static int adgs1408_probe()

in adgs1408.c [53:103]

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

static int adgs1408_probe(struct spi_device *spi)
{
	struct device *dev = &spi->dev;
	enum adgs1408_chip_id chip_id;
	struct mux_chip *mux_chip;
	struct mux_control *mux;
	s32 idle_state;
	int ret;

	chip_id = (enum adgs1408_chip_id)device_get_match_data(dev);
	if (!chip_id)
		chip_id = spi_get_device_id(spi)->driver_data;

	mux_chip = devm_mux_chip_alloc(dev, 1, 0);
	if (IS_ERR(mux_chip))
		return PTR_ERR(mux_chip);

	mux_chip->ops = &adgs1408_ops;

	ret = adgs1408_spi_reg_write(spi, ADGS1408_SW_DATA, ADGS1408_DISABLE);
	if (ret < 0)
		return ret;

	ret = device_property_read_u32(dev, "idle-state", (u32 *)&idle_state);
	if (ret < 0)
		idle_state = MUX_IDLE_AS_IS;

	mux = mux_chip->mux;

	if (chip_id == ADGS1408)
		mux->states = 8;
	else
		mux->states = 4;

	switch (idle_state) {
	case MUX_IDLE_DISCONNECT:
	case MUX_IDLE_AS_IS:
	case 0 ... 7:
		/* adgs1409 supports only 4 states */
		if (idle_state < mux->states) {
			mux->idle_state = idle_state;
			break;
		}
		fallthrough;
	default:
		dev_err(dev, "invalid idle-state %d\n", idle_state);
		return -EINVAL;
	}

	return devm_mux_chip_register(dev, mux_chip);
}