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-rw-r--r--plugin_i2c_sensors.c361
1 files changed, 361 insertions, 0 deletions
diff --git a/plugin_i2c_sensors.c b/plugin_i2c_sensors.c
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+/* $Id: plugin_i2c_sensors.c 1082 2010-01-17 14:40:03Z volker $
+ * $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/plugin_i2c_sensors.c $
+ *
+ * I2C sensors plugin
+ *
+ * Copyright (C) 2003, 2004 Xavier Vello <xavier66@free.fr>
+ * Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
+ *
+ * This file is part of LCD4Linux.
+ *
+ * LCD4Linux is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * LCD4Linux 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 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+/*
+ * exported functions:
+ *
+ * int plugin_init_i2c_sensors (void)
+ * adds function i2c_sensors() to retrieve informations from
+ * the i2c sensors via sysfs or procfs interface
+ *
+ * -- WARNING --
+ * This plugin should detect where your sensors are at startup.
+ * If you can't get any token to work, ensure you don't get
+ * an error message with "lcd4linux -Fvvv".
+ *
+ * If so, try to force the path to your sensors in the conf like this :
+ * for sysfs: i2c_sensors-path '/sys/bus/i2c/devices/0-6000/'
+ * for procfs: i2c_sensors-path '/proc/sys/dev/sensors/via686a-isa-6000'
+ * /!\ these path are for my system, change the last dir according to yours
+ */
+
+/*
+ * Available tokens : # represents an int from 1 to 3 (or more)
+ * temp_input# -> temperature of sensor # (in ∞C)
+ * temp_max# and temp_hyst# -> max and min of sensor #
+ * in_input#, in_min# and in_max# -> voltages
+ * fan_input# -> speed (in RPM) of fan #
+ * fan_min# and fan_div#
+ *
+ * Tokens avaible only via sysfs if suported by your sensors:
+ * curr_input#, curr_min# and curr_max# -> value of current (in amps)
+ * pwm#
+ * temp_crit# -> critical value of sensor #
+ * vid -> cpu core voltage
+ * and maybe others
+ * (see /usr/src/linux/Documentation/i2c/sysfs-interface on linux 2.6)
+ */
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <dirent.h>
+
+#include "debug.h"
+#include "plugin.h"
+#include "cfg.h"
+#include "hash.h"
+#include "qprintf.h"
+#include "evaluator.h" // if strndup() is not available
+
+#ifdef WITH_DMALLOC
+#include <dmalloc.h>
+#endif
+
+static char *path = NULL;
+static HASH I2Csensors;
+
+static const char *procfs_tokens[4][3] = {
+ {"temp_hyst", "temp_max", "temp_input"}, /* for temp# */
+ {"in_min", "in_max", "in_input"}, /* for in# */
+ {"fan_div1", "fan_div2", "fan_div3"}, /* for fan_div */
+ {"fan_min", "fan_input", ""} /* for fan# */
+};
+
+static int (*parse_i2c_sensors) (const char *key);
+
+ /***********************************************\
+ * Parsing for new 2.6 kernels 'sysfs' interface *
+ \***********************************************/
+
+static int parse_i2c_sensors_sysfs(const char *key)
+{
+ char val[32];
+ char buffer[32];
+ char file[64];
+ FILE *stream;
+
+ strcpy(file, path);
+ strcat(file, key);
+
+ stream = fopen(file, "r");
+ if (stream == NULL) {
+ error("i2c_sensors: fopen(%s) failed: %s", file, strerror(errno));
+ return -1;
+ }
+ fgets(buffer, sizeof(buffer), stream);
+ fclose(stream);
+
+ if (buffer[0] == '\0') {
+ error("i2c_sensors: %s empty ?!", file);
+ return -1;
+ }
+
+ /* now the formating stuff, depending on the file : */
+ /* Some values must be divided by 1000, the others */
+ /* are parsed directly (we just remove the \n). */
+ if (!strncmp(key, "temp", 4) || !strncmp(key, "curr", 4) || !strncmp(key, "in", 2) || !strncmp(key, "vid", 3)) {
+ snprintf(val, sizeof(val), "%f", strtod(buffer, NULL) / 1000.0);
+ } else {
+ qprintf(val, sizeof(val), "%s", buffer);
+ /* we supress this nasty \n at the end */
+ val[strlen(val) - 1] = '\0';
+ }
+
+ hash_put(&I2Csensors, key, val);
+
+ return 0;
+
+}
+
+ /************************************************\
+ * Parsing for old 2.4 kernels 'procfs' interface *
+ \************************************************/
+
+static int parse_i2c_sensors_procfs(const char *key)
+{
+ char file[64];
+ FILE *stream;
+ char buffer[32];
+
+ char *value;
+ char *running;
+ int pos = 0;
+ const char delim[3] = " \n";
+ char final_key[32];
+ const char *number = &key[strlen(key) - 1];
+ int tokens_index;
+ /* debug("%s -> %s", key, number); */
+ strcpy(file, path);
+
+ if (!strncmp(key, "temp_", 5)) {
+ tokens_index = 0;
+ strcat(file, "temp");
+ strcat(file, number);
+ } else if (!strncmp(key, "in_", 3)) {
+ tokens_index = 1;
+ strcat(file, "in");
+ strcat(file, number);
