Pull acpica into release branch
[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
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_cpu_flags hw_flags;
386         acpi_native_uint i;
387         acpi_native_uint j;
388
389         ACPI_FUNCTION_NAME(ev_gpe_detect);
390
391         /* Check for the case where there are no GPEs */
392
393         if (!gpe_xrupt_list) {
394                 return (int_status);
395         }
396
397         /* We need to hold the GPE lock now, hardware lock in the loop */
398
399         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
400
401         /* Examine all GPE blocks attached to this interrupt level */
402
403         gpe_block = gpe_xrupt_list->gpe_block_list_head;
404         while (gpe_block) {
405                 /*
406                  * Read all of the 8-bit GPE status and enable registers
407                  * in this GPE block, saving all of them.
408                  * Find all currently active GP events.
409                  */
410                 for (i = 0; i < gpe_block->register_count; i++) {
411
412                         /* Get the next status/enable pair */
413
414                         gpe_register_info = &gpe_block->register_info[i];
415
416                         hw_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
417
418                         /* Read the Status Register */
419
420                         status =
421                             acpi_hw_low_level_read(ACPI_GPE_REGISTER_WIDTH,
422                                                    &status_reg,
423                                                    &gpe_register_info->
424                                                    status_address);
425                         if (ACPI_FAILURE(status)) {
426                                 acpi_os_release_lock(acpi_gbl_hardware_lock,
427                                                      hw_flags);
428                                 goto unlock_and_exit;
429                         }
430
431                         /* Read the Enable Register */
432
433                         status =
434                             acpi_hw_low_level_read(ACPI_GPE_REGISTER_WIDTH,
435                                                    &enable_reg,
436                                                    &gpe_register_info->
437                                                    enable_address);
438                         acpi_os_release_lock(acpi_gbl_hardware_lock, hw_flags);
439
440                         if (ACPI_FAILURE(status)) {
441                                 goto unlock_and_exit;
442                         }
443
444                         ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
445                                           "Read GPE Register at GPE%X: Status=%02X, Enable=%02X\n",
446                                           gpe_register_info->base_gpe_number,
447                                           status_reg, enable_reg));
448
449                         /* Check if there is anything active at all in this register */
450
451                         enabled_status_byte = (u8) (status_reg & enable_reg);
452                         if (!enabled_status_byte) {
453
454                                 /* No active GPEs in this register, move on */
455
456                                 continue;
457                         }
458
459                         /* Now look at the individual GPEs in this byte register */
460
461                         for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
462
463                                 /* Examine one GPE bit */
464
465                                 if (enabled_status_byte &
466                                     acpi_gbl_decode_to8bit[j]) {
467                                         /*
468                                          * Found an active GPE. Dispatch the event to a handler
469                                          * or method.
470                                          */
471                                         int_status |=
472                                             acpi_ev_gpe_dispatch(&gpe_block->
473                                                                  event_info[(i *
474                                                                              ACPI_GPE_REGISTER_WIDTH)
475                                                                             +
476                                                                             j],
477                                                                  (u32) j +
478                                                                  gpe_register_info->
479                                                                  base_gpe_number);
480                                 }
481                         }
482                 }
483
484                 gpe_block = gpe_block->next;
485         }
486
487       unlock_and_exit:
488
489         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
490         return (int_status);
491 }
492
493 /*******************************************************************************
494  *
495  * FUNCTION:    acpi_ev_asynch_execute_gpe_method
496  *
497  * PARAMETERS:  Context (gpe_event_info) - Info for this GPE
498  *
499  * RETURN:      None
500  *
501  * DESCRIPTION: Perform the actual execution of a GPE control method. This
502  *              function is called from an invocation of acpi_os_execute and
503  *              therefore does NOT execute at interrupt level - so that
504  *              the control method itself is not executed in the context of
505  *              an interrupt handler.
506  *
507  ******************************************************************************/
508
509 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context)
510 {
511         struct acpi_gpe_event_info *gpe_event_info = (void *)context;
512         acpi_status status;
513         struct acpi_gpe_event_info local_gpe_event_info;
514         struct acpi_evaluate_info *info;
515
516         ACPI_FUNCTION_TRACE(ev_asynch_execute_gpe_method);
517
518         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
519         if (ACPI_FAILURE(status)) {
520                 return_VOID;
521         }
522
523         /* Must revalidate the gpe_number/gpe_block */
524
525         if (!acpi_ev_valid_gpe_event(gpe_event_info)) {
526                 status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
527                 return_VOID;
528         }
529
530         /* Set the GPE flags for return to enabled state */
531
532         (void)acpi_ev_enable_gpe(gpe_event_info, FALSE);
533
534         /*
535          * Take a snapshot of the GPE info for this level - we copy the
536          * info to prevent a race condition with remove_handler/remove_block.
