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1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2/******************************************************************************
3 *
4 * Module Name: evxface - External interfaces for ACPI events
5 *
6 * Copyright (C) 2000 - 2023, Intel Corp.
7 *
8 *****************************************************************************/
9
10#define EXPORT_ACPI_INTERFACES
11
12#include <acpi/acpi.h>
13#include "accommon.h"
14#include "acnamesp.h"
15#include "acevents.h"
16#include "acinterp.h"
17
18#define _COMPONENT ACPI_EVENTS
19ACPI_MODULE_NAME("evxface")
20#if (!ACPI_REDUCED_HARDWARE)
21/* Local prototypes */
22static acpi_status
23acpi_ev_install_gpe_handler(acpi_handle gpe_device,
24 u32 gpe_number,
25 u32 type,
26 u8 is_raw_handler,
27 acpi_gpe_handler address, void *context);
28
29#endif
30
31
32/*******************************************************************************
33 *
34 * FUNCTION: acpi_install_notify_handler
35 *
36 * PARAMETERS: device - The device for which notifies will be handled
37 * handler_type - The type of handler:
38 * ACPI_SYSTEM_NOTIFY: System Handler (00-7F)
39 * ACPI_DEVICE_NOTIFY: Device Handler (80-FF)
40 * ACPI_ALL_NOTIFY: Both System and Device
41 * handler - Address of the handler
42 * context - Value passed to the handler on each GPE
43 *
44 * RETURN: Status
45 *
46 * DESCRIPTION: Install a handler for notifications on an ACPI Device,
47 * thermal_zone, or Processor object.
48 *
49 * NOTES: The Root namespace object may have only one handler for each
50 * type of notify (System/Device). Device/Thermal/Processor objects
51 * may have one device notify handler, and multiple system notify
52 * handlers.
53 *
54 ******************************************************************************/
55
56acpi_status
57acpi_install_notify_handler(acpi_handle device,
58 u32 handler_type,
59 acpi_notify_handler handler, void *context)
60{
61 struct acpi_namespace_node *node =
62 ACPI_CAST_PTR(struct acpi_namespace_node, device);
63 union acpi_operand_object *obj_desc;
64 union acpi_operand_object *handler_obj;
65 acpi_status status;
66 u32 i;
67
68 ACPI_FUNCTION_TRACE(acpi_install_notify_handler);
69
70 /* Parameter validation */
71
72 if ((!device) || (!handler) || (!handler_type) ||
73 (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
74 return_ACPI_STATUS(AE_BAD_PARAMETER);
75 }
76
77 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
78 if (ACPI_FAILURE(status)) {
79 return_ACPI_STATUS(status);
80 }
81
82 /*
83 * Root Object:
84 * Registering a notify handler on the root object indicates that the
85 * caller wishes to receive notifications for all objects. Note that
86 * only one global handler can be registered per notify type.
87 * Ensure that a handler is not already installed.
88 */
89 if (device == ACPI_ROOT_OBJECT) {
90 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
91 if (handler_type & (i + 1)) {
92 if (acpi_gbl_global_notify[i].handler) {
93 status = AE_ALREADY_EXISTS;
94 goto unlock_and_exit;
95 }
96
97 acpi_gbl_global_notify[i].handler = handler;
98 acpi_gbl_global_notify[i].context = context;
99 }
100 }
101
102 goto unlock_and_exit; /* Global notify handler installed, all done */
103 }
104
105 /*
106 * All Other Objects:
107 * Caller will only receive notifications specific to the target
108 * object. Note that only certain object types are allowed to
109 * receive notifications.
110 */
111
112 /* Are Notifies allowed on this object? */
113
114 if (!acpi_ev_is_notify_object(node)) {
115 status = AE_TYPE;
116 goto unlock_and_exit;
117 }
118
119 /* Check for an existing internal object, might not exist */
120
121 obj_desc = acpi_ns_get_attached_object(node);
122 if (!obj_desc) {
123
124 /* Create a new object */
125
126 obj_desc = acpi_ut_create_internal_object(node->type);
127 if (!obj_desc) {
128 status = AE_NO_MEMORY;
129 goto unlock_and_exit;
130 }
131
132 /* Attach new object to the Node, remove local reference */
133
134 status = acpi_ns_attach_object(device, obj_desc, node->type);
135 acpi_ut_remove_reference(obj_desc);
136 if (ACPI_FAILURE(status)) {
137 goto unlock_and_exit;
138 }
139 }
140
141 /* Ensure that the handler is not already installed in the lists */
142
143 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
144 if (handler_type & (i + 1)) {
145 handler_obj = obj_desc->common_notify.notify_list[i];
146 while (handler_obj) {
147 if (handler_obj->notify.handler == handler) {
148 status = AE_ALREADY_EXISTS;
149 goto unlock_and_exit;
150 }
151
152 handler_obj = handler_obj->notify.next[i];
153 }
154 }
155 }
156
157 /* Create and populate a new notify handler object */
158
159 handler_obj = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_NOTIFY);
160 if (!handler_obj) {
161 status = AE_NO_MEMORY;
162 goto unlock_and_exit;
163 }
164
165 handler_obj->notify.node = node;
166 handler_obj->notify.handler_type = handler_type;
167 handler_obj->notify.handler = handler;
168 handler_obj->notify.context = context;
169
170 /* Install the handler at the list head(s) */
171
172 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
173 if (handler_type & (i + 1)) {
174 handler_obj->notify.next[i] =
175 obj_desc->common_notify.notify_list[i];
176
177 obj_desc->common_notify.notify_list[i] = handler_obj;
178 }
179 }
180
181 /* Add an extra reference if handler was installed in both lists */
182
183 if (handler_type == ACPI_ALL_NOTIFY) {
184 acpi_ut_add_reference(handler_obj);
185 }
186
187unlock_and_exit:
188 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
189 return_ACPI_STATUS(status);
190}
191
192ACPI_EXPORT_SYMBOL(acpi_install_notify_handler)
193
194/*******************************************************************************
195 *
196 * FUNCTION: acpi_remove_notify_handler
197 *
198 * PARAMETERS: device - The device for which the handler is installed
199 * handler_type - The type of handler:
200 * ACPI_SYSTEM_NOTIFY: System Handler (00-7F)
201 * ACPI_DEVICE_NOTIFY: Device Handler (80-FF)
202 * ACPI_ALL_NOTIFY: Both System and Device
203 * handler - Address of the handler
204 *
205 * RETURN: Status
206 *
207 * DESCRIPTION: Remove a handler for notifies on an ACPI device
208 *
209 ******************************************************************************/
210acpi_status
211acpi_remove_notify_handler(acpi_handle device,
212 u32 handler_type, acpi_notify_handler handler)
213{
214 struct acpi_namespace_node *node =
215 ACPI_CAST_PTR(struct acpi_namespace_node, device);
216 union acpi_operand_object *obj_desc;
217 union acpi_operand_object *handler_obj;
218 union acpi_operand_object *previous_handler_obj;
219 acpi_status status = AE_OK;
220 u32 i;
221
222 ACPI_FUNCTION_TRACE(acpi_remove_notify_handler);
223
224 /* Parameter validation */
225
226 if ((!device) || (!handler) || (!handler_type) ||
227 (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
228 return_ACPI_STATUS(AE_BAD_PARAMETER);
229 }
230
231 /* Root Object. Global handlers are removed here */
232
233 if (device == ACPI_ROOT_OBJECT) {
234 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
235 if (handler_type & (i + 1)) {
236 status =
237 acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
238 if (ACPI_FAILURE(status)) {
239 return_ACPI_STATUS(status);
240 }
241
242 if (!acpi_gbl_global_notify[i].handler ||
243 (acpi_gbl_global_notify[i].handler !=
244 handler)) {
245 status = AE_NOT_EXIST;
246 goto unlock_and_exit;
247 }
248
249 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
250 "Removing global notify handler\n"));
251
252 acpi_gbl_global_notify[i].handler = NULL;
253 acpi_gbl_global_notify[i].context = NULL;
