| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame] | 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 | |
| 26 | static const struct acpi_device_id acpi_hed_ids[] = { |
| 27 | {"PNP0C33", 0}, |
| 28 | {"", 0}, |
| 29 | }; |
| 30 | MODULE_DEVICE_TABLE(acpi, acpi_hed_ids); |
| 31 | |
| 32 | static acpi_handle hed_handle; |
| 33 | |
| 34 | static BLOCKING_NOTIFIER_HEAD(acpi_hed_notify_list); |
| 35 | |
| 36 | int register_acpi_hed_notifier(struct notifier_block *nb) |
| 37 | { |
| 38 | return blocking_notifier_chain_register(&acpi_hed_notify_list, nb); |
| 39 | } |
| 40 | EXPORT_SYMBOL_GPL(register_acpi_hed_notifier); |
| 41 | |
| 42 | void unregister_acpi_hed_notifier(struct notifier_block *nb) |
| 43 | { |
| 44 | blocking_notifier_chain_unregister(&acpi_hed_notify_list, nb); |
| 45 | } |
| 46 | EXPORT_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 | */ |
| 53 | static void acpi_hed_notify(struct acpi_device *device, u32 event) |
| 54 | { |
| 55 | blocking_notifier_call_chain(&acpi_hed_notify_list, 0, NULL); |
| 56 | } |
| 57 | |
| 58 | static 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 | |
| 67 | static int acpi_hed_remove(struct acpi_device *device) |
| 68 | { |
| 69 | hed_handle = NULL; |
| 70 | return 0; |
| 71 | } |
| 72 | |
| 73 | static 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 | }; |
| 83 | module_acpi_driver(acpi_hed_driver); |
| 84 | |
| 85 | ACPI_MODULE_NAME("hed"); |
| 86 | MODULE_AUTHOR("Huang Ying"); |
| 87 | MODULE_DESCRIPTION("ACPI Hardware Error Device Driver"); |
| 88 | MODULE_LICENSE("GPL"); |