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  *  This file implements the usbfs/x/y files, where
  23  *  x is the bus number and y the device number.
  24  *
  25  *  It allows user space programs/"drivers" to communicate directly
  26  *  with USB devices without intervening kernel driver.
  27  *
  28  *  Revision history
  29  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  30  *    04.01.2000   0.2   Turned into its own filesystem
  31  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  32  *                       (CAN-2005-3055)
  33  */
  34
  35 /*****************************************************************************/
  36
  37 #include <linux/fs.h>
  38 #include <linux/mm.h>
  39 #include <linux/slab.h>
  40 #include <linux/smp_lock.h>
  41 #include <linux/signal.h>
  42 #include <linux/poll.h>
  43 #include <linux/module.h>
  44 #include <linux/usb.h>
  45 #include <linux/usbdevice_fs.h>
  46 #include <linux/cdev.h>
  47 #include <linux/notifier.h>
  48 #include <linux/security.h>
  49 #include <asm/uaccess.h>
  50 #include <asm/byteorder.h>
  51 #include <linux/moduleparam.h>
  52
  53 #include "hcd.h"        /* for usbcore internals */
  54 #include "usb.h"
  55
  56 #define USB_MAXBUS                      64
  57 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
  58
  59 /* Mutual exclusion for removal, open, and release */
  60 DEFINE_MUTEX(usbfs_mutex);
  61
  62 struct dev_state {
  63         struct list_head list;      /* state list */
  64         struct usb_device *dev;
  65         struct file *file;
  66         spinlock_t lock;            /* protects the async urb lists */
  67         struct list_head async_pending;
  68         struct list_head async_completed;
  69         wait_queue_head_t wait;     /* wake up if a request completed */
  70         unsigned int discsignr;
  71         struct pid *disc_pid;
  72         uid_t disc_uid, disc_euid;
  73         void __user *disccontext;
  74         unsigned long ifclaimed;
  75         u32 secid;
  76 };
  77
  78 struct async {
  79         struct list_head asynclist;
  80         struct dev_state *ps;
  81         struct pid *pid;
  82         uid_t uid, euid;
  83         unsigned int signr;
  84         unsigned int ifnum;
  85         void __user *userbuffer;
  86         void __user *userurb;
  87         struct urb *urb;
  88         int status;
  89         u32 secid;
  90 };
  91
  92 static int usbfs_snoop;
  93 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  94 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
  95
  96 #define snoop(dev, format, arg...)                              \
  97         do {                                                    \
  98                 if (usbfs_snoop)                                \
  99                         dev_info(dev , format , ## arg);        \
 100         } while (0)
 101
 102 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 103
 104
 105 #define MAX_USBFS_BUFFER_SIZE   16384
 106
 107 static inline int connected(struct dev_state *ps)
 108 {
 109         return (!list_empty(&ps->list) &&
 110                         ps->dev->state != USB_STATE_NOTATTACHED);
 111 }
 112
 113 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
 114 {
 115         loff_t ret;
 116
 117         lock_kernel();
 118
 119         switch (orig) {
 120         case 0:
 121                 file->f_pos = offset;
 122                 ret = file->f_pos;
 123                 break;
 124         case 1:
 125                 file->f_pos += offset;
 126                 ret = file->f_pos;
 127                 break;
 128         case 2:
 129         default:
 130                 ret = -EINVAL;
 131         }
 132
 133         unlock_kernel();
 134         return ret;
 135 }
 136
 137 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 138                            loff_t *ppos)
 139 {
 140         struct dev_state *ps = file->private_data;
 141         struct usb_device *dev = ps->dev;
 142         ssize_t ret = 0;
 143         unsigned len;
 144         loff_t pos;
 145         int i;
 146
 147         pos = *ppos;
 148         usb_lock_device(dev);
 149         if (!connected(ps)) {
 150                 ret = -ENODEV;
 151                 goto err;
 152         } else if (pos < 0) {
 153                 ret = -EINVAL;
 154                 goto err;
 155         }
 156
 157         if (pos < sizeof(struct usb_device_descriptor)) {
 158                 /* 18 bytes - fits on the stack */
 159                 struct usb_device_descriptor temp_desc;
 160
 161                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 162                 le16_to_cpus(&temp_desc.bcdUSB);
 163                 le16_to_cpus(&temp_desc.idVendor);
 164                 le16_to_cpus(&temp_desc.idProduct);
 165                 le16_to_cpus(&temp_desc.bcdDevice);
 166
 167                 len = sizeof(struct usb_device_descriptor) - pos;
 168                 if (len > nbytes)
 169                         len = nbytes;
 170                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 171                         ret = -EFAULT;
 172                         goto err;
 173                 }
 174
 175                 *ppos += len;
 176                 buf += len;
 177                 nbytes -= len;
 178                 ret += len;
 179         }
 180
 181         pos = sizeof(struct usb_device_descriptor);
 182         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 183                 struct usb_config_descriptor *config =
 184                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 185                 unsigned int length = le16_to_cpu(config->wTotalLength);
 186
 187                 if (*ppos < pos + length) {
 188
 189                         /* The descriptor may claim to be longer than it
 190                          * really is.  Here is the actual allocated length. */
 191                         unsigned alloclen =
 192                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 193
 194                         len = length - (*ppos - pos);
 195                         if (len > nbytes)
 196                                 len = nbytes;
 197
 198                         /* Simply don't write (skip over) unallocated parts */
 199                         if (alloclen > (*ppos - pos)) {
 200                                 alloclen -= (*ppos - pos);
 201                                 if (copy_to_user(buf,
 202                                     dev->rawdescriptors[i] + (*ppos - pos),
 203                                     min(len, alloclen))) {
 204                                         ret = -EFAULT;
 205                                         goto err;
 206                                 }
 207                         }
 208
 209                         *ppos += len;
 210                         buf += len;
 211                         nbytes -= len;
 212                         ret += len;
 213                 }
 214
 215                 pos += length;
 216         }
 217
 218 err:
 219         usb_unlock_device(dev);
 220         return ret;
 221 }
 222
 223 /*
 224  * async list handling
