c924ea2bce07a4c06aa8d6ab5d9c23620b446915
[linux-2.6.git] / 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");