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path: root/sys/dev/gpio
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2004-06-03A framework for supporting various General Purpose Input/Output (GPIO)Alexander Yurchenko
devices. Such devices provide a set of pins that you can use to connect for example leds to it. The pins can be accessed either from userland through the /dev/gpio* device files or from the kernel drivers. The latter is necessary for implementing timing-sensitive things like i2c or 1-wire master controller. ok deraadt@