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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 | /* | |
4a90c7e8 | 9 | * Copyright (C) 2000 - 2006, 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 | ||
45 | #include <linux/module.h> | |
46 | ||
47 | #include <acpi/acpi.h> | |
48 | #include <acpi/acnamesp.h> | |
49 | #include <acpi/acinterp.h> | |
50 | ||
1da177e4 | 51 | #define _COMPONENT ACPI_NAMESPACE |
4be44fcd | 52 | ACPI_MODULE_NAME("nsxfeval") |
1da177e4 LT |
53 | |
54 | /******************************************************************************* | |
55 | * | |
56 | * FUNCTION: acpi_evaluate_object_typed | |
57 | * | |
58 | * PARAMETERS: Handle - Object handle (optional) | |
44f6c012 RM |
59 | * Pathname - Object pathname (optional) |
60 | * external_params - List of parameters to pass to method, | |
1da177e4 LT |
61 | * terminated by NULL. May be NULL |
62 | * if no parameters are being passed. | |
44f6c012 | 63 | * return_buffer - Where to put method's return value (if |
1da177e4 LT |
64 | * any). If NULL, no value is returned. |
65 | * return_type - Expected type of return object | |
66 | * | |
67 | * RETURN: Status | |
68 | * | |
69 | * DESCRIPTION: Find and evaluate the given object, passing the given | |
70 | * parameters if necessary. One of "Handle" or "Pathname" must | |
71 | * be valid (non-null) | |
72 | * | |
73 | ******************************************************************************/ | |
74 | #ifdef ACPI_FUTURE_USAGE | |
75 | acpi_status | |
4be44fcd LB |
76 | acpi_evaluate_object_typed(acpi_handle handle, |
77 | acpi_string pathname, | |
78 | struct acpi_object_list *external_params, | |
79 | struct acpi_buffer *return_buffer, | |
80 | acpi_object_type return_type) | |
1da177e4 | 81 | { |
4be44fcd LB |
82 | acpi_status status; |
83 | u8 must_free = FALSE; | |
1da177e4 | 84 | |
4be44fcd | 85 | ACPI_FUNCTION_TRACE("acpi_evaluate_object_typed"); |
1da177e4 LT |
86 | |
87 | /* Return buffer must be valid */ | |
88 | ||
89 | if (!return_buffer) { | |
4be44fcd | 90 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
91 | } |
92 | ||
93 | if (return_buffer->length == ACPI_ALLOCATE_BUFFER) { | |
94 | must_free = TRUE; | |
95 | } | |
96 | ||
97 | /* Evaluate the object */ | |
98 | ||
4be44fcd LB |
99 | status = |
100 | acpi_evaluate_object(handle, pathname, external_params, | |
101 | return_buffer); | |
102 | if (ACPI_FAILURE(status)) { | |
103 | return_ACPI_STATUS(status); | |
1da177e4 LT |
104 | } |
105 | ||
106 | /* Type ANY means "don't care" */ | |
107 | ||
108 | if (return_type == ACPI_TYPE_ANY) { | |
4be44fcd | 109 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
110 | } |
111 | ||
112 | if (return_buffer->length == 0) { | |
113 | /* Error because caller specifically asked for a return value */ | |
114 | ||
4a90c7e8 | 115 | ACPI_REPORT_ERROR(("No return value\n")); |
4be44fcd | 116 | return_ACPI_STATUS(AE_NULL_OBJECT); |
1da177e4 LT |
117 | } |
118 | ||
119 | /* Examine the object type returned from evaluate_object */ | |
120 | ||
4be44fcd LB |
121 | if (((union acpi_object *)return_buffer->pointer)->type == return_type) { |
122 | return_ACPI_STATUS(AE_OK); | |
1da177e4 LT |
123 | } |
124 | ||
125 | /* Return object type does not match requested type */ | |
126 | ||
4a90c7e8 BM |
127 | ACPI_REPORT_ERROR(("Incorrect return type [%s] requested [%s]\n", |
128 | acpi_ut_get_type_name(((union acpi_object *) | |
129 | return_buffer->pointer)-> | |
130 | type), | |
131 | acpi_ut_get_type_name(return_type))); | |
1da177e4 LT |
132 | |
133 | if (must_free) { | |
134 | /* Caller used ACPI_ALLOCATE_BUFFER, free the return buffer */ | |
135 | ||
