linux-kernel - Re: In kernel virtual HID devices (was Future handling of complex RGB devices on Linux v3)

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Message-ID: <ZqE7sk0ZW0q8ueul@duo.ucw.cz>
Date: Wed, 24 Jul 2024 19:36:50 +0200
From: Pavel Machek <pavel@....cz>
To: Werner Sembach <wse@...edocomputers.com>
Cc: Benjamin Tissoires <bentiss@...nel.org>,
	Hans de Goede <hdegoede@...hat.com>, Lee Jones <lee@...nel.org>,
	jikos@...nel.org, linux-kernel@...r.kernel.org,
	Jelle van der Waa <jelle@...aa.nl>,
	Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	linux-input@...r.kernel.org, ojeda@...nel.org,
	linux-leds@...r.kernel.org, Gregor Riepl <onitake@...il.com>
Subject: Re: In kernel virtual HID devices (was Future handling of complex
 RGB devices on Linux v3)

Hi!

> > IMO working with the HID LampArray is the way forward. So I would
> > suggest to convert any non-HID RGB "LED display" that we are talking
> > about as a HID LampArray device through `hid_allocate_device()` in the
> > kernel. Basically what you are suggesting Hans. It's just that you don't
> > need a formal transport layer, just a child device that happens to be
> > HID.
> > 
> > The next question IMO is: do we want the kernel to handle such
> > machinery? Wouldn't it be simpler to just export the HID device and let
> > userspace talk to it through hidraw, like what OpenRGB does?
> 
> That's already part of my plan: The kernels main goal is to give devices a
> LampArray interface that don't have one already (e.g. because they are no
> HID devices to begin with).
> 
> The actual handling of LampArray will happen in userspace.
> 
> Exception is that maybe it could be useful to implement a small subset of
> LampArray in a generic leds-subsystem driver for backwards compatibility to
> userspace applications that only implement that (e.g. UPower). It would
> treat the whole keyboard as a single led.

Are you sure LampArray is good-enough interface? OpenRGB exposes
keycode-to-LED interface, how will that work with LampArray?

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

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