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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: evxfregn - External Interfaces, ACPI Operation Regions and | |
4 | * Address Spaces. | |
5 | * | |
6 | *****************************************************************************/ | |
7 | ||
8 | /* | |
4a90c7e8 | 9 | * Copyright (C) 2000 - 2006, R. Byron Moore |
1da177e4 LT |
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 <linux/module.h> | |
46 | ||
47 | #include <acpi/acpi.h> | |
48 | #include <acpi/acnamesp.h> | |
49 | #include <acpi/acevents.h> | |
50 | ||
51 | #define _COMPONENT ACPI_EVENTS | |
4be44fcd | 52 | ACPI_MODULE_NAME("evxfregn") |
1da177e4 LT |
53 | |
54 | /******************************************************************************* | |
55 | * | |
56 | * FUNCTION: acpi_install_address_space_handler | |
57 | * | |
58 | * PARAMETERS: Device - Handle for the device | |
59 | * space_id - The address space ID | |
60 | * Handler - Address of the handler | |
61 | * Setup - Address of the setup function | |
62 | * Context - Value passed to the handler on each access | |
63 | * | |
64 | * RETURN: Status | |
65 | * | |
66 | * DESCRIPTION: Install a handler for all op_regions of a given space_id. | |
67 | * | |
68 | ******************************************************************************/ | |
1da177e4 | 69 | acpi_status |
4be44fcd LB |
70 | acpi_install_address_space_handler(acpi_handle device, |
71 | acpi_adr_space_type space_id, | |
72 | acpi_adr_space_handler handler, | |
73 | acpi_adr_space_setup setup, void *context) | |
1da177e4 | 74 | { |
4be44fcd LB |
75 | struct acpi_namespace_node *node; |
76 | acpi_status status; | |
1da177e4 | 77 | |
4be44fcd | 78 | ACPI_FUNCTION_TRACE("acpi_install_address_space_handler"); |
1da177e4 LT |
79 | |
80 | /* Parameter validation */ | |
81 | ||
82 | if (!device) { | |
4be44fcd | 83 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
84 | } |
85 | ||
4be44fcd LB |
86 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
87 | if (ACPI_FAILURE(status)) { | |
88 | return_ACPI_STATUS(status); | |
1da177e4 LT |
89 | } |
90 | ||
91 | /* Convert and validate the device handle */ | |
92 | ||
4be44fcd | 93 | node = acpi_ns_map_handle_to_node(device); |
1da177e4 LT |
94 | if (!node) { |
95 | status = AE_BAD_PARAMETER; | |
96 | goto unlock_and_exit; | |
97 | } | |
98 | ||
99 | /* Install the handler for all Regions for this Space ID */ | |
100 | ||
4be44fcd LB |
101 | status = |
102 | acpi_ev_install_space_handler(node, space_id, handler, setup, | |
103 | context); | |
104 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
105 | goto unlock_and_exit; |
106 | } | |
107 | ||
108 | /* Run all _REG methods for this address space */ | |
109 | ||
4be44fcd | 110 | status = acpi_ev_execute_reg_methods(node, space_id); |
1da177e4 | 111 | |
4be44fcd LB |
112 | unlock_and_exit: |
113 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
114 | return_ACPI_STATUS(status); | |
1da177e4 | 115 | } |
1da177e4 | 116 | |
4be44fcd | 117 | EXPORT_SYMBOL(acpi_install_address_space_handler); |
1da177e4 LT |
118 | |
119 | /******************************************************************************* | |
120 | * | |
121 | * FUNCTION: acpi_remove_address_space_handler | |
122 | * | |
123 | * PARAMETERS: Device - Handle for the device | |
124 | * space_id - The address space ID | |
125 | * Handler - Address of the handler | |
126 | * | |
127 | * RETURN: Status | |
128 | * | |
129 | * DESCRIPTION: Remove a previously installed handler. | |
130 | * | |
131 | ******************************************************************************/ | |
132 | ||
133 | acpi_status | |
4be44fcd LB |
134 | acpi_remove_address_space_handler(acpi_handle device, |
135 | acpi_adr_space_type space_id, | |
136 | acpi_adr_space_handler handler) | |
1da177e4 | 137 | { |
4be44fcd LB |
