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") |
8313524a | 51 | #ifdef ACPI_FUTURE_USAGE |
1da177e4 LT |
52 | /******************************************************************************* |
53 | * | |
54 | * FUNCTION: acpi_evaluate_object_typed | |
55 | * | |
56 | * PARAMETERS: Handle - Object handle (optional) | |
44f6c012 RM |
57 | * Pathname - Object pathname (optional) |
58 | * external_params - List of parameters to pass to method, | |
1da177e4 LT |
59 | * terminated by NULL. May be NULL |
60 | * if no parameters are being passed. | |
44f6c012 | 61 | * return_buffer - Where to put method's return value (if |
1da177e4 LT |
62 | * any). If NULL, no value is returned. |
63 | * return_type - Expected type of return object | |
64 | * | |
65 | * RETURN: Status | |
66 | * | |
67 | * DESCRIPTION: Find and evaluate the given object, passing the given | |
68 | * parameters if necessary. One of "Handle" or "Pathname" must | |
69 | * be valid (non-null) | |
70 | * | |
71 | ******************************************************************************/ | |
1da177e4 | 72 | acpi_status |
4be44fcd LB |
73 | acpi_evaluate_object_typed(acpi_handle handle, |
74 | acpi_string pathname, | |
fd350943 LB |
75 | struct acpi_object_list *external_params, |
76 | struct acpi_buffer *return_buffer, | |
4be44fcd | 77 | acpi_object_type return_type) |
1da177e4 | 78 | { |
4be44fcd LB |
79 | acpi_status status; |
80 | u8 must_free = FALSE; | |
1da177e4 | 81 | |
b229cf92 | 82 | ACPI_FUNCTION_TRACE(acpi_evaluate_object_typed); |
1da177e4 LT |
83 | |
84 | /* Return buffer must be valid */ | |
85 | ||
86 | if (!return_buffer) { | |
4be44fcd | 87 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
88 | } |
89 | ||
90 | if (return_buffer->length == ACPI_ALLOCATE_BUFFER) { | |
91 | must_free = TRUE; | |
92 | } | |
93 | ||
94 | /* Evaluate the object */ | |
95 | ||
4be44fcd LB |
96 | status = |
97 | acpi_evaluate_object(handle, pathname, external_params, | |
98 | return_buffer); | |
99 | if (ACPI_FAILURE(status)) { | |
100 | return_ACPI_STATUS(status); | |
1da177e4 LT |
101 | } |
102 | ||
103 | /* Type ANY means "don't care" */ | |
104 | ||
105 | if (return_type == ACPI_TYPE_ANY) { | |
4be44fcd | 106 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
107 | } |
108 | ||
109 | if (return_buffer->length == 0) { | |
52fc0b02 | 110 | |
1da177e4 LT |
111 | /* Error because caller specifically asked for a return value */ |
112 | ||
b8e4d893 | 113 | ACPI_ERROR((AE_INFO, "No return value")); |
4be44fcd | 114 | return_ACPI_STATUS(AE_NULL_OBJECT); |
1da177e4 LT |
115 | } |
116 | ||
117 | /* Examine the object type returned from evaluate_object */ | |
118 | ||
4be44fcd LB |
119 | if (((union acpi_object *)return_buffer->pointer)->type == return_type) { |
120 | return_ACPI_STATUS(AE_OK); | |
1da177e4 LT |
121 | } |
122 | ||
123 | /* Return object type does not match requested type */ | |
124 | ||
b8e4d893 BM |
125 | ACPI_ERROR((AE_INFO, |
126 | "Incorrect return type [%s] requested [%s]", | |
127 | acpi_ut_get_type_name(((union acpi_object *)return_buffer-> | |
128 | pointer)->type), | |
129 | acpi_ut_get_type_name(return_type))); | |
1da177e4 LT |
130 | |
131 | if (must_free) { | |
52fc0b02 | 132 | |
1da177e4 LT |
133 | /* Caller used ACPI_ALLOCATE_BUFFER, free the return buffer */ |
134 | ||
02438d87 | 135 | ACPI_FREE(return_buffer->pointer); |
1da177e4 LT |
136 | return_buffer->pointer = NULL; |
137 | } | |
138 | ||
139 | return_buffer->length = 0; | |
4be44fcd | 140 | return_ACPI_STATUS(AE_TYPE); |
1da177e4 | 141 | } |
8313524a BM |
142 | |
143 | ACPI_EXPORT_SYMBOL(acpi_evaluate_object_typed) | |
4be44fcd | 144 | #endif /* ACPI_FUTURE_USAGE */ |
1da177e4 LT |
145 | /******************************************************************************* |