 225  */
 226
 227 static struct async *alloc_async(unsigned int numisoframes)
 228 {
 229         struct async *as;
 230
 231         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 232         if (!as)
 233                 return NULL;
 234         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 235         if (!as->urb) {
 236                 kfree(as);
 237                 return NULL;
 238         }
 239         return as;
 240 }
 241
 242 static void free_async(struct async *as)
 243 {
 244         put_pid(as->pid);
 245         kfree(as->urb->transfer_buffer);
 246         kfree(as->urb->setup_packet);
 247         usb_free_urb(as->urb);
 248         kfree(as);
 249 }
 250
 251 static inline void async_newpending(struct async *as)
 252 {
 253         struct dev_state *ps = as->ps;
 254         unsigned long flags;
 255
 256         spin_lock_irqsave(&ps->lock, flags);
 257         list_add_tail(&as->asynclist, &ps->async_pending);
 258         spin_unlock_irqrestore(&ps->lock, flags);
 259 }
 260
 261 static inline void async_removepending(struct async *as)
 262 {
 263         struct dev_state *ps = as->ps;
 264         unsigned long flags;
 265
 266         spin_lock_irqsave(&ps->lock, flags);
 267         list_del_init(&as->asynclist);
 268         spin_unlock_irqrestore(&ps->lock, flags);
 269 }
 270
 271 static inline struct async *async_getcompleted(struct dev_state *ps)
 272 {
 273         unsigned long flags;
 274         struct async *as = NULL;
 275
 276         spin_lock_irqsave(&ps->lock, flags);
 277         if (!list_empty(&ps->async_completed)) {
 278                 as = list_entry(ps->async_completed.next, struct async,
 279                                 asynclist);
 280                 list_del_init(&as->asynclist);
 281         }
 282         spin_unlock_irqrestore(&ps->lock, flags);
 283         return as;
 284 }
 285
 286 static inline struct async *async_getpending(struct dev_state *ps,
 287                                              void __user *userurb)
 288 {
 289         unsigned long flags;
 290         struct async *as;
 291
 292         spin_lock_irqsave(&ps->lock, flags);
 293         list_for_each_entry(as, &ps->async_pending, asynclist)
 294                 if (as->userurb == userurb) {
 295                         list_del_init(&as->asynclist);
 296                         spin_unlock_irqrestore(&ps->lock, flags);
 297                         return as;
 298                 }
 299         spin_unlock_irqrestore(&ps->lock, flags);
 300         return NULL;
 301 }
 302
 303 static void snoop_urb(struct urb *urb, void __user *userurb)
 304 {
 305         int j;
 306         unsigned char *data = urb->transfer_buffer;
 307
 308         if (!usbfs_snoop)
 309                 return;
 310
 311         dev_info(&urb->dev->dev, "direction=%s\n",
 312                         usb_urb_dir_in(urb) ? "IN" : "OUT");
 313         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
 314         dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
 315                  urb->transfer_buffer_length);
 316         dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
 317         dev_info(&urb->dev->dev, "data: ");
 318         for (j = 0; j < urb->transfer_buffer_length; ++j)
 319                 printk("%02x ", data[j]);
 320         printk("\n");
 321 }
 322
 323 static void async_completed(struct urb *urb)
 324 {
 325         struct async *as = urb->context;
 326         struct dev_state *ps = as->ps;
 327         struct siginfo sinfo;
 328
 329         spin_lock(&ps->lock);
 330         list_move_tail(&as->asynclist, &ps->async_completed);
 331         spin_unlock(&ps->lock);
 332         as->status = urb->status;
 333         if (as->signr) {
 334                 sinfo.si_signo = as->signr;
 335                 sinfo.si_errno = as->status;
 336                 sinfo.si_code = SI_ASYNCIO;
 337                 sinfo.si_addr = as->userurb;
 338                 kill_pid_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
 339                                       as->euid, as->secid);
 340         }
 341         snoop(&urb->dev->dev, "urb complete\n");
 342         snoop_urb(urb, as->userurb);
 343         wake_up(&ps->wait);
 344 }
 345
 346 static void destroy_async(struct dev_state *ps, struct list_head *list)
 347 {
 348         struct async *as;
 349         unsigned long flags;
 350
 351         spin_lock_irqsave(&ps->lock, flags);
 352         while (!list_empty(list)) {
 353                 as = list_entry(list->next, struct async, asynclist);
 354                 list_del_init(&as->asynclist);
 355
 356                 /* drop the spinlock so the completion handler can run */
 357                 spin_unlock_irqrestore(&ps->lock, flags);
 358                 usb_kill_urb(as->urb);
 359                 spin_lock_irqsave(&ps->lock, flags);
 360         }
 361         spin_unlock_irqrestore(&ps->lock, flags);
 362         as = async_getcompleted(ps);
 363         while (as) {
 364                 free_async(as);
 365                 as = async_getcompleted(ps);
 366         }
 367 }
 368
 369 static void destroy_async_on_interface(struct dev_state *ps,
 370                                        unsigned int ifnum)
 371 {
 372         struct list_head *p, *q, hitlist;
 373         unsigned long flags;
 374
 375         INIT_LIST_HEAD(&hitlist);
 376         spin_lock_irqsave(&ps->lock, flags);
 377         list_for_each_safe(p, q, &ps->async_pending)
 378                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 379                         list_move_tail(p, &hitlist);
 380         spin_unlock_irqrestore(&ps->lock, flags);
 381         destroy_async(ps, &hitlist);
 382 }
 383
 384 static inline void destroy_all_async(struct dev_state *ps)
 385 {
 386         destroy_async(ps, &ps->async_pending);
 387 }
 388
 389 /*
 390  * interface claims are made only at the request of user level code,
 391  * which can also release them (explicitly or by closing files).
 392  * they're also undone when devices disconnect.
 393  */
 394
 395 static int driver_probe(struct usb_interface *intf,
 396                         const struct usb_device_id *id)
 397 {
 398         return -ENODEV;
 399 }
 400
 401 static void driver_disconnect(struct usb_interface *intf)
 402 {
 403         struct dev_state *ps = usb_get_intfdata(intf);
 404         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 405
 406         if (!ps)
 407                 return;
 408
 409         /* NOTE:  this relies on usbcore having canceled and completed
 410          * all pending I/O requests; 2.6 does that.
 411          */
 412
 413         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 414                 clear_bit(ifnum, &ps->ifclaimed);
 415         else
 416                 warn("interface number %u out of range", ifnum);
 417
 418         usb_set_intfdata(intf, NULL);
 419
 420         /* force async requests to complete */
 421         destroy_async_on_interface(ps, ifnum);
 422 }
 423
 424 /* The following routines are merely placeholders.  There is no way
 425  * to inform a user task about suspend or resumes.
