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/******************************************************************************

 *

 * Module Name: evxface - External interfaces for ACPI events

 *

 *****************************************************************************/

/******************************************************************************

 *

 * 1. Copyright Notice

 *

 * Some or all of this work - Copyright (c) 1999 - 2011, Intel Corp.

 * All rights reserved.

 *

 * 2. License

 *

 * 2.1. This is your license from Intel Corp. under its intellectual property

 * rights.  You may have additional license terms from the party that provided

 * you this software, covering your right to use that party's intellectual

 * property rights.

 *

 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a

 * copy of the source code appearing in this file ("Covered Code") an

 * irrevocable, perpetual, worldwide license under Intel's copyrights in the

 * base code distributed originally by Intel ("Original Intel Code") to copy,

 * make derivatives, distribute, use and display any portion of the Covered

 * Code in any form, with the right to sublicense such rights; and

 *

 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent

 * license (with the right to sublicense), under only those claims of Intel

 * patents that are infringed by the Original Intel Code, to make, use, sell,

 * offer to sell, and import the Covered Code and derivative works thereof

 * solely to the minimum extent necessary to exercise the above copyright

 * license, and in no event shall the patent license extend to any additions

 * to or modifications of the Original Intel Code.  No other license or right

 * is granted directly or by implication, estoppel or otherwise;

 *

 * The above copyright and patent license is granted only if the following

 * conditions are met:

 *

 * 3. Conditions

 *

 * 3.1. Redistribution of Source with Rights to Further Distribute Source.

 * Redistribution of source code of any substantial portion of the Covered

 * Code or modification with rights to further distribute source must include

 * the above Copyright Notice, the above License, this list of Conditions,

 * and the following Disclaimer and Export Compliance provision.  In addition,

 * Licensee must cause all Covered Code to which Licensee contributes to

 * contain a file documenting the changes Licensee made to create that Covered

 * Code and the date of any change.  Licensee must include in that file the

 * documentation of any changes made by any predecessor Licensee.  Licensee

 * must include a prominent statement that the modification is derived,

 * directly or indirectly, from Original Intel Code.

 *

 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.

 * Redistribution of source code of any substantial portion of the Covered

 * Code or modification without rights to further distribute source must

 * include the following Disclaimer and Export Compliance provision in the

 * documentation and/or other materials provided with distribution.  In

 * addition, Licensee may not authorize further sublicense of source of any

 * portion of the Covered Code, and must include terms to the effect that the

 * license from Licensee to its licensee is limited to the intellectual

 * property embodied in the software Licensee provides to its licensee, and

 * not to intellectual property embodied in modifications its licensee may

 * make.

 *

 * 3.3. Redistribution of Executable. Redistribution in executable form of any

 * substantial portion of the Covered Code or modification must reproduce the

 * above Copyright Notice, and the following Disclaimer and Export Compliance

 * provision in the documentation and/or other materials provided with the

 * distribution.

 *

 * 3.4. Intel retains all right, title, and interest in and to the Original

 * Intel Code.

 *

 * 3.5. Neither the name Intel nor any other trademark owned or controlled by

 * Intel shall be used in advertising or otherwise to promote the sale, use or

 * other dealings in products derived from or relating to the Covered Code

 * without prior written authorization from Intel.

 *

 * 4. Disclaimer and Export Compliance

 *

 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED

 * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE

 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,

 * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY

 * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY

 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A

 * PARTICULAR PURPOSE.

 *

 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES

 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR

 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,

 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY

 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL

 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS

 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY

 * LIMITED REMEDY.

 *

 * 4.3. Licensee shall not export, either directly or indirectly, any of this

 * software or system incorporating such software without first obtaining any

 * required license or other approval from the U. S. Department of Commerce or

 * any other agency or department of the United States Government.  In the

 * event Licensee exports any such software from the United States or

 * re-exports any such software from a foreign destination, Licensee shall

 * ensure that the distribution and export/re-export of the software is in

 * compliance with all laws, regulations, orders, or other restrictions of the

 * U.S. Export Administration Regulations. Licensee agrees that neither it nor

 * any of its subsidiaries will export/re-export any technical data, process,

 * software, or service, directly or indirectly, to any country for which the

 * United States government or any agency thereof requires an export license,

 * other governmental approval, or letter of assurance, without first obtaining

 * such license, approval or letter.

