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         int i;
 206
 207         ps_raw       = IOPSCopyPowerSourcesInfo ();
 208         ps_array     = IOPSCopyPowerSourcesList (ps_raw);
 209         ps_array_len = CFArrayGetCount (ps_array);
 210
 211         DEBUG ("ps_array_len == %i", ps_array_len);
 212
 213         for (i = 0; i < ps_array_len; i++)
 214         {
 215                 ps_obj  = CFArrayGetValueAtIndex (ps_array, i);
 216                 ps_dict = IOPSGetPowerSourceDescription (ps_raw, ps_obj);
 217
 218                 if (ps_dict == NULL)
 219                 {
 220                         DEBUG ("IOPSGetPowerSourceDescription failed.");
 221                         continue;
 222                 }
 223
 224                 if (CFGetTypeID (ps_dict) != CFDictionaryGetTypeID ())
 225                 {
 226                         DEBUG ("IOPSGetPowerSourceDescription did not return a CFDictionaryRef");
 227                         continue;
 228                 }
 229
 230                 /* FIXME: Check if this is really an internal battery */
 231
 232                 if (isnan (*ret_charge))
 233                 {
 234                         /* This is the charge in percent. */
 235                         temp_double = dict_get_double (ps_dict,
 236                                         kIOPSCurrentCapacityKey);
 237                         if (!isnan ((temp_double))
 238                                         && (temp_double >= 0.0)
 239                                         && (temp_double <= 100.0))
 240                                 *ret_charge = temp_double;
 241                 }
 242
 243                 if (isnan (*ret_current))
 244                 {
 245                         temp_double = dict_get_double (ps_dict,
 246                                         kIOPSCurrentKey);
 247                         if (!isnan (temp_double))
 248                                 *ret_current = temp_double / 1000.0;
 249                 }
 250
 251                 if (isnan (*ret_voltage))
 252                 {
 253                         temp_double = dict_get_double (ps_dict,
 254                                         kIOPSVoltageKey);
 255                         if (!isnan (temp_double))
 256                                 *ret_voltage = temp_double / 1000.0;
 257                 }
 258         }
 259
 260         CFRelease(ps_array);
 261         CFRelease(ps_raw);
 262 } /* }}} void get_via_io_power_sources */
 263 # endif /* HAVE_IOKIT_PS_IOPOWERSOURCES_H */
 264
 265 # if HAVE_IOKIT_IOKITLIB_H
 266 static void get_via_generic_iokit (double *ret_capacity_full, /* {{{ */
 267                 double *ret_capacity_design,
 268                 double *ret_current,
 269                 double *ret_voltage)
 270 {
 271         kern_return_t   status;
 272         io_iterator_t   iterator;
 273         io_object_t     io_obj;
 274
 275         CFDictionaryRef bat_root_dict;
 276         CFArrayRef      bat_info_arry;
 277         CFIndex         bat_info_arry_len;
 278         CFIndex         bat_info_arry_pos;
 279         CFDictionaryRef bat_info_dict;
 280
 281         double temp_double;
 282
 283         status = IOServiceGetMatchingServices (kIOMasterPortDefault,
 284                         IOServiceNameMatching ("battery"),
 285                         &iterator);
 286         if (status != kIOReturnSuccess)
 287         {
 288                 DEBUG ("IOServiceGetMatchingServices failed.");
 289                 return;
 290         }
 291
 292         while ((io_obj = IOIteratorNext (iterator)))
 293         {
 294                 status = IORegistryEntryCreateCFProperties (io_obj,
 295                                 (CFMutableDictionaryRef *) &bat_root_dict,
 296                                 kCFAllocatorDefault,
 297                                 kNilOptions);
 298                 if (status != kIOReturnSuccess)
 299                 {
 300                         DEBUG ("IORegistryEntryCreateCFProperties failed.");
 301                         continue;
 302                 }
 303
 304                 bat_info_arry = (CFArrayRef) CFDictionaryGetValue (bat_root_dict,
 305                                 CFSTR ("IOBatteryInfo"));
 306                 if (bat_info_arry == NULL)
 307                 {
 308                         CFRelease (bat_root_dict);
 309                         continue;
 310                 }
 311                 bat_info_arry_len = CFArrayGetCount (bat_info_arry);
 312
 313                 for (bat_info_arry_pos = 0;
 314                                 bat_info_arry_pos < bat_info_arry_len;
 315                                 bat_info_arry_pos++)
 316                 {
 317                         bat_info_dict = (CFDictionaryRef) CFArrayGetValueAtIndex (bat_info_arry, bat_info_arry_pos);
 318
 319                         if (isnan (*ret_capacity_full))
