1 // SPDX-License-Identifier: GPL-2.0-only 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. 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/init.h> 15 #include <linux/acpi.h> 16 #include <acpi/hed.h> 17 18 static const struct acpi_device_id acpi_hed_ids[] = { 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 */ 45 static void acpi_hed_notify(acpi_handle handle, u32 event, void *data) 46 { 47 blocking_notifier_call_chain(&acpi_hed_notify_list, 0, NULL); 48 } 49 50 static int acpi_hed_add(struct acpi_device *device) 51 { 52 int err; 53 54 /* Only one hardware error device */ 55 if (hed_handle) 56 return -EINVAL; 57 hed_handle = device->handle; 58 59 err = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY, 60 acpi_hed_notify); 61 if (err) 62 hed_handle = NULL; 63 64 return err; 65 } 66 67 static void acpi_hed_remove(struct acpi_device *device) 68 { 69 acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY, 70 acpi_hed_notify); 71 hed_handle = NULL; 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, 81 }, 82 }; 83 module_acpi_driver(acpi_hed_driver); 84 85 MODULE_AUTHOR("Huang Ying"); 86 MODULE_DESCRIPTION("ACPI Hardware Error Device Driver"); 87 MODULE_LICENSE("GPL"); 88