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, see <http://www.gnu.org/licenses/>. 24 * 25 */ 26 27#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ 28 29#include <linux/module.h> 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 43static void nci_cmd_work(struct work_struct *work); 44static void nci_rx_work(struct work_struct *work); 45static void nci_tx_work(struct work_struct *work); 46 47/* ---- NCI requests ---- */ 48 49void 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 58static 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. */ 68static int __nci_request(struct nci_dev *ndev, 69 void (*req)(struct nci_dev *ndev, unsigned long opt), 70 unsigned long opt, __u32 timeout) 71{ 72 int rc = 0; 73 long completion_rc; 74 75 ndev->req_status = NCI_REQ_PEND; 76 77 reinit_completion(&ndev->req_completion); 78 req(ndev, opt); 79 completion_rc = 80 wait_for_completion_interruptible_timeout(&ndev->req_completion, 81 timeout); 82 83 pr_debug("wait_for_completion return %ld\n", completion_rc); 84 85 if (completion_rc > 0) { 86 switch (ndev->req_status) { 87 case NCI_REQ_DONE: 88 rc = nci_to_errno(ndev->req_result); 89 break; 90 91 case NCI_REQ_CANCELED: 92 rc = -ndev->req_result; 93 break; 94 95 default: 96 rc = -ETIMEDOUT; 97 break; 98 } 99 } else { 100 pr_err("wait_for_completion_interruptible_timeout failed %ld\n", 101 completion_rc); 102 103 rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc)); 104 } 105 106 ndev->req_status = ndev->req_result = 0; 107 108 return rc; 109} 110 111static inline int nci_request(struct nci_dev *ndev, 112 void (*req)(struct nci_dev *ndev, 113 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 129static 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 137static 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 142static 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))), &cmd); 176} 177 178struct nci_set_config_param { 179 __u8 id; 180 size_t len; 181 __u8 *val; 182}; 183 184static void nci_set_config_req(struct nci_dev *ndev, unsigned long opt) 185{ 186 struct nci_set_config_param *param = (struct nci_set_config_param *)opt; 187 struct nci_core_set_config_cmd cmd; 188 189 BUG_ON(param->len > NCI_MAX_PARAM_LEN); 190 191 cmd.num_params = 1; 192 cmd.param.id = param->id; 193 cmd.param.len = param->len; 194 memcpy(cmd.param.val, param->val, param->len); 195 196 nci_send_cmd(ndev, NCI_OP_CORE_SET_CONFIG_CMD, (3 + param->len), &cmd); 197} 198 199static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt) 200{ 201 struct nci_rf_disc_cmd cmd; 202 __u32 protocols = opt; 203 204 cmd.num_disc_configs = 0; 205 206 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 207 (protocols & NFC_PROTO_JEWEL_MASK || 208 protocols & NFC_PROTO_MIFARE_MASK || 209 protocols & NFC_PROTO_ISO14443_MASK || 210 protocols & NFC_PROTO_NFC_DEP_MASK)) { 211 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 212 NCI_NFC_A_PASSIVE_POLL_MODE; 213 cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 214 cmd.num_disc_configs++; 215 } 216 217 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 218 (protocols & NFC_PROTO_ISO14443_B_MASK)) { 219 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 220 NCI_NFC_B_PASSIVE_POLL_MODE; 221 cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 222 cmd.num_disc_configs++; 223 } 224 225 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 226 (protocols & NFC_PROTO_FELICA_MASK || 227 protocols & NFC_PROTO_NFC_DEP_MASK)) { 228 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 229 NCI_NFC_F_PASSIVE_POLL_MODE; 230 cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 231 cmd.num_disc_configs++; 232 } 233 234 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 235 (protocols & NFC_PROTO_ISO15693_MASK)) { 236 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 237 NCI_NFC_V_PASSIVE_POLL_MODE; 238 cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 239 cmd.num_disc_configs++; 240 } 241 242 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD, 