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Merge branch 'r6040-next'
[linux/fpc-iii.git] / drivers / acpi / acpica / evgpe.c
blob4b4949ce05bc2bdd0ef8940737cee7d18f5b9c5b
1 /******************************************************************************
2 *
3 * Module Name: evgpe - General Purpose Event handling and dispatch
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2016, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44 #include <acpi/acpi.h>
45 #include "accommon.h"
46 #include "acevents.h"
47 #include "acnamesp.h"
48
49 #define _COMPONENT ACPI_EVENTS
50 ACPI_MODULE_NAME("evgpe")
51 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
52 /* Local prototypes */
53 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context);
54
55 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_enable_gpe(void *context);
56
57 /*******************************************************************************
58 *
59 * FUNCTION: acpi_ev_update_gpe_enable_mask
60 *
61 * PARAMETERS: gpe_event_info - GPE to update
62 *
63 * RETURN: Status
64 *
65 * DESCRIPTION: Updates GPE register enable mask based upon whether there are
66 * runtime references to this GPE
67 *
68 ******************************************************************************/
69
70 acpi_status
71 acpi_ev_update_gpe_enable_mask(struct acpi_gpe_event_info *gpe_event_info)
72 {
73 struct acpi_gpe_register_info *gpe_register_info;
74 u32 register_bit;
75
76 ACPI_FUNCTION_TRACE(ev_update_gpe_enable_mask);
77
78 gpe_register_info = gpe_event_info->register_info;
79 if (!gpe_register_info) {
80 return_ACPI_STATUS(AE_NOT_EXIST);
81 }
82
83 register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info);
84
85 /* Clear the run bit up front */
86
87 ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);
88
89 /* Set the mask bit only if there are references to this GPE */
90
91 if (gpe_event_info->runtime_count) {
92 ACPI_SET_BIT(gpe_register_info->enable_for_run,
93 (u8)register_bit);
94 }
95
96 gpe_register_info->enable_mask = gpe_register_info->enable_for_run;
97 return_ACPI_STATUS(AE_OK);
98 }
99
100 /*******************************************************************************
101 *
102 * FUNCTION: acpi_ev_enable_gpe
103 *
104 * PARAMETERS: gpe_event_info - GPE to enable
105 *
106 * RETURN: Status
107 *
108 * DESCRIPTION: Clear a GPE of stale events and enable it.
109 *
110 ******************************************************************************/
111
112 acpi_status acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info)
113 {
114 acpi_status status;
115
116 ACPI_FUNCTION_TRACE(ev_enable_gpe);
117
118 /* Clear the GPE (of stale events) */
119
120 status = acpi_hw_clear_gpe(gpe_event_info);
121 if (ACPI_FAILURE(status)) {
122 return_ACPI_STATUS(status);
123 }
124
125 /* Enable the requested GPE */
126
127 status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_ENABLE);
128 return_ACPI_STATUS(status);
129 }
130
131 /*******************************************************************************
132 *
133 * FUNCTION: acpi_ev_add_gpe_reference
134 *
135 * PARAMETERS: gpe_event_info - Add a reference to this GPE
136 *
137 * RETURN: Status
138 *
139 * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
140 * hardware-enabled.
141 *
142 ******************************************************************************/
143
144 acpi_status
145 acpi_ev_add_gpe_reference(struct acpi_gpe_event_info *gpe_event_info)
146 {
147 acpi_status status = AE_OK;
148
149 ACPI_FUNCTION_TRACE(ev_add_gpe_reference);
150
151 if (gpe_event_info->runtime_count == ACPI_UINT8_MAX) {
152 return_ACPI_STATUS(AE_LIMIT);
153 }
154
155 gpe_event_info->runtime_count++;
156 if (gpe_event_info->runtime_count == 1) {
157
158 /* Enable on first reference */
159
160 status = acpi_ev_update_gpe_enable_mask(gpe_event_info);
161 if (ACPI_SUCCESS(status)) {
162 status = acpi_ev_enable_gpe(gpe_event_info);
163 }
164
165 if (ACPI_FAILURE(status)) {
166 gpe_event_info->runtime_count--;
167 }
168 }
169
170 return_ACPI_STATUS(status);
171 }
172
173 /*******************************************************************************
174 *
175 * FUNCTION: acpi_ev_remove_gpe_reference
176 *
177 * PARAMETERS: gpe_event_info - Remove a reference to this GPE
178 *
179 * RETURN: Status
180 *
181 * DESCRIPTION: Remove a reference to a GPE. When the last reference is
182 * removed, the GPE is hardware-disabled.
