Subversion Repositories test_project

/******************************************************************************

 *

 * 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)