243 (1 + (cmd.num_disc_configs * sizeof(struct disc_config))), 244 &cmd); 245} 246 247struct nci_rf_discover_select_param { 248 __u8 rf_discovery_id; 249 __u8 rf_protocol; 250}; 251 252static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt) 253{ 254 struct nci_rf_discover_select_param *param = 255 (struct nci_rf_discover_select_param *)opt; 256 struct nci_rf_discover_select_cmd cmd; 257 258 cmd.rf_discovery_id = param->rf_discovery_id; 259 cmd.rf_protocol = param->rf_protocol; 260 261 switch (cmd.rf_protocol) { 262 case NCI_RF_PROTOCOL_ISO_DEP: 263 cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP; 264 break; 265 266 case NCI_RF_PROTOCOL_NFC_DEP: 267 cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP; 268 break; 269 270 default: 271 cmd.rf_interface = NCI_RF_INTERFACE_FRAME; 272 break; 273 } 274 275 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD, 276 sizeof(struct nci_rf_discover_select_cmd), &cmd); 277} 278 279static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt) 280{ 281 struct nci_rf_deactivate_cmd cmd; 282 283 cmd.type = NCI_DEACTIVATE_TYPE_IDLE_MODE; 284 285 nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD, 286 sizeof(struct nci_rf_deactivate_cmd), &cmd); 287} 288 289static int nci_open_device(struct nci_dev *ndev) 290{ 291 int rc = 0; 292 293 mutex_lock(&ndev->req_lock); 294 295 if (test_bit(NCI_UP, &ndev->flags)) { 296 rc = -EALREADY; 297 goto done; 298 } 299 300 if (ndev->ops->open(ndev)) { 301 rc = -EIO; 302 goto done; 303 } 304 305 atomic_set(&ndev->cmd_cnt, 1); 306 307 set_bit(NCI_INIT, &ndev->flags); 308 309 rc = __nci_request(ndev, nci_reset_req, 0, 310 msecs_to_jiffies(NCI_RESET_TIMEOUT)); 311 312 if (ndev->ops->setup) 313 ndev->ops->setup(ndev); 314 315 if (!rc) { 316 rc = __nci_request(ndev, nci_init_req, 0, 317 msecs_to_jiffies(NCI_INIT_TIMEOUT)); 318 } 319 320 if (!rc) { 321 rc = __nci_request(ndev, nci_init_complete_req, 0, 322 msecs_to_jiffies(NCI_INIT_TIMEOUT)); 323 } 324 325 clear_bit(NCI_INIT, &ndev->flags); 326 327 if (!rc) { 328 set_bit(NCI_UP, &ndev->flags); 329 nci_clear_target_list(ndev); 330 atomic_set(&ndev->state, NCI_IDLE); 331 } else { 332 /* Init failed, cleanup */ 333 skb_queue_purge(&ndev->cmd_q); 334 skb_queue_purge(&ndev->rx_q); 335 skb_queue_purge(&ndev->tx_q); 336 337 ndev->ops->close(ndev); 338 ndev->flags = 0; 339 } 340 341done: 342 mutex_unlock(&ndev->req_lock); 343 return rc; 344} 345 346static int nci_close_device(struct nci_dev *ndev) 347{ 348 nci_req_cancel(ndev, ENODEV); 349 mutex_lock(&ndev->req_lock); 350 351 if (!test_and_clear_bit(NCI_UP, &ndev->flags)) { 352 del_timer_sync(&ndev->cmd_timer); 353 del_timer_sync(&ndev->data_timer); 354 mutex_unlock(&ndev->req_lock); 355 return 0; 356 } 357 358 /* Drop RX and TX queues */ 359 skb_queue_purge(&ndev->rx_q); 360 skb_queue_purge(&ndev->tx_q); 361 362 /* Flush RX and TX wq */ 363 flush_workqueue(ndev->rx_wq); 364 flush_workqueue(ndev->tx_wq); 365 366 /* Reset device */ 367 skb_queue_purge(&ndev->cmd_q); 368 atomic_set(&ndev->cmd_cnt, 1); 369 370 set_bit(NCI_INIT, &ndev->flags); 371 __nci_request(ndev, nci_reset_req, 0, 372 msecs_to_jiffies(NCI_RESET_TIMEOUT)); 373 clear_bit(NCI_INIT, &ndev->flags); 374 375 del_timer_sync(&ndev->cmd_timer); 376 377 /* Flush cmd wq */ 378 flush_workqueue(ndev->cmd_wq); 379 380 /* After this point our queues are empty 381 * and no works are scheduled. */ 382 ndev->ops->close(ndev); 383 384 /* Clear flags */ 385 ndev->flags = 0; 386 387 mutex_unlock(&ndev->req_lock); 388 389 return 0; 390} 391 392/* NCI command timer function */ 393static void nci_cmd_timer(unsigned long arg) 394{ 395 struct nci_dev *ndev = (void *) arg; 396 397 atomic_set(&ndev->cmd_cnt, 1); 398 queue_work(ndev->cmd_wq, &ndev->cmd_work); 399} 400 401/* NCI data exchange timer function */ 402static void nci_data_timer(unsigned long arg) 403{ 404 struct nci_dev *ndev = (void *) arg; 405 406 set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); 407 