1 /******************************************************************************
3 * Module Name: evxface - External interfaces for ACPI events
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2011, Intel Corp.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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.
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.
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
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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.
44 #include <linux/export.h>
45 #include <acpi/acpi.h>
51 #define _COMPONENT ACPI_EVENTS
52 ACPI_MODULE_NAME("evxface")
54 /*******************************************************************************
56 * FUNCTION: acpi_install_exception_handler
58 * PARAMETERS: Handler - Pointer to the handler function for the
63 * DESCRIPTION: Saves the pointer to the handler function
65 ******************************************************************************/
66 #ifdef ACPI_FUTURE_USAGE
67 acpi_status acpi_install_exception_handler(acpi_exception_handler handler)
71 ACPI_FUNCTION_TRACE(acpi_install_exception_handler);
73 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
74 if (ACPI_FAILURE(status)) {
75 return_ACPI_STATUS(status);
78 /* Don't allow two handlers. */
80 if (acpi_gbl_exception_handler) {
81 status = AE_ALREADY_EXISTS;
85 /* Install the handler */
87 acpi_gbl_exception_handler = handler;
90 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
91 return_ACPI_STATUS(status);
94 ACPI_EXPORT_SYMBOL(acpi_install_exception_handler)
95 #endif /* ACPI_FUTURE_USAGE */
97 /*******************************************************************************
99 * FUNCTION: acpi_install_global_event_handler
101 * PARAMETERS: Handler - Pointer to the global event handler function
102 * Context - Value passed to the handler on each event
106 * DESCRIPTION: Saves the pointer to the handler function. The global handler
107 * is invoked upon each incoming GPE and Fixed Event. It is
108 * invoked at interrupt level at the time of the event dispatch.
109 * Can be used to update event counters, etc.
111 ******************************************************************************/
113 acpi_install_global_event_handler(ACPI_GBL_EVENT_HANDLER handler, void *context)
117 ACPI_FUNCTION_TRACE(acpi_install_global_event_handler);
119 /* Parameter validation */
122 return_ACPI_STATUS(AE_BAD_PARAMETER);
125 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
126 if (ACPI_FAILURE(status)) {
127 return_ACPI_STATUS(status);
130 /* Don't allow two handlers. */
132 if (acpi_gbl_global_event_handler) {
133 status = AE_ALREADY_EXISTS;
137 acpi_gbl_global_event_handler = handler;
138 acpi_gbl_global_event_handler_context = context;
141 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
142 return_ACPI_STATUS(status);
145 ACPI_EXPORT_SYMBOL(acpi_install_global_event_handler)
147 /*******************************************************************************
149 * FUNCTION: acpi_install_fixed_event_handler
151 * PARAMETERS: Event - Event type to enable.
152 * Handler - Pointer to the handler function for the
154 * Context - Value passed to the handler on each GPE
158 * DESCRIPTION: Saves the pointer to the handler function and then enables the
161 ******************************************************************************/
163 acpi_install_fixed_event_handler(u32 event,
164 acpi_event_handler handler, void *context)
168 ACPI_FUNCTION_TRACE(acpi_install_fixed_event_handler);
170 /* Parameter validation */
172 if (event > ACPI_EVENT_MAX) {
173 return_ACPI_STATUS(AE_BAD_PARAMETER);
176 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
177 if (ACPI_FAILURE(status)) {
178 return_ACPI_STATUS(status);
181 /* Don't allow two handlers. */
183 if (NULL != acpi_gbl_fixed_event_handlers[event].handler) {
184 status = AE_ALREADY_EXISTS;
188 /* Install the handler before enabling the event */
190 acpi_gbl_fixed_event_handlers[event].handler = handler;
191 acpi_gbl_fixed_event_handlers[event].context = context;
193 status = acpi_clear_event(event);
194 if (ACPI_SUCCESS(status))
195 status = acpi_enable_event(event, 0);
196 if (ACPI_FAILURE(status)) {
197 ACPI_WARNING((AE_INFO, "Could not enable fixed event 0x%X",
200 /* Remove the handler */
202 acpi_gbl_fixed_event_handlers[event].handler = NULL;
203 acpi_gbl_fixed_event_handlers[event].context = NULL;
205 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
206 "Enabled fixed event %X, Handler=%p\n", event,
211 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
212 return_ACPI_STATUS(status);
215 ACPI_EXPORT_SYMBOL(acpi_install_fixed_event_handler)
217 /*******************************************************************************
219 * FUNCTION: acpi_remove_fixed_event_handler
221 * PARAMETERS: Event - Event type to disable.
