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 32static struct acpi_device_id acpi_hed_ids[] = { 33 {"PNP0C33", 0}, 34 {"", 0}, 35}; 36MODULE_DEVICE_TABLE(acpi, acpi_hed_ids); 37 38static acpi_handle hed_handle; 39 40static BLOCKING_NOTIFIER_HEAD(acpi_hed_notify_list); 41 42int register_acpi_hed_notifier(struct notifier_block *nb) 43{ 44 return blocking_notifier_chain_register(&acpi_hed_notify_list, nb); 45} 46EXPORT_SYMBOL_GPL(register_acpi_hed_notifier); 47 48void unregister_acpi_hed_notifier(struct notifier_block *nb) 49{ 50 blocking_notifier_chain_unregister(&acpi_hed_notify_list, nb); 51} 52EXPORT_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 */ 59static void acpi_hed_notify(struct acpi_device *device, u32 event) 60{ 61 blocking_notifier_call_chain(&acpi_hed_notify_list, 0, NULL); 62} 63 64static 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 73static int __devexit acpi_hed_remove(struct acpi_device *device, int type) 74{ 75 hed_handle = NULL; 76 return 0; 77} 78 79static 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 90static 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 101static void __exit acpi_hed_exit(void) 102{ 103 acpi_bus_unregister_driver(&acpi_hed_driver); 104} 105 106module_init(acpi_hed_init); 107module_exit(acpi_hed_exit); 108 109ACPI_MODULE_NAME("hed"); 110MODULE_AUTHOR("Huang Ying"); 111MODULE_DESCRIPTION("ACPI Hardware Error Device Driver"); 112MODULE_LICENSE("GPL"); 113