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1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.02/*******************************************************************************3 *4 * Module Name: nsxfeval - Public interfaces to the ACPI subsystem5 * ACPI Object evaluation interfaces6 *7 ******************************************************************************/8 9#define EXPORT_ACPI_INTERFACES10 11#include <acpi/acpi.h>12#include "accommon.h"13#include "acnamesp.h"14#include "acinterp.h"15 16#define _COMPONENT ACPI_NAMESPACE17ACPI_MODULE_NAME("nsxfeval")18 19/* Local prototypes */20static void acpi_ns_resolve_references(struct acpi_evaluate_info *info);21 22/*******************************************************************************23 *24 * FUNCTION: acpi_evaluate_object_typed25 *26 * PARAMETERS: handle - Object handle (optional)27 * pathname - Object pathname (optional)28 * external_params - List of parameters to pass to a method,29 * terminated by NULL. May be NULL30 * if no parameters are being passed.31 * return_buffer - Where to put the object's return value (if32 * any). If NULL, no value is returned.33 * return_type - Expected type of return object34 *35 * RETURN: Status36 *37 * DESCRIPTION: Find and evaluate the given object, passing the given38 * parameters if necessary. One of "Handle" or "Pathname" must39 * be valid (non-null)40 *41 ******************************************************************************/42 43acpi_status44acpi_evaluate_object_typed(acpi_handle handle,45 acpi_string pathname,46 struct acpi_object_list *external_params,47 struct acpi_buffer *return_buffer,48 acpi_object_type return_type)49{50 acpi_status status;51 u8 free_buffer_on_error = FALSE;52 acpi_handle target_handle;53 char *full_pathname;54 55 ACPI_FUNCTION_TRACE(acpi_evaluate_object_typed);56 57 /* Return buffer must be valid */58 59 if (!return_buffer) {60 return_ACPI_STATUS(AE_BAD_PARAMETER);61 }62 63 if (return_buffer->length == ACPI_ALLOCATE_BUFFER) {64 free_buffer_on_error = TRUE;65 }66 67 /* Get a handle here, in order to build an error message if needed */68 69 target_handle = handle;70 if (pathname) {71 status = acpi_get_handle(handle, pathname, &target_handle);72 if (ACPI_FAILURE(status)) {73 return_ACPI_STATUS(status);74 }75 }76 77 full_pathname = acpi_ns_get_external_pathname(target_handle);78 if (!full_pathname) {79 return_ACPI_STATUS(AE_NO_MEMORY);80 }81 82 /* Evaluate the object */83 84 status = acpi_evaluate_object(target_handle, NULL, external_params,85 return_buffer);86 if (ACPI_FAILURE(status)) {87 goto exit;88 }89 90 /* Type ANY means "don't care about return value type" */91 92 if (return_type == ACPI_TYPE_ANY) {93 goto exit;94 }95 96 if (return_buffer->length == 0) {97 98 /* Error because caller specifically asked for a return value */99 100 ACPI_ERROR((AE_INFO, "%s did not return any object",101 full_pathname));102 status = AE_NULL_OBJECT;103 goto exit;104 }105 106 /* Examine the object type returned from evaluate_object */107 108 if (((union acpi_object *)return_buffer->pointer)->type == return_type) {109 goto exit;110 }111 112 /* Return object type does not match requested type */113 114 ACPI_ERROR((AE_INFO,115 "Incorrect return type from %s - received [%s], requested [%s]",116 full_pathname,117 acpi_ut_get_type_name(((union acpi_object *)return_buffer->118 pointer)->type),119 acpi_ut_get_type_name(return_type)));120 121 if (free_buffer_on_error) {122 /*123 * Free a buffer created via ACPI_ALLOCATE_BUFFER.124 * Note: We use acpi_os_free here because acpi_os_allocate was used125 * to allocate the buffer. This purposefully bypasses the126 * (optionally enabled) allocation tracking mechanism since we127 * only want to track internal allocations.128 */129 acpi_os_free(return_buffer->pointer);130 return_buffer->pointer = NULL;131 }132 133 return_buffer->length = 0;134 status = AE_TYPE;135 136exit:137 ACPI_FREE(full_pathname);138 return_ACPI_STATUS(status);139}140 141ACPI_EXPORT_SYMBOL(acpi_evaluate_object_typed)142 