drivers/acpi/acpica/uteval.c

   1 /******************************************************************************
   2  *
   3  * Module Name: uteval - Object evaluation
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2008, Intel Corp.
   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 "accommon.h"
  46 #include "acnamesp.h"
  47 #include "acinterp.h"
  48
  49 #define _COMPONENT          ACPI_UTILITIES
  50 ACPI_MODULE_NAME("uteval")
  51
  52 /* Local prototypes */
  53 static void
  54 acpi_ut_copy_id_string(char *destination, char *source, acpi_size max_length);
  55
  56 static acpi_status
  57 acpi_ut_translate_one_cid(union acpi_operand_object *obj_desc,
  58                           struct acpi_compatible_id *one_cid);
  59
  60 /*
  61  * Strings supported by the _OSI predefined (internal) method.
  62  *
  63  * March 2009: Removed "Linux" as this host no longer wants to respond true
  64  * for this string. Basically, the only safe OS strings are windows-related
  65  * and in many or most cases represent the only test path within the
  66  * BIOS-provided ASL code.
  67  *
  68  * The second element of each entry is used to track the newest version of
  69  * Windows that the BIOS has requested.
  70  */
  71 static struct acpi_interface_info acpi_interfaces_supported[] = {
  72         /* Operating System Vendor Strings */
  73
  74         {"Windows 2000", ACPI_OSI_WIN_2000},    /* Windows 2000 */
  75         {"Windows 2001", ACPI_OSI_WIN_XP},      /* Windows XP */
  76         {"Windows 2001 SP1", ACPI_OSI_WIN_XP_SP1},      /* Windows XP SP1 */
  77         {"Windows 2001.1", ACPI_OSI_WINSRV_2003},       /* Windows Server 2003 */
  78         {"Windows 2001 SP2", ACPI_OSI_WIN_XP_SP2},      /* Windows XP SP2 */
  79         {"Windows 2001.1 SP1", ACPI_OSI_WINSRV_2003_SP1},       /* Windows Server 2003 SP1 - Added 03/2006 */
  80         {"Windows 2006", ACPI_OSI_WIN_VISTA},   /* Windows Vista - Added 03/2006 */
  81
  82         /* Feature Group Strings */
  83
  84         {"Extended Address Space Descriptor", 0}
  85
  86         /*
  87          * All "optional" feature group strings (features that are implemented
  88          * by the host) should be implemented in the host version of
  89          * acpi_os_validate_interface and should not be added here.
  90          */
  91 };
  92
  93 /*******************************************************************************
  94  *
  95  * FUNCTION:    acpi_ut_osi_implementation
  96  *
  97  * PARAMETERS:  walk_state          - Current walk state
  98  *
  99  * RETURN:      Status
 100  *
 101  * DESCRIPTION: Implementation of the _OSI predefined control method
 102  *
 103  ******************************************************************************/
 104
 105 acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state)
 106 {
 107         acpi_status status;
 108         union acpi_operand_object *string_desc;
 109         union acpi_operand_object *return_desc;
 110         u32 return_value;
 111         u32 i;
 112
 113         ACPI_FUNCTION_TRACE(ut_osi_implementation);
 114
 115         /* Validate the string input argument */
 116
 117         string_desc = walk_state->arguments[0].object;
 118         if (!string_desc || (string_desc->common.type != ACPI_TYPE_STRING)) {
 119                 return_ACPI_STATUS(AE_TYPE);
 120         }
 121
 122         /* Create a return object */
 123
 124         return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 125         if (!return_desc) {
 126                 return_ACPI_STATUS(AE_NO_MEMORY);
 127         }
 128
 129         /* Default return value is 0, NOT SUPPORTED */
 130
 131         return_value = 0;
 132
 133         /* Compare input string to static table of supported interfaces */
 134
 135         for (i = 0; i < ACPI_ARRAY_LENGTH(acpi_interfaces_supported); i++) {
 136                 if (!ACPI_STRCMP(string_desc->string.pointer,
 137                                  acpi_interfaces_supported[i].name)) {
 138                         /*
 139                          * The interface is supported.
 140                          * Update the osi_data if necessary. We keep track of the latest
 141                          * version of Windows that has been requested by the BIOS.
