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1da177e4 LT |
1 | /******************************************************************************* |
2 | * | |
3 | * Module Name: nsxfeval - Public interfaces to the ACPI subsystem | |
4 | * ACPI Object evaluation interfaces | |
5 | * | |
6 | ******************************************************************************/ | |
7 | ||
8 | /* | |
75a44ce0 | 9 | * Copyright (C) 2000 - 2008, Intel Corp. |
1da177e4 LT |
10 | * All rights reserved. |
11 | * | |
12 | * Redistribution and use in source and binary forms, with or without | |
13 | * modification, are permitted provided that the following conditions | |
14 | * are met: | |
15 | * 1. Redistributions of source code must retain the above copyright | |
16 | * notice, this list of conditions, and the following disclaimer, | |
17 | * without modification. | |
18 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
19 | * substantially similar to the "NO WARRANTY" disclaimer below | |
20 | * ("Disclaimer") and any redistribution must be conditioned upon | |
21 | * including a substantially similar Disclaimer requirement for further | |
22 | * binary redistribution. | |
23 | * 3. Neither the names of the above-listed copyright holders nor the names | |
24 | * of any contributors may be used to endorse or promote products derived | |
25 | * from this software without specific prior written permission. | |
26 | * | |
27 | * Alternatively, this software may be distributed under the terms of the | |
28 | * GNU General Public License ("GPL") version 2 as published by the Free | |
29 | * Software Foundation. | |
30 | * | |
31 | * NO WARRANTY | |
32 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
33 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
34 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
35 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
36 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
37 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
38 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
39 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
40 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
41 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
42 | * POSSIBILITY OF SUCH DAMAGES. | |
43 | */ | |
44 | ||
1da177e4 | 45 | #include <acpi/acpi.h> |
e2f7a777 LB |
46 | #include "accommon.h" |
47 | #include "acnamesp.h" | |
48 | #include "acinterp.h" | |
1da177e4 | 49 | |
1da177e4 | 50 | #define _COMPONENT ACPI_NAMESPACE |
4be44fcd | 51 | ACPI_MODULE_NAME("nsxfeval") |
bbc24134 LM |
52 | |
53 | /* Local prototypes */ | |
54 | static void acpi_ns_resolve_references(struct acpi_evaluate_info *info); | |
55 | ||
1da177e4 LT |
56 | /******************************************************************************* |
57 | * | |
58 | * FUNCTION: acpi_evaluate_object_typed | |
59 | * | |
60 | * PARAMETERS: Handle - Object handle (optional) | |
44f6c012 RM |
61 | * Pathname - Object pathname (optional) |
62 | * external_params - List of parameters to pass to method, | |
1da177e4 LT |
63 | * terminated by NULL. May be NULL |
64 | * if no parameters are being passed. | |
44f6c012 | 65 | * return_buffer - Where to put method's return value (if |
1da177e4 LT |
66 | * any). If NULL, no value is returned. |
67 | * return_type - Expected type of return object | |
68 | * | |
69 | * RETURN: Status | |
70 | * | |
71 | * DESCRIPTION: Find and evaluate the given object, passing the given | |
72 | * parameters if necessary. One of "Handle" or "Pathname" must | |
73 | * be valid (non-null) | |
74 | * | |
75 | ******************************************************************************/ | |
bbc24134 | 76 | |
1da177e4 | 77 | acpi_status |
4be44fcd LB |
78 | acpi_evaluate_object_typed(acpi_handle handle, |
79 | acpi_string pathname, | |
fd350943 LB |
80 | struct acpi_object_list *external_params, |
81 | struct acpi_buffer *return_buffer, | |
4be44fcd | 82 | acpi_object_type return_type) |
1da177e4 | 83 | { |
4be44fcd LB |
84 | acpi_status status; |
85 | u8 must_free = FALSE; | |
1da177e4 | 86 | |
b229cf92 | 87 | ACPI_FUNCTION_TRACE(acpi_evaluate_object_typed); |
