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Merge branch 'for-john' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211
[deliverable/linux.git] / drivers / acpi / acpica / evxface.c
1 /******************************************************************************
2 *
3 * Module Name: evxface - External interfaces for ACPI events
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2012, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44 #include <linux/export.h>
45 #include <acpi/acpi.h>
46 #include "accommon.h"
47 #include "acnamesp.h"
48 #include "acevents.h"
49 #include "acinterp.h"
50
51 #define _COMPONENT ACPI_EVENTS
52 ACPI_MODULE_NAME("evxface")
53
54
55 /*******************************************************************************
56 *
57 * FUNCTION: acpi_install_notify_handler
58 *
59 * PARAMETERS: Device - The device for which notifies will be handled
60 * handler_type - The type of handler:
61 * ACPI_SYSTEM_NOTIFY: System Handler (00-7F)
62 * ACPI_DEVICE_NOTIFY: Device Handler (80-FF)
63 * ACPI_ALL_NOTIFY: Both System and Device
64 * Handler - Address of the handler
65 * Context - Value passed to the handler on each GPE
66 *
67 * RETURN: Status
68 *
69 * DESCRIPTION: Install a handler for notifications on an ACPI Device,
70 * thermal_zone, or Processor object.
71 *
72 * NOTES: The Root namespace object may have only one handler for each
73 * type of notify (System/Device). Device/Thermal/Processor objects
74 * may have one device notify handler, and multiple system notify
75 * handlers.
76 *
77 ******************************************************************************/
78 acpi_status
79 acpi_install_notify_handler(acpi_handle device,
80 u32 handler_type,
81 acpi_notify_handler handler, void *context)
82 {
83 struct acpi_namespace_node *node =
84 ACPI_CAST_PTR(struct acpi_namespace_node, device);
85 union acpi_operand_object *obj_desc;
86 union acpi_operand_object *handler_obj;
87 acpi_status status;
88 u32 i;
89
90 ACPI_FUNCTION_TRACE(acpi_install_notify_handler);
91
92 /* Parameter validation */
93
94 if ((!device) || (!handler) || (!handler_type) ||
95 (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
96 return_ACPI_STATUS(AE_BAD_PARAMETER);
97 }
98
99 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
100 if (ACPI_FAILURE(status)) {
101 return_ACPI_STATUS(status);
102 }
103
104 /*
105 * Root Object:
106 * Registering a notify handler on the root object indicates that the
107 * caller wishes to receive notifications for all objects. Note that
108 * only one global handler can be registered per notify type.
109 * Ensure that a handler is not already installed.
110 */
111 if (device == ACPI_ROOT_OBJECT) {
112 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
113 if (handler_type & (i + 1)) {
114 if (acpi_gbl_global_notify[i].handler) {
115 status = AE_ALREADY_EXISTS;
116 goto unlock_and_exit;
117 }
118
119 acpi_gbl_global_notify[i].handler = handler;
120 acpi_gbl_global_notify[i].context = context;
121 }
122 }
123
124 goto unlock_and_exit; /* Global notify handler installed, all done */
125 }
126
127 /*
128 * All Other Objects:
129 * Caller will only receive notifications specific to the target
130 * object. Note that only certain object types are allowed to
131 * receive notifications.
