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 * 7 * Written by Ilan Elias <ilane@ti.com> 8 * 9 * Acknowledgements: 10 * This file is based on hci_core.c, which was written 11 * by Maxim Krasnyansky. 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License version 2 15 * as published by the Free Software Foundation 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 25 * 26 */ 27 28 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ 29 30 #include <linux/module.h> 31 #include <linux/types.h> 32 #include <linux/workqueue.h> 33 #include <linux/completion.h> 34 #include <linux/export.h> 35 #include <linux/sched.h> 36 #include <linux/bitops.h> 37 #include <linux/skbuff.h> 38 39 #include "../nfc.h" 40 #include <net/nfc/nci.h> 41 #include <net/nfc/nci_core.h> 42 #include <linux/nfc.h> 43 44 static void nci_cmd_work(struct work_struct *work); 45 static void nci_rx_work(struct work_struct *work); 46 static void nci_tx_work(struct work_struct *work); 47 48 /* ---- NCI requests ---- */ 49 50 void nci_req_complete(struct nci_dev *ndev, int result) 51 { 52 if (ndev->req_status == NCI_REQ_PEND) { 53 ndev->req_result = result; 54 ndev->req_status = NCI_REQ_DONE; 55 complete(&ndev->req_completion); 56 } 57 } 58 59 static void nci_req_cancel(struct nci_dev *ndev, int err) 60 { 61 if (ndev->req_status == NCI_REQ_PEND) { 62 ndev->req_result = err; 63 ndev->req_status = NCI_REQ_CANCELED; 64 complete(&ndev->req_completion); 65 } 66 } 67 68 /* Execute request and wait for completion. */ 69 static int __nci_request(struct nci_dev *ndev, 70 void (*req)(struct nci_dev *ndev, unsigned long opt), 71 unsigned long opt, __u32 timeout) 72 { 73 int rc = 0; 74 long completion_rc; 75 76 ndev->req_status = NCI_REQ_PEND; 77 78 init_completion(&ndev->req_completion); 79 req(ndev, opt); 80 completion_rc = 81 wait_for_completion_interruptible_timeout(&ndev->req_completion, 82 timeout); 83 84 pr_debug("wait_for_completion return %ld\n", completion_rc); 85 86 if (completion_rc > 0) { 87 switch (ndev->req_status) { 88 case NCI_REQ_DONE: 89 rc = nci_to_errno(ndev->req_result); 90 break; 91 92 case NCI_REQ_CANCELED: 93 rc = -ndev->req_result; 94 break; 95 96 default: 97 rc = -ETIMEDOUT; 98 break; 99 } 100 } else { 101 pr_err("wait_for_completion_interruptible_timeout failed %ld\n", 102 completion_rc); 103 104 rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc)); 105 } 106 107 ndev->req_status = ndev->req_result = 0; 108 109 return rc; 110 } 111 112 static inline int nci_request(struct nci_dev *ndev, 113 void (*req)(struct nci_dev *ndev, 114 unsigned long opt), 115 unsigned long opt, __u32 timeout) 116 { 117 int rc; 118 119 if (!test_bit(NCI_UP, &ndev->flags)) 120 return -ENETDOWN; 121 122 /* Serialize all requests */ 123 mutex_lock(&ndev->req_lock); 124 rc = __nci_request(ndev, req, opt, timeout); 125 mutex_unlock(&ndev->req_lock); 126 127 return rc; 128 } 129 130 static void nci_reset_req(struct nci_dev *ndev, unsigned long opt) 131 { 132 struct nci_core_reset_cmd cmd; 133 134 cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG; 135 nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd); 136 } 137 138 static void nci_init_req(struct nci_dev *ndev, unsigned long opt) 139 { 140 nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL); 141 } 142 143 static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt) 144 { 145 struct nci_rf_disc_map_cmd cmd; 146 struct disc_map_config *cfg = cmd.mapping_configs; 147 __u8 *num = &cmd.num_mapping_configs; 148 int i; 149 150 /* set rf mapping configurations */ 151 *num = 0; 152 153 /* by default mapping is set to NCI_RF_INTERFACE_FRAME */ 154 for (i = 0; i < ndev->num_supported_rf_interfaces; i++) { 