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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <ZSmg4tqXiYiX18K/@duo.ucw.cz>
Date:   Fri, 13 Oct 2023 21:56:18 +0200
From:   Pavel Machek <pavel@....cz>
To:     Werner Sembach <wse@...edocomputers.com>
Cc:     ojeda@...nel.org, Lee Jones <lee@...nel.org>,
        linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org,
        linux-input@...r.kernel.org,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
Subject: Re: Implement per-key keyboard backlight as auxdisplay?

Hi!

> coming from the leds mailing list I'm writing with Pavel how to best handle
> per-key RGB keyboards.
> 
> His suggestion was that it could be implemented as an aux display, but he
> also suggested that I ask first if this fits.

Thanks for doing this.

> The specific keyboard RGB controller I want to implement takes 6*21 rgb
> values. However not every one is actually mapped to a physical key. e.g. the
> bottom row needs less entries because of the space bar. Additionally the
> keys are ofc not in a straight line from top to bottom.

So... a bit of rationale. The keyboard does not really fit into the
LED subsystem; LEDs are expected to be independent ("hdd led") and not
a matrix of them.

We do see various strange displays these days -- they commonly have
rounded corners and holes in them. I'm not sure how that's currently
supported, but I believe it is reasonable to view keyboard as a
display with slightly weird placing of pixels.

Plus, I'd really like to play tetris on one of those :-).

So, would presenting them as auxdisplay be acceptable? Or are there
better options?

Best regards,
								Pavel
-- 
People of Russia, stop Putin before his war on Ukraine escalates.

Download attachment "signature.asc" of type "application/pgp-signature" (196 bytes)