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                 dev_dbg(&intf->dev, "CDC descriptors on config\n");
 103         }
 104
 105         /* Maybe CDC descriptors are after the endpoint?  This bug has
 106          * been seen on some 2Wire Inc RNDIS-ish products.
 107          */
 108         if (len == 0) {
 109                 struct usb_host_endpoint        *hep;
 110
 111                 hep = intf->cur_altsetting->endpoint;
 112                 if (hep) {
 113                         buf = hep->extra;
 114                         len = hep->extralen;
 115                 }
 116                 if (len)
 117                         dev_dbg(&intf->dev,
 118                                 "CDC descriptors on endpoint\n");
 119         }
 120
 121         /* this assumes that if there's a non-RNDIS vendor variant
 122          * of cdc-acm, it'll fail RNDIS requests cleanly.
 123          */
 124         rndis = (is_rndis(&intf->cur_altsetting->desc) ||
 125                  is_activesync(&intf->cur_altsetting->desc) ||
 126                  is_wireless_rndis(&intf->cur_altsetting->desc));
 127
 128         memset(info, 0, sizeof *info);
 129         info->control = intf;
 130         while (len > 3) {
 131                 if (buf [1] != USB_DT_CS_INTERFACE)
 132                         goto next_desc;
 133
 134                 /* use bDescriptorSubType to identify the CDC descriptors.
 135                  * We expect devices with CDC header and union descriptors.
 136                  * For CDC Ethernet we need the ethernet descriptor.
 137                  * For RNDIS, ignore two (pointless) CDC modem descriptors
 138                  * in favor of a complicated OID-based RPC scheme doing what
 139                  * CDC Ethernet achieves with a simple descriptor.
 140                  */
 141                 switch (buf [2]) {
 142                 case USB_CDC_HEADER_TYPE:
 143                         if (info->header) {
 144                                 dev_dbg(&intf->dev, "extra CDC header\n");
 145                                 goto bad_desc;
 146                         }
 147                         info->header = (void *) buf;
 148                         if (info->header->bLength != sizeof *info->header) {
 149                                 dev_dbg(&intf->dev, "CDC header len %u\n",
 150                                         info->header->bLength);
 151                                 goto bad_desc;
 152                         }
 153                         break;
 154                 case USB_CDC_ACM_TYPE:
 155                         /* paranoia:  disambiguate a "real" vendor-specific
 156                          * modem interface from an RNDIS non-modem.
 157                          */
 158                         if (rndis) {
 159                                 struct usb_cdc_acm_descriptor *acm;
 160
 161                                 acm = (void *) buf;
 162                                 if (acm->bmCapabilities) {
 163                                         dev_dbg(&intf->dev,
 164                                                 "ACM capabilities %02x, "
 165                                                 "not really RNDIS?\n",
 166                                                 acm->bmCapabilities);
 167                                         goto bad_desc;
 168                                 }
 169                         }
 170                         break;
 171                 case USB_CDC_UNION_TYPE:
 172                         if (info->u) {
 173                                 dev_dbg(&intf->dev, "extra CDC union\n");
 174                                 goto bad_desc;
 175                         }
 176                         info->u = (void *) buf;
 177                         if (info->u->bLength != sizeof *info->u) {
 178                                 dev_dbg(&intf->dev, "CDC union len %u\n",
 179                                         info->u->bLength);
 180                                 goto bad_desc;
 181                         }
 182
 183                         /* we need a master/control interface (what we're
 184                          * probed with) and a slave/data interface; union
 185                          * descriptors sort this all out.
 186                          */
 187                         info->control = usb_ifnum_to_if(dev->udev,
 188                                                 info->u->bMasterInterface0);
 189                         info->data = usb_ifnum_to_if(dev->udev,
 190                                                 info->u->bSlaveInterface0);
 191                         if (!info->control || !info->data) {
 192                                 dev_dbg(&intf->dev,
 193                                         "master #%u/%p slave #%u/%p\n",
 194                                         info->u->bMasterInterface0,
 195                                         info->control,
 196                                         info->u->bSlaveInterface0,
 197                                         info->data);
 198                                 goto bad_desc;
 199                         }
 200                         if (info->control != intf) {
 201                                 dev_dbg(&intf->dev, "bogus CDC Union\n");
 202                                 /* Ambit USB Cable Modem (and maybe others)
 203                                  * interchanges master and slave interface.
