media: ov5640: Add light frequency control

Add the light frequency control to be able to set the frequency
to manual (50Hz or 60Hz) or auto.

[Sakari Ailus: Rename "ctl" as "ctrl" as agreed.]
[mchehab+samsung@kernel.org: fixed two coding style warnings]

Signed-off-by: Mylène Josserand <mylene.josserand@bootlin.com>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
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+samsung@kernel.org>

drivers/media/i2c/ov5640.c

@@ -187,6 +187,7 @@ struct ov5640_ctrls {
 		struct v4l2_ctrl *gain;
 	};
 	struct v4l2_ctrl *brightness;
+	struct v4l2_ctrl *light_freq;
 	struct v4l2_ctrl *saturation;
 	struct v4l2_ctrl *contrast;
 	struct v4l2_ctrl *hue;
@@ -2155,6 +2156,21 @@ static int ov5640_set_ctrl_test_pattern(struct ov5640_dev *sensor, int value)
 			      0xa4, value ? 0xa4 : 0);
 }
 
+static int ov5640_set_ctrl_light_freq(struct ov5640_dev *sensor, int value)
+{
+	int ret;
+
+	ret = ov5640_mod_reg(sensor, OV5640_REG_HZ5060_CTRL01, BIT(7),
+			     (value == V4L2_CID_POWER_LINE_FREQUENCY_AUTO) ?
+			     0 : BIT(7));
+	if (ret)
+		return ret;
+
+	return ov5640_mod_reg(sensor, OV5640_REG_HZ5060_CTRL00, BIT(2),
+			      (value == V4L2_CID_POWER_LINE_FREQUENCY_50HZ) ?
+			      BIT(2) : 0);
+}
+
 static int ov5640_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
 {
 	struct v4l2_subdev *sd = ctrl_to_sd(ctrl);
@@ -2223,6 +2239,9 @@ static int ov5640_s_ctrl(struct v4l2_ctrl *ctrl)
 	case V4L2_CID_TEST_PATTERN:
 		ret = ov5640_set_ctrl_test_pattern(sensor, ctrl->val);
 		break;
+	case V4L2_CID_POWER_LINE_FREQUENCY:
+		ret = ov5640_set_ctrl_light_freq(sensor, ctrl->val);
+		break;
 	default:
 		ret = -EINVAL;
 		break;
@@ -2285,6 +2304,12 @@ static int ov5640_init_controls(struct ov5640_dev *sensor)
 					     ARRAY_SIZE(test_pattern_menu) - 1,
 					     0, 0, test_pattern_menu);
 
+	ctrls->light_freq =
+		v4l2_ctrl_new_std_menu(hdl, ops,
+				       V4L2_CID_POWER_LINE_FREQUENCY,
+				       V4L2_CID_POWER_LINE_FREQUENCY_AUTO, 0,
+				       V4L2_CID_POWER_LINE_FREQUENCY_50HZ);
+
 	if (hdl->error) {
 		ret = hdl->error;
 		goto free_ctrls;