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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
18static const struct acpi_device_id acpi_hed_ids[] = {
19 {"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
50static int acpi_hed_add(struct acpi_device *device)
51{
52 /* Only one hardware error device */
53 if (hed_handle)
54 return -EINVAL;
55 hed_handle = device->handle;
56 return 0;
57}
58
59static int acpi_hed_remove(struct acpi_device *device)
60{
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};
75module_acpi_driver(acpi_hed_driver);
76
77ACPI_MODULE_NAME("hed");
78MODULE_AUTHOR("Huang Ying");
79MODULE_DESCRIPTION("ACPI Hardware Error Device Driver");
80MODULE_LICENSE("GPL");
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 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24#include <linux/kernel.h>
25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/acpi.h>
28#include <acpi/acpi_bus.h>
29#include <acpi/acpi_drivers.h>
30#include <acpi/hed.h>
31
32static struct acpi_device_id acpi_hed_ids[] = {
33 {"PNP0C33", 0},
34 {"", 0},
35};
36MODULE_DEVICE_TABLE(acpi, acpi_hed_ids);
37
38static acpi_handle hed_handle;
39
40static BLOCKING_NOTIFIER_HEAD(acpi_hed_notify_list);
41
42int register_acpi_hed_notifier(struct notifier_block *nb)
43{
44 return blocking_notifier_chain_register(&acpi_hed_notify_list, nb);
45}
46EXPORT_SYMBOL_GPL(register_acpi_hed_notifier);
47
48void unregister_acpi_hed_notifier(struct notifier_block *nb)
49{
50 blocking_notifier_chain_unregister(&acpi_hed_notify_list, nb);
51}
52EXPORT_SYMBOL_GPL(unregister_acpi_hed_notifier);
53
54/*
55 * SCI to report hardware error is forwarded to the listeners of HED,
56 * it is used by HEST Generic Hardware Error Source with notify type
57 * SCI.
58 */
59static void acpi_hed_notify(struct acpi_device *device, u32 event)
60{
61 blocking_notifier_call_chain(&acpi_hed_notify_list, 0, NULL);
62}
63
64static int __devinit acpi_hed_add(struct acpi_device *device)
65{
66 /* Only one hardware error device */
67 if (hed_handle)
68 return -EINVAL;
69 hed_handle = device->handle;
70 return 0;
71}
72
73static int __devexit acpi_hed_remove(struct acpi_device *device, int type)
74{
75 hed_handle = NULL;
76 return 0;
77}
78
79static struct acpi_driver acpi_hed_driver = {
80 .name = "hardware_error_device",
81 .class = "hardware_error",
82 .ids = acpi_hed_ids,
83 .ops = {
84 .add = acpi_hed_add,
85 .remove = acpi_hed_remove,
86 .notify = acpi_hed_notify,
87 },
88};
89
90static int __init acpi_hed_init(void)
91{
92 if (acpi_disabled)
93 return -ENODEV;
94
95 if (acpi_bus_register_driver(&acpi_hed_driver) < 0)
96 return -ENODEV;
97
98 return 0;
99}
100
101static void __exit acpi_hed_exit(void)
102{
103 acpi_bus_unregister_driver(&acpi_hed_driver);
104}
105
106module_init(acpi_hed_init);
107module_exit(acpi_hed_exit);
108
109ACPI_MODULE_NAME("hed");
110MODULE_AUTHOR("Huang Ying");
111MODULE_DESCRIPTION("ACPI Hardware Error Device Driver");
112MODULE_LICENSE("GPL");