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 "debug.h" 47 #include "hci.h" 48 #include "hci_transport.h" 49 #include "hci_dump.h" 50 51 // #define USE_HCI_READER_THREAD 52 53 typedef enum { 54 H4_W4_PACKET_TYPE, 55 H4_W4_EVENT_HEADER, 56 H4_W4_ACL_HEADER, 57 H4_W4_PAYLOAD, 58 H4_W4_PICKUP 59 } H4_STATE; 60 61 typedef struct hci_transport_h4 { 62 hci_transport_t transport; 63 data_source_t *ds; 64 int uart_fd; // different from ds->fd for HCI reader thread 65 66 #ifdef USE_HCI_READER_THREAD 67 // synchronization facilities for dedicated reader thread 68 int pipe_fds[2]; 69 pthread_mutex_t mutex; 70 pthread_cond_t cond; 71 #endif 72 } hci_transport_h4_t; 73 74 // single instance 75 static hci_transport_h4_t * hci_transport_h4 = NULL; 76 77 static int h4_process(struct data_source *ds); 78 static void *h4_reader(void *context); 79 static int h4_reader_process(struct data_source *ds); 80 static void dummy_handler(uint8_t packet_type, uint8_t *packet, uint16_t size); 81 static hci_uart_config_t *hci_uart_config; 82 83 static void (*packet_handler)(uint8_t packet_type, uint8_t *packet, uint16_t size) = dummy_handler; 84 85 // packet reader state machine 86 static H4_STATE h4_state; 87 static int bytes_to_read; 88 static int read_pos; 89 // static uint8_t hci_event_buffer[255+2]; // maximal payload + 2 bytes header 90 static uint8_t hci_packet[1+HCI_ACL_3DH5_SIZE]; // bigger than largest packet 91 92 93 // prototypes 94 static int h4_open(void *transport_config){ 95 hci_uart_config = (hci_uart_config_t*) transport_config; 96 struct termios toptions; 97 int flags = O_RDWR | O_NOCTTY; 98 #ifndef USE_HCI_READER_THREAD 99 flags |= O_NONBLOCK; 100 #endif 101 int fd = open(hci_uart_config->device_name, flags); 102 if (fd == -1) { 103 perror("init_serialport: Unable to open port "); 104 perror(hci_uart_config->device_name); 105 return -1; 106 } 107 108 if (tcgetattr(fd, &toptions) < 0) { 109 perror("init_serialport: Couldn't get term attributes"); 110 return -1; 111 } 112 speed_t brate = hci_uart_config->baudrate; // let you override switch below if needed 113 switch(hci_uart_config->baudrate) { 114 case 57600: brate=B57600; break; 115 case 115200: brate=B115200; break; 116 #ifdef B230400 117 case 230400: brate=B230400; break; 118 #endif 119 #ifdef B460800 120 case 460800: brate=B460800; break; 121 #endif 122 #ifdef B921600 123 case 921600: brate=B921600; break; 124 #endif 125 } 126 cfsetispeed(&toptions, brate); 127 cfsetospeed(&toptions, brate); 128 129 // 8N1 130 toptions.c_cflag &= ~PARENB; 131 toptions.c_cflag &= ~CSTOPB; 132 toptions.c_cflag &= ~CSIZE; 133 toptions.c_cflag |= CS8; 134 135 if (hci_uart_config->flowcontrol) { 136 // with flow control 137 toptions.c_cflag |= CRTSCTS; 138 } else { 139 // no flow control 140 toptions.c_cflag &= ~CRTSCTS; 141 } 142 143 toptions.c_cflag |= CREAD | CLOCAL; // turn on READ & ignore ctrl lines 144 toptions.c_iflag &= ~(IXON | IXOFF | IXANY); // turn off s/w flow ctrl 145 146 toptions.