D25018: Move ACPI battery information from /proc/acpi to /sys

[José JORGE]

jjorge created this revision.
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REVISION SUMMARY
  Since kernel 2.6.24 in 2008, the /proc/acpi/battery interface is deprecated.
  There is for years no updated kernel which wouldn't provide the /sys/class/power_supply/BAT0 in a laptop 
  This patch removes the useless old path, and uses the sysfs to provide 3 informations :
  
  - current flow in mA (charge or discharge)
  - charge percent against last completed full charge
  - charge percent against battery by design charge
  
  Ref:
  https://cateee.net/lkddb/web-lkddb/ACPI_PROCFS_POWER.html
  https://bbs.archlinux.org/viewtopic.php?id=97761

REPOSITORY
  R106 KSysguard

BRANCH
  acpi-move-battery-to-sysfs

REVISION DETAIL
  https://phabricator.kde.org/D25018

AFFECTED FILES
  ksysguardd/Linux/acpi.c
  ksysguardd/Linux/acpi.h
  ksysguardd/modules.h

To: jjorge
Cc: plasma-devel, LeGast00n, The-Feren-OS-Dev, jraleigh, fbampaloukas, GB_2, ragreen, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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