155 if (ndev->supported_rf_interfaces[i] == 156 NCI_RF_INTERFACE_ISO_DEP) { 157 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP; 158 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL | 159 NCI_DISC_MAP_MODE_LISTEN; 160 cfg[*num].rf_interface = NCI_RF_INTERFACE_ISO_DEP; 161 (*num)++; 162 } else if (ndev->supported_rf_interfaces[i] == 163 NCI_RF_INTERFACE_NFC_DEP) { 164 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP; 165 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL | 166 NCI_DISC_MAP_MODE_LISTEN; 167 cfg[*num].rf_interface = NCI_RF_INTERFACE_NFC_DEP; 168 (*num)++; 169 } 170 171 if (*num == NCI_MAX_NUM_MAPPING_CONFIGS) 172 break; 173 } 174 175 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD, 176 (1 + ((*num) * sizeof(struct disc_map_config))), &cmd); 177 } 178 179 struct nci_set_config_param { 180 __u8 id; 181 size_t len; 182 __u8 *val; 183 }; 184 185 static void nci_set_config_req(struct nci_dev *ndev, unsigned long opt) 186 { 187 struct nci_set_config_param *param = (struct nci_set_config_param *)opt; 188 struct nci_core_set_config_cmd cmd; 189 190 BUG_ON(param->len > NCI_MAX_PARAM_LEN); 191 192 cmd.num_params = 1; 193 cmd.param.id = param->id; 194 cmd.param.len = param->len; 195 memcpy(cmd.param.val, param->val, param->len); 196 197 nci_send_cmd(ndev, NCI_OP_CORE_SET_CONFIG_CMD, (3 + param->len), &cmd); 198 } 199 200 static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt) 201 { 202 struct nci_rf_disc_cmd cmd; 203 __u32 protocols = opt; 204 205 cmd.num_disc_configs = 0; 206 207 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 208 (protocols & NFC_PROTO_JEWEL_MASK || 209 protocols & NFC_PROTO_MIFARE_MASK || 210 protocols & NFC_PROTO_ISO14443_MASK || 211 protocols & NFC_PROTO_NFC_DEP_MASK)) { 212 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 213 NCI_NFC_A_PASSIVE_POLL_MODE; 214 cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 215 cmd.num_disc_configs++; 216 } 217 218 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 219 (protocols & NFC_PROTO_ISO14443_B_MASK)) { 220 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 221 NCI_NFC_B_PASSIVE_POLL_MODE; 222 cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 223 cmd.num_disc_configs++; 224 } 225 226 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && 227 (protocols & NFC_PROTO_FELICA_MASK || 228 protocols & NFC_PROTO_NFC_DEP_MASK)) { 229 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = 230 NCI_NFC_F_PASSIVE_POLL_MODE; 231 cmd.disc_configs[cmd.num_disc_configs].frequency = 1; 232 cmd.num_disc_configs++; 233 } 234 235 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD, 236 (1 + (cmd.num_disc_configs * sizeof(struct disc_config))), 237 &cmd); 238 } 239 240 struct nci_rf_discover_select_param { 241 __u8 rf_discovery_id; 242 __u8 rf_protocol; 243 }; 244 245 static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt) 246 { 247 struct nci_rf_discover_select_param *param = 248 (struct nci_rf_discover_select_param *)opt; 249 struct nci_rf_discover_select_cmd cmd; 250 251 cmd.rf_discovery_id = param->rf_discovery_id; 252 cmd.rf_protocol = param->rf_protocol; 253 254 switch (cmd.rf_protocol) { 255 case NCI_RF_PROTOCOL_ISO_DEP: 256 cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP; 257 break; 258 259 case NCI_RF_PROTOCOL_NFC_DEP: 260 cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP; 261 break; 262 263 default: 264 cmd.rf_interface = NCI_RF_INTERFACE_FRAME; 265 break; 266 } 267 268 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD, 269 sizeof(struct nci_rf_discover_select_cmd), &cmd); 270 } 271 272 static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt) 273 { 274 struct