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

   1 /*****************************************************************************/
   2
   3 /*
   4  *      devio.c  --  User space communication with USB devices.
   5  *
   6  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   7  *
   8  *      This program is free software; you can redistribute it and/or modify
   9  *      it under the terms of the GNU General Public License as published by
  10  *      the Free Software Foundation; either version 2 of the License, or
  11  *      (at your option) any later version.
  12  *
  13  *      This program is distributed in the hope that it will be useful,
  14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *      GNU General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License
  19  *      along with this program; if not, write to the Free Software
  20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  *  $Id: devio.c,v 1.7 2000/02/01 17:28:48 fliegl Exp $
  23  *
  24  *  This file implements the usbfs/x/y files, where
  25  *  x is the bus number and y the device number.
  26  *
  27  *  It allows user space programs/"drivers" to communicate directly
  28  *  with USB devices without intervening kernel driver.
  29  *
  30  *  Revision history
  31  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  32  *    04.01.2000   0.2   Turned into its own filesystem
  33  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  34  *                       (CAN-2005-3055)
  35  */
  36
  37 /*****************************************************************************/
  38
  39 #include <linux/fs.h>
  40 #include <linux/mm.h>
  41 #include <linux/slab.h>
  42 #include <linux/smp_lock.h>
  43 #include <linux/signal.h>
  44 #include <linux/poll.h>
  45 #include <linux/module.h>
  46 #include <linux/usb.h>
  47 #include <linux/usbdevice_fs.h>
  48 #include <linux/cdev.h>
  49 #include <linux/notifier.h>
  50 #include <asm/uaccess.h>
  51 #include <asm/byteorder.h>
  52 #include <linux/moduleparam.h>
  53
  54 #include "hcd.h"        /* for usbcore internals */
  55 #include "usb.h"
  56
  57 #define USB_MAXBUS                      64
  58 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
  59 static struct class *usb_device_class;
  60
  61 struct async {
  62         struct list_head asynclist;
  63         struct dev_state *ps;
  64         pid_t pid;
  65         uid_t uid, euid;
  66         unsigned int signr;
  67         unsigned int ifnum;
  68         void __user *userbuffer;
  69         void __user *userurb;
  70         struct urb *urb;
  71 };
  72
  73 static int usbfs_snoop = 0;
  74 module_param (usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  75 MODULE_PARM_DESC (usbfs_snoop, "true to log all usbfs traffic");
  76
  77 #define snoop(dev, format, arg...)                              \
  78         do {                                                    \
  79                 if (usbfs_snoop)                                \
  80                         dev_info( dev , format , ## arg);       \
  81         } while (0)
  82
  83 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
  84
  85
  86 #define MAX_USBFS_BUFFER_SIZE   16384
  87
  88 static inline int connected (struct usb_device *dev)
  89 {
  90         return dev->state != USB_STATE_NOTATTACHED;
  91 }
  92
  93 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
  94 {
  95         loff_t ret;
  96
  97         lock_kernel();
  98
  99         switch (orig) {
 100         case 0:
 101                 file->f_pos = offset;
 102                 ret = file->f_pos;
 103                 break;
 104         case 1:
 105                 file->f_pos += offset;
 106                 ret = file->f_pos;
 107                 break;
 108         case 2:
 109         default:
 110                 ret = -EINVAL;
 111         }
 112
 113         unlock_kernel();
 114         return ret;
 115 }
 116
 117 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
 118 {
 119         struct dev_state *ps = (struct dev_state *)file->private_data;
 120         struct usb_device *dev = ps->dev;
 121         ssize_t ret = 0;
 122         unsigned len;
 123         loff_t pos;
 124         int i;
 125
 126         pos = *ppos;
 127         usb_lock_device(dev);
 128         if (!connected(dev)) {
 129                 ret = -ENODEV;
 130                 goto err;
 131         } else if (pos < 0) {
 132                 ret = -EINVAL;
 133                 goto err;
 134         }
 135
 136         if (pos < sizeof(struct usb_device_descriptor)) {
 137                 struct usb_device_descriptor temp_desc ; /* 18 bytes - fits on the stack */
 138
 139                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 140                 le16_to_cpus(&temp_desc.bcdUSB);
 141                 le16_to_cpus(&temp_desc.idVendor);
 142                 le16_to_cpus(&temp_desc.idProduct);
 143                 le16_to_cpus(&temp_desc.bcdDevice);
 144
 145                 len = sizeof(struct usb_device_descriptor) - pos;
 146                 if (len > nbytes)
 147                         len = nbytes;
 148                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 149                         ret = -EFAULT;
 150                         goto err;
 151                 }
 152
 153                 *ppos += len;
 154                 buf += len;
 155                 nbytes -= len;
 156                 ret += len;
 157         }
 158
 159         pos = sizeof(struct usb_device_descriptor);
 160         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 161                 struct usb_config_descriptor *config =
 162                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 163                 unsigned int length = le16_to_cpu(config->wTotalLength);
 164
 165                 if (*ppos < pos + length) {
 166
 167                         /* The descriptor may claim to be longer than it
 168                          * really is.  Here is the actual allocated length. */
 169                         unsigned alloclen =
 170                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 171
 172                         len = length - (*ppos - pos);
 173                         if (len > nbytes)
 174                                 len = nbytes;
 175
 176                         /* Simply don't write (skip over) unallocated parts */
 177                         if (alloclen > (*ppos - pos)) {
 178                                 alloclen -= (*ppos - pos);
 179                                 if (copy_to_user(buf,
 180                                     dev->rawdescriptors[i] + (*ppos - pos),
 181                                     min(len, alloclen))) {
 182                                         ret = -EFAULT;
 183                                         goto err;
 184                                 }
 185                         }
 186
