static int meson_efuse_probe()

in meson-efuse.c [41:106]

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

static int meson_efuse_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct meson_sm_firmware *fw;
	struct device_node *sm_np;
	struct nvmem_device *nvmem;
	struct nvmem_config *econfig;
	struct clk *clk;
	unsigned int size;
	int ret;

	sm_np = of_parse_phandle(pdev->dev.of_node, "secure-monitor", 0);
	if (!sm_np) {
		dev_err(&pdev->dev, "no secure-monitor node\n");
		return -ENODEV;
	}

	fw = meson_sm_get(sm_np);
	of_node_put(sm_np);
	if (!fw)
		return -EPROBE_DEFER;

	clk = devm_clk_get(dev, NULL);
	if (IS_ERR(clk)) {
		ret = PTR_ERR(clk);
		if (ret != -EPROBE_DEFER)
			dev_err(dev, "failed to get efuse gate");
		return ret;
	}

	ret = clk_prepare_enable(clk);
	if (ret) {
		dev_err(dev, "failed to enable gate");
		return ret;
	}

	ret = devm_add_action_or_reset(dev,
				       (void(*)(void *))clk_disable_unprepare,
				       clk);
	if (ret) {
		dev_err(dev, "failed to add disable callback");
		return ret;
	}

	if (meson_sm_call(fw, SM_EFUSE_USER_MAX, &size, 0, 0, 0, 0, 0) < 0) {
		dev_err(dev, "failed to get max user");
		return -EINVAL;
	}

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

	econfig->dev = dev;
	econfig->name = dev_name(dev);
	econfig->stride = 1;
	econfig->word_size = 1;
	econfig->reg_read = meson_efuse_read;
	econfig->reg_write = meson_efuse_write;
	econfig->size = size;
	econfig->priv = fw;

	nvmem = devm_nvmem_register(&pdev->dev, econfig);

	return PTR_ERR_OR_ZERO(nvmem);
}