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   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 #include "hub.h"
  56
  57 #define USB_MAXBUS                      64
  58 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
  59
  60 /* Mutual exclusion for removal, open, and release */
  61 DEFINE_MUTEX(usbfs_mutex);
  62
  63 struct dev_state {
  64         struct list_head list;      /* state list */
  65         struct usb_device *dev;
  66         struct file *file;
  67         spinlock_t lock;            /* protects the async urb lists */
  68         struct list_head async_pending;
  69         struct list_head async_completed;
  70         wait_queue_head_t wait;     /* wake up if a request completed */
  71         unsigned int discsignr;
  72         struct pid *disc_pid;
  73         uid_t disc_uid, disc_euid;
  74         void __user *disccontext;
  75         unsigned long ifclaimed;
  76         u32 secid;
  77         u32 disabled_bulk_eps;
  78 };
  79
  80 struct async {
  81         struct list_head asynclist;
  82         struct dev_state *ps;
  83         struct pid *pid;
  84         uid_t uid, euid;
  85         unsigned int signr;
  86         unsigned int ifnum;
  87         void __user *userbuffer;
  88         void __user *userurb;
  89         struct urb *urb;
  90         int status;
  91         u32 secid;
  92         u8 bulk_addr;
  93         u8 bulk_status;
  94 };
  95
  96 static int usbfs_snoop;
  97 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  98 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
  99
 100 #define snoop(dev, format, arg...)                              \
 101         do {                                                    \
 102                 if (usbfs_snoop)                                \
 103                         dev_info(dev , format , ## arg);        \
 104         } while (0)
 105
 106 enum snoop_when {
 107         SUBMIT, COMPLETE
 108 };
 109
 110 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 111
 112 #define MAX_USBFS_BUFFER_SIZE   16384
 113
 114
 115 static int connected(struct dev_state *ps)
 116 {
 117         return (!list_empty(&ps->list) &&
 118                         ps->dev->state != USB_STATE_NOTATTACHED);
 119 }
 120
 121 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
 122 {
 123         loff_t ret;
 124
 125         mutex_lock(&file->f_dentry->d_inode->i_mutex);
 126
 127         switch (orig) {
 128         case 0:
 129                 file->f_pos = offset;
 130                 ret = file->f_pos;
 131                 break;
 132         case 1:
 133                 file->f_pos += offset;
 134                 ret = file->f_pos;
 135                 break;
 136         case 2:
 137         default:
 138                 ret = -EINVAL;
 139         }
 140
 141         mutex_unlock(&file->f_dentry->d_inode->i_mutex);
 142         return ret;
 143 }
 144
 145 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 146                            loff_t *ppos)
 147 {
 148         struct dev_state *ps = file->private_data;
 149         struct usb_device *dev = ps->dev;
 150         ssize_t ret = 0;
 151         unsigned len;
 152         loff_t pos;
 153         int i;
 154
 155         pos = *ppos;
 156         usb_lock_device(dev);
 157         if (!connected(ps)) {
 158                 ret = -ENODEV;
 159                 goto err;
 160         } else if (pos < 0) {
 161                 ret = -EINVAL;
 162                 goto err;
 163         }
 164
 165         if (pos < sizeof(struct usb_device_descriptor)) {
 166                 /* 18 bytes - fits on the stack */
 167                 struct usb_device_descriptor temp_desc;
 168
 169                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 170                 le16_to_cpus(&temp_desc.bcdUSB);
 171                 le16_to_cpus(&temp_desc.idVendor);
 172                 le16_to_cpus(&temp_desc.idProduct);
 173                 le16_to_cpus(&temp_desc.bcdDevice);
 174
 175                 len = sizeof(struct usb_device_descriptor) - pos;
 176                 if (len > nbytes)
 177                         len = nbytes;
 178                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 179                         ret = -EFAULT;
 180                         goto err;
 181                 }
 182
 183                 *ppos += len;
 184                 buf += len;
 185                 nbytes -= len;
 186                 ret += len;
 187         }
 188
 189         pos = sizeof(struct usb_device_descriptor);
 190         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 191                 struct usb_config_descriptor *config =
 192                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 193                 unsigned int length = le16_to_cpu(config->wTotalLength);
 194
 195                 if (*ppos < pos + length) {
 196
 197                         /* The descriptor may claim to be longer than it
 198                          * really is.  Here is the actual allocated length. */
 199                         unsigned alloclen =
 200                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 201
 202                         len = length - (*ppos - pos);
 203                         if (len > nbytes)
 204                                 len = nbytes;
 205
 206                         /* Simply don't write (skip over) unallocated parts */
 207                         if (alloclen > (*ppos - pos)) {
 208                                 alloclen -= (*ppos - pos);
 209                                 if (copy_to_user(buf,
 210                                     dev->rawdescriptors[i] + (*ppos - pos),
 211                                     min(len, alloclen))) {
 212                                         ret = -EFAULT;
 213                                         goto err;
 214                                 }
 215                         }
 216
 217                         *ppos += len;
 218                         buf += len;
 219                         nbytes -= len;
 220                         ret += len;
 221                 }
 222
 223                 pos += length;
 224         }
 225
 226 err:
 227         usb_unlock_device(dev);
 228         return ret;
 229 }
 230
 231 /*
 232  * async list handling
 233  */
 234
 235 static struct async *alloc_async(unsigned int numisoframes)
 236 {
 237         struct async *as;
 238
 239         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 240         if (!as)
 241                 return NULL;
 242         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 243         if (!as->urb) {
 244                 kfree(as);
 245                 return NULL;
 246         }
 247         return as;
 248 }
 249
 250 static void free_async(struct async *as)
 251 {
 252         put_pid(as->pid);
 253         kfree(as->urb->transfer_buffer);
 254         kfree(as->urb->setup_packet);
 255         usb_free_urb(as->urb);
 256         kfree(as);
 257 }
 258
 259 static void async_newpending(struct async *as)
 260 {
 261         struct dev_state *ps = as->ps;
 262         unsigned long flags;
 263
 264         spin_lock_irqsave(&ps->lock, flags);
 265         list_add_tail(&as->asynclist, &ps->async_pending);
 266         spin_unlock_irqrestore(&ps->lock, flags);
 267 }
 268
 269 static void async_removepending(struct async *as)
 270 {
 271         struct dev_state *ps = as->ps;
 272         unsigned long flags;
 273
 274         spin_lock_irqsave(&ps->lock, flags);
 275         list_del_init(&as->asynclist);
 276         spin_unlock_irqrestore(&ps->lock, flags);
 277 }
 278
 279 static struct async *async_getcompleted(struct dev_state *ps)
 280 {
 281         unsigned long flags;
 282         struct async *as = NULL;
 283
 284         spin_lock_irqsave(&ps->lock, flags);
 285         if (!list_empty(&ps->async_completed)) {
 286                 as = list_entry(ps->async_completed.next, struct async,
 287                                 asynclist);
 288                 list_del_init(&as->asynclist);
 289         }
 290         spin_unlock_irqrestore(&ps->lock, flags);
 291         return as;
 292 }
 293
 294 static struct async *async_getpending(struct dev_state *ps,
 295                                              void __user *userurb)
 296 {
 297         unsigned long flags;
 298         struct async *as;
 299
 300         spin_lock_irqsave(&ps->lock, flags);
 301         list_for_each_entry(as, &ps->async_pending, asynclist)
 302                 if (as->userurb == userurb) {
 303                         list_del_init(&as->asynclist);
 304                         spin_unlock_irqrestore(&ps->lock, flags);
 305                         return as;
 306                 }
 307         spin_unlock_irqrestore(&ps->lock, flags);
 308         return NULL;
 309 }
 310
 311 static void snoop_urb(struct usb_device *udev,
 312                 void __user *userurb, int pipe, unsigned length,
 313                 int timeout_or_status, enum snoop_when when,
 314                 unsigned char *data, unsigned data_len)
 315 {
 316         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 317         static const char *dirs[] = {"out", "in"};
 318         int ep;
 319         const char *t, *d;
 320
 321         if (!usbfs_snoop)
 322                 return;
 323
 324         ep = usb_pipeendpoint(pipe);
 325         t = types[usb_pipetype(pipe)];
 326         d = dirs[!!usb_pipein(pipe)];
 327
 328         if (userurb) {          /* Async */
 329                 if (when == SUBMIT)
 330                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 331                                         "length %u\n",
 332                                         userurb, ep, t, d, length);
 333                 else
 334                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 335                                         "actual_length %u status %d\n",
 336                                         userurb, ep, t, d, length,
 337                                         timeout_or_status);
 338         } else {
 339                 if (when == SUBMIT)
 340                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 341                                         "timeout %d\n",
 342                                         ep, t, d, length, timeout_or_status);
 343                 else
 344                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 345                                         "status %d\n",
 346                                         ep, t, d, length, timeout_or_status);
 347         }
 348
 349         if (data && data_len > 0) {
 350                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 351                         data, data_len, 1);
 352         }
 353 }
 354
 355 #define AS_CONTINUATION 1
 356 #define AS_UNLINK       2
 357
 358 static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr)
 359 __releases(ps->lock)
 360 __acquires(ps->lock)
 361 {
 362         struct async *as;
 363
 364         /* Mark all the pending URBs that match bulk_addr, up to but not
 365          * including the first one without AS_CONTINUATION.  If such an
 366          * URB is encountered then a new transfer has already started so
 367          * the endpoint doesn't need to be disabled; otherwise it does.
