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net: cdc_ncm: no point in filling up the NTBs if we send ZLPs
[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 const struct usb_cdc_union_desc *union_desc = NULL;
376 struct cdc_ncm_ctx *ctx;
377 struct usb_driver *driver;
378 u8 *buf;
379 int len;
380 int temp;
381 u8 iface_no;
382
383 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
384 if (!ctx)
385 return -ENOMEM;
386
387 hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
388 ctx->tx_timer.function = &cdc_ncm_tx_timer_cb;
389 ctx->bh.data = (unsigned long)dev;
390 ctx->bh.func = cdc_ncm_txpath_bh;
391 atomic_set(&ctx->stop, 0);
392 spin_lock_init(&ctx->mtx);
393
394 /* store ctx pointer in device data field */
395 dev->data[0] = (unsigned long)ctx;
396
397 /* only the control interface can be successfully probed */
398 ctx->control = intf;
399
400 /* get some pointers */
401 driver = driver_of(intf);
402 buf = intf->cur_altsetting->extra;
403 len = intf->cur_altsetting->extralen;
404
405 /* parse through descriptors associated with control interface */
406 while ((len > 0) && (buf[0] > 2) && (buf[0] <= len)) {
407
408 if (buf[1] != USB_DT_CS_INTERFACE)
409 goto advance;
410
411 switch (buf[2]) {
412 case USB_CDC_UNION_TYPE:
413 if (buf[0] < sizeof(*union_desc))
414 break;
415
416 union_desc = (const struct usb_cdc_union_desc *)buf;
417 /* the master must be the interface we are probing */
418 if (intf->cur_altsetting->desc.bInterfaceNumber !=
419 union_desc->bMasterInterface0)
420 goto error;
421 ctx->data = usb_ifnum_to_if(dev->udev,
422 union_desc->bSlaveInterface0);
423 break;
424
425 case USB_CDC_ETHERNET_TYPE:
426 if (buf[0] < sizeof(*(ctx->ether_desc)))
427 break;
428
429 ctx->ether_desc =
430 (const struct usb_cdc_ether_desc *)buf;
431 dev->hard_mtu =
432 le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
433
434 if (dev->hard_mtu < CDC_NCM_MIN_DATAGRAM_SIZE)
435 dev->hard_mtu = CDC_NCM_MIN_DATAGRAM_SIZE;
436 else if (dev->hard_mtu > CDC_NCM_MAX_DATAGRAM_SIZE)
437 dev->hard_mtu = CDC_NCM_MAX_DATAGRAM_SIZE;
438 break;
439
440 case USB_CDC_NCM_TYPE:
441 if (buf[0] < sizeof(*(ctx->func_desc)))
442 break;
443
444 ctx->func_desc = (const struct usb_cdc_ncm_desc *)buf;
445 break;
446
447 case USB_CDC_MBIM_TYPE:
448 if (buf[0] < sizeof(*(ctx->mbim_desc)))
449 break;
450
451 ctx->mbim_desc = (const struct usb_cdc_mbim_desc *)buf;
452 break;
453
454 default:
455 break;
456 }
457 advance:
458 /* advance to next descriptor */
459 temp = buf[0];
460 buf += temp;
461 len -= temp;
462 }
463
464 /* some buggy devices have an IAD but no CDC Union */
465 if (!union_desc && intf->intf_assoc && intf->intf_assoc->bInterfaceCount == 2) {
466 ctx->data = usb_ifnum_to_if(dev->udev, intf->cur_altsetting->desc.bInterfaceNumber + 1);
467 dev_dbg(&intf->dev, "CDC Union missing - got slave from IAD\n");
468 }
469
470 /* check if we got everything */
471 if (!ctx->data || (!ctx->mbim_desc && !ctx->ether_desc))
472 goto error;
473
474 /* claim data interface, if different from control */
475 if (ctx->data != ctx->control) {
476 temp = usb_driver_claim_interface(driver, ctx->data, dev);
477 if (temp)
478 goto error;
479 }
480
481 iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
482
483 /* reset data interface */
