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1 /*******************************************************************************
2  *
3  * Module Name: nsxfeval - Public interfaces to the ACPI subsystem
4  *                         ACPI Object evaluation interfaces
5  *
6  ******************************************************************************/
7
8 /*
9  * Copyright (C) 2000 - 2008, Intel Corp.
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
45 #include <acpi/acpi.h>
46 #include "accommon.h"
47 #include "acnamesp.h"
48 #include "acinterp.h"
49
50 #define _COMPONENT          ACPI_NAMESPACE
51 ACPI_MODULE_NAME("nsxfeval")
52
53 /* Local prototypes */
54 static void acpi_ns_resolve_references(struct acpi_evaluate_info *info);
55
56 #ifdef ACPI_FUTURE_USAGE
57 /*******************************************************************************
58  *
59  * FUNCTION:    acpi_evaluate_object_typed
60  *
61  * PARAMETERS:  Handle              - Object handle (optional)
62  *              Pathname            - Object pathname (optional)
63  *              external_params     - List of parameters to pass to method,
64  *                                    terminated by NULL.  May be NULL
65  *                                    if no parameters are being passed.
66  *              return_buffer       - Where to put method's return value (if
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  ******************************************************************************/
77
78 acpi_status
79 acpi_evaluate_object_typed(acpi_handle handle,
80                            acpi_string pathname,
81                            struct acpi_object_list *external_params,
82                            struct acpi_buffer *return_buffer,
83                            acpi_object_type return_type)
84 {
85         acpi_status status;
86         u8 must_free = FALSE;
87
88         ACPI_FUNCTION_TRACE(acpi_evaluate_object_typed);
89
90         /* Return buffer must be valid */
91
92         if (!return_buffer) {
93                 return_ACPI_STATUS(AE_BAD_PARAMETER);
94         }
95
96         if (return_buffer->length == ACPI_ALLOCATE_BUFFER) {
97                 must_free = TRUE;
98         }
99
100         /* Evaluate the object */
101
102         status =
103             acpi_evaluate_object(handle, pathname, external_params,
104                                  return_buffer);
105         if (ACPI_FAILURE(status)) {
106                 return_ACPI_STATUS(status);
107         }
108
109         /* Type ANY means "don't care" */
110
111         if (return_type == ACPI_TYPE_ANY) {
112                 return_ACPI_STATUS(AE_OK);
113         }
114
115         if (return_buffer->length == 0) {
116
117                 /* Error because caller specifically asked for a return value */
118
119                 ACPI_ERROR((AE_INFO, "No return value"));
120                 return_ACPI_STATUS(AE_NULL_OBJECT);
121         }
122
123         /* Examine the object type returned from evaluate_object */
124
125         if (((union acpi_object *)return_buffer->pointer)->type == return_type) {
126                 return_ACPI_STATUS(AE_OK);
127         }
128
129         /* Return object type does not match requested type */
130
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)));
136
137         if (must_free) {
138
139                 /* Caller used ACPI_ALLOCATE_BUFFER, free the return buffer */
140
141                 ACPI_FREE(return_buffer->pointer);
142                 return_buffer->pointer = NULL;
143         }
144
145         return_buffer->length = 0;
146         return_ACPI_STATUS(AE_TYPE);
147 }
148
149 ACPI_EXPORT_SYMBOL(acpi_evaluate_object_typed)
150 #endif                          /*  ACPI_FUTURE_USAGE  */
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  ******************************************************************************/
170 acpi_status
171 acpi_evaluate_object(acpi_handle handle,
172                      acpi_string pathname,
173                      struct acpi_object_list *external_params,
174                      struct acpi_buffer *return_buffer)
175 {
176         acpi_status status;
177         struct acpi_evaluate_info *info;
178         acpi_size buffer_space_needed;
179         u32 i;
180
181         ACPI_FUNCTION_TRACE(acpi_evaluate_object);
182
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;
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         }
199
200         /*
201          * If there are parameters to be passed to a control method, the external
202          * objects must all be converted to internal objects
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                  */
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;
216                 }
217
218                 /* Convert each external object in the list to an internal object */
219
220                 for (i = 0; i < external_params->count; i++) {
221                         status =
222                             acpi_ut_copy_eobject_to_iobject(&external_params->
223                                                             pointer[i],
224                                                             &info->
225                                                             parameters[i]);
226                         if (ACPI_FAILURE(status)) {
227                                 goto cleanup;
