aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/usb/cdc_mbim.c
blob: 96a5028621c8b320c2d6feca5911f40cde10771e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
/*
 * Copyright (c) 2012  Smith Micro Software, Inc.
 * Copyright (c) 2012  Bjørn Mork <bjorn@mork.no>
 *
 * This driver is based on and reuse most of cdc_ncm, which is
 * Copyright (C) ST-Ericsson 2010-2012
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/ethtool.h>
#include <linux/if_vlan.h>
#include <linux/ip.h>
#include <linux/mii.h>
#include <linux/usb.h>
#include <linux/usb/cdc.h>
#include <linux/usb/usbnet.h>
#include <linux/usb/cdc-wdm.h>
#include <linux/usb/cdc_ncm.h>
#include <net/ipv6.h>
#include <net/addrconf.h>

/* alternative VLAN for IP session 0 if not untagged */
#define MBIM_IPS0_VID	4094

/* driver specific data - must match cdc_ncm usage */
struct cdc_mbim_state {
	struct cdc_ncm_ctx *ctx;
	atomic_t pmcount;
	struct usb_driver *subdriver;
	unsigned long _unused;
	unsigned long flags;
};

/* flags for the cdc_mbim_state.flags field */
enum cdc_mbim_flags {
	FLAG_IPS0_VLAN = 1 << 0,	/* IP session 0 is tagged  */
};

/* using a counter to merge subdriver requests with our own into a combined state */
static int cdc_mbim_manage_power(struct usbnet *dev, int on)
{
	struct cdc_mbim_state *info = (void *)&dev->data;
	int rv = 0;

	dev_dbg(&dev->intf->dev, "%s() pmcount=%d, on=%d\n", __func__, atomic_read(&info->pmcount), on);

	if ((on && atomic_add_return(1, &info->pmcount) == 1) || (!on && atomic_dec_and_test(&info->pmcount))) {
		/* need autopm_get/put here to ensure the usbcore sees the new value */
		rv = usb_autopm_get_interface(dev->intf);
		dev->intf->needs_remote_wakeup = on;
		if (!rv)
			usb_autopm_put_interface(dev->intf);
	}
	return 0;
}

static int cdc_mbim_wdm_manage_power(struct usb_interface *intf, int status)
{
	struct usbnet *dev = usb_get_intfdata(intf);

	/* can be called while disconnecting */
	if (!dev)
		return 0;

	return cdc_mbim_manage_power(dev, status);
}

static int cdc_mbim_rx_add_vid(struct net_device *netdev, __be16 proto, u16 vid)
{
	struct usbnet *dev = netdev_priv(netdev);
	struct cdc_mbim_state *info = (void *)&dev->data;

	/* creation of this VLAN is a request to tag IP session 0 */
	if (vid == MBIM_IPS0_VID)
		info->flags |= FLAG_IPS0_VLAN;
	else
		if (vid >= 512)	/* we don't map these to MBIM session */
			return -EINVAL;
	return 0;
}

static int cdc_mbim_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid)
{
	struct usbnet *dev = netdev_priv(netdev);
	struct cdc_mbim_state *info = (void *)&dev->data;

	/* this is a request for an untagged IP session 0 */
	if (vid == MBIM_IPS0_VID)
		info->flags &= ~FLAG_IPS0_VLAN;
	return 0;
}

static const struct net_device_ops cdc_mbim_netdev_ops = {
	.ndo_open             = usbnet_open,
	.ndo_stop             = usbnet_stop,
	.ndo_start_xmit       = usbnet_start_xmit,
	.ndo_tx_timeout       = usbnet_tx_timeout,
	.ndo_change_mtu       = cdc_ncm_change_mtu,
	.ndo_set_mac_address  = eth_mac_addr,
	.ndo_validate_addr    = eth_validate_addr,
	.ndo_vlan_rx_add_vid  = cdc_mbim_rx_add_vid,
	.ndo_vlan_rx_kill_vid = cdc_mbim_rx_kill_vid,
};

