drivers/usb/core/devio.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *      devio.c  --  User space communication with USB devices.
   5  *
   6  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   7  *
   8  *      This program is free software; you can redistribute it and/or modify
   9  *      it under the terms of the GNU General Public License as published by
  10  *      the Free Software Foundation; either version 2 of the License, or
  11  *      (at your option) any later version.
  12  *
  13  *      This program is distributed in the hope that it will be useful,
  14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *      GNU General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License
  19  *      along with this program; if not, write to the Free Software
  20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  *  $Id: devio.c,v 1.7 2000/02/01 17:28:48 fliegl Exp $
  23  *
  24  *  This file implements the usbfs/x/y files, where
  25  *  x is the bus number and y the device number.
  26  *
  27  *  It allows user space programs/"drivers" to communicate directly
  28  *  with USB devices without intervening kernel driver.
  29  *
  30  *  Revision history
  31  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  32  *    04.01.2000   0.2   Turned into its own filesystem
  33  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  34  *                       (CAN-2005-3055)
  35  */
  36
  37 /*****************************************************************************/
  38
  39 #include <linux/fs.h>
  40 #include <linux/mm.h>
  41 #include <linux/slab.h>
  42 #include <linux/smp_lock.h>
  43 #include <linux/signal.h>
  44 #include <linux/poll.h>
  45 #include <linux/module.h>
  46 #include <linux/usb.h>
  47 #include <linux/usbdevice_fs.h>
  48 #include <linux/cdev.h>
  49 #include <linux/notifier.h>
  50 #include <linux/security.h>
  51 #include <asm/uaccess.h>
  52 #include <asm/byteorder.h>
  53 #include <linux/moduleparam.h>
  54
  55 #include "hcd.h"        /* for usbcore internals */
  56 #include "usb.h"
  57
  58 #define USB_MAXBUS                      64
  59 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
  60 static struct class *usb_device_class;
  61
  62 /* Mutual exclusion for removal, open, and release */
  63 DEFINE_MUTEX(usbfs_mutex);
  64
  65 struct async {
  66         struct list_head asynclist;
  67         struct dev_state *ps;
  68         pid_t pid;
  69         uid_t uid, euid;
  70         unsigned int signr;
  71         unsigned int ifnum;
  72         void __user *userbuffer;
  73         void __user *userurb;
  74         struct urb *urb;
  75         u32 secid;
  76 };
  77
  78 static int usbfs_snoop = 0;
  79 module_param (usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  80 MODULE_PARM_DESC (usbfs_snoop, "true to log all usbfs traffic");
  81
  82 #define snoop(dev, format, arg...)                              \
  83         do {                                                    \
  84                 if (usbfs_snoop)                                \
  85                         dev_info( dev , format , ## arg);       \
  86         } while (0)
  87
  88 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
  89
  90
  91 #define MAX_USBFS_BUFFER_SIZE   16384
  92
  93 static inline int connected (struct usb_device *dev)
  94 {
  95         return dev->state != USB_STATE_NOTATTACHED;
  96 }
  97
  98 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
  99 {
 100         loff_t ret;
 101
 102         lock_kernel();
 103
 104         switch (orig) {
 105         case 0:
 106                 file->f_pos = offset;
 107                 ret = file->f_pos;
 108                 break;
 109         case 1:
 110                 file->f_pos += offset;
 111                 ret = file->f_pos;
 112                 break;
 113         case 2:
 114         default:
 115                 ret = -EINVAL;
 116         }
 117
 118         unlock_kernel();
 119         return ret;
 120 }
 121
 122 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
 123 {
 124         struct dev_state *ps = (struct dev_state *)file->private_data;
 125         struct usb_device *dev = ps->dev;
 126         ssize_t ret = 0;
 127         unsigned len;
 128         loff_t pos;
 129         int i;
 130
 131         pos = *ppos;
 132         usb_lock_device(dev);
 133         if (!connected(dev)) {
 134                 ret = -ENODEV;
 135                 goto err;
 136         } else if (pos < 0) {
 137                 ret = -EINVAL;
 138                 goto err;
 139         }
 140
 141         if (pos < sizeof(struct usb_device_descriptor)) {
 142                 struct usb_device_descriptor temp_desc ; /* 18 bytes - fits on the stack */
 143
 144                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 145                 le16_to_cpus(&temp_desc.bcdUSB);
 146                 le16_to_cpus(&temp_desc.idVendor);
 147                 le16_to_cpus(&temp_desc.idProduct);
 148                 le16_to_cpus(&temp_desc.bcdDevice);
 149
 150                 len = sizeof(struct usb_device_descriptor) - pos;
 151                 if (len > nbytes)
 152                         len = nbytes;
 153                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 154                         ret = -EFAULT;
 155                         goto err;
 156                 }
 157
 158                 *ppos += len;
 159                 buf += len;
 160                 nbytes -= len;
 161                 ret += len;
 162         }
 163
 164         pos = sizeof(struct usb_device_descriptor);
 165         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 166                 struct usb_config_descriptor *config =
 167                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 168                 unsigned int length = le16_to_cpu(config->wTotalLength);
 169
 170                 if (*ppos < pos + length) {
 171
 172                         /* The descriptor may claim to be longer than it
 173                          * really is.  Here is the actual allocated length. */
 174                         unsigned alloclen =
 175                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 176
 177                         len = length - (*ppos - pos);
 178                         if (len > nbytes)
 179                                 len = nbytes;
 180
 181                         /* Simply don't write (skip over) unallocated parts */
 182                         if (alloclen > (*ppos - pos)) {
 183                                 alloclen -= (*ppos - pos);
 184                                 if (copy_to_user(buf,
 185                                     dev->rawdescriptors[i] + (*ppos - pos),
 186                                     min(len, alloclen))) {
 187                                         ret = -EFAULT;
 188                                         goto err;
 189                                 }