183 *
184 ******************************************************************************/
185
186 acpi_status
187 acpi_ev_remove_gpe_reference(struct acpi_gpe_event_info *gpe_event_info)
188 {
189 acpi_status status = AE_OK;
190
191 ACPI_FUNCTION_TRACE(ev_remove_gpe_reference);
192
193 if (!gpe_event_info->runtime_count) {
194 return_ACPI_STATUS(AE_LIMIT);
195 }
196
197 gpe_event_info->runtime_count--;
198 if (!gpe_event_info->runtime_count) {
199
200 /* Disable on last reference */
201
202 status = acpi_ev_update_gpe_enable_mask(gpe_event_info);
203 if (ACPI_SUCCESS(status)) {
204 status =
205 acpi_hw_low_set_gpe(gpe_event_info,
206 ACPI_GPE_DISABLE);
207 }
208
209 if (ACPI_FAILURE(status)) {
210 gpe_event_info->runtime_count++;
211 }
212 }
213
214 return_ACPI_STATUS(status);
215 }
216
217 /*******************************************************************************
218 *
219 * FUNCTION: acpi_ev_low_get_gpe_info
220 *
221 * PARAMETERS: gpe_number - Raw GPE number
222 * gpe_block - A GPE info block
223 *
224 * RETURN: A GPE event_info struct. NULL if not a valid GPE (The gpe_number
225 * is not within the specified GPE block)
226 *
227 * DESCRIPTION: Returns the event_info struct associated with this GPE. This is
228 * the low-level implementation of ev_get_gpe_event_info.
229 *
230 ******************************************************************************/
231
232 struct acpi_gpe_event_info *acpi_ev_low_get_gpe_info(u32 gpe_number,
233 struct acpi_gpe_block_info
234 *gpe_block)
235 {
236 u32 gpe_index;
237
238 /*
239 * Validate that the gpe_number is within the specified gpe_block.
240 * (Two steps)
241 */
242 if (!gpe_block || (gpe_number < gpe_block->block_base_number)) {
243 return (NULL);
244 }
245
246 gpe_index = gpe_number - gpe_block->block_base_number;
247 if (gpe_index >= gpe_block->gpe_count) {
248 return (NULL);
249 }
250
251 return (&gpe_block->event_info[gpe_index]);
252 }
253
254
255 /*******************************************************************************
256 *
257 * FUNCTION: acpi_ev_get_gpe_event_info
258 *
259 * PARAMETERS: gpe_device - Device node. NULL for GPE0/GPE1
260 * gpe_number - Raw GPE number
261 *
262 * RETURN: A GPE event_info struct. NULL if not a valid GPE
263 *
264 * DESCRIPTION: Returns the event_info struct associated with this GPE.
265 * Validates the gpe_block and the gpe_number
266 *
267 * Should be called only when the GPE lists are semaphore locked
268 * and not subject to change.
