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 int battery_read_statefs (void); /* defined in battery_statefs; used by StateFS backend */
  73
  74 static _Bool report_percent = 0;
  75 static _Bool report_degraded = 0;
  76 static _Bool query_statefs = 0;
  77
  78 static void battery_submit2 (char const *plugin_instance, /* {{{ */
  79                 char const *type, char const *type_instance, gauge_t value)
  80 {
  81         value_list_t vl = VALUE_LIST_INIT;
  82
  83         vl.values = &(value_t) { .gauge = value };
  84         vl.values_len = 1;
  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
 205         ps_raw       = IOPSCopyPowerSourcesInfo ();
 206         ps_array     = IOPSCopyPowerSourcesList (ps_raw);
 207         ps_array_len = CFArrayGetCount (ps_array);
 208
 209         DEBUG ("ps_array_len == %i", ps_array_len);
 210
 211         for (int i = 0; i < ps_array_len; i++)
 212         {
 213                 ps_obj  = CFArrayGetValueAtIndex (ps_array, i);
 214                 ps_dict = IOPSGetPowerSourceDescription (ps_raw, ps_obj);
 215
 216                 if (ps_dict == NULL)
 217                 {
 218                         DEBUG ("IOPSGetPowerSourceDescription failed.");
 219                         continue;
 220                 }
 221
 222                 if (CFGetTypeID (ps_dict) != CFDictionaryGetTypeID ())
 223                 {
 224                         DEBUG ("IOPSGetPowerSourceDescription did not return a CFDictionaryRef");
 225                         continue;
 226                 }
 227
 228                 /* FIXME: Check if this is really an internal battery */
 229
 230                 if (isnan (*ret_charge))
 231                 {
 232                         /* This is the charge in percent. */
 233                         temp_double = dict_get_double (ps_dict,
 234                                         kIOPSCurrentCapacityKey);
 235                         if (!isnan ((temp_double))
 236                                         && (temp_double >= 0.0)
 237                                         && (temp_double <= 100.0))
 238                                 *ret_charge = temp_double;
 239                 }
 240
 241                 if (isnan (*ret_current))
 242                 {
 243                         temp_double = dict_get_double (ps_dict,
 244                                         kIOPSCurrentKey);
 245                         if (!isnan (temp_double))
 246                                 *ret_current = temp_double / 1000.0;
 247                 }
 248
 249                 if (isnan (*ret_voltage))
 250                 {
 251                         temp_double = dict_get_double (ps_dict,
 252                                         kIOPSVoltageKey);
 253                         if (!isnan (temp_double))
 254                                 *ret_voltage = temp_double / 1000.0;
 255                 }
 256         }
 257
 258         CFRelease(ps_array);
 259         CFRelease(ps_raw);
 260 } /* }}} void get_via_io_power_sources */
 261 # endif /* HAVE_IOKIT_PS_IOPOWERSOURCES_H */
 262
 263 # if HAVE_IOKIT_IOKITLIB_H
 264 static void get_via_generic_iokit (double *ret_capacity_full, /* {{{ */
 265                 double *ret_capacity_design,
 266                 double *ret_current,
 267                 double *ret_voltage)
 268 {
 269         kern_return_t   status;
 270         io_iterator_t   iterator;
 271         io_object_t     io_obj;
 272
 273         CFDictionaryRef bat_root_dict;
 274         CFArrayRef      bat_info_arry;
 275         CFIndex         bat_info_arry_len;
 276         CFDictionaryRef bat_info_dict;
 277
 278         double temp_double;
 279
 280         status = IOServiceGetMatchingServices (kIOMasterPortDefault,
 281                         IOServiceNameMatching ("battery"),
 282                         &iterator);
 283         if (status != kIOReturnSuccess)
 284         {
 285                 DEBUG ("IOServiceGetMatchingServices failed.");
 286                 return;
 287         }
 288
 289         while ((io_obj = IOIteratorNext (iterator)))
 290         {
 291                 status = IORegistryEntryCreateCFProperties (io_obj,
