23fe53ba73758bf77c304699c824a238d2e4471c
[sfrench/cifs-2.6.git] / drivers / acpi / events / evgpe.c
1 /******************************************************************************
2  *
3  * Module Name: evgpe - General Purpose Event handling and dispatch
4  *
5  *****************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2006, R. Byron Moore
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 <acpi/acevents.h>
46 #include <acpi/acnamesp.h>
47
48 #define _COMPONENT          ACPI_EVENTS
49 ACPI_MODULE_NAME("evgpe")
50
51 /* Local prototypes */
52 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context);
53
54 /*******************************************************************************
55  *
56  * FUNCTION:    acpi_ev_set_gpe_type
57  *
58  * PARAMETERS:  gpe_event_info          - GPE to set
59  *              Type                    - New type
60  *
61  * RETURN:      Status
62  *
63  * DESCRIPTION: Sets the new type for the GPE (wake, run, or wake/run)
64  *
65  ******************************************************************************/
66
67 acpi_status
68 acpi_ev_set_gpe_type(struct acpi_gpe_event_info *gpe_event_info, u8 type)
69 {
70         acpi_status status;
71
72         ACPI_FUNCTION_TRACE(ev_set_gpe_type);
73
74         /* Validate type and update register enable masks */
75
76         switch (type) {
77         case ACPI_GPE_TYPE_WAKE:
78         case ACPI_GPE_TYPE_RUNTIME:
79         case ACPI_GPE_TYPE_WAKE_RUN:
80                 break;
81
82         default:
83                 return_ACPI_STATUS(AE_BAD_PARAMETER);
84         }
85
86         /* Disable the GPE if currently enabled */
87
88         status = acpi_ev_disable_gpe(gpe_event_info);
89
90         /* Type was validated above */
91
92         gpe_event_info->flags &= ~ACPI_GPE_TYPE_MASK;   /* Clear type bits */
93         gpe_event_info->flags |= type;  /* Insert type */
94         return_ACPI_STATUS(status);
95 }
96
97 /*******************************************************************************
98  *
99  * FUNCTION:    acpi_ev_update_gpe_enable_masks
100  *
101  * PARAMETERS:  gpe_event_info          - GPE to update
102  *              Type                    - What to do: ACPI_GPE_DISABLE or
103  *                                        ACPI_GPE_ENABLE
104  *
105  * RETURN:      Status
106  *
107  * DESCRIPTION: Updates GPE register enable masks based on the GPE type
108  *
109  ******************************************************************************/
110
111 acpi_status
112 acpi_ev_update_gpe_enable_masks(struct acpi_gpe_event_info *gpe_event_info,
113                                 u8 type)
114 {
115         struct acpi_gpe_register_info *gpe_register_info;
116         u8 register_bit;
117
118         ACPI_FUNCTION_TRACE(ev_update_gpe_enable_masks);
119
120         gpe_register_info = gpe_event_info->register_info;
121         if (!gpe_register_info) {
122                 return_ACPI_STATUS(AE_NOT_EXIST);
123         }
124         register_bit = gpe_event_info->register_bit;
125
126         /* 1) Disable case.  Simply clear all enable bits */
127
128         if (type == ACPI_GPE_DISABLE) {
129                 ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake,
130                                register_bit);
131                 ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);
132                 return_ACPI_STATUS(AE_OK);
133         }
134
135         /* 2) Enable case.  Set/Clear the appropriate enable bits */
136
137         switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
138         case ACPI_GPE_TYPE_WAKE:
139                 ACPI_SET_BIT(gpe_register_info->enable_for_wake, register_bit);
140                 ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);
141                 break;
142
143         case ACPI_GPE_TYPE_RUNTIME:
144                 ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake,
145                                register_bit);
146                 ACPI_SET_BIT(gpe_register_info->enable_for_run, register_bit);
147                 break;
148
149         case ACPI_GPE_TYPE_WAKE_RUN:
150                 ACPI_SET_BIT(gpe_register_info->enable_for_wake, register_bit);
151                 ACPI_SET_BIT(gpe_register_info->enable_for_run, register_bit);
152                 break;
153
154         default:
155                 return_ACPI_STATUS(AE_BAD_PARAMETER);
156         }
157
158         return_ACPI_STATUS(AE_OK);
159 }
160
161 /*******************************************************************************
162  *
163  * FUNCTION:    acpi_ev_enable_gpe
164  *
165  * PARAMETERS:  gpe_event_info          - GPE to enable
