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 // the STACK is here 19 static hci_stack_t hci_stack; 20 21 /** 22 * create connection for given address 23 * 24 * @return connection OR NULL, if not found 25 */ 26 static hci_connection_t * create_connection_for_addr(bd_addr_t addr){ 27 hci_connection_t * conn = malloc( sizeof(hci_connection_t) ); 28 if (!conn) return NULL; 29 BD_ADDR_COPY(conn->address, addr); 30 conn->con_handle = 0xffff; 31 conn->flags = 0; 32 linked_list_add(&hci_stack.connections, (linked_item_t *) conn); 33 return conn; 34 } 35 36 /** 37 * get connection for given address 38 * 39 * @return connection OR NULL, if not found 40 */ 41 static hci_connection_t * connection_for_address(bd_addr_t address){ 42 linked_item_t *it; 43 for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next){ 44 if ( ! BD_ADDR_CMP( ((hci_connection_t *) it)->address, address) ){ 45 return (hci_connection_t *) it; 46 } 47 } 48 return NULL; 49 } 50 51 /** 52 * get connection for a given handle 53 * 54 * @return connection OR NULL, if not found 55 */ 56 static hci_connection_t * connection_for_handle(hci_con_handle_t con_handle){ 57 linked_item_t *it; 58 for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next){ 59 if ( ((hci_connection_t *) it)->con_handle == con_handle){ 60 return (hci_connection_t *) it; 61 } 62 } 63 return NULL; 64 } 65 66 67 /** 68 * Dummy handler called by HCI 69 */ 70 static void dummy_handler(uint8_t *packet, uint16_t size){ 71 } 72 73 /** 74 * Dummy control handler 75 */ 76 static int null_control_function(void *config){ 77 return 0; 78 } 79 static const char * null_control_name(void *config){ 80 return "Hardware unknown"; 81 } 82 static bt_control_t null_control = { 83 null_control_function, 84 null_control_function, 85 null_control_function, 86 null_control_name 87 }; 88 89 90 static void acl_handler(uint8_t *packet, int size){ 91 hci_stack.acl_packet_handler(packet, size); 92 93 // execute main loop 94 hci_run(); 95 } 96 97 static void event_handler(uint8_t *packet, int size){ 98 bd_addr_t addr; 99 hci_con_handle_t handle; 100 101 // Get Num_HCI_Command_Packets 102 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE || 103 packet[0] == HCI_EVENT_COMMAND_STATUS){ 104 hci_stack.num_cmd_packets = packet[2]; 105 } 106 107 // Connection management 108 if (packet[0] == HCI_EVENT_CONNECTION_COMPLETE) { 109 if (!packet[2]){ 110 bt_flip_addr(addr, &packet[5]); 111 printf("Connection_complete "); print_bd_addr(addr); printf("\n"); 112 hci_connection_t * conn = connection_for_address(addr); 113 if (conn) { 114 conn->state = OPEN; 115 conn->con_handle = READ_BT_16(packet, 3); 116 conn->flags = 0; 117 printf("New connection: handle %u, ", conn->con_handle); 118 print_bd_addr( conn->address ); 119 printf("\n"); 120 } 121 } 122 } 123 124 if (packet[0] == HCI_EVENT_DISCONNECTION_COMPLETE) { 125 if (!packet[2]){ 126 handle = READ_BT_16(packet, 3); 127 hci_connection_t * conn = connection_for_handle(handle); 128 if (conn) { 129 printf("Connection closed: handle %u, ", conn->con_handle); 130 print_bd_addr( conn->address ); 131 printf("\n"); 132 linked_list_remove(&hci_stack.connections, (linked_item_t *) conn); 133 free( conn ); 134 } 135 } 136 } 137 138 // handle BT initialization 139 if (hci_stack.state == HCI_STATE_INITIALIZING){ 140 // handle H4 synchronization loss on restart 141 // if (hci_stack.substate == 1 && packet[0] == HCI_EVENT_HARDWARE_ERROR){ 142 // hci_stack.substate = 0; 143 // } 144 // handle normal init sequence 145 if (hci_stack.substate % 2){ 146 // odd: waiting for event 147 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE){ 148 hci_stack.substate++; 149 } 150 } 151 } 152 153 // link key request 154 if (packet[0] == HCI_EVENT_LINK_KEY_REQUEST){ 155 bt_flip_addr(addr, &packet[2]); 156 hci_send_cmd(&hci_link_key_request_negative_reply, &addr); 157 return; 158 } 159 160 // pin code request 161 if (packet[0] == HCI_EVENT_PIN_CODE_REQUEST){ 162 bt_flip_addr(addr, &packet[2]); 163 hci_send_cmd(&hci_pin_code_request_reply, &addr, 4, "1234"); 164 } 165 166 hci_stack.event_packet_handler(packet, size); 167 168 // execute main loop 169 hci_run(); 170 } 171 172 /** Register HCI packet handlers */ 173 void hci_register_event_packet_handler(void (*handler)(uint8_t *packet, uint16_t size)){ 174 hci_stack.event_packet_handler = handler; 175 } 176 void hci_register_acl_packet_handler (void (*handler)(uint8_t *packet, uint16_t size)){ 177 hci_stack.acl_packet_handler = handler; 178 } 179 180 void hci_init(hci_transport_t *transport, void *config, bt_control_t *control){ 181 182 // reference to use transport layer implementation 183 hci_stack.hci_transport = transport; 184 185 // references to used control implementation 186 if (control) { 187 hci_stack.control = control; 188 } else { 189 hci_stack.control = &null_control; 190 } 191 192 // reference to used config 193 hci_stack.config = config; 194 195 // no connections yet 196 hci_stack.connections = NULL; 197 198 // empty cmd buffer 199 hci_stack.hci_cmd_buffer = malloc(3+255); 200 201 // higher level handler 202 hci_stack.event_packet_handler = dummy_handler; 203 hci_stack.acl_packet_handler = dummy_handler; 204 205 // register packet handlers with transport 206 transport->register_event_packet_handler( event_handler); 207 transport->register_acl_packet_handler( acl_handler); 208 } 209 210 int hci_power_control(HCI_POWER_MODE power_mode){ 211 if (power_mode == HCI_POWER_ON) { 212 213 // set up state machine 214 hci_stack.num_cmd_packets = 1; // assume that one cmd can be sent 215 hci_stack.state = HCI_STATE_INITIALIZING; 216 hci_stack.substate = 0; 217 218 // power on 219 hci_stack.control->on(hci_stack.config); 220 221 // open low-level device 222 hci_stack.hci_transport->open(hci_stack.config); 223 224 // create internal event 225 226 } else if (power_mode == HCI_POWER_OFF){ 227 228 // close low-level device 229 hci_stack.hci_transport->close(hci_stack.config); 230 231 // power off 232 hci_stack.control->off(hci_stack.config); 233 } 234 235 hci_emit_state(); 236 237 // trigger next/first action 238 hci_run(); 239 240 return 0; 241 } 242 243 void hci_run(){ 244 uint8_t micro_packet; 245 switch (hci_stack.state){ 246 case HCI_STATE_INITIALIZING: 247 if (hci_stack.substate % 2) { 248 // odd: waiting for command completion 249 return; 250 } 251 if (hci_stack.num_cmd_packets == 0) { 252 // cannot send command yet 253 return; 254 } 255 switch (hci_stack.substate/2){ 256 case 0: 257 hci_send_cmd(&hci_reset); 258 break; 259 case 1: 260 hci_send_cmd(&hci_read_bd_addr); 261 break; 262 case 2: 263 // ca. 15 sec 264 hci_send_cmd(&hci_write_page_timeout, 0x6000); 265 break; 266 case 3: 267 hci_send_cmd(&hci_write_scan_enable, 3); // 3 inq scan + page scan 268 break; 269 case 4: 270 // done. 271 hci_stack.state = HCI_STATE_WORKING; 272 micro_packet = HCI_EVENT_BTSTACK_WORKING; 273 hci_stack.event_packet_handler(µ_packet, 1); 274 break; 275 default: 276 break; 277 } 278 hci_stack.substate++; 279 break; 280 default: 281 break; 282 } 283 } 284 285 286 int hci_send_acl_packet(uint8_t *packet, int size){ 287 return hci_stack.hci_transport->send_acl_packet(packet, size); 288 } 289 290 int hci_send_cmd_packet(uint8_t *packet, int size){ 291 bd_addr_t addr; 292 hci_connection_t * conn; 293 // house-keeping 294 295 // create_connection? 296 if (IS_COMMAND(packet, hci_create_connection)){ 297 bt_flip_addr(addr, &packet[3]); 298 printf("Create_connection to "); print_bd_addr(addr); printf("\n"); 299 conn = connection_for_address(addr); 300 if (conn) { 301 // if connection exists 302 if (conn->state == OPEN) { 303 // if OPEN, emit connection complete command 304 hci_emit_connection_complete(conn); 305 } 306 // otherwise, just ignore 307 return 0; // don't sent packet to controller 308 309 } else{ 310 conn = create_connection_for_addr(addr); 311 if (conn){ 312 // create connection struct and register, state = SENT_CREATE_CONNECTION 313 conn->state = SENT_CREATE_CONNECTION; 314 } 315 } 316 } 317 318 // accept connection 319 320 // reject connection 321 322 // close_connection? 323 // set state = SENT_DISCONNECT 324 325 hci_stack.num_cmd_packets--; 326 return hci_stack.hci_transport->send_cmd_packet(packet, size); 327 } 328 329 /** 330 * pre: numcmds >= 0 - it's allowed to send a command to the controller 331 */ 332 int hci_send_cmd(hci_cmd_t *cmd, ...){ 333 va_list argptr; 334 va_start(argptr, cmd); 335 uint8_t * hci_cmd_buffer = hci_stack.hci_cmd_buffer; 336 uint16_t size = hci_create_cmd_internal(hci_stack.hci_cmd_buffer, cmd, argptr); 337 va_end(argptr); 338 return hci_send_cmd_packet(hci_cmd_buffer, size); 339 } 340 341 void hci_emit_state(){ 342 uint8_t len = 3; 343 uint8_t event[len]; 344 event[0] = HCI_EVENT_BTSTACK_STATE; 345 event[1] = 1; 346 event[2] = hci_stack.state; 347 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 348 hci_stack.event_packet_handler(event, len); 349 } 350 351 void hci_emit_connection_complete(hci_connection_t *conn){ 352 uint8_t len = 13; 353 uint8_t event[len]; 354 event[0] = HCI_EVENT_CONNECTION_COMPLETE; 355 event[2] = 0; // status = OK 356 bt_store_16(event, 3, conn->con_handle); 357 bt_flip_addr(&event[5], conn->address); 358 event[11] = 1; // ACL connection 359 event[12] = 0; // encryption disabled 360 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 361 hci_stack.event_packet_handler(event, len); 362 } 363 364