projects / reactos.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
history | raw | HEAD
[ACPICA]
[reactos.git] / reactos / drivers / bus / acpi / acpica / events / evgpe.c
1 /******************************************************************************
2 *
3 * Module Name: evgpe - General Purpose Event handling and dispatch
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2015, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44 #include "acpi.h"
45 #include "accommon.h"
46 #include "acevents.h"
47 #include "acnamesp.h"
48
49 #define _COMPONENT ACPI_EVENTS
50 ACPI_MODULE_NAME ("evgpe")
51
52 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
53
54 /* Local prototypes */
55
56 static void ACPI_SYSTEM_XFACE
57 AcpiEvAsynchExecuteGpeMethod (
58 void *Context);
59
60 static void ACPI_SYSTEM_XFACE
61 AcpiEvAsynchEnableGpe (
62 void *Context);
63
64
65 /*******************************************************************************
66 *
67 * FUNCTION: AcpiEvUpdateGpeEnableMask
68 *
69 * PARAMETERS: GpeEventInfo - GPE to update
70 *
71 * RETURN: Status
72 *
73 * DESCRIPTION: Updates GPE register enable mask based upon whether there are
74 * runtime references to this GPE
75 *
76 ******************************************************************************/
77
78 ACPI_STATUS
79 AcpiEvUpdateGpeEnableMask (
80 ACPI_GPE_EVENT_INFO *GpeEventInfo)
81 {
82 ACPI_GPE_REGISTER_INFO *GpeRegisterInfo;
83 UINT32 RegisterBit;
84
85
86 ACPI_FUNCTION_TRACE (EvUpdateGpeEnableMask);
87
88
89 GpeRegisterInfo = GpeEventInfo->RegisterInfo;
90 if (!GpeRegisterInfo)
91 {
92 return_ACPI_STATUS (AE_NOT_EXIST);
93 }
94
95 RegisterBit = AcpiHwGetGpeRegisterBit (GpeEventInfo);
96
97 /* Clear the run bit up front */
98
99 ACPI_CLEAR_BIT (GpeRegisterInfo->EnableForRun, RegisterBit);
100
101 /* Set the mask bit only if there are references to this GPE */
102
103 if (GpeEventInfo->RuntimeCount)
104 {
105 ACPI_SET_BIT (GpeRegisterInfo->EnableForRun, (UINT8) RegisterBit);
106 }
107
108 GpeRegisterInfo->EnableMask = GpeRegisterInfo->EnableForRun;
109 return_ACPI_STATUS (AE_OK);
110 }
111
112
113 /*******************************************************************************
114 *
115 * FUNCTION: AcpiEvEnableGpe
116 *
117 * PARAMETERS: GpeEventInfo - GPE to enable
118 *
119 * RETURN: Status
120 *
121 * DESCRIPTION: Clear a GPE of stale events and enable it.
122 *
123 ******************************************************************************/
124
125 ACPI_STATUS
126 AcpiEvEnableGpe (
127 ACPI_GPE_EVENT_INFO *GpeEventInfo)
128 {
129 ACPI_STATUS Status;
130
131
132 ACPI_FUNCTION_TRACE (EvEnableGpe);
133
134
135 /* Clear the GPE (of stale events) */
136
137 Status = AcpiHwClearGpe (GpeEventInfo);
138 if (ACPI_FAILURE (Status))
139 {
140 return_ACPI_STATUS (Status);
141 }
142
143 /* Enable the requested GPE */
144
145 Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_ENABLE);
146 return_ACPI_STATUS (Status);
147 }
148
149
150 /*******************************************************************************
151 *
152 * FUNCTION: AcpiEvAddGpeReference
153 *
154 * PARAMETERS: GpeEventInfo - Add a reference to this GPE
155 *
156 * RETURN: Status
157 *
158 * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
159 * hardware-enabled.