queue_work(ndev->rx_wq, &ndev->rx_work); 408} 409 410static int nci_dev_up(struct nfc_dev *nfc_dev) 411{ 412 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 413 414 return nci_open_device(ndev); 415} 416 417static int nci_dev_down(struct nfc_dev *nfc_dev) 418{ 419 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 420 421 return nci_close_device(ndev); 422} 423 424int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, __u8 *val) 425{ 426 struct nci_set_config_param param; 427 428 if (!val || !len) 429 return 0; 430 431 param.id = id; 432 param.len = len; 433 param.val = val; 434 435 return __nci_request(ndev, nci_set_config_req, (unsigned long)¶m, 436 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT)); 437} 438EXPORT_SYMBOL(nci_set_config); 439 440static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev) 441{ 442 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 443 struct nci_set_config_param param; 444 445 param.val = nfc_get_local_general_bytes(nfc_dev, ¶m.len); 446 if ((param.val == NULL) || (param.len == 0)) 447 return 0; 448 449 if (param.len > NFC_MAX_GT_LEN) 450 return -EINVAL; 451 452 param.id = NCI_PN_ATR_REQ_GEN_BYTES; 453 454 return nci_request(ndev, nci_set_config_req, (unsigned long)¶m, 455 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT)); 456} 457 458static int nci_start_poll(struct nfc_dev *nfc_dev, 459 __u32 im_protocols, __u32 tm_protocols) 460{ 461 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 462 int rc; 463 464 if ((atomic_read(&ndev->state) == NCI_DISCOVERY) || 465 (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) { 466 pr_err("unable to start poll, since poll is already active\n"); 467 return -EBUSY; 468 } 469 470 if (ndev->target_active_prot) { 471 pr_err("there is an active target\n"); 472 return -EBUSY; 473 } 474 475 if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) || 476 (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) { 477 pr_debug("target active or w4 select, implicitly deactivate\n"); 478 479 rc = nci_request(ndev, nci_rf_deactivate_req, 0, 480 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 481 if (rc) 482 return -EBUSY; 483 } 484 485 if (im_protocols & NFC_PROTO_NFC_DEP_MASK) { 486 rc = nci_set_local_general_bytes(nfc_dev); 487 if (rc) { 488 pr_err("failed to set local general bytes\n"); 489 return rc; 490 } 491 } 492 493 rc = nci_request(ndev, nci_rf_discover_req, im_protocols, 494 msecs_to_jiffies(NCI_RF_DISC_TIMEOUT)); 495 496 if (!rc) 497 ndev->poll_prots = im_protocols; 498 499 return rc; 500} 501 502static void nci_stop_poll(struct nfc_dev *nfc_dev) 503{ 504 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 505 506 if ((atomic_read(&ndev->state) != NCI_DISCOVERY) && 507 (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) { 508 pr_err("unable to stop poll, since poll is not active\n"); 509 return; 510 } 511 512 nci_request(ndev, nci_rf_deactivate_req, 0, 513 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 514} 515 516static int nci_activate_target(struct nfc_dev *nfc_dev, 517 struct nfc_target *target, __u32 protocol) 518{ 519 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 520 struct nci_rf_discover_select_param param; 521 struct nfc_target *nci_target = NULL; 522 int i; 523 int rc = 0; 524 525 pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol); 526 527 if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) && 528 (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) { 529 pr_err("there is no available target to activate\n"); 530 return -EINVAL; 531 } 532 533 if (ndev->target_active_prot) { 534 pr_err("there is already an active target\n"); 535 return -EBUSY; 536 } 537 538 for (i = 0; i < ndev->n_targets; i++) { 539 if (ndev->targets[i].idx == target->idx) { 540 nci_target = &ndev->targets[i]; 541 break; 542 } 543 } 544 545 if (!nci_target) { 546 pr_err("unable to find the selected target\n"); 547 return -EINVAL; 548 } 549 550 if (!