static int pps_gpio_setup()

in clients/pps-gpio.c [102:139]

• 29 lines of code
• 7 McCabe index (conditional complexity)

static int pps_gpio_setup(struct device *dev)
{
	struct pps_gpio_device_data *data = dev_get_drvdata(dev);
	int ret;
	u32 value;

	data->gpio_pin = devm_gpiod_get(dev, NULL, GPIOD_IN);
	if (IS_ERR(data->gpio_pin))
		return dev_err_probe(dev, PTR_ERR(data->gpio_pin),
				     "failed to request PPS GPIO\n");

	data->assert_falling_edge =
		device_property_read_bool(dev, "assert-falling-edge");

	data->echo_pin = devm_gpiod_get_optional(dev, "echo", GPIOD_OUT_LOW);
	if (IS_ERR(data->echo_pin))
		return dev_err_probe(dev, PTR_ERR(data->echo_pin),
				     "failed to request ECHO GPIO\n");

	if (!data->echo_pin)
		return 0;

	ret = device_property_read_u32(dev, "echo-active-ms", &value);
	if (ret) {
		dev_err(dev, "failed to get echo-active-ms from FW\n");
		return ret;
	}

	/* sanity check on echo_active_ms */
	if (!value || value > 999) {
		dev_err(dev, "echo-active-ms: %u - bad value from FW\n", value);
		return -EINVAL;
	}

	data->echo_active_ms = value;

	return 0;
}