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 static 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         [NFC_ATTR_IM_PROTOCOLS] = { .type = NLA_U32 },
  53         [NFC_ATTR_TM_PROTOCOLS] = { .type = NLA_U32 },
  54 };
  55
  56 static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target,
  57                                 struct netlink_callback *cb, int flags)
  58 {
  59         void *hdr;
  60
  61         hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
  62                           &nfc_genl_family, flags, NFC_CMD_GET_TARGET);
  63         if (!hdr)
  64                 return -EMSGSIZE;
  65
  66         genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
  67
  68         if (nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target->idx) ||
  69             nla_put_u32(msg, NFC_ATTR_PROTOCOLS, target->supported_protocols) ||
  70             nla_put_u16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res) ||
  71             nla_put_u8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res))
  72                 goto nla_put_failure;
  73         if (target->nfcid1_len > 0 &&
  74             nla_put(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len,
  75                     target->nfcid1))
  76                 goto nla_put_failure;
  77         if (target->sensb_res_len > 0 &&
  78             nla_put(msg, NFC_ATTR_TARGET_SENSB_RES, target->sensb_res_len,
  79                     target->sensb_res))
  80                 goto nla_put_failure;
  81         if (target->sensf_res_len > 0 &&
  82             nla_put(msg, NFC_ATTR_TARGET_SENSF_RES, target->sensf_res_len,
  83                     target->sensf_res))
  84                 goto nla_put_failure;
  85
  86         return genlmsg_end(msg, hdr);
  87
  88 nla_put_failure:
  89         genlmsg_cancel(msg, hdr);
  90         return -EMSGSIZE;
  91 }
  92
  93 static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
  94 {
  95         struct nfc_dev *dev;
  96         int rc;
  97         u32 idx;
  98
  99         rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
 100                          nfc_genl_family.attrbuf,
 101                          nfc_genl_family.maxattr,
 102                          nfc_genl_policy);
 103         if (rc < 0)
 104                 return ERR_PTR(rc);
 105
 106         if (!nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX])
 107                 return ERR_PTR(-EINVAL);
 108
 109         idx = nla_get_u32(nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX]);
 110
 111         dev = nfc_get_device(idx);
 112         if (!dev)
 113                 return ERR_PTR(-ENODEV);
 114
 115         return dev;
 116 }
 117
 118 static int nfc_genl_dump_targets(struct sk_buff *skb,
 119                                  struct netlink_callback *cb)
 120 {
 121         int i = cb->args[0];
 122         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 123         int rc;
 124
 125         if (!dev) {
 126                 dev = __get_device_from_cb(cb);
 127                 if (IS_ERR(dev))
 128                         return PTR_ERR(dev);
 129
 130                 cb->args[1] = (long) dev;
 131         }
 132
 133         device_lock(&dev->dev);
 134
 135         cb->seq = dev->targets_generation;
 136
 137         while (i < dev->n_targets) {
 138                 rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
 139                                           NLM_F_MULTI);
 140                 if (rc < 0)
 141                         break;
 142
 143                 i++;
 144         }
 145
 146         device_unlock(&dev->dev);
 147
 148         cb->args[0] = i;
 149
 150         return skb->len;
 151 }
 152
 153 static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
 154 {
 155         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 156
 157         if (dev)
 158                 nfc_put_device(dev);
 159
 160         return 0;
 161 }
 162
 163 int nfc_genl_targets_found(struct nfc_dev *dev)
 164 {
 165         struct sk_buff *msg;
 166         void *hdr;
 167
 168         dev->genl_data.poll_req_pid = 0;
 169
 170         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
 171         if (!msg)
 172                 return -ENOMEM;
 173
 174         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 175                           NFC_EVENT_TARGETS_FOUND);
 176         if (!hdr)
 177                 goto free_msg;
 178
 179         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 180                 goto nla_put_failure;
