1 /******************************************************************************
2 *
3 * Module Name: evxfgpe - External Interfaces for General Purpose Events (GPEs)
4 *
5 *****************************************************************************/
6
7 /******************************************************************************
8 *
9 * 1. Copyright Notice
10 *
11 * Some or all of this work - Copyright (c) 1999 - 2023, Intel Corp.
12 * All rights reserved.
13 *
14 * 2. License
15 *
16 * 2.1. This is your license from Intel Corp. under its intellectual property
17 * rights. You may have additional license terms from the party that provided
18 * you this software, covering your right to use that party's intellectual
19 * property rights.
20 *
21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
22 * copy of the source code appearing in this file ("Covered Code") an
23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
24 * base code distributed originally by Intel ("Original Intel Code") to copy,
25 * make derivatives, distribute, use and display any portion of the Covered
26 * Code in any form, with the right to sublicense such rights; and
27 *
28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
29 * license (with the right to sublicense), under only those claims of Intel
30 * patents that are infringed by the Original Intel Code, to make, use, sell,
31 * offer to sell, and import the Covered Code and derivative works thereof
32 * solely to the minimum extent necessary to exercise the above copyright
33 * license, and in no event shall the patent license extend to any additions
34 * to or modifications of the Original Intel Code. No other license or right
35 * is granted directly or by implication, estoppel or otherwise;
36 *
37 * The above copyright and patent license is granted only if the following
38 * conditions are met:
39 *
40 * 3. Conditions
41 *
42 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
43 * Redistribution of source code of any substantial portion of the Covered
44 * Code or modification with rights to further distribute source must include
45 * the above Copyright Notice, the above License, this list of Conditions,
46 * and the following Disclaimer and Export Compliance provision. In addition,
47 * Licensee must cause all Covered Code to which Licensee contributes to
48 * contain a file documenting the changes Licensee made to create that Covered
49 * Code and the date of any change. Licensee must include in that file the
50 * documentation of any changes made by any predecessor Licensee. Licensee
51 * must include a prominent statement that the modification is derived,
52 * directly or indirectly, from Original Intel Code.
53 *
54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
55 * Redistribution of source code of any substantial portion of the Covered
56 * Code or modification without rights to further distribute source must
57 * include the following Disclaimer and Export Compliance provision in the
58 * documentation and/or other materials provided with distribution. In
59 * addition, Licensee may not authorize further sublicense of source of any
60 * portion of the Covered Code, and must include terms to the effect that the
61 * license from Licensee to its licensee is limited to the intellectual
62 * property embodied in the software Licensee provides to its licensee, and
63 * not to intellectual property embodied in modifications its licensee may
64 * make.
65 *
66 * 3.3. Redistribution of Executable. Redistribution in executable form of any
67 * substantial portion of the Covered Code or modification must reproduce the
68 * above Copyright Notice, and the following Disclaimer and Export Compliance
69 * provision in the documentation and/or other materials provided with the
70 * distribution.
71 *
72 * 3.4. Intel retains all right, title, and interest in and to the Original
73 * Intel Code.
74 *
75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
76 * Intel shall be used in advertising or otherwise to promote the sale, use or
77 * other dealings in products derived from or relating to the Covered Code
78 * without prior written authorization from Intel.
79 *
80 * 4. Disclaimer and Export Compliance
81 *
82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
88 * PARTICULAR PURPOSE.
89 *
90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
97 * LIMITED REMEDY.
98 *
99 * 4.3. Licensee shall not export, either directly or indirectly, any of this
100 * software or system incorporating such software without first obtaining any
101 * required license or other approval from the U. S. Department of Commerce or
102 * any other agency or department of the United States Government. In the
103 * event Licensee exports any such software from the United States or
104 * re-exports any such software from a foreign destination, Licensee shall
105 * ensure that the distribution and export/re-export of the software is in
106 * compliance with all laws, regulations, orders, or other restrictions of the
107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
108 * any of its subsidiaries will export/re-export any technical data, process,
109 * software, or service, directly or indirectly, to any country for which the
110 * United States government or any agency thereof requires an export license,
111 * other governmental approval, or letter of assurance, without first obtaining
112 * such license, approval or letter.
113 *
114 *****************************************************************************
115 *
116 * Alternatively, you may choose to be licensed under the terms of the
117 * following license:
118 *
119 * Redistribution and use in source and binary forms, with or without
120 * modification, are permitted provided that the following conditions
121 * are met:
122 * 1. Redistributions of source code must retain the above copyright
123 * notice, this list of conditions, and the following disclaimer,
124 * without modification.
125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
126 * substantially similar to the "NO WARRANTY" disclaimer below
127 * ("Disclaimer") and any redistribution must be conditioned upon
128 * including a substantially similar Disclaimer requirement for further
129 * binary redistribution.
130 * 3. Neither the names of the above-listed copyright holders nor the names
131 * of any contributors may be used to endorse or promote products derived
132 * from this software without specific prior written permission.
133 *
134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
145 *
146 * Alternatively, you may choose to be licensed under the terms of the
147 * GNU General Public License ("GPL") version 2 as published by the Free
148 * Software Foundation.
149 *
150 *****************************************************************************/
151
152 #define EXPORT_ACPI_INTERFACES
153
154 #include "acpi.h"
155 #include "accommon.h"
156 #include "acevents.h"
157 #include "acnamesp.h"
158
159 #define _COMPONENT ACPI_EVENTS
160 ACPI_MODULE_NAME ("evxfgpe")
161
162
163 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
164 /*******************************************************************************
165 *
166 * FUNCTION: AcpiUpdateAllGpes
167 *
168 * PARAMETERS: None
169 *
170 * RETURN: Status
171 *
172 * DESCRIPTION: Complete GPE initialization and enable all GPEs that have
173 * associated _Lxx or _Exx methods and are not pointed to by any
174 * device _PRW methods (this indicates that these GPEs are
175 * generally intended for system or device wakeup. Such GPEs
176 * have to be enabled directly when the devices whose _PRW
177 * methods point to them are set up for wakeup signaling.)
