Merge git://git.infradead.org/battery-2.6
[linux-2.6] / drivers / acpi / dispatcher / dswscope.c
1 /******************************************************************************
2  *
3  * Module Name: dswscope - Scope stack manipulation
4  *
5  *****************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2008, Intel Corp.
9  * All rights reserved.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions, and the following disclaimer,
16  *    without modification.
17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18  *    substantially similar to the "NO WARRANTY" disclaimer below
19  *    ("Disclaimer") and any redistribution must be conditioned upon
20  *    including a substantially similar Disclaimer requirement for further
21  *    binary redistribution.
22  * 3. Neither the names of the above-listed copyright holders nor the names
23  *    of any contributors may be used to endorse or promote products derived
24  *    from this software without specific prior written permission.
25  *
26  * Alternatively, this software may be distributed under the terms of the
27  * GNU General Public License ("GPL") version 2 as published by the Free
28  * Software Foundation.
29  *
30  * NO WARRANTY
31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41  * POSSIBILITY OF SUCH DAMAGES.
42  */
43
44 #include <acpi/acpi.h>
45 #include <acpi/acdispat.h>
46
47 #define _COMPONENT          ACPI_DISPATCHER
48 ACPI_MODULE_NAME("dswscope")
49
50 /****************************************************************************
51  *
52  * FUNCTION:    acpi_ds_scope_stack_clear
53  *
54  * PARAMETERS:  walk_state      - Current state
55  *
56  * RETURN:      None
57  *
58  * DESCRIPTION: Pop (and free) everything on the scope stack except the
59  *              root scope object (which remains at the stack top.)
60  *
61  ***************************************************************************/
62 void acpi_ds_scope_stack_clear(struct acpi_walk_state *walk_state)
63 {
64         union acpi_generic_state *scope_info;
65
66         ACPI_FUNCTION_NAME(ds_scope_stack_clear);
67
68         while (walk_state->scope_info) {
69
70                 /* Pop a scope off the stack */
71
72                 scope_info = walk_state->scope_info;
73                 walk_state->scope_info = scope_info->scope.next;
74
75                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
76                                   "Popped object type (%s)\n",
77                                   acpi_ut_get_type_name(scope_info->common.
78                                                         value)));
79                 acpi_ut_delete_generic_state(scope_info);
80         }
81 }
82
83 /****************************************************************************
84  *
85  * FUNCTION:    acpi_ds_scope_stack_push
86  *
87  * PARAMETERS:  Node            - Name to be made current
88  *              Type            - Type of frame being pushed
89  *              walk_state      - Current state
90  *
91  * RETURN:      Status
92  *
93  * DESCRIPTION: Push the current scope on the scope stack, and make the
94  *              passed Node current.
95  *
96  ***************************************************************************/
97
98 acpi_status
99 acpi_ds_scope_stack_push(struct acpi_namespace_node *node,
100                          acpi_object_type type,
101                          struct acpi_walk_state *walk_state)
102 {
103         union acpi_generic_state *scope_info;
104         union acpi_generic_state *old_scope_info;
105
106         ACPI_FUNCTION_TRACE(ds_scope_stack_push);
107
108         if (!node) {
109
110                 /* Invalid scope   */
111
112                 ACPI_ERROR((AE_INFO, "Null scope parameter"));
113                 return_ACPI_STATUS(AE_BAD_PARAMETER);
114         }
115
116         /* Make sure object type is valid */
117
118         if (!acpi_ut_valid_object_type(type)) {
119                 ACPI_WARNING((AE_INFO, "Invalid object type: 0x%X", type));
120         }
121
122         /* Allocate a new scope object */
123
124         scope_info = acpi_ut_create_generic_state();
125         if (!scope_info) {
126                 return_ACPI_STATUS(AE_NO_MEMORY);
127         }
128
129         /* Init new scope object */
130
131         scope_info->common.descriptor_type = ACPI_DESC_TYPE_STATE_WSCOPE;
132         scope_info->scope.node = node;
133         scope_info->common.value = (u16) type;
134
135         walk_state->scope_depth++;
136
137         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
138                           "[%.2d] Pushed scope ",
139                           (u32) walk_state->scope_depth));
140
141         old_scope_info = walk_state->scope_info;
142         if (old_scope_info) {
143                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC,
144                                       "[%4.4s] (%s)",
145                                       acpi_ut_get_node_name(old_scope_info->
146                                                             scope.node),
147                                       acpi_ut_get_type_name(old_scope_info->
148                                                             common.value)));
149         } else {
150                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, "[\\___] (%s)", "ROOT"));
151         }
152
153         ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC,
154                               ", New scope -> [%4.4s] (%s)\n",
155                               acpi_ut_get_node_name(scope_info->scope.node),
156                               acpi_ut_get_type_name(scope_info->common.value)));
157
158         /* Push new scope object onto stack */
159
160         acpi_ut_push_generic_state(&walk_state->scope_info, scope_info);
161         return_ACPI_STATUS(AE_OK);
162 }
163
164 /****************************************************************************
165  *
166  * FUNCTION:    acpi_ds_scope_stack_pop
167  *
168  * PARAMETERS:  walk_state      - Current state
169  *
170  * RETURN:      Status
171  *
172  * DESCRIPTION: Pop the scope stack once.
173  *
174  ***************************************************************************/
175
176 acpi_status acpi_ds_scope_stack_pop(struct acpi_walk_state *walk_state)
177 {
178         union acpi_generic_state *scope_info;
179         union acpi_generic_state *new_scope_info;
180
181         ACPI_FUNCTION_TRACE(ds_scope_stack_pop);
182
183         /*
184          * Pop scope info object off the stack.
185          */
186         scope_info = acpi_ut_pop_generic_state(&walk_state->scope_info);
187         if (!scope_info) {
188                 return_ACPI_STATUS(AE_STACK_UNDERFLOW);
189         }
190
191         walk_state->scope_depth--;
192
193         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
194                           "[%.2d] Popped scope [%4.4s] (%s), New scope -> ",
195                           (u32) walk_state->scope_depth,
196                           acpi_ut_get_node_name(scope_info->scope.node),
197                           acpi_ut_get_type_name(scope_info->common.value)));
198
199         new_scope_info = walk_state->scope_info;
200         if (new_scope_info) {
201                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC,
202                                       "[%4.4s] (%s)\n",
203                                       acpi_ut_get_node_name(new_scope_info->
204                                                             scope.node),
205                                       acpi_ut_get_type_name(new_scope_info->
206                                                             common.value)));
207         } else {
208                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, "[\\___] (ROOT)\n"));
209         }
210
211         acpi_ut_delete_generic_state(scope_info);
212         return_ACPI_STATUS(AE_OK);
213 }