1 /******************************************************************************
2 *
3 * Module Name: evxfregn - External Interfaces, ACPI Operation Regions and
4 * Address Spaces.
5 *
6 *****************************************************************************/
7
8 /*
9 * Copyright (C) 2000 - 2007, R. Byron Moore
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
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.
26 *
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.
30 *
31 * NO WARRANTY
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.
43 */
44
45 #include <acpi/acpi.h>
46 #include <acpi/acnamesp.h>
47 #include <acpi/acevents.h>
48
49 #define _COMPONENT ACPI_EVENTS
50 ACPI_MODULE_NAME("evxfregn")
51
52 /*******************************************************************************
53 *
54 * FUNCTION: acpi_install_address_space_handler
55 *
56 * PARAMETERS: Device - Handle for the device
57 * space_id - The address space ID
58 * Handler - Address of the handler
59 * Setup - Address of the setup function
60 * Context - Value passed to the handler on each access
61 *
62 * RETURN: Status
63 *
64 * DESCRIPTION: Install a handler for all op_regions of a given space_id.
65 *
66 ******************************************************************************/
67 acpi_status
68 acpi_install_address_space_handler(acpi_handle device,
69 acpi_adr_space_type space_id,
70 acpi_adr_space_handler handler,
71 acpi_adr_space_setup setup, void *context)
72 {
73 struct acpi_namespace_node *node;
74 acpi_status status;
75
76 ACPI_FUNCTION_TRACE(acpi_install_address_space_handler);
77
78 /* Parameter validation */
79
80 if (!device) {
81 return_ACPI_STATUS(AE_BAD_PARAMETER);
82 }
83
84 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
85 if (ACPI_FAILURE(status)) {
86 return_ACPI_STATUS(status);
87 }
88
89 /* Convert and validate the device handle */
90
91 node = acpi_ns_map_handle_to_node(device);
92 if (!node) {
93 status = AE_BAD_PARAMETER;
94 goto unlock_and_exit;
95 }
96
97 /* Install the handler for all Regions for this Space ID */
98
99 status =
100 acpi_ev_install_space_handler(node, space_id, handler, setup,
101 context);
102 if (ACPI_FAILURE(status)) {
103 goto unlock_and_exit;
104 }
105
106 /* Run all _REG methods for this address space */
107
108 status = acpi_ev_execute_reg_methods(node, space_id);
109
110 unlock_and_exit:
111 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
112 return_ACPI_STATUS(status);
113 }
114
115 ACPI_EXPORT_SYMBOL(acpi_install_address_space_handler)
116
117 /*******************************************************************************
118 *
119 * FUNCTION: acpi_remove_address_space_handler
120 *
121 * PARAMETERS: Device - Handle for the device
122 * space_id - The address space ID
123 * Handler - Address of the handler
124 *
125 * RETURN: Status
126 *
127 * DESCRIPTION: Remove a previously installed handler.
128 *
129 ******************************************************************************/
130 acpi_status
131 acpi_remove_address_space_handler(acpi_handle device,
132 acpi_adr_space_type space_id,
133 acpi_adr_space_handler handler)
134 {
135 union acpi_operand_object *obj_desc;
136 union acpi_operand_object *handler_obj;
137 union acpi_operand_object *region_obj;
138 union acpi_operand_object **last_obj_ptr;
139 struct acpi_namespace_node *node;
140 acpi_status status;
141
142 ACPI_FUNCTION_TRACE(acpi_remove_address_space_handler);
143
144 /* Parameter validation */
145
146 if (!device) {
147 return_ACPI_STATUS(AE_BAD_PARAMETER);
148 }
149
150 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
151 if (ACPI_FAILURE(status)) {
152 return_ACPI_STATUS(status);
153 }
154
155 /* Convert and validate the device handle */
156
157 node = acpi_ns_map_handle_to_node(device);
158 if (!node ||
159 ((node->type != ACPI_TYPE_DEVICE) &&
160 (node->type != ACPI_TYPE_PROCESSOR) &&
161 (node->type != ACPI_TYPE_THERMAL) &&
162 (node != acpi_gbl_root_node))) {
163 status = AE_BAD_PARAMETER;
164 goto unlock_and_exit;
165 }
166
167 /* Make sure the internal object exists */
168
169 obj_desc = acpi_ns_get_attached_object(node);
170 if (!obj_desc) {
171 status = AE_NOT_EXIST;
172 goto unlock_and_exit;
173 }
174
175 /* Find the address handler the user requested */
176
177 handler_obj = obj_desc->device.handler;
178 last_obj_ptr = &obj_desc->device.handler;
179 while (handler_obj) {
180
181 /* We have a handler, see if user requested this one */
182
183 if (handler_obj->address_space.space_id == space_id) {
184
185 /* Handler must be the same as the installed handler */
186
187 if (handler_obj->address_space.handler != handler) {
188 status = AE_BAD_PARAMETER;
189 goto unlock_and_exit;
190 }
191
192 /* Matched space_id, first dereference this in the Regions */
193
194 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
195 "Removing address handler %p(%p) for region %s on Device %p(%p)\n",
196 handler_obj, handler,
197 acpi_ut_get_region_name(space_id),
198 node, obj_desc));
199
200 region_obj = handler_obj->address_space.region_list;
201
202 /* Walk the handler's region list */
203
204 while (region_obj) {
205 /*
206 * First disassociate the handler from the region.
207 *
208 * NOTE: this doesn't mean that the region goes away
209 * The region is just inaccessible as indicated to
210 * the _REG method
211 */
212 acpi_ev_detach_region(region_obj, TRUE);
213
214 /*
215 * Walk the list: Just grab the head because the
216 * detach_region removed the previous head.
217 */
218 region_obj =
219 handler_obj->address_space.region_list;
220
221 }
222
223 /* Remove this Handler object from the list */
224
225 *last_obj_ptr = handler_obj->address_space.next;
226
227 /* Now we can delete the handler object */
228
229 acpi_ut_remove_reference(handler_obj);
230 goto unlock_and_exit;
231 }
232
233 /* Walk the linked list of handlers */
234
235 last_obj_ptr = &handler_obj->address_space.next;
236 handler_obj = handler_obj->address_space.next;
237 }
238
239 /* The handler does not exist */
240
241 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
242 "Unable to remove address handler %p for %s(%X), DevNode %p, obj %p\n",
243 handler, acpi_ut_get_region_name(space_id), space_id,
244 node, obj_desc));
245
246 status = AE_NOT_EXIST;
247
248 unlock_and_exit:
249 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
250 return_ACPI_STATUS(status);
251 }
252
253 ACPI_EXPORT_SYMBOL(acpi_remove_address_space_handler)
254
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