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[PATCH] W1: w1_netlink: New init/fini netlink callbacks.
[linux-2.6/verdex.git] / drivers / acpi / namespace / nsaccess.c
blobedfbe34600f5178b66b9ec39f18c768eee2b1dfd
1 /*******************************************************************************
2 *
3 * Module Name: nsaccess - Top-level functions for accessing ACPI namespace
4 *
5 ******************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2005, R. Byron Moore
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44 #include <acpi/acpi.h>
45 #include <acpi/amlcode.h>
46 #include <acpi/acnamesp.h>
47 #include <acpi/acdispat.h>
48
49 #define _COMPONENT ACPI_NAMESPACE
50 ACPI_MODULE_NAME("nsaccess")
51
52 /*******************************************************************************
53 *
54 * FUNCTION: acpi_ns_root_initialize
55 *
56 * PARAMETERS: None
57 *
58 * RETURN: Status
59 *
60 * DESCRIPTION: Allocate and initialize the default root named objects
61 *
62 * MUTEX: Locks namespace for entire execution
63 *
64 ******************************************************************************/
65 acpi_status acpi_ns_root_initialize(void)
66 {
67 acpi_status status;
68 const struct acpi_predefined_names *init_val = NULL;
69 struct acpi_namespace_node *new_node;
70 union acpi_operand_object *obj_desc;
71 acpi_string val = NULL;
72
73 ACPI_FUNCTION_TRACE("ns_root_initialize");
74
75 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
76 if (ACPI_FAILURE(status)) {
77 return_ACPI_STATUS(status);
78 }
79
80 /*
81 * The global root ptr is initially NULL, so a non-NULL value indicates
82 * that acpi_ns_root_initialize() has already been called; just return.
83 */
84 if (acpi_gbl_root_node) {
85 status = AE_OK;
86 goto unlock_and_exit;
87 }
88
89 /*
90 * Tell the rest of the subsystem that the root is initialized
91 * (This is OK because the namespace is locked)
92 */
93 acpi_gbl_root_node = &acpi_gbl_root_node_struct;
94
95 /* Enter the pre-defined names in the name table */
96
97 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
98 "Entering predefined entries into namespace\n"));
99
100 for (init_val = acpi_gbl_pre_defined_names; init_val->name; init_val++) {
101 /* _OSI is optional for now, will be permanent later */
102
103 if (!ACPI_STRCMP(init_val->name, "_OSI")
104 && !acpi_gbl_create_osi_method) {
105 continue;
106 }
107
108 status = acpi_ns_lookup(NULL, init_val->name, init_val->type,
109 ACPI_IMODE_LOAD_PASS2,
110 ACPI_NS_NO_UPSEARCH, NULL, &new_node);
111
112 if (ACPI_FAILURE(status) || (!new_node)) { /* Must be on same line for code converter */
113 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
114 "Could not create predefined name %s, %s\n",
115 init_val->name,
116 acpi_format_exception(status)));
117 }
118
119 /*
120 * Name entered successfully.
121 * If entry in pre_defined_names[] specifies an
122 * initial value, create the initial value.
123 */
124 if (init_val->val) {
125 status = acpi_os_predefined_override(init_val, &val);
126 if (ACPI_FAILURE(status)) {
127 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
128 "Could not override predefined %s\n",
129 init_val->name));
130 }
131
132 if (!val) {
133 val = init_val->val;
134 }
135
136 /*
137 * Entry requests an initial value, allocate a
138 * descriptor for it.
139 */
140 obj_desc =
141 acpi_ut_create_internal_object(init_val->type);
142 if (!obj_desc) {
143 status = AE_NO_MEMORY;
144 goto unlock_and_exit;
145 }
146
147 /*
148 * Convert value string from table entry to
149 * internal representation. Only types actually
150 * used for initial values are implemented here.
