linux-kernel - Re: PM regression with LED changes in next-20161109

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Date:   Fri, 11 Nov 2016 23:06:32 +0100
From:   Pavel Machek <pavel@....cz>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>
Cc:     Tony Lindgren <tony@...mide.com>,
        Jacek Anaszewski <j.anaszewski@...sung.com>,
        Hans de Goede <hdegoede@...hat.com>,
        linux-leds@...r.kernel.org, linux-omap@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Darren Hart <dvhart@...radead.org>
Subject: Re: PM regression with LED changes in next-20161109

Hi!

> >Hmm. So userland can read the LED state, and it can get _some_ value
> >back, but it can not know if it is current state or not.
> >
> >I don't think that's a good interface. I see it is from 2008... is
> >someone using it? Maybe it is too late for revert.
> 
> I can imagine it being used in flash LED use case. E.g. one
> could use oneshot trigger to trigger flash strobe, and then
> he could periodically read brightness file to check, for whatever
> reason, whether the flash is strobing.

I'm pretty sure nobody does that for flah strobe.
									Pavel

-- 
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