 320                         {
 321                                 temp_double = dict_get_double (bat_info_dict, "Capacity");
 322                                 *ret_capacity_full = temp_double / 1000.0;
 323                         }
 324
 325                         if (isnan (*ret_capacity_design))
 326                         {
 327                                 temp_double = dict_get_double (bat_info_dict, "AbsoluteMaxCapacity");
 328                                 *ret_capacity_design = temp_double / 1000.0;
 329                         }
 330
 331                         if (isnan (*ret_current))
 332                         {
 333                                 temp_double = dict_get_double (bat_info_dict, "Current");
 334                                 *ret_current = temp_double / 1000.0;
 335                         }
 336
 337                         if (isnan (*ret_voltage))
 338                         {
 339                                 temp_double = dict_get_double (bat_info_dict, "Voltage");
 340                                 *ret_voltage = temp_double / 1000.0;
 341                         }
 342                 }
 343
 344                 CFRelease (bat_root_dict);
 345         }
 346
 347         IOObjectRelease (iterator);
 348 } /* }}} void get_via_generic_iokit */
 349 # endif /* HAVE_IOKIT_IOKITLIB_H */
 350
 351 static int battery_read (void) /* {{{ */
 352 {
 353         gauge_t current = NAN; /* Current in A */
 354         gauge_t voltage = NAN; /* Voltage in V */
 355
 356         /* We only get the charged capacity as a percentage from
 357          * IOPowerSources. IOKit, on the other hand, only reports the full
 358          * capacity. We use the two to calculate the current charged capacity. */
 359         gauge_t charge_rel = NAN; /* Current charge in percent */
 360         gauge_t capacity_charged; /* Charged capacity */
 361         gauge_t capacity_full = NAN; /* Total capacity */
 362         gauge_t capacity_design = NAN; /* Full design capacity */
 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         int status;
 392         FILE *fp;
 393         char filename[PATH_MAX];
 394
 395         ssnprintf (filename, sizeof (filename), "%s/%s/%s",
 396                         dir, power_supply, basename);
 397
 398         /* No file isn't the end of the world -- not every system will be
 399          * reporting the same set of statistics */
 400         if (access (filename, R_OK) != 0)
 401                 return ENOENT;
 402
 403         fp = fopen (filename, "r");
 404         if (fp == NULL)
 405         {
 406                 status = errno;
 407                 if (status != ENOENT)
 408                 {
 409                         char errbuf[1024];
 410                         WARNING ("battery plugin: fopen (%s) failed: %s", filename,
 411                                         sstrerror (status, errbuf, sizeof (errbuf)));
 412                 }
 413                 return status;
 414         }
 415
 416         if (fgets (buffer, buffer_size, fp) == NULL)
 417         {
 418                 status = errno;
 419                 if (status != ENODEV)
 420                 {
 421                         char errbuf[1024];
 422                         WARNING ("battery plugin: fgets (%s) failed: %s", filename,
 423                                         sstrerror (status, errbuf, sizeof (errbuf)));
 424                 }
 425                 fclose (fp);
 426                 return status;
 427         }
 428
 429         strstripnewline (buffer);
 430
 431         fclose (fp);
 432         return 0;
 433 } /* }}} int sysfs_file_to_buffer */
 434
 435 /* Reads a file which contains only a number (and optionally a trailing
 436  * newline) and parses that number. */
 437 static int sysfs_file_to_gauge(char const *dir, /* {{{ */
 438                 char const *power_supply,
 439                 char const *basename, gauge_t *ret_value)
 440 {
 441         int status;
 442         char buffer[32] = "";
 443
 444         status = sysfs_file_to_buffer (dir, power_supply, basename, buffer, sizeof (buffer));
 445         if (status != 0)
 446                 return (status);
 447
 448         return (strtogauge (buffer, ret_value));
 449 } /* }}} sysfs_file_to_gauge */
 450
 451 static int read_sysfs_capacity (char const *dir, /* {{{ */
 452                 char const *power_supply,
 453                 char const *plugin_instance)
 454 {
 455         gauge_t capacity_charged = NAN;
 456         gauge_t capacity_full = NAN;
 457         gauge_t capacity_design = NAN;
 458         int status;
 459
 460         status = sysfs_file_to_gauge (dir, power_supply, "energy_now", &capacity_charged);
 461         if (status != 0)
 462                 return (status);
 463
 464         status = sysfs_file_to_gauge (dir, power_supply, "energy_full", &capacity_full);
