1 /* 2 * The NFC Controller Interface is the communication protocol between an 3 * NFC Controller (NFCC) and a Device Host (DH). 4 * 5 * Copyright (C) 2011 Texas Instruments, Inc. 6 * Copyright (C) 2014 Marvell International Ltd. 7 * 8 * Written by Ilan Elias <ilane@ti.com> 9 * 10 * Acknowledgements: 11 * This file is based on hci_core.c, which was written 12 * by Maxim Krasnyansky. 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License version 2 16 * as published by the Free Software Foundation 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program; if not, see <http://www.gnu.org/licenses/>. 25 * 26 */ 27 28 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ 29 30 #include <linux/module.h> 31 #include <linux/kernel.h> 32 #include <linux/types.h> 33 #include <linux/workqueue.h> 34 #include <linux/completion.h> 35 #include <linux/export.h> 36 #include <linux/sched.h> 37 #include <linux/bitops.h> 38 #include <linux/skbuff.h> 39 40 #include "../nfc.h" 41 #include <net/nfc/nci.h> 42 #include <net/nfc/nci_core.h> 43 #include <linux/nfc.h> 44 45 struct core_conn_create_data { 46 int length; 47 struct nci_core_conn_create_cmd *cmd; 48 }; 49 50 static void nci_cmd_work(struct work_struct *work); 51 static void nci_rx_work(struct work_struct *work); 52 static void nci_tx_work(struct work_struct *work); 53 54 struct nci_conn_info *nci_get_conn_info_by_conn_id(struct nci_dev *ndev, 55 int conn_id) 56 { 57 struct nci_conn_info *conn_info; 58 59 list_for_each_entry(conn_info, &ndev->conn_info_list, list) { 60 if (conn_info->conn_id == conn_id) 61 return conn_info; 62 } 63 64 return NULL; 65 } 66 67 int nci_get_conn_info_by_dest_type_params(struct nci_dev *ndev, u8 dest_type, 68 struct dest_spec_params *params) 69 { 70 struct nci_conn_info *conn_info; 71 72 list_for_each_entry(conn_info, &ndev->conn_info_list, list) { 73 if (conn_info->dest_type == dest_type) { 74 if (!params) 75 return conn_info->conn_id; 76 if (conn_info) { 77 if (params->id == conn_info->dest_params->id && 78 params->protocol == conn_info->dest_params->protocol) 79 return conn_info->conn_id; 80 } 81 } 82 } 83 84 return -EINVAL; 85 } 86 EXPORT_SYMBOL(nci_get_conn_info_by_dest_type_params); 87 88 /* ---- NCI requests ---- */ 89 90 void nci_req_complete(struct nci_dev *ndev, int result) 91 { 92 if (ndev->req_status == NCI_REQ_PEND) { 93 ndev->req_result = result; 94 ndev->req_status = NCI_REQ_DONE; 95 complete(&ndev->req_completion); 96 } 97 } 98 EXPORT_SYMBOL(nci_req_complete); 99 100 static void nci_req_cancel(struct nci_dev *ndev, int err) 101 { 102 if (ndev->req_status == NCI_REQ_PEND) { 103 ndev->req_result = err; 104 ndev->req_status = NCI_REQ_CANCELED; 105 complete(&ndev->req_completion); 106 } 107 } 108 109 /* Execute request and wait for completion. */ 110 static int __nci_request(struct nci_dev *ndev, 111 void (*req)(struct nci_dev *ndev, unsigned long opt), 112 unsigned long opt, __u32 timeout) 113 { 114 int rc = 0; 115 long completion_rc; 116 117 ndev->req_status = NCI_REQ_PEND; 118 119 reinit_completion(&ndev->req_completion); 120 req(ndev, opt); 121 completion_rc = 122 wait_for_completion_interruptible_timeout(&ndev->req_completion, 123 timeout); 124 125 pr_debug("wait_for_completion return %ld\n", completion_rc); 126 127 if (completion_rc > 0) { 128 switch (ndev->req_status) { 129 case NCI_REQ_DONE: 130 rc = nci_to_errno(ndev->req_result); 131 break; 132 133 case NCI_REQ_CANCELED: 134 rc = -ndev->req_result; 135 break; 136 137 default: 138 rc = -ETIMEDOUT; 139 break; 140 } 141 } else { 142 pr_err("wait_for_completion_interruptible_timeout failed %ld\n", 143 completion_rc); 144 145 rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc)); 146 } 147 148 ndev->req_status = ndev->req_result = 0; 149 150 return rc; 151 } 152 153 inline int nci_request(struct nci_dev *ndev, 154 void (*req)(struct nci_dev *ndev, 155 unsigned long opt), 156 unsigned long opt, __u32 timeout) 157 { 158 int rc; 159 160 if (!test_bit(NCI_UP, &ndev->flags)) 161 return -ENETDOWN; 162 163 /* Serialize all requests */ 164 mutex_lock(&ndev->req_lock); 165 rc = __nci_request(ndev, req, opt, timeout); 166 mutex_unlock(&ndev->req_lock); 167 168 return rc; 169 } 170 171 static void nci_reset_req(struct nci_dev *ndev, unsigned long opt) 172 { 173 struct nci_core_reset_cmd cmd; 174 175 cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG; 176 nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd); 177 } 178 179 static void nci_init_req(struct nci_dev *ndev, unsigned long opt) 180 { 181 nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL); 182 } 183 184 static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt) 185 { 186 struct nci_rf_disc_map_cmd cmd; 187 struct disc_map_config *cfg = cmd.mapping_configs; 188 __u8 *num = &cmd.num_mapping_configs; 189 int i; 190 191 /* set rf mapping configurations */ 192 *num = 0; 193 194 /* by default mapping is set to NCI_RF_INTERFACE_FRAME */ 195 for (i = 0; i < ndev->num_supported_rf_interfaces; i++) { 196 if (ndev->supported_rf_interfaces[i] == 197 NCI_RF_INTERFACE_ISO_DEP) { 198 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP; 199 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL | 200 NCI_DISC_MAP_MODE_LISTEN; 201 