1 /* 2 * hci_h4_transport.c 3 * 4 * HCI Transport API implementation for basic H4 protocol 5 * 6 * Created by Matthias Ringwald on 4/29/09. 7 */ 8 #include <termios.h> /* POSIX terminal control definitions */ 9 #include <fcntl.h> /* File control definitions */ 10 #include <unistd.h> /* UNIX standard function definitions */ 11 #include <stdio.h> 12 13 #include "hci.h" 14 #include "hci_transport_h4.h" 15 #include "hci_dump.h" 16 17 typedef enum { 18 H4_W4_PACKET_TYPE, 19 H4_W4_EVENT_HEADER, 20 H4_W4_EVENT_PAYLOAD, 21 H4_W4_ACL_HEADER, 22 H4_W4_ACL_PAYLOAD 23 } H4_STATE; 24 25 typedef struct hci_transport_h4 { 26 hci_transport_t transport; 27 data_source_t *ds; 28 } hci_transport_h4_t; 29 30 // single instance 31 static hci_transport_h4_t * hci_transport_h4 = NULL; 32 33 static int h4_process(struct data_source *ds); 34 static void dummy_handler(uint8_t *packet, int size); 35 static hci_uart_config_t *hci_uart_config; 36 37 static void (*event_packet_handler)(uint8_t *packet, int size) = dummy_handler; 38 static void (*acl_packet_handler) (uint8_t *packet, int size) = dummy_handler; 39 40 // packet reader state machine 41 static H4_STATE h4_state; 42 static int bytes_to_read; 43 static int read_pos; 44 // static uint8_t hci_event_buffer[255+2]; // maximal payload + 2 bytes header 45 static uint8_t hci_packet[400]; // bigger than largest packet 46 47 // prototypes 48 static int h4_open(void *transport_config){ 49 hci_uart_config = (hci_uart_config_t*) transport_config; 50 struct termios toptions; 51 int fd = open(hci_uart_config->device_name, O_RDWR | O_NOCTTY | O_NDELAY); 52 if (fd == -1) { 53 perror("init_serialport: Unable to open port "); 54 perror(hci_uart_config->device_name); 55 return -1; 56 } 57 58 if (tcgetattr(fd, &toptions) < 0) { 59 perror("init_serialport: Couldn't get term attributes"); 60 return -1; 61 } 62 speed_t brate = hci_uart_config->baudrate; // let you override switch below if needed 63 switch(hci_uart_config->baudrate) { 64 case 57600: brate=B57600; break; 65 case 115200: brate=B115200; break; 66 #ifdef B230400 67 case 230400: brate=B230400; break; 68 #endif 69 #ifdef B460800 70 case 460800: brate=B460800; break; 71 #endif 72 #ifdef B921600 73 case 921600: brate=B921600; break; 74 #endif 75 } 76 cfsetispeed(&toptions, brate); 77 cfsetospeed(&toptions, brate); 78 79 // 8N1 80 toptions.c_cflag &= ~PARENB; 81 toptions.c_cflag &= ~CSTOPB; 82 toptions.c_cflag &= ~CSIZE; 83 toptions.c_cflag |= CS8; 84 85 if (hci_uart_config->flowcontrol) { 86 // with flow control 87 toptions.c_cflag |= CRTSCTS; 88 } else { 89 // no flow control 90 toptions.c_cflag &= ~CRTSCTS; 91 } 92 93 toptions.c_cflag |= CREAD | CLOCAL; // turn on READ & ignore ctrl lines 94 toptions.c_iflag &= ~(IXON | IXOFF | IXANY); // turn off s/w flow ctrl 95 96 toptions.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); // make raw 97 toptions.c_oflag &= ~OPOST; // make raw 98 99 // see: http://unixwiz.net/techtips/termios-vmin-vtime.html 100 toptions.c_cc[VMIN] = 1; 101 toptions.c_cc[VTIME] = 0; 102 103 if( tcsetattr(fd, TCSANOW, &toptions) < 0) { 104 perror("init_serialport: Couldn't set term attributes"); 105 return -1; 106 } 107 108 // set up data_source 109 hci_transport_h4->ds = malloc(sizeof(data_source_t)); 110 if (!hci_transport_h4) return -1; 111 hci_transport_h4->ds->fd = fd; 112 hci_transport_h4->ds->process = h4_process; 113 run_loop_add_data_source(hci_transport_h4->ds); 114 115 // init state machine 116 bytes_to_read = 1; 117 h4_state = H4_W4_PACKET_TYPE; 118 read_pos = 0; 119 120 return 0; 121 } 122 123 static int h4_close(){ 124 // first remove run loop handler 125 run_loop_remove_data_source(hci_transport_h4->ds); 126 127 // close device 128 close(hci_transport_h4->ds->fd); 129 free(hci_transport_h4->ds); 130 131 // free struct 132 hci_transport_h4->ds = NULL; 133 return 0; 134 } 135 136 