On Tue, Nov 06, 2007 at 02:33:53AM -0800, akpm@linux-foundation.org wrote:
[mmotm.git] / drivers / acpi / acpica / nsutils.c
blobea55ab4f984924937feca72f00cb056d02bc1993
1 /******************************************************************************
3 * Module Name: nsutils - Utilities for accessing ACPI namespace, accessing
4 * parents and siblings and Scope manipulation
6 *****************************************************************************/
8 /*
9 * Copyright (C) 2000 - 2008, Intel Corp.
10 * All rights reserved.
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.
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.
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.
45 #include <acpi/acpi.h>
46 #include "accommon.h"
47 #include "acnamesp.h"
48 #include "amlcode.h"
49 #include "actables.h"
51 #define _COMPONENT ACPI_NAMESPACE
52 ACPI_MODULE_NAME("nsutils")
54 /* Local prototypes */
55 static u8 acpi_ns_valid_path_separator(char sep);
57 #ifdef ACPI_OBSOLETE_FUNCTIONS
58 acpi_name acpi_ns_find_parent_name(struct acpi_namespace_node *node_to_search);
59 #endif
61 /*******************************************************************************
63 * FUNCTION: acpi_ns_report_error
65 * PARAMETERS: module_name - Caller's module name (for error output)
66 * line_number - Caller's line number (for error output)
67 * internal_name - Name or path of the namespace node
68 * lookup_status - Exception code from NS lookup
70 * RETURN: None
72 * DESCRIPTION: Print warning message with full pathname
74 ******************************************************************************/
76 void
77 acpi_ns_report_error(const char *module_name,
78 u32 line_number,
79 const char *internal_name, acpi_status lookup_status)
81 acpi_status status;
82 u32 bad_name;
83 char *name = NULL;
85 acpi_os_printf("ACPI Error (%s-%04d): ", module_name, line_number);
87 if (lookup_status == AE_BAD_CHARACTER) {
89 /* There is a non-ascii character in the name */
91 ACPI_MOVE_32_TO_32(&bad_name,
92 ACPI_CAST_PTR(u32, internal_name));
93 acpi_os_printf("[0x%4.4X] (NON-ASCII)", bad_name);
94 } else {
95 /* Convert path to external format */
97 status = acpi_ns_externalize_name(ACPI_UINT32_MAX,
98 internal_name, NULL, &name);
100 /* Print target name */
102 if (ACPI_SUCCESS(status)) {
103 acpi_os_printf("[%s]", name);
104 } else {
105 acpi_os_printf("[COULD NOT EXTERNALIZE NAME]");
108 if (name) {
109 ACPI_FREE(name);
113 acpi_os_printf(" Namespace lookup failure, %s\n",
114 acpi_format_exception(lookup_status));
117 /*******************************************************************************
119 * FUNCTION: acpi_ns_report_method_error
121 * PARAMETERS: module_name - Caller's module name (for error output)
122 * line_number - Caller's line number (for error output)
123 * Message - Error message to use on failure
124 * prefix_node - Prefix relative to the path
125 * Path - Path to the node (optional)
126 * method_status - Execution status
128 * RETURN: None
130 * DESCRIPTION: Print warning message with full pathname
132 ******************************************************************************/
134 void
135 acpi_ns_report_method_error(const char *module_name,
136 u32 line_number,
137 const char *message,
138 struct acpi_namespace_node *prefix_node,
139 const char *path, acpi_status method_status)
141 acpi_status status;
142 struct acpi_namespace_node *node = prefix_node;
144 acpi_os_printf("ACPI Error (%s-%04d): ", module_name, line_number);
146 if (path) {
147 status =
148 acpi_ns_get_node(prefix_node, path, ACPI_NS_NO_UPSEARCH,
149 &node);
150 if (ACPI_FAILURE(status)) {
151 acpi_os_printf("[Could not get node by pathname]");
155 acpi_ns_print_node_pathname(node, message);
156 acpi_os_printf(", %s\n", acpi_format_exception(method_status));
159 /*******************************************************************************
161 * FUNCTION: acpi_ns_print_node_pathname
163 * PARAMETERS: Node - Object
164 * Message - Prefix message
166 * DESCRIPTION: Print an object's full namespace pathname
167 * Manages allocation/freeing of a pathname buffer
169 ******************************************************************************/
171 void
172 acpi_ns_print_node_pathname(struct acpi_namespace_node *node,
173 const char *message)
175 struct acpi_buffer buffer;
176 acpi_status status;
178 if (!node) {
179 acpi_os_printf("[NULL NAME]");
