| Andrew Lunn | ffd8f9a | 2012-12-28 13:25:11 +0100 | [diff] [blame^] | 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 __devinit 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 __devexit 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 = __devexit_p(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"); |