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ACPI: ACPICA 20060421
[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 - 2006, 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 * internal_name - Name or path of the namespace node
67 * lookup_status - Exception code from NS lookup
68 *
69 * RETURN: None
70 *
71 * DESCRIPTION: Print warning message with full pathname
72 *
73 ******************************************************************************/
74
75 void
76 acpi_ns_report_error(char *module_name,
77 u32 line_number,
78 char *internal_name, acpi_status lookup_status)
79 {
80 acpi_status status;
81 u32 bad_name;
82 char *name = NULL;
83
84 acpi_os_printf("ACPI Error (%s-%04d): ", module_name, line_number);
85
86 if (lookup_status == AE_BAD_CHARACTER) {
87
88 /* There is a non-ascii character in the name */
89
90 ACPI_MOVE_32_TO_32(&bad_name, internal_name);
91 acpi_os_printf("[0x%4.4X] (NON-ASCII)", bad_name);
92 } else {
93 /* Convert path to external format */
94
95 status = acpi_ns_externalize_name(ACPI_UINT32_MAX,
96 internal_name, NULL, &name);
97
98 /* Print target name */
99
100 if (ACPI_SUCCESS(status)) {
101 acpi_os_printf("[%s]", name);
102 } else {
103 acpi_os_printf("[COULD NOT EXTERNALIZE NAME]");
104 }
105
106 if (name) {
107 ACPI_FREE(name);
108 }
109 }
110
111 acpi_os_printf(" Namespace lookup failure, %s\n",
112 acpi_format_exception(lookup_status));
113 }
114
115 /*******************************************************************************
116 *
117 * FUNCTION: acpi_ns_report_method_error
118 *
119 * PARAMETERS: module_name - Caller's module name (for error output)
120 * line_number - Caller's line number (for error output)
121 * Message - Error message to use on failure
122 * prefix_node - Prefix relative to the path
123 * Path - Path to the node (optional)
124 * method_status - Execution status
125 *
126 * RETURN: None
127 *
128 * DESCRIPTION: Print warning message with full pathname
129 *
130 ******************************************************************************/
131
132 void
133 acpi_ns_report_method_error(char *module_name,
134 u32 line_number,
135 char *message,
136 struct acpi_namespace_node *prefix_node,
137 char *path, acpi_status method_status)
138 {
139 acpi_status status;
140 struct acpi_namespace_node *node = prefix_node;
141
142 acpi_os_printf("ACPI Error (%s-%04d): ", module_name, line_number);
143
144 if (path) {
145 status = acpi_ns_get_node_by_path(path, prefix_node,
146 ACPI_NS_NO_UPSEARCH, &node);
147 if (ACPI_FAILURE(status)) {
148 acpi_os_printf("[Could not get node by pathname]");
149 }
150 }
151
152 acpi_ns_print_node_pathname(node, message);
153 acpi_os_printf(", %s\n", acpi_format_exception(method_status));
154 }
155
156 /*******************************************************************************
157 *
158 * FUNCTION: acpi_ns_print_node_pathname
159 *
160 * PARAMETERS: Node - Object
161 * Message - Prefix message
162 *
163 * DESCRIPTION: Print an object's full namespace pathname
164 * Manages allocation/freeing of a pathname buffer
165 *
166 ******************************************************************************/
167
168 void
169 acpi_ns_print_node_pathname(struct acpi_namespace_node *node, char *message)
170 {
171 struct acpi_buffer buffer;
172 acpi_status status;
173
174 if (!node) {
175 acpi_os_printf("[NULL NAME]");
176 return;
177 }
178
179 /* Convert handle to full pathname and print it (with supplied message) */
180
181 buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
182
183 status = acpi_ns_handle_to_pathname(node, &buffer);
184 if (ACPI_SUCCESS(status)) {
185 if (message) {
186 acpi_os_printf("%s ", message);
187 }
188
189 acpi_os_printf("[%s] (Node %p)", (char *)buffer.pointer, node);
190 ACPI_FREE(buffer.pointer);
191 }
192 }
193
194 /*******************************************************************************
195 *
196 * FUNCTION: acpi_ns_valid_root_prefix
197 *
198 * PARAMETERS: Prefix - Character to be checked
