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/sched.h>
16 #include <linux/sysdev.h>
20 int acpi_sleep_prepare(u32 acpi_state)
22 /* Flag to do not allow second time invocation for S5 state */
23 static int shutdown_prepared = 0;
24 #ifdef CONFIG_ACPI_SLEEP
25 /* do we have a wakeup address for S2 and S3? */
26 /* Here, we support only S4BIOS, those we set the wakeup address */
27 /* S4OS is only supported for now via swsusp.. */
28 if (acpi_state == ACPI_STATE_S3 || acpi_state == ACPI_STATE_S4) {
29 if (!acpi_wakeup_address) {
32 acpi_set_firmware_waking_vector((acpi_physical_address)
34 acpi_wakeup_address));
37 ACPI_FLUSH_CPU_CACHE();
38 acpi_enable_wakeup_device_prep(acpi_state);
40 if (acpi_state == ACPI_STATE_S5) {
41 /* Check if we were already called */
42 if (shutdown_prepared)
44 acpi_wakeup_gpe_poweroff_prepare();
45 shutdown_prepared = 1;
47 acpi_enter_sleep_state_prep(acpi_state);
51 void acpi_power_off(void)
53 printk("%s called\n", __FUNCTION__);
54 acpi_sleep_prepare(ACPI_STATE_S5);
56 /* Some SMP machines only can poweroff in boot CPU */
57 set_cpus_allowed(current, cpumask_of_cpu(0));
58 acpi_enter_sleep_state(ACPI_STATE_S5);
63 static int acpi_shutdown(struct sys_device *x)
65 return acpi_sleep_prepare(ACPI_STATE_S5);
68 static struct sysdev_class acpi_sysclass = {
69 set_kset_name("acpi"),
70 .shutdown = acpi_shutdown
73 static struct sys_device device_acpi = {
75 .cls = &acpi_sysclass,
80 static int acpi_poweroff_init(void)
87 acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
88 if (ACPI_SUCCESS(status)) {
89 pm_power_off = acpi_power_off;
93 error = sysdev_class_register(&acpi_sysclass);
95 error = sysdev_register(&device_acpi);
104 late_initcall(acpi_poweroff_init);