Messages in this thread | | | From | Carl Worth <> | Subject | wacom: Fixes for stylus pressure values for Thinkpad Yoga | Date | Wed, 26 Feb 2014 14:38:13 -0800 |
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This series of patches fixes the pressure values reported for the wacom tablet built-in to a Lenovo ThinkPad Yoga laptop. Prior to this patch series, if I slowly increased stylus pressure, (expecting a gradual increase of values from 0 to 1023), I instead received values that increased slowly to 255, then reset to 0 and increased slowly again, etc.
The buggy arithmetic that is updated here appears to exist in identical forms for other drivers. I did not update any code that I was not able to test directly. But it looks like wacom_pl_irq and wacom_dtu_irq potentially have similar bugs, (depending on the actual pressure_max values encountered in practice).
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