1 /*******************************************************************************
2 *
3 * Module Name: nsxfobj - Public interfaces to the ACPI subsystem
4 * ACPI Object oriented interfaces
5 *
6 ******************************************************************************/
7
8 /*
9 * Copyright (C) 2000 - 2013, Intel Corp.
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
45
46 #define __NSXFOBJ_C__
47 #define EXPORT_ACPI_INTERFACES
48
49 #include "acpi.h"
50 #include "accommon.h"
51 #include "acnamesp.h"
52
53
54 #define _COMPONENT ACPI_NAMESPACE
55 ACPI_MODULE_NAME ("nsxfobj")
56
57 /*******************************************************************************
58 *
59 * FUNCTION: AcpiGetType
60 *
61 * PARAMETERS: Handle - Handle of object whose type is desired
62 * RetType - Where the type will be placed
63 *
64 * RETURN: Status
65 *
66 * DESCRIPTION: This routine returns the type associatd with a particular handle
67 *
68 ******************************************************************************/
69
70 ACPI_STATUS
71 AcpiGetType (
72 ACPI_HANDLE Handle,
73 ACPI_OBJECT_TYPE *RetType)
74 {
75 ACPI_NAMESPACE_NODE *Node;
76 ACPI_STATUS Status;
77
78
79 /* Parameter Validation */
80
81 if (!RetType)
82 {
83 return (AE_BAD_PARAMETER);
84 }
85
86 /*
87 * Special case for the predefined Root Node
88 * (return type ANY)
89 */
90 if (Handle == ACPI_ROOT_OBJECT)
91 {
92 *RetType = ACPI_TYPE_ANY;
93 return (AE_OK);
94 }
95
96 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
97 if (ACPI_FAILURE (Status))
98 {
99 return (Status);
100 }
101
102 /* Convert and validate the handle */
103
104 Node = AcpiNsValidateHandle (Handle);
105 if (!Node)
106 {
107 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
108 return (AE_BAD_PARAMETER);
109 }
110
111 *RetType = Node->Type;
112
113
114 Status = AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
115 return (Status);
116 }
117
118 ACPI_EXPORT_SYMBOL (AcpiGetType)
119
120
121 /*******************************************************************************
122 *
123 * FUNCTION: AcpiGetParent
124 *
125 * PARAMETERS: Handle - Handle of object whose parent is desired
126 * RetHandle - Where the parent handle will be placed
127 *
128 * RETURN: Status
129 *
130 * DESCRIPTION: Returns a handle to the parent of the object represented by
131 * Handle.
132 *
133 ******************************************************************************/
134
135 ACPI_STATUS
136 AcpiGetParent (
137 ACPI_HANDLE Handle,
138 ACPI_HANDLE *RetHandle)
139 {
140 ACPI_NAMESPACE_NODE *Node;
141 ACPI_NAMESPACE_NODE *ParentNode;
142 ACPI_STATUS Status;
143
144
145 if (!RetHandle)
146 {
147 return (AE_BAD_PARAMETER);
148 }
149
150 /* Special case for the predefined Root Node (no parent) */
151
152 if (Handle == ACPI_ROOT_OBJECT)
153 {
154 return (AE_NULL_ENTRY);
155 }
156
157 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
158 if (ACPI_FAILURE (Status))
159 {
160 return (Status);
161 }
162
163 /* Convert and validate the handle */
164
165 Node = AcpiNsValidateHandle (Handle);
166 if (!Node)
167 {
168 Status = AE_BAD_PARAMETER;
169 goto UnlockAndExit;
170 }
171
172 /* Get the parent entry */
173
174 ParentNode = Node->Parent;
175 *RetHandle = ACPI_CAST_PTR (ACPI_HANDLE, ParentNode);
176
177 /* Return exception if parent is null */
178
179 if (!ParentNode)
180 {
181 Status = AE_NULL_ENTRY;
182 }
183
184
185 UnlockAndExit:
186
187 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
188 return (Status);
189 }
190
191 ACPI_EXPORT_SYMBOL (AcpiGetParent)
192
193
194 /*******************************************************************************
195 *
196 * FUNCTION: AcpiGetNextObject
197 *
198 * PARAMETERS: Type - Type of object to be searched for
199 * Parent - Parent object whose children we are getting
200 * LastChild - Previous child that was found.
201 * The NEXT child will be returned
202 * RetHandle - Where handle to the next object is placed
203 *
204 * RETURN: Status
205 *
206 * DESCRIPTION: Return the next peer object within the namespace. If Handle is
207 * valid, Scope is ignored. Otherwise, the first object within
208 * Scope is returned.
209 *
210 ******************************************************************************/
211
212 ACPI_STATUS
213 AcpiGetNextObject (
214 ACPI_OBJECT_TYPE Type,
215 ACPI_HANDLE Parent,
216 ACPI_HANDLE Child,
217 ACPI_HANDLE *RetHandle)
218 {
219 ACPI_STATUS Status;
220 ACPI_NAMESPACE_NODE *Node;
221 ACPI_NAMESPACE_NODE *ParentNode = NULL;
222 ACPI_NAMESPACE_NODE *ChildNode = NULL;
223
224
225 /* Parameter validation */
226
227 if (Type > ACPI_TYPE_EXTERNAL_MAX)
228 {
229 return (AE_BAD_PARAMETER);
230 }
231
232 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
233 if (ACPI_FAILURE (Status))
234 {
235 return (Status);
236 }
237
238 /* If null handle, use the parent */
239
240 if (!Child)
241 {
242 /* Start search at the beginning of the specified scope */
243
244 ParentNode = AcpiNsValidateHandle (Parent);
245 if (!ParentNode)
246 {
247 Status = AE_BAD_PARAMETER;
248 goto UnlockAndExit;
249 }
250 }
251 else
252 {
253 /* Non-null handle, ignore the parent */
254 /* Convert and validate the handle */
255
256 ChildNode = AcpiNsValidateHandle (Child);
257 if (!ChildNode)
258 {
259 Status = AE_BAD_PARAMETER;
260 goto UnlockAndExit;
261 }
262 }
263
264 /* Internal function does the real work */
265
266 Node = AcpiNsGetNextNodeTyped (Type, ParentNode, ChildNode);
267 if (!Node)
268 {
269 Status = AE_NOT_FOUND;
270 goto UnlockAndExit;
271 }
272
273 if (RetHandle)
274 {
275 *RetHandle = ACPI_CAST_PTR (ACPI_HANDLE, Node);
276 }
277
278
279 UnlockAndExit:
280
281 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
282 return (Status);
283 }
284
285 ACPI_EXPORT_SYMBOL (AcpiGetNextObject)