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/module.h> 31 #include <linux/types.h> 32 #include <linux/workqueue.h> 33 #include <linux/completion.h> 34 #include <linux/export.h> 35 #include <linux/sched.h> 36 #include <linux/bitops.h> 37 #include <linux/skbuff.h> 38 39 #include "../nfc.h" 40 #include <net/nfc/nci.h> 41 #include <net/nfc/nci_core.h> 42 #include <linux/nfc.h> 43 44 static void nci_cmd_work(struct work_struct *work); 45 static void nci_rx_work(struct work_struct *work); 46 static void nci_tx_work(struct work_struct *work); 47 48 /* ---- NCI requests ---- */ 49 50 void nci_req_complete(struct nci_dev *ndev, int result) 51 { 52 if (ndev->req_status == NCI_REQ_PEND) { 53 ndev->req_result = result; 54 ndev->req_status = NCI_REQ_DONE; 55 complete(&ndev->req_completion); 56 } 57 } 58 59 static void nci_req_cancel(struct nci_dev *ndev, int err) 60 { 61 if (ndev->req_status == NCI_REQ_PEND) { 62 ndev->req_result = err; 63 ndev->req_status = NCI_REQ_CANCELED; 64 complete(&ndev->req_completion); 65 } 66 } 67 68 /* Execute request and wait for completion. */ 69 static int __nci_request(struct nci_dev *ndev, 70 void (*req)(struct nci_dev *ndev, unsigned long opt), 71 unsigned long opt, __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 = 81 wait_for_completion_interruptible_timeout(&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, 114 unsigned long opt), 115 unsigned long opt, __u32 timeout) 116 { 117 int rc; 118 119 if (!test_bit(NCI_UP, &ndev->flags)) 120 return -ENETDOWN; 121 122 /* Serialize all requests */ 123 mutex_lock(&ndev->req_lock); 124 rc = __nci_request(ndev, req, opt, timeout); 125 mutex_unlock(&ndev->req_lock); 126 127 return rc; 128 } 129 130 static void nci_reset_req(struct nci_dev *ndev, unsigned long opt) 131 { 132 struct nci_core_reset_cmd cmd; 133 134 cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG; 135 nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd); 136 } 137 138 static void nci_init_req(struct nci_dev *ndev, unsigned long opt) 139 { 140 nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL); 141 } 142 143 static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt) 144 { 145 struct nci_rf_disc_map_cmd cmd; 146 struct disc_map_config *cfg = cmd.mapping_configs; 147 __u8 *num = &cmd.num_mapping_configs; 148 int i; 149 150 /* set rf mapping configurations */ 151 *num = 0; 152 153 /* by default mapping is set to NCI_RF_INTERFACE_FRAME */ 154 for (i = 0; i < ndev->num_supported_rf_interfaces; i++) { 155 if (ndev->supported_rf_interfaces[i] == 156 NCI_RF_INTERFACE_ISO_DEP) { 157 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP; 158 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL | 159 NCI_DISC_MAP_MODE_LISTEN; 160 cfg[*num].rf_interface = NCI_RF_INTERFACE_ISO_DEP; 161 (*num)++; 162 } else if (ndev->supported_rf_interfaces[i] == 163 NCI_RF_INTERFACE_NFC_DEP) { 164 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP; 165 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL | 166 NCI_DISC_MAP_MODE_LISTEN; 167 cfg[*num].rf_interface = NCI_RF_INTERFACE_NFC_DEP; 168 (*num)++; 169 } 170 171 if (*num == NCI_MAX_NUM_MAPPING_CONFIGS) 172 break; 173 } 174 175 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD, 176 (1 + ((*num) * sizeof(struct disc_map_config))), &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_B_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), &cmd); 249 } 250 251 static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt) 252 { 253 struct nci_rf_deactivate_cmd cmd; 254 255 cmd.type = NCI_DEACTIVATE_TYPE_IDLE_MODE; 256 257 nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD, 258 sizeof(struct