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 };
  52
  53 static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target,
  54                                         struct netlink_callback *cb, int flags)
  55 {
  56         void *hdr;
  57
  58         hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
  59                                 &nfc_genl_family, flags, NFC_CMD_GET_TARGET);
  60         if (!hdr)
  61                 return -EMSGSIZE;
  62
  63         genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
  64
  65         NLA_PUT_U32(msg, NFC_ATTR_TARGET_INDEX, target->idx);
  66         NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS,
  67                                 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         if (target->nfcid1_len > 0)
  71                 NLA_PUT(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len,
  72                                 target->nfcid1);
  73
  74         return genlmsg_end(msg, hdr);
  75
  76 nla_put_failure:
  77         genlmsg_cancel(msg, hdr);
  78         return -EMSGSIZE;
  79 }
  80
  81 static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
  82 {
  83         struct nfc_dev *dev;
  84         int rc;
  85         u32 idx;
  86
  87         rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
  88                                                 nfc_genl_family.attrbuf,
  89                                                 nfc_genl_family.maxattr,
  90                                                 nfc_genl_policy);
  91         if (rc < 0)
  92                 return ERR_PTR(rc);
  93
  94         if (!nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX])
  95                 return ERR_PTR(-EINVAL);
  96
  97         idx = nla_get_u32(nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX]);
  98
  99         dev = nfc_get_device(idx);
 100         if (!dev)
 101                 return ERR_PTR(-ENODEV);
 102
 103         return dev;
 104 }
 105
 106 static int nfc_genl_dump_targets(struct sk_buff *skb,
 107                                 struct netlink_callback *cb)
 108 {
 109         int i = cb->args[0];
 110         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 111         int rc;
 112
 113         if (!dev) {
 114                 dev = __get_device_from_cb(cb);
 115                 if (IS_ERR(dev))
 116                         return PTR_ERR(dev);
 117
 118                 cb->args[1] = (long) dev;
 119         }
 120
 121         spin_lock_bh(&dev->targets_lock);
 122
 123         cb->seq = dev->targets_generation;
 124
 125         while (i < dev->n_targets) {
 126                 rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
 127                                                                 NLM_F_MULTI);
 128                 if (rc < 0)
 129                         break;
 130
 131                 i++;
 132         }
 133
 134         spin_unlock_bh(&dev->targets_lock);
 135
 136         cb->args[0] = i;
 137
 138         return skb->len;
 139 }
 140
 141 static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
 142 {
 143         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 144
 145         if (dev)
 146                 nfc_put_device(dev);
 147
 148         return 0;
 149 }
 150
 151 int nfc_genl_targets_found(struct nfc_dev *dev)
 152 {
 153         struct sk_buff *msg;
 154         void *hdr;
 155
 156         dev->genl_data.poll_req_pid = 0;
 157
 158         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
 159         if (!msg)
 160                 return -ENOMEM;
 161
 162         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 163                                 NFC_EVENT_TARGETS_FOUND);
 164         if (!hdr)
 165                 goto free_msg;
 166
 167         NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
 168
 169         genlmsg_end(msg, hdr);
 170
 171         return genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
 172
 173 nla_put_failure:
 174         genlmsg_cancel(msg, hdr);
 175 free_msg:
 176         nlmsg_free(msg);
 177         return -EMSGSIZE;
 178 }
 179
 180 int nfc_genl_device_added(struct nfc_dev *dev)
 181 {
 182         struct sk_buff *msg;
 183         void *hdr;
 184
 185         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 186         if (!msg)
 187                 return -ENOMEM;
 188
 189         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 190                                 NFC_EVENT_DEVICE_ADDED);
 191         if (!hdr)
 192                 goto free_msg;
 193
 194         NLA_PUT_STRING(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev));
 195         NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
 196         NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols);
 197
 198         genlmsg_end(msg, hdr);
 199
 200         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
 201
 202         return 0;
 203
 204 nla_put_failure:
 205         genlmsg_cancel(msg, hdr);
 206 free_msg:
 207         nlmsg_free(msg);
 208         return -EMSGSIZE;
 209 }
 210
 211 int nfc_genl_device_removed(struct nfc_dev *dev)