178 *
179 * NOTE: Should be called after any GPEs are added to the system. Primarily,
180 * after the system _PRW methods have been run, but also after a GPE Block
181 * Device has been added or if any new GPE methods have been added via a
182 * dynamic table load.
183 *
184 ******************************************************************************/
185
186 ACPI_STATUS
AcpiUpdateAllGpes(void)187 AcpiUpdateAllGpes (
188 void)
189 {
190 ACPI_STATUS Status;
191 BOOLEAN IsPollingNeeded = FALSE;
192
193
194 ACPI_FUNCTION_TRACE (AcpiUpdateAllGpes);
195
196
197 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
198 if (ACPI_FAILURE (Status))
199 {
200 return_ACPI_STATUS (Status);
201 }
202
203 if (AcpiGbl_AllGpesInitialized)
204 {
205 goto UnlockAndExit;
206 }
207
208 Status = AcpiEvWalkGpeList (AcpiEvInitializeGpeBlock,
209 &IsPollingNeeded);
210 if (ACPI_SUCCESS (Status))
211 {
212 AcpiGbl_AllGpesInitialized = TRUE;
213 }
214
215 UnlockAndExit:
216 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
217
218 if (IsPollingNeeded && AcpiGbl_AllGpesInitialized)
219 {
220 /* Poll GPEs to handle already triggered events */
221
222 AcpiEvGpeDetect (AcpiGbl_GpeXruptListHead);
223 }
224 return_ACPI_STATUS (Status);
225 }
226
ACPI_EXPORT_SYMBOL(AcpiUpdateAllGpes)227 ACPI_EXPORT_SYMBOL (AcpiUpdateAllGpes)
228
229
230 /*******************************************************************************
231 *
232 * FUNCTION: AcpiEnableGpe
233 *
234 * PARAMETERS: GpeDevice - Parent GPE Device. NULL for GPE0/GPE1
235 * GpeNumber - GPE level within the GPE block
236 *
237 * RETURN: Status
238 *
239 * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
240 * hardware-enabled.
241 *
242 ******************************************************************************/
243
244 ACPI_STATUS
245 AcpiEnableGpe (
246 ACPI_HANDLE GpeDevice,
247 UINT32 GpeNumber)
248 {
249 ACPI_STATUS Status = AE_BAD_PARAMETER;
250 ACPI_GPE_EVENT_INFO *GpeEventInfo;
251 ACPI_CPU_FLAGS Flags;
252
253
254 ACPI_FUNCTION_TRACE (AcpiEnableGpe);
255
256
257 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
258
259 /*
260 * Ensure that we have a valid GPE number and that there is some way
261 * of handling the GPE (handler or a GPE method). In other words, we
262 * won't allow a valid GPE to be enabled if there is no way to handle it.
263 */
264 GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber);
265 if (GpeEventInfo)
266 {
267 if (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags) !=
268 ACPI_GPE_DISPATCH_NONE)
269 {
270 Status = AcpiEvAddGpeReference (GpeEventInfo, TRUE);
271 if (ACPI_SUCCESS (Status) &&
272 ACPI_GPE_IS_POLLING_NEEDED (GpeEventInfo))
273 {
274 /* Poll edge-triggered GPEs to handle existing events */
275
276 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
277 (void) AcpiEvDetectGpe (
278 GpeDevice, GpeEventInfo, GpeNumber);
279 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
280 }
281 }
282 else
283 {
284 Status = AE_NO_HANDLER;
285 }
286 }
287
288 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
289 return_ACPI_STATUS (Status);
290 }
291
ACPI_EXPORT_SYMBOL(AcpiEnableGpe)292 ACPI_EXPORT_SYMBOL (AcpiEnableGpe)
293
294
295 /*******************************************************************************
296 *
297 * FUNCTION: AcpiDisableGpe
298 *
299 * PARAMETERS: GpeDevice - Parent GPE Device. NULL for GPE0/GPE1
300 * GpeNumber - GPE level within the GPE block
301 *
302 * RETURN: Status
303 *
304 * DESCRIPTION: Remove a reference to a GPE. When the last reference is
305 * removed, only then is the GPE disabled (for runtime GPEs), or
306 * the GPE mask bit disabled (for wake GPEs)
307 *
308 ******************************************************************************/
309
310 ACPI_STATUS
311 AcpiDisableGpe (
312 ACPI_HANDLE GpeDevice,
313 UINT32 GpeNumber)
314 {
315 ACPI_STATUS Status = AE_BAD_PARAMETER;
316 ACPI_GPE_EVENT_INFO *GpeEventInfo;
317 ACPI_CPU_FLAGS Flags;
318
319
320 ACPI_FUNCTION_TRACE (AcpiDisableGpe);
321
322
323 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
324
325 /* Ensure that we have a valid GPE number */
326
327 GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber);
328 if (GpeEventInfo)
329 {
330 Status = AcpiEvRemoveGpeReference (GpeEventInfo);
331 }
332
333 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
334 return_ACPI_STATUS (Status);
335 }
336
ACPI_EXPORT_SYMBOL(AcpiDisableGpe)337 ACPI_EXPORT_SYMBOL (AcpiDisableGpe)
338
339
340 /*******************************************************************************
341 *
342 * FUNCTION: AcpiSetGpe
343 *
344 * PARAMETERS: GpeDevice - Parent GPE Device. NULL for GPE0/GPE1
345 * GpeNumber - GPE level within the GPE block
346 * Action - ACPI_GPE_ENABLE or ACPI_GPE_DISABLE
347 *
348 * RETURN: Status
349 *
350 * DESCRIPTION: Enable or disable an individual GPE. This function bypasses
351 * the reference count mechanism used in the AcpiEnableGpe(),
352 * AcpiDisableGpe() interfaces.
