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Linux/drivers/power/reset/restart-poweroff.c

  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 #include <asm/system_misc.h>
 20 
 21 static void restart_poweroff_do_poweroff(void)
 22 {
 23         arm_pm_restart(REBOOT_HARD, NULL);
 24 }
 25 
 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 
 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                 .owner = THIS_MODULE,
 58                 .of_match_table = of_restart_poweroff_match,
 59         },
 60 };
 61 module_platform_driver(restart_poweroff_driver);
 62 
 63 MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch");
 64 MODULE_DESCRIPTION("restart poweroff driver");
 65 MODULE_LICENSE("GPL v2");
 66 MODULE_ALIAS("platform:poweroff-restart");
 67 

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