hed.c

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/*
 * ACPI Hardware Error Device (PNP0C33) Driver
 *
 * Copyright (C) 2010, Intel Corp.
 *  Author: Huang Ying <[email protected]>
 *
 * ACPI Hardware Error Device is used to report some hardware errors
 * notified via SCI, mainly the corrected errors.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include <acpi/hed.h>

static struct acpi_device_id acpi_hed_ids[] = {
    {"PNP0C33", 0},
    {"", 0},
};
MODULE_DEVICE_TABLE(acpi, acpi_hed_ids);

static acpi_handle hed_handle;

static BLOCKING_NOTIFIER_HEAD(acpi_hed_notify_list);

int register_acpi_hed_notifier(struct notifier_block *nb)
{
    return blocking_notifier_chain_register(&acpi_hed_notify_list, nb);
}
EXPORT_SYMBOL_GPL(register_acpi_hed_notifier);

void unregister_acpi_hed_notifier(struct notifier_block *nb)
{
    blocking_notifier_chain_unregister(&acpi_hed_notify_list, nb);
}
EXPORT_SYMBOL_GPL(unregister_acpi_hed_notifier);

/*
 * SCI to report hardware error is forwarded to the listeners of HED,
 * it is used by HEST Generic Hardware Error Source with notify type
 * SCI.
 */
static void acpi_hed_notify(struct acpi_device *device, u32 event)
{
    blocking_notifier_call_chain(&acpi_hed_notify_list, 0, NULL);
}

static int __devinit acpi_hed_add(struct acpi_device *device)
{
    /* Only one hardware error device */
    if (hed_handle)
        return -EINVAL;
    hed_handle = device->handle;
    return 0;
}

static int __devexit acpi_hed_remove(struct acpi_device *device, int type)
{
    hed_handle = NULL;
    return 0;
}

static struct acpi_driver acpi_hed_driver = {
    .name = "hardware_error_device",
    .class = "hardware_error",
    .ids = acpi_hed_ids,
    .ops = {
        .add = acpi_hed_add,
        .remove = acpi_hed_remove,
        .notify = acpi_hed_notify,
    },
};
module_acpi_driver(acpi_hed_driver);

ACPI_MODULE_NAME("hed");
MODULE_AUTHOR("Huang Ying");
MODULE_DESCRIPTION("ACPI Hardware Error Device Driver");
MODULE_LICENSE("GPL");