 190                         }
 191
 192                         *ppos += len;
 193                         buf += len;
 194                         nbytes -= len;
 195                         ret += len;
 196                 }
 197
 198                 pos += length;
 199         }
 200
 201 err:
 202         usb_unlock_device(dev);
 203         return ret;
 204 }
 205
 206 /*
 207  * async list handling
 208  */
 209
 210 static struct async *alloc_async(unsigned int numisoframes)
 211 {
 212         unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor);
 213         struct async *as = kzalloc(assize, GFP_KERNEL);
 214
 215         if (!as)
 216                 return NULL;
 217         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 218         if (!as->urb) {
 219                 kfree(as);
 220                 return NULL;
 221         }
 222         return as;
 223 }
 224
 225 static void free_async(struct async *as)
 226 {
 227         kfree(as->urb->transfer_buffer);
 228         kfree(as->urb->setup_packet);
 229         usb_free_urb(as->urb);
 230         kfree(as);
 231 }
 232
 233 static inline void async_newpending(struct async *as)
 234 {
 235         struct dev_state *ps = as->ps;
 236         unsigned long flags;
 237
 238         spin_lock_irqsave(&ps->lock, flags);
 239         list_add_tail(&as->asynclist, &ps->async_pending);
 240         spin_unlock_irqrestore(&ps->lock, flags);
 241 }
 242
 243 static inline void async_removepending(struct async *as)
 244 {
 245         struct dev_state *ps = as->ps;
 246         unsigned long flags;
 247
 248         spin_lock_irqsave(&ps->lock, flags);
 249         list_del_init(&as->asynclist);
 250         spin_unlock_irqrestore(&ps->lock, flags);
 251 }
 252
 253 static inline struct async *async_getcompleted(struct dev_state *ps)
 254 {
 255         unsigned long flags;
 256         struct async *as = NULL;
 257
 258         spin_lock_irqsave(&ps->lock, flags);
 259         if (!list_empty(&ps->async_completed)) {
 260                 as = list_entry(ps->async_completed.next, struct async, asynclist);
 261                 list_del_init(&as->asynclist);
 262         }
 263         spin_unlock_irqrestore(&ps->lock, flags);
 264         return as;
 265 }
 266
 267 static inline struct async *async_getpending(struct dev_state *ps, void __user *userurb)
 268 {
 269         unsigned long flags;
 270         struct async *as;
 271
 272         spin_lock_irqsave(&ps->lock, flags);
 273         list_for_each_entry(as, &ps->async_pending, asynclist)
 274                 if (as->userurb == userurb) {
 275                         list_del_init(&as->asynclist);
 276                         spin_unlock_irqrestore(&ps->lock, flags);
 277                         return as;
 278                 }
 279         spin_unlock_irqrestore(&ps->lock, flags);
 280         return NULL;
 281 }
 282
 283 static void snoop_urb(struct urb *urb, void __user *userurb)
 284 {
 285         int j;
 286         unsigned char *data = urb->transfer_buffer;
 287
 288         if (!usbfs_snoop)
 289                 return;
 290
 291         if (urb->pipe & USB_DIR_IN)
 292                 dev_info(&urb->dev->dev, "direction=IN\n");
 293         else
 294                 dev_info(&urb->dev->dev, "direction=OUT\n");
 295         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
 296         dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
 297                  urb->transfer_buffer_length);
 298         dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
 299         dev_info(&urb->dev->dev, "data: ");
 300         for (j = 0; j < urb->transfer_buffer_length; ++j)
 301                 printk ("%02x ", data[j]);
 302         printk("\n");
 303 }
 304
 305 static void async_completed(struct urb *urb, struct pt_regs *regs)
 306 {
 307         struct async *as = (struct async *)urb->context;
 308         struct dev_state *ps = as->ps;
 309         struct siginfo sinfo;
 310
 311         spin_lock(&ps->lock);
 312         list_move_tail(&as->asynclist, &ps->async_completed);
 313         spin_unlock(&ps->lock);
 314         if (as->signr) {
 315                 sinfo.si_signo = as->signr;
 316                 sinfo.si_errno = as->urb->status;
 317                 sinfo.si_code = SI_ASYNCIO;
 318                 sinfo.si_addr = as->userurb;
 319                 kill_proc_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
 320                                       as->euid, as->secid);
 321         }
 322         snoop(&urb->dev->dev, "urb complete\n");
 323         snoop_urb(urb, as->userurb);
 324         wake_up(&ps->wait);
 325 }
 326
 327 static void destroy_async (struct dev_state *ps, struct list_head *list)
 328 {
 329         struct async *as;
 330         unsigned long flags;
 331
 332         spin_lock_irqsave(&ps->lock, flags);
 333         while (!list_empty(list)) {
 334                 as = list_entry(list->next, struct async, asynclist);
 335                 list_del_init(&as->asynclist);
 336
 337                 /* drop the spinlock so the completion handler can run */
 338                 spin_unlock_irqrestore(&ps->lock, flags);
 339                 usb_kill_urb(as->urb);
 340                 spin_lock_irqsave(&ps->lock, flags);
 341         }
 342         spin_unlock_irqrestore(&ps->lock, flags);
 343         as = async_getcompleted(ps);
 344         while (as) {
 345                 free_async(as);
 346                 as = async_getcompleted(ps);
 347         }
 348 }
 349
 350 static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum)
 351 {
 352         struct list_head *p, *q, hitlist;
 353         unsigned long flags;
 354
 355         INIT_LIST_HEAD(&hitlist);
 356         spin_lock_irqsave(&ps->lock, flags);
 357         list_for_each_safe(p, q, &ps->async_pending)
 358                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 359                         list_move_tail(p, &hitlist);
 360         spin_unlock_irqrestore(&ps->lock, flags);
 361         destroy_async(ps, &hitlist);
 362 }
 363
 364 static inline void destroy_all_async(struct dev_state *ps)
 365 {
 366                 destroy_async(ps, &ps->async_pending);
 367 }
 368
 369 /*
 370  * interface claims are made only at the request of user level code,
 371  * which can also release them (explicitly or by closing files).
 372  * they're also undone when devices disconnect.
 373  */
 374
 375 static int driver_probe (struct usb_interface *intf,
 376                          const struct usb_device_id *id)
 377 {
 378         return -ENODEV;
 379 }
 380
 381 static void driver_disconnect(struct usb_interface *intf)
 382 {
 383         struct dev_state *ps = usb_get_intfdata (intf);
 384         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 385
 386         if (!ps)
 387                 return;
 388
 389         /* NOTE:  this relies on usbcore having canceled and completed
 390          * all pending I/O requests; 2.6 does that.
