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net: cdc_ncm: fix SET_MAX_DATAGRAM_SIZE
[deliverable/linux.git] / drivers / net / usb / cdc_ncm.c
1 /*
2 * cdc_ncm.c
3 *
4 * Copyright (C) ST-Ericsson 2010-2012
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/hrtimer.h>
51 #include <linux/atomic.h>
52 #include <linux/usb/usbnet.h>
53 #include <linux/usb/cdc.h>
54 #include <linux/usb/cdc_ncm.h>
55
56 #define DRIVER_VERSION "14-Mar-2012"
57
58 #if IS_ENABLED(CONFIG_USB_NET_CDC_MBIM)
59 static bool prefer_mbim = true;
60 #else
61 static bool prefer_mbim;
62 #endif
63 module_param(prefer_mbim, bool, S_IRUGO | S_IWUSR);
64 MODULE_PARM_DESC(prefer_mbim, "Prefer MBIM setting on dual NCM/MBIM functions");
65
66 static void cdc_ncm_txpath_bh(unsigned long param);
67 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx);
68 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer);
69 static struct usb_driver cdc_ncm_driver;
70
71 static void
72 cdc_ncm_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info)
73 {
74 struct usbnet *dev = netdev_priv(net);
75
76 strlcpy(info->driver, dev->driver_name, sizeof(info->driver));
77 strlcpy(info->version, DRIVER_VERSION, sizeof(info->version));
78 strlcpy(info->fw_version, dev->driver_info->description,
79 sizeof(info->fw_version));
80 usb_make_path(dev->udev, info->bus_info, sizeof(info->bus_info));
81 }
82
83 static u8 cdc_ncm_setup(struct usbnet *dev)
84 {
85 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
86 struct usb_cdc_ncm_ntb_parameters ncm_parm;
87 u32 val;
88 u8 flags;
89 u8 iface_no;
90 int err;
91 int eth_hlen;
92 u16 ntb_fmt_supported;
93 u32 min_dgram_size;
94 u32 min_hdr_size;
95
96 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
97
98 err = usbnet_read_cmd(dev, USB_CDC_GET_NTB_PARAMETERS,
99 USB_TYPE_CLASS | USB_DIR_IN
100 |USB_RECIP_INTERFACE,
101 0, iface_no, &ncm_parm,
102 sizeof(ncm_parm));
103 if (err < 0) {
104 pr_debug("failed GET_NTB_PARAMETERS\n");
105 return 1;
106 }
107
108 /* read correct set of parameters according to device mode */
109 ctx->rx_max = le32_to_cpu(ncm_parm.dwNtbInMaxSize);
110 ctx->tx_max = le32_to_cpu(ncm_parm.dwNtbOutMaxSize);
111 ctx->tx_remainder = le16_to_cpu(ncm_parm.wNdpOutPayloadRemainder);
112 ctx->tx_modulus = le16_to_cpu(ncm_parm.wNdpOutDivisor);
113 ctx->tx_ndp_modulus = le16_to_cpu(ncm_parm.wNdpOutAlignment);
114 /* devices prior to NCM Errata shall set this field to zero */
115 ctx->tx_max_datagrams = le16_to_cpu(ncm_parm.wNtbOutMaxDatagrams);
116 ntb_fmt_supported = le16_to_cpu(ncm_parm.bmNtbFormatsSupported);
117
118 eth_hlen = ETH_HLEN;
119 min_dgram_size = CDC_NCM_MIN_DATAGRAM_SIZE;
120 min_hdr_size = CDC_NCM_MIN_HDR_SIZE;
121 if (ctx->mbim_desc != NULL) {
122 flags = ctx->mbim_desc->bmNetworkCapabilities;
123 eth_hlen = 0;
124 min_dgram_size = CDC_MBIM_MIN_DATAGRAM_SIZE;
125 min_hdr_size = 0;
126 } else if (ctx->func_desc != NULL) {
127 flags = ctx->func_desc->bmNetworkCapabilities;
128 } else {
129 flags = 0;
130 }
131
132 pr_debug("dwNtbInMaxSize=%u dwNtbOutMaxSize=%u "
133 "wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u "
134 "wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n",
135 ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus,
136 ctx->tx_ndp_modulus, ctx->tx_max_datagrams, flags);
137
138 /* max count of tx datagrams */
139 if ((ctx->tx_max_datagrams == 0) ||
140 (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX))
141 ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX;
142
143 /* verify maximum size of received NTB in bytes */
144 if (ctx->rx_max < USB_CDC_NCM_NTB_MIN_IN_SIZE) {
145 pr_debug("Using min receive length=%d\n",
146 USB_CDC_NCM_NTB_MIN_IN_SIZE);
147 ctx->rx_max = USB_CDC_NCM_NTB_MIN_IN_SIZE;
148 }
149
150 if (ctx->rx_max > CDC_NCM_NTB_MAX_SIZE_RX) {
151 pr_debug("Using default maximum receive length=%d\n",
152 CDC_NCM_NTB_MAX_SIZE_RX);
153 ctx->rx_max = CDC_NCM_NTB_MAX_SIZE_RX;
154 }
155
156 /* inform device about NTB input size changes */
157 if (ctx->rx_max != le32_to_cpu(ncm_parm.dwNtbInMaxSize)) {
158 __le32 dwNtbInMaxSize = cpu_to_le32(ctx->rx_max);
159
160 err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_INPUT_SIZE,
161 USB_TYPE_CLASS | USB_DIR_OUT
162 | USB_RECIP_INTERFACE,
163 0, iface_no, &dwNtbInMaxSize, 4);
164 if (err < 0)
165 pr_debug("Setting NTB Input Size failed\n");
166 }
167
168 /* verify maximum size of transmitted NTB in bytes */
169 if ((ctx->tx_max <
170 (min_hdr_size + min_dgram_size)) ||
171 (ctx->tx_max > CDC_NCM_NTB_MAX_SIZE_TX)) {
172 pr_debug("Using default maximum transmit length=%d\n",
173 CDC_NCM_NTB_MAX_SIZE_TX);
174 ctx->tx_max = CDC_NCM_NTB_MAX_SIZE_TX;
175
176 /* Adding a pad byte here simplifies the handling in
177 * cdc_ncm_fill_tx_frame, by making tx_max always
178 * represent the real skb max size.
