1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * The NFC Controller Interface is the communication protocol between an 4 * NFC Controller (NFCC) and a Device Host (DH). 5 * 6 * Copyright (C) 2011 Texas Instruments, Inc. 7 * Copyright (C) 2014 Marvell International Ltd. 8 * 9 * Written by Ilan Elias <ilane@ti.com> 10 * 11 * Acknowledgements: 12 * This file is based on hci_core.c, which was written 13 * by Maxim Krasnyansky. 14 */ 15 16 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ 17 18 #include <linux/module.h> 19 #include <linux/kernel.h> 20 #include <linux/types.h> 21 #include <linux/workqueue.h> 22 #include <linux/completion.h> 23 #include <linux/export.h> 24 #include <linux/sched.h> 25 #include <linux/bitops.h> 26 #include <linux/skbuff.h> 27 28 #include "../nfc.h" 29 #include <net/nfc/nci.h> 30 #include <net/nfc/nci_core.h> 31 #include <linux/nfc.h> 32 33 struct core_conn_create_data { 34 int length; 35 struct nci_core_conn_create_cmd *cmd; 36 }; 37 38 static void nci_cmd_work(struct work_struct *work); 39 static void nci_rx_work(struct work_struct *work); 40 static void nci_tx_work(struct work_struct *work); 41 42 struct nci_conn_info *nci_get_conn_info_by_conn_id(struct nci_dev *ndev, 43 int conn_id) 44 { 45 struct nci_conn_info *conn_info; 46 47 list_for_each_entry(conn_info, &ndev->conn_info_list, list) { 48 if (conn_info->conn_id == conn_id) 49 return conn_info; 50 } 51 52 return NULL; 53 } 54 55 int nci_get_conn_info_by_dest_type_params(struct nci_dev *ndev, u8 dest_type, 56 const struct dest_spec_params *params) 57 { 58 const struct nci_conn_info *conn_info; 59 60 list_for_each_entry(conn_info, &ndev->conn_info_list, list) { 61 if (conn_info->dest_type == dest_type) { 62 if (!params) 63 return conn_info->conn_id; 64 65 if (params->id == conn_info->dest_params->id && 66 params->protocol == conn_info->dest_params->protocol) 67 return conn_info->conn_id; 68 } 69 } 70 71 return -EINVAL; 72 } 73 EXPORT_SYMBOL(nci_get_conn_info_by_dest_type_params); 74 75 /* ---- NCI requests ---- */ 76 77 void nci_req_complete(struct nci_dev *ndev, int result) 78 { 79 if (ndev->req_status == NCI_REQ_PEND) { 80 ndev->req_result = result; 81 ndev->req_status = NCI_REQ_DONE; 82 complete(&ndev->req_completion); 83 } 84 } 85 EXPORT_SYMBOL(nci_req_complete); 86 87 static void nci_req_cancel(struct nci_dev *ndev, int err) 88 { 89 if (ndev->req_status == NCI_REQ_PEND) { 90 ndev->req_result = err; 91 ndev->req_status = NCI_REQ_CANCELED; 92 complete(&ndev->req_completion); 93 } 94 } 95 96 /* Execute request and wait for completion. */ 97 static int __nci_request(struct nci_dev *ndev, 98 void (*req)(struct nci_dev *ndev, const void *opt), 99 const void *opt, __u32 timeout) 100 { 101 int rc = 0; 102 long completion_rc; 103 104 ndev->req_status = NCI_REQ_PEND; 105 106 reinit_completion(&ndev->req_completion); 107 req(ndev, opt); 108 completion_rc = 109 wait_for_completion_interruptible_timeout(&ndev->req_completion, 110 timeout); 111 112 pr_debug("wait_for_completion return %ld\n", completion_rc); 113 114 if (completion_rc > 0) { 115 switch (ndev->req_status) { 116 case NCI_REQ_DONE: 117 rc = nci_to_errno(ndev->req_result); 118 break; 119 120 case NCI_REQ_CANCELED: 121 rc = -ndev->req_result; 122 break; 123 124 default: 125 rc = -ETIMEDOUT; 126 break; 127 } 128 } else { 129 pr_err("wait_for_completion_interruptible_timeout failed %ld\n", 130 completion_rc); 131 132 rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc)); 133 } 134 135 ndev->req_status = ndev->req_result = 0; 136 137 return rc; 138 } 139 140 inline int nci_request(struct nci_dev *ndev, 141 void (*req)(struct nci_dev *ndev, 142 const void *opt), 143 const void *opt, __u32 timeout) 144 { 145 int rc; 146 147 /* Serialize all requests */ 148 mutex_lock(&ndev->req_lock); 149 /* check the state after obtaing the lock against any races 150 * from nci_close_device when the device gets removed. 151 */ 152 if (test_bit(NCI_UP, &ndev->flags)) 153 rc = __nci_request(ndev, req, opt, timeout); 154 else 155 rc = -ENETDOWN; 156 mutex_unlock(&ndev->req_lock); 157 158 return rc; 159 } 160 161 static void nci_reset_req(struct nci_dev *ndev, const void *opt) 162 { 163 struct nci_core_reset_cmd cmd; 164 165 cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG; 166 nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd); 167 } 168 169 static void nci_init_req(struct nci_dev *ndev, const void *opt) 170 { 171 u8 plen = 0; 172 173 if (opt) 174 plen = sizeof(struct nci_core_init_v2_cmd); 175 176 nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, plen, opt); 177 } 178 179 static void nci_init_complete_req(struct nci_dev *ndev, const void *opt) 180 { 181 struct nci_rf_disc_map_cmd cmd; 182 struct disc_map_config *cfg = cmd.mapping_configs; 183 __u8 *num = &cmd.num_mapping_configs; 184 int i; 185 186 /* set rf mapping configurations */ 187 *num = 0; 188 189 /* by default mapping is set to NCI_RF_INTERFACE_FRAME */ 190 for (i = 0; i < ndev->num_supported_rf_interfaces; i++) { 191 if (ndev->supported_rf_interfaces[i] == 192 NCI_RF_INTERFACE_ISO_DEP) { 193 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP; 194 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL | 195 NCI_DISC_MAP_MODE_LISTEN; 196 cfg[*num].rf_interface = NCI_RF_INTERFACE_ISO_DEP; 197 (*num)++; 198 } else if (ndev->supported_rf_interfaces[i] == 199 NCI_RF_INTERFACE_NFC_DEP) { 