linux-kernel - Re: acpi/apm events as inputs: how to handle?

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Message-ID: <20080105233011.GA1883@elf.ucw.cz>
Date:	Sun, 6 Jan 2008 00:30:11 +0100
From:	Pavel Machek <pavel@....cz>
To:	Michael Tokarev <mjt@....msk.ru>
Cc:	Linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: acpi/apm events as inputs: how to handle?

On Wed 2008-01-02 12:56:40, Michael Tokarev wrote:
> (Not so) recently, ACPI events started appearing as
> key press events over linux input subsystem.  The
> question regarding this is simple: how it's supposed
> to be handled?
> 
> First of all, I don't know any software so far that
> can handle input layer in userspace when not running
> X.  In X, it's usually done using window manager
> setup or with special application (like, volume
> up/down keys etc).  But without X, there's no such
> application, as far as I can see.
> 
> It's easy to write one, but there may be.. issues
> with finding which input device to use.
> 
> Now, linux already have hotplug subsystem, using
> /sbin/hotplug helper (or whatever it points to,
> or using netlink).  ACPI key events are rare.
> 
> What I'm thinking about is: why ACPI events are
> routed over input subsystem, instead of hotplug
> subsystem?  With input, there's a need for a
> special daemon/application listening on the
> specific "keyboard" device, while with hotplug
> subsystem, it's already here - linux (by default
> anyway, if not running udev etc), kernel fires
> up a script when an event occurs.  I don't see
> how this special application/daemon is different
> from ol'good acpid.
> 
> Or.. maybe I missed something?

No, you are not missing anything. Yes, we could use /sbin/hotplug, but
it would be an ugly hack. So better write that daemon, or teach udevd
to read from input...
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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