diff options
Diffstat (limited to 'drivers/acpi/events/evxface.c')
| -rw-r--r-- | drivers/acpi/events/evxface.c | 834 |
1 files changed, 834 insertions, 0 deletions
diff --git a/drivers/acpi/events/evxface.c b/drivers/acpi/events/evxface.c new file mode 100644 index 00000000000..0bfec10a5f1 --- /dev/null +++ b/drivers/acpi/events/evxface.c @@ -0,0 +1,834 @@ +/****************************************************************************** + * + * Module Name: evxface - External interfaces for ACPI events + * + *****************************************************************************/ + +/* + * Copyright (C) 2000 - 2005, R. Byron Moore + * 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/module.h> + +#include <acpi/acpi.h> +#include <acpi/acnamesp.h> +#include <acpi/acevents.h> +#include <acpi/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); +} +#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_DEBUG_PRINT ((ACPI_DB_WARN, "Could not enable fixed event.\n")); + + /* 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); +} +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_DEBUG_PRINT ((ACPI_DB_WARN, + "Could not write to fixed event enable register.\n")); + } + 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); +} +EXPORT_SYMBOL(acpi_remove_fixed_event_handler); + + +/******************************************************************************* + * + * 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_map_handle_to_node (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 - make sure there's no handler */ + + if (((handler_type & ACPI_SYSTEM_NOTIFY) && + obj_desc->common_notify.system_notify) || + ((handler_type & ACPI_DEVICE_NOTIFY) && + obj_desc->common_notify.device_notify)) { + status = AE_ALREADY_EXISTS; + 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; + } + + notify_obj->notify.node = node; + notify_obj->notify.handler = handler; + notify_obj->notify.context = context; + + 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); +} +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)) { + 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_map_handle_to_node (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 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; + } + + /* Make sure all deferred tasks are completed */ + + (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE); + acpi_os_wait_events_complete(NULL); + status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + + 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) { + notify_obj = obj_desc->common_notify.system_notify; + if ((!notify_obj) || + (notify_obj->notify.handler != handler)) { + status = AE_BAD_PARAMETER; + goto unlock_and_exit; + } + /* Make sure all deferred tasks are completed */ + + (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE); + acpi_os_wait_events_complete(NULL); + status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + + /* Remove the handler */ + 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) || + (notify_obj->notify.handler != handler)) { + status = AE_BAD_PARAMETER; + goto unlock_and_exit; + } + /* Make sure all deferred tasks are completed */ + + (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE); + acpi_os_wait_events_complete(NULL); + status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + + /* 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); + return_ACPI_STATUS (status); +} +EXPORT_SYMBOL(acpi_remove_notify_handler); + + +/******************************************************************************* + * + * FUNCTION: acpi_install_gpe_handler + * + * PARAMETERS: gpe_number - The GPE number within the GPE block + * gpe_block - GPE block (NULL == FADT GPEs) + * 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_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); + } + + /* 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 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 unlock_and_exit; + } + + /* Allocate and init handler object */ + + handler = ACPI_MEM_CALLOCATE (sizeof (struct acpi_handler_info)); + if (!handler) { + status = AE_NO_MEMORY; + goto unlock_and_exit; + } + + handler->address = address; + handler->context = context; + handler->method_node = gpe_event_info->dispatch.method_node; + + /* Disable the GPE before installing the handler */ + + status = acpi_ev_disable_gpe (gpe_event_info); + if (ACPI_FAILURE (status)) { + goto unlock_and_exit; + } + + /* Install the handler */ + + acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR); + 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); /* Clear bits */ + gpe_event_info->flags |= (u8) (type | ACPI_GPE_DISPATCH_HANDLER); + + acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR); + + +unlock_and_exit: + (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS); + return_ACPI_STATUS (status); +} +EXPORT_SYMBOL(acpi_install_gpe_handler); + + +/******************************************************************************* + * + * FUNCTION: acpi_remove_gpe_handler + * + * PARAMETERS: gpe_number - The event to remove a handler + * gpe_block - GPE block (NULL == FADT GPEs) + * 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_FUNCTION_TRACE ("acpi_remove_gpe_handler"); + + + /* Parameter validation */ + + if (!address) { + return_ACPI_STATUS (AE_BAD_PARAMETER); + } + + status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + + /* 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; + } + + /* Disable the GPE before removing the handler */ + + status = acpi_ev_disable_gpe (gpe_event_info); + if (ACPI_FAILURE (status)) { + goto unlock_and_exit; + } + + /* Make sure all deferred tasks are completed */ + + (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS); + acpi_os_wait_events_complete(NULL); + status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + + /* Remove the handler */ + + acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR); + 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_DISPATCH_MASK; /* Clear bits */ + if (handler->method_node) { + gpe_event_info->flags |= ACPI_GPE_DISPATCH_METHOD; + } + acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR); + + /* Now we can free the handler object */ + + ACPI_MEM_FREE (handler); + + +unlock_and_exit: + (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS); + return_ACPI_STATUS (status); +} +EXPORT_SYMBOL(acpi_remove_gpe_handler); + + +/******************************************************************************* + * + * FUNCTION: acpi_acquire_global_lock + * + * PARAMETERS: Timeout - How long the caller is willing to wait + * out_handle - A handle to the lock if acquired + * + * RETURN: Status + * + * DESCRIPTION: Acquire the ACPI Global Lock + * + ******************************************************************************/ + +acpi_status +acpi_acquire_global_lock ( + u16 timeout, + u32 *handle) +{ + acpi_status status; + + + if (!handle) { + return (AE_BAD_PARAMETER); + } + + status = acpi_ex_enter_interpreter (); + if (ACPI_FAILURE (status)) { + return (status); + } + + status = acpi_ev_acquire_global_lock (timeout); + acpi_ex_exit_interpreter (); + + if (ACPI_SUCCESS (status)) { + acpi_gbl_global_lock_handle++; + *handle = acpi_gbl_global_lock_handle; + } + + return (status); +} +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 + * + ******************************************************************************/ + +acpi_status +acpi_release_global_lock ( + u32 handle) +{ + acpi_status status; + + + if (handle != acpi_gbl_global_lock_handle) { + return (AE_NOT_ACQUIRED); + } + + status = acpi_ev_release_global_lock (); + return (status); +} +EXPORT_SYMBOL(acpi_release_global_lock); + |