release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/acpi/acpica/uteval.c

   1 /******************************************************************************
   2  *
   3  * Module Name: uteval - Object evaluation
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2010, 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
  48 #define _COMPONENT          ACPI_UTILITIES
  49 ACPI_MODULE_NAME("uteval")
  50
  51 /*
  52  * Strings supported by the _OSI predefined (internal) method.
  53  *
  54  * March 2009: Removed "Linux" as this host no longer wants to respond true
  55  * for this string. Basically, the only safe OS strings are windows-related
  56  * and in many or most cases represent the only test path within the
  57  * BIOS-provided ASL code.
  58  *
  59  * The second element of each entry is used to track the newest version of
  60  * Windows that the BIOS has requested.
  61  */
  62 static struct acpi_interface_info acpi_interfaces_supported[] = {
  63         /* Operating System Vendor Strings */
  64
  65         {"Windows 2000", ACPI_OSI_WIN_2000},    /* Windows 2000 */
  66         {"Windows 2001", ACPI_OSI_WIN_XP},      /* Windows XP */
  67         {"Windows 2001 SP1", ACPI_OSI_WIN_XP_SP1},      /* Windows XP SP1 */
  68         {"Windows 2001.1", ACPI_OSI_WINSRV_2003},       /* Windows Server 2003 */
  69         {"Windows 2001 SP2", ACPI_OSI_WIN_XP_SP2},      /* Windows XP SP2 */
  70         {"Windows 2001.1 SP1", ACPI_OSI_WINSRV_2003_SP1},       /* Windows Server 2003 SP1 - Added 03/2006 */
  71         {"Windows 2006", ACPI_OSI_WIN_VISTA},   /* Windows Vista - Added 03/2006 */
  72         {"Windows 2006.1", ACPI_OSI_WINSRV_2008},       /* Windows Server 2008 - Added 09/2009 */
  73         {"Windows 2006 SP1", ACPI_OSI_WIN_VISTA_SP1},   /* Windows Vista SP1 - Added 09/2009 */
  74         {"Windows 2009", ACPI_OSI_WIN_7},       /* Windows 7 and Server 2008 R2 - Added 09/2009 */
  75
  76         /* Feature Group Strings */
  77
  78         {"Extended Address Space Descriptor", 0}
  79
  80         /*
  81          * All "optional" feature group strings (features that are implemented
  82          * by the host) should be implemented in the host version of
  83          * acpi_os_validate_interface and should not be added here.
  84          */
  85 };
  86
  87 /*******************************************************************************
  88  *
  89  * FUNCTION:    acpi_ut_osi_implementation
  90  *
  91  * PARAMETERS:  walk_state          - Current walk state
  92  *
  93  * RETURN:      Status
  94  *
  95  * DESCRIPTION: Implementation of the _OSI predefined control method
  96  *
  97  ******************************************************************************/
  98
  99 acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state)
 100 {
 101         acpi_status status;
 102         union acpi_operand_object *string_desc;
 103         union acpi_operand_object *return_desc;
 104         u32 return_value;
 105         u32 i;
 106
 107         ACPI_FUNCTION_TRACE(ut_osi_implementation);
 108
 109         /* Validate the string input argument */
 110
 111         string_desc = walk_state->arguments[0].object;
 112         if (!string_desc || (string_desc->common.type != ACPI_TYPE_STRING)) {
 113                 return_ACPI_STATUS(AE_TYPE);
 114         }
 115
 116         /* Create a return object */
 117
 118         return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 119         if (!return_desc) {
 120                 return_ACPI_STATUS(AE_NO_MEMORY);
 121         }
 122
 123         /* Default return value is 0, NOT SUPPORTED */
 124
 125         return_value = 0;
 126
 127         /* Compare input string to static table of supported interfaces */
 128
 129         for (i = 0; i < ACPI_ARRAY_LENGTH(acpi_interfaces_supported); i++) {
 130                 if (!ACPI_STRCMP(string_desc->string.pointer,
 131                                  acpi_interfaces_supported[i].name)) {
 132                         /*
 133                          * The interface is supported.
