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-rw-r--r--daemon/libsensors/sysfs.c926
1 files changed, 926 insertions, 0 deletions
diff --git a/daemon/libsensors/sysfs.c b/daemon/libsensors/sysfs.c
new file mode 100644
index 0000000..2b494c9
--- /dev/null
+++ b/daemon/libsensors/sysfs.c
@@ -0,0 +1,926 @@
+/*
+ sysfs.c - Part of libsensors, a library for reading Linux sensor data
+ Copyright (c) 2005 Mark M. Hoffman <mhoffman@lightlink.com>
+ Copyright (C) 2007-2010 Jean Delvare <khali@linux-fr.org>
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU Lesser General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ MA 02110-1301 USA.
+*/
+
+/*** 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. ***/
+
+/* this define needed for strndup() */
+#define _GNU_SOURCE
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/vfs.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <errno.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include "data.h"
+#include "error.h"
+#include "access.h"
+#include "general.h"
+#include "sysfs.h"
+
+
+/****************************************************************************/
+
+#define ATTR_MAX 128
+#define SYSFS_MAGIC 0x62656572
+
+int sensors_sysfs_no_scaling;
+
+/*
+ * Read an attribute from sysfs
+ * Returns a pointer to a freshly allocated string; free it yourself.
+ * If the file doesn't exist or can't be read, NULL is returned.
+ */
+static char *sysfs_read_attr(const char *device, const char *attr)
+{
+ char path[NAME_MAX];
+ char buf[ATTR_MAX], *p;
+ FILE *f;
+
+ snprintf(path, NAME_MAX, "%s/%s", device, attr);
+
+ if (!(f = fopen(path, "r")))
+ return NULL;
+ p = fgets(buf, ATTR_MAX, f);
+ fclose(f);
+ if (!p)
+ return NULL;
+
+ /* Last byte is a '\n'; chop that off */
+ p = strndup(buf, strlen(buf) - 1);
+ if (!p)
+ sensors_fatal_error(__func__, "Out of memory");
+ return p;
+}
+
+/*
+ * Call an arbitrary function for each class device of the given class
+ * Returns 0 on success (all calls returned 0), a positive errno for
+ * local errors, or a negative error value if any call fails.
+ */
+static int sysfs_foreach_classdev(const char *class_name,
+ int (*func)(const char *, const char *))
+{
+ char path[NAME_MAX];
+ int path_off, ret;
+ DIR *dir;
+ struct dirent *ent;
+
+ path_off = snprintf(path, NAME_MAX, "%s/class/%s",
+ sensors_sysfs_mount, class_name);
+ if (!(dir = opendir(path)))
+ return errno;
+
+ ret = 0;
+ while (!ret && (ent = readdir(dir))) {
+ if (ent->d_name[0] == '.') /* skip hidden entries */
+ continue;
+
+ snprintf(path + path_off, NAME_MAX - path_off, "/%s",
+ ent->d_name);
+ ret = func(path, ent->d_name);
+ }
+
+ closedir(dir);
+ return ret;
+}
+
+/*
+ * Call an arbitrary function for each device of the given bus type
+ * Returns 0 on success (all calls returned 0), a positive errno for
+ * local errors, or a negative error value if any call fails.
+ */
+static int sysfs_foreach_busdev(const char *bus_type,
+ int (*func)(const char *, const char *))
+{
+ char path[NAME_MAX];
+ int path_off, ret;
+ DIR *dir;
+ struct dirent *ent;
+
+ path_off = snprintf(path, NAME_MAX, "%s/bus/%s/devices",
+ sensors_sysfs_mount, bus_type);
+ if (!(dir = opendir(path)))