 292                                 (CFMutableDictionaryRef *) &bat_root_dict,
 293                                 kCFAllocatorDefault,
 294                                 kNilOptions);
 295                 if (status != kIOReturnSuccess)
 296                 {
 297                         DEBUG ("IORegistryEntryCreateCFProperties failed.");
 298                         continue;
 299                 }
 300
 301                 bat_info_arry = (CFArrayRef) CFDictionaryGetValue (bat_root_dict,
 302                                 CFSTR ("IOBatteryInfo"));
 303                 if (bat_info_arry == NULL)
 304                 {
 305                         CFRelease (bat_root_dict);
 306                         continue;
 307                 }
 308                 bat_info_arry_len = CFArrayGetCount (bat_info_arry);
 309
 310                 for (CFIndex bat_info_arry_pos = 0;
 311                                 bat_info_arry_pos < bat_info_arry_len;
 312                                 bat_info_arry_pos++)
 313                 {
 314                         bat_info_dict = (CFDictionaryRef) CFArrayGetValueAtIndex (bat_info_arry, bat_info_arry_pos);
 315
 316                         if (isnan (*ret_capacity_full))
 317                         {
 318                                 temp_double = dict_get_double (bat_info_dict, "Capacity");
 319                                 *ret_capacity_full = temp_double / 1000.0;
 320                         }
 321
 322                         if (isnan (*ret_capacity_design))
 323                         {
 324                                 temp_double = dict_get_double (bat_info_dict, "AbsoluteMaxCapacity");
 325                                 *ret_capacity_design = temp_double / 1000.0;
 326                         }
 327
 328                         if (isnan (*ret_current))
 329                         {
 330                                 temp_double = dict_get_double (bat_info_dict, "Current");
 331                                 *ret_current = temp_double / 1000.0;
 332                         }
 333
 334                         if (isnan (*ret_voltage))
 335                         {
 336                                 temp_double = dict_get_double (bat_info_dict, "Voltage");
 337                                 *ret_voltage = temp_double / 1000.0;
 338                         }
 339                 }
 340
 341                 CFRelease (bat_root_dict);
 342         }
 343
 344         IOObjectRelease (iterator);
 345 } /* }}} void get_via_generic_iokit */
 346 # endif /* HAVE_IOKIT_IOKITLIB_H */
 347
 348 static int battery_read (void) /* {{{ */
 349 {
 350         gauge_t current = NAN; /* Current in A */
 351         gauge_t voltage = NAN; /* Voltage in V */
 352
 353         /* We only get the charged capacity as a percentage from
 354          * IOPowerSources. IOKit, on the other hand, only reports the full
 355          * capacity. We use the two to calculate the current charged capacity. */
 356         gauge_t charge_rel = NAN; /* Current charge in percent */
 357         gauge_t capacity_charged; /* Charged capacity */
 358         gauge_t capacity_full = NAN; /* Total capacity */
 359         gauge_t capacity_design = NAN; /* Full design capacity */
 360
 361         if (query_statefs)
 362                 return battery_read_statefs ();
 363
 364 #if HAVE_IOKIT_PS_IOPOWERSOURCES_H
 365         get_via_io_power_sources (&charge_rel, &current, &voltage);
 366 #endif
 367 #if HAVE_IOKIT_IOKITLIB_H
 368         get_via_generic_iokit (&capacity_full, &capacity_design, &current, &voltage);
 369 #endif
 370
 371         capacity_charged = charge_rel * capacity_full / 100.0;
 372         submit_capacity ("0", capacity_charged, capacity_full, capacity_design);
 373
 374         if (!isnan (current))
 375                 battery_submit ("0", "current", current);
 376         if (!isnan (voltage))
 377                 battery_submit ("0", "voltage", voltage);
 378
 379         return (0);
 380 } /* }}} int battery_read */
 381 /* #endif HAVE_IOKIT_IOKITLIB_H || HAVE_IOKIT_PS_IOPOWERSOURCES_H */
 382
 383 #elif KERNEL_LINUX
 384 /* Reads a file which contains only a number (and optionally a trailing
