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 static 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_TIMEOUT: 42 return -ETIME; 43 default: 44 return -1; 45 } 46 } 47 48 static void nfc_hci_msg_tx_work(struct work_struct *work) 49 { 50 struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev, 51 msg_tx_work); 52 struct hci_msg *msg; 53 struct sk_buff *skb; 54 int r = 0; 55 56 mutex_lock(&hdev->msg_tx_mutex); 57 58 if (hdev->cmd_pending_msg) { 59 if (timer_pending(&hdev->cmd_timer) == 0) { 60 if (hdev->cmd_pending_msg->cb) 61 hdev->cmd_pending_msg->cb(hdev-> 62 cmd_pending_msg-> 63 cb_context, 64 NULL, 65 -ETIME); 66 kfree(hdev->cmd_pending_msg); 67 hdev->cmd_pending_msg = NULL; 68 } else 69 goto exit; 70 } 71 72 next_msg: 73 if (list_empty(&hdev->msg_tx_queue)) 74 goto exit; 75 76 msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l); 77 list_del(&msg->msg_l); 78 79 pr_debug("msg_tx_queue has a cmd to send\n"); 80 while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) { 81 r = nfc_llc_xmit_from_hci(hdev->llc, skb); 82 if (r < 0) { 83 kfree_skb(skb); 84 skb_queue_purge(&msg->msg_frags); 85 if (msg->cb) 86 msg->cb(msg->cb_context, NULL, r); 87 kfree(msg); 88 break; 89 } 90 } 91 92 if (r) 93 goto next_msg; 94 95 if (msg->wait_response == false) { 96 kfree(msg); 97 goto next_msg; 98 } 99 100 hdev->cmd_pending_msg = msg; 101 mod_timer(&hdev->cmd_timer, jiffies + 102 msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay)); 103 104 exit: 105 mutex_unlock(&hdev->msg_tx_mutex); 106 } 107 108 static void nfc_hci_msg_rx_work(struct work_struct *work) 109 { 110 struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev, 111 msg_rx_work); 112 struct sk_buff *skb; 113 struct hcp_message *message; 114 u8 pipe; 115 u8 type; 116 u8 instruction; 117 118 while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) { 119 pipe = skb->data[0]; 120 skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN); 121 message = (struct hcp_message *)skb->data; 122 type = HCP_MSG_GET_TYPE(message->header); 123 instruction = HCP_MSG_GET_CMD(message->header); 124 skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN); 125 126 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb); 127 } 128 } 129 130 static void __nfc_hci_cmd_completion(struct nfc_hci_dev *hdev, int err, 131 struct sk_buff *skb) 132 { 133 del_timer_sync(&hdev->cmd_timer); 134 135 if (hdev->cmd_pending_msg->cb) 136 hdev->cmd_pending_msg->cb(hdev->cmd_pending_msg->cb_context, 137 skb, err); 138 else 139 kfree_skb(skb); 140 141 kfree(hdev->cmd_pending_msg); 142 hdev->cmd_pending_msg = NULL; 143 144 schedule_work(&hdev->msg_tx_work); 145 } 146 147 void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result, 148 struct sk_buff *skb) 149 { 150 mutex_lock(&hdev->msg_tx_mutex); 151 152 if (hdev->cmd_pending_msg == NULL) { 153 kfree_skb(skb); 154 goto exit; 155 } 156 157 __nfc_hci_cmd_completion(hdev, nfc_hci_result_to_errno(result), skb); 158 159 exit: 160 mutex_unlock(&hdev->msg_tx_mutex); 161 } 162 163 void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd, 164 struct sk_buff *skb) 165 { 166 kfree_skb(skb); 167 } 168 169 static u32 nfc_hci_sak_to_protocol(u8 sak) 170 { 171 switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) { 172 case NFC_HCI_TYPE_A_SEL_PROT_MIFARE: 173 return NFC_PROTO_MIFARE_MASK; 174 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443: 175 return NFC_PROTO_ISO14443_MASK; 176 case NFC_HCI_TYPE_A_SEL_PROT_DEP: 177 return NFC_PROTO_NFC_DEP_MASK; 