net/nfc/netlink.c

   1 /*
   2  * Copyright (C) 2011 Instituto Nokia de Tecnologia
   3  *
   4  * Authors:
   5  *    Lauro Ramos Venancio <lauro.venancio@openbossa.org>
   6  *    Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the
  20  * Free Software Foundation, Inc.,
  21  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  22  */
  23
  24 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
  25
  26 #include <net/genetlink.h>
  27 #include <linux/nfc.h>
  28 #include <linux/slab.h>
  29
  30 #include "nfc.h"
  31
  32 static struct genl_multicast_group nfc_genl_event_mcgrp = {
  33         .name = NFC_GENL_MCAST_EVENT_NAME,
  34 };
  35
  36 struct genl_family nfc_genl_family = {
  37         .id = GENL_ID_GENERATE,
  38         .hdrsize = 0,
  39         .name = NFC_GENL_NAME,
  40         .version = NFC_GENL_VERSION,
  41         .maxattr = NFC_ATTR_MAX,
  42 };
  43
  44 static const struct nla_policy nfc_genl_policy[NFC_ATTR_MAX + 1] = {
  45         [NFC_ATTR_DEVICE_INDEX] = { .type = NLA_U32 },
  46         [NFC_ATTR_DEVICE_NAME] = { .type = NLA_STRING,
  47                                 .len = NFC_DEVICE_NAME_MAXSIZE },
  48         [NFC_ATTR_PROTOCOLS] = { .type = NLA_U32 },
  49         [NFC_ATTR_COMM_MODE] = { .type = NLA_U8 },
  50         [NFC_ATTR_RF_MODE] = { .type = NLA_U8 },
  51         [NFC_ATTR_DEVICE_POWERED] = { .type = NLA_U8 },
  52 };
  53
  54 static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target,
  55                                 struct netlink_callback *cb, int flags)
  56 {
  57         void *hdr;
  58
  59         hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
  60                           &nfc_genl_family, flags, NFC_CMD_GET_TARGET);
  61         if (!hdr)
  62                 return -EMSGSIZE;
  63
  64         genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
  65
  66         if (nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target->idx) ||
  67             nla_put_u32(msg, NFC_ATTR_PROTOCOLS, target->supported_protocols) ||
  68             nla_put_u16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res) ||
  69             nla_put_u8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res))
  70                 goto nla_put_failure;
  71         if (target->nfcid1_len > 0 &&
  72             nla_put(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len,
  73                     target->nfcid1))
  74                 goto nla_put_failure;
  75         if (target->sensb_res_len > 0 &&
  76             nla_put(msg, NFC_ATTR_TARGET_SENSB_RES, target->sensb_res_len,
  77                     target->sensb_res))
  78                 goto nla_put_failure;
  79         if (target->sensf_res_len > 0 &&
  80             nla_put(msg, NFC_ATTR_TARGET_SENSF_RES, target->sensf_res_len,
  81                     target->sensf_res))
  82                 goto nla_put_failure;
  83
  84         return genlmsg_end(msg, hdr);
  85
  86 nla_put_failure:
  87         genlmsg_cancel(msg, hdr);
  88         return -EMSGSIZE;
  89 }
  90
  91 static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
  92 {
  93         struct nfc_dev *dev;
  94         int rc;
  95         u32 idx;
  96
  97         rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
  98                          nfc_genl_family.attrbuf,
  99                          nfc_genl_family.maxattr,
 100                          nfc_genl_policy);
 101         if (rc < 0)
 102                 return ERR_PTR(rc);
 103
 104         if (!nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX])
 105                 return ERR_PTR(-EINVAL);
 106
 107         idx = nla_get_u32(nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX]);
 108
 109         dev = nfc_get_device(idx);
 110         if (!dev)
 111                 return ERR_PTR(-ENODEV);
 112
 113         return dev;
 114 }
 115
 116 static int nfc_genl_dump_targets(struct sk_buff *skb,
 117                                  struct netlink_callback *cb)
 118 {
 119         int i = cb->args[0];
 120         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 121         int rc;
 122
 123         if (!dev) {
 124                 dev = __get_device_from_cb(cb);
 125                 if (IS_ERR(dev))
 126                         return PTR_ERR(dev);
 127
 128                 cb->args[1] = (long) dev;
 129         }
 130
 131         spin_lock_bh(&dev->targets_lock);
 132
 133         cb->seq = dev->targets_generation;
 134
 135         while (i < dev->n_targets) {
 136                 rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
 137                                           NLM_F_MULTI);