 212 {
 213         struct sk_buff *msg;
 214         void *hdr;
 215
 216         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 217         if (!msg)
 218                 return -ENOMEM;
 219
 220         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 221                                 NFC_EVENT_DEVICE_REMOVED);
 222         if (!hdr)
 223                 goto free_msg;
 224
 225         NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
 226
 227         genlmsg_end(msg, hdr);
 228
 229         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
 230
 231         return 0;
 232
 233 nla_put_failure:
 234         genlmsg_cancel(msg, hdr);
 235 free_msg:
 236         nlmsg_free(msg);
 237         return -EMSGSIZE;
 238 }
 239
 240 static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
 241                                                 u32 pid, u32 seq,
 242                                                 struct netlink_callback *cb,
 243                                                 int flags)
 244 {
 245         void *hdr;
 246
 247         hdr = genlmsg_put(msg, pid, seq, &nfc_genl_family, flags,
 248                                                         NFC_CMD_GET_DEVICE);
 249         if (!hdr)
 250                 return -EMSGSIZE;
 251
 252         if (cb)
 253                 genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
 254
 255         NLA_PUT_STRING(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev));
 256         NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
 257         NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols);
 258
 259         return genlmsg_end(msg, hdr);
 260
 261 nla_put_failure:
 262         genlmsg_cancel(msg, hdr);
 263         return -EMSGSIZE;
 264 }
 265
 266 static int nfc_genl_dump_devices(struct sk_buff *skb,
 267                                 struct netlink_callback *cb)
 268 {
 269         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
 270         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 271         bool first_call = false;
 272
 273         if (!iter) {
 274                 first_call = true;
 275                 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
 276                 if (!iter)
 277                         return -ENOMEM;
 278                 cb->args[0] = (long) iter;
 279         }
 280
 281         mutex_lock(&nfc_devlist_mutex);
 282
 283         cb->seq = nfc_devlist_generation;
 284
 285         if (first_call) {
 286                 nfc_device_iter_init(iter);
 287                 dev = nfc_device_iter_next(iter);
 288         }
 289
 290         while (dev) {
 291                 int rc;
 292
 293                 rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).pid,
 294                                                         cb->nlh->nlmsg_seq,
 295                                                         cb, NLM_F_MULTI);
 296                 if (rc < 0)
 297                         break;
 298
 299                 dev = nfc_device_iter_next(iter);
 300         }
 301
 302         mutex_unlock(&nfc_devlist_mutex);
 303
 304         cb->args[1] = (long) dev;
 305
 306         return skb->len;
 307 }
 308
 309 static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
 310 {
 311         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
 312
 313         nfc_device_iter_exit(iter);
 314         kfree(iter);
 315
 316         return 0;
 317 }
 318
 319 int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
 320                                                 u8 comm_mode, u8 rf_mode)
 321 {
 322         struct sk_buff *msg;
 323         void *hdr;
 324
 325         pr_debug("DEP link is up\n");
 326
 327         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
 328         if (!msg)
 329                 return -ENOMEM;
 330
 331         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 332                                 NFC_CMD_DEP_LINK_UP);
 333         if (!hdr)
 334                 goto free_msg;
 335
 336         NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
 337         if (rf_mode == NFC_RF_INITIATOR)
 338                 NLA_PUT_U32(msg, NFC_ATTR_TARGET_INDEX, target_idx);
 339         NLA_PUT_U8(msg, NFC_ATTR_COMM_MODE, comm_mode);
 340         NLA_PUT_U8(msg, NFC_ATTR_RF_MODE, rf_mode);
 341
 342         genlmsg_end(msg, hdr);
 343
 344         dev->dep_link_up = true;
 345
 346         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
 347
 348         return 0;
 349
 350 nla_put_failure:
 351         genlmsg_cancel(msg, hdr);
 352 free_msg:
 353         nlmsg_free(msg);
 354         return -EMSGSIZE;
 355 }
 356
 357 int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
 358 {
 359         struct sk_buff *msg;
 360         void *hdr;
 361
 362         pr_debug("DEP link is down\n");
 363
 364         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
 365         if (!msg)
 366                 return -ENOMEM;
 367
 368         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 369                                 NFC_CMD_DEP_LINK_DOWN);
 370         if (!hdr)
