drivers/net/usb/cdc_mbim.c

   1 /*
   2  * Copyright (c) 2012  Smith Micro Software, Inc.
   3  * Copyright (c) 2012  Bjørn Mork <bjorn@mork.no>
   4  *
   5  * This driver is based on and reuse most of cdc_ncm, which is
   6  * Copyright (C) ST-Ericsson 2010-2012
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/ethtool.h>
  16 #include <linux/if_vlan.h>
  17 #include <linux/ip.h>
  18 #include <linux/mii.h>
  19 #include <linux/usb.h>
  20 #include <linux/usb/cdc.h>
  21 #include <linux/usb/usbnet.h>
  22 #include <linux/usb/cdc-wdm.h>
  23 #include <linux/usb/cdc_ncm.h>
  24 #include <net/ipv6.h>
  25 #include <net/addrconf.h>
  26
  27 /* alternative VLAN for IP session 0 if not untagged */
  28 #define MBIM_IPS0_VID   4094
  29
  30 /* driver specific data - must match cdc_ncm usage */
  31 struct cdc_mbim_state {
  32         struct cdc_ncm_ctx *ctx;
  33         atomic_t pmcount;
  34         struct usb_driver *subdriver;
  35         unsigned long _unused;
  36         unsigned long flags;
  37 };
  38
  39 /* flags for the cdc_mbim_state.flags field */
  40 enum cdc_mbim_flags {
  41         FLAG_IPS0_VLAN = 1 << 0,        /* IP session 0 is tagged  */
  42 };
  43
  44 /* using a counter to merge subdriver requests with our own into a combined state */
  45 static int cdc_mbim_manage_power(struct usbnet *dev, int on)
  46 {
  47         struct cdc_mbim_state *info = (void *)&dev->data;
  48         int rv = 0;
  49
  50         dev_dbg(&dev->intf->dev, "%s() pmcount=%d, on=%d\n", __func__, atomic_read(&info->pmcount), on);
  51
  52         if ((on && atomic_add_return(1, &info->pmcount) == 1) || (!on && atomic_dec_and_test(&info->pmcount))) {
  53                 /* need autopm_get/put here to ensure the usbcore sees the new value */
  54                 rv = usb_autopm_get_interface(dev->intf);
  55                 dev->intf->needs_remote_wakeup = on;
  56                 if (!rv)
  57                         usb_autopm_put_interface(dev->intf);
  58         }
  59         return 0;
  60 }
  61
  62 static int cdc_mbim_wdm_manage_power(struct usb_interface *intf, int status)
  63 {
  64         struct usbnet *dev = usb_get_intfdata(intf);
  65
  66         /* can be called while disconnecting */
  67         if (!dev)
  68                 return 0;
  69
  70         return cdc_mbim_manage_power(dev, status);
  71 }
  72
  73 static int cdc_mbim_rx_add_vid(struct net_device *netdev, __be16 proto, u16 vid)
  74 {
  75         struct usbnet *dev = netdev_priv(netdev);
  76         struct cdc_mbim_state *info = (void *)&dev->data;
  77
  78         /* creation of this VLAN is a request to tag IP session 0 */
  79         if (vid == MBIM_IPS0_VID)
  80                 info->flags |= FLAG_IPS0_VLAN;
  81         else
  82                 if (vid >= 512) /* we don't map these to MBIM session */
  83                         return -EINVAL;
  84         return 0;
  85 }
  86
  87 static int cdc_mbim_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid)
  88 {
  89         struct usbnet *dev = netdev_priv(netdev);
  90         struct cdc_mbim_state *info = (void *)&dev->data;
  91
  92         /* this is a request for an untagged IP session 0 */
  93         if (vid == MBIM_IPS0_VID)
  94                 info->flags &= ~FLAG_IPS0_VLAN;
  95         return 0;
  96 }
  97
  98 static const struct net_device_ops cdc_mbim_netdev_ops = {
  99         .ndo_open             = usbnet_open,
 100         .ndo_stop             = usbnet_stop,
 101         .ndo_start_xmit       = usbnet_start_xmit,
 102         .ndo_tx_timeout       = usbnet_tx_timeout,
 103         .ndo_change_mtu       = cdc_ncm_change_mtu,
 104         .ndo_set_mac_address  = eth_mac_addr,
 105         .ndo_validate_addr    = eth_validate_addr,
 106         .ndo_vlan_rx_add_vid  = cdc_mbim_rx_add_vid,
 107         .ndo_vlan_rx_kill_vid = cdc_mbim_rx_kill_vid,
 108 };
 109
 110 /* Change the control interface altsetting and update the .driver_info
 111  * pointer if the matching entry after changing class codes points to
 112  * a different struct
 113  */
 114 static int cdc_mbim_set_ctrlalt(struct usbnet *dev, struct usb_interface *intf, u8 alt)
 115 {
 116         struct usb_driver *driver = to_usb_driver(intf->dev.driver);
 117         const struct usb_device_id *id;
 118         struct driver_info *info;
