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 del_timer_sync(&ndev->cmd_timer); 564 del_timer_sync(&ndev->data_timer); 565 mutex_unlock(&ndev->req_lock); 566 return 0; 567 } 568 569 /* Drop RX and TX queues */ 570 skb_queue_purge(&ndev->rx_q); 571 skb_queue_purge(&ndev->tx_q); 572 573 /* Flush RX and TX wq */ 574 flush_workqueue(ndev->rx_wq); 575 flush_workqueue(ndev->tx_wq); 576 577 /* Reset device */ 578 skb_queue_purge(&ndev->cmd_q); 579 atomic_set(&ndev->cmd_cnt, 1); 580 581 set_bit(NCI_INIT, &ndev->flags); 582 __nci_request(ndev, nci_reset_req, (void *)0, 583 msecs_to_jiffies(NCI_RESET_TIMEOUT)); 584 585 /* After this point our queues are empty 586 * and no works are scheduled. 587 */ 588 ndev->ops->close(ndev); 589 590 clear_bit(NCI_INIT, &ndev->flags); 591 592 /* Flush cmd wq */ 593 flush_workqueue(ndev->cmd_wq); 594 595 del_timer_sync(&ndev->cmd_timer); 596 597 /* Clear flags except NCI_UNREG */ 598 ndev->flags &= BIT(NCI_UNREG); 599 600 mutex_unlock(&ndev->req_lock); 601 602 return 0; 603 } 604 605 /* NCI command timer function */ 606 static void nci_cmd_timer(struct timer_list *t) 607 { 608 struct nci_dev *ndev = from_timer(ndev, t, cmd_timer); 609 610 atomic_set(&ndev->cmd_cnt, 1); 611 queue_work(ndev->cmd_wq, &ndev->cmd_work); 612 } 613 614 /* NCI data exchange timer function */ 615 static void nci_data_timer(struct timer_list *t) 616 { 617 struct nci_dev *ndev = from_timer(ndev, t, data_timer); 618 619 set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); 620 queue_work(ndev->rx_wq, &ndev->rx_work); 621 } 622 623 static int nci_dev_up(struct nfc_dev *nfc_dev) 624 { 625 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 626 627 return nci_open_device(ndev); 628 } 629 630 static int nci_dev_down(struct nfc_dev *nfc_dev) 631 { 632 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 633 634 return nci_close_device(ndev); 635 } 636 637 int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, const __u8 *val) 638 { 639 struct nci_set_config_param param; 640 641 if (!val || !len) 642 return 0; 643 644 param.id = id; 645 param.len = len; 646 param.val = val; 647 648 return __nci_request(ndev, nci_set_config_req, ¶m, 649 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT)); 650 } 651 EXPORT_SYMBOL(nci_set_config); 652 653 static void nci_nfcee_discover_req(struct nci_dev *ndev, const void *opt) 654 { 655 struct nci_nfcee_discover_cmd cmd; 656 __u8 action = (unsigned long)opt; 657 658 cmd.discovery_action = action; 659 660 nci_send_cmd(ndev, NCI_OP_NFCEE_DISCOVER_CMD, 1, &cmd); 661 } 662 663 int nci_nfcee_discover(struct nci_dev *ndev, u8 action) 664 { 665 unsigned long opt = action; 666 667 return __nci_request(ndev, nci_nfcee_discover_req, (void *)opt, 668 msecs_to_jiffies(NCI_CMD_TIMEOUT)); 669 } 670 EXPORT_SYMBOL(nci_nfcee_discover); 671 672 static void nci_nfcee_mode_set_req(struct nci_dev *ndev, const void *opt) 673 { 674 const struct nci_nfcee_mode_set_cmd *cmd = opt; 675 676 nci_send_cmd(ndev, NCI_OP_NFCEE_MODE_SET_CMD, 677 sizeof(struct nci_nfcee_mode_set_cmd), cmd); 678 } 679 680 int nci_nfcee_mode_set(struct nci_dev *ndev, u8 nfcee_id, u8 nfcee_mode) 681 { 682 struct nci_nfcee_mode_set_cmd cmd; 683 684 cmd.nfcee_id = nfcee_id; 685 cmd.nfcee_mode = nfcee_mode; 686 687 return __nci_request(ndev, nci_nfcee_mode_set_req, &cmd, 688 msecs_to_jiffies(NCI_CMD_TIMEOUT)); 689 } 690 EXPORT_SYMBOL(nci_nfcee_mode_set); 691 692 static void nci_core_conn_create_req(struct