 187                         *ppos += len;
 188                         buf += len;
 189                         nbytes -= len;
 190                         ret += len;
 191                 }
 192
 193                 pos += length;
 194         }
 195
 196 err:
 197         usb_unlock_device(dev);
 198         return ret;
 199 }
 200
 201 /*
 202  * async list handling
 203  */
 204
 205 static struct async *alloc_async(unsigned int numisoframes)
 206 {
 207         unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor);
 208         struct async *as = kzalloc(assize, GFP_KERNEL);
 209
 210         if (!as)
 211                 return NULL;
 212         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 213         if (!as->urb) {
 214                 kfree(as);
 215                 return NULL;
 216         }
 217         return as;
 218 }
 219
 220 static void free_async(struct async *as)
 221 {
 222         kfree(as->urb->transfer_buffer);
 223         kfree(as->urb->setup_packet);
 224         usb_free_urb(as->urb);
 225         kfree(as);
 226 }
 227
 228 static inline void async_newpending(struct async *as)
 229 {
 230         struct dev_state *ps = as->ps;
 231         unsigned long flags;
 232
 233         spin_lock_irqsave(&ps->lock, flags);
 234         list_add_tail(&as->asynclist, &ps->async_pending);
 235         spin_unlock_irqrestore(&ps->lock, flags);
 236 }
 237
 238 static inline void async_removepending(struct async *as)
 239 {
 240         struct dev_state *ps = as->ps;
 241         unsigned long flags;
 242
 243         spin_lock_irqsave(&ps->lock, flags);
 244         list_del_init(&as->asynclist);
 245         spin_unlock_irqrestore(&ps->lock, flags);
 246 }
 247
 248 static inline struct async *async_getcompleted(struct dev_state *ps)
 249 {
 250         unsigned long flags;
 251         struct async *as = NULL;
 252
 253         spin_lock_irqsave(&ps->lock, flags);
 254         if (!list_empty(&ps->async_completed)) {
 255                 as = list_entry(ps->async_completed.next, struct async, asynclist);
 256                 list_del_init(&as->asynclist);
 257         }
 258         spin_unlock_irqrestore(&ps->lock, flags);
 259         return as;
 260 }
 261
 262 static inline struct async *async_getpending(struct dev_state *ps, void __user *userurb)
 263 {
 264         unsigned long flags;
 265         struct async *as;
 266
 267         spin_lock_irqsave(&ps->lock, flags);
 268         list_for_each_entry(as, &ps->async_pending, asynclist)
 269                 if (as->userurb == userurb) {
 270                         list_del_init(&as->asynclist);
 271                         spin_unlock_irqrestore(&ps->lock, flags);
 272                         return as;
 273                 }
 274         spin_unlock_irqrestore(&ps->lock, flags);
 275         return NULL;
 276 }
 277
 278 static void snoop_urb(struct urb *urb, void __user *userurb)
 279 {
 280         int j;
 281         unsigned char *data = urb->transfer_buffer;
 282
 283         if (!usbfs_snoop)
 284                 return;
 285
 286         if (urb->pipe & USB_DIR_IN)
 287                 dev_info(&urb->dev->dev, "direction=IN\n");
 288         else
 289                 dev_info(&urb->dev->dev, "direction=OUT\n");
 290         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
 291         dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
 292                  urb->transfer_buffer_length);
 293         dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
 294         dev_info(&urb->dev->dev, "data: ");
 295         for (j = 0; j < urb->transfer_buffer_length; ++j)
 296                 printk ("%02x ", data[j]);
 297         printk("\n");
 298 }
 299
 300 static void async_completed(struct urb *urb, struct pt_regs *regs)
 301 {
 302         struct async *as = (struct async *)urb->context;
 303         struct dev_state *ps = as->ps;
 304         struct siginfo sinfo;
 305
 306         spin_lock(&ps->lock);
 307         list_move_tail(&as->asynclist, &ps->async_completed);
 308         spin_unlock(&ps->lock);
 309         if (as->signr) {
 310                 sinfo.si_signo = as->signr;
 311                 sinfo.si_errno = as->urb->status;
 312                 sinfo.si_code = SI_ASYNCIO;
 313                 sinfo.si_addr = as->userurb;
 314                 kill_proc_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
 315                                       as->euid);
 316         }
 317         snoop(&urb->dev->dev, "urb complete\n");
 318         snoop_urb(urb, as->userurb);
 319         wake_up(&ps->wait);
 320 }
 321
 322 static void destroy_async (struct dev_state *ps, struct list_head *list)
 323 {
 324         struct async *as;
 325         unsigned long flags;
 326
 327         spin_lock_irqsave(&ps->lock, flags);
 328         while (!list_empty(list)) {
 329                 as = list_entry(list->next, struct async, asynclist);
 330                 list_del_init(&as->asynclist);
 331
 332                 /* drop the spinlock so the completion handler can run */
 333                 spin_unlock_irqrestore(&ps->lock, flags);
 334                 usb_kill_urb(as->urb);
 335                 spin_lock_irqsave(&ps->lock, flags);
 336         }
 337         spin_unlock_irqrestore(&ps->lock, flags);
 338         as = async_getcompleted(ps);
 339         while (as) {
 340                 free_async(as);
 341                 as = async_getcompleted(ps);
 342         }
 343 }
 344
 345 static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum)
 346 {
 347         struct list_head *p, *q, hitlist;
 348         unsigned long flags;
 349
 350         INIT_LIST_HEAD(&hitlist);
 351         spin_lock_irqsave(&ps->lock, flags);
 352         list_for_each_safe(p, q, &ps->async_pending)
 353                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 354                         list_move_tail(p, &hitlist);
 355         spin_unlock_irqrestore(&ps->lock, flags);
 356         destroy_async(ps, &hitlist);
 357 }
 358
 359 static inline void destroy_all_async(struct dev_state *ps)
 360 {
 361                 destroy_async(ps, &ps->async_pending);
 362 }
 363
 364 /*
 365  * interface claims are made only at the request of user level code,
 366  * which can also release them (explicitly or by closing files).
 367  * they're also undone when devices disconnect.
 368  */
 369
 370 static int driver_probe (struct usb_interface *intf,
 371                          const struct usb_device_id *id)
 372 {
 373         return -ENODEV;
 374 }
 375
 376 static void driver_disconnect(struct usb_interface *intf)
 377 {
 378         struct dev_state *ps = usb_get_intfdata (intf);
 379         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 380
 381         if (!ps)
 382                 return;
 383
 384         /* NOTE:  this relies on usbcore having canceled and completed
 385          * all pending I/O requests; 2.6 does that.
