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a03336e086d5ec11423a62b492304c2f00769fc3
[deliverable/linux.git] / drivers / net / usb / cdc_ncm.c
1 /*
2 * cdc_ncm.c
3 *
4 * Copyright (C) ST-Ericsson 2010-2011
5 * Contact: Alexey Orishko <alexey.orishko@stericsson.com>
6 * Original author: Hans Petter Selasky <hans.petter.selasky@stericsson.com>
7 *
8 * USB Host Driver for Network Control Model (NCM)
9 * http://www.usb.org/developers/devclass_docs/NCM10.zip
10 *
11 * The NCM encoding, decoding and initialization logic
12 * derives from FreeBSD 8.x. if_cdce.c and if_cdcereg.h
13 *
14 * This software is available to you under a choice of one of two
15 * licenses. You may choose this file to be licensed under the terms
16 * of the GNU General Public License (GPL) Version 2 or the 2-clause
17 * BSD license listed below:
18 *
19 * Redistribution and use in source and binary forms, with or without
20 * modification, are permitted provided that the following conditions
21 * are met:
22 * 1. Redistributions of source code must retain the above copyright
23 * notice, this list of conditions and the following disclaimer.
24 * 2. Redistributions in binary form must reproduce the above copyright
25 * notice, this list of conditions and the following disclaimer in the
26 * documentation and/or other materials provided with the distribution.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 */
40
41 #include <linux/module.h>
42 #include <linux/init.h>
43 #include <linux/netdevice.h>
44 #include <linux/ctype.h>
45 #include <linux/ethtool.h>
46 #include <linux/workqueue.h>
47 #include <linux/mii.h>
48 #include <linux/crc32.h>
49 #include <linux/usb.h>
50 #include <linux/timer.h>
51 #include <linux/spinlock.h>
52 #include <linux/atomic.h>
53 #include <linux/usb/usbnet.h>
54 #include <linux/usb/cdc.h>
55
56 #define DRIVER_VERSION "04-Aug-2011"
57
58 /* CDC NCM subclass 3.2.1 */
59 #define USB_CDC_NCM_NDP16_LENGTH_MIN 0x10
60
61 /* Maximum NTB length */
62 #define CDC_NCM_NTB_MAX_SIZE_TX 16384 /* bytes */
63 #define CDC_NCM_NTB_MAX_SIZE_RX 16384 /* bytes */
64
65 /* Minimum value for MaxDatagramSize, ch. 6.2.9 */
66 #define CDC_NCM_MIN_DATAGRAM_SIZE 1514 /* bytes */
67
68 #define CDC_NCM_MIN_TX_PKT 512 /* bytes */
69
70 /* Default value for MaxDatagramSize */
71 #define CDC_NCM_MAX_DATAGRAM_SIZE 2048 /* bytes */
72
73 /*
74 * Maximum amount of datagrams in NCM Datagram Pointer Table, not counting
75 * the last NULL entry. Any additional datagrams in NTB would be discarded.
76 */
77 #define CDC_NCM_DPT_DATAGRAMS_MAX 32
78
79 /* Maximum amount of IN datagrams in NTB */
80 #define CDC_NCM_DPT_DATAGRAMS_IN_MAX 0 /* unlimited */
81
82 /* Restart the timer, if amount of datagrams is less than given value */
83 #define CDC_NCM_RESTART_TIMER_DATAGRAM_CNT 3
84
85 /* The following macro defines the minimum header space */
86 #define CDC_NCM_MIN_HDR_SIZE \
87 (sizeof(struct usb_cdc_ncm_nth16) + sizeof(struct usb_cdc_ncm_ndp16) + \
88 (CDC_NCM_DPT_DATAGRAMS_MAX + 1) * sizeof(struct usb_cdc_ncm_dpe16))
89
90 struct cdc_ncm_data {
91 struct usb_cdc_ncm_nth16 nth16;
92 struct usb_cdc_ncm_ndp16 ndp16;
93 struct usb_cdc_ncm_dpe16 dpe16[CDC_NCM_DPT_DATAGRAMS_MAX + 1];
94 };
95
96 struct cdc_ncm_ctx {
97 struct cdc_ncm_data rx_ncm;
98 struct cdc_ncm_data tx_ncm;
99 struct usb_cdc_ncm_ntb_parameters ncm_parm;
100 struct timer_list tx_timer;
101
102 const struct usb_cdc_ncm_desc *func_desc;
103 const struct usb_cdc_header_desc *header_desc;
104 const struct usb_cdc_union_desc *union_desc;
105 const struct usb_cdc_ether_desc *ether_desc;
106
107 struct net_device *netdev;
108 struct usb_device *udev;
109 struct usb_host_endpoint *in_ep;
110 struct usb_host_endpoint *out_ep;
111 struct usb_host_endpoint *status_ep;
112 struct usb_interface *intf;
113 struct usb_interface *control;
114 struct usb_interface *data;
115
116 struct sk_buff *tx_curr_skb;
117 struct sk_buff *tx_rem_skb;
118
119 spinlock_t mtx;
120
121 u32 tx_timer_pending;
122 u32 tx_curr_offset;
123 u32 tx_curr_last_offset;
124 u32 tx_curr_frame_num;
125 u32 rx_speed;
126 u32 tx_speed;
127 u32 rx_max;
128 u32 tx_max;
129 u32 max_datagram_size;
130 u16 tx_max_datagrams;
131 u16 tx_remainder;
132 u16 tx_modulus;
133 u16 tx_ndp_modulus;
134 u16 tx_seq;
135 u16 connected;
136 };
137
138 static void cdc_ncm_tx_timeout(unsigned long arg);
