int led_classdev_register_ext()

in led-class.c [335:424]

• 74 lines of code
• 15 McCabe index (conditional complexity)

int led_classdev_register_ext(struct device *parent,
			      struct led_classdev *led_cdev,
			      struct led_init_data *init_data)
{
	char composed_name[LED_MAX_NAME_SIZE];
	char final_name[LED_MAX_NAME_SIZE];
	const char *proposed_name = composed_name;
	int ret;

	if (init_data) {
		if (init_data->devname_mandatory && !init_data->devicename) {
			dev_err(parent, "Mandatory device name is missing");
			return -EINVAL;
		}
		ret = led_compose_name(parent, init_data, composed_name);
		if (ret < 0)
			return ret;

		if (init_data->fwnode) {
			fwnode_property_read_string(init_data->fwnode,
				"linux,default-trigger",
				&led_cdev->default_trigger);

			if (fwnode_property_present(init_data->fwnode,
						    "retain-state-shutdown"))
				led_cdev->flags |= LED_RETAIN_AT_SHUTDOWN;
		}
	} else {
		proposed_name = led_cdev->name;
	}

	ret = led_classdev_next_name(proposed_name, final_name, sizeof(final_name));
	if (ret < 0)
		return ret;

	mutex_init(&led_cdev->led_access);
	mutex_lock(&led_cdev->led_access);
	led_cdev->dev = device_create_with_groups(leds_class, parent, 0,
				led_cdev, led_cdev->groups, "%s", final_name);
	if (IS_ERR(led_cdev->dev)) {
		mutex_unlock(&led_cdev->led_access);
		return PTR_ERR(led_cdev->dev);
	}
	if (init_data && init_data->fwnode)
		device_set_node(led_cdev->dev, init_data->fwnode);

	if (ret)
		dev_warn(parent, "Led %s renamed to %s due to name collision",
				proposed_name, dev_name(led_cdev->dev));

	if (led_cdev->flags & LED_BRIGHT_HW_CHANGED) {
		ret = led_add_brightness_hw_changed(led_cdev);
		if (ret) {
			device_unregister(led_cdev->dev);
			led_cdev->dev = NULL;
			mutex_unlock(&led_cdev->led_access);
			return ret;
		}
	}

	led_cdev->work_flags = 0;
#ifdef CONFIG_LEDS_TRIGGERS
	init_rwsem(&led_cdev->trigger_lock);
#endif
#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
	led_cdev->brightness_hw_changed = -1;
#endif
	/* add to the list of leds */
	down_write(&leds_list_lock);
	list_add_tail(&led_cdev->node, &leds_list);
	up_write(&leds_list_lock);

	if (!led_cdev->max_brightness)
		led_cdev->max_brightness = LED_FULL;

	led_update_brightness(led_cdev);

	led_init_core(led_cdev);

#ifdef CONFIG_LEDS_TRIGGERS
	led_trigger_set_default(led_cdev);
#endif

	mutex_unlock(&led_cdev->led_access);

	dev_dbg(parent, "Registered led device: %s\n",
			led_cdev->name);

	return 0;
}