1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2012 Smith Micro Software, Inc.
4 * Copyright (c) 2012 Bjørn Mork <bjorn@mork.no>
5 *
6 * This driver is based on and reuse most of cdc_ncm, which is
7 * Copyright (C) ST-Ericsson 2010-2012
8 */
9
10 #include <linux/module.h>
11 #include <linux/netdevice.h>
12 #include <linux/ethtool.h>
13 #include <linux/if_vlan.h>
14 #include <linux/ip.h>
15 #include <linux/mii.h>
16 #include <linux/usb.h>
17 #include <linux/usb/cdc.h>
18 #include <linux/usb/usbnet.h>
19 #include <linux/usb/cdc-wdm.h>
20 #include <linux/usb/cdc_ncm.h>
21 #include <net/ipv6.h>
22 #include <net/addrconf.h>
23 #include <net/ipv6_stubs.h>
24
25 /* alternative VLAN for IP session 0 if not untagged */
26 #define MBIM_IPS0_VID 4094
27
28 /* driver specific data - must match cdc_ncm usage */
29 struct cdc_mbim_state {
30 struct cdc_ncm_ctx *ctx;
31 atomic_t pmcount;
32 struct usb_driver *subdriver;
33 unsigned long _unused;
34 unsigned long flags;
35 };
36
37 /* flags for the cdc_mbim_state.flags field */
38 enum cdc_mbim_flags {
39 FLAG_IPS0_VLAN = 1 << 0, /* IP session 0 is tagged */
40 };
41
42 /* using a counter to merge subdriver requests with our own into a combined state */
cdc_mbim_manage_power(struct usbnet * dev,int on)43 static int cdc_mbim_manage_power(struct usbnet *dev, int on)
44 {
45 struct cdc_mbim_state *info = (void *)&dev->data;
46 int rv = 0;
47
48 dev_dbg(&dev->intf->dev, "%s() pmcount=%d, on=%d\n", __func__, atomic_read(&info->pmcount), on);
49
50 if ((on && atomic_add_return(1, &info->pmcount) == 1) || (!on && atomic_dec_and_test(&info->pmcount))) {
51 /* need autopm_get/put here to ensure the usbcore sees the new value */
52 rv = usb_autopm_get_interface(dev->intf);
53 dev->intf->needs_remote_wakeup = on;
54 if (!rv)
55 usb_autopm_put_interface(dev->intf);
56 }
57 return 0;
58 }
59
cdc_mbim_wdm_manage_power(struct usb_interface * intf,int status)60 static int cdc_mbim_wdm_manage_power(struct usb_interface *intf, int status)
61 {
62 struct usbnet *dev = usb_get_intfdata(intf);
63
64 /* can be called while disconnecting */
65 if (!dev)
66 return 0;
67
68 return cdc_mbim_manage_power(dev, status);
69 }
70
cdc_mbim_rx_add_vid(struct net_device * netdev,__be16 proto,u16 vid)71 static int cdc_mbim_rx_add_vid(struct net_device *netdev, __be16 proto, u16 vid)
72 {
73 struct usbnet *dev = netdev_priv(netdev);
74 struct cdc_mbim_state *info = (void *)&dev->data;
75
76 /* creation of this VLAN is a request to tag IP session 0 */
77 if (vid == MBIM_IPS0_VID)
78 info->flags |= FLAG_IPS0_VLAN;
79 else
80 if (vid >= 512) /* we don't map these to MBIM session */
81 return -EINVAL;
82 return 0;
83 }
84
cdc_mbim_rx_kill_vid(struct net_device * netdev,__be16 proto,u16 vid)85 static int cdc_mbim_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid)
86 {
87 struct usbnet *dev = netdev_priv(netdev);
88 struct cdc_mbim_state *info = (void *)&dev->data;
89
90 /* this is a request for an untagged IP session 0 */
91 if (vid == MBIM_IPS0_VID)
92 info->flags &= ~FLAG_IPS0_VLAN;
93 return 0;
94 }
95
96 static const struct net_device_ops cdc_mbim_netdev_ops = {
97 .ndo_open = usbnet_open,
98 .ndo_stop = usbnet_stop,
