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// SPDX-License-Identifier: GPL-2.0-only
/*
* ACPI Hardware Error Device (PNP0C33) Driver
*
* Copyright (C) 2010, Intel Corp.
* Author: Huang Ying <ying.huang@intel.com>
*
* ACPI Hardware Error Device is used to report some hardware errors
* notified via SCI, mainly the corrected errors.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include <acpi/hed.h>
static const 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(acpi_handle handle, u32 event, void *data)
{
blocking_notifier_call_chain(&acpi_hed_notify_list, 0, NULL);
}
static int acpi_hed_add(struct acpi_device *device)
{
int err;
/* Only one hardware error device */
if (hed_handle)
return -EINVAL;
hed_handle = device->handle;
err = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY,
acpi_hed_notify, device);
if (err)
hed_handle = NULL;
return err;
}
static void acpi_hed_remove(struct acpi_device *device)
{
acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY,
acpi_hed_notify);
hed_handle = NULL;
}
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,
},
};
module_acpi_driver(acpi_hed_driver);
MODULE_AUTHOR("Huang Ying");
MODULE_DESCRIPTION("ACPI Hardware Error Device Driver");
MODULE_LICENSE("GPL");
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