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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 LT |
45 | #include <acpi/acpi.h> |
46 | #include <acpi/acnamesp.h> | |
47 | #include <acpi/acinterp.h> | |
bbc24134 | 48 | #include <acpi/amlcode.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 | ||
8313524a | 56 | #ifdef ACPI_FUTURE_USAGE |
1da177e4 LT |
57 | /******************************************************************************* |
58 | * | |
59 | * FUNCTION: acpi_evaluate_object_typed | |
60 | * | |
61 | * PARAMETERS: Handle - Object handle (optional) | |
44f6c012 RM |
62 | * Pathname - Object pathname (optional) |
63 | * external_params - List of parameters to pass to method, | |
1da177e4 LT |
64 | * terminated by NULL. May be NULL |
65 | * if no parameters are being passed. | |
44f6c012 | 66 | * return_buffer - Where to put method's return value (if |
1da177e4 LT |
67 | * any). If NULL, no value is returned. |
68 | * return_type - Expected type of return object | |
69 | * | |
70 | * RETURN: Status | |
71 | * | |
72 | * DESCRIPTION: Find and evaluate the given object, passing the given | |
73 | * parameters if necessary. One of "Handle" or "Pathname" must | |
74 | * be valid (non-null) | |
75 | * | |
76 | ******************************************************************************/ | |
bbc24134 | 77 | |
1da177e4 | 78 | acpi_status |
4be44fcd LB |
79 | acpi_evaluate_object_typed(acpi_handle handle, |
80 | acpi_string pathname, | |
fd350943 LB |
81 | struct acpi_object_list *external_params, |
82 | struct acpi_buffer *return_buffer, | |
4be44fcd | 83 | acpi_object_type return_type) |
1da177e4 | 84 | { |
4be44fcd LB |
85 | acpi_status status; |
86 | u8 must_free = FALSE; | |
1da177e4 | 87 | |
b229cf92 | 88 | ACPI_FUNCTION_TRACE(acpi_evaluate_object_typed); |
1da177e4 LT |
89 | |
90 | /* Return buffer must be valid */ | |
91 | ||
92 | if (!return_buffer) { | |
4be44fcd | 93 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
94 | } |
95 | ||
96 | if (return_buffer->length == ACPI_ALLOCATE_BUFFER) { | |
97 | must_free = TRUE; | |
98 | } | |
99 | ||
100 | /* Evaluate the object */ | |
101 | ||
4be44fcd LB |
102 | status = |
103 | acpi_evaluate_object(handle, pathname, external_params, | |
104 | return_buffer); | |
105 | if (ACPI_FAILURE(status)) { | |
106 | return_ACPI_STATUS(status); | |
1da177e4 LT |
107 | } |
108 | ||
109 | /* Type ANY means "don't care" */ | |
110 | ||
111 | if (return_type == ACPI_TYPE_ANY) { | |
4be44fcd | 112 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
113 | } |
114 | ||
115 | if (return_buffer->length == 0) { | |
52fc0b02 | 116 | |
1da177e4 LT |
117 | /* Error because caller specifically asked for a return value */ |
118 | ||
b8e4d893 | 119 | ACPI_ERROR((AE_INFO, "No return value")); |
4be44fcd | 120 | return_ACPI_STATUS(AE_NULL_OBJECT); |
1da177e4 LT |
121 | } |
122 | ||
123 | /* Examine the object type returned from evaluate_object */ | |
124 | ||
4be44fcd LB |
125 | if (((union acpi_object *)return_buffer->pointer)->type == return_type) { |
126 | return_ACPI_STATUS(AE_OK); | |
1da177e4 LT |
127 | } |
128 | ||
129 | /* Return object type does not match requested type */ | |
130 | ||
b8e4d893 BM |
131 | ACPI_ERROR((AE_INFO, |
132 | "Incorrect return type [%s] requested [%s]", | |
133 | acpi_ut_get_type_name(((union acpi_object *)return_buffer-> | |
134 | pointer)->type), | |
135 | acpi_ut_get_type_name(return_type))); | |
1da177e4 LT |
136 | |
137 | if (must_free) { | |
52fc0b02 | 138 | |
1da177e4 LT |
139 | /* Caller used ACPI_ALLOCATE_BUFFER, free the return buffer */ |
140 | ||
02438d87 | 141 | ACPI_FREE(return_buffer->pointer); |
1da177e4 LT |
142 | return_buffer->pointer = NULL; |