254
255 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
256
257 /* Make sure all deferred notify tasks are completed */
258
259 acpi_os_wait_events_complete();
260 }
261 }
262
263 return_ACPI_STATUS(AE_OK);
264 }
265
266 /* All other objects: Are Notifies allowed on this object? */
267
268 if (!acpi_ev_is_notify_object(node)) {
269 return_ACPI_STATUS(AE_TYPE);
270 }
271
272 /* Must have an existing internal object */
273
274 obj_desc = acpi_ns_get_attached_object(node);
275 if (!obj_desc) {
276 return_ACPI_STATUS(AE_NOT_EXIST);
277 }
278
279 /* Internal object exists. Find the handler and remove it */
280
281 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
282 if (handler_type & (i + 1)) {
283 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
284 if (ACPI_FAILURE(status)) {
285 return_ACPI_STATUS(status);
286 }
287
288 handler_obj = obj_desc->common_notify.notify_list[i];
289 previous_handler_obj = NULL;
290
291 /* Attempt to find the handler in the handler list */
292
293 while (handler_obj &&
294 (handler_obj->notify.handler != handler)) {
295 previous_handler_obj = handler_obj;
296 handler_obj = handler_obj->notify.next[i];
297 }
298
299 if (!handler_obj) {
300 status = AE_NOT_EXIST;
301 goto unlock_and_exit;
302 }
303
304 /* Remove the handler object from the list */
305
306 if (previous_handler_obj) { /* Handler is not at the list head */
307 previous_handler_obj->notify.next[i] =
308 handler_obj->notify.next[i];
309 } else { /* Handler is at the list head */
310
311 obj_desc->common_notify.notify_list[i] =
312 handler_obj->notify.next[i];
313 }
314
315 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
316
317 /* Make sure all deferred notify tasks are completed */
318
319 acpi_os_wait_events_complete();
320 acpi_ut_remove_reference(handler_obj);
321 }
322 }
323
324 return_ACPI_STATUS(status);
325
326unlock_and_exit:
327 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
328 return_ACPI_STATUS(status);
329}
330
331ACPI_EXPORT_SYMBOL(acpi_remove_notify_handler)
332
333/*******************************************************************************
334 *
335 * FUNCTION: acpi_install_exception_handler
336 *
337 * PARAMETERS: handler - Pointer to the handler function for the
338 * event
339 *
340 * RETURN: Status
341 *
342 * DESCRIPTION: Saves the pointer to the handler function
343 *
344 ******************************************************************************/
345#ifdef ACPI_FUTURE_USAGE
346acpi_status acpi_install_exception_handler(acpi_exception_handler handler)
347{
348 acpi_status status;
349
350 ACPI_FUNCTION_TRACE(acpi_install_exception_handler);
351
352 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
353 if (ACPI_FAILURE(status)) {
354 return_ACPI_STATUS(status);
355 }
356
357 /* Don't allow two handlers. */
358
359 if (acpi_gbl_exception_handler) {
360 status = AE_ALREADY_EXISTS;
361 goto cleanup;
362 }
363
364 /* Install the handler */
365
366 acpi_gbl_exception_handler = handler;
367
368cleanup:
369 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
370 return_ACPI_STATUS(status);
371}
372
373ACPI_EXPORT_SYMBOL(acpi_install_exception_handler)
374#endif
375
376#if (!ACPI_REDUCED_HARDWARE)
377/*******************************************************************************
378 *
379 * FUNCTION: acpi_install_sci_handler
380 *
381 * PARAMETERS: address - Address of the handler
382 * context - Value passed to the handler on each SCI
383 *
384 * RETURN: Status
385 *
386 * DESCRIPTION: Install a handler for a System Control Interrupt.
387 *
388 ******************************************************************************/
389acpi_status acpi_install_sci_handler(acpi_sci_handler address, void *context)
390{
391 struct acpi_sci_handler_info *new_sci_handler;
392 struct acpi_sci_handler_info *sci_handler;
393 acpi_cpu_flags flags;
394 acpi_status status;
395
396 ACPI_FUNCTION_TRACE(acpi_install_sci_handler);
397
398 if (!address) {
399 return_ACPI_STATUS(AE_BAD_PARAMETER);
400 }
401
402 /* Allocate and init a handler object */
403
404 new_sci_handler = ACPI_ALLOCATE(sizeof(struct acpi_sci_handler_info));
405 if (!new_sci_handler) {
406 return_ACPI_STATUS(AE_NO_MEMORY);
407 }
408
409 new_sci_handler->address = address;
410 new_sci_handler->context = context;
411
412 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
413 if (ACPI_FAILURE(status)) {
414 goto exit;
415 }
416
417 /* Lock list during installation */
418
419 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
420 sci_handler = acpi_gbl_sci_handler_list;
421
422 /* Ensure handler does not already exist */
423
424 while (sci_handler) {
425 if (address == sci_handler->address) {
426 status = AE_ALREADY_EXISTS;
427 goto unlock_and_exit;
428 }
429
430 sci_handler = sci_handler->next;
431 }
432
433 /* Install the new handler into the global list (at head) */
434
435 new_sci_handler->next = acpi_gbl_sci_handler_list;
436 acpi_gbl_sci_handler_list = new_sci_handler;
437
438unlock_and_exit:
439
440 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
441 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
442
443exit:
444 if (ACPI_FAILURE(status)) {
445 ACPI_FREE(new_sci_handler);
446 }
447 return_ACPI_STATUS(status);
448}
449
450ACPI_EXPORT_SYMBOL(acpi_install_sci_handler)
451
452/*******************************************************************************
453 *
454 * FUNCTION: acpi_remove_sci_handler
455 *
456 * PARAMETERS: address - Address of the handler
457 *
458 * RETURN: Status
459 *
460 * DESCRIPTION: Remove a handler for a System Control Interrupt.
461 *
462 ******************************************************************************/
463acpi_status acpi_remove_sci_handler(acpi_sci_handler address)
464{
465 struct acpi_sci_handler_info *prev_sci_handler;
466 struct acpi_sci_handler_info *next_sci_handler;
467 acpi_cpu_flags flags;
468 acpi_status status;
469
470 ACPI_FUNCTION_TRACE(acpi_remove_sci_handler);
471
472 if (!address) {
473 return_ACPI_STATUS(AE_BAD_PARAMETER);
474 }
475
476 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
477 if (ACPI_FAILURE(status)) {
478 return_ACPI_STATUS(status);
479 }
480
481 /* Remove the SCI handler with lock */
482
483 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
484
485 prev_sci_handler = NULL;
486 next_sci_handler = acpi_gbl_sci_handler_list;
487 while (next_sci_handler) {
488 if (next_sci_handler->address == address) {
489
490 /* Unlink and free the SCI handler info block */
491
492 if (prev_sci_handler) {
493 prev_sci_handler->next = next_sci_handler->next;
494 } else {
495 acpi_gbl_sci_handler_list =
496 next_sci_handler->next;
497 }
498
499 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
500 ACPI_FREE(next_sci_handler);
501 goto unlock_and_exit;
502 }
503
504 prev_sci_handler = next_sci_handler;
505 next_sci_handler = next_sci_handler->next;
506 }
507
508 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
509 status = AE_NOT_EXIST;
510
511unlock_and_exit:
512 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
513 return_ACPI_STATUS(status);
514}
515
516ACPI_EXPORT_SYMBOL(acpi_remove_sci_handler)
517
518/*******************************************************************************
519 *
520 * FUNCTION: acpi_install_global_event_handler
521 *
522 * PARAMETERS: handler - Pointer to the global event handler function
523 * context - Value passed to the handler on each event
524 *
525 * RETURN: Status
526 *
527 * DESCRIPTION: Saves the pointer to the handler function. The global handler
528 * is invoked upon each incoming GPE and Fixed Event. It is
529 * invoked at interrupt level at the time of the event dispatch.