+ return errno;
+
+ ret = 0;
+ while (!ret && (ent = readdir(dir))) {
+ if (ent->d_name[0] == '.') /* skip hidden entries */
+ continue;
+
+ snprintf(path + path_off, NAME_MAX - path_off, "/%s",
+ ent->d_name);
+ ret = func(path, ent->d_name);
+ }
+
+ closedir(dir);
+ return ret;
+}
+
+/****************************************************************************/
+
+char sensors_sysfs_mount[NAME_MAX];
+
+#define MAX_MAIN_SENSOR_TYPES (SENSORS_FEATURE_MAX_MAIN - SENSORS_FEATURE_IN)
+#define MAX_OTHER_SENSOR_TYPES (SENSORS_FEATURE_MAX_OTHER - SENSORS_FEATURE_VID)
+#define MAX_SENSORS_PER_TYPE 24
+/* max_subfeatures is now computed dynamically */
+#define FEATURE_SIZE (max_subfeatures * 2)
+#define FEATURE_TYPE_SIZE (MAX_SENSORS_PER_TYPE * FEATURE_SIZE)
+
+/*
+ * Room for all 7 main types (in, fan, temp, power, energy, current, humidity)
+ * and 2 other types (VID, intrusion) with all their subfeatures + misc features
+ */
+#define SUB_OFFSET_OTHER (MAX_MAIN_SENSOR_TYPES * FEATURE_TYPE_SIZE)
+#define SUB_OFFSET_MISC (SUB_OFFSET_OTHER + \
+ MAX_OTHER_SENSOR_TYPES * FEATURE_TYPE_SIZE)
+#define ALL_POSSIBLE_SUBFEATURES (SUB_OFFSET_MISC + 1)
+
+static
+int get_type_scaling(sensors_subfeature_type type)
+{
+ /* Multipliers for subfeatures */
+ switch (type & 0xFF80) {
+ case SENSORS_SUBFEATURE_IN_INPUT:
+ case SENSORS_SUBFEATURE_TEMP_INPUT:
+ case SENSORS_SUBFEATURE_CURR_INPUT:
+ case SENSORS_SUBFEATURE_HUMIDITY_INPUT:
+ return 1000;
+ case SENSORS_SUBFEATURE_FAN_INPUT:
+ return 1;
+ case SENSORS_SUBFEATURE_POWER_AVERAGE:
+ case SENSORS_SUBFEATURE_ENERGY_INPUT:
+ return 1000000;
+ }
+
+ /* Multipliers for second class subfeatures
+ that need their own multiplier */
+ switch (type) {
+ case SENSORS_SUBFEATURE_POWER_AVERAGE_INTERVAL:
+ case SENSORS_SUBFEATURE_VID:
+ case SENSORS_SUBFEATURE_TEMP_OFFSET:
+ return 1000;
+ default:
+ return 1;
+ }
+}
+
+static
+char *get_feature_name(sensors_feature_type ftype, char *sfname)
+{
+ char *name, *underscore;
+
+ switch (ftype) {
+ case SENSORS_FEATURE_IN:
+ case SENSORS_FEATURE_FAN:
+ case SENSORS_FEATURE_TEMP:
+ case SENSORS_FEATURE_POWER:
+ case SENSORS_FEATURE_ENERGY:
+ case SENSORS_FEATURE_CURR:
+ case SENSORS_FEATURE_HUMIDITY:
+ case SENSORS_FEATURE_INTRUSION:
+ underscore = strchr(sfname, '_');
+ name = strndup(sfname, underscore - sfname);
+ if (!name)
+ sensors_fatal_error(__func__, "Out of memory");
+
+ break;
+ default:
+ name = strdup(sfname);
+ if (!name)
+ sensors_fatal_error(__func__, "Out of memory");
+ }
+
+ return name;
+}
+
+/* Static mappings for use by sensors_subfeature_get_type() */
+struct subfeature_type_match
+{
+ const char *name;
+ sensors_subfeature_type type;
+};
+
+struct feature_type_match
+{
+ const char *name;
+ const struct subfeature_type_match *submatches;
+};
+
+static const struct subfeature_type_match temp_matches[] = {
+ { "input", SENSORS_SUBFEATURE_TEMP_INPUT },
+ { "max", SENSORS_SUBFEATURE_TEMP_MAX },
+ { "max_hyst", SENSORS_SUBFEATURE_TEMP_MAX_HYST },
+ { "min", SENSORS_SUBFEATURE_TEMP_MIN },
+ { "crit", SENSORS_SUBFEATURE_TEMP_CRIT },
+ { "crit_hyst", SENSORS_SUBFEATURE_TEMP_CRIT_HYST },
+ { "lcrit", SENSORS_SUBFEATURE_TEMP_LCRIT },
