drivers/acpi/namespace/nsxfobj.c

   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 - 2007, R. Byron Moore
  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 <acpi/acnamesp.h>
  47
  48 #define _COMPONENT          ACPI_NAMESPACE
  49 ACPI_MODULE_NAME("nsxfobj")
  50
  51 /*******************************************************************************
  52  *
  53  * FUNCTION:    acpi_get_id
  54  *
  55  * PARAMETERS:  Handle          - Handle of object whose id is desired
  56  *              ret_id          - Where the id will be placed
  57  *
  58  * RETURN:      Status
  59  *
  60  * DESCRIPTION: This routine returns the owner id associated with a handle
  61  *
  62  ******************************************************************************/
  63 acpi_status acpi_get_id(acpi_handle handle, acpi_owner_id * ret_id)
  64 {
  65         struct acpi_namespace_node *node;
  66         acpi_status status;
  67
  68         /* Parameter Validation */
  69
  70         if (!ret_id) {
  71                 return (AE_BAD_PARAMETER);
  72         }
  73
  74         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
  75         if (ACPI_FAILURE(status)) {
  76                 return (status);
  77         }
  78
  79         /* Convert and validate the handle */
  80
  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);
  85         }
  86
  87         *ret_id = node->owner_id;
  88
  89         status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
  90         return (status);
  91 }
  92
  93 ACPI_EXPORT_SYMBOL(acpi_get_id)
  94
  95 /*******************************************************************************
  96  *
  97  * FUNCTION:    acpi_get_type
  98  *
  99  * PARAMETERS:  Handle          - Handle of object whose type is desired
 100  *              ret_type        - Where the type will be placed
 101  *
 102  * RETURN:      Status
 103  *
 104  * DESCRIPTION: This routine returns the type associatd with a particular handle
 105  *
 106  ******************************************************************************/
 107 acpi_status acpi_get_type(acpi_handle handle, acpi_object_type * ret_type)
 108 {
 109         struct acpi_namespace_node *node;
 110         acpi_status status;
 111
 112         /* Parameter Validation */
 113
 114         if (!ret_type) {
 115                 return (AE_BAD_PARAMETER);
 116         }
 117
 118         /*
 119          * Special case for the predefined Root Node
 120          * (return type ANY)
 121          */
 122         if (handle == ACPI_ROOT_OBJECT) {
 123                 *ret_type = ACPI_TYPE_ANY;
 124                 return (AE_OK);
 125         }
 126
 127         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 128         if (ACPI_FAILURE(status)) {
 129                 return (status);
 130         }
 131
 132         /* Convert and validate the handle */
 133
 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);
 138         }
 139
 140         *ret_type = node->type;
 141
 142         status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 143         return (status);
 144 }
 145
 146 ACPI_EXPORT_SYMBOL(acpi_get_type)
 147
 148 /*******************************************************************************
 149  *
 150  * FUNCTION:    acpi_get_parent
 151  *
 152  * PARAMETERS:  Handle          - Handle of object whose parent is desired
 153  *              ret_handle      - Where the parent handle will be placed
 154  *
 155  * RETURN:      Status
 156  *
 157  * DESCRIPTION: Returns a handle to the parent of the object represented by
 158  *              Handle.
 159  *
 160  ******************************************************************************/
 161 acpi_status acpi_get_parent(acpi_handle handle, acpi_handle * ret_handle)
 162 {
 163         struct acpi_namespace_node *node;
 164         acpi_status status;
 165
 166         if (!ret_handle) {
 167                 return (AE_BAD_PARAMETER);
 168         }
 169
 170         /* Special case for the predefined Root Node (no parent) */
 171
 172         if (handle == ACPI_ROOT_OBJECT) {
 173                 return (AE_NULL_ENTRY);
 174         }
 175
 176         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 177         if (ACPI_FAILURE(status)) {
 178                 return (status);
 179         }
 180
 181         /* Convert and validate the handle */
 182
 183         node = acpi_ns_map_handle_to_node(handle);
 184         if (!node) {
 185                 status = AE_BAD_PARAMETER;
 186                 goto unlock_and_exit;
 187         }
 188
 189         /* Get the parent entry */
 190
 191         *ret_handle =
 192             acpi_ns_convert_entry_to_handle(acpi_ns_get_parent_node(node));
 193
 194         /* Return exception if parent is null */
 195
 196         if (!acpi_ns_get_parent_node(node)) {
 197                 status = AE_NULL_ENTRY;
 198         }
 199
 200       unlock_and_exit:
 201
 202         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 203         return (status);
 204 }
 205
 206 ACPI_EXPORT_SYMBOL(acpi_get_parent)
 207
 208 /*******************************************************************************
 209  *
 210  * FUNCTION:    acpi_get_next_object
 211  *
 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
 217  *
 218  * RETURN:      Status
 219  *
 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.
 223  *
 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)
 229 {
 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;
 234
 235         /* Parameter validation */
 236
 237         if (type > ACPI_TYPE_EXTERNAL_MAX) {
 238                 return (AE_BAD_PARAMETER);
 239         }
 240
 241         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 242         if (ACPI_FAILURE(status)) {
 243                 return (status);
 244         }
 245
 246         /* If null handle, use the parent */
 247
 248         if (!child) {
 249
 250                 /* Start search at the beginning of the specified scope */
 251
 252                 parent_node = acpi_ns_map_handle_to_node(parent);
 253                 if (!parent_node) {
 254                         status = AE_BAD_PARAMETER;
 255                         goto unlock_and_exit;
 256                 }
 257         } else {
 258                 /* Non-null handle, ignore the parent */
 259                 /* Convert and validate the handle */
 260
 261                 child_node = acpi_ns_map_handle_to_node(child);
 262                 if (!child_node) {
 263                         status = AE_BAD_PARAMETER;
 264                         goto unlock_and_exit;
 265                 }
 266         }
 267
 268         /* Internal function does the real work */
 269
 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;
 274         }
 275
 276         if (ret_handle) {
 277                 *ret_handle = acpi_ns_convert_entry_to_handle(node);
 278         }
 279
 280       unlock_and_exit:
 281
 282         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 283         return (status);
 284 }
 285
 286 ACPI_EXPORT_SYMBOL(acpi_get_next_object)