[PATCH] cfq-iosched: fix crash in do_div()
[linux-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                         /* Clear the GPE (of stale events), then enable it */
211
212                         status = acpi_hw_clear_gpe(gpe_event_info);
213                         if (ACPI_FAILURE(status)) {
214                                 return_ACPI_STATUS(status);
215                         }
216
217                         /* Enable the requested runtime GPE */
218
219                         status = acpi_hw_write_gpe_enable_reg(gpe_event_info);
220                 }
221                 break;
222
223         default:
224                 return_ACPI_STATUS(AE_BAD_PARAMETER);
225         }
226
227         return_ACPI_STATUS(AE_OK);
228 }
229
230 /*******************************************************************************
231  *
232  * FUNCTION:    acpi_ev_disable_gpe
233  *
234  * PARAMETERS:  gpe_event_info          - GPE to disable
235  *
236  * RETURN:      Status
237  *
238  * DESCRIPTION: Disable a GPE based on the GPE type
239  *
240  ******************************************************************************/
241
242 acpi_status acpi_ev_disable_gpe(struct acpi_gpe_event_info *gpe_event_info)
243 {
244         acpi_status status;
245
246         ACPI_FUNCTION_TRACE("ev_disable_gpe");
247
248         if (!(gpe_event_info->flags & ACPI_GPE_ENABLE_MASK)) {
249                 return_ACPI_STATUS(AE_OK);
250         }
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         /* Mark wake-disabled or HW disable, or both */
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                 /*lint -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                 status = acpi_hw_write_gpe_enable_reg(gpe_event_info);
278                 break;
279
280         default:
281                 return_ACPI_STATUS(AE_BAD_PARAMETER);
282         }
283
284         return_ACPI_STATUS(AE_OK);
285 }
286
287 /*******************************************************************************
288  *
289  * FUNCTION:    acpi_ev_get_gpe_event_info
290  *
291  * PARAMETERS:  gpe_device          - Device node.  NULL for GPE0/GPE1
292  *              gpe_number          - Raw GPE number
293  *
294  * RETURN:      A GPE event_info struct. NULL if not a valid GPE
295  *
296  * DESCRIPTION: Returns the event_info struct associated with this GPE.
297  *              Validates the gpe_block and the gpe_number
298  *
299  *              Should be called only when the GPE lists are semaphore locked
300  *              and not subject to change.
301  *
302  ******************************************************************************/
303
304 struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device,
305                                                        u32 gpe_number)
306 {
307         union acpi_operand_object *obj_desc;
308         struct acpi_gpe_block_info *gpe_block;
309         acpi_native_uint i;
310
311         ACPI_FUNCTION_ENTRY();
312
313         /* A NULL gpe_block means use the FADT-defined GPE block(s) */
314
315         if (!gpe_device) {
316                 /* Examine GPE Block 0 and 1 (These blocks are permanent) */
317
318                 for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) {
319                         gpe_block = acpi_gbl_gpe_fadt_blocks[i];
320                         if (gpe_block) {
321                                 if ((gpe_number >= gpe_block->block_base_number)
322                                     && (gpe_number <
323                                         gpe_block->block_base_number +
324                                         (gpe_block->register_count * 8))) {
325                                         return (&gpe_block->
326                                                 event_info[gpe_number -
327                                                            gpe_block->
328                                                            block_base_number]);
329                                 }
330                         }
331                 }
332
333                 /* The gpe_number was not in the range of either FADT GPE block */
334
335                 return (NULL);
336         }
337
338         /* A Non-NULL gpe_device means this is a GPE Block Device */
339
340         obj_desc =
341             acpi_ns_get_attached_object((struct acpi_namespace_node *)
342                                         gpe_device);
343         if (!obj_desc || !obj_desc->device.gpe_block) {
344                 return (NULL);
345         }
346
347         gpe_block = obj_desc->device.gpe_block;
348
349         if ((gpe_number >= gpe_block->block_base_number) &&
350             (gpe_number <
351              gpe_block->block_base_number + (gpe_block->register_count * 8))) {
352                 return (&gpe_block->
353                         event_info[gpe_number - gpe_block->block_base_number]);
354         }
355
356         return (NULL);
357 }
358
359 /*******************************************************************************
360  *
361  * FUNCTION:    acpi_ev_gpe_detect
362  *
363  * PARAMETERS:  gpe_xrupt_list      - Interrupt block for this interrupt.