99 .ndo_start_xmit = usbnet_start_xmit,
100 .ndo_tx_timeout = usbnet_tx_timeout,
101 .ndo_get_stats64 = dev_get_tstats64,
102 .ndo_change_mtu = cdc_ncm_change_mtu,
103 .ndo_set_mac_address = eth_mac_addr,
104 .ndo_validate_addr = eth_validate_addr,
105 .ndo_vlan_rx_add_vid = cdc_mbim_rx_add_vid,
106 .ndo_vlan_rx_kill_vid = cdc_mbim_rx_kill_vid,
107 };
108
109 /* Change the control interface altsetting and update the .driver_info
110 * pointer if the matching entry after changing class codes points to
111 * a different struct
112 */
cdc_mbim_set_ctrlalt(struct usbnet * dev,struct usb_interface * intf,u8 alt)113 static int cdc_mbim_set_ctrlalt(struct usbnet *dev, struct usb_interface *intf, u8 alt)
114 {
115 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
116 const struct usb_device_id *id;
117 struct driver_info *info;
118 int ret;
119
120 ret = usb_set_interface(dev->udev,
121 intf->cur_altsetting->desc.bInterfaceNumber,
122 alt);
123 if (ret)
124 return ret;
125
126 id = usb_match_id(intf, driver->id_table);
127 if (!id)
128 return -ENODEV;
129
130 info = (struct driver_info *)id->driver_info;
131 if (info != dev->driver_info) {
132 dev_dbg(&intf->dev, "driver_info updated to '%s'\n",
133 info->description);
134 dev->driver_info = info;
135 }
136 return 0;
137 }
138
cdc_mbim_bind(struct usbnet * dev,struct usb_interface * intf)139 static int cdc_mbim_bind(struct usbnet *dev, struct usb_interface *intf)
140 {
141 struct cdc_ncm_ctx *ctx;
142 struct usb_driver *subdriver = ERR_PTR(-ENODEV);
143 int ret = -ENODEV;
144 u8 data_altsetting = 1;
145 struct cdc_mbim_state *info = (void *)&dev->data;
146
147 /* should we change control altsetting on a NCM/MBIM function? */
148 if (cdc_ncm_select_altsetting(intf) == CDC_NCM_COMM_ALTSETTING_MBIM) {
149 data_altsetting = CDC_NCM_DATA_ALTSETTING_MBIM;
150 ret = cdc_mbim_set_ctrlalt(dev, intf, CDC_NCM_COMM_ALTSETTING_MBIM);
151 if (ret)
152 goto err;
153 ret = -ENODEV;
154 }
155
156 /* we will hit this for NCM/MBIM functions if prefer_mbim is false */
157 if (!cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting))
158 goto err;
159
160 ret = cdc_ncm_bind_common(dev, intf, data_altsetting, dev->driver_info->data);
161 if (ret)
162 goto err;
163
164 ctx = info->ctx;
165
166 /* The MBIM descriptor and the status endpoint are required */
167 if (ctx->mbim_desc && dev->status)
168 subdriver = usb_cdc_wdm_register(ctx->control,
169 &dev->status->desc,
170 le16_to_cpu(ctx->mbim_desc->wMaxControlMessage),
171 WWAN_PORT_MBIM,
172 cdc_mbim_wdm_manage_power);
173 if (IS_ERR(subdriver)) {
174 ret = PTR_ERR(subdriver);
175 cdc_ncm_unbind(dev, intf);
176 goto err;
177 }
178
179 /* can't let usbnet use the interrupt endpoint */
180 dev->status = NULL;
181 info->subdriver = subdriver;
182
183 /* MBIM cannot do ARP */
184 dev->net->flags |= IFF_NOARP;
185
186 /* no need to put the VLAN tci in the packet headers */
187 dev->net->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_FILTER;
188
189 /* monitor VLAN additions and removals */
190 dev->net->netdev_ops = &cdc_mbim_netdev_ops;
191 err:
192 return ret;
193 }
194
cdc_mbim_unbind(struct usbnet * dev,struct usb_interface * intf)195 static void cdc_mbim_unbind(struct usbnet *dev, struct usb_interface *intf)