484 temp = usb_set_interface(dev->udev, iface_no, 0);
485 if (temp)
486 goto error2;
487
488 /* configure data interface */
489 temp = usb_set_interface(dev->udev, iface_no, data_altsetting);
490 if (temp)
491 goto error2;
492
493 cdc_ncm_find_endpoints(dev, ctx->data);
494 cdc_ncm_find_endpoints(dev, ctx->control);
495 if (!dev->in || !dev->out || !dev->status)
496 goto error2;
497
498 /* initialize data interface */
499 if (cdc_ncm_setup(dev))
500 goto error2;
501
502 dev->net->ethtool_ops = &cdc_ncm_ethtool_ops;
503
504 usb_set_intfdata(ctx->data, dev);
505 usb_set_intfdata(ctx->control, dev);
506
507 if (ctx->ether_desc) {
508 temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress);
509 if (temp)
510 goto error2;
511 dev_info(&dev->udev->dev, "MAC-Address: %pM\n", dev->net->dev_addr);
512 }
513
514 dev->rx_urb_size = ctx->rx_max;
515
516 return 0;
517
518 error2:
519 usb_set_intfdata(ctx->control, NULL);
520 usb_set_intfdata(ctx->data, NULL);
521 if (ctx->data != ctx->control)
522 usb_driver_release_interface(driver, ctx->data);
523 error:
524 cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
525 dev->data[0] = 0;
526 dev_info(&dev->udev->dev, "bind() failure\n");
527 return -ENODEV;
528 }
529 EXPORT_SYMBOL_GPL(cdc_ncm_bind_common);
530
531 void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)
532 {
533 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
534 struct usb_driver *driver = driver_of(intf);
535
536 if (ctx == NULL)
537 return; /* no setup */
538
539 atomic_set(&ctx->stop, 1);
540
541 if (hrtimer_active(&ctx->tx_timer))
542 hrtimer_cancel(&ctx->tx_timer);
543
544 tasklet_kill(&ctx->bh);
545
546 /* handle devices with combined control and data interface */
547 if (ctx->control == ctx->data)
548 ctx->data = NULL;
549
550 /* disconnect master --> disconnect slave */
551 if (intf == ctx->control && ctx->data) {
552 usb_set_intfdata(ctx->data, NULL);
553 usb_driver_release_interface(driver, ctx->data);
554 ctx->data = NULL;
555
556 } else if (intf == ctx->data && ctx->control) {
557 usb_set_intfdata(ctx->control, NULL);
558 usb_driver_release_interface(driver, ctx->control);
559 ctx->control = NULL;
560 }
561
562 usb_set_intfdata(intf, NULL);
563 cdc_ncm_free(ctx);
564 }
565 EXPORT_SYMBOL_GPL(cdc_ncm_unbind);
566
567 /* Select the MBIM altsetting iff it is preferred and available,
568 * returning the number of the corresponding data interface altsetting
569 */
570 u8 cdc_ncm_select_altsetting(struct usbnet *dev, struct usb_interface *intf)
571 {
572 struct usb_host_interface *alt;
573
574 /* The MBIM spec defines a NCM compatible default altsetting,
575 * which we may have matched:
576 *
577 * "Functions that implement both NCM 1.0 and MBIM (an
578 * “NCM/MBIM function”) according to this recommendation
579 * shall provide two alternate settings for the
580 * Communication Interface. Alternate setting 0, and the
581 * associated class and endpoint descriptors, shall be
582 * constructed according to the rules given for the
583 * Communication Interface in section 5 of [USBNCM10].
584 * Alternate setting 1, and the associated class and
585 * endpoint descriptors, shall be constructed according to
586 * the rules given in section 6 (USB Device Model) of this
587 * specification."
