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linux/drivers/acpi/acpica/nsutils.c
Bob Moore a8357b0c95 ACPICA: Update all ACPICA copyrights and signons to 2010 
Add 2010 copyright to all module headers and signons, including
the Linux header. This affects virtually every file in the ACPICA
core subsystem, iASL compiler, and all utilities.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
2010-01-22 12:30:05 -05:00

963 lines
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/******************************************************************************
*
* Module Name: nsutils - Utilities for accessing ACPI namespace, accessing
* parents and siblings and Scope manipulation
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2010, Intel Corp.
* 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 "accommon.h"
#include "acnamesp.h"
#include "amlcode.h"
#include "actables.h"
#define _COMPONENT ACPI_NAMESPACE
ACPI_MODULE_NAME("nsutils")
/* Local prototypes */
static u8 acpi_ns_valid_path_separator(char sep);
#ifdef ACPI_OBSOLETE_FUNCTIONS
acpi_name acpi_ns_find_parent_name(struct acpi_namespace_node *node_to_search);
#endif
/*******************************************************************************
*
* FUNCTION: acpi_ns_report_error
*
* PARAMETERS: module_name - Caller's module name (for error output)
* line_number - Caller's line number (for error output)
* internal_name - Name or path of the namespace node
* lookup_status - Exception code from NS lookup
*
* RETURN: None
*
* DESCRIPTION: Print warning message with full pathname
*
******************************************************************************/
void
acpi_ns_report_error(const char *module_name,
u32 line_number,
const char *internal_name, acpi_status lookup_status)
{
acpi_status status;
u32 bad_name;
char *name = NULL;
acpi_os_printf("ACPI Error (%s-%04d): ", module_name, line_number);
if (lookup_status == AE_BAD_CHARACTER) {
/* There is a non-ascii character in the name */
ACPI_MOVE_32_TO_32(&bad_name,
ACPI_CAST_PTR(u32, internal_name));
acpi_os_printf("[0x%4.4X] (NON-ASCII)", bad_name);
} else {
/* Convert path to external format */
status = acpi_ns_externalize_name(ACPI_UINT32_MAX,
internal_name, NULL, &name);
/* Print target name */
if (ACPI_SUCCESS(status)) {
acpi_os_printf("[%s]", name);
} else {
acpi_os_printf("[COULD NOT EXTERNALIZE NAME]");
}
if (name) {
ACPI_FREE(name);
}
}
acpi_os_printf(" Namespace lookup failure, %s\n",
acpi_format_exception(lookup_status));
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_report_method_error
*
* PARAMETERS: module_name - Caller's module name (for error output)
* line_number - Caller's line number (for error output)
* Message - Error message to use on failure
* prefix_node - Prefix relative to the path
* Path - Path to the node (optional)
* method_status - Execution status
*
* RETURN: None
*
* DESCRIPTION: Print warning message with full pathname
*
******************************************************************************/
void
acpi_ns_report_method_error(const char *module_name,
u32 line_number,
const char *message,
struct acpi_namespace_node *prefix_node,
const char *path, acpi_status method_status)
{
acpi_status status;
struct acpi_namespace_node *node = prefix_node;
acpi_os_printf("ACPI Error (%s-%04d): ", module_name, line_number);
if (path) {
status =
acpi_ns_get_node(prefix_node, path, ACPI_NS_NO_UPSEARCH,
&node);
if (ACPI_FAILURE(status)) {
acpi_os_printf("[Could not get node by pathname]");
}
}
acpi_ns_print_node_pathname(node, message);
acpi_os_printf(", %s\n", acpi_format_exception(method_status));
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_print_node_pathname
*
* PARAMETERS: Node - Object
* Message - Prefix message
*
* DESCRIPTION: Print an object's full namespace pathname
* Manages allocation/freeing of a pathname buffer
*
******************************************************************************/
void
acpi_ns_print_node_pathname(struct acpi_namespace_node *node,
const char *message)
{
struct acpi_buffer buffer;
acpi_status status;
if (!node) {
acpi_os_printf("[NULL NAME]");
return;
}
/* Convert handle to full pathname and print it (with supplied message) */
buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
status = acpi_ns_handle_to_pathname(node, &buffer);
if (ACPI_SUCCESS(status)) {
if (message) {
acpi_os_printf("%s ", message);
}
acpi_os_printf("[%s] (Node %p)", (char *)buffer.pointer, node);
ACPI_FREE(buffer.pointer);
}
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_valid_root_prefix
*
* PARAMETERS: Prefix - Character to be checked
*
* RETURN: TRUE if a valid prefix
*
* DESCRIPTION: Check if a character is a valid ACPI Root prefix
