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76 lines
1.9 KiB
76 lines
1.9 KiB
// 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 <[email protected]>"); |
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MODULE_DESCRIPTION("NVMEM reboot mode driver"); |
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MODULE_LICENSE("GPL");
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