drivers/acpi/acpica/uteval.c

   1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
   2 /******************************************************************************
   3  *
   4  * Module Name: uteval - Object evaluation
   5  *
   6  * Copyright (C) 2000 - 2020, Intel Corp.
   7  *
   8  *****************************************************************************/
   9
  10 #include <acpi/acpi.h>
  11 #include "accommon.h"
  12 #include "acnamesp.h"
  13
  14 #define _COMPONENT          ACPI_UTILITIES
  15 ACPI_MODULE_NAME("uteval")
  16
  17 /*******************************************************************************
  18  *
  19  * FUNCTION:    acpi_ut_evaluate_object
  20  *
  21  * PARAMETERS:  prefix_node         - Starting node
  22  *              path                - Path to object from starting node
  23  *              expected_return_types - Bitmap of allowed return types
  24  *              return_desc         - Where a return value is stored
  25  *
  26  * RETURN:      Status
  27  *
  28  * DESCRIPTION: Evaluates a namespace object and verifies the type of the
  29  *              return object. Common code that simplifies accessing objects
  30  *              that have required return objects of fixed types.
  31  *
  32  *              NOTE: Internal function, no parameter validation
  33  *
  34  ******************************************************************************/
  35
  36 acpi_status
  37 acpi_ut_evaluate_object(struct acpi_namespace_node *prefix_node,
  38                         const char *path,
  39                         u32 expected_return_btypes,
  40                         union acpi_operand_object **return_desc)
  41 {
  42         struct acpi_evaluate_info *info;
  43         acpi_status status;
  44         u32 return_btype;
  45
  46         ACPI_FUNCTION_TRACE(ut_evaluate_object);
  47
  48         /* Allocate the evaluation information block */
  49
  50         info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
  51         if (!info) {
  52                 return_ACPI_STATUS(AE_NO_MEMORY);
  53         }
  54
  55         info->prefix_node = prefix_node;
  56         info->relative_pathname = path;
  57
  58         /* Evaluate the object/method */
  59
  60         status = acpi_ns_evaluate(info);
  61         if (ACPI_FAILURE(status)) {
  62                 if (status == AE_NOT_FOUND) {
  63                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
  64                                           "[%4.4s.%s] was not found\n",
  65                                           acpi_ut_get_node_name(prefix_node),
  66                                           path));
  67                 } else {
  68                         ACPI_ERROR_METHOD("Method execution failed",
  69                                           prefix_node, path, status);
  70                 }
  71
  72                 goto cleanup;
  73         }
  74
  75         /* Did we get a return object? */
  76
  77         if (!info->return_object) {
  78                 if (expected_return_btypes) {
  79                         ACPI_ERROR_METHOD("No object was returned from",
  80                                           prefix_node, path, AE_NOT_EXIST);
  81
  82                         status = AE_NOT_EXIST;
  83                 }
  84
  85                 goto cleanup;
  86         }
  87
  88         /* Map the return object type to the bitmapped type */
  89
  90         switch ((info->return_object)->common.type) {
  91         case ACPI_TYPE_INTEGER:
  92
  93                 return_btype = ACPI_BTYPE_INTEGER;
  94                 break;
  95
  96         case ACPI_TYPE_BUFFER:
  97
  98                 return_btype = ACPI_BTYPE_BUFFER;
  99                 break;
 100
 101         case ACPI_TYPE_STRING:
 102
 103                 return_btype = ACPI_BTYPE_STRING;
 104                 break;
 105
 106         case ACPI_TYPE_PACKAGE:
 107
 108                 return_btype = ACPI_BTYPE_PACKAGE;
 109                 break;
 110
 111         default:
 112
 113                 return_btype = 0;
 114                 break;
 115         }
 116
 117         if ((acpi_gbl_enable_interpreter_slack) && (!expected_return_btypes)) {
 118                 /*
 119                  * We received a return object, but one was not expected. This can
 120                  * happen frequently if the "implicit return" feature is enabled.
 121                  * Just delete the return object and return AE_OK.
 122                  */
 123                 acpi_ut_remove_reference(info->return_object);
 124                 goto cleanup;
 125         }
 126
 127         /* Is the return object one of the expected types? */
 128
 129         if (!(expected_return_btypes & return_btype)) {
 130                 ACPI_ERROR_METHOD("Return object type is incorrect",
 131                                   prefix_node, path, AE_TYPE);
 132
 133                 ACPI_ERROR((AE_INFO,
 134                             "Type returned from %s was incorrect: %s, expected Btypes: 0x%X",
 135                             path,
 136                             acpi_ut_get_object_type_name(info->return_object),
 137                             expected_return_btypes));
 138
 139                 /* On error exit, we must delete the return object */
 140
 141                 acpi_ut_remove_reference(info->return_object);
 142                 status = AE_TYPE;
 143                 goto cleanup;
 144         }
 145
 146         /* Object type is OK, return it */
 147
 148         *return_desc = info->return_object;
 149
 150 cleanup:
 151         ACPI_FREE(info);
 152         return_ACPI_STATUS(status);
 153 }
 154
 155 /*******************************************************************************
 156  *
 157  * FUNCTION:    acpi_ut_evaluate_numeric_object
 158  *
 159  * PARAMETERS:  object_name         - Object name to be evaluated
 160  *              device_node         - Node for the device
 161  *              value               - Where the value is returned
 162  *
 163  * RETURN:      Status
 164  *
 165  * DESCRIPTION: Evaluates a numeric namespace object for a selected device
 166  *              and stores result in *Value.