 386          */
 387
 388         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 389                 clear_bit(ifnum, &ps->ifclaimed);
 390         else
 391                 warn("interface number %u out of range", ifnum);
 392
 393         usb_set_intfdata (intf, NULL);
 394
 395         /* force async requests to complete */
 396         destroy_async_on_interface(ps, ifnum);
 397 }
 398
 399 struct usb_driver usbfs_driver = {
 400         .name =         "usbfs",
 401         .probe =        driver_probe,
 402         .disconnect =   driver_disconnect,
 403 };
 404
 405 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 406 {
 407         struct usb_device *dev = ps->dev;
 408         struct usb_interface *intf;
 409         int err;
 410
 411         if (ifnum >= 8*sizeof(ps->ifclaimed))
 412                 return -EINVAL;
 413         /* already claimed */
 414         if (test_bit(ifnum, &ps->ifclaimed))
 415                 return 0;
 416
 417         /* lock against other changes to driver bindings */
 418         down_write(&usb_bus_type.subsys.rwsem);
 419         intf = usb_ifnum_to_if(dev, ifnum);
 420         if (!intf)
 421                 err = -ENOENT;
 422         else
 423                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 424         up_write(&usb_bus_type.subsys.rwsem);
 425         if (err == 0)
 426                 set_bit(ifnum, &ps->ifclaimed);
 427         return err;
 428 }
 429
 430 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 431 {
 432         struct usb_device *dev;
 433         struct usb_interface *intf;
 434         int err;
 435
 436         err = -EINVAL;
 437         if (ifnum >= 8*sizeof(ps->ifclaimed))
 438                 return err;
 439         dev = ps->dev;
 440         /* lock against other changes to driver bindings */
 441         down_write(&usb_bus_type.subsys.rwsem);
 442         intf = usb_ifnum_to_if(dev, ifnum);
 443         if (!intf)
 444                 err = -ENOENT;
 445         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 446                 usb_driver_release_interface(&usbfs_driver, intf);
 447                 err = 0;
 448         }
 449         up_write(&usb_bus_type.subsys.rwsem);
 450         return err;
 451 }
 452
 453 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 454 {
 455         if (ps->dev->state != USB_STATE_CONFIGURED)
 456                 return -EHOSTUNREACH;
 457         if (ifnum >= 8*sizeof(ps->ifclaimed))
 458                 return -EINVAL;
 459         if (test_bit(ifnum, &ps->ifclaimed))
 460                 return 0;
 461         /* if not yet claimed, claim it for the driver */
 462         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n",
 463                current->pid, current->comm, ifnum);
 464         return claimintf(ps, ifnum);
 465 }
 466
 467 static int findintfep(struct usb_device *dev, unsigned int ep)
 468 {
 469         unsigned int i, j, e;
 470         struct usb_interface *intf;
 471         struct usb_host_interface *alts;
 472         struct usb_endpoint_descriptor *endpt;
 473
 474         if (ep & ~(USB_DIR_IN|0xf))
 475                 return -EINVAL;
 476         if (!dev->actconfig)
 477                 return -ESRCH;
 478         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 479                 intf = dev->actconfig->interface[i];
 480                 for (j = 0; j < intf->num_altsetting; j++) {
 481                         alts = &intf->altsetting[j];
 482                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 483                                 endpt = &alts->endpoint[e].desc;
 484                                 if (endpt->bEndpointAddress == ep)
 485                                         return alts->desc.bInterfaceNumber;
 486                         }
 487                 }
 488         }
 489         return -ENOENT;
 490 }
 491
 492 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
 493 {
 494         int ret = 0;
 495
 496         if (ps->dev->state != USB_STATE_ADDRESS
 497          && ps->dev->state != USB_STATE_CONFIGURED)
 498                 return -EHOSTUNREACH;
 499         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 500                 return 0;
 501
 502         index &= 0xff;
 503         switch (requesttype & USB_RECIP_MASK) {
 504         case USB_RECIP_ENDPOINT:
 505                 if ((ret = findintfep(ps->dev, index)) >= 0)
 506                         ret = checkintf(ps, ret);
 507                 break;
 508
 509         case USB_RECIP_INTERFACE:
 510                 ret = checkintf(ps, index);
 511                 break;
 512         }
 513         return ret;
 514 }
 515
 516 static struct usb_device *usbdev_lookup_minor(int minor)
 517 {
 518         struct class_device *class_dev;
 519         struct usb_device *dev = NULL;
 520
 521         down(&usb_device_class->sem);
 522         list_for_each_entry(class_dev, &usb_device_class->children, node) {
 523                 if (class_dev->devt == MKDEV(USB_DEVICE_MAJOR, minor)) {
 524                         dev = class_dev->class_data;
 525                         break;
 526                 }
 527         }
 528         up(&usb_device_class->sem);
 529
 530         return dev;
 531 };
 532
 533 /*
 534  * file operations
 535  */
 536 static int usbdev_open(struct inode *inode, struct file *file)
 537 {
 538         struct usb_device *dev = NULL;
 539         struct dev_state *ps;
 540         int ret;
 541
 542         /*
 543          * no locking necessary here, as chrdev_open has the kernel lock
 544          * (still acquire the kernel lock for safety)
 545          */
 546         ret = -ENOMEM;
 547         if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
 548                 goto out_nolock;
 549
 550         lock_kernel();
 551         ret = -ENOENT;
 552         /* check if we are called from a real node or usbfs */
 553         if (imajor(inode) == USB_DEVICE_MAJOR)
 554                 dev = usbdev_lookup_minor(iminor(inode));
 555         if (!dev)
 556                 dev = inode->u.generic_ip;
 557         if (!dev) {
 558                 kfree(ps);
 559                 goto out;
 560         }
 561         usb_get_dev(dev);
 562         ret = 0;
 563         ps->dev = dev;
 564         ps->file = file;
 565         spin_lock_init(&ps->lock);
 566         INIT_LIST_HEAD(&ps->async_pending);
 567         INIT_LIST_HEAD(&ps->async_completed);
 568         init_waitqueue_head(&ps->wait);
 569         ps->discsignr = 0;
 570         ps->disc_pid = current->pid;
 571         ps->disc_uid = current->uid;
 572         ps->disc_euid = current->euid;
 573         ps->disccontext = NULL;
 574         ps->ifclaimed = 0;
 575         wmb();
 576         list_add_tail(&ps->list, &dev->filelist);
 577         file->private_data = ps;
 578  out:
 579         unlock_kernel();
 580  out_nolock:
 581         return ret;
 582 }
 583
 584 static int usbdev_release(struct inode *inode, struct file *file)
 585 {
 586         struct dev_state *ps = (struct dev_state *)file->private_data;
 587         struct usb_device *dev = ps->dev;
 588         unsigned int ifnum;
 589
 590         usb_lock_device(dev);
 591         list_del_init(&ps->list);
 592         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 593                         ifnum++) {
 594                 if (test_bit(ifnum, &ps->ifclaimed))
 595                         releaseintf(ps, ifnum);
 596         }
 597         destroy_all_async(ps);
 598         usb_unlock_device(dev);
 599         usb_put_dev(dev);
 600         ps->dev = NULL;
 601         kfree(ps);
 602         return 0;
 603 }
 604
 605 static int proc_control(struct dev_state *ps, void __user *arg)
 606 {
 607         struct usb_device *dev = ps->dev;
 608         struct usbdevfs_ctrltransfer ctrl;
 609         unsigned int tmo;
 610         unsigned char *tbuf;
 611         int i, j, ret;
 612
 613         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 614                 return -EFAULT;
 615         if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
 616                 return ret;
 617         if (ctrl.wLength > PAGE_SIZE)
 618                 return -EINVAL;
 619         if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
 620                 return -ENOMEM;
 621         tmo = ctrl.timeout;
 622         if (ctrl.bRequestType & 0x80) {
 623                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
 624                         free_page((unsigned long)tbuf);
 625                         return -EINVAL;
 626                 }
 627                 snoop(&dev->dev, "control read: bRequest=%02x "
 628                                 "bRrequestType=%02x wValue=%04x "
 629                                 "wIndex=%04x wLength=%04x\n",
 630                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 631                                 ctrl.wIndex, ctrl.wLength);
 632
 633                 usb_unlock_device(dev);
