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 #include "llcp.h"
  32
  33 static struct genl_multicast_group nfc_genl_event_mcgrp = {
  34         .name = NFC_GENL_MCAST_EVENT_NAME,
  35 };
  36
  37 static struct genl_family nfc_genl_family = {
  38         .id = GENL_ID_GENERATE,
  39         .hdrsize = 0,
  40         .name = NFC_GENL_NAME,
  41         .version = NFC_GENL_VERSION,
  42         .maxattr = NFC_ATTR_MAX,
  43 };
  44
  45 static const struct nla_policy nfc_genl_policy[NFC_ATTR_MAX + 1] = {
  46         [NFC_ATTR_DEVICE_INDEX] = { .type = NLA_U32 },
  47         [NFC_ATTR_DEVICE_NAME] = { .type = NLA_STRING,
  48                                 .len = NFC_DEVICE_NAME_MAXSIZE },
  49         [NFC_ATTR_PROTOCOLS] = { .type = NLA_U32 },
  50         [NFC_ATTR_COMM_MODE] = { .type = NLA_U8 },
  51         [NFC_ATTR_RF_MODE] = { .type = NLA_U8 },
  52         [NFC_ATTR_DEVICE_POWERED] = { .type = NLA_U8 },
  53         [NFC_ATTR_IM_PROTOCOLS] = { .type = NLA_U32 },
  54         [NFC_ATTR_TM_PROTOCOLS] = { .type = NLA_U32 },
  55         [NFC_ATTR_LLC_PARAM_LTO] = { .type = NLA_U8 },
  56         [NFC_ATTR_LLC_PARAM_RW] = { .type = NLA_U8 },
  57         [NFC_ATTR_LLC_PARAM_MIUX] = { .type = NLA_U16 },
  58         [NFC_ATTR_LLC_SDP] = { .type = NLA_NESTED },
  59         [NFC_ATTR_FIRMWARE_NAME] = { .type = NLA_STRING,
  60                                      .len = NFC_FIRMWARE_NAME_MAXSIZE },
  61 };
  62
  63 static const struct nla_policy nfc_sdp_genl_policy[NFC_SDP_ATTR_MAX + 1] = {
  64         [NFC_SDP_ATTR_URI] = { .type = NLA_STRING },
  65         [NFC_SDP_ATTR_SAP] = { .type = NLA_U8 },
  66 };
  67
  68 static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target,
  69                                 struct netlink_callback *cb, int flags)
  70 {
  71         void *hdr;
  72
  73         hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
  74                           &nfc_genl_family, flags, NFC_CMD_GET_TARGET);
  75         if (!hdr)
  76                 return -EMSGSIZE;
  77
  78         genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
  79
  80         if (nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target->idx) ||
  81             nla_put_u32(msg, NFC_ATTR_PROTOCOLS, target->supported_protocols) ||
  82             nla_put_u16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res) ||
  83             nla_put_u8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res))
  84                 goto nla_put_failure;
  85         if (target->nfcid1_len > 0 &&
  86             nla_put(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len,
  87                     target->nfcid1))
  88                 goto nla_put_failure;
  89         if (target->sensb_res_len > 0 &&
  90             nla_put(msg, NFC_ATTR_TARGET_SENSB_RES, target->sensb_res_len,
  91                     target->sensb_res))
  92                 goto nla_put_failure;
  93         if (target->sensf_res_len > 0 &&
  94             nla_put(msg, NFC_ATTR_TARGET_SENSF_RES, target->sensf_res_len,
  95                     target->sensf_res))
  96                 goto nla_put_failure;
  97
  98         return genlmsg_end(msg, hdr);
  99
 100 nla_put_failure:
 101         genlmsg_cancel(msg, hdr);
 102         return -EMSGSIZE;
 103 }
 104
 105 static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
 106 {
 107         struct nfc_dev *dev;
 108         int rc;
 109         u32 idx;
 110
 111         rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
 112                          nfc_genl_family.attrbuf,
 113                          nfc_genl_family.maxattr,
 114                          nfc_genl_policy);
 115         if (rc < 0)
 116                 return ERR_PTR(rc);
 117
 118         if (!nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX])
 119                 return ERR_PTR(-EINVAL);
 120
 121         idx = nla_get_u32(nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX]);
 122
 123         dev = nfc_get_device(idx);
 124         if (!dev)
 125                 return ERR_PTR(-ENODEV);
 126
 127         return dev;
 128 }
 129
 130 static int nfc_genl_dump_targets(struct sk_buff *skb,
 131                                  struct netlink_callback *cb)
 132 {
 133         int i = cb->args[0];
 134         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 135         int rc;
 136
 137         if (!dev) {
 138                 dev = __get_device_from_cb(cb);
 139                 if (IS_ERR(dev))
 140                         return PTR_ERR(dev);
 141
 142                 cb->args[1] = (long) dev;
 143         }
 144
 145         device_lock(&dev->dev);
 146
 147         cb->seq = dev->targets_generation;
 148
 149         while (i < dev->n_targets) {
 150                 rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
 151                                           NLM_F_MULTI);
 152                 if (rc < 0)
 153                         break;
 154
 155                 i++;
 156         }
 157
 158         device_unlock(&dev->dev);
 159
 160         cb->args[0] = i;
 161
 162         return skb->len;
 163 }
 164
 165 static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
 166 {
 167         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 168
 169         if (dev)
 170                 nfc_put_device(dev);
