Jon Medhurst | aaf37a3 | 2013-06-11 12:10:56 +0100 | [diff] [blame] | 1 | /* |
| 2 | sysfs.c - Part of libsensors, a library for reading Linux sensor data |
| 3 | Copyright (c) 2005 Mark M. Hoffman <mhoffman@lightlink.com> |
| 4 | Copyright (C) 2007-2010 Jean Delvare <khali@linux-fr.org> |
| 5 | |
| 6 | This library is free software; you can redistribute it and/or |
| 7 | modify it under the terms of the GNU Lesser General Public |
| 8 | License as published by the Free Software Foundation; either |
| 9 | version 2.1 of the License, or (at your option) any later version. |
| 10 | |
| 11 | This library is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU Lesser General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, |
| 19 | MA 02110-1301 USA. |
| 20 | */ |
| 21 | |
| 22 | /*** This file modified by ARM on Jan 23, 2013 to improve performance by substituting calls to fread() with calls to read() and to read non-scaled values. ***/ |
| 23 | |
| 24 | /* this define needed for strndup() */ |
| 25 | #define _GNU_SOURCE |
| 26 | |
| 27 | #include <sys/types.h> |
| 28 | #include <sys/stat.h> |
| 29 | #include <sys/vfs.h> |
| 30 | #include <unistd.h> |
| 31 | #include <string.h> |
| 32 | #include <stdlib.h> |
| 33 | #include <limits.h> |
| 34 | #include <errno.h> |
| 35 | #include <dirent.h> |
| 36 | #include <fcntl.h> |
| 37 | #include "data.h" |
| 38 | #include "error.h" |
| 39 | #include "access.h" |
| 40 | #include "general.h" |
| 41 | #include "sysfs.h" |
| 42 | |
| 43 | |
| 44 | /****************************************************************************/ |
| 45 | |
| 46 | #define ATTR_MAX 128 |
| 47 | #define SYSFS_MAGIC 0x62656572 |
| 48 | |
| 49 | int sensors_sysfs_no_scaling; |
| 50 | |
| 51 | /* |
| 52 | * Read an attribute from sysfs |
| 53 | * Returns a pointer to a freshly allocated string; free it yourself. |
| 54 | * If the file doesn't exist or can't be read, NULL is returned. |
| 55 | */ |
| 56 | static char *sysfs_read_attr(const char *device, const char *attr) |
| 57 | { |
| 58 | char path[NAME_MAX]; |
| 59 | char buf[ATTR_MAX], *p; |
| 60 | FILE *f; |
| 61 | |
| 62 | snprintf(path, NAME_MAX, "%s/%s", device, attr); |
| 63 | |
| 64 | if (!(f = fopen(path, "r"))) |
| 65 | return NULL; |
| 66 | p = fgets(buf, ATTR_MAX, f); |
| 67 | fclose(f); |
| 68 | if (!p) |
| 69 | return NULL; |
| 70 | |
| 71 | /* Last byte is a '\n'; chop that off */ |
| 72 | p = strndup(buf, strlen(buf) - 1); |
| 73 | if (!p) |
| 74 | sensors_fatal_error(__func__, "Out of memory"); |
| 75 | return p; |
| 76 | } |
| 77 | |
| 78 | /* |
| 79 | * Call an arbitrary function for each class device of the given class |
| 80 | * Returns 0 on success (all calls returned 0), a positive errno for |
| 81 | * local errors, or a negative error value if any call fails. |
| 82 | */ |
| 83 | static int sysfs_foreach_classdev(const char *class_name, |
| 84 | int (*func)(const char *, const char *)) |
| 85 | { |
| 86 | char path[NAME_MAX]; |
| 87 | int path_off, ret; |
| 88 | DIR *dir; |
| 89 | struct dirent *ent; |
| 90 | |
| 91 | path_off = snprintf(path, NAME_MAX, "%s/class/%s", |
| 92 | sensors_sysfs_mount, class_name); |
| 93 | if (!(dir = opendir(path))) |
| 94 | return errno; |
| 95 | |
| 96 | ret = 0; |
| 97 | while (!ret && (ent = readdir(dir))) { |
| 98 | if (ent->d_name[0] == '.') /* skip hidden entries */ |
| 99 | continue; |
| 100 | |
| 101 | snprintf(path + path_off, NAME_MAX - path_off, "/%s", |
| 102 | ent->d_name); |
| 103 | ret = func(path, ent->d_name); |
| 104 | } |
| 105 | |
| 106 | closedir(dir); |
| 107 | return ret; |
| 108 | } |
| 109 | |
| 110 | /* |
| 111 | * Call an arbitrary function for each device of the given bus type |
| 112 | * Returns 0 on success (all calls returned 0), a positive errno for |
| 113 | * local errors, or a negative error value if any call fails. |
| 114 | */ |
| 115 | static int sysfs_foreach_busdev(const char *bus_type, |
| 116 | int (*func)(const char *, const char *)) |
| 117 | { |
| 118 | char path[NAME_MAX]; |
| 119 | int path_off, ret; |
| 120 | DIR *dir; |
| 121 | struct dirent *ent; |
| 122 | |
