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 - 2008, 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#include <acpi/acpi.h> 46#include "accommon.h" 47#include "acnamesp.h" 48#include "acinterp.h" 49 50#define _COMPONENT ACPI_NAMESPACE 51ACPI_MODULE_NAME("nsxfeval") 52 53/* Local prototypes */ 54static void acpi_ns_resolve_references(struct acpi_evaluate_info *info); 55 56/******************************************************************************* 57 * 58 * FUNCTION: acpi_evaluate_object_typed 59 * 60 * PARAMETERS: Handle - Object handle (optional) 61 * Pathname - Object pathname (optional) 62 * external_params - List of parameters to pass to method, 63 * terminated by NULL. May be NULL 64 * if no parameters are being passed. 65 * return_buffer - Where to put method's return value (if 66 * any). If NULL, no value is returned. 67 * return_type - Expected type of return object 68 * 69 * RETURN: Status 70 * 71 * DESCRIPTION: Find and evaluate the given object, passing the given 72 * parameters if necessary. One of "Handle" or "Pathname" must 73 * be valid (non-null) 74 * 75 ******************************************************************************/ 76 77acpi_status 78acpi_evaluate_object_typed(acpi_handle handle, 79 acpi_string pathname, 80 struct acpi_object_list *external_params, 81 struct acpi_buffer *return_buffer, 82 acpi_object_type return_type) 83{ 84 acpi_status status; 85 u8 must_free = FALSE; 86 87 ACPI_FUNCTION_TRACE(acpi_evaluate_object_typed); 88 89 /* Return buffer must be valid */ 90 91 if (!return_buffer) { 92 return_ACPI_STATUS(AE_BAD_PARAMETER); 93 } 94 95 if (return_buffer->length == ACPI_ALLOCATE_BUFFER) { 96 must_free = TRUE; 97 } 98 99 /* Evaluate the object */ 100 101 status = 102 acpi_evaluate_object(handle, pathname, external_params, 103 return_buffer); 104 if (ACPI_FAILURE(status)) { 105 return_ACPI_STATUS(status); 106 } 107 108 /* Type ANY means "don't care" */ 109 110 if (return_type == ACPI_TYPE_ANY) { 111 return_ACPI_STATUS(AE_OK); 112 } 113 114 if (return_buffer->length == 0) { 115 116 /* Error because caller specifically asked for a return value */ 117 118 ACPI_ERROR((AE_INFO, "No return value")); 119 return_ACPI_STATUS(AE_NULL_OBJECT); 120 } 121 122 /* Examine the object type returned from evaluate_object */ 123 124 if (((union acpi_object *)return_buffer->pointer)->type == return_type) { 125 return_ACPI_STATUS(AE_OK); 126 } 127 128 /* Return object type does not match requested type */ 129 130 ACPI_ERROR((AE_INFO, 131 "Incorrect return type [%s] requested [%s]", 132 acpi_ut_get_type_name(((union acpi_object *)return_buffer-> 133 pointer)->type), 134 acpi_ut_get_type_name(return_type))); 135 136 if (must_free) { 137 138 /* Caller used ACPI_ALLOCATE_BUFFER, free the return buffer */ 139 140 ACPI_FREE(return_buffer->pointer); 141 return_buffer->pointer = NULL; 142 } 143 144 return_buffer->length = 0; 145 return_ACPI_STATUS(AE_TYPE); 146} 147 148ACPI_EXPORT_SYMBOL(acpi_evaluate_object_typed) 149 150/******************************************************************************* 151 * 152 * FUNCTION: acpi_evaluate_object 153 * 154 * PARAMETERS: Handle - Object handle (optional) 155 * Pathname - Object pathname (optional) 156 * external_params - List of parameters to pass to method, 157 * terminated by NULL. May be NULL 158 * if no parameters are being passed. 159 * return_buffer - Where to put method's return value (if 160 * any). If NULL, no value is returned. 