 368          */
 369         list_for_each_entry(as, &ps->async_pending, asynclist) {
 370                 if (as->bulk_addr == bulk_addr) {
 371                         if (as->bulk_status != AS_CONTINUATION)
 372                                 goto rescan;
 373                         as->bulk_status = AS_UNLINK;
 374                         as->bulk_addr = 0;
 375                 }
 376         }
 377         ps->disabled_bulk_eps |= (1 << bulk_addr);
 378
 379         /* Now carefully unlink all the marked pending URBs */
 380  rescan:
 381         list_for_each_entry(as, &ps->async_pending, asynclist) {
 382                 if (as->bulk_status == AS_UNLINK) {
 383                         as->bulk_status = 0;            /* Only once */
 384                         spin_unlock(&ps->lock);         /* Allow completions */
 385                         usb_unlink_urb(as->urb);
 386                         spin_lock(&ps->lock);
 387                         goto rescan;
 388                 }
 389         }
 390 }
 391
 392 static void async_completed(struct urb *urb)
 393 {
 394         struct async *as = urb->context;
 395         struct dev_state *ps = as->ps;
 396         struct siginfo sinfo;
 397         struct pid *pid = NULL;
 398         uid_t uid = 0;
 399         uid_t euid = 0;
 400         u32 secid = 0;
 401         int signr;
 402
 403         spin_lock(&ps->lock);
 404         list_move_tail(&as->asynclist, &ps->async_completed);
 405         as->status = urb->status;
 406         signr = as->signr;
 407         if (signr) {
 408                 sinfo.si_signo = as->signr;
 409                 sinfo.si_errno = as->status;
 410                 sinfo.si_code = SI_ASYNCIO;
 411                 sinfo.si_addr = as->userurb;
 412                 pid = as->pid;
 413                 uid = as->uid;
 414                 euid = as->euid;
 415                 secid = as->secid;
 416         }
 417         snoop(&urb->dev->dev, "urb complete\n");
 418         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 419                         as->status, COMPLETE,
 420                         ((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_OUT) ?
 421                                 NULL : urb->transfer_buffer, urb->actual_length);
 422         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 423                         as->status != -ENOENT)
 424                 cancel_bulk_urbs(ps, as->bulk_addr);
 425         spin_unlock(&ps->lock);
 426
 427         if (signr)
 428                 kill_pid_info_as_uid(sinfo.si_signo, &sinfo, pid, uid,
 429                                       euid, secid);
 430
 431         wake_up(&ps->wait);
 432 }
 433
 434 static void destroy_async(struct dev_state *ps, struct list_head *list)
 435 {
 436         struct async *as;
 437         unsigned long flags;
 438
 439         spin_lock_irqsave(&ps->lock, flags);
 440         while (!list_empty(list)) {
 441                 as = list_entry(list->next, struct async, asynclist);
 442                 list_del_init(&as->asynclist);
 443
 444                 /* drop the spinlock so the completion handler can run */
 445                 spin_unlock_irqrestore(&ps->lock, flags);
 446                 usb_kill_urb(as->urb);
 447                 spin_lock_irqsave(&ps->lock, flags);
 448         }
 449         spin_unlock_irqrestore(&ps->lock, flags);
 450 }
 451
 452 static void destroy_async_on_interface(struct dev_state *ps,
 453                                        unsigned int ifnum)
 454 {
 455         struct list_head *p, *q, hitlist;
 456         unsigned long flags;
 457
 458         INIT_LIST_HEAD(&hitlist);
 459         spin_lock_irqsave(&ps->lock, flags);
 460         list_for_each_safe(p, q, &ps->async_pending)
 461                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 462                         list_move_tail(p, &hitlist);
 463         spin_unlock_irqrestore(&ps->lock, flags);
 464         destroy_async(ps, &hitlist);
 465 }
 466
 467 static void destroy_all_async(struct dev_state *ps)
 468 {
 469         destroy_async(ps, &ps->async_pending);
 470 }
 471
 472 /*
 473  * interface claims are made only at the request of user level code,
 474  * which can also release them (explicitly or by closing files).
 475  * they're also undone when devices disconnect.
 476  */
 477
 478 static int driver_probe(struct usb_interface *intf,
 479                         const struct usb_device_id *id)
 480 {
 481         return -ENODEV;
 482 }
 483
 484 static void driver_disconnect(struct usb_interface *intf)
 485 {
 486         struct dev_state *ps = usb_get_intfdata(intf);
 487         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 488
 489         if (!ps)
 490                 return;
 491
 492         /* NOTE:  this relies on usbcore having canceled and completed
 493          * all pending I/O requests; 2.6 does that.
 494          */
 495
 496         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 497                 clear_bit(ifnum, &ps->ifclaimed);
 498         else
 499                 dev_warn(&intf->dev, "interface number %u out of range\n",
 500                          ifnum);
 501
 502         usb_set_intfdata(intf, NULL);
 503
 504         /* force async requests to complete */
 505         destroy_async_on_interface(ps, ifnum);
 506 }
 507
 508 /* The following routines are merely placeholders.  There is no way
 509  * to inform a user task about suspend or resumes.