/* Change the control interface altsetting and update the .driver_info
 * pointer if the matching entry after changing class codes points to
 * a different struct
 */
static int cdc_mbim_set_ctrlalt(struct usbnet *dev, struct usb_interface *intf, u8 alt)
{
	struct usb_driver *driver = to_usb_driver(intf->dev.driver);
	const struct usb_device_id *id;
	struct driver_info *info;
	int ret;

	ret = usb_set_interface(dev->udev,
				intf->cur_altsetting->desc.bInterfaceNumber,
				alt);
	if (ret)
		return ret;

	id = usb_match_id(intf, driver->id_table);
	if (!id)
		return -ENODEV;

	info = (struct driver_info *)id->driver_info;
	if (info != dev->driver_info) {
		dev_dbg(&intf->dev, "driver_info updated to '%s'\n",
			info->description);
		dev->driver_info = info;
	}
	return 0;
}

static int cdc_mbim_bind(struct usbnet *dev, struct usb_interface *intf)
{
	struct cdc_ncm_ctx *ctx;
	struct usb_driver *subdriver = ERR_PTR(-ENODEV);
	int ret = -ENODEV;
	u8 data_altsetting = 1;
	struct cdc_mbim_state *info = (void *)&dev->data;

	/* should we change control altsetting on a NCM/MBIM function? */
	if (cdc_ncm_select_altsetting(intf) == CDC_NCM_COMM_ALTSETTING_MBIM) {
		data_altsetting = CDC_NCM_DATA_ALTSETTING_MBIM;
		ret = cdc_mbim_set_ctrlalt(dev, intf, CDC_NCM_COMM_ALTSETTING_MBIM);
		if (ret)
			goto err;
		ret = -ENODEV;
	}

	/* we will hit this for NCM/MBIM functions if prefer_mbim is false */
	if (!cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting))
		goto err;

	ret = cdc_ncm_bind_common(dev, intf, data_altsetting, dev->driver_info->data);
	if (ret)
		goto err;

	ctx = info->ctx;

	/* The MBIM descriptor and the status endpoint are required */
	if (ctx->mbim_desc && dev->status)
		subdriver = usb_cdc_wdm_register(ctx->control,
						 &dev->status->desc,
						 le16_to_cpu(ctx->mbim_desc->wMaxControlMessage),
						 cdc_mbim_wdm_manage_power);
	if (IS_ERR(subdriver)) {
		ret = PTR_ERR(subdriver);
		cdc_ncm_unbind(dev, intf);
		goto err;
	}

	/* can't let usbnet use the interrupt endpoint */
	dev->status = NULL;
	info->subdriver = subdriver;

	/* MBIM cannot do ARP */
	dev->net->flags |= IFF_NOARP;

	/* no need to put the VLAN tci in the packet headers */
	dev->net->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_FILTER;

	/* monitor VLAN additions and removals */
	dev->net->netdev_ops = &cdc_mbim_netdev_ops;
err:
	return ret;
}

static void cdc_mbim_unbind(struct usbnet *dev, struct usb_interface *intf)
{
	struct cdc_mbim_state *info = (void *)&dev->data;
	struct cdc_ncm_ctx *ctx = info->ctx;

	/* disconnect subdriver from control interface */
	if (info->subdriver && info->subdriver->disconnect)
		info->subdriver->disconnect(ctx->control);
	info->subdriver = NULL;

	/* let NCM unbind clean up both control and data interface */
	cdc_ncm_unbind(dev, intf);
}

