Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 1 | /* IIO - useful set of util functionality |
| 2 | * |
| 3 | * Copyright (c) 2008 Jonathan Cameron |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 as published by |
| 7 | * the Free Software Foundation. |
| 8 | */ |
| 9 | |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 10 | /* Made up value to limit allocation sizes */ |
| 11 | #include <string.h> |
| 12 | #include <stdlib.h> |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame^] | 13 | #include <ctype.h> |
| 14 | #include <stdio.h> |
| 15 | #include <stdint.h> |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 16 | |
| 17 | #define IIO_MAX_NAME_LENGTH 30 |
| 18 | |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame^] | 19 | #define IIO_EV_CLASS_BUFFER 0 |
| 20 | #define IIO_BUFFER_EVENT_CODE(code) \ |
| 21 | (IIO_EV_CLASS_BUFFER | (code << 8)) |
| 22 | |
| 23 | #define IIO_EVENT_CODE_RING_50_FULL IIO_BUFFER_EVENT_CODE(0) |
| 24 | #define IIO_EVENT_CODE_RING_75_FULL IIO_BUFFER_EVENT_CODE(1) |
| 25 | #define IIO_EVENT_CODE_RING_100_FULL IIO_BUFFER_EVENT_CODE(2) |
| 26 | |
| 27 | |
| 28 | #define FORMAT_SCAN_ELEMENTS_DIR "%s:buffer0/scan_elements" |
| 29 | #define FORMAT_TYPE_FILE "%s_type" |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 30 | |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 31 | const char *iio_dir = "/sys/bus/iio/devices/"; |
| 32 | |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 33 | struct iio_event_data { |
| 34 | int id; |
| 35 | __s64 timestamp; |
| 36 | }; |
| 37 | |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 38 | /** |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame^] | 39 | * iioutils_break_up_name() - extract generic name from full channel name |
| 40 | * @full_name: the full channel name |
| 41 | * @generic_name: the output generic channel name |
| 42 | **/ |
| 43 | static int iioutils_break_up_name(const char *full_name, |
| 44 | char **generic_name) |
| 45 | { |
| 46 | char *current; |
| 47 | char *w, *r; |
| 48 | char *working; |
| 49 | current = strdup(full_name); |
| 50 | working = strtok(current, "_\0"); |
| 51 | w = working; |
| 52 | r = working; |
| 53 | |
| 54 | while(*r != '\0') { |
| 55 | if (!isdigit(*r)) { |
| 56 | *w = *r; |
| 57 | w++; |
| 58 | } |
| 59 | r++; |
| 60 | } |
| 61 | *w = '\0'; |
| 62 | *generic_name = strdup(working); |
| 63 | free(current); |
| 64 | |
| 65 | return 0; |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * struct iio_channel_info - information about a given channel |
| 70 | * @name: channel name |
| 71 | * @generic_name: general name for channel type |
| 72 | * @scale: scale factor to be applied for conversion to si units |
| 73 | * @offset: offset to be applied for conversion to si units |
| 74 | * @index: the channel index in the buffer output |
| 75 | * @bytes: number of bytes occupied in buffer output |
| 76 | * @mask: a bit mask for the raw output |
| 77 | * @is_signed: is the raw value stored signed |
| 78 | * @enabled: is this channel enabled |
| 79 | **/ |
| 80 | struct iio_channel_info { |
| 81 | char *name; |
| 82 | char *generic_name; |
| 83 | float scale; |
| 84 | float offset; |
| 85 | unsigned index; |
| 86 | unsigned bytes; |
| 87 | unsigned bits_used; |
| 88 | uint64_t mask; |
| 89 | unsigned is_signed; |
| 90 | unsigned enabled; |
| 91 | unsigned location; |
| 92 | }; |
| 93 | |
| 94 | /** |
| 95 | * iioutils_get_type() - find and process _type attribute data |
| 96 | * @is_signed: output whether channel is signed |
| 97 | * @bytes: output how many bytes the channel storage occupies |