 134                          * Update the osi_data if necessary. We keep track of the latest
 135                          * version of Windows that has been requested by the BIOS.
 136                          */
 137                         if (acpi_interfaces_supported[i].value >
 138                             acpi_gbl_osi_data) {
 139                                 acpi_gbl_osi_data =
 140                                     acpi_interfaces_supported[i].value;
 141                         }
 142
 143                         return_value = ACPI_UINT32_MAX;
 144                         goto exit;
 145                 }
 146         }
 147
 148         /*
 149          * Did not match the string in the static table, call the host OSL to
 150          * check for a match with one of the optional strings (such as
 151          * "Module Device", "3.0 Thermal Model", etc.)
 152          */
 153         status = acpi_os_validate_interface(string_desc->string.pointer);
 154         if (ACPI_SUCCESS(status)) {
 155
 156                 /* The interface is supported */
 157
 158                 return_value = ACPI_UINT32_MAX;
 159         }
 160
 161 exit:
 162         ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INFO,
 163                 "ACPI: BIOS _OSI(%s) is %ssupported\n",
 164                 string_desc->string.pointer, return_value == 0 ? "not " : ""));
 165
 166         /* Complete the return value */
 167
 168         return_desc->integer.value = return_value;
 169         walk_state->return_desc = return_desc;
 170         return_ACPI_STATUS (AE_OK);
 171 }
 172
 173 /*******************************************************************************
 174  *
 175  * FUNCTION:    acpi_osi_invalidate
 176  *
 177  * PARAMETERS:  interface_string
 178  *
 179  * RETURN:      Status
 180  *
 181  * DESCRIPTION: invalidate string in pre-defiend _OSI string list
 182  *
 183  ******************************************************************************/
 184
 185 acpi_status acpi_osi_invalidate(char *interface)
 186 {
 187         int i;
 188
 189         for (i = 0; i < ACPI_ARRAY_LENGTH(acpi_interfaces_supported); i++) {
 190                 if (!ACPI_STRCMP(interface, acpi_interfaces_supported[i].name)) {
 191                         *acpi_interfaces_supported[i].name = '\0';
 192                         return AE_OK;
 193                 }
 194         }
 195         return AE_NOT_FOUND;
 196 }
 197
 198 /*******************************************************************************
 199  *
 200  * FUNCTION:    acpi_ut_evaluate_object
 201  *
 202  * PARAMETERS:  prefix_node         - Starting node
 203  *              Path                - Path to object from starting node
 204  *              expected_return_types - Bitmap of allowed return types
 205  *              return_desc         - Where a return value is stored
 206  *
 207  * RETURN:      Status
 208  *
 209  * DESCRIPTION: Evaluates a namespace object and verifies the type of the
 210  *              return object. Common code that simplifies accessing objects
 211  *              that have required return objects of fixed types.
 212  *
 213  *              NOTE: Internal function, no parameter validation
 214  *
 215  ******************************************************************************/
 216
 217 acpi_status
 218 acpi_ut_evaluate_object(struct acpi_namespace_node *prefix_node,
 219                         char *path,
 220                         u32 expected_return_btypes,
 221                         union acpi_operand_object **return_desc)
 222 {
 223         struct acpi_evaluate_info *info;
 224         acpi_status status;
 225         u32 return_btype;
 226
 227         ACPI_FUNCTION_TRACE(ut_evaluate_object);
 228
 229         /* Allocate the evaluation information block */
 230
 231         info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
 232         if (!info) {
 233                 return_ACPI_STATUS(AE_NO_MEMORY);
 234         }
 235
 236         info->prefix_node = prefix_node;
 237         info->pathname = path;
 238
 239         /* Evaluate the object/method */
 240
 241         status = acpi_ns_evaluate(info);
 242         if (ACPI_FAILURE(status)) {
 243                 if (status == AE_NOT_FOUND) {
 244                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 245                                           "[%4.4s.%s] was not found\n",
 246                                           acpi_ut_get_node_name(prefix_node),
 247                                           path));
 248                 } else {
 249                         ACPI_ERROR_METHOD("Method execution failed",
 250                                           prefix_node, path, status);
 251                 }
 252
 253                 goto cleanup;
