbytes)
 153                         len = nbytes;
 154                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 155                         ret = -EFAULT;
 156                         goto err;
 157                 }
 158
 159                 *ppos += len;
 160                 buf += len;
 161                 nbytes -= len;
 162                 ret += len;
 163         }
 164
 165         pos = sizeof(struct usb_device_descriptor);
 166         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 167                 struct usb_config_descriptor *config =
 168                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 169                 unsigned int length = le16_to_cpu(config->wTotalLength);
 170
 171                 if (*ppos < pos + length) {
 172
 173                         /* The descriptor may claim to be longer than it
 174                          * really is.  Here is the actual allocated length. */
 175                         unsigned alloclen =
 176                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 177
 178                         len = length - (*ppos - pos);
 179                         if (len > nbytes)
 180                                 len = nbytes;
 181
 182                         /* Simply don't write (skip over) unallocated parts */
 183                         if (alloclen > (*ppos - pos)) {
 184                                 alloclen -= (*ppos - pos);
 185                                 if (copy_to_user(buf,
 186                                     dev->rawdescriptors[i] + (*ppos - pos),
 187                                     min(len, alloclen))) {
 188                                         ret = -EFAULT;
 189                                         goto err;
 190                                 }
 191                         }
 192
 193                         *ppos += len;
 194                         buf += len;
 195                         nbytes -= len;
 196                         ret += len;
 197                 }
 198
 199                 pos += length;
 200         }
 201
 202 err:
 203         usb_unlock_device(dev);
 204         return ret;
 205 }
 206
 207 /*
 208  * async list handling
 209  */
 210
 211 static struct async *alloc_async(unsigned int numisoframes)
 212 {
 213         unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor);
 214         struct async *as = kzalloc(assize, GFP_KERNEL);
 215
 216         if (!as)
 217                 return NULL;
 218         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 219         if (!as->urb) {
 220                 kfree(as);
 221                 return NULL;
 222         }
 223         return as;
 224 }
 225
 226 static void free_async(struct async *as)
 227 {
 228         kfree(as->urb->transfer_buffer);
 229         kfree(as->urb->setup_packet);
 230         usb_free_urb(as->urb);
 231         kfree(as);
 232 }
 233
 234 static inline void async_newpending(struct async *as)
 235 {
 236         struct dev_state *ps = as->ps;
 237         unsigned long flags;
 238
 239         spin_lock_irqsave(&ps->lock, flags);
 240         list_add_tail(&as->asynclist, &ps->async_pending);
 241         spin_unlock_irqrestore(&ps->lock, flags);
 242 }
 243
 244 static inline void async_removepending(struct async *as)
 245 {
 246         struct dev_state *ps = as->ps;
 247         unsigned long flags;
 248
 249         spin_lock_irqsave(&ps->lock, flags);
 250         list_del_init(&as->asynclist);
 251         spin_unlock_irqrestore(&ps->lock, flags);
 252 }
 253
 254 static inline struct async *async_getcompleted(struct dev_state *ps)
 255 {
 256         unsigned long flags;
 257         struct async *as = NULL;
 258
 259         spin_lock_irqsave(&ps->lock, flags);
 260         if (!list_empty(&ps->async_completed)) {
 261                 as = list_entry(ps->async_completed.next, struct async, asynclist);
 262                 list_del_init(&as->asynclist);
 263         }
 264         spin_unlock_irqrestore(&ps->lock, flags);
 265         return as;
 266 }
 267
 268 static inline struct async *async_getpending(struct dev_state *ps, void __user *userurb)
 269 {
 270         unsigned long flags;
 271         struct async *as;
 272
 273         spin_lock_irqsave(&ps->lock, flags);
 274         list_for_each_entry(as, &ps->async_pending, asynclist)
 275                 if (as->userurb == userurb) {
 276                         list_del_init(&as->asynclist);
 277                         spin_unlock_irqrestore(&ps->lock, flags);
 278                         return as;
 279                 }
 280         spin_unlock_irqrestore(&ps->lock, flags);
 281         return NULL;
 282 }
 283
 284 static void snoop_urb(struct urb *urb, void __user *userurb)
 285 {
 286         int j;
 287         unsigned char *data = urb->transfer_buffer;
 288
 289         if (!usbfs_snoop)
 290                 return;
 291
 292         if (urb->pipe & USB_DIR_IN)
 293                 dev_info(&urb->dev->dev, "direction=IN\n");
 294         else
 295                 dev_info(&urb->dev->dev, "direction=OUT\n");
 296         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
 297         dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
 298                  urb->transfer_buffer_length);
 299         dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
 300         dev_info(&urb->dev->dev, "data: ");
 301         for (j = 0; j < urb->transfer_buffer_length; ++j)
 302                 printk ("%02x ", data[j]);
 303         printk("\n");
 304 }
 305
 306 static void async_completed(struct urb *urb, struct pt_regs *regs)
 307 {
 308         struct async *as = urb->context;
 309         struct dev_state *ps = as->ps;
 310         struct siginfo sinfo;
 311
 312         spin_lock(&ps->lock);
 313         list_move_tail(&as->asynclist, &ps->async_completed);
 314         spin_unlock(&ps->lock);
 315         if (as->signr) {
 316                 sinfo.si_signo = as->signr;
 317                 sinfo.si_errno = as->urb->status;
 318                 sinfo.si_code = SI_ASYNCIO;
 319                 sinfo.si_addr = as->userurb;
 320                 kill_proc_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
 321                                       as->euid, as->secid);
 322         }
 323         snoop(&urb->dev->dev, "urb complete\n");
 324         snoop_urb(urb, as->userurb);
 325         wake_up(&ps->wait);
 326 }
 327
 328 static void destroy_async (struct dev_state *ps, struct list_head *list)
 329 {
 330         struct async *as;
 331         unsigned long flags;
 332
 333         spin_lock_irqsave(&ps->lock, flags);
 334         while (!list_empty(list)) {
 335                 as = list_entry(list->next, struct async, asynclist);
 336                 list_del_init(&as->asynclist);
 337
 338                 /* drop the spinlock so the completion handler can run */
 339                 spin_unlock_irqrestore(&ps->lock, flags);
 340                 usb_kill_urb(as->urb);
 341                 spin_lock_irqsave(&ps->lock, flags);
 342         }
 343         spin_unlock_irqrestore(&ps->lock, flags);
 344         as = async_getcompleted(ps);
 345         while (as) {
 346                 free_async(as);
 347                 as = async_getcompleted(ps);
 348         }
 349 }
 350
 351 static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum)
 352 {
 353         struct list_head *p, *q, hitlist;
 354         unsigned long flags;
 355
 356         INIT_LIST_HEAD(&hitlist);
 357         spin_lock_irqsave(&ps->lock, flags);
 358         list_for_each_safe(p, q, &ps->async_pending)
 359                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 360                         list_move_tail(p, &hitlist);
 361         spin_unlock_irqrestore(&ps->lock, flags);
 362         destroy_async(ps, &hitlist);
 363 }
 364
 365 static inline void destroy_all_async(struct dev_state *ps)
 366 {
 367                 destroy_async(ps, &ps->async_pending);
 368 }
 369
 370 /*
 371  * interface claims are made only at the request of user level code,
 372  * which can also release them (explicitly or by closing files).
