git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/utilities/uteval.c

   1 /******************************************************************************
   2  *
   3  * Module Name: uteval - Object evaluation
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2007, R. Byron Moore
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include <acpi/acnamesp.h>
  46 #include <acpi/acinterp.h>
  47
  48 #define _COMPONENT          ACPI_UTILITIES
  49 ACPI_MODULE_NAME("uteval")
  50
  51 /* Local prototypes */
  52 static void
  53 acpi_ut_copy_id_string(char *destination, char *source, acpi_size max_length);
  54
  55 static acpi_status
  56 acpi_ut_translate_one_cid(union acpi_operand_object *obj_desc,
  57                           struct acpi_compatible_id *one_cid);
  58
  59 /*
  60  * Strings supported by the _OSI predefined (internal) method.
  61  */
  62 static char *acpi_interfaces_supported[] = {
  63         /* Operating System Vendor Strings */
  64
  65         "Windows 2000",         /* Windows 2000 */
  66         "Windows 2001",         /* Windows XP */
  67         "Windows 2001 SP1",     /* Windows XP SP1 */
  68         "Windows 2001 SP2",     /* Windows XP SP2 */
  69         "Windows 2001.1",       /* Windows Server 2003 */
  70         "Windows 2001.1 SP1",   /* Windows Server 2003 SP1 - Added 03/2006 */
  71         "Windows 2006",         /* Windows Vista - Added 03/2006 */
  72
  73         /* Feature Group Strings */
  74
  75         "Extended Address Space Descriptor"
  76             /*
  77              * All "optional" feature group strings (features that are implemented
  78              * by the host) should be implemented in the host version of
  79              * acpi_os_validate_interface and should not be added here.
  80              */
  81 };
  82
  83 /*******************************************************************************
  84  *
  85  * FUNCTION:    acpi_ut_osi_implementation
  86  *
  87  * PARAMETERS:  walk_state          - Current walk state
  88  *
  89  * RETURN:      Status
  90  *
  91  * DESCRIPTION: Implementation of the _OSI predefined control method
  92  *
  93  ******************************************************************************/
  94
  95 acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state)
  96 {
  97         acpi_status status;
  98         union acpi_operand_object *string_desc;
  99         union acpi_operand_object *return_desc;
 100         acpi_native_uint i;
 101
 102         ACPI_FUNCTION_TRACE(ut_osi_implementation);
 103
 104         /* Validate the string input argument */
 105
 106         string_desc = walk_state->arguments[0].object;
 107         if (!string_desc || (string_desc->common.type != ACPI_TYPE_STRING)) {
 108                 return_ACPI_STATUS(AE_TYPE);
 109         }
 110
 111         /* Create a return object */
 112
 113         return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 114         if (!return_desc) {
 115                 return_ACPI_STATUS(AE_NO_MEMORY);
 116         }
 117
 118         /* Default return value is SUPPORTED */
 119
 120         return_desc->integer.value = ACPI_UINT32_MAX;
 121         walk_state->return_desc = return_desc;
 122
 123         /* Compare input string to static table of supported interfaces */
 124
 125         for (i = 0; i < ACPI_ARRAY_LENGTH(acpi_interfaces_supported); i++) {
 126                 if (!ACPI_STRCMP
 127                     (string_desc->string.pointer,
 128                      acpi_interfaces_supported[i])) {
 129
 130                         /* The interface is supported */
 131
 132                         return_ACPI_STATUS(AE_CTRL_TERMINATE);
 133                 }
 134         }
 135
 136         /*
 137          * Did not match the string in the static table, call the host OSL to
 138          * check for a match with one of the optional strings (such as
 139          * "Module Device", "3.0 Thermal Model", etc.)
