From: Pavel Machek <pavel@ucw.cz>
To: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Cc: Tony Lindgren <tony@atomide.com>,
Jacek Anaszewski <j.anaszewski@samsung.com>,
Hans de Goede <hdegoede@redhat.com>,
linux-leds@vger.kernel.org, linux-omap@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Darren Hart <dvhart@infradead.org>
Subject: Re: PM regression with LED changes in next-20161109
Date: Fri, 11 Nov 2016 23:06:32 +0100 [thread overview]
Message-ID: <20161111220631.GA10983@amd> (raw)
In-Reply-To: <f7c9b2be-0003-f342-a4c7-802532faa424@gmail.com>
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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
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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next prev parent reply other threads:[~2016-11-11 22:06 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-09 19:23 PM regression with LED changes in next-20161109 Tony Lindgren
2016-11-09 20:45 ` Jacek Anaszewski
2016-11-10 8:49 ` Hans de Goede
2016-11-10 12:56 ` Jacek Anaszewski
2016-11-10 13:04 ` Hans de Goede
2016-11-10 13:55 ` Jacek Anaszewski
2016-11-10 16:36 ` Pavel Machek
2016-11-10 16:29 ` Pavel Machek
2016-11-10 16:44 ` Hans de Goede
2016-11-10 20:48 ` Pavel Machek
2016-11-11 8:25 ` Hans de Goede
2016-11-10 17:55 ` Tony Lindgren
2016-11-10 20:29 ` Pavel Machek
2016-11-10 21:34 ` Jacek Anaszewski
2016-11-11 12:01 ` Pavel Machek
2016-11-11 17:03 ` Jacek Anaszewski
2016-11-11 19:28 ` Hans de Goede
2016-11-11 22:12 ` Pavel Machek
2016-11-12 8:03 ` Hans de Goede
2016-11-13 9:10 ` Three different LED brightnesses (was Re: PM regression with LED changes in next-20161109) Pavel Machek
2016-11-13 9:44 ` Hans de Goede
2016-11-13 20:45 ` Pavel Machek
2016-11-12 10:24 ` PM regression with LED changes in next-20161109 Jacek Anaszewski
2016-11-12 10:33 ` Hans de Goede
2016-11-12 19:14 ` Jacek Anaszewski
2016-11-12 21:14 ` Hans de Goede
2016-11-13 11:44 ` Jacek Anaszewski
2016-11-13 13:52 ` Hans de Goede
2016-11-14 9:12 ` Jacek Anaszewski
2016-11-14 12:51 ` Hans de Goede
2016-11-15 10:01 ` Jacek Anaszewski
2016-11-15 10:09 ` Hans de Goede
2016-11-15 10:31 ` LEDs that change brightness "itself" -- that's a trigger. " Pavel Machek
2016-11-15 10:58 ` Jacek Anaszewski
2016-11-15 11:11 ` Pavel Machek
2016-11-15 11:21 ` Hans de Goede
2016-11-15 11:48 ` Pavel Machek
2016-11-15 12:06 ` Hans de Goede
2016-11-15 12:11 ` Pavel Machek
2016-11-15 13:28 ` Jacek Anaszewski
2016-11-15 13:48 ` Hans de Goede
2016-11-15 14:04 ` Jacek Anaszewski
2016-11-15 14:30 ` Hans de Goede
2016-11-15 14:41 ` Jacek Anaszewski
2016-11-17 22:12 ` Hans de Goede
2016-11-15 11:17 ` Hans de Goede
2016-11-14 8:31 ` Pavel Machek
2016-11-11 22:06 ` Pavel Machek [this message]
2016-11-10 8:34 ` Hans de Goede
2016-11-10 15:11 ` Tony Lindgren
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