 391          */
 392
 393         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 394                 clear_bit(ifnum, &ps->ifclaimed);
 395         else
 396                 warn("interface number %u out of range", ifnum);
 397
 398         usb_set_intfdata (intf, NULL);
 399
 400         /* force async requests to complete */
 401         destroy_async_on_interface(ps, ifnum);
 402 }
 403
 404 struct usb_driver usbfs_driver = {
 405         .name =         "usbfs",
 406         .probe =        driver_probe,
 407         .disconnect =   driver_disconnect,
 408 };
 409
 410 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 411 {
 412         struct usb_device *dev = ps->dev;
 413         struct usb_interface *intf;
 414         int err;
 415
 416         if (ifnum >= 8*sizeof(ps->ifclaimed))
 417                 return -EINVAL;
 418         /* already claimed */
 419         if (test_bit(ifnum, &ps->ifclaimed))
 420                 return 0;
 421
 422         /* lock against other changes to driver bindings */
 423         down_write(&usb_bus_type.subsys.rwsem);
 424         intf = usb_ifnum_to_if(dev, ifnum);
 425         if (!intf)
 426                 err = -ENOENT;
 427         else
 428                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 429         up_write(&usb_bus_type.subsys.rwsem);
 430         if (err == 0)
 431                 set_bit(ifnum, &ps->ifclaimed);
 432         return err;
 433 }
 434
 435 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 436 {
 437         struct usb_device *dev;
 438         struct usb_interface *intf;
 439         int err;
 440
 441         err = -EINVAL;
 442         if (ifnum >= 8*sizeof(ps->ifclaimed))
 443                 return err;
 444         dev = ps->dev;
 445         /* lock against other changes to driver bindings */
 446         down_write(&usb_bus_type.subsys.rwsem);
 447         intf = usb_ifnum_to_if(dev, ifnum);
 448         if (!intf)
 449                 err = -ENOENT;
 450         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 451                 usb_driver_release_interface(&usbfs_driver, intf);
 452                 err = 0;
 453         }
 454         up_write(&usb_bus_type.subsys.rwsem);
 455         return err;
 456 }
 457
 458 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 459 {
 460         if (ps->dev->state != USB_STATE_CONFIGURED)
 461                 return -EHOSTUNREACH;
 462         if (ifnum >= 8*sizeof(ps->ifclaimed))
 463                 return -EINVAL;
 464         if (test_bit(ifnum, &ps->ifclaimed))
 465                 return 0;
 466         /* if not yet claimed, claim it for the driver */
 467         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n",
 468                current->pid, current->comm, ifnum);
 469         return claimintf(ps, ifnum);
 470 }
 471
 472 static int findintfep(struct usb_device *dev, unsigned int ep)
 473 {
 474         unsigned int i, j, e;
 475         struct usb_interface *intf;
 476         struct usb_host_interface *alts;
 477         struct usb_endpoint_descriptor *endpt;
 478
 479         if (ep & ~(USB_DIR_IN|0xf))
 480                 return -EINVAL;
 481         if (!dev->actconfig)
 482                 return -ESRCH;
 483         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 484                 intf = dev->actconfig->interface[i];
 485                 for (j = 0; j < intf->num_altsetting; j++) {
 486                         alts = &intf->altsetting[j];
 487                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 488                                 endpt = &alts->endpoint[e].desc;
 489                                 if (endpt->bEndpointAddress == ep)
 490                                         return alts->desc.bInterfaceNumber;
 491                         }
 492                 }
 493         }
 494         return -ENOENT;
 495 }
 496
 497 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
 498 {
 499         int ret = 0;
 500
 501         if (ps->dev->state != USB_STATE_ADDRESS
 502          && ps->dev->state != USB_STATE_CONFIGURED)
 503                 return -EHOSTUNREACH;
 504         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 505                 return 0;
 506
 507         index &= 0xff;
 508         switch (requesttype & USB_RECIP_MASK) {
 509         case USB_RECIP_ENDPOINT:
 510                 if ((ret = findintfep(ps->dev, index)) >= 0)
 511                         ret = checkintf(ps, ret);
 512                 break;
 513
 514         case USB_RECIP_INTERFACE:
 515                 ret = checkintf(ps, index);
 516                 break;
 517         }
 518         return ret;
 519 }
 520
 521 static struct usb_device *usbdev_lookup_minor(int minor)
 522 {
 523         struct class_device *class_dev;
 524         struct usb_device *dev = NULL;
 525
 526         down(&usb_device_class->sem);
 527         list_for_each_entry(class_dev, &usb_device_class->children, node) {
 528                 if (class_dev->devt == MKDEV(USB_DEVICE_MAJOR, minor)) {
 529                         dev = class_dev->class_data;
 530                         break;
 531                 }
 532         }
 533         up(&usb_device_class->sem);
 534
 535         return dev;
 536 };
 537
 538 /*
 539  * file operations
 540  */
 541 static int usbdev_open(struct inode *inode, struct file *file)
 542 {
 543         struct usb_device *dev = NULL;
 544         struct dev_state *ps;
 545         int ret;
 546
 547         /* Protect against simultaneous removal or release */
 548         mutex_lock(&usbfs_mutex);
 549
 550         ret = -ENOMEM;
 551         if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
 552                 goto out;
 553
 554         ret = -ENOENT;
 555         /* check if we are called from a real node or usbfs */
 556         if (imajor(inode) == USB_DEVICE_MAJOR)
 557                 dev = usbdev_lookup_minor(iminor(inode));
 558         if (!dev)
 559                 dev = inode->i_private;
 560         if (!dev) {
 561                 kfree(ps);
 562                 goto out;
 563         }
 564         usb_get_dev(dev);
 565         ret = 0;
 566         ps->dev = dev;
 567         ps->file = file;
 568         spin_lock_init(&ps->lock);
 569         INIT_LIST_HEAD(&ps->async_pending);
 570         INIT_LIST_HEAD(&ps->async_completed);
 571         init_waitqueue_head(&ps->wait);
 572         ps->discsignr = 0;
 573         ps->disc_pid = current->pid;
 574         ps->disc_uid = current->uid;
 575         ps->disc_euid = current->euid;
 576         ps->disccontext = NULL;
 577         ps->ifclaimed = 0;
 578         security_task_getsecid(current, &ps->secid);
 579         wmb();
 580         list_add_tail(&ps->list, &dev->filelist);
 581         file->private_data = ps;
 582  out:
 583         mutex_unlock(&usbfs_mutex);
 584         return ret;
 585 }
 586
 587 static int usbdev_release(struct inode *inode, struct file *file)
 588 {
 589         struct dev_state *ps = (struct dev_state *)file->private_data;
 590         struct usb_device *dev = ps->dev;
 591         unsigned int ifnum;
 592
 593         usb_lock_device(dev);
 594
 595         /* Protect against simultaneous open */
 596         mutex_lock(&usbfs_mutex);
 597         list_del_init(&ps->list);
 598         mutex_unlock(&usbfs_mutex);
 599
 600         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 601                         ifnum++) {
 602                 if (test_bit(ifnum, &ps->ifclaimed))
 603                         releaseintf(ps, ifnum);
 604         }
 605         destroy_all_async(ps);
 606         usb_unlock_device(dev);
 607         usb_put_dev(dev);
 608         kfree(ps);
 609         return 0;
 610 }
 611
 612 static int proc_control(struct dev_state *ps, void __user *arg)
 613 {
 614         struct usb_device *dev = ps->dev;
 615         struct usbdevfs_ctrltransfer ctrl;
 616         unsigned int tmo;
 617         unsigned char *tbuf;
 618         int i, j, ret;
 619
 620         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 621                 return -EFAULT;
 622         if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
 623                 return ret;
 624         if (ctrl.wLength > PAGE_SIZE)
 625                 return -EINVAL;
 626         if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
 627                 return -ENOMEM;
 628         tmo = ctrl.timeout;
 629         if (ctrl.bRequestType & 0x80) {
 630                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
 631                         free_page((unsigned long)tbuf);
 632                         return -EINVAL;
 633                 }
 634                 snoop(&dev->dev, "control read: bRequest=%02x "
 635                                 "bRrequestType=%02x wValue=%04x "
 636                                 "wIndex=%04x wLength=%04x\n",
 637                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 638                                 ctrl.wIndex, ctrl.wLength);
 639
 640                 usb_unlock_device(dev);