 140          */
 141         status = acpi_os_validate_interface(string_desc->string.pointer);
 142         if (ACPI_SUCCESS(status)) {
 143
 144                 /* The interface is supported */
 145
 146                 return_ACPI_STATUS(AE_CTRL_TERMINATE);
 147         }
 148
 149         /* The interface is not supported */
 150
 151         return_desc->integer.value = 0;
 152         return_ACPI_STATUS(AE_CTRL_TERMINATE);
 153 }
 154
 155 /*******************************************************************************
 156  *
 157  * FUNCTION:    acpi_osi_invalidate
 158  *
 159  * PARAMETERS:  interface_string
 160  *
 161  * RETURN:      Status
 162  *
 163  * DESCRIPTION: invalidate string in pre-defiend _OSI string list
 164  *
 165  ******************************************************************************/
 166
 167 acpi_status acpi_osi_invalidate(char *interface)
 168 {
 169         int i;
 170
 171         for (i = 0; i < ACPI_ARRAY_LENGTH(acpi_interfaces_supported); i++) {
 172                 if (!ACPI_STRCMP(interface, acpi_interfaces_supported[i])) {
 173                         *acpi_interfaces_supported[i] = '\0';
 174                         return AE_OK;
 175                 }
 176         }
 177         return AE_NOT_FOUND;
 178 }
 179
 180 /*******************************************************************************
 181  *
 182  * FUNCTION:    acpi_ut_evaluate_object
 183  *
 184  * PARAMETERS:  prefix_node         - Starting node
 185  *              Path                - Path to object from starting node
 186  *              expected_return_types - Bitmap of allowed return types
 187  *              return_desc         - Where a return value is stored
 188  *
 189  * RETURN:      Status
 190  *
 191  * DESCRIPTION: Evaluates a namespace object and verifies the type of the
 192  *              return object.  Common code that simplifies accessing objects
 193  *              that have required return objects of fixed types.
 194  *
 195  *              NOTE: Internal function, no parameter validation
 196  *
 197  ******************************************************************************/
 198
 199 acpi_status
 200 acpi_ut_evaluate_object(struct acpi_namespace_node *prefix_node,
 201                         char *path,
 202                         u32 expected_return_btypes,
 203                         union acpi_operand_object **return_desc)
 204 {
 205         struct acpi_evaluate_info *info;
 206         acpi_status status;
 207         u32 return_btype;
 208
 209         ACPI_FUNCTION_TRACE(ut_evaluate_object);
 210
 211         /* Allocate the evaluation information block */
 212
 213         info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
 214         if (!info) {
 215                 return_ACPI_STATUS(AE_NO_MEMORY);
 216         }
 217
 218         info->prefix_node = prefix_node;
 219         info->pathname = path;
 220         info->parameter_type = ACPI_PARAM_ARGS;
 221
 222         /* Evaluate the object/method */
 223
 224         status = acpi_ns_evaluate(info);
 225         if (ACPI_FAILURE(status)) {
 226                 if (status == AE_NOT_FOUND) {
 227                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 228                                           "[%4.4s.%s] was not found\n",
 229                                           acpi_ut_get_node_name(prefix_node),
 230                                           path));
 231                 } else {
 232                         ACPI_ERROR_METHOD("Method execution failed",
 233                                           prefix_node, path, status);
 234                 }
 235
 236                 goto cleanup;
 237         }
 238
 239         /* Did we get a return object? */
 240
 241         if (!info->return_object) {
 242                 if (expected_return_btypes) {
 243                         ACPI_ERROR_METHOD("No object was returned from",
 244                                           prefix_node, path, AE_NOT_EXIST);
 245
 246                         status = AE_NOT_EXIST;
 247                 }
 248
 249                 goto cleanup;
 250         }
 251
 252         /* Map the return object type to the bitmapped type */
 253
 254         switch (ACPI_GET_OBJECT_TYPE(info->return_object)) {
 255         case ACPI_TYPE_INTEGER:
 256                 return_btype = ACPI_BTYPE_INTEGER;
 257                 break;
 258
 259         case ACPI_TYPE_BUFFER:
 260                 return_btype = ACPI_BTYPE_BUFFER;
 261                 break;
 262
 263         case ACPI_TYPE_STRING:
 264                 return_btype = ACPI_BTYPE_STRING;
 265                 break;
 266
 267         case ACPI_TYPE_PACKAGE:
 268                 return_btype = ACPI_BTYPE_PACKAGE;
 269                 break;
 270
 271         default:
 272                 return_btype = 0;
 273                 break;
 274         }
 275
 276         if ((acpi_gbl_enable_interpreter_slack) && (!expected_return_btypes)) {
 277                 /*
 278                  * We received a return object, but one was not expected.  This can
 279                  * happen frequently if the "implicit return" feature is enabled.