1da177e4 LT |
88 | |
89 | /* Return buffer must be valid */ | |
90 | ||
91 | if (!return_buffer) { | |
4be44fcd | 92 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
93 | } |
94 | ||
95 | if (return_buffer->length == ACPI_ALLOCATE_BUFFER) { | |
96 | must_free = TRUE; | |
97 | } | |
98 | ||
99 | /* Evaluate the object */ | |
100 | ||
4be44fcd LB |
101 | status = |
102 | acpi_evaluate_object(handle, pathname, external_params, | |
103 | return_buffer); | |
104 | if (ACPI_FAILURE(status)) { | |
105 | return_ACPI_STATUS(status); | |
1da177e4 LT |
106 | } |
107 | ||
108 | /* Type ANY means "don't care" */ | |
109 | ||
110 | if (return_type == ACPI_TYPE_ANY) { | |
4be44fcd | 111 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
112 | } |
113 | ||
114 | if (return_buffer->length == 0) { | |
52fc0b02 | 115 | |
1da177e4 LT |
116 | /* Error because caller specifically asked for a return value */ |
117 | ||
b8e4d893 | 118 | ACPI_ERROR((AE_INFO, "No return value")); |
4be44fcd | 119 | return_ACPI_STATUS(AE_NULL_OBJECT); |
1da177e4 LT |
120 | } |
121 | ||
122 | /* Examine the object type returned from evaluate_object */ | |
123 | ||
4be44fcd LB |
124 | if (((union acpi_object *)return_buffer->pointer)->type == return_type) { |
125 | return_ACPI_STATUS(AE_OK); | |
1da177e4 LT |
126 | } |
127 | ||
128 | /* Return object type does not match requested type */ | |
129 | ||
b8e4d893 BM |
130 | ACPI_ERROR((AE_INFO, |
131 | "Incorrect return type [%s] requested [%s]", | |
132 | acpi_ut_get_type_name(((union acpi_object *)return_buffer-> | |
133 | pointer)->type), | |
134 | acpi_ut_get_type_name(return_type))); | |
1da177e4 LT |
135 | |
136 | if (must_free) { | |
52fc0b02 | 137 | |
1da177e4 LT |
138 | /* Caller used ACPI_ALLOCATE_BUFFER, free the return buffer */ |
139 | ||
02438d87 | 140 | ACPI_FREE(return_buffer->pointer); |
1da177e4 LT |
141 | return_buffer->pointer = NULL; |
142 | } | |
143 | ||
144 | return_buffer->length = 0; | |
4be44fcd | 145 | return_ACPI_STATUS(AE_TYPE); |
1da177e4 | 146 | } |
8313524a BM |
147 | |
148 | ACPI_EXPORT_SYMBOL(acpi_evaluate_object_typed) | |
2c03d07a | 149 | |
1da177e4 LT |
150 | /******************************************************************************* |
151 | * | |
152 | * FUNCTION: acpi_evaluate_object | |
153 | * | |
154 | * PARAMETERS: Handle - Object handle (optional) | |
155 | * Pathname - Object pathname (optional) | |
156 | * external_params - List of parameters to pass to method, | |
157 | * terminated by NULL. May be NULL | |
158 | * if no parameters are being passed. | |
159 | * return_buffer - Where to put method's return value (if | |
160 | * any). If NULL, no value is returned. | |
161 | * | |
162 | * RETURN: Status | |
163 | * | |
164 | * DESCRIPTION: Find and evaluate the given object, passing the given | |
165 | * parameters if necessary. One of "Handle" or "Pathname" must | |
166 | * be valid (non-null) | |
167 | * | |
168 | ******************************************************************************/ | |
1da177e4 | 169 | acpi_status |
4be44fcd LB |
170 | acpi_evaluate_object(acpi_handle handle, |
171 | acpi_string pathname, | |
172 | struct acpi_object_list *external_params, | |
173 | struct acpi_buffer *return_buffer) | |
1da177e4 | 174 | { |
4be44fcd | 175 | acpi_status status; |
4119532c | 176 | struct acpi_evaluate_info *info; |
4be44fcd LB |
177 | acpi_size buffer_space_needed; |
178 | u32 i; | |
1da177e4 | 179 | |
b229cf92 | 180 | ACPI_FUNCTION_TRACE(acpi_evaluate_object); |
1da177e4 | 181 | |
4119532c BM |
182 | /* Allocate and initialize the evaluation information block */ |
183 | ||
184 | info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); | |
185 | if (!info) { | |
186 | return_ACPI_STATUS(AE_NO_MEMORY); | |
187 | } | |
188 | ||
189 | info->pathname = pathname; | |
4119532c BM |
190 | |
191 | /* Convert and validate the device handle */ | |
192 | ||
193 | info->prefix_node = acpi_ns_map_handle_to_node(handle); | |
194 | if (!info->prefix_node) { | |
195 | status = AE_BAD_PARAMETER; | |
196 | goto cleanup; | |
197 | } | |
1da177e4 LT |
198 | |
199 | /* | |
4119532c BM |
