1 /******************************************************************************
3 * Module Name: uteval - Object evaluation
5 *****************************************************************************/
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44 #include <contrib/dev/acpica/include/acpi.h>
45 #include <contrib/dev/acpica/include/accommon.h>
46 #include <contrib/dev/acpica/include/acnamesp.h>
49 #define _COMPONENT ACPI_UTILITIES
50 ACPI_MODULE_NAME ("uteval")
53 /*******************************************************************************
55 * FUNCTION: AcpiUtEvaluateObject
57 * PARAMETERS: PrefixNode - Starting node
58 * Path - Path to object from starting node
59 * ExpectedReturnTypes - Bitmap of allowed return types
60 * ReturnDesc - Where a return value is stored
64 * DESCRIPTION: Evaluates a namespace object and verifies the type of the
65 * return object. Common code that simplifies accessing objects
66 * that have required return objects of fixed types.
68 * NOTE: Internal function, no parameter validation
70 ******************************************************************************/
73 AcpiUtEvaluateObject (
74 ACPI_NAMESPACE_NODE *PrefixNode,
76 UINT32 ExpectedReturnBtypes,
77 ACPI_OPERAND_OBJECT **ReturnDesc)
79 ACPI_EVALUATE_INFO *Info;
84 ACPI_FUNCTION_TRACE (UtEvaluateObject);
87 /* Allocate the evaluation information block */
89 Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO));
92 return_ACPI_STATUS (AE_NO_MEMORY);
95 Info->PrefixNode = PrefixNode;
96 Info->RelativePathname = Path;
98 /* Evaluate the object/method */
100 Status = AcpiNsEvaluate (Info);
101 if (ACPI_FAILURE (Status))
103 if (Status == AE_NOT_FOUND)
105 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[%4.4s.%s] was not found\n",
106 AcpiUtGetNodeName (PrefixNode), Path));
110 ACPI_ERROR_METHOD ("Method execution failed",
111 PrefixNode, Path, Status);
117 /* Did we get a return object? */
119 if (!Info->ReturnObject)
121 if (ExpectedReturnBtypes)
123 ACPI_ERROR_METHOD ("No object was returned from",
124 PrefixNode, Path, AE_NOT_EXIST);
126 Status = AE_NOT_EXIST;
132 /* Map the return object type to the bitmapped type */
134 switch ((Info->ReturnObject)->Common.Type)
136 case ACPI_TYPE_INTEGER:
138 ReturnBtype = ACPI_BTYPE_INTEGER;
141 case ACPI_TYPE_BUFFER:
143 ReturnBtype = ACPI_BTYPE_BUFFER;
146 case ACPI_TYPE_STRING:
148 ReturnBtype = ACPI_BTYPE_STRING;
151 case ACPI_TYPE_PACKAGE:
153 ReturnBtype = ACPI_BTYPE_PACKAGE;
162 if ((AcpiGbl_EnableInterpreterSlack) &&
163 (!ExpectedReturnBtypes))
166 * We received a return object, but one was not expected. This can
167 * happen frequently if the "implicit return" feature is enabled.
168 * Just delete the return object and return AE_OK.
170 AcpiUtRemoveReference (Info->ReturnObject);
174 /* Is the return object one of the expected types? */
176 if (!(ExpectedReturnBtypes & ReturnBtype))
178 ACPI_ERROR_METHOD ("Return object type is incorrect",
179 PrefixNode, Path, AE_TYPE);
181 ACPI_ERROR ((AE_INFO,
182 "Type returned from %s was incorrect: %s, expected Btypes: 0x%X",
183 Path, AcpiUtGetObjectTypeName (Info->ReturnObject),
184 ExpectedReturnBtypes));
186 /* On error exit, we must delete the return object */
188 AcpiUtRemoveReference (Info->ReturnObject);
193 /* Object type is OK, return it */
195 *ReturnDesc = Info->ReturnObject;
199 return_ACPI_STATUS (Status);
203 /*******************************************************************************
205 * FUNCTION: AcpiUtEvaluateNumericObject
207 * PARAMETERS: ObjectName - Object name to be evaluated
208 * DeviceNode - Node for the device
209 * Value - Where the value is returned
213 * DESCRIPTION: Evaluates a numeric namespace object for a selected device
214 * and stores result in *Value.
