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 * Copyright (C) 2014 Marvell International Ltd. 7 * 8 * Written by Ilan Elias <ilane@ti.com> 9 * 10 * Acknowledgements: 11 * This file is based on hci_core.c, which was written 12 * by Maxim Krasnyansky. 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License version 2 16 * as published by the Free Software Foundation 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program; if not, see <http://www.gnu.org/licenses/>. 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 reinit_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 struct nci_set_config_param { 180 __u8 id; 181 size_t len; 182 __u8 *val; 183 }; 184 185 static void nci_set_config_req(struct nci_dev *ndev, unsigned long opt) 186 { 187 struct nci_set_config_param *param = (struct nci_set_config_param *)opt; 188 struct nci_core_set_config_cmd cmd; 189 190 BUG_ON(param->len > NCI_MAX_PARAM_LEN); 191 192 cmd.num_params = 1; 193 cmd.param.id = param->id; 194 cmd.param.len = param->len; 195 memcpy(cmd.param.val, param->val, param->len); 196 197 nci_send_cmd(ndev, NCI_OP_CORE_SET_CONFIG_CMD, (3 + param->len), &cmd); 198 } 199 200 struct nci_rf_discover_param { 201 __u32 im_protocols; 202 __u32 tm_protocols; 203 }; 204 205 static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt) 206 { 207 struct nci_rf_discover_param *param = 208 (struct nci_rf_discover_param *)opt; 209 struct nci_rf_disc_cmd cmd; 210 211 cmd.num_disc_configs = 0; 212 213 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 214 (param->im_protocols & NFC_PROTO_JEWEL_MASK || 215 param->im_protocols & NFC_PROTO_MIFARE_MASK || 216 param->im_protocols & NFC_PROTO_ISO14443_MASK || 217 param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) { 218 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 219 NCI_NFC_A_PASSIVE_POLL_MODE; 220 cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 221 cmd.num_disc_configs++; 222 } 223 224 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 225 (param->im_protocols & NFC_PROTO_ISO14443_B_MASK)) { 226 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 227 NCI_NFC_B_PASSIVE_POLL_MODE; 228 cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 229 cmd.num_disc_configs++; 230 } 231 232 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 233 (param->im_protocols & NFC_PROTO_FELICA_MASK || 234 param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) { 235 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 236 NCI_NFC_F_PASSIVE_POLL_MODE; 237 cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 238 cmd.num_disc_configs++; 239 } 240 241 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 242 (param->im_protocols & NFC_PROTO_ISO15693_MASK)) { 243 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 244 NCI_NFC_V_PASSIVE_POLL_MODE; 245 cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 246 cmd.num_disc_configs++; 247 } 248 249 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS - 1) && 250 (param->tm_protocols & NFC_PROTO_NFC_DEP_MASK)) { 251 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 252 NCI_NFC_A_PASSIVE_LISTEN_MODE; 253 cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 254 cmd.num_disc_configs++; 255 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 256 NCI_NFC_F_PASSIVE_LISTEN_MODE; 257 cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 258 cmd.num_disc_configs++; 259 } 260 261 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD, 262 (1 + (cmd.num_disc_configs * sizeof(struct disc_config))), 263 &cmd); 264 } 265 266 struct nci_rf_discover_select_param { 267 __u8 rf_discovery_id; 268 __u8 rf_protocol; 269 }; 270 271 static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt) 272 { 273 struct nci_rf_discover_select_param *param = 274 (struct nci_rf_discover_select_param *)opt; 275 struct nci_rf_discover_select_cmd cmd; 276 277 cmd.rf_discovery_id = param->rf_discovery_id; 278 cmd.rf_protocol = param->rf_protocol; 279 280 switch (cmd.rf_protocol) { 281 case NCI_RF_PROTOCOL_ISO_DEP: 282 cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP; 283 break; 284 285 case NCI_RF_PROTOCOL_NFC_DEP: 286 cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP; 287 break; 288 289 default: 290 cmd.rf_interface = NCI_RF_INTERFACE_FRAME; 291 break; 292 } 293 294 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD, 295 sizeof(struct nci_rf_discover_select_cmd), &cmd); 296 } 297 298 static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt) 299 { 300 struct nci_rf_deactivate_cmd cmd; 301 302 cmd.type = opt; 303 304 nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD, 305 sizeof(struct nci_rf_deactivate_cmd), &cmd); 306 } 307 308 static int nci_open_device(struct nci_dev *ndev) 309 { 310 int rc = 0; 311 312 mutex_lock(&ndev->req_lock); 313 314 if (test_bit(NCI_UP, &ndev->flags)) { 315 rc = -EALREADY; 316 goto done; 317 } 318 319 if (ndev->ops->open(ndev)) { 320 rc = -EIO; 321 goto done; 322 } 323 324 atomic_set(&ndev->cmd_cnt, 1); 325 326 set_bit(NCI_INIT, &ndev->flags); 327 328 rc = __nci_request(ndev, nci_reset_req, 0, 329 msecs_to_jiffies(NCI_RESET_TIMEOUT)); 330 331 if (ndev->ops->setup) 332 ndev->ops->setup(ndev); 333 334 if (!rc) { 335 rc = __nci_request(ndev, nci_init_req, 0, 336 msecs_to_jiffies(NCI_INIT_TIMEOUT)); 337 } 338 339 if (!rc) { 340 rc = __nci_request(ndev, nci_init_complete_req, 0, 341 msecs_to_jiffies(NCI_INIT_TIMEOUT)); 342 } 343 344 clear_bit(NCI_INIT, &ndev->flags); 345 346 if (!rc) { 347 set_bit(NCI_UP, &ndev->flags); 348 nci_clear_target_list(ndev); 349 atomic_set(&ndev->state, NCI_IDLE); 350 } else { 351 /* Init failed, cleanup */ 352 skb_queue_purge(&ndev->cmd_q); 353 skb_queue_purge(&ndev->rx_q); 354 skb_queue_purge(&ndev->tx_q); 355 356 ndev->ops->close(ndev); 357 ndev->flags = 0; 358 } 359 360 done: 361 mutex_unlock(&ndev->req_lock); 362 return rc; 363 } 364 365 static int nci_close_device(struct nci_dev *ndev) 366 { 367 nci_req_cancel(ndev, ENODEV); 368 mutex_lock(&ndev->req_lock); 369 370 if (!test_and_clear_bit(NCI_UP, &ndev->flags)) { 371 del_timer_sync(&ndev->cmd_timer); 372 del_timer_sync(&ndev->data_timer); 373 mutex_unlock(&ndev->req_lock); 374 return 0; 375 } 376 377 /* Drop RX and TX queues */ 378 skb_queue_purge(&ndev->rx_q); 379 skb_queue_purge(&ndev->tx_q); 380 381 /* Flush RX and TX wq */ 382 flush_workqueue(ndev->rx_wq); 383 flush_workqueue(ndev->tx_wq); 384 385 /* Reset device */ 386 skb_queue_purge(&ndev->cmd_q); 387 atomic_set(&ndev->cmd_cnt, 1); 388 389 set_bit(NCI_INIT, &ndev->flags); 390 __nci_request(ndev, nci_reset_req, 0, 391 msecs_to_jiffies(NCI_RESET_TIMEOUT)); 392 clear_bit(NCI_INIT, &ndev->flags); 393 394 del_timer_sync(&ndev->cmd_timer); 395 396 /* Flush cmd wq */ 397 flush_workqueue(ndev->cmd_wq); 398 399 /* After this point our queues are empty 400 * and no works are scheduled. */ 401 ndev->ops->close(ndev); 402 403 /* Clear flags */ 404 ndev->flags = 0; 405 406 mutex_unlock(&ndev->req_lock); 407 408 return 0; 409 } 410 411 /* NCI command timer function */ 412 static void nci_cmd_timer(unsigned long arg) 413 { 414 struct nci_dev *ndev = (void *) arg; 415 416 atomic_set(&ndev->cmd_cnt, 1); 417 queue_work(ndev->cmd_wq, &ndev->cmd_work); 418 } 419 420 /* NCI data exchange timer function */ 421 static void nci_data_timer(unsigned long arg) 422 { 423 struct nci_dev *ndev = (void *) arg; 424 425 set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); 426 queue_work(ndev->rx_wq, &ndev->rx_work); 427 } 428 429 static int nci_dev_up(struct nfc_dev *nfc_dev) 430 { 431 