Re: [PATCH v1] Input: rotary-encoder - Add gpio as push button

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

On Fri, Jun 14, 2019 at 04:51:58PM +0200, Maxime Ripard wrote:
> Hi Mylene,
> 
> On Fri, Jun 14, 2019 at 03:36:51PM +0200, Mylène Josserand wrote:
> > Add the support of a gpio that can be defined as a push button.
> > Thanks to that, it is possible to emit a keycode in case of a
> > "push" event, if the rotary supports that.
> >
> > The keycode to emit is defined using "linux,code" property
> > (such as in gpio-keys).
> >
> > Signed-off-by: Mylène Josserand <mylene.josserand@bootlin.com>
> > ---
> >  .../devicetree/bindings/input/rotary-encoder.txt   |  5 +++
> >  drivers/input/misc/rotary_encoder.c                | 50 ++++++++++++++++++++++
> >  2 files changed, 55 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/input/rotary-encoder.txt b/Documentation/devicetree/bindings/input/rotary-encoder.txt
> > index a644408b33b8..1cfce5d0b5c4 100644
> > --- a/Documentation/devicetree/bindings/input/rotary-encoder.txt
> > +++ b/Documentation/devicetree/bindings/input/rotary-encoder.txt
> > @@ -22,6 +22,9 @@ Optional properties:
> >  - wakeup-source: Boolean, rotary encoder can wake up the system.
> >  - rotary-encoder,encoding: String, the method used to encode steps.
> >    Supported are "gray" (the default and more common) and "binary".
> > +- push-gpio: a gpio to be used as a detection of a push from the rotary.
> 
> According to Documentation/devicetree/bindings/gpio/gpio.txt, GPIO
> properties with a -gpio suffix are now deprecated in favor of the
> -gpios suffix.
> 
> > +- linux,code: keycode to emit with the push-gpio of this rotary encoder.
> > +  Required property in case "push-gpio"'s one is used.
> 
> I guess we should make it clear in the property name that it's the
> keycode emitted at push. Otherwise, it will be ambiguous between the
> rotary itself, or the button.

Also, I am pretty sure someone will come up with a switch instead of a
button shortly after ;) so I think we should have an event type there as
well.

Thanks.

-- 
Dmitry