200 | * If there are parameters to be passed to a control method, the external |
201 | * objects must all be converted to internal objects | |
1da177e4 LT |
202 | */ |
203 | if (external_params && external_params->count) { | |
204 | /* | |
205 | * Allocate a new parameter block for the internal objects | |
206 | * Add 1 to count to allow for null terminated internal list | |
207 | */ | |
4119532c BM |
208 | info->parameters = ACPI_ALLOCATE_ZEROED(((acpi_size) |
209 | external_params-> | |
210 | count + | |
211 | 1) * sizeof(void *)); | |
212 | if (!info->parameters) { | |
213 | status = AE_NO_MEMORY; | |
214 | goto cleanup; | |
1da177e4 LT |
215 | } |
216 | ||
4119532c BM |
217 | /* Convert each external object in the list to an internal object */ |
218 | ||
1da177e4 | 219 | for (i = 0; i < external_params->count; i++) { |
4be44fcd LB |
220 | status = |
221 | acpi_ut_copy_eobject_to_iobject(&external_params-> | |
222 | pointer[i], | |
4119532c | 223 | &info-> |
4be44fcd LB |
224 | parameters[i]); |
225 | if (ACPI_FAILURE(status)) { | |
4119532c | 226 | goto cleanup; |
1da177e4 LT |
227 | } |
228 | } | |
4119532c | 229 | info->parameters[external_params->count] = NULL; |
1da177e4 LT |
230 | } |
231 | ||
1da177e4 LT |
232 | /* |
233 | * Three major cases: | |
234 | * 1) Fully qualified pathname | |
235 | * 2) No handle, not fully qualified pathname (error) | |
236 | * 3) Valid handle | |
237 | */ | |
4be44fcd | 238 | if ((pathname) && (acpi_ns_valid_root_prefix(pathname[0]))) { |
52fc0b02 BM |
239 | |
240 | /* The path is fully qualified, just evaluate by name */ | |
241 | ||
4119532c BM |
242 | info->prefix_node = NULL; |
243 | status = acpi_ns_evaluate(info); | |
4be44fcd | 244 | } else if (!handle) { |
1da177e4 | 245 | /* |
4119532c BM |
246 | * A handle is optional iff a fully qualified pathname is specified. |
247 | * Since we've already handled fully qualified names above, this is | |
248 | * an error | |
1da177e4 LT |
249 | */ |
250 | if (!pathname) { | |
52fc0b02 BM |
251 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
252 | "Both Handle and Pathname are NULL")); | |
4be44fcd | 253 | } else { |
52fc0b02 BM |
254 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
255 | "Null Handle with relative pathname [%s]", | |
256 | pathname)); | |
1da177e4 LT |
257 | } |
258 | ||
259 | status = AE_BAD_PARAMETER; | |
4be44fcd | 260 | } else { |
4119532c | 261 | /* We have a namespace a node and a possible relative path */ |
52fc0b02 | 262 | |
4119532c | 263 | status = acpi_ns_evaluate(info); |
1da177e4 LT |
264 | } |
265 | ||
1da177e4 LT |
266 | /* |
267 | * If we are expecting a return value, and all went well above, | |
268 | * copy the return value to an external object. | |
269 | */ | |
270 | if (return_buffer) { | |
4119532c | 271 | if (!info->return_object) { |
1da177e4 | 272 | return_buffer->length = 0; |
4be44fcd | 273 | } else { |
4119532c | 274 | if (ACPI_GET_DESCRIPTOR_TYPE(info->return_object) == |
4be44fcd | 275 | ACPI_DESC_TYPE_NAMED) { |
1da177e4 LT |
276 | /* |
277 | * If we received a NS Node as a return object, this means that | |
278 | * the object we are evaluating has nothing interesting to | |
279 | * return (such as a mutex, etc.) We return an error because | |
280 | * these types are essentially unsupported by this interface. | |
281 | * We don't check up front because this makes it easier to add | |
282 | * support for various types at a later date if necessary. | |
283 | */ | |
284 | status = AE_TYPE; | |
4119532c | 285 | info->return_object = NULL; /* No need to delete a NS Node */ |
1da177e4 LT |
286 | return_buffer->length = 0; |
287 | } | |
288 | ||
4be44fcd | 289 | if (ACPI_SUCCESS(status)) { |
4119532c | 290 | |
bbc24134 LM |
291 | /* Dereference Index and ref_of references */ |
292 | ||
293 | acpi_ns_resolve_references(info); | |
294 | ||
4119532c BM |
295 | /* Get the size of the returned object */ |
296 | ||
4be44fcd | 297 | status = |
4119532c | 298 | acpi_ut_get_object_size(info->return_object, |
4be44fcd LB |
299 | &buffer_space_needed); |
300 | if (ACPI_SUCCESS(status)) { | |
52fc0b02 | 301 | |
1da177e4 LT |
302 | /* Validate/Allocate/Clear caller buffer */ |
