1 /* 2 * The NFC Controller Interface is the communication protocol between an 3 * NFC Controller (NFCC) and a Device Host (DH). 4 * 5 * Copyright (C) 2011 Texas Instruments, Inc. 6 * 7 * Written by Ilan Elias <ilane@ti.com> 8 * 9 * Acknowledgements: 10 * This file is based on hci_core.c, which was written 11 * by Maxim Krasnyansky. 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License version 2 15 * as published by the Free Software Foundation 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 25 * 26 */ 27 28 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ 29 30 #include <linux/types.h> 31 #include <linux/workqueue.h> 32 #include <linux/completion.h> 33 #include <linux/export.h> 34 #include <linux/sched.h> 35 #include <linux/bitops.h> 36 #include <linux/skbuff.h> 37 38 #include "../nfc.h" 39 #include <net/nfc/nci.h> 40 #include <net/nfc/nci_core.h> 41 #include <linux/nfc.h> 42 43 static void nci_cmd_work(struct work_struct *work); 44 static void nci_rx_work(struct work_struct *work); 45 static void nci_tx_work(struct work_struct *work); 46 47 /* ---- NCI requests ---- */ 48 49 void nci_req_complete(struct nci_dev *ndev, int result) 50 { 51 if (ndev->req_status == NCI_REQ_PEND) { 52 ndev->req_result = result; 53 ndev->req_status = NCI_REQ_DONE; 54 complete(&ndev->req_completion); 55 } 56 } 57 58 static void nci_req_cancel(struct nci_dev *ndev, int err) 59 { 60 if (ndev->req_status == NCI_REQ_PEND) { 61 ndev->req_result = err; 62 ndev->req_status = NCI_REQ_CANCELED; 63 complete(&ndev->req_completion); 64 } 65 } 66 67 /* Execute request and wait for completion. */ 68 static int __nci_request(struct nci_dev *ndev, 69 void (*req)(struct nci_dev *ndev, unsigned long opt), 70 unsigned long opt, 71 __u32 timeout) 72 { 73 int rc = 0; 74 long completion_rc; 75 76 ndev->req_status = NCI_REQ_PEND; 77 78 init_completion(&ndev->req_completion); 79 req(ndev, opt); 80 completion_rc = wait_for_completion_interruptible_timeout( 81 &ndev->req_completion, 82 timeout); 83 84 pr_debug("wait_for_completion return %ld\n", completion_rc); 85 86 if (completion_rc > 0) { 87 switch (ndev->req_status) { 88 case NCI_REQ_DONE: 89 rc = nci_to_errno(ndev->req_result); 90 break; 91 92 case NCI_REQ_CANCELED: 93 rc = -ndev->req_result; 94 break; 95 96 default: 97 rc = -ETIMEDOUT; 98 break; 99 } 100 } else { 101 pr_err("wait_for_completion_interruptible_timeout failed %ld\n", 102 completion_rc); 103 104 rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc)); 105 } 106 107 ndev->req_status = ndev->req_result = 0; 108 109 return rc; 110 } 111 112 static inline int nci_request(struct nci_dev *ndev, 113 void (*req)(struct nci_dev *ndev, unsigned long opt), 114 unsigned long opt, __u32 timeout) 115 { 116 int rc; 117 118 if (!test_bit(NCI_UP, &ndev->flags)) 119 return -ENETDOWN; 120 121 /* Serialize all requests */ 122 mutex_lock(&ndev->req_lock); 123 rc = __nci_request(ndev, req, opt, timeout); 124 mutex_unlock(&ndev->req_lock); 125 126 return rc; 127 } 128 129 static void nci_reset_req(struct nci_dev *ndev, unsigned long opt) 130 { 131 struct nci_core_reset_cmd cmd; 132 133 cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG; 134 nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd); 135 } 136 137 static void nci_init_req(struct nci_dev *ndev, unsigned long opt) 138 { 139 nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL); 140 } 141 142 static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt) 143 { 144 struct nci_rf_disc_map_cmd cmd; 145 struct disc_map_config *cfg = cmd.mapping_configs; 146 __u8 *num = &cmd.num_mapping_configs; 147 int i; 148 149 /* set rf mapping configurations */ 150 *num = 0; 151 152 /* by default mapping is set to NCI_RF_INTERFACE_FRAME */ 153 for (i = 0; i < ndev->num_supported_rf_interfaces; i++) { 154 if (ndev->supported_rf_interfaces[i] == 155 NCI_RF_INTERFACE_ISO_DEP) { 