196 {
197 struct cdc_mbim_state *info = (void *)&dev->data;
198 struct cdc_ncm_ctx *ctx = info->ctx;
199
200 /* disconnect subdriver from control interface */
201 if (info->subdriver && info->subdriver->disconnect)
202 info->subdriver->disconnect(ctx->control);
203 info->subdriver = NULL;
204
205 /* let NCM unbind clean up both control and data interface */
206 cdc_ncm_unbind(dev, intf);
207 }
208
209 /* verify that the ethernet protocol is IPv4 or IPv6 */
is_ip_proto(__be16 proto)210 static bool is_ip_proto(__be16 proto)
211 {
212 switch (proto) {
213 case htons(ETH_P_IP):
214 case htons(ETH_P_IPV6):
215 return true;
216 }
217 return false;
218 }
219
cdc_mbim_tx_fixup(struct usbnet * dev,struct sk_buff * skb,gfp_t flags)220 static struct sk_buff *cdc_mbim_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
221 {
222 struct sk_buff *skb_out;
223 struct cdc_mbim_state *info = (void *)&dev->data;
224 struct cdc_ncm_ctx *ctx = info->ctx;
225 __le32 sign = cpu_to_le32(USB_CDC_MBIM_NDP16_IPS_SIGN);
226 u16 tci = 0;
227 bool is_ip;
228 u8 *c;
229
230 if (!ctx)
231 goto error;
232
233 if (skb) {
234 if (skb->len <= ETH_HLEN)
235 goto error;
236
237 /* Some applications using e.g. packet sockets will
238 * bypass the VLAN acceleration and create tagged
239 * ethernet frames directly. We primarily look for
240 * the accelerated out-of-band tag, but fall back if
241 * required
242 */
243 skb_reset_mac_header(skb);
244 if (vlan_get_tag(skb, &tci) < 0 && skb->len > VLAN_ETH_HLEN &&
245 __vlan_get_tag(skb, &tci) == 0) {
246 is_ip = is_ip_proto(vlan_eth_hdr(skb)->h_vlan_encapsulated_proto);
247 skb_pull(skb, VLAN_ETH_HLEN);
248 } else {
249 is_ip = is_ip_proto(eth_hdr(skb)->h_proto);
250 skb_pull(skb, ETH_HLEN);
251 }
252
253 /* Is IP session <0> tagged too? */
254 if (info->flags & FLAG_IPS0_VLAN) {
255 /* drop all untagged packets */
256 if (!tci)
257 goto error;
258 /* map MBIM_IPS0_VID to IPS<0> */
259 if (tci == MBIM_IPS0_VID)
260 tci = 0;
261 }
262
263 /* mapping VLANs to MBIM sessions:
264 * no tag => IPS session <0> if !FLAG_IPS0_VLAN
265 * 1 - 255 => IPS session <vlanid>
266 * 256 - 511 => DSS session <vlanid - 256>
267 * 512 - 4093 => unsupported, drop
268 * 4094 => IPS session <0> if FLAG_IPS0_VLAN
269 */
270
271 switch (tci & 0x0f00) {
272 case 0x0000: /* VLAN ID 0 - 255 */
273 if (!is_ip)
274 goto error;
275 c = (u8 *)&sign;
276 c[3] = tci;
277 break;
278 case 0x0100: /* VLAN ID 256 - 511 */
279 if (is_ip)
280 goto error;
281 sign = cpu_to_le32(USB_CDC_MBIM_NDP16_DSS_SIGN);
282 c = (u8 *)&sign;
283 c[3] = tci;
284 break;
285 default:
286 netif_err(dev, tx_err, dev->net,
287 "unsupported tci=0x%04x\n", tci);
288 goto error;
289 }
290 }
291
292 spin_lock_bh(&ctx->mtx);
293 skb_out = cdc_ncm_fill_tx_frame(dev, skb, sign);
294 spin_unlock_bh(&ctx->mtx);
295 return skb_out;
296
297 error:
298 if (skb)
299 dev_kfree_skb_any(skb);
300
301 return NULL;
302 }
303
304 /* Some devices are known to send Neighbor Solicitation messages and
305 * require Neighbor Advertisement replies. The IPv6 core will not
306 * respond since IFF_NOARP is set, so we must handle them ourselves.
