Merge branch 'asus-eeepc' into release
[linux-2.6] / drivers / acpi / acpica / evgpe.c
1 /******************************************************************************
2  *
3  * Module Name: evgpe - General Purpose Event handling and dispatch
4  *
5  *****************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2008, 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/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 /* Local prototypes */
53 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context);
54
55 /*******************************************************************************
56  *
57  * FUNCTION:    acpi_ev_set_gpe_type
58  *
59  * PARAMETERS:  gpe_event_info          - GPE to set
60  *              Type                    - New type
61  *
62  * RETURN:      Status
63  *
64  * DESCRIPTION: Sets the new type for the GPE (wake, run, or wake/run)
65  *
66  ******************************************************************************/
67
68 acpi_status
69 acpi_ev_set_gpe_type(struct acpi_gpe_event_info *gpe_event_info, u8 type)
70 {
71         acpi_status status;
72
73         ACPI_FUNCTION_TRACE(ev_set_gpe_type);
74
75         /* Validate type and update register enable masks */
76
77         switch (type) {
78         case ACPI_GPE_TYPE_WAKE:
79         case ACPI_GPE_TYPE_RUNTIME:
80         case ACPI_GPE_TYPE_WAKE_RUN:
81                 break;
82
83         default:
84                 return_ACPI_STATUS(AE_BAD_PARAMETER);
85         }
86
87         /* Disable the GPE if currently enabled */
88
89         status = acpi_ev_disable_gpe(gpe_event_info);
90
91         /* Type was validated above */
92
93         gpe_event_info->flags &= ~ACPI_GPE_TYPE_MASK;   /* Clear type bits */
94         gpe_event_info->flags |= type;  /* Insert type */
95         return_ACPI_STATUS(status);
96 }
97
98 /*******************************************************************************
99  *
100  * FUNCTION:    acpi_ev_update_gpe_enable_masks
101  *
102  * PARAMETERS:  gpe_event_info          - GPE to update
103  *              Type                    - What to do: ACPI_GPE_DISABLE or
104  *                                        ACPI_GPE_ENABLE
105  *
106  * RETURN:      Status
107  *
108  * DESCRIPTION: Updates GPE register enable masks based on the GPE type
109  *
110  ******************************************************************************/
111
112 acpi_status
113 acpi_ev_update_gpe_enable_masks(struct acpi_gpe_event_info *gpe_event_info,
114                                 u8 type)
115 {
116         struct acpi_gpe_register_info *gpe_register_info;
117         u8 register_bit;
118
119         ACPI_FUNCTION_TRACE(ev_update_gpe_enable_masks);
120
121         gpe_register_info = gpe_event_info->register_info;
122         if (!gpe_register_info) {
123                 return_ACPI_STATUS(AE_NOT_EXIST);
124         }
125         register_bit = (u8)
126             (1 <<
127              (gpe_event_info->gpe_number - gpe_register_info->base_gpe_number));
128
129         /* 1) Disable case. Simply clear all enable bits */
130
131         if (type == ACPI_GPE_DISABLE) {
132                 ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake,
133                                register_bit);
134                 ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);
135                 return_ACPI_STATUS(AE_OK);
136         }
137
138         /* 2) Enable case. Set/Clear the appropriate enable bits */
139
140         switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
141         case ACPI_GPE_TYPE_WAKE:
142                 ACPI_SET_BIT(gpe_register_info->enable_for_wake, register_bit);
143                 ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);
144                 break;
145
146         case ACPI_GPE_TYPE_RUNTIME:
147                 ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake,
148                                register_bit);
149                 ACPI_SET_BIT(gpe_register_info->enable_for_run, register_bit);
150                 break;
151
152         case ACPI_GPE_TYPE_WAKE_RUN:
153                 ACPI_SET_BIT(gpe_register_info->enable_for_wake, register_bit);
154                 ACPI_SET_BIT(gpe_register_info->enable_for_run, register_bit);
155                 break;
156
157         default:
158                 return_ACPI_STATUS(AE_BAD_PARAMETER);
159         }
160
161         return_ACPI_STATUS(AE_OK);
162 }
163
164 /*******************************************************************************
165  *
166  * FUNCTION:    acpi_ev_enable_gpe
167  *
168  * PARAMETERS:  gpe_event_info          - GPE to enable
169  *              write_to_hardware       - Enable now, or just mark data structs
170  *                                        (WAKE GPEs should be deferred)
