1 /*******************************************************************************
3 * Module Name: nsxfeval - Public interfaces to the ACPI subsystem
4 * ACPI Object evaluation interfaces
6 ******************************************************************************/
9 * Copyright (C) 2000 - 2017, Intel Corp.
10 * All rights reserved.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions, and the following disclaimer,
17 * without modification.
18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19 * substantially similar to the "NO WARRANTY" disclaimer below
20 * ("Disclaimer") and any redistribution must be conditioned upon
21 * including a substantially similar Disclaimer requirement for further
22 * binary redistribution.
23 * 3. Neither the names of the above-listed copyright holders nor the names
24 * of any contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
27 * Alternatively, this software may be distributed under the terms of the
28 * GNU General Public License ("GPL") version 2 as published by the Free
29 * Software Foundation.
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
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38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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42 * POSSIBILITY OF SUCH DAMAGES.
45 #define EXPORT_ACPI_INTERFACES
47 #include <acpi/acpi.h>
52 #define _COMPONENT ACPI_NAMESPACE
53 ACPI_MODULE_NAME("nsxfeval")
55 /* Local prototypes */
56 static void acpi_ns_resolve_references(struct acpi_evaluate_info *info);
58 /*******************************************************************************
60 * FUNCTION: acpi_evaluate_object_typed
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
73 * DESCRIPTION: Find and evaluate the given object, passing the given
74 * parameters if necessary. One of "Handle" or "Pathname" must
77 ******************************************************************************/
80 acpi_evaluate_object_typed(acpi_handle handle,
82 struct acpi_object_list *external_params,
83 struct acpi_buffer *return_buffer,
84 acpi_object_type return_type)
87 u8 free_buffer_on_error = FALSE;
88 acpi_handle target_handle;
91 ACPI_FUNCTION_TRACE(acpi_evaluate_object_typed);
93 /* Return buffer must be valid */
96 return_ACPI_STATUS(AE_BAD_PARAMETER);
99 if (return_buffer->length == ACPI_ALLOCATE_BUFFER) {
100 free_buffer_on_error = TRUE;
104 status = acpi_get_handle(handle, pathname, &target_handle);
105 if (ACPI_FAILURE(status)) {
106 return_ACPI_STATUS(status);
109 target_handle = handle;
112 full_pathname = acpi_ns_get_external_pathname(target_handle);
113 if (!full_pathname) {
114 return_ACPI_STATUS(AE_NO_MEMORY);
117 /* Evaluate the object */
119 status = acpi_evaluate_object(target_handle, NULL, external_params,
121 if (ACPI_FAILURE(status)) {
125 /* Type ANY means "don't care about return value type" */
127 if (return_type == ACPI_TYPE_ANY) {
131 if (return_buffer->length == 0) {
133 /* Error because caller specifically asked for a return value */
135 ACPI_ERROR((AE_INFO, "%s did not return any object",
137 status = AE_NULL_OBJECT;
141 /* Examine the object type returned from evaluate_object */
143 if (((union acpi_object *)return_buffer->pointer)->type == return_type) {
147 /* Return object type does not match requested type */
150 "Incorrect return type from %s - received [%s], requested [%s]",
152 acpi_ut_get_type_name(((union acpi_object *)return_buffer->
154 acpi_ut_get_type_name(return_type)));
156 if (free_buffer_on_error) {
158 * Free a buffer created via ACPI_ALLOCATE_BUFFER.
159 * Note: We use acpi_os_free here because acpi_os_allocate was used
160 * to allocate the buffer. This purposefully bypasses the
161 * (optionally enabled) allocation tracking mechanism since we
162 * only want to track internal allocations.
164 acpi_os_free(return_buffer->pointer);
165 return_buffer->pointer = NULL;
168 return_buffer->length = 0;
172 ACPI_FREE(full_pathname);
173 return_ACPI_STATUS(status);
176 ACPI_EXPORT_SYMBOL(acpi_evaluate_object_typed)
178 /*******************************************************************************
180 * FUNCTION: acpi_evaluate_object
182 * PARAMETERS: handle - Object handle (optional)
183 * pathname - Object pathname (optional)
184 * external_params - List of parameters to pass to method,
185 * terminated by NULL. May be NULL
186 * if no parameters are being passed.
