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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Date:	Fri, 04 Jan 2008 08:09:33 -0800
From:	David Brownell <david-b@...bell.net>
To:	yi.y.yang@...el.com, pavel@....cz
Cc:	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

> > 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...

- Dave

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