(nci_target->supported_protocols & (1 << protocol))) { 551 pr_err("target does not support the requested protocol 0x%x\n", 552 protocol); 553 return -EINVAL; 554 } 555 556 if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) { 557 param.rf_discovery_id = nci_target->logical_idx; 558 559 if (protocol == NFC_PROTO_JEWEL) 560 param.rf_protocol = NCI_RF_PROTOCOL_T1T; 561 else if (protocol == NFC_PROTO_MIFARE) 562 param.rf_protocol = NCI_RF_PROTOCOL_T2T; 563 else if (protocol == NFC_PROTO_FELICA) 564 param.rf_protocol = NCI_RF_PROTOCOL_T3T; 565 else if (protocol == NFC_PROTO_ISO14443 || 566 protocol == NFC_PROTO_ISO14443_B) 567 param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP; 568 else 569 param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP; 570 571 rc = nci_request(ndev, nci_rf_discover_select_req, 572 (unsigned long)¶m, 573 msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT)); 574 } 575 576 if (!rc) 577 ndev->target_active_prot = protocol; 578 579 return rc; 580} 581 582static void nci_deactivate_target(struct nfc_dev *nfc_dev, 583 struct nfc_target *target) 584{ 585 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 586 587 pr_debug("entry\n"); 588 589 if (!ndev->target_active_prot) { 590 pr_err("unable to deactivate target, no active target\n"); 591 return; 592 } 593 594 ndev->target_active_prot = 0; 595 596 if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) { 597 nci_request(ndev, nci_rf_deactivate_req, 0, 598 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 599 } 600} 601 602static int nci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target, 603 __u8 comm_mode, __u8 *gb, size_t gb_len) 604{ 605 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 606 int rc; 607 608 pr_debug("target_idx %d, comm_mode %d\n", target->idx, comm_mode); 609 610 rc = nci_activate_target(nfc_dev, target, NFC_PROTO_NFC_DEP); 611 if (rc) 612 return rc; 613 614 rc = nfc_set_remote_general_bytes(nfc_dev, ndev->remote_gb, 615 ndev->remote_gb_len); 616 if (!rc) 617 rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_PASSIVE, 618 NFC_RF_INITIATOR); 619 620 return rc; 621} 622 623static int nci_dep_link_down(struct nfc_dev *nfc_dev) 624{ 625 pr_debug("entry\n"); 626 627 nci_deactivate_target(nfc_dev, NULL); 628 629 return 0; 630} 631 632 633static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target, 634 struct sk_buff *skb, 635 data_exchange_cb_t cb, void *cb_context) 636{ 637 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 638 int rc; 639 640 pr_debug("target_idx %d, len %d\n", target->idx, skb->len); 641 642 if (!ndev->target_active_prot) { 643 pr_err("unable to exchange data, no active target\n"); 644 return -EINVAL; 645 } 646 647 if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 648 return -EBUSY; 649 650 /* store cb and context to be used on receiving data */ 651 ndev->data_exchange_cb = cb; 652 ndev->data_exchange_cb_context = cb_context; 653 654 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb); 655 if (rc) 656 clear_bit(NCI_DATA_EXCHANGE, &ndev->flags); 657 658 return rc; 659} 660 661static int nci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx) 662{ 663 return 0; 664} 665 666static int nci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx) 667{ 668 return 0; 669} 670 671static int nci_discover_se(struct nfc_dev *nfc_dev) 672{ 673 return 0; 674} 675 676static struct nfc_ops nci_nfc_ops = { 677 .dev_up = nci_dev_up, 678 .dev_down = nci_dev_down, 679 .start_poll = nci_start_poll, 680 .stop_poll = nci_stop_poll, 681 .dep_link_up = nci_dep_link_up, 682 .dep_link_down = nci_dep_link_down, 683 .activate_target = nci_activate_target, 684 .deactivate_target = nci_deactivate_target, 685 .im_transceive = nci_transceive, 686 .enable_se = nci_enable_se, 687 .disable_se = nci_disable_se, 688 .discover_se = nci_discover_se, 689}; 690 691/* ---- Interface to NCI drivers ---- */ 692 693/** 694 * nci_allocate_device - allocate a new nci device 695 * 696 * @ops: device operations 697 * @supported_protocols: NFC protocols supported by the