| 98 | * @mask: output a bit mask for the raw data |
| 99 | * @device_dir: the iio device directory |
| 100 | * @name: the channel name |
| 101 | * @generic_name: the channel type name |
| 102 | **/ |
| 103 | inline int iioutils_get_type(unsigned *is_signed, |
| 104 | unsigned *bytes, |
| 105 | unsigned *bits_used, |
| 106 | uint64_t *mask, |
| 107 | const char *device_dir, |
| 108 | const char *name, |
| 109 | const char *generic_name) |
| 110 | { |
| 111 | FILE *sysfsfp; |
| 112 | int ret; |
| 113 | DIR *dp; |
| 114 | char *scan_el_dir, *builtname, *builtname_generic, *filename = 0; |
| 115 | char signchar; |
| 116 | unsigned sizeint, padint; |
| 117 | const struct dirent *ent; |
| 118 | |
| 119 | ret = asprintf(&scan_el_dir, FORMAT_SCAN_ELEMENTS_DIR, device_dir); |
| 120 | if (ret < 0) { |
| 121 | ret = -ENOMEM; |
| 122 | goto error_ret; |
| 123 | } |
| 124 | ret = asprintf(&builtname, FORMAT_TYPE_FILE, name); |
| 125 | if (ret < 0) { |
| 126 | ret = -ENOMEM; |
| 127 | goto error_free_scan_el_dir; |
| 128 | } |
| 129 | ret = asprintf(&builtname_generic, FORMAT_TYPE_FILE, generic_name); |
| 130 | if (ret < 0) { |
| 131 | ret = -ENOMEM; |
| 132 | goto error_free_builtname; |
| 133 | } |
| 134 | |
| 135 | dp = opendir(scan_el_dir); |
| 136 | if (dp == NULL) { |
| 137 | ret = -errno; |
| 138 | goto error_free_builtname_generic; |
| 139 | } |
| 140 | while (ent = readdir(dp), ent != NULL) |
| 141 | /* |
| 142 | * Do we allow devices to override a generic name with |
| 143 | * a specific one? |
| 144 | */ |
| 145 | if ((strcmp(builtname, ent->d_name) == 0) || |
| 146 | (strcmp(builtname_generic, ent->d_name) == 0)) { |
| 147 | ret = asprintf(&filename, |
| 148 | "%s/%s", scan_el_dir, ent->d_name); |
| 149 | if (ret < 0) { |
| 150 | ret = -ENOMEM; |
| 151 | goto error_closedir; |
| 152 | } |
| 153 | sysfsfp = fopen(filename, "r"); |
| 154 | if (sysfsfp == NULL) { |
| 155 | printf("failed to open %s\n", filename); |
| 156 | ret = -errno; |
| 157 | goto error_free_filename; |
| 158 | } |
| 159 | fscanf(sysfsfp, |
| 160 | "%c%u/%u", &signchar, bits_used, &padint); |
| 161 | *bytes = padint / 8; |
| 162 | if (sizeint == 64) |
| 163 | *mask = ~0; |
| 164 | else |
| 165 | *mask = (1 << *bits_used) - 1; |
| 166 | if (signchar == 's') |
| 167 | *is_signed = 1; |
| 168 | else |
| 169 | *is_signed = 0; |
| 170 | } |
| 171 | error_free_filename: |
| 172 | if (filename) |
| 173 | free(filename); |
| 174 | error_closedir: |
| 175 | closedir(dp); |
| 176 | error_free_builtname_generic: |
| 177 | free(builtname_generic); |
| 178 | error_free_builtname: |
| 179 | free(builtname); |
| 180 | error_free_scan_el_dir: |
| 181 | free(scan_el_dir); |
| 182 | error_ret: |
| 183 | return ret; |
| 184 | } |
| 185 | |
| 186 | inline int iioutils_get_param_float(float *output, |
| 187 | const char *param_name, |
| 188 | const char *device_dir, |
| 189 | const char *name, |
| 190 | const char *generic_name) |
| 191 | { |
| 192 | FILE *sysfsfp; |
| 193 | int ret; |
| 194 | DIR *dp; |
| 195 | char *builtname, *builtname_generic; |
| 196 | char *filename = NULL; |
| 197 | const struct dirent *ent; |
| 198 | |
| 199 | ret = asprintf(&builtname, "%s_%s", name, param_name); |
| 200 | if (ret < 0) { |
| 201 | ret = -ENOMEM; |
| 202 | goto error_ret; |
| 203 | } |
| 204 | ret = asprintf(&builtname_generic, |
| 205 | "%s_%s", generic_name, param_name); |
| 206 | if (ret < 0) { |
| 207 | ret = -ENOMEM; |
| 208 | goto error_free_builtname; |
| 209 | } |
| 210 | dp = opendir(device_dir); |
| 211 | if (dp == NULL) { |
| 212 | ret = -errno; |
| 213 | goto error_free_builtname_generic; |
| 214 | } |
| 215 | while (ent = readdir(dp), ent != NULL) |
