1 /******************************************************************************
2 *
3 * Module Name: uteval - Object evaluation
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2013, 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 #define __UTEVAL_C__
45
46 #include "acpi.h"
47 #include "accommon.h"
48 #include "acnamesp.h"
49
50
51 #define _COMPONENT ACPI_UTILITIES
52 ACPI_MODULE_NAME ("uteval")
53
54
55 /*******************************************************************************
56 *
57 * FUNCTION: AcpiUtEvaluateObject
58 *
59 * PARAMETERS: PrefixNode - Starting node
60 * Path - Path to object from starting node
61 * ExpectedReturnTypes - Bitmap of allowed return types
62 * ReturnDesc - Where a return value is stored
63 *
64 * RETURN: Status
65 *
66 * DESCRIPTION: Evaluates a namespace object and verifies the type of the
67 * return object. Common code that simplifies accessing objects
68 * that have required return objects of fixed types.
69 *
70 * NOTE: Internal function, no parameter validation
71 *
72 ******************************************************************************/
73
74 ACPI_STATUS
75 AcpiUtEvaluateObject (
76 ACPI_NAMESPACE_NODE *PrefixNode,
77 char *Path,
78 UINT32 ExpectedReturnBtypes,
79 ACPI_OPERAND_OBJECT **ReturnDesc)
80 {
81 ACPI_EVALUATE_INFO *Info;
82 ACPI_STATUS Status;
83 UINT32 ReturnBtype;
84
85
86 ACPI_FUNCTION_TRACE (UtEvaluateObject);
87
88
89 /* Allocate the evaluation information block */
90
91 Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO));
92 if (!Info)
93 {
94 return_ACPI_STATUS (AE_NO_MEMORY);
95 }
96
97 Info->PrefixNode = PrefixNode;
98 Info->RelativePathname = Path;
99
100 /* Evaluate the object/method */
101
102 Status = AcpiNsEvaluate (Info);
103 if (ACPI_FAILURE (Status))
104 {
105 if (Status == AE_NOT_FOUND)
106 {
107 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[%4.4s.%s] was not found\n",
108 AcpiUtGetNodeName (PrefixNode), Path));
109 }
110 else
111 {
112 ACPI_ERROR_METHOD ("Method execution failed",
113 PrefixNode, Path, Status);
114 }
115
116 goto Cleanup;
117 }
118
119 /* Did we get a return object? */
120
121 if (!Info->ReturnObject)
122 {
123 if (ExpectedReturnBtypes)
124 {
125 ACPI_ERROR_METHOD ("No object was returned from",
126 PrefixNode, Path, AE_NOT_EXIST);
127
128 Status = AE_NOT_EXIST;
129 }
130
131 goto Cleanup;
132 }
133
134 /* Map the return object type to the bitmapped type */
135
136 switch ((Info->ReturnObject)->Common.Type)
137 {
138 case ACPI_TYPE_INTEGER:
139
140 ReturnBtype = ACPI_BTYPE_INTEGER;
141 break;
142
143 case ACPI_TYPE_BUFFER:
144
145 ReturnBtype = ACPI_BTYPE_BUFFER;
146 break;
147
148 case ACPI_TYPE_STRING:
149
150 ReturnBtype = ACPI_BTYPE_STRING;
151 break;
152
153 case ACPI_TYPE_PACKAGE:
154
155 ReturnBtype = ACPI_BTYPE_PACKAGE;
156 break;
157
158 default:
159
160 ReturnBtype = 0;
161 break;
162 }
163
164 if ((AcpiGbl_EnableInterpreterSlack) &&
165 (!ExpectedReturnBtypes))
166 {
167 /*
168 * We received a return object, but one was not expected. This can
169 * happen frequently if the "implicit return" feature is enabled.
170 * Just delete the return object and return AE_OK.
171 */
172 AcpiUtRemoveReference (Info->ReturnObject);
173 goto Cleanup;
174 }
175
176 /* Is the return object one of the expected types? */
177
178 if (!(ExpectedReturnBtypes & ReturnBtype))
179 {
180 ACPI_ERROR_METHOD ("Return object type is incorrect",
181 PrefixNode, Path, AE_TYPE);
182
183 ACPI_ERROR ((AE_INFO,
184 "Type returned from %s was incorrect: %s, expected Btypes: 0x%X",
185 Path, AcpiUtGetObjectTypeName (Info->ReturnObject),
186 ExpectedReturnBtypes));
187
188 /* On error exit, we must delete the return object */
189
190 AcpiUtRemoveReference (Info->ReturnObject);
191 Status = AE_TYPE;
192 goto Cleanup;
193 }
194
195 /* Object type is OK, return it */
196
197 *ReturnDesc = Info->ReturnObject;
198
199 Cleanup:
200 ACPI_FREE (Info);
201 return_ACPI_STATUS (Status);
202 }
203
204
205 /*******************************************************************************
206 *
207 * FUNCTION: AcpiUtEvaluateNumericObject
208 *
209 * PARAMETERS: ObjectName - Object name to be evaluated
210 * DeviceNode - Node for the device
211 * Value - Where the value is returned
212 *
213 * RETURN: Status
214 *
215 * DESCRIPTION: Evaluates a numeric namespace object for a selected device
216 * and stores result in *Value.
