1 /* 2 * Copyright (C) 2009 by Matthias Ringwald 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY MATTHIAS RINGWALD AND CONTRIBUTORS 18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 20 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 21 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 23 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 24 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 25 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 27 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 */ 31 32 /* 33 * hci.c 34 * 35 * Created by Matthias Ringwald on 4/29/09. 36 * 37 */ 38 39 #include "hci.h" 40 41 #include <unistd.h> 42 #include <stdarg.h> 43 #include <string.h> 44 #include <stdio.h> 45 46 #include "debug.h" 47 #include "hci_dump.h" 48 49 #include "../include/btstack/hci_cmds.h" 50 #include "../include/btstack/version.h" 51 52 // temp 53 #include "l2cap.h" 54 55 #define HCI_CONNECTION_TIMEOUT_MS 10000 56 57 // the STACK is here 58 static hci_stack_t hci_stack; 59 60 /** 61 * get connection for a given handle 62 * 63 * @return connection OR NULL, if not found 64 */ 65 hci_connection_t * connection_for_handle(hci_con_handle_t con_handle){ 66 linked_item_t *it; 67 for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next){ 68 if ( ((hci_connection_t *) it)->con_handle == con_handle){ 69 return (hci_connection_t *) it; 70 } 71 } 72 return NULL; 73 } 74 75 static void hci_connection_timeout_handler(timer_source_t *timer){ 76 hci_connection_t * connection = linked_item_get_user(&timer->item); 77 struct timeval tv; 78 gettimeofday(&tv, NULL); 79 if (tv.tv_sec >= connection->timestamp.tv_sec + HCI_CONNECTION_TIMEOUT_MS/1000) { 80 // connections might be timed out 81 hci_emit_l2cap_check_timeout(connection); 82 run_loop_set_timer(timer, HCI_CONNECTION_TIMEOUT_MS); 83 } else { 84 // next timeout check at 85 timer->timeout.tv_sec = connection->timestamp.tv_sec + HCI_CONNECTION_TIMEOUT_MS/1000; 86 } 87 run_loop_add_timer(timer); 88 } 89 90 static void hci_connection_timestamp(hci_connection_t *connection){ 91 gettimeofday(&connection->timestamp, NULL); 92 } 93 94 /** 95 * create connection for given address 96 * 97 * @return connection OR NULL, if not found 98 */ 99 static hci_connection_t * create_connection_for_addr(bd_addr_t addr){ 100 hci_connection_t * conn = malloc( sizeof(hci_connection_t) ); 101 if (!conn) return NULL; 102 BD_ADDR_COPY(conn->address, addr); 103 conn->con_handle = 0xffff; 104 conn->authentication_flags = 0; 105 linked_item_set_user(&conn->timeout.item, conn); 106 conn->timeout.process = hci_connection_timeout_handler; 107 hci_connection_timestamp(conn); 108 conn->acl_recombination_length = 0; 109 conn->acl_recombination_pos = 0; 110 conn->num_acl_packets_sent = 0; 111 linked_list_add(&hci_stack.connections, (linked_item_t *) conn); 112 return conn; 113 } 114 115 /** 116 * get connection for given address 117 * 118 * @return connection OR NULL, if not found 119 */ 120 static hci_connection_t * connection_for_address(bd_addr_t address){ 121 linked_item_t *it; 122 for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next){ 123 if ( ! BD_ADDR_CMP( ((hci_connection_t *) it)->address, address) ){ 124 return (hci_connection_t *) it; 125 } 126 } 127 return NULL; 128 } 129 130 /** 131 * add authentication flags and reset timer 132 */ 133 static void hci_add_connection_flags_for_flipped_bd_addr(uint8_t *bd_addr, hci_authentication_flags_t flags){ 134 bd_addr_t addr; 135 bt_flip_addr(addr, *(bd_addr_t *) bd_addr); 136 hci_connection_t * conn = connection_for_address(addr); 137 if (conn) { 138 conn->authentication_flags |= flags; 139 hci_connection_timestamp(conn); 140 } 141 } 142 143 int hci_authentication_active_for_handle(hci_con_handle_t handle){ 144 hci_connection_t * conn = connection_for_handle(handle); 145 if (!conn) return 0; 146 if (!conn->authentication_flags) return 0; 147 if (conn->authentication_flags & SENT_LINK_KEY_REPLY) return 0; 148 if (conn->authentication_flags & RECV_LINK_KEY_NOTIFICATION) return 0; 149 return 1; 150 } 151 152 void hci_drop_link_key_for_bd_addr(bd_addr_t *addr){ 153 if (hci_stack.remote_device_db) { 154 hci_stack.remote_device_db->delete_link_key(addr); 155 } 156 } 157 158 159 /** 160 * count connections 161 */ 162 static int nr_hci_connections(){ 163 int count = 0; 164 linked_item_t *it; 165 for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next, count++); 166 return count; 167 } 168 169 /** 170 * Dummy handler called by HCI 171 */ 172 static void dummy_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 173 } 174 175 uint8_t hci_number_outgoing_packets(hci_con_handle_t handle){ 176 hci_connection_t * connection = connection_for_handle(handle); 177 if (!connection) { 178 log_err("hci_number_outgoing_packets connectino for handle %u does not exist!\n", handle); 179 return 0; 180 } 181 return connection->num_acl_packets_sent; 182 } 183 184 uint8_t hci_number_free_acl_slots(){ 185 uint8_t free_slots = hci_stack.total_num_acl_packets; 186 linked_item_t *it; 187 for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next){ 188 hci_connection_t * connection = (hci_connection_t *) it; 189 if (free_slots < connection->num_acl_packets_sent) { 190 log_err("hci_number_free_acl_slots: sum of outgoing packets > total acl packets!\n"); 191 return 0; 192 } 193 free_slots -= connection->num_acl_packets_sent; 194 } 195 return free_slots; 196 } 197 198 uint16_t hci_max_acl_data_packet_length(){ 199 return hci_stack.acl_data_packet_length; 200 } 201 202 int hci_ready_to_send(hci_con_handle_t handle){ 203 return hci_number_free_acl_slots() && hci_number_outgoing_packets(handle) < 2; 204 } 205 206 int hci_send_acl_packet(uint8_t *packet, int size){ 207 208 // check for free places on BT module 209 if (!hci_number_free_acl_slots()) return -1; 210 211 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 212 hci_connection_t *connection = connection_for_handle( con_handle); 213 if (!connection) return 0; 214 hci_connection_timestamp(connection); 215 216 // count packet 217 connection->num_acl_packets_sent++; 218 // log_dbg("hci_send_acl_packet - handle %u, sent %u\n", connection->con_handle, connection->num_acl_packets_sent); 219 220 // send packet - ignore errors 221 hci_stack.hci_transport->send_packet(HCI_ACL_DATA_PACKET, packet, size); 222 223 return 0; 224 } 225 226 static void acl_handler(uint8_t *packet, int size){ 227 228 // get info 229 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 230 hci_connection_t *conn = connection_for_handle(con_handle); 231 uint8_t acl_flags = READ_ACL_FLAGS(packet); 232 uint16_t acl_length = READ_ACL_LENGTH(packet); 233 234 // ignore non-registered handle 235 if (!conn){ 236 log_err( "hci.c: acl_handler called with non-registered handle %u!\n" , con_handle); 237 return; 238 } 239 240 // update idle timestamp 241 hci_connection_timestamp(conn); 242 243 // handle different packet types 244 switch (acl_flags & 0x03) { 245 246 case 0x01: // continuation fragment 247 248 // sanity check 249 if (conn->acl_recombination_pos == 0) { 250 log_err( "ACL Cont Fragment but no first fragment for handle 0x%02x\n", con_handle); 251 return; 252 } 253 254 // append fragment payload (header already stored) 255 memcpy(&conn->acl_recombination_buffer[conn->acl_recombination_pos], &packet[4], acl_length ); 256 conn->acl_recombination_pos += acl_length; 257 258 // log_err( "ACL Cont Fragment: acl_len %u, combined_len %u, l2cap_len %u\n", 259 // acl_length, connection->acl_recombination_pos, connection->acl_recombination_length); 260 261 // forward complete L2CAP packet if complete. 