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

 *

 * Module Name: evxfregn - External Interfaces, ACPI Operation Regions and

 *                         Address Spaces.

 *

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

/*

 * Copyright (C) 2000 - 2015, 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.

 */

#define EXPORT_ACPI_INTERFACES

#include 

#include "accommon.h"

#include "acnamesp.h"

#include "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.

 *

 * NOTE: This function should only be called after acpi_enable_subsystem has

 * been called. This is because any _REG methods associated with the Space ID

 * are executed here, and these methods can only be safely executed after

 * the default handlers have been installed and the hardware has been

 * initialized (via acpi_enable_subsystem.)

 *

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

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_validate_handle(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;

	}

	/*

	 * For the default space_IDs, (the IDs for which there are default region handlers

	 * installed) Only execute the _REG methods if the global initialization _REG

	 * methods have already been run (via acpi_initialize_objects). In other words,

	 * we will defer the execution of the _REG methods for these space_IDs until

	 * execution of acpi_initialize_objects. This is done because we need the handlers

	 * for the default spaces (mem/io/pci/table) to be installed before we can run

	 * any control methods (or _REG methods). There is known BIOS code that depends

	 * on this.

	 *

	 * For all other space_IDs, we can safely execute the _REG methods immediately.

	 * This means that for IDs like embedded_controller, this function should be called

	 * only after acpi_enable_subsystem has been called.

	 */

	switch (space_id) {

	case ACPI_ADR_SPACE_SYSTEM_MEMORY:

	case ACPI_ADR_SPACE_SYSTEM_IO:

	case ACPI_ADR_SPACE_PCI_CONFIG:

	case ACPI_ADR_SPACE_DATA_TABLE:

		if (!acpi_gbl_reg_methods_executed) {

			/* We will defer execution of the _REG methods for this space */

			goto unlock_and_exit;

		}

		break;

	default:

		break;

	}

	/* 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_validate_handle(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)