353 * This API is typically used by the GPE raw handler mode driver
354 * to switch between the polling mode and the interrupt mode after
355 * the driver has enabled the GPE.
356 * The APIs should be invoked in this order:
357 * AcpiEnableGpe() <- Ensure the reference count > 0
358 * AcpiSetGpe(ACPI_GPE_DISABLE) <- Enter polling mode
359 * AcpiSetGpe(ACPI_GPE_ENABLE) <- Leave polling mode
360 * AcpiDisableGpe() <- Decrease the reference count
361 *
362 * Note: If a GPE is shared by 2 silicon components, then both the drivers
363 * should support GPE polling mode or disabling the GPE for long period
364 * for one driver may break the other. So use it with care since all
365 * firmware _Lxx/_Exx handlers currently rely on the GPE interrupt mode.
366 *
367 ******************************************************************************/
368
369 ACPI_STATUS
370 AcpiSetGpe (
371 ACPI_HANDLE GpeDevice,
372 UINT32 GpeNumber,
373 UINT8 Action)
374 {
375 ACPI_GPE_EVENT_INFO *GpeEventInfo;
376 ACPI_STATUS Status;
377 ACPI_CPU_FLAGS Flags;
378
379
380 ACPI_FUNCTION_TRACE (AcpiSetGpe);
381
382
383 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
384
385 /* Ensure that we have a valid GPE number */
386
387 GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber);
388 if (!GpeEventInfo)
389 {
390 Status = AE_BAD_PARAMETER;
391 goto UnlockAndExit;
392 }
393
394 /* Perform the action */
395
396 switch (Action)
397 {
398 case ACPI_GPE_ENABLE:
399
400 Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_ENABLE);
401 GpeEventInfo->DisableForDispatch = FALSE;
402 break;
403
404 case ACPI_GPE_DISABLE:
405
406 Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_DISABLE);
407 GpeEventInfo->DisableForDispatch = TRUE;
408 break;
409
410 default:
411
412 Status = AE_BAD_PARAMETER;
413 break;
414 }
415
416 UnlockAndExit:
417 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
418 return_ACPI_STATUS (Status);
419 }
420
ACPI_EXPORT_SYMBOL(AcpiSetGpe)421 ACPI_EXPORT_SYMBOL (AcpiSetGpe)
422
423
424 /*******************************************************************************
425 *
426 * FUNCTION: AcpiMaskGpe
427 *
428 * PARAMETERS: GpeDevice - Parent GPE Device. NULL for GPE0/GPE1
429 * GpeNumber - GPE level within the GPE block
430 * IsMasked - Whether the GPE is masked or not
431 *
432 * RETURN: Status
433 *
434 * DESCRIPTION: Unconditionally mask/unmask the an individual GPE, ex., to
435 * prevent a GPE flooding.
436 *
437 ******************************************************************************/
438
439 ACPI_STATUS
440 AcpiMaskGpe (
441 ACPI_HANDLE GpeDevice,
442 UINT32 GpeNumber,
443 BOOLEAN IsMasked)
444 {
445 ACPI_GPE_EVENT_INFO *GpeEventInfo;
446 ACPI_STATUS Status;
447 ACPI_CPU_FLAGS Flags;
448
449
450 ACPI_FUNCTION_TRACE (AcpiMaskGpe);
451
452
453 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
454
455 /* Ensure that we have a valid GPE number */
456
457 GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber);
458 if (!GpeEventInfo)
459 {
460 Status = AE_BAD_PARAMETER;
461 goto UnlockAndExit;
462 }
463
464 Status = AcpiEvMaskGpe (GpeEventInfo, IsMasked);
465
466 UnlockAndExit:
467 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
468 return_ACPI_STATUS (Status);
469 }
470
ACPI_EXPORT_SYMBOL(AcpiMaskGpe)471 ACPI_EXPORT_SYMBOL (AcpiMaskGpe)
472
473
474 /*******************************************************************************
475 *
476 * FUNCTION: AcpiMarkGpeForWake
477 *
478 * PARAMETERS: GpeDevice - Parent GPE Device. NULL for GPE0/GPE1
479 * GpeNumber - GPE level within the GPE block
480 *
481 * RETURN: Status
482 *
483 * DESCRIPTION: Mark a GPE as having the ability to wake the system. Simply
484 * sets the ACPI_GPE_CAN_WAKE flag.
485 *
486 * Some potential callers of AcpiSetupGpeForWake may know in advance that
487 * there won't be any notify handlers installed for device wake notifications
488 * from the given GPE (one example is a button GPE in Linux). For these cases,
489 * AcpiMarkGpeForWake should be used instead of AcpiSetupGpeForWake.
490 * This will set the ACPI_GPE_CAN_WAKE flag for the GPE without trying to
491 * setup implicit wake notification for it (since there's no handler method).
