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[ACPI] Lindent all ACPI files
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / acpi / namespace / nsutils.c
1 /******************************************************************************
2 *
3 * Module Name: nsutils - Utilities for accessing ACPI namespace, accessing
4 * parents and siblings and Scope manipulation
5 *
6 *****************************************************************************/
7
8 /*
9 * Copyright (C) 2000 - 2005, R. Byron Moore
10 * All rights reserved.
11 *
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.
26 *
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.
30 *
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.
43 */
44
45 #include <acpi/acpi.h>
46 #include <acpi/acnamesp.h>
47 #include <acpi/amlcode.h>
48 #include <acpi/actables.h>
49
50 #define _COMPONENT ACPI_NAMESPACE
51 ACPI_MODULE_NAME("nsutils")
52
53 /* Local prototypes */
54 static u8 acpi_ns_valid_path_separator(char sep);
55
56 #ifdef ACPI_OBSOLETE_FUNCTIONS
57 acpi_name acpi_ns_find_parent_name(struct acpi_namespace_node *node_to_search);
58 #endif
59
60 /*******************************************************************************
61 *
62 * FUNCTION: acpi_ns_report_error
63 *
64 * PARAMETERS: module_name - Caller's module name (for error output)
65 * line_number - Caller's line number (for error output)
66 * component_id - Caller's component ID (for error output)
67 * internal_name - Name or path of the namespace node
68 * lookup_status - Exception code from NS lookup
69 *
70 * RETURN: None
71 *
72 * DESCRIPTION: Print warning message with full pathname
73 *
74 ******************************************************************************/
75
76 void
77 acpi_ns_report_error(char *module_name,
78 u32 line_number,
79 u32 component_id,
80 char *internal_name, acpi_status lookup_status)
81 {
82 acpi_status status;
83 char *name = NULL;
84
85 acpi_os_printf("%8s-%04d: *** Error: Looking up ",
86 module_name, line_number);
87
88 if (lookup_status == AE_BAD_CHARACTER) {
89 /* There is a non-ascii character in the name */
90
91 acpi_os_printf("[0x%4.4X] (NON-ASCII)\n",
92 *(ACPI_CAST_PTR(u32, internal_name)));
93 } else {
94 /* Convert path to external format */
95
96 status = acpi_ns_externalize_name(ACPI_UINT32_MAX,
97 internal_name, NULL, &name);
98
99 /* Print target name */
100
101 if (ACPI_SUCCESS(status)) {
102 acpi_os_printf("[%s]", name);
103 } else {
104 acpi_os_printf("[COULD NOT EXTERNALIZE NAME]");
105 }
106
107 if (name) {
108 ACPI_MEM_FREE(name);
109 }
110 }
111
112 acpi_os_printf(" in namespace, %s\n",
113 acpi_format_exception(lookup_status));
114 }
115
116 /*******************************************************************************
117 *
118 * FUNCTION: acpi_ns_report_method_error
119 *
120 * PARAMETERS: module_name - Caller's module name (for error output)
121 * line_number - Caller's line number (for error output)
122 * component_id - Caller's component ID (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
126 * method_status - Execution status
127 *
128 * RETURN: None
129 *
130 * DESCRIPTION: Print warning message with full pathname
131 *
132 ******************************************************************************/
133
134 void
135 acpi_ns_report_method_error(char *module_name,
136 u32 line_number,
137 u32 component_id,
138 char *message,
139 struct acpi_namespace_node *prefix_node,
140 char *path, acpi_status method_status)
141 {
142 acpi_status status;
143 struct acpi_namespace_node *node = prefix_node;
144
145 if (path) {
146 status = acpi_ns_get_node_by_path(path, prefix_node,
147 ACPI_NS_NO_UPSEARCH, &node);
148 if (ACPI_FAILURE(status)) {
149 acpi_os_printf
150 ("report_method_error: Could not get node\n");
151 return;
152 }
153 }
154
155 acpi_os_printf("%8s-%04d: *** Error: ", module_name, line_number);
156 acpi_ns_print_node_pathname(node, message);
157 acpi_os_printf(", %s\n", acpi_format_exception(method_status));
158 }
159
