src/battery.c

   1 /**
   2  * collectd - src/battery.c
   3  * Copyright (C) 2006-2014  Florian octo Forster
   4  * Copyright (C) 2008       Michał Mirosław
   5  * Copyright (C) 2014       Andy Parkins
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; only version 2 of the License is applicable.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19  *
  20  * Authors:
  21  *   Florian octo Forster <octo at collectd.org>
  22  *   Michał Mirosław <mirq-linux at rere.qmqm.pl>
  23  *   Andy Parkins <andyp at fussylogic.co.uk>
  24  **/
  25
  26 #include "collectd.h"
  27 #include "common.h"
  28 #include "plugin.h"
  29
  30 #if HAVE_MACH_MACH_TYPES_H
  31 #  include <mach/mach_types.h>
  32 #endif
  33 #if HAVE_MACH_MACH_INIT_H
  34 #  include <mach/mach_init.h>
  35 #endif
  36 #if HAVE_MACH_MACH_ERROR_H
  37 #  include <mach/mach_error.h>
  38 #endif
  39 #if HAVE_COREFOUNDATION_COREFOUNDATION_H
  40 #  include <CoreFoundation/CoreFoundation.h>
  41 #endif
  42 #if HAVE_IOKIT_IOKITLIB_H
  43 #  include <IOKit/IOKitLib.h>
  44 #endif
  45 #if HAVE_IOKIT_IOTYPES_H
  46 #  include <IOKit/IOTypes.h>
  47 #endif
  48 #if HAVE_IOKIT_PS_IOPOWERSOURCES_H
  49 #  include <IOKit/ps/IOPowerSources.h>
  50 #endif
  51 #if HAVE_IOKIT_PS_IOPSKEYS_H
  52 #  include <IOKit/ps/IOPSKeys.h>
  53 #endif
  54
  55 #if !HAVE_IOKIT_IOKITLIB_H && !HAVE_IOKIT_PS_IOPOWERSOURCES_H && !KERNEL_LINUX
  56 # error "No applicable input method."
  57 #endif
  58
  59 #if HAVE_IOKIT_IOKITLIB_H || HAVE_IOKIT_PS_IOPOWERSOURCES_H
  60         /* No global variables */
  61 /* #endif HAVE_IOKIT_IOKITLIB_H || HAVE_IOKIT_PS_IOPOWERSOURCES_H */
  62
  63 #elif KERNEL_LINUX
  64 # define PROC_PMU_PATH_FORMAT "/proc/pmu/battery_%i"
  65 # define PROC_ACPI_PATH "/proc/acpi/battery"
  66 # define PROC_ACPI_FACTOR 0.001
  67 # define SYSFS_PATH "/sys/class/power_supply"
  68 # define SYSFS_FACTOR 0.000001
  69 #endif /* KERNEL_LINUX */
  70
  71 static _Bool report_percent = 0;
  72 static _Bool report_degraded = 0;
  73
  74 static void battery_submit2 (char const *plugin_instance, /* {{{ */
  75                 char const *type, char const *type_instance, gauge_t value)
  76 {
  77         value_t values[1];
  78         value_list_t vl = VALUE_LIST_INIT;
  79
  80         values[0].gauge = value;
  81
  82         vl.values = values;
  83         vl.values_len = 1;
  84         sstrncpy (vl.host, hostname_g, sizeof (vl.host));
  85         sstrncpy (vl.plugin, "battery", sizeof (vl.plugin));
  86         sstrncpy (vl.plugin_instance, plugin_instance, sizeof (vl.plugin_instance));
  87         sstrncpy (vl.type, type, sizeof (vl.type));
  88         if (type_instance != NULL)
  89                 sstrncpy (vl.type_instance, type_instance, sizeof (vl.type_instance));
  90
  91         plugin_dispatch_values (&vl);
  92 } /* }}} void battery_submit2 */
  93
  94 static void battery_submit (char const *plugin_instance, /* {{{ */
  95                 char const *type, gauge_t value)
  96 {
  97         battery_submit2 (plugin_instance, type, NULL, value);
  98 } /* }}} void battery_submit */
  99
 100 static void submit_capacity (char const *plugin_instance, /* {{{ */
 101                 gauge_t capacity_charged,
 102                 gauge_t capacity_full,
 103                 gauge_t capacity_design)
 104 {
 105         if (report_percent && (capacity_charged > capacity_full))
 106                 return;
 107         if (report_degraded && (capacity_full > capacity_design))
 108                 return;
 109
 110         if (report_percent)
 111         {
 112                 gauge_t capacity_max;
 113
 114                 if (report_degraded)
 115                         capacity_max = capacity_design;
 116                 else
 117                         capacity_max = capacity_full;
 118
 119                 battery_submit2 (plugin_instance, "percent", "charged",
 120                                 100.0 * capacity_charged / capacity_max);
 121                 battery_submit2 (plugin_instance, "percent", "discharged",
 122                                 100.0 * (capacity_full - capacity_charged) / capacity_max);
