git.maemo.org Git - h-e-n/blob - drivers/usb/class/cdc-wdm.c

   1 /*
   2  * cdc-wdm.c
   3  *
   4  * This driver supports USB CDC WCM Device Management.
   5  *
   6  * Copyright (c) 2007-2008 Oliver Neukum
   7  *
   8  * Some code taken from cdc-acm.c
   9  *
  10  * Released under the GPLv2.
  11  *
  12  * Many thanks to Carl Nordbeck
  13  */
  14 #include <linux/kernel.h>
  15 #include <linux/errno.h>
  16 #include <linux/slab.h>
  17 #include <linux/module.h>
  18 #include <linux/smp_lock.h>
  19 #include <linux/mutex.h>
  20 #include <linux/uaccess.h>
  21 #include <linux/bitops.h>
  22 #include <linux/poll.h>
  23 #include <linux/usb.h>
  24 #include <linux/usb/cdc.h>
  25 #include <asm/byteorder.h>
  26 #include <asm/unaligned.h>
  27
  28 /*
  29  * Version Information
  30  */
  31 #define DRIVER_VERSION "v0.03"
  32 #define DRIVER_AUTHOR "Oliver Neukum"
  33 #define DRIVER_DESC "USB Abstract Control Model driver for USB WCM Device Management"
  34
  35 static struct usb_device_id wdm_ids[] = {
  36         {
  37                 .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS |
  38                                  USB_DEVICE_ID_MATCH_INT_SUBCLASS,
  39                 .bInterfaceClass = USB_CLASS_COMM,
  40                 .bInterfaceSubClass = USB_CDC_SUBCLASS_DMM
  41         },
  42         { }
  43 };
  44
  45 #define WDM_MINOR_BASE  176
  46
  47
  48 #define WDM_IN_USE              1
  49 #define WDM_DISCONNECTING       2
  50 #define WDM_RESULT              3
  51 #define WDM_READ                4
  52 #define WDM_INT_STALL           5
  53 #define WDM_POLL_RUNNING        6
  54
  55
  56 #define WDM_MAX                 16
  57
  58
  59 static DEFINE_MUTEX(wdm_mutex);
  60
  61 /* --- method tables --- */
  62
  63 struct wdm_device {
  64         u8                      *inbuf; /* buffer for response */
  65         u8                      *outbuf; /* buffer for command */
  66         u8                      *sbuf; /* buffer for status */
  67         u8                      *ubuf; /* buffer for copy to user space */
  68
  69         struct urb              *command;
  70         struct urb              *response;
  71         struct urb              *validity;
  72         struct usb_interface    *intf;
  73         struct usb_ctrlrequest  *orq;
  74         struct usb_ctrlrequest  *irq;
  75         spinlock_t              iuspin;
  76
  77         unsigned long           flags;
  78         u16                     bufsize;
  79         u16                     wMaxCommand;
  80         u16                     wMaxPacketSize;
  81         u16                     bMaxPacketSize0;
  82         __le16                  inum;
  83         int                     reslength;
  84         int                     length;
  85         int                     read;
  86         int                     count;
  87         dma_addr_t              shandle;
  88         dma_addr_t              ihandle;
  89         struct mutex            wlock;
  90         struct mutex            rlock;
  91         wait_queue_head_t       wait;
  92         struct work_struct      rxwork;
  93         int                     werr;
  94         int                     rerr;
  95 };
  96
  97 static struct usb_driver wdm_driver;
  98
  99 /* --- callbacks --- */
 100 static void wdm_out_callback(struct urb *urb)
 101 {
 102         struct wdm_device *desc;
 103         desc = urb->context;
 104         spin_lock(&desc->iuspin);
 105         desc->werr = urb->status;
 106         spin_unlock(&desc->iuspin);
 107         clear_bit(WDM_IN_USE, &desc->flags);
 108         kfree(desc->outbuf);
 109         wake_up(&desc->wait);
 110 }
 111
 112 static void wdm_in_callback(struct urb *urb)
 113 {
 114         struct wdm_device *desc = urb->context;
 115         int status = urb->status;
 116
 117         spin_lock(&desc->iuspin);
 118
 119         if (status) {
 120                 switch (status) {
 121                 case -ENOENT:
 122                         dev_dbg(&desc->intf->dev,
 123                                 "nonzero urb status received: -ENOENT");
 124                         break;
 125                 case -ECONNRESET:
 126                         dev_dbg(&desc->intf->dev,
 127                                 "nonzero urb status received: -ECONNRESET");
 128                         break;
 129                 case -ESHUTDOWN:
 130                         dev_dbg(&desc->intf->dev,
 131                                 "nonzero urb status received: -ESHUTDOWN");
 132                         break;
 133                 case -EPIPE:
 134                         err("nonzero urb status received: -EPIPE");
 135                         break;
 136                 default:
 137                         err("Unexpected error %d", status);
 138                         break;
 139                 }
 140         }
 141
 142         desc->rerr = status;
 143         desc->reslength = urb->actual_length;
 144         memmove(desc->ubuf + desc->length, desc->inbuf, desc->reslength);
 145         desc->length += desc->reslength;
 146         wake_up(&desc->wait);
 147
 148         set_bit(WDM_READ, &desc->flags);
 149         spin_unlock(&desc->iuspin);
 150 }
 151
 152 static void wdm_int_callback(struct urb *urb)
 153 {
 154         int rv = 0;
 155         int status = urb->status;
 156         struct wdm_device *desc;
 157         struct usb_ctrlrequest *req;
 158         struct usb_cdc_notification *dr;
 159
 160         desc = urb->context;
 161         req = desc->irq;
 162         dr = (struct usb_cdc_notification *)desc->sbuf;
 163
 164         if (status) {
 165                 switch (status) {
 166                 case -ESHUTDOWN:
 167                 case -ENOENT:
 168                 case -ECONNRESET:
 169                         return; /* unplug */
 170                 case -EPIPE:
 171                         set_bit(WDM_INT_STALL, &desc->flags);
 172                         err("Stall on int endpoint");
 173                         goto sw; /* halt is cleared in work */
 174                 default:
 175                         err("nonzero urb status received: %d", status);
 176                         break;
 177                 }
 178         }
 179
 180         if (urb->actual_length < sizeof(struct usb_cdc_notification)) {
 181                 err("wdm_int_callback - %d bytes", urb->actual_length);
 182                 goto exit;
 183         }
 184
 185         switch (dr->bNotificationType) {
 186         case USB_CDC_NOTIFY_RESPONSE_AVAILABLE:
 187                 dev_dbg(&desc->intf->dev,
 188                         "NOTIFY_RESPONSE_AVAILABLE received: index %d len %d",
 189                         dr->wIndex, dr->wLength);
 190                 break;
 191
 192         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 193
 194                 dev_dbg(&desc->intf->dev,
 195                         "NOTIFY_NETWORK_CONNECTION %s network",
 196                         dr->wValue ? "connected to" : "disconnected from");
 197                 goto exit;
 198         default:
 199                 clear_bit(WDM_POLL_RUNNING, &desc->flags);
 200                 err("unknown notification %d received: index %d len %d",
 201                         dr->bNotificationType, dr->wIndex, dr->wLength);
 202                 goto exit;
 203         }
 204
 205         req->bRequestType = (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE);
 206         req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
 207         req->wValue = 0;
 208         req->wIndex = desc->inum;
 209         req->wLength = cpu_to_le16(desc->wMaxCommand);
 210
 211         usb_fill_control_urb(
 212                 desc->response,
 213                 interface_to_usbdev(desc->intf),
 214                 /* using common endpoint 0 */
 215                 usb_rcvctrlpipe(interface_to_usbdev(desc->intf), 0),
 216                 (unsigned char *)req,
 217                 desc->inbuf,
 218                 desc->wMaxCommand,
 219                 wdm_in_callback,
 220                 desc
 221         );
 222         desc->response->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 223         spin_lock(&desc->iuspin);
 224         clear_bit(WDM_READ, &desc->flags);
 225         if (!test_bit(WDM_DISCONNECTING, &desc->flags)) {
 226                 rv = usb_submit_urb(desc->response, GFP_ATOMIC);
 227                 dev_dbg(&desc->intf->dev, "%s: usb_submit_urb %d",
 228                         __func__, rv);
 229         }
 230         spin_unlock(&desc->iuspin);
 231         if (rv < 0) {
 232                 if (rv == -EPERM)
 233                         return;
 234                 if (rv == -ENOMEM) {
 235 sw:
 236                         rv = schedule_work(&desc->rxwork);
 237                         if (rv)