nci_dev *ndev, const void *opt) 693 { 694 const struct core_conn_create_data *data = opt; 695 696 nci_send_cmd(ndev, NCI_OP_CORE_CONN_CREATE_CMD, data->length, data->cmd); 697 } 698 699 int nci_core_conn_create(struct nci_dev *ndev, u8 destination_type, 700 u8 number_destination_params, 701 size_t params_len, 702 const struct core_conn_create_dest_spec_params *params) 703 { 704 int r; 705 struct nci_core_conn_create_cmd *cmd; 706 struct core_conn_create_data data; 707 708 data.length = params_len + sizeof(struct nci_core_conn_create_cmd); 709 cmd = kzalloc(data.length, GFP_KERNEL); 710 if (!cmd) 711 return -ENOMEM; 712 713 cmd->destination_type = destination_type; 714 cmd->number_destination_params = number_destination_params; 715 716 data.cmd = cmd; 717 718 if (params) { 719 memcpy(cmd->params, params, params_len); 720 if (params->length > 0) 721 memcpy(&ndev->cur_params, 722 ¶ms->value[DEST_SPEC_PARAMS_ID_INDEX], 723 sizeof(struct dest_spec_params)); 724 else 725 ndev->cur_params.id = 0; 726 } else { 727 ndev->cur_params.id = 0; 728 } 729 ndev->cur_dest_type = destination_type; 730 731 r = __nci_request(ndev, nci_core_conn_create_req, &data, 732 msecs_to_jiffies(NCI_CMD_TIMEOUT)); 733 kfree(cmd); 734 return r; 735 } 736 EXPORT_SYMBOL(nci_core_conn_create); 737 738 static void nci_core_conn_close_req(struct nci_dev *ndev, const void *opt) 739 { 740 __u8 conn_id = (unsigned long)opt; 741 742 nci_send_cmd(ndev, NCI_OP_CORE_CONN_CLOSE_CMD, 1, &conn_id); 743 } 744 745 int nci_core_conn_close(struct nci_dev *ndev, u8 conn_id) 746 { 747 unsigned long opt = conn_id; 748 749 ndev->cur_conn_id = conn_id; 750 return __nci_request(ndev, nci_core_conn_close_req, (void *)opt, 751 msecs_to_jiffies(NCI_CMD_TIMEOUT)); 752 } 753 EXPORT_SYMBOL(nci_core_conn_close); 754 755 static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev) 756 { 757 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 758 struct nci_set_config_param param; 759 int rc; 760 761 param.val = nfc_get_local_general_bytes(nfc_dev, ¶m.len); 762 if ((param.val == NULL) || (param.len == 0)) 763 return 0; 764 765 if (param.len > NFC_MAX_GT_LEN) 766 return -EINVAL; 767 768 param.id = NCI_PN_ATR_REQ_GEN_BYTES; 769 770 rc = nci_request(ndev, nci_set_config_req, ¶m, 771 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT)); 772 if (rc) 773 return rc; 774 775 param.id = NCI_LN_ATR_RES_GEN_BYTES; 776 777 return nci_request(ndev, nci_set_config_req, ¶m, 778 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT)); 779 } 780 781 static int nci_set_listen_parameters(struct nfc_dev *nfc_dev) 782 { 783 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 784 int rc; 785 __u8 val; 786 787 val = NCI_LA_SEL_INFO_NFC_DEP_MASK; 788 789 rc = nci_set_config(ndev, NCI_LA_SEL_INFO, 1, &val); 790 if (rc) 791 return rc; 792 793 val = NCI_LF_PROTOCOL_TYPE_NFC_DEP_MASK; 794 795 rc = nci_set_config(ndev, NCI_LF_PROTOCOL_TYPE, 1, &val); 796 if (rc) 797 return rc; 798 799 val = NCI_LF_CON_BITR_F_212 | NCI_LF_CON_BITR_F_424; 800 801 return nci_set_config(ndev, NCI_LF_CON_BITR_F, 1, &val); 802 } 803 804 static int nci_start_poll(struct nfc_dev *nfc_dev, 805 __u32 im_protocols, __u32 tm_protocols) 806 { 807 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 808 struct nci_rf_discover_param param; 809 int rc; 810 811 if ((atomic_read(&ndev->state) == NCI_DISCOVERY) || 812 (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) { 813 pr_err("unable to start