A KYE EasyPen M406 diagnostics was obtained and a kernel driver needs to be implemented.
The diagnostic dumps are available in the devices repo: http://digimend.git.sourceforge.net/git/gitweb.cgi?p=digimend/devices.git;a=tree;f=KYE_EasyPen_M406
However, the way frame controls are reported is incompatible with the HID standard: the mode doesn't affect the way the wheel rotation is reported, but is just reported with a separate report ID. This requires creating a synthetic input device aggregating both wheel mode and rotation reports.
A compromise would be to first implement a driver supporting pen only.
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