Hi Dmitry, On Fri, Jun 27, 2025, at 2:14 PM, Dmitry Torokhov wrote: > Hi Vishnu, > > On Fri, Jun 20, 2025 at 09:42:08AM +0900, Vishnu Sankar wrote: >> Newer ThinkPads have a doubletap feature that needs to be turned >> ON/OFF via the trackpoint registers. >> Systems released from 2023 have doubletap disabled by default and >> need the feature enabling to be useful. >> >> This patch introduces support for exposing and controlling the >> trackpoint doubletap feature via a sysfs attribute. >> /sys/devices/platform/thinkpad_acpi/tp_doubletap >> This can be toggled by an "enable" or a "disable". >> >> With this implemented we can remove the masking of events, and rely on >> HW control instead, when the feature is disabled. >> >> Note - Early Thinkpads (pre 2015) used the same register for hysteris >> control, Check the FW IDs to make sure these are not affected. >> >> trackpoint.h is moved to linux/input/. > > No, please keep everything private to trackpoint.c and do not involve > thinkpad_acpi driver. By doing so you are introducing unwanted > dependencies (for both module loading, driver initialization, and > operation) and unsafe use of non-owned pointers/dangling pointers, etc. >
Do you have recommendations on how to handle this case then? This is a Thinkpad specific feature and hence the logic for involving thinkpad_acpi. There are Thinkpad hotkeys that will enable/disable the trackpoint doubletap feature - so there is some linkage. I'm not sure how to avoid that. Is there a cleaner way to do this that you'd recommend we look at using? It's a feature (albeit a minor one) on the laptops that we'd like to make available to Linux users. Mark _______________________________________________ ibm-acpi-devel mailing list ibm-acpi-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ibm-acpi-devel