179 */
180 if (ctx->tx_max % usb_maxpacket(dev->udev, dev->out, 1) == 0)
181 ctx->tx_max++;
182
183 }
184
185 /*
186 * verify that the structure alignment is:
187 * - power of two
188 * - not greater than the maximum transmit length
189 * - not less than four bytes
190 */
191 val = ctx->tx_ndp_modulus;
192
193 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
194 (val != ((-val) & val)) || (val >= ctx->tx_max)) {
195 pr_debug("Using default alignment: 4 bytes\n");
196 ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
197 }
198
199 /*
200 * verify that the payload alignment is:
201 * - power of two
202 * - not greater than the maximum transmit length
203 * - not less than four bytes
204 */
205 val = ctx->tx_modulus;
206
207 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
208 (val != ((-val) & val)) || (val >= ctx->tx_max)) {
209 pr_debug("Using default transmit modulus: 4 bytes\n");
210 ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
211 }
212
213 /* verify the payload remainder */
214 if (ctx->tx_remainder >= ctx->tx_modulus) {
215 pr_debug("Using default transmit remainder: 0 bytes\n");
216 ctx->tx_remainder = 0;
217 }
218
219 /* adjust TX-remainder according to NCM specification. */
220 ctx->tx_remainder = ((ctx->tx_remainder - eth_hlen) &
221 (ctx->tx_modulus - 1));
222
223 /* additional configuration */
224
225 /* set CRC Mode */
226 if (flags & USB_CDC_NCM_NCAP_CRC_MODE) {
227 err = usbnet_write_cmd(dev, USB_CDC_SET_CRC_MODE,
228 USB_TYPE_CLASS | USB_DIR_OUT
229 | USB_RECIP_INTERFACE,
230 USB_CDC_NCM_CRC_NOT_APPENDED,
231 iface_no, NULL, 0);
232 if (err < 0)
233 pr_debug("Setting CRC mode off failed\n");
234 }
235
236 /* set NTB format, if both formats are supported */
237 if (ntb_fmt_supported & USB_CDC_NCM_NTH32_SIGN) {
238 err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT,
239 USB_TYPE_CLASS | USB_DIR_OUT
240 | USB_RECIP_INTERFACE,
241 USB_CDC_NCM_NTB16_FORMAT,
242 iface_no, NULL, 0);
243 if (err < 0)
244 pr_debug("Setting NTB format to 16-bit failed\n");
245 }
246
247 ctx->max_datagram_size = min_dgram_size;
248
249 /* set Max Datagram Size (MTU) */
250 if (flags & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE) {
251 __le16 max_datagram_size;
252 u16 eth_max_sz;
253 if (ctx->ether_desc != NULL)
254 eth_max_sz = le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
255 else if (ctx->mbim_desc != NULL)
256 eth_max_sz = le16_to_cpu(ctx->mbim_desc->wMaxSegmentSize);
257 else
258 goto max_dgram_err;
259
260 err = usbnet_read_cmd(dev, USB_CDC_GET_MAX_DATAGRAM_SIZE,
261 USB_TYPE_CLASS | USB_DIR_IN
262 | USB_RECIP_INTERFACE,
263 0, iface_no, &max_datagram_size, 2);
264 if (err < 0) {
265 pr_debug("GET_MAX_DATAGRAM_SIZE failed, use size=%u\n",
266 min_dgram_size);
267 } else {
268 ctx->max_datagram_size =
269 le16_to_cpu(max_datagram_size);
270 /* Check Eth descriptor value */
271 if (ctx->max_datagram_size > eth_max_sz)
272 ctx->max_datagram_size = eth_max_sz;
273
274 if (ctx->max_datagram_size > CDC_NCM_MAX_DATAGRAM_SIZE)
275 ctx->max_datagram_size = CDC_NCM_MAX_DATAGRAM_SIZE;
276
277 if (ctx->max_datagram_size < min_dgram_size)
278 ctx->max_datagram_size = min_dgram_size;
279
280 /* if value changed, update device */
281 if (ctx->max_datagram_size !=
282 le16_to_cpu(max_datagram_size)) {
283 max_datagram_size = cpu_to_le16(ctx->max_datagram_size);
284 err = usbnet_write_cmd(dev,
285 USB_CDC_SET_MAX_DATAGRAM_SIZE,
286 USB_TYPE_CLASS | USB_DIR_OUT
287 | USB_RECIP_INTERFACE,
288 0,
289 iface_no, &max_datagram_size,
290 2);
291 if (err < 0)
292 pr_debug("SET_MAX_DGRAM_SIZE failed\n");
293 }
294 }
295 }
296
297 max_dgram_err:
298 if (dev->net->mtu != (ctx->max_datagram_size - eth_hlen))
299 dev->net->mtu = ctx->max_datagram_size - eth_hlen;
300
301 return 0;
302 }
303
304 static void
305 cdc_ncm_find_endpoints(struct usbnet *dev, struct usb_interface *intf)
306 {
307 struct usb_host_endpoint *e, *in = NULL, *out = NULL;
308 u8 ep;
309
310 for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) {
311
312 e = intf->cur_altsetting->endpoint + ep;
313 switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
314 case USB_ENDPOINT_XFER_INT:
315 if (usb_endpoint_dir_in(&e->desc)) {
316 if (!dev->status)
317 dev->status = e;
318 }
319 break;
320
321 case USB_ENDPOINT_XFER_BULK:
322 if (usb_endpoint_dir_in(&e->desc)) {
323 if (!in)
324 in = e;
325 } else {
326 if (!out)
327 out = e;
328 }
329 break;
330
331 default:
332 break;
333 }
334 }
335 if (in && !dev->in)
336 dev->in = usb_rcvbulkpipe(dev->udev,
337 in->desc.bEndpointAddress &
338 USB_ENDPOINT_NUMBER_MASK);
339 if (out && !dev->out)
340 dev->out = usb_sndbulkpipe(dev->udev,
341 out->desc.bEndpointAddress &
342 USB_ENDPOINT_NUMBER_MASK);
343 }
344
345 static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
346 {
347 if (ctx == NULL)
348 return;
349
350 if (ctx->tx_rem_skb != NULL) {
351 dev_kfree_skb_any(ctx->tx_rem_skb);
352 ctx->tx_rem_skb = NULL;
353 }
354
355 if (ctx->tx_curr_skb != NULL) {
356 dev_kfree_skb_any(ctx->tx_curr_skb);
357 ctx->tx_curr_skb = NULL;
358 }
359
360 kfree(ctx);
361 }
362
363 static const struct ethtool_ops cdc_ncm_ethtool_ops = {
364 .get_drvinfo = cdc_ncm_get_drvinfo,
365 .get_link = usbnet_get_link,
366 .get_msglevel = usbnet_get_msglevel,
367 .set_msglevel = usbnet_set_msglevel,
368 .get_settings = usbnet_get_settings,
369 .set_settings = usbnet_set_settings,
370 .nway_reset = usbnet_nway_reset,
371 };
372
373 int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting)
374 {
375 struct cdc_ncm_ctx *ctx;
376 struct usb_driver *driver;
377 u8 *buf;
378 int len;
379 int temp;
380 u8 iface_no;
381
382 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
383 if (!ctx)
384 return -ENOMEM;
385
386 hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
387 ctx->tx_timer.function = &cdc_ncm_tx_timer_cb;
388 ctx->bh.data = (unsigned long)dev;
389 ctx->bh.func = cdc_ncm_txpath_bh;
390 atomic_set(&ctx->stop, 0);
391 spin_lock_init(&ctx->mtx);
392
393 /* store ctx pointer in device data field */
394 dev->data[0] = (unsigned long)ctx;
395
396 /* get some pointers */
397 driver = driver_of(intf);
398 buf = intf->cur_altsetting->extra;
399 len = intf->cur_altsetting->extralen;
400
401 /* parse through descriptors associated with control interface */
402 while ((len > 0) && (buf[0] > 2) && (buf[0] <= len)) {
403
404 if (buf[1] != USB_DT_CS_INTERFACE)
405 goto advance;
406
407 switch (buf[2]) {
408 case USB_CDC_UNION_TYPE:
409 if (buf[0] < sizeof(*(ctx->union_desc)))
410 break;
411
412 ctx->union_desc =
413 (const struct usb_cdc_union_desc *)buf;
414
415 ctx->control = usb_ifnum_to_if(dev->udev,
416 ctx->union_desc->bMasterInterface0);
417 ctx->data = usb_ifnum_to_if(dev->udev,
418 ctx->union_desc->bSlaveInterface0);
419 break;
420
421 case USB_CDC_ETHERNET_TYPE:
422 if (buf[0] < sizeof(*(ctx->ether_desc)))
423 break;
424
425 ctx->ether_desc =
426 (const struct usb_cdc_ether_desc *)buf;
427 dev->hard_mtu =
428 le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
429
430 if (dev->hard_mtu < CDC_NCM_MIN_DATAGRAM_SIZE)
431 dev->hard_mtu = CDC_NCM_MIN_DATAGRAM_SIZE;
432 else if (dev->hard_mtu > CDC_NCM_MAX_DATAGRAM_SIZE)
433 dev->hard_mtu = CDC_NCM_MAX_DATAGRAM_SIZE;
434 break;
435
436 case USB_CDC_NCM_TYPE:
437 if (buf[0] < sizeof(*(ctx->func_desc)))
438 break;
439
440 ctx->func_desc = (const struct usb_cdc_ncm_desc *)buf;
441 break;
442
443 case USB_CDC_MBIM_TYPE:
444 if (buf[0] < sizeof(*(ctx->mbim_desc)))
445 break;
446
447 ctx->mbim_desc = (const struct usb_cdc_mbim_desc *)buf;
448 break;
449
450 default:
451 break;
452 }
453 advance:
454 /* advance to next descriptor */
455 temp = buf[0];
456 buf += temp;
457 len -= temp;
458 }
459
460 /* some buggy devices have an IAD but no CDC Union */
461 if (!ctx->union_desc && intf->intf_assoc && intf->intf_assoc->bInterfaceCount == 2) {
462 ctx->control = intf;
463 ctx->data = usb_ifnum_to_if(dev->udev, intf->cur_altsetting->desc.bInterfaceNumber + 1);
464 dev_dbg(&intf->dev, "CDC Union missing - got slave from IAD\n");
465 }
466
467 /* check if we got everything */
468 if ((ctx->control == NULL) || (ctx->data == NULL) ||
469 ((!ctx->mbim_desc) && ((ctx->ether_desc == NULL) || (ctx->control != intf))))
470 goto error;
471
472 /* claim data interface, if different from control */
473 if (ctx->data != ctx->control) {
474 temp = usb_driver_claim_interface(driver, ctx->data, dev);
475 if (temp)
476 goto error;
477 }
478
479 iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
480
481 /* reset data interface */
482 temp = usb_set_interface(dev->udev, iface_no, 0);