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 432 433 return nci_open_device(ndev); 434 } 435 436 static int nci_dev_down(struct nfc_dev *nfc_dev) 437 { 438 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 439 440 return nci_close_device(ndev); 441 } 442 443 int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, __u8 *val) 444 { 445 struct nci_set_config_param param; 446 447 if (!val || !len) 448 return 0; 449 450 param.id = id; 451 param.len = len; 452 param.val = val; 453 454 return __nci_request(ndev, nci_set_config_req, (unsigned long)¶m, 455 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT)); 456 } 457 EXPORT_SYMBOL(nci_set_config); 458 459 static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev) 460 { 461 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 462 struct nci_set_config_param param; 463 int rc; 464 465 param.val = nfc_get_local_general_bytes(nfc_dev, ¶m.len); 466 if ((param.val == NULL) || (param.len == 0)) 467 return 0; 468 469 if (param.len > NFC_MAX_GT_LEN) 470 return -EINVAL; 471 472 param.id = NCI_PN_ATR_REQ_GEN_BYTES; 473 474 rc = nci_request(ndev, nci_set_config_req, (unsigned long)¶m, 475 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT)); 476 if (rc) 477 return rc; 478 479 param.id = NCI_LN_ATR_RES_GEN_BYTES; 480 481 return nci_request(ndev, nci_set_config_req, (unsigned long)¶m, 482 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT)); 483 } 484 485 static int nci_set_listen_parameters(struct nfc_dev *nfc_dev) 486 { 487 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 488 int rc; 489 __u8 val; 490 491 val = NCI_LA_SEL_INFO_NFC_DEP_MASK; 492 493 rc = nci_set_config(ndev, NCI_LA_SEL_INFO, 1, &val); 494 if (rc) 495 return rc; 496 497 val = NCI_LF_PROTOCOL_TYPE_NFC_DEP_MASK; 498 499 rc = nci_set_config(ndev, NCI_LF_PROTOCOL_TYPE, 1, &val); 500 if (rc) 501 return rc; 502 503 val = NCI_LF_CON_BITR_F_212 | NCI_LF_CON_BITR_F_424; 504 505 return nci_set_config(ndev, NCI_LF_CON_BITR_F, 1, &val); 506 } 507 508 static int nci_start_poll(struct nfc_dev *nfc_dev, 509 __u32 im_protocols, __u32 tm_protocols) 510 { 511 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 512 struct nci_rf_discover_param param; 513 int rc; 514 515 if ((atomic_read(&ndev->state) == NCI_DISCOVERY) || 516 (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) { 517 pr_err("unable to start poll, since poll is already active\n"); 518 return -EBUSY; 519 } 520 521 if (ndev->target_active_prot) { 522 pr_err("there is an active target\n"); 523 return -EBUSY; 524 } 525 526 if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) || 527 (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) { 528 pr_debug("target active or w4 select, implicitly deactivate\n"); 529 530 rc = nci_request(ndev, nci_rf_deactivate_req, 531 NCI_DEACTIVATE_TYPE_IDLE_MODE, 532 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 533 if (rc) 534 return -EBUSY; 535 } 536 537 if ((im_protocols | tm_protocols) & NFC_PROTO_NFC_DEP_MASK) { 538 rc = nci_set_local_general_bytes(nfc_dev); 539 if (rc) { 540 pr_err("failed to set local general bytes\n"); 541 return rc; 542 } 543 } 544 545 if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) { 546 rc = nci_set_listen_parameters(nfc_dev); 547 if (rc) 548 pr_err("failed to set listen parameters\n"); 549 } 550 551 param.im_protocols = im_protocols; 552 param.tm_protocols = tm_protocols; 553 rc = nci_request(ndev, nci_rf_discover_req, (unsigned long)¶m, 554 msecs_to_jiffies(NCI_RF_DISC_TIMEOUT)); 555 556 if (!rc) 557 ndev->poll_prots = im_protocols; 558 559 return rc; 560 } 561 562 static void nci_stop_poll(struct nfc_dev *nfc_dev) 563 { 564 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 565 566 if ((atomic_read(&ndev->state) != NCI_DISCOVERY) && 567 (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) { 568 pr_err("unable to stop poll, since poll is not active\n"); 569 return; 570 } 571 572 nci_request(ndev, nci_rf_deactivate_req, NCI_DEACTIVATE_TYPE_IDLE_MODE, 573 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 574 } 575 576 static int nci_activate_target(struct nfc_dev *nfc_dev, 577 struct nfc_target *target, __u32 protocol) 578 { 579 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 580 struct nci_rf_discover_select_param param; 581 struct nfc_target *nci_target = NULL; 582 int i; 583 int rc = 0; 584 585 pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol); 586 587 if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) && 588 (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) { 589 pr_err("there is no available target to activate\n"); 590 return -EINVAL; 591 } 592 593 if (ndev->target_active_prot) { 594 pr_err("there is already an active target\n"); 595 return -EBUSY; 596 } 597 598 for (i = 0; i < ndev->n_targets; i++) { 599 if (ndev->targets[i].idx == target->idx) { 600 nci_target = &ndev->targets[i]; 601 break; 602 } 603 } 604 605 if (!nci_target) { 606 pr_err("unable to find the selected target\n"); 607 return -EINVAL; 608 } 609 610 if (!(nci_target->supported_protocols & (1 << protocol))) { 611 pr_err("target does not support the requested protocol 0x%x\n", 612 protocol); 613 return -EINVAL; 614 } 615 616 if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) { 617 param.rf_discovery_id = nci_target->logical_idx; 618 619 if (protocol == NFC_PROTO_JEWEL) 620 param.rf_protocol = NCI_RF_PROTOCOL_T1T; 621 else if (protocol == NFC_PROTO_MIFARE) 622 param.rf_protocol = NCI_RF_PROTOCOL_T2T; 623 else if (protocol == NFC_PROTO_FELICA) 624 param.rf_protocol = NCI_RF_PROTOCOL_T3T; 625 else if (protocol == NFC_PROTO_ISO14443 || 626 protocol == NFC_PROTO_ISO14443_B) 627 param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP; 628 else 629 param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP; 630 631 rc = nci_request(ndev, nci_rf_discover_select_req, 632 (unsigned long)¶m, 633 msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT)); 634 } 635 636 if (!rc) 637 ndev->target_active_prot = protocol; 638 639 return rc; 640 } 641 642 static void nci_deactivate_target(struct nfc_dev *nfc_dev, 643 struct nfc_target *target) 644 { 645 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 646 647 pr_debug("entry\n"); 648 649 if (!ndev->target_active_prot) { 650 pr_err("unable to deactivate target, no active target\n"); 651 return; 652 } 653 654 ndev->target_active_prot = 0; 655 656 if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) { 657 nci_request(ndev, nci_rf_deactivate_req, 658 NCI_DEACTIVATE_TYPE_SLEEP_MODE, 659 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 660 } 661 } 662 663 static int nci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target, 664 __u8 comm_mode, __u8 *gb, size_t gb_len) 665 { 666 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 667 int rc; 668 669 pr_debug("target_idx %d, comm_mode %d\n", target->idx, comm_mode); 670 671 rc = nci_activate_target(nfc_dev, target, NFC_PROTO_NFC_DEP); 672 if (rc) 673 return rc; 674 675 rc = nfc_set_remote_general_bytes(nfc_dev, ndev->remote_gb, 676 ndev->remote_gb_len); 677 if (!rc) 678 rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_PASSIVE, 679 NFC_RF_INITIATOR); 680 681 return rc; 682 } 683 684 static int nci_dep_link_down(struct nfc_dev *nfc_dev) 685 { 686 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 687 int rc; 688 689 pr_debug("entry\n"); 690 691 if (nfc_dev->rf_mode == NFC_RF_INITIATOR) { 692 nci_deactivate_target(nfc_dev, NULL); 693 } else { 694 if (atomic_read(&ndev->state) == NCI_LISTEN_ACTIVE || 695 atomic_read(&ndev->state) == NCI_DISCOVERY) { 