530 * Can be used to update event counters, etc.
531 *
532 ******************************************************************************/
533acpi_status
534acpi_install_global_event_handler(acpi_gbl_event_handler handler, void *context)
535{
536 acpi_status status;
537
538 ACPI_FUNCTION_TRACE(acpi_install_global_event_handler);
539
540 /* Parameter validation */
541
542 if (!handler) {
543 return_ACPI_STATUS(AE_BAD_PARAMETER);
544 }
545
546 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
547 if (ACPI_FAILURE(status)) {
548 return_ACPI_STATUS(status);
549 }
550
551 /* Don't allow two handlers. */
552
553 if (acpi_gbl_global_event_handler) {
554 status = AE_ALREADY_EXISTS;
555 goto cleanup;
556 }
557
558 acpi_gbl_global_event_handler = handler;
559 acpi_gbl_global_event_handler_context = context;
560
561cleanup:
562 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
563 return_ACPI_STATUS(status);
564}
565
566ACPI_EXPORT_SYMBOL(acpi_install_global_event_handler)
567
568/*******************************************************************************
569 *
570 * FUNCTION: acpi_install_fixed_event_handler
571 *
572 * PARAMETERS: event - Event type to enable.
573 * handler - Pointer to the handler function for the
574 * event
575 * context - Value passed to the handler on each GPE
576 *
577 * RETURN: Status
578 *
579 * DESCRIPTION: Saves the pointer to the handler function and then enables the
580 * event.
581 *
582 ******************************************************************************/
583acpi_status
584acpi_install_fixed_event_handler(u32 event,
585 acpi_event_handler handler, void *context)
586{
587 acpi_status status;
588
589 ACPI_FUNCTION_TRACE(acpi_install_fixed_event_handler);
590
591 /* Parameter validation */
592
593 if (event > ACPI_EVENT_MAX) {
594 return_ACPI_STATUS(AE_BAD_PARAMETER);
595 }
596
597 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
598 if (ACPI_FAILURE(status)) {
599 return_ACPI_STATUS(status);
600 }
601
602 /* Do not allow multiple handlers */
603
604 if (acpi_gbl_fixed_event_handlers[event].handler) {
605 status = AE_ALREADY_EXISTS;
606 goto cleanup;
607 }
608
609 /* Install the handler before enabling the event */
610
611 acpi_gbl_fixed_event_handlers[event].handler = handler;
612 acpi_gbl_fixed_event_handlers[event].context = context;
613
614 status = acpi_clear_event(event);
615 if (ACPI_SUCCESS(status))
616 status = acpi_enable_event(event, 0);
617 if (ACPI_FAILURE(status)) {
618 ACPI_WARNING((AE_INFO,
619 "Could not enable fixed event - %s (%u)",
620 acpi_ut_get_event_name(event), event));
621
622 /* Remove the handler */
623
624 acpi_gbl_fixed_event_handlers[event].handler = NULL;
625 acpi_gbl_fixed_event_handlers[event].context = NULL;
626 } else {
627 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
628 "Enabled fixed event %s (%X), Handler=%p\n",
629 acpi_ut_get_event_name(event), event,
630 handler));
631 }
632
633cleanup:
634 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
635 return_ACPI_STATUS(status);
636}
637
638ACPI_EXPORT_SYMBOL(acpi_install_fixed_event_handler)
639
640/*******************************************************************************
641 *
642 * FUNCTION: acpi_remove_fixed_event_handler
643 *
644 * PARAMETERS: event - Event type to disable.
645 * handler - Address of the handler
646 *
647 * RETURN: Status
648 *
649 * DESCRIPTION: Disables the event and unregisters the event handler.
650 *
651 ******************************************************************************/
652acpi_status
653acpi_remove_fixed_event_handler(u32 event, acpi_event_handler handler)
654{
655 acpi_status status = AE_OK;
656
657 ACPI_FUNCTION_TRACE(acpi_remove_fixed_event_handler);
658
659 /* Parameter validation */
660
661 if (event > ACPI_EVENT_MAX) {
662 return_ACPI_STATUS(AE_BAD_PARAMETER);
663 }
664
665 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
666 if (ACPI_FAILURE(status)) {
667 return_ACPI_STATUS(status);
668 }
669
670 /* Disable the event before removing the handler */
671
672 status = acpi_disable_event(event, 0);
673
674 /* Always Remove the handler */
675
676 acpi_gbl_fixed_event_handlers[event].handler = NULL;
677 acpi_gbl_fixed_event_handlers[event].context = NULL;
678
679 if (ACPI_FAILURE(status)) {
680 ACPI_WARNING((AE_INFO,
681 "Could not disable fixed event - %s (%u)",
682 acpi_ut_get_event_name(event), event));
683 } else {
684 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
685 "Disabled fixed event - %s (%X)\n",
686 acpi_ut_get_event_name(event), event));
687 }
688
689 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
690 return_ACPI_STATUS(status);
691}
692
693ACPI_EXPORT_SYMBOL(acpi_remove_fixed_event_handler)
694
695/*******************************************************************************
696 *
697 * FUNCTION: acpi_ev_install_gpe_handler
698 *
699 * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT
700 * defined GPEs)
701 * gpe_number - The GPE number within the GPE block
702 * type - Whether this GPE should be treated as an
703 * edge- or level-triggered interrupt.
704 * is_raw_handler - Whether this GPE should be handled using
705 * the special GPE handler mode.
706 * address - Address of the handler
707 * context - Value passed to the handler on each GPE
708 *
709 * RETURN: Status
710 *
711 * DESCRIPTION: Internal function to install a handler for a General Purpose
712 * Event.
713 *
714 ******************************************************************************/
715static acpi_status
716acpi_ev_install_gpe_handler(acpi_handle gpe_device,
717 u32 gpe_number,
718 u32 type,
719 u8 is_raw_handler,
720 acpi_gpe_handler address, void *context)
721{
722 struct acpi_gpe_event_info *gpe_event_info;
723 struct acpi_gpe_handler_info *handler;
724 acpi_status status;
725 acpi_cpu_flags flags;
726
727 ACPI_FUNCTION_TRACE(ev_install_gpe_handler);
728
729 /* Parameter validation */
730
731 if ((!address) || (type & ~ACPI_GPE_XRUPT_TYPE_MASK)) {
732 return_ACPI_STATUS(AE_BAD_PARAMETER);
733 }
734
735 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
736 if (ACPI_FAILURE(status)) {
737 return_ACPI_STATUS(status);
738 }
739
740 /* Allocate and init handler object (before lock) */
741
742 handler = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_handler_info));
743 if (!handler) {
744 status = AE_NO_MEMORY;
745 goto unlock_and_exit;
746 }
747
748 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
749
750 /* Ensure that we have a valid GPE number */
751
752 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
753 if (!gpe_event_info) {
754 status = AE_BAD_PARAMETER;
755 goto free_and_exit;
756 }
757
758 /* Make sure that there isn't a handler there already */
759
760 if ((ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) ==
761 ACPI_GPE_DISPATCH_HANDLER) ||
762 (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) ==
763 ACPI_GPE_DISPATCH_RAW_HANDLER)) {
764 status = AE_ALREADY_EXISTS;
765 goto free_and_exit;
766 }
767
768 handler->address = address;
769 handler->context = context;
770 handler->method_node = gpe_event_info->dispatch.method_node;
771 handler->original_flags = (u8)(gpe_event_info->flags &
772 (ACPI_GPE_XRUPT_TYPE_MASK |
773 ACPI_GPE_DISPATCH_MASK));
774
775 /*
776 * If the GPE is associated with a method, it may have been enabled
777 * automatically during initialization, in which case it has to be
778 * disabled now to avoid spurious execution of the handler.
