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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 | #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->relative_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 | } |