linux-kernel - Re: [PATCH v3 2/3] Input: joystick: xpad: Add X-Box Adaptive Controller Layer button

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Date:   Thu, 25 Aug 2022 15:21:52 -0700
From:   Nate Yocom <nate@...om.org>
To:     Bastien Nocera <hadess@...ess.net>, dmitry.torokhov@...il.com
Cc:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/3] Input: joystick: xpad: Add X-Box Adaptive
 Controller Layer button

On Wed, Aug 24, 2022 at 05:36:30PM +0200, Bastien Nocera wrote:
> On Wed, 2022-08-17 at 12:37 +0200, Bastien Nocera wrote:
> > On Sat, 2022-08-13 at 11:53 -0700, Nate Yocom wrote:
> > > Adds a new quirk for controllers that have a Layer button which has
> > > 4
> > > states, reflected as an ABS_MISC axis with 4 values.
> > 
> > It's called the "Profile Button" in the official documentation:
> > https://support.xbox.com/en-US/help/account-profile/accessibility/get-to-know-adaptive-controller
> > so best to call it that.
> > 
> > I wonder we have any other examples of profile handling in input
> > drivers. The xpadneo driver implements the profiles in the kernel
> > driver directly.
> > 
> > Benjamin?
> 
> After speaking to Benjamin, it was clear that ABS_MISC wasn't the right
> absolute axis to use.
> 
> I think that adding a new ABS_* axes in include/uapi/linux/input-event-
> codes.h would be the best, for example ABS_PROFILE as 0x21.

Makes sense to me. 

> Dmitry, what do you think?

I'll submit a v5 with ABS_PROFILE defined jic.

> 
> The idea here is to encode a hardware controlled switch that has 4
> possible values. Its state will be sent with every input event in order
> for user-space to (maybe) apply a specific profile to the events.
> 
> This would also be used by the XBox Elite 2 controller driver.
> 
> Cheers