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 switch (packet[0]) { 328 329 case HCI_EVENT_COMMAND_COMPLETE: 330 // get num cmd packets 331 // log_dbg("HCI_EVENT_COMMAND_COMPLETE cmds old %u - new %u\n", hci_stack.num_cmd_packets, packet[2]); 332 hci_stack.num_cmd_packets = packet[2]; 333 334 if (COMMAND_COMPLETE_EVENT(packet, hci_read_buffer_size)){ 335 // from offset 5 336 // status 337 hci_stack.acl_data_packet_length = READ_BT_16(packet, 6); 338 // ignore: SCO data packet len (8) 339 hci_stack.total_num_acl_packets = packet[9]; 340 // ignore: total num SCO packets 341 if (hci_stack.state == HCI_STATE_INITIALIZING){ 342 log_dbg("hci_read_buffer_size: size %u, count %u\n", hci_stack.acl_data_packet_length, hci_stack.total_num_acl_packets); 343 } 344 } 345 if (COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 346 hci_emit_discoverable_enabled(hci_stack.discoverable); 347 } 348 break; 349 350 case HCI_EVENT_COMMAND_STATUS: 351 // get num cmd packets 352 // log_dbg("HCI_EVENT_COMMAND_STATUS cmds - old %u - new %u\n", hci_stack.num_cmd_packets, packet[3]); 353 hci_stack.num_cmd_packets = packet[3]; 354 break; 355 356 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS: 357 for (i=0; i<packet[2];i++){ 358 handle = READ_BT_16(packet, 3 + 2*i); 359 uint16_t num_packets = READ_BT_16(packet, 3 + packet[2]*2 + 2*i); 360 conn = connection_for_handle(handle); 361 if (!conn){ 362 log_err("hci_number_completed_packet lists unused con handle %u\n", handle); 363 continue; 364 } 365 conn->num_acl_packets_sent -= num_packets; 366 // log_dbg("hci_number_completed_packet %u processed for handle %u, outstanding %u\n", num_packets, handle, conn->num_acl_packets_sent); 367 } 368 break; 369 370 case HCI_EVENT_CONNECTION_REQUEST: 371 bt_flip_addr(addr, &packet[2]); 372 // TODO: eval COD 8-10 373 uint8_t link_type = packet[11]; 374 log_dbg("Connection_incoming: "); print_bd_addr(addr); log_dbg(", type %u\n", link_type); 375 if (link_type == 1) { // ACL 376 conn = connection_for_address(addr); 377 if (!conn) { 378 conn = create_connection_for_addr(addr); 379 } 380 // TODO: check for malloc failure 381 conn->state = ACCEPTED_CONNECTION_REQUEST; 382 hci_send_cmd(&hci_accept_connection_request, addr, 1); 383 } else { 384 // TODO: decline request 385 } 386 break; 387 388 case HCI_EVENT_CONNECTION_COMPLETE: 389 // Connection management 390 bt_flip_addr(addr, &packet[5]); 391 log_dbg("Connection_complete (status=%u)", packet[2]); print_bd_addr(addr); log_dbg("\n"); 392 conn = connection_for_address(addr); 393 if (conn) { 394 if (!packet[2]){ 395 conn->state = OPEN; 396 conn->con_handle = READ_BT_16(packet, 3); 397 398 gettimeofday(&conn->timestamp, NULL); 399 run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 400 run_loop_add_timer(&conn->timeout); 401 402 log_dbg("New connection: handle %u, ", conn->con_handle); 403 print_bd_addr( conn->address ); 404 log_dbg("\n"); 405 406 hci_emit_nr_connections_changed(); 407 } else { 408 // connection failed, remove entry 409 linked_list_remove(&hci_stack.connections, (linked_item_t *) conn); 410 free( conn ); 411 412 // if authentication error, also delete link key 413 if (packet[2] == 0x05) { 414 hci_drop_link_key_for_bd_addr(&addr); 415 } 416 } 417 } 418 break; 419 420 case HCI_EVENT_LINK_KEY_REQUEST: 421 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_LINK_KEY_REQUEST); 422 if (!hci_stack.remote_device_db) break; 423 bt_flip_addr(addr, &packet[2]); 424 if ( hci_stack.remote_device_db->get_link_key( &addr, &link_key)){ 425 hci_send_cmd(&hci_link_key_request_reply, &addr, &link_key); 426 } else { 427 hci_send_cmd(&hci_link_key_request_negative_reply, &addr); 428 } 429 // request already answered 430 