1 /******************************************************************************
2 *
3 * Module Name: evxface - External interfaces for ACPI events
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2013, 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
acpi_install_notify_handler(acpi_handle device,u32 handler_type,acpi_notify_handler handler,void * context)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
ACPI_EXPORT_SYMBOL(acpi_install_notify_handler)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
253 /* Make sure all deferred notify tasks are completed */
254
255 acpi_os_wait_events_complete();
256
257 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
258 if (ACPI_FAILURE(status)) {
259 return_ACPI_STATUS(status);
260 }
261
262 /* Root Object. Global handlers are removed here */
263
264 if (device == ACPI_ROOT_OBJECT) {
265 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
266 if (handler_type & (i + 1)) {
267 if (!acpi_gbl_global_notify[i].handler ||
268 (acpi_gbl_global_notify[i].handler !=
269 handler)) {
270 status = AE_NOT_EXIST;
271 goto unlock_and_exit;
272 }
273
274 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
275 "Removing global notify handler\n"));
276
277 acpi_gbl_global_notify[i].handler = NULL;
278 acpi_gbl_global_notify[i].context = NULL;
279 }
280 }
281
282 goto unlock_and_exit;
283 }
284
285 /* All other objects: Are Notifies allowed on this object? */
286
287 if (!acpi_ev_is_notify_object(node)) {
288 status = AE_TYPE;
289 goto unlock_and_exit;
290 }
291
292 /* Must have an existing internal object */
293
294 obj_desc = acpi_ns_get_attached_object(node);
295 if (!obj_desc) {
296 status = AE_NOT_EXIST;
297 goto unlock_and_exit;
298 }
299
300 /* Internal object exists. Find the handler and remove it */
301
302 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
303 if (handler_type & (i + 1)) {
304 handler_obj = obj_desc->common_notify.notify_list[i];
305 previous_handler_obj = NULL;
306
307 /* Attempt to find the handler in the handler list */
308
309 while (handler_obj &&
310 (handler_obj->notify.handler != handler)) {
311 previous_handler_obj = handler_obj;
312 handler_obj = handler_obj->notify.next[i];
313 }
314
315 if (!handler_obj) {
316 status = AE_NOT_EXIST;
317 goto unlock_and_exit;
318 }
319
320 /* Remove the handler object from the list */
321
322 if (previous_handler_obj) { /* Handler is not at the list head */
323 previous_handler_obj->notify.next[i] =
324 handler_obj->notify.next[i];
325 } else { /* Handler is at the list head */
326
327 obj_desc->common_notify.notify_list[i] =
328 handler_obj->notify.next[i];
329 }
330
331 acpi_ut_remove_reference(handler_obj);
332 }
333 }
334
335 unlock_and_exit:
336 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
337 return_ACPI_STATUS(status);
338 }
339
ACPI_EXPORT_SYMBOL(acpi_remove_notify_handler)340 ACPI_EXPORT_SYMBOL(acpi_remove_notify_handler)
341
342 /*******************************************************************************
343 *
344 * FUNCTION: acpi_install_exception_handler
345 *
346 * PARAMETERS: handler - Pointer to the handler function for the
347 * event
348 *
349 * RETURN: Status
350 *
351 * DESCRIPTION: Saves the pointer to the handler function
352 *
353 ******************************************************************************/
354 #ifdef ACPI_FUTURE_USAGE
355 acpi_status acpi_install_exception_handler(acpi_exception_handler handler)
356 {
357 acpi_status status;
358
359 ACPI_FUNCTION_TRACE(acpi_install_exception_handler);
360
361 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
362 if (ACPI_FAILURE(status)) {
363 return_ACPI_STATUS(status);
364 }
365
366 /* Don't allow two handlers. */
367
368 if (acpi_gbl_exception_handler) {
369 status = AE_ALREADY_EXISTS;
370 goto cleanup;
371 }
372
373 /* Install the handler */
374
375 acpi_gbl_exception_handler = handler;
376
377 cleanup:
378 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
379 return_ACPI_STATUS(status);
380 }
381
ACPI_EXPORT_SYMBOL(acpi_install_exception_handler)382 ACPI_EXPORT_SYMBOL(acpi_install_exception_handler)
383 #endif /* ACPI_FUTURE_USAGE */
384
385 #if (!ACPI_REDUCED_HARDWARE)
386 /*******************************************************************************
387 *
388 * FUNCTION: acpi_install_global_event_handler
389 *
390 * PARAMETERS: handler - Pointer to the global event handler function
391 * context - Value passed to the handler on each event
392 *
393 * RETURN: Status
394 *
395 * DESCRIPTION: Saves the pointer to the handler function. The global handler
396 * is invoked upon each incoming GPE and Fixed Event. It is
397 * invoked at interrupt level at the time of the event dispatch.