262 if (conn->acl_recombination_pos >= conn->acl_recombination_length + 4 + 4){ // pos already incl. ACL header 263 264 hci_stack.packet_handler(HCI_ACL_DATA_PACKET, conn->acl_recombination_buffer, conn->acl_recombination_pos); 265 // reset recombination buffer 266 conn->acl_recombination_length = 0; 267 conn->acl_recombination_pos = 0; 268 } 269 break; 270 271 case 0x02: { // first fragment 272 273 // sanity check 274 if (conn->acl_recombination_pos) { 275 log_err( "ACL First Fragment but data in buffer for handle 0x%02x\n", con_handle); 276 return; 277 } 278 279 // peek into L2CAP packet! 280 uint16_t l2cap_length = READ_L2CAP_LENGTH( packet ); 281 282 // compare fragment size to L2CAP packet size 283 if (acl_length >= l2cap_length + 4){ 284 285 // forward fragment as L2CAP packet 286 hci_stack.packet_handler(HCI_ACL_DATA_PACKET, packet, acl_length + 4); 287 288 } else { 289 // store first fragment and tweak acl length for complete package 290 memcpy(conn->acl_recombination_buffer, packet, acl_length + 4); 291 conn->acl_recombination_pos = acl_length + 4; 292 conn->acl_recombination_length = l2cap_length; 293 bt_store_16(conn->acl_recombination_buffer, 2, acl_length +4); 294 // log_err( "ACL First Fragment: acl_len %u, l2cap_len %u\n", acl_length, l2cap_length); 295 } 296 break; 297 298 } 299 default: 300 log_err( "hci.c: acl_handler called with invalid packet boundary flags %u\n", acl_flags & 0x03); 301 return; 302 } 303 304 // execute main loop 305 hci_run(); 306 } 307 308 static void hci_shutdown_connection(hci_connection_t *conn){ 309 log_dbg("Connection closed: handle %u, ", conn->con_handle); 310 print_bd_addr( conn->address ); 311 log_dbg("\n"); 312 run_loop_remove_timer(&conn->timeout); 313 linked_list_remove(&hci_stack.connections, (linked_item_t *) conn); 314 free( conn ); 315 hci_emit_nr_connections_changed(); 316 } 317 318 // avoid huge local variables 319 static device_name_t device_name; 320 static void event_handler(uint8_t *packet, int size){ 321 bd_addr_t addr; 322 hci_con_handle_t handle; 323 hci_connection_t * conn; 324 int i; 325 link_key_t link_key; 326 327 // get num_cmd_packets 328 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE || packet[0] == HCI_EVENT_COMMAND_STATUS){ 329 // Get Num_HCI_Command_Packets 330 hci_stack.num_cmd_packets = packet[2]; 331 } 332 333 switch (packet[0]) { 334 335 case HCI_EVENT_COMMAND_COMPLETE: 336 if (COMMAND_COMPLETE_EVENT(packet, hci_read_buffer_size)){ 337 // from offset 5 338 // status 339 hci_stack.acl_data_packet_length = READ_BT_16(packet, 6); 340 // ignore: SCO data packet len (8) 341 hci_stack.total_num_acl_packets = packet[9]; 342 // ignore: total num SCO packets 343 if (hci_stack.state == HCI_STATE_INITIALIZING){ 344 log_dbg("hci_read_buffer_size: size %u, count %u\n", hci_stack.acl_data_packet_length, hci_stack.total_num_acl_packets); 345 } 346 } 347 if (COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 348 hci_emit_discoverable_enabled(hci_stack.discoverable); 349 } 350 break; 351 352 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS: 353 for (i=0; i<packet[2];i++){ 354 handle = READ_BT_16(packet, 3 + 2*i); 355 uint16_t num_packets = READ_BT_16(packet, 3 + packet[2]*2 + 2*i); 356 conn = connection_for_handle(handle); 357 if (!conn){ 358 log_err("hci_number_completed_packet lists unused con handle %u\n", handle); 359 continue; 360 } 361 conn->num_acl_packets_sent -= num_packets; 362 // log_dbg("hci_number_completed_packet %u processed for handle %u, outstanding %u\n", num_packets, handle, conn->num_acl_packets_sent); 363 } 364 break; 365 366 case HCI_EVENT_CONNECTION_REQUEST: 367 bt_flip_addr(addr, &packet[2]); 368 // TODO: eval COD 8-10 369 uint8_t link_type = packet[11]; 370 log_dbg("Connection_incoming: "); print_bd_addr(addr); log_dbg(", type %u\n", link_type); 371 if (link_type == 1) { // ACL 372 conn = connection_for_address(addr); 373 if (!conn) { 