200 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP; 201 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL | 202 NCI_DISC_MAP_MODE_LISTEN; 203 cfg[*num].rf_interface = NCI_RF_INTERFACE_NFC_DEP; 204 (*num)++; 205 } 206 207 if (*num == NCI_MAX_NUM_MAPPING_CONFIGS) 208 break; 209 } 210 211 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD, 212 (1 + ((*num) * sizeof(struct disc_map_config))), &cmd); 213 } 214 215 struct nci_set_config_param { 216 __u8 id; 217 size_t len; 218 const __u8 *val; 219 }; 220 221 static void nci_set_config_req(struct nci_dev *ndev, const void *opt) 222 { 223 const struct nci_set_config_param *param = opt; 224 struct nci_core_set_config_cmd cmd; 225 226 BUG_ON(param->len > NCI_MAX_PARAM_LEN); 227 228 cmd.num_params = 1; 229 cmd.param.id = param->id; 230 cmd.param.len = param->len; 231 memcpy(cmd.param.val, param->val, param->len); 232 233 nci_send_cmd(ndev, NCI_OP_CORE_SET_CONFIG_CMD, (3 + param->len), &cmd); 234 } 235 236 struct nci_rf_discover_param { 237 __u32 im_protocols; 238 __u32 tm_protocols; 239 }; 240 241 static void nci_rf_discover_req(struct nci_dev *ndev, const void *opt) 242 { 243 const struct nci_rf_discover_param *param = opt; 244 struct nci_rf_disc_cmd cmd; 245 246 cmd.num_disc_configs = 0; 247 248 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 249 (param->im_protocols & NFC_PROTO_JEWEL_MASK || 250 param->im_protocols & NFC_PROTO_MIFARE_MASK || 251 param->im_protocols & NFC_PROTO_ISO14443_MASK || 252 param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) { 253 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 254 NCI_NFC_A_PASSIVE_POLL_MODE; 255 cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 256 cmd.num_disc_configs++; 257 } 258 259 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 260 (param->im_protocols & NFC_PROTO_ISO14443_B_MASK)) { 261 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 262 NCI_NFC_B_PASSIVE_POLL_MODE; 263 cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 264 cmd.num_disc_configs++; 265 } 266 267 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 268 (param->im_protocols & NFC_PROTO_FELICA_MASK || 269 param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) { 270 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 271 NCI_NFC_F_PASSIVE_POLL_MODE; 272 cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 273 cmd.num_disc_configs++; 274 } 275 276 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 277 (param->im_protocols & NFC_PROTO_ISO15693_MASK)) { 278 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 279 NCI_NFC_V_PASSIVE_POLL_MODE; 280 cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 281 cmd.num_disc_configs++; 282 } 283 284 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS - 1) && 285 (param->tm_protocols & NFC_PROTO_NFC_DEP_MASK)) { 286 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 287 NCI_NFC_A_PASSIVE_LISTEN_MODE; 288 cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 289 cmd.num_disc_configs++; 290 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 291 NCI_NFC_F_PASSIVE_LISTEN_MODE; 292 cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 293 cmd.num_disc_configs++; 294 } 295 296 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD, 297 (1 + (cmd.num_disc_configs * sizeof(struct disc_config))), 298 &cmd); 299 } 300 301 struct nci_rf_discover_select_param { 302 __u8 rf_discovery_id; 303 __u8 rf_protocol; 304 }; 305 306 static void nci_rf_discover_select_req(struct nci_dev *ndev, const void *opt) 307 { 308 const struct nci_rf_discover_select_param *param = opt; 309 struct nci_rf_discover_select_cmd cmd; 310 311 cmd.rf_discovery_id = param->rf_discovery_id; 312 cmd.rf_protocol = param->rf_protocol; 313 314 switch (cmd.rf_protocol) { 315 case NCI_RF_PROTOCOL_ISO_DEP: 316 cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP; 317 break; 318 319 case NCI_RF_PROTOCOL_NFC_DEP: 320 cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP; 321 break; 322 323 default: 324 cmd.rf_interface = NCI_RF_INTERFACE_FRAME; 325 break; 326 } 327 328 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD, 329 sizeof(struct nci_rf_discover_select_cmd), &cmd); 330 } 331 332 static void nci_rf_deactivate_req(struct nci_dev *ndev, const void *opt) 333 { 334 struct nci_rf_deactivate_cmd cmd; 335 336 cmd.type = (unsigned long)opt; 337 338 nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD, 339 sizeof(struct nci_rf_deactivate_cmd), &cmd); 340 } 341 342 struct nci_cmd_param { 343 __u16 opcode; 344 size_t len; 345 const __u8 *payload; 346 }; 347 348 static void nci_generic_req(struct nci_dev *ndev, const void *opt) 349 { 350 const struct nci_cmd_param *param = opt; 351 352 nci_send_cmd(ndev, param->opcode, param->len, param->payload); 353 } 354 355 int nci_prop_cmd(struct nci_dev *ndev, __u8 oid, size_t len, const __u8 *payload) 356 { 357 struct nci_cmd_param param; 358 359 param.opcode = nci_opcode_pack(NCI_GID_PROPRIETARY, oid); 360 param.len = len; 361 param.payload = payload; 362 363 return __nci_request(ndev, nci_generic_req, ¶m, 364 msecs_to_jiffies(NCI_CMD_TIMEOUT)); 365 } 366 EXPORT_SYMBOL(nci_prop_cmd); 367 368 int nci_core_cmd(struct nci_dev *ndev, __u16 opcode, size_t len, 369 const __u8 *payload) 370 { 371 struct nci_cmd_param param; 372 373 param.opcode = opcode; 374 param.len = len; 375 param.payload = payload; 376 377 return __nci_request(ndev, nci_generic_req, ¶m, 378 msecs_to_jiffies(NCI_CMD_TIMEOUT)); 379 } 380 EXPORT_SYMBOL(nci_core_cmd); 381 382 int nci_core_reset(struct nci_dev *ndev) 383 { 384 return __nci_request(ndev, nci_reset_req, (void *)0, 385 msecs_to_jiffies(NCI_RESET_TIMEOUT)); 386 } 387 EXPORT_SYMBOL(nci_core_reset); 388 389 int nci_core_init(struct nci_dev *ndev) 390 { 391 return __nci_request(ndev, nci_init_req, (void *)0, 392 msecs_to_jiffies(NCI_INIT_TIMEOUT)); 393 } 394 EXPORT_SYMBOL(nci_core_init); 395 396 struct nci_loopback_data { 397 u8 conn_id; 398 struct sk_buff *data; 399 }; 400 401 static void nci_send_data_req(struct nci_dev *ndev, const void *opt) 402 { 403 const struct nci_loopback_data *data = opt; 404 405 nci_send_data(ndev, data->conn_id, data->data); 406 } 407 408 static void nci_nfcc_loopback_cb(void *context, struct sk_buff *skb, int err) 409 { 410 struct nci_dev *ndev = (struct nci_dev *)context; 411 struct nci_conn_info *conn_info; 412 413 conn_info = nci_get_conn_info_by_conn_id(ndev, ndev->cur_conn_id); 414 if (!conn_info) { 415 nci_req_complete(ndev, NCI_STATUS_REJECTED); 416 return; 417 } 418 419 conn_info->rx_skb = skb; 420 421 nci_req_complete(ndev, NCI_STATUS_OK); 422 } 423 424 int nci_nfcc_loopback(struct nci_dev *ndev, const void *data, size_t data_len, 425 struct sk_buff **resp) 426 { 427 int r; 428 struct nci_loopback_data loopback_data; 429 struct nci_conn_info *conn_info; 430 struct sk_buff *skb; 431 int conn_id = nci_get_conn_info_by_dest_type_params(ndev, 432 NCI_DESTINATION_NFCC_LOOPBACK, NULL); 433 434 if (conn_id < 0) { 435 r = nci_core_conn_create(ndev, NCI_DESTINATION_NFCC_LOOPBACK, 436 0, 0, NULL); 437 if (r != NCI_STATUS_OK) 438 return r; 439 440 conn_id = nci_get_conn_info_by_dest_type_params(ndev, 441 NCI_DESTINATION_NFCC_LOOPBACK, 442 NULL); 443 } 444 445 conn_info = nci_get_conn_info_by_conn_id(ndev, conn_id); 446 if (!conn_info) 447 return -EPROTO; 448 449 /* store cb and context to be used on receiving data */ 450 conn_info->data_exchange_cb = nci_nfcc_loopback_cb; 451 conn_info->data_exchange_cb_context = ndev; 452 453 skb = nci_skb_alloc(ndev, NCI_DATA_HDR_SIZE + data_len, GFP_KERNEL); 454 if (!skb) 455 return -ENOMEM; 456 457 skb_reserve(skb, NCI_DATA_HDR_SIZE); 458 skb_put_data(skb, data, data_len); 459 460 loopback_data.conn_id = conn_id; 461 loopback_data.data = skb; 462 463 ndev->cur_conn_id = conn_id; 464 r = nci_request(ndev, nci_send_data_req, &loopback_data, 465 msecs_to_jiffies(NCI_DATA_TIMEOUT)); 466 if (r == NCI_STATUS_OK && resp) 467 *resp = conn_info->rx_skb; 468 469 return r; 470 } 471 EXPORT_SYMBOL(nci_nfcc_loopback); 472 473 static int nci_open_device(struct nci_dev *ndev) 474 { 475 int rc = 0; 476 477 mutex_lock(&ndev->req_lock); 478 479 if (test_bit(NCI_UNREG, &ndev->flags)) { 480 rc = -ENODEV; 481 goto done; 482 } 483 484 if (test_bit(NCI_UP, &ndev->flags)) { 485 rc = -EALREADY; 486 goto done; 487 } 488 489 if (ndev->ops->open(ndev)) { 490 rc = -EIO; 491 goto done; 492 } 493 494 atomic_set(&ndev->cmd_cnt, 1); 495 496 set_bit(NCI_INIT, &ndev->flags); 497 498 if (ndev->ops->init) 499 rc = ndev->ops->init(ndev); 500 501 if (!rc) { 502 rc = __nci_request(ndev, nci_reset_req, (void *)0, 503 msecs_to_jiffies(NCI_RESET_TIMEOUT)); 504 } 505 506 if (!rc && ndev->ops->setup) { 507 rc = ndev->ops->setup(ndev); 508 } 509 510 if (!rc) { 511 struct nci_core_init_v2_cmd nci_init_v2_cmd = { 512 .feature1 = NCI_FEATURE_DISABLE, 513 .feature2 = NCI_FEATURE_DISABLE 514 }; 515 const void *opt = NULL; 516 517 if (ndev->nci_ver & NCI_VER_2_MASK) 518 opt = &nci_init_v2_cmd; 519 520 rc = __nci_request(ndev, nci_init_req, opt, 521 msecs_to_jiffies(NCI_INIT_TIMEOUT)); 522 } 523 524 if (!rc && ndev->ops->post_setup) 525 rc = ndev->ops->post_setup(ndev); 526 527 if (!rc) { 528 rc = __nci_request(ndev, nci_init_complete_req, (void *)0, 529 msecs_to_jiffies(NCI_INIT_TIMEOUT)); 530 } 531 532 clear_bit(NCI_INIT, &ndev->flags); 533 534 if (!rc) { 535 set_bit(NCI_UP, &ndev->flags); 536 nci_clear_target_list(ndev); 537 atomic_set(&ndev->state, NCI_IDLE); 538 } else { 539 /* Init failed, cleanup */ 540 skb_queue_purge(&ndev->cmd_q); 541 skb_queue_purge(&ndev->rx_q); 542 skb_queue_purge(&ndev->tx_q); 543 544 ndev->ops->close(ndev); 545 ndev->flags = 0; 546 } 547 548 done: 549 mutex_unlock(&ndev->req_lock); 550 return rc; 551 } 552 553 static int nci_close_device(struct nci_dev *ndev) 554 { 555 nci_req_cancel(ndev, ENODEV); 556 557 /* This mutex needs to be held as a barrier for 558 * caller nci_unregister_device 559 */ 560 mutex_lock(&ndev->req_lock); 561 562 if (!test_and_clear_bit(NCI_UP, &ndev->flags)) { 563 /* Need to flush the cmd wq in case 564 * there is a queued/running cmd_work 565 */ 566 flush_workqueue(ndev->cmd_wq); 567 del_timer_sync(&ndev->cmd_timer); 568 del_timer_sync(&ndev->data_timer); 569 mutex_unlock(&ndev->req_lock); 570 return 0; 571 } 572 573 /* Drop RX and TX queues */ 574 skb_queue_purge(&ndev->rx_q); 575 skb_queue_purge(&ndev->tx_q); 576 577 /* Flush RX and TX wq */ 578 flush_workqueue(ndev->rx_wq); 579 flush_workqueue(ndev->tx_wq); 580 581 /* Reset device */ 582 skb_queue_purge(&ndev->cmd_q); 583 atomic_set(&ndev->cmd_cnt, 1); 584 585 set_bit(NCI_INIT, &ndev->flags); 586 __nci_request(ndev, nci_reset_req, (void *)0, 587 msecs_to_jiffies(NCI_RESET_TIMEOUT)); 588 589 /* After this point our queues are empty 590 * and no works are scheduled. 