199 *
200 * RETURN: TRUE if a valid prefix
201 *
202 * DESCRIPTION: Check if a character is a valid ACPI Root prefix
203 *
204 ******************************************************************************/
205
206 u8 acpi_ns_valid_root_prefix(char prefix)
207 {
208
209 return ((u8) (prefix == '\\'));
210 }
211
212 /*******************************************************************************
213 *
214 * FUNCTION: acpi_ns_valid_path_separator
215 *
216 * PARAMETERS: Sep - Character to be checked
217 *
218 * RETURN: TRUE if a valid path separator
219 *
220 * DESCRIPTION: Check if a character is a valid ACPI path separator
221 *
222 ******************************************************************************/
223
224 static u8 acpi_ns_valid_path_separator(char sep)
225 {
226
227 return ((u8) (sep == '.'));
228 }
229
230 /*******************************************************************************
231 *
232 * FUNCTION: acpi_ns_get_type
233 *
234 * PARAMETERS: Node - Parent Node to be examined
235 *
236 * RETURN: Type field from Node whose handle is passed
237 *
238 * DESCRIPTION: Return the type of a Namespace node
239 *
240 ******************************************************************************/
241
242 acpi_object_type acpi_ns_get_type(struct acpi_namespace_node * node)
243 {
244 ACPI_FUNCTION_TRACE(ns_get_type);
245
246 if (!node) {
247 ACPI_WARNING((AE_INFO, "Null Node parameter"));
248 return_UINT32(ACPI_TYPE_ANY);
249 }
250
251 return_UINT32((acpi_object_type) node->type);
252 }
253
254 /*******************************************************************************
255 *
256 * FUNCTION: acpi_ns_local
257 *
258 * PARAMETERS: Type - A namespace object type
259 *
260 * RETURN: LOCAL if names must be found locally in objects of the
261 * passed type, 0 if enclosing scopes should be searched
262 *
263 * DESCRIPTION: Returns scope rule for the given object type.
264 *
265 ******************************************************************************/
266
267 u32 acpi_ns_local(acpi_object_type type)
268 {
269 ACPI_FUNCTION_TRACE(ns_local);
270
271 if (!acpi_ut_valid_object_type(type)) {
272
273 /* Type code out of range */
274
275 ACPI_WARNING((AE_INFO, "Invalid Object Type %X", type));
276 return_UINT32(ACPI_NS_NORMAL);
277 }
278
279 return_UINT32((u32) acpi_gbl_ns_properties[type] & ACPI_NS_LOCAL);
280 }
281
282 /*******************************************************************************
283 *
284 * FUNCTION: acpi_ns_get_internal_name_length
285 *
286 * PARAMETERS: Info - Info struct initialized with the
287 * external name pointer.
288 *
289 * RETURN: None
290 *
291 * DESCRIPTION: Calculate the length of the internal (AML) namestring
292 * corresponding to the external (ASL) namestring.
293 *
294 ******************************************************************************/
295
296 void acpi_ns_get_internal_name_length(struct acpi_namestring_info *info)
297 {
298 char *next_external_char;
299 u32 i;
300
301 ACPI_FUNCTION_ENTRY();
302
303 next_external_char = info->external_name;
304 info->num_carats = 0;
305 info->num_segments = 0;
306 info->fully_qualified = FALSE;
307
308 /*
309 * For the internal name, the required length is 4 bytes per segment, plus
310 * 1 each for root_prefix, multi_name_prefix_op, segment count, trailing null
311 * (which is not really needed, but no there's harm in putting it there)
312 *
313 * strlen() + 1 covers the first name_seg, which has no path separator
314 */
315 if (acpi_ns_valid_root_prefix(next_external_char[0])) {
316 info->fully_qualified = TRUE;
317 next_external_char++;
318 } else {
319 /*
320 * Handle Carat prefixes
321 */
322 while (*next_external_char == '^') {
323 info->num_carats++;
324 next_external_char++;
325 }
326 }
327
328 /*
329 * Determine the number of ACPI name "segments" by counting the number of
330 * path separators within the string. Start with one segment since the
331 * segment count is [(# separators) + 1], and zero separators is ok.