 171
 172         return 0;
 173 }
 174
 175 int nfc_genl_targets_found(struct nfc_dev *dev)
 176 {
 177         struct sk_buff *msg;
 178         void *hdr;
 179
 180         dev->genl_data.poll_req_portid = 0;
 181
 182         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 183         if (!msg)
 184                 return -ENOMEM;
 185
 186         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 187                           NFC_EVENT_TARGETS_FOUND);
 188         if (!hdr)
 189                 goto free_msg;
 190
 191         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 192                 goto nla_put_failure;
 193
 194         genlmsg_end(msg, hdr);
 195
 196         return genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
 197
 198 nla_put_failure:
 199         genlmsg_cancel(msg, hdr);
 200 free_msg:
 201         nlmsg_free(msg);
 202         return -EMSGSIZE;
 203 }
 204
 205 int nfc_genl_target_lost(struct nfc_dev *dev, u32 target_idx)
 206 {
 207         struct sk_buff *msg;
 208         void *hdr;
 209
 210         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 211         if (!msg)
 212                 return -ENOMEM;
 213
 214         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 215                           NFC_EVENT_TARGET_LOST);
 216         if (!hdr)
 217                 goto free_msg;
 218
 219         if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
 220             nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
 221                 goto nla_put_failure;
 222
 223         genlmsg_end(msg, hdr);
 224
 225         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
 226
 227         return 0;
 228
 229 nla_put_failure:
 230         genlmsg_cancel(msg, hdr);
 231 free_msg:
 232         nlmsg_free(msg);
 233         return -EMSGSIZE;
 234 }
 235
 236 int nfc_genl_tm_activated(struct nfc_dev *dev, u32 protocol)
 237 {
 238         struct sk_buff *msg;
 239         void *hdr;
 240
 241         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 242         if (!msg)
 243                 return -ENOMEM;
 244
 245         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 246                           NFC_EVENT_TM_ACTIVATED);
 247         if (!hdr)
 248                 goto free_msg;
 249
 250         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 251                 goto nla_put_failure;
 252         if (nla_put_u32(msg, NFC_ATTR_TM_PROTOCOLS, protocol))
 253                 goto nla_put_failure;
 254
 255         genlmsg_end(msg, hdr);
 256
 257         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
 258
 259         return 0;
 260
 261 nla_put_failure:
 262         genlmsg_cancel(msg, hdr);
 263 free_msg:
 264         nlmsg_free(msg);
 265         return -EMSGSIZE;
 266 }
 267
 268 int nfc_genl_tm_deactivated(struct nfc_dev *dev)
 269 {
 270         struct sk_buff *msg;
 271         void *hdr;
 272
 273         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 274         if (!msg)
 275                 return -ENOMEM;
 276
 277         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 278                           NFC_EVENT_TM_DEACTIVATED);
 279         if (!hdr)
 280                 goto free_msg;
 281
 282         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 283                 goto nla_put_failure;
 284
 285         genlmsg_end(msg, hdr);
 286
 287         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
 288
 289         return 0;
 290
 291 nla_put_failure:
 292         genlmsg_cancel(msg, hdr);
 293 free_msg:
 294         nlmsg_free(msg);
 295         return -EMSGSIZE;
 296 }
 297
 298 int nfc_genl_device_added(struct nfc_dev *dev)
 299 {
 300         struct sk_buff *msg;
 301         void *hdr;
 302
 303         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 304         if (!msg)
 305                 return -ENOMEM;
 306
 307         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 308                           NFC_EVENT_DEVICE_ADDED);
 309         if (!hdr)
 310                 goto free_msg;
 311
 312         if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
 313             nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
 314             nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) ||
 315             nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up))
 316                 goto nla_put_failure;
 317
 318         genlmsg_end(msg, hdr);
 319
 320         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
 321
 322         return 0;
 323
 324 nla_put_failure:
 325         genlmsg_cancel(msg, hdr);
 326 free_msg:
 327         nlmsg_free(msg);
 328         return -EMSGSIZE;
 329 }
 330
 331 int nfc_genl_device_removed(struct nfc_dev *dev)
 332 {
 333         struct sk_buff *msg;
 334         void *hdr;
 335
 336         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 337         if (!msg)
 338                 return -ENOMEM;
 339
 340         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 341                           NFC_EVENT_DEVICE_REMOVED);
 342         if (!hdr)
 343                 goto free_msg;
 344
 345         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 346                 goto nla_put_failure;
 347
 348         genlmsg_end(msg, hdr);
 349
