1 /******************************************************************************
3 * Module Name: evxfregn - External Interfaces, ACPI Operation Regions and
6 *****************************************************************************/
9 * Copyright (C) 2000 - 2005, R. Byron Moore
10 * All rights reserved.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions, and the following disclaimer,
17 * without modification.
18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19 * substantially similar to the "NO WARRANTY" disclaimer below
20 * ("Disclaimer") and any redistribution must be conditioned upon
21 * including a substantially similar Disclaimer requirement for further
22 * binary redistribution.
23 * 3. Neither the names of the above-listed copyright holders nor the names
24 * of any contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
27 * Alternatively, this software may be distributed under the terms of the
28 * GNU General Public License ("GPL") version 2 as published by the Free
29 * Software Foundation.
32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42 * POSSIBILITY OF SUCH DAMAGES.
45 #include <linux/module.h>
47 #include <acpi/acpi.h>
48 #include <acpi/acnamesp.h>
49 #include <acpi/acevents.h>
51 #define _COMPONENT ACPI_EVENTS
52 ACPI_MODULE_NAME ("evxfregn")
55 /*******************************************************************************
57 * FUNCTION: acpi_install_address_space_handler
59 * PARAMETERS: Device - Handle for the device
60 * space_id - The address space ID
61 * Handler - Address of the handler
62 * Setup - Address of the setup function
63 * Context - Value passed to the handler on each access
67 * DESCRIPTION: Install a handler for all op_regions of a given space_id.
69 ******************************************************************************/
72 acpi_install_address_space_handler (
74 acpi_adr_space_type space_id,
75 acpi_adr_space_handler handler,
76 acpi_adr_space_setup setup,
79 struct acpi_namespace_node *node;
83 ACPI_FUNCTION_TRACE ("acpi_install_address_space_handler");
86 /* Parameter validation */
89 return_ACPI_STATUS (AE_BAD_PARAMETER);
92 status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
93 if (ACPI_FAILURE (status)) {
94 return_ACPI_STATUS (status);
97 /* Convert and validate the device handle */
99 node = acpi_ns_map_handle_to_node (device);
101 status = AE_BAD_PARAMETER;
102 goto unlock_and_exit;
105 /* Install the handler for all Regions for this Space ID */
107 status = acpi_ev_install_space_handler (node, space_id, handler, setup, context);
108 if (ACPI_FAILURE (status)) {
109 goto unlock_and_exit;
112 /* Run all _REG methods for this address space */
114 status = acpi_ev_execute_reg_methods (node, space_id);
117 (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
118 return_ACPI_STATUS (status);
120 EXPORT_SYMBOL(acpi_install_address_space_handler);
123 /*******************************************************************************
125 * FUNCTION: acpi_remove_address_space_handler
127 * PARAMETERS: Device - Handle for the device
128 * space_id - The address space ID
129 * Handler - Address of the handler
133 * DESCRIPTION: Remove a previously installed handler.
135 ******************************************************************************/
138 acpi_remove_address_space_handler (
140 acpi_adr_space_type space_id,
141 acpi_adr_space_handler handler)
143 union acpi_operand_object *obj_desc;
144 union acpi_operand_object *handler_obj;
145 union acpi_operand_object *region_obj;
146 union acpi_operand_object **last_obj_ptr;
147 struct acpi_namespace_node *node;
151 ACPI_FUNCTION_TRACE ("acpi_remove_address_space_handler");
154 /* Parameter validation */
157 return_ACPI_STATUS (AE_BAD_PARAMETER);
160 status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
161 if (ACPI_FAILURE (status)) {
162 return_ACPI_STATUS (status);
165 /* Convert and validate the device handle */
167 node = acpi_ns_map_handle_to_node (device);
169 status = AE_BAD_PARAMETER;
170 goto unlock_and_exit;
173 /* Make sure the internal object exists */
175 obj_desc = acpi_ns_get_attached_object (node);
177 status = AE_NOT_EXIST;
178 goto unlock_and_exit;
181 /* Find the address handler the user requested */
183 handler_obj = obj_desc->device.handler;
184 last_obj_ptr = &obj_desc->device.handler;
185 while (handler_obj) {
186 /* We have a handler, see if user requested this one */
188 if (handler_obj->address_space.space_id == space_id) {
189 /* Matched space_id, first dereference this in the Regions */
191 ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
192 "Removing address handler %p(%p) for region %s on Device %p(%p)\n",
193 handler_obj, handler, acpi_ut_get_region_name (space_id),
196 region_obj = handler_obj->address_space.region_list;
198 /* Walk the handler's region list */
202 * First disassociate the handler from the region.
204 * NOTE: this doesn't mean that the region goes away
205 * The region is just inaccessible as indicated to
208 acpi_ev_detach_region (region_obj, TRUE);
211 * Walk the list: Just grab the head because the
212 * detach_region removed the previous head.
214 region_obj = handler_obj->address_space.region_list;
218 /* Remove this Handler object from the list */
220 *last_obj_ptr = handler_obj->address_space.next;
222 /* Now we can delete the handler object */
224 acpi_ut_remove_reference (handler_obj);
225 goto unlock_and_exit;
228 /* Walk the linked list of handlers */
230 last_obj_ptr = &handler_obj->address_space.next;
231 handler_obj = handler_obj->address_space.next;
234 /* The handler does not exist */
236 ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
237 "Unable to remove address handler %p for %s(%X), dev_node %p, obj %p\n",
238 handler, acpi_ut_get_region_name (space_id), space_id, node, obj_desc));
240 status = AE_NOT_EXIST;
243 (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
244 return_ACPI_STATUS (status);
246 EXPORT_SYMBOL(acpi_remove_address_space_handler);