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 30 #include "hci.h" 31 32 /* Largest headroom needed for outgoing HCI commands */ 33 #define HCI_CMDS_HEADROOM 1 34 35 static int nfc_hci_result_to_errno(u8 result) 36 { 37 switch (result) { 38 case NFC_HCI_ANY_OK: 39 return 0; 40 case NFC_HCI_ANY_E_TIMEOUT: 41 return -ETIME; 42 default: 43 return -1; 44 } 45 } 46 47 static void nfc_hci_msg_tx_work(struct work_struct *work) 48 { 49 struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev, 50 msg_tx_work); 51 struct hci_msg *msg; 52 struct sk_buff *skb; 53 int r = 0; 54 55 mutex_lock(&hdev->msg_tx_mutex); 56 57 if (hdev->cmd_pending_msg) { 58 if (timer_pending(&hdev->cmd_timer) == 0) { 59 if (hdev->cmd_pending_msg->cb) 60 hdev->cmd_pending_msg->cb(hdev, 61 -ETIME, 62 NULL, 63 hdev-> 64 cmd_pending_msg-> 65 cb_context); 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 = hdev->ops->xmit(hdev, skb); 82 if (r < 0) { 83 kfree_skb(skb); 84 skb_queue_purge(&msg->msg_frags); 85 if (msg->cb) 86 msg->cb(hdev, r, NULL, msg->cb_context); 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, err, skb, 137 hdev->cmd_pending_msg->cb_context); 138 else 139 kfree_skb(skb); 140 141 kfree(hdev->cmd_pending_msg); 142 hdev->cmd_pending_msg = NULL; 143 144 queue_work(hdev->msg_tx_wq, &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 queue_work(hdev->msg_tx_wq, &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 if (skb) 402 kfree_skb(skb); 403 404 return r; 405 } 406 407 static int hci_dev_version(struct nfc_hci_dev *hdev) 408 { 409 int r; 410 struct sk_buff *skb; 411 412 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE, 413 NFC_HCI_ID_MGMT_VERSION_SW, &skb); 414 if (r < 0) 415 return r; 416 417 if (skb->len != 3) { 418 kfree_skb(skb); 419 return -EINVAL; 420 } 421 422 hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4; 423 hdev->sw_patch = skb->data[0] & 0x0f; 424 hdev->sw_flashlib_major = skb->data[1]; 425 hdev->sw_flashlib_minor = skb->data[2]; 426 427 kfree_skb(skb); 428 429 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE, 430 NFC_HCI_ID_MGMT_VERSION_HW, &skb); 431 if (r < 0) 432 return r; 433 434 if (skb->len != 3) { 435 kfree_skb(skb); 436 return -EINVAL; 437 } 438 439 hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5; 440 hdev->hw_version = skb->data[0] & 0x1f; 441 hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6; 442 hdev->hw_software = skb->data[1] & 0x3f; 443 hdev->hw_bsid = skb->data[2]; 444 445 kfree_skb(skb); 446 447 pr_info("SOFTWARE INFO:\n"); 448 pr_info("RomLib : %d\n", hdev->sw_romlib); 449 pr_info("Patch : %d\n", hdev->sw_patch); 450 pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major); 451 pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor); 452 pr_info("HARDWARE INFO:\n"); 453 pr_info("Derivative : %d\n", hdev->hw_derivative); 454 pr_info("HW Version : %d\n", hdev->hw_version); 455 pr_info("#MPW : %d\n", hdev->hw_mpw); 456 pr_info("Software : %d\n", hdev->hw_software); 457 pr_info("BSID Version : %d\n", hdev->hw_bsid); 458 459 return 0; 460 } 461 462 static int hci_dev_up(struct nfc_dev *nfc_dev) 463 { 464 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 465 int r = 0; 466 467 if (hdev->ops->open) { 468 r = hdev->ops->open(hdev); 469 if (r < 0) 470 return r; 471 } 472 473 r = hci_dev_session_init(hdev); 474 if (r < 0) 475 goto exit; 476 477 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, 478 NFC_HCI_EVT_END_OPERATION, NULL, 0); 479 if (r < 0) 480 goto exit; 481 482 if (hdev->ops->hci_ready) { 483 r = hdev->ops->hci_ready(hdev); 484 if (r < 0) 485 goto exit; 486 } 487 488 r = hci_dev_version(hdev); 489 if (r < 0) 490 goto exit; 491 492 exit: 493 if (r < 0) 494 if (hdev->ops->close) 495 hdev->ops->close(hdev); 496 return r; 497 } 498 499 static int hci_dev_down(struct nfc_dev *nfc_dev) 500 { 501 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 502 503 if (hdev->ops->close) 504 hdev->ops->close(hdev); 505 506 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe)); 507 508 return 0; 509 } 510 511 static int hci_start_poll(struct nfc_dev *nfc_dev, 512 u32 im_protocols, u32 tm_protocols) 513 { 514 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 515 516 if (hdev->ops->start_poll) 517 