269 *
270 ******************************************************************************/
271
272 struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device,
273 u32 gpe_number)
274 {
275 union acpi_operand_object *obj_desc;
276 struct acpi_gpe_event_info *gpe_info;
277 u32 i;
278
279 ACPI_FUNCTION_ENTRY();
280
281 /* A NULL gpe_device means use the FADT-defined GPE block(s) */
282
283 if (!gpe_device) {
284
285 /* Examine GPE Block 0 and 1 (These blocks are permanent) */
286
287 for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) {
288 gpe_info = acpi_ev_low_get_gpe_info(gpe_number,
289 acpi_gbl_gpe_fadt_blocks
290 [i]);
291 if (gpe_info) {
292 return (gpe_info);
293 }
294 }
295
296 /* The gpe_number was not in the range of either FADT GPE block */
297
298 return (NULL);
299 }
300
301 /* A Non-NULL gpe_device means this is a GPE Block Device */
302
303 obj_desc =
304 acpi_ns_get_attached_object((struct acpi_namespace_node *)
305 gpe_device);
306 if (!obj_desc || !obj_desc->device.gpe_block) {
307 return (NULL);
308 }
309
310 return (acpi_ev_low_get_gpe_info
311 (gpe_number, obj_desc->device.gpe_block));
312 }
313
314 /*******************************************************************************
315 *
316 * FUNCTION: acpi_ev_gpe_detect
317 *
318 * PARAMETERS: gpe_xrupt_list - Interrupt block for this interrupt.
319 * Can have multiple GPE blocks attached.
320 *
321 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
322 *
323 * DESCRIPTION: Detect if any GP events have occurred. This function is
324 * executed at interrupt level.
325 *
326 ******************************************************************************/
327
328 u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info *gpe_xrupt_list)
329 {
330 acpi_status status;
331 struct acpi_gpe_block_info *gpe_block;
332 struct acpi_namespace_node *gpe_device;
333 struct acpi_gpe_register_info *gpe_register_info;
334 struct acpi_gpe_event_info *gpe_event_info;
335 u32 gpe_number;
336 struct acpi_gpe_handler_info *gpe_handler_info;
337 u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
338 u8 enabled_status_byte;
339 u32 status_reg;
340 u32 enable_reg;
341 acpi_cpu_flags flags;
342 u32 i;
343 u32 j;
344
345 ACPI_FUNCTION_NAME(ev_gpe_detect);
346
347 /* Check for the case where there are no GPEs */
348
349 if (!gpe_xrupt_list) {
350 return (int_status);
351 }
352
353 /*
354 * We need to obtain the GPE lock for both the data structs and registers
355 * Note: Not necessary to obtain the hardware lock, since the GPE
356 * registers are owned by the gpe_lock.
357 */
358 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
359
360 /* Examine all GPE blocks attached to this interrupt level */
361
362 gpe_block = gpe_xrupt_list->gpe_block_list_head;
363 while (gpe_block) {
364 gpe_device = gpe_block->node;
365
366 /*
367 * Read all of the 8-bit GPE status and enable registers in this GPE
368 * block, saving all of them. Find all currently active GP events.
369 */
370 for (i = 0; i < gpe_block->register_count; i++) {
371
372 /* Get the next status/enable pair */
373
374 gpe_register_info = &gpe_block->register_info[i];
375
376 /*
377 * Optimization: If there are no GPEs enabled within this
378 * register, we can safely ignore the entire register.