 373  * they're also undone when devices disconnect.
 374  */
 375
 376 static int driver_probe (struct usb_interface *intf,
 377                          const struct usb_device_id *id)
 378 {
 379         return -ENODEV;
 380 }
 381
 382 static void driver_disconnect(struct usb_interface *intf)
 383 {
 384         struct dev_state *ps = usb_get_intfdata (intf);
 385         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 386
 387         if (!ps)
 388                 return;
 389
 390         /* NOTE:  this relies on usbcore having canceled and completed
 391          * all pending I/O requests; 2.6 does that.
 392          */
 393
 394         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 395                 clear_bit(ifnum, &ps->ifclaimed);
 396         else
 397                 warn("interface number %u out of range", ifnum);
 398
 399         usb_set_intfdata (intf, NULL);
 400
 401         /* force async requests to complete */
 402         destroy_async_on_interface(ps, ifnum);
 403 }
 404
 405 struct usb_driver usbfs_driver = {
 406         .name =         "usbfs",
 407         .probe =        driver_probe,
 408         .disconnect =   driver_disconnect,
 409 };
 410
 411 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 412 {
 413         struct usb_device *dev = ps->dev;
 414         struct usb_interface *intf;
 415         int err;
 416
 417         if (ifnum >= 8*sizeof(ps->ifclaimed))
 418                 return -EINVAL;
 419         /* already claimed */
 420         if (test_bit(ifnum, &ps->ifclaimed))
 421                 return 0;
 422
 423         /* lock against other changes to driver bindings */
 424         down_write(&usb_bus_type.subsys.rwsem);
 425         intf = usb_ifnum_to_if(dev, ifnum);
 426         if (!intf)
 427                 err = -ENOENT;
 428         else
 429                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 430         up_write(&usb_bus_type.subsys.rwsem);
 431         if (err == 0)
 432                 set_bit(ifnum, &ps->ifclaimed);
 433         return err;
 434 }
 435
 436 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 437 {
 438         struct usb_device *dev;
 439         struct usb_interface *intf;
 440         int err;
 441
 442         err = -EINVAL;
 443         if (ifnum >= 8*sizeof(ps->ifclaimed))
 444                 return err;
 445         dev = ps->dev;
 446         /* lock against other changes to driver bindings */
 447         down_write(&usb_bus_type.subsys.rwsem);
 448         intf = usb_ifnum_to_if(dev, ifnum);
 449         if (!intf)
 450                 err = -ENOENT;
 451         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 452                 usb_driver_release_interface(&usbfs_driver, intf);
 453                 err = 0;
 454         }
 455         up_write(&usb_bus_type.subsys.rwsem);
 456         return err;
 457 }
 458
 459 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 460 {
 461         if (ps->dev->state != USB_STATE_CONFIGURED)
 462                 return -EHOSTUNREACH;
 463         if (ifnum >= 8*sizeof(ps->ifclaimed))
 464                 return -EINVAL;
 465         if (test_bit(ifnum, &ps->ifclaimed))
 466                 return 0;
 467         /* if not yet claimed, claim it for the driver */
 468         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n",
 469                current->pid, current->comm, ifnum);
 470         return claimintf(ps, ifnum);
 471 }
 472
 473 static int findintfep(struct usb_device *dev, unsigned int ep)
 474 {
 475         unsigned int i, j, e;
 476         struct usb_interface *intf;
 477         struct usb_host_interface *alts;
 478         struct usb_endpoint_descriptor *endpt;
 479
 480         if (ep & ~(USB_DIR_IN|0xf))
 481                 return -EINVAL;
 482         if (!dev->actconfig)
 483                 return -ESRCH;
 484         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 485                 intf = dev->actconfig->interface[i];
 486                 for (j = 0; j < intf->num_altsetting; j++) {
 487                         alts = &intf->altsetting[j];
 488                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 489                                 endpt = &alts->endpoint[e].desc;
 490                                 if (endpt->bEndpointAddress == ep)
 491                                         return alts->desc.bInterfaceNumber;
 492                         }
 493                 }
 494         }
 495         return -ENOENT;
 496 }
 497
 498 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
 499 {
 500         int ret = 0;
 501
 502         if (ps->dev->state != USB_STATE_ADDRESS
 503          && ps->dev->state != USB_STATE_CONFIGURED)
 504                 return -EHOSTUNREACH;
 505         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 506                 return 0;
 507
 508         index &= 0xff;
 509         switch (requesttype & USB_RECIP_MASK) {
 510         case USB_RECIP_ENDPOINT:
 511                 if ((ret = findintfep(ps->dev, index)) >= 0)
 512                         ret = checkintf(ps, ret);
 513                 break;
 514
 515         case USB_RECIP_INTERFACE:
 516                 ret = checkintf(ps, index);
 517                 break;
 518         }
 519         return ret;
 520 }
 521
 522 static struct usb_device *usbdev_lookup_minor(int minor)
 523 {
 524         struct class_device *class_dev;
 525         struct usb_device *dev = NULL;
 526
 527         down(&usb_device_class->sem);
 528         list_for_each_entry(class_dev, &usb_device_class->children, node) {
 529                 if (class_dev->devt == MKDEV(USB_DEVICE_MAJOR, minor)) {
 530                         dev = class_dev->class_data;
 531                         break;
 532                 }
 533         }
 534         up(&usb_device_class->sem);
 535
 536         return dev;
 537 };
 538
 539 /*
 540  * file operations
 541  */
 542 static int usbdev_open(struct inode *inode, struct file *file)
 543 {
 544         struct usb_device *dev = NULL;
 545         struct dev_state *ps;
 546         int ret;
 547
 548         /* Protect against simultaneous removal or release */
 549         mutex_lock(&usbfs_mutex);
 550
 551         ret = -ENOMEM;
