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[mirror_ubuntu-bionic-kernel.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 - 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
53 ACPI_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 ******************************************************************************/
79 acpi_status
80 acpi_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
210 unlock_and_exit:
211 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
212 return_ACPI_STATUS(status);
213 }
214
215 ACPI_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 ******************************************************************************/
233 acpi_status
234 acpi_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 = AE_OK;
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 /* Root Object. Global handlers are removed here */
255
256 if (device == ACPI_ROOT_OBJECT) {
257 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
258 if (handler_type & (i + 1)) {
259 status =
260 acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
261 if (ACPI_FAILURE(status)) {
262 return_ACPI_STATUS(status);
263 }
264
265 if (!acpi_gbl_global_notify[i].handler ||
266 (acpi_gbl_global_notify[i].handler !=
267 handler)) {
268 status = AE_NOT_EXIST;
269 goto unlock_and_exit;
270 }
271
272 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
273 "Removing global notify handler\n"));
274
275 acpi_gbl_global_notify[i].handler = NULL;
276 acpi_gbl_global_notify[i].context = NULL;
277
278 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
279
280 /* Make sure all deferred notify tasks are completed */
281
282 acpi_os_wait_events_complete();
283 }
284 }
285
286 return_ACPI_STATUS(AE_OK);
287 }
288
289 /* All other objects: Are Notifies allowed on this object? */
290
291 if (!acpi_ev_is_notify_object(node)) {
292 return_ACPI_STATUS(AE_TYPE);
293 }
294
295 /* Must have an existing internal object */
296
297 obj_desc = acpi_ns_get_attached_object(node);
298 if (!obj_desc) {
299 return_ACPI_STATUS(AE_NOT_EXIST);
300 }
301
302 /* Internal object exists. Find the handler and remove it */
303
304 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
305 if (handler_type & (i + 1)) {
306 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
307 if (ACPI_FAILURE(status)) {
308 return_ACPI_STATUS(status);
309 }
310
311 handler_obj = obj_desc->common_notify.notify_list[i];
312 previous_handler_obj = NULL;
313
314 /* Attempt to find the handler in the handler list */
315
316 while (handler_obj &&
317 (handler_obj->notify.handler != handler)) {
318 previous_handler_obj = handler_obj;
319 handler_obj = handler_obj->notify.next[i];
320 }
321
322 if (!handler_obj) {
323 status = AE_NOT_EXIST;
324 goto unlock_and_exit;
325 }
326
327 /* Remove the handler object from the list */
328
329 if (previous_handler_obj) { /* Handler is not at the list head */
330 previous_handler_obj->notify.next[i] =
331 handler_obj->notify.next[i];
332 } else { /* Handler is at the list head */
333
334 obj_desc->common_notify.notify_list[i] =
335 handler_obj->notify.next[i];
336 }
337
338 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
339
340 /* Make sure all deferred notify tasks are completed */
341
342 acpi_os_wait_events_complete();
343 acpi_ut_remove_reference(handler_obj);
344 }
345 }
346
347 return_ACPI_STATUS(status);
348
349 unlock_and_exit:
350 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
351 return_ACPI_STATUS(status);
352 }
353
354 ACPI_EXPORT_SYMBOL(acpi_remove_notify_handler)
355
356 /*******************************************************************************
357 *
358 * FUNCTION: acpi_install_exception_handler
359 *
360 * PARAMETERS: handler - Pointer to the handler function for the
361 * event
362 *
363 * RETURN: Status
364 *
365 * DESCRIPTION: Saves the pointer to the handler function
366 *
367 ******************************************************************************/
368 #ifdef ACPI_FUTURE_USAGE
369 acpi_status acpi_install_exception_handler(acpi_exception_handler handler)
370 {
371 acpi_status status;
372
373 ACPI_FUNCTION_TRACE(acpi_install_exception_handler);
374
375 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
376 if (ACPI_FAILURE(status)) {
377 return_ACPI_STATUS(status);
378 }
379
380 /* Don't allow two handlers. */
381
382 if (acpi_gbl_exception_handler) {
383 status = AE_ALREADY_EXISTS;
384 goto cleanup;
385 }
386
387 /* Install the handler */
388
389 acpi_gbl_exception_handler = handler;
390
391 cleanup:
392 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
393 return_ACPI_STATUS(status);
394 }
395
396 ACPI_EXPORT_SYMBOL(acpi_install_exception_handler)
397 #endif /* ACPI_FUTURE_USAGE */
398
399 #if (!ACPI_REDUCED_HARDWARE)
400 /*******************************************************************************
401 *
402 * FUNCTION: acpi_install_sci_handler
403 *
404 * PARAMETERS: address - Address of the handler
405 * context - Value passed to the handler on each SCI
406 *
407 * RETURN: Status
408 *
409 * DESCRIPTION: Install a handler for a System Control Interrupt.