379 */
380 if (!(gpe_register_info->enable_for_run |
381 gpe_register_info->enable_for_wake)) {
382 ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
383 "Ignore disabled registers for GPE %02X-%02X: "
384 "RunEnable=%02X, WakeEnable=%02X\n",
385 gpe_register_info->
386 base_gpe_number,
387 gpe_register_info->
388 base_gpe_number +
389 (ACPI_GPE_REGISTER_WIDTH - 1),
390 gpe_register_info->
391 enable_for_run,
392 gpe_register_info->
393 enable_for_wake));
394 continue;
395 }
396
397 /* Read the Status Register */
398
399 status =
400 acpi_hw_read(&status_reg,
401 &gpe_register_info->status_address);
402 if (ACPI_FAILURE(status)) {
403 goto unlock_and_exit;
404 }
405
406 /* Read the Enable Register */
407
408 status =
409 acpi_hw_read(&enable_reg,
410 &gpe_register_info->enable_address);
411 if (ACPI_FAILURE(status)) {
412 goto unlock_and_exit;
413 }
414
415 ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
416 "Read registers for GPE %02X-%02X: Status=%02X, Enable=%02X, "
417 "RunEnable=%02X, WakeEnable=%02X\n",
418 gpe_register_info->base_gpe_number,
419 gpe_register_info->base_gpe_number +
420 (ACPI_GPE_REGISTER_WIDTH - 1),
421 status_reg, enable_reg,
422 gpe_register_info->enable_for_run,
423 gpe_register_info->enable_for_wake));
424
425 /* Check if there is anything active at all in this register */
426
427 enabled_status_byte = (u8)(status_reg & enable_reg);
428 if (!enabled_status_byte) {
429
430 /* No active GPEs in this register, move on */
431
432 continue;
433 }
434
435 /* Now look at the individual GPEs in this byte register */
436
437 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
438
439 /* Examine one GPE bit */
440
441 gpe_event_info =
442 &gpe_block->
443 event_info[((acpi_size)i *
444 ACPI_GPE_REGISTER_WIDTH) + j];
445 gpe_number =
446 j + gpe_register_info->base_gpe_number;
447
448 if (enabled_status_byte & (1 << j)) {
449
450 /* Invoke global event handler if present */
451
452 acpi_gpe_count++;
453 if (acpi_gbl_global_event_handler) {
454 acpi_gbl_global_event_handler
455 (ACPI_EVENT_TYPE_GPE,
456 gpe_device, gpe_number,
457 acpi_gbl_global_event_handler_context);
458 }
459
460 /* Found an active GPE */
461
462 if (ACPI_GPE_DISPATCH_TYPE
463 (gpe_event_info->flags) ==
464 ACPI_GPE_DISPATCH_RAW_HANDLER) {
465
466 /* Dispatch the event to a raw handler */
467
468 gpe_handler_info =
469 gpe_event_info->dispatch.
470 handler;
471
472 /*
473 * There is no protection around the namespace node
474 * and the GPE handler to ensure a safe destruction
475 * because:
476 * 1. The namespace node is expected to always
477 * exist after loading a table.
478 * 2. The GPE handler is expected to be flushed by
479 * acpi_os_wait_events_complete() before the
480 * destruction.
481 */
482 acpi_os_release_lock
483 (acpi_gbl_gpe_lock, flags);
484 int_status |=
485 gpe_handler_info->
486 address(gpe_device,
487 gpe_number,
488 gpe_handler_info->
489 context);
490 flags =
491 acpi_os_acquire_lock
492 (acpi_gbl_gpe_lock);
493 } else {
494 /*
495 * Dispatch the event to a standard handler or
496 * method.
497 */
498 int_status |=
499 acpi_ev_gpe_dispatch
500 (gpe_device, gpe_event_info,
501 gpe_number);
502 }
503 }
504 }
505 }
506
507 gpe_block = gpe_block->next;
508 }
509
510 unlock_and_exit:
511
512 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
513 return (int_status);
514 }
515
516 /*******************************************************************************
517 *
518 * FUNCTION: acpi_ev_asynch_execute_gpe_method
519 *
520 * PARAMETERS: Context (gpe_event_info) - Info for this GPE
521 *
522 * RETURN: None
523 *
524 * DESCRIPTION: Perform the actual execution of a GPE control method. This
525 * function is called from an invocation of acpi_os_execute and
526 * therefore does NOT execute at interrupt level - so that
527 * the control method itself is not executed in the context of
528 * an interrupt handler.
529 *
530 ******************************************************************************/
531
532 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context)
533 {
534 struct acpi_gpe_event_info *gpe_event_info = context;
535 acpi_status status = AE_OK;
536 struct acpi_evaluate_info *info;
537 struct acpi_gpe_notify_info *notify;
538
539 ACPI_FUNCTION_TRACE(ev_asynch_execute_gpe_method);
540
541 /* Do the correct dispatch - normal method or implicit notify */
542
543 switch (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags)) {
544 case ACPI_GPE_DISPATCH_NOTIFY:
545 /*
546 * Implicit notify.
547 * Dispatch a DEVICE_WAKE notify to the appropriate handler.
