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/*
* wakeup.c - support wakeup devices
* Copyright (C) 2004 Li Shaohua <shaohua.li@intel.com>
*/
#include <linux/init.h>
#include <linux/acpi.h>
#include <acpi/acpi_drivers.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include "internal.h"
#include "sleep.h"
/*
* We didn't lock acpi_device_lock in the file, because it invokes oops in
* suspend/resume and isn't really required as this is called in S-state. At
* that time, there is no device hotplug
**/
#define _COMPONENT ACPI_SYSTEM_COMPONENT
ACPI_MODULE_NAME("wakeup_devices")
/**
* acpi_enable_wakeup_device_prep - Prepare wake-up devices.
* @sleep_state: ACPI system sleep state.
*
* Enable all wake-up devices' power, unless the requested system sleep state is
* too deep.
*/
void acpi_enable_wakeup_device_prep(u8 sleep_state)
{
struct list_head *node, *next;
list_for_each_safe(node, next, &acpi_wakeup_device_list) {
struct acpi_device *dev = container_of(node,
struct acpi_device,
wakeup_list);
if (!dev->wakeup.flags.valid || !dev->wakeup.state.enabled
|| (sleep_state > (u32) dev->wakeup.sleep_state))
continue;
acpi_enable_wakeup_device_power(dev, sleep_state);
}
}
/**
* acpi_enable_wakeup_device - Enable wake-up device GPEs.
* @sleep_state: ACPI system sleep state.
*
* Enable all wake-up devices' GPEs, with the assumption that
* acpi_disable_all_gpes() was executed before, so we don't need to disable any
* GPEs here.
*/
void acpi_enable_wakeup_device(u8 sleep_state)
{
struct list_head *node, *next;
/*
* Caution: this routine must be invoked when interrupt is disabled
* Refer ACPI2.0: P212
*/
list_for_each_safe(node, next, &acpi_wakeup_device_list) {
struct acpi_device *dev =
container_of(node, struct acpi_device, wakeup_list);
if (!dev->wakeup.flags.valid)
continue;
if ((!dev->wakeup.state.enabled && !dev->wakeup.prepare_count)
|| sleep_state > (u32) dev->wakeup.sleep_state)
continue;
/* The wake-up power should have been enabled already. */
acpi_set_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
ACPI_GPE_ENABLE);
}
}
/**
* acpi_disable_wakeup_device - Disable devices' wakeup capability.
* @sleep_state: ACPI system sleep state.
*
* This function only affects devices with wakeup.state.enabled set, which means
* that it reverses the changes made by acpi_enable_wakeup_device_prep().
*/
void acpi_disable_wakeup_device(u8 sleep_state)
{
struct list_head *node, *next;
list_for_each_safe(node, next, &acpi_wakeup_device_list) {
struct acpi_device *dev =
container_of(node, struct acpi_device, wakeup_list);
if (!dev->wakeup.flags.valid || !dev->wakeup.state.enabled
|| (sleep_state > (u32) dev->wakeup.sleep_state))
continue;
acpi_disable_wakeup_device_power(dev);
}
}
int __init acpi_wakeup_device_init(void)
{
struct list_head *node, *next;
mutex_lock(&acpi_device_lock);
list_for_each_safe(node, next, &acpi_wakeup_device_list) {
struct acpi_device *dev = container_of(node,
struct acpi_device,
wakeup_list);
/* In case user doesn't load button driver */
if (!dev->wakeup.flags.always_enabled ||
dev->wakeup.state.enabled)
continue;
acpi_enable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
ACPI_GPE_TYPE_WAKE);
dev->wakeup.state.enabled = 1;
}
mutex_unlock(&acpi_device_lock);
return 0;
}
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