591 */ 592 ndev->ops->close(ndev); 593 594 clear_bit(NCI_INIT, &ndev->flags); 595 596 /* Flush cmd wq */ 597 flush_workqueue(ndev->cmd_wq); 598 599 del_timer_sync(&ndev->cmd_timer); 600 601 /* Clear flags except NCI_UNREG */ 602 ndev->flags &= BIT(NCI_UNREG); 603 604 mutex_unlock(&ndev->req_lock); 605 606 return 0; 607 } 608 609 /* NCI command timer function */ 610 static void nci_cmd_timer(struct timer_list *t) 611 { 612 struct nci_dev *ndev = from_timer(ndev, t, cmd_timer); 613 614 atomic_set(&ndev->cmd_cnt, 1); 615 queue_work(ndev->cmd_wq, &ndev->cmd_work); 616 } 617 618 /* NCI data exchange timer function */ 619 static void nci_data_timer(struct timer_list *t) 620 { 621 struct nci_dev *ndev = from_timer(ndev, t, data_timer); 622 623 set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); 624 queue_work(ndev->rx_wq, &ndev->rx_work); 625 } 626 627 static int nci_dev_up(struct nfc_dev *nfc_dev) 628 { 629 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 630 631 return nci_open_device(ndev); 632 } 633 634 static int nci_dev_down(struct nfc_dev *nfc_dev) 635 { 636 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 637 638 return nci_close_device(ndev); 639 } 640 641 int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, const __u8 *val) 642 { 643 struct nci_set_config_param param; 644 645 if (!val || !len) 646 return 0; 647 648 param.id = id; 649 param.len = len; 650 param.val = val; 651 652 return __nci_request(ndev, nci_set_config_req, ¶m, 653 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT)); 654 } 655 EXPORT_SYMBOL(nci_set_config); 656 657 static void nci_nfcee_discover_req(struct nci_dev *ndev, const void *opt) 658 { 659 struct nci_nfcee_discover_cmd cmd; 660 __u8 action = (unsigned long)opt; 661 662 cmd.discovery_action = action; 663 664 nci_send_cmd(ndev, NCI_OP_NFCEE_DISCOVER_CMD, 1, &cmd); 665 } 666 667 int nci_nfcee_discover(struct nci_dev *ndev, u8 action) 668 { 669 unsigned long opt = action; 670 671 return __nci_request(ndev, nci_nfcee_discover_req, (void *)opt, 672 msecs_to_jiffies(NCI_CMD_TIMEOUT)); 673 } 674 EXPORT_SYMBOL(nci_nfcee_discover); 675 676 static void nci_nfcee_mode_set_req(struct nci_dev *ndev, const void *opt) 677 { 678 const struct nci_nfcee_mode_set_cmd *cmd = opt; 679 680 nci_send_cmd(ndev, NCI_OP_NFCEE_MODE_SET_CMD, 681 sizeof(struct nci_nfcee_mode_set_cmd), cmd); 682 } 683 684 int nci_nfcee_mode_set(struct nci_dev *ndev, u8 nfcee_id, u8 nfcee_mode) 685 { 686 struct nci_nfcee_mode_set_cmd cmd; 687 688 cmd.nfcee_id = nfcee_id; 689 cmd.nfcee_mode = nfcee_mode; 690 691 return __nci_request(ndev, nci_nfcee_mode_set_req, &cmd, 692 msecs_to_jiffies(NCI_CMD_TIMEOUT)); 693 } 694 EXPORT_SYMBOL(nci_nfcee_mode_set); 695 696 static void nci_core_conn_create_req(struct nci_dev *ndev, const void *opt) 697 { 698 const struct core_conn_create_data *data = opt; 699 700 nci_send_cmd(ndev, NCI_OP_CORE_CONN_CREATE_CMD, data->length, data->cmd); 701 } 702 703 int nci_core_conn_create(struct nci_dev *ndev, u8 destination_type, 704 u8 number_destination_params, 705 size_t params_len, 706 const struct core_conn_create_dest_spec_params *params) 707 { 708 int r; 709 struct nci_core_conn_create_cmd *cmd; 710 struct core_conn_create_data data; 711 712 data.length = params_len + sizeof(struct nci_core_conn_create_cmd); 713 cmd = kzalloc(data.length, GFP_KERNEL); 714 if (!cmd) 715 return -ENOMEM; 716 717 cmd->destination_type = destination_type; 718 cmd->number_destination_params = number_destination_params; 719 720 data.cmd = cmd; 721 722 if (params) { 723 memcpy(cmd->params, params, params_len); 724 if (params->length > 0) 725 memcpy(&ndev->cur_params, 726 ¶ms->value[DEST_SPEC_PARAMS_ID_INDEX], 727 sizeof(struct dest_spec_params)); 728 else 729 ndev->cur_params.id = 0; 730 } else { 731 ndev->cur_params.id = 0; 732 } 733 ndev->cur_dest_type = destination_type; 734 735 r = __nci_request(ndev, nci_core_conn_create_req, &data, 736 msecs_to_jiffies(NCI_CMD_TIMEOUT)); 737 kfree(cmd); 738 return r; 739 } 740 EXPORT_SYMBOL(nci_core_conn_create); 741 742 static void nci_core_conn_close_req(struct nci_dev *ndev, const void *opt) 743 { 744 __u8 conn_id = (unsigned long)opt; 745 746 nci_send_cmd(ndev, NCI_OP_CORE_CONN_CLOSE_CMD, 1, &conn_id); 747 } 748 749 int nci_core_conn_close(struct nci_dev *ndev, u8 conn_id) 750 { 751 unsigned long opt = conn_id; 752 753 ndev->cur_conn_id = conn_id; 754 return __nci_request(ndev, nci_core_conn_close_req, (void *)opt, 755 msecs_to_jiffies(NCI_CMD_TIMEOUT)); 756 } 757 EXPORT_SYMBOL(nci_core_conn_close); 758 759 static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev) 760 { 761 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 762 struct nci_set_config_param param; 763 int rc; 764 765 param.val = nfc_get_local_general_bytes(nfc_dev, ¶m.len); 766 if ((param.val == NULL) || (param.len == 0)) 767 return 0; 768 769 if (param.len > NFC_MAX_GT_LEN) 770 return -EINVAL; 771 772 param.id = NCI_PN_ATR_REQ_GEN_BYTES; 773 774 rc = nci_request(ndev, nci_set_config_req, ¶m, 775 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT)); 776 if (rc) 777 return rc; 778 779 param.id = NCI_LN_ATR_RES_GEN_BYTES; 780 781 return nci_request(ndev, nci_set_config_req, ¶m, 782 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT)); 783 } 784 785 static int nci_set_listen_parameters(struct nfc_dev *nfc_dev) 786 { 787 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 