332 */
333 if (*next_external_char) {
334 info->num_segments = 1;
335 for (i = 0; next_external_char[i]; i++) {
336 if (acpi_ns_valid_path_separator(next_external_char[i])) {
337 info->num_segments++;
338 }
339 }
340 }
341
342 info->length = (ACPI_NAME_SIZE * info->num_segments) +
343 4 + info->num_carats;
344
345 info->next_external_char = next_external_char;
346 }
347
348 /*******************************************************************************
349 *
350 * FUNCTION: acpi_ns_build_internal_name
351 *
352 * PARAMETERS: Info - Info struct fully initialized
353 *
354 * RETURN: Status
355 *
356 * DESCRIPTION: Construct the internal (AML) namestring
357 * corresponding to the external (ASL) namestring.
358 *
359 ******************************************************************************/
360
361 acpi_status acpi_ns_build_internal_name(struct acpi_namestring_info *info)
362 {
363 u32 num_segments = info->num_segments;
364 char *internal_name = info->internal_name;
365 char *external_name = info->next_external_char;
366 char *result = NULL;
367 acpi_native_uint i;
368
369 ACPI_FUNCTION_TRACE(ns_build_internal_name);
370
371 /* Setup the correct prefixes, counts, and pointers */
372
373 if (info->fully_qualified) {
374 internal_name[0] = '\\';
375
376 if (num_segments <= 1) {
377 result = &internal_name[1];
378 } else if (num_segments == 2) {
379 internal_name[1] = AML_DUAL_NAME_PREFIX;
380 result = &internal_name[2];
381 } else {
382 internal_name[1] = AML_MULTI_NAME_PREFIX_OP;
383 internal_name[2] = (char)num_segments;
384 result = &internal_name[3];
385 }
386 } else {
387 /*
388 * Not fully qualified.
389 * Handle Carats first, then append the name segments
390 */
391 i = 0;
392 if (info->num_carats) {
393 for (i = 0; i < info->num_carats; i++) {
394 internal_name[i] = '^';
395 }
396 }
397
398 if (num_segments <= 1) {
399 result = &internal_name[i];
400 } else if (num_segments == 2) {
401 internal_name[i] = AML_DUAL_NAME_PREFIX;
402 result = &internal_name[(acpi_native_uint) (i + 1)];
403 } else {
404 internal_name[i] = AML_MULTI_NAME_PREFIX_OP;
405 internal_name[(acpi_native_uint) (i + 1)] =
406 (char)num_segments;
407 result = &internal_name[(acpi_native_uint) (i + 2)];
408 }
409 }
410
411 /* Build the name (minus path separators) */
412
413 for (; num_segments; num_segments--) {
414 for (i = 0; i < ACPI_NAME_SIZE; i++) {
415 if (acpi_ns_valid_path_separator(*external_name) ||
416 (*external_name == 0)) {
417
418 /* Pad the segment with underscore(s) if segment is short */
419
420 result[i] = '_';
421 } else {
422 /* Convert the character to uppercase and save it */
423
424 result[i] =
425 (char)ACPI_TOUPPER((int)*external_name);
426 external_name++;
427 }
428 }
429
430 /* Now we must have a path separator, or the pathname is bad */
431
432 if (!acpi_ns_valid_path_separator(*external_name) &&
433 (*external_name != 0)) {
434 return_ACPI_STATUS(AE_BAD_PARAMETER);
435 }
436
437 /* Move on the next segment */
438
439 external_name++;
440 result += ACPI_NAME_SIZE;
441 }
442
443 /* Terminate the string */
444
445 *result = 0;
446
447 if (info->fully_qualified) {
448 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
449 "Returning [%p] (abs) \"\\%s\"\n",
450 internal_name, internal_name));
451 } else {
452 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Returning [%p] (rel) \"%s\"\n",
453 internal_name, internal_name));
