drivers/acpi/acpica/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 - 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 #define EXPORT_ACPI_INTERFACES
  46
  47 #include <acpi/acpi.h>
  48 #include "accommon.h"
  49 #include "acnamesp.h"
  50
  51 #define _COMPONENT          ACPI_NAMESPACE
  52 ACPI_MODULE_NAME("nsxfobj")
  53
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    acpi_get_id
  57  *
  58  * PARAMETERS:  Handle          - Handle of object whose id is desired
  59  *              ret_id          - Where the id will be placed
  60  *
  61  * RETURN:      Status
  62  *
  63  * DESCRIPTION: This routine returns the owner id associated with a handle
  64  *
  65  ******************************************************************************/
  66 acpi_status acpi_get_id(acpi_handle handle, acpi_owner_id * ret_id)
  67 {
  68         struct acpi_namespace_node *node;
  69         acpi_status status;
  70
  71         /* Parameter Validation */
  72
  73         if (!ret_id) {
  74                 return (AE_BAD_PARAMETER);
  75         }
  76
  77         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
  78         if (ACPI_FAILURE(status)) {
  79                 return (status);
  80         }
  81
  82         /* Convert and validate the handle */
  83
  84         node = acpi_ns_validate_handle(handle);
  85         if (!node) {
  86                 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
  87                 return (AE_BAD_PARAMETER);
  88         }
  89
  90         *ret_id = node->owner_id;
  91
  92         status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
  93         return (status);
  94 }
  95
  96 ACPI_EXPORT_SYMBOL(acpi_get_id)
  97
  98 /*******************************************************************************
  99  *
 100  * FUNCTION:    acpi_get_type
 101  *
 102  * PARAMETERS:  handle          - Handle of object whose type is desired
 103  *              ret_type        - Where the type will be placed
 104  *
 105  * RETURN:      Status
 106  *
 107  * DESCRIPTION: This routine returns the type associatd with a particular handle
 108  *
 109  ******************************************************************************/
 110 acpi_status acpi_get_type(acpi_handle handle, acpi_object_type * ret_type)
 111 {
 112         struct acpi_namespace_node *node;
 113         acpi_status status;
 114
 115         /* Parameter Validation */
 116
 117         if (!ret_type) {
 118                 return (AE_BAD_PARAMETER);
 119         }
 120
 121         /*
 122          * Special case for the predefined Root Node
 123          * (return type ANY)
 124          */
 125         if (handle == ACPI_ROOT_OBJECT) {
 126                 *ret_type = ACPI_TYPE_ANY;
 127                 return (AE_OK);
 128         }
 129
 130         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 131         if (ACPI_FAILURE(status)) {
 132                 return (status);
 133         }
 134
 135         /* Convert and validate the handle */
 136
 137         node = acpi_ns_validate_handle(handle);
 138         if (!node) {
 139                 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 140                 return (AE_BAD_PARAMETER);
 141         }
 142
 143         *ret_type = node->type;
 144
 145         status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 146         return (status);
 147 }
 148
 149 ACPI_EXPORT_SYMBOL(acpi_get_type)
 150
 151 /*******************************************************************************
 152  *
 153  * FUNCTION:    acpi_get_parent
 154  *
 155  * PARAMETERS:  handle          - Handle of object whose parent is desired
 156  *              ret_handle      - Where the parent handle will be placed
 157  *
 158  * RETURN:      Status
 159  *
 160  * DESCRIPTION: Returns a handle to the parent of the object represented by
 161  *              Handle.
 162  *
 163  ******************************************************************************/
 164 acpi_status acpi_get_parent(acpi_handle handle, acpi_handle * ret_handle)
 165 {
 166         struct acpi_namespace_node *node;
 167         struct acpi_namespace_node *parent_node;
 168         acpi_status status;
 169
 170         if (!ret_handle) {
 171                 return (AE_BAD_PARAMETER);
 172         }
 173
 174         /* Special case for the predefined Root Node (no parent) */
 175
 176         if (handle == ACPI_ROOT_OBJECT) {
 177                 return (AE_NULL_ENTRY);
 178         }
 179
 180         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 181         if (ACPI_FAILURE(status)) {
 182                 return (status);
 183         }
 184
 185         /* Convert and validate the handle */
 186
 187         node = acpi_ns_validate_handle(handle);
 188         if (!node) {
 189                 status = AE_BAD_PARAMETER;
 190                 goto unlock_and_exit;
 191         }
 192
 193         /* Get the parent entry */
 194
 195         parent_node = node->parent;
 196         *ret_handle = ACPI_CAST_PTR(acpi_handle, parent_node);
 197
 198         /* Return exception if parent is null */
 199
 200         if (!parent_node) {
 201                 status = AE_NULL_ENTRY;
 202         }
 203
 204 unlock_and_exit:
 205
 206         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 207         return (status);
 208 }
 209
 210 ACPI_EXPORT_SYMBOL(acpi_get_parent)
 211
 212 /*******************************************************************************
 213  *
 214  * FUNCTION:    acpi_get_next_object
 215  *
 216  * PARAMETERS:  type            - Type of object to be searched for
 217  *              parent          - Parent object whose children we are getting
 218  *              last_child      - Previous child that was found.
 219  *                                The NEXT child will be returned
 220  *              ret_handle      - Where handle to the next object is placed
 221  *
 222  * RETURN:      Status
 223  *
 224  * DESCRIPTION: Return the next peer object within the namespace. If Handle is
 225  *              valid, Scope is ignored. Otherwise, the first object within
 226  *              Scope is returned.
 227  *
 228  ******************************************************************************/
 229 acpi_status
 230 acpi_get_next_object(acpi_object_type type,
 231                      acpi_handle parent,
 232                      acpi_handle child, acpi_handle * ret_handle)
 233 {
 234         acpi_status status;
 235         struct acpi_namespace_node *node;
 236         struct acpi_namespace_node *parent_node = NULL;
 237         struct acpi_namespace_node *child_node = NULL;
 238
 239         /* Parameter validation */
 240
 241         if (type > ACPI_TYPE_EXTERNAL_MAX) {
 242                 return (AE_BAD_PARAMETER);
 243         }
 244
 245         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 246         if (ACPI_FAILURE(status)) {
 247                 return (status);
 248         }
 249
 250         /* If null handle, use the parent */
 251
 252         if (!child) {
 253
 254                 /* Start search at the beginning of the specified scope */
 255
 256                 parent_node = acpi_ns_validate_handle(parent);
 257                 if (!parent_node) {
 258                         status = AE_BAD_PARAMETER;
 259                         goto unlock_and_exit;
 260                 }
 261         } else {
 262                 /* Non-null handle, ignore the parent */
 263                 /* Convert and validate the handle */
 264
 265                 child_node = acpi_ns_validate_handle(child);
 266                 if (!child_node) {
 267                         status = AE_BAD_PARAMETER;
 268                         goto unlock_and_exit;
 269                 }
 270         }
 271
 272         /* Internal function does the real work */
 273
 274         node = acpi_ns_get_next_node_typed(type, parent_node, child_node);
 275         if (!node) {
 276                 status = AE_NOT_FOUND;
 277                 goto unlock_and_exit;
 278         }
 279
 280         if (ret_handle) {
 281                 *ret_handle = ACPI_CAST_PTR(acpi_handle, node);
 282         }
 283
 284 unlock_and_exit:
 285
 286         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 287         return (status);
 288 }
 289
 290 ACPI_EXPORT_SYMBOL(acpi_get_next_object)