Re: What woke system up?

["Leo L. Schwab" <ewhac@best.com>]

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On Wed, Dec 21, 2005 at 07:46:30PM -0800, Todd Poynor wrote:
> On Tue, Dec 20, 2005 at 06:11:40PM -0800, Patrick Mochel wrote:
> > What about stashing a pointer to the device that did the wakeup, then
> > using a symlink to point to the sysfs directory of that device?  [ ... ]
> 
> Sounds good, here's a new version that does just that.  [ ... ]

	I'm entering this discussion late, but if I were putting this
together:
	- There would be a single file named /sys/power/wake,
	- Upon resume, the file would contain lines of plaintext of the
	  format:

		device: reason

	- 'device' names the device that performed the wakeup.  'device'
	  could be either a sysfs path or a /dev/blah/blah path (sysfs is
	  probably better, if more verbose, as it remains consistent
	  regardless of how /dev is configured),
	- 'reason' is free-form text, supplied by the device performing the
	  wakeup, and is entirely device-dependent.

	This approach allows multiple wakeup sources (rare, but possible),
and also allows a single multifunction device to report multiple reasons for
a wakeup.  It's also darned simple to parse.

	IMHO, of course.

					Schwab

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