 385  * newline) and parses that number. */
 386 static int sysfs_file_to_buffer(char const *dir, /* {{{ */
 387                 char const *power_supply,
 388                 char const *basename,
 389                 char *buffer, size_t buffer_size)
 390 {
 391         char filename[PATH_MAX];
 392         int status;
 393
 394         ssnprintf (filename, sizeof (filename), "%s/%s/%s",
 395                         dir, power_supply, basename);
 396
 397         status = (int) read_file_contents (filename, buffer, buffer_size);
 398         if (status < 0)
 399                 return status;
 400
 401         strstripnewline (buffer);
 402         return 0;
 403 } /* }}} int sysfs_file_to_buffer */
 404
 405 /* Reads a file which contains only a number (and optionally a trailing
 406  * newline) and parses that number. */
 407 static int sysfs_file_to_gauge(char const *dir, /* {{{ */
 408                 char const *power_supply,
 409                 char const *basename, gauge_t *ret_value)
 410 {
 411         int status;
 412         char buffer[32] = "";
 413
 414         status = sysfs_file_to_buffer (dir, power_supply, basename, buffer, sizeof (buffer));
 415         if (status != 0)
 416                 return (status);
 417
 418         return (strtogauge (buffer, ret_value));
 419 } /* }}} sysfs_file_to_gauge */
 420
 421 static int read_sysfs_capacity (char const *dir, /* {{{ */
 422                 char const *power_supply,
 423                 char const *plugin_instance)
 424 {
 425         gauge_t capacity_charged = NAN;
 426         gauge_t capacity_full = NAN;
 427         gauge_t capacity_design = NAN;
 428         int status;
 429
 430         status = sysfs_file_to_gauge (dir, power_supply, "energy_now", &capacity_charged);
 431         if (status != 0)
 432                 return (status);
 433
 434         status = sysfs_file_to_gauge (dir, power_supply, "energy_full", &capacity_full);
 435         if (status != 0)
 436                 return (status);
 437
 438         status = sysfs_file_to_gauge (dir, power_supply, "energy_full_design", &capacity_design);
 439         if (status != 0)
 440                 return (status);
 441
 442         submit_capacity (plugin_instance,
 443                         capacity_charged * SYSFS_FACTOR,
 444                         capacity_full * SYSFS_FACTOR,
 445                         capacity_design * SYSFS_FACTOR);
 446         return (0);
 447 } /* }}} int read_sysfs_capacity */
 448
 449 static int read_sysfs_callback (char const *dir, /* {{{ */
 450                 char const *power_supply,
 451                 void *user_data)
 452 {
 453         int *battery_index = user_data;
 454
 455         char const *plugin_instance;
 456         char buffer[32];
 457         gauge_t v = NAN;
 458         _Bool discharging = 0;
 459         int status;
 460
 461         /* Ignore non-battery directories, such as AC power. */
 462         status = sysfs_file_to_buffer (dir, power_supply, "type", buffer, sizeof (buffer));
 463         if (status != 0)
 464                 return (0);
 465         if (strcasecmp ("Battery", buffer) != 0)
 466                 return (0);
 467
 468         (void) sysfs_file_to_buffer (dir, power_supply, "status", buffer, sizeof (buffer));
 469         if (strcasecmp ("Discharging", buffer) == 0)
 470                 discharging = 1;
 471
 472         /* FIXME: This is a dirty hack for backwards compatibility: The battery
 473          * plugin, for a very long time, has had the plugin_instance
 474          * hard-coded to "0". So, to keep backwards compatibility, we'll use
 475          * "0" for the first battery we find and the power_supply name for all
 476          * following. This should be reverted in a future major version. */
 477         plugin_instance = (*battery_index == 0) ? "0" : power_supply;
 478         (*battery_index)++;
 479
 480         read_sysfs_capacity (dir, power_supply, plugin_instance);
 481
 482         if (sysfs_file_to_gauge (dir, power_supply, "power_now", &v) == 0)
 483         {
 484                 if (discharging)
 485                         v *= -1.0;
 486                 battery_submit (plugin_instance, "power", v * SYSFS_FACTOR);
