blob: 60a2939cde6c500d9946f20be336a635e6979f51 [file] [log] [blame]
Thomas Gleixner1802d0b2019-05-27 08:55:21 +02001// SPDX-License-Identifier: GPL-2.0-only
Huang Ying801eab82010-05-18 14:35:17 +08002/*
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.
Huang Ying801eab82010-05-18 14:35:17 +080010 */
11
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/acpi.h>
Huang Ying801eab82010-05-18 14:35:17 +080016#include <acpi/hed.h>
17
Mathias Krause69cda6e2015-06-13 14:26:56 +020018static const struct acpi_device_id acpi_hed_ids[] = {
Huang Ying801eab82010-05-18 14:35:17 +080019 {"PNP0C33", 0},
20 {"", 0},
21};
22MODULE_DEVICE_TABLE(acpi, acpi_hed_ids);
23
24static acpi_handle hed_handle;
25
26static BLOCKING_NOTIFIER_HEAD(acpi_hed_notify_list);
27
28int register_acpi_hed_notifier(struct notifier_block *nb)
29{
30 return blocking_notifier_chain_register(&acpi_hed_notify_list, nb);
31}
32EXPORT_SYMBOL_GPL(register_acpi_hed_notifier);
33
34void unregister_acpi_hed_notifier(struct notifier_block *nb)
35{
36 blocking_notifier_chain_unregister(&acpi_hed_notify_list, nb);
37}
38EXPORT_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 */
45static void acpi_hed_notify(struct acpi_device *device, u32 event)
46{
47 blocking_notifier_call_chain(&acpi_hed_notify_list, 0, NULL);
48}
49
Bill Pembertonda095fd32012-11-19 13:22:46 -050050static int acpi_hed_add(struct acpi_device *device)
Huang Ying801eab82010-05-18 14:35:17 +080051{
52 /* Only one hardware error device */
53 if (hed_handle)
54 return -EINVAL;
55 hed_handle = device->handle;
56 return 0;
57}
58
Rafael J. Wysocki51fac832013-01-24 00:24:48 +010059static int acpi_hed_remove(struct acpi_device *device)
Huang Ying801eab82010-05-18 14:35:17 +080060{
61 hed_handle = NULL;
62 return 0;
63}
64
65static 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};
Mika Westerberg8fe4bf62012-09-07 10:31:41 +030075module_acpi_driver(acpi_hed_driver);
Huang Ying801eab82010-05-18 14:35:17 +080076
Huang Ying801eab82010-05-18 14:35:17 +080077MODULE_AUTHOR("Huang Ying");
78MODULE_DESCRIPTION("ACPI Hardware Error Device Driver");
79MODULE_LICENSE("GPL");