 204                                  */
 205                                 if (info->data == intf) {
 206                                         info->data = info->control;
 207                                         info->control = intf;
 208                                 } else
 209                                         goto bad_desc;
 210                         }
 211
 212                         /* a data interface altsetting does the real i/o */
 213                         d = &info->data->cur_altsetting->desc;
 214                         if (d->bInterfaceClass != USB_CLASS_CDC_DATA) {
 215                                 dev_dbg(&intf->dev, "slave class %u\n",
 216                                         d->bInterfaceClass);
 217                                 goto bad_desc;
 218                         }
 219                         break;
 220                 case USB_CDC_ETHERNET_TYPE:
 221                         if (info->ether) {
 222                                 dev_dbg(&intf->dev, "extra CDC ether\n");
 223                                 goto bad_desc;
 224                         }
 225                         info->ether = (void *) buf;
 226                         if (info->ether->bLength != sizeof *info->ether) {
 227                                 dev_dbg(&intf->dev, "CDC ether len %u\n",
 228                                         info->ether->bLength);
 229                                 goto bad_desc;
 230                         }
 231                         dev->hard_mtu = le16_to_cpu(
 232                                                 info->ether->wMaxSegmentSize);
 233                         /* because of Zaurus, we may be ignoring the host
 234                          * side link address we were given.
 235                          */
 236                         break;
 237                 case USB_CDC_MDLM_TYPE:
 238                         if (desc) {
 239                                 dev_dbg(&intf->dev, "extra MDLM descriptor\n");
 240                                 goto bad_desc;
 241                         }
 242
 243                         desc = (void *)buf;
 244
 245                         if (desc->bLength != sizeof(*desc))
 246                                 goto bad_desc;
 247
 248                         if (memcmp(&desc->bGUID, mbm_guid, 16))
 249                                 goto bad_desc;
 250                         break;
 251                 case USB_CDC_MDLM_DETAIL_TYPE:
 252                         if (detail) {
 253                                 dev_dbg(&intf->dev, "extra MDLM detail descriptor\n");
 254                                 goto bad_desc;
 255                         }
 256
 257                         detail = (void *)buf;
 258
 259                         if (detail->bGuidDescriptorType == 0) {
 260                                 if (detail->bLength < (sizeof(*detail) + 1))
 261                                         goto bad_desc;
 262                         } else
 263                                 goto bad_desc;
 264                         break;
 265                 }
 266 next_desc:
 267                 len -= buf [0]; /* bLength */
 268                 buf += buf [0];
 269         }
 270
 271         /* Microsoft ActiveSync based and some regular RNDIS devices lack the
 272          * CDC descriptors, so we'll hard-wire the interfaces and not check
 273          * for descriptors.
 274          */
 275         if (rndis && !info->u) {
 276                 info->control = usb_ifnum_to_if(dev->udev, 0);
 277                 info->data = usb_ifnum_to_if(dev->udev, 1);
 278                 if (!info->control || !info->data) {
 279                         dev_dbg(&intf->dev,
 280                                 "rndis: master #0/%p slave #1/%p\n",
 281                                 info->control,
 282                                 info->data);
 283                         goto bad_desc;
 284                 }
 285
 286         } else if (!info->header || !info->u || (!rndis && !info->ether)) {
 287                 dev_dbg(&intf->dev, "missing cdc %s%s%sdescriptor\n",
 288                         info->header ? "" : "header ",
 289                         info->u ? "" : "union ",
 290                         info->ether ? "" : "ether ");
 291                 goto bad_desc;
 292         }
 293
 294         /* claim data interface and set it up ... with side effects.
 295          * network traffic can't flow until an altsetting is enabled.