139 static const struct driver_info cdc_ncm_info;
140 static struct usb_driver cdc_ncm_driver;
141 static struct ethtool_ops cdc_ncm_ethtool_ops;
142
143 static const struct usb_device_id cdc_devs[] = {
144 { USB_INTERFACE_INFO(USB_CLASS_COMM,
145 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
146 .driver_info = (unsigned long)&cdc_ncm_info,
147 },
148 {
149 },
150 };
151
152 MODULE_DEVICE_TABLE(usb, cdc_devs);
153
154 static void
155 cdc_ncm_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info)
156 {
157 struct usbnet *dev = netdev_priv(net);
158
159 strncpy(info->driver, dev->driver_name, sizeof(info->driver));
160 strncpy(info->version, DRIVER_VERSION, sizeof(info->version));
161 strncpy(info->fw_version, dev->driver_info->description,
162 sizeof(info->fw_version));
163 usb_make_path(dev->udev, info->bus_info, sizeof(info->bus_info));
164 }
165
166 static u8 cdc_ncm_setup(struct cdc_ncm_ctx *ctx)
167 {
168 u32 val;
169 u8 flags;
170 u8 iface_no;
171 int err;
172 u16 ntb_fmt_supported;
173
174 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
175
176 err = usb_control_msg(ctx->udev,
177 usb_rcvctrlpipe(ctx->udev, 0),
178 USB_CDC_GET_NTB_PARAMETERS,
179 USB_TYPE_CLASS | USB_DIR_IN
180 | USB_RECIP_INTERFACE,
181 0, iface_no, &ctx->ncm_parm,
182 sizeof(ctx->ncm_parm), 10000);
183 if (err < 0) {
184 pr_debug("failed GET_NTB_PARAMETERS\n");
185 return 1;
186 }
187
188 /* read correct set of parameters according to device mode */
189 ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize);
190 ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize);
191 ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder);
192 ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor);
193 ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment);
194 /* devices prior to NCM Errata shall set this field to zero */
195 ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams);
196 ntb_fmt_supported = le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported);
197
198 if (ctx->func_desc != NULL)
199 flags = ctx->func_desc->bmNetworkCapabilities;
200 else
201 flags = 0;
202
203 pr_debug("dwNtbInMaxSize=%u dwNtbOutMaxSize=%u "
204 "wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u "
205 "wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n",
206 ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus,
207 ctx->tx_ndp_modulus, ctx->tx_max_datagrams, flags);
208
209 /* max count of tx datagrams */
210 if ((ctx->tx_max_datagrams == 0) ||
211 (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX))
212 ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX;
213
214 /* verify maximum size of received NTB in bytes */
215 if (ctx->rx_max < USB_CDC_NCM_NTB_MIN_IN_SIZE) {
216 pr_debug("Using min receive length=%d\n",
217 USB_CDC_NCM_NTB_MIN_IN_SIZE);
218 ctx->rx_max = USB_CDC_NCM_NTB_MIN_IN_SIZE;
219 }
220
221 if (ctx->rx_max > CDC_NCM_NTB_MAX_SIZE_RX) {
222 pr_debug("Using default maximum receive length=%d\n",
223 CDC_NCM_NTB_MAX_SIZE_RX);
224 ctx->rx_max = CDC_NCM_NTB_MAX_SIZE_RX;
225 }
226
227 /* inform device about NTB input size changes */
228 if (ctx->rx_max != le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize)) {
229
230 if (flags & USB_CDC_NCM_NCAP_NTB_INPUT_SIZE) {
231 struct usb_cdc_ncm_ndp_input_size ndp_in_sz;
232 err = usb_control_msg(ctx->udev,
233 usb_sndctrlpipe(ctx->udev, 0),
234 USB_CDC_SET_NTB_INPUT_SIZE,
235 USB_TYPE_CLASS | USB_DIR_OUT
236 | USB_RECIP_INTERFACE,
237 0, iface_no, &ndp_in_sz, 8, 1000);
238 } else {
239 __le32 dwNtbInMaxSize = cpu_to_le32(ctx->rx_max);
240 err = usb_control_msg(ctx->udev,
241 usb_sndctrlpipe(ctx->udev, 0),
242 USB_CDC_SET_NTB_INPUT_SIZE,
243 USB_TYPE_CLASS | USB_DIR_OUT
244 | USB_RECIP_INTERFACE,
245 0, iface_no, &dwNtbInMaxSize, 4, 1000);
246 }
247
248 if (err < 0)
249 pr_debug("Setting NTB Input Size failed\n");
250 }
251
252 /* verify maximum size of transmitted NTB in bytes */
253 if ((ctx->tx_max <
254 (CDC_NCM_MIN_HDR_SIZE + CDC_NCM_MIN_DATAGRAM_SIZE)) ||
255 (ctx->tx_max > CDC_NCM_NTB_MAX_SIZE_TX)) {
256 pr_debug("Using default maximum transmit length=%d\n",
257 CDC_NCM_NTB_MAX_SIZE_TX);
258 ctx->tx_max = CDC_NCM_NTB_MAX_SIZE_TX;
259 }
260
261 /*
262 * verify that the structure alignment is:
263 * - power of two
264 * - not greater than the maximum transmit length