483 if (temp)
484 goto error2;
485
486 /* configure data interface */
487 temp = usb_set_interface(dev->udev, iface_no, data_altsetting);
488 if (temp)
489 goto error2;
490
491 cdc_ncm_find_endpoints(dev, ctx->data);
492 cdc_ncm_find_endpoints(dev, ctx->control);
493 if (!dev->in || !dev->out || !dev->status)
494 goto error2;
495
496 /* initialize data interface */
497 if (cdc_ncm_setup(dev))
498 goto error2;
499
500 dev->net->ethtool_ops = &cdc_ncm_ethtool_ops;
501
502 usb_set_intfdata(ctx->data, dev);
503 usb_set_intfdata(ctx->control, dev);
504
505 if (ctx->ether_desc) {
506 temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress);
507 if (temp)
508 goto error2;
509 dev_info(&dev->udev->dev, "MAC-Address: %pM\n", dev->net->dev_addr);
510 }
511
512 dev->rx_urb_size = ctx->rx_max;
513
514 return 0;
515
516 error2:
517 usb_set_intfdata(ctx->control, NULL);
518 usb_set_intfdata(ctx->data, NULL);
519 if (ctx->data != ctx->control)
520 usb_driver_release_interface(driver, ctx->data);
521 error:
522 cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
523 dev->data[0] = 0;
524 dev_info(&dev->udev->dev, "bind() failure\n");
525 return -ENODEV;
526 }
527 EXPORT_SYMBOL_GPL(cdc_ncm_bind_common);
528
529 void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)
530 {
531 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
532 struct usb_driver *driver = driver_of(intf);
533
534 if (ctx == NULL)
535 return; /* no setup */
536
537 atomic_set(&ctx->stop, 1);
538
539 if (hrtimer_active(&ctx->tx_timer))
540 hrtimer_cancel(&ctx->tx_timer);
541
542 tasklet_kill(&ctx->bh);
543
544 /* handle devices with combined control and data interface */
545 if (ctx->control == ctx->data)
546 ctx->data = NULL;
547
548 /* disconnect master --> disconnect slave */
549 if (intf == ctx->control && ctx->data) {
550 usb_set_intfdata(ctx->data, NULL);
551 usb_driver_release_interface(driver, ctx->data);
552 ctx->data = NULL;
553
554 } else if (intf == ctx->data && ctx->control) {
555 usb_set_intfdata(ctx->control, NULL);
556 usb_driver_release_interface(driver, ctx->control);
557 ctx->control = NULL;
558 }
559
560 usb_set_intfdata(intf, NULL);
561 cdc_ncm_free(ctx);
562 }
563 EXPORT_SYMBOL_GPL(cdc_ncm_unbind);
564
565 /* Select the MBIM altsetting iff it is preferred and available,
566 * returning the number of the corresponding data interface altsetting
567 */
568 u8 cdc_ncm_select_altsetting(struct usbnet *dev, struct usb_interface *intf)
569 {
570 struct usb_host_interface *alt;
571
572 /* The MBIM spec defines a NCM compatible default altsetting,
573 * which we may have matched:
574 *
575 * "Functions that implement both NCM 1.0 and MBIM (an
576 * “NCM/MBIM function”) according to this recommendation
577 * shall provide two alternate settings for the
578 * Communication Interface. Alternate setting 0, and the
579 * associated class and endpoint descriptors, shall be
580 * constructed according to the rules given for the
581 * Communication Interface in section 5 of [USBNCM10].
582 * Alternate setting 1, and the associated class and
583 * endpoint descriptors, shall be constructed according to
584 * the rules given in section 6 (USB Device Model) of this
585 * specification."
586 */
587 if (prefer_mbim && intf->num_altsetting == 2) {
588 alt = usb_altnum_to_altsetting(intf, CDC_NCM_COMM_ALTSETTING_MBIM);
589 if (alt && cdc_ncm_comm_intf_is_mbim(alt) &&
590 !usb_set_interface(dev->udev,
591 intf->cur_altsetting->desc.bInterfaceNumber,
592 CDC_NCM_COMM_ALTSETTING_MBIM))
593 return CDC_NCM_DATA_ALTSETTING_MBIM;
594 }
595 return CDC_NCM_DATA_ALTSETTING_NCM;
596 }
597 EXPORT_SYMBOL_GPL(cdc_ncm_select_altsetting);
598
599 static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
600 {
601 int ret;
602
603 /* MBIM backwards compatible function? */
604 cdc_ncm_select_altsetting(dev, intf);
605 if (cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting))
606 return -ENODEV;
607
608 /* NCM data altsetting is always 1 */
609 ret = cdc_ncm_bind_common(dev, intf, 1);
610
611 /*
612 * We should get an event when network connection is "connected" or
613 * "disconnected". Set network connection in "disconnected" state
614 * (carrier is OFF) during attach, so the IP network stack does not
615 * start IPv6 negotiation and more.
