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"
23 #include "common.h"
24 #include "plugin.h"
25 #include "configfile.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[] = {
33 "Device",
34 "IgnoreSelected",
35 "ForceUseProcfs"
36 };
38 const char *const dirname_sysfs = "/sys/class/thermal";
39 const char *const dirname_procfs = "/proc/acpi/thermal_zone";
41 static _Bool force_procfs = 0;
42 static ignorelist_t *device_list;
44 enum dev_type {
45 TEMP = 0,
46 COOLING_DEV
47 };
49 static void thermal_submit (const char *plugin_instance, enum dev_type dt,
50 gauge_t value)
51 {
52 value_list_t vl = VALUE_LIST_INIT;
53 value_t v;
55 v.gauge = value;
56 vl.values = &v;
58 sstrncpy (vl.plugin, "thermal", sizeof(vl.plugin));
59 if (plugin_instance != NULL)
60 sstrncpy (vl.plugin_instance, plugin_instance,
61 sizeof (vl.plugin_instance));
62 sstrncpy (vl.type,
63 (dt == TEMP) ? "temperature" : "gauge",
64 sizeof (vl.type));
66 plugin_dispatch_values (&vl);
67 }
69 static int thermal_sysfs_device_read (const char __attribute__((unused)) *dir,
70 const char *name, void __attribute__((unused)) *user_data)
71 {
72 char filename[256];
73 char data[1024];
74 int len;
75 _Bool success = 0;
77 if (device_list && ignorelist_match (device_list, name))
78 return -1;
80 len = snprintf (filename, sizeof (filename),
81 "%s/%s/temp", dirname_sysfs, name);
82 if ((len < 0) || ((size_t) len >= sizeof (filename)))
83 return -1;
85 len = read_file_contents (filename, data, sizeof(data));
86 if (len > 1 && data[--len] == '\n') {
87 char *endptr = NULL;
88 double temp;
90 data[len] = 0;
91 errno = 0;
92 temp = strtod (data, &endptr) / 1000.0;
94 if (endptr == data + len && errno == 0) {
95 thermal_submit(name, TEMP, temp);
96 success = 1;
97 }
98 }
100 len = snprintf (filename, sizeof (filename),
101 "%s/%s/cur_state", dirname_sysfs, name);
102 if ((len < 0) || ((size_t) len >= sizeof (filename)))
103 return -1;
105 len = read_file_contents (filename, data, sizeof(data));
106 if (len > 1 && data[--len] == '\n') {
107 char *endptr = NULL;
108 double state;
110 data[len] = 0;
111 errno = 0;
112 state = strtod (data, &endptr);
114 if (endptr == data + len && errno == 0) {
115 thermal_submit(name, COOLING_DEV, state);
116 success = 1;
117 }
118 }
120 return (success ? 0 : -1);
121 }
123 static int thermal_procfs_device_read (const char __attribute__((unused)) *dir,
124 const char *name, void __attribute__((unused)) *user_data)
125 {
126 const char str_temp[] = "temperature:";
127 char filename[256];
128 char data[1024];
129 int len;
131 if (device_list && ignorelist_match (device_list, name))
132 return -1;
134 /**
135 * rechot ~ # cat /proc/acpi/thermal_zone/THRM/temperature
136 * temperature: 55 C
137 */
139 len = snprintf (filename, sizeof (filename),
140 "%s/%s/temperature", dirname_procfs, name);
141 if ((len < 0) || ((size_t) len >= sizeof (filename)))
142 return -1;
144 len = read_file_contents (filename, data, sizeof(data));
145 if ((len > 0) && ((size_t) len > sizeof(str_temp))
146 && (data[--len] == '\n')
147 && (! strncmp(data, str_temp, sizeof(str_temp)-1))) {
148 char *endptr = NULL;
149 double temp;
150 double factor, add;
152 if (data[--len] == 'C') {
153 add = 0;
154 factor = 1.0;
155 } else if (data[len] == 'F') {
156 add = -32;
157 factor = 5.0/9.0;
158 } else if (data[len] == 'K') {
159 add = -273.15;
160 factor = 1.0;
161 } else
162 return -1;
164 while (len > 0 && data[--len] == ' ')
165 ;
166 data[len + 1] = 0;
168 while (len > 0 && data[--len] != ' ')
169 ;
170 ++len;
172 errno = 0;
173 temp = (strtod (data + len, &endptr) + add) * factor;
175 if (endptr != data + len && errno == 0) {
176 thermal_submit(name, TEMP, temp);
177 return 0;
178 }
179 }
181 return -1;
182 }
184 static int thermal_config (const char *key, const char *value)
185 {
186 if (device_list == NULL)
187 device_list = ignorelist_create (1);
189 if (strcasecmp (key, "Device") == 0)
190 {
191 if (ignorelist_add (device_list, value))
192 {
193 ERROR ("thermal plugin: "
194 "Cannot add value to ignorelist.");
195 return 1;
196 }
197 }
198 else if (strcasecmp (key, "IgnoreSelected") == 0)
199 {
200 ignorelist_set_invert (device_list, 1);
201 if (IS_TRUE (value))
202 ignorelist_set_invert (device_list, 0);
203 }
204 else if (strcasecmp (key, "ForceUseProcfs") == 0)
205 {
206 force_procfs = 0;
207 if (IS_TRUE (value))
208 force_procfs = 1;
209 }
210 else
211 {
212 return -1;
213 }
215 return 0;
216 }
218 static int thermal_sysfs_read (void)
219 {
220 return walk_directory (dirname_sysfs, thermal_sysfs_device_read,
221 /* user_data = */ NULL, /* include hidden */ 0);
222 }
224 static int thermal_procfs_read (void)
225 {
226 return walk_directory (dirname_procfs, thermal_procfs_device_read,
227 /* user_data = */ NULL, /* include hidden */ 0);
228 }
230 static int thermal_init (void)
231 {
232 int ret = -1;
234 if (!force_procfs && access (dirname_sysfs, R_OK | X_OK) == 0) {
235 ret = plugin_register_read ("thermal", thermal_sysfs_read);
236 } else if (access (dirname_procfs, R_OK | X_OK) == 0) {
237 ret = plugin_register_read ("thermal", thermal_procfs_read);
238 }
240 return ret;
241 }
243 static int thermal_shutdown (void)
244 {
245 ignorelist_free (device_list);
247 return 0;
248 }
250 void module_register (void)
251 {
252 plugin_register_config ("thermal", thermal_config,
253 config_keys, STATIC_ARRAY_SIZE(config_keys));
254 plugin_register_init ("thermal", thermal_init);
255 plugin_register_shutdown ("thermal", thermal_shutdown);
256 }