265 * - not less than four bytes
266 */
267 val = ctx->tx_ndp_modulus;
268
269 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
270 (val != ((-val) & val)) || (val >= ctx->tx_max)) {
271 pr_debug("Using default alignment: 4 bytes\n");
272 ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
273 }
274
275 /*
276 * verify that the payload alignment is:
277 * - power of two
278 * - not greater than the maximum transmit length
279 * - not less than four bytes
280 */
281 val = ctx->tx_modulus;
282
283 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
284 (val != ((-val) & val)) || (val >= ctx->tx_max)) {
285 pr_debug("Using default transmit modulus: 4 bytes\n");
286 ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
287 }
288
289 /* verify the payload remainder */
290 if (ctx->tx_remainder >= ctx->tx_modulus) {
291 pr_debug("Using default transmit remainder: 0 bytes\n");
292 ctx->tx_remainder = 0;
293 }
294
295 /* adjust TX-remainder according to NCM specification. */
296 ctx->tx_remainder = ((ctx->tx_remainder - ETH_HLEN) &
297 (ctx->tx_modulus - 1));
298
299 /* additional configuration */
300
301 /* set CRC Mode */
302 if (flags & USB_CDC_NCM_NCAP_CRC_MODE) {
303 err = usb_control_msg(ctx->udev, usb_sndctrlpipe(ctx->udev, 0),
304 USB_CDC_SET_CRC_MODE,
305 USB_TYPE_CLASS | USB_DIR_OUT
306 | USB_RECIP_INTERFACE,
307 USB_CDC_NCM_CRC_NOT_APPENDED,
308 iface_no, NULL, 0, 1000);
309 if (err < 0)
310 pr_debug("Setting CRC mode off failed\n");
311 }
312
313 /* set NTB format, if both formats are supported */
314 if (ntb_fmt_supported & USB_CDC_NCM_NTH32_SIGN) {
315 err = usb_control_msg(ctx->udev, usb_sndctrlpipe(ctx->udev, 0),
316 USB_CDC_SET_NTB_FORMAT, USB_TYPE_CLASS
317 | USB_DIR_OUT | USB_RECIP_INTERFACE,
318 USB_CDC_NCM_NTB16_FORMAT,
319 iface_no, NULL, 0, 1000);
320 if (err < 0)
321 pr_debug("Setting NTB format to 16-bit failed\n");
322 }
323
324 ctx->max_datagram_size = CDC_NCM_MIN_DATAGRAM_SIZE;
325
326 /* set Max Datagram Size (MTU) */
327 if (flags & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE) {
328 __le16 max_datagram_size;
329 u16 eth_max_sz = le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
330 err = usb_control_msg(ctx->udev, usb_rcvctrlpipe(ctx->udev, 0),
331 USB_CDC_GET_MAX_DATAGRAM_SIZE,
332 USB_TYPE_CLASS | USB_DIR_IN
333 | USB_RECIP_INTERFACE,
334 0, iface_no, &max_datagram_size,
335 2, 1000);
336 if (err < 0) {
337 pr_debug("GET_MAX_DATAGRAM_SIZE failed, use size=%u\n",
338 CDC_NCM_MIN_DATAGRAM_SIZE);
339 } else {
340 ctx->max_datagram_size = le16_to_cpu(max_datagram_size);
341 /* Check Eth descriptor value */
342 if (eth_max_sz < CDC_NCM_MAX_DATAGRAM_SIZE) {
343 if (ctx->max_datagram_size > eth_max_sz)
344 ctx->max_datagram_size = eth_max_sz;
345 } else {
346 if (ctx->max_datagram_size >
347 CDC_NCM_MAX_DATAGRAM_SIZE)
348 ctx->max_datagram_size =
349 CDC_NCM_MAX_DATAGRAM_SIZE;
350 }
351
352 if (ctx->max_datagram_size < CDC_NCM_MIN_DATAGRAM_SIZE)
353 ctx->max_datagram_size =
354 CDC_NCM_MIN_DATAGRAM_SIZE;
355
356 /* if value changed, update device */
357 err = usb_control_msg(ctx->udev,
358 usb_sndctrlpipe(ctx->udev, 0),
359 USB_CDC_SET_MAX_DATAGRAM_SIZE,
360 USB_TYPE_CLASS | USB_DIR_OUT
361 | USB_RECIP_INTERFACE,
362 0,
363 iface_no, &max_datagram_size,
364 2, 1000);
365 if (err < 0)
366 pr_debug("SET_MAX_DATAGRAM_SIZE failed\n");
367 }
368
369 }
370
371 if (ctx->netdev->mtu != (ctx->max_datagram_size - ETH_HLEN))
372 ctx->netdev->mtu = ctx->max_datagram_size - ETH_HLEN;
373
374 return 0;
375 }
376
377 static void
378 cdc_ncm_find_endpoints(struct cdc_ncm_ctx *ctx, struct usb_interface *intf)
379 {
380 struct usb_host_endpoint *e;
381 u8 ep;
382
383 for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) {
384
385 e = intf->cur_altsetting->endpoint + ep;
386 switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
387 case USB_ENDPOINT_XFER_INT:
388 if (usb_endpoint_dir_in(&e->desc)) {
389 if (ctx->status_ep == NULL)
390 ctx->status_ep = e;
391 }
392 break;
393
394 case USB_ENDPOINT_XFER_BULK:
395 if (usb_endpoint_dir_in(&e->desc)) {
396 if (ctx->in_ep == NULL)
397 ctx->in_ep = e;
398 } else {
399 if (ctx->out_ep == NULL)
400 ctx->out_ep = e;
401 }
402 break;
403
404 default:
405 break;
406 }
407 }
408 }
409
410 static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
411 {
412 if (ctx == NULL)
413 return;
