1 /**
2 * collectd - src/thermal.c
3 * Copyright (C) 2008 Michał Mirosław
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 as published by the
7 * Free Software Foundation; only version 2 of the License is applicable.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 * Authors:
19 * Michał Mirosław <mirq-linux at rere.qmqm.pl>
20 **/
22 #include "collectd.h"
24 #include "common.h"
25 #include "plugin.h"
26 #include "utils_ignorelist.h"
28 #if !KERNEL_LINUX
29 #error "This module is for Linux only."
30 #endif
32 static const char *config_keys[] = {"Device", "IgnoreSelected",
33 "ForceUseProcfs"};
35 static const char *const dirname_sysfs = "/sys/class/thermal";
36 static const char *const dirname_procfs = "/proc/acpi/thermal_zone";
38 static _Bool force_procfs = 0;
39 static ignorelist_t *device_list;
41 enum dev_type { TEMP = 0, COOLING_DEV };
43 static void thermal_submit(const char *plugin_instance, enum dev_type dt,
44 value_t value) {
45 value_list_t vl = VALUE_LIST_INIT;
47 vl.values = &value;
48 vl.values_len = 1;
50 sstrncpy(vl.plugin, "thermal", sizeof(vl.plugin));
51 if (plugin_instance != NULL)
52 sstrncpy(vl.plugin_instance, plugin_instance, sizeof(vl.plugin_instance));
53 sstrncpy(vl.type, (dt == TEMP) ? "temperature" : "gauge", sizeof(vl.type));
55 plugin_dispatch_values(&vl);
56 }
58 static int thermal_sysfs_device_read(const char __attribute__((unused)) * dir,
59 const char *name,
60 void __attribute__((unused)) * user_data) {
61 char filename[PATH_MAX];
62 _Bool success = 0;
63 value_t value;
65 if (device_list && ignorelist_match(device_list, name))
66 return -1;
68 ssnprintf(filename, sizeof(filename), "%s/%s/temp", dirname_sysfs, name);
69 if (parse_value_file(filename, &value, DS_TYPE_GAUGE) == 0) {
70 value.gauge /= 1000.0;
71 thermal_submit(name, TEMP, value);
72 success = 1;
73 }
75 ssnprintf(filename, sizeof(filename), "%s/%s/cur_state", dirname_sysfs, name);
76 if (parse_value_file(filename, &value, DS_TYPE_GAUGE) == 0) {
77 thermal_submit(name, COOLING_DEV, value);
78 success = 1;
79 }
81 return (success ? 0 : -1);
82 }
84 static int thermal_procfs_device_read(const char __attribute__((unused)) * dir,
85 const char *name,
86 void __attribute__((unused)) *
87 user_data) {
88 const char str_temp[] = "temperature:";
89 char filename[256];
90 char data[1024];
91 int len;
93 if (device_list && ignorelist_match(device_list, name))
94 return -1;
96 /**
97 * rechot ~ # cat /proc/acpi/thermal_zone/THRM/temperature
98 * temperature: 55 C
99 */
101 len = ssnprintf(filename, sizeof(filename), "%s/%s/temperature",
102 dirname_procfs, name);
103 if ((len < 0) || ((size_t)len >= sizeof(filename)))
104 return -1;
106 len = (ssize_t)read_file_contents(filename, data, sizeof(data));
107 if ((len > 0) && ((size_t)len > sizeof(str_temp)) && (data[--len] == '\n') &&
108 (!strncmp(data, str_temp, sizeof(str_temp) - 1))) {
109 char *endptr = NULL;
110 double temp;
111 double factor, add;
113 if (data[--len] == 'C') {
114 add = 0;
115 factor = 1.0;
116 } else if (data[len] == 'F') {
117 add = -32;
118 factor = 5.0 / 9.0;
119 } else if (data[len] == 'K') {
120 add = -273.15;
121 factor = 1.0;
122 } else
123 return -1;
125 while (len > 0 && data[--len] == ' ')
126 ;
127 data[len + 1] = 0;
129 while (len > 0 && data[--len] != ' ')
130 ;
131 ++len;
133 errno = 0;
134 temp = (strtod(data + len, &endptr) + add) * factor;
136 if (endptr != data + len && errno == 0) {
137 thermal_submit(name, TEMP, (value_t){.gauge = temp});
138 return 0;
139 }
140 }
142 return -1;
143 }
145 static int thermal_config(const char *key, const char *value) {
146 if (device_list == NULL)
147 device_list = ignorelist_create(1);
149 if (strcasecmp(key, "Device") == 0) {
150 if (ignorelist_add(device_list, value)) {
151 ERROR("thermal plugin: "
152 "Cannot add value to ignorelist.");
153 return 1;
154 }
155 } else if (strcasecmp(key, "IgnoreSelected") == 0) {
156 ignorelist_set_invert(device_list, 1);
157 if (IS_TRUE(value))
158 ignorelist_set_invert(device_list, 0);
159 } else if (strcasecmp(key, "ForceUseProcfs") == 0) {
160 force_procfs = 0;
161 if (IS_TRUE(value))
162 force_procfs = 1;
163 } else {
164 return -1;
165 }
167 return 0;
168 }
170 static int thermal_sysfs_read(void) {
171 return walk_directory(dirname_sysfs, thermal_sysfs_device_read,
172 /* user_data = */ NULL, /* include hidden */ 0);
173 }
175 static int thermal_procfs_read(void) {
176 return walk_directory(dirname_procfs, thermal_procfs_device_read,
177 /* user_data = */ NULL, /* include hidden */ 0);
178 }
180 static int thermal_init(void) {
181 int ret = -1;
183 if (!force_procfs && access(dirname_sysfs, R_OK | X_OK) == 0) {
184 ret = plugin_register_read("thermal", thermal_sysfs_read);
185 } else if (access(dirname_procfs, R_OK | X_OK) == 0) {
186 ret = plugin_register_read("thermal", thermal_procfs_read);
187 }
189 return ret;
190 }
192 static int thermal_shutdown(void) {
193 ignorelist_free(device_list);
195 return 0;
196 }
198 void module_register(void) {
199 plugin_register_config("thermal", thermal_config, config_keys,
200 STATIC_ARRAY_SIZE(config_keys));
201 plugin_register_init("thermal", thermal_init);
202 plugin_register_shutdown("thermal", thermal_shutdown);
203 }