static int mux_gpio_probe()

in gpio.c [48:93]

• 37 lines of code
• 8 McCabe index (conditional complexity)

static int mux_gpio_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct mux_chip *mux_chip;
	struct mux_gpio *mux_gpio;
	int pins;
	s32 idle_state;
	int ret;

	pins = gpiod_count(dev, "mux");
	if (pins < 0)
		return pins;

	mux_chip = devm_mux_chip_alloc(dev, 1, sizeof(*mux_gpio));
	if (IS_ERR(mux_chip))
		return PTR_ERR(mux_chip);

	mux_gpio = mux_chip_priv(mux_chip);
	mux_chip->ops = &mux_gpio_ops;

	mux_gpio->gpios = devm_gpiod_get_array(dev, "mux", GPIOD_OUT_LOW);
	if (IS_ERR(mux_gpio->gpios))
		return dev_err_probe(dev, PTR_ERR(mux_gpio->gpios),
				     "failed to get gpios\n");
	WARN_ON(pins != mux_gpio->gpios->ndescs);
	mux_chip->mux->states = BIT(pins);

	ret = device_property_read_u32(dev, "idle-state", (u32 *)&idle_state);
	if (ret >= 0 && idle_state != MUX_IDLE_AS_IS) {
		if (idle_state < 0 || idle_state >= mux_chip->mux->states) {
			dev_err(dev, "invalid idle-state %u\n", idle_state);
			return -EINVAL;
		}

		mux_chip->mux->idle_state = idle_state;
	}

	ret = devm_mux_chip_register(dev, mux_chip);
	if (ret < 0)
		return ret;

	dev_info(dev, "%u-way mux-controller registered\n",
		 mux_chip->mux->states);

	return 0;
}