187 * return_buffer - Where to put method's return value (if
188 * any). If NULL, no value is returned.
192 * DESCRIPTION: Find and evaluate the given object, passing the given
193 * parameters if necessary. One of "Handle" or "Pathname" must
194 * be valid (non-null)
196 ******************************************************************************/
198 acpi_evaluate_object(acpi_handle handle,
199 acpi_string pathname,
200 struct acpi_object_list *external_params,
201 struct acpi_buffer *return_buffer)
204 struct acpi_evaluate_info *info;
205 acpi_size buffer_space_needed;
208 ACPI_FUNCTION_TRACE(acpi_evaluate_object);
210 /* Allocate and initialize the evaluation information block */
212 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
214 return_ACPI_STATUS(AE_NO_MEMORY);
217 /* Convert and validate the device handle */
219 info->prefix_node = acpi_ns_validate_handle(handle);
220 if (!info->prefix_node) {
221 status = AE_BAD_PARAMETER;
226 * Get the actual namespace node for the target object.
227 * Handles these cases:
229 * 1) Null node, valid pathname from root (absolute path)
230 * 2) Node and valid pathname (path relative to Node)
231 * 3) Node, Null pathname
233 if ((pathname) && (ACPI_IS_ROOT_PREFIX(pathname[0]))) {
235 /* The path is fully qualified, just evaluate by name */
237 info->prefix_node = NULL;
238 } else if (!handle) {
240 * A handle is optional iff a fully qualified pathname is specified.
241 * Since we've already handled fully qualified names above, this is
245 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
246 "Both Handle and Pathname are NULL"));
248 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
249 "Null Handle with relative pathname [%s]",
253 status = AE_BAD_PARAMETER;
257 info->relative_pathname = pathname;
260 * Convert all external objects passed as arguments to the
261 * internal version(s).
263 if (external_params && external_params->count) {
264 info->param_count = (u16)external_params->count;
266 /* Warn on impossible argument count */
268 if (info->param_count > ACPI_METHOD_NUM_ARGS) {
269 ACPI_WARN_PREDEFINED((AE_INFO, pathname,
271 "Excess arguments (%u) - using only %u",
273 ACPI_METHOD_NUM_ARGS));
275 info->param_count = ACPI_METHOD_NUM_ARGS;
279 * Allocate a new parameter block for the internal objects
280 * Add 1 to count to allow for null terminated internal list
282 info->parameters = ACPI_ALLOCATE_ZEROED(((acpi_size)info->
284 1) * sizeof(void *));
285 if (!info->parameters) {
286 status = AE_NO_MEMORY;
290 /* Convert each external object in the list to an internal object */
292 for (i = 0; i < info->param_count; i++) {
294 acpi_ut_copy_eobject_to_iobject(&external_params->
298 if (ACPI_FAILURE(status)) {
303 info->parameters[info->param_count] = NULL;
306 #ifdef _FUTURE_FEATURE
309 * Begin incoming argument count analysis. Check for too few args
312 switch (acpi_ns_get_type(info->node)) {
313 case ACPI_TYPE_METHOD:
315 /* Check incoming argument count against the method definition */
317 if (info->obj_desc->method.param_count > info->param_count) {
319 "Insufficient arguments (%u) - %u are required",
321 info->obj_desc->method.param_count));
323 status = AE_MISSING_ARGUMENTS;
327 else if (info->obj_desc->method.param_count < info->param_count) {
328 ACPI_WARNING((AE_INFO,
329 "Excess arguments (%u) - only %u are required",
331 info->obj_desc->method.param_count));
333 /* Just pass the required number of arguments */
335 info->param_count = info->obj_desc->method.param_count;
339 * Any incoming external objects to be passed as arguments to the
340 * method must be converted to internal objects
342 if (info->param_count) {
344 * Allocate a new parameter block for the internal objects
345 * Add 1 to count to allow for null terminated internal list
347 info->parameters = ACPI_ALLOCATE_ZEROED(((acpi_size)
352 if (!info->parameters) {
353 status = AE_NO_MEMORY;
357 /* Convert each external object in the list to an internal object */
359 for (i = 0; i < info->param_count; i++) {
361 acpi_ut_copy_eobject_to_iobject
362 (&external_params->pointer[i],
363 &info->parameters[i]);
364 if (ACPI_FAILURE(status)) {
369 info->parameters[info->param_count] = NULL;
375 /* Warn if arguments passed to an object that is not a method */
377 if (info->param_count) {
378 ACPI_WARNING((AE_INFO,
379 "%u arguments were passed to a non-method ACPI object",
387 /* Now we can evaluate the object */
389 status = acpi_ns_evaluate(info);
392 * If we are expecting a return value, and all went well above,
393 * copy the return value to an external object.
