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    SubjectRe: [PATCH] gpio sysfs: add a "toggle" value
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    On Thu, Jun 4, 2009 at 05:15, David Brownell wrote:
    > On Thursday 04 June 2009, Mike Frysinger wrote:
    >> the point was to lower the number of user<->kernel transitions.  yes,
    >> all of this stuff can of course be done in the shell, but it's hard to
    >> push limits when the interface is tying your hands and sitting on your
    >> back.
    >
    > So what's the application that needs to do all this in
    > userspace yet which can't hook up a quick kernel driver?
    >
    > I don't like the idea of embedding any kind of interpreter
    > in the sysfs interface, but that's the direction you seem
    > to be heading ...

    i dont view the userspace GPIO interface as a simple "i want to wiggle
    pins for fun and testing". i see it as a dynamic method for building
    userspace drivers for simple devices. as such, having a very simple
    "command language" for optimizing the interaction provides a pretty
    good trade off between kernel complexity and lowering overhead imo.
    -mike
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