 371                 goto free_msg;
 372
 373         NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
 374
 375         genlmsg_end(msg, hdr);
 376
 377         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
 378
 379         return 0;
 380
 381 nla_put_failure:
 382         genlmsg_cancel(msg, hdr);
 383 free_msg:
 384         nlmsg_free(msg);
 385         return -EMSGSIZE;
 386 }
 387
 388 static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
 389 {
 390         struct sk_buff *msg;
 391         struct nfc_dev *dev;
 392         u32 idx;
 393         int rc = -ENOBUFS;
 394
 395         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 396                 return -EINVAL;
 397
 398         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 399
 400         dev = nfc_get_device(idx);
 401         if (!dev)
 402                 return -ENODEV;
 403
 404         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 405         if (!msg) {
 406                 rc = -ENOMEM;
 407                 goto out_putdev;
 408         }
 409
 410         rc = nfc_genl_send_device(msg, dev, info->snd_pid, info->snd_seq,
 411                                                                 NULL, 0);
 412         if (rc < 0)
 413                 goto out_free;
 414
 415         nfc_put_device(dev);
 416
 417         return genlmsg_reply(msg, info);
 418
 419 out_free:
 420         nlmsg_free(msg);
 421 out_putdev:
 422         nfc_put_device(dev);
 423         return rc;
 424 }
 425
 426 static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info)
 427 {
 428         struct nfc_dev *dev;
 429         int rc;
 430         u32 idx;
 431
 432         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 433                 return -EINVAL;
 434
 435         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 436
 437         dev = nfc_get_device(idx);
 438         if (!dev)
 439                 return -ENODEV;
 440
 441         rc = nfc_dev_up(dev);
 442
 443         nfc_put_device(dev);
 444         return rc;
 445 }
 446
 447 static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info)
 448 {
 449         struct nfc_dev *dev;
 450         int rc;
 451         u32 idx;
 452
 453         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 454                 return -EINVAL;
 455
 456         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 457
 458         dev = nfc_get_device(idx);
 459         if (!dev)
 460                 return -ENODEV;
 461
 462         rc = nfc_dev_down(dev);
 463
 464         nfc_put_device(dev);
 465         return rc;
 466 }
 467
 468 static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
 469 {
 470         struct nfc_dev *dev;
 471         int rc;
 472         u32 idx;
 473         u32 protocols;
 474
 475         pr_debug("Poll start\n");
 476
 477         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 478                 !info->attrs[NFC_ATTR_PROTOCOLS])
 479                 return -EINVAL;
 480
 481         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 482         protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
 483
 484         dev = nfc_get_device(idx);
 485         if (!dev)
 486                 return -ENODEV;
 487
 488         mutex_lock(&dev->genl_data.genl_data_mutex);
 489
 490         rc = nfc_start_poll(dev, protocols);
 491         if (!rc)
 492                 dev->genl_data.poll_req_pid = info->snd_pid;
 493
 494         mutex_unlock(&dev->genl_data.genl_data_mutex);
 495
 496         nfc_put_device(dev);
 497         return rc;
 498 }
 499
 500 static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
 501 {
 502         struct nfc_dev *dev;
 503         int rc;
 504         u32 idx;
 505
 506         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 507                 return -EINVAL;
 508
 509         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 510
 511         dev = nfc_get_device(idx);
 512         if (!dev)
 513                 return -ENODEV;
 514
 515         mutex_lock(&dev->genl_data.genl_data_mutex);
 516
 517         if (dev->genl_data.poll_req_pid != info->snd_pid) {
 518                 rc = -EBUSY;
 519                 goto out;
 520         }
 521
 522         rc = nfc_stop_poll(dev);
 523         dev->genl_data.poll_req_pid = 0;
 524
 525 out:
 526         mutex_unlock(&dev->genl_data.genl_data_mutex);
 527         nfc_put_device(dev);
 528         return rc;
 529 }
 530
 531 static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
 532 {
 533         struct nfc_dev *dev;
 534         int rc, tgt_idx;
 535         u32 idx;
 536         u8 comm, rf;
 537
 538         pr_debug("DEP link up\n");
 539
 540         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 541                         !info->attrs[NFC_ATTR_COMM_MODE] ||
 542                         !info->attrs[NFC_ATTR_RF_MODE])
 543                 return -EINVAL;
 544
 545         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 546         if (!info->attrs[NFC_ATTR_TARGET_INDEX])
 547                 tgt_idx = NFC_TARGET_IDX_ANY;
 548         else
