| /****************************************************************************** |
| * |
| * Module Name: evxface - External interfaces for ACPI events |
| * |
| *****************************************************************************/ |
| |
| /* |
| * Copyright (C) 2000 - 2010, 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 <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_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_event_handler address, void *context) |
| { |
| struct acpi_gpe_event_info *gpe_event_info; |
| struct acpi_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_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_event_handler address) |
| { |
| struct acpi_gpe_event_info *gpe_event_info; |
| struct acpi_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) |