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, int ready); 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(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 close(hci_transport_h4->ds->fd); 125 free(hci_transport_h4->ds); 126 hci_transport_h4->ds = NULL; 127 return 0; 128 } 129 130 static int h4_send_cmd_packet(uint8_t *packet, int size){ 131 if (hci_transport_h4->ds == NULL) return -1; 132 if (hci_transport_h4->ds->fd == 0) return -1; 133 char *data = (char*) packet; 134 char packet_type = HCI_COMMAND_DATA_PACKET; 135 136 hci_dump_packet( (uint8_t) packet_type, 0, packet, size); 137 138 write(hci_transport_h4->ds->fd, &packet_type, 1); 139 while (size > 0) { 140 int bytes_written = write(hci_transport_h4->ds->fd, data, size); 141 if (bytes_written < 0) { 142 return bytes_written; 143 } 144 data += bytes_written; 145 size -= bytes_written; 146 } 147 return 0; 148 } 149 150 static int h4_send_acl_packet(uint8_t *packet, int size){ 151 if (hci_transport_h4->ds->fd == 0) return -1; 152 153 char *data = (char*) packet; 154 char packet_type = HCI_ACL_DATA_PACKET; 155 156 hci_dump_packet( (uint8_t) packet_type, 0, packet, size); 157 158 write(hci_transport_h4->ds->fd, &packet_type, 1); 159 while (size > 0) { 160 int bytes_written = write(hci_transport_h4->ds->fd, data, size); 161 if (bytes_written < 0) { 162 return bytes_written; 163 } 164 data += bytes_written; 165 size -= bytes_written; 166 } 167 return 0; 168 } 169 170 static void h4_register_event_packet_handler(void (*handler)(uint8_t *packet, int size)){ 171 event_packet_handler = handler; 172 } 173 174 static void h4_register_acl_packet_handler (void (*handler)(uint8_t *packet, int size)){ 175 acl_packet_handler = handler; 176 } 177 178 static int h4_process(struct data_source *ds, int ready) { 179 if (hci_transport_h4->ds->fd == 0) return -1; 180 181 // read up to bytes_to_read data in 182 int bytes_read = read(hci_transport_h4->ds->fd, &hci_packet[read_pos], bytes_to_read); 183 if (bytes_read < 0) { 184 return bytes_read; 185 } 186 // printf("Bytes read: %u\n", bytes_read); 187 bytes_to_read -= bytes_read; 188 read_pos += bytes_read; 189 if (bytes_to_read > 0) { 190 return 0; 191 } 192 193 // act 194 switch (h4_state) { 195 case H4_W4_PACKET_TYPE: 196 if (hci_packet[0] == HCI_EVENT_PACKET){ 197 read_pos = 0; 198 bytes_to_read = HCI_EVENT_PKT_HDR; 199 h4_state = H4_W4_EVENT_HEADER; 200 } else if (hci_packet[0] == HCI_ACL_DATA_PACKET){ 201 read_pos = 0; 202 bytes_to_read = HCI_ACL_DATA_PKT_HDR; 203 h4_state = H4_W4_ACL_HEADER; 204 } else { 205 } 206 break; 207 case H4_W4_EVENT_HEADER: 208 bytes_to_read = hci_packet[1]; 209 h4_state = H4_W4_EVENT_PAYLOAD; 210 break; 211 case H4_W4_EVENT_PAYLOAD: 212 hci_dump_packet( HCI_EVENT_PACKET, 1, hci_packet, read_pos); 213 event_packet_handler(hci_packet, read_pos); 214 h4_state = H4_W4_PACKET_TYPE; 215 read_pos = 0; 216 bytes_to_read = 1; 217 break; 218 case H4_W4_ACL_HEADER: 219 bytes_to_read = READ_BT_16( hci_packet, 2); 220 h4_state = H4_W4_ACL_PAYLOAD; 221 break; 222 case H4_W4_ACL_PAYLOAD: 223 hci_dump_packet( HCI_ACL_DATA_PACKET, 1, hci_packet, read_pos); 224 225 acl_packet_handler(hci_packet, read_pos); 226 h4_state = H4_W4_PACKET_TYPE; 227 read_pos = 0; 228 bytes_to_read = 1; 229 break; 230 } 231 return 0; 232 } 233 234 static const char * h4_get_transport_name(){ 235 return "H4"; 236 } 237 238 static void dummy_handler(uint8_t *packet, int size){ 239 } 240 241 // get h4 singleton 242 hci_transport_t * hci_transport_h4_instance() { 243 if (hci_transport_h4 == NULL) { 244 hci_transport_h4 = malloc( sizeof(hci_transport_h4_t)); 245 hci_transport_h4->ds = NULL; 246 hci_transport_h4->transport.open = h4_open; 247 hci_transport_h4->transport.close = h4_close; 248 hci_transport_h4->transport.send_cmd_packet = h4_send_cmd_packet; 249 hci_transport_h4->transport.send_acl_packet = h4_send_acl_packet; 250 hci_transport_h4->transport.register_event_packet_handler = h4_register_event_packet_handler; 251 hci_transport_h4->transport.register_acl_packet_handler = h4_register_acl_packet_handler; 252 hci_transport_h4->transport.get_transport_name = h4_get_transport_name; 253 } 254 return hci_transport_h4; 255 } 256