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, write to the 16 * Free Software Foundation, Inc., 17 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 18 */ 19 20 #define pr_fmt(fmt) "hci: %s: " fmt, __func__ 21 22 #include <linux/init.h> 23 #include <linux/kernel.h> 24 #include <linux/module.h> 25 #include <linux/nfc.h> 26 27 #include <net/nfc/nfc.h> 28 #include <net/nfc/hci.h> 29 #include <net/nfc/llc.h> 30 31 #include "hci.h" 32 33 /* Largest headroom needed for outgoing HCI commands */ 34 #define HCI_CMDS_HEADROOM 1 35 36 int nfc_hci_result_to_errno(u8 result) 37 { 38 switch (result) { 39 case NFC_HCI_ANY_OK: 40 return 0; 41 case NFC_HCI_ANY_E_REG_PAR_UNKNOWN: 42 return -EOPNOTSUPP; 43 case NFC_HCI_ANY_E_TIMEOUT: 44 return -ETIME; 45 default: 46 return -1; 47 } 48 } 49 EXPORT_SYMBOL(nfc_hci_result_to_errno); 50 51 static void nfc_hci_msg_tx_work(struct work_struct *work) 52 { 53 struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev, 54 msg_tx_work); 55 struct hci_msg *msg; 56 struct sk_buff *skb; 57 int r = 0; 58 59 mutex_lock(&hdev->msg_tx_mutex); 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 kfree_skb(skb); 171 } 172 173 u32 nfc_hci_sak_to_protocol(u8 sak) 174 { 175 switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) { 176 case NFC_HCI_TYPE_A_SEL_PROT_MIFARE: 177 return NFC_PROTO_MIFARE_MASK; 178 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443: 179 return NFC_PROTO_ISO14443_MASK; 180 case NFC_HCI_TYPE_A_SEL_PROT_DEP: 181 return NFC_PROTO_NFC_DEP_MASK; 182 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP: 183 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK; 184 default: 185 return 0xffffffff; 186 } 187 } 188 EXPORT_SYMBOL(nfc_hci_sak_to_protocol); 189 190 int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate) 191 { 192 struct nfc_target *targets; 193 struct sk_buff *atqa_skb = NULL; 194 struct sk_buff *sak_skb = NULL; 195 struct sk_buff *uid_skb = NULL; 196 int r; 197 198 pr_debug("from gate %d\n", gate); 199 200 targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL); 201 if (targets == NULL) 202 return -ENOMEM; 203 204 switch (gate) { 205 case NFC_HCI_RF_READER_A_GATE: 206 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE, 207 NFC_HCI_RF_READER_A_ATQA, &atqa_skb); 208 if (r < 0) 209 goto exit; 210 211 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE, 212 NFC_HCI_RF_READER_A_SAK, &sak_skb); 213 if (r < 0) 214 goto exit; 215 216 if (atqa_skb->len != 2 || sak_skb->len != 1) { 217 r = -EPROTO; 218 goto exit; 219 } 220 221 targets->supported_protocols = 222 nfc_hci_sak_to_protocol(sak_skb->data[0]); 223 if (targets->supported_protocols == 0xffffffff) { 224 r = -EPROTO; 225 goto exit; 226 } 227 228 targets->sens_res = be16_to_cpu(*(u16 *)atqa_skb->data); 229 targets->sel_res = sak_skb->data[0]; 230 231 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE, 232 NFC_HCI_RF_READER_A_UID, &uid_skb); 233 if (r < 0) 234 goto exit; 235 236 if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) { 237 r = -EPROTO; 238 goto exit; 239 } 240 241 memcpy(targets->nfcid1, uid_skb->data, uid_skb->len); 242 targets->nfcid1_len = uid_skb->len; 243 244 if (hdev->ops->complete_target_discovered) { 245 r = hdev->ops->complete_target_discovered(hdev, gate, 246 targets); 247 if (r < 0) 248 goto exit; 249 } 250 break; 251 case NFC_HCI_RF_READER_B_GATE: 252 targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK; 253 break; 254 default: 255 if (hdev->ops->target_from_gate) 256 r = hdev->ops->target_from_gate(hdev, gate, targets); 257 else 258 r = -EPROTO; 259 if (r < 0) 260 goto exit; 261 262 if (hdev->ops->complete_target_discovered) { 263 r = hdev->ops->complete_target_discovered(hdev, gate, 264 targets); 265 if (r < 0) 266 goto exit; 267 } 268 break; 269 } 270 271 /* if driver set the new gate, we will skip the old one */ 272 if (targets->hci_reader_gate == 0x00) 273 targets->hci_reader_gate = gate; 274 275 r = nfc_targets_found(hdev->ndev, targets, 1); 276 277 exit: 278 kfree(targets); 279 kfree_skb(atqa_skb); 280 kfree_skb(sak_skb); 281 kfree_skb(uid_skb); 282 283 return r; 284 } 285 EXPORT_SYMBOL(nfc_hci_target_discovered); 286 287 void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event, 288 struct sk_buff *skb) 289 { 290 int r = 0; 291 u8 gate = nfc_hci_pipe2gate(hdev, pipe); 292 293 if (gate == 0xff) { 294 pr_err("Discarded event %x to unopened pipe %x\n", event, pipe); 295 goto exit; 296 } 297 298 switch (event) { 299 case NFC_HCI_EVT_TARGET_DISCOVERED: 300 if (skb->len < 1) { /* no status data? */ 301 r = -EPROTO; 302 goto exit; 303 } 304 305 if (skb->data[0] == 3) { 306 /* TODO: Multiple targets in field, none activated 307 * poll is supposedly stopped, but there is no 308 * single target to activate, so nothing to report 309 * up. 310 * if we need to restart poll, we must save the 311 * protocols from the initial poll and reuse here. 312 */ 313 } 314 315 if (skb->data[0] != 0) { 316 r = -EPROTO; 317 goto exit; 318 } 319 320 r = nfc_hci_target_discovered(hdev, gate); 321 break; 322 default: 323 if (hdev->ops->event_received) { 324 hdev->ops->event_received(hdev, gate, event, skb); 325 return; 326 } 327 328 break; 329 } 330 331 exit: 332 kfree_skb(skb); 333 334 if (r) { 335 /* TODO: There was an error dispatching the event, 336 * how to propagate up to nfc core? 337 */ 338 } 339 } 340 341 static void nfc_hci_cmd_timeout(unsigned long data) 342 { 343 struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data; 344 345 schedule_work(&hdev->msg_tx_work); 346 } 347 348 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count, 349 struct nfc_hci_gate *gates) 350 { 351 int r; 352 while (gate_count--) { 353 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID, 354 gates->gate, gates->pipe); 355 if (r < 0) 356 return r; 357 gates++; 358 } 359 360 return 0; 361 } 362 363 static int hci_dev_session_init(struct nfc_hci_dev *hdev) 364 { 365 struct sk_buff *skb = NULL; 366 int r; 367 368 if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE) 369 return -EPROTO; 370 371 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID, 372 hdev->init_data.gates[0].gate, 373 hdev->init_data.gates[0].pipe); 374 if (r < 0) 375 goto exit; 376 377 r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE, 378 NFC_HCI_ADMIN_SESSION_IDENTITY, &skb); 379 if (r < 0) 380 goto disconnect_all; 381 382 if (skb->len && skb->len == strlen(hdev->init_data.session_id)) 383 if (memcmp(hdev->init_data.session_id, skb->data, 384 skb->len) == 0) { 385 /* TODO ELa: restore gate<->pipe table from 386 * some TBD location. 387 * note: it doesn't seem possible to get the chip 388 * currently open gate/pipe table. 