[deliverable/linux.git] / drivers / acpi / namespace / nsobject.c

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

/*
 * Copyright (C) 2000 - 2006, 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_REPORT_ERROR(("Null named_obj handle\n"));
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	if (!object && (ACPI_TYPE_ANY != type)) {
		/* Null object */

		ACPI_REPORT_ERROR(("Null object, but type not ACPI_TYPE_ANY\n"));
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	if (ACPI_GET_DESCRIPTOR_TYPE(node) != ACPI_DESC_TYPE_NAMED) {
		/* Not a name handle */

		ACPI_REPORT_ERROR(("Invalid handle %p [%s]\n",
				   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 name_obj %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_REPORT_WARNING(("Null Node ptr\n"));
		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);
}
Commit	Line	Data
1da177e4 LT	1	/*******************************************************************************
	2	*
	3	* Module Name: nsobject - Utilities for objects attached to namespace
	4	* table entries
	5	*
	6	******************************************************************************/
	7
	8	/*
4a90c7e8	9	* Copyright (C) 2000 - 2006, R. Byron Moore
1da177e4 LT	10	* All rights reserved.
	11	*
	12	* Redistribution and use in source and binary forms, with or without
	13	* modification, are permitted provided that the following conditions
	14	* are met:
	15	* 1. Redistributions of source code must retain the above copyright
	16	* notice, this list of conditions, and the following disclaimer,
	17	* without modification.
	18	* 2. Redistributions in binary form must reproduce at minimum a disclaimer
	19	* substantially similar to the "NO WARRANTY" disclaimer below
	20	* ("Disclaimer") and any redistribution must be conditioned upon
	21	* including a substantially similar Disclaimer requirement for further
	22	* binary redistribution.
	23	* 3. Neither the names of the above-listed copyright holders nor the names
	24	* of any contributors may be used to endorse or promote products derived
	25	* from this software without specific prior written permission.
	26	*
	27	* Alternatively, this software may be distributed under the terms of the
	28	* GNU General Public License ("GPL") version 2 as published by the Free
	29	* Software Foundation.
	30	*
	31	* NO WARRANTY
	32	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	33	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	34	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
	35	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	36	* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	37	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	38	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	39	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	40	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
	41	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	42	* POSSIBILITY OF SUCH DAMAGES.
	43	*/
	44
1da177e4 LT	45	#include <acpi/acpi.h>
	46	#include <acpi/acnamesp.h>
	47
1da177e4	48	#define _COMPONENT ACPI_NAMESPACE
4be44fcd	49	ACPI_MODULE_NAME("nsobject")
1da177e4 LT	50
	51	/*******************************************************************************
	52	*
	53	* FUNCTION: acpi_ns_attach_object
	54	*
	55	* PARAMETERS: Node - Parent Node
	56	* Object - Object to be attached
	57	* Type - Type of object, or ACPI_TYPE_ANY if not
	58	* known
	59	*
44f6c012 RM	60	* RETURN: Status
44f6c012 RM	61	*
1da177e4 LT	62	* DESCRIPTION: Record the given object as the value associated with the
	63	* name whose acpi_handle is passed. If Object is NULL
	64	* and Type is ACPI_TYPE_ANY, set the name as having no value.
	65	* Note: Future may require that the Node->Flags field be passed
	66	* as a parameter.
