release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/net/usb/cdc_ether.c

   1 /*
   2  * CDC Ethernet based networking peripherals
   3  * Copyright (C) 2003-2005 by David Brownell
   4  * Copyright (C) 2006 by Ole Andre Vadla Ravnas (ActiveSync)
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 // #define      DEBUG                   // error path messages, extra info
  22 // #define      VERBOSE                 // more; success messages
  23
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/netdevice.h>
  27 #include <linux/etherdevice.h>
  28 #include <linux/ethtool.h>
  29 #include <linux/workqueue.h>
  30 #include <linux/mii.h>
  31 #include <linux/usb.h>
  32 #include <linux/usb/cdc.h>
  33 #include <linux/usb/usbnet.h>
  34
  35
  36 #if defined(CONFIG_USB_NET_RNDIS_HOST) || defined(CONFIG_USB_NET_RNDIS_HOST_MODULE)
  37
  38 static int is_rndis(struct usb_interface_descriptor *desc)
  39 {
  40         return (desc->bInterfaceClass == USB_CLASS_COMM &&
  41                 desc->bInterfaceSubClass == 2 &&
  42                 desc->bInterfaceProtocol == 0xff);
  43 }
  44
  45 static int is_activesync(struct usb_interface_descriptor *desc)
  46 {
  47         return (desc->bInterfaceClass == USB_CLASS_MISC &&
  48                 desc->bInterfaceSubClass == 1 &&
  49                 desc->bInterfaceProtocol == 1);
  50 }
  51
  52 static int is_wireless_rndis(struct usb_interface_descriptor *desc)
  53 {
  54         return (desc->bInterfaceClass == USB_CLASS_WIRELESS_CONTROLLER &&
  55                 desc->bInterfaceSubClass == 1 &&
  56                 desc->bInterfaceProtocol == 3);
  57 }
  58
  59 #else
  60
  61 #define is_rndis(desc)          0
  62 #define is_activesync(desc)     0
  63 #define is_wireless_rndis(desc) 0
  64
  65 #endif
  66
  67 static const u8 mbm_guid[16] = {
  68         0xa3, 0x17, 0xa8, 0x8b, 0x04, 0x5e, 0x4f, 0x01,
  69         0xa6, 0x07, 0xc0, 0xff, 0xcb, 0x7e, 0x39, 0x2a,
  70 };
  71
  72 /*
  73  * probes control interface, claims data interface, collects the bulk
  74  * endpoints, activates data interface (if needed), maybe sets MTU.
  75  * all pure cdc, except for certain firmware workarounds, and knowing
  76  * that rndis uses one different rule.
  77  */
  78 int usbnet_generic_cdc_bind(struct usbnet *dev, struct usb_interface *intf)
  79 {
  80         u8                              *buf = intf->cur_altsetting->extra;
  81         int                             len = intf->cur_altsetting->extralen;
  82         struct usb_interface_descriptor *d;
  83         struct cdc_state                *info = (void *) &dev->data;
  84         int                             status;
  85         int                             rndis;
  86         struct usb_driver               *driver = driver_of(intf);
  87         struct usb_cdc_mdlm_desc        *desc = NULL;
  88         struct usb_cdc_mdlm_detail_desc *detail = NULL;
  89
  90         if (sizeof dev->data < sizeof *info)
  91                 return -EDOM;
  92
  93         /* expect strict spec conformance for the descriptors, but
  94          * cope with firmware which stores them in the wrong place
  95          */
  96         if (len == 0 && dev->udev->actconfig->extralen) {
  97                 /* Motorola SB4100 (and others: Brad Hards says it's
  98                  * from a Broadcom design) put CDC descriptors here
  99                  */
 100                 buf = dev->udev->actconfig->extra;
 101                 len = dev->udev->actconfig->extralen;
 102                 if (len)
 103                         dev_dbg(&intf->dev,
 104                                 "CDC descriptors on config\n");
 105         }
 106
 107         /* Maybe CDC descriptors are after the endpoint?  This bug has
 108          * been seen on some 2Wire Inc RNDIS-ish products.
