SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/usb/core/devio.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *      devio.c  --  User space communication with USB devices.
   5  *
   6  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   7  *
   8  *      This program is free software; you can redistribute it and/or modify
   9  *      it under the terms of the GNU General Public License as published by
  10  *      the Free Software Foundation; either version 2 of the License, or
  11  *      (at your option) any later version.
  12  *
  13  *      This program is distributed in the hope that it will be useful,
  14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *      GNU General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License
  19  *      along with this program; if not, write to the Free Software
  20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  *  $Id: devio.c,v 1.7 2000/02/01 17:28:48 fliegl Exp $
  23  *
  24  *  This file implements the usbfs/x/y files, where
  25  *  x is the bus number and y the device number.
  26  *
  27  *  It allows user space programs/"drivers" to communicate directly
  28  *  with USB devices without intervening kernel driver.
  29  *
  30  *  Revision history
  31  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  32  *    04.01.2000   0.2   Turned into its own filesystem
  33  */
  34
  35 /*****************************************************************************/
  36
  37 #include <linux/fs.h>
  38 #include <linux/mm.h>
  39 #include <linux/slab.h>
  40 #include <linux/smp_lock.h>
  41 #include <linux/signal.h>
  42 #include <linux/poll.h>
  43 #include <linux/module.h>
  44 #include <linux/usb.h>
  45 #include <linux/usbdevice_fs.h>
  46 #include <linux/cdev.h>
  47 #include <asm/uaccess.h>
  48 #include <asm/byteorder.h>
  49 #include <linux/moduleparam.h>
  50
  51 #include "hcd.h"        /* for usbcore internals */
  52 #include "usb.h"
  53
  54 #define USB_MAXBUS                      64
  55 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
  56 static struct class *usb_device_class;
  57
  58 struct async {
  59         struct list_head asynclist;
  60         struct dev_state *ps;
  61         struct task_struct *task;
  62         unsigned int signr;
  63         unsigned int ifnum;
  64         void __user *userbuffer;
  65         void __user *userurb;
  66         struct urb *urb;
  67 };
  68
  69 static int usbfs_snoop = 0;
  70 module_param (usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  71 MODULE_PARM_DESC (usbfs_snoop, "true to log all usbfs traffic");
  72
  73 #define snoop(dev, format, arg...)                              \
  74         do {                                                    \
  75                 if (usbfs_snoop)                                \
  76                         dev_info( dev , format , ## arg);       \
  77         } while (0)
  78
  79
  80 #define MAX_USBFS_BUFFER_SIZE   16384
  81
  82 static inline int connected (struct usb_device *dev)
  83 {
  84         return dev->state != USB_STATE_NOTATTACHED;
  85 }
  86
  87 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
  88 {
  89         loff_t ret;
  90
  91         lock_kernel();
  92
  93         switch (orig) {
  94         case 0:
  95                 file->f_pos = offset;
  96                 ret = file->f_pos;
  97                 break;
  98         case 1:
  99                 file->f_pos += offset;
 100                 ret = file->f_pos;
 101                 break;
 102         case 2:
 103         default:
 104                 ret = -EINVAL;
 105         }
 106
 107         unlock_kernel();
 108         return ret;
 109 }
 110
 111 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
 112 {
 113         struct dev_state *ps = (struct dev_state *)file->private_data;
 114         struct usb_device *dev = ps->dev;
 115         ssize_t ret = 0;
 116         unsigned len;
 117         loff_t pos;
 118         int i;
 119
 120         pos = *ppos;
 121         usb_lock_device(dev);
 122         if (!connected(dev)) {
 123                 ret = -ENODEV;
 124                 goto err;
 125         } else if (pos < 0) {
 126                 ret = -EINVAL;
 127                 goto err;
 128         }
 129
 130         if (pos < sizeof(struct usb_device_descriptor)) {
 131                 struct usb_device_descriptor *desc = kmalloc(sizeof(*desc), GFP_KERNEL);
 132                 if (!desc) {
 133                         ret = -ENOMEM;
 134                         goto err;
 135                 }
 136                 memcpy(desc, &dev->descriptor, sizeof(dev->descriptor));
 137                 le16_to_cpus(&desc->bcdUSB);
 138                 le16_to_cpus(&desc->idVendor);
 139                 le16_to_cpus(&desc->idProduct);
 140                 le16_to_cpus(&desc->bcdDevice);
 141
 142                 len = sizeof(struct usb_device_descriptor) - pos;
 143                 if (len > nbytes)
 144                         len = nbytes;
 145                 if (copy_to_user(buf, ((char *)desc) + pos, len)) {
 146                         kfree(desc);
 147                         ret = -EFAULT;
 148                         goto err;
 149                 }
 150                 kfree(desc);
 151
 152                 *ppos += len;
 153                 buf += len;
 154                 nbytes -= len;
 155                 ret += len;
 156         }
 157
 158         pos = sizeof(struct usb_device_descriptor);
 159         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 160                 struct usb_config_descriptor *config =
 161                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 162                 unsigned int length = le16_to_cpu(config->wTotalLength);
 163
 164                 if (*ppos < pos + length) {
 165
 166                         /* The descriptor may claim to be longer than it
 167                          * really is.  Here is the actual allocated length. */
 168                         unsigned alloclen =
 169                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 170
 171                         len = length - (*ppos - pos);
 172                         if (len > nbytes)
 173                                 len = nbytes;
 174
 175                         /* Simply don't write (skip over) unallocated parts */
 176                         if (alloclen > (*ppos - pos)) {
