Commit | Line | Data |
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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 | /* | |
6c9deb72 | 9 | * Copyright (C) 2000 - 2007, R. Byron Moore |
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> | |
48 | ||
1da177e4 | 49 | #define _COMPONENT ACPI_NAMESPACE |
4be44fcd | 50 | ACPI_MODULE_NAME("nsxfeval") |
1da177e4 | 51 | |
8313524a | 52 | #ifdef ACPI_FUTURE_USAGE |
1da177e4 LT |
53 | /******************************************************************************* |
54 | * | |
55 | * FUNCTION: acpi_evaluate_object_typed | |
56 | * | |
57 | * PARAMETERS: Handle - Object handle (optional) | |
44f6c012 RM |
58 | * Pathname - Object pathname (optional) |
59 | * external_params - List of parameters to pass to method, | |
1da177e4 LT |
60 | * terminated by NULL. May be NULL |
61 | * if no parameters are being passed. | |
44f6c012 | 62 | * return_buffer - Where to put method's return value (if |
1da177e4 LT |
63 | * any). If NULL, no value is returned. |
64 | * return_type - Expected type of return object | |
65 | * | |
66 | * RETURN: Status | |
67 | * | |
68 | * DESCRIPTION: Find and evaluate the given object, passing the given | |
69 | * parameters if necessary. One of "Handle" or "Pathname" must | |
70 | * be valid (non-null) | |
71 | * | |
72 | ******************************************************************************/ | |
1da177e4 | 73 | acpi_status |
4be44fcd LB |
74 | acpi_evaluate_object_typed(acpi_handle handle, |
75 | acpi_string pathname, | |
8313524a BM |
76 | struct acpi_object_list * external_params, |
77 | struct acpi_buffer * return_buffer, | |
4be44fcd | 78 | acpi_object_type return_type) |
1da177e4 | 79 | { |
4be44fcd LB |
80 | acpi_status status; |
81 | u8 must_free = FALSE; | |
1da177e4 | 82 | |
b229cf92 | 83 | ACPI_FUNCTION_TRACE(acpi_evaluate_object_typed); |
1da177e4 LT |
84 | |
85 | /* Return buffer must be valid */ | |
86 | ||
87 | if (!return_buffer) { | |
4be44fcd | 88 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
89 | } |
90 | ||
91 | if (return_buffer->length == ACPI_ALLOCATE_BUFFER) { | |
92 | must_free = TRUE; | |
93 | } | |
94 | ||
95 | /* Evaluate the object */ | |
96 | ||
4be44fcd LB |
97 | status = |
98 | acpi_evaluate_object(handle, pathname, external_params, | |
99 | return_buffer); | |
100 | if (ACPI_FAILURE(status)) { | |
101 | return_ACPI_STATUS(status); | |
1da177e4 LT |
102 | } |
103 | ||
104 | /* Type ANY means "don't care" */ | |
105 | ||
106 | if (return_type == ACPI_TYPE_ANY) { | |
4be44fcd | 107 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
108 | } |
109 | ||
110 | if (return_buffer->length == 0) { | |
52fc0b02 | 111 | |
1da177e4 LT |
112 | /* Error because caller specifically asked for a return value */ |
113 | ||
b8e4d893 | 114 | ACPI_ERROR((AE_INFO, "No return value")); |
4be44fcd | 115 | return_ACPI_STATUS(AE_NULL_OBJECT); |
1da177e4 LT |
116 | } |
117 | ||
118 | /* Examine the object type returned from evaluate_object */ | |
119 | ||
4be44fcd LB |
120 | if (((union acpi_object *)return_buffer->pointer)->type == return_type) { |
121 | return_ACPI_STATUS(AE_OK); | |
1da177e4 LT |
122 | } |
123 | ||
124 | /* Return object type does not match requested type */ | |
125 | ||
b8e4d893 BM |
126 | ACPI_ERROR((AE_INFO, |
127 | "Incorrect return type [%s] requested [%s]", | |
128 | acpi_ut_get_type_name(((union acpi_object *)return_buffer-> | |
129 | pointer)->type), | |
130 | acpi_ut_get_type_name(return_type))); | |
1da177e4 LT |
131 | |
132 | if (must_free) { | |
52fc0b02 | 133 | |
1da177e4 LT |
134 | /* Caller used ACPI_ALLOCATE_BUFFER, free the return buffer */ |
135 | ||
02438d87 | 136 | ACPI_FREE(return_buffer->pointer); |
1da177e4 LT |
137 | return_buffer->pointer = NULL; |
138 | } | |
139 | ||
140 | return_buffer->length = 0; | |