| 123 | path_off = snprintf(path, NAME_MAX, "%s/bus/%s/devices", |
| 124 | sensors_sysfs_mount, bus_type); |
| 125 | if (!(dir = opendir(path))) |
| 126 | return errno; |
| 127 | |
| 128 | ret = 0; |
| 129 | while (!ret && (ent = readdir(dir))) { |
| 130 | if (ent->d_name[0] == '.') /* skip hidden entries */ |
| 131 | continue; |
| 132 | |
| 133 | snprintf(path + path_off, NAME_MAX - path_off, "/%s", |
| 134 | ent->d_name); |
| 135 | ret = func(path, ent->d_name); |
| 136 | } |
| 137 | |
| 138 | closedir(dir); |
| 139 | return ret; |
| 140 | } |
| 141 | |
| 142 | /****************************************************************************/ |
| 143 | |
| 144 | char sensors_sysfs_mount[NAME_MAX]; |
| 145 | |
| 146 | #define MAX_MAIN_SENSOR_TYPES (SENSORS_FEATURE_MAX_MAIN - SENSORS_FEATURE_IN) |
| 147 | #define MAX_OTHER_SENSOR_TYPES (SENSORS_FEATURE_MAX_OTHER - SENSORS_FEATURE_VID) |
| 148 | #define MAX_SENSORS_PER_TYPE 24 |
| 149 | /* max_subfeatures is now computed dynamically */ |
| 150 | #define FEATURE_SIZE (max_subfeatures * 2) |
| 151 | #define FEATURE_TYPE_SIZE (MAX_SENSORS_PER_TYPE * FEATURE_SIZE) |
| 152 | |
| 153 | /* |
| 154 | * Room for all 7 main types (in, fan, temp, power, energy, current, humidity) |
| 155 | * and 2 other types (VID, intrusion) with all their subfeatures + misc features |
| 156 | */ |
| 157 | #define SUB_OFFSET_OTHER (MAX_MAIN_SENSOR_TYPES * FEATURE_TYPE_SIZE) |
| 158 | #define SUB_OFFSET_MISC (SUB_OFFSET_OTHER + \ |
| 159 | MAX_OTHER_SENSOR_TYPES * FEATURE_TYPE_SIZE) |
| 160 | #define ALL_POSSIBLE_SUBFEATURES (SUB_OFFSET_MISC + 1) |
| 161 | |
| 162 | static |
| 163 | int get_type_scaling(sensors_subfeature_type type) |
| 164 | { |
| 165 | /* Multipliers for subfeatures */ |
| 166 | switch (type & 0xFF80) { |
| 167 | case SENSORS_SUBFEATURE_IN_INPUT: |
| 168 | case SENSORS_SUBFEATURE_TEMP_INPUT: |
| 169 | case SENSORS_SUBFEATURE_CURR_INPUT: |
| 170 | case SENSORS_SUBFEATURE_HUMIDITY_INPUT: |
| 171 | return 1000; |
| 172 | case SENSORS_SUBFEATURE_FAN_INPUT: |
| 173 | return 1; |
| 174 | case SENSORS_SUBFEATURE_POWER_AVERAGE: |
| 175 | case SENSORS_SUBFEATURE_ENERGY_INPUT: |
| 176 | return 1000000; |
| 177 | } |
| 178 | |
| 179 | /* Multipliers for second class subfeatures |
| 180 | that need their own multiplier */ |
| 181 | switch (type) { |
| 182 | case SENSORS_SUBFEATURE_POWER_AVERAGE_INTERVAL: |
| 183 | case SENSORS_SUBFEATURE_VID: |
| 184 | case SENSORS_SUBFEATURE_TEMP_OFFSET: |
| 185 | return 1000; |
| 186 | default: |
| 187 | return 1; |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | static |
| 192 | char *get_feature_name(sensors_feature_type ftype, char *sfname) |
| 193 | { |
| 194 | char *name, *underscore; |
| 195 | |
| 196 | switch (ftype) { |
| 197 | case SENSORS_FEATURE_IN: |
| 198 | case SENSORS_FEATURE_FAN: |
| 199 | case SENSORS_FEATURE_TEMP: |
| 200 | case SENSORS_FEATURE_POWER: |
| 201 | case SENSORS_FEATURE_ENERGY: |
| 202 | case SENSORS_FEATURE_CURR: |
| 203 | case SENSORS_FEATURE_HUMIDITY: |
| 204 | case SENSORS_FEATURE_INTRUSION: |
| 205 | underscore = strchr(sfname, '_'); |
| 206 | name = strndup(sfname, underscore - sfname); |
| 207 | if (!name) |
| 208 | sensors_fatal_error(__func__, "Out of memory"); |
| 209 | |
| 210 | break; |
| 211 | default: |
| 212 | name = strdup(sfname); |
| 213 | if (!name) |
| 214 | sensors_fatal_error(__func__, "Out of memory"); |
| 215 | } |
| 216 | |
| 217 | return name; |
| 218 | } |
| 219 | |
| 220 | /* Static mappings for use by sensors_subfeature_get_type() */ |
| 221 | struct subfeature_type_match |
| 222 | { |
| 223 | const char *name; |
| 224 | sensors_subfeature_type type; |
| 225 | }; |
| 226 | |
| 227 | struct feature_type_match |
| 228 | { |
| 229 | const char *name; |
| 230 | const struct subfeature_type_match *submatches; |
| 231 | }; |
| 232 | |
| 233 | static const struct subfeature_type_match temp_matches[] = { |
| 234 | { "input", SENSORS_SUBFEATURE_TEMP_INPUT }, |
| 235 | { "max", SENSORS_SUBFEATURE_TEMP_MAX }, |
| 236 | { "max_hyst", SENSORS_SUBFEATURE_TEMP_MAX_HYST }, |
| 237 | { "min", SENSORS_SUBFEATURE_TEMP_MIN }, |
| 238 | { "crit", SENSORS_SUBFEATURE_TEMP_CRIT }, |