 280                  * Just delete the return object and return AE_OK.
 281                  */
 282                 acpi_ut_remove_reference(info->return_object);
 283                 goto cleanup;
 284         }
 285
 286         /* Is the return object one of the expected types? */
 287
 288         if (!(expected_return_btypes & return_btype)) {
 289                 ACPI_ERROR_METHOD("Return object type is incorrect",
 290                                   prefix_node, path, AE_TYPE);
 291
 292                 ACPI_ERROR((AE_INFO,
 293                             "Type returned from %s was incorrect: %s, expected Btypes: %X",
 294                             path,
 295                             acpi_ut_get_object_type_name(info->return_object),
 296                             expected_return_btypes));
 297
 298                 /* On error exit, we must delete the return object */
 299
 300                 acpi_ut_remove_reference(info->return_object);
 301                 status = AE_TYPE;
 302                 goto cleanup;
 303         }
 304
 305         /* Object type is OK, return it */
 306
 307         *return_desc = info->return_object;
 308
 309       cleanup:
 310         ACPI_FREE(info);
 311         return_ACPI_STATUS(status);
 312 }
 313
 314 /*******************************************************************************
 315  *
 316  * FUNCTION:    acpi_ut_evaluate_numeric_object
 317  *
 318  * PARAMETERS:  object_name         - Object name to be evaluated
 319  *              device_node         - Node for the device
 320  *              Address             - Where the value is returned
 321  *
 322  * RETURN:      Status
 323  *
 324  * DESCRIPTION: Evaluates a numeric namespace object for a selected device
 325  *              and stores result in *Address.
 326  *
 327  *              NOTE: Internal function, no parameter validation
 328  *
 329  ******************************************************************************/
 330
 331 acpi_status
 332 acpi_ut_evaluate_numeric_object(char *object_name,
 333                                 struct acpi_namespace_node *device_node,
 334                                 acpi_integer * address)
 335 {
 336         union acpi_operand_object *obj_desc;
 337         acpi_status status;
 338
 339         ACPI_FUNCTION_TRACE(ut_evaluate_numeric_object);
 340
 341         status = acpi_ut_evaluate_object(device_node, object_name,
 342                                          ACPI_BTYPE_INTEGER, &obj_desc);
 343         if (ACPI_FAILURE(status)) {
 344                 return_ACPI_STATUS(status);
 345         }
 346
 347         /* Get the returned Integer */
 348
 349         *address = obj_desc->integer.value;
 350
 351         /* On exit, we must delete the return object */
 352
 353         acpi_ut_remove_reference(obj_desc);
 354         return_ACPI_STATUS(status);
 355 }
 356
 357 /*******************************************************************************
 358  *
 359  * FUNCTION:    acpi_ut_copy_id_string
 360  *
 361  * PARAMETERS:  Destination         - Where to copy the string
 362  *              Source              - Source string
 363  *              max_length          - Length of the destination buffer
 364  *
 365  * RETURN:      None
 366  *
 367  * DESCRIPTION: Copies an ID string for the _HID, _CID, and _UID methods.
 368  *              Performs removal of a leading asterisk if present -- workaround
 369  *              for a known issue on a bunch of machines.
 370  *
 371  ******************************************************************************/
 372
 373 static void
 374 acpi_ut_copy_id_string(char *destination, char *source, acpi_size max_length)
 375 {
 376
 377         /*
 378          * Workaround for ID strings that have a leading asterisk. This construct
 379          * is not allowed by the ACPI specification  (ID strings must be
 380          * alphanumeric), but enough existing machines have this embedded in their
 381          * ID strings that the following code is useful.
 382          */
 383         if (*source == '*') {
 384                 source++;
 385         }
 386
 387         /* Do the actual copy */
 388
 389         ACPI_STRNCPY(destination, source, max_length);
 390 }
 391
 392 /*******************************************************************************
 393  *
 394  * FUNCTION:    acpi_ut_execute_HID
 395  *
 396  * PARAMETERS:  device_node         - Node for the device
 397  *              Hid                 - Where the HID is returned
 398  *
 399  * RETURN:      Status
 400  *
 401  * DESCRIPTION: Executes the _HID control method that returns the hardware
 402  *              ID of the device.
