Merge branch 'for-jeff' of git://electric-eye.fr.zoreil.com/home/romieu/linux-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 - 2006, 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  * 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  ******************************************************************************/
69 acpi_status
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)
74 {
75         struct acpi_namespace_node *node;
76         acpi_status status;
77
78         ACPI_FUNCTION_TRACE("acpi_install_address_space_handler");
79
80         /* Parameter validation */
81
82         if (!device) {
83                 return_ACPI_STATUS(AE_BAD_PARAMETER);
84         }
85
86         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
87         if (ACPI_FAILURE(status)) {
88                 return_ACPI_STATUS(status);
89         }
90
91         /* Convert and validate the device handle */
92
93         node = acpi_ns_map_handle_to_node(device);
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
101         status =
102             acpi_ev_install_space_handler(node, space_id, handler, setup,
103                                           context);
104         if (ACPI_FAILURE(status)) {
105                 goto unlock_and_exit;
106         }
107
108         /* Run all _REG methods for this address space */
109
110         status = acpi_ev_execute_reg_methods(node, space_id);
111
112       unlock_and_exit:
113         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
114         return_ACPI_STATUS(status);
115 }
116
117 EXPORT_SYMBOL(acpi_install_address_space_handler);
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
134 acpi_remove_address_space_handler(acpi_handle device,
135                                   acpi_adr_space_type space_id,
136                                   acpi_adr_space_handler handler)
137 {
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;
144
145         ACPI_FUNCTION_TRACE("acpi_remove_address_space_handler");
146
147         /* Parameter validation */
148
149         if (!device) {
150                 return_ACPI_STATUS(AE_BAD_PARAMETER);
151         }
152
153         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
154         if (ACPI_FAILURE(status)) {
155                 return_ACPI_STATUS(status);
156         }
157
158         /* Convert and validate the device handle */
159
160         node = acpi_ns_map_handle_to_node(device);
161         if (!node) {
162                 status = AE_BAD_PARAMETER;
163                 goto unlock_and_exit;
164         }
165
166         /* Make sure the internal object exists */
167
168         obj_desc = acpi_ns_get_attached_object(node);
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) {
179                 /* We have a handler, see if user requested this one */
180
181                 if (handler_obj->address_space.space_id == space_id) {
182                         /* Matched space_id, first dereference this in the Regions */
183
184                         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
185                                           "Removing address handler %p(%p) for region %s on Device %p(%p)\n",
186                                           handler_obj, handler,
187                                           acpi_ut_get_region_name(space_id),
188                                           node, obj_desc));
189
190                         region_obj = handler_obj->address_space.region_list;
191
192                         /* Walk the handler's region list */
193
194                         while (region_obj) {
195                                 /*
196                                  * First disassociate the handler from the region.
197                                  *
198                                  * NOTE: this doesn't mean that the region goes away
199                                  * The region is just inaccessible as indicated to
200                                  * the _REG method
201                                  */
202                                 acpi_ev_detach_region(region_obj, TRUE);
203
204                                 /*
205                                  * Walk the list: Just grab the head because the
206                                  * detach_region removed the previous head.
207                                  */
208                                 region_obj =
209                                     handler_obj->address_space.region_list;
210
211                         }
212
213                         /* Remove this Handler object from the list */
214
215                         *last_obj_ptr = handler_obj->address_space.next;
216
217                         /* Now we can delete the handler object */
218
219                         acpi_ut_remove_reference(handler_obj);
220                         goto unlock_and_exit;
221                 }
222
223                 /* Walk the linked list of handlers */
224
225                 last_obj_ptr = &handler_obj->address_space.next;
226                 handler_obj = handler_obj->address_space.next;
227         }
228
229         /* The handler does not exist */
230
231         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
232                           "Unable to remove address handler %p for %s(%X), dev_node %p, obj %p\n",
233                           handler, acpi_ut_get_region_name(space_id), space_id,
234                           node, obj_desc));
235
236         status = AE_NOT_EXIST;
237
238       unlock_and_exit:
239         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
240         return_ACPI_STATUS(status);
241 }
242
243 EXPORT_SYMBOL(acpi_remove_address_space_handler);