	67	*
	68	* MUTEX: Assumes namespace is locked
	69	*
	70	******************************************************************************/
1da177e4	71	acpi_status
4be44fcd LB	72	acpi_ns_attach_object(struct acpi_namespace_node *node,
4be44fcd LB	73	union acpi_operand_object *object, acpi_object_type type)
1da177e4	74	{
4be44fcd LB	75	union acpi_operand_object *obj_desc;
	76	union acpi_operand_object *last_obj_desc;
	77	acpi_object_type object_type = ACPI_TYPE_ANY;
1da177e4	78
4be44fcd	79	ACPI_FUNCTION_TRACE("ns_attach_object");
1da177e4 LT	80
	81	/*
	82	* Parameter validation
	83	*/
	84	if (!node) {
	85	/* Invalid handle */
	86
4a90c7e8	87	ACPI_REPORT_ERROR(("Null named_obj handle\n"));
4be44fcd	88	return_ACPI_STATUS(AE_BAD_PARAMETER);
1da177e4 LT	89	}
	90
	91	if (!object && (ACPI_TYPE_ANY != type)) {
	92	/* Null object */
	93
4a90c7e8	94	ACPI_REPORT_ERROR(("Null object, but type not ACPI_TYPE_ANY\n"));
4be44fcd	95	return_ACPI_STATUS(AE_BAD_PARAMETER);
1da177e4 LT	96	}
1da177e4 LT	97
4be44fcd	98	if (ACPI_GET_DESCRIPTOR_TYPE(node) != ACPI_DESC_TYPE_NAMED) {
1da177e4 LT	99	/* Not a name handle */
1da177e4 LT	100
4a90c7e8	101	ACPI_REPORT_ERROR(("Invalid handle %p [%s]\n",
4be44fcd LB	102	node, acpi_ut_get_descriptor_name(node)));
4be44fcd LB	103	return_ACPI_STATUS(AE_BAD_PARAMETER);
1da177e4 LT	104	}
	105
	106	/* Check if this object is already attached */
	107
	108	if (node->object == object) {
4be44fcd LB	109	ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
	110	"Obj %p already installed in name_obj %p\n",
	111	object, node));
1da177e4	112
4be44fcd	113	return_ACPI_STATUS(AE_OK);
1da177e4 LT	114	}
	115
	116	/* If null object, we will just install it */
	117
	118	if (!object) {
4be44fcd	119	obj_desc = NULL;
1da177e4 LT	120	object_type = ACPI_TYPE_ANY;
	121	}
	122
	123	/*
	124	* If the source object is a namespace Node with an attached object,
	125	* we will use that (attached) object
	126	*/
4be44fcd LB	127	else if ((ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED) &&
4be44fcd LB	128	((struct acpi_namespace_node *)object)->object) {
1da177e4 LT	129	/*
	130	* Value passed is a name handle and that name has a
	131	* non-null value. Use that name's value and type.
	132	*/
4be44fcd LB	133	obj_desc = ((struct acpi_namespace_node *)object)->object;
4be44fcd LB	134	object_type = ((struct acpi_namespace_node *)object)->type;
1da177e4 LT	135	}
	136
	137	/*
	138	* Otherwise, we will use the parameter object, but we must type
	139	* it first
	140	*/
	141	else {
4be44fcd	142	obj_desc = (union acpi_operand_object *)object;
1da177e4 LT	143
	144	/* Use the given type */
	145
	146	object_type = type;
	147	}
	148
4be44fcd LB	149	ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Installing %p into Node %p [%4.4s]\n",
4be44fcd LB	150	obj_desc, node, acpi_ut_get_node_name(node)));
1da177e4 LT	151
	152	/* Detach an existing attached object if present */
	153
	154	if (node->object) {
4be44fcd	155	acpi_ns_detach_object(node);
1da177e4 LT	156	}
	157
	158	if (obj_desc) {
	159	/*
	160	* Must increment the new value's reference count
	161	* (if it is an internal object)
	162	*/
4be44fcd	163	acpi_ut_add_reference(obj_desc);
1da177e4 LT	164
	165	/*
	166	* Handle objects with multiple descriptors - walk
	167	* to the end of the descriptor list
	168	*/
	169	last_obj_desc = obj_desc;
	170	while (last_obj_desc->common.next_object) {
	171	last_obj_desc = last_obj_desc->common.next_object;
	172	}
	173
	174	/* Install the object at the front of the object list */
	175
	176	last_obj_desc->common.next_object = node->object;
	177	}
	178
4be44fcd LB	179	node->type = (u8) object_type;
4be44fcd LB	180	node->object = obj_desc;
1da177e4	181
4be44fcd	182	return_ACPI_STATUS(AE_OK);
1da177e4 LT	183	}
1da177e4 LT	184
1da177e4 LT	185	/*******************************************************************************
	186	*
	187	* FUNCTION: acpi_ns_detach_object
	188	*
44f6c012	189	* PARAMETERS: Node - A Namespace node whose object will be detached
1da177e4 LT	190	*
	191	* RETURN: None.
	192	*
	193	* DESCRIPTION: Detach/delete an object associated with a namespace node.
	194	* if the object is an allocated object, it is freed.
	195	* Otherwise, the field is simply cleared.