166  *              write_to_hardware       - Enable now, or just mark data structs
167  *                                        (WAKE GPEs should be deferred)
168  *
169  * RETURN:      Status
170  *
171  * DESCRIPTION: Enable a GPE based on the GPE type
172  *
173  ******************************************************************************/
174
175 acpi_status
176 acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info,
177                    u8 write_to_hardware)
178 {
179         acpi_status status;
180
181         ACPI_FUNCTION_TRACE(ev_enable_gpe);
182
183         /* Make sure HW enable masks are updated */
184
185         status =
186             acpi_ev_update_gpe_enable_masks(gpe_event_info, ACPI_GPE_ENABLE);
187         if (ACPI_FAILURE(status)) {
188                 return_ACPI_STATUS(status);
189         }
190
191         /* Mark wake-enabled or HW enable, or both */
192
193         switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
194         case ACPI_GPE_TYPE_WAKE:
195
196                 ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
197                 break;
198
199         case ACPI_GPE_TYPE_WAKE_RUN:
200
201                 ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
202
203                 /*lint -fallthrough */
204
205         case ACPI_GPE_TYPE_RUNTIME:
206
207                 ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_RUN_ENABLED);
208
209                 if (write_to_hardware) {
210
211                         /* Clear the GPE (of stale events), then enable it */
212
213                         status = acpi_hw_clear_gpe(gpe_event_info);
214                         if (ACPI_FAILURE(status)) {
215                                 return_ACPI_STATUS(status);
216                         }
217
218                         /* Enable the requested runtime GPE */
219
220                         status = acpi_hw_write_gpe_enable_reg(gpe_event_info);
221                 }
222                 break;
223
224         default:
225                 return_ACPI_STATUS(AE_BAD_PARAMETER);
226         }
227
228         return_ACPI_STATUS(AE_OK);
229 }
230
231 /*******************************************************************************
232  *
233  * FUNCTION:    acpi_ev_disable_gpe
234  *
235  * PARAMETERS:  gpe_event_info          - GPE to disable
236  *
237  * RETURN:      Status
238  *
239  * DESCRIPTION: Disable a GPE based on the GPE type
240  *
241  ******************************************************************************/
242
243 acpi_status acpi_ev_disable_gpe(struct acpi_gpe_event_info *gpe_event_info)
244 {
245         acpi_status status;
246
247         ACPI_FUNCTION_TRACE(ev_disable_gpe);
248
249         if (!(gpe_event_info->flags & ACPI_GPE_ENABLE_MASK)) {
250                 return_ACPI_STATUS(AE_OK);
251         }
252
253         /* Make sure HW enable masks are updated */
254
255         status =
256             acpi_ev_update_gpe_enable_masks(gpe_event_info, ACPI_GPE_DISABLE);
257         if (ACPI_FAILURE(status)) {
258                 return_ACPI_STATUS(status);
259         }
260
261         /* Mark wake-disabled or HW disable, or both */
262
263         switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
264         case ACPI_GPE_TYPE_WAKE:
265                 ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
266                 break;
267
268         case ACPI_GPE_TYPE_WAKE_RUN:
269                 ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
270
271                 /*lint -fallthrough */
272
273         case ACPI_GPE_TYPE_RUNTIME:
274
275                 /* Disable the requested runtime GPE */
276
277                 ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_RUN_ENABLED);
278                 status = acpi_hw_write_gpe_enable_reg(gpe_event_info);
279                 break;
280
281         default:
282                 return_ACPI_STATUS(AE_BAD_PARAMETER);
283         }
284
285         return_ACPI_STATUS(AE_OK);
286 }
287
288 /*******************************************************************************
289  *
290  * FUNCTION:    acpi_ev_get_gpe_event_info
291  *
292  * PARAMETERS:  gpe_device          - Device node.  NULL for GPE0/GPE1
293  *              gpe_number          - Raw GPE number
294  *
295  * RETURN:      A GPE event_info struct. NULL if not a valid GPE
296  *
297  * DESCRIPTION: Returns the event_info struct associated with this GPE.
298  *              Validates the gpe_block and the gpe_number
299  *
300  *              Should be called only when the GPE lists are semaphore locked
301  *              and not subject to change.
