Re: [PATCH v5 2/4] Input: joystick: xpad: Add ABS_PROFILE axis value to uapi

[Peter Hutterer <peter.hutterer@who-t.net>]

On Thu, Sep 08, 2022 at 08:51:57AM +0200, Benjamin Tissoires wrote:
> On Thu, Sep 8, 2022 at 7:36 AM Dmitry Torokhov
> <dmitry.torokhov@gmail.com> wrote:
> >
> > On Wed, Sep 07, 2022 at 05:41:08PM +0200, Bastien Nocera wrote:
> > > On Mon, 2022-08-29 at 12:07 -0700, Nate Yocom wrote:
> > > > On Sat, Aug 27, 2022 at 12:40:46PM +0200, Bastien Nocera wrote:
> > > > > On Thu, 2022-08-25 at 15:24 -0700, Nate Yocom wrote:
> > > > > > Add an ABS_PROFILE axis for input devices which need it, e.g. X-
> > > > > > Box
> > > > > > Adaptive Controller and X-Box Elite 2.
> > > > > > ---
> > > > > >  include/uapi/linux/input-event-codes.h | 1 +
> > > > > >  1 file changed, 1 insertion(+)
> > > > > >
> > > > > > diff --git a/include/uapi/linux/input-event-codes.h
> > > > > > b/include/uapi/linux/input-event-codes.h
> > > > > > index dff8e7f17074..7ad931a32970 100644
> > > > > > --- a/include/uapi/linux/input-event-codes.h
> > > > > > +++ b/include/uapi/linux/input-event-codes.h
> > > > > > @@ -862,6 +862,7 @@
> > > > > >  #define ABS_TOOL_WIDTH         0x1c
> > > > > >
> > > > > >  #define ABS_VOLUME             0x20
> > > > > > +#define ABS_PROFILE            0x21
> > > > > >
> > > > > >  #define ABS_MISC               0x28
> > > > > >
> > > > >
> > > > >
> > > > > You probably also want to add it to the absolutes array in
> > > > > drivers/hid/hid-debug.c.
> > > >
> > > > doh, roger.
> > > >
> > > > > Again, you might want to wait for confirmation from Dmitry that
> > > > > this is
> > > > > the right way to do this for the profiles.
> > > >
> > > > Makes sense.  Dmitry?
> > >
> > > Dmitry, could you please confirm whether ABS_PROFILE definition is
> > > correct?
> >
> > Yes, I think this makes sense. Do we have a buy in from userspace folks
> > (Peter H, etc) for this?
> 
> AFAICT, libinput wouldn't use that new axis, simply because it doesn't
> care about game controllers.

yep, that's pretty much the summary from my side so ACK from me.

Cheers,
  Peter

> So it all comes down to game users to validate this (and probably only
> android is now the main consumer of these given that SDL and Steam are
> directly using hidraw or libusb to talk to controllers).
> 
> Cheers,
> Benjamin
> 
> >
> > I'd like some documentation added to Documentation/input/event-codes.rst
> > and potentially to Documentation/input/gamepad.rst even though profile
> > does not have to be gamepad specific event.
> >
> > Thanks.
> >
> > --
> > Dmitry
> >
>