| 216 | if ((strcmp(builtname, ent->d_name) == 0) || |
| 217 | (strcmp(builtname_generic, ent->d_name) == 0)) { |
| 218 | ret = asprintf(&filename, |
| 219 | "%s/%s", device_dir, ent->d_name); |
| 220 | if (ret < 0) { |
| 221 | ret = -ENOMEM; |
| 222 | goto error_closedir; |
| 223 | } |
| 224 | sysfsfp = fopen(filename, "r"); |
| 225 | if (!sysfsfp) { |
| 226 | ret = -errno; |
| 227 | goto error_free_filename; |
| 228 | } |
| 229 | fscanf(sysfsfp, "%f", output); |
| 230 | break; |
| 231 | } |
| 232 | error_free_filename: |
| 233 | if (filename) |
| 234 | free(filename); |
| 235 | error_closedir: |
| 236 | closedir(dp); |
| 237 | error_free_builtname_generic: |
| 238 | free(builtname_generic); |
| 239 | error_free_builtname: |
| 240 | free(builtname); |
| 241 | error_ret: |
| 242 | return ret; |
| 243 | } |
| 244 | |
| 245 | |
| 246 | /** |
| 247 | * build_channel_array() - function to figure out what channels are present |
| 248 | * @device_dir: the IIO device directory in sysfs |
| 249 | * @ |
| 250 | **/ |
| 251 | inline int build_channel_array(const char *device_dir, |
| 252 | struct iio_channel_info **ci_array, |
| 253 | int *counter) |
| 254 | { |
| 255 | DIR *dp; |
| 256 | FILE *sysfsfp; |
| 257 | int count = 0, temp, i; |
| 258 | struct iio_channel_info *current; |
| 259 | int ret; |
| 260 | const struct dirent *ent; |
| 261 | char *scan_el_dir; |
| 262 | char *filename; |
| 263 | |
| 264 | *counter = 0; |
| 265 | ret = asprintf(&scan_el_dir, FORMAT_SCAN_ELEMENTS_DIR, device_dir); |
| 266 | if (ret < 0) { |
| 267 | ret = -ENOMEM; |
| 268 | goto error_ret; |
| 269 | } |
| 270 | dp = opendir(scan_el_dir); |
| 271 | if (dp == NULL) { |
| 272 | ret = -errno; |
| 273 | goto error_free_name; |
| 274 | } |
| 275 | while (ent = readdir(dp), ent != NULL) |
| 276 | if (strcmp(ent->d_name + strlen(ent->d_name) - strlen("_en"), |
| 277 | "_en") == 0) { |
| 278 | ret = asprintf(&filename, |
| 279 | "%s/%s", scan_el_dir, ent->d_name); |
| 280 | if (ret < 0) { |
| 281 | ret = -ENOMEM; |
| 282 | goto error_close_dir; |
| 283 | } |
| 284 | sysfsfp = fopen(filename, "r"); |
| 285 | if (sysfsfp == NULL) { |
| 286 | ret = -errno; |
| 287 | free(filename); |
| 288 | goto error_close_dir; |
| 289 | } |
| 290 | fscanf(sysfsfp, "%u", &ret); |
| 291 | if (ret == 1) |
| 292 | (*counter)++; |
| 293 | fclose(sysfsfp); |
| 294 | free(filename); |
| 295 | } |
| 296 | *ci_array = malloc(sizeof(**ci_array)*(*counter)); |
| 297 | if (*ci_array == NULL) { |
| 298 | ret = -ENOMEM; |
| 299 | goto error_close_dir; |
| 300 | } |
| 301 | seekdir(dp, 0); |
| 302 | while (ent = readdir(dp), ent != NULL) { |
| 303 | if (strcmp(ent->d_name + strlen(ent->d_name) - strlen("_en"), |
| 304 | "_en") == 0) { |
| 305 | current = &(*ci_array)[count++]; |
| 306 | ret = asprintf(&filename, |
| 307 | "%s/%s", scan_el_dir, ent->d_name); |
| 308 | if (ret < 0) { |
| 309 | ret = -ENOMEM; |
| 310 | /* decrement count to avoid freeing name */ |
| 311 | count--; |
| 312 | goto error_cleanup_array; |
| 313 | } |
| 314 | sysfsfp = fopen(filename, "r"); |
| 315 | if (sysfsfp == NULL) { |
| 316 | free(filename); |
| 317 | ret = -errno; |
| 318 | goto error_cleanup_array; |
| 319 | } |
| 320 | fscanf(sysfsfp, "%u", ¤t->enabled); |
| 321 | fclose(sysfsfp); |
| 322 | free(filename); |
| 323 | current->scale = 1.0; |
| 324 | current->offset = 0; |
| 325 | current->name = strndup(ent->d_name, |
| 326 | strlen(ent->d_name) - |
| 327 | strlen("_en")); |
| 328 | if (current->name == NULL) { |
| 329 | free(filename); |
| 330 | ret = -ENOMEM; |
| 331 | goto error_cleanup_array; |
| 332 | } |
