linux/drivers/acpi/hed.c
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   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 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 acpi_hed_remove(struct acpi_device *device)
  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};
  89module_acpi_driver(acpi_hed_driver);
  90
  91ACPI_MODULE_NAME("hed");
  92MODULE_AUTHOR("Huang Ying");
  93MODULE_DESCRIPTION("ACPI Hardware Error Device Driver");
  94MODULE_LICENSE("GPL");
  95
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