linux-kernel - Re: [PATCH 1/3] platform: x86: dell-rbtn: Dell Airplane Mode Switch driver

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Message-Id: <201411242301.55012@pali>
Date:	Mon, 24 Nov 2014 23:01:54 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Darren Hart <dvhart@...radead.org>,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
	Gabriele Mazzotta <gabriele.mzt@...il.com>,
	Alex Hung <alex.hung@...onical.com>
Subject: Re: [PATCH 1/3] platform: x86: dell-rbtn: Dell Airplane Mode Switch driver

On Monday 24 November 2014 22:50:26 Matthew Garrett wrote:
> On Mon, Nov 24, 2014 at 09:55:47PM +0100, Pali Rohár wrote:
> > This is complicated. HW switch controls all radio devices
> > and you do not know which are present in specified running
> > machine. Also list of devices which HW switch controls can
> > be edited in BIOS (on some machines). So what to do? We
> > only know that it controls some devices...
> 
> Typically there'll be a firmware method that provides a mask
> of the controlled devices. Do you have the ACPI tables for a
> device that implements this? Registering an rfkill interface
> that claims to only control wifi but which also kills other
> devices is likely to confuse userspace - it would probably be
> better to avoid registering the rfkill interface at all in
> that case.

Currently you cannot control soft state of rfkill. It receive 
events when hard state was changed and update hard rfkill status 
(if is enabled or disabled).

-- 
Pali Rohár
pali.rohar@...il.com

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