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 <unistd.h> 40 #include <stdarg.h> 41 #include <string.h> 42 #include <stdio.h> 43 #include "hci.h" 44 #include "hci_dump.h" 45 46 // temp 47 #include "l2cap.h" 48 49 #define HCI_CONNECTION_TIMEOUT 10000 50 51 // the STACK is here 52 static hci_stack_t hci_stack; 53 54 /** 55 * get connection for a given handle 56 * 57 * @return connection OR NULL, if not found 58 */ 59 static hci_connection_t * connection_for_handle(hci_con_handle_t con_handle){ 60 linked_item_t *it; 61 for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next){ 62 if ( ((hci_connection_t *) it)->con_handle == con_handle){ 63 return (hci_connection_t *) it; 64 } 65 } 66 return NULL; 67 } 68 69 static void hci_connection_timeout_handler(timer_t *timer){ 70 hci_connection_t * connection = linked_item_get_user(&timer->item); 71 struct timeval tv; 72 gettimeofday(&tv, NULL); 73 if (tv.tv_sec > connection->timestamp.tv_sec + HCI_CONNECTION_TIMEOUT) { 74 // connections might be timed out 75 hci_emit_l2cap_check_timeout(connection); 76 run_loop_set_timer(timer, HCI_CONNECTION_TIMEOUT); 77 } else { 78 // next timeout check at 79 timer->timeout.tv_sec = connection->timestamp.tv_sec + HCI_CONNECTION_TIMEOUT; 80 } 81 run_loop_add_timer(timer); 82 } 83 84 static void hci_connection_timestamp(hci_connection_t *connection){ 85 gettimeofday(&connection->timestamp, NULL); 86 } 87 88 static void hci_connection_update_timestamp_for_acl(uint8_t *packet) { 89 // update timestamp 90 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 91 hci_connection_t *connection = connection_for_handle( con_handle); 92 if (connection) hci_connection_timestamp(connection); 93 } 94 95 /** 96 * create connection for given address 97 * 98 * @return connection OR NULL, if not found 99 */ 100 static hci_connection_t * create_connection_for_addr(bd_addr_t addr){ 101 hci_connection_t * conn = malloc( sizeof(hci_connection_t) ); 102 if (!conn) return NULL; 103 BD_ADDR_COPY(conn->address, addr); 104 conn->con_handle = 0xffff; 105 conn->flags = 0; 106 linked_item_set_user(&conn->timeout.item, conn); 107 conn->timeout.process = hci_connection_timeout_handler; 108 hci_connection_timestamp(conn); 109 linked_list_add(&hci_stack.connections, (linked_item_t *) conn); 110 return conn; 111 } 112 113 /** 114 * get connection for given address 115 * 116 * @return connection OR NULL, if not found 117 */ 118 static hci_connection_t * connection_for_address(bd_addr_t address){ 119 linked_item_t *it; 120 for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next){ 121 if ( ! BD_ADDR_CMP( ((hci_connection_t *) it)->address, address) ){ 122 return (hci_connection_t *) it; 123 } 124 } 125 return NULL; 126 } 127 128 /** 129 * count connections 130 */ 131 static int nr_hci_connections(){ 132 int count = 0; 133 linked_item_t *it; 134 for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next, count++); 135 return count; 136 } 137 138 /** 139 * Dummy handler called by HCI 140 */ 141 static void dummy_handler(uint8_t *packet, uint16_t size){ 142 } 143 144 /** 145 * Dummy control handler 146 */ 147 static int null_control_function(void *config){ 148 return 0; 149 } 150 static const char * null_control_name(void *config){ 151 return "Hardware unknown"; 152 } 153 static bt_control_t null_control = { 154 null_control_function, 155 null_control_function, 156 null_control_function, 157 null_control_name 158 }; 159 160 161 int hci_send_acl_packet(uint8_t *packet, int size){ 162 hci_connection_update_timestamp_for_acl(packet); 163 return hci_stack.hci_transport->send_acl_packet(packet, size); 164 } 165 166 static void acl_handler(uint8_t *packet, int size){ 167 hci_connection_update_timestamp_for_acl(packet); 168 hci_stack.acl_packet_handler(packet, size); 169 170 // execute main loop 171 hci_run(); 172 } 173 174 static void event_handler(uint8_t *packet, int size){ 175 bd_addr_t addr; 176 hci_con_handle_t handle; 177 178 // Get Num_HCI_Command_Packets 179 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE || 180 packet[0] == HCI_EVENT_COMMAND_STATUS){ 181 hci_stack.num_cmd_packets = packet[2]; 182 } 183 184 // Connection management 185 if (packet[0] == HCI_EVENT_CONNECTION_COMPLETE) { 186 if (!packet[2]){ 187 bt_flip_addr(addr, &packet[5]); 188 printf("Connection_complete "); print_bd_addr(addr); printf("\n"); 189 hci_connection_t * conn = connection_for_address(addr); 190 if (conn) { 191 conn->state = OPEN; 192 conn->con_handle = READ_BT_16(packet, 3); 193 conn->flags = 0; 194 195 gettimeofday(&conn->timestamp, NULL); 196 run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT); 197 run_loop_add_timer(&conn->timeout); 198 199 printf("New connection: handle %u, ", conn->con_handle); 200 print_bd_addr( conn->address ); 201 printf("\n"); 202 203 hci_emit_nr_connections_changed(); 204 } 205 } 206 } 207 208 if (packet[0] == HCI_EVENT_DISCONNECTION_COMPLETE) { 209 if (!packet[2]){ 210 handle = READ_BT_16(packet, 3); 211 hci_connection_t * conn = connection_for_handle(handle); 212 if (conn) { 213 printf("Connection closed: handle %u, ", conn->con_handle); 214 print_bd_addr( conn->address ); 215 printf("\n"); 216 run_loop_remove_timer(&conn->timeout); 217 linked_list_remove(&hci_stack.connections, (linked_item_t *) conn); 218 free( conn ); 219 hci_emit_nr_connections_changed(); 220 } 221 } 222 } 223 224 // handle BT initialization 225 if (hci_stack.state == HCI_STATE_INITIALIZING){ 226 // handle H4 synchronization loss on restart 227 // if (hci_stack.substate == 1 && packet[0] == HCI_EVENT_HARDWARE_ERROR){ 228 // hci_stack.substate = 0; 229 // } 230 // handle normal init sequence 231 if (hci_stack.substate % 2){ 232 // odd: waiting for event 233 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE){ 234 hci_stack.substate++; 235 } 236 } 237 } 238 239 // link key request 240 if (packet[0] == HCI_EVENT_LINK_KEY_REQUEST){ 241 bt_flip_addr(addr, &packet[2]); 242 hci_send_cmd(&hci_link_key_request_negative_reply, &addr); 243 return; 244 } 245 246 hci_stack.event_packet_handler(packet, size); 247 248 // execute main loop 249 hci_run(); 250 } 251 252 /** Register HCI packet handlers */ 253 void hci_register_event_packet_handler(void (*handler)(uint8_t *packet, uint16_t size)){ 254 hci_stack.event_packet_handler = handler; 255 } 256 void hci_register_acl_packet_handler (void (*handler)(uint8_t *packet, uint16_t size)){ 257 hci_stack.acl_packet_handler = handler; 258 } 259 260 void hci_init(hci_transport_t *transport, void *config, bt_control_t *control){ 261 262 // reference to use transport layer implementation 263 hci_stack.hci_transport = transport; 264 265 // references to used control implementation 266 if (control) { 267 hci_stack.control = control; 268 } else { 269 hci_stack.control = &null_control; 270 } 271 272 // reference to used config 273 hci_stack.config = config; 274 275 // no connections yet 276 hci_stack.connections = NULL; 277 278 // empty cmd buffer 279 hci_stack.hci_cmd_buffer = malloc(3+255); 280 281 // higher level handler 282 hci_stack.event_packet_handler = dummy_handler; 283 hci_stack.acl_packet_handler = dummy_handler; 284 285 // register packet handlers with transport 286 transport->register_event_packet_handler( event_handler); 287 transport->register_acl_packet_handler( acl_handler); 288 } 289 290 int hci_power_control(HCI_POWER_MODE power_mode){ 291 if (power_mode == HCI_POWER_ON && hci_stack.state == HCI_STATE_OFF) { 292 293 // power on 294 int err = hci_stack.control->on(hci_stack.config); 295 if (err){ 296 fprintf(stderr, "POWER_ON failed\n"); 297 hci_emit_hci_open_failed(); 298 return err; 299 } 300 301 // open low-level device 302 err = hci_stack.hci_transport->open(hci_stack.config); 303 if (err){ 304 fprintf(stderr, "HCI_INIT failed, turning Bluetooth off again\n"); 305 hci_stack.control->off(hci_stack.config); 306 hci_emit_hci_open_failed(); 307 return err; 308 } 309 310 // set up state machine 311 hci_stack.num_cmd_packets = 1; // assume that one cmd can be sent 312 hci_stack.state = HCI_STATE_INITIALIZING; 313 hci_stack.substate = 0; 314 315 } else if (power_mode == HCI_POWER_OFF && hci_stack.state == HCI_STATE_WORKING){ 316 317 // close low-level device 318 hci_stack.hci_transport->close(hci_stack.config); 319 320 // power off 321 hci_stack.control->off(hci_stack.config); 322 323 // we're off now 324 