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1802d0be | 1 | // SPDX-License-Identifier: GPL-2.0-only |
801eab81 HY |
2 | /* |
3 | * ACPI Hardware Error Device (PNP0C33) Driver | |
4 | * | |
5 | * Copyright (C) 2010, Intel Corp. | |
6 | * Author: Huang Ying <ying.huang@intel.com> | |
7 | * | |
8 | * ACPI Hardware Error Device is used to report some hardware errors | |
9 | * notified via SCI, mainly the corrected errors. | |
801eab81 HY |
10 | */ |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/acpi.h> | |
801eab81 HY |
16 | #include <acpi/hed.h> |
17 | ||
69cda6e0 | 18 | static const struct acpi_device_id acpi_hed_ids[] = { |
801eab81 HY |
19 | {"PNP0C33", 0}, |
20 | {"", 0}, | |
21 | }; | |
22 | MODULE_DEVICE_TABLE(acpi, acpi_hed_ids); | |
23 | ||
24 | static acpi_handle hed_handle; | |
25 | ||
26 | static BLOCKING_NOTIFIER_HEAD(acpi_hed_notify_list); | |
27 | ||
28 | int register_acpi_hed_notifier(struct notifier_block *nb) | |
29 | { | |
30 | return blocking_notifier_chain_register(&acpi_hed_notify_list, nb); | |
31 | } | |
32 | EXPORT_SYMBOL_GPL(register_acpi_hed_notifier); | |
33 | ||
34 | void unregister_acpi_hed_notifier(struct notifier_block *nb) | |
35 | { | |
36 | blocking_notifier_chain_unregister(&acpi_hed_notify_list, nb); | |
37 | } | |
38 | EXPORT_SYMBOL_GPL(unregister_acpi_hed_notifier); | |
39 | ||
40 | /* | |
41 | * SCI to report hardware error is forwarded to the listeners of HED, | |
42 | * it is used by HEST Generic Hardware Error Source with notify type | |
43 | * SCI. | |
44 | */ | |
45 | static void acpi_hed_notify(struct acpi_device *device, u32 event) | |
46 | { | |
47 | blocking_notifier_call_chain(&acpi_hed_notify_list, 0, NULL); | |
48 | } | |
49 | ||
da095fd3 | 50 | static int acpi_hed_add(struct acpi_device *device) |
801eab81 HY |
51 | { |
52 | /* Only one hardware error device */ | |
53 | if (hed_handle) | |
54 | return -EINVAL; | |
55 | hed_handle = device->handle; | |
56 | return 0; | |
57 | } | |
58 | ||
51fac838 | 59 | static int acpi_hed_remove(struct acpi_device *device) |
801eab81 HY |
60 | { |
61 | hed_handle = NULL; | |
62 | return 0; | |
63 | } | |
64 | ||
65 | static struct acpi_driver acpi_hed_driver = { | |
66 | .name = "hardware_error_device", | |
67 | .class = "hardware_error", | |
68 | .ids = acpi_hed_ids, | |
69 | .ops = { | |
70 | .add = acpi_hed_add, | |
71 | .remove = acpi_hed_remove, | |
72 | .notify = acpi_hed_notify, | |
73 | }, | |
74 | }; | |
8fe4bf6f | 75 | module_acpi_driver(acpi_hed_driver); |
801eab81 HY |
76 | |
77 | ACPI_MODULE_NAME("hed"); | |
78 | MODULE_AUTHOR("Huang Ying"); | |
79 | MODULE_DESCRIPTION("ACPI Hardware Error Device Driver"); | |
80 | MODULE_LICENSE("GPL"); |