*
******************************************************************************/
u8 acpi_ns_valid_root_prefix(char prefix)
{
return ((u8) (prefix == '\\'));
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_valid_path_separator
*
* PARAMETERS: Sep - Character to be checked
*
* RETURN: TRUE if a valid path separator
*
* DESCRIPTION: Check if a character is a valid ACPI path separator
*
******************************************************************************/
static u8 acpi_ns_valid_path_separator(char sep)
{
return ((u8) (sep == '.'));
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_get_type
*
* PARAMETERS: Node - Parent Node to be examined
*
* RETURN: Type field from Node whose handle is passed
*
* DESCRIPTION: Return the type of a Namespace node
*
******************************************************************************/
acpi_object_type acpi_ns_get_type(struct acpi_namespace_node * node)
{
ACPI_FUNCTION_TRACE(ns_get_type);
if (!node) {
ACPI_WARNING((AE_INFO, "Null Node parameter"));
return_UINT32(ACPI_TYPE_ANY);
}
return_UINT32((acpi_object_type) node->type);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_local
*
* PARAMETERS: Type - A namespace object type
*
* RETURN: LOCAL if names must be found locally in objects of the
* passed type, 0 if enclosing scopes should be searched
*
* DESCRIPTION: Returns scope rule for the given object type.
*
******************************************************************************/
u32 acpi_ns_local(acpi_object_type type)
{
ACPI_FUNCTION_TRACE(ns_local);
if (!acpi_ut_valid_object_type(type)) {
/* Type code out of range */
ACPI_WARNING((AE_INFO, "Invalid Object Type %X", type));
return_UINT32(ACPI_NS_NORMAL);
}
return_UINT32((u32) acpi_gbl_ns_properties[type] & ACPI_NS_LOCAL);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_get_internal_name_length
*
* PARAMETERS: Info - Info struct initialized with the
* external name pointer.
*
* RETURN: None
*
* DESCRIPTION: Calculate the length of the internal (AML) namestring
* corresponding to the external (ASL) namestring.
*
******************************************************************************/
void acpi_ns_get_internal_name_length(struct acpi_namestring_info *info)
{
const char *next_external_char;
u32 i;
ACPI_FUNCTION_ENTRY();
next_external_char = info->external_name;
info->num_carats = 0;
info->num_segments = 0;
info->fully_qualified = FALSE;
/*
* For the internal name, the required length is 4 bytes per segment, plus
* 1 each for root_prefix, multi_name_prefix_op, segment count, trailing null
* (which is not really needed, but no there's harm in putting it there)
*
* strlen() + 1 covers the first name_seg, which has no path separator
*/
if (acpi_ns_valid_root_prefix(*next_external_char)) {
info->fully_qualified = TRUE;
next_external_char++;
/* Skip redundant root_prefix, like \\_SB.PCI0.SBRG.EC0 */
while (acpi_ns_valid_root_prefix(*next_external_char)) {
next_external_char++;
}
} else {
/* Handle Carat prefixes */
while (*next_external_char == '^') {
info->num_carats++;
next_external_char++;
}
}
/*
* Determine the number of ACPI name "segments" by counting the number of
* path separators within the string. Start with one segment since the
* segment count is [(# separators) + 1], and zero separators is ok.
*/
if (*next_external_char) {
info->num_segments = 1;
for (i = 0; next_external_char[i]; i++) {
if (acpi_ns_valid_path_separator(next_external_char[i])) {
info->num_segments++;
}
}
}
info->length = (ACPI_NAME_SIZE * info->num_segments) +
4 + info->num_carats;
info->next_external_char = next_external_char;
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_build_internal_name
*
* PARAMETERS: Info - Info struct fully initialized
*
* RETURN: Status
*
* DESCRIPTION: Construct the internal (AML) namestring
* corresponding to the external (ASL) namestring.
*
******************************************************************************/
acpi_status acpi_ns_build_internal_name(struct acpi_namestring_info *info)
{
u32 num_segments = info->num_segments;
char *internal_name = info->internal_name;
const char *external_name = info->next_external_char;
char *result = NULL;
u32 i;
ACPI_FUNCTION_TRACE(ns_build_internal_name);
/* Setup the correct prefixes, counts, and pointers */
if (info->fully_qualified) {
internal_name[0] = '\\';
if (num_segments <= 1) {
result = &internal_name[1];
} else if (num_segments == 2) {
internal_name[1] = AML_DUAL_NAME_PREFIX;
result = &internal_name[2];
} else {
internal_name[1] = AML_MULTI_NAME_PREFIX_OP;
internal_name[2] = (char)num_segments;
result = &internal_name[3];
}
} else {
/*
* Not fully qualified.
