Merge branch 'release' of git://lm-sensors.org/kernel/mhoffman/hwmon-2.6
[linux-2.6] / drivers / acpi / events / evxfregn.c
1 /******************************************************************************
2  *
3  * Module Name: evxfregn - External Interfaces, ACPI Operation Regions and
4  *                         Address Spaces.
5  *
6  *****************************************************************************/
7
8 /*
9  * Copyright (C) 2000 - 2008, Intel Corp.
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)