nci_rf_deactivate_cmd), &cmd); 259 } 260 261 static int nci_open_device(struct nci_dev *ndev) 262 { 263 int rc = 0; 264 265 mutex_lock(&ndev->req_lock); 266 267 if (test_bit(NCI_UP, &ndev->flags)) { 268 rc = -EALREADY; 269 goto done; 270 } 271 272 if (ndev->ops->open(ndev)) { 273 rc = -EIO; 274 goto done; 275 } 276 277 atomic_set(&ndev->cmd_cnt, 1); 278 279 set_bit(NCI_INIT, &ndev->flags); 280 281 rc = __nci_request(ndev, nci_reset_req, 0, 282 msecs_to_jiffies(NCI_RESET_TIMEOUT)); 283 284 if (!rc) { 285 rc = __nci_request(ndev, nci_init_req, 0, 286 msecs_to_jiffies(NCI_INIT_TIMEOUT)); 287 } 288 289 if (!rc) { 290 rc = __nci_request(ndev, nci_init_complete_req, 0, 291 msecs_to_jiffies(NCI_INIT_TIMEOUT)); 292 } 293 294 clear_bit(NCI_INIT, &ndev->flags); 295 296 if (!rc) { 297 set_bit(NCI_UP, &ndev->flags); 298 nci_clear_target_list(ndev); 299 atomic_set(&ndev->state, NCI_IDLE); 300 } else { 301 /* Init failed, cleanup */ 302 skb_queue_purge(&ndev->cmd_q); 303 skb_queue_purge(&ndev->rx_q); 304 skb_queue_purge(&ndev->tx_q); 305 306 ndev->ops->close(ndev); 307 ndev->flags = 0; 308 } 309 310 done: 311 mutex_unlock(&ndev->req_lock); 312 return rc; 313 } 314 315 static int nci_close_device(struct nci_dev *ndev) 316 { 317 nci_req_cancel(ndev, ENODEV); 318 mutex_lock(&ndev->req_lock); 319 320 if (!test_and_clear_bit(NCI_UP, &ndev->flags)) { 321 del_timer_sync(&ndev->cmd_timer); 322 del_timer_sync(&ndev->data_timer); 323 mutex_unlock(&ndev->req_lock); 324 return 0; 325 } 326 327 /* Drop RX and TX queues */ 328 skb_queue_purge(&ndev->rx_q); 329 skb_queue_purge(&ndev->tx_q); 330 331 /* Flush RX and TX wq */ 332 flush_workqueue(ndev->rx_wq); 333 flush_workqueue(ndev->tx_wq); 334 335 /* Reset device */ 336 skb_queue_purge(&ndev->cmd_q); 337 atomic_set(&ndev->cmd_cnt, 1); 338 339 set_bit(NCI_INIT, &ndev->flags); 340 __nci_request(ndev, nci_reset_req, 0, 341 msecs_to_jiffies(NCI_RESET_TIMEOUT)); 342 clear_bit(NCI_INIT, &ndev->flags); 343 344 /* Flush cmd wq */ 345 flush_workqueue(ndev->cmd_wq); 346 347 /* After this point our queues are empty 348 * and no works are scheduled. */ 349 ndev->ops->close(ndev); 350 351 /* Clear flags */ 352 ndev->flags = 0; 353 354 mutex_unlock(&ndev->req_lock); 355 356 return 0; 357 } 358 359 /* NCI command timer function */ 360 static void nci_cmd_timer(unsigned long arg) 361 { 362 struct nci_dev *ndev = (void *) arg; 363 364 atomic_set(&ndev->cmd_cnt, 1); 365 queue_work(ndev->cmd_wq, &ndev->cmd_work); 366 } 367 368 /* NCI data exchange timer function */ 369 static void nci_data_timer(unsigned long arg) 370 { 371 struct nci_dev *ndev = (void *) arg; 372 373 set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); 374 queue_work(ndev->rx_wq, &ndev->rx_work); 375 } 376 377 static int nci_dev_up(struct nfc_dev *nfc_dev) 378 { 379 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 380 381 return nci_open_device(ndev); 382 } 383 384 static int nci_dev_down(struct nfc_dev *nfc_dev) 385 { 386 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 387 388 return nci_close_device(ndev); 389 } 390 391 static int nci_start_poll(struct nfc_dev *nfc_dev, 392 __u32 im_protocols, __u32 tm_protocols) 393 { 394 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 395 int rc; 396 397 if ((atomic_read(&ndev->state) == NCI_DISCOVERY) || 398 (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) { 399 pr_err("unable to start poll, since poll is already active\n"); 400 return -EBUSY; 401 } 402 403 if (ndev->target_active_prot) { 404 pr_err("there is an active target\n"); 405 return -EBUSY; 406 } 407 408 if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) || 409 (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) { 