588 */
589 if (prefer_mbim && intf->num_altsetting == 2) {
590 alt = usb_altnum_to_altsetting(intf, CDC_NCM_COMM_ALTSETTING_MBIM);
591 if (alt && cdc_ncm_comm_intf_is_mbim(alt) &&
592 !usb_set_interface(dev->udev,
593 intf->cur_altsetting->desc.bInterfaceNumber,
594 CDC_NCM_COMM_ALTSETTING_MBIM))
595 return CDC_NCM_DATA_ALTSETTING_MBIM;
596 }
597 return CDC_NCM_DATA_ALTSETTING_NCM;
598 }
599 EXPORT_SYMBOL_GPL(cdc_ncm_select_altsetting);
600
601 static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
602 {
603 int ret;
604
605 /* MBIM backwards compatible function? */
606 cdc_ncm_select_altsetting(dev, intf);
607 if (cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting))
608 return -ENODEV;
609
610 /* NCM data altsetting is always 1 */
611 ret = cdc_ncm_bind_common(dev, intf, 1);
612
613 /*
614 * We should get an event when network connection is "connected" or
615 * "disconnected". Set network connection in "disconnected" state
616 * (carrier is OFF) during attach, so the IP network stack does not
617 * start IPv6 negotiation and more.
618 */
619 usbnet_link_change(dev, 0, 0);
620 return ret;
621 }
622
623 static void cdc_ncm_align_tail(struct sk_buff *skb, size_t modulus, size_t remainder, size_t max)
624 {
625 size_t align = ALIGN(skb->len, modulus) - skb->len + remainder;
626
627 if (skb->len + align > max)
628 align = max - skb->len;
629 if (align && skb_tailroom(skb) >= align)
630 memset(skb_put(skb, align), 0, align);
631 }
632
633 /* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly
634 * allocating a new one within skb
635 */
636 static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve)
637 {
638 struct usb_cdc_ncm_ndp16 *ndp16 = NULL;
639 struct usb_cdc_ncm_nth16 *nth16 = (void *)skb->data;
640 size_t ndpoffset = le16_to_cpu(nth16->wNdpIndex);
641
642 /* follow the chain of NDPs, looking for a match */
643 while (ndpoffset) {
644 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset);
645 if (ndp16->dwSignature == sign)
646 return ndp16;
647 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
648 }
649
650 /* align new NDP */
651 cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_max);
652
653 /* verify that there is room for the NDP and the datagram (reserve) */
654 if ((ctx->tx_max - skb->len - reserve) < CDC_NCM_NDP_SIZE)
655 return NULL;
656
657 /* link to it */
658 if (ndp16)
659 ndp16->wNextNdpIndex = cpu_to_le16(skb->len);
660 else
661 nth16->wNdpIndex = cpu_to_le16(skb->len);
662
663 /* push a new empty NDP */
664 ndp16 = (struct usb_cdc_ncm_ndp16 *)memset(skb_put(skb, CDC_NCM_NDP_SIZE), 0, CDC_NCM_NDP_SIZE);
665 ndp16->dwSignature = sign;
666 ndp16->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16) + sizeof(struct usb_cdc_ncm_dpe16));
667 return ndp16;
668 }
669
670 struct sk_buff *
671 cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign)
672 {
673 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
674 struct usb_cdc_ncm_nth16 *nth16;
675 struct usb_cdc_ncm_ndp16 *ndp16;
676 struct sk_buff *skb_out;
677 u16 n = 0, index, ndplen;
678 u8 ready2send = 0;
679
680 /* if there is a remaining skb, it gets priority */
681 if (skb != NULL) {
682 swap(skb, ctx->tx_rem_skb);
683 swap(sign, ctx->tx_rem_sign);
684 } else {
685 ready2send = 1;
686 }
687
688 /* check if we are resuming an OUT skb */
689 skb_out = ctx->tx_curr_skb;
690
691 /* allocate a new OUT skb */
692 if (!skb_out) {
693 skb_out = alloc_skb(ctx->tx_max, GFP_ATOMIC);
694 if (skb_out == NULL) {
695 if (skb != NULL) {