307 */
do_neigh_solicit(struct usbnet * dev,u8 * buf,u16 tci)308 static void do_neigh_solicit(struct usbnet *dev, u8 *buf, u16 tci)
309 {
310 struct ipv6hdr *iph = (void *)buf;
311 struct nd_msg *msg = (void *)(iph + 1);
312 struct net_device *netdev;
313 struct inet6_dev *in6_dev;
314 bool is_router;
315
316 /* we'll only respond to requests from unicast addresses to
317 * our solicited node addresses.
318 */
319 if (!ipv6_addr_is_solict_mult(&iph->daddr) ||
320 !(ipv6_addr_type(&iph->saddr) & IPV6_ADDR_UNICAST))
321 return;
322
323 /* need to send the NA on the VLAN dev, if any */
324 rcu_read_lock();
325 if (tci) {
326 netdev = __vlan_find_dev_deep_rcu(dev->net, htons(ETH_P_8021Q),
327 tci);
328 if (!netdev) {
329 rcu_read_unlock();
330 return;
331 }
332 } else {
333 netdev = dev->net;
334 }
335 dev_hold(netdev);
336 rcu_read_unlock();
337
338 in6_dev = in6_dev_get(netdev);
339 if (!in6_dev)
340 goto out;
341 is_router = !!in6_dev->cnf.forwarding;
342 in6_dev_put(in6_dev);
343
344 /* ipv6_stub != NULL if in6_dev_get returned an inet6_dev */
345 ipv6_stub->ndisc_send_na(netdev, &iph->saddr, &msg->target,
346 is_router /* router */,
347 true /* solicited */,
348 false /* override */,
349 true /* inc_opt */);
350 out:
351 dev_put(netdev);
352 }
353
is_neigh_solicit(u8 * buf,size_t len)354 static bool is_neigh_solicit(u8 *buf, size_t len)
355 {
356 struct ipv6hdr *iph = (void *)buf;
357 struct nd_msg *msg = (void *)(iph + 1);
358
359 return (len >= sizeof(struct ipv6hdr) + sizeof(struct nd_msg) &&
360 iph->nexthdr == IPPROTO_ICMPV6 &&
361 msg->icmph.icmp6_code == 0 &&
362 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION);
363 }
364
365
cdc_mbim_process_dgram(struct usbnet * dev,u8 * buf,size_t len,u16 tci)366 static struct sk_buff *cdc_mbim_process_dgram(struct usbnet *dev, u8 *buf, size_t len, u16 tci)
367 {
368 __be16 proto = htons(ETH_P_802_3);
369 struct sk_buff *skb = NULL;
370
371 if (tci < 256 || tci == MBIM_IPS0_VID) { /* IPS session? */
372 if (len < sizeof(struct iphdr))
373 goto err;
374
375 switch (*buf & 0xf0) {
376 case 0x40:
377 proto = htons(ETH_P_IP);
378 break;
379 case 0x60:
380 if (is_neigh_solicit(buf, len))
381 do_neigh_solicit(dev, buf, tci);
382 proto = htons(ETH_P_IPV6);
383 break;
384 default:
385 goto err;
386 }
387 }
388
389 skb = netdev_alloc_skb_ip_align(dev->net, len + ETH_HLEN);
390 if (!skb)
391 goto err;
392
393 /* add an ethernet header */
394 skb_put(skb, ETH_HLEN);
395 skb_reset_mac_header(skb);
396 eth_hdr(skb)->h_proto = proto;
397 eth_zero_addr(eth_hdr(skb)->h_source);
398 memcpy(eth_hdr(skb)->h_dest, dev->net->dev_addr, ETH_ALEN);
399
400 /* add datagram */
401 skb_put_data(skb, buf, len);
402
403 /* map MBIM session to VLAN */
404 if (tci)
405 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), tci);
406 err:
407 return skb;
408 }
409
cdc_mbim_rx_fixup(struct usbnet * dev,struct sk_buff * skb_in)410 static int cdc_mbim_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