548 * NOTE: the request is queued for execution after this method
549 * completes. The notify handlers are NOT invoked synchronously
550 * from this thread -- because handlers may in turn run other
551 * control methods.
552 *
553 * June 2012: Expand implicit notify mechanism to support
554 * notifies on multiple device objects.
555 */
556 notify = gpe_event_info->dispatch.notify_list;
557 while (ACPI_SUCCESS(status) && notify) {
558 status =
559 acpi_ev_queue_notify_request(notify->device_node,
560 ACPI_NOTIFY_DEVICE_WAKE);
561
562 notify = notify->next;
563 }
564
565 break;
566
567 case ACPI_GPE_DISPATCH_METHOD:
568
569 /* Allocate the evaluation information block */
570
571 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
572 if (!info) {
573 status = AE_NO_MEMORY;
574 } else {
575 /*
576 * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the
577 * _Lxx/_Exx control method that corresponds to this GPE
578 */
579 info->prefix_node =
580 gpe_event_info->dispatch.method_node;
581 info->flags = ACPI_IGNORE_RETURN_VALUE;
582
583 status = acpi_ns_evaluate(info);
584 ACPI_FREE(info);
585 }
586
587 if (ACPI_FAILURE(status)) {
588 ACPI_EXCEPTION((AE_INFO, status,
589 "while evaluating GPE method [%4.4s]",
590 acpi_ut_get_node_name(gpe_event_info->
591 dispatch.
592 method_node)));
593 }
594 break;
595
596 default:
597
598 goto error_exit; /* Should never happen */
599 }
600
601 /* Defer enabling of GPE until all notify handlers are done */
602
603 status = acpi_os_execute(OSL_NOTIFY_HANDLER,
604 acpi_ev_asynch_enable_gpe, gpe_event_info);
605 if (ACPI_SUCCESS(status)) {
606 return_VOID;
607 }
608
609 error_exit:
610 acpi_ev_asynch_enable_gpe(gpe_event_info);
611 return_VOID;
612 }
613
614
615 /*******************************************************************************
616 *
617 * FUNCTION: acpi_ev_asynch_enable_gpe
618 *
619 * PARAMETERS: Context (gpe_event_info) - Info for this GPE
620 * Callback from acpi_os_execute
621 *
622 * RETURN: None
623 *
624 * DESCRIPTION: Asynchronous clear/enable for GPE. This allows the GPE to
625 * complete (i.e., finish execution of Notify)
626 *
627 ******************************************************************************/
628
629 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_enable_gpe(void *context)
630 {
631 struct acpi_gpe_event_info *gpe_event_info = context;
632 acpi_cpu_flags flags;
633
634 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
635 (void)acpi_ev_finish_gpe(gpe_event_info);
636 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
637
638 return;
639 }
640
641
642 /*******************************************************************************
643 *
644 * FUNCTION: acpi_ev_finish_gpe
645 *
646 * PARAMETERS: gpe_event_info - Info for this GPE
647 *
648 * RETURN: Status
649 *
650 * DESCRIPTION: Clear/Enable a GPE. Common code that is used after execution
651 * of a GPE method or a synchronous or asynchronous GPE handler.
652 *
653 ******************************************************************************/
654
655 acpi_status acpi_ev_finish_gpe(struct acpi_gpe_event_info *gpe_event_info)
656 {
657 acpi_status status;
658
659 if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
660 ACPI_GPE_LEVEL_TRIGGERED) {
661 /*
662 * GPE is level-triggered, we clear the GPE status bit after
663 * handling the event.
664 */
665 status = acpi_hw_clear_gpe(gpe_event_info);
666 if (ACPI_FAILURE(status)) {
667 return (status);
668 }
669 }
670
671 /*
672 * Enable this GPE, conditionally. This means that the GPE will
673 * only be physically enabled if the enable_mask bit is set
674 * in the event_info.
