// SPDX-License-Identifier: GPL-2.0
/*
 *  Airoha AN8855 Switch EFUSE Driver
 */

#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/nvmem-provider.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>

#define AN8855_EFUSE_CELL               50

#define AN8855_EFUSE_DATA0              0x1000a500
#define   AN8855_EFUSE_R50O             GENMASK(30, 24)

static int an8855_efuse_read(void *context, unsigned int offset,
                             void *val, size_t bytes)
{
        struct regmap *regmap = context;

        return regmap_bulk_read(regmap, AN8855_EFUSE_DATA0 + offset,
                                val, bytes / sizeof(u32));
}

static int an8855_efuse_probe(struct platform_device *pdev)
{
        struct nvmem_config an8855_nvmem_config = {
                .name = "an8855-efuse",
                .size = AN8855_EFUSE_CELL * sizeof(u32),
                .stride = sizeof(u32),
                .word_size = sizeof(u32),
                .reg_read = an8855_efuse_read,
        };
        struct device *dev = &pdev->dev;
        struct nvmem_device *nvmem;
        struct regmap *regmap;

        /* Assign NVMEM priv to MFD regmap */
        regmap = dev_get_regmap(dev->parent, NULL);
        if (!regmap)
                return -ENOENT;

        an8855_nvmem_config.priv = regmap;
        an8855_nvmem_config.dev = dev;
        nvmem = devm_nvmem_register(dev, &an8855_nvmem_config);

        return PTR_ERR_OR_ZERO(nvmem);
}

static const struct of_device_id an8855_efuse_of_match[] = {
        { .compatible = "airoha,an8855-efuse", },
        { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, an8855_efuse_of_match);

static struct platform_driver an8855_efuse_driver = {
        .probe = an8855_efuse_probe,
        .driver = {
                .name = "an8855-efuse",
                .of_match_table = an8855_efuse_of_match,
        },
};
module_platform_driver(an8855_efuse_driver);

MODULE_AUTHOR("Christian Marangi <ansuelsmth@gmail.com>");
MODULE_DESCRIPTION("Driver for AN8855 Switch EFUSE");
MODULE_LICENSE("GPL");