398 * Can be used to update event counters, etc.
399 *
400 ******************************************************************************/
401 acpi_status
402 acpi_install_global_event_handler(acpi_gbl_event_handler handler, void *context)
403 {
404 acpi_status status;
405
406 ACPI_FUNCTION_TRACE(acpi_install_global_event_handler);
407
408 /* Parameter validation */
409
410 if (!handler) {
411 return_ACPI_STATUS(AE_BAD_PARAMETER);
412 }
413
414 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
415 if (ACPI_FAILURE(status)) {
416 return_ACPI_STATUS(status);
417 }
418
419 /* Don't allow two handlers. */
420
421 if (acpi_gbl_global_event_handler) {
422 status = AE_ALREADY_EXISTS;
423 goto cleanup;
424 }
425
426 acpi_gbl_global_event_handler = handler;
427 acpi_gbl_global_event_handler_context = context;
428
429 cleanup:
430 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
431 return_ACPI_STATUS(status);
432 }
433
ACPI_EXPORT_SYMBOL(acpi_install_global_event_handler)434 ACPI_EXPORT_SYMBOL(acpi_install_global_event_handler)
435
436 /*******************************************************************************
437 *
438 * FUNCTION: acpi_install_fixed_event_handler
439 *
440 * PARAMETERS: event - Event type to enable.
441 * handler - Pointer to the handler function for the
442 * event
443 * context - Value passed to the handler on each GPE
444 *
445 * RETURN: Status
446 *
447 * DESCRIPTION: Saves the pointer to the handler function and then enables the
448 * event.
449 *
450 ******************************************************************************/
451 acpi_status
452 acpi_install_fixed_event_handler(u32 event,
453 acpi_event_handler handler, void *context)
454 {
455 acpi_status status;
456
457 ACPI_FUNCTION_TRACE(acpi_install_fixed_event_handler);
458
459 /* Parameter validation */
460
461 if (event > ACPI_EVENT_MAX) {
462 return_ACPI_STATUS(AE_BAD_PARAMETER);
463 }
464
465 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
466 if (ACPI_FAILURE(status)) {
467 return_ACPI_STATUS(status);
468 }
469
470 /* Do not allow multiple handlers */
471
472 if (acpi_gbl_fixed_event_handlers[event].handler) {
473 status = AE_ALREADY_EXISTS;
474 goto cleanup;
475 }
476
477 /* Install the handler before enabling the event */
478
479 acpi_gbl_fixed_event_handlers[event].handler = handler;
480 acpi_gbl_fixed_event_handlers[event].context = context;
481
482 status = acpi_clear_event(event);
483 if (ACPI_SUCCESS(status))
484 status = acpi_enable_event(event, 0);
485 if (ACPI_FAILURE(status)) {
486 ACPI_WARNING((AE_INFO,
487 "Could not enable fixed event - %s (%u)",
488 acpi_ut_get_event_name(event), event));
489
490 /* Remove the handler */
491
492 acpi_gbl_fixed_event_handlers[event].handler = NULL;
493 acpi_gbl_fixed_event_handlers[event].context = NULL;
494 } else {
495 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
496 "Enabled fixed event %s (%X), Handler=%p\n",
497 acpi_ut_get_event_name(event), event,
498 handler));
499 }
500
501 cleanup:
502 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
503 return_ACPI_STATUS(status);
504 }
505
ACPI_EXPORT_SYMBOL(acpi_install_fixed_event_handler)506 ACPI_EXPORT_SYMBOL(acpi_install_fixed_event_handler)
507
508 /*******************************************************************************
509 *
510 * FUNCTION: acpi_remove_fixed_event_handler
511 *
512 * PARAMETERS: event - Event type to disable.
513 * handler - Address of the handler
514 *
515 * RETURN: Status
516 *
517 * DESCRIPTION: Disables the event and unregisters the event handler.
518 *
519 ******************************************************************************/
520 acpi_status
521 acpi_remove_fixed_event_handler(u32 event, acpi_event_handler handler)
522 {
523 acpi_status status = AE_OK;
524
525 ACPI_FUNCTION_TRACE(acpi_remove_fixed_event_handler);
526
527 /* Parameter validation */
528
529 if (event > ACPI_EVENT_MAX) {
530 return_ACPI_STATUS(AE_BAD_PARAMETER);
531 }
532
533 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
534 if (ACPI_FAILURE(status)) {
535 return_ACPI_STATUS(status);
536 }
537
538 /* Disable the event before removing the handler */
539
540 status = acpi_disable_event(event, 0);
541
542 /* Always Remove the handler */
543
544 acpi_gbl_fixed_event_handlers[event].handler = NULL;
545 acpi_gbl_fixed_event_handlers[event].context = NULL;
546
547 if (ACPI_FAILURE(status)) {
548 ACPI_WARNING((AE_INFO,
549 "Could not disable fixed event - %s (%u)",
550 acpi_ut_get_event_name(event), event));
551 } else {
552 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
553 "Disabled fixed event - %s (%X)\n",
554 acpi_ut_get_event_name(event), event));
555 }
556
557 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
558 return_ACPI_STATUS(status);
559 }
560
ACPI_EXPORT_SYMBOL(acpi_remove_fixed_event_handler)561 ACPI_EXPORT_SYMBOL(acpi_remove_fixed_event_handler)
562
563 /*******************************************************************************
564 *
565 * FUNCTION: acpi_install_gpe_handler
566 *
567 * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT
568 * defined GPEs)
569 * gpe_number - The GPE number within the GPE block
570 * type - Whether this GPE should be treated as an
571 * edge- or level-triggered interrupt.
