Pileus Git - ~andy/linux/blob - 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         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
 204         genlmsg_end(msg, hdr);
 205
 206         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
 207
 208         return 0;
 209
 210 nla_put_failure:
 211         genlmsg_cancel(msg, hdr);
 212 free_msg:
 213         nlmsg_free(msg);
 214         return -EMSGSIZE;
 215 }
 216
 217 int nfc_genl_device_removed(struct nfc_dev *dev)
 218 {
 219         struct sk_buff *msg;
 220         void *hdr;
 221
 222         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 223         if (!msg)
 224                 return -ENOMEM;
 225
 226         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 227                                 NFC_EVENT_DEVICE_REMOVED);
 228         if (!hdr)
 229                 goto free_msg;
 230
 231         NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
 232
 233         genlmsg_end(msg, hdr);
 234
 235         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
 236
 237         return 0;
 238
 239 nla_put_failure:
 240         genlmsg_cancel(msg, hdr);
 241 free_msg:
 242         nlmsg_free(msg);
 243         return -EMSGSIZE;
 244 }
 245
 246 static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
 247                                                 u32 pid, u32 seq,
 248                                                 struct netlink_callback *cb,
 249                                                 int flags)
 250 {
 251         void *hdr;
 252
 253         hdr = genlmsg_put(msg, pid, seq, &nfc_genl_family, flags,
 254                                                         NFC_CMD_GET_DEVICE);
 255         if (!hdr)
 256                 return -EMSGSIZE;
 257
 258         if (cb)
 259                 genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
 260
 261         NLA_PUT_STRING(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev));
 262         NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
 263         NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols);
 264
 265         return genlmsg_end(msg, hdr);
 266
 267 nla_put_failure:
 268         genlmsg_cancel(msg, hdr);
 269         return -EMSGSIZE;
 270 }
 271
 272 static int nfc_genl_dump_devices(struct sk_buff *skb,
 273                                 struct netlink_callback *cb)
 274 {
 275         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
 276         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 277         bool first_call = false;
 278
 279         if (!iter) {
 280                 first_call = true;
 281                 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
 282                 if (!iter)
 283                         return -ENOMEM;
 284                 cb->args[0] = (long) iter;
 285         }
 286
 287         mutex_lock(&nfc_devlist_mutex);
 288
 289         cb->seq = nfc_devlist_generation;
 290
 291         if (first_call) {
 292                 nfc_device_iter_init(iter);
 293                 dev = nfc_device_iter_next(iter);
 294         }
 295
 296         while (dev) {
 297                 int rc;
 298
 299                 rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).pid,
 300                                                         cb->nlh->nlmsg_seq,
 301                                                         cb, NLM_F_MULTI);
 302                 if (rc < 0)
 303                         break;
 304
 305                 dev = nfc_device_iter_next(iter);
 306         }
 307
 308         mutex_unlock(&nfc_devlist_mutex);
 309
 310         cb->args[1] = (long) dev;
 311
 312         return skb->len;
 313 }
 314
 315 static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
 316 {
 317         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
 318
 319         nfc_device_iter_exit(iter);
 320         kfree(iter);
 321
 322         return 0;
 323 }
 324
 325 int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
 326                                                 u8 comm_mode, u8 rf_mode)
 327 {
 328         struct sk_buff *msg;
 329         void *hdr;
 330
 331         pr_debug("DEP link is up\n");
 332
 333         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
 334         if (!msg)
 335                 return -ENOMEM;
 336
 337         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 338                                 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, rf;
 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                         !info->attrs[NFC_ATTR_RF_MODE])
 549                 return -EINVAL;
 550
 551         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 552         if (!info->attrs[NFC_ATTR_TARGET_INDEX])
 553                 tgt_idx = NFC_TARGET_IDX_ANY;
 554         else
 555                 tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
 556
 557         comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