 177                                 alloclen -= (*ppos - pos);
 178                                 if (copy_to_user(buf,
 179                                     dev->rawdescriptors[i] + (*ppos - pos),
 180                                     min(len, alloclen))) {
 181                                         ret = -EFAULT;
 182                                         goto err;
 183                                 }
 184                         }
 185
 186                         *ppos += len;
 187                         buf += len;
 188                         nbytes -= len;
 189                         ret += len;
 190                 }
 191
 192                 pos += length;
 193         }
 194
 195 err:
 196         usb_unlock_device(dev);
 197         return ret;
 198 }
 199
 200 /*
 201  * async list handling
 202  */
 203
 204 static struct async *alloc_async(unsigned int numisoframes)
 205 {
 206         unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor);
 207         struct async *as = kmalloc(assize, GFP_KERNEL);
 208         if (!as)
 209                 return NULL;
 210         memset(as, 0, assize);
 211         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 212         if (!as->urb) {
 213                 kfree(as);
 214                 return NULL;
 215         }
 216         return as;
 217 }
 218
 219 static void free_async(struct async *as)
 220 {
 221         kfree(as->urb->transfer_buffer);
 222         kfree(as->urb->setup_packet);
 223         usb_free_urb(as->urb);
 224         kfree(as);
 225 }
 226
 227 static inline void async_newpending(struct async *as)
 228 {
 229         struct dev_state *ps = as->ps;
 230         unsigned long flags;
 231
 232         spin_lock_irqsave(&ps->lock, flags);
 233         list_add_tail(&as->asynclist, &ps->async_pending);
 234         spin_unlock_irqrestore(&ps->lock, flags);
 235 }
 236
 237 static inline void async_removepending(struct async *as)
 238 {
 239         struct dev_state *ps = as->ps;
 240         unsigned long flags;
 241
 242         spin_lock_irqsave(&ps->lock, flags);
 243         list_del_init(&as->asynclist);
 244         spin_unlock_irqrestore(&ps->lock, flags);
 245 }
 246
 247 static inline struct async *async_getcompleted(struct dev_state *ps)
 248 {
 249         unsigned long flags;
 250         struct async *as = NULL;
 251
 252         spin_lock_irqsave(&ps->lock, flags);
 253         if (!list_empty(&ps->async_completed)) {
 254                 as = list_entry(ps->async_completed.next, struct async, asynclist);
 255                 list_del_init(&as->asynclist);
 256         }
 257         spin_unlock_irqrestore(&ps->lock, flags);
 258         return as;
 259 }
 260
 261 static inline struct async *async_getpending(struct dev_state *ps, void __user *userurb)
 262 {
 263         unsigned long flags;
 264         struct async *as;
 265
 266         spin_lock_irqsave(&ps->lock, flags);
 267         list_for_each_entry(as, &ps->async_pending, asynclist)
 268                 if (as->userurb == userurb) {
 269                         list_del_init(&as->asynclist);
 270                         spin_unlock_irqrestore(&ps->lock, flags);
 271                         return as;
 272                 }
 273         spin_unlock_irqrestore(&ps->lock, flags);
 274         return NULL;
 275 }
 276
 277 static void async_completed(struct urb *urb, struct pt_regs *regs)
 278 {
 279         struct async *as = (struct async *)urb->context;
 280         struct dev_state *ps = as->ps;
 281         struct siginfo sinfo;
 282
 283         spin_lock(&ps->lock);
 284         list_move_tail(&as->asynclist, &ps->async_completed);
 285         spin_unlock(&ps->lock);
 286         if (as->signr) {
 287                 sinfo.si_signo = as->signr;
 288                 sinfo.si_errno = as->urb->status;
 289                 sinfo.si_code = SI_ASYNCIO;
 290                 sinfo.si_addr = as->userurb;
 291                 send_sig_info(as->signr, &sinfo, as->task);
 292         }
 293         wake_up(&ps->wait);
 294 }
 295
 296 static void destroy_async (struct dev_state *ps, struct list_head *list)
 297 {
 298         struct async *as;
 299         unsigned long flags;
 300
 301         spin_lock_irqsave(&ps->lock, flags);
 302         while (!list_empty(list)) {
 303                 as = list_entry(list->next, struct async, asynclist);
 304                 list_del_init(&as->asynclist);
 305
 306                 /* drop the spinlock so the completion handler can run */
 307                 spin_unlock_irqrestore(&ps->lock, flags);
 308                 usb_kill_urb(as->urb);
 309                 spin_lock_irqsave(&ps->lock, flags);
 310         }
 311         spin_unlock_irqrestore(&ps->lock, flags);
 312         as = async_getcompleted(ps);
 313         while (as) {
 314                 free_async(as);
 315                 as = async_getcompleted(ps);
 316         }
 317 }
 318
 319 static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum)
 320 {
 321         struct list_head *p, *q, hitlist;
 322         unsigned long flags;
 323
 324         INIT_LIST_HEAD(&hitlist);
 325         spin_lock_irqsave(&ps->lock, flags);
 326         list_for_each_safe(p, q, &ps->async_pending)
 327                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 328                         list_move_tail(p, &hitlist);
 329         spin_unlock_irqrestore(&ps->lock, flags);
 330         destroy_async(ps, &hitlist);
 331 }
 332
 333 static inline void destroy_all_async(struct dev_state *ps)
 334 {
 335                 destroy_async(ps, &ps->async_pending);
 336 }
 337
 338 /*
 339  * interface claims are made only at the request of user level code,
 340  * which can also release them (explicitly or by closing files).
 341  * they're also undone when devices disconnect.
 342  */
 343
 344 static int driver_probe (struct usb_interface *intf,
 345                          const struct usb_device_id *id)
 346 {
 347         return -ENODEV;
 348 }
 349
 350 static void driver_disconnect(struct usb_interface *intf)
 351 {
 352         struct dev_state *ps = usb_get_intfdata (intf);
 353         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 354
 355         if (!ps)
 356                 return;
 357
 358         /* NOTE:  this relies on usbcore having canceled and completed
 359          * all pending I/O requests; 2.6 does that.