| 333 | /* Get the generic and specific name elements */ |
| 334 | ret = iioutils_break_up_name(current->name, |
| 335 | ¤t->generic_name); |
| 336 | if (ret) { |
| 337 | free(filename); |
| 338 | goto error_cleanup_array; |
| 339 | } |
| 340 | ret = asprintf(&filename, |
| 341 | "%s/%s_index", |
| 342 | scan_el_dir, |
| 343 | current->name); |
| 344 | if (ret < 0) { |
| 345 | free(filename); |
| 346 | ret = -ENOMEM; |
| 347 | goto error_cleanup_array; |
| 348 | } |
| 349 | sysfsfp = fopen(filename, "r"); |
| 350 | fscanf(sysfsfp, "%u", ¤t->index); |
| 351 | fclose(sysfsfp); |
| 352 | free(filename); |
| 353 | /* Find the scale */ |
| 354 | ret = iioutils_get_param_float(¤t->scale, |
| 355 | "scale", |
| 356 | device_dir, |
| 357 | current->name, |
| 358 | current->generic_name); |
| 359 | if (ret < 0) |
| 360 | goto error_cleanup_array; |
| 361 | ret = iioutils_get_param_float(¤t->offset, |
| 362 | "offset", |
| 363 | device_dir, |
| 364 | current->name, |
| 365 | current->generic_name); |
| 366 | if (ret < 0) |
| 367 | goto error_cleanup_array; |
| 368 | ret = iioutils_get_type(¤t->is_signed, |
| 369 | ¤t->bytes, |
| 370 | ¤t->bits_used, |
| 371 | ¤t->mask, |
| 372 | device_dir, |
| 373 | current->name, |
| 374 | current->generic_name); |
| 375 | } |
| 376 | } |
| 377 | /* reorder so that the array is in index order*/ |
| 378 | current = malloc(sizeof(**ci_array)**counter); |
| 379 | if (current == NULL) { |
| 380 | ret = -ENOMEM; |
| 381 | goto error_cleanup_array; |
| 382 | } |
| 383 | closedir(dp); |
| 384 | count = 0; |
| 385 | temp = 0; |
| 386 | while (count < *counter) |
| 387 | for (i = 0; i < *counter; i++) |
| 388 | if ((*ci_array)[i].index == temp) { |
| 389 | memcpy(¤t[count++], |
| 390 | &(*ci_array)[i], |
| 391 | sizeof(*current)); |
| 392 | temp++; |
| 393 | break; |
| 394 | } |
| 395 | free(*ci_array); |
| 396 | *ci_array = current; |
| 397 | |
| 398 | return 0; |
| 399 | |
| 400 | error_cleanup_array: |
| 401 | for (i = count - 1; i >= 0; i++) |
| 402 | free((*ci_array)[i].name); |
| 403 | free(*ci_array); |
| 404 | error_close_dir: |
| 405 | closedir(dp); |
| 406 | error_free_name: |
| 407 | free(scan_el_dir); |
| 408 | error_ret: |
| 409 | return ret; |
| 410 | } |
| 411 | |
| 412 | /** |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 413 | * find_type_by_name() - function to match top level types by name |
| 414 | * @name: top level type instance name |
| 415 | * @type: the type of top level instance being sort |
| 416 | * |
| 417 | * Typical types this is used for are device and trigger. |
| 418 | **/ |
| 419 | inline int find_type_by_name(const char *name, const char *type) |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 420 | { |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 421 | const struct dirent *ent; |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 422 | int number, numstrlen; |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 423 | |
| 424 | FILE *nameFile; |
| 425 | DIR *dp; |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 426 | char thisname[IIO_MAX_NAME_LENGTH]; |
| 427 | char *filename; |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 428 | |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 429 | dp = opendir(iio_dir); |
| 430 | if (dp == NULL) { |
| 431 | printf("No industrialio devices available"); |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 432 | return -ENODEV; |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 433 | } |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 434 | |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 435 | while (ent = readdir(dp), ent != NULL) { |