 634                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 635                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 636                 usb_lock_device(dev);
 637                 if ((i > 0) && ctrl.wLength) {
 638                         if (usbfs_snoop) {
 639                                 dev_info(&dev->dev, "control read: data ");
 640                                 for (j = 0; j < i; ++j)
 641                                         printk("%02x ", (unsigned char)(tbuf)[j]);
 642                                 printk("\n");
 643                         }
 644                         if (copy_to_user(ctrl.data, tbuf, i)) {
 645                                 free_page((unsigned long)tbuf);
 646                                 return -EFAULT;
 647                         }
 648                 }
 649         } else {
 650                 if (ctrl.wLength) {
 651                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 652                                 free_page((unsigned long)tbuf);
 653                                 return -EFAULT;
 654                         }
 655                 }
 656                 snoop(&dev->dev, "control write: bRequest=%02x "
 657                                 "bRrequestType=%02x wValue=%04x "
 658                                 "wIndex=%04x wLength=%04x\n",
 659                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 660                                 ctrl.wIndex, ctrl.wLength);
 661                 if (usbfs_snoop) {
 662                         dev_info(&dev->dev, "control write: data: ");
 663                         for (j = 0; j < ctrl.wLength; ++j)
 664                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 665                         printk("\n");
 666                 }
 667                 usb_unlock_device(dev);
 668                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 669                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 670                 usb_lock_device(dev);
 671         }
 672         free_page((unsigned long)tbuf);
 673         if (i<0 && i != -EPIPE) {
 674                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 675                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 676                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 677                            ctrl.wLength, i);
 678         }
 679         return i;
 680 }
 681
 682 static int proc_bulk(struct dev_state *ps, void __user *arg)
 683 {
 684         struct usb_device *dev = ps->dev;
 685         struct usbdevfs_bulktransfer bulk;
 686         unsigned int tmo, len1, pipe;
 687         int len2;
 688         unsigned char *tbuf;
 689         int i, j, ret;
 690
 691         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 692                 return -EFAULT;
 693         if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
 694                 return ret;
 695         if ((ret = checkintf(ps, ret)))
 696                 return ret;
 697         if (bulk.ep & USB_DIR_IN)
 698                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 699         else
 700                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 701         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 702                 return -EINVAL;
 703         len1 = bulk.len;
 704         if (len1 > MAX_USBFS_BUFFER_SIZE)
 705                 return -EINVAL;
 706         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 707                 return -ENOMEM;
 708         tmo = bulk.timeout;
 709         if (bulk.ep & 0x80) {
 710                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 711                         kfree(tbuf);
 712                         return -EINVAL;
 713                 }
 714                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
 715                         bulk.len, bulk.timeout);
 716                 usb_unlock_device(dev);
 717                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 718                 usb_lock_device(dev);
 719                 if (!i && len2) {
 720                         if (usbfs_snoop) {
 721                                 dev_info(&dev->dev, "bulk read: data ");
 722                                 for (j = 0; j < len2; ++j)
 723                                         printk("%02x ", (unsigned char)(tbuf)[j]);
 724                                 printk("\n");
 725                         }
 726                         if (copy_to_user(bulk.data, tbuf, len2)) {
 727                                 kfree(tbuf);
 728                                 return -EFAULT;
 729                         }
 730                 }
 731         } else {
 732                 if (len1) {
 733                         if (copy_from_user(tbuf, bulk.data, len1)) {
 734                                 kfree(tbuf);
 735                                 return -EFAULT;
 736                         }
 737                 }
 738                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
 739                         bulk.len, bulk.timeout);
 740                 if (usbfs_snoop) {
 741                         dev_info(&dev->dev, "bulk write: data: ");
 742                         for (j = 0; j < len1; ++j)
 743                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 744                         printk("\n");
 745                 }
 746                 usb_unlock_device(dev);
 747                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 748                 usb_lock_device(dev);
 749         }
 750         kfree(tbuf);
 751         if (i < 0)
 752                 return i;
 753         return len2;
 754 }
 755
 756 static int proc_resetep(struct dev_state *ps, void __user *arg)
 757 {
 758         unsigned int ep;
 759         int ret;
 760
 761         if (get_user(ep, (unsigned int __user *)arg))
 762                 return -EFAULT;
 763         if ((ret = findintfep(ps->dev, ep)) < 0)
 764                 return ret;
 765         if ((ret = checkintf(ps, ret)))
 766                 return ret;
 767         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
 768         return 0;
 769 }
 770
 771 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 772 {
 773         unsigned int ep;
 774         int pipe;
 775         int ret;
 776
 777         if (get_user(ep, (unsigned int __user *)arg))
 778                 return -EFAULT;
 779         if ((ret = findintfep(ps->dev, ep)) < 0)
 780                 return ret;
 781         if ((ret = checkintf(ps, ret)))
 782                 return ret;
 783         if (ep & USB_DIR_IN)
 784                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 785         else
 786                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 787
 788         return usb_clear_halt(ps->dev, pipe);
 789 }
 790
 791
 792 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 793 {
 794         struct usbdevfs_getdriver gd;
 795         struct usb_interface *intf;
 796         int ret;
 797
 798         if (copy_from_user(&gd, arg, sizeof(gd)))
 799                 return -EFAULT;
 800         down_read(&usb_bus_type.subsys.rwsem);
 801         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 802         if (!intf || !intf->dev.driver)
 803                 ret = -ENODATA;
 804         else {
 805                 strncpy(gd.driver, intf->dev.driver->name,
 806                                 sizeof(gd.driver));
 807                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 808         }
 809         up_read(&usb_bus_type.subsys.rwsem);
 810         return ret;
 811 }
 812
 813 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 814 {
 815         struct usbdevfs_connectinfo ci;
 816
 817         ci.devnum = ps->dev->devnum;
 818         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 819         if (copy_to_user(arg, &ci, sizeof(ci)))
 820                 return -EFAULT;
 821         return 0;
 822 }
 823
 824 static int proc_resetdevice(struct dev_state *ps)
 825 {
 826         return usb_reset_device(ps->dev);
 827
 828 }
 829
 830 static int proc_setintf(struct dev_state *ps, void __user *arg)
 831 {
 832         struct usbdevfs_setinterface setintf;
 833         int ret;
 834
 835         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 836                 return -EFAULT;
 837         if ((ret = checkintf(ps, setintf.interface)))
 838                 return ret;
 839         return usb_set_interface(ps->dev, setintf.interface,
 840                         setintf.altsetting);
 841 }
 842
 843 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 844 {
 845         unsigned int u;
 846         int status = 0;
 847         struct usb_host_config *actconfig;
 848
 849         if (get_user(u, (unsigned int __user *)arg))
 850                 return -EFAULT;
 851
 852         actconfig = ps->dev->actconfig;
 853
 854         /* Don't touch the device if any interfaces are claimed.