160 *
161 ******************************************************************************/
162
163 ACPI_STATUS
164 AcpiEvAddGpeReference (
165 ACPI_GPE_EVENT_INFO *GpeEventInfo)
166 {
167 ACPI_STATUS Status = AE_OK;
168
169
170 ACPI_FUNCTION_TRACE (EvAddGpeReference);
171
172
173 if (GpeEventInfo->RuntimeCount == ACPI_UINT8_MAX)
174 {
175 return_ACPI_STATUS (AE_LIMIT);
176 }
177
178 GpeEventInfo->RuntimeCount++;
179 if (GpeEventInfo->RuntimeCount == 1)
180 {
181 /* Enable on first reference */
182
183 Status = AcpiEvUpdateGpeEnableMask (GpeEventInfo);
184 if (ACPI_SUCCESS (Status))
185 {
186 Status = AcpiEvEnableGpe (GpeEventInfo);
187 }
188
189 if (ACPI_FAILURE (Status))
190 {
191 GpeEventInfo->RuntimeCount--;
192 }
193 }
194
195 return_ACPI_STATUS (Status);
196 }
197
198
199 /*******************************************************************************
200 *
201 * FUNCTION: AcpiEvRemoveGpeReference
202 *
203 * PARAMETERS: GpeEventInfo - Remove a reference to this GPE
204 *
205 * RETURN: Status
206 *
207 * DESCRIPTION: Remove a reference to a GPE. When the last reference is
208 * removed, the GPE is hardware-disabled.
209 *
210 ******************************************************************************/
211
212 ACPI_STATUS
213 AcpiEvRemoveGpeReference (
214 ACPI_GPE_EVENT_INFO *GpeEventInfo)
215 {
216 ACPI_STATUS Status = AE_OK;
217
218
219 ACPI_FUNCTION_TRACE (EvRemoveGpeReference);
220
221
222 if (!GpeEventInfo->RuntimeCount)
223 {
224 return_ACPI_STATUS (AE_LIMIT);
225 }
226
227 GpeEventInfo->RuntimeCount--;
228 if (!GpeEventInfo->RuntimeCount)
229 {
230 /* Disable on last reference */
231
232 Status = AcpiEvUpdateGpeEnableMask (GpeEventInfo);
233 if (ACPI_SUCCESS (Status))
234 {
235 Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_DISABLE);
236 }
237
238 if (ACPI_FAILURE (Status))
239 {
240 GpeEventInfo->RuntimeCount++;
241 }
242 }
243
244 return_ACPI_STATUS (Status);
245 }
246
247
248 /*******************************************************************************
249 *
250 * FUNCTION: AcpiEvLowGetGpeInfo
251 *
252 * PARAMETERS: GpeNumber - Raw GPE number
253 * GpeBlock - A GPE info block
254 *
255 * RETURN: A GPE EventInfo struct. NULL if not a valid GPE (The GpeNumber
256 * is not within the specified GPE block)
257 *
258 * DESCRIPTION: Returns the EventInfo struct associated with this GPE. This is
259 * the low-level implementation of EvGetGpeEventInfo.
260 *
261 ******************************************************************************/
262
263 ACPI_GPE_EVENT_INFO *
264 AcpiEvLowGetGpeInfo (
265 UINT32 GpeNumber,
266 ACPI_GPE_BLOCK_INFO *GpeBlock)
267 {
268 UINT32 GpeIndex;
269
270
271 /*
272 * Validate that the GpeNumber is within the specified GpeBlock.
273 * (Two steps)
274 */
275 if (!GpeBlock ||
276 (GpeNumber < GpeBlock->BlockBaseNumber))
277 {
278 return (NULL);
279 }
280
281 GpeIndex = GpeNumber - GpeBlock->BlockBaseNumber;
282 if (GpeIndex >= GpeBlock->GpeCount)
283 {
284 return (NULL);
285 }
286
287 return (&GpeBlock->EventInfo[GpeIndex]);
288 }
289
290
291 /*******************************************************************************
292 *
293 * FUNCTION: AcpiEvGetGpeEventInfo
294 *
295 * PARAMETERS: GpeDevice - Device node. NULL for GPE0/GPE1
296 * GpeNumber - Raw GPE number
297 *
298 * RETURN: A GPE EventInfo struct. NULL if not a valid GPE
299 *
300 * DESCRIPTION: Returns the EventInfo struct associated with this GPE.
301 * Validates the GpeBlock and the GpeNumber
302 *
303 * Should be called only when the GPE lists are semaphore locked
304 * and not subject to change.