160 /*******************************************************************************
161 *
162 * FUNCTION: acpi_ns_print_node_pathname
163 *
164 * PARAMETERS: Node - Object
165 * Message - Prefix message
166 *
167 * DESCRIPTION: Print an object's full namespace pathname
168 * Manages allocation/freeing of a pathname buffer
169 *
170 ******************************************************************************/
171
172 void
173 acpi_ns_print_node_pathname(struct acpi_namespace_node *node, char *message)
174 {
175 struct acpi_buffer buffer;
176 acpi_status status;
177
178 if (!node) {
179 acpi_os_printf("[NULL NAME]");
180 return;
181 }
182
183 /* Convert handle to full pathname and print it (with supplied message) */
184
185 buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
186
187 status = acpi_ns_handle_to_pathname(node, &buffer);
188 if (ACPI_SUCCESS(status)) {
189 if (message) {
190 acpi_os_printf("%s ", message);
191 }
192
193 acpi_os_printf("[%s] (Node %p)", (char *)buffer.pointer, node);
194 ACPI_MEM_FREE(buffer.pointer);
195 }
196 }
197
198 /*******************************************************************************
199 *
200 * FUNCTION: acpi_ns_valid_root_prefix
201 *
202 * PARAMETERS: Prefix - Character to be checked
203 *
204 * RETURN: TRUE if a valid prefix
205 *
206 * DESCRIPTION: Check if a character is a valid ACPI Root prefix
207 *
208 ******************************************************************************/
209
210 u8 acpi_ns_valid_root_prefix(char prefix)
211 {
212
213 return ((u8) (prefix == '\\'));
214 }
215
216 /*******************************************************************************
217 *
218 * FUNCTION: acpi_ns_valid_path_separator
219 *
220 * PARAMETERS: Sep - Character to be checked
221 *
222 * RETURN: TRUE if a valid path separator
223 *
224 * DESCRIPTION: Check if a character is a valid ACPI path separator
225 *
226 ******************************************************************************/
227
228 static u8 acpi_ns_valid_path_separator(char sep)
229 {
230
231 return ((u8) (sep == '.'));
232 }
233
234 /*******************************************************************************
235 *
236 * FUNCTION: acpi_ns_get_type
237 *
238 * PARAMETERS: Node - Parent Node to be examined
239 *
240 * RETURN: Type field from Node whose handle is passed
241 *
242 * DESCRIPTION: Return the type of a Namespace node
243 *
244 ******************************************************************************/
245
246 acpi_object_type acpi_ns_get_type(struct acpi_namespace_node * node)
247 {
248 ACPI_FUNCTION_TRACE("ns_get_type");
249
250 if (!node) {
251 ACPI_REPORT_WARNING(("ns_get_type: Null Node input pointer\n"));
252 return_VALUE(ACPI_TYPE_ANY);
253 }
254
255 return_VALUE((acpi_object_type) node->type);
256 }
257
258 /*******************************************************************************
259 *
260 * FUNCTION: acpi_ns_local
261 *
262 * PARAMETERS: Type - A namespace object type
263 *
264 * RETURN: LOCAL if names must be found locally in objects of the
265 * passed type, 0 if enclosing scopes should be searched
266 *
267 * DESCRIPTION: Returns scope rule for the given object type.
268 *
269 ******************************************************************************/
270
271 u32 acpi_ns_local(acpi_object_type type)
272 {
273 ACPI_FUNCTION_TRACE("ns_local");
274
275 if (!acpi_ut_valid_object_type(type)) {
276 /* Type code out of range */
277
278 ACPI_REPORT_WARNING(("ns_local: Invalid Object Type\n"));
279 return_VALUE(ACPI_NS_NORMAL);
280 }
281
282 return_VALUE((u32) acpi_gbl_ns_properties[type] & ACPI_NS_LOCAL);
283 }
284
285 /*******************************************************************************
286 *
287 * FUNCTION: acpi_ns_get_internal_name_length
288 *
289 * PARAMETERS: Info - Info struct initialized with the
290 * external name pointer.
291 *
292 * RETURN: None
293 *
294 * DESCRIPTION: Calculate the length of the internal (AML) namestring
295 * corresponding to the external (ASL) namestring.
