linux-kernel - Disable input device

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Message-Id: <201411291824.03996@pali>
Date:	Sat, 29 Nov 2014 18:24:03 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Sebastian Reichel <sre@...nel.org>,
	Pavel Machek <pavel@....cz>,
	kernel list <linux-kernel@...r.kernel.org>,
	linux-input@...r.kernel.org, Henrik Rydberg <rydberg@...omail.se>
Subject: Disable input device

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).

Or do you prefer something other?

-- 
Pali Rohár
pali.rohar@...il.com

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