 552         if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
 553                 goto out;
 554
 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->i_private;
 561         if (!dev)
 562                 goto out;
 563         ret = usb_autoresume_device(dev, 1);
 564         if (ret)
 565                 goto out;
 566
 567         usb_get_dev(dev);
 568         ret = 0;
 569         ps->dev = dev;
 570         ps->file = file;
 571         spin_lock_init(&ps->lock);
 572         INIT_LIST_HEAD(&ps->async_pending);
 573         INIT_LIST_HEAD(&ps->async_completed);
 574         init_waitqueue_head(&ps->wait);
 575         ps->discsignr = 0;
 576         ps->disc_pid = current->pid;
 577         ps->disc_uid = current->uid;
 578         ps->disc_euid = current->euid;
 579         ps->disccontext = NULL;
 580         ps->ifclaimed = 0;
 581         security_task_getsecid(current, &ps->secid);
 582         wmb();
 583         list_add_tail(&ps->list, &dev->filelist);
 584         file->private_data = ps;
 585  out:
 586         if (ret)
 587                 kfree(ps);
 588         mutex_unlock(&usbfs_mutex);
 589         return ret;
 590 }
 591
 592 static int usbdev_release(struct inode *inode, struct file *file)
 593 {
 594         struct dev_state *ps = file->private_data;
 595         struct usb_device *dev = ps->dev;
 596         unsigned int ifnum;
 597
 598         usb_lock_device(dev);
 599
 600         /* Protect against simultaneous open */
 601         mutex_lock(&usbfs_mutex);
 602         list_del_init(&ps->list);
 603         mutex_unlock(&usbfs_mutex);
 604
 605         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 606                         ifnum++) {
 607                 if (test_bit(ifnum, &ps->ifclaimed))
 608                         releaseintf(ps, ifnum);
 609         }
 610         destroy_all_async(ps);
 611         usb_autosuspend_device(dev, 1);
 612         usb_unlock_device(dev);
 613         usb_put_dev(dev);
 614         kfree(ps);
 615         return 0;
 616 }
 617
 618 static int proc_control(struct dev_state *ps, void __user *arg)
 619 {
 620         struct usb_device *dev = ps->dev;
 621         struct usbdevfs_ctrltransfer ctrl;
 622         unsigned int tmo;
 623         unsigned char *tbuf;
 624         int i, j, ret;
 625
 626         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 627                 return -EFAULT;
 628         if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
 629                 return ret;
 630         if (ctrl.wLength > PAGE_SIZE)
 631                 return -EINVAL;
 632         if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
 633                 return -ENOMEM;
 634         tmo = ctrl.timeout;
 635         if (ctrl.bRequestType & 0x80) {
 636                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
 637                         free_page((unsigned long)tbuf);
 638                         return -EINVAL;
 639                 }
 640                 snoop(&dev->dev, "control read: bRequest=%02x "
 641                                 "bRrequestType=%02x wValue=%04x "
 642                                 "wIndex=%04x wLength=%04x\n",
 643                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 644                                 ctrl.wIndex, ctrl.wLength);
 645
 646                 usb_unlock_device(dev);
 647                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 648                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 649                 usb_lock_device(dev);
 650                 if ((i > 0) && ctrl.wLength) {
 651                         if (usbfs_snoop) {
 652                                 dev_info(&dev->dev, "control read: data ");
 653                                 for (j = 0; j < i; ++j)
 654                                         printk("%02x ", (unsigned char)(tbuf)[j]);
 655                                 printk("\n");
 656                         }
 657                         if (copy_to_user(ctrl.data, tbuf, i)) {
 658                                 free_page((unsigned long)tbuf);
 659                                 return -EFAULT;
 660                         }
 661                 }
 662         } else {
 663                 if (ctrl.wLength) {
 664                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 665                                 free_page((unsigned long)tbuf);
 666                                 return -EFAULT;
 667                         }
 668                 }
 669                 snoop(&dev->dev, "control write: bRequest=%02x "
 670                                 "bRrequestType=%02x wValue=%04x "
 671                                 "wIndex=%04x wLength=%04x\n",
 672                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 673                                 ctrl.wIndex, ctrl.wLength);
 674                 if (usbfs_snoop) {
 675                         dev_info(&dev->dev, "control write: data: ");
 676                         for (j = 0; j < ctrl.wLength; ++j)
 677                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 678                         printk("\n");
 679                 }
 680                 usb_unlock_device(dev);
 681                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 682                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 683                 usb_lock_device(dev);
 684         }
 685         free_page((unsigned long)tbuf);
 686         if (i<0 && i != -EPIPE) {
 687                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 688                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 689                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 690                            ctrl.wLength, i);
 691         }
 692         return i;
 693 }
 694
 695 static int proc_bulk(struct dev_state *ps, void __user *arg)
 696 {
 697         struct usb_device *dev = ps->dev;
 698         struct usbdevfs_bulktransfer bulk;
 699         unsigned int tmo, len1, pipe;
 700         int len2;
 701         unsigned char *tbuf;
 702         int i, j, ret;
 703
 704         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 705                 return -EFAULT;
 706         if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