374 conn = create_connection_for_addr(addr); 375 } 376 // TODO: check for malloc failure 377 conn->state = ACCEPTED_CONNECTION_REQUEST; 378 hci_send_cmd(&hci_accept_connection_request, addr, 1); 379 } else { 380 // TODO: decline request 381 } 382 break; 383 384 case HCI_EVENT_CONNECTION_COMPLETE: 385 // Connection management 386 bt_flip_addr(addr, &packet[5]); 387 log_dbg("Connection_complete (status=%u)", packet[2]); print_bd_addr(addr); log_dbg("\n"); 388 conn = connection_for_address(addr); 389 if (conn) { 390 if (!packet[2]){ 391 conn->state = OPEN; 392 conn->con_handle = READ_BT_16(packet, 3); 393 394 gettimeofday(&conn->timestamp, NULL); 395 run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 396 run_loop_add_timer(&conn->timeout); 397 398 log_dbg("New connection: handle %u, ", conn->con_handle); 399 print_bd_addr( conn->address ); 400 log_dbg("\n"); 401 402 hci_emit_nr_connections_changed(); 403 } else { 404 // connection failed, remove entry 405 linked_list_remove(&hci_stack.connections, (linked_item_t *) conn); 406 free( conn ); 407 408 // if authentication error, also delete link key 409 if (packet[2] == 0x05) { 410 hci_drop_link_key_for_bd_addr(&addr); 411 } 412 } 413 } 414 break; 415 416 case HCI_EVENT_LINK_KEY_REQUEST: 417 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_LINK_KEY_REQUEST); 418 if (!hci_stack.remote_device_db) break; 419 bt_flip_addr(addr, &packet[2]); 420 if ( hci_stack.remote_device_db->get_link_key( &addr, &link_key)){ 421 hci_send_cmd(&hci_link_key_request_reply, &addr, &link_key); 422 } else { 423 hci_send_cmd(&hci_link_key_request_negative_reply, &addr); 424 } 425 // request already answered 426 return; 427 428 case HCI_EVENT_LINK_KEY_NOTIFICATION: 429 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_LINK_KEY_NOTIFICATION); 430 if (!hci_stack.remote_device_db) break; 431 bt_flip_addr(addr, &packet[2]); 432 hci_stack.remote_device_db->put_link_key(&addr, (link_key_t *) &packet[8]); 433 // still forward event to allow dismiss of pairing dialog 434 break; 435 436 case HCI_EVENT_PIN_CODE_REQUEST: 437 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_PIN_CODE_REQUEST); 438 break; 439 440 case HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE: 441 if (!hci_stack.remote_device_db) break; 442 if (packet[2]) break; // status not ok 443 bt_flip_addr(addr, &packet[3]); 444 bzero(&device_name, sizeof(device_name_t)); 445 strncpy((char*) device_name, (char*) &packet[9], 248); 446 hci_stack.remote_device_db->put_name(&addr, &device_name); 447 break; 448 449 case HCI_EVENT_INQUIRY_RESULT: 450 case HCI_EVENT_INQUIRY_RESULT_WITH_RSSI: 451 if (!hci_stack.remote_device_db) break; 452 // first send inq result packet 453 hci_stack.packet_handler(HCI_EVENT_PACKET, packet, size); 454 // then send cached remote names 455 for (i=0; i<packet[2];i++){ 456 bt_flip_addr(addr, &packet[3+i*6]); 457 if (hci_stack.remote_device_db->get_name(&addr, &device_name)){ 458 hci_emit_remote_name_cached(&addr, &device_name); 459 } 460 } 461 return; 462 463 case HCI_EVENT_DISCONNECTION_COMPLETE: 464 if (!packet[2]){ 465 handle = READ_BT_16(packet, 3); 466 hci_connection_t * conn = connection_for_handle(handle); 467 if (conn) { 468 hci_shutdown_connection(conn); 469 } 470 } 471 break; 472 473 default: 474 break; 475 } 476 477 // handle BT initialization 478 if (hci_stack.state == HCI_STATE_INITIALIZING){ 479 // handle H4 synchronization loss on restart 480 // if (hci_stack.substate == 1 && packet[0] == HCI_EVENT_HARDWARE_ERROR){ 481 // hci_stack.substate = 0; 482 // } 483 // handle normal init sequence 484 if (hci_stack.substate % 2){ 485 // odd: waiting for event 486 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE){ 487 hci_stack.substate++; 488 } 489 } 490 } 491 492 hci_stack.packet_handler(HCI_EVENT_PACKET, packet, size); 493 494 // execute main