616 */
617 usbnet_link_change(dev, 0, 0);
618 return ret;
619 }
620
621 static void cdc_ncm_align_tail(struct sk_buff *skb, size_t modulus, size_t remainder, size_t max)
622 {
623 size_t align = ALIGN(skb->len, modulus) - skb->len + remainder;
624
625 if (skb->len + align > max)
626 align = max - skb->len;
627 if (align && skb_tailroom(skb) >= align)
628 memset(skb_put(skb, align), 0, align);
629 }
630
631 /* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly
632 * allocating a new one within skb
633 */
634 static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve)
635 {
636 struct usb_cdc_ncm_ndp16 *ndp16 = NULL;
637 struct usb_cdc_ncm_nth16 *nth16 = (void *)skb->data;
638 size_t ndpoffset = le16_to_cpu(nth16->wNdpIndex);
639
640 /* follow the chain of NDPs, looking for a match */
641 while (ndpoffset) {
642 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset);
643 if (ndp16->dwSignature == sign)
644 return ndp16;
645 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
646 }
647
648 /* align new NDP */
649 cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_max);
650
651 /* verify that there is room for the NDP and the datagram (reserve) */
652 if ((ctx->tx_max - skb->len - reserve) < CDC_NCM_NDP_SIZE)
653 return NULL;
654
655 /* link to it */
656 if (ndp16)
657 ndp16->wNextNdpIndex = cpu_to_le16(skb->len);
658 else
659 nth16->wNdpIndex = cpu_to_le16(skb->len);
660
661 /* push a new empty NDP */
662 ndp16 = (struct usb_cdc_ncm_ndp16 *)memset(skb_put(skb, CDC_NCM_NDP_SIZE), 0, CDC_NCM_NDP_SIZE);
663 ndp16->dwSignature = sign;
664 ndp16->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16) + sizeof(struct usb_cdc_ncm_dpe16));
665 return ndp16;
666 }
667
668 struct sk_buff *
669 cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign)
670 {
671 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
672 struct usb_cdc_ncm_nth16 *nth16;
673 struct usb_cdc_ncm_ndp16 *ndp16;
674 struct sk_buff *skb_out;
675 u16 n = 0, index, ndplen;
676 u8 ready2send = 0;
677
678 /* if there is a remaining skb, it gets priority */
679 if (skb != NULL) {
680 swap(skb, ctx->tx_rem_skb);
681 swap(sign, ctx->tx_rem_sign);
682 } else {
683 ready2send = 1;
684 }
685
686 /* check if we are resuming an OUT skb */
687 skb_out = ctx->tx_curr_skb;
688
689 /* allocate a new OUT skb */
690 if (!skb_out) {
691 skb_out = alloc_skb(ctx->tx_max, GFP_ATOMIC);
692 if (skb_out == NULL) {
693 if (skb != NULL) {
694 dev_kfree_skb_any(skb);
695 dev->net->stats.tx_dropped++;
696 }
697 goto exit_no_skb;
698 }
699 /* fill out the initial 16-bit NTB header */
700 nth16 = (struct usb_cdc_ncm_nth16 *)memset(skb_put(skb_out, sizeof(struct usb_cdc_ncm_nth16)), 0, sizeof(struct usb_cdc_ncm_nth16));
701 nth16->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
702 nth16->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16));
703 nth16->wSequence = cpu_to_le16(ctx->tx_seq++);
704
705 /* count total number of frames in this NTB */
706 ctx->tx_curr_frame_num = 0;
707 }
708
709 for (n = ctx->tx_curr_frame_num; n < ctx->tx_max_datagrams; n++) {
710 /* send any remaining skb first */
711 if (skb == NULL) {
712 skb = ctx->tx_rem_skb;
713 sign = ctx->tx_rem_sign;
714 ctx->tx_rem_skb = NULL;
715
716 /* check for end of skb */
717 if (skb == NULL)
718 break;
719 }
720
721 /* get the appropriate NDP for this skb */
722 ndp16 = cdc_ncm_ndp(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder);
723
724 /* align beginning of next frame */
725 cdc_ncm_align_tail(skb_out, ctx->tx_modulus, ctx->tx_remainder, ctx->tx_max);
726
727 /* check if we had enough room left for both NDP and frame */
728 if (!ndp16 || skb_out->len + skb->len > ctx->tx_max) {
729 if (n == 0) {
730 /* won't fit, MTU problem? */
731 dev_kfree_skb_any(skb);
732 skb = NULL;
733 dev->net->stats.tx_dropped++;
734 } else {
735 /* no room for skb - store for later */
736 if (ctx->tx_rem_skb != NULL) {
737 dev_kfree_skb_any(ctx->tx_rem_skb);
738 dev->net->stats.tx_dropped++;
739 }
740 ctx->tx_rem_skb = skb;
741 ctx->tx_rem_sign = sign;
742 skb = NULL;
743 ready2send = 1;
744 }
745 break;
746 }
747
748 /* calculate frame number withing this NDP */
749 ndplen = le16_to_cpu(ndp16->wLength);
750 index = (ndplen - sizeof(struct usb_cdc_ncm_ndp16)) / sizeof(struct usb_cdc_ncm_dpe16) - 1;
751
752 /* OK, add this skb */
753 ndp16->dpe16[index].wDatagramLength = cpu_to_le16(skb->len);
754 ndp16->dpe16[index].wDatagramIndex = cpu_to_le16(skb_out->len);
755 ndp16->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe16));
756 memcpy(skb_put(skb_out, skb->len), skb->data, skb->len);
757 dev_kfree_skb_any(skb);
758 skb = NULL;
759
760 /* send now if this NDP is full */
761 if (index >= CDC_NCM_DPT_DATAGRAMS_MAX) {
762 ready2send = 1;
763 break;
764 }
765 }
766
767 /* free up any dangling skb */
768 if (skb != NULL) {
769 dev_kfree_skb_any(skb);
770 skb = NULL;
771 dev->net->stats.tx_dropped++;
772 }
773
774 ctx->tx_curr_frame_num = n;
775
776 if (n == 0) {
777 /* wait for more frames */
778 /* push variables */
779 ctx->tx_curr_skb = skb_out;
780 goto exit_no_skb;
781
782 } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0)) {
783 /* wait for more frames */
784 /* push variables */
785 ctx->tx_curr_skb = skb_out;
786 /* set the pending count */
787 if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT)
788 ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT;
789 goto exit_no_skb;
790
791 } else {
792 /* frame goes out */
793 /* variables will be reset at next call */
794 }
795
796 /* If collected data size is less or equal CDC_NCM_MIN_TX_PKT
797 * bytes, we send buffers as it is. If we get more data, it
798 * would be more efficient for USB HS mobile device with DMA
799 * engine to receive a full size NTB, than canceling DMA
800 * transfer and receiving a short packet.
