| Huang Ying | 801eab8 | 2010-05-18 14:35:17 +0800 | [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 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to the Free Software |
| 21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 22 | */ |
| 23 | |
| 24 | #include <linux/kernel.h> |
| 25 | #include <linux/module.h> |
| 26 | #include <linux/init.h> |
| 27 | #include <linux/acpi.h> |
| 28 | #include <acpi/acpi_bus.h> |
| 29 | #include <acpi/acpi_drivers.h> |
| 30 | #include <acpi/hed.h> |
| 31 | |
| 32 | static struct acpi_device_id acpi_hed_ids[] = { |
| 33 | {"PNP0C33", 0}, |
| 34 | {"", 0}, |
| 35 | }; |
| 36 | MODULE_DEVICE_TABLE(acpi, acpi_hed_ids); |
| 37 | |
| 38 | static acpi_handle hed_handle; |
| 39 | |
| 40 | static BLOCKING_NOTIFIER_HEAD(acpi_hed_notify_list); |
| 41 | |
| 42 | int register_acpi_hed_notifier(struct notifier_block *nb) |
| 43 | { |
| 44 | return blocking_notifier_chain_register(&acpi_hed_notify_list, nb); |
| 45 | } |
| 46 | EXPORT_SYMBOL_GPL(register_acpi_hed_notifier); |
| 47 | |
| 48 | void unregister_acpi_hed_notifier(struct notifier_block *nb) |
| 49 | { |
| 50 | blocking_notifier_chain_unregister(&acpi_hed_notify_list, nb); |
| 51 | } |
| 52 | EXPORT_SYMBOL_GPL(unregister_acpi_hed_notifier); |
| 53 | |
| 54 | /* |
| 55 | * SCI to report hardware error is forwarded to the listeners of HED, |
| 56 | * it is used by HEST Generic Hardware Error Source with notify type |
| 57 | * SCI. |
| 58 | */ |
| 59 | static void acpi_hed_notify(struct acpi_device *device, u32 event) |
| 60 | { |
| 61 | blocking_notifier_call_chain(&acpi_hed_notify_list, 0, NULL); |
| 62 | } |
| 63 | |
| 64 | static int __devinit acpi_hed_add(struct acpi_device *device) |
| 65 | { |
| 66 | /* Only one hardware error device */ |
| 67 | if (hed_handle) |
| 68 | return -EINVAL; |
| 69 | hed_handle = device->handle; |
| 70 | return 0; |
| 71 | } |
| 72 | |
| 73 | static int __devexit acpi_hed_remove(struct acpi_device *device, int type) |
| 74 | { |
| 75 | hed_handle = NULL; |
| 76 | return 0; |
| 77 | } |
| 78 | |
| 79 | static struct acpi_driver acpi_hed_driver = { |
| 80 | .name = "hardware_error_device", |
| 81 | .class = "hardware_error", |
| 82 | .ids = acpi_hed_ids, |
| 83 | .ops = { |
| 84 | .add = acpi_hed_add, |
| 85 | .remove = acpi_hed_remove, |
| 86 | .notify = acpi_hed_notify, |
| 87 | }, |
| 88 | }; |
| 89 | |
| 90 | static int __init acpi_hed_init(void) |
| 91 | { |
| 92 | if (acpi_disabled) |
| 93 | return -ENODEV; |
| 94 | |
| 95 | if (acpi_bus_register_driver(&acpi_hed_driver) < 0) |
| 96 | return -ENODEV; |
| 97 | |
| 98 | return 0; |
| 99 | } |
| 100 | |
| 101 | static void __exit acpi_hed_exit(void) |
| 102 | { |
| 103 | acpi_bus_unregister_driver(&acpi_hed_driver); |
| 104 | } |
| 105 | |
| 106 | module_init(acpi_hed_init); |
| 107 | module_exit(acpi_hed_exit); |
| 108 | |
| 109 | ACPI_MODULE_NAME("hed"); |
| 110 | MODULE_AUTHOR("Huang Ying"); |
| 111 | MODULE_DESCRIPTION("ACPI Hardware Error Device Driver"); |
| 112 | MODULE_LICENSE("GPL"); |