linux-kernel - Re: [linux-usb-devel] error to be returned while suspended

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Message-Id: <200610052325.39690.oliver@neukum.org>
Date:	Thu, 5 Oct 2006 23:25:39 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Pavel Machek <pavel@....cz>, linux-kernel@...r.kernel.org,
	linux-usb-devel@...ts.sourceforge.net
Subject: Re: [linux-usb-devel] error to be returned while suspended

Am Donnerstag, 5. Oktober 2006 22:48 schrieb Alan Stern:
> On Thu, 5 Oct 2006, Oliver Neukum wrote:
[..] 
> > If you freeze my batch jobs or make unavailable the servers
> > running on my laptop I'd be very unhappy.
> > But I want to make jostling a mouse or other input device safe. Thus
> > I want them to be suspended without autoresume. We need flexibility.
> 
> So you want a mode in which the input devices are suspended without remote 
> wakeup.  Remote wakeup settings are configurable via 
> /sys/devices/.../power/wakeup.  At this point nobody has settled on a
> new API for suspending the devices.  It's quite possible that different 
> drivers or different buses will use their own individual APIs.

I have a few observations, but no solution either:
- if root tells a device to suspend, it shall do so
- the issues of manual & automatic suspend and remote wakeup are orthogonal
- there should be a common API for all devices
- there's no direct connection between power save and open()

The question when a device is in use is far from trivial.

	Regards
		Oliver
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