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Date:   Fri, 8 Feb 2019 10:55:14 -0600
From:   Dan Murphy <>
To:     Vesa Jääskeläinen <>,
        Pavel Machek <>
CC:     <>, <>,
        <>, <>
Subject: Re: [RFC PATCH] leds: multicolor: Add sysfs interface definition


On 2/7/19 11:09 PM, Vesa Jääskeläinen wrote:
> Hi All,
> On 08/02/2019 6.55, Vesa Jääskeläinen wrote:
>> Hi All,
>> On 31/01/2019 0.35, Pavel Machek wrote:
>>> On Wed 2019-01-30 12:30:05, Dan Murphy wrote:
>>>> Add a documentation of LED Multicolor LED class specific
>>>> sysfs attributes.
>>> No, sorry. This does not most of the requirements.
>>>                                 Pavel
>>> Requirements for RGB LED interface:
>> ...
>> I have tried to capture relevant parts of ideas and requirements and usage in a wiki page in github:
>> I believe the discussion is good to perform in mailing list -- I am happy to update or give you access to update the wiki so we could have easy to use summary/details source during discussions.
>> Ideas on the interface seem to be a bit drifting so I apologize if some of Your ideas were not captured.
>> There has been at least two direct proposals for userspace interface and I tried to provide usage example also for Dan's proposal. Feel free to correct me if I made a mistake.
>> I believe it is a good to create summary page as there seems to many aspects to be though out. What do you feel on this approach?
> And should we perhaps move this discussion only to linux-leds mailing list for successive replies :) ? So we don't generate too broad traffic.

Thank you for this.  I have posted updated documentation and posted updated code that includes a test file that does
nothing but register a dummy node.  This was tested on raspberry pi 5.0-rc kernel.

Also the code is updated for the LP50xx and a HACK for Droid4.

brightness-model is still an open topic on the best way to implement this so we have not introduced the code yet.

Here is the ABI doc;a=blob;f=Documentation/ABI/testing/sysfs-class-led-multicolor;h=45629199791285200e3775fc0b4dde1dfebb130f;hb=ce08183aa24edc0d883550339eef93fd72b4ac45

Here is the class description;a=blob;f=Documentation/leds/leds-class-multicolor.txt;h=357f045a826aac71d65704891c18e7fb31e5cb9b;hb=refs/heads/multicolor_class


> Thanks,
> Vesa Jääskeläinen

Dan Murphy

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