 142                          */
 143                         if (acpi_interfaces_supported[i].value >
 144                             acpi_gbl_osi_data) {
 145                                 acpi_gbl_osi_data =
 146                                     acpi_interfaces_supported[i].value;
 147                         }
 148
 149                         return_value = ACPI_UINT32_MAX;
 150                         goto exit;
 151                 }
 152         }
 153
 154         /*
 155          * Did not match the string in the static table, call the host OSL to
 156          * check for a match with one of the optional strings (such as
 157          * "Module Device", "3.0 Thermal Model", etc.)
 158          */
 159         status = acpi_os_validate_interface(string_desc->string.pointer);
 160         if (ACPI_SUCCESS(status)) {
 161
 162                 /* The interface is supported */
 163
 164                 return_value = ACPI_UINT32_MAX;
 165         }
 166
 167 exit:
 168         ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INFO,
 169                 "ACPI: BIOS _OSI(%s) is %ssupported\n",
 170                 string_desc->string.pointer, return_value == 0 ? "not " : ""));
 171
 172         /* Complete the return value */
 173
 174         return_desc->integer.value = return_value;
 175         walk_state->return_desc = return_desc;
 176         return_ACPI_STATUS (AE_OK);
 177 }
 178
 179 /*******************************************************************************
 180  *
 181  * FUNCTION:    acpi_osi_invalidate
 182  *
 183  * PARAMETERS:  interface_string
 184  *
 185  * RETURN:      Status
 186  *
 187  * DESCRIPTION: invalidate string in pre-defiend _OSI string list
 188  *
 189  ******************************************************************************/
 190
 191 acpi_status acpi_osi_invalidate(char *interface)
 192 {
 193         int i;
 194
 195         for (i = 0; i < ACPI_ARRAY_LENGTH(acpi_interfaces_supported); i++) {
 196                 if (!ACPI_STRCMP(interface, acpi_interfaces_supported[i].name)) {
 197                         *acpi_interfaces_supported[i].name = '\0';
 198                         return AE_OK;
 199                 }
 200         }
 201         return AE_NOT_FOUND;
 202 }
 203
 204 /*******************************************************************************
 205  *
 206  * FUNCTION:    acpi_ut_evaluate_object
 207  *
 208  * PARAMETERS:  prefix_node         - Starting node
 209  *              Path                - Path to object from starting node
 210  *              expected_return_types - Bitmap of allowed return types
 211  *              return_desc         - Where a return value is stored
 212  *
 213  * RETURN:      Status
 214  *
 215  * DESCRIPTION: Evaluates a namespace object and verifies the type of the
 216  *              return object.  Common code that simplifies accessing objects
 217  *              that have required return objects of fixed types.
 218  *
 219  *              NOTE: Internal function, no parameter validation
 220  *
 221  ******************************************************************************/
 222
 223 acpi_status
 224 acpi_ut_evaluate_object(struct acpi_namespace_node *prefix_node,
 225                         char *path,
 226                         u32 expected_return_btypes,
 227                         union acpi_operand_object **return_desc)
 228 {
 229         struct acpi_evaluate_info *info;
 230         acpi_status status;
 231         u32 return_btype;
 232
 233         ACPI_FUNCTION_TRACE(ut_evaluate_object);
 234
 235         /* Allocate the evaluation information block */
 236
 237         info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
 238         if (!info) {
 239                 return_ACPI_STATUS(AE_NO_MEMORY);
 240         }
 241
 242         info->prefix_node = prefix_node;
 243         info->pathname = path;
 244
 245         /* Evaluate the object/method */
 246
 247         status = acpi_ns_evaluate(info);
 248         if (ACPI_FAILURE(status)) {
 249                 if (status == AE_NOT_FOUND) {
 250                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 251                                           "[%4.4s.%s] was not found\n",
 252                                           acpi_ut_get_node_name(prefix_node),
 253                                           path));
 254                 } else {
 255                         ACPI_ERROR_METHOD("Method execution failed",
 256                                           prefix_node, path, status);
 257                 }
 258
 259                 goto cleanup;
 260         }
 261
 262         /* Did we get a return object? */
 263
 264         if (!info->return_object) {
 265                 if (expected_return_btypes) {
 266                         ACPI_ERROR_METHOD("No object was returned from",
 267                                           prefix_node, path, AE_NOT_EXIST);
 268
 269                         status = AE_NOT_EXIST;
 270                 }
 271
 272                 goto cleanup;
 273         }
 274
 275         /* Map the return object type to the bitmapped type */
 276
 277         switch ((info->return_object)->common.type) {
 278         case ACPI_TYPE_INTEGER:
 279                 return_btype = ACPI_BTYPE_INTEGER;
 280                 break;
 281
 282         case ACPI_TYPE_BUFFER:
 283                 return_btype = ACPI_BTYPE_BUFFER;
 284                 break;
 285
 286         case ACPI_TYPE_STRING:
 287                 return_btype = ACPI_BTYPE_STRING;
 288                 break;
 289
 290         case ACPI_TYPE_PACKAGE:
 291                 return_btype = ACPI_BTYPE_PACKAGE;
 292                 break;
 293
 294         default:
 295                 return_btype = 0;
 296                 break;
 297         }
 298
 299         if ((acpi_gbl_enable_interpreter_slack) && (!expected_return_btypes)) {
 300                 /*
 301                  * We received a return object, but one was not expected.  This can
 302                  * happen frequently if the "implicit return" feature is enabled.
