2 * poweroff.c - ACPI handler for powering off the system.
4 * AKA S5, but it is independent of whether or not the kernel supports
5 * any other sleep support in the system.
7 * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
9 * This file is released under the GPLv2.
13 #include <linux/init.h>
14 #include <acpi/acpi_bus.h>
15 #include <linux/sysdev.h>
19 int acpi_sleep_prepare(u32 acpi_state)
21 #ifdef CONFIG_ACPI_SLEEP
22 /* do we have a wakeup address for S2 and S3? */
23 if (acpi_state == ACPI_STATE_S3) {
24 if (!acpi_wakeup_address) {
27 acpi_set_firmware_waking_vector((acpi_physical_address)
29 acpi_wakeup_address));
32 ACPI_FLUSH_CPU_CACHE();
33 acpi_enable_wakeup_device_prep(acpi_state);
35 acpi_gpe_sleep_prepare(acpi_state);
36 acpi_enter_sleep_state_prep(acpi_state);
42 static void acpi_power_off_prepare(void)
44 /* Prepare to power off the system */
45 acpi_sleep_prepare(ACPI_STATE_S5);
48 static void acpi_power_off(void)
50 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
51 printk("%s called\n", __FUNCTION__);
53 /* Some SMP machines only can poweroff in boot CPU */
54 acpi_enter_sleep_state(ACPI_STATE_S5);
57 static int acpi_poweroff_init(void)
64 acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
65 if (ACPI_SUCCESS(status)) {
66 pm_power_off_prepare = acpi_power_off_prepare;
67 pm_power_off = acpi_power_off;
73 late_initcall(acpi_poweroff_init);
75 #endif /* CONFIG_PM */