 360          */
 361
 362         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 363                 clear_bit(ifnum, &ps->ifclaimed);
 364         else
 365                 warn("interface number %u out of range", ifnum);
 366
 367         usb_set_intfdata (intf, NULL);
 368
 369         /* force async requests to complete */
 370         destroy_async_on_interface(ps, ifnum);
 371 }
 372
 373 struct usb_driver usbfs_driver = {
 374         .owner =        THIS_MODULE,
 375         .name =         "usbfs",
 376         .probe =        driver_probe,
 377         .disconnect =   driver_disconnect,
 378 };
 379
 380 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 381 {
 382         struct usb_device *dev = ps->dev;
 383         struct usb_interface *intf;
 384         int err;
 385
 386         if (ifnum >= 8*sizeof(ps->ifclaimed))
 387                 return -EINVAL;
 388         /* already claimed */
 389         if (test_bit(ifnum, &ps->ifclaimed))
 390                 return 0;
 391
 392         /* lock against other changes to driver bindings */
 393         down_write(&usb_bus_type.subsys.rwsem);
 394         intf = usb_ifnum_to_if(dev, ifnum);
 395         if (!intf)
 396                 err = -ENOENT;
 397         else
 398                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 399         up_write(&usb_bus_type.subsys.rwsem);
 400         if (err == 0)
 401                 set_bit(ifnum, &ps->ifclaimed);
 402         return err;
 403 }
 404
 405 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 406 {
 407         struct usb_device *dev;
 408         struct usb_interface *intf;
 409         int err;
 410
 411         err = -EINVAL;
 412         if (ifnum >= 8*sizeof(ps->ifclaimed))
 413                 return err;
 414         dev = ps->dev;
 415         /* lock against other changes to driver bindings */
 416         down_write(&usb_bus_type.subsys.rwsem);
 417         intf = usb_ifnum_to_if(dev, ifnum);
 418         if (!intf)
 419                 err = -ENOENT;
 420         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 421                 usb_driver_release_interface(&usbfs_driver, intf);
 422                 err = 0;
 423         }
 424         up_write(&usb_bus_type.subsys.rwsem);
 425         return err;
 426 }
 427
 428 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 429 {
 430         if (ps->dev->state != USB_STATE_CONFIGURED)
 431                 return -EHOSTUNREACH;
 432         if (ifnum >= 8*sizeof(ps->ifclaimed))
 433                 return -EINVAL;
 434         if (test_bit(ifnum, &ps->ifclaimed))
 435                 return 0;
 436         /* if not yet claimed, claim it for the driver */
 437         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n",
 438                current->pid, current->comm, ifnum);
 439         return claimintf(ps, ifnum);
 440 }
 441
 442 static int findintfep(struct usb_device *dev, unsigned int ep)
 443 {
 444         unsigned int i, j, e;
 445         struct usb_interface *intf;
 446         struct usb_host_interface *alts;
 447         struct usb_endpoint_descriptor *endpt;
 448
 449         if (ep & ~(USB_DIR_IN|0xf))
 450                 return -EINVAL;
 451         if (!dev->actconfig)
 452                 return -ESRCH;
 453         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 454                 intf = dev->actconfig->interface[i];
 455                 for (j = 0; j < intf->num_altsetting; j++) {
 456                         alts = &intf->altsetting[j];
 457                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 458                                 endpt = &alts->endpoint[e].desc;
 459                                 if (endpt->bEndpointAddress == ep)
 460                                         return alts->desc.bInterfaceNumber;
 461                         }
 462                 }
 463         }
 464         return -ENOENT;
 465 }
 466
 467 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
 468 {
 469         int ret = 0;
 470
 471         if (ps->dev->state != USB_STATE_CONFIGURED)
 472                 return -EHOSTUNREACH;
 473         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 474                 return 0;
 475
 476         index &= 0xff;
 477         switch (requesttype & USB_RECIP_MASK) {
 478         case USB_RECIP_ENDPOINT:
 479                 if ((ret = findintfep(ps->dev, index)) >= 0)
 480                         ret = checkintf(ps, ret);
 481                 break;
 482
 483         case USB_RECIP_INTERFACE:
 484                 ret = checkintf(ps, index);
 485                 break;
 486         }
 487         return ret;
 488 }
 489
 490 /*
 491  * file operations
 492  */
 493 static int usbdev_open(struct inode *inode, struct file *file)
 494 {
 495         struct usb_device *dev = NULL;
 496         struct dev_state *ps;
 497         int ret;
 498
 499         /*
 500          * no locking necessary here, as chrdev_open has the kernel lock
 501          * (still acquire the kernel lock for safety)
 502          */
 503         ret = -ENOMEM;
 504         if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
 505                 goto out_nolock;
 506
 507         lock_kernel();
 508         ret = -ENOENT;
 509         /* check if we are called from a real node or usbfs */
 510         if (imajor(inode) == USB_DEVICE_MAJOR)
 511                 dev = usbdev_lookup_minor(iminor(inode));
 512         if (!dev)
 513                 dev = inode->u.generic_ip;
 514         if (!dev) {
 515                 kfree(ps);
 516                 goto out;
 517         }
 518         usb_get_dev(dev);
 519         ret = 0;
 520         ps->dev = dev;
 521         ps->file = file;
 522         spin_lock_init(&ps->lock);
 523         INIT_LIST_HEAD(&ps->async_pending);
 524         INIT_LIST_HEAD(&ps->async_completed);
 525         init_waitqueue_head(&ps->wait);
 526         ps->discsignr = 0;
 527         ps->disctask = current;
 528         ps->disccontext = NULL;
 529         ps->ifclaimed = 0;
 530         wmb();
 531         list_add_tail(&ps->list, &dev->filelist);
 532         file->private_data = ps;
 533  out:
 534         unlock_kernel();
 535  out_nolock:
 536         return ret;
 537 }
 538
 539 static int usbdev_release(struct inode *inode, struct file *file)
 540 {
 541         struct dev_state *ps = (struct dev_state *)file->private_data;
 542         struct usb_device *dev = ps->dev;
 543         unsigned int ifnum;
 544
 545         usb_lock_device(dev);
 546         list_del_init(&ps->list);
 547         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 548                         ifnum++) {
 549                 if (test_bit(ifnum, &ps->ifclaimed))
 550                         releaseintf(ps, ifnum);
 551         }
 552         destroy_all_async(ps);
 553         usb_unlock_device(dev);
 554         usb_put_dev(dev);
 555         ps->dev = NULL;
 556         kfree(ps);
 557         return 0;
 558 }
 559
 560 static int proc_control(struct dev_state *ps, void __user *arg)
 561 {
 562         struct usb_device *dev = ps->dev;
 563         struct usbdevfs_ctrltransfer ctrl;
 564         unsigned int tmo;
 565         unsigned char *tbuf;
 566         int i, j, ret;
 567
 568         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 569                 return -EFAULT;
 570         if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
 571                 return ret;
 572         if (ctrl.wLength > PAGE_SIZE)
 573                 return -EINVAL;
 574         if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
 575                 return -ENOMEM;
 576         tmo = ctrl.timeout;
 577         if (ctrl.bRequestType & 0x80) {
 578                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
 579                         free_page((unsigned long)tbuf);
 580                         return -EINVAL;
 581                 }
 582                 snoop(&dev->dev, "control read: bRequest=%02x "
 583                                 "bRrequestType=%02x wValue=%04x "
 584                                 "wIndex=%04x wLength=%04x\n",
 585                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 586                                 ctrl.wIndex, ctrl.wLength);
 587
 588                 usb_unlock_device(dev);