 707                 return ret;
 708         if ((ret = checkintf(ps, ret)))
 709                 return ret;
 710         if (bulk.ep & USB_DIR_IN)
 711                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 712         else
 713                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 714         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 715                 return -EINVAL;
 716         len1 = bulk.len;
 717         if (len1 > MAX_USBFS_BUFFER_SIZE)
 718                 return -EINVAL;
 719         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 720                 return -ENOMEM;
 721         tmo = bulk.timeout;
 722         if (bulk.ep & 0x80) {
 723                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 724                         kfree(tbuf);
 725                         return -EINVAL;
 726                 }
 727                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
 728                         bulk.len, bulk.timeout);
 729                 usb_unlock_device(dev);
 730                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 731                 usb_lock_device(dev);
 732                 if (!i && len2) {
 733                         if (usbfs_snoop) {
 734                                 dev_info(&dev->dev, "bulk read: data ");
 735                                 for (j = 0; j < len2; ++j)
 736                                         printk("%02x ", (unsigned char)(tbuf)[j]);
 737                                 printk("\n");
 738                         }
 739                         if (copy_to_user(bulk.data, tbuf, len2)) {
 740                                 kfree(tbuf);
 741                                 return -EFAULT;
 742                         }
 743                 }
 744         } else {
 745                 if (len1) {
 746                         if (copy_from_user(tbuf, bulk.data, len1)) {
 747                                 kfree(tbuf);
 748                                 return -EFAULT;
 749                         }
 750                 }
 751                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
 752                         bulk.len, bulk.timeout);
 753                 if (usbfs_snoop) {
 754                         dev_info(&dev->dev, "bulk write: data: ");
 755                         for (j = 0; j < len1; ++j)
 756                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 757                         printk("\n");
 758                 }
 759                 usb_unlock_device(dev);
 760                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 761                 usb_lock_device(dev);
 762         }
 763         kfree(tbuf);
 764         if (i < 0)
 765                 return i;
 766         return len2;
 767 }
 768
 769 static int proc_resetep(struct dev_state *ps, void __user *arg)
 770 {
 771         unsigned int ep;
 772         int ret;
 773
 774         if (get_user(ep, (unsigned int __user *)arg))
 775                 return -EFAULT;
 776         if ((ret = findintfep(ps->dev, ep)) < 0)
 777                 return ret;
 778         if ((ret = checkintf(ps, ret)))
 779                 return ret;
 780         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
 781         return 0;
 782 }
 783
 784 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 785 {
 786         unsigned int ep;
 787         int pipe;
 788         int ret;
 789
 790         if (get_user(ep, (unsigned int __user *)arg))
 791                 return -EFAULT;
 792         if ((ret = findintfep(ps->dev, ep)) < 0)
 793                 return ret;
 794         if ((ret = checkintf(ps, ret)))
 795                 return ret;
 796         if (ep & USB_DIR_IN)
 797                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 798         else
 799                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 800
 801         return usb_clear_halt(ps->dev, pipe);
 802 }
 803
 804
 805 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 806 {
 807         struct usbdevfs_getdriver gd;
 808         struct usb_interface *intf;
 809         int ret;
 810
 811         if (copy_from_user(&gd, arg, sizeof(gd)))
 812                 return -EFAULT;
 813         down_read(&usb_bus_type.subsys.rwsem);
 814         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 815         if (!intf || !intf->dev.driver)
 816                 ret = -ENODATA;
 817         else {
 818                 strncpy(gd.driver, intf->dev.driver->name,
 819                                 sizeof(gd.driver));
 820                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 821         }
 822         up_read(&usb_bus_type.subsys.rwsem);
 823         return ret;
 824 }
 825
 826 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 827 {
 828         struct usbdevfs_connectinfo ci;
 829
 830         ci.devnum = ps->dev->devnum;
 831         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 832         if (copy_to_user(arg, &ci, sizeof(ci)))
 833                 return -EFAULT;
 834         return 0;
 835 }
 836
 837 static int proc_resetdevice(struct dev_state *ps)
 838 {
 839         return usb_reset_composite_device(ps->dev, NULL);
 840 }
 841
 842 static int proc_setintf(struct dev_state *ps, void __user *arg)
 843 {
 844         struct usbdevfs_setinterface setintf;
 845         int ret;
 846
 847         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 848                 return -EFAULT;
 849         if ((ret = checkintf(ps, setintf.interface)))
 850                 return ret;
 851         return usb_set_interface(ps->dev, setintf.interface,
 852                         setintf.altsetting);
 853 }
 854
 855 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 856 {
 857         unsigned int u;
 858         int status = 0;
 859         struct usb_host_config *actconfig;
 860
 861         if (get_user(u, (unsigned int __user *)arg))
 862                 return -EFAULT;
 863
 864         actconfig = ps->dev->actconfig;
 865
 866         /* Don't touch the device if any interfaces are claimed.
 867          * It could interfere with other drivers' operations, and if
 868          * an interface is claimed by usbfs it could easily deadlock.
