1 /******************************************************************************
2 *
3 * Module Name: evxface - External interfaces for ACPI events
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2011, 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
45 #define __EVXFACE_C__
46
47 #include "acpi.h"
48 #include "accommon.h"
49 #include "acnamesp.h"
50 #include "acevents.h"
51 #include "acinterp.h"
52
53 #define _COMPONENT ACPI_EVENTS
54 ACPI_MODULE_NAME ("evxface")
55
56
57 /*******************************************************************************
58 *
59 * FUNCTION: AcpiInstallExceptionHandler
60 *
61 * PARAMETERS: Handler - Pointer to the handler function for the
62 * event
63 *
64 * RETURN: Status
65 *
66 * DESCRIPTION: Saves the pointer to the handler function
67 *
68 ******************************************************************************/
69
70 ACPI_STATUS
71 AcpiInstallExceptionHandler (
72 ACPI_EXCEPTION_HANDLER Handler)
73 {
74 ACPI_STATUS Status;
75
76
77 ACPI_FUNCTION_TRACE (AcpiInstallExceptionHandler);
78
79
80 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
81 if (ACPI_FAILURE (Status))
82 {
83 return_ACPI_STATUS (Status);
84 }
85
86 /* Don't allow two handlers. */
87
88 if (AcpiGbl_ExceptionHandler)
89 {
90 Status = AE_ALREADY_EXISTS;
91 goto Cleanup;
92 }
93
94 /* Install the handler */
95
96 AcpiGbl_ExceptionHandler = Handler;
97
98 Cleanup:
99 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
100 return_ACPI_STATUS (Status);
101 }
102
103 ACPI_EXPORT_SYMBOL (AcpiInstallExceptionHandler)
104
105
106 /*******************************************************************************
107 *
108 * FUNCTION: AcpiInstallGlobalEventHandler
109 *
110 * PARAMETERS: Handler - Pointer to the global event handler function
111 * Context - Value passed to the handler on each event
112 *
113 * RETURN: Status
114 *
115 * DESCRIPTION: Saves the pointer to the handler function. The global handler
116 * is invoked upon each incoming GPE and Fixed Event. It is
117 * invoked at interrupt level at the time of the event dispatch.
118 * Can be used to update event counters, etc.
119 *
120 ******************************************************************************/
121
122 ACPI_STATUS
123 AcpiInstallGlobalEventHandler (
124 ACPI_GBL_EVENT_HANDLER Handler,
125 void *Context)
126 {
127 ACPI_STATUS Status;
128
129
130 ACPI_FUNCTION_TRACE (AcpiInstallGlobalEventHandler);
131
132
133 /* Parameter validation */
134
135 if (!Handler)
136 {
137 return_ACPI_STATUS (AE_BAD_PARAMETER);
138 }
139
140 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
141 if (ACPI_FAILURE (Status))
142 {
143 return_ACPI_STATUS (Status);
144 }
145
146 /* Don't allow two handlers. */
147
148 if (AcpiGbl_GlobalEventHandler)
149 {
150 Status = AE_ALREADY_EXISTS;
151 goto Cleanup;
152 }
153
154 AcpiGbl_GlobalEventHandler = Handler;
155 AcpiGbl_GlobalEventHandlerContext = Context;
156
157
158 Cleanup:
159 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
160 return_ACPI_STATUS (Status);
161 }
162
163 ACPI_EXPORT_SYMBOL (AcpiInstallGlobalEventHandler)
164
165
166 /*******************************************************************************
167 *
168 * FUNCTION: AcpiInstallFixedEventHandler
169 *
170 * PARAMETERS: Event - Event type to enable.
171 * Handler - Pointer to the handler function for the
172 * event
173 * Context - Value passed to the handler on each GPE
174 *
175 * RETURN: Status
176 *
177 * DESCRIPTION: Saves the pointer to the handler function and then enables the
178 * event.