/* verify that the ethernet protocol is IPv4 or IPv6 */
static bool is_ip_proto(__be16 proto)
{
	switch (proto) {
	case htons(ETH_P_IP):
	case htons(ETH_P_IPV6):
		return true;
	}
	return false;
}

static struct sk_buff *cdc_mbim_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
{
	struct sk_buff *skb_out;
	struct cdc_mbim_state *info = (void *)&dev->data;
	struct cdc_ncm_ctx *ctx = info->ctx;
	__le32 sign = cpu_to_le32(USB_CDC_MBIM_NDP16_IPS_SIGN);
	u16 tci = 0;
	bool is_ip;
	u8 *c;

	if (!ctx)
		goto error;

	if (skb) {
		if (skb->len <= ETH_HLEN)
			goto error;

		/* Some applications using e.g. packet sockets will
		 * bypass the VLAN acceleration and create tagged
		 * ethernet frames directly.  We primarily look for
		 * the accelerated out-of-band tag, but fall back if
		 * required
		 */
		skb_reset_mac_header(skb);
		if (vlan_get_tag(skb, &tci) < 0 && skb->len > VLAN_ETH_HLEN &&
		    __vlan_get_tag(skb, &tci) == 0) {
			is_ip = is_ip_proto(vlan_eth_hdr(skb)->h_vlan_encapsulated_proto);
			skb_pull(skb, VLAN_ETH_HLEN);
		} else {
			is_ip = is_ip_proto(eth_hdr(skb)->h_proto);
			skb_pull(skb, ETH_HLEN);
		}

		/* Is IP session <0> tagged too? */
		if (info->flags & FLAG_IPS0_VLAN) {
			/* drop all untagged packets */
			if (!tci)
				goto error;
			/* map MBIM_IPS0_VID to IPS<0> */
			if (tci == MBIM_IPS0_VID)
				tci = 0;
		}

		/* mapping VLANs to MBIM sessions:
		 *   no tag     => IPS session <0> if !FLAG_IPS0_VLAN
		 *   1 - 255    => IPS session <vlanid>
		 *   256 - 511  => DSS session <vlanid - 256>
		 *   512 - 4093 => unsupported, drop
		 *   4094       => IPS session <0> if FLAG_IPS0_VLAN
		 */

		switch (tci & 0x0f00) {
		case 0x0000: /* VLAN ID 0 - 255 */
			if (!is_ip)
				goto error;
			c = (u8 *)&sign;
			c[3] = tci;
			break;
		case 0x0100: /* VLAN ID 256 - 511 */
			if (is_ip)
				goto error;
			sign = cpu_to_le32(USB_CDC_MBIM_NDP16_DSS_SIGN);
			c = (u8 *)&sign;
			c[3] = tci;
			break;
		default:
			netif_err(dev, tx_err, dev->net,
				  "unsupported tci=0x%04x\n", tci);
			goto error;
		}
	}

	spin_lock_bh(&ctx->mtx);
	skb_out = cdc_ncm_fill_tx_frame(dev, skb, sign);
	spin_unlock_bh(&ctx->mtx);
	return skb_out;

error:
	if (skb)
		dev_kfree_skb_any(skb);

	return NULL;
}

/* Some devices are known to send Neigbor Solicitation messages and
 * require Neigbor Advertisement replies.  The IPv6 core will not
 * respond since IFF_NOARP is set, so we must handle them ourselves.
 */
static void do_neigh_solicit(struct usbnet *dev, u8 *buf, u16 tci)
{
	struct ipv6hdr *iph = (void *)buf;
	struct nd_msg *msg = (void *)(iph + 1);
	struct net_device *netdev;
	struct inet6_dev *in6_dev;
	bool is_router;

	/* we'll only respond to requests from unicast addresses to
	 * our solicited node addresses.
	 */
	if (!ipv6_addr_is_solict_mult(&iph->daddr) ||
	    !(ipv6_addr_type(&iph->saddr) & IPV6_ADDR_UNICAST))
		return;

