linux-kernel - Re: [PATCH 2/2] enhance /sys/class/rfkill/<rfkill>/state interface

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Message-ID: <20100221000716.29ad3e90@schatten.dmk.lab>
Date:	Sun, 21 Feb 2010 00:07:16 +0100
From:	Florian Mickler <florian@...kler.org>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	linux-wireless@...r.kernel.org,
	Randy Dunlap <rdunlap@...otime.net>,
	"John W. Linville" <linville@...driver.com>,
	Alan Jenkins <alan-jenkins@...fmail.co.uk>,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [PATCH 2/2] enhance /sys/class/rfkill/<rfkill>/state interface

On Sat, 20 Feb 2010 23:14:48 +0100
Johannes Berg <johannes@...solutions.net> wrote:

> On Sat, 2010-02-20 at 22:40 +0100, florian@...kler.org wrote:
> > Introduce a new state-value RFKILL_STATE_SOFT_AND_HARD_BLOCKED
> > which is returned only through the sysfs state file.
> > The other interfaces are designed so that they don't need this extra
> > state.
> > 
> > This allows the sysfs to represent all possible states an rfkill
> > driver can
> > have.
> > 
> > Signed-off-by: Florian Mickler <florian@...kler.org>
> > ---
> > 
> > After stumbling over this arbitrary limitation of
> > sys/class/rfkill/*/state I
> > wondered what would hinder this patch?
> 
> This is not backward compatible, so can't be done.
> 
> johannes

hmm... ah, i see... if driver is in hard'n'soft-block state 
an userspace program would expect to read hardblock instead of the
new hard'n'softblock-state... 
now that i think of it, it even becomes obvious :) 

cheers,
Flo


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