Re: [PATCH 1/2] Input: gpio_keys - Also send release events for ABS codes

From: Paul Cercueil
Date: Sat Nov 05 2016 - 07:58:26 EST

On 03/11/2016 17:21, Dmitry Torokhov wrote:
On Tue, Nov 01, 2016 at 11:25:03AM +0100, Paul Cercueil wrote:
Right now, the gpio-keys driver is mostly used with EV_KEY event types.
However, this driver (and its devicetree bindings) support specifying
a different input type, like EV_ABS, even though this doesn't work in
practice: "key pressed" events are correctly received and treated, but
"key released" are silently ignored.

With this commit, keys configured as EV_ABS will inject an event with
the value 0 when released.
No, this will break setups like this:

gpio0 - ABS_X - 0
gpio1 - ABS_X - 1
gpio2 - ABS_X - 2
gpio7 - ABS_X - 7

- something like a slider built on top of gpios.

So what would you suggest for the implementation of a hat / d-pad on top of GPIOs?

- Paul