146 | * | |
147 | * FUNCTION: acpi_evaluate_object | |
148 | * | |
149 | * PARAMETERS: Handle - Object handle (optional) | |
150 | * Pathname - Object pathname (optional) | |
151 | * external_params - List of parameters to pass to method, | |
152 | * terminated by NULL. May be NULL | |
153 | * if no parameters are being passed. | |
154 | * return_buffer - Where to put method's return value (if | |
155 | * any). If NULL, no value is returned. | |
156 | * | |
157 | * RETURN: Status | |
158 | * | |
159 | * DESCRIPTION: Find and evaluate the given object, passing the given | |
160 | * parameters if necessary. One of "Handle" or "Pathname" must | |
161 | * be valid (non-null) | |
162 | * | |
163 | ******************************************************************************/ | |
1da177e4 | 164 | acpi_status |
4be44fcd LB |
165 | acpi_evaluate_object(acpi_handle handle, |
166 | acpi_string pathname, | |
167 | struct acpi_object_list *external_params, | |
168 | struct acpi_buffer *return_buffer) | |
1da177e4 | 169 | { |
4be44fcd | 170 | acpi_status status; |
4119532c | 171 | struct acpi_evaluate_info *info; |
4be44fcd LB |
172 | acpi_size buffer_space_needed; |
173 | u32 i; | |
1da177e4 | 174 | |
b229cf92 | 175 | ACPI_FUNCTION_TRACE(acpi_evaluate_object); |
1da177e4 | 176 | |
4119532c BM |
177 | /* Allocate and initialize the evaluation information block */ |
178 | ||
179 | info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); | |
180 | if (!info) { | |
181 | return_ACPI_STATUS(AE_NO_MEMORY); | |
182 | } | |
183 | ||
184 | info->pathname = pathname; | |
185 | info->parameter_type = ACPI_PARAM_ARGS; | |
186 | ||
187 | /* Convert and validate the device handle */ | |
188 | ||
189 | info->prefix_node = acpi_ns_map_handle_to_node(handle); | |
190 | if (!info->prefix_node) { | |
191 | status = AE_BAD_PARAMETER; | |
192 | goto cleanup; | |
193 | } | |
1da177e4 LT |
194 | |
195 | /* | |
4119532c BM |
196 | * If there are parameters to be passed to a control method, the external |
197 | * objects must all be converted to internal objects | |
1da177e4 LT |
198 | */ |
199 | if (external_params && external_params->count) { | |
200 | /* | |
201 | * Allocate a new parameter block for the internal objects | |
202 | * Add 1 to count to allow for null terminated internal list | |
203 | */ | |
4119532c BM |
204 | info->parameters = ACPI_ALLOCATE_ZEROED(((acpi_size) |
205 | external_params-> | |
206 | count + | |
207 | 1) * sizeof(void *)); | |
208 | if (!info->parameters) { | |
209 | status = AE_NO_MEMORY; | |
210 | goto cleanup; | |
1da177e4 LT |
211 | } |
212 | ||
4119532c BM |
213 | /* Convert each external object in the list to an internal object */ |
214 | ||
1da177e4 | 215 | for (i = 0; i < external_params->count; i++) { |
4be44fcd LB |
216 | status = |
217 | acpi_ut_copy_eobject_to_iobject(&external_params-> | |
218 | pointer[i], | |
4119532c | 219 | &info-> |
4be44fcd LB |
220 | parameters[i]); |
221 | if (ACPI_FAILURE(status)) { | |
4119532c | 222 | goto cleanup; |
1da177e4 LT |
223 | } |
224 | } | |
4119532c | 225 | info->parameters[external_params->count] = NULL; |
1da177e4 LT |
226 | } |
227 | ||
1da177e4 LT |
228 | /* |
229 | * Three major cases: | |
230 | * 1) Fully qualified pathname | |
231 | * 2) No handle, not fully qualified pathname (error) | |
232 | * 3) Valid handle | |
233 | */ | |
4be44fcd | 234 | if ((pathname) && (acpi_ns_valid_root_prefix(pathname[0]))) { |
52fc0b02 BM |
235 | |
236 | /* The path is fully qualified, just evaluate by name */ | |
237 | ||
4119532c BM |
238 | info->prefix_node = NULL; |
239 | status = acpi_ns_evaluate(info); | |
4be44fcd | 240 | } else if (!handle) { |
1da177e4 | 241 | /* |
4119532c BM |
