[media] v4l2-common: move v4l2_ctrl_check to cx2341x

The v4l2_ctrl_check() helper function is now only used in cx2341x.
Move it there and make it static.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/drivers/media/common/cx2341x.c b/drivers/media/common/cx2341x.c
index be763150b8aa..c07b9db51b05 100644
--- a/drivers/media/common/cx2341x.c
+++ b/drivers/media/common/cx2341x.c
@@ -931,6 +931,35 @@ static void cx2341x_calc_audio_properties(struct cx2341x_mpeg_params *params)
         }
 }
 
+/* Check for correctness of the ctrl's value based on the data from
+   struct v4l2_queryctrl and the available menu items. Note that
+   menu_items may be NULL, in that case it is ignored. */
+static int v4l2_ctrl_check(struct v4l2_ext_control *ctrl, struct v4l2_queryctrl *qctrl,
+                const char * const *menu_items)
+{
+        if (qctrl->flags & V4L2_CTRL_FLAG_DISABLED)
+                return -EINVAL;
+        if (qctrl->flags & V4L2_CTRL_FLAG_GRABBED)
+                return -EBUSY;
+        if (qctrl->type == V4L2_CTRL_TYPE_STRING)
+                return 0;
+        if (qctrl->type == V4L2_CTRL_TYPE_BUTTON ||
+            qctrl->type == V4L2_CTRL_TYPE_INTEGER64 ||
+            qctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
+                return 0;
+        if (ctrl->value < qctrl->minimum || ctrl->value > qctrl->maximum)
+                return -ERANGE;
+        if (qctrl->type == V4L2_CTRL_TYPE_MENU && menu_items != NULL) {
+                if (menu_items[ctrl->value] == NULL ||
+                    menu_items[ctrl->value][0] == '\0')
+                        return -EINVAL;
+        }
+        if (qctrl->type == V4L2_CTRL_TYPE_BITMASK &&
+                        (ctrl->value & ~qctrl->maximum))
+                return -ERANGE;
+        return 0;
+}
+
 int cx2341x_ext_ctrls(struct cx2341x_mpeg_params *params, int busy,
                   struct v4l2_ext_controls *ctrls, unsigned int cmd)
 {