179 *
180 ******************************************************************************/
181
182 ACPI_STATUS
183 AcpiInstallFixedEventHandler (
184 UINT32 Event,
185 ACPI_EVENT_HANDLER Handler,
186 void *Context)
187 {
188 ACPI_STATUS Status;
189
190
191 ACPI_FUNCTION_TRACE (AcpiInstallFixedEventHandler);
192
193
194 /* Parameter validation */
195
196 if (Event > ACPI_EVENT_MAX)
197 {
198 return_ACPI_STATUS (AE_BAD_PARAMETER);
199 }
200
201 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
202 if (ACPI_FAILURE (Status))
203 {
204 return_ACPI_STATUS (Status);
205 }
206
207 /* Don't allow two handlers. */
208
209 if (NULL != AcpiGbl_FixedEventHandlers[Event].Handler)
210 {
211 Status = AE_ALREADY_EXISTS;
212 goto Cleanup;
213 }
214
215 /* Install the handler before enabling the event */
216
217 AcpiGbl_FixedEventHandlers[Event].Handler = Handler;
218 AcpiGbl_FixedEventHandlers[Event].Context = Context;
219
220 Status = AcpiEnableEvent (Event, 0);
221 if (ACPI_FAILURE (Status))
222 {
223 ACPI_WARNING ((AE_INFO, "Could not enable fixed event 0x%X", Event));
224
225 /* Remove the handler */
226
227 AcpiGbl_FixedEventHandlers[Event].Handler = NULL;
228 AcpiGbl_FixedEventHandlers[Event].Context = NULL;
229 }
230 else
231 {
232 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
233 "Enabled fixed event %X, Handler=%p\n", Event, Handler));
234 }
235
236
237 Cleanup:
238 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
239 return_ACPI_STATUS (Status);
240 }
241
242 ACPI_EXPORT_SYMBOL (AcpiInstallFixedEventHandler)
243
244
245 /*******************************************************************************
246 *
247 * FUNCTION: AcpiRemoveFixedEventHandler
248 *
249 * PARAMETERS: Event - Event type to disable.
250 * Handler - Address of the handler
251 *
252 * RETURN: Status
253 *
254 * DESCRIPTION: Disables the event and unregisters the event handler.
255 *
256 ******************************************************************************/
257
258 ACPI_STATUS
259 AcpiRemoveFixedEventHandler (
260 UINT32 Event,
261 ACPI_EVENT_HANDLER Handler)
262 {
263 ACPI_STATUS Status = AE_OK;
264
265
266 ACPI_FUNCTION_TRACE (AcpiRemoveFixedEventHandler);
267
268
269 /* Parameter validation */
270
271 if (Event > ACPI_EVENT_MAX)
272 {
273 return_ACPI_STATUS (AE_BAD_PARAMETER);
274 }
275
276 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
277 if (ACPI_FAILURE (Status))
278 {
279 return_ACPI_STATUS (Status);
280 }
281
282 /* Disable the event before removing the handler */
283
284 Status = AcpiDisableEvent (Event, 0);
285
286 /* Always Remove the handler */
287
288 AcpiGbl_FixedEventHandlers[Event].Handler = NULL;
289 AcpiGbl_FixedEventHandlers[Event].Context = NULL;
290
291 if (ACPI_FAILURE (Status))
292 {
293 ACPI_WARNING ((AE_INFO,
294 "Could not write to fixed event enable register 0x%X", Event));
295 }
296 else
297 {
298 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Disabled fixed event %X\n", Event));
299 }
300
301 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
302 return_ACPI_STATUS (Status);
303 }
304
305 ACPI_EXPORT_SYMBOL (AcpiRemoveFixedEventHandler)
306
307
308 /*******************************************************************************
309 *
310 * FUNCTION: AcpiInstallNotifyHandler
311 *
312 * PARAMETERS: Device - The device for which notifies will be handled
313 * HandlerType - The type of handler:
314 * ACPI_SYSTEM_NOTIFY: SystemHandler (00-7f)
315 * ACPI_DEVICE_NOTIFY: DriverHandler (80-ff)
316 * ACPI_ALL_NOTIFY: both system and device