cfg[*num].rf_interface = NCI_RF_INTERFACE_ISO_DEP; 202 (*num)++; 203 } else if (ndev->supported_rf_interfaces[i] == 204 NCI_RF_INTERFACE_NFC_DEP) { 205 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP; 206 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL | 207 NCI_DISC_MAP_MODE_LISTEN; 208 cfg[*num].rf_interface = NCI_RF_INTERFACE_NFC_DEP; 209 (*num)++; 210 } 211 212 if (*num == NCI_MAX_NUM_MAPPING_CONFIGS) 213 break; 214 } 215 216 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD, 217 (1 + ((*num) * sizeof(struct disc_map_config))), &cmd); 218 } 219 220 struct nci_set_config_param { 221 __u8 id; 222 size_t len; 223 __u8 *val; 224 }; 225 226 static void nci_set_config_req(struct nci_dev *ndev, unsigned long opt) 227 { 228 struct nci_set_config_param *param = (struct nci_set_config_param *)opt; 229 struct nci_core_set_config_cmd cmd; 230 231 BUG_ON(param->len > NCI_MAX_PARAM_LEN); 232 233 cmd.num_params = 1; 234 cmd.param.id = param->id; 235 cmd.param.len = param->len; 236 memcpy(cmd.param.val, param->val, param->len); 237 238 nci_send_cmd(ndev, NCI_OP_CORE_SET_CONFIG_CMD, (3 + param->len), &cmd); 239 } 240 241 struct nci_rf_discover_param { 242 __u32 im_protocols; 243 __u32 tm_protocols; 244 }; 245 246 static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt) 247 { 248 struct nci_rf_discover_param *param = 249 (struct nci_rf_discover_param *)opt; 250 struct nci_rf_disc_cmd cmd; 251 252 cmd.num_disc_configs = 0; 253 254 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 255 (param->im_protocols & NFC_PROTO_JEWEL_MASK || 256 param->im_protocols & NFC_PROTO_MIFARE_MASK || 257 param->im_protocols & NFC_PROTO_ISO14443_MASK || 258 param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) { 259 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 260 NCI_NFC_A_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_ISO14443_B_MASK)) { 267 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 268 NCI_NFC_B_PASSIVE_POLL_MODE; 269 cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 270 cmd.num_disc_configs++; 271 } 272 273 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 274 (param->im_protocols & NFC_PROTO_FELICA_MASK || 275 param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) { 276 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 277 NCI_NFC_F_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) && 283 (param->im_protocols & NFC_PROTO_ISO15693_MASK)) { 284 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 285 NCI_NFC_V_PASSIVE_POLL_MODE; 286 cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 287 cmd.num_disc_configs++; 288 } 289 290 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS - 1) && 291 (param->tm_protocols & NFC_PROTO_NFC_DEP_MASK)) { 292 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 293 NCI_NFC_A_PASSIVE_LISTEN_MODE; 294 cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 295 cmd.num_disc_configs++; 296 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 297 NCI_NFC_F_PASSIVE_LISTEN_MODE; 298 cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 299 cmd.num_disc_configs++; 300 } 301 302 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD, 303 (1 + (cmd.num_disc_configs * sizeof(struct disc_config))), 304 &cmd); 305 } 306 307 struct nci_rf_discover_select_param { 308 __u8 rf_discovery_id; 309 __u8 rf_protocol; 310 }; 311 312 static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt) 313 { 314 struct nci_rf_discover_select_param *param = 315 (struct nci_rf_discover_select_param *)opt; 316 struct nci_rf_discover_select_cmd cmd; 317 318 cmd.rf_discovery_id = param->rf_discovery_id; 319 cmd.rf_protocol = param->rf_protocol; 320 321 switch (cmd.rf_protocol) { 322 case NCI_RF_PROTOCOL_ISO_DEP: 323 cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP; 324 break; 325 326 case NCI_RF_PROTOCOL_NFC_DEP: 327 cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP; 328 break; 329 330 default: 331 cmd.rf_interface = NCI_RF_INTERFACE_FRAME; 332 break; 333 } 334 335 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD, 336 sizeof(struct nci_rf_discover_select_cmd), &cmd); 337 } 338 339 static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt) 340 { 341 struct nci_rf_deactivate_cmd cmd; 342 343 cmd.type = opt; 344 345 nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD, 346 sizeof(struct nci_rf_deactivate_cmd), &cmd); 347 } 348 349 struct nci_cmd_param { 350 __u16 opcode; 351 size_t len; 352 __u8 *payload; 353 }; 354 355 static void nci_generic_req(struct nci_dev *ndev, unsigned long opt) 356 { 357 struct nci_cmd_param *param = 358 (struct nci_cmd_param *)opt; 359 360 nci_send_cmd(ndev, param->opcode, param->len, param->payload); 361 } 362 363 int nci_prop_cmd(struct nci_dev *ndev, __u8 oid, size_t len, __u8 *payload) 364 { 365 struct nci_cmd_param param; 366 367 param.opcode = nci_opcode_pack(NCI_GID_PROPRIETARY, oid); 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_prop_cmd); 375 376 int nci_core_cmd(struct nci_dev *ndev, __u16 opcode, size_t len, __u8 *payload) 377 { 378 struct nci_cmd_param param; 379 380 param.opcode = opcode; 381 param.len = len; 382 param.payload = payload; 383 384 return __nci_request(ndev, nci_generic_req, (unsigned