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
register_acpi_hed_notifier(struct notifier_block * nb)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
unregister_acpi_hed_notifier(struct notifier_block * nb)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 */
acpi_hed_notify(struct acpi_device * device,u32 event)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
acpi_hed_add(struct acpi_device * device)50 static 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
acpi_hed_remove(struct acpi_device * device)59 static int acpi_hed_remove(struct acpi_device *device)
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 };
75 module_acpi_driver(acpi_hed_driver);
76
77 MODULE_AUTHOR("Huang Ying");
78 MODULE_DESCRIPTION("ACPI Hardware Error Device Driver");
79 MODULE_LICENSE("GPL");
80