linux-kernel - Re: [PATCH v2] Input: evdev - Add EVIOC mechanism to extract the MT slot state

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Date:	Fri, 6 Jan 2012 20:48:15 +0100
From:	"Henrik Rydberg" <rydberg@...omail.se>
To:	Chase Douglas <chase.douglas@...onical.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Benjamin Tissoires <benjamin.tissoires@...il.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] Input: evdev - Add EVIOC mechanism to extract the MT
 slot state

> > Ok, maybe not to so easy after all, which probably answers my own
> > question. Looks like a EVIOCGMTSLOT, taking both slot and event code
> > as argument, would be the cleaner route to take. Another ioctl, how do we
> > feel about that?
> 
> What's the problem with userspace locking?

The idea was to get by without it.

Regarding ioctls, it does not seem realizable due to ioctl number
exhaustion. A sysfs interface for all EV_ABS and per-slot MT values
could be a more future-proof alternative.

Henrik
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