 510  */
 511 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 512 {
 513         return 0;
 514 }
 515
 516 static int driver_resume(struct usb_interface *intf)
 517 {
 518         return 0;
 519 }
 520
 521 struct usb_driver usbfs_driver = {
 522         .name =         "usbfs",
 523         .probe =        driver_probe,
 524         .disconnect =   driver_disconnect,
 525         .suspend =      driver_suspend,
 526         .resume =       driver_resume,
 527 };
 528
 529 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 530 {
 531         struct usb_device *dev = ps->dev;
 532         struct usb_interface *intf;
 533         int err;
 534
 535         if (ifnum >= 8*sizeof(ps->ifclaimed))
 536                 return -EINVAL;
 537         /* already claimed */
 538         if (test_bit(ifnum, &ps->ifclaimed))
 539                 return 0;
 540
 541         intf = usb_ifnum_to_if(dev, ifnum);
 542         if (!intf)
 543                 err = -ENOENT;
 544         else
 545                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 546         if (err == 0)
 547                 set_bit(ifnum, &ps->ifclaimed);
 548         return err;
 549 }
 550
 551 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 552 {
 553         struct usb_device *dev;
 554         struct usb_interface *intf;
 555         int err;
 556
 557         err = -EINVAL;
 558         if (ifnum >= 8*sizeof(ps->ifclaimed))
 559                 return err;
 560         dev = ps->dev;
 561         intf = usb_ifnum_to_if(dev, ifnum);
 562         if (!intf)
 563                 err = -ENOENT;
 564         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 565                 usb_driver_release_interface(&usbfs_driver, intf);
 566                 err = 0;
 567         }
 568         return err;
 569 }
 570
 571 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 572 {
 573         if (ps->dev->state != USB_STATE_CONFIGURED)
 574                 return -EHOSTUNREACH;
 575         if (ifnum >= 8*sizeof(ps->ifclaimed))
 576                 return -EINVAL;
 577         if (test_bit(ifnum, &ps->ifclaimed))
 578                 return 0;
 579         /* if not yet claimed, claim it for the driver */
 580         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 581                  "interface %u before use\n", task_pid_nr(current),
 582                  current->comm, ifnum);
 583         return claimintf(ps, ifnum);
 584 }
 585
 586 static int findintfep(struct usb_device *dev, unsigned int ep)
 587 {
 588         unsigned int i, j, e;
 589         struct usb_interface *intf;
 590         struct usb_host_interface *alts;
 591         struct usb_endpoint_descriptor *endpt;
 592
 593         if (ep & ~(USB_DIR_IN|0xf))
 594                 return -EINVAL;
 595         if (!dev->actconfig)
 596                 return -ESRCH;
 597         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 598                 intf = dev->actconfig->interface[i];
 599                 for (j = 0; j < intf->num_altsetting; j++) {
 600                         alts = &intf->altsetting[j];
 601                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 602                                 endpt = &alts->endpoint[e].desc;
 603                                 if (endpt->bEndpointAddress == ep)
 604                                         return alts->desc.bInterfaceNumber;
 605                         }
 606                 }
 607         }
 608         return -ENOENT;
 609 }
 610
 611 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
 612                            unsigned int index)
 613 {
 614         int ret = 0;
 615
 616         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 617          && ps->dev->state != USB_STATE_ADDRESS
 618          && ps->dev->state != USB_STATE_CONFIGURED)
 619                 return -EHOSTUNREACH;
 620         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 621                 return 0;
 622
 623         index &= 0xff;
 624         switch (requesttype & USB_RECIP_MASK) {
 625         case USB_RECIP_ENDPOINT:
 626                 ret = findintfep(ps->dev, index);
 627                 if (ret >= 0)
 628                         ret = checkintf(ps, ret);
 629                 break;
 630
 631         case USB_RECIP_INTERFACE:
 632                 ret = checkintf(ps, index);
 633                 break;
 634         }
 635         return ret;
 636 }
 637
 638 static int match_devt(struct device *dev, void *data)
 639 {
 640         return dev->devt == (dev_t) (unsigned long) data;
 641 }
 642
 643 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 644 {
 645         struct device *dev;
 646
 647         dev = bus_find_device(&usb_bus_type, NULL,
 648                               (void *) (unsigned long) devt, match_devt);
 649         if (!dev)
 650                 return NULL;
 651         return container_of(dev, struct usb_device, dev);
 652 }
 653
 654 /*
 655  * file operations
 656  */
 657 static int usbdev_open(struct inode *inode, struct file *file)
 658 {
 659         struct usb_device *dev = NULL;
 660         struct dev_state *ps;
 661         const struct cred *cred = current_cred();
 662         int ret;
 663
 664         ret = -ENOMEM;
 665         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
 666         if (!ps)
 667                 goto out_free_ps;
 668
 669         ret = -ENODEV;
 670
 671         /* Protect against simultaneous removal or release */
 672         mutex_lock(&usbfs_mutex);
 673
 674         /* usbdev device-node */
 675         if (imajor(inode) == USB_DEVICE_MAJOR)
 676                 dev = usbdev_lookup_by_devt(inode->i_rdev);
 677
 678 #ifdef CONFIG_USB_DEVICEFS
 679         /* procfs file */
 680         if (!dev) {
 681                 dev = inode->i_private;
 682                 if (dev && dev->usbfs_dentry &&
 683                                         dev->usbfs_dentry->d_inode == inode)
 684                         usb_get_dev(dev);
 685                 else
 686                         dev = NULL;
 687         }
 688 #endif
 689         mutex_unlock(&usbfs_mutex);
 690
 691         if (!dev)
 692                 goto out_free_ps;
 693
 694         usb_lock_device(dev);
 695         if (dev->state == USB_STATE_NOTATTACHED)
 696                 goto out_unlock_device;
 697
 698         ret = usb_autoresume_device(dev);
 699         if (ret)
 700                 goto out_unlock_device;
 701
 702         ps->dev = dev;
 703         ps->file = file;
 704         spin_lock_init(&ps->lock);
 705         INIT_LIST_HEAD(&ps->list);
 706         INIT_LIST_HEAD(&ps->async_pending);
 707         INIT_LIST_HEAD(&ps->async_completed);
 708         init_waitqueue_head(&ps->wait);
 709         ps->discsignr = 0;
 710         ps->disc_pid = get_pid(task_pid(current));
 711         ps->disc_uid = cred->uid;
 712         ps->disc_euid = cred->euid;
 713         ps->disccontext = NULL;
 714         ps->ifclaimed = 0;
 715         security_task_getsecid(current, &ps->secid);
 716         smp_wmb();
 717         list_add_tail(&ps->list, &dev->filelist);
 718         file->private_data = ps;
 719         usb_unlock_device(dev);
 720         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
 721                         current->comm);
 722         return ret;
 723
 724  out_unlock_device:
 725         usb_unlock_device(dev);
 726         usb_put_dev(dev);
 727  out_free_ps:
 728         kfree(ps);
 729         return ret;
 730 }
 731
 732 static int usbdev_release(struct inode *inode, struct file *file)
 733 {
 734         struct dev_state *ps = file->private_data;
 735         struct usb_device *dev = ps->dev;
 736         unsigned int ifnum;
 737         struct async *as;
 738
 739         usb_lock_device(dev);
 740         usb_hub_release_all_ports(dev, ps);
 741
 742         list_del_init(&ps->list);
 743
 744         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 745                         ifnum++) {
 746                 if (test_bit(ifnum, &ps->ifclaimed))
 747                         releaseintf(ps, ifnum);
 748         }
 749         destroy_all_async(ps);
 750         usb_autosuspend_device(dev);
 751         usb_unlock_device(dev);
 752         usb_put_dev(dev);
 753         put_pid(ps->disc_pid);
 754
 755         as = async_getcompleted(ps);
 756         while (as) {
 757                 free_async(as);
 758                 as = async_getcompleted(ps);
 759         }
 760         kfree(ps);
 761         return 0;
 762 }
 763
 764 static int proc_control(struct dev_state *ps, void __user *arg)
 765 {
 766         struct usb_device *dev = ps->dev;
 767         struct usbdevfs_ctrltransfer ctrl;
 768         unsigned int tmo;
 769         unsigned char *tbuf;
 770         unsigned wLength;
 771         int i, pipe, ret;
 772
 773         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 774                 return -EFAULT;
 775         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
 776         if (ret)
 777                 return ret;
 778         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