454 }
455
456 return_ACPI_STATUS(AE_OK);
457 }
458
459 /*******************************************************************************
460 *
461 * FUNCTION: acpi_ns_internalize_name
462 *
463 * PARAMETERS: *external_name - External representation of name
464 * **Converted Name - Where to return the resulting
465 * internal represention of the name
466 *
467 * RETURN: Status
468 *
469 * DESCRIPTION: Convert an external representation (e.g. "\_PR_.CPU0")
470 * to internal form (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
471 *
472 *******************************************************************************/
473
474 acpi_status acpi_ns_internalize_name(char *external_name, char **converted_name)
475 {
476 char *internal_name;
477 struct acpi_namestring_info info;
478 acpi_status status;
479
480 ACPI_FUNCTION_TRACE(ns_internalize_name);
481
482 if ((!external_name) || (*external_name == 0) || (!converted_name)) {
483 return_ACPI_STATUS(AE_BAD_PARAMETER);
484 }
485
486 /* Get the length of the new internal name */
487
488 info.external_name = external_name;
489 acpi_ns_get_internal_name_length(&info);
490
491 /* We need a segment to store the internal name */
492
493 internal_name = ACPI_ALLOCATE_ZEROED(info.length);
494 if (!internal_name) {
495 return_ACPI_STATUS(AE_NO_MEMORY);
496 }
497
498 /* Build the name */
499
500 info.internal_name = internal_name;
501 status = acpi_ns_build_internal_name(&info);
502 if (ACPI_FAILURE(status)) {
503 ACPI_FREE(internal_name);
504 return_ACPI_STATUS(status);
505 }
506
507 *converted_name = internal_name;
508 return_ACPI_STATUS(AE_OK);
509 }
510
511 /*******************************************************************************
512 *
513 * FUNCTION: acpi_ns_externalize_name
514 *
515 * PARAMETERS: internal_name_length - Lenth of the internal name below
516 * internal_name - Internal representation of name
517 * converted_name_length - Where the length is returned
518 * converted_name - Where the resulting external name
519 * is returned
520 *
521 * RETURN: Status
522 *
523 * DESCRIPTION: Convert internal name (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
524 * to its external (printable) form (e.g. "\_PR_.CPU0")
525 *
526 ******************************************************************************/
527
528 acpi_status
529 acpi_ns_externalize_name(u32 internal_name_length,
530 char *internal_name,
531 u32 * converted_name_length, char **converted_name)
532 {
533 acpi_native_uint names_index = 0;
534 acpi_native_uint num_segments = 0;
535 acpi_native_uint required_length;
536 acpi_native_uint prefix_length = 0;
537 acpi_native_uint i = 0;
538 acpi_native_uint j = 0;
539
540 ACPI_FUNCTION_TRACE(ns_externalize_name);
541
542 if (!internal_name_length || !internal_name || !converted_name) {
543 return_ACPI_STATUS(AE_BAD_PARAMETER);
544 }
545
546 /*
547 * Check for a prefix (one '\' | one or more '^').
548 */
549 switch (internal_name[0]) {
550 case '\\':
551 prefix_length = 1;
552 break;
553
554 case '^':
555 for (i = 0; i < internal_name_length; i++) {
556 if (internal_name[i] == '^') {
557 prefix_length = i + 1;
558 } else {
559 break;
560 }
561 }
562
563 if (i == internal_name_length) {
564 prefix_length = i;
565 }
566
567 break;
568
569 default:
570 break;
571 }
572
573 /*
574 * Check for object names. Note that there could be 0-255 of these
575 * 4-byte elements.