 426  */
 427 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 428 {
 429         return 0;
 430 }
 431
 432 static int driver_resume(struct usb_interface *intf)
 433 {
 434         return 0;
 435 }
 436
 437 struct usb_driver usbfs_driver = {
 438         .name =         "usbfs",
 439         .probe =        driver_probe,
 440         .disconnect =   driver_disconnect,
 441         .suspend =      driver_suspend,
 442         .resume =       driver_resume,
 443 };
 444
 445 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 446 {
 447         struct usb_device *dev = ps->dev;
 448         struct usb_interface *intf;
 449         int err;
 450
 451         if (ifnum >= 8*sizeof(ps->ifclaimed))
 452                 return -EINVAL;
 453         /* already claimed */
 454         if (test_bit(ifnum, &ps->ifclaimed))
 455                 return 0;
 456
 457         intf = usb_ifnum_to_if(dev, ifnum);
 458         if (!intf)
 459                 err = -ENOENT;
 460         else
 461                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 462         if (err == 0)
 463                 set_bit(ifnum, &ps->ifclaimed);
 464         return err;
 465 }
 466
 467 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 468 {
 469         struct usb_device *dev;
 470         struct usb_interface *intf;
 471         int err;
 472
 473         err = -EINVAL;
 474         if (ifnum >= 8*sizeof(ps->ifclaimed))
 475                 return err;
 476         dev = ps->dev;
 477         intf = usb_ifnum_to_if(dev, ifnum);
 478         if (!intf)
 479                 err = -ENOENT;
 480         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 481                 usb_driver_release_interface(&usbfs_driver, intf);
 482                 err = 0;
 483         }
 484         return err;
 485 }
 486
 487 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 488 {
 489         if (ps->dev->state != USB_STATE_CONFIGURED)
 490                 return -EHOSTUNREACH;
 491         if (ifnum >= 8*sizeof(ps->ifclaimed))
 492                 return -EINVAL;
 493         if (test_bit(ifnum, &ps->ifclaimed))
 494                 return 0;
 495         /* if not yet claimed, claim it for the driver */
 496         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 497                  "interface %u before use\n", task_pid_nr(current),
 498                  current->comm, ifnum);
 499         return claimintf(ps, ifnum);
 500 }
 501
 502 static int findintfep(struct usb_device *dev, unsigned int ep)
 503 {
 504         unsigned int i, j, e;
 505         struct usb_interface *intf;
 506         struct usb_host_interface *alts;
 507         struct usb_endpoint_descriptor *endpt;
 508
 509         if (ep & ~(USB_DIR_IN|0xf))
 510                 return -EINVAL;
 511         if (!dev->actconfig)
 512                 return -ESRCH;
 513         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 514                 intf = dev->actconfig->interface[i];
 515                 for (j = 0; j < intf->num_altsetting; j++) {
 516                         alts = &intf->altsetting[j];
 517                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 518                                 endpt = &alts->endpoint[e].desc;
 519                                 if (endpt->bEndpointAddress == ep)
 520                                         return alts->desc.bInterfaceNumber;
 521                         }
 522                 }
 523         }
 524         return -ENOENT;
 525 }
 526
 527 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
 528                            unsigned int index)
 529 {
 530         int ret = 0;
 531
 532         if (ps->dev->state != USB_STATE_ADDRESS
 533          && ps->dev->state != USB_STATE_CONFIGURED)
 534                 return -EHOSTUNREACH;
 535         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 536                 return 0;
 537
 538         index &= 0xff;
 539         switch (requesttype & USB_RECIP_MASK) {
 540         case USB_RECIP_ENDPOINT:
 541                 ret = findintfep(ps->dev, index);
 542                 if (ret >= 0)
 543                         ret = checkintf(ps, ret);
 544                 break;
 545
 546         case USB_RECIP_INTERFACE:
 547                 ret = checkintf(ps, index);
 548                 break;
 549         }
 550         return ret;
 551 }
 552
 553 static int __match_minor(struct device *dev, void *data)
 554 {
 555         int minor = *((int *)data);
 556
 557         if (dev->devt == MKDEV(USB_DEVICE_MAJOR, minor))
 558                 return 1;
 559         return 0;
 560 }
 561
 562 static struct usb_device *usbdev_lookup_by_minor(int minor)
 563 {
 564         struct device *dev;
 565
 566         dev = bus_find_device(&usb_bus_type, NULL, &minor, __match_minor);
 567         if (!dev)
 568                 return NULL;
 569         put_device(dev);
 570         return container_of(dev, struct usb_device, dev);
 571 }
 572
 573 /*
 574  * file operations
 575  */
 576 static int usbdev_open(struct inode *inode, struct file *file)
 577 {
 578         struct usb_device *dev = NULL;
 579         struct dev_state *ps;
 580         int ret;
 581
 582         lock_kernel();
 583         /* Protect against simultaneous removal or release */
 584         mutex_lock(&usbfs_mutex);
 585
 586         ret = -ENOMEM;
 587         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
 588         if (!ps)
 589                 goto out;
 590
 591         ret = -ENOENT;
 592         /* usbdev device-node */
 593         if (imajor(inode) == USB_DEVICE_MAJOR)
 594                 dev = usbdev_lookup_by_minor(iminor(inode));
 595 #ifdef CONFIG_USB_DEVICEFS
 596         /* procfs file */
 597         if (!dev)
 598                 dev = inode->i_private;
 599 #endif
 600         if (!dev)
 601                 goto out;
 602         ret = usb_autoresume_device(dev);
 603         if (ret)
 604                 goto out;
 605
 606         usb_get_dev(dev);
 607         ret = 0;
 608         ps->dev = dev;
 609         ps->file = file;
 610         spin_lock_init(&ps->lock);
 611         INIT_LIST_HEAD(&ps->list);
 612         INIT_LIST_HEAD(&ps->async_pending);
 613         INIT_LIST_HEAD(&ps->async_completed);
 614         init_waitqueue_head(&ps->wait);
 615         ps->discsignr = 0;
 616         ps->disc_pid = get_pid(task_pid(current));
 617         ps->disc_uid = current->uid;
 618         ps->disc_euid = current->euid;
 619         ps->disccontext = NULL;
 620         ps->ifclaimed = 0;
 621         security_task_getsecid(current, &ps->secid);
 622         smp_wmb();
 623         list_add_tail(&ps->list, &dev->filelist);
 624         file->private_data = ps;
 625  out:
 626         if (ret)
 627                 kfree(ps);
 628         mutex_unlock(&usbfs_mutex);
 629         unlock_kernel();
 630         return ret;
 631 }
 632
 633 static int usbdev_release(struct inode *inode, struct file *file)
 634 {
 635         struct dev_state *ps = file->private_data;
 636         struct usb_device *dev = ps->dev;
 637         unsigned int ifnum;
 638
 639         usb_lock_device(dev);
 640
 641         /* Protect against simultaneous open */
 642         mutex_lock(&usbfs_mutex);
 643         list_del_init(&ps->list);
 644         mutex_unlock(&usbfs_mutex);
 645
 646         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 647                         ifnum++) {
 648                 if (test_bit(ifnum, &ps->ifclaimed))
 649                         releaseintf(ps, ifnum);
 650         }
 651         destroy_all_async(ps);
 652         usb_autosuspend_device(dev);
 653         usb_unlock_device(dev);
 654         usb_put_dev(dev);
 655         put_pid(ps->disc_pid);
 656         kfree(ps);
 657         return 0;
 658 }
 659
 660 static int proc_control(struct dev_state *ps, void __user *arg)
 661 {
 662         struct usb_device *dev = ps->dev;
 663         struct usbdevfs_ctrltransfer ctrl;
 664         unsigned int tmo;
 665         unsigned char *tbuf;
 666         unsigned wLength;
 667         int i, j, ret;
 668
 669         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 670                 return -EFAULT;
 671         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
 672         if (ret)
 673                 return ret;
 674         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
 675         if (wLength > PAGE_SIZE)
 676                 return -EINVAL;
 677         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
 678         if (!tbuf)
 679                 return -ENOMEM;
 680         tmo = ctrl.timeout;
 681         if (ctrl.bRequestType & 0x80) {
 682                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
 683                                                ctrl.wLength)) {
 684                         free_page((unsigned long)tbuf);
 685                         return -EINVAL;
 686                 }
 687                 snoop(&dev->dev, "control read: bRequest=%02x "
 688                                 "bRrequestType=%02x wValue=%04x "
 689                                 "wIndex=%04x wLength=%04x\n",
 690                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 691                                 ctrl.wIndex, ctrl.wLength);
 692
