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 - 2012, 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 <linux/export.h> 46 #include <acpi/acpi.h> 47 #include "accommon.h" 48 #include "acnamesp.h" 49 #include "acinterp.h" 50 51 #define _COMPONENT ACPI_NAMESPACE 52 ACPI_MODULE_NAME("nsxfeval") 53 54 /* Local prototypes */ 55 static void acpi_ns_resolve_references(struct acpi_evaluate_info *info); 56 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) 150 151 /******************************************************************************* 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_validate_handle(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 ((info->return_object)->common.type != ACPI_TYPE_LOCAL_REFERENCE) { 391 return; 392 } 393 394 /* 395 * Two types of references are supported - those created by Index and 396 * ref_of operators. A name reference (AML_NAMEPATH_OP) can be converted 397 * to an union acpi_object, so it is not dereferenced here. A ddb_handle 398 * (AML_LOAD_OP) cannot be dereferenced, nor can it be converted to 399 * an union acpi_object. 400 */ 401 switch (info->return_object->reference.class) { 402 case ACPI_REFCLASS_INDEX: 403 404 obj_desc = *(info->return_object->reference.where); 405 break; 406 407 case ACPI_REFCLASS_REFOF: 408 409 node = info->return_object->reference.object; 410 if (node) { 411 obj_desc = node->object; 412 } 413 break; 414 415 default: 416 return; 417 } 418 419 /* Replace the existing reference object */ 420 421 if (obj_desc) { 422 acpi_ut_add_reference(obj_desc); 423 acpi_ut_remove_reference(info->return_object); 424 info->return_object = obj_desc; 425 } 426 427 return; 428 } 429 430 /******************************************************************************* 431 * 432 * FUNCTION: acpi_walk_namespace 433 * 434 * PARAMETERS: type - acpi_object_type to search for 435 * start_object - Handle in namespace where search begins 436 * max_depth - Depth to which search is to reach 437 * pre_order_visit - Called during tree pre-order visit 438 * when an object of "Type" is found 439 * post_order_visit - Called during tree post-order visit 440 * when an object of "Type" is found 441 * context - Passed to user function(s) above 442 * return_value - Location where return value of 443 * user_function is put if terminated early 444 * 445 * RETURNS Return value from the user_function if terminated early. 446 * Otherwise, returns NULL. 447 * 448 * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, 449 * starting (and ending) at the object specified by start_handle. 450 * The callback function is called whenever an object that matches 451 * the type parameter is found. If the callback function returns 452 * a non-zero value, the search is terminated immediately and this 453 * value is returned to the caller. 454 * 455 * The point of this procedure is to provide a generic namespace 456 * walk routine that can be called from multiple places to 457 * provide multiple services; the callback function(s) can be 458 * tailored to each task, whether it is a print function, 459 * a compare function, etc. 460 * 461 ******************************************************************************/ 462 463 acpi_status 464 acpi_walk_namespace(acpi_object_type type, 465 acpi_handle start_object, 466 u32 max_depth, 467 acpi_walk_callback pre_order_visit, 468 acpi_walk_callback post_order_visit, 469 void *context, void **return_value) 470 { 471 acpi_status status; 472 473 ACPI_FUNCTION_TRACE(acpi_walk_namespace); 474 475 /* Parameter validation */ 476 477 if ((type > ACPI_TYPE_LOCAL_MAX) || 478 (!max_depth) || (!pre_order_visit && !post_order_visit)) { 479 return_ACPI_STATUS(AE_BAD_PARAMETER); 480 } 481 482 /* 483 * Need to acquire the namespace reader lock to prevent interference 484 * with any concurrent table unloads (which causes the deletion of 485 * namespace objects). We cannot allow the deletion of a namespace node 486 * while the user function is using it. The exception to this are the 487 * nodes created and deleted during control method execution -- these 488 * nodes are marked as temporary nodes and are ignored by the namespace 489 * walk. Thus, control methods can be executed while holding the 490 * namespace deletion lock (and the user function can execute control 491 * methods.) 492 */ 493 status = acpi_ut_acquire_read_lock(&acpi_gbl_namespace_rw_lock); 494 if (ACPI_FAILURE(status)) { 495 return status; 496 } 497 498 /* 499 * Lock the namespace around the walk. The namespace will be 500 * unlocked/locked around each call to the user function - since the user 501 * function must be allowed to make ACPICA calls itself (for example, it 502 * will typically execute control methods during device enumeration.) 