801 */
802 if (skb_out->len > CDC_NCM_MIN_TX_PKT)
803 memset(skb_put(skb_out, ctx->tx_max - skb_out->len), 0,
804 ctx->tx_max - skb_out->len);
805 else if ((skb_out->len % dev->maxpacket) == 0)
806 *skb_put(skb_out, 1) = 0; /* force short packet */
807
808 /* set final frame length */
809 nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
810 nth16->wBlockLength = cpu_to_le16(skb_out->len);
811
812 /* return skb */
813 ctx->tx_curr_skb = NULL;
814 dev->net->stats.tx_packets += ctx->tx_curr_frame_num;
815 return skb_out;
816
817 exit_no_skb:
818 /* Start timer, if there is a remaining skb */
819 if (ctx->tx_curr_skb != NULL)
820 cdc_ncm_tx_timeout_start(ctx);
821 return NULL;
822 }
823 EXPORT_SYMBOL_GPL(cdc_ncm_fill_tx_frame);
824
825 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx)
826 {
827 /* start timer, if not already started */
828 if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop)))
829 hrtimer_start(&ctx->tx_timer,
830 ktime_set(0, CDC_NCM_TIMER_INTERVAL),
831 HRTIMER_MODE_REL);
832 }
833
834 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer)
835 {
836 struct cdc_ncm_ctx *ctx =
837 container_of(timer, struct cdc_ncm_ctx, tx_timer);
838
839 if (!atomic_read(&ctx->stop))
840 tasklet_schedule(&ctx->bh);
841 return HRTIMER_NORESTART;
842 }
843
844 static void cdc_ncm_txpath_bh(unsigned long param)
845 {
846 struct usbnet *dev = (struct usbnet *)param;
847 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
848
849 spin_lock_bh(&ctx->mtx);
850 if (ctx->tx_timer_pending != 0) {
851 ctx->tx_timer_pending--;
852 cdc_ncm_tx_timeout_start(ctx);
853 spin_unlock_bh(&ctx->mtx);
854 } else if (dev->net != NULL) {
855 spin_unlock_bh(&ctx->mtx);
856 netif_tx_lock_bh(dev->net);
857 usbnet_start_xmit(NULL, dev->net);
858 netif_tx_unlock_bh(dev->net);
859 } else {
860 spin_unlock_bh(&ctx->mtx);
861 }
862 }
863
864 static struct sk_buff *
865 cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
866 {
867 struct sk_buff *skb_out;
868 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
869
870 /*
871 * The Ethernet API we are using does not support transmitting
872 * multiple Ethernet frames in a single call. This driver will
873 * accumulate multiple Ethernet frames and send out a larger
874 * USB frame when the USB buffer is full or when a single jiffies
875 * timeout happens.
876 */
877 if (ctx == NULL)
878 goto error;
879
880 spin_lock_bh(&ctx->mtx);
881 skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN));
882 spin_unlock_bh(&ctx->mtx);
883 return skb_out;
884
885 error:
886 if (skb != NULL)
887 dev_kfree_skb_any(skb);
888
889 return NULL;
890 }
891
892 /* verify NTB header and return offset of first NDP, or negative error */
893 int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in)
894 {
895 struct usb_cdc_ncm_nth16 *nth16;
896 int len;
897 int ret = -EINVAL;
898
899 if (ctx == NULL)
900 goto error;
901
902 if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) +
903 sizeof(struct usb_cdc_ncm_ndp16))) {
904 pr_debug("frame too short\n");
905 goto error;
906 }
907
908 nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data;
909
910 if (le32_to_cpu(nth16->dwSignature) != USB_CDC_NCM_NTH16_SIGN) {
911 pr_debug("invalid NTH16 signature <%u>\n",
912 le32_to_cpu(nth16->dwSignature));
913 goto error;
914 }
915
916 len = le16_to_cpu(nth16->wBlockLength);
917 if (len > ctx->rx_max) {
918 pr_debug("unsupported NTB block length %u/%u\n", len,
919 ctx->rx_max);
920 goto error;
921 }
922
923 if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) &&
924 (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) &&
925 !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) {
926 pr_debug("sequence number glitch prev=%d curr=%d\n",
927 ctx->rx_seq, le16_to_cpu(nth16->wSequence));
928 }
929 ctx->rx_seq = le16_to_cpu(nth16->wSequence);
930
931 ret = le16_to_cpu(nth16->wNdpIndex);
932 error:
933 return ret;
934 }
935 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth16);
936
937 /* verify NDP header and return number of datagrams, or negative error */
938 int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset)
939 {
940 struct usb_cdc_ncm_ndp16 *ndp16;
941 int ret = -EINVAL;
942
943 if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) {
944 pr_debug("invalid NDP offset <%u>\n", ndpoffset);
945 goto error;
946 }