 779         if (wLength > PAGE_SIZE)
 780                 return -EINVAL;
 781         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
 782         if (!tbuf)
 783                 return -ENOMEM;
 784         tmo = ctrl.timeout;
 785         snoop(&dev->dev, "control urb: bRequestType=%02x "
 786                 "bRequest=%02x wValue=%04x "
 787                 "wIndex=%04x wLength=%04x\n",
 788                 ctrl.bRequestType, ctrl.bRequest,
 789                 __le16_to_cpup(&ctrl.wValue),
 790                 __le16_to_cpup(&ctrl.wIndex),
 791                 __le16_to_cpup(&ctrl.wLength));
 792         if (ctrl.bRequestType & 0x80) {
 793                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
 794                                                ctrl.wLength)) {
 795                         free_page((unsigned long)tbuf);
 796                         return -EINVAL;
 797                 }
 798                 pipe = usb_rcvctrlpipe(dev, 0);
 799                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
 800
 801                 usb_unlock_device(dev);
 802                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
 803                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 804                                     tbuf, ctrl.wLength, tmo);
 805                 usb_lock_device(dev);
 806                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
 807                         tbuf, i);
 808                 if ((i > 0) && ctrl.wLength) {
 809                         if (copy_to_user(ctrl.data, tbuf, i)) {
 810                                 free_page((unsigned long)tbuf);
 811                                 return -EFAULT;
 812                         }
 813                 }
 814         } else {
 815                 if (ctrl.wLength) {
 816                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 817                                 free_page((unsigned long)tbuf);
 818                                 return -EFAULT;
 819                         }
 820                 }
 821                 pipe = usb_sndctrlpipe(dev, 0);
 822                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
 823                         tbuf, ctrl.wLength);
 824
 825                 usb_unlock_device(dev);
 826                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
 827                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 828                                     tbuf, ctrl.wLength, tmo);
 829                 usb_lock_device(dev);
 830                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
 831         }
 832         free_page((unsigned long)tbuf);
 833         if (i < 0 && i != -EPIPE) {
 834                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 835                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 836                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 837                            ctrl.wLength, i);
 838         }
 839         return i;
 840 }
 841
 842 static int proc_bulk(struct dev_state *ps, void __user *arg)
 843 {
 844         struct usb_device *dev = ps->dev;
 845         struct usbdevfs_bulktransfer bulk;
 846         unsigned int tmo, len1, pipe;
 847         int len2;
 848         unsigned char *tbuf;
 849         int i, ret;
 850
 851         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 852                 return -EFAULT;
 853         ret = findintfep(ps->dev, bulk.ep);
 854         if (ret < 0)
 855                 return ret;
 856         ret = checkintf(ps, ret);
 857         if (ret)
 858                 return ret;
 859         if (bulk.ep & USB_DIR_IN)
 860                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 861         else
 862                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 863         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 864                 return -EINVAL;
 865         len1 = bulk.len;
 866         if (len1 > MAX_USBFS_BUFFER_SIZE)
 867                 return -EINVAL;
 868         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 869                 return -ENOMEM;
 870         tmo = bulk.timeout;
 871         if (bulk.ep & 0x80) {
 872                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 873                         kfree(tbuf);
 874                         return -EINVAL;
 875                 }
 876                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
 877
 878                 usb_unlock_device(dev);
 879                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 880                 usb_lock_device(dev);
 881                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
 882
 883                 if (!i && len2) {
 884                         if (copy_to_user(bulk.data, tbuf, len2)) {
 885                                 kfree(tbuf);
 886                                 return -EFAULT;
 887                         }
 888                 }
 889         } else {
 890                 if (len1) {
 891                         if (copy_from_user(tbuf, bulk.data, len1)) {
 892                                 kfree(tbuf);
 893                                 return -EFAULT;
 894                         }
 895                 }
 896                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
 897
 898                 usb_unlock_device(dev);
 899                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 900                 usb_lock_device(dev);
 901                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
 902         }
 903         kfree(tbuf);
 904         if (i < 0)
 905                 return i;
 906         return len2;
 907 }
 908
 909 static int proc_resetep(struct dev_state *ps, void __user *arg)
 910 {
 911         unsigned int ep;
 912         int ret;
 913
 914         if (get_user(ep, (unsigned int __user *)arg))
 915                 return -EFAULT;
 916         ret = findintfep(ps->dev, ep);
 917         if (ret < 0)
 918                 return ret;
 919         ret = checkintf(ps, ret);
 920         if (ret)
 921                 return ret;
 922         usb_reset_endpoint(ps->dev, ep);
 923         return 0;
 924 }
 925
 926 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 927 {
 928         unsigned int ep;
 929         int pipe;
 930         int ret;
 931
 932         if (get_user(ep, (unsigned int __user *)arg))
 933                 return -EFAULT;
 934         ret = findintfep(ps->dev, ep);
 935         if (ret < 0)
 936                 return ret;
 937         ret = checkintf(ps, ret);
 938         if (ret)
 939                 return ret;
 940         if (ep & USB_DIR_IN)
 941                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 942         else
 943                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 944
 945         return usb_clear_halt(ps->dev, pipe);
 946 }
 947
 948 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 949 {
 950         struct usbdevfs_getdriver gd;
 951         struct usb_interface *intf;
 952         int ret;
 953
 954         if (copy_from_user(&gd, arg, sizeof(gd)))
 955                 return -EFAULT;
 956         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 957         if (!intf || !intf->dev.driver)
 958                 ret = -ENODATA;
 959         else {
 960                 strncpy(gd.driver, intf->dev.driver->name,
 961                                 sizeof(gd.driver));
 962                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 963         }
 964         return ret;
 965 }
 966
 967 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 968 {
 969         struct usbdevfs_connectinfo ci;
 970
 971         ci.devnum = ps->dev->devnum;
 972         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 973         if (copy_to_user(arg, &ci, sizeof(ci)))
 974                 return -EFAULT;
 975         return 0;
 976 }
 977
 978 static int proc_resetdevice(struct dev_state *ps)
 979 {
 980         return usb_reset_device(ps->dev);
 981 }
 982
 983 static int proc_setintf(struct dev_state *ps, void __user *arg)
 984 {
 985         struct usbdevfs_setinterface setintf;
 986         int ret;
 987
 988         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 989                 return -EFAULT;
 990         if ((ret = checkintf(ps, setintf.interface)))
 991                 return ret;
 992         return usb_set_interface(ps->dev, setintf.interface,
 993                         setintf.altsetting);
 994 }
 995
 996 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 997 {
 998         int u;
 999         int status = 0;
1000         struct usb_host_config *actconfig;
1001
1002         if (get_user(u, (int __user *)arg))
1003                 return -EFAULT;
1004
1005         actconfig = ps->dev->actconfig;
1006
1007         /* Don't touch the device if any interfaces are claimed.
1008          * It could interfere with other drivers' operations, and if
1009          * an interface is claimed by usbfs it could easily deadlock.