	/* need to send the NA on the VLAN dev, if any */
	rcu_read_lock();
	if (tci) {
		netdev = __vlan_find_dev_deep_rcu(dev->net, htons(ETH_P_8021Q),
						  tci);
		if (!netdev) {
			rcu_read_unlock();
			return;
		}
	} else {
		netdev = dev->net;
	}
	dev_hold(netdev);
	rcu_read_unlock();

	in6_dev = in6_dev_get(netdev);
	if (!in6_dev)
		goto out;
	is_router = !!in6_dev->cnf.forwarding;
	in6_dev_put(in6_dev);

	/* ipv6_stub != NULL if in6_dev_get returned an inet6_dev */
	ipv6_stub->ndisc_send_na(netdev, &iph->saddr, &msg->target,
				 is_router /* router */,
				 true /* solicited */,
				 false /* override */,
				 true /* inc_opt */);
out:
	dev_put(netdev);
}

static bool is_neigh_solicit(u8 *buf, size_t len)
{
	struct ipv6hdr *iph = (void *)buf;
	struct nd_msg *msg = (void *)(iph + 1);

	return (len >= sizeof(struct ipv6hdr) + sizeof(struct nd_msg) &&
		iph->nexthdr == IPPROTO_ICMPV6 &&
		msg->icmph.icmp6_code == 0 &&
		msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION);
}


static struct sk_buff *cdc_mbim_process_dgram(struct usbnet *dev, u8 *buf, size_t len, u16 tci)
{
	__be16 proto = htons(ETH_P_802_3);
	struct sk_buff *skb = NULL;

	if (tci < 256 || tci == MBIM_IPS0_VID) { /* IPS session? */
		if (len < sizeof(struct iphdr))
			goto err;

		switch (*buf & 0xf0) {
		case 0x40:
			proto = htons(ETH_P_IP);
			break;
		case 0x60:
			if (is_neigh_solicit(buf, len))
				do_neigh_solicit(dev, buf, tci);
			proto = htons(ETH_P_IPV6);
			break;
		default:
			goto err;
		}
	}

	skb = netdev_alloc_skb_ip_align(dev->net,  len + ETH_HLEN);
	if (!skb)
		goto err;

	/* add an ethernet header */
	skb_put(skb, ETH_HLEN);
	skb_reset_mac_header(skb);
	eth_hdr(skb)->h_proto = proto;
	eth_zero_addr(eth_hdr(skb)->h_source);
	memcpy(eth_hdr(skb)->h_dest, dev->net->dev_addr, ETH_ALEN);

	/* add datagram */
	memcpy(skb_put(skb, len), buf, len);

	/* map MBIM session to VLAN */
	if (tci)
		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), tci);
err:
	return skb;
}

static int cdc_mbim_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
{
	struct sk_buff *skb;
	struct cdc_mbim_state *info = (void *)&dev->data;
	struct cdc_ncm_ctx *ctx = info->ctx;
	int len;
	int nframes;
	int x;
	int offset;
	struct usb_cdc_ncm_ndp16 *ndp16;
	struct usb_cdc_ncm_dpe16 *dpe16;
	int ndpoffset;
	int loopcount = 50; /* arbitrary max preventing infinite loop */
	u32 payload = 0;
	u8 *c;
	u16 tci;

	ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in);
	if (ndpoffset < 0)
		goto error;

next_ndp:
	nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset);
	if (nframes < 0)
		goto error;

	ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);

	switch (ndp16->dwSignature & cpu_to_le32(0x00ffffff)) {
	case cpu_to_le32(USB_CDC_MBIM_NDP16_IPS_SIGN):
		c = (u8 *)&ndp16->dwSignature;
		tci = c[3];
		/* tag IPS<0> packets too if MBIM_IPS0_VID exists */
		if (!tci && info->flags & FLAG_IPS0_VLAN)
			tci = MBIM_IPS0_VID;
		break;
	case cpu_to_le32(USB_CDC_MBIM_NDP16_DSS_SIGN):
		c = (u8 *)&ndp16->dwSignature;
		tci = c[3] + 256;
		break;
	default:
		netif_dbg(dev, rx_err, dev->net,
			  "unsupported NDP signature <0x%08x>\n",
			  le32_to_cpu(ndp16->dwSignature));
		goto err_ndp;

