linux-kernel - Re: [PATCH v2 1/3] platform: x86: dell-rbtn: Dell Airplane Mode Switch driver

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Message-ID: <2564950.goQdGu3mlb@xps13>
Date:	Wed, 29 Apr 2015 15:57:58 +0200
From:	Gabriele Mazzotta <gabriele.mzt@...il.com>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Darren Hart <dvhart@...radead.org>,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
	Alex Hung <alex.hung@...onical.com>
Subject: Re: [PATCH v2 1/3] platform: x86: dell-rbtn: Dell Airplane Mode Switch driver

On Wednesday 29 April 2015 15:08:40 Pali Rohár wrote:
> On Wednesday 29 April 2015 12:30:32 Gabriele Mazzotta wrote:
> > On Wednesday 29 April 2015 11:51:04 Pali Rohár wrote:
> > > This is an ACPI driver for Dell laptops which receive HW switch events.
> > > It exports rfkill device dell-rbtn which provide correct hard rfkill state.
> > > 
> > > Alex Hung added code for supporting Dell laptops which have toggle button
> > > instead HW slider switch. On these laptops toggle button event is reported
> > > by new input device (instead rfkill) as they do not have hw radio switch.
> > > 
> > > It looks like those are two different functions (rfkill, input device), but
> > > Dell BIOS exports them via same ACPI device and uses same ACPI functions.
> > > So code is in one kernel driver.
> > 
> > I made a patch some time ago that I've just adapted. It allows to
> > prefer RBTN_SLIDER over RBTN_TOGGLE. The main reason why I'd like to
> > have the hardware switch is that the BIOS doesn't alter the soft state
> > of the devices. This comes in handy when the function key controls
> > multiple radio devices.
> > 
> 
> Now I'm thinking... is't this bug in wifi kernel driver (which exports
> phy rfkill)? Or problem somewhere else (userspace or kernel)?

What is the presumed bug you are referring to? The fact that the soft state
doesn't change?
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