mirror of
https://github.com/torvalds/linux.git
synced 2024-11-30 16:11:38 +00:00
7a78a7f769
Add a new reboot mode write interface that is using an NVMEM cell to store the reboot mode magic. Signed-off-by: Nandor Han <nandor.han@vaisala.com> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (c) Vaisala Oyj. All rights reserved.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/of.h>
|
|
#include <linux/nvmem-consumer.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/reboot-mode.h>
|
|
|
|
struct nvmem_reboot_mode {
|
|
struct reboot_mode_driver reboot;
|
|
struct nvmem_cell *cell;
|
|
};
|
|
|
|
static int nvmem_reboot_mode_write(struct reboot_mode_driver *reboot,
|
|
unsigned int magic)
|
|
{
|
|
int ret;
|
|
struct nvmem_reboot_mode *nvmem_rbm;
|
|
|
|
nvmem_rbm = container_of(reboot, struct nvmem_reboot_mode, reboot);
|
|
|
|
ret = nvmem_cell_write(nvmem_rbm->cell, &magic, sizeof(magic));
|
|
if (ret < 0)
|
|
dev_err(reboot->dev, "update reboot mode bits failed\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int nvmem_reboot_mode_probe(struct platform_device *pdev)
|
|
{
|
|
int ret;
|
|
struct nvmem_reboot_mode *nvmem_rbm;
|
|
|
|
nvmem_rbm = devm_kzalloc(&pdev->dev, sizeof(*nvmem_rbm), GFP_KERNEL);
|
|
if (!nvmem_rbm)
|
|
return -ENOMEM;
|
|
|
|
nvmem_rbm->reboot.dev = &pdev->dev;
|
|
nvmem_rbm->reboot.write = nvmem_reboot_mode_write;
|
|
|
|
nvmem_rbm->cell = devm_nvmem_cell_get(&pdev->dev, "reboot-mode");
|
|
if (IS_ERR(nvmem_rbm->cell)) {
|
|
dev_err(&pdev->dev, "failed to get the nvmem cell reboot-mode\n");
|
|
return PTR_ERR(nvmem_rbm->cell);
|
|
}
|
|
|
|
ret = devm_reboot_mode_register(&pdev->dev, &nvmem_rbm->reboot);
|
|
if (ret)
|
|
dev_err(&pdev->dev, "can't register reboot mode\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct of_device_id nvmem_reboot_mode_of_match[] = {
|
|
{ .compatible = "nvmem-reboot-mode" },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, nvmem_reboot_mode_of_match);
|
|
|
|
static struct platform_driver nvmem_reboot_mode_driver = {
|
|
.probe = nvmem_reboot_mode_probe,
|
|
.driver = {
|
|
.name = "nvmem-reboot-mode",
|
|
.of_match_table = nvmem_reboot_mode_of_match,
|
|
},
|
|
};
|
|
module_platform_driver(nvmem_reboot_mode_driver);
|
|
|
|
MODULE_AUTHOR("Nandor Han <nandor.han@vaisala.com>");
|
|
MODULE_DESCRIPTION("NVMEM reboot mode driver");
|
|
MODULE_LICENSE("GPL");
|