+ { "emergency", SENSORS_SUBFEATURE_TEMP_EMERGENCY },
+ { "emergency_hyst", SENSORS_SUBFEATURE_TEMP_EMERGENCY_HYST },
+ { "lowest", SENSORS_SUBFEATURE_TEMP_LOWEST },
+ { "highest", SENSORS_SUBFEATURE_TEMP_HIGHEST },
+ { "alarm", SENSORS_SUBFEATURE_TEMP_ALARM },
+ { "min_alarm", SENSORS_SUBFEATURE_TEMP_MIN_ALARM },
+ { "max_alarm", SENSORS_SUBFEATURE_TEMP_MAX_ALARM },
+ { "crit_alarm", SENSORS_SUBFEATURE_TEMP_CRIT_ALARM },
+ { "emergency_alarm", SENSORS_SUBFEATURE_TEMP_EMERGENCY_ALARM },
+ { "lcrit_alarm", SENSORS_SUBFEATURE_TEMP_LCRIT_ALARM },
+ { "fault", SENSORS_SUBFEATURE_TEMP_FAULT },
+ { "type", SENSORS_SUBFEATURE_TEMP_TYPE },
+ { "offset", SENSORS_SUBFEATURE_TEMP_OFFSET },
+ { "beep", SENSORS_SUBFEATURE_TEMP_BEEP },
+ { NULL, 0 }
+};
+
+static const struct subfeature_type_match in_matches[] = {
+ { "input", SENSORS_SUBFEATURE_IN_INPUT },
+ { "min", SENSORS_SUBFEATURE_IN_MIN },
+ { "max", SENSORS_SUBFEATURE_IN_MAX },
+ { "lcrit", SENSORS_SUBFEATURE_IN_LCRIT },
+ { "crit", SENSORS_SUBFEATURE_IN_CRIT },
+ { "average", SENSORS_SUBFEATURE_IN_AVERAGE },
+ { "lowest", SENSORS_SUBFEATURE_IN_LOWEST },
+ { "highest", SENSORS_SUBFEATURE_IN_HIGHEST },
+ { "alarm", SENSORS_SUBFEATURE_IN_ALARM },
+ { "min_alarm", SENSORS_SUBFEATURE_IN_MIN_ALARM },
+ { "max_alarm", SENSORS_SUBFEATURE_IN_MAX_ALARM },
+ { "lcrit_alarm", SENSORS_SUBFEATURE_IN_LCRIT_ALARM },
+ { "crit_alarm", SENSORS_SUBFEATURE_IN_CRIT_ALARM },
+ { "beep", SENSORS_SUBFEATURE_IN_BEEP },
+ { NULL, 0 }
+};
+
+static const struct subfeature_type_match fan_matches[] = {
+ { "input", SENSORS_SUBFEATURE_FAN_INPUT },
+ { "min", SENSORS_SUBFEATURE_FAN_MIN },
+ { "max", SENSORS_SUBFEATURE_FAN_MAX },
+ { "div", SENSORS_SUBFEATURE_FAN_DIV },
+ { "pulses", SENSORS_SUBFEATURE_FAN_PULSES },
+ { "alarm", SENSORS_SUBFEATURE_FAN_ALARM },
+ { "min_alarm", SENSORS_SUBFEATURE_FAN_MIN_ALARM },
+ { "max_alarm", SENSORS_SUBFEATURE_FAN_MAX_ALARM },
+ { "fault", SENSORS_SUBFEATURE_FAN_FAULT },
+ { "beep", SENSORS_SUBFEATURE_FAN_BEEP },
+ { NULL, 0 }
+};
+
+static const struct subfeature_type_match power_matches[] = {
+ { "average", SENSORS_SUBFEATURE_POWER_AVERAGE },
+ { "average_highest", SENSORS_SUBFEATURE_POWER_AVERAGE_HIGHEST },
+ { "average_lowest", SENSORS_SUBFEATURE_POWER_AVERAGE_LOWEST },
+ { "input", SENSORS_SUBFEATURE_POWER_INPUT },
+ { "input_highest", SENSORS_SUBFEATURE_POWER_INPUT_HIGHEST },
+ { "input_lowest", SENSORS_SUBFEATURE_POWER_INPUT_LOWEST },
+ { "cap", SENSORS_SUBFEATURE_POWER_CAP },
+ { "cap_hyst", SENSORS_SUBFEATURE_POWER_CAP_HYST },
+ { "cap_alarm", SENSORS_SUBFEATURE_POWER_CAP_ALARM },
+ { "alarm", SENSORS_SUBFEATURE_POWER_ALARM },
+ { "max", SENSORS_SUBFEATURE_POWER_MAX },
+ { "max_alarm", SENSORS_SUBFEATURE_POWER_MAX_ALARM },
+ { "crit", SENSORS_SUBFEATURE_POWER_CRIT },
+ { "crit_alarm", SENSORS_SUBFEATURE_POWER_CRIT_ALARM },
+ { "average_interval", SENSORS_SUBFEATURE_POWER_AVERAGE_INTERVAL },
+ { NULL, 0 }
+};
+
+static const struct subfeature_type_match energy_matches[] = {
+ { "input", SENSORS_SUBFEATURE_ENERGY_INPUT },
+ { NULL, 0 }
+};
+
+static const struct subfeature_type_match curr_matches[] = {
+ { "input", SENSORS_SUBFEATURE_CURR_INPUT },