 350         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
 351
 352         return 0;
 353
 354 nla_put_failure:
 355         genlmsg_cancel(msg, hdr);
 356 free_msg:
 357         nlmsg_free(msg);
 358         return -EMSGSIZE;
 359 }
 360
 361 int nfc_genl_llc_send_sdres(struct nfc_dev *dev, struct hlist_head *sdres_list)
 362 {
 363         struct sk_buff *msg;
 364         struct nlattr *sdp_attr, *uri_attr;
 365         struct nfc_llcp_sdp_tlv *sdres;
 366         struct hlist_node *n;
 367         void *hdr;
 368         int rc = -EMSGSIZE;
 369         int i;
 370
 371         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 372         if (!msg)
 373                 return -ENOMEM;
 374
 375         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 376                           NFC_EVENT_LLC_SDRES);
 377         if (!hdr)
 378                 goto free_msg;
 379
 380         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 381                 goto nla_put_failure;
 382
 383         sdp_attr = nla_nest_start(msg, NFC_ATTR_LLC_SDP);
 384         if (sdp_attr == NULL) {
 385                 rc = -ENOMEM;
 386                 goto nla_put_failure;
 387         }
 388
 389         i = 1;
 390         hlist_for_each_entry_safe(sdres, n, sdres_list, node) {
 391                 pr_debug("uri: %s, sap: %d\n", sdres->uri, sdres->sap);
 392
 393                 uri_attr = nla_nest_start(msg, i++);
 394                 if (uri_attr == NULL) {
 395                         rc = -ENOMEM;
 396                         goto nla_put_failure;
 397                 }
 398
 399                 if (nla_put_u8(msg, NFC_SDP_ATTR_SAP, sdres->sap))
 400                         goto nla_put_failure;
 401
 402                 if (nla_put_string(msg, NFC_SDP_ATTR_URI, sdres->uri))
 403                         goto nla_put_failure;
 404
 405                 nla_nest_end(msg, uri_attr);
 406
 407                 hlist_del(&sdres->node);
 408
 409                 nfc_llcp_free_sdp_tlv(sdres);
 410         }
 411
 412         nla_nest_end(msg, sdp_attr);
 413
 414         genlmsg_end(msg, hdr);
 415
 416         return genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
 417
 418 nla_put_failure:
 419         genlmsg_cancel(msg, hdr);
 420
 421 free_msg:
 422         nlmsg_free(msg);
 423
 424         nfc_llcp_free_sdp_tlv_list(sdres_list);
 425
 426         return rc;
 427 }
 428
 429 int nfc_genl_se_added(struct nfc_dev *dev, u32 se_idx, u16 type)
 430 {
 431         struct sk_buff *msg;
 432         void *hdr;
 433
 434         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 435         if (!msg)
 436                 return -ENOMEM;
 437
 438         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 439                           NFC_EVENT_SE_ADDED);
 440         if (!hdr)
 441                 goto free_msg;
 442
 443         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
 444             nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
 445             nla_put_u8(msg, NFC_ATTR_SE_TYPE, type))
 446                 goto nla_put_failure;
 447
 448         genlmsg_end(msg, hdr);
 449
 450         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
 451
 452         return 0;
 453
 454 nla_put_failure:
 455         genlmsg_cancel(msg, hdr);
 456 free_msg:
 457         nlmsg_free(msg);
 458         return -EMSGSIZE;
 459 }
 460
 461 int nfc_genl_se_removed(struct nfc_dev *dev, u32 se_idx)
 462 {
 463         struct sk_buff *msg;
 464         void *hdr;
 465
 466         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 467         if (!msg)
 468                 return -ENOMEM;
 469
 470         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 471                           NFC_EVENT_SE_REMOVED);
 472         if (!hdr)
 473                 goto free_msg;
 474
 475         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
 476             nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx))
 477                 goto nla_put_failure;
 478
 479         genlmsg_end(msg, hdr);
 480
 481         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
 482
 483         return 0;
 484
 485 nla_put_failure:
 486         genlmsg_cancel(msg, hdr);
 487 free_msg:
 488         nlmsg_free(msg);
 489         return -EMSGSIZE;
 490 }
 491
 492 static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
 493                                 u32 portid, u32 seq,
 494                                 struct netlink_callback *cb,
 495                                 int flags)
 496 {
 497         void *hdr;
 498
 499         hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
 500                           NFC_CMD_GET_DEVICE);
 501         if (!hdr)
 502                 return -EMSGSIZE;
 503
 504         if (cb)
 505                 genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
 506
 507         if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
 508             nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
 509             nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) ||
 510             nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up) ||
 511             nla_put_u8(msg, NFC_ATTR_RF_MODE, dev->rf_mode))
 512                 goto nla_put_failure;
 513
 514         return genlmsg_end(msg, hdr);