132 */
133
134 /* Are Notifies allowed on this object? */
135
136 if (!acpi_ev_is_notify_object(node)) {
137 status = AE_TYPE;
138 goto unlock_and_exit;
139 }
140
141 /* Check for an existing internal object, might not exist */
142
143 obj_desc = acpi_ns_get_attached_object(node);
144 if (!obj_desc) {
145
146 /* Create a new object */
147
148 obj_desc = acpi_ut_create_internal_object(node->type);
149 if (!obj_desc) {
150 status = AE_NO_MEMORY;
151 goto unlock_and_exit;
152 }
153
154 /* Attach new object to the Node, remove local reference */
155
156 status = acpi_ns_attach_object(device, obj_desc, node->type);
157 acpi_ut_remove_reference(obj_desc);
158 if (ACPI_FAILURE(status)) {
159 goto unlock_and_exit;
160 }
161 }
162
163 /* Ensure that the handler is not already installed in the lists */
164
165 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
166 if (handler_type & (i + 1)) {
167 handler_obj = obj_desc->common_notify.notify_list[i];
168 while (handler_obj) {
169 if (handler_obj->notify.handler == handler) {
170 status = AE_ALREADY_EXISTS;
171 goto unlock_and_exit;
172 }
173
174 handler_obj = handler_obj->notify.next[i];
175 }
176 }
177 }
178
179 /* Create and populate a new notify handler object */
180
181 handler_obj = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_NOTIFY);
182 if (!handler_obj) {
183 status = AE_NO_MEMORY;
184 goto unlock_and_exit;
185 }
186
187 handler_obj->notify.node = node;
188 handler_obj->notify.handler_type = handler_type;
189 handler_obj->notify.handler = handler;
190 handler_obj->notify.context = context;
191
192 /* Install the handler at the list head(s) */
193
194 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
195 if (handler_type & (i + 1)) {
196 handler_obj->notify.next[i] =
197 obj_desc->common_notify.notify_list[i];
198
199 obj_desc->common_notify.notify_list[i] = handler_obj;
200 }
201 }
202
203 /* Add an extra reference if handler was installed in both lists */
204
205 if (handler_type == ACPI_ALL_NOTIFY) {
206 acpi_ut_add_reference(handler_obj);
207 }
208
209 unlock_and_exit:
210 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
211 return_ACPI_STATUS(status);
212 }
213
214 ACPI_EXPORT_SYMBOL(acpi_install_notify_handler)
215
216 /*******************************************************************************
217 *
218 * FUNCTION: acpi_remove_notify_handler
219 *
220 * PARAMETERS: Device - The device for which the handler is installed
221 * handler_type - The type of handler:
222 * ACPI_SYSTEM_NOTIFY: System Handler (00-7F)
223 * ACPI_DEVICE_NOTIFY: Device Handler (80-FF)
224 * ACPI_ALL_NOTIFY: Both System and Device
225 * Handler - Address of the handler
226 *
227 * RETURN: Status
228 *
229 * DESCRIPTION: Remove a handler for notifies on an ACPI device
230 *
231 ******************************************************************************/
232 acpi_status
233 acpi_remove_notify_handler(acpi_handle device,
234 u32 handler_type, acpi_notify_handler handler)
235 {
236 struct acpi_namespace_node *node =
237 ACPI_CAST_PTR(struct acpi_namespace_node, device);
238 union acpi_operand_object *obj_desc;
239 union acpi_operand_object *handler_obj;
240 union acpi_operand_object *previous_handler_obj;
241 acpi_status status;
242 u32 i;
243
244 ACPI_FUNCTION_TRACE(acpi_remove_notify_handler);
245
246 /* Parameter validation */
247
248 if ((!device) || (!handler) || (!handler_type) ||
249 (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
250 return_ACPI_STATUS(AE_BAD_PARAMETER);
251 }
252 /* Make sure all deferred tasks are completed */
253
254 acpi_os_wait_events_complete();
255
256 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
257 if (ACPI_FAILURE(status)) {
258 return_ACPI_STATUS(status);
259 }
260
261 /* Root Object. Global handlers are removed here */
262
263 if (device == ACPI_ROOT_OBJECT) {
264 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
265 if (handler_type & (i + 1)) {
266 if (!acpi_gbl_global_notify[i].handler ||
267 (acpi_gbl_global_notify[i].handler !=
268 handler)) {
269 status = AE_NOT_EXIST;
270 goto unlock_and_exit;
271 }
272
273 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
274 "Removing global notify handler\n"));
275
276 acpi_gbl_global_notify[i].handler = NULL;
277 acpi_gbl_global_notify[i].context = NULL;
278 }
279 }
280
281 goto unlock_and_exit;
282 }
283
284 /* All other objects: Are Notifies allowed on this object? */
