diff options
| author | Henrique de Moraes Holschuh <hmh@hmh.eng.br> | 2008-04-26 01:02:24 -0300 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2008-04-29 09:47:01 -0400 |
| commit | e306501d1c4ff610feaba74ac35dd13e470480e6 (patch) | |
| tree | 7d259445d984c8a4a69dd59121475deb01c84a6a /Documentation/laptops | |
| parent | 4fa6811b8ade1b7839342824939817a8fc751539 (diff) | |
| download | lwn-e306501d1c4ff610feaba74ac35dd13e470480e6.tar.gz lwn-e306501d1c4ff610feaba74ac35dd13e470480e6.zip | |
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/laptops')
| -rw-r--r-- | Documentation/laptops/thinkpad-acpi.txt | 25 |
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: https://bugs.freedesktop.org/show_bug.cgi?id=2000 -ThinkLight control -- /proc/acpi/ibm/light ------------------------------------------- +ThinkLight control +------------------ + +procfs: /proc/acpi/ibm/light +sysfs attributes: as per led class, for the "tpacpi::thinklight" led + +procfs notes: -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: +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 ------------------------------------------ |