| 436 | if (strcmp(ent->d_name, ".") != 0 && |
| 437 | strcmp(ent->d_name, "..") != 0 && |
| 438 | strlen(ent->d_name) > strlen(type) && |
| 439 | strncmp(ent->d_name, type, strlen(type)) == 0) { |
| 440 | numstrlen = sscanf(ent->d_name + strlen(type), |
| 441 | "%d", |
| 442 | &number); |
| 443 | /* verify the next character is not a colon */ |
| 444 | if (strncmp(ent->d_name + strlen(type) + numstrlen, |
| 445 | ":", |
| 446 | 1) != 0) { |
| 447 | filename = malloc(strlen(iio_dir) |
| 448 | + strlen(type) |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 449 | + numstrlen |
Barry Song | b6ee30a | 2010-05-25 17:40:04 +0800 | [diff] [blame] | 450 | + 6); |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 451 | if (filename == NULL) |
| 452 | return -ENOMEM; |
| 453 | sprintf(filename, "%s%s%d/name", |
| 454 | iio_dir, |
| 455 | type, |
| 456 | number); |
| 457 | nameFile = fopen(filename, "r"); |
| 458 | if (!nameFile) |
| 459 | continue; |
| 460 | free(filename); |
| 461 | fscanf(nameFile, "%s", thisname); |
| 462 | if (strcmp(name, thisname) == 0) |
| 463 | return number; |
| 464 | fclose(nameFile); |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 465 | } |
| 466 | } |
| 467 | } |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 468 | return -ENODEV; |
| 469 | } |
| 470 | |
| 471 | inline int _write_sysfs_int(char *filename, char *basedir, int val, int verify) |
| 472 | { |
| 473 | int ret; |
| 474 | FILE *sysfsfp; |
| 475 | int test; |
| 476 | char *temp = malloc(strlen(basedir) + strlen(filename) + 2); |
| 477 | if (temp == NULL) |
| 478 | return -ENOMEM; |
| 479 | sprintf(temp, "%s/%s", basedir, filename); |
| 480 | sysfsfp = fopen(temp, "w"); |
| 481 | if (sysfsfp == NULL) { |
| 482 | printf("failed to open %s\n", temp); |
| 483 | ret = -errno; |
| 484 | goto error_free; |
| 485 | } |
| 486 | fprintf(sysfsfp, "%d", val); |
| 487 | fclose(sysfsfp); |
| 488 | if (verify) { |
| 489 | sysfsfp = fopen(temp, "r"); |
| 490 | if (sysfsfp == NULL) { |
| 491 | printf("failed to open %s\n", temp); |
| 492 | ret = -errno; |
| 493 | goto error_free; |
| 494 | } |
| 495 | fscanf(sysfsfp, "%d", &test); |
| 496 | if (test != val) { |
| 497 | printf("Possible failure in int write %d to %s%s\n", |
| 498 | val, |
| 499 | basedir, |
| 500 | filename); |
| 501 | ret = -1; |
| 502 | } |
| 503 | } |
| 504 | error_free: |
| 505 | free(temp); |
| 506 | return ret; |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 507 | } |
| 508 | |
| 509 | int write_sysfs_int(char *filename, char *basedir, int val) |
| 510 | { |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 511 | return _write_sysfs_int(filename, basedir, val, 0); |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 512 | } |
| 513 | |
Jonathan Cameron | eaf86ff | 2010-05-04 14:43:04 +0100 | [diff] [blame] | 514 | int write_sysfs_int_and_verify(char *filename, char *basedir, int val) |
| 515 | { |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 516 | return _write_sysfs_int(filename, basedir, val, 1); |
Jonathan Cameron | eaf86ff | 2010-05-04 14:43:04 +0100 | [diff] [blame] | 517 | } |
| 518 | |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 519 | int _write_sysfs_string(char *filename, char *basedir, char *val, int verify) |
| 520 | { |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame^] | 521 | int ret = 0; |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 522 | FILE *sysfsfp; |
| 523 | char *temp = malloc(strlen(basedir) + strlen(filename) + 2); |
| 524 | if (temp == NULL) { |
| 525 | printf("Memory allocation failed\n"); |
| 526 | return -ENOMEM; |
| 527 | } |