285
286 if (!acpi_ev_is_notify_object(node)) {
287 status = AE_TYPE;
288 goto unlock_and_exit;
289 }
290
291 /* Must have an existing internal object */
292
293 obj_desc = acpi_ns_get_attached_object(node);
294 if (!obj_desc) {
295 status = AE_NOT_EXIST;
296 goto unlock_and_exit;
297 }
298
299 /* Internal object exists. Find the handler and remove it */
300
301 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
302 if (handler_type & (i + 1)) {
303 handler_obj = obj_desc->common_notify.notify_list[i];
304 previous_handler_obj = NULL;
305
306 /* Attempt to find the handler in the handler list */
307
308 while (handler_obj &&
309 (handler_obj->notify.handler != handler)) {
310 previous_handler_obj = handler_obj;
311 handler_obj = handler_obj->notify.next[i];
312 }
313
314 if (!handler_obj) {
315 status = AE_NOT_EXIST;
316 goto unlock_and_exit;
317 }
318
319 /* Remove the handler object from the list */
320
321 if (previous_handler_obj) { /* Handler is not at the list head */
322 previous_handler_obj->notify.next[i] =
323 handler_obj->notify.next[i];
324 } else { /* Handler is at the list head */
325
326 obj_desc->common_notify.notify_list[i] =
327 handler_obj->notify.next[i];
328 }
329
330 acpi_ut_remove_reference(handler_obj);
331 }
332 }
333
334 unlock_and_exit:
335 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
336 return_ACPI_STATUS(status);
337 }
338
339 ACPI_EXPORT_SYMBOL(acpi_remove_notify_handler)
340
341 /*******************************************************************************
342 *
343 * FUNCTION: acpi_install_exception_handler
344 *
345 * PARAMETERS: handler - Pointer to the handler function for the
346 * event
347 *
348 * RETURN: Status
349 *
350 * DESCRIPTION: Saves the pointer to the handler function
351 *
352 ******************************************************************************/
353 #ifdef ACPI_FUTURE_USAGE
354 acpi_status acpi_install_exception_handler(acpi_exception_handler handler)
355 {
356 acpi_status status;
357
358 ACPI_FUNCTION_TRACE(acpi_install_exception_handler);
359
360 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
361 if (ACPI_FAILURE(status)) {
362 return_ACPI_STATUS(status);
363 }
364
365 /* Don't allow two handlers. */
366
367 if (acpi_gbl_exception_handler) {
368 status = AE_ALREADY_EXISTS;
369 goto cleanup;
370 }
371
372 /* Install the handler */
373
374 acpi_gbl_exception_handler = handler;
375
376 cleanup:
377 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
378 return_ACPI_STATUS(status);
379 }
380
381 ACPI_EXPORT_SYMBOL(acpi_install_exception_handler)
382 #endif /* ACPI_FUTURE_USAGE */
383
384 #if (!ACPI_REDUCED_HARDWARE)
385 /*******************************************************************************
386 *
387 * FUNCTION: acpi_install_global_event_handler
388 *
389 * PARAMETERS: handler - Pointer to the global event handler function
390 * context - Value passed to the handler on each event
391 *
392 * RETURN: Status
393 *
394 * DESCRIPTION: Saves the pointer to the handler function. The global handler
395 * is invoked upon each incoming GPE and Fixed Event. It is
396 * invoked at interrupt level at the time of the event dispatch.
397 * Can be used to update event counters, etc.
398 *
399 ******************************************************************************/
400 acpi_status
401 acpi_install_global_event_handler(ACPI_GBL_EVENT_HANDLER handler, void *context)
402 {
403 acpi_status status;
404
405 ACPI_FUNCTION_TRACE(acpi_install_global_event_handler);
406
407 /* Parameter validation */
408
409 if (!handler) {
410 return_ACPI_STATUS(AE_BAD_PARAMETER);
411 }
412
413 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
414 if (ACPI_FAILURE(status)) {
415 return_ACPI_STATUS(status);
416 }
417
418 /* Don't allow two handlers. */
419
420 if (acpi_gbl_global_event_handler) {
421 status = AE_ALREADY_EXISTS;
422 goto cleanup;
423 }
424
425 acpi_gbl_global_event_handler = handler;
426 acpi_gbl_global_event_handler_context = context;
427
428 cleanup:
429 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
430 return_ACPI_STATUS(status);
431 }
432
433 ACPI_EXPORT_SYMBOL(acpi_install_global_event_handler)
434
435 /*******************************************************************************
436 *
437 * FUNCTION: acpi_install_fixed_event_handler
438 *
439 * PARAMETERS: event - Event type to enable.
