linux-kernel - Re: [PATCH 4/4] leds: Let GPIO LEDs keep their current state

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Date:	Wed, 03 Dec 2008 10:04:24 +0000
From:	Richard Purdie <rpurdie@...ys.net>
To:	Pavel Machek <pavel@...e.cz>
Cc:	Trent Piepho <tpiepho@...escale.com>, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org,
	Anton Vorontsov <avorontsov@...mvista.com>,
	Sean MacLennan <smaclennan@...atech.com>,
	Wolfram Sang <w.sang@...gutronix.de>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: Re: [PATCH 4/4] leds: Let GPIO LEDs keep their current state

On Sun, 2008-11-23 at 13:31 +0100, Pavel Machek wrote:
> On Thu 2008-11-20 17:05:56, Trent Piepho wrote:
> > On Mon, 17 Nov 2008, Richard Purdie wrote:
> > > On Fri, 2008-10-24 at 16:09 -0700, Trent Piepho wrote:
> > >> +	if (template->keep_state)
> > >> +		state = !!gpio_get_value(led_dat->gpio) ^ led_dat->active_low;
> > >> +	else
> > >> +		state = template->default_state;
> > >>
> > >>  		state = of_get_property(child, "default-state", NULL);
> > >>  		led.default_state = state && !strcmp(state, "on");
> > >> +		led.keep_state = state && !strcmp(state, "keep");
> > >>
> > >> +++ b/include/linux/leds.h
> > >> @@ -138,7 +138,8 @@ struct gpio_led {
> > >>  	const char *default_trigger;
> > >>  	unsigned 	gpio;
> > >>  	u8 		active_low;
> > >> -	u8		default_state;
> > >> +	u8		default_state;	/* 0 = off, 1 = on */
> > >> +	u8		keep_state; /* overrides default_state */
> > >>  };
> > >
> > > How about something simpler here, just make default state have three
> > > different values - "keep", "on" and "off"? I'm not keen on having two
> > > different state variables like this.
> > 
> > I thought of that, but it ends up being more complex.  Instead of just
> > using:
> > static const struct gpio_led myled = {
> >  	.name = "something",
> >  	.keep_state = 1,
> > }
> > 
> > You'd do something like this:
> >  	.default_state = LEDS_GPIO_DEFSTATE_KEEP,
> > 
> > Is that better?
> 
> Yes.

Yes, agreed, much better.

Richard

-- 
Richard Purdie
Intel Open Source Technology Centre

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