414
415 del_timer_sync(&ctx->tx_timer);
416
417 if (ctx->tx_rem_skb != NULL) {
418 dev_kfree_skb_any(ctx->tx_rem_skb);
419 ctx->tx_rem_skb = NULL;
420 }
421
422 if (ctx->tx_curr_skb != NULL) {
423 dev_kfree_skb_any(ctx->tx_curr_skb);
424 ctx->tx_curr_skb = NULL;
425 }
426
427 kfree(ctx);
428 }
429
430 static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
431 {
432 struct cdc_ncm_ctx *ctx;
433 struct usb_driver *driver;
434 u8 *buf;
435 int len;
436 int temp;
437 u8 iface_no;
438
439 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
440 if (ctx == NULL)
441 return -ENODEV;
442
443 memset(ctx, 0, sizeof(*ctx));
444
445 init_timer(&ctx->tx_timer);
446 spin_lock_init(&ctx->mtx);
447 ctx->netdev = dev->net;
448
449 /* store ctx pointer in device data field */
450 dev->data[0] = (unsigned long)ctx;
451
452 /* get some pointers */
453 driver = driver_of(intf);
454 buf = intf->cur_altsetting->extra;
455 len = intf->cur_altsetting->extralen;
456
457 ctx->udev = dev->udev;
458 ctx->intf = intf;
459
460 /* parse through descriptors associated with control interface */
461 while ((len > 0) && (buf[0] > 2) && (buf[0] <= len)) {
462
463 if (buf[1] != USB_DT_CS_INTERFACE)
464 goto advance;
465
466 switch (buf[2]) {
467 case USB_CDC_UNION_TYPE:
468 if (buf[0] < sizeof(*(ctx->union_desc)))
469 break;
470
471 ctx->union_desc =
472 (const struct usb_cdc_union_desc *)buf;
473
474 ctx->control = usb_ifnum_to_if(dev->udev,
475 ctx->union_desc->bMasterInterface0);
476 ctx->data = usb_ifnum_to_if(dev->udev,
477 ctx->union_desc->bSlaveInterface0);
478 break;
479
480 case USB_CDC_ETHERNET_TYPE:
481 if (buf[0] < sizeof(*(ctx->ether_desc)))
482 break;
483
484 ctx->ether_desc =
485 (const struct usb_cdc_ether_desc *)buf;
486 dev->hard_mtu =
487 le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
488
489 if (dev->hard_mtu < CDC_NCM_MIN_DATAGRAM_SIZE)
490 dev->hard_mtu = CDC_NCM_MIN_DATAGRAM_SIZE;
491 else if (dev->hard_mtu > CDC_NCM_MAX_DATAGRAM_SIZE)
492 dev->hard_mtu = CDC_NCM_MAX_DATAGRAM_SIZE;
493 break;
494
495 case USB_CDC_NCM_TYPE:
496 if (buf[0] < sizeof(*(ctx->func_desc)))
497 break;
498
499 ctx->func_desc = (const struct usb_cdc_ncm_desc *)buf;
500 break;
501
502 default:
503 break;
504 }
505 advance:
506 /* advance to next descriptor */
507 temp = buf[0];
508 buf += temp;
509 len -= temp;
510 }
511
512 /* check if we got everything */
513 if ((ctx->control == NULL) || (ctx->data == NULL) ||
514 (ctx->ether_desc == NULL) || (ctx->control != intf))
515 goto error;
516
517 /* claim interfaces, if any */
518 temp = usb_driver_claim_interface(driver, ctx->data, dev);
519 if (temp)
520 goto error;
521
522 iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
523
524 /* reset data interface */
525 temp = usb_set_interface(dev->udev, iface_no, 0);
526 if (temp)
527 goto error2;
528
529 /* initialize data interface */
530 if (cdc_ncm_setup(ctx))
531 goto error2;
532
533 /* configure data interface */
534 temp = usb_set_interface(dev->udev, iface_no, 1);
535 if (temp)
536 goto error2;
537
538 cdc_ncm_find_endpoints(ctx, ctx->data);
539 cdc_ncm_find_endpoints(ctx, ctx->control);
540
541 if ((ctx->in_ep == NULL) || (ctx->out_ep == NULL) ||
542 (ctx->status_ep == NULL))
543 goto error2;
544
545 dev->net->ethtool_ops = &cdc_ncm_ethtool_ops;
546
547 usb_set_intfdata(ctx->data, dev);
548 usb_set_intfdata(ctx->control, dev);
549 usb_set_intfdata(ctx->intf, dev);
550
551 temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress);
552 if (temp)
553 goto error2;
554
555 dev_info(&dev->udev->dev, "MAC-Address: "
556 "0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x\n",
557 dev->net->dev_addr[0], dev->net->dev_addr[1],
558 dev->net->dev_addr[2], dev->net->dev_addr[3],
559 dev->net->dev_addr[4], dev->net->dev_addr[5]);
560
561 dev->in = usb_rcvbulkpipe(dev->udev,
562 ctx->in_ep->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
563 dev->out = usb_sndbulkpipe(dev->udev,
564 ctx->out_ep->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
565 dev->status = ctx->status_ep;
566 dev->rx_urb_size = ctx->rx_max;
567
568 /*
569 * We should get an event when network connection is "connected" or
570 * "disconnected". Set network connection in "disconnected" state
571 * (carrier is OFF) during attach, so the IP network stack does not
572 * start IPv6 negotiation and more.