* Handle Carats first, then append the name segments
*/
i = 0;
if (info->num_carats) {
for (i = 0; i < info->num_carats; i++) {
internal_name[i] = '^';
}
}
if (num_segments <= 1) {
result = &internal_name[i];
} else if (num_segments == 2) {
internal_name[i] = AML_DUAL_NAME_PREFIX;
result = &internal_name[(acpi_size) i + 1];
} else {
internal_name[i] = AML_MULTI_NAME_PREFIX_OP;
internal_name[(acpi_size) i + 1] = (char)num_segments;
result = &internal_name[(acpi_size) i + 2];
}
}
/* Build the name (minus path separators) */
for (; num_segments; num_segments--) {
for (i = 0; i < ACPI_NAME_SIZE; i++) {
if (acpi_ns_valid_path_separator(*external_name) ||
(*external_name == 0)) {
/* Pad the segment with underscore(s) if segment is short */
result[i] = '_';
} else {
/* Convert the character to uppercase and save it */
result[i] =
(char)ACPI_TOUPPER((int)*external_name);
external_name++;
}
}
/* Now we must have a path separator, or the pathname is bad */
if (!acpi_ns_valid_path_separator(*external_name) &&
(*external_name != 0)) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/* Move on the next segment */
external_name++;
result += ACPI_NAME_SIZE;
}
/* Terminate the string */
*result = 0;
if (info->fully_qualified) {
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"Returning [%p] (abs) \"\\%s\"\n",
internal_name, internal_name));
} else {
ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Returning [%p] (rel) \"%s\"\n",
internal_name, internal_name));
}
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_internalize_name
*
* PARAMETERS: *external_name - External representation of name
* **Converted Name - Where to return the resulting
* internal represention of the name
*
* RETURN: Status
*
* DESCRIPTION: Convert an external representation (e.g. "\_PR_.CPU0")
* to internal form (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
*
*******************************************************************************/
acpi_status
acpi_ns_internalize_name(const char *external_name, char **converted_name)
{
char *internal_name;
struct acpi_namestring_info info;
acpi_status status;
ACPI_FUNCTION_TRACE(ns_internalize_name);
if ((!external_name) || (*external_name == 0) || (!converted_name)) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/* Get the length of the new internal name */
info.external_name = external_name;
acpi_ns_get_internal_name_length(&info);
/* We need a segment to store the internal name */
internal_name = ACPI_ALLOCATE_ZEROED(info.length);
if (!internal_name) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
/* Build the name */
info.internal_name = internal_name;
status = acpi_ns_build_internal_name(&info);
if (ACPI_FAILURE(status)) {
ACPI_FREE(internal_name);
return_ACPI_STATUS(status);
}
*converted_name = internal_name;
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_externalize_name
*
* PARAMETERS: internal_name_length - Lenth of the internal name below
* internal_name - Internal representation of name
* converted_name_length - Where the length is returned
* converted_name - Where the resulting external name
* is returned
*
* RETURN: Status
*
* DESCRIPTION: Convert internal name (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
* to its external (printable) form (e.g. "\_PR_.CPU0")
*
******************************************************************************/
acpi_status
acpi_ns_externalize_name(u32 internal_name_length,
const char *internal_name,
u32 * converted_name_length, char **converted_name)
{
u32 names_index = 0;
u32 num_segments = 0;
u32 required_length;
u32 prefix_length = 0;
u32 i = 0;
u32 j = 0;
ACPI_FUNCTION_TRACE(ns_externalize_name);
if (!internal_name_length || !internal_name || !converted_name) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/* Check for a prefix (one '\' | one or more '^') */
switch (internal_name[0]) {
case '\\':
prefix_length = 1;
break;
case '^':
for (i = 0; i < internal_name_length; i++) {
if (internal_name[i] == '^') {
prefix_length = i + 1;
} else {
break;
}
}
if (i == internal_name_length) {
prefix_length = i;
}
break;
default:
break;
}
/*
* Check for object names. Note that there could be 0-255 of these
* 4-byte elements.
