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evxfregn.c

/******************************************************************************
 *
 * Module Name: evxfregn - External Interfaces, ACPI Operation Regions and
 *                         Address Spaces.
 *
 *****************************************************************************/

/*
 * 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>

#define _COMPONENT          ACPI_EVENTS
ACPI_MODULE_NAME("evxfregn")

/*******************************************************************************
 *
 * FUNCTION:    acpi_install_address_space_handler
 *
 * PARAMETERS:  Device          - Handle for the device
 *              space_id        - The address space ID
 *              Handler         - Address of the handler
 *              Setup           - Address of the setup function
 *              Context         - Value passed to the handler on each access
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Install a handler for all op_regions of a given space_id.
 *
 ******************************************************************************/
acpi_status
acpi_install_address_space_handler(acpi_handle device,
                           acpi_adr_space_type space_id,
                           acpi_adr_space_handler handler,
                           acpi_adr_space_setup setup, void *context)
{
      struct acpi_namespace_node *node;
      acpi_status status;

      ACPI_FUNCTION_TRACE(acpi_install_address_space_handler);

      /* Parameter validation */

      if (!device) {
            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;
      }

      /* Install the handler for all Regions for this Space ID */

      status =
          acpi_ev_install_space_handler(node, space_id, handler, setup,
                                context);
      if (ACPI_FAILURE(status)) {
            goto unlock_and_exit;
      }

      /* Run all _REG methods for this address space */

      status = acpi_ev_execute_reg_methods(node, space_id);

      unlock_and_exit:
      (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
      return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_install_address_space_handler)

/*******************************************************************************
 *
 * FUNCTION:    acpi_remove_address_space_handler
 *
 * PARAMETERS:  Device          - Handle for the device
 *              space_id        - The address space ID
 *              Handler         - Address of the handler
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Remove a previously installed handler.
 *
 ******************************************************************************/
acpi_status
acpi_remove_address_space_handler(acpi_handle device,
                          acpi_adr_space_type space_id,
                          acpi_adr_space_handler handler)
{
      union acpi_operand_object *obj_desc;
      union acpi_operand_object *handler_obj;
      union acpi_operand_object *region_obj;
      union acpi_operand_object **last_obj_ptr;
      struct acpi_namespace_node *node;
      acpi_status status;

      ACPI_FUNCTION_TRACE(acpi_remove_address_space_handler);

      /* Parameter validation */

      if (!device) {
            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 ||
          ((node->type != ACPI_TYPE_DEVICE) &&
           (node->type != ACPI_TYPE_PROCESSOR) &&
           (node->type != ACPI_TYPE_THERMAL) &&
           (node != acpi_gbl_root_node))) {
            status = AE_BAD_PARAMETER;
            goto unlock_and_exit;
      }

      /* Make sure the internal object exists */

      obj_desc = acpi_ns_get_attached_object(node);
      if (!obj_desc) {
            status = AE_NOT_EXIST;
            goto unlock_and_exit;
      }

      /* Find the address handler the user requested */

      handler_obj = obj_desc->device.handler;
      last_obj_ptr = &obj_desc->device.handler;
      while (handler_obj) {

            /* We have a handler, see if user requested this one */

            if (handler_obj->address_space.space_id == space_id) {

                  /* Handler must be the same as the installed handler */

                  if (handler_obj->address_space.handler != handler) {
                        status = AE_BAD_PARAMETER;
                        goto unlock_and_exit;
                  }

                  /* Matched space_id, first dereference this in the Regions */

                  ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
                                "Removing address handler %p(%p) for region %s on Device %p(%p)\n",
                                handler_obj, handler,
                                acpi_ut_get_region_name(space_id),
                                node, obj_desc));

                  region_obj = handler_obj->address_space.region_list;

                  /* Walk the handler's region list */

                  while (region_obj) {
                        /*
                         * First disassociate the handler from the region.
                         *
                         * NOTE: this doesn't mean that the region goes away
                         * The region is just inaccessible as indicated to
                         * the _REG method
                         */
                        acpi_ev_detach_region(region_obj, TRUE);

                        /*
                         * Walk the list: Just grab the head because the
                         * detach_region removed the previous head.
                         */
                        region_obj =
                            handler_obj->address_space.region_list;

                  }

                  /* Remove this Handler object from the list */

                  *last_obj_ptr = handler_obj->address_space.next;

                  /* Now we can delete the handler object */

                  acpi_ut_remove_reference(handler_obj);
                  goto unlock_and_exit;
            }

            /* Walk the linked list of handlers */

            last_obj_ptr = &handler_obj->address_space.next;
            handler_obj = handler_obj->address_space.next;
      }

      /* The handler does not exist */

      ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
                    "Unable to remove address handler %p for %s(%X), DevNode %p, obj %p\n",
                    handler, acpi_ut_get_region_name(space_id), space_id,
                    node, obj_desc));

      status = AE_NOT_EXIST;

      unlock_and_exit:
      (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
      return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_remove_address_space_handler)

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