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Merge tag 'disintegrate-fbdev-20121220' of git://git.infradead.org/users/dhowells...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / acpi / acpica / evxface.c
1 /******************************************************************************
2 *
3 * Module Name: evxface - External interfaces for ACPI events
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2013, 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 <linux/export.h>
45 #include <acpi/acpi.h>
46 #include "accommon.h"
47 #include "acnamesp.h"
48 #include "acevents.h"
49 #include "acinterp.h"
50
51 #define _COMPONENT ACPI_EVENTS
52 ACPI_MODULE_NAME("evxface")
53
54
55 /*******************************************************************************
56 *
57 * FUNCTION: acpi_install_notify_handler
58 *
59 * PARAMETERS: device - The device for which notifies will be handled
60 * handler_type - The type of handler:
61 * ACPI_SYSTEM_NOTIFY: System Handler (00-7F)
62 * ACPI_DEVICE_NOTIFY: Device Handler (80-FF)
63 * ACPI_ALL_NOTIFY: Both System and Device
64 * handler - Address of the handler
65 * context - Value passed to the handler on each GPE
66 *
67 * RETURN: Status
68 *
69 * DESCRIPTION: Install a handler for notifications on an ACPI Device,
70 * thermal_zone, or Processor object.
71 *
72 * NOTES: The Root namespace object may have only one handler for each
73 * type of notify (System/Device). Device/Thermal/Processor objects
74 * may have one device notify handler, and multiple system notify
75 * handlers.
76 *
77 ******************************************************************************/
78 acpi_status
79 acpi_install_notify_handler(acpi_handle device,
80 u32 handler_type,
81 acpi_notify_handler handler, void *context)
82 {
83 struct acpi_namespace_node *node =
84 ACPI_CAST_PTR(struct acpi_namespace_node, device);
85 union acpi_operand_object *obj_desc;
86 union acpi_operand_object *handler_obj;
87 acpi_status status;
88 u32 i;
89
90 ACPI_FUNCTION_TRACE(acpi_install_notify_handler);
91
92 /* Parameter validation */
93
94 if ((!device) || (!handler) || (!handler_type) ||
95 (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
96 return_ACPI_STATUS(AE_BAD_PARAMETER);
97 }
98
99 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
100 if (ACPI_FAILURE(status)) {
101 return_ACPI_STATUS(status);
102 }
103
104 /*
105 * Root Object:
106 * Registering a notify handler on the root object indicates that the
107 * caller wishes to receive notifications for all objects. Note that
108 * only one global handler can be registered per notify type.
109 * Ensure that a handler is not already installed.
110 */
111 if (device == ACPI_ROOT_OBJECT) {
112 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
113 if (handler_type & (i + 1)) {
114 if (acpi_gbl_global_notify[i].handler) {
115 status = AE_ALREADY_EXISTS;
116 goto unlock_and_exit;
117 }
118
119 acpi_gbl_global_notify[i].handler = handler;
120 acpi_gbl_global_notify[i].context = context;
121 }
122 }
123
124 goto unlock_and_exit; /* Global notify handler installed, all done */
125 }
126
127 /*
128 * All Other Objects:
129 * Caller will only receive notifications specific to the target
130 * object. Note that only certain object types are allowed to
131 * receive notifications.
