linux-kernel - Touch processing on host CPU

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Date:	Fri, 17 Oct 2014 11:42:10 +0100
From:	Nick Dyer <nick.dyer@...ev.co.uk>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Greg KH <greg@...ah.com>, Jonathan Cameron <jic23@...nel.org>
CC:	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Touch processing on host CPU

Hi-

I'm trying to find out which subsystem maintainer I should be talking to -
apologies if I'm addressing the wrong people.

There is a model for doing touch processing where the touch controller
becomes a much simpler device which sends out raw acquisitions (over SPI 
at up to 1Mbps + protocol overheads). All touch processing is then done in
user space by the host CPU. An example of this is NVIDIA DirectTouch - see:
http://blogs.nvidia.com/blog/2012/02/24/industry-adopts-nvidia-directtouch/

In the spirit of "upstream first", I'm trying to figure out how to get a
driver accepted. Obviously it's not an input device in the normal sense. Is
it acceptable just to send the raw touch data out via a char device? Is
there another subsystem which is a good match (eg IIO)? Does the protocol
(there is ancillary/control data as well) need to be documented?

cheers

-- 
Nick Dyer
Senior Software Engineer, ITDev
Fully Managed Technology Design Services
+44 (0)23 80988855  -  http://www.itdev.co.uk

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