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