242 | * A handle is optional iff a fully qualified pathname is specified. |
243 | * Since we've already handled fully qualified names above, this is | |
244 | * an error | |
1da177e4 LT |
245 | */ |
246 | if (!pathname) { | |
52fc0b02 BM |
247 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
248 | "Both Handle and Pathname are NULL")); | |
4be44fcd | 249 | } else { |
52fc0b02 BM |
250 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
251 | "Null Handle with relative pathname [%s]", | |
252 | pathname)); | |
1da177e4 LT |
253 | } |
254 | ||
255 | status = AE_BAD_PARAMETER; | |
4be44fcd | 256 | } else { |
4119532c | 257 | /* We have a namespace a node and a possible relative path */ |
52fc0b02 | 258 | |
4119532c | 259 | status = acpi_ns_evaluate(info); |
1da177e4 LT |
260 | } |
261 | ||
1da177e4 LT |
262 | /* |
263 | * If we are expecting a return value, and all went well above, | |
264 | * copy the return value to an external object. | |
265 | */ | |
266 | if (return_buffer) { | |
4119532c | 267 | if (!info->return_object) { |
1da177e4 | 268 | return_buffer->length = 0; |
4be44fcd | 269 | } else { |
4119532c | 270 | if (ACPI_GET_DESCRIPTOR_TYPE(info->return_object) == |
4be44fcd | 271 | ACPI_DESC_TYPE_NAMED) { |
1da177e4 LT |
272 | /* |
273 | * If we received a NS Node as a return object, this means that | |
274 | * the object we are evaluating has nothing interesting to | |
275 | * return (such as a mutex, etc.) We return an error because | |
276 | * these types are essentially unsupported by this interface. | |
277 | * We don't check up front because this makes it easier to add | |
278 | * support for various types at a later date if necessary. | |
279 | */ | |
280 | status = AE_TYPE; | |
4119532c | 281 | info->return_object = NULL; /* No need to delete a NS Node */ |
1da177e4 LT |
282 | return_buffer->length = 0; |
283 | } | |
284 | ||
4be44fcd | 285 | if (ACPI_SUCCESS(status)) { |
4119532c BM |
286 | |
287 | /* Get the size of the returned object */ | |
288 | ||
4be44fcd | 289 | status = |
4119532c | 290 | acpi_ut_get_object_size(info->return_object, |
4be44fcd LB |
291 | &buffer_space_needed); |
292 | if (ACPI_SUCCESS(status)) { | |
52fc0b02 | 293 | |
1da177e4 LT |
294 | /* Validate/Allocate/Clear caller buffer */ |
295 | ||
4be44fcd LB |
296 | status = |
297 | acpi_ut_initialize_buffer | |
298 | (return_buffer, | |
299 | buffer_space_needed); | |
300 | if (ACPI_FAILURE(status)) { | |
1da177e4 | 301 | /* |
52fc0b02 BM |
302 | * Caller's buffer is too small or a new one can't |
303 | * be allocated | |
1da177e4 | 304 | */ |
4be44fcd LB |
305 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
306 | "Needed buffer size %X, %s\n", | |
307 | (u32) | |
308 | buffer_space_needed, | |
309 | acpi_format_exception | |
310 | (status))); | |
311 | } else { | |
52fc0b02 BM |
312 | /* We have enough space for the object, build it */ |
313 | ||
4be44fcd LB |
314 | status = |
315 | acpi_ut_copy_iobject_to_eobject | |
4119532c | 316 | (info->return_object, |
4be44fcd | 317 | return_buffer); |
1da177e4 LT |
318 | } |
319 | } | |
320 | } | |
321 | } | |
322 | } | |
323 | ||
4119532c | 324 | if (info->return_object) { |
1da177e4 | 325 | /* |
4119532c BM |
326 | * Delete the internal return object. NOTE: Interpreter must be |
327 | * locked to avoid race condition. | |
1da177e4 | 328 | */ |
4d2acd9e | 329 | acpi_ex_enter_interpreter(); |
4119532c | 330 | |
4d2acd9e | 331 | /* Remove one reference on the return object (should delete it) */ |
4119532c | 332 | |
4d2acd9e LB |
333 | acpi_ut_remove_reference(info->return_object); |
334 | acpi_ex_exit_interpreter(); | |
1da177e4 LT |
335 | } |
336 | ||
4119532c BM |
337 | cleanup: |
338 | ||
52fc0b02 BM |
339 | /* Free the input parameter list (if we created one) */ |
