linux/kernel/power/user.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * linux/kernel/power/user.c
 *
 * This file provides the user space interface for software suspend/resume.
 *
 * Copyright (C) 2006 Rafael J. Wysocki <[email protected]>
 */

#include <linux/suspend.h>
#include <linux/reboot.h>
#include <linux/string.h>
#include <linux/device.h>
#include <linux/miscdevice.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/swapops.h>
#include <linux/pm.h>
#include <linux/fs.h>
#include <linux/compat.h>
#include <linux/console.h>
#include <linux/cpu.h>
#include <linux/freezer.h>

#include <linux/uaccess.h>

#include "power.h"

static bool need_wait;

static struct snapshot_data { … } snapshot_state;

int is_hibernate_resume_dev(dev_t dev)
{ … }

static int snapshot_open(struct inode *inode, struct file *filp)
{ … }

static int snapshot_release(struct inode *inode, struct file *filp)
{ … }

static ssize_t snapshot_read(struct file *filp, char __user *buf,
                             size_t count, loff_t *offp)
{ … }

static ssize_t snapshot_write(struct file *filp, const char __user *buf,
                              size_t count, loff_t *offp)
{ … }

struct compat_resume_swap_area { … } __packed;

static int snapshot_set_swap_area(struct snapshot_data *data,
		void __user *argp)
{ … }

static long snapshot_ioctl(struct file *filp, unsigned int cmd,
							unsigned long arg)
{ … }

#ifdef CONFIG_COMPAT
static long
snapshot_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{ … }
#endif /* CONFIG_COMPAT */

static const struct file_operations snapshot_fops = …;

static struct miscdevice snapshot_device = …;

static int __init snapshot_device_init(void)
{
	return misc_register(&snapshot_device);
};

device_initcall(snapshot_device_init);