linux-kernel - AUXdisplay for LED arrays, keyboards with per-key LEDs -- was Re: [PATCH v2 2/2] leds: add aw20xx driver

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: <Y/50tKxpNVZO4Hfb@duo.ucw.cz>
Date:   Tue, 28 Feb 2023 22:40:04 +0100
From:   Pavel Machek <pavel@....cz>
To:     Martin Kurbanov <mmkurbanov@...rdevices.ru>, ojeda@...nel.org
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Lee Jones <lee@...nel.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel@...rdevices.ru,
        dri-devel@...ts.freedesktop.org
Subject: AUXdisplay for LED arrays, keyboards with per-key LEDs -- was Re:
 [PATCH v2 2/2] leds: add aw20xx driver

Hi!

> > +config LEDS_AW200XX
> > +	tristate "LED support for Awinic AW20036/AW20054/AW20072"
> > +	depends on LEDS_CLASS
> > +	depends on I2C
> > +	help
> > +	  This option enables support for the AW20036/AW20054/AW20072 LED driver.
> > +	  It is a 3x12/6x9/6x12 matrix LED driver programmed via
> > +	  an I2C interface, up to 36/54/72 LEDs or 12/18/24 RGBs,
> > +	  3 pattern controllers for auto breathing or group dimming control.
> 
> I'm afraid this should be handled as a display, not as an array of
> individual LEDs.

You probably want to see

AUXILIARY DISPLAY DRIVERS
M:      Miguel Ojeda <ojeda@...nel.org>
S:      Maintained
F:      Documentation/devicetree/bindings/auxdisplay/
F:      drivers/auxdisplay/
F:      include/linux/cfag12864b.h

And this brings another question...

...sooner or later we'll see LED displays with around 100 pixels in
almost rectangular grid. Minority of the pixels will have funny
shapes. How will we handle those? Pretend it is regular display with
some pixels missing? How do we handle cellphone displays with rounded
corners and holes for front camera?

And yes, such crazy displays are being manufactured -- it is called
keyboard with per-key backlight... 

https://www.reddit.com/r/MechanicalKeyboards/comments/8dtvgo/keyboard_with_individually_programmable_leds/

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)