 641                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 642                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 643                 usb_lock_device(dev);
 644                 if ((i > 0) && ctrl.wLength) {
 645                         if (usbfs_snoop) {
 646                                 dev_info(&dev->dev, "control read: data ");
 647                                 for (j = 0; j < i; ++j)
 648                                         printk("%02x ", (unsigned char)(tbuf)[j]);
 649                                 printk("\n");
 650                         }
 651                         if (copy_to_user(ctrl.data, tbuf, i)) {
 652                                 free_page((unsigned long)tbuf);
 653                                 return -EFAULT;
 654                         }
 655                 }
 656         } else {
 657                 if (ctrl.wLength) {
 658                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 659                                 free_page((unsigned long)tbuf);
 660                                 return -EFAULT;
 661                         }
 662                 }
 663                 snoop(&dev->dev, "control write: bRequest=%02x "
 664                                 "bRrequestType=%02x wValue=%04x "
 665                                 "wIndex=%04x wLength=%04x\n",
 666                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 667                                 ctrl.wIndex, ctrl.wLength);
 668                 if (usbfs_snoop) {
 669                         dev_info(&dev->dev, "control write: data: ");
 670                         for (j = 0; j < ctrl.wLength; ++j)
 671                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 672                         printk("\n");
 673                 }
 674                 usb_unlock_device(dev);
 675                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
 676                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
 677                 usb_lock_device(dev);
 678         }
 679         free_page((unsigned long)tbuf);
 680         if (i<0 && i != -EPIPE) {
 681                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 682                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 683                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 684                            ctrl.wLength, i);
 685         }
 686         return i;
 687 }
 688
 689 static int proc_bulk(struct dev_state *ps, void __user *arg)
 690 {
 691         struct usb_device *dev = ps->dev;
 692         struct usbdevfs_bulktransfer bulk;
 693         unsigned int tmo, len1, pipe;
 694         int len2;
 695         unsigned char *tbuf;
 696         int i, j, ret;
 697
 698         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 699                 return -EFAULT;
 700         if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
 701                 return ret;
 702         if ((ret = checkintf(ps, ret)))
 703                 return ret;
 704         if (bulk.ep & USB_DIR_IN)
 705                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 706         else
 707                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 708         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 709                 return -EINVAL;
 710         len1 = bulk.len;
 711         if (len1 > MAX_USBFS_BUFFER_SIZE)
 712                 return -EINVAL;
 713         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 714                 return -ENOMEM;
 715         tmo = bulk.timeout;
 716         if (bulk.ep & 0x80) {
 717                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 718                         kfree(tbuf);
 719                         return -EINVAL;
 720                 }
 721                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
 722                         bulk.len, bulk.timeout);
 723                 usb_unlock_device(dev);
 724                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 725                 usb_lock_device(dev);
 726                 if (!i && len2) {
 727                         if (usbfs_snoop) {
 728                                 dev_info(&dev->dev, "bulk read: data ");
 729                                 for (j = 0; j < len2; ++j)
 730                                         printk("%02x ", (unsigned char)(tbuf)[j]);
 731                                 printk("\n");
 732                         }
 733                         if (copy_to_user(bulk.data, tbuf, len2)) {
 734                                 kfree(tbuf);
 735                                 return -EFAULT;
 736                         }
 737                 }
 738         } else {
 739                 if (len1) {
 740                         if (copy_from_user(tbuf, bulk.data, len1)) {
 741                                 kfree(tbuf);
 742                                 return -EFAULT;
 743                         }
 744                 }
 745                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
 746                         bulk.len, bulk.timeout);
 747                 if (usbfs_snoop) {
 748                         dev_info(&dev->dev, "bulk write: data: ");
 749                         for (j = 0; j < len1; ++j)
 750                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 751                         printk("\n");
 752                 }
 753                 usb_unlock_device(dev);
 754                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 755                 usb_lock_device(dev);
 756         }
 757         kfree(tbuf);
 758         if (i < 0)
 759                 return i;
 760         return len2;
 761 }
 762
 763 static int proc_resetep(struct dev_state *ps, void __user *arg)
 764 {
 765         unsigned int ep;
 766         int ret;
 767
 768         if (get_user(ep, (unsigned int __user *)arg))
 769                 return -EFAULT;
 770         if ((ret = findintfep(ps->dev, ep)) < 0)
 771                 return ret;
 772         if ((ret = checkintf(ps, ret)))
 773                 return ret;
 774         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
 775         return 0;
 776 }
 777
 778 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 779 {
 780         unsigned int ep;
 781         int pipe;
 782         int ret;
 783
 784         if (get_user(ep, (unsigned int __user *)arg))
 785                 return -EFAULT;
 786         if ((ret = findintfep(ps->dev, ep)) < 0)
 787                 return ret;
 788         if ((ret = checkintf(ps, ret)))
 789                 return ret;
 790         if (ep & USB_DIR_IN)
 791                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 792         else
 793                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 794
 795         return usb_clear_halt(ps->dev, pipe);
 796 }
 797
 798
 799 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 800 {
 801         struct usbdevfs_getdriver gd;
 802         struct usb_interface *intf;
 803         int ret;
 804
 805         if (copy_from_user(&gd, arg, sizeof(gd)))
 806                 return -EFAULT;
 807         down_read(&usb_bus_type.subsys.rwsem);
 808         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 809         if (!intf || !intf->dev.driver)
 810                 ret = -ENODATA;
 811         else {
 812                 strncpy(gd.driver, intf->dev.driver->name,
 813                                 sizeof(gd.driver));
 814                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 815         }
 816         up_read(&usb_bus_type.subsys.rwsem);
 817         return ret;
 818 }
 819
 820 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 821 {
 822         struct usbdevfs_connectinfo ci;
 823
 824         ci.devnum = ps->dev->devnum;
 825         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 826         if (copy_to_user(arg, &ci, sizeof(ci)))
 827                 return -EFAULT;
 828         return 0;
 829 }
 830
 831 static int proc_resetdevice(struct dev_state *ps)
 832 {
 833         return usb_reset_composite_device(ps->dev, NULL);
 834 }
 835
 836 static int proc_setintf(struct dev_state *ps, void __user *arg)
 837 {
 838         struct usbdevfs_setinterface setintf;
 839         int ret;
 840
 841         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 842                 return -EFAULT;
 843         if ((ret = checkintf(ps, setintf.interface)))
 844                 return ret;
 845         return usb_set_interface(ps->dev, setintf.interface,
 846                         setintf.altsetting);
 847 }
 848
 849 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 850 {
 851         unsigned int u;
 852         int status = 0;
 853         struct usb_host_config *actconfig;
 854
 855         if (get_user(u, (unsigned int __user *)arg))
 856                 return -EFAULT;
 857
 858         actconfig = ps->dev->actconfig;
 859
 860         /* Don't touch the device if any interfaces are claimed.