222 * Handler - Address of the handler
226 * DESCRIPTION: Disables the event and unregisters the event handler.
228 ******************************************************************************/
230 acpi_remove_fixed_event_handler(u32 event, acpi_event_handler handler)
232 acpi_status status = AE_OK;
234 ACPI_FUNCTION_TRACE(acpi_remove_fixed_event_handler);
236 /* Parameter validation */
238 if (event > ACPI_EVENT_MAX) {
239 return_ACPI_STATUS(AE_BAD_PARAMETER);
242 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
243 if (ACPI_FAILURE(status)) {
244 return_ACPI_STATUS(status);
247 /* Disable the event before removing the handler */
249 status = acpi_disable_event(event, 0);
251 /* Always Remove the handler */
253 acpi_gbl_fixed_event_handlers[event].handler = NULL;
254 acpi_gbl_fixed_event_handlers[event].context = NULL;
256 if (ACPI_FAILURE(status)) {
257 ACPI_WARNING((AE_INFO,
258 "Could not write to fixed event enable register 0x%X",
261 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Disabled fixed event %X\n",
265 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
266 return_ACPI_STATUS(status);
269 ACPI_EXPORT_SYMBOL(acpi_remove_fixed_event_handler)
271 /*******************************************************************************
273 * FUNCTION: acpi_populate_handler_object
275 * PARAMETERS: handler_obj - Handler object to populate
276 * handler_type - The type of handler:
277 * ACPI_SYSTEM_NOTIFY: system_handler (00-7f)
278 * ACPI_DEVICE_NOTIFY: driver_handler (80-ff)
279 * ACPI_ALL_NOTIFY: both system and device
280 * handler - Address of the handler
281 * context - Value passed to the handler on each GPE
282 * next - Address of a handler object to link to
286 * DESCRIPTION: Populate a handler object.
288 ******************************************************************************/
290 acpi_populate_handler_object(struct acpi_object_notify_handler *handler_obj,
292 acpi_notify_handler handler, void *context,
293 struct acpi_object_notify_handler *next)
295 handler_obj->handler_type = handler_type;
296 handler_obj->handler = handler;
297 handler_obj->context = context;
298 handler_obj->next = next;
301 /*******************************************************************************
303 * FUNCTION: acpi_add_handler_object
305 * PARAMETERS: parent_obj - Parent of the new object
306 * handler - Address of the handler
307 * context - Value passed to the handler on each GPE
311 * DESCRIPTION: Create a new handler object and populate it.
313 ******************************************************************************/
315 acpi_add_handler_object(struct acpi_object_notify_handler *parent_obj,
316 acpi_notify_handler handler, void *context)
318 struct acpi_object_notify_handler *handler_obj;
320 /* The parent must not be a defice notify handler object. */
321 if (parent_obj->handler_type & ACPI_DEVICE_NOTIFY)
322 return AE_BAD_PARAMETER;
324 handler_obj = ACPI_ALLOCATE_ZEROED(sizeof(*handler_obj));
328 acpi_populate_handler_object(handler_obj,
332 parent_obj->next = handler_obj;
337 /*******************************************************************************
339 * FUNCTION: acpi_install_notify_handler
341 * PARAMETERS: Device - The device for which notifies will be handled
342 * handler_type - The type of handler:
343 * ACPI_SYSTEM_NOTIFY: system_handler (00-7f)
344 * ACPI_DEVICE_NOTIFY: driver_handler (80-ff)
345 * ACPI_ALL_NOTIFY: both system and device
346 * Handler - Address of the handler
347 * Context - Value passed to the handler on each GPE
351 * DESCRIPTION: Install a handler for notifies on an ACPI device
353 ******************************************************************************/
355 acpi_install_notify_handler(acpi_handle device,
357 acpi_notify_handler handler, void *context)
359 union acpi_operand_object *obj_desc;
360 union acpi_operand_object *notify_obj;
361 struct acpi_namespace_node *node;
364 ACPI_FUNCTION_TRACE(acpi_install_notify_handler);
366 /* Parameter validation */
369 (!handler) || (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
370 return_ACPI_STATUS(AE_BAD_PARAMETER);
373 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
374 if (ACPI_FAILURE(status)) {
375 return_ACPI_STATUS(status);
378 /* Convert and validate the device handle */
380 node = acpi_ns_validate_handle(device);
382 status = AE_BAD_PARAMETER;
383 goto unlock_and_exit;
388 * Registering a notify handler on the root object indicates that the
389 * caller wishes to receive notifications for all objects. Note that
390 * only one <external> global handler can be regsitered (per notify type).