4be44fcd | 141 | return_ACPI_STATUS(AE_TYPE); |
1da177e4 | 142 | } |
8313524a BM |
143 | |
144 | ACPI_EXPORT_SYMBOL(acpi_evaluate_object_typed) | |
4be44fcd | 145 | #endif /* ACPI_FUTURE_USAGE */ |
1da177e4 LT |
146 | |
147 | /******************************************************************************* | |
148 | * | |
149 | * FUNCTION: acpi_evaluate_object | |
150 | * | |
151 | * PARAMETERS: Handle - Object handle (optional) | |
152 | * Pathname - Object pathname (optional) | |
153 | * external_params - List of parameters to pass to method, | |
154 | * terminated by NULL. May be NULL | |
155 | * if no parameters are being passed. | |
156 | * return_buffer - Where to put method's return value (if | |
157 | * any). If NULL, no value is returned. | |
158 | * | |
159 | * RETURN: Status | |
160 | * | |
161 | * DESCRIPTION: Find and evaluate the given object, passing the given | |
162 | * parameters if necessary. One of "Handle" or "Pathname" must | |
163 | * be valid (non-null) | |
164 | * | |
165 | ******************************************************************************/ | |
1da177e4 | 166 | acpi_status |
4be44fcd LB |
167 | acpi_evaluate_object(acpi_handle handle, |
168 | acpi_string pathname, | |
169 | struct acpi_object_list *external_params, | |
170 | struct acpi_buffer *return_buffer) | |
1da177e4 | 171 | { |
4be44fcd | 172 | acpi_status status; |
4119532c | 173 | struct acpi_evaluate_info *info; |
4be44fcd LB |
174 | acpi_size buffer_space_needed; |
175 | u32 i; | |
1da177e4 | 176 | |
b229cf92 | 177 | ACPI_FUNCTION_TRACE(acpi_evaluate_object); |
1da177e4 | 178 | |
4119532c BM |
179 | /* Allocate and initialize the evaluation information block */ |
180 | ||
181 | info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); | |
182 | if (!info) { | |
183 | return_ACPI_STATUS(AE_NO_MEMORY); | |
184 | } | |
185 | ||
186 | info->pathname = pathname; | |
187 | info->parameter_type = ACPI_PARAM_ARGS; | |
188 | ||
189 | /* Convert and validate the device handle */ | |
190 | ||
191 | info->prefix_node = acpi_ns_map_handle_to_node(handle); | |
192 | if (!info->prefix_node) { | |
193 | status = AE_BAD_PARAMETER; | |
194 | goto cleanup; | |
195 | } | |
1da177e4 LT |
196 | |
197 | /* | |
4119532c BM |
198 | * If there are parameters to be passed to a control method, the external |
199 | * objects must all be converted to internal objects | |
1da177e4 LT |
200 | */ |
201 | if (external_params && external_params->count) { | |
202 | /* | |
203 | * Allocate a new parameter block for the internal objects | |
204 | * Add 1 to count to allow for null terminated internal list | |
205 | */ | |
4119532c BM |
206 | info->parameters = ACPI_ALLOCATE_ZEROED(((acpi_size) |
207 | external_params-> | |
208 | count + | |
209 | 1) * sizeof(void *)); | |
210 | if (!info->parameters) { | |
211 | status = AE_NO_MEMORY; | |
212 | goto cleanup; | |
1da177e4 LT |
213 | } |
214 | ||
4119532c BM |
215 | /* Convert each external object in the list to an internal object */ |
216 | ||
1da177e4 | 217 | for (i = 0; i < external_params->count; i++) { |
4be44fcd LB |
218 | status = |
219 | acpi_ut_copy_eobject_to_iobject(&external_params-> | |
220 | pointer[i], | |
4119532c | 221 | &info-> |
4be44fcd LB |
222 | parameters[i]); |
223 | if (ACPI_FAILURE(status)) { | |
4119532c | 224 | goto cleanup; |
1da177e4 LT |
225 | } |
226 | } | |
4119532c | 227 | info->parameters[external_params->count] = NULL; |
1da177e4 LT |
228 | } |
229 | ||
1da177e4 LT |
230 | /* |
231 | * Three major cases: | |
232 | * 1) Fully qualified pathname | |
233 | * 2) No handle, not fully qualified pathname (error) | |
234 | * 3) Valid handle | |
235 | */ | |
4be44fcd | 236 | if ((pathname) && (acpi_ns_valid_root_prefix(pathname[0]))) { |
52fc0b02 BM |
237 | |