 181
 182         genlmsg_end(msg, hdr);
 183
 184         return genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
 185
 186 nla_put_failure:
 187         genlmsg_cancel(msg, hdr);
 188 free_msg:
 189         nlmsg_free(msg);
 190         return -EMSGSIZE;
 191 }
 192
 193 int nfc_genl_target_lost(struct nfc_dev *dev, u32 target_idx)
 194 {
 195         struct sk_buff *msg;
 196         void *hdr;
 197
 198         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 199         if (!msg)
 200                 return -ENOMEM;
 201
 202         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 203                           NFC_EVENT_TARGET_LOST);
 204         if (!hdr)
 205                 goto free_msg;
 206
 207         if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
 208             nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
 209                 goto nla_put_failure;
 210
 211         genlmsg_end(msg, hdr);
 212
 213         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
 214
 215         return 0;
 216
 217 nla_put_failure:
 218         genlmsg_cancel(msg, hdr);
 219 free_msg:
 220         nlmsg_free(msg);
 221         return -EMSGSIZE;
 222 }
 223
 224 int nfc_genl_device_added(struct nfc_dev *dev)
 225 {
 226         struct sk_buff *msg;
 227         void *hdr;
 228
 229         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 230         if (!msg)
 231                 return -ENOMEM;
 232
 233         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 234                           NFC_EVENT_DEVICE_ADDED);
 235         if (!hdr)
 236                 goto free_msg;
 237
 238         if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
 239             nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
 240             nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) ||
 241             nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up))
 242                 goto nla_put_failure;
 243
 244         genlmsg_end(msg, hdr);
 245
 246         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
 247
 248         return 0;
 249
 250 nla_put_failure:
 251         genlmsg_cancel(msg, hdr);
 252 free_msg:
 253         nlmsg_free(msg);
 254         return -EMSGSIZE;
 255 }
 256
 257 int nfc_genl_device_removed(struct nfc_dev *dev)
 258 {
 259         struct sk_buff *msg;
 260         void *hdr;
 261
 262         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 263         if (!msg)
 264                 return -ENOMEM;
 265
 266         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 267                           NFC_EVENT_DEVICE_REMOVED);
 268         if (!hdr)
 269                 goto free_msg;
 270
 271         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 272                 goto nla_put_failure;
 273
 274         genlmsg_end(msg, hdr);
 275
 276         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
 277
 278         return 0;
 279
 280 nla_put_failure:
 281         genlmsg_cancel(msg, hdr);
 282 free_msg:
 283         nlmsg_free(msg);
 284         return -EMSGSIZE;
 285 }
 286
 287 static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
 288                                 u32 pid, u32 seq,
 289                                 struct netlink_callback *cb,
 290                                 int flags)
 291 {
 292         void *hdr;
 293
 294         hdr = genlmsg_put(msg, pid, seq, &nfc_genl_family, flags,
 295                           NFC_CMD_GET_DEVICE);
 296         if (!hdr)
 297                 return -EMSGSIZE;
 298
 299         if (cb)
 300                 genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
 301
 302         if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
 303             nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
 304             nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) ||
 305             nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up))
 306                 goto nla_put_failure;
 307
 308         return genlmsg_end(msg, hdr);
 309
 310 nla_put_failure:
 311         genlmsg_cancel(msg, hdr);
 312         return -EMSGSIZE;
 313 }
 314
 315 static int nfc_genl_dump_devices(struct sk_buff *skb,
 316                                  struct netlink_callback *cb)
 317 {
 318         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
 319         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 320         bool first_call = false;
 321
 322         if (!iter) {