loop 495 hci_run(); 496 } 497 498 void packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 499 switch (packet_type) { 500 case HCI_EVENT_PACKET: 501 event_handler(packet, size); 502 break; 503 case HCI_ACL_DATA_PACKET: 504 acl_handler(packet, size); 505 break; 506 default: 507 break; 508 } 509 } 510 511 /** Register HCI packet handlers */ 512 void hci_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){ 513 hci_stack.packet_handler = handler; 514 } 515 516 void hci_init(hci_transport_t *transport, void *config, bt_control_t *control, remote_device_db_t * remote_device_db){ 517 518 // reference to use transport layer implementation 519 hci_stack.hci_transport = transport; 520 521 // references to used control implementation 522 hci_stack.control = control; 523 524 // reference to used config 525 hci_stack.config = config; 526 527 // no connections yet 528 hci_stack.connections = NULL; 529 530 // empty cmd buffer 531 hci_stack.hci_cmd_buffer = malloc(3+255); 532 533 // higher level handler 534 hci_stack.packet_handler = dummy_handler; 535 536 // store and open remote device db 537 hci_stack.remote_device_db = remote_device_db; 538 if (hci_stack.remote_device_db) { 539 hci_stack.remote_device_db->open(); 540 } 541 542 // register packet handlers with transport 543 transport->register_packet_handler(&packet_handler); 544 } 545 546 void hci_close(){ 547 // close remote device db 548 if (hci_stack.remote_device_db) { 549 hci_stack.remote_device_db->close(); 550 } 551 } 552 553 // State-Module-Driver overview 554 // state module low-level 555 // HCI_STATE_OFF off close 556 // HCI_STATE_INITIALIZING, on open 557 // HCI_STATE_WORKING, on open 558 // HCI_STATE_HALTING, on open 559 // HCI_STATE_SLEEPING, off/sleep close 560 // HCI_STATE_FALLING_ASLEEP on open 561 562 static int hci_power_control_on(){ 563 564 // power on 565 int err = 0; 566 if (hci_stack.control && hci_stack.control->on){ 567 err = (*hci_stack.control->on)(hci_stack.config); 568 } 569 if (err){ 570 log_err( "POWER_ON failed\n"); 571 hci_emit_hci_open_failed(); 572 return err; 573 } 574 575 // open low-level device 576 err = hci_stack.hci_transport->open(hci_stack.config); 577 if (err){ 578 log_err( "HCI_INIT failed, turning Bluetooth off again\n"); 579 if (hci_stack.control && hci_stack.control->off){ 580 (*hci_stack.control->off)(hci_stack.config); 581 } 582 hci_emit_hci_open_failed(); 583 return err; 584 } 585 return 0; 586 } 587 588 static void hci_power_control_off(){ 589 590 // close low-level device 591 hci_stack.hci_transport->close(hci_stack.config); 592 593 // power off 594 if (hci_stack.control && hci_stack.control->off){ 595 (*hci_stack.control->off)(hci_stack.config); 596 } 597 hci_stack.state = HCI_STATE_OFF; 598 } 599 600 static void hci_power_control_sleep(){ 601 602 log_dbg("hci_power_control_sleep"); 603 604 #if 0 605 // don't close serial port during sleep 606 607 // close low-level device 608 hci_stack.hci_transport->close(hci_stack.config); 609 #endif 610 611 // sleep mode 612 if (hci_stack.control && hci_stack.control->sleep){ 613 (*hci_stack.control->sleep)(hci_stack.config); 614 } 615 616 hci_stack.state = HCI_STATE_SLEEPING; 617 } 618 619 static int hci_power_control_wake(){ 620 621 log_dbg("hci_power_control_wake"); 622 623 // wake on 624 if (hci_stack.control && hci_stack.control->wake){ 625 (*hci_stack.control->wake)(hci_stack.config); 626 } 627 628 #if 0 629 // open low-level device 630 int err = hci_stack.hci_transport->open(hci_stack.config); 631 if (err){ 632 log_err( "HCI_INIT failed, turning Bluetooth off again\n"); 633 if (hci_stack.control && hci_stack.control->off){ 634 (*hci_stack.control->off)(hci_stack.config); 635 } 636 hci_emit_hci_open_failed(); 637 return err; 638 } 639 #endif 640 641 return 0; 642 } 643 644 645 int hci_power_control(HCI_POWER_MODE power_mode){ 