Question: how to release a previously requested line?

Hey there: I've a case where a framework first initializes the gpio line as input and then as interrupt. I don't know this in the input initialization so I'm first making a line request as type input, but then I would like to request the line as type event / interrupt. How can I release the previously set line or is there a way to change the request type?

I've tried gpiod.libgpiod.gpiod_line_release(), which does not throw an error, but it later complains that the line is still busy. Any idea what I'm doing wrong?

There is no function in gpiod.libgpiod that throws an error.

Why initialize to input first? line_request.EVENT_XX already means input.

If you want to request after line.request(config), try after line.release().

python3-gpiod/py_src/gpiod/libgpiodcxx/__init__.py

Lines 575 to 582 in b34ab48

    
               def release(self): 
        
                   """ 
        
                   @brief Release the line if it was previously requested. 
        
                   Usage: 
        
                       line.release() 
        
                   """ 
        
                   libgpiod.gpiod_line_release(self._throw_if_null_and_get_m_line())

Ah, well my bad. I didn't find that function in the code. I've used .release() now as you suggested and that works perfectly. Thanks!

The reason I've to use this for now (the quick+dirty solution) is that the software / framework I work with separates input/output and interrupt through two abstract methods that both get called in many different configuration. So I have to initialize the line as input in the one function and release+request it as interrupt again in the next because in the context of the input-function I don't know if I'm actually dealing with an interrupt config or just a regular input.

	def release(self):
	"""
	@brief Release the line if it was previously requested.

	Usage:
	line.release()
	"""
	libgpiod.gpiod_line_release(self._throw_if_null_and_get_m_line())