411 {
412 struct sk_buff *skb;
413 struct cdc_mbim_state *info = (void *)&dev->data;
414 struct cdc_ncm_ctx *ctx = info->ctx;
415 int len;
416 int nframes;
417 int x;
418 int offset;
419 struct usb_cdc_ncm_ndp16 *ndp16;
420 struct usb_cdc_ncm_dpe16 *dpe16;
421 int ndpoffset;
422 int loopcount = 50; /* arbitrary max preventing infinite loop */
423 u32 payload = 0;
424 u8 *c;
425 u16 tci;
426
427 ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in);
428 if (ndpoffset < 0)
429 goto error;
430
431 next_ndp:
432 nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset);
433 if (nframes < 0)
434 goto error;
435
436 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
437
438 switch (ndp16->dwSignature & cpu_to_le32(0x00ffffff)) {
439 case cpu_to_le32(USB_CDC_MBIM_NDP16_IPS_SIGN):
440 c = (u8 *)&ndp16->dwSignature;
441 tci = c[3];
442 /* tag IPS<0> packets too if MBIM_IPS0_VID exists */
443 if (!tci && info->flags & FLAG_IPS0_VLAN)
444 tci = MBIM_IPS0_VID;
445 break;
446 case cpu_to_le32(USB_CDC_MBIM_NDP16_DSS_SIGN):
447 c = (u8 *)&ndp16->dwSignature;
448 tci = c[3] + 256;
449 break;
450 default:
451 netif_dbg(dev, rx_err, dev->net,
452 "unsupported NDP signature <0x%08x>\n",
453 le32_to_cpu(ndp16->dwSignature));
454 goto err_ndp;
455
456 }
457
458 dpe16 = ndp16->dpe16;
459 for (x = 0; x < nframes; x++, dpe16++) {
460 offset = le16_to_cpu(dpe16->wDatagramIndex);
461 len = le16_to_cpu(dpe16->wDatagramLength);
462
463 /*
464 * CDC NCM ch. 3.7
465 * All entries after first NULL entry are to be ignored
466 */
467 if ((offset == 0) || (len == 0)) {
468 if (!x)
469 goto err_ndp; /* empty NTB */
470 break;
471 }
472
473 /* sanity checking */
474 if (((offset + len) > skb_in->len) || (len > ctx->rx_max)) {
475 netif_dbg(dev, rx_err, dev->net,
476 "invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n",
477 x, offset, len, skb_in);
478 if (!x)
479 goto err_ndp;
480 break;
481 } else {
482 skb = cdc_mbim_process_dgram(dev, skb_in->data + offset, len, tci);
483 if (!skb)
484 goto error;
485 usbnet_skb_return(dev, skb);
486 payload += len; /* count payload bytes in this NTB */
487 }
488 }
489 err_ndp:
490 /* are there more NDPs to process? */
491 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
492 if (ndpoffset && loopcount--)
493 goto next_ndp;
494
495 /* update stats */
496 ctx->rx_overhead += skb_in->len - payload;
497 ctx->rx_ntbs++;
498
499 return 1;
500 error:
501 return 0;
502 }
503
cdc_mbim_suspend(struct usb_interface * intf,pm_message_t message)504 static int cdc_mbim_suspend(struct usb_interface *intf, pm_message_t message)
505 {
506 int ret = -ENODEV;
507 struct usbnet *dev = usb_get_intfdata(intf);
508 struct cdc_mbim_state *info = (void *)&dev->data;
509 struct cdc_ncm_ctx *ctx = info->ctx;
510
511 if (!ctx)
512 goto error;
513
514 /*
515 * Both usbnet_suspend() and subdriver->suspend() MUST return 0
516 * in system sleep context, otherwise, the resume callback has
517 * to recover device from previous suspend failure.