395 if (!return_buffer) {
396 goto cleanup_return_object;
399 if (!info->return_object) {
400 return_buffer->length = 0;
404 if (ACPI_GET_DESCRIPTOR_TYPE(info->return_object) ==
405 ACPI_DESC_TYPE_NAMED) {
407 * If we received a NS Node as a return object, this means that
408 * the object we are evaluating has nothing interesting to
409 * return (such as a mutex, etc.) We return an error because
410 * these types are essentially unsupported by this interface.
411 * We don't check up front because this makes it easier to add
412 * support for various types at a later date if necessary.
415 info->return_object = NULL; /* No need to delete a NS Node */
416 return_buffer->length = 0;
419 if (ACPI_FAILURE(status)) {
420 goto cleanup_return_object;
423 /* Dereference Index and ref_of references */
425 acpi_ns_resolve_references(info);
427 /* Get the size of the returned object */
429 status = acpi_ut_get_object_size(info->return_object,
430 &buffer_space_needed);
431 if (ACPI_SUCCESS(status)) {
433 /* Validate/Allocate/Clear caller buffer */
435 status = acpi_ut_initialize_buffer(return_buffer,
436 buffer_space_needed);
437 if (ACPI_FAILURE(status)) {
439 * Caller's buffer is too small or a new one can't
442 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
443 "Needed buffer size %X, %s\n",
444 (u32)buffer_space_needed,
445 acpi_format_exception(status)));
447 /* We have enough space for the object, build it */
450 acpi_ut_copy_iobject_to_eobject(info->return_object,
455 cleanup_return_object:
457 if (info->return_object) {
459 * Delete the internal return object. NOTE: Interpreter must be
460 * locked to avoid race condition.
462 acpi_ex_enter_interpreter();
464 /* Remove one reference on the return object (should delete it) */
466 acpi_ut_remove_reference(info->return_object);
467 acpi_ex_exit_interpreter();
472 /* Free the input parameter list (if we created one) */
474 if (info->parameters) {
476 /* Free the allocated parameter block */
478 acpi_ut_delete_internal_object_list(info->parameters);
482 return_ACPI_STATUS(status);
485 ACPI_EXPORT_SYMBOL(acpi_evaluate_object)
487 /*******************************************************************************
489 * FUNCTION: acpi_ns_resolve_references
491 * PARAMETERS: info - Evaluation info block
493 * RETURN: Info->return_object is replaced with the dereferenced object
495 * DESCRIPTION: Dereference certain reference objects. Called before an
496 * internal return object is converted to an external union acpi_object.
498 * Performs an automatic dereference of Index and ref_of reference objects.
499 * These reference objects are not supported by the union acpi_object, so this is a
500 * last resort effort to return something useful. Also, provides compatibility
501 * with other ACPI implementations.
503 * NOTE: does not handle references within returned package objects or nested
504 * references, but this support could be added later if found to be necessary.
506 ******************************************************************************/
507 static void acpi_ns_resolve_references(struct acpi_evaluate_info *info)
509 union acpi_operand_object *obj_desc = NULL;
510 struct acpi_namespace_node *node;
512 /* We are interested in reference objects only */
514 if ((info->return_object)->common.type != ACPI_TYPE_LOCAL_REFERENCE) {
519 * Two types of references are supported - those created by Index and
520 * ref_of operators. A name reference (AML_NAMEPATH_OP) can be converted
521 * to a union acpi_object, so it is not dereferenced here. A ddb_handle
522 * (AML_LOAD_OP) cannot be dereferenced, nor can it be converted to
523 * a union acpi_object.
