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