 138                 if (rc < 0)
 139                         break;
 140
 141                 i++;
 142         }
 143
 144         spin_unlock_bh(&dev->targets_lock);
 145
 146         cb->args[0] = i;
 147
 148         return skb->len;
 149 }
 150
 151 static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
 152 {
 153         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 154
 155         if (dev)
 156                 nfc_put_device(dev);
 157
 158         return 0;
 159 }
 160
 161 int nfc_genl_targets_found(struct nfc_dev *dev)
 162 {
 163         struct sk_buff *msg;
 164         void *hdr;
 165
 166         dev->genl_data.poll_req_pid = 0;
 167
 168         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
 169         if (!msg)
 170                 return -ENOMEM;
 171
 172         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 173                           NFC_EVENT_TARGETS_FOUND);
 174         if (!hdr)
 175                 goto free_msg;
 176
 177         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 178                 goto nla_put_failure;
 179
 180         genlmsg_end(msg, hdr);
 181
 182         return genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
 183
 184 nla_put_failure:
 185         genlmsg_cancel(msg, hdr);
 186 free_msg:
 187         nlmsg_free(msg);
 188         return -EMSGSIZE;
 189 }
 190
 191 int nfc_genl_target_lost(struct nfc_dev *dev, u32 target_idx)
 192 {
 193         struct sk_buff *msg;
 194         void *hdr;
 195
 196         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 197         if (!msg)
 198                 return -ENOMEM;
 199
 200         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 201                           NFC_EVENT_TARGET_LOST);
 202         if (!hdr)
 203                 goto free_msg;
 204
 205         if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
 206             nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
 207                 goto nla_put_failure;
 208
 209         genlmsg_end(msg, hdr);
 210
 211         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
 212
 213         return 0;
 214
 215 nla_put_failure:
 216         genlmsg_cancel(msg, hdr);
 217 free_msg:
 218         nlmsg_free(msg);
 219         return -EMSGSIZE;
 220 }
 221
 222 int nfc_genl_device_added(struct nfc_dev *dev)
 223 {
 224         struct sk_buff *msg;
 225         void *hdr;
 226
 227         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 228         if (!msg)
 229                 return -ENOMEM;
 230
 231         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 232                           NFC_EVENT_DEVICE_ADDED);
 233         if (!hdr)
 234                 goto free_msg;
 235
 236         if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
 237             nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
 238             nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) ||
 239             nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up))
 240                 goto nla_put_failure;
 241
 242         genlmsg_end(msg, hdr);
 243
 244         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
 245
 246         return 0;
 247
 248 nla_put_failure:
 249         genlmsg_cancel(msg, hdr);
 250 free_msg:
 251         nlmsg_free(msg);
 252         return -EMSGSIZE;
 253 }
 254
 255 int nfc_genl_device_removed(struct nfc_dev *dev)
 256 {
 257         struct sk_buff *msg;
 258         void *hdr;
 259
 260         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 261         if (!msg)
 262                 return -ENOMEM;
 263
 264         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 265                           NFC_EVENT_DEVICE_REMOVED);
 266         if (!hdr)
 267                 goto free_msg;
 268
 269         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 270                 goto nla_put_failure;
 271
 272         genlmsg_end(msg, hdr);
 273
 274         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
 275
 276         return 0;
 277
 278 nla_put_failure:
 279         genlmsg_cancel(msg, hdr);
 280 free_msg:
 281         nlmsg_free(msg);
 282         return -EMSGSIZE;
 283 }
 284
 285 static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
 286                                 u32 pid, u32 seq,
 287                                 struct netlink_callback *cb,
 288                                 int flags)
 289 {
 290         void *hdr;
 291
 292         hdr = genlmsg_put(msg, pid, seq, &nfc_genl_family, flags,
 293                           NFC_CMD_GET_DEVICE);
 294         if (!hdr)
 295                 return -EMSGSIZE;
 296