364  *                                    Can have multiple GPE blocks attached.
365  *
366  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
367  *
368  * DESCRIPTION: Detect if any GP events have occurred.  This function is
369  *              executed at interrupt level.
370  *
371  ******************************************************************************/
372
373 u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)
374 {
375         acpi_status status;
376         struct acpi_gpe_block_info *gpe_block;
377         struct acpi_gpe_register_info *gpe_register_info;
378         u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
379         u8 enabled_status_byte;
380         u32 status_reg;
381         u32 enable_reg;
382         acpi_cpu_flags flags;
383         acpi_native_uint i;
384         acpi_native_uint j;
385
386         ACPI_FUNCTION_NAME("ev_gpe_detect");
387
388         /* Check for the case where there are no GPEs */
389
390         if (!gpe_xrupt_list) {
391                 return (int_status);
392         }
393
394         /* Examine all GPE blocks attached to this interrupt level */
395
396         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
397         gpe_block = gpe_xrupt_list->gpe_block_list_head;
398         while (gpe_block) {
399                 /*
400                  * Read all of the 8-bit GPE status and enable registers
401                  * in this GPE block, saving all of them.
402                  * Find all currently active GP events.
403                  */
404                 for (i = 0; i < gpe_block->register_count; i++) {
405                         /* Get the next status/enable pair */
406
407                         gpe_register_info = &gpe_block->register_info[i];
408
409                         /* Read the Status Register */
410
411                         status =
412                             acpi_hw_low_level_read(ACPI_GPE_REGISTER_WIDTH,
413                                                    &status_reg,
414                                                    &gpe_register_info->
415                                                    status_address);
416                         if (ACPI_FAILURE(status)) {
417                                 goto unlock_and_exit;
418                         }
419
420                         /* Read the Enable Register */
421
422                         status =
423                             acpi_hw_low_level_read(ACPI_GPE_REGISTER_WIDTH,
424                                                    &enable_reg,
425                                                    &gpe_register_info->
426                                                    enable_address);
427                         if (ACPI_FAILURE(status)) {
428                                 goto unlock_and_exit;
429                         }
430
431                         ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
432                                           "Read GPE Register at GPE%X: Status=%02X, Enable=%02X\n",
433                                           gpe_register_info->base_gpe_number,
434                                           status_reg, enable_reg));
435
436                         /* Check if there is anything active at all in this register */
437
438                         enabled_status_byte = (u8) (status_reg & enable_reg);
439                         if (!enabled_status_byte) {
440                                 /* No active GPEs in this register, move on */
441
442                                 continue;
443                         }
444
445                         /* Now look at the individual GPEs in this byte register */
446
447                         for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
448                                 /* Examine one GPE bit */
449
450                                 if (enabled_status_byte &
451                                     acpi_gbl_decode_to8bit[j]) {
452                                         /*
453                                          * Found an active GPE. Dispatch the event to a handler
454                                          * or method.
455                                          */
456                                         int_status |=
457                                             acpi_ev_gpe_dispatch(&gpe_block->
458                                                                  event_info[(i *
459                                                                              ACPI_GPE_REGISTER_WIDTH)
460                                                                             +
461                                                                             j],
462                                                                  (u32) j +
463                                                                  gpe_register_info->
464                                                                  base_gpe_number);
465                                 }
466                         }
467                 }
468
469                 gpe_block = gpe_block->next;
470         }
471
472       unlock_and_exit:
473
474         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
475         return (int_status);
476 }
477
478 /*******************************************************************************
479  *
480  * FUNCTION:    acpi_ev_asynch_execute_gpe_method
481  *
482  * PARAMETERS:  Context (gpe_event_info) - Info for this GPE
483  *
484  * RETURN:      None
485  *
486  * DESCRIPTION: Perform the actual execution of a GPE control method.  This
487  *              function is called from an invocation of acpi_os_queue_for_execution
488  *              (and therefore does NOT execute at interrupt level) so that
489  *              the control method itself is not executed in the context of
490  *              an interrupt handler.