572 * address - Address of the handler
573 * context - Value passed to the handler on each GPE
574 *
575 * RETURN: Status
576 *
577 * DESCRIPTION: Install a handler for a General Purpose Event.
578 *
579 ******************************************************************************/
580 acpi_status
581 acpi_install_gpe_handler(acpi_handle gpe_device,
582 u32 gpe_number,
583 u32 type, acpi_gpe_handler address, void *context)
584 {
585 struct acpi_gpe_event_info *gpe_event_info;
586 struct acpi_gpe_handler_info *handler;
587 acpi_status status;
588 acpi_cpu_flags flags;
589
590 ACPI_FUNCTION_TRACE(acpi_install_gpe_handler);
591
592 /* Parameter validation */
593
594 if ((!address) || (type & ~ACPI_GPE_XRUPT_TYPE_MASK)) {
595 return_ACPI_STATUS(AE_BAD_PARAMETER);
596 }
597
598 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
599 if (ACPI_FAILURE(status)) {
600 return_ACPI_STATUS(status);
601 }
602
603 /* Allocate and init handler object (before lock) */
604
605 handler = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_handler_info));
606 if (!handler) {
607 status = AE_NO_MEMORY;
608 goto unlock_and_exit;
609 }
610
611 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
612
613 /* Ensure that we have a valid GPE number */
614
615 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
616 if (!gpe_event_info) {
617 status = AE_BAD_PARAMETER;
618 goto free_and_exit;
619 }
620
621 /* Make sure that there isn't a handler there already */
622
623 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
624 ACPI_GPE_DISPATCH_HANDLER) {
625 status = AE_ALREADY_EXISTS;
626 goto free_and_exit;
627 }
628
629 handler->address = address;
630 handler->context = context;
631 handler->method_node = gpe_event_info->dispatch.method_node;
632 handler->original_flags = (u8)(gpe_event_info->flags &
633 (ACPI_GPE_XRUPT_TYPE_MASK |
634 ACPI_GPE_DISPATCH_MASK));
635
636 /*
637 * If the GPE is associated with a method, it may have been enabled
638 * automatically during initialization, in which case it has to be
639 * disabled now to avoid spurious execution of the handler.
640 */
641
642 if ((handler->original_flags & ACPI_GPE_DISPATCH_METHOD)
643 && gpe_event_info->runtime_count) {
644 handler->originally_enabled = 1;
645 (void)acpi_ev_remove_gpe_reference(gpe_event_info);
646 }
647
648 /* Install the handler */
649
650 gpe_event_info->dispatch.handler = handler;
651
652 /* Setup up dispatch flags to indicate handler (vs. method/notify) */
653
654 gpe_event_info->flags &=
655 ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
656 gpe_event_info->flags |= (u8) (type | ACPI_GPE_DISPATCH_HANDLER);
657
658 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
659
660 unlock_and_exit:
661 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
662 return_ACPI_STATUS(status);
663
664 free_and_exit:
665 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
666 ACPI_FREE(handler);
667 goto unlock_and_exit;
668 }
669
ACPI_EXPORT_SYMBOL(acpi_install_gpe_handler)670 ACPI_EXPORT_SYMBOL(acpi_install_gpe_handler)
671
672 /*******************************************************************************
673 *
674 * FUNCTION: acpi_remove_gpe_handler
675 *
676 * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT
677 * defined GPEs)
678 * gpe_number - The event to remove a handler
679 * address - Address of the handler
680 *
681 * RETURN: Status
682 *
683 * DESCRIPTION: Remove a handler for a General Purpose acpi_event.