 589                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 590                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 591                 usb_lock_device(dev);
 592                 if ((i > 0) && ctrl.wLength) {
 593                         if (usbfs_snoop) {
 594                                 dev_info(&dev->dev, "control read: data ");
 595                                 for (j = 0; j < i; ++j)
 596                                         printk ("%02x ", (unsigned char)(tbuf)[j]);
 597                                 printk("\n");
 598                         }
 599                         if (copy_to_user(ctrl.data, tbuf, i)) {
 600                                 free_page((unsigned long)tbuf);
 601                                 return -EFAULT;
 602                         }
 603                 }
 604         } else {
 605                 if (ctrl.wLength) {
 606                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 607                                 free_page((unsigned long)tbuf);
 608                                 return -EFAULT;
 609                         }
 610                 }
 611                 snoop(&dev->dev, "control write: bRequest=%02x "
 612                                 "bRrequestType=%02x wValue=%04x "
 613                                 "wIndex=%04x wLength=%04x\n",
 614                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 615                                 ctrl.wIndex, ctrl.wLength);
 616                 if (usbfs_snoop) {
 617                         dev_info(&dev->dev, "control write: data: ");
 618                         for (j = 0; j < ctrl.wLength; ++j)
 619                                 printk ("%02x ", (unsigned char)(tbuf)[j]);
 620                         printk("\n");
 621                 }
 622                 usb_unlock_device(dev);
 623                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 624                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 625                 usb_lock_device(dev);
 626         }
 627         free_page((unsigned long)tbuf);
 628         if (i<0 && i != -EPIPE) {
 629                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 630                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 631                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 632                            ctrl.wLength, i);
 633         }
 634         return i;
 635 }
 636
 637 static int proc_bulk(struct dev_state *ps, void __user *arg)
 638 {
 639         struct usb_device *dev = ps->dev;
 640         struct usbdevfs_bulktransfer bulk;
 641         unsigned int tmo, len1, pipe;
 642         int len2;
 643         unsigned char *tbuf;
 644         int i, ret;
 645
 646         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 647                 return -EFAULT;
 648         if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
 649                 return ret;
 650         if ((ret = checkintf(ps, ret)))
 651                 return ret;
 652         if (bulk.ep & USB_DIR_IN)
 653                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 654         else
 655                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 656         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 657                 return -EINVAL;
 658         len1 = bulk.len;
 659         if (len1 > MAX_USBFS_BUFFER_SIZE)
 660                 return -EINVAL;
 661         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 662                 return -ENOMEM;
 663         tmo = bulk.timeout;
 664         if (bulk.ep & 0x80) {
 665                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 666                         kfree(tbuf);
 667                         return -EINVAL;
 668                 }
 669                 usb_unlock_device(dev);
 670                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 671                 usb_lock_device(dev);
 672                 if (!i && len2) {
 673                         if (copy_to_user(bulk.data, tbuf, len2)) {
 674                                 kfree(tbuf);
 675                                 return -EFAULT;
 676                         }
 677                 }
 678         } else {
 679                 if (len1) {
 680                         if (copy_from_user(tbuf, bulk.data, len1)) {
 681                                 kfree(tbuf);
 682                                 return -EFAULT;
 683                         }
 684                 }
 685                 usb_unlock_device(dev);
 686                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 687                 usb_lock_device(dev);
 688         }
 689         kfree(tbuf);
 690         if (i < 0)
 691                 return i;
 692         return len2;
 693 }
 694
 695 static int proc_resetep(struct dev_state *ps, void __user *arg)
 696 {
 697         unsigned int ep;
 698         int ret;
 699
 700         if (get_user(ep, (unsigned int __user *)arg))
 701                 return -EFAULT;
 702         if ((ret = findintfep(ps->dev, ep)) < 0)
 703                 return ret;
 704         if ((ret = checkintf(ps, ret)))
 705                 return ret;
 706         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
 707         return 0;
 708 }
 709
 710 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 711 {
 712         unsigned int ep;
 713         int pipe;
 714         int ret;
 715
 716         if (get_user(ep, (unsigned int __user *)arg))
 717                 return -EFAULT;
 718         if ((ret = findintfep(ps->dev, ep)) < 0)
 719                 return ret;
 720         if ((ret = checkintf(ps, ret)))
 721                 return ret;
 722         if (ep & USB_DIR_IN)
 723                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 724         else
 725                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 726
 727         return usb_clear_halt(ps->dev, pipe);
 728 }
 729
 730
 731 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 732 {
 733         struct usbdevfs_getdriver gd;
 734         struct usb_interface *intf;
 735         int ret;
 736
 737         if (copy_from_user(&gd, arg, sizeof(gd)))
 738                 return -EFAULT;
 739         down_read(&usb_bus_type.subsys.rwsem);
 740         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 741         if (!intf || !intf->dev.driver)
 742                 ret = -ENODATA;
 743         else {
 744                 strncpy(gd.driver, intf->dev.driver->name,
 745                                 sizeof(gd.driver));
 746                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 747         }
 748         up_read(&usb_bus_type.subsys.rwsem);
 749         return ret;
 750 }
 751
 752 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 753 {
 754         struct usbdevfs_connectinfo ci;
 755
 756         ci.devnum = ps->dev->devnum;
 757         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 758         if (copy_to_user(arg, &ci, sizeof(ci)))
 759                 return -EFAULT;
 760         return 0;
 761 }
 762
 763 static int proc_resetdevice(struct dev_state *ps)
 764 {
 765         return usb_reset_device(ps->dev);
 766
 767 }
 768
 769 static int proc_setintf(struct dev_state *ps, void __user *arg)
 770 {
 771         struct usbdevfs_setinterface setintf;
 772         int ret;
 773
 774         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 775                 return -EFAULT;
 776         if ((ret = checkintf(ps, setintf.interface)))
 777                 return ret;
 778         return usb_set_interface(ps->dev, setintf.interface,
 779                         setintf.altsetting);
 780 }
 781
 782 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 783 {
 784         unsigned int u;
 785         int status = 0;
 786         struct usb_host_config *actconfig;
 787
 788         if (get_user(u, (unsigned int __user *)arg))
 789                 return -EFAULT;
 790
 791         actconfig = ps->dev->actconfig;
 792
 793         /* Don't touch the device if any interfaces are claimed.
 794          * It could interfere with other drivers' operations, and if
 795          * an interface is claimed by usbfs it could easily deadlock.