696 dev_kfree_skb_any(skb);
697 dev->net->stats.tx_dropped++;
698 }
699 goto exit_no_skb;
700 }
701 /* fill out the initial 16-bit NTB header */
702 nth16 = (struct usb_cdc_ncm_nth16 *)memset(skb_put(skb_out, sizeof(struct usb_cdc_ncm_nth16)), 0, sizeof(struct usb_cdc_ncm_nth16));
703 nth16->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
704 nth16->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16));
705 nth16->wSequence = cpu_to_le16(ctx->tx_seq++);
706
707 /* count total number of frames in this NTB */
708 ctx->tx_curr_frame_num = 0;
709 }
710
711 for (n = ctx->tx_curr_frame_num; n < ctx->tx_max_datagrams; n++) {
712 /* send any remaining skb first */
713 if (skb == NULL) {
714 skb = ctx->tx_rem_skb;
715 sign = ctx->tx_rem_sign;
716 ctx->tx_rem_skb = NULL;
717
718 /* check for end of skb */
719 if (skb == NULL)
720 break;
721 }
722
723 /* get the appropriate NDP for this skb */
724 ndp16 = cdc_ncm_ndp(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder);
725
726 /* align beginning of next frame */
727 cdc_ncm_align_tail(skb_out, ctx->tx_modulus, ctx->tx_remainder, ctx->tx_max);
728
729 /* check if we had enough room left for both NDP and frame */
730 if (!ndp16 || skb_out->len + skb->len > ctx->tx_max) {
731 if (n == 0) {
732 /* won't fit, MTU problem? */
733 dev_kfree_skb_any(skb);
734 skb = NULL;
735 dev->net->stats.tx_dropped++;
736 } else {
737 /* no room for skb - store for later */
738 if (ctx->tx_rem_skb != NULL) {
739 dev_kfree_skb_any(ctx->tx_rem_skb);
740 dev->net->stats.tx_dropped++;
741 }
742 ctx->tx_rem_skb = skb;
743 ctx->tx_rem_sign = sign;
744 skb = NULL;
745 ready2send = 1;
746 }
747 break;
748 }
749
750 /* calculate frame number withing this NDP */
751 ndplen = le16_to_cpu(ndp16->wLength);
752 index = (ndplen - sizeof(struct usb_cdc_ncm_ndp16)) / sizeof(struct usb_cdc_ncm_dpe16) - 1;
753
754 /* OK, add this skb */
755 ndp16->dpe16[index].wDatagramLength = cpu_to_le16(skb->len);
756 ndp16->dpe16[index].wDatagramIndex = cpu_to_le16(skb_out->len);
757 ndp16->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe16));
758 memcpy(skb_put(skb_out, skb->len), skb->data, skb->len);
759 dev_kfree_skb_any(skb);
760 skb = NULL;
761
762 /* send now if this NDP is full */
763 if (index >= CDC_NCM_DPT_DATAGRAMS_MAX) {
764 ready2send = 1;
765 break;
766 }
767 }
768
769 /* free up any dangling skb */
770 if (skb != NULL) {
771 dev_kfree_skb_any(skb);
772 skb = NULL;
773 dev->net->stats.tx_dropped++;
774 }
775
776 ctx->tx_curr_frame_num = n;
777
778 if (n == 0) {
779 /* wait for more frames */
780 /* push variables */
781 ctx->tx_curr_skb = skb_out;
782 goto exit_no_skb;
783
784 } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0)) {
785 /* wait for more frames */
786 /* push variables */
787 ctx->tx_curr_skb = skb_out;
788 /* set the pending count */
789 if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT)
790 ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT;
791 goto exit_no_skb;
792
793 } else {
794 /* frame goes out */
795 /* variables will be reset at next call */
796 }
797
798 /* If collected data size is less or equal CDC_NCM_MIN_TX_PKT
799 * bytes, we send buffers as it is. If we get more data, it
800 * would be more efficient for USB HS mobile device with DMA
801 * engine to receive a full size NTB, than canceling DMA
802 * transfer and receiving a short packet.
803 *
804 * This optimization support is pointless if we end up sending
805 * a ZLP after full sized NTBs.