| 528 | sprintf(temp, "%s/%s", basedir, filename); |
| 529 | sysfsfp = fopen(temp, "w"); |
| 530 | if (sysfsfp == NULL) { |
| 531 | printf("Could not open %s\n", temp); |
| 532 | ret = -errno; |
| 533 | goto error_free; |
| 534 | } |
| 535 | fprintf(sysfsfp, "%s", val); |
| 536 | fclose(sysfsfp); |
| 537 | if (verify) { |
| 538 | sysfsfp = fopen(temp, "r"); |
| 539 | if (sysfsfp == NULL) { |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame^] | 540 | printf("could not open file to verify\n"); |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 541 | ret = -errno; |
| 542 | goto error_free; |
| 543 | } |
| 544 | fscanf(sysfsfp, "%s", temp); |
| 545 | if (strcmp(temp, val) != 0) { |
| 546 | printf("Possible failure in string write of %s " |
| 547 | "Should be %s " |
| 548 | "writen to %s\%s\n", |
| 549 | temp, |
| 550 | val, |
| 551 | basedir, |
| 552 | filename); |
| 553 | ret = -1; |
| 554 | } |
| 555 | } |
| 556 | error_free: |
| 557 | free(temp); |
| 558 | |
| 559 | return ret; |
| 560 | } |
Jonathan Cameron | e58537c | 2010-10-08 12:14:14 +0100 | [diff] [blame^] | 561 | |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 562 | /** |
| 563 | * write_sysfs_string_and_verify() - string write, readback and verify |
| 564 | * @filename: name of file to write to |
| 565 | * @basedir: the sysfs directory in which the file is to be found |
| 566 | * @val: the string to write |
| 567 | **/ |
| 568 | int write_sysfs_string_and_verify(char *filename, char *basedir, char *val) |
| 569 | { |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 570 | return _write_sysfs_string(filename, basedir, val, 1); |
| 571 | } |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 572 | |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 573 | int write_sysfs_string(char *filename, char *basedir, char *val) |
| 574 | { |
| 575 | return _write_sysfs_string(filename, basedir, val, 0); |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 576 | } |
| 577 | |
| 578 | int read_sysfs_posint(char *filename, char *basedir) |
| 579 | { |
| 580 | int ret; |
| 581 | FILE *sysfsfp; |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 582 | char *temp = malloc(strlen(basedir) + strlen(filename) + 2); |
| 583 | if (temp == NULL) { |
| 584 | printf("Memory allocation failed"); |
| 585 | return -ENOMEM; |
| 586 | } |
| 587 | sprintf(temp, "%s/%s", basedir, filename); |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 588 | sysfsfp = fopen(temp, "r"); |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 589 | if (sysfsfp == NULL) { |
| 590 | ret = -errno; |
| 591 | goto error_free; |
| 592 | } |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 593 | fscanf(sysfsfp, "%d\n", &ret); |
| 594 | fclose(sysfsfp); |
Jonathan Cameron | 9d8ae6c | 2010-05-04 14:43:13 +0100 | [diff] [blame] | 595 | error_free: |
| 596 | free(temp); |
| 597 | return ret; |
| 598 | } |
| 599 | |
| 600 | int read_sysfs_float(char *filename, char *basedir, float *val) |
| 601 | { |
| 602 | float ret = 0; |
| 603 | FILE *sysfsfp; |
| 604 | char *temp = malloc(strlen(basedir) + strlen(filename) + 2); |
| 605 | if (temp == NULL) { |
| 606 | printf("Memory allocation failed"); |
| 607 | return -ENOMEM; |
| 608 | } |
| 609 | sprintf(temp, "%s/%s", basedir, filename); |
| 610 | sysfsfp = fopen(temp, "r"); |
| 611 | if (sysfsfp == NULL) { |
| 612 | ret = -errno; |
| 613 | goto error_free; |
| 614 | } |
| 615 | fscanf(sysfsfp, "%f\n", val); |
| 616 | fclose(sysfsfp); |
| 617 | error_free: |
| 618 | free(temp); |
Jonathan Cameron | c57f1ba | 2009-08-18 18:06:32 +0100 | [diff] [blame] | 619 | return ret; |
| 620 | } |