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