 109          */
 110         if (len == 0) {
 111                 struct usb_host_endpoint        *hep;
 112
 113                 hep = intf->cur_altsetting->endpoint;
 114                 if (hep) {
 115                         buf = hep->extra;
 116                         len = hep->extralen;
 117                 }
 118                 if (len)
 119                         dev_dbg(&intf->dev,
 120                                 "CDC descriptors on endpoint\n");
 121         }
 122
 123         /* this assumes that if there's a non-RNDIS vendor variant
 124          * of cdc-acm, it'll fail RNDIS requests cleanly.
 125          */
 126         rndis = (is_rndis(&intf->cur_altsetting->desc) ||
 127                  is_activesync(&intf->cur_altsetting->desc) ||
 128                  is_wireless_rndis(&intf->cur_altsetting->desc));
 129
 130         memset(info, 0, sizeof *info);
 131         info->control = intf;
 132         while (len > 3) {
 133                 if (buf [1] != USB_DT_CS_INTERFACE)
 134                         goto next_desc;
 135
 136                 /* use bDescriptorSubType to identify the CDC descriptors.
 137                  * We expect devices with CDC header and union descriptors.
 138                  * For CDC Ethernet we need the ethernet descriptor.
 139                  * For RNDIS, ignore two (pointless) CDC modem descriptors
 140                  * in favor of a complicated OID-based RPC scheme doing what
 141                  * CDC Ethernet achieves with a simple descriptor.
 142                  */
 143                 switch (buf [2]) {
 144                 case USB_CDC_HEADER_TYPE:
 145                         if (info->header) {
 146                                 dev_dbg(&intf->dev, "extra CDC header\n");
 147                                 goto bad_desc;
 148                         }
 149                         info->header = (void *) buf;
 150                         if (info->header->bLength != sizeof *info->header) {
 151                                 dev_dbg(&intf->dev, "CDC header len %u\n",
 152                                         info->header->bLength);
 153                                 goto bad_desc;
 154                         }
 155                         break;
 156                 case USB_CDC_ACM_TYPE:
 157                         /* paranoia:  disambiguate a "real" vendor-specific
 158                          * modem interface from an RNDIS non-modem.
 159                          */
 160                         if (rndis) {
 161                                 struct usb_cdc_acm_descriptor *acm;
 162
 163                                 acm = (void *) buf;
 164                                 if (acm->bmCapabilities) {
 165                                         dev_dbg(&intf->dev,
 166                                                 "ACM capabilities %02x, "
 167                                                 "not really RNDIS?\n",
 168                                                 acm->bmCapabilities);
 169                                         goto bad_desc;
 170                                 }
 171                         }
 172                         break;
 173                 case USB_CDC_UNION_TYPE:
 174                         if (info->u) {
 175                                 dev_dbg(&intf->dev, "extra CDC union\n");
 176                                 goto bad_desc;
 177                         }
 178                         info->u = (void *) buf;
 179                         if (info->u->bLength != sizeof *info->u) {
 180                                 dev_dbg(&intf->dev, "CDC union len %u\n",
 181                                         info->u->bLength);
 182                                 goto bad_desc;
 183                         }
 184
 185                         /* we need a master/control interface (what we're
 186                          * probed with) and a slave/data interface; union
 187                          * descriptors sort this all out.
 188                          */
 189                         info->control = usb_ifnum_to_if(dev->udev,
 190                                                 info->u->bMasterInterface0);
 191                         info->data = usb_ifnum_to_if(dev->udev,
 192                                                 info->u->bSlaveInterface0);
 193                         if (!info->control || !info->data) {
 194                                 dev_dbg(&intf->dev,
 195                                         "master #%u/%p slave #%u/%p\n",
 196                                         info->u->bMasterInterface0,
 197                                         info->control,
 198                                         info->u->bSlaveInterface0,
 199                                         info->data);
 200                                 goto bad_desc;
 201                         }
 202                         if (info->control != intf) {
 203                                 dev_dbg(&intf->dev, "bogus CDC Union\n");
 204                                 /* Ambit USB Cable Modem (and maybe others)
 205                                  * interchanges master and slave interface.