303 | ||
4be44fcd LB |
304 | status = |
305 | acpi_ut_initialize_buffer | |
306 | (return_buffer, | |
307 | buffer_space_needed); | |
308 | if (ACPI_FAILURE(status)) { | |
1da177e4 | 309 | /* |
52fc0b02 BM |
310 | * Caller's buffer is too small or a new one can't |
311 | * be allocated | |
1da177e4 | 312 | */ |
4be44fcd LB |
313 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
314 | "Needed buffer size %X, %s\n", | |
315 | (u32) | |
316 | buffer_space_needed, | |
317 | acpi_format_exception | |
318 | (status))); | |
319 | } else { | |
52fc0b02 BM |
320 | /* We have enough space for the object, build it */ |
321 | ||
4be44fcd LB |
322 | status = |
323 | acpi_ut_copy_iobject_to_eobject | |
4119532c | 324 | (info->return_object, |
4be44fcd | 325 | return_buffer); |
1da177e4 LT |
326 | } |
327 | } | |
328 | } | |
329 | } | |
330 | } | |
331 | ||
4119532c | 332 | if (info->return_object) { |
1da177e4 | 333 | /* |
4119532c BM |
334 | * Delete the internal return object. NOTE: Interpreter must be |
335 | * locked to avoid race condition. | |
1da177e4 | 336 | */ |
4d2acd9e | 337 | acpi_ex_enter_interpreter(); |
4119532c | 338 | |
4d2acd9e | 339 | /* Remove one reference on the return object (should delete it) */ |
4119532c | 340 | |
4d2acd9e LB |
341 | acpi_ut_remove_reference(info->return_object); |
342 | acpi_ex_exit_interpreter(); | |
1da177e4 LT |
343 | } |
344 | ||
4119532c BM |
345 | cleanup: |
346 | ||
52fc0b02 BM |
347 | /* Free the input parameter list (if we created one) */ |
348 | ||
4119532c | 349 | if (info->parameters) { |
52fc0b02 | 350 | |
1da177e4 LT |
351 | /* Free the allocated parameter block */ |
352 | ||
4119532c | 353 | acpi_ut_delete_internal_object_list(info->parameters); |
1da177e4 LT |
354 | } |
355 | ||
4119532c | 356 | ACPI_FREE(info); |
4be44fcd | 357 | return_ACPI_STATUS(status); |
1da177e4 | 358 | } |
1da177e4 | 359 | |
8313524a | 360 | ACPI_EXPORT_SYMBOL(acpi_evaluate_object) |
1da177e4 | 361 | |
bbc24134 LM |
362 | /******************************************************************************* |
363 | * | |
364 | * FUNCTION: acpi_ns_resolve_references | |
365 | * | |
366 | * PARAMETERS: Info - Evaluation info block | |
367 | * | |
368 | * RETURN: Info->return_object is replaced with the dereferenced object | |
369 | * | |
370 | * DESCRIPTION: Dereference certain reference objects. Called before an | |
371 | * internal return object is converted to an external union acpi_object. | |
372 | * | |
373 | * Performs an automatic dereference of Index and ref_of reference objects. | |
374 | * These reference objects are not supported by the union acpi_object, so this is a | |
375 | * last resort effort to return something useful. Also, provides compatibility | |
376 | * with other ACPI implementations. | |
377 | * | |
378 | * NOTE: does not handle references within returned package objects or nested | |
379 | * references, but this support could be added later if found to be necessary. | |
380 | * | |
381 | ******************************************************************************/ | |
382 | static void acpi_ns_resolve_references(struct acpi_evaluate_info *info) | |
383 | { | |
384 | union acpi_operand_object *obj_desc = NULL; | |
385 | struct acpi_namespace_node *node; | |
386 | ||
387 | /* We are interested in reference objects only */ | |
388 | ||
3371c19c | 389 | if ((info->return_object)->common.type != ACPI_TYPE_LOCAL_REFERENCE) { |
bbc24134 LM |
390 | return; |
391 | } | |
392 | ||
393 | /* | |
394 | * Two types of references are supported - those created by Index and | |
395 | * ref_of operators. A name reference (AML_NAMEPATH_OP) can be converted | |
396 | * to an union acpi_object, so it is not dereferenced here. A ddb_handle | |
397 | * (AML_LOAD_OP) cannot be dereferenced, nor can it be converted to | |
398 | * an union acpi_object. | |
399 | */ | |
1044f1f6 BM |
400 | switch (info->return_object->reference.class) { |
401 | case ACPI_REFCLASS_INDEX: | |
bbc24134 LM |
402 | |
403 | obj_desc = *(info->return_object->reference.where); | |
404 | break; | |
405 | ||
1044f1f6 | 406 | case ACPI_REFCLASS_REFOF: |
bbc24134 LM |