 693                 usb_unlock_device(dev);
 694                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest,
 695                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 696                                     tbuf, ctrl.wLength, tmo);
 697                 usb_lock_device(dev);
 698                 if ((i > 0) && ctrl.wLength) {
 699                         if (usbfs_snoop) {
 700                                 dev_info(&dev->dev, "control read: data ");
 701                                 for (j = 0; j < i; ++j)
 702                                         printk("%02x ", (u8)(tbuf)[j]);
 703                                 printk("\n");
 704                         }
 705                         if (copy_to_user(ctrl.data, tbuf, i)) {
 706                                 free_page((unsigned long)tbuf);
 707                                 return -EFAULT;
 708                         }
 709                 }
 710         } else {
 711                 if (ctrl.wLength) {
 712                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 713                                 free_page((unsigned long)tbuf);
 714                                 return -EFAULT;
 715                         }
 716                 }
 717                 snoop(&dev->dev, "control write: bRequest=%02x "
 718                                 "bRrequestType=%02x wValue=%04x "
 719                                 "wIndex=%04x wLength=%04x\n",
 720                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
 721                                 ctrl.wIndex, ctrl.wLength);
 722                 if (usbfs_snoop) {
 723                         dev_info(&dev->dev, "control write: data: ");
 724                         for (j = 0; j < ctrl.wLength; ++j)
 725                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 726                         printk("\n");
 727                 }
 728                 usb_unlock_device(dev);
 729                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
 730                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 731                                     tbuf, ctrl.wLength, tmo);
 732                 usb_lock_device(dev);
 733         }
 734         free_page((unsigned long)tbuf);
 735         if (i < 0 && i != -EPIPE) {
 736                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 737                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 738                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 739                            ctrl.wLength, i);
 740         }
 741         return i;
 742 }
 743
 744 static int proc_bulk(struct dev_state *ps, void __user *arg)
 745 {
 746         struct usb_device *dev = ps->dev;
 747         struct usbdevfs_bulktransfer bulk;
 748         unsigned int tmo, len1, pipe;
 749         int len2;
 750         unsigned char *tbuf;
 751         int i, j, ret;
 752
 753         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 754                 return -EFAULT;
 755         ret = findintfep(ps->dev, bulk.ep);
 756         if (ret < 0)
 757                 return ret;
 758         ret = checkintf(ps, ret);
 759         if (ret)
 760                 return ret;
 761         if (bulk.ep & USB_DIR_IN)
 762                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 763         else
 764                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 765         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 766                 return -EINVAL;
 767         len1 = bulk.len;
 768         if (len1 > MAX_USBFS_BUFFER_SIZE)
 769                 return -EINVAL;
 770         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 771                 return -ENOMEM;
 772         tmo = bulk.timeout;
 773         if (bulk.ep & 0x80) {
 774                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 775                         kfree(tbuf);
 776                         return -EINVAL;
 777                 }
 778                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
 779                         bulk.len, bulk.timeout);
 780                 usb_unlock_device(dev);
 781                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 782                 usb_lock_device(dev);
 783                 if (!i && len2) {
 784                         if (usbfs_snoop) {
 785                                 dev_info(&dev->dev, "bulk read: data ");
 786                                 for (j = 0; j < len2; ++j)
 787                                         printk("%02x ", (u8)(tbuf)[j]);
 788                                 printk("\n");
 789                         }
 790                         if (copy_to_user(bulk.data, tbuf, len2)) {
 791                                 kfree(tbuf);
 792                                 return -EFAULT;
 793                         }
 794                 }
 795         } else {
 796                 if (len1) {
 797                         if (copy_from_user(tbuf, bulk.data, len1)) {
 798                                 kfree(tbuf);
 799                                 return -EFAULT;
 800                         }
 801                 }
 802                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
 803                         bulk.len, bulk.timeout);
 804                 if (usbfs_snoop) {
 805                         dev_info(&dev->dev, "bulk write: data: ");
 806                         for (j = 0; j < len1; ++j)
 807                                 printk("%02x ", (unsigned char)(tbuf)[j]);
 808                         printk("\n");
 809                 }
 810                 usb_unlock_device(dev);
 811                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 812                 usb_lock_device(dev);
 813         }
 814         kfree(tbuf);
 815         if (i < 0)
 816                 return i;
 817         return len2;
 818 }
 819
 820 static int proc_resetep(struct dev_state *ps, void __user *arg)
 821 {
 822         unsigned int ep;
 823         int ret;
 824
 825         if (get_user(ep, (unsigned int __user *)arg))
 826                 return -EFAULT;
 827         ret = findintfep(ps->dev, ep);
 828         if (ret < 0)
 829                 return ret;
 830         ret = checkintf(ps, ret);
 831         if (ret)
 832                 return ret;
 833         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
 834         return 0;
 835 }
 836
 837 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 838 {
 839         unsigned int ep;
 840         int pipe;
 841         int ret;
 842
 843         if (get_user(ep, (unsigned int __user *)arg))
 844                 return -EFAULT;
 845         ret = findintfep(ps->dev, ep);
 846         if (ret < 0)
 847                 return ret;
 848         ret = checkintf(ps, ret);
 849         if (ret)
 850                 return ret;
 851         if (ep & USB_DIR_IN)
 852                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 853         else
 854                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 855
 856         return usb_clear_halt(ps->dev, pipe);
 857 }
 858
 859 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 860 {
 861         struct usbdevfs_getdriver gd;
 862         struct usb_interface *intf;
 863         int ret;
 864
 865         if (copy_from_user(&gd, arg, sizeof(gd)))
 866                 return -EFAULT;
 867         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 868         if (!intf || !intf->dev.driver)
 869                 ret = -ENODATA;
 870         else {
 871                 strncpy(gd.driver, intf->dev.driver->name,
 872                                 sizeof(gd.driver));
 873                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 874         }
 875         return ret;
 876 }
 877
 878 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 879 {
 880         struct usbdevfs_connectinfo ci;
 881
 882         ci.devnum = ps->dev->devnum;
 883         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 884         if (copy_to_user(arg, &ci, sizeof(ci)))
 885                 return -EFAULT;
 886         return 0;
 887 }
 888
 889 static int proc_resetdevice(struct dev_state *ps)
 890 {
 891         return usb_reset_device(ps->dev);
 892 }
 893
 894 static int proc_setintf(struct dev_state *ps, void __user *arg)
 895 {
 896         struct usbdevfs_setinterface setintf;
 897         int ret;
 898
 899         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 900                 return -EFAULT;
 901         if ((ret = checkintf(ps, setintf.interface)))
 902                 return ret;
 903         return usb_set_interface(ps->dev, setintf.interface,
 904                         setintf.altsetting);
 905 }
 906
 907 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 908 {
 909         int u;
 910         int status = 0;
 911         struct usb_host_config *actconfig;
 912
 913         if (get_user(u, (int __user *)arg))
 914                 return -EFAULT;
 915
 916         actconfig = ps->dev->actconfig;
 917
 918         /* Don't touch the device if any interfaces are claimed.
 919          * It could interfere with other drivers' operations, and if
 920          * an interface is claimed by usbfs it could easily deadlock.