return; 431 432 case HCI_EVENT_LINK_KEY_NOTIFICATION: 433 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_LINK_KEY_NOTIFICATION); 434 if (!hci_stack.remote_device_db) break; 435 bt_flip_addr(addr, &packet[2]); 436 hci_stack.remote_device_db->put_link_key(&addr, (link_key_t *) &packet[8]); 437 // still forward event to allow dismiss of pairing dialog 438 break; 439 440 case HCI_EVENT_PIN_CODE_REQUEST: 441 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_PIN_CODE_REQUEST); 442 break; 443 444 case HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE: 445 if (!hci_stack.remote_device_db) break; 446 if (packet[2]) break; // status not ok 447 bt_flip_addr(addr, &packet[3]); 448 bzero(&device_name, sizeof(device_name_t)); 449 strncpy((char*) device_name, (char*) &packet[9], 248); 450 hci_stack.remote_device_db->put_name(&addr, &device_name); 451 break; 452 453 case HCI_EVENT_INQUIRY_RESULT: 454 case HCI_EVENT_INQUIRY_RESULT_WITH_RSSI: 455 if (!hci_stack.remote_device_db) break; 456 // first send inq result packet 457 hci_stack.packet_handler(HCI_EVENT_PACKET, packet, size); 458 // then send cached remote names 459 for (i=0; i<packet[2];i++){ 460 bt_flip_addr(addr, &packet[3+i*6]); 461 if (hci_stack.remote_device_db->get_name(&addr, &device_name)){ 462 hci_emit_remote_name_cached(&addr, &device_name); 463 } 464 } 465 return; 466 467 case HCI_EVENT_DISCONNECTION_COMPLETE: 468 if (!packet[2]){ 469 handle = READ_BT_16(packet, 3); 470 hci_connection_t * conn = connection_for_handle(handle); 471 if (conn) { 472 hci_shutdown_connection(conn); 473 } 474 } 475 break; 476 477 default: 478 break; 479 } 480 481 // handle BT initialization 482 if (hci_stack.state == HCI_STATE_INITIALIZING){ 483 // handle H4 synchronization loss on restart 484 // if (hci_stack.substate == 1 && packet[0] == HCI_EVENT_HARDWARE_ERROR){ 485 // hci_stack.substate = 0; 486 // } 487 // handle normal init sequence 488 if (hci_stack.substate % 2){ 489 // odd: waiting for event 490 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE){ 491 hci_stack.substate++; 492 } 493 } 494 } 495 496 // help with BT sleep 497 if (hci_stack.state == HCI_STATE_FALLING_ASLEEP 498 && hci_stack.substate == 1 499 && COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 500 hci_stack.substate++; 501 } 502 503 hci_stack.packet_handler(HCI_EVENT_PACKET, packet, size); 504 505 // execute main loop 506 hci_run(); 507 } 508 509 void packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 510 switch (packet_type) { 511 case HCI_EVENT_PACKET: 512 event_handler(packet, size); 513 break; 514 case HCI_ACL_DATA_PACKET: 515 acl_handler(packet, size); 516 break; 517 default: 518 break; 519 } 520 } 521 522 /** Register HCI packet handlers */ 523 void hci_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){ 524 hci_stack.packet_handler = handler; 525 } 526 527 void hci_init(hci_transport_t *transport, void *config, bt_control_t *control, remote_device_db_t * remote_device_db){ 528 529 // reference to use transport layer implementation 530 hci_stack.hci_transport = transport; 531 532 // references to used control implementation 533 hci_stack.control = control; 534 535 // reference to used config 536 hci_stack.config = config; 537 538 // no connections yet 539 hci_stack.connections = NULL; 540 541 // empty cmd buffer 542 hci_stack.hci_cmd_buffer = malloc(3+255); 543 544 // higher level handler 545 hci_stack.packet_handler = dummy_handler; 546 547 // store and open remote device db 548 hci_stack.remote_device_db = remote_device_db; 549 if (hci_stack.remote_device_db) { 550 hci_stack.remote_device_db->open(); 551 } 552 553 // register packet handlers with transport 554 transport->register_packet_handler(&packet_handler); 