 297         if (cb)
 298                 genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
 299
 300         if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
 301             nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
 302             nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) ||
 303             nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up))
 304                 goto nla_put_failure;
 305
 306         return genlmsg_end(msg, hdr);
 307
 308 nla_put_failure:
 309         genlmsg_cancel(msg, hdr);
 310         return -EMSGSIZE;
 311 }
 312
 313 static int nfc_genl_dump_devices(struct sk_buff *skb,
 314                                  struct netlink_callback *cb)
 315 {
 316         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
 317         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 318         bool first_call = false;
 319
 320         if (!iter) {
 321                 first_call = true;
 322                 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
 323                 if (!iter)
 324                         return -ENOMEM;
 325                 cb->args[0] = (long) iter;
 326         }
 327
 328         mutex_lock(&nfc_devlist_mutex);
 329
 330         cb->seq = nfc_devlist_generation;
 331
 332         if (first_call) {
 333                 nfc_device_iter_init(iter);
 334                 dev = nfc_device_iter_next(iter);
 335         }
 336
 337         while (dev) {
 338                 int rc;
 339
 340                 rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).pid,
 341                                           cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
 342                 if (rc < 0)
 343                         break;
 344
 345                 dev = nfc_device_iter_next(iter);
 346         }
 347
 348         mutex_unlock(&nfc_devlist_mutex);
 349
 350         cb->args[1] = (long) dev;
 351
 352         return skb->len;
 353 }
 354
 355 static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
 356 {
 357         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
 358
 359         nfc_device_iter_exit(iter);
 360         kfree(iter);
 361
 362         return 0;
 363 }
 364
 365 int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
 366                                u8 comm_mode, u8 rf_mode)
 367 {
 368         struct sk_buff *msg;
 369         void *hdr;
 370
 371         pr_debug("DEP link is up\n");
 372
 373         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
 374         if (!msg)
 375                 return -ENOMEM;
 376
 377         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP);
 378         if (!hdr)
 379                 goto free_msg;
 380
 381         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 382                 goto nla_put_failure;
 383         if (rf_mode == NFC_RF_INITIATOR &&
 384             nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
 385                 goto nla_put_failure;
 386         if (nla_put_u8(msg, NFC_ATTR_COMM_MODE, comm_mode) ||
 387             nla_put_u8(msg, NFC_ATTR_RF_MODE, rf_mode))
 388                 goto nla_put_failure;
 389
 390         genlmsg_end(msg, hdr);
 391
 392         dev->dep_link_up = true;
 393
 394         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
 395
 396         return 0;
 397
 398 nla_put_failure:
 399         genlmsg_cancel(msg, hdr);
 400 free_msg:
 401         nlmsg_free(msg);
 402         return -EMSGSIZE;
 403 }
 404
 405 int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
 406 {
 407         struct sk_buff *msg;
 408         void *hdr;
 409
 410         pr_debug("DEP link is down\n");
 411
 412         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
 413         if (!msg)
 414                 return -ENOMEM;
 415
 416         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 417                           NFC_CMD_DEP_LINK_DOWN);
 418         if (!hdr)
 419                 goto free_msg;
 420
 421         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 422                 goto nla_put_failure;
 423
 424         genlmsg_end(msg, hdr);
 425
 426         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
 427
 428         return 0;
 429
 430 nla_put_failure:
 431         genlmsg_cancel(msg, hdr);
 432 free_msg:
 433         nlmsg_free(msg);
 434         return -EMSGSIZE;
 435 }
 436
 437 static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
 438 {
 439         struct sk_buff *msg;
 440         struct nfc_dev *dev;
 441         u32 idx;
 442         int rc = -ENOBUFS;
 443
 444         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 445                 return -EINVAL;