132 */
133
134 /* Are Notifies allowed on this object? */
135
136 if (!acpi_ev_is_notify_object(node)) {
137 status = AE_TYPE;
138 goto unlock_and_exit;
139 }
140
141 /* Check for an existing internal object, might not exist */
142
143 obj_desc = acpi_ns_get_attached_object(node);
144 if (!obj_desc) {
145
146 /* Create a new object */
147
148 obj_desc = acpi_ut_create_internal_object(node->type);
149 if (!obj_desc) {
150 status = AE_NO_MEMORY;
151 goto unlock_and_exit;
152 }
153
154 /* Attach new object to the Node, remove local reference */
155
156 status = acpi_ns_attach_object(device, obj_desc, node->type);
157 acpi_ut_remove_reference(obj_desc);
158 if (ACPI_FAILURE(status)) {
159 goto unlock_and_exit;
160 }
161 }
162
163 /* Ensure that the handler is not already installed in the lists */
164
165 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
166 if (handler_type & (i + 1)) {
167 handler_obj = obj_desc->common_notify.notify_list[i];
168 while (handler_obj) {
169 if (handler_obj->notify.handler == handler) {
170 status = AE_ALREADY_EXISTS;
171 goto unlock_and_exit;
172 }
173
174 handler_obj = handler_obj->notify.next[i];
175 }
176 }
177 }
178
179 /* Create and populate a new notify handler object */
180
181 handler_obj = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_NOTIFY);
182 if (!handler_obj) {
183 status = AE_NO_MEMORY;
184 goto unlock_and_exit;
185 }
186
187 handler_obj->notify.node = node;
188 handler_obj->notify.handler_type = handler_type;
189 handler_obj->notify.handler = handler;
190 handler_obj->notify.context = context;
191
192 /* Install the handler at the list head(s) */
193
194 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
195 if (handler_type & (i + 1)) {
196 handler_obj->notify.next[i] =
197 obj_desc->common_notify.notify_list[i];
198
199 obj_desc->common_notify.notify_list[i] = handler_obj;
200 }
201 }
202
203 /* Add an extra reference if handler was installed in both lists */
204
205 if (handler_type == ACPI_ALL_NOTIFY) {
206 acpi_ut_add_reference(handler_obj);
207 }
208
209 unlock_and_exit:
210 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
211 return_ACPI_STATUS(status);
212 }
213
214 ACPI_EXPORT_SYMBOL(acpi_install_notify_handler)
215
216 /*******************************************************************************
217 *
218 * FUNCTION: acpi_remove_notify_handler
219 *
220 * PARAMETERS: device - The device for which the handler is installed
221 * handler_type - The type of handler:
222 * ACPI_SYSTEM_NOTIFY: System Handler (00-7F)
223 * ACPI_DEVICE_NOTIFY: Device Handler (80-FF)
224 * ACPI_ALL_NOTIFY: Both System and Device
225 * handler - Address of the handler
226 *
227 * RETURN: Status
228 *
229 * DESCRIPTION: Remove a handler for notifies on an ACPI device
230 *
231 ******************************************************************************/
232 acpi_status
233 acpi_remove_notify_handler(acpi_handle device,
234 u32 handler_type, acpi_notify_handler handler)
235 {
236 struct acpi_namespace_node *node =
237 ACPI_CAST_PTR(struct acpi_namespace_node, device);
238 union acpi_operand_object *obj_desc;
239 union acpi_operand_object *handler_obj;
240 union acpi_operand_object *previous_handler_obj;
241 acpi_status status;
242 u32 i;
243
244 ACPI_FUNCTION_TRACE(acpi_remove_notify_handler);
245
246 /* Parameter validation */
247
248 if ((!device) || (!handler) || (!handler_type) ||
249 (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
250 return_ACPI_STATUS(AE_BAD_PARAMETER);
251 }
252
253 /* Make sure all deferred notify tasks are completed */
254
255 acpi_os_wait_events_complete();
256
257 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
258 if (ACPI_FAILURE(status)) {
259 return_ACPI_STATUS(status);
260 }
261
262 /* Root Object. Global handlers are removed here */
263
264 if (device == ACPI_ROOT_OBJECT) {
265 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
266 if (handler_type & (i + 1)) {
267 if (!acpi_gbl_global_notify[i].handler ||
268 (acpi_gbl_global_notify[i].handler !=
269 handler)) {
270 status = AE_NOT_EXIST;
271 goto unlock_and_exit;
272 }
273
274 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
275 "Removing global notify handler\n"));
276
277 acpi_gbl_global_notify[i].handler = NULL;
278 acpi_gbl_global_notify[i].context = NULL;
279 }
280 }
281
282 goto unlock_and_exit;
283 }
284
285 /* All other objects: Are Notifies allowed on this object? */