 796          */
 797         if (actconfig) {
 798                 int i;
 799
 800                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 801                         if (usb_interface_claimed(actconfig->interface[i])) {
 802                                 dev_warn (&ps->dev->dev,
 803                                         "usbfs: interface %d claimed by %s "
 804                                         "while '%s' sets config #%d\n",
 805                                         actconfig->interface[i]
 806                                                 ->cur_altsetting
 807                                                 ->desc.bInterfaceNumber,
 808                                         actconfig->interface[i]
 809                                                 ->dev.driver->name,
 810                                         current->comm, u);
 811                                 status = -EBUSY;
 812                                 break;
 813                         }
 814                 }
 815         }
 816
 817         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 818          * so avoid usb_set_configuration()'s kick to sysfs
 819          */
 820         if (status == 0) {
 821                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 822                         status = usb_reset_configuration(ps->dev);
 823                 else
 824                         status = usb_set_configuration(ps->dev, u);
 825         }
 826
 827         return status;
 828 }
 829
 830
 831 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 832                              struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
 833                              void __user *arg)
 834 {
 835         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 836         struct usb_host_endpoint *ep;
 837         struct async *as;
 838         struct usb_ctrlrequest *dr = NULL;
 839         unsigned int u, totlen, isofrmlen;
 840         int ret, interval = 0, ifnum = -1;
 841
 842         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
 843                            URB_NO_FSBR|URB_ZERO_PACKET))
 844                 return -EINVAL;
 845         if (!uurb->buffer)
 846                 return -EINVAL;
 847         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
 848                 return -EINVAL;
 849         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
 850                 if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
 851                         return ifnum;
 852                 if ((ret = checkintf(ps, ifnum)))
 853                         return ret;
 854         }
 855         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0)
 856                 ep = ps->dev->ep_in [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 857         else
 858                 ep = ps->dev->ep_out [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 859         if (!ep)
 860                 return -ENOENT;
 861         switch(uurb->type) {
 862         case USBDEVFS_URB_TYPE_CONTROL:
 863                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 864                                 != USB_ENDPOINT_XFER_CONTROL)
 865                         return -EINVAL;
 866                 /* min 8 byte setup packet, max arbitrary */
 867                 if (uurb->buffer_length < 8 || uurb->buffer_length > PAGE_SIZE)
 868                         return -EINVAL;
 869                 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
 870                         return -ENOMEM;
 871                 if (copy_from_user(dr, uurb->buffer, 8)) {
 872                         kfree(dr);
 873                         return -EFAULT;
 874                 }
 875                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
 876                         kfree(dr);
 877                         return -EINVAL;
 878                 }
 879                 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
 880                         kfree(dr);
 881                         return ret;
 882                 }
 883                 uurb->endpoint = (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK);
 884                 uurb->number_of_packets = 0;
 885                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
 886                 uurb->buffer += 8;
 887                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ?  VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) {
 888                         kfree(dr);
 889                         return -EFAULT;
 890                 }
 891                 break;
 892
 893         case USBDEVFS_URB_TYPE_BULK:
 894                 switch (ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 895                 case USB_ENDPOINT_XFER_CONTROL:
 896                 case USB_ENDPOINT_XFER_ISOC:
 897                         return -EINVAL;
 898                 /* allow single-shot interrupt transfers, at bogus rates */
 899                 }
 900                 uurb->number_of_packets = 0;
 901                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
 902                         return -EINVAL;
 903                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
 904                         return -EFAULT;
 905                 break;
 906
 907         case USBDEVFS_URB_TYPE_ISO:
 908                 /* arbitrary limit */
 909                 if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
 910                         return -EINVAL;
 911                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 912                                 != USB_ENDPOINT_XFER_ISOC)
 913                         return -EINVAL;
 914                 interval = 1 << min (15, ep->desc.bInterval - 1);
 915                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
 916                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
 917                         return -ENOMEM;
 918                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
 919                         kfree(isopkt);
 920                         return -EFAULT;
 921                 }
 922                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
 923                         if (isopkt[u].length > 1023) {
 924                                 kfree(isopkt);
 925                                 return -EINVAL;
 926                         }
 927                         totlen += isopkt[u].length;
 928                 }
 929                 if (totlen > 32768) {
 930                         kfree(isopkt);
 931                         return -EINVAL;
 932                 }
 933                 uurb->buffer_length = totlen;
 934                 break;
 935
 936         case USBDEVFS_URB_TYPE_INTERRUPT:
 937                 uurb->number_of_packets = 0;
 938                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 939                                 != USB_ENDPOINT_XFER_INT)
 940                         return -EINVAL;
 941                 if (ps->dev->speed == USB_SPEED_HIGH)
 942                         interval = 1 << min (15, ep->desc.bInterval - 1);
 943                 else
 944                         interval = ep->desc.bInterval;
 945                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
 946                         return -EINVAL;