143/*******************************************************************************144 *145 * FUNCTION: acpi_evaluate_object146 *147 * PARAMETERS: handle - Object handle (optional)148 * pathname - Object pathname (optional)149 * external_params - List of parameters to pass to method,150 * terminated by NULL. May be NULL151 * if no parameters are being passed.152 * return_buffer - Where to put method's return value (if153 * any). If NULL, no value is returned.154 *155 * RETURN: Status156 *157 * DESCRIPTION: Find and evaluate the given object, passing the given158 * parameters if necessary. One of "Handle" or "Pathname" must159 * be valid (non-null)160 *161 ******************************************************************************/162acpi_status163acpi_evaluate_object(acpi_handle handle,164 acpi_string pathname,165 struct acpi_object_list *external_params,166 struct acpi_buffer *return_buffer)167{168 acpi_status status;169 struct acpi_evaluate_info *info;170 acpi_size buffer_space_needed;171 u32 i;172 173 ACPI_FUNCTION_TRACE(acpi_evaluate_object);174 175 /* Allocate and initialize the evaluation information block */176 177 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));178 if (!info) {179 return_ACPI_STATUS(AE_NO_MEMORY);180 }181 182 /* Convert and validate the device handle */183 184 info->prefix_node = acpi_ns_validate_handle(handle);185 if (!info->prefix_node) {186 status = AE_BAD_PARAMETER;187 goto cleanup;188 }189 190 /*191 * Get the actual namespace node for the target object.192 * Handles these cases:193 *194 * 1) Null node, valid pathname from root (absolute path)195 * 2) Node and valid pathname (path relative to Node)196 * 3) Node, Null pathname197 */198 if ((pathname) && (ACPI_IS_ROOT_PREFIX(pathname[0]))) {199 200 /* The path is fully qualified, just evaluate by name */201 202 info->prefix_node = NULL;203 } else if (!handle) {204 /*205 * A handle is optional iff a fully qualified pathname is specified.206 * Since we've already handled fully qualified names above, this is207 * an error.208 */209 if (!pathname) {210 ACPI_DEBUG_PRINT((ACPI_DB_INFO,211 "Both Handle and Pathname are NULL"));212 } else {213 ACPI_DEBUG_PRINT((ACPI_DB_INFO,214 "Null Handle with relative pathname [%s]",215 pathname));216 }217 218 status = AE_BAD_PARAMETER;219 goto cleanup;220 }221 222 info->relative_pathname = pathname;223 224 /*225 * Convert all external objects passed as arguments to the226 * internal version(s).227 */228 if (external_params && external_params->count) {229 info->param_count = (u16)external_params->count;230 231 /* Warn on impossible argument count */232 233 if (info->param_count > ACPI_METHOD_NUM_ARGS) {234 ACPI_WARN_PREDEFINED((AE_INFO, pathname,235 ACPI_WARN_ALWAYS,236 "Excess arguments (%u) - using only %u",237 info->param_count,238 ACPI_METHOD_NUM_ARGS));239 240 info->param_count = ACPI_METHOD_NUM_ARGS;241 }242 243 /*244 * Allocate a new parameter block for the internal objects245 * Add 1 to count to allow for null terminated internal list246 */247 info->parameters = ACPI_ALLOCATE_ZEROED(((acpi_size)info->248 param_count +249 1) * sizeof(void *));250 if (!info->parameters) {251 status = AE_NO_MEMORY;252 goto cleanup;253 }254 255 /* Convert each external object in the list to an internal object */256 257 for (i = 0; i < info->param_count; i++) {258 status =259 acpi_ut_copy_eobject_to_iobject(&external_params->260 pointer[i],261 &info->262 parameters[i]);263 if (ACPI_FAILURE(status)) {264 goto cleanup;265 }266 }267 268 info->parameters[info->param_count] = NULL;269 }270 271#ifdef _FUTURE_FEATURE272 273 /*274 * Begin incoming argument count analysis. Check for too few args275 * and too many args.276 */277 switch (acpi_ns_get_type(info->node)) {278 case ACPI_TYPE_METHOD:279 280 /* Check incoming argument count against the method definition */281 282 if (info->obj_desc->method.param_count > info->param_count) {283 ACPI_ERROR((AE_INFO,284 "Insufficient arguments (%u) - %u are required",285 info->param_count,286 info->obj_desc->method.param_count));287 288 