788 int rc; 789 __u8 val; 790 791 val = NCI_LA_SEL_INFO_NFC_DEP_MASK; 792 793 rc = nci_set_config(ndev, NCI_LA_SEL_INFO, 1, &val); 794 if (rc) 795 return rc; 796 797 val = NCI_LF_PROTOCOL_TYPE_NFC_DEP_MASK; 798 799 rc = nci_set_config(ndev, NCI_LF_PROTOCOL_TYPE, 1, &val); 800 if (rc) 801 return rc; 802 803 val = NCI_LF_CON_BITR_F_212 | NCI_LF_CON_BITR_F_424; 804 805 return nci_set_config(ndev, NCI_LF_CON_BITR_F, 1, &val); 806 } 807 808 static int nci_start_poll(struct nfc_dev *nfc_dev, 809 __u32 im_protocols, __u32 tm_protocols) 810 { 811 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 812 struct nci_rf_discover_param param; 813 int rc; 814 815 if ((atomic_read(&ndev->state) == NCI_DISCOVERY) || 816 (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) { 817 pr_err("unable to start poll, since poll is already active\n"); 818 return -EBUSY; 819 } 820 821 if (ndev->target_active_prot) { 822 pr_err("there is an active target\n"); 823 return -EBUSY; 824 } 825 826 if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) || 827 (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) { 828 pr_debug("target active or w4 select, implicitly deactivate\n"); 829 830 rc = nci_request(ndev, nci_rf_deactivate_req, 831 (void *)NCI_DEACTIVATE_TYPE_IDLE_MODE, 832 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 833 if (rc) 834 return -EBUSY; 835 } 836 837 if ((im_protocols | tm_protocols) & NFC_PROTO_NFC_DEP_MASK) { 838 rc = nci_set_local_general_bytes(nfc_dev); 839 if (rc) { 840 pr_err("failed to set local general bytes\n"); 841 return rc; 842 } 843 } 844 845 if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) { 846 rc = nci_set_listen_parameters(nfc_dev); 847 if (rc) 848 pr_err("failed to set listen parameters\n"); 849 } 850 851 param.im_protocols = im_protocols; 852 param.tm_protocols = tm_protocols; 853 rc = nci_request(ndev, nci_rf_discover_req, ¶m, 854 msecs_to_jiffies(NCI_RF_DISC_TIMEOUT)); 855 856 if (!rc) 857 ndev->poll_prots = im_protocols; 858 859 return rc; 860 } 861 862 static void nci_stop_poll(struct nfc_dev *nfc_dev) 863 { 864 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 865 866 if ((atomic_read(&ndev->state) != NCI_DISCOVERY) && 867 (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) { 868 pr_err("unable to stop poll, since poll is not active\n"); 869 return; 870 } 871 872 nci_request(ndev, nci_rf_deactivate_req, 873 (void *)NCI_DEACTIVATE_TYPE_IDLE_MODE, 874 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 875 } 876 877 static int nci_activate_target(struct nfc_dev *nfc_dev, 878 struct nfc_target *target, __u32 protocol) 879 { 880 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 881 struct nci_rf_discover_select_param param; 882 const struct nfc_target *nci_target = NULL; 883 int i; 884 int rc = 0; 885 886 pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol); 887 888 if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) && 889 (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) { 890 pr_err("there is no available target to activate\n"); 891 return -EINVAL; 892 } 893 894 if (ndev->target_active_prot) { 895 pr_err("there is already an active target\n"); 896 return -EBUSY; 897 } 898 899 for (i = 0; i < ndev->n_targets; i++) { 900 if (ndev->targets[i].idx == target->idx) { 901 nci_target = &ndev->targets[i]; 902 break; 903 } 904 } 905 906 if (!nci_target) { 907 pr_err("unable to find the selected target\n"); 908 return -EINVAL; 909 } 910 911 if (!(nci_target->supported_protocols & (1 << protocol))) { 912 pr_err("target does not support the requested protocol 0x%x\n", 913 protocol); 914 return -EINVAL; 915 } 916 917 if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) { 918 param.rf_discovery_id = nci_target->logical_idx; 919 920 if (protocol == NFC_PROTO_JEWEL) 921 param.rf_protocol = NCI_RF_PROTOCOL_T1T; 922 else if (protocol == NFC_PROTO_MIFARE) 923 param.rf_protocol = NCI_RF_PROTOCOL_T2T; 924 else if (protocol == NFC_PROTO_FELICA) 925 param.rf_protocol = NCI_RF_PROTOCOL_T3T; 926 else if (protocol == NFC_PROTO_ISO14443 || 927 protocol == NFC_PROTO_ISO14443_B) 928 param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP; 929 else 930 param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP; 931 932 rc = nci_request(ndev, nci_rf_discover_select_req, ¶m, 933 msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT)); 934 } 935 936 if (!rc) 937 ndev->target_active_prot = protocol; 938 939 return rc; 940 } 941 942 static void nci_deactivate_target(struct nfc_dev *nfc_dev, 943 struct nfc_target *target, 944 __u8 mode) 945 { 946 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 947 unsigned long nci_mode = NCI_DEACTIVATE_TYPE_IDLE_MODE; 948 949 if (!ndev->target_active_prot) { 950 pr_err("unable to deactivate target, no active target\n"); 951 return; 952 } 953 954 ndev->target_active_prot = 0; 955 956 switch (mode) { 957 case NFC_TARGET_MODE_SLEEP: 958 nci_mode = NCI_DEACTIVATE_TYPE_SLEEP_MODE; 959 break; 960 } 961 962 if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) { 963 nci_request(ndev, nci_rf_deactivate_req, (void *)nci_mode, 964 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 965 } 966 } 967 968 static int nci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target, 969 __u8 comm_mode, __u8 *gb, size_t gb_len) 970 { 971 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 972 int rc; 973 