 206                                  */
 207                                 if (info->data == intf) {
 208                                         info->data = info->control;
 209                                         info->control = intf;
 210                                 } else
 211                                         goto bad_desc;
 212                         }
 213
 214                         /* a data interface altsetting does the real i/o */
 215                         d = &info->data->cur_altsetting->desc;
 216                         if (d->bInterfaceClass != USB_CLASS_CDC_DATA) {
 217                                 dev_dbg(&intf->dev, "slave class %u\n",
 218                                         d->bInterfaceClass);
 219                                 goto bad_desc;
 220                         }
 221                         break;
 222                 case USB_CDC_ETHERNET_TYPE:
 223                         if (info->ether) {
 224                                 dev_dbg(&intf->dev, "extra CDC ether\n");
 225                                 goto bad_desc;
 226                         }
 227                         info->ether = (void *) buf;
 228                         if (info->ether->bLength != sizeof *info->ether) {
 229                                 dev_dbg(&intf->dev, "CDC ether len %u\n",
 230                                         info->ether->bLength);
 231                                 goto bad_desc;
 232                         }
 233                         dev->hard_mtu = le16_to_cpu(
 234                                                 info->ether->wMaxSegmentSize);
 235                         /* because of Zaurus, we may be ignoring the host
 236                          * side link address we were given.
 237                          */
 238                         break;
 239                 case USB_CDC_MDLM_TYPE:
 240                         if (desc) {
 241                                 dev_dbg(&intf->dev, "extra MDLM descriptor\n");
 242                                 goto bad_desc;
 243                         }
 244
 245                         desc = (void *)buf;
 246
 247                         if (desc->bLength != sizeof(*desc))
 248                                 goto bad_desc;
 249
 250                         if (memcmp(&desc->bGUID, mbm_guid, 16))
 251                                 goto bad_desc;
 252                         break;
 253                 case USB_CDC_MDLM_DETAIL_TYPE:
 254                         if (detail) {
 255                                 dev_dbg(&intf->dev, "extra MDLM detail descriptor\n");
 256                                 goto bad_desc;
 257                         }
 258
 259                         detail = (void *)buf;
 260
 261                         if (detail->bGuidDescriptorType == 0) {
 262                                 if (detail->bLength < (sizeof(*detail) + 1))
 263                                         goto bad_desc;
 264                         } else
 265                                 goto bad_desc;
 266                         break;
 267                 }
 268 next_desc:
 269                 len -= buf [0]; /* bLength */
 270                 buf += buf [0];
 271         }
 272
 273         /* Microsoft ActiveSync based and some regular RNDIS devices lack the
 274          * CDC descriptors, so we'll hard-wire the interfaces and not check
 275          * for descriptors.
 276          */
 277         if (rndis && !info->u) {
 278                 info->control = usb_ifnum_to_if(dev->udev, 0);
 279                 info->data = usb_ifnum_to_if(dev->udev, 1);
 280                 if (!info->control || !info->data) {
 281                         dev_dbg(&intf->dev,
 282                                 "rndis: master #0/%p slave #1/%p\n",
 283                                 info->control,
 284                                 info->data);
 285                         goto bad_desc;
 286                 }
 287
 288         } else if (!info->header || !info->u || (!rndis && !info->ether)) {
 289                 dev_dbg(&intf->dev, "missing cdc %s%s%sdescriptor\n",
 290                         info->header ? "" : "header ",
 291                         info->u ? "" : "union ",
 292                         info->ether ? "" : "ether ");
 293                 goto bad_desc;
 294         }
 295
 296         /* claim data interface and set it up ... with side effects.
 297          * network traffic can't flow until an altsetting is enabled.
