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ACPI: thinkpad-acpi: add sysfs led class support for thinklight (v3.1)

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Add a sysfs led class interface to the thinklight (light subdriver).

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Henrique de Moraes Holschuh
2008-04-26 01:02:24 -03:00
committed by Len Brown
parent 4fa6811b8a
commit e306501d1c
2 changed files with 76 additions and 6 deletions
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25
Documentation/laptops/thinkpad-acpi.txt
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@ -693,16 +693,31 @@ while others are still having problems. For more information:
https://bugs.freedesktop.org/show_bug.cgi?id=2000
ThinkLight control -- /proc/acpi/ibm/light
------------------------------------------
ThinkLight control
------------------
The current status of the ThinkLight can be found in this file. A few
models which do not make the status available will show it as
"unknown". The available commands are:
procfs: /proc/acpi/ibm/light
sysfs attributes: as per led class, for the "tpacpi::thinklight" led
procfs notes:
The ThinkLight status can be read and set through the procfs interface. A
few models which do not make the status available will show the ThinkLight
status as "unknown". The available commands are:
echo on > /proc/acpi/ibm/light
echo off > /proc/acpi/ibm/light
sysfs notes:
The ThinkLight sysfs interface is documented by the led class
documentation, in Documentation/leds-class.txt. The ThinkLight led name
is "tpacpi::thinklight".
Due to limitations in the sysfs led class, if the status of the thinklight
cannot be read or if it is unknown, thinkpad-acpi will report it as "off".
It is impossible to know if the status returned through sysfs is valid.
Docking / undocking -- /proc/acpi/ibm/dock
------------------------------------------