status = AE_MISSING_ARGUMENTS;289 goto cleanup;290 }291 292 else if (info->obj_desc->method.param_count < info->param_count) {293 ACPI_WARNING((AE_INFO,294 "Excess arguments (%u) - only %u are required",295 info->param_count,296 info->obj_desc->method.param_count));297 298 /* Just pass the required number of arguments */299 300 info->param_count = info->obj_desc->method.param_count;301 }302 303 /*304 * Any incoming external objects to be passed as arguments to the305 * method must be converted to internal objects306 */307 if (info->param_count) {308 /*309 * Allocate a new parameter block for the internal objects310 * Add 1 to count to allow for null terminated internal list311 */312 info->parameters = ACPI_ALLOCATE_ZEROED(((acpi_size)313 info->314 param_count +315 1) *316 sizeof(void *));317 if (!info->parameters) {318 status = AE_NO_MEMORY;319 goto cleanup;320 }321 322 /* Convert each external object in the list to an internal object */323 324 for (i = 0; i < info->param_count; i++) {325 status =326 acpi_ut_copy_eobject_to_iobject327 (&external_params->pointer[i],328 &info->parameters[i]);329 if (ACPI_FAILURE(status)) {330 goto cleanup;331 }332 }333 334 info->parameters[info->param_count] = NULL;335 }336 break;337 338 default:339 340 /* Warn if arguments passed to an object that is not a method */341 342 if (info->param_count) {343 ACPI_WARNING((AE_INFO,344 "%u arguments were passed to a non-method ACPI object",345 info->param_count));346 }347 break;348 }349 350#endif351 352 /* Now we can evaluate the object */353 354 status = acpi_ns_evaluate(info);355 356 /*357 * If we are expecting a return value, and all went well above,358 * copy the return value to an external object.359 */360 if (!return_buffer) {361 goto cleanup_return_object;362 }363 364 if (!info->return_object) {365 return_buffer->length = 0;366 goto cleanup;367 }368 369 if (ACPI_GET_DESCRIPTOR_TYPE(info->return_object) ==370 ACPI_DESC_TYPE_NAMED) {371 /*372 * If we received a NS Node as a return object, this means that373 * the object we are evaluating has nothing interesting to374 * return (such as a mutex, etc.) We return an error because375 * these types are essentially unsupported by this interface.376 * We don't check up front because this makes it easier to add377 * support for various types at a later date if necessary.378 */379 status = AE_TYPE;380 info->return_object = NULL; /* No need to delete a NS Node */381 return_buffer->length = 0;382 }383 384 if (ACPI_FAILURE(status)) {385 goto cleanup_return_object;386 }387 388 /* Dereference Index and ref_of references */389 390 acpi_ns_resolve_references(info);391 392 /* Get the size of the returned object */393 394 status = acpi_ut_get_object_size(info->return_object,395 &buffer_space_needed);396 if (ACPI_SUCCESS(status)) {397 398 /* Validate/Allocate/Clear caller buffer */399 400 status = acpi_ut_initialize_buffer(return_buffer,401 buffer_space_needed);402 if (ACPI_FAILURE(status)) {403 /*404 * Caller's buffer is too small or a new one can't405 * be allocated406 */407 ACPI_DEBUG_PRINT((ACPI_DB_INFO,408 "Needed buffer size %X, %s\n",409 (u32)buffer_space_needed,410 acpi_format_exception(status)));411 } else {412 /* We have enough space for the object, build it */413 414 status =415 acpi_ut_copy_iobject_to_eobject(info->return_object,416 return_buffer);417 }418 }419 420cleanup_return_object:421 422 if (info->return_object) {423 /*424 * Delete the internal return object. NOTE: Interpreter must be425 * locked to avoid race condition.426 */427 acpi_ex_enter_interpreter();428 429 /* Remove one reference on the return object (should delete it) */430 431 acpi_ut_remove_reference(info->return_object);432 acpi_ex_exit_interpreter();433 }434 435cleanup:436 437 /* Free the input parameter list (if we created one) */438 439 if (info->parameters) {440 441 /* Free the allocated parameter block */442 443 acpi_ut_delete_internal_object_list(info->parameters);444 }445 446 ACPI_FREE(info);447 return_ACPI_STATUS(status);448}449 450ACPI_EXPORT_SYMBOL(acpi_evaluate_object)451 