696 nci_request(ndev, nci_rf_deactivate_req, 0, 697 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 698 } 699 700 rc = nfc_tm_deactivated(nfc_dev); 701 if (rc) 702 pr_err("error when signaling tm deactivation\n"); 703 } 704 705 return 0; 706 } 707 708 709 static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target, 710 struct sk_buff *skb, 711 data_exchange_cb_t cb, void *cb_context) 712 { 713 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 714 int rc; 715 716 pr_debug("target_idx %d, len %d\n", target->idx, skb->len); 717 718 if (!ndev->target_active_prot) { 719 pr_err("unable to exchange data, no active target\n"); 720 return -EINVAL; 721 } 722 723 if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 724 return -EBUSY; 725 726 /* store cb and context to be used on receiving data */ 727 ndev->data_exchange_cb = cb; 728 ndev->data_exchange_cb_context = cb_context; 729 730 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb); 731 if (rc) 732 clear_bit(NCI_DATA_EXCHANGE, &ndev->flags); 733 734 return rc; 735 } 736 737 static int nci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb) 738 { 739 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 740 int rc; 741 742 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb); 743 if (rc) 744 pr_err("unable to send data\n"); 745 746 return rc; 747 } 748 749 static int nci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx) 750 { 751 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 752 753 if (ndev->ops->enable_se) 754 return ndev->ops->enable_se(ndev, se_idx); 755 756 return 0; 757 } 758 759 static int nci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx) 760 { 761 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 762 763 if (ndev->ops->disable_se) 764 return ndev->ops->disable_se(ndev, se_idx); 765 766 return 0; 767 } 768 769 static int nci_discover_se(struct nfc_dev *nfc_dev) 770 { 771 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 772 773 if (ndev->ops->discover_se) 774 return ndev->ops->discover_se(ndev); 775 776 return 0; 777 } 778 779 static int nci_se_io(struct nfc_dev *nfc_dev, u32 se_idx, 780 u8 *apdu, size_t apdu_length, 781 se_io_cb_t cb, void *cb_context) 782 { 783 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 784 785 if (ndev->ops->se_io) 786 return ndev->ops->se_io(ndev, se_idx, apdu, 787 apdu_length, cb, cb_context); 788 789 return 0; 790 } 791 792 static struct nfc_ops nci_nfc_ops = { 793 .dev_up = nci_dev_up, 794 .dev_down = nci_dev_down, 795 .start_poll = nci_start_poll, 796 .stop_poll = nci_stop_poll, 797 .dep_link_up = nci_dep_link_up, 798 .dep_link_down = nci_dep_link_down, 799 .activate_target = nci_activate_target, 800 .deactivate_target = nci_deactivate_target, 801 .im_transceive = nci_transceive, 802 .tm_send = nci_tm_send, 803 .enable_se = nci_enable_se, 804 .disable_se = nci_disable_se, 805 .discover_se = nci_discover_se, 806 .se_io = nci_se_io, 807 }; 808 809 /* ---- Interface to NCI drivers ---- */ 810 811 /** 812 * nci_allocate_device - allocate a new nci device 813 * 814 * @ops: device operations 815 * @supported_protocols: NFC protocols supported by the device 816 */ 817 struct nci_dev *nci_allocate_device(struct nci_ops *ops, 818 __u32 supported_protocols, 819 int tx_headroom, int tx_tailroom) 820 { 821 struct nci_dev *ndev; 822 823 pr_debug("supported_protocols 0x%x\n", supported_protocols); 824 825 if (!ops->open || !ops->close || !ops->send) 826 return NULL; 827 828 if (!supported_protocols) 829 return NULL; 830 831 ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL); 832 if (!ndev) 833 return NULL; 834 835 ndev->ops = ops; 836 ndev->tx_headroom = tx_headroom; 837 ndev->tx_tailroom = tx_tailroom; 838 init_completion(&ndev->req_completion); 839 840 ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops, 841 supported_protocols, 842 tx_headroom + NCI_DATA_HDR_SIZE, 843 tx_tailroom); 844 if (!ndev->nfc_dev) 845 goto free_exit; 846 847 nfc_set_drvdata(ndev->nfc_dev, ndev); 848 849 return ndev; 850 851 free_exit: 852 kfree(ndev); 853 return NULL; 854 } 855 EXPORT_SYMBOL(nci_allocate_device); 856 857 /** 858 * nci_free_device - deallocate nci device 859 * 860 * @ndev: The nci device to deallocate 861 */ 862 void nci_free_device(struct nci_dev *ndev) 863 { 864 nfc_free_device(ndev->nfc_dev); 865 kfree(ndev); 866 } 867 EXPORT_SYMBOL(nci_free_device); 868 869 /** 870 * nci_register_device - register a nci device in the nfc subsystem 871 * 872 * @dev: The nci device to register 873 */ 874 int nci_register_device(struct nci_dev *ndev) 875 { 876 int rc; 877 struct device *dev = &ndev->nfc_dev->dev; 878 char name[32]; 879 880 ndev->flags = 0; 881 882 INIT_WORK(&ndev->cmd_work, nci_cmd_work); 883 snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev)); 884 ndev->cmd_wq = create_singlethread_workqueue(name); 885 if (!ndev->cmd_wq) { 886 rc = -ENOMEM; 887 goto exit; 888 } 889 890 INIT_WORK(&ndev->rx_work, nci_rx_work); 891 snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev)); 892 ndev->rx_wq = create_singlethread_workqueue(name); 893 if (!ndev->rx_wq) { 894 rc = -ENOMEM; 895 goto destroy_cmd_wq_exit; 896 } 897 898 INIT_WORK(&ndev->tx_work, nci_tx_work); 899 snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev)); 900 ndev->tx_wq = create_singlethread_workqueue(name); 901 if (!ndev->tx_wq) { 902 rc = -ENOMEM; 903 goto destroy_rx_wq_exit; 904 } 905 906 skb_queue_head_init(&ndev->cmd_q); 907 skb_queue_head_init(&ndev->rx_q); 908 skb_queue_head_init(&ndev->tx_q); 909 910 setup_timer(&ndev->cmd_timer, nci_cmd_timer, 911 (unsigned long) ndev); 912 setup_timer(&ndev->data_timer, nci_data_timer, 913 (unsigned long) ndev); 914 915 mutex_init(&ndev->req_lock); 916 917 rc = nfc_register_device(ndev->nfc_dev); 918 if (rc) 919 goto destroy_rx_wq_exit; 920 921 goto exit; 922 923 destroy_rx_wq_exit: 924 destroy_workqueue(ndev->rx_wq); 925 926 destroy_cmd_wq_exit: 927 destroy_workqueue(ndev->cmd_wq); 928 929 exit: 930 return rc; 931 } 932 EXPORT_SYMBOL(nci_register_device); 933 934 /** 935 * nci_unregister_device - unregister a nci device in the nfc subsystem 936 * 937 * @dev: The nci device to unregister 938 */ 939 void nci_unregister_device(struct nci_dev *ndev) 940 { 941 nci_close_device(ndev); 942 943 destroy_workqueue(ndev->cmd_wq); 944 destroy_workqueue(ndev->rx_wq); 945 destroy_workqueue(ndev->tx_wq); 946 947 nfc_unregister_device(ndev->nfc_dev); 948 } 949 EXPORT_SYMBOL(nci_unregister_device); 950 951 /** 952 * nci_recv_frame - receive frame from NCI drivers 953 * 954 * @ndev: The nci device 955 * @skb: The sk_buff to receive 956 */ 957 int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb) 958 { 959 pr_debug("len %d\n", skb->len); 960 961 if (!ndev || (!test_bit(NCI_UP, &ndev->flags) && 962 !test_bit(NCI_INIT, &ndev->flags))) { 963 kfree_skb(skb); 964 return -ENXIO; 965 } 966 967 /* Queue frame for rx worker thread */ 968 skb_queue_tail(&ndev->rx_q, skb); 969 queue_work(ndev->rx_wq, &ndev->rx_work); 970 971 return 0; 972 } 973 EXPORT_SYMBOL(nci_recv_frame); 974 975 static int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb) 976 { 977 pr_debug("len %d\n", skb->len); 978 979 if (!ndev) { 980 kfree_skb(skb); 981 return -ENODEV; 982 } 983 984 /* Get rid of skb owner, prior to sending to the driver. */ 985 skb_orphan(skb); 986 987 /* Send copy to sniffer */ 988 nfc_send_to_raw_sock(ndev->nfc_dev, skb, 989 RAW_PAYLOAD_NCI, NFC_DIRECTION_TX); 990 991 return ndev->ops->send(ndev, skb); 992 } 993 994 /* Send NCI command */ 995 