573 */
574 netif_carrier_off(dev->net);
575 ctx->tx_speed = ctx->rx_speed = 0;
576 return 0;
577
578 error2:
579 usb_set_intfdata(ctx->control, NULL);
580 usb_set_intfdata(ctx->data, NULL);
581 usb_driver_release_interface(driver, ctx->data);
582 error:
583 cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
584 dev->data[0] = 0;
585 dev_info(&dev->udev->dev, "bind() failure\n");
586 return -ENODEV;
587 }
588
589 static void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)
590 {
591 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
592 struct usb_driver *driver = driver_of(intf);
593
594 if (ctx == NULL)
595 return; /* no setup */
596
597 /* disconnect master --> disconnect slave */
598 if (intf == ctx->control && ctx->data) {
599 usb_set_intfdata(ctx->data, NULL);
600 usb_driver_release_interface(driver, ctx->data);
601 ctx->data = NULL;
602
603 } else if (intf == ctx->data && ctx->control) {
604 usb_set_intfdata(ctx->control, NULL);
605 usb_driver_release_interface(driver, ctx->control);
606 ctx->control = NULL;
607 }
608
609 usb_set_intfdata(ctx->intf, NULL);
610 cdc_ncm_free(ctx);
611 }
612
613 static void cdc_ncm_zero_fill(u8 *ptr, u32 first, u32 end, u32 max)
614 {
615 if (first >= max)
616 return;
617 if (first >= end)
618 return;
619 if (end > max)
620 end = max;
621 memset(ptr + first, 0, end - first);
622 }
623
624 static struct sk_buff *
625 cdc_ncm_fill_tx_frame(struct cdc_ncm_ctx *ctx, struct sk_buff *skb)
626 {
627 struct sk_buff *skb_out;
628 u32 rem;
629 u32 offset;
630 u32 last_offset;
631 u16 n = 0, index;
632 u8 ready2send = 0;
633
634 /* if there is a remaining skb, it gets priority */
635 if (skb != NULL)
636 swap(skb, ctx->tx_rem_skb);
637 else
638 ready2send = 1;
639
640 /*
641 * +----------------+
642 * | skb_out |
643 * +----------------+
644 * ^ offset
645 * ^ last_offset
646 */
647
648 /* check if we are resuming an OUT skb */
649 if (ctx->tx_curr_skb != NULL) {
650 /* pop variables */
651 skb_out = ctx->tx_curr_skb;
652 offset = ctx->tx_curr_offset;
653 last_offset = ctx->tx_curr_last_offset;
654 n = ctx->tx_curr_frame_num;
655
656 } else {
657 /* reset variables */
658 skb_out = alloc_skb((ctx->tx_max + 1), GFP_ATOMIC);
659 if (skb_out == NULL) {
660 if (skb != NULL) {
661 dev_kfree_skb_any(skb);
662 ctx->netdev->stats.tx_dropped++;
663 }
664 goto exit_no_skb;
665 }
666
667 /* make room for NTH and NDP */
668 offset = ALIGN(sizeof(struct usb_cdc_ncm_nth16),
669 ctx->tx_ndp_modulus) +
670 sizeof(struct usb_cdc_ncm_ndp16) +
671 (ctx->tx_max_datagrams + 1) *
672 sizeof(struct usb_cdc_ncm_dpe16);
673
674 /* store last valid offset before alignment */
675 last_offset = offset;
676 /* align first Datagram offset correctly */
677 offset = ALIGN(offset, ctx->tx_modulus) + ctx->tx_remainder;
678 /* zero buffer till the first IP datagram */
679 cdc_ncm_zero_fill(skb_out->data, 0, offset, offset);
680 n = 0;
681 ctx->tx_curr_frame_num = 0;
682 }
683
684 for (; n < ctx->tx_max_datagrams; n++) {
685 /* check if end of transmit buffer is reached */
686 if (offset >= ctx->tx_max) {
687 ready2send = 1;
688 break;
689 }
690 /* compute maximum buffer size */
691 rem = ctx->tx_max - offset;
692
693 if (skb == NULL) {
694 skb = ctx->tx_rem_skb;
695 ctx->tx_rem_skb = NULL;
696
697 /* check for end of skb */
698 if (skb == NULL)
699 break;
700 }
701
702 if (skb->len > rem) {
703 if (n == 0) {
704 /* won't fit, MTU problem? */
705 dev_kfree_skb_any(skb);
706 skb = NULL;
707 ctx->netdev->stats.tx_dropped++;
708 } else {
709 /* no room for skb - store for later */
710 if (ctx->tx_rem_skb != NULL) {
711 dev_kfree_skb_any(ctx->tx_rem_skb);
712 ctx->netdev->stats.tx_dropped++;
713 }
714 ctx->tx_rem_skb = skb;
715 skb = NULL;
716 ready2send = 1;
717 }
718 break;
719 }
720
721 memcpy(((u8 *)skb_out->data) + offset, skb->data, skb->len);
722
723 ctx->tx_ncm.dpe16[n].wDatagramLength = cpu_to_le16(skb->len);
724 ctx->tx_ncm.dpe16[n].wDatagramIndex = cpu_to_le16(offset);
725
726 /* update offset */
727 offset += skb->len;
728
729 /* store last valid offset before alignment */
730 last_offset = offset;
731
732 /* align offset correctly */
733 offset = ALIGN(offset, ctx->tx_modulus) + ctx->tx_remainder;
734
735 /* zero padding */
736 cdc_ncm_zero_fill(skb_out->data, last_offset, offset,
737 ctx->tx_max);
738 dev_kfree_skb_any(skb);
739 skb = NULL;
740 }
741
742 /* free up any dangling skb */
743 if (skb != NULL) {
744 dev_kfree_skb_any(skb);
745 skb = NULL;
746 ctx->netdev->stats.tx_dropped++;
747 }
748
749 ctx->tx_curr_frame_num = n;
750
751 if (n == 0) {
752 /* wait for more frames */
753 /* push variables */
754 ctx->tx_curr_skb = skb_out;
755 ctx->tx_curr_offset = offset;
756 ctx->tx_curr_last_offset = last_offset;
757 goto exit_no_skb;
758
759 } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0)) {
760 /* wait for more frames */
761 /* push variables */
762 ctx->tx_curr_skb = skb_out;
763 ctx->tx_curr_offset = offset;
764 ctx->tx_curr_last_offset = last_offset;
765 /* set the pending count */
766 if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT)
767 ctx->tx_timer_pending = 2;
768 goto exit_no_skb;
769
770 } else {
771 /* frame goes out */
772 /* variables will be reset at next call */
773 }
774
775 /* check for overflow */
776 if (last_offset > ctx->tx_max)
777 last_offset = ctx->tx_max;
778
779 /* revert offset */
780 offset = last_offset;
781
782 /*
783 * If collected data size is less or equal CDC_NCM_MIN_TX_PKT bytes,
784 * we send buffers as it is. If we get more data, it would be more
785 * efficient for USB HS mobile device with DMA engine to receive a full
786 * size NTB, than canceling DMA transfer and receiving a short packet.