555 } 556 557 void hci_close(){ 558 // close remote device db 559 if (hci_stack.remote_device_db) { 560 hci_stack.remote_device_db->close(); 561 } 562 } 563 564 // State-Module-Driver overview 565 // state module low-level 566 // HCI_STATE_OFF off close 567 // HCI_STATE_INITIALIZING, on open 568 // HCI_STATE_WORKING, on open 569 // HCI_STATE_HALTING, on open 570 // HCI_STATE_SLEEPING, off/sleep close 571 // HCI_STATE_FALLING_ASLEEP on open 572 573 static int hci_power_control_on(){ 574 575 // power on 576 int err = 0; 577 if (hci_stack.control && hci_stack.control->on){ 578 err = (*hci_stack.control->on)(hci_stack.config); 579 } 580 if (err){ 581 log_err( "POWER_ON failed\n"); 582 hci_emit_hci_open_failed(); 583 return err; 584 } 585 586 // open low-level device 587 err = hci_stack.hci_transport->open(hci_stack.config); 588 if (err){ 589 log_err( "HCI_INIT failed, turning Bluetooth off again\n"); 590 if (hci_stack.control && hci_stack.control->off){ 591 (*hci_stack.control->off)(hci_stack.config); 592 } 593 hci_emit_hci_open_failed(); 594 return err; 595 } 596 return 0; 597 } 598 599 static void hci_power_control_off(){ 600 601 // close low-level device 602 hci_stack.hci_transport->close(hci_stack.config); 603 604 // power off 605 if (hci_stack.control && hci_stack.control->off){ 606 (*hci_stack.control->off)(hci_stack.config); 607 } 608 hci_stack.state = HCI_STATE_OFF; 609 } 610 611 static void hci_power_control_sleep(){ 612 613 log_dbg("hci_power_control_sleep"); 614 615 #if 0 616 // don't close serial port during sleep 617 618 // close low-level device 619 hci_stack.hci_transport->close(hci_stack.config); 620 #endif 621 622 // sleep mode 623 if (hci_stack.control && hci_stack.control->sleep){ 624 (*hci_stack.control->sleep)(hci_stack.config); 625 } 626 627 hci_stack.state = HCI_STATE_SLEEPING; 628 } 629 630 static int hci_power_control_wake(){ 631 632 log_dbg("hci_power_control_wake"); 633 634 // wake on 635 if (hci_stack.control && hci_stack.control->wake){ 636 (*hci_stack.control->wake)(hci_stack.config); 637 } 638 639 #if 0 640 // open low-level device 641 int err = hci_stack.hci_transport->open(hci_stack.config); 642 if (err){ 643 log_err( "HCI_INIT failed, turning Bluetooth off again\n"); 644 if (hci_stack.control && hci_stack.control->off){ 645 (*hci_stack.control->off)(hci_stack.config); 646 } 647 hci_emit_hci_open_failed(); 648 return err; 649 } 650 #endif 651 652 return 0; 653 } 654 655 656 int hci_power_control(HCI_POWER_MODE power_mode){ 657 658 log_dbg("hci_power_control: %u, current mode %u\n", power_mode, hci_stack.state); 659 660 int err = 0; 661 switch (hci_stack.state){ 662 663 case HCI_STATE_OFF: 664 switch (power_mode){ 665 case HCI_POWER_ON: 666 err = hci_power_control_on(); 667 if (err) return err; 668 // set up state machine 669 hci_stack.num_cmd_packets = 1; // assume that one cmd can be sent 670 hci_stack.state = HCI_STATE_INITIALIZING; 671 hci_stack.substate = 0; 672 break; 673 case HCI_POWER_OFF: 674 // do nothing 675 break; 676 case HCI_POWER_SLEEP: 677 // do nothing (with SLEEP == OFF) 678 break; 679 } 680 break; 681 682 case HCI_STATE_INITIALIZING: 683 switch (power_mode){ 684 case HCI_POWER_ON: 685 // do nothing 686 break; 687 case HCI_POWER_OFF: 688 // no connections yet, just turn it off 689 hci_power_control_off(); 690 break; 691 case HCI_POWER_SLEEP: 692 // no connections yet, just turn it off 693 hci_power_control_sleep(); 694 break; 695 } 696 break; 697 698 case HCI_STATE_WORKING: 699 switch (power_mode){ 700 case HCI_POWER_ON: 701 // do nothing 702 break; 703 case HCI_POWER_OFF: 704 // see hci_run 705 hci_stack.state = HCI_STATE_HALTING; 706 break; 707 case HCI_POWER_SLEEP: 708 // see hci_run 709 hci_stack.state = HCI_STATE_FALLING_ASLEEP; 710 hci_stack.substate = 0; 711 break; 712 } 713 break; 714 715 case HCI_STATE_HALTING: 716 switch (power_mode){ 717 case HCI_POWER_ON: 718 // set up state machine 719 hci_stack.state = HCI_STATE_INITIALIZING; 720 hci_stack.substate = 0; 721 break; 722 case HCI_POWER_OFF: 723 // do nothing 724 break; 725 case HCI_POWER_SLEEP: 726 // see hci_run 727 hci_stack.state = HCI_STATE_FALLING_ASLEEP; 728 hci_stack.substate = 0; 729 break; 730 } 731 break; 732 733 case HCI_STATE_FALLING_ASLEEP: 734 switch (power_mode){ 735 case HCI_POWER_ON: 736 // set up state machine 737 hci_stack.num_cmd_packets = 1; // assume that one cmd can be sent 738 hci_stack.state = HCI_STATE_INITIALIZING; 739 hci_stack.substate = 0; 740 break; 741 case HCI_POWER_OFF: 742 // see hci_run 743 hci_stack.state = HCI_STATE_HALTING; 744 break; 745 case HCI_POWER_SLEEP: 746 // do nothing 747 break; 748 } 749 break; 750 751 case HCI_STATE_SLEEPING: 752 switch (power_mode){ 753 case HCI_POWER_ON: 754 err = hci_power_control_wake(); 755 if (err) return err; 756 // set up state machine 757 hci_stack.num_cmd_packets = 1; // assume that one cmd can be sent 758 hci_stack.state = HCI_STATE_INITIALIZING; 759 hci_stack.substate = 0; 760 break; 761 case HCI_POWER_OFF: 762 hci_stack.state = HCI_STATE_OFF; 763 break; 764 case HCI_POWER_SLEEP: 765 // do nothing 766 break; 767 } 768 break; 769 } 770 771 // create internal event 772 hci_emit_state(); 773 774 // trigger next/first action 775 hci_run(); 776 777 return 0; 778 } 779 780 void hci_discoverable_control(uint8_t enable){ 781 if (enable) enable = 1; // normalize argument 782 783 if (hci_stack.discoverable == enable){ 784 hci_emit_discoverable_enabled(hci_stack.discoverable); 785 return; 786 } 787 788 hci_send_cmd(&hci_write_scan_enable, 2 | enable); // 1 = inq scan, 2 = page scan 789 hci_stack.discoverable = enable; 790 } 791 792 void hci_run(){ 793 794 if (hci_stack.num_cmd_packets == 0) { 795 // cannot send command yet 796 return; 797 } 798 799 hci_connection_t * connection; 800 801 switch (hci_stack.state){ 802 case HCI_STATE_INITIALIZING: 803 if (hci_stack.substate % 2) { 804 // odd: waiting for command completion 805 return; 806 } 807 switch (hci_stack.substate >> 1){ 808 case 0: 809 hci_send_cmd(&hci_reset); 810 break; 811 case 1: 812 // custom initialization 813 if (hci_stack.control && hci_stack.control->next_command){ 814 uint8_t * cmd = (*hci_stack.control->next_command)(hci_stack.config); 815 if (cmd) { 816 int size = 3 + cmd[2]; 817 hci_stack.hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, cmd, size); 818 hci_stack.substate = 0; // more init commands 819 break; 820 } 821 } 822 // otherwise continue 823 hci_send_cmd(&hci_read_bd_addr); 824 break; 825 case 2: 826 hci_send_cmd(&hci_read_buffer_size); 827 break; 828 case 3: 829 // ca. 15 sec 830 hci_send_cmd(&hci_write_page_timeout, 0x6000); 831 break; 832 case 4: 833 hci_send_cmd(&hci_write_scan_enable, 2); // page scan 834 break; 835 case 5: 836 #ifndef EMBEDDED 837 { 838 char hostname[30]; 839 gethostname(hostname, 30); 840 hostname[29] = '\0'; 841 hci_send_cmd(&hci_write_local_name, hostname); 842 break; 843 } 844 case 6: 845 #endif 846 // done. 847 hci_stack.state = HCI_STATE_WORKING; 848 hci_emit_state(); 849 break; 850 default: 851 break; 852 } 853 hci_stack.substate++; 854 break; 855 856 case HCI_STATE_HALTING: 857 858 log_dbg("HCI_STATE_HALTING\n"); 859 // close all open connections 860 connection = (hci_connection_t *) hci_stack.connections; 861 if (connection){ 862 log_dbg("HCI_STATE_HALTING, connection %u, handle %u\n", (int) connection, connection->con_handle); 863 // send disconnect 864 