143 | } | |
144 | ||
145 | return_buffer->length = 0; | |
4be44fcd | 146 | return_ACPI_STATUS(AE_TYPE); |
1da177e4 | 147 | } |
8313524a BM |
148 | |
149 | ACPI_EXPORT_SYMBOL(acpi_evaluate_object_typed) | |
4be44fcd | 150 | #endif /* ACPI_FUTURE_USAGE */ |
1da177e4 LT |
151 | /******************************************************************************* |
152 | * | |
153 | * FUNCTION: acpi_evaluate_object | |
154 | * | |
155 | * PARAMETERS: Handle - Object handle (optional) | |
156 | * Pathname - Object pathname (optional) | |
157 | * external_params - List of parameters to pass to method, | |
158 | * terminated by NULL. May be NULL | |
159 | * if no parameters are being passed. | |
160 | * return_buffer - Where to put method's return value (if | |
161 | * any). If NULL, no value is returned. | |
162 | * | |
163 | * RETURN: Status | |
164 | * | |
165 | * DESCRIPTION: Find and evaluate the given object, passing the given | |
166 | * parameters if necessary. One of "Handle" or "Pathname" must | |
167 | * be valid (non-null) | |
168 | * | |
169 | ******************************************************************************/ | |
1da177e4 | 170 | acpi_status |
4be44fcd LB |
171 | acpi_evaluate_object(acpi_handle handle, |
172 | acpi_string pathname, | |
173 | struct acpi_object_list *external_params, | |
174 | struct acpi_buffer *return_buffer) | |
1da177e4 | 175 | { |
4be44fcd | 176 | acpi_status status; |
4119532c | 177 | struct acpi_evaluate_info *info; |
4be44fcd LB |
178 | acpi_size buffer_space_needed; |
179 | u32 i; | |
1da177e4 | 180 | |
b229cf92 | 181 | ACPI_FUNCTION_TRACE(acpi_evaluate_object); |
1da177e4 | 182 | |
4119532c BM |
183 | /* Allocate and initialize the evaluation information block */ |
184 | ||
185 | info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); | |
186 | if (!info) { | |
187 | return_ACPI_STATUS(AE_NO_MEMORY); | |
188 | } | |
189 | ||
190 | info->pathname = pathname; | |
4119532c BM |
191 | |
192 | /* Convert and validate the device handle */ | |
193 | ||
194 | info->prefix_node = acpi_ns_map_handle_to_node(handle); | |
195 | if (!info->prefix_node) { | |
196 | status = AE_BAD_PARAMETER; | |
197 | goto cleanup; | |
198 | } | |
1da177e4 LT |
199 | |
200 | /* | |
4119532c BM |
201 | * If there are parameters to be passed to a control method, the external |
202 | * objects must all be converted to internal objects | |
1da177e4 LT |
203 | */ |
204 | if (external_params && external_params->count) { | |
205 | /* | |
206 | * Allocate a new parameter block for the internal objects | |
207 | * Add 1 to count to allow for null terminated internal list | |
208 | */ | |
4119532c BM |
209 | info->parameters = ACPI_ALLOCATE_ZEROED(((acpi_size) |
210 | external_params-> | |
211 | count + | |
212 | 1) * sizeof(void *)); | |
213 | if (!info->parameters) { | |
214 | status = AE_NO_MEMORY; | |
215 | goto cleanup; | |
1da177e4 LT |
216 | } |
217 | ||
4119532c BM |
218 | /* Convert each external object in the list to an internal object */ |
219 | ||
1da177e4 | 220 | for (i = 0; i < external_params->count; i++) { |
4be44fcd LB |
221 | status = |
222 | acpi_ut_copy_eobject_to_iobject(&external_params-> | |
223 | pointer[i], | |
4119532c | 224 | &info-> |
4be44fcd LB |
225 | parameters[i]); |
226 | if (ACPI_FAILURE(status)) { | |
4119532c | 227 | goto cleanup; |
1da177e4 LT |
228 | } |
229 | } | |
4119532c | 230 | info->parameters[external_params->count] = NULL; |
1da177e4 LT |
231 | } |
232 | ||
1da177e4 LT |
233 | /* |
234 | * Three major cases: | |
235 | * 1) Fully qualified pathname | |
236 | * 2) No handle, not fully qualified pathname (error) | |
237 | * 3) Valid handle | |
238 | */ | |