228                         }
229                 }
230                 info->parameters[external_params->count] = NULL;
231         }
232
233         /*
234          * Three major cases:
235          * 1) Fully qualified pathname
236          * 2) No handle, not fully qualified pathname (error)
237          * 3) Valid handle
238          */
239         if ((pathname) && (acpi_ns_valid_root_prefix(pathname[0]))) {
240
241                 /* The path is fully qualified, just evaluate by name */
242
243                 info->prefix_node = NULL;
244                 status = acpi_ns_evaluate(info);
245         } else if (!handle) {
246                 /*
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
250                  */
251                 if (!pathname) {
252                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
253                                           "Both Handle and Pathname are NULL"));
254                 } else {
255                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
256                                           "Null Handle with relative pathname [%s]",
257                                           pathname));
258                 }
259
260                 status = AE_BAD_PARAMETER;
261         } else {
262                 /* We have a namespace a node and a possible relative path */
263
264                 status = acpi_ns_evaluate(info);
265         }
266
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) {
272                 if (!info->return_object) {
273                         return_buffer->length = 0;
274                 } else {
275                         if (ACPI_GET_DESCRIPTOR_TYPE(info->return_object) ==
276                             ACPI_DESC_TYPE_NAMED) {
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;
286                                 info->return_object = NULL;     /* No need to delete a NS Node */
287                                 return_buffer->length = 0;
288                         }
289
290                         if (ACPI_SUCCESS(status)) {
291
292                                 /* Dereference Index and ref_of references */
293
294                                 acpi_ns_resolve_references(info);
295
296                                 /* Get the size of the returned object */
297
298                                 status =
299                                     acpi_ut_get_object_size(info->return_object,
300                                                             &buffer_space_needed);
301                                 if (ACPI_SUCCESS(status)) {
302
303                                         /* Validate/Allocate/Clear caller buffer */
304
305                                         status =
306                                             acpi_ut_initialize_buffer
307                                             (return_buffer,
308                                              buffer_space_needed);
309                                         if (ACPI_FAILURE(status)) {
310                                                 /*
311                                                  * Caller's buffer is too small or a new one can't
312                                                  * be allocated
313                                                  */
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 {
321                                                 /* We have enough space for the object, build it */
322
323                                                 status =
324                                                     acpi_ut_copy_iobject_to_eobject
325                                                     (info->return_object,
326                                                      return_buffer);
327                                         }
328                                 }
329                         }
330                 }
331         }
332
333         if (info->return_object) {
334                 /*
335                  * Delete the internal return object. NOTE: Interpreter must be
336                  * locked to avoid race condition.
337                  */
338                 acpi_ex_enter_interpreter();
339
340                 /* Remove one reference on the return object (should delete it) */
341
342                 acpi_ut_remove_reference(info->return_object);
343                 acpi_ex_exit_interpreter();
344         }
345
346       cleanup:
347
348         /* Free the input parameter list (if we created one) */
349
350         if (info->parameters) {
351
352                 /* Free the allocated parameter block */
353
354                 acpi_ut_delete_internal_object_list(info->parameters);
355         }
356
357         ACPI_FREE(info);
358         return_ACPI_STATUS(status);
359 }
360
361 ACPI_EXPORT_SYMBOL(acpi_evaluate_object)
362
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 ((info->return_object)->common.type != ACPI_TYPE_LOCAL_REFERENCE) {
391                 return;
392         }
393
394         /*
395          * Two types of references are supported - those created by Index and
396          * ref_of operators. A name reference (AML_NAMEPATH_OP) can be converted
397          * to an union acpi_object, so it is not dereferenced here. A ddb_handle
398          * (AML_LOAD_OP) cannot be dereferenced, nor can it be converted to
399          * an union acpi_object.