 123
 124                 if (report_degraded)
 125                         battery_submit2 (plugin_instance, "percent", "degraded",
 126                                         100.0 * (capacity_design - capacity_full) / capacity_max);
 127         }
 128         else if (report_degraded) /* && !report_percent */
 129         {
 130                 battery_submit2 (plugin_instance, "capacity", "charged",
 131                                 capacity_charged);
 132                 battery_submit2 (plugin_instance, "capacity", "discharged",
 133                                 (capacity_full - capacity_charged));
 134                 battery_submit2 (plugin_instance, "capacity", "degraded",
 135                                 (capacity_design - capacity_full));
 136         }
 137         else /* !report_percent && !report_degraded */
 138         {
 139                 battery_submit (plugin_instance, "capacity", capacity_charged);
 140         }
 141 } /* }}} void submit_capacity */
 142
 143 #if HAVE_IOKIT_PS_IOPOWERSOURCES_H || HAVE_IOKIT_IOKITLIB_H
 144 static double dict_get_double (CFDictionaryRef dict, const char *key_string) /* {{{ */
 145 {
 146         double      val_double;
 147         long long   val_int;
 148         CFNumberRef val_obj;
 149         CFStringRef key_obj;
 150
 151         key_obj = CFStringCreateWithCString (kCFAllocatorDefault, key_string,
 152                         kCFStringEncodingASCII);
 153         if (key_obj == NULL)
 154         {
 155                 DEBUG ("CFStringCreateWithCString (%s) failed.\n", key_string);
 156                 return (NAN);
 157         }
 158
 159         if ((val_obj = CFDictionaryGetValue (dict, key_obj)) == NULL)
 160         {
 161                 DEBUG ("CFDictionaryGetValue (%s) failed.", key_string);
 162                 CFRelease (key_obj);
 163                 return (NAN);
 164         }
 165         CFRelease (key_obj);
 166
 167         if (CFGetTypeID (val_obj) == CFNumberGetTypeID ())
 168         {
 169                 if (CFNumberIsFloatType (val_obj))
 170                 {
 171                         CFNumberGetValue (val_obj,
 172                                         kCFNumberDoubleType,
 173                                         &val_double);
 174                 }
 175                 else
 176                 {
 177                         CFNumberGetValue (val_obj,
 178                                         kCFNumberLongLongType,
 179                                         &val_int);
 180                         val_double = val_int;
 181                 }
 182         }
 183         else
 184         {
 185                 DEBUG ("CFGetTypeID (val_obj) = %i", (int) CFGetTypeID (val_obj));
 186                 return (NAN);
 187         }
 188
 189         return (val_double);
 190 } /* }}} double dict_get_double */
 191
 192 # if HAVE_IOKIT_PS_IOPOWERSOURCES_H
 193 static void get_via_io_power_sources (double *ret_charge, /* {{{ */
 194                 double *ret_current,
 195                 double *ret_voltage)
 196 {
 197         CFTypeRef       ps_raw;
 198         CFArrayRef      ps_array;
 199         int             ps_array_len;
 200         CFDictionaryRef ps_dict;
 201         CFTypeRef       ps_obj;
 202
 203         double temp_double;
 204         int i;
 205
 206         ps_raw       = IOPSCopyPowerSourcesInfo ();
 207         ps_array     = IOPSCopyPowerSourcesList (ps_raw);
 208         ps_array_len = CFArrayGetCount (ps_array);
 209
 210         DEBUG ("ps_array_len == %i", ps_array_len);
 211
 212         for (i = 0; i < ps_array_len; i++)
 213         {
 214                 ps_obj  = CFArrayGetValueAtIndex (ps_array, i);
 215                 ps_dict = IOPSGetPowerSourceDescription (ps_raw, ps_obj);
 216
 217                 if (ps_dict == NULL)
 218                 {
 219                         DEBUG ("IOPSGetPowerSourceDescription failed.");
 220                         continue;
 221                 }
 222
 223                 if (CFGetTypeID (ps_dict) != CFDictionaryGetTypeID ())
 224                 {