 869          */
 870         if (actconfig) {
 871                 int i;
 872
 873                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 874                         if (usb_interface_claimed(actconfig->interface[i])) {
 875                                 dev_warn (&ps->dev->dev,
 876                                         "usbfs: interface %d claimed by %s "
 877                                         "while '%s' sets config #%d\n",
 878                                         actconfig->interface[i]
 879                                                 ->cur_altsetting
 880                                                 ->desc.bInterfaceNumber,
 881                                         actconfig->interface[i]
 882                                                 ->dev.driver->name,
 883                                         current->comm, u);
 884                                 status = -EBUSY;
 885                                 break;
 886                         }
 887                 }
 888         }
 889
 890         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 891          * so avoid usb_set_configuration()'s kick to sysfs
 892          */
 893         if (status == 0) {
 894                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 895                         status = usb_reset_configuration(ps->dev);
 896                 else
 897                         status = usb_set_configuration(ps->dev, u);
 898         }
 899
 900         return status;
 901 }
 902
 903 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 904                              struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
 905                              void __user *arg)
 906 {
 907         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 908         struct usb_host_endpoint *ep;
 909         struct async *as;
 910         struct usb_ctrlrequest *dr = NULL;
 911         unsigned int u, totlen, isofrmlen;
 912         int ret, interval = 0, ifnum = -1;
 913
 914         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
 915                            URB_NO_FSBR|URB_ZERO_PACKET))
 916                 return -EINVAL;
 917         if (!uurb->buffer)
 918                 return -EINVAL;
 919         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
 920                 return -EINVAL;
 921         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
 922                 if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
 923                         return ifnum;
 924                 if ((ret = checkintf(ps, ifnum)))
 925                         return ret;
 926         }
 927         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0)
 928                 ep = ps->dev->ep_in [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 929         else
 930                 ep = ps->dev->ep_out [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 931         if (!ep)
 932                 return -ENOENT;
 933         switch(uurb->type) {
 934         case USBDEVFS_URB_TYPE_CONTROL:
 935                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 936                                 != USB_ENDPOINT_XFER_CONTROL)
 937                         return -EINVAL;
 938                 /* min 8 byte setup packet, max 8 byte setup plus an arbitrary data stage */
 939                 if (uurb->buffer_length < 8 || uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
 940                         return -EINVAL;
 941                 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
 942                         return -ENOMEM;
 943                 if (copy_from_user(dr, uurb->buffer, 8)) {
 944                         kfree(dr);
 945                         return -EFAULT;
 946                 }
 947                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
 948                         kfree(dr);
 949                         return -EINVAL;
 950                 }
 951                 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
 952                         kfree(dr);
 953                         return ret;
 954                 }
 955                 uurb->endpoint = (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK);
 956                 uurb->number_of_packets = 0;
 957                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
 958                 uurb->buffer += 8;
 959                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ?  VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) {
 960                         kfree(dr);
 961                         return -EFAULT;
 962                 }
 963                 snoop(&ps->dev->dev, "control urb\n");
 964                 break;
 965
 966         case USBDEVFS_URB_TYPE_BULK:
 967                 switch (ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 968                 case USB_ENDPOINT_XFER_CONTROL:
 969                 case USB_ENDPOINT_XFER_ISOC:
 970                         return -EINVAL;
 971                 /* allow single-shot interrupt transfers, at bogus rates */
 972                 }
 973                 uurb->number_of_packets = 0;
 974                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
 975                         return -EINVAL;
 976                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
 977                         return -EFAULT;
 978                 snoop(&ps->dev->dev, "bulk urb\n");
 979                 break;
 980
 981         case USBDEVFS_URB_TYPE_ISO:
 982                 /* arbitrary limit */
 983                 if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
 984                         return -EINVAL;
 985                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 986                                 != USB_ENDPOINT_XFER_ISOC)
 987                         return -EINVAL;
 988                 interval = 1 << min (15, ep->desc.bInterval - 1);
 989                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
 990                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
 991                         return -ENOMEM;
 992                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
 993                         kfree(isopkt);
 994                         return -EFAULT;
 995                 }
 996                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
 997                         /* arbitrary limit, sufficient for USB 2.0 high-bandwidth iso */
 998                         if (isopkt[u].length > 8192) {
 999                                 kfree(isopkt);
1000                                 return -EINVAL;
1001                         }
1002                         totlen += isopkt[u].length;
1003                 }
1004                 if (totlen > 32768) {
1005                         kfree(isopkt);
1006                         return -EINVAL;
1007                 }
1008                 uurb->buffer_length = totlen;
1009                 snoop(&ps->dev->dev, "iso urb\n");
1010                 break;
1011
1012         case USBDEVFS_URB_TYPE_INTERRUPT:
1013                 uurb->number_of_packets = 0;
1014                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
1015                                 != USB_ENDPOINT_XFER_INT)
1016                         return -EINVAL;
1017                 if (ps->dev->speed == USB_SPEED_HIGH)
1018                         interval = 1 << min (15, ep->desc.bInterval - 1);
1019                 else
1020                         interval = ep->desc.bInterval;