1010          */
1011         if (actconfig) {
1012                 int i;
1013
1014                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1015                         if (usb_interface_claimed(actconfig->interface[i])) {
1016                                 dev_warn(&ps->dev->dev,
1017                                         "usbfs: interface %d claimed by %s "
1018                                         "while '%s' sets config #%d\n",
1019                                         actconfig->interface[i]
1020                                                 ->cur_altsetting
1021                                                 ->desc.bInterfaceNumber,
1022                                         actconfig->interface[i]
1023                                                 ->dev.driver->name,
1024                                         current->comm, u);
1025                                 status = -EBUSY;
1026                                 break;
1027                         }
1028                 }
1029         }
1030
1031         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1032          * so avoid usb_set_configuration()'s kick to sysfs
1033          */
1034         if (status == 0) {
1035                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1036                         status = usb_reset_configuration(ps->dev);
1037                 else
1038                         status = usb_set_configuration(ps->dev, u);
1039         }
1040
1041         return status;
1042 }
1043
1044 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1045                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1046                         void __user *arg)
1047 {
1048         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1049         struct usb_host_endpoint *ep;
1050         struct async *as;
1051         struct usb_ctrlrequest *dr = NULL;
1052         const struct cred *cred = current_cred();
1053         unsigned int u, totlen, isofrmlen;
1054         int ret, ifnum = -1;
1055         int is_in;
1056
1057         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1058                                 USBDEVFS_URB_SHORT_NOT_OK |
1059                                 USBDEVFS_URB_BULK_CONTINUATION |
1060                                 USBDEVFS_URB_NO_FSBR |
1061                                 USBDEVFS_URB_ZERO_PACKET |
1062                                 USBDEVFS_URB_NO_INTERRUPT))
1063                 return -EINVAL;
1064         if (uurb->buffer_length > 0 && !uurb->buffer)
1065                 return -EINVAL;
1066         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1067             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1068                 ifnum = findintfep(ps->dev, uurb->endpoint);
1069                 if (ifnum < 0)
1070                         return ifnum;
1071                 ret = checkintf(ps, ifnum);
1072                 if (ret)
1073                         return ret;
1074         }
1075         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1076                 is_in = 1;
1077                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1078         } else {
1079                 is_in = 0;
1080                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1081         }
1082         if (!ep)
1083                 return -ENOENT;
1084         switch(uurb->type) {
1085         case USBDEVFS_URB_TYPE_CONTROL:
1086                 if (!usb_endpoint_xfer_control(&ep->desc))
1087                         return -EINVAL;
1088                 /* min 8 byte setup packet,
1089                  * max 8 byte setup plus an arbitrary data stage */
1090                 if (uurb->buffer_length < 8 ||
1091                     uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1092                         return -EINVAL;
1093                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1094                 if (!dr)
1095                         return -ENOMEM;
1096                 if (copy_from_user(dr, uurb->buffer, 8)) {
1097                         kfree(dr);
1098                         return -EFAULT;
1099                 }
1100                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1101                         kfree(dr);
1102                         return -EINVAL;
1103                 }
1104                 ret = check_ctrlrecip(ps, dr->bRequestType,
1105                                       le16_to_cpup(&dr->wIndex));
1106                 if (ret) {
1107                         kfree(dr);
1108                         return ret;
1109                 }
1110                 uurb->number_of_packets = 0;
1111                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1112                 uurb->buffer += 8;
1113                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1114                         is_in = 1;
1115                         uurb->endpoint |= USB_DIR_IN;
1116                 } else {
1117                         is_in = 0;
1118                         uurb->endpoint &= ~USB_DIR_IN;
1119                 }
1120                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1121                         "bRequest=%02x wValue=%04x "
1122                         "wIndex=%04x wLength=%04x\n",
1123                         dr->bRequestType, dr->bRequest,
1124                         __le16_to_cpup(&dr->wValue),
1125                         __le16_to_cpup(&dr->wIndex),
1126                         __le16_to_cpup(&dr->wLength));
1127                 break;
1128
1129         case USBDEVFS_URB_TYPE_BULK:
1130                 switch (usb_endpoint_type(&ep->desc)) {
1131                 case USB_ENDPOINT_XFER_CONTROL:
1132                 case USB_ENDPOINT_XFER_ISOC:
1133                         return -EINVAL;
1134                 case USB_ENDPOINT_XFER_INT:
1135                         /* allow single-shot interrupt transfers */
1136                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1137                         goto interrupt_urb;
1138                 }
1139                 uurb->number_of_packets = 0;
1140                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1141                         return -EINVAL;
1142                 break;
1143
1144         case USBDEVFS_URB_TYPE_INTERRUPT:
1145                 if (!usb_endpoint_xfer_int(&ep->desc))
1146                         return -EINVAL;
1147  interrupt_urb:
1148                 uurb->number_of_packets = 0;
1149                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1150                         return -EINVAL;
1151                 break;
1152
1153         case USBDEVFS_URB_TYPE_ISO:
1154                 /* arbitrary limit */
1155                 if (uurb->number_of_packets < 1 ||
1156                     uurb->number_of_packets > 128)
1157                         return -EINVAL;
1158                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1159                         return -EINVAL;
1160                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1161                                    uurb->number_of_packets;
1162                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1163                         return -ENOMEM;
1164                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1165                         kfree(isopkt);
1166                         return -EFAULT;
1167                 }
1168                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1169                         /* arbitrary limit,
1170                          * sufficient for USB 2.0 high-bandwidth iso */
1171                         if (isopkt[u].length > 8192) {
1172                                 kfree(isopkt);
1173                                 return -EINVAL;
1174                         }
1175                         totlen += isopkt[u].length;
1176                 }
1177                 /* 3072 * 64 microframes */
1178                 if (totlen > 196608) {
1179                         kfree(isopkt);
1180                         return -EINVAL;
1181                 }
1182                 uurb->buffer_length = totlen;
1183                 break;
1184
1185         default:
1186                 return -EINVAL;
1187         }
1188         if (uurb->buffer_length > 0 &&
1189                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1190                                 uurb->buffer, uurb->buffer_length)) {
1191                 kfree(isopkt);
1192                 kfree(dr);
1193                 return -EFAULT;
1194         }
1195         as = alloc_async(uurb->number_of_packets);
1196         if (!as) {
1197                 kfree(isopkt);
1198                 kfree(dr);
1199                 return -ENOMEM;
1200         }
1201         if (uurb->buffer_length > 0) {
1202                 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1203                                 GFP_KERNEL);
1204                 if (!as->urb->transfer_buffer) {
1205                         kfree(isopkt);
1206                         kfree(dr);
1207                         free_async(as);
1208                         return -ENOMEM;
1209                 }
1210         }
1211         as->urb->dev = ps->dev;
1212         as->urb->pipe = (uurb->type << 30) |
1213                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1214                         (uurb->endpoint & USB_DIR_IN);
1215
1216         /* This tedious sequence is necessary because the URB_* flags
1217          * are internal to the kernel and subject to change, whereas
1218          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1219          */
1220         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1221         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1222                 u |= URB_ISO_ASAP;
1223         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1224                 u |= URB_SHORT_NOT_OK;
1225         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1226                 u |= URB_NO_FSBR;
1227         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1228                 u |= URB_ZERO_PACKET;
1229         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1230                 u |= URB_NO_INTERRUPT;
1231         as->urb->transfer_flags = u;
1232
1233         as->urb->transfer_buffer_length = uurb->buffer_length;
1234         as->urb->setup_packet = (unsigned char *)dr;
1235         as->urb->start_frame = uurb->start_frame;
1236         as->urb->number_of_packets = uurb->number_of_packets;
1237         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1238                         ps->dev->speed == USB_SPEED_HIGH)
1239                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1240         else
1241                 as->urb->interval = ep->desc.bInterval;
1242         as->urb->context = as;
1243         as->urb->complete = async_completed;
1244         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1245                 as->urb->iso_frame_desc[u].offset = totlen;
1246                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1247                 totlen += isopkt[u].length;
1248         }
1249         kfree(isopkt);
1250         as->ps = ps;
1251         as->userurb = arg;
1252         if (is_in && uurb->buffer_length > 0)
1253                 as->userbuffer = uurb->buffer;
1254         else
1255                 as->userbuffer = NULL;
1256         as->signr = uurb->signr;
1257         as->ifnum = ifnum;
1258         as->pid = get_pid(task_pid(current));
1259         as->uid = cred->uid;
1260         as->euid = cred->euid;
1261         security_task_getsecid(current, &as->secid);
1262         if (!is_in && uurb->buffer_length > 0) {
1263                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1264                                 uurb->buffer_length)) {
1265                         free_async(as);
1266                         return -EFAULT;
1267                 }
1268         }
1269         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1270                         as->urb->transfer_buffer_length, 0, SUBMIT,
1271                         is_in ? NULL : as->urb->transfer_buffer,
1272                                 uurb->buffer_length);
1273         async_newpending(as);
1274
1275         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1276                 spin_lock_irq(&ps->lock);
1277
1278                 /* Not exactly the endpoint address; the direction bit is
1279                  * shifted to the 0x10 position so that the value will be
1280                  * between 0 and 31.
1281                  */
1282                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1283                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1284                                 >> 3);
1285
1286                 /* If this bulk URB is the start of a new transfer, re-enable
1287                  * the endpoint.  Otherwise mark it as a continuation URB.
1288                  */
1289                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1290                         as->bulk_status = AS_CONTINUATION;
1291                 else
1292                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1293
1294                 /* Don't accept continuation URBs if the endpoint is
1295                  * disabled because of an earlier error.