long)¶m, 385 msecs_to_jiffies(NCI_CMD_TIMEOUT)); 386 } 387 EXPORT_SYMBOL(nci_core_cmd); 388 389 int nci_core_reset(struct nci_dev *ndev) 390 { 391 return __nci_request(ndev, nci_reset_req, 0, 392 msecs_to_jiffies(NCI_RESET_TIMEOUT)); 393 } 394 EXPORT_SYMBOL(nci_core_reset); 395 396 int nci_core_init(struct nci_dev *ndev) 397 { 398 return __nci_request(ndev, nci_init_req, 0, 399 msecs_to_jiffies(NCI_INIT_TIMEOUT)); 400 } 401 EXPORT_SYMBOL(nci_core_init); 402 403 struct nci_loopback_data { 404 u8 conn_id; 405 struct sk_buff *data; 406 }; 407 408 static void nci_send_data_req(struct nci_dev *ndev, unsigned long opt) 409 { 410 struct nci_loopback_data *data = (struct nci_loopback_data *)opt; 411 412 nci_send_data(ndev, data->conn_id, data->data); 413 } 414 415 static void nci_nfcc_loopback_cb(void *context, struct sk_buff *skb, int err) 416 { 417 struct nci_dev *ndev = (struct nci_dev *)context; 418 struct nci_conn_info *conn_info; 419 420 conn_info = nci_get_conn_info_by_conn_id(ndev, ndev->cur_conn_id); 421 if (!conn_info) { 422 nci_req_complete(ndev, NCI_STATUS_REJECTED); 423 return; 424 } 425 426 conn_info->rx_skb = skb; 427 428 nci_req_complete(ndev, NCI_STATUS_OK); 429 } 430 431 int nci_nfcc_loopback(struct nci_dev *ndev, void *data, size_t data_len, 432 struct sk_buff **resp) 433 { 434 int r; 435 struct nci_loopback_data loopback_data; 436 struct nci_conn_info *conn_info; 437 struct sk_buff *skb; 438 int conn_id = nci_get_conn_info_by_dest_type_params(ndev, 439 NCI_DESTINATION_NFCC_LOOPBACK, NULL); 440 441 if (conn_id < 0) { 442 r = nci_core_conn_create(ndev, NCI_DESTINATION_NFCC_LOOPBACK, 443 0, 0, NULL); 444 if (r != NCI_STATUS_OK) 445 return r; 446 447 conn_id = nci_get_conn_info_by_dest_type_params(ndev, 448 NCI_DESTINATION_NFCC_LOOPBACK, 449 NULL); 450 } 451 452 conn_info = nci_get_conn_info_by_conn_id(ndev, conn_id); 453 if (!conn_info) 454 return -EPROTO; 455 456 /* store cb and context to be used on receiving data */ 457 conn_info->data_exchange_cb = nci_nfcc_loopback_cb; 458 conn_info->data_exchange_cb_context = ndev; 459 460 skb = nci_skb_alloc(ndev, NCI_DATA_HDR_SIZE + data_len, GFP_KERNEL); 461 if (!skb) 462 return -ENOMEM; 463 464 skb_reserve(skb, NCI_DATA_HDR_SIZE); 465 memcpy(skb_put(skb, data_len), data, data_len); 466 467 loopback_data.conn_id = conn_id; 468 loopback_data.data = skb; 469 470 ndev->cur_conn_id = conn_id; 471 r = nci_request(ndev, nci_send_data_req, (unsigned long)&loopback_data, 472 msecs_to_jiffies(NCI_DATA_TIMEOUT)); 473 if (r == NCI_STATUS_OK && resp) 474 *resp = conn_info->rx_skb; 475 476 return r; 477 } 478 EXPORT_SYMBOL(nci_nfcc_loopback); 479 480 static int nci_open_device(struct nci_dev *ndev) 481 { 482 int rc = 0; 483 484 mutex_lock(&ndev->req_lock); 485 486 if (test_bit(NCI_UP, &ndev->flags)) { 487 rc = -EALREADY; 488 goto done; 489 } 490 491 if (ndev->ops->open(ndev)) { 492 rc = -EIO; 493 goto done; 494 } 495 496 atomic_set(&ndev->cmd_cnt, 1); 497 498 set_bit(NCI_INIT, &ndev->flags); 499 500 if (ndev->ops->init) 501 rc = ndev->ops->init(ndev); 502 503 if (!rc) { 504 rc = __nci_request(ndev, nci_reset_req, 0, 505 msecs_to_jiffies(NCI_RESET_TIMEOUT)); 506 } 507 508 if (!rc && ndev->ops->setup) { 509 rc = ndev->ops->setup(ndev); 510 } 511 512 if (!rc) { 513 rc = __nci_request(ndev, nci_init_req, 0, 514 msecs_to_jiffies(NCI_INIT_TIMEOUT)); 515 } 516 517 if (!rc && ndev->ops->post_setup) 518 rc = ndev->ops->post_setup(ndev); 519 520 if (!rc) { 521 rc = __nci_request(ndev, nci_init_complete_req, 0, 522 msecs_to_jiffies(NCI_INIT_TIMEOUT)); 523 } 524 525 clear_bit(NCI_INIT, &ndev->flags); 526 527 if (!rc) { 528 set_bit(NCI_UP, &ndev->flags); 529 nci_clear_target_list(ndev); 530 atomic_set(&ndev->state, NCI_IDLE); 531 } else { 532 /* Init failed, cleanup */ 533 skb_queue_purge(&ndev->cmd_q); 534 skb_queue_purge(&ndev->rx_q); 535 skb_queue_purge(&ndev->tx_q); 536 537 ndev->ops->close(ndev); 538 ndev->flags = 0; 539 } 540 541 done: 542 mutex_unlock(&ndev->req_lock); 543 return rc; 544 } 545 546 static int nci_close_device(struct nci_dev *ndev) 547 { 548 nci_req_cancel(ndev, ENODEV); 549 mutex_lock(&ndev->req_lock); 550 551 if (!test_and_clear_bit(NCI_UP, &ndev->flags)) { 552 del_timer_sync(&ndev->cmd_timer); 553 del_timer_sync(&ndev->data_timer); 554 mutex_unlock(&ndev->req_lock); 555 return 0; 556 } 557 558 /* Drop RX and TX queues */ 559 skb_queue_purge(&ndev->rx_q); 560 skb_queue_purge(&ndev->tx_q); 561 562 /* Flush RX and TX wq */ 563 flush_workqueue(ndev->rx_wq); 564 flush_workqueue(ndev->tx_wq); 565 566 /* Reset device */ 567 skb_queue_purge(&ndev->cmd_q); 568 atomic_set(&ndev->cmd_cnt, 1); 569 570 set_bit(NCI_INIT, &ndev->flags); 571 __nci_request(ndev, nci_reset_req, 0, 572 msecs_to_jiffies(NCI_RESET_TIMEOUT)); 573 574 /* After this point our queues are empty 575 * and no works are scheduled. 