340 | ||
4119532c | 341 | if (info->parameters) { |
52fc0b02 | 342 | |
1da177e4 LT |
343 | /* Free the allocated parameter block */ |
344 | ||
4119532c | 345 | acpi_ut_delete_internal_object_list(info->parameters); |
1da177e4 LT |
346 | } |
347 | ||
4119532c | 348 | ACPI_FREE(info); |
4be44fcd | 349 | return_ACPI_STATUS(status); |
1da177e4 | 350 | } |
1da177e4 | 351 | |
8313524a | 352 | ACPI_EXPORT_SYMBOL(acpi_evaluate_object) |
1da177e4 LT |
353 | |
354 | /******************************************************************************* | |
355 | * | |
356 | * FUNCTION: acpi_walk_namespace | |
357 | * | |
358 | * PARAMETERS: Type - acpi_object_type to search for | |
359 | * start_object - Handle in namespace where search begins | |
360 | * max_depth - Depth to which search is to reach | |
361 | * user_function - Called when an object of "Type" is found | |
362 | * Context - Passed to user function | |
363 | * return_value - Location where return value of | |
364 | * user_function is put if terminated early | |
365 | * | |
366 | * RETURNS Return value from the user_function if terminated early. | |
367 | * Otherwise, returns NULL. | |
368 | * | |
369 | * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, | |
370 | * starting (and ending) at the object specified by start_handle. | |
371 | * The user_function is called whenever an object that matches | |
372 | * the type parameter is found. If the user function returns | |
373 | * a non-zero value, the search is terminated immediately and this | |
374 | * value is returned to the caller. | |
375 | * | |
376 | * The point of this procedure is to provide a generic namespace | |
377 | * walk routine that can be called from multiple places to | |
378 | * provide multiple services; the User Function can be tailored | |
379 | * to each task, whether it is a print function, a compare | |
380 | * function, etc. | |
381 | * | |
382 | ******************************************************************************/ | |
1da177e4 | 383 | acpi_status |
4be44fcd LB |
384 | acpi_walk_namespace(acpi_object_type type, |
385 | acpi_handle start_object, | |
386 | u32 max_depth, | |
387 | acpi_walk_callback user_function, | |
388 | void *context, void **return_value) | |
1da177e4 | 389 | { |
4be44fcd | 390 | acpi_status status; |
1da177e4 | 391 | |
b229cf92 | 392 | ACPI_FUNCTION_TRACE(acpi_walk_namespace); |
1da177e4 LT |
393 | |
394 | /* Parameter validation */ | |
395 | ||
96db255c | 396 | if ((type > ACPI_TYPE_LOCAL_MAX) || (!max_depth) || (!user_function)) { |
4be44fcd | 397 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
398 | } |
399 | ||
400 | /* | |
401 | * Lock the namespace around the walk. | |
402 | * The namespace will be unlocked/locked around each call | |
403 | * to the user function - since this function | |
404 | * must be allowed to make Acpi calls itself. | |
405 | */ | |
4be44fcd LB |
406 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
407 | if (ACPI_FAILURE(status)) { | |
408 | return_ACPI_STATUS(status); | |
1da177e4 LT |
409 | } |
410 | ||
4be44fcd LB |
411 | status = acpi_ns_walk_namespace(type, start_object, max_depth, |
412 | ACPI_NS_WALK_UNLOCK, | |
413 | user_function, context, return_value); | |
1da177e4 | 414 | |
4be44fcd LB |
415 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
416 | return_ACPI_STATUS(status); | |
1da177e4 | 417 | } |
1da177e4 | 418 | |
8313524a | 419 | ACPI_EXPORT_SYMBOL(acpi_walk_namespace) |
1da177e4 LT |
420 | |
421 | /******************************************************************************* | |
422 | * | |
423 | * FUNCTION: acpi_ns_get_device_callback | |
424 | * | |
425 | * PARAMETERS: Callback from acpi_get_device | |
426 | * | |
427 | * RETURN: Status | |
428 | * | |