238 | /* The path is fully qualified, just evaluate by name */ | |
239 | ||
4119532c BM |
240 | info->prefix_node = NULL; |
241 | status = acpi_ns_evaluate(info); | |
4be44fcd | 242 | } else if (!handle) { |
1da177e4 | 243 | /* |
4119532c BM |
244 | * A handle is optional iff a fully qualified pathname is specified. |
245 | * Since we've already handled fully qualified names above, this is | |
246 | * an error | |
1da177e4 LT |
247 | */ |
248 | if (!pathname) { | |
52fc0b02 BM |
249 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
250 | "Both Handle and Pathname are NULL")); | |
4be44fcd | 251 | } else { |
52fc0b02 BM |
252 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
253 | "Null Handle with relative pathname [%s]", | |
254 | pathname)); | |
1da177e4 LT |
255 | } |
256 | ||
257 | status = AE_BAD_PARAMETER; | |
4be44fcd | 258 | } else { |
4119532c | 259 | /* We have a namespace a node and a possible relative path */ |
52fc0b02 | 260 | |
4119532c | 261 | status = acpi_ns_evaluate(info); |
1da177e4 LT |
262 | } |
263 | ||
1da177e4 LT |
264 | /* |
265 | * If we are expecting a return value, and all went well above, | |
266 | * copy the return value to an external object. | |
267 | */ | |
268 | if (return_buffer) { | |
4119532c | 269 | if (!info->return_object) { |
1da177e4 | 270 | return_buffer->length = 0; |
4be44fcd | 271 | } else { |
4119532c | 272 | if (ACPI_GET_DESCRIPTOR_TYPE(info->return_object) == |
4be44fcd | 273 | ACPI_DESC_TYPE_NAMED) { |
1da177e4 LT |
274 | /* |
275 | * If we received a NS Node as a return object, this means that | |
276 | * the object we are evaluating has nothing interesting to | |
277 | * return (such as a mutex, etc.) We return an error because | |
278 | * these types are essentially unsupported by this interface. | |
279 | * We don't check up front because this makes it easier to add | |
280 | * support for various types at a later date if necessary. | |
281 | */ | |
282 | status = AE_TYPE; | |
4119532c | 283 | info->return_object = NULL; /* No need to delete a NS Node */ |
1da177e4 LT |
284 | return_buffer->length = 0; |
285 | } | |
286 | ||
4be44fcd | 287 | if (ACPI_SUCCESS(status)) { |
4119532c BM |
288 | |
289 | /* Get the size of the returned object */ | |
290 | ||
4be44fcd | 291 | status = |
4119532c | 292 | acpi_ut_get_object_size(info->return_object, |
4be44fcd LB |
293 | &buffer_space_needed); |
294 | if (ACPI_SUCCESS(status)) { | |
52fc0b02 | 295 | |
1da177e4 LT |
296 | /* Validate/Allocate/Clear caller buffer */ |
297 | ||
4be44fcd LB |
298 | status = |
299 | acpi_ut_initialize_buffer | |
300 | (return_buffer, | |
301 | buffer_space_needed); | |
302 | if (ACPI_FAILURE(status)) { | |
1da177e4 | 303 | /* |
52fc0b02 BM |
304 | * Caller's buffer is too small or a new one can't |
305 | * be allocated | |
1da177e4 | 306 | */ |
4be44fcd LB |
307 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
308 | "Needed buffer size %X, %s\n", | |
309 | (u32) | |
310 | buffer_space_needed, | |
311 | acpi_format_exception | |
312 | (status))); | |
313 | } else { | |
52fc0b02 BM |
314 | /* We have enough space for the object, build it */ |
315 | ||
4be44fcd LB |
316 | status = |
317 | acpi_ut_copy_iobject_to_eobject | |
4119532c | 318 | (info->return_object, |
4be44fcd | 319 | return_buffer); |
1da177e4 LT |
320 | } |
321 | } | |
322 | } | |
323 | } | |
324 | } | |
325 | ||
4119532c | 326 | if (info->return_object) { |
1da177e4 | 327 | /* |
4119532c BM |
328 | * Delete the internal return object. NOTE: Interpreter must be |
329 | * locked to avoid race condition. | |
1da177e4 | 330 | */ |
4d2acd9e | 331 | acpi_ex_enter_interpreter(); |
4119532c | 332 | |
4d2acd9e | 333 | /* Remove one reference on the return object (should delete it) */ |
4119532c | 334 | |
4d2acd9e LB |
335 | acpi_ut_remove_reference(info->return_object); |