452/*******************************************************************************453 *454 * FUNCTION: acpi_ns_resolve_references455 *456 * PARAMETERS: info - Evaluation info block457 *458 * RETURN: Info->return_object is replaced with the dereferenced object459 *460 * DESCRIPTION: Dereference certain reference objects. Called before an461 * internal return object is converted to an external union acpi_object.462 *463 * Performs an automatic dereference of Index and ref_of reference objects.464 * These reference objects are not supported by the union acpi_object, so this is a465 * last resort effort to return something useful. Also, provides compatibility466 * with other ACPI implementations.467 *468 * NOTE: does not handle references within returned package objects or nested469 * references, but this support could be added later if found to be necessary.470 *471 ******************************************************************************/472static void acpi_ns_resolve_references(struct acpi_evaluate_info *info)473{474 union acpi_operand_object *obj_desc = NULL;475 struct acpi_namespace_node *node;476 477 /* We are interested in reference objects only */478 479 if ((info->return_object)->common.type != ACPI_TYPE_LOCAL_REFERENCE) {480 return;481 }482 483 /*484 * Two types of references are supported - those created by Index and485 * ref_of operators. A name reference (AML_NAMEPATH_OP) can be converted486 * to a union acpi_object, so it is not dereferenced here. A ddb_handle487 * (AML_LOAD_OP) cannot be dereferenced, nor can it be converted to488 * a union acpi_object.489 */490 switch (info->return_object->reference.class) {491 case ACPI_REFCLASS_INDEX:492 493 obj_desc = *(info->return_object->reference.where);494 break;495 496 case ACPI_REFCLASS_REFOF:497 498 node = info->return_object->reference.object;499 if (node) {500 obj_desc = node->object;501 }502 break;503 504 default:505 506 return;507 }508 509 /* Replace the existing reference object */510 511 if (obj_desc) {512 acpi_ut_add_reference(obj_desc);513 acpi_ut_remove_reference(info->return_object);514 info->return_object = obj_desc;515 }516 517 return;518}519 520/*******************************************************************************521 *522 * FUNCTION: acpi_walk_namespace523 *524 * PARAMETERS: type - acpi_object_type to search for525 * start_object - Handle in namespace where search begins526 * max_depth - Depth to which search is to reach527 * descending_callback - Called during tree descent528 * when an object of "Type" is found529 * ascending_callback - Called during tree ascent530 * when an object of "Type" is found531 * context - Passed to user function(s) above532 * return_value - Location where return value of533 * user_function is put if terminated early534 *535 * RETURNS Return value from the user_function if terminated early.536 * Otherwise, returns NULL.537 *538 * DESCRIPTION: Performs a modified depth-first walk of the namespace tree,539 * starting (and ending) at the object specified by start_handle.540 * The callback function is called whenever an object that matches541 * the type parameter is found. If the callback function returns542 * a non-zero value, the search is terminated immediately and this543 * value is returned to the caller.544 *545 * The point of this procedure is to provide a generic namespace546 * walk routine that can be called from multiple places to547 * provide multiple services; the callback function(s) can be548 * tailored to each task, whether it is a print function,549 * a compare function, etc.550 *551 ******************************************************************************/552 553acpi_status554acpi_walk_namespace(acpi_object_type type,555 acpi_handle start_object,556 u32 max_depth,557 acpi_walk_callback descending_callback,558 acpi_walk_callback ascending_callback,559 void *context, void **return_value)560{561 acpi_status status;562 563 ACPI_FUNCTION_TRACE(acpi_walk_namespace);564 565 /* Parameter validation */566 567 if ((type > ACPI_TYPE_LOCAL_MAX) ||568 (!max_depth) || (!descending_callback && !ascending_callback)) {569 return_ACPI_STATUS(AE_BAD_PARAMETER);570 }571 572 /*573 * Need to acquire the namespace reader lock to prevent interference574 * with any concurrent table unloads (which causes the deletion of575 * namespace objects). We cannot allow the deletion of a namespace node576 * while the user function is using it. The exception to this are the577 * nodes created and deleted during control method execution -- these578 * nodes are marked as temporary nodes and are ignored by the namespace579 * walk. Thus, control methods can be executed while holding the580 * namespace deletion lock (and the user function can execute control581 * methods.)582 */583 status = acpi_ut_acquire_read_lock(&acpi_gbl_namespace_rw_lock);584 if (ACPI_FAILURE(status)) {585 return_ACPI_STATUS(status);586 }587 588 /*589 * Lock the namespace around the walk. The namespace will be590 * unlocked/locked around each call to the user function - since the user591 * function must be allowed to make ACPICA calls itself (for example, it592 * will typically execute control methods during device enumeration.)593 */594 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);595 if (ACPI_FAILURE(status)) {596 goto unlock_and_exit;597 }598 599 /* Now we can validate the starting node */600 601 if (!acpi_ns_validate_handle(start_object)) {602 status = AE_BAD_PARAMETER;603 goto unlock_and_exit2;604 }605 606 status = acpi_ns_walk_namespace(type, start_object, max_depth,607 ACPI_NS_WALK_UNLOCK,608 descending_callback, ascending_callback,609 context, return_value);610 611unlock_and_exit2:612 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);613 614unlock_and_exit:615 (void)acpi_ut_release_read_lock(&acpi_gbl_namespace_rw_lock);616 return_ACPI_STATUS(status);617}618 619ACPI_EXPORT_SYMBOL(acpi_walk_namespace)620 621/*******************************************************************************622 *623 * FUNCTION: acpi_ns_get_device_callback624 *625 * PARAMETERS: Callback from acpi_get_device626 *627 * RETURN: Status628 *629 * DESCRIPTION: Takes callbacks from walk_namespace and filters out all non-630 * present devices, or if they specified a HID, it filters based631 * on that.632 *633 ******************************************************************************/634static acpi_status635acpi_ns_get_device_callback(acpi_handle obj_handle,636 u32 nesting_level,637 void *context, void **return_value)638{639 struct acpi_get_devices_info *info = context;640 acpi_status status;641 struct acpi_namespace_node *node;642 u32 flags;643 struct acpi_pnp_device_id *hid;644 struct acpi_pnp_device_id_list *cid;645 u32 i;646 u8 found;647 int no_match;648 649 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);650 if (ACPI_FAILURE(status)) {651 return (status);652 }653 654 node = acpi_ns_validate_handle(obj_handle);655 status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);656 if (ACPI_FAILURE(status)) {657 return (status);658 }659 660 if (!node) {661 return (AE_BAD_PARAMETER);662 }663 664 /*665 * First, filter based on the device HID and CID.666 *667 * 01/2010: For this case where a specific HID is requested, we don't668 * want to run _STA until we have an actual HID match. Thus, we will669 * not unnecessarily execute _STA on devices for which the caller670 * doesn't care about. Previously, _STA was executed unconditionally671 * on all devices found here.672 *673 * A side-effect of this change is that now we will continue to search674 * for a matching HID even under device trees where the parent device675 * would have returned a _STA that indicates it is not present or676 * not functioning (thus aborting the search on that branch).677 */678 if (info->hid != NULL) {679 status = acpi_ut_execute_HID(node, &hid);680 if (status == AE_NOT_FOUND) {681 return (AE_OK);682 } else if (ACPI_FAILURE(status)) {683 return (AE_CTRL_DEPTH);684 }685 686 no_match = strcmp(hid->string, info->hid);687 ACPI_FREE(hid);688 689 if (no_match) {690 /*691 * HID does not match, attempt match within the692 * list of Compatible IDs (CIDs)693 */694 status = acpi_ut_execute_CID(node, &cid);695 if (status == AE_NOT_FOUND) {696 return (AE_OK);697 } else if (ACPI_FAILURE(status)) {698 return (AE_CTRL_DEPTH);699 }700 701 /* Walk the CID list */702 703 found = FALSE;704 for (i = 0; i < cid->count; i++) {705 if (strcmp(cid->ids[i].string, info->hid) == 0) {706 707 /* Found a matching CID */708 709 found = TRUE;710 break;711 }712 }713 714 ACPI_FREE(cid);715 if (!found) {716 return (AE_OK);717 }718 }719 }720 721 /* Run _STA to determine if device is present */722 723 status = acpi_ut_execute_STA(node, &flags);724 if (ACPI_FAILURE(status)) {725 return (AE_CTRL_DEPTH);726 }727 728 if (!(flags & ACPI_STA_DEVICE_PRESENT) &&729 !(flags & ACPI_STA_DEVICE_FUNCTIONING)) {730 /*731 * Don't examine the children of the device only when the732 * device is neither present nor functional. See ACPI spec,733 * description of _STA for more information.734 */735 return (AE_CTRL_DEPTH);736 }737 738 /* We have a valid device, invoke the user function */739 740 status = info->user_function(obj_handle, nesting_level,741 info->context, return_value);742 return (status);743}744 745/*******************************************************************************746 *747 * FUNCTION: acpi_get_devices748 *749 * PARAMETERS: HID - HID to search for. Can be NULL.750 * user_function - Called when a matching object is found751 * context - Passed to user function752 * return_value - Location where return value of753 * user_function is put if terminated early754 *755 * RETURNS Return value from the user_function if terminated early.756 * Otherwise, returns NULL.757 *758 * DESCRIPTION: Performs a modified depth-first walk of the namespace tree,759 * starting (and ending) at the object specified by start_handle.760 * The user_function is called whenever an object of type761 * Device is found. If the user function returns762 * a non-zero value, the search is terminated immediately and this763 * value is returned to the caller.764 *765 * This is a wrapper for walk_namespace, but the callback performs766 * additional filtering. Please see acpi_ns_get_device_callback.767 *768 ******************************************************************************/769 770acpi_status771acpi_get_devices(const char *HID,772 acpi_walk_callback user_function,773 void *context, void **return_value)774{775 acpi_status status;776 struct acpi_get_devices_info info;777 778 ACPI_FUNCTION_TRACE(acpi_get_devices);779 780 /* Parameter validation */781 782 if (!user_function) {783 return_ACPI_STATUS(AE_BAD_PARAMETER);784 }785 786 /*787 * We're going to call their callback from OUR callback, so we need788 * to know what it is, and their context parameter.789 */790 info.hid = HID;791 info.context = context;792 info.user_function = user_function;793 794 /*795 * Lock the namespace around the walk.796 * The namespace will be unlocked/locked around each call797 * to the user function - since this function798 * must be allowed to make Acpi calls itself.799 */800 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);801 if (ACPI_FAILURE(status)) {802 return_ACPI_STATUS(status);803 }804 805 status = acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,806 ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,807 acpi_ns_get_device_callback, NULL,808 &info, return_value);809 810 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);811 return_ACPI_STATUS(status);812}813 814ACPI_EXPORT_SYMBOL(acpi_get_devices)815 816/*******************************************************************************817 *818 * FUNCTION: acpi_attach_data819 *820 * PARAMETERS: obj_handle - Namespace node821 * handler - Handler for this attachment822 * data - Pointer to data to be attached823 *824 * RETURN: Status825 *826 * DESCRIPTION: Attach arbitrary data and handler to a namespace node.827 *828 ******************************************************************************/829acpi_status830acpi_attach_data(acpi_handle