nci_rf_deactivate_cmd cmd; 275 276 cmd.type = NCI_DEACTIVATE_TYPE_IDLE_MODE; 277 278 nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD, 279 sizeof(struct nci_rf_deactivate_cmd), &cmd); 280 } 281 282 static int nci_open_device(struct nci_dev *ndev) 283 { 284 int rc = 0; 285 286 mutex_lock(&ndev->req_lock); 287 288 if (test_bit(NCI_UP, &ndev->flags)) { 289 rc = -EALREADY; 290 goto done; 291 } 292 293 if (ndev->ops->open(ndev)) { 294 rc = -EIO; 295 goto done; 296 } 297 298 atomic_set(&ndev->cmd_cnt, 1); 299 300 set_bit(NCI_INIT, &ndev->flags); 301 302 rc = __nci_request(ndev, nci_reset_req, 0, 303 msecs_to_jiffies(NCI_RESET_TIMEOUT)); 304 305 if (!rc) { 306 rc = __nci_request(ndev, nci_init_req, 0, 307 msecs_to_jiffies(NCI_INIT_TIMEOUT)); 308 } 309 310 if (!rc) { 311 rc = __nci_request(ndev, nci_init_complete_req, 0, 312 msecs_to_jiffies(NCI_INIT_TIMEOUT)); 313 } 314 315 clear_bit(NCI_INIT, &ndev->flags); 316 317 if (!rc) { 318 set_bit(NCI_UP, &ndev->flags); 319 nci_clear_target_list(ndev); 320 atomic_set(&ndev->state, NCI_IDLE); 321 } else { 322 /* Init failed, cleanup */ 323 skb_queue_purge(&ndev->cmd_q); 324 skb_queue_purge(&ndev->rx_q); 325 skb_queue_purge(&ndev->tx_q); 326 327 ndev->ops->close(ndev); 328 ndev->flags = 0; 329 } 330 331 done: 332 mutex_unlock(&ndev->req_lock); 333 return rc; 334 } 335 336 static int nci_close_device(struct nci_dev *ndev) 337 { 338 nci_req_cancel(ndev, ENODEV); 339 mutex_lock(&ndev->req_lock); 340 341 if (!test_and_clear_bit(NCI_UP, &ndev->flags)) { 342 del_timer_sync(&ndev->cmd_timer); 343 del_timer_sync(&ndev->data_timer); 344 mutex_unlock(&ndev->req_lock); 345 return 0; 346 } 347 348 /* Drop RX and TX queues */ 349 skb_queue_purge(&ndev->rx_q); 350 skb_queue_purge(&ndev->tx_q); 351 352 /* Flush RX and TX wq */ 353 flush_workqueue(ndev->rx_wq); 354 flush_workqueue(ndev->tx_wq); 355 356 /* Reset device */ 357 skb_queue_purge(&ndev->cmd_q); 358 atomic_set(&ndev->cmd_cnt, 1); 359 360 set_bit(NCI_INIT, &ndev->flags); 361 __nci_request(ndev, nci_reset_req, 0, 362 msecs_to_jiffies(NCI_RESET_TIMEOUT)); 363 clear_bit(NCI_INIT, &ndev->flags); 364 365 /* Flush cmd wq */ 366 flush_workqueue(ndev->cmd_wq); 367 368 /* After this point our queues are empty 369 * and no works are scheduled. */ 370 ndev->ops->close(ndev); 371 372 /* Clear flags */ 373 ndev->flags = 0; 374 375 mutex_unlock(&ndev->req_lock); 376 377 return 0; 378 } 379 380 /* NCI command timer function */ 381 static void nci_cmd_timer(unsigned long arg) 382 { 383 struct nci_dev *ndev = (void *) arg; 384 385 atomic_set(&ndev->cmd_cnt, 1); 386 queue_work(ndev->cmd_wq, &ndev->cmd_work); 387 } 388 389 /* NCI data exchange timer function */ 390 static void nci_data_timer(unsigned long arg) 391 { 392 struct nci_dev *ndev = (void *) arg; 393 394 set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); 395 queue_work(ndev->rx_wq, &ndev->rx_work); 396 } 397 398 static int nci_dev_up(struct nfc_dev *nfc_dev) 399 { 400 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 401 402 return nci_open_device(ndev); 403 } 404 405 static int nci_dev_down(struct nfc_dev *nfc_dev) 406 { 407 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 408 409 return nci_close_device(ndev); 410 } 411 412 static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev) 413 { 414 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 415 struct nci_set_config_param param; 416 __u8 local_gb[NFC_MAX_GT_LEN]; 417 int i; 418 419 param.val = nfc_get_local_general_bytes(nfc_dev, ¶m.len); 420 if ((param.val == NULL) || (param.len == 0)) 421 return 0; 422 423 if (param.len > NFC_MAX_GT_LEN) 424 return -EINVAL; 425 426 for (i = 0; i < param.len; i++) 427 local_gb[param.len-1-i] = param.val[i]; 