410 *
411 ******************************************************************************/
412 acpi_status acpi_install_sci_handler(acpi_sci_handler address, void *context)
413 {
414 struct acpi_sci_handler_info *new_sci_handler;
415 struct acpi_sci_handler_info *sci_handler;
416 acpi_cpu_flags flags;
417 acpi_status status;
418
419 ACPI_FUNCTION_TRACE(acpi_install_sci_handler);
420
421 if (!address) {
422 return_ACPI_STATUS(AE_BAD_PARAMETER);
423 }
424
425 /* Allocate and init a handler object */
426
427 new_sci_handler = ACPI_ALLOCATE(sizeof(struct acpi_sci_handler_info));
428 if (!new_sci_handler) {
429 return_ACPI_STATUS(AE_NO_MEMORY);
430 }
431
432 new_sci_handler->address = address;
433 new_sci_handler->context = context;
434
435 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
436 if (ACPI_FAILURE(status)) {
437 goto exit;
438 }
439
440 /* Lock list during installation */
441
442 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
443 sci_handler = acpi_gbl_sci_handler_list;
444
445 /* Ensure handler does not already exist */
446
447 while (sci_handler) {
448 if (address == sci_handler->address) {
449 status = AE_ALREADY_EXISTS;
450 goto unlock_and_exit;
451 }
452
453 sci_handler = sci_handler->next;
454 }
455
456 /* Install the new handler into the global list (at head) */
457
458 new_sci_handler->next = acpi_gbl_sci_handler_list;
459 acpi_gbl_sci_handler_list = new_sci_handler;
460
461 unlock_and_exit:
462
463 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
464 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
465
466 exit:
467 if (ACPI_FAILURE(status)) {
468 ACPI_FREE(new_sci_handler);
469 }
470 return_ACPI_STATUS(status);
471 }
472
473 ACPI_EXPORT_SYMBOL(acpi_install_sci_handler)
474
475 /*******************************************************************************
476 *
477 * FUNCTION: acpi_remove_sci_handler
478 *
479 * PARAMETERS: address - Address of the handler
480 *
481 * RETURN: Status
482 *
483 * DESCRIPTION: Remove a handler for a System Control Interrupt.
