nsobject.c

acpi tools for linux include acpiexec and acpixtract

 *
 * RETURN:      None.
 *
 * DESCRIPTION: Detach/delete an object associated with a namespace node.
 *              if the object is an allocated object, it is freed.
 *              Otherwise, the field is simply cleared.
 *
 ******************************************************************************/

void
AcpiNsDetachObject (
    ACPI_NAMESPACE_NODE     *Node)
{
    ACPI_OPERAND_OBJECT     *ObjDesc;


    ACPI_FUNCTION_TRACE (NsDetachObject);


    ObjDesc = Node->Object;

    if (!ObjDesc ||
        (ACPI_GET_OBJECT_TYPE (ObjDesc) == ACPI_TYPE_LOCAL_DATA))
    {
        return_VOID;
    }

    /* Clear the entry in all cases */

    Node->Object = NULL;
    if (ACPI_GET_DESCRIPTOR_TYPE (ObjDesc) == ACPI_DESC_TYPE_OPERAND)
    {
        Node->Object = ObjDesc->Common.NextObject;
        if (Node->Object &&
           (ACPI_GET_OBJECT_TYPE (Node->Object) != ACPI_TYPE_LOCAL_DATA))
        {
            Node->Object = Node->Object->Common.NextObject;
        }
    }

    /* Reset the node type to untyped */

    Node->Type = ACPI_TYPE_ANY;

    ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Node %p [%4.4s] Object %p\n",
        Node, AcpiUtGetNodeName (Node), ObjDesc));

    /* Remove one reference on the object (and all subobjects) */

    AcpiUtRemoveReference (ObjDesc);
    return_VOID;
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiNsGetAttachedObject
 *
 * PARAMETERS:  Node             - Namespace node
 *
 * RETURN:      Current value of the object field from the Node whose
 *              handle is passed
 *
 * DESCRIPTION: Obtain the object attached to a namespace node.
 *
 ******************************************************************************/

ACPI_OPERAND_OBJECT *
AcpiNsGetAttachedObject (
    ACPI_NAMESPACE_NODE     *Node)
{
    ACPI_FUNCTION_TRACE_PTR (NsGetAttachedObject, Node);


    if (!Node)
    {
        ACPI_WARNING ((AE_INFO, "Null Node ptr"));
        return_PTR (NULL);
    }

    if (!Node->Object ||
            ((ACPI_GET_DESCRIPTOR_TYPE (Node->Object) != ACPI_DESC_TYPE_OPERAND) &&
             (ACPI_GET_DESCRIPTOR_TYPE (Node->Object) != ACPI_DESC_TYPE_NAMED))  ||
        (ACPI_GET_OBJECT_TYPE (Node->Object) == ACPI_TYPE_LOCAL_DATA))
    {
        return_PTR (NULL);
    }

    return_PTR (Node->Object);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiNsGetSecondaryObject
 *
 * PARAMETERS:  Node             - Namespace node
 *
 * RETURN:      Current value of the object field from the Node whose
 *              handle is passed.
 *
 * DESCRIPTION: Obtain a secondary object associated with a namespace node.
 *
 ******************************************************************************/

ACPI_OPERAND_OBJECT *
AcpiNsGetSecondaryObject (
    ACPI_OPERAND_OBJECT     *ObjDesc)
{
    ACPI_FUNCTION_TRACE_PTR (NsGetSecondaryObject, ObjDesc);


    if ((!ObjDesc)                                                ||
        (ACPI_GET_OBJECT_TYPE (ObjDesc) == ACPI_TYPE_LOCAL_DATA)  ||
        (!ObjDesc->Common.NextObject)                             ||
        (ACPI_GET_OBJECT_TYPE (ObjDesc->Common.NextObject) == ACPI_TYPE_LOCAL_DATA))
    {
        return_PTR (NULL);
    }

    return_PTR (ObjDesc->Common.NextObject);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiNsAttachData
 *
 * PARAMETERS:  Node            - Namespace node
 *              Handler         - Handler to be associated with the data
 *              Data            - Data to be attached
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Low-level attach data.  Create and attach a Data object.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiNsAttachData (
    ACPI_NAMESPACE_NODE     *Node,
    ACPI_OBJECT_HANDLER     Handler,
    void                    *Data)
{
    ACPI_OPERAND_OBJECT     *PrevObjDesc;
    ACPI_OPERAND_OBJECT     *ObjDesc;
    ACPI_OPERAND_OBJECT     *DataDesc;


    /* We only allow one attachment per handler */

    PrevObjDesc = NULL;
    ObjDesc = Node->Object;
    while (ObjDesc)
    {
        if ((ACPI_GET_OBJECT_TYPE (ObjDesc) == ACPI_TYPE_LOCAL_DATA) &&
            (ObjDesc->Data.Handler == Handler))
        {
            return (AE_ALREADY_EXISTS);
        }

        PrevObjDesc = ObjDesc;
        ObjDesc = ObjDesc->Common.NextObject;
    }

    /* Create an internal object for the data */

    DataDesc = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_DATA);
    if (!DataDesc)
    {
        return (AE_NO_MEMORY);
    }

    DataDesc->Data.Handler = Handler;
    DataDesc->Data.Pointer = Data;

    /* Install the data object */

    if (PrevObjDesc)
    {
        PrevObjDesc->Common.NextObject = DataDesc;
    }
    else
    {
        Node->Object = DataDesc;
    }

    return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiNsDetachData
 *
 * PARAMETERS:  Node            - Namespace node
 *              Handler         - Handler associated with the data
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Low-level detach data.  Delete the data node, but the caller
 *              is responsible for the actual data.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiNsDetachData (
    ACPI_NAMESPACE_NODE     *Node,
    ACPI_OBJECT_HANDLER     Handler)
{
    ACPI_OPERAND_OBJECT     *ObjDesc;
    ACPI_OPERAND_OBJECT     *PrevObjDesc;


    PrevObjDesc = NULL;
    ObjDesc = Node->Object;
    while (ObjDesc)
    {
        if ((ACPI_GET_OBJECT_TYPE (ObjDesc) == ACPI_TYPE_LOCAL_DATA) &&
            (ObjDesc->Data.Handler == Handler))
        {
            if (PrevObjDesc)
            {
                PrevObjDesc->Common.NextObject = ObjDesc->Common.NextObject;
            }
            else
            {
                Node->Object = ObjDesc->Common.NextObject;
            }

            AcpiUtRemoveReference (ObjDesc);
            return (AE_OK);
        }

        PrevObjDesc = ObjDesc;
        ObjDesc = ObjDesc->Common.NextObject;
    }

    return (AE_NOT_FOUND);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiNsGetAttachedData
 *
 * PARAMETERS:  Node            - Namespace node
 *              Handler         - Handler associated with the data
 *              Data            - Where the data is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Low level interface to obtain data previously associated with
 *              a namespace node.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiNsGetAttachedData (
    ACPI_NAMESPACE_NODE     *Node,
    ACPI_OBJECT_HANDLER     Handler,
    void                    **Data)
{
    ACPI_OPERAND_OBJECT     *ObjDesc;


    ObjDesc = Node->Object;
    while (ObjDesc)
    {
        if ((ACPI_GET_OBJECT_TYPE (ObjDesc) == ACPI_TYPE_LOCAL_DATA) &&
            (ObjDesc->Data.Handler == Handler))
        {
            *Data = ObjDesc->Data.Pointer;
            return (AE_OK);
        }

        ObjDesc = ObjDesc->Common.NextObject;
    }

    return (AE_NOT_FOUND);
}