178 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP: 179 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK; 180 default: 181 return 0xffffffff; 182 } 183 } 184 185 static int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate) 186 { 187 struct nfc_target *targets; 188 struct sk_buff *atqa_skb = NULL; 189 struct sk_buff *sak_skb = NULL; 190 struct sk_buff *uid_skb = NULL; 191 int r; 192 193 pr_debug("from gate %d\n", gate); 194 195 targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL); 196 if (targets == NULL) 197 return -ENOMEM; 198 199 switch (gate) { 200 case NFC_HCI_RF_READER_A_GATE: 201 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE, 202 NFC_HCI_RF_READER_A_ATQA, &atqa_skb); 203 if (r < 0) 204 goto exit; 205 206 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE, 207 NFC_HCI_RF_READER_A_SAK, &sak_skb); 208 if (r < 0) 209 goto exit; 210 211 if (atqa_skb->len != 2 || sak_skb->len != 1) { 212 r = -EPROTO; 213 goto exit; 214 } 215 216 targets->supported_protocols = 217 nfc_hci_sak_to_protocol(sak_skb->data[0]); 218 if (targets->supported_protocols == 0xffffffff) { 219 r = -EPROTO; 220 goto exit; 221 } 222 223 targets->sens_res = be16_to_cpu(*(u16 *)atqa_skb->data); 224 targets->sel_res = sak_skb->data[0]; 225 226 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE, 227 NFC_HCI_RF_READER_A_UID, &uid_skb); 228 if (r < 0) 229 goto exit; 230 231 if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) { 232 r = -EPROTO; 233 goto exit; 234 } 235 236 memcpy(targets->nfcid1, uid_skb->data, uid_skb->len); 237 targets->nfcid1_len = uid_skb->len; 238 239 if (hdev->ops->complete_target_discovered) { 240 r = hdev->ops->complete_target_discovered(hdev, gate, 241 targets); 242 if (r < 0) 243 goto exit; 244 } 245 break; 246 case NFC_HCI_RF_READER_B_GATE: 247 targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK; 248 break; 249 default: 250 if (hdev->ops->target_from_gate) 251 r = hdev->ops->target_from_gate(hdev, gate, targets); 252 else 253 r = -EPROTO; 254 if (r < 0) 255 goto exit; 256 257 if (hdev->ops->complete_target_discovered) { 258 r = hdev->ops->complete_target_discovered(hdev, gate, 259 targets); 260 if (r < 0) 261 goto exit; 262 } 263 break; 264 } 265 266 targets->hci_reader_gate = gate; 267 268 r = nfc_targets_found(hdev->ndev, targets, 1); 269 270 exit: 271 kfree(targets); 272 kfree_skb(atqa_skb); 273 kfree_skb(sak_skb); 274 kfree_skb(uid_skb); 275 276 return r; 277 } 278 279 void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event, 280 struct sk_buff *skb) 281 { 282 int r = 0; 283 284 switch (event) { 285 case NFC_HCI_EVT_TARGET_DISCOVERED: 286 if (skb->len < 1) { /* no status data? */ 287 r = -EPROTO; 288 goto exit; 289 } 290 291 if (skb->data[0] == 3) { 292 /* TODO: Multiple targets in field, none activated 293 * poll is supposedly stopped, but there is no 294 * single target to activate, so nothing to report 295 * up. 296 * if we need to restart poll, we must save the 297 * protocols from the initial poll and reuse here. 298 */ 299 } 300 301 if (skb->data[0] != 0) { 302 r = -EPROTO; 303 goto exit; 304 } 305 306 r = nfc_hci_target_discovered(hdev, 307 nfc_hci_pipe2gate(hdev, pipe)); 308 break; 309 default: 310 /* TODO: Unknown events are hardware specific 311 * pass them to the driver (needs a new hci_ops) */ 312 break; 313 } 314 315 exit: 316 kfree_skb(skb); 317 318 if (r) { 319 /* TODO: There was an error dispatching the event, 320 * how to propagate up to nfc core? 321 */ 322 } 