| /****************************************************************************** |
| * |
| * Module Name: evxfregn - External Interfaces, ACPI Operation Regions and |
| * Address Spaces. |
| * |
| *****************************************************************************/ |
| |
| /* |
| * Copyright (C) 2000 - 2006, 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> |
| |
| #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); |
| } |
| |
| 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) { |
| 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) { |
| |
| /* 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), dev_node %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); |
| } |
| |
| EXPORT_SYMBOL(acpi_remove_address_space_handler); |