1 /******************************************************************************
3 * Module Name: evxface - External interfaces for ACPI events
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2013, 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
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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")
55 /*******************************************************************************
57 * FUNCTION: acpi_install_notify_handler
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
69 * DESCRIPTION: Install a handler for notifications on an ACPI Device,
70 * thermal_zone, or Processor object.
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
77 ******************************************************************************/
79 acpi_install_notify_handler(acpi_handle device,
81 acpi_notify_handler handler, void *context)
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;
90 ACPI_FUNCTION_TRACE(acpi_install_notify_handler);
92 /* Parameter validation */
94 if ((!device) || (!handler) || (!handler_type) ||
95 (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
96 return_ACPI_STATUS(AE_BAD_PARAMETER);
99 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
100 if (ACPI_FAILURE(status)) {
101 return_ACPI_STATUS(status);
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.
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;
119 acpi_gbl_global_notify[i].handler = handler;
120 acpi_gbl_global_notify[i].context = context;
124 goto unlock_and_exit; /* Global notify handler installed, all done */
129 * Caller will only receive notifications specific to the target
130 * object. Note that only certain object types are allowed to
131 * receive notifications.
134 /* Are Notifies allowed on this object? */
136 if (!acpi_ev_is_notify_object(node)) {
138 goto unlock_and_exit;
141 /* Check for an existing internal object, might not exist */
143 obj_desc = acpi_ns_get_attached_object(node);
146 /* Create a new object */
148 obj_desc = acpi_ut_create_internal_object(node->type);
150 status = AE_NO_MEMORY;
151 goto unlock_and_exit;
154 /* Attach new object to the Node, remove local reference */
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;
163 /* Ensure that the handler is not already installed in the lists */
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;
174 handler_obj = handler_obj->notify.next[i];
179 /* Create and populate a new notify handler object */
181 handler_obj = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_NOTIFY);
183 status = AE_NO_MEMORY;
184 goto unlock_and_exit;
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;
192 /* Install the handler at the list head(s) */
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];
199 obj_desc->common_notify.notify_list[i] = handler_obj;
203 /* Add an extra reference if handler was installed in both lists */
205 if (handler_type == ACPI_ALL_NOTIFY) {
206 acpi_ut_add_reference(handler_obj);
210 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
211 return_ACPI_STATUS(status);
214 ACPI_EXPORT_SYMBOL(acpi_install_notify_handler)
216 /*******************************************************************************
218 * FUNCTION: acpi_remove_notify_handler
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
229 * DESCRIPTION: Remove a handler for notifies on an ACPI device
231 ******************************************************************************/
233 acpi_remove_notify_handler(acpi_handle device,
234 u32 handler_type, acpi_notify_handler handler)
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;
244 ACPI_FUNCTION_TRACE(acpi_remove_notify_handler);
246 /* Parameter validation */
248 if ((!device) || (!handler) || (!handler_type) ||
249 (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
250 return_ACPI_STATUS(AE_BAD_PARAMETER);
253 /* Make sure all deferred notify tasks are completed */
255 acpi_os_wait_events_complete();
257 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
258 if (ACPI_FAILURE(status)) {
259 return_ACPI_STATUS(status);
262 /* Root Object. Global handlers are removed here */
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 !=
270 status = AE_NOT_EXIST;
271 goto unlock_and_exit;
274 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
275 "Removing global notify handler\n"));
277 acpi_gbl_global_notify[i].handler = NULL;
278 acpi_gbl_global_notify[i].context = NULL;
282 goto unlock_and_exit;
285 /* All other objects: Are Notifies allowed on this object? */
287 if (!acpi_ev_is_notify_object(node)) {
289 goto unlock_and_exit;
292 /* Must have an existing internal object */
294 obj_desc = acpi_ns_get_attached_object(node);
296 status = AE_NOT_EXIST;
297 goto unlock_and_exit;
300 /* Internal object exists. Find the handler and remove it */
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;
307 /* Attempt to find the handler in the handler list */
309 while (handler_obj &&
310 (handler_obj->notify.handler != handler)) {
311 previous_handler_obj = handler_obj;
312 handler_obj = handler_obj->notify.next[i];
316 status = AE_NOT_EXIST;
317 goto unlock_and_exit;
320 /* Remove the handler object from the list */
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 */
327 obj_desc->common_notify.notify_list[i] =
328 handler_obj->notify.next[i];
331 acpi_ut_remove_reference(handler_obj);
336 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
337 return_ACPI_STATUS(status);
340 ACPI_EXPORT_SYMBOL(acpi_remove_notify_handler)
342 /*******************************************************************************
344 * FUNCTION: acpi_install_exception_handler
346 * PARAMETERS: handler - Pointer to the handler function for the
351 * DESCRIPTION: Saves the pointer to the handler function
353 ******************************************************************************/
354 #ifdef ACPI_FUTURE_USAGE
355 acpi_status acpi_install_exception_handler(acpi_exception_handler handler)
359 ACPI_FUNCTION_TRACE(acpi_install_exception_handler);
361 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
362 if (ACPI_FAILURE(status)) {
363 return_ACPI_STATUS(status);
366 /* Don't allow two handlers. */
368 if (acpi_gbl_exception_handler) {
369 status = AE_ALREADY_EXISTS;
373 /* Install the handler */
375 acpi_gbl_exception_handler = handler;
378 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
379 return_ACPI_STATUS(status);
382 ACPI_EXPORT_SYMBOL(acpi_install_exception_handler)
383 #endif /* ACPI_FUTURE_USAGE */
385 #if (!ACPI_REDUCED_HARDWARE)
386 /*******************************************************************************
388 * FUNCTION: acpi_install_global_event_handler
390 * PARAMETERS: handler - Pointer to the global event handler function
391 * context - Value passed to the handler on each event
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.