 238                                 err("Cannot schedule work");
 239                 }
 240         }
 241 exit:
 242         rv = usb_submit_urb(urb, GFP_ATOMIC);
 243         if (rv)
 244                 err("%s - usb_submit_urb failed with result %d",
 245                      __func__, rv);
 246
 247 }
 248
 249 static void kill_urbs(struct wdm_device *desc)
 250 {
 251         usb_kill_urb(desc->command);
 252         usb_kill_urb(desc->validity);
 253         usb_kill_urb(desc->response);
 254 }
 255
 256 static void free_urbs(struct wdm_device *desc)
 257 {
 258         usb_free_urb(desc->validity);
 259         usb_free_urb(desc->response);
 260         usb_free_urb(desc->command);
 261 }
 262
 263 static void cleanup(struct wdm_device *desc)
 264 {
 265         usb_buffer_free(interface_to_usbdev(desc->intf),
 266                         desc->wMaxPacketSize,
 267                         desc->sbuf,
 268                         desc->validity->transfer_dma);
 269         usb_buffer_free(interface_to_usbdev(desc->intf),
 270                         desc->wMaxCommand,
 271                         desc->inbuf,
 272                         desc->response->transfer_dma);
 273         kfree(desc->orq);
 274         kfree(desc->irq);
 275         kfree(desc->ubuf);
 276         free_urbs(desc);
 277         kfree(desc);
 278 }
 279
 280 static ssize_t wdm_write
 281 (struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
 282 {
 283         u8 *buf;
 284         int rv = -EMSGSIZE, r, we;
 285         struct wdm_device *desc = file->private_data;
 286         struct usb_ctrlrequest *req;
 287
 288         if (count > desc->wMaxCommand)
 289                 count = desc->wMaxCommand;
 290
 291         spin_lock_irq(&desc->iuspin);
 292         we = desc->werr;
 293         desc->werr = 0;
 294         spin_unlock_irq(&desc->iuspin);
 295         if (we < 0)
 296                 return -EIO;
 297
 298         r = mutex_lock_interruptible(&desc->wlock); /* concurrent writes */
 299         rv = -ERESTARTSYS;
 300         if (r)
 301                 goto outnl;
 302
 303         r = wait_event_interruptible(desc->wait, !test_bit(WDM_IN_USE,
 304                                                            &desc->flags));
 305         if (r < 0)
 306                 goto out;
 307
 308         if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
 309                 rv = -ENODEV;
 310                 goto out;
 311         }
 312
 313         desc->outbuf = buf = kmalloc(count, GFP_KERNEL);
 314         if (!buf) {
 315                 rv = -ENOMEM;
 316                 goto out;
 317         }
 318
 319         r = copy_from_user(buf, buffer, count);
 320         if (r > 0) {
 321                 kfree(buf);
 322                 rv = -EFAULT;
 323                 goto out;
 324         }
 325
 326         req = desc->orq;
 327         usb_fill_control_urb(
 328                 desc->command,
 329                 interface_to_usbdev(desc->intf),
 330                 /* using common endpoint 0 */
 331                 usb_sndctrlpipe(interface_to_usbdev(desc->intf), 0),
 332                 (unsigned char *)req,
 333                 buf,
 334                 count,
 335                 wdm_out_callback,
 336                 desc
 337         );
 338
 339         req->bRequestType = (USB_DIR_OUT | USB_TYPE_CLASS |
 340                              USB_RECIP_INTERFACE);
 341         req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND;
 342         req->wValue = 0;
 343         req->wIndex = desc->inum;
 344         req->wLength = cpu_to_le16(count);
 345         set_bit(WDM_IN_USE, &desc->flags);
 346
 347         rv = usb_submit_urb(desc->command, GFP_KERNEL);
 348         if (rv < 0) {
 349                 kfree(buf);
 350                 clear_bit(WDM_IN_USE, &desc->flags);
 351                 err("Tx URB error: %d", rv);
 352         } else {
 353                 dev_dbg(&desc->intf->dev, "Tx URB has been submitted index=%d",
 354                         req->wIndex);
 355         }
 356 out:
 357         mutex_unlock(&desc->wlock);
 358 outnl:
 359         return rv < 0 ? rv : count;
 360 }
 361
 362 static ssize_t wdm_read
 363 (struct file *file, char __user *buffer, size_t count, loff_t *ppos)
 364 {
 365         int rv, cntr;
 366         int i = 0;
 367         struct wdm_device *desc = file->private_data;
 368
 369
 370         rv = mutex_lock_interruptible(&desc->rlock); /*concurrent reads */