 446
 447         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 448
 449         dev = nfc_get_device(idx);
 450         if (!dev)
 451                 return -ENODEV;
 452
 453         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 454         if (!msg) {
 455                 rc = -ENOMEM;
 456                 goto out_putdev;
 457         }
 458
 459         rc = nfc_genl_send_device(msg, dev, info->snd_pid, info->snd_seq,
 460                                   NULL, 0);
 461         if (rc < 0)
 462                 goto out_free;
 463
 464         nfc_put_device(dev);
 465
 466         return genlmsg_reply(msg, info);
 467
 468 out_free:
 469         nlmsg_free(msg);
 470 out_putdev:
 471         nfc_put_device(dev);
 472         return rc;
 473 }
 474
 475 static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info)
 476 {
 477         struct nfc_dev *dev;
 478         int rc;
 479         u32 idx;
 480
 481         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 482                 return -EINVAL;
 483
 484         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 485
 486         dev = nfc_get_device(idx);
 487         if (!dev)
 488                 return -ENODEV;
 489
 490         rc = nfc_dev_up(dev);
 491
 492         nfc_put_device(dev);
 493         return rc;
 494 }
 495
 496 static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info)
 497 {
 498         struct nfc_dev *dev;
 499         int rc;
 500         u32 idx;
 501
 502         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 503                 return -EINVAL;
 504
 505         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 506
 507         dev = nfc_get_device(idx);
 508         if (!dev)
 509                 return -ENODEV;
 510
 511         rc = nfc_dev_down(dev);
 512
 513         nfc_put_device(dev);
 514         return rc;
 515 }
 516
 517 static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
 518 {
 519         struct nfc_dev *dev;
 520         int rc;
 521         u32 idx;
 522         u32 protocols;
 523
 524         pr_debug("Poll start\n");
 525
 526         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 527             !info->attrs[NFC_ATTR_PROTOCOLS])
 528                 return -EINVAL;
 529
 530         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 531         protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
 532
 533         dev = nfc_get_device(idx);
 534         if (!dev)
 535                 return -ENODEV;
 536
 537         mutex_lock(&dev->genl_data.genl_data_mutex);
 538
 539         rc = nfc_start_poll(dev, protocols);
 540         if (!rc)
 541                 dev->genl_data.poll_req_pid = info->snd_pid;
 542
 543         mutex_unlock(&dev->genl_data.genl_data_mutex);
 544
 545         nfc_put_device(dev);
 546         return rc;
 547 }
 548
 549 static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
 550 {
 551         struct nfc_dev *dev;
 552         int rc;
 553         u32 idx;
 554
 555         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 556                 return -EINVAL;
 557
 558         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 559
 560         dev = nfc_get_device(idx);
 561         if (!dev)
 562                 return -ENODEV;
 563
 564         mutex_lock(&dev->genl_data.genl_data_mutex);
 565
 566         if (dev->genl_data.poll_req_pid != info->snd_pid) {
 567                 rc = -EBUSY;
 568                 goto out;
 569         }
 570
 571         rc = nfc_stop_poll(dev);
 572         dev->genl_data.poll_req_pid = 0;
 573
 574 out:
 575         mutex_unlock(&dev->genl_data.genl_data_mutex);
 576         nfc_put_device(dev);
 577         return rc;
 578 }
 579
 580 static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
 581 {
 582         struct nfc_dev *dev;
 583         int rc, tgt_idx;
 584         u32 idx;
 585         u8 comm;
 586
 587         pr_debug("DEP link up\n");
 588
 589         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 590             !info->attrs[NFC_ATTR_COMM_MODE])
 591                 return -EINVAL;
 592
 593         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 594         if (!info->attrs[NFC_ATTR_TARGET_INDEX])
 595                 tgt_idx = NFC_TARGET_IDX_ANY;
 596         else
 597                 tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
 598
 599         comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
 600
 601         if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
 602                 return -EINVAL;
 603
 604         dev = nfc_get_device(idx);
 605         if (!dev)
