289 lines
8.7 KiB
C
289 lines
8.7 KiB
C
/******************************************************************************
|
|
*
|
|
* Module Name: nswalk - Functions for walking the ACPI namespace
|
|
*
|
|
*****************************************************************************/
|
|
|
|
/*
|
|
* Copyright (C) 2000 - 2006, R. Byron Moore
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions, and the following disclaimer,
|
|
* without modification.
|
|
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
|
|
* substantially similar to the "NO WARRANTY" disclaimer below
|
|
* ("Disclaimer") and any redistribution must be conditioned upon
|
|
* including a substantially similar Disclaimer requirement for further
|
|
* binary redistribution.
|
|
* 3. Neither the names of the above-listed copyright holders nor the names
|
|
* of any contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* Alternatively, this software may be distributed under the terms of the
|
|
* GNU General Public License ("GPL") version 2 as published by the Free
|
|
* Software Foundation.
|
|
*
|
|
* NO WARRANTY
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
|
|
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGES.
|
|
*/
|
|
|
|
#include <acpi/acpi.h>
|
|
#include <acpi/acnamesp.h>
|
|
|
|
#define _COMPONENT ACPI_NAMESPACE
|
|
ACPI_MODULE_NAME("nswalk")
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ns_get_next_node
|
|
*
|
|
* PARAMETERS: Type - Type of node to be searched for
|
|
* parent_node - Parent node whose children we are
|
|
* getting
|
|
* child_node - Previous child that was found.
|
|
* The NEXT child will be returned
|
|
*
|
|
* RETURN: struct acpi_namespace_node - Pointer to the NEXT child or NULL if
|
|
* none is found.
|
|
*
|
|
* DESCRIPTION: Return the next peer node within the namespace. If Handle
|
|
* is valid, Scope is ignored. Otherwise, the first node
|
|
* within Scope is returned.
|
|
*
|
|
******************************************************************************/
|
|
struct acpi_namespace_node *acpi_ns_get_next_node(acpi_object_type type,
|
|
struct acpi_namespace_node
|
|
*parent_node,
|
|
struct acpi_namespace_node
|
|
*child_node)
|
|
{
|
|
struct acpi_namespace_node *next_node = NULL;
|
|
|
|
ACPI_FUNCTION_ENTRY();
|
|
|
|
if (!child_node) {
|
|
|
|
/* It's really the parent's _scope_ that we want */
|
|
|
|
if (parent_node->child) {
|
|
next_node = parent_node->child;
|
|
}
|
|
}
|
|
|
|
else {
|
|
/* Start search at the NEXT node */
|
|
|
|
next_node = acpi_ns_get_next_valid_node(child_node);
|
|
}
|
|
|
|
/* If any type is OK, we are done */
|
|
|
|
if (type == ACPI_TYPE_ANY) {
|
|
|
|
/* next_node is NULL if we are at the end-of-list */
|
|
|
|
return (next_node);
|
|
}
|
|
|
|
/* Must search for the node -- but within this scope only */
|
|
|
|
while (next_node) {
|
|
|
|
/* If type matches, we are done */
|
|
|
|
if (next_node->type == type) {
|
|
return (next_node);
|
|
}
|
|
|
|
/* Otherwise, move on to the next node */
|
|
|
|
next_node = acpi_ns_get_next_valid_node(next_node);
|
|
}
|
|
|
|
/* Not found */
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ns_walk_namespace
|
|
*
|
|
* PARAMETERS: Type - acpi_object_type to search for
|
|
* start_node - Handle in namespace where search begins
|
|
* max_depth - Depth to which search is to reach
|
|
* unlock_before_callback- Whether to unlock the NS before invoking
|
|
* the callback routine
|
|
* user_function - Called when an object of "Type" is found
|
|
* Context - Passed to user function
|
|
* return_value - from the user_function if terminated early.
|
|
* Otherwise, returns NULL.
|
|
* RETURNS: Status
|
|
*
|
|
* DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
|
|
* starting (and ending) at the node specified by start_handle.
|
|
* The user_function is called whenever a node that matches
|
|
* the type parameter is found. If the user function returns
|
|
* a non-zero value, the search is terminated immediately and this
|
|
* value is returned to the caller.
|
|
*
|
|
* The point of this procedure is to provide a generic namespace
|
|
* walk routine that can be called from multiple places to
|
|
* provide multiple services; the User Function can be tailored
|
|
* to each task, whether it is a print function, a compare
|
|
* function, etc.