576 */
577 if (prefix_length < internal_name_length) {
578 switch (internal_name[prefix_length]) {
579 case AML_MULTI_NAME_PREFIX_OP:
580
581 /* <count> 4-byte names */
582
583 names_index = prefix_length + 2;
584 num_segments = (acpi_native_uint) (u8)
585 internal_name[(acpi_native_uint)
586 (prefix_length + 1)];
587 break;
588
589 case AML_DUAL_NAME_PREFIX:
590
591 /* Two 4-byte names */
592
593 names_index = prefix_length + 1;
594 num_segments = 2;
595 break;
596
597 case 0:
598
599 /* null_name */
600
601 names_index = 0;
602 num_segments = 0;
603 break;
604
605 default:
606
607 /* one 4-byte name */
608
609 names_index = prefix_length;
610 num_segments = 1;
611 break;
612 }
613 }
614
615 /*
616 * Calculate the length of converted_name, which equals the length
617 * of the prefix, length of all object names, length of any required
618 * punctuation ('.') between object names, plus the NULL terminator.
619 */
620 required_length = prefix_length + (4 * num_segments) +
621 ((num_segments > 0) ? (num_segments - 1) : 0) + 1;
622
623 /*
624 * Check to see if we're still in bounds. If not, there's a problem
625 * with internal_name (invalid format).
626 */
627 if (required_length > internal_name_length) {
628 ACPI_ERROR((AE_INFO, "Invalid internal name"));
629 return_ACPI_STATUS(AE_BAD_PATHNAME);
630 }
631
632 /*
633 * Build converted_name
634 */
635 *converted_name = ACPI_ALLOCATE_ZEROED(required_length);
636 if (!(*converted_name)) {
637 return_ACPI_STATUS(AE_NO_MEMORY);
638 }
639
640 j = 0;
641
642 for (i = 0; i < prefix_length; i++) {
643 (*converted_name)[j++] = internal_name[i];
644 }
645
646 if (num_segments > 0) {
647 for (i = 0; i < num_segments; i++) {
648 if (i > 0) {
649 (*converted_name)[j++] = '.';
650 }
651
652 (*converted_name)[j++] = internal_name[names_index++];
653 (*converted_name)[j++] = internal_name[names_index++];
654 (*converted_name)[j++] = internal_name[names_index++];
655 (*converted_name)[j++] = internal_name[names_index++];
656 }
657 }
658
659 if (converted_name_length) {
660 *converted_name_length = (u32) required_length;
661 }
662
663 return_ACPI_STATUS(AE_OK);
664 }
665
666 /*******************************************************************************
667 *
668 * FUNCTION: acpi_ns_map_handle_to_node
669 *
670 * PARAMETERS: Handle - Handle to be converted to an Node
671 *
672 * RETURN: A Name table entry pointer
673 *
674 * DESCRIPTION: Convert a namespace handle to a real Node
675 *
676 * Note: Real integer handles would allow for more verification
677 * and keep all pointers within this subsystem - however this introduces
678 * more (and perhaps unnecessary) overhead.
679 *
680 ******************************************************************************/
681
682 struct acpi_namespace_node *acpi_ns_map_handle_to_node(acpi_handle handle)
683 {
684
685 ACPI_FUNCTION_ENTRY();
686
687 /*
688 * Simple implementation.