 403  *
 404  *              NOTE: Internal function, no parameter validation
 405  *
 406  ******************************************************************************/
 407
 408 acpi_status
 409 acpi_ut_execute_HID(struct acpi_namespace_node *device_node,
 410                     struct acpica_device_id *hid)
 411 {
 412         union acpi_operand_object *obj_desc;
 413         acpi_status status;
 414
 415         ACPI_FUNCTION_TRACE(ut_execute_HID);
 416
 417         status = acpi_ut_evaluate_object(device_node, METHOD_NAME__HID,
 418                                          ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING,
 419                                          &obj_desc);
 420         if (ACPI_FAILURE(status)) {
 421                 return_ACPI_STATUS(status);
 422         }
 423
 424         if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_INTEGER) {
 425
 426                 /* Convert the Numeric HID to string */
 427
 428                 acpi_ex_eisa_id_to_string((u32) obj_desc->integer.value,
 429                                           hid->value);
 430         } else {
 431                 /* Copy the String HID from the returned object */
 432
 433                 acpi_ut_copy_id_string(hid->value, obj_desc->string.pointer,
 434                                        sizeof(hid->value));
 435         }
 436
 437         /* On exit, we must delete the return object */
 438
 439         acpi_ut_remove_reference(obj_desc);
 440         return_ACPI_STATUS(status);
 441 }
 442
 443 /*******************************************************************************
 444  *
 445  * FUNCTION:    acpi_ut_translate_one_cid
 446  *
 447  * PARAMETERS:  obj_desc            - _CID object, must be integer or string
 448  *              one_cid             - Where the CID string is returned
 449  *
 450  * RETURN:      Status
 451  *
 452  * DESCRIPTION: Return a numeric or string _CID value as a string.
 453  *              (Compatible ID)
 454  *
 455  *              NOTE:  Assumes a maximum _CID string length of
 456  *                     ACPI_MAX_CID_LENGTH.
 457  *
 458  ******************************************************************************/
 459
 460 static acpi_status
 461 acpi_ut_translate_one_cid(union acpi_operand_object *obj_desc,
 462                           struct acpi_compatible_id *one_cid)
 463 {
 464
 465         switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
 466         case ACPI_TYPE_INTEGER:
 467
 468                 /* Convert the Numeric CID to string */
 469
 470                 acpi_ex_eisa_id_to_string((u32) obj_desc->integer.value,
 471                                           one_cid->value);
 472                 return (AE_OK);
 473
 474         case ACPI_TYPE_STRING:
 475
 476                 if (obj_desc->string.length > ACPI_MAX_CID_LENGTH) {
 477                         return (AE_AML_STRING_LIMIT);
 478                 }
 479
 480                 /* Copy the String CID from the returned object */
 481
 482                 acpi_ut_copy_id_string(one_cid->value, obj_desc->string.pointer,
 483                                        ACPI_MAX_CID_LENGTH);
 484                 return (AE_OK);
 485
 486         default:
 487
 488                 return (AE_TYPE);
 489         }
 490 }
 491
 492 /*******************************************************************************
 493  *
 494  * FUNCTION:    acpi_ut_execute_CID
 495  *
 496  * PARAMETERS:  device_node         - Node for the device
 497  *              return_cid_list     - Where the CID list is returned
 498  *
 499  * RETURN:      Status
 500  *
 501  * DESCRIPTION: Executes the _CID control method that returns one or more
 502  *              compatible hardware IDs for the device.