286
287 if (!acpi_ev_is_notify_object(node)) {
288 status = AE_TYPE;
289 goto unlock_and_exit;
290 }
291
292 /* Must have an existing internal object */
293
294 obj_desc = acpi_ns_get_attached_object(node);
295 if (!obj_desc) {
296 status = AE_NOT_EXIST;
297 goto unlock_and_exit;
298 }
299
300 /* Internal object exists. Find the handler and remove it */
301
302 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
303 if (handler_type & (i + 1)) {
304 handler_obj = obj_desc->common_notify.notify_list[i];
305 previous_handler_obj = NULL;
306
307 /* Attempt to find the handler in the handler list */
308
309 while (handler_obj &&
310 (handler_obj->notify.handler != handler)) {
311 previous_handler_obj = handler_obj;
312 handler_obj = handler_obj->notify.next[i];
313 }
314
315 if (!handler_obj) {
316 status = AE_NOT_EXIST;
317 goto unlock_and_exit;
318 }
319
320 /* Remove the handler object from the list */
321
322 if (previous_handler_obj) { /* Handler is not at the list head */
323 previous_handler_obj->notify.next[i] =
324 handler_obj->notify.next[i];
325 } else { /* Handler is at the list head */
326
327 obj_desc->common_notify.notify_list[i] =
328 handler_obj->notify.next[i];
329 }
330
331 acpi_ut_remove_reference(handler_obj);
332 }
333 }
334
335 unlock_and_exit:
336 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
337 return_ACPI_STATUS(status);
338 }
339
340 ACPI_EXPORT_SYMBOL(acpi_remove_notify_handler)
341
342 /*******************************************************************************
343 *
344 * FUNCTION: acpi_install_exception_handler
345 *
346 * PARAMETERS: handler - Pointer to the handler function for the
347 * event
348 *
349 * RETURN: Status
350 *
351 * DESCRIPTION: Saves the pointer to the handler function
352 *
353 ******************************************************************************/
354 #ifdef ACPI_FUTURE_USAGE
355 acpi_status acpi_install_exception_handler(acpi_exception_handler handler)
356 {
357 acpi_status status;
358
359 ACPI_FUNCTION_TRACE(acpi_install_exception_handler);
360
361 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
362 if (ACPI_FAILURE(status)) {
363 return_ACPI_STATUS(status);
364 }
365
366 /* Don't allow two handlers. */
367
368 if (acpi_gbl_exception_handler) {
369 status = AE_ALREADY_EXISTS;
370 goto cleanup;
371 }
372
373 /* Install the handler */
374
375 acpi_gbl_exception_handler = handler;
376
377 cleanup:
378 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
379 return_ACPI_STATUS(status);
380 }
381
382 ACPI_EXPORT_SYMBOL(acpi_install_exception_handler)
383 #endif /* ACPI_FUTURE_USAGE */
384
385 #if (!ACPI_REDUCED_HARDWARE)
386 /*******************************************************************************
387 *
388 * FUNCTION: acpi_install_global_event_handler
389 *
390 * PARAMETERS: handler - Pointer to the global event handler function
391 * context - Value passed to the handler on each event
392 *
393 * RETURN: Status
394 *
395 * DESCRIPTION: Saves the pointer to the handler function. The global handler
396 * is invoked upon each incoming GPE and Fixed Event. It is
397 * invoked at interrupt level at the time of the event dispatch.
398 * Can be used to update event counters, etc.
399 *
400 ******************************************************************************/
401 acpi_status
402 acpi_install_global_event_handler(acpi_gbl_event_handler handler, void *context)
403 {
404 acpi_status status;
405
406 ACPI_FUNCTION_TRACE(acpi_install_global_event_handler);
407
408 /* Parameter validation */
409
410 if (!handler) {
411 return_ACPI_STATUS(AE_BAD_PARAMETER);
412 }
413
414 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
415 if (ACPI_FAILURE(status)) {
416 return_ACPI_STATUS(status);
417 }
418
419 /* Don't allow two handlers. */
420
421 if (acpi_gbl_global_event_handler) {
422 status = AE_ALREADY_EXISTS;
423 goto cleanup;
424 }
425
426 acpi_gbl_global_event_handler = handler;
427 acpi_gbl_global_event_handler_context = context;
428
429 cleanup:
430 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
431 return_ACPI_STATUS(status);
432 }
433
434 ACPI_EXPORT_SYMBOL(acpi_install_global_event_handler)
435
436 /*******************************************************************************
437 *
438 * FUNCTION: acpi_install_fixed_event_handler
439 *
440 * PARAMETERS: event - Event type to enable.
