ABS_MT_TOUCH_MAJOR metric

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Hi,

What is the metric of ABS_MT_TOUCH_MAJOR / ABS_MT_WIDTH_MAJOR events?

The Linux documentation
<https://www.kernel.org/doc/Documentation/input/multi-touch-protocol.txt> says:
"The length of the major axis of the contact. The length should be given
in surface units. ..."

What does "surface units" means, is it millimeter or pixels?

-- 

Thanks,
ferruh

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