From: Pavel Machek <pavel@ucw.cz>
To: marek.behun@nic.cz, jacek.anaszewski@gmail.com, dmurphy@ti.com,
linux-leds@vger.kernel.org
Subject: We have multicolor, but should we turn it into RGB?
Date: Mon, 27 Jul 2020 10:45:00 +0200 [thread overview]
Message-ID: <20200727084500.GA15237@amd> (raw)
[-- Attachment #1: Type: text/plain, Size: 1119 bytes --]
Hi!
Multicolor is a bit too abstract. Yes, we can have
Green-Magenta-Ultraviolet LED, but so far all the LEDs we support are
RGB, and not even RGB-White or RGB-Yellow variants emerged.
Multicolor is not a good fit for RGB LED. It does not really know
about LED color. In particular, there's no way to make LED "white".
Userspace is interested in knowing "this LED can produce arbitrary
color", which not all multicolor LEDs can.
Proposal: let's add "rgb" to led_colors in
drivers/leds/led-core.c, add corresponding device tree
defines, and use that, instead of multicolor for RGB LEDs.
We really need to do that now; "white" stuff can wait.
RGB LEDs are quite common, and it would be good to be able to turn LED
white and to turn it into any arbitrary color. It is essential that
userspace is able to set arbitrary colors, and it might be good to
have that ability from kernel, too... to allow full-color triggers.
Best regads,
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 181 bytes --]
next reply other threads:[~2020-07-27 8:45 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-27 8:45 Pavel Machek [this message]
2020-07-27 9:40 ` We have multicolor, but should we turn it into RGB? Marek Behún
2020-07-27 10:20 ` Pavel Machek
2020-07-27 10:52 ` Pavel Machek
2020-07-27 11:21 ` Marek Behún
2020-08-03 12:04 ` turris-omnia: fixes needed was " Pavel Machek
2020-08-03 12:01 ` [PATCH] Add multicolor to the list Pavel Machek
2020-08-03 12:02 ` [PATCH] leds: disallow /sys/class/leds/*:multi:* for now Pavel Machek
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200727084500.GA15237@amd \
--to=pavel@ucw.cz \
--cc=dmurphy@ti.com \
--cc=jacek.anaszewski@gmail.com \
--cc=linux-leds@vger.kernel.org \
--cc=marek.behun@nic.cz \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).