.. jf-topic:: ec.ec1.linux.gpio
   :dependencies: ec.ec1.linux.dev_mgmt

GPIO
====

Learn how to use the Linux GPIO subsystem, especially what it takes to
control GPIOs from userspace.

``sysfs`` Interface
-------------------

(Deprecated but simple)

* `Documentation
  <https://www.kernel.org/doc/Documentation/gpio/sysfs.txt>`__
* GPIO configuration
* Input
* Output
* Events/Interrupts

``gpiod`` Interface
-------------------

* `Source <https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/>`__