 *

 *****************************************************************************/

#define __EVXFACE_C__

#include "acpi.h"

#include "accommon.h"

#include "acnamesp.h"

#include "acevents.h"

#include "acinterp.h"

#define _COMPONENT          ACPI_EVENTS

        ACPI_MODULE_NAME    ("evxface")

/*******************************************************************************

 *

 * FUNCTION:    AcpiInstallExceptionHandler

 *

 * PARAMETERS:  Handler         - Pointer to the handler function for the

 *                                event

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Saves the pointer to the handler function

 *

 ******************************************************************************/

ACPI_STATUS

AcpiInstallExceptionHandler (

    ACPI_EXCEPTION_HANDLER  Handler)

{

    ACPI_STATUS             Status;

    ACPI_FUNCTION_TRACE (AcpiInstallExceptionHandler);

    Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);

    if (ACPI_FAILURE (Status))

    {

        return_ACPI_STATUS (Status);

    }

    /* Don't allow two handlers. */

    if (AcpiGbl_ExceptionHandler)

    {

        Status = AE_ALREADY_EXISTS;

        goto Cleanup;

    }

    /* Install the handler */

    AcpiGbl_ExceptionHandler = Handler;

Cleanup:

    (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);

    return_ACPI_STATUS (Status);

}

ACPI_EXPORT_SYMBOL (AcpiInstallExceptionHandler)

/*******************************************************************************

 *

 * FUNCTION:    AcpiInstallGlobalEventHandler

 *

 * PARAMETERS:  Handler         - Pointer to the global event handler function

 *              Context         - Value passed to the handler on each event

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Saves the pointer to the handler function. The global handler

 *              is invoked upon each incoming GPE and Fixed Event. It is

 *              invoked at interrupt level at the time of the event dispatch.

 *              Can be used to update event counters, etc.

 *

 ******************************************************************************/

ACPI_STATUS

AcpiInstallGlobalEventHandler (

    ACPI_GBL_EVENT_HANDLER  Handler,

    void                    *Context)

{

    ACPI_STATUS             Status;

    ACPI_FUNCTION_TRACE (AcpiInstallGlobalEventHandler);

    /* Parameter validation */

    if (!Handler)

    {

        return_ACPI_STATUS (AE_BAD_PARAMETER);

    }

    Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);

    if (ACPI_FAILURE (Status))

    {

        return_ACPI_STATUS (Status);

    }

    /* Don't allow two handlers. */

    if (AcpiGbl_GlobalEventHandler)

    {

        Status = AE_ALREADY_EXISTS;

        goto Cleanup;

    }

    AcpiGbl_GlobalEventHandler = Handler;

    AcpiGbl_GlobalEventHandlerContext = Context;

Cleanup:

    (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);

    return_ACPI_STATUS (Status);

}

ACPI_EXPORT_SYMBOL (AcpiInstallGlobalEventHandler)

/*******************************************************************************

 *

 * FUNCTION:    AcpiInstallFixedEventHandler

 *

 * PARAMETERS:  Event           - Event type to enable.

 *              Handler         - Pointer to the handler function for the

 *                                event

 *              Context         - Value passed to the handler on each GPE

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Saves the pointer to the handler function and then enables the

 *              event.

 *

 ******************************************************************************/

ACPI_STATUS

AcpiInstallFixedEventHandler (

    UINT32                  Event,

    ACPI_EVENT_HANDLER      Handler,

    void                    *Context)

{

    ACPI_STATUS             Status;

    ACPI_FUNCTION_TRACE (AcpiInstallFixedEventHandler);

    /* Parameter validation */

    if (Event > ACPI_EVENT_MAX)

    {

        return_ACPI_STATUS (AE_BAD_PARAMETER);

    }

    Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);

    if (ACPI_FAILURE (Status))

    {

        return_ACPI_STATUS (Status);

    }

    /* Don't allow two handlers. */

    if (NULL != AcpiGbl_FixedEventHandlers[Event].Handler)

    {

        Status = AE_ALREADY_EXISTS;

        goto Cleanup;

    }

    /* Install the handler before enabling the event */

    AcpiGbl_FixedEventHandlers[Event].Handler = Handler;