484 *
485 ******************************************************************************/
486 acpi_status acpi_remove_sci_handler(acpi_sci_handler address)
487 {
488 struct acpi_sci_handler_info *prev_sci_handler;
489 struct acpi_sci_handler_info *next_sci_handler;
490 acpi_cpu_flags flags;
491 acpi_status status;
492
493 ACPI_FUNCTION_TRACE(acpi_remove_sci_handler);
494
495 if (!address) {
496 return_ACPI_STATUS(AE_BAD_PARAMETER);
497 }
498
499 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
500 if (ACPI_FAILURE(status)) {
501 return_ACPI_STATUS(status);
502 }
503
504 /* Remove the SCI handler with lock */
505
506 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
507
508 prev_sci_handler = NULL;
509 next_sci_handler = acpi_gbl_sci_handler_list;
510 while (next_sci_handler) {
511 if (next_sci_handler->address == address) {
512
513 /* Unlink and free the SCI handler info block */
514
515 if (prev_sci_handler) {
516 prev_sci_handler->next = next_sci_handler->next;
517 } else {
518 acpi_gbl_sci_handler_list =
519 next_sci_handler->next;
520 }
521
522 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
523 ACPI_FREE(next_sci_handler);
524 goto unlock_and_exit;
525 }
526
527 prev_sci_handler = next_sci_handler;
528 next_sci_handler = next_sci_handler->next;
529 }
530
531 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
532 status = AE_NOT_EXIST;
533
534 unlock_and_exit:
535 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
536 return_ACPI_STATUS(status);
537 }
538
539 ACPI_EXPORT_SYMBOL(acpi_remove_sci_handler)
540
541 /*******************************************************************************
542 *
543 * FUNCTION: acpi_install_global_event_handler
544 *
545 * PARAMETERS: handler - Pointer to the global event handler function
546 * context - Value passed to the handler on each event
547 *
548 * RETURN: Status
549 *
550 * DESCRIPTION: Saves the pointer to the handler function. The global handler
551 * is invoked upon each incoming GPE and Fixed Event. It is
552 * invoked at interrupt level at the time of the event dispatch.
553 * Can be used to update event counters, etc.
554 *
555 ******************************************************************************/
556 acpi_status
557 acpi_install_global_event_handler(acpi_gbl_event_handler handler, void *context)
558 {
559 acpi_status status;
560
561 ACPI_FUNCTION_TRACE(acpi_install_global_event_handler);
562
563 /* Parameter validation */
564
565 if (!handler) {
566 return_ACPI_STATUS(AE_BAD_PARAMETER);
567 }
568
569 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
570 if (ACPI_FAILURE(status)) {
571 return_ACPI_STATUS(status);
572 }
573
574 /* Don't allow two handlers. */
575
576 if (acpi_gbl_global_event_handler) {
577 status = AE_ALREADY_EXISTS;
578 goto cleanup;
579 }
580
581 acpi_gbl_global_event_handler = handler;
582 acpi_gbl_global_event_handler_context = context;
583
584 cleanup:
585 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
586 return_ACPI_STATUS(status);
587 }
588
589 ACPI_EXPORT_SYMBOL(acpi_install_global_event_handler)
590
591 /*******************************************************************************
592 *
593 * FUNCTION: acpi_install_fixed_event_handler
594 *
595 * PARAMETERS: event - Event type to enable.
596 * handler - Pointer to the handler function for the
597 * event
598 * context - Value passed to the handler on each GPE
599 *
600 * RETURN: Status
601 *
602 * DESCRIPTION: Saves the pointer to the handler function and then enables the
603 * event.
604 *
605 ******************************************************************************/
606 acpi_status
607 acpi_install_fixed_event_handler(u32 event,
608 acpi_event_handler handler, void *context)
609 {
610 acpi_status status;
611
612 ACPI_FUNCTION_TRACE(acpi_install_fixed_event_handler);
613
614 /* Parameter validation */
615
616 if (event > ACPI_EVENT_MAX) {
617 return_ACPI_STATUS(AE_BAD_PARAMETER);
618 }
619
620 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
621 if (ACPI_FAILURE(status)) {
622 return_ACPI_STATUS(status);
623 }
624
625 /* Do not allow multiple handlers */
626
627 if (acpi_gbl_fixed_event_handlers[event].handler) {
628 status = AE_ALREADY_EXISTS;
629 goto cleanup;
630 }
631
632 /* Install the handler before enabling the event */
633
634 acpi_gbl_fixed_event_handlers[event].handler = handler;
635 acpi_gbl_fixed_event_handlers[event].context = context;
636
637 status = acpi_clear_event(event);
638 if (ACPI_SUCCESS(status))
639 status = acpi_enable_event(event, 0);
640 if (ACPI_FAILURE(status)) {
641 ACPI_WARNING((AE_INFO,
642 "Could not enable fixed event - %s (%u)",
643 acpi_ut_get_event_name(event), event));
644
645 /* Remove the handler */
646
647 acpi_gbl_fixed_event_handlers[event].handler = NULL;
648 acpi_gbl_fixed_event_handlers[event].context = NULL;
649 } else {
650 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
651 "Enabled fixed event %s (%X), Handler=%p\n",
652 acpi_ut_get_event_name(event), event,
653 handler));
654 }
655
656 cleanup:
657 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
658 return_ACPI_STATUS(status);
659 }
660
661 ACPI_EXPORT_SYMBOL(acpi_install_fixed_event_handler)
662
663 /*******************************************************************************
664 *
665 * FUNCTION: acpi_remove_fixed_event_handler
666 *
667 * PARAMETERS: event - Event type to disable.
