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ACPI: thinkpad-acpi: add sysfs led class support to thinkpad leds (v3.2)

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Add a sysfs led class interface to the led 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 01:02:25 -03:00
committed by Len Brown
parent e306501d1c
commit af11610192
2 changed files with 176 additions and 7 deletions
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47
Documentation/laptops/thinkpad-acpi.txt
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@@ -876,28 +876,63 @@ The cmos command interface is prone to firmware split-brain problems, as
in newer ThinkPads it is just a compatibility layer. Do not use it, it is
exported just as a debug tool.
LED control -- /proc/acpi/ibm/led
---------------------------------
LED control
-----------
Some of the LED indicators can be controlled through this feature. The
available commands are:
procfs: /proc/acpi/ibm/led
sysfs attributes: as per led class, see below for names
Some of the LED indicators can be controlled through this feature. On
some older ThinkPad models, it is possible to query the status of the
LED indicators as well. Newer ThinkPads cannot query the real status
of the LED indicators.
procfs notes:
The available commands are:
echo '<led number> on' >/proc/acpi/ibm/led
echo '<led number> off' >/proc/acpi/ibm/led
echo '<led number> blink' >/proc/acpi/ibm/led
The <led number> range is 0 to 7. The set of LEDs that can be
controlled varies from model to model. Here is the mapping on the X40:
controlled varies from model to model. Here is the common ThinkPad
mapping:
0 - power
1 - battery (orange)
2 - battery (green)
3 - UltraBase
3 - UltraBase/dock
4 - UltraBay
5 - UltraBase battery slot
6 - (unknown)
7 - standby
All of the above can be turned on and off and can be made to blink.
sysfs notes:
The ThinkPad LED sysfs interface is described in detail by the led class
documentation, in Documentation/leds-class.txt.
The leds are named (in LED ID order, from 0 to 7):
"tpacpi::power", "tpacpi:orange:batt", "tpacpi:green:batt",
"tpacpi::dock_active", "tpacpi::bay_active", "tpacpi::dock_batt",
"tpacpi::unknown_led", "tpacpi::standby".
Due to limitations in the sysfs led class, if the status of the LED
indicators cannot be read due to an error, thinkpad-acpi will report it as
a brightness of zero (same as LED off).
If the thinkpad firmware doesn't support reading the current status,
trying to read the current LED brightness will just return whatever
brightness was last written to that attribute.
These LEDs can blink using hardware acceleration. To request that a
ThinkPad indicator LED should blink in hardware accelerated mode, use the
"timer" trigger, and leave the delay_on and delay_off parameters set to
zero (to request hardware acceleration autodetection).
ACPI sounds -- /proc/acpi/ibm/beep
----------------------------------