*/
if (prefix_length < internal_name_length) {
switch (internal_name[prefix_length]) {
case AML_MULTI_NAME_PREFIX_OP:
/* <count> 4-byte names */
names_index = prefix_length + 2;
num_segments = (u8)
internal_name[(acpi_size) prefix_length + 1];
break;
case AML_DUAL_NAME_PREFIX:
/* Two 4-byte names */
names_index = prefix_length + 1;
num_segments = 2;
break;
case 0:
/* null_name */
names_index = 0;
num_segments = 0;
break;
default:
/* one 4-byte name */
names_index = prefix_length;
num_segments = 1;
break;
}
}
/*
* Calculate the length of converted_name, which equals the length
* of the prefix, length of all object names, length of any required
* punctuation ('.') between object names, plus the NULL terminator.
*/
required_length = prefix_length + (4 * num_segments) +
((num_segments > 0) ? (num_segments - 1) : 0) + 1;
/*
* Check to see if we're still in bounds. If not, there's a problem
* with internal_name (invalid format).
*/
if (required_length > internal_name_length) {
ACPI_ERROR((AE_INFO, "Invalid internal name"));
return_ACPI_STATUS(AE_BAD_PATHNAME);
}
/* Build the converted_name */
*converted_name = ACPI_ALLOCATE_ZEROED(required_length);
if (!(*converted_name)) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
j = 0;
for (i = 0; i < prefix_length; i++) {
(*converted_name)[j++] = internal_name[i];
}
if (num_segments > 0) {
for (i = 0; i < num_segments; i++) {
if (i > 0) {
(*converted_name)[j++] = '.';
}
(*converted_name)[j++] = internal_name[names_index++];
(*converted_name)[j++] = internal_name[names_index++];
(*converted_name)[j++] = internal_name[names_index++];
(*converted_name)[j++] = internal_name[names_index++];
}
}
if (converted_name_length) {
*converted_name_length = (u32) required_length;
}
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_validate_handle
*
* PARAMETERS: Handle - Handle to be validated and typecast to a
* namespace node.
*
* RETURN: A pointer to a namespace node
*
* DESCRIPTION: Convert a namespace handle to a namespace node. Handles special
* cases for the root node.
*
* NOTE: Real integer handles would allow for more verification
* and keep all pointers within this subsystem - however this introduces
* more overhead and has not been necessary to this point. Drivers
* holding handles are typically notified before a node becomes invalid
* due to a table unload.
*
******************************************************************************/
struct acpi_namespace_node *acpi_ns_validate_handle(acpi_handle handle)
{
ACPI_FUNCTION_ENTRY();
/* Parameter validation */
if ((!handle) || (handle == ACPI_ROOT_OBJECT)) {
return (acpi_gbl_root_node);
}
/* We can at least attempt to verify the handle */
if (ACPI_GET_DESCRIPTOR_TYPE(handle) != ACPI_DESC_TYPE_NAMED) {
return (NULL);
}
return (ACPI_CAST_PTR(struct acpi_namespace_node, handle));
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_terminate
*
* PARAMETERS: none
*
* RETURN: none
*
* DESCRIPTION: free memory allocated for namespace and ACPI table storage.
*
******************************************************************************/
void acpi_ns_terminate(void)
{
union acpi_operand_object *obj_desc;
ACPI_FUNCTION_TRACE(ns_terminate);
/*
* 1) Free the entire namespace -- all nodes and objects
*
* Delete all object descriptors attached to namepsace nodes
*/
acpi_ns_delete_namespace_subtree(acpi_gbl_root_node);
/* Detach any objects attached to the root */
obj_desc = acpi_ns_get_attached_object(acpi_gbl_root_node);
if (obj_desc) {
acpi_ns_detach_object(acpi_gbl_root_node);
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Namespace freed\n"));
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_opens_scope
*
* PARAMETERS: Type - A valid namespace type
*
* RETURN: NEWSCOPE if the passed type "opens a name scope" according
* to the ACPI specification, else 0
*
******************************************************************************/
u32 acpi_ns_opens_scope(acpi_object_type type)
{
ACPI_FUNCTION_TRACE_STR(ns_opens_scope, acpi_ut_get_type_name(type));
if (!acpi_ut_valid_object_type(type)) {
/* type code out of range */
ACPI_WARNING((AE_INFO, "Invalid Object Type %X", type));
return_UINT32(ACPI_NS_NORMAL);
}
return_UINT32(((u32) acpi_gbl_ns_properties[type]) & ACPI_NS_NEWSCOPE);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_get_node
*
* PARAMETERS: *Pathname - Name to be found, in external (ASL) format. The
* \ (backslash) and ^ (carat) prefixes, and the
* . (period) to separate segments are supported.