400 ******************************************************************************/
402 acpi_install_global_event_handler(acpi_gbl_event_handler handler, void *context)
406 ACPI_FUNCTION_TRACE(acpi_install_global_event_handler);
408 /* Parameter validation */
411 return_ACPI_STATUS(AE_BAD_PARAMETER);
414 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
415 if (ACPI_FAILURE(status)) {
416 return_ACPI_STATUS(status);
419 /* Don't allow two handlers. */
421 if (acpi_gbl_global_event_handler) {
422 status = AE_ALREADY_EXISTS;
426 acpi_gbl_global_event_handler = handler;
427 acpi_gbl_global_event_handler_context = context;
430 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
431 return_ACPI_STATUS(status);
434 ACPI_EXPORT_SYMBOL(acpi_install_global_event_handler)
436 /*******************************************************************************
438 * FUNCTION: acpi_install_fixed_event_handler
440 * PARAMETERS: event - Event type to enable.
441 * handler - Pointer to the handler function for the
443 * context - Value passed to the handler on each GPE
447 * DESCRIPTION: Saves the pointer to the handler function and then enables the
450 ******************************************************************************/
452 acpi_install_fixed_event_handler(u32 event,
453 acpi_event_handler handler, void *context)
457 ACPI_FUNCTION_TRACE(acpi_install_fixed_event_handler);
459 /* Parameter validation */
461 if (event > ACPI_EVENT_MAX) {
462 return_ACPI_STATUS(AE_BAD_PARAMETER);
465 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
466 if (ACPI_FAILURE(status)) {
467 return_ACPI_STATUS(status);
470 /* Don't allow two handlers. */
472 if (NULL != acpi_gbl_fixed_event_handlers[event].handler) {
473 status = AE_ALREADY_EXISTS;
477 /* Install the handler before enabling the event */
479 acpi_gbl_fixed_event_handlers[event].handler = handler;
480 acpi_gbl_fixed_event_handlers[event].context = context;
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",
489 /* Remove the handler */
491 acpi_gbl_fixed_event_handlers[event].handler = NULL;
492 acpi_gbl_fixed_event_handlers[event].context = NULL;
494 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
495 "Enabled fixed event %X, Handler=%p\n", event,
500 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
501 return_ACPI_STATUS(status);
504 ACPI_EXPORT_SYMBOL(acpi_install_fixed_event_handler)
506 /*******************************************************************************
508 * FUNCTION: acpi_remove_fixed_event_handler
510 * PARAMETERS: event - Event type to disable.
511 * handler - Address of the handler
515 * DESCRIPTION: Disables the event and unregisters the event handler.
517 ******************************************************************************/
519 acpi_remove_fixed_event_handler(u32 event, acpi_event_handler handler)
521 acpi_status status = AE_OK;
523 ACPI_FUNCTION_TRACE(acpi_remove_fixed_event_handler);
525 /* Parameter validation */
527 if (event > ACPI_EVENT_MAX) {
528 return_ACPI_STATUS(AE_BAD_PARAMETER);
531 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
532 if (ACPI_FAILURE(status)) {
533 return_ACPI_STATUS(status);
536 /* Disable the event before removing the handler */
538 status = acpi_disable_event(event, 0);
540 /* Always Remove the handler */
542 acpi_gbl_fixed_event_handlers[event].handler = NULL;
543 acpi_gbl_fixed_event_handlers[event].context = NULL;
545 if (ACPI_FAILURE(status)) {
546 ACPI_WARNING((AE_INFO,
547 "Could not write to fixed event enable register 0x%X",
550 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Disabled fixed event %X\n",
554 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
555 return_ACPI_STATUS(status);
558 ACPI_EXPORT_SYMBOL(acpi_remove_fixed_event_handler)
560 /*******************************************************************************
562 * FUNCTION: acpi_install_gpe_handler
564 * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT
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
574 * DESCRIPTION: Install a handler for a General Purpose Event.
