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 14 // calculate combined ogf/ocf value 15 #define OPCODE(ogf, ocf) (ocf | ogf << 10) 16 #define OGF_LINK_CONTROL 0x01 17 #define OGF_CONTROLLER_BASEBAND 0x03 18 19 hci_cmd_t hci_inquiry = { 20 OPCODE(OGF_LINK_CONTROL, 0x01), "311" 21 // LAP, Inquiry length, Num_responses 22 }; 23 24 hci_cmd_t hci_link_key_request_negative_reply = { 25 OPCODE(OGF_LINK_CONTROL, 0x0c), "B" 26 }; 27 28 hci_cmd_t hci_pin_code_request_reply = { 29 OPCODE(OGF_LINK_CONTROL, 0x0d), "B1P" 30 // BD_ADDR, pin length, PIN: c-string 31 }; 32 33 hci_cmd_t hci_reset = { 34 OPCODE(OGF_CONTROLLER_BASEBAND, 0x03), "" 35 }; 36 37 hci_cmd_t hci_create_connection = { 38 OPCODE(OGF_LINK_CONTROL, 0x05), "B21121" 39 // BD_ADDR, Packet_Type, Page_Scan_Repetition_Mode, Reserved, Clock_Offset, Allow_Role_Switch 40 }; 41 42 hci_cmd_t hci_write_page_timeout = { 43 OPCODE(OGF_CONTROLLER_BASEBAND, 0x18), "2" 44 // Page_Timeout * 0.625 ms 45 }; 46 47 hci_cmd_t hci_write_authentication_enable = { 48 OPCODE(OGF_CONTROLLER_BASEBAND, 0x20), "1" 49 // Authentication_Enable 50 }; 51 52 hci_cmd_t hci_host_buffer_size = { 53 OPCODE(OGF_CONTROLLER_BASEBAND, 0x33), "2122" 54 // Host_ACL_Data_Packet_Length:, Host_Synchronous_Data_Packet_Length:, Host_Total_Num_ACL_Data_Packets:, Host_Total_Num_Synchronous_Data_Packets: 55 }; 56 57 58 // the stack is here 59 static hci_stack_t hci_stack; 60 61 62 void bt_store_16(uint8_t *buffer, uint16_t pos, uint16_t value){ 63 buffer[pos] = value & 0xff; 64 buffer[pos+1] = value >> 8; 65 } 66 67 void bt_flip_addr(bd_addr_t dest, bd_addr_t src){ 68 dest[0] = src[5]; 69 dest[1] = src[4]; 70 dest[2] = src[3]; 71 dest[3] = src[2]; 72 dest[4] = src[1]; 73 dest[5] = src[0]; 74 } 75 76 void hexdump(void *data, int size){ 77 int i; 78 for (i=0; i<size;i++){ 79 printf("%02X ", ((uint8_t *)data)[i]); 80 } 81 printf("\n"); 82 } 83 84 #if 0 85 static void *hci_daemon_thread(void *arg){ 86 printf("HCI Daemon started\n"); 87 hci_run(transport, &config); 88 return NULL; 89 } 90 #endif 91 92 /** 93 * Linked link list 94 */ 95 96 /** 97 * get link for given address 98 * 99 * @return connection OR NULL, if not found 100 */ 101 #if 0 102 static hci_connection_t *link_for_addr(bd_addr_t addr){ 103 return NULL; 104 } 105 #endif 106 107 /** 108 * Handler called by HCI transport 109 */ 110 static void dummy_handler(uint8_t *packet, int size){ 111 } 112 113 static void acl_handler(uint8_t *packet, int size){ 114 hci_stack.acl_packet_handler(packet, size); 115 } 116 117 static void event_handler(uint8_t *packet, int size){ 118 bd_addr_t addr; 119 120 // Get Num_HCI_Command_Packets 121 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE || 122 packet[0] == HCI_EVENT_COMMAND_STATUS){ 123 hci_stack.num_cmd_packets = packet[2]; 124 } 125 126 // handle BT initialization 127 if (hci_stack.state == HCI_STATE_INITIALIZING){ 128 if (hci_stack.substate % 2){ 129 // odd: waiting for event 130 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE){ 131 hci_stack.substate++; 132 } 133 } 134 } 135 136 // link key request 137 if (packet[0] == HCI_EVENT_LINK_KEY_REQUEST){ 138 bt_flip_addr(addr, &packet[2]); 139 hci_send_cmd(&hci_link_key_request_negative_reply, &addr); 140 return; 141 } 142 143 // pin code request 144 if (packet[0] == HCI_EVENT_PIN_CODE_REQUEST){ 145 bt_flip_addr(addr, &packet[2]); 146 hci_send_cmd(&hci_pin_code_request_reply, &addr, 4, "1234"); 147 } 148 149 hci_stack.event_packet_handler(packet, size); 150 } 151 152 /** Register L2CAP handlers */ 153 void hci_register_event_packet_handler(void (*handler)(uint8_t *packet, int size)){ 154 hci_stack.event_packet_handler = handler; 155 } 156 void hci_register_acl_packet_handler (void (*handler)(uint8_t *packet, int size)){ 157 hci_stack.acl_packet_handler = handler; 158 } 159 160 void hci_init(hci_transport_t *transport, void *config, bt_control_t *control){ 161 162 // reference to use transport layer implementation 163 