646 647 log_dbg("hci_power_control: %u\n", power_mode); 648 649 int err = 0; 650 switch (hci_stack.state){ 651 652 case HCI_STATE_OFF: 653 switch (power_mode){ 654 case HCI_POWER_ON: 655 err = hci_power_control_on(); 656 if (err) return err; 657 // set up state machine 658 hci_stack.num_cmd_packets = 1; // assume that one cmd can be sent 659 hci_stack.state = HCI_STATE_INITIALIZING; 660 hci_stack.substate = 0; 661 break; 662 case HCI_POWER_OFF: 663 // do nothing 664 break; 665 case HCI_POWER_SLEEP: 666 // do nothing (with SLEEP == OFF) 667 break; 668 } 669 break; 670 671 case HCI_STATE_INITIALIZING: 672 switch (power_mode){ 673 case HCI_POWER_ON: 674 // do nothing 675 break; 676 case HCI_POWER_OFF: 677 // no connections yet, just turn it off 678 hci_power_control_off(); 679 break; 680 case HCI_POWER_SLEEP: 681 // no connections yet, just turn it off 682 hci_power_control_sleep(); 683 break; 684 } 685 break; 686 687 case HCI_STATE_WORKING: 688 switch (power_mode){ 689 case HCI_POWER_ON: 690 // do nothing 691 break; 692 case HCI_POWER_OFF: 693 // see hci_run 694 hci_stack.state = HCI_STATE_HALTING; 695 break; 696 case HCI_POWER_SLEEP: 697 // see hci_run 698 hci_stack.state = HCI_STATE_FALLING_ASLEEP; 699 break; 700 } 701 break; 702 703 case HCI_STATE_HALTING: 704 switch (power_mode){ 705 case HCI_POWER_ON: 706 // set up state machine 707 hci_stack.state = HCI_STATE_INITIALIZING; 708 hci_stack.substate = 0; 709 break; 710 case HCI_POWER_OFF: 711 // do nothing 712 break; 713 case HCI_POWER_SLEEP: 714 // see hci_run 715 hci_stack.state = HCI_STATE_FALLING_ASLEEP; 716 break; 717 } 718 break; 719 720 case HCI_STATE_FALLING_ASLEEP: 721 switch (power_mode){ 722 case HCI_POWER_ON: 723 // set up state machine 724 hci_stack.num_cmd_packets = 1; // assume that one cmd can be sent 725 hci_stack.state = HCI_STATE_INITIALIZING; 726 hci_stack.substate = 0; 727 break; 728 case HCI_POWER_OFF: 729 // see hci_run 730 hci_stack.state = HCI_STATE_HALTING; 731 break; 732 case HCI_POWER_SLEEP: 733 // do nothing 734 break; 735 } 736 break; 737 738 case HCI_STATE_SLEEPING: 739 switch (power_mode){ 740 case HCI_POWER_ON: 741 err = hci_power_control_wake(); 742 if (err) return err; 743 // set up state machine 744 hci_stack.num_cmd_packets = 1; // assume that one cmd can be sent 745 hci_stack.state = HCI_STATE_INITIALIZING; 746 hci_stack.substate = 0; 747 break; 748 case HCI_POWER_OFF: 749 hci_stack.state = HCI_STATE_OFF; 750 break; 751 case HCI_POWER_SLEEP: 752 // do nothing 753 break; 754 } 755 break; 756 } 757 758 // create internal event 759 hci_emit_state(); 760 761 // trigger next/first action 762 hci_run(); 763 764 return 0; 765 } 766 767 void hci_discoverable_control(uint8_t enable){ 768 if (enable) enable = 1; // normalize argument 769 770 if (hci_stack.discoverable == enable){ 771 hci_emit_discoverable_enabled(hci_stack.discoverable); 772 return; 773 } 774 775 hci_send_cmd(&hci_write_scan_enable, 2 | enable); // 1 = inq scan, 2 = page scan 776 hci_stack.discoverable = enable; 777 } 778 779 void hci_run(){ 780 781 if (hci_stack.num_cmd_packets == 0) { 782 // cannot send command yet 783 return; 784 } 785 786 hci_connection_t * connection; 787 788 switch (hci_stack.state){ 789 case HCI_STATE_INITIALIZING: 790 if (hci_stack.substate % 2) { 791 // odd: waiting for command completion 792 return; 793 } 794 switch (hci_stack.substate >> 1){ 795 case 0: 796 hci_send_cmd(&hci_reset); 797 break; 798 case 1: 799 // custom initialization 800 if (hci_stack.control && hci_stack.control->next_command){ 801 uint8_t * cmd = (*hci_stack.control->next_command)(hci_stack.config); 802 if (cmd) { 803 int size = 3 + cmd[2]; 804 hci_stack.hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, cmd, size); 805 hci_stack.substate = 0; // more init commands 806 break; 807 } 808 } 809 // otherwise continue 810 