806 */
807 if (!(dev->driver_info->flags & FLAG_SEND_ZLP) &&
808 skb_out->len > CDC_NCM_MIN_TX_PKT)
809 memset(skb_put(skb_out, ctx->tx_max - skb_out->len), 0,
810 ctx->tx_max - skb_out->len);
811 else if ((skb_out->len % dev->maxpacket) == 0)
812 *skb_put(skb_out, 1) = 0; /* force short packet */
813
814 /* set final frame length */
815 nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
816 nth16->wBlockLength = cpu_to_le16(skb_out->len);
817
818 /* return skb */
819 ctx->tx_curr_skb = NULL;
820 dev->net->stats.tx_packets += ctx->tx_curr_frame_num;
821 return skb_out;
822
823 exit_no_skb:
824 /* Start timer, if there is a remaining skb */
825 if (ctx->tx_curr_skb != NULL)
826 cdc_ncm_tx_timeout_start(ctx);
827 return NULL;
828 }
829 EXPORT_SYMBOL_GPL(cdc_ncm_fill_tx_frame);
830
831 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx)
832 {
833 /* start timer, if not already started */
834 if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop)))
835 hrtimer_start(&ctx->tx_timer,
836 ktime_set(0, CDC_NCM_TIMER_INTERVAL),
837 HRTIMER_MODE_REL);
838 }
839
840 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer)
841 {
842 struct cdc_ncm_ctx *ctx =
843 container_of(timer, struct cdc_ncm_ctx, tx_timer);
844
845 if (!atomic_read(&ctx->stop))
846 tasklet_schedule(&ctx->bh);
847 return HRTIMER_NORESTART;
848 }
849
850 static void cdc_ncm_txpath_bh(unsigned long param)
851 {
852 struct usbnet *dev = (struct usbnet *)param;
853 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
854
855 spin_lock_bh(&ctx->mtx);
856 if (ctx->tx_timer_pending != 0) {
857 ctx->tx_timer_pending--;
858 cdc_ncm_tx_timeout_start(ctx);
859 spin_unlock_bh(&ctx->mtx);
860 } else if (dev->net != NULL) {
861 spin_unlock_bh(&ctx->mtx);
862 netif_tx_lock_bh(dev->net);
863 usbnet_start_xmit(NULL, dev->net);
864 netif_tx_unlock_bh(dev->net);
865 } else {
866 spin_unlock_bh(&ctx->mtx);
867 }
868 }
869
870 static struct sk_buff *
871 cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
872 {
873 struct sk_buff *skb_out;
874 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
875
876 /*
877 * The Ethernet API we are using does not support transmitting
878 * multiple Ethernet frames in a single call. This driver will
879 * accumulate multiple Ethernet frames and send out a larger
880 * USB frame when the USB buffer is full or when a single jiffies
881 * timeout happens.
882 */
883 if (ctx == NULL)
884 goto error;
885
886 spin_lock_bh(&ctx->mtx);
887 skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN));
888 spin_unlock_bh(&ctx->mtx);
889 return skb_out;
890
891 error:
892 if (skb != NULL)
893 dev_kfree_skb_any(skb);
894
895 return NULL;
896 }
897
898 /* verify NTB header and return offset of first NDP, or negative error */
899 int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in)
900 {
901 struct usb_cdc_ncm_nth16 *nth16;
902 int len;
903 int ret = -EINVAL;
904
905 if (ctx == NULL)
906 goto error;
907
908 if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) +
909 sizeof(struct usb_cdc_ncm_ndp16))) {
910 pr_debug("frame too short\n");
911 goto error;
912 }
913
914 nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data;
915
916 if (le32_to_cpu(nth16->dwSignature) != USB_CDC_NCM_NTH16_SIGN) {
917 pr_debug("invalid NTH16 signature <%u>\n",
918 le32_to_cpu(nth16->dwSignature));
919 goto error;
920 }
921
922 len = le16_to_cpu(nth16->wBlockLength);
923 if (len > ctx->rx_max) {
924 pr_debug("unsupported NTB block length %u/%u\n", len,
925 ctx->rx_max);
926 goto error;
927 }
928
929 if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) &&
930 (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) &&
931 !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) {