441 * handler - Pointer to the handler function for the
442 * event
443 * context - Value passed to the handler on each GPE
444 *
445 * RETURN: Status
446 *
447 * DESCRIPTION: Saves the pointer to the handler function and then enables the
448 * event.
449 *
450 ******************************************************************************/
451 acpi_status
452 acpi_install_fixed_event_handler(u32 event,
453 acpi_event_handler handler, void *context)
454 {
455 acpi_status status;
456
457 ACPI_FUNCTION_TRACE(acpi_install_fixed_event_handler);
458
459 /* Parameter validation */
460
461 if (event > ACPI_EVENT_MAX) {
462 return_ACPI_STATUS(AE_BAD_PARAMETER);
463 }
464
465 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
466 if (ACPI_FAILURE(status)) {
467 return_ACPI_STATUS(status);
468 }
469
470 /* Don't allow two handlers. */
471
472 if (NULL != acpi_gbl_fixed_event_handlers[event].handler) {
473 status = AE_ALREADY_EXISTS;
474 goto cleanup;
475 }
476
477 /* Install the handler before enabling the event */
478
479 acpi_gbl_fixed_event_handlers[event].handler = handler;
480 acpi_gbl_fixed_event_handlers[event].context = context;
481
482 status = acpi_clear_event(event);
483 if (ACPI_SUCCESS(status))
484 status = acpi_enable_event(event, 0);
485 if (ACPI_FAILURE(status)) {
486 ACPI_WARNING((AE_INFO, "Could not enable fixed event 0x%X",
487 event));
488
489 /* Remove the handler */
490
491 acpi_gbl_fixed_event_handlers[event].handler = NULL;
492 acpi_gbl_fixed_event_handlers[event].context = NULL;
493 } else {
494 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
495 "Enabled fixed event %X, Handler=%p\n", event,
496 handler));
497 }
498
499 cleanup:
500 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
501 return_ACPI_STATUS(status);
502 }
503
504 ACPI_EXPORT_SYMBOL(acpi_install_fixed_event_handler)
505
506 /*******************************************************************************
507 *
508 * FUNCTION: acpi_remove_fixed_event_handler
509 *
510 * PARAMETERS: event - Event type to disable.
511 * handler - Address of the handler
512 *
513 * RETURN: Status
514 *
515 * DESCRIPTION: Disables the event and unregisters the event handler.
516 *
517 ******************************************************************************/
518 acpi_status
519 acpi_remove_fixed_event_handler(u32 event, acpi_event_handler handler)
520 {
521 acpi_status status = AE_OK;
522
523 ACPI_FUNCTION_TRACE(acpi_remove_fixed_event_handler);
524
525 /* Parameter validation */
526
527 if (event > ACPI_EVENT_MAX) {
528 return_ACPI_STATUS(AE_BAD_PARAMETER);
529 }
530
531 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
532 if (ACPI_FAILURE(status)) {
533 return_ACPI_STATUS(status);
534 }
535
536 /* Disable the event before removing the handler */
537
538 status = acpi_disable_event(event, 0);
539
540 /* Always Remove the handler */
541
542 acpi_gbl_fixed_event_handlers[event].handler = NULL;
543 acpi_gbl_fixed_event_handlers[event].context = NULL;
544
545 if (ACPI_FAILURE(status)) {
546 ACPI_WARNING((AE_INFO,
547 "Could not write to fixed event enable register 0x%X",
548 event));
549 } else {
550 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Disabled fixed event %X\n",
551 event));
552 }
553
554 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
555 return_ACPI_STATUS(status);
556 }
557
558 ACPI_EXPORT_SYMBOL(acpi_remove_fixed_event_handler)
559
560 /*******************************************************************************
561 *
562 * FUNCTION: acpi_install_gpe_handler
563 *
564 * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT
565 * defined GPEs)
566 * gpe_number - The GPE number within the GPE block
567 * type - Whether this GPE should be treated as an
568 * edge- or level-triggered interrupt.
