1 /*******************************************************************************
2 *
3 * Module Name: nsxfeval - Public interfaces to the ACPI subsystem
4 * ACPI Object evaluation interfaces
5 *
6 ******************************************************************************/
7
8 /*
9 * Copyright (C) 2000 - 2016, Intel Corp.
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 #define EXPORT_ACPI_INTERFACES
46
47 #include <acpi/acpi.h>
48 #include "accommon.h"
49 #include "acnamesp.h"
50 #include "acinterp.h"
51
52 #define _COMPONENT ACPI_NAMESPACE
53 ACPI_MODULE_NAME("nsxfeval")
54
55 /* Local prototypes */
56 static void acpi_ns_resolve_references(struct acpi_evaluate_info *info);
57
58 /*******************************************************************************
59 *
60 * FUNCTION: acpi_evaluate_object_typed
61 *
62 * PARAMETERS: handle - Object handle (optional)
63 * pathname - Object pathname (optional)
64 * external_params - List of parameters to pass to method,
65 * terminated by NULL. May be NULL
66 * if no parameters are being passed.
67 * return_buffer - Where to put method's return value (if
68 * any). If NULL, no value is returned.
69 * return_type - Expected type of return object
70 *
71 * RETURN: Status
72 *
73 * DESCRIPTION: Find and evaluate the given object, passing the given
74 * parameters if necessary. One of "Handle" or "Pathname" must
75 * be valid (non-null)
76 *
77 ******************************************************************************/
78
79 acpi_status
acpi_evaluate_object_typed(acpi_handle handle,acpi_string pathname,struct acpi_object_list * external_params,struct acpi_buffer * return_buffer,acpi_object_type return_type)80 acpi_evaluate_object_typed(acpi_handle handle,
81 acpi_string pathname,
82 struct acpi_object_list *external_params,
83 struct acpi_buffer *return_buffer,
84 acpi_object_type return_type)
85 {
86 acpi_status status;
87 u8 free_buffer_on_error = FALSE;
88
89 ACPI_FUNCTION_TRACE(acpi_evaluate_object_typed);
90
91 /* Return buffer must be valid */
92
93 if (!return_buffer) {
94 return_ACPI_STATUS(AE_BAD_PARAMETER);
95 }
96
97 if (return_buffer->length == ACPI_ALLOCATE_BUFFER) {
98 free_buffer_on_error = TRUE;
99 }
100
101 /* Evaluate the object */
102
103 status = acpi_evaluate_object(handle, pathname,
104 external_params, return_buffer);
105 if (ACPI_FAILURE(status)) {
106 return_ACPI_STATUS(status);
107 }
108
109 /* Type ANY means "don't care" */
110
111 if (return_type == ACPI_TYPE_ANY) {
112 return_ACPI_STATUS(AE_OK);
113 }
114
115 if (return_buffer->length == 0) {
116
117 /* Error because caller specifically asked for a return value */
118
119 ACPI_ERROR((AE_INFO, "No return value"));
120 return_ACPI_STATUS(AE_NULL_OBJECT);
121 }
122
123 /* Examine the object type returned from evaluate_object */
124
125 if (((union acpi_object *)return_buffer->pointer)->type == return_type) {
126 return_ACPI_STATUS(AE_OK);
127 }
128
129 /* Return object type does not match requested type */
130
131 ACPI_ERROR((AE_INFO,
132 "Incorrect return type [%s] requested [%s]",
133 acpi_ut_get_type_name(((union acpi_object *)return_buffer->
134 pointer)->type),
135 acpi_ut_get_type_name(return_type)));
136
137 if (free_buffer_on_error) {
138 /*
139 * Free a buffer created via ACPI_ALLOCATE_BUFFER.
140 * Note: We use acpi_os_free here because acpi_os_allocate was used
141 * to allocate the buffer. This purposefully bypasses the
142 * (optionally enabled) allocation tracking mechanism since we
143 * only want to track internal allocations.
144 */
145 acpi_os_free(return_buffer->pointer);
146 return_buffer->pointer = NULL;
147 }
148
149 return_buffer->length = 0;
150 return_ACPI_STATUS(AE_TYPE);
151 }
152
ACPI_EXPORT_SYMBOL(acpi_evaluate_object_typed)153 ACPI_EXPORT_SYMBOL(acpi_evaluate_object_typed)
154
155 /*******************************************************************************
156 *
157 * FUNCTION: acpi_evaluate_object
158 *
159 * PARAMETERS: handle - Object handle (optional)
160 * pathname - Object pathname (optional)
161 * external_params - List of parameters to pass to method,
162 * terminated by NULL. May be NULL
163 * if no parameters are being passed.