323 } 324 325 static void nfc_hci_cmd_timeout(unsigned long data) 326 { 327 struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data; 328 329 schedule_work(&hdev->msg_tx_work); 330 } 331 332 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count, 333 struct nfc_hci_gate *gates) 334 { 335 int r; 336 while (gate_count--) { 337 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID, 338 gates->gate, gates->pipe); 339 if (r < 0) 340 return r; 341 gates++; 342 } 343 344 return 0; 345 } 346 347 static int hci_dev_session_init(struct nfc_hci_dev *hdev) 348 { 349 struct sk_buff *skb = NULL; 350 int r; 351 352 if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE) 353 return -EPROTO; 354 355 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID, 356 hdev->init_data.gates[0].gate, 357 hdev->init_data.gates[0].pipe); 358 if (r < 0) 359 goto exit; 360 361 r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE, 362 NFC_HCI_ADMIN_SESSION_IDENTITY, &skb); 363 if (r < 0) 364 goto disconnect_all; 365 366 if (skb->len && skb->len == strlen(hdev->init_data.session_id)) 367 if (memcmp(hdev->init_data.session_id, skb->data, 368 skb->len) == 0) { 369 /* TODO ELa: restore gate<->pipe table from 370 * some TBD location. 371 * note: it doesn't seem possible to get the chip 372 * currently open gate/pipe table. 373 * It is only possible to obtain the supported 374 * gate list. 375 */ 376 377 /* goto exit 378 * For now, always do a full initialization */ 379 } 380 381 r = nfc_hci_disconnect_all_gates(hdev); 382 if (r < 0) 383 goto exit; 384 385 r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count, 386 hdev->init_data.gates); 387 if (r < 0) 388 goto disconnect_all; 389 390 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE, 391 NFC_HCI_ADMIN_SESSION_IDENTITY, 392 hdev->init_data.session_id, 393 strlen(hdev->init_data.session_id)); 394 if (r == 0) 395 goto exit; 396 397 disconnect_all: 398 nfc_hci_disconnect_all_gates(hdev); 399 400 exit: 401 kfree_skb(skb); 402 403 return r; 404 } 405 406 static int hci_dev_version(struct nfc_hci_dev *hdev) 407 { 408 int r; 409 struct sk_buff *skb; 410 411 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE, 412 NFC_HCI_ID_MGMT_VERSION_SW, &skb); 413 if (r < 0) 414 return r; 415 416 if (skb->len != 3) { 417 kfree_skb(skb); 418 return -EINVAL; 419 } 420 421 hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4; 422 hdev->sw_patch = skb->data[0] & 0x0f; 423 hdev->sw_flashlib_major = skb->data[1]; 424 hdev->sw_flashlib_minor = skb->data[2]; 425 426 kfree_skb(skb); 427 428 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE, 429 NFC_HCI_ID_MGMT_VERSION_HW, &skb); 430 if (r < 0) 431 return r; 432 433 if (skb->len != 3) { 434 kfree_skb(skb); 435 return -EINVAL; 436 } 437 438 hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5; 439 hdev->hw_version = skb->data[0] & 0x1f; 440 hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6; 441 hdev->hw_software = skb->data[1] & 0x3f; 442 hdev->hw_bsid = skb->data[2]; 443 444 kfree_skb(skb); 445 446 pr_info("SOFTWARE INFO:\n"); 447 pr_info("RomLib : %d\n", hdev->sw_romlib); 448 pr_info("Patch : %d\n", hdev->sw_patch); 449 pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major); 450 pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor); 451 pr_info("HARDWARE INFO:\n"); 452 pr_info("Derivative : %d\n", hdev->hw_derivative); 453 pr_info("HW Version : %d\n", hdev->hw_version); 454 pr_info("#MPW : %d\n", hdev->hw_mpw); 455 pr_info("Software : %d\n", hdev->hw_software); 