1 /* 2 * Copyright (C) 2012 Intel Corporation. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #define pr_fmt(fmt) "hci: %s: " fmt, __func__ 19 20 #include <linux/init.h> 21 #include <linux/kernel.h> 22 #include <linux/module.h> 23 #include <linux/nfc.h> 24 25 #include <net/nfc/nfc.h> 26 #include <net/nfc/hci.h> 27 #include <net/nfc/llc.h> 28 29 #include "hci.h" 30 31 /* Largest headroom needed for outgoing HCI commands */ 32 #define HCI_CMDS_HEADROOM 1 33 34 int nfc_hci_result_to_errno(u8 result) 35 { 36 switch (result) { 37 case NFC_HCI_ANY_OK: 38 return 0; 39 case NFC_HCI_ANY_E_REG_PAR_UNKNOWN: 40 return -EOPNOTSUPP; 41 case NFC_HCI_ANY_E_TIMEOUT: 42 return -ETIME; 43 default: 44 return -1; 45 } 46 } 47 EXPORT_SYMBOL(nfc_hci_result_to_errno); 48 49 static void nfc_hci_msg_tx_work(struct work_struct *work) 50 { 51 struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev, 52 msg_tx_work); 53 struct hci_msg *msg; 54 struct sk_buff *skb; 55 int r = 0; 56 57 mutex_lock(&hdev->msg_tx_mutex); 58 if (hdev->shutting_down) 59 goto exit; 60 61 if (hdev->cmd_pending_msg) { 62 if (timer_pending(&hdev->cmd_timer) == 0) { 63 if (hdev->cmd_pending_msg->cb) 64 hdev->cmd_pending_msg->cb(hdev-> 65 cmd_pending_msg-> 66 cb_context, 67 NULL, 68 -ETIME); 69 kfree(hdev->cmd_pending_msg); 70 hdev->cmd_pending_msg = NULL; 71 } else { 72 goto exit; 73 } 74 } 75 76 next_msg: 77 if (list_empty(&hdev->msg_tx_queue)) 78 goto exit; 79 80 msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l); 81 list_del(&msg->msg_l); 82 83 pr_debug("msg_tx_queue has a cmd to send\n"); 84 while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) { 85 r = nfc_llc_xmit_from_hci(hdev->llc, skb); 86 if (r < 0) { 87 kfree_skb(skb); 88 skb_queue_purge(&msg->msg_frags); 89 if (msg->cb) 90 msg->cb(msg->cb_context, NULL, r); 91 kfree(msg); 92 break; 93 } 94 } 95 96 if (r) 97 goto next_msg; 98 99 if (msg->wait_response == false) { 100 kfree(msg); 101 goto next_msg; 102 } 103 104 hdev->cmd_pending_msg = msg; 105 mod_timer(&hdev->cmd_timer, jiffies + 106 msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay)); 107 108 exit: 109 mutex_unlock(&hdev->msg_tx_mutex); 110 } 111 112 static void nfc_hci_msg_rx_work(struct work_struct *work) 113 { 114 struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev, 115 msg_rx_work); 116 struct sk_buff *skb; 117 struct hcp_message *message; 118 u8 pipe; 119 u8 type; 120 u8 instruction; 121 122 while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) { 123 pipe = skb->data[0]; 124 skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN); 125 message = (struct hcp_message *)skb->data; 126 type = HCP_MSG_GET_TYPE(message->header); 127 instruction = HCP_MSG_GET_CMD(message->header); 128 skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN); 129 130 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb); 131 } 132 } 133 134 static void __nfc_hci_cmd_completion(struct nfc_hci_dev *hdev, int err, 135 struct sk_buff *skb) 136 { 137 del_timer_sync(&hdev->cmd_timer); 138 139 if (hdev->cmd_pending_msg->cb) 140 hdev->cmd_pending_msg->cb(hdev->cmd_pending_msg->cb_context, 141 skb, err); 142 else 143 kfree_skb(skb); 144 145 kfree(hdev->cmd_pending_msg); 146 hdev->cmd_pending_msg = NULL; 147 148 schedule_work(&hdev->msg_tx_work); 149 } 150 151 void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result, 152 struct sk_buff *skb) 153 { 154 mutex_lock(&hdev->msg_tx_mutex); 155 156 if (hdev->cmd_pending_msg == NULL) { 157 kfree_skb(skb); 158 goto exit; 159 } 160 161 __nfc_hci_cmd_completion(hdev, nfc_hci_result_to_errno(result), skb); 162 163 exit: 164 mutex_unlock(&hdev->msg_tx_mutex); 165 } 166 167 void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd, 168 struct sk_buff *skb) 