537          */
538         ACPI_MEMCPY(&local_gpe_event_info, gpe_event_info,
539                     sizeof(struct acpi_gpe_event_info));
540
541         status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
542         if (ACPI_FAILURE(status)) {
543                 return_VOID;
544         }
545
546         /*
547          * Must check for control method type dispatch one more
548          * time to avoid race with ev_gpe_install_handler
549          */
550         if ((local_gpe_event_info.flags & ACPI_GPE_DISPATCH_MASK) ==
551             ACPI_GPE_DISPATCH_METHOD) {
552
553                 /* Allocate the evaluation information block */
554
555                 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
556                 if (!info) {
557                         status = AE_NO_MEMORY;
558                 } else {
559                         /*
560                          * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the _Lxx/_Exx
561                          * control method that corresponds to this GPE
562                          */
563                         info->prefix_node =
564                             local_gpe_event_info.dispatch.method_node;
565                         info->parameters =
566                             ACPI_CAST_PTR(union acpi_operand_object *,
567                                           gpe_event_info);
568                         info->parameter_type = ACPI_PARAM_GPE;
569                         info->flags = ACPI_IGNORE_RETURN_VALUE;
570
571                         status = acpi_ns_evaluate(info);
572                         ACPI_FREE(info);
573                 }
574
575                 if (ACPI_FAILURE(status)) {
576                         ACPI_EXCEPTION((AE_INFO, status,
577                                         "While evaluating GPE method [%4.4s]",
578                                         acpi_ut_get_node_name
579                                         (local_gpe_event_info.dispatch.
580                                          method_node)));
581                 }
582         }
583
584         if ((local_gpe_event_info.flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
585             ACPI_GPE_LEVEL_TRIGGERED) {
586                 /*
587                  * GPE is level-triggered, we clear the GPE status bit after
588                  * handling the event.
589                  */
590                 status = acpi_hw_clear_gpe(&local_gpe_event_info);
591                 if (ACPI_FAILURE(status)) {
592                         return_VOID;
593                 }
594         }
595
596         /* Enable this GPE */
597
598         (void)acpi_hw_write_gpe_enable_reg(&local_gpe_event_info);
599         return_VOID;
600 }
601
602 /*******************************************************************************
603  *
604  * FUNCTION:    acpi_ev_gpe_dispatch
605  *
606  * PARAMETERS:  gpe_event_info  - Info for this GPE
607  *              gpe_number      - Number relative to the parent GPE block
608  *
609  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
610  *
611  * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
612  *              or method (e.g. _Lxx/_Exx) handler.
613  *
614  *              This function executes at interrupt level.
615  *
616  ******************************************************************************/
617
618 u32
619 acpi_ev_gpe_dispatch(struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)
620 {
621         acpi_status status;
622
623         ACPI_FUNCTION_TRACE(ev_gpe_dispatch);
624
625         /*
626          * If edge-triggered, clear the GPE status bit now.  Note that
627          * level-triggered events are cleared after the GPE is serviced.
628          */
629         if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
630             ACPI_GPE_EDGE_TRIGGERED) {
631                 status = acpi_hw_clear_gpe(gpe_event_info);
632                 if (ACPI_FAILURE(status)) {
633                         ACPI_EXCEPTION((AE_INFO, status,
634                                         "Unable to clear GPE[%2X]",
635                                         gpe_number));
636                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
637                 }
638         }
639
640         /* Save current system state */
641
642         if (acpi_gbl_system_awake_and_running) {
643                 ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_SYSTEM_RUNNING);
644         } else {
645                 ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_SYSTEM_RUNNING);
646         }
647
648         /*
649          * Dispatch the GPE to either an installed handler, or the control
650          * method associated with this GPE (_Lxx or _Exx).
651          * If a handler exists, we invoke it and do not attempt to run the method.
652          * If there is neither a handler nor a method, we disable the level to
653          * prevent further events from coming in here.
654          */
655         switch (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) {
656         case ACPI_GPE_DISPATCH_HANDLER:
657
658                 /*
659                  * Invoke the installed handler (at interrupt level)
660                  * Ignore return status for now.  TBD: leave GPE disabled on error?