 861          * It could interfere with other drivers' operations, and if
 862          * an interface is claimed by usbfs it could easily deadlock.
 863          */
 864         if (actconfig) {
 865                 int i;
 866
 867                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 868                         if (usb_interface_claimed(actconfig->interface[i])) {
 869                                 dev_warn (&ps->dev->dev,
 870                                         "usbfs: interface %d claimed by %s "
 871                                         "while '%s' sets config #%d\n",
 872                                         actconfig->interface[i]
 873                                                 ->cur_altsetting
 874                                                 ->desc.bInterfaceNumber,
 875                                         actconfig->interface[i]
 876                                                 ->dev.driver->name,
 877                                         current->comm, u);
 878                                 status = -EBUSY;
 879                                 break;
 880                         }
 881                 }
 882         }
 883
 884         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 885          * so avoid usb_set_configuration()'s kick to sysfs
 886          */
 887         if (status == 0) {
 888                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 889                         status = usb_reset_configuration(ps->dev);
 890                 else
 891                         status = usb_set_configuration(ps->dev, u);
 892         }
 893
 894         return status;
 895 }
 896
 897 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 898                              struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
 899                              void __user *arg)
 900 {
 901         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 902         struct usb_host_endpoint *ep;
 903         struct async *as;
 904         struct usb_ctrlrequest *dr = NULL;
 905         unsigned int u, totlen, isofrmlen;
 906         int ret, interval = 0, ifnum = -1;
 907
 908         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
 909                            URB_NO_FSBR|URB_ZERO_PACKET))
 910                 return -EINVAL;
 911         if (!uurb->buffer)
 912                 return -EINVAL;
 913         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
 914                 return -EINVAL;
 915         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
 916                 if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
 917                         return ifnum;
 918                 if ((ret = checkintf(ps, ifnum)))
 919                         return ret;
 920         }
 921         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0)
 922                 ep = ps->dev->ep_in [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 923         else
 924                 ep = ps->dev->ep_out [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 925         if (!ep)
 926                 return -ENOENT;
 927         switch(uurb->type) {
 928         case USBDEVFS_URB_TYPE_CONTROL:
 929                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 930                                 != USB_ENDPOINT_XFER_CONTROL)
 931                         return -EINVAL;
 932                 /* min 8 byte setup packet, max 8 byte setup plus an arbitrary data stage */
 933                 if (uurb->buffer_length < 8 || uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
 934                         return -EINVAL;
 935                 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
 936                         return -ENOMEM;
 937                 if (copy_from_user(dr, uurb->buffer, 8)) {
 938                         kfree(dr);
 939                         return -EFAULT;
 940                 }
 941                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
 942                         kfree(dr);
 943                         return -EINVAL;
 944                 }
 945                 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
 946                         kfree(dr);
 947                         return ret;
 948                 }
 949                 uurb->endpoint = (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK);
 950                 uurb->number_of_packets = 0;
 951                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
 952                 uurb->buffer += 8;
 953                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ?  VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) {
 954                         kfree(dr);
 955                         return -EFAULT;
 956                 }
 957                 snoop(&ps->dev->dev, "control urb\n");
 958                 break;
 959
 960         case USBDEVFS_URB_TYPE_BULK:
 961                 switch (ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 962                 case USB_ENDPOINT_XFER_CONTROL:
 963                 case USB_ENDPOINT_XFER_ISOC:
 964                         return -EINVAL;
 965                 /* allow single-shot interrupt transfers, at bogus rates */
 966                 }
 967                 uurb->number_of_packets = 0;
 968                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
 969                         return -EINVAL;
 970                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
 971                         return -EFAULT;
 972                 snoop(&ps->dev->dev, "bulk urb\n");
 973                 break;
 974
 975         case USBDEVFS_URB_TYPE_ISO:
 976                 /* arbitrary limit */
 977                 if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
 978                         return -EINVAL;
 979                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 980                                 != USB_ENDPOINT_XFER_ISOC)
 981                         return -EINVAL;
 982                 interval = 1 << min (15, ep->desc.bInterval - 1);
 983                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
 984                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
 985                         return -ENOMEM;
 986                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
 987                         kfree(isopkt);
 988                         return -EFAULT;
 989                 }
 990                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
 991                         /* arbitrary limit, sufficient for USB 2.0 high-bandwidth iso */
 992                         if (isopkt[u].length > 8192) {
 993                                 kfree(isopkt);
 994                                 return -EINVAL;
 995                         }
 996                         totlen += isopkt[u].length;
 997                 }
 998                 if (totlen > 32768) {
 999                         kfree(isopkt);
1000                         return -EINVAL;
1001                 }
1002                 uurb->buffer_length = totlen;
1003                 snoop(&ps->dev->dev, "iso urb\n");
1004                 break;
1005
1006         case USBDEVFS_URB_TYPE_INTERRUPT:
1007                 uurb->number_of_packets = 0;
1008                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
1009                                 != USB_ENDPOINT_XFER_INT)
1010                         return -EINVAL;
1011                 if (ps->dev->speed == USB_SPEED_HIGH)
1012                         interval = 1 << min (15, ep->desc.bInterval - 1);
1013                 else