 855          * It could interfere with other drivers' operations, and if
 856          * an interface is claimed by usbfs it could easily deadlock.
 857          */
 858         if (actconfig) {
 859                 int i;
 860
 861                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 862                         if (usb_interface_claimed(actconfig->interface[i])) {
 863                                 dev_warn (&ps->dev->dev,
 864                                         "usbfs: interface %d claimed by %s "
 865                                         "while '%s' sets config #%d\n",
 866                                         actconfig->interface[i]
 867                                                 ->cur_altsetting
 868                                                 ->desc.bInterfaceNumber,
 869                                         actconfig->interface[i]
 870                                                 ->dev.driver->name,
 871                                         current->comm, u);
 872                                 status = -EBUSY;
 873                                 break;
 874                         }
 875                 }
 876         }
 877
 878         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 879          * so avoid usb_set_configuration()'s kick to sysfs
 880          */
 881         if (status == 0) {
 882                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 883                         status = usb_reset_configuration(ps->dev);
 884                 else
 885                         status = usb_set_configuration(ps->dev, u);
 886         }
 887
 888         return status;
 889 }
 890
 891 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 892                              struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
 893                              void __user *arg)
 894 {
 895         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 896         struct usb_host_endpoint *ep;
 897         struct async *as;
 898         struct usb_ctrlrequest *dr = NULL;
 899         unsigned int u, totlen, isofrmlen;
 900         int ret, interval = 0, ifnum = -1;
 901
 902         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
 903                            URB_NO_FSBR|URB_ZERO_PACKET))
 904                 return -EINVAL;
 905         if (!uurb->buffer)
 906                 return -EINVAL;
 907         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
 908                 return -EINVAL;
 909         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
 910                 if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
 911                         return ifnum;
 912                 if ((ret = checkintf(ps, ifnum)))
 913                         return ret;
 914         }
 915         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0)
 916                 ep = ps->dev->ep_in [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 917         else
 918                 ep = ps->dev->ep_out [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 919         if (!ep)
 920                 return -ENOENT;
 921         switch(uurb->type) {
 922         case USBDEVFS_URB_TYPE_CONTROL:
 923                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 924                                 != USB_ENDPOINT_XFER_CONTROL)
 925                         return -EINVAL;
 926                 /* min 8 byte setup packet, max arbitrary */
 927                 if (uurb->buffer_length < 8 || uurb->buffer_length > PAGE_SIZE)
 928                         return -EINVAL;
 929                 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
 930                         return -ENOMEM;
 931                 if (copy_from_user(dr, uurb->buffer, 8)) {
 932                         kfree(dr);
 933                         return -EFAULT;
 934                 }
 935                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
 936                         kfree(dr);
 937                         return -EINVAL;
 938                 }
 939                 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
 940                         kfree(dr);
 941                         return ret;
 942                 }
 943                 uurb->endpoint = (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK);
 944                 uurb->number_of_packets = 0;
 945                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
 946                 uurb->buffer += 8;
 947                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ?  VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) {
 948                         kfree(dr);
 949                         return -EFAULT;
 950                 }
 951                 snoop(&ps->dev->dev, "control urb\n");
 952                 break;
 953
 954         case USBDEVFS_URB_TYPE_BULK:
 955                 switch (ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 956                 case USB_ENDPOINT_XFER_CONTROL:
 957                 case USB_ENDPOINT_XFER_ISOC:
 958                         return -EINVAL;
 959                 /* allow single-shot interrupt transfers, at bogus rates */
 960                 }
 961                 uurb->number_of_packets = 0;
 962                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
 963                         return -EINVAL;
 964                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
 965                         return -EFAULT;
 966                 snoop(&ps->dev->dev, "bulk urb\n");
 967                 break;
 968
 969         case USBDEVFS_URB_TYPE_ISO:
 970                 /* arbitrary limit */
 971                 if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
 972                         return -EINVAL;
 973                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 974                                 != USB_ENDPOINT_XFER_ISOC)
 975                         return -EINVAL;
 976                 interval = 1 << min (15, ep->desc.bInterval - 1);
 977                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
 978                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
 979                         return -ENOMEM;
 980                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
 981                         kfree(isopkt);
 982                         return -EFAULT;
 983                 }
 984                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
 985                         if (isopkt[u].length > 1023) {
 986                                 kfree(isopkt);
 987                                 return -EINVAL;
 988                         }
 989                         totlen += isopkt[u].length;
 990                 }
 991                 if (totlen > 32768) {
 992                         kfree(isopkt);
 993                         return -EINVAL;
 994                 }
 995                 uurb->buffer_length = totlen;
 996                 snoop(&ps->dev->dev, "iso urb\n");
 997                 break;
 998
 999         case USBDEVFS_URB_TYPE_INTERRUPT:
1000                 uurb->number_of_packets = 0;
1001                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
1002                                 != USB_ENDPOINT_XFER_INT)
1003                         return -EINVAL;
1004                 if (ps->dev->speed == USB_SPEED_HIGH)
1005                         interval = 1 << min (15, ep->desc.bInterval - 1);
1006                 else
1007                         interval = ep->desc.bInterval;