407 | |
408 | node = info->return_object->reference.object; | |
409 | if (node) { | |
410 | obj_desc = node->object; | |
411 | } | |
412 | break; | |
413 | ||
414 | default: | |
415 | return; | |
416 | } | |
417 | ||
418 | /* Replace the existing reference object */ | |
419 | ||
420 | if (obj_desc) { | |
421 | acpi_ut_add_reference(obj_desc); | |
422 | acpi_ut_remove_reference(info->return_object); | |
423 | info->return_object = obj_desc; | |
424 | } | |
425 | ||
426 | return; | |
427 | } | |
428 | ||
1da177e4 LT |
429 | /******************************************************************************* |
430 | * | |
431 | * FUNCTION: acpi_walk_namespace | |
432 | * | |
433 | * PARAMETERS: Type - acpi_object_type to search for | |
434 | * start_object - Handle in namespace where search begins | |
435 | * max_depth - Depth to which search is to reach | |
436 | * user_function - Called when an object of "Type" is found | |
437 | * Context - Passed to user function | |
438 | * return_value - Location where return value of | |
439 | * user_function is put if terminated early | |
440 | * | |
441 | * RETURNS Return value from the user_function if terminated early. | |
442 | * Otherwise, returns NULL. | |
443 | * | |
444 | * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, | |
445 | * starting (and ending) at the object specified by start_handle. | |
446 | * The user_function is called whenever an object that matches | |
447 | * the type parameter is found. If the user function returns | |
448 | * a non-zero value, the search is terminated immediately and this | |
449 | * value is returned to the caller. | |
450 | * | |
451 | * The point of this procedure is to provide a generic namespace | |
452 | * walk routine that can be called from multiple places to | |
453 | * provide multiple services; the User Function can be tailored | |
454 | * to each task, whether it is a print function, a compare | |
455 | * function, etc. | |
456 | * | |
457 | ******************************************************************************/ | |
bbc24134 | 458 | |
1da177e4 | 459 | acpi_status |
4be44fcd LB |
460 | acpi_walk_namespace(acpi_object_type type, |
461 | acpi_handle start_object, | |
462 | u32 max_depth, | |
463 | acpi_walk_callback user_function, | |
464 | void *context, void **return_value) | |
1da177e4 | 465 | { |
4be44fcd | 466 | acpi_status status; |
1da177e4 | 467 | |
b229cf92 | 468 | ACPI_FUNCTION_TRACE(acpi_walk_namespace); |
1da177e4 LT |
469 | |
470 | /* Parameter validation */ | |
471 | ||
96db255c | 472 | if ((type > ACPI_TYPE_LOCAL_MAX) || (!max_depth) || (!user_function)) { |
4be44fcd | 473 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
474 | } |
475 | ||
476 | /* | |
8a335a23 BM |
477 | * Need to acquire the namespace reader lock to prevent interference |
478 | * with any concurrent table unloads (which causes the deletion of | |
479 | * namespace objects). We cannot allow the deletion of a namespace node | |
480 | * while the user function is using it. The exception to this are the | |
481 | * nodes created and deleted during control method execution -- these | |
482 | * nodes are marked as temporary nodes and are ignored by the namespace | |
483 | * walk. Thus, control methods can be executed while holding the | |
484 | * namespace deletion lock (and the user function can execute control | |
485 | * methods.) | |
486 | */ | |
487 | status = acpi_ut_acquire_read_lock(&acpi_gbl_namespace_rw_lock); | |
488 | if (ACPI_FAILURE(status)) { | |
489 | return status; | |
490 | } | |
491 | ||
492 | /* | |
493 | * Lock the namespace around the walk. The namespace will be | |
494 | * unlocked/locked around each call to the user function - since the user | |
495 | * function must be allowed to make ACPICA calls itself (for example, it | |
496 | * will typically execute control methods during device enumeration.) | |
1da177e4 | 497 | */ |
4be44fcd LB |
498 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
499 | if (ACPI_FAILURE(status)) { | |
8a335a23 | 500 | goto unlock_and_exit; |
1da177e4 LT |
501 | } |
502 | ||
4be44fcd | 503 | status = acpi_ns_walk_namespace(type, start_object, max_depth, |