161 * 162 * RETURN: Status 163 * 164 * DESCRIPTION: Find and evaluate the given object, passing the given 165 * parameters if necessary. One of "Handle" or "Pathname" must 166 * be valid (non-null) 167 * 168 ******************************************************************************/ 169acpi_status 170acpi_evaluate_object(acpi_handle handle, 171 acpi_string pathname, 172 struct acpi_object_list *external_params, 173 struct acpi_buffer *return_buffer) 174{ 175 acpi_status status; 176 struct acpi_evaluate_info *info; 177 acpi_size buffer_space_needed; 178 u32 i; 179 180 ACPI_FUNCTION_TRACE(acpi_evaluate_object); 181 182 /* Allocate and initialize the evaluation information block */ 183 184 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); 185 if (!info) { 186 return_ACPI_STATUS(AE_NO_MEMORY); 187 } 188 189 info->pathname = pathname; 190 191 /* Convert and validate the device handle */ 192 193 info->prefix_node = acpi_ns_map_handle_to_node(handle); 194 if (!info->prefix_node) { 195 status = AE_BAD_PARAMETER; 196 goto cleanup; 197 } 198 199 /* 200 * If there are parameters to be passed to a control method, the external 201 * objects must all be converted to internal objects 202 */ 203 if (external_params && external_params->count) { 204 /* 205 * Allocate a new parameter block for the internal objects 206 * Add 1 to count to allow for null terminated internal list 207 */ 208 info->parameters = ACPI_ALLOCATE_ZEROED(((acpi_size) 209 external_params-> 210 count + 211 1) * sizeof(void *)); 212 if (!info->parameters) { 213 status = AE_NO_MEMORY; 214 goto cleanup; 215 } 216 217 /* Convert each external object in the list to an internal object */ 218 219 for (i = 0; i < external_params->count; i++) { 220 status = 221 acpi_ut_copy_eobject_to_iobject(&external_params-> 222 pointer[i], 223 &info-> 224 parameters[i]); 225 if (ACPI_FAILURE(status)) { 226 goto cleanup; 227 } 228 } 229 info->parameters[external_params->count] = NULL; 230 } 231 232 /* 233 * Three major cases: 234 * 1) Fully qualified pathname 235 * 2) No handle, not fully qualified pathname (error) 236 * 3) Valid handle 237 */ 238 if ((pathname) && (acpi_ns_valid_root_prefix(pathname[0]))) { 239 240 /* The path is fully qualified, just evaluate by name */ 241 242 info->prefix_node = NULL; 243 status = acpi_ns_evaluate(info); 244 } else if (!handle) { 245 /* 246 * A handle is optional iff a fully qualified pathname is specified. 247 * Since we've already handled fully qualified names above, this is 248 * an error 249 */ 250 if (!pathname) { 251 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 252 "Both Handle and Pathname are NULL")); 253 } else { 254 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 255 "Null Handle with relative pathname [%s]", 256 pathname)); 257 } 258 259 status = AE_BAD_PARAMETER; 260 } else { 261 /* We have a namespace a node and a possible relative path */ 262 263 status = acpi_ns_evaluate(info); 264 } 265 266 /* 267 * If we are expecting a return value, and all went well above, 268 * copy the return value to an external object. 269 */ 270 if (return_buffer) { 271 if (!info->return_object) { 272 return_buffer->length = 0; 273 } else { 274 if (ACPI_GET_DESCRIPTOR_TYPE(info->return_object) == 275 ACPI_DESC_TYPE_NAMED) { 276 /* 277 * If we received a NS Node as a return object, this means that 278 * the object we are evaluating has nothing interesting to 279 * return (such as a mutex, etc.) We return an error because 280 * these types are essentially unsupported by this interface. 281 * We don't check up front because this makes it easier to add 282 * support for various types at a later date if necessary. 283 */ 284 status = AE_TYPE; 285 info->return_object = NULL; /* No need to delete a NS Node */ 286 return_buffer->length = 0; 287 } 288 289 if (ACPI_SUCCESS(status)) { 290 291 /* Dereference Index and ref_of references */ 292 293 acpi_ns_resolve_references(info); 294 295 /* Get the size of the returned object */ 296 297 status = 298 acpi_ut_get_object_size(info->return_object, 299 &buffer_space_needed); 300 if (ACPI_SUCCESS(status)) { 301 302 /* Validate/Allocate/Clear caller buffer */ 303 304 status = 305 acpi_ut_initialize_buffer 306 (return_buffer, 307 buffer_space_needed); 308 if (ACPI_FAILURE(status)) { 309 /* 310 * Caller's buffer is too small or a new one can't 311 * be allocated 312 */ 313 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 314 "Needed buffer size %X, %s\n", 315 (u32) 316 buffer_space_needed, 317 acpi_format_exception 318 (status))); 319 } else { 320 /* We have enough space for the object, build it */ 321 322 status = 323 acpi_ut_copy_iobject_to_eobject 324 (info->return_object, 325 return_buffer); 326 } 327 } 328 } 329 } 330 } 331 332 if (info->return_object) { 333 /* 334 * Delete the internal return object. NOTE: Interpreter must be 335 * locked to avoid race condition. 