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