linux-kernel - Re: Disable input device

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Message-ID: <20141206124708.GA17289@amd>
Date:	Sat, 6 Dec 2014 13:47:08 +0100
From:	Pavel Machek <pavel@....cz>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Sebastian Reichel <sre@...nel.org>,
	kernel list <linux-kernel@...r.kernel.org>,
	linux-input@...r.kernel.org, Henrik Rydberg <rydberg@...omail.se>
Subject: Re: Disable input device

On Sat 2014-11-29 18:24:03, Pali Rohár wrote:
> Hello,
> 
> there is request to introduce some option (via sysfs) to disable 
> one input device. Originally it was for tsc2005 touchscreen found 
> on Nokia N900 cellphone. Use case is to completely disable 
> touchscreen when phone is in pocket or when screen is locked via 
> slide switch (to prevent random clicks).
> 
> But it would be better to have disable option for all input 
> devices. Sometimes input device is not use and only consume 
> power. Another case is when input device (e.g. keyboard or 
> touchpad) is integrated into machine (e.g. on laptops) and user 
> does not want to use it (so make sure that kernel does not send 
> events to userspace).
> 
> I would like to ask, how to solve it?
> 
> What do you think about adding new sysfs file "disable" (accept 
> values 1 or 0) for every input device? With "1" it cause that 
> kernel will drop all events from specific input device and if 
> driver provide some function is can be called (e.g. for power 
> management or disabling device at hardware level).

That makes sense to me. Dmitry, would such interface be acceptable?

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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