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 #if BATTERY_HAVE_READ
64 static int battery_pmu_num = 0;
65 static char *battery_pmu_file = "/proc/pmu/battery_%i";
66 #endif
68 static void battery_init (void)
69 {
70 #if BATTERY_HAVE_READ
71 int len;
72 char filename[BUFSIZE];
74 for (battery_pmu_num = 0; ; battery_pmu_num++)
75 {
76 len = snprintf (filename, BUFSIZE, battery_pmu_file, battery_pmu_num);
78 if ((len >= BUFSIZE) || (len < 0))
79 break;
81 if (access (filename, R_OK))
82 break;
83 }
84 #endif
86 return;
87 }
89 static void battery_current_write (char *host, char *inst, char *val)
90 {
91 char filename[BUFSIZE];
92 int len;
94 len = snprintf (filename, BUFSIZE, battery_current_file, inst);
95 if ((len >= BUFSIZE) || (len < 0))
96 return;
98 rrd_update_file (host, filename, val,
99 ds_def_current, ds_num_current);
100 }
102 static void battery_voltage_write (char *host, char *inst, char *val)
103 {
104 char filename[BUFSIZE];
105 int len;
107 len = snprintf (filename, BUFSIZE, battery_voltage_file, inst);
108 if ((len >= BUFSIZE) || (len < 0))
109 return;
111 rrd_update_file (host, filename, val,
112 ds_def_voltage, ds_num_voltage);
113 }
115 static void battery_charge_write (char *host, char *inst, char *val)
116 {
117 char filename[BUFSIZE];
118 int len;
120 len = snprintf (filename, BUFSIZE, battery_charge_file, inst);
121 if ((len >= BUFSIZE) || (len < 0))
122 return;
124 rrd_update_file (host, filename, val,
125 ds_def_charge, ds_num_charge);
126 }
128 #if BATTERY_HAVE_READ
129 static void battery_submit (char *inst, double current, double voltage, double charge)
130 {
131 int len;
132 char buffer[BUFSIZE];
134 if (current != INVALID_VALUE)
135 {
136 len = snprintf (buffer, BUFSIZE, "N:%.3f", current);
138 if ((len > 0) && (len < BUFSIZE))
139 plugin_submit ("battery_current", inst, buffer);
140 }
141 else
142 {
143 plugin_submit ("battery_current", inst, "N:U");
144 }
146 if (voltage != INVALID_VALUE)
147 {
148 len = snprintf (buffer, BUFSIZE, "N:%.3f", voltage);
150 if ((len > 0) && (len < BUFSIZE))
151 plugin_submit ("battery_voltage", inst, buffer);
152 }
153 else
154 {
155 plugin_submit ("battery_voltage", inst, "N:U");
156 }
158 if (charge != INVALID_VALUE)
159 {
160 len = snprintf (buffer, BUFSIZE, "N:%.3f", charge);
162 if ((len > 0) && (len < BUFSIZE))
163 plugin_submit ("battery_charge", inst, buffer);
164 }
165 else
166 {
167 plugin_submit ("battery_charge", inst, "N:U");
168 }
169 }
171 static void battery_read (void)
172 {
173 #ifdef KERNEL_LINUX
174 FILE *fh;
175 char buffer[BUFSIZE];
176 char filename[BUFSIZE];
178 char *fields[8];
179 int numfields;
181 int i;
182 int len;
184 for (i = 0; i < battery_pmu_num; i++)
185 {
186 char batnum_str[BUFSIZE];
187 double current = INVALID_VALUE;
188 double voltage = INVALID_VALUE;
189 double charge = INVALID_VALUE;
190 double *valptr = NULL;
192 len = snprintf (filename, BUFSIZE, battery_pmu_file, i);
193 if ((len >= BUFSIZE) || (len < 0))
194 continue;
196 len = snprintf (batnum_str, BUFSIZE, "%i", i);
197 if ((len >= BUFSIZE) || (len < 0))
198 continue;
200 if ((fh = fopen (filename, "r")) == NULL)
201 continue;
203 while (fgets (buffer, BUFSIZE, fh) != NULL)
204 {
205 numfields = strsplit (buffer, fields, 8);
207 if (numfields < 3)
208 continue;
210 if (strcmp ("current", fields[0]) == 0)
211 valptr = ¤t;
212 else if (strcmp ("voltage", fields[0]) == 0)