1008                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1009                         return -EINVAL;
1010                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
1011                         return -EFAULT;
1012                 snoop(&ps->dev->dev, "interrupt urb\n");
1013                 break;
1014
1015         default:
1016                 return -EINVAL;
1017         }
1018         if (!(as = alloc_async(uurb->number_of_packets))) {
1019                 kfree(isopkt);
1020                 kfree(dr);
1021                 return -ENOMEM;
1022         }
1023         if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
1024                 kfree(isopkt);
1025                 kfree(dr);
1026                 free_async(as);
1027                 return -ENOMEM;
1028         }
1029         as->urb->dev = ps->dev;
1030         as->urb->pipe = (uurb->type << 30) | __create_pipe(ps->dev, uurb->endpoint & 0xf) | (uurb->endpoint & USB_DIR_IN);
1031         as->urb->transfer_flags = uurb->flags;
1032         as->urb->transfer_buffer_length = uurb->buffer_length;
1033         as->urb->setup_packet = (unsigned char*)dr;
1034         as->urb->start_frame = uurb->start_frame;
1035         as->urb->number_of_packets = uurb->number_of_packets;
1036         as->urb->interval = interval;
1037         as->urb->context = as;
1038         as->urb->complete = async_completed;
1039         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1040                 as->urb->iso_frame_desc[u].offset = totlen;
1041                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1042                 totlen += isopkt[u].length;
1043         }
1044         kfree(isopkt);
1045         as->ps = ps;
1046         as->userurb = arg;
1047         if (uurb->endpoint & USB_DIR_IN)
1048                 as->userbuffer = uurb->buffer;
1049         else
1050                 as->userbuffer = NULL;
1051         as->signr = uurb->signr;
1052         as->ifnum = ifnum;
1053         as->pid = current->pid;
1054         as->uid = current->uid;
1055         as->euid = current->euid;
1056         if (!(uurb->endpoint & USB_DIR_IN)) {
1057                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, as->urb->transfer_buffer_length)) {
1058                         free_async(as);
1059                         return -EFAULT;
1060                 }
1061         }
1062         snoop(&as->urb->dev->dev, "submit urb\n");
1063         snoop_urb(as->urb, as->userurb);
1064         async_newpending(as);
1065         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1066                 dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
1067                 async_removepending(as);
1068                 free_async(as);
1069                 return ret;
1070         }
1071         return 0;
1072 }
1073
1074 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1075 {
1076         struct usbdevfs_urb uurb;
1077
1078         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1079                 return -EFAULT;
1080
1081         return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg);
1082 }
1083
1084 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1085 {
1086         struct async *as;
1087
1088         as = async_getpending(ps, arg);
1089         if (!as)
1090                 return -EINVAL;
1091         usb_kill_urb(as->urb);
1092         return 0;
1093 }
1094
1095 static int processcompl(struct async *as, void __user * __user *arg)
1096 {
1097         struct urb *urb = as->urb;
1098         struct usbdevfs_urb __user *userurb = as->userurb;
1099         void __user *addr = as->userurb;
1100         unsigned int i;
1101
1102         if (as->userbuffer)
1103                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1104                         return -EFAULT;
1105         if (put_user(urb->status, &userurb->status))
1106                 return -EFAULT;
1107         if (put_user(urb->actual_length, &userurb->actual_length))
1108                 return -EFAULT;
1109         if (put_user(urb->error_count, &userurb->error_count))
1110                 return -EFAULT;
1111
1112         if (usb_pipeisoc(urb->pipe)) {
1113                 for (i = 0; i < urb->number_of_packets; i++) {
1114                         if (put_user(urb->iso_frame_desc[i].actual_length,
1115                                      &userurb->iso_frame_desc[i].actual_length))
1116                                 return -EFAULT;
1117                         if (put_user(urb->iso_frame_desc[i].status,
1118                                      &userurb->iso_frame_desc[i].status))
1119                                 return -EFAULT;
1120                 }
1121         }
1122
1123         free_async(as);
1124
1125         if (put_user(addr, (void __user * __user *)arg))
1126                 return -EFAULT;
1127         return 0;
1128 }
1129
1130 static struct async* reap_as(struct dev_state *ps)
1131 {
1132         DECLARE_WAITQUEUE(wait, current);
1133         struct async *as = NULL;
1134         struct usb_device *dev = ps->dev;
1135
1136         add_wait_queue(&ps->wait, &wait);
1137         for (;;) {
1138                 __set_current_state(TASK_INTERRUPTIBLE);
1139                 if ((as = async_getcompleted(ps)))
1140                         break;
1141                 if (signal_pending(current))
1142                         break;
1143                 usb_unlock_device(dev);
1144                 schedule();
1145                 usb_lock_device(dev);
1146         }
1147         remove_wait_queue(&ps->wait, &wait);
1148         set_current_state(TASK_RUNNING);
1149         return as;
1150 }
1151
1152 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1153 {
1154         struct async *as = reap_as(ps);
1155         if (as)
1156                 return processcompl(as, (void __user * __user *)arg);
1157         if (signal_pending(current))
1158                 return -EINTR;
1159         return -EIO;
1160 }
1161
1162 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1163 {
1164         struct async *as;
1165
1166         if (!(as = async_getcompleted(ps)))
1167                 return -EAGAIN;
1168         return processcompl(as, (void __user * __user *)arg);
1169 }
1170
1171 #ifdef CONFIG_COMPAT
1172
1173 static int get_urb32(struct usbdevfs_urb *kurb,
1174                      struct usbdevfs_urb32 __user *uurb)
1175 {
1176         __u32  uptr;
1177         if (get_user(kurb->type, &uurb->type) ||
1178             __get_user(kurb->endpoint, &uurb->endpoint) ||
1179             __get_user(kurb->status, &uurb->status) ||
1180             __get_user(kurb->flags, &uurb->flags) ||
1181             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1182             __get_user(kurb->actual_length, &uurb->actual_length) ||
1183             __get_user(kurb->start_frame, &uurb->start_frame) ||
1184             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1185             __get_user(kurb->error_count, &uurb->error_count) ||
1186             __get_user(kurb->signr, &uurb->signr))
1187                 return -EFAULT;
1188
1189         if (__get_user(uptr, &uurb->buffer))
1190                 return -EFAULT;
1191         kurb->buffer = compat_ptr(uptr);
1192         if (__get_user(uptr, &uurb->buffer))
1193                 return -EFAULT;
1194         kurb->usercontext = compat_ptr(uptr);
1195
1196         return 0;
1197 }
1198
1199 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1200 {
1201         struct usbdevfs_urb uurb;
1202
1203         if (get_urb32(&uurb,(struct usbdevfs_urb32 *)arg))
1204                 return -EFAULT;
1205