+ } else if (!strncmp(key, "fan_div", 7)) {
+ tokens_index = 2;
+ strcat(file, "fan_div");
+ number = "";
+ } else if (!strncmp(key, "fan_", 4)) {
+ tokens_index = 3;
+ strcat(file, "fan");
+ strcat(file, number);
+ } else {
+ return -1;
+ }
+
+ stream = fopen(file, "r");
+ if (stream == NULL) {
+ error("i2c_sensors: fopen(%s) failed: %s", file, strerror(errno));
+ return -1;
+ }
+ fgets(buffer, sizeof(buffer), stream);
+ fclose(stream);
+
+ if (buffer[0] == '\0') {
+ error("i2c_sensors: %s empty ?!", file);
+ return -1;
+ }
+
+ running = strndup(buffer, sizeof(buffer));
+ while (1) {
+ value = strsep(&running, delim);
+ /* debug("%s pos %i -> %s", file, pos , value); */
+ if (!value || !strcmp(value, "")) {
+ /* debug("%s pos %i -> BREAK", file, pos); */
+ break;
+ } else {
+ qprintf(final_key, sizeof(final_key), "%s%s", procfs_tokens[tokens_index][pos], number);
+ /* debug ("%s -> %s", final_key, value); */
+ hash_put(&I2Csensors, final_key, value);
+ pos++;
+ }
+ }
+ free(running);
+ return 0;
+}
+
+ /*****************************************\
+ * Common functions (path search and init) *
+ \*****************************************/
+
+
+static void my_i2c_sensors_path(const char *method)
+{
+ struct dirent *dir;
+ struct dirent *file;
+ const char *base;
+ char dname[64];
+ DIR *fd1;
+ DIR *fd2;
+ int done;
+
+ if (!strcmp(method, "sysfs")) {
+ base = "/sys/bus/i2c/devices/";
+ } else if (!strcmp(method, "procfs")) {
+ base = "/proc/sys/dev/sensors/";
+ /*base="/sensors_2.4/"; // fake dir to test without rebooting 2.4 ;) */
+ } else {
+ return;
+ }
+
+ fd1 = opendir(base);
+ if (!fd1) {
+ return;
+ }
+
+ while ((dir = readdir(fd1))) {
+ /* Skip non-directories and '.' and '..' */
+ if ((dir->d_type != DT_DIR && dir->d_type != DT_LNK) || strcmp(dir->d_name, ".") == 0
+ || strcmp(dir->d_name, "..") == 0) {
+ continue;
+ }
+
+ /* dname is the absolute path */
+ strcpy(dname, base);
+ strcat(dname, dir->d_name);
+ strcat(dname, "/");
+
+ fd2 = opendir(dname);
+ done = 0;
+ while ((file = readdir(fd2))) {
+ /* FIXME : do all sensors have a temp_input1 ? */
+ if (!strcmp(file->d_name, "temp_input1") || !strcmp(file->d_name, "temp1_input")
+ || !strcmp(file->d_name, "temp1")) {
+ path = realloc(path, strlen(dname) + 1);
+ strcpy(path, dname);
+ done = 1;
+ break;
+ }
+ }
+ closedir(fd2);
+ if (done)
+ break;
+ }
+ closedir(fd1);
+}
+
+
+static int configure_i2c_sensors(void)
+{
+ static int configured = 0;
+ char *path_cfg;
+
+ if (configured != 0)
+ return configured;
+
+ path_cfg = cfg_get(NULL, "i2c_sensors-path", "");
+ if (path_cfg == NULL || *path_cfg == '\0') {
+ /* debug("No path to i2c sensors found in the conf, calling my_i2c_sensors_path()"); */
+ my_i2c_sensors_path("sysfs");
+ if (!path)
+ my_i2c_sensors_path("procfs");
+
+ if (!path) {
+ error("i2c_sensors: unable to autodetect i2c sensors!");
+ configured = -1;
+ return configured;
+ }
+
+ debug("using i2c sensors at %s (autodetected)", path);
+
+ } else {
+ if (path_cfg[strlen(path_cfg) - 1] != '/') {
+ /* the headless user forgot the trailing slash :/ */
+ error("i2c_sensors: please add a trailing slash to %s from %s", path_cfg, cfg_source());
+ path_cfg = realloc(path_cfg, strlen(path_cfg) + 2);
+ strcat(path_cfg, "/");
+ }
+ debug("using i2c sensors at %s (from %s)", path_cfg, cfg_source());
+ path = realloc(path, strlen(path_cfg) + 1);
+ strcpy(path, path_cfg);
+ }
+ if (path_cfg)
+ free(path_cfg);
+
+ /* we activate the function only if there's a possibly path found */
+ if (strncmp(path, "/sys", 4) == 0) {
+ parse_i2c_sensors = parse_i2c_sensors_sysfs;
+ } else if (strncmp(path, "/proc", 5) == 0) {
+ parse_i2c_sensors = parse_i2c_sensors_procfs;
+ } else {
+ error("i2c_sensors: unknown path %s, should start with /sys or /proc", path);
+ configured = -1;
+ return configured;
+ }
+
+ hash_create(&I2Csensors);
+
+ configured = 1;
+ return configured;
+}
+
+
+void my_i2c_sensors(RESULT * result, RESULT * arg)
+{
+ int age;
+ char *key;
+ char *val;
+
+ if (configure_i2c_sensors() < 0) {
+ SetResult(&result, R_STRING, "??");
+ return;
+ }
+
+ key = R2S(arg);
+ age = hash_age(&I2Csensors, key);
+ if (age < 0 || age > 250) {
+ parse_i2c_sensors(key);
+ }
+ val = hash_get(&I2Csensors, key, NULL);
+ if (val) {
+ SetResult(&result, R_STRING, val);
+ } else {
+ SetResult(&result, R_STRING, "??");
+ }
+}
+
+
+int plugin_init_i2c_sensors(void)
+{
+ AddFunction("i2c_sensors", 1, my_i2c_sensors);
+ return 0;
+}
+
+
+void plugin_exit_i2c_sensors(void)
+{
+ hash_destroy(&I2Csensors);
+}
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