180 return;
183 /* Convert handle to full pathname and print it (with supplied message) */
185 buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
187 status = acpi_ns_handle_to_pathname(node, &buffer);
188 if (ACPI_SUCCESS(status)) {
189 if (message) {
190 acpi_os_printf("%s ", message);
193 acpi_os_printf("[%s] (Node %p)", (char *)buffer.pointer, node);
194 ACPI_FREE(buffer.pointer);
198 /*******************************************************************************
200 * FUNCTION: acpi_ns_valid_root_prefix
202 * PARAMETERS: Prefix - Character to be checked
204 * RETURN: TRUE if a valid prefix
206 * DESCRIPTION: Check if a character is a valid ACPI Root prefix
208 ******************************************************************************/
210 u8 acpi_ns_valid_root_prefix(char prefix)
213 return ((u8) (prefix == '\\'));
216 /*******************************************************************************
218 * FUNCTION: acpi_ns_valid_path_separator
220 * PARAMETERS: Sep - Character to be checked
222 * RETURN: TRUE if a valid path separator
224 * DESCRIPTION: Check if a character is a valid ACPI path separator
226 ******************************************************************************/
228 static u8 acpi_ns_valid_path_separator(char sep)
231 return ((u8) (sep == '.'));
234 /*******************************************************************************
236 * FUNCTION: acpi_ns_get_type
238 * PARAMETERS: Node - Parent Node to be examined
240 * RETURN: Type field from Node whose handle is passed
242 * DESCRIPTION: Return the type of a Namespace node
244 ******************************************************************************/
246 acpi_object_type acpi_ns_get_type(struct acpi_namespace_node * node)
248 ACPI_FUNCTION_TRACE(ns_get_type);
250 if (!node) {
251 ACPI_WARNING((AE_INFO, "Null Node parameter"));
252 return_UINT32(ACPI_TYPE_ANY);
255 return_UINT32((acpi_object_type) node->type);
258 /*******************************************************************************
260 * FUNCTION: acpi_ns_local
262 * PARAMETERS: Type - A namespace object type
264 * RETURN: LOCAL if names must be found locally in objects of the
265 * passed type, 0 if enclosing scopes should be searched
267 * DESCRIPTION: Returns scope rule for the given object type.
269 ******************************************************************************/
271 u32 acpi_ns_local(acpi_object_type type)
273 ACPI_FUNCTION_TRACE(ns_local);
275 if (!acpi_ut_valid_object_type(type)) {
277 /* Type code out of range */
279 ACPI_WARNING((AE_INFO, "Invalid Object Type %X", type));
280 return_UINT32(ACPI_NS_NORMAL);
283 return_UINT32((u32) acpi_gbl_ns_properties[type] & ACPI_NS_LOCAL);
286 /*******************************************************************************
288 * FUNCTION: acpi_ns_get_internal_name_length
290 * PARAMETERS: Info - Info struct initialized with the
291 * external name pointer.
293 * RETURN: None
295 * DESCRIPTION: Calculate the length of the internal (AML) namestring
296 * corresponding to the external (ASL) namestring.
298 ******************************************************************************/
300 void acpi_ns_get_internal_name_length(struct acpi_namestring_info *info)
302 const char *next_external_char;
303 u32 i;
305 ACPI_FUNCTION_ENTRY();
307 next_external_char = info->external_name;
308 info->num_carats = 0;
309 info->num_segments = 0;
310 info->fully_qualified = FALSE;
313 * For the internal name, the required length is 4 bytes per segment, plus
314 * 1 each for root_prefix, multi_name_prefix_op, segment count, trailing null
315 * (which is not really needed, but no there's harm in putting it there)
317 * strlen() + 1 covers the first name_seg, which has no path separator
319 if (acpi_ns_valid_root_prefix(*next_external_char)) {
320 info->fully_qualified = TRUE;
321 next_external_char++;
323 /* Skip redundant root_prefix, like \\_SB.PCI0.SBRG.EC0 */
325 while (acpi_ns_valid_root_prefix(*next_external_char)) {
326 next_external_char++;
328 } else {
329 /* Handle Carat prefixes */
331 while (*next_external_char == '^') {
332 info->num_carats++;
333 next_external_char++;
338 * Determine the number of ACPI name "segments" by counting the number of
339 * path separators within the string. Start with one segment since the
340 * segment count is [(# separators) + 1], and zero separators is ok.