525 switch (info->return_object->reference.class) {
526 case ACPI_REFCLASS_INDEX:
528 obj_desc = *(info->return_object->reference.where);
531 case ACPI_REFCLASS_REFOF:
533 node = info->return_object->reference.object;
535 obj_desc = node->object;
544 /* Replace the existing reference object */
547 acpi_ut_add_reference(obj_desc);
548 acpi_ut_remove_reference(info->return_object);
549 info->return_object = obj_desc;
555 /*******************************************************************************
557 * FUNCTION: acpi_walk_namespace
559 * PARAMETERS: type - acpi_object_type to search for
560 * start_object - Handle in namespace where search begins
561 * max_depth - Depth to which search is to reach
562 * descending_callback - Called during tree descent
563 * when an object of "Type" is found
564 * ascending_callback - Called during tree ascent
565 * when an object of "Type" is found
566 * context - Passed to user function(s) above
567 * return_value - Location where return value of
568 * user_function is put if terminated early
570 * RETURNS Return value from the user_function if terminated early.
571 * Otherwise, returns NULL.
573 * DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
574 * starting (and ending) at the object specified by start_handle.
575 * The callback function is called whenever an object that matches
576 * the type parameter is found. If the callback function returns
577 * a non-zero value, the search is terminated immediately and this
578 * value is returned to the caller.
580 * The point of this procedure is to provide a generic namespace
581 * walk routine that can be called from multiple places to
582 * provide multiple services; the callback function(s) can be
583 * tailored to each task, whether it is a print function,
584 * a compare function, etc.
586 ******************************************************************************/
589 acpi_walk_namespace(acpi_object_type type,
590 acpi_handle start_object,
592 acpi_walk_callback descending_callback,
593 acpi_walk_callback ascending_callback,
594 void *context, void **return_value)
598 ACPI_FUNCTION_TRACE(acpi_walk_namespace);
600 /* Parameter validation */
602 if ((type > ACPI_TYPE_LOCAL_MAX) ||
603 (!max_depth) || (!descending_callback && !ascending_callback)) {
604 return_ACPI_STATUS(AE_BAD_PARAMETER);
608 * Need to acquire the namespace reader lock to prevent interference
609 * with any concurrent table unloads (which causes the deletion of
610 * namespace objects). We cannot allow the deletion of a namespace node
611 * while the user function is using it. The exception to this are the
612 * nodes created and deleted during control method execution -- these
613 * nodes are marked as temporary nodes and are ignored by the namespace
614 * walk. Thus, control methods can be executed while holding the
615 * namespace deletion lock (and the user function can execute control
618 status = acpi_ut_acquire_read_lock(&acpi_gbl_namespace_rw_lock);
619 if (ACPI_FAILURE(status)) {
620 return_ACPI_STATUS(status);
624 * Lock the namespace around the walk. The namespace will be
625 * unlocked/locked around each call to the user function - since the user
626 * function must be allowed to make ACPICA calls itself (for example, it
627 * will typically execute control methods during device enumeration.)
629 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
630 if (ACPI_FAILURE(status)) {
631 goto unlock_and_exit;
634 /* Now we can validate the starting node */
636 if (!acpi_ns_validate_handle(start_object)) {
637 status = AE_BAD_PARAMETER;
638 goto unlock_and_exit2;
641 status = acpi_ns_walk_namespace(type, start_object, max_depth,
643 descending_callback, ascending_callback,
644 context, return_value);
647 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
650 (void)acpi_ut_release_read_lock(&acpi_gbl_namespace_rw_lock);
651 return_ACPI_STATUS(status);
654 ACPI_EXPORT_SYMBOL(acpi_walk_namespace)
656 /*******************************************************************************
658 * FUNCTION: acpi_ns_get_device_callback
660 * PARAMETERS: Callback from acpi_get_device
664 * DESCRIPTION: Takes callbacks from walk_namespace and filters out all non-
665 * present devices, or if they specified a HID, it filters based
668 ******************************************************************************/
670 acpi_ns_get_device_callback(acpi_handle obj_handle,
672 void *context, void **return_value)
674 struct acpi_get_devices_info *info = context;
676 struct acpi_namespace_node *node;
678 struct acpi_pnp_device_id *hid;
679 struct acpi_pnp_device_id_list *cid;
684 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
685 if (ACPI_FAILURE(status)) {
689 node = acpi_ns_validate_handle(obj_handle);
690 status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
691 if (ACPI_FAILURE(status)) {
696 return (AE_BAD_PARAMETER);
700 * First, filter based on the device HID and CID.
