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

 *

 * Module Name: nsobject - Utilities for objects attached to namespace

 *                         table entries

 *

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

/*

 * Copyright (C) 2000 - 2007, R. Byron Moore

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions, and the following disclaimer,

 *    without modification.

 * 2. Redistributions in binary form must reproduce at minimum a disclaimer

 *    substantially similar to the "NO WARRANTY" disclaimer below

 *    ("Disclaimer") and any redistribution must be conditioned upon

 *    including a substantially similar Disclaimer requirement for further

 *    binary redistribution.

 * 3. Neither the names of the above-listed copyright holders nor the names

 *    of any contributors may be used to endorse or promote products derived

 *    from this software without specific prior written permission.

 *

 * Alternatively, this software may be distributed under the terms of the

 * GNU General Public License ("GPL") version 2 as published by the Free

 * Software Foundation.

 *

 * NO WARRANTY

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR

 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING

 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGES.

 */

#include <acpi/acpi.h>

#include <acpi/acnamesp.h>

#define _COMPONENT          ACPI_NAMESPACE

ACPI_MODULE_NAME("nsobject")

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

 *

 * FUNCTION:    acpi_ns_attach_object

 *

 * PARAMETERS:  Node                - Parent Node

 *              Object              - Object to be attached

 *              Type                - Type of object, or ACPI_TYPE_ANY if not

 *                                    known

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Record the given object as the value associated with the

 *              name whose acpi_handle is passed.  If Object is NULL

 *              and Type is ACPI_TYPE_ANY, set the name as having no value.

 *              Note: Future may require that the Node->Flags field be passed

 *              as a parameter.

 *

 * MUTEX:       Assumes namespace is locked

 *

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

acpi_status

acpi_ns_attach_object(struct acpi_namespace_node *node,

                      union acpi_operand_object *object, acpi_object_type type)

{

        union acpi_operand_object *obj_desc;

        union acpi_operand_object *last_obj_desc;

        acpi_object_type object_type = ACPI_TYPE_ANY;

        ACPI_FUNCTION_TRACE(ns_attach_object);

        /*

         * Parameter validation

         */

        if (!node) {

                /* Invalid handle */

                ACPI_ERROR((AE_INFO, "Null NamedObj handle"));

                return_ACPI_STATUS(AE_BAD_PARAMETER);

        }

        if (!object && (ACPI_TYPE_ANY != type)) {

                /* Null object */

                ACPI_ERROR((AE_INFO,

                            "Null object, but type not ACPI_TYPE_ANY"));

                return_ACPI_STATUS(AE_BAD_PARAMETER);

        }

        if (ACPI_GET_DESCRIPTOR_TYPE(node) != ACPI_DESC_TYPE_NAMED) {

                /* Not a name handle */

                ACPI_ERROR((AE_INFO, "Invalid handle %p [%s]",

                            node, acpi_ut_get_descriptor_name(node)));

                return_ACPI_STATUS(AE_BAD_PARAMETER);

        }

        /* Check if this object is already attached */

        if (node->object == object) {

                ACPI_DEBUG_PRINT((ACPI_DB_EXEC,

                                  "Obj %p already installed in NameObj %p\n",

                                  object, node));

                return_ACPI_STATUS(AE_OK);

        }

        /* If null object, we will just install it */

        if (!object) {

                obj_desc = NULL;

                object_type = ACPI_TYPE_ANY;

        }

        /*

         * If the source object is a namespace Node with an attached object,

         * we will use that (attached) object

         */

        else if ((ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED) &&

                 ((struct acpi_namespace_node *)object)->object) {

                /*

                 * Value passed is a name handle and that name has a

                 * non-null value.  Use that name's value and type.

                 */

                obj_desc = ((struct acpi_namespace_node *)object)->object;

                object_type = ((struct acpi_namespace_node *)object)->type;

        }

        /*

         * Otherwise, we will use the parameter object, but we must type

         * it first

         */

        else {

                obj_desc = (union acpi_operand_object *)object;

                /* Use the given type */

                object_type = type;

        }

        ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Installing %p into Node %p [%4.4s]\n",

                          obj_desc, node, acpi_ut_get_node_name(node)));

        /* Detach an existing attached object if present */

        if (node->object) {

                acpi_ns_detach_object(node);

        }

        if (obj_desc) {

                /*

                 * Must increment the new value's reference count

                 * (if it is an internal object)

                 */

                acpi_ut_add_reference(obj_desc);

                /*

                 * Handle objects with multiple descriptors - walk

                 * to the end of the descriptor list

                 */

                last_obj_desc = obj_desc;

                while (last_obj_desc->common.next_object) {

                        last_obj_desc = last_obj_desc->common.next_object;

                }

                /* Install the object at the front of the object list */

                last_obj_desc->common.next_object = node->object;