342 if (*next_external_char) {
343 info->num_segments = 1;
344 for (i = 0; next_external_char[i]; i++) {
345 if (acpi_ns_valid_path_separator(next_external_char[i])) {
346 info->num_segments++;
351 info->length = (ACPI_NAME_SIZE * info->num_segments) +
352 4 + info->num_carats;
354 info->next_external_char = next_external_char;
357 /*******************************************************************************
359 * FUNCTION: acpi_ns_build_internal_name
361 * PARAMETERS: Info - Info struct fully initialized
363 * RETURN: Status
365 * DESCRIPTION: Construct the internal (AML) namestring
366 * corresponding to the external (ASL) namestring.
368 ******************************************************************************/
370 acpi_status acpi_ns_build_internal_name(struct acpi_namestring_info *info)
372 u32 num_segments = info->num_segments;
373 char *internal_name = info->internal_name;
374 const char *external_name = info->next_external_char;
375 char *result = NULL;
376 u32 i;
378 ACPI_FUNCTION_TRACE(ns_build_internal_name);
380 /* Setup the correct prefixes, counts, and pointers */
382 if (info->fully_qualified) {
383 internal_name[0] = '\\';
385 if (num_segments <= 1) {
386 result = &internal_name[1];
387 } else if (num_segments == 2) {
388 internal_name[1] = AML_DUAL_NAME_PREFIX;
389 result = &internal_name[2];
390 } else {
391 internal_name[1] = AML_MULTI_NAME_PREFIX_OP;
392 internal_name[2] = (char)num_segments;
393 result = &internal_name[3];
395 } else {
397 * Not fully qualified.
398 * Handle Carats first, then append the name segments
400 i = 0;
401 if (info->num_carats) {
402 for (i = 0; i < info->num_carats; i++) {
403 internal_name[i] = '^';
407 if (num_segments <= 1) {
408 result = &internal_name[i];
409 } else if (num_segments == 2) {
410 internal_name[i] = AML_DUAL_NAME_PREFIX;
411 result = &internal_name[(acpi_size) i + 1];
412 } else {
413 internal_name[i] = AML_MULTI_NAME_PREFIX_OP;
414 internal_name[(acpi_size) i + 1] = (char)num_segments;
415 result = &internal_name[(acpi_size) i + 2];
419 /* Build the name (minus path separators) */
421 for (; num_segments; num_segments--) {
422 for (i = 0; i < ACPI_NAME_SIZE; i++) {
423 if (acpi_ns_valid_path_separator(*external_name) ||
424 (*external_name == 0)) {
426 /* Pad the segment with underscore(s) if segment is short */
428 result[i] = '_';
429 } else {
430 /* Convert the character to uppercase and save it */
432 result[i] =
433 (char)ACPI_TOUPPER((int)*external_name);
434 external_name++;
438 /* Now we must have a path separator, or the pathname is bad */
440 if (!acpi_ns_valid_path_separator(*external_name) &&
441 (*external_name != 0)) {
442 return_ACPI_STATUS(AE_BAD_PARAMETER);
445 /* Move on the next segment */
447 external_name++;
448 result += ACPI_NAME_SIZE;
451 /* Terminate the string */
453 *result = 0;
455 if (info->fully_qualified) {
456 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
457 "Returning [%p] (abs) \"\\%s\"\n",
458 internal_name, internal_name));
459 } else {
460 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Returning [%p] (rel) \"%s\"\n",
461 internal_name, internal_name));
464 return_ACPI_STATUS(AE_OK);
467 /*******************************************************************************
469 * FUNCTION: acpi_ns_internalize_name
471 * PARAMETERS: *external_name - External representation of name
472 * **Converted Name - Where to return the resulting
473 * internal represention of the name
475 * RETURN: Status
477 * DESCRIPTION: Convert an external representation (e.g. "\_PR_.CPU0")
478 * to internal form (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
480 *******************************************************************************/
482 acpi_status
483 acpi_ns_internalize_name(const char *external_name, char **converted_name)
485 char *internal_name;
486 struct acpi_namestring_info info;
487 acpi_status status;
489 ACPI_FUNCTION_TRACE(ns_internalize_name);
491 if ((!external_name) || (*external_name == 0) || (!converted_name)) {
492 return_ACPI_STATUS(AE_BAD_PARAMETER);
495 /* Get the length of the new internal name */
497 info.external_name = external_name;
498 acpi_ns_get_internal_name_length(&info);
500 /* We need a segment to store the internal name */
502 internal_name = ACPI_ALLOCATE_ZEROED(info.length);
