linux-kernel - Re: Implement per-key keyboard backlight as auxdisplay?

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Message-ID: <CANiq72kvZcNp2ocXoqBae9q2UW+RPQy3dXUr+QS-izKpM1yyoA@mail.gmail.com>
Date:   Mon, 23 Oct 2023 13:44:46 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Jani Nikula <jani.nikula@...ux.intel.com>
Cc:     Pavel Machek <pavel@....cz>, Lee Jones <lee@...nel.org>,
        linux-kernel@...r.kernel.org,
        Werner Sembach <wse@...edocomputers.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        linux-input@...r.kernel.org, ojeda@...nel.org,
        linux-leds@...r.kernel.org
Subject: Re: Implement per-key keyboard backlight as auxdisplay?

On Mon, Oct 23, 2023 at 1:40 PM Jani Nikula <jani.nikula@...ux.intel.com> wrote:
>
> One could also reasonably make the argument that controlling the
> individual keyboard key backlights should be part of the input
> subsystem. It's not a display per se. (Unless you actually have small
> displays on the keycaps, and I think that's a thing too.)
>
> There's force feedback, there could be light feedback? There's also
> drivers/input/input-leds.c for the keycaps that have leds, like caps
> lock, num lock, etc.
>
> Anyway, just throwing ideas around, no strong opinions, really.

Yeah, sounds quite reasonable too, in fact it may make more sense
there given the LEDs are associated per-key rather than being an
uniform matrix in a rectangle if I understand correctly. If the input
subsystem wants to take it, that would be great.

Cheers,
Miguel