core.c revision be9ae4ce4ee66e211815122ab4f41913efed4fec
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 <linux/init.h> 27#include <linux/kernel.h> 28#include <linux/module.h> 29#include <linux/slab.h> 30#include <linux/nfc.h> 31 32#include "nfc.h" 33 34#define VERSION "0.1" 35 36#define NFC_CHECK_PRES_FREQ_MS 2000 37 38int nfc_devlist_generation; 39DEFINE_MUTEX(nfc_devlist_mutex); 40 41/** 42 * nfc_dev_up - turn on the NFC device 43 * 44 * @dev: The nfc device to be turned on 45 * 46 * The device remains up until the nfc_dev_down function is called. 47 */ 48int nfc_dev_up(struct nfc_dev *dev) 49{ 50 int rc = 0; 51 52 pr_debug("dev_name=%s\n", dev_name(&dev->dev)); 53 54 device_lock(&dev->dev); 55 56 if (!device_is_registered(&dev->dev)) { 57 rc = -ENODEV; 58 goto error; 59 } 60 61 if (dev->dev_up) { 62 rc = -EALREADY; 63 goto error; 64 } 65 66 if (dev->ops->dev_up) 67 rc = dev->ops->dev_up(dev); 68 69 if (!rc) 70 dev->dev_up = true; 71 72error: 73 device_unlock(&dev->dev); 74 return rc; 75} 76 77/** 78 * nfc_dev_down - turn off the NFC device 79 * 80 * @dev: The nfc device to be turned off 81 */ 82int nfc_dev_down(struct nfc_dev *dev) 83{ 84 int rc = 0; 85 86 pr_debug("dev_name=%s\n", dev_name(&dev->dev)); 87 88 device_lock(&dev->dev); 89 90 if (!device_is_registered(&dev->dev)) { 91 rc = -ENODEV; 92 goto error; 93 } 94 95 if (!dev->dev_up) { 96 rc = -EALREADY; 97 goto error; 98 } 99 100 if (dev->polling || dev->active_target) { 101 rc = -EBUSY; 102 goto error; 103 } 104 105 if (dev->ops->dev_down) 106 dev->ops->dev_down(dev); 107 108 dev->dev_up = false; 109 110error: 111 device_unlock(&dev->dev); 112 return rc; 113} 114 115/** 116 * nfc_start_poll - start polling for nfc targets 117 * 118 * @dev: The nfc device that must start polling 119 * @protocols: bitset of nfc protocols that must be used for polling 120 * 121 * The device remains polling for targets until a target is found or 122 * the nfc_stop_poll function is called. 123 */ 124int nfc_start_poll(struct nfc_dev *dev, u32 im_protocols, u32 tm_protocols) 125{ 126 int rc; 127 128 pr_debug("dev_name %s initiator protocols 0x%x target protocols 0x%x\n", 129 dev_name(&dev->dev), im_protocols, tm_protocols); 130 131 if (!im_protocols && !tm_protocols) 132 return -EINVAL; 133 134 device_lock(&dev->dev); 135 136 if (!device_is_registered(&dev->dev)) { 137 rc = -ENODEV; 138 goto error; 139 } 140 141 if (dev->polling) { 142 rc = -EBUSY; 143 goto error; 144 } 145 146 rc = dev->ops->start_poll(dev, im_protocols, tm_protocols); 147 if (!rc) { 148 dev->polling = true; 149 dev->rf_mode = NFC_RF_NONE; 150 } 151 152error: 153 device_unlock(&dev->dev); 154 return rc; 155} 156 157/** 158 * nfc_stop_poll - stop polling for nfc targets 159 * 160 * @dev: The nfc device that must stop polling 161 */ 162int nfc_stop_poll(struct nfc_dev *dev) 163{ 164 int rc = 0; 165 166 pr_debug("dev_name=%s\n", dev_name(&dev->dev)); 167 168 device_lock(&dev->dev); 169 170 if (!device_is_registered(&dev->dev)) { 171 rc = -ENODEV; 172 goto error; 173 } 174 175 if (!dev->polling) { 176 rc = -EINVAL; 177 goto error; 178 } 179 180 dev->ops->stop_poll(dev); 181 dev->polling = false; 182 183error: 184 device_unlock(&dev->dev); 185 return rc; 186} 187 188static struct nfc_target *nfc_find_target(struct nfc_dev *dev, u32 target_idx) 189{ 190 int i; 191 192 if (dev->n_targets == 0) 193 return NULL; 194 195 for (i = 0; i < dev->n_targets ; i++) { 196 if (dev->targets[i].idx == target_idx) 197 return &dev->targets[i]; 198 } 199 200 return NULL; 201} 202 203int nfc_dep_link_up(struct nfc_dev *dev, int target_index, u8 comm_mode) 204{ 205 int rc = 0; 206 u8 *gb; 207 size_t gb_len; 208 struct nfc_target *target; 209 210 pr_debug("dev_name=%s comm %d\n", dev_name(&dev->dev), comm_mode); 211 212 if (!dev->ops->dep_link_up) 213 return -EOPNOTSUPP; 214 215 device_lock(&dev->dev); 216 217 if (!device_is_registered(&dev->dev)) { 218 rc = -ENODEV; 219 goto error; 220 } 221 222 if (dev->dep_link_up == true) { 223 rc = -EALREADY; 224 goto error; 225 } 226 227 gb = nfc_llcp_general_bytes(dev, &gb_len); 228 if (gb_len > NFC_MAX_GT_LEN) { 229 rc = -EINVAL; 230 goto error; 231 } 232 233 target = nfc_find_target(dev, target_index); 234 if (target == NULL) { 235 rc = -ENOTCONN; 236 goto error; 237 } 238 239 rc = dev->ops->dep_link_up(dev, target, comm_mode, gb, gb_len); 240 if (!rc) { 241 dev->active_target = target; 242 dev->rf_mode = NFC_RF_INITIATOR; 243 } 244 245error: 246 device_unlock(&dev->dev); 247 return rc; 248} 249 250int nfc_dep_link_down(struct nfc_dev *dev) 251{ 252 int rc = 0; 253 254 pr_debug("dev_name=%s\n", dev_name(&dev->dev)); 255 256 if (!dev->ops->dep_link_down) 257 return -EOPNOTSUPP; 258 259 device_lock(&dev->dev); 260 261 if (!device_is_registered(&dev->dev)) { 262 rc = -ENODEV; 263 goto error; 264 } 265 266 if (dev->dep_link_up == false) { 267 rc = -EALREADY; 268 goto error; 269 } 270 271 if (dev->rf_mode == NFC_RF_TARGET) { 272 rc = -EOPNOTSUPP; 273 goto error; 274 } 275 276 rc = dev->ops->dep_link_down(dev); 277 if (!rc) { 278 dev->dep_link_up = false; 279 dev->active_target = NULL; 280 nfc_llcp_mac_is_down(dev); 281 nfc_genl_dep_link_down_event(dev); 282 } 283 284error: 285 device_unlock(&dev->dev); 286 return rc; 287} 288 289int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx, 290 u8 comm_mode, u8 rf_mode) 291{ 292 dev->dep_link_up = true; 293 294 nfc_llcp_mac_is_up(dev, target_idx, comm_mode, rf_mode); 295 296 return nfc_genl_dep_link_up_event(dev, target_idx, comm_mode, rf_mode); 297} 298EXPORT_SYMBOL(nfc_dep_link_is_up); 299 300/** 301 * nfc_activate_target - prepare the target for data exchange 302 * 303 * @dev: The nfc device that found the target 304 * @target_idx: index of the target that must be activated 305 * @protocol: nfc protocol that will be used for data exchange 306 */ 307int nfc_activate_target(struct nfc_dev *dev, u32 target_idx, u32 protocol) 308{ 309 int rc; 310 struct nfc_target *target; 311 312 pr_debug("dev_name=%s target_idx=%u protocol=%u\n", 313 dev_name(&dev->dev), target_idx, protocol); 314 315 device_lock(&dev->dev); 316 317 if (!device_is_registered(&dev->dev)) { 318 rc = -ENODEV; 319 goto error; 320 } 321 322 if (dev->active_target) { 323 rc = -EBUSY; 324 goto error; 325 } 326 327 target = nfc_find_target(dev, target_idx); 328 if (target == NULL) { 329 rc = -ENOTCONN; 330 goto error; 331 } 332 333 rc = dev->ops->activate_target(dev, target, protocol); 334 if (!rc) { 335 dev->active_target = target; 336 dev->rf_mode = NFC_RF_INITIATOR; 337 338 if (dev->ops->check_presence) 339 mod_timer(&dev->check_pres_timer, jiffies + 340 msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS)); 341 } 342 343error: 344 device_unlock(&dev->dev); 345 return rc; 346} 347 348/** 349 * nfc_deactivate_target - deactivate a nfc target 