518 */
519 ret = usbnet_suspend(intf, message);
520 if (ret < 0)
521 goto error;
522
523 if (intf == ctx->control && info->subdriver && info->subdriver->suspend)
524 ret = info->subdriver->suspend(intf, message);
525 if (ret < 0)
526 usbnet_resume(intf);
527
528 error:
529 return ret;
530 }
531
cdc_mbim_resume(struct usb_interface * intf)532 static int cdc_mbim_resume(struct usb_interface *intf)
533 {
534 int ret = 0;
535 struct usbnet *dev = usb_get_intfdata(intf);
536 struct cdc_mbim_state *info = (void *)&dev->data;
537 struct cdc_ncm_ctx *ctx = info->ctx;
538 bool callsub = (intf == ctx->control && info->subdriver && info->subdriver->resume);
539
540 if (callsub)
541 ret = info->subdriver->resume(intf);
542 if (ret < 0)
543 goto err;
544 ret = usbnet_resume(intf);
545 if (ret < 0 && callsub)
546 info->subdriver->suspend(intf, PMSG_SUSPEND);
547 err:
548 return ret;
549 }
550
551 static const struct driver_info cdc_mbim_info = {
552 .description = "CDC MBIM",
553 .flags = FLAG_NO_SETINT | FLAG_MULTI_PACKET | FLAG_WWAN,
554 .bind = cdc_mbim_bind,
555 .unbind = cdc_mbim_unbind,
556 .manage_power = cdc_mbim_manage_power,
557 .rx_fixup = cdc_mbim_rx_fixup,
558 .tx_fixup = cdc_mbim_tx_fixup,
559 };
560
561 /* MBIM and NCM devices should not need a ZLP after NTBs with
562 * dwNtbOutMaxSize length. Nevertheless, a number of devices from
563 * different vendor IDs will fail unless we send ZLPs, forcing us
564 * to make this the default.
565 *
566 * This default may cause a performance penalty for spec conforming
567 * devices wanting to take advantage of optimizations possible without
568 * ZLPs. A whitelist is added in an attempt to avoid this for devices
569 * known to conform to the MBIM specification.
570 *
571 * All known devices supporting NCM compatibility mode are also
572 * conforming to the NCM and MBIM specifications. For this reason, the
573 * NCM subclass entry is also in the ZLP whitelist.
574 */
575 static const struct driver_info cdc_mbim_info_zlp = {
576 .description = "CDC MBIM",
577 .flags = FLAG_NO_SETINT | FLAG_MULTI_PACKET | FLAG_WWAN | FLAG_SEND_ZLP,
578 .bind = cdc_mbim_bind,
579 .unbind = cdc_mbim_unbind,
580 .manage_power = cdc_mbim_manage_power,
581 .rx_fixup = cdc_mbim_rx_fixup,
582 .tx_fixup = cdc_mbim_tx_fixup,
583 };
584
585 /* The spefication explicitly allows NDPs to be placed anywhere in the
586 * frame, but some devices fail unless the NDP is placed after the IP
587 * packets. Using the CDC_NCM_FLAG_NDP_TO_END flags to force this
588 * behaviour.
589 *
590 * Note: The current implementation of this feature restricts each NTB
591 * to a single NDP, implying that multiplexed sessions cannot share an
592 * NTB. This might affect performance for multiplexed sessions.
593 */
594 static const struct driver_info cdc_mbim_info_ndp_to_end = {
595 .description = "CDC MBIM",
596 .flags = FLAG_NO_SETINT | FLAG_MULTI_PACKET | FLAG_WWAN,
597 .bind = cdc_mbim_bind,
598 .unbind = cdc_mbim_unbind,
599 .manage_power = cdc_mbim_manage_power,
600 .rx_fixup = cdc_mbim_rx_fixup,
601 .tx_fixup = cdc_mbim_tx_fixup,
602 .data = CDC_NCM_FLAG_NDP_TO_END,
603 };
604
605 /* Some modems (e.g. Telit LE922A6) do not work properly with altsetting
606 * toggle done in cdc_ncm_bind_common. CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE
607 * flag is used to avoid this procedure.