4be44fcd | 239 | if ((pathname) && (acpi_ns_valid_root_prefix(pathname[0]))) { |
52fc0b02 BM |
240 | |
241 | /* The path is fully qualified, just evaluate by name */ | |
242 | ||
4119532c BM |
243 | info->prefix_node = NULL; |
244 | status = acpi_ns_evaluate(info); | |
4be44fcd | 245 | } else if (!handle) { |
1da177e4 | 246 | /* |
4119532c BM |
247 | * A handle is optional iff a fully qualified pathname is specified. |
248 | * Since we've already handled fully qualified names above, this is | |
249 | * an error | |
1da177e4 LT |
250 | */ |
251 | if (!pathname) { | |
52fc0b02 BM |
252 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
253 | "Both Handle and Pathname are NULL")); | |
4be44fcd | 254 | } else { |
52fc0b02 BM |
255 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
256 | "Null Handle with relative pathname [%s]", | |
257 | pathname)); | |
1da177e4 LT |
258 | } |
259 | ||
260 | status = AE_BAD_PARAMETER; | |
4be44fcd | 261 | } else { |
4119532c | 262 | /* We have a namespace a node and a possible relative path */ |
52fc0b02 | 263 | |
4119532c | 264 | status = acpi_ns_evaluate(info); |
1da177e4 LT |
265 | } |
266 | ||
1da177e4 LT |
267 | /* |
268 | * If we are expecting a return value, and all went well above, | |
269 | * copy the return value to an external object. | |
270 | */ | |
271 | if (return_buffer) { | |
4119532c | 272 | if (!info->return_object) { |
1da177e4 | 273 | return_buffer->length = 0; |
4be44fcd | 274 | } else { |
4119532c | 275 | if (ACPI_GET_DESCRIPTOR_TYPE(info->return_object) == |
4be44fcd | 276 | ACPI_DESC_TYPE_NAMED) { |
1da177e4 LT |
277 | /* |
278 | * If we received a NS Node as a return object, this means that | |
279 | * the object we are evaluating has nothing interesting to | |
280 | * return (such as a mutex, etc.) We return an error because | |
281 | * these types are essentially unsupported by this interface. | |
282 | * We don't check up front because this makes it easier to add | |
283 | * support for various types at a later date if necessary. | |
284 | */ | |
285 | status = AE_TYPE; | |
4119532c | 286 | info->return_object = NULL; /* No need to delete a NS Node */ |
1da177e4 LT |
287 | return_buffer->length = 0; |
288 | } | |
289 | ||
4be44fcd | 290 | if (ACPI_SUCCESS(status)) { |
4119532c | 291 | |
bbc24134 LM |
292 | /* Dereference Index and ref_of references */ |
293 | ||
294 | acpi_ns_resolve_references(info); | |
295 | ||
4119532c BM |
296 | /* Get the size of the returned object */ |
297 | ||
4be44fcd | 298 | status = |
4119532c | 299 | acpi_ut_get_object_size(info->return_object, |
4be44fcd LB |
300 | &buffer_space_needed); |
301 | if (ACPI_SUCCESS(status)) { | |
52fc0b02 | 302 | |
1da177e4 LT |
303 | /* Validate/Allocate/Clear caller buffer */ |
304 | ||
4be44fcd LB |
305 | status = |
306 | acpi_ut_initialize_buffer | |
307 | (return_buffer, | |
308 | buffer_space_needed); | |
309 | if (ACPI_FAILURE(status)) { | |
1da177e4 | 310 | /* |
52fc0b02 BM |
311 | * Caller's buffer is too small or a new one can't |
312 | * be allocated | |
1da177e4 | 313 | */ |
4be44fcd LB |
314 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
315 | "Needed buffer size %X, %s\n", | |
316 | (u32) | |
317 | buffer_space_needed, | |
318 | acpi_format_exception | |
319 | (status))); | |
320 | } else { | |
52fc0b02 BM |
321 | /* We have enough space for the object, build it */ |
322 | ||
4be44fcd LB |
323 | status = |
324 | acpi_ut_copy_iobject_to_eobject | |
4119532c | 325 | (info->return_object, |
4be44fcd | 326 | return_buffer); |
1da177e4 LT |
327 | } |
328 | } | |
329 | } | |
330 | } | |
331 | } | |
332 | ||
4119532c | 333 | if (info->return_object) { |
1da177e4 | 334 | /* |
4119532c BM |
335 | * Delete the internal return object. NOTE: Interpreter must be |