302  *
303  ******************************************************************************/
304
305 struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device,
306                                                        u32 gpe_number)
307 {
308         union acpi_operand_object *obj_desc;
309         struct acpi_gpe_block_info *gpe_block;
310         acpi_native_uint i;
311
312         ACPI_FUNCTION_ENTRY();
313
314         /* A NULL gpe_block means use the FADT-defined GPE block(s) */
315
316         if (!gpe_device) {
317
318                 /* Examine GPE Block 0 and 1 (These blocks are permanent) */
319
320                 for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) {
321                         gpe_block = acpi_gbl_gpe_fadt_blocks[i];
322                         if (gpe_block) {
323                                 if ((gpe_number >= gpe_block->block_base_number)
324                                     && (gpe_number <
325                                         gpe_block->block_base_number +
326                                         (gpe_block->register_count * 8))) {
327                                         return (&gpe_block->
328                                                 event_info[gpe_number -
329                                                            gpe_block->
330                                                            block_base_number]);
331                                 }
332                         }
333                 }
334
335                 /* The gpe_number was not in the range of either FADT GPE block */
336
337                 return (NULL);
338         }
339
340         /* A Non-NULL gpe_device means this is a GPE Block Device */
341
342         obj_desc =
343             acpi_ns_get_attached_object((struct acpi_namespace_node *)
344                                         gpe_device);
345         if (!obj_desc || !obj_desc->device.gpe_block) {
346                 return (NULL);
347         }
348
349         gpe_block = obj_desc->device.gpe_block;
350
351         if ((gpe_number >= gpe_block->block_base_number) &&
352             (gpe_number <
353              gpe_block->block_base_number + (gpe_block->register_count * 8))) {
354                 return (&gpe_block->
355                         event_info[gpe_number - gpe_block->block_base_number]);
356         }
357
358         return (NULL);
359 }
360
361 /*******************************************************************************
362  *
363  * FUNCTION:    acpi_ev_gpe_detect
364  *
365  * PARAMETERS:  gpe_xrupt_list      - Interrupt block for this interrupt.
366  *                                    Can have multiple GPE blocks attached.
367  *
368  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
369  *
370  * DESCRIPTION: Detect if any GP events have occurred.  This function is
371  *              executed at interrupt level.
372  *
373  ******************************************************************************/
374
375 u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)
376 {
377         acpi_status status;
378         struct acpi_gpe_block_info *gpe_block;
379         struct acpi_gpe_register_info *gpe_register_info;
380         u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
381         u8 enabled_status_byte;
382         u32 status_reg;
383         u32 enable_reg;
384         acpi_cpu_flags flags;
385         acpi_native_uint i;
386         acpi_native_uint j;
387
388         ACPI_FUNCTION_NAME(ev_gpe_detect);
389
390         /* Check for the case where there are no GPEs */
391
392         if (!gpe_xrupt_list) {
393                 return (int_status);
394         }
395
396         /* Examine all GPE blocks attached to this interrupt level */
397
398         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
399         gpe_block = gpe_xrupt_list->gpe_block_list_head;
400         while (gpe_block) {
401                 /*
402                  * Read all of the 8-bit GPE status and enable registers
403                  * in this GPE block, saving all of them.
404                  * Find all currently active GP events.
405                  */
406                 for (i = 0; i < gpe_block->register_count; i++) {
407
408                         /* Get the next status/enable pair */
409
410                         gpe_register_info = &gpe_block->register_info[i];
411
412                         /* Read the Status Register */
413
414                         status =
415                             acpi_hw_low_level_read(ACPI_GPE_REGISTER_WIDTH,
416                                                    &status_reg,
417                                                    &gpe_register_info->
418                                                    status_address);
419                         if (ACPI_FAILURE(status)) {
420                                 goto unlock_and_exit;
421                         }
422
423                         /* Read the Enable Register */
424
425                         status =
426                             acpi_hw_low_level_read(ACPI_GPE_REGISTER_WIDTH,
427                                                    &enable_reg,
428                                                    &gpe_register_info->
429                                                    enable_address);
430                         if (ACPI_FAILURE(status)) {
431                                 goto unlock_and_exit;
432                         }
433
434                         ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
435                                           "Read GPE Register at GPE%X: Status=%02X, Enable=%02X\n",
436                                           gpe_register_info->base_gpe_number,
437                                           status_reg, enable_reg));
438
439                         /* Check if there is anything active at all in this register */
440
441                         enabled_status_byte = (u8) (status_reg & enable_reg);
442                         if (!enabled_status_byte) {
443
444                                 /* No active GPEs in this register, move on */
445
446                                 continue;
447                         }
448
449                         /* Now look at the individual GPEs in this byte register */
450
451                         for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
452
453                                 /* Examine one GPE bit */
454
455                                 if (enabled_status_byte &
456                                     acpi_gbl_decode_to8bit[j]) {
457                                         /*
458                                          * Found an active GPE. Dispatch the event to a handler
459                                          * or method.