 549                 tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
 550
 551         comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
 552         rf = nla_get_u8(info->attrs[NFC_ATTR_RF_MODE]);
 553
 554         if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
 555                 return -EINVAL;
 556
 557         if (rf != NFC_RF_INITIATOR && comm != NFC_RF_TARGET)
 558                 return -EINVAL;
 559
 560         dev = nfc_get_device(idx);
 561         if (!dev)
 562                 return -ENODEV;
 563
 564         rc = nfc_dep_link_up(dev, tgt_idx, comm, rf);
 565
 566         nfc_put_device(dev);
 567
 568         return rc;
 569 }
 570
 571 static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
 572 {
 573         struct nfc_dev *dev;
 574         int rc;
 575         u32 idx;
 576
 577         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 578                 return -EINVAL;
 579
 580         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 581
 582         dev = nfc_get_device(idx);
 583         if (!dev)
 584                 return -ENODEV;
 585
 586         rc = nfc_dep_link_down(dev);
 587
 588         nfc_put_device(dev);
 589         return rc;
 590 }
 591
 592 static struct genl_ops nfc_genl_ops[] = {
 593         {
 594                 .cmd = NFC_CMD_GET_DEVICE,
 595                 .doit = nfc_genl_get_device,
 596                 .dumpit = nfc_genl_dump_devices,
 597                 .done = nfc_genl_dump_devices_done,
 598                 .policy = nfc_genl_policy,
 599         },
 600         {
 601                 .cmd = NFC_CMD_DEV_UP,
 602                 .doit = nfc_genl_dev_up,
 603                 .policy = nfc_genl_policy,
 604         },
 605         {
 606                 .cmd = NFC_CMD_DEV_DOWN,
 607                 .doit = nfc_genl_dev_down,
 608                 .policy = nfc_genl_policy,
 609         },
 610         {
 611                 .cmd = NFC_CMD_START_POLL,
 612                 .doit = nfc_genl_start_poll,
 613                 .policy = nfc_genl_policy,
 614         },
 615         {
 616                 .cmd = NFC_CMD_STOP_POLL,
 617                 .doit = nfc_genl_stop_poll,
 618                 .policy = nfc_genl_policy,
 619         },
 620         {
 621                 .cmd = NFC_CMD_DEP_LINK_UP,
 622                 .doit = nfc_genl_dep_link_up,
 623                 .policy = nfc_genl_policy,
 624         },
 625         {
 626                 .cmd = NFC_CMD_DEP_LINK_DOWN,
 627                 .doit = nfc_genl_dep_link_down,
 628                 .policy = nfc_genl_policy,
 629         },
 630         {
 631                 .cmd = NFC_CMD_GET_TARGET,
 632                 .dumpit = nfc_genl_dump_targets,
 633                 .done = nfc_genl_dump_targets_done,
 634                 .policy = nfc_genl_policy,
 635         },
 636 };
 637
 638 static int nfc_genl_rcv_nl_event(struct notifier_block *this,
 639                                                 unsigned long event, void *ptr)
 640 {
 641         struct netlink_notify *n = ptr;
 642         struct class_dev_iter iter;
 643         struct nfc_dev *dev;
 644
 645         if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
 646                 goto out;
 647
 648         pr_debug("NETLINK_URELEASE event from id %d\n", n->pid);
 649
 650         nfc_device_iter_init(&iter);
 651         dev = nfc_device_iter_next(&iter);
 652
 653         while (dev) {
 654                 if (dev->genl_data.poll_req_pid == n->pid) {
 655                         nfc_stop_poll(dev);
 656                         dev->genl_data.poll_req_pid = 0;
 657                 }
 658                 dev = nfc_device_iter_next(&iter);
 659         }
 660
 661         nfc_device_iter_exit(&iter);
 662
 663 out:
 664         return NOTIFY_DONE;
 665 }
 666
 667 void nfc_genl_data_init(struct nfc_genl_data *genl_data)
 668 {
 669         genl_data->poll_req_pid = 0;
 670         mutex_init(&genl_data->genl_data_mutex);
 671 }
 672
 673 void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
 674 {
 675         mutex_destroy(&genl_data->genl_data_mutex);
 676 }
 677
 678 static struct notifier_block nl_notifier = {
 679         .notifier_call  = nfc_genl_rcv_nl_event,
 680 };
 681
 682 /**
 683  * nfc_genl_init() - Initialize netlink interface
 684  *
 685  * This initialization function registers the nfc netlink family.
 686  */
 687 int __init nfc_genl_init(void)
 688 {
 689         int rc;
 690
 691         rc = genl_register_family_with_ops(&nfc_genl_family, nfc_genl_ops,
 692                                         ARRAY_SIZE(nfc_genl_ops));
 693         if (rc)
 694                 return rc;
 695
 696         rc = genl_register_mc_group(&nfc_genl_family, &nfc_genl_event_mcgrp);
 697
 698         netlink_register_notifier(&nl_notifier);
 699
 700         return rc;
 701 }
 702
 703 /**
 704  * nfc_genl_exit() - Deinitialize netlink interface
 705  *
 706  * This exit function unregisters the nfc netlink family.
 707  */
 708 void nfc_genl_exit(void)
 709 {
 710         netlink_unregister_notifier(&nl_notifier);
 711         genl_unregister_family(&nfc_genl_family);
 712 }