350 * 351 * @dev: The nfc device that found the target 352 * @target_idx: index of the target that must be deactivated 353 */ 354int nfc_deactivate_target(struct nfc_dev *dev, u32 target_idx) 355{ 356 int rc = 0; 357 358 pr_debug("dev_name=%s target_idx=%u\n", 359 dev_name(&dev->dev), target_idx); 360 361 device_lock(&dev->dev); 362 363 if (!device_is_registered(&dev->dev)) { 364 rc = -ENODEV; 365 goto error; 366 } 367 368 if (dev->active_target == NULL) { 369 rc = -ENOTCONN; 370 goto error; 371 } 372 373 if (dev->active_target->idx != target_idx) { 374 rc = -ENOTCONN; 375 goto error; 376 } 377 378 if (dev->ops->check_presence) 379 del_timer_sync(&dev->check_pres_timer); 380 381 dev->ops->deactivate_target(dev, dev->active_target); 382 dev->active_target = NULL; 383 384error: 385 device_unlock(&dev->dev); 386 return rc; 387} 388 389/** 390 * nfc_data_exchange - transceive data 391 * 392 * @dev: The nfc device that found the target 393 * @target_idx: index of the target 394 * @skb: data to be sent 395 * @cb: callback called when the response is received 396 * @cb_context: parameter for the callback function 397 * 398 * The user must wait for the callback before calling this function again. 399 */ 400int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx, struct sk_buff *skb, 401 data_exchange_cb_t cb, void *cb_context) 402{ 403 int rc; 404 405 pr_debug("dev_name=%s target_idx=%u skb->len=%u\n", 406 dev_name(&dev->dev), target_idx, skb->len); 407 408 device_lock(&dev->dev); 409 410 if (!device_is_registered(&dev->dev)) { 411 rc = -ENODEV; 412 kfree_skb(skb); 413 goto error; 414 } 415 416 if (dev->rf_mode == NFC_RF_INITIATOR && dev->active_target != NULL) { 417 if (dev->active_target->idx != target_idx) { 418 rc = -EADDRNOTAVAIL; 419 kfree_skb(skb); 420 goto error; 421 } 422 423 if (dev->ops->check_presence) 424 del_timer_sync(&dev->check_pres_timer); 425 426 rc = dev->ops->im_transceive(dev, dev->active_target, skb, cb, 427 cb_context); 428 429 if (!rc && dev->ops->check_presence) 430 mod_timer(&dev->check_pres_timer, jiffies + 431 msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS)); 432 } else if (dev->rf_mode == NFC_RF_TARGET && dev->ops->tm_send != NULL) { 433 rc = dev->ops->tm_send(dev, skb); 434 } else { 435 rc = -ENOTCONN; 436 kfree_skb(skb); 437 goto error; 438 } 439 440 441error: 442 device_unlock(&dev->dev); 443 return rc; 444} 445 446int nfc_set_remote_general_bytes(struct nfc_dev *dev, u8 *gb, u8 gb_len) 447{ 448 pr_debug("dev_name=%s gb_len=%d\n", dev_name(&dev->dev), gb_len); 449 450 if (gb_len > NFC_MAX_GT_LEN) 451 return -EINVAL; 452 453 return nfc_llcp_set_remote_gb(dev, gb, gb_len); 454} 455EXPORT_SYMBOL(nfc_set_remote_general_bytes); 456 457u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len) 458{ 459 pr_debug("dev_name=%s\n", dev_name(&dev->dev)); 460 461 return nfc_llcp_general_bytes(dev, gb_len); 462} 463EXPORT_SYMBOL(nfc_get_local_general_bytes); 464 465int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode, 466 u8 *gb, size_t gb_len) 467{ 468 int rc; 469 470 device_lock(&dev->dev); 471 472 dev->polling = false; 473 474 if (gb != NULL) { 475 rc = nfc_set_remote_general_bytes(dev, gb, gb_len); 476 if (rc < 0) 477 goto out; 478 } 479 480 dev->rf_mode = NFC_RF_TARGET; 481 482 if (protocol == NFC_PROTO_NFC_DEP_MASK) 483 nfc_dep_link_is_up(dev, 0, comm_mode, NFC_RF_TARGET); 484 485 rc = nfc_genl_tm_activated(dev, protocol); 486 487out: 488 device_unlock(&dev->dev); 489 490 return rc; 491} 492EXPORT_SYMBOL(nfc_tm_activated); 493 494int nfc_tm_deactivated(struct nfc_dev *dev) 495{ 496 dev->dep_link_up = false; 497 498 return nfc_genl_tm_deactivated(dev); 499} 500EXPORT_SYMBOL(nfc_tm_deactivated); 501 502/** 503 * nfc_alloc_send_skb - allocate a skb for data exchange responses 504 * 505 * @size: size to allocate 506 * @gfp: gfp flags 507 */ 508struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk, 509 unsigned int flags, unsigned int size, 510 unsigned int *err) 511{ 512 struct sk_buff *skb; 513 unsigned int total_size; 514 515 total_size = size + 516 dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; 517 518 skb = sock_alloc_send_skb(sk, total_size, flags & MSG_DONTWAIT, err); 519 if (skb) 520 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); 521 522 return skb; 523} 524 525/** 526 * nfc_alloc_recv_skb - allocate a skb for data exchange responses 527 * 528 * @size: size to allocate 529 * @gfp: gfp flags 530 */ 531struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp) 532{ 533 struct sk_buff *skb; 534 unsigned int total_size; 535 536 total_size = size + 1; 537 skb = alloc_skb(total_size, gfp); 538 539 if (skb) 540 skb_reserve(skb, 1); 541 542 return skb; 543} 544EXPORT_SYMBOL(nfc_alloc_recv_skb); 545 546/** 547 * nfc_targets_found - inform that targets were found 548 * 549 * @dev: The nfc device that found the targets 550 * @targets: array of nfc targets found 551 * @ntargets: targets array size 552 * 553 * The device driver must call this function when one or many nfc targets 554 * are found. After calling this function, the device driver must stop 555 * polling for targets. 556 * IMPORTANT: this function must not be called from an atomic context. 557 * In addition, it must also not be called from a context that would prevent 558 * the NFC Core to call other nfc ops entry point concurrently. 559 */ 560int nfc_targets_found(struct nfc_dev *dev, 561 struct nfc_target *targets, int n_targets) 562{ 563 int i; 564 565 pr_debug("dev_name=%s n_targets=%d\n", dev_name(&dev->dev), n_targets); 566 567 dev->polling = false; 568 569 for (i = 0; i < n_targets; i++) 570 targets[i].idx = dev->target_next_idx++; 571 572 device_lock(&dev->dev); 573 574 dev->targets_generation++; 575 576 kfree(dev->targets); 577 dev->targets = kmemdup(targets, n_targets * sizeof(struct nfc_target), 578 GFP_ATOMIC); 579 580 if (!dev->targets) { 581 dev->n_targets = 0; 582 device_unlock(&dev->dev); 583 return -ENOMEM; 584 } 585 586 dev->n_targets = n_targets; 587 device_unlock(&dev->dev); 588 589 nfc_genl_targets_found(dev); 590 591 return 0; 592} 593EXPORT_SYMBOL(nfc_targets_found); 594 595/** 596 * nfc_target_lost - inform that an activated target went out of field 597 * 598 * @dev: The nfc device that had the activated target in field 599 * @target_idx: the nfc index of the target 600 * 601 * The device driver must call this function when the activated target 602 * goes out of the field. 603 * IMPORTANT: this function must not be called from an atomic context. 604 * In addition, it must also not be called from a context that would prevent 605 * the NFC Core to call other nfc ops entry point concurrently. 