hci_stack.hci_transport = transport; 164 165 // references to used control implementation 166 hci_stack.control = control; 167 168 // reference to used config 169 hci_stack.config = config; 170 171 // empty cmd buffer 172 hci_stack.hci_cmd_buffer = malloc(3+255); 173 174 // set up state 175 hci_stack.num_cmd_packets = 1; // assume that one cmd can be sent 176 hci_stack.state = HCI_STATE_INITIALIZING; 177 hci_stack.substate = 0; 178 179 // higher level handler 180 hci_stack.event_packet_handler = dummy_handler; 181 hci_stack.acl_packet_handler = dummy_handler; 182 183 // register packet handlers with transport 184 transport->register_event_packet_handler( event_handler); 185 transport->register_acl_packet_handler( acl_handler); 186 187 // turn on 188 hci_power_control(HCI_POWER_ON); 189 190 // open low-level device 191 transport->open(config); 192 } 193 194 int hci_power_control(HCI_POWER_MODE power_mode){ 195 if (hci_stack.control) { 196 if (power_mode == HCI_POWER_ON) { 197 hci_stack.control->on(hci_stack.config); 198 } else if (power_mode == HCI_POWER_OFF){ 199 hci_stack.control->off(hci_stack.config); 200 } 201 } 202 return 0; 203 } 204 205 uint32_t hci_run(){ 206 uint8_t micro_packet; 207 switch (hci_stack.state){ 208 case HCI_STATE_INITIALIZING: 209 if (hci_stack.substate % 2) { 210 // odd: waiting for command completion 211 return 0; 212 } 213 if (hci_stack.num_cmd_packets == 0) { 214 // cannot send command yet 215 return 0; 216 } 217 switch (hci_stack.substate/2){ 218 case 0: 219 hci_send_cmd(&hci_reset); 220 break; 221 case 1: 222 // ca. 15 sec 223 hci_send_cmd(&hci_write_page_timeout, 0x6000); 224 break; 225 case 2: 226 // done. 227 hci_stack.state = HCI_STATE_WORKING; 228 micro_packet = BTSTACK_EVENT_HCI_WORKING; 229 hci_stack.event_packet_handler(µ_packet, 1); 230 break; 231 default: 232 break; 233 } 234 hci_stack.substate++; 235 break; 236 default: 237 break; 238 } 239 240 // don't check for timetous yet 241 return 0; 242 } 243 244 245 int hci_send_acl_packet(uint8_t *packet, int size){ 246 return hci_stack.hci_transport->send_acl_packet(packet, size); 247 } 248 249 250 /** 251 * pre: numcmds >= 0 - it's allowed to send a command to the controller 252 */ 253 int hci_send_cmd(hci_cmd_t *cmd, ...){ 254 uint8_t * hci_cmd_buffer = hci_stack.hci_cmd_buffer; 255 hci_cmd_buffer[0] = cmd->opcode & 0xff; 256 hci_cmd_buffer[1] = cmd->opcode >> 8; 257 int pos = 3; 258 259 va_list argptr; 260 va_start(argptr, cmd); 261 const char *format = cmd->format; 262 uint16_t word; 263 uint32_t longword; 264 uint8_t * ptr; 265 while (*format) { 266 switch(*format) { 267 case '1': // 8 bit value 268 case '2': // 16 bit value 269 case 'H': // hci_handle 270 word = va_arg(argptr, int); // minimal va_arg is int: 2 bytes on 8+16 bit CPUs 271 hci_cmd_buffer[pos++] = word & 0xff; 272 if (*format == '2') { 273 hci_cmd_buffer[pos++] = word >> 8; 274 } else if (*format == 'H') { 275 // TODO 276 } 277 break; 278 case '3': 279 case '4': 280 longword = va_arg(argptr, uint32_t); 281 // longword = va_arg(argptr, int); 282 hci_cmd_buffer[pos++] = longword; 283 hci_cmd_buffer[pos++] = longword >> 8; 284 hci_cmd_buffer[pos++] = longword >> 16; 285 if (*format == '4'){ 286 hci_cmd_buffer[pos++] = longword >> 24; 287 } 288 break; 289 case 'B': // bt-addr 290 ptr = va_arg(argptr, uint8_t *); 291 hci_cmd_buffer[pos++] = ptr[5]; 292 hci_cmd_buffer[pos++] = ptr[4]; 293 hci_cmd_buffer[pos++] = ptr[3]; 294 hci_cmd_buffer[pos++] = ptr[2]; 295 hci_cmd_buffer[pos++] = ptr[1]; 296 hci_cmd_buffer[pos++] = ptr[0]; 297 break; 298 case 'P': // c string passed as pascal string with leading 1-byte len 299 ptr = va_arg(argptr, uint8_t *); 300 memcpy(&hci_cmd_buffer[pos], ptr, 16); 301 pos += 16; 302 break; 303 default: 304 break; 305 } 306 format++; 307 }; 308 va_end(argptr); 309 hci_cmd_buffer[2] = pos - 3; 310 // send packet 311 hci_stack.num_cmd_packets--; 312 return hci_stack.hci_transport->send_cmd_packet(hci_cmd_buffer, pos); 313 }