171  *
172  * RETURN:      Status
173  *
174  * DESCRIPTION: Enable a GPE based on the GPE type
175  *
176  ******************************************************************************/
177
178 acpi_status
179 acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info,
180                    u8 write_to_hardware)
181 {
182         acpi_status status;
183
184         ACPI_FUNCTION_TRACE(ev_enable_gpe);
185
186         /* Make sure HW enable masks are updated */
187
188         status =
189             acpi_ev_update_gpe_enable_masks(gpe_event_info, ACPI_GPE_ENABLE);
190         if (ACPI_FAILURE(status)) {
191                 return_ACPI_STATUS(status);
192         }
193
194         /* Mark wake-enabled or HW enable, or both */
195
196         switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
197         case ACPI_GPE_TYPE_WAKE:
198
199                 ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
200                 break;
201
202         case ACPI_GPE_TYPE_WAKE_RUN:
203
204                 ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
205
206                 /*lint -fallthrough */
207
208         case ACPI_GPE_TYPE_RUNTIME:
209
210                 ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_RUN_ENABLED);
211
212                 if (write_to_hardware) {
213
214                         /* Clear the GPE (of stale events), then enable it */
215
216                         status = acpi_hw_clear_gpe(gpe_event_info);
217                         if (ACPI_FAILURE(status)) {
218                                 return_ACPI_STATUS(status);
219                         }
220
221                         /* Enable the requested runtime GPE */
222
223                         status = acpi_hw_write_gpe_enable_reg(gpe_event_info);
224                 }
225                 break;
226
227         default:
228                 return_ACPI_STATUS(AE_BAD_PARAMETER);
229         }
230
231         return_ACPI_STATUS(AE_OK);
232 }
233
234 /*******************************************************************************
235  *
236  * FUNCTION:    acpi_ev_disable_gpe
237  *
238  * PARAMETERS:  gpe_event_info          - GPE to disable
239  *
240  * RETURN:      Status
241  *
242  * DESCRIPTION: Disable a GPE based on the GPE type
243  *
244  ******************************************************************************/
245
246 acpi_status acpi_ev_disable_gpe(struct acpi_gpe_event_info *gpe_event_info)
247 {
248         acpi_status status;
249
250         ACPI_FUNCTION_TRACE(ev_disable_gpe);
251
252         /* Make sure HW enable masks are updated */
253
254         status =
255             acpi_ev_update_gpe_enable_masks(gpe_event_info, ACPI_GPE_DISABLE);
256         if (ACPI_FAILURE(status)) {
257                 return_ACPI_STATUS(status);
258         }
259
260         /* Clear the appropriate enabled flags for this GPE */
261
262         switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
263         case ACPI_GPE_TYPE_WAKE:
264                 ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
265                 break;
266
267         case ACPI_GPE_TYPE_WAKE_RUN:
268                 ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
269
270                 /* fallthrough */
271
272         case ACPI_GPE_TYPE_RUNTIME:
273
274                 /* Disable the requested runtime GPE */
275
276                 ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_RUN_ENABLED);
277                 break;
278
279         default:
280                 break;
281         }
282
283         /*
284          * Even if we don't know the GPE type, make sure that we always
285          * disable it. low_disable_gpe will just clear the enable bit for this
286          * GPE and write it. It will not write out the current GPE enable mask,
287          * since this may inadvertently enable GPEs too early, if a rogue GPE has
288          * come in during ACPICA initialization - possibly as a result of AML or
289          * other code that has enabled the GPE.
290          */
291         status = acpi_hw_low_disable_gpe(gpe_event_info);
292         return_ACPI_STATUS(status);
293 }
294
295 /*******************************************************************************
296  *
297  * FUNCTION:    acpi_ev_get_gpe_event_info
298  *
299  * PARAMETERS:  gpe_device          - Device node. NULL for GPE0/GPE1
300  *              gpe_number          - Raw GPE number
301  *
302  * RETURN:      A GPE event_info struct. NULL if not a valid GPE
303  *
304  * DESCRIPTION: Returns the event_info struct associated with this GPE.
305  *              Validates the gpe_block and the gpe_number
306  *
307  *              Should be called only when the GPE lists are semaphore locked
308  *              and not subject to change.