787 */
788 if (offset > CDC_NCM_MIN_TX_PKT)
789 offset = ctx->tx_max;
790
791 /* final zero padding */
792 cdc_ncm_zero_fill(skb_out->data, last_offset, offset, ctx->tx_max);
793
794 /* store last offset */
795 last_offset = offset;
796
797 if (((last_offset < ctx->tx_max) && ((last_offset %
798 le16_to_cpu(ctx->out_ep->desc.wMaxPacketSize)) == 0)) ||
799 (((last_offset == ctx->tx_max) && ((ctx->tx_max %
800 le16_to_cpu(ctx->out_ep->desc.wMaxPacketSize)) == 0)) &&
801 (ctx->tx_max < le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize)))) {
802 /* force short packet */
803 *(((u8 *)skb_out->data) + last_offset) = 0;
804 last_offset++;
805 }
806
807 /* zero the rest of the DPEs plus the last NULL entry */
808 for (; n <= CDC_NCM_DPT_DATAGRAMS_MAX; n++) {
809 ctx->tx_ncm.dpe16[n].wDatagramLength = 0;
810 ctx->tx_ncm.dpe16[n].wDatagramIndex = 0;
811 }
812
813 /* fill out 16-bit NTB header */
814 ctx->tx_ncm.nth16.dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
815 ctx->tx_ncm.nth16.wHeaderLength =
816 cpu_to_le16(sizeof(ctx->tx_ncm.nth16));
817 ctx->tx_ncm.nth16.wSequence = cpu_to_le16(ctx->tx_seq);
818 ctx->tx_ncm.nth16.wBlockLength = cpu_to_le16(last_offset);
819 index = ALIGN(sizeof(struct usb_cdc_ncm_nth16), ctx->tx_ndp_modulus);
820 ctx->tx_ncm.nth16.wNdpIndex = cpu_to_le16(index);
821
822 memcpy(skb_out->data, &(ctx->tx_ncm.nth16), sizeof(ctx->tx_ncm.nth16));
823 ctx->tx_seq++;
824
825 /* fill out 16-bit NDP table */
826 ctx->tx_ncm.ndp16.dwSignature =
827 cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN);
828 rem = sizeof(ctx->tx_ncm.ndp16) + ((ctx->tx_curr_frame_num + 1) *
829 sizeof(struct usb_cdc_ncm_dpe16));
830 ctx->tx_ncm.ndp16.wLength = cpu_to_le16(rem);
831 ctx->tx_ncm.ndp16.wNextNdpIndex = 0; /* reserved */
832
833 memcpy(((u8 *)skb_out->data) + index,
834 &(ctx->tx_ncm.ndp16),
835 sizeof(ctx->tx_ncm.ndp16));
836
837 memcpy(((u8 *)skb_out->data) + index + sizeof(ctx->tx_ncm.ndp16),
838 &(ctx->tx_ncm.dpe16),
839 (ctx->tx_curr_frame_num + 1) *
840 sizeof(struct usb_cdc_ncm_dpe16));
841
842 /* set frame length */
843 skb_put(skb_out, last_offset);
844
845 /* return skb */
846 ctx->tx_curr_skb = NULL;
847 return skb_out;
848
849 exit_no_skb:
850 return NULL;
851 }
852
853 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx)
854 {
855 /* start timer, if not already started */
856 if (timer_pending(&ctx->tx_timer) == 0) {
857 ctx->tx_timer.function = &cdc_ncm_tx_timeout;
858 ctx->tx_timer.data = (unsigned long)ctx;
859 ctx->tx_timer.expires = jiffies + ((HZ + 999) / 1000);
860 add_timer(&ctx->tx_timer);
861 }
862 }
863
864 static void cdc_ncm_tx_timeout(unsigned long arg)
865 {
866 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)arg;
867 u8 restart;
868
869 spin_lock(&ctx->mtx);
870 if (ctx->tx_timer_pending != 0) {
871 ctx->tx_timer_pending--;
872 restart = 1;
873 } else {
874 restart = 0;
875 }
876
877 spin_unlock(&ctx->mtx);
878
879 if (restart) {
880 spin_lock(&ctx->mtx);
881 cdc_ncm_tx_timeout_start(ctx);
882 spin_unlock(&ctx->mtx);
883 } else if (ctx->netdev != NULL) {
884 usbnet_start_xmit(NULL, ctx->netdev);
885 }
886 }
887
888 static struct sk_buff *
889 cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
890 {
891 struct sk_buff *skb_out;
892 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
893 u8 need_timer = 0;
894
895 /*
896 * The Ethernet API we are using does not support transmitting
897 * multiple Ethernet frames in a single call. This driver will
898 * accumulate multiple Ethernet frames and send out a larger
899 * USB frame when the USB buffer is full or when a single jiffies
900 * timeout happens.