576 ******************************************************************************/
578 acpi_install_gpe_handler(acpi_handle gpe_device,
580 u32 type, acpi_gpe_handler address, void *context)
582 struct acpi_gpe_event_info *gpe_event_info;
583 struct acpi_gpe_handler_info *handler;
585 acpi_cpu_flags flags;
587 ACPI_FUNCTION_TRACE(acpi_install_gpe_handler);
589 /* Parameter validation */
591 if ((!address) || (type & ~ACPI_GPE_XRUPT_TYPE_MASK)) {
592 return_ACPI_STATUS(AE_BAD_PARAMETER);
595 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
596 if (ACPI_FAILURE(status)) {
597 return_ACPI_STATUS(status);
600 /* Allocate and init handler object (before lock) */
602 handler = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_handler_info));
604 status = AE_NO_MEMORY;
605 goto unlock_and_exit;
608 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
610 /* Ensure that we have a valid GPE number */
612 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
613 if (!gpe_event_info) {
614 status = AE_BAD_PARAMETER;
618 /* Make sure that there isn't a handler there already */
620 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
621 ACPI_GPE_DISPATCH_HANDLER) {
622 status = AE_ALREADY_EXISTS;
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));
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.
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);
645 /* Install the handler */
647 gpe_event_info->dispatch.handler = handler;
649 /* Setup up dispatch flags to indicate handler (vs. method/notify) */
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);
655 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
658 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
659 return_ACPI_STATUS(status);
662 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
664 goto unlock_and_exit;
667 ACPI_EXPORT_SYMBOL(acpi_install_gpe_handler)
669 /*******************************************************************************
671 * FUNCTION: acpi_remove_gpe_handler
673 * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT
675 * gpe_number - The event to remove a handler
676 * address - Address of the handler
680 * DESCRIPTION: Remove a handler for a General Purpose acpi_event.
682 ******************************************************************************/
684 acpi_remove_gpe_handler(acpi_handle gpe_device,
685 u32 gpe_number, acpi_gpe_handler address)
687 struct acpi_gpe_event_info *gpe_event_info;
688 struct acpi_gpe_handler_info *handler;
690 acpi_cpu_flags flags;
692 ACPI_FUNCTION_TRACE(acpi_remove_gpe_handler);
694 /* Parameter validation */
697 return_ACPI_STATUS(AE_BAD_PARAMETER);
700 /* Make sure all deferred GPE tasks are completed */
702 acpi_os_wait_events_complete();
704 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
705 if (ACPI_FAILURE(status)) {
706 return_ACPI_STATUS(status);
709 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
711 /* Ensure that we have a valid GPE number */
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;
719 /* Make sure that a handler is indeed installed */
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;
727 /* Make sure that the installed handler is the same */
729 if (gpe_event_info->dispatch.handler->address != address) {
730 status = AE_BAD_PARAMETER;
731 goto unlock_and_exit;
734 /* Remove the handler */
736 handler = gpe_event_info->dispatch.handler;
738 /* Restore Method node (if any), set dispatch flags */
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;
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.
750 if ((handler->original_flags & ACPI_GPE_DISPATCH_METHOD) &&
751 handler->originally_enabled) {
752 (void)acpi_ev_add_gpe_reference(gpe_event_info);
755 /* Now we can free the handler object */
760 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
762 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
763 return_ACPI_STATUS(status);
766 ACPI_EXPORT_SYMBOL(acpi_remove_gpe_handler)
768 /*******************************************************************************
770 * FUNCTION: acpi_acquire_global_lock
772 * PARAMETERS: timeout - How long the caller is willing to wait
773 * handle - Where the handle to the lock is returned
778 * DESCRIPTION: Acquire the ACPI Global Lock
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.
786 ******************************************************************************/
787 acpi_status acpi_acquire_global_lock(u16 timeout, u32 * handle)
792 return (AE_BAD_PARAMETER);
795 /* Must lock interpreter to prevent race conditions */
797 acpi_ex_enter_interpreter();
799 status = acpi_ex_acquire_mutex_object(timeout,
800 acpi_gbl_global_lock_mutex,
801 acpi_os_get_thread_id());
803 if (ACPI_SUCCESS(status)) {
805 /* Return the global lock handle (updated in acpi_ev_acquire_global_lock) */
807 *handle = acpi_gbl_global_lock_handle;
810 acpi_ex_exit_interpreter();
814 ACPI_EXPORT_SYMBOL(acpi_acquire_global_lock)
816 /*******************************************************************************
818 * FUNCTION: acpi_release_global_lock
820 * PARAMETERS: handle - Returned from acpi_acquire_global_lock
824 * DESCRIPTION: Release the ACPI Global Lock. The handle must be valid.
826 ******************************************************************************/
827 acpi_status acpi_release_global_lock(u32 handle)
831 if (!handle || (handle != acpi_gbl_global_lock_handle)) {
832 return (AE_NOT_ACQUIRED);
835 status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex);
839 ACPI_EXPORT_SYMBOL(acpi_release_global_lock)
840 #endif /* !ACPI_REDUCED_HARDWARE */