661                  */
662                 (void)gpe_event_info->dispatch.handler->address(gpe_event_info->
663                                                                 dispatch.
664                                                                 handler->
665                                                                 context);
666
667                 /* It is now safe to clear level-triggered events. */
668
669                 if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
670                     ACPI_GPE_LEVEL_TRIGGERED) {
671                         status = acpi_hw_clear_gpe(gpe_event_info);
672                         if (ACPI_FAILURE(status)) {
673                                 ACPI_EXCEPTION((AE_INFO, status,
674                                                 "Unable to clear GPE[%2X]",
675                                                 gpe_number));
676                                 return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
677                         }
678                 }
679                 break;
680
681         case ACPI_GPE_DISPATCH_METHOD:
682
683                 /*
684                  * Disable GPE, so it doesn't keep firing before the method has a
685                  * chance to run.
686                  */
687                 status = acpi_ev_disable_gpe(gpe_event_info);
688                 if (ACPI_FAILURE(status)) {
689                         ACPI_EXCEPTION((AE_INFO, status,
690                                         "Unable to disable GPE[%2X]",
691                                         gpe_number));
692                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
693                 }
694
695                 /*
696                  * Execute the method associated with the GPE
697                  * NOTE: Level-triggered GPEs are cleared after the method completes.
698                  */
699                 status = acpi_os_execute(OSL_GPE_HANDLER,
700                                          acpi_ev_asynch_execute_gpe_method,
701                                          gpe_event_info);
702                 if (ACPI_FAILURE(status)) {
703                         ACPI_EXCEPTION((AE_INFO, status,
704                                         "Unable to queue handler for GPE[%2X] - event disabled",
705                                         gpe_number));
706                 }
707                 break;
708
709         default:
710
711                 /* No handler or method to run! */
712
713                 ACPI_ERROR((AE_INFO,
714                             "No handler or method for GPE[%2X], disabling event",
715                             gpe_number));
716
717                 /*
718                  * Disable the GPE.  The GPE will remain disabled until the ACPI
719                  * Core Subsystem is restarted, or a handler is installed.
720                  */
721                 status = acpi_ev_disable_gpe(gpe_event_info);
722                 if (ACPI_FAILURE(status)) {
723                         ACPI_EXCEPTION((AE_INFO, status,
724                                         "Unable to disable GPE[%2X]",
725                                         gpe_number));
726                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
727                 }
728                 break;
729         }
730
731         return_UINT32(ACPI_INTERRUPT_HANDLED);
732 }
733
734 #ifdef ACPI_GPE_NOTIFY_CHECK
735 /*******************************************************************************
736  * TBD: NOT USED, PROTOTYPE ONLY AND WILL PROBABLY BE REMOVED
737  *
738  * FUNCTION:    acpi_ev_check_for_wake_only_gpe
739  *
740  * PARAMETERS:  gpe_event_info  - info for this GPE
741  *
742  * RETURN:      Status
743  *
744  * DESCRIPTION: Determine if a a GPE is "wake-only".
745  *
746  *              Called from Notify() code in interpreter when a "DeviceWake"
747  *              Notify comes in.
748  *
749  ******************************************************************************/
750
751 acpi_status
752 acpi_ev_check_for_wake_only_gpe(struct acpi_gpe_event_info *gpe_event_info)
753 {
754         acpi_status status;
755
756         ACPI_FUNCTION_TRACE(ev_check_for_wake_only_gpe);
757
758         if ((gpe_event_info) && /* Only >0 for _Lxx/_Exx */
759             ((gpe_event_info->flags & ACPI_GPE_SYSTEM_MASK) == ACPI_GPE_SYSTEM_RUNNING)) {      /* System state at GPE time */
760                 /* This must be a wake-only GPE, disable it */
761
762                 status = acpi_ev_disable_gpe(gpe_event_info);
763
764                 /* Set GPE to wake-only.  Do not change wake disabled/enabled status */
765
766                 acpi_ev_set_gpe_type(gpe_event_info, ACPI_GPE_TYPE_WAKE);
767
768                 ACPI_INFO((AE_INFO,
769                            "GPE %p was updated from wake/run to wake-only",
770                            gpe_event_info));
771
772                 /* This was a wake-only GPE */
773
774                 return_ACPI_STATUS(AE_WAKE_ONLY_GPE);
775         }
776
777         return_ACPI_STATUS(AE_OK);
778 }
779 #endif