 323                 first_call = true;
 324                 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
 325                 if (!iter)
 326                         return -ENOMEM;
 327                 cb->args[0] = (long) iter;
 328         }
 329
 330         mutex_lock(&nfc_devlist_mutex);
 331
 332         cb->seq = nfc_devlist_generation;
 333
 334         if (first_call) {
 335                 nfc_device_iter_init(iter);
 336                 dev = nfc_device_iter_next(iter);
 337         }
 338
 339         while (dev) {
 340                 int rc;
 341
 342                 rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).pid,
 343                                           cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
 344                 if (rc < 0)
 345                         break;
 346
 347                 dev = nfc_device_iter_next(iter);
 348         }
 349
 350         mutex_unlock(&nfc_devlist_mutex);
 351
 352         cb->args[1] = (long) dev;
 353
 354         return skb->len;
 355 }
 356
 357 static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
 358 {
 359         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
 360
 361         nfc_device_iter_exit(iter);
 362         kfree(iter);
 363
 364         return 0;
 365 }
 366
 367 int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
 368                                u8 comm_mode, u8 rf_mode)
 369 {
 370         struct sk_buff *msg;
 371         void *hdr;
 372
 373         pr_debug("DEP link is up\n");
 374
 375         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
 376         if (!msg)
 377                 return -ENOMEM;
 378
 379         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP);
 380         if (!hdr)
 381                 goto free_msg;
 382
 383         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 384                 goto nla_put_failure;
 385         if (rf_mode == NFC_RF_INITIATOR &&
 386             nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
 387                 goto nla_put_failure;
 388         if (nla_put_u8(msg, NFC_ATTR_COMM_MODE, comm_mode) ||
 389             nla_put_u8(msg, NFC_ATTR_RF_MODE, rf_mode))
 390                 goto nla_put_failure;
 391
 392         genlmsg_end(msg, hdr);
 393
 394         dev->dep_link_up = true;
 395
 396         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
 397
 398         return 0;
 399
 400 nla_put_failure:
 401         genlmsg_cancel(msg, hdr);
 402 free_msg:
 403         nlmsg_free(msg);
 404         return -EMSGSIZE;
 405 }
 406
 407 int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
 408 {
 409         struct sk_buff *msg;
 410         void *hdr;
 411
 412         pr_debug("DEP link is down\n");
 413
 414         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
 415         if (!msg)
 416                 return -ENOMEM;
 417
 418         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 419                           NFC_CMD_DEP_LINK_DOWN);
 420         if (!hdr)
 421                 goto free_msg;
 422
 423         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 424                 goto nla_put_failure;
 425
 426         genlmsg_end(msg, hdr);
 427
 428         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
 429
 430         return 0;
 431
 432 nla_put_failure:
 433         genlmsg_cancel(msg, hdr);
 434 free_msg:
 435         nlmsg_free(msg);
 436         return -EMSGSIZE;
 437 }
 438
 439 static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
 440 {
 441         struct sk_buff *msg;
 442         struct nfc_dev *dev;
 443         u32 idx;
 444         int rc = -ENOBUFS;
 445
 446         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 447                 return -EINVAL;
 448
 449         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 450
 451         dev = nfc_get_device(idx);
 452         if (!dev)
 453                 return -ENODEV;
 454
 455         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 456         if (!msg) {
 457                 rc = -ENOMEM;
 458                 goto out_putdev;
 459         }
 460
 461         rc = nfc_genl_send_device(msg, dev, info->snd_pid, info->snd_seq,
 462                                   NULL, 0);
 463         if (rc < 0)
 464                 goto out_free;
 465
 466         nfc_put_device(dev);
 467
 468         return genlmsg_reply(msg, info);
 469
 470 out_free:
 471         nlmsg_free(msg);
 472 out_putdev:
 473         nfc_put_device(dev);