 225                         DEBUG ("IOPSGetPowerSourceDescription did not return a CFDictionaryRef");
 226                         continue;
 227                 }
 228
 229                 /* FIXME: Check if this is really an internal battery */
 230
 231                 if (isnan (*ret_charge))
 232                 {
 233                         /* This is the charge in percent. */
 234                         temp_double = dict_get_double (ps_dict,
 235                                         kIOPSCurrentCapacityKey);
 236                         if (!isnan ((temp_double))
 237                                         && (temp_double >= 0.0)
 238                                         && (temp_double <= 100.0))
 239                                 *ret_charge = temp_double;
 240                 }
 241
 242                 if (isnan (*ret_current))
 243                 {
 244                         temp_double = dict_get_double (ps_dict,
 245                                         kIOPSCurrentKey);
 246                         if (!isnan (temp_double))
 247                                 *ret_current = temp_double / 1000.0;
 248                 }
 249
 250                 if (isnan (*ret_voltage))
 251                 {
 252                         temp_double = dict_get_double (ps_dict,
 253                                         kIOPSVoltageKey);
 254                         if (!isnan (temp_double))
 255                                 *ret_voltage = temp_double / 1000.0;
 256                 }
 257         }
 258
 259         CFRelease(ps_array);
 260         CFRelease(ps_raw);
 261 } /* }}} void get_via_io_power_sources */
 262 # endif /* HAVE_IOKIT_PS_IOPOWERSOURCES_H */
 263
 264 # if HAVE_IOKIT_IOKITLIB_H
 265 static void get_via_generic_iokit (double *ret_capacity_full, /* {{{ */
 266                 double *ret_capacity_design,
 267                 double *ret_current,
 268                 double *ret_voltage)
 269 {
 270         kern_return_t   status;
 271         io_iterator_t   iterator;
 272         io_object_t     io_obj;
 273
 274         CFDictionaryRef bat_root_dict;
 275         CFArrayRef      bat_info_arry;
 276         CFIndex         bat_info_arry_len;
 277         CFIndex         bat_info_arry_pos;
 278         CFDictionaryRef bat_info_dict;
 279
 280         double temp_double;
 281
 282         status = IOServiceGetMatchingServices (kIOMasterPortDefault,
 283                         IOServiceNameMatching ("battery"),
 284                         &iterator);
 285         if (status != kIOReturnSuccess)
 286         {
 287                 DEBUG ("IOServiceGetMatchingServices failed.");
 288                 return;
 289         }
 290
 291         while ((io_obj = IOIteratorNext (iterator)))
 292         {
 293                 status = IORegistryEntryCreateCFProperties (io_obj,
 294                                 (CFMutableDictionaryRef *) &bat_root_dict,
 295                                 kCFAllocatorDefault,
 296                                 kNilOptions);
 297                 if (status != kIOReturnSuccess)
 298                 {
 299                         DEBUG ("IORegistryEntryCreateCFProperties failed.");
 300                         continue;
 301                 }
 302
 303                 bat_info_arry = (CFArrayRef) CFDictionaryGetValue (bat_root_dict,
 304                                 CFSTR ("IOBatteryInfo"));
 305                 if (bat_info_arry == NULL)
 306                 {
 307                         CFRelease (bat_root_dict);
 308                         continue;
 309                 }
 310                 bat_info_arry_len = CFArrayGetCount (bat_info_arry);
 311
 312                 for (bat_info_arry_pos = 0;
 313                                 bat_info_arry_pos < bat_info_arry_len;
 314                                 bat_info_arry_pos++)
 315                 {
 316                         bat_info_dict = (CFDictionaryRef) CFArrayGetValueAtIndex (bat_info_arry, bat_info_arry_pos);
 317
 318                         if (isnan (*ret_capacity_full))
 319                         {
