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 - 2004, 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
  46 #include <acpi/acpi.h>
  47 #include <acpi/acnamesp.h>
  48
  49
  50 #define _COMPONENT          ACPI_NAMESPACE
  51          ACPI_MODULE_NAME    ("nsxfobj")
  52
  53 /*******************************************************************************
  54  *
  55  * FUNCTION:    acpi_get_type
  56  *
  57  * PARAMETERS:  Handle          - Handle of object whose type is desired
  58  *              *ret_type       - Where the type will be placed
  59  *
  60  * RETURN:      Status
  61  *
  62  * DESCRIPTION: This routine returns the type associatd with a particular handle
  63  *
  64  ******************************************************************************/
  65
  66 acpi_status
  67 acpi_get_type (
  68         acpi_handle                     handle,
  69         acpi_object_type                *ret_type)
  70 {
  71         struct acpi_namespace_node      *node;
  72         acpi_status                     status;
  73
  74
  75         /* Parameter Validation */
  76
  77         if (!ret_type) {
  78                 return (AE_BAD_PARAMETER);
  79         }
  80
  81         /*
  82          * Special case for the predefined Root Node
  83          * (return type ANY)
  84          */
  85         if (handle == ACPI_ROOT_OBJECT) {
  86                 *ret_type = ACPI_TYPE_ANY;
  87                 return (AE_OK);
  88         }
  89
  90         status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
  91         if (ACPI_FAILURE (status)) {
  92                 return (status);
  93         }
  94
  95         /* Convert and validate the handle */
  96
  97         node = acpi_ns_map_handle_to_node (handle);
  98         if (!node) {
  99                 (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 100                 return (AE_BAD_PARAMETER);
 101         }
 102
 103         *ret_type = node->type;
 104
 105
 106         status = acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 107         return (status);
 108 }
 109
 110
 111 /*******************************************************************************
 112  *
 113  * FUNCTION:    acpi_get_parent
 114  *
 115  * PARAMETERS:  Handle          - Handle of object whose parent is desired
 116  *              ret_handle      - Where the parent handle will be placed
 117  *
 118  * RETURN:      Status
 119  *
 120  * DESCRIPTION: Returns a handle to the parent of the object represented by
 121  *              Handle.
 122  *
 123  ******************************************************************************/
 124
 125 acpi_status
 126 acpi_get_parent (
 127         acpi_handle                     handle,
 128         acpi_handle                     *ret_handle)
 129 {
 130         struct acpi_namespace_node      *node;
 131         acpi_status                     status;
 132
 133
 134         if (!ret_handle) {
 135                 return (AE_BAD_PARAMETER);
 136         }
 137
 138         /* Special case for the predefined Root Node (no parent) */
 139
 140         if (handle == ACPI_ROOT_OBJECT) {
 141                 return (AE_NULL_ENTRY);
 142         }
 143
 144         status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
 145         if (ACPI_FAILURE (status)) {
 146                 return (status);
 147         }
 148
 149         /* Convert and validate the handle */
 150
 151         node = acpi_ns_map_handle_to_node (handle);
 152         if (!node) {
 153                 status = AE_BAD_PARAMETER;
 154                 goto unlock_and_exit;
 155         }
 156
 157         /* Get the parent entry */
 158
 159         *ret_handle =
 160                 acpi_ns_convert_entry_to_handle (acpi_ns_get_parent_node (node));
 161
 162         /* Return exception if parent is null */
 163
 164         if (!acpi_ns_get_parent_node (node)) {
 165                 status = AE_NULL_ENTRY;
 166         }
 167
 168
 169 unlock_and_exit:
 170
 171         (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 172         return (status);
 173 }
 174
 175
 176 /*******************************************************************************
 177  *
 178  * FUNCTION:    acpi_get_next_object
 179  *
 180  * PARAMETERS:  Type            - Type of object to be searched for
 181  *              Parent          - Parent object whose children we are getting
 182  *              last_child      - Previous child that was found.
 183  *                                The NEXT child will be returned
 184  *              ret_handle      - Where handle to the next object is placed
 185  *
 186  * RETURN:      Status
 187  *
 188  * DESCRIPTION: Return the next peer object within the namespace.  If Handle is
 189  *              valid, Scope is ignored.  Otherwise, the first object within
 190  *              Scope is returned.
 191  *
 192  ******************************************************************************/
 193
 194 acpi_status
 195 acpi_get_next_object (
 196         acpi_object_type                type,
 197         acpi_handle                     parent,
 198         acpi_handle                     child,
 199         acpi_handle                     *ret_handle)
 200 {
 201         acpi_status                     status;
 202         struct acpi_namespace_node      *node;
 203         struct acpi_namespace_node      *parent_node = NULL;
 204         struct acpi_namespace_node      *child_node = NULL;
 205
 206
 207         /* Parameter validation */
 208
 209         if (type > ACPI_TYPE_EXTERNAL_MAX) {
 210                 return (AE_BAD_PARAMETER);
 211         }
 212
 213         status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
 214         if (ACPI_FAILURE (status)) {
 215                 return (status);
 216         }
 217
 218         /* If null handle, use the parent */
 219
 220         if (!child) {
 221                 /* Start search at the beginning of the specified scope */
 222
 223                 parent_node = acpi_ns_map_handle_to_node (parent);
 224                 if (!parent_node) {
 225                         status = AE_BAD_PARAMETER;
 226                         goto unlock_and_exit;
 227                 }
 228         }
 229         else {
 230                 /* Non-null handle, ignore the parent */
 231                 /* Convert and validate the handle */
 232
 233                 child_node = acpi_ns_map_handle_to_node (child);
 234                 if (!child_node) {
 235                         status = AE_BAD_PARAMETER;
 236                         goto unlock_and_exit;
 237                 }
 238         }
 239
 240         /* Internal function does the real work */
 241
 242         node = acpi_ns_get_next_node (type, parent_node, child_node);
 243         if (!node) {
 244                 status = AE_NOT_FOUND;
 245                 goto unlock_and_exit;
 246         }
 247
 248         if (ret_handle) {
 249                 *ret_handle = acpi_ns_convert_entry_to_handle (node);
 250         }
 251
 252
 253 unlock_and_exit:
 254
 255         (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 256         return (status);
 257 }
 258
 259