164 * return_buffer - Where to put method's return value (if
165 * any). If NULL, no value is returned.
166 *
167 * RETURN: Status
168 *
169 * DESCRIPTION: Find and evaluate the given object, passing the given
170 * parameters if necessary. One of "Handle" or "Pathname" must
171 * be valid (non-null)
172 *
173 ******************************************************************************/
174 acpi_status
175 acpi_evaluate_object(acpi_handle handle,
176 acpi_string pathname,
177 struct acpi_object_list *external_params,
178 struct acpi_buffer *return_buffer)
179 {
180 acpi_status status;
181 struct acpi_evaluate_info *info;
182 acpi_size buffer_space_needed;
183 u32 i;
184
185 ACPI_FUNCTION_TRACE(acpi_evaluate_object);
186
187 /* Allocate and initialize the evaluation information block */
188
189 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
190 if (!info) {
191 return_ACPI_STATUS(AE_NO_MEMORY);
192 }
193
194 /* Convert and validate the device handle */
195
196 info->prefix_node = acpi_ns_validate_handle(handle);
197 if (!info->prefix_node) {
198 status = AE_BAD_PARAMETER;
199 goto cleanup;
200 }
201
202 /*
203 * Get the actual namespace node for the target object.
204 * Handles these cases:
205 *
206 * 1) Null node, valid pathname from root (absolute path)
207 * 2) Node and valid pathname (path relative to Node)
208 * 3) Node, Null pathname
209 */
210 if ((pathname) && (ACPI_IS_ROOT_PREFIX(pathname[0]))) {
211
212 /* The path is fully qualified, just evaluate by name */
213
214 info->prefix_node = NULL;
215 } else if (!handle) {
216 /*
217 * A handle is optional iff a fully qualified pathname is specified.
218 * Since we've already handled fully qualified names above, this is
219 * an error.
220 */
221 if (!pathname) {
222 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
223 "Both Handle and Pathname are NULL"));
224 } else {
225 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
226 "Null Handle with relative pathname [%s]",
227 pathname));
228 }
229
230 status = AE_BAD_PARAMETER;
231 goto cleanup;
232 }
233
234 info->relative_pathname = pathname;
235
236 /*
237 * Convert all external objects passed as arguments to the
238 * internal version(s).
239 */
240 if (external_params && external_params->count) {
241 info->param_count = (u16)external_params->count;
242
243 /* Warn on impossible argument count */
244
245 if (info->param_count > ACPI_METHOD_NUM_ARGS) {
246 ACPI_WARN_PREDEFINED((AE_INFO, pathname,
247 ACPI_WARN_ALWAYS,
248 "Excess arguments (%u) - using only %u",
249 info->param_count,
250 ACPI_METHOD_NUM_ARGS));
251
252 info->param_count = ACPI_METHOD_NUM_ARGS;
253 }
254
255 /*
256 * Allocate a new parameter block for the internal objects
257 * Add 1 to count to allow for null terminated internal list
258 */
259 info->parameters = ACPI_ALLOCATE_ZEROED(((acpi_size)info->
260 param_count +
261 1) * sizeof(void *));
262 if (!info->parameters) {
263 status = AE_NO_MEMORY;
264 goto cleanup;
265 }
266
267 /* Convert each external object in the list to an internal object */
268
269 for (i = 0; i < info->param_count; i++) {
270 status =
271 acpi_ut_copy_eobject_to_iobject(&external_params->
272 pointer[i],
273 &info->
274 parameters[i]);
275 if (ACPI_FAILURE(status)) {
276 goto cleanup;
277 }
278 }
279
280 info->parameters[info->param_count] = NULL;
281 }
282
283 #ifdef _FUTURE_FEATURE
284
285 /*
286 * Begin incoming argument count analysis. Check for too few args
287 * and too many args.