392 if (device == ACPI_ROOT_OBJECT) {
394 /* Make sure the handler is not already installed */
396 if (((handler_type & ACPI_SYSTEM_NOTIFY) &&
397 acpi_gbl_system_notify.handler) ||
398 ((handler_type & ACPI_DEVICE_NOTIFY) &&
399 acpi_gbl_device_notify.handler)) {
400 status = AE_ALREADY_EXISTS;
401 goto unlock_and_exit;
404 if (handler_type & ACPI_SYSTEM_NOTIFY) {
405 acpi_gbl_system_notify.node = node;
406 acpi_gbl_system_notify.handler = handler;
407 acpi_gbl_system_notify.context = context;
410 if (handler_type & ACPI_DEVICE_NOTIFY) {
411 acpi_gbl_device_notify.node = node;
412 acpi_gbl_device_notify.handler = handler;
413 acpi_gbl_device_notify.context = context;
416 /* Global notify handler installed */
421 * Caller will only receive notifications specific to the target object.
422 * Note that only certain object types can receive notifications.
425 /* Notifies allowed on this object? */
427 if (!acpi_ev_is_notify_object(node)) {
429 goto unlock_and_exit;
432 /* Check for an existing internal object */
434 obj_desc = acpi_ns_get_attached_object(node);
439 /* For a device notify, make sure there's no handler. */
440 if ((handler_type & ACPI_DEVICE_NOTIFY) &&
441 obj_desc->common_notify.device_notify) {
442 status = AE_ALREADY_EXISTS;
443 goto unlock_and_exit;
446 /* System notifies may have more handlers installed. */
447 notify_obj = obj_desc->common_notify.system_notify;
449 if ((handler_type & ACPI_SYSTEM_NOTIFY) && notify_obj) {
450 struct acpi_object_notify_handler *parent_obj;
452 if (handler_type & ACPI_DEVICE_NOTIFY) {
453 status = AE_ALREADY_EXISTS;
454 goto unlock_and_exit;
457 parent_obj = ¬ify_obj->notify;
458 status = acpi_add_handler_object(parent_obj,
461 goto unlock_and_exit;
464 /* Create a new object */
466 obj_desc = acpi_ut_create_internal_object(node->type);
468 status = AE_NO_MEMORY;
469 goto unlock_and_exit;
472 /* Attach new object to the Node */
475 acpi_ns_attach_object(device, obj_desc, node->type);
477 /* Remove local reference to the object */
479 acpi_ut_remove_reference(obj_desc);
480 if (ACPI_FAILURE(status)) {
481 goto unlock_and_exit;
485 /* Install the handler */
488 acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_NOTIFY);
490 status = AE_NO_MEMORY;
491 goto unlock_and_exit;
494 acpi_populate_handler_object(¬ify_obj->notify,
499 if (handler_type & ACPI_SYSTEM_NOTIFY) {
500 obj_desc->common_notify.system_notify = notify_obj;
503 if (handler_type & ACPI_DEVICE_NOTIFY) {
504 obj_desc->common_notify.device_notify = notify_obj;
507 if (handler_type == ACPI_ALL_NOTIFY) {
509 /* Extra ref if installed in both */
511 acpi_ut_add_reference(notify_obj);
516 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
517 return_ACPI_STATUS(status);
520 ACPI_EXPORT_SYMBOL(acpi_install_notify_handler)
522 /*******************************************************************************
524 * FUNCTION: acpi_remove_notify_handler
526 * PARAMETERS: Device - The device for which notifies will be handled
527 * handler_type - The type of handler:
528 * ACPI_SYSTEM_NOTIFY: system_handler (00-7f)
529 * ACPI_DEVICE_NOTIFY: driver_handler (80-ff)
530 * ACPI_ALL_NOTIFY: both system and device