hci_stack.state = HCI_STATE_OFF; 325 } 326 327 // create internal event 328 hci_emit_state(); 329 330 // trigger next/first action 331 hci_run(); 332 333 return 0; 334 } 335 336 void hci_run(){ 337 switch (hci_stack.state){ 338 case HCI_STATE_INITIALIZING: 339 if (hci_stack.substate % 2) { 340 // odd: waiting for command completion 341 return; 342 } 343 if (hci_stack.num_cmd_packets == 0) { 344 // cannot send command yet 345 return; 346 } 347 switch (hci_stack.substate/2){ 348 case 0: 349 hci_send_cmd(&hci_reset); 350 break; 351 case 1: 352 hci_send_cmd(&hci_read_bd_addr); 353 break; 354 case 2: 355 // ca. 15 sec 356 hci_send_cmd(&hci_write_page_timeout, 0x6000); 357 break; 358 case 3: 359 hci_send_cmd(&hci_write_scan_enable, 3); // 3 inq scan + page scan 360 break; 361 case 4: 362 // done. 363 hci_stack.state = HCI_STATE_WORKING; 364 hci_emit_state(); 365 break; 366 default: 367 break; 368 } 369 hci_stack.substate++; 370 break; 371 default: 372 break; 373 } 374 } 375 376 int hci_send_cmd_packet(uint8_t *packet, int size){ 377 bd_addr_t addr; 378 hci_connection_t * conn; 379 // house-keeping 380 381 // create_connection? 382 if (IS_COMMAND(packet, hci_create_connection)){ 383 bt_flip_addr(addr, &packet[3]); 384 printf("Create_connection to "); print_bd_addr(addr); printf("\n"); 385 conn = connection_for_address(addr); 386 if (conn) { 387 // if connection exists 388 if (conn->state == OPEN) { 389 // if OPEN, emit connection complete command 390 hci_emit_connection_complete(conn); 391 } 392 // otherwise, just ignore 393 return 0; // don't sent packet to controller 394 395 } else{ 396 conn = create_connection_for_addr(addr); 397 if (conn){ 398 // create connection struct and register, state = SENT_CREATE_CONNECTION 399 conn->state = SENT_CREATE_CONNECTION; 400 } 401 } 402 } 403 404 // accept connection 405 406 // reject connection 407 408 // close_connection? 409 // set state = SENT_DISCONNECT 410 411 hci_stack.num_cmd_packets--; 412 return hci_stack.hci_transport->send_cmd_packet(packet, size); 413 } 414 415 /** 416 * pre: numcmds >= 0 - it's allowed to send a command to the controller 417 */ 418 int hci_send_cmd(hci_cmd_t *cmd, ...){ 419 va_list argptr; 420 va_start(argptr, cmd); 421 uint8_t * hci_cmd_buffer = hci_stack.hci_cmd_buffer; 422 uint16_t size = hci_create_cmd_internal(hci_stack.hci_cmd_buffer, cmd, argptr); 423 va_end(argptr); 424 return hci_send_cmd_packet(hci_cmd_buffer, size); 425 } 426 427 // Create various non-HCI events. 428 // TODO: generalize, use table similar to hci_create_command 429 430 void hci_emit_state(){ 431 uint8_t len = 3; 432 uint8_t event[len]; 433 event[0] = BTSTACK_EVENT_STATE; 434 event[1] = 1; 435 event[2] = hci_stack.state; 436 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 437 hci_stack.event_packet_handler(event, len); 438 } 439 440 void hci_emit_connection_complete(hci_connection_t *conn){ 441 uint8_t len = 13; 442 uint8_t event[len]; 443 event[0] = HCI_EVENT_CONNECTION_COMPLETE; 444 event[2] = 0; // status = OK 445 bt_store_16(event, 3, conn->con_handle); 446 bt_flip_addr(&event[5], conn->address); 447 event[11] = 1; // ACL connection 448 event[12] = 0; // encryption disabled 449 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 450 hci_stack.event_packet_handler(event, len); 451 } 452 453 void hci_emit_l2cap_check_timeout(hci_connection_t *conn){ 454 uint8_t len = 4; 455 uint8_t event[len]; 456 event[0] = L2CAP_EVENT_TIMEOUT_CHECK; 457 event[1] = 2; 458 bt_store_16(event, 2, conn->con_handle); 459 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 460 hci_stack.event_packet_handler(event, len); 461 } 462 463 void hci_emit_nr_connections_changed(){ 464 uint8_t len = 3; 465 uint8_t event[len]; 466 event[0] = BTSTACK_EVENT_NR_CONNECTIONS_CHANGED; 467 event[1] = 1; 468 event[2] = nr_hci_connections(); 469 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 470 hci_stack.event_packet_handler(event, len); 471 } 472 473 void hci_emit_hci_open_failed(){ 474 uint8_t len = 1; 475 uint8_t event[len]; 476 event[0] = BTSTACK_EVENT_POWERON_FAILED; 477 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 478 hci_stack.event_packet_handler(event, len); 479 } 480