 606                 return -ENODEV;
 607
 608         rc = nfc_dep_link_up(dev, tgt_idx, comm);
 609
 610         nfc_put_device(dev);
 611
 612         return rc;
 613 }
 614
 615 static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
 616 {
 617         struct nfc_dev *dev;
 618         int rc;
 619         u32 idx;
 620
 621         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 622                 return -EINVAL;
 623
 624         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 625
 626         dev = nfc_get_device(idx);
 627         if (!dev)
 628                 return -ENODEV;
 629
 630         rc = nfc_dep_link_down(dev);
 631
 632         nfc_put_device(dev);
 633         return rc;
 634 }
 635
 636 static struct genl_ops nfc_genl_ops[] = {
 637         {
 638                 .cmd = NFC_CMD_GET_DEVICE,
 639                 .doit = nfc_genl_get_device,
 640                 .dumpit = nfc_genl_dump_devices,
 641                 .done = nfc_genl_dump_devices_done,
 642                 .policy = nfc_genl_policy,
 643         },
 644         {
 645                 .cmd = NFC_CMD_DEV_UP,
 646                 .doit = nfc_genl_dev_up,
 647                 .policy = nfc_genl_policy,
 648         },
 649         {
 650                 .cmd = NFC_CMD_DEV_DOWN,
 651                 .doit = nfc_genl_dev_down,
 652                 .policy = nfc_genl_policy,
 653         },
 654         {
 655                 .cmd = NFC_CMD_START_POLL,
 656                 .doit = nfc_genl_start_poll,
 657                 .policy = nfc_genl_policy,
 658         },
 659         {
 660                 .cmd = NFC_CMD_STOP_POLL,
 661                 .doit = nfc_genl_stop_poll,
 662                 .policy = nfc_genl_policy,
 663         },
 664         {
 665                 .cmd = NFC_CMD_DEP_LINK_UP,
 666                 .doit = nfc_genl_dep_link_up,
 667                 .policy = nfc_genl_policy,
 668         },
 669         {
 670                 .cmd = NFC_CMD_DEP_LINK_DOWN,
 671                 .doit = nfc_genl_dep_link_down,
 672                 .policy = nfc_genl_policy,
 673         },
 674         {
 675                 .cmd = NFC_CMD_GET_TARGET,
 676                 .dumpit = nfc_genl_dump_targets,
 677                 .done = nfc_genl_dump_targets_done,
 678                 .policy = nfc_genl_policy,
 679         },
 680 };
 681
 682 static int nfc_genl_rcv_nl_event(struct notifier_block *this,
 683                                  unsigned long event, void *ptr)
 684 {
 685         struct netlink_notify *n = ptr;
 686         struct class_dev_iter iter;
 687         struct nfc_dev *dev;
 688
 689         if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
 690                 goto out;
 691
 692         pr_debug("NETLINK_URELEASE event from id %d\n", n->pid);
 693
 694         nfc_device_iter_init(&iter);
 695         dev = nfc_device_iter_next(&iter);
 696
 697         while (dev) {
 698                 if (dev->genl_data.poll_req_pid == n->pid) {
 699                         nfc_stop_poll(dev);
 700                         dev->genl_data.poll_req_pid = 0;
 701                 }
 702                 dev = nfc_device_iter_next(&iter);
 703         }
 704
 705         nfc_device_iter_exit(&iter);
 706
 707 out:
 708         return NOTIFY_DONE;
 709 }
 710
 711 void nfc_genl_data_init(struct nfc_genl_data *genl_data)
 712 {
 713         genl_data->poll_req_pid = 0;
 714         mutex_init(&genl_data->genl_data_mutex);
 715 }
 716
 717 void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
 718 {
 719         mutex_destroy(&genl_data->genl_data_mutex);
 720 }
 721
 722 static struct notifier_block nl_notifier = {
 723         .notifier_call  = nfc_genl_rcv_nl_event,
 724 };
 725
 726 /**
 727  * nfc_genl_init() - Initialize netlink interface
 728  *
 729  * This initialization function registers the nfc netlink family.
 730  */
 731 int __init nfc_genl_init(void)
 732 {
 733         int rc;
 734
 735         rc = genl_register_family_with_ops(&nfc_genl_family, nfc_genl_ops,
 736                                            ARRAY_SIZE(nfc_genl_ops));
 737         if (rc)
 738                 return rc;
 739
 740         rc = genl_register_mc_group(&nfc_genl_family, &nfc_genl_event_mcgrp);
 741
 742         netlink_register_notifier(&nl_notifier);
 743
 744         return rc;
 745 }
 746
 747 /**
 748  * nfc_genl_exit() - Deinitialize netlink interface
 749  *
 750  * This exit function unregisters the nfc netlink family.
 751  */
 752 void nfc_genl_exit(void)
 753 {
 754         netlink_unregister_notifier(&nl_notifier);
 755         genl_unregister_family(&nfc_genl_family);
 756 }