216 * NOTE: Internal function, no parameter validation
218 ******************************************************************************/
221 AcpiUtEvaluateNumericObject (
222 const char *ObjectName,
223 ACPI_NAMESPACE_NODE *DeviceNode,
226 ACPI_OPERAND_OBJECT *ObjDesc;
230 ACPI_FUNCTION_TRACE (UtEvaluateNumericObject);
233 Status = AcpiUtEvaluateObject (DeviceNode, ObjectName,
234 ACPI_BTYPE_INTEGER, &ObjDesc);
235 if (ACPI_FAILURE (Status))
237 return_ACPI_STATUS (Status);
240 /* Get the returned Integer */
242 *Value = ObjDesc->Integer.Value;
244 /* On exit, we must delete the return object */
246 AcpiUtRemoveReference (ObjDesc);
247 return_ACPI_STATUS (Status);
251 /*******************************************************************************
253 * FUNCTION: AcpiUtExecute_STA
255 * PARAMETERS: DeviceNode - Node for the device
256 * Flags - Where the status flags are returned
260 * DESCRIPTION: Executes _STA for selected device and stores results in
261 * *Flags. If _STA does not exist, then the device is assumed
262 * to be present/functional/enabled (as per the ACPI spec).
264 * NOTE: Internal function, no parameter validation
266 ******************************************************************************/
270 ACPI_NAMESPACE_NODE *DeviceNode,
273 ACPI_OPERAND_OBJECT *ObjDesc;
277 ACPI_FUNCTION_TRACE (UtExecute_STA);
280 Status = AcpiUtEvaluateObject (DeviceNode, METHOD_NAME__STA,
281 ACPI_BTYPE_INTEGER, &ObjDesc);
282 if (ACPI_FAILURE (Status))
284 if (AE_NOT_FOUND == Status)
287 * if _STA does not exist, then (as per the ACPI specification),
288 * the returned flags will indicate that the device is present,
289 * functional, and enabled.
291 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
292 "_STA on %4.4s was not found, assuming device is present\n",
293 AcpiUtGetNodeName (DeviceNode)));
295 *Flags = ACPI_UINT32_MAX;
299 return_ACPI_STATUS (Status);
302 /* Extract the status flags */
304 *Flags = (UINT32) ObjDesc->Integer.Value;
306 /* On exit, we must delete the return object */
308 AcpiUtRemoveReference (ObjDesc);
309 return_ACPI_STATUS (Status);
313 /*******************************************************************************
315 * FUNCTION: AcpiUtExecutePowerMethods
317 * PARAMETERS: DeviceNode - Node for the device
318 * MethodNames - Array of power method names
319 * MethodCount - Number of methods to execute
320 * OutValues - Where the power method values are returned
322 * RETURN: Status, OutValues
324 * DESCRIPTION: Executes the specified power methods for the device and returns
327 * NOTE: Internal function, no parameter validation
329 ******************************************************************************/
332 AcpiUtExecutePowerMethods (
333 ACPI_NAMESPACE_NODE *DeviceNode,
334 const char **MethodNames,
338 ACPI_OPERAND_OBJECT *ObjDesc;
340 ACPI_STATUS FinalStatus = AE_NOT_FOUND;
344 ACPI_FUNCTION_TRACE (UtExecutePowerMethods);
347 for (i = 0; i < MethodCount; i++)
350 * Execute the power method (_SxD or _SxW). The only allowable
351 * return type is an Integer.
353 Status = AcpiUtEvaluateObject (DeviceNode,
354 ACPI_CAST_PTR (char, MethodNames[i]),
355 ACPI_BTYPE_INTEGER, &ObjDesc);
356 if (ACPI_SUCCESS (Status))
358 OutValues[i] = (UINT8) ObjDesc->Integer.Value;
360 /* Delete the return object */
362 AcpiUtRemoveReference (ObjDesc);
363 FinalStatus = AE_OK; /* At least one value is valid */
367 OutValues[i] = ACPI_UINT8_MAX;
368 if (Status == AE_NOT_FOUND)
370 continue; /* Ignore if not found */
373 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Failed %s on Device %4.4s, %s\n",
374 ACPI_CAST_PTR (char, MethodNames[i]),
375 AcpiUtGetNodeName (DeviceNode), AcpiFormatException (Status)));
378 return_ACPI_STATUS (FinalStatus);