hci_send_cmd(&hci_read_bd_addr); 811 break; 812 case 2: 813 hci_send_cmd(&hci_read_buffer_size); 814 break; 815 case 3: 816 // ca. 15 sec 817 hci_send_cmd(&hci_write_page_timeout, 0x6000); 818 break; 819 case 4: 820 hci_send_cmd(&hci_write_scan_enable, 3); // 3 inq scan + page scan 821 break; 822 case 5: 823 #ifndef EMBEDDED 824 { 825 char hostname[30]; 826 gethostname(hostname, 30); 827 hostname[29] = '\0'; 828 hci_send_cmd(&hci_write_local_name, hostname); 829 break; 830 } 831 case 6: 832 #endif 833 // done. 834 hci_stack.state = HCI_STATE_WORKING; 835 hci_emit_state(); 836 break; 837 default: 838 break; 839 } 840 hci_stack.substate++; 841 break; 842 843 case HCI_STATE_HALTING: 844 845 log_dbg("HCI_STATE_HALTING\n"); 846 // close all open connections 847 connection = (hci_connection_t *) hci_stack.connections; 848 if (connection){ 849 log_dbg("HCI_STATE_HALTING, connection %u, handle %u\n", (int) connection, connection->con_handle); 850 // send disconnect 851 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 852 853 // send disconnected event right away - causes higher layer connections to get closed, too. 854 hci_shutdown_connection(connection); 855 856 // remove from table 857 hci_stack.connections = connection->item.next; 858 return; 859 } 860 log_dbg("HCI_STATE_HALTING, calling off\n"); 861 862 // switch mode 863 hci_power_control_off(); 864 hci_emit_state(); 865 log_dbg("HCI_STATE_HALTING, done\n"); 866 break; 867 868 case HCI_STATE_FALLING_ASLEEP: 869 // close all open connections 870 connection = (hci_connection_t *) hci_stack.connections; 871 if (connection){ 872 // send disconnect 873 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 874 875 // send disconnected event right away - causes higher layer connections to get closed, too. 876 hci_shutdown_connection(connection); 877 878 // remove from table 879 hci_stack.connections = connection->item.next; 880 return; 881 } 882 883 // switch mode 884 hci_power_control_sleep(); 885 hci_emit_state(); 886 break; 887 888 default: 889 break; 890 } 891 } 892 893 int hci_send_cmd_packet(uint8_t *packet, int size){ 894 bd_addr_t addr; 895 hci_connection_t * conn; 896 // house-keeping 897 898 // create_connection? 899 if (IS_COMMAND(packet, hci_create_connection)){ 900 bt_flip_addr(addr, &packet[3]); 901 log_dbg("Create_connection to "); print_bd_addr(addr); log_dbg("\n"); 902 conn = connection_for_address(addr); 903 if (conn) { 904 // if connection exists 905 if (conn->state == OPEN) { 906 // if OPEN, emit connection complete command 907 hci_emit_connection_complete(conn); 908 } 909 // otherwise, just ignore 910 return 0; // don't sent packet to controller 911 912 } else{ 913 conn = create_connection_for_addr(addr); 914 if (conn){ 915 // create connection struct and register, state = SENT_CREATE_CONNECTION 916 conn->state = SENT_CREATE_CONNECTION; 917 } 918 } 919 } 920 921 if (IS_COMMAND(packet, hci_link_key_request_reply)){ 922 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_REPLY); 923 } 924 if (IS_COMMAND(packet, hci_link_key_request_negative_reply)){ 925 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_NEGATIVE_REQUEST); 926 } 927 if (IS_COMMAND(packet, hci_pin_code_request_reply)){ 928 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_PIN_CODE_REPLY); 929 } 930 if (IS_COMMAND(packet, hci_pin_code_request_negative_reply)){ 931 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_PIN_CODE_NEGATIVE_REPLY); 932 } 933 934 if (IS_COMMAND(packet, hci_delete_stored_link_key)){ 935 if (hci_stack.remote_device_db){ 936 bt_flip_addr(addr, &packet[3]); 937 hci_stack.remote_device_db->delete_link_key(&addr); 938 } 939 } 940 941 hci_stack.num_cmd_packets--; 942 return hci_stack.hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, packet, size); 943 } 944 945 /** 946 * pre: numcmds >= 0 - it's allowed to send a command to the controller 947 */ 948 int hci_send_cmd(const hci_cmd_t *cmd, ...){ 949 va_list argptr; 950 va_start(argptr, cmd); 951 uint8_t * hci_cmd_buffer = hci_stack.hci_cmd_buffer; 952 uint16_t size = hci_create_cmd_internal(hci_stack.hci_cmd_buffer, cmd, argptr); 953 va_end(argptr); 954 return hci_send_cmd_packet(hci_cmd_buffer, size); 955 } 956 957 // Create various non-HCI events. 