 296          */
 297         status = usb_driver_claim_interface(driver, info->data, dev);
 298         if (status < 0)
 299                 return status;
 300         status = usbnet_get_endpoints(dev, info->data);
 301         if (status < 0) {
 302                 /* ensure immediate exit from usbnet_disconnect */
 303                 usb_set_intfdata(info->data, NULL);
 304                 usb_driver_release_interface(driver, info->data);
 305                 return status;
 306         }
 307
 308         /* status endpoint: optional for CDC Ethernet, not RNDIS (or ACM) */
 309         dev->status = NULL;
 310         if (info->control->cur_altsetting->desc.bNumEndpoints == 1) {
 311                 struct usb_endpoint_descriptor  *desc;
 312
 313                 dev->status = &info->control->cur_altsetting->endpoint [0];
 314                 desc = &dev->status->desc;
 315                 if (!usb_endpoint_is_int_in(desc) ||
 316                     (le16_to_cpu(desc->wMaxPacketSize)
 317                      < sizeof(struct usb_cdc_notification)) ||
 318                     !desc->bInterval) {
 319                         dev_dbg(&intf->dev, "bad notification endpoint\n");
 320                         dev->status = NULL;
 321                 }
 322         }
 323         if (rndis && !dev->status) {
 324                 dev_dbg(&intf->dev, "missing RNDIS status endpoint\n");
 325                 usb_set_intfdata(info->data, NULL);
 326                 usb_driver_release_interface(driver, info->data);
 327                 return -ENODEV;
 328         }
 329         return 0;
 330
 331 bad_desc:
 332         dev_info(&dev->udev->dev, "bad CDC descriptors\n");
 333         return -ENODEV;
 334 }
 335 EXPORT_SYMBOL_GPL(usbnet_generic_cdc_bind);
 336
 337 void usbnet_cdc_unbind(struct usbnet *dev, struct usb_interface *intf)
 338 {
 339         struct cdc_state                *info = (void *) &dev->data;
 340         struct usb_driver               *driver = driver_of(intf);
 341
 342         /* disconnect master --> disconnect slave */
 343         if (intf == info->control && info->data) {
 344                 /* ensure immediate exit from usbnet_disconnect */
 345                 usb_set_intfdata(info->data, NULL);
 346                 usb_driver_release_interface(driver, info->data);
 347                 info->data = NULL;
 348         }
 349
 350         /* and vice versa (just in case) */
 351         else if (intf == info->data && info->control) {
 352                 /* ensure immediate exit from usbnet_disconnect */
 353                 usb_set_intfdata(info->control, NULL);
 354                 usb_driver_release_interface(driver, info->control);
 355                 info->control = NULL;
 356         }
 357 }
 358 EXPORT_SYMBOL_GPL(usbnet_cdc_unbind);
 359
 360 /*-------------------------------------------------------------------------
 361  *
 362  * Communications Device Class, Ethernet Control model
 363  *
 364  * Takes two interfaces.  The DATA interface is inactive till an altsetting
 365  * is selected.  Configuration data includes class descriptors.  There's
 366  * an optional status endpoint on the control interface.
 367  *
 368  * This should interop with whatever the 2.4 "CDCEther.c" driver
 369  * (by Brad Hards) talked with, with more functionality.
 370  *
 371  *-------------------------------------------------------------------------*/
 372
 373 static void dumpspeed(struct usbnet *dev, __le32 *speeds)
 374 {
 375         netif_info(dev, timer, dev->net,
 376                    "link speeds: %u kbps up, %u kbps down\n",
 377                    __le32_to_cpu(speeds[0]) / 1000,
 378                    __le32_to_cpu(speeds[1]) / 1000);
 379 }
 380
 381 void usbnet_cdc_status(struct usbnet *dev, struct urb *urb)
 382 {
 383         struct usb_cdc_notification     *event;
 384
 385         if (urb->actual_length < sizeof *event)
 386                 return;
 387
 388         /* SPEED_CHANGE can get split into two 8-byte packets */
 389         if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
 390                 dumpspeed(dev, (__le32 *) urb->transfer_buffer);
 391                 return;
 392         }
 393
 394         event = urb->transfer_buffer;
 395         switch (event->bNotificationType) {
 396         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 397                 netif_dbg(dev, timer, dev->net, "CDC: carrier %s\n",
 398                           event->wValue ? "on" : "off");
 399                 if (event->wValue)
 400                         netif_carrier_on(dev->net);
 401                 else
 402                         netif_carrier_off(dev->net);
 403                 break;
 404         case USB_CDC_NOTIFY_SPEED_CHANGE:       /* tx/rx rates */
 405                 netif_dbg(dev, timer, dev->net, "CDC: speed change (len %d)\n",
 406                           urb->actual_length);
 407                 if (urb->actual_length != (sizeof *event + 8))
 408                         set_bit(EVENT_STS_SPLIT, &dev->flags);
 409                 else
 410                         dumpspeed(dev, (__le32 *) &event[1]);
 411                 break;
 412         /* USB_CDC_NOTIFY_RESPONSE_AVAILABLE can happen too (e.g. RNDIS),
 413          * but there are no standard formats for the response data.
