Revert "ARM: tegra: tegratab: dummy change"
[linux-2.6.git] / drivers / acpi / acpica / 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 - 2012, 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 <linux/export.h>
46 #include <acpi/acpi.h>
47 #include "accommon.h"
48 #include "acnamesp.h"
49 #include "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  * NOTE: This function should only be called after acpi_enable_subsystem has
69  * been called. This is because any _REG methods associated with the Space ID
70  * are executed here, and these methods can only be safely executed after
71  * the default handlers have been installed and the hardware has been
72  * initialized (via acpi_enable_subsystem.)
73  *
74  ******************************************************************************/
75 acpi_status
76 acpi_install_address_space_handler(acpi_handle device,
77                                    acpi_adr_space_type space_id,
78                                    acpi_adr_space_handler handler,
79                                    acpi_adr_space_setup setup, void *context)
80 {
81         struct acpi_namespace_node *node;
82         acpi_status status;
83
84         ACPI_FUNCTION_TRACE(acpi_install_address_space_handler);
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_validate_handle(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 =
108             acpi_ev_install_space_handler(node, space_id, handler, setup,
109                                           context);
110         if (ACPI_FAILURE(status)) {
111                 goto unlock_and_exit;
112         }
113
114         /*
115          * For the default space_iDs, (the IDs for which there are default region handlers
116          * installed) Only execute the _REG methods if the global initialization _REG
117          * methods have already been run (via acpi_initialize_objects). In other words,
118          * we will defer the execution of the _REG methods for these space_iDs until
119          * execution of acpi_initialize_objects. This is done because we need the handlers
120          * for the default spaces (mem/io/pci/table) to be installed before we can run
121          * any control methods (or _REG methods). There is known BIOS code that depends
122          * on this.
123          *
124          * For all other space_iDs, we can safely execute the _REG methods immediately.
125          * This means that for IDs like embedded_controller, this function should be called
126          * only after acpi_enable_subsystem has been called.
127          */
128         switch (space_id) {
129         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
130         case ACPI_ADR_SPACE_SYSTEM_IO:
131         case ACPI_ADR_SPACE_PCI_CONFIG:
132         case ACPI_ADR_SPACE_DATA_TABLE:
133
134                 if (!acpi_gbl_reg_methods_executed) {
135
136                         /* We will defer execution of the _REG methods for this space */
137                         goto unlock_and_exit;
138                 }
139                 break;
140
141         default:
142                 break;
143         }
144
145         /* Run all _REG methods for this address space */
146
147         status = acpi_ev_execute_reg_methods(node, space_id);
148
149       unlock_and_exit:
150         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
151         return_ACPI_STATUS(status);
152 }
153
154 ACPI_EXPORT_SYMBOL(acpi_install_address_space_handler)
155
156 /*******************************************************************************
157  *
158  * FUNCTION:    acpi_remove_address_space_handler
159  *
160  * PARAMETERS:  Device          - Handle for the device
161  *              space_id        - The address space ID
162  *              Handler         - Address of the handler
163  *
164  * RETURN:      Status
165  *
166  * DESCRIPTION: Remove a previously installed handler.
167  *
168  ******************************************************************************/
169 acpi_status
170 acpi_remove_address_space_handler(acpi_handle device,
171                                   acpi_adr_space_type space_id,
172                                   acpi_adr_space_handler handler)
173 {
174         union acpi_operand_object *obj_desc;
175         union acpi_operand_object *handler_obj;
176         union acpi_operand_object *region_obj;
177         union acpi_operand_object **last_obj_ptr;
178         struct acpi_namespace_node *node;
179         acpi_status status;
180
181         ACPI_FUNCTION_TRACE(acpi_remove_address_space_handler);
182
183         /* Parameter validation */
184
185         if (!device) {
186                 return_ACPI_STATUS(AE_BAD_PARAMETER);
187         }
188
189         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
190         if (ACPI_FAILURE(status)) {
191                 return_ACPI_STATUS(status);
192         }
193
194         /* Convert and validate the device handle */
195
196         node = acpi_ns_validate_handle(device);
197         if (!node ||
198             ((node->type != ACPI_TYPE_DEVICE) &&
199              (node->type != ACPI_TYPE_PROCESSOR) &&
200              (node->type != ACPI_TYPE_THERMAL) &&
201              (node != acpi_gbl_root_node))) {
202                 status = AE_BAD_PARAMETER;
203                 goto unlock_and_exit;
204         }
205
206         /* Make sure the internal object exists */
207
208         obj_desc = acpi_ns_get_attached_object(node);
209         if (!obj_desc) {
210                 status = AE_NOT_EXIST;
211                 goto unlock_and_exit;
212         }
213
214         /* Find the address handler the user requested */
215
216         handler_obj = obj_desc->device.handler;
217         last_obj_ptr = &obj_desc->device.handler;
218         while (handler_obj) {
219
220                 /* We have a handler, see if user requested this one */
221
222                 if (handler_obj->address_space.space_id == space_id) {
223
224                         /* Handler must be the same as the installed handler */
225
226                         if (handler_obj->address_space.handler != handler) {
227                                 status = AE_BAD_PARAMETER;
228                                 goto unlock_and_exit;
229                         }
230
231                         /* Matched space_id, first dereference this in the Regions */
232
233                         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
234                                           "Removing address handler %p(%p) for region %s "
235                                           "on Device %p(%p)\n",
236                                           handler_obj, handler,
237                                           acpi_ut_get_region_name(space_id),
238                                           node, obj_desc));
239
240                         region_obj = handler_obj->address_space.region_list;
241
242                         /* Walk the handler's region list */
243
244                         while (region_obj) {
245                                 /*
246                                  * First disassociate the handler from the region.
247                                  *
248                                  * NOTE: this doesn't mean that the region goes away
249                                  * The region is just inaccessible as indicated to
250                                  * the _REG method
251                                  */
252                                 acpi_ev_detach_region(region_obj, TRUE);
253
254                                 /*
255                                  * Walk the list: Just grab the head because the
256                                  * detach_region removed the previous head.
257                                  */
258                                 region_obj =
259                                     handler_obj->address_space.region_list;
260
261                         }
262
263                         /* Remove this Handler object from the list */
264
265                         *last_obj_ptr = handler_obj->address_space.next;
266
267                         /* Now we can delete the handler object */
268
269                         acpi_ut_remove_reference(handler_obj);
270                         goto unlock_and_exit;
271                 }
272
273                 /* Walk the linked list of handlers */
274
275                 last_obj_ptr = &handler_obj->address_space.next;
276                 handler_obj = handler_obj->address_space.next;
277         }
278
279         /* The handler does not exist */
280
281         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
282                           "Unable to remove address handler %p for %s(%X), DevNode %p, obj %p\n",
283                           handler, acpi_ut_get_region_name(space_id), space_id,
284                           node, obj_desc));
285
286         status = AE_NOT_EXIST;
287
288       unlock_and_exit:
289         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
290         return_ACPI_STATUS(status);
291 }
292
293 ACPI_EXPORT_SYMBOL(acpi_remove_address_space_handler)