1 /*- 2 * Copyright (C) 2008-2009 Semihalf, Michal Hajduk and Bartlomiej Sieka 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 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 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <err.h> 31 #include <errno.h> 32 #include <sysexits.h> 33 #include <fcntl.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <stdarg.h> 38 #include <unistd.h> 39 #include <sys/ioctl.h> 40 41 #include <dev/iicbus/iic.h> 42 43 #define I2C_DEV "/dev/iic0" 44 #define I2C_MODE_NOTSET 0 45 #define I2C_MODE_NONE 1 46 #define I2C_MODE_STOP_START 2 47 #define I2C_MODE_REPEATED_START 3 48 49 struct options { 50 int width; 51 int count; 52 int verbose; 53 int addr_set; 54 int binary; 55 int scan; 56 int skip; 57 int reset; 58 int mode; 59 char dir; 60 uint32_t addr; 61 uint32_t off; 62 }; 63 64 struct skip_range { 65 int start; 66 int end; 67 }; 68 69 __dead2 static void 70 usage(void) 71 { 72 73 fprintf(stderr, "usage: %s -a addr [-f device] [-d [r|w]] [-o offset] " 74 "[-w [0|8|16]] [-c count] [-m [ss|rs|no]] [-b] [-v]\n", 75 getprogname()); 76 fprintf(stderr, " %s -s [-f device] [-n skip_addr] -v\n", 77 getprogname()); 78 fprintf(stderr, " %s -r [-f device] -v\n", getprogname()); 79 exit(EX_USAGE); 80 } 81 82 static struct skip_range 83 skip_get_range(char *skip_addr) 84 { 85 struct skip_range addr_range; 86 char *token; 87 88 addr_range.start = 0; 89 addr_range.end = 0; 90 91 token = strsep(&skip_addr, ".."); 92 if (token) { 93 addr_range.start = strtoul(token, 0, 16); 94 token = strsep(&skip_addr, ".."); 95 if ((token != NULL) && !atoi(token)) { 96 token = strsep(&skip_addr, ".."); 97 if (token) 98 addr_range.end = strtoul(token, 0, 16); 99 } 100 } 101 102 return (addr_range); 103 } 104 105 /* Parse the string to get hex 7 bits addresses */ 106 static int 107 skip_get_tokens(char *skip_addr, int *sk_addr, int max_index) 108 { 109 char *token; 110 int i; 111 112 for (i = 0; i < max_index; i++) { 113 token = strsep(&skip_addr, ":"); 114 if (token == NULL) 115 break; 116 sk_addr[i] = strtoul(token, 0, 16); 117 } 118 return (i); 119 } 120 121 static int 122 scan_bus(struct iiccmd cmd, char *dev, int skip, char *skip_addr) 123 { 124 struct skip_range addr_range = { 0, 0 }; 125 int *tokens, fd, error, i, index, j; 126 int len = 0, do_skip = 0, no_range = 1; 127 128 fd = open(dev, O_RDWR); 129 if (fd == -1) { 130 fprintf(stderr, "Error opening I2C controller (%s) for " 131 "scanning: %s\n", dev, strerror(errno)); 132 return (EX_NOINPUT); 133 } 134 135 if (skip) { 136 len = strlen(skip_addr); 137 if (strstr(skip_addr, "..") != NULL) { 138 addr_range = skip_get_range(skip_addr); 139 no_range = 0; 140 } else { 141 tokens = (int *)malloc((len / 2 + 1) * sizeof(int)); 142 if (tokens == NULL) { 143 fprintf(stderr, "Error allocating tokens " 144 "buffer\n"); 145 error = -1; 146 goto out; 147 } 148 index = skip_get_tokens(skip_addr, tokens, 149 len / 2 + 1); 150 } 151 152 if (!no_range && (addr_range.start > addr_range.end)) { 153 fprintf(stderr, "Skip address out of range\n"); 154 error = -1; 155 goto out; 156 } 157 } 158 159 printf("Scanning I2C devices on %s: ", dev); 160 for (i = 1; i < 127; i++) { 161 162 if (skip && ( addr_range.start < addr_range.end)) { 163 if (i >= addr_range.start && i <= addr_range.end) 164 continue; 165 166 } else if (skip && no_range) 167 for (j = 0; j < index; j++) { 168 if (tokens[j] == i) { 169 do_skip = 1; 170 break; 171 } 172 } 173 174 if (do_skip) { 175 do_skip = 0; 176 continue; 177 } 178 179 cmd.slave = i << 1; 180 cmd.last = 1; 181 cmd.count = 0; 182 error = ioctl(fd, I2CRSTCARD, &cmd); 183 if (error) 184 goto out; 185 186 cmd.slave = i << 1; 187 cmd.last = 1; 188 error = ioctl(fd, I2CSTART, &cmd); 189 if (!error) 190 printf("%x ", i); 191 cmd.slave = i << 1; 192 cmd.last = 1; 193 error = ioctl(fd, I2CSTOP, &cmd); 194 } 195 printf("\n"); 196 197 error = ioctl(fd, I2CRSTCARD, &cmd); 198 out: 199 close(fd); 200 if (skip && no_range) 201 free(tokens); 202 203 if (error) { 204 fprintf(stderr, "Error scanning I2C controller (%s): %s\n", 205 dev, strerror(errno)); 206 return (EX_NOINPUT); 207 } else 208 return (EX_OK); 209 } 210 211 static int 212 reset_bus(struct iiccmd cmd, char *dev) 213 { 214 int fd, error; 215 216 fd = open(dev, O_RDWR); 217 if (fd == -1) { 218 fprintf(stderr, "Error opening I2C controller (%s) for " 219 "resetting: %s\n", dev, strerror(errno)); 220 return (EX_NOINPUT); 221 } 222 223 printf("Resetting I2C controller on %s: ", dev); 224 error = ioctl(fd, I2CRSTCARD, &cmd); 225 close (fd); 226 227 if (error) { 228 printf("error: %s\n", strerror(errno)); 229 return (EX_IOERR); 230 } else { 231 printf("OK\n"); 232 return (EX_OK); 233 } 234 } 235 236 static char * 237 prepare_buf(int size, uint32_t off) 238 { 239 char *buf; 240 241 buf = malloc(size); 242 if (buf == NULL) 243 return (buf); 244 245 if (size == 1) 246 buf[0] = off & 0xff; 247 else if (size == 2) { 248 buf[0] = (off >> 8) & 0xff; 249 buf[1] = off & 0xff; 250 } 251 252 return (buf); 253 } 254 255 static int 256 i2c_write(char *dev, struct options i2c_opt, char *i2c_buf) 257 { 258 struct iiccmd cmd; 259 int ch, i, error, fd, bufsize; 260 char *err_msg, *buf; 261 262 /* 263 * Read data to be written to the chip from stdin 264 */ 265 if (i2c_opt.verbose && !i2c_opt.binary) 266 fprintf(stderr, "Enter %u bytes of data: ", i2c_opt.count); 267 268 for (i = 0; i < i2c_opt.count; i++) { 269 ch = getchar(); 270 if (ch == EOF) { 271 free(i2c_buf); 272 err(1, "not enough data, exiting\n"); 273 } 274 i2c_buf[i] = ch; 275 } 276 277 fd = open(dev, O_RDWR); 278 if (fd == -1) { 279 free(i2c_buf); 280 err(1, "open failed"); 281 } 282 283 cmd.slave = i2c_opt.addr; 284 error = ioctl(fd, I2CSTART, &cmd); 285 if (error == -1) { 286 err_msg = "ioctl: error sending start condition"; 287 goto err1; 288 } 289 290 if (i2c_opt.width) { 291 bufsize = i2c_opt.width / 8; 292 buf = prepare_buf(bufsize, i2c_opt.off); 293 if (buf == NULL) { 294 err_msg = "error: offset malloc"; 295 goto err1; 296 } 297 } else 298 bufsize = 0; 299 300 switch(i2c_opt.mode) { 301 case I2C_MODE_STOP_START: 302 /* 303 * Write offset where the data will go 304 */ 305 if (i2c_opt.width) { 306 cmd.count = bufsize; 307 cmd.buf = buf; 308 error = ioctl(fd, I2CWRITE, &cmd); 309 free(buf); 310 if (error == -1) { 311 err_msg = "ioctl: error when write offset"; 312 goto err1; 313 } 314 } 315 316 error = ioctl(fd, I2CSTOP, &cmd); 317 if (error == -1) { 318 err_msg = "ioctl: error sending stop condition"; 319 goto err2; 320 } 321 cmd.slave = i2c_opt.addr; 322 error = ioctl(fd, I2CSTART, &cmd); 323 if (error == -1) { 324 err_msg = "ioctl: error sending start condition"; 325 goto err1; 326 } 327 328 /* 329 * Write the data 330 */ 331 cmd.count = i2c_opt.count; 332 cmd.buf = i2c_buf; 333 cmd.last = 0; 334 error = ioctl(fd, I2CWRITE, &cmd); 335 if (error == -1) { 336 err_msg = "ioctl: error when write"; 337 goto err1; 338 } 339 break; 340 341 case I2C_MODE_REPEATED_START: 342 /* 343 * Write offset where the data will go 344 */ 345 if (i2c_opt.width) { 346 cmd.count = bufsize; 347 cmd.buf = buf; 348 error = ioctl(fd, I2CWRITE, &cmd); 349 free(buf); 350 if (error == -1) { 351 err_msg = "ioctl: error when write offset"; 352 goto err1; 353 } 354 } 355 356 cmd.slave = i2c_opt.addr; 357 error = ioctl(fd, I2CRPTSTART, &cmd); 358 if (error == -1) { 359 err_msg = "ioctl: error sending repeated start " 360 "condition"; 361 goto err1; 362 } 363 364 /* 365 * Write the data 366 */ 367 cmd.count = i2c_opt.count; 368 cmd.buf = i2c_buf; 369 cmd.last = 0; 370 error = ioctl(fd, I2CWRITE, &cmd); 371 if (error == -1) { 372 err_msg = "ioctl: error when write"; 373 goto err1; 374 } 375 break; 376 377 case I2C_MODE_NONE: /* fall through */ 378 default: 379 buf = realloc(buf, bufsize + i2c_opt.count); 380 if (buf == NULL) { 381 err_msg = "error: data malloc"; 382 goto err1; 383 } 384 385 memcpy(buf + bufsize, i2c_buf, i2c_opt.count); 386 /* 387 * Write offset and data 388 */ 389 cmd.count = bufsize + i2c_opt.count; 390 cmd.buf = buf; 391 cmd.last = 0; 392 error = ioctl(fd, I2CWRITE, &cmd); 393 free(buf); 394 if (error == -1) { 395 err_msg = "ioctl: error when write"; 396 goto err1; 397 } 398 break; 399 } 400 cmd.slave = i2c_opt.addr; 401 error = ioctl(fd, I2CSTOP, &cmd); 402 if (error == -1) { 403 err_msg = "ioctl: error sending stop condition"; 404 goto err2; 405 } 406 407 close(fd); 408 return (0); 409 410 err1: 411 cmd.slave = i2c_opt.addr; 412 error = ioctl(fd, I2CSTOP, &cmd); 413 if (error == -1) 414 fprintf(stderr, "error sending stop condtion\n"); 415 err2: 416 if (err_msg) 417 fprintf(stderr, "%s", err_msg); 418 419 close(fd); 420 return (1); 421 } 422 423 static int 424 i2c_read(char *dev, struct options i2c_opt, char *i2c_buf) 425 { 426 struct iiccmd cmd; 427 int i, fd, error, bufsize; 428 char *err_msg, data = 0, *buf; 429 430 fd = open(dev, O_RDWR); 431 if (fd == -1) 432 err(1, "open failed"); 433 434 bzero(&cmd, sizeof(cmd)); 