1296                  */
1297                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1298                         ret = -EREMOTEIO;
1299                 else
1300                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1301                 spin_unlock_irq(&ps->lock);
1302         } else {
1303                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1304         }
1305
1306         if (ret) {
1307                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1308                            "usbfs: usb_submit_urb returned %d\n", ret);
1309                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1310                                 0, ret, COMPLETE, NULL, 0);
1311                 async_removepending(as);
1312                 free_async(as);
1313                 return ret;
1314         }
1315         return 0;
1316 }
1317
1318 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1319 {
1320         struct usbdevfs_urb uurb;
1321
1322         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1323                 return -EFAULT;
1324
1325         return proc_do_submiturb(ps, &uurb,
1326                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1327                         arg);
1328 }
1329
1330 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1331 {
1332         struct async *as;
1333
1334         as = async_getpending(ps, arg);
1335         if (!as)
1336                 return -EINVAL;
1337         usb_kill_urb(as->urb);
1338         return 0;
1339 }
1340
1341 static int processcompl(struct async *as, void __user * __user *arg)
1342 {
1343         struct urb *urb = as->urb;
1344         struct usbdevfs_urb __user *userurb = as->userurb;
1345         void __user *addr = as->userurb;
1346         unsigned int i;
1347
1348         if (as->userbuffer && urb->actual_length)
1349                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1350                                  urb->actual_length))
1351                         goto err_out;
1352         if (put_user(as->status, &userurb->status))
1353                 goto err_out;
1354         if (put_user(urb->actual_length, &userurb->actual_length))
1355                 goto err_out;
1356         if (put_user(urb->error_count, &userurb->error_count))
1357                 goto err_out;
1358
1359         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1360                 for (i = 0; i < urb->number_of_packets; i++) {
1361                         if (put_user(urb->iso_frame_desc[i].actual_length,
1362                                      &userurb->iso_frame_desc[i].actual_length))
1363                                 goto err_out;
1364                         if (put_user(urb->iso_frame_desc[i].status,
1365                                      &userurb->iso_frame_desc[i].status))
1366                                 goto err_out;
1367                 }
1368         }
1369
1370         if (put_user(addr, (void __user * __user *)arg))
1371                 return -EFAULT;
1372         return 0;
1373
1374 err_out:
1375         return -EFAULT;
1376 }
1377
1378 static struct async *reap_as(struct dev_state *ps)
1379 {
1380         DECLARE_WAITQUEUE(wait, current);
1381         struct async *as = NULL;
1382         struct usb_device *dev = ps->dev;
1383
1384         add_wait_queue(&ps->wait, &wait);
1385         for (;;) {
1386                 __set_current_state(TASK_INTERRUPTIBLE);
1387                 as = async_getcompleted(ps);
1388                 if (as)
1389                         break;
1390                 if (signal_pending(current))
1391                         break;
1392                 usb_unlock_device(dev);
1393                 schedule();
1394                 usb_lock_device(dev);
1395         }
1396         remove_wait_queue(&ps->wait, &wait);
1397         set_current_state(TASK_RUNNING);
1398         return as;
1399 }
1400
1401 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1402 {
1403         struct async *as = reap_as(ps);
1404         if (as) {
1405                 int retval = processcompl(as, (void __user * __user *)arg);
1406                 free_async(as);
1407                 return retval;
1408         }
1409         if (signal_pending(current))
1410                 return -EINTR;
1411         return -EIO;
1412 }
1413
1414 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1415 {
1416         int retval;
1417         struct async *as;
1418
1419         as = async_getcompleted(ps);
1420         retval = -EAGAIN;
1421         if (as) {
1422                 retval = processcompl(as, (void __user * __user *)arg);
1423                 free_async(as);
1424         }
1425         return retval;
1426 }
1427
1428 #ifdef CONFIG_COMPAT
1429 static int proc_control_compat(struct dev_state *ps,
1430                                 struct usbdevfs_ctrltransfer32 __user *p32)
1431 {
1432         struct usbdevfs_ctrltransfer __user *p;
1433         __u32 udata;
1434         p = compat_alloc_user_space(sizeof(*p));
1435         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1436             get_user(udata, &p32->data) ||
1437             put_user(compat_ptr(udata), &p->data))
1438                 return -EFAULT;
1439         return proc_control(ps, p);
1440 }
1441
1442 static int proc_bulk_compat(struct dev_state *ps,
1443                         struct usbdevfs_bulktransfer32 __user *p32)
1444 {
1445         struct usbdevfs_bulktransfer __user *p;
1446         compat_uint_t n;
1447         compat_caddr_t addr;
1448
1449         p = compat_alloc_user_space(sizeof(*p));
1450
1451         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1452             get_user(n, &p32->len) || put_user(n, &p->len) ||
1453             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1454             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1455                 return -EFAULT;
1456
1457         return proc_bulk(ps, p);
1458 }
1459 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1460 {
1461         struct usbdevfs_disconnectsignal32 ds;
1462
1463         if (copy_from_user(&ds, arg, sizeof(ds)))
1464                 return -EFAULT;
1465         ps->discsignr = ds.signr;
1466         ps->disccontext = compat_ptr(ds.context);
1467         return 0;
1468 }
1469
1470 static int get_urb32(struct usbdevfs_urb *kurb,
1471                      struct usbdevfs_urb32 __user *uurb)
1472 {
1473         __u32  uptr;
1474         if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1475             __get_user(kurb->type, &uurb->type) ||
1476             __get_user(kurb->endpoint, &uurb->endpoint) ||
1477             __get_user(kurb->status, &uurb->status) ||
1478             __get_user(kurb->flags, &uurb->flags) ||
1479             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1480             __get_user(kurb->actual_length, &uurb->actual_length) ||
1481             __get_user(kurb->start_frame, &uurb->start_frame) ||
1482             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1483             __get_user(kurb->error_count, &uurb->error_count) ||
1484             __get_user(kurb->signr, &uurb->signr))
1485                 return -EFAULT;
1486
1487         if (__get_user(uptr, &uurb->buffer))
1488                 return -EFAULT;
1489         kurb->buffer = compat_ptr(uptr);
1490         if (__get_user(uptr, &uurb->usercontext))
1491                 return -EFAULT;
1492         kurb->usercontext = compat_ptr(uptr);
1493
1494         return 0;
1495 }
1496
1497 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1498 {
1499         struct usbdevfs_urb uurb;
1500
1501         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1502                 return -EFAULT;
1503
1504         return proc_do_submiturb(ps, &uurb,
1505                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1506                         arg);
1507 }
1508
1509 static int processcompl_compat(struct async *as, void __user * __user *arg)
1510 {
1511         struct urb *urb = as->urb;
1512         struct usbdevfs_urb32 __user *userurb = as->userurb;
1513         void __user *addr = as->userurb;
1514         unsigned int i;
1515
1516         if (as->userbuffer && urb->actual_length)
1517                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1518                                  urb->actual_length))
1519                         return -EFAULT;
1520         if (put_user(as->status, &userurb->status))
1521                 return -EFAULT;
1522         if (put_user(urb->actual_length, &userurb->actual_length))
1523                 return -EFAULT;
1524         if (put_user(urb->error_count, &userurb->error_count))
1525                 return -EFAULT;
1526
1527         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1528                 for (i = 0; i < urb->number_of_packets; i++) {
1529                         if (put_user(urb->iso_frame_desc[i].actual_length,
1530                                      &userurb->iso_frame_desc[i].actual_length))
1531                                 return -EFAULT;
1532                         if (put_user(urb->iso_frame_desc[i].status,
1533                                      &userurb->iso_frame_desc[i].status))
1534                                 return -EFAULT;
1535                 }
1536         }
1537
1538         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1539                 return -EFAULT;
1540         return 0;
1541 }
1542
1543 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1544 {
1545         struct async *as = reap_as(ps);
1546         if (as) {
1547                 int retval = processcompl_compat(as, (void __user * __user *)arg);