1014                         interval = ep->desc.bInterval;
1015                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1016                         return -EINVAL;
1017                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
1018                         return -EFAULT;
1019                 snoop(&ps->dev->dev, "interrupt urb\n");
1020                 break;
1021
1022         default:
1023                 return -EINVAL;
1024         }
1025         if (!(as = alloc_async(uurb->number_of_packets))) {
1026                 kfree(isopkt);
1027                 kfree(dr);
1028                 return -ENOMEM;
1029         }
1030         if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
1031                 kfree(isopkt);
1032                 kfree(dr);
1033                 free_async(as);
1034                 return -ENOMEM;
1035         }
1036         as->urb->dev = ps->dev;
1037         as->urb->pipe = (uurb->type << 30) | __create_pipe(ps->dev, uurb->endpoint & 0xf) | (uurb->endpoint & USB_DIR_IN);
1038         as->urb->transfer_flags = uurb->flags;
1039         as->urb->transfer_buffer_length = uurb->buffer_length;
1040         as->urb->setup_packet = (unsigned char*)dr;
1041         as->urb->start_frame = uurb->start_frame;
1042         as->urb->number_of_packets = uurb->number_of_packets;
1043         as->urb->interval = interval;
1044         as->urb->context = as;
1045         as->urb->complete = async_completed;
1046         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1047                 as->urb->iso_frame_desc[u].offset = totlen;
1048                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1049                 totlen += isopkt[u].length;
1050         }
1051         kfree(isopkt);
1052         as->ps = ps;
1053         as->userurb = arg;
1054         if (uurb->endpoint & USB_DIR_IN)
1055                 as->userbuffer = uurb->buffer;
1056         else
1057                 as->userbuffer = NULL;
1058         as->signr = uurb->signr;
1059         as->ifnum = ifnum;
1060         as->pid = current->pid;
1061         as->uid = current->uid;
1062         as->euid = current->euid;
1063         security_task_getsecid(current, &as->secid);
1064         if (!(uurb->endpoint & USB_DIR_IN)) {
1065                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, as->urb->transfer_buffer_length)) {
1066                         free_async(as);
1067                         return -EFAULT;
1068                 }
1069         }
1070         snoop(&as->urb->dev->dev, "submit urb\n");
1071         snoop_urb(as->urb, as->userurb);
1072         async_newpending(as);
1073         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1074                 dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
1075                 async_removepending(as);
1076                 free_async(as);
1077                 return ret;
1078         }
1079         return 0;
1080 }
1081
1082 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1083 {
1084         struct usbdevfs_urb uurb;
1085
1086         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1087                 return -EFAULT;
1088
1089         return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg);
1090 }
1091
1092 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1093 {
1094         struct async *as;
1095
1096         as = async_getpending(ps, arg);
1097         if (!as)
1098                 return -EINVAL;
1099         usb_kill_urb(as->urb);
1100         return 0;
1101 }
1102
1103 static int processcompl(struct async *as, void __user * __user *arg)
1104 {
1105         struct urb *urb = as->urb;
1106         struct usbdevfs_urb __user *userurb = as->userurb;
1107         void __user *addr = as->userurb;
1108         unsigned int i;
1109
1110         if (as->userbuffer)
1111                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1112                         return -EFAULT;
1113         if (put_user(urb->status, &userurb->status))
1114                 return -EFAULT;
1115         if (put_user(urb->actual_length, &userurb->actual_length))
1116                 return -EFAULT;
1117         if (put_user(urb->error_count, &userurb->error_count))
1118                 return -EFAULT;
1119
1120         if (usb_pipeisoc(urb->pipe)) {
1121                 for (i = 0; i < urb->number_of_packets; i++) {
1122                         if (put_user(urb->iso_frame_desc[i].actual_length,
1123                                      &userurb->iso_frame_desc[i].actual_length))
1124                                 return -EFAULT;
1125                         if (put_user(urb->iso_frame_desc[i].status,
1126                                      &userurb->iso_frame_desc[i].status))
1127                                 return -EFAULT;
1128                 }
1129         }
1130
1131         free_async(as);
1132
1133         if (put_user(addr, (void __user * __user *)arg))
1134                 return -EFAULT;
1135         return 0;
1136 }
1137
1138 static struct async* reap_as(struct dev_state *ps)
1139 {
1140         DECLARE_WAITQUEUE(wait, current);
1141         struct async *as = NULL;
1142         struct usb_device *dev = ps->dev;
1143
1144         add_wait_queue(&ps->wait, &wait);
1145         for (;;) {
1146                 __set_current_state(TASK_INTERRUPTIBLE);
1147                 if ((as = async_getcompleted(ps)))
1148                         break;
1149                 if (signal_pending(current))
1150                         break;
1151                 usb_unlock_device(dev);
1152                 schedule();
1153                 usb_lock_device(dev);
1154         }
1155         remove_wait_queue(&ps->wait, &wait);
1156         set_current_state(TASK_RUNNING);
1157         return as;
1158 }
1159
1160 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1161 {
1162         struct async *as = reap_as(ps);
1163         if (as)
1164                 return processcompl(as, (void __user * __user *)arg);
1165         if (signal_pending(current))
1166                 return -EINTR;
1167         return -EIO;
1168 }
1169
1170 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1171 {
1172         struct async *as;
1173
1174         if (!(as = async_getcompleted(ps)))
1175                 return -EAGAIN;
1176         return processcompl(as, (void __user * __user *)arg);
1177 }
1178
1179 #ifdef CONFIG_COMPAT
1180
1181 static int get_urb32(struct usbdevfs_urb *kurb,
1182                      struct usbdevfs_urb32 __user *uurb)
1183 {
1184         __u32  uptr;
1185         if (get_user(kurb->type, &uurb->type) ||
1186             __get_user(kurb->endpoint, &uurb->endpoint) ||
1187             __get_user(kurb->status, &uurb->status) ||
1188             __get_user(kurb->flags, &uurb->flags) ||
1189             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1190             __get_user(kurb->actual_length, &uurb->actual_length) ||
1191             __get_user(kurb->start_frame, &uurb->start_frame) ||
1192             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1193             __get_user(kurb->error_count, &uurb->error_count) ||
1194             __get_user(kurb->signr, &uurb->signr))
1195                 return -EFAULT;
1196
1197         if (__get_user(uptr, &uurb->buffer))
1198                 return -EFAULT;
1199         kurb->buffer = compat_ptr(uptr);
1200         if (__get_user(uptr, &uurb->buffer))
1201                 return -EFAULT;
1202         kurb->usercontext = compat_ptr(uptr);
1203
1204         return 0;
1205 }
1206
1207 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1208 {
1209         struct usbdevfs_urb uurb;
1210
1211         if (get_urb32(&uurb,(struct usbdevfs_urb32 *)arg))