410 pr_debug("target active or w4 select, implicitly deactivate\n"); 411 412 rc = nci_request(ndev, nci_rf_deactivate_req, 0, 413 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 414 if (rc) 415 return -EBUSY; 416 } 417 418 rc = nci_request(ndev, nci_rf_discover_req, im_protocols, 419 msecs_to_jiffies(NCI_RF_DISC_TIMEOUT)); 420 421 if (!rc) 422 ndev->poll_prots = im_protocols; 423 424 return rc; 425 } 426 427 static void nci_stop_poll(struct nfc_dev *nfc_dev) 428 { 429 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 430 431 if ((atomic_read(&ndev->state) != NCI_DISCOVERY) && 432 (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) { 433 pr_err("unable to stop poll, since poll is not active\n"); 434 return; 435 } 436 437 nci_request(ndev, nci_rf_deactivate_req, 0, 438 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 439 } 440 441 static int nci_activate_target(struct nfc_dev *nfc_dev, 442 struct nfc_target *target, __u32 protocol) 443 { 444 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 445 struct nci_rf_discover_select_param param; 446 struct nfc_target *nci_target = NULL; 447 int i; 448 int rc = 0; 449 450 pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol); 451 452 if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) && 453 (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) { 454 pr_err("there is no available target to activate\n"); 455 return -EINVAL; 456 } 457 458 if (ndev->target_active_prot) { 459 pr_err("there is already an active target\n"); 460 return -EBUSY; 461 } 462 463 for (i = 0; i < ndev->n_targets; i++) { 464 if (ndev->targets[i].idx == target->idx) { 465 nci_target = &ndev->targets[i]; 466 break; 467 } 468 } 469 470 if (!nci_target) { 471 pr_err("unable to find the selected target\n"); 472 return -EINVAL; 473 } 474 475 if (!(nci_target->supported_protocols & (1 << protocol))) { 476 pr_err("target does not support the requested protocol 0x%x\n", 477 protocol); 478 return -EINVAL; 479 } 480 481 if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) { 482 param.rf_discovery_id = nci_target->logical_idx; 483 484 if (protocol == NFC_PROTO_JEWEL) 485 param.rf_protocol = NCI_RF_PROTOCOL_T1T; 486 else if (protocol == NFC_PROTO_MIFARE) 487 param.rf_protocol = NCI_RF_PROTOCOL_T2T; 488 else if (protocol == NFC_PROTO_FELICA) 489 param.rf_protocol = NCI_RF_PROTOCOL_T3T; 490 else if (protocol == NFC_PROTO_ISO14443 || 491 protocol == NFC_PROTO_ISO14443_B) 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, 508 struct nfc_target *target) 509 { 510 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 511 512 pr_debug("target_idx %d\n", target->idx); 513 514 if (!ndev->target_active_prot) { 515 pr_err("unable to deactivate target, no active target\n"); 516 return; 517 } 518 519 ndev->target_active_prot = 0; 520 521 if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) { 522 nci_request(ndev, nci_rf_deactivate_req, 0, 523 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 524 } 525 } 526 527 static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target, 528 struct sk_buff *skb, 529 data_exchange_cb_t cb, 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 .im_transceive = nci_transceive, 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, int tx_tailroom) 576 { 577 struct nci_dev *ndev; 578 579 pr_debug("supported_protocols 0x%x\n", supported_protocols); 580 581 if (!ops->open || !ops->close || !ops->send) 582 return NULL; 583 584 if (!supported_protocols) 585 return NULL; 586 587 ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL); 588 if (!ndev) 589 return NULL; 590 591 ndev->ops = ops; 592 ndev->tx_headroom = tx_headroom; 