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.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 (query_statefs)
 363                 return battery_read_statefs ();
 364
 365 #if HAVE_IOKIT_PS_IOPOWERSOURCES_H
 366         get_via_io_power_sources (&charge_rel, &current, &voltage);
 367 #endif
 368 #if HAVE_IOKIT_IOKITLIB_H
 369         get_via_generic_iokit (&capacity_full, &capacity_design, &current, &voltage);
 370 #endif
 371
 372         capacity_charged = charge_rel * capacity_full / 100.0;
 373         submit_capacity ("0", capacity_charged, capacity_full, capacity_design);
 374
 375         if (!isnan (current))
 376                 battery_submit ("0", "current", current);
 377         if (!isnan (voltage))
 378                 battery_submit ("0", "voltage", voltage);
 379
 380         return (0);
 381 } /* }}} int battery_read */
 382 /* #endif HAVE_IOKIT_IOKITLIB_H || HAVE_IOKIT_PS_IOPOWERSOURCES_H */
 383
 384 #elif KERNEL_LINUX
 385 /* Reads a file which contains only a number (and optionally a trailing
 386  * newline) and parses that number. */
 387 static int sysfs_file_to_buffer(char const *dir, /* {{{ */
 388                 char const *power_supply,
 389                 char const *basename,
 390                 char *buffer, size_t buffer_size)
 391 {
 392         char filename[PATH_MAX];
 393         int status;
 394
 395         ssnprintf (filename, sizeof (filename), "%s/%s/%s",
 396                         dir, power_supply, basename);
 397
 398         status = (int) read_file_contents (filename, buffer, buffer_size);
 399         if (status < 0)
 400                 return status;
 401
 402         strstripnewline (buffer);
 403         return 0;
 404 } /* }}} int sysfs_file_to_buffer */
 405
 406 /* Reads a file which contains only a number (and optionally a trailing
 407  * newline) and parses that number. */
 408 static int sysfs_file_to_gauge(char const *dir, /* {{{ */
 409                 char const *power_supply,
 410                 char const *basename, gauge_t *ret_value)
 411 {
 412         int status;
 413         char buffer[32] = "";
 414
 415         status = sysfs_file_to_buffer (dir, power_supply, basename, buffer, sizeof (buffer));
 416         if (status != 0)
 417                 return (status);
 418
 419         return (strtogauge (buffer, ret_value));
 420 } /* }}} sysfs_file_to_gauge */
 421
 422 static int read_sysfs_capacity (char const *dir, /* {{{ */
 423                 char const *power_supply,
 424                 char const *plugin_instance)
 425 {
 426         gauge_t capacity_charged = NAN;
 427         gauge_t capacity_full = NAN;
 428         gauge_t capacity_design = NAN;
 429         int status;
 430
 431         status = sysfs_file_to_gauge (dir, power_supply, "energy_now", &capacity_charged);
 432         if (status != 0)
 433                 return (status);
 434
 435         status = sysfs_file_to_gauge (dir, power_supply, "energy_full", &capacity_full);
 436         if (status != 0)
 437                 return (status);
 438
 439         status = sysfs_file_to_gauge (dir, power_supply, "energy_full_design", &capacity_design);
 440         if (status != 0)
 441                 return (status);
 442
 443         submit_capacity (plugin_instance,
 444                         capacity_charged * SYSFS_FACTOR,
 445                         capacity_full * SYSFS_FACTOR,
 446                         capacity_design * SYSFS_FACTOR);
 447         return (0);
 448 } /* }}} int read_sysfs_capacity */
 449
 450 static int read_sysfs_callback (char const *dir, /* {{{ */
 451                 char const *power_supply,
 452                 void *user_data)
 453 {
 454         int *battery_index = user_data;
 455
 456         char const *plugin_instance;
 457         char buffer[32];
 458         gauge_t v = NAN;
 459         _Bool discharging = 0;
 460         int status;
 461
 462         /* Ignore non-battery directories, such as AC power. */
 463         status = sysfs_file_to_buffer (dir, power_supply, "type", buffer, sizeof (buffer));
 464         if (status != 0)
 465                 return (0);
 466         if (strcasecmp ("Battery", buffer) != 0)
 467                 return (0);
 468
 469         (void) sysfs_file_to_buffer (dir, power_supply, "status", buffer, sizeof (buffer));
 470         if (strcasecmp ("Discharging", buffer) == 0)
 471                 discharging = 1;
 472
 473         /* FIXME: This is a dirty hack for backwards compatibility: The battery