151 */
152 switch (init_val->type) {
153 case ACPI_TYPE_METHOD:
154 obj_desc->method.param_count =
155 (u8) ACPI_TO_INTEGER(val);
156 obj_desc->common.flags |= AOPOBJ_DATA_VALID;
157
158 #if defined (ACPI_ASL_COMPILER)
159
160 /* save the parameter count for the i_aSL compiler */
161
162 new_node->value = obj_desc->method.param_count;
163 #else
164 /* Mark this as a very SPECIAL method */
165
166 obj_desc->method.method_flags =
167 AML_METHOD_INTERNAL_ONLY;
168
169 #ifndef ACPI_DUMP_APP
170 obj_desc->method.implementation =
171 acpi_ut_osi_implementation;
172 #endif
173 #endif
174 break;
175
176 case ACPI_TYPE_INTEGER:
177
178 obj_desc->integer.value = ACPI_TO_INTEGER(val);
179 break;
180
181 case ACPI_TYPE_STRING:
182
183 /*
184 * Build an object around the static string
185 */
186 obj_desc->string.length =
187 (u32) ACPI_STRLEN(val);
188 obj_desc->string.pointer = val;
189 obj_desc->common.flags |= AOPOBJ_STATIC_POINTER;
190 break;
191
192 case ACPI_TYPE_MUTEX:
193
194 obj_desc->mutex.node = new_node;
195 obj_desc->mutex.sync_level =
196 (u8) (ACPI_TO_INTEGER(val) - 1);
197
198 if (ACPI_STRCMP(init_val->name, "_GL_") == 0) {
199 /*
200 * Create a counting semaphore for the
201 * global lock
202 */
203 status =
204 acpi_os_create_semaphore
205 (ACPI_NO_UNIT_LIMIT, 1,
206 &obj_desc->mutex.semaphore);
207 if (ACPI_FAILURE(status)) {
208 acpi_ut_remove_reference
209 (obj_desc);
210 goto unlock_and_exit;
211 }
212
213 /*
214 * We just created the mutex for the
215 * global lock, save it
216 */
217 acpi_gbl_global_lock_semaphore =
218 obj_desc->mutex.semaphore;
219 } else {
220 /* Create a mutex */
221
222 status = acpi_os_create_semaphore(1, 1,
223 &obj_desc->
224 mutex.
225 semaphore);
226 if (ACPI_FAILURE(status)) {
227 acpi_ut_remove_reference
228 (obj_desc);
229 goto unlock_and_exit;
230 }
231 }
232 break;
233
234 default:
235
236 ACPI_REPORT_ERROR(("Unsupported initial type value %X\n", init_val->type));
237 acpi_ut_remove_reference(obj_desc);
238 obj_desc = NULL;
239 continue;
240 }
241
242 /* Store pointer to value descriptor in the Node */
243
244 status = acpi_ns_attach_object(new_node, obj_desc,
245 ACPI_GET_OBJECT_TYPE
246 (obj_desc));
247
248 /* Remove local reference to the object */
249
250 acpi_ut_remove_reference(obj_desc);
251 }
252 }
253
254 unlock_and_exit:
255 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
256
257 /* Save a handle to "_GPE", it is always present */
258
259 if (ACPI_SUCCESS(status)) {
260 status =
261 acpi_ns_get_node_by_path("\\_GPE", NULL,
262 ACPI_NS_NO_UPSEARCH,
263 &acpi_gbl_fadt_gpe_device);
264 }
265
266 return_ACPI_STATUS(status);
267 }
268
269 /*******************************************************************************
270 *
271 * FUNCTION: acpi_ns_lookup
272 *
273 * PARAMETERS: scope_info - Current scope info block
274 * Pathname - Search pathname, in internal format
275 * (as represented in the AML stream)
276 * Type - Type associated with name
277 * interpreter_mode - IMODE_LOAD_PASS2 => add name if not found
278 * Flags - Flags describing the search restrictions
279 * walk_state - Current state of the walk
280 * return_node - Where the Node is placed (if found
281 * or created successfully)
282 *
283 * RETURN: Status
284 *
285 * DESCRIPTION: Find or enter the passed name in the name space.