217 *
218 * NOTE: Internal function, no parameter validation
219 *
220 ******************************************************************************/
221
222 ACPI_STATUS
223 AcpiUtEvaluateNumericObject (
224 char *ObjectName,
225 ACPI_NAMESPACE_NODE *DeviceNode,
226 UINT64 *Value)
227 {
228 ACPI_OPERAND_OBJECT *ObjDesc;
229 ACPI_STATUS Status;
230
231
232 ACPI_FUNCTION_TRACE (UtEvaluateNumericObject);
233
234
235 Status = AcpiUtEvaluateObject (DeviceNode, ObjectName,
236 ACPI_BTYPE_INTEGER, &ObjDesc);
237 if (ACPI_FAILURE (Status))
238 {
239 return_ACPI_STATUS (Status);
240 }
241
242 /* Get the returned Integer */
243
244 *Value = ObjDesc->Integer.Value;
245
246 /* On exit, we must delete the return object */
247
248 AcpiUtRemoveReference (ObjDesc);
249 return_ACPI_STATUS (Status);
250 }
251
252
253 /*******************************************************************************
254 *
255 * FUNCTION: AcpiUtExecute_STA
256 *
257 * PARAMETERS: DeviceNode - Node for the device
258 * Flags - Where the status flags are returned
259 *
260 * RETURN: Status
261 *
262 * DESCRIPTION: Executes _STA for selected device and stores results in
263 * *Flags. If _STA does not exist, then the device is assumed
264 * to be present/functional/enabled (as per the ACPI spec).
265 *
266 * NOTE: Internal function, no parameter validation
267 *
268 ******************************************************************************/
269
270 ACPI_STATUS
271 AcpiUtExecute_STA (
272 ACPI_NAMESPACE_NODE *DeviceNode,
273 UINT32 *Flags)
274 {
275 ACPI_OPERAND_OBJECT *ObjDesc;
276 ACPI_STATUS Status;
277
278
279 ACPI_FUNCTION_TRACE (UtExecute_STA);
280
281
282 Status = AcpiUtEvaluateObject (DeviceNode, METHOD_NAME__STA,
283 ACPI_BTYPE_INTEGER, &ObjDesc);
284 if (ACPI_FAILURE (Status))
285 {
286 if (AE_NOT_FOUND == Status)
287 {
288 /*
289 * if _STA does not exist, then (as per the ACPI specification),
290 * the returned flags will indicate that the device is present,
291 * functional, and enabled.
292 */
293 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
294 "_STA on %4.4s was not found, assuming device is present\n",
295 AcpiUtGetNodeName (DeviceNode)));
296
297 *Flags = ACPI_UINT32_MAX;
298 Status = AE_OK;
299 }
300
301 return_ACPI_STATUS (Status);
302 }
303
304 /* Extract the status flags */
305
306 *Flags = (UINT32) ObjDesc->Integer.Value;
307
308 /* On exit, we must delete the return object */
309
310 AcpiUtRemoveReference (ObjDesc);
311 return_ACPI_STATUS (Status);
312 }
313
314
315 /*******************************************************************************
316 *
317 * FUNCTION: AcpiUtExecutePowerMethods
318 *
319 * PARAMETERS: DeviceNode - Node for the device
320 * MethodNames - Array of power method names
321 * MethodCount - Number of methods to execute
322 * OutValues - Where the power method values are returned
323 *
324 * RETURN: Status, OutValues
325 *
326 * DESCRIPTION: Executes the specified power methods for the device and returns
327 * the result(s).
328 *
329 * NOTE: Internal function, no parameter validation
330 *
331 ******************************************************************************/
332
333 ACPI_STATUS
334 AcpiUtExecutePowerMethods (
335 ACPI_NAMESPACE_NODE *DeviceNode,
336 const char **MethodNames,
337 UINT8 MethodCount,
338 UINT8 *OutValues)
339 {
340 ACPI_OPERAND_OBJECT *ObjDesc;
341 ACPI_STATUS Status;
342 ACPI_STATUS FinalStatus = AE_NOT_FOUND;
343 UINT32 i;
344
345
346 ACPI_FUNCTION_TRACE (UtExecutePowerMethods);
347
348
349 for (i = 0; i < MethodCount; i++)
350 {
351 /*
352 * Execute the power method (_SxD or _SxW). The only allowable
353 * return type is an Integer.
354 */
355 Status = AcpiUtEvaluateObject (DeviceNode,
356 ACPI_CAST_PTR (char, MethodNames[i]),
357 ACPI_BTYPE_INTEGER, &ObjDesc);
358 if (ACPI_SUCCESS (Status))
359 {
360 OutValues[i] = (UINT8) ObjDesc->Integer.Value;
361
362 /* Delete the return object */
363
364 AcpiUtRemoveReference (ObjDesc);
365 FinalStatus = AE_OK; /* At least one value is valid */
366 continue;
367 }
368
369 OutValues[i] = ACPI_UINT8_MAX;
370 if (Status == AE_NOT_FOUND)
371 {
372 continue; /* Ignore if not found */
373 }
374
375 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Failed %s on Device %4.4s, %s\n",
376 ACPI_CAST_PTR (char, MethodNames[i]),
377 AcpiUtGetNodeName (DeviceNode), AcpiFormatException (Status)));
378 }
379
380 return_ACPI_STATUS (FinalStatus);
381 }