Documentation: thinkpad-acpi - Document doubletap_enable attribute

Document the doubletap_enable sysfs attribute for ThinkPad ACPI driver.

Signed-off-by: Vishnu Sankar <vishnuocv@gmail.com>
Link: https://patch.msgid.link/20260311143144.482145-4-vishnuocv@gmail.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

diff --git a/Documentation/admin-guide/laptops/thinkpad-acpi.rst b/Documentation/admin-guide/laptops/thinkpad-acpi.rst
index 03951ed6b628fe1f6f4ac692ce5ab44d5a13ac1c..f874db31801dcb59711acef1a8c64411ec6fe00a 100644 (file)
--- a/Documentation/admin-guide/laptops/thinkpad-acpi.rst
+++ b/Documentation/admin-guide/laptops/thinkpad-acpi.rst
@@ -1522,6 +1522,27 @@ Currently 2 antenna types are supported as mentioned below:
 The property is read-only. If the platform doesn't have support the sysfs
 class is not created.
 
+doubletap_enable
+----------------
+
+sysfs: doubletap_enable
+
+Controls whether TrackPoint doubletap events are filtered out. Doubletap is a
+feature where quickly tapping the TrackPoint twice triggers a special function key event.
+
+The available commands are::
+
+                cat /sys/devices/platform/thinkpad_acpi/doubletap_enable
+                echo 1 | sudo tee /sys/devices/platform/thinkpad_acpi/doubletap_enable
+                echo 0 | sudo tee /sys/devices/platform/thinkpad_acpi/doubletap_enable
+
+Values:
+
+       * 1 - doubletap events are processed (default)
+       * 0 - doubletap events are filtered out (ignored)
+
+       This setting can also be toggled via the Fn+doubletap hotkey.
+
 Auxmac
 ------