932 pr_debug("sequence number glitch prev=%d curr=%d\n",
933 ctx->rx_seq, le16_to_cpu(nth16->wSequence));
934 }
935 ctx->rx_seq = le16_to_cpu(nth16->wSequence);
936
937 ret = le16_to_cpu(nth16->wNdpIndex);
938 error:
939 return ret;
940 }
941 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth16);
942
943 /* verify NDP header and return number of datagrams, or negative error */
944 int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset)
945 {
946 struct usb_cdc_ncm_ndp16 *ndp16;
947 int ret = -EINVAL;
948
949 if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) {
950 pr_debug("invalid NDP offset <%u>\n", ndpoffset);
951 goto error;
952 }
953 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
954
955 if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) {
956 pr_debug("invalid DPT16 length <%u>\n",
957 le32_to_cpu(ndp16->dwSignature));
958 goto error;
959 }
960
961 ret = ((le16_to_cpu(ndp16->wLength) -
962 sizeof(struct usb_cdc_ncm_ndp16)) /
963 sizeof(struct usb_cdc_ncm_dpe16));
964 ret--; /* we process NDP entries except for the last one */
965
966 if ((sizeof(struct usb_cdc_ncm_ndp16) + ret * (sizeof(struct usb_cdc_ncm_dpe16))) >
967 skb_in->len) {
968 pr_debug("Invalid nframes = %d\n", ret);
969 ret = -EINVAL;
970 }
971
972 error:
973 return ret;
974 }
975 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp16);
976
977 static int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
978 {
979 struct sk_buff *skb;
980 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
981 int len;
982 int nframes;
983 int x;
984 int offset;
985 struct usb_cdc_ncm_ndp16 *ndp16;
986 struct usb_cdc_ncm_dpe16 *dpe16;
987 int ndpoffset;
988 int loopcount = 50; /* arbitrary max preventing infinite loop */
989
990 ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in);
991 if (ndpoffset < 0)
992 goto error;
993
994 next_ndp:
995 nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset);
996 if (nframes < 0)
997 goto error;
998
999 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1000
1001 if (le32_to_cpu(ndp16->dwSignature) != USB_CDC_NCM_NDP16_NOCRC_SIGN) {
1002 pr_debug("invalid DPT16 signature <%u>\n",
1003 le32_to_cpu(ndp16->dwSignature));
1004 goto err_ndp;
1005 }
1006 dpe16 = ndp16->dpe16;
1007
1008 for (x = 0; x < nframes; x++, dpe16++) {
1009 offset = le16_to_cpu(dpe16->wDatagramIndex);
1010 len = le16_to_cpu(dpe16->wDatagramLength);
1011
1012 /*
1013 * CDC NCM ch. 3.7
1014 * All entries after first NULL entry are to be ignored
1015 */
1016 if ((offset == 0) || (len == 0)) {
1017 if (!x)
1018 goto err_ndp; /* empty NTB */
1019 break;
1020 }
1021
1022 /* sanity checking */
1023 if (((offset + len) > skb_in->len) ||
1024 (len > ctx->rx_max) || (len < ETH_HLEN)) {
1025 pr_debug("invalid frame detected (ignored)"
1026 "offset[%u]=%u, length=%u, skb=%p\n",
1027 x, offset, len, skb_in);
1028 if (!x)
1029 goto err_ndp;
1030 break;
1031
1032 } else {
1033 skb = skb_clone(skb_in, GFP_ATOMIC);
1034 if (!skb)
1035 goto error;
1036 skb->len = len;
1037 skb->data = ((u8 *)skb_in->data) + offset;
1038 skb_set_tail_pointer(skb, len);
1039 usbnet_skb_return(dev, skb);
1040 }
1041 }
1042 err_ndp:
1043 /* are there more NDPs to process? */
1044 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
1045 if (ndpoffset && loopcount--)
1046 goto next_ndp;
1047
1048 return 1;
1049 error:
1050 return 0;
1051 }
1052
1053 static void
1054 cdc_ncm_speed_change(struct usbnet *dev,
1055 struct usb_cdc_speed_change *data)
1056 {
1057 uint32_t rx_speed = le32_to_cpu(data->DLBitRRate);
1058 uint32_t tx_speed = le32_to_cpu(data->ULBitRate);
1059
1060 /*
1061 * Currently the USB-NET API does not support reporting the actual
1062 * device speed. Do print it instead.