	196	*
	197	******************************************************************************/
	198
4be44fcd	199	void acpi_ns_detach_object(struct acpi_namespace_node *node)
1da177e4	200	{
4be44fcd	201	union acpi_operand_object *obj_desc;
1da177e4	202
4be44fcd	203	ACPI_FUNCTION_TRACE("ns_detach_object");
1da177e4 LT	204
	205	obj_desc = node->object;
	206
	207	if (!obj_desc \|\|
4be44fcd	208	(ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA)) {
1da177e4 LT	209	return_VOID;
	210	}
	211
	212	/* Clear the entry in all cases */
	213
	214	node->object = NULL;
4be44fcd	215	if (ACPI_GET_DESCRIPTOR_TYPE(obj_desc) == ACPI_DESC_TYPE_OPERAND) {
1da177e4 LT	216	node->object = obj_desc->common.next_object;
1da177e4 LT	217	if (node->object &&
4be44fcd LB	218	(ACPI_GET_OBJECT_TYPE(node->object) !=
4be44fcd LB	219	ACPI_TYPE_LOCAL_DATA)) {
1da177e4 LT	220	node->object = node->object->common.next_object;
	221	}
	222	}
	223
	224	/* Reset the node type to untyped */
	225
	226	node->type = ACPI_TYPE_ANY;
	227
4be44fcd LB	228	ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "Node %p [%4.4s] Object %p\n",
4be44fcd LB	229	node, acpi_ut_get_node_name(node), obj_desc));
1da177e4 LT	230
	231	/* Remove one reference on the object (and all subobjects) */
	232
4be44fcd	233	acpi_ut_remove_reference(obj_desc);
1da177e4 LT	234	return_VOID;
	235	}
	236
1da177e4 LT	237	/*******************************************************************************
	238	*
	239	* FUNCTION: acpi_ns_get_attached_object
	240	*
44f6c012	241	* PARAMETERS: Node - Namespace node
1da177e4 LT	242	*
	243	* RETURN: Current value of the object field from the Node whose
	244	* handle is passed
	245	*
	246	* DESCRIPTION: Obtain the object attached to a namespace node.
	247	*
	248	******************************************************************************/
	249
4be44fcd LB	250	union acpi_operand_object *acpi_ns_get_attached_object(struct
	251	acpi_namespace_node
	252	*node)
1da177e4	253	{
4be44fcd	254	ACPI_FUNCTION_TRACE_PTR("ns_get_attached_object", node);
1da177e4 LT	255
1da177e4 LT	256	if (!node) {
4a90c7e8	257	ACPI_REPORT_WARNING(("Null Node ptr\n"));
4be44fcd	258	return_PTR(NULL);
1da177e4 LT	259	}
	260
	261	if (!node->object \|\|
4be44fcd LB	262	((ACPI_GET_DESCRIPTOR_TYPE(node->object) != ACPI_DESC_TYPE_OPERAND)
	263	&& (ACPI_GET_DESCRIPTOR_TYPE(node->object) !=
	264	ACPI_DESC_TYPE_NAMED))
	265	\|\| (ACPI_GET_OBJECT_TYPE(node->object) == ACPI_TYPE_LOCAL_DATA)) {
	266	return_PTR(NULL);
1da177e4 LT	267	}
1da177e4 LT	268
4be44fcd	269	return_PTR(node->object);
1da177e4 LT	270	}
1da177e4 LT	271
1da177e4 LT	272	/*******************************************************************************
	273	*
	274	* FUNCTION: acpi_ns_get_secondary_object
	275	*
44f6c012	276	* PARAMETERS: Node - Namespace node
1da177e4 LT	277	*
	278	* RETURN: Current value of the object field from the Node whose
	279	* handle is passed.
	280	*
	281	* DESCRIPTION: Obtain a secondary object associated with a namespace node.
	282	*
	283	******************************************************************************/
	284
4be44fcd LB	285	union acpi_operand_object *acpi_ns_get_secondary_object(union
	286	acpi_operand_object
	287	*obj_desc)
1da177e4	288	{
4be44fcd LB	289	ACPI_FUNCTION_TRACE_PTR("ns_get_secondary_object", obj_desc);
	290
	291	if ((!obj_desc) \|\|
	292	(ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA) \|\|
	293	(!obj_desc->common.next_object) \|\|
	294	(ACPI_GET_OBJECT_TYPE(obj_desc->common.next_object) ==
	295	ACPI_TYPE_LOCAL_DATA)) {
	296	return_PTR(NULL);
1da177e4 LT	297	}
1da177e4 LT	298
4be44fcd	299	return_PTR(obj_desc->common.next_object);
1da177e4 LT	300	}
1da177e4 LT	301
1da177e4 LT	302	/*******************************************************************************
	303	*
	304	* FUNCTION: acpi_ns_attach_data
	305	*
	306	* PARAMETERS: Node - Namespace node
	307	* Handler - Handler to be associated with the data
	308	* Data - Data to be attached
	309	*
	310	* RETURN: Status
	311	*
	312	* DESCRIPTION: Low-level attach data. Create and attach a Data object.
