Re: Using gpio_keys with regmapped gpio?

[Dmitry Torokhov <dmitry.torokhov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

On Tue, Mar 31, 2015 at 02:57:35PM -0500, Thor Thayer wrote:
> Hi,
> 
> I have a SPI gpio expander chip that is using the regmap framework.
> There are some pushbuttons that I'd like to use the gpio_keys
> framework for but only the first button press creates an input
> event.
> 
> It seems like my problem occurs because I'm only getting events on a
> button press.  The input_get_disposition() function toggles a local
> copy of the button state [__change_bit(code, dev->key);] in the
> input.c file. I think this function also needs to be called when the
> button is released to toggle the dev->key state and re-arm for the
> next button press.

Yes.

> 
> I tried enabling autorepeat but that causes an infinite loop in the
> input_repeat_key() function.
> 
> In both cases, it seems like the button press condition must be
> cleared when the button is released. This seems like it should be
> common for all GPIOs so I'm probably missing something.

It sounds like your expander does not generate interrupt when the button
is released and so gpio-keys driver is not aware of it.

Thanks.

-- 
Dmitry
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