ACPI: thinkpad-acpi: add sysfs support to hotkey subdriver
Add the hotkey sysfs support.
Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/Documentation/thinkpad-acpi.txt b/Documentation/thinkpad-acpi.txt
index e3ad7a4..ebeed58 100644
--- a/Documentation/thinkpad-acpi.txt
+++ b/Documentation/thinkpad-acpi.txt
@@ -134,8 +134,11 @@
subsystems are not documented here, nor are they tracked by this
attribute.
-Hot keys -- /proc/acpi/ibm/hotkey
----------------------------------
+Hot keys
+--------
+
+procfs: /proc/acpi/ibm/hotkey
+sysfs device attribute: hotkey/*
Without this driver, only the Fn-F4 key (sleep button) generates an
ACPI event. With the driver loaded, the hotkey feature enabled and the
@@ -149,15 +152,6 @@
addition, the lid microswitch and some docking station buttons may
also generate such events.
-The following commands can be written to this file:
-
- echo enable > /proc/acpi/ibm/hotkey -- enable the hot keys feature
- echo disable > /proc/acpi/ibm/hotkey -- disable the hot keys feature
- echo 0xffff > /proc/acpi/ibm/hotkey -- enable all possible hot keys
- echo 0x0000 > /proc/acpi/ibm/hotkey -- disable all possible hot keys
- ... any other 4-hex-digit mask ...
- echo reset > /proc/acpi/ibm/hotkey -- restore the original mask
-
The bit mask allows some control over which hot keys generate ACPI
events. Not all bits in the mask can be modified. Not all bits that
can be modified do anything. Not all hot keys can be individually
@@ -189,6 +183,48 @@
be used through the "ThinkPad Buttons" utility, see
http://www.nongnu.org/tpb/
+procfs notes:
+
+The following commands can be written to the /proc/acpi/ibm/hotkey file:
+
+ echo enable > /proc/acpi/ibm/hotkey -- enable the hot keys feature
+ echo disable > /proc/acpi/ibm/hotkey -- disable the hot keys feature
+ echo 0xffff > /proc/acpi/ibm/hotkey -- enable all possible hot keys
+ echo 0x0000 > /proc/acpi/ibm/hotkey -- disable all possible hot keys
+ ... any other 4-hex-digit mask ...
+ echo reset > /proc/acpi/ibm/hotkey -- restore the original mask
+
+sysfs notes:
+
+ The hot keys attributes are in a hotkey/ subdirectory off the
+ thinkpad device.
+
+ bios_enabled:
+ Returns the status of the hot keys feature when
+ thinkpad-acpi was loaded. Upon module unload, the hot
+ key feature status will be restored to this value.
+
+ 0: hot keys were disabled
+ 1: hot keys were enabled
+
+ bios_mask:
+ Returns the hot keys mask when thinkpad-acpi was loaded.
+ Upon module unload, the hot keys mask will be restored
+ to this value.
+
+ enable:
+ Enables/disables the hot keys feature, and reports
+ current status of the hot keys feature.
+
+ 0: disables the hot keys feature / feature disabled
+ 1: enables the hot keys feature / feature enabled
+
+ mask:
+ bit mask to enable ACPI event generation for each hot
+ key (see above). Returns the current status of the hot
+ keys mask, and allows one to modify it.
+
+
Bluetooth -- /proc/acpi/ibm/bluetooth
-------------------------------------