 474          * plugin, for a very long time, has had the plugin_instance
 475          * hard-coded to "0". So, to keep backwards compatibility, we'll use
 476          * "0" for the first battery we find and the power_supply name for all
 477          * following. This should be reverted in a future major version. */
 478         plugin_instance = (*battery_index == 0) ? "0" : power_supply;
 479         (*battery_index)++;
 480
 481         read_sysfs_capacity (dir, power_supply, plugin_instance);
 482
 483         if (sysfs_file_to_gauge (dir, power_supply, "power_now", &v) == 0)
 484         {
 485                 if (discharging)
 486                         v *= -1.0;
 487                 battery_submit (plugin_instance, "power", v * SYSFS_FACTOR);
 488         }
 489         if (sysfs_file_to_gauge (dir, power_supply, "current_now", &v) == 0)
 490         {
 491                 if (discharging)
 492                         v *= -1.0;
 493                 battery_submit (plugin_instance, "current", v * SYSFS_FACTOR);
 494         }
 495
 496         if (sysfs_file_to_gauge (dir, power_supply, "voltage_now", &v) == 0)
 497                 battery_submit (plugin_instance, "voltage", v * SYSFS_FACTOR);
 498
 499         return (0);
 500 } /* }}} int read_sysfs_callback */
 501
 502 static int read_sysfs (void) /* {{{ */
 503 {
 504         int status;
 505         int battery_counter = 0;
 506
 507         if (access (SYSFS_PATH, R_OK) != 0)
 508                 return (ENOENT);
 509
 510         status = walk_directory (SYSFS_PATH, read_sysfs_callback,
 511                         /* user_data = */ &battery_counter,
 512                         /* include hidden */ 0);
 513         return (status);
 514 } /* }}} int read_sysfs */
 515
 516 static int read_acpi_full_capacity (char const *dir, /* {{{ */
 517                 char const *power_supply,
 518                 gauge_t *ret_capacity_full,
 519                 gauge_t *ret_capacity_design)
 520
 521 {
 522         char filename[PATH_MAX];
 523         char buffer[1024];
 524
 525         FILE *fh;
 526
 527         ssnprintf (filename, sizeof (filename), "%s/%s/info", dir, power_supply);
 528         fh = fopen (filename, "r");
 529         if (fh == NULL)
 530                 return (errno);
 531
 532         /* last full capacity:      40090 mWh */
 533         while (fgets (buffer, sizeof (buffer), fh) != NULL)
 534         {
 535                 gauge_t *value_ptr;
 536                 int fields_num;
 537                 char *fields[8];
 538                 int index;
 539
 540                 if (strncmp ("last full capacity:", buffer, strlen ("last full capacity:")) == 0)
 541                 {
 542                         value_ptr = ret_capacity_full;
 543                         index = 3;
 544                 }
 545                 else if (strncmp ("design capacity:", buffer, strlen ("design capacity:")) == 0)
 546                 {
 547                         value_ptr = ret_capacity_design;
 548                         index = 2;
 549                 }
 550                 else
 551                 {
 552                         continue;
 553                 }
 554
 555                 fields_num = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
 556                 if (fields_num <= index)
 557                         continue;
 558
 559                 strtogauge (fields[index], value_ptr);
 560         }
 561
 562         fclose (fh);
 563         return (0);
 564 } /* }}} int read_acpi_full_capacity */
 565
 566 static int read_acpi_callback (char const *dir, /* {{{ */
 567                 char const *power_supply,
 568                 void *user_data)
 569 {
 570         int *battery_index = user_data;
 571
 572         gauge_t power = NAN;
 573         gauge_t voltage = NAN;
 574         gauge_t capacity_charged = NAN;
 575         gauge_t capacity_full = NAN;
 576         gauge_t capacity_design = NAN;
 577         _Bool charging = 0;
 578         _Bool is_current = 0;
 579
 580         char const *plugin_instance;
 581         char filename[PATH_MAX];
 582         char buffer[1024];
 583
 584         FILE *fh;
 585
 586         ssnprintf (filename, sizeof (filename), "%s/%s/state", dir, power_supply);
 587         fh = fopen (filename, "r");
 588         if (fh == NULL)
 589         {
 590                 if ((errno == EAGAIN) || (errno == EINTR) || (errno == ENOENT))