435 436 if (i2c_opt.width) { 437 cmd.slave = i2c_opt.addr; 438 cmd.count = 1; 439 cmd.last = 0; 440 cmd.buf = &data; 441 error = ioctl(fd, I2CSTART, &cmd); 442 if (error == -1) { 443 err_msg = "ioctl: error sending start condition"; 444 goto err1; 445 } 446 bufsize = i2c_opt.width / 8; 447 buf = prepare_buf(bufsize, i2c_opt.off); 448 if (buf == NULL) { 449 err_msg = "error: offset malloc"; 450 goto err1; 451 } 452 453 cmd.count = bufsize; 454 cmd.buf = buf; 455 cmd.last = 0; 456 error = ioctl(fd, I2CWRITE, &cmd); 457 free(buf); 458 if (error == -1) { 459 err_msg = "ioctl: error when write offset"; 460 goto err1; 461 } 462 463 if (i2c_opt.mode == I2C_MODE_STOP_START) { 464 cmd.slave = i2c_opt.addr; 465 error = ioctl(fd, I2CSTOP, &cmd); 466 if (error == -1) { 467 err_msg = "error sending stop condtion\n"; 468 goto err2; 469 } 470 } 471 } 472 cmd.slave = i2c_opt.addr; 473 cmd.count = 1; 474 cmd.last = 0; 475 cmd.buf = &data; 476 if (i2c_opt.mode == I2C_MODE_STOP_START) { 477 error = ioctl(fd, I2CSTART, &cmd); 478 if (error == -1) { 479 err_msg = "ioctl: error sending start condition"; 480 goto err1; 481 } 482 } else if (i2c_opt.mode == I2C_MODE_REPEATED_START) { 483 error = ioctl(fd, I2CRPTSTART, &cmd); 484 if (error == -1) { 485 err_msg = "ioctl: error sending repeated start " 486 "condition"; 487 goto err1; 488 } 489 } 490 error = ioctl(fd, I2CSTOP, &cmd); 491 if (error == -1) { 492 err_msg = "error sending stop condtion\n"; 493 goto err2; 494 } 495 496 for (i = 0; i < i2c_opt.count; i++) { 497 error = read(fd, &i2c_buf[i], 1); 498 if (error == -1) { 499 err_msg = "ioctl: error while reading"; 500 goto err1; 501 } 502 } 503 504 close(fd); 505 return (0); 506 507 err1: 508 cmd.slave = i2c_opt.addr; 509 error = ioctl(fd, I2CSTOP, &cmd); 510 if (error == -1) 511 fprintf(stderr, "error sending stop condtion\n"); 512 err2: 513 if (err_msg) 514 fprintf(stderr, "%s", err_msg); 515 516 close(fd); 517 return (1); 518 } 519 520 int 521 main(int argc, char** argv) 522 { 523 struct iiccmd cmd; 524 struct options i2c_opt; 525 char *dev, *skip_addr, *i2c_buf; 526 int error, chunk_size, i, j, ch; 527 528 errno = 0; 529 error = 0; 530 531 /* Line-break the output every chunk_size bytes */ 532 chunk_size = 16; 533 534 dev = I2C_DEV; 535 536 /* Default values */ 537 i2c_opt.addr_set = 0; 538 i2c_opt.off = 0; 539 i2c_opt.verbose = 0; 540 i2c_opt.dir = 'r'; /* direction = read */ 541 i2c_opt.width = 8; 542 i2c_opt.count = 1; 543 i2c_opt.binary = 0; /* ASCII text output */ 544 i2c_opt.scan = 0; /* no bus scan */ 545 i2c_opt.skip = 0; /* scan all addresses */ 546 i2c_opt.reset = 0; /* no bus reset */ 547 i2c_opt.mode = I2C_MODE_NOTSET; 548 549 while ((ch = getopt(argc, argv, "a:f:d:o:w:c:m:n:sbvrh")) != -1) { 550 switch(ch) { 551 case 'a': 552 i2c_opt.addr = (strtoul(optarg, 0, 16) << 1); 553 if (i2c_opt.addr == 0 && errno == EINVAL) 554 i2c_opt.addr_set = 0; 555 else 556 i2c_opt.addr_set = 1; 557 break; 558 case 'f': 559 dev = optarg; 560 break; 