Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Copyright (c) Vaisala Oyj. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/nvmem-consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/reboot-mode.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) struct nvmem_reboot_mode {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 	struct reboot_mode_driver reboot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 	struct nvmem_cell *cell;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) static int nvmem_reboot_mode_write(struct reboot_mode_driver *reboot,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 				    unsigned int magic)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	struct nvmem_reboot_mode *nvmem_rbm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	nvmem_rbm = container_of(reboot, struct nvmem_reboot_mode, reboot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	ret = nvmem_cell_write(nvmem_rbm->cell, &magic, sizeof(magic));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 		dev_err(reboot->dev, "update reboot mode bits failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) static int nvmem_reboot_mode_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	struct nvmem_reboot_mode *nvmem_rbm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	nvmem_rbm = devm_kzalloc(&pdev->dev, sizeof(*nvmem_rbm), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	if (!nvmem_rbm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	nvmem_rbm->reboot.dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	nvmem_rbm->reboot.write = nvmem_reboot_mode_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	nvmem_rbm->cell = devm_nvmem_cell_get(&pdev->dev, "reboot-mode");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	if (IS_ERR(nvmem_rbm->cell)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 		dev_err(&pdev->dev, "failed to get the nvmem cell reboot-mode\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 		return PTR_ERR(nvmem_rbm->cell);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	ret = devm_reboot_mode_register(&pdev->dev, &nvmem_rbm->reboot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 		dev_err(&pdev->dev, "can't register reboot mode\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) static const struct of_device_id nvmem_reboot_mode_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	{ .compatible = "nvmem-reboot-mode" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	{}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) MODULE_DEVICE_TABLE(of, nvmem_reboot_mode_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static struct platform_driver nvmem_reboot_mode_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	.probe = nvmem_reboot_mode_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 		.name = "nvmem-reboot-mode",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 		.of_match_table = nvmem_reboot_mode_of_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) module_platform_driver(nvmem_reboot_mode_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) MODULE_AUTHOR("Nandor Han <nandor.han@vaisala.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) MODULE_DESCRIPTION("NVMEM reboot mode driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) MODULE_LICENSE("GPL");