linux-kernel - RE: [PATCH] input: Add sysfs interface to on/off state of GPIO keys and switches

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Date:	Thu, 11 Nov 2010 06:24:21 -0800
From:	"Lighthart, EricX" <ericx.lighthart@...el.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	"dmitry.torokhov@...il.com" <dmitry.torokhov@...il.com>,
	"pb@...dhelds.org" <pb@...dhelds.org>,
	"ext-mika.1.westerberg@...ia.com" <ext-mika.1.westerberg@...ia.com>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] input: Add sysfs interface to on/off state of GPIO	keys
 and switches

There's the already-existing solution I was looking for.
Thanks Mark.

Dmitry, et al, please withdraw the patch.

> -----Original Message-----
> From: Mark Brown [mailto:broonie@...nsource.wolfsonmicro.com]
> Sent: Thursday, November 11, 2010 6:16 AM
> To: Lighthart, EricX
> Cc: dmitry.torokhov@...il.com; pb@...dhelds.org; ext-
> mika.1.westerberg@...ia.com; linux-input@...r.kernel.org; linux-
> kernel@...r.kernel.org
> Subject: Re: [PATCH] input: Add sysfs interface to on/off state of GPIO
> keys and switches
> 
> On Thu, Nov 11, 2010 at 06:03:35AM -0800, Lighthart, EricX wrote:
> > User space cannot learn the current state of a GPIO key or switch.
> > Input system reports only changes, not state.
> >
> > Add two sysfs attributes, one each for keys and switches, that
> > report lists of keys or switches currently "on."
> 
> There's EVIOCG* ioctl()s for this.  Something sysfs (or a widely
> distributed utility) would be very helpful but there is actually a
> facility to read the state.
> 
> >  drivers/input/keyboard/gpio_keys.c |   68
> ++++++++++++++++++++++++++++--------
> 
> If something is needed here it should be done as part of the input
> layer, not in a driver specific fashion - there's nothing specific to
> GPIO keys here.
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