305 *
306 ******************************************************************************/
307
308 ACPI_GPE_EVENT_INFO *
309 AcpiEvGetGpeEventInfo (
310 ACPI_HANDLE GpeDevice,
311 UINT32 GpeNumber)
312 {
313 ACPI_OPERAND_OBJECT *ObjDesc;
314 ACPI_GPE_EVENT_INFO *GpeInfo;
315 UINT32 i;
316
317
318 ACPI_FUNCTION_ENTRY ();
319
320
321 /* A NULL GpeDevice means use the FADT-defined GPE block(s) */
322
323 if (!GpeDevice)
324 {
325 /* Examine GPE Block 0 and 1 (These blocks are permanent) */
326
327 for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++)
328 {
329 GpeInfo = AcpiEvLowGetGpeInfo (GpeNumber,
330 AcpiGbl_GpeFadtBlocks[i]);
331 if (GpeInfo)
332 {
333 return (GpeInfo);
334 }
335 }
336
337 /* The GpeNumber was not in the range of either FADT GPE block */
338
339 return (NULL);
340 }
341
342 /* A Non-NULL GpeDevice means this is a GPE Block Device */
343
344 ObjDesc = AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE *) GpeDevice);
345 if (!ObjDesc ||
346 !ObjDesc->Device.GpeBlock)
347 {
348 return (NULL);
349 }
350
351 return (AcpiEvLowGetGpeInfo (GpeNumber, ObjDesc->Device.GpeBlock));
352 }
353
354
355 /*******************************************************************************
356 *
357 * FUNCTION: AcpiEvGpeDetect
358 *
359 * PARAMETERS: GpeXruptList - Interrupt block for this interrupt.
360 * Can have multiple GPE blocks attached.
361 *
362 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
363 *
364 * DESCRIPTION: Detect if any GP events have occurred. This function is
365 * executed at interrupt level.
366 *
367 ******************************************************************************/
368
369 UINT32
370 AcpiEvGpeDetect (
371 ACPI_GPE_XRUPT_INFO *GpeXruptList)
372 {
373 ACPI_STATUS Status;
374 ACPI_GPE_BLOCK_INFO *GpeBlock;
375 ACPI_NAMESPACE_NODE *GpeDevice;
376 ACPI_GPE_REGISTER_INFO *GpeRegisterInfo;
377 ACPI_GPE_EVENT_INFO *GpeEventInfo;
378 UINT32 GpeNumber;
379 ACPI_GPE_HANDLER_INFO *GpeHandlerInfo;
380 UINT32 IntStatus = ACPI_INTERRUPT_NOT_HANDLED;
381 UINT8 EnabledStatusByte;
382 UINT32 StatusReg;
383 UINT32 EnableReg;
384 ACPI_CPU_FLAGS Flags;
385 UINT32 i;
386 UINT32 j;
387
388
389 ACPI_FUNCTION_NAME (EvGpeDetect);
390
391 /* Check for the case where there are no GPEs */
392
393 if (!GpeXruptList)
394 {
395 return (IntStatus);
396 }
397
398 /*
399 * We need to obtain the GPE lock for both the data structs and registers
400 * Note: Not necessary to obtain the hardware lock, since the GPE
401 * registers are owned by the GpeLock.
402 */
403 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
404
405 /* Examine all GPE blocks attached to this interrupt level */
406
407 GpeBlock = GpeXruptList->GpeBlockListHead;
408 while (GpeBlock)
409 {
410 GpeDevice = GpeBlock->Node;
411
412 /*
413 * Read all of the 8-bit GPE status and enable registers in this GPE
414 * block, saving all of them. Find all currently active GP events.
415 */
416 for (i = 0; i < GpeBlock->RegisterCount; i++)
417 {
418 /* Get the next status/enable pair */
419
420 GpeRegisterInfo = &GpeBlock->RegisterInfo[i];
421
422 /*
423 * Optimization: If there are no GPEs enabled within this
424 * register, we can safely ignore the entire register.
