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         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         if (target->nfcid1_len > 0)
  71                 NLA_PUT(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len,
  72                         target->nfcid1);
  73         if (target->sensb_res_len > 0)
  74                 NLA_PUT(msg, NFC_ATTR_TARGET_SENSB_RES, target->sensb_res_len,
  75                         target->sensb_res);
  76         if (target->sensf_res_len > 0)
  77                 NLA_PUT(msg, NFC_ATTR_TARGET_SENSF_RES, target->sensf_res_len,
  78                         target->sensf_res);
  79
  80         return genlmsg_end(msg, hdr);
  81
  82 nla_put_failure:
  83         genlmsg_cancel(msg, hdr);
  84         return -EMSGSIZE;
  85 }
  86
  87 static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
  88 {
  89         struct nfc_dev *dev;
  90         int rc;
  91         u32 idx;
  92
  93         rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
  94                          nfc_genl_family.attrbuf,
  95                          nfc_genl_family.maxattr,
  96                          nfc_genl_policy);
  97         if (rc < 0)
  98                 return ERR_PTR(rc);
  99
 100         if (!nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX])
 101                 return ERR_PTR(-EINVAL);
 102
 103         idx = nla_get_u32(nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX]);
 104
 105         dev = nfc_get_device(idx);
 106         if (!dev)
 107                 return ERR_PTR(-ENODEV);
 108
 109         return dev;
 110 }
 111
 112 static int nfc_genl_dump_targets(struct sk_buff *skb,
 113                                  struct netlink_callback *cb)
 114 {
 115         int i = cb->args[0];
 116         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 117         int rc;
 118
 119         if (!dev) {
 120                 dev = __get_device_from_cb(cb);
 121                 if (IS_ERR(dev))
 122                         return PTR_ERR(dev);
 123
 124                 cb->args[1] = (long) dev;
 125         }
 126
 127         spin_lock_bh(&dev->targets_lock);
 128
 129         cb->seq = dev->targets_generation;
 130
 131         while (i < dev->n_targets) {
 132                 rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
 133                                           NLM_F_MULTI);
 134                 if (rc < 0)
 135                         break;
 136
 137                 i++;
 138         }
 139
 140         spin_unlock_bh(&dev->targets_lock);
 141
 142         cb->args[0] = i;
 143
 144         return skb->len;
 145 }
 146
 147 static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
 148 {
 149         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 150
 151         if (dev)
 152                 nfc_put_device(dev);
 153
 154         return 0;
 155 }
 156
 157 int nfc_genl_targets_found(struct nfc_dev *dev)
 158 {
 159         struct sk_buff *msg;
 160         void *hdr;
 161
 162         dev->genl_data.poll_req_pid = 0;
 163
 164         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
 165         if (!msg)
 166                 return -ENOMEM;
 167
 168         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 169                           NFC_EVENT_TARGETS_FOUND);
 170         if (!hdr)
 171                 goto free_msg;
 172
 173         NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
 174
 175         genlmsg_end(msg, hdr);
 176
 177         return genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
 178
 179 nla_put_failure:
 180         genlmsg_cancel(msg, hdr);
 181 free_msg:
 182         nlmsg_free(msg);
 183         return -EMSGSIZE;
 184 }
 185
 186 int nfc_genl_device_added(struct nfc_dev *dev)
 187 {
 188         struct sk_buff *msg;
 189         void *hdr;
 190
 191         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 192         if (!msg)
 193                 return -ENOMEM;
 194
 195         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 196                           NFC_EVENT_DEVICE_ADDED);
 197         if (!hdr)
 198                 goto free_msg;
 199
 200         NLA_PUT_STRING(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev));
 201         NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
 202         NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols);
 203         NLA_PUT_U8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up);
 204
 205         genlmsg_end(msg, hdr);
 206
 207         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
 208
 209         return 0;
 210
 211 nla_put_failure:
 212         genlmsg_cancel(msg, hdr);
 213 free_msg:
 214         nlmsg_free(msg);
 215         return -EMSGSIZE;
 216 }
 217
 218 int nfc_genl_device_removed(struct nfc_dev *dev)
 219 {
 220         struct sk_buff *msg;
 221         void *hdr;
 222
 223         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 224         if (!msg)
