// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) Vaisala Oyj. All rights reserved.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/nvmem-consumer.h>
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#include <linux/platform_device.h>
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#include <linux/reboot-mode.h>
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struct nvmem_reboot_mode {
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struct reboot_mode_driver reboot;
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struct nvmem_cell *cell;
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};
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static int nvmem_reboot_mode_write(struct reboot_mode_driver *reboot,
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unsigned int magic)
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{
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int ret;
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struct nvmem_reboot_mode *nvmem_rbm;
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nvmem_rbm = container_of(reboot, struct nvmem_reboot_mode, reboot);
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ret = nvmem_cell_write(nvmem_rbm->cell, &magic, sizeof(magic));
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if (ret < 0)
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dev_err(reboot->dev, "update reboot mode bits failed\n");
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return ret;
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}
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static int nvmem_reboot_mode_probe(struct platform_device *pdev)
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{
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int ret;
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struct nvmem_reboot_mode *nvmem_rbm;
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nvmem_rbm = devm_kzalloc(&pdev->dev, sizeof(*nvmem_rbm), GFP_KERNEL);
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if (!nvmem_rbm)
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return -ENOMEM;
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nvmem_rbm->reboot.dev = &pdev->dev;
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nvmem_rbm->reboot.write = nvmem_reboot_mode_write;
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nvmem_rbm->cell = devm_nvmem_cell_get(&pdev->dev, "reboot-mode");
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if (IS_ERR(nvmem_rbm->cell)) {
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dev_err(&pdev->dev, "failed to get the nvmem cell reboot-mode\n");
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return PTR_ERR(nvmem_rbm->cell);
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}
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ret = devm_reboot_mode_register(&pdev->dev, &nvmem_rbm->reboot);
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if (ret)
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dev_err(&pdev->dev, "can't register reboot mode\n");
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return ret;
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}
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static const struct of_device_id nvmem_reboot_mode_of_match[] = {
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{ .compatible = "nvmem-reboot-mode" },
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{}
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};
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MODULE_DEVICE_TABLE(of, nvmem_reboot_mode_of_match);
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static struct platform_driver nvmem_reboot_mode_driver = {
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.probe = nvmem_reboot_mode_probe,
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.driver = {
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.name = "nvmem-reboot-mode",
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.of_match_table = nvmem_reboot_mode_of_match,
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},
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};
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module_platform_driver(nvmem_reboot_mode_driver);
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MODULE_AUTHOR("Nandor Han <nandor.han@vaisala.com>");
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MODULE_DESCRIPTION("NVMEM reboot mode driver");
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MODULE_LICENSE("GPL");
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