336 */ 337 acpi_ex_enter_interpreter(); 338 339 /* Remove one reference on the return object (should delete it) */ 340 341 acpi_ut_remove_reference(info->return_object); 342 acpi_ex_exit_interpreter(); 343 } 344 345 cleanup: 346 347 /* Free the input parameter list (if we created one) */ 348 349 if (info->parameters) { 350 351 /* Free the allocated parameter block */ 352 353 acpi_ut_delete_internal_object_list(info->parameters); 354 } 355 356 ACPI_FREE(info); 357 return_ACPI_STATUS(status); 358} 359 360ACPI_EXPORT_SYMBOL(acpi_evaluate_object) 361 362/******************************************************************************* 363 * 364 * FUNCTION: acpi_ns_resolve_references 365 * 366 * PARAMETERS: Info - Evaluation info block 367 * 368 * RETURN: Info->return_object is replaced with the dereferenced object 369 * 370 * DESCRIPTION: Dereference certain reference objects. Called before an 371 * internal return object is converted to an external union acpi_object. 372 * 373 * Performs an automatic dereference of Index and ref_of reference objects. 374 * These reference objects are not supported by the union acpi_object, so this is a 375 * last resort effort to return something useful. Also, provides compatibility 376 * with other ACPI implementations. 377 * 378 * NOTE: does not handle references within returned package objects or nested 379 * references, but this support could be added later if found to be necessary. 380 * 381 ******************************************************************************/ 382static void acpi_ns_resolve_references(struct acpi_evaluate_info *info) 383{ 384 union acpi_operand_object *obj_desc = NULL; 385 struct acpi_namespace_node *node; 386 387 /* We are interested in reference objects only */ 388 389 if ((info->return_object)->common.type != ACPI_TYPE_LOCAL_REFERENCE) { 390 return; 391 } 392 393 /* 394 * Two types of references are supported - those created by Index and 395 * ref_of operators. A name reference (AML_NAMEPATH_OP) can be converted 396 * to an union acpi_object, so it is not dereferenced here. A ddb_handle 397 * (AML_LOAD_OP) cannot be dereferenced, nor can it be converted to 398 * an union acpi_object. 399 */ 400 switch (info->return_object->reference.class) { 401 case ACPI_REFCLASS_INDEX: 402 403 obj_desc = *(info->return_object->reference.where); 404 break; 405 406 case ACPI_REFCLASS_REFOF: 407 408 node = info->return_object->reference.object; 409 if (node) { 410 obj_desc = node->object; 411 } 412 break; 413 414 default: 415 return; 416 } 417 418 /* Replace the existing reference object */ 419 420 if (obj_desc) { 421 acpi_ut_add_reference(obj_desc); 422 acpi_ut_remove_reference(info->return_object); 423 info->return_object = obj_desc; 424 } 425 426 return; 427} 428 429/******************************************************************************* 430 * 431 * FUNCTION: acpi_walk_namespace 432 * 433 * PARAMETERS: Type - acpi_object_type to search for 434 * start_object - Handle in namespace where search begins 435 * max_depth - Depth to which search is to reach 436 * user_function - Called when an object of "Type" is found 437 * Context - Passed to user function 438 * return_value - Location where return value of 439 * user_function is put if terminated early 440 * 441 * RETURNS Return value from the user_function if terminated early. 