288 */
289 switch (acpi_ns_get_type(info->node)) {
290 case ACPI_TYPE_METHOD:
291
292 /* Check incoming argument count against the method definition */
293
294 if (info->obj_desc->method.param_count > info->param_count) {
295 ACPI_ERROR((AE_INFO,
296 "Insufficient arguments (%u) - %u are required",
297 info->param_count,
298 info->obj_desc->method.param_count));
299
300 status = AE_MISSING_ARGUMENTS;
301 goto cleanup;
302 }
303
304 else if (info->obj_desc->method.param_count < info->param_count) {
305 ACPI_WARNING((AE_INFO,
306 "Excess arguments (%u) - only %u are required",
307 info->param_count,
308 info->obj_desc->method.param_count));
309
310 /* Just pass the required number of arguments */
311
312 info->param_count = info->obj_desc->method.param_count;
313 }
314
315 /*
316 * Any incoming external objects to be passed as arguments to the
317 * method must be converted to internal objects
318 */
319 if (info->param_count) {
320 /*
321 * Allocate a new parameter block for the internal objects
322 * Add 1 to count to allow for null terminated internal list
323 */
324 info->parameters = ACPI_ALLOCATE_ZEROED(((acpi_size)
325 info->
326 param_count +
327 1) *
328 sizeof(void *));
329 if (!info->parameters) {
330 status = AE_NO_MEMORY;
331 goto cleanup;
332 }
333
334 /* Convert each external object in the list to an internal object */
335
336 for (i = 0; i < info->param_count; i++) {
337 status =
338 acpi_ut_copy_eobject_to_iobject
339 (&external_params->pointer[i],
340 &info->parameters[i]);
341 if (ACPI_FAILURE(status)) {
342 goto cleanup;
343 }
344 }
345
346 info->parameters[info->param_count] = NULL;
347 }
348 break;
349
350 default:
351
352 /* Warn if arguments passed to an object that is not a method */
353
354 if (info->param_count) {
355 ACPI_WARNING((AE_INFO,
356 "%u arguments were passed to a non-method ACPI object",
357 info->param_count));
358 }
359 break;
360 }
361
362 #endif
363
364 /* Now we can evaluate the object */
365
366 status = acpi_ns_evaluate(info);
367
368 /*
369 * If we are expecting a return value, and all went well above,
370 * copy the return value to an external object.
371 */
372 if (!return_buffer) {
373 goto cleanup_return_object;
374 }
375
376 if (!info->return_object) {
377 return_buffer->length = 0;
378 goto cleanup;
379 }
380
381 if (ACPI_GET_DESCRIPTOR_TYPE(info->return_object) ==
382 ACPI_DESC_TYPE_NAMED) {
383 /*
384 * If we received a NS Node as a return object, this means that
385 * the object we are evaluating has nothing interesting to
386 * return (such as a mutex, etc.) We return an error because
387 * these types are essentially unsupported by this interface.
388 * We don't check up front because this makes it easier to add
389 * support for various types at a later date if necessary.
390 */
391 status = AE_TYPE;
392 info->return_object = NULL; /* No need to delete a NS Node */
393 return_buffer->length = 0;
394 }
395
396 if (ACPI_FAILURE(status)) {
397 goto cleanup_return_object;
398 }
399
400 /* Dereference Index and ref_of references */
401
402 acpi_ns_resolve_references(info);
403
404 /* Get the size of the returned object */
405
406 status = acpi_ut_get_object_size(info->return_object,
407 &buffer_space_needed);
408 if (ACPI_SUCCESS(status)) {
409
410 /* Validate/Allocate/Clear caller buffer */
411
412 status = acpi_ut_initialize_buffer(return_buffer,
413 buffer_space_needed);
414 if (ACPI_FAILURE(status)) {
415 /*
416 * Caller's buffer is too small or a new one can't
417 * be allocated
418 */
419 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
420 "Needed buffer size %X, %s\n",
421 (u32)buffer_space_needed,
422 acpi_format_exception(status)));
423 } else {
424 /* We have enough space for the object, build it */
425
426 status =
427 acpi_ut_copy_iobject_to_eobject(info->return_object,
428 return_buffer);
429 }
430 }
431
432 cleanup_return_object:
433
434 if (info->return_object) {
435 /*
436 * Delete the internal return object. NOTE: Interpreter must be
437 * locked to avoid race condition.