poll, since poll is already active\n"); 814 return -EBUSY; 815 } 816 817 if (ndev->target_active_prot) { 818 pr_err("there is an active target\n"); 819 return -EBUSY; 820 } 821 822 if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) || 823 (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) { 824 pr_debug("target active or w4 select, implicitly deactivate\n"); 825 826 rc = nci_request(ndev, nci_rf_deactivate_req, 827 (void *)NCI_DEACTIVATE_TYPE_IDLE_MODE, 828 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 829 if (rc) 830 return -EBUSY; 831 } 832 833 if ((im_protocols | tm_protocols) & NFC_PROTO_NFC_DEP_MASK) { 834 rc = nci_set_local_general_bytes(nfc_dev); 835 if (rc) { 836 pr_err("failed to set local general bytes\n"); 837 return rc; 838 } 839 } 840 841 if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) { 842 rc = nci_set_listen_parameters(nfc_dev); 843 if (rc) 844 pr_err("failed to set listen parameters\n"); 845 } 846 847 param.im_protocols = im_protocols; 848 param.tm_protocols = tm_protocols; 849 rc = nci_request(ndev, nci_rf_discover_req, ¶m, 850 msecs_to_jiffies(NCI_RF_DISC_TIMEOUT)); 851 852 if (!rc) 853 ndev->poll_prots = im_protocols; 854 855 return rc; 856 } 857 858 static void nci_stop_poll(struct nfc_dev *nfc_dev) 859 { 860 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 861 862 if ((atomic_read(&ndev->state) != NCI_DISCOVERY) && 863 (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) { 864 pr_err("unable to stop poll, since poll is not active\n"); 865 return; 866 } 867 868 nci_request(ndev, nci_rf_deactivate_req, 869 (void *)NCI_DEACTIVATE_TYPE_IDLE_MODE, 870 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 871 } 872 873 static int nci_activate_target(struct nfc_dev *nfc_dev, 874 struct nfc_target *target, __u32 protocol) 875 { 876 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 877 struct nci_rf_discover_select_param param; 878 const struct nfc_target *nci_target = NULL; 879 int i; 880 int rc = 0; 881 882 pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol); 883 884 if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) && 885 (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) { 886 pr_err("there is no available target to activate\n"); 887 return -EINVAL; 888 } 889 890 if (ndev->target_active_prot) { 891 pr_err("there is already an active target\n"); 892 return -EBUSY; 893 } 894 895 for (i = 0; i < ndev->n_targets; i++) { 896 if (ndev->targets[i].idx == target->idx) { 897 nci_target = &ndev->targets[i]; 898 break; 899 } 900 } 901 902 if (!nci_target) { 903 pr_err("unable to find the selected target\n"); 904 return -EINVAL; 905 } 906 907 if (!(nci_target->supported_protocols & (1 << protocol))) { 908 pr_err("target does not support the requested protocol 0x%x\n", 909 protocol); 910 return -EINVAL; 911 } 912 913 if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) { 914 param.rf_discovery_id = nci_target->logical_idx; 915 916 if (protocol == NFC_PROTO_JEWEL) 917 param.rf_protocol = NCI_RF_PROTOCOL_T1T; 918 else if (protocol == NFC_PROTO_MIFARE) 919 param.rf_protocol = NCI_RF_PROTOCOL_T2T; 920 else if (protocol == NFC_PROTO_FELICA) 921 param.rf_protocol = NCI_RF_PROTOCOL_T3T; 922 else if (protocol == NFC_PROTO_ISO14443 || 923 protocol == NFC_PROTO_ISO14443_B) 924 param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP; 925 else 926 param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP; 927 928 rc = nci_request(ndev, nci_rf_discover_select_req, ¶m, 929 msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT)); 930 } 931 932 if (!rc) 933 ndev->target_active_prot = protocol; 934 935 return rc; 936 } 937 938 static void nci_deactivate_target(struct nfc_dev *nfc_dev, 939 struct nfc_target *target, 940 __u8 mode) 941 { 942 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 943 unsigned long nci_mode = NCI_DEACTIVATE_TYPE_IDLE_MODE; 944 945 if (!ndev->target_active_prot) { 946 pr_err("unable to deactivate target, no active target\n"); 947 return; 948 } 949 950 ndev->target_active_prot = 0; 951 952 switch (mode) { 953 case NFC_TARGET_MODE_SLEEP: 954 nci_mode = NCI_DEACTIVATE_TYPE_SLEEP_MODE; 955 break; 956 } 957 958 if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) { 959 nci_request(ndev, nci_rf_deactivate_req, (void *)nci_mode, 960 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 961 } 962 } 963 964 static int nci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target, 965 __u8 comm_mode, __u8 *gb, size_t gb_len) 966 { 967 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 968 int rc; 969 970 pr_debug("target_idx %d, comm_mode %d\n", target->idx, comm_mode); 971 972 rc = nci_activate_target(nfc_dev, target, NFC_PROTO_NFC_DEP); 973 if (rc) 974 return rc; 975 976 rc = nfc_set_remote_general_bytes(nfc_dev, ndev->remote_gb, 977 ndev->remote_gb_len); 978 if (!rc) 979 rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_PASSIVE, 980 NFC_RF_INITIATOR); 981 982 return rc; 983 } 984 985 static int nci_dep_link_down(struct nfc_dev *nfc_dev) 986 { 987 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 988 int rc; 989 990 if (nfc_dev->rf_mode == NFC_RF_INITIATOR) { 991 nci_deactivate_target(nfc_dev, NULL, NCI_DEACTIVATE_TYPE_IDLE_MODE); 992 } else { 993 if (atomic_read(&ndev->state) == NCI_LISTEN_ACTIVE || 994 atomic_read(&ndev->state) == NCI_DISCOVERY) { 995 nci_request(ndev, nci_rf_deactivate_req, (void *)0, 996 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 997 } 998 999 rc = nfc_tm_deactivated(nfc_dev); 1000 if (rc) 1001 pr_err("error when signaling tm deactivation\n"); 1002 } 1003 1004 return 0; 1005 } 1006 1007 1008 static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target, 1009 struct sk_buff *skb, 1010 data_exchange_cb_t cb, void *cb_context) 1011 { 1012 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 1013 int rc; 1014 struct nci_conn_info *conn_info; 1015 1016 conn_info = ndev->rf_conn_info; 1017 if (!conn_info) 1018 return -EPROTO; 1019 1020 pr_debug("target_idx %d, len %d\n", target->idx, skb->len); 1021 1022 if (!ndev->target_active_prot) { 1023 pr_err("unable to exchange data, no active target\n"); 1024 return -EINVAL; 1025 } 1026 1027 if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 1028 return -EBUSY; 1029 1030 /* store cb and context to be used on receiving data */ 1031 conn_info->data_exchange_cb = cb; 1032 conn_info->data_exchange_cb_context = cb_context; 1033 1034 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb); 1035 if (rc) 1036 clear_bit(NCI_DATA_EXCHANGE, &ndev->flags); 1037 1038 return rc; 1039 } 1040 1041 static int nci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb) 1042 { 1043 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 1044 int rc; 1045 1046 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb); 1047 if (rc) 1048 pr_err("unable to send data\n"); 1049 1050 return rc; 1051 } 1052 1053 static int