 320                                 temp_double = dict_get_double (bat_info_dict, "Capacity");
 321                                 *ret_capacity_full = temp_double / 1000.0;
 322                         }
 323
 324                         if (isnan (*ret_capacity_design))
 325                         {
 326                                 temp_double = dict_get_double (bat_info_dict, "AbsoluteMaxCapacity");
 327                                 *ret_capacity_design = temp_double / 1000.0;
 328                         }
 329
 330                         if (isnan (*ret_current))
 331                         {
 332                                 temp_double = dict_get_double (bat_info_dict, "Current");
 333                                 *ret_current = temp_double / 1000.0;
 334                         }
 335
 336                         if (isnan (*ret_voltage))
 337                         {
 338                                 temp_double = dict_get_double (bat_info_dict, "Voltage");
 339                                 *ret_voltage = temp_double / 1000.0;
 340                         }
 341                 }
 342
 343                 CFRelease (bat_root_dict);
 344         }
 345
 346         IOObjectRelease (iterator);
 347 } /* }}} void get_via_generic_iokit */
 348 # endif /* HAVE_IOKIT_IOKITLIB_H */
 349
 350 static int battery_read (void) /* {{{ */
 351 {
 352         gauge_t current = NAN; /* Current in A */
 353         gauge_t voltage = NAN; /* Voltage in V */
 354
 355         /* We only get the charged capacity as a percentage from
 356          * IOPowerSources. IOKit, on the other hand, only reports the full
 357          * capacity. We use the two to calculate the current charged capacity. */
 358         gauge_t charge_rel = NAN; /* Current charge in percent */
 359         gauge_t capacity_charged; /* Charged capacity */
 360         gauge_t capacity_full = NAN; /* Total capacity */
 361         gauge_t capacity_design = NAN; /* Full design capacity */
 362
 363 #if HAVE_IOKIT_PS_IOPOWERSOURCES_H
 364         get_via_io_power_sources (&charge_rel, &current, &voltage);
 365 #endif
 366 #if HAVE_IOKIT_IOKITLIB_H
 367         get_via_generic_iokit (&capacity_full, &capacity_design, &current, &voltage);
 368 #endif
 369
 370         capacity_charged = charge_rel * capacity_full / 100.0;
 371         submit_capacity ("0", capacity_charged, capacity_full, capacity_design);
 372
 373         if (!isnan (current))
 374                 battery_submit ("0", "current", current);
 375         if (!isnan (voltage))
 376                 battery_submit ("0", "voltage", voltage);
 377
 378         return (0);
 379 } /* }}} int battery_read */
 380 /* #endif HAVE_IOKIT_IOKITLIB_H || HAVE_IOKIT_PS_IOPOWERSOURCES_H */
 381
 382 #elif KERNEL_LINUX
 383 /* Reads a file which contains only a number (and optionally a trailing
 384  * newline) and parses that number. */
 385 static int sysfs_file_to_buffer(char const *dir, /* {{{ */
 386                 char const *power_supply,
 387                 char const *basename,
 388                 char *buffer, size_t buffer_size)
 389 {
 390         int status;
 391         FILE *fp;
 392         char filename[PATH_MAX];
 393
 394         ssnprintf (filename, sizeof (filename), "%s/%s/%s",
 395                         dir, power_supply, basename);
 396
 397         /* No file isn't the end of the world -- not every system will be
 398          * reporting the same set of statistics */
 399         if (access (filename, R_OK) != 0)
 400                 return ENOENT;
 401
 402         fp = fopen (filename, "r");
 403         if (fp == NULL)
 404         {
 405                 status = errno;
 406                 if (status != ENOENT)
 407                 {
 408                         char errbuf[1024];
 409                         WARNING ("battery plugin: fopen (%s) failed: %s", filename,
 410                                         sstrerror (status, errbuf, sizeof (errbuf)));
 411                 }
 412                 return status;
 413         }
 414
 415         if (fgets (buffer, buffer_size, fp) == NULL)
 416         {