 254         }
 255
 256         /* Did we get a return object? */
 257
 258         if (!info->return_object) {
 259                 if (expected_return_btypes) {
 260                         ACPI_ERROR_METHOD("No object was returned from",
 261                                           prefix_node, path, AE_NOT_EXIST);
 262
 263                         status = AE_NOT_EXIST;
 264                 }
 265
 266                 goto cleanup;
 267         }
 268
 269         /* Map the return object type to the bitmapped type */
 270
 271         switch ((info->return_object)->common.type) {
 272         case ACPI_TYPE_INTEGER:
 273                 return_btype = ACPI_BTYPE_INTEGER;
 274                 break;
 275
 276         case ACPI_TYPE_BUFFER:
 277                 return_btype = ACPI_BTYPE_BUFFER;
 278                 break;
 279
 280         case ACPI_TYPE_STRING:
 281                 return_btype = ACPI_BTYPE_STRING;
 282                 break;
 283
 284         case ACPI_TYPE_PACKAGE:
 285                 return_btype = ACPI_BTYPE_PACKAGE;
 286                 break;
 287
 288         default:
 289                 return_btype = 0;
 290                 break;
 291         }
 292
 293         if ((acpi_gbl_enable_interpreter_slack) && (!expected_return_btypes)) {
 294                 /*
 295                  * We received a return object, but one was not expected. This can
 296                  * happen frequently if the "implicit return" feature is enabled.
 297                  * Just delete the return object and return AE_OK.
 298                  */
 299                 acpi_ut_remove_reference(info->return_object);
 300                 goto cleanup;
 301         }
 302
 303         /* Is the return object one of the expected types? */
 304
 305         if (!(expected_return_btypes & return_btype)) {
 306                 ACPI_ERROR_METHOD("Return object type is incorrect",
 307                                   prefix_node, path, AE_TYPE);
 308
 309                 ACPI_ERROR((AE_INFO,
 310                             "Type returned from %s was incorrect: %s, expected Btypes: 0x%X",
 311                             path,
 312                             acpi_ut_get_object_type_name(info->return_object),
 313                             expected_return_btypes));
 314
 315                 /* On error exit, we must delete the return object */
 316
 317                 acpi_ut_remove_reference(info->return_object);
 318                 status = AE_TYPE;
 319                 goto cleanup;
 320         }
 321
 322         /* Object type is OK, return it */
 323
 324         *return_desc = info->return_object;
 325
 326       cleanup:
 327         ACPI_FREE(info);
 328         return_ACPI_STATUS(status);
 329 }
 330
 331 /*******************************************************************************
 332  *
 333  * FUNCTION:    acpi_ut_evaluate_numeric_object
 334  *
 335  * PARAMETERS:  object_name         - Object name to be evaluated
 336  *              device_node         - Node for the device
 337  *              Value               - Where the value is returned
 338  *
 339  * RETURN:      Status
 340  *
 341  * DESCRIPTION: Evaluates a numeric namespace object for a selected device
 342  *              and stores result in *Value.
 343  *
 344  *              NOTE: Internal function, no parameter validation
 345  *
 346  ******************************************************************************/
 347
 348 acpi_status
 349 acpi_ut_evaluate_numeric_object(char *object_name,
 350                                 struct acpi_namespace_node *device_node,
 351                                 u64 *value)
 352 {
 353         union acpi_operand_object *obj_desc;
 354         acpi_status status;
 355
 356         ACPI_FUNCTION_TRACE(ut_evaluate_numeric_object);
 357
 358         status = acpi_ut_evaluate_object(device_node, object_name,
 359                                          ACPI_BTYPE_INTEGER, &obj_desc);
 360         if (ACPI_FAILURE(status)) {
 361                 return_ACPI_STATUS(status);
 362         }
 363
 364         /* Get the returned Integer */
 365
 366         *value = obj_desc->integer.value;
 367
 368         /* On exit, we must delete the return object */
 369
 370         acpi_ut_remove_reference(obj_desc);
 371         return_ACPI_STATUS(status);
 372 }
 373
 374 /*******************************************************************************
 375  *
 376  * FUNCTION:    acpi_ut_execute_STA
 377  *
 378  * PARAMETERS:  device_node         - Node for the device
 379  *              Flags               - Where the status flags are returned
 380  *
 381  * RETURN:      Status
 382  *
 383  * DESCRIPTION: Executes _STA for selected device and stores results in
 384  *              *Flags.
