Re: Is it useful to support user level drivers

john slee
2001-06-21T14:05:10Z

On Thu, Jun 21, 2001 at 03:58:33PM +0200, Matthias Urlichs wrote:
> At 23:50 +1000 2001-06-21, john slee wrote:
> >i believe libgpio uses the existing usb/iee1394/serial/parallel
> >interfaces to provide a limited userspace driver capability.
>
> That only means, however, that the specific kernel drivers explicitly
> support mid-level usermode access.
>
> They still handle the actual hardware state changes without usermode support.

yes, that was the point. while it might be a stretch of the "mechanism,
not policy" argument, i like having drivers organized this way. it
makes a lot of sense for hotpluggable things like usb.

j.

--
"Bobby, jiggle Grandpa's rat so it looks alive, please" -- gary larson