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 <linux/platform_device.h> 17 #include <acpi/hed.h> 18 19 static const struct acpi_device_id acpi_hed_ids[] = { 20 {"PNP0C33", 0}, 21 {"", 0}, 22 }; 23 MODULE_DEVICE_TABLE(acpi, acpi_hed_ids); 24 25 static bool hed_present; 26 27 static BLOCKING_NOTIFIER_HEAD(acpi_hed_notify_list); 28 29 int register_acpi_hed_notifier(struct notifier_block *nb) 30 { 31 return blocking_notifier_chain_register(&acpi_hed_notify_list, nb); 32 } 33 EXPORT_SYMBOL_GPL(register_acpi_hed_notifier); 34 35 void unregister_acpi_hed_notifier(struct notifier_block *nb) 36 { 37 blocking_notifier_chain_unregister(&acpi_hed_notify_list, nb); 38 } 39 EXPORT_SYMBOL_GPL(unregister_acpi_hed_notifier); 40 41 /* 42 * SCI to report hardware error is forwarded to the listeners of HED, 43 * it is used by HEST Generic Hardware Error Source with notify type 44 * SCI. 45 */ 46 static void acpi_hed_notify(acpi_handle handle, u32 event, void *data) 47 { 48 blocking_notifier_call_chain(&acpi_hed_notify_list, 0, NULL); 49 } 50 51 static int acpi_hed_probe(struct platform_device *pdev) 52 { 53 int err; 54 55 /* Only one hardware error device */ 56 if (hed_present) 57 return -EINVAL; 58 59 err = devm_acpi_install_notify_handler(&pdev->dev, ACPI_DEVICE_NOTIFY, 60 acpi_hed_notify, NULL); 61 if (err) 62 return err; 63 64 hed_present = true; 65 return 0; 66 } 67 68 static void acpi_hed_remove(struct platform_device *pdev) 69 { 70 hed_present = false; 71 } 72 73 static struct platform_driver acpi_hed_driver = { 74 .probe = acpi_hed_probe, 75 .remove = acpi_hed_remove, 76 .driver = { 77 .name = "acpi-hardware-error-device", 78 .acpi_match_table = acpi_hed_ids, 79 }, 80 }; 81 82 static int __init acpi_hed_driver_init(void) 83 { 84 return platform_driver_register(&acpi_hed_driver); 85 } 86 subsys_initcall(acpi_hed_driver_init); 87 88 MODULE_AUTHOR("Huang Ying"); 89 MODULE_DESCRIPTION("ACPI Hardware Error Device Driver"); 90 MODULE_LICENSE("GPL"); 91