503 if (!internal_name) {
504 return_ACPI_STATUS(AE_NO_MEMORY);
507 /* Build the name */
509 info.internal_name = internal_name;
510 status = acpi_ns_build_internal_name(&info);
511 if (ACPI_FAILURE(status)) {
512 ACPI_FREE(internal_name);
513 return_ACPI_STATUS(status);
516 *converted_name = internal_name;
517 return_ACPI_STATUS(AE_OK);
520 /*******************************************************************************
522 * FUNCTION: acpi_ns_externalize_name
524 * PARAMETERS: internal_name_length - Lenth of the internal name below
525 * internal_name - Internal representation of name
526 * converted_name_length - Where the length is returned
527 * converted_name - Where the resulting external name
528 * is returned
530 * RETURN: Status
532 * DESCRIPTION: Convert internal name (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
533 * to its external (printable) form (e.g. "\_PR_.CPU0")
535 ******************************************************************************/
537 acpi_status
538 acpi_ns_externalize_name(u32 internal_name_length,
539 const char *internal_name,
540 u32 * converted_name_length, char **converted_name)
542 u32 names_index = 0;
543 u32 num_segments = 0;
544 u32 required_length;
545 u32 prefix_length = 0;
546 u32 i = 0;
547 u32 j = 0;
549 ACPI_FUNCTION_TRACE(ns_externalize_name);
551 if (!internal_name_length || !internal_name || !converted_name) {
552 return_ACPI_STATUS(AE_BAD_PARAMETER);
555 /* Check for a prefix (one '\' | one or more '^') */
557 switch (internal_name[0]) {
558 case '\\':
559 prefix_length = 1;
560 break;
562 case '^':
563 for (i = 0; i < internal_name_length; i++) {
564 if (internal_name[i] == '^') {
565 prefix_length = i + 1;
566 } else {
567 break;
571 if (i == internal_name_length) {
572 prefix_length = i;
575 break;
577 default:
578 break;
582 * Check for object names. Note that there could be 0-255 of these
583 * 4-byte elements.
585 if (prefix_length < internal_name_length) {
586 switch (internal_name[prefix_length]) {
587 case AML_MULTI_NAME_PREFIX_OP:
589 /* <count> 4-byte names */
591 names_index = prefix_length + 2;
592 num_segments = (u8)
593 internal_name[(acpi_size) prefix_length + 1];
594 break;
596 case AML_DUAL_NAME_PREFIX:
598 /* Two 4-byte names */
600 names_index = prefix_length + 1;
601 num_segments = 2;
602 break;
604 case 0:
606 /* null_name */
608 names_index = 0;
609 num_segments = 0;
610 break;
612 default:
614 /* one 4-byte name */
616 names_index = prefix_length;
617 num_segments = 1;
618 break;
623 * Calculate the length of converted_name, which equals the length
624 * of the prefix, length of all object names, length of any required
625 * punctuation ('.') between object names, plus the NULL terminator.
627 required_length = prefix_length + (4 * num_segments) +
628 ((num_segments > 0) ? (num_segments - 1) : 0) + 1;
631 * Check to see if we're still in bounds. If not, there's a problem
632 * with internal_name (invalid format).
634 if (required_length > internal_name_length) {
635 ACPI_ERROR((AE_INFO, "Invalid internal name"));
636 return_ACPI_STATUS(AE_BAD_PATHNAME);
639 /* Build the converted_name */
641 *converted_name = ACPI_ALLOCATE_ZEROED(required_length);
642 if (!(*converted_name)) {
643 return_ACPI_STATUS(AE_NO_MEMORY);
646 j = 0;
648 for (i = 0; i < prefix_length; i++) {
649 (*converted_name)[j++] = internal_name[i];
652 if (num_segments > 0) {
653 for (i = 0; i < num_segments; i++) {
654 if (i > 0) {
655 (*converted_name)[j++] = '.';
658 (*converted_name)[j++] = internal_name[names_index++];
659 (*converted_name)[j++] = internal_name[names_index++];
660 (*converted_name)[j++] = internal_name[names_index++];
661 (*converted_name)[j++] = internal_name[names_index++];
665 if (converted_name_length) {
666 *converted_name_length = (u32) required_length;
669 return_ACPI_STATUS(AE_OK);
672 /*******************************************************************************
674 * FUNCTION: acpi_ns_map_handle_to_node
676 * PARAMETERS: Handle - Handle to be converted to an Node
678 * RETURN: A Name table entry pointer
680 * DESCRIPTION: Convert a namespace handle to a real Node
682 * Note: Real integer handles would allow for more verification
683 * and keep all pointers within this subsystem - however this introduces
684 * more (and perhaps unnecessary) overhead.