1063 */
1064 if ((tx_speed > 1000000) && (rx_speed > 1000000)) {
1065 printk(KERN_INFO KBUILD_MODNAME
1066 ": %s: %u mbit/s downlink "
1067 "%u mbit/s uplink\n",
1068 dev->net->name,
1069 (unsigned int)(rx_speed / 1000000U),
1070 (unsigned int)(tx_speed / 1000000U));
1071 } else {
1072 printk(KERN_INFO KBUILD_MODNAME
1073 ": %s: %u kbit/s downlink "
1074 "%u kbit/s uplink\n",
1075 dev->net->name,
1076 (unsigned int)(rx_speed / 1000U),
1077 (unsigned int)(tx_speed / 1000U));
1078 }
1079 }
1080
1081 static void cdc_ncm_status(struct usbnet *dev, struct urb *urb)
1082 {
1083 struct cdc_ncm_ctx *ctx;
1084 struct usb_cdc_notification *event;
1085
1086 ctx = (struct cdc_ncm_ctx *)dev->data[0];
1087
1088 if (urb->actual_length < sizeof(*event))
1089 return;
1090
1091 /* test for split data in 8-byte chunks */
1092 if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
1093 cdc_ncm_speed_change(dev,
1094 (struct usb_cdc_speed_change *)urb->transfer_buffer);
1095 return;
1096 }
1097
1098 event = urb->transfer_buffer;
1099
1100 switch (event->bNotificationType) {
1101 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
1102 /*
1103 * According to the CDC NCM specification ch.7.1
1104 * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be
1105 * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE.
1106 */
1107 ctx->connected = le16_to_cpu(event->wValue);
1108
1109 printk(KERN_INFO KBUILD_MODNAME ": %s: network connection:"
1110 " %sconnected\n",
1111 dev->net->name, ctx->connected ? "" : "dis");
1112
1113 usbnet_link_change(dev, ctx->connected, 0);
1114 break;
1115
1116 case USB_CDC_NOTIFY_SPEED_CHANGE:
1117 if (urb->actual_length < (sizeof(*event) +
1118 sizeof(struct usb_cdc_speed_change)))
1119 set_bit(EVENT_STS_SPLIT, &dev->flags);
1120 else
1121 cdc_ncm_speed_change(dev,
1122 (struct usb_cdc_speed_change *)&event[1]);
1123 break;
1124
1125 default:
1126 dev_dbg(&dev->udev->dev,
1127 "NCM: unexpected notification 0x%02x!\n",
1128 event->bNotificationType);
1129 break;
1130 }
1131 }
1132
1133 static int cdc_ncm_check_connect(struct usbnet *dev)
1134 {
1135 struct cdc_ncm_ctx *ctx;
1136
1137 ctx = (struct cdc_ncm_ctx *)dev->data[0];
1138 if (ctx == NULL)
1139 return 1; /* disconnected */
1140
1141 return !ctx->connected;
1142 }
1143
1144 static int
1145 cdc_ncm_probe(struct usb_interface *udev, const struct usb_device_id *prod)
1146 {
1147 return usbnet_probe(udev, prod);
1148 }
1149
1150 static void cdc_ncm_disconnect(struct usb_interface *intf)
1151 {
1152 struct usbnet *dev = usb_get_intfdata(intf);
1153
1154 if (dev == NULL)
1155 return; /* already disconnected */
1156
1157 usbnet_disconnect(intf);
1158 }
1159
1160 static const struct driver_info cdc_ncm_info = {
1161 .description = "CDC NCM",
1162 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET,
1163 .bind = cdc_ncm_bind,
1164 .unbind = cdc_ncm_unbind,
1165 .check_connect = cdc_ncm_check_connect,
1166 .manage_power = usbnet_manage_power,
1167 .status = cdc_ncm_status,
1168 .rx_fixup = cdc_ncm_rx_fixup,
1169 .tx_fixup = cdc_ncm_tx_fixup,
1170 };
1171
1172 /* Same as cdc_ncm_info, but with FLAG_WWAN */
1173 static const struct driver_info wwan_info = {
1174 .description = "Mobile Broadband Network Device",
1175 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1176 | FLAG_WWAN,
1177 .bind = cdc_ncm_bind,
1178 .unbind = cdc_ncm_unbind,
1179 .check_connect = cdc_ncm_check_connect,
1180 .manage_power = usbnet_manage_power,
1181 .status = cdc_ncm_status,
1182 .rx_fixup = cdc_ncm_rx_fixup,
