linux-kernel - Re: [RFC] rfkill - Add support for input key to control wireless radio

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Date:	Tue, 12 Dec 2006 08:47:07 +0100
From:	"Ivo Van Doorn" <ivdoorn@...il.com>
To:	"Dmitry Torokhov" <dtor@...ightbb.com>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	"John Linville" <linville@...driver.com>,
	"Jiri Benc" <jbenc@...e.cz>,
	"Lennart Poettering" <lennart@...ttering.net>,
	"Johannes Berg" <johannes@...solutions.net>,
	"Larry Finger" <Larry.Finger@...inger.net>
Subject: Re: [RFC] rfkill - Add support for input key to control wireless radio

Hi,

> > > > > > 2 - Hardware key that does not control the hardware radio and does not report anything to userspace
> > > > >
> > > > > Kind of uninteresting button ;)
> > > >
> > > > And this is the button that rfkill was originally designed for.
> > > > Laptops with integrated WiFi cards from Ralink have a hardware button that don't send anything to
> > > > userspace (unless the ACPI event is read) and does not directly control the radio itself.
> > > >
> > >
> > > So what does such a button do? I am confused here...
> >
> > Without a handler like rfkill, it does nothing besides toggling a bit in a register.
> > The Ralink chipsets have a couple of registers that represent the state of that key.
> > Besides that, there are no notifications to the userspace nor does it directly control the
> > radio.
> > That is where rfkill came in with the toggle handler that will listen to the register
> > to check if the key has been pressed and properly process the key event.
>
> In this case the driver can make the button state available to userspace so
> thsi is really type 2) driver as far as I can see. The fact that the button
> is not reported to userspace yet should not get into our way of classifying
> it.

I was indeed considering it as a type 2) device.
I am currently working on revising the rfkill driver to work as you suggested,
so I hope to have a new patch ready for you soon.

Ivo
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