8a335a23 BM |
504 | ACPI_NS_WALK_UNLOCK, user_function, |
505 | context, return_value); | |
1da177e4 | 506 | |
4be44fcd | 507 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
8a335a23 BM |
508 | |
509 | unlock_and_exit: | |
510 | (void)acpi_ut_release_read_lock(&acpi_gbl_namespace_rw_lock); | |
4be44fcd | 511 | return_ACPI_STATUS(status); |
1da177e4 | 512 | } |
1da177e4 | 513 | |
8313524a | 514 | ACPI_EXPORT_SYMBOL(acpi_walk_namespace) |
1da177e4 LT |
515 | |
516 | /******************************************************************************* | |
517 | * | |
518 | * FUNCTION: acpi_ns_get_device_callback | |
519 | * | |
520 | * PARAMETERS: Callback from acpi_get_device | |
521 | * | |
522 | * RETURN: Status | |
523 | * | |
524 | * DESCRIPTION: Takes callbacks from walk_namespace and filters out all non- | |
525 | * present devices, or if they specified a HID, it filters based | |
526 | * on that. | |
527 | * | |
528 | ******************************************************************************/ | |
1da177e4 | 529 | static acpi_status |
4be44fcd LB |
530 | acpi_ns_get_device_callback(acpi_handle obj_handle, |
531 | u32 nesting_level, | |
532 | void *context, void **return_value) | |
1da177e4 | 533 | { |
4be44fcd LB |
534 | struct acpi_get_devices_info *info = context; |
535 | acpi_status status; | |
536 | struct acpi_namespace_node *node; | |
537 | u32 flags; | |
15b8dd53 BM |
538 | struct acpica_device_id *hid; |
539 | struct acpica_device_id_list *cid; | |
67a119f9 | 540 | u32 i; |
15b8dd53 BM |
541 | u8 found; |
542 | int no_match; | |
1da177e4 | 543 | |
4be44fcd LB |
544 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
545 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
546 | return (status); |
547 | } | |
548 | ||
4be44fcd LB |
549 | node = acpi_ns_map_handle_to_node(obj_handle); |
550 | status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
551 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
552 | return (status); |
553 | } | |
554 | ||
555 | if (!node) { | |
556 | return (AE_BAD_PARAMETER); | |
557 | } | |
558 | ||
559 | /* Run _STA to determine if device is present */ | |
560 | ||
4be44fcd LB |
561 | status = acpi_ut_execute_STA(node, &flags); |
562 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
563 | return (AE_CTRL_DEPTH); |
564 | } | |
565 | ||
549f4604 BM |
566 | if (!(flags & ACPI_STA_DEVICE_PRESENT) && |
567 | !(flags & ACPI_STA_DEVICE_FUNCTIONING)) { | |
568 | /* | |
569 | * Don't examine the children of the device only when the | |
570 | * device is neither present nor functional. See ACPI spec, | |
571 | * description of _STA for more information. | |
572 | */ | |
1da177e4 LT |
573 | return (AE_CTRL_DEPTH); |
574 | } | |
575 | ||
576 | /* Filter based on device HID & CID */ | |
577 | ||
578 | if (info->hid != NULL) { | |
4be44fcd | 579 | status = acpi_ut_execute_HID(node, &hid); |
1da177e4 LT |
580 | if (status == AE_NOT_FOUND) { |
581 | return (AE_OK); | |
4be44fcd | 582 | } else if (ACPI_FAILURE(status)) { |
1da177e4 LT |
583 | return (AE_CTRL_DEPTH); |
584 | } | |
585 | ||
15b8dd53 BM |
586 | no_match = ACPI_STRCMP(hid->string, info->hid); |
587 | ACPI_FREE(hid); | |
1da177e4 | 588 | |
15b8dd53 BM |
589 | if (no_match) { |
590 | /* | |
591 | * HID does not match, attempt match within the | |
592 | * list of Compatible IDs (CIDs) | |
593 | */ | |
4be44fcd | 594 | status = acpi_ut_execute_CID(node, &cid); |
1da177e4 LT |
595 | if (status == AE_NOT_FOUND) { |
596 | return (AE_OK); | |
4be44fcd | 597 | } else if (ACPI_FAILURE(status)) { |
1da177e4 LT |
598 | return (AE_CTRL_DEPTH); |
599 | } | |
600 | ||
601 | /* Walk the CID list */ | |
602 | ||
02f8a858 | 603 | found = 0; |
1da177e4 | 604 | for (i = 0; i < cid->count; i++) { |
15b8dd53 BM |
605 | if (ACPI_STRCMP(cid->ids[i].string, info->hid) |
606 | == 0) { | |
02f8a858 AP |
607 | found = 1; |
608 | break; | |
1da177e4 LT |
609 | } |
610 | } | |
8313524a | 611 | ACPI_FREE(cid); |
02f8a858 AP |
612 | if (!found) |
613 | return (AE_OK); | |
1da177e4 LT |
614 | } |
615 | } | |
616 | ||
4be44fcd LB |
617 | status = info->user_function(obj_handle, nesting_level, info->context, |