491  *
492  ******************************************************************************/
493
494 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context)
495 {
496         struct acpi_gpe_event_info *gpe_event_info = (void *)context;
497         u32 gpe_number = 0;
498         acpi_status status;
499         struct acpi_gpe_event_info local_gpe_event_info;
500         struct acpi_parameter_info info;
501
502         ACPI_FUNCTION_TRACE("ev_asynch_execute_gpe_method");
503
504         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
505         if (ACPI_FAILURE(status)) {
506                 return_VOID;
507         }
508
509         /* Must revalidate the gpe_number/gpe_block */
510
511         if (!acpi_ev_valid_gpe_event(gpe_event_info)) {
512                 status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
513                 return_VOID;
514         }
515
516         /* Set the GPE flags for return to enabled state */
517
518         (void)acpi_ev_enable_gpe(gpe_event_info, FALSE);
519
520         /*
521          * Take a snapshot of the GPE info for this level - we copy the
522          * info to prevent a race condition with remove_handler/remove_block.
523          */
524         ACPI_MEMCPY(&local_gpe_event_info, gpe_event_info,
525                     sizeof(struct acpi_gpe_event_info));
526
527         status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
528         if (ACPI_FAILURE(status)) {
529                 return_VOID;
530         }
531
532         /*
533          * Must check for control method type dispatch one more
534          * time to avoid race with ev_gpe_install_handler
535          */
536         if ((local_gpe_event_info.flags & ACPI_GPE_DISPATCH_MASK) ==
537             ACPI_GPE_DISPATCH_METHOD) {
538                 /*
539                  * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the _Lxx/_Exx
540                  * control method that corresponds to this GPE
541                  */
542                 info.node = local_gpe_event_info.dispatch.method_node;
543                 info.parameters =
544                     ACPI_CAST_PTR(union acpi_operand_object *, gpe_event_info);
545                 info.parameter_type = ACPI_PARAM_GPE;
546
547                 status = acpi_ns_evaluate_by_handle(&info);
548                 if (ACPI_FAILURE(status)) {
549                         ACPI_EXCEPTION((AE_INFO, status,
550                                         "While evaluating method [%4.4s] for GPE[%2X]",
551                                         acpi_ut_get_node_name
552                                         (local_gpe_event_info.dispatch.
553                                          method_node), gpe_number));
554                 }
555         }
556
557         if ((local_gpe_event_info.flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
558             ACPI_GPE_LEVEL_TRIGGERED) {
559                 /*
560                  * GPE is level-triggered, we clear the GPE status bit after
561                  * handling the event.
562                  */
563                 status = acpi_hw_clear_gpe(&local_gpe_event_info);
564                 if (ACPI_FAILURE(status)) {
565                         return_VOID;
566                 }
567         }
568
569         /* Enable this GPE */
570
571         (void)acpi_hw_write_gpe_enable_reg(&local_gpe_event_info);
572         return_VOID;
573 }
574
575 /*******************************************************************************
576  *
577  * FUNCTION:    acpi_ev_gpe_dispatch
578  *
579  * PARAMETERS:  gpe_event_info  - Info for this GPE
580  *              gpe_number      - Number relative to the parent GPE block
581  *
582  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
583  *
584  * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
585  *              or method (e.g. _Lxx/_Exx) handler.
586  *
587  *              This function executes at interrupt level.
588  *
589  ******************************************************************************/
590
591 u32
592 acpi_ev_gpe_dispatch(struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)
593 {
594         acpi_status status;
595
596         ACPI_FUNCTION_TRACE("ev_gpe_dispatch");
597
598         /*
599          * If edge-triggered, clear the GPE status bit now.  Note that
600          * level-triggered events are cleared after the GPE is serviced.
601          */
602         if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
603             ACPI_GPE_EDGE_TRIGGERED) {
604                 status = acpi_hw_clear_gpe(gpe_event_info);
605                 if (ACPI_FAILURE(status)) {
606                         ACPI_EXCEPTION((AE_INFO, status,
607                                         "Unable to clear GPE[%2X]",
608                                         gpe_number));
609                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
610                 }
611         }
612
613         /* Save current system state */
614
615         if (acpi_gbl_system_awake_and_running) {
616                 ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_SYSTEM_RUNNING);
617         } else {
618                 ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_SYSTEM_RUNNING);
619         }
620
621         /*
622          * Dispatch the GPE to either an installed handler, or the control
623          * method associated with this GPE (_Lxx or _Exx).
624          * If a handler exists, we invoke it and do not attempt to run the method.
625          * If there is neither a handler nor a method, we disable the level to
626          * prevent further events from coming in here.
627          */
628         switch (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) {
629         case ACPI_GPE_DISPATCH_HANDLER:
630
631                 /*
632                  * Invoke the installed handler (at interrupt level)
633                  * Ignore return status for now.  TBD: leave GPE disabled on error?