4be44fcd | 136 | acpi_os_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 | } |
4be44fcd | 143 | #endif /* ACPI_FUTURE_USAGE */ |
1da177e4 LT |
144 | |
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 | ******************************************************************************/ | |
164 | ||
165 | acpi_status | |
4be44fcd LB |
166 | acpi_evaluate_object(acpi_handle handle, |
167 | acpi_string pathname, | |
168 | struct acpi_object_list *external_params, | |
169 | struct acpi_buffer *return_buffer) | |
1da177e4 | 170 | { |
4be44fcd LB |
171 | acpi_status status; |
172 | acpi_status status2; | |
173 | struct acpi_parameter_info info; | |
174 | acpi_size buffer_space_needed; | |
175 | u32 i; | |
1da177e4 | 176 | |
4be44fcd | 177 | ACPI_FUNCTION_TRACE("acpi_evaluate_object"); |
1da177e4 LT |
178 | |
179 | info.node = handle; | |
180 | info.parameters = NULL; | |
181 | info.return_object = NULL; | |
182 | info.parameter_type = ACPI_PARAM_ARGS; | |
183 | ||
184 | /* | |
185 | * If there are parameters to be passed to the object | |
186 | * (which must be a control method), the external objects | |
187 | * must be converted to internal objects | |
188 | */ | |
189 | if (external_params && external_params->count) { | |
190 | /* | |
191 | * Allocate a new parameter block for the internal objects | |
192 | * Add 1 to count to allow for null terminated internal list | |
193 | */ | |
4be44fcd LB |
194 | info.parameters = ACPI_MEM_CALLOCATE(((acpi_size) |
195 | external_params->count + | |
196 | 1) * sizeof(void *)); | |
1da177e4 | 197 | if (!info.parameters) { |
4be44fcd | 198 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
199 | } |
200 | ||
201 | /* | |
202 | * Convert each external object in the list to an | |
203 | * internal object | |
204 | */ | |
205 | for (i = 0; i < external_params->count; i++) { | |
4be44fcd LB |
206 | status = |
207 | acpi_ut_copy_eobject_to_iobject(&external_params-> | |
208 | pointer[i], | |
209 | &info. | |
210 | parameters[i]); | |
211 | if (ACPI_FAILURE(status)) { | |
212 | acpi_ut_delete_internal_object_list(info. | |
213 | parameters); | |
214 | return_ACPI_STATUS(status); | |
1da177e4 LT |
215 | } |
216 | } | |
217 | info.parameters[external_params->count] = NULL; | |
218 | } | |
219 | ||
1da177e4 LT |
220 | /* |
221 | * Three major cases: | |
222 | * 1) Fully qualified pathname | |
223 | * 2) No handle, not fully qualified pathname (error) | |
224 | * 3) Valid handle | |
225 | */ | |
4be44fcd | 226 | if ((pathname) && (acpi_ns_valid_root_prefix(pathname[0]))) { |
1da177e4 LT |
227 | /* |
228 | * The path is fully qualified, just evaluate by name | |
229 | */ | |
4be44fcd LB |
230 | status = acpi_ns_evaluate_by_name(pathname, &info); |
231 | } else if (!handle) { | |
1da177e4 LT |
232 | /* |
233 | * A handle is optional iff a fully qualified pathname | |
234 | * is specified. Since we've already handled fully | |
235 | * qualified names above, this is an error | |
236 | */ | |
237 | if (!pathname) { | |
4a90c7e8 | 238 | ACPI_REPORT_ERROR(("Both Handle and Pathname are NULL\n")); |
4be44fcd | 239 | } else { |
4a90c7e8 | 240 | ACPI_REPORT_ERROR(("Handle is NULL and Pathname is relative\n")); |
1da177e4 LT |
241 | } |
242 | ||
243 | status = AE_BAD_PARAMETER; | |
4be44fcd | 244 | } else { |
1da177e4 LT |
245 | /* |
246 | * We get here if we have a handle -- and if we have a | |
247 | * pathname it is relative. The handle will be validated | |
248 | * in the lower procedures | |
249 | */ | |
250 | if (!pathname) { | |
251 | /* | |
252 | * The null pathname case means the handle is for | |
253 | * the actual object to be evaluated | |
254 | */ | |
4be44fcd LB |
255 | status = acpi_ns_evaluate_by_handle(&info); |