606 */ 607int nfc_target_lost(struct nfc_dev *dev, u32 target_idx) 608{ 609 struct nfc_target *tg; 610 int i; 611 612 pr_debug("dev_name %s n_target %d\n", dev_name(&dev->dev), target_idx); 613 614 device_lock(&dev->dev); 615 616 for (i = 0; i < dev->n_targets; i++) { 617 tg = &dev->targets[i]; 618 if (tg->idx == target_idx) 619 break; 620 } 621 622 if (i == dev->n_targets) { 623 device_unlock(&dev->dev); 624 return -EINVAL; 625 } 626 627 dev->targets_generation++; 628 dev->n_targets--; 629 dev->active_target = NULL; 630 631 if (dev->n_targets) { 632 memcpy(&dev->targets[i], &dev->targets[i + 1], 633 (dev->n_targets - i) * sizeof(struct nfc_target)); 634 } else { 635 kfree(dev->targets); 636 dev->targets = NULL; 637 } 638 639 device_unlock(&dev->dev); 640 641 nfc_genl_target_lost(dev, target_idx); 642 643 return 0; 644} 645EXPORT_SYMBOL(nfc_target_lost); 646 647static void nfc_release(struct device *d) 648{ 649 struct nfc_dev *dev = to_nfc_dev(d); 650 651 pr_debug("dev_name=%s\n", dev_name(&dev->dev)); 652 653 if (dev->ops->check_presence) { 654 del_timer_sync(&dev->check_pres_timer); 655 destroy_workqueue(dev->check_pres_wq); 656 } 657 658 nfc_genl_data_exit(&dev->genl_data); 659 kfree(dev->targets); 660 kfree(dev); 661} 662 663static void nfc_check_pres_work(struct work_struct *work) 664{ 665 struct nfc_dev *dev = container_of(work, struct nfc_dev, 666 check_pres_work); 667 int rc; 668 669 device_lock(&dev->dev); 670 671 if (dev->active_target && timer_pending(&dev->check_pres_timer) == 0) { 672 rc = dev->ops->check_presence(dev, dev->active_target); 673 if (!rc) { 674 mod_timer(&dev->check_pres_timer, jiffies + 675 msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS)); 676 } else { 677 u32 active_target_idx = dev->active_target->idx; 678 device_unlock(&dev->dev); 679 nfc_target_lost(dev, active_target_idx); 680 return; 681 } 682 } 683 684 device_unlock(&dev->dev); 685} 686 687static void nfc_check_pres_timeout(unsigned long data) 688{ 689 struct nfc_dev *dev = (struct nfc_dev *)data; 690 691 queue_work(dev->check_pres_wq, &dev->check_pres_work); 692} 693 694struct class nfc_class = { 695 .name = "nfc", 696 .dev_release = nfc_release, 697}; 698EXPORT_SYMBOL(nfc_class); 699 700static int match_idx(struct device *d, void *data) 701{ 702 struct nfc_dev *dev = to_nfc_dev(d); 703 unsigned int *idx = data; 704 705 return dev->idx == *idx; 706} 707 708struct nfc_dev *nfc_get_device(unsigned int idx) 709{ 710 struct device *d; 711 712 d = class_find_device(&nfc_class, NULL, &idx, match_idx); 713 if (!d) 714 return NULL; 715 716 return to_nfc_dev(d); 717} 718 719/** 720 * nfc_allocate_device - allocate a new nfc device 721 * 722 * @ops: device operations 723 * @supported_protocols: NFC protocols supported by the device 724 */ 725struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops, 726 u32 supported_protocols, 727 int tx_headroom, int tx_tailroom) 728{ 729 static atomic_t dev_no = ATOMIC_INIT(0); 730 struct nfc_dev *dev; 731 732 if (!ops->start_poll || !ops->stop_poll || !ops->activate_target || 733 !ops->deactivate_target || !ops->im_transceive) 734 return NULL; 735 736 if (!supported_protocols) 737 return NULL; 738 739 dev = kzalloc(sizeof(struct nfc_dev), GFP_KERNEL); 740 if (!dev) 741 return NULL; 742 743 dev->dev.class = &nfc_class; 744 dev->idx = atomic_inc_return(&dev_no) - 1; 745 dev_set_name(&dev->dev, "nfc%d", dev->idx); 746 device_initialize(&dev->dev); 747 748 dev->ops = ops; 749 dev->supported_protocols = supported_protocols; 750 dev->tx_headroom = tx_headroom; 751 