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 <linux/reboot.h>
19
restart_poweroff_do_poweroff(void)20 static void restart_poweroff_do_poweroff(void)
21 {
22 reboot_mode = REBOOT_HARD;
23 machine_restart(NULL);
24 }
25
restart_poweroff_probe(struct platform_device * pdev)26 static int restart_poweroff_probe(struct platform_device *pdev)
27 {
28 /* If a pm_power_off function has already been added, leave it alone */
29 if (pm_power_off != NULL) {
30 dev_err(&pdev->dev,
31 "pm_power_off function already registered");
32 return -EBUSY;
33 }
34
35 pm_power_off = &restart_poweroff_do_poweroff;
36 return 0;
37 }
38
restart_poweroff_remove(struct platform_device * pdev)39 static int restart_poweroff_remove(struct platform_device *pdev)
40 {
41 if (pm_power_off == &restart_poweroff_do_poweroff)
42 pm_power_off = NULL;
43
44 return 0;
45 }
46
47 static const struct of_device_id of_restart_poweroff_match[] = {
48 { .compatible = "restart-poweroff", },
49 {},
50 };
51
52 static struct platform_driver restart_poweroff_driver = {
53 .probe = restart_poweroff_probe,
54 .remove = restart_poweroff_remove,
55 .driver = {
56 .name = "poweroff-restart",
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("GPL v2");
65 MODULE_ALIAS("platform:poweroff-restart");
66
