1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 2 /****************************************************************************** 3 * 4 * Module Name: uteval - Object evaluation 5 * 6 * Copyright (C) 2000 - 2021, 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 } 316