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); // make raw 147 toptions.c_oflag &= ~OPOST; // make raw 148 149 // see: http://unixwiz.net/techtips/termios-vmin-vtime.html 150 toptions.c_cc[VMIN] = 1; 151 toptions.c_cc[VTIME] = 0; 152 153 if( tcsetattr(fd, TCSANOW, &toptions) < 0) { 154 perror("init_serialport: Couldn't set term attributes"); 155 return -1; 156 } 157 158 // set up data_source 159 hci_transport_h4->ds = malloc(sizeof(data_source_t)); 160 if (!hci_transport_h4->ds) return -1; 161 hci_transport_h4->uart_fd = fd; 162 163 #ifdef USE_HCI_READER_THREAD 164 // init synchronization tools 165 pthread_mutex_init(&hci_transport_h4->mutex, NULL); 166 pthread_cond_init(&hci_transport_h4->cond, NULL); 167 168 // create pipe 169 pipe(hci_transport_h4->pipe_fds); 170 171 // create reader thread 172 pthread_t hci_reader_thread; 173 pthread_create(&hci_reader_thread, NULL, &h4_reader, NULL); 174 175 hci_transport_h4->ds->fd = hci_transport_h4->pipe_fds[0]; 176 hci_transport_h4->ds->process = h4_reader_process; 177 #else 178 hci_transport_h4->ds->fd = fd; 179 hci_transport_h4->ds->process = h4_process; 180 #endif 181 run_loop_add_data_source(hci_transport_h4->ds); 182 183 // init state machine 184 bytes_to_read = 1; 185 h4_state = H4_W4_PACKET_TYPE; 186 read_pos = 0; 187 188 return 0; 189 } 190 191 static int h4_close(){ 192 // first remove run loop handler 193 run_loop_remove_data_source(hci_transport_h4->ds); 194 195 // close device 196 close(hci_transport_h4->ds->fd); 197 198 // free struct 199 free(hci_transport_h4->ds); 200 hci_transport_h4->ds = NULL; 201 return 0; 202 } 203 204 static int h4_send_packet(uint8_t packet_type, uint8_t * packet, int size){ 205 if (hci_transport_h4->ds == NULL) return -1; 206 if (hci_transport_h4->uart_fd == 0) return -1; 207 hci_dump_packet( (uint8_t) packet_type, 0, packet, size); 208 char *data = (char*) packet; 209 int bytes_written = write(hci_transport_h4->uart_fd, &packet_type, 1); 210 while (bytes_written < 1) { 211 usleep(5000); 212 bytes_written = write(hci_transport_h4->uart_fd, &packet_type, 1); 213 }; 214 while (size > 0) { 215 int bytes_written = write(hci_transport_h4->uart_fd, data, size); 216 if (bytes_written < 0) { 217 usleep(5000); 218 continue; 219 } 220 data += bytes_written; 221 size -= bytes_written; 222 } 223 return 0; 224 } 225 226 static void h4_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){ 227 packet_handler = handler; 228 } 229 230 static void h4_deliver_packet(){ 231 if (read_pos < 3) return; // sanity check 232 hci_dump_packet( hci_packet[0], 1, &hci_packet[1], read_pos-1); 233 packet_handler(hci_packet[0], &hci_packet[1], read_pos-1); 234 235 h4_state = H4_W4_PACKET_TYPE; 236 read_pos = 0; 237 bytes_to_read = 1; 238 } 239 240 static void h4_statemachine(){ 241 switch (h4_state) { 242 243 case H4_W4_PACKET_TYPE: 244 if (hci_packet[0] == HCI_EVENT_PACKET){ 245 bytes_to_read = HCI_EVENT_PKT_HDR; 246 h4_state = H4_W4_EVENT_HEADER; 247 } else if (hci_packet[0] == HCI_ACL_DATA_PACKET){ 248 bytes_to_read = HCI_ACL_DATA_PKT_HDR; 249 h4_state = H4_W4_ACL_HEADER; 250 } else { 251 log_err("h4_process: invalid packet type 0x%02x\n", hci_packet[0]); 252 read_pos = 0; 253 bytes_to_read = 1; 254 } 255 break; 256 257 case H4_W4_EVENT_HEADER: 258 bytes_to_read = hci_packet[2]; 259 h4_state = H4_W4_PAYLOAD; 260 break; 261 262 case H4_W4_ACL_HEADER: 263 bytes_to_read = READ_BT_16( hci_packet, 3); 264 h4_state = H4_W4_PAYLOAD; 265 break; 266 267 case H4_W4_PAYLOAD: 268 #ifdef USE_HCI_READER_THREAD 269 h4_state = H4_W4_PICKUP; 270 #else 271 h4_deliver_packet(); 272 #endif 273 break; 274 } 275 } 276 277 static int h4_process(struct data_source *ds) { 278 if (hci_transport_h4->uart_fd == 0) return -1; 279 280 int read_now = bytes_to_read; 281 // if (read_now > 100) { 282 // read_now = 100; 283 // } 284 285 // read up to bytes_to_read data in 286 ssize_t bytes_read = read(hci_transport_h4->uart_fd, &hci_packet[read_pos], read_now); 287 // printf("h4_process: bytes read %u\n", bytes_read); 288 if (bytes_read < 0) { 289 return bytes_read; 290 } 291 292 // hexdump(&hci_packet[read_pos], bytes_read); 293 294 bytes_to_read -= bytes_read; 295 read_pos += bytes_read; 296 if (bytes_to_read > 0) { 297 return 0; 298 } 299 300 h4_statemachine(); 301 return 0; 302 } 303 304 #ifdef USE_HCI_READER_THREAD 305 static int h4_reader_process(struct data_source *ds) { 306 // get token 307 char token; 308 int tokens_read = read(hci_transport_h4->pipe_fds[0], &token, 1); 309 if (tokens_read < 1) { 310 return 0; 311 } 312 313 // hci_reader received complete packet, just pick it up 314 h4_deliver_packet(); 315 316 // un-block reader 317 pthread_mutex_lock(&hci_transport_h4->mutex); 318 pthread_cond_signal(&hci_transport_h4->cond); 319 pthread_mutex_unlock(&hci_transport_h4->mutex); 320 return 0; 321 } 322 323 static void *h4_reader(void *context){ 324 while(1){ 325 // read up to bytes_to_read data in 326 int bytes_read = read(hci_transport_h4->uart_fd, &hci_packet[read_pos], bytes_to_read); 327 // error 328 if (bytes_read < 0) { 329 h4_state = H4_W4_PACKET_TYPE; 330 read_pos = 0; 331 bytes_to_read = 1; 332 continue; 333 } 334 335 bytes_to_read -= bytes_read; 336 read_pos += bytes_read; 337 338 if (bytes_to_read > 0) continue; 339 340 h4_statemachine(); 341 342 if (h4_state != H4_W4_PICKUP) continue; 343 344 // notify main thread 345 char data = 'h'; 346 write(hci_transport_h4->pipe_fds[1], &data, 1); 347 348 // wait for response 349 pthread_mutex_lock(&hci_transport_h4->mutex); 350 pthread_cond_wait(&hci_transport_h4->cond,&hci_transport_h4->mutex); 351 pthread_mutex_unlock(&hci_transport_h4->mutex); 352 } 353 } 354 #endif 355 356 static const char * h4_get_transport_name(){ 357 return "H4"; 358 } 359 360 static void dummy_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 361 } 362 363 // get h4 singleton 364 hci_transport_t * hci_transport_h4_instance() { 365 if (hci_transport_h4 == NULL) { 366 hci_transport_h4 = malloc( sizeof(hci_transport_h4_t)); 367 hci_transport_h4->ds = NULL; 368 hci_transport_h4->transport.open = h4_open; 369 hci_transport_h4->transport.close = h4_close; 370 hci_transport_h4->transport.send_packet = h4_send_packet; 371 hci_transport_h4->transport.register_packet_handler = h4_register_packet_handler; 372 hci_transport_h4->transport.get_transport_name = h4_get_transport_name; 373 } 374 return (hci_transport_t *) hci_transport_h4; 375 } 376