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authorHenrique de Moraes Holschuh <hmh@hmh.eng.br>2008-04-26 00:02:24 -0400
committerLen Brown <len.brown@intel.com>2008-04-29 09:47:01 -0400
commite306501d1c4ff610feaba74ac35dd13e470480e6 (patch)
tree7d259445d984c8a4a69dd59121475deb01c84a6a /Documentation
parent4fa6811b8ade1b7839342824939817a8fc751539 (diff)
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>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/laptops/thinkpad-acpi.txt25
1 files changed, 20 insertions, 5 deletions
diff --git a/Documentation/laptops/thinkpad-acpi.txt b/Documentation/laptops/thinkpad-acpi.txt
index a41bc893f8d6..af1f2bcb6f66 100644
--- a/Documentation/laptops/thinkpad-acpi.txt
+++ b/Documentation/laptops/thinkpad-acpi.txt
@@ -693,16 +693,31 @@ while others are still having problems. For more information:
693 693
694https://bugs.freedesktop.org/show_bug.cgi?id=2000 694https://bugs.freedesktop.org/show_bug.cgi?id=2000
695 695
696ThinkLight control -- /proc/acpi/ibm/light 696ThinkLight control
697------------------------------------------ 697------------------
698
699procfs: /proc/acpi/ibm/light
700sysfs attributes: as per led class, for the "tpacpi::thinklight" led
701
702procfs notes:
698 703
699The current status of the ThinkLight can be found in this file. A few 704The ThinkLight status can be read and set through the procfs interface. A
700models which do not make the status available will show it as 705few models which do not make the status available will show the ThinkLight
701"unknown". The available commands are: 706status as "unknown". The available commands are:
702 707
703 echo on > /proc/acpi/ibm/light 708 echo on > /proc/acpi/ibm/light
704 echo off > /proc/acpi/ibm/light 709 echo off > /proc/acpi/ibm/light
705 710
711sysfs notes:
712
713The ThinkLight sysfs interface is documented by the led class
714documentation, in Documentation/leds-class.txt. The ThinkLight led name
715is "tpacpi::thinklight".
716
717Due to limitations in the sysfs led class, if the status of the thinklight
718cannot be read or if it is unknown, thinkpad-acpi will report it as "off".
719It is impossible to know if the status returned through sysfs is valid.
720
706Docking / undocking -- /proc/acpi/ibm/dock 721Docking / undocking -- /proc/acpi/ibm/dock
707------------------------------------------ 722------------------------------------------
708 723