+ { "min", SENSORS_SUBFEATURE_CURR_MIN },
+ { "max", SENSORS_SUBFEATURE_CURR_MAX },
+ { "lcrit", SENSORS_SUBFEATURE_CURR_LCRIT },
+ { "crit", SENSORS_SUBFEATURE_CURR_CRIT },
+ { "average", SENSORS_SUBFEATURE_CURR_AVERAGE },
+ { "lowest", SENSORS_SUBFEATURE_CURR_LOWEST },
+ { "highest", SENSORS_SUBFEATURE_CURR_HIGHEST },
+ { "alarm", SENSORS_SUBFEATURE_CURR_ALARM },
+ { "min_alarm", SENSORS_SUBFEATURE_CURR_MIN_ALARM },
+ { "max_alarm", SENSORS_SUBFEATURE_CURR_MAX_ALARM },
+ { "lcrit_alarm", SENSORS_SUBFEATURE_CURR_LCRIT_ALARM },
+ { "crit_alarm", SENSORS_SUBFEATURE_CURR_CRIT_ALARM },
+ { "beep", SENSORS_SUBFEATURE_CURR_BEEP },
+ { NULL, 0 }
+};
+
+static const struct subfeature_type_match humidity_matches[] = {
+ { "input", SENSORS_SUBFEATURE_HUMIDITY_INPUT },
+ { NULL, 0 }
+};
+
+static const struct subfeature_type_match cpu_matches[] = {
+ { "vid", SENSORS_SUBFEATURE_VID },
+ { NULL, 0 }
+};
+
+static const struct subfeature_type_match intrusion_matches[] = {
+ { "alarm", SENSORS_SUBFEATURE_INTRUSION_ALARM },
+ { "beep", SENSORS_SUBFEATURE_INTRUSION_BEEP },
+ { NULL, 0 }
+};
+static struct feature_type_match matches[] = {
+ { "temp%d%c", temp_matches },
+ { "in%d%c", in_matches },
+ { "fan%d%c", fan_matches },
+ { "cpu%d%c", cpu_matches },
+ { "power%d%c", power_matches },
+ { "curr%d%c", curr_matches },
+ { "energy%d%c", energy_matches },
+ { "intrusion%d%c", intrusion_matches },
+ { "humidity%d%c", humidity_matches },
+};
+
+/* Return the subfeature type and channel number based on the subfeature
+ name */
+static
+sensors_subfeature_type sensors_subfeature_get_type(const char *name, int *nr)
+{
+ char c;
+ int i, count;
+ const struct subfeature_type_match *submatches;
+
+ /* Special case */
+ if (!strcmp(name, "beep_enable")) {
+ *nr = 0;
+ return SENSORS_SUBFEATURE_BEEP_ENABLE;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(matches); i++)
+ if ((count = sscanf(name, matches[i].name, nr, &c)))
+ break;
+
+ if (i == ARRAY_SIZE(matches) || count != 2 || c != '_')
+ return SENSORS_SUBFEATURE_UNKNOWN; /* no match */
+
+ submatches = matches[i].submatches;
+ name = strchr(name + 3, '_') + 1;
+ for (i = 0; submatches[i].name != NULL; i++)
+ if (!strcmp(name, submatches[i].name))
+ return submatches[i].type;
+
+ return SENSORS_SUBFEATURE_UNKNOWN;
+}
+
+static int sensors_compute_max(void)
+{
+ int i, j, max, offset;
+ const struct subfeature_type_match *submatches;
+ sensors_feature_type ftype;
+
+ max = 0;
+ for (i = 0; i < ARRAY_SIZE(matches); i++) {
+ submatches = matches[i].submatches;
+ for (j = 0; submatches[j].name != NULL; j++) {
+ ftype = submatches[j].type >> 8;
+
+ if (ftype < SENSORS_FEATURE_VID) {
+ offset = submatches[j].type & 0x7F;
+ if (offset >= max)
+ max = offset + 1;
+ } else {
+ offset = submatches[j].type & 0xFF;
+ if (offset >= max * 2)
+ max = ((offset + 1) + 1) / 2;
+ }
+ }
+ }
+
+ return max;
+}
+
+static int sensors_get_attr_mode(const char *device, const char *attr)
+{
+ char path[NAME_MAX];
+ struct stat st;
+ int mode = 0;
+
+ snprintf(path, NAME_MAX, "%s/%s", device, attr);
+ if (!stat(path, &st)) {
+ if (st.st_mode & S_IRUSR)
+ mode |= SENSORS_MODE_R;
+ if (st.st_mode & S_IWUSR)
+ mode |= SENSORS_MODE_W;