169 { 170 int r = 0; 171 u8 gate = nfc_hci_pipe2gate(hdev, pipe); 172 u8 local_gate, new_pipe; 173 u8 gate_opened = 0x00; 174 175 pr_debug("from gate %x pipe %x cmd %x\n", gate, pipe, cmd); 176 177 switch (cmd) { 178 case NFC_HCI_ADM_NOTIFY_PIPE_CREATED: 179 if (skb->len != 5) { 180 r = -EPROTO; 181 break; 182 } 183 184 local_gate = skb->data[3]; 185 new_pipe = skb->data[4]; 186 nfc_hci_send_response(hdev, gate, NFC_HCI_ANY_OK, NULL, 0); 187 188 /* save the new created pipe and bind with local gate, 189 * the description for skb->data[3] is destination gate id 190 * but since we received this cmd from host controller, we 191 * are the destination and it is our local gate 192 */ 193 hdev->gate2pipe[local_gate] = new_pipe; 194 break; 195 case NFC_HCI_ANY_OPEN_PIPE: 196 /* if the pipe is already created, we allow remote host to 197 * open it 198 */ 199 if (gate != 0xff) 200 nfc_hci_send_response(hdev, gate, NFC_HCI_ANY_OK, 201 &gate_opened, 1); 202 break; 203 case NFC_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED: 204 nfc_hci_send_response(hdev, gate, NFC_HCI_ANY_OK, NULL, 0); 205 break; 206 default: 207 pr_info("Discarded unknown cmd %x to gate %x\n", cmd, gate); 208 r = -EINVAL; 209 break; 210 } 211 212 kfree_skb(skb); 213 } 214 215 u32 nfc_hci_sak_to_protocol(u8 sak) 216 { 217 switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) { 218 case NFC_HCI_TYPE_A_SEL_PROT_MIFARE: 219 return NFC_PROTO_MIFARE_MASK; 220 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443: 221 return NFC_PROTO_ISO14443_MASK; 222 case NFC_HCI_TYPE_A_SEL_PROT_DEP: 223 return NFC_PROTO_NFC_DEP_MASK; 224 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP: 225 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK; 226 default: 227 return 0xffffffff; 228 } 229 } 230 EXPORT_SYMBOL(nfc_hci_sak_to_protocol); 231 232 int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate) 233 { 234 struct nfc_target *targets; 235 struct sk_buff *atqa_skb = NULL; 236 struct sk_buff *sak_skb = NULL; 237 struct sk_buff *uid_skb = NULL; 238 int r; 239 240 pr_debug("from gate %d\n", gate); 241 242 targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL); 243 if (targets == NULL) 244 return -ENOMEM; 245 246 switch (gate) { 247 case NFC_HCI_RF_READER_A_GATE: 248 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE, 249 NFC_HCI_RF_READER_A_ATQA, &atqa_skb); 250 if (r < 0) 251 goto exit; 252 253 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE, 254 NFC_HCI_RF_READER_A_SAK, &sak_skb); 255 if (r < 0) 256 goto exit; 257 258 if (atqa_skb->len != 2 || sak_skb->len != 1) { 259 r = -EPROTO; 260 goto exit; 261 } 262 263 targets->supported_protocols = 264 nfc_hci_sak_to_protocol(sak_skb->data[0]); 265 if (targets->supported_protocols == 0xffffffff) { 266 r = -EPROTO; 267 goto exit; 268 } 269 270 targets->sens_res = be16_to_cpu(*(__be16 *)atqa_skb->data); 271 targets->sel_res = sak_skb->data[0]; 272 273 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE, 274 NFC_HCI_RF_READER_A_UID, &uid_skb); 275 if (r < 0) 276 goto exit; 277 278 if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) { 279 r = -EPROTO; 280 goto exit; 281 } 282 283 memcpy(targets->nfcid1, uid_skb->data, uid_skb->len); 284 targets->nfcid1_len = uid_skb->len; 285 286 if (hdev->ops->complete_target_discovered) { 287 r = hdev->ops->complete_target_discovered(hdev, gate, 288 targets); 289 if (r < 0) 290 goto exit; 291 } 292 break; 293 case NFC_HCI_RF_READER_B_GATE: 294 targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK; 295 break; 296 default: 297 if (hdev->ops->target_from_gate) 298 r = hdev->ops->target_from_gate(hdev, gate, targets); 299 else 300 r = -EPROTO; 301 if (r < 0) 302 goto exit; 303 304 if (hdev->ops->complete_target_discovered) { 