429 | * DESCRIPTION: Takes callbacks from walk_namespace and filters out all non- | |
430 | * present devices, or if they specified a HID, it filters based | |
431 | * on that. | |
432 | * | |
433 | ******************************************************************************/ | |
1da177e4 | 434 | static acpi_status |
4be44fcd LB |
435 | acpi_ns_get_device_callback(acpi_handle obj_handle, |
436 | u32 nesting_level, | |
437 | void *context, void **return_value) | |
1da177e4 | 438 | { |
4be44fcd LB |
439 | struct acpi_get_devices_info *info = context; |
440 | acpi_status status; | |
441 | struct acpi_namespace_node *node; | |
442 | u32 flags; | |
443 | struct acpi_device_id hid; | |
1da177e4 | 444 | struct acpi_compatible_id_list *cid; |
4be44fcd | 445 | acpi_native_uint i; |
1da177e4 | 446 | |
4be44fcd LB |
447 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
448 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
449 | return (status); |
450 | } | |
451 | ||
4be44fcd LB |
452 | node = acpi_ns_map_handle_to_node(obj_handle); |
453 | status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
454 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
455 | return (status); |
456 | } | |
457 | ||
458 | if (!node) { | |
459 | return (AE_BAD_PARAMETER); | |
460 | } | |
461 | ||
462 | /* Run _STA to determine if device is present */ | |
463 | ||
4be44fcd LB |
464 | status = acpi_ut_execute_STA(node, &flags); |
465 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
466 | return (AE_CTRL_DEPTH); |
467 | } | |
468 | ||
defba1d8 | 469 | if (!(flags & ACPI_STA_DEVICE_PRESENT)) { |
52fc0b02 | 470 | |
defba1d8 | 471 | /* Don't examine children of the device if not present */ |
1da177e4 LT |
472 | |
473 | return (AE_CTRL_DEPTH); | |
474 | } | |
475 | ||
476 | /* Filter based on device HID & CID */ | |
477 | ||
478 | if (info->hid != NULL) { | |
4be44fcd | 479 | status = acpi_ut_execute_HID(node, &hid); |
1da177e4 LT |
480 | if (status == AE_NOT_FOUND) { |
481 | return (AE_OK); | |
4be44fcd | 482 | } else if (ACPI_FAILURE(status)) { |
1da177e4 LT |
483 | return (AE_CTRL_DEPTH); |
484 | } | |
485 | ||
4be44fcd | 486 | if (ACPI_STRNCMP(hid.value, info->hid, sizeof(hid.value)) != 0) { |
52fc0b02 | 487 | |
1da177e4 LT |
488 | /* Get the list of Compatible IDs */ |
489 | ||
4be44fcd | 490 | status = acpi_ut_execute_CID(node, &cid); |
1da177e4 LT |
491 | if (status == AE_NOT_FOUND) { |
492 | return (AE_OK); | |
4be44fcd | 493 | } else if (ACPI_FAILURE(status)) { |
1da177e4 LT |
494 | return (AE_CTRL_DEPTH); |
495 | } | |
496 | ||
497 | /* Walk the CID list */ | |
498 | ||
499 | for (i = 0; i < cid->count; i++) { | |
4be44fcd LB |
500 | if (ACPI_STRNCMP(cid->id[i].value, info->hid, |
501 | sizeof(struct | |
502 | acpi_compatible_id)) != | |
503 | 0) { | |
8313524a | 504 | ACPI_FREE(cid); |
1da177e4 LT |
505 | return (AE_OK); |
506 | } | |
507 | } | |
8313524a | 508 | ACPI_FREE(cid); |
1da177e4 LT |
509 | } |
510 | } | |
511 | ||
4be44fcd LB |
512 | status = info->user_function(obj_handle, nesting_level, info->context, |
513 | return_value); | |
1da177e4 LT |
514 | return (status); |
515 | } | |
516 | ||
1da177e4 LT |
517 | /******************************************************************************* |
518 | * | |
519 | * FUNCTION: acpi_get_devices | |
520 | * | |
521 | * PARAMETERS: HID - HID to search for. Can be NULL. | |
522 | * user_function - Called when a matching object is found | |
523 | * Context - Passed to user function | |
524 | * return_value - Location where return value of | |
525 | * user_function is put if terminated early | |
526 | * | |
527 | * RETURNS Return value from the user_function if terminated early. | |
528 | * Otherwise, returns NULL. | |
529 | * | |