| 239 | { "crit_hyst", SENSORS_SUBFEATURE_TEMP_CRIT_HYST }, |
| 240 | { "lcrit", SENSORS_SUBFEATURE_TEMP_LCRIT }, |
| 241 | { "emergency", SENSORS_SUBFEATURE_TEMP_EMERGENCY }, |
| 242 | { "emergency_hyst", SENSORS_SUBFEATURE_TEMP_EMERGENCY_HYST }, |
| 243 | { "lowest", SENSORS_SUBFEATURE_TEMP_LOWEST }, |
| 244 | { "highest", SENSORS_SUBFEATURE_TEMP_HIGHEST }, |
| 245 | { "alarm", SENSORS_SUBFEATURE_TEMP_ALARM }, |
| 246 | { "min_alarm", SENSORS_SUBFEATURE_TEMP_MIN_ALARM }, |
| 247 | { "max_alarm", SENSORS_SUBFEATURE_TEMP_MAX_ALARM }, |
| 248 | { "crit_alarm", SENSORS_SUBFEATURE_TEMP_CRIT_ALARM }, |
| 249 | { "emergency_alarm", SENSORS_SUBFEATURE_TEMP_EMERGENCY_ALARM }, |
| 250 | { "lcrit_alarm", SENSORS_SUBFEATURE_TEMP_LCRIT_ALARM }, |
| 251 | { "fault", SENSORS_SUBFEATURE_TEMP_FAULT }, |
| 252 | { "type", SENSORS_SUBFEATURE_TEMP_TYPE }, |
| 253 | { "offset", SENSORS_SUBFEATURE_TEMP_OFFSET }, |
| 254 | { "beep", SENSORS_SUBFEATURE_TEMP_BEEP }, |
| 255 | { NULL, 0 } |
| 256 | }; |
| 257 | |
| 258 | static const struct subfeature_type_match in_matches[] = { |
| 259 | { "input", SENSORS_SUBFEATURE_IN_INPUT }, |
| 260 | { "min", SENSORS_SUBFEATURE_IN_MIN }, |
| 261 | { "max", SENSORS_SUBFEATURE_IN_MAX }, |
| 262 | { "lcrit", SENSORS_SUBFEATURE_IN_LCRIT }, |
| 263 | { "crit", SENSORS_SUBFEATURE_IN_CRIT }, |
| 264 | { "average", SENSORS_SUBFEATURE_IN_AVERAGE }, |
| 265 | { "lowest", SENSORS_SUBFEATURE_IN_LOWEST }, |
| 266 | { "highest", SENSORS_SUBFEATURE_IN_HIGHEST }, |
| 267 | { "alarm", SENSORS_SUBFEATURE_IN_ALARM }, |
| 268 | { "min_alarm", SENSORS_SUBFEATURE_IN_MIN_ALARM }, |
| 269 | { "max_alarm", SENSORS_SUBFEATURE_IN_MAX_ALARM }, |
| 270 | { "lcrit_alarm", SENSORS_SUBFEATURE_IN_LCRIT_ALARM }, |
| 271 | { "crit_alarm", SENSORS_SUBFEATURE_IN_CRIT_ALARM }, |
| 272 | { "beep", SENSORS_SUBFEATURE_IN_BEEP }, |
| 273 | { NULL, 0 } |
| 274 | }; |
| 275 | |
| 276 | static const struct subfeature_type_match fan_matches[] = { |
| 277 | { "input", SENSORS_SUBFEATURE_FAN_INPUT }, |
| 278 | { "min", SENSORS_SUBFEATURE_FAN_MIN }, |
| 279 | { "max", SENSORS_SUBFEATURE_FAN_MAX }, |
| 280 | { "div", SENSORS_SUBFEATURE_FAN_DIV }, |
| 281 | { "pulses", SENSORS_SUBFEATURE_FAN_PULSES }, |
| 282 | { "alarm", SENSORS_SUBFEATURE_FAN_ALARM }, |
| 283 | { "min_alarm", SENSORS_SUBFEATURE_FAN_MIN_ALARM }, |
| 284 | { "max_alarm", SENSORS_SUBFEATURE_FAN_MAX_ALARM }, |
| 285 | { "fault", SENSORS_SUBFEATURE_FAN_FAULT }, |
| 286 | { "beep", SENSORS_SUBFEATURE_FAN_BEEP }, |
| 287 | { NULL, 0 } |
| 288 | }; |
| 289 | |
| 290 | static const struct subfeature_type_match power_matches[] = { |
| 291 | { "average", SENSORS_SUBFEATURE_POWER_AVERAGE }, |
| 292 | { "average_highest", SENSORS_SUBFEATURE_POWER_AVERAGE_HIGHEST }, |
| 293 | { "average_lowest", SENSORS_SUBFEATURE_POWER_AVERAGE_LOWEST }, |
| 294 | { "input", SENSORS_SUBFEATURE_POWER_INPUT }, |
| 295 | { "input_highest", SENSORS_SUBFEATURE_POWER_INPUT_HIGHEST }, |
| 296 | { "input_lowest", SENSORS_SUBFEATURE_POWER_INPUT_LOWEST }, |
| 297 | { "cap", SENSORS_SUBFEATURE_POWER_CAP }, |
| 298 | { "cap_hyst", SENSORS_SUBFEATURE_POWER_CAP_HYST }, |
| 299 | { "cap_alarm", SENSORS_SUBFEATURE_POWER_CAP_ALARM }, |
| 300 | { "alarm", SENSORS_SUBFEATURE_POWER_ALARM }, |
| 301 | { "max", SENSORS_SUBFEATURE_POWER_MAX }, |
| 302 | { "max_alarm", SENSORS_SUBFEATURE_POWER_MAX_ALARM }, |
| 303 | { "crit", SENSORS_SUBFEATURE_POWER_CRIT }, |
| 304 | { "crit_alarm", SENSORS_SUBFEATURE_POWER_CRIT_ALARM }, |
| 305 | { "average_interval", SENSORS_SUBFEATURE_POWER_AVERAGE_INTERVAL }, |
| 306 | { NULL, 0 } |
| 307 | }; |
| 308 | |
| 309 | static const struct subfeature_type_match energy_matches[] = { |
| 310 | { "input", SENSORS_SUBFEATURE_ENERGY_INPUT }, |
| 311 | { NULL, 0 } |
| 312 | }; |
| 313 | |
| 314 | static const struct subfeature_type_match curr_matches[] = { |
| 315 | { "input", SENSORS_SUBFEATURE_CURR_INPUT }, |
| 316 | { "min", SENSORS_SUBFEATURE_CURR_MIN }, |
| 317 | { "max", SENSORS_SUBFEATURE_CURR_MAX }, |
| 318 | { "lcrit", SENSORS_SUBFEATURE_CURR_LCRIT }, |
| 319 | { "crit", SENSORS_SUBFEATURE_CURR_CRIT }, |