 414          */
 415         default:
 416                 netdev_err(dev->net, "CDC: unexpected notification %02x!\n",
 417                            event->bNotificationType);
 418                 break;
 419         }
 420 }
 421 EXPORT_SYMBOL_GPL(usbnet_cdc_status);
 422
 423 int usbnet_cdc_bind(struct usbnet *dev, struct usb_interface *intf)
 424 {
 425         int                             status;
 426         struct cdc_state                *info = (void *) &dev->data;
 427
 428         status = usbnet_generic_cdc_bind(dev, intf);
 429         if (status < 0)
 430                 return status;
 431
 432         status = usbnet_get_ethernet_addr(dev, info->ether->iMACAddress);
 433         if (status < 0) {
 434                 usb_set_intfdata(info->data, NULL);
 435                 usb_driver_release_interface(driver_of(intf), info->data);
 436                 return status;
 437         }
 438
 439         /* FIXME cdc-ether has some multicast code too, though it complains
 440          * in routine cases.  info->ether describes the multicast support.
 441          * Implement that here, manipulating the cdc filter as needed.
 442          */
 443         return 0;
 444 }
 445 EXPORT_SYMBOL_GPL(usbnet_cdc_bind);
 446
 447 static int cdc_manage_power(struct usbnet *dev, int on)
 448 {
 449         dev->intf->needs_remote_wakeup = on;
 450         return 0;
 451 }
 452
 453 static const struct driver_info cdc_info = {
 454         .description =  "CDC Ethernet Device",
 455         .flags =        FLAG_ETHER | FLAG_POINTTOPOINT,
 456         // .check_connect = cdc_check_connect,
 457         .bind =         usbnet_cdc_bind,
 458         .unbind =       usbnet_cdc_unbind,
 459         .status =       usbnet_cdc_status,
 460         .manage_power = cdc_manage_power,
 461 };
 462
 463 static const struct driver_info wwan_info = {
 464         .description =  "Mobile Broadband Network Device",
 465         .flags =        FLAG_WWAN,
 466         .bind =         usbnet_cdc_bind,
 467         .unbind =       usbnet_cdc_unbind,
 468         .status =       usbnet_cdc_status,
 469         .manage_power = cdc_manage_power,
 470 };
 471
 472 /*-------------------------------------------------------------------------*/
 473
 474 #define HUAWEI_VENDOR_ID        0x12D1
 475
 476 static const struct usb_device_id       products [] = {
 477 /*
 478  * BLACKLIST !!
 479  *
 480  * First blacklist any products that are egregiously nonconformant
 481  * with the CDC Ethernet specs.  Minor braindamage we cope with; when
 482  * they're not even trying, needing a separate driver is only the first
 483  * of the differences to show up.
 484  */
 485
 486 #define ZAURUS_MASTER_INTERFACE \
 487         .bInterfaceClass        = USB_CLASS_COMM, \
 488         .bInterfaceSubClass     = USB_CDC_SUBCLASS_ETHERNET, \
 489         .bInterfaceProtocol     = USB_CDC_PROTO_NONE
 490
 491 /* SA-1100 based Sharp Zaurus ("collie"), or compatible;
 492  * wire-incompatible with true CDC Ethernet implementations.
 493  * (And, it seems, needlessly so...)
 494  */
 495 {
 496         .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 497                           | USB_DEVICE_ID_MATCH_DEVICE,
 498         .idVendor               = 0x04DD,
 499         .idProduct              = 0x8004,
 500         ZAURUS_MASTER_INTERFACE,
 501         .driver_info            = 0,
 502 },
 503
 504 /* PXA-25x based Sharp Zaurii.  Note that it seems some of these
 505  * (later models especially) may have shipped only with firmware
 506  * advertising false "CDC MDLM" compatibility ... but we're not
 507  * clear which models did that, so for now let's assume the worst.