530 | * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, | |
531 | * starting (and ending) at the object specified by start_handle. | |
532 | * The user_function is called whenever an object of type | |
533 | * Device is found. If the user function returns | |
534 | * a non-zero value, the search is terminated immediately and this | |
535 | * value is returned to the caller. | |
536 | * | |
537 | * This is a wrapper for walk_namespace, but the callback performs | |
538 | * additional filtering. Please see acpi_get_device_callback. | |
539 | * | |
540 | ******************************************************************************/ | |
541 | ||
542 | acpi_status | |
4be44fcd LB |
543 | acpi_get_devices(char *HID, |
544 | acpi_walk_callback user_function, | |
545 | void *context, void **return_value) | |
1da177e4 | 546 | { |
4be44fcd LB |
547 | acpi_status status; |
548 | struct acpi_get_devices_info info; | |
1da177e4 | 549 | |
b229cf92 | 550 | ACPI_FUNCTION_TRACE(acpi_get_devices); |
1da177e4 LT |
551 | |
552 | /* Parameter validation */ | |
553 | ||
554 | if (!user_function) { | |
4be44fcd | 555 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
556 | } |
557 | ||
558 | /* | |
559 | * We're going to call their callback from OUR callback, so we need | |
560 | * to know what it is, and their context parameter. | |
561 | */ | |
52fc0b02 | 562 | info.hid = HID; |
4be44fcd | 563 | info.context = context; |
1da177e4 | 564 | info.user_function = user_function; |
1da177e4 LT |
565 | |
566 | /* | |
567 | * Lock the namespace around the walk. | |
568 | * The namespace will be unlocked/locked around each call | |
569 | * to the user function - since this function | |
570 | * must be allowed to make Acpi calls itself. | |
571 | */ | |
4be44fcd LB |
572 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
573 | if (ACPI_FAILURE(status)) { | |
574 | return_ACPI_STATUS(status); | |
1da177e4 LT |
575 | } |
576 | ||
52fc0b02 BM |
577 | status = acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
578 | ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK, | |
4be44fcd LB |
579 | acpi_ns_get_device_callback, &info, |
580 | return_value); | |
1da177e4 | 581 | |
4be44fcd LB |
582 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
583 | return_ACPI_STATUS(status); | |
1da177e4 | 584 | } |
1da177e4 | 585 | |
8313524a | 586 | ACPI_EXPORT_SYMBOL(acpi_get_devices) |
1da177e4 LT |
587 | |
588 | /******************************************************************************* | |
589 | * | |
590 | * FUNCTION: acpi_attach_data | |
591 | * | |
592 | * PARAMETERS: obj_handle - Namespace node | |
593 | * Handler - Handler for this attachment | |
594 | * Data - Pointer to data to be attached | |
595 | * | |
596 | * RETURN: Status | |
597 | * | |
598 | * DESCRIPTION: Attach arbitrary data and handler to a namespace node. | |
599 | * | |
600 | ******************************************************************************/ | |
1da177e4 | 601 | acpi_status |
4be44fcd LB |
602 | acpi_attach_data(acpi_handle obj_handle, |
603 | acpi_object_handler handler, void *data) | |
1da177e4 | 604 | { |
4be44fcd LB |
605 | struct acpi_namespace_node *node; |
606 | acpi_status status; | |
1da177e4 LT |
607 | |
608 | /* Parameter validation */ | |
609 | ||
4be44fcd | 610 | if (!obj_handle || !handler || !data) { |
1da177e4 LT |
611 | return (AE_BAD_PARAMETER); |
612 | } | |
613 | ||
4be44fcd LB |
614 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
615 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
616 | return (status); |
617 | } | |
618 | ||
619 | /* Convert and validate the handle */ | |
620 | ||
4be44fcd | 621 | node = acpi_ns_map_handle_to_node(obj_handle); |
1da177e4 LT |
622 | if (!node) { |
623 | status = AE_BAD_PARAMETER; | |