702 * 01/2010: For this case where a specific HID is requested, we don't
703 * want to run _STA until we have an actual HID match. Thus, we will
704 * not unnecessarily execute _STA on devices for which the caller
705 * doesn't care about. Previously, _STA was executed unconditionally
706 * on all devices found here.
708 * A side-effect of this change is that now we will continue to search
709 * for a matching HID even under device trees where the parent device
710 * would have returned a _STA that indicates it is not present or
711 * not functioning (thus aborting the search on that branch).
713 if (info->hid != NULL) {
714 status = acpi_ut_execute_HID(node, &hid);
715 if (status == AE_NOT_FOUND) {
717 } else if (ACPI_FAILURE(status)) {
718 return (AE_CTRL_DEPTH);
721 no_match = strcmp(hid->string, info->hid);
726 * HID does not match, attempt match within the
727 * list of Compatible IDs (CIDs)
729 status = acpi_ut_execute_CID(node, &cid);
730 if (status == AE_NOT_FOUND) {
732 } else if (ACPI_FAILURE(status)) {
733 return (AE_CTRL_DEPTH);
736 /* Walk the CID list */
739 for (i = 0; i < cid->count; i++) {
740 if (strcmp(cid->ids[i].string, info->hid) == 0) {
742 /* Found a matching CID */
756 /* Run _STA to determine if device is present */
758 status = acpi_ut_execute_STA(node, &flags);
759 if (ACPI_FAILURE(status)) {
760 return (AE_CTRL_DEPTH);
763 if (!(flags & ACPI_STA_DEVICE_PRESENT) &&
764 !(flags & ACPI_STA_DEVICE_FUNCTIONING)) {
766 * Don't examine the children of the device only when the
767 * device is neither present nor functional. See ACPI spec,
768 * description of _STA for more information.
770 return (AE_CTRL_DEPTH);
773 /* We have a valid device, invoke the user function */
775 status = info->user_function(obj_handle, nesting_level,
776 info->context, return_value);
780 /*******************************************************************************
782 * FUNCTION: acpi_get_devices
784 * PARAMETERS: HID - HID to search for. Can be NULL.
785 * user_function - Called when a matching object is found
786 * context - Passed to user function
787 * return_value - Location where return value of
788 * user_function is put if terminated early
790 * RETURNS Return value from the user_function if terminated early.
791 * Otherwise, returns NULL.
793 * DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
794 * starting (and ending) at the object specified by start_handle.
795 * The user_function is called whenever an object of type
796 * Device is found. If the user function returns
797 * a non-zero value, the search is terminated immediately and this
798 * value is returned to the caller.
800 * This is a wrapper for walk_namespace, but the callback performs
801 * additional filtering. Please see acpi_ns_get_device_callback.
803 ******************************************************************************/
806 acpi_get_devices(const char *HID,
807 acpi_walk_callback user_function,
808 void *context, void **return_value)
811 struct acpi_get_devices_info info;
813 ACPI_FUNCTION_TRACE(acpi_get_devices);
815 /* Parameter validation */
817 if (!user_function) {
818 return_ACPI_STATUS(AE_BAD_PARAMETER);
822 * We're going to call their callback from OUR callback, so we need
823 * to know what it is, and their context parameter.
826 info.context = context;
827 info.user_function = user_function;
830 * Lock the namespace around the walk.