obj_handle,831 acpi_object_handler handler, void *data)832{833 struct acpi_namespace_node *node;834 acpi_status status;835 836 /* Parameter validation */837 838 if (!obj_handle || !handler || !data) {839 return (AE_BAD_PARAMETER);840 }841 842 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);843 if (ACPI_FAILURE(status)) {844 return (status);845 }846 847 /* Convert and validate the handle */848 849 node = acpi_ns_validate_handle(obj_handle);850 if (!node) {851 status = AE_BAD_PARAMETER;852 goto unlock_and_exit;853 }854 855 status = acpi_ns_attach_data(node, handler, data);856 857unlock_and_exit:858 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);859 return (status);860}861 862ACPI_EXPORT_SYMBOL(acpi_attach_data)863 864/*******************************************************************************865 *866 * FUNCTION: acpi_detach_data867 *868 * PARAMETERS: obj_handle - Namespace node handle869 * handler - Handler used in call to acpi_attach_data870 *871 * RETURN: Status872 *873 * DESCRIPTION: Remove data that was previously attached to a node.874 *875 ******************************************************************************/876acpi_status877acpi_detach_data(acpi_handle obj_handle, acpi_object_handler handler)878{879 struct acpi_namespace_node *node;880 acpi_status status;881 882 /* Parameter validation */883 884 if (!obj_handle || !handler) {885 return (AE_BAD_PARAMETER);886 }887 888 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);889 if (ACPI_FAILURE(status)) {890 return (status);891 }892 893 /* Convert and validate the handle */894 895 node = acpi_ns_validate_handle(obj_handle);896 if (!node) {897 status = AE_BAD_PARAMETER;898 goto unlock_and_exit;899 }900 901 status = acpi_ns_detach_data(node, handler);902 903unlock_and_exit:904 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);905 return (status);906}907 908ACPI_EXPORT_SYMBOL(acpi_detach_data)909 910/*******************************************************************************911 *912 * FUNCTION: acpi_get_data_full913 *914 * PARAMETERS: obj_handle - Namespace node915 * handler - Handler used in call to attach_data916 * data - Where the data is returned917 * callback - function to execute before returning918 *919 * RETURN: Status920 *921 * DESCRIPTION: Retrieve data that was previously attached to a namespace node922 * and execute a callback before returning.923 *924 ******************************************************************************/925acpi_status926acpi_get_data_full(acpi_handle obj_handle, acpi_object_handler handler,927 void **data, void (*callback)(void *))928{929 struct acpi_namespace_node *node;930 acpi_status status;931 932 /* Parameter validation */933 934 if (!obj_handle || !handler || !data) {935 return (AE_BAD_PARAMETER);936 }937 938 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);939 if (ACPI_FAILURE(status)) {940 return (status);941 }942 943 /* Convert and validate the handle */944 945 node = acpi_ns_validate_handle(obj_handle);946 if (!node) {947 status = AE_BAD_PARAMETER;948 goto unlock_and_exit;949 }950 951 status = acpi_ns_get_attached_data(node, handler, data);952 if (ACPI_SUCCESS(status) && callback) {953 callback(*data);954 }955 956unlock_and_exit:957 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);958 return (status);959}960 961ACPI_EXPORT_SYMBOL(acpi_get_data_full)962 963/*******************************************************************************964 *965 * FUNCTION: acpi_get_data966 *967 * PARAMETERS: obj_handle - Namespace node968 * handler - Handler used in call to attach_data969 * data - Where the data is returned970 *971 * RETURN: Status972 *973 * DESCRIPTION: Retrieve data that was previously attached to a namespace node.974 *975 ******************************************************************************/976acpi_status977acpi_get_data(acpi_handle obj_handle, acpi_object_handler handler, void **data)978{979 return acpi_get_data_full(obj_handle, handler, data, NULL);980}981 982ACPI_EXPORT_SYMBOL(acpi_get_data)983