531 * Handler - Address of the handler
535 * DESCRIPTION: Remove a handler for notifies on an ACPI device
537 ******************************************************************************/
539 acpi_remove_notify_handler(acpi_handle device,
540 u32 handler_type, acpi_notify_handler handler)
542 union acpi_operand_object *notify_obj;
543 union acpi_operand_object *obj_desc;
544 struct acpi_namespace_node *node;
547 ACPI_FUNCTION_TRACE(acpi_remove_notify_handler);
549 /* Parameter validation */
552 (!handler) || (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
553 status = AE_BAD_PARAMETER;
558 /* Make sure all deferred tasks are completed */
559 acpi_os_wait_events_complete(NULL);
561 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
562 if (ACPI_FAILURE(status)) {
566 /* Convert and validate the device handle */
568 node = acpi_ns_validate_handle(device);
570 status = AE_BAD_PARAMETER;
571 goto unlock_and_exit;
576 if (device == ACPI_ROOT_OBJECT) {
577 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
578 "Removing notify handler for namespace root object\n"));
580 if (((handler_type & ACPI_SYSTEM_NOTIFY) &&
581 !acpi_gbl_system_notify.handler) ||
582 ((handler_type & ACPI_DEVICE_NOTIFY) &&
583 !acpi_gbl_device_notify.handler)) {
584 status = AE_NOT_EXIST;
585 goto unlock_and_exit;
588 if (handler_type & ACPI_SYSTEM_NOTIFY) {
589 acpi_gbl_system_notify.node = NULL;
590 acpi_gbl_system_notify.handler = NULL;
591 acpi_gbl_system_notify.context = NULL;
594 if (handler_type & ACPI_DEVICE_NOTIFY) {
595 acpi_gbl_device_notify.node = NULL;
596 acpi_gbl_device_notify.handler = NULL;
597 acpi_gbl_device_notify.context = NULL;
601 /* All Other Objects */
604 /* Notifies allowed on this object? */
606 if (!acpi_ev_is_notify_object(node)) {
608 goto unlock_and_exit;
611 /* Check for an existing internal object */
613 obj_desc = acpi_ns_get_attached_object(node);
615 status = AE_NOT_EXIST;
616 goto unlock_and_exit;
619 /* Object exists - make sure there's an existing handler */
621 if (handler_type & ACPI_SYSTEM_NOTIFY) {
622 struct acpi_object_notify_handler *handler_obj;
623 struct acpi_object_notify_handler *parent_obj;
625 notify_obj = obj_desc->common_notify.system_notify;
627 status = AE_NOT_EXIST;
628 goto unlock_and_exit;
631 handler_obj = ¬ify_obj->notify;
633 while (handler_obj->handler != handler) {
634 if (handler_obj->next) {
635 parent_obj = handler_obj;
636 handler_obj = handler_obj->next;
642 if (handler_obj->handler != handler) {
643 status = AE_BAD_PARAMETER;
644 goto unlock_and_exit;
648 * Remove the handler. There are three possible cases.
649 * First, we may need to remove a non-embedded object.
650 * Second, we may need to remove the embedded object's
651 * handler data, while non-embedded objects exist.
652 * Finally, we may need to remove the embedded object
653 * entirely along with its container.
656 /* Non-embedded object is being removed. */
657 parent_obj->next = handler_obj->next;
658 ACPI_FREE(handler_obj);
659 } else if (notify_obj->notify.next) {
661 * The handler matches the embedded object, but
662 * there are more handler objects in the list.
