Messages in this thread | | | Date | Thu, 10 Jun 2010 15:56:34 +0200 | From | Pavel Machek <> | Subject | Re: [PATCH 2/2] input: mt: Document the MT event slot protocol (rev4) |
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Hi!
> +Protocol Example A > +------------------ > + > +Here is what a minimal event sequence for a two-contact touch would look > +like for a type A device: > + > + ABS_MT_POSITION_X x[0] > + ABS_MT_POSITION_Y y[0] > + SYN_MT_REPORT > + ABS_MT_POSITION_X x[1] > + ABS_MT_POSITION_Y y[1] > + SYN_MT_REPORT > + SYN_REPORT ... > -Usage > ------ > +Here is the sequence after lifting the first contact: > + > + ABS_MT_POSITION_X x[1] > + ABS_MT_POSITION_Y y[1] > + SYN_MT_REPORT > + SYN_REPORT
...
> +Protocol Example B > +------------------ > + > +Here is what a minimal event sequence for a two-contact touch would look > +like for a type B device: > + > + ABS_MT_SLOT 0 > + ABS_MT_TRACKING_ID 45 > + ABS_MT_POSITION_X x[0] > + ABS_MT_POSITION_Y y[0] > + ABS_MT_SLOT 1 > + ABS_MT_TRACKING_ID 46 > + ABS_MT_POSITION_X x[1] > + ABS_MT_POSITION_Y y[1] > + SYN_REPORT > + > +Here is the sequence after moving contact 45 in the x direction: > + > + ABS_MT_SLOT 0 > + ABS_MT_POSITION_X x[0] > + SYN_REPORT
With this proposed system, protocol A is *very* different from protocol B. Is there way to make them more similar? -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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