linux-kernel - Re: [RFC v2] input: Introduce device information ioctl

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Date:	Thu, 16 Dec 2010 15:18:17 +0100
From:	Henrik Rydberg <rydberg@...omail.se>
To:	Peter Hutterer <peter.hutterer@...-t.net>
CC:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Jiri Kosina <jkosina@...e.cz>, Ping Cheng <pingc@...om.com>,
	Chris Bagwell <chris@...bagwell.com>,
	Chase Douglas <chase.douglas@...onical.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC v2] input: Introduce device information ioctl


>>  /*
>> + * Device properties and quirks
>> + */
>> +
>> +#define INPUT_PROP_POINTER		0x00	/* needs a pointer */
>> +#define INPUT_PROP_DIRECT		0x01	/* direct object manipulation */
> 
> fwiw, I think the common term for these is "direct input devices", at least
> that's how a lot of the research literature refers to them. Might be good to
> use the same term.


Changed, thanks.


> either way, not sure about this one.  I've worked with devices that were
> indirect by nature but used directly. e.g. the magic touchpad could quite
> easily be used as direct input device with an top-down projector. the
> decision to use it as an indirect device is a UI decision.
> Likewise, some mountable direct-touch touchscreens can be used indirectly if
> the touchscreen isn't mounted straight on the display. This is very much a
> setup-specific property and I'm not sure about the value of this
> information.


As Dmitry stated already, this is foremost for automatic setup. The idea to
elevate these properties to the main configuration source is also interesting.

Thanks,
Henrik
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