593 ndev->tx_tailroom = tx_tailroom; 594 595 ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops, 596 supported_protocols, 597 tx_headroom + NCI_DATA_HDR_SIZE, 598 tx_tailroom); 599 if (!ndev->nfc_dev) 600 goto free_exit; 601 602 nfc_set_drvdata(ndev->nfc_dev, ndev); 603 604 return ndev; 605 606 free_exit: 607 kfree(ndev); 608 return NULL; 609 } 610 EXPORT_SYMBOL(nci_allocate_device); 611 612 /** 613 * nci_free_device - deallocate nci device 614 * 615 * @ndev: The nci device to deallocate 616 */ 617 void nci_free_device(struct nci_dev *ndev) 618 { 619 nfc_free_device(ndev->nfc_dev); 620 kfree(ndev); 621 } 622 EXPORT_SYMBOL(nci_free_device); 623 624 /** 625 * nci_register_device - register a nci device in the nfc subsystem 626 * 627 * @dev: The nci device to register 628 */ 629 int nci_register_device(struct nci_dev *ndev) 630 { 631 int rc; 632 struct device *dev = &ndev->nfc_dev->dev; 633 char name[32]; 634 635 rc = nfc_register_device(ndev->nfc_dev); 636 if (rc) 637 goto exit; 638 639 ndev->flags = 0; 640 641 INIT_WORK(&ndev->cmd_work, nci_cmd_work); 642 snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev)); 643 ndev->cmd_wq = create_singlethread_workqueue(name); 644 if (!ndev->cmd_wq) { 645 rc = -ENOMEM; 646 goto unreg_exit; 647 } 648 649 INIT_WORK(&ndev->rx_work, nci_rx_work); 650 snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev)); 651 ndev->rx_wq = create_singlethread_workqueue(name); 652 if (!ndev->rx_wq) { 653 rc = -ENOMEM; 654 goto destroy_cmd_wq_exit; 655 } 656 657 INIT_WORK(&ndev->tx_work, nci_tx_work); 658 snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev)); 659 ndev->tx_wq = create_singlethread_workqueue(name); 660 if (!ndev->tx_wq) { 661 rc = -ENOMEM; 662 goto destroy_rx_wq_exit; 663 } 664 665 skb_queue_head_init(&ndev->cmd_q); 666 skb_queue_head_init(&ndev->rx_q); 667 skb_queue_head_init(&ndev->tx_q); 668 669 setup_timer(&ndev->cmd_timer, nci_cmd_timer, 670 (unsigned long) ndev); 671 setup_timer(&ndev->data_timer, nci_data_timer, 672 (unsigned long) ndev); 673 674 mutex_init(&ndev->req_lock); 675 676 goto exit; 677 678 destroy_rx_wq_exit: 679 destroy_workqueue(ndev->rx_wq); 680 681 destroy_cmd_wq_exit: 682 destroy_workqueue(ndev->cmd_wq); 683 684 unreg_exit: 685 nfc_unregister_device(ndev->nfc_dev); 686 687 exit: 688 return rc; 689 } 690 EXPORT_SYMBOL(nci_register_device); 691 692 /** 693 * nci_unregister_device - unregister a nci device in the nfc subsystem 694 * 695 * @dev: The nci device to unregister 696 */ 697 void nci_unregister_device(struct nci_dev *ndev) 698 { 699 nci_close_device(ndev); 700 701 destroy_workqueue(ndev->cmd_wq); 702 destroy_workqueue(ndev->rx_wq); 703 destroy_workqueue(ndev->tx_wq); 704 705 nfc_unregister_device(ndev->nfc_dev); 706 } 707 EXPORT_SYMBOL(nci_unregister_device); 708 709 /** 710 * nci_recv_frame - receive frame from NCI drivers 711 * 712 * @skb: The sk_buff to receive 713 */ 714 int nci_recv_frame(struct sk_buff *skb) 715 { 716 struct nci_dev *ndev = (struct nci_dev *) skb->dev; 717 718 pr_debug("len %d\n", skb->len); 719 720 if (!ndev || (!test_bit(NCI_UP, &ndev->flags) 721 && !test_bit(NCI_INIT, &ndev->flags))) { 722 kfree_skb(skb); 723 return -ENXIO; 724 } 725 726 /* Queue frame for rx worker thread */ 727 skb_queue_tail(&ndev->rx_q, skb); 728 queue_work(ndev->rx_wq, &ndev->rx_work); 729 730 return 0; 731 } 732 EXPORT_SYMBOL(nci_recv_frame); 733 734 static int nci_send_frame(struct sk_buff *skb) 735 { 736 struct nci_dev *ndev = (struct nci_dev *) skb->dev; 737 738 pr_debug("len %d\n", skb->len); 739 740 if (!ndev) { 741 kfree_skb(skb); 742 return -ENODEV; 743 } 744 745 /* Get rid of skb owner, prior to sending to the