    AcpiGbl_FixedEventHandlers[Event].Context = Context;

    Status = AcpiEnableEvent (Event, 0);

    if (ACPI_FAILURE (Status))

    {

        ACPI_WARNING ((AE_INFO, "Could not enable fixed event 0x%X", Event));

        /* Remove the handler */

        AcpiGbl_FixedEventHandlers[Event].Handler = NULL;

        AcpiGbl_FixedEventHandlers[Event].Context = NULL;

    }

    else

    {

        ACPI_DEBUG_PRINT ((ACPI_DB_INFO,

            "Enabled fixed event %X, Handler=%p\n", Event, Handler));

    }

Cleanup:

    (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);

    return_ACPI_STATUS (Status);

}

ACPI_EXPORT_SYMBOL (AcpiInstallFixedEventHandler)

/*******************************************************************************

 *

 * FUNCTION:    AcpiRemoveFixedEventHandler

 *

 * PARAMETERS:  Event           - Event type to disable.

 *              Handler         - Address of the handler

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Disables the event and unregisters the event handler.

 *

 ******************************************************************************/

ACPI_STATUS

AcpiRemoveFixedEventHandler (

    UINT32                  Event,

    ACPI_EVENT_HANDLER      Handler)

{

    ACPI_STATUS             Status = AE_OK;

    ACPI_FUNCTION_TRACE (AcpiRemoveFixedEventHandler);

    /* Parameter validation */

    if (Event > ACPI_EVENT_MAX)

    {

        return_ACPI_STATUS (AE_BAD_PARAMETER);

    }

    Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);

    if (ACPI_FAILURE (Status))

    {

        return_ACPI_STATUS (Status);

    }

    /* Disable the event before removing the handler */

    Status = AcpiDisableEvent (Event, 0);

    /* Always Remove the handler */

    AcpiGbl_FixedEventHandlers[Event].Handler = NULL;

    AcpiGbl_FixedEventHandlers[Event].Context = NULL;

    if (ACPI_FAILURE (Status))

    {

        ACPI_WARNING ((AE_INFO,

            "Could not write to fixed event enable register 0x%X", Event));

    }

    else

    {

        ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Disabled fixed event %X\n", Event));

    }

    (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);

    return_ACPI_STATUS (Status);

}

ACPI_EXPORT_SYMBOL (AcpiRemoveFixedEventHandler)

/*******************************************************************************

 *

 * FUNCTION:    AcpiInstallNotifyHandler

 *

 * PARAMETERS:  Device          - The device for which notifies will be handled

 *              HandlerType     - The type of handler:

 *                                  ACPI_SYSTEM_NOTIFY: SystemHandler (00-7f)

 *                                  ACPI_DEVICE_NOTIFY: DriverHandler (80-ff)

 *                                  ACPI_ALL_NOTIFY:  both system and device

 *              Handler         - Address of the handler

 *              Context         - Value passed to the handler on each GPE

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Install a handler for notifies on an ACPI device

 *

 ******************************************************************************/

ACPI_STATUS

AcpiInstallNotifyHandler (

    ACPI_HANDLE             Device,

    UINT32                  HandlerType,

    ACPI_NOTIFY_HANDLER     Handler,

    void                    *Context)

{

    ACPI_OPERAND_OBJECT     *ObjDesc;

    ACPI_OPERAND_OBJECT     *NotifyObj;

    ACPI_NAMESPACE_NODE     *Node;

    ACPI_STATUS             Status;

    ACPI_FUNCTION_TRACE (AcpiInstallNotifyHandler);

    /* Parameter validation */

    if ((!Device)  ||

        (!Handler) ||

        (HandlerType > ACPI_MAX_NOTIFY_HANDLER_TYPE))

    {

        return_ACPI_STATUS (AE_BAD_PARAMETER);

    }

    Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);

    if (ACPI_FAILURE (Status))

    {

        return_ACPI_STATUS (Status);

    }

    /* Convert and validate the device handle */

    Node = AcpiNsValidateHandle (Device);

    if (!Node)

    {

        Status = AE_BAD_PARAMETER;

        goto UnlockAndExit;

    }

    /*

     * Root Object:

     * Registering a notify handler on the root object indicates that the

     * caller wishes to receive notifications for all objects. Note that

     * only one  global handler can be regsitered (per notify type).