        }

        node->type = (u8) object_type;

        node->object = obj_desc;

        return_ACPI_STATUS(AE_OK);

}

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

 *

 * FUNCTION:    acpi_ns_detach_object

 *

 * PARAMETERS:  Node           - A Namespace node whose object will be detached

 *

 * 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 acpi_ns_detach_object(struct acpi_namespace_node *node)

{

        union acpi_operand_object *obj_desc;

        ACPI_FUNCTION_TRACE(ns_detach_object);

        obj_desc = node->object;

        if (!obj_desc ||

            (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA)) {

                return_VOID;

        }

        /* Clear the entry in all cases */

        node->object = NULL;

        if (ACPI_GET_DESCRIPTOR_TYPE(obj_desc) == ACPI_DESC_TYPE_OPERAND) {

                node->object = obj_desc->common.next_object;

                if (node->object &&

                    (ACPI_GET_OBJECT_TYPE(node->object) !=

                     ACPI_TYPE_LOCAL_DATA)) {

                        node->object = node->object->common.next_object;

                }

        }

        /* 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, acpi_ut_get_node_name(node), obj_desc));

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

        acpi_ut_remove_reference(obj_desc);

        return_VOID;

}

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

 *

 * FUNCTION:    acpi_ns_get_attached_object

 *

 * 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.

 *

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

union acpi_operand_object *acpi_ns_get_attached_object(struct

                                                       acpi_namespace_node

                                                       *node)

{

        ACPI_FUNCTION_TRACE_PTR(ns_get_attached_object, 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:    acpi_ns_get_secondary_object

 *

 * 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.

 *

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

union acpi_operand_object *acpi_ns_get_secondary_object(union

                                                        acpi_operand_object

                                                        *obj_desc)

{

        ACPI_FUNCTION_TRACE_PTR(ns_get_secondary_object, obj_desc);

        if ((!obj_desc) ||

            (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA) ||

            (!obj_desc->common.next_object) ||

            (ACPI_GET_OBJECT_TYPE(obj_desc->common.next_object) ==

             ACPI_TYPE_LOCAL_DATA)) {

                return_PTR(NULL);

        }

        return_PTR(obj_desc->common.next_object);

}

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

 *

 * FUNCTION:    acpi_ns_attach_data

 *

 * 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

acpi_ns_attach_data(struct acpi_namespace_node *node,

                    acpi_object_handler handler, void *data)

{

        union acpi_operand_object *prev_obj_desc;

        union acpi_operand_object *obj_desc;

        union acpi_operand_object *data_desc;

        /* We only allow one attachment per handler */

        prev_obj_desc = NULL;

        obj_desc = node->object;

        while (obj_desc) {

                if ((ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA) &&

                    (obj_desc->data.handler == handler)) {

                        return (AE_ALREADY_EXISTS);

                }

                prev_obj_desc = obj_desc;

                obj_desc = obj_desc->common.next_object;

        }

        /* Create an internal object for the data */

        data_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_DATA);

        if (!data_desc) {

                return (AE_NO_MEMORY);

        }

        data_desc->data.handler = handler;

        data_desc->data.pointer = data;

        /* Install the data object */

        if (prev_obj_desc) {

                prev_obj_desc->common.next_object = data_desc;

        } else {

                node->object = data_desc;

        }

        return (AE_OK);

}

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

 *

 * FUNCTION:    acpi_ns_detach_data

 *

 * 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

acpi_ns_detach_data(struct acpi_namespace_node * node,

                    acpi_object_handler handler)

{

        union acpi_operand_object *obj_desc;

        union acpi_operand_object *prev_obj_desc;

        prev_obj_desc = NULL;

        obj_desc = node->object;

        while (obj_desc) {

                if ((ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA) &&

                    (obj_desc->data.handler == handler)) {

                        if (prev_obj_desc) {

                                prev_obj_desc->common.next_object =

                                    obj_desc->common.next_object;

                        } else {

                                node->object = obj_desc->common.next_object;

                        }

                        acpi_ut_remove_reference(obj_desc);

                        return (AE_OK);

                }

                prev_obj_desc = obj_desc;

                obj_desc = obj_desc->common.next_object;

        }

        return (AE_NOT_FOUND);

}

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

 *

 * FUNCTION:    acpi_ns_get_attached_data

 *

 * 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

acpi_ns_get_attached_data(struct acpi_namespace_node * node,

                          acpi_object_handler handler, void **data)

{

        union acpi_operand_object *obj_desc;

        obj_desc = node->object;

        while (obj_desc) {

                if ((ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA) &&

                    (obj_desc->data.handler == handler)) {

                        *data = obj_desc->data.pointer;

                        return (AE_OK);

                }

                obj_desc = obj_desc->common.next_object;

        }

        return (AE_NOT_FOUND);

}