503 */ 504 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 505 if (ACPI_FAILURE(status)) { 506 goto unlock_and_exit; 507 } 508 509 status = acpi_ns_walk_namespace(type, start_object, max_depth, 510 ACPI_NS_WALK_UNLOCK, pre_order_visit, 511 post_order_visit, context, 512 return_value); 513 514 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 515 516 unlock_and_exit: 517 (void)acpi_ut_release_read_lock(&acpi_gbl_namespace_rw_lock); 518 return_ACPI_STATUS(status); 519 } 520 521 ACPI_EXPORT_SYMBOL(acpi_walk_namespace) 522 523 /******************************************************************************* 524 * 525 * FUNCTION: acpi_ns_get_device_callback 526 * 527 * PARAMETERS: Callback from acpi_get_device 528 * 529 * RETURN: Status 530 * 531 * DESCRIPTION: Takes callbacks from walk_namespace and filters out all non- 532 * present devices, or if they specified a HID, it filters based 533 * on that. 534 * 535 ******************************************************************************/ 536 static acpi_status 537 acpi_ns_get_device_callback(acpi_handle obj_handle, 538 u32 nesting_level, 539 void *context, void **return_value) 540 { 541 struct acpi_get_devices_info *info = context; 542 acpi_status status; 543 struct acpi_namespace_node *node; 544 u32 flags; 545 struct acpi_pnp_device_id *hid; 546 struct acpi_pnp_device_id_list *cid; 547 u32 i; 548 u8 found; 549 int no_match; 550 551 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 552 if (ACPI_FAILURE(status)) { 553 return_ACPI_STATUS(status); 554 } 555 556 node = acpi_ns_validate_handle(obj_handle); 557 status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 558 if (ACPI_FAILURE(status)) { 559 return (status); 560 } 561 562 if (!node) { 563 return (AE_BAD_PARAMETER); 564 } 565 566 /* 567 * First, filter based on the device HID and CID. 568 * 569 * 01/2010: For this case where a specific HID is requested, we don't 570 * want to run _STA until we have an actual HID match. Thus, we will 571 * not unnecessarily execute _STA on devices for which the caller 572 * doesn't care about. Previously, _STA was executed unconditionally 573 * on all devices found here. 574 * 575 * A side-effect of this change is that now we will continue to search 576 * for a matching HID even under device trees where the parent device 577 * would have returned a _STA that indicates it is not present or 578 * not functioning (thus aborting the search on that branch). 579 */ 580 if (info->hid != NULL) { 581 status = acpi_ut_execute_HID(node, &hid); 582 if (status == AE_NOT_FOUND) { 583 return (AE_OK); 584 } else if (ACPI_FAILURE(status)) { 585 return (AE_CTRL_DEPTH); 586 } 587 588 no_match = ACPI_STRCMP(hid->string, info->hid); 589 ACPI_FREE(hid); 590 591 if (no_match) { 592 /* 593 * HID does not match, attempt match within the 594 * list of Compatible IDs (CIDs) 595 */ 596 status = acpi_ut_execute_CID(node, &cid); 597 if (status == AE_NOT_FOUND) { 598 return (AE_OK); 599 } else if (ACPI_FAILURE(status)) { 600 return (AE_CTRL_DEPTH); 601 } 602 603 /* Walk the CID list */ 604 605 found = 0; 606 for (i = 0; i < cid->count; i++) { 607 if (ACPI_STRCMP(cid->ids[i].string, info->hid) 608 == 0) { 609 found = 1; 610 break; 611 } 612 } 613 ACPI_FREE(cid); 614 if (!found) 615 return (AE_OK); 616 } 617 } 618 619 /* Run _STA to determine if device is present */ 620 621 status = acpi_ut_execute_STA(node, &flags); 622 if (ACPI_FAILURE(status)) { 623 return (AE_CTRL_DEPTH); 624 } 625 626 if (!(flags & ACPI_STA_DEVICE_PRESENT) && 627 !(flags & ACPI_STA_DEVICE_FUNCTIONING)) { 628 /* 629 * Don't examine the children of the device only when the 630 * device is neither present nor functional. See ACPI spec, 631 * description of _STA for more information. 632 */ 633 return (AE_CTRL_DEPTH); 634 } 635 636 /* We have a valid device, invoke the user function */ 637 638 status = info->user_function(obj_handle, nesting_level, info->context, 639 return_value); 640 return (status); 641 } 642 643 /******************************************************************************* 644 * 645 * FUNCTION: acpi_get_devices 646 * 647 * PARAMETERS: HID - HID to search for. Can be NULL. 648 * user_function - Called when a matching object is found 649 * context - Passed to user function 650 * return_value - Location where return value of 651 * user_function is put if terminated early 652 * 653 * RETURNS Return value from the user_function if terminated early. 654 * Otherwise, returns NULL. 655 * 656 * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, 657 * starting (and ending) at the object specified by start_handle. 658 * The user_function is called whenever an object of type 659 * Device is found. If the user function returns 660 * a non-zero value, the search is terminated immediately and this 661 * value is returned to the caller. 662 * 663 * This is a wrapper for walk_namespace, but the callback performs 664 * additional filtering. Please see acpi_ns_get_device_callback. 