569 * address - Address of the handler
570 * context - Value passed to the handler on each GPE
571 *
572 * RETURN: Status
573 *
574 * DESCRIPTION: Install a handler for a General Purpose Event.
575 *
576 ******************************************************************************/
577 acpi_status
578 acpi_install_gpe_handler(acpi_handle gpe_device,
579 u32 gpe_number,
580 u32 type, acpi_gpe_handler address, void *context)
581 {
582 struct acpi_gpe_event_info *gpe_event_info;
583 struct acpi_gpe_handler_info *handler;
584 acpi_status status;
585 acpi_cpu_flags flags;
586
587 ACPI_FUNCTION_TRACE(acpi_install_gpe_handler);
588
589 /* Parameter validation */
590
591 if ((!address) || (type & ~ACPI_GPE_XRUPT_TYPE_MASK)) {
592 return_ACPI_STATUS(AE_BAD_PARAMETER);
593 }
594
595 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
596 if (ACPI_FAILURE(status)) {
597 return_ACPI_STATUS(status);
598 }
599
600 /* Allocate and init handler object (before lock) */
601
602 handler = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_handler_info));
603 if (!handler) {
604 status = AE_NO_MEMORY;
605 goto unlock_and_exit;
606 }
607
608 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
609
610 /* Ensure that we have a valid GPE number */
611
612 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
613 if (!gpe_event_info) {
614 status = AE_BAD_PARAMETER;
615 goto free_and_exit;
616 }
617
618 /* Make sure that there isn't a handler there already */
619
620 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
621 ACPI_GPE_DISPATCH_HANDLER) {
622 status = AE_ALREADY_EXISTS;
623 goto free_and_exit;
624 }
625
626 handler->address = address;
627 handler->context = context;
628 handler->method_node = gpe_event_info->dispatch.method_node;
629 handler->original_flags = (u8)(gpe_event_info->flags &
630 (ACPI_GPE_XRUPT_TYPE_MASK |
631 ACPI_GPE_DISPATCH_MASK));
632
633 /*
634 * If the GPE is associated with a method, it may have been enabled
635 * automatically during initialization, in which case it has to be
636 * disabled now to avoid spurious execution of the handler.
637 */
638
639 if ((handler->original_flags & ACPI_GPE_DISPATCH_METHOD)
640 && gpe_event_info->runtime_count) {
641 handler->originally_enabled = 1;
642 (void)acpi_ev_remove_gpe_reference(gpe_event_info);
643 }
644
645 /* Install the handler */
646
647 gpe_event_info->dispatch.handler = handler;
648
649 /* Setup up dispatch flags to indicate handler (vs. method/notify) */
650
651 gpe_event_info->flags &=
652 ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
653 gpe_event_info->flags |= (u8) (type | ACPI_GPE_DISPATCH_HANDLER);
654
655 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
656
657 unlock_and_exit:
658 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
659 return_ACPI_STATUS(status);
660
661 free_and_exit:
662 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
663 ACPI_FREE(handler);
664 goto unlock_and_exit;
665 }
666
667 ACPI_EXPORT_SYMBOL(acpi_install_gpe_handler)
668
669 /*******************************************************************************
670 *
671 * FUNCTION: acpi_remove_gpe_handler
672 *
673 * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT
674 * defined GPEs)
675 * gpe_number - The event to remove a handler
676 * address - Address of the handler
677 *
678 * RETURN: Status
679 *
680 * DESCRIPTION: Remove a handler for a General Purpose acpi_event.