 921          */
 922         if (actconfig) {
 923                 int i;
 924
 925                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 926                         if (usb_interface_claimed(actconfig->interface[i])) {
 927                                 dev_warn(&ps->dev->dev,
 928                                         "usbfs: interface %d claimed by %s "
 929                                         "while '%s' sets config #%d\n",
 930                                         actconfig->interface[i]
 931                                                 ->cur_altsetting
 932                                                 ->desc.bInterfaceNumber,
 933                                         actconfig->interface[i]
 934                                                 ->dev.driver->name,
 935                                         current->comm, u);
 936                                 status = -EBUSY;
 937                                 break;
 938                         }
 939                 }
 940         }
 941
 942         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
 943          * so avoid usb_set_configuration()'s kick to sysfs
 944          */
 945         if (status == 0) {
 946                 if (actconfig && actconfig->desc.bConfigurationValue == u)
 947                         status = usb_reset_configuration(ps->dev);
 948                 else
 949                         status = usb_set_configuration(ps->dev, u);
 950         }
 951
 952         return status;
 953 }
 954
 955 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 956                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
 957                         void __user *arg)
 958 {
 959         struct usbdevfs_iso_packet_desc *isopkt = NULL;
 960         struct usb_host_endpoint *ep;
 961         struct async *as;
 962         struct usb_ctrlrequest *dr = NULL;
 963         unsigned int u, totlen, isofrmlen;
 964         int ret, ifnum = -1;
 965         int is_in;
 966
 967         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
 968                                 USBDEVFS_URB_SHORT_NOT_OK |
 969                                 USBDEVFS_URB_NO_FSBR |
 970                                 USBDEVFS_URB_ZERO_PACKET |
 971                                 USBDEVFS_URB_NO_INTERRUPT))
 972                 return -EINVAL;
 973         if (!uurb->buffer)
 974                 return -EINVAL;
 975         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN ||
 976                                  uurb->signr > SIGRTMAX))
 977                 return -EINVAL;
 978         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
 979             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
 980                 ifnum = findintfep(ps->dev, uurb->endpoint);
 981                 if (ifnum < 0)
 982                         return ifnum;
 983                 ret = checkintf(ps, ifnum);
 984                 if (ret)
 985                         return ret;
 986         }
 987         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
 988                 is_in = 1;
 989                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 990         } else {
 991                 is_in = 0;
 992                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
 993         }
 994         if (!ep)
 995                 return -ENOENT;
 996         switch(uurb->type) {
 997         case USBDEVFS_URB_TYPE_CONTROL:
 998                 if (!usb_endpoint_xfer_control(&ep->desc))
 999                         return -EINVAL;
1000                 /* min 8 byte setup packet,
1001                  * max 8 byte setup plus an arbitrary data stage */
1002                 if (uurb->buffer_length < 8 ||
1003                     uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1004                         return -EINVAL;
1005                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1006                 if (!dr)
1007                         return -ENOMEM;
1008                 if (copy_from_user(dr, uurb->buffer, 8)) {
1009                         kfree(dr);
1010                         return -EFAULT;
1011                 }
1012                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1013                         kfree(dr);
1014                         return -EINVAL;
1015                 }
1016                 ret = check_ctrlrecip(ps, dr->bRequestType,
1017                                       le16_to_cpup(&dr->wIndex));
1018                 if (ret) {
1019                         kfree(dr);
1020                         return ret;
1021                 }
1022                 uurb->number_of_packets = 0;
1023                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1024                 uurb->buffer += 8;
1025                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1026                         is_in = 1;
1027                         uurb->endpoint |= USB_DIR_IN;
1028                 } else {
1029                         is_in = 0;
1030                         uurb->endpoint &= ~USB_DIR_IN;
1031                 }
1032                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1033                                 uurb->buffer, uurb->buffer_length)) {
1034                         kfree(dr);
1035                         return -EFAULT;
1036                 }
1037                 snoop(&ps->dev->dev, "control urb: bRequest=%02x "
1038                         "bRrequestType=%02x wValue=%04x "
1039                         "wIndex=%04x wLength=%04x\n",
1040                         dr->bRequest, dr->bRequestType,
1041                         __le16_to_cpup(&dr->wValue),
1042                         __le16_to_cpup(&dr->wIndex),
1043                         __le16_to_cpup(&dr->wLength));
1044                 break;
1045
1046         case USBDEVFS_URB_TYPE_BULK:
1047                 switch (usb_endpoint_type(&ep->desc)) {
1048                 case USB_ENDPOINT_XFER_CONTROL:
1049                 case USB_ENDPOINT_XFER_ISOC:
1050                         return -EINVAL;
1051                 /* allow single-shot interrupt transfers, at bogus rates */
1052                 }
1053                 uurb->number_of_packets = 0;
1054                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1055                         return -EINVAL;
1056                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1057                                 uurb->buffer, uurb->buffer_length))
1058                         return -EFAULT;
1059                 snoop(&ps->dev->dev, "bulk urb\n");
1060                 break;
1061
1062         case USBDEVFS_URB_TYPE_ISO:
1063                 /* arbitrary limit */
1064                 if (uurb->number_of_packets < 1 ||
1065                     uurb->number_of_packets > 128)
1066                         return -EINVAL;
1067                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1068                         return -EINVAL;
1069                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1070                                    uurb->number_of_packets;
1071                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1072                         return -ENOMEM;
1073                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1074                         kfree(isopkt);
1075                         return -EFAULT;
1076                 }
1077                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1078                         /* arbitrary limit,
1079                          * sufficient for USB 2.0 high-bandwidth iso */
1080                         if (isopkt[u].length > 8192) {
1081                                 kfree(isopkt);
1082                                 return -EINVAL;
1083                         }
1084                         totlen += isopkt[u].length;
1085                 }
1086                 if (totlen > 32768) {
1087                         kfree(isopkt);
1088                         return -EINVAL;
1089                 }
1090                 uurb->buffer_length = totlen;
1091                 snoop(&ps->dev->dev, "iso urb\n");
1092                 break;
1093
1094         case USBDEVFS_URB_TYPE_INTERRUPT:
1095                 uurb->number_of_packets = 0;
1096                 if (!usb_endpoint_xfer_int(&ep->desc))