440 * handler - Pointer to the handler function for the
441 * event
442 * context - Value passed to the handler on each GPE
443 *
444 * RETURN: Status
445 *
446 * DESCRIPTION: Saves the pointer to the handler function and then enables the
447 * event.
448 *
449 ******************************************************************************/
450 acpi_status
451 acpi_install_fixed_event_handler(u32 event,
452 acpi_event_handler handler, void *context)
453 {
454 acpi_status status;
455
456 ACPI_FUNCTION_TRACE(acpi_install_fixed_event_handler);
457
458 /* Parameter validation */
459
460 if (event > ACPI_EVENT_MAX) {
461 return_ACPI_STATUS(AE_BAD_PARAMETER);
462 }
463
464 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
465 if (ACPI_FAILURE(status)) {
466 return_ACPI_STATUS(status);
467 }
468
469 /* Don't allow two handlers. */
470
471 if (NULL != acpi_gbl_fixed_event_handlers[event].handler) {
472 status = AE_ALREADY_EXISTS;
473 goto cleanup;
474 }
475
476 /* Install the handler before enabling the event */
477
478 acpi_gbl_fixed_event_handlers[event].handler = handler;
479 acpi_gbl_fixed_event_handlers[event].context = context;
480
481 status = acpi_clear_event(event);
482 if (ACPI_SUCCESS(status))
483 status = acpi_enable_event(event, 0);
484 if (ACPI_FAILURE(status)) {
485 ACPI_WARNING((AE_INFO, "Could not enable fixed event 0x%X",
486 event));
487
488 /* Remove the handler */
489
490 acpi_gbl_fixed_event_handlers[event].handler = NULL;
491 acpi_gbl_fixed_event_handlers[event].context = NULL;
492 } else {
493 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
494 "Enabled fixed event %X, Handler=%p\n", event,
495 handler));
496 }
497
498 cleanup:
499 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
500 return_ACPI_STATUS(status);
501 }
502
503 ACPI_EXPORT_SYMBOL(acpi_install_fixed_event_handler)
504
505 /*******************************************************************************
506 *
507 * FUNCTION: acpi_remove_fixed_event_handler
508 *
509 * PARAMETERS: event - Event type to disable.
510 * handler - Address of the handler
511 *
512 * RETURN: Status
513 *
514 * DESCRIPTION: Disables the event and unregisters the event handler.
515 *
516 ******************************************************************************/
517 acpi_status
518 acpi_remove_fixed_event_handler(u32 event, acpi_event_handler handler)
519 {
520 acpi_status status = AE_OK;
521
522 ACPI_FUNCTION_TRACE(acpi_remove_fixed_event_handler);
523
524 /* Parameter validation */
525
526 if (event > ACPI_EVENT_MAX) {
527 return_ACPI_STATUS(AE_BAD_PARAMETER);
528 }
529
530 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
531 if (ACPI_FAILURE(status)) {
532 return_ACPI_STATUS(status);
533 }
534
535 /* Disable the event before removing the handler */
536
537 status = acpi_disable_event(event, 0);
538
539 /* Always Remove the handler */
540
541 acpi_gbl_fixed_event_handlers[event].handler = NULL;
542 acpi_gbl_fixed_event_handlers[event].context = NULL;
543
544 if (ACPI_FAILURE(status)) {
545 ACPI_WARNING((AE_INFO,
546 "Could not write to fixed event enable register 0x%X",
547 event));
548 } else {
549 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Disabled fixed event %X\n",
550 event));
551 }
552
553 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
554 return_ACPI_STATUS(status);
555 }
556
557 ACPI_EXPORT_SYMBOL(acpi_remove_fixed_event_handler)
558
559 /*******************************************************************************
560 *
561 * FUNCTION: acpi_install_gpe_handler
562 *
563 * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT
564 * defined GPEs)
565 * gpe_number - The GPE number within the GPE block
566 * type - Whether this GPE should be treated as an
567 * edge- or level-triggered interrupt.
