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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/*******************************************************************************
*
* Module Name: nsxfobj - Public interfaces to the ACPI subsystem
* ACPI Object oriented interfaces
*
******************************************************************************/
#define EXPORT_ACPI_INTERFACES
#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"
#define _COMPONENT ACPI_NAMESPACE
ACPI_MODULE_NAME("nsxfobj")
/*******************************************************************************
*
* FUNCTION: acpi_get_type
*
* PARAMETERS: handle - Handle of object whose type is desired
* ret_type - Where the type will be placed
*
* RETURN: Status
*
* DESCRIPTION: This routine returns the type associatd with a particular handle
*
******************************************************************************/
acpi_status acpi_get_type(acpi_handle handle, acpi_object_type *ret_type)
{
struct acpi_namespace_node *node;
acpi_status status;
/* Parameter Validation */
if (!ret_type) {
return (AE_BAD_PARAMETER);
}
/* Special case for the predefined Root Node (return type ANY) */
if (handle == ACPI_ROOT_OBJECT) {
*ret_type = ACPI_TYPE_ANY;
return (AE_OK);
}
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return (status);
}
/* Convert and validate the handle */
node = acpi_ns_validate_handle(handle);
if (!node) {
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
return (AE_BAD_PARAMETER);
}
*ret_type = node->type;
status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
return (status);
}
ACPI_EXPORT_SYMBOL(acpi_get_type)
/*******************************************************************************
*
* FUNCTION: acpi_get_parent
*
* PARAMETERS: handle - Handle of object whose parent is desired
* ret_handle - Where the parent handle will be placed
*
* RETURN: Status
*
* DESCRIPTION: Returns a handle to the parent of the object represented by
* Handle.
*
******************************************************************************/
acpi_status acpi_get_parent(acpi_handle handle, acpi_handle *ret_handle)
{
struct acpi_namespace_node *node;
struct acpi_namespace_node *parent_node;
acpi_status status;
if (!ret_handle) {
return (AE_BAD_PARAMETER);
}
/* Special case for the predefined Root Node (no parent) */
if (handle == ACPI_ROOT_OBJECT) {
return (AE_NULL_ENTRY);
}
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return (status);
}
/* Convert and validate the handle */
node = acpi_ns_validate_handle(handle);
if (!node) {
status = AE_BAD_PARAMETER;
goto unlock_and_exit;
}
/* Get the parent entry */
parent_node = node->parent;
*ret_handle = ACPI_CAST_PTR(acpi_handle, parent_node);
/* Return exception if parent is null */
if (!parent_node) {
status = AE_NULL_ENTRY;
}
unlock_and_exit:
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
return (status);
}
ACPI_EXPORT_SYMBOL(acpi_get_parent)
/*******************************************************************************
*
* FUNCTION: acpi_get_next_object
*
* PARAMETERS: type - Type of object to be searched for
* parent - Parent object whose children we are getting
* last_child - Previous child that was found.
* The NEXT child will be returned
* ret_handle - Where handle to the next object is placed
*
* RETURN: Status
*
* DESCRIPTION: Return the next peer object within the namespace. If Handle is
* valid, Scope is ignored. Otherwise, the first object within
* Scope is returned.
*
******************************************************************************/
acpi_status
acpi_get_next_object(acpi_object_type type,
acpi_handle parent,
acpi_handle child, acpi_handle *ret_handle)
{
acpi_status status;
struct acpi_namespace_node *node;
struct acpi_namespace_node *parent_node = NULL;
struct acpi_namespace_node *child_node = NULL;
/* Parameter validation */
if (type > ACPI_TYPE_EXTERNAL_MAX) {
return (AE_BAD_PARAMETER);
}
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return (status);
}
/* If null handle, use the parent */
if (!child) {
/* Start search at the beginning of the specified scope */
parent_node = acpi_ns_validate_handle(parent);
if (!parent_node) {
status = AE_BAD_PARAMETER;
goto unlock_and_exit;
}
} else {
/* Non-null handle, ignore the parent */
/* Convert and validate the handle */
child_node = acpi_ns_validate_handle(child);
if (!child_node) {
status = AE_BAD_PARAMETER;
goto unlock_and_exit;
}
}
/* Internal function does the real work */
node = acpi_ns_get_next_node_typed(type, parent_node, child_node);
if (!node) {
status = AE_NOT_FOUND;
goto unlock_and_exit;
}
if (ret_handle) {
*ret_handle = ACPI_CAST_PTR(acpi_handle, node);
}
unlock_and_exit:
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
return (status);
}
ACPI_EXPORT_SYMBOL(acpi_get_next_object)
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