156 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP; 157 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL | 158 NCI_DISC_MAP_MODE_LISTEN; 159 cfg[*num].rf_interface = NCI_RF_INTERFACE_ISO_DEP; 160 (*num)++; 161 } else if (ndev->supported_rf_interfaces[i] == 162 NCI_RF_INTERFACE_NFC_DEP) { 163 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP; 164 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL | 165 NCI_DISC_MAP_MODE_LISTEN; 166 cfg[*num].rf_interface = NCI_RF_INTERFACE_NFC_DEP; 167 (*num)++; 168 } 169 170 if (*num == NCI_MAX_NUM_MAPPING_CONFIGS) 171 break; 172 } 173 174 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD, 175 (1 + ((*num)*sizeof(struct disc_map_config))), 176 &cmd); 177 } 178 179 static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt) 180 { 181 struct nci_rf_disc_cmd cmd; 182 __u32 protocols = opt; 183 184 cmd.num_disc_configs = 0; 185 186 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 187 (protocols & NFC_PROTO_JEWEL_MASK 188 || protocols & NFC_PROTO_MIFARE_MASK 189 || protocols & NFC_PROTO_ISO14443_MASK 190 || protocols & NFC_PROTO_NFC_DEP_MASK)) { 191 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 192 NCI_NFC_A_PASSIVE_POLL_MODE; 193 cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 194 cmd.num_disc_configs++; 195 } 196 197 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 198 (protocols & NFC_PROTO_ISO14443_MASK)) { 199 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 200 NCI_NFC_B_PASSIVE_POLL_MODE; 201 cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 202 cmd.num_disc_configs++; 203 } 204 205 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 206 (protocols & NFC_PROTO_FELICA_MASK 207 || protocols & NFC_PROTO_NFC_DEP_MASK)) { 208 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 209 NCI_NFC_F_PASSIVE_POLL_MODE; 210 cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 211 cmd.num_disc_configs++; 212 } 213 214 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD, 215 (1 + (cmd.num_disc_configs*sizeof(struct disc_config))), 216 &cmd); 217 } 218 219 struct nci_rf_discover_select_param { 220 __u8 rf_discovery_id; 221 __u8 rf_protocol; 222 }; 223 224 static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt) 225 { 226 struct nci_rf_discover_select_param *param = 227 (struct nci_rf_discover_select_param *)opt; 228 struct nci_rf_discover_select_cmd cmd; 229 230 cmd.rf_discovery_id = param->rf_discovery_id; 231 cmd.rf_protocol = param->rf_protocol; 232 233 switch (cmd.rf_protocol) { 234 case NCI_RF_PROTOCOL_ISO_DEP: 235 cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP; 236 break; 237 238 case NCI_RF_PROTOCOL_NFC_DEP: 239 cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP; 240 break; 241 242 default: 243 cmd.rf_interface = NCI_RF_INTERFACE_FRAME; 244 break; 245 } 246 247 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD, 248 sizeof(struct nci_rf_discover_select_cmd), 249 &cmd); 250 } 251 252 static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt) 253 { 254 struct nci_rf_deactivate_cmd cmd; 255 256 cmd.type = NCI_DEACTIVATE_TYPE_IDLE_MODE; 257 258 nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD, 259 sizeof(struct nci_rf_deactivate_cmd), 260 &cmd); 261 } 262 263 static int nci_open_device(struct nci_dev *ndev) 264 { 265 int rc = 0; 266 267 mutex_lock(&ndev->req_lock); 268 269 if (test_bit(NCI_UP, &ndev->flags)) { 270 rc = -EALREADY; 271 goto done; 272 } 273 274 if (ndev->ops->open(ndev)) { 275 rc = -EIO; 276 goto done; 277 } 278 279 atomic_set(&ndev->cmd_cnt, 1); 280 281 set_bit(NCI_INIT, &ndev->flags); 282 283 rc = __nci_request(ndev, nci_reset_req, 0, 284 msecs_to_jiffies(NCI_RESET_TIMEOUT)); 285 286 if (!rc) { 287 rc = __nci_request(ndev, nci_init_req, 0, 288 msecs_to_jiffies(NCI_INIT_TIMEOUT)); 289 } 290 291 if (!rc) { 292 rc = __nci_request(ndev, nci_init_complete_req, 