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 - 2017, 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_type 57 * 58 * PARAMETERS: handle - Handle of object whose type is desired 59 * ret_type - Where the type will be placed 60 * 61 * RETURN: Status 62 * 63 * DESCRIPTION: This routine returns the type associatd with a particular handle 64 * 65 ******************************************************************************/ 66 acpi_status acpi_get_type(acpi_handle handle, acpi_object_type *ret_type) 67 { 68 struct acpi_namespace_node *node; 69 acpi_status status; 70 71 /* Parameter Validation */ 72 73 if (!ret_type) { 74 return (AE_BAD_PARAMETER); 75 } 76 77 /* Special case for the predefined Root Node (return type ANY) */ 78 79 if (handle == ACPI_ROOT_OBJECT) { 80 *ret_type = ACPI_TYPE_ANY; 81 return (AE_OK); 82 } 83 84 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 85 if (ACPI_FAILURE(status)) { 86 return (status); 87 } 88 89 /* Convert and validate the handle */ 90 91 node = acpi_ns_validate_handle(handle); 92 if (!node) { 93 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 94 return (AE_BAD_PARAMETER); 95 } 96 97 *ret_type = node->type; 98 99 status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 100 return (status); 101 } 102 103 ACPI_EXPORT_SYMBOL(acpi_get_type) 104 105 /******************************************************************************* 106 * 107 * FUNCTION: acpi_get_parent 108 * 109 * PARAMETERS: handle - Handle of object whose parent is desired 110 * ret_handle - Where the parent handle will be placed 111 * 112 * RETURN: Status 113 * 114 * DESCRIPTION: Returns a handle to the parent of the object represented by 115 * Handle. 116 * 117 ******************************************************************************/ 118 acpi_status acpi_get_parent(acpi_handle handle, acpi_handle *ret_handle) 119 { 120 struct acpi_namespace_node *node; 121 struct acpi_namespace_node *parent_node; 122 acpi_status status; 123 124 if (!ret_handle) { 125 return (AE_BAD_PARAMETER); 126 } 127 128 /* Special case for the predefined Root Node (no parent) */ 129 130 if (handle == ACPI_ROOT_OBJECT) { 131 return (AE_NULL_ENTRY); 132 } 133 134 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 135 if (ACPI_FAILURE(status)) { 136 return (status); 137 } 138 139 /* Convert and validate the handle */ 140 141 node = acpi_ns_validate_handle(handle); 142 if (!node) { 143 status = AE_BAD_PARAMETER; 144 goto unlock_and_exit; 145 } 146 147 /* Get the parent entry */ 148 149 parent_node = node->parent; 150 *ret_handle = ACPI_CAST_PTR(acpi_handle, parent_node); 151 152 /* Return exception if parent is null */ 153 154 if (!parent_node) { 155 status = AE_NULL_ENTRY; 156 } 157 158 unlock_and_exit: 159 160 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 161 return (status); 162 } 163 164 ACPI_EXPORT_SYMBOL(acpi_get_parent) 165 166 /******************************************************************************* 167 * 168 * FUNCTION: acpi_get_next_object 169 * 170 * PARAMETERS: type - Type of object to be searched for 171 * parent - Parent object whose children we are getting 172 * last_child - Previous child that was found. 173 * The NEXT child will be returned 174 * ret_handle - Where handle to the next object is placed 175 * 176 * RETURN: Status 177 * 178 * DESCRIPTION: Return the next peer object within the namespace. If Handle is 179 * valid, Scope is ignored. Otherwise, the first object within 180 * Scope is returned. 181 * 182 ******************************************************************************/ 183 acpi_status 184 acpi_get_next_object(acpi_object_type type, 185 acpi_handle parent, 186 acpi_handle child, acpi_handle *ret_handle) 187 { 188 acpi_status status; 189 struct acpi_namespace_node *node; 190 struct acpi_namespace_node *parent_node = NULL; 191 struct acpi_namespace_node *child_node = NULL; 192 193 /* Parameter validation */ 194 195 if (type > ACPI_TYPE_EXTERNAL_MAX) { 196 return (AE_BAD_PARAMETER); 197 } 198 199 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 200 if (ACPI_FAILURE(status)) { 201 return (status); 202 } 203 204 /* If null handle, use the parent */ 205 206 if (!child) { 207 208 /* Start search at the beginning of the specified scope */ 209 210 parent_node = acpi_ns_validate_handle(parent); 211 if (!parent_node) { 212 status = AE_BAD_PARAMETER; 213 goto unlock_and_exit; 214 } 215 } else { 216 /* Non-null handle, ignore the parent */ 217 /* Convert and validate the handle */ 218 219 child_node = acpi_ns_validate_handle(child); 220 if (!child_node) { 221 status = AE_BAD_PARAMETER; 222 goto unlock_and_exit; 223 } 224 } 225 226 /* Internal function does the real work */ 227 228 node = acpi_ns_get_next_node_typed(type, parent_node, child_node); 229 if (!node) { 230 status = AE_NOT_FOUND; 231 goto unlock_and_exit; 232 } 233 234 if (ret_handle) { 235 *ret_handle = ACPI_CAST_PTR(acpi_handle, node); 236 } 237 238 unlock_and_exit: 239 240 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 241 return (status); 242 } 243 244 ACPI_EXPORT_SYMBOL(acpi_get_next_object) 245