317 * Handler - Address of the handler
318 * Context - Value passed to the handler on each GPE
319 *
320 * RETURN: Status
321 *
322 * DESCRIPTION: Install a handler for notifies on an ACPI device
323 *
324 ******************************************************************************/
325
326 ACPI_STATUS
327 AcpiInstallNotifyHandler (
328 ACPI_HANDLE Device,
329 UINT32 HandlerType,
330 ACPI_NOTIFY_HANDLER Handler,
331 void *Context)
332 {
333 ACPI_OPERAND_OBJECT *ObjDesc;
334 ACPI_OPERAND_OBJECT *NotifyObj;
335 ACPI_NAMESPACE_NODE *Node;
336 ACPI_STATUS Status;
337
338
339 ACPI_FUNCTION_TRACE (AcpiInstallNotifyHandler);
340
341
342 /* Parameter validation */
343
344 if ((!Device) ||
345 (!Handler) ||
346 (HandlerType > ACPI_MAX_NOTIFY_HANDLER_TYPE))
347 {
348 return_ACPI_STATUS (AE_BAD_PARAMETER);
349 }
350
351 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
352 if (ACPI_FAILURE (Status))
353 {
354 return_ACPI_STATUS (Status);
355 }
356
357 /* Convert and validate the device handle */
358
359 Node = AcpiNsValidateHandle (Device);
360 if (!Node)
361 {
362 Status = AE_BAD_PARAMETER;
363 goto UnlockAndExit;
364 }
365
366 /*
367 * Root Object:
368 * Registering a notify handler on the root object indicates that the
369 * caller wishes to receive notifications for all objects. Note that
370 * only one <external> global handler can be regsitered (per notify type).
371 */
372 if (Device == ACPI_ROOT_OBJECT)
373 {
374 /* Make sure the handler is not already installed */
375
376 if (((HandlerType & ACPI_SYSTEM_NOTIFY) &&
377 AcpiGbl_SystemNotify.Handler) ||
378 ((HandlerType & ACPI_DEVICE_NOTIFY) &&
379 AcpiGbl_DeviceNotify.Handler))
380 {
381 Status = AE_ALREADY_EXISTS;
382 goto UnlockAndExit;
383 }
384
385 if (HandlerType & ACPI_SYSTEM_NOTIFY)
386 {
387 AcpiGbl_SystemNotify.Node = Node;
388 AcpiGbl_SystemNotify.Handler = Handler;
389 AcpiGbl_SystemNotify.Context = Context;
390 }
391
392 if (HandlerType & ACPI_DEVICE_NOTIFY)
393 {
394 AcpiGbl_DeviceNotify.Node = Node;
395 AcpiGbl_DeviceNotify.Handler = Handler;
396 AcpiGbl_DeviceNotify.Context = Context;
397 }
398
399 /* Global notify handler installed */
400 }
401
402 /*
403 * All Other Objects:
404 * Caller will only receive notifications specific to the target object.
405 * Note that only certain object types can receive notifications.
406 */
407 else
408 {
409 /* Notifies allowed on this object? */
410
411 if (!AcpiEvIsNotifyObject (Node))
412 {
413 Status = AE_TYPE;
414 goto UnlockAndExit;
415 }
416
417 /* Check for an existing internal object */
418
419 ObjDesc = AcpiNsGetAttachedObject (Node);
420 if (ObjDesc)
421 {
422 /* Object exists - make sure there's no handler */
423
424 if (((HandlerType & ACPI_SYSTEM_NOTIFY) &&
425 ObjDesc->CommonNotify.SystemNotify) ||
426 ((HandlerType & ACPI_DEVICE_NOTIFY) &&
427 ObjDesc->CommonNotify.DeviceNotify))
428 {
429 Status = AE_ALREADY_EXISTS;
430 goto UnlockAndExit;
431 }
432 }
433 else
434 {
435 /* Create a new object */
436
437 ObjDesc = AcpiUtCreateInternalObject (Node->Type);
438 if (!ObjDesc)
439 {
440 Status = AE_NO_MEMORY;
441 goto UnlockAndExit;
442 }
443
444 /* Attach new object to the Node */
445
446 Status = AcpiNsAttachObject (Device, ObjDesc, Node->Type);
447
448 /* Remove local reference to the object */
449
450 AcpiUtRemoveReference (ObjDesc);
451 if (ACPI_FAILURE (Status))
452 {
453 goto UnlockAndExit;
454 }
455 }
456
457 /* Install the handler */
458
459 NotifyObj = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_NOTIFY);