+ }
+ return mode;
+}
+
+static int sensors_read_dynamic_chip(sensors_chip_features *chip,
+ const char *dev_path)
+{
+ int i, fnum = 0, sfnum = 0, prev_slot;
+ static int max_subfeatures;
+ DIR *dir;
+ struct dirent *ent;
+ sensors_subfeature *all_subfeatures;
+ sensors_subfeature *dyn_subfeatures;
+ sensors_feature *dyn_features;
+ sensors_feature_type ftype;
+ sensors_subfeature_type sftype;
+
+ if (!(dir = opendir(dev_path)))
+ return -errno;
+
+ /* Dynamically figure out the max number of subfeatures */
+ if (!max_subfeatures)
+ max_subfeatures = sensors_compute_max();
+
+ /* We use a large sparse table at first to store all found
+ subfeatures, so that we can store them sorted at type and index
+ and then later create a dense sorted table. */
+ all_subfeatures = calloc(ALL_POSSIBLE_SUBFEATURES,
+ sizeof(sensors_subfeature));
+ if (!all_subfeatures)
+ sensors_fatal_error(__func__, "Out of memory");
+
+ while ((ent = readdir(dir))) {
+ char *name;
+ int nr;
+
+ /* Skip directories and symlinks */
+ if (ent->d_type != DT_REG)
+ continue;
+
+ name = ent->d_name;
+
+ sftype = sensors_subfeature_get_type(name, &nr);
+ if (sftype == SENSORS_SUBFEATURE_UNKNOWN)
+ continue;
+ ftype = sftype >> 8;
+
+ /* Adjust the channel number */
+ switch (ftype) {
+ case SENSORS_FEATURE_FAN:
+ case SENSORS_FEATURE_TEMP:
+ case SENSORS_FEATURE_POWER:
+ case SENSORS_FEATURE_ENERGY:
+ case SENSORS_FEATURE_CURR:
+ case SENSORS_FEATURE_HUMIDITY:
+ nr--;
+ break;
+ default:
+ break;
+ }
+
+ if (nr < 0 || nr >= MAX_SENSORS_PER_TYPE) {
+ /* More sensors of one type than MAX_SENSORS_PER_TYPE,
+ we have to ignore it */
+#ifdef DEBUG
+ sensors_fatal_error(__func__,
+ "Increase MAX_SENSORS_PER_TYPE!");
+#endif
+ continue;
+ }
+
+ /* "calculate" a place to store the subfeature in our sparse,
+ sorted table */
+ switch (ftype) {
+ case SENSORS_FEATURE_VID:
+ case SENSORS_FEATURE_INTRUSION:
+ i = SUB_OFFSET_OTHER +
+ (ftype - SENSORS_FEATURE_VID) * FEATURE_TYPE_SIZE +
+ nr * FEATURE_SIZE + (sftype & 0xFF);
+ break;
+ case SENSORS_FEATURE_BEEP_ENABLE:
+ i = SUB_OFFSET_MISC +
+ (ftype - SENSORS_FEATURE_BEEP_ENABLE);
+ break;
+ default:
+ i = ftype * FEATURE_TYPE_SIZE +
+ nr * FEATURE_SIZE +
+ ((sftype & 0x80) >> 7) * max_subfeatures +
+ (sftype & 0x7F);
+ }
+
+ if (all_subfeatures[i].name) {
+#ifdef DEBUG
+ sensors_fatal_error(__func__, "Duplicate subfeature");
+#endif
+ continue;
+ }
+
+ /* fill in the subfeature members */
+ all_subfeatures[i].type = sftype;
+ all_subfeatures[i].name = strdup(name);
+ if (!all_subfeatures[i].name)
+ sensors_fatal_error(__func__, "Out of memory");
+
+ /* Other and misc subfeatures are never scaled */
+ if (sftype < SENSORS_SUBFEATURE_VID && !(sftype & 0x80))
+ all_subfeatures[i].flags |= SENSORS_COMPUTE_MAPPING;
+ all_subfeatures[i].flags |= sensors_get_attr_mode(dev_path, name);
+
+ sfnum++;
+ }
+ closedir(dir);
+
+ if (!sfnum) { /* No subfeature */
+ chip->subfeature = NULL;
+ goto exit_free;
+ }
+
+ /* How many main features? */
+ prev_slot = -1;
+ for (i = 0; i < ALL_POSSIBLE_SUBFEATURES; i++) {
+ if (!all_subfeatures[i].name)
+ continue;
+
+ if (i >= SUB_OFFSET_MISC || i / FEATURE_SIZE != prev_slot) {
+ fnum++;