305 r = hdev->ops->complete_target_discovered(hdev, gate, 306 targets); 307 if (r < 0) 308 goto exit; 309 } 310 break; 311 } 312 313 /* if driver set the new gate, we will skip the old one */ 314 if (targets->hci_reader_gate == 0x00) 315 targets->hci_reader_gate = gate; 316 317 r = nfc_targets_found(hdev->ndev, targets, 1); 318 319 exit: 320 kfree(targets); 321 kfree_skb(atqa_skb); 322 kfree_skb(sak_skb); 323 kfree_skb(uid_skb); 324 325 return r; 326 } 327 EXPORT_SYMBOL(nfc_hci_target_discovered); 328 329 void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event, 330 struct sk_buff *skb) 331 { 332 int r = 0; 333 u8 gate = nfc_hci_pipe2gate(hdev, pipe); 334 335 if (gate == 0xff) { 336 pr_err("Discarded event %x to unopened pipe %x\n", event, pipe); 337 goto exit; 338 } 339 340 if (hdev->ops->event_received) { 341 r = hdev->ops->event_received(hdev, gate, event, skb); 342 if (r <= 0) 343 goto exit_noskb; 344 } 345 346 switch (event) { 347 case NFC_HCI_EVT_TARGET_DISCOVERED: 348 if (skb->len < 1) { /* no status data? */ 349 r = -EPROTO; 350 goto exit; 351 } 352 353 if (skb->data[0] == 3) { 354 /* TODO: Multiple targets in field, none activated 355 * poll is supposedly stopped, but there is no 356 * single target to activate, so nothing to report 357 * up. 358 * if we need to restart poll, we must save the 359 * protocols from the initial poll and reuse here. 360 */ 361 } 362 363 if (skb->data[0] != 0) { 364 r = -EPROTO; 365 goto exit; 366 } 367 368 r = nfc_hci_target_discovered(hdev, gate); 369 break; 370 default: 371 pr_info("Discarded unknown event %x to gate %x\n", event, gate); 372 r = -EINVAL; 373 break; 374 } 375 376 exit: 377 kfree_skb(skb); 378 379 exit_noskb: 380 if (r) 381 nfc_hci_driver_failure(hdev, r); 382 } 383 384 static void nfc_hci_cmd_timeout(unsigned long data) 385 { 386 struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data; 387 388 schedule_work(&hdev->msg_tx_work); 389 } 390 391 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count, 392 struct nfc_hci_gate *gates) 393 { 394 int r; 395 while (gate_count--) { 396 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID, 397 gates->gate, gates->pipe); 398 if (r < 0) 399 return r; 400 gates++; 401 } 402 403 return 0; 404 } 405 406 static int hci_dev_session_init(struct nfc_hci_dev *hdev) 407 { 408 struct sk_buff *skb = NULL; 409 int r; 410 411 if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE) 412 return -EPROTO; 413 414 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID, 415 hdev->init_data.gates[0].gate, 416 hdev->init_data.gates[0].pipe); 417 if (r < 0) 418 goto exit; 419 420 r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE, 421 NFC_HCI_ADMIN_SESSION_IDENTITY, &skb); 422 if (r < 0) 423 goto disconnect_all; 424 425 if (skb->len && skb->len == strlen(hdev->init_data.session_id) && 426 (memcmp(hdev->init_data.session_id, skb->data, 427 skb->len) == 0) && hdev->ops->load_session) { 428 /* Restore gate<->pipe table from some proprietary location. */ 429 430 r = hdev->ops->load_session(hdev); 431 432 if (r < 0) 433 goto disconnect_all; 434 } else { 435 436 r = nfc_hci_disconnect_all_gates(hdev); 437 if (r < 0) 438 goto exit; 439 440 r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count, 441 hdev->init_data.gates); 442 if (r < 0) 443 goto disconnect_all; 444 445 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE, 446 NFC_HCI_ADMIN_SESSION_IDENTITY, 447 hdev->init_data.session_id, 448 strlen(hdev->init_data.session_id)); 449 } 450 if (r == 0) 451 goto exit; 452 453 disconnect_all: 454 nfc_hci_disconnect_all_gates(hdev); 455 456 exit: 457 kfree_skb(skb); 458 459 return r; 460 } 461 462 static int hci_dev_version(struct nfc_hci_dev *hdev) 463 { 464 int r; 