 515
 516 nla_put_failure:
 517         genlmsg_cancel(msg, hdr);
 518         return -EMSGSIZE;
 519 }
 520
 521 static int nfc_genl_dump_devices(struct sk_buff *skb,
 522                                  struct netlink_callback *cb)
 523 {
 524         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
 525         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 526         bool first_call = false;
 527
 528         if (!iter) {
 529                 first_call = true;
 530                 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
 531                 if (!iter)
 532                         return -ENOMEM;
 533                 cb->args[0] = (long) iter;
 534         }
 535
 536         mutex_lock(&nfc_devlist_mutex);
 537
 538         cb->seq = nfc_devlist_generation;
 539
 540         if (first_call) {
 541                 nfc_device_iter_init(iter);
 542                 dev = nfc_device_iter_next(iter);
 543         }
 544
 545         while (dev) {
 546                 int rc;
 547
 548                 rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).portid,
 549                                           cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
 550                 if (rc < 0)
 551                         break;
 552
 553                 dev = nfc_device_iter_next(iter);
 554         }
 555
 556         mutex_unlock(&nfc_devlist_mutex);
 557
 558         cb->args[1] = (long) dev;
 559
 560         return skb->len;
 561 }
 562
 563 static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
 564 {
 565         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
 566
 567         nfc_device_iter_exit(iter);
 568         kfree(iter);
 569
 570         return 0;
 571 }
 572
 573 int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
 574                                u8 comm_mode, u8 rf_mode)
 575 {
 576         struct sk_buff *msg;
 577         void *hdr;
 578
 579         pr_debug("DEP link is up\n");
 580
 581         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 582         if (!msg)
 583                 return -ENOMEM;
 584
 585         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP);
 586         if (!hdr)
 587                 goto free_msg;
 588
 589         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 590                 goto nla_put_failure;
 591         if (rf_mode == NFC_RF_INITIATOR &&
 592             nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
 593                 goto nla_put_failure;
 594         if (nla_put_u8(msg, NFC_ATTR_COMM_MODE, comm_mode) ||
 595             nla_put_u8(msg, NFC_ATTR_RF_MODE, rf_mode))
 596                 goto nla_put_failure;
 597
 598         genlmsg_end(msg, hdr);
 599
 600         dev->dep_link_up = true;
 601
 602         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
 603
 604         return 0;
 605
 606 nla_put_failure:
 607         genlmsg_cancel(msg, hdr);
 608 free_msg:
 609         nlmsg_free(msg);
 610         return -EMSGSIZE;
 611 }
 612
 613 int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
 614 {
 615         struct sk_buff *msg;
 616         void *hdr;
 617
 618         pr_debug("DEP link is down\n");
 619
 620         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 621         if (!msg)
 622                 return -ENOMEM;
 623
 624         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 625                           NFC_CMD_DEP_LINK_DOWN);
 626         if (!hdr)
 627                 goto free_msg;
 628
 629         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 630                 goto nla_put_failure;
 631
 632         genlmsg_end(msg, hdr);
 633
 634         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
 635
 636         return 0;
 637
 638 nla_put_failure:
 639         genlmsg_cancel(msg, hdr);
 640 free_msg:
 641         nlmsg_free(msg);
 642         return -EMSGSIZE;
 643 }
 644
 645 static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
 646 {
 647         struct sk_buff *msg;
 648         struct nfc_dev *dev;
 649         u32 idx;
 650         int rc = -ENOBUFS;
 651
 652         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 653                 return -EINVAL;
 654
 655         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 656
 657         dev = nfc_get_device(idx);
 658         if (!dev)
 659                 return -ENODEV;
 660
 661         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 662         if (!msg) {
 663                 rc = -ENOMEM;
 664                 goto out_putdev;
 665         }
 666
 667         rc = nfc_genl_send_device(msg, dev, info->snd_portid, info->snd_seq,
 668                                   NULL, 0);
 669         if (rc < 0)
 670                 goto out_free;
 671
 672         nfc_put_device(dev);
 673
 674         return genlmsg_reply(msg, info);
 675
 676 out_free:
 677         nlmsg_free(msg);
 678 out_putdev:
 679         nfc_put_device(dev);
 680         return rc;
 681 }
 682
 683 static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info)
 684 {
 685         struct nfc_dev *dev;
 686         int rc;
 687         u32 idx;
 688
 689         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 690                 return -EINVAL;
 691
 692         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 693