     */

    if (Device == ACPI_ROOT_OBJECT)

    {

        /* Make sure the handler is not already installed */

        if (((HandlerType & ACPI_SYSTEM_NOTIFY) &&

                AcpiGbl_SystemNotify.Handler)       ||

            ((HandlerType & ACPI_DEVICE_NOTIFY) &&

                AcpiGbl_DeviceNotify.Handler))

        {

            Status = AE_ALREADY_EXISTS;

            goto UnlockAndExit;

        }

        if (HandlerType & ACPI_SYSTEM_NOTIFY)

        {

            AcpiGbl_SystemNotify.Node    = Node;

            AcpiGbl_SystemNotify.Handler = Handler;

            AcpiGbl_SystemNotify.Context = Context;

        }

        if (HandlerType & ACPI_DEVICE_NOTIFY)

        {

            AcpiGbl_DeviceNotify.Node    = Node;

            AcpiGbl_DeviceNotify.Handler = Handler;

            AcpiGbl_DeviceNotify.Context = Context;

        }

        /* Global notify handler installed */

    }

    /*

     * All Other Objects:

     * Caller will only receive notifications specific to the target object.

     * Note that only certain object types can receive notifications.

     */

    else

    {

        /* Notifies allowed on this object? */

        if (!AcpiEvIsNotifyObject (Node))

        {

            Status = AE_TYPE;

            goto UnlockAndExit;

        }

        /* Check for an existing internal object */

        ObjDesc = AcpiNsGetAttachedObject (Node);

        if (ObjDesc)

        {

            /* Object exists - make sure there's no handler */

            if (((HandlerType & ACPI_SYSTEM_NOTIFY) &&

                    ObjDesc->CommonNotify.SystemNotify)   ||

                ((HandlerType & ACPI_DEVICE_NOTIFY) &&

                    ObjDesc->CommonNotify.DeviceNotify))

            {

                Status = AE_ALREADY_EXISTS;

                goto UnlockAndExit;

            }

        }

        else

        {

            /* Create a new object */

            ObjDesc = AcpiUtCreateInternalObject (Node->Type);

            if (!ObjDesc)

            {

                Status = AE_NO_MEMORY;

                goto UnlockAndExit;

            }

            /* Attach new object to the Node */

            Status = AcpiNsAttachObject (Device, ObjDesc, Node->Type);

            /* Remove local reference to the object */

            AcpiUtRemoveReference (ObjDesc);

            if (ACPI_FAILURE (Status))

            {

                goto UnlockAndExit;

            }

        }

        /* Install the handler */

        NotifyObj = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_NOTIFY);

        if (!NotifyObj)

        {

            Status = AE_NO_MEMORY;

            goto UnlockAndExit;

        }

        NotifyObj->Notify.Node    = Node;

        NotifyObj->Notify.Handler = Handler;

        NotifyObj->Notify.Context = Context;

        if (HandlerType & ACPI_SYSTEM_NOTIFY)

        {

            ObjDesc->CommonNotify.SystemNotify = NotifyObj;

        }

        if (HandlerType & ACPI_DEVICE_NOTIFY)

        {

            ObjDesc->CommonNotify.DeviceNotify = NotifyObj;

        }

        if (HandlerType == ACPI_ALL_NOTIFY)

        {

            /* Extra ref if installed in both */

            AcpiUtAddReference (NotifyObj);

        }

    }

UnlockAndExit:

    (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);

    return_ACPI_STATUS (Status);

}

ACPI_EXPORT_SYMBOL (AcpiInstallNotifyHandler)

/*******************************************************************************

 *

 * FUNCTION:    AcpiRemoveNotifyHandler

 *

 * PARAMETERS:  Device          - The device for which notifies will be handled

 *              HandlerType     - The type of handler:

 *                                  ACPI_SYSTEM_NOTIFY: SystemHandler (00-7f)

 *                                  ACPI_DEVICE_NOTIFY: DriverHandler (80-ff)

 *                                  ACPI_ALL_NOTIFY:  both system and device

 *              Handler         - Address of the handler

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Remove a handler for notifies on an ACPI device

 *

 ******************************************************************************/

ACPI_STATUS

AcpiRemoveNotifyHandler (

    ACPI_HANDLE             Device,

    UINT32                  HandlerType,

    ACPI_NOTIFY_HANDLER     Handler)