309  *
310  ******************************************************************************/
311
312 struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device,
313                                                        u32 gpe_number)
314 {
315         union acpi_operand_object *obj_desc;
316         struct acpi_gpe_block_info *gpe_block;
317         u32 i;
318
319         ACPI_FUNCTION_ENTRY();
320
321         /* A NULL gpe_block means use the FADT-defined GPE block(s) */
322
323         if (!gpe_device) {
324
325                 /* Examine GPE Block 0 and 1 (These blocks are permanent) */
326
327                 for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) {
328                         gpe_block = acpi_gbl_gpe_fadt_blocks[i];
329                         if (gpe_block) {
330                                 if ((gpe_number >= gpe_block->block_base_number)
331                                     && (gpe_number <
332                                         gpe_block->block_base_number +
333                                         (gpe_block->register_count * 8))) {
334                                         return (&gpe_block->
335                                                 event_info[gpe_number -
336                                                            gpe_block->
337                                                            block_base_number]);
338                                 }
339                         }
340                 }
341
342                 /* The gpe_number was not in the range of either FADT GPE block */
343
344                 return (NULL);
345         }
346
347         /* A Non-NULL gpe_device means this is a GPE Block Device */
348
349         obj_desc = acpi_ns_get_attached_object((struct acpi_namespace_node *)
350                                                gpe_device);
351         if (!obj_desc || !obj_desc->device.gpe_block) {
352                 return (NULL);
353         }
354
355         gpe_block = obj_desc->device.gpe_block;
356
357         if ((gpe_number >= gpe_block->block_base_number) &&
358             (gpe_number <
359              gpe_block->block_base_number + (gpe_block->register_count * 8))) {
360                 return (&gpe_block->
361                         event_info[gpe_number - gpe_block->block_base_number]);
362         }
363
364         return (NULL);
365 }
366
367 /*******************************************************************************
368  *
369  * FUNCTION:    acpi_ev_gpe_detect
370  *
371  * PARAMETERS:  gpe_xrupt_list      - Interrupt block for this interrupt.
372  *                                    Can have multiple GPE blocks attached.
373  *
374  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
375  *
376  * DESCRIPTION: Detect if any GP events have occurred. This function is
377  *              executed at interrupt level.
378  *
379  ******************************************************************************/
380
381 u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)
382 {
383         acpi_status status;
384         struct acpi_gpe_block_info *gpe_block;
385         struct acpi_gpe_register_info *gpe_register_info;
386         u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
387         u8 enabled_status_byte;
388         u32 status_reg;
389         u32 enable_reg;
390         acpi_cpu_flags flags;
391         u32 i;
392         u32 j;
393
394         ACPI_FUNCTION_NAME(ev_gpe_detect);
395
396         /* Check for the case where there are no GPEs */
397
398         if (!gpe_xrupt_list) {
399                 return (int_status);
400         }
401
402         /*
403          * We need to obtain the GPE lock for both the data structs and registers
404          * Note: Not necessary to obtain the hardware lock, since the GPE
405          * registers are owned by the gpe_lock.
406          */
407         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
408
409         /* Examine all GPE blocks attached to this interrupt level */
410
411         gpe_block = gpe_xrupt_list->gpe_block_list_head;
412         while (gpe_block) {
413                 /*
414                  * Read all of the 8-bit GPE status and enable registers in this GPE
415                  * block, saving all of them. Find all currently active GP events.
416                  */
417                 for (i = 0; i < gpe_block->register_count; i++) {
418
419                         /* Get the next status/enable pair */
420
421                         gpe_register_info = &gpe_block->register_info[i];
422
423                         /* Read the Status Register */
424
425                         status =
426                             acpi_read(&status_reg,
427                                       &gpe_register_info->status_address);
428                         if (ACPI_FAILURE(status)) {
429                                 goto unlock_and_exit;
430                         }
431
432                         /* Read the Enable Register */
433
434                         status =
435                             acpi_read(&enable_reg,
436                                       &gpe_register_info->enable_address);
437                         if (ACPI_FAILURE(status)) {
438                                 goto unlock_and_exit;
439                         }
440
441                         ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
442                                           "Read GPE Register at GPE%X: Status=%02X, Enable=%02X\n",
443                                           gpe_register_info->base_gpe_number,
444                                           status_reg, enable_reg));
445
446                         /* Check if there is anything active at all in this register */
447
448                         enabled_status_byte = (u8) (status_reg & enable_reg);
449                         if (!enabled_status_byte) {
450
451                                 /* No active GPEs in this register, move on */
452
453                                 continue;
454                         }
455
456                         /* Now look at the individual GPEs in this byte register */
457
458                         for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
459
460                                 /* Examine one GPE bit */
461
462                                 if (enabled_status_byte & (1 << j)) {
463                                         /*
464                                          * Found an active GPE. Dispatch the event to a handler
465                                          * or method.