| 320 | { "average", SENSORS_SUBFEATURE_CURR_AVERAGE }, |
| 321 | { "lowest", SENSORS_SUBFEATURE_CURR_LOWEST }, |
| 322 | { "highest", SENSORS_SUBFEATURE_CURR_HIGHEST }, |
| 323 | { "alarm", SENSORS_SUBFEATURE_CURR_ALARM }, |
| 324 | { "min_alarm", SENSORS_SUBFEATURE_CURR_MIN_ALARM }, |
| 325 | { "max_alarm", SENSORS_SUBFEATURE_CURR_MAX_ALARM }, |
| 326 | { "lcrit_alarm", SENSORS_SUBFEATURE_CURR_LCRIT_ALARM }, |
| 327 | { "crit_alarm", SENSORS_SUBFEATURE_CURR_CRIT_ALARM }, |
| 328 | { "beep", SENSORS_SUBFEATURE_CURR_BEEP }, |
| 329 | { NULL, 0 } |
| 330 | }; |
| 331 | |
| 332 | static const struct subfeature_type_match humidity_matches[] = { |
| 333 | { "input", SENSORS_SUBFEATURE_HUMIDITY_INPUT }, |
| 334 | { NULL, 0 } |
| 335 | }; |
| 336 | |
| 337 | static const struct subfeature_type_match cpu_matches[] = { |
| 338 | { "vid", SENSORS_SUBFEATURE_VID }, |
| 339 | { NULL, 0 } |
| 340 | }; |
| 341 | |
| 342 | static const struct subfeature_type_match intrusion_matches[] = { |
| 343 | { "alarm", SENSORS_SUBFEATURE_INTRUSION_ALARM }, |
| 344 | { "beep", SENSORS_SUBFEATURE_INTRUSION_BEEP }, |
| 345 | { NULL, 0 } |
| 346 | }; |
| 347 | static struct feature_type_match matches[] = { |
| 348 | { "temp%d%c", temp_matches }, |
| 349 | { "in%d%c", in_matches }, |
| 350 | { "fan%d%c", fan_matches }, |
| 351 | { "cpu%d%c", cpu_matches }, |
| 352 | { "power%d%c", power_matches }, |
| 353 | { "curr%d%c", curr_matches }, |
| 354 | { "energy%d%c", energy_matches }, |
| 355 | { "intrusion%d%c", intrusion_matches }, |
| 356 | { "humidity%d%c", humidity_matches }, |
| 357 | }; |
| 358 | |
| 359 | /* Return the subfeature type and channel number based on the subfeature |
| 360 | name */ |
| 361 | static |
| 362 | sensors_subfeature_type sensors_subfeature_get_type(const char *name, int *nr) |
| 363 | { |
| 364 | char c; |
| 365 | int i, count; |
| 366 | const struct subfeature_type_match *submatches; |
| 367 | |
| 368 | /* Special case */ |
| 369 | if (!strcmp(name, "beep_enable")) { |
| 370 | *nr = 0; |
| 371 | return SENSORS_SUBFEATURE_BEEP_ENABLE; |
| 372 | } |
| 373 | |
| 374 | for (i = 0; i < ARRAY_SIZE(matches); i++) |
| 375 | if ((count = sscanf(name, matches[i].name, nr, &c))) |
| 376 | break; |
| 377 | |
| 378 | if (i == ARRAY_SIZE(matches) || count != 2 || c != '_') |
| 379 | return SENSORS_SUBFEATURE_UNKNOWN; /* no match */ |
| 380 | |
| 381 | submatches = matches[i].submatches; |
| 382 | name = strchr(name + 3, '_') + 1; |
| 383 | for (i = 0; submatches[i].name != NULL; i++) |
| 384 | if (!strcmp(name, submatches[i].name)) |
| 385 | return submatches[i].type; |
| 386 | |
| 387 | return SENSORS_SUBFEATURE_UNKNOWN; |
| 388 | } |
| 389 | |
| 390 | static int sensors_compute_max(void) |
| 391 | { |
| 392 | int i, j, max, offset; |
| 393 | const struct subfeature_type_match *submatches; |
| 394 | sensors_feature_type ftype; |
| 395 | |
| 396 | max = 0; |
| 397 | for (i = 0; i < ARRAY_SIZE(matches); i++) { |
| 398 | submatches = matches[i].submatches; |
| 399 | for (j = 0; submatches[j].name != NULL; j++) { |
| 400 | ftype = submatches[j].type >> 8; |
| 401 | |
| 402 | if (ftype < SENSORS_FEATURE_VID) { |
| 403 | offset = submatches[j].type & 0x7F; |
| 404 | if (offset >= max) |
| 405 | max = offset + 1; |
| 406 | } else { |
| 407 | offset = submatches[j].type & 0xFF; |
| 408 | if (offset >= max * 2) |
| 409 | max = ((offset + 1) + 1) / 2; |
| 410 | } |
| 411 | } |
| 412 | } |
| 413 | |
| 414 | return max; |
| 415 | } |
| 416 | |
| 417 | static int sensors_get_attr_mode(const char *device, const char *attr) |
| 418 | { |
| 419 | char path[NAME_MAX]; |
| 420 | struct stat st; |
| 421 | int mode = 0; |
| 422 | |
| 423 | snprintf(path, NAME_MAX, "%s/%s", device, attr); |
| 424 | if (!stat(path, &st)) { |
| 425 | if (st.st_mode & S_IRUSR) |
| 426 | mode |= SENSORS_MODE_R; |
| 427 | if (st.st_mode & S_IWUSR) |
| 428 | mode |= SENSORS_MODE_W; |
| 429 | } |
| 430 | return mode; |
| 431 | } |
| 432 | |
| 433 | static int sensors_read_dynamic_chip(sensors_chip_features *chip, |
| 434 | const char *dev_path) |
| 435 | { |
| 436 | int i, fnum = 0, sfnum = 0, prev_slot; |
| 437 | static int max_subfeatures; |
