drivers/acpi/hed.c

   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(struct acpi_device *device, u32 event)
  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         /* Only one hardware error device */
  53         if (hed_handle)
  54                 return -EINVAL;
  55         hed_handle = device->handle;
  56         return 0;
  57 }
  58
  59 static int acpi_hed_remove(struct acpi_device *device)
  60 {
  61         hed_handle = NULL;
  62         return 0;
  63 }
  64
  65 static struct acpi_driver acpi_hed_driver = {
  66         .name = "hardware_error_device",
  67         .class = "hardware_error",
  68         .ids = acpi_hed_ids,
  69         .ops = {
  70                 .add = acpi_hed_add,
  71                 .remove = acpi_hed_remove,
  72                 .notify = acpi_hed_notify,
  73         },
  74 };
  75 module_acpi_driver(acpi_hed_driver);
  76
  77 ACPI_MODULE_NAME("hed");
  78 MODULE_AUTHOR("Huang Ying");
  79 MODULE_DESCRIPTION("ACPI Hardware Error Device Driver");
  80 MODULE_LICENSE("GPL");