 371         if (rv < 0)
 372                 return -ERESTARTSYS;
 373
 374         if (desc->length == 0) {
 375                 desc->read = 0;
 376 retry:
 377                 i++;
 378                 rv = wait_event_interruptible(desc->wait,
 379                                               test_bit(WDM_READ, &desc->flags));
 380
 381                 if (rv < 0) {
 382                         rv = -ERESTARTSYS;
 383                         goto err;
 384                 }
 385
 386                 spin_lock_irq(&desc->iuspin);
 387
 388                 if (desc->rerr) { /* read completed, error happened */
 389                         int t = desc->rerr;
 390                         desc->rerr = 0;
 391                         spin_unlock_irq(&desc->iuspin);
 392                         err("reading had resulted in %d", t);
 393                         rv = -EIO;
 394                         goto err;
 395                 }
 396                 /*
 397                  * recheck whether we've lost the race
 398                  * against the completion handler
 399                  */
 400                 if (!test_bit(WDM_READ, &desc->flags)) { /* lost race */
 401                         spin_unlock_irq(&desc->iuspin);
 402                         goto retry;
 403                 }
 404                 if (!desc->reslength) { /* zero length read */
 405                         spin_unlock_irq(&desc->iuspin);
 406                         goto retry;
 407                 }
 408                 clear_bit(WDM_READ, &desc->flags);
 409                 spin_unlock_irq(&desc->iuspin);
 410         }
 411
 412         cntr = count > desc->length ? desc->length : count;
 413         rv = copy_to_user(buffer, desc->ubuf, cntr);
 414         if (rv > 0) {
 415                 rv = -EFAULT;
 416                 goto err;
 417         }
 418
 419         for (i = 0; i < desc->length - cntr; i++)
 420                 desc->ubuf[i] = desc->ubuf[i + cntr];
 421
 422         desc->length -= cntr;
 423         /* in case we had outstanding data */
 424         if (!desc->length)
 425                 clear_bit(WDM_READ, &desc->flags);
 426         rv = cntr;
 427
 428 err:
 429         mutex_unlock(&desc->rlock);
 430         if (rv < 0)
 431                 err("wdm_read: exit error");
 432         return rv;
 433 }
 434
 435 static int wdm_flush(struct file *file, fl_owner_t id)
 436 {
 437         struct wdm_device *desc = file->private_data;
 438
 439         wait_event(desc->wait, !test_bit(WDM_IN_USE, &desc->flags));
 440         if (desc->werr < 0)
 441                 err("Error in flush path: %d", desc->werr);
 442
 443         return desc->werr;
 444 }
 445
 446 static unsigned int wdm_poll(struct file *file, struct poll_table_struct *wait)
 447 {
 448         struct wdm_device *desc = file->private_data;
 449         unsigned long flags;
 450         unsigned int mask = 0;
 451
 452         spin_lock_irqsave(&desc->iuspin, flags);
 453         if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
 454                 mask = POLLERR;
 455                 spin_unlock_irqrestore(&desc->iuspin, flags);
 456                 goto desc_out;
 457         }
 458         if (test_bit(WDM_READ, &desc->flags))
 459                 mask = POLLIN | POLLRDNORM;
 460         if (desc->rerr || desc->werr)
 461                 mask |= POLLERR;
 462         if (!test_bit(WDM_IN_USE, &desc->flags))
 463                 mask |= POLLOUT | POLLWRNORM;
 464         spin_unlock_irqrestore(&desc->iuspin, flags);
 465
 466         poll_wait(file, &desc->wait, wait);
 467
 468 desc_out:
 469         return mask;
 470 }
 471
 472 static int wdm_open(struct inode *inode, struct file *file)
 473 {
 474         int minor = iminor(inode);
 475         int rv = -ENODEV;
 476         struct usb_interface *intf;
 477         struct wdm_device *desc;
 478
 479         mutex_lock(&wdm_mutex);
 480         intf = usb_find_interface(&wdm_driver, minor);
 481         if (!intf)
 482                 goto out;
 483
 484         desc = usb_get_intfdata(intf);
 485         if (test_bit(WDM_DISCONNECTING, &desc->flags))
 486                 goto out;
 487
 488         desc->count++;
 489         file->private_data = desc;
 490
 491         rv = usb_submit_urb(desc->validity, GFP_KERNEL);
 492
 493         if (rv < 0) {
 494                 desc->count--;
 495                 err("Error submitting int urb - %d", rv);
