/****************************************************************************** * * Module Name: evxface - External interfaces for ACPI events * *****************************************************************************/ /* * Copyright (C) 2000 - 2012, Intel Corp. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions, and the following disclaimer, * without modification. * 2. Redistributions in binary form must reproduce at minimum a disclaimer * substantially similar to the "NO WARRANTY" disclaimer below * ("Disclaimer") and any redistribution must be conditioned upon * including a substantially similar Disclaimer requirement for further * binary redistribution. * 3. Neither the names of the above-listed copyright holders nor the names * of any contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * * NO WARRANTY * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGES. */ #include <linux/export.h> #include <acpi/acpi.h> #include "accommon.h" #include "acnamesp.h" #include "acevents.h" #include "acinterp.h" #define _COMPONENT ACPI_EVENTS ACPI_MODULE_NAME("evxface") /******************************************************************************* * * FUNCTION: acpi_install_exception_handler * * PARAMETERS: Handler - Pointer to the handler function for the * event * * RETURN: Status * * DESCRIPTION: Saves the pointer to the handler function * ******************************************************************************/ #ifdef ACPI_FUTURE_USAGE acpi_status acpi_install_exception_handler(acpi_exception_handler handler) { acpi_status status; ACPI_FUNCTION_TRACE(acpi_install_exception_handler); status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } /* Don't allow two handlers. */ if (acpi_gbl_exception_handler) { status = AE_ALREADY_EXISTS; goto cleanup; } /* Install the handler */ acpi_gbl_exception_handler = handler; cleanup: (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); return_ACPI_STATUS(status); } ACPI_EXPORT_SYMBOL(acpi_install_exception_handler) #endif /* ACPI_FUTURE_USAGE */ /******************************************************************************* * * FUNCTION: acpi_install_global_event_handler * * PARAMETERS: Handler - Pointer to the global event handler function * Context - Value passed to the handler on each event * * RETURN: Status * * DESCRIPTION: Saves the pointer to the handler function. The global handler * is invoked upon each incoming GPE and Fixed Event. It is * invoked at interrupt level at the time of the event dispatch. * Can be used to update event counters, etc. * ******************************************************************************/ acpi_status acpi_install_global_event_handler(ACPI_GBL_EVENT_HANDLER handler, void *context) { acpi_status status; ACPI_FUNCTION_TRACE(acpi_install_global_event_handler); /* Parameter validation */ if (!handler) { return_ACPI_STATUS(AE_BAD_PARAMETER); } status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } /* Don't allow two handlers. */ if (acpi_gbl_global_event_handler) { status = AE_ALREADY_EXISTS; goto cleanup; } acpi_gbl_global_event_handler = handler; acpi_gbl_global_event_handler_context = context; cleanup: (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); return_ACPI_STATUS(status); } ACPI_EXPORT_SYMBOL(acpi_install_global_event_handler) /******************************************************************************* * * FUNCTION: acpi_install_fixed_event_handler * * PARAMETERS: Event - Event type to enable. * Handler - Pointer to the handler function for the * event * Context - Value passed to the handler on each GPE * * RETURN: Status * * DESCRIPTION: Saves the pointer to the handler function and then enables the * event. * ******************************************************************************/ acpi_status acpi_install_fixed_event_handler(u32 event, acpi_event_handler handler, void *context) { acpi_status status; ACPI_FUNCTION_TRACE(acpi_install_fixed_event_handler); /* Parameter validation */ if (event > ACPI_EVENT_MAX) { return_ACPI_STATUS(AE_BAD_PARAMETER); } status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } /* Don't allow two handlers. */ if (NULL != acpi_gbl_fixed_event_handlers[event].handler) { status = AE_ALREADY_EXISTS; goto cleanup; } /* Install the handler before enabling the event */ acpi_gbl_fixed_event_handlers[event].handler = handler; acpi_gbl_fixed_event_handlers[event].context = context; status = acpi_clear_event(event); if (ACPI_SUCCESS(status)) status = acpi_enable_event(event, 0); if (ACPI_FAILURE(status)) { ACPI_WARNING((AE_INFO, "Could not enable fixed event 0x%X", event)); /* Remove the handler */ acpi_gbl_fixed_event_handlers[event].handler = NULL; acpi_gbl_fixed_event_handlers[event].context = NULL; } else { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Enabled fixed event %X, Handler=%p\n", event, handler)); } cleanup: (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); return_ACPI_STATUS(status); } ACPI_EXPORT_SYMBOL(acpi_install_fixed_event_handler) /******************************************************************************* * * FUNCTION: acpi_remove_fixed_event_handler * * PARAMETERS: Event - Event type to disable. * Handler - Address of the handler * * RETURN: Status * * DESCRIPTION: Disables the event and unregisters the event handler. * ******************************************************************************/ acpi_status acpi_remove_fixed_event_handler(u32 event, acpi_event_handler handler) { acpi_status status = AE_OK; ACPI_FUNCTION_TRACE(acpi_remove_fixed_event_handler); /* Parameter validation */ if (event > ACPI_EVENT_MAX) { return_ACPI_STATUS(AE_BAD_PARAMETER); } status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } /* Disable the event before removing the handler */ status = acpi_disable_event(event, 0); /* Always Remove the handler */ acpi_gbl_fixed_event_handlers[event].handler = NULL; acpi_gbl_fixed_event_handlers[event].context = NULL; if (ACPI_FAILURE(status)) { ACPI_WARNING((AE_INFO, "Could not write to fixed event enable register 0x%X", event)); } else { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Disabled fixed event %X\n", event)); } (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); return_ACPI_STATUS(status); } ACPI_EXPORT_SYMBOL(acpi_remove_fixed_event_handler) /******************************************************************************* * * FUNCTION: acpi_populate_handler_object * * PARAMETERS: handler_obj - Handler object to populate * handler_type - The type of handler: * ACPI_SYSTEM_NOTIFY: system_handler (00-7f) * ACPI_DEVICE_NOTIFY: driver_handler (80-ff) * ACPI_ALL_NOTIFY: both system and device * handler - Address of the handler * context - Value passed to the handler on each GPE * next - Address of a handler object to link to * * RETURN: None * * DESCRIPTION: Populate a handler object. * ******************************************************************************/ static void acpi_populate_handler_object(struct acpi_object_notify_handler *handler_obj, u32 handler_type, acpi_notify_handler handler, void *context, struct acpi_object_notify_handler *next) { handler_obj->handler_type = handler_type; handler_obj->handler = handler; handler_obj->context = context; handler_obj->next = next; } /******************************************************************************* * * FUNCTION: acpi_add_handler_object * * PARAMETERS: parent_obj - Parent of the new object * handler - Address of the handler * context - Value passed to the handler on each GPE * * RETURN: Status * * DESCRIPTION: Create a new handler object and populate it. * ******************************************************************************/ static acpi_status acpi_add_handler_object(struct acpi_object_notify_handler *parent_obj, acpi_notify_handler handler, void *context) { struct acpi_object_notify_handler *handler_obj; /* The parent must not be a defice notify handler object. */ if (parent_obj->handler_type & ACPI_DEVICE_NOTIFY) return AE_BAD_PARAMETER; handler_obj = ACPI_ALLOCATE_ZEROED(sizeof(*handler_obj)); if (!handler_obj) return AE_NO_MEMORY; acpi_populate_handler_object(handler_obj, ACPI_SYSTEM_NOTIFY, handler, context, parent_obj->next); parent_obj->next = handler_obj; return AE_OK; } /******************************************************************************* * * FUNCTION: acpi_install_notify_handler * * PARAMETERS: Device - The device for which notifies will be handled * handler_type - The type of handler: * ACPI_SYSTEM_NOTIFY: system_handler (00-7f) * ACPI_DEVICE_NOTIFY: driver_handler (80-ff) * ACPI_ALL_NOTIFY: both system and device * Handler - Address of the handler * Context - Value passed to the handler on each GPE * * RETURN: Status * * DESCRIPTION: Install a handler for notifies on an ACPI device * ******************************************************************************/ acpi_status acpi_install_notify_handler(acpi_handle device, u32 handler_type, acpi_notify_handler handler, void *context) { union acpi_operand_object *obj_desc; union acpi_operand_object *notify_obj; struct acpi_namespace_node *node; acpi_status status; ACPI_FUNCTION_TRACE(acpi_install_notify_handler); /* Parameter validation */ if ((!device) || (!handler) || (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) { return_ACPI_STATUS(AE_BAD_PARAMETER); } status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } /* Convert and validate the device handle */ node = acpi_ns_validate_handle(device); if (!node) { status = AE_BAD_PARAMETER; goto unlock_and_exit; } /* * Root Object: * Registering a notify handler on the root object indicates that the * caller wishes to receive notifications for all objects. Note that * only one <external> global handler can be regsitered (per notify type). */ if (device == ACPI_ROOT_OBJECT) { /* Make sure the handler is not already installed */ if (((handler_type & ACPI_SYSTEM_NOTIFY) && acpi_gbl_system_notify.handler) || ((handler_type & ACPI_DEVICE_NOTIFY) && acpi_gbl_device_notify.handler)) { status = AE_ALREADY_EXISTS; goto unlock_and_exit; } if (handler_type & ACPI_SYSTEM_NOTIFY) { acpi_gbl_system_notify.node = node; acpi_gbl_system_notify.handler = handler; acpi_gbl_system_notify.context = context; } if (handler_type & ACPI_DEVICE_NOTIFY) { acpi_gbl_device_notify.node = node; acpi_gbl_device_notify.handler = handler; acpi_gbl_device_notify.context = context; } /* Global notify handler installed */ } /* * All Other Objects: * Caller will only receive notifications specific to the target object. * Note that only certain object types can receive notifications. */ else { /* Notifies allowed on this object? */ if (!acpi_ev_is_notify_object(node)) { status = AE_TYPE; goto unlock_and_exit; } /* Check for an existing internal object */ obj_desc = acpi_ns_get_attached_object(node); if (obj_desc) { /* Object exists. */ /* For a device notify, make sure there's no handler. */ if ((handler_type & ACPI_DEVICE_NOTIFY) && obj_desc->common_notify.device_notify) { status = AE_ALREADY_EXISTS; goto unlock_and_exit; } /* System notifies may have more handlers installed. */ notify_obj = obj_desc->common_notify.system_notify; if ((handler_type & ACPI_SYSTEM_NOTIFY) && notify_obj) { struct acpi_object_notify_handler *parent_obj; if (handler_type & ACPI_DEVICE_NOTIFY) { status = AE_ALREADY_EXISTS; goto unlock_and_exit; } parent_obj = ¬ify_obj->notify; status = acpi_add_handler_object(parent_obj, handler, context); goto unlock_and_exit; } } else { /* Create a new object */ obj_desc = acpi_ut_create_internal_object(node->type); if (!obj_desc) { status = AE_NO_MEMORY; goto unlock_and_exit; } /* Attach new object to the Node */ status = acpi_ns_attach_object(device, obj_desc, node->type); /* Remove local reference to the object */ acpi_ut_remove_reference(obj_desc); if (ACPI_FAILURE(status)) { goto unlock_and_exit; } } /* Install the handler */ notify_obj = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_NOTIFY); if (!notify_obj) { status = AE_NO_MEMORY; goto unlock_and_exit; } acpi_populate_handler_object(¬ify_obj->notify, handler_type, handler, context, NULL); if (handler_type & ACPI_SYSTEM_NOTIFY) { obj_desc->common_notify.system_notify = notify_obj; } if (handler_type & ACPI_DEVICE_NOTIFY) { obj_desc->common_notify.device_notify = notify_obj; } if (handler_type == ACPI_ALL_NOTIFY) { /* Extra ref if installed in both */ acpi_ut_add_reference(notify_obj); } } unlock_and_exit: (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); return_ACPI_STATUS(status); } ACPI_EXPORT_SYMBOL(acpi_install_notify_handler) /******************************************************************************* * * FUNCTION: acpi_remove_notify_handler * * PARAMETERS: Device - The device for which notifies will be handled * handler_type - The type of handler: * ACPI_SYSTEM_NOTIFY: system_handler (00-7f) * ACPI_DEVICE_NOTIFY: driver_handler (80-ff) * ACPI_ALL_NOTIFY: both system and device * Handler - Address of the handler * * RETURN: Status * * DESCRIPTION: Remove a handler for notifies on an ACPI device * ******************************************************************************/ acpi_status acpi_remove_notify_handler(acpi_handle device, u32 handler_type, acpi_notify_handler handler) { union acpi_operand_object *notify_obj; union acpi_operand_object *obj_desc; struct acpi_namespace_node *node; acpi_status status; ACPI_FUNCTION_TRACE(acpi_remove_notify_handler); /* Parameter validation */ if ((!device) || (!handler) || (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) { status = AE_BAD_PARAMETER; goto exit; } /* Make sure all deferred tasks are completed */ acpi_os_wait_events_complete(NULL); status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); if (ACPI_FAILURE(status)) { goto exit; } /* Convert and validate the device handle */ node = acpi_ns_validate_handle(device); if (!node) { status = AE_BAD_PARAMETER; goto unlock_and_exit; } /* Root Object */ if (device == ACPI_ROOT_OBJECT) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Removing notify handler for namespace root object\n")); if (((handler_type & ACPI_SYSTEM_NOTIFY) && !acpi_gbl_system_notify.handler) || ((handler_type & ACPI_DEVICE_NOTIFY) && !acpi_gbl_device_notify.handler)) { status = AE_NOT_EXIST; goto unlock_and_exit; } if (handler_type & ACPI_SYSTEM_NOTIFY) { acpi_gbl_system_notify.node = NULL; acpi_gbl_system_notify.handler = NULL; acpi_gbl_system_notify.context = NULL; } if (handler_type & ACPI_DEVICE_NOTIFY) { acpi_gbl_device_notify.node = NULL; acpi_gbl_device_notify.handler = NULL; acpi_gbl_device_notify.context = NULL; } } /* All Other Objects */ else { /* Notifies allowed on this object? */ if (!acpi_ev_is_notify_object(node)) { status = AE_TYPE; goto unlock_and_exit; } /* Check for an existing internal object */ obj_desc = acpi_ns_get_attached_object(node); if (!obj_desc) { status = AE_NOT_EXIST; goto unlock_and_exit; } /* Object exists - make sure there's an existing handler */ if (handler_type & ACPI_SYSTEM_NOTIFY) { struct acpi_object_notify_handler *handler_obj; struct acpi_object_notify_handler *parent_obj; notify_obj = obj_desc->common_notify.system_notify; if (!notify_obj) { status = AE_NOT_EXIST; goto unlock_and_exit; } handler_obj = ¬ify_obj->notify; parent_obj = NULL; while (handler_obj->handler != handler) { if (handler_obj->next) { parent_obj = handler_obj; handler_obj = handler_obj->next; } else { break; } } if (handler_obj->handler != handler) { status = AE_BAD_PARAMETER; goto unlock_and_exit; } /* * Remove the handler. There are three possible cases. * First, we may need to remove a non-embedded object. * Second, we may need to remove the embedded object's * handler data, while non-embedded objects exist. * Finally, we may need to remove the embedded object * entirely along with its container. */ if (parent_obj) { /* Non-embedded object is being removed. */ parent_obj->next = handler_obj->next; ACPI_FREE(handler_obj); } else if (notify_obj->notify.next) { /* * The handler matches the embedded object, but * there are more handler objects in the list. * Replace the embedded object's data with the * first next object's data and remove that * object. */ parent_obj = ¬ify_obj->notify; handler_obj = notify_obj->notify.next; *parent_obj = *handler_obj; ACPI_FREE(handler_obj); } else { /* No more handler objects in the list. */ obj_desc->common_notify.system_notify = NULL; acpi_ut_remove_reference(notify_obj); } } if (handler_type & ACPI_DEVICE_NOTIFY) { notify_obj = obj_desc->common_notify.device_notify; if (!notify_obj) { status = AE_NOT_EXIST; goto unlock_and_exit; } if (notify_obj->notify.handler != handler) { status = AE_BAD_PARAMETER; goto unlock_and_exit; } /* Remove the handler */ obj_desc->common_notify.device_notify = NULL; acpi_ut_remove_reference(notify_obj); } } unlock_and_exit: (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); exit: if (ACPI_FAILURE(status)) ACPI_EXCEPTION((AE_INFO, status, "Removing notify handler")); return_ACPI_STATUS(status); } ACPI_EXPORT_SYMBOL(acpi_remove_notify_handler) /******************************************************************************* * * FUNCTION: acpi_install_gpe_handler * * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT * defined GPEs) * gpe_number - The GPE number within the GPE block * Type - Whether this GPE should be treated as an * edge- or level-triggered interrupt. * Address - Address of the handler * Context - Value passed to the handler on each GPE * * RETURN: Status * * DESCRIPTION: Install a handler for a General Purpose Event. * ******************************************************************************/ acpi_status acpi_install_gpe_handler(acpi_handle gpe_device, u32 gpe_number, u32 type, acpi_gpe_handler address, void *context) { struct acpi_gpe_event_info *gpe_event_info; struct acpi_gpe_handler_info *handler; acpi_status status; acpi_cpu_flags flags; ACPI_FUNCTION_TRACE(acpi_install_gpe_handler); /* Parameter validation */ if ((!address) || (type & ~ACPI_GPE_XRUPT_TYPE_MASK)) { return_ACPI_STATUS(AE_BAD_PARAMETER); } status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } /* Allocate memory for the handler object */ handler = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_handler_info)); if (!handler) { status = AE_NO_MEMORY; goto unlock_and_exit; } flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); /* Ensure that we have a valid GPE number */ gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number); if (!gpe_event_info) { status = AE_BAD_PARAMETER; goto free_and_exit; } /* Make sure that there isn't a handler there already */ if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) == ACPI_GPE_DISPATCH_HANDLER) { status = AE_ALREADY_EXISTS; goto free_and_exit; } /* Allocate and init handler object */ handler->address = address; handler->context = context; handler->method_node = gpe_event_info->dispatch.method_node; handler->original_flags = gpe_event_info->flags & (ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK); /* * If the GPE is associated with a method, it might have been enabled * automatically during initialization, in which case it has to be * disabled now to avoid spurious execution of the handler. */ if ((handler->original_flags & ACPI_GPE_DISPATCH_METHOD) && gpe_event_info->runtime_count) { handler->originally_enabled = 1; (void)acpi_ev_remove_gpe_reference(gpe_event_info); } /* Install the handler */ gpe_event_info->dispatch.handler = handler; /* Setup up dispatch flags to indicate handler (vs. method) */ gpe_event_info->flags &= ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK); gpe_event_info->flags |= (u8) (type | ACPI_GPE_DISPATCH_HANDLER); acpi_os_release_lock(acpi_gbl_gpe_lock, flags); unlock_and_exit: (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); return_ACPI_STATUS(status); free_and_exit: acpi_os_release_lock(acpi_gbl_gpe_lock, flags); ACPI_FREE(handler); goto unlock_and_exit; } ACPI_EXPORT_SYMBOL(acpi_install_gpe_handler) /******************************************************************************* * * FUNCTION: acpi_remove_gpe_handler * * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT * defined GPEs) * gpe_number - The event to remove a handler * Address - Address of the handler * * RETURN: Status * * DESCRIPTION: Remove a handler for a General Purpose acpi_event. * ******************************************************************************/ acpi_status acpi_remove_gpe_handler(acpi_handle gpe_device, u32 gpe_number, acpi_gpe_handler address) { struct acpi_gpe_event_info *gpe_event_info; struct acpi_gpe_handler_info *handler; acpi_status status; acpi_cpu_flags flags; ACPI_FUNCTION_TRACE(acpi_remove_gpe_handler); /* Parameter validation */ if (!address) { return_ACPI_STATUS(AE_BAD_PARAMETER); } /* Make sure all deferred tasks are completed */ acpi_os_wait_events_complete(NULL); status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); /* Ensure that we have a valid GPE number */ gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number); if (!gpe_event_info) { status = AE_BAD_PARAMETER; goto unlock_and_exit; } /* Make sure that a handler is indeed installed */ if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) != ACPI_GPE_DISPATCH_HANDLER) { status = AE_NOT_EXIST; goto unlock_and_exit; } /* Make sure that the installed handler is the same */ if (gpe_event_info->dispatch.handler->address != address) { status = AE_BAD_PARAMETER; goto unlock_and_exit; } /* Remove the handler */ handler = gpe_event_info->dispatch.handler; /* Restore Method node (if any), set dispatch flags */ gpe_event_info->dispatch.method_node = handler->method_node; gpe_event_info->flags &= ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK); gpe_event_info->flags |= handler->original_flags; /* * If the GPE was previously associated with a method and it was * enabled, it should be enabled at this point to restore the * post-initialization configuration. */ if ((handler->original_flags & ACPI_GPE_DISPATCH_METHOD) && handler->originally_enabled) (void)acpi_ev_add_gpe_reference(gpe_event_info); /* Now we can free the handler object */ ACPI_FREE(handler); unlock_and_exit: acpi_os_release_lock(acpi_gbl_gpe_lock, flags); (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); return_ACPI_STATUS(status); } ACPI_EXPORT_SYMBOL(acpi_remove_gpe_handler) /******************************************************************************* * * FUNCTION: acpi_acquire_global_lock * * PARAMETERS: Timeout - How long the caller is willing to wait * Handle - Where the handle to the lock is returned * (if acquired) * * RETURN: Status * * DESCRIPTION: Acquire the ACPI Global Lock * * Note: Allows callers with the same thread ID to acquire the global lock * multiple times. In other words, externally, the behavior of the global lock * is identical to an AML mutex. On the first acquire, a new handle is * returned. On any subsequent calls to acquire by the same thread, the same * handle is returned. * ******************************************************************************/ acpi_status acpi_acquire_global_lock(u16 timeout, u32 * handle) { acpi_status status; if (!handle) { return (AE_BAD_PARAMETER); } /* Must lock interpreter to prevent race conditions */ acpi_ex_enter_interpreter(); status = acpi_ex_acquire_mutex_object(timeout, acpi_gbl_global_lock_mutex, acpi_os_get_thread_id()); if (ACPI_SUCCESS(status)) { /* Return the global lock handle (updated in acpi_ev_acquire_global_lock) */ *handle = acpi_gbl_global_lock_handle; } acpi_ex_exit_interpreter(); return (status); } ACPI_EXPORT_SYMBOL(acpi_acquire_global_lock) /******************************************************************************* * * FUNCTION: acpi_release_global_lock * * PARAMETERS: Handle - Returned from acpi_acquire_global_lock * * RETURN: Status * * DESCRIPTION: Release the ACPI Global Lock. The handle must be valid. * ******************************************************************************/ acpi_status acpi_release_global_lock(u32 handle) { acpi_status status; if (!handle || (handle != acpi_gbl_global_lock_handle)) { return (AE_NOT_ACQUIRED); } status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex); return (status); } ACPI_EXPORT_SYMBOL(acpi_release_global_lock)