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"); 89