Re: [PATCH] input: gpio_keys: Don't report events on gpio failure

From: Linus Walleij
Date: Thu Aug 13 2015 - 09:07:04 EST

On Tue, Aug 11, 2015 at 12:41 AM, Bjorn Andersson
<bjorn.andersson@xxxxxxxxxxxxxx> wrote:

> But then the question first goes to Linus & co.
> gpio_chip->get() can return a negative value to indicate errors (and did
> so in this case), all parts of the API seems indicates that we can get
> an error (int vs bool).


> Should we change _gpiod_get_raw_value() to propagate this error?

Yes for now. Can you patch it? :)

> Or
> should we just ignore this issue and propagate an error as GPIO high
> reading?

I don't know about the future. In some sense GPIOs are so smallish
resources that errorhandling every call to read/write them seem to
be a royal PITA. That is why I wanted to switch them to bool and get
rid of the problem, but now I also see that maybe that was not such a
smart idea, if errors do occur on the set/get_value path.


Linus Walleij
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