 496                 goto out;
 497         }
 498         rv = 0;
 499
 500 out:
 501         mutex_unlock(&wdm_mutex);
 502         return rv;
 503 }
 504
 505 static int wdm_release(struct inode *inode, struct file *file)
 506 {
 507         struct wdm_device *desc = file->private_data;
 508
 509         mutex_lock(&wdm_mutex);
 510         desc->count--;
 511         if (!desc->count) {
 512                 dev_dbg(&desc->intf->dev, "wdm_release: cleanup");
 513                 kill_urbs(desc);
 514         }
 515         mutex_unlock(&wdm_mutex);
 516         return 0;
 517 }
 518
 519 static const struct file_operations wdm_fops = {
 520         .owner =        THIS_MODULE,
 521         .read =         wdm_read,
 522         .write =        wdm_write,
 523         .open =         wdm_open,
 524         .flush =        wdm_flush,
 525         .release =      wdm_release,
 526         .poll =         wdm_poll
 527 };
 528
 529 static struct usb_class_driver wdm_class = {
 530         .name =         "cdc-wdm%d",
 531         .fops =         &wdm_fops,
 532         .minor_base =   WDM_MINOR_BASE,
 533 };
 534
 535 /* --- error handling --- */
 536 static void wdm_rxwork(struct work_struct *work)
 537 {
 538         struct wdm_device *desc = container_of(work, struct wdm_device, rxwork);
 539         unsigned long flags;
 540         int rv;
 541
 542         spin_lock_irqsave(&desc->iuspin, flags);
 543         if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
 544                 spin_unlock_irqrestore(&desc->iuspin, flags);
 545         } else {
 546                 spin_unlock_irqrestore(&desc->iuspin, flags);
 547                 rv = usb_submit_urb(desc->response, GFP_KERNEL);
 548                 if (rv < 0 && rv != -EPERM) {
 549                         spin_lock_irqsave(&desc->iuspin, flags);
 550                         if (!test_bit(WDM_DISCONNECTING, &desc->flags))
 551                                 schedule_work(&desc->rxwork);
 552                         spin_unlock_irqrestore(&desc->iuspin, flags);
 553                 }
 554         }
 555 }
 556
 557 /* --- hotplug --- */
 558
 559 static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id)
 560 {
 561         int rv = -EINVAL;
 562         struct usb_device *udev = interface_to_usbdev(intf);
 563         struct wdm_device *desc;
 564         struct usb_host_interface *iface;
 565         struct usb_endpoint_descriptor *ep;
 566         struct usb_cdc_dmm_desc *dmhd;
 567         u8 *buffer = intf->altsetting->extra;
 568         int buflen = intf->altsetting->extralen;
 569         u16 maxcom = 0;
 570
 571         if (!buffer)
 572                 goto out;
 573
 574         while (buflen > 0) {
 575                 if (buffer [1] != USB_DT_CS_INTERFACE) {
 576                         err("skipping garbage");
 577                         goto next_desc;
 578                 }
 579
 580                 switch (buffer [2]) {
 581                 case USB_CDC_HEADER_TYPE:
 582                         break;
 583                 case USB_CDC_DMM_TYPE:
 584                         dmhd = (struct usb_cdc_dmm_desc *)buffer;
 585                         maxcom = le16_to_cpu(dmhd->wMaxCommand);
 586                         dev_dbg(&intf->dev,
 587                                 "Finding maximum buffer length: %d", maxcom);
 588                         break;
 589                 default:
 590                         err("Ignoring extra header, type %d, length %d",
 591                                 buffer[2], buffer[0]);
 592                         break;
 593                 }
 594 next_desc:
 595                 buflen -= buffer[0];
 596                 buffer += buffer[0];
 597         }
 598
 599         rv = -ENOMEM;
 600         desc = kzalloc(sizeof(struct wdm_device), GFP_KERNEL);
 601         if (!desc)
 602                 goto out;
 603         mutex_init(&desc->wlock);
 604         mutex_init(&desc->rlock);
 605         spin_lock_init(&desc->iuspin);
 606         init_waitqueue_head(&desc->wait);
 607         desc->wMaxCommand = maxcom;
 608         desc->inum = cpu_to_le16((u16)intf->cur_altsetting->desc.bInterfaceNumber);
 609         desc->intf = intf;
 610         INIT_WORK(&desc->rxwork, wdm_rxwork);
 611
 612         iface = &intf->altsetting[0];
 613         ep = &iface->endpoint[0].desc;
 614         if (!usb_endpoint_is_int_in(ep)) {