576 */ 577 ndev->ops->close(ndev); 578 579 clear_bit(NCI_INIT, &ndev->flags); 580 581 del_timer_sync(&ndev->cmd_timer); 582 583 /* Flush cmd wq */ 584 flush_workqueue(ndev->cmd_wq); 585 586 /* Clear flags */ 587 ndev->flags = 0; 588 589 mutex_unlock(&ndev->req_lock); 590 591 return 0; 592 } 593 594 /* NCI command timer function */ 595 static void nci_cmd_timer(unsigned long arg) 596 { 597 struct nci_dev *ndev = (void *) arg; 598 599 atomic_set(&ndev->cmd_cnt, 1); 600 queue_work(ndev->cmd_wq, &ndev->cmd_work); 601 } 602 603 /* NCI data exchange timer function */ 604 static void nci_data_timer(unsigned long arg) 605 { 606 struct nci_dev *ndev = (void *) arg; 607 608 set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); 609 queue_work(ndev->rx_wq, &ndev->rx_work); 610 } 611 612 static int nci_dev_up(struct nfc_dev *nfc_dev) 613 { 614 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 615 616 return nci_open_device(ndev); 617 } 618 619 static int nci_dev_down(struct nfc_dev *nfc_dev) 620 { 621 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 622 623 return nci_close_device(ndev); 624 } 625 626 int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, __u8 *val) 627 { 628 struct nci_set_config_param param; 629 630 if (!val || !len) 631 return 0; 632 633 param.id = id; 634 param.len = len; 635 param.val = val; 636 637 return __nci_request(ndev, nci_set_config_req, (unsigned long)¶m, 638 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT)); 639 } 640 EXPORT_SYMBOL(nci_set_config); 641 642 static void nci_nfcee_discover_req(struct nci_dev *ndev, unsigned long opt) 643 { 644 struct nci_nfcee_discover_cmd cmd; 645 __u8 action = opt; 646 647 cmd.discovery_action = action; 648 649 nci_send_cmd(ndev, NCI_OP_NFCEE_DISCOVER_CMD, 1, &cmd); 650 } 651 652 int nci_nfcee_discover(struct nci_dev *ndev, u8 action) 653 { 654 return __nci_request(ndev, nci_nfcee_discover_req, action, 655 msecs_to_jiffies(NCI_CMD_TIMEOUT)); 656 } 657 EXPORT_SYMBOL(nci_nfcee_discover); 658 659 static void nci_nfcee_mode_set_req(struct nci_dev *ndev, unsigned long opt) 660 { 661 struct nci_nfcee_mode_set_cmd *cmd = 662 (struct nci_nfcee_mode_set_cmd *)opt; 663 664 nci_send_cmd(ndev, NCI_OP_NFCEE_MODE_SET_CMD, 665 sizeof(struct nci_nfcee_mode_set_cmd), cmd); 666 } 667 668 int nci_nfcee_mode_set(struct nci_dev *ndev, u8 nfcee_id, u8 nfcee_mode) 669 { 670 struct nci_nfcee_mode_set_cmd cmd; 671 672 cmd.nfcee_id = nfcee_id; 673 cmd.nfcee_mode = nfcee_mode; 674 675 return __nci_request(ndev, nci_nfcee_mode_set_req, 676 (unsigned long)&cmd, 677 msecs_to_jiffies(NCI_CMD_TIMEOUT)); 678 } 679 EXPORT_SYMBOL(nci_nfcee_mode_set); 680 681 static void nci_core_conn_create_req(struct nci_dev *ndev, unsigned long opt) 682 { 683 struct core_conn_create_data *data = 684 (struct core_conn_create_data *)opt; 685 686 nci_send_cmd(ndev, NCI_OP_CORE_CONN_CREATE_CMD, data->length, data->cmd); 687 } 688 689 int nci_core_conn_create(struct nci_dev *ndev, u8 destination_type, 690 u8 number_destination_params, 691 size_t params_len, 692 struct core_conn_create_dest_spec_params *params) 693 { 694 int r; 695 struct nci_core_conn_create_cmd *cmd; 696 struct core_conn_create_data data; 697 698 data.length = params_len + sizeof(struct nci_core_conn_create_cmd); 699 cmd = kzalloc(data.length, GFP_KERNEL); 700 if (!cmd) 701 return -ENOMEM; 702 703 cmd->destination_type = destination_type; 704 cmd->number_destination_params = number_destination_params; 705 706 data.cmd = cmd; 707 708 if (params) { 709 memcpy(cmd->params, params, params_len); 710 if (params->length > 0) 711 memcpy(&ndev->cur_params, 712 ¶ms->value[DEST_SPEC_PARAMS_ID_INDEX], 713 sizeof(struct dest_spec_params)); 714 else 715 ndev->cur_params.id = 0; 716 } else { 717 ndev->cur_params.id = 0; 718 } 719 ndev->cur_dest_type = destination_type; 720 721 r = __nci_request(ndev, nci_core_conn_create_req, (unsigned long)&data, 722 msecs_to_jiffies(NCI_CMD_TIMEOUT)); 723 kfree(cmd); 724 return r; 725 } 726 EXPORT_SYMBOL(nci_core_conn_create); 727 728 static void nci_core_conn_close_req(struct nci_dev *ndev, unsigned long opt) 729 { 730 __u8 conn_id = opt; 731 732 nci_send_cmd(ndev, NCI_OP_CORE_CONN_CLOSE_CMD, 1, &conn_id); 733 } 734 735 int nci_core_conn_close(struct nci_dev *ndev, u8 conn_id) 736 { 737 ndev->cur_conn_id = conn_id; 738 return __nci_request(ndev, nci_core_conn_close_req, conn_id, 739 msecs_to_jiffies(NCI_CMD_TIMEOUT)); 740 } 741 EXPORT_SYMBOL(nci_core_conn_close); 742 743 static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev) 744 { 745 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 746 struct nci_set_config_param param; 747 int rc; 748 749 param.val = nfc_get_local_general_bytes(nfc_dev, ¶m.len); 750 if ((param.val == NULL) || (param.len == 0)) 751 return 0; 752 753 if (param.len > NFC_MAX_GT_LEN) 754 return -EINVAL; 755 756 param.id = NCI_PN_ATR_REQ_GEN_BYTES; 757 758 rc = nci_request(ndev, nci_set_config_req, (unsigned long)¶m, 759 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT)); 760 if (rc) 761 return rc; 762 763 param.id = NCI_LN_ATR_RES_GEN_BYTES; 764 765 return nci_request(ndev, nci_set_config_req, (unsigned long)¶m, 766 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT)); 767 } 768 769 static int nci_set_listen_parameters(struct nfc_dev *nfc_dev) 770 { 771 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 772 int rc; 773 __u8 val; 774 775 val = NCI_LA_SEL_INFO_NFC_DEP_MASK; 776 777 rc = nci_set_config(ndev, NCI_LA_SEL_INFO, 1, &val); 778 if (rc) 779 return rc; 780 781 val = NCI_LF_PROTOCOL_TYPE_NFC_DEP_MASK; 782 783 rc = nci_set_config(ndev, NCI_LF_PROTOCOL_TYPE, 