 298          */
 299         status = usb_driver_claim_interface(driver, info->data, dev);
 300         if (status < 0)
 301                 return status;
 302         status = usbnet_get_endpoints(dev, info->data);
 303         if (status < 0) {
 304                 /* ensure immediate exit from usbnet_disconnect */
 305                 usb_set_intfdata(info->data, NULL);
 306                 usb_driver_release_interface(driver, info->data);
 307                 return status;
 308         }
 309
 310         /* status endpoint: optional for CDC Ethernet, not RNDIS (or ACM) */
 311         dev->status = NULL;
 312         if (info->control->cur_altsetting->desc.bNumEndpoints == 1) {
 313                 struct usb_endpoint_descriptor  *desc;
 314
 315                 dev->status = &info->control->cur_altsetting->endpoint [0];
 316                 desc = &dev->status->desc;
 317                 if (!usb_endpoint_is_int_in(desc) ||
 318                     (le16_to_cpu(desc->wMaxPacketSize)
 319                      < sizeof(struct usb_cdc_notification)) ||
 320                     !desc->bInterval) {
 321                         dev_dbg(&intf->dev, "bad notification endpoint\n");
 322                         dev->status = NULL;
 323                 }
 324         }
 325         if (rndis && !dev->status) {
 326                 dev_dbg(&intf->dev, "missing RNDIS status endpoint\n");
 327                 usb_set_intfdata(info->data, NULL);
 328                 usb_driver_release_interface(driver, info->data);
 329                 return -ENODEV;
 330         }
 331         return 0;
 332
 333 bad_desc:
 334         dev_info(&dev->udev->dev, "bad CDC descriptors\n");
 335         return -ENODEV;
 336 }
 337 EXPORT_SYMBOL_GPL(usbnet_generic_cdc_bind);
 338
 339 void usbnet_cdc_unbind(struct usbnet *dev, struct usb_interface *intf)
 340 {
 341         struct cdc_state                *info = (void *) &dev->data;
 342         struct usb_driver               *driver = driver_of(intf);
 343
 344         /* disconnect master --> disconnect slave */
 345         if (intf == info->control && info->data) {
 346                 /* ensure immediate exit from usbnet_disconnect */
 347                 usb_set_intfdata(info->data, NULL);
 348                 usb_driver_release_interface(driver, info->data);
 349                 info->data = NULL;
 350         }
 351
 352         /* and vice versa (just in case) */
 353         else if (intf == info->data && info->control) {
 354                 /* ensure immediate exit from usbnet_disconnect */
 355                 usb_set_intfdata(info->control, NULL);
 356                 usb_driver_release_interface(driver, info->control);
 357                 info->control = NULL;
 358         }
 359 }
 360 EXPORT_SYMBOL_GPL(usbnet_cdc_unbind);
 361
 362 /*-------------------------------------------------------------------------
 363  *
 364  * Communications Device Class, Ethernet Control model
 365  *
 366  * Takes two interfaces.  The DATA interface is inactive till an altsetting
 367  * is selected.  Configuration data includes class descriptors.  There's
 368  * an optional status endpoint on the control interface.
 369  *
 370  * This should interop with whatever the 2.4 "CDCEther.c" driver
 371  * (by Brad Hards) talked with, with more functionality.
 372  *
 373  *-------------------------------------------------------------------------*/
 374
 375 static void dumpspeed(struct usbnet *dev, __le32 *speeds)
 376 {
 377         netif_info(dev, timer, dev->net,
 378                    "link speeds: %u kbps up, %u kbps down\n",
 379                    __le32_to_cpu(speeds[0]) / 1000,
 380                    __le32_to_cpu(speeds[1]) / 1000);
 381 }
 382
 383 static void cdc_status(struct usbnet *dev, struct urb *urb)
 384 {
 385         struct usb_cdc_notification     *event;
 386
 387         if (urb->actual_length < sizeof *event)
 388                 return;
 389
 390         /* SPEED_CHANGE can get split into two 8-byte packets */
 391         if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
 392                 dumpspeed(dev, (__le32 *) urb->transfer_buffer);
 393                 return;
 394         }
 395
 396         event = urb->transfer_buffer;
 397         switch (event->bNotificationType) {
 398         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 399                 netif_dbg(dev, timer, dev->net, "CDC: carrier %s\n",
 400                           event->wValue ? "on" : "off");
 401                 if (event->wValue)
 402                         netif_carrier_on(dev->net);
 403                 else
 404                         netif_carrier_off(dev->net);
 405                 break;
 406         case USB_CDC_NOTIFY_SPEED_CHANGE:       /* tx/rx rates */
 407                 netif_dbg(dev, timer, dev->net, "CDC: speed change (len %d)\n",
 408                           urb->actual_length);
 409                 if (urb->actual_length != (sizeof *event + 8))
 410                         set_bit(EVENT_STS_SPLIT, &dev->flags);
 411                 else
 412                         dumpspeed(dev, (__le32 *) &event[1]);
 413                 break;
 414         /* USB_CDC_NOTIFY_RESPONSE_AVAILABLE can happen too (e.g. RNDIS),
 415          * but there are no standard formats for the response data.
