Hi,
I'm trying to understand how to control GPIOs on a bt878 card, as described in 
this earlier post:

http://thread.gmane.org/gmane.linux.drivers.video-input-infrastructure/39342

I came across the file bttv-gpio.c in drivers/media/video/bt8xx, and the 
starting comment seems what I'm looking for:

"sysfs-based sub driver interface for bttv mainly intented for gpio access"

But I cannot understand how to enable this sysfs based access. Is there a 
kernel configuration somewhere? Where the gpios are supposed to show up in 
/sys?

Thank you in advance for your help and excuse me if my question is trivial.

-- 
Augusto Destrero, PhD
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