 225                 return -ENOMEM;
 226
 227         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 228                           NFC_EVENT_DEVICE_REMOVED);
 229         if (!hdr)
 230                 goto free_msg;
 231
 232         NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
 233
 234         genlmsg_end(msg, hdr);
 235
 236         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
 237
 238         return 0;
 239
 240 nla_put_failure:
 241         genlmsg_cancel(msg, hdr);
 242 free_msg:
 243         nlmsg_free(msg);
 244         return -EMSGSIZE;
 245 }
 246
 247 static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
 248                                 u32 pid, u32 seq,
 249                                 struct netlink_callback *cb,
 250                                 int flags)
 251 {
 252         void *hdr;
 253
 254         hdr = genlmsg_put(msg, pid, seq, &nfc_genl_family, flags,
 255                           NFC_CMD_GET_DEVICE);
 256         if (!hdr)
 257                 return -EMSGSIZE;
 258
 259         if (cb)
 260                 genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
 261
 262         NLA_PUT_STRING(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev));
 263         NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
 264         NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols);
 265         NLA_PUT_U8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up);
 266
 267         return genlmsg_end(msg, hdr);
 268
 269 nla_put_failure:
 270         genlmsg_cancel(msg, hdr);
 271         return -EMSGSIZE;
 272 }
 273
 274 static int nfc_genl_dump_devices(struct sk_buff *skb,
 275                                  struct netlink_callback *cb)
 276 {
 277         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
 278         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 279         bool first_call = false;
 280
 281         if (!iter) {
 282                 first_call = true;
 283                 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
 284                 if (!iter)
 285                         return -ENOMEM;
 286                 cb->args[0] = (long) iter;
 287         }
 288
 289         mutex_lock(&nfc_devlist_mutex);
 290
 291         cb->seq = nfc_devlist_generation;
 292
 293         if (first_call) {
 294                 nfc_device_iter_init(iter);
 295                 dev = nfc_device_iter_next(iter);
 296         }
 297
 298         while (dev) {
 299                 int rc;
 300
 301                 rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).pid,
 302                                           cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
 303                 if (rc < 0)
 304                         break;
 305
 306                 dev = nfc_device_iter_next(iter);
 307         }
 308
 309         mutex_unlock(&nfc_devlist_mutex);
 310
 311         cb->args[1] = (long) dev;
 312
 313         return skb->len;
 314 }
 315
 316 static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
 317 {
 318         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
 319
 320         nfc_device_iter_exit(iter);
 321         kfree(iter);
 322
 323         return 0;
 324 }
 325
 326 int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
 327                                u8 comm_mode, u8 rf_mode)
 328 {
 329         struct sk_buff *msg;
 330         void *hdr;
 331
 332         pr_debug("DEP link is up\n");
 333
 334         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
 335         if (!msg)
 336                 return -ENOMEM;
 337
 338         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP);
 339         if (!hdr)
 340                 goto free_msg;
 341
 342         NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
 343         if (rf_mode == NFC_RF_INITIATOR)
 344                 NLA_PUT_U32(msg, NFC_ATTR_TARGET_INDEX, target_idx);
 345         NLA_PUT_U8(msg, NFC_ATTR_COMM_MODE, comm_mode);
 346         NLA_PUT_U8(msg, NFC_ATTR_RF_MODE, rf_mode);
 347
 348         genlmsg_end(msg, hdr);
 349
 350         dev->dep_link_up = true;
 351
 352         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
 353
 354         return 0;
 355
 356 nla_put_failure:
 357         genlmsg_cancel(msg, hdr);
 358 free_msg:
 359         nlmsg_free(msg);
 360         return -EMSGSIZE;
 361 }
 362
 363 int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
 364 {
 365         struct sk_buff *msg;
 366         void *hdr;
 367
 368         pr_debug("DEP link is down\n");
 369
 370         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
 371         if (!msg)
 372                 return -ENOMEM;
 373
 374         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 375                           NFC_CMD_DEP_LINK_DOWN);
 376         if (!hdr)
 377                 goto free_msg;
 378
 379         NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