| 438 | DIR *dir; |
| 439 | struct dirent *ent; |
| 440 | sensors_subfeature *all_subfeatures; |
| 441 | sensors_subfeature *dyn_subfeatures; |
| 442 | sensors_feature *dyn_features; |
| 443 | sensors_feature_type ftype; |
| 444 | sensors_subfeature_type sftype; |
| 445 | |
| 446 | if (!(dir = opendir(dev_path))) |
| 447 | return -errno; |
| 448 | |
| 449 | /* Dynamically figure out the max number of subfeatures */ |
| 450 | if (!max_subfeatures) |
| 451 | max_subfeatures = sensors_compute_max(); |
| 452 | |
| 453 | /* We use a large sparse table at first to store all found |
| 454 | subfeatures, so that we can store them sorted at type and index |
| 455 | and then later create a dense sorted table. */ |
| 456 | all_subfeatures = calloc(ALL_POSSIBLE_SUBFEATURES, |
| 457 | sizeof(sensors_subfeature)); |
| 458 | if (!all_subfeatures) |
| 459 | sensors_fatal_error(__func__, "Out of memory"); |
| 460 | |
| 461 | while ((ent = readdir(dir))) { |
| 462 | char *name; |
| 463 | int nr; |
| 464 | |
| 465 | /* Skip directories and symlinks */ |
| 466 | if (ent->d_type != DT_REG) |
| 467 | continue; |
| 468 | |
| 469 | name = ent->d_name; |
| 470 | |
| 471 | sftype = sensors_subfeature_get_type(name, &nr); |
| 472 | if (sftype == SENSORS_SUBFEATURE_UNKNOWN) |
| 473 | continue; |
| 474 | ftype = sftype >> 8; |
| 475 | |
| 476 | /* Adjust the channel number */ |
| 477 | switch (ftype) { |
| 478 | case SENSORS_FEATURE_FAN: |
| 479 | case SENSORS_FEATURE_TEMP: |
| 480 | case SENSORS_FEATURE_POWER: |
| 481 | case SENSORS_FEATURE_ENERGY: |
| 482 | case SENSORS_FEATURE_CURR: |
| 483 | case SENSORS_FEATURE_HUMIDITY: |
| 484 | nr--; |
| 485 | break; |
| 486 | default: |
| 487 | break; |
| 488 | } |
| 489 | |
| 490 | if (nr < 0 || nr >= MAX_SENSORS_PER_TYPE) { |
| 491 | /* More sensors of one type than MAX_SENSORS_PER_TYPE, |
| 492 | we have to ignore it */ |
| 493 | #ifdef DEBUG |
| 494 | sensors_fatal_error(__func__, |
| 495 | "Increase MAX_SENSORS_PER_TYPE!"); |
| 496 | #endif |
| 497 | continue; |
| 498 | } |
| 499 | |
| 500 | /* "calculate" a place to store the subfeature in our sparse, |
| 501 | sorted table */ |
| 502 | switch (ftype) { |
| 503 | case SENSORS_FEATURE_VID: |
| 504 | case SENSORS_FEATURE_INTRUSION: |
| 505 | i = SUB_OFFSET_OTHER + |
| 506 | (ftype - SENSORS_FEATURE_VID) * FEATURE_TYPE_SIZE + |
| 507 | nr * FEATURE_SIZE + (sftype & 0xFF); |
| 508 | break; |
| 509 | case SENSORS_FEATURE_BEEP_ENABLE: |
| 510 | i = SUB_OFFSET_MISC + |
| 511 | (ftype - SENSORS_FEATURE_BEEP_ENABLE); |
| 512 | break; |
| 513 | default: |
| 514 | i = ftype * FEATURE_TYPE_SIZE + |
| 515 | nr * FEATURE_SIZE + |
| 516 | ((sftype & 0x80) >> 7) * max_subfeatures + |
| 517 | (sftype & 0x7F); |
| 518 | } |
| 519 | |
| 520 | if (all_subfeatures[i].name) { |
| 521 | #ifdef DEBUG |
| 522 | sensors_fatal_error(__func__, "Duplicate subfeature"); |
| 523 | #endif |
| 524 | continue; |
| 525 | } |
| 526 | |
| 527 | /* fill in the subfeature members */ |
| 528 | all_subfeatures[i].type = sftype; |
| 529 | all_subfeatures[i].name = strdup(name); |
| 530 | if (!all_subfeatures[i].name) |
| 531 | sensors_fatal_error(__func__, "Out of memory"); |
| 532 | |
| 533 | /* Other and misc subfeatures are never scaled */ |
| 534 | if (sftype < SENSORS_SUBFEATURE_VID && !(sftype & 0x80)) |
| 535 | all_subfeatures[i].flags |= SENSORS_COMPUTE_MAPPING; |
| 536 | all_subfeatures[i].flags |= sensors_get_attr_mode(dev_path, name); |
| 537 | |
| 538 | sfnum++; |
| 539 | } |
| 540 | closedir(dir); |
| 541 | |
| 542 | if (!sfnum) { /* No subfeature */ |
| 543 | chip->subfeature = NULL; |
| 544 | goto exit_free; |
| 545 | } |
| 546 | |
| 547 | /* How many main features? */ |
| 548 | prev_slot = -1; |
| 549 | for (i = 0; i < ALL_POSSIBLE_SUBFEATURES; i++) { |
| 550 | if (!all_subfeatures[i].name) |
| 551 | continue; |
| 552 | |
| 553 | if (i >= SUB_OFFSET_MISC || i / FEATURE_SIZE != prev_slot) { |
| 554 | fnum++; |
| 555 | prev_slot = i / FEATURE_SIZE; |
| 556 | } |
| 557 | } |
| 558 | |
| 559 | dyn_subfeatures = calloc(sfnum, sizeof(sensors_subfeature)); |
| 560 | dyn_features = calloc(fnum, sizeof(sensors_feature)); |
