linux-kernel - Re: [PATCH] rfkill: Regulator consumer driver for rfkill

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Date:	Wed, 06 Apr 2011 16:32:02 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Antonio Ospite <ospite@...denti.unina.it>
Cc:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	linux-wireless@...r.kernel.org, openezx-devel@...ts.openezx.org,
	"John W . Linville" <linville@...driver.com>,
	Liam Girdwood <lrg@...mlogic.co.uk>,
	linux-kernel@...r.kernel.org, Marek Vasut <marek.vasut@...il.com>,
	Guiming Zhuo <gmzhuo@...il.com>
Subject: Re: [PATCH] rfkill: Regulator consumer driver for rfkill

On Wed, 2011-04-06 at 16:29 +0200, Antonio Ospite wrote:
> On Wed, 6 Apr 2011 23:11:33 +0900
> Mark Brown <broonie@...nsource.wolfsonmicro.com> wrote:
> 
> > On Wed, Apr 06, 2011 at 11:21:19AM +0200, Antonio Ospite wrote:
> > 
> > > +	tristate "Generic rfkill regulator driver"
> > > +	depends on RFKILL || !RFKILL
> > 
> > That looks *odd*.
> 
> Taken from Documentation/rfkill.txt section 3.  Kernel API.
> I guess I can drop it if we want to be stricter and just require RFKILL
> to be enabled. Johannes?

I guess it depends on what you're looking to do. Since all you implement
is set_block() you might very well not need to be able to have this if
nothing is ever going to invoke set_block(), in which case you can do
"depends on RFKILL".

The reason for this usually is that a driver, like a wireless driver,
should work even if there's no rfkill API available, but it shouldn't
need to put #ifdefs into the code itself.

johannes

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