 508  */
 509 {
 510         .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 511                           | USB_DEVICE_ID_MATCH_DEVICE,
 512         .idVendor               = 0x04DD,
 513         .idProduct              = 0x8005,       /* A-300 */
 514         ZAURUS_MASTER_INTERFACE,
 515         .driver_info            = 0,
 516 }, {
 517         .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 518                           | USB_DEVICE_ID_MATCH_DEVICE,
 519         .idVendor               = 0x04DD,
 520         .idProduct              = 0x8006,       /* B-500/SL-5600 */
 521         ZAURUS_MASTER_INTERFACE,
 522         .driver_info            = 0,
 523 }, {
 524         .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 525                   | USB_DEVICE_ID_MATCH_DEVICE,
 526         .idVendor               = 0x04DD,
 527         .idProduct              = 0x8007,       /* C-700 */
 528         ZAURUS_MASTER_INTERFACE,
 529         .driver_info            = 0,
 530 }, {
 531         .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 532                  | USB_DEVICE_ID_MATCH_DEVICE,
 533         .idVendor               = 0x04DD,
 534         .idProduct              = 0x9031,       /* C-750 C-760 */
 535         ZAURUS_MASTER_INTERFACE,
 536         .driver_info            = 0,
 537 }, {
 538         .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 539                  | USB_DEVICE_ID_MATCH_DEVICE,
 540         .idVendor               = 0x04DD,
 541         .idProduct              = 0x9032,       /* SL-6000 */
 542         ZAURUS_MASTER_INTERFACE,
 543         .driver_info            = 0,
 544 }, {
 545         .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 546                  | USB_DEVICE_ID_MATCH_DEVICE,
 547         .idVendor               = 0x04DD,
 548         /* reported with some C860 units */
 549         .idProduct              = 0x9050,       /* C-860 */
 550         ZAURUS_MASTER_INTERFACE,
 551         .driver_info            = 0,
 552 },
 553
 554 /* Olympus has some models with a Zaurus-compatible option.
 555  * R-1000 uses a FreeScale i.MXL cpu (ARMv4T)
 556  */
 557 {
 558         .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 559                  | USB_DEVICE_ID_MATCH_DEVICE,
 560         .idVendor               = 0x07B4,
 561         .idProduct              = 0x0F02,       /* R-1000 */
 562         ZAURUS_MASTER_INTERFACE,
 563         .driver_info            = 0,
 564 },
 565
 566 /* LG Electronics VL600 wants additional headers on every frame */
 567 {
 568         USB_DEVICE_AND_INTERFACE_INFO(0x1004, 0x61aa, USB_CLASS_COMM,
 569                         USB_CDC_SUBCLASS_ETHERNET, USB_CDC_PROTO_NONE),
 570         .driver_info = (unsigned long)&wwan_info,
 571 },
 572
 573 /*
 574  * WHITELIST!!!
 575  *
 576  * CDC Ether uses two interfaces, not necessarily consecutive.
 577  * We match the main interface, ignoring the optional device
 578  * class so we could handle devices that aren't exclusively
 579  * CDC ether.
 580  *
 581  * NOTE:  this match must come AFTER entries blacklisting devices
 582  * because of bugs/quirks in a given product (like Zaurus, above).
 583  */
 584 {
 585         USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ETHERNET,
 586                         USB_CDC_PROTO_NONE),
 587         .driver_info = (unsigned long) &cdc_info,
 588 }, {
 589         USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_MDLM,
 590                         USB_CDC_PROTO_NONE),
 591         .driver_info = (unsigned long)&wwan_info,
 592
 593 }, {
 594         /* Various Huawei modems with a network port like the UMG1831 */
 595         .match_flags    =   USB_DEVICE_ID_MATCH_VENDOR
 596                  | USB_DEVICE_ID_MATCH_INT_INFO,
 597         .idVendor               = HUAWEI_VENDOR_ID,
 598         .bInterfaceClass        = USB_CLASS_COMM,
 599         .bInterfaceSubClass     = USB_CDC_SUBCLASS_ETHERNET,
 600         .bInterfaceProtocol     = 255,
 601         .driver_info = (unsigned long)&wwan_info,
 602 },
 603         { },            // END
 604 };
 605 MODULE_DEVICE_TABLE(usb, products);
 606
 607 static struct usb_driver cdc_driver = {
 608         .name =         "cdc_ether",
 609         .id_table =     products,
 610         .probe =        usbnet_probe,
 611         .disconnect =   usbnet_disconnect,
 612         .suspend =      usbnet_suspend,
 613         .resume =       usbnet_resume,
 614         .reset_resume = usbnet_resume,
 615         .supports_autosuspend = 1,
 616 };
 617
 618
 619 static int __init cdc_init(void)
 620 {
 621         BUILD_BUG_ON((sizeof(((struct usbnet *)0)->data)
 622                         < sizeof(struct cdc_state)));
 623
 624         return usb_register(&cdc_driver);
 625 }
 626 module_init(cdc_init);
 627
 628 static void __exit cdc_exit(void)
 629 {
 630         usb_deregister(&cdc_driver);
 631 }
 632 module_exit(cdc_exit);
 633
 634 MODULE_AUTHOR("David Brownell");
 635 MODULE_DESCRIPTION("USB CDC Ethernet devices");
 636 MODULE_LICENSE("GPL");