static int sunxi_sid_probe()

in sunxi_sid.c [112:171]

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

static int sunxi_sid_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct resource *res;
	struct nvmem_config *nvmem_cfg;
	struct nvmem_device *nvmem;
	struct sunxi_sid *sid;
	int size;
	char *randomness;
	const struct sunxi_sid_cfg *cfg;

	sid = devm_kzalloc(dev, sizeof(*sid), GFP_KERNEL);
	if (!sid)
		return -ENOMEM;

	cfg = of_device_get_match_data(dev);
	if (!cfg)
		return -EINVAL;
	sid->value_offset = cfg->value_offset;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	sid->base = devm_ioremap_resource(dev, res);
	if (IS_ERR(sid->base))
		return PTR_ERR(sid->base);

	size = cfg->size;

	nvmem_cfg = devm_kzalloc(dev, sizeof(*nvmem_cfg), GFP_KERNEL);
	if (!nvmem_cfg)
		return -ENOMEM;

	nvmem_cfg->dev = dev;
	nvmem_cfg->name = "sunxi-sid";
	nvmem_cfg->type = NVMEM_TYPE_OTP;
	nvmem_cfg->read_only = true;
	nvmem_cfg->size = cfg->size;
	nvmem_cfg->word_size = 1;
	nvmem_cfg->stride = 4;
	nvmem_cfg->priv = sid;
	if (cfg->need_register_readout)
		nvmem_cfg->reg_read = sun8i_sid_read_by_reg;
	else
		nvmem_cfg->reg_read = sunxi_sid_read;

	nvmem = devm_nvmem_register(dev, nvmem_cfg);
	if (IS_ERR(nvmem))
		return PTR_ERR(nvmem);

	randomness = kzalloc(size, GFP_KERNEL);
	if (!randomness)
		return -ENOMEM;

	nvmem_cfg->reg_read(sid, 0, randomness, size);
	add_device_randomness(randomness, size);
	kfree(randomness);

	platform_set_drvdata(pdev, nvmem);

	return 0;
}