 947                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
 948                         return -EFAULT;
 949                 break;
 950
 951         default:
 952                 return -EINVAL;
 953         }
 954         if (!(as = alloc_async(uurb->number_of_packets))) {
 955                 kfree(isopkt);
 956                 kfree(dr);
 957                 return -ENOMEM;
 958         }
 959         if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
 960                 kfree(isopkt);
 961                 kfree(dr);
 962                 free_async(as);
 963                 return -ENOMEM;
 964         }
 965         as->urb->dev = ps->dev;
 966         as->urb->pipe = (uurb->type << 30) | __create_pipe(ps->dev, uurb->endpoint & 0xf) | (uurb->endpoint & USB_DIR_IN);
 967         as->urb->transfer_flags = uurb->flags;
 968         as->urb->transfer_buffer_length = uurb->buffer_length;
 969         as->urb->setup_packet = (unsigned char*)dr;
 970         as->urb->start_frame = uurb->start_frame;
 971         as->urb->number_of_packets = uurb->number_of_packets;
 972         as->urb->interval = interval;
 973         as->urb->context = as;
 974         as->urb->complete = async_completed;
 975         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
 976                 as->urb->iso_frame_desc[u].offset = totlen;
 977                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
 978                 totlen += isopkt[u].length;
 979         }
 980         kfree(isopkt);
 981         as->ps = ps;
 982         as->userurb = arg;
 983         if (uurb->endpoint & USB_DIR_IN)
 984                 as->userbuffer = uurb->buffer;
 985         else
 986                 as->userbuffer = NULL;
 987         as->signr = uurb->signr;
 988         as->ifnum = ifnum;
 989         as->task = current;
 990         if (!(uurb->endpoint & USB_DIR_IN)) {
 991                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, as->urb->transfer_buffer_length)) {
 992                         free_async(as);
 993                         return -EFAULT;
 994                 }
 995         }
 996         async_newpending(as);
 997         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
 998                 dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
 999                 async_removepending(as);
1000                 free_async(as);
1001                 return ret;
1002         }
1003         return 0;
1004 }
1005
1006 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1007 {
1008         struct usbdevfs_urb uurb;
1009
1010         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1011                 return -EFAULT;
1012
1013         return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg);
1014 }
1015
1016 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1017 {
1018         struct async *as;
1019
1020         as = async_getpending(ps, arg);
1021         if (!as)
1022                 return -EINVAL;
1023         usb_kill_urb(as->urb);
1024         return 0;
1025 }
1026
1027 static int processcompl(struct async *as, void __user * __user *arg)
1028 {
1029         struct urb *urb = as->urb;
1030         struct usbdevfs_urb __user *userurb = as->userurb;
1031         void __user *addr = as->userurb;
1032         unsigned int i;
1033
1034         if (as->userbuffer)
1035                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1036                         return -EFAULT;
1037         if (put_user(urb->status, &userurb->status))
1038                 return -EFAULT;
1039         if (put_user(urb->actual_length, &userurb->actual_length))
1040                 return -EFAULT;
1041         if (put_user(urb->error_count, &userurb->error_count))
1042                 return -EFAULT;
1043
1044         if (usb_pipeisoc(urb->pipe)) {
1045                 for (i = 0; i < urb->number_of_packets; i++) {
1046                         if (put_user(urb->iso_frame_desc[i].actual_length,
1047                                      &userurb->iso_frame_desc[i].actual_length))
1048                                 return -EFAULT;
1049                         if (put_user(urb->iso_frame_desc[i].status,
1050                                      &userurb->iso_frame_desc[i].status))
1051                                 return -EFAULT;
1052                 }
1053         }
1054
1055         free_async(as);
1056
1057         if (put_user(addr, (void __user * __user *)arg))
1058                 return -EFAULT;
1059         return 0;
1060 }
1061
1062 static struct async* reap_as(struct dev_state *ps)
1063 {
1064         DECLARE_WAITQUEUE(wait, current);
1065         struct async *as = NULL;
1066         struct usb_device *dev = ps->dev;
1067
1068         add_wait_queue(&ps->wait, &wait);
1069         for (;;) {
1070                 __set_current_state(TASK_INTERRUPTIBLE);
1071                 if ((as = async_getcompleted(ps)))
1072                         break;
1073                 if (signal_pending(current))
1074                         break;
1075                 usb_unlock_device(dev);
1076                 schedule();
1077                 usb_lock_device(dev);
1078         }
1079         remove_wait_queue(&ps->wait, &wait);
1080         set_current_state(TASK_RUNNING);
1081         return as;
1082 }
1083
1084 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1085 {
1086         struct async *as = reap_as(ps);
1087         if (as)
1088                 return processcompl(as, (void __user * __user *)arg);
1089         if (signal_pending(current))
1090                 return -EINTR;
1091         return -EIO;
1092 }
1093
1094 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1095 {
1096         struct async *as;
1097
1098         if (!(as = async_getcompleted(ps)))
1099                 return -EAGAIN;
1100         return processcompl(as, (void __user * __user *)arg);
1101 }
1102
1103 #ifdef CONFIG_COMPAT
1104
1105 static int get_urb32(struct usbdevfs_urb *kurb,
1106                      struct usbdevfs_urb32 __user *uurb)
1107 {
1108         __u32  uptr;
1109         if (get_user(kurb->type, &uurb->type) ||
1110             __get_user(kurb->endpoint, &uurb->endpoint) ||
1111             __get_user(kurb->status, &uurb->status) ||
1112             __get_user(kurb->flags, &uurb->flags) ||
1113             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1114             __get_user(kurb->actual_length, &uurb->actual_length) ||
1115             __get_user(kurb->start_frame, &uurb->start_frame) ||
1116             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1117             __get_user(kurb->error_count, &uurb->error_count) ||
1118             __get_user(kurb->signr, &uurb->signr))
1119                 return -EFAULT;
1120
1121         if (__get_user(uptr, &uurb->buffer))
1122                 return -EFAULT;
1123         kurb->buffer = compat_ptr(uptr);
1124         if (__get_user(uptr, &uurb->buffer))
1125                 return -EFAULT;
1126         kurb->usercontext = compat_ptr(uptr);
1127
1128         return 0;
1129 }
1130
1131 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1132 {
1133         struct usbdevfs_urb uurb;
1134
1135         if (get_urb32(&uurb,(struct usbdevfs_urb32 *)arg))
1136                 return -EFAULT;
1137
1138         return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg);
1139 }
1140