* prefix_node - Root of subtree to be searched, or NS_ALL for the
* root of the name space. If Name is fully
* qualified (first s8 is '\'), the passed value
* of Scope will not be accessed.
* Flags - Used to indicate whether to perform upsearch or
* not.
* return_node - Where the Node is returned
*
* DESCRIPTION: Look up a name relative to a given scope and return the
* corresponding Node. NOTE: Scope can be null.
*
* MUTEX: Locks namespace
*
******************************************************************************/
acpi_status
acpi_ns_get_node(struct acpi_namespace_node *prefix_node,
const char *pathname,
u32 flags, struct acpi_namespace_node **return_node)
{
union acpi_generic_state scope_info;
acpi_status status;
char *internal_path;
ACPI_FUNCTION_TRACE_PTR(ns_get_node, ACPI_CAST_PTR(char, pathname));
if (!pathname) {
*return_node = prefix_node;
if (!prefix_node) {
*return_node = acpi_gbl_root_node;
}
return_ACPI_STATUS(AE_OK);
}
/* Convert path to internal representation */
status = acpi_ns_internalize_name(pathname, &internal_path);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Must lock namespace during lookup */
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
goto cleanup;
}
/* Setup lookup scope (search starting point) */
scope_info.scope.node = prefix_node;
/* Lookup the name in the namespace */
status = acpi_ns_lookup(&scope_info, internal_path, ACPI_TYPE_ANY,
ACPI_IMODE_EXECUTE,
(flags | ACPI_NS_DONT_OPEN_SCOPE), NULL,
return_node);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "%s, %s\n",
pathname, acpi_format_exception(status)));
}
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
cleanup:
ACPI_FREE(internal_path);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_get_parent_node
*
* PARAMETERS: Node - Current table entry
*
* RETURN: Parent entry of the given entry
*
* DESCRIPTION: Obtain the parent entry for a given entry in the namespace.
*
******************************************************************************/
struct acpi_namespace_node *acpi_ns_get_parent_node(struct acpi_namespace_node
*node)
{
ACPI_FUNCTION_ENTRY();
if (!node) {
return (NULL);
}
/*
* Walk to the end of this peer list. The last entry is marked with a flag
* and the peer pointer is really a pointer back to the parent. This saves
* putting a parent back pointer in each and every named object!
*/
while (!(node->flags & ANOBJ_END_OF_PEER_LIST)) {
node = node->peer;
}
return (node->peer);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_get_next_valid_node
*
* PARAMETERS: Node - Current table entry
*
* RETURN: Next valid Node in the linked node list. NULL if no more valid
* nodes.
*
* DESCRIPTION: Find the next valid node within a name table.
* Useful for implementing NULL-end-of-list loops.
*
******************************************************************************/
struct acpi_namespace_node *acpi_ns_get_next_valid_node(struct
acpi_namespace_node
*node)
{
/* If we are at the end of this peer list, return NULL */
if (node->flags & ANOBJ_END_OF_PEER_LIST) {
return NULL;
}
/* Otherwise just return the next peer */
return (node->peer);
}
#ifdef ACPI_OBSOLETE_FUNCTIONS
/*******************************************************************************
*
* FUNCTION: acpi_ns_find_parent_name
*
* PARAMETERS: *child_node - Named Obj whose name is to be found
*
* RETURN: The ACPI name
*
* DESCRIPTION: Search for the given obj in its parent scope and return the
* name segment, or "????" if the parent name can't be found
* (which "should not happen").
*
******************************************************************************/
acpi_name acpi_ns_find_parent_name(struct acpi_namespace_node * child_node)
{
struct acpi_namespace_node *parent_node;
ACPI_FUNCTION_TRACE(ns_find_parent_name);
if (child_node) {
/* Valid entry. Get the parent Node */
parent_node = acpi_ns_get_parent_node(child_node);
if (parent_node) {
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"Parent of %p [%4.4s] is %p [%4.4s]\n",
child_node,
acpi_ut_get_node_name(child_node),
parent_node,
acpi_ut_get_node_name(parent_node)));
if (parent_node->name.integer) {
return_VALUE((acpi_name) parent_node->name.
integer);
}
}
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"Unable to find parent of %p (%4.4s)\n",
child_node,
acpi_ut_get_node_name(child_node)));
}
return_VALUE(ACPI_UNKNOWN_NAME);
}
#endif
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