On 8/23/19 2:37 PM, 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.za...@pengutronix.de>
> Signed-off-by: Ricardo Ribalda Delgado <riba...@kernel.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 */
Huh?
> 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));
This can be used in an array, so you have to honor the idx field.
> +}
> +
> +static const struct v4l2_ctrl_type_ops area_ops = {
> + .init = area_init,
> +};
This is a standard control type, so just add support for it the std_type_ops
functions.
> +
> +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,
This should be set to the passed id, not hardcoded.
> + .type_ops = &area_ops,
And just drop this line.
> + };
> +
> + return v4l2_ctrl_new_custom(hdl, &ctrl, (void *)area);
Don't pass area as a priv pointer. Instead the core will just initialize the
area to some default value (1x1), and then you can call set_ctrl()
after creating the control to set it to the proper value.
The READ_ONLY flag applies to the public API, but the kernel API still has
to be able to change it.
> +}
> +EXPORT_SYMBOL(v4l2_ctrl_new_area);
> +
> +/* Helper function for standard integer menu controls */
This comment doesn't belong here.
> /* Add the controls from another handler to our own. */
> int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
> struct v4l2_ctrl_handler *add,
> diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
> index 9a3d11350e67..36f0712ea6dd 100644
> --- a/include/media/v4l2-ctrls.h
> +++ b/include/media/v4l2-ctrls.h
> @@ -669,6 +669,22 @@ struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct
> v4l2_ctrl_handler *hdl,
> u32 id, u8 max, u8 def,
> const s64 *qmenu_int);
>
> +/**
> + * v4l2_ctrl_new_area() - Allocate and initialize a V4L2_CTRL_TYPE_AREA
> control.
> + *
> + * @hdl: The control handler.
> + * @ops: The control ops.
> + * @id: The control ID.
> + * @area: The width and height of the area in a struct v4l2_area.
Specifically, this is the initial width and height.
> + *
> + * If the &v4l2_ctrl struct could not be allocated then NULL is returned
> + * and @hdl->error is set to the error code (if it wasn't set already).
> + */
> +
> +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);
> +
> /**
> * typedef v4l2_ctrl_filter - Typedef to define the filter function to be
> * used when adding a control handler.
>
Regards,
Hans