 615                 rv = -EINVAL;
 616                 goto err;
 617         }
 618
 619         desc->wMaxPacketSize = le16_to_cpu(ep->wMaxPacketSize);
 620         desc->bMaxPacketSize0 = udev->descriptor.bMaxPacketSize0;
 621
 622         desc->orq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
 623         if (!desc->orq)
 624                 goto err;
 625         desc->irq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
 626         if (!desc->irq)
 627                 goto err;
 628
 629         desc->validity = usb_alloc_urb(0, GFP_KERNEL);
 630         if (!desc->validity)
 631                 goto err;
 632
 633         desc->response = usb_alloc_urb(0, GFP_KERNEL);
 634         if (!desc->response)
 635                 goto err;
 636
 637         desc->command = usb_alloc_urb(0, GFP_KERNEL);
 638         if (!desc->command)
 639                 goto err;
 640
 641         desc->ubuf = kmalloc(desc->wMaxCommand, GFP_KERNEL);
 642         if (!desc->ubuf)
 643                 goto err;
 644
 645         desc->sbuf = usb_buffer_alloc(interface_to_usbdev(intf),
 646                                         desc->wMaxPacketSize,
 647                                         GFP_KERNEL,
 648                                         &desc->validity->transfer_dma);
 649         if (!desc->sbuf)
 650                 goto err;
 651
 652         desc->inbuf = usb_buffer_alloc(interface_to_usbdev(intf),
 653                                         desc->bMaxPacketSize0,
 654                                         GFP_KERNEL,
 655                                         &desc->response->transfer_dma);
 656         if (!desc->inbuf)
 657                 goto err2;
 658
 659         usb_fill_int_urb(
 660                 desc->validity,
 661                 interface_to_usbdev(intf),
 662                 usb_rcvintpipe(interface_to_usbdev(intf), ep->bEndpointAddress),
 663                 desc->sbuf,
 664                 desc->wMaxPacketSize,
 665                 wdm_int_callback,
 666                 desc,
 667                 ep->bInterval
 668         );
 669         desc->validity->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 670
 671         usb_set_intfdata(intf, desc);
 672         rv = usb_register_dev(intf, &wdm_class);
 673         dev_info(&intf->dev, "cdc-wdm%d: USB WDM device\n",
 674                  intf->minor - WDM_MINOR_BASE);
 675         if (rv < 0)
 676                 goto err;
 677 out:
 678         return rv;
 679 err2:
 680         usb_buffer_free(interface_to_usbdev(desc->intf),
 681                         desc->wMaxPacketSize,
 682                         desc->sbuf,
 683                         desc->validity->transfer_dma);
 684 err:
 685         free_urbs(desc);
 686         kfree(desc->ubuf);
 687         kfree(desc->orq);
 688         kfree(desc->irq);
 689         kfree(desc);
 690         return rv;
 691 }
 692
 693 static void wdm_disconnect(struct usb_interface *intf)
 694 {
 695         struct wdm_device *desc;
 696         unsigned long flags;
 697
 698         usb_deregister_dev(intf, &wdm_class);
 699         mutex_lock(&wdm_mutex);
 700         desc = usb_get_intfdata(intf);
 701
 702         /* the spinlock makes sure no new urbs are generated in the callbacks */
 703         spin_lock_irqsave(&desc->iuspin, flags);
 704         set_bit(WDM_DISCONNECTING, &desc->flags);
 705         set_bit(WDM_READ, &desc->flags);
 706         clear_bit(WDM_IN_USE, &desc->flags);
 707         spin_unlock_irqrestore(&desc->iuspin, flags);
 708         cancel_work_sync(&desc->rxwork);
 709         kill_urbs(desc);
 710         wake_up_all(&desc->wait);
 711         if (!desc->count)
 712                 cleanup(desc);
 713         mutex_unlock(&wdm_mutex);
 714 }
 715
 716 static struct usb_driver wdm_driver = {
 717         .name =         "cdc_wdm",
 718         .probe =        wdm_probe,
 719         .disconnect =   wdm_disconnect,
 720         .id_table =     wdm_ids,
 721 };
 722
 723 /* --- low level module stuff --- */
 724
 725 static int __init wdm_init(void)
 726 {
 727         int rv;
 728
 729         rv = usb_register(&wdm_driver);
 730
 731         return rv;
 732 }
 733
 734 static void __exit wdm_exit(void)
 735 {
 736         usb_deregister(&wdm_driver);
 737 }
 738
 739 module_init(wdm_init);
 740 module_exit(wdm_exit);
 741
 742 MODULE_AUTHOR(DRIVER_AUTHOR);
 743 MODULE_DESCRIPTION(DRIVER_DESC);
 744 MODULE_LICENSE("GPL");