974 pr_debug("target_idx %d, comm_mode %d\n", target->idx, comm_mode); 975 976 rc = nci_activate_target(nfc_dev, target, NFC_PROTO_NFC_DEP); 977 if (rc) 978 return rc; 979 980 rc = nfc_set_remote_general_bytes(nfc_dev, ndev->remote_gb, 981 ndev->remote_gb_len); 982 if (!rc) 983 rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_PASSIVE, 984 NFC_RF_INITIATOR); 985 986 return rc; 987 } 988 989 static int nci_dep_link_down(struct nfc_dev *nfc_dev) 990 { 991 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 992 int rc; 993 994 if (nfc_dev->rf_mode == NFC_RF_INITIATOR) { 995 nci_deactivate_target(nfc_dev, NULL, NCI_DEACTIVATE_TYPE_IDLE_MODE); 996 } else { 997 if (atomic_read(&ndev->state) == NCI_LISTEN_ACTIVE || 998 atomic_read(&ndev->state) == NCI_DISCOVERY) { 999 nci_request(ndev, nci_rf_deactivate_req, (void *)0, 1000 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 1001 } 1002 1003 rc = nfc_tm_deactivated(nfc_dev); 1004 if (rc) 1005 pr_err("error when signaling tm deactivation\n"); 1006 } 1007 1008 return 0; 1009 } 1010 1011 1012 static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target, 1013 struct sk_buff *skb, 1014 data_exchange_cb_t cb, void *cb_context) 1015 { 1016 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 1017 int rc; 1018 struct nci_conn_info *conn_info; 1019 1020 conn_info = ndev->rf_conn_info; 1021 if (!conn_info) 1022 return -EPROTO; 1023 1024 pr_debug("target_idx %d, len %d\n", target->idx, skb->len); 1025 1026 if (!ndev->target_active_prot) { 1027 pr_err("unable to exchange data, no active target\n"); 1028 return -EINVAL; 1029 } 1030 1031 if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 1032 return -EBUSY; 1033 1034 /* store cb and context to be used on receiving data */ 1035 conn_info->data_exchange_cb = cb; 1036 conn_info->data_exchange_cb_context = cb_context; 1037 1038 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb); 1039 if (rc) 1040 clear_bit(NCI_DATA_EXCHANGE, &ndev->flags); 1041 1042 return rc; 1043 } 1044 1045 static int nci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb) 1046 { 1047 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 1048 int rc; 1049 1050 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb); 1051 if (rc) 1052 pr_err("unable to send data\n"); 1053 1054 return rc; 1055 } 1056 1057 static int nci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx) 1058 { 1059 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 1060 1061 if (ndev->ops->enable_se) 1062 return ndev->ops->enable_se(ndev, se_idx); 1063 1064 return 0; 1065 } 1066 1067 static int nci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx) 1068 { 1069 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 1070 1071 if (ndev->ops->disable_se) 1072 return ndev->ops->disable_se(ndev, se_idx); 1073 1074 return 0; 1075 } 1076 1077 static int nci_discover_se(struct nfc_dev *nfc_dev) 1078 { 1079 int r; 1080 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 1081 1082 if (ndev->ops->discover_se) { 1083 r = nci_nfcee_discover(ndev, NCI_NFCEE_DISCOVERY_ACTION_ENABLE); 1084 if (r != NCI_STATUS_OK) 1085 return -EPROTO; 1086 1087 return ndev->ops->discover_se(ndev); 1088 } 1089 1090 return 0; 1091 } 1092 1093 static int nci_se_io(struct nfc_dev *nfc_dev, u32 se_idx, 1094 u8 *apdu, size_t apdu_length, 1095 se_io_cb_t cb, void *cb_context) 1096 { 1097 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 1098 1099 if (ndev->ops->se_io) 1100 return ndev->ops->se_io(ndev, se_idx, apdu, 1101 apdu_length, cb, cb_context); 1102 1103 return 0; 1104 } 1105 1106 static int nci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name) 1107 { 1108 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 1109 1110 if (!ndev->ops->fw_download) 1111 return -ENOTSUPP; 1112 1113 return ndev->ops->fw_download(ndev, firmware_name); 1114 } 1115 1116 static const struct nfc_ops nci_nfc_ops = { 1117 .dev_up = nci_dev_up, 1118 .dev_down = nci_dev_down, 1119 .start_poll = nci_start_poll, 1120 .stop_poll = nci_stop_poll, 1121 .dep_link_up = nci_dep_link_up, 1122 .dep_link_down = nci_dep_link_down, 1123 .activate_target = nci_activate_target, 1124 .deactivate_target = nci_deactivate_target, 1125 .im_transceive = nci_transceive, 1126 .tm_send = nci_tm_send, 1127 .enable_se = nci_enable_se, 1128 .disable_se = nci_disable_se, 1129 .discover_se = nci_discover_se, 1130 .se_io = nci_se_io, 1131 .fw_download = nci_fw_download, 1132 }; 1133 1134 /* ---- Interface to NCI drivers ---- */ 1135 /** 1136 * nci_allocate_device - allocate a new nci device 1137 * 1138 * @ops: device operations 1139 * @supported_protocols: NFC protocols supported by the device 1140 * @tx_headroom: Reserved space at beginning of skb 1141 * @tx_tailroom: Reserved space at end of skb 1142 */ 1143 struct nci_dev *nci_allocate_device(const struct nci_ops *ops, 1144 __u32 supported_protocols, 1145 int tx_headroom, int tx_tailroom) 1146 { 1147 struct nci_dev *ndev; 1148 1149 pr_debug("supported_protocols 0x%x\n", supported_protocols); 1150 1151 if (!ops->open || !ops->close || !ops->send) 1152 return NULL; 1153 1154 if (!supported_protocols) 1155 return NULL; 1156 1157 ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL); 1158 if (!ndev) 1159 return NULL; 1160 1161 ndev->ops = ops; 1162 1163 if (ops->n_prop_ops > NCI_MAX_PROPRIETARY_CMD) { 1164 pr_err("Too many proprietary commands: %zd\n", 1165 ops->n_prop_ops); 