From: Oliver Neukum <oliver@neukum.org>
To: Pavel Machek <pavel@suse.cz>
Subject: Re: 2.6: drivers/input/power.c is never built
Date: Sat, 19 Feb 2005 00:51:47 +0100
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Cc: Vojtech Pavlik <vojtech@suse.cz>, dtor_core@ameritech.net,
       Richard Purdie <rpurdie@rpsys.net>,
       James Simmons <jsimmons@pentafluge.infradead.org>,
       Adrian Bunk <bunk@stusta.de>,
       Linux Input Devices <linux-input@atrey.karlin.mff.cuni.cz>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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Am Samstag, 19. Februar 2005 00:34 schrieb Pavel Machek:
> Hi!
> 
> > > Well, if you have power button on usb keyboard -- why should it be
> > > handled differently from built-in button?
> > 
> > I see no reason. But that tells you that one subsystem should handle
> > that, not which subsystem.
> 
> If usb keyboard has power button... I do not think we really want to
> route that through acpi. And what if acpi is not available? (APM knows
> about suspend key in weird way, but not about power key).

I'd suggest to primarily care about acpi. The other important power
management subsystems will follow suit.

> > > trip points), and I do not see how you can do interrupts for fan
> > > status. Either fans are under Linux control (and kernel could tell you
> > > when it turns fan on/off, but...), or they do not exist from Linux's
> > > point of few.
> > 
> > They still can have a readable rate, even if not under os control.
> > Nevertheless I don't think you can reasonably define what might
> > interest user space or not and in which detail.
> 
> Well, we can say that userspace definitely is interested in "power"
> key ;-).

I wouldn't call that selfevident. The system might be eg. a ticket
vending system and we care only about wake ups from touchscreen,
trackball and modem and about volume control keys. I don't think
you can make up any rules about what user space is interested or not.

	Regards
		Oliver
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