460 if (!NotifyObj)
461 {
462 Status = AE_NO_MEMORY;
463 goto UnlockAndExit;
464 }
465
466 NotifyObj->Notify.Node = Node;
467 NotifyObj->Notify.Handler = Handler;
468 NotifyObj->Notify.Context = Context;
469
470 if (HandlerType & ACPI_SYSTEM_NOTIFY)
471 {
472 ObjDesc->CommonNotify.SystemNotify = NotifyObj;
473 }
474
475 if (HandlerType & ACPI_DEVICE_NOTIFY)
476 {
477 ObjDesc->CommonNotify.DeviceNotify = NotifyObj;
478 }
479
480 if (HandlerType == ACPI_ALL_NOTIFY)
481 {
482 /* Extra ref if installed in both */
483
484 AcpiUtAddReference (NotifyObj);
485 }
486 }
487
488
489 UnlockAndExit:
490 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
491 return_ACPI_STATUS (Status);
492 }
493
494 ACPI_EXPORT_SYMBOL (AcpiInstallNotifyHandler)
495
496
497 /*******************************************************************************
498 *
499 * FUNCTION: AcpiRemoveNotifyHandler
500 *
501 * PARAMETERS: Device - The device for which notifies will be handled
502 * HandlerType - The type of handler:
503 * ACPI_SYSTEM_NOTIFY: SystemHandler (00-7f)
504 * ACPI_DEVICE_NOTIFY: DriverHandler (80-ff)
505 * ACPI_ALL_NOTIFY: both system and device
506 * Handler - Address of the handler
507 *
508 * RETURN: Status
509 *
510 * DESCRIPTION: Remove a handler for notifies on an ACPI device
511 *
512 ******************************************************************************/
513
514 ACPI_STATUS
515 AcpiRemoveNotifyHandler (
516 ACPI_HANDLE Device,
517 UINT32 HandlerType,
518 ACPI_NOTIFY_HANDLER Handler)
519 {
520 ACPI_OPERAND_OBJECT *NotifyObj;
521 ACPI_OPERAND_OBJECT *ObjDesc;
522 ACPI_NAMESPACE_NODE *Node;
523 ACPI_STATUS Status;
524
525
526 ACPI_FUNCTION_TRACE (AcpiRemoveNotifyHandler);
527
528
529 /* Parameter validation */
530
531 if ((!Device) ||
532 (!Handler) ||
533 (HandlerType > ACPI_MAX_NOTIFY_HANDLER_TYPE))
534 {
535 return_ACPI_STATUS (AE_BAD_PARAMETER);
536 }
537
538 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
539 if (ACPI_FAILURE (Status))
540 {
541 return_ACPI_STATUS (Status);
542 }
543
544 /* Convert and validate the device handle */
545
546 Node = AcpiNsValidateHandle (Device);
547 if (!Node)
548 {
549 Status = AE_BAD_PARAMETER;
550 goto UnlockAndExit;
551 }
552
553 /* Root Object */
554
555 if (Device == ACPI_ROOT_OBJECT)
556 {
557 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
558 "Removing notify handler for namespace root object\n"));
559
560 if (((HandlerType & ACPI_SYSTEM_NOTIFY) &&
561 !AcpiGbl_SystemNotify.Handler) ||
562 ((HandlerType & ACPI_DEVICE_NOTIFY) &&
563 !AcpiGbl_DeviceNotify.Handler))
564 {
565 Status = AE_NOT_EXIST;
566 goto UnlockAndExit;
567 }
568
569 if (HandlerType & ACPI_SYSTEM_NOTIFY)
570 {
571 AcpiGbl_SystemNotify.Node = NULL;
572 AcpiGbl_SystemNotify.Handler = NULL;
573 AcpiGbl_SystemNotify.Context = NULL;
574 }
575
576 if (HandlerType & ACPI_DEVICE_NOTIFY)
577 {
578 AcpiGbl_DeviceNotify.Node = NULL;
579 AcpiGbl_DeviceNotify.Handler = NULL;
580 AcpiGbl_DeviceNotify.Context = NULL;
581 }
582 }
583
584 /* All Other Objects */
585
586 else
587 {
588 /* Notifies allowed on this object? */
589
590 if (!AcpiEvIsNotifyObject (Node))
591 {
592 Status = AE_TYPE;
593 goto UnlockAndExit;
594 }
595
596 /* Check for an existing internal object */
597
598 ObjDesc = AcpiNsGetAttachedObject (Node);
599 if (!ObjDesc)
600 {
601 Status = AE_NOT_EXIST;
602 goto UnlockAndExit;
603 }
604
605 /* Object exists - make sure there's an existing handler */
606
607 if (HandlerType & ACPI_SYSTEM_NOTIFY)
608 {