492 *
493 ******************************************************************************/
494
495 ACPI_STATUS
496 AcpiMarkGpeForWake (
497 ACPI_HANDLE GpeDevice,
498 UINT32 GpeNumber)
499 {
500 ACPI_GPE_EVENT_INFO *GpeEventInfo;
501 ACPI_STATUS Status = AE_BAD_PARAMETER;
502 ACPI_CPU_FLAGS Flags;
503
504
505 ACPI_FUNCTION_TRACE (AcpiMarkGpeForWake);
506
507
508 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
509
510 /* Ensure that we have a valid GPE number */
511
512 GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber);
513 if (GpeEventInfo)
514 {
515 /* Mark the GPE as a possible wake event */
516
517 GpeEventInfo->Flags |= ACPI_GPE_CAN_WAKE;
518 Status = AE_OK;
519 }
520
521 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
522 return_ACPI_STATUS (Status);
523 }
524
ACPI_EXPORT_SYMBOL(AcpiMarkGpeForWake)525 ACPI_EXPORT_SYMBOL (AcpiMarkGpeForWake)
526
527
528 /*******************************************************************************
529 *
530 * FUNCTION: AcpiSetupGpeForWake
531 *
532 * PARAMETERS: WakeDevice - Device associated with the GPE (via _PRW)
533 * GpeDevice - Parent GPE Device. NULL for GPE0/GPE1
534 * GpeNumber - GPE level within the GPE block
535 *
536 * RETURN: Status
537 *
538 * DESCRIPTION: Mark a GPE as having the ability to wake the system. This
539 * interface is intended to be used as the host executes the
540 * _PRW methods (Power Resources for Wake) in the system tables.
541 * Each _PRW appears under a Device Object (The WakeDevice), and
542 * contains the info for the wake GPE associated with the
543 * WakeDevice.
544 *
545 ******************************************************************************/
546
547 ACPI_STATUS
548 AcpiSetupGpeForWake (
549 ACPI_HANDLE WakeDevice,
550 ACPI_HANDLE GpeDevice,
551 UINT32 GpeNumber)
552 {
553 ACPI_STATUS Status;
554 ACPI_GPE_EVENT_INFO *GpeEventInfo;
555 ACPI_NAMESPACE_NODE *DeviceNode;
556 ACPI_GPE_NOTIFY_INFO *Notify;
557 ACPI_GPE_NOTIFY_INFO *NewNotify;
558 ACPI_CPU_FLAGS Flags;
559
560
561 ACPI_FUNCTION_TRACE (AcpiSetupGpeForWake);
562
563
564 /* Parameter Validation */
565
566 if (!WakeDevice)
567 {
568 /*
569 * By forcing WakeDevice to be valid, we automatically enable the
570 * implicit notify feature on all hosts.
571 */
572 return_ACPI_STATUS (AE_BAD_PARAMETER);
573 }
574
575 /* Handle root object case */
576
577 if (WakeDevice == ACPI_ROOT_OBJECT)
578 {
579 DeviceNode = AcpiGbl_RootNode;
580 }
581 else
582 {
583 DeviceNode = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, WakeDevice);
584 }
585
586 /* Validate WakeDevice is of type Device */
587
588 if (DeviceNode->Type != ACPI_TYPE_DEVICE)
589 {
590 return_ACPI_STATUS (AE_BAD_PARAMETER);
591 }
592
593 /*
594 * Allocate a new notify object up front, in case it is needed.
595 * Memory allocation while holding a spinlock is a big no-no
596 * on some hosts.
597 */
598 NewNotify = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_GPE_NOTIFY_INFO));
599 if (!NewNotify)
600 {
601 return_ACPI_STATUS (AE_NO_MEMORY);
602 }
603
604 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
605
606 /* Ensure that we have a valid GPE number */
607
608 GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber);
609 if (!GpeEventInfo)
610 {
611 Status = AE_BAD_PARAMETER;
612 goto UnlockAndExit;
613 }
614
615 /*
616 * If there is no method or handler for this GPE, then the
617 * WakeDevice will be notified whenever this GPE fires. This is
618 * known as an "implicit notify". Note: The GPE is assumed to be
619 * level-triggered (for windows compatibility).
620 */
621 if (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags) ==
622 ACPI_GPE_DISPATCH_NONE)
623 {
624 /*
625 * This is the first device for implicit notify on this GPE.
626 * Just set the flags here, and enter the NOTIFY block below.
627 */
628 GpeEventInfo->Flags =
629 (ACPI_GPE_DISPATCH_NOTIFY | ACPI_GPE_LEVEL_TRIGGERED);
630 }
631 else if (GpeEventInfo->Flags & ACPI_GPE_AUTO_ENABLED)
632 {
633 /*
634 * A reference to this GPE has been added during the GPE block
635 * initialization, so drop it now to prevent the GPE from being
636 * permanently enabled and clear its ACPI_GPE_AUTO_ENABLED flag.
637 */
638 (void) AcpiEvRemoveGpeReference (GpeEventInfo);
639 GpeEventInfo->Flags &= ~~ACPI_GPE_AUTO_ENABLED;
640 }
641
642 /*
643 * If we already have an implicit notify on this GPE, add
644 * this device to the notify list.