	}

	dpe16 = ndp16->dpe16;
	for (x = 0; x < nframes; x++, dpe16++) {
		offset = le16_to_cpu(dpe16->wDatagramIndex);
		len = le16_to_cpu(dpe16->wDatagramLength);

		/*
		 * CDC NCM ch. 3.7
		 * All entries after first NULL entry are to be ignored
		 */
		if ((offset == 0) || (len == 0)) {
			if (!x)
				goto err_ndp; /* empty NTB */
			break;
		}

		/* sanity checking */
		if (((offset + len) > skb_in->len) || (len > ctx->rx_max)) {
			netif_dbg(dev, rx_err, dev->net,
				  "invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n",
				  x, offset, len, skb_in);
			if (!x)
				goto err_ndp;
			break;
		} else {
			skb = cdc_mbim_process_dgram(dev, skb_in->data + offset, len, tci);
			if (!skb)
				goto error;
			usbnet_skb_return(dev, skb);
			payload += len;	/* count payload bytes in this NTB */
		}
	}
err_ndp:
	/* are there more NDPs to process? */
	ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
	if (ndpoffset && loopcount--)
		goto next_ndp;

	/* update stats */
	ctx->rx_overhead += skb_in->len - payload;
	ctx->rx_ntbs++;

	return 1;
error:
	return 0;
}

static int cdc_mbim_suspend(struct usb_interface *intf, pm_message_t message)
{
	int ret = -ENODEV;
	struct usbnet *dev = usb_get_intfdata(intf);
	struct cdc_mbim_state *info = (void *)&dev->data;
	struct cdc_ncm_ctx *ctx = info->ctx;

	if (!ctx)
		goto error;

	/*
	 * Both usbnet_suspend() and subdriver->suspend() MUST return 0
	 * in system sleep context, otherwise, the resume callback has
	 * to recover device from previous suspend failure.
	 */
	ret = usbnet_suspend(intf, message);
	if (ret < 0)
		goto error;

	if (intf == ctx->control && info->subdriver && info->subdriver->suspend)
		ret = info->subdriver->suspend(intf, message);
	if (ret < 0)
		usbnet_resume(intf);

error:
	return ret;
}

static int cdc_mbim_resume(struct usb_interface *intf)
{
	int  ret = 0;
	struct usbnet *dev = usb_get_intfdata(intf);
	struct cdc_mbim_state *info = (void *)&dev->data;
	struct cdc_ncm_ctx *ctx = info->ctx;
	bool callsub = (intf == ctx->control && info->subdriver && info->subdriver->resume);

	if (callsub)
		ret = info->subdriver->resume(intf);
	if (ret < 0)
		goto err;
	ret = usbnet_resume(intf);
	if (ret < 0 && callsub)
		info->subdriver->suspend(intf, PMSG_SUSPEND);
err:
	return ret;
}

static const struct driver_info cdc_mbim_info = {
	.description = "CDC MBIM",
	.flags = FLAG_NO_SETINT | FLAG_MULTI_PACKET | FLAG_WWAN,
	.bind = cdc_mbim_bind,
	.unbind = cdc_mbim_unbind,
	.manage_power = cdc_mbim_manage_power,
	.rx_fixup = cdc_mbim_rx_fixup,
	.tx_fixup = cdc_mbim_tx_fixup,
};

