1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Power off by restarting and let u-boot keep hold of the machine 4 * until the user presses a button for example. 5 * 6 * Andrew Lunn <andrew@lunn.ch> 7 * 8 * Copyright (C) 2012 Andrew Lunn 9 */ 10 #include <linux/kernel.h> 11 #include <linux/init.h> 12 #include <linux/platform_device.h> 13 #include <linux/of_platform.h> 14 #include <linux/module.h> 15 #include <linux/reboot.h> 16 17 static void restart_poweroff_do_poweroff(void) 18 { 19 reboot_mode = REBOOT_HARD; 20 machine_restart(NULL); 21 } 22 23 static int restart_poweroff_probe(struct platform_device *pdev) 24 { 25 /* If a pm_power_off function has already been added, leave it alone */ 26 if (pm_power_off != NULL) { 27 dev_err(&pdev->dev, 28 "pm_power_off function already registered"); 29 return -EBUSY; 30 } 31 32 pm_power_off = &restart_poweroff_do_poweroff; 33 return 0; 34 } 35 36 static void restart_poweroff_remove(struct platform_device *pdev) 37 { 38 if (pm_power_off == &restart_poweroff_do_poweroff) 39 pm_power_off = NULL; 40 } 41 42 static const struct of_device_id of_restart_poweroff_match[] = { 43 { .compatible = "restart-poweroff", }, 44 {}, 45 }; 46 MODULE_DEVICE_TABLE(of, of_restart_poweroff_match); 47 48 static struct platform_driver restart_poweroff_driver = { 49 .probe = restart_poweroff_probe, 50 .remove_new = restart_poweroff_remove, 51 .driver = { 52 .name = "poweroff-restart", 53 .of_match_table = of_restart_poweroff_match, 54 }, 55 }; 56 module_platform_driver(restart_poweroff_driver); 57 58 MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch"); 59 MODULE_DESCRIPTION("restart poweroff driver"); 60 MODULE_ALIAS("platform:poweroff-restart"); 61