296 *
297 ******************************************************************************/
298
299 void acpi_ns_get_internal_name_length(struct acpi_namestring_info *info)
300 {
301 char *next_external_char;
302 u32 i;
303
304 ACPI_FUNCTION_ENTRY();
305
306 next_external_char = info->external_name;
307 info->num_carats = 0;
308 info->num_segments = 0;
309 info->fully_qualified = FALSE;
310
311 /*
312 * For the internal name, the required length is 4 bytes per segment, plus
313 * 1 each for root_prefix, multi_name_prefix_op, segment count, trailing null
314 * (which is not really needed, but no there's harm in putting it there)
315 *
316 * strlen() + 1 covers the first name_seg, which has no path separator
317 */
318 if (acpi_ns_valid_root_prefix(next_external_char[0])) {
319 info->fully_qualified = TRUE;
320 next_external_char++;
321 } else {
322 /*
323 * Handle Carat prefixes
324 */
325 while (*next_external_char == '^') {
326 info->num_carats++;
327 next_external_char++;
328 }
329 }
330
331 /*
332 * Determine the number of ACPI name "segments" by counting the number of
333 * path separators within the string. Start with one segment since the
334 * segment count is [(# separators) + 1], and zero separators is ok.
335 */
336 if (*next_external_char) {
337 info->num_segments = 1;
338 for (i = 0; next_external_char[i]; i++) {
339 if (acpi_ns_valid_path_separator(next_external_char[i])) {
340 info->num_segments++;
341 }
342 }
343 }
344
345 info->length = (ACPI_NAME_SIZE * info->num_segments) +
346 4 + info->num_carats;
347
348 info->next_external_char = next_external_char;
349 }
350
351 /*******************************************************************************
352 *
353 * FUNCTION: acpi_ns_build_internal_name
354 *
355 * PARAMETERS: Info - Info struct fully initialized
356 *
357 * RETURN: Status
358 *
359 * DESCRIPTION: Construct the internal (AML) namestring
360 * corresponding to the external (ASL) namestring.
361 *
362 ******************************************************************************/
363
364 acpi_status acpi_ns_build_internal_name(struct acpi_namestring_info *info)
365 {
366 u32 num_segments = info->num_segments;
367 char *internal_name = info->internal_name;
368 char *external_name = info->next_external_char;
369 char *result = NULL;
370 acpi_native_uint i;
371
372 ACPI_FUNCTION_TRACE("ns_build_internal_name");
373
374 /* Setup the correct prefixes, counts, and pointers */
375
376 if (info->fully_qualified) {
377 internal_name[0] = '\\';
378
379 if (num_segments <= 1) {
380 result = &internal_name[1];
381 } else if (num_segments == 2) {
382 internal_name[1] = AML_DUAL_NAME_PREFIX;
383 result = &internal_name[2];
384 } else {
385 internal_name[1] = AML_MULTI_NAME_PREFIX_OP;
386 internal_name[2] = (char)num_segments;
387 result = &internal_name[3];
388 }
389 } else {
390 /*
391 * Not fully qualified.
392 * Handle Carats first, then append the name segments
393 */
394 i = 0;
395 if (info->num_carats) {
396 for (i = 0; i < info->num_carats; i++) {
397 internal_name[i] = '^';
398 }
399 }
400
401 if (num_segments <= 1) {
402 result = &internal_name[i];
403 } else if (num_segments == 2) {
404 internal_name[i] = AML_DUAL_NAME_PREFIX;
405 result = &internal_name[(acpi_native_uint) (i + 1)];
406 } else {
407 internal_name[i] = AML_MULTI_NAME_PREFIX_OP;
408 internal_name[(acpi_native_uint) (i + 1)] =
409 (char)num_segments;
410 result = &internal_name[(acpi_native_uint) (i + 2)];
411 }
412 }
413
414 /* Build the name (minus path separators) */
415
416 for (; num_segments; num_segments--) {
417 for (i = 0; i < ACPI_NAME_SIZE; i++) {
418 if (acpi_ns_valid_path_separator(*external_name) ||
419 (*external_name == 0)) {
420 /* Pad the segment with underscore(s) if segment is short */
421
422 result[i] = '_';
423 } else {
424 /* Convert the character to uppercase and save it */
425
426 result[i] =
427 (char)ACPI_TOUPPER((int)*external_name);
428 external_name++;
429 }
430 }
431
432 /* Now we must have a path separator, or the pathname is bad */
