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Wed, 11 Mar 2026 07:34:47 -0700 (PDT) Received: from c12-ThinkPad-X1-Carbon-Gen-12 ([2400:2410:5f2b:700:dd5:d7ff:1c94:3624]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2aeae34e070sm26399235ad.48.2026.03.11.07.34.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Mar 2026 07:34:46 -0700 (PDT) From: Vishnu Sankar To: mpearson-lenovo@squebb.ca, dmitry.torokhov@gmail.com, hmh@hmh.eng.br, hansg@kernel.org, corbet@lwn.net, derekjohn.clark@gmail.com, ilpo.jarvinen@linux.intel.com Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, ibm-acpi-devel@lists.sourceforge.net, linux-doc@vger.kernel.org, platform-driver-x86@vger.kernel.org, vsankar@lenovo.com, Vishnu Sankar Subject: [PATCH v8 0/3] TrackPoint doubletap enablement and user control Date: Wed, 11 Mar 2026 23:31:41 +0900 Message-ID: <20260311143144.482145-1-vishnuocv@gmail.com> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 v8: - Added linux/array_size.h and linux/strings.h to the include lists for ARRAY_SIZE() and strstarts() respectively. - Better formatting. - Fix indentation in doubletap_enable sysfs documentation. Changes in v7: - Removed unwanted comments and logs Changes in v6: - Documentation: fix formatting of the doubletap_enable sysfs attribute description (separate "Values" list) 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 | 21 +++++++++ drivers/input/mouse/trackpoint.c | 46 +++++++++++++++++++ drivers/input/mouse/trackpoint.h | 5 ++ drivers/platform/x86/lenovo/thinkpad_acpi.c | 42 ++++++++++++++--- 4 files changed, 107 insertions(+), 7 deletions(-) -- 2.51.0