681 *
682 ******************************************************************************/
683 acpi_status
684 acpi_remove_gpe_handler(acpi_handle gpe_device,
685 u32 gpe_number, acpi_gpe_handler address)
686 {
687 struct acpi_gpe_event_info *gpe_event_info;
688 struct acpi_gpe_handler_info *handler;
689 acpi_status status;
690 acpi_cpu_flags flags;
691
692 ACPI_FUNCTION_TRACE(acpi_remove_gpe_handler);
693
694 /* Parameter validation */
695
696 if (!address) {
697 return_ACPI_STATUS(AE_BAD_PARAMETER);
698 }
699
700 /* Make sure all deferred GPE tasks are completed */
701
702 acpi_os_wait_events_complete();
703
704 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
705 if (ACPI_FAILURE(status)) {
706 return_ACPI_STATUS(status);
707 }
708
709 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
710
711 /* Ensure that we have a valid GPE number */
712
713 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
714 if (!gpe_event_info) {
715 status = AE_BAD_PARAMETER;
716 goto unlock_and_exit;
717 }
718
719 /* Make sure that a handler is indeed installed */
720
721 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) !=
722 ACPI_GPE_DISPATCH_HANDLER) {
723 status = AE_NOT_EXIST;
724 goto unlock_and_exit;
725 }
726
727 /* Make sure that the installed handler is the same */
728
729 if (gpe_event_info->dispatch.handler->address != address) {
730 status = AE_BAD_PARAMETER;
731 goto unlock_and_exit;
732 }
733
734 /* Remove the handler */
735
736 handler = gpe_event_info->dispatch.handler;
737
738 /* Restore Method node (if any), set dispatch flags */
739
740 gpe_event_info->dispatch.method_node = handler->method_node;
741 gpe_event_info->flags &=
742 ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
743 gpe_event_info->flags |= handler->original_flags;
744
745 /*
746 * If the GPE was previously associated with a method and it was
747 * enabled, it should be enabled at this point to restore the
748 * post-initialization configuration.
749 */
750 if ((handler->original_flags & ACPI_GPE_DISPATCH_METHOD) &&
751 handler->originally_enabled) {
752 (void)acpi_ev_add_gpe_reference(gpe_event_info);
753 }
754
755 /* Now we can free the handler object */
756
757 ACPI_FREE(handler);
758
759 unlock_and_exit:
760 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
761
762 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
763 return_ACPI_STATUS(status);
764 }
765
766 ACPI_EXPORT_SYMBOL(acpi_remove_gpe_handler)
767
768 /*******************************************************************************
769 *
770 * FUNCTION: acpi_acquire_global_lock
771 *
772 * PARAMETERS: timeout - How long the caller is willing to wait
773 * handle - Where the handle to the lock is returned
774 * (if acquired)
775 *
776 * RETURN: Status
777 *
778 * DESCRIPTION: Acquire the ACPI Global Lock
779 *
780 * Note: Allows callers with the same thread ID to acquire the global lock
781 * multiple times. In other words, externally, the behavior of the global lock
782 * is identical to an AML mutex. On the first acquire, a new handle is
783 * returned. On any subsequent calls to acquire by the same thread, the same
784 * handle is returned.
785 *
786 ******************************************************************************/
787 acpi_status acpi_acquire_global_lock(u16 timeout, u32 * handle)
788 {
789 acpi_status status;
790
791 if (!handle) {
792 return (AE_BAD_PARAMETER);
793 }
794
795 /* Must lock interpreter to prevent race conditions */
796
797 acpi_ex_enter_interpreter();
798
799 status = acpi_ex_acquire_mutex_object(timeout,
800 acpi_gbl_global_lock_mutex,
801 acpi_os_get_thread_id());
802
803 if (ACPI_SUCCESS(status)) {
804
805 /* Return the global lock handle (updated in acpi_ev_acquire_global_lock) */
806
807 *handle = acpi_gbl_global_lock_handle;
808 }
809
810 acpi_ex_exit_interpreter();
811 return (status);
812 }
813
814 ACPI_EXPORT_SYMBOL(acpi_acquire_global_lock)
815
816 /*******************************************************************************
817 *
818 * FUNCTION: acpi_release_global_lock
819 *
820 * PARAMETERS: handle - Returned from acpi_acquire_global_lock
821 *
822 * RETURN: Status
823 *
824 * DESCRIPTION: Release the ACPI Global Lock. The handle must be valid.
825 *
826 ******************************************************************************/
827 acpi_status acpi_release_global_lock(u32 handle)
828 {
829 acpi_status status;
830
831 if (!handle || (handle != acpi_gbl_global_lock_handle)) {
832 return (AE_NOT_ACQUIRED);
833 }
834
835 status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex);
836 return (status);
837 }
838
839 ACPI_EXPORT_SYMBOL(acpi_release_global_lock)
840 #endif /* !ACPI_REDUCED_HARDWARE */
kernel source for telekom puls (alcatel/mediatek)