1 files changed, 47 insertions, 11 deletions

diff --git a/Documentation/thinkpad-acpi.txt b/Documentation/thinkpad-acpi.txt
index e3ad7a4f7402..ebeed589f6d7 100644
--- a/Documentation/thinkpad-acpi.txt
+++ b/Documentation/thinkpad-acpi.txt
@@ -134,8 +134,11 @@ end of this document.  Changes to the sysfs interface done by the kernel
 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 @@ All labeled Fn-Fx key combinations generate distinct events. In
 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 @@ buttons do not generate ACPI events even with this driver. They *can*
 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
 -------------------------------------