+ prev_slot = i / FEATURE_SIZE;
+ }
+ }
+
+ dyn_subfeatures = calloc(sfnum, sizeof(sensors_subfeature));
+ dyn_features = calloc(fnum, sizeof(sensors_feature));
+ if (!dyn_subfeatures || !dyn_features)
+ sensors_fatal_error(__func__, "Out of memory");
+
+ /* Copy from the sparse array to the compact array */
+ sfnum = 0;
+ fnum = -1;
+ prev_slot = -1;
+ for (i = 0; i < ALL_POSSIBLE_SUBFEATURES; i++) {
+ if (!all_subfeatures[i].name)
+ continue;
+
+ /* New main feature? */
+ if (i >= SUB_OFFSET_MISC || i / FEATURE_SIZE != prev_slot) {
+ ftype = all_subfeatures[i].type >> 8;
+ fnum++;
+ prev_slot = i / FEATURE_SIZE;
+
+ dyn_features[fnum].name = get_feature_name(ftype,
+ all_subfeatures[i].name);
+ dyn_features[fnum].number = fnum;
+ dyn_features[fnum].first_subfeature = sfnum;
+ dyn_features[fnum].type = ftype;
+ }
+
+ dyn_subfeatures[sfnum] = all_subfeatures[i];
+ dyn_subfeatures[sfnum].number = sfnum;
+ /* Back to the feature */
+ dyn_subfeatures[sfnum].mapping = fnum;
+
+ sfnum++;
+ }
+
+ chip->subfeature = dyn_subfeatures;
+ chip->subfeature_count = sfnum;
+ chip->feature = dyn_features;
+ chip->feature_count = ++fnum;
+
+exit_free:
+ free(all_subfeatures);
+ return 0;
+}
+
+/* returns !0 if sysfs filesystem was found, 0 otherwise */
+int sensors_init_sysfs(void)
+{
+ struct statfs statfsbuf;
+
+ snprintf(sensors_sysfs_mount, NAME_MAX, "%s", "/sys");
+ if (statfs(sensors_sysfs_mount, &statfsbuf) < 0
+ || statfsbuf.f_type != SYSFS_MAGIC)
+ return 0;
+
+ return 1;
+}
+
+/* returns: number of devices added (0 or 1) if successful, <0 otherwise */
+static int sensors_read_one_sysfs_chip(const char *dev_path,
+ const char *dev_name,
+ const char *hwmon_path)
+{
+ int domain, bus, slot, fn, vendor, product, id;
+ int err = -SENSORS_ERR_KERNEL;
+ char *bus_attr;
+ char bus_path[NAME_MAX];
+ char linkpath[NAME_MAX];
+ char subsys_path[NAME_MAX], *subsys;
+ int sub_len;
+ sensors_chip_features entry;
+
+ /* ignore any device without name attribute */
+ if (!(entry.chip.prefix = sysfs_read_attr(hwmon_path, "name")))
+ return 0;
+
+ entry.chip.path = strdup(hwmon_path);
+ if (!entry.chip.path)
+ sensors_fatal_error(__func__, "Out of memory");
+
+ if (dev_path == NULL) {
+ /* Virtual device */
+ entry.chip.bus.type = SENSORS_BUS_TYPE_VIRTUAL;
+ entry.chip.bus.nr = 0;
+ /* For now we assume that virtual devices are unique */
+ entry.chip.addr = 0;
+ goto done;
+ }
+
+ /* Find bus type */
+ snprintf(linkpath, NAME_MAX, "%s/subsystem", dev_path);
+ sub_len = readlink(linkpath, subsys_path, NAME_MAX - 1);
+ if (sub_len < 0 && errno == ENOENT) {
+ /* Fallback to "bus" link for kernels <= 2.6.17 */
+ snprintf(linkpath, NAME_MAX, "%s/bus", dev_path);
+ sub_len = readlink(linkpath, subsys_path, NAME_MAX - 1);
+ }
+ if (sub_len < 0) {
+ /* Older kernels (<= 2.6.11) have neither the subsystem
+ symlink nor the bus symlink */
+ if (errno == ENOENT)
+ subsys = NULL;
+ else
+ goto exit_free;
+ } else {
+ subsys_path[sub_len] = '\0';
+ subsys = strrchr(subsys_path, '/') + 1;
+ }
+
+ if ((!subsys || !strcmp(subsys, "i2c")) &&
+ sscanf(dev_name, "%hd-%x", &entry.chip.bus.nr,
+ &entry.chip.addr) == 2) {
+ /* find out if legacy ISA or not */