 380
 381         genlmsg_end(msg, hdr);
 382
 383         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
 384
 385         return 0;
 386
 387 nla_put_failure:
 388         genlmsg_cancel(msg, hdr);
 389 free_msg:
 390         nlmsg_free(msg);
 391         return -EMSGSIZE;
 392 }
 393
 394 static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
 395 {
 396         struct sk_buff *msg;
 397         struct nfc_dev *dev;
 398         u32 idx;
 399         int rc = -ENOBUFS;
 400
 401         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 402                 return -EINVAL;
 403
 404         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 405
 406         dev = nfc_get_device(idx);
 407         if (!dev)
 408                 return -ENODEV;
 409
 410         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 411         if (!msg) {
 412                 rc = -ENOMEM;
 413                 goto out_putdev;
 414         }
 415
 416         rc = nfc_genl_send_device(msg, dev, info->snd_pid, info->snd_seq,
 417                                   NULL, 0);
 418         if (rc < 0)
 419                 goto out_free;
 420
 421         nfc_put_device(dev);
 422
 423         return genlmsg_reply(msg, info);
 424
 425 out_free:
 426         nlmsg_free(msg);
 427 out_putdev:
 428         nfc_put_device(dev);
 429         return rc;
 430 }
 431
 432 static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info)
 433 {
 434         struct nfc_dev *dev;
 435         int rc;
 436         u32 idx;
 437
 438         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 439                 return -EINVAL;
 440
 441         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 442
 443         dev = nfc_get_device(idx);
 444         if (!dev)
 445                 return -ENODEV;
 446
 447         rc = nfc_dev_up(dev);
 448
 449         nfc_put_device(dev);
 450         return rc;
 451 }
 452
 453 static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info)
 454 {
 455         struct nfc_dev *dev;
 456         int rc;
 457         u32 idx;
 458
 459         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 460                 return -EINVAL;
 461
 462         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 463
 464         dev = nfc_get_device(idx);
 465         if (!dev)
 466                 return -ENODEV;
 467
 468         rc = nfc_dev_down(dev);
 469
 470         nfc_put_device(dev);
 471         return rc;
 472 }
 473
 474 static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
 475 {
 476         struct nfc_dev *dev;
 477         int rc;
 478         u32 idx;
 479         u32 protocols;
 480
 481         pr_debug("Poll start\n");
 482
 483         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 484             !info->attrs[NFC_ATTR_PROTOCOLS])
 485                 return -EINVAL;
 486
 487         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 488         protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
 489
 490         dev = nfc_get_device(idx);
 491         if (!dev)
 492                 return -ENODEV;
 493
 494         mutex_lock(&dev->genl_data.genl_data_mutex);
 495
 496         rc = nfc_start_poll(dev, protocols);
 497         if (!rc)
 498                 dev->genl_data.poll_req_pid = info->snd_pid;
 499
 500         mutex_unlock(&dev->genl_data.genl_data_mutex);
 501
 502         nfc_put_device(dev);
 503         return rc;
 504 }
 505
 506 static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
 507 {
 508         struct nfc_dev *dev;
 509         int rc;
 510         u32 idx;
 511
 512         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 513                 return -EINVAL;
 514
 515         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 516
 517         dev = nfc_get_device(idx);
 518         if (!dev)
 519                 return -ENODEV;
 520
 521         mutex_lock(&dev->genl_data.genl_data_mutex);
 522
 523         if (dev->genl_data.poll_req_pid != info->snd_pid) {
 524                 rc = -EBUSY;
 525                 goto out;
 526         }
 527
 528         rc = nfc_stop_poll(dev);
 529         dev->genl_data.poll_req_pid = 0;
 530
 531 out:
 532         mutex_unlock(&dev->genl_data.genl_data_mutex);
 533         nfc_put_device(dev);
 534         return rc;
 535 }
 536
 537 static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
 538 {
 539         struct nfc_dev *dev;
 540         int rc, tgt_idx;
 541         u32 idx;
 542         u8 comm;
 543
 544         pr_debug("DEP link up\n");
 545
 546         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 547             !info->attrs[NFC_ATTR_COMM_MODE])
 548                 return -EINVAL;
 549
 550         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 551         if (!info->attrs[NFC_ATTR_TARGET_INDEX])
 552                 tgt_idx = NFC_TARGET_IDX_ANY;
 553         else