device 698 */ 699struct nci_dev *nci_allocate_device(struct nci_ops *ops, 700 __u32 supported_protocols, 701 int tx_headroom, int tx_tailroom) 702{ 703 struct nci_dev *ndev; 704 705 pr_debug("supported_protocols 0x%x\n", supported_protocols); 706 707 if (!ops->open || !ops->close || !ops->send) 708 return NULL; 709 710 if (!supported_protocols) 711 return NULL; 712 713 ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL); 714 if (!ndev) 715 return NULL; 716 717 ndev->ops = ops; 718 ndev->tx_headroom = tx_headroom; 719 ndev->tx_tailroom = tx_tailroom; 720 init_completion(&ndev->req_completion); 721 722 ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops, 723 supported_protocols, 724 tx_headroom + NCI_DATA_HDR_SIZE, 725 tx_tailroom); 726 if (!ndev->nfc_dev) 727 goto free_exit; 728 729 nfc_set_drvdata(ndev->nfc_dev, ndev); 730 731 return ndev; 732 733free_exit: 734 kfree(ndev); 735 return NULL; 736} 737EXPORT_SYMBOL(nci_allocate_device); 738 739/** 740 * nci_free_device - deallocate nci device 741 * 742 * @ndev: The nci device to deallocate 743 */ 744void nci_free_device(struct nci_dev *ndev) 745{ 746 nfc_free_device(ndev->nfc_dev); 747 kfree(ndev); 748} 749EXPORT_SYMBOL(nci_free_device); 750 751/** 752 * nci_register_device - register a nci device in the nfc subsystem 753 * 754 * @dev: The nci device to register 755 */ 756int nci_register_device(struct nci_dev *ndev) 757{ 758 int rc; 759 struct device *dev = &ndev->nfc_dev->dev; 760 char name[32]; 761 762 ndev->flags = 0; 763 764 INIT_WORK(&ndev->cmd_work, nci_cmd_work); 765 snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev)); 766 ndev->cmd_wq = create_singlethread_workqueue(name); 767 if (!ndev->cmd_wq) { 768 rc = -ENOMEM; 769 goto exit; 770 } 771 772 INIT_WORK(&ndev->rx_work, nci_rx_work); 773 snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev)); 774 ndev->rx_wq = create_singlethread_workqueue(name); 775 if (!ndev->rx_wq) { 776 rc = -ENOMEM; 777 goto destroy_cmd_wq_exit; 778 } 779 780 INIT_WORK(&ndev->tx_work, nci_tx_work); 781 snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev)); 782 ndev->tx_wq = create_singlethread_workqueue(name); 783 if (!ndev->tx_wq) { 784 rc = -ENOMEM; 785 goto destroy_rx_wq_exit; 786 } 787 788 skb_queue_head_init(&ndev->cmd_q); 789 skb_queue_head_init(&ndev->rx_q); 790 skb_queue_head_init(&ndev->tx_q); 791 792 setup_timer(&ndev->cmd_timer, nci_cmd_timer, 793 (unsigned long) ndev); 794 setup_timer(&ndev->data_timer, nci_data_timer, 795 (unsigned long) ndev); 796 797 mutex_init(&ndev->req_lock); 798 799 rc = nfc_register_device(ndev->nfc_dev); 800 if (rc) 801 goto destroy_rx_wq_exit; 802 803 goto exit; 804 805destroy_rx_wq_exit: 806 destroy_workqueue(ndev->rx_wq); 807 808destroy_cmd_wq_exit: 809 destroy_workqueue(ndev->cmd_wq); 810 811exit: 812 return rc; 813} 814EXPORT_SYMBOL(nci_register_device); 815 816/** 817 * nci_unregister_device - unregister a nci device in the nfc subsystem 818 * 819 * @dev: The nci device to unregister 820 */ 821void nci_unregister_device(struct nci_dev *ndev) 822{ 823 nci_close_device(ndev); 824 825 destroy_workqueue(ndev->cmd_wq); 826 destroy_workqueue(ndev->rx_wq); 827 destroy_workqueue(ndev->tx_wq); 828 829 nfc_unregister_device(ndev->nfc_dev); 830} 831EXPORT_SYMBOL(nci_unregister_device); 832 833/** 834 * nci_recv_frame - receive frame from NCI drivers 835 * 836 * @ndev: The nci device 837 * @skb: The sk_buff to receive 838 */ 839int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb) 840{ 841 pr_debug("len %d\n", skb->len); 842 843 if (!ndev || (!test_bit(NCI_UP, &ndev->flags) && 844 !test_bit(NCI_INIT, &ndev->flags))) { 845 kfree_skb(skb); 846 return -ENXIO; 847 } 848 849 /* Queue frame for rx worker thread */ 850 skb_queue_tail(&ndev->rx_q, skb); 851 queue_work(ndev->rx_wq, &ndev->rx_work); 852 853 return 0; 854} 855EXPORT_SYMBOL(nci_recv_frame); 856 857static int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb) 858{ 859 pr_debug("len %d\n", skb->len); 860 861 if (!ndev) { 862 