driver. */ 746 skb_orphan(skb); 747 748 return ndev->ops->send(skb); 749 } 750 751 /* Send NCI command */ 752 int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload) 753 { 754 struct nci_ctrl_hdr *hdr; 755 struct sk_buff *skb; 756 757 pr_debug("opcode 0x%x, plen %d\n", opcode, plen); 758 759 skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL); 760 if (!skb) { 761 pr_err("no memory for command\n"); 762 return -ENOMEM; 763 } 764 765 hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE); 766 hdr->gid = nci_opcode_gid(opcode); 767 hdr->oid = nci_opcode_oid(opcode); 768 hdr->plen = plen; 769 770 nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT); 771 nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST); 772 773 if (plen) 774 memcpy(skb_put(skb, plen), payload, plen); 775 776 skb->dev = (void *) ndev; 777 778 skb_queue_tail(&ndev->cmd_q, skb); 779 queue_work(ndev->cmd_wq, &ndev->cmd_work); 780 781 return 0; 782 } 783 784 /* ---- NCI TX Data worker thread ---- */ 785 786 static void nci_tx_work(struct work_struct *work) 787 { 788 struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work); 789 struct sk_buff *skb; 790 791 pr_debug("credits_cnt %d\n", atomic_read(&ndev->credits_cnt)); 792 793 /* Send queued tx data */ 794 while (atomic_read(&ndev->credits_cnt)) { 795 skb = skb_dequeue(&ndev->tx_q); 796 if (!skb) 797 return; 798 799 /* Check if data flow control is used */ 800 if (atomic_read(&ndev->credits_cnt) != 801 NCI_DATA_FLOW_CONTROL_NOT_USED) 802 atomic_dec(&ndev->credits_cnt); 803 804 pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n", 805 nci_pbf(skb->data), 806 nci_conn_id(skb->data), 807 nci_plen(skb->data)); 808 809 nci_send_frame(skb); 810 811 mod_timer(&ndev->data_timer, 812 jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT)); 813 } 814 } 815 816 /* ----- NCI RX worker thread (data & control) ----- */ 817 818 static void nci_rx_work(struct work_struct *work) 819 { 820 struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work); 821 struct sk_buff *skb; 822 823 while ((skb = skb_dequeue(&ndev->rx_q))) { 824 /* Process frame */ 825 switch (nci_mt(skb->data)) { 826 case NCI_MT_RSP_PKT: 827 nci_rsp_packet(ndev, skb); 828 break; 829 830 case NCI_MT_NTF_PKT: 831 nci_ntf_packet(ndev, skb); 832 break; 833 834 case NCI_MT_DATA_PKT: 835 nci_rx_data_packet(ndev, skb); 836 break; 837 838 default: 839 pr_err("unknown MT 0x%x\n", nci_mt(skb->data)); 840 kfree_skb(skb); 841 break; 842 } 843 } 844 845 /* check if a data exchange timout has occurred */ 846 if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) { 847 /* complete the data exchange transaction, if exists */ 848 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 849 nci_data_exchange_complete(ndev, NULL, -ETIMEDOUT); 850 851 clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); 852 } 853 } 854 855 /* ----- NCI TX CMD worker thread ----- */ 856 857 static void nci_cmd_work(struct work_struct *work) 858 { 859 struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work); 860 struct sk_buff *skb; 861 862 pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt)); 863 864 /* Send queued command */ 865 if (atomic_read(&ndev->cmd_cnt)) { 866 skb = skb_dequeue(&ndev->cmd_q); 867 if (!skb) 868 return; 869 870 atomic_dec(&ndev->cmd_cnt); 871 872 pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n", 873 nci_pbf(skb->data), 874 nci_opcode_gid(nci_opcode(skb->data)), 875 nci_opcode_oid(nci_opcode(skb->data)), 876 nci_plen(skb->data)); 877 878 nci_send_frame(skb); 879 880 mod_timer(&ndev->cmd_timer, 881 jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT)); 882 } 883 } 884 885 MODULE_LICENSE("GPL"); 886