linux-kernel - Re: [PATCH] media: v4l2-ctrl: Add p_def to v4l2_ctrl

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Date:   Wed, 16 Oct 2019 14:20:47 +0200
From:   Ricardo Ribalda Delgado <ribalda@...nel.org>
To:     Hans Verkuil <hverkuil-cisco@...all.nl>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media <linux-media@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: v4l2-ctrl: Add p_def to v4l2_ctrl_config

Hi Hans

Not that awkward, the user has to use the brand new
v4l2_ctrl_ptr_create() ;). But if you prefer void * I can make the
change.

Regards

On Wed, Oct 16, 2019 at 2:17 PM Hans Verkuil <hverkuil-cisco@...all.nl> wrote:
>
> On 10/14/19 4:14 PM, Ricardo Ribalda Delgado wrote:
> > This allows setting the default value on compound controls created via
> > v4l2_ctrl_new_custom.
> >
> > Signed-off-by: Ricardo Ribalda Delgado <ribalda@...nel.org>
> > ---
> >  drivers/media/v4l2-core/v4l2-ctrls.c | 2 +-
> >  include/media/v4l2-ctrls.h           | 2 ++
> >  2 files changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
> > index bf50d37ef6c1..12cf38f73f7b 100644
> > --- a/drivers/media/v4l2-core/v4l2-ctrls.c
> > +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
> > @@ -2583,7 +2583,7 @@ struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
> >                       type, min, max,
> >                       is_menu ? cfg->menu_skip_mask : step, def,
> >                       cfg->dims, cfg->elem_size,
> > -                     flags, qmenu, qmenu_int, ptr_null, priv);
> > +                     flags, qmenu, qmenu_int, cfg->p_def, priv);
> >       if (ctrl)
> >               ctrl->is_private = cfg->is_private;
> >       return ctrl;
> > diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
> > index 26205ba3a0a0..2fca5b823961 100644
> > --- a/include/media/v4l2-ctrls.h
> > +++ b/include/media/v4l2-ctrls.h
> > @@ -375,6 +375,7 @@ struct v4l2_ctrl_handler {
> >   * @max:     The control's maximum value.
> >   * @step:    The control's step value for non-menu controls.
> >   * @def:     The control's default value.
> > + * @p_def:   The control's default value for compound controls.
> >   * @dims:    The size of each dimension.
> >   * @elem_size:       The size in bytes of the control.
> >   * @flags:   The control's flags.
> > @@ -403,6 +404,7 @@ struct v4l2_ctrl_config {
> >       s64 max;
> >       u64 step;
> >       s64 def;
> > +     union v4l2_ctrl_ptr p_def;
> >       u32 dims[V4L2_CTRL_MAX_DIMS];
> >       u32 elem_size;
> >       u32 flags;
> >
>
> I'm not sure about this. It might be a bit awkward to initialize p_def given that it is a union.
>
> Perhaps a simple void pointer would be easier?
>
> Regards,
>
>         Hans