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.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
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.
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
34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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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,
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42 * POSSIBILITY OF SUCH DAMAGES.
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
)
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