438 */
439 acpi_ex_enter_interpreter();
440
441 /* Remove one reference on the return object (should delete it) */
442
443 acpi_ut_remove_reference(info->return_object);
444 acpi_ex_exit_interpreter();
445 }
446
447 cleanup:
448
449 /* Free the input parameter list (if we created one) */
450
451 if (info->parameters) {
452
453 /* Free the allocated parameter block */
454
455 acpi_ut_delete_internal_object_list(info->parameters);
456 }
457
458 ACPI_FREE(info);
459 return_ACPI_STATUS(status);
460 }
461
ACPI_EXPORT_SYMBOL(acpi_evaluate_object)462 ACPI_EXPORT_SYMBOL(acpi_evaluate_object)
463
464 /*******************************************************************************
465 *
466 * FUNCTION: acpi_ns_resolve_references
467 *
468 * PARAMETERS: info - Evaluation info block
469 *
470 * RETURN: Info->return_object is replaced with the dereferenced object
471 *
472 * DESCRIPTION: Dereference certain reference objects. Called before an
473 * internal return object is converted to an external union acpi_object.
474 *
475 * Performs an automatic dereference of Index and ref_of reference objects.
476 * These reference objects are not supported by the union acpi_object, so this is a
477 * last resort effort to return something useful. Also, provides compatibility
478 * with other ACPI implementations.
479 *
480 * NOTE: does not handle references within returned package objects or nested
481 * references, but this support could be added later if found to be necessary.
482 *
483 ******************************************************************************/
484 static void acpi_ns_resolve_references(struct acpi_evaluate_info *info)
485 {
486 union acpi_operand_object *obj_desc = NULL;
487 struct acpi_namespace_node *node;
488
489 /* We are interested in reference objects only */
490
491 if ((info->return_object)->common.type != ACPI_TYPE_LOCAL_REFERENCE) {
492 return;
493 }
494
495 /*
496 * Two types of references are supported - those created by Index and
497 * ref_of operators. A name reference (AML_NAMEPATH_OP) can be converted
498 * to an union acpi_object, so it is not dereferenced here. A ddb_handle
499 * (AML_LOAD_OP) cannot be dereferenced, nor can it be converted to
500 * an union acpi_object.
501 */
502 switch (info->return_object->reference.class) {
503 case ACPI_REFCLASS_INDEX:
504
505 obj_desc = *(info->return_object->reference.where);
506 break;
507
508 case ACPI_REFCLASS_REFOF:
509
510 node = info->return_object->reference.object;
511 if (node) {
512 obj_desc = node->object;
513 }
514 break;
515
516 default:
517
518 return;
519 }
520
521 /* Replace the existing reference object */
522
523 if (obj_desc) {
524 acpi_ut_add_reference(obj_desc);
525 acpi_ut_remove_reference(info->return_object);
526 info->return_object = obj_desc;
527 }
528
529 return;
530 }
531
532 /*******************************************************************************
533 *
534 * FUNCTION: acpi_walk_namespace
535 *
536 * PARAMETERS: type - acpi_object_type to search for
537 * start_object - Handle in namespace where search begins
538 * max_depth - Depth to which search is to reach
539 * descending_callback - Called during tree descent
540 * when an object of "Type" is found
541 * ascending_callback - Called during tree ascent
542 * when an object of "Type" is found
543 * context - Passed to user function(s) above
544 * return_value - Location where return value of
545 * user_function is put if terminated early
546 *
547 * RETURNS Return value from the user_function if terminated early.
548 * Otherwise, returns NULL.
549 *
550 * DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
551 * starting (and ending) at the object specified by start_handle.
552 * The callback function is called whenever an object that matches
553 * the type parameter is found. If the callback function returns
554 * a non-zero value, the search is terminated immediately and this
555 * value is returned to the caller.
556 *
557 * The point of this procedure is to provide a generic namespace
558 * walk routine that can be called from multiple places to
559 * provide multiple services; the callback function(s) can be
560 * tailored to each task, whether it is a print function,
561 * a compare function, etc.