	313	*
	314	******************************************************************************/
	315
	316	acpi_status
4be44fcd LB	317	acpi_ns_attach_data(struct acpi_namespace_node *node,
4be44fcd LB	318	acpi_object_handler handler, void *data)
1da177e4	319	{
4be44fcd LB	320	union acpi_operand_object *prev_obj_desc;
	321	union acpi_operand_object *obj_desc;
	322	union acpi_operand_object *data_desc;
1da177e4 LT	323
	324	/* We only allow one attachment per handler */
	325
	326	prev_obj_desc = NULL;
	327	obj_desc = node->object;
	328	while (obj_desc) {
4be44fcd LB	329	if ((ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA) &&
4be44fcd LB	330	(obj_desc->data.handler == handler)) {
1da177e4 LT	331	return (AE_ALREADY_EXISTS);
	332	}
	333
	334	prev_obj_desc = obj_desc;
	335	obj_desc = obj_desc->common.next_object;
	336	}
	337
	338	/* Create an internal object for the data */
	339
4be44fcd	340	data_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_DATA);
1da177e4 LT	341	if (!data_desc) {
	342	return (AE_NO_MEMORY);
	343	}
	344
	345	data_desc->data.handler = handler;
	346	data_desc->data.pointer = data;
	347
	348	/* Install the data object */
	349
	350	if (prev_obj_desc) {
	351	prev_obj_desc->common.next_object = data_desc;
4be44fcd	352	} else {
1da177e4 LT	353	node->object = data_desc;
	354	}
	355
	356	return (AE_OK);
	357	}
	358
1da177e4 LT	359	/*******************************************************************************
	360	*
	361	* FUNCTION: acpi_ns_detach_data
	362	*
	363	* PARAMETERS: Node - Namespace node
	364	* Handler - Handler associated with the data
	365	*
	366	* RETURN: Status
	367	*
	368	* DESCRIPTION: Low-level detach data. Delete the data node, but the caller
	369	* is responsible for the actual data.
	370	*
	371	******************************************************************************/
	372
	373	acpi_status
4be44fcd LB	374	acpi_ns_detach_data(struct acpi_namespace_node * node,
4be44fcd LB	375	acpi_object_handler handler)
1da177e4	376	{
4be44fcd LB	377	union acpi_operand_object *obj_desc;
4be44fcd LB	378	union acpi_operand_object *prev_obj_desc;
1da177e4 LT	379
	380	prev_obj_desc = NULL;
	381	obj_desc = node->object;
	382	while (obj_desc) {
4be44fcd LB	383	if ((ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA) &&
4be44fcd LB	384	(obj_desc->data.handler == handler)) {
1da177e4	385	if (prev_obj_desc) {
4be44fcd LB	386	prev_obj_desc->common.next_object =
	387	obj_desc->common.next_object;
	388	} else {
1da177e4 LT	389	node->object = obj_desc->common.next_object;
	390	}
	391
4be44fcd	392	acpi_ut_remove_reference(obj_desc);
1da177e4 LT	393	return (AE_OK);
	394	}
	395
	396	prev_obj_desc = obj_desc;
	397	obj_desc = obj_desc->common.next_object;
	398	}
	399
	400	return (AE_NOT_FOUND);
	401	}
	402
1da177e4 LT	403	/*******************************************************************************
	404	*
	405	* FUNCTION: acpi_ns_get_attached_data
	406	*
	407	* PARAMETERS: Node - Namespace node
	408	* Handler - Handler associated with the data
	409	* Data - Where the data is returned
	410	*
	411	* RETURN: Status
	412	*
	413	* DESCRIPTION: Low level interface to obtain data previously associated with
	414	* a namespace node.
	415	*
	416	******************************************************************************/
	417
	418	acpi_status
4be44fcd LB	419	acpi_ns_get_attached_data(struct acpi_namespace_node * node,
4be44fcd LB	420	acpi_object_handler handler, void **data)
1da177e4	421	{
4be44fcd	422	union acpi_operand_object *obj_desc;
1da177e4 LT	423
	424	obj_desc = node->object;
	425	while (obj_desc) {
4be44fcd LB	426	if ((ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA) &&
4be44fcd LB	427	(obj_desc->data.handler == handler)) {
1da177e4 LT	428	*data = obj_desc->data.pointer;
	429	return (AE_OK);
	430	}
	431
	432	obj_desc = obj_desc->common.next_object;
	433	}
	434
	435	return (AE_NOT_FOUND);
	436	}