425 */
426 if (!(GpeRegisterInfo->EnableForRun |
427 GpeRegisterInfo->EnableForWake))
428 {
429 ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS,
430 "Ignore disabled registers for GPE %02X-%02X: "
431 "RunEnable=%02X, WakeEnable=%02X\n",
432 GpeRegisterInfo->BaseGpeNumber,
433 GpeRegisterInfo->BaseGpeNumber + (ACPI_GPE_REGISTER_WIDTH - 1),
434 GpeRegisterInfo->EnableForRun,
435 GpeRegisterInfo->EnableForWake));
436 continue;
437 }
438
439 /* Read the Status Register */
440
441 Status = AcpiHwRead (&StatusReg, &GpeRegisterInfo->StatusAddress);
442 if (ACPI_FAILURE (Status))
443 {
444 goto UnlockAndExit;
445 }
446
447 /* Read the Enable Register */
448
449 Status = AcpiHwRead (&EnableReg, &GpeRegisterInfo->EnableAddress);
450 if (ACPI_FAILURE (Status))
451 {
452 goto UnlockAndExit;
453 }
454
455 ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS,
456 "Read registers for GPE %02X-%02X: Status=%02X, Enable=%02X, "
457 "RunEnable=%02X, WakeEnable=%02X\n",
458 GpeRegisterInfo->BaseGpeNumber,
459 GpeRegisterInfo->BaseGpeNumber + (ACPI_GPE_REGISTER_WIDTH - 1),
460 StatusReg, EnableReg,
461 GpeRegisterInfo->EnableForRun,
462 GpeRegisterInfo->EnableForWake));
463
464 /* Check if there is anything active at all in this register */
465
466 EnabledStatusByte = (UINT8) (StatusReg & EnableReg);
467 if (!EnabledStatusByte)
468 {
469 /* No active GPEs in this register, move on */
470
471 continue;
472 }
473
474 /* Now look at the individual GPEs in this byte register */
475
476 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++)
477 {
478 /* Examine one GPE bit */
479
480 GpeEventInfo = &GpeBlock->EventInfo[((ACPI_SIZE) i *
481 ACPI_GPE_REGISTER_WIDTH) + j];
482 GpeNumber = j + GpeRegisterInfo->BaseGpeNumber;
483
484 if (EnabledStatusByte & (1 << j))
485 {
486 /* Invoke global event handler if present */
487
488 AcpiGpeCount++;
489 if (AcpiGbl_GlobalEventHandler)
490 {
491 AcpiGbl_GlobalEventHandler (ACPI_EVENT_TYPE_GPE,
492 GpeDevice, GpeNumber,
493 AcpiGbl_GlobalEventHandlerContext);
494 }
495
496 /* Found an active GPE */
497
498 if (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags) ==
499 ACPI_GPE_DISPATCH_RAW_HANDLER)
500 {
501 /* Dispatch the event to a raw handler */
502
503 GpeHandlerInfo = GpeEventInfo->Dispatch.Handler;
504
505 /*
506 * There is no protection around the namespace node
507 * and the GPE handler to ensure a safe destruction
508 * because:
509 * 1. The namespace node is expected to always
510 * exist after loading a table.
511 * 2. The GPE handler is expected to be flushed by
512 * AcpiOsWaitEventsComplete() before the
513 * destruction.
514 */
515 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
516 IntStatus |= GpeHandlerInfo->Address (
517 GpeDevice, GpeNumber, GpeHandlerInfo->Context);
518 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
519 }
520 else
521 {
522 /*
523 * Dispatch the event to a standard handler or
524 * method.
525 */
526 IntStatus |= AcpiEvGpeDispatch (GpeDevice,
527 GpeEventInfo, GpeNumber);
528 }
529 }
530 }
531 }
532
533 GpeBlock = GpeBlock->Next;
534 }
535
536 UnlockAndExit:
537
538 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
539 return (IntStatus);
540 }
541
542
543 /*******************************************************************************
544 *
545 * FUNCTION: AcpiEvAsynchExecuteGpeMethod
546 *
547 * PARAMETERS: Context (GpeEventInfo) - Info for this GPE
548 *
549 * RETURN: None
550 *
551 * DESCRIPTION: Perform the actual execution of a GPE control method. This
552 * function is called from an invocation of AcpiOsExecute and
553 * therefore does NOT execute at interrupt level - so that
554 * the control method itself is not executed in the context of
555 * an interrupt handler.
556 *
557 ******************************************************************************/
558
559 static void ACPI_SYSTEM_XFACE
560 AcpiEvAsynchExecuteGpeMethod (
561 void *Context)
562 {
563 ACPI_GPE_EVENT_INFO *GpeEventInfo = Context;
564 ACPI_STATUS Status = AE_OK;
565 ACPI_EVALUATE_INFO *Info;
566 ACPI_GPE_NOTIFY_INFO *Notify;
567
568
569 ACPI_FUNCTION_TRACE (EvAsynchExecuteGpeMethod);
570
571
572 /* Do the correct dispatch - normal method or implicit notify */
573
574 switch (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags))
575 {
576 case ACPI_GPE_DISPATCH_NOTIFY:
577 /*
578 * Implicit notify.