336 | * locked to avoid race condition. | |
1da177e4 | 337 | */ |
4d2acd9e | 338 | acpi_ex_enter_interpreter(); |
4119532c | 339 | |
4d2acd9e | 340 | /* Remove one reference on the return object (should delete it) */ |
4119532c | 341 | |
4d2acd9e LB |
342 | acpi_ut_remove_reference(info->return_object); |
343 | acpi_ex_exit_interpreter(); | |
1da177e4 LT |
344 | } |
345 | ||
4119532c BM |
346 | cleanup: |
347 | ||
52fc0b02 BM |
348 | /* Free the input parameter list (if we created one) */ |
349 | ||
4119532c | 350 | if (info->parameters) { |
52fc0b02 | 351 | |
1da177e4 LT |
352 | /* Free the allocated parameter block */ |
353 | ||
4119532c | 354 | acpi_ut_delete_internal_object_list(info->parameters); |
1da177e4 LT |
355 | } |
356 | ||
4119532c | 357 | ACPI_FREE(info); |
4be44fcd | 358 | return_ACPI_STATUS(status); |
1da177e4 | 359 | } |
1da177e4 | 360 | |
8313524a | 361 | ACPI_EXPORT_SYMBOL(acpi_evaluate_object) |
1da177e4 | 362 | |
bbc24134 LM |
363 | /******************************************************************************* |
364 | * | |
365 | * FUNCTION: acpi_ns_resolve_references | |
366 | * | |
367 | * PARAMETERS: Info - Evaluation info block | |
368 | * | |
369 | * RETURN: Info->return_object is replaced with the dereferenced object | |
370 | * | |
371 | * DESCRIPTION: Dereference certain reference objects. Called before an | |
372 | * internal return object is converted to an external union acpi_object. | |
373 | * | |
374 | * Performs an automatic dereference of Index and ref_of reference objects. | |
375 | * These reference objects are not supported by the union acpi_object, so this is a | |
376 | * last resort effort to return something useful. Also, provides compatibility | |
377 | * with other ACPI implementations. | |
378 | * | |
379 | * NOTE: does not handle references within returned package objects or nested | |
380 | * references, but this support could be added later if found to be necessary. | |
381 | * | |
382 | ******************************************************************************/ | |
383 | static void acpi_ns_resolve_references(struct acpi_evaluate_info *info) | |
384 | { | |
385 | union acpi_operand_object *obj_desc = NULL; | |
386 | struct acpi_namespace_node *node; | |
387 | ||
388 | /* We are interested in reference objects only */ | |
389 | ||
390 | if (ACPI_GET_OBJECT_TYPE(info->return_object) != | |
391 | ACPI_TYPE_LOCAL_REFERENCE) { | |
392 | return; | |
393 | } | |
394 | ||
395 | /* | |
396 | * Two types of references are supported - those created by Index and | |
397 | * ref_of operators. A name reference (AML_NAMEPATH_OP) can be converted | |
398 | * to an union acpi_object, so it is not dereferenced here. A ddb_handle | |
399 | * (AML_LOAD_OP) cannot be dereferenced, nor can it be converted to | |
400 | * an union acpi_object. | |
401 | */ | |
402 | switch (info->return_object->reference.opcode) { | |
403 | case AML_INDEX_OP: | |
404 | ||
405 | obj_desc = *(info->return_object->reference.where); | |
406 | break; | |
407 | ||
408 | case AML_REF_OF_OP: | |
409 | ||
410 | node = info->return_object->reference.object; | |
411 | if (node) { | |
412 | obj_desc = node->object; | |
413 | } | |
414 | break; | |
415 | ||
416 | default: | |
417 | return; | |
418 | } | |
419 | ||
420 | /* Replace the existing reference object */ | |
421 | ||
422 | if (obj_desc) { | |
423 | acpi_ut_add_reference(obj_desc); | |
424 | acpi_ut_remove_reference(info->return_object); | |
425 | info->return_object = obj_desc; | |
426 | } | |
427 | ||
428 | return; | |
429 | } | |
430 | ||
1da177e4 LT |
431 | /******************************************************************************* |
432 | * | |
