Re: Touch processing on host CPU

[Jonathan Cameron]

On October 17, 2014 11:42:10 AM GMT+01:00, Nick Dyer <nick.dyer@xxxxxxxxxxx> wrote:
>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)?

Possibly... 
> Does the
>protocol
>(there is ancillary/control data as well) need to be documented?

Do you know of a suitable ADC frontend?  Preferably with docs. Interesting bit is the
 data format and these ancillary parts.
>
>cheers

-- 
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