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    SubjectRe: [patch/rfc 2.6.25-git] gpio: sysfs interface
    On Sat 2008-05-17 15:14:06, David Brownell wrote:
    > On Friday 02 May 2008, Pavel Machek wrote:
    > >
    > > > >   echo "export 23" > /sys/class/gpio/control
    > > > >     ... will gpio_request(23, "sysfs") and gpio_export(23); use
    > > > >     /sys/class/gpio/gpio-23/direction to configure it.
    > > > >   echo "unexport 23" > /sys/class/gpio/control
    > > > >     ... will gpio_free(23)
    > > >
    > > > hm, does ths sysfs one-value-per-file rule apply to writes?
    > >
    > > Having seen ibm acpi interface... yes, that rule should be aplied for
    > > writes, too.
    >
    > The latest version of this patch, which I'll post soonish,
    > follows the suggestion to have one file for the "export"
    > operation and another for "unexport".
    >
    >
    > > What about mkdir gpio-N to export it?
    >
    > Ugh. That would create way more complication than I want
    > to see here. I thought about that early on, and decided
    > that was Not The Way To Go.

    ...but it would be consistent with configfs... and face it... doing
    echo > file to make a directory is seriously ugly.
    Pavel
    --
    (english) http://www.livejournal.com/~pavelmachek
    (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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