 167  *
 168  *              NOTE: Internal function, no parameter validation
 169  *
 170  ******************************************************************************/
 171
 172 acpi_status
 173 acpi_ut_evaluate_numeric_object(const char *object_name,
 174                                 struct acpi_namespace_node *device_node,
 175                                 u64 *value)
 176 {
 177         union acpi_operand_object *obj_desc;
 178         acpi_status status;
 179
 180         ACPI_FUNCTION_TRACE(ut_evaluate_numeric_object);
 181
 182         status = acpi_ut_evaluate_object(device_node, object_name,
 183                                          ACPI_BTYPE_INTEGER, &obj_desc);
 184         if (ACPI_FAILURE(status)) {
 185                 return_ACPI_STATUS(status);
 186         }
 187
 188         /* Get the returned Integer */
 189
 190         *value = obj_desc->integer.value;
 191
 192         /* On exit, we must delete the return object */
 193
 194         acpi_ut_remove_reference(obj_desc);
 195         return_ACPI_STATUS(status);
 196 }
 197
 198 /*******************************************************************************
 199  *
 200  * FUNCTION:    acpi_ut_execute_STA
 201  *
 202  * PARAMETERS:  device_node         - Node for the device
 203  *              flags               - Where the status flags are returned
 204  *
 205  * RETURN:      Status
 206  *
 207  * DESCRIPTION: Executes _STA for selected device and stores results in
 208  *              *Flags. If _STA does not exist, then the device is assumed
 209  *              to be present/functional/enabled (as per the ACPI spec).
 210  *
 211  *              NOTE: Internal function, no parameter validation
 212  *
 213  ******************************************************************************/
 214
 215 acpi_status
 216 acpi_ut_execute_STA(struct acpi_namespace_node *device_node, u32 * flags)
 217 {
 218         union acpi_operand_object *obj_desc;
 219         acpi_status status;
 220
 221         ACPI_FUNCTION_TRACE(ut_execute_STA);
 222
 223         status = acpi_ut_evaluate_object(device_node, METHOD_NAME__STA,
 224                                          ACPI_BTYPE_INTEGER, &obj_desc);
 225         if (ACPI_FAILURE(status)) {
 226                 if (AE_NOT_FOUND == status) {
 227                         /*
 228                          * if _STA does not exist, then (as per the ACPI specification),
 229                          * the returned flags will indicate that the device is present,
 230                          * functional, and enabled.
 231                          */
 232                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 233                                           "_STA on %4.4s was not found, assuming device is present\n",
 234                                           acpi_ut_get_node_name(device_node)));
 235
 236                         *flags = ACPI_UINT32_MAX;
 237                         status = AE_OK;
 238                 }
 239
 240                 return_ACPI_STATUS(status);
 241         }
 242
 243         /* Extract the status flags */
 244
 245         *flags = (u32) obj_desc->integer.value;
 246
 247         /* On exit, we must delete the return object */
 248
 249         acpi_ut_remove_reference(obj_desc);
 250         return_ACPI_STATUS(status);
 251 }
 252
 253 /*******************************************************************************
 254  *
 255  * FUNCTION:    acpi_ut_execute_power_methods
 256  *
 257  * PARAMETERS:  device_node         - Node for the device
 258  *              method_names        - Array of power method names
 259  *              method_count        - Number of methods to execute
 260  *              out_values          - Where the power method values are returned
 261  *
 262  * RETURN:      Status, out_values
 263  *
 264  * DESCRIPTION: Executes the specified power methods for the device and returns
 265  *              the result(s).
 266  *
 267  *              NOTE: Internal function, no parameter validation
 268  *
 269 ******************************************************************************/
 270
 271 acpi_status
 272 acpi_ut_execute_power_methods(struct acpi_namespace_node *device_node,
 273                               const char **method_names,
 274                               u8 method_count, u8 *out_values)
 275 {
 276         union acpi_operand_object *obj_desc;
 277         acpi_status status;
 278         acpi_status final_status = AE_NOT_FOUND;
 279         u32 i;
 280
 281         ACPI_FUNCTION_TRACE(ut_execute_power_methods);
 282
 283         for (i = 0; i < method_count; i++) {
 284                 /*
 285                  * Execute the power method (_sx_d or _sx_w). The only allowable
 286                  * return type is an Integer.
 287                  */
 288                 status = acpi_ut_evaluate_object(device_node,
 289                                                  ACPI_CAST_PTR(char,
 290                                                                method_names[i]),
 291                                                  ACPI_BTYPE_INTEGER, &obj_desc);
 292                 if (ACPI_SUCCESS(status)) {
 293                         out_values[i] = (u8)obj_desc->integer.value;
 294
 295                         /* Delete the return object */
 296
 297                         acpi_ut_remove_reference(obj_desc);
 298                         final_status = AE_OK;   /* At least one value is valid */
 299                         continue;
 300                 }
 301
 302                 out_values[i] = ACPI_UINT8_MAX;
 303                 if (status == AE_NOT_FOUND) {
 304                         continue;       /* Ignore if not found */
 305                 }
 306
 307                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 308                                   "Failed %s on Device %4.4s, %s\n",
 309                                   ACPI_CAST_PTR(char, method_names[i]),
 310                                   acpi_ut_get_node_name(device_node),
 311                                   acpi_format_exception(status)));
 312         }
 313
 314         return_ACPI_STATUS(final_status);
 315 }