1 /* 2 * Copyright (C) 2009 by Matthias Ringwald 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY MATTHIAS RINGWALD AND CONTRIBUTORS 18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 20 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 21 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 23 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 24 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 25 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 27 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 */ 31 32 /* 33 * hci_h4_transport.c 34 * 35 * HCI Transport API implementation for basic H4 protocol 36 * 37 * Created by Matthias Ringwald on 4/29/09. 38 */ 39 #include <termios.h> /* POSIX terminal control definitions */ 40 #include <fcntl.h> /* File control definitions */ 41 #include <unistd.h> /* UNIX standard function definitions */ 42 #include <stdio.h> 43 #include <string.h> 44 #include <pthread.h> 45 46 #include "hci.h" 47 #include "hci_transport.h" 48 #include "hci_dump.h" 49 50 // #define USE_HCI_READER_THREAD 51 52 typedef enum { 53 H4_W4_PACKET_TYPE, 54 H4_W4_EVENT_HEADER, 55 H4_W4_ACL_HEADER, 56 H4_W4_PAYLOAD, 57 H4_W4_PICKUP 58 } H4_STATE; 59 60 typedef struct hci_transport_h4 { 61 hci_transport_t transport; 62 data_source_t *ds; 63 int uart_fd; // different from ds->fd for HCI reader thread 64 65 #ifdef USE_HCI_READER_THREAD 66 // synchronization facilities for dedicated reader thread 67 int pipe_fds[2]; 68 pthread_mutex_t mutex; 69 pthread_cond_t cond; 70 #endif 71 } hci_transport_h4_t; 72 73 // single instance 74 static hci_transport_h4_t * hci_transport_h4 = NULL; 75 76 static int h4_process(struct data_source *ds); 77 static void *h4_reader(void *context); 78 static int h4_reader_process(struct data_source *ds); 79 static void dummy_handler(uint8_t packet_type, uint8_t *packet, uint16_t size); 80 static hci_uart_config_t *hci_uart_config; 81 82 static void (*packet_handler)(uint8_t packet_type, uint8_t *packet, uint16_t size) = dummy_handler; 83 84 // packet reader state machine 85 static H4_STATE h4_state; 86 static int bytes_to_read; 87 static int read_pos; 88 // static uint8_t hci_event_buffer[255+2]; // maximal payload + 2 bytes header 89 static uint8_t hci_packet[1+HCI_ACL_3DH5_SIZE]; // bigger than largest packet 90 91 92 // prototypes 93 static int h4_open(void *transport_config){ 94 hci_uart_config = (hci_uart_config_t*) transport_config; 95 struct termios toptions; 96 int flags = O_RDWR | O_NOCTTY; 97 #ifndef USE_HCI_READER_THREAD 98 flags |= O_NONBLOCK; 99 #endif 100 int fd = open(hci_uart_config->device_name, flags); 101 if (fd == -1) { 102 perror("init_serialport: Unable to open port "); 103 perror(hci_uart_config->device_name); 104 return -1; 105 } 106 107 if (tcgetattr(fd, &toptions) < 0) { 108 perror("init_serialport: Couldn't get term attributes"); 109 return -1; 110 } 111 speed_t brate = hci_uart_config->baudrate; // let you override switch below if needed 112 switch(hci_uart_config->baudrate) { 113 case 57600: brate=B57600; break; 114 case 115200: brate=B115200; break; 115 #ifdef B230400 116 case 230400: brate=B230400; break; 117 #endif 118 #ifdef B460800 119 case 460800: brate=B460800; break; 120 #endif 121 #ifdef B921600 122 case 921600: brate=B921600; break; 123 #endif 124 } 125 cfsetispeed(&toptions, brate); 126 cfsetospeed(&toptions, brate); 127 128 // 8N1 129 toptions.c_cflag &= ~PARENB; 130 toptions.c_cflag &= ~CSTOPB; 131 toptions.c_cflag &= ~CSIZE; 132 toptions.c_cflag |= CS8; 133 134 if (hci_uart_config->flowcontrol) { 135 // with flow control 136 toptions.c_cflag |= CRTSCTS; 137 } else { 138 // no flow control 139 toptions.c_cflag &= ~CRTSCTS; 140 } 141 142 toptions.c_cflag |= CREAD | CLOCAL; // turn on READ & ignore ctrl lines 143 toptions.c_iflag &= ~(IXON | IXOFF | IXANY); // turn off s/w flow ctrl 144 145 toptions.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); // make raw 146 toptions.c_oflag &= ~OPOST; // make raw 147 148 // see: http://unixwiz.net/techtips/termios-vmin-vtime.html 149 toptions.c_cc[VMIN] = 1; 150 toptions.c_cc[VTIME] = 0; 151 152 if( tcsetattr(fd, TCSANOW, &toptions) < 0) { 153 perror("init_serialport: Couldn't set term attributes"); 154 return -1; 155 } 156 157 // set up data_source 158 hci_transport_h4->ds = malloc(sizeof(data_source_t)); 159 if (!hci_transport_h4->ds) return -1; 160 hci_transport_h4->uart_fd = fd; 161 162 #ifdef USE_HCI_READER_THREAD 163 // init synchronization tools 164 pthread_mutex_init(&hci_transport_h4->mutex, NULL); 165 pthread_cond_init(&hci_transport_h4->cond, NULL); 166 167 // create pipe 168 pipe(hci_transport_h4->pipe_fds); 169 170 // create reader thread 171 pthread_t hci_reader_thread; 172 pthread_create(&hci_reader_thread, NULL, &h4_reader, NULL); 173 174 hci_transport_h4->ds->fd = hci_transport_h4->pipe_fds[0]; 175 hci_transport_h4->ds->process = h4_reader_process; 176 #else 177 hci_transport_h4->ds->fd = fd; 178 hci_transport_h4->ds->process = h4_process; 179 #endif 180 run_loop_add_data_source(hci_transport_h4->ds); 181 182 // init state machine 183 bytes_to_read = 1; 184 h4_state = H4_W4_PACKET_TYPE; 185 read_pos = 0; 186 187 return 0; 188 } 189 190 static int h4_close(){ 191 // first remove run loop handler 192 run_loop_remove_data_source(hci_transport_h4->ds); 193 194 // close device 195 close(hci_transport_h4->ds->fd); 196 free(hci_transport_h4->ds); 197 198 // free struct 199 hci_transport_h4->ds = NULL; 200 return 0; 201 } 202 203 static int h4_send_packet(uint8_t packet_type, uint8_t * packet, int size){ 204 if (hci_transport_h4->ds == NULL) return -1; 205 if (hci_transport_h4->uart_fd == 0) return -1; 206 hci_dump_packet( (uint8_t) packet_type, 0, packet, size); 207 write(hci_transport_h4->uart_fd, &packet_type, 1); 208 char *data = (char*) packet; 209 while (size > 0) { 210 int bytes_written = write(hci_transport_h4->uart_fd, data, size); 211 if (bytes_written < 0) { 212 usleep(5000); 213 continue; 214 } 215 data += bytes_written; 216 size -= bytes_written; 217 } 218 return 0; 219 } 220 221 static void h4_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){ 222 packet_handler = handler; 223 } 224 225 static void h4_deliver_packet(){ 226 if (read_pos < 3) return; // sanity check 227 hci_dump_packet( hci_packet[0], 1, &hci_packet[1], read_pos-1); 228 packet_handler(hci_packet[0], &hci_packet[1], read_pos-1); 229 230 h4_state = H4_W4_PACKET_TYPE; 231 read_pos = 0; 232 bytes_to_read = 1; 233 } 234 235 static void h4_statemachine(){ 236 switch (h4_state) { 237 238 case H4_W4_PACKET_TYPE: 239 if (hci_packet[0] == HCI_EVENT_PACKET){ 240 bytes_to_read = HCI_EVENT_PKT_HDR; 241 h4_state = H4_W4_EVENT_HEADER; 242 } else if (hci_packet[0] == HCI_ACL_DATA_PACKET){ 243 bytes_to_read = HCI_ACL_DATA_PKT_HDR; 244 h4_state = H4_W4_ACL_HEADER; 245 } else { 246 fprintf(stderr, "h4_process: invalid packet type 0x%02x\n", hci_packet[0]); 247 read_pos = 0; 248 bytes_to_read = 1; 249 } 250 break; 251 252 case H4_W4_EVENT_HEADER: 253 bytes_to_read = hci_packet[2]; 254 h4_state = H4_W4_PAYLOAD; 255 break; 256 257 case H4_W4_ACL_HEADER: 258 bytes_to_read = READ_BT_16( hci_packet, 3); 259 h4_state = H4_W4_PAYLOAD; 260 break; 261 262 case H4_W4_PAYLOAD: 263 #ifdef USE_HCI_READER_THREAD 264 h4_state = H4_W4_PICKUP; 265 #else 266 h4_deliver_packet(); 267 #endif 268 break; 269 } 270 } 271 272 static int h4_process(struct data_source *ds) { 273 if (hci_transport_h4->uart_fd == 0) return -1; 274 275 // read up to bytes_to_read data in 276 int bytes_read = read(hci_transport_h4->uart_fd, &hci_packet[read_pos], bytes_to_read); 277 if (bytes_read < 0) { 278 return bytes_read; 279 } 280 bytes_to_read -= bytes_read; 281 read_pos += bytes_read; 282 if (bytes_to_read > 0) { 283 return 0; 284 } 285 286 h4_statemachine(); 287 return 0; 288 } 289 290 static int h4_reader_process(struct data_source *ds) { 291 // get token 292 char token; 293 read(hci_transport_h4->pipe_fds[0], &token, 1); 294 295 // hci_reader received complete packet, just pick it up 296 h4_deliver_packet(); 297 298 // un-block reader 299 pthread_mutex_lock(&hci_transport_h4->mutex); 300 pthread_cond_signal(&hci_transport_h4->cond); 301 pthread_mutex_unlock(&hci_transport_h4->mutex); 302 return 0; 303 } 304 305 #ifdef USE_HCI_READER_THREAD 306 static void *h4_reader(void *context){ 307 while(1){ 308 // read up to bytes_to_read data in 309 int bytes_read = read(hci_transport_h4->uart_fd, &hci_packet[read_pos], bytes_to_read); 310 // error 311 if (bytes_read < 0) { 312 h4_state = H4_W4_PACKET_TYPE; 313 read_pos = 0; 314 bytes_to_read = 1; 315 continue; 316 } 317 318 bytes_to_read -= bytes_read; 319 read_pos += bytes_read; 320 321 if (bytes_to_read > 0) continue; 322 323 h4_statemachine(); 324 325 if (h4_state != H4_W4_PICKUP) continue; 326 327 // notify main thread 328 char data = 'h'; 329 write(hci_transport_h4->pipe_fds[1], &data, 1); 330 331 // wait for response 332 pthread_mutex_lock(&hci_transport_h4->mutex); 333 pthread_cond_wait(&hci_transport_h4->cond,&hci_transport_h4->mutex); 334 pthread_mutex_unlock(&hci_transport_h4->mutex); 335 } 336 } 337 #endif 338 339 static const char * h4_get_transport_name(){ 340 return "H4"; 341 } 342 343 static void dummy_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 344 } 345 346 // get h4 singleton 347 hci_transport_t * hci_transport_h4_instance() { 348 if (hci_transport_h4 == NULL) { 349 hci_transport_h4 = malloc( sizeof(hci_transport_h4_t)); 350 hci_transport_h4->ds = NULL; 351 hci_transport_h4->transport.open = h4_open; 352 hci_transport_h4->transport.close = h4_close; 353 hci_transport_h4->transport.send_packet = h4_send_packet; 354 hci_transport_h4->transport.register_packet_handler = h4_register_packet_handler; 355 hci_transport_h4->transport.get_transport_name = h4_get_transport_name; 356 } 357 return (hci_transport_t *) hci_transport_h4; 358 } 359