465 struct sk_buff *skb; 466 467 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE, 468 NFC_HCI_ID_MGMT_VERSION_SW, &skb); 469 if (r == -EOPNOTSUPP) { 470 pr_info("Software/Hardware info not available\n"); 471 return 0; 472 } 473 if (r < 0) 474 return r; 475 476 if (skb->len != 3) { 477 kfree_skb(skb); 478 return -EINVAL; 479 } 480 481 hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4; 482 hdev->sw_patch = skb->data[0] & 0x0f; 483 hdev->sw_flashlib_major = skb->data[1]; 484 hdev->sw_flashlib_minor = skb->data[2]; 485 486 kfree_skb(skb); 487 488 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE, 489 NFC_HCI_ID_MGMT_VERSION_HW, &skb); 490 if (r < 0) 491 return r; 492 493 if (skb->len != 3) { 494 kfree_skb(skb); 495 return -EINVAL; 496 } 497 498 hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5; 499 hdev->hw_version = skb->data[0] & 0x1f; 500 hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6; 501 hdev->hw_software = skb->data[1] & 0x3f; 502 hdev->hw_bsid = skb->data[2]; 503 504 kfree_skb(skb); 505 506 pr_info("SOFTWARE INFO:\n"); 507 pr_info("RomLib : %d\n", hdev->sw_romlib); 508 pr_info("Patch : %d\n", hdev->sw_patch); 509 pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major); 510 pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor); 511 pr_info("HARDWARE INFO:\n"); 512 pr_info("Derivative : %d\n", hdev->hw_derivative); 513 pr_info("HW Version : %d\n", hdev->hw_version); 514 pr_info("#MPW : %d\n", hdev->hw_mpw); 515 pr_info("Software : %d\n", hdev->hw_software); 516 pr_info("BSID Version : %d\n", hdev->hw_bsid); 517 518 return 0; 519 } 520 521 static int hci_dev_up(struct nfc_dev *nfc_dev) 522 { 523 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 524 int r = 0; 525 526 if (hdev->ops->open) { 527 r = hdev->ops->open(hdev); 528 if (r < 0) 529 return r; 530 } 531 532 r = nfc_llc_start(hdev->llc); 533 if (r < 0) 534 goto exit_close; 535 536 r = hci_dev_session_init(hdev); 537 if (r < 0) 538 goto exit_llc; 539 540 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, 541 NFC_HCI_EVT_END_OPERATION, NULL, 0); 542 if (r < 0) 543 goto exit_llc; 544 545 if (hdev->ops->hci_ready) { 546 r = hdev->ops->hci_ready(hdev); 547 if (r < 0) 548 goto exit_llc; 549 } 550 551 r = hci_dev_version(hdev); 552 if (r < 0) 553 goto exit_llc; 554 555 return 0; 556 557 exit_llc: 558 nfc_llc_stop(hdev->llc); 559 560 exit_close: 561 if (hdev->ops->close) 562 hdev->ops->close(hdev); 563 564 return r; 565 } 566 567 static int hci_dev_down(struct nfc_dev *nfc_dev) 568 { 569 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 570 571 nfc_llc_stop(hdev->llc); 572 573 if (hdev->ops->close) 574 hdev->ops->close(hdev); 575 576 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe)); 577 578 return 0; 579 } 580 581 static int hci_start_poll(struct nfc_dev *nfc_dev, 582 u32 im_protocols, u32 tm_protocols) 583 { 584 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 585 586 if (hdev->ops->start_poll) 587 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols); 588 else 589 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, 590 NFC_HCI_EVT_READER_REQUESTED, 591 NULL, 0); 592 } 593 594 static void hci_stop_poll(struct nfc_dev *nfc_dev) 595 { 596 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 597 598 if (hdev->ops->stop_poll) 599 hdev->ops->stop_poll(hdev); 600 else 601 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, 602 NFC_HCI_EVT_END_OPERATION, NULL, 0); 603 } 604 605 static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target, 606 __u8 comm_mode, __u8 *gb, size_t gb_len) 607 { 608 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 609 610 if (!hdev->ops->dep_link_up) 611 return 0; 612 613 return hdev->ops->dep_link_up(hdev, target, comm_mode, 