1206         return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg);
1207 }
1208
1209 static int processcompl_compat(struct async *as, void __user * __user *arg)
1210 {
1211         struct urb *urb = as->urb;
1212         struct usbdevfs_urb32 __user *userurb = as->userurb;
1213         void __user *addr = as->userurb;
1214         unsigned int i;
1215
1216         if (as->userbuffer)
1217                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1218                         return -EFAULT;
1219         if (put_user(urb->status, &userurb->status))
1220                 return -EFAULT;
1221         if (put_user(urb->actual_length, &userurb->actual_length))
1222                 return -EFAULT;
1223         if (put_user(urb->error_count, &userurb->error_count))
1224                 return -EFAULT;
1225
1226         if (usb_pipeisoc(urb->pipe)) {
1227                 for (i = 0; i < urb->number_of_packets; i++) {
1228                         if (put_user(urb->iso_frame_desc[i].actual_length,
1229                                      &userurb->iso_frame_desc[i].actual_length))
1230                                 return -EFAULT;
1231                         if (put_user(urb->iso_frame_desc[i].status,
1232                                      &userurb->iso_frame_desc[i].status))
1233                                 return -EFAULT;
1234                 }
1235         }
1236
1237         free_async(as);
1238         if (put_user((u32)(u64)addr, (u32 __user *)arg))
1239                 return -EFAULT;
1240         return 0;
1241 }
1242
1243 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1244 {
1245         struct async *as = reap_as(ps);
1246         if (as)
1247                 return processcompl_compat(as, (void __user * __user *)arg);
1248         if (signal_pending(current))
1249                 return -EINTR;
1250         return -EIO;
1251 }
1252
1253 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1254 {
1255         struct async *as;
1256
1257         if (!(as = async_getcompleted(ps)))
1258                 return -EAGAIN;
1259         return processcompl_compat(as, (void __user * __user *)arg);
1260 }
1261
1262 #endif
1263
1264 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1265 {
1266         struct usbdevfs_disconnectsignal ds;
1267
1268         if (copy_from_user(&ds, arg, sizeof(ds)))
1269                 return -EFAULT;
1270         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1271                 return -EINVAL;
1272         ps->discsignr = ds.signr;
1273         ps->disccontext = ds.context;
1274         return 0;
1275 }
1276
1277 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1278 {
1279         unsigned int ifnum;
1280
1281         if (get_user(ifnum, (unsigned int __user *)arg))
1282                 return -EFAULT;
1283         return claimintf(ps, ifnum);
1284 }
1285
1286 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1287 {
1288         unsigned int ifnum;
1289         int ret;
1290
1291         if (get_user(ifnum, (unsigned int __user *)arg))
1292                 return -EFAULT;
1293         if ((ret = releaseintf(ps, ifnum)) < 0)
1294                 return ret;
1295         destroy_async_on_interface (ps, ifnum);
1296         return 0;
1297 }
1298
1299 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1300 {
1301         int                     size;
1302         void                    *buf = NULL;
1303         int                     retval = 0;
1304         struct usb_interface    *intf = NULL;
1305         struct usb_driver       *driver = NULL;
1306
1307         /* alloc buffer */
1308         if ((size = _IOC_SIZE (ctl->ioctl_code)) > 0) {
1309                 if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
1310                         return -ENOMEM;
1311                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1312                         if (copy_from_user (buf, ctl->data, size)) {
1313                                 kfree(buf);
1314                                 return -EFAULT;
1315                         }
1316                 } else {
1317                         memset (buf, 0, size);
1318                 }
1319         }
1320
1321         if (!connected(ps->dev)) {
1322                 kfree(buf);
1323                 return -ENODEV;
1324         }
1325
1326         if (ps->dev->state != USB_STATE_CONFIGURED)
1327                 retval = -EHOSTUNREACH;
1328         else if (!(intf = usb_ifnum_to_if (ps->dev, ctl->ifno)))
1329                retval = -EINVAL;
1330         else switch (ctl->ioctl_code) {
1331
1332         /* disconnect kernel driver from interface */
1333         case USBDEVFS_DISCONNECT:
1334
1335                 down_write(&usb_bus_type.subsys.rwsem);
1336                 if (intf->dev.driver) {
1337                         driver = to_usb_driver(intf->dev.driver);
1338                         dev_dbg (&intf->dev, "disconnect by usbfs\n");
1339                         usb_driver_release_interface(driver, intf);
1340                 } else
1341                         retval = -ENODATA;
1342                 up_write(&usb_bus_type.subsys.rwsem);
1343                 break;
1344
1345         /* let kernel drivers try to (re)bind to the interface */
1346         case USBDEVFS_CONNECT:
1347                 usb_unlock_device(ps->dev);
1348                 bus_rescan_devices(intf->dev.bus);
1349                 usb_lock_device(ps->dev);
1350                 break;
1351
1352         /* talk directly to the interface's driver */
1353         default:
1354                 down_read(&usb_bus_type.subsys.rwsem);
1355                 if (intf->dev.driver)
1356                         driver = to_usb_driver(intf->dev.driver);
1357                 if (driver == NULL || driver->ioctl == NULL) {
1358                         retval = -ENOTTY;
1359                 } else {
1360                         retval = driver->ioctl (intf, ctl->ioctl_code, buf);
1361                         if (retval == -ENOIOCTLCMD)
1362                                 retval = -ENOTTY;
1363                 }
1364                 up_read(&usb_bus_type.subsys.rwsem);
1365         }
1366
1367         /* cleanup and return */
1368         if (retval >= 0
1369                         && (_IOC_DIR (ctl->ioctl_code) & _IOC_READ) != 0
1370                         && size > 0
1371                         && copy_to_user (ctl->data, buf, size) != 0)
1372                 retval = -EFAULT;
1373
1374         kfree(buf);
1375         return retval;
1376 }
1377
1378 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1379 {
1380         struct usbdevfs_ioctl   ctrl;
1381
1382         if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
1383                 return -EFAULT;
1384         return proc_ioctl(ps, &ctrl);
1385 }
1386
1387 #ifdef CONFIG_COMPAT
1388 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1389 {
1390         struct usbdevfs_ioctl32 __user *uioc;
1391         struct usbdevfs_ioctl ctrl;
1392         u32 udata;
1393
1394         uioc = compat_ptr((long)arg);
1395         if (get_user(ctrl.ifno, &uioc->ifno) ||
1396             get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1397             __get_user(udata, &uioc->data))
1398                 return -EFAULT;
1399         ctrl.data = compat_ptr(udata);
1400
1401         return proc_ioctl(ps, &ctrl);
1402 }
1403 #endif
1404
1405 /*
1406  * NOTE:  All requests here that have interface numbers as parameters
1407  * are assuming that somehow the configuration has been prevented from
1408  * changing.  But there's no mechanism to ensure that...