1, &val); 784 if (rc) 785 return rc; 786 787 val = NCI_LF_CON_BITR_F_212 | NCI_LF_CON_BITR_F_424; 788 789 return nci_set_config(ndev, NCI_LF_CON_BITR_F, 1, &val); 790 } 791 792 static int nci_start_poll(struct nfc_dev *nfc_dev, 793 __u32 im_protocols, __u32 tm_protocols) 794 { 795 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 796 struct nci_rf_discover_param param; 797 int rc; 798 799 if ((atomic_read(&ndev->state) == NCI_DISCOVERY) || 800 (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) { 801 pr_err("unable to start poll, since poll is already active\n"); 802 return -EBUSY; 803 } 804 805 if (ndev->target_active_prot) { 806 pr_err("there is an active target\n"); 807 return -EBUSY; 808 } 809 810 if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) || 811 (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) { 812 pr_debug("target active or w4 select, implicitly deactivate\n"); 813 814 rc = nci_request(ndev, nci_rf_deactivate_req, 815 NCI_DEACTIVATE_TYPE_IDLE_MODE, 816 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 817 if (rc) 818 return -EBUSY; 819 } 820 821 if ((im_protocols | tm_protocols) & NFC_PROTO_NFC_DEP_MASK) { 822 rc = nci_set_local_general_bytes(nfc_dev); 823 if (rc) { 824 pr_err("failed to set local general bytes\n"); 825 return rc; 826 } 827 } 828 829 if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) { 830 rc = nci_set_listen_parameters(nfc_dev); 831 if (rc) 832 pr_err("failed to set listen parameters\n"); 833 } 834 835 param.im_protocols = im_protocols; 836 param.tm_protocols = tm_protocols; 837 rc = nci_request(ndev, nci_rf_discover_req, (unsigned long)¶m, 838 msecs_to_jiffies(NCI_RF_DISC_TIMEOUT)); 839 840 if (!rc) 841 ndev->poll_prots = im_protocols; 842 843 return rc; 844 } 845 846 static void nci_stop_poll(struct nfc_dev *nfc_dev) 847 { 848 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 849 850 if ((atomic_read(&ndev->state) != NCI_DISCOVERY) && 851 (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) { 852 pr_err("unable to stop poll, since poll is not active\n"); 853 return; 854 } 855 856 nci_request(ndev, nci_rf_deactivate_req, NCI_DEACTIVATE_TYPE_IDLE_MODE, 857 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 858 } 859 860 static int nci_activate_target(struct nfc_dev *nfc_dev, 861 struct nfc_target *target, __u32 protocol) 862 { 863 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 864 struct nci_rf_discover_select_param param; 865 struct nfc_target *nci_target = NULL; 866 int i; 867 int rc = 0; 868 869 pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol); 870 871 if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) && 872 (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) { 873 pr_err("there is no available target to activate\n"); 874 return -EINVAL; 875 } 876 877 if (ndev->target_active_prot) { 878 pr_err("there is already an active target\n"); 879 return -EBUSY; 880 } 881 882 for (i = 0; i < ndev->n_targets; i++) { 883 if (ndev->targets[i].idx == target->idx) { 884 nci_target = &ndev->targets[i]; 885 break; 886 } 887 } 888 889 if (!nci_target) { 890 pr_err("unable to find the selected target\n"); 891 return -EINVAL; 892 } 893 894 if (!(nci_target->supported_protocols & (1 << protocol))) { 895 pr_err("target does not support the requested protocol 0x%x\n", 896 protocol); 897 return -EINVAL; 898 } 899 900 if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) { 901 param.rf_discovery_id = nci_target->logical_idx; 902 903 if (protocol == NFC_PROTO_JEWEL) 904 param.rf_protocol = NCI_RF_PROTOCOL_T1T; 905 else if (protocol == NFC_PROTO_MIFARE) 906 param.rf_protocol = NCI_RF_PROTOCOL_T2T; 907 else if (protocol == NFC_PROTO_FELICA) 908 param.rf_protocol = NCI_RF_PROTOCOL_T3T; 909 else if (protocol == NFC_PROTO_ISO14443 || 910 protocol == NFC_PROTO_ISO14443_B) 911 param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP; 912 else 913 param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP; 914 915 rc = nci_request(ndev, nci_rf_discover_select_req, 916 (unsigned long)¶m, 917 msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT)); 918 } 919 920 if (!rc) 921 ndev->target_active_prot = protocol; 922 923 return rc; 924 } 925 926 static void nci_deactivate_target(struct nfc_dev *nfc_dev, 927 struct nfc_target *target, 928 __u8 mode) 929 { 930 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 931 u8 nci_mode = NCI_DEACTIVATE_TYPE_IDLE_MODE; 932 933 pr_debug("entry\n"); 934 935 if (!ndev->target_active_prot) { 936 pr_err("unable to deactivate target, no active target\n"); 937 return; 938 } 939 940 ndev->target_active_prot = 0; 941 942 switch (mode) { 943 case NFC_TARGET_MODE_SLEEP: 944 nci_mode = NCI_DEACTIVATE_TYPE_SLEEP_MODE; 945 break; 946 } 947 948 if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) { 949 nci_request(ndev, nci_rf_deactivate_req, nci_mode, 950 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 951 } 952 } 953 954 static int nci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target, 955 __u8 comm_mode, __u8 *gb, size_t gb_len) 956 { 957 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 958 int rc; 959 960 pr_debug("target_idx %d, comm_mode %d\n", target->idx, comm_mode); 961 962 rc = nci_activate_target(nfc_dev, target, NFC_PROTO_NFC_DEP); 963 if (rc) 964 return rc; 965 966 rc = nfc_set_remote_general_bytes(nfc_dev, ndev->remote_gb, 967 ndev->remote_gb_len); 968 if (!rc) 969 rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_PASSIVE, 970 NFC_RF_INITIATOR); 971 972 return rc; 973 } 974 975 static int nci_dep_link_down(struct nfc_dev *nfc_dev) 976 { 977 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 978 int rc; 979 980 pr_debug("entry\n"); 981 982 if (nfc_dev->rf_mode == NFC_RF_INITIATOR) { 983 nci_deactivate_target(nfc_dev, NULL, NCI_DEACTIVATE_TYPE_IDLE_MODE); 984 } else { 985 if (atomic_read(&ndev->state) == NCI_LISTEN_ACTIVE || 986 atomic_read(&ndev->state) == NCI_DISCOVERY) { 987 nci_request(ndev, nci_rf_deactivate_req, 0, 988 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 989 } 990 991 rc = nfc_tm_deactivated(nfc_dev); 992 if (rc) 993 pr_err("error when signaling tm deactivation\n"); 994 } 995 996 return 0; 997 } 998 999 1000 static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target, 1001 struct sk_buff *skb, 1002 data_exchange_cb_t cb, void *cb_context) 1003 { 1004 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 1005 int rc; 1006 struct nci_conn_info *conn_info; 1007 1008 conn_info = ndev->rf_conn_info; 1009 if (!conn_info) 1010 return -EPROTO; 1011 1012 pr_debug("target_idx %d, len %d\n", target->idx, skb->len); 1013 1014 if (!ndev->target_active_prot) { 1015 pr_err("unable to exchange data, no active target\n"); 1016 return -EINVAL; 1017 } 1018 1019 if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 1020 return -EBUSY; 1021 1022 /* store cb and context to be used on receiving data */ 1023 conn_info->data_exchange_cb = cb; 1024 conn_info->data_exchange_cb_context = cb_context; 1025 1026 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb); 1027 if (rc) 1028 clear_bit(NCI_DATA_EXCHANGE, &ndev->flags); 1029 1030 return rc; 1031 } 1032 1033 static int nci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb) 1034 { 1035 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 1036 int rc; 1037 1038 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb); 1039 if (rc) 1040 pr_err("unable to send data\n"); 1041 1042 return rc; 1043 } 1044 1045 static int nci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx) 1046 { 1047 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 1048 1049 if (ndev->ops->enable_se) 1050 return ndev->ops->enable_se(ndev, se_idx); 1051 1052 return 0; 1053 } 1054 1055 static int nci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx) 1056 { 1057 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 1058 1059 if (ndev->ops->disable_se) 1060 return ndev->ops->disable_se(ndev, se_idx); 1061 1062 return 0; 1063 } 1064 1065 static int nci_discover_se(struct nfc_dev *nfc_dev) 1066 { 1067 int r; 1068 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 1069 1070 if (ndev->ops->discover_se) { 1071 r = nci_nfcee_discover(ndev, NCI_NFCEE_DISCOVERY_ACTION_ENABLE); 1072 if (r != NCI_STATUS_OK) 1073 return -EPROTO; 1074 1075 return ndev->ops->discover_se(ndev); 1076 } 1077 1078 return 0; 1079 } 1080 1081 static int nci_se_io(struct nfc_dev *nfc_dev, u32 se_idx, 1082 u8 *apdu, size_t apdu_length, 1083 se_io_cb_t cb, void *cb_context) 1084 { 1085 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 1086 1087 if (ndev->ops->se_io) 1088 return ndev->ops->se_io(ndev, se_idx, apdu, 1089 apdu_length, cb, cb_context); 1090 1091 return 0; 1092 } 1093 1094 static int nci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name) 1095 { 1096 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 1097 1098 if (!ndev->ops->fw_download) 1099 return -ENOTSUPP; 1100 1101 return ndev->ops->fw_download(ndev, firmware_name); 1102 } 1103 1104 static struct nfc_ops nci_nfc_ops = { 1105 .dev_up = nci_dev_up, 1106 .dev_down = nci_dev_down, 1107 .start_poll = nci_start_poll, 1108 .stop_poll = nci_stop_poll, 1109 .dep_link_up = nci_dep_link_up, 1110 .dep_link_down = nci_dep_link_down, 1111 .activate_target = nci_activate_target, 1112 .deactivate_target = nci_deactivate_target, 1113 .im_transceive = nci_transceive, 1114 .tm_send = nci_tm_send, 1115 .enable_se = nci_enable_se, 1116 .disable_se = nci_disable_se, 1117 .discover_se = nci_discover_se, 1118 .se_io = nci_se_io, 1119 .fw_download = nci_fw_download, 1120 }; 1121 1122 /* ---- Interface to NCI drivers ---- */ 1123 /** 1124 * nci_allocate_device - allocate a new nci device 1125 * 1126 * @ops: device operations 1127 * @supported_protocols: NFC protocols supported by the device 1128 */ 1129 struct nci_dev *nci_allocate_device(struct nci_ops *ops, 1130 __u32 supported_protocols, 1131 int tx_headroom, int tx_tailroom) 1132 { 1133 struct nci_dev *ndev; 1134 1135 pr_debug("supported_protocols 0x%x\n", supported_protocols); 1136 1137 if (!ops->open || !ops->close || !ops->send) 1138 return NULL; 1139 1140 if (!supported_protocols) 1141 return NULL; 1142 1143 ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL); 1144 if (!ndev) 1145 return NULL; 1146 1147 ndev->ops = ops; 1148 1149 if (ops->n_prop_ops > NCI_MAX_PROPRIETARY_CMD) { 1150 pr_err("Too many proprietary commands: %zd\n", 1151 ops->n_prop_ops); 1152 ops->prop_ops = NULL; 1153 