nci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx) 1054 { 1055 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 1056 1057 if (ndev->ops->enable_se) 1058 return ndev->ops->enable_se(ndev, se_idx); 1059 1060 return 0; 1061 } 1062 1063 static int nci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx) 1064 { 1065 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 1066 1067 if (ndev->ops->disable_se) 1068 return ndev->ops->disable_se(ndev, se_idx); 1069 1070 return 0; 1071 } 1072 1073 static int nci_discover_se(struct nfc_dev *nfc_dev) 1074 { 1075 int r; 1076 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 1077 1078 if (ndev->ops->discover_se) { 1079 r = nci_nfcee_discover(ndev, NCI_NFCEE_DISCOVERY_ACTION_ENABLE); 1080 if (r != NCI_STATUS_OK) 1081 return -EPROTO; 1082 1083 return ndev->ops->discover_se(ndev); 1084 } 1085 1086 return 0; 1087 } 1088 1089 static int nci_se_io(struct nfc_dev *nfc_dev, u32 se_idx, 1090 u8 *apdu, size_t apdu_length, 1091 se_io_cb_t cb, void *cb_context) 1092 { 1093 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 1094 1095 if (ndev->ops->se_io) 1096 return ndev->ops->se_io(ndev, se_idx, apdu, 1097 apdu_length, cb, cb_context); 1098 1099 return 0; 1100 } 1101 1102 static int nci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name) 1103 { 1104 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 1105 1106 if (!ndev->ops->fw_download) 1107 return -ENOTSUPP; 1108 1109 return ndev->ops->fw_download(ndev, firmware_name); 1110 } 1111 1112 static const struct nfc_ops nci_nfc_ops = { 1113 .dev_up = nci_dev_up, 1114 .dev_down = nci_dev_down, 1115 .start_poll = nci_start_poll, 1116 .stop_poll = nci_stop_poll, 1117 .dep_link_up = nci_dep_link_up, 1118 .dep_link_down = nci_dep_link_down, 1119 .activate_target = nci_activate_target, 1120 .deactivate_target = nci_deactivate_target, 1121 .im_transceive = nci_transceive, 1122 .tm_send = nci_tm_send, 1123 .enable_se = nci_enable_se, 1124 .disable_se = nci_disable_se, 1125 .discover_se = nci_discover_se, 1126 .se_io = nci_se_io, 1127 .fw_download = nci_fw_download, 1128 }; 1129 1130 /* ---- Interface to NCI drivers ---- */ 1131 /** 1132 * nci_allocate_device - allocate a new nci device 1133 * 1134 * @ops: device operations 1135 * @supported_protocols: NFC protocols supported by the device 1136 * @tx_headroom: Reserved space at beginning of skb 1137 * @tx_tailroom: Reserved space at end of skb 1138 */ 1139 struct nci_dev *nci_allocate_device(const struct nci_ops *ops, 1140 __u32 supported_protocols, 1141 int tx_headroom, int tx_tailroom) 1142 { 1143 struct nci_dev *ndev; 1144 1145 pr_debug("supported_protocols 0x%x\n", supported_protocols); 1146 1147 if (!ops->open || !ops->close || !ops->send) 1148 return NULL; 1149 1150 if (!supported_protocols) 1151 return NULL; 1152 1153 ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL); 1154 if (!ndev) 1155 return NULL; 1156 1157 ndev->ops = ops; 1158 1159 if (ops->n_prop_ops > NCI_MAX_PROPRIETARY_CMD) { 1160 pr_err("Too many proprietary commands: %zd\n", 1161 ops->n_prop_ops); 1162 goto free_nci; 1163 } 1164 1165 ndev->tx_headroom = tx_headroom; 1166 ndev->tx_tailroom = tx_tailroom; 1167 init_completion(&ndev->req_completion); 1168 1169 ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops, 1170 supported_protocols, 1171 tx_headroom + NCI_DATA_HDR_SIZE, 1172 tx_tailroom); 1173 if (!ndev->nfc_dev) 1174 goto free_nci; 1175 1176 ndev->hci_dev = nci_hci_allocate(ndev); 1177 if (!ndev->hci_dev) 1178 goto free_nfc; 1179 1180 nfc_set_drvdata(ndev->nfc_dev, ndev); 1181 1182 return ndev; 1183 1184 free_nfc: 1185 nfc_free_device(ndev->nfc_dev); 1186 free_nci: 1187 kfree(ndev); 1188 return NULL; 1189 } 1190 EXPORT_SYMBOL(nci_allocate_device); 1191 1192 /** 1193 * nci_free_device - deallocate nci device 1194 * 1195 * @ndev: The nci device to deallocate 1196 */ 1197 void nci_free_device(struct nci_dev *ndev) 1198 { 1199 nfc_free_device(ndev->nfc_dev); 1200 nci_hci_deallocate(ndev); 1201 kfree(ndev); 1202 } 1203 EXPORT_SYMBOL(nci_free_device); 1204 1205 /** 1206 * nci_register_device - register a nci device in the nfc subsystem 1207 * 1208 * @ndev: The nci device to register 1209 */ 1210 int nci_register_device(struct nci_dev *ndev) 1211 { 1212 int rc; 1213 struct device *dev = &ndev->nfc_dev->dev; 1214 char name[32]; 1215 1216 ndev->flags = 0; 1217 1218 INIT_WORK(&ndev->cmd_work, nci_cmd_work); 1219 snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev)); 1220 ndev->cmd_wq = create_singlethread_workqueue(name); 1221 if (!ndev->cmd_wq) { 1222 rc = -ENOMEM; 1223 goto exit; 1224 } 1225 1226 INIT_WORK(&ndev->rx_work, nci_rx_work); 1227 snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev)); 1228 ndev->rx_wq = create_singlethread_workqueue(name); 1229 if (!ndev->rx_wq) { 1230 rc = -ENOMEM; 1231 goto destroy_cmd_wq_exit; 1232 } 1233 1234 INIT_WORK(&ndev->tx_work, nci_tx_work); 1235 snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev)); 1236 ndev->tx_wq = create_singlethread_workqueue(name); 1237 if (!ndev->tx_wq) { 1238 rc = -ENOMEM; 1239 goto destroy_rx_wq_exit; 1240 } 1241 1242 skb_queue_head_init(&ndev->cmd_q); 1243 skb_queue_head_init(&ndev->rx_q); 1244 skb_queue_head_init(&ndev->tx_q); 1245 1246 timer_setup(&ndev->cmd_timer, nci_cmd_timer, 0); 1247 timer_setup(&ndev->data_timer, nci_data_timer, 0); 1248 1249 mutex_init(&ndev->req_lock); 1250 INIT_LIST_HEAD(&ndev->conn_info_list); 1251 1252 rc = nfc_register_device(ndev->nfc_dev); 1253 if (rc) 1254 goto destroy_tx_wq_exit; 1255 1256 goto exit; 1257 1258 destroy_tx_wq_exit: 1259 destroy_workqueue(ndev->tx_wq); 1260 1261 destroy_rx_wq_exit: 1262 destroy_workqueue(ndev->rx_wq); 1263 1264 destroy_cmd_wq_exit: 1265 destroy_workqueue(ndev->cmd_wq); 1266 1267 exit: 1268 return rc; 1269 } 1270 EXPORT_SYMBOL(nci_register_device); 1271 1272 /** 1273 * nci_unregister_device - unregister a nci device in the nfc subsystem 1274 * 1275 * @ndev: The nci device to unregister 1276 */ 1277 void nci_unregister_device(struct nci_dev *ndev) 1278 { 1279 struct nci_conn_info *conn_info, *n; 1280 1281 /* This set_bit is not protected with specialized barrier, 1282 * However, it is fine because the mutex_lock(&ndev->req_lock); 1283 * in nci_close_device() will help to emit one. 1284 */ 1285 set_bit(NCI_UNREG, &ndev->flags); 1286 1287 nci_close_device(ndev); 1288 1289 destroy_workqueue(ndev->cmd_wq); 1290 destroy_workqueue(ndev->rx_wq); 1291 destroy_workqueue(ndev->tx_wq); 1292 1293 list_for_each_entry_safe(conn_info, n, &ndev->conn_info_list, list) { 1294 list_del(&conn_info->list); 1295 /* conn_info is allocated with devm_kzalloc */ 1296 } 1297 1298 nfc_unregister_device(ndev->nfc_dev); 1299 } 1300 EXPORT_SYMBOL(nci_unregister_device); 1301 1302 /** 1303 * nci_recv_frame - receive frame from NCI drivers 1304 * 1305 * @ndev: The nci device 1306 * @skb: The sk_buff to receive 1307 */ 1308 int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb) 