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols); 518 else 519 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, 520 NFC_HCI_EVT_READER_REQUESTED, NULL, 0); 521 } 522 523 static void hci_stop_poll(struct nfc_dev *nfc_dev) 524 { 525 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 526 527 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, 528 NFC_HCI_EVT_END_OPERATION, NULL, 0); 529 } 530 531 static int hci_activate_target(struct nfc_dev *nfc_dev, 532 struct nfc_target *target, u32 protocol) 533 { 534 return 0; 535 } 536 537 static void hci_deactivate_target(struct nfc_dev *nfc_dev, 538 struct nfc_target *target) 539 { 540 } 541 542 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target, 543 struct sk_buff *skb, data_exchange_cb_t cb, 544 void *cb_context) 545 { 546 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 547 int r; 548 struct sk_buff *res_skb = NULL; 549 550 pr_debug("target_idx=%d\n", target->idx); 551 552 switch (target->hci_reader_gate) { 553 case NFC_HCI_RF_READER_A_GATE: 554 case NFC_HCI_RF_READER_B_GATE: 555 if (hdev->ops->data_exchange) { 556 r = hdev->ops->data_exchange(hdev, target, skb, 557 &res_skb); 558 if (r <= 0) /* handled */ 559 break; 560 } 561 562 *skb_push(skb, 1) = 0; /* CTR, see spec:10.2.2.1 */ 563 r = nfc_hci_send_cmd(hdev, target->hci_reader_gate, 564 NFC_HCI_WR_XCHG_DATA, 565 skb->data, skb->len, &res_skb); 566 /* 567 * TODO: Check RF Error indicator to make sure data is valid. 568 * It seems that HCI cmd can complete without error, but data 569 * can be invalid if an RF error occured? Ignore for now. 570 */ 571 if (r == 0) 572 skb_trim(res_skb, res_skb->len - 1); /* RF Err ind */ 573 break; 574 default: 575 if (hdev->ops->data_exchange) { 576 r = hdev->ops->data_exchange(hdev, target, skb, 577 &res_skb); 578 if (r == 1) 579 r = -ENOTSUPP; 580 } 581 else 582 r = -ENOTSUPP; 583 } 584 585 kfree_skb(skb); 586 587 cb(cb_context, res_skb, r); 588 589 return 0; 590 } 591 592 static int hci_check_presence(struct nfc_dev *nfc_dev, 593 struct nfc_target *target) 594 { 595 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); 596 597 if (hdev->ops->check_presence) 598 return hdev->ops->check_presence(hdev, target); 599 600 return 0; 601 } 602 603 static struct nfc_ops hci_nfc_ops = { 604 .dev_up = hci_dev_up, 605 .dev_down = hci_dev_down, 606 .start_poll = hci_start_poll, 607 .stop_poll = hci_stop_poll, 608 .activate_target = hci_activate_target, 609 .deactivate_target = hci_deactivate_target, 610 .im_transceive = hci_transceive, 611 .check_presence = hci_check_presence, 612 }; 613 614 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops, 615 struct nfc_hci_init_data *init_data, 616 u32 protocols, 617 int tx_headroom, 618 int tx_tailroom, 619 int max_link_payload) 620 { 621 struct nfc_hci_dev *hdev; 622 623 if (ops->xmit == NULL) 624 return NULL; 625 626 if (protocols == 0) 627 return NULL; 628 629 hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL); 630 if (hdev == NULL) 631 return NULL; 632 633 hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols, 634 tx_headroom + HCI_CMDS_HEADROOM, 635 tx_tailroom); 636 if (!hdev->ndev) { 637 kfree(hdev); 638 return NULL; 639 } 640 641 hdev->ops = ops; 642 hdev->max_data_link_payload = max_link_payload; 643 hdev->init_data = *init_data; 644 645 nfc_set_drvdata(hdev->ndev, hdev); 646 647 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe)); 648 649 return hdev; 650 } 651 EXPORT_SYMBOL(nfc_hci_allocate_device); 652 653 void nfc_hci_free_device(struct nfc_hci_dev *hdev) 654 { 655 nfc_free_device(hdev->ndev); 656 kfree(hdev); 657 } 658 EXPORT_SYMBOL(nfc_hci_free_device); 659 660 int nfc_hci_register_device(struct nfc_hci_dev *hdev) 661 { 662 struct device *dev = &hdev->ndev->dev; 663 const char *devname = dev_name(dev); 664 char name[32]; 665 int r = 0; 666 667 mutex_init(&hdev->msg_tx_mutex); 668 669 INIT_LIST_HEAD(&hdev->msg_tx_queue); 670 671 INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work); 672 snprintf(name, sizeof(name), "%s_hci_msg_tx_wq", devname); 673 hdev->msg_tx_wq = alloc_workqueue(name, WQ_NON_REENTRANT | WQ_UNBOUND | 674 WQ_MEM_RECLAIM, 1); 675 if (hdev->msg_tx_wq == NULL) { 676 r = -ENOMEM; 677 goto exit; 678 } 679 680 init_timer(&hdev->cmd_timer); 681 hdev->cmd_timer.data = (unsigned