668 * handler - Address of the handler
669 *
670 * RETURN: Status
671 *
672 * DESCRIPTION: Disables the event and unregisters the event handler.
673 *
674 ******************************************************************************/
675 acpi_status
676 acpi_remove_fixed_event_handler(u32 event, acpi_event_handler handler)
677 {
678 acpi_status status = AE_OK;
679
680 ACPI_FUNCTION_TRACE(acpi_remove_fixed_event_handler);
681
682 /* Parameter validation */
683
684 if (event > ACPI_EVENT_MAX) {
685 return_ACPI_STATUS(AE_BAD_PARAMETER);
686 }
687
688 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
689 if (ACPI_FAILURE(status)) {
690 return_ACPI_STATUS(status);
691 }
692
693 /* Disable the event before removing the handler */
694
695 status = acpi_disable_event(event, 0);
696
697 /* Always Remove the handler */
698
699 acpi_gbl_fixed_event_handlers[event].handler = NULL;
700 acpi_gbl_fixed_event_handlers[event].context = NULL;
701
702 if (ACPI_FAILURE(status)) {
703 ACPI_WARNING((AE_INFO,
704 "Could not disable fixed event - %s (%u)",
705 acpi_ut_get_event_name(event), event));
706 } else {
707 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
708 "Disabled fixed event - %s (%X)\n",
709 acpi_ut_get_event_name(event), event));
710 }
711
712 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
713 return_ACPI_STATUS(status);
714 }
715
716 ACPI_EXPORT_SYMBOL(acpi_remove_fixed_event_handler)
717
718 /*******************************************************************************
719 *
720 * FUNCTION: acpi_install_gpe_handler
721 *
722 * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT
723 * defined GPEs)
724 * gpe_number - The GPE number within the GPE block
725 * type - Whether this GPE should be treated as an
726 * edge- or level-triggered interrupt.
727 * address - Address of the handler
728 * context - Value passed to the handler on each GPE
729 *
730 * RETURN: Status
731 *
732 * DESCRIPTION: Install a handler for a General Purpose Event.