1309 { 1310 pr_debug("len %d\n", skb->len); 1311 1312 if (!ndev || (!test_bit(NCI_UP, &ndev->flags) && 1313 !test_bit(NCI_INIT, &ndev->flags))) { 1314 kfree_skb(skb); 1315 return -ENXIO; 1316 } 1317 1318 /* Queue frame for rx worker thread */ 1319 skb_queue_tail(&ndev->rx_q, skb); 1320 queue_work(ndev->rx_wq, &ndev->rx_work); 1321 1322 return 0; 1323 } 1324 EXPORT_SYMBOL(nci_recv_frame); 1325 1326 int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb) 1327 { 1328 pr_debug("len %d\n", skb->len); 1329 1330 if (!ndev) { 1331 kfree_skb(skb); 1332 return -ENODEV; 1333 } 1334 1335 /* Get rid of skb owner, prior to sending to the driver. */ 1336 skb_orphan(skb); 1337 1338 /* Send copy to sniffer */ 1339 nfc_send_to_raw_sock(ndev->nfc_dev, skb, 1340 RAW_PAYLOAD_NCI, NFC_DIRECTION_TX); 1341 1342 return ndev->ops->send(ndev, skb); 1343 } 1344 EXPORT_SYMBOL(nci_send_frame); 1345 1346 /* Send NCI command */ 1347 int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, const void *payload) 1348 { 1349 struct nci_ctrl_hdr *hdr; 1350 struct sk_buff *skb; 1351 1352 pr_debug("opcode 0x%x, plen %d\n", opcode, plen); 1353 1354 skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL); 1355 if (!skb) { 1356 pr_err("no memory for command\n"); 1357 return -ENOMEM; 1358 } 1359 1360 hdr = skb_put(skb, NCI_CTRL_HDR_SIZE); 1361 hdr->gid = nci_opcode_gid(opcode); 1362 hdr->oid = nci_opcode_oid(opcode); 1363 hdr->plen = plen; 1364 1365 nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT); 1366 nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST); 1367 1368 if (plen) 1369 skb_put_data(skb, payload, plen); 1370 1371 skb_queue_tail(&ndev->cmd_q, skb); 1372 queue_work(ndev->cmd_wq, &ndev->cmd_work); 1373 1374 return 0; 1375 } 1376 EXPORT_SYMBOL(nci_send_cmd); 1377 1378 /* Proprietary commands API */ 1379 static const struct nci_driver_ops *ops_cmd_lookup(const struct nci_driver_ops *ops, 1380 size_t n_ops, 1381 __u16 opcode) 1382 { 1383 size_t i; 1384 const struct nci_driver_ops *op; 1385 1386 if (!ops || !n_ops) 1387 return NULL; 1388 1389 for (i = 0; i < n_ops; i++) { 1390 op = &ops[i]; 1391 if (op->opcode == opcode) 1392 return op; 1393 } 1394 1395 return NULL; 1396 } 1397 1398 static int nci_op_rsp_packet(struct nci_dev *ndev, __u16 rsp_opcode, 1399 struct sk_buff *skb, const struct nci_driver_ops *ops, 1400 size_t n_ops) 1401 { 1402 const struct nci_driver_ops *op; 1403 1404 op = ops_cmd_lookup(ops, n_ops, rsp_opcode); 1405 if (!op || !op->rsp) 1406 return -ENOTSUPP; 1407 1408 return op->rsp(ndev, skb); 1409 } 1410 1411 static int nci_op_ntf_packet(struct nci_dev *ndev, __u16 ntf_opcode, 1412 struct sk_buff *skb, const struct nci_driver_ops *ops, 1413 size_t n_ops) 1414 { 1415 const struct nci_driver_ops *op; 1416 1417 op = ops_cmd_lookup(ops, n_ops, ntf_opcode); 1418 if (!op || !op->ntf) 1419 return -ENOTSUPP; 1420 1421 return op->ntf(ndev, skb); 1422 } 1423 1424 int nci_prop_rsp_packet(struct nci_dev *ndev, __u16 opcode, 1425 struct sk_buff *skb) 1426 { 1427 return nci_op_rsp_packet(ndev, opcode, skb, ndev->ops->prop_ops, 1428 ndev->ops->n_prop_ops); 1429 } 1430 1431 int nci_prop_ntf_packet(struct nci_dev *ndev, __u16 opcode, 1432 struct sk_buff *skb) 1433 { 1434 return nci_op_ntf_packet(ndev, opcode, skb, ndev->ops->prop_ops, 1435 ndev->ops->n_prop_ops); 1436 } 1437 1438 int nci_core_rsp_packet(struct nci_dev *ndev, __u16 opcode, 1439 struct sk_buff *skb) 1440 { 1441 return