Descriptions have been collected from git commit logs, code commits and
the TrackPoint System Version 4.0 Engineering Specification.
Signed-off-by: Aishwarya Pant <[email protected]>
---
.../ABI/testing/sysfs-devices-platform-trackpoint | 115 +++++++++++++++++++++
1 file changed, 115 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-devices-platform-trackpoint
diff --git a/Documentation/ABI/testing/sysfs-devices-platform-trackpoint b/Documentation/ABI/testing/sysfs-devices-platform-trackpoint
new file mode 100644
index 000000000000..df11901a6b3d
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-devices-platform-trackpoint
@@ -0,0 +1,115 @@
+What: /sys/devices/platform/i8042/.../sensitivity
+Date: Aug, 2005
+KernelVersion: 2.6.14
+Contact: [email protected]
+Description:
+ (RW) Trackpoint sensitivity.
+
+What: /sys/devices/platform/i8042/.../intertia
+Date: Aug, 2005
+KernelVersion: 2.6.14
+Contact: [email protected]
+Description:
+ (RW) Negative inertia factor. High values cause the cursor to
+ snap backward when the trackpoint is released.
+
+What: /sys/devices/platform/i8042/.../reach
+Date: Aug, 2005
+KernelVersion: 2.6.14
+Contact: [email protected]
+Description:
+ (RW) Backup range for z-axis press.
+
+What: /sys/devices/platform/i8042/.../draghys
+Date: Aug, 2005
+KernelVersion: 2.6.14
+Contact: [email protected]
+Description:
+ (RW) The drag hysteresis controls how hard it is to drag with
+ z-axis pressed.
+
+What: /sys/devices/platform/i8042/.../mindrag
+Date: Aug, 2005
+KernelVersion: 2.6.14
+Contact: [email protected]
+Description:
+ (RW) Minimum amount of force needed to trigger dragging.
+
+What: /sys/devices/platform/i8042/.../speed
+Date: Aug, 2005
+KernelVersion: 2.6.14
+Contact: [email protected]
+Description:
+ (RW) Speed of the trackpoint cursor.
+
+What: /sys/devices/platform/i8042/.../thresh
+Date: Aug, 2005
+KernelVersion: 2.6.14
+Contact: [email protected]
+Description:
+ (RW) Minimum value for z-axis force required to trigger a press
+ or release, relative to the running average.
+
+What: /sys/devices/platform/i8042/.../upthresh
+Date: Aug, 2005
+KernelVersion: 2.6.14
+Contact: [email protected]
+Description:
+ (RW) The offset from the running average required to generate a
+ select (click) on z-axis on release.
+
+What: /sys/devices/platform/i8042/.../ztime
+Date: Aug, 2005
+KernelVersion: 2.6.14
+Contact: [email protected]
+Description:
+ (RW) This attribute determines how sharp a press has to be in
+ order to be recognized.
+
+What: /sys/devices/platform/i8042/.../jenks
+Date: Aug, 2005
+KernelVersion: 2.6.14
+Contact: [email protected]
+Description:
+ (RW) Minimum curvature in degrees required to generate a double
+ click without a release.
+
+What: /sys/devices/platform/i8042/.../skipback
+Date: Aug, 2005
+KernelVersion: 2.6.14
+Contact: [email protected]
+Description:
+ (RW) When the skipback bit is set, backup cursor movement during
+ releases from drags will be suppressed. The default value for
+ this bit is 0.
+
+What: /sys/devices/platform/i8042/.../ext_dev
+Date: Aug, 2005
+KernelVersion: 2.6.14
+Contact: [email protected]
+Description:
+ (RW) Disable (0) or enable (1) external pointing device.
+
+What: /sys/devices/platform/i8042/.../press_to_select
+Date: Aug, 2005
+KernelVersion: 2.6.14
+Contact: [email protected]
+Description:
+ (RW) Writing a value of 1 to this file will enable the Press to
+ Select functions like tapping the control stick to simulate a
+ left click, and writing 0 will disable it.
+
+What: /sys/devices/platform/i8042/.../drift_time
+Date: Dec, 2014
+KernelVersion: 3.19
+Contact: [email protected]
+Description:
+ (RW) This parameter controls the period of time to test for a
+ ‘hands off’ condition (i.e. when no force is applied) before a
+ drift (noise) calibration occurs.
+
+ IBM Trackpoints have a feature to compensate for drift by
+ recalibrating themselves periodically. By default, if for 0.5
+ seconds there is no change in position, it's used as the new
+ zero. This duration is too low. Often, the calibration happens
+ when the trackpoint is in fact being used.
--
2.16.2
On Fri, 2 Mar 2018 23:00:19 +0530
Aishwarya Pant <[email protected]> wrote:
> Descriptions have been collected from git commit logs, code commits and
> the TrackPoint System Version 4.0 Engineering Specification.
Applied to the docs tree, thanks.
jon