|
|
*
|
|
******************************************************************************/
|
|
|
|
acpi_status
|
|
acpi_ns_walk_namespace(acpi_object_type type,
|
|
acpi_handle start_node,
|
|
u32 max_depth,
|
|
u8 unlock_before_callback,
|
|
acpi_walk_callback user_function,
|
|
void *context, void **return_value)
|
|
{
|
|
acpi_status status;
|
|
acpi_status mutex_status;
|
|
struct acpi_namespace_node *child_node;
|
|
struct acpi_namespace_node *parent_node;
|
|
acpi_object_type child_type;
|
|
u32 level;
|
|
|
|
ACPI_FUNCTION_TRACE(ns_walk_namespace);
|
|
|
|
/* Special case for the namespace Root Node */
|
|
|
|
if (start_node == ACPI_ROOT_OBJECT) {
|
|
start_node = acpi_gbl_root_node;
|
|
}
|
|
|
|
/* Null child means "get first node" */
|
|
|
|
parent_node = start_node;
|
|
child_node = NULL;
|
|
child_type = ACPI_TYPE_ANY;
|
|
level = 1;
|
|
|
|
/*
|
|
* Traverse the tree of nodes until we bubble back up to where we
|
|
* started. When Level is zero, the loop is done because we have
|
|
* bubbled up to (and passed) the original parent handle (start_entry)
|
|
*/
|
|
while (level > 0) {
|
|
|
|
/* Get the next node in this scope. Null if not found */
|
|
|
|
status = AE_OK;
|
|
child_node =
|
|
acpi_ns_get_next_node(ACPI_TYPE_ANY, parent_node,
|
|
child_node);
|
|
if (child_node) {
|
|
/*
|
|
* Found node, Get the type if we are not
|
|
* searching for ANY
|
|
*/
|
|
if (type != ACPI_TYPE_ANY) {
|
|
child_type = child_node->type;
|
|
}
|
|
|
|
if (child_type == type) {
|
|
/*
|
|
* Found a matching node, invoke the user
|
|
* callback function
|
|
*/
|
|
if (unlock_before_callback) {
|
|
mutex_status =
|
|
acpi_ut_release_mutex
|
|
(ACPI_MTX_NAMESPACE);
|
|
if (ACPI_FAILURE(mutex_status)) {
|
|
return_ACPI_STATUS
|
|
(mutex_status);
|
|
}
|
|
}
|
|
|
|
status = user_function(child_node, level,
|
|
context, return_value);
|
|
|
|
if (unlock_before_callback) {
|
|
mutex_status =
|
|
acpi_ut_acquire_mutex
|
|
(ACPI_MTX_NAMESPACE);
|
|
if (ACPI_FAILURE(mutex_status)) {
|
|
return_ACPI_STATUS
|
|
(mutex_status);
|
|
}
|
|
}
|
|
|
|
switch (status) {
|
|
case AE_OK:
|
|
case AE_CTRL_DEPTH:
|
|
|
|
/* Just keep going */
|
|
break;
|
|
|
|
case AE_CTRL_TERMINATE:
|
|
|
|
/* Exit now, with OK status */
|
|
|
|
return_ACPI_STATUS(AE_OK);
|
|
|
|
default:
|
|
|
|
/* All others are valid exceptions */
|
|
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Depth first search:
|
|
* Attempt to go down another level in the namespace
|
|
* if we are allowed to. Don't go any further if we
|
|
* have reached the caller specified maximum depth
|
|
* or if the user function has specified that the
|
|
* maximum depth has been reached.
|
|
*/
|
|
if ((level < max_depth) && (status != AE_CTRL_DEPTH)) {
|
|
if (acpi_ns_get_next_node
|
|
(ACPI_TYPE_ANY, child_node, NULL)) {
|
|
/*
|
|
* There is at least one child of this
|
|
* node, visit the onde
|
|
*/
|
|
level++;
|
|
parent_node = child_node;
|
|
child_node = NULL;
|
|
}
|
|
}
|
|
} else {
|
|
/*
|
|
* No more children of this node (acpi_ns_get_next_node
|
|
* failed), go back upwards in the namespace tree to
|
|
* the node's parent.
|
|
*/
|
|
level--;
|
|
child_node = parent_node;
|
|
parent_node = acpi_ns_get_parent_node(parent_node);
|
|
}
|
|
}
|
|
|
|
/* Complete walk, not terminated by user function */
|
|
|
|
return_ACPI_STATUS(AE_OK);
|
|
}
|