 465         if (status != 0)
 466                 return (status);
 467
 468         status = sysfs_file_to_gauge (dir, power_supply, "energy_full_design", &capacity_design);
 469         if (status != 0)
 470                 return (status);
 471
 472         submit_capacity (plugin_instance,
 473                         capacity_charged * SYSFS_FACTOR,
 474                         capacity_full * SYSFS_FACTOR,
 475                         capacity_design * SYSFS_FACTOR);
 476         return (0);
 477 } /* }}} int read_sysfs_capacity */
 478
 479 static int read_sysfs_callback (char const *dir, /* {{{ */
 480                 char const *power_supply,
 481                 void *user_data)
 482 {
 483         int *battery_index = user_data;
 484
 485         char const *plugin_instance;
 486         char buffer[32];
 487         gauge_t v = NAN;
 488         _Bool discharging = 0;
 489         int status;
 490
 491         /* Ignore non-battery directories, such as AC power. */
 492         status = sysfs_file_to_buffer (dir, power_supply, "type", buffer, sizeof (buffer));
 493         if (status != 0)
 494                 return (0);
 495         if (strcasecmp ("Battery", buffer) != 0)
 496                 return (0);
 497
 498         (void) sysfs_file_to_buffer (dir, power_supply, "status", buffer, sizeof (buffer));
 499         if (strcasecmp ("Discharging", buffer) == 0)
 500                 discharging = 1;
 501
 502         /* FIXME: This is a dirty hack for backwards compatibility: The battery
 503          * plugin, for a very long time, has had the plugin_instance
 504          * hard-coded to "0". So, to keep backwards compatibility, we'll use
 505          * "0" for the first battery we find and the power_supply name for all
 506          * following. This should be reverted in a future major version. */
 507         plugin_instance = (*battery_index == 0) ? "0" : power_supply;
 508         (*battery_index)++;
 509
 510         read_sysfs_capacity (dir, power_supply, plugin_instance);
 511
 512         if (sysfs_file_to_gauge (dir, power_supply, "power_now", &v) == 0)
 513         {
 514                 if (discharging)
 515                         v *= -1.0;
 516                 battery_submit (plugin_instance, "power", v * SYSFS_FACTOR);
 517         }
 518         if (sysfs_file_to_gauge (dir, power_supply, "current_now", &v) == 0)
 519         {
 520                 if (discharging)
 521                         v *= -1.0;
 522                 battery_submit (plugin_instance, "current", v * SYSFS_FACTOR);
 523         }
 524
 525         if (sysfs_file_to_gauge (dir, power_supply, "voltage_now", &v) == 0)
 526                 battery_submit (plugin_instance, "voltage", v * SYSFS_FACTOR);
 527
 528         return (0);
 529 } /* }}} int read_sysfs_callback */
 530
 531 static int read_sysfs (void) /* {{{ */
 532 {
 533         int status;
 534         int battery_counter = 0;
 535
 536         if (access (SYSFS_PATH, R_OK) != 0)
 537                 return (ENOENT);
 538
 539         status = walk_directory (SYSFS_PATH, read_sysfs_callback,
 540                         /* user_data = */ &battery_counter,
 541                         /* include hidden */ 0);
 542         return (status);
 543 } /* }}} int read_sysfs */
 544
 545 static int read_acpi_full_capacity (char const *dir, /* {{{ */
 546                 char const *power_supply,
 547                 gauge_t *ret_capacity_full,
 548                 gauge_t *ret_capacity_design)
 549
 550 {
 551         char filename[PATH_MAX];
 552         char buffer[1024];
 553
 554         FILE *fh;
 555
 556         ssnprintf (filename, sizeof (filename), "%s/%s/info", dir, power_supply);
 557         fh = fopen (filename, "r");
 558         if (fh == NULL)
 559                 return (errno);
 560
 561         /* last full capacity:      40090 mWh */
 562         while (fgets (buffer, sizeof (buffer), fh) != NULL)
 563         {
 564                 gauge_t *value_ptr;
 565                 int fields_num;
 566                 char *fields[8];
 567                 int index;
 568
 569                 if (strncmp ("last full capacity:", buffer, strlen ("last full capacity:")) == 0)
 570                 {
 571                         value_ptr = ret_capacity_full;
 572                         index = 3;
 573                 }
 574                 else if (strncmp ("design capacity:", buffer, strlen ("design capacity:")) == 0)
 575                 {
 576                         value_ptr = ret_capacity_design;
 577                         index = 2;
 578                 }
 579                 else
 580                 {
 581                         continue;
 582                 }
 583
 584                 fields_num = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
 585                 if (fields_num <= index)
 586                         continue;
 587
