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// SPDX-License-Identifier: GPL-2.0-only OR MIT
/*
* Generic SPMI MFD NVMEM driver
*
* Copyright The Asahi Linux Contributors
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/nvmem-provider.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
struct spmi_mfd_nvmem {
struct regmap *regmap;
unsigned int base;
};
static int spmi_mfd_nvmem_read(void *priv, unsigned int offset,
void *val, size_t bytes)
{
struct spmi_mfd_nvmem *nvmem = priv;
return regmap_bulk_read(nvmem->regmap, nvmem->base + offset, val, bytes);
}
static int spmi_mfd_nvmem_write(void *priv, unsigned int offset,
void *val, size_t bytes)
{
struct spmi_mfd_nvmem *nvmem = priv;
return regmap_bulk_write(nvmem->regmap, nvmem->base + offset, val, bytes);
}
static int spmi_mfd_nvmem_probe(struct platform_device *pdev)
{
struct spmi_mfd_nvmem *nvmem;
const __be32 *addr;
int len;
struct nvmem_config nvmem_cfg = {
.dev = &pdev->dev,
.name = "spmi_mfd_nvmem",
.id = NVMEM_DEVID_AUTO,
.word_size = 1,
.stride = 1,
.reg_read = spmi_mfd_nvmem_read,
.reg_write = spmi_mfd_nvmem_write,
};
nvmem = devm_kzalloc(&pdev->dev, sizeof(*nvmem), GFP_KERNEL);
if (!nvmem)
return -ENOMEM;
nvmem_cfg.priv = nvmem;
nvmem->regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!nvmem->regmap) {
dev_err(&pdev->dev, "Parent regmap unavailable.\n");
return -ENXIO;
}
addr = of_get_property(pdev->dev.of_node, "reg", &len);
if (!addr) {
dev_err(&pdev->dev, "no reg property\n");
return -EINVAL;
}
if (len != 2 * sizeof(u32)) {
dev_err(&pdev->dev, "invalid reg property\n");
return -EINVAL;
}
nvmem->base = be32_to_cpup(&addr[0]);
nvmem_cfg.size = be32_to_cpup(&addr[1]);
return PTR_ERR_OR_ZERO(devm_nvmem_register(&pdev->dev, &nvmem_cfg));
}
static const struct of_device_id spmi_mfd_nvmem_id_table[] = {
{ .compatible = "apple,spmi-pmu-nvmem" },
{ .compatible = "spmi-mfd-nvmem" },
{ },
};
MODULE_DEVICE_TABLE(of, spmi_mfd_nvmem_id_table);
static struct platform_driver spmi_mfd_nvmem_driver = {
.probe = spmi_mfd_nvmem_probe,
.driver = {
.name = "spmi-mfd-nvmem",
.owner = THIS_MODULE,
.of_match_table = spmi_mfd_nvmem_id_table,
},
};
module_platform_driver(spmi_mfd_nvmem_driver);
MODULE_LICENSE("Dual MIT/GPL");
MODULE_AUTHOR("Hector Martin <marcan@marcan.st>");
MODULE_DESCRIPTION("SPMI MFD NVMEM driver");
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