0, 293 msecs_to_jiffies(NCI_INIT_TIMEOUT)); 294 } 295 296 clear_bit(NCI_INIT, &ndev->flags); 297 298 if (!rc) { 299 set_bit(NCI_UP, &ndev->flags); 300 nci_clear_target_list(ndev); 301 atomic_set(&ndev->state, NCI_IDLE); 302 } else { 303 /* Init failed, cleanup */ 304 skb_queue_purge(&ndev->cmd_q); 305 skb_queue_purge(&ndev->rx_q); 306 skb_queue_purge(&ndev->tx_q); 307 308 ndev->ops->close(ndev); 309 ndev->flags = 0; 310 } 311 312 done: 313 mutex_unlock(&ndev->req_lock); 314 return rc; 315 } 316 317 static int nci_close_device(struct nci_dev *ndev) 318 { 319 nci_req_cancel(ndev, ENODEV); 320 mutex_lock(&ndev->req_lock); 321 322 if (!test_and_clear_bit(NCI_UP, &ndev->flags)) { 323 del_timer_sync(&ndev->cmd_timer); 324 del_timer_sync(&ndev->data_timer); 325 mutex_unlock(&ndev->req_lock); 326 return 0; 327 } 328 329 /* Drop RX and TX queues */ 330 skb_queue_purge(&ndev->rx_q); 331 skb_queue_purge(&ndev->tx_q); 332 333 /* Flush RX and TX wq */ 334 flush_workqueue(ndev->rx_wq); 335 flush_workqueue(ndev->tx_wq); 336 337 /* Reset device */ 338 skb_queue_purge(&ndev->cmd_q); 339 atomic_set(&ndev->cmd_cnt, 1); 340 341 set_bit(NCI_INIT, &ndev->flags); 342 __nci_request(ndev, nci_reset_req, 0, 343 msecs_to_jiffies(NCI_RESET_TIMEOUT)); 344 clear_bit(NCI_INIT, &ndev->flags); 345 346 /* Flush cmd wq */ 347 flush_workqueue(ndev->cmd_wq); 348 349 /* After this point our queues are empty 350 * and no works are scheduled. */ 351 ndev->ops->close(ndev); 352 353 /* Clear flags */ 354 ndev->flags = 0; 355 356 mutex_unlock(&ndev->req_lock); 357 358 return 0; 359 } 360 361 /* NCI command timer function */ 362 static void nci_cmd_timer(unsigned long arg) 363 { 364 struct nci_dev *ndev = (void *) arg; 365 366 atomic_set(&ndev->cmd_cnt, 1); 367 queue_work(ndev->cmd_wq, &ndev->cmd_work); 368 } 369 370 /* NCI data exchange timer function */ 371 static void nci_data_timer(unsigned long arg) 372 { 373 struct nci_dev *ndev = (void *) arg; 374 375 set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); 376 queue_work(ndev->rx_wq, &ndev->rx_work); 377 } 378 379 static int nci_dev_up(struct nfc_dev *nfc_dev) 380 { 381 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 382 383 return nci_open_device(ndev); 384 } 385 386 static int nci_dev_down(struct nfc_dev *nfc_dev) 387 { 388 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 389 390 return nci_close_device(ndev); 391 } 392 393 static int nci_start_poll(struct nfc_dev *nfc_dev, __u32 protocols) 394 { 395 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 396 int rc; 397 398 if ((atomic_read(&ndev->state) == NCI_DISCOVERY) || 399 (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) { 400 pr_err("unable to start poll, since poll is already active\n"); 401 return -EBUSY; 402 } 403 404 if (ndev->target_active_prot) { 405 pr_err("there is an active target\n"); 406 return -EBUSY; 407 } 408 409 if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) || 410 (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) { 411 pr_debug("target active or w4 select, implicitly deactivate\n"); 412 413 rc = nci_request(ndev, nci_rf_deactivate_req, 0, 414 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 415 if (rc) 416 return -EBUSY; 417 } 418 419 rc = nci_request(ndev, nci_rf_discover_req, protocols, 420 msecs_to_jiffies(NCI_RF_DISC_TIMEOUT)); 421 422 if (!rc) 423 ndev->poll_prots = protocols; 424 425 return rc; 426 } 427 428 static void nci_stop_poll(struct nfc_dev *nfc_dev) 429 { 430 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 431 432 if ((atomic_read(&ndev->state) != NCI_DISCOVERY) && 433 (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) { 434 pr_err("unable to stop poll, since poll is not active\n"); 435 return; 436 } 437 438 nci_request(ndev, nci_rf_deactivate_req, 0, 439 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 440 } 441 442 