114 lines
2.7 KiB
C
Executable File
114 lines
2.7 KiB
C
Executable File
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2019, 2021 The Linux Foundation. All rights reserved.
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* Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
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*/
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/reboot.h>
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#include <linux/pm.h>
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#include <linux/of_address.h>
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#include <linux/nvmem-consumer.h>
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struct qcom_reboot_reason {
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struct device *dev;
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struct notifier_block reboot_nb;
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struct nvmem_cell *nvmem_cell;
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};
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struct poweroff_reason {
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const char *cmd;
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unsigned char pon_reason;
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};
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static struct poweroff_reason reasons[] = {
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{ "recovery", 0x01 },
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{ "bootloader", 0x02 },
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{ "rtc", 0x03 },
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{ "dm-verity device corrupted", 0x04 },
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{ "dm-verity enforcing", 0x05 },
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{ "keys clear", 0x06 },
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{}
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};
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static int qcom_reboot_reason_reboot(struct notifier_block *this,
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unsigned long event, void *ptr)
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{
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char *cmd = ptr;
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struct qcom_reboot_reason *reboot = container_of(this,
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struct qcom_reboot_reason, reboot_nb);
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struct poweroff_reason *reason;
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if (!cmd)
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return NOTIFY_OK;
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for (reason = reasons; reason->cmd; reason++) {
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if (!strcmp(cmd, reason->cmd)) {
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nvmem_cell_write(reboot->nvmem_cell,
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&reason->pon_reason,
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sizeof(reason->pon_reason));
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break;
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}
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}
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return NOTIFY_OK;
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}
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static int qcom_reboot_reason_probe(struct platform_device *pdev)
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{
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struct qcom_reboot_reason *reboot;
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reboot = devm_kzalloc(&pdev->dev, sizeof(*reboot), GFP_KERNEL);
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if (!reboot)
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return -ENOMEM;
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reboot->dev = &pdev->dev;
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reboot->nvmem_cell = nvmem_cell_get(reboot->dev, "restart_reason");
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if (IS_ERR(reboot->nvmem_cell))
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return PTR_ERR(reboot->nvmem_cell);
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reboot->reboot_nb.notifier_call = qcom_reboot_reason_reboot;
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reboot->reboot_nb.priority = 255;
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register_reboot_notifier(&reboot->reboot_nb);
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platform_set_drvdata(pdev, reboot);
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return 0;
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}
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static int qcom_reboot_reason_remove(struct platform_device *pdev)
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{
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struct qcom_reboot_reason *reboot = platform_get_drvdata(pdev);
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unregister_reboot_notifier(&reboot->reboot_nb);
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return 0;
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}
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static const struct of_device_id of_qcom_reboot_reason_match[] = {
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{ .compatible = "qcom,reboot-reason", },
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{},
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};
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MODULE_DEVICE_TABLE(of, of_qcom_reboot_reason_match);
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static struct platform_driver qcom_reboot_reason_driver = {
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.probe = qcom_reboot_reason_probe,
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.remove = qcom_reboot_reason_remove,
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.driver = {
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.name = "qcom-reboot-reason",
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.of_match_table = of_match_ptr(of_qcom_reboot_reason_match),
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},
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};
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module_platform_driver(qcom_reboot_reason_driver);
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MODULE_DESCRIPTION("MSM Reboot Reason Driver");
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MODULE_LICENSE("GPL");
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