947 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
948
949 if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) {
950 pr_debug("invalid DPT16 length <%u>\n",
951 le32_to_cpu(ndp16->dwSignature));
952 goto error;
953 }
954
955 ret = ((le16_to_cpu(ndp16->wLength) -
956 sizeof(struct usb_cdc_ncm_ndp16)) /
957 sizeof(struct usb_cdc_ncm_dpe16));
958 ret--; /* we process NDP entries except for the last one */
959
960 if ((sizeof(struct usb_cdc_ncm_ndp16) + ret * (sizeof(struct usb_cdc_ncm_dpe16))) >
961 skb_in->len) {
962 pr_debug("Invalid nframes = %d\n", ret);
963 ret = -EINVAL;
964 }
965
966 error:
967 return ret;
968 }
969 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp16);
970
971 static int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
972 {
973 struct sk_buff *skb;
974 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
975 int len;
976 int nframes;
977 int x;
978 int offset;
979 struct usb_cdc_ncm_ndp16 *ndp16;
980 struct usb_cdc_ncm_dpe16 *dpe16;
981 int ndpoffset;
982 int loopcount = 50; /* arbitrary max preventing infinite loop */
983
984 ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in);
985 if (ndpoffset < 0)
986 goto error;
987
988 next_ndp:
989 nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset);
990 if (nframes < 0)
991 goto error;
992
993 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
994
995 if (le32_to_cpu(ndp16->dwSignature) != USB_CDC_NCM_NDP16_NOCRC_SIGN) {
996 pr_debug("invalid DPT16 signature <%u>\n",
997 le32_to_cpu(ndp16->dwSignature));
998 goto err_ndp;
999 }
1000 dpe16 = ndp16->dpe16;
1001
1002 for (x = 0; x < nframes; x++, dpe16++) {
1003 offset = le16_to_cpu(dpe16->wDatagramIndex);
1004 len = le16_to_cpu(dpe16->wDatagramLength);
1005
1006 /*
1007 * CDC NCM ch. 3.7
1008 * All entries after first NULL entry are to be ignored
1009 */
1010 if ((offset == 0) || (len == 0)) {
1011 if (!x)
1012 goto err_ndp; /* empty NTB */
1013 break;
1014 }
1015
1016 /* sanity checking */
1017 if (((offset + len) > skb_in->len) ||
1018 (len > ctx->rx_max) || (len < ETH_HLEN)) {
1019 pr_debug("invalid frame detected (ignored)"
1020 "offset[%u]=%u, length=%u, skb=%p\n",
1021 x, offset, len, skb_in);
1022 if (!x)
1023 goto err_ndp;
1024 break;
1025
1026 } else {
1027 skb = skb_clone(skb_in, GFP_ATOMIC);
1028 if (!skb)
1029 goto error;
1030 skb->len = len;
1031 skb->data = ((u8 *)skb_in->data) + offset;
1032 skb_set_tail_pointer(skb, len);
1033 usbnet_skb_return(dev, skb);
1034 }
1035 }
1036 err_ndp:
1037 /* are there more NDPs to process? */
1038 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
1039 if (ndpoffset && loopcount--)
1040 goto next_ndp;
1041
1042 return 1;
1043 error:
1044 return 0;
1045 }
1046
1047 static void
1048 cdc_ncm_speed_change(struct usbnet *dev,
1049 struct usb_cdc_speed_change *data)
1050 {
1051 uint32_t rx_speed = le32_to_cpu(data->DLBitRRate);
1052 uint32_t tx_speed = le32_to_cpu(data->ULBitRate);
1053
1054 /*
1055 * Currently the USB-NET API does not support reporting the actual
1056 * device speed. Do print it instead.
1057 */
1058 if ((tx_speed > 1000000) && (rx_speed > 1000000)) {
1059 printk(KERN_INFO KBUILD_MODNAME
1060 ": %s: %u mbit/s downlink "
1061 "%u mbit/s uplink\n",
1062 dev->net->name,
1063 (unsigned int)(rx_speed / 1000000U),
1064 (unsigned int)(tx_speed / 1000000U));
1065 } else {
1066 printk(KERN_INFO KBUILD_MODNAME
1067 ": %s: %u kbit/s downlink "
1068 "%u kbit/s uplink\n",
1069 dev->net->name,
1070 (unsigned int)(rx_speed / 1000U),
1071 (unsigned int)(tx_speed / 1000U));
1072 }
1073 }
1074
1075 static void cdc_ncm_status(struct usbnet *dev, struct urb *urb)
1076 {
1077 struct cdc_ncm_ctx *ctx;
1078 struct usb_cdc_notification *event;
1079
1080 ctx = (struct cdc_ncm_ctx *)dev->data[0];
1081
1082 if (urb->actual_length < sizeof(*event))
1083 return;
1084
1085 /* test for split data in 8-byte chunks */
1086 if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
1087 cdc_ncm_speed_change(dev,
1088 (struct usb_cdc_speed_change *)urb->transfer_buffer);
1089 return;
1090 }
1091
1092 event = urb->transfer_buffer;
1093
1094 switch (event->bNotificationType) {
1095 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
1096 /*
1097 * According to the CDC NCM specification ch.7.1
1098 * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be
1099 * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE.