1166 goto free_nci; 1167 } 1168 1169 ndev->tx_headroom = tx_headroom; 1170 ndev->tx_tailroom = tx_tailroom; 1171 init_completion(&ndev->req_completion); 1172 1173 ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops, 1174 supported_protocols, 1175 tx_headroom + NCI_DATA_HDR_SIZE, 1176 tx_tailroom); 1177 if (!ndev->nfc_dev) 1178 goto free_nci; 1179 1180 ndev->hci_dev = nci_hci_allocate(ndev); 1181 if (!ndev->hci_dev) 1182 goto free_nfc; 1183 1184 nfc_set_drvdata(ndev->nfc_dev, ndev); 1185 1186 return ndev; 1187 1188 free_nfc: 1189 nfc_free_device(ndev->nfc_dev); 1190 free_nci: 1191 kfree(ndev); 1192 return NULL; 1193 } 1194 EXPORT_SYMBOL(nci_allocate_device); 1195 1196 /** 1197 * nci_free_device - deallocate nci device 1198 * 1199 * @ndev: The nci device to deallocate 1200 */ 1201 void nci_free_device(struct nci_dev *ndev) 1202 { 1203 nfc_free_device(ndev->nfc_dev); 1204 nci_hci_deallocate(ndev); 1205 kfree(ndev); 1206 } 1207 EXPORT_SYMBOL(nci_free_device); 1208 1209 /** 1210 * nci_register_device - register a nci device in the nfc subsystem 1211 * 1212 * @ndev: The nci device to register 1213 */ 1214 int nci_register_device(struct nci_dev *ndev) 1215 { 1216 int rc; 1217 struct device *dev = &ndev->nfc_dev->dev; 1218 char name[32]; 1219 1220 ndev->flags = 0; 1221 1222 INIT_WORK(&ndev->cmd_work, nci_cmd_work); 1223 snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev)); 1224 ndev->cmd_wq = create_singlethread_workqueue(name); 1225 if (!ndev->cmd_wq) { 1226 rc = -ENOMEM; 1227 goto exit; 1228 } 1229 1230 INIT_WORK(&ndev->rx_work, nci_rx_work); 1231 snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev)); 1232 ndev->rx_wq = create_singlethread_workqueue(name); 1233 if (!ndev->rx_wq) { 1234 rc = -ENOMEM; 1235 goto destroy_cmd_wq_exit; 1236 } 1237 1238 INIT_WORK(&ndev->tx_work, nci_tx_work); 1239 snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev)); 1240 ndev->tx_wq = create_singlethread_workqueue(name); 1241 if (!ndev->tx_wq) { 1242 rc = -ENOMEM; 1243 goto destroy_rx_wq_exit; 1244 } 1245 1246 skb_queue_head_init(&ndev->cmd_q); 1247 skb_queue_head_init(&ndev->rx_q); 1248 skb_queue_head_init(&ndev->tx_q); 1249 1250 timer_setup(&ndev->cmd_timer, nci_cmd_timer, 0); 1251 timer_setup(&ndev->data_timer, nci_data_timer, 0); 1252 1253 mutex_init(&ndev->req_lock); 1254 INIT_LIST_HEAD(&ndev->conn_info_list); 1255 1256 rc = nfc_register_device(ndev->nfc_dev); 1257 if (rc) 1258 goto destroy_tx_wq_exit; 1259 1260 goto exit; 1261 1262 destroy_tx_wq_exit: 1263 destroy_workqueue(ndev->tx_wq); 1264 1265 destroy_rx_wq_exit: 1266 destroy_workqueue(ndev->rx_wq); 1267 1268 destroy_cmd_wq_exit: 1269 destroy_workqueue(ndev->cmd_wq); 1270 1271 exit: 1272 return rc; 1273 } 1274 EXPORT_SYMBOL(nci_register_device); 1275 1276 /** 1277 * nci_unregister_device - unregister a nci device in the nfc subsystem 1278 * 1279 * @ndev: The nci device to unregister 1280 */ 1281 void nci_unregister_device(struct nci_dev *ndev) 1282 { 1283 struct nci_conn_info *conn_info, *n; 1284 1285 /* This set_bit is not protected with specialized barrier, 1286 * However, it is fine because the mutex_lock(&ndev->req_lock); 1287 * in nci_close_device() will help to emit one. 1288 */ 1289 set_bit(NCI_UNREG, &ndev->flags); 1290 1291 nci_close_device(ndev); 1292 1293 destroy_workqueue(ndev->cmd_wq); 1294 destroy_workqueue(ndev->rx_wq); 1295 destroy_workqueue(ndev->tx_wq); 1296 1297 list_for_each_entry_safe(conn_info, n, &ndev->conn_info_list, list) { 1298 list_del(&conn_info->list); 1299 /* conn_info is allocated with devm_kzalloc */ 1300 } 1301 1302 nfc_unregister_device(ndev->nfc_dev); 1303 } 1304 EXPORT_SYMBOL(nci_unregister_device); 1305 1306 /** 1307 * nci_recv_frame - receive frame from NCI drivers 1308 * 1309 * @ndev: The nci device 1310 * @skb: The sk_buff to receive 1311 */ 1312 int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb) 1313 { 1314 pr_debug("len %d\n", skb->len); 1315 1316 if (!ndev || (!test_bit(NCI_UP, &ndev->flags) && 1317 !test_bit(NCI_INIT, &ndev->flags))) { 1318 kfree_skb(skb); 1319 return -ENXIO; 1320 } 1321 1322 /* Queue frame for rx worker thread */ 1323 skb_queue_tail(&ndev->rx_q, skb); 1324 queue_work(ndev->rx_wq, &ndev->rx_work); 1325 1326 return 0; 1327 } 1328 EXPORT_SYMBOL(nci_recv_frame); 1329 1330 int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb) 1331 { 1332 pr_debug("len %d\n", skb->len); 1333 1334 if (!ndev) { 1335 kfree_skb(skb); 1336 return -ENODEV; 1337 } 1338 1339 /* Get rid of skb owner, prior to sending to the driver. */ 1340 skb_orphan(skb); 1341 1342 /* Send copy to sniffer */ 1343 nfc_send_to_raw_sock(ndev->nfc_dev, skb, 1344 RAW_PAYLOAD_NCI, NFC_DIRECTION_TX); 1345 1346 return ndev->ops->send(ndev, skb); 1347 } 1348 EXPORT_SYMBOL(nci_send_frame); 1349 1350 /* Send NCI command */ 1351 int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, const void *payload) 1352 { 1353 struct nci_ctrl_hdr *hdr; 1354 struct sk_buff *skb; 1355 1356 pr_debug("opcode 0x%x, plen %d\n", opcode, plen); 1357 1358 skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL); 1359 if (!skb) { 1360 pr_err("no memory for command\n"); 1361 return -ENOMEM; 1362 } 1363 1364 hdr = skb_put(skb, NCI_CTRL_HDR_SIZE); 1365 hdr->gid = nci_opcode_gid(opcode); 1366 hdr->oid = nci_opcode_oid(opcode); 1367 hdr->plen = plen; 1368 1369 nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT); 1370 nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST); 1371 1372 if (plen) 1373 skb_put_data(skb, payload, plen); 1374 1375 skb_queue_tail(&ndev->cmd_q, skb); 1376 queue_work(ndev->cmd_wq, &ndev->cmd_work); 1377 1378 return 0; 1379 } 1380 EXPORT_SYMBOL(nci_send_cmd); 1381 1382 /* Proprietary commands API */ 1383 static const struct nci_driver_ops *ops_cmd_lookup(const struct nci_driver_ops *ops, 1384 size_t n_ops, 1385 __u16 opcode) 1386 { 1387 size_t i; 1388 const struct nci_driver_ops *op; 1389 1390 if (!ops || !n_ops) 1391 return NULL; 1392 1393 for (i = 0; i < n_ops; i++) { 1394 op = &ops[i]; 1395 if (op->opcode == opcode) 1396 return op; 1397 } 1398 1399 return NULL; 1400 } 1401 1402 static int nci_op_rsp_packet(struct nci_dev *ndev, __u16 rsp_opcode, 1403 struct sk_buff *skb, const struct nci_driver_ops *ops, 1404 size_t n_ops) 1405 { 1406 const struct nci_driver_ops *op; 1407 1408 op = ops_cmd_lookup(ops, n_ops, rsp_opcode); 1409 if (!op || !op->rsp) 1410 return -ENOTSUPP; 1411 1412 return op->rsp(ndev, skb); 1413 } 1414 1415 static int nci_op_ntf_packet(struct nci_dev *ndev, __u16 ntf_opcode, 1416 struct sk_buff *skb, const struct nci_driver_ops *ops, 1417 size_t n_ops) 1418 { 1419 const struct nci_driver_ops *op; 1420 1421 op = ops_cmd_lookup(ops, n_ops, ntf_opcode); 1422 if (!op || !op->ntf) 1423 return -ENOTSUPP; 1424 1425 return op->ntf(ndev, skb); 1426 } 1427 1428 int nci_prop_rsp_packet(struct nci_dev *ndev, __u16 opcode, 1429 struct sk_buff *skb) 1430 { 1431 return nci_op_rsp_packet(ndev, opcode, skb, ndev->ops->prop_ops, 1432 ndev->ops->n_prop_ops); 1433 } 1434 1435 int nci_prop_ntf_packet(struct nci_dev *ndev, __u16 opcode, 1436 struct sk_buff *skb) 1437 { 1438 return nci_op_ntf_packet(ndev, opcode, skb, ndev->ops->prop_ops, 1439 ndev->ops->n_prop_ops); 1440 } 1441 1442 int nci_core_rsp_packet(struct nci_dev *ndev, __u16 opcode, 1443 struct sk_buff *skb) 1444 { 1445 return nci_op_rsp_packet(ndev, opcode, skb, ndev->ops->core_ops, 1446 ndev->ops->n_core_ops); 1447 } 1448 1449 int nci_core_ntf_packet(struct nci_dev *ndev, __u16 opcode, 1450 struct sk_buff *skb) 1451 { 1452 return nci_op_ntf_packet(ndev, opcode, skb, ndev->ops->core_ops, 1453 ndev->ops->n_core_ops); 1454 } 1455 1456 /* ---- NCI TX Data worker thread ---- */ 1457 1458 static void nci_tx_work(struct work_struct *work) 1459 { 1460 struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work); 1461 struct nci_conn_info *conn_info; 1462 struct sk_buff *skb; 1463 1464 conn_info = nci_get_conn_info_by_conn_id(ndev, ndev->cur_conn_id); 1465 if (!conn_info) 1466 return; 1467 1468 pr_debug("credits_cnt %d\n", atomic_read(&conn_info->credits_cnt)); 1469 1470 /* Send queued tx data */ 1471 while (atomic_read(&conn_info->credits_cnt)) { 1472 skb = skb_dequeue(&ndev->tx_q); 1473 if (!skb) 1474 return; 1475 1476 /* Check if data flow control is used */ 1477 if (atomic_read(&conn_info->credits_cnt) != 1478 NCI_DATA_FLOW_CONTROL_NOT_USED) 1479 atomic_dec(&conn_info->credits_cnt); 1480 1481 pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n", 1482 nci_pbf(skb->data), 1483 nci_conn_id(skb->data), 1484 nci_plen(skb->data)); 1485 1486 nci_send_frame(ndev, skb); 1487 1488 mod_timer(&ndev->data_timer, 1489 jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT)); 1490 } 1491 } 1492 1493 /* ----- NCI RX worker thread (data & control) ----- */ 1494 1495 static void nci_rx_work(struct work_struct *work) 1496 { 1497 struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work); 1498 struct sk_buff *skb; 1499 1500 while ((skb = skb_dequeue(&ndev->rx_q))) { 1501 1502 /* Send copy to sniffer */ 1503 nfc_send_to_raw_sock(ndev->nfc_dev, skb, 1504 RAW_PAYLOAD_NCI, NFC_DIRECTION_RX); 1505 1506 /* Process frame */ 1507 switch (nci_mt(skb->data)) { 1508 case NCI_MT_RSP_PKT: 1509 nci_rsp_packet(ndev, skb); 1510 break; 1511 1512 case NCI_MT_NTF_PKT: 1513 nci_ntf_packet(ndev, skb); 1514 break; 1515 1516 case NCI_MT_DATA_PKT: 1517 nci_rx_data_packet(ndev, skb); 1518 break; 1519 1520 default: 1521 pr_err("unknown MT 0x%x\n", nci_mt(skb->data)); 1522 kfree_skb(skb); 1523 break; 1524 } 1525 } 1526 1527 /* check if a data exchange timeout has occurred */ 1528 if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) { 1529 /* complete the data exchange transaction, if exists */ 1530 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 1531 nci_data_exchange_complete(ndev, NULL, 1532 ndev->cur_conn_id, 1533 -ETIMEDOUT); 1534 1535 clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); 1536 } 1537 } 1538 1539 /* ----- NCI TX CMD worker thread ----- */ 1540 1541 static void nci_cmd_work(struct work_struct *work) 1542 { 1543 struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work); 1544 struct sk_buff *skb; 1545 1546 pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt)); 1547 1548 /* Send queued command */ 1549 if (atomic_read(&ndev->cmd_cnt)) { 1550 skb = skb_dequeue(&ndev->cmd_q); 1551 if (!skb) 1552 return; 1553 1554 atomic_dec(&ndev->cmd_cnt); 1555 1556 pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n", 1557 nci_pbf(skb->data), 1558 nci_opcode_gid(nci_opcode(skb->data)), 1559 nci_opcode_oid(nci_opcode(skb->data)), 1560 nci_plen(skb->data)); 1561 1562 nci_send_frame(ndev, skb); 1563 1564 mod_timer(&ndev->cmd_timer, 1565 jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT)); 1566 } 1567 } 1568 1569 MODULE_LICENSE("GPL"); 1570