901 */
902 if (ctx == NULL)
903 goto error;
904
905 spin_lock(&ctx->mtx);
906 skb_out = cdc_ncm_fill_tx_frame(ctx, skb);
907 if (ctx->tx_curr_skb != NULL)
908 need_timer = 1;
909
910 /* Start timer, if there is a remaining skb */
911 if (need_timer)
912 cdc_ncm_tx_timeout_start(ctx);
913
914 if (skb_out)
915 dev->net->stats.tx_packets += ctx->tx_curr_frame_num;
916
917 spin_unlock(&ctx->mtx);
918 return skb_out;
919
920 error:
921 if (skb != NULL)
922 dev_kfree_skb_any(skb);
923
924 return NULL;
925 }
926
927 static int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
928 {
929 struct sk_buff *skb;
930 struct cdc_ncm_ctx *ctx;
931 int sumlen;
932 int actlen;
933 int temp;
934 int nframes;
935 int x;
936 int offset;
937
938 ctx = (struct cdc_ncm_ctx *)dev->data[0];
939 if (ctx == NULL)
940 goto error;
941
942 actlen = skb_in->len;
943 sumlen = CDC_NCM_NTB_MAX_SIZE_RX;
944
945 if (actlen < (sizeof(ctx->rx_ncm.nth16) + sizeof(ctx->rx_ncm.ndp16))) {
946 pr_debug("frame too short\n");
947 goto error;
948 }
949
950 memcpy(&(ctx->rx_ncm.nth16), ((u8 *)skb_in->data),
951 sizeof(ctx->rx_ncm.nth16));
952
953 if (le32_to_cpu(ctx->rx_ncm.nth16.dwSignature) !=
954 USB_CDC_NCM_NTH16_SIGN) {
955 pr_debug("invalid NTH16 signature <%u>\n",
956 le32_to_cpu(ctx->rx_ncm.nth16.dwSignature));
957 goto error;
958 }
959
960 temp = le16_to_cpu(ctx->rx_ncm.nth16.wBlockLength);
961 if (temp > sumlen) {
962 pr_debug("unsupported NTB block length %u/%u\n", temp, sumlen);
963 goto error;
964 }
965
966 temp = le16_to_cpu(ctx->rx_ncm.nth16.wNdpIndex);
967 if ((temp + sizeof(ctx->rx_ncm.ndp16)) > actlen) {
968 pr_debug("invalid DPT16 index\n");
969 goto error;
970 }
971
972 memcpy(&(ctx->rx_ncm.ndp16), ((u8 *)skb_in->data) + temp,
973 sizeof(ctx->rx_ncm.ndp16));
974
975 if (le32_to_cpu(ctx->rx_ncm.ndp16.dwSignature) !=
976 USB_CDC_NCM_NDP16_NOCRC_SIGN) {
977 pr_debug("invalid DPT16 signature <%u>\n",
978 le32_to_cpu(ctx->rx_ncm.ndp16.dwSignature));
979 goto error;
980 }
981
982 if (le16_to_cpu(ctx->rx_ncm.ndp16.wLength) <
983 USB_CDC_NCM_NDP16_LENGTH_MIN) {
984 pr_debug("invalid DPT16 length <%u>\n",
985 le32_to_cpu(ctx->rx_ncm.ndp16.dwSignature));
986 goto error;
987 }
988
989 nframes = ((le16_to_cpu(ctx->rx_ncm.ndp16.wLength) -
990 sizeof(struct usb_cdc_ncm_ndp16)) /
991 sizeof(struct usb_cdc_ncm_dpe16));
992 nframes--; /* we process NDP entries except for the last one */
993
994 pr_debug("nframes = %u\n", nframes);
995
996 temp += sizeof(ctx->rx_ncm.ndp16);
997
998 if ((temp + nframes * (sizeof(struct usb_cdc_ncm_dpe16))) > actlen) {
999 pr_debug("Invalid nframes = %d\n", nframes);
1000 goto error;
1001 }
1002
1003 if (nframes > CDC_NCM_DPT_DATAGRAMS_MAX) {
1004 pr_debug("Truncating number of frames from %u to %u\n",
1005 nframes, CDC_NCM_DPT_DATAGRAMS_MAX);
1006 nframes = CDC_NCM_DPT_DATAGRAMS_MAX;
1007 }
1008
1009 memcpy(&(ctx->rx_ncm.dpe16), ((u8 *)skb_in->data) + temp,
1010 nframes * (sizeof(struct usb_cdc_ncm_dpe16)));
1011
1012 for (x = 0; x < nframes; x++) {
1013 offset = le16_to_cpu(ctx->rx_ncm.dpe16[x].wDatagramIndex);
1014 temp = le16_to_cpu(ctx->rx_ncm.dpe16[x].wDatagramLength);
1015
1016 /*
1017 * CDC NCM ch. 3.7
1018 * All entries after first NULL entry are to be ignored
1019 */
1020 if ((offset == 0) || (temp == 0)) {
1021 if (!x)
1022 goto error; /* empty NTB */
1023 break;
1024 }
1025
1026 /* sanity checking */
1027 if (((offset + temp) > actlen) ||
1028 (temp > CDC_NCM_MAX_DATAGRAM_SIZE) || (temp < ETH_HLEN)) {
1029 pr_debug("invalid frame detected (ignored)"
1030 "offset[%u]=%u, length=%u, skb=%p\n",
1031 x, offset, temp, skb_in);
1032 if (!x)
1033 goto error;
1034 break;
1035
1036 } else {
1037 skb = skb_clone(skb_in, GFP_ATOMIC);
1038 if (!skb)
1039 goto error;
1040 skb->len = temp;
1041 skb->data = ((u8 *)skb_in->data) + offset;
1042 skb_set_tail_pointer(skb, temp);
1043 usbnet_skb_return(dev, skb);
1044 }
1045 }
1046 return 1;
1047 error:
1048 return 0;
1049 }
1050
1051 static void
1052 cdc_ncm_speed_change(struct cdc_ncm_ctx *ctx,
1053 struct usb_cdc_speed_change *data)
1054 {
1055 uint32_t rx_speed = le32_to_cpu(data->DLBitRRate);
1056 uint32_t tx_speed = le32_to_cpu(data->ULBitRate);
1057
1058 /*
1059 * Currently the USB-NET API does not support reporting the actual
1060 * device speed. Do print it instead.
