1 /*******************************************************************************
3 * Module Name: nsxfobj - Public interfaces to the ACPI subsystem
4 * ACPI Object oriented interfaces
6 ******************************************************************************/
9 * Copyright (C) 2000 - 2008, Intel Corp.
10 * All rights reserved.
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13 * modification, are permitted provided that the following conditions
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17 * without modification.
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19 * substantially similar to the "NO WARRANTY" disclaimer below
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21 * including a substantially similar Disclaimer requirement for further
22 * binary redistribution.
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24 * of any contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
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.
32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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45 #include <acpi/acpi.h>
49 #define _COMPONENT ACPI_NAMESPACE
50 ACPI_MODULE_NAME("nsxfobj")
52 /*******************************************************************************
54 * FUNCTION: acpi_get_id
56 * PARAMETERS: Handle - Handle of object whose id is desired
57 * ret_id - Where the id will be placed
61 * DESCRIPTION: This routine returns the owner id associated with a handle
63 ******************************************************************************/
64 acpi_status acpi_get_id(acpi_handle handle, acpi_owner_id * ret_id)
66 struct acpi_namespace_node *node;
69 /* Parameter Validation */
72 return (AE_BAD_PARAMETER);
75 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
76 if (ACPI_FAILURE(status)) {
80 /* Convert and validate the handle */
82 node = acpi_ns_map_handle_to_node(handle);
84 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
85 return (AE_BAD_PARAMETER);
88 *ret_id = node->owner_id;
90 status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
94 ACPI_EXPORT_SYMBOL(acpi_get_id)
96 /*******************************************************************************
98 * FUNCTION: acpi_get_type
100 * PARAMETERS: Handle - Handle of object whose type is desired
101 * ret_type - Where the type will be placed
105 * DESCRIPTION: This routine returns the type associatd with a particular handle
107 ******************************************************************************/
108 acpi_status acpi_get_type(acpi_handle handle, acpi_object_type * ret_type)
110 struct acpi_namespace_node *node;
113 /* Parameter Validation */
116 return (AE_BAD_PARAMETER);
120 * Special case for the predefined Root Node
123 if (handle == ACPI_ROOT_OBJECT) {
124 *ret_type = ACPI_TYPE_ANY;
128 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
129 if (ACPI_FAILURE(status)) {
133 /* Convert and validate the handle */
135 node = acpi_ns_map_handle_to_node(handle);
137 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
138 return (AE_BAD_PARAMETER);
141 *ret_type = node->type;
143 status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
147 ACPI_EXPORT_SYMBOL(acpi_get_type)
149 /*******************************************************************************
151 * FUNCTION: acpi_get_parent
153 * PARAMETERS: Handle - Handle of object whose parent is desired
154 * ret_handle - Where the parent handle will be placed
158 * DESCRIPTION: Returns a handle to the parent of the object represented by
161 ******************************************************************************/
162 acpi_status acpi_get_parent(acpi_handle handle, acpi_handle * ret_handle)
164 struct acpi_namespace_node *node;
168 return (AE_BAD_PARAMETER);
171 /* Special case for the predefined Root Node (no parent) */
173 if (handle == ACPI_ROOT_OBJECT) {
174 return (AE_NULL_ENTRY);
177 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
178 if (ACPI_FAILURE(status)) {
182 /* Convert and validate the handle */
184 node = acpi_ns_map_handle_to_node(handle);
186 status = AE_BAD_PARAMETER;
187 goto unlock_and_exit;
190 /* Get the parent entry */
193 acpi_ns_convert_entry_to_handle(acpi_ns_get_parent_node(node));
195 /* Return exception if parent is null */
197 if (!acpi_ns_get_parent_node(node)) {
198 status = AE_NULL_ENTRY;
203 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
207 ACPI_EXPORT_SYMBOL(acpi_get_parent)
209 /*******************************************************************************
211 * FUNCTION: acpi_get_next_object
213 * PARAMETERS: Type - Type of object to be searched for
214 * Parent - Parent object whose children we are getting
215 * last_child - Previous child that was found.
216 * The NEXT child will be returned
217 * ret_handle - Where handle to the next object is placed
221 * DESCRIPTION: Return the next peer object within the namespace. If Handle is
222 * valid, Scope is ignored. Otherwise, the first object within
225 ******************************************************************************/
227 acpi_get_next_object(acpi_object_type type,
229 acpi_handle child, acpi_handle * ret_handle)
232 struct acpi_namespace_node *node;
233 struct acpi_namespace_node *parent_node = NULL;
234 struct acpi_namespace_node *child_node = NULL;
236 /* Parameter validation */
238 if (type > ACPI_TYPE_EXTERNAL_MAX) {
239 return (AE_BAD_PARAMETER);
242 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
243 if (ACPI_FAILURE(status)) {
247 /* If null handle, use the parent */
251 /* Start search at the beginning of the specified scope */
253 parent_node = acpi_ns_map_handle_to_node(parent);
255 status = AE_BAD_PARAMETER;
256 goto unlock_and_exit;
259 /* Non-null handle, ignore the parent */
260 /* Convert and validate the handle */
262 child_node = acpi_ns_map_handle_to_node(child);
264 status = AE_BAD_PARAMETER;
265 goto unlock_and_exit;
269 /* Internal function does the real work */
271 node = acpi_ns_get_next_node(type, parent_node, child_node);
273 status = AE_NOT_FOUND;
274 goto unlock_and_exit;
278 *ret_handle = acpi_ns_convert_entry_to_handle(node);
283 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
287 ACPI_EXPORT_SYMBOL(acpi_get_next_object)