99 lines
2.3 KiB
C
99 lines
2.3 KiB
C
/*
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* poweroff.c - ACPI handler for powering off the system.
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*
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* AKA S5, but it is independent of whether or not the kernel supports
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* any other sleep support in the system.
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*
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* Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
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*
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* This file is released under the GPLv2.
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*/
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#include <linux/pm.h>
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#include <linux/init.h>
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#include <acpi/acpi_bus.h>
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#include <linux/sched.h>
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#include <linux/sysdev.h>
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#include <asm/io.h>
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#include "sleep.h"
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int acpi_sleep_prepare(u32 acpi_state)
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{
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#ifdef CONFIG_ACPI_SLEEP
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/* do we have a wakeup address for S2 and S3? */
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/* Here, we support only S4BIOS, those we set the wakeup address */
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/* S4OS is only supported for now via swsusp.. */
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if (acpi_state == ACPI_STATE_S3 || acpi_state == ACPI_STATE_S4) {
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if (!acpi_wakeup_address) {
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return -EFAULT;
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}
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acpi_set_firmware_waking_vector((acpi_physical_address)
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virt_to_phys((void *)
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acpi_wakeup_address));
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}
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ACPI_FLUSH_CPU_CACHE();
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acpi_enable_wakeup_device_prep(acpi_state);
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#endif
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if (acpi_state == ACPI_STATE_S5) {
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acpi_wakeup_gpe_poweroff_prepare();
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}
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acpi_enter_sleep_state_prep(acpi_state);
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return 0;
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}
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#ifdef CONFIG_PM
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void acpi_power_off(void)
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{
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/* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
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printk("%s called\n", __FUNCTION__);
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local_irq_disable();
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/* Some SMP machines only can poweroff in boot CPU */
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acpi_enter_sleep_state(ACPI_STATE_S5);
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}
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static int acpi_shutdown(struct sys_device *x)
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{
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if (system_state == SYSTEM_POWER_OFF) {
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/* Prepare if we are going to power off the system */
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return acpi_sleep_prepare(ACPI_STATE_S5);
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}
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return 0;
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}
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static struct sysdev_class acpi_sysclass = {
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set_kset_name("acpi"),
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.shutdown = acpi_shutdown
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};
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static struct sys_device device_acpi = {
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.id = 0,
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.cls = &acpi_sysclass,
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};
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static int acpi_poweroff_init(void)
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{
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if (!acpi_disabled) {
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u8 type_a, type_b;
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acpi_status status;
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status =
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acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
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if (ACPI_SUCCESS(status)) {
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int error;
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error = sysdev_class_register(&acpi_sysclass);
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if (!error)
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error = sysdev_register(&device_acpi);
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if (!error)
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pm_power_off = acpi_power_off;
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return error;
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}
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}
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return 0;
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}
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late_initcall(acpi_poweroff_init);
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#endif /* CONFIG_PM */
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