466                                          */
467                                         int_status |=
468                                             acpi_ev_gpe_dispatch(&gpe_block->
469                                                 event_info[((acpi_size) i * ACPI_GPE_REGISTER_WIDTH) + j], j + gpe_register_info->base_gpe_number);
470                                 }
471                         }
472                 }
473
474                 gpe_block = gpe_block->next;
475         }
476
477       unlock_and_exit:
478
479         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
480         return (int_status);
481 }
482
483 /*******************************************************************************
484  *
485  * FUNCTION:    acpi_ev_asynch_execute_gpe_method
486  *
487  * PARAMETERS:  Context (gpe_event_info) - Info for this GPE
488  *
489  * RETURN:      None
490  *
491  * DESCRIPTION: Perform the actual execution of a GPE control method. This
492  *              function is called from an invocation of acpi_os_execute and
493  *              therefore does NOT execute at interrupt level - so that
494  *              the control method itself is not executed in the context of
495  *              an interrupt handler.
496  *
497  ******************************************************************************/
498 static void acpi_ev_asynch_enable_gpe(void *context);
499
500 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context)
501 {
502         struct acpi_gpe_event_info *gpe_event_info = (void *)context;
503         acpi_status status;
504         struct acpi_gpe_event_info local_gpe_event_info;
505         struct acpi_evaluate_info *info;
506
507         ACPI_FUNCTION_TRACE(ev_asynch_execute_gpe_method);
508
509         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
510         if (ACPI_FAILURE(status)) {
511                 return_VOID;
512         }
513
514         /* Must revalidate the gpe_number/gpe_block */
515
516         if (!acpi_ev_valid_gpe_event(gpe_event_info)) {
517                 status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
518                 return_VOID;
519         }
520
521         /* Set the GPE flags for return to enabled state */
522
523         (void)acpi_ev_enable_gpe(gpe_event_info, FALSE);
524
525         /*
526          * Take a snapshot of the GPE info for this level - we copy the info to
527          * prevent a race condition with remove_handler/remove_block.
528          */
529         ACPI_MEMCPY(&local_gpe_event_info, gpe_event_info,
530                     sizeof(struct acpi_gpe_event_info));
531
532         status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
533         if (ACPI_FAILURE(status)) {
534                 return_VOID;
535         }
536
537         /*
538          * Must check for control method type dispatch one more time to avoid a
539          * race with ev_gpe_install_handler
540          */
541         if ((local_gpe_event_info.flags & ACPI_GPE_DISPATCH_MASK) ==
542             ACPI_GPE_DISPATCH_METHOD) {
543
544                 /* Allocate the evaluation information block */
545
546                 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
547                 if (!info) {
548                         status = AE_NO_MEMORY;
549                 } else {
550                         /*
551                          * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the _Lxx/_Exx
552                          * control method that corresponds to this GPE
553                          */
554                         info->prefix_node =
555                             local_gpe_event_info.dispatch.method_node;
556                         info->flags = ACPI_IGNORE_RETURN_VALUE;
557
558                         status = acpi_ns_evaluate(info);
559                         ACPI_FREE(info);
560                 }
561
562                 if (ACPI_FAILURE(status)) {
563                         ACPI_EXCEPTION((AE_INFO, status,
564                                         "while evaluating GPE method [%4.4s]",
565                                         acpi_ut_get_node_name
566                                         (local_gpe_event_info.dispatch.
567                                          method_node)));
568                 }
569         }
570         /* Defer enabling of GPE until all notify handlers are done */
571         acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_ev_asynch_enable_gpe,
572                                 gpe_event_info);
573         return_VOID;
574 }
575
576 static void acpi_ev_asynch_enable_gpe(void *context)
577 {
578         struct acpi_gpe_event_info *gpe_event_info = context;
579         acpi_status status;
580         if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
581             ACPI_GPE_LEVEL_TRIGGERED) {
582                 /*
583                  * GPE is level-triggered, we clear the GPE status bit after handling
584                  * the event.