433 | * FUNCTION: acpi_walk_namespace | |
434 | * | |
435 | * PARAMETERS: Type - acpi_object_type to search for | |
436 | * start_object - Handle in namespace where search begins | |
437 | * max_depth - Depth to which search is to reach | |
438 | * user_function - Called when an object of "Type" is found | |
439 | * Context - Passed to user function | |
440 | * return_value - Location where return value of | |
441 | * user_function is put if terminated early | |
442 | * | |
443 | * RETURNS Return value from the user_function if terminated early. | |
444 | * Otherwise, returns NULL. | |
445 | * | |
446 | * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, | |
447 | * starting (and ending) at the object specified by start_handle. | |
448 | * The user_function is called whenever an object that matches | |
449 | * the type parameter is found. If the user function returns | |
450 | * a non-zero value, the search is terminated immediately and this | |
451 | * value is returned to the caller. | |
452 | * | |
453 | * The point of this procedure is to provide a generic namespace | |
454 | * walk routine that can be called from multiple places to | |
455 | * provide multiple services; the User Function can be tailored | |
456 | * to each task, whether it is a print function, a compare | |
457 | * function, etc. | |
458 | * | |
459 | ******************************************************************************/ | |
bbc24134 | 460 | |
1da177e4 | 461 | acpi_status |
4be44fcd LB |
462 | acpi_walk_namespace(acpi_object_type type, |
463 | acpi_handle start_object, | |
464 | u32 max_depth, | |
465 | acpi_walk_callback user_function, | |
466 | void *context, void **return_value) | |
1da177e4 | 467 | { |
4be44fcd | 468 | acpi_status status; |
1da177e4 | 469 | |
b229cf92 | 470 | ACPI_FUNCTION_TRACE(acpi_walk_namespace); |
1da177e4 LT |
471 | |
472 | /* Parameter validation */ | |
473 | ||
96db255c | 474 | if ((type > ACPI_TYPE_LOCAL_MAX) || (!max_depth) || (!user_function)) { |
4be44fcd | 475 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
476 | } |
477 | ||
478 | /* | |
479 | * Lock the namespace around the walk. | |
480 | * The namespace will be unlocked/locked around each call | |
481 | * to the user function - since this function | |
482 | * must be allowed to make Acpi calls itself. | |
483 | */ | |
4be44fcd LB |
484 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
485 | if (ACPI_FAILURE(status)) { | |
486 | return_ACPI_STATUS(status); | |
1da177e4 LT |
487 | } |
488 | ||
4be44fcd LB |
489 | status = acpi_ns_walk_namespace(type, start_object, max_depth, |
490 | ACPI_NS_WALK_UNLOCK, | |
491 | user_function, context, return_value); | |
1da177e4 | 492 | |
4be44fcd LB |
493 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
494 | return_ACPI_STATUS(status); | |
1da177e4 | 495 | } |
1da177e4 | 496 | |
8313524a | 497 | ACPI_EXPORT_SYMBOL(acpi_walk_namespace) |
1da177e4 LT |
498 | |
499 | /******************************************************************************* | |
500 | * | |
501 | * FUNCTION: acpi_ns_get_device_callback | |
502 | * | |
503 | * PARAMETERS: Callback from acpi_get_device | |
504 | * | |
505 | * RETURN: Status | |
506 | * | |
507 | * DESCRIPTION: Takes callbacks from walk_namespace and filters out all non- | |
508 | * present devices, or if they specified a HID, it filters based | |
509 | * on that. | |
510 | * | |
511 | ******************************************************************************/ | |
1da177e4 | 512 | static acpi_status |
4be44fcd LB |
513 | acpi_ns_get_device_callback(acpi_handle obj_handle, |
514 | u32 nesting_level, | |
515 | void *context, void **return_value) | |
1da177e4 | 516 | { |