 554                 tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
 555
 556         comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
 557
 558         if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
 559                 return -EINVAL;
 560
 561         dev = nfc_get_device(idx);
 562         if (!dev)
 563                 return -ENODEV;
 564
 565         rc = nfc_dep_link_up(dev, tgt_idx, comm);
 566
 567         nfc_put_device(dev);
 568
 569         return rc;
 570 }
 571
 572 static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
 573 {
 574         struct nfc_dev *dev;
 575         int rc;
 576         u32 idx;
 577
 578         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 579                 return -EINVAL;
 580
 581         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 582
 583         dev = nfc_get_device(idx);
 584         if (!dev)
 585                 return -ENODEV;
 586
 587         rc = nfc_dep_link_down(dev);
 588
 589         nfc_put_device(dev);
 590         return rc;
 591 }
 592
 593 static struct genl_ops nfc_genl_ops[] = {
 594         {
 595                 .cmd = NFC_CMD_GET_DEVICE,
 596                 .doit = nfc_genl_get_device,
 597                 .dumpit = nfc_genl_dump_devices,
 598                 .done = nfc_genl_dump_devices_done,
 599                 .policy = nfc_genl_policy,
 600         },
 601         {
 602                 .cmd = NFC_CMD_DEV_UP,
 603                 .doit = nfc_genl_dev_up,
 604                 .policy = nfc_genl_policy,
 605         },
 606         {
 607                 .cmd = NFC_CMD_DEV_DOWN,
 608                 .doit = nfc_genl_dev_down,
 609                 .policy = nfc_genl_policy,
 610         },
 611         {
 612                 .cmd = NFC_CMD_START_POLL,
 613                 .doit = nfc_genl_start_poll,
 614                 .policy = nfc_genl_policy,
 615         },
 616         {
 617                 .cmd = NFC_CMD_STOP_POLL,
 618                 .doit = nfc_genl_stop_poll,
 619                 .policy = nfc_genl_policy,
 620         },
 621         {
 622                 .cmd = NFC_CMD_DEP_LINK_UP,
 623                 .doit = nfc_genl_dep_link_up,
 624                 .policy = nfc_genl_policy,
 625         },
 626         {
 627                 .cmd = NFC_CMD_DEP_LINK_DOWN,
 628                 .doit = nfc_genl_dep_link_down,
 629                 .policy = nfc_genl_policy,
 630         },
 631         {
 632                 .cmd = NFC_CMD_GET_TARGET,
 633                 .dumpit = nfc_genl_dump_targets,
 634                 .done = nfc_genl_dump_targets_done,
 635                 .policy = nfc_genl_policy,
 636         },
 637 };
 638
 639 static int nfc_genl_rcv_nl_event(struct notifier_block *this,
 640                                  unsigned long event, void *ptr)
 641 {
 642         struct netlink_notify *n = ptr;
 643         struct class_dev_iter iter;
 644         struct nfc_dev *dev;
 645
 646         if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
 647                 goto out;
 648
 649         pr_debug("NETLINK_URELEASE event from id %d\n", n->pid);
 650
 651         nfc_device_iter_init(&iter);
 652         dev = nfc_device_iter_next(&iter);
 653
 654         while (dev) {
 655                 if (dev->genl_data.poll_req_pid == n->pid) {
 656                         nfc_stop_poll(dev);
 657                         dev->genl_data.poll_req_pid = 0;
 658                 }
 659                 dev = nfc_device_iter_next(&iter);
 660         }
 661
 662         nfc_device_iter_exit(&iter);
 663
 664 out:
 665         return NOTIFY_DONE;
 666 }
 667
 668 void nfc_genl_data_init(struct nfc_genl_data *genl_data)
 669 {
 670         genl_data->poll_req_pid = 0;
 671         mutex_init(&genl_data->genl_data_mutex);
 672 }
 673
 674 void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
 675 {
 676         mutex_destroy(&genl_data->genl_data_mutex);
 677 }
 678
 679 static struct notifier_block nl_notifier = {
 680         .notifier_call  = nfc_genl_rcv_nl_event,
 681 };
 682
 683 /**
 684  * nfc_genl_init() - Initialize netlink interface
 685  *
 686  * This initialization function registers the nfc netlink family.
 687  */
 688 int __init nfc_genl_init(void)
 689 {
 690         int rc;
 691
 692         rc = genl_register_family_with_ops(&nfc_genl_family, nfc_genl_ops,
 693                                            ARRAY_SIZE(nfc_genl_ops));
 694         if (rc)
 695                 return rc;
 696
 697         rc = genl_register_mc_group(&nfc_genl_family, &nfc_genl_event_mcgrp);
 698
 699         netlink_register_notifier(&nl_notifier);
 700
 701         return rc;
 702 }
 703
 704 /**
 705  * nfc_genl_exit() - Deinitialize netlink interface
 706  *
 707  * This exit function unregisters the nfc netlink family.
 708  */
 709 void nfc_genl_exit(void)
 710 {
 711         netlink_unregister_notifier(&nl_notifier);
 712         genl_unregister_family(&nfc_genl_family);
 713 }