On Wed, May 02, 2012 at 09:15:16AM +1000, NeilBrown wrote:

However it doesn't suit my need - I want something more abstracted.

I can see there may well be a place for a simple on/off switch for some
components, but then I would prefer to see it as

   /sys/class/power-switch/$devicename/state

rather than

  /sys/devices/platform/reg-userspace-consumer.X/{name,state}

That's a simple matter of programming if someone wants to do it, can't
say it seems worth the effort personally though especially when classes
are supposed to be going away.