389 * It is only possible to obtain the supported 390 * gate list. 391 */ 392 393 /* goto exit 394 * For now, always do a full initialization */ 395 } 396 397 r = nfc_hci_disconnect_all_gates(hdev); 398 if (r < 0) 399 goto exit; 400 401 r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count, 402 hdev->init_data.gates); 403 if (r < 0) 404 goto disconnect_all; 405 406 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE, 407 NFC_HCI_ADMIN_SESSION_IDENTITY, 408 hdev->init_data.session_id, 409 strlen(hdev->init_data.session_id)); 410 if (r == 0) 411 goto exit; 412 413 disconnect_all: 414 nfc_hci_disconnect_all_gates(hdev); 415 416 exit: 417 kfree_skb(skb); 418 419 return r; 420 } 421 422 static int hci_dev_version(struct nfc_hci_dev *hdev) 423 { 424 int r; 425 struct sk_buff *skb; 426 427 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE, 428 NFC_HCI_ID_MGMT_VERSION_SW, &skb); 429 if (r == -EOPNOTSUPP) { 430 pr_info("Software/Hardware info not available\n"); 431 return 0; 432 } 433 if (r < 0) 434 return r; 435 436 if (skb->len != 3) { 437 kfree_skb(skb); 438 return -EINVAL; 439 } 440 441 hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4; 442 hdev->sw_patch = skb->data[0] & 0x0f; 443 hdev->sw_flashlib_major = skb->data[1]; 444 hdev->sw_flashlib_minor = skb->data[2]; 445 446 kfree_skb(skb); 447 448 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE, 449 NFC_HCI_ID_MGMT_VERSION_HW, &skb); 450 if (r < 0) 451 return r; 452 453 if (skb->len != 3) { 454 kfree_skb(skb); 455 return -EINVAL; 456 } 457 458 hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5; 459 hdev->hw_version = skb->data[0] & 0x1f; 460 hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6; 461 hdev->hw_software = skb->data[1] & 0x3f; 462 hdev->hw_bsid = skb->data[2]; 463 464 kfree_skb(skb); 465 466 pr_info("SOFTWARE INFO:\n"); 467 pr_info("RomLib : %d\n", hdev->sw_romlib); 468 pr_info("Patch : %d\n", hdev->sw_patch); 469 pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major); 470 pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor); 471 pr_info("HARDWARE INFO:\n"); 472 pr_info("Derivative : %d\n", hdev->hw_derivative); 473 pr_info("HW Version : %d\n", hdev->hw_version); 474 pr_info("#MPW : %d\n", hdev->hw_mpw); 475 pr_info("Software : %d\n", hdev->hw_software); 476 pr_info("BSID Version : %d\n", hdev->hw_bsid); 477 478 return 0; 479 } 480 481 static int hci_dev_up(struct nfc_dev *nfc_dev) 482 { 483 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 484 int r = 0; 485 486 if (hdev->ops->open) { 487 r = hdev->ops->open(hdev); 488 if (r < 0) 489 return r; 490 } 491 492 r = nfc_llc_start(hdev->llc); 493 if (r < 0) 494 goto exit_close; 495 496 r = hci_dev_session_init(hdev); 497 if (r < 0) 498 goto exit_llc; 499 500 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, 501 NFC_HCI_EVT_END_OPERATION, NULL, 0); 502 if (r < 0) 503 goto exit_llc; 504 505 if (hdev->ops->hci_ready) { 506 r = hdev->ops->hci_ready(hdev); 507 if (r < 0) 508 goto exit_llc; 509 } 510 511 r = hci_dev_version(hdev); 512 if (r < 0) 513 goto exit_llc; 514 515 return 0; 516 517 exit_llc: 518 nfc_llc_stop(hdev->llc); 519 520 exit_close: 521 if (hdev->ops->close) 522 hdev->ops->close(hdev); 523 524 return r; 525 } 526 527 static int hci_dev_down(struct nfc_dev *nfc_dev) 528 { 529 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 530 531 nfc_llc_stop(hdev->llc); 532 533 if (hdev->ops->close) 534 hdev->ops->close(hdev); 535 536 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe)); 