585                  */
586                 status = acpi_hw_clear_gpe(gpe_event_info);
587                 if (ACPI_FAILURE(status)) {
588                         return_VOID;
589                 }
590         }
591
592         /* Enable this GPE */
593         (void)acpi_hw_write_gpe_enable_reg(gpe_event_info);
594         return_VOID;
595 }
596
597 /*******************************************************************************
598  *
599  * FUNCTION:    acpi_ev_gpe_dispatch
600  *
601  * PARAMETERS:  gpe_event_info  - Info for this GPE
602  *              gpe_number      - Number relative to the parent GPE block
603  *
604  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
605  *
606  * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
607  *              or method (e.g. _Lxx/_Exx) handler.
608  *
609  *              This function executes at interrupt level.
610  *
611  ******************************************************************************/
612
613 u32
614 acpi_ev_gpe_dispatch(struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)
615 {
616         acpi_status status;
617
618         ACPI_FUNCTION_TRACE(ev_gpe_dispatch);
619
620         acpi_os_gpe_count(gpe_number);
621
622         /*
623          * If edge-triggered, clear the GPE status bit now. Note that
624          * level-triggered events are cleared after the GPE is serviced.
625          */
626         if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
627             ACPI_GPE_EDGE_TRIGGERED) {
628                 status = acpi_hw_clear_gpe(gpe_event_info);
629                 if (ACPI_FAILURE(status)) {
630                         ACPI_EXCEPTION((AE_INFO, status,
631                                         "Unable to clear GPE[%2X]",
632                                         gpe_number));
633                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
634                 }
635         }
636
637         /*
638          * Dispatch the GPE to either an installed handler, or the control method
639          * associated with this GPE (_Lxx or _Exx). If a handler exists, we invoke
640          * it and do not attempt to run the method. If there is neither a handler
641          * nor a method, we disable this GPE to prevent further such pointless
642          * events from firing.
643          */
644         switch (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) {
645         case ACPI_GPE_DISPATCH_HANDLER:
646
647                 /*
648                  * Invoke the installed handler (at interrupt level)
649                  * Ignore return status for now.
650                  * TBD: leave GPE disabled on error?
651                  */
652                 (void)gpe_event_info->dispatch.handler->address(gpe_event_info->
653                                                                 dispatch.
654                                                                 handler->
655                                                                 context);
656
657                 /* It is now safe to clear level-triggered events. */
658
659                 if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
660                     ACPI_GPE_LEVEL_TRIGGERED) {
661                         status = acpi_hw_clear_gpe(gpe_event_info);
662                         if (ACPI_FAILURE(status)) {
663                                 ACPI_EXCEPTION((AE_INFO, status,
664                                                 "Unable to clear GPE[%2X]",
665                                                 gpe_number));
666                                 return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
667                         }
668                 }
669                 break;
670
671         case ACPI_GPE_DISPATCH_METHOD:
672
673                 /*
674                  * Disable the GPE, so it doesn't keep firing before the method has a
675                  * chance to run (it runs asynchronously with interrupts enabled).
676                  */
677                 status = acpi_ev_disable_gpe(gpe_event_info);
678                 if (ACPI_FAILURE(status)) {
679                         ACPI_EXCEPTION((AE_INFO, status,
680                                         "Unable to disable GPE[%2X]",
681                                         gpe_number));
682                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
683                 }
684
685                 /*
686                  * Execute the method associated with the GPE
687                  * NOTE: Level-triggered GPEs are cleared after the method completes.
688                  */
689                 status = acpi_os_execute(OSL_GPE_HANDLER,
690                                          acpi_ev_asynch_execute_gpe_method,
691                                          gpe_event_info);
692                 if (ACPI_FAILURE(status)) {
693                         ACPI_EXCEPTION((AE_INFO, status,
694                                         "Unable to queue handler for GPE[%2X] - event disabled",
695                                         gpe_number));
696                 }
697                 break;
698
699         default:
700
701                 /* No handler or method to run! */
702
703                 ACPI_ERROR((AE_INFO,
704                             "No handler or method for GPE[%2X], disabling event",
705                             gpe_number));
706
707                 /*
708                  * Disable the GPE. The GPE will remain disabled until the ACPICA
709                  * Core Subsystem is restarted, or a handler is installed.
710                  */
711                 status = acpi_ev_disable_gpe(gpe_event_info);
712                 if (ACPI_FAILURE(status)) {
713                         ACPI_EXCEPTION((AE_INFO, status,
714                                         "Unable to disable GPE[%2X]",
715                                         gpe_number));
716                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
717                 }
718                 break;
719         }
720
721         return_UINT32(ACPI_INTERRUPT_HANDLED);
722 }