400          */
401         switch (info->return_object->reference.class) {
402         case ACPI_REFCLASS_INDEX:
403
404                 obj_desc = *(info->return_object->reference.where);
405                 break;
406
407         case ACPI_REFCLASS_REFOF:
408
409                 node = info->return_object->reference.object;
410                 if (node) {
411                         obj_desc = node->object;
412                 }
413                 break;
414
415         default:
416                 return;
417         }
418
419         /* Replace the existing reference object */
420
421         if (obj_desc) {
422                 acpi_ut_add_reference(obj_desc);
423                 acpi_ut_remove_reference(info->return_object);
424                 info->return_object = obj_desc;
425         }
426
427         return;
428 }
429
430 /*******************************************************************************
431  *
432  * FUNCTION:    acpi_walk_namespace
433  *
434  * PARAMETERS:  Type                - acpi_object_type to search for
435  *              start_object        - Handle in namespace where search begins
436  *              max_depth           - Depth to which search is to reach
437  *              user_function       - Called when an object of "Type" is found
438  *              Context             - Passed to user function
439  *              return_value        - Location where return value of
440  *                                    user_function is put if terminated early
441  *
442  * RETURNS      Return value from the user_function if terminated early.
443  *              Otherwise, returns NULL.
444  *
445  * DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
446  *              starting (and ending) at the object specified by start_handle.
447  *              The user_function is called whenever an object that matches
448  *              the type parameter is found.  If the user function returns
449  *              a non-zero value, the search is terminated immediately and this
450  *              value is returned to the caller.
451  *
452  *              The point of this procedure is to provide a generic namespace
453  *              walk routine that can be called from multiple places to
454  *              provide multiple services;  the User Function can be tailored
455  *              to each task, whether it is a print function, a compare
456  *              function, etc.
457  *
458  ******************************************************************************/
459
460 acpi_status
461 acpi_walk_namespace(acpi_object_type type,
462                     acpi_handle start_object,
463                     u32 max_depth,
464                     acpi_walk_callback user_function,
465                     void *context, void **return_value)
466 {
467         acpi_status status;
468
469         ACPI_FUNCTION_TRACE(acpi_walk_namespace);
470
471         /* Parameter validation */
472
473         if ((type > ACPI_TYPE_LOCAL_MAX) || (!max_depth) || (!user_function)) {
474                 return_ACPI_STATUS(AE_BAD_PARAMETER);
475         }
476
477         /*
478          * Need to acquire the namespace reader lock to prevent interference
479          * with any concurrent table unloads (which causes the deletion of
480          * namespace objects). We cannot allow the deletion of a namespace node
481          * while the user function is using it. The exception to this are the
482          * nodes created and deleted during control method execution -- these
483          * nodes are marked as temporary nodes and are ignored by the namespace
484          * walk. Thus, control methods can be executed while holding the
485          * namespace deletion lock (and the user function can execute control
486          * methods.)
487          */
488         status = acpi_ut_acquire_read_lock(&acpi_gbl_namespace_rw_lock);
489         if (ACPI_FAILURE(status)) {
490                 return status;
491         }
492
493         /*
494          * Lock the namespace around the walk. The namespace will be
495          * unlocked/locked around each call to the user function - since the user
496          * function must be allowed to make ACPICA calls itself (for example, it
497          * will typically execute control methods during device enumeration.)
498          */
499         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
500         if (ACPI_FAILURE(status)) {
501                 goto unlock_and_exit;
502         }
503
504         status = acpi_ns_walk_namespace(type, start_object, max_depth,
505                                         ACPI_NS_WALK_UNLOCK, user_function,
506                                         context, return_value);
507
508         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
509
510       unlock_and_exit:
511         (void)acpi_ut_release_read_lock(&acpi_gbl_namespace_rw_lock);
512         return_ACPI_STATUS(status);
513 }
514
515 ACPI_EXPORT_SYMBOL(acpi_walk_namespace)
516
517 /*******************************************************************************
518  *
519  * FUNCTION:    acpi_ns_get_device_callback
520  *
521  * PARAMETERS:  Callback from acpi_get_device
522  *
523  * RETURN:      Status
524  *
525  * DESCRIPTION: Takes callbacks from walk_namespace and filters out all non-
526  *              present devices, or if they specified a HID, it filters based
527  *              on that.