1097                         return -EINVAL;
1098                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1099                         return -EINVAL;
1100                 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1101                                 uurb->buffer, uurb->buffer_length))
1102                         return -EFAULT;
1103                 snoop(&ps->dev->dev, "interrupt urb\n");
1104                 break;
1105
1106         default:
1107                 return -EINVAL;
1108         }
1109         as = alloc_async(uurb->number_of_packets);
1110         if (!as) {
1111                 kfree(isopkt);
1112                 kfree(dr);
1113                 return -ENOMEM;
1114         }
1115         as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL);
1116         if (!as->urb->transfer_buffer) {
1117                 kfree(isopkt);
1118                 kfree(dr);
1119                 free_async(as);
1120                 return -ENOMEM;
1121         }
1122         as->urb->dev = ps->dev;
1123         as->urb->pipe = (uurb->type << 30) |
1124                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1125                         (uurb->endpoint & USB_DIR_IN);
1126
1127         /* This tedious sequence is necessary because the URB_* flags
1128          * are internal to the kernel and subject to change, whereas
1129          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1130          */
1131         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1132         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1133                 u |= URB_ISO_ASAP;
1134         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1135                 u |= URB_SHORT_NOT_OK;
1136         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1137                 u |= URB_NO_FSBR;
1138         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1139                 u |= URB_ZERO_PACKET;
1140         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1141                 u |= URB_NO_INTERRUPT;
1142         as->urb->transfer_flags = u;
1143
1144         as->urb->transfer_buffer_length = uurb->buffer_length;
1145         as->urb->setup_packet = (unsigned char *)dr;
1146         as->urb->start_frame = uurb->start_frame;
1147         as->urb->number_of_packets = uurb->number_of_packets;
1148         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1149                         ps->dev->speed == USB_SPEED_HIGH)
1150                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1151         else
1152                 as->urb->interval = ep->desc.bInterval;
1153         as->urb->context = as;
1154         as->urb->complete = async_completed;
1155         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1156                 as->urb->iso_frame_desc[u].offset = totlen;
1157                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1158                 totlen += isopkt[u].length;
1159         }
1160         kfree(isopkt);
1161         as->ps = ps;
1162         as->userurb = arg;
1163         if (uurb->endpoint & USB_DIR_IN)
1164                 as->userbuffer = uurb->buffer;
1165         else
1166                 as->userbuffer = NULL;
1167         as->signr = uurb->signr;
1168         as->ifnum = ifnum;
1169         as->pid = get_pid(task_pid(current));
1170         as->uid = current->uid;
1171         as->euid = current->euid;
1172         security_task_getsecid(current, &as->secid);
1173         if (!is_in) {
1174                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1175                                 as->urb->transfer_buffer_length)) {
1176                         free_async(as);
1177                         return -EFAULT;
1178                 }
1179         }
1180         snoop_urb(as->urb, as->userurb);
1181         async_newpending(as);
1182         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1183                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1184                            "usbfs: usb_submit_urb returned %d\n", ret);
1185                 async_removepending(as);
1186                 free_async(as);
1187                 return ret;
1188         }
1189         return 0;
1190 }
1191
1192 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1193 {
1194         struct usbdevfs_urb uurb;
1195
1196         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1197                 return -EFAULT;
1198
1199         return proc_do_submiturb(ps, &uurb,
1200                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1201                         arg);
1202 }
1203
1204 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1205 {
1206         struct async *as;
1207
1208         as = async_getpending(ps, arg);
1209         if (!as)
1210                 return -EINVAL;
1211         usb_kill_urb(as->urb);
1212         return 0;
1213 }
1214
1215 static int processcompl(struct async *as, void __user * __user *arg)
1216 {
1217         struct urb *urb = as->urb;
1218         struct usbdevfs_urb __user *userurb = as->userurb;
1219         void __user *addr = as->userurb;
1220         unsigned int i;
1221
1222         if (as->userbuffer)
1223                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1224                                  urb->transfer_buffer_length))
1225                         return -EFAULT;
1226         if (put_user(as->status, &userurb->status))
1227                 return -EFAULT;
1228         if (put_user(urb->actual_length, &userurb->actual_length))
1229                 return -EFAULT;
1230         if (put_user(urb->error_count, &userurb->error_count))
1231                 return -EFAULT;
1232
1233         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1234                 for (i = 0; i < urb->number_of_packets; i++) {
1235                         if (put_user(urb->iso_frame_desc[i].actual_length,
1236                                      &userurb->iso_frame_desc[i].actual_length))
1237                                 return -EFAULT;
1238                         if (put_user(urb->iso_frame_desc[i].status,
1239                                      &userurb->iso_frame_desc[i].status))
1240                                 return -EFAULT;
1241                 }
1242         }
1243
1244         free_async(as);
1245
1246         if (put_user(addr, (void __user * __user *)arg))
1247                 return -EFAULT;
1248         return 0;
1249 }
1250
1251 static struct async *reap_as(struct dev_state *ps)
1252 {
1253         DECLARE_WAITQUEUE(wait, current);
1254         struct async *as = NULL;
1255         struct usb_device *dev = ps->dev;
1256
1257         add_wait_queue(&ps->wait, &wait);
1258         for (;;) {
1259                 __set_current_state(TASK_INTERRUPTIBLE);
1260                 as = async_getcompleted(ps);
1261                 if (as)
1262                         break;
1263                 if (signal_pending(current))
1264                         break;
1265                 usb_unlock_device(dev);
1266                 schedule();
1267                 usb_lock_device(dev);
1268         }
1269         remove_wait_queue(&ps->wait, &wait);
1270         set_current_state(TASK_RUNNING);
1271         return as;
1272 }
1273
1274 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1275 {
1276         struct async *as = reap_as(ps);
1277         if (as)
1278                 return processcompl(as, (void __user * __user *)arg);
1279         if (signal_pending(current))
1280                 return -EINTR;
1281         return -EIO;
1282 }
1283
1284 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1285 {
1286         struct async *as;
1287
1288         if (!(as = async_getcompleted(ps)))
1289                 return -EAGAIN;
1290         return processcompl(as, (void __user * __user *)arg);
1291 }
1292
1293 #ifdef CONFIG_COMPAT
1294
1295 static int get_urb32(struct usbdevfs_urb *kurb,
1296                      struct usbdevfs_urb32 __user *uurb)
1297 {
1298         __u32  uptr;
1299         if (get_user(kurb->type, &uurb->type) ||
1300             __get_user(kurb->endpoint, &uurb->endpoint) ||
1301             __get_user(kurb->status, &uurb->status) ||
1302             __get_user(kurb->flags, &uurb->flags) ||
1303             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1304             __get_user(kurb->actual_length, &uurb->actual_length) ||