442 * Otherwise, returns NULL. 443 * 444 * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, 445 * starting (and ending) at the object specified by start_handle. 446 * The user_function is called whenever an object that matches 447 * the type parameter is found. If the user function returns 448 * a non-zero value, the search is terminated immediately and this 449 * value is returned to the caller. 450 * 451 * The point of this procedure is to provide a generic namespace 452 * walk routine that can be called from multiple places to 453 * provide multiple services; the User Function can be tailored 454 * to each task, whether it is a print function, a compare 455 * function, etc. 456 * 457 ******************************************************************************/ 458 459acpi_status 460acpi_walk_namespace(acpi_object_type type, 461 acpi_handle start_object, 462 u32 max_depth, 463 acpi_walk_callback user_function, 464 void *context, void **return_value) 465{ 466 acpi_status status; 467 468 ACPI_FUNCTION_TRACE(acpi_walk_namespace); 469 470 /* Parameter validation */ 471 472 if ((type > ACPI_TYPE_LOCAL_MAX) || (!max_depth) || (!user_function)) { 473 return_ACPI_STATUS(AE_BAD_PARAMETER); 474 } 475 476 /* 477 * Need to acquire the namespace reader lock to prevent interference 478 * with any concurrent table unloads (which causes the deletion of 479 * namespace objects). We cannot allow the deletion of a namespace node 480 * while the user function is using it. The exception to this are the 481 * nodes created and deleted during control method execution -- these 482 * nodes are marked as temporary nodes and are ignored by the namespace 483 * walk. Thus, control methods can be executed while holding the 484 * namespace deletion lock (and the user function can execute control 485 * methods.) 486 */ 487 status = acpi_ut_acquire_read_lock(&acpi_gbl_namespace_rw_lock); 488 if (ACPI_FAILURE(status)) { 489 return status; 490 } 491 492 /* 493 * Lock the namespace around the walk. The namespace will be 494 * unlocked/locked around each call to the user function - since the user 495 * function must be allowed to make ACPICA calls itself (for example, it 496 * will typically execute control methods during device enumeration.) 497 */ 498 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 499 if (ACPI_FAILURE(status)) { 500 goto unlock_and_exit; 501 } 502 503 status = acpi_ns_walk_namespace(type, start_object, max_depth, 504 ACPI_NS_WALK_UNLOCK, user_function, 505 context, return_value); 506 507 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 508 509 unlock_and_exit: 510 (void)acpi_ut_release_read_lock(&acpi_gbl_namespace_rw_lock); 511 return_ACPI_STATUS(status); 512} 513 514ACPI_EXPORT_SYMBOL(acpi_walk_namespace) 515 516/******************************************************************************* 517 * 518 * FUNCTION: acpi_ns_get_device_callback 519 * 520 * PARAMETERS: Callback from acpi_get_device 521 * 522 * RETURN: Status 523 * 524 * DESCRIPTION: Takes callbacks from walk_namespace and filters out all non- 525 * present devices, or if they specified a HID, it filters based 526 * on that. 527 * 528 ******************************************************************************/ 529static acpi_status 530acpi_ns_get_device_callback(acpi_handle obj_handle, 531 u32 nesting_level, 532 void *context, void **return_value) 533{ 534 struct acpi_get_devices_info *info = context; 535 acpi_status status; 536 struct acpi_namespace_node *node; 537 u32 flags; 538 struct acpica_device_id *hid; 539 struct acpica_device_id_list *cid; 540 u32 i; 541 u8 found; 542 int no_match; 543 544 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 545 if (ACPI_FAILURE(status)) { 546 return (status); 547 } 548 549 node = acpi_ns_map_handle_to_node(obj_handle); 550 status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 551 if (ACPI_FAILURE(status)) { 552 return (status); 553 } 554 555 if (!node) { 556 return (AE_BAD_PARAMETER); 557 } 558 559 /* Run _STA to determine if device is present */ 560 561 status = acpi_ut_execute_STA(node, &flags); 562 if (ACPI_FAILURE(status)) { 563 return (AE_CTRL_DEPTH); 564 } 565 566 if (!