568 * address - Address of the handler
569 * context - Value passed to the handler on each GPE
570 *
571 * RETURN: Status
572 *
573 * DESCRIPTION: Install a handler for a General Purpose Event.
574 *
575 ******************************************************************************/
576 acpi_status
577 acpi_install_gpe_handler(acpi_handle gpe_device,
578 u32 gpe_number,
579 u32 type, acpi_gpe_handler address, void *context)
580 {
581 struct acpi_gpe_event_info *gpe_event_info;
582 struct acpi_gpe_handler_info *handler;
583 acpi_status status;
584 acpi_cpu_flags flags;
585
586 ACPI_FUNCTION_TRACE(acpi_install_gpe_handler);
587
588 /* Parameter validation */
589
590 if ((!address) || (type & ~ACPI_GPE_XRUPT_TYPE_MASK)) {
591 return_ACPI_STATUS(AE_BAD_PARAMETER);
592 }
593
594 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
595 if (ACPI_FAILURE(status)) {
596 return_ACPI_STATUS(status);
597 }
598
599 /* Allocate memory for the handler object */
600
601 handler = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_handler_info));
602 if (!handler) {
603 status = AE_NO_MEMORY;
604 goto unlock_and_exit;
605 }
606
607 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
608
609 /* Ensure that we have a valid GPE number */
610
611 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
612 if (!gpe_event_info) {
613 status = AE_BAD_PARAMETER;
614 goto free_and_exit;
615 }
616
617 /* Make sure that there isn't a handler there already */
618
619 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
620 ACPI_GPE_DISPATCH_HANDLER) {
621 status = AE_ALREADY_EXISTS;
622 goto free_and_exit;
623 }
624
625 /* Allocate and init handler object */
626
627 handler->address = address;
628 handler->context = context;
629 handler->method_node = gpe_event_info->dispatch.method_node;
630 handler->original_flags = gpe_event_info->flags &
631 (ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
632
633 /*
634 * If the GPE is associated with a method, it might have been enabled
635 * automatically during initialization, in which case it has to be
636 * disabled now to avoid spurious execution of the handler.
637 */
638
639 if ((handler->original_flags & ACPI_GPE_DISPATCH_METHOD)
640 && gpe_event_info->runtime_count) {
641 handler->originally_enabled = 1;
642 (void)acpi_ev_remove_gpe_reference(gpe_event_info);
643 }
644
645 /* Install the handler */
646
647 gpe_event_info->dispatch.handler = handler;
648
649 /* Setup up dispatch flags to indicate handler (vs. method) */
650
651 gpe_event_info->flags &=
652 ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
653 gpe_event_info->flags |= (u8) (type | ACPI_GPE_DISPATCH_HANDLER);
654
655 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
656
657 unlock_and_exit:
658 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
659 return_ACPI_STATUS(status);
660
661 free_and_exit:
662 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
663 ACPI_FREE(handler);
664 goto unlock_and_exit;
665 }
666
667 ACPI_EXPORT_SYMBOL(acpi_install_gpe_handler)
668
669 /*******************************************************************************
670 *
671 * FUNCTION: acpi_remove_gpe_handler
672 *
673 * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT
674 * defined GPEs)
675 * gpe_number - The event to remove a handler
676 * address - Address of the handler
677 *
678 * RETURN: Status
679 *
680 * DESCRIPTION: Remove a handler for a General Purpose acpi_event.