428 429 param.id = NCI_PN_ATR_REQ_GEN_BYTES; 430 param.val = local_gb; 431 432 return nci_request(ndev, nci_set_config_req, (unsigned long)¶m, 433 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT)); 434 } 435 436 static int nci_start_poll(struct nfc_dev *nfc_dev, 437 __u32 im_protocols, __u32 tm_protocols) 438 { 439 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 440 int rc; 441 442 if ((atomic_read(&ndev->state) == NCI_DISCOVERY) || 443 (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) { 444 pr_err("unable to start poll, since poll is already active\n"); 445 return -EBUSY; 446 } 447 448 if (ndev->target_active_prot) { 449 pr_err("there is an active target\n"); 450 return -EBUSY; 451 } 452 453 if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) || 454 (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) { 455 pr_debug("target active or w4 select, implicitly deactivate\n"); 456 457 rc = nci_request(ndev, nci_rf_deactivate_req, 0, 458 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 459 if (rc) 460 return -EBUSY; 461 } 462 463 if (im_protocols & NFC_PROTO_NFC_DEP_MASK) { 464 rc = nci_set_local_general_bytes(nfc_dev); 465 if (rc) { 466 pr_err("failed to set local general bytes\n"); 467 return rc; 468 } 469 } 470 471 rc = nci_request(ndev, nci_rf_discover_req, im_protocols, 472 msecs_to_jiffies(NCI_RF_DISC_TIMEOUT)); 473 474 if (!rc) 475 ndev->poll_prots = im_protocols; 476 477 return rc; 478 } 479 480 static void nci_stop_poll(struct nfc_dev *nfc_dev) 481 { 482 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 483 484 if ((atomic_read(&ndev->state) != NCI_DISCOVERY) && 485 (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) { 486 pr_err("unable to stop poll, since poll is not active\n"); 487 return; 488 } 489 490 nci_request(ndev, nci_rf_deactivate_req, 0, 491 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 492 } 493 494 static int nci_activate_target(struct nfc_dev *nfc_dev, 495 struct nfc_target *target, __u32 protocol) 496 { 497 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 498 struct nci_rf_discover_select_param param; 499 struct nfc_target *nci_target = NULL; 500 int i; 501 int rc = 0; 502 503 pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol); 504 505 if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) && 506 (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) { 507 pr_err("there is no available target to activate\n"); 508 return -EINVAL; 509 } 510 511 if (ndev->target_active_prot) { 512 pr_err("there is already an active target\n"); 513 return -EBUSY; 514 } 515 516 for (i = 0; i < ndev->n_targets; i++) { 517 if (ndev->targets[i].idx == target->idx) { 518 nci_target = &ndev->targets[i]; 519 break; 520 } 521 } 522 523 if (!nci_target) { 524 pr_err("unable to find the selected target\n"); 525 return -EINVAL; 526 } 527 528 if (!(nci_target->supported_protocols & (1 << protocol))) { 529 pr_err("target does not support the requested protocol 0x%x\n", 530 protocol); 531 return -EINVAL; 532 } 533 534 if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) { 535 param.rf_discovery_id = nci_target->logical_idx; 536 537 if (protocol == NFC_PROTO_JEWEL) 538 param.rf_protocol = NCI_RF_PROTOCOL_T1T; 539 else if (protocol == NFC_PROTO_MIFARE) 540 param.rf_protocol = NCI_RF_PROTOCOL_T2T; 541 else if (protocol == NFC_PROTO_FELICA) 542 param.rf_protocol = NCI_RF_PROTOCOL_T3T; 543 else if (protocol == NFC_PROTO_ISO14443 || 544 protocol == NFC_PROTO_ISO14443_B) 545 param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP; 546 else 547 param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP; 548 549 rc = nci_request(ndev, nci_rf_discover_select_req, 