1183 .tx_fixup = cdc_ncm_tx_fixup,
1184 };
1185
1186 /* Same as wwan_info, but with FLAG_NOARP */
1187 static const struct driver_info wwan_noarp_info = {
1188 .description = "Mobile Broadband Network Device (NO ARP)",
1189 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1190 | FLAG_WWAN | FLAG_NOARP,
1191 .bind = cdc_ncm_bind,
1192 .unbind = cdc_ncm_unbind,
1193 .check_connect = cdc_ncm_check_connect,
1194 .manage_power = usbnet_manage_power,
1195 .status = cdc_ncm_status,
1196 .rx_fixup = cdc_ncm_rx_fixup,
1197 .tx_fixup = cdc_ncm_tx_fixup,
1198 };
1199
1200 static const struct usb_device_id cdc_devs[] = {
1201 /* Ericsson MBM devices like F5521gw */
1202 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1203 | USB_DEVICE_ID_MATCH_VENDOR,
1204 .idVendor = 0x0bdb,
1205 .bInterfaceClass = USB_CLASS_COMM,
1206 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1207 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1208 .driver_info = (unsigned long) &wwan_info,
1209 },
1210
1211 /* Dell branded MBM devices like DW5550 */
1212 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1213 | USB_DEVICE_ID_MATCH_VENDOR,
1214 .idVendor = 0x413c,
1215 .bInterfaceClass = USB_CLASS_COMM,
1216 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1217 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1218 .driver_info = (unsigned long) &wwan_info,
1219 },
1220
1221 /* Toshiba branded MBM devices */
1222 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1223 | USB_DEVICE_ID_MATCH_VENDOR,
1224 .idVendor = 0x0930,
1225 .bInterfaceClass = USB_CLASS_COMM,
1226 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1227 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1228 .driver_info = (unsigned long) &wwan_info,
1229 },
1230
1231 /* tag Huawei devices as wwan */
1232 { USB_VENDOR_AND_INTERFACE_INFO(0x12d1,
1233 USB_CLASS_COMM,
1234 USB_CDC_SUBCLASS_NCM,
1235 USB_CDC_PROTO_NONE),
1236 .driver_info = (unsigned long)&wwan_info,
1237 },
1238
1239 /* Huawei NCM devices disguised as vendor specific */
1240 { USB_VENDOR_AND_INTERFACE_INFO(0x12d1, 0xff, 0x02, 0x16),
1241 .driver_info = (unsigned long)&wwan_info,
1242 },
1243 { USB_VENDOR_AND_INTERFACE_INFO(0x12d1, 0xff, 0x02, 0x46),
1244 .driver_info = (unsigned long)&wwan_info,
1245 },
1246 { USB_VENDOR_AND_INTERFACE_INFO(0x12d1, 0xff, 0x02, 0x76),
1247 .driver_info = (unsigned long)&wwan_info,
1248 },
1249
1250 /* Infineon(now Intel) HSPA Modem platform */
1251 { USB_DEVICE_AND_INTERFACE_INFO(0x1519, 0x0443,
1252 USB_CLASS_COMM,
1253 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1254 .driver_info = (unsigned long)&wwan_noarp_info,
1255 },
1256
1257 /* Generic CDC-NCM devices */
1258 { USB_INTERFACE_INFO(USB_CLASS_COMM,
1259 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1260 .driver_info = (unsigned long)&cdc_ncm_info,
1261 },
1262 {
1263 },
1264 };
1265 MODULE_DEVICE_TABLE(usb, cdc_devs);
1266
1267 static struct usb_driver cdc_ncm_driver = {
1268 .name = "cdc_ncm",
1269 .id_table = cdc_devs,
1270 .probe = cdc_ncm_probe,
1271 .disconnect = cdc_ncm_disconnect,
1272 .suspend = usbnet_suspend,
1273 .resume = usbnet_resume,
1274 .reset_resume = usbnet_resume,
1275 .supports_autosuspend = 1,
1276 .disable_hub_initiated_lpm = 1,
1277 };
1278
1279 module_usb_driver(cdc_ncm_driver);
1280
1281 MODULE_AUTHOR("Hans Petter Selasky");
1282 MODULE_DESCRIPTION("USB CDC NCM host driver");
1283 MODULE_LICENSE("Dual BSD/GPL");
Linux kernel - Deliverables
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