686 * The current implemenation is basically a placeholder until such time comes
687 * that it is needed.
689 ******************************************************************************/
691 struct acpi_namespace_node *acpi_ns_map_handle_to_node(acpi_handle handle)
694 ACPI_FUNCTION_ENTRY();
696 /* Parameter validation */
698 if ((!handle) || (handle == ACPI_ROOT_OBJECT)) {
699 return (acpi_gbl_root_node);
702 /* We can at least attempt to verify the handle */
704 if (ACPI_GET_DESCRIPTOR_TYPE(handle) != ACPI_DESC_TYPE_NAMED) {
705 return (NULL);
708 return (ACPI_CAST_PTR(struct acpi_namespace_node, handle));
711 /*******************************************************************************
713 * FUNCTION: acpi_ns_convert_entry_to_handle
715 * PARAMETERS: Node - Node to be converted to a Handle
717 * RETURN: A user handle
719 * DESCRIPTION: Convert a real Node to a namespace handle
721 ******************************************************************************/
723 acpi_handle acpi_ns_convert_entry_to_handle(struct acpi_namespace_node *node)
727 * Simple implementation for now;
729 return ((acpi_handle) node);
731 /* Example future implementation ---------------------
733 if (!Node)
735 return (NULL);
738 if (Node == acpi_gbl_root_node)
740 return (ACPI_ROOT_OBJECT);
743 return ((acpi_handle) Node);
744 ------------------------------------------------------*/
747 /*******************************************************************************
749 * FUNCTION: acpi_ns_terminate
751 * PARAMETERS: none
753 * RETURN: none
755 * DESCRIPTION: free memory allocated for namespace and ACPI table storage.
757 ******************************************************************************/
759 void acpi_ns_terminate(void)
761 union acpi_operand_object *obj_desc;
763 ACPI_FUNCTION_TRACE(ns_terminate);
766 * 1) Free the entire namespace -- all nodes and objects
768 * Delete all object descriptors attached to namepsace nodes
770 acpi_ns_delete_namespace_subtree(acpi_gbl_root_node);
772 /* Detach any objects attached to the root */
774 obj_desc = acpi_ns_get_attached_object(acpi_gbl_root_node);
775 if (obj_desc) {
776 acpi_ns_detach_object(acpi_gbl_root_node);
779 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Namespace freed\n"));
780 return_VOID;
783 /*******************************************************************************
785 * FUNCTION: acpi_ns_opens_scope
787 * PARAMETERS: Type - A valid namespace type
789 * RETURN: NEWSCOPE if the passed type "opens a name scope" according
790 * to the ACPI specification, else 0
792 ******************************************************************************/
794 u32 acpi_ns_opens_scope(acpi_object_type type)
796 ACPI_FUNCTION_TRACE_STR(ns_opens_scope, acpi_ut_get_type_name(type));
798 if (!acpi_ut_valid_object_type(type)) {
800 /* type code out of range */
802 ACPI_WARNING((AE_INFO, "Invalid Object Type %X", type));
803 return_UINT32(ACPI_NS_NORMAL);
806 return_UINT32(((u32) acpi_gbl_ns_properties[type]) & ACPI_NS_NEWSCOPE);
809 /*******************************************************************************
811 * FUNCTION: acpi_ns_get_node
813 * PARAMETERS: *Pathname - Name to be found, in external (ASL) format. The
814 * \ (backslash) and ^ (carat) prefixes, and the
815 * . (period) to separate segments are supported.
816 * prefix_node - Root of subtree to be searched, or NS_ALL for the
817 * root of the name space. If Name is fully
818 * qualified (first s8 is '\'), the passed value
819 * of Scope will not be accessed.
820 * Flags - Used to indicate whether to perform upsearch or
821 * not.
822 * return_node - Where the Node is returned
824 * DESCRIPTION: Look up a name relative to a given scope and return the
825 * corresponding Node. NOTE: Scope can be null.
