linux-kernel - Re: [PATCH v3 0/8] Input: atmel_mxt_ts - output raw touch diagnostic data via V4L

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Date:	Wed, 1 Jun 2016 11:17:00 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Nick Dyer <nick.dyer@...ev.co.uk>
Cc:	Hans Verkuil <hverkuil@...all.nl>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Benson Leung <bleung@...omium.org>,
	Alan Bowens <Alan.Bowens@...el.com>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Chris Healy <cphealy@...il.com>,
	Henrik Rydberg <rydberg@...math.org>,
	Andrew Duggan <aduggan@...aptics.com>,
	James Chen <james.chen@....com.tw>,
	Dudley Du <dudl@...ress.com>,
	Andrew de los Reyes <adlr@...omium.org>,
	sheckylin@...omium.org, Peter Hutterer <peter.hutterer@...-t.net>,
	Florian Echtler <floe@...terbrot.org>, mchehab@....samsung.com
Subject: Re: [PATCH v3 0/8] Input: atmel_mxt_ts - output raw touch diagnostic
 data via V4L

On Wed, Jun 01, 2016 at 05:39:44PM +0100, Nick Dyer wrote:
> This is a series of patches to add diagnostic data support to the Atmel
> maXTouch driver. It's a rewrite of the previous implementation which output via
> debugfs: it now uses a V4L2 device in a similar way to the sur40 driver.
> 
> There are significant performance advantages to putting this code into the
> driver.  The algorithm for retrieving the data has been fairly consistent
> across a range of chips, with the exception of the mXT1386 series (see patch).
> 
> We have a utility which can read the data and display it in a useful format:
>     https://github.com/ndyer/heatmap/commits/heatmap-v4l
> 
> These patches are also available from
>     https://github.com/ndyer/linux/commits/diagnostic-v4l
> 
> Changes in v3:
> - Address V4L2 review comments from Hans Verkuil
> - Run v4l-compliance and fix all issues - needs minor patch here:
>   https://github.com/ndyer/v4l-utils/commit/cf50469773f
> 
> Changes in v2:
> - Split pixfmt changes into separate commit and add DocBook
> - Introduce VFL_TYPE_TOUCH_SENSOR and /dev/v4l-touch
> - Remove "single node" support for now, it may be better to treat it as metadata later
> - Explicitly set VFL_DIR_RX
> - Fix Kconfig
> 

I do not have any objections other than some nits form the input side;
majority of the review should come from V4L2 side here...

-- 
Dmitry