608 */
609 static const struct driver_info cdc_mbim_info_avoid_altsetting_toggle = {
610 .description = "CDC MBIM",
611 .flags = FLAG_NO_SETINT | FLAG_MULTI_PACKET | FLAG_WWAN | FLAG_SEND_ZLP,
612 .bind = cdc_mbim_bind,
613 .unbind = cdc_mbim_unbind,
614 .manage_power = cdc_mbim_manage_power,
615 .rx_fixup = cdc_mbim_rx_fixup,
616 .tx_fixup = cdc_mbim_tx_fixup,
617 .data = CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE,
618 };
619
620 static const struct usb_device_id mbim_devs[] = {
621 /* This duplicate NCM entry is intentional. MBIM devices can
622 * be disguised as NCM by default, and this is necessary to
623 * allow us to bind the correct driver_info to such devices.
624 *
625 * bind() will sort out this for us, selecting the correct
626 * entry and reject the other
627 */
628 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
629 .driver_info = (unsigned long)&cdc_mbim_info,
630 },
631 /* ZLP conformance whitelist: All Ericsson MBIM devices */
632 { USB_VENDOR_AND_INTERFACE_INFO(0x0bdb, USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
633 .driver_info = (unsigned long)&cdc_mbim_info,
634 },
635
636 /* Some Huawei devices, ME906s-158 (12d1:15c1) and E3372
637 * (12d1:157d), are known to fail unless the NDP is placed
638 * after the IP packets. Applying the quirk to all Huawei
639 * devices is broader than necessary, but harmless.
640 */
641 { USB_VENDOR_AND_INTERFACE_INFO(0x12d1, USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
642 .driver_info = (unsigned long)&cdc_mbim_info_ndp_to_end,
643 },
644
645 /* The HP lt4132 (03f0:a31d) is a rebranded Huawei ME906s-158,
646 * therefore it too requires the above "NDP to end" quirk.
647 */
648 { USB_DEVICE_AND_INTERFACE_INFO(0x03f0, 0xa31d, USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
649 .driver_info = (unsigned long)&cdc_mbim_info_ndp_to_end,
650 },
651
652 /* Telit LE922A6 in MBIM composition */
653 { USB_DEVICE_AND_INTERFACE_INFO(0x1bc7, 0x1041, USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
654 .driver_info = (unsigned long)&cdc_mbim_info_avoid_altsetting_toggle,
655 },
656
657 /* Telit LN920 */
658 { USB_DEVICE_AND_INTERFACE_INFO(0x1bc7, 0x1061, USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
659 .driver_info = (unsigned long)&cdc_mbim_info_avoid_altsetting_toggle,
660 },
661
662 /* Telit FN990 */
663 { USB_DEVICE_AND_INTERFACE_INFO(0x1bc7, 0x1071, USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
664 .driver_info = (unsigned long)&cdc_mbim_info_avoid_altsetting_toggle,
665 },
666
667 /* Telit FE990 */
668 { USB_DEVICE_AND_INTERFACE_INFO(0x1bc7, 0x1081, USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
669 .driver_info = (unsigned long)&cdc_mbim_info_avoid_altsetting_toggle,
670 },
671
672 /* default entry */
673 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
674 .driver_info = (unsigned long)&cdc_mbim_info_zlp,
675 },
676 {
677 },
678 };
679 MODULE_DEVICE_TABLE(usb, mbim_devs);
680
681 static struct usb_driver cdc_mbim_driver = {
682 .name = "cdc_mbim",
683 .id_table = mbim_devs,
684 .probe = usbnet_probe,
685 .disconnect = usbnet_disconnect,
686 .suspend = cdc_mbim_suspend,
687 .resume = cdc_mbim_resume,
688 .reset_resume = cdc_mbim_resume,
689 .supports_autosuspend = 1,
690 .disable_hub_initiated_lpm = 1,
691 };
692 module_usb_driver(cdc_mbim_driver);
693
694 MODULE_AUTHOR("Greg Suarez <gsuarez@smithmicro.com>");
695 MODULE_AUTHOR("Bjørn Mork <bjorn@mork.no>");
696 MODULE_DESCRIPTION("USB CDC MBIM host driver");
697 MODULE_LICENSE("GPL");
698