286 * Log an error if name not found in Exec mode.
287 *
288 * MUTEX: Assumes namespace is locked.
289 *
290 ******************************************************************************/
291
292 acpi_status
293 acpi_ns_lookup(union acpi_generic_state *scope_info,
294 char *pathname,
295 acpi_object_type type,
296 acpi_interpreter_mode interpreter_mode,
297 u32 flags,
298 struct acpi_walk_state *walk_state,
299 struct acpi_namespace_node **return_node)
300 {
301 acpi_status status;
302 char *path = pathname;
303 struct acpi_namespace_node *prefix_node;
304 struct acpi_namespace_node *current_node = NULL;
305 struct acpi_namespace_node *this_node = NULL;
306 u32 num_segments;
307 u32 num_carats;
308 acpi_name simple_name;
309 acpi_object_type type_to_check_for;
310 acpi_object_type this_search_type;
311 u32 search_parent_flag = ACPI_NS_SEARCH_PARENT;
312 u32 local_flags = flags & ~(ACPI_NS_ERROR_IF_FOUND |
313 ACPI_NS_SEARCH_PARENT);
314
315 ACPI_FUNCTION_TRACE("ns_lookup");
316
317 if (!return_node) {
318 return_ACPI_STATUS(AE_BAD_PARAMETER);
319 }
320
321 acpi_gbl_ns_lookup_count++;
322 *return_node = ACPI_ENTRY_NOT_FOUND;
323
324 if (!acpi_gbl_root_node) {
325 return_ACPI_STATUS(AE_NO_NAMESPACE);
326 }
327
328 /*
329 * Get the prefix scope.
330 * A null scope means use the root scope
331 */
332 if ((!scope_info) || (!scope_info->scope.node)) {
333 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
334 "Null scope prefix, using root node (%p)\n",
335 acpi_gbl_root_node));
336
337 prefix_node = acpi_gbl_root_node;
338 } else {
339 prefix_node = scope_info->scope.node;
340 if (ACPI_GET_DESCRIPTOR_TYPE(prefix_node) !=
341 ACPI_DESC_TYPE_NAMED) {
342 ACPI_REPORT_ERROR(("ns_lookup: %p is not a namespace node [%s]\n", prefix_node, acpi_ut_get_descriptor_name(prefix_node)));
343 return_ACPI_STATUS(AE_AML_INTERNAL);
344 }
345
346 /*
347 * This node might not be a actual "scope" node (such as a
348 * Device/Method, etc.) It could be a Package or other object node.
349 * Backup up the tree to find the containing scope node.
350 */
351 while (!acpi_ns_opens_scope(prefix_node->type) &&
352 prefix_node->type != ACPI_TYPE_ANY) {
353 prefix_node = acpi_ns_get_parent_node(prefix_node);
354 }
355 }
356
357 /* Save type TBD: may be no longer necessary */
358
359 type_to_check_for = type;
360
361 /*
362 * Begin examination of the actual pathname
363 */
364 if (!pathname) {
365 /* A Null name_path is allowed and refers to the root */
366
367 num_segments = 0;
368 this_node = acpi_gbl_root_node;
369 path = "";
370
371 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
372 "Null Pathname (Zero segments), Flags=%X\n",
373 flags));
374 } else {
375 /*
376 * Name pointer is valid (and must be in internal name format)
377 *
378 * Check for scope prefixes:
379 *
380 * As represented in the AML stream, a namepath consists of an
381 * optional scope prefix followed by a name segment part.
382 *
383 * If present, the scope prefix is either a Root Prefix (in
384 * which case the name is fully qualified), or one or more
385 * Parent Prefixes (in which case the name's scope is relative
386 * to the current scope).
