123 lines
3.3 KiB
C
123 lines
3.3 KiB
C
/*
|
|
* 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;
|
|
}
|