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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 | /* | |
9 | * Copyright (C) 2000 - 2005, 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 <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 | |
52 | ACPI_MODULE_NAME ("evxfregn") | |
53 | ||
54 | ||
55 | /******************************************************************************* | |
56 | * | |
57 | * FUNCTION: acpi_install_address_space_handler | |
58 | * | |
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 | |
64 | * | |
65 | * RETURN: Status | |
66 | * | |
67 | * DESCRIPTION: Install a handler for all op_regions of a given space_id. | |
68 | * | |
69 | ******************************************************************************/ | |
70 | ||
71 | acpi_status | |
72 | acpi_install_address_space_handler ( | |
73 | acpi_handle device, | |
74 | acpi_adr_space_type space_id, | |
75 | acpi_adr_space_handler handler, | |
76 | acpi_adr_space_setup setup, | |
77 | void *context) | |
78 | { | |
79 | struct acpi_namespace_node *node; | |
80 | acpi_status status; | |
81 | ||
82 | ||
83 | ACPI_FUNCTION_TRACE ("acpi_install_address_space_handler"); | |
84 | ||
85 | ||
86 | /* Parameter validation */ | |
87 | ||
88 | if (!device) { | |
89 | return_ACPI_STATUS (AE_BAD_PARAMETER); | |
90 | } | |
91 | ||
92 | status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE); | |
93 | if (ACPI_FAILURE (status)) { | |
94 | return_ACPI_STATUS (status); | |
95 | } | |
96 | ||
97 | /* Convert and validate the device handle */ | |
98 | ||
99 | node = acpi_ns_map_handle_to_node (device); | |
100 | if (!node) { | |
101 | status = AE_BAD_PARAMETER; | |
102 | goto unlock_and_exit; | |
103 | } | |
104 | ||
105 | /* Install the handler for all Regions for this Space ID */ | |
106 | ||
107 | status = acpi_ev_install_space_handler (node, space_id, handler, setup, context); | |
108 | if (ACPI_FAILURE (status)) { | |
109 | goto unlock_and_exit; | |
110 | } | |
111 | ||
112 | /* Run all _REG methods for this address space */ | |
113 | ||
114 | status = acpi_ev_execute_reg_methods (node, space_id); | |
115 | ||
116 | unlock_and_exit: | |
117 | (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE); | |
118 | return_ACPI_STATUS (status); | |
119 | } | |
120 | EXPORT_SYMBOL(acpi_install_address_space_handler); | |
121 | ||
122 | ||
123 | /******************************************************************************* | |
124 | * | |
125 | * FUNCTION: acpi_remove_address_space_handler | |
126 | * | |
127 | * PARAMETERS: Device - Handle for the device | |
128 | * space_id - The address space ID | |
129 | * Handler - Address of the handler | |
130 | * | |
131 | * RETURN: Status | |
132 | * | |
133 | * DESCRIPTION: Remove a previously installed handler. | |
134 | * | |
135 | ******************************************************************************/ | |
136 | ||
137 | acpi_status | |
138 | acpi_remove_address_space_handler ( | |
139 | acpi_handle device, | |
140 | acpi_adr_space_type space_id, | |
141 | acpi_adr_space_handler handler) | |
142 | { | |
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; | |
148 | acpi_status status; | |
149 | ||
150 | ||
151 | ACPI_FUNCTION_TRACE ("acpi_remove_address_space_handler"); | |
152 | ||
153 | ||
154 | /* Parameter validation */ | |
155 | ||
156 | if (!device) { | |
157 | return_ACPI_STATUS (AE_BAD_PARAMETER); | |
158 | } | |
159 | ||
160 | status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE); | |
161 | if (ACPI_FAILURE (status)) { | |
162 | return_ACPI_STATUS (status); | |
163 | } | |
164 | ||
165 | /* Convert and validate the device handle */ | |
166 | ||
167 | node = acpi_ns_map_handle_to_node (device); | |
168 | if (!node) { | |
169 | status = AE_BAD_PARAMETER; | |
170 | goto unlock_and_exit; | |
171 | } | |
172 | ||
173 | /* Make sure the internal object exists */ | |
174 | ||
175 | obj_desc = acpi_ns_get_attached_object (node); | |
176 | if (!obj_desc) { | |
177 | status = AE_NOT_EXIST; | |
178 | goto unlock_and_exit; | |
179 | } | |
180 | ||
181 | /* Find the address handler the user requested */ | |
182 | ||
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 */ | |
187 | ||
188 | if (handler_obj->address_space.space_id == space_id) { | |
189 | /* Matched space_id, first dereference this in the Regions */ | |
190 | ||
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), | |
194 | node, obj_desc)); | |
195 | ||
196 | region_obj = handler_obj->address_space.region_list; | |
197 | ||
198 | /* Walk the handler's region list */ | |
199 | ||
200 | while (region_obj) { | |
201 | /* | |
202 | * First disassociate the handler from the region. | |
203 | * | |
204 | * NOTE: this doesn't mean that the region goes away | |
205 | * The region is just inaccessible as indicated to | |
206 | * the _REG method | |
207 | */ | |
208 | acpi_ev_detach_region (region_obj, TRUE); | |
209 | ||
210 | /* | |
211 | * Walk the list: Just grab the head because the | |
212 | * detach_region removed the previous head. | |
213 | */ | |
214 | region_obj = handler_obj->address_space.region_list; | |
215 | ||
216 | } | |
217 | ||
218 | /* Remove this Handler object from the list */ | |
219 | ||
220 | *last_obj_ptr = handler_obj->address_space.next; | |
221 | ||
222 | /* Now we can delete the handler object */ | |
223 | ||
224 | acpi_ut_remove_reference (handler_obj); | |
225 | goto unlock_and_exit; | |
226 | } | |
227 | ||
228 | /* Walk the linked list of handlers */ | |
229 | ||
230 | last_obj_ptr = &handler_obj->address_space.next; | |
231 | handler_obj = handler_obj->address_space.next; | |
232 | } | |
233 | ||
234 | /* The handler does not exist */ | |
235 | ||
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)); | |
239 | ||
240 | status = AE_NOT_EXIST; | |
241 | ||
242 | unlock_and_exit: | |
243 | (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE); | |
244 | return_ACPI_STATUS (status); | |
245 | } | |
246 | EXPORT_SYMBOL(acpi_remove_address_space_handler); | |
247 |