528  *
529  ******************************************************************************/
530 static acpi_status
531 acpi_ns_get_device_callback(acpi_handle obj_handle,
532                             u32 nesting_level,
533                             void *context, void **return_value)
534 {
535         struct acpi_get_devices_info *info = context;
536         acpi_status status;
537         struct acpi_namespace_node *node;
538         u32 flags;
539         struct acpica_device_id hid;
540         struct acpi_compatible_id_list *cid;
541         u32 i;
542         int found;
543
544         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
545         if (ACPI_FAILURE(status)) {
546                 return (status);
547         }
548
549         node = acpi_ns_map_handle_to_node(obj_handle);
550         status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
551         if (ACPI_FAILURE(status)) {
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
561         status = acpi_ut_execute_STA(node, &flags);
562         if (ACPI_FAILURE(status)) {
563                 return (AE_CTRL_DEPTH);
564         }
565
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                  */
573                 return (AE_CTRL_DEPTH);
574         }
575
576         /* Filter based on device HID & CID */
577
578         if (info->hid != NULL) {
579                 status = acpi_ut_execute_HID(node, &hid);
580                 if (status == AE_NOT_FOUND) {
581                         return (AE_OK);
582                 } else if (ACPI_FAILURE(status)) {
583                         return (AE_CTRL_DEPTH);
584                 }
585
586                 if (ACPI_STRNCMP(hid.value, info->hid, sizeof(hid.value)) != 0) {
587
588                         /* Get the list of Compatible IDs */
589
590                         status = acpi_ut_execute_CID(node, &cid);
591                         if (status == AE_NOT_FOUND) {
592                                 return (AE_OK);
593                         } else if (ACPI_FAILURE(status)) {
594                                 return (AE_CTRL_DEPTH);
595                         }
596
597                         /* Walk the CID list */
598
599                         found = 0;
600                         for (i = 0; i < cid->count; i++) {
601                                 if (ACPI_STRNCMP(cid->id[i].value, info->hid,
602                                                  sizeof(struct
603                                                         acpi_compatible_id)) ==
604                                     0) {
605                                         found = 1;
606                                         break;
607                                 }
608                         }
609                         ACPI_FREE(cid);
610                         if (!found)
611                                 return (AE_OK);
612                 }
613         }
614
615         status = info->user_function(obj_handle, nesting_level, info->context,
616                                      return_value);
617         return (status);
618 }
619
620 /*******************************************************************************
621  *
622  * FUNCTION:    acpi_get_devices
623  *
624  * PARAMETERS:  HID                 - HID to search for. Can be NULL.
625  *              user_function       - Called when a matching object is found
626  *              Context             - Passed to user function
627  *              return_value        - Location where return value of
628  *                                    user_function is put if terminated early
629  *
630  * RETURNS      Return value from the user_function if terminated early.
631  *              Otherwise, returns NULL.
632  *
633  * DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
634  *              starting (and ending) at the object specified by start_handle.
635  *              The user_function is called whenever an object of type
636  *              Device is found.  If the user function returns
637  *              a non-zero value, the search is terminated immediately and this
638  *              value is returned to the caller.
639  *
640  *              This is a wrapper for walk_namespace, but the callback performs
641  *              additional filtering. Please see acpi_ns_get_device_callback.
642  *
643  ******************************************************************************/
644
645 acpi_status
646 acpi_get_devices(const char *HID,
647                  acpi_walk_callback user_function,
648                  void *context, void **return_value)
649 {
650         acpi_status status;
651         struct acpi_get_devices_info info;
652
653         ACPI_FUNCTION_TRACE(acpi_get_devices);
654
655         /* Parameter validation */
656
657         if (!user_function) {
658                 return_ACPI_STATUS(AE_BAD_PARAMETER);
659         }
660
661         /*
662          * We're going to call their callback from OUR callback, so we need
663          * to know what it is, and their context parameter.
664          */
665         info.hid = HID;
666         info.context = context;
667         info.user_function = user_function;
668
669         /*
670          * Lock the namespace around the walk.
671          * The namespace will be unlocked/locked around each call
672          * to the user function - since this function
673          * must be allowed to make Acpi calls itself.