 385  *
 386  *              NOTE: Internal function, no parameter validation
 387  *
 388  ******************************************************************************/
 389
 390 acpi_status
 391 acpi_ut_execute_STA(struct acpi_namespace_node *device_node, u32 * flags)
 392 {
 393         union acpi_operand_object *obj_desc;
 394         acpi_status status;
 395
 396         ACPI_FUNCTION_TRACE(ut_execute_STA);
 397
 398         status = acpi_ut_evaluate_object(device_node, METHOD_NAME__STA,
 399                                          ACPI_BTYPE_INTEGER, &obj_desc);
 400         if (ACPI_FAILURE(status)) {
 401                 if (AE_NOT_FOUND == status) {
 402                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 403                                           "_STA on %4.4s was not found, assuming device is present\n",
 404                                           acpi_ut_get_node_name(device_node)));
 405
 406                         *flags = ACPI_UINT32_MAX;
 407                         status = AE_OK;
 408                 }
 409
 410                 return_ACPI_STATUS(status);
 411         }
 412
 413         /* Extract the status flags */
 414
 415         *flags = (u32) obj_desc->integer.value;
 416
 417         /* On exit, we must delete the return object */
 418
 419         acpi_ut_remove_reference(obj_desc);
 420         return_ACPI_STATUS(status);
 421 }
 422
 423 /*******************************************************************************
 424  *
 425  * FUNCTION:    acpi_ut_execute_power_methods
 426  *
 427  * PARAMETERS:  device_node         - Node for the device
 428  *              method_names        - Array of power method names
 429  *              method_count        - Number of methods to execute
 430  *              out_values          - Where the power method values are returned
 431  *
 432  * RETURN:      Status, out_values
 433  *
 434  * DESCRIPTION: Executes the specified power methods for the device and returns
 435  *              the result(s).
 436  *
 437  *              NOTE: Internal function, no parameter validation
 438  *
 439 ******************************************************************************/
 440
 441 acpi_status
 442 acpi_ut_execute_power_methods(struct acpi_namespace_node *device_node,
 443                               const char **method_names,
 444                               u8 method_count, u8 *out_values)
 445 {
 446         union acpi_operand_object *obj_desc;
 447         acpi_status status;
 448         acpi_status final_status = AE_NOT_FOUND;
 449         u32 i;
 450
 451         ACPI_FUNCTION_TRACE(ut_execute_power_methods);
 452
 453         for (i = 0; i < method_count; i++) {
 454                 /*
 455                  * Execute the power method (_sx_d or _sx_w). The only allowable
 456                  * return type is an Integer.
 457                  */
 458                 status = acpi_ut_evaluate_object(device_node,
 459                                                  ACPI_CAST_PTR(char,
 460                                                                method_names[i]),
 461                                                  ACPI_BTYPE_INTEGER, &obj_desc);
 462                 if (ACPI_SUCCESS(status)) {
 463                         out_values[i] = (u8)obj_desc->integer.value;
 464
 465                         /* Delete the return object */
 466
 467                         acpi_ut_remove_reference(obj_desc);
 468                         final_status = AE_OK;   /* At least one value is valid */
 469                         continue;
 470                 }
 471
 472                 out_values[i] = ACPI_UINT8_MAX;
 473                 if (status == AE_NOT_FOUND) {
 474                         continue;       /* Ignore if not found */
 475                 }
 476
 477                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 478                                   "Failed %s on Device %4.4s, %s\n",
 479                                   ACPI_CAST_PTR(char, method_names[i]),
 480                                   acpi_ut_get_node_name(device_node),
 481                                   acpi_format_exception(status)));
 482         }
 483
 484         return_ACPI_STATUS(final_status);
 485 }