wakeup.c

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/*
 * wakeup.c - support wakeup devices
 * Copyright (C) 2004 Li Shaohua <[email protected]>
 */

#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")


void acpi_enable_wakeup_devices(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
            || sleep_state > (u32) dev->wakeup.sleep_state
            || !(device_may_wakeup(&dev->dev)
                || dev->wakeup.prepare_count))
            continue;

        if (device_may_wakeup(&dev->dev))
            acpi_enable_wakeup_device_power(dev, sleep_state);

        /* The wake-up power should have been enabled already. */
        acpi_set_gpe_wake_mask(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
                ACPI_GPE_ENABLE);
    }
}

void acpi_disable_wakeup_devices(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
            || sleep_state > (u32) dev->wakeup.sleep_state
            || !(device_may_wakeup(&dev->dev)
                || dev->wakeup.prepare_count))
            continue;

        acpi_set_gpe_wake_mask(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
                ACPI_GPE_DISABLE);

        if (device_may_wakeup(&dev->dev))
            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);
        if (device_can_wakeup(&dev->dev)) {
            /* Button GPEs are supposed to be always enabled. */
            acpi_enable_gpe(dev->wakeup.gpe_device,
                    dev->wakeup.gpe_number);
            device_set_wakeup_enable(&dev->dev, true);
        }
    }
    mutex_unlock(&acpi_device_lock);
    return 0;
}