 588                 strtogauge (fields[index], value_ptr);
 589         }
 590
 591         fclose (fh);
 592         return (0);
 593 } /* }}} int read_acpi_full_capacity */
 594
 595 static int read_acpi_callback (char const *dir, /* {{{ */
 596                 char const *power_supply,
 597                 void *user_data)
 598 {
 599         int *battery_index = user_data;
 600
 601         gauge_t power = NAN;
 602         gauge_t voltage = NAN;
 603         gauge_t capacity_charged = NAN;
 604         gauge_t capacity_full = NAN;
 605         gauge_t capacity_design = NAN;
 606         _Bool charging = 0;
 607         _Bool is_current = 0;
 608
 609         char const *plugin_instance;
 610         char filename[PATH_MAX];
 611         char buffer[1024];
 612
 613         FILE *fh;
 614
 615         ssnprintf (filename, sizeof (filename), "%s/%s/state", dir, power_supply);
 616         fh = fopen (filename, "r");
 617         if (fh == NULL)
 618         {
 619                 if ((errno == EAGAIN) || (errno == EINTR) || (errno == ENOENT))
 620                         return (0);
 621                 else
 622                         return (errno);
 623         }
 624
 625         /*
 626          * [11:00] <@tokkee> $ cat /proc/acpi/battery/BAT1/state
 627          * [11:00] <@tokkee> present:                 yes
 628          * [11:00] <@tokkee> capacity state:          ok
 629          * [11:00] <@tokkee> charging state:          charging
 630          * [11:00] <@tokkee> present rate:            1724 mA
 631          * [11:00] <@tokkee> remaining capacity:      4136 mAh
 632          * [11:00] <@tokkee> present voltage:         12428 mV
 633          */
 634         while (fgets (buffer, sizeof (buffer), fh) != NULL)
 635         {
 636                 char *fields[8];
 637                 int numfields;
 638
 639                 numfields = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
 640                 if (numfields < 3)
 641                         continue;
 642
 643                 if ((strcmp (fields[0], "charging") == 0)
 644                                 && (strcmp (fields[1], "state:") == 0))
 645                 {
 646                         if (strcmp (fields[2], "charging") == 0)
 647                                 charging = 1;
 648                         else
 649                                 charging = 0;
 650                         continue;
 651                 }
 652
 653                 /* The unit of "present rate" depends on the battery. Modern
 654                  * batteries export power (watts), older batteries (used to)
 655                  * export current (amperes). We check the fourth column and try
 656                  * to find old batteries this way. */
 657                 if ((strcmp (fields[0], "present") == 0)
 658                                 && (strcmp (fields[1], "rate:") == 0))
 659                 {
 660                         strtogauge (fields[2], &power);
 661
 662                         if ((numfields >= 4) && (strcmp ("mA", fields[3]) == 0))
 663                                 is_current = 1;
 664                 }
 665                 else if ((strcmp (fields[0], "remaining") == 0)
 666                                 && (strcmp (fields[1], "capacity:") == 0))
 667                         strtogauge (fields[2], &capacity_charged);
 668                 else if ((strcmp (fields[0], "present") == 0)
 669                                 && (strcmp (fields[1], "voltage:") == 0))
 670                         strtogauge (fields[2], &voltage);
 671         } /* while (fgets (buffer, sizeof (buffer), fh) != NULL) */
 672
 673         fclose (fh);
 674
 675         if (!charging)
 676                 power *= -1.0;
 677
 678         /* FIXME: This is a dirty hack for backwards compatibility: The battery
 679          * plugin, for a very long time, has had the plugin_instance
 680          * hard-coded to "0". So, to keep backwards compatibility, we'll use
 681          * "0" for the first battery we find and the power_supply name for all
 682          * following. This should be reverted in a future major version. */
 683         plugin_instance = (*battery_index == 0) ? "0" : power_supply;
 684         (*battery_index)++;
 685
 686         read_acpi_full_capacity (dir, power_supply, &capacity_full, &capacity_design);
 687
 688         submit_capacity (plugin_instance,
 689                         capacity_charged * PROC_ACPI_FACTOR,
 690                         capacity_full * PROC_ACPI_FACTOR,
 691                         capacity_design * PROC_ACPI_FACTOR);
 692
 693         battery_submit (plugin_instance,
 694                         is_current ? "current" : "power",
 695                         power * PROC_ACPI_FACTOR);
 696         battery_submit (plugin_instance, "voltage", voltage * PROC_ACPI_FACTOR);
 697
 698         return 0;