733 *
734 ******************************************************************************/
735 acpi_status
736 acpi_install_gpe_handler(acpi_handle gpe_device,
737 u32 gpe_number,
738 u32 type, acpi_gpe_handler address, void *context)
739 {
740 struct acpi_gpe_event_info *gpe_event_info;
741 struct acpi_gpe_handler_info *handler;
742 acpi_status status;
743 acpi_cpu_flags flags;
744
745 ACPI_FUNCTION_TRACE(acpi_install_gpe_handler);
746
747 /* Parameter validation */
748
749 if ((!address) || (type & ~ACPI_GPE_XRUPT_TYPE_MASK)) {
750 return_ACPI_STATUS(AE_BAD_PARAMETER);
751 }
752
753 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
754 if (ACPI_FAILURE(status)) {
755 return_ACPI_STATUS(status);
756 }
757
758 /* Allocate and init handler object (before lock) */
759
760 handler = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_handler_info));
761 if (!handler) {
762 status = AE_NO_MEMORY;
763 goto unlock_and_exit;
764 }
765
766 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
767
768 /* Ensure that we have a valid GPE number */
769
770 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
771 if (!gpe_event_info) {
772 status = AE_BAD_PARAMETER;
773 goto free_and_exit;
774 }
775
776 /* Make sure that there isn't a handler there already */
777
778 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
779 ACPI_GPE_DISPATCH_HANDLER) {
780 status = AE_ALREADY_EXISTS;
781 goto free_and_exit;
782 }
783
784 handler->address = address;
785 handler->context = context;
786 handler->method_node = gpe_event_info->dispatch.method_node;
787 handler->original_flags = (u8)(gpe_event_info->flags &
788 (ACPI_GPE_XRUPT_TYPE_MASK |
789 ACPI_GPE_DISPATCH_MASK));
790
791 /*
792 * If the GPE is associated with a method, it may have been enabled
793 * automatically during initialization, in which case it has to be
794 * disabled now to avoid spurious execution of the handler.
795 */
796 if (((handler->original_flags & ACPI_GPE_DISPATCH_METHOD) ||
797 (handler->original_flags & ACPI_GPE_DISPATCH_NOTIFY)) &&
798 gpe_event_info->runtime_count) {
799 handler->originally_enabled = TRUE;
800 (void)acpi_ev_remove_gpe_reference(gpe_event_info);
801
802 /* Sanity check of original type against new type */
803
804 if (type !=
805 (u32)(gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK)) {
806 ACPI_WARNING((AE_INFO,
807 "GPE type mismatch (level/edge)"));
808 }
809 }
810
811 /* Install the handler */
812
813 gpe_event_info->dispatch.handler = handler;
814
815 /* Setup up dispatch flags to indicate handler (vs. method/notify) */
816
817 gpe_event_info->flags &=
818 ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
819 gpe_event_info->flags |= (u8)(type | ACPI_GPE_DISPATCH_HANDLER);
820
821 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
822
823 unlock_and_exit:
824 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
825 return_ACPI_STATUS(status);
826
827 free_and_exit:
828 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
829 ACPI_FREE(handler);
830 goto unlock_and_exit;
831 }
832
833 ACPI_EXPORT_SYMBOL(acpi_install_gpe_handler)
834
835 /*******************************************************************************
836 *
837 * FUNCTION: acpi_remove_gpe_handler
838 *
839 * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT
840 * defined GPEs)
841 * gpe_number - The event to remove a handler
842 * address - Address of the handler
843 *
844 * RETURN: Status
845 *
846 * DESCRIPTION: Remove a handler for a General Purpose acpi_event.
847 *
848 ******************************************************************************/
849 acpi_status
850 acpi_remove_gpe_handler(acpi_handle gpe_device,
851 u32 gpe_number, acpi_gpe_handler address)
852 {
853 struct acpi_gpe_event_info *gpe_event_info;
854 struct acpi_gpe_handler_info *handler;
855 acpi_status status;
856 acpi_cpu_flags flags;
857
858 ACPI_FUNCTION_TRACE(acpi_remove_gpe_handler);
859
860 /* Parameter validation */
861
862 if (!address) {
863 return_ACPI_STATUS(AE_BAD_PARAMETER);
864 }
865
866 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
867 if (ACPI_FAILURE(status)) {
868 return_ACPI_STATUS(status);
869 }
870
871 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
872
873 /* Ensure that we have a valid GPE number */
874
875 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
876 if (!gpe_event_info) {
877 status = AE_BAD_PARAMETER;
878 goto unlock_and_exit;
879 }
880
881 /* Make sure that a handler is indeed installed */
882
883 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) !=
884 ACPI_GPE_DISPATCH_HANDLER) {
885 status = AE_NOT_EXIST;
886 goto unlock_and_exit;
887 }
888
889 /* Make sure that the installed handler is the same */
890
891 if (gpe_event_info->dispatch.handler->address != address) {
892 status = AE_BAD_PARAMETER;
893 goto unlock_and_exit;
894 }
895
896 /* Remove the handler */
897
898 handler = gpe_event_info->dispatch.handler;
899
900 /* Restore Method node (if any), set dispatch flags */
901
902 gpe_event_info->dispatch.method_node = handler->method_node;
903 gpe_event_info->flags &=
904 ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
905 gpe_event_info->flags |= handler->original_flags;
906
907 /*
908 * If the GPE was previously associated with a method and it was
909 * enabled, it should be enabled at this point to restore the
910 * post-initialization configuration.
