libgpiod

Installation

Fedora

$ sudo dnf install libgpiod-dev

Debian/Ubuntu

$ sudo apt install libgpiod-dev

Documentation

• Main documentation page on readthedocs.io: https://libgpiod.readthedocs.io/en/latest/index.html

• C++ binding documentation: https://libgpiod.readthedocs.io/en/latest/cpp_api.html

Upstream Source

• https://github.com/brgl/libgpiod

Example: Get Line Value

See libgpiod/bindings/cxx/examples/get_line_value.cpp

gpio-sim Kernel Module: configfs GPIO Simulator

• Configfs GPIO Simulator: https://docs.kernel.org/admin-guide/gpio/gpio-sim.html

• https://askubuntu.com/questions/1546213/how-to-create-gpio-sim-devices-in-configfs

• Load module

  # modprobe gpio-sim
  

• Create foo simulation “combo”

  # cd /sys/kernel/config/gpio-sim
  # mkdir foo
  # mkdir foo/bank0
  # echo 8 > foo/bank0/num_lines
  # echo 1 > live
  

Videos

• Bartosz Golaszewski: “New GPIO interface for linux user space” / #LinuxPiter

• New GPIO interface for linux user space GPIO character device API and libgpiod