550 (unsigned long)¶m, 551 msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT)); 552 } 553 554 if (!rc) 555 ndev->target_active_prot = protocol; 556 557 return rc; 558 } 559 560 static void nci_deactivate_target(struct nfc_dev *nfc_dev, 561 struct nfc_target *target) 562 { 563 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 564 565 pr_debug("entry\n"); 566 567 if (!ndev->target_active_prot) { 568 pr_err("unable to deactivate target, no active target\n"); 569 return; 570 } 571 572 ndev->target_active_prot = 0; 573 574 if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) { 575 nci_request(ndev, nci_rf_deactivate_req, 0, 576 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); 577 } 578 } 579 580 static int nci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target, 581 __u8 comm_mode, __u8 *gb, size_t gb_len) 582 { 583 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 584 int rc; 585 586 pr_debug("target_idx %d, comm_mode %d\n", target->idx, comm_mode); 587 588 rc = nci_activate_target(nfc_dev, target, NFC_PROTO_NFC_DEP); 589 if (rc) 590 return rc; 591 592 rc = nfc_set_remote_general_bytes(nfc_dev, ndev->remote_gb, 593 ndev->remote_gb_len); 594 if (!rc) 595 rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_PASSIVE, 596 NFC_RF_INITIATOR); 597 598 return rc; 599 } 600 601 static int nci_dep_link_down(struct nfc_dev *nfc_dev) 602 { 603 pr_debug("entry\n"); 604 605 nci_deactivate_target(nfc_dev, NULL); 606 607 return 0; 608 } 609 610 611 static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target, 612 struct sk_buff *skb, 613 data_exchange_cb_t cb, void *cb_context) 614 { 615 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); 616 int rc; 617 618 pr_debug("target_idx %d, len %d\n", target->idx, skb->len); 619 620 if (!ndev->target_active_prot) { 621 pr_err("unable to exchange data, no active target\n"); 622 return -EINVAL; 623 } 624 625 if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 626 return -EBUSY; 627 628 /* store cb and context to be used on receiving data */ 629 ndev->data_exchange_cb = cb; 630 ndev->data_exchange_cb_context = cb_context; 631 632 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb); 633 if (rc) 634 clear_bit(NCI_DATA_EXCHANGE, &ndev->flags); 635 636 return rc; 637 } 638 639 static int nci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx) 640 { 641 return 0; 642 } 643 644 static int nci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx) 645 { 646 return 0; 647 } 648 649 static int nci_discover_se(struct nfc_dev *nfc_dev) 650 { 651 return 0; 652 } 653 654 static struct nfc_ops nci_nfc_ops = { 655 .dev_up = nci_dev_up, 656 .dev_down = nci_dev_down, 657 .start_poll = nci_start_poll, 658 .stop_poll = nci_stop_poll, 659 .dep_link_up = nci_dep_link_up, 660 .dep_link_down = nci_dep_link_down, 661 .activate_target = nci_activate_target, 662 .deactivate_target = nci_deactivate_target, 663 .im_transceive = nci_transceive, 664 .enable_se = nci_enable_se, 665 .disable_se = nci_disable_se, 666 .discover_se = nci_discover_se, 667 }; 668 669 /* ---- Interface to NCI drivers ---- */ 670 671 /** 672 * nci_allocate_device - allocate a new nci device 673 * 674 * @ops: device operations 675 * @supported_protocols: NFC protocols supported by the device 676 */ 677 struct nci_dev *nci_allocate_device(struct nci_ops *ops, 678 __u32 supported_protocols, 679 int tx_headroom, int tx_tailroom) 680 { 681 struct nci_dev *ndev; 682 683 pr_debug("supported_protocols 0x%x\n", supported_protocols); 684 685 if (!ops->open || !ops->close || !ops->send) 686 return NULL; 687 688 if (!supported_protocols) 689 return NULL; 690 691 ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL); 