125 строки
2.8 KiB
C
125 строки
2.8 KiB
C
/*
|
|
* pvpanic.c - pvpanic Device Support
|
|
*
|
|
* Copyright (C) 2013 Fujitsu.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/types.h>
|
|
#include <linux/acpi.h>
|
|
|
|
MODULE_AUTHOR("Hu Tao <hutao@cn.fujitsu.com>");
|
|
MODULE_DESCRIPTION("pvpanic device driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static int pvpanic_add(struct acpi_device *device);
|
|
static int pvpanic_remove(struct acpi_device *device);
|
|
|
|
static const struct acpi_device_id pvpanic_device_ids[] = {
|
|
{ "QEMU0001", 0 },
|
|
{ "", 0 },
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, pvpanic_device_ids);
|
|
|
|
#define PVPANIC_PANICKED (1 << 0)
|
|
|
|
static u16 port;
|
|
|
|
static struct acpi_driver pvpanic_driver = {
|
|
.name = "pvpanic",
|
|
.class = "QEMU",
|
|
.ids = pvpanic_device_ids,
|
|
.ops = {
|
|
.add = pvpanic_add,
|
|
.remove = pvpanic_remove,
|
|
},
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static void
|
|
pvpanic_send_event(unsigned int event)
|
|
{
|
|
outb(event, port);
|
|
}
|
|
|
|
static int
|
|
pvpanic_panic_notify(struct notifier_block *nb, unsigned long code,
|
|
void *unused)
|
|
{
|
|
pvpanic_send_event(PVPANIC_PANICKED);
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block pvpanic_panic_nb = {
|
|
.notifier_call = pvpanic_panic_notify,
|
|
.priority = 1, /* let this called before broken drm_fb_helper */
|
|
};
|
|
|
|
|
|
static acpi_status
|
|
pvpanic_walk_resources(struct acpi_resource *res, void *context)
|
|
{
|
|
switch (res->type) {
|
|
case ACPI_RESOURCE_TYPE_END_TAG:
|
|
return AE_OK;
|
|
|
|
case ACPI_RESOURCE_TYPE_IO:
|
|
port = res->data.io.minimum;
|
|
return AE_OK;
|
|
|
|
default:
|
|
return AE_ERROR;
|
|
}
|
|
}
|
|
|
|
static int pvpanic_add(struct acpi_device *device)
|
|
{
|
|
int ret;
|
|
|
|
ret = acpi_bus_get_status(device);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (!device->status.enabled || !device->status.functional)
|
|
return -ENODEV;
|
|
|
|
acpi_walk_resources(device->handle, METHOD_NAME__CRS,
|
|
pvpanic_walk_resources, NULL);
|
|
|
|
if (!port)
|
|
return -ENODEV;
|
|
|
|
atomic_notifier_chain_register(&panic_notifier_list,
|
|
&pvpanic_panic_nb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pvpanic_remove(struct acpi_device *device)
|
|
{
|
|
|
|
atomic_notifier_chain_unregister(&panic_notifier_list,
|
|
&pvpanic_panic_nb);
|
|
return 0;
|
|
}
|
|
|
|
module_acpi_driver(pvpanic_driver);
|