ACPI: thinkpad-acpi: add sysfs led class support for thinklight (v3.1)
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>
diff --git a/Documentation/laptops/thinkpad-acpi.txt b/Documentation/laptops/thinkpad-acpi.txt
index a41bc89..af1f2bcb 100644
--- a/Documentation/laptops/thinkpad-acpi.txt
+++ b/Documentation/laptops/thinkpad-acpi.txt
@@ -693,16 +693,31 @@
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
------------------------------------------