663 * Replace the embedded object's data with the
664 * first next object's data and remove that
667 parent_obj = ¬ify_obj->notify;
668 handler_obj = notify_obj->notify.next;
669 *parent_obj = *handler_obj;
670 ACPI_FREE(handler_obj);
672 /* No more handler objects in the list. */
673 obj_desc->common_notify.system_notify = NULL;
674 acpi_ut_remove_reference(notify_obj);
678 if (handler_type & ACPI_DEVICE_NOTIFY) {
679 notify_obj = obj_desc->common_notify.device_notify;
681 status = AE_NOT_EXIST;
682 goto unlock_and_exit;
685 if (notify_obj->notify.handler != handler) {
686 status = AE_BAD_PARAMETER;
687 goto unlock_and_exit;
690 /* Remove the handler */
691 obj_desc->common_notify.device_notify = NULL;
692 acpi_ut_remove_reference(notify_obj);
697 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
699 if (ACPI_FAILURE(status))
700 ACPI_EXCEPTION((AE_INFO, status, "Removing notify handler"));
701 return_ACPI_STATUS(status);
704 ACPI_EXPORT_SYMBOL(acpi_remove_notify_handler)
706 /*******************************************************************************
708 * FUNCTION: acpi_install_gpe_handler
710 * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT
712 * gpe_number - The GPE number within the GPE block
713 * Type - Whether this GPE should be treated as an
714 * edge- or level-triggered interrupt.
715 * Address - Address of the handler
716 * Context - Value passed to the handler on each GPE
720 * DESCRIPTION: Install a handler for a General Purpose Event.
722 ******************************************************************************/
724 acpi_install_gpe_handler(acpi_handle gpe_device,
726 u32 type, acpi_gpe_handler address, void *context)
728 struct acpi_gpe_event_info *gpe_event_info;
729 struct acpi_gpe_handler_info *handler;
731 acpi_cpu_flags flags;
733 ACPI_FUNCTION_TRACE(acpi_install_gpe_handler);
735 /* Parameter validation */
737 if ((!address) || (type & ~ACPI_GPE_XRUPT_TYPE_MASK)) {
738 return_ACPI_STATUS(AE_BAD_PARAMETER);
741 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
742 if (ACPI_FAILURE(status)) {
743 return_ACPI_STATUS(status);
746 /* Allocate memory for the handler object */
748 handler = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_handler_info));
750 status = AE_NO_MEMORY;
751 goto unlock_and_exit;
754 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
756 /* Ensure that we have a valid GPE number */
758 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
759 if (!gpe_event_info) {
760 status = AE_BAD_PARAMETER;
764 /* Make sure that there isn't a handler there already */
766 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
767 ACPI_GPE_DISPATCH_HANDLER) {
768 status = AE_ALREADY_EXISTS;
772 /* Allocate and init handler object */
774 handler->address = address;
775 handler->context = context;
776 handler->method_node = gpe_event_info->dispatch.method_node;
777 handler->original_flags = gpe_event_info->flags &
778 (ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
781 * If the GPE is associated with a method, it might have been enabled
782 * automatically during initialization, in which case it has to be
783 * disabled now to avoid spurious execution of the handler.
786 if ((handler->original_flags & ACPI_GPE_DISPATCH_METHOD)
787 && gpe_event_info->runtime_count) {
788 handler->originally_enabled = 1;
789 (void)acpi_ev_remove_gpe_reference(gpe_event_info);
792 /* Install the handler */
794 gpe_event_info->dispatch.handler = handler;
796 /* Setup up dispatch flags to indicate handler (vs. method) */
798 gpe_event_info->flags &=
799 ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
800 gpe_event_info->flags |= (u8) (type | ACPI_GPE_DISPATCH_HANDLER);
802 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
805 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
806 return_ACPI_STATUS(status);
809 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
811 goto unlock_and_exit;
814 ACPI_EXPORT_SYMBOL(acpi_install_gpe_handler)
816 /*******************************************************************************
818 * FUNCTION: acpi_remove_gpe_handler
820 * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT
822 * gpe_number - The event to remove a handler
823 * Address - Address of the handler
827 * DESCRIPTION: Remove a handler for a General Purpose acpi_event.