nci_op_rsp_packet(ndev, opcode, skb, ndev->ops->core_ops, 1442 ndev->ops->n_core_ops); 1443 } 1444 1445 int nci_core_ntf_packet(struct nci_dev *ndev, __u16 opcode, 1446 struct sk_buff *skb) 1447 { 1448 return nci_op_ntf_packet(ndev, opcode, skb, ndev->ops->core_ops, 1449 ndev->ops->n_core_ops); 1450 } 1451 1452 /* ---- NCI TX Data worker thread ---- */ 1453 1454 static void nci_tx_work(struct work_struct *work) 1455 { 1456 struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work); 1457 struct nci_conn_info *conn_info; 1458 struct sk_buff *skb; 1459 1460 conn_info = nci_get_conn_info_by_conn_id(ndev, ndev->cur_conn_id); 1461 if (!conn_info) 1462 return; 1463 1464 pr_debug("credits_cnt %d\n", atomic_read(&conn_info->credits_cnt)); 1465 1466 /* Send queued tx data */ 1467 while (atomic_read(&conn_info->credits_cnt)) { 1468 skb = skb_dequeue(&ndev->tx_q); 1469 if (!skb) 1470 return; 1471 1472 /* Check if data flow control is used */ 1473 if (atomic_read(&conn_info->credits_cnt) != 1474 NCI_DATA_FLOW_CONTROL_NOT_USED) 1475 atomic_dec(&conn_info->credits_cnt); 1476 1477 pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n", 1478 nci_pbf(skb->data), 1479 nci_conn_id(skb->data), 1480 nci_plen(skb->data)); 1481 1482 nci_send_frame(ndev, skb); 1483 1484 mod_timer(&ndev->data_timer, 1485 jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT)); 1486 } 1487 } 1488 1489 /* ----- NCI RX worker thread (data & control) ----- */ 1490 1491 static void nci_rx_work(struct work_struct *work) 1492 { 1493 struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work); 1494 struct sk_buff *skb; 1495 1496 while ((skb = skb_dequeue(&ndev->rx_q))) { 1497 1498 /* Send copy to sniffer */ 1499 nfc_send_to_raw_sock(ndev->nfc_dev, skb, 1500 RAW_PAYLOAD_NCI, NFC_DIRECTION_RX); 1501 1502 /* Process frame */ 1503 switch (nci_mt(skb->data)) { 1504 case NCI_MT_RSP_PKT: 1505 nci_rsp_packet(ndev, skb); 1506 break; 1507 1508 case NCI_MT_NTF_PKT: 1509 nci_ntf_packet(ndev, skb); 1510 break; 1511 1512 case NCI_MT_DATA_PKT: 1513 nci_rx_data_packet(ndev, skb); 1514 break; 1515 1516 default: 1517 pr_err("unknown MT 0x%x\n", nci_mt(skb->data)); 1518 kfree_skb(skb); 1519 break; 1520 } 1521 } 1522 1523 /* check if a data exchange timeout has occurred */ 1524 if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) { 1525 /* complete the data exchange transaction, if exists */ 1526 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 1527 nci_data_exchange_complete(ndev, NULL, 1528 ndev->cur_conn_id, 1529 -ETIMEDOUT); 1530 1531 clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); 1532 } 1533 } 1534 1535 /* ----- NCI TX CMD worker thread ----- */ 1536 1537 static void nci_cmd_work(struct work_struct *work) 1538 { 1539 struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work); 1540 struct sk_buff *skb; 1541 1542 pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt)); 1543 1544 /* Send queued command */ 1545 if (atomic_read(&ndev->cmd_cnt)) { 1546 skb = skb_dequeue(&ndev->cmd_q); 1547 if (!skb) 1548 return; 1549 1550 atomic_dec(&ndev->cmd_cnt); 1551 1552 pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n", 1553 nci_pbf(skb->data), 1554 nci_opcode_gid(nci_opcode(skb->data)), 1555 nci_opcode_oid(nci_opcode(skb->data)), 1556 nci_plen(skb->data)); 1557 1558 nci_send_frame(ndev, skb); 1559 1560 mod_timer(&ndev->cmd_timer, 1561 jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT)); 1562 } 1563 } 1564 1565 MODULE_LICENSE("GPL"); 1566