| 561 | if (!dyn_subfeatures || !dyn_features) |
| 562 | sensors_fatal_error(__func__, "Out of memory"); |
| 563 | |
| 564 | /* Copy from the sparse array to the compact array */ |
| 565 | sfnum = 0; |
| 566 | fnum = -1; |
| 567 | prev_slot = -1; |
| 568 | for (i = 0; i < ALL_POSSIBLE_SUBFEATURES; i++) { |
| 569 | if (!all_subfeatures[i].name) |
| 570 | continue; |
| 571 | |
| 572 | /* New main feature? */ |
| 573 | if (i >= SUB_OFFSET_MISC || i / FEATURE_SIZE != prev_slot) { |
| 574 | ftype = all_subfeatures[i].type >> 8; |
| 575 | fnum++; |
| 576 | prev_slot = i / FEATURE_SIZE; |
| 577 | |
| 578 | dyn_features[fnum].name = get_feature_name(ftype, |
| 579 | all_subfeatures[i].name); |
| 580 | dyn_features[fnum].number = fnum; |
| 581 | dyn_features[fnum].first_subfeature = sfnum; |
| 582 | dyn_features[fnum].type = ftype; |
| 583 | } |
| 584 | |
| 585 | dyn_subfeatures[sfnum] = all_subfeatures[i]; |
| 586 | dyn_subfeatures[sfnum].number = sfnum; |
| 587 | /* Back to the feature */ |
| 588 | dyn_subfeatures[sfnum].mapping = fnum; |
| 589 | |
| 590 | sfnum++; |
| 591 | } |
| 592 | |
| 593 | chip->subfeature = dyn_subfeatures; |
| 594 | chip->subfeature_count = sfnum; |
| 595 | chip->feature = dyn_features; |
| 596 | chip->feature_count = ++fnum; |
| 597 | |
| 598 | exit_free: |
| 599 | free(all_subfeatures); |
| 600 | return 0; |
| 601 | } |
| 602 | |
| 603 | /* returns !0 if sysfs filesystem was found, 0 otherwise */ |
| 604 | int sensors_init_sysfs(void) |
| 605 | { |
| 606 | struct statfs statfsbuf; |
| 607 | |
| 608 | snprintf(sensors_sysfs_mount, NAME_MAX, "%s", "/sys"); |
| 609 | if (statfs(sensors_sysfs_mount, &statfsbuf) < 0 |
| 610 | || statfsbuf.f_type != SYSFS_MAGIC) |
| 611 | return 0; |
| 612 | |
| 613 | return 1; |
| 614 | } |
| 615 | |
| 616 | /* returns: number of devices added (0 or 1) if successful, <0 otherwise */ |
| 617 | static int sensors_read_one_sysfs_chip(const char *dev_path, |
| 618 | const char *dev_name, |
| 619 | const char *hwmon_path) |
| 620 | { |
| 621 | int domain, bus, slot, fn, vendor, product, id; |
| 622 | int err = -SENSORS_ERR_KERNEL; |
| 623 | char *bus_attr; |
| 624 | char bus_path[NAME_MAX]; |
| 625 | char linkpath[NAME_MAX]; |
| 626 | char subsys_path[NAME_MAX], *subsys; |
| 627 | int sub_len; |
| 628 | sensors_chip_features entry; |
| 629 | |
| 630 | /* ignore any device without name attribute */ |
| 631 | if (!(entry.chip.prefix = sysfs_read_attr(hwmon_path, "name"))) |
| 632 | return 0; |
| 633 | |
| 634 | entry.chip.path = strdup(hwmon_path); |
| 635 | if (!entry.chip.path) |
| 636 | sensors_fatal_error(__func__, "Out of memory"); |
| 637 | |
| 638 | if (dev_path == NULL) { |
| 639 | /* Virtual device */ |
| 640 | entry.chip.bus.type = SENSORS_BUS_TYPE_VIRTUAL; |
| 641 | entry.chip.bus.nr = 0; |
| 642 | /* For now we assume that virtual devices are unique */ |
| 643 | entry.chip.addr = 0; |
| 644 | goto done; |
| 645 | } |
| 646 | |
| 647 | /* Find bus type */ |
| 648 | snprintf(linkpath, NAME_MAX, "%s/subsystem", dev_path); |
| 649 | sub_len = readlink(linkpath, subsys_path, NAME_MAX - 1); |
| 650 | if (sub_len < 0 && errno == ENOENT) { |
| 651 | /* Fallback to "bus" link for kernels <= 2.6.17 */ |
| 652 | snprintf(linkpath, NAME_MAX, "%s/bus", dev_path); |
| 653 | sub_len = readlink(linkpath, subsys_path, NAME_MAX - 1); |
| 654 | } |
| 655 | if (sub_len < 0) { |
| 656 | /* Older kernels (<= 2.6.11) have neither the subsystem |
| 657 | symlink nor the bus symlink */ |
| 658 | if (errno == ENOENT) |
| 659 | subsys = NULL; |
| 660 | else |
| 661 | goto exit_free; |
| 662 | } else { |
| 663 | subsys_path[sub_len] = '\0'; |
| 664 | subsys = strrchr(subsys_path, '/') + 1; |
| 665 | } |
| 666 | |
| 667 | if ((!subsys || !strcmp(subsys, "i2c")) && |
| 668 | sscanf(dev_name, "%hd-%x", &entry.chip.bus.nr, |
| 669 | &entry.chip.addr) == 2) { |
| 670 | /* find out if legacy ISA or not */ |
| 671 | if (entry.chip.bus.nr == 9191) { |
| 672 | entry.chip.bus.type = SENSORS_BUS_TYPE_ISA; |
| 673 | entry.chip.bus.nr = 0; |
| 674 | } else { |
| 675 | entry.chip.bus.type = SENSORS_BUS_TYPE_I2C; |
