linux-kernel - Re: [PATCH v3 5/7] media: v4l2-core: Add new helper for area controls

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Message-ID: <1566566016.3023.21.camel@pengutronix.de>
Date:   Fri, 23 Aug 2019 15:13:36 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Ricardo Ribalda Delgado <ribalda@...nel.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        linux-media <linux-media@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Jacopo Mondi <jacopo@...ndi.org>
Subject: Re: [PATCH v3 5/7] media: v4l2-core: Add new helper for area
 controls

On Fri, 2019-08-23 at 15:05 +0200, Ricardo Ribalda Delgado wrote:
> On Fri, Aug 23, 2019 at 2:56 PM Philipp Zabel <p.zabel@...gutronix.de> wrote:
> > 
> > On Fri, 2019-08-23 at 14:37 +0200, Ricardo Ribalda Delgado wrote:
> > > Adding a V4L2_CID_UNIT_CELL_SIZE control requires a lot of boilerplate,
> > > try to minimize it by adding a new helper.
> > > 
> > > Suggested-by: Philipp Zabel <p.zabel@...gutronix.de>
> > > Signed-off-by: Ricardo Ribalda Delgado <ribalda@...nel.org>
> > > ---
> > >  drivers/media/v4l2-core/v4l2-ctrls.c | 25 ++++++++++++++++++++++++-
> > >  include/media/v4l2-ctrls.h           | 16 ++++++++++++++++
> > >  2 files changed, 40 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
> > > index b3bf458df7f7..33e48f0aec1a 100644
> > > --- a/drivers/media/v4l2-core/v4l2-ctrls.c
> > > +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
> > > @@ -2660,7 +2660,6 @@ struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
> > >  }
> > >  EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
> > > 
> > > -/* Helper function for standard integer menu controls */
> > 
> > Why move this ...
> > 
> > >  struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
> > >                       const struct v4l2_ctrl_ops *ops,
> > >                       u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
> > > @@ -2684,6 +2683,30 @@ struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
> > >  }
> > >  EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
> > > 
> > > +static void area_init(const struct v4l2_ctrl *ctrl, u32 idx,
> > > +             union v4l2_ctrl_ptr ptr)
> > > +{
> > > +     memcpy(ptr.p_area, ctrl->priv, sizeof(*ptr.p_area));
> > > +}
> > > +
> > > +static const struct v4l2_ctrl_type_ops area_ops = {
> > > +     .init = area_init,
> > > +};
> > > +
> > > +struct v4l2_ctrl *v4l2_ctrl_new_area(struct v4l2_ctrl_handler *hdl,
> > > +                                  const struct v4l2_ctrl_ops *ops,
> > > +                                  u32 id, const struct v4l2_area *area)
> > > +{
> > > +     static struct v4l2_ctrl_config ctrl = {
> > > +             .id = V4L2_CID_UNIT_CELL_SIZE,
> > > +             .type_ops = &area_ops,
> > > +     };
> > > +
> > > +     return v4l2_ctrl_new_custom(hdl, &ctrl, (void *)area);
> > > +}
> > > +EXPORT_SYMBOL(v4l2_ctrl_new_area);
> > > +
> > > +/* Helper function for standard integer menu controls */
> > 
> > ... here?
> 
> Because I screwed up :). Let me fix that sorry.
> 
> I will push all your changes to:
> 
> https://github.com/ribalda/linux/tree/unit-size-v4
> 
> plus any other comment and then I will wait 2-3 days for resend

Awesome, thanks! Feel free to add

Reviewed-by: Philipp Zabel <p.zabel@...gutronix.de>

regards
Philipp