diff options
Diffstat (limited to 'drivers/acpi/events/evxfregn.c')
| -rw-r--r-- | drivers/acpi/events/evxfregn.c | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/drivers/acpi/events/evxfregn.c b/drivers/acpi/events/evxfregn.c new file mode 100644 index 00000000000..d058587b342 --- /dev/null +++ b/drivers/acpi/events/evxfregn.c @@ -0,0 +1,247 @@ +/****************************************************************************** + * + * Module Name: evxfregn - External Interfaces, ACPI Operation Regions and + * Address Spaces. + * + *****************************************************************************/ + +/* + * Copyright (C) 2000 - 2005, 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); + |