{

    ACPI_OPERAND_OBJECT     *NotifyObj;

    ACPI_OPERAND_OBJECT     *ObjDesc;

    ACPI_NAMESPACE_NODE     *Node;

    ACPI_STATUS             Status;

    ACPI_FUNCTION_TRACE (AcpiRemoveNotifyHandler);

    /* Parameter validation */

    if ((!Device)  ||

        (!Handler) ||

        (HandlerType > ACPI_MAX_NOTIFY_HANDLER_TYPE))

    {

        return_ACPI_STATUS (AE_BAD_PARAMETER);

    }

    Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);

    if (ACPI_FAILURE (Status))

    {

        return_ACPI_STATUS (Status);

    }

    /* Convert and validate the device handle */

    Node = AcpiNsValidateHandle (Device);

    if (!Node)

    {

        Status = AE_BAD_PARAMETER;

        goto UnlockAndExit;

    }

    /* Root Object */

    if (Device == ACPI_ROOT_OBJECT)

    {

        ACPI_DEBUG_PRINT ((ACPI_DB_INFO,

            "Removing notify handler for namespace root object\n"));

        if (((HandlerType & ACPI_SYSTEM_NOTIFY) &&

              !AcpiGbl_SystemNotify.Handler)        ||

            ((HandlerType & ACPI_DEVICE_NOTIFY) &&

              !AcpiGbl_DeviceNotify.Handler))

        {

            Status = AE_NOT_EXIST;

            goto UnlockAndExit;

        }

        if (HandlerType & ACPI_SYSTEM_NOTIFY)

        {

            AcpiGbl_SystemNotify.Node    = NULL;

            AcpiGbl_SystemNotify.Handler = NULL;

            AcpiGbl_SystemNotify.Context = NULL;

        }

        if (HandlerType & ACPI_DEVICE_NOTIFY)

        {

            AcpiGbl_DeviceNotify.Node    = NULL;

            AcpiGbl_DeviceNotify.Handler = NULL;

            AcpiGbl_DeviceNotify.Context = NULL;

        }

    }

    /* All Other Objects */

    else

    {

        /* Notifies allowed on this object? */

        if (!AcpiEvIsNotifyObject (Node))

        {

            Status = AE_TYPE;

            goto UnlockAndExit;

        }

        /* Check for an existing internal object */

        ObjDesc = AcpiNsGetAttachedObject (Node);

        if (!ObjDesc)

        {

            Status = AE_NOT_EXIST;

            goto UnlockAndExit;

        }

        /* Object exists - make sure there's an existing handler */

        if (HandlerType & ACPI_SYSTEM_NOTIFY)

        {

            NotifyObj = ObjDesc->CommonNotify.SystemNotify;

            if (!NotifyObj)

            {

                Status = AE_NOT_EXIST;

                goto UnlockAndExit;

            }

            if (NotifyObj->Notify.Handler != Handler)

            {

                Status = AE_BAD_PARAMETER;

                goto UnlockAndExit;

            }

            /* Remove the handler */

            ObjDesc->CommonNotify.SystemNotify = NULL;

            AcpiUtRemoveReference (NotifyObj);

        }

        if (HandlerType & ACPI_DEVICE_NOTIFY)

        {

            NotifyObj = ObjDesc->CommonNotify.DeviceNotify;

            if (!NotifyObj)

            {

                Status = AE_NOT_EXIST;

                goto UnlockAndExit;

            }

            if (NotifyObj->Notify.Handler != Handler)

            {

                Status = AE_BAD_PARAMETER;

                goto UnlockAndExit;

            }

            /* Remove the handler */

            ObjDesc->CommonNotify.DeviceNotify = NULL;

            AcpiUtRemoveReference (NotifyObj);

        }

    }

UnlockAndExit:

    (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);

    return_ACPI_STATUS (Status);

}

ACPI_EXPORT_SYMBOL (AcpiRemoveNotifyHandler)

/*******************************************************************************

 *

 * FUNCTION:    AcpiInstallGpeHandler

 *

 * PARAMETERS:  GpeDevice       - Namespace node for the GPE (NULL for FADT

 *                                defined GPEs)

 *              GpeNumber       - The GPE number within the GPE block

 *              Type            - Whether this GPE should be treated as an

 *                                edge- or level-triggered interrupt.

