linux-kernel - Re: [RFC PATCH 0/1] Add generic inverted led triggers

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Date:   Mon, 9 Mar 2020 15:05:49 +0100
From:   Tobias Schramm <t.schramm@...jaro.org>
To:     Pavel Machek <pavel@....cz>, Tobias Schramm <t.schramm@...jaro.org>
Cc:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Dan Murphy <dmurphy@...com>, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/1] Add generic inverted led triggers

Hi Pavel,

thanks for the feedback.

> Not a big fan (sorry).
> 
> We have already _way_ too many triggers, we don't want to have twice
> that much.

True. Doubling the amount of triggers is probably not a good idea.

> 
> Better implementation might be to have a trigger attribute doing the
> inverting.

I agree. Especially since Jacek pointed out that some triggers do that
already.

> 
> Inverting really does not work with all the triggers; numlock-inverted
> will not get too many
> users. always-on-inverted... blink-inverted.... I guess it does make
> sense for disk activity (but be warned disk can be continuously active
> for quite a while).
> 
> What triggers do you think make sense inverted?

I think all kinds of activity indicators (disk-activity, mmc, usb, ide,
nand, cpu, network, etc.) make sense. Guess I'll add a flags field to
the led_trigger struct and have an invertible flag that specifies
whether a trigger should be invertible or not.

Thanks again,

Tobias