460                                          */
461                                         int_status |=
462                                             acpi_ev_gpe_dispatch(&gpe_block->
463                                                                  event_info[(i *
464                                                                              ACPI_GPE_REGISTER_WIDTH)
465                                                                             +
466                                                                             j],
467                                                                  (u32) j +
468                                                                  gpe_register_info->
469                                                                  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
499 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context)
500 {
501         struct acpi_gpe_event_info *gpe_event_info = (void *)context;
502         u32 gpe_number = 0;
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
527          * info to 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
539          * time to avoid 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->parameters =
557                             ACPI_CAST_PTR(union acpi_operand_object *,
558                                           gpe_event_info);
559                         info->parameter_type = ACPI_PARAM_GPE;
560                         info->flags = ACPI_IGNORE_RETURN_VALUE;
561
562                         status = acpi_ns_evaluate(info);
563                         ACPI_FREE(info);
564                 }
565
566                 if (ACPI_FAILURE(status)) {
567                         ACPI_EXCEPTION((AE_INFO, status,
568                                         "While evaluating method [%4.4s] for GPE[%2X]",
569                                         acpi_ut_get_node_name
570                                         (local_gpe_event_info.dispatch.
571                                          method_node), gpe_number));
572                 }
573         }
574
575         if ((local_gpe_event_info.flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
576             ACPI_GPE_LEVEL_TRIGGERED) {
577                 /*
578                  * GPE is level-triggered, we clear the GPE status bit after
579                  * handling the event.
580                  */
581                 status = acpi_hw_clear_gpe(&local_gpe_event_info);
582                 if (ACPI_FAILURE(status)) {
583                         return_VOID;
584                 }
585         }
586
587         /* Enable this GPE */
588
589         (void)acpi_hw_write_gpe_enable_reg(&local_gpe_event_info);
590         return_VOID;
591 }
592
593 /*******************************************************************************
594  *
595  * FUNCTION:    acpi_ev_gpe_dispatch
596  *
597  * PARAMETERS:  gpe_event_info  - Info for this GPE
598  *              gpe_number      - Number relative to the parent GPE block
599  *
600  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
601  *
602  * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
603  *              or method (e.g. _Lxx/_Exx) handler.
604  *
605  *              This function executes at interrupt level.
606  *
607  ******************************************************************************/
608
609 u32
610 acpi_ev_gpe_dispatch(struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)
611 {
612         acpi_status status;
613
614         ACPI_FUNCTION_TRACE(ev_gpe_dispatch);
615
616         /*
617          * If edge-triggered, clear the GPE status bit now.  Note that
618          * level-triggered events are cleared after the GPE is serviced.
619          */
620         if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
621             ACPI_GPE_EDGE_TRIGGERED) {
622                 status = acpi_hw_clear_gpe(gpe_event_info);
623                 if (ACPI_FAILURE(status)) {
624                         ACPI_EXCEPTION((AE_INFO, status,
625                                         "Unable to clear GPE[%2X]",
626                                         gpe_number));
627                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
628                 }
629         }
630
631         /* Save current system state */
632
633         if (acpi_gbl_system_awake_and_running) {
634                 ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_SYSTEM_RUNNING);
635         } else {
636                 ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_SYSTEM_RUNNING);
637         }
638
639         /*
640          * Dispatch the GPE to either an installed handler, or the control
641          * method associated with this GPE (_Lxx or _Exx).
642          * If a handler exists, we invoke it and do not attempt to run the method.
643          * If there is neither a handler nor a method, we disable the level to
644          * prevent further events from coming in here.
645          */
646         switch (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) {
647         case ACPI_GPE_DISPATCH_HANDLER:
648
649                 /*
650                  * Invoke the installed handler (at interrupt level)
651                  * Ignore return status for now.  TBD: leave GPE disabled on error?
