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/*
* poweroff.c - ACPI handler for powering off the system.
*
* AKA S5, but it is independent of whether or not the kernel supports
* any other sleep support in the system.
*
* Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
*
* This file is released under the GPLv2.
*/
#include <linux/pm.h>
#include <linux/init.h>
#include <acpi/acpi_bus.h>
#include <linux/sysdev.h>
#include <asm/io.h>
#include "sleep.h"
int acpi_sleep_prepare(u32 acpi_state)
{
/* do we have a wakeup address for S2 and S3? */
if (acpi_state == ACPI_STATE_S3) {
if (!acpi_wakeup_address) {
return -EFAULT;
}
acpi_set_firmware_waking_vector((acpi_physical_address)
virt_to_phys((void *)
acpi_wakeup_address));
}
ACPI_FLUSH_CPU_CACHE();
acpi_enable_wakeup_device_prep(acpi_state);
acpi_gpe_sleep_prepare(acpi_state);
acpi_enter_sleep_state_prep(acpi_state);
return 0;
}
#ifdef CONFIG_PM
static void acpi_power_off_prepare(void)
{
/* Prepare to power off the system */
acpi_sleep_prepare(ACPI_STATE_S5);
}
static void acpi_power_off(void)
{
/* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
printk("%s called\n", __FUNCTION__);
local_irq_disable();
/* Some SMP machines only can poweroff in boot CPU */
acpi_enter_sleep_state(ACPI_STATE_S5);
}
static int acpi_poweroff_init(void)
{
if (!acpi_disabled) {
u8 type_a, type_b;
acpi_status status;
status =
acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
if (ACPI_SUCCESS(status)) {
pm_power_off_prepare = acpi_power_off_prepare;
pm_power_off = acpi_power_off;
}
}
return 0;
}
late_initcall(acpi_poweroff_init);
#endif /* CONFIG_PM */
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