media: ov5640: Add HBLANK control

Add the HBLANK control as read-only.

The hblank value is fixed in the mode definition and is updated
everytime a new format is applied.
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/i2c/ov5640.c

@@ -321,6 +321,7 @@ struct ov5640_ctrls {
 	struct v4l2_ctrl_handler handler;
 	struct v4l2_ctrl *pixel_rate;
 	struct v4l2_ctrl *link_freq;
+	struct v4l2_ctrl *hblank;
 	struct {
 		struct v4l2_ctrl *auto_exp;
 		struct v4l2_ctrl *exposure;
@@ -2699,6 +2700,8 @@ static int ov5640_update_pixel_rate(struct ov5640_dev *sensor)
 	const struct ov5640_mode_info *mode = sensor->current_mode;
 	enum ov5640_pixel_rate_id pixel_rate_id = mode->pixel_rate;
 	struct v4l2_mbus_framefmt *fmt = &sensor->fmt;
+	const struct ov5640_timings *timings;
+	unsigned int hblank;
 	unsigned int i = 0;
 	u32 pixel_rate;
 	s64 link_freq;
@@ -2756,6 +2759,11 @@ static int ov5640_update_pixel_rate(struct ov5640_dev *sensor)
 	__v4l2_ctrl_s_ctrl_int64(sensor->ctrls.pixel_rate, pixel_rate);
 	__v4l2_ctrl_s_ctrl(sensor->ctrls.link_freq, i);
 
+	timings = ov5640_timings(sensor, mode);
+	hblank = timings->htot - mode->width;
+	__v4l2_ctrl_modify_range(sensor->ctrls.hblank,
+				 hblank, hblank, 1, hblank);
+
 	return 0;
 }
 
@@ -3220,6 +3228,8 @@ static int ov5640_init_controls(struct ov5640_dev *sensor)
 	const struct v4l2_ctrl_ops *ops = &ov5640_ctrl_ops;
 	struct ov5640_ctrls *ctrls = &sensor->ctrls;
 	struct v4l2_ctrl_handler *hdl = &ctrls->handler;
+	const struct ov5640_timings *timings;
+	unsigned int hblank;
 	int ret;
 
 	v4l2_ctrl_handler_init(hdl, 32);
@@ -3239,6 +3249,11 @@ static int ov5640_init_controls(struct ov5640_dev *sensor)
 					OV5640_DEFAULT_LINK_FREQ,
 					ov5640_csi2_link_freqs);
 
+	timings = ov5640_timings(sensor, mode);
+	hblank = timings->htot - mode->width;
+	ctrls->hblank = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_HBLANK, hblank,
+					  hblank, 1, hblank);
+
 	/* Auto/manual white balance */
 	ctrls->auto_wb = v4l2_ctrl_new_std(hdl, ops,
 					   V4L2_CID_AUTO_WHITE_BALANCE,
@@ -3288,6 +3303,7 @@ static int ov5640_init_controls(struct ov5640_dev *sensor)
 
 	ctrls->pixel_rate->flags |= V4L2_CTRL_FLAG_READ_ONLY;
 	ctrls->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+	ctrls->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
 	ctrls->gain->flags |= V4L2_CTRL_FLAG_VOLATILE;
 	ctrls->exposure->flags |= V4L2_CTRL_FLAG_VOLATILE;