681 *
682 ******************************************************************************/
683 acpi_status
684 acpi_remove_gpe_handler(acpi_handle gpe_device,
685 u32 gpe_number, acpi_gpe_handler address)
686 {
687 struct acpi_gpe_event_info *gpe_event_info;
688 struct acpi_gpe_handler_info *handler;
689 acpi_status status;
690 acpi_cpu_flags flags;
691
692 ACPI_FUNCTION_TRACE(acpi_remove_gpe_handler);
693
694 /* Parameter validation */
695
696 if (!address) {
697 return_ACPI_STATUS(AE_BAD_PARAMETER);
698 }
699
700 /* Make sure all deferred tasks are completed */
701
702 acpi_os_wait_events_complete();
703
704 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
705 if (ACPI_FAILURE(status)) {
706 return_ACPI_STATUS(status);
707 }
708
709 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
710
711 /* Ensure that we have a valid GPE number */
712
713 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
714 if (!gpe_event_info) {
715 status = AE_BAD_PARAMETER;
716 goto unlock_and_exit;
717 }
718
719 /* Make sure that a handler is indeed installed */
720
721 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) !=
722 ACPI_GPE_DISPATCH_HANDLER) {
723 status = AE_NOT_EXIST;
724 goto unlock_and_exit;
725 }
726
727 /* Make sure that the installed handler is the same */
728
729 if (gpe_event_info->dispatch.handler->address != address) {
730 status = AE_BAD_PARAMETER;
731 goto unlock_and_exit;
732 }
733
734 /* Remove the handler */
735
736 handler = gpe_event_info->dispatch.handler;
737
738 /* Restore Method node (if any), set dispatch flags */
739
740 gpe_event_info->dispatch.method_node = handler->method_node;
741 gpe_event_info->flags &=
742 ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
743 gpe_event_info->flags |= handler->original_flags;
744
745 /*
746 * If the GPE was previously associated with a method and it was
747 * enabled, it should be enabled at this point to restore the
748 * post-initialization configuration.
749 */
750
751 if ((handler->original_flags & ACPI_GPE_DISPATCH_METHOD)
752 && handler->originally_enabled)
753 (void)acpi_ev_add_gpe_reference(gpe_event_info);
754
755 /* Now we can free the handler object */
756
757 ACPI_FREE(handler);
758
759 unlock_and_exit:
760 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
761
762 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
763 return_ACPI_STATUS(status);
764 }
765
766 ACPI_EXPORT_SYMBOL(acpi_remove_gpe_handler)
767
768 /*******************************************************************************
769 *
770 * FUNCTION: acpi_acquire_global_lock
771 *
772 * PARAMETERS: timeout - How long the caller is willing to wait
773 * handle - Where the handle to the lock is returned
774 * (if acquired)
775 *
776 * RETURN: Status
777 *
778 * DESCRIPTION: Acquire the ACPI Global Lock
779 *
780 * Note: Allows callers with the same thread ID to acquire the global lock
781 * multiple times. In other words, externally, the behavior of the global lock
782 * is identical to an AML mutex. On the first acquire, a new handle is
783 * returned. On any subsequent calls to acquire by the same thread, the same
784 * handle is returned.
785 *
786 ******************************************************************************/
787 acpi_status acpi_acquire_global_lock(u16 timeout, u32 * handle)
788 {
789 acpi_status status;
790
791 if (!handle) {
792 return (AE_BAD_PARAMETER);
793 }
794
795 /* Must lock interpreter to prevent race conditions */
796
797 acpi_ex_enter_interpreter();
798
799 status = acpi_ex_acquire_mutex_object(timeout,
800 acpi_gbl_global_lock_mutex,
801 acpi_os_get_thread_id());
802
803 if (ACPI_SUCCESS(status)) {
804
805 /* Return the global lock handle (updated in acpi_ev_acquire_global_lock) */
806
807 *handle = acpi_gbl_global_lock_handle;
808 }
809
810 acpi_ex_exit_interpreter();
811 return (status);
812 }
813
814 ACPI_EXPORT_SYMBOL(acpi_acquire_global_lock)
815
816 /*******************************************************************************
817 *
818 * FUNCTION: acpi_release_global_lock
819 *
820 * PARAMETERS: handle - Returned from acpi_acquire_global_lock
821 *
822 * RETURN: Status
823 *
824 * DESCRIPTION: Release the ACPI Global Lock. The handle must be valid.
825 *
826 ******************************************************************************/
827 acpi_status acpi_release_global_lock(u32 handle)
828 {
829 acpi_status status;
830
831 if (!handle || (handle != acpi_gbl_global_lock_handle)) {
832 return (AE_NOT_ACQUIRED);
833 }
834
835 status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex);
836 return (status);
837 }
838
839 ACPI_EXPORT_SYMBOL(acpi_release_global_lock)
840 #endif /* !ACPI_REDUCED_HARDWARE */
Linux kernel - Deliverables
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