| 676 | snprintf(bus_path, sizeof(bus_path), |
| 677 | "%s/class/i2c-adapter/i2c-%d/device", |
| 678 | sensors_sysfs_mount, entry.chip.bus.nr); |
| 679 | |
| 680 | if ((bus_attr = sysfs_read_attr(bus_path, "name"))) { |
| 681 | if (!strncmp(bus_attr, "ISA ", 4)) { |
| 682 | entry.chip.bus.type = SENSORS_BUS_TYPE_ISA; |
| 683 | entry.chip.bus.nr = 0; |
| 684 | } |
| 685 | |
| 686 | free(bus_attr); |
| 687 | } |
| 688 | } |
| 689 | } else |
| 690 | if ((!subsys || !strcmp(subsys, "spi")) && |
| 691 | sscanf(dev_name, "spi%hd.%d", &entry.chip.bus.nr, |
| 692 | &entry.chip.addr) == 2) { |
| 693 | /* SPI */ |
| 694 | entry.chip.bus.type = SENSORS_BUS_TYPE_SPI; |
| 695 | } else |
| 696 | if ((!subsys || !strcmp(subsys, "pci")) && |
| 697 | sscanf(dev_name, "%x:%x:%x.%x", &domain, &bus, &slot, &fn) == 4) { |
| 698 | /* PCI */ |
| 699 | entry.chip.addr = (domain << 16) + (bus << 8) + (slot << 3) + fn; |
| 700 | entry.chip.bus.type = SENSORS_BUS_TYPE_PCI; |
| 701 | entry.chip.bus.nr = 0; |
| 702 | } else |
| 703 | if ((!subsys || !strcmp(subsys, "platform") || |
| 704 | !strcmp(subsys, "of_platform"))) { |
| 705 | /* must be new ISA (platform driver) */ |
| 706 | if (sscanf(dev_name, "%*[a-z0-9_].%d", &entry.chip.addr) != 1) |
| 707 | entry.chip.addr = 0; |
| 708 | entry.chip.bus.type = SENSORS_BUS_TYPE_ISA; |
| 709 | entry.chip.bus.nr = 0; |
| 710 | } else if (subsys && !strcmp(subsys, "acpi")) { |
| 711 | entry.chip.bus.type = SENSORS_BUS_TYPE_ACPI; |
| 712 | /* For now we assume that acpi devices are unique */ |
| 713 | entry.chip.bus.nr = 0; |
| 714 | entry.chip.addr = 0; |
| 715 | } else |
| 716 | if (subsys && !strcmp(subsys, "hid") && |
| 717 | sscanf(dev_name, "%x:%x:%x.%x", &bus, &vendor, &product, &id) == 4) { |
| 718 | entry.chip.bus.type = SENSORS_BUS_TYPE_HID; |
| 719 | /* As of kernel 2.6.32, the hid device names don't look good */ |
| 720 | entry.chip.bus.nr = bus; |
| 721 | entry.chip.addr = id; |
| 722 | } else { |
| 723 | /* Ignore unknown device */ |
| 724 | err = 0; |
| 725 | goto exit_free; |
| 726 | } |
| 727 | |
| 728 | done: |
| 729 | if (sensors_read_dynamic_chip(&entry, hwmon_path) < 0) |
| 730 | goto exit_free; |
| 731 | if (!entry.subfeature) { /* No subfeature, discard chip */ |
| 732 | err = 0; |
| 733 | goto exit_free; |
| 734 | } |
| 735 | sensors_add_proc_chips(&entry); |
| 736 | |
| 737 | return 1; |
| 738 | |
| 739 | exit_free: |
| 740 | free(entry.chip.prefix); |
| 741 | free(entry.chip.path); |
| 742 | return err; |
| 743 | } |
| 744 | |
| 745 | static int sensors_add_hwmon_device_compat(const char *path, |
| 746 | const char *dev_name) |
| 747 | { |
| 748 | int err; |
| 749 | |
| 750 | err = sensors_read_one_sysfs_chip(path, dev_name, path); |
| 751 | if (err < 0) |
| 752 | return err; |
| 753 | return 0; |
| 754 | } |
| 755 | |
| 756 | /* returns 0 if successful, !0 otherwise */ |
| 757 | static int sensors_read_sysfs_chips_compat(void) |
| 758 | { |
| 759 | int ret; |
| 760 | |
| 761 | ret = sysfs_foreach_busdev("i2c", sensors_add_hwmon_device_compat); |
| 762 | if (ret && ret != ENOENT) |
| 763 | return -SENSORS_ERR_KERNEL; |
| 764 | |
| 765 | return 0; |
| 766 | } |
| 767 | |
| 768 | static int sensors_add_hwmon_device(const char *path, const char *classdev) |
| 769 | { |
| 770 | char linkpath[NAME_MAX]; |
| 771 | char device[NAME_MAX], *device_p; |
| 772 | int dev_len, err; |
| 773 | (void)classdev; /* hide warning */ |
| 774 | |
| 775 | snprintf(linkpath, NAME_MAX, "%s/device", path); |
| 776 | dev_len = readlink(linkpath, device, NAME_MAX - 1); |
| 777 | if (dev_len < 0) { |
| 778 | /* No device link? Treat as virtual */ |
| 779 | err = sensors_read_one_sysfs_chip(NULL, NULL, path); |
| 780 | } else { |
| 781 | device[dev_len] = '\0'; |
| 782 | device_p = strrchr(device, '/') + 1; |
| 783 | |
| 784 | /* The attributes we want might be those of the hwmon class |
| 785 | device, or those of the device itself. */ |
| 786 | err = sensors_read_one_sysfs_chip(linkpath, device_p, path); |
| 787 | if (err == 0) |
| 788 | err = sensors_read_one_sysfs_chip(linkpath, device_p, |
| 789 | linkpath); |
| 790 | } |