779 */
780 if (((ACPI_GPE_DISPATCH_TYPE(handler->original_flags) ==
781 ACPI_GPE_DISPATCH_METHOD) ||
782 (ACPI_GPE_DISPATCH_TYPE(handler->original_flags) ==
783 ACPI_GPE_DISPATCH_NOTIFY)) && gpe_event_info->runtime_count) {
784 handler->originally_enabled = TRUE;
785 (void)acpi_ev_remove_gpe_reference(gpe_event_info);
786
787 /* Sanity check of original type against new type */
788
789 if (type !=
790 (u32)(gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK)) {
791 ACPI_WARNING((AE_INFO,
792 "GPE type mismatch (level/edge)"));
793 }
794 }
795
796 /* Install the handler */
797
798 gpe_event_info->dispatch.handler = handler;
799
800 /* Setup up dispatch flags to indicate handler (vs. method/notify) */
801
802 gpe_event_info->flags &=
803 ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
804 gpe_event_info->flags |=
805 (u8)(type |
806 (is_raw_handler ? ACPI_GPE_DISPATCH_RAW_HANDLER :
807 ACPI_GPE_DISPATCH_HANDLER));
808
809 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
810
811unlock_and_exit:
812 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
813 return_ACPI_STATUS(status);
814
815free_and_exit:
816 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
817 ACPI_FREE(handler);
818 goto unlock_and_exit;
819}
820
821/*******************************************************************************
822 *
823 * FUNCTION: acpi_install_gpe_handler
824 *
825 * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT
826 * defined GPEs)
827 * gpe_number - The GPE number within the GPE block
828 * type - Whether this GPE should be treated as an
829 * edge- or level-triggered interrupt.
830 * address - Address of the handler
831 * context - Value passed to the handler on each GPE
832 *
833 * RETURN: Status
834 *
835 * DESCRIPTION: Install a handler for a General Purpose Event.
836 *
837 ******************************************************************************/
838
839acpi_status
840acpi_install_gpe_handler(acpi_handle gpe_device,
841 u32 gpe_number,
842 u32 type, acpi_gpe_handler address, void *context)
843{
844 acpi_status status;
845
846 ACPI_FUNCTION_TRACE(acpi_install_gpe_handler);
847
848 status = acpi_ev_install_gpe_handler(gpe_device, gpe_number, type,
849 FALSE, address, context);
850
851 return_ACPI_STATUS(status);
852}
853
854ACPI_EXPORT_SYMBOL(acpi_install_gpe_handler)
855
856/*******************************************************************************
857 *
858 * FUNCTION: acpi_install_gpe_raw_handler
859 *
860 * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT
861 * defined GPEs)
862 * gpe_number - The GPE number within the GPE block
863 * type - Whether this GPE should be treated as an
864 * edge- or level-triggered interrupt.
865 * address - Address of the handler
866 * context - Value passed to the handler on each GPE
867 *
868 * RETURN: Status
869 *
870 * DESCRIPTION: Install a handler for a General Purpose Event.
871 *
872 ******************************************************************************/
873acpi_status
874acpi_install_gpe_raw_handler(acpi_handle gpe_device,
875 u32 gpe_number,
876 u32 type, acpi_gpe_handler address, void *context)
877{
878 acpi_status status;
879
880 ACPI_FUNCTION_TRACE(acpi_install_gpe_raw_handler);
881
882 status = acpi_ev_install_gpe_handler(gpe_device, gpe_number, type,
883 TRUE, address, context);
884
885 return_ACPI_STATUS(status);
886}
887
888ACPI_EXPORT_SYMBOL(acpi_install_gpe_raw_handler)
889
890/*******************************************************************************
891 *
892 * FUNCTION: acpi_remove_gpe_handler
893 *
894 * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT
895 * defined GPEs)
896 * gpe_number - The event to remove a handler
897 * address - Address of the handler
898 *
899 * RETURN: Status
900 *
901 * DESCRIPTION: Remove a handler for a General Purpose acpi_event.
902 *
903 ******************************************************************************/
904acpi_status
905acpi_remove_gpe_handler(acpi_handle gpe_device,
906 u32 gpe_number, acpi_gpe_handler address)
907{
908 struct acpi_gpe_event_info *gpe_event_info;
909 struct acpi_gpe_handler_info *handler;
910 acpi_status status;
911 acpi_cpu_flags flags;
912
913 ACPI_FUNCTION_TRACE(acpi_remove_gpe_handler);
914
915 /* Parameter validation */
916
917 if (!address) {
918 return_ACPI_STATUS(AE_BAD_PARAMETER);
919 }
920
921 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
922 if (ACPI_FAILURE(status)) {
923 return_ACPI_STATUS(status);
924 }
925
926 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
927
928 /* Ensure that we have a valid GPE number */
929
930 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
931 if (!gpe_event_info) {
932 status = AE_BAD_PARAMETER;
933 goto unlock_and_exit;
934 }
935
936 /* Make sure that a handler is indeed installed */
937
938 if ((ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) !=
939 ACPI_GPE_DISPATCH_HANDLER) &&
940 (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) !=
941 ACPI_GPE_DISPATCH_RAW_HANDLER)) {
942 status = AE_NOT_EXIST;
943 goto unlock_and_exit;
944 }
945
946 /* Make sure that the installed handler is the same */
947
948 if (gpe_event_info->dispatch.handler->address != address) {
949 status = AE_BAD_PARAMETER;
950 goto unlock_and_exit;
951 }
952
953 /* Remove the handler */
954
955 handler = gpe_event_info->dispatch.handler;
956 gpe_event_info->dispatch.handler = NULL;
957
958 /* Restore Method node (if any), set dispatch flags */
959
960 gpe_event_info->dispatch.method_node = handler->method_node;
961 gpe_event_info->flags &=
962 ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
963 gpe_event_info->flags |= handler->original_flags;
964
965 /*
966 * If the GPE was previously associated with a method and it was
967 * enabled, it should be enabled at this point to restore the
968 * post-initialization configuration.
969 */
970 if (((ACPI_GPE_DISPATCH_TYPE(handler->original_flags) ==
971 ACPI_GPE_DISPATCH_METHOD) ||
972 (ACPI_GPE_DISPATCH_TYPE(handler->original_flags) ==
973 ACPI_GPE_DISPATCH_NOTIFY)) && handler->originally_enabled) {
974 (void)acpi_ev_add_gpe_reference(gpe_event_info, FALSE);
975 if (ACPI_GPE_IS_POLLING_NEEDED(gpe_event_info)) {
976
977 /* Poll edge triggered GPEs to handle existing events */
978
979 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
980 (void)acpi_ev_detect_gpe(gpe_device, gpe_event_info,
981 gpe_number);
982 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
983 }
984 }
985
986 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
987 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
988
989 /* Make sure all deferred GPE tasks are completed */
990
991 acpi_os_wait_events_complete();
992
993 /* Now we can free the handler object */
994
995 ACPI_FREE(handler);
996 return_ACPI_STATUS(status);
997
998unlock_and_exit:
999 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
1000
1001 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
1002 return_ACPI_STATUS(status);
1003}
1004
1005ACPI_EXPORT_SYMBOL(acpi_remove_gpe_handler)
1006
1007/*******************************************************************************
1008 *
1009 * FUNCTION: acpi_acquire_global_lock
1010 *
1011 * PARAMETERS: timeout - How long the caller is willing to wait
1012 * handle - Where the handle to the lock is returned
1013 * (if acquired)
1014 *
1015 * RETURN: Status
1016 *
1017 * DESCRIPTION: Acquire the ACPI Global Lock
1018 *
1019 * Note: Allows callers with the same thread ID to acquire the global lock
1020 * multiple times. In other words, externally, the behavior of the global lock
1021 * is identical to an AML mutex. On the first acquire, a new handle is
1022 * returned. On any subsequent calls to acquire by the same thread, the same
1023 * handle is returned.
