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