 694         dev = nfc_get_device(idx);
 695         if (!dev)
 696                 return -ENODEV;
 697
 698         rc = nfc_dev_up(dev);
 699
 700         nfc_put_device(dev);
 701         return rc;
 702 }
 703
 704 static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info)
 705 {
 706         struct nfc_dev *dev;
 707         int rc;
 708         u32 idx;
 709
 710         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 711                 return -EINVAL;
 712
 713         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 714
 715         dev = nfc_get_device(idx);
 716         if (!dev)
 717                 return -ENODEV;
 718
 719         rc = nfc_dev_down(dev);
 720
 721         nfc_put_device(dev);
 722         return rc;
 723 }
 724
 725 static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
 726 {
 727         struct nfc_dev *dev;
 728         int rc;
 729         u32 idx;
 730         u32 im_protocols = 0, tm_protocols = 0;
 731
 732         pr_debug("Poll start\n");
 733
 734         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 735             ((!info->attrs[NFC_ATTR_IM_PROTOCOLS] &&
 736               !info->attrs[NFC_ATTR_PROTOCOLS]) &&
 737               !info->attrs[NFC_ATTR_TM_PROTOCOLS]))
 738                 return -EINVAL;
 739
 740         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 741
 742         if (info->attrs[NFC_ATTR_TM_PROTOCOLS])
 743                 tm_protocols = nla_get_u32(info->attrs[NFC_ATTR_TM_PROTOCOLS]);
 744
 745         if (info->attrs[NFC_ATTR_IM_PROTOCOLS])
 746                 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_IM_PROTOCOLS]);
 747         else if (info->attrs[NFC_ATTR_PROTOCOLS])
 748                 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
 749
 750         dev = nfc_get_device(idx);
 751         if (!dev)
 752                 return -ENODEV;
 753
 754         mutex_lock(&dev->genl_data.genl_data_mutex);
 755
 756         rc = nfc_start_poll(dev, im_protocols, tm_protocols);
 757         if (!rc)
 758                 dev->genl_data.poll_req_portid = info->snd_portid;
 759
 760         mutex_unlock(&dev->genl_data.genl_data_mutex);
 761
 762         nfc_put_device(dev);
 763         return rc;
 764 }
 765
 766 static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
 767 {
 768         struct nfc_dev *dev;
 769         int rc;
 770         u32 idx;
 771
 772         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 773                 return -EINVAL;
 774
 775         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 776
 777         dev = nfc_get_device(idx);
 778         if (!dev)
 779                 return -ENODEV;
 780
 781         device_lock(&dev->dev);
 782
 783         if (!dev->polling) {
 784                 device_unlock(&dev->dev);
 785                 return -EINVAL;
 786         }
 787
 788         device_unlock(&dev->dev);
 789
 790         mutex_lock(&dev->genl_data.genl_data_mutex);
 791
 792         if (dev->genl_data.poll_req_portid != info->snd_portid) {
 793                 rc = -EBUSY;
 794                 goto out;
 795         }
 796
 797         rc = nfc_stop_poll(dev);
 798         dev->genl_data.poll_req_portid = 0;
 799
 800 out:
 801         mutex_unlock(&dev->genl_data.genl_data_mutex);
 802         nfc_put_device(dev);
 803         return rc;
 804 }
 805
 806 static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
 807 {
 808         struct nfc_dev *dev;
 809         int rc, tgt_idx;
 810         u32 idx;
 811         u8 comm;
 812
 813         pr_debug("DEP link up\n");
 814
 815         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 816             !info->attrs[NFC_ATTR_COMM_MODE])
 817                 return -EINVAL;
 818
 819         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 820         if (!info->attrs[NFC_ATTR_TARGET_INDEX])
 821                 tgt_idx = NFC_TARGET_IDX_ANY;
 822         else
 823                 tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
 824
 825         comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
 826
 827         if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
 828                 return -EINVAL;
 829
 830         dev = nfc_get_device(idx);
 831         if (!dev)
 832                 return -ENODEV;
 833
 834         rc = nfc_dep_link_up(dev, tgt_idx, comm);
 835
 836         nfc_put_device(dev);
 837
 838         return rc;
 839 }
 840
 841 static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
 842 {
 843         struct nfc_dev *dev;
 844         int rc;
 845         u32 idx;
 846
 847         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 848                 return -EINVAL;
 849
 850         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 851
 852         dev = nfc_get_device(idx);
 853         if (!dev)
 854                 return -ENODEV;
 855
 856         rc = nfc_dep_link_down(dev);
 857
 858         nfc_put_device(dev);
 859         return rc;
 860 }
 861
 862 static int nfc_genl_send_params(struct sk_buff *msg,
 863                                 struct nfc_llcp_local *local,
 864                                 u32 portid, u32 seq)
 865 {
 866         void *hdr;
 867
 868         hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, 0,
 869                           NFC_CMD_LLC_GET_PARAMS);