562 *
563 ******************************************************************************/
564
565 acpi_status
acpi_walk_namespace(acpi_object_type type,acpi_handle start_object,u32 max_depth,acpi_walk_callback descending_callback,acpi_walk_callback ascending_callback,void * context,void ** return_value)566 acpi_walk_namespace(acpi_object_type type,
567 acpi_handle start_object,
568 u32 max_depth,
569 acpi_walk_callback descending_callback,
570 acpi_walk_callback ascending_callback,
571 void *context, void **return_value)
572 {
573 acpi_status status;
574
575 ACPI_FUNCTION_TRACE(acpi_walk_namespace);
576
577 /* Parameter validation */
578
579 if ((type > ACPI_TYPE_LOCAL_MAX) ||
580 (!max_depth) || (!descending_callback && !ascending_callback)) {
581 return_ACPI_STATUS(AE_BAD_PARAMETER);
582 }
583
584 /*
585 * Need to acquire the namespace reader lock to prevent interference
586 * with any concurrent table unloads (which causes the deletion of
587 * namespace objects). We cannot allow the deletion of a namespace node
588 * while the user function is using it. The exception to this are the
589 * nodes created and deleted during control method execution -- these
590 * nodes are marked as temporary nodes and are ignored by the namespace
591 * walk. Thus, control methods can be executed while holding the
592 * namespace deletion lock (and the user function can execute control
593 * methods.)
594 */
595 status = acpi_ut_acquire_read_lock(&acpi_gbl_namespace_rw_lock);
596 if (ACPI_FAILURE(status)) {
597 return_ACPI_STATUS(status);
598 }
599
600 /*
601 * Lock the namespace around the walk. The namespace will be
602 * unlocked/locked around each call to the user function - since the user
603 * function must be allowed to make ACPICA calls itself (for example, it
604 * will typically execute control methods during device enumeration.)
605 */
606 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
607 if (ACPI_FAILURE(status)) {
608 goto unlock_and_exit;
609 }
610
611 /* Now we can validate the starting node */
612
613 if (!acpi_ns_validate_handle(start_object)) {
614 status = AE_BAD_PARAMETER;
615 goto unlock_and_exit2;
616 }
617
618 status = acpi_ns_walk_namespace(type, start_object, max_depth,
619 ACPI_NS_WALK_UNLOCK,
620 descending_callback, ascending_callback,
621 context, return_value);
622
623 unlock_and_exit2:
624 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
625
626 unlock_and_exit:
627 (void)acpi_ut_release_read_lock(&acpi_gbl_namespace_rw_lock);
628 return_ACPI_STATUS(status);
629 }
630
ACPI_EXPORT_SYMBOL(acpi_walk_namespace)631 ACPI_EXPORT_SYMBOL(acpi_walk_namespace)
632
633 /*******************************************************************************
634 *
635 * FUNCTION: acpi_ns_get_device_callback
636 *
637 * PARAMETERS: Callback from acpi_get_device
638 *
639 * RETURN: Status
640 *
641 * DESCRIPTION: Takes callbacks from walk_namespace and filters out all non-
642 * present devices, or if they specified a HID, it filters based
643 * on that.
644 *
645 ******************************************************************************/
646 static acpi_status
647 acpi_ns_get_device_callback(acpi_handle obj_handle,
648 u32 nesting_level,
649 void *context, void **return_value)
650 {
651 struct acpi_get_devices_info *info = context;
652 acpi_status status;
653 struct acpi_namespace_node *node;
654 u32 flags;
655 struct acpi_pnp_device_id *hid;
656 struct acpi_pnp_device_id_list *cid;
657 u32 i;
658 u8 found;
659 int no_match;
660
661 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
662 if (ACPI_FAILURE(status)) {
663 return (status);
664 }
665
666 node = acpi_ns_validate_handle(obj_handle);
667 status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
668 if (ACPI_FAILURE(status)) {
669 return (status);
670 }
671
672 if (!node) {
673 return (AE_BAD_PARAMETER);
674 }
675
676 /*
677 * First, filter based on the device HID and CID.
678 *
679 * 01/2010: For this case where a specific HID is requested, we don't
680 * want to run _STA until we have an actual HID match. Thus, we will
681 * not unnecessarily execute _STA on devices for which the caller
682 * doesn't care about. Previously, _STA was executed unconditionally
683 * on all devices found here.
684 *
685 * A side-effect of this change is that now we will continue to search
686 * for a matching HID even under device trees where the parent device
687 * would have returned a _STA that indicates it is not present or
688 * not functioning (thus aborting the search on that branch).