1021                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1022                         return -EINVAL;
1023                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
1024                         return -EFAULT;
1025                 snoop(&ps->dev->dev, "interrupt urb\n");
1026                 break;
1027
1028         default:
1029                 return -EINVAL;
1030         }
1031         if (!(as = alloc_async(uurb->number_of_packets))) {
1032                 kfree(isopkt);
1033                 kfree(dr);
1034                 return -ENOMEM;
1035         }
1036         if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
1037                 kfree(isopkt);
1038                 kfree(dr);
1039                 free_async(as);
1040                 return -ENOMEM;
1041         }
1042         as->urb->dev = ps->dev;
1043         as->urb->pipe = (uurb->type << 30) | __create_pipe(ps->dev, uurb->endpoint & 0xf) | (uurb->endpoint & USB_DIR_IN);
1044         as->urb->transfer_flags = uurb->flags;
1045         as->urb->transfer_buffer_length = uurb->buffer_length;
1046         as->urb->setup_packet = (unsigned char*)dr;
1047         as->urb->start_frame = uurb->start_frame;
1048         as->urb->number_of_packets = uurb->number_of_packets;
1049         as->urb->interval = interval;
1050         as->urb->context = as;
1051         as->urb->complete = async_completed;
1052         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1053                 as->urb->iso_frame_desc[u].offset = totlen;
1054                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1055                 totlen += isopkt[u].length;
1056         }
1057         kfree(isopkt);
1058         as->ps = ps;
1059         as->userurb = arg;
1060         if (uurb->endpoint & USB_DIR_IN)
1061                 as->userbuffer = uurb->buffer;
1062         else
1063                 as->userbuffer = NULL;
1064         as->signr = uurb->signr;
1065         as->ifnum = ifnum;
1066         as->pid = current->pid;
1067         as->uid = current->uid;
1068         as->euid = current->euid;
1069         security_task_getsecid(current, &as->secid);
1070         if (!(uurb->endpoint & USB_DIR_IN)) {
1071                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, as->urb->transfer_buffer_length)) {
1072                         free_async(as);
1073                         return -EFAULT;
1074                 }
1075         }
1076         snoop(&as->urb->dev->dev, "submit urb\n");
1077         snoop_urb(as->urb, as->userurb);
1078         async_newpending(as);
1079         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1080                 dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
1081                 async_removepending(as);
1082                 free_async(as);
1083                 return ret;
1084         }
1085         return 0;
1086 }
1087
1088 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1089 {
1090         struct usbdevfs_urb uurb;
1091
1092         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1093                 return -EFAULT;
1094
1095         return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg);
1096 }
1097
1098 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1099 {
1100         struct async *as;
1101
1102         as = async_getpending(ps, arg);
1103         if (!as)
1104                 return -EINVAL;
1105         usb_kill_urb(as->urb);
1106         return 0;
1107 }
1108
1109 static int processcompl(struct async *as, void __user * __user *arg)
1110 {
1111         struct urb *urb = as->urb;
1112         struct usbdevfs_urb __user *userurb = as->userurb;
1113         void __user *addr = as->userurb;
1114         unsigned int i;
1115
1116         if (as->userbuffer)
1117                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1118                         return -EFAULT;
1119         if (put_user(urb->status, &userurb->status))
1120                 return -EFAULT;
1121         if (put_user(urb->actual_length, &userurb->actual_length))
1122                 return -EFAULT;
1123         if (put_user(urb->error_count, &userurb->error_count))
1124                 return -EFAULT;
1125
1126         if (usb_pipeisoc(urb->pipe)) {
1127                 for (i = 0; i < urb->number_of_packets; i++) {
1128                         if (put_user(urb->iso_frame_desc[i].actual_length,
1129                                      &userurb->iso_frame_desc[i].actual_length))
1130                                 return -EFAULT;
1131                         if (put_user(urb->iso_frame_desc[i].status,
1132                                      &userurb->iso_frame_desc[i].status))
1133                                 return -EFAULT;
1134                 }
1135         }
1136
1137         free_async(as);
1138
1139         if (put_user(addr, (void __user * __user *)arg))
1140                 return -EFAULT;
1141         return 0;
1142 }
1143
1144 static struct async* reap_as(struct dev_state *ps)
1145 {
1146         DECLARE_WAITQUEUE(wait, current);
1147         struct async *as = NULL;
1148         struct usb_device *dev = ps->dev;
1149
1150         add_wait_queue(&ps->wait, &wait);
1151         for (;;) {
1152                 __set_current_state(TASK_INTERRUPTIBLE);
1153                 if ((as = async_getcompleted(ps)))
1154                         break;
1155                 if (signal_pending(current))
1156                         break;
1157                 usb_unlock_device(dev);
1158                 schedule();
1159                 usb_lock_device(dev);
1160         }
1161         remove_wait_queue(&ps->wait, &wait);
1162         set_current_state(TASK_RUNNING);
1163         return as;
1164 }
1165
1166 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1167 {
1168         struct async *as = reap_as(ps);
1169         if (as)
1170                 return processcompl(as, (void __user * __user *)arg);
1171         if (signal_pending(current))
1172                 return -EINTR;
1173         return -EIO;
1174 }
1175
1176 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1177 {
1178         struct async *as;
1179
1180         if (!(as = async_getcompleted(ps)))
1181                 return -EAGAIN;
1182         return processcompl(as, (void __user * __user *)arg);
1183 }
1184
1185 #ifdef CONFIG_COMPAT
1186
1187 static int get_urb32(struct usbdevfs_urb *kurb,
1188                      struct usbdevfs_urb32 __user *uurb)
1189 {
1190         __u32  uptr;
1191         if (get_user(kurb->type, &uurb->type) ||
1192             __get_user(kurb->endpoint, &uurb->endpoint) ||
1193             __get_user(kurb->status, &uurb->status) ||
1194             __get_user(kurb->flags, &uurb->flags) ||
1195             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1196             __get_user(kurb->actual_length, &uurb->actual_length) ||
1197             __get_user(kurb->start_frame, &uurb->start_frame) ||
1198             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1199             __get_user(kurb->error_count, &uurb->error_count) ||
1200             __get_user(kurb->signr, &uurb->signr))
1201                 return -EFAULT;
1202
1203         if (__get_user(uptr, &uurb->buffer))
1204                 return -EFAULT;
1205         kurb->buffer = compat_ptr(uptr);
1206         if (__get_user(uptr, &uurb->buffer))
1207                 return -EFAULT;
1208         kurb->usercontext = compat_ptr(uptr);
1209
1210         return 0;
1211 }
1212
1213 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1214 {
1215         struct usbdevfs_urb uurb;
1216
1217         if (get_urb32(&uurb,(struct usbdevfs_urb32 *)arg))
1218                 return -EFAULT;
