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 <linux/platform_device.h>
17 #include <acpi/hed.h>
18
19 static const struct acpi_device_id acpi_hed_ids[] = {
20 {"PNP0C33", 0},
21 {"", 0},
22 };
23 MODULE_DEVICE_TABLE(acpi, acpi_hed_ids);
24
25 static acpi_handle hed_handle;
26
27 static BLOCKING_NOTIFIER_HEAD(acpi_hed_notify_list);
28
register_acpi_hed_notifier(struct notifier_block * nb)29 int register_acpi_hed_notifier(struct notifier_block *nb)
30 {
31 return blocking_notifier_chain_register(&acpi_hed_notify_list, nb);
32 }
33 EXPORT_SYMBOL_GPL(register_acpi_hed_notifier);
34
unregister_acpi_hed_notifier(struct notifier_block * nb)35 void unregister_acpi_hed_notifier(struct notifier_block *nb)
36 {
37 blocking_notifier_chain_unregister(&acpi_hed_notify_list, nb);
38 }
39 EXPORT_SYMBOL_GPL(unregister_acpi_hed_notifier);
40
41 /*
42 * SCI to report hardware error is forwarded to the listeners of HED,
43 * it is used by HEST Generic Hardware Error Source with notify type
44 * SCI.
45 */
acpi_hed_notify(acpi_handle handle,u32 event,void * data)46 static void acpi_hed_notify(acpi_handle handle, u32 event, void *data)
47 {
48 blocking_notifier_call_chain(&acpi_hed_notify_list, 0, NULL);
49 }
50
acpi_hed_probe(struct platform_device * pdev)51 static int acpi_hed_probe(struct platform_device *pdev)
52 {
53 struct acpi_device *device;
54 int err;
55
56 device = ACPI_COMPANION(&pdev->dev);
57 if (!device)
58 return -ENODEV;
59
60 /* Only one hardware error device */
61 if (hed_handle)
62 return -EINVAL;
63 hed_handle = device->handle;
64
65 err = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY,
66 acpi_hed_notify, device);
67 if (err)
68 hed_handle = NULL;
69
70 return err;
71 }
72
acpi_hed_remove(struct platform_device * pdev)73 static void acpi_hed_remove(struct platform_device *pdev)
74 {
75 struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
76
77 acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY,
78 acpi_hed_notify);
79 hed_handle = NULL;
80 }
81
82 static struct platform_driver acpi_hed_driver = {
83 .probe = acpi_hed_probe,
84 .remove = acpi_hed_remove,
85 .driver = {
86 .name = "acpi-hardware-error-device",
87 .acpi_match_table = acpi_hed_ids,
88 },
89 };
90
acpi_hed_driver_init(void)91 static int __init acpi_hed_driver_init(void)
92 {
93 return platform_driver_register(&acpi_hed_driver);
94 }
95 subsys_initcall(acpi_hed_driver_init);
96
97 MODULE_AUTHOR("Huang Ying");
98 MODULE_DESCRIPTION("ACPI Hardware Error Device Driver");
99 MODULE_LICENSE("GPL");
100