On Mon, 6 Mar 2017, hn.chen@xxxxxxxxxxxxxxx wrote: > From: HungNien Chen <hn.chen@xxxxxxxxxxxxxxx> > > Just quote from Jonathan Clarke in previous thread(2017/01/24): > "This division by 2 was added along with the touch width/height > fields 6 years ago so that those fields 'match the visual scale > of the touch' for a specific device (3M PCT)" > "The scaling is also discarding information about touch size > (1 bit for each of width/height) which is useful for any > application that wants to know about it." > > Jonathan mentioned just what I thought in a new project recently. > It dosen't make sense to discard 1 bit width/height in general > case according to the spec in multi-touch-protocol.txt so > I would like to make a slight change here. > > A quirk MT_QUIRK_TOUCH_SIZE_SCALING was added to service > devices like 3M PCT with a special visual scale and > the division by 2 only take effect with devices like that. I've reformatted the changelog a bit and applied to for-4.12/multitouch. Thanks, -- Jiri Kosina SUSE Labs -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
