Re: [patch/rfc 2.6.25-git] gpio: sysfs interface
From: David Brownell
Date: Sat May 17 2008 - 18:14:20 EST
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.
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