618 | return_value); | |
1da177e4 LT |
619 | return (status); |
620 | } | |
621 | ||
1da177e4 LT |
622 | /******************************************************************************* |
623 | * | |
624 | * FUNCTION: acpi_get_devices | |
625 | * | |
626 | * PARAMETERS: HID - HID to search for. Can be NULL. | |
627 | * user_function - Called when a matching object is found | |
628 | * Context - Passed to user function | |
629 | * return_value - Location where return value of | |
630 | * user_function is put if terminated early | |
631 | * | |
632 | * RETURNS Return value from the user_function if terminated early. | |
633 | * Otherwise, returns NULL. | |
634 | * | |
635 | * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, | |
636 | * starting (and ending) at the object specified by start_handle. | |
637 | * The user_function is called whenever an object of type | |
638 | * Device is found. If the user function returns | |
639 | * a non-zero value, the search is terminated immediately and this | |
640 | * value is returned to the caller. | |
641 | * | |
642 | * This is a wrapper for walk_namespace, but the callback performs | |
549f4604 | 643 | * additional filtering. Please see acpi_ns_get_device_callback. |
1da177e4 LT |
644 | * |
645 | ******************************************************************************/ | |
646 | ||
647 | acpi_status | |
70b30fb1 | 648 | acpi_get_devices(const char *HID, |
4be44fcd LB |
649 | acpi_walk_callback user_function, |
650 | void *context, void **return_value) | |
1da177e4 | 651 | { |
4be44fcd LB |
652 | acpi_status status; |
653 | struct acpi_get_devices_info info; | |
1da177e4 | 654 | |
b229cf92 | 655 | ACPI_FUNCTION_TRACE(acpi_get_devices); |
1da177e4 LT |
656 | |
657 | /* Parameter validation */ | |
658 | ||
659 | if (!user_function) { | |
4be44fcd | 660 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
661 | } |
662 | ||
663 | /* | |
664 | * We're going to call their callback from OUR callback, so we need | |
665 | * to know what it is, and their context parameter. | |
666 | */ | |
52fc0b02 | 667 | info.hid = HID; |
4be44fcd | 668 | info.context = context; |
1da177e4 | 669 | info.user_function = user_function; |
1da177e4 LT |
670 | |
671 | /* | |
672 | * Lock the namespace around the walk. | |
673 | * The namespace will be unlocked/locked around each call | |
674 | * to the user function - since this function | |
675 | * must be allowed to make Acpi calls itself. | |
676 | */ | |
4be44fcd LB |
677 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
678 | if (ACPI_FAILURE(status)) { | |
679 | return_ACPI_STATUS(status); | |
1da177e4 LT |
680 | } |
681 | ||
52fc0b02 BM |
682 | status = acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
683 | ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK, | |
4be44fcd LB |
684 | acpi_ns_get_device_callback, &info, |
685 | return_value); | |
1da177e4 | 686 | |
4be44fcd LB |
687 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
688 | return_ACPI_STATUS(status); | |
1da177e4 | 689 | } |
1da177e4 | 690 | |
8313524a | 691 | ACPI_EXPORT_SYMBOL(acpi_get_devices) |
1da177e4 LT |
692 | |
693 | /******************************************************************************* | |
694 | * | |
695 | * FUNCTION: acpi_attach_data | |
696 | * | |
697 | * PARAMETERS: obj_handle - Namespace node | |
698 | * Handler - Handler for this attachment | |
699 | * Data - Pointer to data to be attached | |
700 | * | |
701 | * RETURN: Status | |
702 | * | |
703 | * DESCRIPTION: Attach arbitrary data and handler to a namespace node. | |
704 | * | |
705 | ******************************************************************************/ | |
1da177e4 | 706 | acpi_status |
4be44fcd LB |
707 | acpi_attach_data(acpi_handle obj_handle, |
708 | acpi_object_handler handler, void *data) | |
1da177e4 | 709 | { |
4be44fcd LB |
710 | struct acpi_namespace_node *node; |
711 | acpi_status status; | |
1da177e4 LT |
712 | |
713 | /* Parameter validation */ | |
714 | ||
4be44fcd | 715 | if (!obj_handle || !handler || !data) { |
1da177e4 LT |
716 | return (AE_BAD_PARAMETER); |