645 */
646 if (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags) ==
647 ACPI_GPE_DISPATCH_NOTIFY)
648 {
649 /* Ensure that the device is not already in the list */
650
651 Notify = GpeEventInfo->Dispatch.NotifyList;
652 while (Notify)
653 {
654 if (Notify->DeviceNode == DeviceNode)
655 {
656 Status = AE_ALREADY_EXISTS;
657 goto UnlockAndExit;
658 }
659 Notify = Notify->Next;
660 }
661
662 /* Add this device to the notify list for this GPE */
663
664 NewNotify->DeviceNode = DeviceNode;
665 NewNotify->Next = GpeEventInfo->Dispatch.NotifyList;
666 GpeEventInfo->Dispatch.NotifyList = NewNotify;
667 NewNotify = NULL;
668 }
669
670 /* Mark the GPE as a possible wake event */
671
672 GpeEventInfo->Flags |= ACPI_GPE_CAN_WAKE;
673 Status = AE_OK;
674
675
676 UnlockAndExit:
677 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
678
679 /* Delete the notify object if it was not used above */
680
681 if (NewNotify)
682 {
683 ACPI_FREE (NewNotify);
684 }
685 return_ACPI_STATUS (Status);
686 }
687
ACPI_EXPORT_SYMBOL(AcpiSetupGpeForWake)688 ACPI_EXPORT_SYMBOL (AcpiSetupGpeForWake)
689
690
691 /*******************************************************************************
692 *
693 * FUNCTION: AcpiSetGpeWakeMask
694 *
695 * PARAMETERS: GpeDevice - Parent GPE Device. NULL for GPE0/GPE1
696 * GpeNumber - GPE level within the GPE block
697 * Action - Enable or Disable
698 *
699 * RETURN: Status
700 *
701 * DESCRIPTION: Set or clear the GPE's wakeup enable mask bit. The GPE must
702 * already be marked as a WAKE GPE.
703 *
704 ******************************************************************************/
705
706 ACPI_STATUS
707 AcpiSetGpeWakeMask (
708 ACPI_HANDLE GpeDevice,
709 UINT32 GpeNumber,
710 UINT8 Action)
711 {
712 ACPI_STATUS Status = AE_OK;
713 ACPI_GPE_EVENT_INFO *GpeEventInfo;
714 ACPI_GPE_REGISTER_INFO *GpeRegisterInfo;
715 ACPI_CPU_FLAGS Flags;
716 UINT32 RegisterBit;
717
718
719 ACPI_FUNCTION_TRACE (AcpiSetGpeWakeMask);
720
721
722 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
723
724 /*
725 * Ensure that we have a valid GPE number and that this GPE is in
726 * fact a wake GPE
727 */
728 GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber);
729 if (!GpeEventInfo)
730 {
731 Status = AE_BAD_PARAMETER;
732 goto UnlockAndExit;
733 }
734
735 if (!(GpeEventInfo->Flags & ACPI_GPE_CAN_WAKE))
736 {
737 Status = AE_TYPE;
738 goto UnlockAndExit;
739 }
740
741 GpeRegisterInfo = GpeEventInfo->RegisterInfo;
742 if (!GpeRegisterInfo)
743 {
744 Status = AE_NOT_EXIST;
745 goto UnlockAndExit;
746 }
747
748 RegisterBit = AcpiHwGetGpeRegisterBit (GpeEventInfo);
749
750 /* Perform the action */
751
752 switch (Action)
753 {
754 case ACPI_GPE_ENABLE:
755
756 ACPI_SET_BIT (GpeRegisterInfo->EnableForWake, (UINT8) RegisterBit);
757 break;
758
759 case ACPI_GPE_DISABLE:
760
761 ACPI_CLEAR_BIT (GpeRegisterInfo->EnableForWake, (UINT8) RegisterBit);
762 break;
763
764 default:
765
766 ACPI_ERROR ((AE_INFO, "%u, Invalid action", Action));
767 Status = AE_BAD_PARAMETER;
768 break;
769 }
770
771 UnlockAndExit:
772 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
773 return_ACPI_STATUS (Status);
774 }
775
ACPI_EXPORT_SYMBOL(AcpiSetGpeWakeMask)776 ACPI_EXPORT_SYMBOL (AcpiSetGpeWakeMask)
777
778
779 /*******************************************************************************
780 *
781 * FUNCTION: AcpiClearGpe
782 *
783 * PARAMETERS: GpeDevice - Parent GPE Device. NULL for GPE0/GPE1
784 * GpeNumber - GPE level within the GPE block
785 *
786 * RETURN: Status
787 *
788 * DESCRIPTION: Clear an ACPI event (general purpose)
789 *
790 ******************************************************************************/
791
792 ACPI_STATUS
793 AcpiClearGpe (
794 ACPI_HANDLE GpeDevice,
795 UINT32 GpeNumber)
796 {
797 ACPI_STATUS Status = AE_OK;
798 ACPI_GPE_EVENT_INFO *GpeEventInfo;
799 ACPI_CPU_FLAGS Flags;
800
801
802 ACPI_FUNCTION_TRACE (AcpiClearGpe);
803
804
805 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
806
807 /* Ensure that we have a valid GPE number */
808
809 GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber);
810 if (!GpeEventInfo)
811 {
812 Status = AE_BAD_PARAMETER;
813 goto UnlockAndExit;
814 }
815
816 Status = AcpiHwClearGpe (GpeEventInfo);
817
818 UnlockAndExit:
819 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
820 return_ACPI_STATUS (Status);
821 }
822
ACPI_EXPORT_SYMBOL(AcpiClearGpe)823 ACPI_EXPORT_SYMBOL (AcpiClearGpe)
824
825
826 /*******************************************************************************
827 *
828 * FUNCTION: AcpiGetGpeStatus
829 *
830 * PARAMETERS: GpeDevice - Parent GPE Device. NULL for GPE0/GPE1
831 * GpeNumber - GPE level within the GPE block
832 * EventStatus - Where the current status of the event
833 * will be returned
834 *
835 * RETURN: Status
836 *
837 * DESCRIPTION: Get the current status of a GPE (signalled/not_signalled)
838 *
839 ******************************************************************************/
840
841 ACPI_STATUS
842 AcpiGetGpeStatus (
843 ACPI_HANDLE GpeDevice,
844 UINT32 GpeNumber,
845 ACPI_EVENT_STATUS *EventStatus)
846 {
847 ACPI_STATUS Status = AE_OK;
848 ACPI_GPE_EVENT_INFO *GpeEventInfo;
849 ACPI_CPU_FLAGS Flags;
850
851
852 ACPI_FUNCTION_TRACE (AcpiGetGpeStatus);
853
854
855 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
856
857 /* Ensure that we have a valid GPE number */
858
859 GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber);
860 if (!GpeEventInfo)
861 {
862 Status = AE_BAD_PARAMETER;
863 goto UnlockAndExit;
864 }
865
866 /* Obtain status on the requested GPE number */
867
868 Status = AcpiHwGetGpeStatus (GpeEventInfo, EventStatus);
869
870 UnlockAndExit:
871 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
872 return_ACPI_STATUS (Status);
873 }
874
ACPI_EXPORT_SYMBOL(AcpiGetGpeStatus)875 ACPI_EXPORT_SYMBOL (AcpiGetGpeStatus)
876
877
878 /*******************************************************************************
879 *
880 * FUNCTION: AcpiDispatchGpe
881 *
882 * PARAMETERS: GpeDevice - Parent GPE Device. NULL for GPE0/GPE1
883 * GpeNumber - GPE level within the GPE block
884 *
885 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
886 *
887 * DESCRIPTION: Detect and dispatch a General Purpose Event to either a function
888 * (e.g. EC) or method (e.g. _Lxx/_Exx) handler.
