linux-kernel - Re: [PATCH v2 0/5] ChromeOS Embedded Controller LED driver

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Date: Mon, 3 Jun 2024 22:56:26 +0200
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Dustin Howett <dustin@...ett.net>
Cc: Pavel Machek <pavel@....cz>, Lee Jones <lee@...nel.org>, 
	Benson Leung <bleung@...omium.org>, Guenter Roeck <groeck@...omium.org>, 
	Tzung-Bi Shih <tzungbi@...nel.org>, linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org, 
	chrome-platform@...ts.linux.dev, Mario Limonciello <mario.limonciello@....com>
Subject: Re: [PATCH v2 0/5] ChromeOS Embedded Controller LED driver

On 2024-06-02 18:30:06+0000, Dustin Howett wrote:
> On Fri, May 31, 2024 at 11:33 AM Thomas Weißschuh <linux@...ssschuh.net> wrote:
> >
> > Add a LED driver that supports the LED devices exposed by the
> > ChromeOS Embedded Controller.
> 
> I've tested this out on the Framework Laptop 13, 11th gen intel core
> and AMD Ryzen 7040 editions.
> 
> It works fairly well! I found a couple minor issues in day-to-day use:

Thanks!

> - Restoring the trigger to chromeos-auto does not always put the EC
> back in control, e.g. the side lights no longer return to reporting
> charge status.
>   I believe this happens when you move from any trigger except "none"
> to chromeos-auto, without first setting "none".

Thanks for the report, I'll investigate that.

> - The multicolor intensities report 6x 100 by default; if you set the
> brightness with the intensities set as such, it becomes only red. I
> would have
>   expected intensities of 100 0 0 0 0 0 if that were the case

The EC will always use the first nonzero intensity for the color
channel. It isn't a real PWM color mix.
I don't think there are possibilities in the multicolor API to enforce
this. For the next revision I'll need to document this properly.
Also the default intensities could be better indeed.

> Thomas, I apologize for the duplicate message; my mail client config
> here defaults to "reply" rather than "reply all."

No worries!