665 * 666 ******************************************************************************/ 667 668 acpi_status 669 acpi_get_devices(const char *HID, 670 acpi_walk_callback user_function, 671 void *context, void **return_value) 672 { 673 acpi_status status; 674 struct acpi_get_devices_info info; 675 676 ACPI_FUNCTION_TRACE(acpi_get_devices); 677 678 /* Parameter validation */ 679 680 if (!user_function) { 681 return_ACPI_STATUS(AE_BAD_PARAMETER); 682 } 683 684 /* 685 * We're going to call their callback from OUR callback, so we need 686 * to know what it is, and their context parameter. 687 */ 688 info.hid = HID; 689 info.context = context; 690 info.user_function = user_function; 691 692 /* 693 * Lock the namespace around the walk. 694 * The namespace will be unlocked/locked around each call 695 * to the user function - since this function 696 * must be allowed to make Acpi calls itself. 697 */ 698 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 699 if (ACPI_FAILURE(status)) { 700 return_ACPI_STATUS(status); 701 } 702 703 status = acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 704 ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK, 705 acpi_ns_get_device_callback, NULL, 706 &info, return_value); 707 708 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 709 return_ACPI_STATUS(status); 710 } 711 712 ACPI_EXPORT_SYMBOL(acpi_get_devices) 713 714 /******************************************************************************* 715 * 716 * FUNCTION: acpi_attach_data 717 * 718 * PARAMETERS: obj_handle - Namespace node 719 * handler - Handler for this attachment 720 * data - Pointer to data to be attached 721 * 722 * RETURN: Status 723 * 724 * DESCRIPTION: Attach arbitrary data and handler to a namespace node. 725 * 726 ******************************************************************************/ 727 acpi_status 728 acpi_attach_data(acpi_handle obj_handle, 729 acpi_object_handler handler, void *data) 730 { 731 struct acpi_namespace_node *node; 732 acpi_status status; 733 734 /* Parameter validation */ 735 736 if (!obj_handle || !handler || !data) { 737 return (AE_BAD_PARAMETER); 738 } 739 740 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 741 if (ACPI_FAILURE(status)) { 742 return (status); 743 } 744 745 /* Convert and validate the handle */ 746 747 node = acpi_ns_validate_handle(obj_handle); 748 if (!node) { 749 status = AE_BAD_PARAMETER; 750 goto unlock_and_exit; 751 } 752 753 status = acpi_ns_attach_data(node, handler, data); 754 755 unlock_and_exit: 756 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 757 return (status); 758 } 759 760 ACPI_EXPORT_SYMBOL(acpi_attach_data) 761 762 /******************************************************************************* 763 * 764 * FUNCTION: acpi_detach_data 765 * 766 * PARAMETERS: obj_handle - Namespace node handle 767 * handler - Handler used in call to acpi_attach_data 768 * 769 * RETURN: Status 770 * 771 * DESCRIPTION: Remove data that was previously attached to a node. 772 * 773 ******************************************************************************/ 774 acpi_status 775 acpi_detach_data(acpi_handle obj_handle, acpi_object_handler handler) 776 { 777 struct acpi_namespace_node *node; 778 acpi_status status; 779 780 /* Parameter validation */ 781 782 if (!obj_handle || !handler) { 783 return (AE_BAD_PARAMETER); 784 } 785 786 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 787 if (ACPI_FAILURE(status)) { 788 return (status); 789 } 790 791 /* Convert and validate the handle */ 792 793 node = acpi_ns_validate_handle(obj_handle); 794 if (!node) { 795 status = AE_BAD_PARAMETER; 796 goto unlock_and_exit; 797 } 798 799 status = acpi_ns_detach_data(node, handler); 800 801 unlock_and_exit: 802 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 803 return (status); 804 } 805 806 ACPI_EXPORT_SYMBOL(acpi_detach_data) 807 808 /******************************************************************************* 809 * 810 * FUNCTION: acpi_get_data 811 * 812 * PARAMETERS: obj_handle - Namespace node 813 * handler - Handler used in call to attach_data 814 * data - Where the data is returned 815 * 816 * RETURN: Status 817 * 818 * DESCRIPTION: Retrieve data that was previously attached to a namespace node. 819 * 820 ******************************************************************************/ 821 acpi_status 822 acpi_get_data(acpi_handle obj_handle, acpi_object_handler handler, void **data) 823 { 824 struct acpi_namespace_node *node; 825 acpi_status status; 826 827 /* Parameter validation */ 828 829 if (!obj_handle || !handler || !data) { 830 return (AE_BAD_PARAMETER); 831 } 832 833 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 834 if (ACPI_FAILURE(status)) { 835 return (status); 836 } 837 838 /* Convert and validate the handle */ 839 840 node = acpi_ns_validate_handle(obj_handle); 841 if (!node) { 842 status = AE_BAD_PARAMETER; 843 goto unlock_and_exit; 844 } 845 846 status = acpi_ns_get_attached_data(node, handler, data); 847 848 unlock_and_exit: 849 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 850 return (status); 851 } 852 853 ACPI_EXPORT_SYMBOL(acpi_get_data) 854