static int nci_activate_target(struct nfc_dev *nfc_dev, __u32 target_idx, 443 __u32 protocol) 444 { 445 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 446 struct nci_rf_discover_select_param param; 447 struct nfc_target *target = NULL; 448 int i; 449 int rc = 0; 450 451 pr_debug("target_idx %d, protocol 0x%x\n", target_idx, protocol); 452 453 if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) && 454 (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) { 455 pr_err("there is no available target to activate\n"); 456 return -EINVAL; 457 } 458 459 if (ndev->target_active_prot) { 460 pr_err("there is already an active target\n"); 461 return -EBUSY; 462 } 463 464 for (i = 0; i < ndev->n_targets; i++) { 465 if (ndev->targets[i].idx == target_idx) { 466 target = &ndev->targets[i]; 467 break; 468 } 469 } 470 471 if (!target) { 472 pr_err("unable to find the selected target\n"); 473 return -EINVAL; 474 } 475 476 if (!(target->supported_protocols & (1 << protocol))) { 477 pr_err("target does not support the requested protocol 0x%x\n", 478 protocol); 479 return -EINVAL; 480 } 481 482 if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) { 483 param.rf_discovery_id = target->idx; 484 485 if (protocol == NFC_PROTO_JEWEL) 486 param.rf_protocol = NCI_RF_PROTOCOL_T1T; 487 else if (protocol == NFC_PROTO_MIFARE) 488 param.rf_protocol = NCI_RF_PROTOCOL_T2T; 489 else if (protocol == NFC_PROTO_FELICA) 490 param.rf_protocol = NCI_RF_PROTOCOL_T3T; 491 else if (protocol == NFC_PROTO_ISO14443) 492 param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP; 493 else 494 param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP; 495 496 rc = nci_request(ndev, nci_rf_discover_select_req, 497 (unsigned long)¶m, 498 msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT)); 499 } 500 501 if (!rc) 502 ndev->target_active_prot = protocol; 503 504 return rc; 505 } 506 507 static void nci_deactivate_target(struct nfc_dev *nfc_dev, __u32 target_idx) 508 { 509 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 510 511 pr_debug("target_idx %d\n", target_idx); 512 513 if (!ndev->target_active_prot) { 514 pr_err("unable to deactivate target, no active target\n"); 515 return; 516 } 517 518 ndev->target_active_prot = 0; 519 520 if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) { 521 nci_request(ndev, nci_rf_deactivate_req, 0, 522 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 523 } 524 } 525 526 static int nci_data_exchange(struct nfc_dev *nfc_dev, __u32 target_idx, 527 struct sk_buff *skb, 528 data_exchange_cb_t cb, 529 void *cb_context) 530 { 531 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 532 int rc; 533 534 pr_debug("target_idx %d, len %d\n", target_idx, skb->len); 535 536 if (!ndev->target_active_prot) { 537 pr_err("unable to exchange data, no active target\n"); 538 return -EINVAL; 539 } 540 541 if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 542 return -EBUSY; 543 544 /* store cb and context to be used on receiving data */ 545 ndev->data_exchange_cb = cb; 546 ndev->data_exchange_cb_context = cb_context; 547 548 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb); 549 if (rc) 550 clear_bit(NCI_DATA_EXCHANGE, &ndev->flags); 551 552 return rc; 553 } 554 555 static struct nfc_ops nci_nfc_ops = { 556 .dev_up = nci_dev_up, 557 .dev_down = nci_dev_down, 558 .start_poll = nci_start_poll, 559 .stop_poll = nci_stop_poll, 560 .activate_target = nci_activate_target, 561 .deactivate_target = nci_deactivate_target, 562 .data_exchange = nci_data_exchange, 563 }; 564 565 /* ---- Interface to NCI drivers ---- */ 566 567 /** 568 * nci_allocate_device - allocate a new nci device 569 * 570 * @ops: device operations 571 * @supported_protocols: NFC protocols supported by the device 572 */ 573 struct nci_dev *nci_allocate_device(struct nci_ops *ops, 574 __u32 supported_protocols, 575 