1548                 free_async(as);
1549                 return retval;
1550         }
1551         if (signal_pending(current))
1552                 return -EINTR;
1553         return -EIO;
1554 }
1555
1556 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1557 {
1558         int retval;
1559         struct async *as;
1560
1561         retval = -EAGAIN;
1562         as = async_getcompleted(ps);
1563         if (as) {
1564                 retval = processcompl_compat(as, (void __user * __user *)arg);
1565                 free_async(as);
1566         }
1567         return retval;
1568 }
1569
1570
1571 #endif
1572
1573 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1574 {
1575         struct usbdevfs_disconnectsignal ds;
1576
1577         if (copy_from_user(&ds, arg, sizeof(ds)))
1578                 return -EFAULT;
1579         ps->discsignr = ds.signr;
1580         ps->disccontext = ds.context;
1581         return 0;
1582 }
1583
1584 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1585 {
1586         unsigned int ifnum;
1587
1588         if (get_user(ifnum, (unsigned int __user *)arg))
1589                 return -EFAULT;
1590         return claimintf(ps, ifnum);
1591 }
1592
1593 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1594 {
1595         unsigned int ifnum;
1596         int ret;
1597
1598         if (get_user(ifnum, (unsigned int __user *)arg))
1599                 return -EFAULT;
1600         if ((ret = releaseintf(ps, ifnum)) < 0)
1601                 return ret;
1602         destroy_async_on_interface (ps, ifnum);
1603         return 0;
1604 }
1605
1606 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1607 {
1608         int                     size;
1609         void                    *buf = NULL;
1610         int                     retval = 0;
1611         struct usb_interface    *intf = NULL;
1612         struct usb_driver       *driver = NULL;
1613
1614         /* alloc buffer */
1615         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1616                 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1617                         return -ENOMEM;
1618                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1619                         if (copy_from_user(buf, ctl->data, size)) {
1620                                 kfree(buf);
1621                                 return -EFAULT;
1622                         }
1623                 } else {
1624                         memset(buf, 0, size);
1625                 }
1626         }
1627
1628         if (!connected(ps)) {
1629                 kfree(buf);
1630                 return -ENODEV;
1631         }
1632
1633         if (ps->dev->state != USB_STATE_CONFIGURED)
1634                 retval = -EHOSTUNREACH;
1635         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1636                 retval = -EINVAL;
1637         else switch (ctl->ioctl_code) {
1638
1639         /* disconnect kernel driver from interface */
1640         case USBDEVFS_DISCONNECT:
1641                 if (intf->dev.driver) {
1642                         driver = to_usb_driver(intf->dev.driver);
1643                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1644                         usb_driver_release_interface(driver, intf);
1645                 } else
1646                         retval = -ENODATA;
1647                 break;
1648
1649         /* let kernel drivers try to (re)bind to the interface */
1650         case USBDEVFS_CONNECT:
1651                 if (!intf->dev.driver)
1652                         retval = device_attach(&intf->dev);
1653                 else
1654                         retval = -EBUSY;
1655                 break;
1656
1657         /* talk directly to the interface's driver */
1658         default:
1659                 if (intf->dev.driver)
1660                         driver = to_usb_driver(intf->dev.driver);
1661                 if (driver == NULL || driver->ioctl == NULL) {
1662                         retval = -ENOTTY;
1663                 } else {
1664                         /* keep API that guarantees BKL */
1665                         lock_kernel();
1666                         retval = driver->ioctl(intf, ctl->ioctl_code, buf);
1667                         unlock_kernel();
1668                         if (retval == -ENOIOCTLCMD)
1669                                 retval = -ENOTTY;
1670                 }
1671         }
1672
1673         /* cleanup and return */
1674         if (retval >= 0
1675                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1676                         && size > 0
1677                         && copy_to_user(ctl->data, buf, size) != 0)
1678                 retval = -EFAULT;
1679
1680         kfree(buf);
1681         return retval;
1682 }
1683
1684 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1685 {
1686         struct usbdevfs_ioctl   ctrl;
1687
1688         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1689                 return -EFAULT;
1690         return proc_ioctl(ps, &ctrl);
1691 }
1692
1693 #ifdef CONFIG_COMPAT
1694 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1695 {
1696         struct usbdevfs_ioctl32 __user *uioc;
1697         struct usbdevfs_ioctl ctrl;
1698         u32 udata;
1699
1700         uioc = compat_ptr((long)arg);
1701         if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1702             __get_user(ctrl.ifno, &uioc->ifno) ||
1703             __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1704             __get_user(udata, &uioc->data))
1705                 return -EFAULT;
1706         ctrl.data = compat_ptr(udata);
1707
1708         return proc_ioctl(ps, &ctrl);
1709 }
1710 #endif
1711
1712 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1713 {
1714         unsigned portnum;
1715         int rc;
1716
1717         if (get_user(portnum, (unsigned __user *) arg))
1718                 return -EFAULT;
1719         rc = usb_hub_claim_port(ps->dev, portnum, ps);
1720         if (rc == 0)
1721                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1722                         portnum, task_pid_nr(current), current->comm);
1723         return rc;
1724 }
1725
1726 static int proc_release_port(struct dev_state *ps, void __user *arg)
1727 {
1728         unsigned portnum;
1729
1730         if (get_user(portnum, (unsigned __user *) arg))
1731                 return -EFAULT;
1732         return usb_hub_release_port(ps->dev, portnum, ps);
1733 }
1734
1735 /*
1736  * NOTE:  All requests here that have interface numbers as parameters
1737  * are assuming that somehow the configuration has been prevented from
1738  * changing.  But there's no mechanism to ensure that...
1739  */
1740 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1741                                 void __user *p)
1742 {
1743         struct dev_state *ps = file->private_data;
1744         struct inode *inode = file->f_path.dentry->d_inode;
1745         struct usb_device *dev = ps->dev;
1746         int ret = -ENOTTY;
1747
1748         if (!(file->f_mode & FMODE_WRITE))
1749                 return -EPERM;
1750
1751         usb_lock_device(dev);
1752         if (!connected(ps)) {
1753                 usb_unlock_device(dev);
1754                 return -ENODEV;
1755         }
1756
1757         switch (cmd) {
1758         case USBDEVFS_CONTROL:
1759                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1760                 ret = proc_control(ps, p);
1761                 if (ret >= 0)
1762                         inode->i_mtime = CURRENT_TIME;
1763                 break;
1764
1765         case USBDEVFS_BULK:
1766                 snoop(&dev->dev, "%s: BULK\n", __func__);
1767                 ret = proc_bulk(ps, p);
1768                 if (ret >= 0)
1769                         inode->i_mtime = CURRENT_TIME;
1770                 break;
1771
1772         case USBDEVFS_RESETEP:
1773                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1774                 ret = proc_resetep(ps, p);
1775                 if (ret >= 0)
1776                         inode->i_mtime = CURRENT_TIME;
1777                 break;
1778
1779         case USBDEVFS_RESET:
1780                 snoop(&dev->dev, "%s: RESET\n", __func__);
1781                 ret = proc_resetdevice(ps);
1782                 break;
1783
1784         case USBDEVFS_CLEAR_HALT:
1785                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1786                 ret = proc_clearhalt(ps, p);
1787                 if (ret >= 0)
1788                         inode->i_mtime = CURRENT_TIME;
1789                 break;
1790
1791         case USBDEVFS_GETDRIVER:
1792                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1793                 ret = proc_getdriver(ps, p);
1794                 break;
1795
1796         case USBDEVFS_CONNECTINFO:
1797                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1798                 ret = proc_connectinfo(ps, p);
1799                 break;
1800
1801         case USBDEVFS_SETINTERFACE:
1802                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1803                 ret = proc_setintf(ps, p);
1804                 break;
1805
1806         case USBDEVFS_SETCONFIGURATION:
1807                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1808                 ret = proc_setconfig(ps, p);
1809                 break;
1810
1811         case USBDEVFS_SUBMITURB:
1812                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1813                 ret = proc_submiturb(ps, p);
1814                 if (ret >= 0)
1815                         inode->i_mtime = CURRENT_TIME;