614 gb, gb_len); 615 } 616 617 static int hci_dep_link_down(struct nfc_dev *nfc_dev) 618 { 619 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 620 621 if (!hdev->ops->dep_link_down) 622 return 0; 623 624 return hdev->ops->dep_link_down(hdev); 625 } 626 627 static int hci_activate_target(struct nfc_dev *nfc_dev, 628 struct nfc_target *target, u32 protocol) 629 { 630 return 0; 631 } 632 633 static void hci_deactivate_target(struct nfc_dev *nfc_dev, 634 struct nfc_target *target) 635 { 636 } 637 638 #define HCI_CB_TYPE_TRANSCEIVE 1 639 640 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err) 641 { 642 struct nfc_hci_dev *hdev = context; 643 644 switch (hdev->async_cb_type) { 645 case HCI_CB_TYPE_TRANSCEIVE: 646 /* 647 * TODO: Check RF Error indicator to make sure data is valid. 648 * It seems that HCI cmd can complete without error, but data 649 * can be invalid if an RF error occured? Ignore for now. 650 */ 651 if (err == 0) 652 skb_trim(skb, skb->len - 1); /* RF Err ind */ 653 654 hdev->async_cb(hdev->async_cb_context, skb, err); 655 break; 656 default: 657 if (err == 0) 658 kfree_skb(skb); 659 break; 660 } 661 } 662 663 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target, 664 struct sk_buff *skb, data_exchange_cb_t cb, 665 void *cb_context) 666 { 667 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 668 int r; 669 670 pr_debug("target_idx=%d\n", target->idx); 671 672 switch (target->hci_reader_gate) { 673 case NFC_HCI_RF_READER_A_GATE: 674 case NFC_HCI_RF_READER_B_GATE: 675 if (hdev->ops->im_transceive) { 676 r = hdev->ops->im_transceive(hdev, target, skb, cb, 677 cb_context); 678 if (r <= 0) /* handled */ 679 break; 680 } 681 682 *skb_push(skb, 1) = 0; /* CTR, see spec:10.2.2.1 */ 683 684 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE; 685 hdev->async_cb = cb; 686 hdev->async_cb_context = cb_context; 687 688 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate, 689 NFC_HCI_WR_XCHG_DATA, skb->data, 690 skb->len, hci_transceive_cb, hdev); 691 break; 692 default: 693 if (hdev->ops->im_transceive) { 694 r = hdev->ops->im_transceive(hdev, target, skb, cb, 695 cb_context); 696 if (r == 1) 697 r = -ENOTSUPP; 698 } else { 699 r = -ENOTSUPP; 700 } 701 break; 702 } 703 704 kfree_skb(skb); 705 706 return r; 707 } 708 709 static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb) 710 { 711 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 712 713 if (!hdev->ops->tm_send) { 714 kfree_skb(skb); 715 return -ENOTSUPP; 716 } 717 718 return hdev->ops->tm_send(hdev, skb); 719 } 720 721 static int hci_check_presence(struct nfc_dev *nfc_dev, 722 struct nfc_target *target) 723 { 724 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 725 726 if (!hdev->ops->check_presence) 727 return 0; 728 729 return hdev->ops->check_presence(hdev, target); 730 } 731 732 static int hci_discover_se(struct nfc_dev *nfc_dev) 733 { 734 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 735 736 if (hdev->ops->discover_se) 737 return hdev->ops->discover_se(hdev); 738 739 return 0; 740 } 741 742 static int hci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx) 743 { 744 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 745 746 if (hdev->ops->enable_se) 747 return hdev->ops->enable_se(hdev, se_idx); 748 749 return 0; 750 } 751 752 static int hci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx) 753 { 754 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 755 756 if (hdev->ops->disable_se) 757 return hdev->ops->disable_se(hdev, se_idx); 758 759 return 0; 760 } 761 762 static int hci_se_io(struct nfc_dev *nfc_dev, u32 se_idx, 763 u8 *apdu, size_t apdu_length, 764 se_io_cb_t cb, void *cb_context) 765 { 766 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 