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SubjectRe: [PATCH v6 1/7] media: v4l2-core: Implement v4l2_ctrl_new_std_compound
Hi Ricardo,

On Fri, Sep 20, 2019 at 03:51:31PM +0200, Ricardo Ribalda Delgado wrote:
> Currently compound controls do not have a simple way of initializing its
> values. This results in ofuscated code with type_ops init.
>
> This patch introduces a new field on the control with the default value
> for the compound control that can be set with the brand new
> v4l2_ctrl_new_std_compound function
>
> Suggested-by: Hans Verkuil <hverkuil@xs4all.nl>
> Signed-off-by: Ricardo Ribalda Delgado <ricardo@ribalda.com>
> ---
> drivers/media/v4l2-core/v4l2-ctrls.c | 50 ++++++++++++++++++++++++----
> include/media/v4l2-ctrls.h | 22 +++++++++++-
> 2 files changed, 64 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
> index 1d8f38824631..219d8aeefa20 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
> @@ -29,6 +29,8 @@
> #define call_op(master, op) \
> (has_op(master, op) ? master->ops->op(master) : 0)
>
> +static const union v4l2_ctrl_ptr ptr_null;
> +
> /* Internal temporary helper struct, one for each v4l2_ext_control */
> struct v4l2_ctrl_helper {
> /* Pointer to the control reference of the master control */
> @@ -1530,7 +1532,10 @@ static void std_init_compound(const struct v4l2_ctrl *ctrl, u32 idx,
> struct v4l2_ctrl_mpeg2_slice_params *p_mpeg2_slice_params;
> void *p = ptr.p + idx * ctrl->elem_size;
>
> - memset(p, 0, ctrl->elem_size);
> + if (ctrl->p_def.p)
> + memcpy(p, ctrl->p_def.p, ctrl->elem_size);
> + else
> + memset(p, 0, ctrl->elem_size);
>
> /*
> * The cast is needed to get rid of a gcc warning complaining that
> @@ -2354,7 +2359,8 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
> s64 min, s64 max, u64 step, s64 def,
> const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
> u32 flags, const char * const *qmenu,
> - const s64 *qmenu_int, void *priv)
> + const s64 *qmenu_int, const union v4l2_ctrl_ptr p_def,
> + void *priv)
> {
> struct v4l2_ctrl *ctrl;
> unsigned sz_extra;
> @@ -2460,6 +2466,9 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
> is_array)
> sz_extra += 2 * tot_ctrl_size;
>
> + if (type >= V4L2_CTRL_COMPOUND_TYPES && p_def.p)
> + sz_extra += elem_size;
> +

I'm not sure I get how sz_extra is used in this function and what's
its purpose, just be aware that the previous if() condition already

sz_extra += 2 * tot_ctrl_size

for compound controls.

Are you just making space for the new p_def elements ? Should't you
then use tot_cltr_size ? In patch 3 you add support for AREA which has
a single element, but could p_def in future transport multiple values?