 416          */
 417         default:
 418                 netdev_err(dev->net, "CDC: unexpected notification %02x!\n",
 419                            event->bNotificationType);
 420                 break;
 421         }
 422 }
 423
 424 static int cdc_bind(struct usbnet *dev, struct usb_interface *intf)
 425 {
 426         int                             status;
 427         struct cdc_state                *info = (void *) &dev->data;
 428
 429         status = usbnet_generic_cdc_bind(dev, intf);
 430         if (status < 0)
 431                 return status;
 432
 433         status = usbnet_get_ethernet_addr(dev, info->ether->iMACAddress);
 434         if (status < 0) {
 435                 usb_set_intfdata(info->data, NULL);
 436                 usb_driver_release_interface(driver_of(intf), info->data);
 437                 return status;
 438         }
 439
 440         return 0;
 441 }
 442
 443 static int cdc_manage_power(struct usbnet *dev, int on)
 444 {
 445         dev->intf->needs_remote_wakeup = on;
 446         return 0;
 447 }
 448
 449 static const struct driver_info cdc_info = {
 450         .description =  "CDC Ethernet Device",
 451         .flags =        FLAG_ETHER,
 452         // .check_connect = cdc_check_connect,
 453         .bind =         cdc_bind,
 454         .unbind =       usbnet_cdc_unbind,
 455         .status =       cdc_status,
 456         .manage_power = cdc_manage_power,
 457 };
 458
 459 static const struct driver_info mbm_info = {
 460         .description =  "Mobile Broadband Network Device",
 461         .flags =        FLAG_WWAN,
 462         .bind =         cdc_bind,
 463         .unbind =       usbnet_cdc_unbind,
 464         .status =       cdc_status,
 465         .manage_power = cdc_manage_power,
 466 };
 467
 468 /*-------------------------------------------------------------------------*/
 469
 470
 471 static const struct usb_device_id       products [] = {
 472 /*
 473  * BLACKLIST !!
 474  *
 475  * First blacklist any products that are egregiously nonconformant
 476  * with the CDC Ethernet specs.  Minor braindamage we cope with; when
 477  * they're not even trying, needing a separate driver is only the first
 478  * of the differences to show up.
 479  */
 480
 481 #define ZAURUS_MASTER_INTERFACE \
 482         .bInterfaceClass        = USB_CLASS_COMM, \
 483         .bInterfaceSubClass     = USB_CDC_SUBCLASS_ETHERNET, \
 484         .bInterfaceProtocol     = USB_CDC_PROTO_NONE
 485
 486 /* SA-1100 based Sharp Zaurus ("collie"), or compatible;
 487  * wire-incompatible with true CDC Ethernet implementations.
 488  * (And, it seems, needlessly so...)
 489  */
 490 {
 491         .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 492                           | USB_DEVICE_ID_MATCH_DEVICE,
 493         .idVendor               = 0x04DD,
 494         .idProduct              = 0x8004,
 495         ZAURUS_MASTER_INTERFACE,
 496         .driver_info            = 0,
 497 },
 498
 499 /* PXA-25x based Sharp Zaurii.  Note that it seems some of these
 500  * (later models especially) may have shipped only with firmware
 501  * advertising false "CDC MDLM" compatibility ... but we're not
 502  * clear which models did that, so for now let's assume the worst.