767 768 if (hdev->ops->se_io) 769 return hdev->ops->se_io(hdev, se_idx, apdu, 770 apdu_length, cb, cb_context); 771 772 return 0; 773 } 774 775 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err) 776 { 777 mutex_lock(&hdev->msg_tx_mutex); 778 779 if (hdev->cmd_pending_msg == NULL) { 780 nfc_driver_failure(hdev->ndev, err); 781 goto exit; 782 } 783 784 __nfc_hci_cmd_completion(hdev, err, NULL); 785 786 exit: 787 mutex_unlock(&hdev->msg_tx_mutex); 788 } 789 790 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err) 791 { 792 nfc_hci_failure(hdev, err); 793 } 794 795 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb) 796 { 797 struct hcp_packet *packet; 798 u8 type; 799 u8 instruction; 800 struct sk_buff *hcp_skb; 801 u8 pipe; 802 struct sk_buff *frag_skb; 803 int msg_len; 804 805 packet = (struct hcp_packet *)skb->data; 806 if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) { 807 skb_queue_tail(&hdev->rx_hcp_frags, skb); 808 return; 809 } 810 811 /* it's the last fragment. Does it need re-aggregation? */ 812 if (skb_queue_len(&hdev->rx_hcp_frags)) { 813 pipe = packet->header & NFC_HCI_FRAGMENT; 814 skb_queue_tail(&hdev->rx_hcp_frags, skb); 815 816 msg_len = 0; 817 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) { 818 msg_len += (frag_skb->len - 819 NFC_HCI_HCP_PACKET_HEADER_LEN); 820 } 821 822 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN + 823 msg_len, GFP_KERNEL); 824 if (hcp_skb == NULL) { 825 nfc_hci_failure(hdev, -ENOMEM); 826 return; 827 } 828 829 *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe; 830 831 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) { 832 msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN; 833 memcpy(skb_put(hcp_skb, msg_len), 834 frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN, 835 msg_len); 836 } 837 838 skb_queue_purge(&hdev->rx_hcp_frags); 839 } else { 840 packet->header &= NFC_HCI_FRAGMENT; 841 hcp_skb = skb; 842 } 843 844 /* if this is a response, dispatch immediately to 845 * unblock waiting cmd context. Otherwise, enqueue to dispatch 846 * in separate context where handler can also execute command. 847 */ 848 packet = (struct hcp_packet *)hcp_skb->data; 849 type = HCP_MSG_GET_TYPE(packet->message.header); 850 if (type == NFC_HCI_HCP_RESPONSE) { 851 pipe = packet->header; 852 instruction = HCP_MSG_GET_CMD(packet->message.header); 853 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN + 854 NFC_HCI_HCP_MESSAGE_HEADER_LEN); 855 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb); 856 } else { 857 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb); 858 schedule_work(&hdev->msg_rx_work); 859 } 860 } 861 862 static int hci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name) 863 { 864 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 865 866 if (!hdev->ops->fw_download) 867 return -ENOTSUPP; 868 869 return hdev->ops->fw_download(hdev, firmware_name); 870 } 871 872 static struct nfc_ops hci_nfc_ops = { 873 .dev_up = hci_dev_up, 874 .dev_down = hci_dev_down, 875 .start_poll = hci_start_poll, 876 .stop_poll = hci_stop_poll, 877 .dep_link_up = hci_dep_link_up, 878 .dep_link_down = hci_dep_link_down, 879 .activate_target = hci_activate_target, 880 .deactivate_target = hci_deactivate_target, 881 .im_transceive = hci_transceive, 882 .tm_send = hci_tm_send, 883 .check_presence = hci_check_presence, 884 .fw_download = hci_fw_download, 885 .discover_se = hci_discover_se, 886 .enable_se = hci_enable_se, 887 .disable_se = hci_disable_se, 888 .se_io = hci_se_io, 889 }; 890 891 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops, 892 struct nfc_hci_init_data *init_data, 893 unsigned long quirks, 894 u32 protocols, 895 const char *llc_name, 896 int tx_headroom, 897 