1219
1220         return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg);
1221 }
1222
1223 static int processcompl_compat(struct async *as, void __user * __user *arg)
1224 {
1225         struct urb *urb = as->urb;
1226         struct usbdevfs_urb32 __user *userurb = as->userurb;
1227         void __user *addr = as->userurb;
1228         unsigned int i;
1229
1230         if (as->userbuffer)
1231                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1232                         return -EFAULT;
1233         if (put_user(urb->status, &userurb->status))
1234                 return -EFAULT;
1235         if (put_user(urb->actual_length, &userurb->actual_length))
1236                 return -EFAULT;
1237         if (put_user(urb->error_count, &userurb->error_count))
1238                 return -EFAULT;
1239
1240         if (usb_pipeisoc(urb->pipe)) {
1241                 for (i = 0; i < urb->number_of_packets; i++) {
1242                         if (put_user(urb->iso_frame_desc[i].actual_length,
1243                                      &userurb->iso_frame_desc[i].actual_length))
1244                                 return -EFAULT;
1245                         if (put_user(urb->iso_frame_desc[i].status,
1246                                      &userurb->iso_frame_desc[i].status))
1247                                 return -EFAULT;
1248                 }
1249         }
1250
1251         free_async(as);
1252         if (put_user((u32)(u64)addr, (u32 __user *)arg))
1253                 return -EFAULT;
1254         return 0;
1255 }
1256
1257 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1258 {
1259         struct async *as = reap_as(ps);
1260         if (as)
1261                 return processcompl_compat(as, (void __user * __user *)arg);
1262         if (signal_pending(current))
1263                 return -EINTR;
1264         return -EIO;
1265 }
1266
1267 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1268 {
1269         struct async *as;
1270
1271         if (!(as = async_getcompleted(ps)))
1272                 return -EAGAIN;
1273         return processcompl_compat(as, (void __user * __user *)arg);
1274 }
1275
1276 #endif
1277
1278 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1279 {
1280         struct usbdevfs_disconnectsignal ds;
1281
1282         if (copy_from_user(&ds, arg, sizeof(ds)))
1283                 return -EFAULT;
1284         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1285                 return -EINVAL;
1286         ps->discsignr = ds.signr;
1287         ps->disccontext = ds.context;
1288         return 0;
1289 }
1290
1291 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1292 {
1293         unsigned int ifnum;
1294
1295         if (get_user(ifnum, (unsigned int __user *)arg))
1296                 return -EFAULT;
1297         return claimintf(ps, ifnum);
1298 }
1299
1300 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1301 {
1302         unsigned int ifnum;
1303         int ret;
1304
1305         if (get_user(ifnum, (unsigned int __user *)arg))
1306                 return -EFAULT;
1307         if ((ret = releaseintf(ps, ifnum)) < 0)
1308                 return ret;
1309         destroy_async_on_interface (ps, ifnum);
1310         return 0;
1311 }
1312
1313 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1314 {
1315         int                     size;
1316         void                    *buf = NULL;
1317         int                     retval = 0;
1318         struct usb_interface    *intf = NULL;
1319         struct usb_driver       *driver = NULL;
1320
1321         /* alloc buffer */
1322         if ((size = _IOC_SIZE (ctl->ioctl_code)) > 0) {
1323                 if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
1324                         return -ENOMEM;
1325                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1326                         if (copy_from_user (buf, ctl->data, size)) {
1327                                 kfree(buf);
1328                                 return -EFAULT;
1329                         }
1330                 } else {
1331                         memset (buf, 0, size);
1332                 }
1333         }
1334
1335         if (!connected(ps)) {
1336                 kfree(buf);
1337                 return -ENODEV;
1338         }
1339
1340         if (ps->dev->state != USB_STATE_CONFIGURED)
1341                 retval = -EHOSTUNREACH;
1342         else if (!(intf = usb_ifnum_to_if (ps->dev, ctl->ifno)))
1343                retval = -EINVAL;
1344         else switch (ctl->ioctl_code) {
1345
1346         /* disconnect kernel driver from interface */
1347         case USBDEVFS_DISCONNECT:
1348
1349                 down_write(&usb_bus_type.subsys.rwsem);
1350                 if (intf->dev.driver) {
1351                         driver = to_usb_driver(intf->dev.driver);
1352                         dev_dbg (&intf->dev, "disconnect by usbfs\n");
1353                         usb_driver_release_interface(driver, intf);
1354                 } else
1355                         retval = -ENODATA;
1356                 up_write(&usb_bus_type.subsys.rwsem);
1357                 break;
1358
1359         /* let kernel drivers try to (re)bind to the interface */
1360         case USBDEVFS_CONNECT:
1361                 usb_unlock_device(ps->dev);
1362                 retval = bus_rescan_devices(intf->dev.bus);
1363                 usb_lock_device(ps->dev);
1364                 break;
1365
1366         /* talk directly to the interface's driver */
1367         default:
1368                 down_read(&usb_bus_type.subsys.rwsem);
1369                 if (intf->dev.driver)
1370                         driver = to_usb_driver(intf->dev.driver);
1371                 if (driver == NULL || driver->ioctl == NULL) {
1372                         retval = -ENOTTY;
1373                 } else {
1374                         retval = driver->ioctl (intf, ctl->ioctl_code, buf);
1375                         if (retval == -ENOIOCTLCMD)
1376                                 retval = -ENOTTY;
1377                 }
1378                 up_read(&usb_bus_type.subsys.rwsem);
1379         }
1380
1381         /* cleanup and return */
1382         if (retval >= 0
1383                         && (_IOC_DIR (ctl->ioctl_code) & _IOC_READ) != 0
1384                         && size > 0
1385                         && copy_to_user (ctl->data, buf, size) != 0)
1386                 retval = -EFAULT;
1387
1388         kfree(buf);
1389         return retval;
1390 }
1391
1392 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1393 {
1394         struct usbdevfs_ioctl   ctrl;
1395
1396         if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
1397                 return -EFAULT;
1398         return proc_ioctl(ps, &ctrl);
1399 }
1400
1401 #ifdef CONFIG_COMPAT
1402 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1403 {
1404         struct usbdevfs_ioctl32 __user *uioc;
1405         struct usbdevfs_ioctl ctrl;
1406         u32 udata;
1407
1408         uioc = compat_ptr((long)arg);
1409         if (get_user(ctrl.ifno, &uioc->ifno) ||
1410             get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1411             __get_user(udata, &uioc->data))
1412                 return -EFAULT;
1413         ctrl.data = compat_ptr(udata);
1414
1415         return proc_ioctl(ps, &ctrl);
1416 }
1417 #endif
1418
1419 /*
1420  * NOTE:  All requests here that have interface numbers as parameters
1421  * are assuming that somehow the configuration has been prevented from
1422  * changing.  But there's no mechanism to ensure that...
