media: i2c: imx290: Factor out subdev init and cleanup to functions

The probe() function is large. Make it more readable by factoring the
subdev initialization code out. While at it, rename the error labels as
the "free_" prefix isn't accurate.

No functional change intended.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/i2c/imx290.c

@@ -1015,6 +1015,47 @@ static const struct media_entity_operations imx290_subdev_entity_ops = {
 	.link_validate = v4l2_subdev_link_validate,
 };
 
+static int imx290_subdev_init(struct imx290 *imx290)
+{
+	struct i2c_client *client = to_i2c_client(imx290->dev);
+	int ret;
+
+	/*
+	 * Initialize the frame format. In particular, imx290->current_mode
+	 * and imx290->bpp are set to defaults: imx290_calc_pixel_rate() call
+	 * below relies on these fields.
+	 */
+	imx290_entity_init_cfg(&imx290->sd, NULL);
+
+	ret = imx290_ctrl_init(imx290);
+	if (ret < 0) {
+		dev_err(imx290->dev, "Control initialization error %d\n", ret);
+		return ret;
+	}
+
+	v4l2_i2c_subdev_init(&imx290->sd, client, &imx290_subdev_ops);
+	imx290->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+	imx290->sd.dev = imx290->dev;
+	imx290->sd.entity.ops = &imx290_subdev_entity_ops;
+	imx290->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
+
+	imx290->pad.flags = MEDIA_PAD_FL_SOURCE;
+	ret = media_entity_pads_init(&imx290->sd.entity, 1, &imx290->pad);
+	if (ret < 0) {
+		dev_err(imx290->dev, "Could not register media entity\n");
+		v4l2_ctrl_handler_free(&imx290->ctrls);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void imx290_subdev_cleanup(struct imx290 *imx290)
+{
+	media_entity_cleanup(&imx290->sd.entity);
+	v4l2_ctrl_handler_free(&imx290->ctrls);
+}
+
 /* ----------------------------------------------------------------------------
  * Power management
  */
@@ -1147,10 +1188,10 @@ static int imx290_probe(struct i2c_client *client)
 	fwnode_handle_put(endpoint);
 	if (ret == -ENXIO) {
 		dev_err(dev, "Unsupported bus type, should be CSI2\n");
-		goto free_err;
+		goto err_endpoint;
 	} else if (ret) {
 		dev_err(dev, "Parsing endpoint node failed\n");
-		goto free_err;
+		goto err_endpoint;
 	}
 
 	/* Get number of data lanes */
@@ -1158,7 +1199,7 @@ static int imx290_probe(struct i2c_client *client)
 	if (imx290->nlanes != 2 && imx290->nlanes != 4) {
 		dev_err(dev, "Invalid data lanes: %d\n", imx290->nlanes);
 		ret = -EINVAL;
-		goto free_err;
+		goto err_endpoint;
 	}
 
 	dev_dbg(dev, "Using %u data lanes\n", imx290->nlanes);
@@ -1166,7 +1207,7 @@ static int imx290_probe(struct i2c_client *client)
 	if (!ep.nr_of_link_frequencies) {
 		dev_err(dev, "link-frequency property not found in DT\n");
 		ret = -EINVAL;
-		goto free_err;
+		goto err_endpoint;
 	}
 
 	/* Check that link frequences for all the modes are in device tree */
@@ -1174,7 +1215,7 @@ static int imx290_probe(struct i2c_client *client)
 	if (fq) {
 		dev_err(dev, "Link frequency of %lld is not supported\n", fq);
 		ret = -EINVAL;
-		goto free_err;
+		goto err_endpoint;
 	}
 
 	/* get system clock (xclk) */
@@ -1182,14 +1223,14 @@ static int imx290_probe(struct i2c_client *client)
 	if (IS_ERR(imx290->xclk)) {
 		dev_err(dev, "Could not get xclk");
 		ret = PTR_ERR(imx290->xclk);
-		goto free_err;
+		goto err_endpoint;
 	}
 
 	ret = fwnode_property_read_u32(dev_fwnode(dev), "clock-frequency",
 				       &xclk_freq);
 	if (ret) {
 		dev_err(dev, "Could not get xclk frequency\n");
-		goto free_err;
+		goto err_endpoint;
 	}
 