433
434 if (!acpi_ns_valid_path_separator(*external_name) &&
435 (*external_name != 0)) {
436 return_ACPI_STATUS(AE_BAD_PARAMETER);
437 }
438
439 /* Move on the next segment */
440
441 external_name++;
442 result += ACPI_NAME_SIZE;
443 }
444
445 /* Terminate the string */
446
447 *result = 0;
448
449 if (info->fully_qualified) {
450 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
451 "Returning [%p] (abs) \"\\%s\"\n",
452 internal_name, internal_name));
453 } else {
454 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Returning [%p] (rel) \"%s\"\n",
455 internal_name, internal_name));
456 }
457
458 return_ACPI_STATUS(AE_OK);
459 }
460
461 /*******************************************************************************
462 *
463 * FUNCTION: acpi_ns_internalize_name
464 *
465 * PARAMETERS: *external_name - External representation of name
466 * **Converted Name - Where to return the resulting
467 * internal represention of the name
468 *
469 * RETURN: Status
470 *
471 * DESCRIPTION: Convert an external representation (e.g. "\_PR_.CPU0")
472 * to internal form (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
473 *
474 *******************************************************************************/
475
476 acpi_status acpi_ns_internalize_name(char *external_name, char **converted_name)
477 {
478 char *internal_name;
479 struct acpi_namestring_info info;
480 acpi_status status;
481
482 ACPI_FUNCTION_TRACE("ns_internalize_name");
483
484 if ((!external_name) || (*external_name == 0) || (!converted_name)) {
485 return_ACPI_STATUS(AE_BAD_PARAMETER);
486 }
487
488 /* Get the length of the new internal name */
489
490 info.external_name = external_name;
491 acpi_ns_get_internal_name_length(&info);
492
493 /* We need a segment to store the internal name */
494
495 internal_name = ACPI_MEM_CALLOCATE(info.length);
496 if (!internal_name) {
497 return_ACPI_STATUS(AE_NO_MEMORY);
498 }
499
500 /* Build the name */
501
502 info.internal_name = internal_name;
503 status = acpi_ns_build_internal_name(&info);
504 if (ACPI_FAILURE(status)) {
505 ACPI_MEM_FREE(internal_name);
506 return_ACPI_STATUS(status);
507 }
508
509 *converted_name = internal_name;
510 return_ACPI_STATUS(AE_OK);
511 }
512
513 /*******************************************************************************
514 *
515 * FUNCTION: acpi_ns_externalize_name
516 *
517 * PARAMETERS: internal_name_length - Lenth of the internal name below
518 * internal_name - Internal representation of name
519 * converted_name_length - Where the length is returned
520 * converted_name - Where the resulting external name
521 * is returned
522 *
523 * RETURN: Status
524 *
525 * DESCRIPTION: Convert internal name (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
526 * to its external (printable) form (e.g. "\_PR_.CPU0")
527 *
528 ******************************************************************************/
529
530 acpi_status
531 acpi_ns_externalize_name(u32 internal_name_length,
532 char *internal_name,
533 u32 * converted_name_length, char **converted_name)
534 {
535 acpi_native_uint names_index = 0;
536 acpi_native_uint num_segments = 0;
537 acpi_native_uint required_length;
538 acpi_native_uint prefix_length = 0;
539 acpi_native_uint i = 0;
540 acpi_native_uint j = 0;
541
542 ACPI_FUNCTION_TRACE("ns_externalize_name");
543
544 if (!internal_name_length || !internal_name || !converted_name) {
545 return_ACPI_STATUS(AE_BAD_PARAMETER);
546 }
547
548 /*
549 * Check for a prefix (one '\' | one or more '^').
550 */
551 switch (internal_name[0]) {
552 case '\\':
553 prefix_length = 1;
554 break;
555
556 case '^':
557 for (i = 0; i < internal_name_length; i++) {
558 if (internal_name[i] == '^') {
559 prefix_length = i + 1;
560 } else {
561 break;
562 }
563 }
564
565 if (i == internal_name_length) {
566 prefix_length = i;
567 }
568
569 break;
570
571 default:
572 break;
573 }
574
575 /*
576 * Check for object names. Note that there could be 0-255 of these
577 * 4-byte elements.
