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platform/x86: thinkpad_acpi: add documentation for battery charge control

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Add a section to the Thinkpad ACPI extras driver documentation detailing
the provided features that may be used to modify battery charge related state.
As of yet, only charge_control_{start,end}_threshold attributes are supported
and documented.

Signed-off-by: Barnabás Pőcze <pobrn@protonmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
Barnabás Pőcze 2020-07-27 19:31:25 +00:00 committed by Andy Shevchenko
parent e33929537b
commit 6178129852
1 changed files with 17 additions and 0 deletions
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17
Documentation/admin-guide/laptops/thinkpad-acpi.rst
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@ -1485,6 +1485,23 @@ For more details about which buttons will appear depending on the mode, please
review the laptop's user guide:
http://www.lenovo.com/shop/americas/content/user_guides/x1carbon_2_ug_en.pdf
Battery charge control
----------------------
sysfs attributes:
/sys/class/power_supply/BAT*/charge_control_{start,end}_threshold
These two attributes are created for those batteries that are supported by the
driver. They enable the user to control the battery charge thresholds of the
given battery. Both values may be read and set. `charge_control_start_threshold`
accepts an integer between 0 and 99 (inclusive); this value represents a battery
percentage level, below which charging will begin. `charge_control_end_threshold`
accepts an integer between 1 and 100 (inclusive); this value represents a battery
percentage level, above which charging will stop.
The exact semantics of the attributes may be found in
Documentation/ABI/testing/sysfs-class-power.
Multiple Commands, Module Parameters
------------------------------------