int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload) 996 { 997 struct nci_ctrl_hdr *hdr; 998 struct sk_buff *skb; 999 1000 pr_debug("opcode 0x%x, plen %d\n", opcode, plen); 1001 1002 skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL); 1003 if (!skb) { 1004 pr_err("no memory for command\n"); 1005 return -ENOMEM; 1006 } 1007 1008 hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE); 1009 hdr->gid = nci_opcode_gid(opcode); 1010 hdr->oid = nci_opcode_oid(opcode); 1011 hdr->plen = plen; 1012 1013 nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT); 1014 nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST); 1015 1016 if (plen) 1017 memcpy(skb_put(skb, plen), payload, plen); 1018 1019 skb_queue_tail(&ndev->cmd_q, skb); 1020 queue_work(ndev->cmd_wq, &ndev->cmd_work); 1021 1022 return 0; 1023 } 1024 1025 /* ---- NCI TX Data worker thread ---- */ 1026 1027 static void nci_tx_work(struct work_struct *work) 1028 { 1029 struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work); 1030 struct sk_buff *skb; 1031 1032 pr_debug("credits_cnt %d\n", atomic_read(&ndev->credits_cnt)); 1033 1034 /* Send queued tx data */ 1035 while (atomic_read(&ndev->credits_cnt)) { 1036 skb = skb_dequeue(&ndev->tx_q); 1037 if (!skb) 1038 return; 1039 1040 /* Check if data flow control is used */ 1041 if (atomic_read(&ndev->credits_cnt) != 1042 NCI_DATA_FLOW_CONTROL_NOT_USED) 1043 atomic_dec(&ndev->credits_cnt); 1044 1045 pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n", 1046 nci_pbf(skb->data), 1047 nci_conn_id(skb->data), 1048 nci_plen(skb->data)); 1049 1050 nci_send_frame(ndev, skb); 1051 1052 mod_timer(&ndev->data_timer, 1053 jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT)); 1054 } 1055 } 1056 1057 /* ----- NCI RX worker thread (data & control) ----- */ 1058 1059 static void nci_rx_work(struct work_struct *work) 1060 { 1061 struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work); 1062 struct sk_buff *skb; 1063 1064 while ((skb = skb_dequeue(&ndev->rx_q))) { 1065 1066 /* Send copy to sniffer */ 1067 nfc_send_to_raw_sock(ndev->nfc_dev, skb, 1068 RAW_PAYLOAD_NCI, NFC_DIRECTION_RX); 1069 1070 /* Process frame */ 1071 switch (nci_mt(skb->data)) { 1072 case NCI_MT_RSP_PKT: 1073 nci_rsp_packet(ndev, skb); 1074 break; 1075 1076 case NCI_MT_NTF_PKT: 1077 nci_ntf_packet(ndev, skb); 1078 break; 1079 1080 case NCI_MT_DATA_PKT: 1081 nci_rx_data_packet(ndev, skb); 1082 break; 1083 1084 default: 1085 pr_err("unknown MT 0x%x\n", nci_mt(skb->data)); 1086 kfree_skb(skb); 1087 break; 1088 } 1089 } 1090 1091 /* check if a data exchange timout has occurred */ 1092 if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) { 1093 /* complete the data exchange transaction, if exists */ 1094 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 1095 nci_data_exchange_complete(ndev, NULL, -ETIMEDOUT); 1096 1097 clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); 1098 } 1099 } 1100 1101 /* ----- NCI TX CMD worker thread ----- */ 1102 1103 static void nci_cmd_work(struct work_struct *work) 1104 { 1105 struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work); 1106 struct sk_buff *skb; 1107 1108 pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt)); 1109 1110 /* Send queued command */ 1111 if (atomic_read(&ndev->cmd_cnt)) { 1112 skb = skb_dequeue(&ndev->cmd_q); 1113 if (!skb) 1114 return; 1115 1116 atomic_dec(&ndev->cmd_cnt); 1117 1118 pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n", 1119 nci_pbf(skb->data), 1120 nci_opcode_gid(nci_opcode(skb->data)), 1121 nci_opcode_oid(nci_opcode(skb->data)), 1122 nci_plen(skb->data)); 1123 1124 nci_send_frame(ndev, skb); 1125 1126 mod_timer(&ndev->cmd_timer, 1127 jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT)); 1128 } 1129 } 1130 1131 MODULE_LICENSE("GPL"); 1132