827 * MUTEX: Locks namespace
829 ******************************************************************************/
831 acpi_status
832 acpi_ns_get_node(struct acpi_namespace_node *prefix_node,
833 const char *pathname,
834 u32 flags, struct acpi_namespace_node **return_node)
836 union acpi_generic_state scope_info;
837 acpi_status status;
838 char *internal_path;
840 ACPI_FUNCTION_TRACE_PTR(ns_get_node, ACPI_CAST_PTR(char, pathname));
842 if (!pathname) {
843 *return_node = prefix_node;
844 if (!prefix_node) {
845 *return_node = acpi_gbl_root_node;
847 return_ACPI_STATUS(AE_OK);
850 /* Convert path to internal representation */
852 status = acpi_ns_internalize_name(pathname, &internal_path);
853 if (ACPI_FAILURE(status)) {
854 return_ACPI_STATUS(status);
857 /* Must lock namespace during lookup */
859 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
860 if (ACPI_FAILURE(status)) {
861 goto cleanup;
864 /* Setup lookup scope (search starting point) */
866 scope_info.scope.node = prefix_node;
868 /* Lookup the name in the namespace */
870 status = acpi_ns_lookup(&scope_info, internal_path, ACPI_TYPE_ANY,
871 ACPI_IMODE_EXECUTE,
872 (flags | ACPI_NS_DONT_OPEN_SCOPE), NULL,
873 return_node);
874 if (ACPI_FAILURE(status)) {
875 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "%s, %s\n",
876 pathname, acpi_format_exception(status)));
879 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
881 cleanup:
882 ACPI_FREE(internal_path);
883 return_ACPI_STATUS(status);
886 /*******************************************************************************
888 * FUNCTION: acpi_ns_get_parent_node
890 * PARAMETERS: Node - Current table entry
892 * RETURN: Parent entry of the given entry
894 * DESCRIPTION: Obtain the parent entry for a given entry in the namespace.
896 ******************************************************************************/
898 struct acpi_namespace_node *acpi_ns_get_parent_node(struct acpi_namespace_node
899 *node)
901 ACPI_FUNCTION_ENTRY();
903 if (!node) {
904 return (NULL);
908 * Walk to the end of this peer list. The last entry is marked with a flag
909 * and the peer pointer is really a pointer back to the parent. This saves
910 * putting a parent back pointer in each and every named object!
912 while (!(node->flags & ANOBJ_END_OF_PEER_LIST)) {
913 node = node->peer;
916 return (node->peer);
919 /*******************************************************************************
921 * FUNCTION: acpi_ns_get_next_valid_node
923 * PARAMETERS: Node - Current table entry
925 * RETURN: Next valid Node in the linked node list. NULL if no more valid
926 * nodes.
928 * DESCRIPTION: Find the next valid node within a name table.
929 * Useful for implementing NULL-end-of-list loops.
931 ******************************************************************************/
933 struct acpi_namespace_node *acpi_ns_get_next_valid_node(struct
934 acpi_namespace_node
935 *node)
938 /* If we are at the end of this peer list, return NULL */
940 if (node->flags & ANOBJ_END_OF_PEER_LIST) {
941 return NULL;
944 /* Otherwise just return the next peer */
946 return (node->peer);
949 #ifdef ACPI_OBSOLETE_FUNCTIONS
950 /*******************************************************************************
952 * FUNCTION: acpi_ns_find_parent_name
954 * PARAMETERS: *child_node - Named Obj whose name is to be found
956 * RETURN: The ACPI name
958 * DESCRIPTION: Search for the given obj in its parent scope and return the
959 * name segment, or "????" if the parent name can't be found
960 * (which "should not happen").
962 ******************************************************************************/
964 acpi_name acpi_ns_find_parent_name(struct acpi_namespace_node * child_node)
966 struct acpi_namespace_node *parent_node;
968 ACPI_FUNCTION_TRACE(ns_find_parent_name);
970 if (child_node) {
972 /* Valid entry. Get the parent Node */
974 parent_node = acpi_ns_get_parent_node(child_node);
975 if (parent_node) {
976 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
977 "Parent of %p [%4.4s] is %p [%4.4s]\n",
978 child_node,
979 acpi_ut_get_node_name(child_node),
980 parent_node,
981 acpi_ut_get_node_name(parent_node)));
983 if (parent_node->name.integer) {
984 return_VALUE((acpi_name) parent_node->name.
985 integer);
989 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
990 "Unable to find parent of %p (%4.4s)\n",
991 child_node,
992 acpi_ut_get_node_name(child_node)));
995 return_VALUE(ACPI_UNKNOWN_NAME);
997 #endif