624 | goto unlock_and_exit; | |
625 | } | |
626 | ||
4be44fcd | 627 | status = acpi_ns_attach_data(node, handler, data); |
1da177e4 | 628 | |
4be44fcd LB |
629 | unlock_and_exit: |
630 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
1da177e4 LT |
631 | return (status); |
632 | } | |
633 | ||
8313524a BM |
634 | ACPI_EXPORT_SYMBOL(acpi_attach_data) |
635 | ||
1da177e4 LT |
636 | /******************************************************************************* |
637 | * | |
638 | * FUNCTION: acpi_detach_data | |
639 | * | |
640 | * PARAMETERS: obj_handle - Namespace node handle | |
641 | * Handler - Handler used in call to acpi_attach_data | |
642 | * | |
643 | * RETURN: Status | |
644 | * | |
645 | * DESCRIPTION: Remove data that was previously attached to a node. | |
646 | * | |
647 | ******************************************************************************/ | |
1da177e4 | 648 | acpi_status |
4be44fcd | 649 | acpi_detach_data(acpi_handle obj_handle, acpi_object_handler handler) |
1da177e4 | 650 | { |
4be44fcd LB |
651 | struct acpi_namespace_node *node; |
652 | acpi_status status; | |
1da177e4 LT |
653 | |
654 | /* Parameter validation */ | |
655 | ||
4be44fcd | 656 | if (!obj_handle || !handler) { |
1da177e4 LT |
657 | return (AE_BAD_PARAMETER); |
658 | } | |
659 | ||
4be44fcd LB |
660 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
661 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
662 | return (status); |
663 | } | |
664 | ||
665 | /* Convert and validate the handle */ | |
666 | ||
4be44fcd | 667 | node = acpi_ns_map_handle_to_node(obj_handle); |
1da177e4 LT |
668 | if (!node) { |
669 | status = AE_BAD_PARAMETER; | |
670 | goto unlock_and_exit; | |
671 | } | |
672 | ||
4be44fcd | 673 | status = acpi_ns_detach_data(node, handler); |
1da177e4 | 674 | |
4be44fcd LB |
675 | unlock_and_exit: |
676 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
1da177e4 LT |
677 | return (status); |
678 | } | |
679 | ||
8313524a BM |
680 | ACPI_EXPORT_SYMBOL(acpi_detach_data) |
681 | ||
1da177e4 LT |
682 | /******************************************************************************* |
683 | * | |
684 | * FUNCTION: acpi_get_data | |
685 | * | |
686 | * PARAMETERS: obj_handle - Namespace node | |
687 | * Handler - Handler used in call to attach_data | |
688 | * Data - Where the data is returned | |
689 | * | |
690 | * RETURN: Status | |
691 | * | |
692 | * DESCRIPTION: Retrieve data that was previously attached to a namespace node. | |
693 | * | |
694 | ******************************************************************************/ | |
1da177e4 | 695 | acpi_status |
4be44fcd | 696 | acpi_get_data(acpi_handle obj_handle, acpi_object_handler handler, void **data) |
1da177e4 | 697 | { |
4be44fcd LB |
698 | struct acpi_namespace_node *node; |
699 | acpi_status status; | |
1da177e4 LT |
700 | |
701 | /* Parameter validation */ | |
702 | ||
4be44fcd | 703 | if (!obj_handle || !handler || !data) { |
1da177e4 LT |
704 | return (AE_BAD_PARAMETER); |
705 | } | |
706 | ||
4be44fcd LB |
707 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
708 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
709 | return (status); |
710 | } | |
711 | ||
712 | /* Convert and validate the handle */ | |
713 | ||
4be44fcd | 714 | node = acpi_ns_map_handle_to_node(obj_handle); |
1da177e4 LT |
715 | if (!node) { |
716 | status = AE_BAD_PARAMETER; | |
717 | goto unlock_and_exit; | |
718 | } | |
719 | ||
4be44fcd | 720 | status = acpi_ns_get_attached_data(node, handler, data); |
1da177e4 | 721 | |
4be44fcd LB |
722 | unlock_and_exit: |
723 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
1da177e4 LT |
724 | return (status); |
725 | } | |
8313524a BM |
726 | |
727 | ACPI_EXPORT_SYMBOL(acpi_get_data) |