1423  */
1424 static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1425 {
1426         struct dev_state *ps = file->private_data;
1427         struct usb_device *dev = ps->dev;
1428         void __user *p = (void __user *)arg;
1429         int ret = -ENOTTY;
1430
1431         if (!(file->f_mode & FMODE_WRITE))
1432                 return -EPERM;
1433         usb_lock_device(dev);
1434         if (!connected(ps)) {
1435                 usb_unlock_device(dev);
1436                 return -ENODEV;
1437         }
1438
1439         switch (cmd) {
1440         case USBDEVFS_CONTROL:
1441                 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
1442                 ret = proc_control(ps, p);
1443                 if (ret >= 0)
1444                         inode->i_mtime = CURRENT_TIME;
1445                 break;
1446
1447         case USBDEVFS_BULK:
1448                 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
1449                 ret = proc_bulk(ps, p);
1450                 if (ret >= 0)
1451                         inode->i_mtime = CURRENT_TIME;
1452                 break;
1453
1454         case USBDEVFS_RESETEP:
1455                 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
1456                 ret = proc_resetep(ps, p);
1457                 if (ret >= 0)
1458                         inode->i_mtime = CURRENT_TIME;
1459                 break;
1460
1461         case USBDEVFS_RESET:
1462                 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
1463                 ret = proc_resetdevice(ps);
1464                 break;
1465
1466         case USBDEVFS_CLEAR_HALT:
1467                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
1468                 ret = proc_clearhalt(ps, p);
1469                 if (ret >= 0)
1470                         inode->i_mtime = CURRENT_TIME;
1471                 break;
1472
1473         case USBDEVFS_GETDRIVER:
1474                 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
1475                 ret = proc_getdriver(ps, p);
1476                 break;
1477
1478         case USBDEVFS_CONNECTINFO:
1479                 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
1480                 ret = proc_connectinfo(ps, p);
1481                 break;
1482
1483         case USBDEVFS_SETINTERFACE:
1484                 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
1485                 ret = proc_setintf(ps, p);
1486                 break;
1487
1488         case USBDEVFS_SETCONFIGURATION:
1489                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
1490                 ret = proc_setconfig(ps, p);
1491                 break;
1492
1493         case USBDEVFS_SUBMITURB:
1494                 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
1495                 ret = proc_submiturb(ps, p);
1496                 if (ret >= 0)
1497                         inode->i_mtime = CURRENT_TIME;
1498                 break;
1499
1500 #ifdef CONFIG_COMPAT
1501
1502         case USBDEVFS_SUBMITURB32:
1503                 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
1504                 ret = proc_submiturb_compat(ps, p);
1505                 if (ret >= 0)
1506                         inode->i_mtime = CURRENT_TIME;
1507                 break;
1508
1509         case USBDEVFS_REAPURB32:
1510                 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
1511                 ret = proc_reapurb_compat(ps, p);
1512                 break;
1513
1514         case USBDEVFS_REAPURBNDELAY32:
1515                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
1516                 ret = proc_reapurbnonblock_compat(ps, p);
1517                 break;
1518
1519         case USBDEVFS_IOCTL32:
1520                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1521                 ret = proc_ioctl_compat(ps, (compat_uptr_t)(long)p);
1522                 break;
1523 #endif
1524
1525         case USBDEVFS_DISCARDURB:
1526                 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
1527                 ret = proc_unlinkurb(ps, p);
1528                 break;
1529
1530         case USBDEVFS_REAPURB:
1531                 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
1532                 ret = proc_reapurb(ps, p);
1533                 break;
1534
1535         case USBDEVFS_REAPURBNDELAY:
1536                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
1537                 ret = proc_reapurbnonblock(ps, p);
1538                 break;
1539
1540         case USBDEVFS_DISCSIGNAL:
1541                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
1542                 ret = proc_disconnectsignal(ps, p);
1543                 break;
1544
1545         case USBDEVFS_CLAIMINTERFACE:
1546                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
1547                 ret = proc_claiminterface(ps, p);
1548                 break;
1549
1550         case USBDEVFS_RELEASEINTERFACE:
1551                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
1552                 ret = proc_releaseinterface(ps, p);
1553                 break;
1554
1555         case USBDEVFS_IOCTL:
1556                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1557                 ret = proc_ioctl_default(ps, p);
1558                 break;
1559         }
1560         usb_unlock_device(dev);
1561         if (ret >= 0)
1562                 inode->i_atime = CURRENT_TIME;
1563         return ret;
1564 }
1565
1566 /* No kernel lock - fine */
1567 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
1568 {
1569         struct dev_state *ps = file->private_data;
1570         unsigned int mask = 0;
1571
1572         poll_wait(file, &ps->wait, wait);
1573         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1574                 mask |= POLLOUT | POLLWRNORM;
1575         if (!connected(ps))
1576                 mask |= POLLERR | POLLHUP;
1577         return mask;
1578 }
1579
1580 const struct file_operations usbfs_device_file_operations = {
1581         .llseek =       usbdev_lseek,
1582         .read =         usbdev_read,
1583         .poll =         usbdev_poll,
1584         .ioctl =        usbdev_ioctl,
1585         .open =         usbdev_open,
1586         .release =      usbdev_release,
1587 };
1588
1589 static void usbdev_add(struct usb_device *dev)
1590 {
1591         int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1592
1593         dev->class_dev = class_device_create(usb_device_class, NULL,
1594                                 MKDEV(USB_DEVICE_MAJOR, minor), &dev->dev,
1595                                 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1596
1597         dev->class_dev->class_data = dev;
1598 }
1599
1600 static void usbdev_remove(struct usb_device *dev)
1601 {
1602         class_device_unregister(dev->class_dev);
1603 }
1604
1605 static int usbdev_notify(struct notifier_block *self, unsigned long action,
1606                          void *dev)
1607 {
1608         switch (action) {
1609         case USB_DEVICE_ADD:
1610                 usbdev_add(dev);
1611                 break;
1612         case USB_DEVICE_REMOVE:
1613                 usbdev_remove(dev);
1614                 break;
1615         }
1616         return NOTIFY_OK;
1617 }
1618
1619 static struct notifier_block usbdev_nb = {
1620         .notifier_call =        usbdev_notify,
1621 };
1622
1623 static struct cdev usb_device_cdev = {
1624         .kobj   = {.name = "usb_device", },
1625         .owner  = THIS_MODULE,
1626 };
1627
1628 int __init usbdev_init(void)
1629 {
1630         int retval;
1631
1632         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1633                         "usb_device");
1634         if (retval) {
1635                 err("unable to register minors for usb_device");
1636                 goto out;
1637         }
1638         cdev_init(&usb_device_cdev, &usbfs_device_file_operations);
1639         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1640         if (retval) {
1641                 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1642                 goto error_cdev;
1643         }
1644         usb_device_class = class_create(THIS_MODULE, "usb_device");
1645         if (IS_ERR(usb_device_class)) {
1646                 err("unable to register usb_device class");
1647                 retval = PTR_ERR(usb_device_class);
1648                 goto error_class;
1649         }
1650
1651         usb_register_notify(&usbdev_nb);
1652
1653 out:
1654         return retval;
1655
1656 error_class:
1657         usb_device_class = NULL;
1658         cdev_del(&usb_device_cdev);
1659
1660 error_cdev:
1661         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1662         goto out;
1663 }
1664
1665 void usbdev_cleanup(void)
1666 {
1667         usb_unregister_notify(&usbdev_nb);
1668         class_destroy(usb_device_class);
1669         cdev_del(&usb_device_cdev);
1670         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1671 }
1672