4be44fcd LB |
517 | struct acpi_get_devices_info *info = context; |
518 | acpi_status status; | |
519 | struct acpi_namespace_node *node; | |
520 | u32 flags; | |
8c8eb78f | 521 | struct acpica_device_id hid; |
1da177e4 | 522 | struct acpi_compatible_id_list *cid; |
67a119f9 | 523 | u32 i; |
02f8a858 | 524 | int found; |
1da177e4 | 525 | |
4be44fcd LB |
526 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
527 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
528 | return (status); |
529 | } | |
530 | ||
4be44fcd LB |
531 | node = acpi_ns_map_handle_to_node(obj_handle); |
532 | status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
533 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
534 | return (status); |
535 | } | |
536 | ||
537 | if (!node) { | |
538 | return (AE_BAD_PARAMETER); | |
539 | } | |
540 | ||
541 | /* Run _STA to determine if device is present */ | |
542 | ||
4be44fcd LB |
543 | status = acpi_ut_execute_STA(node, &flags); |
544 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
545 | return (AE_CTRL_DEPTH); |
546 | } | |
547 | ||
549f4604 BM |
548 | if (!(flags & ACPI_STA_DEVICE_PRESENT) && |
549 | !(flags & ACPI_STA_DEVICE_FUNCTIONING)) { | |
550 | /* | |
551 | * Don't examine the children of the device only when the | |
552 | * device is neither present nor functional. See ACPI spec, | |
553 | * description of _STA for more information. | |
554 | */ | |
1da177e4 LT |
555 | return (AE_CTRL_DEPTH); |
556 | } | |
557 | ||
558 | /* Filter based on device HID & CID */ | |
559 | ||
560 | if (info->hid != NULL) { | |
4be44fcd | 561 | status = acpi_ut_execute_HID(node, &hid); |
1da177e4 LT |
562 | if (status == AE_NOT_FOUND) { |
563 | return (AE_OK); | |
4be44fcd | 564 | } else if (ACPI_FAILURE(status)) { |
1da177e4 LT |
565 | return (AE_CTRL_DEPTH); |
566 | } | |
567 | ||
4be44fcd | 568 | if (ACPI_STRNCMP(hid.value, info->hid, sizeof(hid.value)) != 0) { |
52fc0b02 | 569 | |
1da177e4 LT |
570 | /* Get the list of Compatible IDs */ |
571 | ||
4be44fcd | 572 | status = acpi_ut_execute_CID(node, &cid); |
1da177e4 LT |
573 | if (status == AE_NOT_FOUND) { |
574 | return (AE_OK); | |
4be44fcd | 575 | } else if (ACPI_FAILURE(status)) { |
1da177e4 LT |
576 | return (AE_CTRL_DEPTH); |
577 | } | |
578 | ||
579 | /* Walk the CID list */ | |
580 | ||
02f8a858 | 581 | found = 0; |
1da177e4 | 582 | for (i = 0; i < cid->count; i++) { |
4be44fcd LB |
583 | if (ACPI_STRNCMP(cid->id[i].value, info->hid, |
584 | sizeof(struct | |
02f8a858 | 585 | acpi_compatible_id)) == |
4be44fcd | 586 | 0) { |
02f8a858 AP |
587 | found = 1; |
588 | break; | |
1da177e4 LT |
589 | } |
590 | } | |
8313524a | 591 | ACPI_FREE(cid); |
02f8a858 AP |
592 | if (!found) |
593 | return (AE_OK); | |
1da177e4 LT |
594 | } |
595 | } | |
596 | ||
4be44fcd LB |
597 | status = info->user_function(obj_handle, nesting_level, info->context, |
598 | return_value); | |
1da177e4 LT |
599 | return (status); |
600 | } | |
601 | ||
1da177e4 LT |
602 | /******************************************************************************* |
603 | * | |
604 | * FUNCTION: acpi_get_devices | |
605 | * | |
606 | * PARAMETERS: HID - HID to search for. Can be NULL. | |
607 | * user_function - Called when a matching object is found | |
608 | * Context - Passed to user function | |
609 | * return_value - Location where return value of | |
610 | * user_function is put if terminated early | |
611 | * | |
612 | * RETURNS Return value from the user_function if terminated early. | |
613 | * Otherwise, returns NULL. | |
614 | * | |
615 | * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, | |
616 | * starting (and ending) at the object specified by start_handle. | |