674          */
675         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
676         if (ACPI_FAILURE(status)) {
677                 return_ACPI_STATUS(status);
678         }
679
680         status = acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
681                                         ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
682                                         acpi_ns_get_device_callback, &info,
683                                         return_value);
684
685         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
686         return_ACPI_STATUS(status);
687 }
688
689 ACPI_EXPORT_SYMBOL(acpi_get_devices)
690
691 /*******************************************************************************
692  *
693  * FUNCTION:    acpi_attach_data
694  *
695  * PARAMETERS:  obj_handle          - Namespace node
696  *              Handler             - Handler for this attachment
697  *              Data                - Pointer to data to be attached
698  *
699  * RETURN:      Status
700  *
701  * DESCRIPTION: Attach arbitrary data and handler to a namespace node.
702  *
703  ******************************************************************************/
704 acpi_status
705 acpi_attach_data(acpi_handle obj_handle,
706                  acpi_object_handler handler, void *data)
707 {
708         struct acpi_namespace_node *node;
709         acpi_status status;
710
711         /* Parameter validation */
712
713         if (!obj_handle || !handler || !data) {
714                 return (AE_BAD_PARAMETER);
715         }
716
717         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
718         if (ACPI_FAILURE(status)) {
719                 return (status);
720         }
721
722         /* Convert and validate the handle */
723
724         node = acpi_ns_map_handle_to_node(obj_handle);
725         if (!node) {
726                 status = AE_BAD_PARAMETER;
727                 goto unlock_and_exit;
728         }
729
730         status = acpi_ns_attach_data(node, handler, data);
731
732       unlock_and_exit:
733         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
734         return (status);
735 }
736
737 ACPI_EXPORT_SYMBOL(acpi_attach_data)
738
739 /*******************************************************************************
740  *
741  * FUNCTION:    acpi_detach_data
742  *
743  * PARAMETERS:  obj_handle          - Namespace node handle
744  *              Handler             - Handler used in call to acpi_attach_data
745  *
746  * RETURN:      Status
747  *
748  * DESCRIPTION: Remove data that was previously attached to a node.
749  *
750  ******************************************************************************/
751 acpi_status
752 acpi_detach_data(acpi_handle obj_handle, acpi_object_handler handler)
753 {
754         struct acpi_namespace_node *node;
755         acpi_status status;
756
757         /* Parameter validation */
758
759         if (!obj_handle || !handler) {
760                 return (AE_BAD_PARAMETER);
761         }
762
763         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
764         if (ACPI_FAILURE(status)) {
765                 return (status);
766         }
767
768         /* Convert and validate the handle */
769
770         node = acpi_ns_map_handle_to_node(obj_handle);
771         if (!node) {
772                 status = AE_BAD_PARAMETER;
773                 goto unlock_and_exit;
774         }
775
776         status = acpi_ns_detach_data(node, handler);
777
778       unlock_and_exit:
779         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
780         return (status);
781 }
782
783 ACPI_EXPORT_SYMBOL(acpi_detach_data)
784
785 /*******************************************************************************
786  *
787  * FUNCTION:    acpi_get_data
788  *
789  * PARAMETERS:  obj_handle          - Namespace node
790  *              Handler             - Handler used in call to attach_data
791  *              Data                - Where the data is returned
792  *
793  * RETURN:      Status
794  *
795  * DESCRIPTION: Retrieve data that was previously attached to a namespace node.
796  *
797  ******************************************************************************/
798 acpi_status
799 acpi_get_data(acpi_handle obj_handle, acpi_object_handler handler, void **data)
800 {
801         struct acpi_namespace_node *node;
802         acpi_status status;
803
804         /* Parameter validation */
805
806         if (!obj_handle || !handler || !data) {
807                 return (AE_BAD_PARAMETER);
808         }
809
810         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
811         if (ACPI_FAILURE(status)) {
812                 return (status);
813         }
814
815         /* Convert and validate the handle */
816
817         node = acpi_ns_map_handle_to_node(obj_handle);
818         if (!node) {
819                 status = AE_BAD_PARAMETER;
820                 goto unlock_and_exit;
821         }
822
823         status = acpi_ns_get_attached_data(node, handler, data);
824
825       unlock_and_exit:
826         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
827         return (status);
828 }
829
830 ACPI_EXPORT_SYMBOL(acpi_get_data)