1100 */
1101 ctx->connected = le16_to_cpu(event->wValue);
1102
1103 printk(KERN_INFO KBUILD_MODNAME ": %s: network connection:"
1104 " %sconnected\n",
1105 dev->net->name, ctx->connected ? "" : "dis");
1106
1107 usbnet_link_change(dev, ctx->connected, 0);
1108 break;
1109
1110 case USB_CDC_NOTIFY_SPEED_CHANGE:
1111 if (urb->actual_length < (sizeof(*event) +
1112 sizeof(struct usb_cdc_speed_change)))
1113 set_bit(EVENT_STS_SPLIT, &dev->flags);
1114 else
1115 cdc_ncm_speed_change(dev,
1116 (struct usb_cdc_speed_change *)&event[1]);
1117 break;
1118
1119 default:
1120 dev_dbg(&dev->udev->dev,
1121 "NCM: unexpected notification 0x%02x!\n",
1122 event->bNotificationType);
1123 break;
1124 }
1125 }
1126
1127 static int cdc_ncm_check_connect(struct usbnet *dev)
1128 {
1129 struct cdc_ncm_ctx *ctx;
1130
1131 ctx = (struct cdc_ncm_ctx *)dev->data[0];
1132 if (ctx == NULL)
1133 return 1; /* disconnected */
1134
1135 return !ctx->connected;
1136 }
1137
1138 static int
1139 cdc_ncm_probe(struct usb_interface *udev, const struct usb_device_id *prod)
1140 {
1141 return usbnet_probe(udev, prod);
1142 }
1143
1144 static void cdc_ncm_disconnect(struct usb_interface *intf)
1145 {
1146 struct usbnet *dev = usb_get_intfdata(intf);
1147
1148 if (dev == NULL)
1149 return; /* already disconnected */
1150
1151 usbnet_disconnect(intf);
1152 }
1153
1154 static const struct driver_info cdc_ncm_info = {
1155 .description = "CDC NCM",
1156 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET,
1157 .bind = cdc_ncm_bind,
1158 .unbind = cdc_ncm_unbind,
1159 .check_connect = cdc_ncm_check_connect,
1160 .manage_power = usbnet_manage_power,
1161 .status = cdc_ncm_status,
1162 .rx_fixup = cdc_ncm_rx_fixup,
1163 .tx_fixup = cdc_ncm_tx_fixup,
1164 };
1165
1166 /* Same as cdc_ncm_info, but with FLAG_WWAN */
1167 static const struct driver_info wwan_info = {
1168 .description = "Mobile Broadband Network Device",
1169 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1170 | FLAG_WWAN,
1171 .bind = cdc_ncm_bind,
1172 .unbind = cdc_ncm_unbind,
1173 .check_connect = cdc_ncm_check_connect,
1174 .manage_power = usbnet_manage_power,
1175 .status = cdc_ncm_status,
1176 .rx_fixup = cdc_ncm_rx_fixup,
1177 .tx_fixup = cdc_ncm_tx_fixup,
1178 };
1179
1180 /* Same as wwan_info, but with FLAG_NOARP */
1181 static const struct driver_info wwan_noarp_info = {
1182 .description = "Mobile Broadband Network Device (NO ARP)",
1183 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1184 | FLAG_WWAN | FLAG_NOARP,
1185 .bind = cdc_ncm_bind,
1186 .unbind = cdc_ncm_unbind,
1187 .check_connect = cdc_ncm_check_connect,
1188 .manage_power = usbnet_manage_power,
1189 .status = cdc_ncm_status,
1190 .rx_fixup = cdc_ncm_rx_fixup,
1191 .tx_fixup = cdc_ncm_tx_fixup,
1192 };
1193
1194 static const struct usb_device_id cdc_devs[] = {
1195 /* Ericsson MBM devices like F5521gw */
1196 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1197 | USB_DEVICE_ID_MATCH_VENDOR,
1198 .idVendor = 0x0bdb,
1199 .bInterfaceClass = USB_CLASS_COMM,
1200 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1201 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1202 .driver_info = (unsigned long) &wwan_info,
1203 },
1204
1205 /* Dell branded MBM devices like DW5550 */
1206 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1207 | USB_DEVICE_ID_MATCH_VENDOR,
1208 .idVendor = 0x413c,
1209 .bInterfaceClass = USB_CLASS_COMM,
1210 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1211 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1212 .driver_info = (unsigned long) &wwan_info,
1213 },
1214
1215 /* Toshiba branded MBM devices */
1216 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1217 | USB_DEVICE_ID_MATCH_VENDOR,
1218 .idVendor = 0x0930,
1219 .bInterfaceClass = USB_CLASS_COMM,
1220 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1221 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1222 .driver_info = (unsigned long) &wwan_info,
1223 },
1224
1225 /* tag Huawei devices as wwan */
1226 { USB_VENDOR_AND_INTERFACE_INFO(0x12d1,
1227 USB_CLASS_COMM,
1228 USB_CDC_SUBCLASS_NCM,
1229 USB_CDC_PROTO_NONE),
1230 .driver_info = (unsigned long)&wwan_info,
1231 },
1232
1233 /* Huawei NCM devices disguised as vendor specific */
1234 { USB_VENDOR_AND_INTERFACE_INFO(0x12d1, 0xff, 0x02, 0x16),
1235 .driver_info = (unsigned long)&wwan_info,
1236 },
1237 { USB_VENDOR_AND_INTERFACE_INFO(0x12d1, 0xff, 0x02, 0x46),
1238 .driver_info = (unsigned long)&wwan_info,
1239 },
1240 { USB_VENDOR_AND_INTERFACE_INFO(0x12d1, 0xff, 0x02, 0x76),
1241 .driver_info = (unsigned long)&wwan_info,
1242 },
1243
1244 /* Infineon(now Intel) HSPA Modem platform */
1245 { USB_DEVICE_AND_INTERFACE_INFO(0x1519, 0x0443,
1246 USB_CLASS_COMM,
1247 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1248 .driver_info = (unsigned long)&wwan_noarp_info,
1249 },
1250
1251 /* Generic CDC-NCM devices */
1252 { USB_INTERFACE_INFO(USB_CLASS_COMM,
1253 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1254 .driver_info = (unsigned long)&cdc_ncm_info,
1255 },
1256 {
1257 },
1258 };
1259 MODULE_DEVICE_TABLE(usb, cdc_devs);
1260
1261 static struct usb_driver cdc_ncm_driver = {
1262 .name = "cdc_ncm",
1263 .id_table = cdc_devs,
1264 .probe = cdc_ncm_probe,
1265 .disconnect = cdc_ncm_disconnect,
1266 .suspend = usbnet_suspend,
1267 .resume = usbnet_resume,
1268 .reset_resume = usbnet_resume,
1269 .supports_autosuspend = 1,
1270 .disable_hub_initiated_lpm = 1,
1271 };
1272
1273 module_usb_driver(cdc_ncm_driver);
1274
1275 MODULE_AUTHOR("Hans Petter Selasky");
1276 MODULE_DESCRIPTION("USB CDC NCM host driver");
1277 MODULE_LICENSE("Dual BSD/GPL");
Linux kernel - Deliverables
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