static int h4_send_cmd_packet(uint8_t *packet, int size){ 137 if (hci_transport_h4->ds == NULL) return -1; 138 if (hci_transport_h4->ds->fd == 0) return -1; 139 char *data = (char*) packet; 140 char packet_type = HCI_COMMAND_DATA_PACKET; 141 142 hci_dump_packet( (uint8_t) packet_type, 0, packet, size); 143 144 write(hci_transport_h4->ds->fd, &packet_type, 1); 145 while (size > 0) { 146 int bytes_written = write(hci_transport_h4->ds->fd, data, size); 147 if (bytes_written < 0) { 148 return bytes_written; 149 } 150 data += bytes_written; 151 size -= bytes_written; 152 } 153 return 0; 154 } 155 156 static int h4_send_acl_packet(uint8_t *packet, int size){ 157 if (hci_transport_h4->ds->fd == 0) return -1; 158 159 char *data = (char*) packet; 160 char packet_type = HCI_ACL_DATA_PACKET; 161 162 hci_dump_packet( (uint8_t) packet_type, 0, packet, size); 163 164 write(hci_transport_h4->ds->fd, &packet_type, 1); 165 while (size > 0) { 166 int bytes_written = write(hci_transport_h4->ds->fd, data, size); 167 if (bytes_written < 0) { 168 return bytes_written; 169 } 170 data += bytes_written; 171 size -= bytes_written; 172 } 173 return 0; 174 } 175 176 static void h4_register_event_packet_handler(void (*handler)(uint8_t *packet, int size)){ 177 event_packet_handler = handler; 178 } 179 180 static void h4_register_acl_packet_handler (void (*handler)(uint8_t *packet, int size)){ 181 acl_packet_handler = handler; 182 } 183 184 static int h4_process(struct data_source *ds) { 185 if (hci_transport_h4->ds->fd == 0) return -1; 186 187 // read up to bytes_to_read data in 188 int bytes_read = read(hci_transport_h4->ds->fd, &hci_packet[read_pos], bytes_to_read); 189 if (bytes_read < 0) { 190 return bytes_read; 191 } 192 bytes_to_read -= bytes_read; 193 read_pos += bytes_read; 194 if (bytes_to_read > 0) { 195 return 0; 196 } 197 198 // act 199 switch (h4_state) { 200 case H4_W4_PACKET_TYPE: 201 if (hci_packet[0] == HCI_EVENT_PACKET){ 202 read_pos = 0; 203 bytes_to_read = HCI_EVENT_PKT_HDR; 204 h4_state = H4_W4_EVENT_HEADER; 205 } else if (hci_packet[0] == HCI_ACL_DATA_PACKET){ 206 read_pos = 0; 207 bytes_to_read = HCI_ACL_DATA_PKT_HDR; 208 h4_state = H4_W4_ACL_HEADER; 209 } else { 210 } 211 break; 212 case H4_W4_EVENT_HEADER: 213 bytes_to_read = hci_packet[1]; 214 h4_state = H4_W4_EVENT_PAYLOAD; 215 break; 216 case H4_W4_EVENT_PAYLOAD: 217 hci_dump_packet( HCI_EVENT_PACKET, 1, hci_packet, read_pos); 218 event_packet_handler(hci_packet, read_pos); 219 h4_state = H4_W4_PACKET_TYPE; 220 read_pos = 0; 221 bytes_to_read = 1; 222 break; 223 case H4_W4_ACL_HEADER: 224 bytes_to_read = READ_BT_16( hci_packet, 2); 225 h4_state = H4_W4_ACL_PAYLOAD; 226 break; 227 case H4_W4_ACL_PAYLOAD: 228 hci_dump_packet( HCI_ACL_DATA_PACKET, 1, hci_packet, read_pos); 229 230 acl_packet_handler(hci_packet, read_pos); 231 h4_state = H4_W4_PACKET_TYPE; 232 read_pos = 0; 233 bytes_to_read = 1; 234 break; 235 } 236 return 0; 237 } 238 239 static const char * h4_get_transport_name(){ 240 return "H4"; 241 } 242 243 static void dummy_handler(uint8_t *packet, int size){ 244 } 245 246 // get h4 singleton 247 hci_transport_t * hci_transport_h4_instance() { 248 if (hci_transport_h4 == NULL) { 249 hci_transport_h4 = malloc( sizeof(hci_transport_h4_t)); 250 hci_transport_h4->ds = NULL; 251 hci_transport_h4->transport.open = h4_open; 252 hci_transport_h4->transport.close = h4_close; 253 hci_transport_h4->transport.send_cmd_packet = h4_send_cmd_packet; 254 hci_transport_h4->transport.send_acl_packet = h4_send_acl_packet; 255 hci_transport_h4->transport.register_event_packet_handler = h4_register_event_packet_handler; 256 hci_transport_h4->transport.register_acl_packet_handler = h4_register_acl_packet_handler; 257 hci_transport_h4->transport.get_transport_name = h4_get_transport_name; 258 } 259 return (hci_transport_t *) hci_transport_h4; 260 } 261