889 *
890 ******************************************************************************/
891
892 UINT32
893 AcpiDispatchGpe(
894 ACPI_HANDLE GpeDevice,
895 UINT32 GpeNumber)
896 {
897 ACPI_FUNCTION_TRACE(acpi_dispatch_gpe);
898
899 return (AcpiEvDetectGpe (GpeDevice, NULL, GpeNumber));
900 }
901
ACPI_EXPORT_SYMBOL(AcpiDispatchGpe)902 ACPI_EXPORT_SYMBOL (AcpiDispatchGpe)
903
904
905 /*******************************************************************************
906 *
907 * FUNCTION: AcpiFinishGpe
908 *
909 * PARAMETERS: GpeDevice - Namespace node for the GPE Block
910 * (NULL for FADT defined GPEs)
911 * GpeNumber - GPE level within the GPE block
912 *
913 * RETURN: Status
914 *
915 * DESCRIPTION: Clear and conditionally re-enable a GPE. This completes the GPE
916 * processing. Intended for use by asynchronous host-installed
917 * GPE handlers. The GPE is only re-enabled if the EnableForRun bit
918 * is set in the GPE info.
919 *
920 ******************************************************************************/
921
922 ACPI_STATUS
923 AcpiFinishGpe (
924 ACPI_HANDLE GpeDevice,
925 UINT32 GpeNumber)
926 {
927 ACPI_GPE_EVENT_INFO *GpeEventInfo;
928 ACPI_STATUS Status;
929 ACPI_CPU_FLAGS Flags;
930
931
932 ACPI_FUNCTION_TRACE (AcpiFinishGpe);
933
934
935 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
936
937 /* Ensure that we have a valid GPE number */
938
939 GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber);
940 if (!GpeEventInfo)
941 {
942 Status = AE_BAD_PARAMETER;
943 goto UnlockAndExit;
944 }
945
946 Status = AcpiEvFinishGpe (GpeEventInfo);
947
948 UnlockAndExit:
949 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
950 return_ACPI_STATUS (Status);
951 }
952
ACPI_EXPORT_SYMBOL(AcpiFinishGpe)953 ACPI_EXPORT_SYMBOL (AcpiFinishGpe)
954
955
956 /******************************************************************************
957 *
958 * FUNCTION: AcpiDisableAllGpes
959 *
960 * PARAMETERS: None
961 *
962 * RETURN: Status
963 *
964 * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
965 *
966 ******************************************************************************/
967
968 ACPI_STATUS
969 AcpiDisableAllGpes (
970 void)
971 {
972 ACPI_STATUS Status;
973
974
975 ACPI_FUNCTION_TRACE (AcpiDisableAllGpes);
976
977
978 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
979 if (ACPI_FAILURE (Status))
980 {
981 return_ACPI_STATUS (Status);
982 }
983
984 Status = AcpiHwDisableAllGpes ();
985 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
986
987 return_ACPI_STATUS (Status);
988 }
989
ACPI_EXPORT_SYMBOL(AcpiDisableAllGpes)990 ACPI_EXPORT_SYMBOL (AcpiDisableAllGpes)
991
992
993 /******************************************************************************
994 *
995 * FUNCTION: AcpiEnableAllRuntimeGpes
996 *
997 * PARAMETERS: None
998 *
999 * RETURN: Status
1000 *
1001 * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
1002 *
1003 ******************************************************************************/
1004
1005 ACPI_STATUS
1006 AcpiEnableAllRuntimeGpes (
1007 void)
1008 {
1009 ACPI_STATUS Status;
1010
1011
1012 ACPI_FUNCTION_TRACE (AcpiEnableAllRuntimeGpes);
1013
1014
1015 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
1016 if (ACPI_FAILURE (Status))
1017 {
1018 return_ACPI_STATUS (Status);
1019 }
1020
1021 Status = AcpiHwEnableAllRuntimeGpes ();
1022 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
1023
1024 return_ACPI_STATUS (Status);
1025 }
1026
ACPI_EXPORT_SYMBOL(AcpiEnableAllRuntimeGpes)1027 ACPI_EXPORT_SYMBOL (AcpiEnableAllRuntimeGpes)
1028
1029
1030 /******************************************************************************
1031 *
1032 * FUNCTION: AcpiEnableAllWakeupGpes
1033 *
1034 * PARAMETERS: None
1035 *
1036 * RETURN: Status
1037 *
1038 * DESCRIPTION: Enable all "wakeup" GPEs and disable all of the other GPEs, in
1039 * all GPE blocks.