256 | } else { | |
257 | /* | |
258 | * Both a Handle and a relative Pathname | |
259 | */ | |
260 | status = acpi_ns_evaluate_relative(pathname, &info); | |
1da177e4 LT |
261 | } |
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) { | |
269 | if (!info.return_object) { | |
270 | return_buffer->length = 0; | |
4be44fcd LB |
271 | } else { |
272 | if (ACPI_GET_DESCRIPTOR_TYPE(info.return_object) == | |
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; | |
4be44fcd | 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)) { |
1da177e4 LT |
288 | /* |
289 | * Find out how large a buffer is needed | |
290 | * to contain the returned object | |
291 | */ | |
4be44fcd LB |
292 | status = |
293 | acpi_ut_get_object_size(info.return_object, | |
294 | &buffer_space_needed); | |
295 | if (ACPI_SUCCESS(status)) { | |
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 LT |
303 | /* |
304 | * Caller's buffer is too small or a new one can't be allocated | |
305 | */ | |
4be44fcd LB |
306 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
307 | "Needed buffer size %X, %s\n", | |
308 | (u32) | |
309 | buffer_space_needed, | |
310 | acpi_format_exception | |
311 | (status))); | |
312 | } else { | |
1da177e4 LT |
313 | /* |
314 | * We have enough space for the object, build it | |
315 | */ | |
4be44fcd LB |
316 | status = |
317 | acpi_ut_copy_iobject_to_eobject | |
318 | (info.return_object, | |
319 | return_buffer); | |
1da177e4 LT |
320 | } |
321 | } | |
322 | } | |
323 | } | |
324 | } | |
325 | ||
326 | if (info.return_object) { | |
327 | /* | |
328 | * Delete the internal return object. NOTE: Interpreter | |
329 | * must be locked to avoid race condition. | |
330 | */ | |
4be44fcd LB |
331 | status2 = acpi_ex_enter_interpreter(); |
332 | if (ACPI_SUCCESS(status2)) { | |
1da177e4 LT |
333 | /* |
334 | * Delete the internal return object. (Or at least | |
335 | * decrement the reference count by one) | |
336 | */ | |
4be44fcd LB |
337 | acpi_ut_remove_reference(info.return_object); |
338 | acpi_ex_exit_interpreter(); | |
1da177e4 LT |
339 | } |
340 | } | |
341 | ||
342 | /* | |
343 | * Free the input parameter list (if we created one), | |
344 | */ | |
345 | if (info.parameters) { | |
346 | /* Free the allocated parameter block */ | |
347 | ||
4be44fcd | 348 | acpi_ut_delete_internal_object_list(info.parameters); |
1da177e4 LT |
349 | } |
350 | ||
4be44fcd | 351 | return_ACPI_STATUS(status); |
1da177e4 | 352 | } |
1da177e4 | 353 | |
4be44fcd | 354 | 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 | ******************************************************************************/ | |
385 | ||
386 | acpi_status | |
4be44fcd LB |
387 | acpi_walk_namespace(acpi_object_type type, |
388 | acpi_handle start_object, | |
389 | u32 max_depth, | |
390 | acpi_walk_callback user_function, | |
391 | void *context, void **return_value) | |
1da177e4 | 392 | { |
4be44fcd | 393 | acpi_status status; |
1da177e4 | 394 | |
4be44fcd | 395 | ACPI_FUNCTION_TRACE("acpi_walk_namespace"); |
1da177e4 LT |
396 | |
397 | /* Parameter validation */ | |
398 | ||
96db255c | 399 | if ((type > ACPI_TYPE_LOCAL_MAX) || (!max_depth) || (!user_function)) { |
4be44fcd | 400 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
401 | } |
402 | ||
403 | /* | |
404 | * Lock the namespace around the walk. | |
405 | * The namespace will be unlocked/locked around each call | |
406 | * to the user function - since this function | |
407 | * must be allowed to make Acpi calls itself. | |
408 | */ | |
4be44fcd LB |
409 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
410 | if (ACPI_FAILURE(status)) { | |
411 | return_ACPI_STATUS(status); | |
1da177e4 LT |
412 | } |