 503  *
 504  *              NOTE: Internal function, no parameter validation
 505  *
 506  ******************************************************************************/
 507
 508 acpi_status
 509 acpi_ut_execute_CID(struct acpi_namespace_node * device_node,
 510                     struct acpi_compatible_id_list ** return_cid_list)
 511 {
 512         union acpi_operand_object *obj_desc;
 513         acpi_status status;
 514         u32 count;
 515         u32 size;
 516         struct acpi_compatible_id_list *cid_list;
 517         acpi_native_uint i;
 518
 519         ACPI_FUNCTION_TRACE(ut_execute_CID);
 520
 521         /* Evaluate the _CID method for this device */
 522
 523         status = acpi_ut_evaluate_object(device_node, METHOD_NAME__CID,
 524                                          ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING
 525                                          | ACPI_BTYPE_PACKAGE, &obj_desc);
 526         if (ACPI_FAILURE(status)) {
 527                 return_ACPI_STATUS(status);
 528         }
 529
 530         /* Get the number of _CIDs returned */
 531
 532         count = 1;
 533         if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_PACKAGE) {
 534                 count = obj_desc->package.count;
 535         }
 536
 537         /* Allocate a worst-case buffer for the _CIDs */
 538
 539         size = (((count - 1) * sizeof(struct acpi_compatible_id)) +
 540                 sizeof(struct acpi_compatible_id_list));
 541
 542         cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
 543         if (!cid_list) {
 544                 return_ACPI_STATUS(AE_NO_MEMORY);
 545         }
 546
 547         /* Init CID list */
 548
 549         cid_list->count = count;
 550         cid_list->size = size;
 551
 552         /*
 553          *  A _CID can return either a single compatible ID or a package of
 554          *  compatible IDs.  Each compatible ID can be one of the following:
 555          *  1) Integer (32 bit compressed EISA ID) or
 556          *  2) String (PCI ID format, e.g. "PCI\VEN_vvvv&DEV_dddd&SUBSYS_ssssssss")
 557          */
 558
 559         /* The _CID object can be either a single CID or a package (list) of CIDs */
 560
 561         if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_PACKAGE) {
 562
 563                 /* Translate each package element */
 564
 565                 for (i = 0; i < count; i++) {
 566                         status =
 567                             acpi_ut_translate_one_cid(obj_desc->package.
 568                                                       elements[i],
 569                                                       &cid_list->id[i]);
 570                         if (ACPI_FAILURE(status)) {
 571                                 break;
 572                         }
 573                 }
 574         } else {
 575                 /* Only one CID, translate to a string */
 576
 577                 status = acpi_ut_translate_one_cid(obj_desc, cid_list->id);
 578         }
 579
 580         /* Cleanup on error */
 581
 582         if (ACPI_FAILURE(status)) {
 583                 ACPI_FREE(cid_list);
 584         } else {
 585                 *return_cid_list = cid_list;
 586         }
 587
 588         /* On exit, we must delete the _CID return object */
 589
 590         acpi_ut_remove_reference(obj_desc);
 591         return_ACPI_STATUS(status);
 592 }
 593
 594 /*******************************************************************************
 595  *
 596  * FUNCTION:    acpi_ut_execute_UID
 597  *
 598  * PARAMETERS:  device_node         - Node for the device
 599  *              Uid                 - Where the UID is returned
 600  *
 601  * RETURN:      Status
 602  *
 603  * DESCRIPTION: Executes the _UID control method that returns the hardware
 604  *              ID of the device.
 605  *
 606  *              NOTE: Internal function, no parameter validation
 607  *
 608  ******************************************************************************/
 609
 610 acpi_status
 611 acpi_ut_execute_UID(struct acpi_namespace_node *device_node,
 612                     struct acpica_device_id *uid)
 613 {
 614         union acpi_operand_object *obj_desc;
 615         acpi_status status;
 616
 617         ACPI_FUNCTION_TRACE(ut_execute_UID);
 618
 619         status = acpi_ut_evaluate_object(device_node, METHOD_NAME__UID,
 620                                          ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING,
 621                                          &obj_desc);
 622         if (ACPI_FAILURE(status)) {
 623                 return_ACPI_STATUS(status);
 624         }
 625
 626         if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_INTEGER) {
 627
 628                 /* Convert the Numeric UID to string */
 629
 630                 acpi_ex_unsigned_integer_to_string(obj_desc->integer.value,
 631                                                    uid->value);
 632         } else {
 633                 /* Copy the String UID from the returned object */
 634
 635                 acpi_ut_copy_id_string(uid->value, obj_desc->string.pointer,
 636                                        sizeof(uid->value));
 637         }
 638
 639         /* On exit, we must delete the return object */
 640
 641         acpi_ut_remove_reference(obj_desc);
 642         return_ACPI_STATUS(status);
 643 }
 644
 645 /*******************************************************************************
 646  *
 647  * FUNCTION:    acpi_ut_execute_STA
 648  *
 649  * PARAMETERS:  device_node         - Node for the device
 650  *              Flags               - Where the status flags are returned
 651  *
 652  * RETURN:      Status
 653  *
 654  * DESCRIPTION: Executes _STA for selected device and stores results in
 655  *              *Flags.
