linux-kernel - Re: [PATCH v2] leds: fix brightness changing when software blinking is active

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Message-ID: <20150502145957.GB8156@xo-6d-61-c0.localdomain>
Date:	Sat, 2 May 2015 16:59:57 +0200
From:	Pavel Machek <pavel@....cz>
To:	Stas Sergeev <stsp@...t.ru>
Cc:	linux-leds@...r.kernel.org,
	Linux kernel <linux-kernel@...r.kernel.org>,
	Bryan Wu <cooloney@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Jacek Anaszewski <j.anaszewski@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Stas Sergeev <stsp@...rs.sourceforge.net>
Subject: Re: [PATCH v2] leds: fix brightness changing when software blinking
 is active

On Thu 2015-05-14 18:24:02, Stas Sergeev wrote:
> 
> The following sequence:
> echo timer >/sys/class/leds/<name>/trigger
> echo 1 >/sys/class/leds/<name>/brightness
> should change the ON brightness for blinking.
> The function led_set_brightness() was mistakenly initiating the
> delayed blink stop procedure, which resulted in no blinking with
> the timer trigger still active.
> 
> This patch fixes the problem by changing led_set_brightness()
> to not initiate the delayed blink stop when brightness is not 0.

Could we get this part of API documented? It is quite non-obvious... 0 clears the trigger,
other values do not, I thought it is a bug when I saw it...

Thanks,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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