 487         }
 488         if (sysfs_file_to_gauge (dir, power_supply, "current_now", &v) == 0)
 489         {
 490                 if (discharging)
 491                         v *= -1.0;
 492                 battery_submit (plugin_instance, "current", v * SYSFS_FACTOR);
 493         }
 494
 495         if (sysfs_file_to_gauge (dir, power_supply, "voltage_now", &v) == 0)
 496                 battery_submit (plugin_instance, "voltage", v * SYSFS_FACTOR);
 497
 498         return (0);
 499 } /* }}} int read_sysfs_callback */
 500
 501 static int read_sysfs (void) /* {{{ */
 502 {
 503         int status;
 504         int battery_counter = 0;
 505
 506         if (access (SYSFS_PATH, R_OK) != 0)
 507                 return (ENOENT);
 508
 509         status = walk_directory (SYSFS_PATH, read_sysfs_callback,
 510                         /* user_data = */ &battery_counter,
 511                         /* include hidden */ 0);
 512         return (status);
 513 } /* }}} int read_sysfs */
 514
 515 static int read_acpi_full_capacity (char const *dir, /* {{{ */
 516                 char const *power_supply,
 517                 gauge_t *ret_capacity_full,
 518                 gauge_t *ret_capacity_design)
 519
 520 {
 521         char filename[PATH_MAX];
 522         char buffer[1024];
 523
 524         FILE *fh;
 525
 526         ssnprintf (filename, sizeof (filename), "%s/%s/info", dir, power_supply);
 527         fh = fopen (filename, "r");
 528         if (fh == NULL)
 529                 return (errno);
 530
 531         /* last full capacity:      40090 mWh */
 532         while (fgets (buffer, sizeof (buffer), fh) != NULL)
 533         {
 534                 gauge_t *value_ptr;
 535                 int fields_num;
 536                 char *fields[8];
 537                 int index;
 538
 539                 if (strncmp ("last full capacity:", buffer, strlen ("last full capacity:")) == 0)
 540                 {
 541                         value_ptr = ret_capacity_full;
 542                         index = 3;
 543                 }
 544                 else if (strncmp ("design capacity:", buffer, strlen ("design capacity:")) == 0)
 545                 {
 546                         value_ptr = ret_capacity_design;
 547                         index = 2;
 548                 }
 549                 else
 550                 {
 551                         continue;
 552                 }
 553
 554                 fields_num = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
 555                 if (fields_num <= index)
 556                         continue;
 557
 558                 strtogauge (fields[index], value_ptr);
 559         }
 560
 561         fclose (fh);
 562         return (0);
 563 } /* }}} int read_acpi_full_capacity */
 564
 565 static int read_acpi_callback (char const *dir, /* {{{ */
 566                 char const *power_supply,
 567                 void *user_data)
 568 {
 569         int *battery_index = user_data;
 570
 571         gauge_t power = NAN;
 572         gauge_t voltage = NAN;
 573         gauge_t capacity_charged = NAN;
 574         gauge_t capacity_full = NAN;
 575         gauge_t capacity_design = NAN;
 576         _Bool charging = 0;
 577         _Bool is_current = 0;
 578
 579         char const *plugin_instance;
 580         char filename[PATH_MAX];
 581         char buffer[1024];
 582
 583         FILE *fh;
 584
 585         ssnprintf (filename, sizeof (filename), "%s/%s/state", dir, power_supply);
 586         fh = fopen (filename, "r");
 587         if (fh == NULL)
 588         {
 589                 if ((errno == EAGAIN) || (errno == EINTR) || (errno == ENOENT))
 590                         return (0);
 591                 else
 592                         return (errno);
 593         }
 594
 595         /*
 596          * [11:00] <@tokkee> $ cat /proc/acpi/battery/BAT1/state
 597          * [11:00] <@tokkee> present:                 yes
 598          * [11:00] <@tokkee> capacity state:          ok
 599          * [11:00] <@tokkee> charging state:          charging
 600          * [11:00] <@tokkee> present rate:            1724 mA
 601          * [11:00] <@tokkee> remaining capacity:      4136 mAh
