Logo Search packages:      
Sourcecode: linux version File versions  Download package

evxface.c

/******************************************************************************
 *
 * Module Name: evxface - External interfaces for ACPI events
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2007, 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 <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);
}

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 %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 %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_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);
}

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;
      }

      status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
      if (ACPI_FAILURE(status)) {
            goto exit;
      }

      /* 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 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;
            }

            /* 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)) {
                  goto 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) {
                  notify_obj = obj_desc->common_notify.system_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;
                  }
                  /* 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)) {
                        goto exit;
                  }

                  /* 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) {
                        status = AE_NOT_EXIST;
                        goto unlock_and_exit;
                  }

                  if (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)) {
                        goto 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)) {
            status = AE_BAD_PARAMETER;
            goto exit;
      }

      status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
      if (ACPI_FAILURE(status)) {
            goto exit;
      }

      /* 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_ALLOCATE_ZEROED(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 */

      flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
      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, flags);

      unlock_and_exit:
      (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
      exit:
      if (ACPI_FAILURE(status))
            ACPI_EXCEPTION((AE_INFO, status,
                        "Installing notify handler failed"));
      return_ACPI_STATUS(status);
}

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);
      }

      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 */

      flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
      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, flags);

      /* Now we can free the handler object */

      ACPI_FREE(handler);

      unlock_and_exit:
      (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
 *
 ******************************************************************************/
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_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);
}

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 != acpi_gbl_global_lock_handle) {
            return (AE_NOT_ACQUIRED);
      }

      status = acpi_ev_release_global_lock();
      return (status);
}

ACPI_EXPORT_SYMBOL(acpi_release_global_lock)

Generated by  Doxygen 1.6.0   Back to index