609 NotifyObj = ObjDesc->CommonNotify.SystemNotify;
610 if (!NotifyObj)
611 {
612 Status = AE_NOT_EXIST;
613 goto UnlockAndExit;
614 }
615
616 if (NotifyObj->Notify.Handler != Handler)
617 {
618 Status = AE_BAD_PARAMETER;
619 goto UnlockAndExit;
620 }
621
622 /* Remove the handler */
623
624 ObjDesc->CommonNotify.SystemNotify = NULL;
625 AcpiUtRemoveReference (NotifyObj);
626 }
627
628 if (HandlerType & ACPI_DEVICE_NOTIFY)
629 {
630 NotifyObj = ObjDesc->CommonNotify.DeviceNotify;
631 if (!NotifyObj)
632 {
633 Status = AE_NOT_EXIST;
634 goto UnlockAndExit;
635 }
636
637 if (NotifyObj->Notify.Handler != Handler)
638 {
639 Status = AE_BAD_PARAMETER;
640 goto UnlockAndExit;
641 }
642
643 /* Remove the handler */
644
645 ObjDesc->CommonNotify.DeviceNotify = NULL;
646 AcpiUtRemoveReference (NotifyObj);
647 }
648 }
649
650
651 UnlockAndExit:
652 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
653 return_ACPI_STATUS (Status);
654 }
655
656 ACPI_EXPORT_SYMBOL (AcpiRemoveNotifyHandler)
657
658
659 /*******************************************************************************
660 *
661 * FUNCTION: AcpiInstallGpeHandler
662 *
663 * PARAMETERS: GpeDevice - Namespace node for the GPE (NULL for FADT
664 * defined GPEs)
665 * GpeNumber - The GPE number within the GPE block
666 * Type - Whether this GPE should be treated as an
667 * edge- or level-triggered interrupt.
668 * Address - Address of the handler
669 * Context - Value passed to the handler on each GPE
670 *
671 * RETURN: Status
672 *
673 * DESCRIPTION: Install a handler for a General Purpose Event.
674 *
675 ******************************************************************************/
676
677 ACPI_STATUS
678 AcpiInstallGpeHandler (
679 ACPI_HANDLE GpeDevice,
680 UINT32 GpeNumber,
681 UINT32 Type,
682 ACPI_GPE_HANDLER Address,
683 void *Context)
684 {
685 ACPI_GPE_EVENT_INFO *GpeEventInfo;
686 ACPI_GPE_HANDLER_INFO *Handler;
687 ACPI_STATUS Status;
688 ACPI_CPU_FLAGS Flags;
689
690
691 ACPI_FUNCTION_TRACE (AcpiInstallGpeHandler);
692
693
694 /* Parameter validation */
695
696 if ((!Address) || (Type & ~ACPI_GPE_XRUPT_TYPE_MASK))
697 {
698 return_ACPI_STATUS (AE_BAD_PARAMETER);
699 }
700
701 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
702 if (ACPI_FAILURE (Status))
703 {
704 return_ACPI_STATUS (Status);
705 }
706
707 /* Allocate and init handler object (before lock) */
708
709 Handler = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_GPE_HANDLER_INFO));
710 if (!Handler)
711 {
712 Status = AE_NO_MEMORY;
713 goto UnlockAndExit;
714 }
715
716 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
717
718 /* Ensure that we have a valid GPE number */
719
720 GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber);
721 if (!GpeEventInfo)
722 {
723 Status = AE_BAD_PARAMETER;
724 goto FreeAndExit;
725 }
726
727 /* Make sure that there isn't a handler there already */
728
729 if ((GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) ==
730 ACPI_GPE_DISPATCH_HANDLER)
731 {
732 Status = AE_ALREADY_EXISTS;
733 goto FreeAndExit;
734 }
735
736 Handler->Address = Address;
737 Handler->Context = Context;
738 Handler->MethodNode = GpeEventInfo->Dispatch.MethodNode;
739 Handler->OriginalFlags = (UINT8) (GpeEventInfo->Flags &
740 (ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK));
741
742 /*
743 * If the GPE is associated with a method, it may have been enabled
744 * automatically during initialization, in which case it has to be
745 * disabled now to avoid spurious execution of the handler.
