linux-kernel - Re: tsc2005 touchscreen: implement disable attribute

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Message-Id: <201411101014.25873@pali>
Date:	Mon, 10 Nov 2014 10:14:23 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Sebastian Reichel <sre@...nel.org>, Pavel Machek <pavel@....cz>,
	kernel list <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel" <linux-arm-kernel@...ts.infradead.org>,
	linux-omap@...r.kernel.org, tony@...mide.com, khilman@...nel.org,
	aaro.koskinen@....fi, freemangordon@....bg, B38611@...escale.com,
	jg1.han@...sung.com, linux-input@...r.kernel.org
Subject: Re: tsc2005 touchscreen: implement disable attribute

On Sunday 09 November 2014 21:01:42 Dmitry Torokhov wrote:
> On Sun, Nov 09, 2014 at 01:49:19PM +0100, Pali Rohár wrote:
> > On Sunday 09 November 2014 13:40:25 Sebastian Reichel wrote:
> > > Hi,
> > > 
> > > On Sun, Nov 09, 2014 at 12:56:37PM +0100, Pavel Machek 
wrote:
> > > > Implement disable attribute for tsc2005 touchscreen. It
> > > > is useful to avoid wakeups when phone is in the pocket.
> > > 
> > > I don't think this should be some driver specific sysfs
> > > node. Instead a generic method from the input subsystem
> > > should be used.
> > > 
> > > -- Sebastian
> > 
> > Yes. I would like to see generic method to turn off input
> > device (or just "mute" it if device does not support turn
> > off). Similar problem is also on laptops or other portable
> > devices. E.g when I close LID of my laptop I want to turn
> > off internal input devices (keyboard, touchpad, trackstick)
> > without need to unload evdev Xserver drivers (or killing
> > Xserver). Another use case is to turn off keyboard (also
> > from kernel tty on Ctrl+Alt+Fx) which cannot be unplugged
> > (internal laptop keyboard).
> > 
> > CCed Dmitry, what do you think about it?
> 
> Actually I'd like it to be not limited to input devices but
> rater try doing it at the device core level, if possible. I
> am sure there are IIO and other devices that could be
> forcibly turned off/put into low power mode under certain
> circumstances.
> 
> There were some talks about it with Rafael, but we never come
> with anything concrete.
> 
> Thanks.

Ok. What about adding sysfs node disable which accept value 0/1?

-- 
Pali Rohár
pali.rohar@...il.com

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