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

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Message-ID: <CAFLxGvy31K9cgiuQKPmcbbr8QpMmj3vxmA1opNWT01qDUaLR0Q@mail.gmail.com>
Date:	Tue, 31 Dec 2013 13:29:21 +0100
From:	Richard Weinberger <richard.weinberger@...il.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Joe Xue <lgxue@...mail.com>,
	"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

On Tue, Dec 31, 2013 at 12:33 PM, Pavel Machek <pavel@....cz> wrote:
> On Tue 2013-12-31 00:00:39, Joe Xue wrote:
>> > 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.
>
> You are welcome :-).

Why do we need this within the kernel?
Patterns can easily created using a simple user space program.

-- 
Thanks,
//richard
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