On Tue, 9 Oct 2007, Greg KH wrote:

quoted text
> 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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