 303                  * Just delete the return object and return AE_OK.
 304                  */
 305                 acpi_ut_remove_reference(info->return_object);
 306                 goto cleanup;
 307         }
 308
 309         /* Is the return object one of the expected types? */
 310
 311         if (!(expected_return_btypes & return_btype)) {
 312                 ACPI_ERROR_METHOD("Return object type is incorrect",
 313                                   prefix_node, path, AE_TYPE);
 314
 315                 ACPI_ERROR((AE_INFO,
 316                             "Type returned from %s was incorrect: %s, expected Btypes: %X",
 317                             path,
 318                             acpi_ut_get_object_type_name(info->return_object),
 319                             expected_return_btypes));
 320
 321                 /* On error exit, we must delete the return object */
 322
 323                 acpi_ut_remove_reference(info->return_object);
 324                 status = AE_TYPE;
 325                 goto cleanup;
 326         }
 327
 328         /* Object type is OK, return it */
 329
 330         *return_desc = info->return_object;
 331
 332       cleanup:
 333         ACPI_FREE(info);
 334         return_ACPI_STATUS(status);
 335 }
 336
 337 /*******************************************************************************
 338  *
 339  * FUNCTION:    acpi_ut_evaluate_numeric_object
 340  *
 341  * PARAMETERS:  object_name         - Object name to be evaluated
 342  *              device_node         - Node for the device
 343  *              Address             - Where the value is returned
 344  *
 345  * RETURN:      Status
 346  *
 347  * DESCRIPTION: Evaluates a numeric namespace object for a selected device
 348  *              and stores result in *Address.
 349  *
 350  *              NOTE: Internal function, no parameter validation
 351  *
 352  ******************************************************************************/
 353
 354 acpi_status
 355 acpi_ut_evaluate_numeric_object(char *object_name,
 356                                 struct acpi_namespace_node *device_node,
 357                                 acpi_integer * address)
 358 {
 359         union acpi_operand_object *obj_desc;
 360         acpi_status status;
 361
 362         ACPI_FUNCTION_TRACE(ut_evaluate_numeric_object);
 363
 364         status = acpi_ut_evaluate_object(device_node, object_name,
 365                                          ACPI_BTYPE_INTEGER, &obj_desc);
 366         if (ACPI_FAILURE(status)) {
 367                 return_ACPI_STATUS(status);
 368         }
 369
 370         /* Get the returned Integer */
 371
 372         *address = obj_desc->integer.value;
 373
 374         /* On exit, we must delete the return object */
 375
 376         acpi_ut_remove_reference(obj_desc);
 377         return_ACPI_STATUS(status);
 378 }
 379
 380 /*******************************************************************************
 381  *
 382  * FUNCTION:    acpi_ut_copy_id_string
 383  *
 384  * PARAMETERS:  Destination         - Where to copy the string
 385  *              Source              - Source string
 386  *              max_length          - Length of the destination buffer
 387  *
 388  * RETURN:      None
 389  *
 390  * DESCRIPTION: Copies an ID string for the _HID, _CID, and _UID methods.
 391  *              Performs removal of a leading asterisk if present -- workaround
 392  *              for a known issue on a bunch of machines.
 393  *
 394  ******************************************************************************/
 395
 396 static void
 397 acpi_ut_copy_id_string(char *destination, char *source, acpi_size max_length)
 398 {
 399
 400         /*
 401          * Workaround for ID strings that have a leading asterisk. This construct
 402          * is not allowed by the ACPI specification  (ID strings must be
 403          * alphanumeric), but enough existing machines have this embedded in their
 404          * ID strings that the following code is useful.