579 * Dispatch a DEVICE_WAKE notify to the appropriate handler.
580 * NOTE: the request is queued for execution after this method
581 * completes. The notify handlers are NOT invoked synchronously
582 * from this thread -- because handlers may in turn run other
583 * control methods.
584 *
585 * June 2012: Expand implicit notify mechanism to support
586 * notifies on multiple device objects.
587 */
588 Notify = GpeEventInfo->Dispatch.NotifyList;
589 while (ACPI_SUCCESS (Status) && Notify)
590 {
591 Status = AcpiEvQueueNotifyRequest (
592 Notify->DeviceNode, ACPI_NOTIFY_DEVICE_WAKE);
593
594 Notify = Notify->Next;
595 }
596 break;
597
598 case ACPI_GPE_DISPATCH_METHOD:
599
600 /* Allocate the evaluation information block */
601
602 Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO));
603 if (!Info)
604 {
605 Status = AE_NO_MEMORY;
606 }
607 else
608 {
609 /*
610 * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the
611 * _Lxx/_Exx control method that corresponds to this GPE
612 */
613 Info->PrefixNode = GpeEventInfo->Dispatch.MethodNode;
614 Info->Flags = ACPI_IGNORE_RETURN_VALUE;
615
616 Status = AcpiNsEvaluate (Info);
617 ACPI_FREE (Info);
618 }
619
620 if (ACPI_FAILURE (Status))
621 {
622 ACPI_EXCEPTION ((AE_INFO, Status,
623 "while evaluating GPE method [%4.4s]",
624 AcpiUtGetNodeName (GpeEventInfo->Dispatch.MethodNode)));
625 }
626 break;
627
628 default:
629
630 goto ErrorExit; /* Should never happen */
631 }
632
633 /* Defer enabling of GPE until all notify handlers are done */
634
635 Status = AcpiOsExecute (OSL_NOTIFY_HANDLER,
636 AcpiEvAsynchEnableGpe, GpeEventInfo);
637 if (ACPI_SUCCESS (Status))
638 {
639 return_VOID;
640 }
641
642 ErrorExit:
643 AcpiEvAsynchEnableGpe (GpeEventInfo);
644 return_VOID;
645 }
646
647
648 /*******************************************************************************
649 *
650 * FUNCTION: AcpiEvAsynchEnableGpe
651 *
652 * PARAMETERS: Context (GpeEventInfo) - Info for this GPE
653 * Callback from AcpiOsExecute
654 *
655 * RETURN: None
656 *
657 * DESCRIPTION: Asynchronous clear/enable for GPE. This allows the GPE to
658 * complete (i.e., finish execution of Notify)
659 *
660 ******************************************************************************/
661
662 static void ACPI_SYSTEM_XFACE
663 AcpiEvAsynchEnableGpe (
664 void *Context)
665 {
666 ACPI_GPE_EVENT_INFO *GpeEventInfo = Context;
667 ACPI_CPU_FLAGS Flags;
668
669
670 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
671 (void) AcpiEvFinishGpe (GpeEventInfo);
672 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
673
674 return;
675 }
676
677
678 /*******************************************************************************
679 *
680 * FUNCTION: AcpiEvFinishGpe
681 *
682 * PARAMETERS: GpeEventInfo - Info for this GPE
683 *
684 * RETURN: Status
685 *
686 * DESCRIPTION: Clear/Enable a GPE. Common code that is used after execution
687 * of a GPE method or a synchronous or asynchronous GPE handler.
688 *
689 ******************************************************************************/
690
691 ACPI_STATUS
692 AcpiEvFinishGpe (
693 ACPI_GPE_EVENT_INFO *GpeEventInfo)
694 {
695 ACPI_STATUS Status;
696
697
698 if ((GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
699 ACPI_GPE_LEVEL_TRIGGERED)
700 {
701 /*
702 * GPE is level-triggered, we clear the GPE status bit after
703 * handling the event.
704 */
705 Status = AcpiHwClearGpe (GpeEventInfo);
706 if (ACPI_FAILURE (Status))
707 {
708 return (Status);
709 }
710 }
711
712 /*
713 * Enable this GPE, conditionally. This means that the GPE will
714 * only be physically enabled if the EnableMask bit is set
715 * in the EventInfo.
