Re: [PATCH] Input: Document the device properties

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On 01/30/2012 10:35 AM, Henrik Rydberg wrote:

+INPUT_PROP_BUTTONPAD:
+--------------------
+For touchpads where the button is placed under the touchpad, such as
+clickpads and macbooks, this property should be set. Common in devices from
+2009 and onwards.

"Under" can be interpreted to mean "under as in towards the user when looking from above" as well as "under as in towards the Earth's core". A more unambiguous description would be something like "For touchpads where a physical button is beneath the pad's touch surface so that pushing down on the touchpad causes a button click".

+INPUT_PROP_SEMI_MT:
+------------------
+Some touchpads, most common between 2008 and 2011, can detect the presence
+of multiple contacts without resolving the individual positions; only the
+number of contacts and the corresponding bounding box is known. For such
+touchpads, the semi-mt property should be set.

A "corresponding bounding box" usually means "a bounding box that contains all touches on the touchpad". I've been told (though I have not checked it myself) that there are devices that don't do this. They only report a bounding box for some subset of touches. If this is the case, it should be documented here.
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