 *              Address         - Address of the handler

 *              Context         - Value passed to the handler on each GPE

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Install a handler for a General Purpose Event.

 *

 ******************************************************************************/

ACPI_STATUS

AcpiInstallGpeHandler (

    ACPI_HANDLE             GpeDevice,

    UINT32                  GpeNumber,

    UINT32                  Type,

    ACPI_GPE_HANDLER        Address,

    void                    *Context)

{

    ACPI_GPE_EVENT_INFO     *GpeEventInfo;

    ACPI_GPE_HANDLER_INFO   *Handler;

    ACPI_STATUS             Status;

    ACPI_CPU_FLAGS          Flags;

    ACPI_FUNCTION_TRACE (AcpiInstallGpeHandler);

    /* Parameter validation */

    if ((!Address) || (Type & ~ACPI_GPE_XRUPT_TYPE_MASK))

    {

        return_ACPI_STATUS (AE_BAD_PARAMETER);

    }

    Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);

    if (ACPI_FAILURE (Status))

    {

        return_ACPI_STATUS (Status);

    }

    /* Allocate and init handler object (before lock) */

    Handler = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_GPE_HANDLER_INFO));

    if (!Handler)

    {

        Status = AE_NO_MEMORY;

        goto UnlockAndExit;

    }

    Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);

    /* Ensure that we have a valid GPE number */

    GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber);

    if (!GpeEventInfo)

    {

        Status = AE_BAD_PARAMETER;

        goto FreeAndExit;

    }

    /* Make sure that there isn't a handler there already */

    if ((GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) ==

            ACPI_GPE_DISPATCH_HANDLER)

    {

        Status = AE_ALREADY_EXISTS;

        goto FreeAndExit;

    }

    Handler->Address = Address;

    Handler->Context = Context;

    Handler->MethodNode = GpeEventInfo->Dispatch.MethodNode;

    Handler->OriginalFlags = (UINT8) (GpeEventInfo->Flags &

        (ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK));

    /*

     * If the GPE is associated with a method, it may have been enabled

     * automatically during initialization, in which case it has to be

     * disabled now to avoid spurious execution of the handler.

     */

    if (((Handler->OriginalFlags & ACPI_GPE_DISPATCH_METHOD) ||

         (Handler->OriginalFlags & ACPI_GPE_DISPATCH_NOTIFY)) &&

        GpeEventInfo->RuntimeCount)

    {

        Handler->OriginallyEnabled = TRUE;

        (void) AcpiEvRemoveGpeReference (GpeEventInfo);

        /* Sanity check of original type against new type */

        if (Type != (UINT32) (GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK))

        {

            ACPI_WARNING ((AE_INFO, "GPE type mismatch (level/edge)"));

        }

    }

    /* Install the handler */

    GpeEventInfo->Dispatch.Handler = Handler;

    /* Setup up dispatch flags to indicate handler (vs. method/notify) */

    GpeEventInfo->Flags &= ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);

    GpeEventInfo->Flags |= (UINT8) (Type | ACPI_GPE_DISPATCH_HANDLER);

    AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);

UnlockAndExit:

    (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);

    return_ACPI_STATUS (Status);

FreeAndExit:

    AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);

    ACPI_FREE (Handler);

    goto UnlockAndExit;

}

ACPI_EXPORT_SYMBOL (AcpiInstallGpeHandler)

/*******************************************************************************

 *

 * FUNCTION:    AcpiRemoveGpeHandler

 *

 * PARAMETERS:  GpeDevice       - Namespace node for the GPE (NULL for FADT

 *                                defined GPEs)

 *              GpeNumber       - The event to remove a handler

 *              Address         - Address of the handler

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Remove a handler for a General Purpose AcpiEvent.