336 | acpi_ex_exit_interpreter(); | |
1da177e4 LT |
337 | } |
338 | ||
4119532c BM |
339 | cleanup: |
340 | ||
52fc0b02 BM |
341 | /* Free the input parameter list (if we created one) */ |
342 | ||
4119532c | 343 | if (info->parameters) { |
52fc0b02 | 344 | |
1da177e4 LT |
345 | /* Free the allocated parameter block */ |
346 | ||
4119532c | 347 | acpi_ut_delete_internal_object_list(info->parameters); |
1da177e4 LT |
348 | } |
349 | ||
4119532c | 350 | ACPI_FREE(info); |
4be44fcd | 351 | return_ACPI_STATUS(status); |
1da177e4 | 352 | } |
1da177e4 | 353 | |
8313524a | 354 | ACPI_EXPORT_SYMBOL(acpi_evaluate_object) |
1da177e4 LT |
355 | |
356 | /******************************************************************************* | |
357 | * | |
358 | * FUNCTION: acpi_walk_namespace | |
359 | * | |
360 | * PARAMETERS: Type - acpi_object_type to search for | |
361 | * start_object - Handle in namespace where search begins | |
362 | * max_depth - Depth to which search is to reach | |
363 | * user_function - Called when an object of "Type" is found | |
364 | * Context - Passed to user function | |
365 | * return_value - Location where return value of | |
366 | * user_function is put if terminated early | |
367 | * | |
368 | * RETURNS Return value from the user_function if terminated early. | |
369 | * Otherwise, returns NULL. | |
370 | * | |
371 | * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, | |
372 | * starting (and ending) at the object specified by start_handle. | |
373 | * The user_function is called whenever an object that matches | |
374 | * the type parameter is found. If the user function returns | |
375 | * a non-zero value, the search is terminated immediately and this | |
376 | * value is returned to the caller. | |
377 | * | |
378 | * The point of this procedure is to provide a generic namespace | |
379 | * walk routine that can be called from multiple places to | |
380 | * provide multiple services; the User Function can be tailored | |
381 | * to each task, whether it is a print function, a compare | |
382 | * function, etc. | |
383 | * | |
384 | ******************************************************************************/ | |
1da177e4 | 385 | acpi_status |
4be44fcd LB |
386 | acpi_walk_namespace(acpi_object_type type, |
387 | acpi_handle start_object, | |
388 | u32 max_depth, | |
389 | acpi_walk_callback user_function, | |
390 | void *context, void **return_value) | |
1da177e4 | 391 | { |
4be44fcd | 392 | acpi_status status; |
1da177e4 | 393 | |
b229cf92 | 394 | ACPI_FUNCTION_TRACE(acpi_walk_namespace); |
1da177e4 LT |
395 | |
396 | /* Parameter validation */ | |
397 | ||
96db255c | 398 | if ((type > ACPI_TYPE_LOCAL_MAX) || (!max_depth) || (!user_function)) { |
4be44fcd | 399 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
400 | } |
401 | ||
402 | /* | |
403 | * Lock the namespace around the walk. | |
404 | * The namespace will be unlocked/locked around each call | |
405 | * to the user function - since this function | |
406 | * must be allowed to make Acpi calls itself. | |
407 | */ | |
4be44fcd LB |
408 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
409 | if (ACPI_FAILURE(status)) { | |
410 | return_ACPI_STATUS(status); | |
1da177e4 LT |
411 | } |
412 | ||
4be44fcd LB |
413 | status = acpi_ns_walk_namespace(type, start_object, max_depth, |
414 | ACPI_NS_WALK_UNLOCK, | |
415 | user_function, context, return_value); | |
1da177e4 | 416 | |
4be44fcd LB |
417 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
418 | return_ACPI_STATUS(status); | |
1da177e4 | 419 | } |
1da177e4 | 420 | |
8313524a | 421 | ACPI_EXPORT_SYMBOL(acpi_walk_namespace) |
1da177e4 LT |
422 | |
423 | /******************************************************************************* | |
424 | * | |
425 | * FUNCTION: acpi_ns_get_device_callback | |
