Re: GPIO Char device and tools/gpio/gpio-utils.c

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Fri, Jul 21, 2017 at 7:26 PM, Jonathan Bennett
<jbennett@xxxxxxxxxxxxxx> wrote:

> So to use GPIO pins through the chardev interface, one has to hold on to the file
> descriptor to keep the pins from reverting to their initial state.  Is this a bug, or
> intended behavior?

I do not remember putting any code in that would explicitly return the
GPIO line to
the inital state.

That said it makes some weird sense as people might be probing around with
the tools and then it would be good behaviour to leave things in the room like
they were arranged when you entered, don't you think?

I'd like to hear Bartosz take on this though, he is more versed with userspace
GPIO than me these days, and talk directly to users of this feature.

Yours,
Linus Walleij
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