1040 *
1041 ******************************************************************************/
1042
1043 ACPI_STATUS
1044 AcpiEnableAllWakeupGpes (
1045 void)
1046 {
1047 ACPI_STATUS Status;
1048
1049
1050 ACPI_FUNCTION_TRACE (AcpiEnableAllWakeupGpes);
1051
1052
1053 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
1054 if (ACPI_FAILURE (Status))
1055 {
1056 return_ACPI_STATUS (Status);
1057 }
1058
1059 Status = AcpiHwEnableAllWakeupGpes ();
1060 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
1061
1062 return_ACPI_STATUS (Status);
1063 }
1064
ACPI_EXPORT_SYMBOL(AcpiEnableAllWakeupGpes)1065 ACPI_EXPORT_SYMBOL (AcpiEnableAllWakeupGpes)
1066
1067
1068 /******************************************************************************
1069 *
1070 * FUNCTION: AcpiAnyGpeStatusSet
1071 *
1072 * PARAMETERS: None
1073 *
1074 * RETURN: Whether or not the status bit is set for any GPE
1075 *
1076 * DESCRIPTION: Check the status bits of all enabled GPEs and return TRUE if any
1077 * of them is set or FALSE otherwise.
1078 *
1079 ******************************************************************************/
1080
1081 UINT32
1082 AcpiAnyGpeStatusSet (
1083 void)
1084 {
1085 ACPI_STATUS Status;
1086 UINT8 Ret;
1087
1088
1089 ACPI_FUNCTION_TRACE (AcpiAnyGpeStatusSet);
1090
1091 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
1092 if (ACPI_FAILURE (Status))
1093 {
1094 return (FALSE);
1095 }
1096
1097 Ret = AcpiHwCheckAllGpes ();
1098 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
1099
1100 return (Ret);
1101 }
1102
ACPI_EXPORT_SYMBOL(AcpiAnyGpeStatusSet)1103 ACPI_EXPORT_SYMBOL(AcpiAnyGpeStatusSet)
1104
1105
1106 /*******************************************************************************
1107 *
1108 * FUNCTION: AcpiInstallGpeBlock
1109 *
1110 * PARAMETERS: GpeDevice - Handle to the parent GPE Block Device
1111 * GpeBlockAddress - Address and SpaceID
1112 * RegisterCount - Number of GPE register pairs in the block
1113 * InterruptNumber - H/W interrupt for the block
1114 *
1115 * RETURN: Status
1116 *
1117 * DESCRIPTION: Create and Install a block of GPE registers. The GPEs are not
1118 * enabled here.
1119 *
1120 ******************************************************************************/
1121
1122 ACPI_STATUS
1123 AcpiInstallGpeBlock (
1124 ACPI_HANDLE GpeDevice,
1125 ACPI_GENERIC_ADDRESS *GpeBlockAddress,
1126 UINT32 RegisterCount,
1127 UINT32 InterruptNumber)
1128 {
1129 ACPI_STATUS Status;
1130 ACPI_OPERAND_OBJECT *ObjDesc;
1131 ACPI_NAMESPACE_NODE *Node;
1132 ACPI_GPE_BLOCK_INFO *GpeBlock;
1133
1134
1135 ACPI_FUNCTION_TRACE (AcpiInstallGpeBlock);
1136
1137
1138 if ((!GpeDevice) ||
1139 (!GpeBlockAddress) ||
1140 (!RegisterCount))
1141 {
1142 return_ACPI_STATUS (AE_BAD_PARAMETER);
1143 }
1144
1145 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
1146 if (ACPI_FAILURE (Status))
1147 {
1148 return_ACPI_STATUS (Status);
1149 }
1150
1151 Node = AcpiNsValidateHandle (GpeDevice);
1152 if (!Node)
1153 {
1154 Status = AE_BAD_PARAMETER;
1155 goto UnlockAndExit;
1156 }
1157
1158 /* Validate the parent device */
1159
1160 if (Node->Type != ACPI_TYPE_DEVICE)
1161 {
1162 Status = AE_TYPE;
1163 goto UnlockAndExit;
1164 }
1165
1166 if (Node->Object)
1167 {
1168 Status = AE_ALREADY_EXISTS;
1169 goto UnlockAndExit;
1170 }
1171
1172 /*
1173 * For user-installed GPE Block Devices, the GpeBlockBaseNumber
1174 * is always zero
1175 */
1176 Status = AcpiEvCreateGpeBlock (Node, GpeBlockAddress->Address,
1177 GpeBlockAddress->SpaceId, RegisterCount,
1178 0, InterruptNumber, &GpeBlock);
1179 if (ACPI_FAILURE (Status))
1180 {
1181 goto UnlockAndExit;
1182 }
1183
1184 /* Install block in the DeviceObject attached to the node */
1185
1186 ObjDesc = AcpiNsGetAttachedObject (Node);
1187 if (!ObjDesc)
1188 {
1189 /*
1190 * No object, create a new one (Device nodes do not always have
1191 * an attached object)
1192 */
1193 ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_DEVICE);
1194 if (!ObjDesc)
1195 {