 417                 status = errno;
 418                 if (status != ENODEV)
 419                 {
 420                         char errbuf[1024];
 421                         WARNING ("battery plugin: fgets (%s) failed: %s", filename,
 422                                         sstrerror (status, errbuf, sizeof (errbuf)));
 423                 }
 424                 fclose (fp);
 425                 return status;
 426         }
 427
 428         strstripnewline (buffer);
 429
 430         fclose (fp);
 431         return 0;
 432 } /* }}} int sysfs_file_to_buffer */
 433
 434 /* Reads a file which contains only a number (and optionally a trailing
 435  * newline) and parses that number. */
 436 static int sysfs_file_to_gauge(char const *dir, /* {{{ */
 437                 char const *power_supply,
 438                 char const *basename, gauge_t *ret_value)
 439 {
 440         int status;
 441         char buffer[32] = "";
 442
 443         status = sysfs_file_to_buffer (dir, power_supply, basename, buffer, sizeof (buffer));
 444         if (status != 0)
 445                 return (status);
 446
 447         return (strtogauge (buffer, ret_value));
 448 } /* }}} sysfs_file_to_gauge */
 449
 450 static int read_sysfs_capacity (char const *dir, /* {{{ */
 451                 char const *power_supply,
 452                 char const *plugin_instance)
 453 {
 454         gauge_t capacity_charged = NAN;
 455         gauge_t capacity_full = NAN;
 456         gauge_t capacity_design = NAN;
 457         int status;
 458
 459         status = sysfs_file_to_gauge (dir, power_supply, "energy_now", &capacity_charged);
 460         if (status != 0)
 461                 return (status);
 462
 463         status = sysfs_file_to_gauge (dir, power_supply, "energy_full", &capacity_full);
 464         if (status != 0)
 465                 return (status);
 466
 467         status = sysfs_file_to_gauge (dir, power_supply, "energy_full_design", &capacity_design);
 468         if (status != 0)
 469                 return (status);
 470
 471         submit_capacity (plugin_instance,
 472                         capacity_charged * SYSFS_FACTOR,
 473                         capacity_full * SYSFS_FACTOR,
 474                         capacity_design * SYSFS_FACTOR);
 475         return (0);
 476 } /* }}} int read_sysfs_capacity */
 477
 478 static int read_sysfs_callback (char const *dir, /* {{{ */
 479                 char const *power_supply,
 480                 void *user_data)
 481 {
 482         int *battery_index = user_data;
 483
 484         char const *plugin_instance;
 485         char buffer[32];
 486         gauge_t v = NAN;
 487         _Bool discharging = 0;
 488         int status;
 489
 490         /* Ignore non-battery directories, such as AC power. */
 491         status = sysfs_file_to_buffer (dir, power_supply, "type", buffer, sizeof (buffer));
 492         if (status != 0)
 493                 return (0);
 494         if (strcasecmp ("Battery", buffer) != 0)
 495                 return (0);
 496
 497         (void) sysfs_file_to_buffer (dir, power_supply, "status", buffer, sizeof (buffer));
 498         if (strcasecmp ("Discharging", buffer) == 0)
 499                 discharging = 1;
 500
 501         /* FIXME: This is a dirty hack for backwards compatibility: The battery
 502          * plugin, for a very long time, has had the plugin_instance
 503          * hard-coded to "0". So, to keep backwards compatibility, we'll use
 504          * "0" for the first battery we find and the power_supply name for all
 505          * following. This should be reverted in a future major version. */
 506         plugin_instance = (*battery_index == 0) ? "0" : power_supply;
 507         (*battery_index)++;
 508
 509         read_sysfs_capacity (dir, power_supply, plugin_instance);
 510
 511         if (sysfs_file_to_gauge (dir, power_supply, "power_now", &v) == 0)
 512         {
 513                 if (discharging)
 514                         v *= -1.0;
 515                 battery_submit (plugin_instance, "power", v * SYSFS_FACTOR);
 516         }
