linux-kernel - Re: [linux-pm][PATCH] base: Change power/wakeup output from "" to "unsupported" if wakeup feature isn't supported by a device

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Message-Id: <1199669879.19185.20.camel@yangyi-dev.bj.intel.com>
Date:	Mon, 07 Jan 2008 09:37:59 +0800
From:	Yi Yang <yi.y.yang@...el.com>
To:	David Brownell <david-b@...bell.net>
Cc:	pavel@....cz, linux-pm@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [linux-pm][PATCH] base: Change power/wakeup output from "" to 
	"unsupported" if wakeup feature isn't supported by a device

On Fri, 2008-01-04 at 08:09 -0800, David Brownell wrote:
> > > This patch changes empty output to "unsupported" in order that a user knows
> > > wakeup feature isn't supported by this device when he/she
> > > 'cat /sys/devices/.../power/wakeup', please consider to apply,
> > > thanks.
> >
> > What about simply removing "wakuep" file if wakeup is not supported?
> 
> It may not *stay* unsupported, so I think changing it in either
> of those permanent ways would be confusing/misleading.
> 
> For example, USB devices have multiple states ... minimally, an
> unconfigured state, and a configured state.  Some have multiple
> configurations.  Only configured states can be wakeup-capable.
> So a given device might have three states, but support wakeup
> except in one of them...
If so, we can change "unsupported" to "unconfigurable" or "inoperable"
which can cover the states "unconfigured", "unsupported" and other
unknown states. :-).
> 
> - Dave
> 

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