Re: [PATCH v4 2/5] gpiolib: add support for pull up/down to lineevent_create

[Kent Gibson <warthog618@gmail.com>]

On Thu, Oct 31, 2019 at 08:11:12AM +0100, Bartosz Golaszewski wrote:
> pon., 28 paź 2019 o 08:38 Kent Gibson <warthog618@gmail.com> napisał(a):
> >
> > Add support for pull up/down to lineevent_create.
> > Use cases include receiving asynchronous presses from a
> > push button without an external pull up/down.
> >
> > Also restrict the application of bias to lines
> > explicitly requested as inputs to prevent bias being applied
> > to as-is line requests.
> >
> > Signed-off-by: Kent Gibson <warthog618@gmail.com>
> > ---
> >  drivers/gpio/gpiolib.c | 10 ++++++++++
> >  1 file changed, 10 insertions(+)
> >
> > diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> > index e80e689be2cc..7dfbb3676ee0 100644
> > --- a/drivers/gpio/gpiolib.c
> > +++ b/drivers/gpio/gpiolib.c
> > @@ -554,6 +554,12 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
> >              (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE)))
> >                 return -EINVAL;
> >
> > +       /* PULL_UP and PULL_DOWN flags only make sense for input mode. */
> > +       if (!(lflags & GPIOHANDLE_REQUEST_INPUT) &&
> > +           ((lflags & GPIOHANDLE_REQUEST_BIAS_PULL_UP) ||
> > +            (lflags & GPIOHANDLE_REQUEST_BIAS_PULL_DOWN)))
> > +               return -EINVAL;
> > +
> 
> This is not part of this patch - this must go into 1/5.
> 
Yeah, that would make more sense.  Will relocate it in v5.

Cheers,
Kent.