static int is31fl319x_parse_dt()

in leds-is31fl319x.c [202:277]

• 60 lines of code
• 10 McCabe index (conditional complexity)

static int is31fl319x_parse_dt(struct device *dev,
			       struct is31fl319x_chip *is31)
{
	struct device_node *np = dev_of_node(dev), *child;
	int count;
	int ret;

	if (!np)
		return -ENODEV;

	is31->shutdown_gpio = devm_gpiod_get_optional(dev,
						"shutdown",
						GPIOD_OUT_HIGH);
	if (IS_ERR(is31->shutdown_gpio)) {
		ret = PTR_ERR(is31->shutdown_gpio);
		dev_err(dev, "Failed to get shutdown gpio: %d\n", ret);
		return ret;
	}

	is31->cdef = device_get_match_data(dev);

	count = of_get_available_child_count(np);

	dev_dbg(dev, "probing with %d leds defined in DT\n", count);

	if (!count || count > is31->cdef->num_leds) {
		dev_err(dev, "Number of leds defined must be between 1 and %u\n",
			is31->cdef->num_leds);
		return -ENODEV;
	}

	for_each_available_child_of_node(np, child) {
		struct is31fl319x_led *led;
		u32 reg;

		ret = of_property_read_u32(child, "reg", &reg);
		if (ret) {
			dev_err(dev, "Failed to read led 'reg' property\n");
			goto put_child_node;
		}

		if (reg < 1 || reg > is31->cdef->num_leds) {
			dev_err(dev, "invalid led reg %u\n", reg);
			ret = -EINVAL;
			goto put_child_node;
		}

		led = &is31->leds[reg - 1];

		if (led->configured) {
			dev_err(dev, "led %u is already configured\n", reg);
			ret = -EINVAL;
			goto put_child_node;
		}

		ret = is31fl319x_parse_child_dt(dev, child, led);
		if (ret) {
			dev_err(dev, "led %u DT parsing failed\n", reg);
			goto put_child_node;
		}

		led->configured = true;
	}

	is31->audio_gain_db = 0;
	ret = of_property_read_u32(np, "audio-gain-db", &is31->audio_gain_db);
	if (!ret)
		is31->audio_gain_db = min(is31->audio_gain_db,
					  IS31FL319X_AUDIO_GAIN_DB_MAX);

	return 0;

put_child_node:
	of_node_put(child);
	return ret;
}