387 */
388 if (*path == (u8) AML_ROOT_PREFIX) {
389 /* Pathname is fully qualified, start from the root */
390
391 this_node = acpi_gbl_root_node;
392 search_parent_flag = ACPI_NS_NO_UPSEARCH;
393
394 /* Point to name segment part */
395
396 path++;
397
398 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
399 "Path is absolute from root [%p]\n",
400 this_node));
401 } else {
402 /* Pathname is relative to current scope, start there */
403
404 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
405 "Searching relative to prefix scope [%4.4s] (%p)\n",
406 acpi_ut_get_node_name(prefix_node),
407 prefix_node));
408
409 /*
410 * Handle multiple Parent Prefixes (carat) by just getting
411 * the parent node for each prefix instance.
412 */
413 this_node = prefix_node;
414 num_carats = 0;
415 while (*path == (u8) AML_PARENT_PREFIX) {
416 /* Name is fully qualified, no search rules apply */
417
418 search_parent_flag = ACPI_NS_NO_UPSEARCH;
419 /*
420 * Point past this prefix to the name segment
421 * part or the next Parent Prefix
422 */
423 path++;
424
425 /* Backup to the parent node */
426
427 num_carats++;
428 this_node = acpi_ns_get_parent_node(this_node);
429 if (!this_node) {
430 /* Current scope has no parent scope */
431
432 ACPI_REPORT_ERROR(("ACPI path has too many parent prefixes (^) - reached beyond root node\n"));
433 return_ACPI_STATUS(AE_NOT_FOUND);
434 }
435 }
436
437 if (search_parent_flag == ACPI_NS_NO_UPSEARCH) {
438 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
439 "Search scope is [%4.4s], path has %d carat(s)\n",
440 acpi_ut_get_node_name
441 (this_node), num_carats));
442 }
443 }
444
445 /*
446 * Determine the number of ACPI name segments in this pathname.
447 *
448 * The segment part consists of either:
449 * - A Null name segment (0)
450 * - A dual_name_prefix followed by two 4-byte name segments
451 * - A multi_name_prefix followed by a byte indicating the
452 * number of segments and the segments themselves.
453 * - A single 4-byte name segment
454 *
455 * Examine the name prefix opcode, if any, to determine the number of
456 * segments.
457 */
458 switch (*path) {
459 case 0:
460 /*
461 * Null name after a root or parent prefixes. We already
462 * have the correct target node and there are no name segments.
463 */
464 num_segments = 0;
465 type = this_node->type;
466
467 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
468 "Prefix-only Pathname (Zero name segments), Flags=%X\n",
469 flags));
470 break;
471
472 case AML_DUAL_NAME_PREFIX:
473
474 /* More than one name_seg, search rules do not apply */
475
476 search_parent_flag = ACPI_NS_NO_UPSEARCH;
477
478 /* Two segments, point to first name segment */
479
480 num_segments = 2;
481 path++;
482
483 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
484 "Dual Pathname (2 segments, Flags=%X)\n",
485 flags));
486 break;
487
488 case AML_MULTI_NAME_PREFIX_OP:
489
490 /* More than one name_seg, search rules do not apply */
491
492 search_parent_flag = ACPI_NS_NO_UPSEARCH;
493
494 /* Extract segment count, point to first name segment */
495
496 path++;
497 num_segments = (u32) (u8) * path;
498 path++;
499
500 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
501 "Multi Pathname (%d Segments, Flags=%X) \n",
502 num_segments, flags));
503 break;
504
505 default:
506 /*
507 * Not a Null name, no Dual or Multi prefix, hence there is
508 * only one name segment and Pathname is already pointing to it.
509 */
510 num_segments = 1;
511
512 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
513 "Simple Pathname (1 segment, Flags=%X)\n",
514 flags));
515 break;
516 }
517
518 ACPI_DEBUG_EXEC(acpi_ns_print_pathname(num_segments, path));
519 }
520
521 /*
522 * Search namespace for each segment of the name. Loop through and
523 * verify (or add to the namespace) each name segment.
524 *
525 * The object type is significant only at the last name
526 * segment. (We don't care about the types along the path, only
527 * the type of the final target object.)
