246 lines
7.0 KiB
C
246 lines
7.0 KiB
C
/*******************************************************************************
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*
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* Module Name: nsxfobj - Public interfaces to the ACPI subsystem
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* ACPI Object oriented interfaces
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*
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******************************************************************************/
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/*
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* Copyright (C) 2000 - 2005, R. Byron Moore
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <linux/module.h>
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#include <acpi/acpi.h>
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#include <acpi/acnamesp.h>
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#define _COMPONENT ACPI_NAMESPACE
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ACPI_MODULE_NAME("nsxfobj")
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/*******************************************************************************
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*
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* FUNCTION: acpi_get_type
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*
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* PARAMETERS: Handle - Handle of object whose type is desired
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* ret_type - Where the type will be placed
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*
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* RETURN: Status
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*
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* DESCRIPTION: This routine returns the type associatd with a particular handle
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*
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******************************************************************************/
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acpi_status acpi_get_type(acpi_handle handle, acpi_object_type * ret_type)
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{
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struct acpi_namespace_node *node;
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acpi_status status;
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/* Parameter Validation */
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if (!ret_type) {
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return (AE_BAD_PARAMETER);
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}
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/*
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* Special case for the predefined Root Node
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* (return type ANY)
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*/
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if (handle == ACPI_ROOT_OBJECT) {
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*ret_type = ACPI_TYPE_ANY;
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return (AE_OK);
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}
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status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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/* Convert and validate the handle */
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node = acpi_ns_map_handle_to_node(handle);
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if (!node) {
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(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
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return (AE_BAD_PARAMETER);
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}
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*ret_type = node->type;
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status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
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return (status);
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}
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EXPORT_SYMBOL(acpi_get_type);
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/*******************************************************************************
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*
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* FUNCTION: acpi_get_parent
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*
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* PARAMETERS: Handle - Handle of object whose parent is desired
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* ret_handle - Where the parent handle will be placed
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*
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* RETURN: Status
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*
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* DESCRIPTION: Returns a handle to the parent of the object represented by
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* Handle.
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*
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******************************************************************************/
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acpi_status acpi_get_parent(acpi_handle handle, acpi_handle * ret_handle)
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{
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struct acpi_namespace_node *node;
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acpi_status status;
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if (!ret_handle) {
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return (AE_BAD_PARAMETER);
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}
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/* Special case for the predefined Root Node (no parent) */
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if (handle == ACPI_ROOT_OBJECT) {
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return (AE_NULL_ENTRY);
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}
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status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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/* Convert and validate the handle */
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node = acpi_ns_map_handle_to_node(handle);
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if (!node) {
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status = AE_BAD_PARAMETER;
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goto unlock_and_exit;
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}
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/* Get the parent entry */
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*ret_handle =
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acpi_ns_convert_entry_to_handle(acpi_ns_get_parent_node(node));
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/* Return exception if parent is null */
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if (!acpi_ns_get_parent_node(node)) {
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status = AE_NULL_ENTRY;
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}
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unlock_and_exit:
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(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
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return (status);
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}
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EXPORT_SYMBOL(acpi_get_parent);
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/*******************************************************************************
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*
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* FUNCTION: acpi_get_next_object
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*
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* PARAMETERS: Type - Type of object to be searched for
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* Parent - Parent object whose children we are getting
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* last_child - Previous child that was found.
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* The NEXT child will be returned
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* ret_handle - Where handle to the next object is placed
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*
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* RETURN: Status
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*
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* DESCRIPTION: Return the next peer object within the namespace. If Handle is
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* valid, Scope is ignored. Otherwise, the first object within
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* Scope is returned.
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*
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******************************************************************************/
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acpi_status
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acpi_get_next_object(acpi_object_type type,
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acpi_handle parent,
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acpi_handle child, acpi_handle * ret_handle)
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{
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acpi_status status;
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struct acpi_namespace_node *node;
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struct acpi_namespace_node *parent_node = NULL;
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struct acpi_namespace_node *child_node = NULL;
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/* Parameter validation */
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if (type > ACPI_TYPE_EXTERNAL_MAX) {
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return (AE_BAD_PARAMETER);
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}
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status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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/* If null handle, use the parent */
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if (!child) {
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/* Start search at the beginning of the specified scope */
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parent_node = acpi_ns_map_handle_to_node(parent);
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if (!parent_node) {
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status = AE_BAD_PARAMETER;
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goto unlock_and_exit;
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}
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} else {
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/* Non-null handle, ignore the parent */
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/* Convert and validate the handle */
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child_node = acpi_ns_map_handle_to_node(child);
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if (!child_node) {
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status = AE_BAD_PARAMETER;
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goto unlock_and_exit;
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}
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}
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/* Internal function does the real work */
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node = acpi_ns_get_next_node(type, parent_node, child_node);
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if (!node) {
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status = AE_NOT_FOUND;
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goto unlock_and_exit;
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}
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if (ret_handle) {
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*ret_handle = acpi_ns_convert_entry_to_handle(node);
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}
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unlock_and_exit:
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(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
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return (status);
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}
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EXPORT_SYMBOL(acpi_get_next_object);
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