578 */
579 if (prefix_length < internal_name_length) {
580 switch (internal_name[prefix_length]) {
581 case AML_MULTI_NAME_PREFIX_OP:
582
583 /* <count> 4-byte names */
584
585 names_index = prefix_length + 2;
586 num_segments = (acpi_native_uint) (u8)
587 internal_name[(acpi_native_uint)
588 (prefix_length + 1)];
589 break;
590
591 case AML_DUAL_NAME_PREFIX:
592
593 /* Two 4-byte names */
594
595 names_index = prefix_length + 1;
596 num_segments = 2;
597 break;
598
599 case 0:
600
601 /* null_name */
602
603 names_index = 0;
604 num_segments = 0;
605 break;
606
607 default:
608
609 /* one 4-byte name */
610
611 names_index = prefix_length;
612 num_segments = 1;
613 break;
614 }
615 }
616
617 /*
618 * Calculate the length of converted_name, which equals the length
619 * of the prefix, length of all object names, length of any required
620 * punctuation ('.') between object names, plus the NULL terminator.
621 */
622 required_length = prefix_length + (4 * num_segments) +
623 ((num_segments > 0) ? (num_segments - 1) : 0) + 1;
624
625 /*
626 * Check to see if we're still in bounds. If not, there's a problem
627 * with internal_name (invalid format).
628 */
629 if (required_length > internal_name_length) {
630 ACPI_REPORT_ERROR(("ns_externalize_name: Invalid internal name\n"));
631 return_ACPI_STATUS(AE_BAD_PATHNAME);
632 }
633
634 /*
635 * Build converted_name
636 */
637 *converted_name = ACPI_MEM_CALLOCATE(required_length);
638 if (!(*converted_name)) {
639 return_ACPI_STATUS(AE_NO_MEMORY);
640 }
641
642 j = 0;
643
644 for (i = 0; i < prefix_length; i++) {
645 (*converted_name)[j++] = internal_name[i];
646 }
647
648 if (num_segments > 0) {
649 for (i = 0; i < num_segments; i++) {
650 if (i > 0) {
651 (*converted_name)[j++] = '.';
652 }
653
654 (*converted_name)[j++] = internal_name[names_index++];
655 (*converted_name)[j++] = internal_name[names_index++];
656 (*converted_name)[j++] = internal_name[names_index++];
657 (*converted_name)[j++] = internal_name[names_index++];
658 }
659 }
660
661 if (converted_name_length) {
662 *converted_name_length = (u32) required_length;
663 }
664
665 return_ACPI_STATUS(AE_OK);
666 }
667
668 /*******************************************************************************
669 *
670 * FUNCTION: acpi_ns_map_handle_to_node
671 *
672 * PARAMETERS: Handle - Handle to be converted to an Node
673 *
674 * RETURN: A Name table entry pointer
675 *
676 * DESCRIPTION: Convert a namespace handle to a real Node
677 *
678 * Note: Real integer handles would allow for more verification
679 * and keep all pointers within this subsystem - however this introduces
680 * more (and perhaps unnecessary) overhead.
681 *
682 ******************************************************************************/
683
684 struct acpi_namespace_node *acpi_ns_map_handle_to_node(acpi_handle handle)
685 {
686
687 ACPI_FUNCTION_ENTRY();
688
689 /*
690 * Simple implementation.
691 */
692 if (!handle) {
693 return (NULL);
694 }
695
696 if (handle == ACPI_ROOT_OBJECT) {
697 return (acpi_gbl_root_node);
698 }
699
700 /* We can at least attempt to verify the handle */
701
702 if (ACPI_GET_DESCRIPTOR_TYPE(handle) != ACPI_DESC_TYPE_NAMED) {
703 return (NULL);
704 }
705
706 return ((struct acpi_namespace_node *)handle);
707 }
708
709 /*******************************************************************************
710 *
711 * FUNCTION: acpi_ns_convert_entry_to_handle
712 *
713 * PARAMETERS: Node - Node to be converted to a Handle
714 *
715 * RETURN: A user handle
716 *
717 * DESCRIPTION: Convert a real Node to a namespace handle
718 *
719 ******************************************************************************/
720
721 acpi_handle acpi_ns_convert_entry_to_handle(struct acpi_namespace_node *node)
722 {
723
724 /*
725 * Simple implementation for now;
726 */
727 return ((acpi_handle) node);
728
729 /* Example future implementation ---------------------
730
731 if (!Node)
732 {
733 return (NULL);
734 }
735
736 if (Node == acpi_gbl_root_node)
737 {
738 return (ACPI_ROOT_OBJECT);
739 }
740
741 return ((acpi_handle) Node);
742 ------------------------------------------------------*/
743 }
744
745 /*******************************************************************************
746 *
747 * FUNCTION: acpi_ns_terminate
748 *
749 * PARAMETERS: none
750 *
751 * RETURN: none
752 *
753 * DESCRIPTION: free memory allocated for namespace and ACPI table storage.