958 // TODO: generalize, use table similar to hci_create_command 959 960 void hci_emit_state(){ 961 uint8_t len = 3; 962 uint8_t event[len]; 963 event[0] = BTSTACK_EVENT_STATE; 964 event[1] = len - 3; 965 event[2] = hci_stack.state; 966 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 967 hci_stack.packet_handler(HCI_EVENT_PACKET, event, len); 968 } 969 970 void hci_emit_connection_complete(hci_connection_t *conn){ 971 uint8_t len = 13; 972 uint8_t event[len]; 973 event[0] = HCI_EVENT_CONNECTION_COMPLETE; 974 event[1] = len - 3; 975 event[2] = 0; // status = OK 976 bt_store_16(event, 3, conn->con_handle); 977 bt_flip_addr(&event[5], conn->address); 978 event[11] = 1; // ACL connection 979 event[12] = 0; // encryption disabled 980 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 981 hci_stack.packet_handler(HCI_EVENT_PACKET, event, len); 982 } 983 984 void hci_emit_l2cap_check_timeout(hci_connection_t *conn){ 985 uint8_t len = 4; 986 uint8_t event[len]; 987 event[0] = L2CAP_EVENT_TIMEOUT_CHECK; 988 event[1] = len - 2; 989 bt_store_16(event, 2, conn->con_handle); 990 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 991 hci_stack.packet_handler(HCI_EVENT_PACKET, event, len); 992 } 993 994 void hci_emit_nr_connections_changed(){ 995 uint8_t len = 3; 996 uint8_t event[len]; 997 event[0] = BTSTACK_EVENT_NR_CONNECTIONS_CHANGED; 998 event[1] = len - 2; 999 event[2] = nr_hci_connections(); 1000 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 1001 hci_stack.packet_handler(HCI_EVENT_PACKET, event, len); 1002 } 1003 1004 void hci_emit_hci_open_failed(){ 1005 uint8_t len = 2; 1006 uint8_t event[len]; 1007 event[0] = BTSTACK_EVENT_POWERON_FAILED; 1008 event[1] = len - 2; 1009 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 1010 hci_stack.packet_handler(HCI_EVENT_PACKET, event, len); 1011 } 1012 1013 1014 void hci_emit_btstack_version() { 1015 uint8_t len = 6; 1016 uint8_t event[len]; 1017 event[0] = BTSTACK_EVENT_VERSION; 1018 event[1] = len - 2; 1019 event[len++] = BTSTACK_MAJOR; 1020 event[len++] = BTSTACK_MINOR; 1021 bt_store_16(event, len, BTSTACK_REVISION); 1022 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 1023 hci_stack.packet_handler(HCI_EVENT_PACKET, event, len); 1024 } 1025 1026 void hci_emit_system_bluetooth_enabled(uint8_t enabled){ 1027 uint8_t len = 3; 1028 uint8_t event[len]; 1029 event[0] = BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED; 1030 event[1] = len - 2; 1031 event[2] = enabled; 1032 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 1033 hci_stack.packet_handler(HCI_EVENT_PACKET, event, len); 1034 } 1035 1036 void hci_emit_remote_name_cached(bd_addr_t *addr, device_name_t *name){ 1037 uint16_t len = 2+1+6+248; 1038 uint8_t event[len]; 1039 event[0] = BTSTACK_EVENT_REMOTE_NAME_CACHED; 1040 event[1] = len - 2; 1041 event[2] = 0; // just to be compatible with HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE 1042 bt_flip_addr(&event[3], *addr); 1043 memcpy(&event[9], name, 248); 1044 hci_dump_packet(HCI_EVENT_PACKET, 0, event, len); 1045 hci_stack.packet_handler(HCI_EVENT_PACKET, event, len); 1046 } 1047 1048 void hci_emit_discoverable_enabled(uint8_t enabled){ 1049 uint8_t len = 3; 1050 uint8_t event[len]; 1051 event[0] = BTSTACK_EVENT_DISCOVERABLE_ENABLED; 1052 event[1] = len - 2; 1053 event[2] = enabled; 1054 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 1055 hci_stack.packet_handler(HCI_EVENT_PACKET, event, len); 1056 } 1057