Need help with libgpiod gpiod_line_request_both_edges_events()

[Timur Tabi <timur@xxxxxxxxxxxxxx>]

I'm trying to test event handling with a loopback GPIO.  I have two
GPIOs, 37 and 38.  On my board, they are wired together.  I set 37 to
output and 38 to input.  If I write 1 to 37, I read a 1 from 38.  Same
thing with 0.

So I'm trying to test GPIO interrupts now.  I have this code:

        ret = gpiod_line_request_both_edges_events(input, NULL);

This function immediately returns with -1.  While debugging it, it
appears that the code in core.c is expecting the GPIO to be configured
as output.  Is that correct?  If so, that doesn't make any sense.  I'm
trying to receive an event when a GPIO transitions from 0 to 1 (or 1
to 0) on input.

I missing be missing something fundamental.

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