911 */
912 if (((handler->original_flags & ACPI_GPE_DISPATCH_METHOD) ||
913 (handler->original_flags & ACPI_GPE_DISPATCH_NOTIFY)) &&
914 handler->originally_enabled) {
915 (void)acpi_ev_add_gpe_reference(gpe_event_info);
916 }
917
918 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
919 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
920
921 /* Make sure all deferred GPE tasks are completed */
922
923 acpi_os_wait_events_complete();
924
925 /* Now we can free the handler object */
926
927 ACPI_FREE(handler);
928 return_ACPI_STATUS(status);
929
930 unlock_and_exit:
931 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
932
933 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
934 return_ACPI_STATUS(status);
935 }
936
937 ACPI_EXPORT_SYMBOL(acpi_remove_gpe_handler)
938
939 /*******************************************************************************
940 *
941 * FUNCTION: acpi_acquire_global_lock
942 *
943 * PARAMETERS: timeout - How long the caller is willing to wait
944 * handle - Where the handle to the lock is returned
945 * (if acquired)
946 *
947 * RETURN: Status
948 *
949 * DESCRIPTION: Acquire the ACPI Global Lock
950 *
951 * Note: Allows callers with the same thread ID to acquire the global lock
952 * multiple times. In other words, externally, the behavior of the global lock
953 * is identical to an AML mutex. On the first acquire, a new handle is
954 * returned. On any subsequent calls to acquire by the same thread, the same
955 * handle is returned.
956 *
957 ******************************************************************************/
958 acpi_status acpi_acquire_global_lock(u16 timeout, u32 *handle)
959 {
960 acpi_status status;
961
962 if (!handle) {
963 return (AE_BAD_PARAMETER);
964 }
965
966 /* Must lock interpreter to prevent race conditions */
967
968 acpi_ex_enter_interpreter();
969
970 status = acpi_ex_acquire_mutex_object(timeout,
971 acpi_gbl_global_lock_mutex,
972 acpi_os_get_thread_id());
973
974 if (ACPI_SUCCESS(status)) {
975
976 /* Return the global lock handle (updated in acpi_ev_acquire_global_lock) */
977
978 *handle = acpi_gbl_global_lock_handle;
979 }
980
981 acpi_ex_exit_interpreter();
982 return (status);
983 }
984
985 ACPI_EXPORT_SYMBOL(acpi_acquire_global_lock)
986
987 /*******************************************************************************
988 *
989 * FUNCTION: acpi_release_global_lock
990 *
991 * PARAMETERS: handle - Returned from acpi_acquire_global_lock
992 *
993 * RETURN: Status
994 *
995 * DESCRIPTION: Release the ACPI Global Lock. The handle must be valid.
996 *
997 ******************************************************************************/
998 acpi_status acpi_release_global_lock(u32 handle)
999 {
1000 acpi_status status;
1001
1002 if (!handle || (handle != acpi_gbl_global_lock_handle)) {
1003 return (AE_NOT_ACQUIRED);
1004 }
1005
1006 status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex);
1007 return (status);
1008 }
1009
1010 ACPI_EXPORT_SYMBOL(acpi_release_global_lock)
1011 #endif /* !ACPI_REDUCED_HARDWARE */
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