linux-imx

// SPDX-License-Identifier: GPL-2.0+

/*

 *  Pvpanic Device Support

 *

 *  Copyright (C) 2013 Fujitsu.

 *  Copyright (C) 2018 ZTE.

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/acpi.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/of_address.h>

#include <linux/platform_device.h>

#include <linux/types.h>

​

static void __iomem *base;

​

#define PVPANIC_PANICKED        (1 << 0)

​

MODULE_AUTHOR("Hu Tao <hutao@cn.fujitsu.com>");

MODULE_DESCRIPTION("pvpanic device driver");

MODULE_LICENSE("GPL");

​

static void

pvpanic_send_event(unsigned int event)

{

    iowrite8(event, base);

}

​

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 */

};

​

#ifdef CONFIG_ACPI

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);

​

static struct acpi_driver pvpanic_driver = {

    .name =     "pvpanic",

    .class =    "QEMU",

    .ids =      pvpanic_device_ids,

    .ops =      {

                .add =      pvpanic_add,

                .remove =   pvpanic_remove,

            },