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  *
  53  * FUNCTION:    acpi_ut_evaluate_object
  54  *
  55  * PARAMETERS:  prefix_node         - Starting node
  56  *              Path                - Path to object from starting node
  57  *              expected_return_types - Bitmap of allowed return types
  58  *              return_desc         - Where a return value is stored
  59  *
  60  * RETURN:      Status
  61  *
  62  * DESCRIPTION: Evaluates a namespace object and verifies the type of the
  63  *              return object. Common code that simplifies accessing objects
  64  *              that have required return objects of fixed types.
  65  *
  66  *              NOTE: Internal function, no parameter validation
  67  *
  68  ******************************************************************************/
  69
  70 acpi_status
  71 acpi_ut_evaluate_object(struct acpi_namespace_node *prefix_node,
  72                         char *path,
  73                         u32 expected_return_btypes,
  74                         union acpi_operand_object **return_desc)
  75 {
  76         struct acpi_evaluate_info *info;
  77         acpi_status status;
  78         u32 return_btype;
  79
  80         ACPI_FUNCTION_TRACE(ut_evaluate_object);
  81
  82         /* Allocate the evaluation information block */
  83
  84         info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
  85         if (!info) {
  86                 return_ACPI_STATUS(AE_NO_MEMORY);
  87         }
  88
  89         info->prefix_node = prefix_node;
  90         info->pathname = path;
  91
  92         /* Evaluate the object/method */
  93
  94         status = acpi_ns_evaluate(info);
  95         if (ACPI_FAILURE(status)) {
  96                 if (status == AE_NOT_FOUND) {
  97                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
  98                                           "[%4.4s.%s] was not found\n",
  99                                           acpi_ut_get_node_name(prefix_node),
 100                                           path));
 101                 } else {
 102                         ACPI_ERROR_METHOD("Method execution failed",
 103                                           prefix_node, path, status);
 104                 }
 105
 106                 goto cleanup;
 107         }
 108
 109         /* Did we get a return object? */
 110
 111         if (!info->return_object) {
 112                 if (expected_return_btypes) {
 113                         ACPI_ERROR_METHOD("No object was returned from",
 114                                           prefix_node, path, AE_NOT_EXIST);
 115
 116                         status = AE_NOT_EXIST;
 117                 }
 118
 119                 goto cleanup;
 120         }
 121
 122         /* Map the return object type to the bitmapped type */
 123
 124         switch ((info->return_object)->common.type) {
 125         case ACPI_TYPE_INTEGER:
 126                 return_btype = ACPI_BTYPE_INTEGER;
 127                 break;
 128
 129         case ACPI_TYPE_BUFFER:
 130                 return_btype = ACPI_BTYPE_BUFFER;
 131                 break;
 132
 133         case ACPI_TYPE_STRING:
 134                 return_btype = ACPI_BTYPE_STRING;
 135                 break;
 136
 137         case ACPI_TYPE_PACKAGE:
 138                 return_btype = ACPI_BTYPE_PACKAGE;
 139                 break;
 140
 141         default:
 142                 return_btype = 0;
 143                 break;
 144         }
 145
 146         if ((acpi_gbl_enable_interpreter_slack) && (!expected_return_btypes)) {
 147                 /*
 148                  * We received a return object, but one was not expected. This can
 149                  * happen frequently if the "implicit return" feature is enabled.
 150                  * Just delete the return object and return AE_OK.
 151                  */
 152                 acpi_ut_remove_reference(info->return_object);
 153                 goto cleanup;
 154         }
 155
 156         /* Is the return object one of the expected types? */
 157
 158         if (!(expected_return_btypes & return_btype)) {
 159                 ACPI_ERROR_METHOD("Return object type is incorrect",
 160                                   prefix_node, path, AE_TYPE);
 161
 162                 ACPI_ERROR((AE_INFO,
 163                             "Type returned from %s was incorrect: %s, expected Btypes: 0x%X",
 164                             path,
 165                             acpi_ut_get_object_type_name(info->return_object),
 166                             expected_return_btypes));
 167
 168                 /* On error exit, we must delete the return object */
 169
 170                 acpi_ut_remove_reference(info->return_object);
 171                 status = AE_TYPE;
 172                 goto cleanup;
 173         }
 174
 175         /* Object type is OK, return it */
 176
 177         *return_desc = info->return_object;
 178
 179       cleanup:
 180         ACPI_FREE(info);
 181         return_ACPI_STATUS(status);
 182 }
 183
 184 /*******************************************************************************
 185  *
 186  * FUNCTION:    acpi_ut_evaluate_numeric_object
 187  *
 188  * PARAMETERS:  object_name         - Object name to be evaluated
 189  *              device_node         - Node for the device
 190  *              Value               - Where the value is returned
 191  *
 192  * RETURN:      Status
 193  *
 194  * DESCRIPTION: Evaluates a numeric namespace object for a selected device
 195  *              and stores result in *Value.