1305             __get_user(kurb->start_frame, &uurb->start_frame) ||
1306             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1307             __get_user(kurb->error_count, &uurb->error_count) ||
1308             __get_user(kurb->signr, &uurb->signr))
1309                 return -EFAULT;
1310
1311         if (__get_user(uptr, &uurb->buffer))
1312                 return -EFAULT;
1313         kurb->buffer = compat_ptr(uptr);
1314         if (__get_user(uptr, &uurb->buffer))
1315                 return -EFAULT;
1316         kurb->usercontext = compat_ptr(uptr);
1317
1318         return 0;
1319 }
1320
1321 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1322 {
1323         struct usbdevfs_urb uurb;
1324
1325         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1326                 return -EFAULT;
1327
1328         return proc_do_submiturb(ps, &uurb,
1329                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1330                         arg);
1331 }
1332
1333 static int processcompl_compat(struct async *as, void __user * __user *arg)
1334 {
1335         struct urb *urb = as->urb;
1336         struct usbdevfs_urb32 __user *userurb = as->userurb;
1337         void __user *addr = as->userurb;
1338         unsigned int i;
1339
1340         if (as->userbuffer)
1341                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1342                                  urb->transfer_buffer_length))
1343                         return -EFAULT;
1344         if (put_user(as->status, &userurb->status))
1345                 return -EFAULT;
1346         if (put_user(urb->actual_length, &userurb->actual_length))
1347                 return -EFAULT;
1348         if (put_user(urb->error_count, &userurb->error_count))
1349                 return -EFAULT;
1350
1351         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1352                 for (i = 0; i < urb->number_of_packets; i++) {
1353                         if (put_user(urb->iso_frame_desc[i].actual_length,
1354                                      &userurb->iso_frame_desc[i].actual_length))
1355                                 return -EFAULT;
1356                         if (put_user(urb->iso_frame_desc[i].status,
1357                                      &userurb->iso_frame_desc[i].status))
1358                                 return -EFAULT;
1359                 }
1360         }
1361
1362         free_async(as);
1363         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1364                 return -EFAULT;
1365         return 0;
1366 }
1367
1368 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1369 {
1370         struct async *as = reap_as(ps);
1371         if (as)
1372                 return processcompl_compat(as, (void __user * __user *)arg);
1373         if (signal_pending(current))
1374                 return -EINTR;
1375         return -EIO;
1376 }
1377
1378 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1379 {
1380         struct async *as;
1381
1382         if (!(as = async_getcompleted(ps)))
1383                 return -EAGAIN;
1384         return processcompl_compat(as, (void __user * __user *)arg);
1385 }
1386
1387 #endif
1388
1389 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1390 {
1391         struct usbdevfs_disconnectsignal ds;
1392
1393         if (copy_from_user(&ds, arg, sizeof(ds)))
1394                 return -EFAULT;
1395         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1396                 return -EINVAL;
1397         ps->discsignr = ds.signr;
1398         ps->disccontext = ds.context;
1399         return 0;
1400 }
1401
1402 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1403 {
1404         unsigned int ifnum;
1405
1406         if (get_user(ifnum, (unsigned int __user *)arg))
1407                 return -EFAULT;
1408         return claimintf(ps, ifnum);
1409 }
1410
1411 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1412 {
1413         unsigned int ifnum;
1414         int ret;
1415
1416         if (get_user(ifnum, (unsigned int __user *)arg))
1417                 return -EFAULT;
1418         if ((ret = releaseintf(ps, ifnum)) < 0)
1419                 return ret;
1420         destroy_async_on_interface (ps, ifnum);
1421         return 0;
1422 }
1423
1424 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1425 {
1426         int                     size;
1427         void                    *buf = NULL;
1428         int                     retval = 0;
1429         struct usb_interface    *intf = NULL;
1430         struct usb_driver       *driver = NULL;
1431
1432         /* alloc buffer */
1433         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1434                 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1435                         return -ENOMEM;
1436                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1437                         if (copy_from_user(buf, ctl->data, size)) {
1438                                 kfree(buf);
1439                                 return -EFAULT;
1440                         }
1441                 } else {
1442                         memset(buf, 0, size);
1443                 }
1444         }
1445
1446         if (!connected(ps)) {
1447                 kfree(buf);
1448                 return -ENODEV;
1449         }
1450
1451         if (ps->dev->state != USB_STATE_CONFIGURED)
1452                 retval = -EHOSTUNREACH;
1453         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1454                 retval = -EINVAL;
1455         else switch (ctl->ioctl_code) {
1456
1457         /* disconnect kernel driver from interface */
1458         case USBDEVFS_DISCONNECT:
1459                 if (intf->dev.driver) {
1460                         driver = to_usb_driver(intf->dev.driver);
1461                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1462                         usb_driver_release_interface(driver, intf);
1463                 } else
1464                         retval = -ENODATA;
1465                 break;
1466
1467         /* let kernel drivers try to (re)bind to the interface */
1468         case USBDEVFS_CONNECT:
1469                 if (!intf->dev.driver)
1470                         retval = device_attach(&intf->dev);
1471                 else
1472                         retval = -EBUSY;
1473                 break;
1474
1475         /* talk directly to the interface's driver */
1476         default:
1477                 if (intf->dev.driver)
1478                         driver = to_usb_driver(intf->dev.driver);
1479                 if (driver == NULL || driver->ioctl == NULL) {
1480                         retval = -ENOTTY;
1481                 } else {
1482                         retval = driver->ioctl(intf, ctl->ioctl_code, buf);
1483                         if (retval == -ENOIOCTLCMD)
1484                                 retval = -ENOTTY;
1485                 }
1486         }
1487
1488         /* cleanup and return */
1489         if (retval >= 0
1490                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1491                         && size > 0
1492                         && copy_to_user(ctl->data, buf, size) != 0)
1493                 retval = -EFAULT;
1494
1495         kfree(buf);
1496         return retval;
1497 }
1498
1499 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1500 {
1501         struct usbdevfs_ioctl   ctrl;
1502
1503         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1504                 return -EFAULT;
1505         return proc_ioctl(ps, &ctrl);
1506 }
1507
1508 #ifdef CONFIG_COMPAT
1509 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1510 {
1511         struct usbdevfs_ioctl32 __user *uioc;
1512         struct usbdevfs_ioctl ctrl;
1513         u32 udata;
1514
1515         uioc = compat_ptr((long)arg);
1516         if (get_user(ctrl.ifno, &uioc->ifno) ||
1517             get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1518             __get_user(udata, &uioc->data))
1519                 return -EFAULT;
1520         ctrl.data = compat_ptr(udata);
1521
1522         return proc_ioctl(ps, &ctrl);
1523 }
1524 #endif
1525
1526 /*
1527  * NOTE:  All requests here that have interface numbers as parameters
1528  * are assuming that somehow the configuration has been prevented from
1529  * changing.  But there's no mechanism to ensure that...