 119         int ret;
 120
 121         ret = usb_set_interface(dev->udev,
 122                                 intf->cur_altsetting->desc.bInterfaceNumber,
 123                                 alt);
 124         if (ret)
 125                 return ret;
 126
 127         id = usb_match_id(intf, driver->id_table);
 128         if (!id)
 129                 return -ENODEV;
 130
 131         info = (struct driver_info *)id->driver_info;
 132         if (info != dev->driver_info) {
 133                 dev_dbg(&intf->dev, "driver_info updated to '%s'\n",
 134                         info->description);
 135                 dev->driver_info = info;
 136         }
 137         return 0;
 138 }
 139
 140 static int cdc_mbim_bind(struct usbnet *dev, struct usb_interface *intf)
 141 {
 142         struct cdc_ncm_ctx *ctx;
 143         struct usb_driver *subdriver = ERR_PTR(-ENODEV);
 144         int ret = -ENODEV;
 145         u8 data_altsetting = 1;
 146         struct cdc_mbim_state *info = (void *)&dev->data;
 147
 148         /* should we change control altsetting on a NCM/MBIM function? */
 149         if (cdc_ncm_select_altsetting(intf) == CDC_NCM_COMM_ALTSETTING_MBIM) {
 150                 data_altsetting = CDC_NCM_DATA_ALTSETTING_MBIM;
 151                 ret = cdc_mbim_set_ctrlalt(dev, intf, CDC_NCM_COMM_ALTSETTING_MBIM);
 152                 if (ret)
 153                         goto err;
 154                 ret = -ENODEV;
 155         }
 156
 157         /* we will hit this for NCM/MBIM functions if prefer_mbim is false */
 158         if (!cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting))
 159                 goto err;
 160
 161         ret = cdc_ncm_bind_common(dev, intf, data_altsetting, dev->driver_info->data);
 162         if (ret)
 163                 goto err;
 164
 165         ctx = info->ctx;
 166
 167         /* The MBIM descriptor and the status endpoint are required */
 168         if (ctx->mbim_desc && dev->status)
 169                 subdriver = usb_cdc_wdm_register(ctx->control,
 170                                                  &dev->status->desc,
 171                                                  le16_to_cpu(ctx->mbim_desc->wMaxControlMessage),
 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
 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 */
 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
 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 Neigbor Solicitation messages and
 305  * require Neigbor Advertisement replies.  The IPv6 core will not
 306  * respond since IFF_NOARP is set, so we must handle them ourselves.
 307  */
 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
 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
 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         memcpy(skb_put(skb, len), 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
 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
 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
 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 performace 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,
 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         /* Telit LE922A6 in MBIM composition */
 646         { USB_DEVICE_AND_INTERFACE_INFO(0x1bc7, 0x1041, USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
 647           .driver_info = (unsigned long)&cdc_mbim_info_avoid_altsetting_toggle,
 648         },
 649
 650         /* default entry */
 651         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
 652           .driver_info = (unsigned long)&cdc_mbim_info_zlp,
 653         },
 654         {
 655         },
 656 };
 657 MODULE_DEVICE_TABLE(usb, mbim_devs);
 658
 659 static struct usb_driver cdc_mbim_driver = {
 660         .name = "cdc_mbim",
 661         .id_table = mbim_devs,
 662         .probe = usbnet_probe,
 663         .disconnect = usbnet_disconnect,
 664         .suspend = cdc_mbim_suspend,
 665         .resume = cdc_mbim_resume,
 666         .reset_resume = cdc_mbim_resume,
 667         .supports_autosuspend = 1,
 668         .disable_hub_initiated_lpm = 1,
 669 };
 670 module_usb_driver(cdc_mbim_driver);
 671
 672 MODULE_AUTHOR("Greg Suarez <gsuarez@smithmicro.com>");
 673 MODULE_AUTHOR("Bjørn Mork <bjorn@mork.no>");
 674 MODULE_DESCRIPTION("USB CDC MBIM host driver");
 675 MODULE_LICENSE("GPL");