 503  */
 504 {
 505         .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 506                           | USB_DEVICE_ID_MATCH_DEVICE,
 507         .idVendor               = 0x04DD,
 508         .idProduct              = 0x8005,       /* A-300 */
 509         ZAURUS_MASTER_INTERFACE,
 510         .driver_info            = 0,
 511 }, {
 512         .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 513                           | USB_DEVICE_ID_MATCH_DEVICE,
 514         .idVendor               = 0x04DD,
 515         .idProduct              = 0x8006,       /* B-500/SL-5600 */
 516         ZAURUS_MASTER_INTERFACE,
 517         .driver_info            = 0,
 518 }, {
 519         .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 520                   | USB_DEVICE_ID_MATCH_DEVICE,
 521         .idVendor               = 0x04DD,
 522         .idProduct              = 0x8007,       /* C-700 */
 523         ZAURUS_MASTER_INTERFACE,
 524         .driver_info            = 0,
 525 }, {
 526         .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 527                  | USB_DEVICE_ID_MATCH_DEVICE,
 528         .idVendor               = 0x04DD,
 529         .idProduct              = 0x9031,       /* C-750 C-760 */
 530         ZAURUS_MASTER_INTERFACE,
 531         .driver_info            = 0,
 532 }, {
 533         .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 534                  | USB_DEVICE_ID_MATCH_DEVICE,
 535         .idVendor               = 0x04DD,
 536         .idProduct              = 0x9032,       /* SL-6000 */
 537         ZAURUS_MASTER_INTERFACE,
 538         .driver_info            = 0,
 539 }, {
 540         .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 541                  | USB_DEVICE_ID_MATCH_DEVICE,
 542         .idVendor               = 0x04DD,
 543         /* reported with some C860 units */
 544         .idProduct              = 0x9050,       /* C-860 */
 545         ZAURUS_MASTER_INTERFACE,
 546         .driver_info            = 0,
 547 },
 548
 549 /* Olympus has some models with a Zaurus-compatible option.
 550  * R-1000 uses a FreeScale i.MXL cpu (ARMv4T)
 551  */
 552 {
 553         .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 554                  | USB_DEVICE_ID_MATCH_DEVICE,
 555         .idVendor               = 0x07B4,
 556         .idProduct              = 0x0F02,       /* R-1000 */
 557         ZAURUS_MASTER_INTERFACE,
 558         .driver_info            = 0,
 559 },
 560
 561 /*
 562  * WHITELIST!!!
 563  *
 564  * CDC Ether uses two interfaces, not necessarily consecutive.
 565  * We match the main interface, ignoring the optional device
 566  * class so we could handle devices that aren't exclusively
 567  * CDC ether.
 568  *
 569  * NOTE:  this match must come AFTER entries blacklisting devices
 570  * because of bugs/quirks in a given product (like Zaurus, above).
 571  */
 572 {
 573         USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ETHERNET,
 574                         USB_CDC_PROTO_NONE),
 575         .driver_info = (unsigned long) &cdc_info,
 576 }, {
 577         USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_MDLM,
 578                         USB_CDC_PROTO_NONE),
 579         .driver_info = (unsigned long)&mbm_info,
 580
 581 },
 582         { },            // END
 583 };
 584 MODULE_DEVICE_TABLE(usb, products);
 585
 586 static struct usb_driver cdc_driver = {
 587         .name =         "cdc_ether",
 588         .id_table =     products,
 589         .probe =        usbnet_probe,
 590         .disconnect =   usbnet_disconnect,
 591         .suspend =      usbnet_suspend,
 592         .resume =       usbnet_resume,
 593         .reset_resume = usbnet_resume,
 594         .supports_autosuspend = 1,
 595 };
 596
 597
 598 static int __init cdc_init(void)
 599 {
 600         BUILD_BUG_ON((sizeof(((struct usbnet *)0)->data)
 601                         < sizeof(struct cdc_state)));
 602
 603         return usb_register(&cdc_driver);
 604 }
 605 module_init(cdc_init);
 606
 607 static void __exit cdc_exit(void)
 608 {
 609         usb_deregister(&cdc_driver);
 610 }
 611 module_exit(cdc_exit);
 612
 613 MODULE_AUTHOR("David Brownell");
 614 MODULE_DESCRIPTION("USB CDC Ethernet devices");
 615 MODULE_LICENSE("GPL");