537 538 return 0; 539 } 540 541 static int hci_start_poll(struct nfc_dev *nfc_dev, 542 u32 im_protocols, u32 tm_protocols) 543 { 544 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 545 546 if (hdev->ops->start_poll) 547 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols); 548 else 549 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, 550 NFC_HCI_EVT_READER_REQUESTED, 551 NULL, 0); 552 } 553 554 static void hci_stop_poll(struct nfc_dev *nfc_dev) 555 { 556 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 557 558 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, 559 NFC_HCI_EVT_END_OPERATION, NULL, 0); 560 } 561 562 static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target, 563 __u8 comm_mode, __u8 *gb, size_t gb_len) 564 { 565 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 566 567 if (hdev->ops->dep_link_up) 568 return hdev->ops->dep_link_up(hdev, target, comm_mode, 569 gb, gb_len); 570 571 return 0; 572 } 573 574 static int hci_dep_link_down(struct nfc_dev *nfc_dev) 575 { 576 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 577 578 if (hdev->ops->dep_link_down) 579 return hdev->ops->dep_link_down(hdev); 580 581 return 0; 582 } 583 584 static int hci_activate_target(struct nfc_dev *nfc_dev, 585 struct nfc_target *target, u32 protocol) 586 { 587 return 0; 588 } 589 590 static void hci_deactivate_target(struct nfc_dev *nfc_dev, 591 struct nfc_target *target) 592 { 593 } 594 595 #define HCI_CB_TYPE_TRANSCEIVE 1 596 597 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err) 598 { 599 struct nfc_hci_dev *hdev = context; 600 601 switch (hdev->async_cb_type) { 602 case HCI_CB_TYPE_TRANSCEIVE: 603 /* 604 * TODO: Check RF Error indicator to make sure data is valid. 605 * It seems that HCI cmd can complete without error, but data 606 * can be invalid if an RF error occured? Ignore for now. 607 */ 608 if (err == 0) 609 skb_trim(skb, skb->len - 1); /* RF Err ind */ 610 611 hdev->async_cb(hdev->async_cb_context, skb, err); 612 break; 613 default: 614 if (err == 0) 615 kfree_skb(skb); 616 break; 617 } 618 } 619 620 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target, 621 struct sk_buff *skb, data_exchange_cb_t cb, 622 void *cb_context) 623 { 624 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 625 int r; 626 627 pr_debug("target_idx=%d\n", target->idx); 628 629 switch (target->hci_reader_gate) { 630 case NFC_HCI_RF_READER_A_GATE: 631 case NFC_HCI_RF_READER_B_GATE: 632 if (hdev->ops->im_transceive) { 633 r = hdev->ops->im_transceive(hdev, target, skb, cb, 634 cb_context); 635 if (r <= 0) /* handled */ 636 break; 637 } 638 639 *skb_push(skb, 1) = 0; /* CTR, see spec:10.2.2.1 */ 640 641 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE; 642 hdev->async_cb = cb; 643 hdev->async_cb_context = cb_context; 644 645 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate, 646 NFC_HCI_WR_XCHG_DATA, skb->data, 647 skb->len, hci_transceive_cb, hdev); 648 break; 649 default: 650 if (hdev->ops->im_transceive) { 651 r = hdev->ops->im_transceive(hdev, target, skb, cb, 652 cb_context); 653 if (r == 1) 654 r = -ENOTSUPP; 655 } else { 656 r = -ENOTSUPP; 657 } 658 break; 659 } 660 661 kfree_skb(skb); 662 663 return r; 664 } 665 666 static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb) 667 { 668 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 669 670 if (hdev->ops->tm_send) 671 return