 405          */
 406         if (*source == '*') {
 407                 source++;
 408         }
 409
 410         /* Do the actual copy */
 411
 412         ACPI_STRNCPY(destination, source, max_length);
 413 }
 414
 415 /*******************************************************************************
 416  *
 417  * FUNCTION:    acpi_ut_execute_HID
 418  *
 419  * PARAMETERS:  device_node         - Node for the device
 420  *              Hid                 - Where the HID is returned
 421  *
 422  * RETURN:      Status
 423  *
 424  * DESCRIPTION: Executes the _HID control method that returns the hardware
 425  *              ID of the device.
 426  *
 427  *              NOTE: Internal function, no parameter validation
 428  *
 429  ******************************************************************************/
 430
 431 acpi_status
 432 acpi_ut_execute_HID(struct acpi_namespace_node *device_node,
 433                     struct acpica_device_id *hid)
 434 {
 435         union acpi_operand_object *obj_desc;
 436         acpi_status status;
 437
 438         ACPI_FUNCTION_TRACE(ut_execute_HID);
 439
 440         status = acpi_ut_evaluate_object(device_node, METHOD_NAME__HID,
 441                                          ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING,
 442                                          &obj_desc);
 443         if (ACPI_FAILURE(status)) {
 444                 return_ACPI_STATUS(status);
 445         }
 446
 447         if (obj_desc->common.type == ACPI_TYPE_INTEGER) {
 448
 449                 /* Convert the Numeric HID to string */
 450
 451                 acpi_ex_eisa_id_to_string((u32) obj_desc->integer.value,
 452                                           hid->value);
 453         } else {
 454                 /* Copy the String HID from the returned object */
 455
 456                 acpi_ut_copy_id_string(hid->value, obj_desc->string.pointer,
 457                                        sizeof(hid->value));
 458         }
 459
 460         /* On exit, we must delete the return object */
 461
 462         acpi_ut_remove_reference(obj_desc);
 463         return_ACPI_STATUS(status);
 464 }
 465
 466 /*******************************************************************************
 467  *
 468  * FUNCTION:    acpi_ut_translate_one_cid
 469  *
 470  * PARAMETERS:  obj_desc            - _CID object, must be integer or string
 471  *              one_cid             - Where the CID string is returned
 472  *
 473  * RETURN:      Status
 474  *
 475  * DESCRIPTION: Return a numeric or string _CID value as a string.
 476  *              (Compatible ID)
 477  *
 478  *              NOTE:  Assumes a maximum _CID string length of
 479  *                     ACPI_MAX_CID_LENGTH.
 480  *
 481  ******************************************************************************/
 482
 483 static acpi_status
 484 acpi_ut_translate_one_cid(union acpi_operand_object *obj_desc,
 485                           struct acpi_compatible_id *one_cid)
 486 {
 487
 488         switch (obj_desc->common.type) {
 489         case ACPI_TYPE_INTEGER:
 490
 491                 /* Convert the Numeric CID to string */
 492
 493                 acpi_ex_eisa_id_to_string((u32) obj_desc->integer.value,
 494                                           one_cid->value);
 495                 return (AE_OK);
 496
 497         case ACPI_TYPE_STRING:
 498
 499                 if (obj_desc->string.length > ACPI_MAX_CID_LENGTH) {
 500                         return (AE_AML_STRING_LIMIT);
 501                 }
 502
 503                 /* Copy the String CID from the returned object */
 504
 505                 acpi_ut_copy_id_string(one_cid->value, obj_desc->string.pointer,
 506                                        ACPI_MAX_CID_LENGTH);
 507                 return (AE_OK);
 508
 509         default:
 510
 511                 return (AE_TYPE);
 512         }
 513 }
 514
 515 /*******************************************************************************
 516  *
 517  * FUNCTION:    acpi_ut_execute_CID
 518  *
 519  * PARAMETERS:  device_node         - Node for the device
 520  *              return_cid_list     - Where the CID list is returned
 521  *
 522  * RETURN:      Status
 523  *
 524  * DESCRIPTION: Executes the _CID control method that returns one or more
 525  *              compatible hardware IDs for the device.