456 pr_info("BSID Version : %d\n", hdev->hw_bsid); 457 458 return 0; 459 } 460 461 static int hci_dev_up(struct nfc_dev *nfc_dev) 462 { 463 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 464 int r = 0; 465 466 if (hdev->ops->open) { 467 r = hdev->ops->open(hdev); 468 if (r < 0) 469 return r; 470 } 471 472 r = nfc_llc_start(hdev->llc); 473 if (r < 0) 474 goto exit_close; 475 476 r = hci_dev_session_init(hdev); 477 if (r < 0) 478 goto exit_llc; 479 480 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, 481 NFC_HCI_EVT_END_OPERATION, NULL, 0); 482 if (r < 0) 483 goto exit_llc; 484 485 if (hdev->ops->hci_ready) { 486 r = hdev->ops->hci_ready(hdev); 487 if (r < 0) 488 goto exit_llc; 489 } 490 491 r = hci_dev_version(hdev); 492 if (r < 0) 493 goto exit_llc; 494 495 return 0; 496 497 exit_llc: 498 nfc_llc_stop(hdev->llc); 499 500 exit_close: 501 if (hdev->ops->close) 502 hdev->ops->close(hdev); 503 504 return r; 505 } 506 507 static int hci_dev_down(struct nfc_dev *nfc_dev) 508 { 509 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 510 511 nfc_llc_stop(hdev->llc); 512 513 if (hdev->ops->close) 514 hdev->ops->close(hdev); 515 516 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe)); 517 518 return 0; 519 } 520 521 static int hci_start_poll(struct nfc_dev *nfc_dev, 522 u32 im_protocols, u32 tm_protocols) 523 { 524 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 525 526 if (hdev->ops->start_poll) 527 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols); 528 else 529 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, 530 NFC_HCI_EVT_READER_REQUESTED, NULL, 0); 531 } 532 533 static void hci_stop_poll(struct nfc_dev *nfc_dev) 534 { 535 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 536 537 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, 538 NFC_HCI_EVT_END_OPERATION, NULL, 0); 539 } 540 541 static int hci_activate_target(struct nfc_dev *nfc_dev, 542 struct nfc_target *target, u32 protocol) 543 { 544 return 0; 545 } 546 547 static void hci_deactivate_target(struct nfc_dev *nfc_dev, 548 struct nfc_target *target) 549 { 550 } 551 552 #define HCI_CB_TYPE_TRANSCEIVE 1 553 554 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err) 555 { 556 struct nfc_hci_dev *hdev = context; 557 558 switch (hdev->async_cb_type) { 559 case HCI_CB_TYPE_TRANSCEIVE: 560 /* 561 * TODO: Check RF Error indicator to make sure data is valid. 562 * It seems that HCI cmd can complete without error, but data 563 * can be invalid if an RF error occured? Ignore for now. 564 */ 565 if (err == 0) 566 skb_trim(skb, skb->len - 1); /* RF Err ind */ 567 568 hdev->async_cb(hdev->async_cb_context, skb, err); 569 break; 570 default: 571 if (err == 0) 572 kfree_skb(skb); 573 break; 574 } 575 } 576 577 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target, 578 struct sk_buff *skb, data_exchange_cb_t cb, 579 void *cb_context) 580 { 581 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 582 int r; 583 584 pr_debug("target_idx=%d\n", target->idx); 585 586 switch (target->hci_reader_gate) { 587 case NFC_HCI_RF_READER_A_GATE: 588 case NFC_HCI_RF_READER_B_GATE: 589 if (hdev->ops->data_exchange) { 590 r = hdev->ops->data_exchange(hdev, target, skb, cb, 591 cb_context); 592 if (r <= 0) /* handled */ 593 break; 594 } 595 596 *skb_push(skb, 1) = 0; /* CTR, see spec:10.2.2.1 */ 597 598 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE; 599 hdev->async_cb = cb; 600 hdev->async_cb_context = cb_context; 601 602 