1024 *
1025 ******************************************************************************/
1026acpi_status acpi_acquire_global_lock(u16 timeout, u32 *handle)
1027{
1028 acpi_status status;
1029
1030 if (!handle) {
1031 return (AE_BAD_PARAMETER);
1032 }
1033
1034 /* Must lock interpreter to prevent race conditions */
1035
1036 acpi_ex_enter_interpreter();
1037
1038 status = acpi_ex_acquire_mutex_object(timeout,
1039 acpi_gbl_global_lock_mutex,
1040 acpi_os_get_thread_id());
1041
1042 if (ACPI_SUCCESS(status)) {
1043
1044 /* Return the global lock handle (updated in acpi_ev_acquire_global_lock) */
1045
1046 *handle = acpi_gbl_global_lock_handle;
1047 }
1048
1049 acpi_ex_exit_interpreter();
1050 return (status);
1051}
1052
1053ACPI_EXPORT_SYMBOL(acpi_acquire_global_lock)
1054
1055/*******************************************************************************
1056 *
1057 * FUNCTION: acpi_release_global_lock
1058 *
1059 * PARAMETERS: handle - Returned from acpi_acquire_global_lock
1060 *
1061 * RETURN: Status
1062 *
1063 * DESCRIPTION: Release the ACPI Global Lock. The handle must be valid.
1064 *
1065 ******************************************************************************/
1066acpi_status acpi_release_global_lock(u32 handle)
1067{
1068 acpi_status status;
1069
1070 if (!handle || (handle != acpi_gbl_global_lock_handle)) {
1071 return (AE_NOT_ACQUIRED);
1072 }
1073
1074 status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex);
1075 return (status);
1076}
1077
1078ACPI_EXPORT_SYMBOL(acpi_release_global_lock)
1079#endif /* !ACPI_REDUCED_HARDWARE */
1/******************************************************************************
2 *
3 * Module Name: evxface - External interfaces for ACPI events
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2014, 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#define EXPORT_ACPI_INTERFACES
45
46#include <acpi/acpi.h>
47#include "accommon.h"
48#include "acnamesp.h"
49#include "acevents.h"
50#include "acinterp.h"
51
52#define _COMPONENT ACPI_EVENTS
53ACPI_MODULE_NAME("evxface")
54
55
56/*******************************************************************************
57 *
58 * FUNCTION: acpi_install_notify_handler
59 *
60 * PARAMETERS: device - The device for which notifies will be handled
61 * handler_type - The type of handler:
62 * ACPI_SYSTEM_NOTIFY: System Handler (00-7F)
63 * ACPI_DEVICE_NOTIFY: Device Handler (80-FF)
64 * ACPI_ALL_NOTIFY: Both System and Device
65 * handler - Address of the handler
66 * context - Value passed to the handler on each GPE
67 *
68 * RETURN: Status
69 *
70 * DESCRIPTION: Install a handler for notifications on an ACPI Device,
71 * thermal_zone, or Processor object.
72 *
73 * NOTES: The Root namespace object may have only one handler for each
74 * type of notify (System/Device). Device/Thermal/Processor objects
75 * may have one device notify handler, and multiple system notify
76 * handlers.
77 *
78 ******************************************************************************/
79acpi_status
80acpi_install_notify_handler(acpi_handle device,
81 u32 handler_type,
82 acpi_notify_handler handler, void *context)
83{
84 struct acpi_namespace_node *node =
85 ACPI_CAST_PTR(struct acpi_namespace_node, device);
86 union acpi_operand_object *obj_desc;
87 union acpi_operand_object *handler_obj;
88 acpi_status status;
89 u32 i;
90
91 ACPI_FUNCTION_TRACE(acpi_install_notify_handler);
92
93 /* Parameter validation */
94
95 if ((!device) || (!handler) || (!handler_type) ||
96 (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
97 return_ACPI_STATUS(AE_BAD_PARAMETER);
98 }
99
100 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
101 if (ACPI_FAILURE(status)) {
102 return_ACPI_STATUS(status);
103 }
104
105 /*
106 * Root Object:
107 * Registering a notify handler on the root object indicates that the
108 * caller wishes to receive notifications for all objects. Note that
109 * only one global handler can be registered per notify type.
110 * Ensure that a handler is not already installed.
111 */
112 if (device == ACPI_ROOT_OBJECT) {
113 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
114 if (handler_type & (i + 1)) {
115 if (acpi_gbl_global_notify[i].handler) {
116 status = AE_ALREADY_EXISTS;
117 goto unlock_and_exit;
118 }
119
120 acpi_gbl_global_notify[i].handler = handler;
121 acpi_gbl_global_notify[i].context = context;
122 }
123 }
124
125 goto unlock_and_exit; /* Global notify handler installed, all done */
126 }
127
128 /*
129 * All Other Objects:
130 * Caller will only receive notifications specific to the target
131 * object. Note that only certain object types are allowed to
132 * receive notifications.