689 */
690 if (info->hid != NULL) {
691 status = acpi_ut_execute_HID(node, &hid);
692 if (status == AE_NOT_FOUND) {
693 return (AE_OK);
694 } else if (ACPI_FAILURE(status)) {
695 return (AE_CTRL_DEPTH);
696 }
697
698 no_match = strcmp(hid->string, info->hid);
699 ACPI_FREE(hid);
700
701 if (no_match) {
702 /*
703 * HID does not match, attempt match within the
704 * list of Compatible IDs (CIDs)
705 */
706 status = acpi_ut_execute_CID(node, &cid);
707 if (status == AE_NOT_FOUND) {
708 return (AE_OK);
709 } else if (ACPI_FAILURE(status)) {
710 return (AE_CTRL_DEPTH);
711 }
712
713 /* Walk the CID list */
714
715 found = FALSE;
716 for (i = 0; i < cid->count; i++) {
717 if (strcmp(cid->ids[i].string, info->hid) == 0) {
718
719 /* Found a matching CID */
720
721 found = TRUE;
722 break;
723 }
724 }
725
726 ACPI_FREE(cid);
727 if (!found) {
728 return (AE_OK);
729 }
730 }
731 }
732
733 /* Run _STA to determine if device is present */
734
735 status = acpi_ut_execute_STA(node, &flags);
736 if (ACPI_FAILURE(status)) {
737 return (AE_CTRL_DEPTH);
738 }
739
740 if (!(flags & ACPI_STA_DEVICE_PRESENT) &&
741 !(flags & ACPI_STA_DEVICE_FUNCTIONING)) {
742 /*
743 * Don't examine the children of the device only when the
744 * device is neither present nor functional. See ACPI spec,
745 * description of _STA for more information.
746 */
747 return (AE_CTRL_DEPTH);
748 }
749
750 /* We have a valid device, invoke the user function */
751
752 status = info->user_function(obj_handle, nesting_level,
753 info->context, return_value);
754 return (status);
755 }
756
757 /*******************************************************************************
758 *
759 * FUNCTION: acpi_get_devices
760 *
761 * PARAMETERS: HID - HID to search for. Can be NULL.
762 * user_function - Called when a matching object is found
763 * context - Passed to user function
764 * return_value - Location where return value of
765 * user_function is put if terminated early
766 *
767 * RETURNS Return value from the user_function if terminated early.
768 * Otherwise, returns NULL.
769 *
770 * DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
771 * starting (and ending) at the object specified by start_handle.
772 * The user_function is called whenever an object of type
773 * Device is found. If the user function returns
774 * a non-zero value, the search is terminated immediately and this
775 * value is returned to the caller.
776 *
777 * This is a wrapper for walk_namespace, but the callback performs
778 * additional filtering. Please see acpi_ns_get_device_callback.
779 *
780 ******************************************************************************/
781
782 acpi_status
acpi_get_devices(const char * HID,acpi_walk_callback user_function,void * context,void ** return_value)783 acpi_get_devices(const char *HID,
784 acpi_walk_callback user_function,
785 void *context, void **return_value)
786 {
787 acpi_status status;
788 struct acpi_get_devices_info info;
789
790 ACPI_FUNCTION_TRACE(acpi_get_devices);
791
792 /* Parameter validation */
793
794 if (!user_function) {
795 return_ACPI_STATUS(AE_BAD_PARAMETER);
796 }
797
798 /*
799 * We're going to call their callback from OUR callback, so we need
800 * to know what it is, and their context parameter.
801 */
802 info.hid = HID;
803 info.context = context;
804 info.user_function = user_function;
805
806 /*
807 * Lock the namespace around the walk.
808 * The namespace will be unlocked/locked around each call
809 * to the user function - since this function
810 * must be allowed to make Acpi calls itself.
811 */
812 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
813 if (ACPI_FAILURE(status)) {
814 return_ACPI_STATUS(status);
815 }
816
817 status = acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
818 ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
819 acpi_ns_get_device_callback, NULL,
820 &info, return_value);
821
822 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
823 return_ACPI_STATUS(status);
824 }
825
ACPI_EXPORT_SYMBOL(acpi_get_devices)826 ACPI_EXPORT_SYMBOL(acpi_get_devices)
827
828 /*******************************************************************************
829 *
830 * FUNCTION: acpi_attach_data
831 *
832 * PARAMETERS: obj_handle - Namespace node
833 * handler - Handler for this attachment
834 * data - Pointer to data to be attached
835 *
836 * RETURN: Status
837 *
838 * DESCRIPTION: Attach arbitrary data and handler to a namespace node.