213 valptr = &voltage;
214 else if (strcmp ("charge", fields[0]) == 0)
215 valptr = &charge;
216 else
217 valptr = NULL;
219 if (valptr != NULL)
220 {
221 char *endptr;
223 endptr = NULL;
224 errno = 0;
226 *valptr = strtod (fields[2], &endptr) / 1000.0;
228 if ((fields[2] == endptr) || (errno != 0))
229 *valptr = INVALID_VALUE;
230 }
231 }
233 if ((current != INVALID_VALUE)
234 || (voltage != INVALID_VALUE)
235 || (charge != INVALID_VALUE))
236 battery_submit (batnum_str, current, voltage, charge);
238 fclose (fh);
239 fh = NULL;
240 }
242 if (access ("/proc/acpi/battery", R_OK | X_OK) == 0)
243 {
244 double current = INVALID_VALUE;
245 double voltage = INVALID_VALUE;
246 double charge = INVALID_VALUE;
247 double *valptr = NULL;
248 int charging = 0;
250 struct dirent *ent;
251 DIR *dh;
253 if ((dh = opendir ("/proc/acpi/battery")) == NULL)
254 {
255 syslog (LOG_ERR, "Cannot open `/proc/acpi/battery': %s", strerror (errno));
256 return;
257 }
259 while ((ent = readdir (dh)) != NULL)
260 {
261 if (ent->d_name[0] == '.')
262 continue;
264 len = snprintf (filename, BUFSIZE, "/proc/acpi/battery/%s/state", ent->d_name);
265 if ((len >= BUFSIZE) || (len < 0))
266 continue;
268 if ((fh = fopen (filename, "r")) == NULL)
269 {
270 syslog (LOG_ERR, "Cannot open `%s': %s", filename, strerror (errno));
271 continue;
272 }
274 /*
275 * [11:00] <@tokkee> $ cat /proc/acpi/battery/BAT1/state
276 * [11:00] <@tokkee> present: yes
277 * [11:00] <@tokkee> capacity state: ok
278 * [11:00] <@tokkee> charging state: charging
279 * [11:00] <@tokkee> present rate: 1724 mA
280 * [11:00] <@tokkee> remaining capacity: 4136 mAh
281 * [11:00] <@tokkee> present voltage: 12428 mV
282 */
283 while (fgets (buffer, BUFSIZE, fh) != NULL)
284 {
285 numfields = strsplit (buffer, fields, 8);
287 if (numfields < 3)
288 continue;
290 if ((strcmp (fields[0], "present") == 0)
291 && (strcmp (fields[1], "rate:") == 0))
292 valptr = ¤t;
293 else if ((strcmp (fields[0], "remaining") == 0)
294 && (strcmp (fields[1], "capacity:") == 0))
295 valptr = &charge;
296 else if ((strcmp (fields[0], "present") == 0)
297 && (strcmp (fields[1], "voltage:") == 0))
298 valptr = &voltage;
299 else
300 valptr = NULL;
302 if ((strcmp (fields[0], "charging") == 0)
303 && (strcmp (fields[1], "state:") == 0))
304 {
305 if (strcmp (fields[2], "charging") == 0)
306 charging = 1;
307 else
308 charging = 0;
309 }
311 if (valptr != NULL)
312 {
313 char *endptr;
315 endptr = NULL;
316 errno = 0;
318 *valptr = strtod (fields[2], &endptr) / 1000.0;
320 if ((fields[2] == endptr) || (errno != 0))
321 *valptr = INVALID_VALUE;
322 }
323 }
325 if ((current != INVALID_VALUE) && (charging == 0))
326 current *= -1;
328 if ((current != INVALID_VALUE)
329 || (voltage != INVALID_VALUE)
330 || (charge != INVALID_VALUE))
331 battery_submit (ent->d_name, current, voltage, charge);
333 fclose (fh);
334 }
336 closedir (dh);
337 }
338 #endif /* KERNEL_LINUX */
339 }
340 #else
341 # define battery_read NULL
342 #endif /* BATTERY_HAVE_READ */
344 void module_register (void)
345 {
346 plugin_register (MODULE_NAME, battery_init, battery_read, NULL);
347 plugin_register ("battery_current", NULL, NULL, battery_current_write);
348 plugin_register ("battery_voltage", NULL, NULL, battery_voltage_write);
349 plugin_register ("battery_charge", NULL, NULL, battery_charge_write);
350 }
352 #undef BUFSIZE
353 #undef MODULE_NAME