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate, 603 NFC_HCI_WR_XCHG_DATA, skb->data, 604 skb->len, hci_transceive_cb, hdev); 605 break; 606 default: 607 if (hdev->ops->data_exchange) { 608 r = hdev->ops->data_exchange(hdev, target, skb, cb, 609 cb_context); 610 if (r == 1) 611 r = -ENOTSUPP; 612 } 613 else 614 r = -ENOTSUPP; 615 break; 616 } 617 618 kfree_skb(skb); 619 620 return r; 621 } 622 623 static int hci_check_presence(struct nfc_dev *nfc_dev, 624 struct nfc_target *target) 625 { 626 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 627 628 if (hdev->ops->check_presence) 629 return hdev->ops->check_presence(hdev, target); 630 631 return 0; 632 } 633 634 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err) 635 { 636 mutex_lock(&hdev->msg_tx_mutex); 637 638 if (hdev->cmd_pending_msg == NULL) { 639 nfc_driver_failure(hdev->ndev, err); 640 goto exit; 641 } 642 643 __nfc_hci_cmd_completion(hdev, err, NULL); 644 645 exit: 646 mutex_unlock(&hdev->msg_tx_mutex); 647 } 648 649 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err) 650 { 651 nfc_hci_failure(hdev, err); 652 } 653 654 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb) 655 { 656 struct hcp_packet *packet; 657 u8 type; 658 u8 instruction; 659 struct sk_buff *hcp_skb; 660 u8 pipe; 661 struct sk_buff *frag_skb; 662 int msg_len; 663 664 packet = (struct hcp_packet *)skb->data; 665 if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) { 666 skb_queue_tail(&hdev->rx_hcp_frags, skb); 667 return; 668 } 669 670 /* it's the last fragment. Does it need re-aggregation? */ 671 if (skb_queue_len(&hdev->rx_hcp_frags)) { 672 pipe = packet->header & NFC_HCI_FRAGMENT; 673 skb_queue_tail(&hdev->rx_hcp_frags, skb); 674 675 msg_len = 0; 676 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) { 677 msg_len += (frag_skb->len - 678 NFC_HCI_HCP_PACKET_HEADER_LEN); 679 } 680 681 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN + 682 msg_len, GFP_KERNEL); 683 if (hcp_skb == NULL) { 684 nfc_hci_failure(hdev, -ENOMEM); 685 return; 686 } 687 688 *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe; 689 690 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) { 691 msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN; 692 memcpy(skb_put(hcp_skb, msg_len), 693 frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN, 694 msg_len); 695 } 696 697 skb_queue_purge(&hdev->rx_hcp_frags); 698 } else { 699 packet->header &= NFC_HCI_FRAGMENT; 700 hcp_skb = skb; 701 } 702 703 /* if this is a response, dispatch immediately to 704 * unblock waiting cmd context. Otherwise, enqueue to dispatch 705 * in separate context where handler can also execute command. 706 */ 707 packet = (struct hcp_packet *)hcp_skb->data; 708 type = HCP_MSG_GET_TYPE(packet->message.header); 709 if (type == NFC_HCI_HCP_RESPONSE) { 710 pipe = packet->header; 711 instruction = HCP_MSG_GET_CMD(packet->message.header); 712 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN + 713 NFC_HCI_HCP_MESSAGE_HEADER_LEN); 714 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb); 715 } else { 716 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb); 717 schedule_work(&hdev->msg_rx_work); 718 } 719 } 720 721 static struct nfc_ops hci_nfc_ops = { 722 .dev_up = hci_dev_up, 723 .dev_down = hci_dev_down, 724 .start_poll = hci_start_poll, 725 .stop_poll = hci_stop_poll, 726 .activate_target = hci_activate_target, 727 .deactivate_target = hci_deactivate_target, 728 .im_transceive = hci_transceive, 729 .check_presence = hci_check_presence, 