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(uint8_t *data, int size){ 77 int i; 78 for (i=0; i<size;i++){ 79 printf("%02X ", 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 static hci_connection_t *link_for_addr(bd_addr_t addr){ 102 return NULL; 103 } 104 105 /** 106 * Handler called by HCI transport 107 */ 108 static void dummy_handler(uint8_t *packet, int size){ 109 } 110 111 static void acl_handler(uint8_t *packet, int size){ 112 hci_stack.acl_packet_handler(packet, size); 113 } 114 115 static void event_handler(uint8_t *packet, int size){ 116 bd_addr_t addr; 117 118 // Get Num_HCI_Command_Packets 119 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE || 120 packet[0] == HCI_EVENT_COMMAND_STATUS){ 121 hci_stack.num_cmd_packets = packet[2]; 122 } 123 124 // handle BT initialization 125 if (hci_stack.state == HCI_STATE_INITIALIZING){ 126 if (hci_stack.substate % 2){ 127 // odd: waiting for event 128 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE){ 129 hci_stack.substate++; 130 } 131 } 132 } 133 134 // link key request 135 if (packet[0] == HCI_EVENT_LINK_KEY_REQUEST){ 136 bt_flip_addr(addr, &packet[2]); 137 hci_send_cmd(&hci_link_key_request_negative_reply, &addr); 138 return; 139 } 140 141 // pin code request 142 if (packet[0] == HCI_EVENT_PIN_CODE_REQUEST){ 143 bt_flip_addr(addr, &packet[2]); 144 hci_send_cmd(&hci_pin_code_request_reply, &addr, 4, "1234"); 145 } 146 147 hci_stack.event_packet_handler(packet, size); 148 } 149 150 /** Register L2CAP handlers */ 151 void hci_register_event_packet_handler(void (*handler)(uint8_t *packet, int size)){ 152 hci_stack.event_packet_handler = handler; 153 } 154 void hci_register_acl_packet_handler (void (*handler)(uint8_t *packet, int size)){ 155 hci_stack.acl_packet_handler = handler; 156 } 157 158 void hci_init(hci_transport_t *transport, void *config){ 159 160 // reference to use transport layer implementation 161 hci_stack.hci_transport = transport; 162 163 // empty cmd buffer 164 hci_stack.hci_cmd_buffer = malloc(3+255); 165 166 // set up state 167 hci_stack.num_cmd_packets = 1; // assume that one cmd can be sent 168 hci_stack.state = HCI_STATE_INITIALIZING; 169 hci_stack.substate = 0; 170 171 // higher level handler 172 hci_stack.event_packet_handler = dummy_handler; 173 hci_stack.acl_packet_handler = dummy_handler; 174 175 // register packet handlers with transport 176 transport->register_event_packet_handler( event_handler); 177 transport->register_acl_packet_handler( acl_handler); 178 179 // open low-level device 180 transport->open(config); 181 } 182 183 int hci_power_control(HCI_POWER_MODE power_mode){ 184 return 0; 185 } 186 187 uint32_t hci_run(){ 188 uint8_t micro_packet; 189 switch (hci_stack.state){ 190 case HCI_STATE_INITIALIZING: 191 if (hci_stack.substate % 2) { 192 // odd: waiting for command completion 193 return 0; 194 } 195 if (hci_stack.num_cmd_packets == 0) { 196 // cannot send command yet 197 return 0; 198 } 199 switch (hci_stack.substate/2){ 200 case 0: 201 hci_send_cmd(&hci_reset); 202 break; 203 case 1: 204 // ca. 15 sec 205 hci_send_cmd(&hci_write_page_timeout, 0x6000); 206 break; 207 case 2: 208 // done. 209 hci_stack.state = HCI_STATE_WORKING; 210 micro_packet = BTSTACK_EVENT_HCI_WORKING; 211 hci_stack.event_packet_handler(µ_packet, 1); 212 break; 213 default: 214 break; 215 } 216 hci_stack.substate++; 217 break; 218 default: 219 break; 220 } 221 222 // don't check for timetous yet 223 return 0; 224 } 225 226 227 int hci_send_acl_packet(uint8_t *packet, int size){ 228 return hci_stack.hci_transport->send_acl_packet(packet, size); 229 } 230 231 232 /** 233 * pre: numcmds >= 0 - it's allowed to send a command to the controller 234 */ 235 int hci_send_cmd(hci_cmd_t *cmd, ...){ 236 uint8_t * hci_cmd_buffer = hci_stack.hci_cmd_buffer; 237 hci_cmd_buffer[0] = cmd->opcode & 0xff; 238 hci_cmd_buffer[1] = cmd->opcode >> 8; 239 int pos = 3; 240 241 va_list argptr; 242 va_start(argptr, cmd); 243 const char *format = cmd->format; 244 uint16_t word; 245 uint32_t longword; 246 uint8_t * ptr; 247 while (*format) { 248 switch(*format) { 249 case '1': // 8 bit value 250 case '2': // 16 bit value 251 case 'H': // hci_handle 252 word = va_arg(argptr, int); // minimal va_arg is int: 2 bytes on 8+16 bit CPUs 253 hci_cmd_buffer[pos++] = word & 0xff; 254 if (*format == '2') { 255 hci_cmd_buffer[pos++] = word >> 8; 256 } else if (*format == 'H') { 257 // TODO 258 } 259 break; 260 case '3': 261 case '4': 262 longword = va_arg(argptr, uint32_t); 263 // longword = va_arg(argptr, int); 264 hci_cmd_buffer[pos++] = longword; 265 hci_cmd_buffer[pos++] = longword >> 8; 266 hci_cmd_buffer[pos++] = longword >> 16; 267 if (*format == '4'){ 268 hci_cmd_buffer[pos++] = longword >> 24; 269 } 270 break; 271 case 'B': // bt-addr 272 ptr = va_arg(argptr, uint8_t *); 273 hci_cmd_buffer[pos++] = ptr[5]; 274 hci_cmd_buffer[pos++] = ptr[4]; 275 hci_cmd_buffer[pos++] = ptr[3]; 276 hci_cmd_buffer[pos++] = ptr[2]; 277 hci_cmd_buffer[pos++] = ptr[1]; 278 hci_cmd_buffer[pos++] = ptr[0]; 279 break; 280 case 'P': // c string passed as pascal string with leading 1-byte len 281 ptr = va_arg(argptr, uint8_t *); 282 memcpy(&hci_cmd_buffer[pos], ptr, 16); 283 pos += 16; 284 break; 285 default: 286 break; 287 } 288 format++; 289 }; 290 va_end(argptr); 291 hci_cmd_buffer[2] = pos - 3; 292 // send packet 293 hci_stack.num_cmd_packets--; 294 return hci_stack.hci_transport->send_cmd_packet(hci_cmd_buffer, pos); 295 }