 870         if (!hdr)
 871                 return -EMSGSIZE;
 872
 873         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, local->dev->idx) ||
 874             nla_put_u8(msg, NFC_ATTR_LLC_PARAM_LTO, local->lto) ||
 875             nla_put_u8(msg, NFC_ATTR_LLC_PARAM_RW, local->rw) ||
 876             nla_put_u16(msg, NFC_ATTR_LLC_PARAM_MIUX, be16_to_cpu(local->miux)))
 877                 goto nla_put_failure;
 878
 879         return genlmsg_end(msg, hdr);
 880
 881 nla_put_failure:
 882
 883         genlmsg_cancel(msg, hdr);
 884         return -EMSGSIZE;
 885 }
 886
 887 static int nfc_genl_llc_get_params(struct sk_buff *skb, struct genl_info *info)
 888 {
 889         struct nfc_dev *dev;
 890         struct nfc_llcp_local *local;
 891         int rc = 0;
 892         struct sk_buff *msg = NULL;
 893         u32 idx;
 894
 895         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 896                 return -EINVAL;
 897
 898         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 899
 900         dev = nfc_get_device(idx);
 901         if (!dev)
 902                 return -ENODEV;
 903
 904         device_lock(&dev->dev);
 905
 906         local = nfc_llcp_find_local(dev);
 907         if (!local) {
 908                 rc = -ENODEV;
 909                 goto exit;
 910         }
 911
 912         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 913         if (!msg) {
 914                 rc = -ENOMEM;
 915                 goto exit;
 916         }
 917
 918         rc = nfc_genl_send_params(msg, local, info->snd_portid, info->snd_seq);
 919
 920 exit:
 921         device_unlock(&dev->dev);
 922
 923         nfc_put_device(dev);
 924
 925         if (rc < 0) {
 926                 if (msg)
 927                         nlmsg_free(msg);
 928
 929                 return rc;
 930         }
 931
 932         return genlmsg_reply(msg, info);
 933 }
 934
 935 static int nfc_genl_llc_set_params(struct sk_buff *skb, struct genl_info *info)
 936 {
 937         struct nfc_dev *dev;
 938         struct nfc_llcp_local *local;
 939         u8 rw = 0;
 940         u16 miux = 0;
 941         u32 idx;
 942         int rc = 0;
 943
 944         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 945             (!info->attrs[NFC_ATTR_LLC_PARAM_LTO] &&
 946              !info->attrs[NFC_ATTR_LLC_PARAM_RW] &&
 947              !info->attrs[NFC_ATTR_LLC_PARAM_MIUX]))
 948                 return -EINVAL;
 949
 950         if (info->attrs[NFC_ATTR_LLC_PARAM_RW]) {
 951                 rw = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_RW]);
 952
 953                 if (rw > LLCP_MAX_RW)
 954                         return -EINVAL;
 955         }
 956
 957         if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX]) {
 958                 miux = nla_get_u16(info->attrs[NFC_ATTR_LLC_PARAM_MIUX]);
 959
 960                 if (miux > LLCP_MAX_MIUX)
 961                         return -EINVAL;
 962         }
 963
 964         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 965
 966         dev = nfc_get_device(idx);
 967         if (!dev)
 968                 return -ENODEV;
 969
 970         device_lock(&dev->dev);
 971
 972         local = nfc_llcp_find_local(dev);
 973         if (!local) {
 974                 nfc_put_device(dev);
 975                 rc = -ENODEV;
 976                 goto exit;
 977         }
 978
 979         if (info->attrs[NFC_ATTR_LLC_PARAM_LTO]) {
 980                 if (dev->dep_link_up) {
 981                         rc = -EINPROGRESS;
 982                         goto exit;
 983                 }
 984
 985                 local->lto = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_LTO]);
 986         }
 987
 988         if (info->attrs[NFC_ATTR_LLC_PARAM_RW])
 989                 local->rw = rw;
 990
 991         if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX])
 992                 local->miux = cpu_to_be16(miux);
 993
 994 exit:
 995         device_unlock(&dev->dev);
 996
 997         nfc_put_device(dev);
 998
 999         return rc;
1000 }
1001
1002 static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info)
1003 {
1004         struct nfc_dev *dev;
1005         struct nfc_llcp_local *local;
1006         struct nlattr *attr, *sdp_attrs[NFC_SDP_ATTR_MAX+1];
1007         u32 idx;
1008         u8 tid;
1009         char *uri;
1010         int rc = 0, rem;
1011         size_t uri_len, tlvs_len;
1012         struct hlist_head sdreq_list;
1013         struct nfc_llcp_sdp_tlv *sdreq;
1014
1015         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1016             !info->attrs[NFC_ATTR_LLC_SDP])
1017                 return -EINVAL;
1018
1019         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1020
1021         dev = nfc_get_device(idx);
1022         if (!dev) {
1023                 rc = -ENODEV;
1024                 goto exit;
1025         }
1026
1027         device_lock(&dev->dev);
1028
1029         if (dev->dep_link_up == false) {
1030                 rc = -ENOLINK;
1031                 goto exit;
1032         }
1033
1034         local = nfc_llcp_find_local(dev);
1035         if (!local) {
1036                 nfc_put_device(dev);
1037                 rc = -ENODEV;
1038                 goto exit;
1039         }
1040