 474         return rc;
 475 }
 476
 477 static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info)
 478 {
 479         struct nfc_dev *dev;
 480         int rc;
 481         u32 idx;
 482
 483         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 484                 return -EINVAL;
 485
 486         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 487
 488         dev = nfc_get_device(idx);
 489         if (!dev)
 490                 return -ENODEV;
 491
 492         rc = nfc_dev_up(dev);
 493
 494         nfc_put_device(dev);
 495         return rc;
 496 }
 497
 498 static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info)
 499 {
 500         struct nfc_dev *dev;
 501         int rc;
 502         u32 idx;
 503
 504         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 505                 return -EINVAL;
 506
 507         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 508
 509         dev = nfc_get_device(idx);
 510         if (!dev)
 511                 return -ENODEV;
 512
 513         rc = nfc_dev_down(dev);
 514
 515         nfc_put_device(dev);
 516         return rc;
 517 }
 518
 519 static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
 520 {
 521         struct nfc_dev *dev;
 522         int rc;
 523         u32 idx;
 524         u32 im_protocols = 0, tm_protocols = 0;
 525
 526         pr_debug("Poll start\n");
 527
 528         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 529             ((!info->attrs[NFC_ATTR_IM_PROTOCOLS] &&
 530               !info->attrs[NFC_ATTR_PROTOCOLS]) &&
 531              !info->attrs[NFC_ATTR_TM_PROTOCOLS]))
 532                 return -EINVAL;
 533
 534         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 535
 536         if (info->attrs[NFC_ATTR_TM_PROTOCOLS])
 537                 tm_protocols = nla_get_u32(info->attrs[NFC_ATTR_TM_PROTOCOLS]);
 538         else if (info->attrs[NFC_ATTR_PROTOCOLS])
 539                 tm_protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
 540
 541         if (info->attrs[NFC_ATTR_IM_PROTOCOLS])
 542                 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_IM_PROTOCOLS]);
 543
 544         dev = nfc_get_device(idx);
 545         if (!dev)
 546                 return -ENODEV;
 547
 548         mutex_lock(&dev->genl_data.genl_data_mutex);
 549
 550         rc = nfc_start_poll(dev, im_protocols, tm_protocols);
 551         if (!rc)
 552                 dev->genl_data.poll_req_pid = info->snd_pid;
 553
 554         mutex_unlock(&dev->genl_data.genl_data_mutex);
 555
 556         nfc_put_device(dev);
 557         return rc;
 558 }
 559
 560 static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
 561 {
 562         struct nfc_dev *dev;
 563         int rc;
 564         u32 idx;
 565
 566         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 567                 return -EINVAL;
 568
 569         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 570
 571         dev = nfc_get_device(idx);
 572         if (!dev)
 573                 return -ENODEV;
 574
 575         mutex_lock(&dev->genl_data.genl_data_mutex);
 576
 577         if (dev->genl_data.poll_req_pid != info->snd_pid) {
 578                 rc = -EBUSY;
 579                 goto out;
 580         }
 581
 582         rc = nfc_stop_poll(dev);
 583         dev->genl_data.poll_req_pid = 0;
 584
 585 out:
 586         mutex_unlock(&dev->genl_data.genl_data_mutex);
 587         nfc_put_device(dev);
 588         return rc;
 589 }
 590
 591 static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
 592 {
 593         struct nfc_dev *dev;
 594         int rc, tgt_idx;
 595         u32 idx;
 596         u8 comm;
 597
 598         pr_debug("DEP link up\n");
 599
 600         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 601             !info->attrs[NFC_ATTR_COMM_MODE])
 602                 return -EINVAL;
 603
 604         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 605         if (!info->attrs[NFC_ATTR_TARGET_INDEX])
 606                 tgt_idx = NFC_TARGET_IDX_ANY;
 607         else
 608                 tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
 609
 610         comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
 611
 612         if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
 613                 return -EINVAL;
 614
 615         dev = nfc_get_device(idx);
 616         if (!dev)
 617                 return -ENODEV;
 618
 619         rc = nfc_dep_link_up(dev, tgt_idx, comm);
 620
 621         nfc_put_device(dev);