 699 } /* }}} int read_acpi_callback */
 700
 701 static int read_acpi (void) /* {{{ */
 702 {
 703         int status;
 704         int battery_counter = 0;
 705
 706         if (access (PROC_ACPI_PATH, R_OK) != 0)
 707                 return (ENOENT);
 708
 709         status = walk_directory (PROC_ACPI_PATH, read_acpi_callback,
 710                         /* user_data = */ &battery_counter,
 711                         /* include hidden */ 0);
 712         return (status);
 713 } /* }}} int read_acpi */
 714
 715 static int read_pmu (void) /* {{{ */
 716 {
 717         int i;
 718
 719         /* The upper limit here is just a safeguard. If there is a system with
 720          * more than 100 batteries, this can easily be increased. */
 721         for (i = 0; i < 100; i++)
 722         {
 723                 FILE *fh;
 724
 725                 char buffer[1024];
 726                 char filename[PATH_MAX];
 727                 char plugin_instance[DATA_MAX_NAME_LEN];
 728
 729                 gauge_t current = NAN;
 730                 gauge_t voltage = NAN;
 731                 gauge_t charge  = NAN;
 732
 733                 ssnprintf (filename, sizeof (filename), PROC_PMU_PATH_FORMAT, i);
 734                 if (access (filename, R_OK) != 0)
 735                         break;
 736
 737                 ssnprintf (plugin_instance, sizeof (plugin_instance), "%i", i);
 738
 739                 fh = fopen (filename, "r");
 740                 if (fh == NULL)
 741                 {
 742                         if (errno == ENOENT)
 743                                 break;
 744                         else if ((errno == EAGAIN) || (errno == EINTR))
 745                                 continue;
 746                         else
 747                                 return (errno);
 748                 }
 749
 750                 while (fgets (buffer, sizeof (buffer), fh) != NULL)
 751                 {
 752                         char *fields[8];
 753                         int numfields;
 754
 755                         numfields = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
 756                         if (numfields < 3)
 757                                 continue;
 758
 759                         if (strcmp ("current", fields[0]) == 0)
 760                                 strtogauge (fields[2], &current);
 761                         else if (strcmp ("voltage", fields[0]) == 0)
 762                                 strtogauge (fields[2], &voltage);
 763                         else if (strcmp ("charge", fields[0]) == 0)
 764                                 strtogauge (fields[2], &charge);
 765                 }
 766
 767                 fclose (fh);
 768                 fh = NULL;
 769
 770                 battery_submit (plugin_instance, "charge", charge / 1000.0);
 771                 battery_submit (plugin_instance, "current", current / 1000.0);
 772                 battery_submit (plugin_instance, "voltage", voltage / 1000.0);
 773         }
 774
 775         if (i == 0)
 776                 return (ENOENT);
 777         return (0);
 778 } /* }}} int read_pmu */
 779
 780 static int battery_read (void) /* {{{ */
 781 {
 782         int status;
 783
 784         DEBUG ("battery plugin: Trying sysfs ...");
 785         status = read_sysfs ();
 786         if (status == 0)
 787                 return (0);
 788
 789         DEBUG ("battery plugin: Trying acpi ...");
 790         status = read_acpi ();
 791         if (status == 0)
 792                 return (0);
 793
 794         DEBUG ("battery plugin: Trying pmu ...");
 795         status = read_pmu ();
 796         if (status == 0)
 797                 return (0);
 798
 799         ERROR ("battery plugin: Add available input methods failed.");
 800         return (-1);
 801 } /* }}} int battery_read */
 802 #endif /* KERNEL_LINUX */
 803
 804 static int battery_config (oconfig_item_t *ci)
 805 {
 806         int i;
 807
 808         for (i = 0; i < ci->children_num; i++)
 809         {
 810                 oconfig_item_t *child = ci->children + i;
 811
 812                 if (strcasecmp ("ValuesPercentage", child->key) == 0)
 813                         cf_util_get_boolean (child, &report_percent);
 814                 else if (strcasecmp ("ReportDegraded", child->key) == 0)
 815                         cf_util_get_boolean (child, &report_degraded);
 816                 else
 817                         WARNING ("battery plugin: Ignoring unknown "
 818                                         "configuration option \"%s\".",
 819                                         child->key);
 820         }
 821
 822         return (0);
 823 } /* }}} int battery_config */
 824
 825 void module_register (void)
 826 {
 827         plugin_register_complex_config ("battery", battery_config);
 828         plugin_register_read ("battery", battery_read);
 829 } /* void module_register */