413 | ||
4be44fcd LB |
414 | status = acpi_ns_walk_namespace(type, start_object, max_depth, |
415 | ACPI_NS_WALK_UNLOCK, | |
416 | user_function, context, return_value); | |
1da177e4 | 417 | |
4be44fcd LB |
418 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
419 | return_ACPI_STATUS(status); | |
1da177e4 | 420 | } |
1da177e4 | 421 | |
4be44fcd | 422 | EXPORT_SYMBOL(acpi_walk_namespace); |
1da177e4 LT |
423 | |
424 | /******************************************************************************* | |
425 | * | |
426 | * FUNCTION: acpi_ns_get_device_callback | |
427 | * | |
428 | * PARAMETERS: Callback from acpi_get_device | |
429 | * | |
430 | * RETURN: Status | |
431 | * | |
432 | * DESCRIPTION: Takes callbacks from walk_namespace and filters out all non- | |
433 | * present devices, or if they specified a HID, it filters based | |
434 | * on that. | |
435 | * | |
436 | ******************************************************************************/ | |
437 | ||
438 | static acpi_status | |
4be44fcd LB |
439 | acpi_ns_get_device_callback(acpi_handle obj_handle, |
440 | u32 nesting_level, | |
441 | void *context, void **return_value) | |
1da177e4 | 442 | { |
4be44fcd LB |
443 | struct acpi_get_devices_info *info = context; |
444 | acpi_status status; | |
445 | struct acpi_namespace_node *node; | |
446 | u32 flags; | |
447 | struct acpi_device_id hid; | |
1da177e4 | 448 | struct acpi_compatible_id_list *cid; |
4be44fcd | 449 | acpi_native_uint i; |
1da177e4 | 450 | |
4be44fcd LB |
451 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
452 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
453 | return (status); |
454 | } | |
455 | ||
4be44fcd LB |
456 | node = acpi_ns_map_handle_to_node(obj_handle); |
457 | status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
458 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
459 | return (status); |
460 | } | |
461 | ||
462 | if (!node) { | |
463 | return (AE_BAD_PARAMETER); | |
464 | } | |
465 | ||
466 | /* Run _STA to determine if device is present */ | |
467 | ||
4be44fcd LB |
468 | status = acpi_ut_execute_STA(node, &flags); |
469 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
470 | return (AE_CTRL_DEPTH); |
471 | } | |
472 | ||
defba1d8 BM |
473 | if (!(flags & ACPI_STA_DEVICE_PRESENT)) { |
474 | /* Don't examine children of the device if not present */ | |
1da177e4 LT |
475 | |
476 | return (AE_CTRL_DEPTH); | |
477 | } | |
478 | ||
479 | /* Filter based on device HID & CID */ | |
480 | ||
481 | if (info->hid != NULL) { | |
4be44fcd | 482 | status = acpi_ut_execute_HID(node, &hid); |
1da177e4 LT |
483 | if (status == AE_NOT_FOUND) { |
484 | return (AE_OK); | |
4be44fcd | 485 | } else if (ACPI_FAILURE(status)) { |
1da177e4 LT |
486 | return (AE_CTRL_DEPTH); |
487 | } | |
488 | ||
4be44fcd | 489 | if (ACPI_STRNCMP(hid.value, info->hid, sizeof(hid.value)) != 0) { |
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) { | |
506 | ACPI_MEM_FREE(cid); | |
1da177e4 LT |
507 | return (AE_OK); |
508 | } | |
509 | } | |
4be44fcd | 510 | ACPI_MEM_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 | |
4be44fcd | 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 | */ | |
4be44fcd | 564 | info.context = context; |
1da177e4 | 565 | info.user_function = user_function; |
4be44fcd | 566 | info.hid = HID; |
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 | ||
4be44fcd LB |
579 | status = acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, |
580 | ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, | |
581 | ACPI_NS_WALK_UNLOCK, | |
582 | acpi_ns_get_device_callback, &info, | |
583 | return_value); | |
1da177e4 | 584 | |
4be44fcd LB |