dev->tx_tailroom = tx_tailroom; 752 753 nfc_genl_data_init(&dev->genl_data); 754 755 756 /* first generation must not be 0 */ 757 dev->targets_generation = 1; 758 759 if (ops->check_presence) { 760 char name[32]; 761 init_timer(&dev->check_pres_timer); 762 dev->check_pres_timer.data = (unsigned long)dev; 763 dev->check_pres_timer.function = nfc_check_pres_timeout; 764 765 INIT_WORK(&dev->check_pres_work, nfc_check_pres_work); 766 snprintf(name, sizeof(name), "nfc%d_check_pres_wq", dev->idx); 767 dev->check_pres_wq = alloc_workqueue(name, WQ_NON_REENTRANT | 768 WQ_UNBOUND | 769 WQ_MEM_RECLAIM, 1); 770 if (dev->check_pres_wq == NULL) { 771 kfree(dev); 772 return NULL; 773 } 774 } 775 776 return dev; 777} 778EXPORT_SYMBOL(nfc_allocate_device); 779 780/** 781 * nfc_register_device - register a nfc device in the nfc subsystem 782 * 783 * @dev: The nfc device to register 784 */ 785int nfc_register_device(struct nfc_dev *dev) 786{ 787 int rc; 788 789 pr_debug("dev_name=%s\n", dev_name(&dev->dev)); 790 791 mutex_lock(&nfc_devlist_mutex); 792 nfc_devlist_generation++; 793 rc = device_add(&dev->dev); 794 mutex_unlock(&nfc_devlist_mutex); 795 796 if (rc < 0) 797 return rc; 798 799 rc = nfc_llcp_register_device(dev); 800 if (rc) 801 pr_err("Could not register llcp device\n"); 802 803 rc = nfc_genl_device_added(dev); 804 if (rc) 805 pr_debug("The userspace won't be notified that the device %s was added\n", 806 dev_name(&dev->dev)); 807 808 return 0; 809} 810EXPORT_SYMBOL(nfc_register_device); 811 812/** 813 * nfc_unregister_device - unregister a nfc device in the nfc subsystem 814 * 815 * @dev: The nfc device to unregister 816 */ 817void nfc_unregister_device(struct nfc_dev *dev) 818{ 819 int rc; 820 821 pr_debug("dev_name=%s\n", dev_name(&dev->dev)); 822 823 mutex_lock(&nfc_devlist_mutex); 824 nfc_devlist_generation++; 825 826 /* lock to avoid unregistering a device while an operation 827 is in progress */ 828 device_lock(&dev->dev); 829 device_del(&dev->dev); 830 device_unlock(&dev->dev); 831 832 mutex_unlock(&nfc_devlist_mutex); 833 834 nfc_llcp_unregister_device(dev); 835 836 rc = nfc_genl_device_removed(dev); 837 if (rc) 838 pr_debug("The userspace won't be notified that the device %s was removed\n", 839 dev_name(&dev->dev)); 840 841} 842EXPORT_SYMBOL(nfc_unregister_device); 843 844static int __init nfc_init(void) 845{ 846 int rc; 847 848 pr_info("NFC Core ver %s\n", VERSION); 849 850 rc = class_register(&nfc_class); 851 if (rc) 852 return rc; 853 854 rc = nfc_genl_init(); 855 if (rc) 856 goto err_genl; 857 858 /* the first generation must not be 0 */ 859 nfc_devlist_generation = 1; 860 861 rc = rawsock_init(); 862 if (rc) 863 goto err_rawsock; 864 865 rc = nfc_llcp_init(); 866 if (rc) 867 goto err_llcp_sock; 868 869 rc = af_nfc_init(); 870 if (rc) 871 goto err_af_nfc; 872 873 return 0; 874 875err_af_nfc: 876 nfc_llcp_exit(); 877err_llcp_sock: 878 rawsock_exit(); 879err_rawsock: 880 nfc_genl_exit(); 881err_genl: 882 class_unregister(&nfc_class); 883 return rc; 884} 885 886static void __exit nfc_exit(void) 887{ 888 af_nfc_exit(); 889 nfc_llcp_exit(); 890 rawsock_exit(); 891 nfc_genl_exit(); 892 class_unregister(&nfc_class); 893} 894 895subsys_initcall(nfc_init); 896module_exit(nfc_exit); 897 898MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>"); 899MODULE_DESCRIPTION("NFC Core ver " VERSION); 900MODULE_VERSION(VERSION); 901MODULE_LICENSE("GPL"); 902