 622
 623         return rc;
 624 }
 625
 626 static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
 627 {
 628         struct nfc_dev *dev;
 629         int rc;
 630         u32 idx;
 631
 632         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 633                 return -EINVAL;
 634
 635         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 636
 637         dev = nfc_get_device(idx);
 638         if (!dev)
 639                 return -ENODEV;
 640
 641         rc = nfc_dep_link_down(dev);
 642
 643         nfc_put_device(dev);
 644         return rc;
 645 }
 646
 647 static struct genl_ops nfc_genl_ops[] = {
 648         {
 649                 .cmd = NFC_CMD_GET_DEVICE,
 650                 .doit = nfc_genl_get_device,
 651                 .dumpit = nfc_genl_dump_devices,
 652                 .done = nfc_genl_dump_devices_done,
 653                 .policy = nfc_genl_policy,
 654         },
 655         {
 656                 .cmd = NFC_CMD_DEV_UP,
 657                 .doit = nfc_genl_dev_up,
 658                 .policy = nfc_genl_policy,
 659         },
 660         {
 661                 .cmd = NFC_CMD_DEV_DOWN,
 662                 .doit = nfc_genl_dev_down,
 663                 .policy = nfc_genl_policy,
 664         },
 665         {
 666                 .cmd = NFC_CMD_START_POLL,
 667                 .doit = nfc_genl_start_poll,
 668                 .policy = nfc_genl_policy,
 669         },
 670         {
 671                 .cmd = NFC_CMD_STOP_POLL,
 672                 .doit = nfc_genl_stop_poll,
 673                 .policy = nfc_genl_policy,
 674         },
 675         {
 676                 .cmd = NFC_CMD_DEP_LINK_UP,
 677                 .doit = nfc_genl_dep_link_up,
 678                 .policy = nfc_genl_policy,
 679         },
 680         {
 681                 .cmd = NFC_CMD_DEP_LINK_DOWN,
 682                 .doit = nfc_genl_dep_link_down,
 683                 .policy = nfc_genl_policy,
 684         },
 685         {
 686                 .cmd = NFC_CMD_GET_TARGET,
 687                 .dumpit = nfc_genl_dump_targets,
 688                 .done = nfc_genl_dump_targets_done,
 689                 .policy = nfc_genl_policy,
 690         },
 691 };
 692
 693 static int nfc_genl_rcv_nl_event(struct notifier_block *this,
 694                                  unsigned long event, void *ptr)
 695 {
 696         struct netlink_notify *n = ptr;
 697         struct class_dev_iter iter;
 698         struct nfc_dev *dev;
 699
 700         if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
 701                 goto out;
 702
 703         pr_debug("NETLINK_URELEASE event from id %d\n", n->pid);
 704
 705         nfc_device_iter_init(&iter);
 706         dev = nfc_device_iter_next(&iter);
 707
 708         while (dev) {
 709                 if (dev->genl_data.poll_req_pid == n->pid) {
 710                         nfc_stop_poll(dev);
 711                         dev->genl_data.poll_req_pid = 0;
 712                 }
 713                 dev = nfc_device_iter_next(&iter);
 714         }
 715
 716         nfc_device_iter_exit(&iter);
 717
 718 out:
 719         return NOTIFY_DONE;
 720 }
 721
 722 void nfc_genl_data_init(struct nfc_genl_data *genl_data)
 723 {
 724         genl_data->poll_req_pid = 0;
 725         mutex_init(&genl_data->genl_data_mutex);
 726 }
 727
 728 void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
 729 {
 730         mutex_destroy(&genl_data->genl_data_mutex);
 731 }
 732
 733 static struct notifier_block nl_notifier = {
 734         .notifier_call  = nfc_genl_rcv_nl_event,
 735 };
 736
 737 /**
 738  * nfc_genl_init() - Initialize netlink interface
 739  *
 740  * This initialization function registers the nfc netlink family.
 741  */
 742 int __init nfc_genl_init(void)
 743 {
 744         int rc;
 745
 746         rc = genl_register_family_with_ops(&nfc_genl_family, nfc_genl_ops,
 747                                            ARRAY_SIZE(nfc_genl_ops));
 748         if (rc)
 749                 return rc;
 750
 751         rc = genl_register_mc_group(&nfc_genl_family, &nfc_genl_event_mcgrp);
 752
 753         netlink_register_notifier(&nl_notifier);
 754
 755         return rc;
 756 }
 757
 758 /**
 759  * nfc_genl_exit() - Deinitialize netlink interface
 760  *
 761  * This exit function unregisters the nfc netlink family.
 762  */
 763 void nfc_genl_exit(void)
 764 {
 765         netlink_unregister_notifier(&nl_notifier);
 766         genl_unregister_family(&nfc_genl_family);
 767 }