 526  *
 527  *              NOTE: Internal function, no parameter validation
 528  *
 529  ******************************************************************************/
 530
 531 acpi_status
 532 acpi_ut_execute_CID(struct acpi_namespace_node * device_node,
 533                     struct acpi_compatible_id_list ** return_cid_list)
 534 {
 535         union acpi_operand_object *obj_desc;
 536         acpi_status status;
 537         u32 count;
 538         u32 size;
 539         struct acpi_compatible_id_list *cid_list;
 540         u32 i;
 541
 542         ACPI_FUNCTION_TRACE(ut_execute_CID);
 543
 544         /* Evaluate the _CID method for this device */
 545
 546         status = acpi_ut_evaluate_object(device_node, METHOD_NAME__CID,
 547                                          ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING
 548                                          | ACPI_BTYPE_PACKAGE, &obj_desc);
 549         if (ACPI_FAILURE(status)) {
 550                 return_ACPI_STATUS(status);
 551         }
 552
 553         /* Get the number of _CIDs returned */
 554
 555         count = 1;
 556         if (obj_desc->common.type == ACPI_TYPE_PACKAGE) {
 557                 count = obj_desc->package.count;
 558         }
 559
 560         /* Allocate a worst-case buffer for the _CIDs */
 561
 562         size = (((count - 1) * sizeof(struct acpi_compatible_id)) +
 563                 sizeof(struct acpi_compatible_id_list));
 564
 565         cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
 566         if (!cid_list) {
 567                 return_ACPI_STATUS(AE_NO_MEMORY);
 568         }
 569
 570         /* Init CID list */
 571
 572         cid_list->count = count;
 573         cid_list->size = size;
 574
 575         /*
 576          *  A _CID can return either a single compatible ID or a package of
 577          *  compatible IDs.  Each compatible ID can be one of the following:
 578          *  1) Integer (32 bit compressed EISA ID) or
 579          *  2) String (PCI ID format, e.g. "PCI\VEN_vvvv&DEV_dddd&SUBSYS_ssssssss")
 580          */
 581
 582         /* The _CID object can be either a single CID or a package (list) of CIDs */
 583
 584         if (obj_desc->common.type == ACPI_TYPE_PACKAGE) {
 585
 586                 /* Translate each package element */
 587
 588                 for (i = 0; i < count; i++) {
 589                         status =
 590                             acpi_ut_translate_one_cid(obj_desc->package.
 591                                                       elements[i],
 592                                                       &cid_list->id[i]);
 593                         if (ACPI_FAILURE(status)) {
 594                                 break;
 595                         }
 596                 }
 597         } else {
 598                 /* Only one CID, translate to a string */
 599
 600                 status = acpi_ut_translate_one_cid(obj_desc, cid_list->id);
 601         }
 602
 603         /* Cleanup on error */
 604
 605         if (ACPI_FAILURE(status)) {
 606                 ACPI_FREE(cid_list);
 607         } else {
 608                 *return_cid_list = cid_list;
 609         }
 610
 611         /* On exit, we must delete the _CID return object */
 612
 613         acpi_ut_remove_reference(obj_desc);
 614         return_ACPI_STATUS(status);
 615 }
 616
 617 /*******************************************************************************
 618  *
 619  * FUNCTION:    acpi_ut_execute_UID
 620  *
 621  * PARAMETERS:  device_node         - Node for the device
 622  *              Uid                 - Where the UID is returned
 623  *
 624  * RETURN:      Status
 625  *
 626  * DESCRIPTION: Executes the _UID control method that returns the hardware
 627  *              ID of the device.