hdev->ops->tm_send(hdev, skb); 672 else 673 return -ENOTSUPP; 674 } 675 676 static int hci_check_presence(struct nfc_dev *nfc_dev, 677 struct nfc_target *target) 678 { 679 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 680 681 if (hdev->ops->check_presence) 682 return hdev->ops->check_presence(hdev, target); 683 684 return 0; 685 } 686 687 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err) 688 { 689 mutex_lock(&hdev->msg_tx_mutex); 690 691 if (hdev->cmd_pending_msg == NULL) { 692 nfc_driver_failure(hdev->ndev, err); 693 goto exit; 694 } 695 696 __nfc_hci_cmd_completion(hdev, err, NULL); 697 698 exit: 699 mutex_unlock(&hdev->msg_tx_mutex); 700 } 701 702 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err) 703 { 704 nfc_hci_failure(hdev, err); 705 } 706 707 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb) 708 { 709 struct hcp_packet *packet; 710 u8 type; 711 u8 instruction; 712 struct sk_buff *hcp_skb; 713 u8 pipe; 714 struct sk_buff *frag_skb; 715 int msg_len; 716 717 packet = (struct hcp_packet *)skb->data; 718 if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) { 719 skb_queue_tail(&hdev->rx_hcp_frags, skb); 720 return; 721 } 722 723 /* it's the last fragment. Does it need re-aggregation? */ 724 if (skb_queue_len(&hdev->rx_hcp_frags)) { 725 pipe = packet->header & NFC_HCI_FRAGMENT; 726 skb_queue_tail(&hdev->rx_hcp_frags, skb); 727 728 msg_len = 0; 729 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) { 730 msg_len += (frag_skb->len - 731 NFC_HCI_HCP_PACKET_HEADER_LEN); 732 } 733 734 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN + 735 msg_len, GFP_KERNEL); 736 if (hcp_skb == NULL) { 737 nfc_hci_failure(hdev, -ENOMEM); 738 return; 739 } 740 741 *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe; 742 743 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) { 744 msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN; 745 memcpy(skb_put(hcp_skb, msg_len), 746 frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN, 747 msg_len); 748 } 749 750 skb_queue_purge(&hdev->rx_hcp_frags); 751 } else { 752 packet->header &= NFC_HCI_FRAGMENT; 753 hcp_skb = skb; 754 } 755 756 /* if this is a response, dispatch immediately to 757 * unblock waiting cmd context. Otherwise, enqueue to dispatch 758 * in separate context where handler can also execute command. 759 */ 760 packet = (struct hcp_packet *)hcp_skb->data; 761 type = HCP_MSG_GET_TYPE(packet->message.header); 762 if (type == NFC_HCI_HCP_RESPONSE) { 763 pipe = packet->header; 764 instruction = HCP_MSG_GET_CMD(packet->message.header); 765 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN + 766 NFC_HCI_HCP_MESSAGE_HEADER_LEN); 767 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb); 768 } else { 769 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb); 770 schedule_work(&hdev->msg_rx_work); 771 } 772 } 773 774 static struct nfc_ops hci_nfc_ops = { 775 .dev_up = hci_dev_up, 776 .dev_down = hci_dev_down, 777 .start_poll = hci_start_poll, 778 .stop_poll = hci_stop_poll, 779 .dep_link_up = hci_dep_link_up, 780 .dep_link_down = hci_dep_link_down, 781 .activate_target = hci_activate_target, 782 .deactivate_target = hci_deactivate_target, 783 .im_transceive = hci_transceive, 784 .tm_send = hci_tm_send, 785 .check_presence = hci_check_presence, 786 }; 787 788 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops, 789 struct nfc_hci_init_data *init_data, 790 u32 protocols, 791 const char *llc_name, 792 int tx_headroom, 793 int tx_tailroom, 794 int max_link_payload) 795 { 796 struct nfc_hci_dev *hdev; 797 798 if (ops->xmit == NULL) 799 return NULL; 800 801 if (protocols == 0) 802 return NULL; 803 804 hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL); 805 if (hdev == NULL) 806 return NULL; 807 808 hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit, 809 nfc_hci_recv_from_llc, tx_headroom, 810 tx_tailroom, nfc_hci_llc_failure); 811 if (hdev->llc == NULL) { 812 kfree(hdev); 813 return NULL; 814 } 815 816 hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols, 817 tx_headroom + HCI_CMDS_HEADROOM, 818 tx_tailroom); 819 if (!hdev->ndev) { 820 nfc_llc_free(hdev->llc); 821 kfree(hdev); 822 return NULL; 823 } 824 825 hdev->ops = ops; 826 hdev->max_data_link_payload = max_link_payload; 827 hdev->init_data = *init_data; 828 829 nfc_set_drvdata(hdev->ndev, hdev); 830 831 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe)); 832 833 return hdev; 834 } 835 EXPORT_SYMBOL(nfc_hci_allocate_device); 836 837 void nfc_hci_free_device(struct nfc_hci_dev *hdev) 838 { 839 nfc_free_device(hdev->ndev); 840 nfc_llc_free(hdev->llc); 841 kfree(hdev); 842 } 843 EXPORT_SYMBOL(nfc_hci_free_device); 844 845 int nfc_hci_register_device(struct nfc_hci_dev *hdev) 846 { 847 mutex_init(&hdev->msg_tx_mutex); 848 849 INIT_LIST_HEAD(&hdev->msg_tx_queue); 850 851 INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work); 852 853 init_timer(&hdev->cmd_timer); 854 hdev->cmd_timer.data = (unsigned long)hdev; 855 hdev->cmd_timer.function = nfc_hci_cmd_timeout; 856 857 skb_queue_head_init(&hdev->rx_hcp_frags); 858 859 INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work); 860 861 skb_queue_head_init(&hdev->msg_rx_queue); 862 863 return nfc_register_device(hdev->ndev); 864 } 865 EXPORT_SYMBOL(nfc_hci_register_device); 866 867 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev) 868 { 869 struct hci_msg *msg, *n; 870 871 skb_queue_purge(&hdev->rx_hcp_frags); 872 skb_queue_purge(&hdev->msg_rx_queue); 873 874 list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) { 875 list_del(&msg->msg_l); 876 skb_queue_purge(&msg->msg_frags); 877 kfree(msg); 878 } 879 880 del_timer_sync(&hdev->cmd_timer); 881 882 nfc_unregister_device(hdev->ndev); 883 884 cancel_work_sync(&hdev->msg_tx_work); 885 cancel_work_sync(&hdev->msg_rx_work); 886 } 887 EXPORT_SYMBOL(nfc_hci_unregister_device); 888 889 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata) 890 { 891 hdev->clientdata = clientdata; 892 } 893 EXPORT_SYMBOL(nfc_hci_set_clientdata); 894 895 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev) 896 { 897 return hdev->clientdata; 898 } 899 EXPORT_SYMBOL(nfc_hci_get_clientdata); 900 901 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err) 902 { 903 nfc_hci_failure(hdev, err); 904 } 905 EXPORT_SYMBOL(nfc_hci_driver_failure); 906 907 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb) 908 { 909 nfc_llc_rcv_from_drv(hdev->llc, skb); 910 } 911 EXPORT_SYMBOL(nfc_hci_recv_frame); 912 913 static int __init nfc_hci_init(void) 914 { 915 return nfc_llc_init(); 916 } 917 918 static void __exit nfc_hci_exit(void) 919 { 920 nfc_llc_exit(); 921 } 922 923 subsys_initcall(nfc_hci_init); 924 module_exit(nfc_hci_exit); 925 926 MODULE_LICENSE("GPL"); 927 MODULE_DESCRIPTION("NFC HCI Core"); 928