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