1141 static int processcompl_compat(struct async *as, void __user * __user *arg)
1142 {
1143         struct urb *urb = as->urb;
1144         struct usbdevfs_urb32 __user *userurb = as->userurb;
1145         void __user *addr = as->userurb;
1146         unsigned int i;
1147
1148         if (as->userbuffer)
1149                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1150                         return -EFAULT;
1151         if (put_user(urb->status, &userurb->status))
1152                 return -EFAULT;
1153         if (put_user(urb->actual_length, &userurb->actual_length))
1154                 return -EFAULT;
1155         if (put_user(urb->error_count, &userurb->error_count))
1156                 return -EFAULT;
1157
1158         if (usb_pipeisoc(urb->pipe)) {
1159                 for (i = 0; i < urb->number_of_packets; i++) {
1160                         if (put_user(urb->iso_frame_desc[i].actual_length,
1161                                      &userurb->iso_frame_desc[i].actual_length))
1162                                 return -EFAULT;
1163                         if (put_user(urb->iso_frame_desc[i].status,
1164                                      &userurb->iso_frame_desc[i].status))
1165                                 return -EFAULT;
1166                 }
1167         }
1168
1169         free_async(as);
1170         if (put_user((u32)(u64)addr, (u32 __user *)arg))
1171                 return -EFAULT;
1172         return 0;
1173 }
1174
1175 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1176 {
1177         struct async *as = reap_as(ps);
1178         if (as)
1179                 return processcompl_compat(as, (void __user * __user *)arg);
1180         if (signal_pending(current))
1181                 return -EINTR;
1182         return -EIO;
1183 }
1184
1185 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1186 {
1187         struct async *as;
1188
1189         if (!(as = async_getcompleted(ps)))
1190                 return -EAGAIN;
1191         return processcompl_compat(as, (void __user * __user *)arg);
1192 }
1193
1194 #endif
1195
1196 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1197 {
1198         struct usbdevfs_disconnectsignal ds;
1199
1200         if (copy_from_user(&ds, arg, sizeof(ds)))
1201                 return -EFAULT;
1202         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1203                 return -EINVAL;
1204         ps->discsignr = ds.signr;
1205         ps->disccontext = ds.context;
1206         return 0;
1207 }
1208
1209 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1210 {
1211         unsigned int ifnum;
1212
1213         if (get_user(ifnum, (unsigned int __user *)arg))
1214                 return -EFAULT;
1215         return claimintf(ps, ifnum);
1216 }
1217
1218 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1219 {
1220         unsigned int ifnum;
1221         int ret;
1222
1223         if (get_user(ifnum, (unsigned int __user *)arg))
1224                 return -EFAULT;
1225         if ((ret = releaseintf(ps, ifnum)) < 0)
1226                 return ret;
1227         destroy_async_on_interface (ps, ifnum);
1228         return 0;
1229 }
1230
1231 static int proc_ioctl (struct dev_state *ps, void __user *arg)
1232 {
1233         struct usbdevfs_ioctl   ctrl;
1234         int                     size;
1235         void                    *buf = NULL;
1236         int                     retval = 0;
1237         struct usb_interface    *intf = NULL;
1238         struct usb_driver       *driver = NULL;
1239         int                     i;
1240
1241         /* get input parameters and alloc buffer */
1242         if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
1243                 return -EFAULT;
1244         if ((size = _IOC_SIZE (ctrl.ioctl_code)) > 0) {
1245                 if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
1246                         return -ENOMEM;
1247                 if ((_IOC_DIR(ctrl.ioctl_code) & _IOC_WRITE)) {
1248                         if (copy_from_user (buf, ctrl.data, size)) {
1249                                 kfree(buf);
1250                                 return -EFAULT;
1251                         }
1252                 } else {
1253                         memset (buf, 0, size);
1254                 }
1255         }
1256
1257         if (!connected(ps->dev)) {
1258                 kfree(buf);
1259                 return -ENODEV;
1260         }
1261
1262         if (ps->dev->state != USB_STATE_CONFIGURED)
1263                 retval = -EHOSTUNREACH;
1264         else if (!(intf = usb_ifnum_to_if (ps->dev, ctrl.ifno)))
1265                retval = -EINVAL;
1266         else switch (ctrl.ioctl_code) {
1267
1268         /* disconnect kernel driver from interface */
1269         case USBDEVFS_DISCONNECT:
1270
1271                 /* don't allow the user to unbind the hub driver from
1272                  * a hub with children to manage */
1273                 for (i = 0; i < ps->dev->maxchild; ++i) {
1274                         if (ps->dev->children[i])
1275                                 retval = -EBUSY;
1276                 }
1277                 if (retval)
1278                         break;
1279
1280                 down_write(&usb_bus_type.subsys.rwsem);
1281                 if (intf->dev.driver) {
1282                         driver = to_usb_driver(intf->dev.driver);
1283                         dev_dbg (&intf->dev, "disconnect by usbfs\n");
1284                         usb_driver_release_interface(driver, intf);
1285                 } else
1286                         retval = -ENODATA;
1287                 up_write(&usb_bus_type.subsys.rwsem);
1288                 break;
1289
1290         /* let kernel drivers try to (re)bind to the interface */
1291         case USBDEVFS_CONNECT:
1292                 usb_unlock_device(ps->dev);
1293                 usb_lock_all_devices();
1294                 bus_rescan_devices(intf->dev.bus);
1295                 usb_unlock_all_devices();
1296                 usb_lock_device(ps->dev);
1297                 break;
1298
1299         /* talk directly to the interface's driver */
1300         default:
1301                 down_read(&usb_bus_type.subsys.rwsem);
1302                 if (intf->dev.driver)
1303                         driver = to_usb_driver(intf->dev.driver);
1304                 if (driver == NULL || driver->ioctl == NULL) {
1305                         retval = -ENOTTY;
1306                 } else {
1307                         retval = driver->ioctl (intf, ctrl.ioctl_code, buf);
1308                         if (retval == -ENOIOCTLCMD)
1309                                 retval = -ENOTTY;
1310                 }
1311                 up_read(&usb_bus_type.subsys.rwsem);
1312         }
1313
1314         /* cleanup and return */
1315         if (retval >= 0
1316                         && (_IOC_DIR (ctrl.ioctl_code) & _IOC_READ) != 0
1317                         && size > 0
1318                         && copy_to_user (ctrl.data, buf, size) != 0)
1319                 retval = -EFAULT;
1320
1321         kfree(buf);
1322         return retval;
1323 }
1324
1325 /*
1326  * NOTE:  All requests here that have interface numbers as parameters
1327  * are assuming that somehow the configuration has been prevented from
1328  * changing.  But there's no mechanism to ensure that...