 602          * [11:00] <@tokkee> present voltage:         12428 mV
 603          */
 604         while (fgets (buffer, sizeof (buffer), fh) != NULL)
 605         {
 606                 char *fields[8];
 607                 int numfields;
 608
 609                 numfields = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
 610                 if (numfields < 3)
 611                         continue;
 612
 613                 if ((strcmp (fields[0], "charging") == 0)
 614                                 && (strcmp (fields[1], "state:") == 0))
 615                 {
 616                         if (strcmp (fields[2], "charging") == 0)
 617                                 charging = 1;
 618                         else
 619                                 charging = 0;
 620                         continue;
 621                 }
 622
 623                 /* The unit of "present rate" depends on the battery. Modern
 624                  * batteries export power (watts), older batteries (used to)
 625                  * export current (amperes). We check the fourth column and try
 626                  * to find old batteries this way. */
 627                 if ((strcmp (fields[0], "present") == 0)
 628                                 && (strcmp (fields[1], "rate:") == 0))
 629                 {
 630                         strtogauge (fields[2], &power);
 631
 632                         if ((numfields >= 4) && (strcmp ("mA", fields[3]) == 0))
 633                                 is_current = 1;
 634                 }
 635                 else if ((strcmp (fields[0], "remaining") == 0)
 636                                 && (strcmp (fields[1], "capacity:") == 0))
 637                         strtogauge (fields[2], &capacity_charged);
 638                 else if ((strcmp (fields[0], "present") == 0)
 639                                 && (strcmp (fields[1], "voltage:") == 0))
 640                         strtogauge (fields[2], &voltage);
 641         } /* while (fgets (buffer, sizeof (buffer), fh) != NULL) */
 642
 643         fclose (fh);
 644
 645         if (!charging)
 646                 power *= -1.0;
 647
 648         /* FIXME: This is a dirty hack for backwards compatibility: The battery
 649          * plugin, for a very long time, has had the plugin_instance
 650          * hard-coded to "0". So, to keep backwards compatibility, we'll use
 651          * "0" for the first battery we find and the power_supply name for all
 652          * following. This should be reverted in a future major version. */
 653         plugin_instance = (*battery_index == 0) ? "0" : power_supply;
 654         (*battery_index)++;
 655
 656         read_acpi_full_capacity (dir, power_supply, &capacity_full, &capacity_design);
 657
 658         submit_capacity (plugin_instance,
 659                         capacity_charged * PROC_ACPI_FACTOR,
 660                         capacity_full * PROC_ACPI_FACTOR,
 661                         capacity_design * PROC_ACPI_FACTOR);
 662
 663         battery_submit (plugin_instance,
 664                         is_current ? "current" : "power",
 665                         power * PROC_ACPI_FACTOR);
 666         battery_submit (plugin_instance, "voltage", voltage * PROC_ACPI_FACTOR);
 667
 668         return 0;
 669 } /* }}} int read_acpi_callback */
 670
 671 static int read_acpi (void) /* {{{ */
 672 {
 673         int status;
 674         int battery_counter = 0;
 675
 676         if (access (PROC_ACPI_PATH, R_OK) != 0)
 677                 return (ENOENT);
 678
 679         status = walk_directory (PROC_ACPI_PATH, read_acpi_callback,
 680                         /* user_data = */ &battery_counter,
 681                         /* include hidden */ 0);
 682         return (status);
 683 } /* }}} int read_acpi */
 684
 685 static int read_pmu (void) /* {{{ */
 686 {
 687         int i = 0;
 688         /* The upper limit here is just a safeguard. If there is a system with
 689          * more than 100 batteries, this can easily be increased. */
 690         for (; i < 100; i++)
 691         {
 692                 FILE *fh;
 693
 694                 char buffer[1024];
 695                 char filename[PATH_MAX];