 *

 ******************************************************************************/

ACPI_STATUS

AcpiRemoveGpeHandler (

    ACPI_HANDLE             GpeDevice,

    UINT32                  GpeNumber,

    ACPI_GPE_HANDLER        Address)

{

    ACPI_GPE_EVENT_INFO     *GpeEventInfo;

    ACPI_GPE_HANDLER_INFO   *Handler;

    ACPI_STATUS             Status;

    ACPI_CPU_FLAGS          Flags;

    ACPI_FUNCTION_TRACE (AcpiRemoveGpeHandler);

    /* Parameter validation */

    if (!Address)

    {

        return_ACPI_STATUS (AE_BAD_PARAMETER);

    }

    Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);

    if (ACPI_FAILURE (Status))

    {

        return_ACPI_STATUS (Status);

    }

    Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);

    /* Ensure that we have a valid GPE number */

    GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber);

    if (!GpeEventInfo)

    {

        Status = AE_BAD_PARAMETER;

        goto UnlockAndExit;

    }

    /* Make sure that a handler is indeed installed */

    if ((GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) !=

            ACPI_GPE_DISPATCH_HANDLER)

    {

        Status = AE_NOT_EXIST;

        goto UnlockAndExit;

    }

    /* Make sure that the installed handler is the same */

    if (GpeEventInfo->Dispatch.Handler->Address != Address)

    {

        Status = AE_BAD_PARAMETER;

        goto UnlockAndExit;

    }

    /* Remove the handler */

    Handler = GpeEventInfo->Dispatch.Handler;

    /* Restore Method node (if any), set dispatch flags */

    GpeEventInfo->Dispatch.MethodNode = Handler->MethodNode;

    GpeEventInfo->Flags &=

        ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);

    GpeEventInfo->Flags |= Handler->OriginalFlags;

    /*

     * If the GPE was previously associated with a method and it was

     * enabled, it should be enabled at this point to restore the

     * post-initialization configuration.

     */

    if ((Handler->OriginalFlags & ACPI_GPE_DISPATCH_METHOD) &&

        Handler->OriginallyEnabled)

    {

        (void) AcpiEvAddGpeReference (GpeEventInfo);

    }

    /* Now we can free the handler object */

    ACPI_FREE (Handler);

UnlockAndExit:

    AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);

    (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);

    return_ACPI_STATUS (Status);

}

ACPI_EXPORT_SYMBOL (AcpiRemoveGpeHandler)

/*******************************************************************************

 *

 * FUNCTION:    AcpiAcquireGlobalLock

 *

 * PARAMETERS:  Timeout         - How long the caller is willing to wait

 *              Handle          - Where the handle to the lock is returned

 *                                (if acquired)

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Acquire the ACPI Global Lock

 *

 * Note: Allows callers with the same thread ID to acquire the global lock

 * multiple times. In other words, externally, the behavior of the global lock

 * is identical to an AML mutex. On the first acquire, a new handle is

 * returned. On any subsequent calls to acquire by the same thread, the same

 * handle is returned.

 *

 ******************************************************************************/

ACPI_STATUS

AcpiAcquireGlobalLock (

    UINT16                  Timeout,

    UINT32                  *Handle)

{

    ACPI_STATUS             Status;

    if (!Handle)

    {

        return (AE_BAD_PARAMETER);

    }

    /* Must lock interpreter to prevent race conditions */

    AcpiExEnterInterpreter ();

    Status = AcpiExAcquireMutexObject (Timeout,

                AcpiGbl_GlobalLockMutex, AcpiOsGetThreadId ());

    if (ACPI_SUCCESS (Status))

    {

        /* Return the global lock handle (updated in AcpiEvAcquireGlobalLock) */

        *Handle = AcpiGbl_GlobalLockHandle;

    }

    AcpiExExitInterpreter ();

    return (Status);

}

ACPI_EXPORT_SYMBOL (AcpiAcquireGlobalLock)

/*******************************************************************************

 *

 * FUNCTION:    AcpiReleaseGlobalLock

 *

 * PARAMETERS:  Handle      - Returned from AcpiAcquireGlobalLock

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Release the ACPI Global Lock. The handle must be valid.

 *

 ******************************************************************************/

ACPI_STATUS

AcpiReleaseGlobalLock (

    UINT32                  Handle)

{

    ACPI_STATUS             Status;

    if (!Handle || (Handle != AcpiGbl_GlobalLockHandle))

    {

        return (AE_NOT_ACQUIRED);

    }

    Status = AcpiExReleaseMutexObject (AcpiGbl_GlobalLockMutex);

    return (Status);

}

ACPI_EXPORT_SYMBOL (AcpiReleaseGlobalLock)