839 *
840 ******************************************************************************/
841 acpi_status
842 acpi_attach_data(acpi_handle obj_handle,
843 acpi_object_handler handler, void *data)
844 {
845 struct acpi_namespace_node *node;
846 acpi_status status;
847
848 /* Parameter validation */
849
850 if (!obj_handle || !handler || !data) {
851 return (AE_BAD_PARAMETER);
852 }
853
854 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
855 if (ACPI_FAILURE(status)) {
856 return (status);
857 }
858
859 /* Convert and validate the handle */
860
861 node = acpi_ns_validate_handle(obj_handle);
862 if (!node) {
863 status = AE_BAD_PARAMETER;
864 goto unlock_and_exit;
865 }
866
867 status = acpi_ns_attach_data(node, handler, data);
868
869 unlock_and_exit:
870 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
871 return (status);
872 }
873
ACPI_EXPORT_SYMBOL(acpi_attach_data)874 ACPI_EXPORT_SYMBOL(acpi_attach_data)
875
876 /*******************************************************************************
877 *
878 * FUNCTION: acpi_detach_data
879 *
880 * PARAMETERS: obj_handle - Namespace node handle
881 * handler - Handler used in call to acpi_attach_data
882 *
883 * RETURN: Status
884 *
885 * DESCRIPTION: Remove data that was previously attached to a node.
886 *
887 ******************************************************************************/
888 acpi_status
889 acpi_detach_data(acpi_handle obj_handle, acpi_object_handler handler)
890 {
891 struct acpi_namespace_node *node;
892 acpi_status status;
893
894 /* Parameter validation */
895
896 if (!obj_handle || !handler) {
897 return (AE_BAD_PARAMETER);
898 }
899
900 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
901 if (ACPI_FAILURE(status)) {
902 return (status);
903 }
904
905 /* Convert and validate the handle */
906
907 node = acpi_ns_validate_handle(obj_handle);
908 if (!node) {
909 status = AE_BAD_PARAMETER;
910 goto unlock_and_exit;
911 }
912
913 status = acpi_ns_detach_data(node, handler);
914
915 unlock_and_exit:
916 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
917 return (status);
918 }
919
ACPI_EXPORT_SYMBOL(acpi_detach_data)920 ACPI_EXPORT_SYMBOL(acpi_detach_data)
921
922 /*******************************************************************************
923 *
924 * FUNCTION: acpi_get_data_full
925 *
926 * PARAMETERS: obj_handle - Namespace node
927 * handler - Handler used in call to attach_data
928 * data - Where the data is returned
929 * callback - function to execute before returning
930 *
931 * RETURN: Status
932 *
933 * DESCRIPTION: Retrieve data that was previously attached to a namespace node
934 * and execute a callback before returning.
935 *
936 ******************************************************************************/
937 acpi_status
938 acpi_get_data_full(acpi_handle obj_handle, acpi_object_handler handler,
939 void **data, void (*callback)(void *))
940 {
941 struct acpi_namespace_node *node;
942 acpi_status status;
943
944 /* Parameter validation */
945
946 if (!obj_handle || !handler || !data) {
947 return (AE_BAD_PARAMETER);
948 }
949
950 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
951 if (ACPI_FAILURE(status)) {
952 return (status);
953 }
954
955 /* Convert and validate the handle */
956
957 node = acpi_ns_validate_handle(obj_handle);
958 if (!node) {
959 status = AE_BAD_PARAMETER;
960 goto unlock_and_exit;
961 }
962
963 status = acpi_ns_get_attached_data(node, handler, data);
964 if (ACPI_SUCCESS(status) && callback) {
965 callback(*data);
966 }
967
968 unlock_and_exit:
969 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
970 return (status);
971 }
972
ACPI_EXPORT_SYMBOL(acpi_get_data_full)973 ACPI_EXPORT_SYMBOL(acpi_get_data_full)
974
975 /*******************************************************************************
976 *
977 * FUNCTION: acpi_get_data
978 *
979 * PARAMETERS: obj_handle - Namespace node
980 * handler - Handler used in call to attach_data
981 * data - Where the data is returned
982 *
983 * RETURN: Status
984 *
985 * DESCRIPTION: Retrieve data that was previously attached to a namespace node.
986 *
987 ******************************************************************************/
988 acpi_status
989 acpi_get_data(acpi_handle obj_handle, acpi_object_handler handler, void **data)
990 {
991 return acpi_get_data_full(obj_handle, handler, data, NULL);
992 }
993
994 ACPI_EXPORT_SYMBOL(acpi_get_data)
995