/* MBIM and NCM devices should not need a ZLP after NTBs with
 * dwNtbOutMaxSize length. Nevertheless, a number of devices from
 * different vendor IDs will fail unless we send ZLPs, forcing us
 * to make this the default.
 *
 * This default may cause a performance penalty for spec conforming
 * devices wanting to take advantage of optimizations possible without
 * ZLPs.  A whitelist is added in an attempt to avoid this for devices
 * known to conform to the MBIM specification.
 *
 * All known devices supporting NCM compatibility mode are also
 * conforming to the NCM and MBIM specifications. For this reason, the
 * NCM subclass entry is also in the ZLP whitelist.
 */
static const struct driver_info cdc_mbim_info_zlp = {
	.description = "CDC MBIM",
	.flags = FLAG_NO_SETINT | FLAG_MULTI_PACKET | FLAG_WWAN | FLAG_SEND_ZLP,
	.bind = cdc_mbim_bind,
	.unbind = cdc_mbim_unbind,
	.manage_power = cdc_mbim_manage_power,
	.rx_fixup = cdc_mbim_rx_fixup,
	.tx_fixup = cdc_mbim_tx_fixup,
};

/* The spefication explicitly allows NDPs to be placed anywhere in the
 * frame, but some devices fail unless the NDP is placed after the IP
 * packets.  Using the CDC_NCM_FLAG_NDP_TO_END flags to force this
 * behaviour.
 *
 * Note: The current implementation of this feature restricts each NTB
 * to a single NDP, implying that multiplexed sessions cannot share an
 * NTB. This might affect performace for multiplexed sessions.
 */
static const struct driver_info cdc_mbim_info_ndp_to_end = {
	.description = "CDC MBIM",
	.flags = FLAG_NO_SETINT | FLAG_MULTI_PACKET | FLAG_WWAN,
	.bind = cdc_mbim_bind,
	.unbind = cdc_mbim_unbind,
	.manage_power = cdc_mbim_manage_power,
	.rx_fixup = cdc_mbim_rx_fixup,
	.tx_fixup = cdc_mbim_tx_fixup,
	.data = CDC_NCM_FLAG_NDP_TO_END,
};

static const struct usb_device_id mbim_devs[] = {
	/* This duplicate NCM entry is intentional. MBIM devices can
	 * be disguised as NCM by default, and this is necessary to
	 * allow us to bind the correct driver_info to such devices.
	 *
	 * bind() will sort out this for us, selecting the correct
	 * entry and reject the other
	 */
	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
	  .driver_info = (unsigned long)&cdc_mbim_info,
	},
	/* ZLP conformance whitelist: All Ericsson MBIM devices */
	{ USB_VENDOR_AND_INTERFACE_INFO(0x0bdb, USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
	  .driver_info = (unsigned long)&cdc_mbim_info,
	},

	/* Some Huawei devices, ME906s-158 (12d1:15c1) and E3372
	 * (12d1:157d), are known to fail unless the NDP is placed
	 * after the IP packets.  Applying the quirk to all Huawei
	 * devices is broader than necessary, but harmless.
	 */
	{ USB_VENDOR_AND_INTERFACE_INFO(0x12d1, USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
	  .driver_info = (unsigned long)&cdc_mbim_info_ndp_to_end,
	},
	/* default entry */
	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
	  .driver_info = (unsigned long)&cdc_mbim_info_zlp,
	},
	{
	},
};
MODULE_DEVICE_TABLE(usb, mbim_devs);

static struct usb_driver cdc_mbim_driver = {
	.name = "cdc_mbim",
	.id_table = mbim_devs,
	.probe = usbnet_probe,
	.disconnect = usbnet_disconnect,
	.suspend = cdc_mbim_suspend,
	.resume = cdc_mbim_resume,
	.reset_resume =	cdc_mbim_resume,
	.supports_autosuspend = 1,
	.disable_hub_initiated_lpm = 1,
};
module_usb_driver(cdc_mbim_driver);

MODULE_AUTHOR("Greg Suarez <gsuarez@smithmicro.com>");
MODULE_AUTHOR("Bjørn Mork <bjorn@mork.no>");
MODULE_DESCRIPTION("USB CDC MBIM host driver");
MODULE_LICENSE("GPL");