static int altera_ps_probe()

in altera-ps-spi.c [256:308]

• 45 lines of code
• 9 McCabe index (conditional complexity)

static int altera_ps_probe(struct spi_device *spi)
{
	struct altera_ps_conf *conf;
	const struct of_device_id *of_id;
	struct fpga_manager *mgr;

	conf = devm_kzalloc(&spi->dev, sizeof(*conf), GFP_KERNEL);
	if (!conf)
		return -ENOMEM;

	if (spi->dev.of_node) {
		of_id = of_match_device(of_ef_match, &spi->dev);
		if (!of_id)
			return -ENODEV;
		conf->data = of_id->data;
	} else {
		conf->data = id_to_data(spi_get_device_id(spi));
		if (!conf->data)
			return -ENODEV;
	}

	conf->spi = spi;
	conf->config = devm_gpiod_get(&spi->dev, "nconfig", GPIOD_OUT_LOW);
	if (IS_ERR(conf->config)) {
		dev_err(&spi->dev, "Failed to get config gpio: %ld\n",
			PTR_ERR(conf->config));
		return PTR_ERR(conf->config);
	}

	conf->status = devm_gpiod_get(&spi->dev, "nstat", GPIOD_IN);
	if (IS_ERR(conf->status)) {
		dev_err(&spi->dev, "Failed to get status gpio: %ld\n",
			PTR_ERR(conf->status));
		return PTR_ERR(conf->status);
	}

	conf->confd = devm_gpiod_get_optional(&spi->dev, "confd", GPIOD_IN);
	if (IS_ERR(conf->confd)) {
		dev_err(&spi->dev, "Failed to get confd gpio: %ld\n",
			PTR_ERR(conf->confd));
		return PTR_ERR(conf->confd);
	} else if (!conf->confd) {
		dev_warn(&spi->dev, "Not using confd gpio");
	}

	/* Register manager with unique name */
	snprintf(conf->mgr_name, sizeof(conf->mgr_name), "%s %s",
		 dev_driver_string(&spi->dev), dev_name(&spi->dev));

	mgr = devm_fpga_mgr_register(&spi->dev, conf->mgr_name,
				     &altera_ps_ops, conf);
	return PTR_ERR_OR_ZERO(mgr);
}