kfree_skb(skb); 863 return -ENODEV; 864 } 865 866 /* Get rid of skb owner, prior to sending to the driver. */ 867 skb_orphan(skb); 868 869 /* Send copy to sniffer */ 870 nfc_send_to_raw_sock(ndev->nfc_dev, skb, 871 RAW_PAYLOAD_NCI, NFC_DIRECTION_TX); 872 873 return ndev->ops->send(ndev, skb); 874} 875 876/* Send NCI command */ 877int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload) 878{ 879 struct nci_ctrl_hdr *hdr; 880 struct sk_buff *skb; 881 882 pr_debug("opcode 0x%x, plen %d\n", opcode, plen); 883 884 skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL); 885 if (!skb) { 886 pr_err("no memory for command\n"); 887 return -ENOMEM; 888 } 889 890 hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE); 891 hdr->gid = nci_opcode_gid(opcode); 892 hdr->oid = nci_opcode_oid(opcode); 893 hdr->plen = plen; 894 895 nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT); 896 nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST); 897 898 if (plen) 899 memcpy(skb_put(skb, plen), payload, plen); 900 901 skb_queue_tail(&ndev->cmd_q, skb); 902 queue_work(ndev->cmd_wq, &ndev->cmd_work); 903 904 return 0; 905} 906 907/* ---- NCI TX Data worker thread ---- */ 908 909static void nci_tx_work(struct work_struct *work) 910{ 911 struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work); 912 struct sk_buff *skb; 913 914 pr_debug("credits_cnt %d\n", atomic_read(&ndev->credits_cnt)); 915 916 /* Send queued tx data */ 917 while (atomic_read(&ndev->credits_cnt)) { 918 skb = skb_dequeue(&ndev->tx_q); 919 if (!skb) 920 return; 921 922 /* Check if data flow control is used */ 923 if (atomic_read(&ndev->credits_cnt) != 924 NCI_DATA_FLOW_CONTROL_NOT_USED) 925 atomic_dec(&ndev->credits_cnt); 926 927 pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n", 928 nci_pbf(skb->data), 929 nci_conn_id(skb->data), 930 nci_plen(skb->data)); 931 932 nci_send_frame(ndev, skb); 933 934 mod_timer(&ndev->data_timer, 935 jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT)); 936 } 937} 938 939/* ----- NCI RX worker thread (data & control) ----- */ 940 941static void nci_rx_work(struct work_struct *work) 942{ 943 struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work); 944 struct sk_buff *skb; 945 946 while ((skb = skb_dequeue(&ndev->rx_q))) { 947 948 /* Send copy to sniffer */ 949 nfc_send_to_raw_sock(ndev->nfc_dev, skb, 950 RAW_PAYLOAD_NCI, NFC_DIRECTION_RX); 951 952 /* Process frame */ 953 switch (nci_mt(skb->data)) { 954 case NCI_MT_RSP_PKT: 955 nci_rsp_packet(ndev, skb); 956 break; 957 958 case NCI_MT_NTF_PKT: 959 nci_ntf_packet(ndev, skb); 960 break; 961 962 case NCI_MT_DATA_PKT: 963 nci_rx_data_packet(ndev, skb); 964 break; 965 966 default: 967 pr_err("unknown MT 0x%x\n", nci_mt(skb->data)); 968 kfree_skb(skb); 969 break; 970 } 971 } 972 973 /* check if a data exchange timout has occurred */ 974 if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) { 975 /* complete the data exchange transaction, if exists */ 976 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 977 nci_data_exchange_complete(ndev, NULL, -ETIMEDOUT); 978 979 clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); 980 } 981} 982 983/* ----- NCI TX CMD worker thread ----- */ 984 985static void nci_cmd_work(struct work_struct *work) 986{ 987 struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work); 988 struct sk_buff *skb; 989 990 pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt)); 991 992 /* Send queued command */ 993 if (atomic_read(&ndev->cmd_cnt)) { 994 skb = skb_dequeue(&ndev->cmd_q); 995 if (!skb) 996 return; 997 998 atomic_dec(&ndev->cmd_cnt); 999 1000 pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n", 1001 nci_pbf(skb->data), 1002 nci_opcode_gid(nci_opcode(skb->data)), 1003 nci_opcode_oid(nci_opcode(skb->data)), 1004 nci_plen(skb->data)); 1005 1006 nci_send_frame(ndev, skb); 1007 1008 mod_timer(&ndev->cmd_timer, 1009 jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT)); 1010 } 1011} 1012 1013MODULE_LICENSE("GPL"); 1014