617 | * The user_function is called whenever an object of type | |
618 | * Device is found. If the user function returns | |
619 | * a non-zero value, the search is terminated immediately and this | |
620 | * value is returned to the caller. | |
621 | * | |
622 | * This is a wrapper for walk_namespace, but the callback performs | |
549f4604 | 623 | * additional filtering. Please see acpi_ns_get_device_callback. |
1da177e4 LT |
624 | * |
625 | ******************************************************************************/ | |
626 | ||
627 | acpi_status | |
70b30fb1 | 628 | acpi_get_devices(const char *HID, |
4be44fcd LB |
629 | acpi_walk_callback user_function, |
630 | void *context, void **return_value) | |
1da177e4 | 631 | { |
4be44fcd LB |
632 | acpi_status status; |
633 | struct acpi_get_devices_info info; | |
1da177e4 | 634 | |
b229cf92 | 635 | ACPI_FUNCTION_TRACE(acpi_get_devices); |
1da177e4 LT |
636 | |
637 | /* Parameter validation */ | |
638 | ||
639 | if (!user_function) { | |
4be44fcd | 640 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
641 | } |
642 | ||
643 | /* | |
644 | * We're going to call their callback from OUR callback, so we need | |
645 | * to know what it is, and their context parameter. | |
646 | */ | |
52fc0b02 | 647 | info.hid = HID; |
4be44fcd | 648 | info.context = context; |
1da177e4 | 649 | info.user_function = user_function; |
1da177e4 LT |
650 | |
651 | /* | |
652 | * Lock the namespace around the walk. | |
653 | * The namespace will be unlocked/locked around each call | |
654 | * to the user function - since this function | |
655 | * must be allowed to make Acpi calls itself. | |
656 | */ | |
4be44fcd LB |
657 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
658 | if (ACPI_FAILURE(status)) { | |
659 | return_ACPI_STATUS(status); | |
1da177e4 LT |
660 | } |
661 | ||
52fc0b02 BM |
662 | status = acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
663 | ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK, | |
4be44fcd LB |
664 | acpi_ns_get_device_callback, &info, |
665 | return_value); | |
1da177e4 | 666 | |
4be44fcd LB |
667 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
668 | return_ACPI_STATUS(status); | |
1da177e4 | 669 | } |
1da177e4 | 670 | |
8313524a | 671 | ACPI_EXPORT_SYMBOL(acpi_get_devices) |
1da177e4 LT |
672 | |
673 | /******************************************************************************* | |
674 | * | |
675 | * FUNCTION: acpi_attach_data | |
676 | * | |
677 | * PARAMETERS: obj_handle - Namespace node | |
678 | * Handler - Handler for this attachment | |
679 | * Data - Pointer to data to be attached | |
680 | * | |
681 | * RETURN: Status | |
682 | * | |
683 | * DESCRIPTION: Attach arbitrary data and handler to a namespace node. | |
684 | * | |
685 | ******************************************************************************/ | |
1da177e4 | 686 | acpi_status |
4be44fcd LB |
687 | acpi_attach_data(acpi_handle obj_handle, |
688 | acpi_object_handler handler, void *data) | |
1da177e4 | 689 | { |
4be44fcd LB |
690 | struct acpi_namespace_node *node; |
691 | acpi_status status; | |
1da177e4 LT |
692 | |
693 | /* Parameter validation */ | |
694 | ||
4be44fcd | 695 | if (!obj_handle || !handler || !data) { |
1da177e4 LT |
696 | return (AE_BAD_PARAMETER); |
697 | } | |
698 | ||
4be44fcd LB |
699 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
700 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
701 | return (status); |
702 | } | |
703 | ||
704 | /* Convert and validate the handle */ | |
705 | ||
4be44fcd | 706 | node = acpi_ns_map_handle_to_node(obj_handle); |
1da177e4 LT |
707 | if (!node) { |
708 | status = AE_BAD_PARAMETER; | |
709 | goto unlock_and_exit; | |
710 | } | |
711 | ||