 196  *
 197  *              NOTE: Internal function, no parameter validation
 198  *
 199  ******************************************************************************/
 200
 201 acpi_status
 202 acpi_ut_evaluate_numeric_object(char *object_name,
 203                                 struct acpi_namespace_node *device_node,
 204                                 u64 *value)
 205 {
 206         union acpi_operand_object *obj_desc;
 207         acpi_status status;
 208
 209         ACPI_FUNCTION_TRACE(ut_evaluate_numeric_object);
 210
 211         status = acpi_ut_evaluate_object(device_node, object_name,
 212                                          ACPI_BTYPE_INTEGER, &obj_desc);
 213         if (ACPI_FAILURE(status)) {
 214                 return_ACPI_STATUS(status);
 215         }
 216
 217         /* Get the returned Integer */
 218
 219         *value = obj_desc->integer.value;
 220
 221         /* On exit, we must delete the return object */
 222
 223         acpi_ut_remove_reference(obj_desc);
 224         return_ACPI_STATUS(status);
 225 }
 226
 227 /*******************************************************************************
 228  *
 229  * FUNCTION:    acpi_ut_execute_STA
 230  *
 231  * PARAMETERS:  device_node         - Node for the device
 232  *              Flags               - Where the status flags are returned
 233  *
 234  * RETURN:      Status
 235  *
 236  * DESCRIPTION: Executes _STA for selected device and stores results in
 237  *              *Flags.
 238  *
 239  *              NOTE: Internal function, no parameter validation
 240  *
 241  ******************************************************************************/
 242
 243 acpi_status
 244 acpi_ut_execute_STA(struct acpi_namespace_node *device_node, u32 * flags)
 245 {
 246         union acpi_operand_object *obj_desc;
 247         acpi_status status;
 248
 249         ACPI_FUNCTION_TRACE(ut_execute_STA);
 250
 251         status = acpi_ut_evaluate_object(device_node, METHOD_NAME__STA,
 252                                          ACPI_BTYPE_INTEGER, &obj_desc);
 253         if (ACPI_FAILURE(status)) {
 254                 if (AE_NOT_FOUND == status) {
 255                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 256                                           "_STA on %4.4s was not found, assuming device is present\n",
 257                                           acpi_ut_get_node_name(device_node)));
 258
 259                         *flags = ACPI_UINT32_MAX;
 260                         status = AE_OK;
 261                 }
 262
 263                 return_ACPI_STATUS(status);
 264         }
 265
 266         /* Extract the status flags */
 267
 268         *flags = (u32) obj_desc->integer.value;
 269
 270         /* On exit, we must delete the return object */
 271
 272         acpi_ut_remove_reference(obj_desc);
 273         return_ACPI_STATUS(status);
 274 }
 275
 276 /*******************************************************************************
 277  *
 278  * FUNCTION:    acpi_ut_execute_power_methods
 279  *
 280  * PARAMETERS:  device_node         - Node for the device
 281  *              method_names        - Array of power method names
 282  *              method_count        - Number of methods to execute
 283  *              out_values          - Where the power method values are returned
 284  *
 285  * RETURN:      Status, out_values
 286  *
 287  * DESCRIPTION: Executes the specified power methods for the device and returns
 288  *              the result(s).
 289  *
 290  *              NOTE: Internal function, no parameter validation
 291  *
 292 ******************************************************************************/
 293
 294 acpi_status
 295 acpi_ut_execute_power_methods(struct acpi_namespace_node *device_node,
 296                               const char **method_names,
 297                               u8 method_count, u8 *out_values)
 298 {
 299         union acpi_operand_object *obj_desc;
 300         acpi_status status;
 301         acpi_status final_status = AE_NOT_FOUND;
 302         u32 i;
 303
 304         ACPI_FUNCTION_TRACE(ut_execute_power_methods);
 305
 306         for (i = 0; i < method_count; i++) {
 307                 /*
 308                  * Execute the power method (_sx_d or _sx_w). The only allowable
 309                  * return type is an Integer.
 310                  */
 311                 status = acpi_ut_evaluate_object(device_node,
 312                                                  ACPI_CAST_PTR(char,
 313                                                                method_names[i]),
 314                                                  ACPI_BTYPE_INTEGER, &obj_desc);
 315                 if (ACPI_SUCCESS(status)) {
 316                         out_values[i] = (u8)obj_desc->integer.value;
 317
 318                         /* Delete the return object */
 319
 320                         acpi_ut_remove_reference(obj_desc);
 321                         final_status = AE_OK;   /* At least one value is valid */
 322                         continue;
 323                 }
 324
 325                 out_values[i] = ACPI_UINT8_MAX;
 326                 if (status == AE_NOT_FOUND) {
 327                         continue;       /* Ignore if not found */
 328                 }
 329
 330                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 331                                   "Failed %s on Device %4.4s, %s\n",
 332                                   ACPI_CAST_PTR(char, method_names[i]),
 333                                   acpi_ut_get_node_name(device_node),
 334                                   acpi_format_exception(status)));
 335         }
 336
 337         return_ACPI_STATUS(final_status);
 338 }