linux-kernel - RE: [PATCH] Add LED pattern trigger

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Message-ID: <BLU172-W18A7B97F4E688F416C5DABACC90@phx.gbl>
Date:	Tue, 31 Dec 2013 00:00:39 -0500
From:	Joe Xue <lgxue@...mail.com>
To:	Pavel Machek <pavel@....cz>
CC:	"cooloney@...il.com" <cooloney@...il.com>,
	"rpurdie@...ys.net" <rpurdie@...ys.net>,
	"rob@...dley.net" <rob@...dley.net>,
	"milo.kim@...com" <milo.kim@...com>,
	"linux-leds@...r.kernel.org" <linux-leds@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: RE: [PATCH] Add LED pattern trigger

> What about something like this?
>
> Not shcheduling timer when nothing changed should save a bit of power/cpu...
>
> if (pattern_data->pattern[pattern_data->count] == '/') {
> return;
> }
>
> this = pattern_data->pattern[pattern_data->count]
> if (this == '#')
> new_brigtness = pattern_data->brightness_on;
> if (this == ' ')
> new_brigtness = LED_OFF;
> repeat = 1;
> while (pattern_data->pattern[pattern_data->count + repeat] == this)
> repeat++;
>
> mod_timer(&pattern_data->timer,
> jiffies + msecs_to_jiffies(pattern_data->delay_unit * repeat));
>
>
Working on it.

Thanks for your help.

Joe 		 	   		  --
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