ops->n_prop_ops = 0; 1154 } 1155 1156 ndev->tx_headroom = tx_headroom; 1157 ndev->tx_tailroom = tx_tailroom; 1158 init_completion(&ndev->req_completion); 1159 1160 ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops, 1161 supported_protocols, 1162 tx_headroom + NCI_DATA_HDR_SIZE, 1163 tx_tailroom); 1164 if (!ndev->nfc_dev) 1165 goto free_nci; 1166 1167 ndev->hci_dev = nci_hci_allocate(ndev); 1168 if (!ndev->hci_dev) 1169 goto free_nfc; 1170 1171 nfc_set_drvdata(ndev->nfc_dev, ndev); 1172 1173 return ndev; 1174 1175 free_nfc: 1176 kfree(ndev->nfc_dev); 1177 1178 free_nci: 1179 kfree(ndev); 1180 return NULL; 1181 } 1182 EXPORT_SYMBOL(nci_allocate_device); 1183 1184 /** 1185 * nci_free_device - deallocate nci device 1186 * 1187 * @ndev: The nci device to deallocate 1188 */ 1189 void nci_free_device(struct nci_dev *ndev) 1190 { 1191 nfc_free_device(ndev->nfc_dev); 1192 kfree(ndev); 1193 } 1194 EXPORT_SYMBOL(nci_free_device); 1195 1196 /** 1197 * nci_register_device - register a nci device in the nfc subsystem 1198 * 1199 * @dev: The nci device to register 1200 */ 1201 int nci_register_device(struct nci_dev *ndev) 1202 { 1203 int rc; 1204 struct device *dev = &ndev->nfc_dev->dev; 1205 char name[32]; 1206 1207 ndev->flags = 0; 1208 1209 INIT_WORK(&ndev->cmd_work, nci_cmd_work); 1210 snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev)); 1211 ndev->cmd_wq = create_singlethread_workqueue(name); 1212 if (!ndev->cmd_wq) { 1213 rc = -ENOMEM; 1214 goto exit; 1215 } 1216 1217 INIT_WORK(&ndev->rx_work, nci_rx_work); 1218 snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev)); 1219 ndev->rx_wq = create_singlethread_workqueue(name); 1220 if (!ndev->rx_wq) { 1221 rc = -ENOMEM; 1222 goto destroy_cmd_wq_exit; 1223 } 1224 1225 INIT_WORK(&ndev->tx_work, nci_tx_work); 1226 snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev)); 1227 ndev->tx_wq = create_singlethread_workqueue(name); 1228 if (!ndev->tx_wq) { 1229 rc = -ENOMEM; 1230 goto destroy_rx_wq_exit; 1231 } 1232 1233 skb_queue_head_init(&ndev->cmd_q); 1234 skb_queue_head_init(&ndev->rx_q); 1235 skb_queue_head_init(&ndev->tx_q); 1236 1237 setup_timer(&ndev->cmd_timer, nci_cmd_timer, 1238 (unsigned long) ndev); 1239 setup_timer(&ndev->data_timer, nci_data_timer, 1240 (unsigned long) ndev); 1241 1242 mutex_init(&ndev->req_lock); 1243 INIT_LIST_HEAD(&ndev->conn_info_list); 1244 1245 rc = nfc_register_device(ndev->nfc_dev); 1246 if (rc) 1247 goto destroy_rx_wq_exit; 1248 1249 goto exit; 1250 1251 destroy_rx_wq_exit: 1252 destroy_workqueue(ndev->rx_wq); 1253 1254 destroy_cmd_wq_exit: 1255 destroy_workqueue(ndev->cmd_wq); 1256 1257 exit: 1258 return rc; 1259 } 1260 EXPORT_SYMBOL(nci_register_device); 1261 1262 /** 1263 * nci_unregister_device - unregister a nci device in the nfc subsystem 1264 * 1265 * @dev: The nci device to unregister 1266 */ 1267 void nci_unregister_device(struct nci_dev *ndev) 1268 { 1269 struct nci_conn_info *conn_info, *n; 1270 1271 nci_close_device(ndev); 1272 1273 destroy_workqueue(ndev->cmd_wq); 1274 destroy_workqueue(ndev->rx_wq); 1275 destroy_workqueue(ndev->tx_wq); 1276 1277 list_for_each_entry_safe(conn_info, n, &ndev->conn_info_list, list) { 1278 list_del(&conn_info->list); 1279 /* conn_info is allocated with devm_kzalloc */ 1280 } 1281 1282 nfc_unregister_device(ndev->nfc_dev); 1283 } 1284 EXPORT_SYMBOL(nci_unregister_device); 1285 1286 /** 1287 * nci_recv_frame - receive frame from NCI drivers 1288 * 1289 * @ndev: The nci device 1290 * @skb: The sk_buff to receive 1291 */ 1292 int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb) 1293 { 1294 pr_debug("len %d\n", skb->len); 1295 1296 if (!ndev || (!test_bit(NCI_UP, &ndev->flags) && 1297 !test_bit(NCI_INIT, &ndev->flags))) { 1298 kfree_skb(skb); 1299 return -ENXIO; 1300 } 1301 1302 /* Queue frame for rx worker thread */ 1303 skb_queue_tail(&ndev->rx_q, skb); 1304 queue_work(ndev->rx_wq, &ndev->rx_work); 1305 1306 return 0; 1307 } 1308 EXPORT_SYMBOL(nci_recv_frame); 1309 1310 int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb) 1311 { 1312 pr_debug("len %d\n", skb->len); 1313 1314 if (!ndev) { 1315 kfree_skb(skb); 1316 return -ENODEV; 1317 } 1318 1319 /* Get rid of skb owner, prior to sending to the driver. */ 1320 skb_orphan(skb); 1321 1322 /* Send copy to sniffer */ 1323 nfc_send_to_raw_sock(ndev->nfc_dev, skb, 1324 RAW_PAYLOAD_NCI, NFC_DIRECTION_TX); 1325 1326 return ndev->ops->send(ndev, skb); 1327 } 1328 EXPORT_SYMBOL(nci_send_frame); 1329 1330 /* Send NCI command */ 1331 int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload) 1332 { 1333 struct nci_ctrl_hdr *hdr; 1334 struct sk_buff *skb; 1335 1336 pr_debug("opcode 0x%x, plen %d\n", opcode, plen); 1337 1338 skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL); 1339 if (!skb) { 1340 pr_err("no memory for command\n"); 1341 return -ENOMEM; 1342 } 1343 1344 hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE); 1345 hdr->gid = nci_opcode_gid(opcode); 1346 hdr->oid = nci_opcode_oid(opcode); 1347 hdr->plen = plen; 1348 1349 nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT); 1350 nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST); 1351 1352 if (plen) 1353 memcpy(skb_put(skb, plen), payload, plen); 1354 1355 