746 */
747 if (((Handler->OriginalFlags & ACPI_GPE_DISPATCH_METHOD) ||
748 (Handler->OriginalFlags & ACPI_GPE_DISPATCH_NOTIFY)) &&
749 GpeEventInfo->RuntimeCount)
750 {
751 Handler->OriginallyEnabled = TRUE;
752 (void) AcpiEvRemoveGpeReference (GpeEventInfo);
753
754 /* Sanity check of original type against new type */
755
756 if (Type != (UINT32) (GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK))
757 {
758 ACPI_WARNING ((AE_INFO, "GPE type mismatch (level/edge)"));
759 }
760 }
761
762 /* Install the handler */
763
764 GpeEventInfo->Dispatch.Handler = Handler;
765
766 /* Setup up dispatch flags to indicate handler (vs. method/notify) */
767
768 GpeEventInfo->Flags &= ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
769 GpeEventInfo->Flags |= (UINT8) (Type | ACPI_GPE_DISPATCH_HANDLER);
770
771 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
772
773
774 UnlockAndExit:
775 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
776 return_ACPI_STATUS (Status);
777
778 FreeAndExit:
779 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
780 ACPI_FREE (Handler);
781 goto UnlockAndExit;
782 }
783
784 ACPI_EXPORT_SYMBOL (AcpiInstallGpeHandler)
785
786
787 /*******************************************************************************
788 *
789 * FUNCTION: AcpiRemoveGpeHandler
790 *
791 * PARAMETERS: GpeDevice - Namespace node for the GPE (NULL for FADT
792 * defined GPEs)
793 * GpeNumber - The event to remove a handler
794 * Address - Address of the handler
795 *
796 * RETURN: Status
797 *
798 * DESCRIPTION: Remove a handler for a General Purpose AcpiEvent.
799 *
800 ******************************************************************************/
801
802 ACPI_STATUS
803 AcpiRemoveGpeHandler (
804 ACPI_HANDLE GpeDevice,
805 UINT32 GpeNumber,
806 ACPI_GPE_HANDLER Address)
807 {
808 ACPI_GPE_EVENT_INFO *GpeEventInfo;
809 ACPI_GPE_HANDLER_INFO *Handler;
810 ACPI_STATUS Status;
811 ACPI_CPU_FLAGS Flags;
812
813
814 ACPI_FUNCTION_TRACE (AcpiRemoveGpeHandler);
815
816
817 /* Parameter validation */
818
819 if (!Address)
820 {
821 return_ACPI_STATUS (AE_BAD_PARAMETER);
822 }
823
824 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
825 if (ACPI_FAILURE (Status))
826 {
827 return_ACPI_STATUS (Status);
828 }
829
830 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
831
832 /* Ensure that we have a valid GPE number */
833
834 GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber);
835 if (!GpeEventInfo)
836 {
837 Status = AE_BAD_PARAMETER;
838 goto UnlockAndExit;
839 }
840
841 /* Make sure that a handler is indeed installed */
842
843 if ((GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) !=
844 ACPI_GPE_DISPATCH_HANDLER)
845 {
846 Status = AE_NOT_EXIST;
847 goto UnlockAndExit;
848 }
849
850 /* Make sure that the installed handler is the same */
851
852 if (GpeEventInfo->Dispatch.Handler->Address != Address)
853 {
854 Status = AE_BAD_PARAMETER;
855 goto UnlockAndExit;
856 }
857
858 /* Remove the handler */
859
860 Handler = GpeEventInfo->Dispatch.Handler;
861
862 /* Restore Method node (if any), set dispatch flags */
863
864 GpeEventInfo->Dispatch.MethodNode = Handler->MethodNode;
865 GpeEventInfo->Flags &=
866 ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
867 GpeEventInfo->Flags |= Handler->OriginalFlags;
868
869 /*
870 * If the GPE was previously associated with a method and it was
871 * enabled, it should be enabled at this point to restore the
872 * post-initialization configuration.
