1/*
2 * ACPI Hardware Error Device (PNP0C33) Driver
3 *
4 * Copyright (C) 2010, Intel Corp.
5 * Author: Huang Ying <ying.huang@intel.com>
6 *
7 * ACPI Hardware Error Device is used to report some hardware errors
8 * notified via SCI, mainly the corrected errors.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License version
12 * 2 as published by the Free Software Foundation;
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 */
19
20#include <linux/kernel.h>
21#include <linux/module.h>
22#include <linux/init.h>
23#include <linux/acpi.h>
24#include <acpi/hed.h>
25
26static const struct acpi_device_id acpi_hed_ids[] = {
27 {"PNP0C33", 0},
28 {"", 0},
29};
30MODULE_DEVICE_TABLE(acpi, acpi_hed_ids);
31
32static acpi_handle hed_handle;
33
34static BLOCKING_NOTIFIER_HEAD(acpi_hed_notify_list);
35
36int register_acpi_hed_notifier(struct notifier_block *nb)
37{
38 return blocking_notifier_chain_register(&acpi_hed_notify_list, nb);
39}
40EXPORT_SYMBOL_GPL(register_acpi_hed_notifier);
41
42void unregister_acpi_hed_notifier(struct notifier_block *nb)
43{
44 blocking_notifier_chain_unregister(&acpi_hed_notify_list, nb);
45}
46EXPORT_SYMBOL_GPL(unregister_acpi_hed_notifier);
47
48/*
49 * SCI to report hardware error is forwarded to the listeners of HED,
50 * it is used by HEST Generic Hardware Error Source with notify type
51 * SCI.
52 */
53static void acpi_hed_notify(struct acpi_device *device, u32 event)
54{
55 blocking_notifier_call_chain(&acpi_hed_notify_list, 0, NULL);
56}
57
58static int acpi_hed_add(struct acpi_device *device)
59{
60 /* Only one hardware error device */
61 if (hed_handle)
62 return -EINVAL;
63 hed_handle = device->handle;
64 return 0;
65}
66
67static int acpi_hed_remove(struct acpi_device *device)
68{
69 hed_handle = NULL;
70 return 0;
71}
72
73static struct acpi_driver acpi_hed_driver = {
74 .name = "hardware_error_device",
75 .class = "hardware_error",
76 .ids = acpi_hed_ids,
77 .ops = {
78 .add = acpi_hed_add,
79 .remove = acpi_hed_remove,
80 .notify = acpi_hed_notify,
81 },
82};
83module_acpi_driver(acpi_hed_driver);
84
85ACPI_MODULE_NAME("hed");
86MODULE_AUTHOR("Huang Ying");
87MODULE_DESCRIPTION("ACPI Hardware Error Device Driver");
88MODULE_LICENSE("GPL");
89