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 865 866 // send disconnected event right away - causes higher layer connections to get closed, too. 867 hci_shutdown_connection(connection); 868 869 // remove from table 870 hci_stack.connections = connection->item.next; 871 return; 872 } 873 log_dbg("HCI_STATE_HALTING, calling off\n"); 874 875 // switch mode 876 hci_power_control_off(); 877 hci_emit_state(); 878 log_dbg("HCI_STATE_HALTING, done\n"); 879 break; 880 881 case HCI_STATE_FALLING_ASLEEP: 882 switch(hci_stack.substate) { 883 case 0: 884 log_dbg("HCI_STATE_FALLING_ASLEEP\n"); 885 // close all open connections 886 connection = (hci_connection_t *) hci_stack.connections; 887 if (connection){ 888 log_dbg("HCI_STATE_FALLING_ASLEEP, connection %u, handle %u\n", (int) connection, connection->con_handle); 889 // send disconnect 890 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 891 892 // send disconnected event right away - causes higher layer connections to get closed, too. 893 hci_shutdown_connection(connection); 894 895 // remove from table 896 hci_stack.connections = connection->item.next; 897 return; 898 } 899 900 log_dbg("HCI_STATE_HALTING, disabling inq & page scans\n"); 901 902 // disable page and inquiry scan 903 hci_send_cmd(&hci_write_scan_enable, 0); // none 904 905 // continue in next sub state 906 hci_stack.substate++; 907 break; 908 case 1: 909 // wait for command complete "hci_write_scan_enable" in event_handler(); 910 break; 911 case 2: 912 log_dbg("HCI_STATE_HALTING, calling sleep\n"); 913 // switch mode 914 hci_power_control_sleep(); // changes hci_stack.state to SLEEP 915 hci_emit_state(); 916 default: 917 break; 918 } 919 break; 920 921 default: 922 break; 923 } 924 } 925 926 int hci_send_cmd_packet(uint8_t *packet, int size){ 927 bd_addr_t addr; 928 hci_connection_t * conn; 929 // house-keeping 930 931 // create_connection? 932 if (IS_COMMAND(packet, hci_create_connection)){ 933 bt_flip_addr(addr, &packet[3]); 934 log_dbg("Create_connection to "); print_bd_addr(addr); log_dbg("\n"); 935 conn = connection_for_address(addr); 936 if (conn) { 937 // if connection exists 938 if (conn->state == OPEN) { 939 // if OPEN, emit connection complete command 940 hci_emit_connection_complete(conn); 941 } 942 // otherwise, just ignore 943 return 0; // don't sent packet to controller 944 945 } else{ 946 conn = create_connection_for_addr(addr); 947 if (conn){ 948 // create connection struct and register, state = SENT_CREATE_CONNECTION 949 conn->state = SENT_CREATE_CONNECTION; 950 } 951 } 952 } 953 954 if (IS_COMMAND(packet, hci_link_key_request_reply)){ 955 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_REPLY); 956 } 957 if (IS_COMMAND(packet, hci_link_key_request_negative_reply)){ 958 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_NEGATIVE_REQUEST); 959 } 960 if (IS_COMMAND(packet, hci_pin_code_request_reply)){ 961 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_PIN_CODE_REPLY); 962 } 963 if (IS_COMMAND(packet, hci_pin_code_request_negative_reply)){ 964 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_PIN_CODE_NEGATIVE_REPLY); 965 } 966 967 if (IS_COMMAND(packet, hci_delete_stored_link_key)){ 968 if (hci_stack.remote_device_db){ 969 bt_flip_addr(addr, &packet[3]); 970 hci_stack.remote_device_db->delete_link_key(&addr); 971 } 972 } 973 974 hci_stack.num_cmd_packets--; 975 return hci_stack.hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, packet, size); 976 } 977 978 /** 979 * pre: numcmds >= 0 - it's allowed to send a command to the controller 980 */ 981 int hci_send_cmd(const hci_cmd_t *cmd, ...){ 982 va_list argptr; 983 va_start(argptr, cmd); 984 uint8_t * hci_cmd_buffer = hci_stack.hci_cmd_buffer; 985 uint16_t size = hci_create_cmd_internal(hci_stack.hci_cmd_buffer, cmd, argptr); 986 va_end(argptr); 987 return hci_send_cmd_packet(hci_cmd_buffer, size); 988 } 989 990 // Create various non-HCI events. 