 517         if (sysfs_file_to_gauge (dir, power_supply, "current_now", &v) == 0)
 518         {
 519                 if (discharging)
 520                         v *= -1.0;
 521                 battery_submit (plugin_instance, "current", v * SYSFS_FACTOR);
 522         }
 523
 524         if (sysfs_file_to_gauge (dir, power_supply, "voltage_now", &v) == 0)
 525                 battery_submit (plugin_instance, "voltage", v * SYSFS_FACTOR);
 526
 527         return (0);
 528 } /* }}} int read_sysfs_callback */
 529
 530 static int read_sysfs (void) /* {{{ */
 531 {
 532         int status;
 533         int battery_counter = 0;
 534
 535         if (access (SYSFS_PATH, R_OK) != 0)
 536                 return (ENOENT);
 537
 538         status = walk_directory (SYSFS_PATH, read_sysfs_callback,
 539                         /* user_data = */ &battery_counter,
 540                         /* include hidden */ 0);
 541         return (status);
 542 } /* }}} int read_sysfs */
 543
 544 static int read_acpi_full_capacity (char const *dir, /* {{{ */
 545                 char const *power_supply,
 546                 gauge_t *ret_capacity_full,
 547                 gauge_t *ret_capacity_design)
 548
 549 {
 550         char filename[PATH_MAX];
 551         char buffer[1024];
 552
 553         FILE *fh;
 554
 555         ssnprintf (filename, sizeof (filename), "%s/%s/info", dir, power_supply);
 556         fh = fopen (filename, "r");
 557         if (fh == NULL)
 558                 return (errno);
 559
 560         /* last full capacity:      40090 mWh */
 561         while (fgets (buffer, sizeof (buffer), fh) != NULL)
 562         {
 563                 gauge_t *value_ptr;
 564                 int fields_num;
 565                 char *fields[8];
 566                 int index;
 567
 568                 if (strncmp ("last full capacity:", buffer, strlen ("last full capacity:")) == 0)
 569                 {
 570                         value_ptr = ret_capacity_full;
 571                         index = 3;
 572                 }
 573                 else if (strncmp ("design capacity:", buffer, strlen ("design capacity:")) == 0)
 574                 {
 575                         value_ptr = ret_capacity_design;
 576                         index = 2;
 577                 }
 578                 else
 579                 {
 580                         continue;
 581                 }
 582
 583                 fields_num = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
 584                 if (fields_num <= index)
 585                         continue;
 586
 587                 strtogauge (fields[index], value_ptr);
 588         }
 589
 590         fclose (fh);
 591         return (0);
 592 } /* }}} int read_acpi_full_capacity */
 593
 594 static int read_acpi_callback (char const *dir, /* {{{ */
 595                 char const *power_supply,
 596                 void *user_data)
 597 {
 598         int *battery_index = user_data;
 599
 600         gauge_t power = NAN;
 601         gauge_t voltage = NAN;
 602         gauge_t capacity_charged = NAN;
 603         gauge_t capacity_full = NAN;
 604         gauge_t capacity_design = NAN;
 605         _Bool charging = 0;
 606         _Bool is_current = 0;
 607
 608         char const *plugin_instance;
 609         char filename[PATH_MAX];
 610         char buffer[1024];
 611
 612         FILE *fh;
 613
 614         ssnprintf (filename, sizeof (filename), "%s/%s/state", dir, power_supply);
 615         fh = fopen (filename, "r");
 616         if (fh == NULL)
 617         {
 618                 if ((errno == EAGAIN) || (errno == EINTR) || (errno == ENOENT))
 619                         return (0);
 620                 else
 621                         return (errno);
 622         }
 623
 624         /*
 625          * [11:00] <@tokkee> $ cat /proc/acpi/battery/BAT1/state
 626          * [11:00] <@tokkee> present:                 yes
 627          * [11:00] <@tokkee> capacity state:          ok
 628          * [11:00] <@tokkee> charging state:          charging
 629          * [11:00] <@tokkee> present rate:            1724 mA
