Linux 2.6.20.7
[linux/fpc-iii.git] / drivers / acpi / namespace / nsxfobj.c
bloba18b1c223129820da9513a78be11d1cbb1eb73e2
1 /*******************************************************************************
3 * Module Name: nsxfobj - Public interfaces to the ACPI subsystem
4 * ACPI Object oriented interfaces
6 ******************************************************************************/
8 /*
9 * Copyright (C) 2000 - 2006, R. Byron Moore
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
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.
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.
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.
45 #include <acpi/acpi.h>
46 #include <acpi/acnamesp.h>
48 #define _COMPONENT ACPI_NAMESPACE
49 ACPI_MODULE_NAME("nsxfobj")
51 /*******************************************************************************
53 * FUNCTION: acpi_get_id
55 * PARAMETERS: Handle - Handle of object whose id is desired
56 * ret_id - Where the id will be placed
58 * RETURN: Status
60 * DESCRIPTION: This routine returns the owner id associated with a handle
62 ******************************************************************************/
63 acpi_status acpi_get_id(acpi_handle handle, acpi_owner_id * ret_id)
65 struct acpi_namespace_node *node;
66 acpi_status status;
68 /* Parameter Validation */
70 if (!ret_id) {
71 return (AE_BAD_PARAMETER);
74 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
75 if (ACPI_FAILURE(status)) {
76 return (status);
79 /* Convert and validate the handle */
81 node = acpi_ns_map_handle_to_node(handle);
82 if (!node) {
83 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
84 return (AE_BAD_PARAMETER);
87 *ret_id = node->owner_id;
89 status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
90 return (status);
93 ACPI_EXPORT_SYMBOL(acpi_get_id)
95 /*******************************************************************************
97 * FUNCTION: acpi_get_type
99 * PARAMETERS: Handle - Handle of object whose type is desired
100 * ret_type - Where the type will be placed
102 * RETURN: Status
104 * DESCRIPTION: This routine returns the type associatd with a particular handle
106 ******************************************************************************/
107 acpi_status acpi_get_type(acpi_handle handle, acpi_object_type * ret_type)
109 struct acpi_namespace_node *node;
110 acpi_status status;
112 /* Parameter Validation */
114 if (!ret_type) {
115 return (AE_BAD_PARAMETER);
119 * Special case for the predefined Root Node
120 * (return type ANY)
122 if (handle == ACPI_ROOT_OBJECT) {
123 *ret_type = ACPI_TYPE_ANY;
124 return (AE_OK);
127 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
128 if (ACPI_FAILURE(status)) {
129 return (status);
132 /* Convert and validate the handle */
134 node = acpi_ns_map_handle_to_node(handle);
135 if (!node) {
136 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
137 return (AE_BAD_PARAMETER);
140 *ret_type = node->type;
142 status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
143 return (status);
146 ACPI_EXPORT_SYMBOL(acpi_get_type)
148 /*******************************************************************************
150 * FUNCTION: acpi_get_parent
152 * PARAMETERS: Handle - Handle of object whose parent is desired
153 * ret_handle - Where the parent handle will be placed
155 * RETURN: Status
157 * DESCRIPTION: Returns a handle to the parent of the object represented by
158 * Handle.
160 ******************************************************************************/
161 acpi_status acpi_get_parent(acpi_handle handle, acpi_handle * ret_handle)
163 struct acpi_namespace_node *node;
164 acpi_status status;
166 if (!ret_handle) {
167 return (AE_BAD_PARAMETER);
170 /* Special case for the predefined Root Node (no parent) */
172 if (handle == ACPI_ROOT_OBJECT) {
173 return (AE_NULL_ENTRY);
176 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
177 if (ACPI_FAILURE(status)) {
178 return (status);
181 /* Convert and validate the handle */
183 node = acpi_ns_map_handle_to_node(handle);
184 if (!node) {
185 status = AE_BAD_PARAMETER;
186 goto unlock_and_exit;
189 /* Get the parent entry */
191 *ret_handle =
192 acpi_ns_convert_entry_to_handle(acpi_ns_get_parent_node(node));
194 /* Return exception if parent is null */
196 if (!acpi_ns_get_parent_node(node)) {
197 status = AE_NULL_ENTRY;
200 unlock_and_exit:
202 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
203 return (status);
206 ACPI_EXPORT_SYMBOL(acpi_get_parent)
208 /*******************************************************************************
210 * FUNCTION: acpi_get_next_object
212 * PARAMETERS: Type - Type of object to be searched for
213 * Parent - Parent object whose children we are getting
214 * last_child - Previous child that was found.
215 * The NEXT child will be returned
216 * ret_handle - Where handle to the next object is placed
218 * RETURN: Status
220 * DESCRIPTION: Return the next peer object within the namespace. If Handle is
221 * valid, Scope is ignored. Otherwise, the first object within
222 * Scope is returned.
224 ******************************************************************************/
225 acpi_status
226 acpi_get_next_object(acpi_object_type type,
227 acpi_handle parent,
228 acpi_handle child, acpi_handle * ret_handle)
230 acpi_status status;
231 struct acpi_namespace_node *node;
232 struct acpi_namespace_node *parent_node = NULL;
233 struct acpi_namespace_node *child_node = NULL;
235 /* Parameter validation */
237 if (type > ACPI_TYPE_EXTERNAL_MAX) {
238 return (AE_BAD_PARAMETER);
241 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
242 if (ACPI_FAILURE(status)) {
243 return (status);
246 /* If null handle, use the parent */
248 if (!child) {
250 /* Start search at the beginning of the specified scope */
252 parent_node = acpi_ns_map_handle_to_node(parent);
253 if (!parent_node) {
254 status = AE_BAD_PARAMETER;
255 goto unlock_and_exit;
257 } else {
258 /* Non-null handle, ignore the parent */
259 /* Convert and validate the handle */
261 child_node = acpi_ns_map_handle_to_node(child);
262 if (!child_node) {
263 status = AE_BAD_PARAMETER;
264 goto unlock_and_exit;
268 /* Internal function does the real work */
270 node = acpi_ns_get_next_node(type, parent_node, child_node);
271 if (!node) {
272 status = AE_NOT_FOUND;
273 goto unlock_and_exit;
276 if (ret_handle) {
277 *ret_handle = acpi_ns_convert_entry_to_handle(node);
280 unlock_and_exit:
282 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
283 return (status);
286 ACPI_EXPORT_SYMBOL(acpi_get_next_object)