On Tue, 9 Oct 2007, Greg KH wrote:

> The rules for sysfs files are the following:
>       - one value, in text format, per file.
>       - no action apon open/close
>       - binary files are only allowed for "pass-through" type files
>         that the kernel does not touch (like for firmware and pci
>         config space)
>       - directories should be associated with a kobject where it makes
>         sense (no nesting deep subdirectories without a kobject
>         present)

You have to stretch this a little for the power/ subdirectory every 
device gets.  The only kobject it corresponds to is the one in the 
device, which already corresponds to the parent directory.

Alan Stern

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