689 */
690 if (!handle) {
691 return (NULL);
692 }
693
694 if (handle == ACPI_ROOT_OBJECT) {
695 return (acpi_gbl_root_node);
696 }
697
698 /* We can at least attempt to verify the handle */
699
700 if (ACPI_GET_DESCRIPTOR_TYPE(handle) != ACPI_DESC_TYPE_NAMED) {
701 return (NULL);
702 }
703
704 return ((struct acpi_namespace_node *)handle);
705 }
706
707 /*******************************************************************************
708 *
709 * FUNCTION: acpi_ns_convert_entry_to_handle
710 *
711 * PARAMETERS: Node - Node to be converted to a Handle
712 *
713 * RETURN: A user handle
714 *
715 * DESCRIPTION: Convert a real Node to a namespace handle
716 *
717 ******************************************************************************/
718
719 acpi_handle acpi_ns_convert_entry_to_handle(struct acpi_namespace_node *node)
720 {
721
722 /*
723 * Simple implementation for now;
724 */
725 return ((acpi_handle) node);
726
727 /* Example future implementation ---------------------
728
729 if (!Node)
730 {
731 return (NULL);
732 }
733
734 if (Node == acpi_gbl_root_node)
735 {
736 return (ACPI_ROOT_OBJECT);
737 }
738
739 return ((acpi_handle) Node);
740 ------------------------------------------------------*/
741 }
742
743 /*******************************************************************************
744 *
745 * FUNCTION: acpi_ns_terminate
746 *
747 * PARAMETERS: none
748 *
749 * RETURN: none
750 *
751 * DESCRIPTION: free memory allocated for namespace and ACPI table storage.
752 *
753 ******************************************************************************/
754
755 void acpi_ns_terminate(void)
756 {
757 union acpi_operand_object *obj_desc;
758
759 ACPI_FUNCTION_TRACE(ns_terminate);
760
761 /*
762 * 1) Free the entire namespace -- all nodes and objects
763 *
764 * Delete all object descriptors attached to namepsace nodes
765 */
766 acpi_ns_delete_namespace_subtree(acpi_gbl_root_node);
767
768 /* Detach any objects attached to the root */
769
770 obj_desc = acpi_ns_get_attached_object(acpi_gbl_root_node);
771 if (obj_desc) {
772 acpi_ns_detach_object(acpi_gbl_root_node);
773 }
774
775 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Namespace freed\n"));
776
777 /*
778 * 2) Now we can delete the ACPI tables
779 */
780 acpi_tb_delete_all_tables();
781 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "ACPI Tables freed\n"));
782
783 return_VOID;
784 }
785
786 /*******************************************************************************
787 *
788 * FUNCTION: acpi_ns_opens_scope
789 *
790 * PARAMETERS: Type - A valid namespace type
791 *
792 * RETURN: NEWSCOPE if the passed type "opens a name scope" according
793 * to the ACPI specification, else 0
794 *
795 ******************************************************************************/
796
797 u32 acpi_ns_opens_scope(acpi_object_type type)
798 {
799 ACPI_FUNCTION_TRACE_STR(ns_opens_scope, acpi_ut_get_type_name(type));
800
801 if (!acpi_ut_valid_object_type(type)) {
802
803 /* type code out of range */
804
805 ACPI_WARNING((AE_INFO, "Invalid Object Type %X", type));
806 return_UINT32(ACPI_NS_NORMAL);
807 }
808
809 return_UINT32(((u32) acpi_gbl_ns_properties[type]) & ACPI_NS_NEWSCOPE);
810 }
811
812 /*******************************************************************************
813 *
814 * FUNCTION: acpi_ns_get_node_by_path
815 *
816 * PARAMETERS: *Pathname - Name to be found, in external (ASL) format. The
817 * \ (backslash) and ^ (carat) prefixes, and the
818 * . (period) to separate segments are supported.
819 * start_node - Root of subtree to be searched, or NS_ALL for the
820 * root of the name space. If Name is fully
821 * qualified (first s8 is '\'), the passed value
822 * of Scope will not be accessed.
823 * Flags - Used to indicate whether to perform upsearch or
824 * not.
825 * return_node - Where the Node is returned
826 *
827 * DESCRIPTION: Look up a name relative to a given scope and return the
828 * corresponding Node. NOTE: Scope can be null.