652                  */
653                 (void)gpe_event_info->dispatch.handler->address(gpe_event_info->
654                                                                 dispatch.
655                                                                 handler->
656                                                                 context);
657
658                 /* It is now safe to clear level-triggered events. */
659
660                 if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
661                     ACPI_GPE_LEVEL_TRIGGERED) {
662                         status = acpi_hw_clear_gpe(gpe_event_info);
663                         if (ACPI_FAILURE(status)) {
664                                 ACPI_EXCEPTION((AE_INFO, status,
665                                                 "Unable to clear GPE[%2X]",
666                                                 gpe_number));
667                                 return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
668                         }
669                 }
670                 break;
671
672         case ACPI_GPE_DISPATCH_METHOD:
673
674                 /*
675                  * Disable GPE, so it doesn't keep firing before the method has a
676                  * chance to run.
677                  */
678                 status = acpi_ev_disable_gpe(gpe_event_info);
679                 if (ACPI_FAILURE(status)) {
680                         ACPI_EXCEPTION((AE_INFO, status,
681                                         "Unable to disable GPE[%2X]",
682                                         gpe_number));
683                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
684                 }
685
686                 /*
687                  * Execute the method associated with the GPE
688                  * NOTE: Level-triggered GPEs are cleared after the method completes.
689                  */
690                 status = acpi_os_execute(OSL_GPE_HANDLER,
691                                          acpi_ev_asynch_execute_gpe_method,
692                                          gpe_event_info);
693                 if (ACPI_FAILURE(status)) {
694                         ACPI_EXCEPTION((AE_INFO, status,
695                                         "Unable to queue handler for GPE[%2X] - event disabled",
696                                         gpe_number));
697                 }
698                 break;
699
700         default:
701
702                 /* No handler or method to run! */
703
704                 ACPI_ERROR((AE_INFO,
705                             "No handler or method for GPE[%2X], disabling event",
706                             gpe_number));
707
708                 /*
709                  * Disable the GPE.  The GPE will remain disabled until the ACPI
710                  * Core Subsystem is restarted, or a handler is installed.
711                  */
712                 status = acpi_ev_disable_gpe(gpe_event_info);
713                 if (ACPI_FAILURE(status)) {
714                         ACPI_EXCEPTION((AE_INFO, status,
715                                         "Unable to disable GPE[%2X]",
716                                         gpe_number));
717                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
718                 }
719                 break;
720         }
721
722         return_UINT32(ACPI_INTERRUPT_HANDLED);
723 }
724
725 #ifdef ACPI_GPE_NOTIFY_CHECK
726 /*******************************************************************************
727  * TBD: NOT USED, PROTOTYPE ONLY AND WILL PROBABLY BE REMOVED
728  *
729  * FUNCTION:    acpi_ev_check_for_wake_only_gpe
730  *
731  * PARAMETERS:  gpe_event_info  - info for this GPE
732  *
733  * RETURN:      Status
734  *
735  * DESCRIPTION: Determine if a a GPE is "wake-only".
736  *
737  *              Called from Notify() code in interpreter when a "DeviceWake"
738  *              Notify comes in.
739  *
740  ******************************************************************************/
741
742 acpi_status
743 acpi_ev_check_for_wake_only_gpe(struct acpi_gpe_event_info *gpe_event_info)
744 {
745         acpi_status status;
746
747         ACPI_FUNCTION_TRACE(ev_check_for_wake_only_gpe);
748
749         if ((gpe_event_info) && /* Only >0 for _Lxx/_Exx */
750             ((gpe_event_info->flags & ACPI_GPE_SYSTEM_MASK) == ACPI_GPE_SYSTEM_RUNNING)) {      /* System state at GPE time */
751                 /* This must be a wake-only GPE, disable it */
752
753                 status = acpi_ev_disable_gpe(gpe_event_info);
754
755                 /* Set GPE to wake-only.  Do not change wake disabled/enabled status */
756
757                 acpi_ev_set_gpe_type(gpe_event_info, ACPI_GPE_TYPE_WAKE);
758
759                 ACPI_INFO((AE_INFO,
760                            "GPE %p was updated from wake/run to wake-only",
761                            gpe_event_info));
762
763                 /* This was a wake-only GPE */
764
765                 return_ACPI_STATUS(AE_WAKE_ONLY_GPE);
766         }
767
768         return_ACPI_STATUS(AE_OK);
769 }
770 #endif