1041         INIT_HLIST_HEAD(&sdreq_list);
1042
1043         tlvs_len = 0;
1044
1045         nla_for_each_nested(attr, info->attrs[NFC_ATTR_LLC_SDP], rem) {
1046                 rc = nla_parse_nested(sdp_attrs, NFC_SDP_ATTR_MAX, attr,
1047                                       nfc_sdp_genl_policy);
1048
1049                 if (rc != 0) {
1050                         rc = -EINVAL;
1051                         goto exit;
1052                 }
1053
1054                 if (!sdp_attrs[NFC_SDP_ATTR_URI])
1055                         continue;
1056
1057                 uri_len = nla_len(sdp_attrs[NFC_SDP_ATTR_URI]);
1058                 if (uri_len == 0)
1059                         continue;
1060
1061                 uri = nla_data(sdp_attrs[NFC_SDP_ATTR_URI]);
1062                 if (uri == NULL || *uri == 0)
1063                         continue;
1064
1065                 tid = local->sdreq_next_tid++;
1066
1067                 sdreq = nfc_llcp_build_sdreq_tlv(tid, uri, uri_len);
1068                 if (sdreq == NULL) {
1069                         rc = -ENOMEM;
1070                         goto exit;
1071                 }
1072
1073                 tlvs_len += sdreq->tlv_len;
1074
1075                 hlist_add_head(&sdreq->node, &sdreq_list);
1076         }
1077
1078         if (hlist_empty(&sdreq_list)) {
1079                 rc = -EINVAL;
1080                 goto exit;
1081         }
1082
1083         rc = nfc_llcp_send_snl_sdreq(local, &sdreq_list, tlvs_len);
1084 exit:
1085         device_unlock(&dev->dev);
1086
1087         nfc_put_device(dev);
1088
1089         return rc;
1090 }
1091
1092 static int nfc_genl_fw_upload(struct sk_buff *skb, struct genl_info *info)
1093 {
1094         struct nfc_dev *dev;
1095         int rc;
1096         u32 idx;
1097         char firmware_name[NFC_FIRMWARE_NAME_MAXSIZE + 1];
1098
1099         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
1100                 return -EINVAL;
1101
1102         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1103
1104         dev = nfc_get_device(idx);
1105         if (!dev)
1106                 return -ENODEV;
1107
1108         nla_strlcpy(firmware_name, info->attrs[NFC_ATTR_FIRMWARE_NAME],
1109                     sizeof(firmware_name));
1110
1111         rc = nfc_fw_upload(dev, firmware_name);
1112
1113         nfc_put_device(dev);
1114         return rc;
1115 }
1116
1117 int nfc_genl_fw_upload_done(struct nfc_dev *dev, const char *firmware_name)
1118 {
1119         struct sk_buff *msg;
1120         void *hdr;
1121
1122         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1123         if (!msg)
1124                 return -ENOMEM;
1125
1126         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
1127                           NFC_CMD_FW_UPLOAD);
1128         if (!hdr)
1129                 goto free_msg;
1130
1131         if (nla_put_string(msg, NFC_ATTR_FIRMWARE_NAME, firmware_name) ||
1132             nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
1133                 goto nla_put_failure;
1134
1135         genlmsg_end(msg, hdr);
1136
1137         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
1138
1139         return 0;
1140
1141 nla_put_failure:
1142         genlmsg_cancel(msg, hdr);
1143 free_msg:
1144         nlmsg_free(msg);
1145         return -EMSGSIZE;
1146 }
1147
1148 static int nfc_genl_enable_se(struct sk_buff *skb, struct genl_info *info)
1149 {
1150         struct nfc_dev *dev;
1151         int rc;
1152         u32 idx, se_idx;
1153
1154         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1155             !info->attrs[NFC_ATTR_SE_INDEX])
1156                 return -EINVAL;
1157
1158         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1159         se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1160
1161         dev = nfc_get_device(idx);
1162         if (!dev)
1163                 return -ENODEV;
1164
1165         rc = nfc_enable_se(dev, se_idx);
1166
1167         nfc_put_device(dev);
1168         return rc;
1169 }
1170
1171 static int nfc_genl_disable_se(struct sk_buff *skb, struct genl_info *info)
1172 {
1173         struct nfc_dev *dev;
1174         int rc;
1175         u32 idx, se_idx;
1176
1177         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1178             !info->attrs[NFC_ATTR_SE_INDEX])
1179                 return -EINVAL;
1180
1181         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1182         se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1183
1184         dev = nfc_get_device(idx);
1185         if (!dev)
1186                 return -ENODEV;
1187
1188         rc = nfc_disable_se(dev, se_idx);
1189
1190         nfc_put_device(dev);
1191         return rc;
1192 }
1193
1194 static struct genl_ops nfc_genl_ops[] = {
1195         {
1196                 .cmd = NFC_CMD_GET_DEVICE,
1197                 .doit = nfc_genl_get_device,
1198                 .dumpit = nfc_genl_dump_devices,
1199                 .done = nfc_genl_dump_devices_done,
1200                 .policy = nfc_genl_policy,
1201         },
1202         {
1203                 .cmd = NFC_CMD_DEV_UP,
1204                 .doit = nfc_genl_dev_up,
1205                 .policy = nfc_genl_policy,
1206         },
1207         {
1208                 .cmd = NFC_CMD_DEV_DOWN,
1209                 .doit = nfc_genl_dev_down,