634                  */
635                 (void)gpe_event_info->dispatch.handler->address(gpe_event_info->
636                                                                 dispatch.
637                                                                 handler->
638                                                                 context);
639
640                 /* It is now safe to clear level-triggered events. */
641
642                 if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
643                     ACPI_GPE_LEVEL_TRIGGERED) {
644                         status = acpi_hw_clear_gpe(gpe_event_info);
645                         if (ACPI_FAILURE(status)) {
646                                 ACPI_EXCEPTION((AE_INFO, status,
647                                                 "Unable to clear GPE[%2X]",
648                                                 gpe_number));
649                                 return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
650                         }
651                 }
652                 break;
653
654         case ACPI_GPE_DISPATCH_METHOD:
655
656                 /*
657                  * Disable GPE, so it doesn't keep firing before the method has a
658                  * chance to run.
659                  */
660                 status = acpi_ev_disable_gpe(gpe_event_info);
661                 if (ACPI_FAILURE(status)) {
662                         ACPI_EXCEPTION((AE_INFO, status,
663                                         "Unable to disable GPE[%2X]",
664                                         gpe_number));
665                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
666                 }
667
668                 /*
669                  * Execute the method associated with the GPE
670                  * NOTE: Level-triggered GPEs are cleared after the method completes.
671                  */
672                 status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
673                                                      acpi_ev_asynch_execute_gpe_method,
674                                                      gpe_event_info);
675                 if (ACPI_FAILURE(status)) {
676                         ACPI_EXCEPTION((AE_INFO, status,
677                                         "Unable to queue handler for GPE[%2X] - event disabled",
678                                         gpe_number));
679                 }
680                 break;
681
682         default:
683
684                 /* No handler or method to run! */
685
686                 ACPI_ERROR((AE_INFO,
687                             "No handler or method for GPE[%2X], disabling event",
688                             gpe_number));
689
690                 /*
691                  * Disable the GPE.  The GPE will remain disabled until the ACPI
692                  * Core Subsystem is restarted, or a handler is installed.
693                  */
694                 status = acpi_ev_disable_gpe(gpe_event_info);
695                 if (ACPI_FAILURE(status)) {
696                         ACPI_EXCEPTION((AE_INFO, status,
697                                         "Unable to disable GPE[%2X]",
698                                         gpe_number));
699                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
700                 }
701                 break;
702         }
703
704         return_UINT32(ACPI_INTERRUPT_HANDLED);
705 }
706
707 #ifdef ACPI_GPE_NOTIFY_CHECK
708 /*******************************************************************************
709  * TBD: NOT USED, PROTOTYPE ONLY AND WILL PROBABLY BE REMOVED
710  *
711  * FUNCTION:    acpi_ev_check_for_wake_only_gpe
712  *
713  * PARAMETERS:  gpe_event_info  - info for this GPE
714  *
715  * RETURN:      Status
716  *
717  * DESCRIPTION: Determine if a a GPE is "wake-only".
718  *
719  *              Called from Notify() code in interpreter when a "device_wake"
720  *              Notify comes in.
721  *
722  ******************************************************************************/
723
724 acpi_status
725 acpi_ev_check_for_wake_only_gpe(struct acpi_gpe_event_info *gpe_event_info)
726 {
727         acpi_status status;
728
729         ACPI_FUNCTION_TRACE("ev_check_for_wake_only_gpe");
730
731         if ((gpe_event_info) && /* Only >0 for _Lxx/_Exx */
732             ((gpe_event_info->flags & ACPI_GPE_SYSTEM_MASK) == ACPI_GPE_SYSTEM_RUNNING)) {      /* System state at GPE time */
733                 /* This must be a wake-only GPE, disable it */
734
735                 status = acpi_ev_disable_gpe(gpe_event_info);
736
737                 /* Set GPE to wake-only.  Do not change wake disabled/enabled status */
738
739                 acpi_ev_set_gpe_type(gpe_event_info, ACPI_GPE_TYPE_WAKE);
740
741                 ACPI_INFO((AE_INFO,
742                            "GPE %p was updated from wake/run to wake-only",
743                            gpe_event_info));
744
745                 /* This was a wake-only GPE */
746
747                 return_ACPI_STATUS(AE_WAKE_ONLY_GPE);
748         }
749
750         return_ACPI_STATUS(AE_OK);
751 }
752 #endif