585 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
586 | return_ACPI_STATUS(status); | |
1da177e4 | 587 | } |
1da177e4 | 588 | |
4be44fcd | 589 | EXPORT_SYMBOL(acpi_get_devices); |
1da177e4 LT |
590 | |
591 | /******************************************************************************* | |
592 | * | |
593 | * FUNCTION: acpi_attach_data | |
594 | * | |
595 | * PARAMETERS: obj_handle - Namespace node | |
596 | * Handler - Handler for this attachment | |
597 | * Data - Pointer to data to be attached | |
598 | * | |
599 | * RETURN: Status | |
600 | * | |
601 | * DESCRIPTION: Attach arbitrary data and handler to a namespace node. | |
602 | * | |
603 | ******************************************************************************/ | |
604 | ||
605 | acpi_status | |
4be44fcd LB |
606 | acpi_attach_data(acpi_handle obj_handle, |
607 | acpi_object_handler handler, void *data) | |
1da177e4 | 608 | { |
4be44fcd LB |
609 | struct acpi_namespace_node *node; |
610 | acpi_status status; | |
1da177e4 LT |
611 | |
612 | /* Parameter validation */ | |
613 | ||
4be44fcd | 614 | if (!obj_handle || !handler || !data) { |
1da177e4 LT |
615 | return (AE_BAD_PARAMETER); |
616 | } | |
617 | ||
4be44fcd LB |
618 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
619 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
620 | return (status); |
621 | } | |
622 | ||
623 | /* Convert and validate the handle */ | |
624 | ||
4be44fcd | 625 | node = acpi_ns_map_handle_to_node(obj_handle); |
1da177e4 LT |
626 | if (!node) { |
627 | status = AE_BAD_PARAMETER; | |
628 | goto unlock_and_exit; | |
629 | } | |
630 | ||
4be44fcd | 631 | status = acpi_ns_attach_data(node, handler, data); |
1da177e4 | 632 | |
4be44fcd LB |
633 | unlock_and_exit: |
634 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
1da177e4 LT |
635 | return (status); |
636 | } | |
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 | ******************************************************************************/ | |
650 | ||
651 | acpi_status | |
4be44fcd | 652 | acpi_detach_data(acpi_handle obj_handle, acpi_object_handler handler) |
1da177e4 | 653 | { |
4be44fcd LB |
654 | struct acpi_namespace_node *node; |
655 | acpi_status status; | |
1da177e4 LT |
656 | |
657 | /* Parameter validation */ | |
658 | ||
4be44fcd | 659 | if (!obj_handle || !handler) { |
1da177e4 LT |
660 | return (AE_BAD_PARAMETER); |
661 | } | |
662 | ||
4be44fcd LB |
663 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
664 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
665 | return (status); |
666 | } | |
667 | ||
668 | /* Convert and validate the handle */ | |
669 | ||
4be44fcd | 670 | node = acpi_ns_map_handle_to_node(obj_handle); |
1da177e4 LT |
671 | if (!node) { |
672 | status = AE_BAD_PARAMETER; | |
673 | goto unlock_and_exit; | |
674 | } | |
675 | ||
4be44fcd | 676 | status = acpi_ns_detach_data(node, handler); |
1da177e4 | 677 | |
4be44fcd LB |
678 | unlock_and_exit: |
679 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
1da177e4 LT |
680 | return (status); |
681 | } | |
682 | ||
1da177e4 LT |
683 | /******************************************************************************* |
684 | * | |
685 | * FUNCTION: acpi_get_data | |
686 | * | |
687 | * PARAMETERS: obj_handle - Namespace node | |
688 | * Handler - Handler used in call to attach_data | |
689 | * Data - Where the data is returned | |
690 | * | |
691 | * RETURN: Status | |
692 | * | |
693 | * DESCRIPTION: Retrieve data that was previously attached to a namespace node. | |
694 | * | |
695 | ******************************************************************************/ | |
696 | ||
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 | } |