6c7e2b50d6d17b4e6e77be41d71fc04ff24d911b
1 /**
2 * collectd - src/battery.c
3 * Copyright (C) 2006 Florian octo Forster
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; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Authors:
20 * Florian octo Forster <octo at verplant.org>
21 **/
23 #include "collectd.h"
24 #include "common.h"
25 #include "plugin.h"
27 #define MODULE_NAME "battery"
28 #define BUFSIZE 512
30 #if defined(KERNEL_LINUX)
31 # define BATTERY_HAVE_READ 1
32 #else
33 # define BATTERY_HAVE_READ 0
34 #endif
36 #define INVALID_VALUE 47841.29
38 static char *battery_current_file = "battery-%s/current.rrd";
39 static char *battery_voltage_file = "battery-%s/voltage.rrd";
40 static char *battery_charge_file = "battery-%s/charge.rrd";
42 static char *ds_def_current[] =
43 {
44 "DS:current:GAUGE:25:U:U",
45 NULL
46 };
47 static int ds_num_current = 1;
49 static char *ds_def_voltage[] =
50 {
51 "DS:voltage:GAUGE:25:U:U",
52 NULL
53 };
54 static int ds_num_voltage = 1;
56 static char *ds_def_charge[] =
57 {
58 "DS:charge:GAUGE:25:0:U",
59 NULL
60 };
61 static int ds_num_charge = 1;
63 static int battery_pmu_num = 0;
64 static char *battery_pmu_file = "/proc/pmu/battery_%i";
66 static void battery_init (void)
67 {
68 #if BATTERY_HAVE_READ
69 int len;
70 char filename[BUFSIZE];
72 for (battery_pmu_num = 0; ; battery_pmu_num++)
73 {
74 len = snprintf (filename, BUFSIZE, battery_pmu_file, battery_pmu_num);
76 if ((len >= BUFSIZE) || (len < 0))
77 break;
79 if (access (filename, R_OK))
80 break;
81 }
82 #endif
84 return;
85 }
87 static void battery_current_write (char *host, char *inst, char *val)
88 {
89 char filename[BUFSIZE];
90 int len;
92 len = snprintf (filename, BUFSIZE, battery_current_file, inst);
93 if ((len >= BUFSIZE) || (len < 0))
94 return;
96 rrd_update_file (host, filename, val,
97 ds_def_current, ds_num_current);
98 }
100 static void battery_voltage_write (char *host, char *inst, char *val)
101 {
102 char filename[BUFSIZE];
103 int len;
105 len = snprintf (filename, BUFSIZE, battery_voltage_file, inst);
106 if ((len >= BUFSIZE) || (len < 0))
107 return;
109 rrd_update_file (host, filename, val,
110 ds_def_voltage, ds_num_voltage);
111 }
113 static void battery_charge_write (char *host, char *inst, char *val)
114 {
115 char filename[BUFSIZE];
116 int len;
118 len = snprintf (filename, BUFSIZE, battery_charge_file, inst);
119 if ((len >= BUFSIZE) || (len < 0))
120 return;
122 rrd_update_file (host, filename, val,
123 ds_def_charge, ds_num_charge);
124 }
126 #if BATTERY_HAVE_READ
127 static void battery_submit (char *inst, double current, double voltage, double charge)
128 {
129 int len;
130 char buffer[BUFSIZE];
132 if (current != INVALID_VALUE)
133 {
134 len = snprintf (buffer, BUFSIZE, "N:%.3f", current);
136 if ((len > 0) && (len < BUFSIZE))
137 plugin_submit ("battery_current", inst, buffer);
138 }
139 else
140 {
141 plugin_submit ("battery_current", inst, "N:U");
142 }
144 if (voltage != INVALID_VALUE)
145 {
146 len = snprintf (buffer, BUFSIZE, "N:%.3f", voltage);
148 if ((len > 0) && (len < BUFSIZE))
149 plugin_submit ("battery_voltage", inst, buffer);
150 }
151 else
152 {
153 plugin_submit ("battery_voltage", inst, "N:U");
154 }
156 if (charge != INVALID_VALUE)
157 {
158 len = snprintf (buffer, BUFSIZE, "N:%.3f", charge);
160 if ((len > 0) && (len < BUFSIZE))
161 plugin_submit ("battery_charge", inst, buffer);
162 }
163 else
164 {
165 plugin_submit ("battery_charge", inst, "N:U");
166 }
167 }
169 static void battery_read (void)
170 {
171 #ifdef KERNEL_LINUX
172 FILE *fh;
173 char buffer[BUFSIZE];
174 char filename[BUFSIZE];
176 char *fields[8];
177 int numfields;
179 int i;
180 int len;
182 for (i = 0; i < battery_pmu_num; i++)
183 {
184 char batnum_str[BUFSIZE];
185 double current = INVALID_VALUE;
186 double voltage = INVALID_VALUE;
187 double charge = INVALID_VALUE;
