Re: [PATCH] input: Add sysfs interface to on/off state of GPIOkeys and switches

[Mark Brown]

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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