1212                 return -EFAULT;
1213
1214         return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg);
1215 }
1216
1217 static int processcompl_compat(struct async *as, void __user * __user *arg)
1218 {
1219         struct urb *urb = as->urb;
1220         struct usbdevfs_urb32 __user *userurb = as->userurb;
1221         void __user *addr = as->userurb;
1222         unsigned int i;
1223
1224         if (as->userbuffer)
1225                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1226                         return -EFAULT;
1227         if (put_user(urb->status, &userurb->status))
1228                 return -EFAULT;
1229         if (put_user(urb->actual_length, &userurb->actual_length))
1230                 return -EFAULT;
1231         if (put_user(urb->error_count, &userurb->error_count))
1232                 return -EFAULT;
1233
1234         if (usb_pipeisoc(urb->pipe)) {
1235                 for (i = 0; i < urb->number_of_packets; i++) {
1236                         if (put_user(urb->iso_frame_desc[i].actual_length,
1237                                      &userurb->iso_frame_desc[i].actual_length))
1238                                 return -EFAULT;
1239                         if (put_user(urb->iso_frame_desc[i].status,
1240                                      &userurb->iso_frame_desc[i].status))
1241                                 return -EFAULT;
1242                 }
1243         }
1244
1245         free_async(as);
1246         if (put_user((u32)(u64)addr, (u32 __user *)arg))
1247                 return -EFAULT;
1248         return 0;
1249 }
1250
1251 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1252 {
1253         struct async *as = reap_as(ps);
1254         if (as)
1255                 return processcompl_compat(as, (void __user * __user *)arg);
1256         if (signal_pending(current))
1257                 return -EINTR;
1258         return -EIO;
1259 }
1260
1261 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1262 {
1263         struct async *as;
1264
1265         if (!(as = async_getcompleted(ps)))
1266                 return -EAGAIN;
1267         return processcompl_compat(as, (void __user * __user *)arg);
1268 }
1269
1270 #endif
1271
1272 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1273 {
1274         struct usbdevfs_disconnectsignal ds;
1275
1276         if (copy_from_user(&ds, arg, sizeof(ds)))
1277                 return -EFAULT;
1278         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1279                 return -EINVAL;
1280         ps->discsignr = ds.signr;
1281         ps->disccontext = ds.context;
1282         return 0;
1283 }
1284
1285 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1286 {
1287         unsigned int ifnum;
1288
1289         if (get_user(ifnum, (unsigned int __user *)arg))
1290                 return -EFAULT;
1291         return claimintf(ps, ifnum);
1292 }
1293
1294 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1295 {
1296         unsigned int ifnum;
1297         int ret;
1298
1299         if (get_user(ifnum, (unsigned int __user *)arg))
1300                 return -EFAULT;
1301         if ((ret = releaseintf(ps, ifnum)) < 0)
1302                 return ret;
1303         destroy_async_on_interface (ps, ifnum);
1304         return 0;
1305 }
1306
1307 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1308 {
1309         int                     size;
1310         void                    *buf = NULL;
1311         int                     retval = 0;
1312         struct usb_interface    *intf = NULL;
1313         struct usb_driver       *driver = NULL;
1314
1315         /* alloc buffer */
1316         if ((size = _IOC_SIZE (ctl->ioctl_code)) > 0) {
1317                 if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
1318                         return -ENOMEM;
1319                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1320                         if (copy_from_user (buf, ctl->data, size)) {
1321                                 kfree(buf);
1322                                 return -EFAULT;
1323                         }
1324                 } else {
1325                         memset (buf, 0, size);
1326                 }
1327         }
1328
1329         if (!connected(ps->dev)) {
1330                 kfree(buf);
1331                 return -ENODEV;
1332         }
1333
1334         if (ps->dev->state != USB_STATE_CONFIGURED)
1335                 retval = -EHOSTUNREACH;
1336         else if (!(intf = usb_ifnum_to_if (ps->dev, ctl->ifno)))
1337                retval = -EINVAL;
1338         else switch (ctl->ioctl_code) {
1339
1340         /* disconnect kernel driver from interface */
1341         case USBDEVFS_DISCONNECT:
1342
1343                 down_write(&usb_bus_type.subsys.rwsem);
1344                 if (intf->dev.driver) {
1345                         driver = to_usb_driver(intf->dev.driver);
1346                         dev_dbg (&intf->dev, "disconnect by usbfs\n");
1347                         usb_driver_release_interface(driver, intf);
1348                 } else
1349                         retval = -ENODATA;
1350                 up_write(&usb_bus_type.subsys.rwsem);
1351                 break;
1352
1353         /* let kernel drivers try to (re)bind to the interface */
1354         case USBDEVFS_CONNECT:
1355                 usb_unlock_device(ps->dev);
1356                 bus_rescan_devices(intf->dev.bus);
1357                 usb_lock_device(ps->dev);
1358                 break;
1359
1360         /* talk directly to the interface's driver */
1361         default:
1362                 down_read(&usb_bus_type.subsys.rwsem);
1363                 if (intf->dev.driver)
1364                         driver = to_usb_driver(intf->dev.driver);
1365                 if (driver == NULL || driver->ioctl == NULL) {
1366                         retval = -ENOTTY;
1367                 } else {
1368                         retval = driver->ioctl (intf, ctl->ioctl_code, buf);
1369                         if (retval == -ENOIOCTLCMD)
1370                                 retval = -ENOTTY;
1371                 }
1372                 up_read(&usb_bus_type.subsys.rwsem);
1373         }
1374
1375         /* cleanup and return */
1376         if (retval >= 0
1377                         && (_IOC_DIR (ctl->ioctl_code) & _IOC_READ) != 0
1378                         && size > 0
1379                         && copy_to_user (ctl->data, buf, size) != 0)
1380                 retval = -EFAULT;
1381
1382         kfree(buf);
1383         return retval;
1384 }
1385
1386 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1387 {
1388         struct usbdevfs_ioctl   ctrl;
1389
1390         if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
1391                 return -EFAULT;
1392         return proc_ioctl(ps, &ctrl);
1393 }
1394
1395 #ifdef CONFIG_COMPAT
1396 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1397 {
1398         struct usbdevfs_ioctl32 __user *uioc;
1399         struct usbdevfs_ioctl ctrl;
1400         u32 udata;
1401
1402         uioc = compat_ptr((long)arg);
1403         if (get_user(ctrl.ifno, &uioc->ifno) ||
1404             get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1405             __get_user(udata, &uioc->data))
1406                 return -EFAULT;
1407         ctrl.data = compat_ptr(udata);
1408
1409         return proc_ioctl(ps, &ctrl);
1410 }
1411 #endif
1412
1413 /*
1414  * NOTE:  All requests here that have interface numbers as parameters
1415  * are assuming that somehow the configuration has been prevented from
1416  * changing.  But there's no mechanism to ensure that...
