linux-kernel - Re: [PATCH 2/3] leds-clevo-mail: hw accelerated LED blink extension

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Message-ID: <d120d5000707170604q2e3c0d36g9bea02f4ed3d3050@mail.gmail.com>
Date:	Tue, 17 Jul 2007 09:04:34 -0400
From:	"Dmitry Torokhov" <dmitry.torokhov@...il.com>
To:	"Németh Márton" <nm127@...email.hu>
Cc:	"Richard Purdie" <rpurdie@...ys.net>,
	linux-input@...ey.karlin.mff.cuni.cz, linux-kernel@...r.kernel.org,
	"Rodrigo Pereira" <rodripe@...il.com>
Subject: Re: [PATCH 2/3] leds-clevo-mail: hw accelerated LED blink extension

On 7/17/07, Németh Márton <nm127@...email.hu> wrote:
>
> +Hardware accelerated blink of LEDs
> +==================================
> +
> +Some LEDs can be programmed to blink without any CPU interaction. To
> +support this feature, a LED driver can optionally implement the
> +blink_set() function (see <linux/leds.h>). If implemeted, the
> +ledtrig-timer tries to use it. The blink_set() function should return
> +1 if the blink setting is supported, or 0 otherwise, which means that
> +the LED will be turned on and off from software.

Normally object methods in kernel return 0 on success and error code
(such as -EINVAL for unsupported parameters) on error.

-- 
Dmitry
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