1530  */
1531 static int usbdev_ioctl(struct inode *inode, struct file *file,
1532                         unsigned int cmd, unsigned long arg)
1533 {
1534         struct dev_state *ps = file->private_data;
1535         struct usb_device *dev = ps->dev;
1536         void __user *p = (void __user *)arg;
1537         int ret = -ENOTTY;
1538
1539         if (!(file->f_mode & FMODE_WRITE))
1540                 return -EPERM;
1541         usb_lock_device(dev);
1542         if (!connected(ps)) {
1543                 usb_unlock_device(dev);
1544                 return -ENODEV;
1545         }
1546
1547         switch (cmd) {
1548         case USBDEVFS_CONTROL:
1549                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1550                 ret = proc_control(ps, p);
1551                 if (ret >= 0)
1552                         inode->i_mtime = CURRENT_TIME;
1553                 break;
1554
1555         case USBDEVFS_BULK:
1556                 snoop(&dev->dev, "%s: BULK\n", __func__);
1557                 ret = proc_bulk(ps, p);
1558                 if (ret >= 0)
1559                         inode->i_mtime = CURRENT_TIME;
1560                 break;
1561
1562         case USBDEVFS_RESETEP:
1563                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1564                 ret = proc_resetep(ps, p);
1565                 if (ret >= 0)
1566                         inode->i_mtime = CURRENT_TIME;
1567                 break;
1568
1569         case USBDEVFS_RESET:
1570                 snoop(&dev->dev, "%s: RESET\n", __func__);
1571                 ret = proc_resetdevice(ps);
1572                 break;
1573
1574         case USBDEVFS_CLEAR_HALT:
1575                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1576                 ret = proc_clearhalt(ps, p);
1577                 if (ret >= 0)
1578                         inode->i_mtime = CURRENT_TIME;
1579                 break;
1580
1581         case USBDEVFS_GETDRIVER:
1582                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1583                 ret = proc_getdriver(ps, p);
1584                 break;
1585
1586         case USBDEVFS_CONNECTINFO:
1587                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1588                 ret = proc_connectinfo(ps, p);
1589                 break;
1590
1591         case USBDEVFS_SETINTERFACE:
1592                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1593                 ret = proc_setintf(ps, p);
1594                 break;
1595
1596         case USBDEVFS_SETCONFIGURATION:
1597                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1598                 ret = proc_setconfig(ps, p);
1599                 break;
1600
1601         case USBDEVFS_SUBMITURB:
1602                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1603                 ret = proc_submiturb(ps, p);
1604                 if (ret >= 0)
1605                         inode->i_mtime = CURRENT_TIME;
1606                 break;
1607
1608 #ifdef CONFIG_COMPAT
1609
1610         case USBDEVFS_SUBMITURB32:
1611                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1612                 ret = proc_submiturb_compat(ps, p);
1613                 if (ret >= 0)
1614                         inode->i_mtime = CURRENT_TIME;
1615                 break;
1616
1617         case USBDEVFS_REAPURB32:
1618                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1619                 ret = proc_reapurb_compat(ps, p);
1620                 break;
1621
1622         case USBDEVFS_REAPURBNDELAY32:
1623                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __func__);
1624                 ret = proc_reapurbnonblock_compat(ps, p);
1625                 break;
1626
1627         case USBDEVFS_IOCTL32:
1628                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1629                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1630                 break;
1631 #endif
1632
1633         case USBDEVFS_DISCARDURB:
1634                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1635                 ret = proc_unlinkurb(ps, p);
1636                 break;
1637
1638         case USBDEVFS_REAPURB:
1639                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1640                 ret = proc_reapurb(ps, p);
1641                 break;
1642
1643         case USBDEVFS_REAPURBNDELAY:
1644                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __func__);
1645                 ret = proc_reapurbnonblock(ps, p);
1646                 break;
1647
1648         case USBDEVFS_DISCSIGNAL:
1649                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1650                 ret = proc_disconnectsignal(ps, p);
1651                 break;
1652
1653         case USBDEVFS_CLAIMINTERFACE:
1654                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1655                 ret = proc_claiminterface(ps, p);
1656                 break;
1657
1658         case USBDEVFS_RELEASEINTERFACE:
1659                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1660                 ret = proc_releaseinterface(ps, p);
1661                 break;
1662
1663         case USBDEVFS_IOCTL:
1664                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1665                 ret = proc_ioctl_default(ps, p);
1666                 break;
1667         }
1668         usb_unlock_device(dev);
1669         if (ret >= 0)
1670                 inode->i_atime = CURRENT_TIME;
1671         return ret;
1672 }
1673
1674 /* No kernel lock - fine */
1675 static unsigned int usbdev_poll(struct file *file,
1676                                 struct poll_table_struct *wait)
1677 {
1678         struct dev_state *ps = file->private_data;
1679         unsigned int mask = 0;
1680
1681         poll_wait(file, &ps->wait, wait);
1682         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1683                 mask |= POLLOUT | POLLWRNORM;
1684         if (!connected(ps))
1685                 mask |= POLLERR | POLLHUP;
1686         return mask;
1687 }
1688
1689 const struct file_operations usbdev_file_operations = {
1690         .owner =        THIS_MODULE,
1691         .llseek =       usbdev_lseek,
1692         .read =         usbdev_read,
1693         .poll =         usbdev_poll,
1694         .ioctl =        usbdev_ioctl,
1695         .open =         usbdev_open,
1696         .release =      usbdev_release,
1697 };
1698
1699 void usb_fs_classdev_common_remove(struct usb_device *udev)
1700 {
1701         struct dev_state *ps;
1702         struct siginfo sinfo;
1703
1704         while (!list_empty(&udev->filelist)) {
1705                 ps = list_entry(udev->filelist.next, struct dev_state, list);
1706                 destroy_all_async(ps);
1707                 wake_up_all(&ps->wait);
1708                 list_del_init(&ps->list);
1709                 if (ps->discsignr) {
1710                         sinfo.si_signo = ps->discsignr;
1711                         sinfo.si_errno = EPIPE;
1712                         sinfo.si_code = SI_ASYNCIO;
1713                         sinfo.si_addr = ps->disccontext;
1714                         kill_pid_info_as_uid(ps->discsignr, &sinfo,
1715                                         ps->disc_pid, ps->disc_uid,
1716                                         ps->disc_euid, ps->secid);
1717                 }
1718         }
1719 }
1720
1721 #ifdef CONFIG_USB_DEVICE_CLASS
1722 static struct class *usb_classdev_class;
1723
1724 static int usb_classdev_add(struct usb_device *dev)
1725 {
1726         int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1727
1728         dev->usb_classdev = device_create(usb_classdev_class, &dev->dev,
1729                                 MKDEV(USB_DEVICE_MAJOR, minor),
1730                                 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1731         if (IS_ERR(dev->usb_classdev))
1732                 return PTR_ERR(dev->usb_classdev);
1733
1734         return 0;
1735 }
1736
1737 static void usb_classdev_remove(struct usb_device *dev)
1738 {
1739         device_unregister(dev->usb_classdev);
1740         usb_fs_classdev_common_remove(dev);
1741 }
1742
1743 static int usb_classdev_notify(struct notifier_block *self,
1744                                unsigned long action, void *dev)
1745 {
1746         switch (action) {
1747         case USB_DEVICE_ADD:
1748                 if (usb_classdev_add(dev))
1749                         return NOTIFY_BAD;
1750                 break;
1751         case USB_DEVICE_REMOVE:
1752                 usb_classdev_remove(dev);
1753                 break;
1754         }
1755         return NOTIFY_OK;
1756 }
1757
1758 static struct notifier_block usbdev_nb = {
1759         .notifier_call =        usb_classdev_notify,
1760 };
1761 #endif
1762
1763 static struct cdev usb_device_cdev;
1764
1765 int __init usb_devio_init(void)
1766 {
1767         int retval;
1768
1769         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1770                                         "usb_device");
1771         if (retval) {
1772                 err("unable to register minors for usb_device");
1773                 goto out;
1774         }
1775         cdev_init(&usb_device_cdev, &usbdev_file_operations);
1776         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1777         if (retval) {
1778                 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1779                 goto error_cdev;
1780         }
1781 #ifdef CONFIG_USB_DEVICE_CLASS
1782         usb_classdev_class = class_create(THIS_MODULE, "usb_device");
1783         if (IS_ERR(usb_classdev_class)) {
1784                 err("unable to register usb_device class");
1785                 retval = PTR_ERR(usb_classdev_class);
1786                 cdev_del(&usb_device_cdev);
1787                 usb_classdev_class = NULL;
1788                 goto out;
1789         }
1790
1791         usb_register_notify(&usbdev_nb);
1792 #endif
1793 out:
1794         return retval;
1795
1796 error_cdev:
1797         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1798         goto out;
1799 }
1800
1801 void usb_devio_cleanup(void)
1802 {
1803 #ifdef CONFIG_USB_DEVICE_CLASS
1804         usb_unregister_notify(&usbdev_nb);
1805         class_destroy(usb_classdev_class);
1806 #endif
1807         cdev_del(&usb_device_cdev);
1808         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1809 }