1417  */
1418 static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1419 {
1420         struct dev_state *ps = (struct dev_state *)file->private_data;
1421         struct usb_device *dev = ps->dev;
1422         void __user *p = (void __user *)arg;
1423         int ret = -ENOTTY;
1424
1425         if (!(file->f_mode & FMODE_WRITE))
1426                 return -EPERM;
1427         usb_lock_device(dev);
1428         if (!connected(dev)) {
1429                 usb_unlock_device(dev);
1430                 return -ENODEV;
1431         }
1432
1433         switch (cmd) {
1434         case USBDEVFS_CONTROL:
1435                 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
1436                 ret = proc_control(ps, p);
1437                 if (ret >= 0)
1438                         inode->i_mtime = CURRENT_TIME;
1439                 break;
1440
1441         case USBDEVFS_BULK:
1442                 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
1443                 ret = proc_bulk(ps, p);
1444                 if (ret >= 0)
1445                         inode->i_mtime = CURRENT_TIME;
1446                 break;
1447
1448         case USBDEVFS_RESETEP:
1449                 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
1450                 ret = proc_resetep(ps, p);
1451                 if (ret >= 0)
1452                         inode->i_mtime = CURRENT_TIME;
1453                 break;
1454
1455         case USBDEVFS_RESET:
1456                 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
1457                 ret = proc_resetdevice(ps);
1458                 break;
1459
1460         case USBDEVFS_CLEAR_HALT:
1461                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
1462                 ret = proc_clearhalt(ps, p);
1463                 if (ret >= 0)
1464                         inode->i_mtime = CURRENT_TIME;
1465                 break;
1466
1467         case USBDEVFS_GETDRIVER:
1468                 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
1469                 ret = proc_getdriver(ps, p);
1470                 break;
1471
1472         case USBDEVFS_CONNECTINFO:
1473                 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
1474                 ret = proc_connectinfo(ps, p);
1475                 break;
1476
1477         case USBDEVFS_SETINTERFACE:
1478                 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
1479                 ret = proc_setintf(ps, p);
1480                 break;
1481
1482         case USBDEVFS_SETCONFIGURATION:
1483                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
1484                 ret = proc_setconfig(ps, p);
1485                 break;
1486
1487         case USBDEVFS_SUBMITURB:
1488                 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
1489                 ret = proc_submiturb(ps, p);
1490                 if (ret >= 0)
1491                         inode->i_mtime = CURRENT_TIME;
1492                 break;
1493
1494 #ifdef CONFIG_COMPAT
1495
1496         case USBDEVFS_SUBMITURB32:
1497                 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
1498                 ret = proc_submiturb_compat(ps, p);
1499                 if (ret >= 0)
1500                         inode->i_mtime = CURRENT_TIME;
1501                 break;
1502
1503         case USBDEVFS_REAPURB32:
1504                 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
1505                 ret = proc_reapurb_compat(ps, p);
1506                 break;
1507
1508         case USBDEVFS_REAPURBNDELAY32:
1509                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
1510                 ret = proc_reapurbnonblock_compat(ps, p);
1511                 break;
1512
1513         case USBDEVFS_IOCTL32:
1514                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1515                 ret = proc_ioctl_compat(ps, (compat_uptr_t)(long)p);
1516                 break;
1517 #endif
1518
1519         case USBDEVFS_DISCARDURB:
1520                 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
1521                 ret = proc_unlinkurb(ps, p);
1522                 break;
1523
1524         case USBDEVFS_REAPURB:
1525                 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
1526                 ret = proc_reapurb(ps, p);
1527                 break;
1528
1529         case USBDEVFS_REAPURBNDELAY:
1530                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
1531                 ret = proc_reapurbnonblock(ps, p);
1532                 break;
1533
1534         case USBDEVFS_DISCSIGNAL:
1535                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
1536                 ret = proc_disconnectsignal(ps, p);
1537                 break;
1538
1539         case USBDEVFS_CLAIMINTERFACE:
1540                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
1541                 ret = proc_claiminterface(ps, p);
1542                 break;
1543
1544         case USBDEVFS_RELEASEINTERFACE:
1545                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
1546                 ret = proc_releaseinterface(ps, p);
1547                 break;
1548
1549         case USBDEVFS_IOCTL:
1550                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1551                 ret = proc_ioctl_default(ps, p);
1552                 break;
1553         }
1554         usb_unlock_device(dev);
1555         if (ret >= 0)
1556                 inode->i_atime = CURRENT_TIME;
1557         return ret;
1558 }
1559
1560 /* No kernel lock - fine */
1561 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
1562 {
1563         struct dev_state *ps = (struct dev_state *)file->private_data;
1564         unsigned int mask = 0;
1565
1566         poll_wait(file, &ps->wait, wait);
1567         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1568                 mask |= POLLOUT | POLLWRNORM;
1569         if (!connected(ps->dev))
1570                 mask |= POLLERR | POLLHUP;
1571         return mask;
1572 }
1573
1574 struct file_operations usbfs_device_file_operations = {
1575         .llseek =       usbdev_lseek,
1576         .read =         usbdev_read,
1577         .poll =         usbdev_poll,
1578         .ioctl =        usbdev_ioctl,
1579         .open =         usbdev_open,
1580         .release =      usbdev_release,
1581 };
1582
1583 static void usbdev_add(struct usb_device *dev)
1584 {
1585         int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1586
1587         dev->class_dev = class_device_create(usb_device_class, NULL,
1588                                 MKDEV(USB_DEVICE_MAJOR, minor), &dev->dev,
1589                                 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1590
1591         dev->class_dev->class_data = dev;
1592 }
1593
1594 static void usbdev_remove(struct usb_device *dev)
1595 {
1596         class_device_unregister(dev->class_dev);
1597 }
1598
1599 static int usbdev_notify(struct notifier_block *self, unsigned long action,
1600                          void *dev)
1601 {
1602         switch (action) {
1603         case USB_DEVICE_ADD:
1604                 usbdev_add(dev);
1605                 break;
1606         case USB_DEVICE_REMOVE:
1607                 usbdev_remove(dev);
1608                 break;
1609         }
1610         return NOTIFY_OK;
1611 }
1612
1613 static struct notifier_block usbdev_nb = {
1614         .notifier_call =        usbdev_notify,
1615 };
1616
1617 static struct cdev usb_device_cdev = {
1618         .kobj   = {.name = "usb_device", },
1619         .owner  = THIS_MODULE,
1620 };
1621
1622 int __init usbdev_init(void)
1623 {
1624         int retval;
1625
1626         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1627                         "usb_device");
1628         if (retval) {
1629                 err("unable to register minors for usb_device");
1630                 goto out;
1631         }
1632         cdev_init(&usb_device_cdev, &usbfs_device_file_operations);
1633         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1634         if (retval) {
1635                 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1636                 goto error_cdev;
1637         }
1638         usb_device_class = class_create(THIS_MODULE, "usb_device");
1639         if (IS_ERR(usb_device_class)) {
1640                 err("unable to register usb_device class");
1641                 retval = PTR_ERR(usb_device_class);
1642                 goto error_class;
1643         }
1644
1645         usb_register_notify(&usbdev_nb);
1646
1647 out:
1648         return retval;
1649
1650 error_class:
1651         usb_device_class = NULL;
1652         cdev_del(&usb_device_cdev);
1653
1654 error_cdev:
1655         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1656         goto out;
1657 }
1658
1659 void usbdev_cleanup(void)
1660 {
1661         usb_unregister_notify(&usbdev_nb);
1662         class_destroy(usb_device_class);
1663         cdev_del(&usb_device_cdev);
1664         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1665 }
1666