1210                 .policy = nfc_genl_policy,
1211         },
1212         {
1213                 .cmd = NFC_CMD_START_POLL,
1214                 .doit = nfc_genl_start_poll,
1215                 .policy = nfc_genl_policy,
1216         },
1217         {
1218                 .cmd = NFC_CMD_STOP_POLL,
1219                 .doit = nfc_genl_stop_poll,
1220                 .policy = nfc_genl_policy,
1221         },
1222         {
1223                 .cmd = NFC_CMD_DEP_LINK_UP,
1224                 .doit = nfc_genl_dep_link_up,
1225                 .policy = nfc_genl_policy,
1226         },
1227         {
1228                 .cmd = NFC_CMD_DEP_LINK_DOWN,
1229                 .doit = nfc_genl_dep_link_down,
1230                 .policy = nfc_genl_policy,
1231         },
1232         {
1233                 .cmd = NFC_CMD_GET_TARGET,
1234                 .dumpit = nfc_genl_dump_targets,
1235                 .done = nfc_genl_dump_targets_done,
1236                 .policy = nfc_genl_policy,
1237         },
1238         {
1239                 .cmd = NFC_CMD_LLC_GET_PARAMS,
1240                 .doit = nfc_genl_llc_get_params,
1241                 .policy = nfc_genl_policy,
1242         },
1243         {
1244                 .cmd = NFC_CMD_LLC_SET_PARAMS,
1245                 .doit = nfc_genl_llc_set_params,
1246                 .policy = nfc_genl_policy,
1247         },
1248         {
1249                 .cmd = NFC_CMD_LLC_SDREQ,
1250                 .doit = nfc_genl_llc_sdreq,
1251                 .policy = nfc_genl_policy,
1252         },
1253         {
1254                 .cmd = NFC_CMD_FW_UPLOAD,
1255                 .doit = nfc_genl_fw_upload,
1256                 .policy = nfc_genl_policy,
1257         },
1258         {
1259                 .cmd = NFC_CMD_ENABLE_SE,
1260                 .doit = nfc_genl_enable_se,
1261                 .policy = nfc_genl_policy,
1262         },
1263         {
1264                 .cmd = NFC_CMD_DISABLE_SE,
1265                 .doit = nfc_genl_disable_se,
1266                 .policy = nfc_genl_policy,
1267         },
1268 };
1269
1270
1271 struct urelease_work {
1272         struct  work_struct w;
1273         int     portid;
1274 };
1275
1276 static void nfc_urelease_event_work(struct work_struct *work)
1277 {
1278         struct urelease_work *w = container_of(work, struct urelease_work, w);
1279         struct class_dev_iter iter;
1280         struct nfc_dev *dev;
1281
1282         pr_debug("portid %d\n", w->portid);
1283
1284         mutex_lock(&nfc_devlist_mutex);
1285
1286         nfc_device_iter_init(&iter);
1287         dev = nfc_device_iter_next(&iter);
1288
1289         while (dev) {
1290                 mutex_lock(&dev->genl_data.genl_data_mutex);
1291
1292                 if (dev->genl_data.poll_req_portid == w->portid) {
1293                         nfc_stop_poll(dev);
1294                         dev->genl_data.poll_req_portid = 0;
1295                 }
1296
1297                 mutex_unlock(&dev->genl_data.genl_data_mutex);
1298
1299                 dev = nfc_device_iter_next(&iter);
1300         }
1301
1302         nfc_device_iter_exit(&iter);
1303
1304         mutex_unlock(&nfc_devlist_mutex);
1305
1306         kfree(w);
1307 }
1308
1309 static int nfc_genl_rcv_nl_event(struct notifier_block *this,
1310                                  unsigned long event, void *ptr)
1311 {
1312         struct netlink_notify *n = ptr;
1313         struct urelease_work *w;
1314
1315         if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
1316                 goto out;
1317
1318         pr_debug("NETLINK_URELEASE event from id %d\n", n->portid);
1319
1320         w = kmalloc(sizeof(*w), GFP_ATOMIC);
1321         if (w) {
1322                 INIT_WORK((struct work_struct *) w, nfc_urelease_event_work);
1323                 w->portid = n->portid;
1324                 schedule_work((struct work_struct *) w);
1325         }
1326
1327 out:
1328         return NOTIFY_DONE;
1329 }
1330
1331 void nfc_genl_data_init(struct nfc_genl_data *genl_data)
1332 {
1333         genl_data->poll_req_portid = 0;
1334         mutex_init(&genl_data->genl_data_mutex);
1335 }
1336
1337 void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
1338 {
1339         mutex_destroy(&genl_data->genl_data_mutex);
1340 }
1341
1342 static struct notifier_block nl_notifier = {
1343         .notifier_call  = nfc_genl_rcv_nl_event,
1344 };
1345
1346 /**
1347  * nfc_genl_init() - Initialize netlink interface
1348  *
1349  * This initialization function registers the nfc netlink family.
1350  */
1351 int __init nfc_genl_init(void)
1352 {
1353         int rc;
1354
1355         rc = genl_register_family_with_ops(&nfc_genl_family, nfc_genl_ops,
1356                                            ARRAY_SIZE(nfc_genl_ops));
1357         if (rc)
1358                 return rc;
1359
1360         rc = genl_register_mc_group(&nfc_genl_family, &nfc_genl_event_mcgrp);
1361
1362         netlink_register_notifier(&nl_notifier);
1363
1364         return rc;
1365 }
1366
1367 /**
1368  * nfc_genl_exit() - Deinitialize netlink interface
1369  *
1370  * This exit function unregisters the nfc netlink family.
1371  */
1372 void nfc_genl_exit(void)
1373 {
1374         netlink_unregister_notifier(&nl_notifier);
1375         genl_unregister_family(&nfc_genl_family);
1376 }