1 /*
2  * Power off by restarting and let u-boot keep hold of the machine
3  * until the user presses a button for example.
4  *
5  * Andrew Lunn <andrew@lunn.ch>
6  *
7  * Copyright (C) 2012 Andrew Lunn
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
12  */
13 #include <linux/kernel.h>
14 #include <linux/init.h>
15 #include <linux/platform_device.h>
16 #include <linux/of_platform.h>
17 #include <linux/module.h>
18 #include <asm/system_misc.h>
19 
20 static void restart_poweroff_do_poweroff(void)
21 {
22 	arm_pm_restart('h', NULL);
23 }
24 
25 static int restart_poweroff_probe(struct platform_device *pdev)
26 {
27 	/* If a pm_power_off function has already been added, leave it alone */
28 	if (pm_power_off != NULL) {
29 		dev_err(&pdev->dev,
30 			"pm_power_off function already registered");
31 		return -EBUSY;
32 	}
33 
34 	pm_power_off = &restart_poweroff_do_poweroff;
35 	return 0;
36 }
37 
38 static int restart_poweroff_remove(struct platform_device *pdev)
39 {
40 	if (pm_power_off == &restart_poweroff_do_poweroff)
41 		pm_power_off = NULL;
42 
43 	return 0;
44 }
45 
46 static const struct of_device_id of_restart_poweroff_match[] = {
47 	{ .compatible = "restart-poweroff", },
48 	{},
49 };
50 
51 static struct platform_driver restart_poweroff_driver = {
52 	.probe = restart_poweroff_probe,
53 	.remove = restart_poweroff_remove,
54 	.driver = {
55 		.name = "poweroff-restart",
56 		.owner = THIS_MODULE,
57 		.of_match_table = of_restart_poweroff_match,
58 	},
59 };
60 module_platform_driver(restart_poweroff_driver);
61 
62 MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch");
63 MODULE_DESCRIPTION("restart poweroff driver");
64 MODULE_LICENSE("GPLv2");
65 MODULE_ALIAS("platform:poweroff-restart");
66