+ if (entry.chip.bus.nr == 9191) {
+ entry.chip.bus.type = SENSORS_BUS_TYPE_ISA;
+ entry.chip.bus.nr = 0;
+ } else {
+ entry.chip.bus.type = SENSORS_BUS_TYPE_I2C;
+ snprintf(bus_path, sizeof(bus_path),
+ "%s/class/i2c-adapter/i2c-%d/device",
+ sensors_sysfs_mount, entry.chip.bus.nr);
+
+ if ((bus_attr = sysfs_read_attr(bus_path, "name"))) {
+ if (!strncmp(bus_attr, "ISA ", 4)) {
+ entry.chip.bus.type = SENSORS_BUS_TYPE_ISA;
+ entry.chip.bus.nr = 0;
+ }
+
+ free(bus_attr);
+ }
+ }
+ } else
+ if ((!subsys || !strcmp(subsys, "spi")) &&
+ sscanf(dev_name, "spi%hd.%d", &entry.chip.bus.nr,
+ &entry.chip.addr) == 2) {
+ /* SPI */
+ entry.chip.bus.type = SENSORS_BUS_TYPE_SPI;
+ } else
+ if ((!subsys || !strcmp(subsys, "pci")) &&
+ sscanf(dev_name, "%x:%x:%x.%x", &domain, &bus, &slot, &fn) == 4) {
+ /* PCI */
+ entry.chip.addr = (domain << 16) + (bus << 8) + (slot << 3) + fn;
+ entry.chip.bus.type = SENSORS_BUS_TYPE_PCI;
+ entry.chip.bus.nr = 0;
+ } else
+ if ((!subsys || !strcmp(subsys, "platform") ||
+ !strcmp(subsys, "of_platform"))) {
+ /* must be new ISA (platform driver) */
+ if (sscanf(dev_name, "%*[a-z0-9_].%d", &entry.chip.addr) != 1)
+ entry.chip.addr = 0;
+ entry.chip.bus.type = SENSORS_BUS_TYPE_ISA;
+ entry.chip.bus.nr = 0;
+ } else if (subsys && !strcmp(subsys, "acpi")) {
+ entry.chip.bus.type = SENSORS_BUS_TYPE_ACPI;
+ /* For now we assume that acpi devices are unique */
+ entry.chip.bus.nr = 0;
+ entry.chip.addr = 0;
+ } else
+ if (subsys && !strcmp(subsys, "hid") &&
+ sscanf(dev_name, "%x:%x:%x.%x", &bus, &vendor, &product, &id) == 4) {
+ entry.chip.bus.type = SENSORS_BUS_TYPE_HID;
+ /* As of kernel 2.6.32, the hid device names don't look good */
+ entry.chip.bus.nr = bus;
+ entry.chip.addr = id;
+ } else {
+ /* Ignore unknown device */
+ err = 0;
+ goto exit_free;
+ }
+
+done:
+ if (sensors_read_dynamic_chip(&entry, hwmon_path) < 0)
+ goto exit_free;
+ if (!entry.subfeature) { /* No subfeature, discard chip */
+ err = 0;
+ goto exit_free;
+ }
+ sensors_add_proc_chips(&entry);
+
+ return 1;
+
+exit_free:
+ free(entry.chip.prefix);
+ free(entry.chip.path);
+ return err;
+}
+
+static int sensors_add_hwmon_device_compat(const char *path,
+ const char *dev_name)
+{
+ int err;
+
+ err = sensors_read_one_sysfs_chip(path, dev_name, path);
+ if (err < 0)
+ return err;
+ return 0;
+}
+
+/* returns 0 if successful, !0 otherwise */
+static int sensors_read_sysfs_chips_compat(void)
+{
+ int ret;
+
+ ret = sysfs_foreach_busdev("i2c", sensors_add_hwmon_device_compat);
+ if (ret && ret != ENOENT)
+ return -SENSORS_ERR_KERNEL;
+
+ return 0;
+}
+
+static int sensors_add_hwmon_device(const char *path, const char *classdev)
+{
+ char linkpath[NAME_MAX];
+ char device[NAME_MAX], *device_p;
+ int dev_len, err;
+ (void)classdev; /* hide warning */
+
+ snprintf(linkpath, NAME_MAX, "%s/device", path);
+ dev_len = readlink(linkpath, device, NAME_MAX - 1);
+ if (dev_len < 0) {
+ /* No device link? Treat as virtual */
+ err = sensors_read_one_sysfs_chip(NULL, NULL, path);
+ } else {
+ device[dev_len] = '\0';
+ device_p = strrchr(device, '/') + 1;
+
+ /* The attributes we want might be those of the hwmon class
+ device, or those of the device itself. */