1196 Status = AE_NO_MEMORY;
1197 goto UnlockAndExit;
1198 }
1199
1200 Status = AcpiNsAttachObject (Node, ObjDesc, ACPI_TYPE_DEVICE);
1201
1202 /* Remove local reference to the object */
1203
1204 AcpiUtRemoveReference (ObjDesc);
1205 if (ACPI_FAILURE (Status))
1206 {
1207 goto UnlockAndExit;
1208 }
1209 }
1210
1211 /* Now install the GPE block in the DeviceObject */
1212
1213 ObjDesc->Device.GpeBlock = GpeBlock;
1214
1215
1216 UnlockAndExit:
1217 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
1218 return_ACPI_STATUS (Status);
1219 }
1220
ACPI_EXPORT_SYMBOL(AcpiInstallGpeBlock)1221 ACPI_EXPORT_SYMBOL (AcpiInstallGpeBlock)
1222
1223
1224 /*******************************************************************************
1225 *
1226 * FUNCTION: AcpiRemoveGpeBlock
1227 *
1228 * PARAMETERS: GpeDevice - Handle to the parent GPE Block Device
1229 *
1230 * RETURN: Status
1231 *
1232 * DESCRIPTION: Remove a previously installed block of GPE registers
1233 *
1234 ******************************************************************************/
1235
1236 ACPI_STATUS
1237 AcpiRemoveGpeBlock (
1238 ACPI_HANDLE GpeDevice)
1239 {
1240 ACPI_OPERAND_OBJECT *ObjDesc;
1241 ACPI_STATUS Status;
1242 ACPI_NAMESPACE_NODE *Node;
1243
1244
1245 ACPI_FUNCTION_TRACE (AcpiRemoveGpeBlock);
1246
1247
1248 if (!GpeDevice)
1249 {
1250 return_ACPI_STATUS (AE_BAD_PARAMETER);
1251 }
1252
1253 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
1254 if (ACPI_FAILURE (Status))
1255 {
1256 return_ACPI_STATUS (Status);
1257 }
1258
1259 Node = AcpiNsValidateHandle (GpeDevice);
1260 if (!Node)
1261 {
1262 Status = AE_BAD_PARAMETER;
1263 goto UnlockAndExit;
1264 }
1265
1266 /* Validate the parent device */
1267
1268 if (Node->Type != ACPI_TYPE_DEVICE)
1269 {
1270 Status = AE_TYPE;
1271 goto UnlockAndExit;
1272 }
1273
1274 /* Get the DeviceObject attached to the node */
1275
1276 ObjDesc = AcpiNsGetAttachedObject (Node);
1277 if (!ObjDesc ||
1278 !ObjDesc->Device.GpeBlock)
1279 {
1280 return_ACPI_STATUS (AE_NULL_OBJECT);
1281 }
1282
1283 /* Delete the GPE block (but not the DeviceObject) */
1284
1285 Status = AcpiEvDeleteGpeBlock (ObjDesc->Device.GpeBlock);
1286 if (ACPI_SUCCESS (Status))
1287 {
1288 ObjDesc->Device.GpeBlock = NULL;
1289 }
1290
1291 UnlockAndExit:
1292 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
1293 return_ACPI_STATUS (Status);
1294 }
1295
ACPI_EXPORT_SYMBOL(AcpiRemoveGpeBlock)1296 ACPI_EXPORT_SYMBOL (AcpiRemoveGpeBlock)
1297
1298
1299 /*******************************************************************************
1300 *
1301 * FUNCTION: AcpiGetGpeDevice
1302 *
1303 * PARAMETERS: Index - System GPE index (0-CurrentGpeCount)
1304 * GpeDevice - Where the parent GPE Device is returned
1305 *
1306 * RETURN: Status
1307 *
1308 * DESCRIPTION: Obtain the GPE device associated with the input index. A NULL
1309 * gpe device indicates that the gpe number is contained in one of
1310 * the FADT-defined gpe blocks. Otherwise, the GPE block device.
1311 *
1312 ******************************************************************************/
1313
1314 ACPI_STATUS
1315 AcpiGetGpeDevice (
1316 UINT32 Index,
1317 ACPI_HANDLE *GpeDevice)
1318 {
1319 ACPI_GPE_DEVICE_INFO Info;
1320 ACPI_STATUS Status;
1321
1322
1323 ACPI_FUNCTION_TRACE (AcpiGetGpeDevice);
1324
1325
1326 if (!GpeDevice)
1327 {
1328 return_ACPI_STATUS (AE_BAD_PARAMETER);
1329 }
1330
1331 if (Index >= AcpiCurrentGpeCount)
1332 {
1333 return_ACPI_STATUS (AE_NOT_EXIST);
1334 }
1335
1336 /* Setup and walk the GPE list */
1337
1338 Info.Index = Index;
1339 Info.Status = AE_NOT_EXIST;
1340 Info.GpeDevice = NULL;
1341 Info.NextBlockBaseIndex = 0;
1342
1343 Status = AcpiEvWalkGpeList (AcpiEvGetGpeDevice, &Info);
1344 if (ACPI_FAILURE (Status))
1345 {
1346 return_ACPI_STATUS (Status);
1347 }
1348
1349 *GpeDevice = ACPI_CAST_PTR (ACPI_HANDLE, Info.GpeDevice);
1350 return_ACPI_STATUS (Info.Status);
1351 }
1352
1353 ACPI_EXPORT_SYMBOL (AcpiGetGpeDevice)
1354
1355 #endif /* !ACPI_REDUCED_HARDWARE */
1356