730 }; 731 732 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops, 733 struct nfc_hci_init_data *init_data, 734 u32 protocols, 735 const char *llc_name, 736 int tx_headroom, 737 int tx_tailroom, 738 int max_link_payload) 739 { 740 struct nfc_hci_dev *hdev; 741 742 if (ops->xmit == NULL) 743 return NULL; 744 745 if (protocols == 0) 746 return NULL; 747 748 hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL); 749 if (hdev == NULL) 750 return NULL; 751 752 hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit, 753 nfc_hci_recv_from_llc, tx_headroom, 754 tx_tailroom, nfc_hci_llc_failure); 755 if (hdev->llc == NULL) { 756 kfree(hdev); 757 return NULL; 758 } 759 760 hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols, 761 tx_headroom + HCI_CMDS_HEADROOM, 762 tx_tailroom); 763 if (!hdev->ndev) { 764 nfc_llc_free(hdev->llc); 765 kfree(hdev); 766 return NULL; 767 } 768 769 hdev->ops = ops; 770 hdev->max_data_link_payload = max_link_payload; 771 hdev->init_data = *init_data; 772 773 nfc_set_drvdata(hdev->ndev, hdev); 774 775 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe)); 776 777 return hdev; 778 } 779 EXPORT_SYMBOL(nfc_hci_allocate_device); 780 781 void nfc_hci_free_device(struct nfc_hci_dev *hdev) 782 { 783 nfc_free_device(hdev->ndev); 784 nfc_llc_free(hdev->llc); 785 kfree(hdev); 786 } 787 EXPORT_SYMBOL(nfc_hci_free_device); 788 789 int nfc_hci_register_device(struct nfc_hci_dev *hdev) 790 { 791 mutex_init(&hdev->msg_tx_mutex); 792 793 INIT_LIST_HEAD(&hdev->msg_tx_queue); 794 795 INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work); 796 797 init_timer(&hdev->cmd_timer); 798 hdev->cmd_timer.data = (unsigned long)hdev; 799 hdev->cmd_timer.function = nfc_hci_cmd_timeout; 800 801 skb_queue_head_init(&hdev->rx_hcp_frags); 802 803 INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work); 804 805 skb_queue_head_init(&hdev->msg_rx_queue); 806 807 return nfc_register_device(hdev->ndev); 808 } 809 EXPORT_SYMBOL(nfc_hci_register_device); 810 811 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev) 812 { 813 struct hci_msg *msg, *n; 814 815 skb_queue_purge(&hdev->rx_hcp_frags); 816 skb_queue_purge(&hdev->msg_rx_queue); 817 818 list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) { 819 list_del(&msg->msg_l); 820 skb_queue_purge(&msg->msg_frags); 821 kfree(msg); 822 } 823 824 del_timer_sync(&hdev->cmd_timer); 825 826 nfc_unregister_device(hdev->ndev); 827 828 cancel_work_sync(&hdev->msg_tx_work); 829 cancel_work_sync(&hdev->msg_rx_work); 830 } 831 EXPORT_SYMBOL(nfc_hci_unregister_device); 832 833 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata) 834 { 835 hdev->clientdata = clientdata; 836 } 837 EXPORT_SYMBOL(nfc_hci_set_clientdata); 838 839 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev) 840 { 841 return hdev->clientdata; 842 } 843 EXPORT_SYMBOL(nfc_hci_get_clientdata); 844 845 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err) 846 { 847 nfc_hci_failure(hdev, err); 848 } 849 EXPORT_SYMBOL(nfc_hci_driver_failure); 850 851 void inline nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb) 852 { 853 nfc_llc_rcv_from_drv(hdev->llc, skb); 854 } 855 EXPORT_SYMBOL(nfc_hci_recv_frame); 856 857 static int __init nfc_hci_init(void) 858 { 859 return nfc_llc_init(); 860 } 861 862 static void __exit nfc_hci_exit(void) 863 { 864 nfc_llc_exit(); 865 } 866 867 subsys_initcall(nfc_hci_init); 868 module_exit(nfc_hci_exit); 869 870 MODULE_LICENSE("GPL"); 871 MODULE_DESCRIPTION("NFC HCI Core"); 872