92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
|
/*
|
||
|
|
* drivers/acpi/device_pm.c - ACPI device power management routines.
|
||
|
|
*
|
||
|
|
* Copyright (C) 2012, Intel Corp.
|
||
|
|
* Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
|
||
|
|
*
|
||
|
|
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License version 2 as published
|
||
|
|
* by the Free Software Foundation.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful, but
|
||
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
|
* General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License along
|
||
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
||
|
|
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
|
||
|
|
*
|
||
|
|
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/device.h>
|
||
|
|
#include <linux/mutex.h>
|
||
|
|
|
||
|
|
#include <acpi/acpi.h>
|
||
|
|
#include <acpi/acpi_bus.h>
|
||
|
|
|
||
|
|
static DEFINE_MUTEX(acpi_pm_notifier_lock);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* acpi_add_pm_notifier - Register PM notifier for given ACPI device.
|
||
|
|
* @adev: ACPI device to add the notifier for.
|
||
|
|
* @context: Context information to pass to the notifier routine.
|
||
|
|
*
|
||
|
|
* NOTE: @adev need not be a run-wake or wakeup device to be a valid source of
|
||
|
|
* PM wakeup events. For example, wakeup events may be generated for bridges
|
||
|
|
* if one of the devices below the bridge is signaling wakeup, even if the
|
||
|
|
* bridge itself doesn't have a wakeup GPE associated with it.
|
||
|
|
*/
|
||
|
|
acpi_status acpi_add_pm_notifier(struct acpi_device *adev,
|
||
|
|
acpi_notify_handler handler, void *context)
|
||
|
|
{
|
||
|
|
acpi_status status = AE_ALREADY_EXISTS;
|
||
|
|
|
||
|
|
mutex_lock(&acpi_pm_notifier_lock);
|
||
|
|
|
||
|
|
if (adev->wakeup.flags.notifier_present)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
status = acpi_install_notify_handler(adev->handle,
|
||
|
|
ACPI_SYSTEM_NOTIFY,
|
||
|
|
handler, context);
|
||
|
|
if (ACPI_FAILURE(status))
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
adev->wakeup.flags.notifier_present = true;
|
||
|
|
|
||
|
|
out:
|
||
|
|
mutex_unlock(&acpi_pm_notifier_lock);
|
||
|
|
return status;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device.
|
||
|
|
* @adev: ACPI device to remove the notifier from.
|
||
|
|
*/
|
||
|
|
acpi_status acpi_remove_pm_notifier(struct acpi_device *adev,
|
||
|
|
acpi_notify_handler handler)
|
||
|
|
{
|
||
|
|
acpi_status status = AE_BAD_PARAMETER;
|
||
|
|
|
||
|
|
mutex_lock(&acpi_pm_notifier_lock);
|
||
|
|
|
||
|
|
if (!adev->wakeup.flags.notifier_present)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
status = acpi_remove_notify_handler(adev->handle,
|
||
|
|
ACPI_SYSTEM_NOTIFY,
|
||
|
|
handler);
|
||
|
|
if (ACPI_FAILURE(status))
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
adev->wakeup.flags.notifier_present = false;
|
||
|
|
|
||
|
|
out:
|
||
|
|
mutex_unlock(&acpi_pm_notifier_lock);
|
||
|
|
return status;
|
||
|
|
}
|