long)hdev; 682 hdev->cmd_timer.function = nfc_hci_cmd_timeout; 683 684 skb_queue_head_init(&hdev->rx_hcp_frags); 685 686 INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work); 687 snprintf(name, sizeof(name), "%s_hci_msg_rx_wq", devname); 688 hdev->msg_rx_wq = alloc_workqueue(name, WQ_NON_REENTRANT | WQ_UNBOUND | 689 WQ_MEM_RECLAIM, 1); 690 if (hdev->msg_rx_wq == NULL) { 691 r = -ENOMEM; 692 goto exit; 693 } 694 695 skb_queue_head_init(&hdev->msg_rx_queue); 696 697 r = nfc_register_device(hdev->ndev); 698 699 exit: 700 if (r < 0) { 701 if (hdev->msg_tx_wq) 702 destroy_workqueue(hdev->msg_tx_wq); 703 if (hdev->msg_rx_wq) 704 destroy_workqueue(hdev->msg_rx_wq); 705 } 706 707 return r; 708 } 709 EXPORT_SYMBOL(nfc_hci_register_device); 710 711 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev) 712 { 713 struct hci_msg *msg, *n; 714 715 skb_queue_purge(&hdev->rx_hcp_frags); 716 skb_queue_purge(&hdev->msg_rx_queue); 717 718 list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) { 719 list_del(&msg->msg_l); 720 skb_queue_purge(&msg->msg_frags); 721 kfree(msg); 722 } 723 724 del_timer_sync(&hdev->cmd_timer); 725 726 nfc_unregister_device(hdev->ndev); 727 728 destroy_workqueue(hdev->msg_tx_wq); 729 730 destroy_workqueue(hdev->msg_rx_wq); 731 } 732 EXPORT_SYMBOL(nfc_hci_unregister_device); 733 734 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata) 735 { 736 hdev->clientdata = clientdata; 737 } 738 EXPORT_SYMBOL(nfc_hci_set_clientdata); 739 740 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev) 741 { 742 return hdev->clientdata; 743 } 744 EXPORT_SYMBOL(nfc_hci_get_clientdata); 745 746 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err) 747 { 748 mutex_lock(&hdev->msg_tx_mutex); 749 750 if (hdev->cmd_pending_msg == NULL) { 751 nfc_driver_failure(hdev->ndev, err); 752 goto exit; 753 } 754 755 __nfc_hci_cmd_completion(hdev, err, NULL); 756 757 exit: 758 mutex_unlock(&hdev->msg_tx_mutex); 759 } 760 761 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err) 762 { 763 nfc_hci_failure(hdev, err); 764 } 765 EXPORT_SYMBOL(nfc_hci_driver_failure); 766 767 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb) 768 { 769 struct hcp_packet *packet; 770 u8 type; 771 u8 instruction; 772 struct sk_buff *hcp_skb; 773 u8 pipe; 774 struct sk_buff *frag_skb; 775 int msg_len; 776 777 packet = (struct hcp_packet *)skb->data; 778 if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) { 779 skb_queue_tail(&hdev->rx_hcp_frags, skb); 780 return; 781 } 782 783 /* it's the last fragment. Does it need re-aggregation? */ 784 if (skb_queue_len(&hdev->rx_hcp_frags)) { 785 pipe = packet->header & NFC_HCI_FRAGMENT; 786 skb_queue_tail(&hdev->rx_hcp_frags, skb); 787 788 msg_len = 0; 789 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) { 790 msg_len += (frag_skb->len - 791 NFC_HCI_HCP_PACKET_HEADER_LEN); 792 } 793 794 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN + 795 msg_len, GFP_KERNEL); 796 if (hcp_skb == NULL) { 797 nfc_hci_failure(hdev, -ENOMEM); 798 return; 799 } 800 801 *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe; 802 803 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) { 804 msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN; 805 memcpy(skb_put(hcp_skb, msg_len), 806 frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN, 807 msg_len); 808 } 809 810 skb_queue_purge(&hdev->rx_hcp_frags); 811 } else { 812 packet->header &= NFC_HCI_FRAGMENT; 813 hcp_skb = skb; 814 } 815 816 /* if this is a response, dispatch immediately to 817 * unblock waiting cmd context. Otherwise, enqueue to dispatch 818 * in separate context where handler can also execute command. 819 */ 820 packet = (struct hcp_packet *)hcp_skb->data; 821 type = HCP_MSG_GET_TYPE(packet->message.header); 822 if (type == NFC_HCI_HCP_RESPONSE) { 823 pipe = packet->header; 824 instruction = HCP_MSG_GET_CMD(packet->message.header); 825 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN + 826 NFC_HCI_HCP_MESSAGE_HEADER_LEN); 827 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb); 828 } else { 829 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb); 830 queue_work(hdev->msg_rx_wq, &hdev->msg_rx_work); 831 } 832 } 833 EXPORT_SYMBOL(nfc_hci_recv_frame); 834 835 MODULE_LICENSE("GPL"); 836