1061 */
1062 if ((tx_speed != ctx->tx_speed) || (rx_speed != ctx->rx_speed)) {
1063 ctx->tx_speed = tx_speed;
1064 ctx->rx_speed = rx_speed;
1065
1066 if ((tx_speed > 1000000) && (rx_speed > 1000000)) {
1067 printk(KERN_INFO KBUILD_MODNAME
1068 ": %s: %u mbit/s downlink "
1069 "%u mbit/s uplink\n",
1070 ctx->netdev->name,
1071 (unsigned int)(rx_speed / 1000000U),
1072 (unsigned int)(tx_speed / 1000000U));
1073 } else {
1074 printk(KERN_INFO KBUILD_MODNAME
1075 ": %s: %u kbit/s downlink "
1076 "%u kbit/s uplink\n",
1077 ctx->netdev->name,
1078 (unsigned int)(rx_speed / 1000U),
1079 (unsigned int)(tx_speed / 1000U));
1080 }
1081 }
1082 }
1083
1084 static void cdc_ncm_status(struct usbnet *dev, struct urb *urb)
1085 {
1086 struct cdc_ncm_ctx *ctx;
1087 struct usb_cdc_notification *event;
1088
1089 ctx = (struct cdc_ncm_ctx *)dev->data[0];
1090
1091 if (urb->actual_length < sizeof(*event))
1092 return;
1093
1094 /* test for split data in 8-byte chunks */
1095 if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
1096 cdc_ncm_speed_change(ctx,
1097 (struct usb_cdc_speed_change *)urb->transfer_buffer);
1098 return;
1099 }
1100
1101 event = urb->transfer_buffer;
1102
1103 switch (event->bNotificationType) {
1104 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
1105 /*
1106 * According to the CDC NCM specification ch.7.1
1107 * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be
1108 * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE.
1109 */
1110 ctx->connected = event->wValue;
1111
1112 printk(KERN_INFO KBUILD_MODNAME ": %s: network connection:"
1113 " %sconnected\n",
1114 ctx->netdev->name, ctx->connected ? "" : "dis");
1115
1116 if (ctx->connected)
1117 netif_carrier_on(dev->net);
1118 else {
1119 netif_carrier_off(dev->net);
1120 ctx->tx_speed = ctx->rx_speed = 0;
1121 }
1122 break;
1123
1124 case USB_CDC_NOTIFY_SPEED_CHANGE:
1125 if (urb->actual_length < (sizeof(*event) +
1126 sizeof(struct usb_cdc_speed_change)))
1127 set_bit(EVENT_STS_SPLIT, &dev->flags);
1128 else
1129 cdc_ncm_speed_change(ctx,
1130 (struct usb_cdc_speed_change *) &event[1]);
1131 break;
1132
1133 default:
1134 dev_err(&dev->udev->dev, "NCM: unexpected "
1135 "notification 0x%02x!\n", event->bNotificationType);
1136 break;
1137 }
1138 }
1139
1140 static int cdc_ncm_check_connect(struct usbnet *dev)
1141 {
1142 struct cdc_ncm_ctx *ctx;
1143
1144 ctx = (struct cdc_ncm_ctx *)dev->data[0];
1145 if (ctx == NULL)
1146 return 1; /* disconnected */
1147
1148 return !ctx->connected;
1149 }
1150
1151 static int
1152 cdc_ncm_probe(struct usb_interface *udev, const struct usb_device_id *prod)
1153 {
1154 return usbnet_probe(udev, prod);
1155 }
1156
1157 static void cdc_ncm_disconnect(struct usb_interface *intf)
1158 {
1159 struct usbnet *dev = usb_get_intfdata(intf);
1160
1161 if (dev == NULL)
1162 return; /* already disconnected */
1163
1164 usbnet_disconnect(intf);
1165 }
1166
1167 static int cdc_ncm_manage_power(struct usbnet *dev, int status)
1168 {
1169 dev->intf->needs_remote_wakeup = status;
1170 return 0;
1171 }
1172
1173 static const struct driver_info cdc_ncm_info = {
1174 .description = "CDC NCM",
1175 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET,
1176 .bind = cdc_ncm_bind,
1177 .unbind = cdc_ncm_unbind,
1178 .check_connect = cdc_ncm_check_connect,
1179 .manage_power = cdc_ncm_manage_power,
1180 .status = cdc_ncm_status,
1181 .rx_fixup = cdc_ncm_rx_fixup,
1182 .tx_fixup = cdc_ncm_tx_fixup,
1183 };
1184
1185 static struct usb_driver cdc_ncm_driver = {
1186 .name = "cdc_ncm",
1187 .id_table = cdc_devs,
1188 .probe = cdc_ncm_probe,
1189 .disconnect = cdc_ncm_disconnect,
1190 .suspend = usbnet_suspend,
1191 .resume = usbnet_resume,
1192 .reset_resume = usbnet_resume,
1193 .supports_autosuspend = 1,
1194 };
1195
1196 static struct ethtool_ops cdc_ncm_ethtool_ops = {
1197 .get_drvinfo = cdc_ncm_get_drvinfo,
1198 .get_link = usbnet_get_link,
1199 .get_msglevel = usbnet_get_msglevel,
1200 .set_msglevel = usbnet_set_msglevel,
1201 .get_settings = usbnet_get_settings,
1202 .set_settings = usbnet_set_settings,
1203 .nway_reset = usbnet_nway_reset,
1204 };
1205
1206 static int __init cdc_ncm_init(void)
1207 {
1208 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION "\n");
1209 return usb_register(&cdc_ncm_driver);
1210 }
1211
1212 module_init(cdc_ncm_init);
1213
1214 static void __exit cdc_ncm_exit(void)
1215 {
1216 usb_deregister(&cdc_ncm_driver);
1217 }
1218
1219 module_exit(cdc_ncm_exit);
1220
1221 MODULE_AUTHOR("Hans Petter Selasky");
1222 MODULE_DESCRIPTION("USB CDC NCM host driver");
1223 MODULE_LICENSE("Dual BSD/GPL");
Linux kernel - Deliverables
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