692 if (!ndev) 693 return NULL; 694 695 ndev->ops = ops; 696 ndev->tx_headroom = tx_headroom; 697 ndev->tx_tailroom = tx_tailroom; 698 699 ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops, 700 supported_protocols, 701 tx_headroom + NCI_DATA_HDR_SIZE, 702 tx_tailroom); 703 if (!ndev->nfc_dev) 704 goto free_exit; 705 706 nfc_set_drvdata(ndev->nfc_dev, ndev); 707 708 return ndev; 709 710 free_exit: 711 kfree(ndev); 712 return NULL; 713 } 714 EXPORT_SYMBOL(nci_allocate_device); 715 716 /** 717 * nci_free_device - deallocate nci device 718 * 719 * @ndev: The nci device to deallocate 720 */ 721 void nci_free_device(struct nci_dev *ndev) 722 { 723 nfc_free_device(ndev->nfc_dev); 724 kfree(ndev); 725 } 726 EXPORT_SYMBOL(nci_free_device); 727 728 /** 729 * nci_register_device - register a nci device in the nfc subsystem 730 * 731 * @dev: The nci device to register 732 */ 733 int nci_register_device(struct nci_dev *ndev) 734 { 735 int rc; 736 struct device *dev = &ndev->nfc_dev->dev; 737 char name[32]; 738 739 rc = nfc_register_device(ndev->nfc_dev); 740 if (rc) 741 goto exit; 742 743 ndev->flags = 0; 744 745 INIT_WORK(&ndev->cmd_work, nci_cmd_work); 746 snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev)); 747 ndev->cmd_wq = create_singlethread_workqueue(name); 748 if (!ndev->cmd_wq) { 749 rc = -ENOMEM; 750 goto unreg_exit; 751 } 752 753 INIT_WORK(&ndev->rx_work, nci_rx_work); 754 snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev)); 755 ndev->rx_wq = create_singlethread_workqueue(name); 756 if (!ndev->rx_wq) { 757 rc = -ENOMEM; 758 goto destroy_cmd_wq_exit; 759 } 760 761 INIT_WORK(&ndev->tx_work, nci_tx_work); 762 snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev)); 763 ndev->tx_wq = create_singlethread_workqueue(name); 764 if (!ndev->tx_wq) { 765 rc = -ENOMEM; 766 goto destroy_rx_wq_exit; 767 } 768 769 skb_queue_head_init(&ndev->cmd_q); 770 skb_queue_head_init(&ndev->rx_q); 771 skb_queue_head_init(&ndev->tx_q); 772 773 setup_timer(&ndev->cmd_timer, nci_cmd_timer, 774 (unsigned long) ndev); 775 setup_timer(&ndev->data_timer, nci_data_timer, 776 (unsigned long) ndev); 777 778 mutex_init(&ndev->req_lock); 779 780 goto exit; 781 782 destroy_rx_wq_exit: 783 destroy_workqueue(ndev->rx_wq); 784 785 destroy_cmd_wq_exit: 786 destroy_workqueue(ndev->cmd_wq); 787 788 unreg_exit: 789 nfc_unregister_device(ndev->nfc_dev); 790 791 exit: 792 return rc; 793 } 794 EXPORT_SYMBOL(nci_register_device); 795 796 /** 797 * nci_unregister_device - unregister a nci device in the nfc subsystem 798 * 799 * @dev: The nci device to unregister 800 */ 801 void nci_unregister_device(struct nci_dev *ndev) 802 { 803 nci_close_device(ndev); 804 805 destroy_workqueue(ndev->cmd_wq); 806 destroy_workqueue(ndev->rx_wq); 807 destroy_workqueue(ndev->tx_wq); 808 809 nfc_unregister_device(ndev->nfc_dev); 810 } 811 EXPORT_SYMBOL(nci_unregister_device); 812 813 /** 814 * nci_recv_frame - receive frame from NCI drivers 815 * 816 * @ndev: The nci device 817 * @skb: The sk_buff to receive 818 */ 819 int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb) 820 { 821 pr_debug("len %d\n", skb->len); 822 823 if (!ndev || (!test_bit(NCI_UP, &ndev->flags) && 824 !test_bit(NCI_INIT, &ndev->flags))) { 825 kfree_skb(skb); 826 return -ENXIO; 827 } 828 829 /* Queue frame for rx worker thread */ 830 skb_queue_tail(&ndev->rx_q, skb); 831 queue_work(ndev->rx_wq, &ndev->rx_work); 832 833 return 0; 834 } 835 EXPORT_SYMBOL(nci_recv_frame); 836 837 static int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb) 838 { 839 pr_debug("len %d\n", skb->len); 840 841 if (!ndev) { 842 kfree_skb(skb); 843 return -ENODEV; 844 } 845 846 /* Get rid of skb