426 | * | |
427 | * PARAMETERS: Callback from acpi_get_device | |
428 | * | |
429 | * RETURN: Status | |
430 | * | |
431 | * DESCRIPTION: Takes callbacks from walk_namespace and filters out all non- | |
432 | * present devices, or if they specified a HID, it filters based | |
433 | * on that. | |
434 | * | |
435 | ******************************************************************************/ | |
1da177e4 | 436 | static acpi_status |
4be44fcd LB |
437 | acpi_ns_get_device_callback(acpi_handle obj_handle, |
438 | u32 nesting_level, | |
439 | void *context, void **return_value) | |
1da177e4 | 440 | { |
4be44fcd LB |
441 | struct acpi_get_devices_info *info = context; |
442 | acpi_status status; | |
443 | struct acpi_namespace_node *node; | |
444 | u32 flags; | |
445 | struct acpi_device_id hid; | |
1da177e4 | 446 | struct acpi_compatible_id_list *cid; |
4be44fcd | 447 | acpi_native_uint i; |
1da177e4 | 448 | |
4be44fcd LB |
449 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
450 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
451 | return (status); |
452 | } | |
453 | ||
4be44fcd LB |
454 | node = acpi_ns_map_handle_to_node(obj_handle); |
455 | status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
456 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
457 | return (status); |
458 | } | |
459 | ||
460 | if (!node) { | |
461 | return (AE_BAD_PARAMETER); | |
462 | } | |
463 | ||
464 | /* Run _STA to determine if device is present */ | |
465 | ||
4be44fcd LB |
466 | status = acpi_ut_execute_STA(node, &flags); |
467 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
468 | return (AE_CTRL_DEPTH); |
469 | } | |
470 | ||
defba1d8 | 471 | if (!(flags & ACPI_STA_DEVICE_PRESENT)) { |
52fc0b02 | 472 | |
defba1d8 | 473 | /* Don't examine children of the device if not present */ |
1da177e4 LT |
474 | |
475 | return (AE_CTRL_DEPTH); | |
476 | } | |
477 | ||
478 | /* Filter based on device HID & CID */ | |
479 | ||
480 | if (info->hid != NULL) { | |
4be44fcd | 481 | status = acpi_ut_execute_HID(node, &hid); |
1da177e4 LT |
482 | if (status == AE_NOT_FOUND) { |
483 | return (AE_OK); | |
4be44fcd | 484 | } else if (ACPI_FAILURE(status)) { |
1da177e4 LT |
485 | return (AE_CTRL_DEPTH); |
486 | } | |
487 | ||
4be44fcd | 488 | if (ACPI_STRNCMP(hid.value, info->hid, sizeof(hid.value)) != 0) { |
52fc0b02 | 489 | |
1da177e4 LT |
490 | /* Get the list of Compatible IDs */ |
491 | ||
4be44fcd | 492 | status = acpi_ut_execute_CID(node, &cid); |
1da177e4 LT |
493 | if (status == AE_NOT_FOUND) { |
494 | return (AE_OK); | |
4be44fcd | 495 | } else if (ACPI_FAILURE(status)) { |
1da177e4 LT |
496 | return (AE_CTRL_DEPTH); |
497 | } | |
498 | ||
499 | /* Walk the CID list */ | |
500 | ||
501 | for (i = 0; i < cid->count; i++) { | |
4be44fcd LB |
502 | if (ACPI_STRNCMP(cid->id[i].value, info->hid, |
503 | sizeof(struct | |
504 | acpi_compatible_id)) != | |
505 | 0) { | |
8313524a | 506 | ACPI_FREE(cid); |
1da177e4 LT |
507 | return (AE_OK); |
508 | } | |
509 | } | |
8313524a | 510 | ACPI_FREE(cid); |
1da177e4 LT |
511 | } |
512 | } | |
513 | ||
4be44fcd LB |
514 | status = info->user_function(obj_handle, nesting_level, info->context, |
515 | return_value); | |
1da177e4 LT |
516 | return (status); |
517 | } | |
518 | ||
1da177e4 LT |
519 | /******************************************************************************* |
520 | * | |
521 | * FUNCTION: acpi_get_devices | |
522 | * | |
523 | * PARAMETERS: HID - HID to search for. Can be NULL. | |
524 | * user_function - Called when a matching object is found | |
525 | * Context - Passed to user function | |
526 | * return_value - Location where return value of | |
527 | * user_function is put if terminated early | |
528 | * | |
529 | * RETURNS Return value from the user_function if terminated early. | |
