GPIO deprecated method?

[homeJLB]

in the wiki it says "use sysfs as a prefered method" now since linux 4.8 the GPIO sysfs interface is deprecated.
the "new" method is libgpiod.

What method is the best?

For now i'm using sysfs and I nothis sometimes the status is not up-to-date to the pin state as input.

Is there a common method in use or must the wiki-page been updated?

Thanks for your thoughts

[waltervl]

I think Domoticz itself has to be updated first to use the new libgpiod method. After that the wiki can be updated.

As it looks sysfs is still not really deprecated.

[Pchatill]

Hello.
libgpiod works fine for me.
But only for outputs?
I didn't see any information to define a pin as Input.

[Rik60]

Sysfs is still working. But if Domoticz is changing from SysV to systemd (perhaps in the future) you can have problems. At the moment is libgpiod working in Domoticz, it can control inputs and outputs. At the moment there are a few plugins that can handle libgpiod.
At the moment am i testing a plugin created by AI that is controlling 8 outputs and that is using libgpiod. Running on a Rpi3B+ Trixie. This plugin must be able to read inputs, but did not test that.

[Pchatill]

Thanks Rik60 for your answer.
But I didn't understand exactly what you mean:

At the moment is libgpiod working in Domoticz, it can control inputs and outputs

This plugin must be able to read inputs, but did not test that.

If it's working (or if I want to test), what is the configuration file format?
For outputs ,this is:

Code: Select all

{
  "gpio_pins": [5, 6, 13, 16, 19, 20, 21, 26],
  "relay_logic": "active_low",
  "gpio_chip": "gpiochip0",
  "relay_names": [
    "Relay 1",
    "Relay 2",
    "Relay 3",
    "Relay 4",
    "Relay 5",
    "Relay 6",
    "Relay 7",
    "Relay 8"
  ]
}

But I didn't find anything for inputs
Thanks

[Rik60]

Thats right. The plugin you use can only control outputs. You can't select inputs with the plugin. You need (or write) another plugin for controlling inputs, like i did.

[Pchatill]

And can you share your plugin?
I'm not able to do that...

[Rik60]

I am not a programmer, so AI did it for me, and for me this is working. I only use 8 outputs but the plugin must be able to handle inputs, did not test that. There is a read_me.txt file how to install it (unzip first).
The plugin is not at github at the moment, it's only for testing now. Please let me know the results.
Advice: make a backup first.

[Pchatill]

Thanks a lot for sharing.
I Have some errors:

2026-03-13 18:52:06.556 Error: GPIO: (Domoticz_GPIO_8) failed to load 'plugin.py', Python Path used was '/home/pchatill/domoticz/plugins/Domoticz-Universal-GPIO/:/usr/lib/python313.zip:/usr/lib/python3.13:/usr/lib/python3.13/lib-dynload:/usr/local/lib/python3.13/dist-packages:/usr/lib/python3/dist-packages:/usr/lib/python3.13/dist-packages'.
2026-03-13 18:52:06.560 Error: GPIO: Traceback (most recent call last):
2026-03-13 18:52:06.560 Error: GPIO: File "/home/pchatill/domoticz/plugins/Domoticz-Universal-GPIO/plugin.py", line 19, in <module>
2026-03-13 18:52:06.560 Error: GPIO: import gpio_config as cfg
2026-03-13 18:52:06.560 Error: GPIO: File "/home/pchatill/domoticz/plugins/Domoticz-Universal-GPIO/gpio_config.py", line 20, in <module>
2026-03-13 18:52:06.560 Error: GPIO: [24, "GpioIn24", "in", "None", down]
2026-03-13 18:52:06.560 Error: GPIO: ^^^^
2026-03-13 18:52:06.560 Error: GPIO: NameError: name 'down' is not defined

[Rik60]

Please remove the " around None, down must have them:

Code: Select all

[24, "GpioIn24", "in", None, "down"]

[Pchatill]

Sorry for the mistake Rik60
I just do a small test with an Input an 3 outputs: It work'fine now!!
Thanks a lot!!
Please feel free to ask me more tests (With this plugin or with an update)
With private message if you prefer

Patrick

[Rik60]

Thanks for testing
I also have added 2 inputs in the config file, after a domoticz service restart i found them in the device list.

[Pchatill]

I have a question:
Is your script will be able to manage a GPIO extension with I2C (Or SPI)?
This one, only for example:

https://thepihut.com/products/gravity-c ... ion-module

Thanks

[Rik60]

No, it only can handle inputs and outputs. Sadly no I2C or SPI

[Rik60]

No, it only can handle inputs and outputs. Sadly no I2C or SPI

For I2C and SPI you can check the Domoticz wiki

[mgugu]

Brilliant solution ! Personnally I wrote an external Python script (also with Anthropic AI help) which handle GPIO and create MQTT AD message to use it with anything. This works fine, but I got an issue when I switched from Bookworm (libgpio v1.x) to Trixie (libgpio v2.x) due to that API's are not compatible and the script had to be modified. Hope ascendant compatibility will be assured for further evolutions.