684 *
685 ******************************************************************************/
686 acpi_status
687 acpi_remove_gpe_handler(acpi_handle gpe_device,
688 u32 gpe_number, acpi_gpe_handler address)
689 {
690 struct acpi_gpe_event_info *gpe_event_info;
691 struct acpi_gpe_handler_info *handler;
692 acpi_status status;
693 acpi_cpu_flags flags;
694
695 ACPI_FUNCTION_TRACE(acpi_remove_gpe_handler);
696
697 /* Parameter validation */
698
699 if (!address) {
700 return_ACPI_STATUS(AE_BAD_PARAMETER);
701 }
702
703 /* Make sure all deferred GPE tasks are completed */
704
705 acpi_os_wait_events_complete();
706
707 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
708 if (ACPI_FAILURE(status)) {
709 return_ACPI_STATUS(status);
710 }
711
712 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
713
714 /* Ensure that we have a valid GPE number */
715
716 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
717 if (!gpe_event_info) {
718 status = AE_BAD_PARAMETER;
719 goto unlock_and_exit;
720 }
721
722 /* Make sure that a handler is indeed installed */
723
724 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) !=
725 ACPI_GPE_DISPATCH_HANDLER) {
726 status = AE_NOT_EXIST;
727 goto unlock_and_exit;
728 }
729
730 /* Make sure that the installed handler is the same */
731
732 if (gpe_event_info->dispatch.handler->address != address) {
733 status = AE_BAD_PARAMETER;
734 goto unlock_and_exit;
735 }
736
737 /* Remove the handler */
738
739 handler = gpe_event_info->dispatch.handler;
740
741 /* Restore Method node (if any), set dispatch flags */
742
743 gpe_event_info->dispatch.method_node = handler->method_node;
744 gpe_event_info->flags &=
745 ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
746 gpe_event_info->flags |= handler->original_flags;
747
748 /*
749 * If the GPE was previously associated with a method and it was
750 * enabled, it should be enabled at this point to restore the
751 * post-initialization configuration.
752 */
753 if ((handler->original_flags & ACPI_GPE_DISPATCH_METHOD) &&
754 handler->originally_enabled) {
755 (void)acpi_ev_add_gpe_reference(gpe_event_info);
756 }
757
758 /* Now we can free the handler object */
759
760 ACPI_FREE(handler);
761
762 unlock_and_exit:
763 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
764
765 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
766 return_ACPI_STATUS(status);
767 }
768
ACPI_EXPORT_SYMBOL(acpi_remove_gpe_handler)769 ACPI_EXPORT_SYMBOL(acpi_remove_gpe_handler)
770
771 /*******************************************************************************
772 *
773 * FUNCTION: acpi_acquire_global_lock
774 *
775 * PARAMETERS: timeout - How long the caller is willing to wait
776 * handle - Where the handle to the lock is returned
777 * (if acquired)
778 *
779 * RETURN: Status
780 *
781 * DESCRIPTION: Acquire the ACPI Global Lock
782 *
783 * Note: Allows callers with the same thread ID to acquire the global lock
784 * multiple times. In other words, externally, the behavior of the global lock
785 * is identical to an AML mutex. On the first acquire, a new handle is
786 * returned. On any subsequent calls to acquire by the same thread, the same
787 * handle is returned.
788 *
789 ******************************************************************************/
790 acpi_status acpi_acquire_global_lock(u16 timeout, u32 * handle)
791 {
792 acpi_status status;
793
794 if (!handle) {
795 return (AE_BAD_PARAMETER);
796 }
797
798 /* Must lock interpreter to prevent race conditions */
799
800 acpi_ex_enter_interpreter();
801
802 status = acpi_ex_acquire_mutex_object(timeout,
803 acpi_gbl_global_lock_mutex,
804 acpi_os_get_thread_id());
805
806 if (ACPI_SUCCESS(status)) {
807
808 /* Return the global lock handle (updated in acpi_ev_acquire_global_lock) */
809
810 *handle = acpi_gbl_global_lock_handle;
811 }
812
813 acpi_ex_exit_interpreter();
814 return (status);
815 }
816
ACPI_EXPORT_SYMBOL(acpi_acquire_global_lock)817 ACPI_EXPORT_SYMBOL(acpi_acquire_global_lock)
818
819 /*******************************************************************************
820 *
821 * FUNCTION: acpi_release_global_lock
822 *
823 * PARAMETERS: handle - Returned from acpi_acquire_global_lock
824 *
825 * RETURN: Status
826 *
827 * DESCRIPTION: Release the ACPI Global Lock. The handle must be valid.
828 *
829 ******************************************************************************/
830 acpi_status acpi_release_global_lock(u32 handle)
831 {
832 acpi_status status;
833
834 if (!handle || (handle != acpi_gbl_global_lock_handle)) {
835 return (AE_NOT_ACQUIRED);
836 }
837
838 status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex);
839 return (status);
840 }
841
842 ACPI_EXPORT_SYMBOL(acpi_release_global_lock)
843 #endif /* !ACPI_REDUCED_HARDWARE */
844