138 | union acpi_operand_object *obj_desc; |
139 | union acpi_operand_object *handler_obj; | |
140 | union acpi_operand_object *region_obj; | |
141 | union acpi_operand_object **last_obj_ptr; | |
142 | struct acpi_namespace_node *node; | |
143 | acpi_status status; | |
1da177e4 | 144 | |
4be44fcd | 145 | ACPI_FUNCTION_TRACE("acpi_remove_address_space_handler"); |
1da177e4 LT |
146 | |
147 | /* Parameter validation */ | |
148 | ||
149 | if (!device) { | |
4be44fcd | 150 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
151 | } |
152 | ||
4be44fcd LB |
153 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
154 | if (ACPI_FAILURE(status)) { | |
155 | return_ACPI_STATUS(status); | |
1da177e4 LT |
156 | } |
157 | ||
158 | /* Convert and validate the device handle */ | |
159 | ||
4be44fcd | 160 | node = acpi_ns_map_handle_to_node(device); |
1da177e4 LT |
161 | if (!node) { |
162 | status = AE_BAD_PARAMETER; | |
163 | goto unlock_and_exit; | |
164 | } | |
165 | ||
166 | /* Make sure the internal object exists */ | |
167 | ||
4be44fcd | 168 | obj_desc = acpi_ns_get_attached_object(node); |
1da177e4 LT |
169 | if (!obj_desc) { |
170 | status = AE_NOT_EXIST; | |
171 | goto unlock_and_exit; | |
172 | } | |
173 | ||
174 | /* Find the address handler the user requested */ | |
175 | ||
176 | handler_obj = obj_desc->device.handler; | |
177 | last_obj_ptr = &obj_desc->device.handler; | |
178 | while (handler_obj) { | |
52fc0b02 | 179 | |
1da177e4 LT |
180 | /* We have a handler, see if user requested this one */ |
181 | ||
182 | if (handler_obj->address_space.space_id == space_id) { | |
52fc0b02 | 183 | |
1da177e4 LT |
184 | /* Matched space_id, first dereference this in the Regions */ |
185 | ||
4be44fcd LB |
186 | ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, |
187 | "Removing address handler %p(%p) for region %s on Device %p(%p)\n", | |
188 | handler_obj, handler, | |
189 | acpi_ut_get_region_name(space_id), | |
190 | node, obj_desc)); | |
1da177e4 LT |
191 | |
192 | region_obj = handler_obj->address_space.region_list; | |
193 | ||
194 | /* Walk the handler's region list */ | |
195 | ||
196 | while (region_obj) { | |
197 | /* | |
198 | * First disassociate the handler from the region. | |
199 | * | |
200 | * NOTE: this doesn't mean that the region goes away | |
201 | * The region is just inaccessible as indicated to | |
202 | * the _REG method | |
203 | */ | |
4be44fcd | 204 | acpi_ev_detach_region(region_obj, TRUE); |
1da177e4 LT |
205 | |
206 | /* | |
207 | * Walk the list: Just grab the head because the | |
208 | * detach_region removed the previous head. | |
209 | */ | |
4be44fcd LB |
210 | region_obj = |
211 | handler_obj->address_space.region_list; | |
1da177e4 LT |
212 | |
213 | } | |
214 | ||
215 | /* Remove this Handler object from the list */ | |
216 | ||
217 | *last_obj_ptr = handler_obj->address_space.next; | |
218 | ||
219 | /* Now we can delete the handler object */ | |
220 | ||
4be44fcd | 221 | acpi_ut_remove_reference(handler_obj); |
1da177e4 LT |
222 | goto unlock_and_exit; |
223 | } | |
224 | ||
225 | /* Walk the linked list of handlers */ | |
226 | ||
227 | last_obj_ptr = &handler_obj->address_space.next; | |
228 | handler_obj = handler_obj->address_space.next; | |
229 | } | |
230 | ||
231 | /* The handler does not exist */ | |
232 | ||
4be44fcd LB |
233 | ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, |
234 | "Unable to remove address handler %p for %s(%X), dev_node %p, obj %p\n", | |
235 | handler, acpi_ut_get_region_name(space_id), space_id, | |
236 | node, obj_desc)); | |
1da177e4 LT |
237 | |
238 | status = AE_NOT_EXIST; | |
239 | ||
4be44fcd LB |
240 | unlock_and_exit: |
241 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
242 | return_ACPI_STATUS(status); | |
1da177e4 | 243 | } |
1da177e4 | 244 | |
4be44fcd | 245 | EXPORT_SYMBOL(acpi_remove_address_space_handler); |