int tx_headroom, 576 int tx_tailroom) 577 { 578 struct nci_dev *ndev; 579 580 pr_debug("supported_protocols 0x%x\n", supported_protocols); 581 582 if (!ops->open || !ops->close || !ops->send) 583 return NULL; 584 585 if (!supported_protocols) 586 return NULL; 587 588 ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL); 589 if (!ndev) 590 return NULL; 591 592 ndev->ops = ops; 593 ndev->tx_headroom = tx_headroom; 594 ndev->tx_tailroom = tx_tailroom; 595 596 ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops, 597 supported_protocols, 598 tx_headroom + NCI_DATA_HDR_SIZE, 599 tx_tailroom); 600 if (!ndev->nfc_dev) 601 goto free_exit; 602 603 nfc_set_drvdata(ndev->nfc_dev, ndev); 604 605 return ndev; 606 607 free_exit: 608 kfree(ndev); 609 return NULL; 610 } 611 EXPORT_SYMBOL(nci_allocate_device); 612 613 /** 614 * nci_free_device - deallocate nci device 615 * 616 * @ndev: The nci device to deallocate 617 */ 618 void nci_free_device(struct nci_dev *ndev) 619 { 620 nfc_free_device(ndev->nfc_dev); 621 kfree(ndev); 622 } 623 EXPORT_SYMBOL(nci_free_device); 624 625 /** 626 * nci_register_device - register a nci device in the nfc subsystem 627 * 628 * @dev: The nci device to register 629 */ 630 int nci_register_device(struct nci_dev *ndev) 631 { 632 int rc; 633 struct device *dev = &ndev->nfc_dev->dev; 634 char name[32]; 635 636 rc = nfc_register_device(ndev->nfc_dev); 637 if (rc) 638 goto exit; 639 640 ndev->flags = 0; 641 642 INIT_WORK(&ndev->cmd_work, nci_cmd_work); 643 snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev)); 644 ndev->cmd_wq = create_singlethread_workqueue(name); 645 if (!ndev->cmd_wq) { 646 rc = -ENOMEM; 647 goto unreg_exit; 648 } 649 650 INIT_WORK(&ndev->rx_work, nci_rx_work); 651 snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev)); 652 ndev->rx_wq = create_singlethread_workqueue(name); 653 if (!ndev->rx_wq) { 654 rc = -ENOMEM; 655 goto destroy_cmd_wq_exit; 656 } 657 658 INIT_WORK(&ndev->tx_work, nci_tx_work); 659 snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev)); 660 ndev->tx_wq = create_singlethread_workqueue(name); 661 if (!ndev->tx_wq) { 662 rc = -ENOMEM; 663 goto destroy_rx_wq_exit; 664 } 665 666 skb_queue_head_init(&ndev->cmd_q); 667 skb_queue_head_init(&ndev->rx_q); 668 skb_queue_head_init(&ndev->tx_q); 669 670 setup_timer(&ndev->cmd_timer, nci_cmd_timer, 671 (unsigned long) ndev); 672 setup_timer(&ndev->data_timer, nci_data_timer, 673 (unsigned long) ndev); 674 675 mutex_init(&ndev->req_lock); 676 677 goto exit; 678 679 destroy_rx_wq_exit: 680 destroy_workqueue(ndev->rx_wq); 681 682 destroy_cmd_wq_exit: 683 destroy_workqueue(ndev->cmd_wq); 684 685 unreg_exit: 686 nfc_unregister_device(ndev->nfc_dev); 687 688 exit: 689 return rc; 690 } 691 EXPORT_SYMBOL(nci_register_device); 692 693 /** 694 * nci_unregister_device - unregister a nci device in the nfc subsystem 695 * 696 * @dev: The nci device to unregister 697 */ 698 void nci_unregister_device(struct nci_dev *ndev) 699 { 700 nci_close_device(ndev); 701 702 destroy_workqueue(ndev->cmd_wq); 703 destroy_workqueue(ndev->rx_wq); 704 destroy_workqueue(ndev->tx_wq); 705 706 nfc_unregister_device(ndev->nfc_dev); 707 } 708 EXPORT_SYMBOL(nci_unregister_device); 709 710 /** 711 * nci_recv_frame - receive frame from NCI drivers 712 * 713 * @skb: The sk_buff to receive 714 */ 715 int nci_recv_frame(struct sk_buff *skb) 716 { 717 struct nci_dev *ndev = (struct nci_dev *) skb->dev; 718 719 pr_debug("len %d\n", skb->len); 720 721 if (!ndev || (!test_bit(NCI_UP, &ndev->flags) 722 && !test_bit(NCI_INIT, &ndev->flags))) { 723 kfree_skb(skb); 724 return -ENXIO; 725 } 726 727 /* Queue frame for rx worker thread */ 728 skb_queue_tail(&ndev->rx_q, skb); 729 queue_work(ndev->rx_wq, &ndev->rx_work); 730 731 return 0; 732 } 733 EXPORT_SYMBOL(nci_recv_frame); 734 735 static int nci_send_frame(struct sk_buff *skb) 736 { 737 struct nci_dev *ndev = (struct nci_dev *) skb->dev; 738 739 pr_debug("len %d\n", skb->len); 740 741 if (!ndev) { 742 kfree_skb(skb); 743 return -ENODEV; 744 } 745 746 /* Get rid of skb owner, prior to sending to the driver. */ 747 skb_orphan(skb); 748 749 return ndev->ops->send(skb); 750 } 751 752 /* Send NCI command */ 753 int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload) 754 { 755 struct nci_ctrl_hdr *hdr; 756 struct sk_buff *skb; 757 758 pr_debug("opcode 0x%x, plen %d\n", opcode, plen); 759 760 skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL); 761 if (!skb) { 762 pr_err("no memory for command\n"); 763 return -ENOMEM; 764 } 765 766 hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE); 767 hdr->gid = nci_opcode_gid(opcode); 768 hdr->oid = nci_opcode_oid(opcode); 769 hdr->plen = plen; 770 771 nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT); 772 nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST); 773 774 if (plen) 775 memcpy(skb_put(skb, plen), payload, plen); 776 777 skb->dev = (void *) ndev; 778 779 skb_queue_tail(&ndev->cmd_q, skb); 780 queue_work(ndev->cmd_wq, &ndev->cmd_work); 781 782 return 0; 783 } 784 785 /* ---- NCI TX Data worker thread ---- */ 786 787 static void nci_tx_work(struct work_struct *work) 788 { 789 struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work); 790 struct sk_buff *skb; 791 792 pr_debug("credits_cnt %d\n", atomic_read(&ndev->credits_cnt)); 793 794 /* Send queued tx data */ 795 while (atomic_read(&ndev->credits_cnt)) { 796 skb = skb_dequeue(&ndev->tx_q); 797 if (!skb) 798 return; 799 800 /* Check if data flow control is used */ 801 if (atomic_read(&ndev->credits_cnt) != 802 NCI_DATA_FLOW_CONTROL_NOT_USED) 803 atomic_dec(&ndev->credits_cnt); 804 805 pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n", 806 nci_pbf(skb->data), 807 nci_conn_id(skb->data), 808 nci_plen(skb->data)); 809 810 nci_send_frame(skb); 811 812 mod_timer(&ndev->data_timer, 813 jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT)); 814 } 815 } 816 817 /* ----- NCI RX worker thread (data & control) ----- */ 818 819 static void nci_rx_work(struct work_struct *work) 820 { 821 struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work); 822 struct sk_buff *skb; 823 824 while ((skb = skb_dequeue(&ndev->rx_q))) { 825 /* Process frame */ 826 switch (nci_mt(skb->data)) { 827 case NCI_MT_RSP_PKT: 828 nci_rsp_packet(ndev, skb); 829 break; 830 831 case NCI_MT_NTF_PKT: 832 nci_ntf_packet(ndev, skb); 833 break; 834 835 case NCI_MT_DATA_PKT: 836 nci_rx_data_packet(ndev, skb); 837 break; 838 839 default: 840 pr_err("unknown MT 0x%x\n", nci_mt(skb->data)); 841 kfree_skb(skb); 842 break; 843 } 844 } 845 846 /* check if a data exchange timout has occurred */ 847 if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) { 848 /* complete the data exchange transaction, if exists */ 849 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 850 nci_data_exchange_complete(ndev, NULL, -ETIMEDOUT); 851 852 clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); 853 } 854 } 855 856 /* ----- NCI TX CMD worker thread ----- */ 857 858 static void nci_cmd_work(struct work_struct *work) 859 { 860 struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work); 861 struct sk_buff *skb; 862 863 pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt)); 864 865 /* Send queued command */ 866 if (atomic_read(&ndev->cmd_cnt)) { 867 skb = skb_dequeue(&ndev->cmd_q); 868 if (!skb) 869 return; 870 871 atomic_dec(&ndev->cmd_cnt); 872 873 pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n", 874 nci_pbf(skb->data), 875 nci_opcode_gid(nci_opcode(skb->data)), 876 nci_opcode_oid(nci_opcode(skb->data)), 877 nci_plen(skb->data)); 878 879 nci_send_frame(skb); 880 881 mod_timer(&ndev->cmd_timer, 882 jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT)); 883 } 884 } 885