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