754 *
755 ******************************************************************************/
756
757 void acpi_ns_terminate(void)
758 {
759 union acpi_operand_object *obj_desc;
760
761 ACPI_FUNCTION_TRACE("ns_terminate");
762
763 /*
764 * 1) Free the entire namespace -- all nodes and objects
765 *
766 * Delete all object descriptors attached to namepsace nodes
767 */
768 acpi_ns_delete_namespace_subtree(acpi_gbl_root_node);
769
770 /* Detach any objects attached to the root */
771
772 obj_desc = acpi_ns_get_attached_object(acpi_gbl_root_node);
773 if (obj_desc) {
774 acpi_ns_detach_object(acpi_gbl_root_node);
775 }
776
777 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Namespace freed\n"));
778
779 /*
780 * 2) Now we can delete the ACPI tables
781 */
782 acpi_tb_delete_all_tables();
783 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "ACPI Tables freed\n"));
784
785 return_VOID;
786 }
787
788 /*******************************************************************************
789 *
790 * FUNCTION: acpi_ns_opens_scope
791 *
792 * PARAMETERS: Type - A valid namespace type
793 *
794 * RETURN: NEWSCOPE if the passed type "opens a name scope" according
795 * to the ACPI specification, else 0
796 *
797 ******************************************************************************/
798
799 u32 acpi_ns_opens_scope(acpi_object_type type)
800 {
801 ACPI_FUNCTION_TRACE_STR("ns_opens_scope", acpi_ut_get_type_name(type));
802
803 if (!acpi_ut_valid_object_type(type)) {
804 /* type code out of range */
805
806 ACPI_REPORT_WARNING(("ns_opens_scope: Invalid Object Type %X\n",
807 type));
808 return_VALUE(ACPI_NS_NORMAL);
809 }
810
811 return_VALUE(((u32) acpi_gbl_ns_properties[type]) & ACPI_NS_NEWSCOPE);
812 }
813
814 /*******************************************************************************
815 *
816 * FUNCTION: acpi_ns_get_node_by_path
817 *
818 * PARAMETERS: *Pathname - Name to be found, in external (ASL) format. The
819 * \ (backslash) and ^ (carat) prefixes, and the
820 * . (period) to separate segments are supported.
821 * start_node - Root of subtree to be searched, or NS_ALL for the
822 * root of the name space. If Name is fully
823 * qualified (first s8 is '\'), the passed value
824 * of Scope will not be accessed.
825 * Flags - Used to indicate whether to perform upsearch or
826 * not.
827 * return_node - Where the Node is returned
828 *
829 * DESCRIPTION: Look up a name relative to a given scope and return the
830 * corresponding Node. NOTE: Scope can be null.
