Re: [PATCH] driver model wakeup flags

[David Brownell <david-b@pacbell.net>]

On Wednesday 02 November 2005 1:59 pm, Greg KH wrote:
> On Sat, Oct 29, 2005 at 09:55:41AM +0200, Pavel Machek wrote:
> > Hi!
> > 
> > >   * There's a writeable sysfs "wakeup" file, with one of two values:
> > >       - "enabled", when the policy is to allow wakeup
> > >       - "disabled", when the policy is not to allow it
> > >       - "" if the device can't currently issue wakeups
> > 
> > Could we either get "not-supported" value here, or remove the file if it is not
> > supported? Having empty file is ugly...
> 
> Sure, have a patch for this?  :)

Turns out that "remove if not supported" is impractical; I did have
that implemented, and backed it out as I got deeper into testing.

For one example, the "can wakeup" for USB devices is a function of what
configuration the device is in ... so a device with two configurations
(call them #5 and #42) as well as "unconfigured" (config #0) might
not support wakeup in two of its three states; maybe only #42 supports
remote wakeup.

Yes, those empty files bothered me a bit too.

- Dave
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