skb_queue_tail(&ndev->cmd_q, skb); 1356 queue_work(ndev->cmd_wq, &ndev->cmd_work); 1357 1358 return 0; 1359 } 1360 EXPORT_SYMBOL(nci_send_cmd); 1361 1362 /* Proprietary commands API */ 1363 static struct nci_driver_ops *ops_cmd_lookup(struct nci_driver_ops *ops, 1364 size_t n_ops, 1365 __u16 opcode) 1366 { 1367 size_t i; 1368 struct nci_driver_ops *op; 1369 1370 if (!ops || !n_ops) 1371 return NULL; 1372 1373 for (i = 0; i < n_ops; i++) { 1374 op = &ops[i]; 1375 if (op->opcode == opcode) 1376 return op; 1377 } 1378 1379 return NULL; 1380 } 1381 1382 static int nci_op_rsp_packet(struct nci_dev *ndev, __u16 rsp_opcode, 1383 struct sk_buff *skb, struct nci_driver_ops *ops, 1384 size_t n_ops) 1385 { 1386 struct nci_driver_ops *op; 1387 1388 op = ops_cmd_lookup(ops, n_ops, rsp_opcode); 1389 if (!op || !op->rsp) 1390 return -ENOTSUPP; 1391 1392 return op->rsp(ndev, skb); 1393 } 1394 1395 static int nci_op_ntf_packet(struct nci_dev *ndev, __u16 ntf_opcode, 1396 struct sk_buff *skb, struct nci_driver_ops *ops, 1397 size_t n_ops) 1398 { 1399 struct nci_driver_ops *op; 1400 1401 op = ops_cmd_lookup(ops, n_ops, ntf_opcode); 1402 if (!op || !op->ntf) 1403 return -ENOTSUPP; 1404 1405 return op->ntf(ndev, skb); 1406 } 1407 1408 int nci_prop_rsp_packet(struct nci_dev *ndev, __u16 opcode, 1409 struct sk_buff *skb) 1410 { 1411 return nci_op_rsp_packet(ndev, opcode, skb, ndev->ops->prop_ops, 1412 ndev->ops->n_prop_ops); 1413 } 1414 1415 int nci_prop_ntf_packet(struct nci_dev *ndev, __u16 opcode, 1416 struct sk_buff *skb) 1417 { 1418 return nci_op_ntf_packet(ndev, opcode, skb, ndev->ops->prop_ops, 1419 ndev->ops->n_prop_ops); 1420 } 1421 1422 int nci_core_rsp_packet(struct nci_dev *ndev, __u16 opcode, 1423 struct sk_buff *skb) 1424 { 1425 return nci_op_rsp_packet(ndev, opcode, skb, ndev->ops->core_ops, 1426 ndev->ops->n_core_ops); 1427 } 1428 1429 int nci_core_ntf_packet(struct nci_dev *ndev, __u16 opcode, 1430 struct sk_buff *skb) 1431 { 1432 return nci_op_ntf_packet(ndev, opcode, skb, ndev->ops->core_ops, 1433 ndev->ops->n_core_ops); 1434 } 1435 1436 /* ---- NCI TX Data worker thread ---- */ 1437 1438 static void nci_tx_work(struct work_struct *work) 1439 { 1440 struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work); 1441 struct nci_conn_info *conn_info; 1442 struct sk_buff *skb; 1443 1444 conn_info = nci_get_conn_info_by_conn_id(ndev, ndev->cur_conn_id); 1445 if (!conn_info) 1446 return; 1447 1448 pr_debug("credits_cnt %d\n", atomic_read(&conn_info->credits_cnt)); 1449 1450 /* Send queued tx data */ 1451 while (atomic_read(&conn_info->credits_cnt)) { 1452 skb = skb_dequeue(&ndev->tx_q); 1453 if (!skb) 1454 return; 1455 1456 /* Check if data flow control is used */ 1457 if (atomic_read(&conn_info->credits_cnt) != 1458 NCI_DATA_FLOW_CONTROL_NOT_USED) 1459 atomic_dec(&conn_info->credits_cnt); 1460 1461 pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n", 1462 nci_pbf(skb->data), 1463 nci_conn_id(skb->data), 1464 nci_plen(skb->data)); 1465 1466 nci_send_frame(ndev, skb); 1467 1468 mod_timer(&ndev->data_timer, 1469 jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT)); 1470 } 1471 } 1472 1473 /* ----- NCI RX worker thread (data & control) ----- */ 1474 1475 static void nci_rx_work(struct work_struct *work) 1476 { 1477 struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work); 1478 struct sk_buff *skb; 1479 1480 while ((skb = skb_dequeue(&ndev->rx_q))) { 1481 1482 /* Send copy to sniffer */ 1483 nfc_send_to_raw_sock(ndev->nfc_dev, skb, 1484 RAW_PAYLOAD_NCI, NFC_DIRECTION_RX); 1485 1486 /* Process frame */ 1487 switch (nci_mt(skb->data)) { 1488 case NCI_MT_RSP_PKT: 1489 nci_rsp_packet(ndev, skb); 1490 break; 1491 1492 case NCI_MT_NTF_PKT: 1493 nci_ntf_packet(ndev, skb); 1494 break; 1495 1496 case NCI_MT_DATA_PKT: 1497 nci_rx_data_packet(ndev, skb); 1498 break; 1499 1500 default: 1501 pr_err("unknown MT 0x%x\n", nci_mt(skb->data)); 1502 kfree_skb(skb); 1503 break; 1504 } 1505 } 1506 1507 /* check if a data exchange timout has occurred */ 1508 if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) { 1509 /* complete the data exchange transaction, if exists */ 1510 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 1511 nci_data_exchange_complete(ndev, NULL, 1512 ndev->cur_conn_id, 1513 -ETIMEDOUT); 1514 1515 clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); 1516 } 1517 } 1518 1519 /* ----- NCI TX CMD worker thread ----- */ 1520 1521 static void nci_cmd_work(struct work_struct *work) 1522 { 1523 struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work); 1524 struct sk_buff *skb; 1525 1526 pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt)); 1527 1528 /* Send queued command */ 1529 if (atomic_read(&ndev->cmd_cnt)) { 1530 skb = skb_dequeue(&ndev->cmd_q); 1531 if (!skb) 1532 return; 1533 1534 atomic_dec(&ndev->cmd_cnt); 1535 1536 pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n", 1537 nci_pbf(skb->data), 1538 nci_opcode_gid(nci_opcode(skb->data)), 1539 nci_opcode_oid(nci_opcode(skb->data)), 1540 nci_plen(skb->data)); 1541 1542 nci_send_frame(ndev, skb); 1543 1544 mod_timer(&ndev->cmd_timer, 1545 jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT)); 1546 } 1547 } 1548 1549 MODULE_LICENSE("GPL"); 1550