133 */
134
135 /* Are Notifies allowed on this object? */
136
137 if (!acpi_ev_is_notify_object(node)) {
138 status = AE_TYPE;
139 goto unlock_and_exit;
140 }
141
142 /* Check for an existing internal object, might not exist */
143
144 obj_desc = acpi_ns_get_attached_object(node);
145 if (!obj_desc) {
146
147 /* Create a new object */
148
149 obj_desc = acpi_ut_create_internal_object(node->type);
150 if (!obj_desc) {
151 status = AE_NO_MEMORY;
152 goto unlock_and_exit;
153 }
154
155 /* Attach new object to the Node, remove local reference */
156
157 status = acpi_ns_attach_object(device, obj_desc, node->type);
158 acpi_ut_remove_reference(obj_desc);
159 if (ACPI_FAILURE(status)) {
160 goto unlock_and_exit;
161 }
162 }
163
164 /* Ensure that the handler is not already installed in the lists */
165
166 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
167 if (handler_type & (i + 1)) {
168 handler_obj = obj_desc->common_notify.notify_list[i];
169 while (handler_obj) {
170 if (handler_obj->notify.handler == handler) {
171 status = AE_ALREADY_EXISTS;
172 goto unlock_and_exit;
173 }
174
175 handler_obj = handler_obj->notify.next[i];
176 }
177 }
178 }
179
180 /* Create and populate a new notify handler object */
181
182 handler_obj = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_NOTIFY);
183 if (!handler_obj) {
184 status = AE_NO_MEMORY;
185 goto unlock_and_exit;
186 }
187
188 handler_obj->notify.node = node;
189 handler_obj->notify.handler_type = handler_type;
190 handler_obj->notify.handler = handler;
191 handler_obj->notify.context = context;
192
193 /* Install the handler at the list head(s) */
194
195 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
196 if (handler_type & (i + 1)) {
197 handler_obj->notify.next[i] =
198 obj_desc->common_notify.notify_list[i];
199
200 obj_desc->common_notify.notify_list[i] = handler_obj;
201 }
202 }
203
204 /* Add an extra reference if handler was installed in both lists */
205
206 if (handler_type == ACPI_ALL_NOTIFY) {
207 acpi_ut_add_reference(handler_obj);
208 }
209
210unlock_and_exit:
211 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
212 return_ACPI_STATUS(status);
213}
214
215ACPI_EXPORT_SYMBOL(acpi_install_notify_handler)
216
217/*******************************************************************************
218 *
219 * FUNCTION: acpi_remove_notify_handler
220 *
221 * PARAMETERS: device - The device for which the handler is installed
222 * handler_type - The type of handler:
223 * ACPI_SYSTEM_NOTIFY: System Handler (00-7F)
224 * ACPI_DEVICE_NOTIFY: Device Handler (80-FF)
225 * ACPI_ALL_NOTIFY: Both System and Device
226 * handler - Address of the handler
227 *
228 * RETURN: Status
229 *
230 * DESCRIPTION: Remove a handler for notifies on an ACPI device
231 *
232 ******************************************************************************/
233acpi_status
234acpi_remove_notify_handler(acpi_handle device,
235 u32 handler_type, acpi_notify_handler handler)
236{
237 struct acpi_namespace_node *node =
238 ACPI_CAST_PTR(struct acpi_namespace_node, device);
239 union acpi_operand_object *obj_desc;
240 union acpi_operand_object *handler_obj;
241 union acpi_operand_object *previous_handler_obj;
242 acpi_status status;
243 u32 i;
244
245 ACPI_FUNCTION_TRACE(acpi_remove_notify_handler);
246
247 /* Parameter validation */
248
249 if ((!device) || (!handler) || (!handler_type) ||
250 (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
251 return_ACPI_STATUS(AE_BAD_PARAMETER);
252 }
253
254 /* Make sure all deferred notify tasks are completed */
255
256 acpi_os_wait_events_complete();
257
258 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
259 if (ACPI_FAILURE(status)) {
260 return_ACPI_STATUS(status);
261 }
262
263 /* Root Object. Global handlers are removed here */
264
265 if (device == ACPI_ROOT_OBJECT) {
266 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
267 if (handler_type & (i + 1)) {
268 if (!acpi_gbl_global_notify[i].handler ||
269 (acpi_gbl_global_notify[i].handler !=
270 handler)) {
271 status = AE_NOT_EXIST;
272 goto unlock_and_exit;
273 }
274
275 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
276 "Removing global notify handler\n"));
277
278 acpi_gbl_global_notify[i].handler = NULL;
279 acpi_gbl_global_notify[i].context = NULL;
280 }
281 }
282
283 goto unlock_and_exit;
284 }
285
286 /* All other objects: Are Notifies allowed on this object? */
287
288 if (!acpi_ev_is_notify_object(node)) {
289 status = AE_TYPE;
290 goto unlock_and_exit;
291 }
292
293 /* Must have an existing internal object */
294
295 obj_desc = acpi_ns_get_attached_object(node);
296 if (!obj_desc) {
297 status = AE_NOT_EXIST;
298 goto unlock_and_exit;
299 }
300
301 /* Internal object exists. Find the handler and remove it */
302
303 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
304 if (handler_type & (i + 1)) {
305 handler_obj = obj_desc->common_notify.notify_list[i];
306 previous_handler_obj = NULL;
307
308 /* Attempt to find the handler in the handler list */
309
310 while (handler_obj &&
311 (handler_obj->notify.handler != handler)) {
312 previous_handler_obj = handler_obj;
313 handler_obj = handler_obj->notify.next[i];
314 }
315
316 if (!handler_obj) {
317 status = AE_NOT_EXIST;
318 goto unlock_and_exit;
319 }
320
321 /* Remove the handler object from the list */
322
323 if (previous_handler_obj) { /* Handler is not at the list head */
324 previous_handler_obj->notify.next[i] =
325 handler_obj->notify.next[i];
326 } else { /* Handler is at the list head */
327
328 obj_desc->common_notify.notify_list[i] =
329 handler_obj->notify.next[i];
330 }
331
332 acpi_ut_remove_reference(handler_obj);
333 }
334 }
335
336unlock_and_exit:
337 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
338 return_ACPI_STATUS(status);
339}
340
341ACPI_EXPORT_SYMBOL(acpi_remove_notify_handler)
342
343/*******************************************************************************
344 *
345 * FUNCTION: acpi_install_exception_handler
346 *
347 * PARAMETERS: handler - Pointer to the handler function for the
348 * event
349 *
350 * RETURN: Status
351 *
352 * DESCRIPTION: Saves the pointer to the handler function
353 *
354 ******************************************************************************/
355#ifdef ACPI_FUTURE_USAGE
356acpi_status acpi_install_exception_handler(acpi_exception_handler handler)
357{
358 acpi_status status;
359
360 ACPI_FUNCTION_TRACE(acpi_install_exception_handler);
361
362 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
363 if (ACPI_FAILURE(status)) {
364 return_ACPI_STATUS(status);
365 }
366
367 /* Don't allow two handlers. */
368
369 if (acpi_gbl_exception_handler) {
370 status = AE_ALREADY_EXISTS;
371 goto cleanup;
372 }
373
374 /* Install the handler */
375
376 acpi_gbl_exception_handler = handler;
377
378cleanup:
379 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
380 return_ACPI_STATUS(status);
381}
382
383ACPI_EXPORT_SYMBOL(acpi_install_exception_handler)
384#endif /* ACPI_FUTURE_USAGE */
385
386#if (!ACPI_REDUCED_HARDWARE)
387/*******************************************************************************
388 *
389 * FUNCTION: acpi_install_sci_handler
390 *
391 * PARAMETERS: address - Address of the handler
392 * context - Value passed to the handler on each SCI
393 *
394 * RETURN: Status
395 *
396 * DESCRIPTION: Install a handler for a System Control Interrupt.
397 *
398 ******************************************************************************/
399acpi_status acpi_install_sci_handler(acpi_sci_handler address, void *context)
400{
401 struct acpi_sci_handler_info *new_sci_handler;
402 struct acpi_sci_handler_info *sci_handler;
403 acpi_cpu_flags flags;
404 acpi_status status;
405
406 ACPI_FUNCTION_TRACE(acpi_install_sci_handler);
407
408 if (!address) {
409 return_ACPI_STATUS(AE_BAD_PARAMETER);
410 }
411
412 /* Allocate and init a handler object */
413
414 new_sci_handler = ACPI_ALLOCATE(sizeof(struct acpi_sci_handler_info));
415 if (!new_sci_handler) {
416 return_ACPI_STATUS(AE_NO_MEMORY);
417 }
418
419 new_sci_handler->address = address;
420 new_sci_handler->context = context;
421
422 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
423 if (ACPI_FAILURE(status)) {
424 goto exit;
425 }
426
427 /* Lock list during installation */
428
429 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
430 sci_handler = acpi_gbl_sci_handler_list;
431
432 /* Ensure handler does not already exist */
433
434 while (sci_handler) {
435 if (address == sci_handler->address) {
436 status = AE_ALREADY_EXISTS;
437 goto unlock_and_exit;
438 }
439
440 sci_handler = sci_handler->next;
441 }
442
443 /* Install the new handler into the global list (at head) */
444
445 new_sci_handler->next = acpi_gbl_sci_handler_list;
446 acpi_gbl_sci_handler_list = new_sci_handler;
447
448unlock_and_exit:
449
450 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
451 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
452
453exit:
454 if (ACPI_FAILURE(status)) {
455 ACPI_FREE(new_sci_handler);
456 }
457 return_ACPI_STATUS(status);
458}
459
460/*******************************************************************************
461 *
462 * FUNCTION: acpi_remove_sci_handler
463 *
464 * PARAMETERS: address - Address of the handler
465 *
466 * RETURN: Status
467 *
468 * DESCRIPTION: Remove a handler for a System Control Interrupt.