(flags & ACPI_STA_DEVICE_PRESENT) && 567 !(flags & ACPI_STA_DEVICE_FUNCTIONING)) { 568 /* 569 * Don't examine the children of the device only when the 570 * device is neither present nor functional. See ACPI spec, 571 * description of _STA for more information. 572 */ 573 return (AE_CTRL_DEPTH); 574 } 575 576 /* Filter based on device HID & CID */ 577 578 if (info->hid != NULL) { 579 status = acpi_ut_execute_HID(node, &hid); 580 if (status == AE_NOT_FOUND) { 581 return (AE_OK); 582 } else if (ACPI_FAILURE(status)) { 583 return (AE_CTRL_DEPTH); 584 } 585 586 no_match = ACPI_STRCMP(hid->string, info->hid); 587 ACPI_FREE(hid); 588 589 if (no_match) { 590 /* 591 * HID does not match, attempt match within the 592 * list of Compatible IDs (CIDs) 593 */ 594 status = acpi_ut_execute_CID(node, &cid); 595 if (status == AE_NOT_FOUND) { 596 return (AE_OK); 597 } else if (ACPI_FAILURE(status)) { 598 return (AE_CTRL_DEPTH); 599 } 600 601 /* Walk the CID list */ 602 603 found = 0; 604 for (i = 0; i < cid->count; i++) { 605 if (ACPI_STRCMP(cid->ids[i].string, info->hid) 606 == 0) { 607 found = 1; 608 break; 609 } 610 } 611 ACPI_FREE(cid); 612 if (!found) 613 return (AE_OK); 614 } 615 } 616 617 status = info->user_function(obj_handle, nesting_level, info->context, 618 return_value); 619 return (status); 620} 621 622/******************************************************************************* 623 * 624 * FUNCTION: acpi_get_devices 625 * 626 * PARAMETERS: HID - HID to search for. Can be NULL. 627 * user_function - Called when a matching object is found 628 * Context - Passed to user function 629 * return_value - Location where return value of 630 * user_function is put if terminated early 631 * 632 * RETURNS Return value from the user_function if terminated early. 633 * Otherwise, returns NULL. 634 * 635 * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, 636 * starting (and ending) at the object specified by start_handle. 637 * The user_function is called whenever an object of type 638 * Device is found. If the user function returns 639 * a non-zero value, the search is terminated immediately and this 640 * value is returned to the caller. 641 * 642 * This is a wrapper for walk_namespace, but the callback performs 643 * additional filtering. Please see acpi_ns_get_device_callback. 644 * 645 ******************************************************************************/ 646 647acpi_status 648acpi_get_devices(const char *HID, 649 acpi_walk_callback user_function, 650 void *context, void **return_value) 651{ 652 acpi_status status; 653 struct acpi_get_devices_info info; 654 655 ACPI_FUNCTION_TRACE(acpi_get_devices); 656 657 /* Parameter validation */ 658 659 if (!user_function) { 660 return_ACPI_STATUS(AE_BAD_PARAMETER); 661 } 662 663 /* 664 * We're going to call their callback from OUR callback, so we need 665 * to know what it is, and their context parameter. 666 */ 667 info.hid = HID; 668 info.context = context; 669 info.user_function = user_function; 670 671 /* 672 * Lock the namespace around the walk. 673 * The namespace will be unlocked/locked around each call 674 * to the user function - since this function 675 * must be allowed to make Acpi calls itself. 