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7a78a7f7 HN |
1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* | |
3 | * Copyright (c) Vaisala Oyj. All rights reserved. | |
4 | */ | |
5 | ||
6 | #include <linux/init.h> | |
7 | #include <linux/module.h> | |
8 | #include <linux/kernel.h> | |
9 | #include <linux/of.h> | |
10 | #include <linux/nvmem-consumer.h> | |
11 | #include <linux/platform_device.h> | |
12 | #include <linux/reboot-mode.h> | |
13 | ||
14 | struct nvmem_reboot_mode { | |
15 | struct reboot_mode_driver reboot; | |
16 | struct nvmem_cell *cell; | |
17 | }; | |
18 | ||
19 | static int nvmem_reboot_mode_write(struct reboot_mode_driver *reboot, | |
20 | unsigned int magic) | |
21 | { | |
22 | int ret; | |
23 | struct nvmem_reboot_mode *nvmem_rbm; | |
24 | ||
25 | nvmem_rbm = container_of(reboot, struct nvmem_reboot_mode, reboot); | |
26 | ||
27 | ret = nvmem_cell_write(nvmem_rbm->cell, &magic, sizeof(magic)); | |
28 | if (ret < 0) | |
29 | dev_err(reboot->dev, "update reboot mode bits failed\n"); | |
30 | ||
31 | return ret; | |
32 | } | |
33 | ||
34 | static int nvmem_reboot_mode_probe(struct platform_device *pdev) | |
35 | { | |
36 | int ret; | |
37 | struct nvmem_reboot_mode *nvmem_rbm; | |
38 | ||
39 | nvmem_rbm = devm_kzalloc(&pdev->dev, sizeof(*nvmem_rbm), GFP_KERNEL); | |
40 | if (!nvmem_rbm) | |
41 | return -ENOMEM; | |
42 | ||
43 | nvmem_rbm->reboot.dev = &pdev->dev; | |
44 | nvmem_rbm->reboot.write = nvmem_reboot_mode_write; | |
45 | ||
46 | nvmem_rbm->cell = devm_nvmem_cell_get(&pdev->dev, "reboot-mode"); | |
47 | if (IS_ERR(nvmem_rbm->cell)) { | |
48 | dev_err(&pdev->dev, "failed to get the nvmem cell reboot-mode\n"); | |
49 | return PTR_ERR(nvmem_rbm->cell); | |
50 | } | |
51 | ||
52 | ret = devm_reboot_mode_register(&pdev->dev, &nvmem_rbm->reboot); | |
53 | if (ret) | |
54 | dev_err(&pdev->dev, "can't register reboot mode\n"); | |
55 | ||
56 | return ret; | |
57 | } | |
58 | ||
59 | static const struct of_device_id nvmem_reboot_mode_of_match[] = { | |
60 | { .compatible = "nvmem-reboot-mode" }, | |
61 | {} | |
62 | }; | |
63 | MODULE_DEVICE_TABLE(of, nvmem_reboot_mode_of_match); | |
64 | ||
65 | static struct platform_driver nvmem_reboot_mode_driver = { | |
66 | .probe = nvmem_reboot_mode_probe, | |
67 | .driver = { | |
68 | .name = "nvmem-reboot-mode", | |
69 | .of_match_table = nvmem_reboot_mode_of_match, | |
70 | }, | |
71 | }; | |
72 | module_platform_driver(nvmem_reboot_mode_driver); | |
73 | ||
74 | MODULE_AUTHOR("Nandor Han <nandor.han@vaisala.com>"); | |
75 | MODULE_DESCRIPTION("NVMEM reboot mode driver"); | |
76 | MODULE_LICENSE("GPL"); |