829 ******************************************************************************/
831 acpi_remove_gpe_handler(acpi_handle gpe_device,
832 u32 gpe_number, acpi_gpe_handler address)
834 struct acpi_gpe_event_info *gpe_event_info;
835 struct acpi_gpe_handler_info *handler;
837 acpi_cpu_flags flags;
839 ACPI_FUNCTION_TRACE(acpi_remove_gpe_handler);
841 /* Parameter validation */
844 return_ACPI_STATUS(AE_BAD_PARAMETER);
847 /* Make sure all deferred tasks are completed */
849 acpi_os_wait_events_complete(NULL);
851 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
852 if (ACPI_FAILURE(status)) {
853 return_ACPI_STATUS(status);
856 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
858 /* Ensure that we have a valid GPE number */
860 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
861 if (!gpe_event_info) {
862 status = AE_BAD_PARAMETER;
863 goto unlock_and_exit;
866 /* Make sure that a handler is indeed installed */
868 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) !=
869 ACPI_GPE_DISPATCH_HANDLER) {
870 status = AE_NOT_EXIST;
871 goto unlock_and_exit;
874 /* Make sure that the installed handler is the same */
876 if (gpe_event_info->dispatch.handler->address != address) {
877 status = AE_BAD_PARAMETER;
878 goto unlock_and_exit;
881 /* Remove the handler */
883 handler = gpe_event_info->dispatch.handler;
885 /* Restore Method node (if any), set dispatch flags */
887 gpe_event_info->dispatch.method_node = handler->method_node;
888 gpe_event_info->flags &=
889 ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
890 gpe_event_info->flags |= handler->original_flags;
893 * If the GPE was previously associated with a method and it was
894 * enabled, it should be enabled at this point to restore the
895 * post-initialization configuration.
898 if ((handler->original_flags & ACPI_GPE_DISPATCH_METHOD)
899 && handler->originally_enabled)
900 (void)acpi_ev_add_gpe_reference(gpe_event_info);
902 /* Now we can free the handler object */
907 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
909 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
910 return_ACPI_STATUS(status);
913 ACPI_EXPORT_SYMBOL(acpi_remove_gpe_handler)
915 /*******************************************************************************
917 * FUNCTION: acpi_acquire_global_lock
919 * PARAMETERS: Timeout - How long the caller is willing to wait
920 * Handle - Where the handle to the lock is returned
925 * DESCRIPTION: Acquire the ACPI Global Lock
927 * Note: Allows callers with the same thread ID to acquire the global lock
928 * multiple times. In other words, externally, the behavior of the global lock
929 * is identical to an AML mutex. On the first acquire, a new handle is
930 * returned. On any subsequent calls to acquire by the same thread, the same
931 * handle is returned.
933 ******************************************************************************/
934 acpi_status acpi_acquire_global_lock(u16 timeout, u32 * handle)
939 return (AE_BAD_PARAMETER);
942 /* Must lock interpreter to prevent race conditions */
944 acpi_ex_enter_interpreter();
946 status = acpi_ex_acquire_mutex_object(timeout,
947 acpi_gbl_global_lock_mutex,
948 acpi_os_get_thread_id());
950 if (ACPI_SUCCESS(status)) {
952 /* Return the global lock handle (updated in acpi_ev_acquire_global_lock) */
954 *handle = acpi_gbl_global_lock_handle;
957 acpi_ex_exit_interpreter();
961 ACPI_EXPORT_SYMBOL(acpi_acquire_global_lock)
963 /*******************************************************************************
965 * FUNCTION: acpi_release_global_lock
967 * PARAMETERS: Handle - Returned from acpi_acquire_global_lock
971 * DESCRIPTION: Release the ACPI Global Lock. The handle must be valid.
973 ******************************************************************************/
974 acpi_status acpi_release_global_lock(u32 handle)
978 if (!handle || (handle != acpi_gbl_global_lock_handle)) {
979 return (AE_NOT_ACQUIRED);
982 status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex);
986 ACPI_EXPORT_SYMBOL(acpi_release_global_lock)