469 *
470 ******************************************************************************/
471
472acpi_status acpi_remove_sci_handler(acpi_sci_handler address)
473{
474 struct acpi_sci_handler_info *prev_sci_handler;
475 struct acpi_sci_handler_info *next_sci_handler;
476 acpi_cpu_flags flags;
477 acpi_status status;
478
479 ACPI_FUNCTION_TRACE(acpi_remove_sci_handler);
480
481 if (!address) {
482 return_ACPI_STATUS(AE_BAD_PARAMETER);
483 }
484
485 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
486 if (ACPI_FAILURE(status)) {
487 return_ACPI_STATUS(status);
488 }
489
490 /* Remove the SCI handler with lock */
491
492 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
493
494 prev_sci_handler = NULL;
495 next_sci_handler = acpi_gbl_sci_handler_list;
496 while (next_sci_handler) {
497 if (next_sci_handler->address == address) {
498
499 /* Unlink and free the SCI handler info block */
500
501 if (prev_sci_handler) {
502 prev_sci_handler->next = next_sci_handler->next;
503 } else {
504 acpi_gbl_sci_handler_list =
505 next_sci_handler->next;
506 }
507
508 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
509 ACPI_FREE(next_sci_handler);
510 goto unlock_and_exit;
511 }
512
513 prev_sci_handler = next_sci_handler;
514 next_sci_handler = next_sci_handler->next;
515 }
516
517 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
518 status = AE_NOT_EXIST;
519
520unlock_and_exit:
521 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
522 return_ACPI_STATUS(status);
523}
524
525/*******************************************************************************
526 *
527 * FUNCTION: acpi_install_global_event_handler
528 *
529 * PARAMETERS: handler - Pointer to the global event handler function
530 * context - Value passed to the handler on each event
531 *
532 * RETURN: Status
533 *
534 * DESCRIPTION: Saves the pointer to the handler function. The global handler
535 * is invoked upon each incoming GPE and Fixed Event. It is
536 * invoked at interrupt level at the time of the event dispatch.
537 * Can be used to update event counters, etc.
538 *
539 ******************************************************************************/
540
541acpi_status
542acpi_install_global_event_handler(acpi_gbl_event_handler handler, void *context)
543{
544 acpi_status status;
545
546 ACPI_FUNCTION_TRACE(acpi_install_global_event_handler);
547
548 /* Parameter validation */
549
550 if (!handler) {
551 return_ACPI_STATUS(AE_BAD_PARAMETER);
552 }
553
554 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
555 if (ACPI_FAILURE(status)) {
556 return_ACPI_STATUS(status);
557 }
558
559 /* Don't allow two handlers. */
560
561 if (acpi_gbl_global_event_handler) {
562 status = AE_ALREADY_EXISTS;
563 goto cleanup;
564 }
565
566 acpi_gbl_global_event_handler = handler;
567 acpi_gbl_global_event_handler_context = context;
568
569cleanup:
570 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
571 return_ACPI_STATUS(status);
572}
573
574ACPI_EXPORT_SYMBOL(acpi_install_global_event_handler)
575
576/*******************************************************************************
577 *
578 * FUNCTION: acpi_install_fixed_event_handler
579 *
580 * PARAMETERS: event - Event type to enable.
581 * handler - Pointer to the handler function for the
582 * event
583 * context - Value passed to the handler on each GPE
584 *
585 * RETURN: Status
586 *
587 * DESCRIPTION: Saves the pointer to the handler function and then enables the
588 * event.
589 *
590 ******************************************************************************/
591acpi_status
592acpi_install_fixed_event_handler(u32 event,
593 acpi_event_handler handler, void *context)
594{
595 acpi_status status;
596
597 ACPI_FUNCTION_TRACE(acpi_install_fixed_event_handler);
598
599 /* Parameter validation */
600
601 if (event > ACPI_EVENT_MAX) {
602 return_ACPI_STATUS(AE_BAD_PARAMETER);
603 }
604
605 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
606 if (ACPI_FAILURE(status)) {
607 return_ACPI_STATUS(status);
608 }
609
610 /* Do not allow multiple handlers */
611
612 if (acpi_gbl_fixed_event_handlers[event].handler) {
613 status = AE_ALREADY_EXISTS;
614 goto cleanup;
615 }
616
617 /* Install the handler before enabling the event */
618
619 acpi_gbl_fixed_event_handlers[event].handler = handler;
620 acpi_gbl_fixed_event_handlers[event].context = context;
621
622 status = acpi_clear_event(event);
623 if (ACPI_SUCCESS(status))
624 status = acpi_enable_event(event, 0);
625 if (ACPI_FAILURE(status)) {
626 ACPI_WARNING((AE_INFO,
627 "Could not enable fixed event - %s (%u)",
628 acpi_ut_get_event_name(event), event));
629
630 /* Remove the handler */
631
632 acpi_gbl_fixed_event_handlers[event].handler = NULL;
633 acpi_gbl_fixed_event_handlers[event].context = NULL;
634 } else {
635 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
636 "Enabled fixed event %s (%X), Handler=%p\n",
637 acpi_ut_get_event_name(event), event,
638 handler));
639 }
640
641cleanup:
642 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
643 return_ACPI_STATUS(status);
644}
645
646ACPI_EXPORT_SYMBOL(acpi_install_fixed_event_handler)
647
648/*******************************************************************************
649 *
650 * FUNCTION: acpi_remove_fixed_event_handler
651 *
652 * PARAMETERS: event - Event type to disable.
653 * handler - Address of the handler
654 *
655 * RETURN: Status
656 *
657 * DESCRIPTION: Disables the event and unregisters the event handler.
658 *
659 ******************************************************************************/
660acpi_status
661acpi_remove_fixed_event_handler(u32 event, acpi_event_handler handler)
662{
663 acpi_status status = AE_OK;
664
665 ACPI_FUNCTION_TRACE(acpi_remove_fixed_event_handler);
666
667 /* Parameter validation */
668
669 if (event > ACPI_EVENT_MAX) {
670 return_ACPI_STATUS(AE_BAD_PARAMETER);
671 }
672
673 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
674 if (ACPI_FAILURE(status)) {
675 return_ACPI_STATUS(status);
676 }
677
678 /* Disable the event before removing the handler */
679
680 status = acpi_disable_event(event, 0);
681
682 /* Always Remove the handler */
683
684 acpi_gbl_fixed_event_handlers[event].handler = NULL;
685 acpi_gbl_fixed_event_handlers[event].context = NULL;
686
687 if (ACPI_FAILURE(status)) {
688 ACPI_WARNING((AE_INFO,
689 "Could not disable fixed event - %s (%u)",
690 acpi_ut_get_event_name(event), event));
691 } else {
692 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
693 "Disabled fixed event - %s (%X)\n",
694 acpi_ut_get_event_name(event), event));
695 }
696
697 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
698 return_ACPI_STATUS(status);
699}
700
701ACPI_EXPORT_SYMBOL(acpi_remove_fixed_event_handler)
702
703/*******************************************************************************
704 *
705 * FUNCTION: acpi_install_gpe_handler
706 *
707 * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT
708 * defined GPEs)
709 * gpe_number - The GPE number within the GPE block
710 * type - Whether this GPE should be treated as an
711 * edge- or level-triggered interrupt.
712 * address - Address of the handler
713 * context - Value passed to the handler on each GPE
714 *
715 * RETURN: Status
716 *
717 * DESCRIPTION: Install a handler for a General Purpose Event.
