linux-kernel - Re: [PATCH 3/8] rfkill: handle KEY_RADIO and SW

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Date:	Sat, 12 Apr 2008 15:17:06 +0200
From:	Ivo van Doorn <ivdoorn@...il.com>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	linux-kernel@...r.kernel.org,
	"John W. Linville" <linville@...driver.com>,
	Dmitry Torokhov <dtor@...l.ru>
Subject: Re: [PATCH 3/8] rfkill: handle KEY_RADIO and SW_RADIO events

On Saturday 12 April 2008, Henrique de Moraes Holschuh wrote:
> On Sat, 12 Apr 2008, Ivo van Doorn wrote:
> > On Saturday 12 April 2008, Henrique de Moraes Holschuh wrote:
> > > On Sat, 12 Apr 2008, Ivo van Doorn wrote:
> > > > On Friday 11 April 2008, Henrique de Moraes Holschuh wrote:
> > > > > The *_RADIO input events are related to all radios in a system.  There are
> > > > > two: KEY_RADIO and SW_RADIO.
> > > > > 
> > > > > Teach rfkill-input how to handle them.  In particular, SW_RADIO is not a
> > > > > toggle, but an absolute enable-or-disable command.
> > > > 
> > > > Not sure what you are trying to achieve here,
> > > > who triggers the SW_RADIO and why?
> > > 
> > > Thinkpad-acpi issues EV_SW SW_RADIO when the user changes a phisical
> > > switch in the unit.  It is a switch, not a button: it has an ON
> > > position, and an OFF position.
> > 
> > Ok, and such a switch is always intended to control all radios?
> > (in other words, it is the expected behavior it controls everything)
> 
> In every device I have seen which had a non-type-specific radio switch?
> Yes.
> 
> If we need type-specific switches (and NOT buttons/hot keys) for, e.g.,
> Bluetooth, the correct thing to do is to add EV_SW SW_BLUETOOTH.  The
> same goes for WWAN, UWB, etc.  But on laptops (which are the devices I
> am dealing with), these switches (when they exist) are meant to block
> *every* builtin radio and thus are not type-specific.
> 
> I can easily see someone designing a gadget with type-specific switches,
> but since nobody asked for such support yet, we don't have anything but
> SW_RADIO defined in the input layer right now.
> 
> So EV_SW SW_RADIO has "every radio" semanthics, just like KEY_RADIO.

Ok, thanks for the explanation.
You can add this patch to my ACK list then. :)

Ivo

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