528 */
529 this_search_type = ACPI_TYPE_ANY;
530 current_node = this_node;
531 while (num_segments && current_node) {
532 num_segments--;
533 if (!num_segments) {
534 /*
535 * This is the last segment, enable typechecking
536 */
537 this_search_type = type;
538
539 /*
540 * Only allow automatic parent search (search rules) if the caller
541 * requested it AND we have a single, non-fully-qualified name_seg
542 */
543 if ((search_parent_flag != ACPI_NS_NO_UPSEARCH) &&
544 (flags & ACPI_NS_SEARCH_PARENT)) {
545 local_flags |= ACPI_NS_SEARCH_PARENT;
546 }
547
548 /* Set error flag according to caller */
549
550 if (flags & ACPI_NS_ERROR_IF_FOUND) {
551 local_flags |= ACPI_NS_ERROR_IF_FOUND;
552 }
553 }
554
555 /* Extract one ACPI name from the front of the pathname */
556
557 ACPI_MOVE_32_TO_32(&simple_name, path);
558
559 /* Try to find the single (4 character) ACPI name */
560
561 status =
562 acpi_ns_search_and_enter(simple_name, walk_state,
563 current_node, interpreter_mode,
564 this_search_type, local_flags,
565 &this_node);
566 if (ACPI_FAILURE(status)) {
567 if (status == AE_NOT_FOUND) {
568 /* Name not found in ACPI namespace */
569
570 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
571 "Name [%4.4s] not found in scope [%4.4s] %p\n",
572 (char *)&simple_name,
573 (char *)&current_node->name,
574 current_node));
575 }
576
577 *return_node = this_node;
578 return_ACPI_STATUS(status);
579 }
580
581 /*
582 * Sanity typecheck of the target object:
583 *
584 * If 1) This is the last segment (num_segments == 0)
585 * 2) And we are looking for a specific type
586 * (Not checking for TYPE_ANY)
587 * 3) Which is not an alias
588 * 4) Which is not a local type (TYPE_SCOPE)
589 * 5) And the type of target object is known (not TYPE_ANY)
590 * 6) And target object does not match what we are looking for
591 *
592 * Then we have a type mismatch. Just warn and ignore it.
593 */
594 if ((num_segments == 0) &&
595 (type_to_check_for != ACPI_TYPE_ANY) &&
596 (type_to_check_for != ACPI_TYPE_LOCAL_ALIAS) &&
597 (type_to_check_for != ACPI_TYPE_LOCAL_METHOD_ALIAS) &&
598 (type_to_check_for != ACPI_TYPE_LOCAL_SCOPE) &&
599 (this_node->type != ACPI_TYPE_ANY) &&
600 (this_node->type != type_to_check_for)) {
601 /* Complain about a type mismatch */
602
603 ACPI_REPORT_WARNING(("ns_lookup: Type mismatch on %4.4s (%s), searching for (%s)\n", (char *)&simple_name, acpi_ut_get_type_name(this_node->type), acpi_ut_get_type_name(type_to_check_for)));
604 }
605
606 /*
607 * If this is the last name segment and we are not looking for a
608 * specific type, but the type of found object is known, use that type
609 * to see if it opens a scope.
610 */
611 if ((num_segments == 0) && (type == ACPI_TYPE_ANY)) {
612 type = this_node->type;
613 }
614
615 /* Point to next name segment and make this node current */
616
617 path += ACPI_NAME_SIZE;
618 current_node = this_node;
619 }
620
621 /*
622 * Always check if we need to open a new scope
623 */
624 if (!(flags & ACPI_NS_DONT_OPEN_SCOPE) && (walk_state)) {
625 /*
626 * If entry is a type which opens a scope, push the new scope on the
627 * scope stack.
628 */
629 if (acpi_ns_opens_scope(type)) {
630 status =
631 acpi_ds_scope_stack_push(this_node, type,
632 walk_state);
633 if (ACPI_FAILURE(status)) {
634 return_ACPI_STATUS(status);
635 }
636 }
637 }
638
639 *return_node = this_node;
640 return_ACPI_STATUS(AE_OK);
641 }
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