4be44fcd | 712 | status = acpi_ns_attach_data(node, handler, data); |
1da177e4 | 713 | |
4be44fcd LB |
714 | unlock_and_exit: |
715 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
1da177e4 LT |
716 | return (status); |
717 | } | |
718 | ||
8313524a BM |
719 | ACPI_EXPORT_SYMBOL(acpi_attach_data) |
720 | ||
1da177e4 LT |
721 | /******************************************************************************* |
722 | * | |
723 | * FUNCTION: acpi_detach_data | |
724 | * | |
725 | * PARAMETERS: obj_handle - Namespace node handle | |
726 | * Handler - Handler used in call to acpi_attach_data | |
727 | * | |
728 | * RETURN: Status | |
729 | * | |
730 | * DESCRIPTION: Remove data that was previously attached to a node. | |
731 | * | |
732 | ******************************************************************************/ | |
1da177e4 | 733 | acpi_status |
4be44fcd | 734 | acpi_detach_data(acpi_handle obj_handle, acpi_object_handler handler) |
1da177e4 | 735 | { |
4be44fcd LB |
736 | struct acpi_namespace_node *node; |
737 | acpi_status status; | |
1da177e4 LT |
738 | |
739 | /* Parameter validation */ | |
740 | ||
4be44fcd | 741 | if (!obj_handle || !handler) { |
1da177e4 LT |
742 | return (AE_BAD_PARAMETER); |
743 | } | |
744 | ||
4be44fcd LB |
745 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
746 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
747 | return (status); |
748 | } | |
749 | ||
750 | /* Convert and validate the handle */ | |
751 | ||
4be44fcd | 752 | node = acpi_ns_map_handle_to_node(obj_handle); |
1da177e4 LT |
753 | if (!node) { |
754 | status = AE_BAD_PARAMETER; | |
755 | goto unlock_and_exit; | |
756 | } | |
757 | ||
4be44fcd | 758 | status = acpi_ns_detach_data(node, handler); |
1da177e4 | 759 | |
4be44fcd LB |
760 | unlock_and_exit: |
761 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
1da177e4 LT |
762 | return (status); |
763 | } | |
764 | ||
8313524a BM |
765 | ACPI_EXPORT_SYMBOL(acpi_detach_data) |
766 | ||
1da177e4 LT |
767 | /******************************************************************************* |
768 | * | |
769 | * FUNCTION: acpi_get_data | |
770 | * | |
771 | * PARAMETERS: obj_handle - Namespace node | |
772 | * Handler - Handler used in call to attach_data | |
773 | * Data - Where the data is returned | |
774 | * | |
775 | * RETURN: Status | |
776 | * | |
777 | * DESCRIPTION: Retrieve data that was previously attached to a namespace node. | |
778 | * | |
779 | ******************************************************************************/ | |
1da177e4 | 780 | acpi_status |
4be44fcd | 781 | acpi_get_data(acpi_handle obj_handle, acpi_object_handler handler, void **data) |
1da177e4 | 782 | { |
4be44fcd LB |
783 | struct acpi_namespace_node *node; |
784 | acpi_status status; | |
1da177e4 LT |
785 | |
786 | /* Parameter validation */ | |
787 | ||
4be44fcd | 788 | if (!obj_handle || !handler || !data) { |
1da177e4 LT |
789 | return (AE_BAD_PARAMETER); |
790 | } | |
791 | ||
4be44fcd LB |
792 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
793 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
794 | return (status); |
795 | } | |
796 | ||
797 | /* Convert and validate the handle */ | |
798 | ||
4be44fcd | 799 | node = acpi_ns_map_handle_to_node(obj_handle); |
1da177e4 LT |
800 | if (!node) { |
801 | status = AE_BAD_PARAMETER; | |
802 | goto unlock_and_exit; | |
803 | } | |
804 | ||
4be44fcd | 805 | status = acpi_ns_get_attached_data(node, handler, data); |
1da177e4 | 806 | |
4be44fcd LB |
807 | unlock_and_exit: |
808 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
1da177e4 LT |
809 | return (status); |
810 | } | |
8313524a BM |
811 | |
812 | ACPI_EXPORT_SYMBOL(acpi_get_data) |