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 /* do we have a wakeup address for S2 and S3? */
22 if (acpi_state == ACPI_STATE_S3) {
23 if (!acpi_wakeup_address) {
26 acpi_set_firmware_waking_vector((acpi_physical_address)
28 acpi_wakeup_address));
31 ACPI_FLUSH_CPU_CACHE();
32 acpi_enable_wakeup_device_prep(acpi_state);
33 acpi_gpe_sleep_prepare(acpi_state);
34 acpi_enter_sleep_state_prep(acpi_state);
40 static void acpi_power_off_prepare(void)
42 /* Prepare to power off the system */
43 acpi_sleep_prepare(ACPI_STATE_S5);
46 static void acpi_power_off(void)
48 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
49 printk("%s called\n", __FUNCTION__);
51 /* Some SMP machines only can poweroff in boot CPU */
52 acpi_enter_sleep_state(ACPI_STATE_S5);
55 static int acpi_poweroff_init(void)
62 acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
63 if (ACPI_SUCCESS(status)) {
64 pm_power_off_prepare = acpi_power_off_prepare;
65 pm_power_off = acpi_power_off;
71 late_initcall(acpi_poweroff_init);
73 #endif /* CONFIG_PM */