991 // TODO: generalize, use table similar to hci_create_command 992 993 void hci_emit_state(){ 994 uint8_t len = 3; 995 uint8_t event[len]; 996 event[0] = BTSTACK_EVENT_STATE; 997 event[1] = len - 3; 998 event[2] = hci_stack.state; 999 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 1000 hci_stack.packet_handler(HCI_EVENT_PACKET, event, len); 1001 } 1002 1003 void hci_emit_connection_complete(hci_connection_t *conn){ 1004 uint8_t len = 13; 1005 uint8_t event[len]; 1006 event[0] = HCI_EVENT_CONNECTION_COMPLETE; 1007 event[1] = len - 3; 1008 event[2] = 0; // status = OK 1009 bt_store_16(event, 3, conn->con_handle); 1010 bt_flip_addr(&event[5], conn->address); 1011 event[11] = 1; // ACL connection 1012 event[12] = 0; // encryption disabled 1013 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 1014 hci_stack.packet_handler(HCI_EVENT_PACKET, event, len); 1015 } 1016 1017 void hci_emit_l2cap_check_timeout(hci_connection_t *conn){ 1018 uint8_t len = 4; 1019 uint8_t event[len]; 1020 event[0] = L2CAP_EVENT_TIMEOUT_CHECK; 1021 event[1] = len - 2; 1022 bt_store_16(event, 2, conn->con_handle); 1023 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 1024 hci_stack.packet_handler(HCI_EVENT_PACKET, event, len); 1025 } 1026 1027 void hci_emit_nr_connections_changed(){ 1028 uint8_t len = 3; 1029 uint8_t event[len]; 1030 event[0] = BTSTACK_EVENT_NR_CONNECTIONS_CHANGED; 1031 event[1] = len - 2; 1032 event[2] = nr_hci_connections(); 1033 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 1034 hci_stack.packet_handler(HCI_EVENT_PACKET, event, len); 1035 } 1036 1037 void hci_emit_hci_open_failed(){ 1038 uint8_t len = 2; 1039 uint8_t event[len]; 1040 event[0] = BTSTACK_EVENT_POWERON_FAILED; 1041 event[1] = len - 2; 1042 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 1043 hci_stack.packet_handler(HCI_EVENT_PACKET, event, len); 1044 } 1045 1046 1047 void hci_emit_btstack_version() { 1048 uint8_t len = 6; 1049 uint8_t event[len]; 1050 event[0] = BTSTACK_EVENT_VERSION; 1051 event[1] = len - 2; 1052 event[len++] = BTSTACK_MAJOR; 1053 event[len++] = BTSTACK_MINOR; 1054 bt_store_16(event, len, BTSTACK_REVISION); 1055 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 1056 hci_stack.packet_handler(HCI_EVENT_PACKET, event, len); 1057 } 1058 1059 void hci_emit_system_bluetooth_enabled(uint8_t enabled){ 1060 uint8_t len = 3; 1061 uint8_t event[len]; 1062 event[0] = BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED; 1063 event[1] = len - 2; 1064 event[2] = enabled; 1065 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 1066 hci_stack.packet_handler(HCI_EVENT_PACKET, event, len); 1067 } 1068 1069 void hci_emit_remote_name_cached(bd_addr_t *addr, device_name_t *name){ 1070 uint16_t len = 2+1+6+248; 1071 uint8_t event[len]; 1072 event[0] = BTSTACK_EVENT_REMOTE_NAME_CACHED; 1073 event[1] = len - 2; 1074 event[2] = 0; // just to be compatible with HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE 1075 bt_flip_addr(&event[3], *addr); 1076 memcpy(&event[9], name, 248); 1077 hci_dump_packet(HCI_EVENT_PACKET, 0, event, len); 1078 hci_stack.packet_handler(HCI_EVENT_PACKET, event, len); 1079 } 1080 1081 void hci_emit_discoverable_enabled(uint8_t enabled){ 1082 uint8_t len = 3; 1083 uint8_t event[len]; 1084 event[0] = BTSTACK_EVENT_DISCOVERABLE_ENABLED; 1085 event[1] = len - 2; 1086 event[2] = enabled; 1087 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 1088 hci_stack.packet_handler(HCI_EVENT_PACKET, event, len); 1089 } 1090