1409  */
1410 static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1411 {
1412         struct dev_state *ps = (struct dev_state *)file->private_data;
1413         struct usb_device *dev = ps->dev;
1414         void __user *p = (void __user *)arg;
1415         int ret = -ENOTTY;
1416
1417         if (!(file->f_mode & FMODE_WRITE))
1418                 return -EPERM;
1419         usb_lock_device(dev);
1420         if (!connected(dev)) {
1421                 usb_unlock_device(dev);
1422                 return -ENODEV;
1423         }
1424
1425         switch (cmd) {
1426         case USBDEVFS_CONTROL:
1427                 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
1428                 ret = proc_control(ps, p);
1429                 if (ret >= 0)
1430                         inode->i_mtime = CURRENT_TIME;
1431                 break;
1432
1433         case USBDEVFS_BULK:
1434                 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
1435                 ret = proc_bulk(ps, p);
1436                 if (ret >= 0)
1437                         inode->i_mtime = CURRENT_TIME;
1438                 break;
1439
1440         case USBDEVFS_RESETEP:
1441                 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
1442                 ret = proc_resetep(ps, p);
1443                 if (ret >= 0)
1444                         inode->i_mtime = CURRENT_TIME;
1445                 break;
1446
1447         case USBDEVFS_RESET:
1448                 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
1449                 ret = proc_resetdevice(ps);
1450                 break;
1451
1452         case USBDEVFS_CLEAR_HALT:
1453                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
1454                 ret = proc_clearhalt(ps, p);
1455                 if (ret >= 0)
1456                         inode->i_mtime = CURRENT_TIME;
1457                 break;
1458
1459         case USBDEVFS_GETDRIVER:
1460                 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
1461                 ret = proc_getdriver(ps, p);
1462                 break;
1463
1464         case USBDEVFS_CONNECTINFO:
1465                 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
1466                 ret = proc_connectinfo(ps, p);
1467                 break;
1468
1469         case USBDEVFS_SETINTERFACE:
1470                 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
1471                 ret = proc_setintf(ps, p);
1472                 break;
1473
1474         case USBDEVFS_SETCONFIGURATION:
1475                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
1476                 ret = proc_setconfig(ps, p);
1477                 break;
1478
1479         case USBDEVFS_SUBMITURB:
1480                 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
1481                 ret = proc_submiturb(ps, p);
1482                 if (ret >= 0)
1483                         inode->i_mtime = CURRENT_TIME;
1484                 break;
1485
1486 #ifdef CONFIG_COMPAT
1487
1488         case USBDEVFS_SUBMITURB32:
1489                 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
1490                 ret = proc_submiturb_compat(ps, p);
1491                 if (ret >= 0)
1492                         inode->i_mtime = CURRENT_TIME;
1493                 break;
1494
1495         case USBDEVFS_REAPURB32:
1496                 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
1497                 ret = proc_reapurb_compat(ps, p);
1498                 break;
1499
1500         case USBDEVFS_REAPURBNDELAY32:
1501                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
1502                 ret = proc_reapurbnonblock_compat(ps, p);
1503                 break;
1504
1505         case USBDEVFS_IOCTL32:
1506                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1507                 ret = proc_ioctl_compat(ps, (compat_uptr_t)(long)p);
1508                 break;
1509 #endif
1510
1511         case USBDEVFS_DISCARDURB:
1512                 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
1513                 ret = proc_unlinkurb(ps, p);
1514                 break;
1515
1516         case USBDEVFS_REAPURB:
1517                 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
1518                 ret = proc_reapurb(ps, p);
1519                 break;
1520
1521         case USBDEVFS_REAPURBNDELAY:
1522                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
1523                 ret = proc_reapurbnonblock(ps, p);
1524                 break;
1525
1526         case USBDEVFS_DISCSIGNAL:
1527                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
1528                 ret = proc_disconnectsignal(ps, p);
1529                 break;
1530
1531         case USBDEVFS_CLAIMINTERFACE:
1532                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
1533                 ret = proc_claiminterface(ps, p);
1534                 break;
1535
1536         case USBDEVFS_RELEASEINTERFACE:
1537                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
1538                 ret = proc_releaseinterface(ps, p);
1539                 break;
1540
1541         case USBDEVFS_IOCTL:
1542                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1543                 ret = proc_ioctl_default(ps, p);
1544                 break;
1545         }
1546         usb_unlock_device(dev);
1547         if (ret >= 0)
1548                 inode->i_atime = CURRENT_TIME;
1549         return ret;
1550 }
1551
1552 /* No kernel lock - fine */
1553 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
1554 {
1555         struct dev_state *ps = (struct dev_state *)file->private_data;
1556         unsigned int mask = 0;
1557
1558         poll_wait(file, &ps->wait, wait);
1559         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1560                 mask |= POLLOUT | POLLWRNORM;
1561         if (!connected(ps->dev))
1562                 mask |= POLLERR | POLLHUP;
1563         return mask;
1564 }
1565
1566 struct file_operations usbfs_device_file_operations = {
1567         .llseek =       usbdev_lseek,
1568         .read =         usbdev_read,
1569         .poll =         usbdev_poll,
1570         .ioctl =        usbdev_ioctl,
1571         .open =         usbdev_open,
1572         .release =      usbdev_release,
1573 };
1574
1575 static void usbdev_add(struct usb_device *dev)
1576 {
1577         int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1578
1579         dev->class_dev = class_device_create(usb_device_class, NULL,
1580                                 MKDEV(USB_DEVICE_MAJOR, minor), &dev->dev,
1581                                 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1582
1583         dev->class_dev->class_data = dev;
1584 }
1585
1586 static void usbdev_remove(struct usb_device *dev)
1587 {
1588         class_device_unregister(dev->class_dev);
1589 }
1590
1591 static int usbdev_notify(struct notifier_block *self, unsigned long action,
1592                          void *dev)
1593 {
1594         switch (action) {
1595         case USB_DEVICE_ADD:
1596                 usbdev_add(dev);
1597                 break;
1598         case USB_DEVICE_REMOVE:
1599                 usbdev_remove(dev);
1600                 break;
1601         }
1602         return NOTIFY_OK;
1603 }
1604
1605 static struct notifier_block usbdev_nb = {
1606         .notifier_call =        usbdev_notify,
1607 };
1608
1609 static struct cdev usb_device_cdev = {
1610         .kobj   = {.name = "usb_device", },
1611         .owner  = THIS_MODULE,
1612 };
1613
1614 int __init usbdev_init(void)
1615 {
1616         int retval;
1617
1618         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1619                         "usb_device");
1620         if (retval) {
1621                 err("unable to register minors for usb_device");
1622                 goto out;
1623         }
1624         cdev_init(&usb_device_cdev, &usbfs_device_file_operations);
1625         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1626         if (retval) {
1627                 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1628                 goto error_cdev;
1629         }
1630         usb_device_class = class_create(THIS_MODULE, "usb_device");
1631         if (IS_ERR(usb_device_class)) {
1632                 err("unable to register usb_device class");
1633                 retval = PTR_ERR(usb_device_class);
1634                 goto error_class;
1635         }
1636
1637         usb_register_notify(&usbdev_nb);
1638
1639 out:
1640         return retval;
1641
1642 error_class:
1643         usb_device_class = NULL;
1644         cdev_del(&usb_device_cdev);
1645
1646 error_cdev:
1647         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1648         goto out;
1649 }
1650
1651 void usbdev_cleanup(void)
1652 {
1653         usb_unregister_notify(&usbdev_nb);
1654         class_destroy(usb_device_class);
1655         cdev_del(&usb_device_cdev);
1656         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1657 }
1658