 630          * [11:00] <@tokkee> remaining capacity:      4136 mAh
 631          * [11:00] <@tokkee> present voltage:         12428 mV
 632          */
 633         while (fgets (buffer, sizeof (buffer), fh) != NULL)
 634         {
 635                 char *fields[8];
 636                 int numfields;
 637
 638                 numfields = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
 639                 if (numfields < 3)
 640                         continue;
 641
 642                 if ((strcmp (fields[0], "charging") == 0)
 643                                 && (strcmp (fields[1], "state:") == 0))
 644                 {
 645                         if (strcmp (fields[2], "charging") == 0)
 646                                 charging = 1;
 647                         else
 648                                 charging = 0;
 649                         continue;
 650                 }
 651
 652                 /* The unit of "present rate" depends on the battery. Modern
 653                  * batteries export power (watts), older batteries (used to)
 654                  * export current (amperes). We check the fourth column and try
 655                  * to find old batteries this way. */
 656                 if ((strcmp (fields[0], "present") == 0)
 657                                 && (strcmp (fields[1], "rate:") == 0))
 658                 {
 659                         strtogauge (fields[2], &power);
 660
 661                         if ((numfields >= 4) && (strcmp ("mA", fields[3]) == 0))
 662                                 is_current = 1;
 663                 }
 664                 else if ((strcmp (fields[0], "remaining") == 0)
 665                                 && (strcmp (fields[1], "capacity:") == 0))
 666                         strtogauge (fields[2], &capacity_charged);
 667                 else if ((strcmp (fields[0], "present") == 0)
 668                                 && (strcmp (fields[1], "voltage:") == 0))
 669                         strtogauge (fields[2], &voltage);
 670         } /* while (fgets (buffer, sizeof (buffer), fh) != NULL) */
 671
 672         fclose (fh);
 673
 674         if (!charging)
 675                 power *= -1.0;
 676
 677         /* FIXME: This is a dirty hack for backwards compatibility: The battery
 678          * plugin, for a very long time, has had the plugin_instance
 679          * hard-coded to "0". So, to keep backwards compatibility, we'll use
 680          * "0" for the first battery we find and the power_supply name for all
 681          * following. This should be reverted in a future major version. */
 682         plugin_instance = (*battery_index == 0) ? "0" : power_supply;
 683         (*battery_index)++;
 684
 685         read_acpi_full_capacity (dir, power_supply, &capacity_full, &capacity_design);
 686
 687         submit_capacity (plugin_instance,
 688                         capacity_charged * PROC_ACPI_FACTOR,
 689                         capacity_full * PROC_ACPI_FACTOR,
 690                         capacity_design * PROC_ACPI_FACTOR);
 691
 692         battery_submit (plugin_instance,
 693                         is_current ? "current" : "power",
 694                         power * PROC_ACPI_FACTOR);
 695         battery_submit (plugin_instance, "voltage", voltage * PROC_ACPI_FACTOR);
 696
 697         return 0;
 698 } /* }}} int read_acpi_callback */
 699
 700 static int read_acpi (void) /* {{{ */
 701 {
 702         int status;
 703         int battery_counter = 0;
 704
 705         if (access (PROC_ACPI_PATH, R_OK) != 0)
 706                 return (ENOENT);
 707
 708         status = walk_directory (PROC_ACPI_PATH, read_acpi_callback,
 709                         /* user_data = */ &battery_counter,
 710                         /* include hidden */ 0);
 711         return (status);
 712 } /* }}} int read_acpi */
 713
 714 static int read_pmu (void) /* {{{ */
 715 {
 716         int i;
 717
 718         /* The upper limit here is just a safeguard. If there is a system with
 719          * more than 100 batteries, this can easily be increased. */
 720         for (i = 0; i < 100; i++)
 721         {