owner, prior to sending to the driver. */ 847 skb_orphan(skb); 848 849 return ndev->ops->send(ndev, skb); 850 } 851 852 /* Send NCI command */ 853 int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload) 854 { 855 struct nci_ctrl_hdr *hdr; 856 struct sk_buff *skb; 857 858 pr_debug("opcode 0x%x, plen %d\n", opcode, plen); 859 860 skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL); 861 if (!skb) { 862 pr_err("no memory for command\n"); 863 return -ENOMEM; 864 } 865 866 hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE); 867 hdr->gid = nci_opcode_gid(opcode); 868 hdr->oid = nci_opcode_oid(opcode); 869 hdr->plen = plen; 870 871 nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT); 872 nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST); 873 874 if (plen) 875 memcpy(skb_put(skb, plen), payload, plen); 876 877 skb_queue_tail(&ndev->cmd_q, skb); 878 queue_work(ndev->cmd_wq, &ndev->cmd_work); 879 880 return 0; 881 } 882 883 /* ---- NCI TX Data worker thread ---- */ 884 885 static void nci_tx_work(struct work_struct *work) 886 { 887 struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work); 888 struct sk_buff *skb; 889 890 pr_debug("credits_cnt %d\n", atomic_read(&ndev->credits_cnt)); 891 892 /* Send queued tx data */ 893 while (atomic_read(&ndev->credits_cnt)) { 894 skb = skb_dequeue(&ndev->tx_q); 895 if (!skb) 896 return; 897 898 /* Check if data flow control is used */ 899 if (atomic_read(&ndev->credits_cnt) != 900 NCI_DATA_FLOW_CONTROL_NOT_USED) 901 atomic_dec(&ndev->credits_cnt); 902 903 pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n", 904 nci_pbf(skb->data), 905 nci_conn_id(skb->data), 906 nci_plen(skb->data)); 907 908 nci_send_frame(ndev, skb); 909 910 mod_timer(&ndev->data_timer, 911 jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT)); 912 } 913 } 914 915 /* ----- NCI RX worker thread (data & control) ----- */ 916 917 static void nci_rx_work(struct work_struct *work) 918 { 919 struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work); 920 struct sk_buff *skb; 921 922 while ((skb = skb_dequeue(&ndev->rx_q))) { 923 /* Process frame */ 924 switch (nci_mt(skb->data)) { 925 case NCI_MT_RSP_PKT: 926 nci_rsp_packet(ndev, skb); 927 break; 928 929 case NCI_MT_NTF_PKT: 930 nci_ntf_packet(ndev, skb); 931 break; 932 933 case NCI_MT_DATA_PKT: 934 nci_rx_data_packet(ndev, skb); 935 break; 936 937 default: 938 pr_err("unknown MT 0x%x\n", nci_mt(skb->data)); 939 kfree_skb(skb); 940 break; 941 } 942 } 943 944 /* check if a data exchange timout has occurred */ 945 if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) { 946 /* complete the data exchange transaction, if exists */ 947 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags)) 948 nci_data_exchange_complete(ndev, NULL, -ETIMEDOUT); 949 950 clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); 951 } 952 } 953 954 /* ----- NCI TX CMD worker thread ----- */ 955 956 static void nci_cmd_work(struct work_struct *work) 957 { 958 struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work); 959 struct sk_buff *skb; 960 961 pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt)); 962 963 /* Send queued command */ 964 if (atomic_read(&ndev->cmd_cnt)) { 965 skb = skb_dequeue(&ndev->cmd_q); 966 if (!skb) 967 return; 968 969 atomic_dec(&ndev->cmd_cnt); 970 971 pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n", 972 nci_pbf(skb->data), 973 nci_opcode_gid(nci_opcode(skb->data)), 974 nci_opcode_oid(nci_opcode(skb->data)), 975 nci_plen(skb->data)); 976 977 nci_send_frame(ndev, skb); 978 979 mod_timer(&ndev->cmd_timer, 980 jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT)); 981 } 982 } 983 984 MODULE_LICENSE("GPL"); 985