831 * The namespace will be unlocked/locked around each call
832 * to the user function - since this function
833 * must be allowed to make Acpi calls itself.
835 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
836 if (ACPI_FAILURE(status)) {
837 return_ACPI_STATUS(status);
840 status = acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
841 ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
842 acpi_ns_get_device_callback, NULL,
843 &info, return_value);
845 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
846 return_ACPI_STATUS(status);
849 ACPI_EXPORT_SYMBOL(acpi_get_devices)
851 /*******************************************************************************
853 * FUNCTION: acpi_attach_data
855 * PARAMETERS: obj_handle - Namespace node
856 * handler - Handler for this attachment
857 * data - Pointer to data to be attached
861 * DESCRIPTION: Attach arbitrary data and handler to a namespace node.
863 ******************************************************************************/
865 acpi_attach_data(acpi_handle obj_handle,
866 acpi_object_handler handler, void *data)
868 struct acpi_namespace_node *node;
871 /* Parameter validation */
873 if (!obj_handle || !handler || !data) {
874 return (AE_BAD_PARAMETER);
877 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
878 if (ACPI_FAILURE(status)) {
882 /* Convert and validate the handle */
884 node = acpi_ns_validate_handle(obj_handle);
886 status = AE_BAD_PARAMETER;
887 goto unlock_and_exit;
890 status = acpi_ns_attach_data(node, handler, data);
893 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
897 ACPI_EXPORT_SYMBOL(acpi_attach_data)
899 /*******************************************************************************
901 * FUNCTION: acpi_detach_data
903 * PARAMETERS: obj_handle - Namespace node handle
904 * handler - Handler used in call to acpi_attach_data
908 * DESCRIPTION: Remove data that was previously attached to a node.
910 ******************************************************************************/
912 acpi_detach_data(acpi_handle obj_handle, acpi_object_handler handler)
914 struct acpi_namespace_node *node;
917 /* Parameter validation */
919 if (!obj_handle || !handler) {
920 return (AE_BAD_PARAMETER);
923 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
924 if (ACPI_FAILURE(status)) {
928 /* Convert and validate the handle */
930 node = acpi_ns_validate_handle(obj_handle);
932 status = AE_BAD_PARAMETER;
933 goto unlock_and_exit;
936 status = acpi_ns_detach_data(node, handler);
939 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
943 ACPI_EXPORT_SYMBOL(acpi_detach_data)
945 /*******************************************************************************
947 * FUNCTION: acpi_get_data_full
949 * PARAMETERS: obj_handle - Namespace node
950 * handler - Handler used in call to attach_data
951 * data - Where the data is returned
952 * callback - function to execute before returning
956 * DESCRIPTION: Retrieve data that was previously attached to a namespace node
957 * and execute a callback before returning.
959 ******************************************************************************/
961 acpi_get_data_full(acpi_handle obj_handle, acpi_object_handler handler,
962 void **data, void (*callback)(void *))
964 struct acpi_namespace_node *node;
967 /* Parameter validation */
969 if (!obj_handle || !handler || !data) {
970 return (AE_BAD_PARAMETER);
973 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
974 if (ACPI_FAILURE(status)) {
978 /* Convert and validate the handle */
980 node = acpi_ns_validate_handle(obj_handle);
982 status = AE_BAD_PARAMETER;
983 goto unlock_and_exit;
986 status = acpi_ns_get_attached_data(node, handler, data);
987 if (ACPI_SUCCESS(status) && callback) {
992 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
996 ACPI_EXPORT_SYMBOL(acpi_get_data_full)
998 /*******************************************************************************
1000 * FUNCTION: acpi_get_data
1002 * PARAMETERS: obj_handle - Namespace node
1003 * handler - Handler used in call to attach_data
1004 * data - Where the data is returned
1008 * DESCRIPTION: Retrieve data that was previously attached to a namespace node.
1010 ******************************************************************************/
1012 acpi_get_data(acpi_handle obj_handle, acpi_object_handler handler, void **data)
1014 return acpi_get_data_full(obj_handle, handler, data, NULL);
1017 ACPI_EXPORT_SYMBOL(acpi_get_data)