 722                 FILE *fh;
 723
 724                 char buffer[1024];
 725                 char filename[PATH_MAX];
 726                 char plugin_instance[DATA_MAX_NAME_LEN];
 727
 728                 gauge_t current = NAN;
 729                 gauge_t voltage = NAN;
 730                 gauge_t charge  = NAN;
 731
 732                 ssnprintf (filename, sizeof (filename), PROC_PMU_PATH_FORMAT, i);
 733                 if (access (filename, R_OK) != 0)
 734                         break;
 735
 736                 ssnprintf (plugin_instance, sizeof (plugin_instance), "%i", i);
 737
 738                 fh = fopen (filename, "r");
 739                 if (fh == NULL)
 740                 {
 741                         if (errno == ENOENT)
 742                                 break;
 743                         else if ((errno == EAGAIN) || (errno == EINTR))
 744                                 continue;
 745                         else
 746                                 return (errno);
 747                 }
 748
 749                 while (fgets (buffer, sizeof (buffer), fh) != NULL)
 750                 {
 751                         char *fields[8];
 752                         int numfields;
 753
 754                         numfields = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
 755                         if (numfields < 3)
 756                                 continue;
 757
 758                         if (strcmp ("current", fields[0]) == 0)
 759                                 strtogauge (fields[2], &current);
 760                         else if (strcmp ("voltage", fields[0]) == 0)
 761                                 strtogauge (fields[2], &voltage);
 762                         else if (strcmp ("charge", fields[0]) == 0)
 763                                 strtogauge (fields[2], &charge);
 764                 }
 765
 766                 fclose (fh);
 767                 fh = NULL;
 768
 769                 battery_submit (plugin_instance, "charge", charge / 1000.0);
 770                 battery_submit (plugin_instance, "current", current / 1000.0);
 771                 battery_submit (plugin_instance, "voltage", voltage / 1000.0);
 772         }
 773
 774         if (i == 0)
 775                 return (ENOENT);
 776         return (0);
 777 } /* }}} int read_pmu */
 778
 779 static int battery_read (void) /* {{{ */
 780 {
 781         int status;
 782
 783         DEBUG ("battery plugin: Trying sysfs ...");
 784         status = read_sysfs ();
 785         if (status == 0)
 786                 return (0);
 787
 788         DEBUG ("battery plugin: Trying acpi ...");
 789         status = read_acpi ();
 790         if (status == 0)
 791                 return (0);
 792
 793         DEBUG ("battery plugin: Trying pmu ...");
 794         status = read_pmu ();
 795         if (status == 0)
 796                 return (0);
 797
 798         ERROR ("battery plugin: Add available input methods failed.");
 799         return (-1);
 800 } /* }}} int battery_read */
 801 #endif /* KERNEL_LINUX */
 802
 803 static int battery_config (oconfig_item_t *ci)
 804 {
 805         int i;
 806
 807         for (i = 0; i < ci->children_num; i++)
 808         {
 809                 oconfig_item_t *child = ci->children + i;
 810
 811                 if (strcasecmp ("ValuesPercentage", child->key) == 0)
 812                         cf_util_get_boolean (child, &report_percent);
 813                 else if (strcasecmp ("ReportDegraded", child->key) == 0)
 814                         cf_util_get_boolean (child, &report_degraded);
 815                 else
 816                         WARNING ("battery plugin: Ignoring unknown "
 817                                         "configuration option \"%s\".",
 818                                         child->key);
 819         }
 820
 821         return (0);
 822 } /* }}} int battery_config */
 823
 824 void module_register (void)
 825 {
 826         plugin_register_complex_config ("battery", battery_config);
 827         plugin_register_read ("battery", battery_read);
 828 } /* void module_register */