This patch series adds support for TrackPoint doubletap with a clear and
simple separation of responsibilities between drivers:

1. Firmware enablement (trackpoint.c):
   Automatically enables doubletap on capable hardware during device
   detection.

2. User control (thinkpad_acpi.c):
   Provides a sysfs interface to enable or disable delivery of doubletap
   events to userspace.

The approach follows the KISS principle:
- The TrackPoint driver enables hardware functionality by default.
- The thinkpad_acpi driver controls whether ACPI doubletap events are
  delivered, using existing hotkey filtering infrastructure.
- No cross-driver APIs or dual filtering paths are introduced.

Changes in v5:
- Rename sysfs attribute from doubletap_filter to doubletap_enable to
  reflect actual behavior.
- Fix inverted logic so events are delivered only when doubletap is
  enabled.
- Suppress ACPI hotkey delivery instead of injecting or filtering input
  events.
- Register the sysfs attribute via hotkey_attributes[] instead of
  device_create_file().
- Drop unnecessary helper wrappers and debug logging.
- Update Documentation to reflect the new naming and semantics.

Changes in v4:
- Complete redesign based on reviewer feedback.
- trackpoint.c: Simplified to only enable doubletap by default.
- trackpoint.c: Removed all sysfs attributes and global variables.
- trackpoint.c: Uses firmware ID detection with deny list.
- thinkpad_acpi.c: Added sysfs interface for kernel-level event control.
- thinkpad_acpi.c: No cross-driver dependencies.
- Documentation: Updated to reflect simplified sysfs approach.

Changes in v3:
- No changes.

Changes in v2:
- Improved commit messages.
- Removed unnecessary comments and debug messages.
- Switched to strstarts() usage.
- Simplified firmware capability detection logic.

This version addresses the remaining review feedback by correcting the
naming and logic inversion, aligning sysfs semantics with behavior, and
fully integrating with existing thinkpad_acpi hotkey handling.

Vishnu Sankar (3):
  input: trackpoint - Enable doubletap by default on capable devices
  platform/x86: thinkpad_acpi: Add sysfs control for TrackPoint
    double-tap
  Documentation: thinkpad-acpi - Document doubletap_enable attribute

 .../admin-guide/laptops/thinkpad-acpi.rst     | 20 ++++++++
 drivers/input/mouse/trackpoint.c              | 47 +++++++++++++++++++
 drivers/input/mouse/trackpoint.h              |  5 ++
 drivers/platform/x86/lenovo/thinkpad_acpi.c   | 42 ++++++++++++++---
 4 files changed, 107 insertions(+), 7 deletions(-)

-- 
2.51.0

Hi All,

I’m writing to kindly follow up on the patch series I have submitted.

I haven’t seen any review feedback yet, so I just wanted to check if it might
have been missed in the queue. If there’s anything I should revise, test, or
clarify, I’d be happy to provide it.

Thank you for your time, and sorry for the inconvenience.

On Sat, Dec 27, 2025 at 8:53 AM Vishnu Sankar <vishnuocv@gmail.com> wrote:
>
> This patch series adds support for TrackPoint doubletap with a clear and
> simple separation of responsibilities between drivers:
>
> 1. Firmware enablement (trackpoint.c):
>    Automatically enables doubletap on capable hardware during device
>    detection.
>
> 2. User control (thinkpad_acpi.c):
>    Provides a sysfs interface to enable or disable delivery of doubletap
>    events to userspace.
>
> The approach follows the KISS principle:
> - The TrackPoint driver enables hardware functionality by default.
> - The thinkpad_acpi driver controls whether ACPI doubletap events are
>   delivered, using existing hotkey filtering infrastructure.
> - No cross-driver APIs or dual filtering paths are introduced.
>
> Changes in v5:
> - Rename sysfs attribute from doubletap_filter to doubletap_enable to
>   reflect actual behavior.
> - Fix inverted logic so events are delivered only when doubletap is
>   enabled.
> - Suppress ACPI hotkey delivery instead of injecting or filtering input
>   events.
> - Register the sysfs attribute via hotkey_attributes[] instead of
>   device_create_file().
> - Drop unnecessary helper wrappers and debug logging.
> - Update Documentation to reflect the new naming and semantics.
>
> Changes in v4:
> - Complete redesign based on reviewer feedback.
> - trackpoint.c: Simplified to only enable doubletap by default.
> - trackpoint.c: Removed all sysfs attributes and global variables.
> - trackpoint.c: Uses firmware ID detection with deny list.
> - thinkpad_acpi.c: Added sysfs interface for kernel-level event control.
> - thinkpad_acpi.c: No cross-driver dependencies.
> - Documentation: Updated to reflect simplified sysfs approach.
>
> Changes in v3:
> - No changes.
>
> Changes in v2:
> - Improved commit messages.
> - Removed unnecessary comments and debug messages.
> - Switched to strstarts() usage.
> - Simplified firmware capability detection logic.
>
> This version addresses the remaining review feedback by correcting the
> naming and logic inversion, aligning sysfs semantics with behavior, and
> fully integrating with existing thinkpad_acpi hotkey handling.
>
> Vishnu Sankar (3):
>   input: trackpoint - Enable doubletap by default on capable devices
>   platform/x86: thinkpad_acpi: Add sysfs control for TrackPoint
>     double-tap
>   Documentation: thinkpad-acpi - Document doubletap_enable attribute
>
>  .../admin-guide/laptops/thinkpad-acpi.rst     | 20 ++++++++
>  drivers/input/mouse/trackpoint.c              | 47 +++++++++++++++++++
>  drivers/input/mouse/trackpoint.h              |  5 ++
>  drivers/platform/x86/lenovo/thinkpad_acpi.c   | 42 ++++++++++++++---
>  4 files changed, 107 insertions(+), 7 deletions(-)
>
> --
> 2.51.0
>


-- 

Regards,

      Vishnu Sankar
     +817015150407 (Japan)