 558         rf = nla_get_u8(info->attrs[NFC_ATTR_RF_MODE]);
 559
 560         if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
 561                 return -EINVAL;
 562
 563         if (rf != NFC_RF_INITIATOR && comm != NFC_RF_TARGET)
 564                 return -EINVAL;
 565
 566         dev = nfc_get_device(idx);
 567         if (!dev)
 568                 return -ENODEV;
 569
 570         rc = nfc_dep_link_up(dev, tgt_idx, comm, rf);
 571
 572         nfc_put_device(dev);
 573
 574         return rc;
 575 }
 576
 577 static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
 578 {
 579         struct nfc_dev *dev;
 580         int rc;
 581         u32 idx;
 582
 583         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 584                 return -EINVAL;
 585
 586         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 587
 588         dev = nfc_get_device(idx);
 589         if (!dev)
 590                 return -ENODEV;
 591
 592         rc = nfc_dep_link_down(dev);
 593
 594         nfc_put_device(dev);
 595         return rc;
 596 }
 597
 598 static struct genl_ops nfc_genl_ops[] = {
 599         {
 600                 .cmd = NFC_CMD_GET_DEVICE,
 601                 .doit = nfc_genl_get_device,
 602                 .dumpit = nfc_genl_dump_devices,
 603                 .done = nfc_genl_dump_devices_done,
 604                 .policy = nfc_genl_policy,
 605         },
 606         {
 607                 .cmd = NFC_CMD_DEV_UP,
 608                 .doit = nfc_genl_dev_up,
 609                 .policy = nfc_genl_policy,
 610         },
 611         {
 612                 .cmd = NFC_CMD_DEV_DOWN,
 613                 .doit = nfc_genl_dev_down,
 614                 .policy = nfc_genl_policy,
 615         },
 616         {
 617                 .cmd = NFC_CMD_START_POLL,
 618                 .doit = nfc_genl_start_poll,
 619                 .policy = nfc_genl_policy,
 620         },
 621         {
 622                 .cmd = NFC_CMD_STOP_POLL,
 623                 .doit = nfc_genl_stop_poll,
 624                 .policy = nfc_genl_policy,
 625         },
 626         {
 627                 .cmd = NFC_CMD_DEP_LINK_UP,
 628                 .doit = nfc_genl_dep_link_up,
 629                 .policy = nfc_genl_policy,
 630         },
 631         {
 632                 .cmd = NFC_CMD_DEP_LINK_DOWN,
 633                 .doit = nfc_genl_dep_link_down,
 634                 .policy = nfc_genl_policy,
 635         },
 636         {
 637                 .cmd = NFC_CMD_GET_TARGET,
 638                 .dumpit = nfc_genl_dump_targets,
 639                 .done = nfc_genl_dump_targets_done,
 640                 .policy = nfc_genl_policy,
 641         },
 642 };
 643
 644 static int nfc_genl_rcv_nl_event(struct notifier_block *this,
 645                                                 unsigned long event, void *ptr)
 646 {
 647         struct netlink_notify *n = ptr;
 648         struct class_dev_iter iter;
 649         struct nfc_dev *dev;
 650
 651         if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
 652                 goto out;
 653
 654         pr_debug("NETLINK_URELEASE event from id %d\n", n->pid);
 655
 656         nfc_device_iter_init(&iter);
 657         dev = nfc_device_iter_next(&iter);
 658
 659         while (dev) {
 660                 if (dev->genl_data.poll_req_pid == n->pid) {
 661                         nfc_stop_poll(dev);
 662                         dev->genl_data.poll_req_pid = 0;
 663                 }
 664                 dev = nfc_device_iter_next(&iter);
 665         }
 666
 667         nfc_device_iter_exit(&iter);
 668
 669 out:
 670         return NOTIFY_DONE;
 671 }
 672
 673 void nfc_genl_data_init(struct nfc_genl_data *genl_data)
 674 {
 675         genl_data->poll_req_pid = 0;
 676         mutex_init(&genl_data->genl_data_mutex);
 677 }
 678
 679 void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
 680 {
 681         mutex_destroy(&genl_data->genl_data_mutex);
 682 }
 683
 684 static struct notifier_block nl_notifier = {
 685         .notifier_call  = nfc_genl_rcv_nl_event,
 686 };
 687
 688 /**
 689  * nfc_genl_init() - Initialize netlink interface
 690  *
 691  * This initialization function registers the nfc netlink family.
 692  */
 693 int __init nfc_genl_init(void)
 694 {
 695         int rc;
 696
 697         rc = genl_register_family_with_ops(&nfc_genl_family, nfc_genl_ops,
 698                                         ARRAY_SIZE(nfc_genl_ops));
 699         if (rc)
 700                 return rc;
 701
 702         rc = genl_register_mc_group(&nfc_genl_family, &nfc_genl_event_mcgrp);
 703
 704         netlink_register_notifier(&nl_notifier);
 705
 706         return rc;
 707 }
 708
 709 /**
 710  * nfc_genl_exit() - Deinitialize netlink interface
 711  *
 712  * This exit function unregisters the nfc netlink family.
 713  */
 714 void nfc_genl_exit(void)
 715 {
 716         netlink_unregister_notifier(&nl_notifier);
 717         genl_unregister_family(&nfc_genl_family);
 718 }