ACPICA: Update all ACPICA copyrights and signons to 2010
[linux-2.6.git] / drivers / acpi / acpica / exresnte.c
1
2 /******************************************************************************
3  *
4  * Module Name: exresnte - AML Interpreter object resolution
5  *
6  *****************************************************************************/
7
8 /*
9  * Copyright (C) 2000 - 2010, 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 #include <acpi/acpi.h>
46 #include "accommon.h"
47 #include "acdispat.h"
48 #include "acinterp.h"
49 #include "acnamesp.h"
50
51 #define _COMPONENT          ACPI_EXECUTER
52 ACPI_MODULE_NAME("exresnte")
53
54 /*******************************************************************************
55  *
56  * FUNCTION:    acpi_ex_resolve_node_to_value
57  *
58  * PARAMETERS:  object_ptr      - Pointer to a location that contains
59  *                                a pointer to a NS node, and will receive a
60  *                                pointer to the resolved object.
61  *              walk_state      - Current state.  Valid only if executing AML
62  *                                code.  NULL if simply resolving an object
63  *
64  * RETURN:      Status
65  *
66  * DESCRIPTION: Resolve a Namespace node to a valued object
67  *
68  * Note: for some of the data types, the pointer attached to the Node
69  * can be either a pointer to an actual internal object or a pointer into the
70  * AML stream itself.  These types are currently:
71  *
72  *      ACPI_TYPE_INTEGER
73  *      ACPI_TYPE_STRING
74  *      ACPI_TYPE_BUFFER
75  *      ACPI_TYPE_MUTEX
76  *      ACPI_TYPE_PACKAGE
77  *
78  ******************************************************************************/
79 acpi_status
80 acpi_ex_resolve_node_to_value(struct acpi_namespace_node **object_ptr,
81                               struct acpi_walk_state *walk_state)
82 {
83         acpi_status status = AE_OK;
84         union acpi_operand_object *source_desc;
85         union acpi_operand_object *obj_desc = NULL;
86         struct acpi_namespace_node *node;
87         acpi_object_type entry_type;
88
89         ACPI_FUNCTION_TRACE(ex_resolve_node_to_value);
90
91         /*
92          * The stack pointer points to a struct acpi_namespace_node (Node).  Get the
93          * object that is attached to the Node.
94          */
95         node = *object_ptr;
96         source_desc = acpi_ns_get_attached_object(node);
97         entry_type = acpi_ns_get_type((acpi_handle) node);
98
99         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Entry=%p SourceDesc=%p [%s]\n",
100                           node, source_desc,
101                           acpi_ut_get_type_name(entry_type)));
102
103         if ((entry_type == ACPI_TYPE_LOCAL_ALIAS) ||
104             (entry_type == ACPI_TYPE_LOCAL_METHOD_ALIAS)) {
105
106                 /* There is always exactly one level of indirection */
107
108                 node = ACPI_CAST_PTR(struct acpi_namespace_node, node->object);
109                 source_desc = acpi_ns_get_attached_object(node);
110                 entry_type = acpi_ns_get_type((acpi_handle) node);
111                 *object_ptr = node;
112         }
113
114         /*
115          * Several object types require no further processing:
116          * 1) Device/Thermal objects don't have a "real" subobject, return the Node
117          * 2) Method locals and arguments have a pseudo-Node
118          * 3) 10/2007: Added method type to assist with Package construction.