717 | } | |
718 | ||
4be44fcd LB |
719 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
720 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
721 | return (status); |
722 | } | |
723 | ||
724 | /* Convert and validate the handle */ | |
725 | ||
4be44fcd | 726 | node = acpi_ns_map_handle_to_node(obj_handle); |
1da177e4 LT |
727 | if (!node) { |
728 | status = AE_BAD_PARAMETER; | |
729 | goto unlock_and_exit; | |
730 | } | |
731 | ||
4be44fcd | 732 | status = acpi_ns_attach_data(node, handler, data); |
1da177e4 | 733 | |
4be44fcd LB |
734 | unlock_and_exit: |
735 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
1da177e4 LT |
736 | return (status); |
737 | } | |
738 | ||
8313524a BM |
739 | ACPI_EXPORT_SYMBOL(acpi_attach_data) |
740 | ||
1da177e4 LT |
741 | /******************************************************************************* |
742 | * | |
743 | * FUNCTION: acpi_detach_data | |
744 | * | |
745 | * PARAMETERS: obj_handle - Namespace node handle | |
746 | * Handler - Handler used in call to acpi_attach_data | |
747 | * | |
748 | * RETURN: Status | |
749 | * | |
750 | * DESCRIPTION: Remove data that was previously attached to a node. | |
751 | * | |
752 | ******************************************************************************/ | |
1da177e4 | 753 | acpi_status |
4be44fcd | 754 | acpi_detach_data(acpi_handle obj_handle, acpi_object_handler handler) |
1da177e4 | 755 | { |
4be44fcd LB |
756 | struct acpi_namespace_node *node; |
757 | acpi_status status; | |
1da177e4 LT |
758 | |
759 | /* Parameter validation */ | |
760 | ||
4be44fcd | 761 | if (!obj_handle || !handler) { |
1da177e4 LT |
762 | return (AE_BAD_PARAMETER); |
763 | } | |
764 | ||
4be44fcd LB |
765 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
766 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
767 | return (status); |
768 | } | |
769 | ||
770 | /* Convert and validate the handle */ | |
771 | ||
4be44fcd | 772 | node = acpi_ns_map_handle_to_node(obj_handle); |
1da177e4 LT |
773 | if (!node) { |
774 | status = AE_BAD_PARAMETER; | |
775 | goto unlock_and_exit; | |
776 | } | |
777 | ||
4be44fcd | 778 | status = acpi_ns_detach_data(node, handler); |
1da177e4 | 779 | |
4be44fcd LB |
780 | unlock_and_exit: |
781 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
1da177e4 LT |
782 | return (status); |
783 | } | |
784 | ||
8313524a BM |
785 | ACPI_EXPORT_SYMBOL(acpi_detach_data) |
786 | ||
1da177e4 LT |
787 | /******************************************************************************* |
788 | * | |
789 | * FUNCTION: acpi_get_data | |
790 | * | |
791 | * PARAMETERS: obj_handle - Namespace node | |
792 | * Handler - Handler used in call to attach_data | |
793 | * Data - Where the data is returned | |
794 | * | |
795 | * RETURN: Status | |
796 | * | |
797 | * DESCRIPTION: Retrieve data that was previously attached to a namespace node. | |
798 | * | |
799 | ******************************************************************************/ | |
1da177e4 | 800 | acpi_status |
4be44fcd | 801 | acpi_get_data(acpi_handle obj_handle, acpi_object_handler handler, void **data) |
1da177e4 | 802 | { |
4be44fcd LB |
803 | struct acpi_namespace_node *node; |
804 | acpi_status status; | |
1da177e4 LT |
805 | |
806 | /* Parameter validation */ | |
807 | ||
4be44fcd | 808 | if (!obj_handle || !handler || !data) { |
1da177e4 LT |
809 | return (AE_BAD_PARAMETER); |
810 | } | |
811 | ||
4be44fcd LB |
812 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
813 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
814 | return (status); |
815 | } | |
816 | ||
817 | /* Convert and validate the handle */ | |
818 | ||
4be44fcd | 819 | node = acpi_ns_map_handle_to_node(obj_handle); |
1da177e4 LT |
820 | if (!node) { |
821 | status = AE_BAD_PARAMETER; | |
822 | goto unlock_and_exit; | |
823 | } | |
824 | ||
4be44fcd | 825 | status = acpi_ns_get_attached_data(node, handler, data); |
1da177e4 | 826 | |
4be44fcd LB |
827 | unlock_and_exit: |
828 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
1da177e4 LT |
829 | return (status); |
830 | } | |
8313524a BM |
831 | |
832 | ACPI_EXPORT_SYMBOL(acpi_get_data) |