530 | * Otherwise, returns NULL. | |
531 | * | |
532 | * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, | |
533 | * starting (and ending) at the object specified by start_handle. | |
534 | * The user_function is called whenever an object of type | |
535 | * Device is found. If the user function returns | |
536 | * a non-zero value, the search is terminated immediately and this | |
537 | * value is returned to the caller. | |
538 | * | |
539 | * This is a wrapper for walk_namespace, but the callback performs | |
540 | * additional filtering. Please see acpi_get_device_callback. | |
541 | * | |
542 | ******************************************************************************/ | |
543 | ||
544 | acpi_status | |
4be44fcd LB |
545 | acpi_get_devices(char *HID, |
546 | acpi_walk_callback user_function, | |
547 | void *context, void **return_value) | |
1da177e4 | 548 | { |
4be44fcd LB |
549 | acpi_status status; |
550 | struct acpi_get_devices_info info; | |
1da177e4 | 551 | |
b229cf92 | 552 | ACPI_FUNCTION_TRACE(acpi_get_devices); |
1da177e4 LT |
553 | |
554 | /* Parameter validation */ | |
555 | ||
556 | if (!user_function) { | |
4be44fcd | 557 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
558 | } |
559 | ||
560 | /* | |
561 | * We're going to call their callback from OUR callback, so we need | |
562 | * to know what it is, and their context parameter. | |
563 | */ | |
52fc0b02 | 564 | info.hid = HID; |
4be44fcd | 565 | info.context = context; |
1da177e4 | 566 | info.user_function = user_function; |
1da177e4 LT |
567 | |
568 | /* | |
569 | * Lock the namespace around the walk. | |
570 | * The namespace will be unlocked/locked around each call | |
571 | * to the user function - since this function | |
572 | * must be allowed to make Acpi calls itself. | |
573 | */ | |
4be44fcd LB |
574 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
575 | if (ACPI_FAILURE(status)) { | |
576 | return_ACPI_STATUS(status); | |
1da177e4 LT |
577 | } |
578 | ||
52fc0b02 BM |
579 | status = acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
580 | ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK, | |
4be44fcd LB |
581 | acpi_ns_get_device_callback, &info, |
582 | return_value); | |
1da177e4 | 583 | |
4be44fcd LB |
584 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
585 | return_ACPI_STATUS(status); | |
1da177e4 | 586 | } |
1da177e4 | 587 | |
8313524a | 588 | ACPI_EXPORT_SYMBOL(acpi_get_devices) |
1da177e4 LT |
589 | |
590 | /******************************************************************************* | |
591 | * | |
592 | * FUNCTION: acpi_attach_data | |
593 | * | |
594 | * PARAMETERS: obj_handle - Namespace node | |
595 | * Handler - Handler for this attachment | |
596 | * Data - Pointer to data to be attached | |
597 | * | |
598 | * RETURN: Status | |
599 | * | |
600 | * DESCRIPTION: Attach arbitrary data and handler to a namespace node. | |
601 | * | |
602 | ******************************************************************************/ | |
1da177e4 | 603 | acpi_status |
4be44fcd LB |
604 | acpi_attach_data(acpi_handle obj_handle, |
605 | acpi_object_handler handler, void *data) | |
1da177e4 | 606 | { |
4be44fcd LB |
607 | struct acpi_namespace_node *node; |
608 | acpi_status status; | |
1da177e4 LT |
609 | |
610 | /* Parameter validation */ | |
611 | ||
4be44fcd | 612 | if (!obj_handle || !handler || !data) { |
1da177e4 LT |
613 | return (AE_BAD_PARAMETER); |
614 | } | |
615 | ||
4be44fcd LB |
616 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
617 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
618 | return (status); |
619 | } | |
620 | ||
621 | /* Convert and validate the handle */ | |
622 | ||
4be44fcd | 623 | node = acpi_ns_map_handle_to_node(obj_handle); |
1da177e4 LT |
624 | if (!node) { |
