1 /* 2 * hci.c 3 * 4 * Created by Matthias Ringwald on 4/29/09. 5 * 6 */ 7 8 #include <unistd.h> 9 #include <stdarg.h> 10 #include <string.h> 11 #include <stdio.h> 12 #include "hci.h" 13 #include "hci_dump.h" 14 15 // temp 16 #include "l2cap.h" 17 18 #define HCI_CONNECTION_TIMEOUT 10 19 20 // the STACK is here 21 static hci_stack_t hci_stack; 22 23 /** 24 * get connection for a given handle 25 * 26 * @return connection OR NULL, if not found 27 */ 28 static hci_connection_t * connection_for_handle(hci_con_handle_t con_handle){ 29 linked_item_t *it; 30 for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next){ 31 if ( ((hci_connection_t *) it)->con_handle == con_handle){ 32 return (hci_connection_t *) it; 33 } 34 } 35 return NULL; 36 } 37 38 static void hci_connection_timeout_handler(timer_t *timer){ 39 hci_connection_t * connection = linked_item_get_user(&timer->item); 40 struct timeval tv; 41 gettimeofday(&tv, NULL); 42 if (tv.tv_sec > connection->timestamp.tv_sec + HCI_CONNECTION_TIMEOUT) { 43 // connections might be timed out 44 hci_emit_l2cap_check_timeout(connection); 45 run_loop_set_timer(timer, HCI_CONNECTION_TIMEOUT); 46 } else { 47 // next timeout check at 48 timer->timeout.tv_sec = connection->timestamp.tv_sec + HCI_CONNECTION_TIMEOUT; 49 } 50 run_loop_add_timer(timer); 51 } 52 53 static void hci_connection_timestamp(hci_connection_t *connection){ 54 gettimeofday(&connection->timestamp, NULL); 55 } 56 57 static void hci_connection_update_timestamp_for_acl(uint8_t *packet) { 58 // update timestamp 59 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 60 hci_connection_t *connection = connection_for_handle( con_handle); 61 if (connection) hci_connection_timestamp(connection); 62 } 63 64 /** 65 * create connection for given address 66 * 67 * @return connection OR NULL, if not found 68 */ 69 static hci_connection_t * create_connection_for_addr(bd_addr_t addr){ 70 hci_connection_t * conn = malloc( sizeof(hci_connection_t) ); 71 if (!conn) return NULL; 72 BD_ADDR_COPY(conn->address, addr); 73 conn->con_handle = 0xffff; 74 conn->flags = 0; 75 linked_item_set_user(&conn->timeout.item, conn); 76 conn->timeout.process = hci_connection_timeout_handler; 77 hci_connection_timestamp(conn); 78 linked_list_add(&hci_stack.connections, (linked_item_t *) conn); 79 return conn; 80 } 81 82 /** 83 * get connection for given address 84 * 85 * @return connection OR NULL, if not found 86 */ 87 static hci_connection_t * connection_for_address(bd_addr_t address){ 88 linked_item_t *it; 89 for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next){ 90 if ( ! BD_ADDR_CMP( ((hci_connection_t *) it)->address, address) ){ 91 return (hci_connection_t *) it; 92 } 93 } 94 return NULL; 95 } 96 97 /** 98 * count connections 99 */ 100 static int nr_hci_connections(){ 101 int count = 0; 102 linked_item_t *it; 103 for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next, count++); 104 return count; 105 } 106 107 /** 108 * Dummy handler called by HCI 109 */ 110 static void dummy_handler(uint8_t *packet, uint16_t size){ 111 } 112 113 /** 114 * Dummy control handler 115 */ 116 static int null_control_function(void *config){ 117 return 0; 118 } 119 static const char * null_control_name(void *config){ 120 return "Hardware unknown"; 121 } 122 static bt_control_t null_control = { 123 null_control_function, 124 null_control_function, 125 null_control_function, 126 null_control_name 127 }; 128 129 130 int hci_send_acl_packet(uint8_t *packet, int size){ 131 hci_connection_update_timestamp_for_acl(packet); 132 return hci_stack.hci_transport->send_acl_packet(packet, size); 133 } 134 135 static void acl_handler(uint8_t *packet, int size){ 136 hci_connection_update_timestamp_for_acl(packet); 137 hci_stack.acl_packet_handler(packet, size); 138 139 // execute main loop 140 hci_run(); 141 } 142 143 static void event_handler(uint8_t *packet, int size){ 144 bd_addr_t addr; 145 hci_con_handle_t handle; 146 147 // Get Num_HCI_Command_Packets 148 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE || 149 packet[0] == HCI_EVENT_COMMAND_STATUS){ 150 hci_stack.num_cmd_packets = packet[2]; 151 } 152 153 // Connection management 154 if (packet[0] == HCI_EVENT_CONNECTION_COMPLETE) { 155 if (!packet[2]){ 156 bt_flip_addr(addr, &packet[5]); 157 printf("Connection_complete "); print_bd_addr(addr); printf("\n"); 158 hci_connection_t * conn = connection_for_address(addr); 159 if (conn) { 160 conn->state = OPEN; 161 conn->con_handle = READ_BT_16(packet, 3); 162 conn->flags = 0; 163 164 gettimeofday(&conn->timestamp, NULL); 165 run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT); 166 run_loop_add_timer(&conn->timeout); 167 168 printf("New connection: handle %u, ", conn->con_handle); 169 print_bd_addr( conn->address ); 170 printf("\n"); 171 172 hci_emit_nr_connections_changed(); 173 } 174 } 175 } 176 177 if (packet[0] == HCI_EVENT_DISCONNECTION_COMPLETE) { 178 if (!packet[2]){ 179 handle = READ_BT_16(packet, 3); 180 hci_connection_t * conn = connection_for_handle(handle); 181 if (conn) { 182 printf("Connection closed: handle %u, ", conn->con_handle); 183 print_bd_addr( conn->address ); 184 printf("\n"); 185 run_loop_remove_timer(&conn->timeout); 186 linked_list_remove(&hci_stack.connections, (linked_item_t *) conn); 187 free( conn ); 188 hci_emit_nr_connections_changed(); 189 } 190 } 191 } 192 193 // handle BT initialization 194 if (hci_stack.state == HCI_STATE_INITIALIZING){ 195 // handle H4 synchronization loss on restart 196 // if (hci_stack.substate == 1 && packet[0] == HCI_EVENT_HARDWARE_ERROR){ 197 // hci_stack.substate = 0; 198 // } 199 // handle normal init sequence 200 if (hci_stack.substate % 2){ 201 // odd: waiting for event 202 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE){ 203 hci_stack.substate++; 204 } 205 } 206 } 207 208 // link key request 209 if (packet[0] == HCI_EVENT_LINK_KEY_REQUEST){ 210 bt_flip_addr(addr, &packet[2]); 211 hci_send_cmd(&hci_link_key_request_negative_reply, &addr); 212 return; 213 } 214 215 hci_stack.event_packet_handler(packet, size); 216 217 // execute main loop 218 hci_run(); 219 } 220 221 /** Register HCI packet handlers */ 222 void hci_register_event_packet_handler(void (*handler)(uint8_t *packet, uint16_t size)){ 223 hci_stack.event_packet_handler = handler; 224 } 225 void hci_register_acl_packet_handler (void (*handler)(uint8_t *packet, uint16_t size)){ 226 hci_stack.acl_packet_handler = handler; 227 } 228 229 void hci_init(hci_transport_t *transport, void *config, bt_control_t *control){ 230 231 // reference to use transport layer implementation 232 hci_stack.hci_transport = transport; 233 234 // references to used control implementation 235 if (control) { 236 hci_stack.control = control; 237 } else { 238 hci_stack.control = &null_control; 239 } 240 241 // reference to used config 242 hci_stack.config = config; 243 244 // no connections yet 245 hci_stack.connections = NULL; 246 247 // empty cmd buffer 248 hci_stack.hci_cmd_buffer = malloc(3+255); 249 250 // higher level handler 251 hci_stack.event_packet_handler = dummy_handler; 252 hci_stack.acl_packet_handler = dummy_handler; 253 254 // register packet handlers with transport 255 transport->register_event_packet_handler( event_handler); 256 transport->register_acl_packet_handler( acl_handler); 257 } 258 259 int hci_power_control(HCI_POWER_MODE power_mode){ 260 if (power_mode == HCI_POWER_ON && hci_stack.state == HCI_STATE_OFF) { 261 262 // power on 263 int err = hci_stack.control->on(hci_stack.config); 264 if (err){ 265 fprintf(stderr, "POWER_ON failed\n"); 266 hci_emit_hci_open_failed(); 267 return err; 268 } 269 270 // open low-level device 271 err = hci_stack.hci_transport->open(hci_stack.config); 272 if (err){ 273 fprintf(stderr, "HCI_INIT failed, turning Bluetooth off again\n"); 274 hci_stack.control->off(hci_stack.config); 275 hci_emit_hci_open_failed(); 276 return err; 277 } 278 279 // set up state machine 280 hci_stack.num_cmd_packets = 1; // assume that one cmd can be sent 281 hci_stack.state = HCI_STATE_INITIALIZING; 282 hci_stack.substate = 0; 283 284 } else if (power_mode == HCI_POWER_OFF && hci_stack.state == HCI_STATE_WORKING){ 285 286 // close low-level device 287 hci_stack.hci_transport->close(hci_stack.config); 288 289 // power off 290 hci_stack.control->off(hci_stack.config); 291 292 // we're off now 293 hci_stack.state = HCI_STATE_OFF; 294 } 295 296 // create internal event 297 hci_emit_state(); 298 299 // trigger next/first action 300 hci_run(); 301 302 return 0; 303 } 304 305 void hci_run(){ 306 uint8_t micro_packet; 307 switch (hci_stack.state){ 308 case HCI_STATE_INITIALIZING: 309 if (hci_stack.substate % 2) { 310 // odd: waiting for command completion 311 return; 312 } 313 if (hci_stack.num_cmd_packets == 0) { 314 // cannot send command yet 315 return; 316 } 317 switch (hci_stack.substate/2){ 318 case 0: 319 hci_send_cmd(&hci_reset); 320 break; 321 case 1: 322 hci_send_cmd(&hci_read_bd_addr); 323 break; 324 case 2: 325 // ca. 15 sec 326 hci_send_cmd(&hci_write_page_timeout, 0x6000); 327 break; 328 case 3: 329 hci_send_cmd(&hci_write_scan_enable, 3); // 3 inq scan + page scan 330 break; 331 case 4: 332 // done. 333 hci_stack.state = HCI_STATE_WORKING; 334 hci_emit_state(); 335 break; 336 default: 337 break; 338 } 339 hci_stack.substate++; 340 break; 341 default: 342 break; 343 } 344 } 345 346 int hci_send_cmd_packet(uint8_t *packet, int size){ 347 bd_addr_t addr; 348 hci_connection_t * conn; 349 // house-keeping 350 351 // create_connection? 352 if (IS_COMMAND(packet, hci_create_connection)){ 353 bt_flip_addr(addr, &packet[3]); 354 printf("Create_connection to "); print_bd_addr(addr); printf("\n"); 355 conn = connection_for_address(addr); 356 if (conn) { 357 // if connection exists 358 if (conn->state == OPEN) { 359 // if OPEN, emit connection complete command 360 hci_emit_connection_complete(conn); 361 } 362 // otherwise, just ignore 363 return 0; // don't sent packet to controller 364 365 } else{ 366 conn = create_connection_for_addr(addr); 367 if (conn){ 368 // create connection struct and register, state = SENT_CREATE_CONNECTION 369 conn->state = SENT_CREATE_CONNECTION; 370 } 371 } 372 } 373 374 // accept connection 375 376 // reject connection 377 378 // close_connection? 379 // set state = SENT_DISCONNECT 380 381 hci_stack.num_cmd_packets--; 382 return hci_stack.hci_transport->send_cmd_packet(packet, size); 383 } 384 385 /** 386 * pre: numcmds >= 0 - it's allowed to send a command to the controller 387 */ 388 int hci_send_cmd(hci_cmd_t *cmd, ...){ 389 va_list argptr; 390 va_start(argptr, cmd); 391 uint8_t * hci_cmd_buffer = hci_stack.hci_cmd_buffer; 392 uint16_t size = hci_create_cmd_internal(hci_stack.hci_cmd_buffer, cmd, argptr); 393 va_end(argptr); 394 return hci_send_cmd_packet(hci_cmd_buffer, size); 395 } 396 397 // Create various non-HCI events. 398 // TODO: generalize, use table similar to hci_create_command 399 400 void hci_emit_state(){ 401 uint8_t len = 3; 402 uint8_t event[len]; 403 event[0] = BTSTACK_EVENT_STATE; 404 event[1] = 1; 405 event[2] = hci_stack.state; 406 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 407 hci_stack.event_packet_handler(event, len); 408 } 409 410 void hci_emit_connection_complete(hci_connection_t *conn){ 411 uint8_t len = 13; 412 uint8_t event[len]; 413 event[0] = HCI_EVENT_CONNECTION_COMPLETE; 414 event[2] = 0; // status = OK 415 bt_store_16(event, 3, conn->con_handle); 416 bt_flip_addr(&event[5], conn->address); 417 event[11] = 1; // ACL connection 418 event[12] = 0; // encryption disabled 419 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 420 hci_stack.event_packet_handler(event, len); 421 } 422 423 void hci_emit_l2cap_check_timeout(hci_connection_t *conn){ 424 uint8_t len = 4; 425 uint8_t event[len]; 426 event[0] = L2CAP_EVENT_TIMEOUT_CHECK; 427 event[1] = 2; 428 bt_store_16(event, 2, conn->con_handle); 429 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 430 hci_stack.event_packet_handler(event, len); 431 } 432 433 void hci_emit_nr_connections_changed(){ 434 uint8_t len = 3; 435 uint8_t event[len]; 436 event[0] = BTSTACK_EVENT_NR_CONNECTIONS_CHANGED; 437 event[1] = 1; 438 event[2] = nr_hci_connections(); 439 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 440 hci_stack.event_packet_handler(event, len); 441 } 442 443 void hci_emit_hci_open_failed(){ 444 uint8_t len = 1; 445 uint8_t event[len]; 446 event[0] = BTSTACK_EVENT_POWERON_FAILED; 447 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 448 hci_stack.event_packet_handler(event, len); 449 } 450