 696                 char plugin_instance[DATA_MAX_NAME_LEN];
 697
 698                 gauge_t current = NAN;
 699                 gauge_t voltage = NAN;
 700                 gauge_t charge  = NAN;
 701
 702                 ssnprintf (filename, sizeof (filename), PROC_PMU_PATH_FORMAT, i);
 703                 if (access (filename, R_OK) != 0)
 704                         break;
 705
 706                 ssnprintf (plugin_instance, sizeof (plugin_instance), "%i", i);
 707
 708                 fh = fopen (filename, "r");
 709                 if (fh == NULL)
 710                 {
 711                         if (errno == ENOENT)
 712                                 break;
 713                         else if ((errno == EAGAIN) || (errno == EINTR))
 714                                 continue;
 715                         else
 716                                 return (errno);
 717                 }
 718
 719                 while (fgets (buffer, sizeof (buffer), fh) != NULL)
 720                 {
 721                         char *fields[8];
 722                         int numfields;
 723
 724                         numfields = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
 725                         if (numfields < 3)
 726                                 continue;
 727
 728                         if (strcmp ("current", fields[0]) == 0)
 729                                 strtogauge (fields[2], &current);
 730                         else if (strcmp ("voltage", fields[0]) == 0)
 731                                 strtogauge (fields[2], &voltage);
 732                         else if (strcmp ("charge", fields[0]) == 0)
 733                                 strtogauge (fields[2], &charge);
 734                 }
 735
 736                 fclose (fh);
 737                 fh = NULL;
 738
 739                 battery_submit (plugin_instance, "charge", charge / 1000.0);
 740                 battery_submit (plugin_instance, "current", current / 1000.0);
 741                 battery_submit (plugin_instance, "voltage", voltage / 1000.0);
 742         }
 743
 744         if (i == 0)
 745                 return (ENOENT);
 746         return (0);
 747 } /* }}} int read_pmu */
 748
 749 static int battery_read (void) /* {{{ */
 750 {
 751         int status;
 752
 753         if (query_statefs)
 754                 return battery_read_statefs ();
 755
 756         DEBUG ("battery plugin: Trying sysfs ...");
 757         status = read_sysfs ();
 758         if (status == 0)
 759                 return (0);
 760
 761         DEBUG ("battery plugin: Trying acpi ...");
 762         status = read_acpi ();
 763         if (status == 0)
 764                 return (0);
 765
 766         DEBUG ("battery plugin: Trying pmu ...");
 767         status = read_pmu ();
 768         if (status == 0)
 769                 return (0);
 770
 771         ERROR ("battery plugin: Add available input methods failed.");
 772         return (-1);
 773 } /* }}} int battery_read */
 774 #endif /* KERNEL_LINUX */
 775
 776 static int battery_config (oconfig_item_t *ci)
 777 {
 778         for (int i = 0; i < ci->children_num; i++)
 779         {
 780                 oconfig_item_t *child = ci->children + i;
 781
 782                 if (strcasecmp ("ValuesPercentage", child->key) == 0)
 783                         cf_util_get_boolean (child, &report_percent);
 784                 else if (strcasecmp ("ReportDegraded", child->key) == 0)
 785                         cf_util_get_boolean (child, &report_degraded);
 786                 else if (strcasecmp ("QueryStateFS", child->key) == 0)
 787                         cf_util_get_boolean (child, &query_statefs);
 788                 else
 789                         WARNING ("battery plugin: Ignoring unknown "
 790                                         "configuration option \"%s\".",
 791                                         child->key);
 792         }
 793
 794         return (0);
 795 } /* }}} int battery_config */
 796
 797 void module_register (void)
 798 {
 799         plugin_register_complex_config ("battery", battery_config);
 800         plugin_register_read ("battery", battery_read);
 801 } /* void module_register */