625 | status = AE_BAD_PARAMETER; | |
626 | goto unlock_and_exit; | |
627 | } | |
628 | ||
4be44fcd | 629 | status = acpi_ns_attach_data(node, handler, data); |
1da177e4 | 630 | |
4be44fcd LB |
631 | unlock_and_exit: |
632 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
1da177e4 LT |
633 | return (status); |
634 | } | |
635 | ||
8313524a BM |
636 | ACPI_EXPORT_SYMBOL(acpi_attach_data) |
637 | ||
1da177e4 LT |
638 | /******************************************************************************* |
639 | * | |
640 | * FUNCTION: acpi_detach_data | |
641 | * | |
642 | * PARAMETERS: obj_handle - Namespace node handle | |
643 | * Handler - Handler used in call to acpi_attach_data | |
644 | * | |
645 | * RETURN: Status | |
646 | * | |
647 | * DESCRIPTION: Remove data that was previously attached to a node. | |
648 | * | |
649 | ******************************************************************************/ | |
1da177e4 | 650 | acpi_status |
4be44fcd | 651 | acpi_detach_data(acpi_handle obj_handle, acpi_object_handler handler) |
1da177e4 | 652 | { |
4be44fcd LB |
653 | struct acpi_namespace_node *node; |
654 | acpi_status status; | |
1da177e4 LT |
655 | |
656 | /* Parameter validation */ | |
657 | ||
4be44fcd | 658 | if (!obj_handle || !handler) { |
1da177e4 LT |
659 | return (AE_BAD_PARAMETER); |
660 | } | |
661 | ||
4be44fcd LB |
662 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
663 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
664 | return (status); |
665 | } | |
666 | ||
667 | /* Convert and validate the handle */ | |
668 | ||
4be44fcd | 669 | node = acpi_ns_map_handle_to_node(obj_handle); |
1da177e4 LT |
670 | if (!node) { |
671 | status = AE_BAD_PARAMETER; | |
672 | goto unlock_and_exit; | |
673 | } | |
674 | ||
4be44fcd | 675 | status = acpi_ns_detach_data(node, handler); |
1da177e4 | 676 | |
4be44fcd LB |
677 | unlock_and_exit: |
678 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
1da177e4 LT |
679 | return (status); |
680 | } | |
681 | ||
8313524a BM |
682 | ACPI_EXPORT_SYMBOL(acpi_detach_data) |
683 | ||
1da177e4 LT |
684 | /******************************************************************************* |
685 | * | |
686 | * FUNCTION: acpi_get_data | |
687 | * | |
688 | * PARAMETERS: obj_handle - Namespace node | |
689 | * Handler - Handler used in call to attach_data | |
690 | * Data - Where the data is returned | |
691 | * | |
692 | * RETURN: Status | |
693 | * | |
694 | * DESCRIPTION: Retrieve data that was previously attached to a namespace node. | |
695 | * | |
696 | ******************************************************************************/ | |
1da177e4 | 697 | acpi_status |
4be44fcd | 698 | acpi_get_data(acpi_handle obj_handle, acpi_object_handler handler, void **data) |
1da177e4 | 699 | { |
4be44fcd LB |
700 | struct acpi_namespace_node *node; |
701 | acpi_status status; | |
1da177e4 LT |
702 | |
703 | /* Parameter validation */ | |
704 | ||
4be44fcd | 705 | if (!obj_handle || !handler || !data) { |
1da177e4 LT |
706 | return (AE_BAD_PARAMETER); |
707 | } | |
708 | ||
4be44fcd LB |
709 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
710 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
711 | return (status); |
712 | } | |
713 | ||
714 | /* Convert and validate the handle */ | |
715 | ||
4be44fcd | 716 | node = acpi_ns_map_handle_to_node(obj_handle); |
1da177e4 LT |
717 | if (!node) { |
718 | status = AE_BAD_PARAMETER; | |
719 | goto unlock_and_exit; | |
720 | } | |
721 | ||
4be44fcd | 722 | status = acpi_ns_get_attached_data(node, handler, data); |
1da177e4 | 723 | |
4be44fcd LB |
724 | unlock_and_exit: |
725 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
1da177e4 LT |
726 | return (status); |
727 | } | |
8313524a BM |
728 | |
729 | ACPI_EXPORT_SYMBOL(acpi_get_data) |