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(acpi_handle handle,u32 event,void * data)45 static void acpi_hed_notify(acpi_handle handle, u32 event, void *data)
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 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(device, ACPI_DEVICE_NOTIFY,
60 acpi_hed_notify);
61 if (err)
62 hed_handle = NULL;
63
64 return err;
65 }
66
acpi_hed_remove(struct acpi_device * device)67 static void acpi_hed_remove(struct acpi_device *device)
68 {
69 acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY,
70 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