675 */
676 (void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_CONDITIONAL_ENABLE);
677 return (AE_OK);
678 }
679
680
681 /*******************************************************************************
682 *
683 * FUNCTION: acpi_ev_gpe_dispatch
684 *
685 * PARAMETERS: gpe_device - Device node. NULL for GPE0/GPE1
686 * gpe_event_info - Info for this GPE
687 * gpe_number - Number relative to the parent GPE block
688 *
689 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
690 *
691 * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
692 * or method (e.g. _Lxx/_Exx) handler.
693 *
694 * This function executes at interrupt level.
695 *
696 ******************************************************************************/
697
698 u32
699 acpi_ev_gpe_dispatch(struct acpi_namespace_node *gpe_device,
700 struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)
701 {
702 acpi_status status;
703 u32 return_value;
704
705 ACPI_FUNCTION_TRACE(ev_gpe_dispatch);
706
707 /*
708 * Always disable the GPE so that it does not keep firing before
709 * any asynchronous activity completes (either from the execution
710 * of a GPE method or an asynchronous GPE handler.)
711 *
712 * If there is no handler or method to run, just disable the
713 * GPE and leave it disabled permanently to prevent further such
714 * pointless events from firing.
715 */
716 status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);
717 if (ACPI_FAILURE(status)) {
718 ACPI_EXCEPTION((AE_INFO, status,
719 "Unable to disable GPE %02X", gpe_number));
720 return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
721 }
722
723 /*
724 * If edge-triggered, clear the GPE status bit now. Note that
725 * level-triggered events are cleared after the GPE is serviced.
726 */
727 if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
728 ACPI_GPE_EDGE_TRIGGERED) {
729 status = acpi_hw_clear_gpe(gpe_event_info);
730 if (ACPI_FAILURE(status)) {
731 ACPI_EXCEPTION((AE_INFO, status,
732 "Unable to clear GPE %02X",
733 gpe_number));
734 (void)acpi_hw_low_set_gpe(gpe_event_info,
735 ACPI_GPE_CONDITIONAL_ENABLE);
736 return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
737 }
738 }
739
740 /*
741 * Dispatch the GPE to either an installed handler or the control
742 * method associated with this GPE (_Lxx or _Exx). If a handler
743 * exists, we invoke it and do not attempt to run the method.
744 * If there is neither a handler nor a method, leave the GPE
745 * disabled.
746 */
747 switch (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags)) {
748 case ACPI_GPE_DISPATCH_HANDLER:
749
750 /* Invoke the installed handler (at interrupt level) */
751
752 return_value =
753 gpe_event_info->dispatch.handler->address(gpe_device,
754 gpe_number,
755 gpe_event_info->
756 dispatch.handler->
757 context);
758
759 /* If requested, clear (if level-triggered) and reenable the GPE */
760
761 if (return_value & ACPI_REENABLE_GPE) {
762 (void)acpi_ev_finish_gpe(gpe_event_info);
763 }
764 break;
765
766 case ACPI_GPE_DISPATCH_METHOD:
767 case ACPI_GPE_DISPATCH_NOTIFY:
768 /*
769 * Execute the method associated with the GPE
770 * NOTE: Level-triggered GPEs are cleared after the method completes.
771 */
772 status = acpi_os_execute(OSL_GPE_HANDLER,
773 acpi_ev_asynch_execute_gpe_method,
774 gpe_event_info);
775 if (ACPI_FAILURE(status)) {
776 ACPI_EXCEPTION((AE_INFO, status,
777 "Unable to queue handler for GPE %02X - event disabled",
778 gpe_number));
779 }
780 break;
781
782 default:
783 /*
784 * No handler or method to run!
785 * 03/2010: This case should no longer be possible. We will not allow
786 * a GPE to be enabled if it has no handler or method.
787 */
788 ACPI_ERROR((AE_INFO,
789 "No handler or method for GPE %02X, disabling event",
790 gpe_number));
791
792 break;
793 }
794
795 return_UINT32(ACPI_INTERRUPT_HANDLED);
796 }
797
798 #endif /* !ACPI_REDUCED_HARDWARE */
Linux with added FPC-III support