1816                 break;
1817
1818 #ifdef CONFIG_COMPAT
1819         case USBDEVFS_CONTROL32:
1820                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
1821                 ret = proc_control_compat(ps, p);
1822                 if (ret >= 0)
1823                         inode->i_mtime = CURRENT_TIME;
1824                 break;
1825
1826         case USBDEVFS_BULK32:
1827                 snoop(&dev->dev, "%s: BULK32\n", __func__);
1828                 ret = proc_bulk_compat(ps, p);
1829                 if (ret >= 0)
1830                         inode->i_mtime = CURRENT_TIME;
1831                 break;
1832
1833         case USBDEVFS_DISCSIGNAL32:
1834                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
1835                 ret = proc_disconnectsignal_compat(ps, p);
1836                 break;
1837
1838         case USBDEVFS_SUBMITURB32:
1839                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1840                 ret = proc_submiturb_compat(ps, p);
1841                 if (ret >= 0)
1842                         inode->i_mtime = CURRENT_TIME;
1843                 break;
1844
1845         case USBDEVFS_REAPURB32:
1846                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1847                 ret = proc_reapurb_compat(ps, p);
1848                 break;
1849
1850         case USBDEVFS_REAPURBNDELAY32:
1851                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
1852                 ret = proc_reapurbnonblock_compat(ps, p);
1853                 break;
1854
1855         case USBDEVFS_IOCTL32:
1856                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
1857                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1858                 break;
1859 #endif
1860
1861         case USBDEVFS_DISCARDURB:
1862                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1863                 ret = proc_unlinkurb(ps, p);
1864                 break;
1865
1866         case USBDEVFS_REAPURB:
1867                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1868                 ret = proc_reapurb(ps, p);
1869                 break;
1870
1871         case USBDEVFS_REAPURBNDELAY:
1872                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
1873                 ret = proc_reapurbnonblock(ps, p);
1874                 break;
1875
1876         case USBDEVFS_DISCSIGNAL:
1877                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1878                 ret = proc_disconnectsignal(ps, p);
1879                 break;
1880
1881         case USBDEVFS_CLAIMINTERFACE:
1882                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1883                 ret = proc_claiminterface(ps, p);
1884                 break;
1885
1886         case USBDEVFS_RELEASEINTERFACE:
1887                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1888                 ret = proc_releaseinterface(ps, p);
1889                 break;
1890
1891         case USBDEVFS_IOCTL:
1892                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1893                 ret = proc_ioctl_default(ps, p);
1894                 break;
1895
1896         case USBDEVFS_CLAIM_PORT:
1897                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
1898                 ret = proc_claim_port(ps, p);
1899                 break;
1900
1901         case USBDEVFS_RELEASE_PORT:
1902                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
1903                 ret = proc_release_port(ps, p);
1904                 break;
1905         }
1906         usb_unlock_device(dev);
1907         if (ret >= 0)
1908                 inode->i_atime = CURRENT_TIME;
1909         return ret;
1910 }
1911
1912 static long usbdev_ioctl(struct file *file, unsigned int cmd,
1913                         unsigned long arg)
1914 {
1915         int ret;
1916
1917         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
1918
1919         return ret;
1920 }
1921
1922 #ifdef CONFIG_COMPAT
1923 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
1924                         unsigned long arg)
1925 {
1926         int ret;
1927
1928         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
1929
1930         return ret;
1931 }
1932 #endif
1933
1934 /* No kernel lock - fine */
1935 static unsigned int usbdev_poll(struct file *file,
1936                                 struct poll_table_struct *wait)
1937 {
1938         struct dev_state *ps = file->private_data;
1939         unsigned int mask = 0;
1940
1941         poll_wait(file, &ps->wait, wait);
1942         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1943                 mask |= POLLOUT | POLLWRNORM;
1944         if (!connected(ps))
1945                 mask |= POLLERR | POLLHUP;
1946         return mask;
1947 }
1948
1949 const struct file_operations usbdev_file_operations = {
1950         .owner =          THIS_MODULE,
1951         .llseek =         usbdev_lseek,
1952         .read =           usbdev_read,
1953         .poll =           usbdev_poll,
1954         .unlocked_ioctl = usbdev_ioctl,
1955 #ifdef CONFIG_COMPAT
1956         .compat_ioctl =   usbdev_compat_ioctl,
1957 #endif
1958         .open =           usbdev_open,
1959         .release =        usbdev_release,
1960 };
1961
1962 static void usbdev_remove(struct usb_device *udev)
1963 {
1964         struct dev_state *ps;
1965         struct siginfo sinfo;
1966
1967         while (!list_empty(&udev->filelist)) {
1968                 ps = list_entry(udev->filelist.next, struct dev_state, list);
1969                 destroy_all_async(ps);
1970                 wake_up_all(&ps->wait);
1971                 list_del_init(&ps->list);
1972                 if (ps->discsignr) {
1973                         sinfo.si_signo = ps->discsignr;
1974                         sinfo.si_errno = EPIPE;
1975                         sinfo.si_code = SI_ASYNCIO;
1976                         sinfo.si_addr = ps->disccontext;
1977                         kill_pid_info_as_uid(ps->discsignr, &sinfo,
1978                                         ps->disc_pid, ps->disc_uid,
1979                                         ps->disc_euid, ps->secid);
1980                 }
1981         }
1982 }
1983
1984 #ifdef CONFIG_USB_DEVICE_CLASS
1985 static struct class *usb_classdev_class;
1986
1987 static int usb_classdev_add(struct usb_device *dev)
1988 {
1989         struct device *cldev;
1990
1991         cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
1992                               NULL, "usbdev%d.%d", dev->bus->busnum,
1993                               dev->devnum);
1994         if (IS_ERR(cldev))
1995                 return PTR_ERR(cldev);
1996         dev->usb_classdev = cldev;
1997         return 0;
1998 }
1999
2000 static void usb_classdev_remove(struct usb_device *dev)
2001 {
2002         if (dev->usb_classdev)
2003                 device_unregister(dev->usb_classdev);
2004 }
2005
2006 #else
2007 #define usb_classdev_add(dev)           0
2008 #define usb_classdev_remove(dev)        do {} while (0)
2009
2010 #endif
2011
2012 static int usbdev_notify(struct notifier_block *self,
2013                                unsigned long action, void *dev)
2014 {
2015         switch (action) {
2016         case USB_DEVICE_ADD:
2017                 if (usb_classdev_add(dev))
2018                         return NOTIFY_BAD;
2019                 break;
2020         case USB_DEVICE_REMOVE:
2021                 usb_classdev_remove(dev);
2022                 usbdev_remove(dev);
2023                 break;
2024         }
2025         return NOTIFY_OK;
2026 }
2027
2028 static struct notifier_block usbdev_nb = {
2029         .notifier_call =        usbdev_notify,
2030 };
2031
2032 static struct cdev usb_device_cdev;
2033
2034 int __init usb_devio_init(void)
2035 {
2036         int retval;
2037
2038         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2039                                         "usb_device");
2040         if (retval) {
2041                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2042                 goto out;
2043         }
2044         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2045         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2046         if (retval) {
2047                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2048                        USB_DEVICE_MAJOR);
2049                 goto error_cdev;
2050         }
2051 #ifdef CONFIG_USB_DEVICE_CLASS
2052         usb_classdev_class = class_create(THIS_MODULE, "usb_device");
2053         if (IS_ERR(usb_classdev_class)) {
2054                 printk(KERN_ERR "Unable to register usb_device class\n");
2055                 retval = PTR_ERR(usb_classdev_class);
2056                 cdev_del(&usb_device_cdev);
2057                 usb_classdev_class = NULL;
2058                 goto out;
2059         }
2060         /* devices of this class shadow the major:minor of their parent
2061          * device, so clear ->dev_kobj to prevent adding duplicate entries
2062          * to /sys/dev
2063          */
2064         usb_classdev_class->dev_kobj = NULL;
2065 #endif
2066         usb_register_notify(&usbdev_nb);
2067 out:
2068         return retval;
2069
2070 error_cdev:
2071         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2072         goto out;
2073 }
2074
2075 void usb_devio_cleanup(void)
2076 {
2077         usb_unregister_notify(&usbdev_nb);
2078 #ifdef CONFIG_USB_DEVICE_CLASS
2079         class_destroy(usb_classdev_class);
2080 #endif
2081         cdev_del(&usb_device_cdev);
2082         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2083 }