linux-kernel - Re: [PATCH v2] Documentation: Add evdev type and code definitions

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Date:	Fri, 07 Jan 2011 17:36:57 -0500
From:	Chase Douglas <chase.douglas@...onical.com>
To:	Nikolai Kondrashov <spbnick@...il.com>
CC:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Henrik Rydberg <rydberg@...omail.se>,
	Chris Bagwell <chris@...bagwell.com>,
	Peter Hutterer <peter.hutterer@...-t.net>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] Documentation: Add evdev type and code definitions

On 01/07/2011 05:26 PM, Nikolai Kondrashov wrote:
> On 01/08/2011 01:15 AM, Chase Douglas wrote:
>> Hmm.. That seems incorrect to me. Why wouldn't it follow the behavior
>> outlined above?
> Because the tablet doesn't report when the tool enters/leaves the proximity.
> It just starts/stops sending the coordinates.
> 
> A leave timer could be used, though. Maybe we could ignore the case when the
> mouse is laying still on the tablet or the pen is held very steadily in
> place and just tell that tool left the surface.
> 
> Maybe it will be beneficial to have it synthesised after all, as it would
> probably ease the integration with xf86-input-wacom and will keep the evdev
> protocol more consistent.

I think I understand now, and it sounds pretty broken :). Do we want to
codify such behaviour, or leave it out as a special case? I don't see
this document as a definitive guide to evdev usage and driver
development, just a reference and best practices guide, so I'm inclined
to say the latter.

-- Chase
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