1329  */
1330 static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1331 {
1332         struct dev_state *ps = (struct dev_state *)file->private_data;
1333         struct usb_device *dev = ps->dev;
1334         void __user *p = (void __user *)arg;
1335         int ret = -ENOTTY;
1336
1337         if (!(file->f_mode & FMODE_WRITE))
1338                 return -EPERM;
1339         usb_lock_device(dev);
1340         if (!connected(dev)) {
1341                 usb_unlock_device(dev);
1342                 return -ENODEV;
1343         }
1344
1345         switch (cmd) {
1346         case USBDEVFS_CONTROL:
1347                 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
1348                 ret = proc_control(ps, p);
1349                 if (ret >= 0)
1350                         inode->i_mtime = CURRENT_TIME;
1351                 break;
1352
1353         case USBDEVFS_BULK:
1354                 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
1355                 ret = proc_bulk(ps, p);
1356                 if (ret >= 0)
1357                         inode->i_mtime = CURRENT_TIME;
1358                 break;
1359
1360         case USBDEVFS_RESETEP:
1361                 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
1362                 ret = proc_resetep(ps, p);
1363                 if (ret >= 0)
1364                         inode->i_mtime = CURRENT_TIME;
1365                 break;
1366
1367         case USBDEVFS_RESET:
1368                 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
1369                 ret = proc_resetdevice(ps);
1370                 break;
1371
1372         case USBDEVFS_CLEAR_HALT:
1373                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
1374                 ret = proc_clearhalt(ps, p);
1375                 if (ret >= 0)
1376                         inode->i_mtime = CURRENT_TIME;
1377                 break;
1378
1379         case USBDEVFS_GETDRIVER:
1380                 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
1381                 ret = proc_getdriver(ps, p);
1382                 break;
1383
1384         case USBDEVFS_CONNECTINFO:
1385                 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
1386                 ret = proc_connectinfo(ps, p);
1387                 break;
1388
1389         case USBDEVFS_SETINTERFACE:
1390                 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
1391                 ret = proc_setintf(ps, p);
1392                 break;
1393
1394         case USBDEVFS_SETCONFIGURATION:
1395                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
1396                 ret = proc_setconfig(ps, p);
1397                 break;
1398
1399         case USBDEVFS_SUBMITURB:
1400                 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
1401                 ret = proc_submiturb(ps, p);
1402                 if (ret >= 0)
1403                         inode->i_mtime = CURRENT_TIME;
1404                 break;
1405
1406 #ifdef CONFIG_COMPAT
1407
1408         case USBDEVFS_SUBMITURB32:
1409                 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
1410                 ret = proc_submiturb_compat(ps, p);
1411                 if (ret >= 0)
1412                         inode->i_mtime = CURRENT_TIME;
1413                 break;
1414
1415         case USBDEVFS_REAPURB32:
1416                 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
1417                 ret = proc_reapurb_compat(ps, p);
1418                 break;
1419
1420         case USBDEVFS_REAPURBNDELAY32:
1421                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
1422                 ret = proc_reapurbnonblock_compat(ps, p);
1423                 break;
1424
1425 #endif
1426
1427         case USBDEVFS_DISCARDURB:
1428                 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
1429                 ret = proc_unlinkurb(ps, p);
1430                 break;
1431
1432         case USBDEVFS_REAPURB:
1433                 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
1434                 ret = proc_reapurb(ps, p);
1435                 break;
1436
1437         case USBDEVFS_REAPURBNDELAY:
1438                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
1439                 ret = proc_reapurbnonblock(ps, p);
1440                 break;
1441
1442         case USBDEVFS_DISCSIGNAL:
1443                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
1444                 ret = proc_disconnectsignal(ps, p);
1445                 break;
1446
1447         case USBDEVFS_CLAIMINTERFACE:
1448                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
1449                 ret = proc_claiminterface(ps, p);
1450                 break;
1451
1452         case USBDEVFS_RELEASEINTERFACE:
1453                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
1454                 ret = proc_releaseinterface(ps, p);
1455                 break;
1456
1457         case USBDEVFS_IOCTL:
1458                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1459                 ret = proc_ioctl(ps, p);
1460                 break;
1461         }
1462         usb_unlock_device(dev);
1463         if (ret >= 0)
1464                 inode->i_atime = CURRENT_TIME;
1465         return ret;
1466 }
1467
1468 /* No kernel lock - fine */
1469 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
1470 {
1471         struct dev_state *ps = (struct dev_state *)file->private_data;
1472         unsigned int mask = 0;
1473
1474         poll_wait(file, &ps->wait, wait);
1475         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1476                 mask |= POLLOUT | POLLWRNORM;
1477         if (!connected(ps->dev))
1478                 mask |= POLLERR | POLLHUP;
1479         return mask;
1480 }
1481
1482 struct file_operations usbfs_device_file_operations = {
1483         .llseek =       usbdev_lseek,
1484         .read =         usbdev_read,
1485         .poll =         usbdev_poll,
1486         .ioctl =        usbdev_ioctl,
1487         .open =         usbdev_open,
1488         .release =      usbdev_release,
1489 };
1490
1491 struct usb_device *usbdev_lookup_minor(int minor)
1492 {
1493         struct class_device *class_dev;
1494         struct usb_device *dev = NULL;
1495
1496         down(&usb_device_class->sem);
1497         list_for_each_entry(class_dev, &usb_device_class->children, node) {
1498                 if (class_dev->devt == MKDEV(USB_DEVICE_MAJOR, minor)) {
1499                         dev = class_dev->class_data;
1500                         break;
1501                 }
1502         }
1503         up(&usb_device_class->sem);
1504
1505         return dev;
1506 };
1507
1508 void usbdev_add(struct usb_device *dev)
1509 {
1510         int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1511
1512         dev->class_dev = class_device_create(usb_device_class,
1513                                 MKDEV(USB_DEVICE_MAJOR, minor), &dev->dev,
1514                                 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1515
1516         dev->class_dev->class_data = dev;
1517 }
1518
1519 void usbdev_remove(struct usb_device *dev)
1520 {
1521         class_device_unregister(dev->class_dev);
1522 }
1523
1524 static struct cdev usb_device_cdev = {
1525         .kobj   = {.name = "usb_device", },
1526         .owner  = THIS_MODULE,
1527 };
1528
1529 int __init usbdev_init(void)
1530 {
1531         int retval;
1532
1533         retval = register_chrdev_region(MKDEV(USB_DEVICE_MAJOR, 0),
1534                                         USB_DEVICE_MAX, "usb_device");
1535         if (retval) {
1536                 err("unable to register minors for usb_device");
1537                 goto out;
1538         }
1539         cdev_init(&usb_device_cdev, &usbfs_device_file_operations);
1540         retval = cdev_add(&usb_device_cdev,
1541                           MKDEV(USB_DEVICE_MAJOR, 0), USB_DEVICE_MAX);
1542         if (retval) {
1543                 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1544                 unregister_chrdev_region(USB_DEVICE_MAJOR, USB_DEVICE_MAX);
1545                 goto out;
1546         }
1547         usb_device_class = class_create(THIS_MODULE, "usb_device");
1548         if (IS_ERR(usb_device_class)) {
1549                 err("unable to register usb_device class");
1550                 retval = PTR_ERR(usb_device_class);
1551                 usb_device_class = NULL;
1552                 cdev_del(&usb_device_cdev);
1553                 unregister_chrdev_region(USB_DEVICE_MAJOR, USB_DEVICE_MAX);
1554         }
1555
1556 out:
1557         return retval;
1558 }
1559
1560 void usbdev_cleanup(void)
1561 {
1562         class_destroy(usb_device_class);
1563         cdev_del(&usb_device_cdev);
1564         unregister_chrdev_region(USB_DEVICE_MAJOR, USB_DEVICE_MAX);
1565 }
1566