119          */
120         if ((entry_type == ACPI_TYPE_DEVICE) ||
121             (entry_type == ACPI_TYPE_THERMAL) ||
122             (entry_type == ACPI_TYPE_METHOD) ||
123             (node->flags & (ANOBJ_METHOD_ARG | ANOBJ_METHOD_LOCAL))) {
124                 return_ACPI_STATUS(AE_OK);
125         }
126
127         if (!source_desc) {
128                 ACPI_ERROR((AE_INFO, "No object attached to node %p", node));
129                 return_ACPI_STATUS(AE_AML_NO_OPERAND);
130         }
131
132         /*
133          * Action is based on the type of the Node, which indicates the type
134          * of the attached object or pointer
135          */
136         switch (entry_type) {
137         case ACPI_TYPE_PACKAGE:
138
139                 if (source_desc->common.type != ACPI_TYPE_PACKAGE) {
140                         ACPI_ERROR((AE_INFO, "Object not a Package, type %s",
141                                     acpi_ut_get_object_type_name(source_desc)));
142                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
143                 }
144
145                 status = acpi_ds_get_package_arguments(source_desc);
146                 if (ACPI_SUCCESS(status)) {
147
148                         /* Return an additional reference to the object */
149
150                         obj_desc = source_desc;
151                         acpi_ut_add_reference(obj_desc);
152                 }
153                 break;
154
155         case ACPI_TYPE_BUFFER:
156
157                 if (source_desc->common.type != ACPI_TYPE_BUFFER) {
158                         ACPI_ERROR((AE_INFO, "Object not a Buffer, type %s",
159                                     acpi_ut_get_object_type_name(source_desc)));
160                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
161                 }
162
163                 status = acpi_ds_get_buffer_arguments(source_desc);
164                 if (ACPI_SUCCESS(status)) {
165
166                         /* Return an additional reference to the object */
167
168                         obj_desc = source_desc;
169                         acpi_ut_add_reference(obj_desc);
170                 }
171                 break;
172
173         case ACPI_TYPE_STRING:
174
175                 if (source_desc->common.type != ACPI_TYPE_STRING) {
176                         ACPI_ERROR((AE_INFO, "Object not a String, type %s",
177                                     acpi_ut_get_object_type_name(source_desc)));
178                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
179                 }
180
181                 /* Return an additional reference to the object */
182
183                 obj_desc = source_desc;
184                 acpi_ut_add_reference(obj_desc);
185                 break;
186
187         case ACPI_TYPE_INTEGER:
188
189                 if (source_desc->common.type != ACPI_TYPE_INTEGER) {
190                         ACPI_ERROR((AE_INFO, "Object not a Integer, type %s",
191                                     acpi_ut_get_object_type_name(source_desc)));
192                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
193                 }
194
195                 /* Return an additional reference to the object */
196
197                 obj_desc = source_desc;
198                 acpi_ut_add_reference(obj_desc);
199                 break;
200
201         case ACPI_TYPE_BUFFER_FIELD:
202         case ACPI_TYPE_LOCAL_REGION_FIELD:
203         case ACPI_TYPE_LOCAL_BANK_FIELD:
204         case ACPI_TYPE_LOCAL_INDEX_FIELD:
205
206                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
207                                   "FieldRead Node=%p SourceDesc=%p Type=%X\n",
208                                   node, source_desc, entry_type));
209
210                 status =
211                     acpi_ex_read_data_from_field(walk_state, source_desc,
212                                                  &obj_desc);
213                 break;
214
215                 /* For these objects, just return the object attached to the Node */
216
217         case ACPI_TYPE_MUTEX:
218         case ACPI_TYPE_POWER:
219         case ACPI_TYPE_PROCESSOR:
220         case ACPI_TYPE_EVENT:
221         case ACPI_TYPE_REGION:
222
223                 /* Return an additional reference to the object */
224
225                 obj_desc = source_desc;
226                 acpi_ut_add_reference(obj_desc);
227                 break;
228
229                 /* TYPE_ANY is untyped, and thus there is no object associated with it */
230
231         case ACPI_TYPE_ANY:
232
233                 ACPI_ERROR((AE_INFO,
234                             "Untyped entry %p, no attached object!", node));
235
236                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);        /* Cannot be AE_TYPE */
237
238         case ACPI_TYPE_LOCAL_REFERENCE:
239
240                 switch (source_desc->reference.class) {
241                 case ACPI_REFCLASS_TABLE:       /* This is a ddb_handle */
242                 case ACPI_REFCLASS_REFOF:
243                 case ACPI_REFCLASS_INDEX:
244
245                         /* Return an additional reference to the object */
246
247                         obj_desc = source_desc;
248                         acpi_ut_add_reference(obj_desc);
249                         break;
250
251                 default:
252                         /* No named references are allowed here */
253
254                         ACPI_ERROR((AE_INFO,
255                                     "Unsupported Reference type %X",
256                                     source_desc->reference.class));
257
258                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
259                 }
260                 break;
261
262         default:
263
264                 /* Default case is for unknown types */
265
266                 ACPI_ERROR((AE_INFO,
267                             "Node %p - Unknown object type %X",
268                             node, entry_type));
269
270                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
271
272         }                       /* switch (entry_type) */
273
274         /* Return the object descriptor */
275
276         *object_ptr = (void *)obj_desc;
277         return_ACPI_STATUS(status);
278 }