 656  *
 657  *              NOTE: Internal function, no parameter validation
 658  *
 659  ******************************************************************************/
 660
 661 acpi_status
 662 acpi_ut_execute_STA(struct acpi_namespace_node *device_node, u32 * flags)
 663 {
 664         union acpi_operand_object *obj_desc;
 665         acpi_status status;
 666
 667         ACPI_FUNCTION_TRACE(ut_execute_STA);
 668
 669         status = acpi_ut_evaluate_object(device_node, METHOD_NAME__STA,
 670                                          ACPI_BTYPE_INTEGER, &obj_desc);
 671         if (ACPI_FAILURE(status)) {
 672                 if (AE_NOT_FOUND == status) {
 673                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 674                                           "_STA on %4.4s was not found, assuming device is present\n",
 675                                           acpi_ut_get_node_name(device_node)));
 676
 677                         *flags = ACPI_UINT32_MAX;
 678                         status = AE_OK;
 679                 }
 680
 681                 return_ACPI_STATUS(status);
 682         }
 683
 684         /* Extract the status flags */
 685
 686         *flags = (u32) obj_desc->integer.value;
 687
 688         /* On exit, we must delete the return object */
 689
 690         acpi_ut_remove_reference(obj_desc);
 691         return_ACPI_STATUS(status);
 692 }
 693
 694 /*******************************************************************************
 695  *
 696  * FUNCTION:    acpi_ut_execute_Sxds
 697  *
 698  * PARAMETERS:  device_node         - Node for the device
 699  *              Flags               - Where the status flags are returned
 700  *
 701  * RETURN:      Status
 702  *
 703  * DESCRIPTION: Executes _STA for selected device and stores results in
 704  *              *Flags.
 705  *
 706  *              NOTE: Internal function, no parameter validation
 707  *
 708  ******************************************************************************/
 709
 710 acpi_status
 711 acpi_ut_execute_sxds(struct acpi_namespace_node *device_node, u8 * highest)
 712 {
 713         union acpi_operand_object *obj_desc;
 714         acpi_status status;
 715         u32 i;
 716
 717         ACPI_FUNCTION_TRACE(ut_execute_sxds);
 718
 719         for (i = 0; i < 4; i++) {
 720                 highest[i] = 0xFF;
 721                 status = acpi_ut_evaluate_object(device_node,
 722                                                  ACPI_CAST_PTR(char,
 723                                                                acpi_gbl_highest_dstate_names
 724                                                                [i]),
 725                                                  ACPI_BTYPE_INTEGER, &obj_desc);
 726                 if (ACPI_FAILURE(status)) {
 727                         if (status != AE_NOT_FOUND) {
 728                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 729                                                   "%s on Device %4.4s, %s\n",
 730                                                   ACPI_CAST_PTR(char,
 731                                                                 acpi_gbl_highest_dstate_names
 732                                                                 [i]),
 733                                                   acpi_ut_get_node_name
 734                                                   (device_node),
 735                                                   acpi_format_exception
 736                                                   (status)));
 737
 738                                 return_ACPI_STATUS(status);
 739                         }
 740                 } else {
 741                         /* Extract the Dstate value */
 742
 743                         highest[i] = (u8) obj_desc->integer.value;
 744
 745                         /* Delete the return object */
 746
 747                         acpi_ut_remove_reference(obj_desc);
 748                 }
 749         }
 750
 751         return_ACPI_STATUS(AE_OK);
 752 }