1 | // SPDX-License-Identifier: GPL-2.0-only |
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. |
10 | */ |
11 | |
12 | #include <linux/kernel.h> |
13 | #include <linux/module.h> |
14 | #include <linux/init.h> |
15 | #include <linux/acpi.h> |
16 | #include <acpi/hed.h> |
17 | |
18 | static const struct acpi_device_id acpi_hed_ids[] = { |
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(nh: &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(nh: &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(acpi_handle handle, u32 event, void *data) |
46 | { |
47 | blocking_notifier_call_chain(nh: &acpi_hed_notify_list, val: 0, NULL); |
48 | } |
49 | |
50 | static int acpi_hed_add(struct acpi_device *device) |
51 | { |
52 | int err; |
53 | |
54 | /* Only one hardware error device */ |
55 | if (hed_handle) |
56 | return -EINVAL; |
57 | hed_handle = device->handle; |
58 | |
59 | err = acpi_dev_install_notify_handler(adev: device, ACPI_DEVICE_NOTIFY, |
60 | handler: acpi_hed_notify, context: device); |
61 | if (err) |
62 | hed_handle = NULL; |
63 | |
64 | return err; |
65 | } |
66 | |
67 | static void acpi_hed_remove(struct acpi_device *device) |
68 | { |
69 | acpi_dev_remove_notify_handler(adev: device, ACPI_DEVICE_NOTIFY, |
70 | handler: acpi_hed_notify); |
71 | hed_handle = NULL; |
72 | } |
73 | |
74 | static struct acpi_driver acpi_hed_driver = { |
75 | .name = "hardware_error_device" , |
76 | .class = "hardware_error" , |
77 | .ids = acpi_hed_ids, |
78 | .ops = { |
79 | .add = acpi_hed_add, |
80 | .remove = acpi_hed_remove, |
81 | }, |
82 | }; |
83 | module_acpi_driver(acpi_hed_driver); |
84 | |
85 | MODULE_AUTHOR("Huang Ying" ); |
86 | MODULE_DESCRIPTION("ACPI Hardware Error Device Driver" ); |
87 | MODULE_LICENSE("GPL" ); |
88 | |