561 case 'd': 562 i2c_opt.dir = optarg[0]; 563 break; 564 case 'o': 565 i2c_opt.off = strtoul(optarg, 0, 16); 566 if (i2c_opt.off == 0 && errno == EINVAL) 567 error = 1; 568 break; 569 case 'w': 570 i2c_opt.width = atoi(optarg); 571 break; 572 case 'c': 573 i2c_opt.count = atoi(optarg); 574 break; 575 case 'm': 576 if (!strcmp(optarg, "no")) 577 i2c_opt.mode = I2C_MODE_NONE; 578 else if (!strcmp(optarg, "ss")) 579 i2c_opt.mode = I2C_MODE_STOP_START; 580 else if (!strcmp(optarg, "rs")) 581 i2c_opt.mode = I2C_MODE_REPEATED_START; 582 else 583 usage(); 584 break; 585 case 'n': 586 i2c_opt.skip = 1; 587 skip_addr = optarg; 588 break; 589 case 's': 590 i2c_opt.scan = 1; 591 break; 592 case 'b': 593 i2c_opt.binary = 1; 594 break; 595 case 'v': 596 i2c_opt.verbose = 1; 597 break; 598 case 'r': 599 i2c_opt.reset = 1; 600 break; 601 case 'h': 602 default: 603 usage(); 604 } 605 } 606 argc -= optind; 607 argv += optind; 608 609 /* Set default mode if option -m is not specified */ 610 if (i2c_opt.mode == I2C_MODE_NOTSET) { 611 if (i2c_opt.dir == 'r') 612 i2c_opt.mode = I2C_MODE_STOP_START; 613 else if (i2c_opt.dir == 'w') 614 i2c_opt.mode = I2C_MODE_NONE; 615 } 616 617 /* Basic sanity check of command line arguments */ 618 if (i2c_opt.scan) { 619 if (i2c_opt.addr_set) 620 usage(); 621 } else if (i2c_opt.reset) { 622 if (i2c_opt.addr_set) 623 usage(); 624 } else if (error) { 625 usage(); 626 } else if ((i2c_opt.dir == 'r' || i2c_opt.dir == 'w')) { 627 if ((i2c_opt.addr_set == 0) || 628 !(i2c_opt.width == 0 || i2c_opt.width == 8 || 629 i2c_opt.width == 16)) 630 usage(); 631 } 632 633 if (i2c_opt.verbose) 634 fprintf(stderr, "dev: %s, addr: 0x%x, r/w: %c, " 635 "offset: 0x%02x, width: %u, count: %u\n", dev, 636 i2c_opt.addr >> 1, i2c_opt.dir, i2c_opt.off, 637 i2c_opt.width, i2c_opt.count); 638 639 if (i2c_opt.scan) 640 exit(scan_bus(cmd, dev, i2c_opt.skip, skip_addr)); 641 642 if (i2c_opt.reset) 643 exit(reset_bus(cmd, dev)); 644 645 i2c_buf = malloc(i2c_opt.count); 646 if (i2c_buf == NULL) 647 err(1, "data malloc"); 648 649 if (i2c_opt.dir == 'w') { 650 error = i2c_write(dev, i2c_opt, i2c_buf); 651 if (error) { 652 free(i2c_buf); 653 return (1); 654 } 655 } 656 if (i2c_opt.dir == 'r') { 657 error = i2c_read(dev, i2c_opt, i2c_buf); 658 if (error) { 659 free(i2c_buf); 660 return (1); 661 } 662 } 663 664 if (i2c_opt.verbose) 665 fprintf(stderr, "\nData %s (hex):\n", i2c_opt.dir == 'r' ? 666 "read" : "written"); 667 668 i = 0; 669 j = 0; 670 while (i < i2c_opt.count) { 671 if (i2c_opt.verbose || (i2c_opt.dir == 'r' && 672 !i2c_opt.binary)) 673 fprintf (stderr, "%02hhx ", i2c_buf[i++]); 674 675 if (i2c_opt.dir == 'r' && i2c_opt.binary) { 676 fprintf(stdout, "%c", i2c_buf[j++]); 677 if(!i2c_opt.verbose) 678 i++; 679 } 680 if (!i2c_opt.verbose && (i2c_opt.dir == 'w')) 681 break; 682 if ((i % chunk_size) == 0) 683 fprintf(stderr, "\n"); 684 } 685 if ((i % chunk_size) != 0) 686 fprintf(stderr, "\n"); 687 688 free(i2c_buf); 689 return (0); 690 } 691