 591                         return (0);
 592                 else
 593                         return (errno);
 594         }
 595
 596         /*
 597          * [11:00] <@tokkee> $ cat /proc/acpi/battery/BAT1/state
 598          * [11:00] <@tokkee> present:                 yes
 599          * [11:00] <@tokkee> capacity state:          ok
 600          * [11:00] <@tokkee> charging state:          charging
 601          * [11:00] <@tokkee> present rate:            1724 mA
 602          * [11:00] <@tokkee> remaining capacity:      4136 mAh
 603          * [11:00] <@tokkee> present voltage:         12428 mV
 604          */
 605         while (fgets (buffer, sizeof (buffer), fh) != NULL)
 606         {
 607                 char *fields[8];
 608                 int numfields;
 609
 610                 numfields = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
 611                 if (numfields < 3)
 612                         continue;
 613
 614                 if ((strcmp (fields[0], "charging") == 0)
 615                                 && (strcmp (fields[1], "state:") == 0))
 616                 {
 617                         if (strcmp (fields[2], "charging") == 0)
 618                                 charging = 1;
 619                         else
 620                                 charging = 0;
 621                         continue;
 622                 }
 623
 624                 /* The unit of "present rate" depends on the battery. Modern
 625                  * batteries export power (watts), older batteries (used to)
 626                  * export current (amperes). We check the fourth column and try
 627                  * to find old batteries this way. */
 628                 if ((strcmp (fields[0], "present") == 0)
 629                                 && (strcmp (fields[1], "rate:") == 0))
 630                 {
 631                         strtogauge (fields[2], &power);
 632
 633                         if ((numfields >= 4) && (strcmp ("mA", fields[3]) == 0))
 634                                 is_current = 1;
 635                 }
 636                 else if ((strcmp (fields[0], "remaining") == 0)
 637                                 && (strcmp (fields[1], "capacity:") == 0))
 638                         strtogauge (fields[2], &capacity_charged);
 639                 else if ((strcmp (fields[0], "present") == 0)
 640                                 && (strcmp (fields[1], "voltage:") == 0))
 641                         strtogauge (fields[2], &voltage);
 642         } /* while (fgets (buffer, sizeof (buffer), fh) != NULL) */
 643
 644         fclose (fh);
 645
 646         if (!charging)
 647                 power *= -1.0;
 648
 649         /* FIXME: This is a dirty hack for backwards compatibility: The battery
 650          * plugin, for a very long time, has had the plugin_instance
 651          * hard-coded to "0". So, to keep backwards compatibility, we'll use
 652          * "0" for the first battery we find and the power_supply name for all
 653          * following. This should be reverted in a future major version. */
 654         plugin_instance = (*battery_index == 0) ? "0" : power_supply;
 655         (*battery_index)++;
 656
 657         read_acpi_full_capacity (dir, power_supply, &capacity_full, &capacity_design);
 658
 659         submit_capacity (plugin_instance,
 660                         capacity_charged * PROC_ACPI_FACTOR,
 661                         capacity_full * PROC_ACPI_FACTOR,
 662                         capacity_design * PROC_ACPI_FACTOR);
 663
 664         battery_submit (plugin_instance,
 665                         is_current ? "current" : "power",
 666                         power * PROC_ACPI_FACTOR);
 667         battery_submit (plugin_instance, "voltage", voltage * PROC_ACPI_FACTOR);
 668
 669         return 0;
 670 } /* }}} int read_acpi_callback */
 671
 672 static int read_acpi (void) /* {{{ */
 673 {
 674         int status;
 675         int battery_counter = 0;
 676
 677         if (access (PROC_ACPI_PATH, R_OK) != 0)
 678                 return (ENOENT);
 679
 680         status = walk_directory (PROC_ACPI_PATH, read_acpi_callback,
 681                         /* user_data = */ &battery_counter,
 682                         /* include hidden */ 0);
 683         return (status);
 684 } /* }}} int read_acpi */
 685
 686 static int read_pmu (void) /* {{{ */
 687 {
 688         int i = 0;
 689         /* The upper limit here is just a safeguard. If there is a system with