718 *
719 ******************************************************************************/
720acpi_status
721acpi_install_gpe_handler(acpi_handle gpe_device,
722 u32 gpe_number,
723 u32 type, acpi_gpe_handler address, void *context)
724{
725 struct acpi_gpe_event_info *gpe_event_info;
726 struct acpi_gpe_handler_info *handler;
727 acpi_status status;
728 acpi_cpu_flags flags;
729
730 ACPI_FUNCTION_TRACE(acpi_install_gpe_handler);
731
732 /* Parameter validation */
733
734 if ((!address) || (type & ~ACPI_GPE_XRUPT_TYPE_MASK)) {
735 return_ACPI_STATUS(AE_BAD_PARAMETER);
736 }
737
738 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
739 if (ACPI_FAILURE(status)) {
740 return_ACPI_STATUS(status);
741 }
742
743 /* Allocate and init handler object (before lock) */
744
745 handler = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_handler_info));
746 if (!handler) {
747 status = AE_NO_MEMORY;
748 goto unlock_and_exit;
749 }
750
751 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
752
753 /* Ensure that we have a valid GPE number */
754
755 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
756 if (!gpe_event_info) {
757 status = AE_BAD_PARAMETER;
758 goto free_and_exit;
759 }
760
761 /* Make sure that there isn't a handler there already */
762
763 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
764 ACPI_GPE_DISPATCH_HANDLER) {
765 status = AE_ALREADY_EXISTS;
766 goto free_and_exit;
767 }
768
769 handler->address = address;
770 handler->context = context;
771 handler->method_node = gpe_event_info->dispatch.method_node;
772 handler->original_flags = (u8)(gpe_event_info->flags &
773 (ACPI_GPE_XRUPT_TYPE_MASK |
774 ACPI_GPE_DISPATCH_MASK));
775
776 /*
777 * If the GPE is associated with a method, it may have been enabled
778 * automatically during initialization, in which case it has to be
779 * disabled now to avoid spurious execution of the handler.
780 */
781
782 if ((handler->original_flags & ACPI_GPE_DISPATCH_METHOD)
783 && gpe_event_info->runtime_count) {
784 handler->originally_enabled = 1;
785 (void)acpi_ev_remove_gpe_reference(gpe_event_info);
786 }
787
788 /* Install the handler */
789
790 gpe_event_info->dispatch.handler = handler;
791
792 /* Setup up dispatch flags to indicate handler (vs. method/notify) */
793
794 gpe_event_info->flags &=
795 ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
796 gpe_event_info->flags |= (u8) (type | ACPI_GPE_DISPATCH_HANDLER);
797
798 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
799
800unlock_and_exit:
801 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
802 return_ACPI_STATUS(status);
803
804free_and_exit:
805 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
806 ACPI_FREE(handler);
807 goto unlock_and_exit;
808}
809
810ACPI_EXPORT_SYMBOL(acpi_install_gpe_handler)
811
812/*******************************************************************************
813 *
814 * FUNCTION: acpi_remove_gpe_handler
815 *
816 * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT
817 * defined GPEs)
818 * gpe_number - The event to remove a handler
819 * address - Address of the handler
820 *
821 * RETURN: Status
822 *
823 * DESCRIPTION: Remove a handler for a General Purpose acpi_event.
824 *
825 ******************************************************************************/
826acpi_status
827acpi_remove_gpe_handler(acpi_handle gpe_device,
828 u32 gpe_number, acpi_gpe_handler address)
829{
830 struct acpi_gpe_event_info *gpe_event_info;
831 struct acpi_gpe_handler_info *handler;
832 acpi_status status;
833 acpi_cpu_flags flags;
834
835 ACPI_FUNCTION_TRACE(acpi_remove_gpe_handler);
836
837 /* Parameter validation */
838
839 if (!address) {
840 return_ACPI_STATUS(AE_BAD_PARAMETER);
841 }
842
843 /* Make sure all deferred GPE tasks are completed */
844
845 acpi_os_wait_events_complete();
846
847 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
848 if (ACPI_FAILURE(status)) {
849 return_ACPI_STATUS(status);
850 }
851
852 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
853
854 /* Ensure that we have a valid GPE number */
855
856 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
857 if (!gpe_event_info) {
858 status = AE_BAD_PARAMETER;
859 goto unlock_and_exit;
860 }
861
862 /* Make sure that a handler is indeed installed */
863
864 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) !=
865 ACPI_GPE_DISPATCH_HANDLER) {
866 status = AE_NOT_EXIST;
867 goto unlock_and_exit;
868 }
869
870 /* Make sure that the installed handler is the same */
871
872 if (gpe_event_info->dispatch.handler->address != address) {
873 status = AE_BAD_PARAMETER;
874 goto unlock_and_exit;
875 }
876
877 /* Remove the handler */
878
879 handler = gpe_event_info->dispatch.handler;
880
881 /* Restore Method node (if any), set dispatch flags */
882
883 gpe_event_info->dispatch.method_node = handler->method_node;
884 gpe_event_info->flags &=
885 ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
886 gpe_event_info->flags |= handler->original_flags;
887
888 /*
889 * If the GPE was previously associated with a method and it was
890 * enabled, it should be enabled at this point to restore the
891 * post-initialization configuration.
892 */
893 if ((handler->original_flags & ACPI_GPE_DISPATCH_METHOD) &&
894 handler->originally_enabled) {
895 (void)acpi_ev_add_gpe_reference(gpe_event_info);
896 }
897
898 /* Now we can free the handler object */
899
900 ACPI_FREE(handler);
901
902unlock_and_exit:
903 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
904
905 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
906 return_ACPI_STATUS(status);
907}
908
909ACPI_EXPORT_SYMBOL(acpi_remove_gpe_handler)
910
911/*******************************************************************************
912 *
913 * FUNCTION: acpi_acquire_global_lock
914 *
915 * PARAMETERS: timeout - How long the caller is willing to wait
916 * handle - Where the handle to the lock is returned
917 * (if acquired)
918 *
919 * RETURN: Status
920 *
921 * DESCRIPTION: Acquire the ACPI Global Lock
922 *
923 * Note: Allows callers with the same thread ID to acquire the global lock
924 * multiple times. In other words, externally, the behavior of the global lock
925 * is identical to an AML mutex. On the first acquire, a new handle is
926 * returned. On any subsequent calls to acquire by the same thread, the same
927 * handle is returned.
928 *
929 ******************************************************************************/
930acpi_status acpi_acquire_global_lock(u16 timeout, u32 * handle)
931{
932 acpi_status status;
933
934 if (!handle) {
935 return (AE_BAD_PARAMETER);
936 }
937
938 /* Must lock interpreter to prevent race conditions */
939
940 acpi_ex_enter_interpreter();
941
942 status = acpi_ex_acquire_mutex_object(timeout,
943 acpi_gbl_global_lock_mutex,
944 acpi_os_get_thread_id());
945
946 if (ACPI_SUCCESS(status)) {
947
948 /* Return the global lock handle (updated in acpi_ev_acquire_global_lock) */
949
950 *handle = acpi_gbl_global_lock_handle;
951 }
952
953 acpi_ex_exit_interpreter();
954 return (status);
955}
956
957ACPI_EXPORT_SYMBOL(acpi_acquire_global_lock)
958
959/*******************************************************************************
960 *
961 * FUNCTION: acpi_release_global_lock
962 *
963 * PARAMETERS: handle - Returned from acpi_acquire_global_lock
964 *
965 * RETURN: Status
966 *
967 * DESCRIPTION: Release the ACPI Global Lock. The handle must be valid.
968 *
969 ******************************************************************************/
970acpi_status acpi_release_global_lock(u32 handle)
971{
972 acpi_status status;
973
974 if (!handle || (handle != acpi_gbl_global_lock_handle)) {
975 return (AE_NOT_ACQUIRED);
976 }
977
978 status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex);
979 return (status);
980}
981
982ACPI_EXPORT_SYMBOL(acpi_release_global_lock)
983#endif /* !ACPI_REDUCED_HARDWARE */