+ err = sensors_read_one_sysfs_chip(linkpath, device_p, path);
+ if (err == 0)
+ err = sensors_read_one_sysfs_chip(linkpath, device_p,
+ linkpath);
+ }
+ if (err < 0)
+ return err;
+ return 0;
+}
+
+/* returns 0 if successful, !0 otherwise */
+int sensors_read_sysfs_chips(void)
+{
+ int ret;
+
+ ret = sysfs_foreach_classdev("hwmon", sensors_add_hwmon_device);
+ if (ret == ENOENT) {
+ /* compatibility function for kernel 2.6.n where n <= 13 */
+ return sensors_read_sysfs_chips_compat();
+ }
+
+ if (ret > 0)
+ ret = -SENSORS_ERR_KERNEL;
+ return ret;
+}
+
+/* returns 0 if successful, !0 otherwise */
+static int sensors_add_i2c_bus(const char *path, const char *classdev)
+{
+ sensors_bus entry;
+
+ if (sscanf(classdev, "i2c-%hd", &entry.bus.nr) != 1 ||
+ entry.bus.nr == 9191) /* legacy ISA */
+ return 0;
+ entry.bus.type = SENSORS_BUS_TYPE_I2C;
+
+ /* Get the adapter name from the classdev "name" attribute
+ * (Linux 2.6.20 and later). If it fails, fall back to
+ * the device "name" attribute (for older kernels). */
+ entry.adapter = sysfs_read_attr(path, "name");
+ if (!entry.adapter)
+ entry.adapter = sysfs_read_attr(path, "device/name");
+ if (entry.adapter)
+ sensors_add_proc_bus(&entry);
+
+ return 0;
+}
+
+/* returns 0 if successful, !0 otherwise */
+int sensors_read_sysfs_bus(void)
+{
+ int ret;
+
+ ret = sysfs_foreach_classdev("i2c-adapter", sensors_add_i2c_bus);
+ if (ret == ENOENT)
+ ret = sysfs_foreach_busdev("i2c", sensors_add_i2c_bus);
+ if (ret && ret != ENOENT)
+ return -SENSORS_ERR_KERNEL;
+
+ return 0;
+}
+
+int sensors_read_sysfs_attr(const sensors_chip_name *name,
+ const sensors_subfeature *subfeature,
+ double *value)
+{
+ char n[NAME_MAX];
+ int f;
+
+ snprintf(n, NAME_MAX, "%s/%s", name->path, subfeature->name);
+ if ((f = open(n, O_RDONLY)) != -1) {
+ int res, err = 0;
+ char buf[512];
+ int count;
+
+ errno = 0;
+ if ((count = read(f, buf, sizeof(buf) - 1)) == -1) {
+ if (errno == EIO)
+ err = -SENSORS_ERR_IO;
+ else
+ err = -SENSORS_ERR_ACCESS_R;
+ } else {
+ buf[count] = '\0';
+ errno = 0;
+ res = sscanf(buf, "%lf", value);
+ if (res == EOF && errno == EIO)
+ err = -SENSORS_ERR_IO;
+ else if (res != 1)
+ err = -SENSORS_ERR_ACCESS_R;
+ }
+ res = close(f);
+ if (err)
+ return err;
+
+ if (res != 0) {
+ if (errno == EIO)
+ return -SENSORS_ERR_IO;
+ else
+ return -SENSORS_ERR_ACCESS_R;
+ }
+ if (!sensors_sysfs_no_scaling)
+ *value /= get_type_scaling(subfeature->type);
+ } else
+ return -SENSORS_ERR_KERNEL;
+
+ return 0;
+}
+
+int sensors_write_sysfs_attr(const sensors_chip_name *name,
+ const sensors_subfeature *subfeature,
+ double value)
+{
+ char n[NAME_MAX];
+ FILE *f;
+
+ snprintf(n, NAME_MAX, "%s/%s", name->path, subfeature->name);
+ if ((f = fopen(n, "w"))) {
+ int res, err = 0;
+
+ if (!sensors_sysfs_no_scaling)
+ value *= get_type_scaling(subfeature->type);
+ res = fprintf(f, "%d", (int) value);
+ if (res == -EIO)
+ err = -SENSORS_ERR_IO;
+ else if (res < 0)
+ err = -SENSORS_ERR_ACCESS_W;
+ res = fclose(f);
+ if (err)
+ return err;
+
+ if (res == EOF) {
+ if (errno == EIO)
+ return -SENSORS_ERR_IO;
+ else
+ return -SENSORS_ERR_ACCESS_W;
+ }
+ } else
+ return -SENSORS_ERR_KERNEL;
+
+ return 0;
+}