drivers/power/reset/restart-poweroff.c

   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 <[email protected]>
   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 int restart_poweroff_do_poweroff(struct sys_off_data *data)
  18 {
  19         reboot_mode = REBOOT_HARD;
  20         machine_restart(NULL);
  21         return NOTIFY_DONE;
  22 }
  23
  24 static int restart_poweroff_probe(struct platform_device *pdev)
  25 {
  26         /* Set this handler to low priority to not override an existing handler */
  27         return devm_register_sys_off_handler(&pdev->dev,
  28                                              SYS_OFF_MODE_POWER_OFF,
  29                                              SYS_OFF_PRIO_LOW,
  30                                              restart_poweroff_do_poweroff,
  31                                              NULL);
  32 }
  33
  34 static const struct of_device_id of_restart_poweroff_match[] = {
  35         { .compatible = "restart-poweroff", },
  36         {},
  37 };
  38 MODULE_DEVICE_TABLE(of, of_restart_poweroff_match);
  39
  40 static struct platform_driver restart_poweroff_driver = {
  41         .probe = restart_poweroff_probe,
  42         .driver = {
  43                 .name = "poweroff-restart",
  44                 .of_match_table = of_restart_poweroff_match,
  45         },
  46 };
  47 module_platform_driver(restart_poweroff_driver);
  48
  49 MODULE_AUTHOR("Andrew Lunn <[email protected]");
  50 MODULE_DESCRIPTION("restart poweroff driver");
  51 MODULE_ALIAS("platform:poweroff-restart");