829 *
830 * MUTEX: Locks namespace
831 *
832 ******************************************************************************/
833
834 acpi_status
835 acpi_ns_get_node_by_path(char *pathname,
836 struct acpi_namespace_node *start_node,
837 u32 flags, struct acpi_namespace_node **return_node)
838 {
839 union acpi_generic_state scope_info;
840 acpi_status status;
841 char *internal_path = NULL;
842
843 ACPI_FUNCTION_TRACE_PTR(ns_get_node_by_path, pathname);
844
845 if (pathname) {
846
847 /* Convert path to internal representation */
848
849 status = acpi_ns_internalize_name(pathname, &internal_path);
850 if (ACPI_FAILURE(status)) {
851 return_ACPI_STATUS(status);
852 }
853 }
854
855 /* Must lock namespace during lookup */
856
857 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
858 if (ACPI_FAILURE(status)) {
859 goto cleanup;
860 }
861
862 /* Setup lookup scope (search starting point) */
863
864 scope_info.scope.node = start_node;
865
866 /* Lookup the name in the namespace */
867
868 status = acpi_ns_lookup(&scope_info, internal_path,
869 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
870 (flags | ACPI_NS_DONT_OPEN_SCOPE),
871 NULL, return_node);
872 if (ACPI_FAILURE(status)) {
873 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s, %s\n",
874 internal_path,
875 acpi_format_exception(status)));
876 }
877
878 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
879
880 cleanup:
881 if (internal_path) {
882 ACPI_FREE(internal_path);
883 }
884 return_ACPI_STATUS(status);
885 }
886
887 /*******************************************************************************
888 *
889 * FUNCTION: acpi_ns_get_parent_node
890 *
891 * PARAMETERS: Node - Current table entry
892 *
893 * RETURN: Parent entry of the given entry
894 *
895 * DESCRIPTION: Obtain the parent entry for a given entry in the namespace.
896 *
897 ******************************************************************************/
898
899 struct acpi_namespace_node *acpi_ns_get_parent_node(struct acpi_namespace_node
900 *node)
901 {
902 ACPI_FUNCTION_ENTRY();
903
904 if (!node) {
905 return (NULL);
906 }
907
908 /*
909 * Walk to the end of this peer list. The last entry is marked with a flag
910 * and the peer pointer is really a pointer back to the parent. This saves
911 * putting a parent back pointer in each and every named object!
912 */
913 while (!(node->flags & ANOBJ_END_OF_PEER_LIST)) {
914 node = node->peer;
915 }
916
917 return (node->peer);
918 }
919
920 /*******************************************************************************
921 *
922 * FUNCTION: acpi_ns_get_next_valid_node
923 *
924 * PARAMETERS: Node - Current table entry
925 *
926 * RETURN: Next valid Node in the linked node list. NULL if no more valid
927 * nodes.
928 *
929 * DESCRIPTION: Find the next valid node within a name table.
930 * Useful for implementing NULL-end-of-list loops.
931 *
932 ******************************************************************************/
933
934 struct acpi_namespace_node *acpi_ns_get_next_valid_node(struct
935 acpi_namespace_node
936 *node)
937 {
938
939 /* If we are at the end of this peer list, return NULL */
940
941 if (node->flags & ANOBJ_END_OF_PEER_LIST) {
942 return NULL;
943 }
944
945 /* Otherwise just return the next peer */
946
947 return (node->peer);
948 }
949
950 #ifdef ACPI_OBSOLETE_FUNCTIONS
951 /*******************************************************************************
952 *
953 * FUNCTION: acpi_ns_find_parent_name
954 *
955 * PARAMETERS: *child_node - Named Obj whose name is to be found
956 *
957 * RETURN: The ACPI name
958 *
959 * DESCRIPTION: Search for the given obj in its parent scope and return the
960 * name segment, or "????" if the parent name can't be found
961 * (which "should not happen").
962 *
963 ******************************************************************************/
964
965 acpi_name acpi_ns_find_parent_name(struct acpi_namespace_node * child_node)
966 {
967 struct acpi_namespace_node *parent_node;
968
969 ACPI_FUNCTION_TRACE(ns_find_parent_name);
970
971 if (child_node) {
972
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)