 628  *
 629  *              NOTE: Internal function, no parameter validation
 630  *
 631  ******************************************************************************/
 632
 633 acpi_status
 634 acpi_ut_execute_UID(struct acpi_namespace_node *device_node,
 635                     struct acpica_device_id *uid)
 636 {
 637         union acpi_operand_object *obj_desc;
 638         acpi_status status;
 639
 640         ACPI_FUNCTION_TRACE(ut_execute_UID);
 641
 642         status = acpi_ut_evaluate_object(device_node, METHOD_NAME__UID,
 643                                          ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING,
 644                                          &obj_desc);
 645         if (ACPI_FAILURE(status)) {
 646                 return_ACPI_STATUS(status);
 647         }
 648
 649         if (obj_desc->common.type == ACPI_TYPE_INTEGER) {
 650
 651                 /* Convert the Numeric UID to string */
 652
 653                 acpi_ex_unsigned_integer_to_string(obj_desc->integer.value,
 654                                                    uid->value);
 655         } else {
 656                 /* Copy the String UID from the returned object */
 657
 658                 acpi_ut_copy_id_string(uid->value, obj_desc->string.pointer,
 659                                        sizeof(uid->value));
 660         }
 661
 662         /* On exit, we must delete the return object */
 663
 664         acpi_ut_remove_reference(obj_desc);
 665         return_ACPI_STATUS(status);
 666 }
 667
 668 /*******************************************************************************
 669  *
 670  * FUNCTION:    acpi_ut_execute_STA
 671  *
 672  * PARAMETERS:  device_node         - Node for the device
 673  *              Flags               - Where the status flags are returned
 674  *
 675  * RETURN:      Status
 676  *
 677  * DESCRIPTION: Executes _STA for selected device and stores results in
 678  *              *Flags.
 679  *
 680  *              NOTE: Internal function, no parameter validation
 681  *
 682  ******************************************************************************/
 683
 684 acpi_status
 685 acpi_ut_execute_STA(struct acpi_namespace_node *device_node, u32 * flags)
 686 {
 687         union acpi_operand_object *obj_desc;
 688         acpi_status status;
 689
 690         ACPI_FUNCTION_TRACE(ut_execute_STA);
 691
 692         status = acpi_ut_evaluate_object(device_node, METHOD_NAME__STA,
 693                                          ACPI_BTYPE_INTEGER, &obj_desc);
 694         if (ACPI_FAILURE(status)) {
 695                 if (AE_NOT_FOUND == status) {
 696                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 697                                           "_STA on %4.4s was not found, assuming device is present\n",
 698                                           acpi_ut_get_node_name(device_node)));
 699
 700                         *flags = ACPI_UINT32_MAX;
 701                         status = AE_OK;
 702                 }
 703
 704                 return_ACPI_STATUS(status);
 705         }
 706
 707         /* Extract the status flags */
 708
 709         *flags = (u32) obj_desc->integer.value;
 710
 711         /* On exit, we must delete the return object */
 712
 713         acpi_ut_remove_reference(obj_desc);
 714         return_ACPI_STATUS(status);
 715 }
 716
 717 /*******************************************************************************
 718  *
 719  * FUNCTION:    acpi_ut_execute_Sxds
 720  *
 721  * PARAMETERS:  device_node         - Node for the device
 722  *              Flags               - Where the status flags are returned
 723  *
 724  * RETURN:      Status
 725  *
 726  * DESCRIPTION: Executes _STA for selected device and stores results in
 727  *              *Flags.
 728  *
 729  *              NOTE: Internal function, no parameter validation
 730  *
 731  ******************************************************************************/
 732
 733 acpi_status
 734 acpi_ut_execute_sxds(struct acpi_namespace_node *device_node, u8 * highest)
 735 {
 736         union acpi_operand_object *obj_desc;
 737         acpi_status status;
 738         u32 i;
 739
 740         ACPI_FUNCTION_TRACE(ut_execute_sxds);
 741
 742         for (i = 0; i < 4; i++) {
 743                 highest[i] = 0xFF;
 744                 status = acpi_ut_evaluate_object(device_node,
 745                                                  ACPI_CAST_PTR(char,
 746                                                                acpi_gbl_highest_dstate_names
 747                                                                [i]),
 748                                                  ACPI_BTYPE_INTEGER, &obj_desc);
 749                 if (ACPI_FAILURE(status)) {
 750                         if (status != AE_NOT_FOUND) {
 751                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 752                                                   "%s on Device %4.4s, %s\n",
 753                                                   ACPI_CAST_PTR(char,
 754                                                                 acpi_gbl_highest_dstate_names
 755                                                                 [i]),
 756                                                   acpi_ut_get_node_name
 757                                                   (device_node),
 758                                                   acpi_format_exception
 759                                                   (status)));
 760
 761                                 return_ACPI_STATUS(status);
 762                         }
 763                 } else {
 764                         /* Extract the Dstate value */
 765
 766                         highest[i] = (u8) obj_desc->integer.value;
 767
 768                         /* Delete the return object */
 769
 770                         acpi_ut_remove_reference(obj_desc);
 771                 }
 772         }
 773
 774         return_ACPI_STATUS(AE_OK);
 775 }