Messages in this thread |  | | | Date | Tue, 20 May 2008 00:39:33 +0200 | | From | Pavel Machek <> | | Subject | Re: [patch/rfc 2.6.25-git] gpio: sysfs interface |
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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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