[PATCH v3 4/7] media: imx214: Add new control with V4L2_CID_UNIT_CELL_SIZE

[Ricardo Ribalda Delgado <ribalda@kernel.org>]

According to the product brief, the unit cell size is 1120 nanometers^2.

https://www.sony-semicon.co.jp/products_en/IS/sensor1/img/products/ProductBrief_IMX214_20150428.pdf

Signed-off-by: Ricardo Ribalda Delgado <ribalda@kernel.org>
---
 drivers/media/i2c/imx214.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/media/i2c/imx214.c b/drivers/media/i2c/imx214.c
index 159a3a604f0e..cc0a013ba7da 100644
--- a/drivers/media/i2c/imx214.c
+++ b/drivers/media/i2c/imx214.c
@@ -47,6 +47,7 @@ struct imx214 {
 	struct v4l2_ctrl *pixel_rate;
 	struct v4l2_ctrl *link_freq;
 	struct v4l2_ctrl *exposure;
+	struct v4l2_ctrl *unit_size;
 
 	struct regulator_bulk_data	supplies[IMX214_NUM_SUPPLIES];
 
@@ -941,6 +942,26 @@ static int __maybe_unused imx214_resume(struct device *dev)
 	return ret;
 }
 
+static void unit_size_init(const struct v4l2_ctrl *ctrl, u32 idx,
+		     union v4l2_ctrl_ptr ptr)
+{
+	ptr.p_area->width = 1120;
+	ptr.p_area->height = 1120;
+}
+
+static const struct v4l2_ctrl_type_ops unit_size_ops = {
+	.init = unit_size_init,
+};
+
+static struct v4l2_ctrl *new_unit_size_ctrl(struct v4l2_ctrl_handler *handler)
+{
+	static struct v4l2_ctrl_config ctrl = {
+		.id = V4L2_CID_UNIT_CELL_SIZE,
+		.type_ops = &unit_size_ops,
+	};
+
+	return v4l2_ctrl_new_custom(handler, &ctrl, NULL);
+}
 static int imx214_probe(struct i2c_client *client)
 {
 	struct device *dev = &client->dev;
@@ -1029,6 +1050,8 @@ static int imx214_probe(struct i2c_client *client)
 					     V4L2_CID_EXPOSURE,
 					     0, 3184, 1, 0x0c70);
 
+	imx214->unit_size = new_unit_size_ctrl(&imx214->ctrls);
+
 	ret = imx214->ctrls.error;
 	if (ret) {
 		dev_err(&client->dev, "%s control init failed (%d)\n",
-- 
2.23.0.rc1