> ctrl = kvzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
> if (ctrl == NULL) {
> handler_set_err(hdl, -ENOMEM);
> @@ -2503,6 +2512,12 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
> ctrl->p_new.p = &ctrl->val;
> ctrl->p_cur.p = &ctrl->cur.val;
> }
> +
> + if (type >= V4L2_CTRL_COMPOUND_TYPES && p_def.p) {
> + ctrl->p_def.p = ctrl->p_cur.p + tot_ctrl_size;
> + memcpy(ctrl->p_def.p, p_def.p, elem_size);
> + }
> +
> for (idx = 0; idx < elems; idx++) {
> ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
> ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
> @@ -2554,7 +2569,7 @@ 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, priv);
> + flags, qmenu, qmenu_int, ptr_null, priv);
> if (ctrl)
> ctrl->is_private = cfg->is_private;
> return ctrl;
> @@ -2579,7 +2594,7 @@ struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
> }
> return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
> min, max, step, def, NULL, 0,
> - flags, NULL, NULL, NULL);
> + flags, NULL, NULL, ptr_null, NULL);
> }
> EXPORT_SYMBOL(v4l2_ctrl_new_std);
>
> @@ -2612,7 +2627,7 @@ struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
> }
> return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
> 0, max, mask, def, NULL, 0,
> - flags, qmenu, qmenu_int, NULL);
> + flags, qmenu, qmenu_int, ptr_null, NULL);
> }
> EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
>
> @@ -2644,11 +2659,32 @@ struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
> }
> return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
> 0, max, mask, def, NULL, 0,
> - flags, qmenu, NULL, NULL);
> + flags, qmenu, NULL, ptr_null, NULL);
>
> }
> EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
>
> +/* Helper function for standard compound controls */
> +struct v4l2_ctrl *v4l2_ctrl_new_std_compound(struct v4l2_ctrl_handler *hdl,
> + const struct v4l2_ctrl_ops *ops, u32 id,
> + const union v4l2_ctrl_ptr p_def)
> +{
> + const char *name;
> + enum v4l2_ctrl_type type;
> + u32 flags;
> + s64 min, max, step, def;
> +
> + v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
> + if (type < V4L2_CTRL_COMPOUND_TYPES) {
> + handler_set_err(hdl, -EINVAL);
> + return NULL;
> + }
> + return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
> + min, max, step, def, NULL, 0,
> + flags, NULL, NULL, p_def, NULL);
> +}
> +EXPORT_SYMBOL(v4l2_ctrl_new_std_compound);
> +
> /* Helper function for standard integer menu controls */
> struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
> const struct v4l2_ctrl_ops *ops,
> @@ -2669,7 +2705,7 @@ struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
> }
> return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
> 0, max, 0, def, NULL, 0,
> - flags, NULL, qmenu_int, NULL);
> + flags, NULL, qmenu_int, ptr_null, NULL);
> }
> EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
>
> diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
> index 570ff4b0205a..4b356df850a1 100644
> --- a/include/media/v4l2-ctrls.h
> +++ b/include/media/v4l2-ctrls.h
> @@ -200,6 +200,9 @@ typedef void (*v4l2_ctrl_notify_fnc)(struct v4l2_ctrl *ctrl, void *priv);
> * not freed when the control is deleted. Should this be needed
> * then a new internal bitfield can be added to tell the framework
> * to free this pointer.
> + * @p_def: The control's default value represented via a union which
> + * provides a standard way of accessing control types
> + * through a pointer (for compound controls only).
> * @p_cur: The control's current value represented via a union which
> * provides a standard way of accessing control types
> * through a pointer.
> @@ -254,6 +257,7 @@ struct v4l2_ctrl {
> s32 val;
> } cur;
>
> + union v4l2_ctrl_ptr p_def;
> union v4l2_ctrl_ptr p_new;
> union v4l2_ctrl_ptr p_cur;
> };
> @@ -618,7 +622,6 @@ struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
> struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
> const struct v4l2_ctrl_ops *ops,
> u32 id, u8 max, u64 mask, u8 def);
> -

This seems unrelated

> /**
> * v4l2_ctrl_new_std_menu_items() - Create a new standard V4L2 menu control
> * with driver specific menu.
> @@ -646,6 +649,23 @@ struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
> u64 mask, u8 def,
> const char * const *qmenu);
>
> +/**
> + * v4l2_ctrl_new_std_compound() - Allocate and initialize a new standard V4L2
> + * compound control.
> + *
> + * @hdl: The control handler.
> + * @ops: The control ops.
> + * @id: The control ID.
> + * @p_def: The control's p_def value.

Nit:
s/p_def value/default value/ ?


Thanks
j

> + *
> + * Sames as v4l2_ctrl_new_std(), but with support to compound controls, thanks
> + * to the @p_def field.
> + *
> + */
> +struct v4l2_ctrl *v4l2_ctrl_new_std_compound(struct v4l2_ctrl_handler *hdl,
> + const struct v4l2_ctrl_ops *ops, u32 id,
> + const union v4l2_ctrl_ptr p_def);
> +
> /**
> * v4l2_ctrl_new_int_menu() - Create a new standard V4L2 integer menu control.
> *
> --
> 2.23.0
>
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