 	/* external clock must be 37.125 MHz */
@@ -1197,19 +1238,19 @@ static int imx290_probe(struct i2c_client *client)
 		dev_err(dev, "External clock frequency %u is not supported\n",
 			xclk_freq);
 		ret = -EINVAL;
-		goto free_err;
+		goto err_endpoint;
 	}
 
 	ret = clk_set_rate(imx290->xclk, xclk_freq);
 	if (ret) {
 		dev_err(dev, "Could not set xclk frequency\n");
-		goto free_err;
+		goto err_endpoint;
 	}
 
 	ret = imx290_get_regulators(dev, imx290);
 	if (ret < 0) {
 		dev_err(dev, "Cannot get regulators\n");
-		goto free_err;
+		goto err_endpoint;
 	}
 
 	imx290->rst_gpio = devm_gpiod_get_optional(dev, "reset",
@@ -1217,48 +1258,26 @@ static int imx290_probe(struct i2c_client *client)
 	if (IS_ERR(imx290->rst_gpio)) {
 		dev_err(dev, "Cannot get reset gpio\n");
 		ret = PTR_ERR(imx290->rst_gpio);
-		goto free_err;
+		goto err_endpoint;
 	}
 
 	mutex_init(&imx290->lock);
 
-	/*
-	 * Initialize the frame format. In particular, imx290->current_mode
-	 * and imx290->bpp are set to defaults: imx290_calc_pixel_rate() call
-	 * below relies on these fields.
-	 */
-	imx290_entity_init_cfg(&imx290->sd, NULL);
-
-	ret = imx290_ctrl_init(imx290);
-	if (ret < 0) {
-		dev_err(dev, "Control initialization error %d\n", ret);
-		goto free_mutex;
-	}
-
-	v4l2_i2c_subdev_init(&imx290->sd, client, &imx290_subdev_ops);
-	imx290->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
-	imx290->sd.dev = &client->dev;
-	imx290->sd.entity.ops = &imx290_subdev_entity_ops;
-	imx290->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
-
-	imx290->pad.flags = MEDIA_PAD_FL_SOURCE;
-	ret = media_entity_pads_init(&imx290->sd.entity, 1, &imx290->pad);
-	if (ret < 0) {
-		dev_err(dev, "Could not register media entity\n");
-		goto free_ctrl;
-	}
+	ret = imx290_subdev_init(imx290);
+	if (ret)
+		goto err_mutex;
 
 	ret = v4l2_async_register_subdev(&imx290->sd);
 	if (ret < 0) {
 		dev_err(dev, "Could not register v4l2 device\n");
-		goto free_entity;
+		goto err_subdev;
 	}
 
 	/* Power on the device to match runtime PM state below */
 	ret = imx290_power_on(dev);
 	if (ret < 0) {
 		dev_err(dev, "Could not power on the device\n");
-		goto free_entity;
+		goto err_subdev;
 	}
 
 	pm_runtime_set_active(dev);
@@ -1269,13 +1288,11 @@ static int imx290_probe(struct i2c_client *client)
 
 	return 0;
 
-free_entity:
-	media_entity_cleanup(&imx290->sd.entity);
-free_ctrl:
-	v4l2_ctrl_handler_free(&imx290->ctrls);
-free_mutex:
+err_subdev:
+	imx290_subdev_cleanup(imx290);
+err_mutex:
 	mutex_destroy(&imx290->lock);
-free_err:
+err_endpoint:
 	v4l2_fwnode_endpoint_free(&ep);
 
 	return ret;
@@ -1287,8 +1304,7 @@ static void imx290_remove(struct i2c_client *client)
 	struct imx290 *imx290 = to_imx290(sd);
 
 	v4l2_async_unregister_subdev(sd);
-	media_entity_cleanup(&sd->entity);
-	v4l2_ctrl_handler_free(sd->ctrl_handler);
+	imx290_subdev_cleanup(imx290);
 
 	mutex_destroy(&imx290->lock);