188 double *valptr = NULL;
190 len = snprintf (filename, BUFSIZE, battery_pmu_file, i);
191 if ((len >= BUFSIZE) || (len < 0))
192 continue;
194 len = snprintf (batnum_str, BUFSIZE, "%i", i);
195 if ((len >= BUFSIZE) || (len < 0))
196 continue;
198 if ((fh = fopen (filename, "r")) == NULL)
199 continue;
201 while (fgets (buffer, BUFSIZE, fh) != NULL)
202 {
203 numfields = strsplit (buffer, fields, 8);
205 if (numfields < 3)
206 continue;
208 if (strcmp ("current", fields[0]) == 0)
209 valptr = ¤t;
210 else if (strcmp ("voltage", fields[0]) == 0)
211 valptr = &voltage;
212 else if (strcmp ("charge", fields[0]) == 0)
213 valptr = &charge;
214 else
215 valptr = NULL;
217 if (valptr != NULL)
218 {
219 char *endptr;
221 endptr = NULL;
222 errno = 0;
224 *valptr = strtod (fields[2], &endptr) / 1000.0;
226 if ((fields[2] == endptr) || (errno != 0))
227 *valptr = INVALID_VALUE;
228 }
229 }
231 if ((current != INVALID_VALUE)
232 || (voltage != INVALID_VALUE)
233 || (charge != INVALID_VALUE))
234 battery_submit (batnum_str, current, voltage, charge);
236 fclose (fh);
237 fh = NULL;
238 }
240 if (access ("/proc/acpi/battery", R_OK | X_OK) == 0)
241 {
242 double current = INVALID_VALUE;
243 double voltage = INVALID_VALUE;
244 double charge = INVALID_VALUE;
245 double *valptr = NULL;
246 int charging = 0;
248 struct dirent *ent;
249 DIR *dh;
251 if ((dh = opendir ("/proc/acpi/battery")) == NULL)
252 {
253 syslog (LOG_ERR, "Cannot open `/proc/acpi/battery': %s", strerror (errno));
254 return;
255 }
257 while ((ent = readdir (dh)) != NULL)
258 {
259 if (ent->d_name[0] == '.')
260 continue;
262 len = snprintf (filename, BUFSIZE, "/proc/acpi/battery/%s/state", ent->d_name);
263 if ((len >= BUFSIZE) || (len < 0))
264 continue;
266 if ((fh = fopen (filename, "r")) == NULL)
267 {
268 syslog (LOG_ERR, "Cannot open `%s': %s", filename, strerror (errno));
269 continue;
270 }
272 /*
273 * [11:00] <@tokkee> $ cat /proc/acpi/battery/BAT1/state
274 * [11:00] <@tokkee> present: yes
275 * [11:00] <@tokkee> capacity state: ok
276 * [11:00] <@tokkee> charging state: charging
277 * [11:00] <@tokkee> present rate: 1724 mA
278 * [11:00] <@tokkee> remaining capacity: 4136 mAh
279 * [11:00] <@tokkee> present voltage: 12428 mV
280 */
281 while (fgets (buffer, BUFSIZE, fh) != NULL)
282 {
283 numfields = strsplit (buffer, fields, 8);
285 if (numfields < 3)
286 continue;
288 if ((strcmp (fields[0], "present"))
289 && (strcmp (fields[1], "rate:")))
290 valptr = ¤t;
291 else if ((strcmp (fields[0], "remaining"))
292 && (strcmp (fields[1], "capacity:")))
293 valptr = &charge;
294 else if ((strcmp (fields[0], "present"))
295 && (strcmp (fields[1], "voltage:")))
296 valptr = &voltage;
297 else
298 valptr = NULL;
300 if ((strcmp (fields[0], "charging"))
301 && (strcmp (fields[1], "state:")))
302 {
303 if (strcmp (fields[2], "charging"))
304 charging = 1;
305 else
306 charging = 0;
307 }
309 if (valptr != NULL)
310 {
311 char *endptr;
313 endptr = NULL;
314 errno = 0;
316 *valptr = strtod (fields[2], &endptr) / 1000.0;
318 if ((fields[2] == endptr) || (errno != 0))
319 *valptr = INVALID_VALUE;
320 }
321 }
323 if ((current != INVALID_VALUE) && (charging == 0))
324 current *= -1;
326 if ((current != INVALID_VALUE)
327 || (voltage != INVALID_VALUE)
328 || (charge != INVALID_VALUE))
329 battery_submit (ent->d_name, current, voltage, charge);
331 fclose (fh);
332 }
334 closedir (dh);
335 }
336 #endif /* KERNEL_LINUX */
337 }
338 #else
339 # define battery_read NULL
340 #endif /* BATTERY_HAVE_READ */
342 void module_register (void)
343 {
344 plugin_register (MODULE_NAME, battery_init, battery_read, NULL);
345 plugin_register ("battery_current", NULL, NULL, battery_current_write);
346 plugin_register ("battery_voltage", NULL, NULL, battery_voltage_write);
347 plugin_register ("battery_charge", NULL, NULL, battery_charge_write);
348 }
350 #undef BUFSIZE
351 #undef MODULE_NAME