98 lines
2.3 KiB
C
98 lines
2.3 KiB
C
/*
|
|
* 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/sched.h>
|
|
#include <linux/sysdev.h>
|
|
#include <asm/io.h>
|
|
#include "sleep.h"
|
|
|
|
int acpi_sleep_prepare(u32 acpi_state)
|
|
{
|
|
#ifdef CONFIG_ACPI_SLEEP
|
|
/* do we have a wakeup address for S2 and S3? */
|
|
/* Here, we support only S4BIOS, those we set the wakeup address */
|
|
/* S4OS is only supported for now via swsusp.. */
|
|
if (acpi_state == ACPI_STATE_S3 || acpi_state == ACPI_STATE_S4) {
|
|
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);
|
|
#endif
|
|
if (acpi_state == ACPI_STATE_S5) {
|
|
acpi_wakeup_gpe_poweroff_prepare();
|
|
}
|
|
acpi_enter_sleep_state_prep(acpi_state);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
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_shutdown(struct sys_device *x)
|
|
{
|
|
if (system_state == SYSTEM_POWER_OFF) {
|
|
/* Prepare if we are going to power off the system */
|
|
return acpi_sleep_prepare(ACPI_STATE_S5);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct sysdev_class acpi_sysclass = {
|
|
set_kset_name("acpi"),
|
|
.shutdown = acpi_shutdown
|
|
};
|
|
|
|
static struct sys_device device_acpi = {
|
|
.id = 0,
|
|
.cls = &acpi_sysclass,
|
|
};
|
|
|
|
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)) {
|
|
int error;
|
|
error = sysdev_class_register(&acpi_sysclass);
|
|
if (!error)
|
|
error = sysdev_register(&device_acpi);
|
|
if (!error)
|
|
pm_power_off = acpi_power_off;
|
|
return error;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
late_initcall(acpi_poweroff_init);
|
|
|
|
#endif /* CONFIG_PM */
|