drivers/nvmem/uniphier-efuse.c

Source file repositories/reference/linux-study-clean/drivers/nvmem/uniphier-efuse.c

File Facts

System
Linux kernel
Corpus path
drivers/nvmem/uniphier-efuse.c
Extension
.c
Size
1924 bytes
Lines
79
Domain
Driver Families
Bucket
drivers/nvmem
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct uniphier_efuse_priv {
	void __iomem *base;
};

static int uniphier_reg_read(void *context,
			     unsigned int reg, void *_val, size_t bytes)
{
	struct uniphier_efuse_priv *priv = context;
	u8 *val = _val;
	int offs;

	for (offs = 0; offs < bytes; offs += sizeof(u8))
		*val++ = readb(priv->base + reg + offs);

	return 0;
}

static int uniphier_efuse_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct resource *res;
	struct nvmem_device *nvmem;
	struct nvmem_config econfig = {};
	struct uniphier_efuse_priv *priv;

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

	priv->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
	if (IS_ERR(priv->base))
		return PTR_ERR(priv->base);

	econfig.stride = 1;
	econfig.word_size = 1;
	econfig.read_only = true;
	econfig.reg_read = uniphier_reg_read;
	econfig.size = resource_size(res);
	econfig.priv = priv;
	econfig.dev = dev;
	econfig.add_legacy_fixed_of_cells = true;
	nvmem = devm_nvmem_register(dev, &econfig);

	return PTR_ERR_OR_ZERO(nvmem);
}

static const struct of_device_id uniphier_efuse_of_match[] = {
	{ .compatible = "socionext,uniphier-efuse",},
	{/* sentinel */},
};
MODULE_DEVICE_TABLE(of, uniphier_efuse_of_match);

static struct platform_driver uniphier_efuse_driver = {
	.probe = uniphier_efuse_probe,
	.driver = {
		.name = "uniphier-efuse",
		.of_match_table = uniphier_efuse_of_match,
	},
};
module_platform_driver(uniphier_efuse_driver);

MODULE_AUTHOR("Keiji Hayashibara <hayashibara.keiji@socionext.com>");
MODULE_DESCRIPTION("UniPhier eFuse driver");
MODULE_LICENSE("GPL v2");

Annotation

Implementation Notes