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