873 */
874 if ((Handler->OriginalFlags & ACPI_GPE_DISPATCH_METHOD) &&
875 Handler->OriginallyEnabled)
876 {
877 (void) AcpiEvAddGpeReference (GpeEventInfo);
878 }
879
880 /* Now we can free the handler object */
881
882 ACPI_FREE (Handler);
883
884
885 UnlockAndExit:
886 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
887 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
888 return_ACPI_STATUS (Status);
889 }
890
891 ACPI_EXPORT_SYMBOL (AcpiRemoveGpeHandler)
892
893
894 /*******************************************************************************
895 *
896 * FUNCTION: AcpiAcquireGlobalLock
897 *
898 * PARAMETERS: Timeout - How long the caller is willing to wait
899 * Handle - Where the handle to the lock is returned
900 * (if acquired)
901 *
902 * RETURN: Status
903 *
904 * DESCRIPTION: Acquire the ACPI Global Lock
905 *
906 * Note: Allows callers with the same thread ID to acquire the global lock
907 * multiple times. In other words, externally, the behavior of the global lock
908 * is identical to an AML mutex. On the first acquire, a new handle is
909 * returned. On any subsequent calls to acquire by the same thread, the same
910 * handle is returned.
911 *
912 ******************************************************************************/
913
914 ACPI_STATUS
915 AcpiAcquireGlobalLock (
916 UINT16 Timeout,
917 UINT32 *Handle)
918 {
919 ACPI_STATUS Status;
920
921
922 if (!Handle)
923 {
924 return (AE_BAD_PARAMETER);
925 }
926
927 /* Must lock interpreter to prevent race conditions */
928
929 AcpiExEnterInterpreter ();
930
931 Status = AcpiExAcquireMutexObject (Timeout,
932 AcpiGbl_GlobalLockMutex, AcpiOsGetThreadId ());
933
934 if (ACPI_SUCCESS (Status))
935 {
936 /* Return the global lock handle (updated in AcpiEvAcquireGlobalLock) */
937
938 *Handle = AcpiGbl_GlobalLockHandle;
939 }
940
941 AcpiExExitInterpreter ();
942 return (Status);
943 }
944
945 ACPI_EXPORT_SYMBOL (AcpiAcquireGlobalLock)
946
947
948 /*******************************************************************************
949 *
950 * FUNCTION: AcpiReleaseGlobalLock
951 *
952 * PARAMETERS: Handle - Returned from AcpiAcquireGlobalLock
953 *
954 * RETURN: Status
955 *
956 * DESCRIPTION: Release the ACPI Global Lock. The handle must be valid.
957 *
958 ******************************************************************************/
959
960 ACPI_STATUS
961 AcpiReleaseGlobalLock (
962 UINT32 Handle)
963 {
964 ACPI_STATUS Status;
965
966
967 if (!Handle || (Handle != AcpiGbl_GlobalLockHandle))
968 {
969 return (AE_NOT_ACQUIRED);
970 }
971
972 Status = AcpiExReleaseMutexObject (AcpiGbl_GlobalLockMutex);
973 return (Status);
974 }
975
976 ACPI_EXPORT_SYMBOL (AcpiReleaseGlobalLock)
977