831 *
832 * MUTEX: Locks namespace
833 *
834 ******************************************************************************/
835
836 acpi_status
837 acpi_ns_get_node_by_path(char *pathname,
838 struct acpi_namespace_node *start_node,
839 u32 flags, struct acpi_namespace_node **return_node)
840 {
841 union acpi_generic_state scope_info;
842 acpi_status status;
843 char *internal_path = NULL;
844
845 ACPI_FUNCTION_TRACE_PTR("ns_get_node_by_path", pathname);
846
847 if (pathname) {
848 /* Convert path to internal representation */
849
850 status = acpi_ns_internalize_name(pathname, &internal_path);
851 if (ACPI_FAILURE(status)) {
852 return_ACPI_STATUS(status);
853 }
854 }
855
856 /* Must lock namespace during lookup */
857
858 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
859 if (ACPI_FAILURE(status)) {
860 goto cleanup;
861 }
862
863 /* Setup lookup scope (search starting point) */
864
865 scope_info.scope.node = start_node;
866
867 /* Lookup the name in the namespace */
868
869 status = acpi_ns_lookup(&scope_info, internal_path,
870 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
871 (flags | ACPI_NS_DONT_OPEN_SCOPE),
872 NULL, return_node);
873 if (ACPI_FAILURE(status)) {
874 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s, %s\n",
875 internal_path,
876 acpi_format_exception(status)));
877 }
878
879 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
880
881 cleanup:
882 if (internal_path) {
883 ACPI_MEM_FREE(internal_path);
884 }
885 return_ACPI_STATUS(status);
886 }
887
888 /*******************************************************************************
889 *
890 * FUNCTION: acpi_ns_get_parent_node
891 *
892 * PARAMETERS: Node - Current table entry
893 *
894 * RETURN: Parent entry of the given entry
895 *
896 * DESCRIPTION: Obtain the parent entry for a given entry in the namespace.
897 *
898 ******************************************************************************/
899
900 struct acpi_namespace_node *acpi_ns_get_parent_node(struct acpi_namespace_node
901 *node)
902 {
903 ACPI_FUNCTION_ENTRY();
904
905 if (!node) {
906 return (NULL);
907 }
908
909 /*
910 * Walk to the end of this peer list. The last entry is marked with a flag
911 * and the peer pointer is really a pointer back to the parent. This saves
912 * putting a parent back pointer in each and every named object!
913 */
914 while (!(node->flags & ANOBJ_END_OF_PEER_LIST)) {
915 node = node->peer;
916 }
917
918 return (node->peer);
919 }
920
921 /*******************************************************************************
922 *
923 * FUNCTION: acpi_ns_get_next_valid_node
924 *
925 * PARAMETERS: Node - Current table entry
926 *
927 * RETURN: Next valid Node in the linked node list. NULL if no more valid
928 * nodes.
929 *
930 * DESCRIPTION: Find the next valid node within a name table.
931 * Useful for implementing NULL-end-of-list loops.
932 *
933 ******************************************************************************/
934
935 struct acpi_namespace_node *acpi_ns_get_next_valid_node(struct
936 acpi_namespace_node
937 *node)
938 {
939
940 /* If we are at the end of this peer list, return NULL */
941
942 if (node->flags & ANOBJ_END_OF_PEER_LIST) {
943 return NULL;
944 }
945
946 /* Otherwise just return the next peer */
947
948 return (node->peer);
949 }
950
951 #ifdef ACPI_OBSOLETE_FUNCTIONS
952 /*******************************************************************************
953 *
954 * FUNCTION: acpi_ns_find_parent_name
955 *
956 * PARAMETERS: *child_node - Named Obj whose name is to be found
957 *
958 * RETURN: The ACPI name
959 *
960 * DESCRIPTION: Search for the given obj in its parent scope and return the
961 * name segment, or "????" if the parent name can't be found
962 * (which "should not happen").
963 *
964 ******************************************************************************/
965
966 acpi_name acpi_ns_find_parent_name(struct acpi_namespace_node * child_node)
967 {
968 struct acpi_namespace_node *parent_node;
969
970 ACPI_FUNCTION_TRACE("ns_find_parent_name");
971
972 if (child_node) {
973 /* Valid entry. Get the parent Node */
974
975 parent_node = acpi_ns_get_parent_node(child_node);
976 if (parent_node) {
977 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
978 "Parent of %p [%4.4s] is %p [%4.4s]\n",
979 child_node,
980 acpi_ut_get_node_name(child_node),
981 parent_node,
982 acpi_ut_get_node_name(parent_node)));
983
984 if (parent_node->name.integer) {
985 return_VALUE((acpi_name) parent_node->name.
986 integer);
987 }
988 }
989
990 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
991 "Unable to find parent of %p (%4.4s)\n",
992 child_node,
993 acpi_ut_get_node_name(child_node)));
994 }
995
996 return_VALUE(ACPI_UNKNOWN_NAME);
997 }
998 #endif
kernel source for telekom puls (alcatel/mediatek)