716 */
717 (void) AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_CONDITIONAL_ENABLE);
718 return (AE_OK);
719 }
720
721
722 /*******************************************************************************
723 *
724 * FUNCTION: AcpiEvGpeDispatch
725 *
726 * PARAMETERS: GpeDevice - Device node. NULL for GPE0/GPE1
727 * GpeEventInfo - Info for this GPE
728 * GpeNumber - Number relative to the parent GPE block
729 *
730 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
731 *
732 * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
733 * or method (e.g. _Lxx/_Exx) handler.
734 *
735 * This function executes at interrupt level.
736 *
737 ******************************************************************************/
738
739 UINT32
740 AcpiEvGpeDispatch (
741 ACPI_NAMESPACE_NODE *GpeDevice,
742 ACPI_GPE_EVENT_INFO *GpeEventInfo,
743 UINT32 GpeNumber)
744 {
745 ACPI_STATUS Status;
746 UINT32 ReturnValue;
747
748
749 ACPI_FUNCTION_TRACE (EvGpeDispatch);
750
751
752 /*
753 * Always disable the GPE so that it does not keep firing before
754 * any asynchronous activity completes (either from the execution
755 * of a GPE method or an asynchronous GPE handler.)
756 *
757 * If there is no handler or method to run, just disable the
758 * GPE and leave it disabled permanently to prevent further such
759 * pointless events from firing.
760 */
761 Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_DISABLE);
762 if (ACPI_FAILURE (Status))
763 {
764 ACPI_EXCEPTION ((AE_INFO, Status,
765 "Unable to disable GPE %02X", GpeNumber));
766 return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED);
767 }
768
769 /*
770 * If edge-triggered, clear the GPE status bit now. Note that
771 * level-triggered events are cleared after the GPE is serviced.
772 */
773 if ((GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
774 ACPI_GPE_EDGE_TRIGGERED)
775 {
776 Status = AcpiHwClearGpe (GpeEventInfo);
777 if (ACPI_FAILURE (Status))
778 {
779 ACPI_EXCEPTION ((AE_INFO, Status,
780 "Unable to clear GPE %02X", GpeNumber));
781 (void) AcpiHwLowSetGpe (
782 GpeEventInfo, ACPI_GPE_CONDITIONAL_ENABLE);
783 return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED);
784 }
785 }
786
787 /*
788 * Dispatch the GPE to either an installed handler or the control
789 * method associated with this GPE (_Lxx or _Exx). If a handler
790 * exists, we invoke it and do not attempt to run the method.
791 * If there is neither a handler nor a method, leave the GPE
792 * disabled.
793 */
794 switch (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags))
795 {
796 case ACPI_GPE_DISPATCH_HANDLER:
797
798 /* Invoke the installed handler (at interrupt level) */
799
800 ReturnValue = GpeEventInfo->Dispatch.Handler->Address (
801 GpeDevice, GpeNumber,
802 GpeEventInfo->Dispatch.Handler->Context);
803
804 /* If requested, clear (if level-triggered) and reenable the GPE */
805
806 if (ReturnValue & ACPI_REENABLE_GPE)
807 {
808 (void) AcpiEvFinishGpe (GpeEventInfo);
809 }
810 break;
811
812 case ACPI_GPE_DISPATCH_METHOD:
813 case ACPI_GPE_DISPATCH_NOTIFY:
814 /*
815 * Execute the method associated with the GPE
816 * NOTE: Level-triggered GPEs are cleared after the method completes.
817 */
818 Status = AcpiOsExecute (OSL_GPE_HANDLER,
819 AcpiEvAsynchExecuteGpeMethod, GpeEventInfo);
820 if (ACPI_FAILURE (Status))
821 {
822 ACPI_EXCEPTION ((AE_INFO, Status,
823 "Unable to queue handler for GPE %02X - event disabled",
824 GpeNumber));
825 }
826 break;
827
828 default:
829 /*
830 * No handler or method to run!
831 * 03/2010: This case should no longer be possible. We will not allow
832 * a GPE to be enabled if it has no handler or method.
833 */
834 ACPI_ERROR ((AE_INFO,
835 "No handler or method for GPE %02X, disabling event",
836 GpeNumber));
837 break;
838 }
839
840 return_UINT32 (ACPI_INTERRUPT_HANDLED);
841 }
842
843 #endif /* !ACPI_REDUCED_HARDWARE */
A free Windows-compatible Operating System