projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1802d0be | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 801eab81 HY |
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. | |
| 801eab81 HY |
10 | */ |
| 11 | ||
| 12 | #include <linux/kernel.h> | |
| 13 | #include <linux/module.h> | |
| 14 | #include <linux/init.h> | |
| 15 | #include <linux/acpi.h> | |
| 801eab81 HY |
16 | #include <acpi/hed.h> |
| 17 | ||
| 69cda6e0 | 18 | static const struct acpi_device_id acpi_hed_ids[] = { |
| 801eab81 HY |
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 | ||
| 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 | ||
| 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 | */ | |
| 898ff0f0 | 45 | static void acpi_hed_notify(acpi_handle handle, u32 event, void *data) |
| 801eab81 HY |
46 | { |
| 47 | blocking_notifier_call_chain(&acpi_hed_notify_list, 0, NULL); | |
| 48 | } | |
| 49 | ||
| da095fd3 | 50 | static int acpi_hed_add(struct acpi_device *device) |
| 801eab81 | 51 | { |
| 898ff0f0 MW |
52 | int err; |
| 53 | ||
| 801eab81 HY |
54 | /* Only one hardware error device */ |
| 55 | if (hed_handle) | |
| 56 | return -EINVAL; | |
| 57 | hed_handle = device->handle; | |
| 898ff0f0 MW |
58 | |
| 59 | err = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY, | |
| 470508f6 | 60 | acpi_hed_notify, device); |
| 898ff0f0 MW |
61 | if (err) |
| 62 | hed_handle = NULL; | |
| 63 | ||
| 64 | return err; | |
| 801eab81 HY |
65 | } |
| 66 | ||
| 6c0eb5ba | 67 | static void acpi_hed_remove(struct acpi_device *device) |
| 801eab81 | 68 | { |
| 898ff0f0 MW |
69 | acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY, |
| 70 | acpi_hed_notify); | |
| 801eab81 | 71 | hed_handle = NULL; |
| 801eab81 HY |
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, | |
| 801eab81 HY |
81 | }, |
| 82 | }; | |
| 8fe4bf6f | 83 | module_acpi_driver(acpi_hed_driver); |
| 801eab81 | 84 | |
| 801eab81 HY |
85 | MODULE_AUTHOR("Huang Ying"); |
| 86 | MODULE_DESCRIPTION("ACPI Hardware Error Device Driver"); | |
| 87 | MODULE_LICENSE("GPL"); |