int tx_tailroom, 898 int max_link_payload) 899 { 900 struct nfc_hci_dev *hdev; 901 902 if (ops->xmit == NULL) 903 return NULL; 904 905 if (protocols == 0) 906 return NULL; 907 908 hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL); 909 if (hdev == NULL) 910 return NULL; 911 912 hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit, 913 nfc_hci_recv_from_llc, tx_headroom, 914 tx_tailroom, nfc_hci_llc_failure); 915 if (hdev->llc == NULL) { 916 kfree(hdev); 917 return NULL; 918 } 919 920 hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols, 921 tx_headroom + HCI_CMDS_HEADROOM, 922 tx_tailroom); 923 if (!hdev->ndev) { 924 nfc_llc_free(hdev->llc); 925 kfree(hdev); 926 return NULL; 927 } 928 929 hdev->ops = ops; 930 hdev->max_data_link_payload = max_link_payload; 931 hdev->init_data = *init_data; 932 933 nfc_set_drvdata(hdev->ndev, hdev); 934 935 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe)); 936 937 hdev->quirks = quirks; 938 939 return hdev; 940 } 941 EXPORT_SYMBOL(nfc_hci_allocate_device); 942 943 void nfc_hci_free_device(struct nfc_hci_dev *hdev) 944 { 945 nfc_free_device(hdev->ndev); 946 nfc_llc_free(hdev->llc); 947 kfree(hdev); 948 } 949 EXPORT_SYMBOL(nfc_hci_free_device); 950 951 int nfc_hci_register_device(struct nfc_hci_dev *hdev) 952 { 953 mutex_init(&hdev->msg_tx_mutex); 954 955 INIT_LIST_HEAD(&hdev->msg_tx_queue); 956 957 INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work); 958 959 init_timer(&hdev->cmd_timer); 960 hdev->cmd_timer.data = (unsigned long)hdev; 961 hdev->cmd_timer.function = nfc_hci_cmd_timeout; 962 963 skb_queue_head_init(&hdev->rx_hcp_frags); 964 965 INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work); 966 967 skb_queue_head_init(&hdev->msg_rx_queue); 968 969 return nfc_register_device(hdev->ndev); 970 } 971 EXPORT_SYMBOL(nfc_hci_register_device); 972 973 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev) 974 { 975 struct hci_msg *msg, *n; 976 977 mutex_lock(&hdev->msg_tx_mutex); 978 979 if (hdev->cmd_pending_msg) { 980 if (hdev->cmd_pending_msg->cb) 981 hdev->cmd_pending_msg->cb( 982 hdev->cmd_pending_msg->cb_context, 983 NULL, -ESHUTDOWN); 984 kfree(hdev->cmd_pending_msg); 985 hdev->cmd_pending_msg = NULL; 986 } 987 988 hdev->shutting_down = true; 989 990 mutex_unlock(&hdev->msg_tx_mutex); 991 992 del_timer_sync(&hdev->cmd_timer); 993 cancel_work_sync(&hdev->msg_tx_work); 994 995 cancel_work_sync(&hdev->msg_rx_work); 996 997 nfc_unregister_device(hdev->ndev); 998 999 skb_queue_purge(&hdev->rx_hcp_frags); 1000 skb_queue_purge(&hdev->msg_rx_queue); 1001 1002 list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) { 1003 list_del(&msg->msg_l); 1004 skb_queue_purge(&msg->msg_frags); 1005 kfree(msg); 1006 } 1007 } 1008 EXPORT_SYMBOL(nfc_hci_unregister_device); 1009 1010 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata) 1011 { 1012 hdev->clientdata = clientdata; 1013 } 1014 EXPORT_SYMBOL(nfc_hci_set_clientdata); 1015 1016 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev) 1017 { 1018 return hdev->clientdata; 1019 } 1020 EXPORT_SYMBOL(nfc_hci_get_clientdata); 1021 1022 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err) 1023 { 1024 nfc_hci_failure(hdev, err); 1025 } 1026 EXPORT_SYMBOL(nfc_hci_driver_failure); 1027 1028 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb) 1029 { 1030 nfc_llc_rcv_from_drv(hdev->llc, skb); 1031 } 1032 EXPORT_SYMBOL(nfc_hci_recv_frame); 1033 1034 static int __init nfc_hci_init(void) 1035 { 1036 return nfc_llc_init(); 1037 } 1038 1039 static void __exit nfc_hci_exit(void) 1040 { 1041 nfc_llc_exit(); 1042 } 1043 1044 subsys_initcall(nfc_hci_init); 1045 module_exit(nfc_hci_exit); 1046 1047 MODULE_LICENSE("GPL"); 1048 MODULE_DESCRIPTION("NFC HCI Core"); 1049