| 791 | if (err < 0) |
| 792 | return err; |
| 793 | return 0; |
| 794 | } |
| 795 | |
| 796 | /* returns 0 if successful, !0 otherwise */ |
| 797 | int sensors_read_sysfs_chips(void) |
| 798 | { |
| 799 | int ret; |
| 800 | |
| 801 | ret = sysfs_foreach_classdev("hwmon", sensors_add_hwmon_device); |
| 802 | if (ret == ENOENT) { |
| 803 | /* compatibility function for kernel 2.6.n where n <= 13 */ |
| 804 | return sensors_read_sysfs_chips_compat(); |
| 805 | } |
| 806 | |
| 807 | if (ret > 0) |
| 808 | ret = -SENSORS_ERR_KERNEL; |
| 809 | return ret; |
| 810 | } |
| 811 | |
| 812 | /* returns 0 if successful, !0 otherwise */ |
| 813 | static int sensors_add_i2c_bus(const char *path, const char *classdev) |
| 814 | { |
| 815 | sensors_bus entry; |
| 816 | |
| 817 | if (sscanf(classdev, "i2c-%hd", &entry.bus.nr) != 1 || |
| 818 | entry.bus.nr == 9191) /* legacy ISA */ |
| 819 | return 0; |
| 820 | entry.bus.type = SENSORS_BUS_TYPE_I2C; |
| 821 | |
| 822 | /* Get the adapter name from the classdev "name" attribute |
| 823 | * (Linux 2.6.20 and later). If it fails, fall back to |
| 824 | * the device "name" attribute (for older kernels). */ |
| 825 | entry.adapter = sysfs_read_attr(path, "name"); |
| 826 | if (!entry.adapter) |
| 827 | entry.adapter = sysfs_read_attr(path, "device/name"); |
| 828 | if (entry.adapter) |
| 829 | sensors_add_proc_bus(&entry); |
| 830 | |
| 831 | return 0; |
| 832 | } |
| 833 | |
| 834 | /* returns 0 if successful, !0 otherwise */ |
| 835 | int sensors_read_sysfs_bus(void) |
| 836 | { |
| 837 | int ret; |
| 838 | |
| 839 | ret = sysfs_foreach_classdev("i2c-adapter", sensors_add_i2c_bus); |
| 840 | if (ret == ENOENT) |
| 841 | ret = sysfs_foreach_busdev("i2c", sensors_add_i2c_bus); |
| 842 | if (ret && ret != ENOENT) |
| 843 | return -SENSORS_ERR_KERNEL; |
| 844 | |
| 845 | return 0; |
| 846 | } |
| 847 | |
| 848 | int sensors_read_sysfs_attr(const sensors_chip_name *name, |
| 849 | const sensors_subfeature *subfeature, |
| 850 | double *value) |
| 851 | { |
| 852 | char n[NAME_MAX]; |
| 853 | int f; |
| 854 | |
| 855 | snprintf(n, NAME_MAX, "%s/%s", name->path, subfeature->name); |
| 856 | if ((f = open(n, O_RDONLY)) != -1) { |
| 857 | int res, err = 0; |
| 858 | char buf[512]; |
| 859 | int count; |
| 860 | |
| 861 | errno = 0; |
| 862 | if ((count = read(f, buf, sizeof(buf) - 1)) == -1) { |
| 863 | if (errno == EIO) |
| 864 | err = -SENSORS_ERR_IO; |
| 865 | else |
| 866 | err = -SENSORS_ERR_ACCESS_R; |
| 867 | } else { |
| 868 | buf[count] = '\0'; |
| 869 | errno = 0; |
| 870 | res = sscanf(buf, "%lf", value); |
| 871 | if (res == EOF && errno == EIO) |
| 872 | err = -SENSORS_ERR_IO; |
| 873 | else if (res != 1) |
| 874 | err = -SENSORS_ERR_ACCESS_R; |
| 875 | } |
| 876 | res = close(f); |
| 877 | if (err) |
| 878 | return err; |
| 879 | |
| 880 | if (res != 0) { |
| 881 | if (errno == EIO) |
| 882 | return -SENSORS_ERR_IO; |
| 883 | else |
| 884 | return -SENSORS_ERR_ACCESS_R; |
| 885 | } |
| 886 | if (!sensors_sysfs_no_scaling) |
| 887 | *value /= get_type_scaling(subfeature->type); |
| 888 | } else |
| 889 | return -SENSORS_ERR_KERNEL; |
| 890 | |
| 891 | return 0; |
| 892 | } |
| 893 | |
| 894 | int sensors_write_sysfs_attr(const sensors_chip_name *name, |
| 895 | const sensors_subfeature *subfeature, |
| 896 | double value) |
| 897 | { |
| 898 | char n[NAME_MAX]; |
| 899 | FILE *f; |
| 900 | |
| 901 | snprintf(n, NAME_MAX, "%s/%s", name->path, subfeature->name); |
| 902 | if ((f = fopen(n, "w"))) { |
| 903 | int res, err = 0; |
| 904 | |
| 905 | if (!sensors_sysfs_no_scaling) |
| 906 | value *= get_type_scaling(subfeature->type); |
| 907 | res = fprintf(f, "%d", (int) value); |
| 908 | if (res == -EIO) |
| 909 | err = -SENSORS_ERR_IO; |
| 910 | else if (res < 0) |
| 911 | err = -SENSORS_ERR_ACCESS_W; |
| 912 | res = fclose(f); |
| 913 | if (err) |
| 914 | return err; |
| 915 | |
| 916 | if (res == EOF) { |
| 917 | if (errno == EIO) |
| 918 | return -SENSORS_ERR_IO; |
| 919 | else |
| 920 | return -SENSORS_ERR_ACCESS_W; |
| 921 | } |
| 922 | } else |
| 923 | return -SENSORS_ERR_KERNEL; |
| 924 | |
| 925 | return 0; |
| 926 | } |