linux-kernel - Re: [RESEND PATCH v17 00/17] Multi Color LED Framework

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Date:   Fri, 28 Feb 2020 10:39:23 +0100
From:   Pavel Machek <pavel@...x.de>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>
Cc:     Dan Murphy <dmurphy@...com>, Greg KH <gregkh@...uxfoundation.org>,
        Pavel Machek <pavel@...x.de>, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH v17 00/17] Multi Color LED Framework

Hi!

> >> Writing 3 or 4 or 5 numbers all at once in a single sysfs file to
> >> represent a single output should be fine.
> >> thanks,
> 
> Thank you for making this clear.
> 
> Effectively, the way to go as I see it now is just moving from
> colors directory to channel_intensity and channel_names files.

Yes.

> Besides that, since the issue of backwards compatibility with
> LED class still remains, we need to apply the already worked out
> formula for mapping brightness to color iout values.
> 
> This implies that color values written to channel_intensity file
> will be written unchanged to the hw only when global brightness
> is equal to max_brightness. This is because they will be multiplied
> by brightness / max_brightness ratio.
> 
> Do you agree, Pavel?

Yes. That seems like possible solution.

								Pavel
-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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