676 */ 677 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 678 if (ACPI_FAILURE(status)) { 679 return_ACPI_STATUS(status); 680 } 681 682 status = acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 683 ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK, 684 acpi_ns_get_device_callback, &info, 685 return_value); 686 687 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 688 return_ACPI_STATUS(status); 689} 690 691ACPI_EXPORT_SYMBOL(acpi_get_devices) 692 693/******************************************************************************* 694 * 695 * FUNCTION: acpi_attach_data 696 * 697 * PARAMETERS: obj_handle - Namespace node 698 * Handler - Handler for this attachment 699 * Data - Pointer to data to be attached 700 * 701 * RETURN: Status 702 * 703 * DESCRIPTION: Attach arbitrary data and handler to a namespace node. 704 * 705 ******************************************************************************/ 706acpi_status 707acpi_attach_data(acpi_handle obj_handle, 708 acpi_object_handler handler, void *data) 709{ 710 struct acpi_namespace_node *node; 711 acpi_status status; 712 713 /* Parameter validation */ 714 715 if (!obj_handle || !handler || !data) { 716 return (AE_BAD_PARAMETER); 717 } 718 719 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 720 if (ACPI_FAILURE(status)) { 721 return (status); 722 } 723 724 /* Convert and validate the handle */ 725 726 node = acpi_ns_map_handle_to_node(obj_handle); 727 if (!node) { 728 status = AE_BAD_PARAMETER; 729 goto unlock_and_exit; 730 } 731 732 status = acpi_ns_attach_data(node, handler, data); 733 734 unlock_and_exit: 735 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 736 return (status); 737} 738 739ACPI_EXPORT_SYMBOL(acpi_attach_data) 740 741/******************************************************************************* 742 * 743 * FUNCTION: acpi_detach_data 744 * 745 * PARAMETERS: obj_handle - Namespace node handle 746 * Handler - Handler used in call to acpi_attach_data 747 * 748 * RETURN: Status 749 * 750 * DESCRIPTION: Remove data that was previously attached to a node. 751 * 752 ******************************************************************************/ 753acpi_status 754acpi_detach_data(acpi_handle obj_handle, acpi_object_handler handler) 755{ 756 struct acpi_namespace_node *node; 757 acpi_status status; 758 759 /* Parameter validation */ 760 761 if (!obj_handle || !handler) { 762 return (AE_BAD_PARAMETER); 763 } 764 765 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 766 if (ACPI_FAILURE(status)) { 767 return (status); 768 } 769 770 /* Convert and validate the handle */ 771 772 node = acpi_ns_map_handle_to_node(obj_handle); 773 if (!node) { 774 status = AE_BAD_PARAMETER; 775 goto unlock_and_exit; 776 } 777 778 status = acpi_ns_detach_data(node, handler); 779 780 unlock_and_exit: 781 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 782 return (status); 783} 784 785ACPI_EXPORT_SYMBOL(acpi_detach_data) 786 787/******************************************************************************* 788 * 789 * FUNCTION: acpi_get_data 790 * 791 * PARAMETERS: obj_handle - Namespace node 792 * Handler - Handler used in call to attach_data 793 * Data - Where the data is returned 794 * 795 * RETURN: Status 796 * 797 * DESCRIPTION: Retrieve data that was previously attached to a namespace node. 798 * 799 ******************************************************************************/ 800acpi_status 801acpi_get_data(acpi_handle obj_handle, acpi_object_handler handler, void **data) 802{ 803 struct acpi_namespace_node *node; 804 acpi_status status; 805 806 /* Parameter validation */ 807 808 if (!obj_handle || !handler || !data) { 809 return (AE_BAD_PARAMETER); 810 } 811 812 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 813 if (ACPI_FAILURE(status)) { 814 return (status); 815 } 816 817 /* Convert and validate the handle */ 818 819 node = acpi_ns_map_handle_to_node(obj_handle); 820 if (!node) { 821 status = AE_BAD_PARAMETER; 822 goto unlock_and_exit; 823 } 824 825 status = acpi_ns_get_attached_data(node, handler, data); 826 827 unlock_and_exit: 828 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 829 return (status); 830} 831 832ACPI_EXPORT_SYMBOL(acpi_get_data) 833