 690          * more than 100 batteries, this can easily be increased. */
 691         for (; i < 100; i++)
 692         {
 693                 FILE *fh;
 694
 695                 char buffer[1024];
 696                 char filename[PATH_MAX];
 697                 char plugin_instance[DATA_MAX_NAME_LEN];
 698
 699                 gauge_t current = NAN;
 700                 gauge_t voltage = NAN;
 701                 gauge_t charge  = NAN;
 702
 703                 ssnprintf (filename, sizeof (filename), PROC_PMU_PATH_FORMAT, i);
 704                 if (access (filename, R_OK) != 0)
 705                         break;
 706
 707                 ssnprintf (plugin_instance, sizeof (plugin_instance), "%i", i);
 708
 709                 fh = fopen (filename, "r");
 710                 if (fh == NULL)
 711                 {
 712                         if (errno == ENOENT)
 713                                 break;
 714                         else if ((errno == EAGAIN) || (errno == EINTR))
 715                                 continue;
 716                         else
 717                                 return (errno);
 718                 }
 719
 720                 while (fgets (buffer, sizeof (buffer), fh) != NULL)
 721                 {
 722                         char *fields[8];
 723                         int numfields;
 724
 725                         numfields = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
 726                         if (numfields < 3)
 727                                 continue;
 728
 729                         if (strcmp ("current", fields[0]) == 0)
 730                                 strtogauge (fields[2], &current);
 731                         else if (strcmp ("voltage", fields[0]) == 0)
 732                                 strtogauge (fields[2], &voltage);
 733                         else if (strcmp ("charge", fields[0]) == 0)
 734                                 strtogauge (fields[2], &charge);
 735                 }
 736
 737                 fclose (fh);
 738                 fh = NULL;
 739
 740                 battery_submit (plugin_instance, "charge", charge / 1000.0);
 741                 battery_submit (plugin_instance, "current", current / 1000.0);
 742                 battery_submit (plugin_instance, "voltage", voltage / 1000.0);
 743         }
 744
 745         if (i == 0)
 746                 return (ENOENT);
 747         return (0);
 748 } /* }}} int read_pmu */
 749
 750 static int battery_read (void) /* {{{ */
 751 {
 752         int status;
 753
 754         if (query_statefs)
 755                 return battery_read_statefs ();
 756
 757         DEBUG ("battery plugin: Trying sysfs ...");
 758         status = read_sysfs ();
 759         if (status == 0)
 760                 return (0);
 761
 762         DEBUG ("battery plugin: Trying acpi ...");
 763         status = read_acpi ();
 764         if (status == 0)
 765                 return (0);
 766
 767         DEBUG ("battery plugin: Trying pmu ...");
 768         status = read_pmu ();
 769         if (status == 0)
 770                 return (0);
 771
 772         ERROR ("battery plugin: Add available input methods failed.");
 773         return (-1);
 774 } /* }}} int battery_read */
 775 #endif /* KERNEL_LINUX */
 776
 777 static int battery_config (oconfig_item_t *ci)
 778 {
 779         for (int i = 0; i < ci->children_num; i++)
 780         {
 781                 oconfig_item_t *child = ci->children + i;
 782
 783                 if (strcasecmp ("ValuesPercentage", child->key) == 0)
 784                         cf_util_get_boolean (child, &report_percent);
 785                 else if (strcasecmp ("ReportDegraded", child->key) == 0)
 786                         cf_util_get_boolean (child, &report_degraded);
 787                 else if (strcasecmp ("QueryStateFS", child->key) == 0)
 788                         cf_util_get_boolean (child, &query_statefs);
 789                 else
 790                         WARNING ("battery plugin: Ignoring unknown "
 791                                         "configuration option \"%s\".",
 792                                         child->key);
 793         }
 794
 795         return (0);
 796 } /* }}} int battery_config */
 797
 798 void module_register (void)
 799 {
 800         plugin_register_complex_config ("battery", battery_config);
 801         plugin_register_read ("battery", battery_read);
 802 } /* void module_register */